WO2012169328A1 - Rétracteur de ceinture de sécurité - Google Patents

Rétracteur de ceinture de sécurité Download PDF

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Publication number
WO2012169328A1
WO2012169328A1 PCT/JP2012/062582 JP2012062582W WO2012169328A1 WO 2012169328 A1 WO2012169328 A1 WO 2012169328A1 JP 2012062582 W JP2012062582 W JP 2012062582W WO 2012169328 A1 WO2012169328 A1 WO 2012169328A1
Authority
WO
WIPO (PCT)
Prior art keywords
webbing
side wall
hole
flange
winding drum
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/JP2012/062582
Other languages
English (en)
Japanese (ja)
Inventor
周三 江川
永在 姜
昂辰 井尻
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.)
Ashimori Industry Co Ltd
Original Assignee
Ashimori Industry 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 Ashimori Industry Co Ltd filed Critical Ashimori Industry Co Ltd
Priority to KR20147000251A priority Critical patent/KR101485924B1/ko
Publication of WO2012169328A1 publication Critical patent/WO2012169328A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/40—Belt retractors, e.g. reels self-locking in an emergency responsive only to vehicle movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R2022/3402—Retractor casings; Mounting thereof

Definitions

  • the present invention relates to a seat belt retractor for preventing webbing from being pulled out in an emergency.
  • the inner peripheral surfaces of the through holes 2d and 2e provided in the left and right side walls 2a and 2b of the frame 2 formed in a U-shape are respectively formed with mountain-shaped teeth 2f and 2g over the entire circumference.
  • a reel shaft 4 for winding the webbing 3 is disposed between the left and right side walls 2a and 2b.
  • Circular guide flange portions 4b and 4c are provided at the left and right ends of the webbing take-up portion 4a of the reel shaft 4, and arc-shaped retaining flanges 4m, 4r is provided. Further, the maximum dimension of the outer peripheral surface formed by the guide flange portions 4b and 4c and the retaining flanges 4m and 4r is set slightly smaller than the inner peripheral diameter of the tips of the teeth 2f and 2g.
  • the guide flange portions 4b and 4c including the stop flanges 4m and 4r can pass through the through holes 2d and 2e.
  • the webbing may be carried on the retaining flanges 4m and 4r as the reel shaft 4 rotates. Further, since the thickness of each of the retaining flanges 4m and 4r is thin, contact between the webbing 3 riding on the flanges 4m and 4r and the left and right side walls 2a and 2b is likely to occur, and the webbing 3 and the left and right side walls 2a and 2b , The webbing 3 may not be smoothly pulled out and rolled up.
  • the present invention has been made to solve the above-described problems, and provides a seat belt retractor that can prevent the webbing from climbing onto the flange portion of the winding drum with a simple configuration. With the goal.
  • the seatbelt retractor of the present invention has a winding drum for winding and storing a webbing, and a through hole in which the winding drum is inserted into a pair of opposite side wall portions and rotatably mounted.
  • a U-shaped housing formed in a plan view, and the winding drum has a pair of flange portions formed at both axial ends of the webbing winding portion, and one of the pair of side wall portions.
  • the side wall portion of the through hole extends along the peripheral edge portion of the through hole formed in the one side wall portion, and is continuously extended radially outward from the peripheral edge portion of the through hole so as to be recessed inward.
  • the reinforcing groove portion has a portion along the peripheral edge of the through hole in the vicinity of the flange portion in a state where the central axis of the through hole and the rotation axis of the winding drum coincide with each other.
  • the reinforcing groove formed so as to be recessed inward of one side wall portion matches the central axis of the through hole formed in the one side wall portion and the rotation axis of the winding drum.
  • the portion along the peripheral edge portion of the through hole is formed so as to be positioned in the vicinity of the flange portion.
  • the protruding portion of the reinforcing groove that protrudes inward of the one side wall is formed so as to have substantially the same height as the axial inner side surface of the flange.
  • the reinforcing groove portion extends along the peripheral edge portion of the through hole and continuously extends radially outward from the peripheral edge portion of the through hole.
  • the side edge portion of the webbing comes into contact with the protruding portion of the reinforcing groove portion protruding inward of the one side wall portion, and the flange portion. Therefore, the webbing can be smoothly pulled out and rolled in by preventing the webbing from climbing onto the flange portion of the winding drum with a simple configuration. Further, by providing the reinforcing groove portion that extends along the peripheral edge portion of the through hole and continuously extends radially outward from the peripheral edge portion of the through hole, the mechanical strength of the housing can be improved.
  • the reinforcing groove portion has a portion extending continuously outward from the peripheral edge of the through hole in the radial direction so as to extend outward from the maximum winding diameter of the webbing. It may be formed.
  • the reinforcing groove portion is formed such that a portion continuously extending radially outward from the peripheral edge portion of the through hole extends outward beyond the maximum winding diameter of the webbing.
  • the reinforcing groove portion has a portion along the peripheral edge portion of the through hole extending toward the webbing take-up portion side than the tangent to the outer peripheral surface of the flange portion in the webbing pull-out direction. You may make it form like this.
  • the reinforcing groove portion is formed so that the portion along the peripheral edge portion of the through hole extends to the webbing take-up portion side from the tangent to the webbing pull-out direction of the outer peripheral surface of the flange portion.
  • the webbing on the flange portion can be reliably prevented.
  • the through hole formed in the one side wall portion is opposed to the semicircular arc portion having a semicircular arc shape on the webbing pull-out direction side and the semicircular arc portion.
  • an enlarged portion that is formed in a U shape on the edge side of the one side wall portion may be provided continuously to the semicircular arc shape portion.
  • the seatbelt retractor includes a support member that is attached to the outside of the one side wall portion and pivotally supports one end side of the take-up drum and covers the through hole.
  • the one side wall portion side has a plurality of ribs erected along the radial direction of the flange portion in a state where one end side of the winding drum is pivotally supported, and among the plurality of ribs, The plurality of ribs facing the enlarged portion are substantially flush with the inner side surface of the one side wall portion from a position facing the outer peripheral surface of the flange portion to a position facing the peripheral edge portion of the enlarged portion. It may be formed.
  • the plurality of ribs facing the enlarged portion of the through hole face the outer peripheral surface of the flange portion. It is formed so that it may become substantially the same height as the inner surface of one side wall part from the position to the position which opposes the peripheral part of this expansion part.
  • FIG. 1 is an external perspective view of a seatbelt retractor according to the present embodiment. It is a disassembled perspective view of the seatbelt retractor.
  • FIG. 2 is a full sectional view taken along arrow X1-X1 in FIG.
  • FIG. 2 is a full sectional view taken along arrow X2-X2 in FIG.
  • It is a side view by the side of the mechanism cover unit of a housing. It is a side view by the side of the winding spring unit of a housing.
  • It is a disassembled perspective view of a winding spring unit.
  • It is a disassembled perspective view of a mechanism cover unit.
  • It is a disassembled perspective view of a vehicle acceleration sensor. It is a perspective view of a sensor holder.
  • FIG. 12 is a cross-sectional view taken along arrow X3-X3 in FIG. 11. It is a center sectional view showing a state where an inertial mass body is stationary. It is a center sectional view showing the state where the inertial mass body has moved to the tip side of the sensor lever. It is a center sectional view showing the state where the inertial mass body has moved to the shaft side of the sensor lever. It is sectional drawing which shows the state of the axial part when an inertial mass body is stationary. It is sectional drawing which shows the state of the axial part when a sensor lever rotates to the maximum rotation position. It is a disassembled perspective view of a winding drum unit.
  • FIG. 21 is a left side view of FIG. 20. It is a right view of FIG.
  • FIG. 21 is a cross-sectional view taken along arrow X5-X5 in FIG. 20.
  • FIG. 21 is a cross-sectional view taken along arrow X6-X6 in FIG. 20. It is sectional drawing explaining the insertion method in the housing of a winding drum unit.
  • FIG. 26 is a left side view of FIG. 25. It is sectional drawing explaining the insertion method in the housing of a winding drum unit. It is a left view of FIG.
  • FIG. 30 is a left side view of FIG. 29. It is operation
  • FIG. 1 is an external perspective view of a seatbelt retractor 1 according to this embodiment.
  • FIG. 2 is an exploded perspective view of the seatbelt retractor 1.
  • FIG. 3 is a full sectional view taken along line X1-X1 in FIG.
  • the seat belt retractor 1 is a device for winding up a webbing 3 of a vehicle, and includes a housing unit 5, a winding drum unit 6, a winding spring unit 7, and a mechanism. And a cover unit 8.
  • the mechanism cover unit 8 is fixed to the outside of the housing unit 5 by the integrally formed ny latches 8A so as to cover the outside of the clutch unit 9 constituting the winding drum unit 6, and cooperates with the clutch unit 9.
  • the lock mechanism 10 is configured to stop the withdrawal of the webbing 3 in response to a sudden withdrawal of the webbing 3 or a rapid acceleration change of the vehicle. (See FIG. 31).
  • the take-up spring unit 7 is fixed to the outside of the housing unit 5 by each ny latch 11A integrally formed with a spring case 11 (see FIG. 7).
  • the winding drum unit 6 in which the webbing 3 having the retaining pin 12 fixed at the end portion is inserted and wound is provided between the winding spring unit 7 fixed to the housing unit 5 and the mechanism cover unit 8. Is supported rotatably.
  • FIG. 4 is a full sectional view taken along line X2-X2 in FIG.
  • FIG. 5 is a side view of the housing on the mechanism cover unit 8 side.
  • FIG. 6 is a side view of the housing on the winding spring unit 7 side.
  • the housing unit 5 is formed with a U-shaped housing 15 in plan view, and a through hole 16 that is formed of a synthetic resin such as nylon and has a horizontally long rectangular shape in plan view from which the webbing 3 is drawn. And a horizontally long frame-shaped protector 17.
  • the housing 15 is formed in a U-shape in plan view by extending a back plate portion 18 fixed to the vehicle body and a pair of side wall portions 21 and 22 facing each other from both side edges of the back plate portion 18. These side wall portions 21 and 22 are connected to each other by a connecting member 23. In addition, an opening is formed at the center of the back plate 18 to reduce the weight and improve the efficiency of the webbing 3 attachment operation.
  • the protector 17 is formed with a wall portion 25 extending downward from a side edge portion on the back plate portion 18 side, and an engaging protrusion 26 protruding outward is formed at the lower end central portion of the wall portion 25. ing. Then, while the wall portion 25 of the protector 17 is brought into contact with the back plate portion 18 and is pushed so as to be disposed between the opposing side wall portions 21 and 22, the engaging protrusions 26 of the protector 17 are brought into contact with the back plate. The upper end edge of the opening formed in the portion 18 is elastically locked and fixed.
  • the width dimension in the longitudinal direction of the through hole 16 of the protector 17 is formed to be substantially equal to the width dimension of the webbing 3. Further, the width dimension of the through-hole 16 in the short direction is formed so as to be substantially opposed to the outer peripheral surface from the minimum winding diameter to the maximum winding diameter of the webbing 3, so that the webbing 3 can be smoothly pulled out and taken up. Can be done.
  • a circular through hole 28 is formed in the substantially central portion of the side wall portion 21 to which the mechanism cover unit 8 is attached, and the inner peripheral surface of the through hole 28 is further formed.
  • a mountain-shaped engaging tooth 28A is formed over the entire circumference.
  • the engaging teeth 28A engage with a pawl 29 which is arranged so as to be able to protrude and retract from the outer peripheral surface of the winding drum unit 6, so that the rotation of the winding drum unit 6 in the webbing pull-out direction is stopped. It is configured (see FIG. 32).
  • a reinforcing groove 31 that is recessed in a substantially semicircular cross section in the inner direction (the left side direction in FIG. 4) passes through the side wall portion 21 at the peripheral portion on the back plate portion 18 side of the through hole 28. It is formed in an arc shape so as to be concentric with the hole 28. Further, the side wall portion 21 has a predetermined outwardly outward direction (leftward direction in FIG. 2) at three corners of both corners of the upper end edge portion and the lower end edge portion almost directly below the central axis 28B of the through hole 28. Each mounting hole 32 burring-processed so that it may protrude in height (for example, about 1.5 mm in height) is penetrated and formed.
  • each ny latch 8A of the mechanism cover unit 8 is fitted in each mounting hole 32 and attached. Further, the periphery of the base end portion of each ny latch 8A comes into contact with the tip end portion of each mounting hole 32 projecting a predetermined height outward by burring, so that the tip end of each nai latch 8A attached to each mounting hole 32
  • the protruding height at which the portion protrudes from the inner surface of the side wall portion 21 can be lowered (for example, the protruding height can be lowered from about 2 mm to about 0.5 mm).
  • a substantially rectangular opening 33 is formed below the through hole 28 in the side wall portion 21 at a portion on the back plate 18 side from almost right below the central axis 28B of the through hole 28.
  • the sensor cover 35 (see FIG. 8) of the mechanism cover unit 8 is inserted into the opening 33 in a closed state.
  • the central portion of the side wall portion 22 to which the winding spring unit 7 is attached has a substantially semicircular arc shape in which the webbing pull-out direction side is centered on the central axis 28 ⁇ / b> B of the through hole 28.
  • a through-hole 38 is formed which includes an established semicircular arc-shaped portion 36 and an enlarged portion 37 that is continuous with the semicircular arc-shaped portion 36 and is opened substantially in a U-shape toward the lower edge of the side wall portion 22.
  • the inner peripheral diameter of the semicircular arc-shaped portion 36 formed in the side wall portion 22 is the inner periphery of the tip of the engaging tooth 28 ⁇ / b> A of the through hole 28 formed in the side wall portion 21. It is formed to be smaller than the diameter D1.
  • a plurality of (seven in FIG. 6) small chevron protrusions 39 are formed on the inner peripheral surface of the upper end edge of the semicircular arc-shaped portion 36 with an inner peripheral diameter of radius R1.
  • substantially U-shaped enlarged portion 37 formed on the side wall portion 22 extends downward from the lower end portions of the semicircular arc-shaped portion 36 while slightly extending outward in the left-right direction, and the lower end edge penetrates the side wall portion 21. It is opened so as to face the opening 33 formed below the hole 28.
  • the side wall portion 22 has a semicircular arc-shaped portion 36 and a peripheral portion on the back plate portion 18 side of the enlarged portion 37 in the inner direction (rightward direction in FIG. 4).
  • Reinforcing grooves 41 that are recessed in a substantially semicircular cross section are formed.
  • the reinforcing groove 41 is formed in a circular arc shape concentric with the semicircular arc portion 36 along the peripheral edge portion of the semicircular arc portion 36, and along the peripheral edge portion of the enlarged portion 37.
  • the lower end of the through hole 28 is substantially opposed to the lower end of the through hole 28.
  • the side wall portion 22 has a predetermined height (for example, rightward direction in FIG. 2) at three locations, that is, both corners of the upper end edge portion and the lower end edge portion below the reinforcing groove 41.
  • the height is about 1.5 mm.
  • Each mounting hole 42 burring so as to protrude is formed through. Then, each ny latch 11 ⁇ / b> A provided in the cover case 11 of the take-up spring unit 7 is fitted into each attachment hole 42 and attached.
  • each ny latch 11A comes into contact with the tip end portion of each mounting hole 42 projecting a predetermined height outward by burring, so that the tip end of each nai latch 11A attached to each mounting hole 42
  • the protruding height at which the portion protrudes from the inner surface of the side wall portion 22 can be reduced (for example, the protruding height can be reduced from about 2 mm to about 0.5 mm).
  • FIG. 7 is an exploded perspective view of the winding spring unit 7.
  • the take-up spring unit 7 is fixed to a spiral spring 45 and a rib 46 whose outer end 45 ⁇ / b> A is erected from the bottom surface of the inner peripheral edge.
  • a spring case 11 that houses the spiral spring 45, a spring shaft 47 to which the inner end 45B of the spiral spring 45 is coupled and the spring force is biased, and a spring seat 48 that is attached to the spring case 11 and covers the spiral spring 45 It is composed of
  • the spring shaft 47 has a pin 49 erected at a substantially central position of the bottom surface of the spring case 11 inserted into a through hole 47A in the bottom surface so that the bottom surface is rotatably supported. Further, the end of the spring shaft 47 on the spring seat 48 side rotates to a stepped portion having a circular cross section formed around the base end of a substantially cylindrical boss portion 48A provided at the center of the spring seat 48. Supported as possible.
  • the spring seat 48 is fixed by elastically locking the locking projections 48B provided at three locations on the outer peripheral portion to the locking holes 11B provided at the open side peripheral edge of the spring case 11. Yes.
  • the spring side shaft 51 of the winding drum unit 6 is rotatably supported by being inserted into a substantially cylindrical boss portion 48A provided at the center portion of the spring seat 48, and has an H-shaped cross section.
  • the tip portion formed in a shape is fitted into a cylinder formed in a H-shaped section of the spring shaft 47 and is connected to the spring shaft 47 so as not to be relatively rotatable.
  • the biasing force of the spiral spring 45 is always biased to the winding drum unit 6 via the spring shaft 47 so as to rotate in the winding direction of the webbing 3.
  • a ring-shaped rib 52 is provided on the surface of the spring seat 48 on the side wall 22 side so as to cover the outer peripheral portion of the end edge portion of the winding drum unit 6, and radially outward from the outer peripheral surface of the rib 52.
  • a plurality of reinforcing ribs 53 are provided up to the outer peripheral portion radially.
  • the upper end portion of each reinforcing rib 53 facing the enlarged portion 37 formed on the side wall portion 22 of the housing 15 is arranged from the outer peripheral surface of the rib 52 to the inner peripheral surface of the enlarged portion 37.
  • a positioning portion 53A is formed so as to protrude at a height substantially equal to the thickness of the side wall portion 22 up to a position opposite to.
  • a cylindrical positioning boss 54 is erected on the outer side of the rib 52 of the spring seat 48.
  • the winding spring unit 7 is inserted into each of the ny latches while the positioning boss 54 is fitted into the positioning hole 56 (see FIG. 6) formed in the peripheral edge portion of the semicircular arc-shaped portion 36 of the side wall portion 22 on the connecting member 23 side.
  • the positioning portions 53A of the respective reinforcing ribs 53 have substantially the same height as the inner side surface of the side wall portion 22.
  • FIG. 8 is an exploded perspective view of the mechanism cover unit 8.
  • the mechanism cover unit 8 includes a mechanism cover 58 attached to the outside of the side wall portion 21 of the housing 15 so as to cover the clutch unit 9 by each ny latch 8 ⁇ / b> A, It is comprised from the vehicle acceleration sensor 61 as an emergency lock starting device accommodated in the sensor accommodating part 59.
  • the mechanism cover 58 is provided with an annular rib portion 62 erected on the inner surface facing the clutch unit 9 coaxially with the central axis 28B of the through hole 28 of the side wall portion 21, and the inner peripheral surface of the rib portion 62.
  • a lock gear 66 that engages with an engagement claw 65 of the lock arm 63 is formed (see FIG. 31).
  • the lock gear 66 is configured to engage with the engagement claw 65 of the lock arm 63 only when the clutch unit 9 rotates in the webbing pull-out direction as described later (see FIG. 31).
  • a substantially cylindrical support boss 67 is erected at the center of the annular rib portion 62.
  • a tip end portion of the mechanism side shaft 68 of the take-up drum unit 6 is fitted to the support boss 67 through a bearing cap 71 so as to be slidably rotatable.
  • the sensor accommodating part 59 is formed in the concave shape of a substantially square cross section, and a pair of locking holes 72 formed on the back side of the both side walls are formed.
  • the locking claws 75 of the sensor cover 35 are attached to the upper end of the sensor housing portion 59.
  • the mechanism cover unit 8 is configured by being fitted and locked in the provided locking hole 76.
  • an opening 77 communicating with the sensor housing portion 59 is formed below the annular rib portion 62.
  • FIG. 9 is an exploded perspective view of the vehicle acceleration sensor 61.
  • FIG. 10 is a perspective view of the sensor holder 82 of FIG. 9 as viewed from the back side.
  • FIG. 11 is a front view of the sensor lever 85 as viewed from the side where it is attached to the sensor holder 82.
  • 12 is a cross-sectional view taken along arrow X3-X3 in FIG.
  • FIGS. 13 to 17 are explanatory views for explaining the operation state of the sensor lever 85 that swings up and down by the movement of the inertial mass body 83.
  • the vehicle acceleration sensor 61 includes a resin-made sensor holder 82 having a substantially box shape opened on the top surface and a mortar-shaped mounting portion 81 formed on the bottom surface, and steel or the like.
  • An inertia mass body 83 formed in a spherical shape with metal and movably placed on the placement portion 81, and a resin that is disposed above the inertia mass body 83 and supported by the sensor holder 82 so as to be swingable.
  • Sensor lever 85 is provided in a resin-made sensor holder 82 having a substantially box shape opened on the top surface and a mortar-shaped mounting portion 81 formed on the bottom surface, and steel or the like.
  • An inertia mass body 83 formed in a spherical shape with metal and movably placed on the placement portion 81, and a resin that is disposed above the inertia mass body 83 and supported by the sensor holder 82 so as to be swingable.
  • Sensor lever 85 is provided in a resin
  • the shaft portions 86 and 87 are provided on the same axial center in the outward direction from both side surface portions of one end portion in the longitudinal direction. .
  • the outer diameter of the shaft portion 86 located on the back side of the sensor housing portion 59 is slightly thicker than the shaft portion 87 located on the sensor cover 35 side. It is formed to become.
  • the base end portion of the shaft portion 86 has a protruding portion formed in a rectangular shape with a predetermined axial thickness (for example, a thickness of about 0.7 mm to 1.0 mm) having a substantially axial diameter width in front view. 88 protrudes upward.
  • a pair of support wall portions 91 and 92 are provided upward at one end of each of the side wall portions 82A and 82B facing the shaft portions 86 and 87 of the sensor holder 82, respectively. Is provided so as to protrude. Further, support holes 91A and 92A are formed above the support wall portions 91 and 92 so as to penetrate in the thickness direction with an inner diameter substantially equal to the diameter of the shaft portions 86 and 87, respectively.
  • a rotation stopper portion that is notched with a width that is substantially equal to the inner diameter of the support hole 91A from the center to the upper end of the support hole 91A and a depth that is substantially equal to the thickness of the protruding portion 88.
  • a notch groove 93 is formed on the inner side surface of the support wall portion 91.
  • the inner wall of the cutout groove 93 on the mounting portion 81 side is formed so as to incline in an obliquely outward direction (upper right direction in FIG. 10) from the outer peripheral portion to the upper end of the support hole 91A.
  • the shaft portions 86 and 87 of the sensor lever 85 are fitted into the support holes 91A and 92A from above, whereby the sensor lever 85. Is supported rotatably in the vertical direction. Further, as will be described later, the protrusion 88 formed at the base end portion of the shaft portion 86 is loosely fitted into a notch groove 93 formed upward from the support hole 91 ⁇ / b> A so that the maximum upward of the sensor lever 85 is achieved.
  • the rotation angle is regulated (see FIG. 17).
  • the sensor lever 85 has a predetermined thickness over the entire width in the width direction (in FIG. 11, the left-right direction) from one edge in the longitudinal direction to the lower side.
  • an extension portion 95 extending to the lower side of the shaft portions 86 and 87 is formed (for example, the thickness is about 2 mm).
  • the lower end portion of the extending portion 95 has a width that is about 1/3 of the entire width of the extending portion 95 in the rotation axis direction from the inner corner portion on the shaft portion 87 side, and
  • An abutment lever 96 having a rectangular cross section extending further downward with a thickness of about half the thickness is provided.
  • the contact lever 96 may be extended downward from the inner corner of the lower end portion of the extending portion 95 on the shaft portion 86 side.
  • the sensor holder 82 extends further upward from the upper end of the side wall portion.
  • a protruding regulation wall 97 is provided.
  • the upper end of the restriction wall portion 97 is formed so as to be located slightly below the lower end portion of the extension portion 95 of the sensor lever 85 pivotally supported by the support wall portions 91 and 92. Then, the lower end portion of the contact lever 96 contacts the inner side surface of the restriction wall portion 97, and the downward rotation range of the sensor lever 85 is restricted.
  • the extension portion 95 and the contact lever 96 function as a contact portion.
  • the sensor lever 85 is provided with a bowl-shaped cover portion 98 that covers the upper side of the inertia mass body 83.
  • a lock claw 99 protruding in an obliquely upward direction is provided on the upper surface of the cover portion 98 opposite to the extending portion 95.
  • the inertia mass body 83 placed on the placement portion 81 and the inner wall surface of the sensor holder 82 surrounding the circumference thereof are appropriately formed with a gap over the entire circumference in the circumferential direction.
  • the inertia mass body 83 is configured to move on the mounting portion 81 and be movable within the gap.
  • a contact portion 98A that is recessed in a bowl shape is formed so as to face the outer surface portion of the stationary inertia mass body 83. Then, the inertia mass body 83 moves on the mounting portion 81, contacts the contact portion 98 ⁇ / b> A that is recessed in a bowl shape on the lower surface side of the cover portion 98, and pushes upward so that the sensor lever 85 moves upward. It is rotated.
  • a communication hole 101 communicating with the lower surface is formed at the center of the mounting portion 81.
  • the vertical rotation range of the sensor lever 85 will be described with reference to FIGS.
  • the sensor lever 85 rotates downward by its own weight, and the lower end portion of the contact lever 96. Is in contact with the inner side surface of the restriction wall 97, and the rotational range of the sensor lever 85 in the lower direction is restricted.
  • a gap 102 of a predetermined distance (for example, a gap of a distance of about 0.5 mm) is formed between the contact portion 98A that is recessed in a bowl shape on the lower surface side of the cover portion 98 and the inertia mass body 83. ing.
  • a narrow gap is formed between the protruding portion 88 formed at the base end portion of the shaft portion 86 and the inner wall surface on the mounting portion 81 side of the notch groove 93 of the support wall portion 91. Therefore, when the fluctuation of the acceleration of the vehicle is within a fluctuation range where the inertial mass body 83 does not contact the contact portion 98A of the sensor lever 85, the contact of the sensor lever 85 even if the sensor lever 85 swings in the vertical direction. Contact between the portion 98A and the inertia mass body 83 can be prevented.
  • the inertia mass body 83 moves on the mounting portion 81 and contacts and presses the contact portion 98A on the lower surface side of the cover portion 98.
  • the position where the sensor lever 85 rotates upward is the position where the lock claw 99 comes into contact with the clutch gear 112 (see FIG. 31) of the locking clutch 106 constituting the clutch unit 9 described later.
  • the maximum rotation position of the sensor lever 85 in the upward direction is set above the position where the lock pawl 99 contacts the clutch gear 112.
  • the maximum rotation position of the sensor lever 85 in the upward direction is such that the protruding portion 88 formed at the base end portion of the shaft portion 86 is relative to the placement portion 81 of the notch groove 93 of the support wall portion 91. It is set by contacting the inner wall surface on the opposite side and restricting the rotation range of the sensor lever 85 in the upward direction.
  • the gap 103 between the sensor lever 85 and the peripheral wall portion of the sensor holder 82 when the sensor lever 85 reaches the maximum rotational position in the upper direction is set to be smaller than the diameter of the inertia mass body 83. It is configured. Further, the lower end portion of the contact lever 96 of the sensor lever 85 is separated from the inner surface of the restriction wall portion 97 and is rotated toward the placement portion 81 side. The lower end portion of the contact lever 96 and the bottom surface portion of the sensor holder 82 are configured not to contact each other, and the sensor lever 85 is configured to smoothly rotate in the vertical direction.
  • FIG. 18 is an exploded perspective view of the winding drum unit 6.
  • FIG. 19 is an exploded perspective view of the clutch unit 9.
  • the winding drum unit 6 includes a winding drum 105 around which the webbing 3 is wound, and a through hole 28 formed in the side wall portion 21 of the housing 15.
  • the pawl 29 is engaged with the tooth 28 ⁇ / b> A, the clutch unit 9, and the bearing cap 71.
  • the clutch unit 9 includes a locking clutch 106, a lock arm 63, a sensor spring 107, and a return spring 108.
  • the locking clutch 106 is erected in an annular shape from the entire circumference of the disk-shaped bottom surface portion 111 having a diameter larger than the outer diameter of the annular rib portion 62 of the mechanism cover 58 to the mechanism cover 58 side.
  • a clutch gear 112 that engages with the lock claw 99 of the sensor lever 85 of the vehicle acceleration sensor 61 is formed.
  • the clutch gear 112 is formed to engage with the lock claw 99 of the sensor lever 85 only when the locking clutch 106 rotates in the webbing pull-out direction (see FIG. 31).
  • a substantially cylindrical boss 113 is erected on the surface on the mechanism cover 58 side at the center of the bottom surface portion 111 of the locking clutch 106 and communicates with the winding drum 105 side.
  • a pivot shaft 115 is erected on the bottom surface portion 111 of the locking clutch 106 adjacent to the boss 113 at substantially the same height as the clutch gear 112.
  • the synthetic resin lock arm 63 formed in a substantially arcuate shape so as to surround the boss 113 has a pivot shaft 115 in a through hole 116 formed in an end edge portion on the boss 113 side at a substantially central portion in the longitudinal direction. Inserted and pivotally supported.
  • the bottom surface portion 111 of the locking clutch 106 is provided with a spring support pin 117 projecting from a rib portion extending radially outward from the outer peripheral surface of the boss 113. Then, one end side of the sensor spring 107 is fitted into the spring support pin 117, and the other end side of the sensor spring 107 is placed in a recess 118 formed on the end portion of the lock arm 63 opposite to the engaging claw 65. Fit.
  • the lock arm 63 is biased with a predetermined load so as to rotate in the webbing pull-out direction side with respect to the axis of the pivot shaft 115, and an end edge portion on the side opposite to the engagement claw 65 is applied to the bottom surface portion 111. It is in contact with a standing stopper 119.
  • the outer edge of the engagement claw 65 is The locking clutch 106 is configured to be able to come into contact with a rotation stop 121 having a substantially triangular cross section standing on the bottom surface portion 111 of the locking clutch 106 (see FIG. 31).
  • an interlocking pin 122 projecting from a side surface portion on the engaging claw 29A side of the pawl 29 is slidably fitted on the radially outer side of the spring support pin 117.
  • An elongated protruding guide groove 123 is formed.
  • the protruding guide groove 123 is formed so that the edge portion on the webbing pull-out direction side is gradually separated from the center of the bottom surface portion 111.
  • a spring mounting portion 125 (see FIG. 3) in which a recess into which one end side of the return spring 108 is fitted is formed on the bottom surface portion 111 of the locking clutch 106 on the winding drum 105 side. Projected to. Therefore, as shown in FIG. 18, the clutch unit 9 has the boss 113 fitted into the base end portion of the mechanism side shaft 68 with the one end side of the return spring 108 fitted into the spring mounting portion 125 and the pawl 29. The interlocking pin 122 is inserted into the protruding guide groove 123.
  • the return spring 108 and the spring mounting portion 125 are arranged in a horizontally long fitting recess 126 formed on the end surface of the winding drum 105 with the return spring 108 contracted.
  • a bearing cap 71 is fitted into a spline formed at the tip of the mechanism-side shaft 68 protruding from the boss 113 of the clutch unit 9 so as to be relatively non-rotatable.
  • the clutch unit 9 is pushed by the return spring 108 in the webbing pull-out direction side and is rotated along with the take-up drum 105 while the pawl 29 is drawn into the take-up drum 105.
  • FIG. 20 is a front view of the pawl 29 inserted into the winding drum 105.
  • FIG. 21 is a left side view of FIG.
  • FIG. 22 is a right side view of FIG. 23 is a cross-sectional view taken along arrow X5-X5 in FIG. 24 is a cross-sectional view taken along arrow X6-X6 in FIG.
  • the winding drum 105 formed of an aluminum material or the like is provided with a webbing winding part 131 at the center in the axial direction, and the webbing winding part 131 has webbing 3 at both ends.
  • a mechanism side flange portion 132 on the mechanism cover unit 8 side that guides winding and drawing and a winding spring side flange portion 133 on the winding spring unit 7 side are provided.
  • the mechanism side shaft 68 is erected at the center position of the axially outer end surface of the mechanism side flange portion 132, and the spring side shaft 51 is erected at the center position of the axially outer end surface of the winding spring side flange portion 133. Yes.
  • the webbing take-up portion 131 has a slit 135 through which the webbing 3 is inserted, which rotates across the entire width between the mechanism side flange portion 132 and the take-up spring side flange portion 133. It is opened in the radial direction including the shaft. Further, the insertion opening 136 for inserting the webbing 3 of the slit 135 is enlarged symmetrically in the circumferential direction so that the retaining pin 12 can be placed, and the webbing 3 wound around the retaining pin 12 is the webbing take-up portion 131. It is comprised so that it may be located inside the webbing winding surface.
  • the mechanism side flange portion 132 and the winding spring side flange portion 133 are coaxial with the rotation center of the webbing winding portion 131 and are formed in a circle having substantially the same size. Further, as shown in FIG. 23, the outer diameter D2 of each of the mechanism side flange portion 132 and the take-up spring side flange portion 133 is determined by the engagement teeth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21. It is set to be slightly smaller than the inner peripheral diameter D1 of the tip.
  • the mechanism side flange 132 has a pawl 29 that protrudes inward and outward from the outer periphery on the radially opposite side of the fitting recess 126 in which the return spring 108 is accommodated.
  • a substantially bow-shaped pawl housing recess 137 is formed to accommodate it.
  • the pawl housing recess 137 is formed so as to have a depth substantially the same as the thickness of the pawl 29, and the outer side in the axial direction of the pawl 29 on the outlet side is covered with a pawl guiding flange 138.
  • a guide groove 139 into which an interlocking pin 122 erected on the side surface of the pawl 29 is slidably inserted is provided at the end edge of the pawl guide flange 138 on the webbing take-up direction side. Notched in the direction.
  • the interlocking pin 122 protruding from the guide groove 139 is slidably fitted into the protruding guide groove 123 of the locking clutch 106.
  • edge on the outer side in the axial direction of the mechanism side flange 132 extends radially outward from the outer peripheral surface excluding the pawl outlet side opening portion of the pawl receiving recess 137, and functions as an example of a flange.
  • a retaining flange 141 having a substantially C shape in front view is provided. Further, as shown in FIG. 21, the outer diameter D3 of the retaining flange 141 is larger than the inner peripheral diameter D1 of the front end of the engaging tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21.
  • the retaining flange 141 has an inner peripheral diameter at the tip of the engaging tooth 28A adjacent in the axial direction. It protrudes radially outward from D1.
  • edge of the mechanism side flange portion 132 on the webbing take-up portion 131 side is from the peripheral portion including the opening portion on the pawl exit side of the pawl receiving recess 137, that is, the relationship between the pawl 29 and the engaging teeth 28A.
  • a protruding flange 142 that protrudes in a substantially arc shape in the protruding movement direction of the pawl 29 and functions as an example of a protruding portion is provided from the peripheral portion facing the mating portion.
  • the side surface of the projecting flange 142 on the side of the pawl 29 and the bottom surface portion of the pawl housing recess 137 are formed so as to be located on the same plane, and the side surface portion of the pawl 29 is configured to smoothly slide and move. .
  • the maximum external dimension D4 formed by the projecting flange 142 and the mechanism side flange portion 132 is the tip of the engaging tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21. It is set to be larger than the inner peripheral diameter D1. Therefore, in a state where the rotation axis of the winding drum 105 and the central axis 28B of the through hole 28 of the side wall portion 21 coincide with each other, the protruding flange 142 is smaller than the inner peripheral diameter D1 of the tip of the engaging tooth 28A adjacent to the outside in the axial direction. Also protrudes radially outward.
  • the axially outer side surface of the projecting flange 142 is pawled outward in the axial direction at a portion on both sides in the circumferential direction from the pawl outlet side opening portion of the pawl receiving recess 137.
  • step-difference part 143 which protrudes by the height (for example, height is about 1 mm) lower than the thickness of 29 is provided (refer FIG. 18).
  • Each inner stepped portion 143 has an inner peripheral diameter D1 at the tip of the engaging tooth 28A adjacent to the outside in the axial direction in a state where the rotation axis of the winding drum 105 and the central shaft 28B of the through hole 28 of the side wall portion 21 coincide.
  • the protrusion flange 142 is provided at both end edges in the circumferential direction so as to protrude outward in the radial direction.
  • the axially inner side surface of the retaining flange 141 is located on the outer side in the circumferential direction of the pawl outlet side of the pawl housing recess 137 at a portion facing each inner step 143 in the axial direction.
  • Each outer stepped portion 145 that protrudes inwardly at a height lower than the thickness of the pawl 29 (for example, about 1 mm in height) is provided (see FIG. 18). Accordingly, as shown in FIGS. 20 and 23, the pawl 29 moves between the inner step portions 143 and between the outer step portions 145 and is formed on the inner peripheral surface of the through hole 28. It moves to the engaging position where it engages with the tooth 28A (see FIG. 32).
  • a substantially annular rib portion 146 is provided on the axially outer end surface of the take-up spring side flange portion 133 having the outer diameter D ⁇ b> 2.
  • the shaft is erected coaxially so as to reach the outer side in the axial direction than the side wall portion 22.
  • the outer diameter D5 of the substantially annular rib portion 146 is smaller than the inner peripheral diameter of the radius R1 of the tip of the chevron 39 formed on the inner peripheral surface of the semicircular arc-shaped portion 36 of the side wall portion 22. It is set (see FIG. 29).
  • annular outer flange that functions as an example of the other side flange portion that extends radially outward from the outer peripheral surface of the axially outer edge of the annular rib portion 146 over the entire circumference. 147 is provided. Further, the outer diameter D6 of the outer flange 147 is larger than the inner peripheral diameter of the radius R1 of the tip of the chevron projection 39 formed on the inner peripheral surface of the semicircular arc-shaped portion 36 of the side wall portion 22, and the semicircular arc-shaped portion It is set to be approximately the same as the inner peripheral diameter of 36.
  • the outer flange 147 is located inside the semicircular arc-shaped portion 36 adjacent to the inner side in the axial direction. It protrudes radially outward from the inner peripheral diameter of the radius R1 at the tip of the chevron 39 formed on the peripheral surface (see FIG. 29). As will be described later, the outer flange 147 can enter the enlarged portion 37 of the side wall portion 22 (see FIG. 27).
  • FIGS. 25 to 30 are explanatory views for explaining a method of inserting the take-up drum unit 6 into the housing 15.
  • the winding drum unit 6 is arranged so that the substantially central portion in the circumferential direction of the projecting flange 142 formed on the mechanism side flange portion 132 of the winding drum 105 is positioned on the upper side in the vertical direction.
  • the clutch unit 9 is gripped.
  • the winding spring side flange portion 133 is formed on the side wall portion 21 of the housing 15 in a state where the winding drum unit 6 is tilted so that the winding spring side flange portion 133 is below the mechanism side flange portion 132.
  • the protruding flange 142 is inserted into the housing 15 from the through hole 28 through the through hole 28. Further, the spring side shaft 51 of the winding drum 105 slightly protrudes outward from the enlarged portion 37 of the through hole 38 formed in the side wall portion 22.
  • the winding drum unit 6 is slightly moved in a state where the winding drum unit 6 is inclined so that the winding spring side flange portion 133 is below the mechanism side flange portion 132.
  • the mechanism side flange portion 132 is inserted into the housing 15 by being inserted into the through hole 28 of the side wall portion 21 while being lifted upward. Further, the upper peripheral edge of the retaining flange 141 provided at the end edge on the axially outer side of the mechanism side flange 132 is brought into contact with the outer surface of the side wall 21.
  • the outer flange 147 and the take-up spring side flange portion 133 of the take-up drum 105 are inclined in the downward direction, and the semicircular arc-shaped portion 36 and the enlarged portion 37 of the through hole 38 formed in the side wall portion 22. It is inserted into the continuous part. For this reason, the upper peripheral edge of the outer flange 147 protrudes outward from the semicircular arc portion 36 of the side wall 22.
  • the outer flange 147 and the winding spring side flange 133 of the winding drum 105 are lifted upward so that the winding drum 105 is substantially horizontal, and the winding drum 105
  • the rotation shaft 105A and the central axis 28B of the through hole 28 in the side wall portion 21 are made to coincide with each other. That is, as shown in FIG. 3, the mechanism side shaft 68 of the winding drum unit 6 is pivotally supported by the mechanism cover unit 8, and the spring side shaft 51 of the winding drum unit 6 is pivotally supported by the winding spring unit 7.
  • the protruding flange 142 provided on the mechanism side flange portion 132 protrudes outside the inner peripheral diameter D1 of the front end of the engaging tooth 28A provided on the inner peripheral surface of the through hole 28 of the side wall portion 21.
  • the mechanism side flange portion 132 is positioned inside the inner peripheral diameter D1 at the tip of the engaging tooth 28A.
  • the outer peripheral edge portion of the mechanism side flange portion 132 in the radial direction of the retaining flange 141 protrudes outside the inner peripheral diameter D1 of the tip of the engagement tooth 28A provided on the inner peripheral surface of the through hole 28. .
  • each inner stepped portion 143 provided on the axially outer side surface of the projecting flange 142 and each outer stepped portion 145 provided on the axially inner side surface of the retaining flange 141 are adjacent to the engagement teeth. It protrudes outside the inner peripheral diameter D1 of the tip of 28. Further, the winding spring side flange portion 133 and the outer flange 147 are larger than the inner peripheral diameter of the radius R1 of the tip of the chevron 39 provided on the inner peripheral surface of the semicircular arc-shaped portion 36 of the through hole 38 of the side wall portion 22. Projects outward.
  • the outer peripheral surface of the rib portion 146 erected on the outer side in the axial direction of the winding spring side flange portion 133 is the inner periphery of the radius R1 of the tip of the chevron projection 39 provided on the inner peripheral surface of the semicircular arc-shaped portion 36. Located inside the diameter.
  • the reinforcing groove 41 is formed in the inner direction of the side wall portion 22 so that the protruding portion toward the inner side of the side wall portion 22 is substantially the same height as the axial inner side surface of the winding spring side flange portion 133 of the winding drum 105. 4 in the right direction.
  • the reinforcing groove 41 provided in the side wall portion 22 is provided in the webbing 3 even when the winding diameter of the webbing 3 wound around the webbing winding part 131 of the winding drum 105 reaches the maximum winding diameter D7.
  • the side edge portion is provided along the peripheral edge portion of the enlarged portion 37 so as to face the reinforcing groove 41. Therefore, when the webbing 3 is pulled out and wound, the side edge portion facing the side wall portion 22 of the webbing 3 is brought into contact with the axial inner side surface of the winding spring side flange portion 133 or the reinforcing groove 41 and the side edge portion. Are aligned and wound so as not to ride on the winding spring side flange portion 133.
  • FIG. 31 is an explanatory view of the operation of the lock mechanism 10.
  • FIG. 32 is a side view showing a locked state in which the pawl 29 is engaged with the engaging teeth 28A.
  • the operation of the lock mechanism 10 includes a “webbing sensitive lock mechanism” that stops the pulling out of the webbing 3 by abrupt pulling out of the webbing 3, and a “stopping the pulling out of the webbing 3 in response to a sudden change in acceleration of the vehicle”. There is a “body-sensitive lock mechanism”.
  • the pull-out acceleration of the webbing 3 is a predetermined acceleration (for example, about 2.0G).
  • a predetermined acceleration for example, about 2.0G.
  • the lock arm 63 that has been in contact with the stopper 119 maintains the initial position against the biasing force of the sensor spring 107, so that the webbing pull-out direction is centered on the pivot shaft 115 with respect to the locking clutch 106. It is rotated in the opposite direction (clockwise in FIG. 31) until it comes into contact with the detent 121. Therefore, the engagement claw 65 of the lock arm 63 is rotated radially outward with respect to the rotation shaft of the locking clutch 106 and engages with the lock gear 66 of the rib portion 62 of the mechanism cover 58, where the locking clutch The accompanying rotation of the winding drum 105 with the winding drum 105 is stopped.
  • the interlocking pin 122 erected on the side surface of the pawl 29 with the rotation of the winding drum 105 slides in the protruding guide groove 123. Move. Along with this sliding movement, the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the winding drum 105, protrudes radially outward, and penetrates the side wall portion 21.
  • the engaging claw 29A is engaged with the engaging teeth 28A formed on the inner peripheral surface of the hole 28. As a result, the winding drum 105 is prevented from rotating and the drawing of the webbing 3 is stopped.
  • the lock arm 63 when the sudden withdrawal of the webbing 3 is released, the lock arm 63 returns to the initial position where it abuts against the stopper 119 by the urging force of the sensor spring 107. Therefore, the engagement between the engagement claw 65 of the lock arm 63 and the lock gear 66 of the rib portion 62 of the mechanism cover 58 is released. Due to the urging force of the return spring 108, the locking clutch 106 is rotated relative to the winding drum 105 in the webbing pull-out direction (in the direction of the arrow 151), and the interlocking pin 122 moves in the protruding guide groove 123 by this rotation. It slides and returns to the initial position shown in FIG.
  • the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the winding drum 105 and is pulled inward in the radial direction, so that the pawl housing concave portion is moved. It is accommodated in 137 and buried in the mechanism side flange portion 132.
  • the accompanying rotation of the locking clutch 106 with the take-up drum 105 is started, and the webbing 3 is returned to a state where the webbing 3 can be pulled out and taken up.
  • the sensor lever 85 is pushed upward by the mass inertial body 83, and the lock claw 99 of the sensor lever 85 protrudes from the opening 77 of the mechanism cover 58 and is formed on the outer peripheral portion of the locking clutch 106. 112, and the accompanying rotation of the locking clutch 106 with the winding drum 105 is stopped. For this reason, when a load in the pull-out direction is applied to the webbing 3, the take-up drum 105 rotates in the webbing pull-out direction (in the direction of arrow 151) against the urging force of the return spring 108.
  • the interlocking pin 122 erected on the side surface of the pawl 29 slides in the protruding guide groove 123.
  • the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the winding drum 105, protrudes radially outward, and penetrates the side wall portion 21.
  • the engaging claw 29A is engaged with the engaging teeth 28A formed on the inner peripheral surface of the hole 28. As a result, the winding drum 105 is prevented from rotating and the drawing of the webbing 3 is stopped.
  • the inertial mass body 83 moves on the mounting portion 81 of the sensor holder 82 by the gravitational action and is returned to the center position of the mounting portion 81.
  • the locking clutch 106 is rotated relative to the winding drum 105 in the webbing pull-out direction (in the direction of the arrow 151) by the urging force of the return spring 108.
  • the interlocking pin 122 slides in the protruding guide groove 123 and returns to the initial position shown in FIG.
  • the sensor lever 85 is rotated downward by its own weight, and the contact lever 96 extending downward from the extending portion 95 formed on one end side of the sensor lever 85 serves as a restriction wall portion of the sensor holder 82.
  • a predetermined gap 102 is formed between the inertia mass body 83 and the contact portion 98A by contacting the inner surface of 97 (see FIG. 13). Further, the lock claw 99 of the sensor lever 85 is rotated downward and is accommodated in the opening 77 of the mechanism cover 58.
  • the interlocking pin 122 slides in the protruding guide groove 123, the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the take-up drum 105 to move in the radial direction. It is pulled inward and moved into the pawl housing recess 137 and buried in the mechanism side flange portion 132.
  • the accompanying rotation of the locking clutch 106 with the winding drum 105 is started, and the webbing 3 is returned to a state in which the webbing 3 can be pulled out and wound.
  • the reinforcing groove 41 formed so as to be recessed in a substantially semicircular cross section is formed in the side wall portion 22 of the housing 15. It is provided along the periphery of the arc-shaped portion 36 and the enlarged portion 37. Further, the inward direction of the side wall portion 22 is such that the protruding portion of the reinforcing groove 41 toward the inner side of the side wall portion 22 has substantially the same height as the axial inner side surface of the take-up spring side flange portion 133 of the take-up drum 105. Protruding to
  • the reinforcing groove 41 is formed so as to extend to the webbing take-up part 131 side from the tangent to the webbing pull-out direction of the outer peripheral surface of the take-up spring side flange part 133. Further, the reinforcing groove 41 has a side edge portion of the webbing 3 that is reinforced even when the winding diameter of the webbing 3 wound around the webbing winding part 131 of the winding drum 105 reaches the maximum winding diameter D7. It is provided along the peripheral edge of the enlarged portion 37 so as to face the groove 41.
  • the webbing 3 can be prevented from riding on the take-up spring side flange portion 133 with a simple configuration, and the webbing 3 can be pulled out and rolled up. 3 can be carried out smoothly over the entire winding diameter.
  • the side edge part facing the side wall part 22 of the webbing 3 is brought into contact with the inner side surface in the axial direction of the winding spring side flange part 133 or the reinforcing groove 41 and the side edge part. Are aligned and wound so as not to ride on the winding spring side flange portion 133. Further, even if the large through hole 38 is formed in the side wall portion 22, the reinforcement groove 41 is provided along the peripheral edge portion of the semicircular arc-shaped portion 36 and the peripheral edge portion of the enlarged portion 37, thereby reducing the weight of the housing 15. Mechanical strength can be maintained.
  • a boss portion 48A that rotatably supports the spring-side shaft 51 of the winding drum unit 6 is provided on the surface of the spring seat 48 on the side wall portion 22 side, and a radius from the outer peripheral surface of the ring-shaped rib 52 is provided.
  • a plurality of reinforcing ribs 53 are provided up to the outer peripheral portion radially outward in the direction.
  • the upper end portion of each reinforcing rib 53 facing the enlarged portion 37 formed on the side wall portion 22 of the housing 15 is arranged from the outer peripheral surface of the rib 52 to the inner peripheral surface of the enlarged portion 37.
  • a positioning portion 53A is formed so as to protrude at a height substantially equal to the thickness of the side wall portion 22 up to a position opposite to. Then, the positioning portions 53 ⁇ / b> A of the respective reinforcing ribs 53 are fitted into the enlarged portions 37 so as to have substantially the same height as the inner surface of the side wall portion 22.
  • the positioning portions 53A of the reinforcing ribs 53 in the enlarged portion 37 become the peripheral portion of the enlarged portion 37. Therefore, the position of the take-up spring unit 7 in the load direction can be prevented via the spring seat 48, and the webbing 3 can be pulled out and rolled in smoothly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

Selon l'invention, une partie rainure de renforcement formée de telle façon qu'elle s'enfonce dans la direction latérale interne d'une partie paroi latérale, est formée de manière à positionner à proximité d'une partie rebord une section qui longe une partie bord périphérique d'un trou traversant, dans un état dans lequel l'axe central dudit trou traversant formé dans ladite partie paroi latérale et l'axe de rotation d'un tambour d'enroulement coïncident. En outre, une section saillie de la partie rainure de renforcement qui fait saillie dans la direction latérale interne de ladite partie paroi latérale, est formée de manière à ce que sa hauteur soit sensiblement la même que celle d'une face latérale interne de direction axiale de la partie rebord. Enfin, la partie rainure de renforcement, tout en longeant la partie bord périphérique du trou traversant, se prolonge en continu depuis la partie bord périphérique du trou traversant vers le côté externe en inclinaison de direction radiale.
PCT/JP2012/062582 2011-06-07 2012-05-17 Rétracteur de ceinture de sécurité Ceased WO2012169328A1 (fr)

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DE102013220946B4 (de) * 2013-10-16 2017-02-23 Autoliv Development Ab Gurtaufroller mit einer selbstausrichtenden fahrzeugbeschleunigungssensitiven Sensoreinrichtung
JP6523001B2 (ja) * 2015-03-19 2019-05-29 オートリブ ディベロップメント エービー シートベルトリトラクタ
JP6584181B2 (ja) * 2015-07-16 2019-10-02 芦森工業株式会社 加速度センサー及びシートベルト用リトラクタ
JP7517848B2 (ja) * 2020-03-17 2024-07-17 Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ合同会社 リトラクタ及びシートベルト装置

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JPS5626161U (fr) * 1979-08-04 1981-03-10
JPH1095310A (ja) * 1996-09-25 1998-04-14 Tokai Rika Co Ltd ウエビング巻取装置
JPH10310027A (ja) * 1997-05-13 1998-11-24 Nippon Seiko Kk シートベルト用リトラクター

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US3873041A (en) * 1973-09-10 1975-03-25 Firestone Tire & Rubber Co Pawl lock for retractors
US3945587A (en) * 1974-11-12 1976-03-23 The Firestone Tire & Rubber Company Saddle pawl and pendulum support for vehicle sensitive inertial retractors
JPH0657522B2 (ja) * 1985-12-27 1994-08-03 株式会社東海理化電機製作所 ウエビング巻取装置
JP3980078B2 (ja) * 1994-09-07 2007-09-19 タカタ株式会社 シートベルト巻取装置
JP3698379B2 (ja) * 1996-02-16 2005-09-21 エヌエスケー・オートリブ株式会社 シートベルト用リトラクター
JP3787001B2 (ja) * 1996-05-24 2006-06-21 エヌエスケー・オートリブ株式会社 シートベルト用リトラクター
JP3842622B2 (ja) * 2001-11-13 2006-11-08 株式会社東海理化電機製作所 ウエビング巻取装置
JP3947064B2 (ja) * 2002-08-29 2007-07-18 株式会社東海理化電機製作所 ウエビング巻取装置
WO2007007480A1 (fr) * 2005-07-14 2007-01-18 Autoliv Development Ab Dispositif de ceinture de sécurité

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS5626161U (fr) * 1979-08-04 1981-03-10
JPH1095310A (ja) * 1996-09-25 1998-04-14 Tokai Rika Co Ltd ウエビング巻取装置
JPH10310027A (ja) * 1997-05-13 1998-11-24 Nippon Seiko Kk シートベルト用リトラクター

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JP2012250688A (ja) 2012-12-20
KR101485924B1 (ko) 2015-01-27
JP5848034B2 (ja) 2016-01-27
KR20140022949A (ko) 2014-02-25

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