A high-torque motor drive structure for seat belts and seat belt retractor

Abstract

The invention discloses a high-torque motor drive structure for a safety belt and a safety belt retractor. The former comprises a motor, a reduction mechanism assembly, a main gear, a clutch assembly and a spindle assembly. The output end of the motor is connected with the reduction mechanism assembly, the output end of the reduction mechanism assembly is meshed with the main gear, the main gear is connected with the spindle assembly through the clutch assembly, and the spindle assembly is driven to rotate by the motor; a driving gear is arranged at the output end of the motor, the reduction mechanism assembly comprises a swing gear assembly, an eccentric structure assembly and a secondary transmission gear, the eccentric structure assembly comprises 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 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; when the driving gear rotates, the main gear is connected with the spindle assembly through the clutch assembly, so that the spindle assembly is driven to rotate by the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of seat belts, and in particular to a high-torque motor drive structure for seat belts and a seat belt retractor. Background Art

[0002] Seat belts are essential safety devices in cars. They can fasten occupants firmly to their seats when the vehicle collides or emergency brakes. They protect the safety of people when the vehicle has an accident and are an important part of the passive safety system. In the prior art, pyrotechnic pretensioners are usually used for ignition and detonation. Since pyrotechnic pretensioners use an detonating gas generator to drive the webbing to rewind, they cannot be reused. Once detonated, they must be replaced as a whole, so the cost is high. They are disposable and irreversible, which causes limitations in their use. Summary of the invention

[0003] To this end, the present invention provides a high-torque motor drive structure for a seat belt and a seat belt retractor to solve the problems in the prior art that the pyrotechnic pretensioner is non-reusable, irreversible and has high cost.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] According to the present invention, a high-torque motor drive structure for a seat belt is provided, comprising a motor, a speed reduction mechanism assembly, a main gear, a clutch assembly and a spindle assembly, wherein the output end of the motor is connected to the speed reduction mechanism assembly, the output end of the speed reduction mechanism assembly is meshed and connected to 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;

[0006] Wherein, the output end of the motor is provided with a driving gear, the speed reduction mechanism assembly 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 meshedly 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;

[0007] When the driving gear rotates, the main gear is rotated through the primary transmission gear, the swing gear assembly and the secondary transmission gear. The main gear is connected to the spindle assembly through the clutch assembly, so that the spindle assembly is driven to rotate by the motor.

[0008] Furthermore, a plurality of through holes are provided on the end surface of the secondary transmission gear, and the through holes are evenly distributed around the axis of the secondary transmission gear.

[0009] Furthermore, the swing gear assembly includes a swing gear and a transmission member, wherein the transmission member is arranged on a surface of the swing gear facing the secondary transmission gear, and the transmission member is arranged opposite to the through hole.

[0010] Furthermore, the transmission member is cylindrical, and the diameter of the transmission member is smaller than the diameter of the through hole.

[0011] Furthermore, the number of the through holes is 6, and the number of the through holes is the same as the number of the transmission parts.

[0012] Furthermore, the swing amplitude of the swing gear assembly is not greater than the eccentricity of the eccentric structure assembly.

[0013] Furthermore, the high-torque motor drive structure for the seat belt further includes a reduction internal gear, which is arranged on the outer side of the swing gear in the circumferential direction and meshedly connected with the swing gear.

[0014] Furthermore, the number of teeth of the reduction internal gear is greater than the number of teeth of the swing gear.

[0015] Furthermore, the number of teeth of the reduction internal gear is 36, and the number of teeth of the swing gear is 32 to 35.

[0016] The present invention also provides a seat belt retractor, wherein the seat belt retractor has the high-torque motor driving structure for the seat belt as described above.

[0017] The present invention has the following advantages:

[0018] According to the present invention, when the driving gear rotates, the main gear is rotated through the primary transmission gear, the swing gear assembly and the secondary transmission 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 the seat belt is pre-tightened, the main gear can be reused, and the forward and reverse rotation of the core shaft assembly can be achieved through the forward and reverse rotation of the motor. The main gear has the characteristics of simple structure and high transmission torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0021] Figure 1 is a schematic diagram of the overall structure of a motor-driven seat belt retractor according to an exemplary embodiment;

[0022] Figure 2 is a transmission structure schematic diagram of a motor drive structure for a seat belt according to an exemplary embodiment;

[0023] Figure 3 1 is a transmission structure schematic diagram of a motor drive structure for a safety belt according to an exemplary embodiment (without the planetary carrier gear);

[0024] Figure 4 Schematic diagram of a transmission structure of a motor drive structure for a safety belt according to an exemplary embodiment (with a base);

[0025] Figure 5 is a schematic structural diagram of a stepped gear according to an exemplary embodiment;

[0026] Figure 6 is a schematic structural diagram of a planetary carrier gear according to an exemplary embodiment;

[0027] Figure 7 is a transmission structure schematic diagram of a high-torque motor drive structure for a seat belt according to an exemplary embodiment;

[0028] Figure 8 is a structural schematic diagram of a high-torque motor driving structure for a seat belt according to an exemplary embodiment;

[0029] Fig. 9 is a structural schematic diagram of a high-torque motor driving structure for a seat belt from another perspective according to an exemplary embodiment;

[0030] Fig.10 1 is a schematic structural diagram of a high-torque motor drive structure for a seat belt according to an exemplary embodiment (without the secondary transmission gear);

[0031] Fig.11 is a schematic structural diagram of an eccentric structural assembly according to an exemplary embodiment;

[0032] Fig.12 is a schematic diagram of an exploded structure of a seat belt retractor according to an exemplary embodiment;

[0033] Fig.13 is a structural schematic diagram of a seat belt retractor according to an exemplary embodiment (with the outer cover removed);

[0034] Fig.14 is a schematic structural diagram of a coil spring cover according to an exemplary embodiment;

[0035] Fig.15 is a structural schematic diagram showing a trigger structure for a safety belt in a trigger state according to an exemplary embodiment;

[0036] Fig.16 is a structural schematic diagram showing a safety belt trigger structure in a non-triggering state according to an exemplary embodiment;

[0037] Fig.17 is a schematic structural diagram of a shearing assembly for a safety belt according to an exemplary embodiment;

[0038] Fig.18 It is a schematic structural diagram of a pin hole according to an exemplary embodiment. DETAILED DESCRIPTION

[0039] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] According to an embodiment of the present invention, a motor-driven safety retractor is provided. Figures 1 to 18 As shown, it includes a motor 600, a speed 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 speed reduction mechanism assembly 200, the output end of the speed reduction mechanism assembly 200 is meshedly connected to 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;

[0041] Among them, the output end of the motor 600 is provided with a driving gear 601, and the reduction mechanism assembly 200 adopts a planetary gear structure or an eccentric swing gear structure. The motor 600 is decelerated by the reduction mechanism assembly 200 and the motion is transmitted to the main gear 900. The main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600.

[0042] The motor-driven safety retractor provided by the present invention has a motor 600 that is decelerated by the deceleration mechanism assembly 200 and transmits the motion to the main gear 900. The main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600. The motor 600 can be reused when pre-tightening the seat belt, and the spindle assembly 500 can be rotated forward and reversed by the motor 600.

[0043] In some optional embodiments, the motor-driven safety retractor further includes a coil spring assembly 100, which is disposed on a side of the spindle assembly 500 close to the clutch assembly 300. The coil spring assembly 100 includes a coil spring cover plate 12 and a coil spring 101, which is disposed in the coil spring cover plate 12 and connected to the shaft end of the spindle assembly 500. By providing the coil spring 101, the safety belt wound on the spindle assembly 500 can be retracted to ensure that the safety belt is always close to the human body.

[0044] In some optional embodiments, the motor-driven safety retractor further includes a control unit 400, which is disposed inside the motor-driven safety retractor and is used to control the motor 600 and the clutch assembly 300, such as stopping the motor 600 from rotating.

[0045] In some optional embodiments, the motor-driven safety retractor further includes a pretensioner assembly 700, which is disposed on the outside of the spindle assembly 500. When an emergency occurs in the vehicle, the spindle assembly 500 is pretensioned, and the pretensioning can be achieved by using a motor 600.

[0046] The driving structure in the embodiment of the present invention can adopt a motor driving structure for a seat belt, including 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 and connected 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 includes a planetary carrier gear assembly 201 and a stepped gear 202, the stepped gear 202 includes a driving external gear 2021 and a primary driven gear 2022, the driving external gear 2021 and the primary driven gear 2022 are coaxially arranged as a whole; the driving gear 601 and the primary driven gear 2022 are coaxially arranged as a whole; The driving outer gear 2021 is meshingly connected to the planetary carrier gear assembly 201; when the driving gear 601 rotates, the main gear 900 rotates through the primary driven gear 2022, the driving outer gear 2021 and the planetary carrier gear assembly 201, and the main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600.

[0047] The present invention adopts an electric motor 600, through the driving gear 601 at the output end of the electric 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, 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. When the seat belt is pre-tightened, it can be reused, and the spindle assembly 500 can be rotated forward and reversely by the electric motor 600.

[0048] In some optional embodiments, the planetary carrier gear assembly 201 further includes a common planetary gear 2011, which is meshed with the active external gear 2021, wherein the common planetary gear 2011 is arranged on the circumferential outer side of the active external gear 2021, and the rotation of the active external gear 2021 drives the common planetary gear 2011 to rotate. The number of the common planetary gears 2011 is one or more, and when the number of the common planetary gears 2011 is more than one, such as the number of the common planetary gears 2011 can be 3-5, which are evenly distributed along the circumferential direction of the active external gear 2021, and the number of the common planetary gears 2011 is three. The planetary carrier gear assembly 201 further includes a planetary gear internal gear 2012, which is fixed on the base 2013 of the speed reduction mechanism assembly 200, and is connected by a spline 2015, so that the planetary gear internal gear 2012 is fixed when the common planetary gear 2011 rotates. The planetary carrier gear assembly 201 further includes a planetary carrier gear 2014, which is arranged on the axial side of the planetary gear inner gear 2012 away from the base 2013 and can be meshed with the main gear 900. A cylinder 2016 is arranged on the surface of the planetary carrier gear 2014 facing the common planetary gear 2011, and the cylinder 2016 is arranged opposite to the axis of the common planetary gear 2011. The cylinder 2016 is inserted at the axis of the common planetary gear 2011. When the common planetary gear 2011 rotates, the cylinder 2016 rotates synchronously with the common planetary gear 2011, and the rotation of the cylinder 2016 drives the planetary carrier gear 2014 to rotate, wherein the number of the cylinder 2016 is the same as the number of the common planetary gear 2011, which can be three to five, and the specific position of the cylinder 2016 corresponds to the center of the common planetary gear 2011. The motor 600 is a brushed DC motor with a voltage of 12V / 24V / 36V / 48V and a maximum current of 40A. It has the characteristics of fast starting, timely braking, smooth speed regulation over a wide range, and a relatively simple control circuit.

[0049] The driving structure in the embodiment of the present invention can also be a high-torque motor driving structure for a seat belt, comprising a motor 600, a speed 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 speed reduction mechanism assembly 200, the output end of the speed reduction mechanism assembly 200 is meshedly connected to 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;

[0050] The output end of the motor 600 is provided with a driving gear 601, the speed reduction mechanism assembly 200 includes a swing gear assembly 203, an eccentric structure assembly 204 and a secondary transmission gear 205, the eccentric structure assembly 204 includes an eccentric shaft 2041 and a primary transmission gear 2042, and the eccentric shaft 2041 and the primary transmission gear 2042 are integrally arranged; the driving gear 601 is meshedly 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;

[0051] When the driving gear 601 rotates, the main gear 900 rotates through the primary transmission gear 2042, the swing gear assembly 203 and the secondary transmission gear 205. The main gear 900 is connected to the spindle assembly 500 through the clutch assembly 300, so that the spindle assembly 500 is driven to rotate by the motor 600.

[0052] In the present invention, when the driving gear 601 rotates, the main gear 900 is rotated through the primary transmission gear 2042, the swing gear assembly 203 and the secondary transmission gear 205. 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. It has the characteristics of simple structure and high transmission torque.

[0053] In some optional embodiments, 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 meshedly connected with the primary transmission gear 2042, the eccentric shaft 2041 is connected with the swing gear assembly 203, and the swing gear assembly 203 is connected with the secondary transmission gear 205. A plurality of through holes 2051 are arranged 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, the transmission member 2032 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 holes 2051. By providing 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. Among them, the transmission member 2032 adopts a cylindrical shape, which can make the entire transmission process smooth, and can increase the contact between the transmission member 2032 and the through hole 2051 compared with the use of a truncated cone or a prism shape. The number of the through holes 2051 is 6, and the number of the through holes 2051 is the same as the number of the transmission members 2032. Of course, the number of the transmission members 2032 can also be less than the number of the through holes 2051, and the transmission of rotation can be realized. In the process of transmission, the transmission member 2032 is inserted into the through hole 2051, and in the process of the swing gear 2031 rotating, 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 outer side of the swing gear 2031 in the circumferential direction and meshed with the swing gear 2031. The reduction internal gear 206 is fixed to the base of the reduction mechanism assembly 200 using a spline structure. By setting the reduction internal gear 206 and cooperating with the swing gear 2031, the reduction of the reduction mechanism assembly 200 is achieved. The number of teeth of the reduction internal gear 206 is greater than the number of teeth of the swing gear 2031. Among them, the number of teeth of the reduction internal gear 206 is 36, and the number of teeth of the swing gear 2031 is 32 to 35. By setting a difference in the number of teeth between the reduction internal gear 206 and the swing gear 2031, the reduction of the 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. The present invention adopts an eccentric structure assembly to realize the transmission of motion, and can achieve multi-stage deceleration during the transmission process.

[0054] According to an embodiment of the present invention, a trigger structure for a seat belt is also provided, including a magnet 15 and a Hall sensor 14, wherein 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 a base 2013, and a first groove 20131 is provided on the base 2013. Under the action of the coil spring 101, the magnet 15 moves along the first groove 20131, and when the magnet 15 is opposite to the Hall sensor 14, the magnet 15 triggers the Hall sensor 14.

[0055] According to the trigger structure of the embodiment of the present invention, when the magnet 15 moves along the first groove 20131 and reaches the limit position of the coil spring 101, 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 phenomenon of exceeding the limit position of the coil spring 101 and damaging the coil spring 101.

[0056] In some optional embodiments, the coil spring cover plate 12 is further provided with a spring mounting portion 121, and the spring mounting portion 121 extends tangentially along the circumference of the coil spring cover plate 12. There is one spring mounting portion 121, and one end of the spring 102 is fixed on the spring mounting portion 121, wherein a portion of the spring 102 is sleeved on the outer surface of the spring mounting portion 121. The spring mounting portion 121 is cylindrical or truncated cone-shaped. When the spring mounting portion 121 is truncated cone-shaped, the end close to the coil spring cover plate 12 is the large end. The spring mounting portion 121 is cylindrical or truncated cone-shaped, so that the spring 102 will not be hindered by the side of the spring mounting portion 121 during the compression process, so that the entire compression and expansion process of the spring 102 is smooth. 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 portion 121 can move in the second groove 20132 to compress or release the spring 102. 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 plate 13, which is arranged between the coil spring cover plate 12 and the base 2013. The positioning cover plate 13 is mainly arranged to facilitate the installation of the coil spring cover plate 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 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 size of the rotation speed. The trigger structure for the seat belt also includes a magnet mounting portion 122, one end of which is fixed to the edge of the coil spring cover plate 12, and extends along the central axis of the coil spring cover plate 12 in the direction close to the Hall sensor 14. By 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 at the end of the magnet mounting portion 122. By adopting this installation method, it is possible to avoid the magnet 15 from falling off, and avoid the phenomenon of failure of the trigger structure due to the falling off of the magnet 15.When the spring 102 is in the limit state of compression, the magnet 15 is opposite to the Hall sensor 14, and the Hall sensor 14 is triggered. The control unit 400 stops the motor 600 according to the signal of the Hall sensor 14 to avoid exceeding the limit position of the coil spring 101. Then, the coil spring cover 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-triggered position. The first groove 20131 and the second groove 20132 are respectively arranged on both sides of the circular ring in the base 2013, and their shapes are both arc-shaped grooves.

[0057] According to an embodiment of the present invention, a shearing assembly for a seat belt is further provided, comprising 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.

[0058] The present invention provides a pin 501 and a pin hole 104. When the motor structure is used to drive the seat belt retractor and both ends of the spindle assembly 500 are fixed and locked at the same time, the spindle assembly 500 can be sheared when the locking force reaches a certain value, so that the spindle assembly can continue to perform force limiting control to relieve the pressure of the seat belt on the occupant's chest.

[0059] In some optional embodiments, the number of the pins 501 is one or more, and they are arranged on the end face of the spindle assembly 500; the number of the pin holes 104 is the same as the number of the pins 501, and the positions of the pin holes 104 are opposite to the corresponding pins 501. The number of the pins 501 is related to the force required for shearing. When the force required for shearing is small, the number of the pins 501 can be selected to be less. For example, when the spindle assembly 500 is set to be locked to 75 Newtons, one pin 501 can be selected. When the spindle assembly 500 is set to be locked to 150 Newtons, the pins 501 are sheared, and two pins 501 can be selected, wherein the two pins 501 and the center of the end face of the spindle assembly 500 are on the same straight line. A protrusion 103 is formed on the axial inner surface of the coil spring assembly 100, and a pin hole 104 is arranged on the protrusion 103 of the coil spring assembly 100. The cross section of the protrusion 103 is in the shape of an arc, and the pin hole 104 is arranged along the axial direction of the protrusion 103. The pin 501 is cylindrical, and the pin hole 104 is circular, and the diameter of the pin hole 104 is adapted to the diameter of the pin 501, or the pin 501 is in the shape of a truncated cone, and its large end contacts 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, or the pin 501 is in the shape of a rectangular body, and 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, or the pin 501 is in the shape of a pyramid, 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 matches 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 the pin 501 is one, its center position is set at a non-center position of the end face of the spindle assembly 500. When the number of the pins 501 is multiple, the multiple pins 501 are evenly distributed on the end face of the spindle assembly 500 along the center of the end face of the spindle assembly 500, wherein the number of the 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 spindle assembly 500 is not specifically limited. The material of the pin 501 is metal or plastic. The material of the pin 501 can be the same as that of the spindle assembly 500 and can be obtained by an integrated molding process, or it can be made of a different material and fixed to the end surface of the spindle assembly 500 by welding or bonding. The seat belt retractor also includes an outer cover 11 for enclosing the speed reduction mechanism assembly 200 and the coil spring cover plate 12.

[0060] In some optional embodiments, the motor-driven safety retractor further includes a mechanical end assembly 800, and the mechanical end assembly 800 is disposed on a side of the spindle 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 in the vehicle and trigger a gas generating agent in time, and the locking mechanism can quickly lock the retractor, which can buffer the pressure of the seat belt.

[0061] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A high torque motor drive structure for a seat belt, characterized in that: It includes an electric motor, a reduction mechanism assembly, a main gear, a clutch assembly and a spindle assembly, wherein the output end of the electric motor is connected to the reduction mechanism assembly, the output end of the reduction mechanism assembly is meshed and connected to 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 electric motor; Wherein, the output end of the motor is provided with a driving gear, the speed reduction mechanism assembly 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 meshedly 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; When the driving gear rotates, the main gear rotates through the primary transmission gear, the swing gear assembly and the secondary transmission gear, and the main gear is connected to the spindle assembly through the clutch assembly, so that the spindle assembly is driven to rotate by the motor; A plurality of through holes are arranged on the end surface of the secondary transmission gear, and the through holes are evenly distributed around the axis of the secondary transmission gear; The swing gear assembly includes a swing gear and a transmission member, wherein the transmission member is arranged on the surface of the swing gear facing the secondary transmission gear, and the transmission member is arranged opposite to the through hole; The transmission member is cylindrical, and the diameter of the transmission member is smaller than the diameter of the through hole; The swing amplitude of the swing gear assembly is not greater than the eccentricity of the eccentric structure assembly.

2. A high torque motor drive structure for a seat belt according to claim 1, characterized in that: The number of the through holes is 6, and the number of the through holes is the same as the number of the transmission parts.

3. A high torque motor drive structure for a seat belt according to claim 1, characterized in that: It also includes a reduction internal gear, which is arranged on the outer side of the circumference of the swing gear and is meshed and connected with the swing gear.

4. A high torque motor drive structure for a seat belt according to claim 3, characterized in that: The number of teeth of the reduction internal gear is greater than the number of teeth of the swing gear.

5. A high torque motor drive structure for a seat belt according to claim 4, characterized in that: The number of teeth of the reduction internal gear is 36, and the number of teeth of the swing gear is 32 to 35.

6. A seat belt retractor, characterized in that: The seat belt retractor comprises a high-torque motor drive structure for a seat belt according to any one of claims 1 to 5.

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