A spring-type clutch assembly and a seat belt retractor

Abstract

The present invention discloses a spring-type clutch assembly and a seat belt retractor, wherein a locking mechanism is arranged between a main gear and a clutch fixing plate, one end of a one-way clutch spring is connected to the clutch fixing plate, and the other end of the one-way clutch spring is connected to a clutch base; when the main gear rotates forward relative to the clutch fixing plate, the locking mechanism is pushed to a state of contact and meshing with a transmission wheel; when the main gear rotates reversely relative to the clutch fixing plate, the locking mechanism is pushed to a state of disengagement from the transmission wheel; when the clutch fixing plate drives the one-way clutch spring to rotate forward, the friction force between the one-way clutch spring and the clutch base gradually increases; when the clutch fixing plate drives the one-way clutch spring to rotate reversely, the friction force between the one-way clutch spring and the clutch base gradually decreases. Effect: The one-way locking performance of the transmission wheel driven by the main gear rotation is improved, and extremely high motion synchronization between the main gear and the clutch fixing plate is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle safety belts, in particular to a spring-type clutch assembly and a safety belt retractor. Background Art

[0002] The existing seat belt retractor can provide protection for the driver before a collision. The active seat belt retractor driven by a motor can retract a certain amount of seat belt by the motor before a possible collision of the vehicle, thereby protecting the driver.

[0003] The motor of the seat belt retractor has a small output torque. The existing clutch used for the seat belt retractor is mainly a tooth clutch. This clutch has problems such as large clutch delay, lack of synchronization of internal and external teeth, and large impact vibration and noise during use; there is a lack of a clutch component with good synchronization performance, simple structure and good stability. Summary of the invention

[0004] To this end, the present invention provides a spring type clutch assembly to solve the problem of poor synchronization performance of the clutch assembly in the motor driven seat belt retractor in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] According to a first aspect of the present invention, a spring-type clutch assembly comprises a main gear, a locking mechanism, a transmission wheel, a clutch fixing plate, a one-way clutch spring and a clutch base; a locking mechanism is arranged between the main gear and the clutch fixing plate, a one-way clutch spring is arranged between the clutch base and the clutch fixing plate, one end of the one-way clutch spring is connected to the clutch fixing plate, and the other end of the one-way clutch spring is connected to the clutch base; when the main gear rotates forwardly relative to the clutch fixing plate, the locking mechanism is pushed to a state of contact and engagement with the transmission wheel; when the main gear rotates reversely relative to the clutch fixing plate, the locking mechanism is pushed to a state of disengagement from the transmission wheel; the inner ring of the one-way clutch spring contacts the clutch base to generate friction force, providing friction force for the clutch fixing plate to rotate relative to the clutch base; when the clutch fixing plate drives the one-way clutch spring to rotate forwardly, the friction force between the one-way clutch spring and the clutch base gradually increases; when the clutch fixing plate drives the one-way clutch spring to rotate reversely, the friction force between the one-way clutch spring and the clutch base gradually decreases.

[0007] Furthermore, the one-way clutch spring is a spiral steel wire structure, and a clutch spring extension end is provided at one end of the spiral steel wire constituting the one-way clutch spring. An annular protrusion is provided on the end surface of the clutch fixing plate which is away from the locking mechanism. The one-way clutch spring is embedded in the annular protrusion, and a clutch spring slot is provided in the inner circle of the annular protrusion. The clutch spring extension end is inserted into the clutch spring slot.

[0008] Furthermore, the width of the clutch spring slot is greater than the diameter of the extended end of the clutch spring.

[0009] Furthermore, there are multiple clutch spring retaining grooves, and the multiple clutch spring retaining grooves are arranged in a circular array with equal intervals around the axis of the clutch fixing plate.

[0010] Furthermore, an annular friction portion is provided on the side of the clutch base close to the clutch fixing plate, and the inner ring of the one-way clutch spring is sleeved on the outer peripheral side of the annular friction portion; when the clutch fixing plate drives the extended end of the clutch spring to rotate in the forward direction, the friction force between the inner ring of the one-way clutch spring and the outer peripheral side of the annular friction portion gradually increases; when the clutch fixing plate drives the extended end of the clutch spring to rotate in the reverse direction, the friction force between the inner ring of the one-way clutch spring and the outer peripheral side of the annular friction portion gradually decreases, and the annular friction portion is sleeved on the outer peripheral side of one end of the core shaft assembly of the seat belt retractor.

[0011] Furthermore, the inner ring of the one-way clutch spring is interference-fitted with the outer peripheral side of the annular friction portion.

[0012] Furthermore, the extending direction of the extended end of the clutch spring is the radial direction of the one-way clutch spring.

[0013] Furthermore, the spiral steel wire structure of the one-way clutch spring is an equal-pitch spiral curve, and the pitch of the one-way clutch spring is equal to the diameter of the steel wire constituting the one-way clutch spring.

[0014] Furthermore, the locking mechanism includes a plurality of locking blocks, which are arranged in a circular array with equal intervals around the axis of the transmission wheel, one end of the locking block is rotatably connected to the clutch fixing plate, and the other end of the locking block is slidably connected to the main gear; when the main gear rotates forward, the plurality of locking blocks are pushed to engage with the transmission wheel; when the main gear rotates reversely, the plurality of locking blocks are disengaged from the engagement with the transmission wheel.

[0015] According to a second aspect of the present invention, a seat belt retractor comprises the spring clutch assembly according to any one of the first aspect of the present invention.

[0016] The present invention has the following advantages: the inner circle of the one-way clutch spring of the present invention is reduced and contacts the clutch base or the clutch fixing plate to generate friction force, which significantly improves the one-way locking performance of the transmission wheel driven by the locking mechanism when the main gear rotates, and achieves extremely high movement synchronization between the main gear and the clutch fixing plate. The spring-type clutch assembly has a simple structure and good stability, and significantly improves the clutch effect of the seat belt retractor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a clutch torque plate of a friction plate clutch assembly according to some embodiments of the present invention.

[0018] Figure 2The exploded structure diagram of a friction plate clutch assembly according to some embodiments of the present invention.

[0019] Figure 3 The present invention is a front view of a friction plate clutch assembly according to some embodiments of the present invention.

[0020] Figure 4 Detailed description of the invention The present invention is a cross-sectional view of a friction plate clutch assembly according to some embodiments of the present invention.

[0021] Figure 5 Exploded structural diagrams of a friction plate clutch assembly according to other embodiments of the present invention.

[0022] Figure 6 An exploded structural diagram of a spring clutch assembly according to some embodiments of the present invention.

[0023] Figure 7 A plan view of a spring clutch assembly according to some embodiments of the present invention.

[0024] Figure 8 This is a structural diagram of a clutch stator of a spring-type clutch assembly according to some embodiments of the present invention.

[0025] Fig. 9 This is a structural diagram of a one-way clutch spring of a spring-type clutch assembly according to some embodiments of the present invention.

[0026] Fig.10 This is a front structural diagram of a locking mechanism of the first solution of some embodiments of the present invention.

[0027] Fig.11 This is a structural diagram of a locking block of a locking mechanism according to a first solution of some embodiments of the present invention.

[0028] Fig.12 This is a structural diagram of a locking mechanism return spring according to a first solution of some embodiments of the present invention.

[0029] Fig.13 This is a structural diagram of a clutch fixing plate of a locking mechanism according to a first solution of some embodiments of the present invention.

[0030] Fig.14 This is a structural diagram of a locking plate of a locking mechanism according to a first solution of some embodiments of the present invention.

[0031] Fig.15 This is an exploded structural diagram of a locking mechanism according to the second solution of some embodiments of the present invention.

[0032] Fig.16 This is a partial front cross-sectional view of a locking mechanism according to the second solution of some embodiments of the present invention.

[0033] Fig.17This is a structural diagram of a main gear of a locking mechanism according to the second solution of some embodiments of the present invention.

[0034] Fig.18 This is a structural diagram of a locking block of a locking mechanism according to the second solution of some embodiments of the present invention.

[0035] Fig.19 It is a schematic diagram of the overall structure of a motor-driven seat belt retractor according to some embodiments of the present invention;

[0036] Fig. 20 A schematic diagram of a transmission structure of a motor drive structure for a safety belt in some embodiments of the present invention;

[0037] Fig.21 A schematic diagram of a transmission structure of a motor drive structure for a safety belt according to some embodiments of the present invention (without the planetary carrier gear);

[0038] Fig. 22 A schematic diagram of a transmission structure of a motor drive structure for a safety belt according to some embodiments of the present invention (with a base);

[0039] Fig.23 A schematic diagram of the structure of a main gear in some embodiments of the present invention;

[0040] Fig.24 A schematic diagram of the structure of a stepped gear in some embodiments of the present invention;

[0041] Fig.25 A schematic diagram of a transmission structure of a high-torque motor drive structure for a safety belt according to some embodiments of the present invention;

[0042] Fig.26 A schematic diagram of a high-torque motor drive structure for a seat belt in some embodiments of the present invention;

[0043] Fig. 27 A schematic diagram of a high-torque motor drive structure for a seat belt according to some embodiments of the present invention (without the secondary transmission gear);

[0044] Fig.28 It is a schematic structural diagram of an eccentric structural assembly in some embodiments of the present invention;

[0045] Fig.29 A schematic diagram of an exploded structure of a seat belt retractor according to some embodiments of the present invention;

[0046] Fig.30 It is a structural schematic diagram of a seat belt retractor according to some embodiments of the present invention (without the outer cover);

[0047] Fig.31 It is a schematic structural diagram of a coil spring cover plate in some embodiments of the present invention;

[0048] Fig.32 A schematic diagram of a trigger structure for a safety belt in a trigger state in some embodiments of the present invention;

[0049] Fig.33 A schematic diagram of a trigger structure for a safety belt in a non-triggering state in some embodiments of the present invention;

[0050] Fig.34 It is a structural schematic diagram of a shearing assembly for a safety belt in some embodiments of the present invention;

[0051] In the figure: 100, coil spring assembly, 101, coil spring, 102, spring, 103, protrusion, 104, pin hole, 200, speed reduction mechanism assembly, 201, planetary carrier gear assembly, 2011, common planetary gear, 2012, planetary gear internal gear, 2013, base, 20131, first groove, 20132, second groove, 2014, planetary carrier gear, 2015, spline, 2016, cylinder, 202, stepped gear, 2021, driving external gear, 2022, primary driven gear, 203, swing gear assembly, 2031, swing gear, 2032, transmission member, 204, eccentric structure group Parts, 2041, eccentric shaft, 2042, primary transmission gear, 205, secondary transmission gear, 2051, through hole, 206, reduction internal gear, 300, clutch assembly, 301, transmission wheel, 3011, spline groove, 302, locking block, 3021, sliding protrusion, 3022, rotating part, 3023, connecting part, 3024, locking part, 3025, locking pressure-bearing protrusion, 3026, torsion spring slot, 303, clutch fixing plate, 3031, annular protrusion, 3032, limiting protrusion, 3033, limiting slot, 3034, clutch spring slot, 3035, first limiting pin, 3036, torsion spring fixing slot, 3037, second limit pin, 3038, torsion spring support protrusion, 304, clutch torque plate, 3041, inner friction plate, 3042, outer fixing plate, 3043, annular plate, 3044, friction protrusion, 305, clutch base, 3051, outer fixing groove, 3052, inner fixing groove, 3053, annular friction portion, 306, one-way clutch spring, 3061, clutch spring extension end, 307, reset spring, 3071, first leg, 3072, second leg, 308, locking fixing plate, 3081, locking fixing hole, 3082, rotation matching groove, 3083, force-applying pressure surface, 309, clutch support, 3091 , first limiting hole, 3092, second limiting hole, 400, control unit, 500, spindle assembly, 501, pin, 600, motor, 601, driving gear, 700, preloader assembly, 800, mechanical end assembly, 900, main gear, 901, track groove, 902, shock-absorbing spring, 903, outer gear ring, 904, wedge-shaped block, 905, guide chamber, 906, pressure-bearing surface, 907, locking trigger protrusion, 908, force guide surface, 11, outer cover, 12, coil spring cover plate, 121, spring mounting portion, 122, magnet mounting portion, 13, positioning cover plate, 14, Hall sensor, 15, magnet. DETAILED DESCRIPTION

[0052] According to an embodiment of the present invention, a motor-driven seat belt retractor is provided. Figures 1 to 34As shown, it includes a motor 600, a reduction mechanism assembly 200, a main gear 900, a clutch assembly 300 and a spindle assembly 500, wherein the output end of the motor 600 is connected to the reduction mechanism assembly 200, the output end of the reduction mechanism assembly 200 is meshed with the main gear 900, the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, and the spindle assembly 500 is driven to rotate by the motor 600; wherein the output end of the motor 600 is provided with a driving gear 601, the reduction mechanism assembly 200 adopts a planetary gear structure or an eccentric swing gear structure, and the motor 600 is driven by the reduction mechanism assembly 200. The mechanism assembly 200 decelerates and transmits the motion to the main gear 900, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600; when in use, the motor 600 decelerates through the deceleration mechanism assembly 200 and transmits the motion to the main gear 900, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600. When pre-tightening the seat belt, it can be reused, and the forward and reverse rotation of the spindle assembly 500 can be achieved by the forward and reverse rotation of the motor 600.

[0053] In some optional embodiments, the seat belt retractor also includes a coil spring assembly 100, which is arranged on a side of the core shaft assembly 500 close to the clutch assembly 300. The coil spring assembly 100 includes a coil spring cover plate 12 and a coil spring 101. The coil spring 101 is arranged in the coil spring cover plate 12, and the coil spring 101 is connected to the axial end of the core shaft assembly 500. By arranging the coil spring 101, the seat belt wound on the core shaft assembly 500 can be retracted to ensure that the seat belt is always close to the human body; it also includes a control unit 400, which is arranged inside the motor-driven seat belt retractor and is used to control the motor 600 and the clutch assembly 300, such as stopping the rotation of the motor 600; it also includes a pretensioner assembly 700, which is arranged on the outside of the core shaft assembly 500. When an emergency occurs in the vehicle, the core shaft assembly 500 is pre-tightened, and the motor 600 can be used to achieve pre-tightening.

[0054] In some optional embodiments, the driving structure of the seat belt retractor can be a motor driving structure for a seat belt. The planetary gear structure speed reduction mechanism assembly 200 of the first scheme includes a planetary gear assembly 201 and a stepped gear 202. The stepped gear 202 includes a driving outer gear 2021 and a primary driven gear 2022. The driving outer gear 2021 and the primary driven gear 2022 are coaxially arranged as a whole; the driving gear 601 is meshed and connected with the primary driven gear 2022, and the driving outer gear 2021 is connected to the planetary gear assembly 201; when the driving gear 601 rotates, the primary driven gear 2022, the driving outer gear 2021 and the planetary gear assembly 201 are connected ... The outer gear 2021 and the planetary gear assembly 201 make the main gear 900 rotate, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600; by using the motor 600, through the driving gear 601 at the output end of the motor 600, through the primary driven gear 2022, the driving outer gear 2021 and the planetary gear assembly 201, the main gear 900 is rotated, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600, when the seat belt is pre-tightened, The planetary gear assembly 201 further comprises a common planetary gear 2011, which is meshed with the active outer gear 2021, wherein the common planetary gear 2011 is arranged on the circumferential outer side of the active outer gear 2021, and the rotation of the active outer gear 2021 drives the rotation of the common planetary gear 2011; the number of the common planetary gears 2011 is one or more, and when the number of the common planetary gears 2011 is more than one, such as the number of the common planetary gears 2011 can be 3-5, along the active outer gear 2021, the common planetary gears 2011 can be rotated in a rotating direction. The outer gears 2021 are evenly distributed in the circumferential direction, and the number of the common planetary gears 2011 is three; the planetary carrier gear assembly 201 also includes a planetary gear inner gear 2012, which is fixed to the base 2013 of the speed reduction mechanism assembly 200 and connected by a spline 2015, so that when the common planetary gear 2011 rotates, the planetary gear inner gear 2012 is fixed; the planetary carrier gear assembly 201 also includes a planetary carrier gear 2014, which is arranged on the axial side of the planetary gear inner gear 2012 away from the base 2013 and can be meshed and connected with the main gear 900;A cylinder 2016 is provided on the surface of the planetary carrier gear 2014 facing the common planetary gear 2011. The cylinder 2016 is arranged opposite to the axis of the common planetary gear 2011. The cylinder 2016 is inserted at the axis of the common planetary gear 2011. When the common planetary gear 2011 rotates, the cylinder 2016 rotates synchronously with the common planetary gear 2011. The rotation of the cylinder 2016 drives the planetary carrier gear 2014 to rotate. The number of the cylinders 2016 is the same as the number of the common planetary gears 2011, which can be three to five. The specific position of the cylinders 2016 corresponds to the center of the common planetary gear 2011. The motor 600 is a brushed DC motor with a voltage of 12V / 24V / 36V / 48V and a maximum current of 40A. It has the characteristics of fast starting, timely braking, smooth speed regulation in a large range, and a relatively simple control circuit. ;

[0055] In some optional embodiments, the driving structure of the seat belt retractor can also be a high-torque motor driving structure for the seat belt. The eccentric swing gear structure speed reduction mechanism assembly 200 of the second scheme includes a swing gear assembly 203, an eccentric structure assembly 204 and a secondary transmission gear 205. The eccentric structure assembly 204 includes an eccentric shaft 2041 and a primary transmission gear 2042. The eccentric shaft 2041 and the primary transmission gear 2042 are integrally arranged; the driving gear 601 is meshed and connected with the primary transmission gear 2042, the eccentric shaft 2041 is connected with the swing gear assembly 203, and the swing gear assembly 203 is connected with the secondary transmission gear 205; when the driving gear 601 rotates, through the primary transmission gear 2042, The swing gear assembly 203 and the secondary transmission gear 205 make the main gear 900 rotate, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600; when the driving gear 601 rotates, the main gear 900 is rotated through the primary transmission gear 2042, the swing gear assembly 203 and the secondary transmission gear 205, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600. When the seat belt is pre-tightened, it can be reused, and the forward and reverse rotation of the spindle assembly 500 can be achieved by the forward and reverse rotation of the motor 600, and it has the characteristics of simple structure and high transmission torque. point; the eccentric swing gear structure includes a swing gear assembly 203, an eccentric structure assembly 204 and a secondary transmission gear 205, the eccentric structure assembly 204 includes an eccentric shaft 2041 and a primary transmission gear 2042, and the eccentric shaft 2041 and the primary transmission gear 2042 are integrally arranged; the driving gear 601 is meshed and connected with the primary transmission gear 2042, the eccentric shaft 2041 is connected with the swing gear assembly 203, and the swing gear assembly 203 is connected with the secondary transmission gear 205; a plurality of through holes 2051 are provided on the end surface of the secondary transmission gear 205, and the through holes 2051 are evenly distributed around the axis of the secondary transmission gear 205; the swing gear assembly 203 includes a swing gear 2031 and a transmission member 2032, and the transmission member 203 2 is arranged on the surface of the swing gear 2031 facing the secondary transmission gear 205, and the transmission member 2032 is arranged opposite to the through hole 2051; by arranging the transmission member 2032 and the through hole 2051, the rotation of the swing gear 2031 can be transmitted to the rotation of the secondary transmission gear 205, thereby realizing the transmission of motion; the transmission member 2032 is cylindrical, and the diameter of the transmission member 2032 is smaller than the diameter of the through hole 2051; wherein, the transmission member 2032 adopts a cylindrical shape, which can make the entire transmission process smooth, and can increase the contact between the transmission member 2032 and the through hole 2051 compared with the truncated cone shape or the prism shape; the number of the through holes 2051 is 6, and the number of the through holes 2051 is the same as the number of the transmission member 2032;Of course, the number of transmission members 2032 can also be less than the number of through holes 2051, and the transmission of rotation can be achieved. During the transmission process, the transmission member 2032 is inserted into the through hole 2051. During the rotation of the swing gear 2031, the transmission member 2032 is driven to rotate synchronously, thereby driving the secondary transmission gear 205 to rotate; the high-torque motor drive structure for the seat belt also includes a reduction internal gear 206, which is arranged on the circumferential outer side of the swing gear 2031 and meshed with the swing gear 2031; the reduction internal gear 206 is fixed to the base of the speed reduction mechanism assembly 200 with a spline structure; by setting the reduction internal gear 20 6. The deceleration of the speed reduction mechanism assembly 200 is achieved by cooperating with the swing gear 2031; the number of teeth of the speed reduction internal gear 206 is greater than the number of teeth of the swing gear 2031; wherein the number of teeth of the speed reduction internal gear 206 is 36, and the number of teeth of the swing gear 2031 is 32 to 35. The speed reduction of the speed reduction mechanism assembly is achieved by setting a difference in the number of teeth between the speed reduction internal gear 206 and the swing gear 2031; the swing amplitude of the swing gear assembly 203 is not greater than the eccentricity of the eccentric structure assembly 204. The specific relationship between the eccentricity and the swing amplitude is not limited here. In this embodiment, the eccentric structure assembly is used to realize the transmission of motion, and multi-stage deceleration can be achieved during the transmission process. ;

[0056] In some optional embodiments, the first scheme of the clutch assembly 300 of the seat belt retractor is a friction plate clutch assembly, including a main gear 900, a locking mechanism, a transmission wheel 301, a clutch fixing plate 303, a clutch torque plate 304 and a clutch base 305; a locking mechanism is arranged between the main gear 900 and the clutch fixing plate 303, a clutch torque plate 304 is arranged between the clutch base 305 and the clutch fixing plate 303, one end of the clutch torque plate 304 is connected to the clutch fixing plate 303, and the other end of the clutch torque plate 304 is connected to the clutch base 305; when the main gear 900 rotates forward relative to the clutch fixing plate 303, the lock mechanism is arranged between the main gear 900 and the clutch fixing plate 303, and the clutch torque plate 304 is arranged between the clutch base 305 and the clutch fixing plate 303. The locking mechanism is pushed to a state of contact and meshing with the transmission wheel 301; when the main gear 900 rotates in the opposite direction relative to the clutch fixing plate 303, the locking mechanism is pushed to a state of disengagement from the transmission wheel 301; the clutch torque plate 304 provides the friction force required for the main gear 900 to rotate relative to the clutch fixing plate 303 by generating sliding friction force through continuous contact; it should be noted that there are two ways in which the clutch torque plate 304 provides relative friction between the clutch fixing plate 303 and the clutch base 305: one is that the clutch torque plate 304 is fixed on the clutch base 305, and there is a sliding friction force of interference fit between the clutch torque plate 304 and the clutch fixing plate 303 The other is that the clutch torque plate 304 is fixed on the clutch fixing plate 303, and there is sliding friction of interference fit between the clutch torque plate 304 and the clutch base 305; the friction force is generated by the continuous contact of the clutch torque plate 304 with the clutch base 305 or the clutch fixing plate 303 of the present embodiment, which significantly improves the one-way locking performance of the main gear 900 to drive the locking mechanism to realize the transmission wheel 301, and realizes the extremely high movement synchronization between the main gear 900 and the clutch fixing plate 303. The friction plate clutch assembly has a simple structure and good stability, which significantly improves the clutch effect of the seat belt retractor; the locking mechanism includes multiple locks The stop block 302 is arranged in an annular array with equal intervals around the axis of the transmission wheel 301. One end of the lock block 302 is rotatably connected to the clutch fixing plate 303, and the other end of the lock block 302 is slidably connected to the main gear 900; the main gear 900 pushes the lock block 302 to engage with the transmission wheel 301 through a track groove or a guide surface; by setting a plurality of lock blocks 302, the stability of the main gear 900 driving the transmission wheel 301 to rotate simultaneously is significantly improved, and the vibration and noise are significantly reduced during the locking process; the clutch torque plate 304 includes a circular ring plate 3043, an inner friction plate 3041 and an outer fixing plate 3042;The annular plate 3043 is an annular plate-shaped structure. A plurality of inner friction plates 3041 are fixed to the inner ring of the annular plate 3043. A plurality of outer fixing plates 3042 are fixed to the outer ring of the annular plate 3043. Each inner friction plate 3041 is inclined toward one side of the outer fixing plate 3042, thereby generating an interference fit. The annular plate 3043, the inner friction plate 3041 and the outer fixing plate 3042 in this embodiment are an integrally formed structure, and the material thereof is made of wear-resistant material, such as wear-resistant plastic or wear-resistant metal; a friction protrusion 3044 is provided on each inner friction plate 3041, and the friction protrusion 3044 is provided on one side of the inner friction plate 3041 close to the outer fixing plate 3042. The clutch torque plate 304 contacts the clutch base 304 through the friction protrusion 3044. 5 or the clutch fixing plate 303 generates friction by sliding contact; the friction protrusion 3044 is an integral structure formed by stamping or casting on the inner friction plate 3041. The integrally formed structure reduces the material manufacturing cost of the friction protrusion 3044, and the life of the clutch torque plate 304 is significantly extended; the number of inner friction plates 3041 is the same as the number of outer fixing plates 3042, and multiple inner friction plates 3041 are arranged in a uniform annular array around the center of the circular ring plate 3043, and the inner friction plates 3041 and the outer fixing plates 3042 are arranged one by one. For example, there are 8 inner friction plates 3041 and 8 outer friction plates, and the outer fixing plate 3042 is perpendicular to the circular ring plate 3043. The angle between the inner friction plate 3041 and the circular ring plate 3043 is an acute angle. ;

[0057] In some optional embodiments, the first scheme of the clutch assembly 300 is a friction plate clutch assembly, a spline groove 3011 is opened on the inner side of the transmission wheel 301, and the transmission wheel 301 is fixed on the spindle assembly 500 through the spline groove 3011. In addition, the transmission wheel 301 and the spindle assembly 500 can also be fixed on the spindle assembly 500 by means of a key connection or the like; an annular protrusion 3031 is provided on the end surface of the clutch fixing plate 303 facing away from the main gear 900, and a plurality of inner friction plates 3041 are inserted into the annular protrusion 30 In the inner ring of 31, the friction protrusion 3044 abuts against the inner ring of the annular protrusion 3031; a plurality of external fixing grooves 3051 are provided on the side of the clutch base 305 close to the clutch torque plate 304, and the number of the external fixing grooves 3051 is the same as the number of the external fixing plates 3042. The external fixing plates 3042 of the clutch torque plate 304 are correspondingly plugged and fixed in the external fixing grooves 3051 of the clutch base 305; an arc-shaped protrusion plate is provided on the inner side of the arc surface between every two adjacent external fixing grooves 3051, and an internal fixing groove is formed between every two adjacent arc-shaped protrusion plates. 3052, the inner friction plate 3041 of the clutch torque plate 304 is correspondingly inserted into the inner fixing groove 3052. In this embodiment, a plurality of wedge-shaped blocks 904 are provided on the main gear 900, and the plurality of wedge-shaped blocks 904 jointly limit the clutch fixing plate 303 on one side of the main gear 900. When engaged, the clutch fixing plate 303 can rotate relative to the main gear 900. The operating principle of this scheme is that the main gear 900 rotates relative to the clutch fixing plate 303 under the drive of the motor 600, and the locking mechanism is locked at the main gear 900. Under the action, the clutch fixing plate 303 contacts and meshes with the transmission wheel 301, and the clutch torque plate 304 is interference fit and friction is generated between the two. The clutch torque plate 304 is fixed on the clutch base 305, thereby providing friction formed by torque to the clutch fixing plate 303, and the friction force causes the clutch fixing plate 303 and the main gear 900 to rotate relative to each other. When the locking is completed, the main gear 900 pushes the clutch fixing plate 303 to break through the friction provided by the clutch torque plate 304, so that the main gear 900 drives the clutch fixing plate 303 to rotate continuously.

[0058] In some optional embodiments, the first scheme of the clutch assembly 300 is a friction plate clutch assembly. In another possible form, a plurality of external fixing grooves 3051 are provided on the end surface of the clutch fixing plate 303 facing away from the main gear 900, and the number of the external fixing grooves 3051 is the same as the number of the external fixing plates 3042. The external fixing plates 3042 of the clutch torque plate 304 are correspondingly plugged and fixed in the external fixing grooves 3051 of the clutch fixing plate 303; an annular protrusion 3031 is provided on the side of the clutch base 305 close to the clutch torque plate 304, and a plurality of inner friction plates 3041 are plugged into the inner ring of the annular protrusion 3031, and the friction protrusion 3044 abuts against the inner ring of the annular protrusion 3031. On; the operating principle of this embodiment is that the main gear 900 rotates relative to the clutch fixing plate 303 under the drive of the motor 600, and the locking mechanism contacts and meshes with the transmission wheel 301 under the action of the main gear 900. The clutch fixing plate 303 and the clutch base 305 are interference fit and the two generate friction. The clutch torque plate 304 is fixed on the clutch fixing plate 303, thereby providing a friction force formed by torque to the clutch fixing plate 303, and the friction force causes the clutch fixing plate 303 and the main gear 900 to rotate relative to each other. When the locking is completed, the main gear 900 pushes the clutch fixing plate 303 to break through the friction force provided by the clutch torque plate 304, thereby realizing that the main gear 900 drives the clutch fixing plate 303 to rotate continuously.

[0059] In some optional embodiments, the second scheme of the clutch assembly 300 of the seat belt retractor is a spring-type clutch assembly, including a main gear 900, a locking mechanism, a transmission wheel 301, a clutch fixing plate 303, a one-way clutch spring 306 and a clutch base 305; a locking mechanism is provided between the main gear 900 and the clutch fixing plate 303, a one-way clutch spring 306 is provided between the clutch base 305 and the clutch fixing plate 303, one end of the one-way clutch spring 306 is connected to the clutch fixing plate 303, and the other end of the one-way clutch spring 306 is connected to the clutch base 305; when the main gear 900 rotates forward relative to the clutch fixing plate 303, the locking mechanism is pushed to be in contact with the transmission The gear 301 is in contact and meshing state; when the main gear 900 rotates in the opposite direction relative to the clutch fixing plate 303, the locking mechanism is pushed to a state of disengagement from the transmission gear 301; the inner ring of the one-way clutch spring 306 contacts the clutch base 305 to generate friction, providing friction for the clutch fixing plate 303 to rotate relative to the clutch base 305; when the clutch fixing plate 303 drives the one-way clutch spring 306 to rotate forward, the friction between the one-way clutch spring 306 and the clutch base 305 gradually increases; when the clutch fixing plate 303 drives the one-way clutch spring 306 to rotate in the opposite direction, the friction between the one-way clutch spring 306 and the clutch base 305 gradually decreases; the working principle is: the outer periphery of the main gear 900 An outer gear ring 903 is provided on the side, and the motor 600 is meshed with the outer gear ring 903 through the reduction mechanism assembly 200 to drive the main gear 900 to rotate. The clutch fixing plate 303 generates torque friction with the clutch base 305 under the action of the one-way clutch spring 306, and the main gear 900 rotates forward relative to the clutch fixing plate 303. During the rotation of the main gear 900, the locking mechanism is driven to mesh with the transmission wheel 301, and the main gear 900 continues to rotate. The clutch fixing plate 303 and the main gear 900 continue to rotate at the same time. The clutch fixing plate 303 is in continuous contact with the one-way clutch spring 306, and friction is generated between the two. The friction is not enough to prevent the rotation of the clutch fixing plate 303; when the main gear When the main gear 900 rotates in the reverse direction driven by the motor 600, the clutch fixing plate 303 drives the one-way clutch spring 306 to rotate in the reverse direction, the friction between the one-way clutch spring 306 and the clutch base 305 is reduced, and the locking mechanism is separated from the contact with the transmission wheel 301 under the action of the track groove on the main gear 900 or the reset spring 307; it should be noted that a spline groove 3011 is provided inside the transmission wheel 301, and the transmission wheel 301 is fixed to the spindle assembly 500 through the spline groove 3011; when the reset spring 307 is used to reset the locking block 302, a locking fixing plate 308 and a clutch support 309 are also provided on the clutch fixing plate 303;The beneficial effects of this embodiment are as follows: the friction force is generated by the inner circle of the one-way clutch spring 306 of this embodiment being reduced and contacting the clutch base 305 or the clutch fixing plate 303, which significantly improves the one-way locking performance of the main gear 900 to drive the locking mechanism to achieve the transmission wheel 301, and achieves extremely high motion synchronization between the main gear 900 and the clutch fixing plate 303. The spring-type clutch assembly has a simple structure and good stability, and significantly improves the clutch effect of the seat belt retractor. ;

[0060] In some optional embodiments, the second scheme of the clutch assembly 300 is a spring-type clutch assembly, the one-way clutch spring 306 is a spiral steel wire structure, one end of the spiral steel wire constituting the one-way clutch spring 306 is provided with a clutch spring extension end 3061, the clutch fixing plate 303 is provided with an annular protrusion on the end surface of the side facing away from the locking mechanism, the one-way clutch spring 306 is embedded in the annular protrusion, the inner circle of the annular protrusion is provided with a clutch spring clamping groove 3034, and the clutch spring extension end 3061 is inserted into the clutch spring clamping groove 3034; preferably, the one-way clutch spring 306 is formed by bending the elastic steel wire in one piece, the number of spiral turns of the one-way clutch spring 306 is greater than 2, and the outer circle diameter of the one-way clutch spring 306 is smaller than the inner circle diameter of the annular protrusion. The cam 3034 is provided with a plurality of spring clips 3034, and the plurality of spring clips 3034 are provided with a plurality of spring clips 3034. The plurality of spring clips 3034 are provided with a plurality of spring clips 3034. The plurality of spring clips 3034 are provided with a plurality of spring clips 3034. The plurality of spring clips 3034 are provided with a plurality of spring clips 3034. The plurality of spring clips 3034 are provided with a plurality of spring clips 3034. The plurality of spring clips 3034 are provided with a plurality of spring clips 3034. The card-free slot fails; an annular friction portion 3053 is provided on the side of the clutch base 305 close to the clutch fixing plate 303, and the inner ring of the one-way clutch spring 306 is sleeved on the outer peripheral side of the annular friction portion 3053; when the clutch fixing plate 303 drives the clutch spring protruding end 3061 to rotate forward, the friction force between the inner ring of the one-way clutch spring 306 and the outer peripheral side of the annular friction portion 3053 gradually increases; when the clutch fixing plate 303 drives the clutch spring protruding end 3061 to rotate reversely, the friction force between the inner ring of the one-way clutch spring 306 and the outer peripheral side of the annular friction portion 3053 gradually decreases, and the annular friction portion 3053 is sleeved on the outer peripheral side of one end of the core shaft assembly 500 of the seat belt retractor; by providing the annular friction portion 3053, a one-way clutch is realized. A reasonable friction force is generated between the spring 306 and the clutch base 305. In addition, the one-way clutch spring 306 is guided and limited. The inner ring of the one-way clutch spring 306 is interference-fitted with the outer peripheral side of the annular friction portion 3053. Specifically, the one-way clutch spring 306 can rotate relative to the annular friction portion 3053. The extension direction of the clutch spring extension end 3061 is the radial direction of the one-way clutch spring 306. By setting the clutch spring extension end 3061 to extend along the radial direction of the one-way clutch spring 306, the uniformity of the force on the one-way clutch spring 306 is improved, the one-way clutch spring 306 is prevented from being out of contact with the clutch spring slot 3034, and the stability of the one-way clutch spring 306 during use is improved.The spiral steel wire structure of the one-way clutch spring 306 is an equi-pitch spiral curve, and the pitch of the one-way clutch spring 306 is equal to the diameter of the steel wire constituting the one-way clutch spring 306. Through the arrangement of this embodiment, the one-way clutch spring 306 is not easy to deform and has a long service life. At the same time, the accuracy of the friction force change is significantly improved; the locking mechanism includes a plurality of locking blocks 302, and the plurality of locking blocks 302 are arranged in a circular array with equal intervals around the axis of the transmission wheel 301. One end of the locking block 302 is rotatably connected to the clutch fixing plate 303, and the other end of the locking block 302 is slidable Connected in the main gear 900; when the main gear 900 rotates forward, it pushes multiple locking blocks 302 to engage with the transmission wheel 301; when the main gear 900 rotates reversely, multiple locking blocks 302 are disengaged from the engagement with the transmission wheel 301; specifically, the main gear 900 pushes the locking blocks 302 to engage with the transmission wheel 301 through the track groove or guide surface; by setting multiple locking blocks 302, the stability of the main gear 900 driving the transmission wheel 301 to rotate simultaneously is significantly improved, and the vibration and noise are significantly reduced during the locking process. ;

[0061] In some optional embodiments, a friction plate clutch assembly or a spring clutch assembly of the seat belt retractor is selectively used, and the locking mechanisms of the two have the following two different schemes respectively.

[0062] In some optional embodiments, a locking mechanism of the first scheme includes a main gear 900, a transmission wheel 301, a locking block 302, a reset spring 307 and a clutch fixing plate 303; a guide chamber is provided on one end surface of the main gear 900, one end of the clutch fixing plate 303 is embedded in the guide chamber, and the inner ring of the main gear 900 is provided with at least one locking trigger protrusion 907, and each locking trigger protrusion 907 is correspondingly provided with a locking block 302; one end of the locking block 302 is rotatably connected to the clutch fixing plate 303, and the other end of the locking block 302 abuts against one end of the reset spring 307, and the other end of the reset spring 307 abuts against On the clutch fixing plate 303, the combination of the main gear 900 and the clutch fixing plate 303 is sleeved on the outer peripheral side of the transmission wheel 301; when the main gear 900 rotates forwardly relative to the clutch fixing plate 303, the locking trigger protrusion 907 pushes the locking block 302 to rotate to a state of contact and meshing with the transmission wheel 301; when the main gear 900 rotates reversely relative to the clutch fixing plate 303, the locking block 302 rotates to a state of disengagement from the transmission wheel 301 under the action of the reset spring 307; the locking trigger protrusion 907 is a cubic protrusion formed by the inner ring of the main gear 900 protruding toward the center of its circle, and the number of the locking blocks 302 is two, and the corresponding locking trigger protrusions There are also two springs 907, two locking blocks 302 are symmetrically arranged on the outer peripheral side of the transmission wheel 301, and an outer gear ring 903 is arranged on the outer peripheral side of the main gear 900. During use, the output shaft of the motor 600 is meshed with the outer gear ring 903 on the main gear 900 through the reduction mechanism assembly 200. Preferably, the reset spring 307 is a torsion spring, and the installation of the torsion spring occupies a small space. The outer gear ring 903 of the main gear 900 is an involute tooth shape. A spline groove 3011 is provided on the inner side of the transmission wheel 301, and the spline groove 3011 is used to realize the fixed connection between the transmission wheel 301 and the spindle assembly 500, and the spindle assembly 500 is used to realize the retraction of the seat belt; The working principle of this embodiment is that the main gear 900 rotates relative to the clutch fixing plate 303 under the drive of the motor 600, the locking block 302 is in contact and meshing with the transmission wheel 301 under the action of the locking trigger protrusion 907, and the clutch fixing plate 303 is interference fit with the clutch torque plate or the one-way clutch spring 306; when the clutch torque plate is used, the clutch torque plate is fixed on the clutch base 305; or, when the one-way clutch spring 306 is used, one end of the one-way clutch spring 306 is inserted into the clutch fixing plate 303, and the inner ring is sleeved on the clutch base 305. When the one-way clutch spring 306 rotates unidirectionally, the inner ring gradually shrinks and generates friction with the clutch base 305;Both of the above methods can provide friction force formed by torque to the clutch fixing plate 303, and the friction force causes the clutch fixing plate 303 and the main gear 900 to rotate relative to each other. When the locking transmission of the locking block 302 and the transmission wheel 301 is completed, the main gear 900 pushes the clutch fixing plate 303 to break through the friction force provided by the clutch torque plate or the one-way clutch spring 306, so that the main gear 900 drives the clutch fixing plate 303 to rotate continuously; the beneficial effects of this embodiment are: the locking block 302 set in this embodiment rotates under the push of the locking trigger protrusion 907, so that the locking block 302 gradually stabilizes and meshes with the transmission wheel 301 when the clutch assembly 300 rotates relative to the clutch fixing plate 303 during use. During use, the vibration and noise generated by the locking mechanism are significantly reduced, and the stability of the locking mechanism during operation is significantly improved. The reset spring 307 is provided to realize the function of one-way rotation locking and reverse reset of the main gear 900. ;

[0063] In some optional embodiments, a locking mechanism of the first scheme, the locking block 302 includes a rotating portion 3022 and a locking portion 3024, the rotating portion 3022 is connected to the locking portion 3024, and the locking portion 3024 is provided with at least one transmission tooth meshing with the transmission wheel 301 on the side close to the transmission wheel 301, and a torsion spring slot 3026 is provided on the locking portion 3024, and the end of the return spring 307 that abuts against the locking block 302 is inserted into the torsion spring slot 3026. In this embodiment, preferably, the transmission teeth on the locking block 302 are asymmetric trapezoidal teeth, and the asymmetric trapezoidal teeth are inclined toward the side of the positive rotation of the transmission wheel 301. This method has greater traction; in addition, the transmission teeth can also be special-shaped teeth, serrated teeth, or involute teeth. The locking portion 3024 is also provided with a locking pressure-bearing protrusion 3025, and the locking pressure-bearing protrusion 3025 is located on the side of the torsion spring slot 3026 away from the transmission tooth; when the main gear 900 pushes the locking block 302 to rotate, the locking trigger protrusion 907 abuts against the locking pressure-bearing protrusion 3025, and the force-bearing surface of the locking pressure-bearing protrusion 3025 extends along the radial direction of the transmission wheel 301. At this time, the surface of the locking trigger protrusion 907 in contact with the locking pressure-bearing protrusion 3025 is along the radial direction of the main gear 900. The locking plate 308 is also provided with at least one locking hole 3081, and the clutch fixing plate 303 is provided with at least one first limiting pin 3035 on one side end face of the clutch fixing plate 303 close to the locking block 302, and the locking hole 3081 is correspondingly plugged into the first limiting pin 3035, and the locking fixing plate 308 is in an arc shape, and an arc-shaped rotation matching groove 3082 is provided at one end of the arc-shaped locking fixing plate 308, and the rotating portion 3022 of the locking block 302 is rotatably connected in the rotation matching groove 3082; preferably, the locking fixing hole 3081 is The first limiting pin 3035 is a cylindrical pin. There are two locking fixing holes 3081 on each locking fixing plate 308, which are correspondingly plugged into the two first limiting pins 3035. By setting the locking fixing plate 308, a better supporting effect is played on the locking block 302, avoiding damage to the clutch fixing plate 303 during the movement of the locking block 302, and reducing the difficulty of parts maintenance; a force-bearing surface 3083 is convexly provided on the outer arc surface of the locking fixing plate 308, and a force-bearing guide surface 908 is provided on the inner ring of the main gear 900, and the force-bearing guide surface 908 is located next to the locking trigger protrusion 907; when the main gear 900 pushes the locking block 302 to rotate, the force-bearing guide surface 908 abuts against the force-bearing surface 3083;By providing the force guiding surface 908 and the force bearing surface 3083, the synchronization of the joint rotation of the main gear 900 and the clutch fixing plate 303 is improved, and the reduction in the service life of the locking block 302 caused by excessive force on the locking block 302 is reduced; at least one second limit pin 3037 is also provided on the end surface of the clutch fixing plate 303 close to the locking block 302, and a torsion spring fixing groove 3036 is arranged around the outer side of the second limit pin 3037; the middle part of the reset spring 307 is sleeved on the second limit pin 3037, and the reset spring 307 has a first leg 3071 and a second leg 3072 connected to the middle part of the reset spring 307, the first leg 3071 is inserted into the torsion spring slot 3026 of the locking block 302, and the second leg 3072 abuts against the clutch fixing plate 303. In the torsion spring fixing groove 3036 of the fixing plate 303, preferably, the second limiting pin 3037 is a cylindrical pin. By setting the second limiting pin 3037, the reset spring 307 is effectively limited. A torsion spring supporting protrusion 3038 is set in the torsion spring fixing groove 3036. The torsion spring supporting protrusion 3038 is located on the side of the second limiting pin 3037 away from the first limiting pin 3035. The middle part of the first leg 3071 abuts against the torsion spring supporting protrusion 3038. By setting the torsion spring supporting protrusion 3038, the supporting effect on the first leg 3071 is achieved, the uniformity of the force of the torsion spring is improved, and a fulcrum for the first leg 3071 is formed at the torsion spring supporting protrusion 3038, so that the force generated by the reset of the locking block 302 is more uniform and stable.

[0064] In some optional embodiments, a locking mechanism of the first scheme also includes a clutch support 309, the clutch support 309 is a circular sheet structure, and a first limiting hole 3091 and a second limiting hole 3092 are opened on the clutch support 309, the first limiting hole 3091 is corresponding to the first limiting pin 3035, and the second limiting hole 3092 is corresponding to the second limiting pin 3037; the first limiting pin 3035 is inserted in the first limiting hole 3091, and the second limiting pin 3037 is inserted in the second limiting hole 3092; the locking block 302 and the locking fixing block are both located at the clutch support 309. Preferably, the first limiting hole 3091 and the second limiting hole 3092 are both circular holes between the clutch support 309 and the clutch fixing plate 303. By setting the clutch support 309, a limiting effect is played on the locking block 302, the return spring 307 and the locking fixing plate 308, thereby avoiding axial movement of the three in the axial direction of the transmission wheel 301. When there are multiple locking blocks 302, the multiple locking blocks 302 are arranged in a circular array with equal intervals around the axis of the transmission wheel 301. By setting multiple locking blocks 302, the locking mechanism is more stable during operation and has less impact during use.

[0065] In some optional embodiments, a locking mechanism of the second scheme includes a main gear 900, a transmission wheel 301, a locking block 302 and a clutch fixing plate 303; a guide chamber 905 is provided on one side end surface of the main gear 900, one end of the clutch fixing plate 303 is embedded in the guide chamber 905, at least one locking block 302 is provided between the main gear 900 and the clutch fixing plate 303, and the main gear 900 is located on the bottom surface of the guide chamber 905 and has at least one track groove 901, and the number of the track grooves 901 and the locking block 302 are the same and are arranged one by one; one end of the locking block 302 is rotatably connected to the clutch fixing plate 303, and the other end of the locking block 302 is slidably connected in the track groove 901, and the main gear 90 0 and the clutch fixing plate 303 are sleeved on the outer peripheral side of the transmission wheel 301; when the main gear 900 rotates forwardly relative to the clutch fixing plate 303, the locking block 302 slides in the track groove 901 until it is in contact and meshing state with the transmission wheel 301; when the main gear 900 rotates reversely relative to the clutch fixing plate 303, the locking block 302 slides in the track groove 901 until it is out of contact with the transmission wheel 301; in a specific embodiment, the number of locking blocks 302 is two, and the number of corresponding track grooves 901 is also two, the two locking blocks 302 are symmetrically arranged on the outer peripheral side of the transmission wheel 301, and the outer peripheral side of the main gear 900 is provided with an outer gear ring 903. During use, the output shaft of the motor 600 passes through the reducer The component 200 is meshed with the outer gear ring 903 on the main gear 900. Preferably, the outer gear ring 903 of the main gear 900 is an involute tooth shape, and a spline groove 3011 is provided on the inner side of the transmission wheel 301. The spline groove 3011 is used to realize the fixed connection between the transmission wheel 301 and the spindle component 500, and the spindle component 500 is used to realize the retraction of the seat belt. The use principle of this embodiment is that the main gear 900 is driven by the motor 600 to rotate relative to the clutch fixing plate 303, and the locking block 302 is in contact and meshed with the transmission wheel 301 under the action of the track groove 901. The clutch fixing plate 303 and the clutch torque plate 304 are interference fit, and the clutch torque plate 304 is fixed on the clutch base 305, thereby providing the clutch fixing plate 303 with a torque plate 304. The friction force formed by the torque causes the clutch fixing plate 303 and the main gear 900 to rotate relative to each other. When the locking is completed, the main gear 900 pushes the clutch fixing plate 303 to break through the friction force provided by the clutch torque plate 304, so that the main gear 900 drives the clutch fixing plate 303 to rotate continuously; the locking block 302 is set to slide in the track groove 901, so that the clutch assembly 300 is gradually stabilized and meshed with the transmission wheel 301 as the main gear 900 rotates relative to the clutch fixing plate 303 during use. During use, the vibration noise generated by the locking mechanism is significantly reduced, and the stability of the locking mechanism during operation is significantly improved, thereby realizing the one-way rotation locking function of the main gear 900.

[0066] In some optional embodiments, a locking mechanism of the second scheme, when there are multiple locking blocks 302, the multiple locking blocks 302 are arranged in a circular array with equal intervals around the axis of the transmission wheel 301, and there are two locking blocks 302. In addition, the number of locking blocks 302 can also be one, three or even more. The more the number of locking blocks 302, the higher the stability of the transmission; the locking block 302 includes a rotating part 3022, a connecting part 3023, a locking part 3024 and a sliding protrusion 3021; ​​the rotating part 3022 and the locking part 3024 are connected by the connecting part 3023, and the sliding protrusion 3021 is provided on the side of the connecting part 3023, the sliding protrusion 3021 is slidably connected to the track groove 901, and the rotating part 3022 is fixed to the clutch The plate 303 is rotatably connected, and the locking portion 3024 is provided with at least one transmission tooth meshing with the transmission wheel 301. Preferably, the sliding protrusion 3021 is a cylindrical pin structure; a shock-absorbing spring piece 902 is also provided on the main gear 900, and one end of the shock-absorbing spring piece 902 is fixed to one end of the track groove 901, and the other end of the shock-absorbing spring piece 902 extends to the other end of the track groove 901 and is inclined toward the inside of the track groove 901. The shock-absorbing spring piece 902 abuts against the sliding protrusion 3021. Preferably, the shock-absorbing spring piece 902 and the main gear 900 are an integrally formed structure. By providing the shock-absorbing spring piece 902, the noise generated during the working process of the locking block 302 is significantly reduced under the elastic limiting action of the shock-absorbing spring piece 902; the extension line of the track groove 901 is a circle The center of curvature of the arc curve is located at an eccentric position of the center of the main gear 900. The shock-absorbing spring piece 902 is in the shape of an arc. In addition, the track groove 901 can also be in the shape of an involute. By setting the track groove 901 in the shape of an arc curve, the stability of the sliding protrusion 3021 of the locking block 302 moving in the track groove 901 is enhanced, and the impact generated during the movement is reduced; the tooth shape on the outer peripheral side of the transmission wheel 301 is an asymmetric trapezoidal tooth, and the asymmetric trapezoidal tooth shape on the outer peripheral side of the transmission wheel 301 is inclined toward the side of the locking part 3024 away from the rotating part 3022, and the transmission teeth of the locking part 3024 are asymmetric trapezoidal teeth adapted to the tooth shape on the outer peripheral side of the transmission wheel 301; through the structural form of the asymmetric trapezoidal teeth, the locking block 302 and the transmission wheel 301 are in the shape of an arc curve. 01 has a very high meshing force. In addition, the tooth shape on the outer side of the transmission wheel 301 can also be an involute cylindrical tooth shape, a triangular tooth shape, a sawtooth tooth shape, a rectangular tooth shape or other special-shaped teeth; a pressure-bearing surface 906 is arranged in the guide chamber 905 of the main gear 900, and the pressure-bearing surface 906 abuts against the outer side surface of the locking portion 3024 away from the connecting portion 3023, and the pressure-bearing surface 906 extends along the radial direction of the transmission wheel 301. When the pressure-bearing surface 906 extends along the radial direction of the transmission wheel 301, when the locking block 302 is in a locked state, the force direction of the locking block 302 is along the tangent direction of the outer edge of the transmission wheel 301, and the force is most ideal at this time; in addition, the extension direction of the pressure-bearing surface 906 can also be at a certain angle to the radial direction of the transmission wheel 301;The main gear 900 is also provided with a plurality of wedge-shaped blocks 904 on the outer edge of one side of the guide chamber 905. The plurality of wedge-shaped blocks 904 are clamped on the end face of the clutch fixing plate 303 facing away from the main gear 900. By providing the wedge-shaped blocks 904, the offset between the clutch fixing plate 303 and the main gear 900 is effectively avoided, and the stability of the contact operation between the two is significantly enhanced; the clutch fixing plate 303 is provided with at least one limiting protrusion 3032 on the end face of the inner side of the guide chamber 905, and each limiting protrusion 3032 is provided with a limiting groove 3033 with an open end, and the rotating portion 3022 of the locking block 302 and the closed end of the limiting groove 3033 are engaged with each other. Rotationally connected, the locking portion 3024 of the locking block 302 extends out of the open end of the limiting groove 3033, and the limiting groove 3033 is a V-shaped groove whose width at the open end is greater than that at the closed end. By setting the limiting groove 3033, the deflection angle of the locking block 302 is avoided to be too large, and the impact phenomenon generated during the use of the locking block 302 is reduced; an annular protrusion 3031 is provided on the end surface of the clutch fixing plate 303 away from the main gear 900, and the annular protrusion 3031 is a circular cylindrical structure. The annular protrusion 3031 contacts the clutch torque plate 304, and there is a certain friction between the two. The clutch torque plate 304 is fixed on the clutch base 305. ;

[0067] A friction plate clutch assembly of the first scheme of the clutch assembly 300 of the seat belt retractor in the above embodiment may be provided with a locking mechanism of the first scheme or a locking mechanism of the second scheme. Similarly, a spring clutch assembly of the second scheme of the clutch assembly 300 in the above embodiment may be provided with a locking mechanism of the first scheme or a locking mechanism of the second scheme.

[0068] In some optional embodiments, the seat belt retractor also has a seat belt trigger structure, including a magnet 15 and a Hall sensor 14, the magnet 15 is arranged on the side of the coil spring cover 12 facing the coil spring, the Hall sensor 14 is arranged on the base 2013, and the base 2013 is provided with a first groove 20131. Under the action of the coil spring 101, the magnet 15 moves along the first groove 20131, and when the magnet 15 is opposite to the Hall sensor 14, the magnet 15 triggers the Hall sensor 14; when the magnet 15 moves along the first groove 20131, when the limit position of the coil spring 101 is reached, the magnet 15 is opposite to the Hall sensor 14, thereby triggering the Hall sensor, causing the motor to stop, preventing the coil spring 101 from being damaged, and avoiding To avoid the phenomenon of exceeding the limit position of the coil spring 101 and damaging the coil spring 101; the coil spring cover plate 12 is also provided with a spring mounting portion 121, and the spring mounting portion 121 extends tangentially along the circumference of the coil spring cover plate 12; wherein the number of the spring mounting portion 121 is one, one end of the spring 102 is fixed on the spring mounting portion 121, wherein a part of the spring 102 is sleeved on the outer surface of the spring mounting portion 121; the spring mounting portion 121 is cylindrical or truncated cone-shaped, and when the spring mounting portion 121 is truncated cone-shaped, the end close to the coil spring cover plate 12 is the large head end; wherein the spring mounting portion 121 is cylindrical or truncated cone-shaped, so that the spring 102 will not be hindered by the side of the spring mounting portion 121 during the compression process, so that the spring 1 02's entire compression and expansion process is smooth and smooth; a second groove 20132 is provided on the end surface opposite to the coil spring cover 12, and when the coil spring cover 12 rotates, the spring mounting portion 121 can move in the second groove 20132 to compress or release the spring 102; wherein, the space between the second groove 20132 and the spring mounting portion 121 is the activity space of the spring 102; the trigger structure for the seat belt also includes a positioning cover 13, and the positioning cover 13 is arranged between the coil spring cover 12 and the base 2013; wherein, the arrangement of the positioning cover 13 is mainly to facilitate the installation of the coil spring cover 12 and the coil spring 101; the control unit 400 is connected to the Hall sensor 14, and is used to turn off the motor according to the signal sent by the Hall sensor 14 600; the control unit 400 is used to control the start and stop of the motor 600 and the size of the rotation speed; the trigger structure for the seat belt also includes a magnet mounting portion 122, one end of the magnet mounting portion 122 is fixed to the edge of the coil spring cover plate 12, and extends along the central axis of the coil spring cover plate 12 in the direction close to the Hall sensor 14; by setting the magnet mounting portion 122, the distance between the magnet 15 and the Hall sensor 14 can be closer, so that the trigger structure can be more sensitive, wherein the magnet mounting portion 122 is cylindrical, truncated cone or rectangular, and in actual use, the magnet mounting portion 122 can also adopt other shapes, as long as the distance between the magnet 15 and the Hall sensor 14 can be closer;The magnet 15 is embeddedly installed at the end of the magnet installation part 122; by adopting this installation method, the magnet 15 can be prevented from falling off, and the failure of the trigger structure caused by the magnet 15 falling off can be avoided; when the spring 102 is in the limit state of compression, the magnet 15 is opposite to the Hall sensor 14, the Hall sensor 14 is triggered, and the control unit 400 stops the motor 600 according to the signal of the Hall sensor 14 to avoid exceeding the limit position of the coil spring 101. Then, the coil spring cover plate 12 will rotate in the opposite direction under the action of the spring 102, so that the coil spring 101 is opened to a certain extent, so that the magnet 15 is not opposite to the Hall sensor 14, that is, the magnet 15 is in a non-triggering position; the first groove 20131 and the second groove 20132 are respectively arranged on both sides of the circular ring in the base 2013, and their shapes are both arc grooves; it also includes an outer cover 11, which is used to close the speed reduction mechanism assembly 200 and the coil spring cover plate 12. ;

[0069] In some optional embodiments, the seat belt retractor further has a seat belt shearing assembly, including a pin 501 and a pin hole 104, wherein the pin 501 is arranged at one end of the spindle assembly 500 close to the shaft head of the coil spring assembly 100, and the pin hole 104 is arranged on the shaft head of the coil spring assembly 100; or, the pin 501 is arranged at one end of the shaft head of the coil spring assembly 100, and the pin hole 104 is arranged at one end of the spindle assembly 500 close to the shaft head of the coil spring assembly 100; the pin hole 104 is opposite to the pin 501; when the shaft head of the coil spring assembly 100 is connected to the spindle assembly 500, the pin 501 is inserted into the pin hole 104; by setting the pin 501 and the pin hole 104, when the motor structure is used to drive the seat belt retractor and both ends of the spindle assembly 500 are fixed and locked at the same time, the spindle assembly 500 can be sheared when the lock reaches a certain force value, so that the spindle assembly can continue to perform force limiting control to relieve the pressure of the seat belt on the chest of the occupant; the number of pins 501 is one or more, and is set on the end face of the spindle assembly 500; the number of pin holes 104 is the same as the number of pins 501, and the position of the pin hole 104 is opposite to the corresponding pin 501. Among them, the number of pins 501 is related to the force value required for shearing. When the force value required for shearing is small, the number of pins 501 can be selected to be small. For example, when the setting spindle assembly 500 is locked to 75 Newtons, a pin 501 can be selected; when the setting spindle assembly 500 is locked to 150 Newtons, the pin 501 is sheared off, and two pins 501 can be selected, wherein the centers of the two pins 501 and the end faces of the spindle assembly 500 are on the same straight line; a protrusion 103 is formed on the axial inner surface of the coil spring assembly 100, and a pin hole 104 is arranged on the protrusion 103 of the coil spring assembly 100, the cross-section of the protrusion 103 is arc-shaped, and the pin hole 104 is arranged along the axial direction of the protrusion 103. The pin 501 is cylindrical, the pin hole 104 is circular, and the diameter of the pin hole 104 matches the diameter of the pin 501. Alternatively, the pin 501 is truncated cone, and its large end contacts the mandrel assembly 500, and the shape and size of the pin hole 104 match the shape and size of the pin 501. Alternatively, the pin 501 is rectangular, the cross section of the pin hole 104 is rectangular, and the size of the pin hole 104 matches the size of the pin 501. Alternatively, the pin 501 is pyramidal, and the size of the pin hole 104 matches the shape and size of the pin. When making a selection, the pin 501 can also be of other shapes, which only needs to match the shape of the pin hole 104, wherein the size of the pin hole 104 is slightly larger than the size of the pin 501, so that the pin 501 can normally enter the pin hole 104. When the number of pins 501 is one, its center position is set at a non-center position of the end face of the mandrel assembly 500.When there are multiple pins 501, the multiple pins 501 are evenly distributed on the end face of the spindle assembly 500 along the center of the end face of the spindle assembly 500, wherein the number of pins 501 is two, and other numbers of pins can be selected for setting as needed, such as 3 or 4, etc., wherein the distance between the center position of the pin 501 and the center position of the end face of the spindle assembly 500 is not specifically limited. The material of the pin 501 is metal or plastic. Among them, when selecting the material of the pin 501, it can be the same as the material of the spindle assembly 500, obtained by an integrated molding process, or it can be made of different materials and fixed to the end face of the spindle assembly 500 by welding or bonding.

[0070] In some optional embodiments, the seat belt retractor also includes a mechanical end assembly 800, which is arranged on the side of the core shaft assembly 500 close to the pretensioner assembly 700; the mechanical end assembly 800 includes a sensor assembly and a locking structure, wherein the sensor assembly includes a vehicle sensing sensor, a belt sensing sensor and a tilt angle sensor; the sensor assembly can sense an emergency situation occurring in the vehicle and trigger a gas generator in time, and the locking mechanism can quickly lock the retractor, which can buffer the pressure of the seat belt.

Claims

1. A spring clutch assembly, characterized in that: The invention comprises a main gear, a locking mechanism, a transmission wheel, a clutch fixing plate, a one-way clutch spring and a clutch base; the locking mechanism is arranged between the main gear and the clutch fixing plate, the one-way clutch spring is arranged between the clutch base and the clutch fixing plate, one end of the one-way clutch spring is connected to the clutch fixing plate, and the other end of the one-way clutch spring is connected to the clutch base; when the main gear rotates forwardly relative to the clutch fixing plate, the locking mechanism is pushed to a state of contact and meshing with the transmission wheel; when the main gear rotates reversely relative to the clutch fixing plate, the locking mechanism is pushed to a state of disengagement from the transmission wheel; the inner ring of the one-way clutch spring contacts the clutch base to generate friction; when the clutch fixing plate drives the one-way clutch spring to rotate forwardly, the friction between the one-way clutch spring and the clutch base gradually increases; when the clutch fixing plate drives the one-way clutch spring to rotate reversely, the friction between the one-way clutch spring and the clutch base gradually decreases; The one-way clutch spring is a spiral steel wire structure, one end of the spiral steel wire constituting the one-way clutch spring is provided with a clutch spring extension end, an annular protrusion is provided on the end surface of the clutch fixing plate on the side away from the locking mechanism, the one-way clutch spring is embedded in the annular protrusion, the inner ring of the annular protrusion is provided with a clutch spring clamping groove, and the clutch spring extension end is inserted into the clutch spring clamping groove; The locking mechanism includes a plurality of locking blocks, which are arranged in a circular array with equal intervals around the axis of the transmission wheel. One end of the locking block is rotatably connected to the clutch fixing plate, and the other end of the locking block is slidably connected to the main gear. When the main gear rotates forward, the plurality of locking blocks are pushed to engage with the transmission wheel; when the main gear rotates reversely, the plurality of locking blocks are disengaged from the engagement with the transmission wheel.

2. A spring clutch assembly according to claim 1, characterized in that: The width of the clutch spring slot is greater than the diameter of the extended end of the clutch spring.

3. A spring clutch assembly according to claim 2, characterized in that: The clutch spring retaining grooves are multiple in number, and the multiple clutch spring retaining grooves are arranged in a circular array with equal intervals around the axis of the clutch fixing plate.

4. A spring clutch assembly according to claim 3, characterized in that: An annular friction portion is provided on the side of the clutch base close to the clutch fixing plate, and the inner ring of the one-way clutch spring is sleeved on the outer peripheral side of the annular friction portion; when the clutch fixing plate drives the extended end of the clutch spring to rotate in the forward direction, the friction force between the inner ring of the one-way clutch spring and the outer peripheral side of the annular friction portion gradually increases; when the clutch fixing plate drives the extended end of the clutch spring to rotate in the reverse direction, the friction force between the inner ring of the one-way clutch spring and the outer peripheral side of the annular friction portion gradually decreases, and the annular friction portion is sleeved on the outer peripheral side of one end of the core shaft assembly of the seat belt retractor.

5. A spring clutch assembly according to claim 4, characterized in that: The inner ring of the one-way clutch spring is interference-fitted with the outer peripheral side of the annular friction portion.

6. A spring clutch assembly according to claim 1, characterized in that: The extending direction of the extended end of the clutch spring is the radial direction of the one-way clutch spring.

7. A spring clutch assembly according to claim 1, characterized in that: The spiral steel wire structure of the one-way clutch spring is an equal-pitch spiral curve, and the pitch of the one-way clutch spring is equal to the diameter of the steel wire constituting the one-way clutch spring.

8. A seat belt retractor, characterized in that: Comprising a spring clutch assembly as claimed in any one of claims 1 to 7.

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