CN212073955U - Locking mechanism and safety belt retractor - Google Patents

Abstract

The utility model discloses a locking mechanism and a safety belt retractor, wherein at least one locking block is arranged between a main gear and a clutch fixing piece, at least one track groove is arranged on the bottom surface of a guide cavity of the main gear, and the track grooves are the same as the locking blocks in number and are arranged in a one-to-one correspondence manner; one end of the locking block is rotatably connected with the clutch fixing piece, the other end of the locking block is connected in the track groove in a sliding manner, and a combined body of the main gear and the clutch fixing piece is sleeved on the outer peripheral side of the transmission wheel; when the main gear rotates forward relative to the clutch fixing piece, the locking block slides in the track groove to be in contact and meshed with the transmission wheel; when the main gear rotates reversely relative to the clutch fixing piece, the locking block slides in the track groove to be in a state of being separated from the driving wheel. Aim at solves the big problem of vibration noise among the prior art clutch assembly use of safety belt coiler. The effect is as follows: the vibration noise generated by the locking mechanism is obviously reduced, and the stability of the locking mechanism in the operation process is obviously improved.

Description

Locking mechanism and safety belt retractor

Technical Field

The utility model relates to a vehicle safety belt technical field, concretely relates to locking mechanism still relates to a safety belt coiler.

Background

The existing safety belt retractor can provide protection for a driver before collision, and the active safety belt retractor driven by the motor can drive the safety belt retractor to retract a certain amount of safety belt through the motor before the vehicle possibly collides, so that the safety belt retractor can protect the driver.

The motor of the safety belt retractor has smaller output torque, the existing clutch for the safety belt retractor mainly takes a tooth type clutch as a main part, and the clutch has the problems of large clutch delay, no synchronism of inner and outer teeth and large impact vibration noise in the use process; the clutch locking mechanism with small vibration noise, simple structure and good stability is lacked.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a locking mechanism to solve the problem that the clutch assembly of safety belt coiler uses the in-process noise vibration big among the prior art.

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

according to a first aspect of the present invention, a locking mechanism comprises a main gear, a transmission wheel, a locking block and a clutch fixing piece; the end face of one side of the main gear is provided with a guide cavity, one end of the clutch fixing piece is embedded in the guide cavity, at least one locking block is arranged between the main gear and the clutch fixing piece, the main gear is positioned on the bottom surface of the guide cavity and provided with at least one track groove, and the track grooves and the locking blocks are the same in number and are arranged in a one-to-one correspondence manner; one end of the locking block is rotatably connected with the clutch fixing piece, the other end of the locking block is connected in the track groove in a sliding manner, and a combined body of the main gear and the clutch fixing piece is sleeved on the outer peripheral side of the transmission wheel; when the main gear rotates forward relative to the clutch fixing piece, the locking block slides in the track groove to be in contact and meshed with the transmission wheel; when the main gear rotates reversely relative to the clutch fixing piece, the locking block slides in the track groove to be in a state of being separated from the driving wheel.

Further, when the number of the locking blocks is multiple, the locking blocks are arranged in an annular array at equal intervals around the axis of the transmission wheel.

Further, the locking block comprises a rotating part, a connecting part, a locking part and a sliding protrusion; the rotating portion is connected with the locking portion through the connecting portion, a sliding protrusion is arranged on the side face of the connecting portion and is in sliding connection with the track groove, the rotating portion is in rotating connection with the clutch fixing piece, and at least one transmission tooth meshed with the transmission wheel is arranged on the locking portion.

Furthermore, still be provided with the shock attenuation shell fragment on the master gear, the one end of shock attenuation shell fragment is fixed in the one end of orbit groove, and the other end of shock attenuation shell fragment extends and inclines towards the orbit inslot portion to the other end of orbit groove, and the shock attenuation shell fragment is with the protruding butt that slides.

Furthermore, the extension line of the track groove is an arc curve, the curvature center of the arc curve is positioned at the eccentric position of the circle center of the main gear, and the damping elastic sheet is arc-shaped.

Furthermore, the tooth form of the outer periphery of the transmission wheel is matched with the tooth form of the transmission teeth of the locking part.

Furthermore, the tooth profile on the outer periphery of the transmission wheel is asymmetric trapezoidal teeth, the asymmetric trapezoidal tooth profile on the outer periphery of the transmission wheel inclines towards one side, away from the rotating part, of the locking part, and the transmission teeth of the locking part are asymmetric trapezoidal teeth matched with the tooth profile on the outer periphery of the transmission wheel.

Furthermore, a pressure bearing face is arranged in the guide cavity of the main gear, the pressure bearing face is abutted against the outer side face of the locking part, which deviates from the connecting part, and the pressure bearing face extends along the radial direction of the driving wheel.

Furthermore, the outer edge of one side of the main gear, which is positioned in the guide cavity, is also provided with a plurality of wedge-shaped fixture blocks, and the wedge-shaped fixture blocks are clamped on the end face, which is away from the main gear, of one side of the clutch fixing piece.

Further, the separation and reunion stationary blade is provided with at least one spacing arch on being located the inboard terminal surface of direction cavity, has seted up the open spacing groove of one end in every spacing arch, and the rotation portion of lock piece rotates with the blind end of spacing groove to be connected, and the open end of spacing groove is stretched out to the lock portion of lock piece, and the spacing groove is greater than the V-arrangement groove of its blind end width for the width of its open end.

According to the utility model discloses a second aspect, a safety belt coiler, include the utility model discloses the locking mechanism of any one of the first aspect.

The utility model has the advantages of as follows: through the utility model discloses the locking piece that sets up slides in the orbit inslot, realized that clutch subassembly in the use along with master gear relative separation and reunion stationary blade when rotating locking piece progressively stable and with the drive wheel meshing, in the use, the vibration noise that locking mechanism produced is showing and is reducing, and the stationarity of locking mechanism operation in-process is showing and is improving, has realized master gear unidirectional rotation locking function.

Drawings

Fig. 1 is a clutch torque plate structure diagram of a friction plate clutch assembly according to some embodiments of the present invention.

Fig. 2 is an exploded view of a friction plate clutch pack according to some embodiments of the present invention.

Fig. 3 is a front view of a friction plate clutch pack according to some embodiments of the present invention.

Fig. 4 is a cross-sectional view of a friction plate clutch pack according to some embodiments of the present invention.

Fig. 5 is an exploded view of a friction plate clutch pack according to further embodiments of the present invention.

Fig. 6 is an exploded view of a spring clutch assembly according to some embodiments of the present invention.

Fig. 7 is a plan view of some embodiments of the present invention showing a spring clutch assembly.

Fig. 8 is a clutch fixing plate structure diagram of a spring type clutch assembly according to some embodiments of the present invention.

Fig. 9 is a structure view of a one-way clutch spring of a spring clutch assembly according to some embodiments of the present invention.

Fig. 10 is a front view of a first embodiment of a locking mechanism according to the present invention.

Fig. 11 is a block diagram of a first embodiment of a locking mechanism according to the present invention.

Fig. 12 is a diagram of a return spring structure of a locking mechanism according to a first aspect of some embodiments of the present invention.

Fig. 13 is a structure view of a clutch fixing plate of a locking mechanism according to a first embodiment of the present invention.

Fig. 14 is a structure view of a locking fixing plate of a locking mechanism according to a first embodiment of the present invention.

Fig. 15 is an exploded view of a locking mechanism according to a second aspect of some embodiments of the present invention.

Fig. 16 is a front partial cross-sectional view of a locking mechanism according to a second aspect of some embodiments of the present invention.

Fig. 17 is a structural view of a main gear of a locking mechanism according to a second aspect of some embodiments of the present invention.

Fig. 18 is a diagram of a locking mechanism locking block according to a second aspect of the present invention.

Fig. 19 is a schematic view of an overall structure of a motor-driven seatbelt retractor according to some embodiments of the present invention;

fig. 20 is a schematic view of a transmission structure of a motor driving structure for a safety belt according to some embodiments of the present invention;

fig. 21 is a schematic diagram of a transmission structure of a motor driving structure for a safety belt according to some embodiments of the present invention (with a planetary carrier gear removed);

fig. 22 is a schematic diagram of a transmission structure of a motor driving structure for a seat belt according to some embodiments of the present invention (with a base);

fig. 23 is a schematic view of a main gear according to some embodiments of the present invention;

fig. 24 is a schematic view of a step gear according to some embodiments of the present invention;

fig. 25 is a schematic diagram of a transmission structure of a high torque motor driving structure for a safety belt according to some embodiments of the present invention;

fig. 26 is a schematic view of a high torque motor drive for a seat belt according to some embodiments of the present invention;

fig. 27 is a schematic structural view of a high torque motor-driven structure for a seat belt according to some embodiments of the present invention (with the secondary transmission gear removed);

fig. 28 is a schematic view of an eccentric structural assembly according to some embodiments of the present invention;

fig. 29 is a schematic illustration of an exploded view of a seat belt retractor according to some embodiments of the present invention;

fig. 30 is a schematic view of a seat belt retractor according to some embodiments of the present invention (with the outer cover removed);

fig. 31 is a schematic view of a coil spring cover according to some embodiments of the present invention;

fig. 32 is a schematic structural view of a triggering structure for a seat belt according to some embodiments of the present invention in a triggered state;

fig. 33 is a schematic view of a triggering mechanism for a seat belt according to some embodiments of the present invention in a non-triggered state;

fig. 34 is a schematic view of a seat belt shearing assembly according to some embodiments of the present invention;

in the figure: 100. 101, coil spring, 102, spring, 103, protrusion, 104, pin hole, 200, reduction mechanism assembly, 201, planet carrier gear assembly, 2011, common planet gear, 2012, planet gear internal gear, 2013, base, 20131, first groove, 20132, second groove, 2014, planet carrier gear, 2015, spline, 2016, cylinder, 202, step gear, 2021, driving external gear, 2022, primary driven gear, 203, swing gear assembly, 2031, swing gear, 2032, transmission, 204, eccentric structure assembly, 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, lock block, 3021, sliding projection, 3022, rotating portion, 3023, connecting portion, 3024, lock-up portion, 3025, lock-up projection, 3026, pressure-bearing portion, 3024, A torsion spring clamping groove, 303, a clutch fixing piece, 3031, an annular bulge, 3032, a limiting bulge, 3033, a limiting groove, 3034, a clutch spring clamping groove, 3035, a first limiting pin, 3036, a torsion spring fixing groove, 3037, a second limiting pin, 3038, a torsion spring supporting bulge, 304, a clutch torque piece, 3041, an inner friction plate, 3042, an outer fixing piece, 3043, a ring piece, 3044, a friction bulge, 305, a clutch base, 3051, an outer fixing groove, 3052, an inner fixing groove, 3053, an annular friction part, 306, a one-way clutch spring, 3061, a clutch spring extension end, 307, a reset spring, 3071, a first supporting leg, 3072, a second supporting leg, 308, a locking fixing piece, 3081, a locking fixing hole, 3082, a rotating matching groove, 3083, a force applying bearing surface, 309, a clutch support, 3091, a first limiting hole, 3092, a second limiting hole, 400, a control unit, 500, a clutch assembly, a pin 501, 600 and a motor, 601. the locking device comprises a driving gear 700, a pretensioner assembly 800, a mechanical end assembly 900, a main gear 901, a track groove 902, a damping elastic sheet 903, an outer gear ring 904, a wedge-shaped fixture block 905, a guide chamber 906, a pressure bearing surface 907, a locking triggering protrusion 908, a force application guide surface 11, an outer cover cap 12, a coil spring cover plate 121, a spring mounting part 122, a magnet mounting part 13, a positioning cover plate 14, a Hall sensor 15 and a magnet.

Detailed Description

According to an embodiment of the present invention, there is provided a seatbelt retractor driven by an electric motor, as shown in fig. 1 to 34, including an electric motor 600, a reduction mechanism assembly 200, a main gear 900, a clutch assembly 300 and a spindle assembly 500, wherein an output end of the electric motor 600 is connected to the reduction mechanism assembly 200, an output end of the reduction mechanism assembly 200 is engaged 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 electric motor 600; the output end of the motor 600 is provided with a driving gear 601, the reduction mechanism assembly 200 adopts a planet carrier gear structure or an eccentric oscillating gear structure, the motor 600 reduces the speed through the reduction mechanism assembly 200 and transmits the motion to the main gear 900, the main gear 900 is connected with the mandrel assembly 500 through the clutch assembly 300, and the mandrel assembly 500 is driven to rotate through the motor 600; when the safety belt pre-tightening device is used, the motor 600 decelerates through the deceleration mechanism assembly 200, the motion is transmitted to the main gear 900, the main gear 900 is connected with the mandrel assembly 500 through the clutch assembly 300, the mandrel assembly 500 is driven to rotate through the motor 600, the safety belt pre-tightening device can be repeatedly used when a safety belt is pre-tightened, and the mandrel assembly 500 can rotate forwards and backwards through the forward and reverse rotation of the motor 600.

In some optional embodiments, the safety belt retractor further comprises a coil spring assembly 100, the coil spring assembly 100 is arranged on one side of the mandrel assembly 500 close to the clutch assembly 300, the coil spring assembly 100 comprises 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 with the shaft end of the mandrel assembly 500, by arranging the coil spring 101, the safety belt wound on the mandrel assembly 500 can be recovered, and the safety belt is ensured to be always attached to a human body; the safety belt retractor further comprises a control unit 400, wherein the control unit 400 is arranged inside the motor-driven safety belt retractor and is used for controlling the motor 600 and the clutch assembly 300, such as stopping rotation control of the motor 600 and the like; the vehicle emergency safety device further comprises a pretensioner assembly 700, wherein the pretensioner assembly 700 is arranged on the outer side of the spindle assembly 500, and the spindle assembly 500 is pre-tightened in case of an emergency of a vehicle, and the motor 600 can be used for pre-tightening.

In some alternative embodiments, the driving structure of the seatbelt retractor may be a motor driving structure for a seatbelt, and the reduction mechanism assembly 200 of the first planetary carrier gear structure type includes a planetary carrier gear assembly 201 and a step gear 202, the step gear 202 includes an external driving gear 2021 and a primary driven gear 2022, and the external driving gear 2021 and the primary driven gear 2022 are coaxially and integrally provided; the driving gear 601 is meshed with the first-stage driven gear 2022, and the driving external gear 2021 is connected with the planet carrier gear assembly 201; when the driving gear 601 rotates, the driving gear 900 rotates through the first-stage driven gear 2022, the driving external gear 2021 and the planet carrier gear assembly 201, the driving gear 900 is connected with the mandrel assembly 500 through the clutch assembly 300, and the mandrel assembly 500 is driven to rotate through the motor 600; by adopting the motor 600, the main gear 900 is rotated through the driving gear 601 at the output end of the motor 600, the first-stage driven gear 2022, the driving external gear 2021 and the planet carrier gear assembly 201, the main gear 900 is connected with the mandrel assembly 500 through the clutch assembly 300, the mandrel assembly 500 is driven to rotate through the motor 600, the safety belt can be repeatedly used when being pre-tightened, and the mandrel assembly 500 can be rotated forward and backward through the forward and backward rotation of the motor 600; the planet carrier gear assembly 201 further comprises a common planet gear 2011, and the common planet gear 2011 is meshed with the driving external gear 2021, wherein the common planet gear 2011 is arranged on the circumferential outer side of the driving external gear 2021, and drives the common planet gear 2011 to rotate through the rotation of the driving external gear 2021; the number of the common planet gears 2011 is one or more, and when the number of the common planet gears 2011 is more than one, for example, the number of the common planet gears 2011 can be 3 to 5, the common planet gears are uniformly distributed along the circumferential direction of the driving external gear 2021, and the number of the common planet gears 2011 is three; the planet carrier gear assembly 201 further comprises a planet gear internal gear 2012, the planet gear internal gear 2012 is fixed on a base 2013 of the speed reducing mechanism assembly 200 and is connected by a spline 2015, and when the common planet gear 2011 rotates, the planet gear internal gear 2012 is fixed; the planet carrier gear assembly 201 further comprises a planet carrier gear 2014, the planet carrier gear 2014 is arranged on one side of the planet gear internal gear 2012, which is far away from the base 2013 in the axial direction and can be meshed and connected with the main gear 900; a cylinder 2016 is arranged on the surface of the planet carrier gear 2014 facing the common planet gear 2011, the cylinder 2016 is arranged opposite to the axis of the common planet gear 2011, the cylinder 2016 is arranged at the axis of the common planet gear 2011 in an inserting manner, when the common planet gear 2011 rotates, the cylinder 2016 and the common planet gear 2011 synchronously rotate, and the planet carrier gear 2014 is driven to rotate through the rotation of the cylinder 2016, wherein the number of the cylinders 2016 is the same as that of the common planet gears 2011, and can be three to five, and the specific position of the cylinders 2016 corresponds to the center of the common planet gear 2011; the motor 600 is a brush direct current motor with a voltage of 12 v/24 v/36 v/48 v and a maximum current of 40 a, and has the characteristics of quick start, timely braking, capability of smoothly regulating the speed in a large range, relatively simple control circuit and the like.

In some alternative embodiments, the driving structure of the seatbelt retractor may also be a high-torque motor driving structure for a seatbelt, the speed reducing mechanism assembly 200 of the second embodiment of the eccentric oscillating gear structure includes an oscillating 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 provided; the driving gear 601 is meshed with the first-stage transmission gear 2042, the eccentric shaft 2041 is connected with the swinging gear assembly 203, and the swinging gear assembly 203 is connected with the second-stage transmission gear 205; when the driving gear 601 rotates, the main gear 900 rotates through the first-stage transmission gear 2042, the swing gear assembly 203 and the second-stage transmission gear 205, the main gear 900 is connected with the mandrel assembly 500 through the clutch assembly 300, and the mandrel assembly 500 is driven to rotate through the motor 600; when the driving gear 601 rotates, the main gear 900 rotates through the first-stage transmission gear 2042, the swing gear assembly 203 and the second-stage transmission gear 205, the main gear 900 is connected with the mandrel assembly 500 through the clutch assembly 300, the mandrel assembly 500 is driven to rotate through the motor 600, the spindle assembly can be repeatedly used when a safety belt is pre-tightened, the mandrel assembly 500 can rotate forward and backward through forward and backward rotation of the motor 600, and the spindle assembly 500 has the characteristics of simple structure and high transmission torque; the eccentric oscillating gear structure comprises an oscillating gear assembly 203, an eccentric structure assembly 204 and a secondary transmission gear 205, the eccentric structure assembly 204 comprises 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 with the first-stage transmission gear 2042, the eccentric shaft 2041 is connected with the swinging gear assembly 203, and the swinging gear assembly 203 is connected with the second-stage transmission gear 205; a plurality of through holes 2051 are formed in the end face of the secondary transmission gear 205, and the through holes 2051 are uniformly distributed around the axis of the secondary transmission gear 205; the oscillating gear assembly 203 includes an oscillating gear 2031 and a transmission member 2032, the transmission member 2032 is disposed on a surface of the oscillating gear 2031 facing the secondary transmission gear 205, and the transmission member 2032 is disposed opposite to the through hole 2051; by arranging the transmission member 2032 and the through hole 2051, the rotation of the oscillating gear 2031 can be transmitted to the rotation of the secondary transmission gear 205, so that the transmission of the motion is realized; the transmission member 2032 is cylindrical, and the diameter of the transmission member 2032 is smaller than that of the through hole 2051; the transmission piece 2032 is cylindrical, so that the whole transmission process is stable, and compared with a circular truncated cone or a truncated pyramid, the contact between the transmission piece 2032 and the through hole 2051 can be increased; the number of the through holes 2051 is 6, and the number of the through holes 2051 is the same as that of the transmission pieces 2032; of course, the number of the transmission pieces 2032 may also be less than the number of the through holes 2051, and the transmission pieces 2032 are inserted into the through holes 2051 during the transmission process, and during the rotation of the oscillating gear 2031, the transmission pieces 2032 are driven to rotate synchronously, so as to drive the secondary transmission gear 205 to rotate; the high-torque motor driving structure for a seatbelt further includes a reduction ring gear 206, the reduction ring gear 206 is disposed outside the circumferential direction of the swing gear 2031, and is engaged with the swing gear 2031; the reduction internal gear 206 is fixed on the base of the reduction mechanism assembly 200 by adopting a spline structure; by providing the reduction internal gear 206, the reduction of the reduction mechanism assembly 200 is realized by cooperation with the oscillating gear 2031; the number of teeth of the reduction internal gear 206 is larger than that of the oscillating gear 2031; wherein, the number of teeth of the reduction internal gear 206 is 36, the number of teeth of the oscillating gear 2031 is 32 to 35, and the reduction of the reduction mechanism component is realized by setting the difference of the number of teeth between the reduction internal gear 206 and the oscillating gear 2031; the swing amplitude of the swing gear assembly 203 is not greater than the eccentric amount of the eccentric structure assembly 204, and the specific relationship between the eccentric amount and the swing amplitude is not limited herein, and in this embodiment, the eccentric structure assembly is used to realize the transmission of the motion, and the multi-stage speed reduction can be realized in the transmission process.

In some alternative embodiments, the first aspect of the clutch assembly 300 of the seatbelt retractor is a friction plate clutch assembly including a main gear 900, a locking mechanism, a transmission wheel 301, a clutch stator 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 with the clutch fixing plate 303, and the other end of the clutch torque plate 304 is connected with 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 and meshed with the transmission wheel 301; when the main gear 900 rotates reversely relative to the clutch fixing plate 303, the locking mechanism is pushed to be in a state of being separated from the driving wheel 301; the clutch torque plate 304 provides friction force required by rotation of the main gear 900 relative to the clutch fixing plate 303 in a mode of generating sliding friction force through continuous contact; the clutch torque plate 304 provides relative friction between the clutch stator 303 and the clutch base 305 in two ways: one is that the clutch torque plate 304 is fixed on the clutch base 305, and there is sliding friction of interference fit between the clutch torque plate 304 and the clutch stator 303; the other is that the clutch torque plate 304 is fixed on the clutch fixing plate 303, and sliding friction in interference fit exists 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, so that the one-way locking performance of the driving wheel 301 by the rotation of the main gear 900 and the driving of the locking mechanism is obviously improved, the extremely high motion synchronism between the main gear 900 and the clutch fixing plate 303 is realized, the friction plate type clutch assembly is simple in structure and good in stability, and the clutch effect of the safety belt retractor is obviously improved; the locking mechanism comprises a plurality of locking blocks 302, the locking blocks 302 are arranged in an annular and equally-spaced array around the axis of the transmission wheel 301, one end of each locking block 302 is rotatably connected with a clutch fixing plate 303, and the other end of each locking block 302 is slidably connected in the main gear 900; the main gear 900 pushes the locking block 302 to be meshed with the transmission wheel 301 in a track groove or guide surface mode; by arranging a plurality of locking blocks 302, the stability of the driving wheel 301 driven by the main gear 900 to rotate at the same time is obviously improved, the vibration is obviously reduced and the noise is obviously reduced in 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 circular ring piece 3043 is a circular ring sheet-shaped structure, the inner ring of the circular ring piece 3043 is fixed with a plurality of inner friction plates 3041, the outer ring of the circular ring piece 3043 is fixed with a plurality of outer fixing pieces 3042, each inner friction plate 3041 inclines towards one side of the outer fixing piece 3042, so as to generate interference fit, the circular ring piece 3043, the inner friction plates 3041 and the outer fixing pieces 3042 in this embodiment are an integrally formed structure, and the material thereof is wear-resistant material, such as wear-resistant plastic or wear-resistant metal; each inner friction plate 3041 is provided with a friction protrusion 3044, the friction protrusion 3044 is arranged on one side of the inner friction plate 3041 close to the outer fixed plate 3042, and the clutch torque plate 304 generates friction by the way that the friction protrusion 3044 contacts with the clutch base 305 or the clutch fixed plate 303 is in sliding contact; the friction protrusion 3044 is an integral structure formed by stamping or casting on the inner friction plate 3041, the integral structure reduces the manufacturing cost of the friction protrusion 3044, and the life of the clutch torque plate 304 is significantly prolonged; the number of the inner friction plates 3041 is the same as that of the outer fixing plates 3042, the inner friction plates 3041 are uniformly arranged in an annular array around the center of the circular ring plate 3043, the inner friction plates 3041 are arranged in one-to-one correspondence with the outer fixing plates 3042, for example, the number of the inner friction plates 3041 and the number of the outer friction plates are 8, the outer fixing plates 3042 are perpendicular to the circular ring plate 3043, and an included angle between the inner friction plates 3041 and the circular ring plate 3043 is an acute angle.

In some optional embodiments, in the friction plate clutch assembly of the first aspect of the clutch assembly 300, a spline slot 3011 is formed on an inner side of the driving wheel 301, the driving wheel 301 is fixed to the spindle assembly 500 through the spline slot 3011, and in addition, the driving wheel 301 and the spindle assembly 500 may be fixed to the spindle assembly 500 through a key connection or the like; an annular protruding part 3031 is arranged on the end face of one side, away from the main gear 900, of the clutch fixing plate 303, a plurality of inner friction plates 3041 are inserted into the inner ring of the annular protruding part 3031, and the friction protrusions 3044 abut against the inner ring of the annular protruding part 3031; a plurality of outer fixing grooves 3051 are formed in one side, close to the clutch torque plate 304, of the clutch base 305, the number of the outer fixing grooves 3051 is the same as that of the outer fixing plates 3042, and the outer fixing plates 3042 of the clutch torque plate 304 are correspondingly inserted and fixed in the outer fixing grooves 3051 of the clutch base 305; an arc-shaped protruding plate is arranged on the inner side of the arc surface between every two adjacent outer fixing grooves 3051, an inner fixing groove 3052 is formed between every two adjacent arc-shaped protruding plates, the inner friction plate 3041 of the clutch torque plate 304 is correspondingly inserted into the inner fixing groove 3052, in the embodiment, a plurality of wedge-shaped fixture blocks 904 are arranged on the main gear 900, the plurality of wedge-shaped fixture blocks 904 jointly limit the clutch fixing plate 303 on one side of the main gear 900, and when the clutch fixing plate 303 is clamped, the clutch fixing plate 303 can rotate relative to the main gear 900; the use principle of the scheme is that the main gear 900 is driven by the motor 600 to rotate relative to the clutch fixing plate 303, the locking mechanism is in contact engagement with the transmission wheel 301 under the action of the main gear 900, the clutch fixing plate 303 and the clutch torque plate 304 are in interference fit and generate friction, the clutch torque plate 304 is fixed on the clutch base 305, so that friction force formed by torque is provided for the clutch fixing plate 303, the friction force facilitates the clutch fixing plate 303 and the main gear 900 to rotate relative to each other, and after 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.

In some alternative embodiments, in a friction plate clutch assembly of the first aspect of the clutch assembly 300, in another possible form, the end surface of the clutch fixing plate 303 on the side away from the main gear 900 is provided with a plurality of outer fixing grooves 3051, the number of the outer fixing grooves 3051 is the same as the number of the outer fixing plates 3042, and the outer fixing plates 3042 of the clutch torque plate 304 are correspondingly inserted and fixed in the outer fixing grooves 3051 of the clutch fixing plate 303; an annular protruding part 3031 is arranged on one side of the clutch base 305 close to the clutch torque plate 304, a plurality of inner friction plates 3041 are inserted into the inner ring of the annular protruding part 3031, and the friction protrusions 3044 abut against the inner ring of the annular protruding part 3031; the principle of use of this embodiment is that the main gear 900 is driven by the motor 600 to rotate relative to the clutch stator 303, the locking mechanism is in contact engagement with the transmission wheel 301 under the action of the main gear 900, the clutch stator 303 and the clutch base 305 are in interference fit and generate friction therebetween, the clutch torque plate 304 is fixed on the clutch stator 303, so as to provide friction force formed by torque to the clutch stator 303, the friction force urges the clutch stator 303 and the main gear 900 to rotate relative to each other, after locking is completed, the main gear 900 pushes the clutch stator 303 to break through the friction force provided by the clutch torque plate 304, so that the main gear 900 drives the clutch stator 303 to rotate continuously.

In some alternative embodiments, the second aspect of the clutch assembly 300 of the seatbelt 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 arranged between the main gear 900 and the clutch fixing plate 303, a one-way clutch spring 306 is arranged between the clutch base 305 and the clutch fixing plate 303, one end of the one-way clutch spring 306 is connected with the clutch fixing plate 303, and the other end of the one-way clutch spring 306 is connected with 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 and meshed with the transmission wheel 301; when the main gear 900 rotates reversely relative to the clutch fixing plate 303, the locking mechanism is pushed to be in a state of being separated from the driving wheel 301; the inner ring of the one-way clutch spring 306 contacts the clutch base 305 to generate friction force, so that the friction force for the clutch fixing plate 303 to rotate relative to the clutch base 305 is provided; when the clutch fixing plate 303 drives the one-way clutch spring 306 to rotate in the forward direction, the friction force between the one-way clutch spring 306 and the clutch base 305 is gradually increased; when the clutch fixing plate 303 drives the one-way clutch spring 306 to rotate reversely, the friction force between the one-way clutch spring 306 and the clutch base 305 is gradually reduced; the working principle is as follows: an outer gear ring 903 is arranged on the outer peripheral side of the main gear 900, the motor 600 is meshed with the outer gear ring 903 through the speed reducing mechanism assembly 200 to drive the main gear 900 to rotate, torque friction force is generated between the clutch fixing plate 303 and the clutch base 305 under the action of the one-way clutch spring 306, the main gear 900 rotates in the forward direction relative to the clutch fixing plate 303, the locking mechanism is driven to be meshed with the transmission wheel 301 in the rotating process of the main gear 900, the main gear 900 continues to rotate, the clutch fixing plate 303 and the main gear 900 rotate continuously at the same time, the clutch fixing plate 303 and the one-way clutch spring 306 are in continuous contact, friction is generated between the clutch fixing plate 303 and the main gear 900; when the main gear 900 is driven by the motor 600 to rotate in the reverse direction, the clutch fixing plate 303 drives the one-way clutch spring 306 to rotate in the reverse direction, the friction force between the one-way clutch spring 306 and the clutch base 305 is reduced, and the locking mechanism is disengaged from the driving wheel 301 under the action of the track groove or the return spring 307 on the main gear 900; it should be noted that spline groove 3011 is formed in the interior of driving wheel 301, and fixing driving wheel 301 on spindle assembly 500 is realized through spline groove 3011; when the locking block 302 is reset by adopting a reset spring 307, a locking fixing plate 308 and a clutch support 309 are also arranged on the clutch fixing plate 303; the beneficial effects in this embodiment are: through the mode that the inner circle of the one-way clutch spring 306 of this embodiment is reduced and then contacts the clutch base 305 or the clutch stator 303 to generate friction, the one-way locking performance of the driving wheel 301 by the rotation driving locking mechanism of the main gear 900 is obviously improved, the extremely high motion synchronism between the main gear 900 and the clutch stator 303 is realized, the spring type clutch assembly is simple in structure and good in stability, and the clutch effect of the safety belt retractor is obviously improved.

In some optional embodiments, in the spring-type clutch assembly of the second aspect of the clutch assembly 300, 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 protruding end 3061, an annular protrusion is provided on an end surface of the clutch fixing plate 303, which is away from the locking mechanism, the one-way clutch spring 306 is embedded in the annular protrusion, an inner ring of the annular protrusion is provided with a clutch spring clamping groove 3034, and the clutch spring protruding end 3061 is inserted in the clutch spring clamping groove 3034; preferably, the one-way clutch spring 306 is formed by integrally bending an elastic steel wire, the number of spiral turns of the one-way clutch spring 306 is greater than 2, and the diameter of the outer ring of the one-way clutch spring 306 is smaller than that of the inner ring of the annular protrusion; by arranging the clutch spring clamping groove 3034, the relative rotation between the one-way clutch spring 306 and the clutch fixing plate 303 is realized, and the locking phenomenon caused by overlarge friction force between the one-way clutch spring 306 and the clutch base 305 is avoided; the width of the clutch spring clamping groove 3034 is larger than the diameter of the clutch spring extension end 3061, and the width of the clutch spring clamping groove 3034 refers to the width extending along the circumferential direction; the number of the clutch spring clamp grooves 3034 is multiple, the clutch spring clamp grooves 3034 are arranged in an annular equal-interval array around the axis of the clutch fixing plate 303, and the clutch spring extension end 3061 is inserted into one clutch spring clamp groove 3034; the advantage of providing a plurality of clutch spring clamp grooves 3034 is that the one-way clutch spring 306 is convenient to replace, avoiding the failure of the clamp grooves; an annular friction part 3053 is arranged on the side surface 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 part 3053; when the clutch fixing piece 303 drives the clutch spring extension end 3061 to rotate positively, the friction force between the inner ring of the one-way clutch spring 306 and the outer periphery of the annular friction part 3053 is gradually increased; when the clutch fixing plate 303 drives the clutch spring extending end 3061 to rotate reversely, the friction force between the inner ring of the one-way clutch spring 306 and the outer periphery of the annular friction part 3053 is gradually reduced, and the annular friction part 3053 is sleeved on the outer periphery of one end of the mandrel assembly 500 of the safety belt retractor; by arranging the annular friction part 3053, reasonable friction force is generated between the one-way clutch spring 306 and the clutch base 305, and in addition, the one-way clutch spring 306 is guided and limited; an inner ring of the one-way clutch spring 306 is in interference fit with an outer peripheral side of the annular friction part 3053, and specifically, the one-way clutch spring 306 can rotate relative to the annular friction part 3053; the extension direction of the extension end 3061 of the clutch spring is the radial direction of the one-way clutch spring 306, the extension direction of the extension end 3061 of the clutch spring is set to extend along the radial direction of the one-way clutch spring 306, the stress uniformity of the one-way clutch spring 306 is improved, the phenomenon that the one-way clutch spring 306 is separated from the clutch spring clamping groove 3034 is avoided, and the stability of the one-way clutch spring 306 in the using process is improved; the spiral steel wire structure of the one-way clutch spring 306 is an equal-pitch spiral curve, the pitch of the one-way clutch spring 306 is equal to the diameter of the steel wire forming the one-way clutch spring 306, through the arrangement of the embodiment, the one-way clutch spring 306 is not easy to deform, has a long service life, and meanwhile, the friction force change accuracy is remarkably improved; the locking mechanism comprises a plurality of locking blocks 302, the locking blocks 302 are arranged in an annular and equally-spaced array around the axis of the transmission wheel 301, one end of each locking block 302 is rotatably connected with a clutch fixing plate 303, and the other end of each locking block 302 is slidably connected in the main gear 900; when the main gear 900 rotates in the forward direction, the plurality of locking blocks 302 are pushed to be in meshing contact with the transmission wheel 301; when the main gear 900 rotates reversely, the plurality of latch blocks 302 are disengaged from the driving wheel 301; specifically, the main gear 900 pushes the locking block 302 to engage with the transmission wheel 301 by means of a track groove or a guide surface; by providing a plurality of locking blocks 302, the stability of the driving wheel 301 driven by the main gear 900 to rotate at the same time is significantly improved, the vibration during the locking process is significantly reduced, and the noise is significantly reduced.

In some alternative embodiments, a friction plate clutch assembly or a spring clutch assembly of the seat belt retractor is used alternatively, and the following two different schemes exist in the locking mechanisms of the friction plate clutch assembly and the spring clutch assembly respectively.

In some alternative embodiments, the locking mechanism of the first aspect includes a main gear 900, a transmission wheel 301, a locking block 302, a return spring 307, and a clutch stator 303; a guide cavity is formed in the end face of one side of the main gear 900, one end of the clutch fixing plate 303 is embedded in the guide cavity, at least one locking triggering protrusion 907 is arranged on the inner ring of the main gear 900, and a locking block 302 is correspondingly arranged on each locking triggering protrusion 907; one end of the locking block 302 is rotatably connected to the clutch fixing plate 303, the other end of the locking block 302 is abutted against one end of the return spring 307, the other end of the return spring 307 is abutted against the clutch fixing plate 303, and the combined body 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 forward relative to the clutch fixing plate 303, the locking trigger protrusion 907 pushes the locking block 302 to rotate to be in contact and meshed with the transmission wheel 301; when the main gear 900 rotates reversely relative to the clutch stator 303, the locking block 302 rotates to be separated from the driving wheel 301 under the action of the return spring 307; the locking triggering protrusions 907 are cubic protrusions formed by protruding the inner ring of the main gear 900 towards the center of the circle, the number of the locking blocks 302 is two, the number of the corresponding locking triggering protrusions 907 is also two, the two locking blocks 302 are symmetrically arranged on the outer peripheral side of the driving wheel 301, an outer gear ring 903 is arranged on the outer peripheral side of the main gear 900, in the using process, an output shaft of the motor 600 is meshed with the outer gear ring 903 on the main gear 900 through the speed reducing mechanism assembly 200, preferably, the return spring 307 is a torsion spring, the installation occupied space of the torsion spring is small, the outer gear ring 903 of the main gear 900 is in an involute tooth shape, a spline slot 3011 is formed in the inner side of the driving wheel 301, the fixed connection between the driving wheel 301 and the spindle assembly 500 is achieved through the spline slot 3011, and the spindle; the use principle of the embodiment is that the main gear 900 is driven by the motor 600 to rotate relative to the clutch fixing plate 303, the locking block 302 is in contact engagement with the transmission wheel 301 under the pushing action of the locking trigger bulge 907, and the clutch fixing plate 303 is in 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, the inner ring is sleeved on the clutch base 305, and the inner ring is gradually reduced to generate friction with the clutch base 305 when the one-way clutch spring 306 rotates in a one-way manner; the two modes can provide friction force formed by torque to the clutch fixing plate 303, the friction force urges the clutch fixing plate 303 and the main gear 900 to rotate relatively, and after the locking transmission between 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 effect of this embodiment does: the locking block 302 arranged in the embodiment rotates under the pushing of the locking triggering protrusion 907, so that the locking block 302 is gradually stabilized and meshed with the transmission wheel 301 when the main gear 900 rotates relative to the clutch fixing plate 303 in the use process of the clutch assembly 300, the vibration noise generated by the locking mechanism is obviously reduced in the use process, the stability of the locking mechanism in the operation process is obviously improved, and the one-way rotation locking and reverse resetting functions of the main gear 900 are realized by arranging the reset spring 307.

In some alternative embodiments, in the locking mechanism of the first aspect, the lock block 302 includes a rotating portion 3022 and a lock portion 3024, the rotating portion 3022 is connected to the lock portion 3024, one side of the lock portion 3024 close to the pulley 301 is provided with at least one driving tooth engaged with the pulley 301, a torsion spring notch 3026 is formed in the lock portion 3024, one end of the return spring 307 abutting against the lock block 302 is inserted into the torsion spring notch 3026, in this embodiment, it is preferable that the driving tooth on the lock block 302 is an asymmetric trapezoidal tooth, and the asymmetric trapezoidal tooth is inclined toward the side of the pulley 301 rotating in the forward direction, which has a larger traction force; in addition, the transmission gear can also be in structural forms such as special-shaped gear, sawtooth-shaped gear, involute cylindrical gear and the like; in addition, the torsion spring clamping groove 3026 is U-shaped, and by arranging the torsion spring clamping groove 3026, the separation between one end of the return spring 307 and the locking block 302 is avoided, and the locking block 302 is more reasonably stressed; a locking pressure bearing bulge 3025 is further arranged on the locking portion 3024, and the locking pressure bearing bulge 3025 is positioned on one side, away from the transmission teeth, of the torsion spring clamping groove 3026; when the main gear 900 pushes the locking block 302 to rotate, the locking triggering protrusion 907 abuts against the locking pressure bearing protrusion 3025, the force bearing surface of the locking pressure bearing protrusion 3025 extends along the radial direction of the transmission wheel 301, at the moment, the surface of the locking triggering protrusion 907 in contact with the locking pressure bearing protrusion 3025 extends along the radial direction of the main gear 900, at the moment, the utilization rate of the force applied to the locking block 302 by the main gear 900 is the highest, the stress of the locking block 302 is more reasonable, and the service life is remarkably prolonged; the clutch locking device is characterized by further comprising a locking fixing plate 308, wherein at least one locking fixing hole 3081 is formed in the locking fixing plate 308, at least one first limiting pin 3035 is arranged on the end face, close to the locking block 302, of one side of the clutch fixing plate 303, the locking fixing hole 3081 is correspondingly inserted into the first limiting pin 3035, the locking fixing plate 308 is in an arc shape, an arc-shaped rotating matching groove 3082 is formed in one end of the locking fixing plate 308 in the arc shape, and a rotating part 3022 of the locking block 302 is rotatably connected into the rotating matching groove 3082; preferably, the locking fixing holes 3081 are round holes, the first limit pins 3035 are cylindrical pins, the number of the locking fixing holes 3081 on each locking fixing piece 308 is two, the locking fixing holes are correspondingly inserted into the two first limit pins 3035, and the locking fixing pieces 308 are arranged to play a good supporting role on the locking block 302, so that damage to the clutch fixing piece 303 in the movement process of the locking block 302 is avoided, and the difficulty in part maintenance is reduced; a force application pressure bearing surface 3083 is convexly arranged on the outer arc surface of the locking fixing piece 308, a force application guide surface 908 is arranged on the inner ring of the main gear 900, and the force application guide surface 908 is positioned at the side of the locking trigger protrusion 907; when the main gear 900 pushes the locking block 302 to rotate, the force application guide surface 908 abuts against the force application pressure bearing surface 3083; by arranging the force application guide surface 908 and the force application pressure bearing surface 3083, the synchronism of the joint rotation of the main gear 900 and the clutch fixing plate 303 is improved, and the reduction of the service life of the locking block 302 caused by the overlarge stress of the locking block 302 is reduced; the clutch fixing plate 303 is also provided with at least one second limit pin 3037 on the end surface of one side close to the locking block 302, and the outer side of the second limit pin 3037 is provided with a torsion spring fixing groove 3036 in a surrounding manner; the middle part of the return spring 307 is sleeved on the second limit pin 3037, the return spring 307 is provided with a first leg 3071 and a second leg 3072 which are connected with the middle part of the return spring 307, the first leg 3071 is inserted in the torsion spring clamping groove 3026 of the locking block 302, the second leg 3072 is abutted in the torsion spring fixing groove 3036 of the clutch fixing piece 303, preferably, the second limit pin 3037 is a cylindrical pin, and effective limit on the return spring 307 is realized by arranging the second limit pin 3037; a torsion spring supporting protrusion 3038 is arranged in the torsion spring fixing groove 3036, the torsion spring supporting protrusion 3038 is positioned on one side, away from the first limiting pin 3035, of the second limiting pin 3037, and the middle part of the first leg 3071 abuts against the torsion spring supporting protrusion 3038; through setting up torsional spring support protrusion 3038, realized the supporting role to first leg 3071, improved the homogeneity of torsional spring atress, formed a fulcrum to first leg 3071 in torsional spring support protrusion 3038 department, the dynamics of producing to the restoration of locking piece 302 is more even stable.

In some optional embodiments, the locking mechanism in the first aspect further includes a clutch support 309, the clutch support 309 is a circular ring sheet structure, the clutch support 309 is provided with a first limiting hole 3091 and a second limiting hole 3092, the first limiting hole 3091 is disposed corresponding to the first limiting pin 3035, and the second limiting hole 3092 is disposed corresponding to the second limiting pin 3037; the first limit pin 3035 is inserted in the first limit hole 3091, and the second limit pin 3037 is inserted in the second limit hole 3092; the locking block 302 and the locking fixing block are both positioned between the clutch support 309 and the clutch fixing plate 303, preferably, the first limiting hole 3091 and the second limiting hole 3092 are both round holes, and the clutch support 309 is arranged, so that the locking block 302, the return spring 307 and the locking fixing plate 308 are limited, and the axial movement of the locking block 302, the return spring 307 and the locking fixing plate 308 in the axial direction of the driving wheel 301 is avoided; when the locking piece 302 is a plurality of, a plurality of locking pieces 302 are around the annular equidistant array setting of axis of drive wheel 301, and through setting up a plurality of locking pieces 302, the locking mechanism operation in-process is more stable, and the impact effect is little in the use.

In some alternative embodiments, a locking mechanism of the second aspect includes a main gear 900, a transmission wheel 301, a locking block 302, and a clutch stator 303; a guide cavity 905 is formed in the end face of one side of the main gear 900, one end of the clutch fixing piece 303 is embedded in the guide cavity 905, at least one locking block 302 is arranged between the main gear 900 and the clutch fixing piece 303, at least one track groove 901 is formed in the bottom face of the main gear 900, which is located on the guide cavity 905, and the track grooves 901 and the locking blocks 302 are the same in number and are arranged in a one-to-one correspondence manner; one end of the locking block 302 is rotatably connected with the clutch fixing plate 303, the other end of the locking block 302 is slidably connected in the track groove 901, and a combined body 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 forward relative to the clutch fixing plate 303, the locking block 302 slides in the track groove 901 to be in contact engagement 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 to be in a state of being separated from the contact state with the transmission wheel 301; in a specific embodiment, the number of the locking blocks 302 is two, the number of the 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, the outer peripheral side of the main gear 900 is provided with an outer gear ring 903, in use, an 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 outer gear ring 903 of the main gear 900 is in an involute tooth form, the inner side of the transmission wheel 301 is provided with a spline groove 3011, the fixed connection between the transmission wheel 301 and the spindle assembly 500 is realized through the spline groove 3011, and the spindle assembly 500 is used for realizing the retraction of a safety belt; the principle of use of this embodiment is that the main gear 900 is driven by the motor 600 to rotate relative to the clutch stator 303, the locking block 302 is in contact engagement with the transmission wheel 301 under the action of the track groove 901, the clutch stator 303 is in interference fit with the clutch torque plate 304, the clutch torque plate 304 is fixed on the clutch base 305, so as to provide a friction force formed by torque to the clutch stator 303, the friction force urges the clutch stator 303 and the main gear 900 to rotate relative to each other, after locking is completed, the main gear 900 pushes the clutch stator 303 to break through the friction force provided by the clutch torque plate 304, so that the main gear 900 drives the clutch stator 303 to rotate continuously; through the arrangement that the locking block 302 slides in the track groove 901, the locking block 302 is gradually stabilized and meshed with the driving wheel 301 when the main gear 900 rotates relative to the clutch fixing plate 303 in the use process of the clutch assembly 300, in the use process, the vibration noise generated by the locking mechanism is obviously reduced, the stability of the locking mechanism in the operation process is obviously improved, and the one-way rotation locking function of the main gear 900 is realized.

In some optional embodiments, in the locking mechanism of the second aspect, when there are a plurality of locking blocks 302, the plurality of locking blocks 302 are arranged in an annular equal-spacing array around the axis of the transmission wheel 301, and there are two locking blocks 302, and in addition, the number of locking blocks 302 may also be one, three or even more, and the greater the number of locking blocks 302, the higher the stability of the transmission; the lock block 302 includes a rotation portion 3022, a connecting portion 3023, a lock portion 3024, and a slide protrusion 3021; the rotating part 3022 is connected with the locking part 3024 through a connecting part 3023, a sliding protrusion 3021 is arranged on the side surface of the connecting part 3023, the sliding protrusion 3021 is slidably connected with the track groove 901, the rotating part 3022 is rotatably connected with the clutch fixing piece 303, at least one driving tooth meshed with the driving wheel 301 is arranged on the locking part 3024, and preferably, the sliding protrusion 3021 is of a cylindrical pin structure; the main gear 900 is further provided with a shock absorption elastic sheet 902, one end of the shock absorption elastic sheet 902 is fixed at one end of the track groove 901, the other end of the shock absorption elastic sheet 902 extends towards the other end of the track groove 901 and inclines towards the inside of the track groove 901, the shock absorption elastic sheet 902 is abutted with the sliding protrusion 3021, preferably, the shock absorption elastic sheet 902 and the main gear 900 are in an integrated structure, and noise generated in the working process of the locking block 302 is obviously reduced under the elastic limiting effect of the shock absorption elastic sheet 902 by the arrangement of the shock absorption elastic sheet 902; the extension line of the track groove 901 is an arc curve, the curvature center of the arc curve is positioned at the eccentric position of the circle center of the main gear 900, the shock absorption elastic sheet 902 is arc-shaped, in addition, the track groove 901 can also be in an involute shape, and the track groove 901 is set to be in an arc curve shape, so that the moving stability of the sliding protrusion 3021 of the locking block 302 in the track groove 901 is enhanced, and the impact generated in the moving process is reduced; the tooth form on the outer periphery of the driving wheel 301 is asymmetric trapezoidal teeth, the asymmetric trapezoidal tooth form on the outer periphery of the driving wheel 301 inclines towards one side of the locking part 3024, which is far away from the rotating part 3022, and the driving teeth of the locking part 3024 are asymmetric trapezoidal teeth matched with the tooth form on the outer periphery of the driving wheel 301; through the structural form of the asymmetrical trapezoidal teeth, the locking block 302 and the transmission wheel 301 have extremely high meshing force, and in addition, the tooth form of the outer side of the transmission wheel 301 can also be an involute cylindrical tooth form, a triangular tooth form, a sawtooth tooth form, a rectangular tooth or other special-shaped teeth; a pressure bearing surface 906 is arranged in a guide cavity 905 of the main gear 900, the pressure bearing surface 906 is abutted with the outer side surface of the locking part 3024, which is far away from the connecting part 3023, 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 and the locking block 302 is in a locking state, the stress direction of the locking block 302 is along the tangential direction of the outer edge of the transmission wheel 301, and the stress is optimal at the moment; in addition, the direction of extension of pressure-bearing surface 906 may also be at an angle to the radial direction of drive wheel 301; the outer edge of one side of the main gear 900, which is positioned in the guide cavity 905, is also provided with a plurality of wedge-shaped fixture blocks 904, the wedge-shaped fixture blocks 904 are clamped on the end face of one side of the clutch fixing plate 303, which is away from the main gear 900, and through the arrangement of the wedge-shaped fixture blocks 904, the deviation between the clutch fixing plate 303 and the main gear 900 is effectively avoided, and the stability of the contact operation of the two is obviously enhanced; the end face of the clutch fixing piece 303, which is positioned on the inner side of the guide chamber 905, is provided with at least one limiting protrusion 3032, each limiting protrusion 3032 is provided with a limiting groove 3033 with one open end, the rotating part 3022 of the lock block 302 is rotatably connected with the closed end of the limiting groove 3033, the lock part 3024 of the lock block 302 extends out of the open end of the limiting groove 3033, the limiting groove 3033 is a V-shaped groove, the width of the open end of the limiting groove 3033 is greater than that of the closed end of the limiting groove 3033, and by arranging the limiting groove 3033, the excessive deflection angle of the lock block 302 is avoided, and the impact phenomenon generated in the use process of; an annular protruding part 3031 is arranged on the end face of one side of the clutch fixing plate 303, which faces away from the main gear 900, the annular protruding part 3031 is of a cylindrical structure, the annular protruding part 3031 is in contact with the clutch torque plate 304, a certain friction force exists between the annular protruding part 3031 and the clutch torque plate 304, and the clutch torque plate 304 is fixed on the clutch base 305.

The locking mechanism of the first aspect or the locking mechanism of the second aspect may be provided in one friction plate type clutch assembly of the first aspect of the clutch assembly 300 of the seatbelt retractor of the above-described embodiment, and similarly, the locking mechanism of the first aspect or the locking mechanism of the second aspect may be provided in one spring type clutch assembly of the second aspect of the clutch assembly 300 of the above-described embodiment.

In some optional embodiments, the seatbelt retractor further includes a triggering structure for a seatbelt, including a magnet 15 and a hall sensor 14, the magnet 15 is disposed on a side of the cover plate 12 of the coil spring facing the coil spring, the hall sensor 14 is disposed on the base 2013, the base 2013 is provided with a first groove 20131, the magnet 15 moves along the first groove 20131 under the action of the coil spring 101, 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, so that the hall sensor is triggered, the motor is stopped, the coil spring 101 is prevented from being damaged, and the phenomenon that the coil spring 101 is damaged when the limit position of the coil spring 101 is exceeded is avoided; the coil spring cover plate 12 is also provided with a spring mounting part 121, and the spring mounting part 121 extends along the tangential direction of the circumference of the coil spring cover plate 12; the number of the spring mounting portions 121 is one, one end of the spring 102 is fixed on the spring mounting portion 121, and part of the spring 102 is sleeved on the outer surface of the spring mounting portion 121; the spring mounting part 121 is cylindrical or truncated cone-shaped, and when the spring mounting part 121 is truncated cone-shaped, one end close to the coil spring cover plate 12 is a big end; the spring mounting part 121 is cylindrical or truncated cone-shaped, so that the spring 102 is not hindered by the side surface of the spring mounting part 121 in the compression process, and the whole compression and expansion processes of the spring 102 are smooth and stable; the end surface of the base 2013 opposite to the coil spring cover plate 12 is provided with a second groove 20132, when the coil spring cover plate 12 rotates, the spring mounting part 121 can move in the second groove 20132, and the spring 102 is compressed or loosened; the space between the second groove 20132 and the spring mounting portion 121 is the movable space of the spring 102; the triggering structure for the safety belt further comprises a positioning cover plate 13, and the positioning cover plate 13 is arranged between the coil spring cover plate 12 and the base 2013; the positioning cover plate 13 is mainly arranged to facilitate installation of the coil spring cover plate 12 and the coil spring 101; the control unit 400 is connected with the hall sensor 14 and used for turning off the motor 600 according to the signal sent by the hall sensor 14; here, the control unit 400 is used to control the start and stop of the motor 600 and the magnitude of the rotation speed; the triggering structure for the safety belt further comprises a magnet mounting part 122, wherein one end of the magnet mounting part 122 is fixed on the edge of the coil spring cover plate 12 and extends along the central axial direction of the coil spring cover plate 12 in the direction close to the hall sensor 14; by arranging the magnet mounting part 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 part 122 is cylindrical, truncated cone-shaped or rectangular, and in the actual use process, the magnet mounting part 122 can also be in other shapes as long as the distance between the magnet 15 and the hall sensor 14 is closer; the magnet 15 is embedded in the end of the magnet mounting portion 122; by adopting the installation mode, the condition that the magnet 15 falls off can be avoided, and the phenomenon that the triggering structure fails due to the falling off of the magnet 15 is avoided; when the spring 102 is in a compressed limit state, the magnet 15 is opposite to the hall sensor 14, the hall sensor 14 is triggered, the control unit 400 stops the operation of the motor 600 according to a signal of the hall sensor 14, and avoids exceeding a limit position of the coil spring 101, the coil spring cover plate 12 rotates reversely under the action of the spring 102, so that the coil spring 101 is opened to a certain extent, the magnet 15 is not opposite to the hall sensor 14, that is, the magnet 15 is in a non-triggered position; the first groove 20131 and the second groove 20132 are respectively arranged on two sides of a circular ring in the base 2013, and the shapes of the first groove 20131 and the second groove 20132 are arc-shaped grooves; an outer cover 11 is further included, and the outer cover 11 is used to enclose the reduction mechanism assembly 200 and the coil spring cover plate 12.

In some alternative embodiments, the seatbelt retractor further has a shearing assembly for a seatbelt, including a pin 501 and a pin hole 104, wherein the pin 501 is disposed at an end of the spindle assembly 500 near the spindle head of the coil spring assembly 100, and the pin hole 104 is disposed on the spindle head of the coil spring assembly 100; alternatively, pin 501 is disposed at one end of the head of coil spring assembly 100 and pin hole 104 is disposed at one end of mandrel assembly 500 proximate to the head of coil spring assembly 100; pin hole 104 is opposite pin 501; when the head of the coil spring assembly 100 is attached to the mandrel assembly 500, the pin 501 is inserted into the pin hole 104; by arranging the pin 501 and the pin hole 104, when the motor structure is used for driving the safety belt retractor to enable two ends of the mandrel component 500 to be simultaneously fixed and locked, the mandrel component 500 can be cut off when being locked to reach a certain force value, so that the mandrel component can continue to perform force limiting control to relieve the pressure of the safety belt on the chest of a passenger; the number of the pins 501 is one or more, and the pins are arranged on the end face of the mandrel assembly 500; the number of pin holes 104 is the same as the number of pins 501, and the pin holes 104 are located opposite the respective pins 501. The number of pins 501 is related to the force required for shearing, and the number of pins 501 can be selected to be smaller when the force required for shearing is smaller. For example, one pin 501 may be selected when the setting mandrel assembly 500 is locked up to 75 newtons, and two pins 501 may be selected when the setting mandrel assembly 500 is locked up to 150 newtons, with the two pins 501 being in the same line with the center of the end face of the mandrel assembly 500; a protrusion 103 is formed on an inner surface of the coil spring assembly 100 in an axial direction, a pin hole 104 is provided on the protrusion 103 of the coil spring assembly 100, a cross section of the protrusion 103 has a circular arc shape, and the pin hole 104 is provided along the axial direction of the protrusion 103. The pin 501 is cylindrical, the pin hole 104 is circular, the diameter of the pin hole 104 is matched with that of the pin 501, or the pin 501 is in a truncated cone shape, the large end of the pin 501 is in contact with the mandrel assembly 500, the shape and the size of the pin hole 104 are matched with those of the pin 501, or the pin 501 is in a rectangular body, the cross section of the pin hole 104 is in a rectangular shape, the size of the pin hole 104 is matched with that of the pin 501, or the pin 501 is in a pyramid shape, and the size of the pin hole 104 is matched with those of the pin. When the pin 501 is selected, the pin 501 may have other shapes, and only needs to be matched with the shape of the pin hole 104, wherein the size of the pin hole 104 is slightly larger than that of the pin 501, so that the pin 501 can normally enter the pin hole 104. When the number of the pins 501 is one, the center position thereof is set to a non-center position of the end surface of the spindle assembly 500. When the number of the pins 501 is multiple, the multiple pins 501 are uniformly distributed on the end surface of the mandrel assembly 500 along the circle center of the end surface of the mandrel assembly 500, wherein the number of the pins 501 is two, and other numbers of pins can be selected to be arranged as required, such as 3 or 4 pins, and the distance between the center position of the pin 501 and the circle center position of the end surface of the mandrel assembly 500 is not specifically limited. The pin 501 is made of metal or plastic. When the material of the pin 501 is selected, it may be the same as that of the mandrel assembly 500, and obtained by an integral forming process, or may be a different material and fixed on the end surface of the mandrel assembly 500 by welding or bonding.

In some alternative embodiments, the seatbelt retractor further comprises a mechanical end assembly 800, the mechanical end assembly 800 being disposed on a side of the spindle assembly 500 proximate to the pretensioner assembly 700; the mechanical end assembly 800 comprises a sensor assembly and a locking structure, wherein the sensor assembly comprises a vehicle sensor, a belt sensor and a tilt angle sensor; the sensor assembly can sense emergency situations occurring in the vehicle, gas generating agents are triggered in time, and the locking mechanism can rapidly lock the retractor and can buffer the pressure of the safety belt.

Claims (10)

1. A locking mechanism is characterized by comprising a main gear, a transmission wheel, a locking block and a clutch fixing piece; a guide cavity is formed in the end face of one side of the main gear, one end of the clutch fixing piece is embedded in the guide cavity, at least one locking block is arranged between the main gear and the clutch fixing piece, at least one track groove is formed in the bottom face of the main gear, located on the guide cavity, and the track grooves and the locking blocks are the same in number and are arranged in a one-to-one correspondence mode; one end of the locking block is rotatably connected with the clutch fixing piece, the other end of the locking block is connected in the track groove in a sliding manner, and a combined body of the main gear and the clutch fixing piece is sleeved on the outer peripheral side of the driving wheel; when the main gear rotates forward relative to the clutch fixing plate, the locking block slides in the track groove to be in contact and meshed with the transmission wheel; when the main gear rotates reversely relative to the clutch fixing plate, the locking block slides in the track groove to be in a state of being separated from the driving wheel.

2. A lock mechanism according to claim 1, wherein when there are a plurality of said blocks, the blocks are arranged in an annular equi-spaced array about the axis of the drive wheel.

3. The lock mechanism as claimed in claim 1, wherein the lock block includes a rotation portion, a connecting portion, a lock portion and a slide projection; the rotating portion is connected with the locking portion through the connecting portion, the sliding protrusion is arranged on the side face of the connecting portion and is in sliding connection with the track groove, the rotating portion is in rotating connection with the clutch fixing piece, and at least one transmission tooth meshed with the transmission wheel is arranged on the locking portion.

4. The locking mechanism as claimed in claim 3, wherein the main gear further comprises a shock absorbing resilient tab, one end of the shock absorbing resilient tab is fixed to one end of the track slot, the other end of the shock absorbing resilient tab extends towards the other end of the track slot and inclines towards the inside of the track slot, and the shock absorbing resilient tab abuts against the sliding protrusion.

5. The lock mechanism as claimed in claim 4, wherein the track groove has an extension line in the shape of a circular arc having a center of curvature eccentric to a center of the main gear, and the shock absorbing resilient piece has a circular arc shape.

6. A locking mechanism according to claim 3, wherein the peripheral side of the drive wheel has a profile adapted to the profile of the drive teeth of the locking portion.

7. A locking mechanism according to claim 3, wherein a pressure bearing surface is provided in the pilot chamber of the main gear, the pressure bearing surface abutting an outer side surface of the locking portion facing away from the connecting portion, the pressure bearing surface extending in a radial direction of the drive wheel.

8. The locking mechanism as claimed in claim 7, wherein a plurality of wedge-shaped blocks are further disposed on an outer edge of the main gear on one side of the guiding chamber, and the wedge-shaped blocks are engaged with an end surface of the clutch fixing piece on one side away from the main gear.

9. The locking mechanism of claim 8, wherein the clutch fixing piece has at least one limiting protrusion on an end surface of the clutch fixing piece inside the guiding cavity, each limiting protrusion has a limiting groove with an open end, the rotating portion of the locking block is rotatably connected to a closed end of the limiting groove, the locking portion of the locking block extends out of the open end of the limiting groove, and the limiting groove is a V-shaped groove with a width of the open end larger than that of the closed end.

10. A seatbelt retractor, comprising the locking mechanism according to any one of claims 1 to 9.

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