Seat belt retractor

Abstract

A seat belt retractor, mounted on a seat back and comprising a spool assembly and a mechanical sensing assembly (6). The retractor further comprises a friction clutch member (5); the side of the friction clutch member (5) close to a locking disc (4) extends to form a plurality of elastic protrusions (51); the elastic protrusions (51) abut against the locking disc (4), so that when the locking disc (4) rotates, the friction clutch member (5) is driven to rotate synchronously; the side of the friction clutch member (5) away from the locking disc (4) extends toward a stabilizing locking piece (67) to form a latching portion (52), wherein when a seat belt is pulled out, a spool (2), the locking disc (4) and the friction clutch member (5) are driven to rotate, so that the latching portion (52) is engaged with the stabilizing locking piece (67), thereby limiting the rotation of a gravity sensing device. The friction clutch member (5) and the locking disc (4) are always in point-to-surface contact, which can ensure the reliability of contact and the consistency of friction force, and ensure that when the locking disc (4) rotates, the friction clutch member (5) can be driven to rotate synchronously; moreover, the latching portion (52) is engaged with the stabilizing locking piece (67) to limit the rotation of the gravity sensing device, so that the locking of the gravity sensing device can be flexibly switched and be adjusted within a wide angular range.

Description

A seat belt retractor TECHNICAL FIELD

[0001] The present specification relates to the technical field of retractor, in particular to a seat belt retractor. BACKGROUND

[0002] The seat belt retractor is the core component of the automobile safety belt protection device, which can fix the seat belt when the passenger is suddenly impacted, so as to protect the passenger. Most of the conventional retractor only has a single installation angle mechanical locking structure, and a small amount of retractor in the market can meet the multi-installation angle, but the locking performance will decrease at different angles (backrest adjustment), and a set of mechanical sensing part stabilizing device needs to be added to ensure the stability of the locking sensing seat. The locking sensing seat needs to be fixed and non-fixed mechanical movement in the mechanical stabilizing device, which can ensure the locking performance in the fixed state, and can ensure the multi-angle adjustment in the non-fixed state. SUMMARY

[0003] Therefore, the present specification provides a seat belt retractor, which sets a friction clutch, and sets an elastic protruding part on the friction clutch, which abuts against the locking disc, so as to ensure that the locking disc can drive the friction clutch to rotate synchronously when rotating, and the point-surface contact between the friction clutch and the locking disc can ensure the reliability of the contact and the consistency of the friction force. Meanwhile, a clamping part on the friction clutch cooperates with the stable locking piece of the gravity sensing device, and when the seat belt is pulled out, the clamping part cooperates with the stable locking piece, so as to limit the rotation of the gravity sensing device, and the locking of the gravity sensing device can be flexibly switched in large angle adjustment.

[0004] The present specification provides the following technical solutions: a seat belt retractor, which is installed on a seat backrest, and comprises a reel assembly and a mechanical sensing assembly.

[0005] The reel assembly comprises a reel spring, a reel, a bracket and a locking disc, the reel is rotatably fixed in the bracket, the reel spring is fixed on one side of the bracket outside, the reel spring is fixedly connected with one end of the reel, and the reel spring always provides a winding force for the reel to recover the seat belt, and the locking disc is fixedly connected with the other end of the reel, and the locking disc is arranged on the other side of the bracket outside.

[0006] The mechanical sensing assembly comprises a gravity sensing device and a stable locking piece, the gravity sensing device is rotatably fixed on the support through a pivot shaft, the gravity sensing device can rotate around the pivot shaft under the action of its own gravity and keep vertical state, and the gravity sensing device locks the locking disc when detecting that the vehicle acceleration reaches a threshold value, so as to prevent the safety belt from being pulled out of the safety belt retractor, and the stable locking piece is fixedly connected with the gravity sensing device;

[0007] The retractor further comprises a friction clutch, a plurality of elastic protrusions are formed on one side of the friction clutch close to the locking disc, the elastic protrusions abut against the locking disc, so that the locking disc drives the friction clutch to rotate synchronously when the locking disc rotates, and a clamping portion is formed on the side of the friction clutch away from the locking disc and extends to the stable locking piece;

[0008] Wherein, when the safety belt is pulled out, the reel, the locking disc and the friction clutch rotate, and the clamping portion cooperates with the stable locking piece, so as to limit the rotation of the gravity sensing device.

[0009] Preferably, the locking disc comprises a circular bottom wall fixedly connected with the other end of the reel and a vertical arm extending away from the reel in the circumferential direction of the circular bottom wall, the friction clutch further comprises an arc-shaped main body portion connected with the elastic protrusions and the clamping portion respectively, the arc-shaped main body portion is arranged along at least one half of the vertical arm, and the elastic protrusions extend from the arc-shaped main body portion and elastically abut against the inner side of the vertical arm.

[0010] Preferably, the arc-shaped main body portion comprises a normal portion extending radially outward from the locking disc and an axial portion adjacent to the inner side of the vertical arm, the elastic protrusions are connected with the axial portion, the clamping portion is connected with the normal portion, and the normal portion and the axial portion are respectively frictionally matched with the top surface and the side surface of the vertical arm.

[0011] Preferably, the vertical arm is provided with an annular embedding groove extending radially outward from the locking disc, and the end of the elastic protrusion extends to form an end protrusion close to the annular embedding groove, and the end protrusion elastically abuts in the annular embedding groove.

[0012] Preferably, the surface of the end protrusion close to the annular embedding groove forms an arc-shaped structure, and the radius of the arc-shaped structure is smaller than the radius of the annular embedding groove.

[0013] Preferably, the arc-shaped main body portion is a closed annular structure.

[0014] Preferably, the elastic protrusions are at least provided with three groups, and the elastic protrusions are uniformly distributed on the friction clutch.

[0015] Preferably, the locking part comprises a pressing head, a first engaging tooth is arranged on one side of the pressing head close to the stable locking piece, a second engaging tooth is arranged on the stable locking piece and matched with the first engaging tooth, and the first engaging tooth and the second engaging tooth are engaged when the locking part is matched with the stable locking piece.

[0016] Preferably, the gravity sensing device comprises a first gravity sensing block, a second gravity sensing block, a first locking piece, a second locking piece, a mechanical sensing seat and a sensing cover plate.

[0017] The stable locking piece is fixedly connected with the mechanical sensing seat.

[0018] The sensing cover plate is arranged opposite to the support in a fixed manner, the pivot shaft is arranged on the sensing cover plate, and the mechanical sensing seat is rotatably connected with the sensing cover plate through the pivot shaft.

[0019] The first gravity sensing block is connected at the bottom of the mechanical sensing seat, the second gravity sensing block is placed at the top of the mechanical sensing seat, the first locking piece is rotatably connected with the mechanical sensing seat and corresponds to the second gravity sensing block, the second locking piece is rotatably connected with the sensing cover plate and corresponds to the first locking piece, the second locking piece corresponds to the locking disc, the second gravity sensing block drives the first locking piece to rotate when detecting that the vehicle acceleration reaches a threshold value, the first locking piece drives the second locking piece to rotate through the driving action of the second gravity sensing block, and the second locking piece locks the locking disc through the driving action of the first locking piece.

[0020] Preferably, a clamping groove at the top of the first gravity sensing block is inserted and fixed with an insertion block at the bottom of the mechanical sensing seat.

[0021] The second gravity sensing block is arranged in a conical shape, and is placed in a conical surface or a circular surface at the top of the mechanical sensing seat.

[0022] Compared with the prior art, the above at least one technical solution adopted by the embodiments of the present specification can achieve at least the following beneficial effects:

[0023] The application can be installed in the seat backrest, meets the locking requirement of the seat backrest angle adjustment retractor at different angles, and ensures that the webbing can be freely pulled out and recovered at different large-angle backrest angles. The friction clutch is provided with an elastic protruding part which abuts against the locking disc, so as to ensure that the locking disc can drive the friction clutch to rotate synchronously. The point-surface contact between the friction clutch and the locking disc can ensure the reliability of the contact and the consistency of the friction force. The clamping part on the friction clutch cooperates with the stable locking piece of the gravity sensing device. When the safety belt is pulled out, the clamping part cooperates with the stable locking piece, so as to limit the rotation of the gravity sensing device, and the locking of the gravity sensing device of the large-angle adjustment can be flexibly switched. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Fig. 1 is an exploded structural schematic diagram of the safety belt retractor provided by the present application;

[0026] Fig. 2 is a structural schematic diagram of the safety belt retractor provided by the present application when the clamping part cooperates with the stable locking piece;

[0027] Fig. 3 is a sectional view at C-C in Fig. 2;

[0028] Fig. 4 is a structural schematic diagram of the friction clutch of the safety belt retractor provided by the present application;

[0029] Fig. 5 is an enlarged structural schematic diagram at A in Fig. 4;

[0030] Fig. 6 is a sectional view of the safety belt retractor provided by the present application;

[0031] Fig. 7 is an enlarged structural schematic diagram at B in Fig. 6;

[0032] Fig. 8 is a structural schematic diagram of the end protrusion embedded in the annular embedding groove of the safety belt retractor provided by the present application;

[0033] Fig. 9 is an enlarged structural schematic diagram of the end protrusion in Fig. 8.

[0034] In the figure, 1, coil spring; 2, reel; 3, support; 4, locking disc; 41, circular bottom wall; 42, vertical arm; 43, annular embedding groove; 5, friction clutch; 51, elastic protrusion; 511, end protrusion; 52, locking part; 53, arc-shaped main body; 531, normal part; 532, axial part; 6, mechanical induction assembly; 61, first gravity induction block; 62, first locking piece; 63, second gravity induction block; 64, second locking piece; 65, mechanical induction seat; 66, induction cover plate; 67, stable locking piece; 7, mechanical side cover. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in detail below with reference to the drawings.

[0036] The above and other aspects of the present application will become more apparent by describing in detail the embodiments thereof with reference to the attached drawings in which:

[0037] It is to be understood that the embodiments described herein are merely illustrative of the principles of this application. Numerous modifications and adaptions thereof will be readily apparent to those skilled in the art without departing from the spirit and scope of the present application as defined by the following claims.

[0038] It is also to be understood that the following description is only illustrative of the aspects of the present application and that no limitation of the scope of the application is intended by the description. It is further understood that the aspects of the present application described herein can be implemented in any of numerous ways, as will be apparent to those skilled in the art. It is to be understood that specific examples, and illustrative implementations, although indicating preferred embodiments of the application, are shown by way of example only and not by way of limitation.

[0039] Also in the following description, specific details are provided to thoroughly understand examples. However, one of ordinary skill in the art will appreciate that the aspects described can be practiced without these specific details.

[0040] At present, most of the traditional retractor only has a single installation angle mechanical locking structure, and a small number of retractors in the market can meet multiple installation angles, but the locking performance will decrease at different angles (backrest adjustment), and a set of mechanical sensing parts stabilizing device needs to be added to ensure the stability of the locking sensing seat. The locking sensing seat needs to be fixed and non-fixed mechanical movement in the mechanical stabilizing device. In the fixed state, the locking performance can be guaranteed, and in the non-fixed state, the multi-angle adjustment can be guaranteed.

[0041] The inventor has designed a safety belt retractor after extensive and in-depth experiments.

[0042] The technical solutions provided by the embodiments of the present application are described below with reference to the drawings.

[0043] As shown in FIGS. 1-3, a safety belt retractor is mounted on a seat backrest, and the retractor can be installed in the seat backrest to meet the locking requirements of the retractor at different angles during adjustment of the seat backrest angle and to ensure that the belt can be freely pulled out and retracted at different large backrest angles. The retractor includes a reel shaft 2 assembly and a mechanical sensing assembly 6.

[0044] The reel shaft 2 assembly includes a winding spring 1, a reel shaft 2, a bracket 3, and a locking disc 4. The reel shaft 2 is rotatably fixed inside the bracket 3. The winding spring 1 is fixed on one side outside the bracket 3. The winding spring 1 is fixedly connected to one end of the reel shaft 2, and the winding spring 1 always provides a winding force for the reel shaft 2 to retract the safety belt. The locking disc 4 is fixedly connected to the other end of the reel shaft 2, and the locking disc 4 is placed on the other side outside the bracket 3.

[0045] The reel 2 assembly further comprises a pawl and a mechanical side cover 7, the pawl, the locking disc 4 and the mechanical side cover 7 constitute a locking part. The bracket 3 is fixedly arranged opposite to the seat back, the reel 2 is rotatably arranged in the bracket 3, the reel spring 1 is fixed on one side of the bracket 3, the mechanical side cover 7 is fixed on the other side of the bracket 3, the reel spring 1 is fixed with one end of the reel 2, and the reel spring 1 provides the reel 2 with a winding force for recovering the safety belt, so that the reel 2 winds the safety belt by using the winding force, and the safety belt can be a woven belt. The mechanical side cover 7 is rotatably connected with the other end of the reel 2, and provides part of the rotating support for the reel 2, and the reel spring 1 is arranged opposite to the mechanical side cover 7. The locking disc 4 is also fixed with the other end of the reel 2, and the locking disc 4 is arranged in the mechanical side cover 7 on the other side of the bracket 3. The reel 2 and the locking disc 4 can rotate through the axial fixation of the reel spring 1 and the mechanical side cover 7, the pawl is movably connected with the reel 2, and the pawl can be engaged with the teeth on the bracket 3 under the inertial force of the reel 2. Therefore, the reel 2 part of the retractor can realize the function of winding the woven belt, and the locking part can ensure that the pawl on the reel 2 can be engaged with the teeth on the bracket 3.

[0046] The mechanical sensing assembly 6 comprises a gravity sensing device and a stable locking piece 67, the gravity sensing device is rotatably fixed on the bracket 3 through a pivot shaft, the gravity sensing device can rotate around the pivot shaft under the action of its own gravity and keep vertical, and the gravity sensing device locks the locking disc 4 when detecting that the vehicle acceleration reaches a threshold value, so as to prevent the safety belt from being pulled out of the safety belt retractor, and the stable locking piece 67 is fixedly connected with the gravity sensing device. The threshold value can be a set or specified threshold value. For example, when adjusting the angle of the seat back, the gravity sensing device rotates relative to the seat back under the action of its own gravity, so that the gravity sensing device keeps vertical. Therefore, the mechanical sensing assembly 6 with large-angle adjustment can meet the requirements of the retractor installed in the seat back with large-angle adjustment and the locking requirements of the retractor at different angles during the angle adjustment of the seat back.

[0047] The retractor further comprises a friction clutch 5, the friction clutch 5 extends to form a plurality of elastic protrusions 51 on one side close to the locking disc 4, the elastic protrusions 51 abut against the locking disc 4, so that the locking disc 4 drives the friction clutch 5 to rotate synchronously when the locking disc 4 rotates, and the friction clutch 5 extends to form a clamping portion 52 at the stable locking piece 67 on the side away from the locking disc 4.

[0048] The safety belt drives the reel 2, the locking disc 4 and the friction clutch 5 to rotate when the safety belt is pulled out, and then the clamping portion 52 cooperates with the stable locking piece 67, so as to limit the rotation of the gravity sensing device.

[0049] By setting the friction clutch 5, the side of the friction clutch 5 close to the locking disc 4 is provided with an elastic protruding part 51 abutting against the locking disc 4, so that there is a certain friction force between the elastic protruding part 51 and the locking disc 4, to ensure that the locking disc 4 can drive the friction clutch 5 to rotate synchronously when the locking disc 4 rotates. The point and surface contact between the friction clutch 5 and the locking disc 4 can ensure the reliability of the contact and the consistency of the friction force.

[0050] By setting the clamping part 52 on the friction clutch 5 cooperating with the stable locking piece 67 of the gravity sensing device:

[0051] When the safety belt is pulled out, the reel 2 drives the locking disc 4 to move, and the locking disc 4 drives the friction clutch 5 to rotate through the friction force between the elastic protruding part 51, and the friction clutch 5 drives the clamping part 52 to rotate towards the direction close to the stable locking piece 67, so that the clamping part 52 cooperates with the stable locking piece 67, thereby limiting the rotation of the gravity sensing device, and the locking of the gravity sensing device can be flexibly switched to large angle adjustment.

[0052] When the safety belt is retracted, the reel 2 drives the friction clutch 5 to move through the locking disc 4, and the friction clutch 5 drives the clamping part 52 to rotate away from the stable locking piece 67, and the clamping part 52 is separated from the stable locking piece 67 to release the gravity sensing device.

[0053] It should be noted that when the clamping part 52 cooperates with the stable locking piece 67, if the safety belt needs to be pulled out continuously, at this time the stable locking piece 67 restricts the movement of the clamping part 52, so that the friction clutch 5 cannot rotate synchronously with the locking disc 4. Since the elastic protruding part 51 and the locking disc 4 are in abutment with each other, the locking disc 4 can rotate independently relative to the friction clutch 5, and will not affect the continuous pulling out of the safety belt.

[0054] As shown in FIG. 1-7, in some embodiments, the locking disc 4 comprises a circular bottom wall 41 fixedly connected with the other end of the reel 2 and a vertical arm 42 extending away from the reel 2 at the circumference of the circular bottom wall 41, the outer side of the vertical arm 42 is provided with a ratchet which cooperates with the gravity sensing device to realize the contact connection between the locking disc 4 and the gravity sensing device, the friction clutch 5 further comprises an arc-shaped main body 53 connected with the elastic protruding part 51 and the locking part 52 respectively, the arc-shaped main body 53 is arranged along at least one half of the vertical arm 42, the elastic protruding part 51 extends from the arc-shaped main body 53 and elastically abuts against the inner side of the vertical arm 42, the locking disc 4 comprises the circular bottom wall 41 fixedly connected with the reel 2 to ensure that the reel 2 drives the locking disc 4 to rotate when the reel 2 rotates, and the vertical arm 42 extending from the bottom wall towards the friction clutch 5, the arc-shaped main body 53 of the friction clutch 5 is arranged along at least one half of the vertical arm 42, so that the elastic protruding part 51 extending from the arc-shaped main body 53 can abut against the opposite sides of the inner side of the vertical arm 42, ensuring that the elastic protruding part 51 can be clamped in the inner side of the vertical arm 42, avoiding the separation between the friction clutch 5 and the vertical arm 42.

[0055] As shown in FIG. 4-7, in some embodiments, the arc-shaped main body 53 comprises a normal part 531 extending radially outwardly from the locking disc 4 and an axial part 532 adjacent to the inner side of the vertical arm 42, the elastic protruding part 51 is connected with the axial part 532, and the locking part 52 is connected with the normal part 531, the normal part 531 and the axial part 532 are respectively frictionally matched with the top surface and the side surface of the vertical arm 42, the arc-shaped main body 53 comprises the normal part 531 and the axial part 532, when the friction clutch 5 is installed on the locking disc 4, the normal part 531 is in frictional contact with the top surface of the vertical arm 42, and the axial part 532 is in frictional contact with the inner side surface of the vertical arm 42, which can further increase the friction force between the friction clutch 5 and the locking disc 4, ensuring that the locking disc 4 can drive the friction clutch 5 to rotate synchronously when the locking disc 4 rotates.

[0056] It should be noted that the normal part 531 is at least partially in close contact with the top surface of the vertical arm 42, ensuring that the normal part 531 and the top surface of the vertical arm 42 have a certain friction force, and the axial part 532 is at least partially in close contact with the inner side surface of the vertical arm 42, ensuring that the axial part 532 and the inner side surface of the vertical arm 42 have a certain friction force.

[0057] As shown in FIGS. 6-8, in some embodiments, the upright arm 42 is provided with an annular groove 43 extending radially outward from the locking disc 4, and the end of the elastic protrusion 51 extends to form an end protrusion 511 close to the annular groove 43, which elastically abuts in the annular groove 43. By providing the annular groove 43 on the upright arm 42, and the end of the elastic protrusion 51 extending to form the end protrusion 511 into the annular groove 43, the end protrusion 511 is at least partially embedded in the annular groove 43, and the end protrusion 511 and the annular groove 43 are in interference fit, which ensures the stability of the friction clutch 5 after being installed on the locking disc 4. When the end protrusion 511 is embedded in the annular groove 43, it will be deformed to some extent, and the elastic embedding of the end protrusion 511 in the annular groove 43 generates a positive pressure between the end protrusion 511 and the inner wall of the annular groove 43, so that the end protrusion 511 and the annular groove 43 have a larger friction force, which ensures that the locking disc 4 can drive the friction clutch 5 to rotate synchronously when the locking disc 4 rotates.

[0058] It should be noted that in other embodiments, the groove can also be a groove formed by several arc segments, and the groove formed by several arc segments is an annular groove 43 with a middle barrier.

[0059] As shown in FIGS. 6-9, in some embodiments, the surface of the end protrusion 511 close to the annular groove 43 forms an arc structure, and the radius of the arc structure is smaller than the radius of the annular groove 43. The outer end of the end protrusion 511 forms an arc structure, and the radius of the arc structure is smaller than the radius of the annular groove 43, so that only the outermost end of the arc structure is in contact with the inner wall of the annular groove 43, and the arc structure and the inner wall of the annular groove 43 are always in point-face contact, which ensures the reliability of the contact and the consistency of the friction force. The point-face contact is more stable and reliable than the line-face contact or the face-face contact.

[0060] As shown in FIG. 4, in some embodiments, the arc-shaped main body 53 is a closed annular structure, which ensures that the plurality of elastic protrusions 51 are distributed in a ring shape, thereby ensuring that the locking disc 4 can rotate independently relative to the plurality of elastic protrusions 51.

[0061] It should be noted that the upright arm 42 is also a closed annular structure, which ensures that the arc-shaped main body 53 can cooperate with the upright arm 42. The normal part 531 of the arc-shaped main body 53 can always tightly adhere to the top surface of the upright arm 42 at least partially, and the axial part 532 of the arc-shaped main body 53 can always tightly adhere to the inner side surface of the upright arm 42 at least partially.

[0062] As shown in FIG. 1 and FIG. 4, in some embodiments, the elastic protrusions 51 are provided in at least three groups, which are uniformly distributed on the friction clutch 5. By providing at least three groups of elastic protrusions 51 uniformly distributed on the friction clutch 5, it is ensured that there are at least three places in contact with the inner side of the vertical arm 42. The three groups of elastic protrusions 51 can determine a ring, which ensures the contact effect between the elastic protrusions 51 and the vertical arm 42, thereby ensuring the friction between the elastic protrusions 51 and the locking disc 4.

[0063] As shown in FIG. 1-2, in some embodiments, the locking part 52 includes a pressure head, which is provided with a first engagement tooth near one side of the stable locking piece 67, and the stable locking piece 67 is provided with a second engagement tooth matched with the first engagement tooth. When the locking part 52 cooperates with the stable locking piece 67, the first engagement tooth and the second engagement tooth are engaged. By providing the first engagement tooth on the pressure head and the second engagement tooth on the side of the stable locking piece 67 close to the pressure head, when the safety belt is pulled out, the pressure head rotates a certain angle with the friction clutch 5, the first engagement tooth and the second engagement tooth are engaged, and the pressure head fixes the stable locking piece 67, thereby realizing the locking of the gravity sensing device.

[0064] It should be noted that by providing an independent pressure head structure, which can be modularly installed in the retractor, different locking angle mechanical sensing devices can be modularized to adapt to the installation angle of the retractor.

[0065] It should be further noted that the stable locking piece 67 is a fan-shaped piece, and the second engagement tooth is provided on the outer side of the arc-shaped edge of the stable locking piece 67.

[0066] As shown in FIG. 1-2, in some embodiments, the gravity sensing device includes a first gravity sensing block 61, a second gravity sensing block 63, a first locking piece 62, a second locking piece 64, a mechanical sensing seat 65, and a sensing cover plate 66.

[0067] The stable locking piece 67 is fixedly connected to the mechanical sensing seat 65.

[0068] The sensing cover plate 66 is fixedly arranged opposite to the support 3, the pivot shaft is arranged on the sensing cover plate 66, and the mechanical sensing seat 65 is rotatably connected to the sensing cover plate 66 through the pivot shaft.

[0069] The first gravity sensing block 61 is connected at the bottom of the mechanical sensing seat 65; the second gravity sensing block 63 is placed at the top of the mechanical sensing seat 65; the first locking piece 62 is rotationally connected to the mechanical sensing seat 65, and the first locking piece 62 corresponds to the second gravity sensing block 63; the second locking piece 64 is rotationally connected to the sensing cover plate 66, and the second locking piece 64 corresponds to the first locking piece 62; the second locking piece 64 corresponds to the locking disc 4; the sensing cover plate 66 is fixedly connected with the support 3, and the pivot shaft is fixedly connected with the sensing cover plate 66. The first gravity sensing block 61 drives the mechanical sensing seat 65, the stable locking piece 67, the second gravity sensing block 63 and the first locking piece 62 to rotate in the vertical direction under the action of its own gravity; the second gravity sensing block 63 drives the first locking piece 62 to rotate when detecting that the vehicle acceleration reaches a threshold value, and the first locking piece 62 drives the second locking piece 64 to rotate through the driving action of the second gravity sensing block 63; the second locking piece 64 locks the locking disc 4 through the driving action of the first locking piece 62. Through the mechanical sensing assembly 6, the locking function in multiple angles can be sensed.

[0070] As shown in FIG. 1, in some embodiments, the clamping groove at the top of the first gravity sensing block 61 is inserted and fixed with the plug-in block at the bottom of the mechanical sensing seat 65, forming a stable fixed relationship. The first gravity sensing block 61 can be circular or spindle-shaped, and the first gravity sensing block 61 can be a metal material.

[0071] The second gravity sensing block 63 is conical, and the second gravity sensing block 63 is placed in the conical surface or the circular surface at the top of the mechanical sensing seat 65. The second gravity sensing block 63 can be a conical metal material. The two protruding cylinders on the first locking piece 62 can cooperate with the round holes on the mechanical sensing seat 65 to rotate. The round holes on the second locking piece 64 can cooperate with the cylinders of the sensing cover plate 66 to rotate.

[0072] The same and similar parts among the various embodiments in the specification can be referred to each other, and each embodiment focuses on the difference from other embodiments. Especially, for the method embodiments described later, since they correspond to the system, the description is relatively simple, and the related parts can be referred to the part of the system embodiment.

[0073] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A seat belt retractor, the retractor being mounted on a seat back, the retractor comprising a reel assembly and a mechanical sensing assembly; the reel assembly comprising a reel spring, a reel, a bracket and a locking disc, the reel being rotatably fixed inside the bracket, the reel spring being fixed on one side outside the bracket, the reel spring being fixedly connected with one end of the reel, and the reel spring always providing a winding force for the reel to retract the seat belt, the locking disc being fixedly connected with the other end of the reel, and the locking disc being disposed on the other side outside the bracket; the mechanical sensing assembly comprising a gravity sensing device and a stabilizing locking piece, the gravity sensing device being rotatably fixed on the bracket through a pivot shaft, the gravity sensing device being able to rotate around the pivot shaft under the action of its own gravity and keep a vertical state, and the gravity sensing device locking the locking disc when detecting that the vehicle acceleration reaches a threshold value, so as to prevent the seat belt from being pulled out of the seat belt retractor, the stabilizing locking piece being fixedly connected with the gravity sensing device; characterized in that the retractor further comprising a friction clutch, the friction clutch extending to form a plurality of elastic protrusions on one side close to the locking disc, the elastic protrusions abutting against the locking disc, so that the locking disc drives the friction clutch to rotate synchronously when the locking disc rotates, and the friction clutch extending to form a locking portion on the side away from the locking disc and extending to the stabilizing locking piece; wherein the seat belt drives the reel, the locking disc and the friction clutch to rotate when the seat belt is pulled out, and the locking portion cooperates with the stabilizing locking piece, so as to limit the rotation of the gravity sensing device.

2. The seat belt retractor of claim 1 wherein, the locking disc comprising a circular bottom wall fixedly connected with the other end of the reel and a vertical arm extending away from the reel in the circumferential direction of the circular bottom wall, the friction clutch further comprising an arc-shaped main body portion connected with the elastic protrusions and the locking portion respectively, the arc-shaped main body portion being disposed along at least one half of the vertical arm, and the elastic protrusions extending from the arc-shaped main body portion and elastically abutting against the inner side of the vertical arm.

3. The seat belt retractor of claim 2 wherein, the arc-shaped main body portion comprising a normal portion extending radially outward from the locking disc and an axial portion adjacent to the inner side of the vertical arm, the elastic protrusions being connected with the axial portion, and the locking portion being connected with the normal portion, the normal portion and the axial portion being frictionally matched with the top surface and the side surface of the vertical arm respectively.

4. The seat belt retractor of claim 3 wherein, the vertical arm being provided with an annular embedding groove extending radially outward from the locking disc, and the end of the elastic protrusion extending to form an end protrusion close to the annular embedding groove, the end protrusion elastically abutting in the annular embedding groove.

5. The seat belt retractor of claim 3 wherein, the surface of the end protrusion close to the annular embedding groove forms an arc-shaped structure, and the radius of the arc-shaped structure is smaller than the radius of the annular embedding groove.

6. The seat belt retractor according to any one of claims 2-5, wherein, the arc-shaped main body portion is a closed annular structure.

7. The seat belt retractor of claim 6 wherein, the elastic protrusions are provided with at least three groups, and the elastic protrusions are uniformly distributed on the friction clutch.

8. The seat belt retractor according to any one of claims 1-5, wherein The locking part comprises a pressure head, a first engaging tooth is arranged on one side of the pressure head close to the stable locking piece, a second engaging tooth matched with the first engaging tooth is arranged on the stable locking piece, and the first engaging tooth and the second engaging tooth are engaged when the locking part is matched with the stable locking piece.

9. The seat belt retractor according to any one of claims 1-5, wherein, The gravity sensing device comprises a first gravity sensing block, a second gravity sensing block, a first locking piece, a second locking piece, a mechanical sensing seat and a sensing cover plate. The stable locking piece is fixedly connected with the mechanical sensing seat. The sensing cover plate is fixedly arranged opposite to the support, the pivot shaft is arranged on the sensing cover plate, and the mechanical sensing seat is rotatably connected with the sensing cover plate through the pivot shaft. The first gravity sensing block is connected at the bottom of the mechanical sensing seat. The second gravity sensing block is placed at the top of the mechanical sensing seat, the first locking piece is rotatably connected with the mechanical sensing seat, and the first locking piece corresponds to the second gravity sensing block, the second locking piece is rotatably connected with the sensing cover plate, and the second locking piece corresponds to the first locking piece, the second locking piece corresponds to the locking disc, the second gravity sensing block drives the first locking piece to rotate when detecting that the vehicle acceleration reaches a threshold value, the first locking piece drives the second locking piece to rotate through the driving action of the second gravity sensing block, and the second locking piece locks the locking disc through the driving action of the first locking piece.

10. The seat belt retractor of claim 9 wherein, The clamping groove at the top of the first gravity sensing block is inserted and fixed with the plug-in block at the bottom of the mechanical sensing seat. The second gravity sensing block is arranged in a conical shape, and is placed in a conical surface or a circular surface at the top of the mechanical sensing seat.

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