US20040129518A1 - Impact absorbing member for vehicle - Google Patents

Impact absorbing member for vehicle Download PDF

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Publication number
US20040129518A1
US20040129518A1 US10/698,537 US69853703A US2004129518A1 US 20040129518 A1 US20040129518 A1 US 20040129518A1 US 69853703 A US69853703 A US 69853703A US 2004129518 A1 US2004129518 A1 US 2004129518A1
Authority
US
United States
Prior art keywords
resin
absorbing member
energy absorbing
recessed
thermoplastic
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.)
Abandoned
Application number
US10/698,537
Other languages
English (en)
Inventor
Teruo Tamada
Hiroo Inui
Kiyotaka Urakawa
Kenji Ishii
Tadatoshi Tanji
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.)
Kyoraku Co Ltd
Original Assignee
Kyoraku 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
Priority claimed from JP2002319160A external-priority patent/JP2004149074A/ja
Priority claimed from JP2002319162A external-priority patent/JP4229676B2/ja
Priority claimed from JP2002319163A external-priority patent/JP4181630B2/ja
Priority claimed from JP2002319161A external-priority patent/JP2004149075A/ja
Priority claimed from JP2003025258A external-priority patent/JP2004231145A/ja
Priority claimed from JP2003025256A external-priority patent/JP2004231143A/ja
Priority claimed from JP2003025255A external-priority patent/JP4220795B2/ja
Priority claimed from JP2003025254A external-priority patent/JP2004232827A/ja
Priority claimed from JP2003025257A external-priority patent/JP2004231144A/ja
Priority claimed from JP2003054856A external-priority patent/JP4181631B2/ja
Priority claimed from JP2003054858A external-priority patent/JP2004262343A/ja
Priority claimed from JP2003097349A external-priority patent/JP4271476B2/ja
Application filed by Kyoraku Co Ltd filed Critical Kyoraku Co Ltd
Assigned to KYORAKU CO., LTD. reassignment KYORAKU CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: URAKAWA, KIYOTAKA, ISHII, KENJI, INUI, HIROO, TAMADA, TERUO, TANJI, TADATOSHI
Publication of US20040129518A1 publication Critical patent/US20040129518A1/en
Priority to US11/130,616 priority Critical patent/US7306080B2/en
Abandoned 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
    • B60R21/0428—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings associated with the side doors or panels, e.g. displaced towards the occupants in case of a side collision
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/0472—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by comprising a damping device
    • F16F9/0481—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by comprising a damping device provided in an opening to the exterior atmosphere
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
    • B29C2049/4805—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by closing the mould halves
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
    • B29C49/4812—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity and welding opposite wall parts of the parisons or preforms to each other
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • 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
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • 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
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0089—Impact strength or toughness
    • 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
    • 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
    • B29L2031/3005—Body finishings
    • 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
    • B29L2031/3005—Body finishings
    • B29L2031/3008—Instrument panels
    • 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
    • B29L2031/3005—Body finishings
    • B29L2031/3011—Roof linings
    • 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
    • B29L2031/3005—Body finishings
    • B29L2031/3014—Door linings
    • 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
    • B29L2031/3005—Body finishings
    • B29L2031/302—Trim strips
    • 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
    • B29L2031/3005—Body finishings
    • B29L2031/3023—Head-rests
    • 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
    • B29L2031/3005—Body finishings
    • B29L2031/3026—Arm-rests
    • 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
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7138—Shock absorbing
    • 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
    • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • B60R2019/1866—Cellular structures
    • 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
    • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • B60R2019/188—Blow molded structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
    • B60R2021/0414—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings using energy absorbing ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
    • B60R2021/0435—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings associated with the side or roof pillars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0047—Measuring, indicating

Definitions

  • the present invention relates to an impact energy absorbing member, more particularly an energy absorbing member provided inside a vehicle structural member such as a door, a door trim, a body side panel, a roof panel, a pillar, and a bumper, for absorbing the impact energy from the inside such as the collision of a passenger against the inner wall of the vehicle structural member or the impact energy from the outside such as the collision with another vehicle.
  • a vehicle structural member such as a door, a door trim, a body side panel, a roof panel, a pillar, and a bumper
  • JP-A Japanese Patent Application Laid Open
  • JP-A No. 2002-187508 discloses a hollow double wall structure for the absorption of impact energies to vehicles such as automobiles. This structure is produced by blow molding of thermoplastics, forming recessed ribs from the front surface wall and the rear surface wall with the top end parts thereof bonded with each other so as to be integrated for improving the energy absorbing property.
  • the official gazette of Japanese Patent No. 3,313,999 discloses an energy absorbing member made of a polypropylene resin having a 5,000 kg/cm2 to 25,000 kg/cm2 flexural modulus.
  • JP-A Japanese Patent Application Laid Open
  • 2002-201322 discloses one made of a polypropylene resin composition including a polypropylene component and a copolymer component of a propylene and an ethylene.
  • a sufficient shock absorbing property can be obtained by forming an interlocking rib for integrally linking a plurality of recessed ribs, or the like as shown in the official gazette of Japanese Patent Application Laid Open (JP-A) No. 2002-187508.
  • JP-A Japanese Patent Application Laid Open
  • the stress change at the time of energy absorption at 60° C. to ⁇ 15° C. is large and the energy absorbing performance is effected by the outside air temperature. That is, with the load stress at a 50% compression distortion of a polypropylene energy absorbing member provided as the reference at an ordinary temperature, the stress change ratio is 21% in the case the outside air temperature is ⁇ 15° C., and the stress change ratio is ⁇ 34% in the case the outside air temperature is 60° C.
  • the impact absorbing member formed of a polypropylene resin having a 5,000 kg/cm2 to 25,000 kg/cm2 flexural modulus disclosed in the official gazette of Japanese Patent No. 3,313,999 can not provide the required level of performance.
  • One embodiment of the present invention provides a system for absorbing energy from an impact, that system comprising: an energy absorbing member comprising first and second opposing walls; at least one rib disposed between the first and second opposing walls energy absorbing member comprising a thermoplastic, the thermoplastic comprising a polyolefin based resin and 35-75% by weight of an amorphous resin.
  • thermoplastic has a flexural modulus of between about approximately 9,000 kg/cm 2 and about approximately 22,000 kg/cm 2
  • thermoplastic has a 15 to 40 kg/cm 2 Izod impact value at an ordinary temperature.
  • Still another embodiment of the present invention provides such a system wherein the polyolefin based resin is a polypropylene resin, and the amorphous resin is at least one resin selected from the group of resins consisting of polystyrene resin, impact resistant polystyrene resin, acrylonitrile-butadiene-styrene resin, polyphenylene ether resin, and mixtures thereof.
  • a still further embodiment of the present invention provides a system for absorbing energy from impacts, that system comprising: a blow molded energy absorbing member comprising; first and second opposing walls; at least one fused pair of first and second ribs disposed between the first and second opposing walls: the first recessed rib being integrally molded from the first wall and having a first recessed rib end; the second recessed rib is integrally molded from the second wall and having a second recessed rib end; the first and second recessed ribs being integrally fused at a welded surface disposed between the first and second recessed rib ends; the energy absorbing member comprising a thermoplastic, that thermoplastic comprising a polyolefin based resin and 35-75% by weight of an amorphous resin, and having a 15 to 40 kg/cm 2 Izod impact value at about approximately normal temperature.
  • the polyolefin based resin is a polypropylene resin
  • the amorphous resin is at least one resin selected from the group consisting of polystyrene resin, impact resistant polystyrene resin, acrylonitrile-butadiene-styrene resin, polyphenylene ether resin, and mixtures thereof.
  • An even further embodiment of the present invention provides a system for absorbing energy from an impact, that system comprising: an energy absorbing member comprising first and second opposing walls; the energy absorbing member comprising blow molded thermoplastic; at least one rib disposed between the first and second opposing walls; and the thermoplastic comprising a first resin, having a flexural modulus of not greater than about approximately 2,000 kg/cm 2 , and a polyolefin based resin.
  • Still another embodiment of the present invention provides such a system wherein the first resin has a flexural modulus not greater than 200 kg/cm 2 .
  • a still further embodiment of the present invention provides such a system wherein the first resin is at least one resin selected from the group of resins consisting of olefin based elastomers, styrene based elastomers, super low density polyethylene, straight chain-like low density polyethylene, low density polyethylene, straight chain-like super low density polyethylene and mixtures thereof.
  • the first resin is at least one resin selected from the group of resins consisting of olefin based elastomers, styrene based elastomers, super low density polyethylene, straight chain-like low density polyethylene, low density polyethylene, straight chain-like super low density polyethylene and mixtures thereof.
  • the polyolefin based resin is at least one resin selected from the group consisting of a polyethylene, a polypropylene and a mixture thereof.
  • an even still further embodiment of the present invention provides such a system wherein the first resin comprises an olefin based elastomer and the olefin based elastomer is at least one elastomer selected from the group consisting of ethylene-propylene copolymer rubber, ethylene-butene copolymer rubber, propylene-butene copolymer rubber, hydrogenation product of butadiene-styrene copolymer rubber, and mixtures thereof.
  • Yet another embodiment of the present invention provides such a system wherein the first resin is added to the polyolefin based resin in a proportion of about approximately between 3 to 20 parts by weight.
  • a yet further embodiment of the present invention provides such a system wherein the first resin to be added to the polyolefin based resin is a thermoplastics resin having a glass transition temperature not higher than about approximately ⁇ 30° C.
  • a yet even further embodiment of the present invention provides a system for absorbing energy from an impact, that system comprising: a blow molded hollow energy absorbing member comprising; first and second opposing walls; at least one fused pair of first and second ribs disposed between the first and second opposing walls; the first recessed rib is integrally molded from the first wall and having a first recessed rib end; the second recessed rib is integrally molded from the second wall and having a second recessed rib end; the first and second recessed ribs being integrally fused at a welded surface disposed between the first and second recessed rib ends; the blow molded hollow impact absorbing member comprising a polypropylene resin and about approximately 3 to 20 parts by weight of an olefin based elastomer, the olefin based elastomer having a flexural modulus of not greater than 200 kg/cm 2 and a glass transition temperature not higher than ⁇ 30° C.
  • FIG. 1 is a partially broken perspective view showing an energy absorbing member for a vehicle according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view taken on the line A-A of FIG. 1.
  • FIG. 3 is a view showing a first step for molding an energy absorbing member for a vehicle according to one embodiment of the invention by blow molding.
  • FIG. 4 is a view showing a second step for molding an energy absorbing member for a vehicle according to one embodiment of the invention by blow molding.
  • FIG. 5 is a cross-sectional view showing an embodiment with an energy absorbing member for a vehicle according to one embodiment of the invention provided inside a door trim of a vehicle.
  • FIG. 6 is a cross-sectional view showing an embodiment with an energy absorbing member for a vehicle according to one embodiment of the invention provided inside a rear pillar of a vehicle.
  • FIG. 7 is a rear view of a rear bumper with an energy absorbing member for a vehicle according to one embodiment of the invention provided therein.
  • FIG. 8 is a partially broken perspective view showing an energy absorbing member for a vehicle according to another embodiment of the present invention.
  • FIG. 9 is a graph showing the displacement with respect to the compression load of an energy absorbing member for a vehicle made of a resin with a modified PPE resin introduced to a PP resin.
  • FIG. 10 is a graph showing the displacement with respect to the compression load of an energy absorbing member for a vehicle made of a resin with an olefin based elastomer introduced to a PP resin.
  • FIG. 11 is a graph showing the displacement with respect to the compression load of an energy absorbing member for a vehicle made of a PP resin.
  • the reference numeral 1 denotes an energy absorbing member.
  • the energy absorbing member for a vehicle 1 made of a thermoplastic resin, formed integrally by blow molding, has a hollow part 2 , and a plurality of recessed ribs 5 , 6 formed, in one embodiment by denting or impressing opposing first 3 and second 4 walls such that interior surfaces of ribs 5 , 6 contact each other and meet, forming a joint 7 .
  • This joint may be welded, fused or otherwise configured so that the ribs are integrally joined.
  • the energy absorbing member is herein described, for the purposes of clarity, in the context of a vehicle.
  • vehicle is intended in its broadest possible meaning, and includes but is not limited to automobiles, trucks, aircraft, boats, ships, tankers, carts, etc.
  • helmets, riot gear, and protective panels would also be within the scope of the present invention.
  • the energy absorbing member for a vehicle 1 may have a configuration with the ribs provided by denting the first wall 3 toward the second wall 4 direction with the top end part bonded with the second wall 4 , or by denting the second wall 4 toward the first wall 3 direction with the top end part bonded with the first wall 3 as shown in FIG. 8.
  • the rib may be formed by impacting, impressing, or denting or otherwise molding the rib 5 into only one of the two walls 3 , 4 . This would produce a single rib rather than a pair of ribs.
  • An energy absorbing member for a vehicle 1 is made of thermoplastics produced by adding 35 to 75 wt % of an amorphous resin to a polyolefin based resin, having a 9,000 kg/cm2 to 22,000 kg/cm2 flexural modulus.
  • a polyolefin based resin a polypropylene resin, a polyethylene resin, an ethylene-propylene copolymer resin, or the like can be used. In one embodiment a polypropylene resin is used.
  • amorphous resin at least one resin selected from the group consisting of a polystyrene resin, an impact resistant polystyrene resin, an acrylonitrile-butadiene-styrene resin, a polyphenylene ether resin, and a mixture thereof can be used.
  • the thermoplastics for providing the energy absorbing member 1 have a 15 to 40 kg/cm2 Izod impact value at an ordinary temperature.
  • FIGS. 9 to 11 show the result of compressing the energy absorbing member for a vehicle 1 formed by blow molding and measuring displacement (change of the compression distortion) with respect to the compression loaded by a tensile tester.
  • the curves (a 1 ), (b 1 ), (c 1 ) shown in the graph of FIG. 11 show the displacement of the energy absorbing member for a vehicle 1 having a recessed rib, made of only a polypropylene resin with respect to the compression load in the environment of an ordinary or room temperature (about approximately 20° C.), ⁇ 15° C., and 60° C., respectively.
  • An ordinary temperature should be understood to mean a temperature approximately equal to ambient temperature.
  • the curves (b 1 ), (c 1 ) show the dramatically different values of the compression load at each displacement compared with the curve (a 1 ) showing the displacement with respect to the compression load at an ordinary temperature (20° C.).
  • the curve (b 1 ) shows a larger value of the compression load thereof at 10 to 50 mm displacement than that of the curve (a 1 )
  • the curve (c 1 ) shows a smaller value of the compression load thereof at 0 to 55 mm displacement than that of the curve (a 1 ).
  • the energy absorbing member formed only of a polypropylene resin has a large stress change with respect to temperature and the energy absorbing performance thereof is effected by the outside air temperature.
  • the curves (a 2 ), (b 2 ), (c 2 ) in the graph of FIG. 9 show the displacement of the energy absorbing member for a vehicle 1 having a recessed rib, made of thermoplastics produced by adding 50 wt % of a polyphenylene ether resin (modified PPE) to a polypropylene (PP) resin with respect to the compression load in the environment of an ordinary temperature (20° C.), minus 15° C., and 60° C., respectively.
  • modified PPE polyphenylene ether resin
  • PP polypropylene
  • the curves (b 2 ), (c 2 ) illustrate compression load values at each displacement which are approximately equal to those illustrated in curve (a 2 ) showing the displacement with respect to the compression load at an ordinary temperature (20° C.). That is, the curve (b 2 ) shows the substantially same value of the compression load thereof at 0 to 50 mm displacement of the energy absorbing member as that of the curve (a 2 ), and the curve (c 2 ) also shows the substantially same value of the compression load thereof at 0 to 50 mm displacement of the energy absorbing member as that of the curve (a 2 ).
  • the energy absorbing member formed from an amorphous resin such as a polyphenylene ether resin added to a polypropylene resin has a smaller stress change with respect to the temperature so that the energy absorbing performance thereof is barely effected by the outside air temperature.
  • the same effect can be obtained by using another amorphous resins such as a polystyrene resin (PS), an impact resistant polystyrene resin (HIPS), an acrylonitrile-butadiene-styrene resin (ABS), or the like.
  • PS polystyrene resin
  • HIPS impact resistant polystyrene resin
  • ABS acrylonitrile-butadiene-styrene resin
  • the Izod impact value tends to be changed significantly according to the composition ratio. Therefore, the Izod impact value should be specified in addition to the resin mixing ratio.
  • the Izod impact value for the energy absorbing member for a vehicle should be 15 to 40 kg/cm2.
  • Table 1 shows the stress change ratio (%) and the Izod impact value (kg/cm2) in the case of adding a polyphenylene ether resin (modified PPE) to a polypropylene resin (PP) with the mixing ratio changed.
  • the stress change ratio is calculated with the load stress at an ordinary temperature with a 50% compression distortion of the energy absorbing member provided as the reference.
  • the 50% compression distortion denotes the state within the energy absorbing member is deformed to the half thickness from the initial thickness by being crushed under the compression load.
  • An energy absorbing member was formed of only a polypropylene resin without adding a polyphenylene ether resin.
  • the stress change ratio with the ordinary temperature, 50% displacement provided as the reference was 21% at ⁇ 15° C., and it was ⁇ 34% at 60° C. That is, the compression load is made higher at a low temperature, and the compression load is made lower at a high temperature.
  • An energy absorbing member was formed of a thermoplastic resin produced by adding 20 wt % of a polyphenylene ether resin to a polypropylene resin. In this case, the same result as in the comparative example 1 was obtained.
  • An impact energy absorbing member was formed of a thermoplastic resin produced by adding 35 wt % of a polyphenylene ether resin to a polypropylene resin.
  • the stress change ratio was improved in particular at 60° C. by the addition of the polyphenylene ether so that the energy absorbing property change with respect to the temperature change is reduced.
  • An energy absorbing member was formed of a thermoplastic resin produced by adding 50 wt % of a polyphenylene ether resin to a polypropylene resin.
  • An energy absorbing member was formed of a thermoplastic resin produced by adding 70 wt % of a polyphenylene ether resin to a polypropylene resin.
  • An energy absorbing member for a vehicle 1 is made of thermoplastics with a soft resin having a 2,000 kg/cm2 or less, particularly preferably 200 kg/cm2 or less flexural modulus added to a polyolefin based resin.
  • a soft resin having a 2,000 kg/cm2 or less, particularly preferably 200 kg/cm2 or less flexural modulus added to a polyolefin based resin.
  • the energy absorbing member for a vehicle 1 formed by blow molding was compressed by a tensile tester, and displacement (change of the compression distortion) was measured with respect to the compression load.
  • the result is shown in FIG. 10.
  • the curve (a) in the graph of FIG. 10 shows the displacement of the energy absorbing member for a vehicle 1 having a recessed rib without addition of a soft resin, at an ordinary temperature.
  • the impact energy is sufficiently absorbed by supporting a high load without lowering the compression load even in the case the displacement of the energy absorbing member advances 15 mm.
  • the curve (c) in the graph shows the displacement at ⁇ 30° C. with respect to the compression load, of the energy absorbing member for a vehicle 1 having a recessed rib without addition of a soft resin.
  • the compression load is lowered from the 10 mm displacement of the energy absorbing member, so that a desirable energy absorbing property was not obtained. That is, according to the energy absorbing member for a vehicle 1 without addition of a soft resin, the member 1 is vulnerable to destruction resulting from stress cracks, and, as a result, at ⁇ 30° C., is unable to absorb the energy from an impact, as required.
  • the energy absorbing member for a vehicle 1 having a recessed rib formed of thermoplastics including a polyolefin based resin such as a polypropylene as the base material resin and 3 to 20 parts by weight of a soft resin such as a olefin based elastomer the temperature dependency can be restrained and damage from impact energy can be prevented or minimized, without hardening of the energy absorbing member 1 even at low temperature of ⁇ 30° C. and a desirable energy absorbing property can be obtained.
  • the soft resin to be added should have the glass transition temperature or the vulnerable temperature at ⁇ 30° C. or lower.
  • the resin having a 2,000 kg/cm2 or less flexural modulus should be added to a polyolefin based resin, it needs to have an excellent mixing property with respect to a polyolefin based resin as the base material resin.
  • An olefin based elastomer, a styrene based elastomer, a low density polyethylene, a straight chain-like low density polyethylene, a super low density polyethylene, and a straight chain-like super low density polyethylene are preferable.
  • a desired energy absorbing property can be obtained by adding 3 to 20 parts by weight of an olefin based elastomer to a polyolefin based resin as the base material resin.
  • an olefin based elastomer an ethylene-propylene copolymer rubber, an ethylene-butene copolymer rubber, a propylene-butene copolymer rubber, a hydrogenation product of a butadiene-styrene copolymer rubber, or the like can be used.
  • styrene based elastomer As a styrene based elastomer, a styrene-butadiene block copolymer, a styrene-butadiene-styrene block copolymer, a styrene-isoprene-block copolymer, a styrene-isoprene-styrene block copolymer, and a hydrogenation product thereof can be used preferably. These elastomers have a good mixing property with respect to a polyolefin based resin.
  • the energy absorbing member 1 is blow molded as shown in FIGS. 3 and 4.
  • the reference numerals 12 , 12 are a pair of split mold halves.
  • the split mold halves 12 , 12 are provided with recessed rib forming parts 13 , 13 for forming the recessed ribs 5 , 6 .
  • the reference numeral 14 denotes a parison, and 15 an extrusion head.
  • the energy absorbing member 1 is provided inside a vehicle structural member such as a door of, a door trim, a body side panel, a roof panel, a pillar, a bumper, a seat, and an instrument panel, or the like.
  • FIG. 5 shows an embodiment of providing the energy absorbing member 1 according to one embodiment of the invention inside a door trim 8 of a door 9 .
  • FIG. 6 shows an embodiment of providing the same inside a rear pillar 10 of an automobile, and
  • FIG. 7 shows an embodiment of providing the same inside a rear bumper 11 .
  • the mark A denotes a head of a passenger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Body Structure For Vehicles (AREA)
  • Vibration Dampers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
US10/698,537 2002-10-31 2003-10-31 Impact absorbing member for vehicle Abandoned US20040129518A1 (en)

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JP2002319161A JP2004149075A (ja) 2002-10-31 2002-10-31 車両用衝撃吸収体
JP2002319160A JP2004149074A (ja) 2002-10-31 2002-10-31 車両用衝撃吸収体
JP2002-319163 2002-10-31
JP2002-319162 2002-10-31
JP2002-319160 2002-10-31
JP2002319163A JP4181630B2 (ja) 2002-10-31 2002-10-31 車両用衝撃吸収体
JP2002-319161 2002-10-31
JP2002319162A JP4229676B2 (ja) 2002-10-31 2002-10-31 車両用衝撃吸収体
JP2003025256A JP2004231143A (ja) 2003-01-31 2003-01-31 車両用衝撃吸収体
JP2003-025258 2003-01-31
JP2003025258A JP2004231145A (ja) 2003-01-31 2003-01-31 車両用衝撃吸収体
JP2003025255A JP4220795B2 (ja) 2003-01-31 2003-01-31 車両用衝撃吸収体
JP2003-025254 2003-01-31
JP2003-025256 2003-01-31
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JP2003025254A JP2004232827A (ja) 2003-01-31 2003-01-31 車両用衝撃吸収体
JP2003025257A JP2004231144A (ja) 2003-01-31 2003-01-31 車両用衝撃吸収体
JP2003054856A JP4181631B2 (ja) 2003-02-28 2003-02-28 車両用衝撃吸収体
JP2003054858A JP2004262343A (ja) 2003-02-28 2003-02-28 車両用衝撃吸収体
JP2003-054857 2003-02-28
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JP2003097349A JP4271476B2 (ja) 2003-02-28 2003-03-31 車両用衝撃吸収体
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US10/698,706 Expired - Lifetime US7111713B2 (en) 2002-10-31 2003-10-31 Impact absorbing member for vehicle
US11/130,616 Expired - Lifetime US7306080B2 (en) 2002-10-31 2005-05-17 Impact absorbing member for vehicle
US11/287,984 Expired - Lifetime US7178647B2 (en) 2002-10-31 2005-11-28 Impact absorbing member for vehicle
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US11/130,616 Expired - Lifetime US7306080B2 (en) 2002-10-31 2005-05-17 Impact absorbing member for vehicle
US11/287,984 Expired - Lifetime US7178647B2 (en) 2002-10-31 2005-11-28 Impact absorbing member for vehicle
US11/430,287 Expired - Lifetime US7306081B2 (en) 2002-10-31 2006-05-08 Impact absorbing member for vehicle

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EP (2) EP1557583B1 (de)
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US20040195064A1 (en) 2004-10-07
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US7143876B2 (en) 2006-12-05
US20060076202A1 (en) 2006-04-13
US7306080B2 (en) 2007-12-11
WO2004040163A1 (ja) 2004-05-13
CA2504485C (en) 2011-03-22
AU2003257809A1 (en) 2004-05-25
US20040124572A1 (en) 2004-07-01
CA2504490C (en) 2011-05-03
ATE475031T1 (de) 2010-08-15
US7306081B2 (en) 2007-12-11
US20060220290A1 (en) 2006-10-05
EP1557582A1 (de) 2005-07-27
CA2504485A1 (en) 2004-05-13
US7178647B2 (en) 2007-02-20
WO2004040162A1 (ja) 2004-05-13
US7111713B2 (en) 2006-09-26
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EP1557583A4 (de) 2006-07-12
AU2003254829A1 (en) 2004-05-25
EP1557583B1 (de) 2010-07-21
WO2004040161A1 (ja) 2004-05-13
EP1557583A1 (de) 2005-07-27
EP1557582A4 (de) 2006-05-24
US20050230204A1 (en) 2005-10-20
ATE547647T1 (de) 2012-03-15

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