WO2014106924A1 - Elément absorbeur de chocs pour automobile et structure de carrosserie d'automobile - Google Patents

Elément absorbeur de chocs pour automobile et structure de carrosserie d'automobile Download PDF

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Publication number
WO2014106924A1
WO2014106924A1 PCT/JP2013/083609 JP2013083609W WO2014106924A1 WO 2014106924 A1 WO2014106924 A1 WO 2014106924A1 JP 2013083609 W JP2013083609 W JP 2013083609W WO 2014106924 A1 WO2014106924 A1 WO 2014106924A1
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WO
WIPO (PCT)
Prior art keywords
fiber reinforced
reinforced resin
bumper beam
resin layer
discontinuous fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/083609
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English (en)
Japanese (ja)
Inventor
重人 安原
朋也 彌武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
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Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2014555445A priority Critical patent/JP5928929B2/ja
Publication of WO2014106924A1 publication Critical patent/WO2014106924A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • B29C43/203—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/081—Combinations of fibres of continuous or substantial length and short fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0872—Prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044—Bumpers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/721—Vibration dampening equipment, e.g. shock absorbers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
    • B60R2019/1833—Structural beams therefor, e.g. shock-absorbing made of plastic material
    • B60R2019/1853—Structural beams therefor, e.g. shock-absorbing made of plastic material of reinforced plastic material

Definitions

  • the present invention relates to a shock absorbing member for an automobile formed by laminating discontinuous fiber reinforced resin layers on both sides of a continuous fiber reinforced resin layer.
  • the present invention also relates to a vehicle body structure of an automobile combining a bumper beam made of fiber reinforced resin press-molded in the front-rear direction and a bumper beam extension made of fiber-reinforced resin press-molded in the vertical direction.
  • the continuous fibers on the outer surface thereof are oriented in two directions of the axial direction and the circumferential direction as described in Patent Document 3 below. are known.
  • the continuous fiber is disposed on the outer surface of the energy absorber, the one described in Patent Document 3 described above is inclined in a direction inclined with respect to the input direction of the collision load set in advance (the axial direction of the truncated cone).
  • the strength may be significantly reduced because continuous fibers can not support the collision load.
  • the present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a shock absorbing member for an automobile capable of effectively absorbing a collision load input from various directions.
  • a continuous fiber reinforced resin in which continuous fibers oriented in a lattice shape in a first direction and a second direction orthogonal thereto are bonded by a first thermoplastic resin.
  • the layer is constructed by laminating a discontinuous fiber reinforced resin layer in which randomly oriented discontinuous fibers are bonded with a second thermoplastic resin on both sides of the layer, and the length of the discontinuous fibers is the lattice of the continuous fibers.
  • a shock absorber for a motor vehicle is firstly characterized in that it is larger than the diagonal length.
  • a shock absorbing member for an automobile according to a second feature in which the continuous fiber reinforced resin layer has a fragile portion which partially reduces the strength. Ru.
  • the continuous fiber reinforced resin layer is composed of a plurality of layers including a layer having the fragile portion and a layer not having the fragile portion.
  • a shock absorbing member for a car is proposed.
  • the discontinuous fiber reinforced resin layer wraps all of both surfaces and ends of the continuous fiber reinforced resin layer.
  • the shock-absorbing member of the present invention is proposed.
  • the fifth thermoplastic resin may be nylon and the second thermoplastic resin may be polypropylene.
  • the shock-absorbing member of the present invention is proposed.
  • the discontinuous fiber reinforced resin layer may further include a press-formed reinforcing rib.
  • An absorbent member is proposed.
  • discontinuous fibers of the discontinuous fiber reinforced resin layer can be obtained by cutting the impact absorbing member into a predetermined length.
  • the seventh aspect of the present invention is a shock absorbing member for a motor vehicle.
  • the impact absorbing member is a bumper disposed between a vehicle body frame extending in the front-rear direction and a bumper beam extending in the vehicle width direction.
  • a beam extension wherein the bumper beam extension is composed of an upper member and a lower member having a hat-like cross section in the front-rear direction, and is formed on both ends in the vehicle width direction of the upper member and covered with the discontinuous fiber reinforced resin layer.
  • a ninth feature of the automobile is that a first reinforcing rib is integrally protruded from an end edge of a joining flange of the discontinuous fiber reinforced resin layer.
  • An impact absorbing member is proposed.
  • a second reinforcing rib extending in the front-rear direction from the discontinuous fiber reinforced resin layer covering the outer surface of the upper member and the lower member is integrated.
  • a tenth reinforcing rib is integrally formed projecting from the discontinuous fiber reinforced resin layer covering the upper surface of the upper member and the lower surface of the lower member and extending in a direction inclined with respect to the front and rear direction.
  • a shock absorbing member for an automobile according to an eleventh aspect of the present invention, characterized in that the projecting flanges are connected by the second reinforcing rib between the front and rear fastening flanges.
  • a shock absorbing member for an automobile according to a twelfth feature is characterized in that a nut for connecting the bumper beam is inserted into the front fastening flange. Ru.
  • a shock absorbing member for an automobile according to a thirteenth feature is characterized in that a tip end of the fastening flange on the front side is inclined outward in the vehicle width direction. Ru.
  • the thickness of the discontinuous fiber reinforced resin layer before press molding is t0
  • the discontinuous fiber reinforced resin layer is generally T1 ⁇ t0 ⁇ t2 where t1 is the thickness after press molding of the part and t2 is the thickness after press molding of the second reinforcing rib and the third reinforcing rib of the discontinuous fiber reinforced resin layer
  • a shock absorbing member for a motor vehicle is provided.
  • the impact absorbing member is a bumper beam extending in the vehicle width direction, and the bumper beam is made of the continuous fiber reinforced resin layer.
  • a plurality of U-shaped cross-sections formed in a U-shaped cross-section opening toward the outside in the front-rear direction are made continuous in the vertical direction, and a longitudinal rib consisting of the discontinuous fiber reinforced resin layer is placed on the U-shaped cross-section.
  • the bumper beam includes an initial load absorbing portion coupled to the front-rear direction outer side of the main body portion, and the discontinuous fiber reinforced resin layer is provided on the main body portion.
  • the initial load absorbing portion is connected to the main body by melting the head of the pin through which the pin formed in the initial load absorbing portion penetrates and forming the initial load absorbing portion; Shock absorbers for automobiles are proposed.
  • a bumper beam made of fiber reinforced resin press-molded in the front-rear direction and a bumper beam extension made of fiber-reinforced resin press-molded in the vertical direction are the shock absorbing members described in the first feature.
  • An automobile body structure connecting the bumper beam and the bumper beam extension, wherein a pin projecting inward in the front-rear direction from the bumper beam is fitted in a pin hole formed in the bumper beam extension According to a seventeenth aspect of the present invention, there is proposed an automobile body structure, characterized in that the bumper beam and the bumper beam extension are joined by thermally caulking the head of the pin.
  • the bumper beam includes a discontinuous fiber reinforced resin layer laminated at least on the inner side in the front-rear direction of the continuous fiber reinforced resin layer, the discontinuous fiber reinforced resin layer
  • An eighteenth feature of the present invention is a vehicle body structure of an automobile, wherein the pin is integrally provided.
  • the bumper beam and the bumper beam extension include a continuous fiber reinforced resin layer in which continuous fibers are oriented in two directions orthogonal to each other.
  • a vehicle body structure of an automobile is proposed.
  • the bumper beam and the bumper beam extension include a discontinuous fiber reinforced resin layer laminated on the continuous fiber reinforced resin layer, and the discontinuous fiber reinforced According to a twentieth feature of a vehicle body structure of an automobile, a reinforcing rib extending in a collision load input direction is formed on a resin layer.
  • a fastening flange made of discontinuous fiber resin in which the pin hole is formed is integrated from the front-rear direction outer end of the bumper beam extension.
  • the fastening flange has a tip end side inclined outward in the front-rear direction.
  • the front side frame front portion 14 of the embodiment corresponds to the vehicle body frame of the present invention
  • the bumper beam extension 18 and the bumper beam 19 of the embodiment correspond to the shock absorbing member of the present invention.
  • the one pin 33g corresponds to the pin of the present invention
  • the second pin 33k of the embodiment corresponds to the pin of the present invention
  • an impact-absorbing member of a motor vehicle has a first thermoplastic resin bonded with continuous fibers oriented in a lattice shape in a first direction and a second direction orthogonal thereto.
  • a discontinuous fiber reinforced resin layer in which randomly oriented discontinuous fibers are bonded with a second thermoplastic resin is laminated on both sides of the continuous fiber reinforced resin layer.
  • the impact absorbing member exhibits high strength against the collision load input in the first direction or the second direction, but when the collision load in the oblique direction is input, the lattice shape of the continuous fiber is out-of-plane deformed and breaks at the intersection Strength is reduced.
  • the grid of continuous fibers is effectively reinforced with the discontinuous fibers when an oblique collision load is input.
  • the continuous fiber reinforced resin layer has a weak portion which lowers the strength partially, the buckling strength of the impact absorbing member is locally reduced and transmitted to the vehicle body frame. It is possible to secure the impact absorption amount of the impact absorbing member by the discontinuous fiber reinforced resin layer laminated on the continuous fiber reinforced resin layer while reducing the peak load.
  • the continuous fiber reinforced resin layer is composed of a plurality of layers including the layer having the fragile portion and the layer not having the fragile portion, the influence of providing the fragile portion is minimized. Thus, the impact absorption amount of the impact absorbing member can be sufficiently secured.
  • the discontinuous fiber reinforced resin layer wraps all the both sides and ends of the continuous fiber reinforced resin layer, the continuous fiber reinforced resin layer breaks from the end in the early stage of the oblique collision. This can be avoided by reinforcing the end with a discontinuous fiber reinforced resin layer.
  • the first thermoplastic resin is nylon and the second thermoplastic resin is polypropylene. Can.
  • the discontinuous fiber reinforced resin layer is provided with a press-formed reinforcing rib, not only it is possible to easily form the reinforcing rib from discontinuous fibers having high formability,
  • the second moment of area of the shock absorbing member can be increased by the reinforcing rib to increase the strength.
  • the discontinuous fibers of the discontinuous fiber reinforced resin layer are obtained by cutting the shock absorbing member into a predetermined length, the continuous of the shock absorbing member to be discarded The fibers can be recycled as discontinuous fibers of a new impact-absorbing member.
  • the bumper beam extension disposed between the vehicle body frame extending in the front-rear direction and the bumper beam extending in the vehicle width direction has an upper member having a hat-like cross section in the front-rear direction and A discontinuous fiber reinforced resin layer formed of the lower member, formed at the both ends in the vehicle width direction of the upper member and covered with the discontinuous fiber reinforced resin layer, and formed on both ends in the vehicle width direction of the lower member
  • the laser beam welding is performed by overlapping the edge of the joint flange covered with the resin, so that the upper member and the lower member are firmly bonded without using a transparent resin having high adhesiveness to the resin of the discontinuous fiber reinforced resin layer.
  • the first reinforcing rib is integrally protruded from the edge of the joining flange of the discontinuous fiber reinforced resin layer, the first reinforcing rib can be formed of discontinuous fiber having high formability. Not only can it be molded easily, but also the cross-sectional secondary moment of the bumper beam extension can be increased by the reinforcing ribs to increase the strength.
  • the second reinforcing rib extending in the front-rear direction is integrally protruded from the discontinuous fiber reinforced resin layer covering the outer surface of the upper member and the lower member, and the upper member and the lower member
  • the third reinforcing rib extending integrally in a direction inclined with respect to the front-rear direction from the discontinuous fiber reinforced resin layer covering the inner surface of the second member, the second and third reinforcing ribs are formed of discontinuous fibers having high formability. Not only can it be molded easily, but the second moment of area of the bumper beam extension can be increased by reinforcing ribs to increase strength, and second and third reinforcing ribs extending in different directions can be input from various directions. Shock absorption effect to the collision load.
  • fastening flanges extending vertically from the front end and the rear end of the discontinuous fiber reinforced resin layer covering the outer surfaces of the upper and lower members are integrally protruded. Since the side fastening flanges are connected by the second reinforcing rib, not only the fastening flange can be easily formed by the high formability discontinuous fiber but also the bumper beam extension is firmly connected to the bumper beam and the vehicle body frame At the same time, the collision load input from the bumper beam can be efficiently transmitted to the vehicle body frame by the reinforcing rib.
  • the nut for coupling the bumper beam to the front side fastening flange is inserted, the workability at the time of coupling the bumper beam to the bumper beam extension can be enhanced.
  • the tip end of the front side fastening flange is inclined outward in the front-rear direction, the collision load input from the bumper beam can be reliably transmitted to the bumper beam extension.
  • the thickness of the discontinuous fiber reinforced resin layer before press molding is t0
  • the thickness of the general part of the discontinuous fiber reinforced resin layer after press molding is t1.
  • the discontinuous fiber is a continuous fiber reinforced resin in the thin general part It is possible not only to increase the reinforcement effect against oblique collision load by approaching the layer, but also to increase the filling rate of discontinuous fibers and effectively increase the geometrical moment of inertia in the thick second and third reinforcing ribs Can.
  • the impact absorbing member is a bumper beam extending in the vehicle width direction, and the bumper beam is formed in a U-shaped cross section in which the continuous fiber reinforced resin layer is opened outward in the front and rear direction. Since the upper wall, the lower wall, and the bottom wall of the U-shaped cross section are connected by the longitudinal ribs formed of the discontinuous fiber reinforced resin layer, the plurality of U-shaped cross sections are continuously connected in the vertical direction.
  • the U-shaped cross section is lightweight and has high bending and torsional rigidity.
  • the bumper beam includes an initial load absorbing portion coupled to the front-rear direction outer side of the main body portion, and a pin made of a discontinuous fiber reinforced resin layer is protruded on the main body portion
  • the initial load absorbing portion is joined to the main body by melting the head of the pin penetrating the pin hole formed in the load absorbing portion, so that not only can the initial load absorbing portion be easily connected to the main body, but also the bumper beam Can be closed to increase bending rigidity.
  • the bumper beam A pin projecting inward from the front and rear direction is fitted into a pin hole formed in the bumper beam extension, and the head of the pin is thermally crimped to join the bumper beam and the bumper beam extension.
  • the bumper beam and the bumper beam extension can be coupled with a simple structure without the need for various fastening members.
  • the pins are integrally formed on the bumper beam that is press-formed in the front-rear direction, the pins do not get in the way when the bumper beam is punched out, and the pins extend in the front-rear direction which is the collision load input direction. Therefore, it is possible to prevent breakage of the pin due to collision load and to make it difficult for the bumper beam and the bumper beam extension to be disconnected.
  • the bumper beam comprises a discontinuous fiber reinforced resin layer laminated at least on the inner side in the front-rear direction of the continuous fiber reinforced resin layer, and the discontinuous fiber reinforced resin layer integrally comprises pins. Therefore, in a continuous fiber reinforced resin layer with low moldability, it is possible to easily form a pin that is difficult to mold with a discontinuous fiber reinforced resin layer with high moldability, and the pin is sufficiently reinforced by discontinuous fibers.
  • the bumper beam and the bumper beam extension can be firmly fixed.
  • the bumper beam and the bumper beam extension include continuous fiber reinforced resin layers in which continuous fibers are oriented in two directions orthogonal to each other, so bending of the bumper beam and the bumper beam extension Not only the strength can be increased, but also the bumper beam and the bumper beam extension can be crushed sequentially from the tip side at the time of collision load input to improve the shock absorbing performance.
  • the bumper beam and the bumper beam extension have a discontinuous fiber reinforced resin layer laminated on a continuous fiber reinforced resin layer, and the impact load direction is applied to the discontinuous fiber reinforced resin layer Since the reinforcing rib extending to the top is formed, it is possible to easily form a reinforcing rib of complicated shape by discontinuous fiber reinforced resin with excellent formability, and the reinforcing rib increases the moment of inertia of area of bumper beam and bumper beam extension Not only can the bending strength be enhanced, but also the impact absorbing performance can be enhanced by the crushing of the reinforcing rib.
  • a fastening flange made of discontinuous fiber reinforced resin in which pin holes are formed is integrally protruded from the front and rear direction outer end of the bumper beam extension. Because it slopes outward, when a collision load is input from the bumper beam to the fastening flange of the bumper beam extension, the collision load can be efficiently received by the fastening flange. As a result, the fastening flange acts as a trigger (trigger to cause breakage) and the bumper beam extension is sequentially crushed from the tip side, and the shock absorbing performance of the bumper beam extension can be maximized.
  • FIG. 1 is a perspective view of a front portion of a car body.
  • First Embodiment FIG. 2 is a view in the direction of arrows in FIG.
  • First Embodiment FIG. 3 is a perspective view of a bumper beam.
  • First Embodiment FIG. 4 is an enlarged view of part 4 of FIG.
  • First Embodiment FIG. 5 is an enlarged view of part 5 of FIG.
  • First Embodiment 6 is a cross-sectional view taken along line 6-6 of FIG.
  • First Embodiment 7 is a cross-sectional view taken along line 7-7 of FIG.
  • First Embodiment FIG. 8 is an exploded perspective view of a bumper beam extension.
  • FIG. 9 is a view in the direction of arrows 9 (A) to 9 (D) in FIG.
  • First Embodiment FIG. 10 is an explanatory view of a method of manufacturing a bumper beam extension.
  • First Embodiment FIG. 11 is a schematic view of a cross section of a bumper beam extension.
  • First Embodiment FIG. 12 is an operation explanatory view at the time of input of an oblique load.
  • First Embodiment FIG. 13 is a schematic view showing the relationship between the lattice of continuous fibers and the length of discontinuous fibers.
  • First Embodiment FIG. 14 is an explanatory view of cutting for recycling of the shock absorbing member.
  • First Embodiment FIG. 15 is a diagram comparing the effects of the present invention and the comparative example.
  • FIG. 16 is a schematic view of a cross section of a bumper beam extension.
  • Second Embodiment FIG. 17 is a diagram corresponding to FIG.
  • Third Embodiment FIG. 18 is an explanatory view of a method of manufacturing the main body of the bumper beam.
  • Third Embodiment FIG. 19 is an operation explanatory view at the time of input of collision load.
  • the front-back direction collision load input direction
  • the left-right direction vehicle width direction
  • the up-down direction are defined based on the occupant seated in the driver's seat.
  • the vehicle body of the automobile includes a cabin 11 integrally formed in the shape of a bathtub with FRP such as GFRP (glass fiber reinforced resin), and a dash panel 12 standing from its front end
  • FRP such as GFRP (glass fiber reinforced resin)
  • GFRP glass fiber reinforced resin
  • dash panel 12 standing from its front end
  • a pair of left and right suspension support members 13 and 13 which are die-casted with an aluminum alloy are fixed to the front of the housing.
  • Suspension support members 13, 13 include damper housings 13a, 13a for supporting upper ends of suspension dampers (not shown), and front side frame rear portions 13b, 13b connected to lower portions of damper housings 13a, 13a and extending forward.
  • a pair of left and right front side frame front parts 14, 14 made of an aluminum extruded material or a steel plate pressed material is connected to the front ends of the front side frame rear parts 13b, 13b.
  • a pair of left and right FRP side members 16 and 16 are connected to front ends of the left and right FRP upper members 15 and 15 extending forward from the left and right upper portions of the dash panel 12.
  • the FRP front bulkhead 17 formed in a rectangular frame shape in a front view is fixed to the front end of the front side frame front parts 14 and 14, and the front ends of the side members 16 and 16 are on the left and right tops of the front bulkhead 17.
  • a pair of left and right FRP bumper beam extensions 18, 18 are fixed to the front ends of the front side frame front parts 14, 14, and the FRP bumper beams 19 extend in the vehicle width direction to the front ends of the bumper beam extensions 18, 18. Is fixed.
  • the front of the bumper beam 19 is covered by a bumper face 20.
  • An FRP shroud 21 formed in a rectangular frame shape in a front view is disposed at a position surrounded by the front bulkhead 17, the bumper beam 19 and the pair of left and right bumper beam extensions 18, 18.
  • cooling system parts such as an engine cooling radiator, an air conditioning condenser, and a battery cooling radiator are stacked and supported in the front-rear direction.
  • the FRP bumper beam 19 includes a rear main body portion 31 and a front initial load absorbing portion 32.
  • the main body portion 31 has a pair of U-shaped cross sections 33, 33 having an upper wall 33a, a lower wall 33b and a bottom wall 33c and opening forward, and the lower U-shaped cross section 33
  • the upper flange 33 d and the lower flange 33 e of the upper U-shaped cross section 33 are overlapped in the front-rear direction and integrally welded to form a substantially W-shaped cross section.
  • a plurality of vertical ribs 33f extending in the vertical direction and connecting the upper wall 33a, the lower wall 33b, and the bottom wall 33c are separated by a predetermined distance in the longitudinal direction of the bumper beam 19 inside the U-shaped cross section 33 It is formed.
  • a plurality of first pins 33g that project forward are formed on the upper flange 33d of the upper U-shaped cross section 33 and the lower flange 33e of the lower U-shaped cross section 33.
  • a plurality of fastening collars 34 are inserted into the bottom wall 33 c of the U-shaped cross section 33.
  • the initial load absorbing portions 32 are divided into three in the longitudinal direction of the bumper beam 19, each having substantially the same structure.
  • Each initial load absorbing portion 32 includes a flat connection wall 32a, and a plurality of longitudinal ribs 32b and a plurality of transverse ribs 32c formed on the front surface of the connection wall 32a.
  • the longitudinal ribs 32b extending in the vertical direction and the transverse ribs 32c extending in the lateral direction intersect with each other in a lattice shape.
  • Pin holes 32d to which the first pins 33g of the main body 31 can be fitted are formed at the upper edge and the lower edge of the connecting wall 32a.
  • the first pins 33g of the main body 31 are fitted to the pin holes 32d of the initial load absorbing portion 32, and the first pins 33g are melted by a vibrating tool, whereby the initial load absorbing portions 32 are fixed to the main body 31. Combined.
  • the bumper beam extension 18 is configured by vertically combining an upper member 51 and a lower member 52 having a hat-like cross section in a front view. Since the upper member 51 and the lower member 52 of the bumper beam extension 18 have a substantially plane-symmetrical structure, the structure will be described below with the upper member 51 as a representative.
  • the upper member 51 is composed of a continuous fiber reinforced resin layer 53 and discontinuous fiber reinforced resin layers 54, 54 covering the outer surface and the inner surface of the continuous fiber reinforced resin layer 53.
  • the second prepreg 59 for forming the continuous fiber reinforced resin layer 53 is a continuous fiber 61... 62 of glass fiber UD (a sheet in which continuous fibers are aligned in one direction). .. Which are laminated in three layers of 0 ° direction, 90 ° direction and 0 ° direction are used as a reinforcing material and impregnated with a thermoplastic resin (nylon 6 or nylon 66).
  • the 0 ° direction refers to a state in which the UD extends in the front-rear direction (including the vertical direction) in a state in which the bumper beam extension 18 is mounted on the vehicle body, and the 90 ° direction in a state in which the bumper beam extension 18 is mounted to the vehicle body It refers to a state in which UD extends in the vehicle width direction (including the vertical direction).
  • the length of one side of the lattice shape constituted by the continuous fibers 61 in the 0 ° direction and the continuous fibers 62 in the 90 ° direction is, for example, 5 mm.
  • the first and third prepregs 58 and 60 for molding the discontinuous fiber reinforced resin layers 54 and 54 laminated on both sides of the continuous fiber reinforced resin layer 53 are mats of discontinuous fibers 63 of glass fiber. As a reinforcing material, they are impregnated with a thermoplastic resin (polypropylene etc.).
  • the length L2 of the discontinuous fibers 63 is equal to or greater than the length L1 (for example, 7.1 mm) of the diagonal of the lattice formed by the continuous fibers 61... 62 in the 0 ° and 90 ° directions (see FIG. 8). ).
  • the lengths of the discontinuous fibers 63 vary, the length of the discontinuous fibers 63 in the present invention is defined as an average value thereof.
  • the bumper beam extension 18 to be discarded is cut into chips at intervals longer than the diagonal length L1, and the continuous fibers 61 ..., 62 ... contained therein are cut.
  • the discontinuous fibers 63 can be recycled as the discontinuous fibers 63. As a result, it is possible to contribute to cost reduction by reusing the continuous fibers 61... 62 more expensive than the discontinuous fibers 63.
  • the upper member 51 is manufactured as follows. As shown in FIG. 10A, the mold 55 for press-molding the upper member 51 of the bumper beam extension 18 has a female mold 56 having a concave cavity 56 a for molding the outer surface of the upper member 51, and the upper member 51. , And 57b are formed in the cavity 56a and the core 57a, respectively.
  • the mold 55 is opened, and the first prepreg 58 of the discontinuous fiber reinforced resin, the second prepreg 59 of the continuous fiber reinforced resin, and the third prepreg 60 of the discontinuous fiber reinforced resin are preheated on the female die 56 After being placed in a fixed state, the male mold 57 is clamped and pressure-molded, and then cooled to obtain a fiber reinforced resin product of the bumper beam extension 18.
  • FIG. 11 schematically shows a cross section of the bumper beam extension 18, and both surfaces of the central continuous fiber reinforced resin layer 53 are covered with the discontinuous fiber reinforced resin layers 54, 54.
  • weak portions 53a are formed by cutting a part thereof. It is to be noted that instead of forming the fragile portions 53a by cutting, the surface treatment for increasing the adhesive strength between the continuous fibers 61 of the continuous fiber reinforced resin layer 53 and the resin is partially nonfunctionalized to be weak The portions 53a may be formed.
  • the upper member 51 having a hat-like cross section formed as described above has a main body 51a, a front fastening flange 51b that bends upward from the front edge of the main body 51a, and a rear that bends upward from the rear edge of the main body 51a.
  • a fastening flange 51c and a pair of joining flanges 51d and 51e extending inward and outward from the vehicle width direction from both ends in the vehicle width direction of the main body 51a are provided.
  • First reinforcement ribs 51f, 51f bent upward are integrally formed at the end in the vehicle width direction of the pair of joining flanges 51d, 51e, and extend in the front-rear direction on the outer surface of the main body 51a to achieve front fastening
  • Two second reinforcing ribs 51h, 51h for connecting the flange 51b and the rear fastening flange 51c are formed, and three third reinforcing ribs 51i are provided on the inner surface of the main body 51a and intersect in three directions at intervals of 60 °. Is formed.
  • three nuts 64 are inserted into the front fastening flange 51b, and three fastening holes 51j are formed in the rear fastening flange 51c.
  • the lower member 52 has the same shape as the upper member 51 substantially in plane symmetry with the upper member 51 described above, so that the same subscript as that of each part of the upper member 51 is attached to the reference numeral 52 of the lower member 52 to overlap I omit explanation.
  • Bumper beam extensions 18 in which the joining flanges 51d, 51e of the upper member 51 and the joining flanges 52d, 52e of the lower member 52 are joined together constitute closed cylindrical sections that extend in the front-rear direction.
  • the second prepreg 59 is pressed by the cavity 56a of the female die 56 and the core 57a of the male die 57, and the upper member 51 (or the lower member 52) is formed.
  • the first prepreg 58 sandwiched by the second prepreg 59 and the cavity 56 a of the female die 56 is The first reinforcing ribs 51f, 51f, the front fastening flange 51b, the rear fastening flange 51c, and the second reinforcing ribs 51i, 51i are simultaneously formed while flowing into the grooves 56b of the cavity 56a, and the outer surface of the upper member 51
  • the thin film is laminated along the entire surface of the
  • the third prepreg 60 sandwiched by the second prepreg 59 and the core 57a of the male mold 57 flows into the groove 57b of the core 57a, and simultaneously the third reinforcing rib 51i on the inner surface of the upper member 51 While being molded, it is laminated in a thin film along the inner surface of the upper member 51.
  • All the end portions of the continuous fiber reinforced resin layer 53 are covered with the discontinuous fiber reinforced resin layers 54, 54 which wrap around from the surface of the continuous fiber reinforced resin layer 53.
  • the thickness of the first and third prepregs 58 and 60 before press molding is t0
  • the thickness of the general portion (portion covering the continuous fiber reinforced resin layer 53) after press molding is t1
  • the first reinforcing rib 51 f Assuming that the thicknesses of 51f, the second reinforcing ribs 51h and 51h, and the third reinforcing ribs 51i are t2, t1 ⁇ t0 ⁇ t2 is set (see FIG. 10B).
  • the thickness t0 is reduced and the thickness of the general part becomes t1 thinner than t0, and the first and third prepregs 58 become excessive.
  • 60 are extruded and formed, the thicknesses of the first reinforcing ribs 51f, 51f, the second reinforcing ribs 51h, 51h and the third reinforcing ribs 51i... become t2 larger than t0.
  • the inner surfaces (portions abutting on each other) of the bonding flanges 51d and 51e of the upper member 51 and the bonding flanges 52d and 52e of the lower member 52 are not covered by the discontinuous fiber reinforced resin layers 54 and 54, but are continuous fiber reinforced resin Although the layer 53 is exposed, the continuous fiber reinforced resin layer 53 is not exposed when the upper member 51 and the lower member 52 are integrally joined, so that the entire surface of the bumper beam extension is covered with the discontinuous fiber reinforced resin layers 54, 54. It will be
  • the continuous fiber reinforced resin layer 53 having a long fiber UD as a reinforcing material has relatively high strength, but because there is a limit to the amount of deformation of UD, the formability becomes low, and thin and high ribs are formed Is difficult.
  • discontinuous fiber reinforced resin layers 54 and 54 having short randomly intertwined fibers as a reinforcing material have relatively low strength, the formability becomes high because the fibers are easily deformed, and the thin and high ribs It is easy to shape etc. Therefore, by laminating the discontinuous fiber reinforced resin layers 54, 54 on the continuous fiber reinforced resin layer 53 to form the upper member 51 and the lower member 52, both the strength and the formability of the upper member 51 and the lower member 52 can be achieved. be able to.
  • the body portion 31 of the bumper beam 19 also has a structure in which the entire surface of the continuous fiber reinforced resin layer 53 is covered with the discontinuous fiber reinforced resin layers 54 and 54. It is molded in the same manner as the extension 18.
  • the upper member 51 and the lower member 52 having the above-mentioned shape are integrally joined by laser welding 18a, 18a (see FIG. 7) of their joint flanges 51d, 51e, 52d, 52e.
  • laser welding 18a, 18a (see FIG. 7) of their joint flanges 51d, 51e, 52d, 52e.
  • a mounting plate 81 made of a metal plate is welded to the front end of the front side frame front portion 14. Then, by screwing six bolts 83 passing through the rear fastening flanges 51c, 52c of the bumper beam extension 18 from the front to the weld nut 84 provided on the rear surface of the mounting plate 81, the bumper beam extension 18 and the front The bulkhead 17 is fastened to the mounting plate 81.
  • the longitudinal ribs 32b and the transverse ribs 32c of the initial load absorbing portion 32 are crushed and exhibit shock absorbing performance.
  • the main body portion 31 of the bumper beam 19 and the bumper beam extension 18 are crushed to exhibit shock absorbing performance.
  • the discontinuous fiber reinforced resin layers 54, 54 covering the surfaces of the upper member 51 and the lower member 52 to the first reinforcing ribs 51f, 51f, 52f, 52f, the second reinforcing ribs 51h, 51h, 52h, 52h and the third Since the reinforcing ribs 51i, 52i are integrally protruded, not only the reinforcing ribs can be easily formed by the discontinuous fibers 63 having high formability, but also the second moment of area of the bumper beam extension 18 The strength can be enhanced by increasing each reinforcing rib.
  • front fastening flanges 51b and 52b and rear fastening flanges 51c and 52c extending in the vertical direction are integrally projected from discontinuous fiber reinforced resin layers 54 and 54 covering the surfaces of upper member 51 and lower member 52, and front fastening is performed. Since the flanges 51b and 52b and the rear fastening flanges 51c and 52c are connected by the second reinforcing ribs 51h, 51h, 52h and 52h (see FIG. 9), the fastening flanges can be easily formed with discontinuous fibers having high formability.
  • the bumper beam extension 18 be firmly connected to the bumper beam 19 and the front side frame front part 14, but also the collision load inputted from the bumper beam 19 can be fronted by the second reinforcing ribs 51h, 51h, 52h, 52h It can be efficiently transmitted to the side frame front part 14.
  • the nuts 64 for connecting the bumper beam 19 are inserted to the front fastening flanges 51b and 52b, the workability at the time of connecting the bumper beam 19 to the bumper beam extension 18 can be enhanced. Moreover, since the front end of the front fastening flanges 51b and 52b is inclined forward (see FIG. 6), the backward collision load input from the bumper beam 19 can be reliably transmitted to the bumper beam extension 18.
  • the thickness of the discontinuous fiber reinforced resin layers 54, 54 of the upper member 51 and the lower member 52 before press forming is t0
  • the thickness of the general part of the discontinuous fiber reinforced resin layers 54, 54 after press forming is t1.
  • the first reinforcing ribs 51f, 51f, 52f, 52f of the discontinuous fiber reinforced resin layers 54, 54, the second reinforcing ribs 51h, 51h, 52h, 52h and the third reinforcing ribs 51i Since t1 ⁇ t0 ⁇ t2 when the thickness is t2, the discontinuous fibers 63 are made to approach the continuous fiber reinforced resin layer 53 in a thin general part to enhance the reinforcing effect against the collision load in the oblique direction.
  • discontinuous fibers be formed by the thick first reinforcing ribs 51f, 51f, 52f, 52f, the second reinforcing ribs 51h, 51h, 52h, 52h and the third reinforcing ribs 51i.
  • the discontinuous fibers be formed by the thick first reinforcing ribs 51f, 51f, 52f, 52f, the second reinforcing ribs 51h, 51h, 52h, 52h and the third reinforcing ribs 51i.
  • the main body 31 of the bumper beam 19 vertically connects the two U-shaped cross sections 33, 33 formed in the U-shaped cross section in which the continuous fiber reinforced resin layer 53 is opened forward. Since the upper wall 33a, the lower wall 33b and the bottom wall 33c of the U-shaped cross sections 33, 33 are connected by the longitudinal ribs 33f consisting of the continuous fiber reinforced resin layers 54, the U shape reinforced by the longitudinal ribs 33f
  • the cross-sections 33, 33 are light in weight and high in bending rigidity and torsional rigidity.
  • the bumper beam 19 has an initial load absorbing portion 32 coupled to the front side of the main body portion 31, and the first pins 33g ... made of discontinuous fiber reinforced resin layers 54, 54 are provided in the main body portion 31 so as to protrude
  • the initial load absorbing portion 32 is joined to the main body portion 31 by melting the head of the first pins 33g which penetrate the pin holes 32d of the portion 32, so that the initial load absorbing portion 32 is easily made to the main body portion 31.
  • the bumper beam 19 can be closed in cross section to increase bending stiffness.
  • the bumper beam extension 18 and the bumper beam 19 described above are continuous fibers 61 arranged in the front-rear direction (including the vertical direction), which is the input direction of the collision load, and the vehicle width direction, which is a direction orthogonal to the input direction of the collision load.
  • Continuous fibers 62 arranged in a vertical direction are arranged in a lattice, and discontinuous fibers 63 are randomly oriented on both surfaces of a continuous fiber reinforced resin layer 53 bonded with thermoplastic nylon. Since it is constituted by laminating the discontinuous fiber reinforced resin layers 54, 54 joined by thermoplastic polypropylene, it has a large strength against the collision load in the front-rear direction input parallel to the orientation direction of one continuous fiber 61. However, as shown in FIG. 12, when the collision load in the oblique direction is input, the lattice shapes of the continuous fibers 61. .
  • the length L2 of the randomly oriented discontinuous fibers 63... is made longer than the diagonal length L1 of the lattice of the continuous fibers 61.
  • Grids of continuous fibers 61 ... 62 are effectively reinforced by discontinuous fibers 63 ... to suppress out-of-plane deformation and increase the compressive fracture strength of bumper beam extension 18 and bumper beam 19 Thus, it is possible to enhance the impact absorbing effect on the collision load input from various directions.
  • the continuous fiber reinforced resin layer 53 has weak portions 53a ... which partially lowers the strength (see FIG. 11), the buckling strength of the bumper beam extension 18 and the bumper beam 19 is locally reduced to improve the front side frame. Ensuring impact absorption of bumper beam extension 18 and bumper beam 19 with discontinuous fiber reinforced resin layers 54, 54 laminated to continuous fiber reinforced resin layer 53 while reducing peak load transmitted to front part 14 it can.
  • the discontinuous fiber reinforced resin layers 54 and 54 of the bumper beam extension 18 and the bumper beam 19 wrap all the both sides and ends of the continuous fiber reinforced resin layer 53, the continuous fiber reinforced resin layer 53 ends in the early stage of the oblique collision. Breaking from the part can be avoided by reinforcing the end with the discontinuous fiber reinforced resin layer 54, 54.
  • thermoplastic resin of the inner continuous fiber reinforced resin layer 53 is nylon
  • thermoplastic resin of the outer discontinuous fiber reinforced resin layers 54, 54 is polypropylene. Can be protected.
  • the impact absorbing member comprises only the continuous fiber reinforced resin layer 53 in which the first continuous fibers 61... And the second continuous fibers 62.
  • the input direction of the collision load coincides with the direction of the first continuous fiber 61 or the second continuous fiber 62, a large strength can be obtained, but when the input direction of the collision load is oblique, it is rapid. There is a problem that the strength decreases.
  • the continuous fiber reinforced resin layer 53 having the fragile portions 53a is a single layer, but in the second embodiment, the continuous fiber reinforced resin layer having the fragile portions 53a. 53 and a continuous fiber reinforced resin layer 53 having no fragile portion 53a are laminated in two layers, and discontinuous fiber reinforced resin layers 54, 54 are laminated on the outside thereof.
  • the continuous fiber reinforced resin layers 53, 53 are composed of two layers including the layer having the fragile portions 53a and the layer not having the fragile portions 53a, the fragile portions 53a are provided.
  • the impact absorption amount of the bumper beam extension 18 and the bumper beam 19 can be sufficiently secured by minimizing the influence of the above.
  • the bumper beam 19 and the bumper beam extension 18 are connected by the bolts 85... And the nuts 64.
  • the bumper beam 19 and the bumper beam extension 18 Bonded by heat caulking.
  • the bumper beam 19 has a plurality of projecting frontwards to the upper flange 33 d of the upper U-shaped cross section 33 and the lower flange 33 e of the lower U-shaped cross section 33.
  • First pins 33g are formed.
  • three second pins 33k,... Projecting backward are formed on both end portions of the bottom wall 33c of the U-shaped cross section 33 in the vehicle width direction.
  • the front fastening flanges 51b, 52b of the bumper beam extension 18 three pin holes 51m, in the front fastening flanges 51b, 52b of the bumper beam extension 18, three pin holes 51m,.
  • the left and right six second pins 33k protruding on the rear surface of the bumper beam 19 are inserted into the pin holes 51m and 52m of the front fastening flanges 51b and 52b at the front end of the bumper beam extension 18, and the second pins By melting (thermally caulking) 33 k, the bumper beam 19 is fastened to the front ends of the bumper beam extensions 18, 18.
  • the main body 31 of the bumper beam 19 is manufactured as follows. As shown in FIG. 18A, the mold 55 for press-molding the main body 31 of the bumper beam 19 has a female mold 56 having a concave cavity 56 a for molding the outer surface of the main body 31, and the main body 31. It consists of a male mold 57 having a convex core 57a for molding the inner surface, and in the cavity 56a and the core 57a, grooves 56b,..., 57b for molding ribs and pins are formed.
  • the mold 55 is opened, and the first prepreg 58 of the discontinuous fiber reinforced resin, the second prepreg 59 of the continuous fiber reinforced resin, and the third prepreg 60 of the discontinuous fiber reinforced resin are preheated on the female die 56
  • the fiber-reinforced resin product of the main body portion 31 is obtained by arranging in the above-described state, pressing and molding the male mold 57 after clamping.
  • the main body 31 of the bumper beam 19 press-formed by the mold 55 has a continuous fiber reinforced resin layer 53 and a non-conductive surface covering the outer surface and the inner surface of the continuous fiber reinforced resin layer 53. It comprises the continuous fiber reinforced resin layers 54, 54.
  • the second prepreg 59 for forming the continuous fiber reinforced resin layer 53 is a continuous fiber 61... 62 of glass fiber UD (sheet in which continuous fibers are aligned in one direction) 0 ° direction, 90 ° direction and What was laminated
  • a thermoplastic resin nylon 6 or nylon 66
  • the 0 ° direction refers to the state in which the UD extends in the front-rear direction (including the vertical direction) in a state where the bumper beam 19 is mounted on the vehicle body, and the 90 ° direction in a state where the bumper beam 19 is mounted on the vehicle body A state of extending in the vehicle width direction (including the vertical direction).
  • the first and third prepregs 58 and 60 for molding the discontinuous fiber reinforced resin layers 54 and 54 laminated on both sides of the continuous fiber reinforced resin layer 53 are mats of discontinuous fibers 63 of glass fiber. As a reinforcing material, they are impregnated with a thermoplastic resin (polypropylene etc.).
  • Second pins 33k are integrally formed with the discontinuous fiber reinforced resin layer 54 laminated on the outer surface (rear surface).
  • the second prepreg 59 is pressed by the cavity 56 a of the female die 56 and the core 57 a of the male die 57. , And the main body 31 is formed.
  • the first and third prepregs 58 and 60 having a discontinuous fiber as a reinforcing material can be easily deformed, the first prepreg 58 sandwiched by the second prepreg 59 and the cavity 56 a of the female die 56 is While flowing into the groove 56b of the cavity 56a to simultaneously form the second pins 33k, the thin film is laminated along a part of the outer surface of the main body 311.
  • the third prepreg 60 sandwiched by the second prepreg 59 and the core 57a of the male mold 57 flows into the groove 57b of the core 57a, and the longitudinal rib 33f of the inner surface of the main body and the first pin 33g Are molded simultaneously, and are laminated in a thin film along the entire inner surface of the upper member 51.
  • the continuous fiber reinforced resin layer 53 having a long fiber UD as a reinforcing material has relatively high strength, but because there is a limit to the amount of deformation of UD, the formability becomes low, and thin and high ribs are formed Is difficult.
  • discontinuous fiber reinforced resin layers 54 and 54 having short randomly intertwined fibers as a reinforcing material have relatively low strength, the formability becomes high because the fibers are easily deformed, and the thin and high ribs It is easy to shape etc. Therefore, by laminating the discontinuous fiber reinforced resin layers 54, 54 on the continuous fiber reinforced resin layer 53 to form the body portion 31 of the bumper beam 19, both the strength and the formability of the body portion 31 of the bumper beam 19 can be achieved. be able to.
  • the bumper beam extension 18 Similar to the body portion 31 of the bumper beam 19 described above, the bumper beam extension 18 also has a structure in which the upper and lower surfaces of the continuous fiber reinforced resin layer 53 are covered with the discontinuous fiber reinforced resin layers 54 and 54. It is shaped in the same way as the body 31 of the beam 19.
  • second pins 33 k that are provided to project rearward from the bumper beam 19 are of the bumper beam extension 18. Because the bumper beam 19 and the bumper beam extension 18 are joined by fitting the pin holes 51m, 52m ... formed in the front fastening flanges 51b, 52b ..., 52m ... and melting the head of the second pins 33k ... (thermally caulking)
  • the bumper beam 19 and the bumper beam extension 18 can be coupled with a simple structure without the need for fasteners, such as bolts and nuts.
  • first pins 33g and the second pins 33k are integrally formed with the bumper beam 18 which is press-formed in the front and rear direction, the first and second pins 33g are formed when the body portion 31 of the bumper beam 19 is punched out. ..., 33k ... do not get in the way, and the first and second pins 33g ..., 33k ... extend in the front-rear direction, which is the input direction of the collision load, so the first and second pins 33g ... due to the collision load Can be prevented, and the connection between the initial load absorbing portion 32 and the bumper beam extension 18 with respect to the main body portion 31 can be made difficult to remove.
  • the main body portion 31 of the bumper beam 19 includes discontinuous fiber reinforced resin layers 54, 54 laminated on the surface of the continuous fiber reinforced resin layer 53, and the discontinuous fiber reinforced resin layers 54, 54 include the first pins 33g. Since the two pins 33k are integrally provided (see FIG. 18), the continuous fiber reinforced resin layer 53 having low formability makes the first and second pins 33g,. The first and second pins 33g,..., 33k... Can be easily molded with the resin layers 54, 54, and have sufficient strength to be reinforced with discontinuous fibers. Beam extensions 18 can be rigidly coupled.
  • the main body portion 31 of the bumper beam 19 and the bumper beam extension 18 are provided with the continuous fiber reinforced resin layer 53 in which the continuous fibers 61... 62 are oriented in two directions orthogonal to each other (see FIG. 8) Not only can the bending strength of the bumper beam extension 19 and the bumper beam extension 18 be enhanced, but also the bumper beam 19 and the bumper beam extension 18 can be crushed sequentially from the tip side upon impact load input to enhance the shock absorbing performance.
  • the body portion 31 of the bumper beam 19 is provided with the longitudinal ribs 33f extending in the input direction of the collision load in the discontinuous fiber reinforced resin layer 54, and the bumper beam extension 18 is input in the collision load in the discontinuous fiber reinforced resin layer 54 Since the first reinforcing ribs 51f, 51f, 52f, 52f and the second reinforcing ribs 51h, 51h, 52h, 52h are extended (see FIG. 9), the longitudinal shape of complex shape is made of discontinuous fiber reinforced resin having excellent formability.
  • the ribs 33f ..., the first reinforcing ribs 51f, 51f, 52f, 52f and the second reinforcing ribs 51h, 51h, 52h, 52h can be easily formed, and the longitudinal ribs 33f ..., the first reinforcing ribs 51f, 51f, 52f, 52f and the second reinforcing ribs 51h, 51h, 52h, 52h, the main body 31 of the bumper beam 19 and the Not only can increase the bending strength by increasing the second moment of the par beam extension 18, it is possible to improve the shock absorbing capacity due to their collapse.
  • the bumper beam extension 18 is provided with front fastening flanges 51b and 52b which are bent in a direction intersecting with the collision load input direction to solidify discontinuous fibers with a thermoplastic resin, Because the bumper beam 19 is connected to the fastening flanges 51b and 52b, when a collision load is input from the bumper beam 19 to the bumper beam extension 18, the front fastening flanges 51b and 52b having a large pressure receiving area trigger (trigger to cause destruction The shock absorbing performance can be enhanced by sequentially crushing the bumper beam extension 18 in the front-rear direction.
  • the bumper beam extensions and bumper beams of the present invention are not limited to those on the front side of the vehicle, but may be those on the rear side.
  • vehicle body frame of the present invention is not limited to the front side frame front portion 14 of the embodiment, but may be a frame disposed in the front and rear direction at the front or rear of the vehicle body.
  • the FRP of the present invention is not limited to the GFRP (glass fiber reinforced resin) of the embodiment, and may be another type of FRP such as a carbon fiber reinforced resin or an aramid fiber reinforced resin.
  • shock absorbing member of the present invention is not limited to the bumper beam extension 18 and the bumper beam 19 of the embodiment.
  • the two U-shaped cross sections 33, 33 are combined to constitute the main body 31 of the bumper beam 19, but the two U-shaped cross sections 33, 33 are integrally formed. It is good.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Vibration Dampers (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

Selon l'invention, des couches renforcées par des fibres non continues (54) sont stratifiées sur les deux côtés d'une couche de résine renforcée par des fibres continues (53) formée en collant des fibres continues (61, 62) disposées en motif de grille les unes aux autres à l'aide d'une première résine thermodurcissable, les couches renforcées par des fibres non continues (54) étant formées en collant des fibres non continues (63) orientées au hasard les unes aux autres à l'aide d'une seconde résine thermodurcissable. Un élément absorbeur de chocs possède une grande résistance contre une charge de choc provenant d'une première ou d'une seconde direction, et lorsqu'une charge de choc vient d'une direction diagonale, la grille de fibres continues (61, 62) subit une déformation hors-plan et les intersections des fibres continues (61, 62) se brisent, ce qui réduit leur résistance. Toutefois, en faisant en sorte que la longueur (L2) des fibres non continues (63) soit plus grande que la longueur (L1) de la ligne diagonale de chaque cellule de la grille de fibres continues (61, 62), la forme de grille des fibres continues (61, 62) peut être efficacement renforcée par les fibres non continues (63) lorsque une charge de choc provient de la direction diagonale tout en atténuant la déformation hors-plan, et il est possible d'augmenter l'effet d'absorption des chocs en augmentant la résistance de l'élément d'absorption des chocs contre les défaillances en compression.
PCT/JP2013/083609 2013-01-07 2013-12-16 Elément absorbeur de chocs pour automobile et structure de carrosserie d'automobile Ceased WO2014106924A1 (fr)

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WO2015080037A1 (fr) * 2013-11-27 2015-06-04 本田技研工業株式会社 Pare-chocs d'automobile
JP2016074269A (ja) * 2014-10-03 2016-05-12 トヨタ自動車株式会社 自動車の衝撃吸収構造
JP2016097719A (ja) * 2014-11-18 2016-05-30 本田技研工業株式会社 自動車用バンパー
JP2016097718A (ja) * 2014-11-18 2016-05-30 本田技研工業株式会社 自動車用バンパー
JP2016097717A (ja) * 2014-11-18 2016-05-30 本田技研工業株式会社 自動車用バンパー
JP2016097720A (ja) * 2014-11-18 2016-05-30 本田技研工業株式会社 自動車用バンパー
JP2018075812A (ja) * 2016-11-11 2018-05-17 本田技研工業株式会社 プリフォームの製造方法
FR3065263A1 (fr) * 2017-04-14 2018-10-19 Valeo Systemes Thermiques Dispositif absorbeur d'energie agence pour etre monte entre un pare-chocs et un longeron de vehicule automobile
CN111479724A (zh) * 2017-12-14 2020-07-31 马自达汽车株式会社 车辆的冲击吸收结构
WO2024058006A1 (fr) * 2022-09-14 2024-03-21 東洋紡エムシー株式会社 Élément d'absorption d'impact
US12502846B2 (en) 2020-09-17 2025-12-23 Mitsui Chemicals, Inc. Molded body and method for manufacturing same

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