• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An object of the present invention is to obtain a pretensioner for a webbing take-up device that can reduce cost and prevent abutting sound between a cylinder bottom and a piston due to vibration or the like. The pretensioner 10 for the webbing take-up device of the webbing take-up device 38 is configured such that when gas is supplied to the cylinder 20, the piston 28 moves so that the webbing 16 is wound around the take-up shaft 14. When attaching the pretensioner 10 for the webbing take-up device, the O-ring 34 is coupled to the seal holder 32 of the piston 28 to insert the piston 28 together with the O-ring 34 into the cylinder 20. Let's do it. This eliminates the need for cutting to form a seal retaining groove as in the prior art, thereby reducing the cost. In the normal state, the piston 28 does not directly contact the cylinder bottom 24 as in the prior art, but the O-ring 34 contacts the cylinder bottom 24. Therefore, the abutment sound between the cylinder bottom part 24 and the piston 28 by vibration etc. can be prevented.
    公开号:KR20000056948A
    申请号:KR1019990016267
    申请日:1999-05-07
    公开日:2000-09-15
    发明作者:나가타도모노리；니시데세이지；호리세이지
    申请人:기사키 아키라；가부시키가이샤 도카이리카덴키세이사쿠쇼；
    IPC主号:
    专利说明:

    Pretensioner for webbing retractor {PRETENSIONER FOR WEBBING RETRACTOR}
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretensioner for a webbing take-up device, in which webbing is loosened by forcibly winding the webbing on a take-up shaft during a sudden deceleration of a vehicle due to a collision or the like.
    Some webbing take-up devices are provided with a pretensioner which forcibly winds the webbing onto the take-up shaft during the sudden deceleration of the vehicle due to a collision or the like to eliminate the looseness of the webbing.
    In such a pretensioner, for example, as shown in FIG. 5, the pinion 56 is provided in the webbing take-up device 50 provided with the so-called rack & pinion system. The webbing 58 is connected to the winding shaft 60 to be wound and rotates integrally with the winding shaft 60 at all times. Moreover, the cylinder 52 is provided in the vicinity of the pinion 56, and gas is supplied to the cylinder 52 when the vehicle decelerates urgently.
    The piston 62 is provided in the cylinder 52 so that the piston 62 can move, The piston 62 can move to the arrow C direction of FIG. 5 by the pressure of gas, when a vehicle decelerates urgently. The rack 64 is integrally disposed on the pinion 56 side surface of the piston 62. The rack 64 moves together with the piston 62 to engage the pinion 56 so as to weave the pinion 56 together. 58), it can rotate in the winding direction (the arrow A direction of FIG. 5). In this way, when the vehicle decelerates urgently, the webbing 58 is wound around the take-up shaft 60, and the webbing 58 can be loosened.
    In addition, the piston 62 is positioned at the initial position by the piston 62 touching the bottom portion 66 of the cylinder 52. The side of the piston 62 is formed with a cutting thread retaining groove 68, the seal retaining groove 68 is mounted with an elastic O-ring 70. By sealing the O-ring 70 between the piston 62 and the inner wall 72 of the cylinder 52, the airtightness between the piston 62 and the cylinder 52 is improved.
    By the way, in such a webbing retractor 50, since the cutting process for forming the thread holding groove 68 takes a long time, the cost is increased and the diameter of the O-ring 70 is widened in the thread holding groove 68. Work must be difficult because it must be installed.
    For this purpose, in the webbing take-up device 80 described in, for example, Japanese Patent Laid-Open No. 9-202213 (see Fig. 6), the piston 82 is the piston body 84 and the hydraulic plate 86. ), The O-ring 88 is sandwiched between the piston body 84 and the hydraulic plate 86. According to this webbing retractor 80, the O-ring 88 is sandwiched between the piston body 84 and the hydraulic plate 86, so that the cutting and seal retaining grooves 68 forming the seal retaining grooves 68 are formed. No work is required to mount the O-ring 70.
    However, in this webbing retractor 80, since the piston 82 is divided into the piston main body 84 and the hydraulic plate 86, the number of parts increases and a cost rises. In addition, there is a problem that the bottom portion 66 of the cylinder 52 and the hydraulic plate 86 of the piston 82 come into contact with each other due to vibration or the like.
    In addition, in the webbing retractor 50 shown in Fig. 5, when a vehicle is provided with a so-called force limiter mechanism that prevents a passenger from applying a load more than a certain amount when the vehicle decelerates urgently, the pinion 56 is operated when the force limiter is operated. ) Rotates in the semi-winding direction of the webbing 58 (the arrow B direction in FIG. 5), so that the piston 62 moves in the direction of the bottom portion 66 of the cylinder 52 (the arrow D direction in FIG. 5) so that the piston ( 62 touches the bottom 66 of the cylinder 52. This locks the pinion 56 and the rack 64, which damages the pinion 56 or the rack 64 and prevents the piston 62 from descending below its initial position, thus affecting the operation of the force limiter. It may be.
    An object of the present invention is to obtain a pretensioner for a webbing take-up device that can reduce the cost in consideration of the above problems and can prevent the sound coming into contact between the cylinder bottom and the piston due to vibration or the like.
    1 is a side view of a schematic configuration of a webbing take-up device according to an embodiment of the present invention;
    2 is an exploded perspective view of a schematic configuration of a webbing retractor;
    3 is a side view when the pretensioner of the webbing take-up device is operated;
    4 is a side view when the force limiter of the webbing take-up device is operated;
    5 is a side view showing a schematic configuration of a conventional webbing retractor;
    6 is a side view showing a schematic configuration of a conventional webbing retractor.
    Explanation of symbols on the main parts of the drawings
    10: pretensioner 14: winding shaft
    16: webbing 18: pinion
    20: cylinder 24: cylinder bottom
    26: recess 27: bottom
    28: piston 30: rack
    32: seal holder 34: O-ring (thread member)
    36: inner wall 38: webbing retractor
    The invention of claim 1 is configured to move around the cylinder by a winding shaft to which webbing is wound, a cylinder to which fluid is supplied when the vehicle decelerates urgently, and the cylinder, and by moving the inside of the cylinder by the pressure of the fluid. A piston for rotating the winding shaft in the webbing winding direction, a seal holder integrally formed on the cylinder bottom side of the piston and protruding circumferentially; And a seal member that seals between the inner wall of the cylinder and the cylinder bottom part while the piston does not directly contact the bottom part of the cylinder.
    According to the invention of claim 1, when attaching the pretensioner for the webbing take-up device, the seal member is coupled to the outer circumference of the seal holding portion integrally formed on the cylinder bottom side of the piston, and the piston is inserted into the cylinder together with the seal member. This eliminates the need for cutting to form a seal retaining groove as in the prior art, thereby reducing the cost. In addition, the diameter of the seal member can be widened so that it is not necessary to mount the seal member in the seal retaining groove so that the work can be easily performed.
    In a normal vehicle driving state, since the piston does not directly contact the cylinder bottom portion but the seal member touches the cylinder bottom portion as in the prior art, abutment sound between the cylinder bottom portion and the piston due to vibration or the like can be prevented.
    When the vehicle decelerates urgently, fluid is supplied to the cylinder and the piston moves according to the pressure of the fluid. When the piston moves, the take-up shaft rotates in the webbing take-up direction, and the webbing is wound around the take-up shaft, thereby eliminating the looseness of the webbing 16. Here, when the piston moves by the pressure of the fluid, the pressure of the fluid acts on the seal member, so that the seal member is not pressed by the piston and does not escape from the seal holder. This makes it possible to improve the airtightness between the piston and the cylinder by sealing the seal member between the piston and the inner wall of the cylinder.
    Here, when the webbing take-up device to which such a pretensioner is applied is provided with a force limiter mechanism, when the force limiter operates, the take-up shaft rotates in the semi-winding direction of the webbing and the webbing is released, so that the occupant is decelerated urgently. Do not apply more than a certain amount of load to the product. Here, even if the winding shaft rotates in the half winding direction of the webbing and the piston moves in the direction of the cylinder bottom, the seal member contacts the cylinder bottom and the piston does not directly contact the cylinder bottom. In this way, the abutment sound between the cylinder bottom and the piston can be prevented.
    In addition, when the seal member is in contact with the bottom of the cylinder, the seal member is elastic, so the seal member is pressed. Thus, the piston can be lowered below the initial position, thereby preventing the influence of the force limiter operation.
    In addition, since the piston is not divided into the piston body and the hydraulic plate as in the prior art, it is possible to reduce the cost by reducing the number of parts.
    As described above, in the invention of claim 1, the adhesiveness can be improved to reduce the cost, and the abutment sound between the cylinder bottom and the piston due to vibration or the like can be prevented.
    According to a second aspect of the present invention, in the webbing retractor of claim 1, a recess is formed in the bottom of the cylinder to correspond to the thread holding portion, and the recess is formed in the state where the thread holding member is elastically deformed. It is characterized in that it is formed to a depth that does not touch the bottom of the recess.
    According to the invention of claim 2, since the recess formed in the bottom of the cylinder is formed to a depth where the seal retaining portion does not touch the bottom of the recess in the state where the seal member is elastically deformed, it is effectively prevented from affecting the operation of the force limiter. can do.
    (Example)
    1 shows a schematic configuration of a webbing take-up device 38 to which a pretensioner 10 for a webbing take-up device according to an embodiment of the present invention is applied, and FIG. 2 shows a schematic configuration of a webbing take-up device 38. Shown in exploded perspective view.
    The webbing retractor 38 is provided with a frame 12, and the frame 12 is fixed to the vehicle. The winding shaft 14 is fixed to the frame 12 so that the winding shaft 14 can rotate, and the webbing 16 is wound around the winding shaft 14.
    In addition, the webbing take-up device 38 includes a pretensioner 10 for a webbing take-up device of the rack & pinion system, and the pinion 18 is connected to one end of the take-up shaft 14. The pinion 18 is always integrally rotated with the take-up shaft 14, whereby the take-up shaft 14 is rotated by the pinion 18 so that the webbing 16 may be wound or unwound.
    The cylinder 20 is fixed to the frame 12. The cylinder 20 is formed in a hollow cylinder shape, and the tip end 22 side is opened near the pinion 18. On the other hand, the cylinder bottom part 24 is formed with the columnar recessed part 26. As shown in FIG. The concave portion 26 is smaller than the inner diameter of the cylinder 20. The concave portion 26 of the O-ring 34, which will be described later, is joined by joggling the cylinder bottom portion 24 and the concave portion 26. The location is determined. The recess 26 is provided with a gas supply port (not shown). When the vehicle decelerates urgently due to a collision or the like, gas as a fluid is supplied from the gas supply port into the cylinder 20.
    In the cylinder 20, a substantially disk-shaped piston 28 is provided, and the piston 28 is able to move in the cylinder 20. As shown in FIG. In this way, when gas is supplied into the cylinder 20, the piston 28 moves to the arrow C direction of FIG. 3 by the pressure of this gas.
    The rack 30 is integrally formed on the pinion 18 side surface of the piston 28. The rack 30 corresponds to the pinion 18. When the rack 30 moves in the direction of arrow C of FIG. 3 together with the piston 28, the rack 30 meshes with the pinion 18 to pinion 18. The webbing 16 rotates in the winding direction (arrow A direction in FIG. 3).
    A cylindrical seal holding portion 32 is integrally formed on the cylinder bottom portion 24 side of the piston 28, and an O-ring 34 of a seal member is coupled to the outer circumference of the seal holding portion 32. have. The O-ring 34 is elastic to seal between the piston 28 and the inner wall 36 of the cylinder 20.
    In addition, the O-ring 34 is in contact with the cylinder bottom 24 in such a state that the piston 28 does not directly contact the cylinder bottom 24, and the position of the piston 28 in this state is the piston 28. It is the initial position. In the normal state where the O-ring 34 is in contact with the cylinder bottom 24, the seal holder 32 is located in the recess 26 of the cylinder bottom 24. Moreover, the recessed part 26 is formed in the depth which the thread holding part 32 does not contact the bottom 27 of the recessed part in the state in which the O-ring 34 was elastically deformed.
    The webbing take-up device 38 provided with the pretensioner 10 for the webbing take-up device by the rack & pinion system as described above is provided with a force limiter mechanism (not shown), and the pinion 18 when the force limiter operates. The webbing 16 is rotated in the semi-winding direction (arrow B direction in Fig. 4) of the webbing 16 to release the load so that a certain amount of load or more is not applied to the occupant when the vehicle decelerates urgently.
    Next, the operation of the present embodiment will be described.
    When attaching the pretensioner 10 for webbing take-up device of the webbing take-up device 38 of the said structure, an O-ring is formed on the outer periphery of the seal holding part 32 integrally formed in the cylinder bottom part 24 side surface of the piston 28. Engage the (34) and insert the piston (28) together with the O-ring (34) into the cylinder (20). This eliminates the need for cutting to form a seal retaining groove as in the prior art, thereby reducing the cost. In addition, since the diameter of the O-ring is widened, it is not necessary to install the O-ring in the seal retaining groove so that the work can be easily performed.
    In the normal vehicle driving state, the piston 28 does not directly contact the cylinder bottom 24 as in the prior art, and the O-ring 34 touches the cylinder bottom 24 so that the cylinder bottom 24 due to vibration or the like is not. The abutment sound between the pistons 28 can be prevented.
    When the vehicle decelerates urgently, as shown in Fig. 3, gas is supplied to the cylinder 20, and the piston 28 moves in the direction of arrow C in Fig. 3 by the pressure of the gas. When the piston 28 moves in the direction of arrow C in FIG. 3, the rack 30 moves together with the piston 28, and the rack 30 engages with the pinion 18 so that the pinion 18 winds up the webbing 16. Direction (arrow A in Fig. 3). When the pinion rotates in the winding direction of the webbing, the webbing 16 is wound around the winding shaft 14 to eliminate the looseness of the webbing 16. When the piston 28 moves by the pressure of the gas, the pressure of the gas acts on the O-ring 34 so that the O-ring 34 is pressed against the piston 28 so as not to be released from the seal holder 32. As a result, the O-ring 34 seals between the piston 28 and the inner wall 36 of the cylinder 20, thereby improving the airtightness between the piston 28 and the cylinder 20.
    When the force limiter operates, as shown in Fig. 4, the pinion 18 is rotated in the semi-winding direction of the webbing 16 (in the direction of arrow B in Fig. 4), and the webbing 16 is released so that the vehicle may decelerate urgently. Do not apply more than a certain amount of load to the occupant. Here, the pinion 18 rotates in the semi-winding direction of the webbing 16, so that the O-ring 34 moves to the cylinder bottom 24 even when the piston 28 moves in the direction of the cylinder bottom 24 (arrow D in FIG. 4). The piston 28 does not directly contact the cylinder bottom 24 in contact with the 24. In this way, the abutment sound between the cylinder bottom part 24 and the piston 28 can be prevented.
    In addition, when the O-ring 34 contacts the cylinder bottom portion 24, the O-ring 34 is elastic and the O-ring 34 is pressed tightly. In the state where the O-ring 34 is elastically deformed, the seal holding portion 32 does not contact the bottom 27 of the recess 26 of the cylinder bottom 24. Therefore, it is possible to prevent the pinion 18 and the rack 30 from being damaged by preventing the lock of the pinion 18 and the rack 30, and the piston 28 can be lowered lower than the initial position, thereby affecting the operation of the force limiter. Can be prevented.
    In addition, since the piston is not divided into the piston body and the hydraulic plate as in the prior art, it is possible to reduce the cost by reducing the number of parts.
    As described above, the webbing take-up device 38 according to the present embodiment can reduce the cost and prevent the abutment sound between the cylinder bottom 24 and the piston 28 due to vibration or the like.
    According to the invention of claim 1, there is no need for machining the piston as in the prior art, and the cost can be reduced by reducing the number of parts.
    In addition, since the piston does not directly contact the bottom of the cylinder, but the seal member touches the bottom of the cylinder as in the related art, it is possible to prevent the sound contacting between the bottom of the cylinder and the piston due to vibration or the like.
    According to the invention of claim 2, since the seal retaining portion does not contact the bottom of the concave portion in the state where the seal member is elastically deformed, the piston 28 can be lowered lower than the initial position when the force limiter is operated, thereby operating the force limiter. It can effectively prevent the influence on.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] Winding shaft to which webbing is wound,
    A cylinder to which fluid is supplied during rapid deceleration of the vehicle,
    A piston which is formed to be movable in the cylinder, and which rotates the winding shaft in the webbing winding direction by moving the cylinder in the cylinder by the pressure of the fluid;
    A seal holder formed integrally with the cylinder bottom side of the piston and protruding circumferentially;
    It has elasticity, is coupled to the outer periphery of the seal holding portion to seal between the piston and the inner wall of the cylinder and the seal member that is in contact with the cylinder bottom without the piston directly touching the bottom of the cylinder
    A pretensioner for a webbing take-up device to be provided.
    [2" claim-type="Currently amended] The method of claim 1,
    A recess is formed at the bottom of the cylinder in correspondence with the seal holder;
    The concave portion is a pretensioner for a webbing take-up device, characterized in that the seal retaining portion is formed to a depth that does not touch the bottom of the concave portion in a state in which the seal member is elastically deformed.
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    同族专利:
    公开号 | 公开日
    DE69924701D1|2005-05-19|
    KR100532007B1|2005-11-29|
    US6089492A|2000-07-18|
    JP2000229556A|2000-08-22|
    EP1028040B1|2005-04-13|
    EP1028040A3|2002-06-12|
    JP3519302B2|2004-04-12|
    DE69924701T2|2005-09-15|
    EP1028040A2|2000-08-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-02-09|Priority to JP11-31864
    1999-02-09|Priority to JP03186499A
    1999-05-07|Application filed by 기사키 아키라, 가부시키가이샤 도카이리카덴키세이사쿠쇼
    2000-09-15|Publication of KR20000056948A
    2005-11-29|Application granted
    2005-11-29|Publication of KR100532007B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP11-31864|1999-02-09|
    JP03186499A|JP3519302B2|1999-02-09|1999-02-09|Pretensioner for webbing take-up device|
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