Motor-driven safety retractor

Abstract

The present invention discloses a motor-driven safety retractor, comprising a motor, a reduction mechanism assembly, a main gear, a clutch assembly and a core shaft assembly, wherein the output end of the motor is connected to the reduction mechanism assembly, the output end of the reduction mechanism assembly is meshed with the main gear, the main gear is connected to the core shaft assembly through the clutch assembly, and the core shaft assembly is driven to rotate by the motor; wherein the output end of the motor is provided with a driving gear, the reduction mechanism assembly adopts a planetary gear structure or an eccentric swing gear structure, the motor is decelerated by the reduction mechanism assembly and the motion is transmitted to the main gear, the main gear is connected to the core shaft assembly through the clutch assembly, and the core shaft assembly is driven to rotate by the motor, and the motor can be reused when pre-tightening the safety belt, and the forward and reverse rotation of the core shaft assembly can be realized by the forward and reverse rotation of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of safety belts, and in particular to a motor-driven safety retractor. Background Art

[0002] Seat belts are essential safety devices in cars. They can firmly fasten occupants to their seats in the event of a vehicle collision or emergency braking. They protect the safety of people in the event of a vehicle accident and are an important part of the passive safety system. In the existing technology, pyrotechnic pretensioners are usually used for ignition and detonation. Since pyrotechnic pretensioners use an explosive gas generator to drive the webbing to rewind, they cannot be reused. Once detonated, they must be replaced as a whole, resulting in high costs. They are disposable and irreversible, which leads to limitations in their use. Summary of the Invention

[0003] To this end, the present invention provides a motor-driven safety retractor to solve the problems of non-reusability, irreversibility and high cost of pyrotechnic pretensioners.

[0004] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] According to the present invention, a motor-driven safety retractor is provided, comprising a motor, a reduction mechanism assembly, a main gear, a clutch assembly, and a spindle assembly, wherein the output end of the motor is connected to the reduction mechanism assembly, the output end of the reduction mechanism assembly is meshed with the main gear, the main gear is connected to the spindle assembly via the clutch assembly, and the spindle assembly is driven to rotate by the motor;

[0006] Among them, the output end of the motor is provided with a driving gear, and the reduction mechanism assembly adopts a planetary gear structure or an eccentric swing gear structure. The motor is decelerated by the reduction mechanism assembly and the motion is transmitted to the main gear. The main gear is connected to the core shaft assembly through the clutch assembly, so that the core shaft assembly is driven to rotate by the motor.

[0007] Furthermore, the motor-driven safety retractor further includes a coil spring assembly, which is arranged on a side of the core shaft assembly close to the clutch assembly.

[0008] Furthermore, the coil spring assembly includes a coil spring cover plate and a coil spring, the coil spring is arranged in the coil spring cover plate, and the coil spring is connected to the shaft end of the core shaft assembly.

[0009] Furthermore, the motor-driven safety retractor further includes a control unit, which is arranged inside the motor-driven safety retractor and is used to control the motor and the clutch assembly.

[0010] Furthermore, the motor-driven safety retractor further includes a pretensioner assembly, which is arranged on the outside of the core shaft assembly and pretensions the core shaft assembly when an emergency occurs in the vehicle.

[0011] Furthermore, the planetary carrier gear structure includes a planetary carrier gear assembly and a stepped gear, the stepped gear includes a driving external gear and a primary driven gear, and the driving external gear and the primary driven gear are coaxially and integrally arranged.

[0012] Furthermore, the planetary carrier gear assembly further includes a common planetary gear, and the common planetary gear is meshedly connected with the driving external gear.

[0013] Furthermore, the eccentric swing gear structure includes a swing gear assembly, an eccentric structure assembly and a secondary transmission gear, the eccentric structure assembly includes an eccentric shaft and a primary transmission gear, and the eccentric shaft and the primary transmission gear are integrally arranged; the driving gear is meshed and connected with the primary transmission gear, the eccentric shaft is connected with the swing gear assembly, and the swing gear assembly is connected with the secondary transmission gear.

[0014] Furthermore, the motor-driven safety retractor further includes a mechanical end assembly, and the mechanical end assembly is arranged on a side of the core shaft assembly close to the pretensioner assembly.

[0015] Furthermore, the mechanical end assembly 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.

[0016] The present invention has the following advantages:

[0017] The motor-driven safety retractor provided by the present invention is decelerated by the motor through the deceleration mechanism assembly and the motion is transmitted to the main gear. The main gear is connected to the core shaft assembly through the clutch assembly, so that the core shaft assembly is driven to rotate by the motor. When pre-tightening the seat belt, it can be reused, and the forward and reverse rotation of the core shaft assembly can be achieved by the forward and reverse rotation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0020] Figure 1 A schematic diagram of the overall structure of a motor-driven seat belt retractor according to some embodiments of the present invention;

[0021] Figure 2 A schematic diagram of a transmission structure of a motor drive structure for a seat belt according to some embodiments of the present invention;

[0022] Figure 3 A schematic diagram of the transmission structure of a motor drive structure for a seat belt according to some embodiments of the present invention (excluding the planetary carrier gear);

[0023] Figure 4 A schematic diagram of a transmission structure of a motor drive structure for a seat belt according to some embodiments of the present invention (with a base);

[0024] Figure 5 A schematic structural diagram of a stepped gear according to some embodiments of the present invention;

[0025] Figure 6 A schematic structural diagram of a planetary carrier gear according to some embodiments of the present invention;

[0026] Figure 7 A schematic diagram of a transmission structure of a high-torque motor drive structure for a seat belt according to some embodiments of the present invention;

[0027] Figure 8 A schematic diagram of a high-torque motor drive structure for a seat belt according to some embodiments of the present invention;

[0028] Figure 9 A schematic diagram of a high-torque motor drive structure for a seat belt according to some embodiments of the present invention (excluding the secondary transmission gear);

[0029] Figure 10 A schematic structural diagram of an eccentric structural assembly according to some embodiments of the present invention;

[0030] Figure 11 A schematic diagram of an exploded structure of a seat belt retractor according to some embodiments of the present invention;

[0031] Figure 12 A schematic structural diagram of a seat belt retractor according to some embodiments of the present invention (without the outer cover);

[0032] Figure 13 This is a schematic structural diagram of a coil spring cover plate according to some embodiments of the present invention;

[0033] Figure 14 A schematic diagram of a trigger structure for a safety belt in a triggered state according to some embodiments of the present invention;

[0034] Figure 15 A schematic diagram of a trigger structure for a safety belt in a non-triggering state according to some embodiments of the present invention;

[0035] Figure 16 Schematic diagram of the structure of a shearing assembly for a safety belt according to some embodiments of the present invention.

[0036] Figure 17 A structural diagram of a clutch torque plate of a friction plate clutch assembly according to some embodiments of the present invention;

[0037] Figure 18 An exploded structural diagram of a friction plate clutch assembly according to some embodiments of the present invention;

[0038] Figure 19 A front view of a friction plate clutch assembly according to some embodiments of the present invention;

[0039] Figure 20 is a cross-sectional view of a friction plate clutch assembly according to some embodiments of the present invention;

[0040] Figure 21 Exploded structural diagrams of a friction plate clutch assembly according to other embodiments of the present invention;

[0041] Figure 22 An exploded structural diagram of a spring-type clutch assembly according to some embodiments of the present invention;

[0042] Figure 23 A plan view of a spring-type clutch assembly according to some embodiments of the present invention;

[0043] Figure 24 A structural diagram of a clutch stator of a spring-type clutch assembly according to some embodiments of the present invention;

[0044] Figure 25 A structural diagram of a one-way clutch spring of a spring-type clutch assembly according to some embodiments of the present invention;

[0045] Figure 26 This is a front structural diagram of a locking mechanism according to a first solution of some embodiments of the present invention;

[0046] Figure 27 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;

[0047] Figure 28This is a structural diagram of a return spring of a locking mechanism according to a first solution of some embodiments of the present invention;

[0048] Figure 29 This is a structural diagram of a clutch fixing plate of a locking mechanism according to the first solution of some embodiments of the present invention;

[0049] Figure 30 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;

[0050] Figure 31 This is an exploded structural diagram of a locking mechanism according to the second solution of some embodiments of the present invention;

[0051] Figure 32 A partial front cross-sectional view of a locking mechanism according to a second solution of some embodiments of the present invention;

[0052] Figure 33 This is a structural diagram of a main gear of a locking mechanism according to the second solution of some embodiments of the present invention;

[0053] Figure 34 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. DETAILED DESCRIPTION

[0054] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0055] 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. The main gear 900 is connected to the core shaft assembly 500 through the clutch assembly 300, so that the core shaft 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. The main gear 900 is connected to the core shaft assembly 500 through the clutch assembly 300, so that the core shaft assembly 500 is driven to rotate by the motor 600. It can be reused when pre-tightening the seat belt, and the forward and reverse rotation of the core shaft assembly 500 can be achieved by the forward and reverse rotation of the motor 600.

[0056] In some optional embodiments, the seat belt retractor further 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 12 and a coil spring 101. The coil spring 101 is arranged in the coil spring cover 12, and the coil spring 101 is connected to the axial end of the core shaft assembly 500. By providing 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.

[0057] In some optional embodiments, the driving structure of the seat belt retractor can be a seat belt motor drive structure. The first scheme of the planetary gear structure reduction mechanism assembly 200 includes a planetary gear assembly 201 and a stepped gear 202, the stepped gear 202 includes a driving external gear 2021 and a first-level driven gear 2022, the driving external gear 2021 and the first-level driven gear 2022 are coaxially integrated; the driving gear 601 is meshed with the first-level driven gear 2022, and the driving external gear 2021 is connected to the planetary gear assembly 201; when the driving gear 601 rotates, the first-level driven gear 2022, the driving external gear 2021 and the planetary gear assembly 201 are connected; The gear 2021 and the planetary carrier gear assembly 201 make the main gear 900 rotate, and the main gear 900 is connected to the core shaft assembly 500 through the clutch assembly 300, so that the core shaft assembly 500 is driven to rotate by the motor 600; by adopting 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 carrier gear assembly 201, the main gear 900 is rotated, and the main gear 900 is connected to the core shaft assembly 500 through the clutch assembly 300, so that the core shaft assembly 500 is driven to rotate by the motor 600. When the seat belt is pre-tightened, It is reusable and can realize the forward and reverse rotation of the core shaft assembly 500 by the forward and reverse rotation of the motor 600; the planetary carrier gear assembly 201 also includes 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 gear 2011 is one or more, and when the number of the common planetary gear 2011 is multiple, such as the number of the common planetary gear 2011 can be 3-5, along the active outer gear 2021, the common planetary gear 2011 is rotated. The outer gears 2021 are evenly distributed in the circumferential direction, and there are three common planetary gears 2011. The planetary carrier gear assembly 201 also includes a planetary gear inner gear 2012, which is fixed to the base 2013 of the reduction mechanism assembly 200 and connected using a spline 2015. When the common planetary gears 2011 rotate, the planetary gear inner gear 2012 is kept stationary. The planetary carrier gear assembly 201 also includes a planetary carrier gear 2014, which is arranged on the side of the planetary gear inner gear 2012 axially away from the base 2013 and can be meshed with the main gear 900.A cylindrical body 2016 is provided on the surface of the planetary carrier gear 2014 facing the common planetary gear 2011. Cylinder 2016 is positioned opposite the axis of the common planetary gear 2011 and inserted into the axis of the common planetary gear 2011. When the common planetary gear 2011 rotates, cylinder 2016 rotates synchronously with the common planetary gear 2011, and the rotation of cylinder 2016 drives the planetary carrier gear 2014 to rotate. The number of cylindrical bodies 2016 is the same as the number of common planetary gears 2011, which can be three to five. Their specific locations correspond to the center of the common planetary gear 2011. Motor 600 is a brushed DC motor with a voltage of 12V, 24V, 36V, or 48V, and a maximum current of 40A. It features fast starting, timely braking, smooth speed regulation over a wide range, and a relatively simple control circuit.

[0058] In some optional embodiments, the driving structure of the seat belt retractor can also be a high-torque motor drive 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, 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 core shaft assembly 500 through the clutch assembly 300, so that the core shaft assembly 500 is driven to rotate by the motor 600; when the driving gear 601 rotates, the main gear 900 is rotated by 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 core shaft assembly 500 through the clutch assembly 300, so that the core shaft 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 core shaft 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, the eccentric shaft 2041 and the primary transmission gear 2042 are integrally arranged; the driving gear 601 is meshed with the primary transmission gear 2042, the eccentric shaft 2041 is connected to the swing gear assembly 203, and the swing gear assembly 203 is connected to 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 cylindrical shape of the transmission member 2032 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 use of a truncated cone or a prism shape; the number of through holes 2051 is 6, and the number of through holes 2051 is the same as the number of the transmission members 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 is meshed with the swing gear 2031; the reduction internal gear 206 is fixed to the base of the reduction mechanism assembly 200 with a spline structure; by setting the reduction internal gear 206 06, by cooperating with the swing gear 2031, deceleration of the speed reduction mechanism assembly 200 is achieved; 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. By setting a tooth number difference between the speed reduction internal gear 206 and the swing gear 2031, deceleration of the speed reduction mechanism assembly is achieved; 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 achieve motion transmission, and multi-stage deceleration can be achieved during the transmission process.

[0059] 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 provided between the main gear 900 and the clutch fixing plate 303, a clutch torque plate 304 is provided 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 The locking mechanism is pushed to a contact and meshing state 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 disengagement state with 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 for the clutch torque plate 304 to provide 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 an interference fit sliding friction 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 this embodiment, which significantly improves the main gear 900 and drives the locking mechanism to achieve a one-way locking performance of the transmission wheel 301, and achieves a very high motion 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 locking blocks 302 are arranged in an annular array at equal intervals around the axis of the transmission wheel 301. One end of the locking block 302 is rotatably connected to the clutch fixed plate 303, and the other end of the locking block 302 is slidably connected to the main gear 900. The main gear 900 pushes the locking block 302 to engage with the transmission wheel 301 through a track groove or guide surface. The provision of multiple locking blocks 302 significantly improves the stability of the main gear 900 driving the transmission wheel 301 to rotate simultaneously, and significantly reduces vibration and noise during the locking process. The clutch torque plate 304 includes a circular plate 3043, an inner friction plate 3041, and an outer fixed plate 3042.The annular plate 3043 is an annular sheet structure. The inner ring of the annular plate 3043 is fixed with multiple inner friction plates 3041, and the outer ring of the annular plate 3043 is fixed with multiple outer fixed plates 3042. Each inner friction plate 3041 is inclined toward one side of the outer fixed plate 3042, thereby producing an interference fit. The annular plate 3043, the inner friction plate 3041 and the outer fixed plate 3042 in this embodiment are an integrally formed structure, and their material is made of wear-resistant material, such as wear-resistant plastic or wear-resistant metal; each inner friction plate 3041 is provided with a friction protrusion 3044, and the friction protrusion 3044 is arranged on the side of the inner friction plate 3041 close to the outer fixed plate 3042. The clutch torque plate 304 contacts the clutch base 304 through the friction protrusion 3044. 5 or the clutch stator 303 generate friction; the friction protrusion 3044 is an integral structure stamped or cast on the inner friction plate 3041. This integrally formed structure reduces the material manufacturing cost of the friction protrusion 3044 and significantly extends the life of the clutch torque plate 304; the number of inner friction plates 3041 is the same as the number of outer stator plates 3042, and multiple inner friction plates 3041 are arranged in a uniform annular array around the center of the circular ring plate 3043, with each inner friction plate 3041 corresponding to the outer stator plates 3042. For example, there are eight inner friction plates 3041 and eight outer friction plates, and the outer stator plates 3042 are perpendicular to the circular ring plates 3043. The angle between the inner friction plates 3041 and the circular ring plates 3043 is acute.

[0060] In some optional embodiments, the first embodiment of the clutch assembly 300 is a friction plate clutch assembly, wherein a spline groove 3011 is provided on the inner side of the transmission wheel 301, and the transmission wheel 301 is fixed to the spindle assembly 500 through the spline groove 3011. In addition, the transmission wheel 301 and the spindle assembly 500 can also be fixed to the spindle assembly 500 by 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 3031. 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 opened 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 each two adjacent external fixing grooves 3051, and an internal fixing groove is formed between each two adjacent arc-shaped protrusion plates. 3052, the inner friction plate 3041 of the clutch torque plate 304 is correspondingly inserted into the inner fixed groove 3052. In this embodiment, a plurality of wedge-shaped clamping blocks 904 are provided on the main gear 900. The plurality of wedge-shaped clamping blocks 904 jointly limit the clutch fixing plate 303 to one side of the main gear 900. When clamped, the clutch fixing plate 303 can rotate relative to the main gear 900. The working principle of this solution 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, it contacts and engages with the transmission wheel 301, and the clutch fixing plate 303 and the clutch torque plate 304 are 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. This 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, thereby realizing that the main gear 900 drives the clutch fixing plate 303 to rotate continuously.

[0061] 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. 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. 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 above; 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 engages with the transmission wheel 301 under the action of the main gear 900. The clutch fixing plate 303 and the clutch base 305 have an interference fit and friction is generated between the two. The clutch torque plate 304 is fixed on the clutch fixing plate 303, thereby providing friction formed by torque to the clutch fixing plate 303. 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, thereby realizing that the main gear 900 drives the clutch fixing plate 303 to rotate continuously.

[0062] 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 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 engaged 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 engage 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. This friction is not enough to prevent the rotation of the clutch fixing plate 303; when the main gear When the 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 disengaged from the transmission wheel 301 under the action of the track groove on the main gear 900 or the return 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 by the spline groove 3011; when the return 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 generated by the inner ring of the one-way clutch spring 306 of this embodiment, after shrinking, contacts the clutch base 305 or the clutch stator 303, significantly improving the one-way locking performance of the main gear 900 by driving the locking mechanism to lock the transmission wheel 301. This achieves extremely high motion synchronization between the main gear 900 and the clutch stator 303. The spring-type clutch assembly has a simple structure and good stability, significantly improving the clutching effect of the seatbelt retractor.

[0063] 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 protruding end 3061, and the end surface of the clutch fixing plate 303 facing away from the locking mechanism is provided with an annular protrusion, the one-way clutch spring 306 is embedded in the annular protrusion, the inner ring of the annular protrusion is provided with a clutch spring clamping groove 3034, and the clutch spring protruding 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 ring diameter of the one-way clutch spring 306 is smaller than the inner ring diameter of the annular protrusion. The cam 3034 is a substantially parallel, substantially parallel, arrangement of the cam 3036 and the engagement of the cam 3036 with the engagement of the cam 3036. The cam 3036, which is a substantially parallel arrangement of the cam 3036, is a substantially parallel arrangement of the cam 3036. The cam 3036 is a substantially parallel arrangement of the cam 3036 and the engagement of the cam 3036 with the engagement of the cam 3036. 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 achieved. The spring 306 and the clutch base 305 generate a reasonable friction force. In addition, the one-way clutch spring 306 plays a guiding and limiting role. The inner ring of the one-way clutch spring 306 is interference-fitted with the outer circumference 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 protruding end 3061 is the radial direction of the one-way clutch spring 306. By arranging the clutch spring protruding end 3061 to extend along the radial direction of the one-way clutch spring 306, the uniformity of the force applied to the one-way clutch spring 306 is improved, the occurrence of the phenomenon of disengagement between the one-way clutch spring 306 and the clutch spring slot 3034 is avoided, 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 a constant 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 slides Connected to the main gear 900; when the main gear 900 rotates forward, it pushes the multiple locking blocks 302 into meshing contact with the transmission wheel 301; when the main gear 900 rotates backward, the multiple locking blocks 302 disengage from the transmission wheel 301. Specifically, the main gear 900 pushes the locking blocks 302 into meshing contact with the transmission wheel 301 through track grooves or guide surfaces. The provision of multiple locking blocks 302 significantly improves the stability of the main gear 900 driving the transmission wheel 301 to rotate simultaneously, significantly reducing vibration and noise during the locking process.

[0064] 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.

[0065] 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 return spring 307 and a clutch fixing plate 303; a guide chamber is provided on one end face 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 return spring 307, and the other end of the return spring 307 abuts against The clutch fixing plate 303 is provided with a combination of the main gear 900 and the clutch fixing plate 303 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 until it is in contact 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 return 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. There are two locking blocks 302, and the corresponding locking trigger protrusions There are also two gears 907, and 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 ring gear 903. During use, the output shaft of the motor 600 is engaged with the outer ring gear 903 on the main gear 900 through the reduction mechanism assembly 200. Preferably, the return spring 307 is a torsion spring, and the installation of the torsion spring takes up little space. The outer ring gear 903 of the main gear 900 has an involute tooth profile. A spline groove 3011 is provided on the inner side of the transmission wheel 301, and the spline groove 3011 is used to achieve a fixed connection between the transmission wheel 301 and the core shaft assembly 500. The core shaft assembly 500 is used to achieve the retraction of the seat belt; The operating principle of this embodiment is as follows: the main gear 900 rotates relative to the clutch fixing plate 303 under the drive of the motor 600, and the locking block 302 is pushed by the locking trigger protrusion 907 to contact and engage with the transmission wheel 301. The clutch fixing plate 303 and the clutch torque plate or the one-way clutch spring 306 have an interference fit; when the clutch torque plate is used, the clutch torque plate is fixed to 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 in one direction, the inner ring gradually shrinks and generates friction with the clutch base 305.Both of the above methods can provide frictional force generated by torque to the clutch fixing plate 303. This frictional force causes the clutch fixing plate 303 and the main gear 900 to rotate relative to each other. When 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 frictional force provided by the clutch torque plate or the one-way clutch spring 306, thereby achieving continuous rotation of the clutch fixing plate 303 driven by the main gear 900. The beneficial effect of this embodiment is that the locking block 302 provided in this embodiment rotates under the push of the locking trigger protrusion 907, so that the locking block 302 gradually stabilizes and engages with the transmission wheel 301 during use as the main gear 900 rotates relative to the clutch fixing plate 303. 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 achieve the function of one-way rotation locking and reverse reset of the main gear 900.

[0066] 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 that meshes 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 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, involute teeth, or involute teeth. When the pawl 302 is unlocked, the latch 3026 is locked and the latch 3028 is unlocked, so the pawl 302 is unlocked and the latch 3028 is unlocked, so the pawl 302 is unlocked and the latch 3028 is unlocked. The cam 308 is a key component of the cam 308, and the cam 308 is a key component of the cam 308. The cam 308 is a key component of the cam 308, and the cam 308 is a key component of the cam 308. 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 providing the locking fixing plate 308, a better supporting effect is achieved for the locking block 302, thereby avoiding damage to the clutch fixing plate 303 during the movement of the locking block 302, and reducing the difficulty of component maintenance; a force-applying pressure surface 3083 is convexly provided on the outer arc surface of the locking fixing plate 308, and a force-applying guide surface 908 is provided on the inner ring of the main gear 900. The force-applying 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-applying guide surface 908 abuts against the force-applying pressure surface 3083;The pawl 308 is pressed against the pawl 309 to release the pawl 309, and the pawl 309 is pressed against the pawl 309. The pawl 309 is pressed against the pawl 309, and the pawl 309 is pressed against the pawl 309. In the torsion spring fixing groove 3036 of the fixing plate 303, the second limiting pin 3037 is preferably a cylindrical pin. The provision of the second limiting pin 3037 effectively limits the reset spring 307. A torsion spring support protrusion 3038 is provided in the torsion spring fixing groove 3036. The torsion spring support protrusion 3038 is located on the side of the second limiting pin 3037 facing away from the first limiting pin 3035. The middle portion of the first leg 3071 abuts against the torsion spring support protrusion 3038. The provision of the torsion spring support protrusion 3038 provides support for the first leg 3071, improving the uniformity of the force applied to the torsion spring. The torsion spring support protrusion 3038 forms a fulcrum for the first leg 3071, making the force exerted on the reset of the locking block 302 more uniform and stable.

[0067] In some optional embodiments, a locking mechanism of the first scheme further 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 provided 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. 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 circular holes. 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 the impact effect during use is small.

[0068] 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 end face 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, the number of the track grooves 901 and the locking block 302 are the same and are arranged one-to-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 to 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 forward relative to the clutch fixing plate 303, the locking block 302 slides in the track groove 901 until it is in 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 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 ring gear 903 on the main gear 900. Preferably, the outer ring gear 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 achieve a fixed connection between the transmission wheel 301 and the core shaft component 500, and the core shaft component 500 is used to achieve the retraction of the seat belt; the operating principle of this embodiment is that the main gear 900 is driven by the motor 600 to rotate relative to the clutch stator 303, and the locking block 302 is in contact and meshed with the transmission wheel 301 under the action of the track groove 901, and the clutch stator 303 is interference fit with the clutch torque plate 304, and the clutch torque plate 304 is fixed on the clutch base 305, thereby providing the clutch stator 303 with a certain degree of tension. The friction force generated 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, thereby realizing that the main gear 900 drives the clutch fixing plate 303 to rotate continuously; by sliding the locking block 302 in the track groove 901, the clutch assembly 300 is gradually stabilized and engaged 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.

[0069] 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 locking blocks 302 there are, 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 a connecting part 3023, and a 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 that meshes 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 toward the other end of the track groove 901 and is inclined toward the inside of the track groove 901, and 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 operation 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 arc curve has a curvature center located at an eccentric position of the center of the main gear 900, and 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 to be in the shape of an arc curve, the stability of the sliding protrusion 3021 of the locking block 302 in the track groove 901 is enhanced, and the impact generated during the movement is reduced; the tooth profile on the outer peripheral side of the transmission wheel 301 is asymmetric trapezoidal teeth, and the asymmetric trapezoidal teeth on the outer peripheral side of the transmission wheel 301 are inclined toward the side of the locking portion 3024 away from the rotating portion 3022, and the transmission teeth of the locking portion 3024 are asymmetric trapezoidal teeth adapted to the tooth profile 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 extremely 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 provided 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. 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 tangential 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 located on the outer edge of one side of the guide chamber 905 and is further provided with a plurality of wedge-shaped blocks 904. 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 located on the end face of the inner side of the guide chamber 905 and is provided with at least one limiting protrusion 3032. Each limiting protrusion 3032 is provided with a limiting groove 3033 with an open end. The rotating portion 3022 of the locking block 302 and the closed end of the limiting groove 3033 are engaged. The locking portion 3024 of the locking block 302 extends out of the open end of the limiting groove 3033. The limiting groove 3033 is a V-shaped groove with a width at its open end greater than that at its closed end. The provision of the limiting groove 3033 prevents the locking block 302 from rotating excessively, reducing the impact caused by the locking block 302 during use. An annular protrusion 3031 is provided on the end surface of the clutch fixing plate 303 facing away from the main gear 900. The annular protrusion 3031 has a circular cylindrical structure and contacts the clutch torque plate 304, creating a certain amount of friction between the two. The clutch torque plate 304 is fixed to the clutch base 305.

[0070] In the first embodiment of the clutch assembly 300 of the seat belt retractor, a friction plate clutch assembly of the first embodiment can be provided with a locking mechanism of the first embodiment or a locking mechanism of the second embodiment. Similarly, in the second embodiment of the clutch assembly 300 of the above embodiment, a spring clutch assembly of the second embodiment can be provided with a locking mechanism of the first embodiment or a locking mechanism of the second embodiment.

[0071] In some optional embodiments, the seat belt retractor further 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, and the Hall sensor 14 is arranged on the base 2013. 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. 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 The spring 102 is fixed to the spring mounting portion 121, and the spring 102 is partially 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 spring cover 12 is the large head end; the spring mounting portion 121 adopts a cylindrical or truncated cone shape, which can prevent the spring 102 from being obstructed by the side of the spring mounting portion 121 during the compression process, so that the spring 102 02's entire compression and expansion process is smooth; a second groove 20132 is provided on the end surface opposite to the coil spring cover 12 of the base 2013, 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 speed; the seat belt trigger structure 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 12, and extends along the central axis of the coil spring cover 12 in a direction close to the Hall sensor 14; by providing the magnet mounting portion 122, the distance between the magnet 15 and the Hall sensor 14 can be made closer, so that the trigger structure can be more sensitive, wherein the magnet mounting portion 122 is cylindrical, truncated cone or rectangular. 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 made closer;The magnet 15 is embeddedly mounted on the end of the magnet mounting portion 122; by adopting this mounting method, the magnet 15 can be prevented from falling off, and the failure of the trigger structure caused by the falling off of the magnet 15 can be avoided; when the spring 102 is in the ultimate 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 ultimate position of the coil spring 101. Then, the coil spring cover 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 both are arc-shaped grooves;

[0072] 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 core shaft 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 core shaft 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 core shaft 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 core shaft assembly 500 are fixed and locked at the same time, the core shaft assembly 500 can be sheared when the locking force reaches a certain value, so that the core shaft assembly can continue to perform force limiting control to relieve the pressure of the seat belt on the occupant's chest; the number of pins 501 is one or more, and is set on the end face of the core shaft assembly 500; the number of pin holes 104 is the same as the number of pins 501, and the position of the pin holes 104 is opposite to the corresponding pins 501. Among them, the number of pins 501 is related to the force required for shearing. When the force required for shearing is small, the number of pins 501 can be selected to be smaller. For example, when the setting core shaft assembly 500 is locked to 75 Newtons, a pin 501 can be selected. When the setting core shaft 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 core shaft 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, and 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 is adapted to the diameter of the pin 501. Alternatively, the pin 501 is truncated cone-shaped, with its large end in contact with the core shaft assembly 500, and the shape and size of the pin hole 104 are adapted to 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 is adapted to the size of the pin 501. Alternatively, the pin 501 is pyramidal, and the size of the pin hole 104 is adapted to the shape and size of the pin. When making a selection, the pin 501 can also be of other shapes, as long as it is adapted to 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 core shaft assembly 500.When there are multiple pins 501, the multiple pins 501 are evenly distributed on the end face of the core shaft assembly 500 along the center of the end face of the core shaft assembly 500, wherein the number of pins 501 is two, and other numbers of pins can be selected as needed for setting, such as 3 or 4, wherein the distance between the center position of the pin 501 and the center position of the end face of the core shaft assembly 500 is not specifically limited. The material of the pin 501 is metal or plastic. wherein, when selecting the material of the pin 501, it can be the same as the material of the core shaft assembly 500 and obtained by an integral molding process, or it can be made of a different material and fixed to the end face of the core shaft assembly 500 by welding or bonding. The seat belt retractor also includes an outer cover 11 for enclosing the deceleration mechanism assembly 200 and the coil spring cover plate 12.

[0073] 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 the gas generator in time, and the locking mechanism can quickly lock the retractor to buffer the pressure of the seat belt. The locking structure can be locked using the structure described above.

Claims

1. A motor-driven safety retractor, characterized in that: It includes a motor, a reduction mechanism assembly, a main gear, a clutch assembly and a spindle assembly, wherein the output end of the motor is connected to the reduction mechanism assembly, the output end of the reduction mechanism assembly is meshed with the main gear, the main gear is connected to the spindle assembly through the clutch assembly, and the spindle assembly is driven to rotate by the motor; The output end of the motor is provided with a driving gear, and the reduction mechanism assembly adopts a planetary gear structure or an eccentric swing gear structure. The motor is decelerated by the reduction mechanism assembly and the motion is transmitted to the main gear. The main gear is connected to the core shaft assembly through the clutch assembly, so that the core shaft assembly is driven to rotate by the motor; the motor also includes a coil spring assembly, which is arranged on a side of the core shaft assembly close to the clutch assembly; and the motor also includes a control unit, which is arranged inside the motor-driven safety retractor and is used to control the motor and the clutch assembly. The vehicle further comprises a pretensioner assembly, the pretensioner assembly being arranged on the outside of the spindle assembly and pretensioning the spindle assembly in the event of an emergency of the vehicle. The planetary carrier gear structure comprises a planetary carrier gear assembly and a stepped gear, the stepped gear comprising a driving external gear and a primary driven gear, the driving external gear and the primary driven gear being coaxially and integrally arranged. The clutch assembly includes a main gear, a locking mechanism, a transmission wheel, a clutch fixing plate, a clutch torque plate and a clutch base; the locking mechanism is provided between the main gear and the clutch fixing plate, the clutch torque plate is provided between the clutch base and the clutch fixing plate, one end of the clutch torque plate is connected to the clutch fixing plate, and the other end of the clutch torque plate is connected to the clutch base; when the main gear rotates forward relative to the clutch fixing plate, the locking mechanism is pushed to a contact and meshing state with the transmission wheel; when the main gear rotates reversely relative to the clutch fixing plate, the locking mechanism is pushed to a disengagement state with the transmission wheel; the clutch torque plate provides the friction force required for the main gear to rotate relative to the clutch fixing plate by generating sliding friction force through continuous contact, and the planetary carrier gear assembly also includes a planetary carrier gear, which is arranged on the side of the planetary gear inner gear axially away from the base and is meshed with the main gear.

2. The motor-driven safety retractor according to claim 1, characterized in that: The coil spring assembly includes a coil spring cover plate and a coil spring. The coil spring is arranged in the coil spring cover plate and is connected to the shaft end of the core shaft assembly.

3. The motor-driven safety retractor according to claim 1, characterized in that: The planetary carrier gear assembly further includes a common planetary gear meshingly connected with the driving external gear.

4. The motor-driven safety retractor according to claim 1, characterized in that: The eccentric swing gear structure includes a swing gear assembly, an eccentric structure assembly and a secondary transmission gear. The eccentric structure assembly includes an eccentric shaft and a primary transmission gear. The eccentric shaft and the primary transmission gear are integrally arranged. The driving gear is meshed and connected with the primary transmission gear. The eccentric shaft is connected with the swing gear assembly, and the swing gear assembly is connected with the secondary transmission gear.

5. The motor-driven safety retractor according to claim 1, characterized in that: It also includes a mechanical end assembly, which is arranged on a side of the core shaft assembly close to the pretensioner assembly.

6. The motor-driven safety retractor according to claim 5, characterized in that: The mechanical end assembly 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.

Images