WO2020119405A1 - 用于安全带的旋转收紧装置及其活塞体 - Google Patents

用于安全带的旋转收紧装置及其活塞体 Download PDF

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Publication number
WO2020119405A1
WO2020119405A1 PCT/CN2019/119470 CN2019119470W WO2020119405A1 WO 2020119405 A1 WO2020119405 A1 WO 2020119405A1 CN 2019119470 W CN2019119470 W CN 2019119470W WO 2020119405 A1 WO2020119405 A1 WO 2020119405A1
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WIPO (PCT)
Prior art keywords
piston body
stepped side
tightening device
pipe
groove
Prior art date
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Ceased
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PCT/CN2019/119470
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English (en)
French (fr)
Inventor
拉尔森莱纳斯·卡尔·阿克塞尔
虞悦
许志源
文卡提什沙迦·巴萨拉鲁
乌拉·莎菲
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Autoliv Development AB
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Autoliv Development AB
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Publication date
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Priority to KR1020217021355A priority Critical patent/KR20210124208A/ko
Publication of WO2020119405A1 publication Critical patent/WO2020119405A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • 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
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up

Definitions

  • the invention relates to a rotary tightening device for a safety belt and its piston body.
  • FIG. 1 is a schematic diagram of a rotary tightening device in the prior art. The process of tightening the seat belt by the rotary tightening device is described below with reference to FIG. 1.
  • the gas generator (not shown) located in the end 11 of the pipe 1 is activated by the electronic igniter, the gas generator releases gas by the explosive explosion. This gas exerts a force on the mass body 2 in the pipe 1 via the piston body stored in the pipe 1, so the mass body 2 is driven out of the pipe via the outlet 13 near the other end 12 of the pipe and enters the groove of the drive wheel 3 31.
  • the mass body 2 is continuously driven into the groove 31 of the driving wheel 3 in contact with each other, so that the driving wheel 3 rotates, so that the take-up shaft 4 fixed with the driving wheel 3 rotates in the direction of tightening the seat belt Therefore, the rotating tightening device tightens the seat belt on the take-up shaft.
  • the object of the present invention is to provide a rotary tightening device capable of reliable operation.
  • a piston body for a rotation tightening device of a safety belt a piston body for a rotation tightening device of a safety belt
  • the piston body is configured to drive the mass body in the pipe of the rotary tightening device to leave the pipe and enter the drive wheel of the rotary tightening device when a collision occurs, so that the drive wheel is tightened Rotating in the direction of the seat belt;
  • the abutting end surface of the piston body for abutting the mass body is designed as a flat surface perpendicular to the axial direction of the piston body or a convex surface swelling toward the mass body.
  • the contour curve of the abutting end face is an arc.
  • the radius of the arc of the profile curve abutting the end face is greater than 5.4 mm.
  • the radius of the arc of the profile curve abutting the end face is 15 mm.
  • the piston body includes at least a first stepped side surface and a second stepped side surface, and the first stepped side surface is farther away from the abutting end surface than the second stepped side surface
  • the outer diameter of the first stepped side is designed to be larger than the outer diameter of the second stepped side.
  • the size of the first stepped side surface in the axial direction of the piston body is designed to be half the size of the piston body in the axial direction thereof.
  • the piston body further includes a third stepped side surface between the first stepped side surface and the second stepped side surface, and an outer diameter of the third stepped side surface It is designed to be larger than the outer diameter of the second step side and smaller than the outer diameter of the first stepped side.
  • a groove is provided on the side of the piston body.
  • the piston includes a first groove, a second groove, and a third groove, and the first groove, the second groove, and the third groove are located at The circumferential direction of the piston body is evenly spaced.
  • a sealing lip is provided on a circumferential edge of the first stepped side surface of the piston body away from the abutting end surface.
  • a rotary tightening device for a safety belt which includes a pipe and a mass body contained in the pipe,
  • the piston body is configured to drive the mass body in the pipe of the rotary tightening device to leave the pipe and enter the drive wheel of the rotary tightening device to cause the drive when a collision occurs
  • the wheel rotates in the direction of tightening the seat belt.
  • the piston body includes at least a first stepped side and a second stepped side, the first stepped side is farther from the mass body than the second stepped side, the The outer diameter of the first stepped side is designed to be larger than the outer diameter of the second stepped side and the inner diameter of the pipe, and the outer diameter of the second stepped side is designed to be smaller than the inner diameter of the pipe.
  • a side surface of the piston body is provided with a first groove, and the first groove is arranged to face the diameter of the pipe when the piston body is located in the curved portion of the pipe Inward.
  • the radius of the arc determined by the bend of the pipe is 20 mm-25 mm.
  • the rotary tightening device of the present invention can achieve a good seal, thereby being able to operate reliably.
  • Fig. 1 shows a schematic diagram of a rotary tightening device in the prior art.
  • FIG. 2 is a piston body according to an embodiment of the present invention.
  • FIG. 3 is a rotary tightening device according to an embodiment of the present invention.
  • the piston body according to the present invention is a piston body according to an embodiment of the present invention.
  • the piston body according to the present invention will be described below with reference to FIG. 2. It should be understood that the piston body according to the present invention can be used for a rotation tightening device of a seat belt.
  • the piston body according to the embodiment of the present invention is configured to drive the mass body in the pipe of the rotary tightening device to leave the pipe and enter the driving wheel of the rotary tightening device in the event of a collision, so that The drive wheel rotates in the direction of tightening the seat belt.
  • the piston body 110 includes an abutting end surface C, a first stepped side 111 and a second stepped side 112.
  • the abutting end face C for abutting the mass body is designed as a convex surface (shown as a convex surface convex downward in FIG. 2 ), specifically, in a longitudinal section passing through the axis of the piston body 110,
  • the contour curve against the end surface C is an arc (that is, the curve indicated by the arrow C is a circular arc).
  • the first stepped side surface 111 is farther away from the abutting end surface C than the second stepped side surface 112, and the outer diameter of the first stepped side surface 111 is designed to be larger than the outer diameter of the second stepped side surface 112, so that the entire piston body 110 It appears to narrow as the axial direction of the piston body 110 is downward.
  • the size of the first stepped side surface 111 in the axial direction of the piston body 110 is designed to be half the size of the piston body 110 in the axial direction thereof, that is, the first stepped side surface 111 and the second stepped side surface 112 The dimensions in the axial direction of the piston body 110 are equal.
  • three grooves are provided on the side of the piston body 110, namely, the first groove 114, the second groove and the third groove (neither the second groove nor the third groove is shown in FIG. 2 (Shown), and the first groove 114, the second groove, and the third groove are evenly spaced in the circumferential direction of the piston body 110 (ie, in the circumferential direction of the piston body, the three grooves are 120 degrees apart from each other) .
  • the groove provided on the side of the piston body is used to release the gas in the pipeline after the mass body is successfully driven away from the pipeline into the drive wheel.
  • the circumferential edge of the first stepped side surface 111 of the piston body 110 away from the abutting end surface C (that is, the axial edge of the top surface of the first stepped side surface 111 shown in FIG. 2) Provided with a sealing lip 113.
  • the sealing lip 113 can be used to form a seal with the pipe.
  • FIG. 3 is a rotary tightening device according to an embodiment of the present invention.
  • the rotary tightening device according to the present invention will be described below with reference to FIG. 3.
  • the rotating tightening device shown in FIG. 3 shows a situation where the rotating tightening device needs to rotate in the direction of tightening the seat belt (hereinafter referred to as a pre-tightening phase) when a collision occurs.
  • the mass The body drives the gas generated by the gas generator out of the pipe via the piston body.
  • it is necessary to form a seal between the piston body and the pipeline so that almost all the gas generated by the gas generator acts on the piston body without leakage, and the gas generated by the gas generator can successfully drive the mass body Leave the pipeline.
  • the rotary tightening device 100 includes a piston body 110, a pipe 120 and a mass body 130.
  • the specific structure of the piston body 110 has been described in detail with reference to FIG. 2 and will not be repeated here to avoid redundancy.
  • the outer diameter of the first stepped side 111 is not only designed to be larger than the second stepped side 112 as described with reference to FIG.
  • the outer diameter of the second stepped side surface 112 is smaller than the inner diameter of the pipe 120.
  • the piston body 110 is specifically installed in the rotary tightening device 100 as follows: the abutting end surface C of the piston body 110 is used to abut against the mass body 130, and the first groove 114 provided on the side surface of the piston body 110 is positioned as When the piston body 110 is located in the curved portion of the pipe 120, it faces the radially inner side of the curved portion P of the pipe 120.
  • radially facing the curved portion of the pipe refers to the plane in which the bent portion P of the pipe 120 is located, that is, in the paper plane of FIG. 3, pointing to the upper right of the pipe 120 direction.
  • the radially outer direction of the curved portion of the pipe is directed to the lower left of the pipe, and the first groove 114 on the side of the piston body 110 is positioned to face the position indicated by the arrow of the curved portion P of the pipe 120 (may It is understood that the portion indicated by the arrow of the bending portion P is the radially inner side of the bending portion, and the portion opposite to this portion is the radially outer side of the bending portion).
  • a sealing lip is provided radially outward of the bent portion to assist in providing a seal between the piston body and the pipe.
  • the radius of the arc determined by the bent portion P of the pipe 120 is 20 mm-25 mm.
  • the abutment end face of the piston body is designed as a convex surface, and the contact of the piston body with the mass body at the bent portion of the pipe makes the piston body still aligned with the pipe without being relative to the center of the pipe The line is skewed. Therefore, the rotary tightening device of the present invention can ensure that the piston body forms a good seal between the bent portion of the pipe and the pipe.
  • the abutting end surface of the piston body may be designed as a flat surface perpendicular to the axial direction of the piston body. This design can also make the piston body form a good seal between the pipe bend and the pipe.
  • the outer diameter of the first stepped side is designed to be larger than the inner diameter of the pipe, when the piston body is installed in the pipe, the first stepped side of the piston is tightly pressed on the inner surface of the pipe, therefore, The first stepped side can be used to form a seal with the pipe. At the same time, the sealing lip can also form a seal with the pipe.
  • the rotary tightening device of the present invention can achieve a good seal, thereby being able to operate reliably.
  • the radius of the arc of the profile curve abutting the end face is greater than 5.4 mm.
  • the radius of the arc of the profile curve abutting the end face is 15 mm.
  • the embodiment shown in FIG. 2 is only an example of the piston body for the rotation tightening device of the safety belt according to the present invention.
  • the piston body of the present invention is not limited to the above example.
  • the piston body of the present invention may also be designed such that the piston body further includes a third stepped side surface between the first stepped side surface and the second stepped side surface, and The outer diameter of the three stepped side is designed to be larger than the outer diameter of the second stepped side and smaller than the outer diameter of the first stepped side.
  • the piston body of the present invention may not be provided with a sealing lip.
  • the contour curve of the abutting end surface of the piston body of the present invention in the longitudinal section passing through the axis of the piston body is not limited to an arc, but may also be other convex contour curves, such as a parabola.
  • the embodiment shown in Fig. 3 is only an example of a rotary tightening device for a safety belt according to the present invention.
  • the rotary tightening device of the present invention is not limited to the above example.
  • the rotary tightening device of the present invention may also be designed such that the piston body further includes a third stepped side between the first stepped side and the second stepped side And, the outer diameter of the third stepped side is designed to be larger than the outer diameter of the second stepped side and the inner diameter of the pipe and smaller than the outer diameter of the first stepped side.
  • the grooves on the side of the piston body of the rotary tightening device of the present invention may not be set to three, for example, more or less grooves are provided, but it is necessary to ensure that one groove is positioned as the first groove 114 With the above arrangement of the pipe 120.

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

Abstract

一种用于安全带的旋转收紧装置（100）及其活塞体(110)，所述活塞体(110)被构造为用于在发生碰撞时，驱动所述旋转收紧装置（100）的管道（120）内的质量体（130）离开所述管道（120）并且进入所述旋转收紧装置（100）的驱动轮，以使驱动轮在收紧所述安全带的方向上旋转；所述活塞体(110)的用于抵靠所述质量体（130）的抵靠端面（C）被设计为垂直于所述活塞体(110)的轴向方向的平坦表面或者朝向所述质量体（130）隆起的凸形表面。基于上述活塞体（110）结构，能够实现良好的密封，由此提供一种能够可靠操作的旋转收紧装置（100）。

Description

用于安全带的旋转收紧装置及其活塞体 技术领域
本发明涉及用于安全带的旋转收紧装置及其活塞体。
背景技术
现有技术中已有一种安全带，其在旋转收紧装置上安装有预收紧装置。当发生碰撞时，尤其在碰撞初期，一旦传感器检测到的减速度高于阈值，则触发气体发生器产生反应气体，使得旋转收紧装置向收紧安全带的方向旋转。之后，待冲击力峰值过去，或者乘员已经受到气囊的保护时，适当放松安全带。
图1是现有技术中的旋转收紧装置的示意图。以下参照图1介绍旋转收紧装置收紧安全带的过程。当通过电子点火器启动位于管道1的一端11中的气体发生器(未示出)时，气体发生器通过火药爆炸而释放出气体。该气体经由储存在管道1中的活塞体而向管道1中的质量体2施加力，因此，质量体2被驱动经由管道的另一端12附近的出口13离开管道，并且进入驱动轮3的槽31中。质量体2以彼此接触的方式被连续地驱动进入驱动轮3的槽31中，使得驱动轮3转动，从而使与驱动轮3固定在一起的卷带轴4在收紧安全带的方向上转动，因此，旋转收紧装置收紧在卷带轴上的安全带。
在发生碰撞的初期，为了使气体发生器产生的气体能够将质量体成功地驱动离开管道，期望活塞体与管道内壁之间形成密封，从而使得气体发生器产生的气体几乎全部作用在活塞体上而不发生泄露。
然而，在现有技术的旋转收紧装置中，存在以下问题：当活塞体在管道内移动到管道的弯曲部时，活塞体易于相对于管道倾斜而导致活塞体与管道之间的密封失效，从而造成质量体未受到足够大的力而不能成功地离开管道。因此，无法确保旋转收紧装置的收紧安全带的可靠操作。
因此，期望提供一种能够可靠操作的旋转收紧装置。
发明内容
本发明的目的是提供一种能够可靠操作的旋转收紧装置。
根据本发明的一方面，提供一种用于安全带的旋转收紧装置的活塞体，
所述活塞体被构造为用于在发生碰撞时，驱动所述旋转收紧装置的管道内的质量体离开所述管道并且进入所述旋转收紧装置的驱动轮，以使驱动轮在收紧所述安全带的方向上旋转；
所述活塞体的用于抵靠所述质量体的抵靠端面被设计为垂直于所述活塞体的轴向方向的平坦表面或者朝向所述质量体隆起的凸形表面。
根据本发明的实施例，当所述抵靠端面为凸形表面时，在经过所述活塞体的轴线的纵向断面中，所述抵靠端面的轮廓曲线为一段弧。
根据本发明的实施例，所述抵靠端面的轮廓曲线的弧的半径大于5.4mm。
根据本发明的实施例，所述抵靠端面的轮廓曲线的弧的半径为15mm。
根据本发明的实施例，所述活塞体包括至少第一阶梯型侧面和第二阶梯型侧面，并且，所述第一阶梯型侧面相较于所述第二阶梯型侧面远离所述抵靠端面，所述第一阶梯型侧面的外径设计为大于所述第二阶梯型侧面的外径。
根据本发明的实施例，所述第一阶梯型侧面在所述活塞体的轴向方向上的尺寸设计为所述活塞体在其轴向方向上的尺寸的一半。
根据本发明的实施例，所述活塞体还包括位于所述第一阶梯型侧面和所述第二阶梯型侧面之间的第三阶梯型侧面，并且，所述第三阶梯型侧面的外径设计为大于所述第二台阶侧面的外径且小于第一阶梯型侧面的外径。
根据本发明的实施例，所述活塞体的侧面上设置有凹槽。
根据本发明的实施例，所述活塞包括第一凹槽、第二凹槽和第三凹槽，并且，所述第一凹槽、所述第二凹槽和所述第三凹槽在所述活塞体的周向上均匀隔开。
根据本发明的实施例，所述活塞体的所述第一阶梯型侧面的远离所述 抵靠端面的周向边缘上设置有密封唇。
根据本发明的另一方面，提供一种用于安全带的旋转收紧装置，其包括管道和容纳在所述管道内的质量体，
还包括容纳在所述管道中的任一前述活塞体，所述活塞体的所述抵靠端面用于抵靠所述质量体，其中，
所述活塞体被构造为用于在发生碰撞时，驱动所述旋转收紧装置的所述管道内的所述质量体离开所述管道，并且进入所述旋转收紧装置的驱动轮以使驱动轮在收紧所述安全带的方向上旋转。
根据本发明的实施例，所述活塞体包括至少第一阶梯型侧面和第二阶梯型侧面，所述第一阶梯型侧面相较于所述第二阶梯型侧面远离所述质量体，所述第一阶梯型侧面的外径设计为大于所述第二阶梯型侧面的外径以及所述管道的内径，并且，所述第二阶梯型侧面的外径设计为小于所述管道的内径。
根据本发明的实施例，所述活塞体的侧面上设置有第一凹槽，并且，所述第一凹槽设置为当所述活塞体位于所述管道的弯曲部时面向所述管道的径向内侧。
根据本发明的实施例，由所述管道的弯曲部确定的弧的半径为20mm-25mm。
本发明的旋转收紧装置能够实现良好地密封，由此能够可靠地操作。
附图说明
本发明通过在附图中的示例性实施例进行示例性地阐释，以及以下将参照附图进行详细描述。
图1示出现有技术中的旋转收紧装置的示意图。
图2是根据本发明的一个实施例的活塞体。
图3是根据本发明的一个实施例的旋转收紧装置。
具体实施方式
以下将结合附图描述根据本发明的用于安全带的旋转收紧装置及其活 塞体的具体实施方式。下面的详细描述和附图用于示例性地说明本发明的原理，本发明不限于所描述的优选实施例，本发明的保护范围由权利要求书限定。
此外，空间相关术语(诸如“上”、“下”、“左”和“右”等)用于描述附图所示的元件与另一个元件的相对位置关系。因此，空间相关术语可以应用到使用时与附图所示的方向不同的方向中。显然，虽然为了易于说明，所有这些空间相关术语指的是附图所示的方向，但是本领域技术人员能够理解可以使用与附图中所示的方向不同的方向。
图2是根据本发明的一个实施例的活塞体。以下参照图2介绍根据本发明的活塞体。应当理解，根据本发明的活塞体能够用于安全带的旋转收紧装置。如前面已经介绍的，根据本发明的实施例的活塞体被构造为用于在发生碰撞时，驱动旋转收紧装置的管道内的质量体离开管道并且进入旋转收紧装置的驱动轮，以使驱动轮在收紧安全带的方向上旋转。
如图2所示，活塞体110包括抵靠端面C、第一阶梯型侧面111和第二阶梯型侧面112。用于抵靠质量体的抵靠端面C被设计为隆起的凸形表面(在图2中示为向下隆起的凸形表面)，具体地，在经过活塞体110的轴线的纵向断面中，抵靠端面C的轮廓曲线为一段弧(即，箭头C所指的曲线为圆弧)。第一阶梯型侧面111相较于第二阶梯型侧面112远离抵靠端面C，并且，第一阶梯型侧面111的外径设计为大于第二阶梯型侧面112的外径，使得活塞体110整体呈现出随着活塞体110的轴向向下而收窄。此外，第一阶梯型侧面111在活塞体110的轴向方向上的尺寸设计为活塞体110在其轴向方向上的尺寸的一半，即，第一阶梯型侧面111与第二阶梯型侧面112在活塞体110的轴向方向上的尺寸相等。
如图2所示，活塞体110的侧面上设置有三个凹槽，即，第一凹槽114、第二凹槽和第三凹槽(第二凹槽和第三凹槽均未在图2示出)，并且，第一凹槽114、第二凹槽和第三凹槽在活塞体110的周向上均匀隔开(即，在活塞体的周向上，三个凹槽彼此相距120度)。本领域技术人员能够理解，在发生碰撞的情形下，待冲击力峰值过去或者乘员已经受到气囊的保护时，安全带将被适当放松，此时，之前进入驱动轮的质量体将返 回到管道中。为了质量体能够成功地返回到管道中，设置在活塞体的侧面上的凹槽用于在质量体被成功驱动离开管道进入驱动轮之后，释放管道中的气体。
此外，如图2所示，活塞体110的第一阶梯型侧面111的远离抵靠端面C的周向边缘(即图2所示的第一阶梯型侧面111的顶面的轴向边缘)上设置有密封唇113。密封唇113可以用于与管道形成密封。
图2中示出的活塞体110在用于安全带的旋转收紧装置中的工作过程结合在下文对旋转收紧装置的描述中。
图3是根据本发明的一个实施例的旋转收紧装置。以下参照图3介绍根据本发明的旋转收紧装置。应当理解，图3所示的旋转收紧装置示出了发生碰撞时，需要旋转收紧装置向收紧安全带的方向旋转的情形(以下称为预收紧阶段)，在该情形下，质量体将被气体发生器产生的气体经由活塞体驱动离开管道。与此相应地，需要活塞体与管道之间形成密封，从而使得气体发生器产生的气体几乎全部作用在活塞体上而不发生泄露，由此气体发生器产生的气体能够将质量体成功地驱动离开管道。
如图3所示，旋转收紧装置100包括活塞体110、管道120和质量体130。活塞体110的具体结构已经参照图2进行了详细描述，这里不再赘述以避免冗余。需要指出的是，对于活塞体110包括的第一阶梯型侧面111和第二阶梯型侧面112，第一阶梯型侧面111的外径不仅如参照图2描述的设计为大于第二阶梯型侧面112的外径，而且大于管道120的内径，并且，第二阶梯型侧面112的外径小于管道120的内径。此外，活塞体110在旋转收紧装置100中具体地安装为：活塞体110的抵靠端面C用于抵靠质量体130，并且，活塞体110的侧面上设置的第一凹槽114定位成，当活塞体110位于管道120的弯曲部时面向管道120的弯曲部P的径向内侧。本领域技术人员能够理解，“面向管道的弯曲部的径向内侧”是指，在管道120的弯曲部P所在的平面内，即，图3的纸面平面内，指向管道120的右上方的方向。类似地，管道的弯曲部的径向外侧方向为指向管道的左下方的方向，活塞体110的侧面上的第一凹槽114定位成面向管道120的弯曲部P的箭头所指的位置(可以理解为弯曲部P的箭头所指的部 分为弯曲部的径向内侧，而与该部分相对的部分为弯曲部的径向外侧)。同时，密封唇设置在弯曲部的径向外侧，以辅助提供活塞体与管道之间的密封。而且，管道120的弯曲部P确定的弧的半径为20mm-25mm。
在根据本发明的旋转收紧装置中，活塞体的抵靠端面设计为凸形表面，活塞体在管道的弯曲部处与质量体的接触使得活塞体仍旧与管道对齐而不相对于管道的中心线偏斜。因此，本发明的旋转收紧装置可以确保活塞体在管道的弯曲部处与管道之间形成良好的密封。
可替换地，在根据本发明的旋转收紧装置中，活塞体的抵靠端面可以设计为垂直于活塞体的轴向方向的平坦表面。这种设计同样可以使得活塞体在管道的弯曲部处与管道之间形成良好的密封。
此外，由于第一阶梯型侧面的外径设计为大于管道的内径，因此，当活塞体安装在管道中时，活塞体的第一阶梯型侧面紧密地挤压在管道的内表面上，因此，第一阶梯型侧面能够用于与管道形成密封。同时，密封唇也可以与管道形成密封。
基于以上描述，本发明的旋转收紧装置能够实现良好地密封，由此能够可靠地操作。
优选地，在经过活塞体的轴线的纵向断面中，抵靠端面的轮廓曲线的弧的半径大于5.4mm。
优选地，在经过活塞体的轴线的纵向断面中，抵靠端面的轮廓曲线的弧的半径为15mm。
图2所示的实施例仅仅为根据本发明的用于安全带的旋转收紧装置的活塞体的一个示例。本发明的活塞体不限于上述示例，例如，本发明的活塞体还可以设计为，活塞体还包括位于第一阶梯型侧面和第二阶梯型侧面之间的第三阶梯型侧面，并且，第三阶梯型侧面的外径设计为大于第二台阶侧面的外径且小于第一阶梯型侧面的外径。又例如，本发明的活塞体可以不设置密封唇。又例如，本发明的活塞体的抵靠端面在经过活塞体的轴线的纵向断面中的轮廓曲线不限于弧，还可以是其他凸形轮廓曲线，例如，抛物线。
图3所示的实施例仅仅为根据本发明的用于安全带的旋转收紧装置的 一个示例。本发明的旋转收紧装置不限于上述示例，例如，本发明的旋转收紧装置还可以设计为，活塞体还包括位于第一阶梯型侧面和第二阶梯型侧面之间的第三阶梯型侧面，并且，第三阶梯型侧面的外径设计为大于第二阶梯型侧面的外径以及管道的内径并且小于第一阶梯型侧面的外径。又例如，本发明的旋转收紧装置的活塞体的侧面上的凹槽可以不设置为三个，例如设置更多或更少凹槽，但是需要确保有一个凹槽定位成第一凹槽114与管道120的上述布置。
如前所述，尽管说明中已经参考附图对本发明的示例性实施例进行了说明，但是本发明不限于上述具体实施方式，本发明的保护范围应当由权利要求书及其等同含义来限定。

Claims (20)

  1. 一种用于安全带的旋转收紧装置的活塞体，
    所述活塞体被构造为用于在发生碰撞时，驱动所述旋转收紧装置的管道内的质量体离开所述管道并且进入所述旋转收紧装置的驱动轮，以使驱动轮在收紧所述安全带的方向上旋转；
    其中，
    所述活塞体的用于抵靠所述质量体的抵靠端面被设计为垂直于所述活塞体的轴向方向的平坦表面或者凸形表面。
  2. 根据权利要求1所述的活塞体，其中，当所述抵靠端面为凸形表面时，在经过所述活塞体的轴线的纵向断面中，所述抵靠端面的轮廓曲线为一段弧。
  3. 根据权利要求2所述的活塞体，其中，所述抵靠端面的轮廓曲线的弧的半径大于5.4mm。
  4. 根据权利要求3所述的活塞体，其中，所述抵靠端面的轮廓曲线的弧的半径为15mm。
  5. 根据权利要求4所述的活塞体，其中，所述活塞体包括至少第一阶梯型侧面和第二阶梯型侧面，并且，所述第一阶梯型侧面相较于所述第二阶梯型侧面远离所述抵靠端面，所述第一阶梯型侧面的外径设计为大于所述第二阶梯型侧面的外径。
  6. 根据权利要求5所述的活塞体，其中，所述第一阶梯型侧面在所述活塞体的轴向方向上的尺寸设计为所述活塞体在其轴向方向上的尺寸的一半。
  7. 所述根据权利要求5所述的活塞体，其中，所述活塞体还包括位于所述第一阶梯型侧面和所述第二阶梯型侧面之间的第三阶梯型侧面，并且，所述第三阶梯型侧面的外径设计为大于所述第二台阶侧面的外径且小于所述第一阶梯型侧面的外径。
  8. 根据权利要求6所述的活塞体，其中，所述活塞体的侧面上设置有凹槽。
  9. 根据权利要求8所述的活塞体，其中，所述活塞包括第一凹槽、第二凹槽和第三凹槽，并且，所述第一凹槽、所述第二凹槽和所述第三凹槽在所述活塞体的周向上均匀隔开。
  10. 根据权利要求9所述的活塞体，其中，所述活塞体的所述第一阶梯型侧面的远离所述抵靠端面的周向边缘上设置有密封唇。
  11. 一种用于安全带的旋转收紧装置，其包括管道和容纳在所述管道内的质量体，
    其中，
    还包括容纳在所述管道中的如权利要求1所述的活塞体，所述活塞体的所述抵靠端面用于抵靠所述质量体，其中，
    所述活塞体被构造为用于在发生碰撞时，驱动所述旋转收紧装置的所述管道内的所述质量体离开所述管道，并且进入所述旋转收紧装置的驱动轮以使驱动轮在收紧所述安全带的方向上旋转。
  12. 根据权利要求11所述的旋转收紧装置，其中当所述抵靠端面为凸形表面时，在经过所述活塞体的轴线的纵向断面中，所述抵靠端面的轮廓曲线为一段弧。
  13. 根据权利要求12所述的旋转收紧装置，其中，所述活塞体包括至少第一阶梯型侧面和第二阶梯型侧面，并且，所述第一阶梯型侧面相较于所述第二阶梯型侧面远离所述抵靠端面，所述第一阶梯型侧面的外径设计为大于所述第二阶梯型侧面的外径。
  14. 根据权利要求13所述的旋转收紧装置，其中，所述第一阶梯型侧面在所述活塞体的轴向方向上的尺寸设计为所述活塞体在其轴向方向上的尺寸的一半。
  15. 所述根据权利要求13所述的旋转收紧装置，其中，所述活塞体还包括位于所述第一阶梯型侧面和所述第二阶梯型侧面之间的第三阶梯型侧面，并且，所述第三阶梯型侧面的外径设计为大于所述第二台阶侧面的外径且小于所述第一阶梯型侧面的外径。
  16. 根据权利要求14所述的旋转收紧装置，其中，所述活塞体的侧面上设置有凹槽。
  17. 根据权利要求16所述的旋转收紧装置，其中，所述活塞包括第一凹槽、第二凹槽和第三凹槽，并且，所述第一凹槽、所述第二凹槽和所述第三凹槽在所述活塞体的周向上均匀隔开。
  18. 根据权利要求17所述的旋转收紧装置，其中，所述活塞体的所述第一阶梯型侧面的远离所述抵靠端面的周向边缘上设置有密封唇。
  19. 根据权利要求11所述的旋转收紧装置，其中，所述第一阶梯型侧面的外径设计为大于所述第二阶梯型侧面的外径以及所述管道的内径，并且，所述第二阶梯型侧面的外径设计为小于所述管道的内径。
  20. 根据权利要求12所述的旋转收紧装置，其中，所述活塞体的侧面上设置有所述第一凹槽，并且，所述第一凹槽设置为当所述活塞体位于所述管道的弯曲部时面向所述管道的径向内侧。
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