Active safe forced retreating mechanism, clutch mechanism and retractor

Abstract

The utility model discloses an active safety forced retreating mechanism, a clutch mechanism and a retractor, the active safety forced retreating mechanism comprises a driven gear, one side surface of the driven gear is provided with a mounting cavity, the mounting cavity is internally provided with a guide rail and a first limiting bump, and the middle part of the driven gear is provided with a penetrating hole; the clutch disc and the driven gear are coaxially arranged, and the clutch disc is arranged on the side, provided with the guide rail, of the driven gear; the clutch transmission wheel is arranged at one end of the mandrel assembly and located in the penetrating hole of the driven gear. The locking claw is arranged between the driven gear and the clutch disc, the first end of the locking claw and the clutch disc are rotatably arranged, a guide shaft extending into the guide rail is arranged on one side of the second end of the locking claw, and a first limiting claw is arranged at the second end of the locking claw. When smoke and fire pre-tightening is started, the mandrel assembly rewinds rapidly and provides centrifugal force for the locking claw, so that the first limiting claw crosses the first limiting convex block, the locking claw is kept in the state, and active safe forced withdrawing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle safety engineering, and in particular to an active safety forced retreat mechanism, a clutch mechanism and a retractor. Background Art

[0002] The seat belt retractor is a protective device to protect the safety of drivers and passengers. The existing seat belt retractor has pre-tensioning and force limiting functions. Pre-tensioning is divided into motor pre-tensioning and pyrotechnic pre-tensioning. Motor pre-tensioning is an active safety function. Before a collision, the signal is transmitted through the ECU data, and the core shaft assembly actively rewinds and tightens the webbing under the action of the motor. Pyrotechnic pre-tensioning is a passive safety function. The core shaft assembly quickly rewinds and tightens the webbing under the action of the pyrotechnic pre-tensioner. Since the motor pre-tensioning and pyrotechnic pre-tensioning share the core shaft assembly, and the motor pre-tensioning cannot affect the start of the pyrotechnic pre-tensioning, it is required that when the pyrotechnic pre-tensioning is started, no matter what state the motor pre-tensioning components are in, they must be withdrawn. In the structure of the motor pre-tensioning, the motor is connected to the core shaft assembly through a clutch assembly or a clutch transmission wheel, so a forced withdrawal mechanism is required to ensure that the clutch assembly or the clutch transmission wheel is separated from the core shaft assembly when the pyrotechnic pre-tensioning is started. Utility Model Content

[0003] To this end, the utility model provides an active safety forced retreat mechanism, a clutch mechanism and a retractor to ensure that the clutch assembly or the clutch transmission wheel is separated from the core shaft assembly when the pyrotechnic pre-tensioning is started.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The first aspect of the present application provides an active safety forced retreat mechanism, comprising:

[0006] A passive gear, wherein a mounting cavity is disposed on one side of the passive gear, a smooth guide track is disposed at the bottom of the mounting cavity, a first end of the guide track is closer to the axis of the passive gear than a second end thereof and the guide track is not parallel to the radial direction of the passive gear, a first limiting protrusion protruding toward the center of the passive gear is disposed on the cavity wall on the circumferential side of the mounting cavity, the first limiting protrusion is close to the second end of the guide track, and a through hole is disposed in the middle of the passive gear;

[0007] A clutch disc, coaxially arranged with the passive gear and arranged on a side of the passive gear where the guide track is arranged;

[0008] A clutch transmission wheel is arranged at one end of the spindle assembly and is located in the through hole of the passive gear;

[0009] A locking claw is arranged between the driven gear and the clutch disk, the first end of the locking claw is rotatably arranged with the clutch disk, the second end of the locking claw is provided with a tooth portion on the side facing the axis of the driven gear and the second end is provided with a guide shaft on the side facing the driven gear, the guide shaft extends into the guide track, and the first limiting claw used in conjunction with the first limiting protrusion is provided at the junction of the second end of the locking claw and the end of the second end of the locking claw away from the tooth portion.

[0010] Further, the first limiting protrusion is a triangular block, an end of the first limiting protrusion facing the center of the passive gear is a tip, an end of the first limiting protrusion away from the center of the passive gear is a root, and the root of the first limiting protrusion is fixed to the cavity wall on the peripheral side of the installation cavity; the first limiting claw is a triangular claw, an end of the first limiting claw facing the cavity wall on the peripheral side of the installation cavity is a tip, an end of the first limiting claw away from the cavity wall on the peripheral side of the installation cavity is a root, and the root of the first limiting claw is fixed to the locking claw.

[0011] Furthermore, the first limiting protrusion is integrally formed in the installation cavity, and the first limiting claw is integrally formed on the locking claw.

[0012] Furthermore, the guide track is an arc-shaped guide groove, and the arc center of the guide groove is arranged toward a side close to the axis of the passive gear.

[0013] Furthermore, a accommodating cavity and a rotating shaft cavity communicated with the accommodating cavity are provided on the side of the clutch disc facing the driven gear, a pivot shaft is provided at the first end of the locking claw, the pivot shaft is adapted to be installed in the rotating shaft cavity, and the second end of the locking claw is in the accommodating cavity.

[0014] Furthermore, the locking claw, the guide rail, the first limiting protrusion, and the first limiting claw are provided in plurality, and the plurality of locking claws, the guide rail, the first limiting protrusion, and the first limiting claw are arranged in one-to-one correspondence.

[0015] Furthermore, the clutch transmission wheel and the tooth portion are a ratchet structure.

[0016] The second aspect of the present application provides another active safety forced retreat mechanism, comprising:

[0017] A passive gear, wherein a mounting cavity is disposed on one side of the passive gear, a smooth guide track is disposed at the bottom of the mounting cavity, a first end of the guide track is closer to the axis of the passive gear than a second end thereof and the guide track is not parallel to the radial direction of the passive gear, and a through hole is disposed in the middle of the passive gear;

[0018] A clutch disc is coaxially arranged with the passive gear and arranged on a side of the passive gear provided with a guide track, a side of the clutch disc facing the passive gear is provided with an accommodating cavity and a rotating shaft cavity connected with the accommodating cavity, and a second limiting protrusion is arranged on a side wall of the accommodating cavity;

[0019] A clutch transmission wheel is arranged at one end of the spindle assembly and is located in the through hole of the passive gear;

[0020] A locking claw is arranged between the passive gear and the clutch plate, and a pivot shaft is arranged at the first end of the locking claw, and the pivot shaft is adapted to be installed in the rotating shaft cavity, and the second end of the locking claw is in the accommodating cavity, and a tooth portion is arranged on the side of the second end of the locking claw facing the axis of the passive gear, and a guide shaft is arranged on the side of the second end facing the passive gear, and the guide shaft extends into the guide track, and a second limiting claw used in conjunction with the second limiting protrusion is arranged on the side of the second end of the locking claw facing away from the tooth portion.

[0021] A third aspect of the present application provides a clutch mechanism, which includes the active safety forced retreat mechanism provided in the first aspect or the second aspect of the present application.

[0022] A fourth aspect of the present application provides a retractor, which includes the clutch mechanism provided in the third aspect of the present application.

[0023] The utility model has the following advantages:

[0024] When the pyrotechnic pretensioning is started, the core shaft assembly will rewind quickly under the action of the pyrotechnic pretensioning. At this time, the clutch transmission wheel will provide centrifugal force to the locking claw engaged with it. The locking claw moves along the guide track under the action of centrifugal force, so that the first limit claw (second limit claw) of the locking claw passes over the first limit protrusion (second limit protrusion) of the driven gear (clutch plate), so that the locking claw maintains this state, realizing the forced exit of the active safety function, and then ensuring that after the pyrotechnic pretensioning action is completed, the force limiting function of the retractor can be started normally.

[0025] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] Figure 1 A schematic diagram of the structure of a clutch mechanism and a retractor installed together provided in Example 1 of the utility model;

[0029] Figure 2 A schematic diagram of the structure of a clutch mechanism and a core shaft assembly of a retractor provided in Example 1 of the utility model when installed together;

[0030] Figure 3 A schematic diagram of the structure of a clutch transmission wheel of a clutch mechanism provided in Example 1 of the utility model and a core shaft assembly of a retractor when installed together;

[0031] Figure 4 A schematic diagram of the structure of a clutch mechanism provided in Example 1 of the utility model with the cover removed;

[0032] Figure 5 A schematic structural diagram of a clutch mechanism provided in Example 1 of the utility model in a "closed" state after the cover, friction spring and cover are removed;

[0033] Figure 6 for Figure 5 A schematic diagram of the structure of a clutch mechanism with the clutch disc removed is shown;

[0034] Figure 7 A schematic structural diagram of a clutch mechanism provided in Example 1 of the utility model in a "disengaged" state after the cover, friction spring and cover are removed;

[0035] Figure 8 for Figure 7 A schematic diagram of the structure of a clutch mechanism with the clutch disc removed is shown;

[0036] Fig. 9A schematic diagram of the structure of a passive gear of a clutch mechanism provided in Example 1 of the utility model;

[0037] Fig.10 A schematic structural diagram of a clutch disc of a clutch mechanism provided in Example 1 of the utility model, facing the passive gear;

[0038] Fig.11 A schematic structural diagram of a clutch disc of a clutch mechanism provided in Example 1 of the utility model, which is located on a side away from the driven gear;

[0039] Fig.12 A schematic diagram of a structure in which a locking claw of a clutch mechanism provided in Example 1 of the utility model is installed on a clutch disc;

[0040] Fig.13 A schematic structural diagram of a locking claw of a clutch mechanism provided in Example 1 of the utility model;

[0041] Fig.14 A schematic diagram of the structure of a friction spring of a clutch mechanism provided in Example 1 of the utility model;

[0042] Fig.15 A schematic structural diagram of a limit piece of a clutch mechanism provided in Example 1 of the utility model;

[0043] Fig.16 A schematic structural diagram of a friction spring of a clutch mechanism provided in Example 1 of the utility model installed on a cover.

[0044] Fig.17 This is a structural schematic diagram of another active safety forced retreat mechanism provided in Example 2 of the utility model.

[0045] Fig.18 This is a structural schematic diagram of another active safety forced retreat mechanism provided in Example 2 of the utility model when the second limiting protrusion and the second limiting claw are engaged.

[0046] In the figure: 100-clutch mechanism, 110-motor, 111-transmission gear set, 120-passive gear, 121-guide rail, 122-driving rib, 123-through hole, 124-installation cavity, 125-first limiting protrusion, 130-clutch plate, 131-wheel structure, 132-friction groove, 133-accommodation cavity, 134-rotating shaft cavity, 135-second limiting protrusion. 140-clutch transmission wheel, 150-locking claw, 151-tooth portion, 152-guide shaft, 153-pivot shaft, 154-first limiting claw, 155-second limiting claw, 160-friction spring, 170-cover, 180-limiting plate, 181-connecting plate, 182-window, 200-retractor, 210-core shaft assembly. DETAILED DESCRIPTION

[0047] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0048] Example 1

[0049] like Figure 1-16 As shown, this embodiment provides a retractor 200, which includes a clutch mechanism 100, and the clutch mechanism 100 includes an active safety forced retraction mechanism. Figure 1-16 The clutch mechanism 100 is introduced in detail as shown, and the active safety forced retreat mechanism contained in the clutch mechanism 100 is also introduced.

[0050] The clutch mechanism 100 includes a driven gear 120 , a clutch disc 30 , a clutch transmission wheel 140 and a locking claw 150 , wherein the driven gear 120 , the clutch disc 30 and the clutch transmission wheel 140 are coaxially arranged.

[0051] The passive gear 120 is connected to the motor 110 by transmission. For example, the motor 110 is connected to the passive gear 120 by transmission gear set 111. The motor 110 works under the control of the on-board computer. For example, the motor 110 is a servo motor, a stepper motor or a reduction motor. Preferably, the servo motor can accurately control the rotation angle or number of turns so as to accurately control the tightening degree of the seat belt.

[0052] The side of the passive gear 120 facing the clutch plate 30 is provided with a mounting cavity 124, and the bottom of the mounting cavity 124 is provided with a smooth guide track 121; in this embodiment, the guide track 121 is a guide groove that penetrates the thickness (width) of the passive gear 120, and the arc center of the guide groove is arranged toward the side close to the axis of the passive gear 120, that is, the arc direction of the guide groove is convex outward rather than convex inward. The first end of the guide track 121 is closer to the axis of the passive gear 120 than the second end, and the guide track 121 is not parallel to the radial direction of the passive gear 120 (refer to Figure 6 and 8As shown, the direction from the first end to the second end of the guide track 121 is an arc segment extending counterclockwise), so that the parts slidingly arranged along the guide track 121 (in this embodiment, the guide shaft 152 of the locking claw 150) will approach or move away from the center of the passive gear 120 (in this embodiment, the centripetal swing and centrifugal swing of the second end of the locking claw 150). The side of the passive gear 120 facing the clutch disk 30 is also provided with a driving rib 122, and the driving rib 122 is arranged in the installation cavity 124; in this embodiment, the driving rib 122 is a protrusion-like structure. The driving rib 122 is arranged at the edge of the first end of the guide track 121. The cavity wall on the peripheral side of the installation cavity 124 is provided with a first limiting protrusion 125 protruding toward the center of the passive gear 120, and the first limiting protrusion 125 is close to the second end of the guide track 121. A through hole 123 is provided in the middle of the passive gear 120 . The through hole 123 is used to rotatably fix the passive gear 120 on one hand, and to accommodate the clutch transmission wheel 140 on the other hand.

[0053] The clutch disc 30 is disposed on one side of the driven gear 120 where the guide track 121 is disposed.

[0054] The clutch transmission wheel 140 is arranged in the through hole 123, and is used for transmission connection with the spindle assembly 210 of the retractor 200. Exemplarily, the clutch transmission wheel 140 is installed at the end of the spindle assembly 210.

[0055] The locking pawl 150 is disposed between the driven gear 120 and the clutch disc 30. The first end of the locking pawl 150 is rotatably disposed with the clutch disc 30. A tooth portion 151 is disposed on one side of the second end of the locking pawl 150 facing the axis of the driven gear 120, and after the locking pawl 150 swings centripetally, the tooth portion 151 can mesh with the clutch transmission wheel 140. A guide shaft 152 is provided on the side of the second end of the locking claw 150 facing the passive gear 120, and the guide shaft 152 extends into the guide track 121. In this way, when the passive gear 120 rotates and the clutch disk 30 is stationary, the second end of the locking claw 150 swings centripetally or centrifugally under the interaction of the guide shaft 152 and the guide track 121, and the first end of the locking claw 150 rotates in place. When the guide shaft 152 is at the first end of the guide track 121, the tooth portion 151 engages with the clutch transmission wheel 140, and the end of the second end of the locking claw 150 abuts against the driving rib 122. A first limiting claw 154 is provided at the junction of the second end portion of the locking claw 150 and the end of the second end of the locking claw 150 away from the tooth portion 151. After the locking claw 150 is subjected to the impulse of the clutch transmission wheel 140, the locking claw 150 rapidly and significantly swings centrifugally, and the tip of the first limiting claw 154 will slightly collide with the tip of the first limiting protrusion 125 and further pass over the first limiting protrusion 125. After that, the first limiting claw 154 is limited by the first limiting protrusion 125 to prevent the first limiting claw 154 from passing over the first limiting protrusion 125 in the reverse direction, thereby avoiding the centripetal movement of the locking claw 150.

[0056] The motor 110 rotates forward under the control of the on-board computer, driving the passive gear 120 to rotate counterclockwise. Under the action of the guide track 121, the second end of the locking claw 150 approaches the center part of the passive gear 120 (that is, the second end of the locking claw 150 swings centripetally), so that the tooth portion 151 of the locking claw 150 meshes with the clutch transmission wheel 140, and at the same time, the second end of the locking claw 150 abuts against the driving rib 122, so that the passive gear 120 can drive the clutch transmission wheel 140 to rotate, thereby rotating the core shaft assembly 210 of the retractor 200 to retract the webbing; the motor 110 rotates reversely under the control of the on-board computer, driving the passive gear 120 clockwise. As the clockwise rotation rotates, under the action of the guide track 121, the second end of the locking claw 150 moves away from the central part of the driven gear 120 (that is, the second end of the locking claw 150 makes a centrifugal swing), so that the tooth portion 151 of the locking claw 150 is separated from the clutch transmission wheel 140, and at the same time, the second end of the locking claw 150 is separated from the driving rib 122, so that the driven gear 120 no longer drives the clutch transmission wheel 140 to rotate, thereby allowing the spindle assembly 210 of the retractor 200 to release the webbing (release is a function of the retractor 200. When the clutch mechanism 100 is disengaged from the spindle assembly 210, the spindle assembly 210 releases the webbing to its original state by the force of the winding spring). Under normal working conditions, the rotation of the passive gear 120 cannot make the first limit claw 154 of the locking claw 150 pass over the first limit protrusion 125; when the passive safety system is activated, the pyrotechnic preload will be activated. If the locking claw 150 is in a separated state from the clutch transmission wheel 140 at this time, the pyrotechnic preload will work normally. If the locking claw 150 is in a meshing state with the clutch transmission wheel 140 (such as Figure 6 As shown), when the pyrotechnic preload is started, the spindle assembly will rewind quickly under the action of the pyrotechnic preload, that is, the spindle assembly 210 will rotate counterclockwise quickly, and the teeth of the clutch transmission wheel 140 will provide an impulse to the locking claw 150, which acts on the second end of the locking claw 150 to obtain centrifugal force, so that the second end of the locking claw 150 moves along the guide track 121 on the driven gear 120, overcomes the friction between the clutch plate 130 and the friction spring 160, and moves in the centrifugal direction. Due to the large centrifugal force, the first limiting claw 154 at the second end of the locking claw 150 will pass over the first limiting protrusion 125 of the driven gear 120, so that the locking claw 150 maintains this state (as shown in FIG. Figure 8 As shown), the locking claw 150 can no longer mesh with the clutch transmission wheel 140, thereby ensuring that after the pyrotechnic pre-tightening action is completed, the force limiting function of the retractor 200 can be normally started to protect the occupants.

[0057] It should be noted that the clutch mechanism 100 is used in conjunction with the retractor 200, so they can share a frame, or a fixed structural member can be added to the frame of the retractor 200 as a new frame. In combination with the structure of this embodiment, the motor 110 is relatively fixed to the frame, and the driven gear 120, the clutch disc 30, and the clutch transmission wheel 140 can rotate around their own axis relative to the frame.

[0058] In one embodiment, the first limiting protrusion 125 is a triangular block, and the end of the first limiting protrusion 125 facing the center of the passive gear 120 is a tip, and the end of the first limiting protrusion 125 away from the center of the passive gear 120 is a root, and the root of the first limiting protrusion 125 is fixed to the cavity wall on the peripheral side of the installation cavity 124; the first limiting claw 154 is a triangular claw, and the end of the first limiting claw 154 facing the cavity wall on the peripheral side of the installation cavity 124 is a tip, and the end of the first limiting claw 154 away from the cavity wall on the peripheral side of the installation cavity 124 is a root, and the root of the first limiting claw 154 is fixed to the locking claw 150. In this way, the tip of the first limiting protrusion 125 and the tip of the first limiting claw 154 can form a snap-fit ​​structure, and the collision volume between the tips is small. When the locking claw is subjected to a large centrifugal force and undergoes centrifugal swing, it can be ensured that the first limiting claw 154 can pass over the first limiting protrusion 125 and complete the limiting of the locking claw 150.

[0059] In one embodiment, the first limiting protrusion 125 is integrally formed in the installation cavity 124, and the first limiting claw 154 is integrally formed on the locking claw 150. The integrally formed structure can ensure sufficient connection strength.

[0060] In one embodiment, the clutch mechanism 100 further includes a friction spring 160 and a cover 170. The friction spring 160 is installed on the side of the cover 170 facing the clutch disc 30. The side of the clutch disc 30 facing the cover 170 is provided with a protruding wheel-shaped structure 131, and the peripheral side of the wheel-shaped structure 131 is provided with a friction groove 132. A part of the friction spring 160 is against the friction groove 132, and the friction spring 160 is used to provide a friction force to hinder the rotation of the clutch disc 30. The cover 170 is fixed relative to the frame, so the position of the friction spring 160 is relatively unchanged relative to the frame. In the initial stage of the counterclockwise rotation of the passive gear 120, the clutch disc 30 does not rotate with the passive gear 120 due to the friction force limitation of the friction spring 160. After the second end of the locking claw 150 abuts against the driving rib 122, the passive gear 120 pushes the locking claw 150 to rotate counterclockwise. The first end of the locking claw 150 is rotatably connected to the clutch disc 30. At this time, the clutch disc 30 will overcome the friction force of the friction spring 160 and rotate synchronously with the passive gear 120. By providing the friction spring 160, the clutch disc 30 is prevented from rotating counterclockwise at the beginning of the counterclockwise rotation of the driven gear 120 (in this case, the second end of the locking claw 150 will not be able to make a centripetal swing, which will cause the clutch to fail to "engage" and fail to drive the spindle assembly 210 to rotate counterclockwise); similarly, when the driven gear 120 rotates clockwise, if the clutch disc 30 rotates accordingly, the clutch will fail to "engage", and the friction force of the friction spring 160 will prevent the clutch disc 30 from rotating clockwise with the driven gear 120.

[0061] In one embodiment, a receiving cavity 133 and a shaft cavity 134 communicating with the receiving cavity 133 are provided on one side of the clutch disc 30 facing the driven gear 120, a pivot shaft 153 is provided on the first end of the locking claw 150, the pivot shaft 153 is adapted to be installed in the shaft cavity 134, and the second end of the locking claw 150 is in the receiving cavity 133. In this way, the first end of the locking claw 150 can rotate in situ, and the second end of the locking claw 150 can have space for centripetal and centrifugal swing.

[0062] In this embodiment, the clutch disc 30 and the locking claw 150 are both arranged in the installation cavity 124, and the driving rib 122 is arranged in the installation cavity 124 and protrudes into the accommodating cavity 133. The clutch mechanism 100 also includes a limiting piece 180, which is arranged on the side of the clutch disc 30 away from the passive gear 120, and the edge of the limiting piece 180 is provided with a connecting piece 181, and the connecting piece 181 is connected to the passive gear 120. The limiting piece 180 and the passive gear 120 package the clutch disc 30 and the locking claw 150 inside. By providing the limiting piece 180, the clutch disc 30 and the locking claw 150 can be restricted in the installation cavity 124 of the passive gear 120. Among them, the middle part of the limiting piece 180 is provided with a window 182 for the wheel-shaped structure 131 of the clutch disc 30 to pass through.

[0063] In one embodiment, the locking claw 150, the guide rail 121, the driving rib 122, the first limiting protrusion 125, and the first limiting claw 154 are respectively provided in plurality, and the plurality of locking claws 150, the guide rail 121, the driving rib 122, the first limiting protrusion 125, and the first limiting claw 154 are arranged in one-to-one correspondence. The one-to-one corresponding locking claws 150, the guide rail 121, and the driving rib 122 are regarded as a set of locking structures, and the one-to-one corresponding locking claws 150 (including the guide shaft 152), the guide rail 121, the first limiting protrusion 125, and the first limiting claw 154 are regarded as a set of forced retreat mechanisms. Preferably, the multiple sets of locking structures are arranged symmetrically with the center of the passive gear 120 or the clutch transmission wheel 140 as the center of the circle. In this way, the structural strength can be improved and the torque can be evenly distributed.

[0064] In one embodiment, the clutch transmission wheel and the tooth portion 151 are ratchet and ratchet structures. Thus, when the power of the passive gear 120 needs to be transmitted to the spindle assembly 210 of the retractor 200, the clutch transmission wheel and the tooth portion 151 of the ratchet and ratchet structure can transmit the power, and after the reverse rotation, the clutch transmission wheel and the tooth portion 151 of the ratchet and ratchet structure also facilitate the separation of the tooth portion 151 from the clutch transmission wheel 140.

[0065] Example 2

[0066] Example 2 provides another active safety forced retreat mechanism applied to the clutch mechanism provided in Example 1. Therefore, this example no longer describes the structure of the clutch mechanism. For related structures (such as the passive gear, clutch plate, clutch transmission wheel and locking claw), see the contents of Example 1.

[0067] In this embodiment, if Fig.17 and 18 As shown, a second limiting protrusion 135 is provided on the side wall of the accommodating cavity 133 ; a second limiting claw 155 for use in conjunction with the second limiting protrusion 135 is provided on the side of the second end of the locking claw 150 away from the tooth portion 151 .

[0068] When the pyrotechnic preload is activated, the spindle assembly will rewind rapidly under the action of the pyrotechnic preload. At this time, the clutch transmission wheel will provide centrifugal force to the locking claw 150 engaged therewith. Under the action of the centrifugal force, the locking claw 150 moves along the guide track, so that the second limiting claw 155 of the locking claw 150 passes over the second limiting protrusion 135 of the clutch disc 130, so that the locking claw 150 maintains this state (such as Fig.18 As shown), the locking claw 150 can no longer mesh with the clutch transmission wheel, thereby achieving the forced exit of the active safety function, thereby ensuring that the force limiting function of the retractor can be normally started after the pyrotechnic pre-tightening action is completed.

[0069] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0072] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0074] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An active safety forced retreat mechanism, characterized in that: include: A passive gear, wherein a mounting cavity is disposed on one side of the passive gear, a smooth guide track is disposed at the bottom of the mounting cavity, a first end of the guide track is closer to the axis of the passive gear than a second end thereof and the guide track is not parallel to the radial direction of the passive gear, a first limiting protrusion protruding toward the center of the passive gear is disposed on the cavity wall on the circumferential side of the mounting cavity, the first limiting protrusion is close to the second end of the guide track, and a through hole is disposed in the middle of the passive gear; A clutch disc, coaxially arranged with the passive gear and arranged on a side of the passive gear where the guide track is arranged; A clutch transmission wheel is arranged at one end of the spindle assembly and is located in the through hole of the passive gear; A locking claw is arranged between the driven gear and the clutch disk, the first end of the locking claw is rotatably arranged with the clutch disk, the second end of the locking claw is provided with a tooth portion on the side facing the axis of the driven gear and the second end is provided with a guide shaft on the side facing the driven gear, the guide shaft extends into the guide track, and the first limiting claw used in conjunction with the first limiting protrusion is provided at the junction of the second end of the locking claw and the end of the second end of the locking claw away from the tooth portion.

2. The active safety forced retreat mechanism according to claim 1, characterized in that: The first limiting protrusion is a triangular block, and the end of the first limiting protrusion facing the center of the passive gear is a tip, and the end of the first limiting protrusion away from the center of the passive gear is a root, and the root of the first limiting protrusion is fixed to the cavity wall on the peripheral side of the installation cavity; the first limiting claw is a triangular claw, and the end of the first limiting claw facing the cavity wall on the peripheral side of the installation cavity is a tip, and the end of the first limiting claw away from the cavity wall on the peripheral side of the installation cavity is a root, and the root of the first limiting claw is fixed to the locking claw.

3. The active safety forced retreat mechanism according to claim 1, characterized in that: The first limiting protrusion is integrally formed in the installation cavity, and the first limiting claw is integrally formed on the locking claw.

4. The active safety forced retreat mechanism according to claim 1, characterized in that: The guide track is an arc-shaped guide groove, and the arc center of the guide groove is arranged toward a side close to the axis of the passive gear.

5. The active safety forced retreat mechanism according to claim 1, characterized in that: There are a plurality of locking claws, guide rails, first limiting protrusions, and first limiting claws, respectively, and the plurality of locking claws, guide rails, first limiting protrusions, and first limiting claws are arranged in one-to-one correspondence.

6. The active safety forced retreat mechanism according to claim 1, characterized in that: The clutch transmission wheel and the tooth portion are a ratchet structure.

7. An active safety forced retreat mechanism, characterized in that: include: A passive gear, wherein a mounting cavity is disposed on one side of the passive gear, a smooth guide track is disposed at the bottom of the mounting cavity, a first end of the guide track is closer to the axis of the passive gear than a second end thereof and the guide track is not parallel to the radial direction of the passive gear, and a through hole is disposed in the middle of the passive gear; A clutch disc is coaxially arranged with the passive gear and arranged on a side of the passive gear provided with a guide track, a side of the clutch disc facing the passive gear is provided with an accommodating cavity and a rotating shaft cavity connected with the accommodating cavity, and a second limiting protrusion is arranged on a side wall of the accommodating cavity; A clutch transmission wheel is arranged at one end of the spindle assembly and is located in the through hole of the passive gear; A locking claw is arranged between the passive gear and the clutch plate, and a pivot shaft is arranged at the first end of the locking claw, and the pivot shaft is adapted to be installed in the rotating shaft cavity, and the second end of the locking claw is in the accommodating cavity, and a tooth portion is arranged on the side of the second end of the locking claw facing the axis of the passive gear, and a guide shaft is arranged on the side of the second end facing the passive gear, and the guide shaft extends into the guide track, and a second limiting claw used in conjunction with the second limiting protrusion is arranged on the side of the second end of the locking claw facing away from the tooth portion.

8. A clutch mechanism, characterized in that: It comprises an active safety forced retreat mechanism as described in any one of claims 1-7.

9. A retractor, characterized in that: Comprising the clutch mechanism as claimed in claim 8.

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