CN111731223B - Safety belt coiling mechanism - Google Patents

Abstract

The application discloses a safety belt winding device which comprises a metal framework, a mandrel and a spiral spring; the mandrel is provided with a first gear piece at the locking end of the mandrel, and the first gear piece is provided with a first locking tooth surface; the metal framework is provided with a second gear piece meshed with the first gear piece; the safety belt winding device is also provided with a locking assembly, the locking assembly comprises a locking bracket, a locking plate and a driving mechanism for driving the locking plate to slide, and the locking plate is provided with a second locking tooth surface matched with the first locking tooth surface; the safety belt winding device is also provided with a detection device for detecting the angular speed of the second gear piece; when the angular speed of the second gear piece is larger than a preset angular speed reference value, the driving mechanism drives the locking plate to slide so as to lock the first gear piece and the spindle. The locking reliability of this application is comparatively ideal.

Description

Safety belt coiling mechanism

Technical Field

The application relates to the field of auto-parts, especially, relate to a safety belt coiling mechanism.

Background

The automobile safety belt is a device used for ensuring that passengers and drivers are prevented from being injured by the safety airbag when the automobile body is violently impacted, and plays a role in restraining displacement and buffering. When the safety belt retractor is used, the safety belt is pulled out of the safety belt retractor, penetrates through a safety belt guide plate (or a safety belt outlet), and is inserted into a buckle on the seat or beside the seat through a plug-in sheet on the safety belt, so that a passenger is restrained on the automobile seat. When the vehicle runs in an emergency, the safety belt winding device can be locked to prevent the safety belt from being pulled out, and the safety of personnel in the vehicle is guaranteed. Therefore, it is necessary to develop a safety belt tightening device with reliable locking.

Disclosure of Invention

In order to improve safety belt tightening means's locking reliability, this application provides a safety belt coiling mechanism.

The application provides a safety belt coiling mechanism adopts following technical scheme:

a safety belt winding device comprises a metal framework, a mandrel and a spring, wherein the mandrel is rotatably installed on the metal framework and used for winding a safety belt, the spring enables the mandrel to have a tendency of rotating towards the tightening direction of the safety belt all the time, the metal framework comprises a locking side plate and a resetting side plate, and the safety belt winding device is characterized in that the mandrel is provided with a locking end penetrating through the locking side plate, a first gear piece is installed at the locking end, and a first locking tooth surface is arranged on the side surface of the first gear piece far away from the metal framework; the metal framework is provided with a second gear piece in transmission connection with the first gear piece, and the number of teeth of the second gear piece is smaller than that of the first gear piece;

the safety belt winding device further comprises a detection device, wherein the detection device comprises an angular velocity sensor and a controller, the angular velocity sensor is used for detecting the angular velocity of the second gear piece and outputting an angular velocity detection value, an angular velocity reference value is preset, and the angular velocity detection value is compared with the angular velocity reference value;

the safety belt winding device further comprises a locking assembly, wherein the locking assembly comprises a locking bracket mounted on the metal framework, a locking plate mounted on the locking bracket in a sliding mode along the axial direction of the mandrel, and a driving mechanism which is controlled by the controller and drives the locking plate to slide; the locking plate is opposite to the first gear piece and is provided with a second locking tooth surface matched with the first locking tooth surface;

the locking plate is provided with a first station and a second station after being driven by the driving mechanism; when the locking plate is located at the first station, a gap exists between the locking plate and the first gear piece; when the locking plate is located at the second station, a second locking tooth surface of the locking plate is locked with a first locking tooth surface of the first gear piece;

when the angular velocity detection value is larger than the angular velocity reference value, the controller controls the driving mechanism to move the locking plate from the first station to the second station.

By adopting the technical scheme, when an emergency occurs in the driving process, due to the existence of inertia, a person bound by the safety belt inclines forwards, so that the safety belt is pulled out of the safety belt winding device, the spindle is driven to rotate, the first gear piece and the second gear piece also start to rotate, the detection device for detecting the angular velocity of the second gear piece detects that the angular velocity detection value is larger than the angular velocity reference value, the controller controls the driving mechanism to move the locking plate from the first station to the second station, so that the locking plate and the first gear piece are locked through the first locking tooth surface and the second locking tooth surface, the spindle cannot continue to rotate towards the safety belt pulling direction, and the possibility that the safety belt is continuously pulled out of the safety belt winding device is reduced. In the process of locking the safety belt winding device, the safety belt winding device drives the locking plate to slide along the axial direction of the mandrel only by controlling the driving mechanism, and compared with a complex mechanical transmission structure in the safety belt winding device in the related art, the safety belt winding device is simple in structure and relatively ideal in locking reliability.

Preferably, a time node at which the detected angular velocity value is greater than the reference angular velocity value is defined as a reference time node, and the controller controls the driving mechanism to reset the lock plate from the second station to the first station after a preset time period elapses with the reference time node as a start time node.

Through adopting above-mentioned technical scheme, after the preset time cycle after taking place emergency for the lockplate resets to first station from the second station, and the lockplate unlocks with first gear spare promptly, makes things convenient for personnel in the car or rescue personnel to untie the safety belt.

Preferably, the first gear piece is provided with a locking convex part at one side far away from the metal framework, the first locking tooth surface is arranged on the locking convex part, and locking convex teeth are uniformly distributed on the side wall of the locking convex part in the circumferential direction; one side of the locking convex tooth facing the locking plate is a guide arc surface; the locking plate is provided with a locking groove for inserting the locking convex part, the second locking tooth surface is arranged on the bottom surface of the locking groove, the locking plate is provided with a locking tooth groove for embedding the locking convex tooth on the inner side wall of the locking groove, and the locking tooth groove is provided with a third blocking surface and a third inclined surface; when the locking plate is located at the second station, the locking convex teeth abut against the third blocking surface.

Through adopting above-mentioned technical scheme for the locking effect of lockplate and first gear spare is more ideal, has improved the reliability of safety belt coiling mechanism after the locking. The third blocking surface and the third inclined surface in the locking tooth groove are set to facilitate the insertion of the locking convex tooth into the locking tooth groove, and the locking convex tooth is matched with the third blocking surface in the guiding of the third inclined surface.

Preferably, the driving mechanism comprises a driving lead screw, a first lead screw nut and a lead screw motor, the driving lead screw is rotatably mounted on the locking bracket, and the axis of the driving lead screw is overlapped with the axis of the mandrel; the first lead screw nut is mounted on the locking plate and matched with the driving lead screw; the lead screw motor is controlled by the controller and drives the driving lead screw to rotate.

Through adopting above-mentioned technical scheme, actuating mechanism adopts the combination of drive lead screw, first screw nut and screw motor, simple structure for the precision when lockplate slides along the length of dabber is higher, thereby has improved the reliability of above-mentioned safety belt coiling mechanism.

Preferably, the mandrel is provided with a reset end penetrating through the reset side plate, and a third gear piece is mounted at the reset end;

the driving screw axially penetrates through the mandrel, and a driving gear is arranged at the end part extending out of the reset end;

the reset side plate is also provided with a transmission mechanism on the outer side wall thereof, and the transmission mechanism comprises a transmission shaft, a first gear which is rotatably arranged on the transmission shaft and is meshed with the third gear piece, a second gear which is rotatably arranged on the transmission shaft and is meshed with the driving gear, and a pressure spring which is arranged between the first gear and the second gear; the first gear is provided with a first convex part on the side surface facing the second gear, and the first convex part is provided with a first transmission tooth surface; the second gear is provided with a second convex part opposite to the first convex part, and the second convex part is provided with a second transmission tooth surface; two ends of the pressure spring are respectively fixed on the first convex part and the second convex part;

the safety belt winding device is further provided with a trigger mechanism, and the trigger mechanism comprises a trigger support arranged on a reset side plate, a trigger plate arranged on the trigger support in a sliding manner along the axial direction of the mandrel, a second lead screw nut arranged on the trigger plate and matched with the driving lead screw, and an elastic trigger piece arranged on the trigger plate and right opposite to the second gear;

the trigger plate is driven by the driving mechanism and then provided with a fourth station, a fifth station and a sixth station; when the trigger plate is positioned at a fourth station, the elastic trigger part is abutted with the second gear, and the second gear is not meshed with the first gear; when the trigger plate is located at the fifth station, the locking plate is located at the second station; when the trigger plate moves from the fourth station to the sixth station, the elastic trigger piece extrudes the second gear, the second transmission tooth surface is meshed with the first transmission tooth surface, and the lead screw motor drives the mandrel to rotate along the belt releasing direction;

and after the reference time node is used as an initial time node and the preset time period passes, the controller controls the driving mechanism to sequentially move the trigger plate from the fifth station to the fourth station and the sixth station.

By adopting the technical scheme, after the reference time node is taken as the starting time node and the preset time period passes, the trigger plate sequentially moves to the fourth station and the sixth station from the fifth station, so that the elastic trigger part is used for meshing the second transmission tooth surface of the second gear with the first transmission tooth surface of the first gear, the torque of the driving gear is transmitted to the mandrel sequentially through the second gear, the first gear and the third gear, the mandrel rotates along the direction of the safety belt coming off, and the rotating number of the mandrel is related to the length from the sixth station to the fourth station. According to the technical scheme, after an emergency situation occurs in the driving process, the safety belt can be loosened by a length from the safety belt winding device, and convenience is brought to people in a vehicle or rescue workers to unwind the safety belt.

Preferably, the elastic trigger comprises a trigger bottom cylinder fixed on the trigger plate, a trigger slide rod slidably mounted in the trigger bottom cylinder, and a trigger spring mounted in the trigger bottom cylinder and abutted against the trigger slide rod; the end part of the trigger slide bar is provided with a trigger hole for inserting the transmission shaft.

Through adopting above-mentioned technical scheme, the structure of above-mentioned elasticity trigger is injectd and is made the trigger plate can not take place to interfere with the second gear at the removal in-process for the trigger plate can be smoothly removed to the sixth station from the fourth station on.

Preferably, at least two locking chutes are formed in the circumferential direction of the locking plate, and the locking bracket is provided with a locking slide rail matched with the locking chutes; at least two trigger chutes are formed in the circumferential direction of the trigger plate, and the trigger support is provided with a trigger slide rail matched with the trigger chutes.

Through adopting above-mentioned technical scheme for the sliding of lockplate and trigger plate is more stable, helps improving safety belt coiling mechanism's locking reliability.

Preferably, the reset shell is installed on the inner side of the reset side plate, the clockwork spring is installed in the reset shell, one end of the clockwork spring is fixed to the mandrel, and the other end of the clockwork spring is fixed to the reset shell.

Through adopting above-mentioned technical scheme, will reset casing and clockwork spring and install the inboard at the curb plate that resets for reset casing and clockwork spring can not take place to interfere with third gear spare, drive gear, trigger plate and drive mechanism, help improving safety belt coiling mechanism's compact structure degree.

Preferably, the metal framework is provided with a connecting side plate for connecting the locking side plate and the resetting side plate; the second gear member extends to an outer side of the lock side plate, and the angular velocity sensor is mounted to the connection side plate.

Through adopting above-mentioned technical scheme, set up angular velocity sensor on connecting the curb plate, improved safety belt coiling mechanism's compact structure degree.

In summary, the present application includes at least one of the following beneficial technical effects:

1. a safety belt winding device detects the angular speed of a second gear piece through a detection device and compares the angular speed with a preset angular speed reference value, if the angular speed detection value is larger than the angular speed reference value, a driving mechanism is driven, so that a first locking tooth surface of a first gear piece is matched with a second locking tooth surface of a locking plate, a core shaft is locked, a safety belt wound on the core shaft cannot be pulled out, and the safety belt winding device is simple in structure and relatively ideal in locking reliability;

2. by defining a reference time node and presetting a time period, the locking plate is reset to the first station from the second station after the preset time period after an emergency occurs, namely the locking plate and the first gear piece are unlocked, and a person in the vehicle or a rescuer can conveniently unlock a safety belt;

3. through setting up third gear spare, drive gear, drive mechanism and trigger mechanism for meet emergency at the driving in-process after, can loosen out a segment length from the safety belt coiling mechanism, help making things convenient for personnel in the car or rescue personnel to untie the safety belt.

Drawings

Fig. 1 is a schematic structural diagram of the present application.

Figure 2 is a schematic view of the mandrel at the locking end.

Fig. 3 is a schematic view of the structure of the mandrel at the reset end.

Fig. 4 is a schematic structural view of the locking assembly.

Fig. 5 is a schematic view of the locking plate.

Fig. 6 is a schematic view of the cooperation of the third gear member, the drive gear and the transmission mechanism.

Fig. 7 is an exploded schematic view of the transmission mechanism.

Fig. 8 is a schematic structural diagram of the trigger assembly.

Fig. 9 is a schematic cross-sectional view of a resilient trigger.

FIG. 10 is a schematic view of the engagement of the arbour, clockwork spring and reset housing.

In the figure: 1. a metal skeleton; 11. locking the side plates; 111. a second gear member; 12. resetting the side plate; 13. connecting the side plates; 2. a mandrel; 21. a locking end; 22. a reset terminal; 23. a first gear member; 231. a locking projection; 232. a first locking tooth surface; 233. locking the convex teeth; 2331. a guiding cambered surface; 24. a third gear member; 31. resetting the shell; 32. a clockwork spring; 41. a locking bracket; 411. a first side plate; 412. a second side plate; 413. a third side plate; 414. locking the slide rail; 42. a locking plate; 421. a locking groove; 422. a second locking tooth surface; 423. locking the tooth grooves; 4231. a vertical baffle surface; 4232. an inclined guide surface; 424. locking the chute; 51. driving a lead screw; 52. a first lead screw nut; 53. a lead screw motor; 54. a drive gear; 61. a drive shaft; 611. a limiting ring; 612. a limit nut; 62. a first gear; 621. a first convex portion; 622. a first drive flank; 63. a second gear; 631. a second convex portion; 632. a second drive flank; 64. a pressure spring; 71. triggering the bracket; 711. a fourth side plate; 712. a fifth side plate; 713. a sixth side plate; 714. triggering the sliding rail; 72. a trigger plate; 721. triggering the chute; 73. a second lead screw nut; 74. an elastic trigger; 741. triggering the bottom cylinder; 742. triggering the sliding rod; 7421. a trigger hole; 743. a trigger spring; 8. an angular velocity sensor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses safety belt coiling mechanism.

Referring to fig. 1, a safety belt winding device includes a metal frame 1, and a mandrel 2 rotatably mounted on the metal frame 1 and used for winding a safety belt.

The metal framework 1 is integrally C-shaped and comprises a locking side plate 11, a resetting side plate 12 and a connecting side plate 13 for connecting the locking side plate 11 and the resetting side plate 12.

Referring to fig. 2 and 3, the stem 2 is made of metal and has a locking end 21 rotatably penetrating the locking side plate 11 and a reset end 22 rotatably penetrating the reset side plate 12. The spindle 2 is provided with a first gear 23 at the locking end 21 and a third gear 24 at the resetting end 22, and both the first gear 23 and the third gear 24 can rotate synchronously with the spindle 2.

Referring to fig. 2, the metal frame 1 is rotatably mounted with a second gear member 111 engaged with the first gear member 23 at an outer side of the locking side plate 11. The number of teeth of the second gear member 111 is smaller than that of the first gear member 23, and the second gear member 111 partially protrudes out of the lock side plate 11 of the metal frame 1. In the present embodiment, the number of teeth of the second gear member 111 is 1/5 of the number of teeth of the first gear member 23, i.e. the first gear member 23 rotates one turn and the second gear member 111 rotates five turns.

Referring to fig. 1 and 4, the belt retractor further includes a locking assembly including a locking bracket 41 mounted on the locking side plate 11, a locking plate 42 slidably mounted on the locking bracket 41 in the axial direction of the spindle 2, and a driving mechanism controlled by the controller and driving the locking plate 42 to slidably move.

Referring to fig. 2, the first gear member 23 is provided with a locking protrusion 231 on a side surface facing away from the locking side plate 11. The locking protrusion 231 is provided with a first locking tooth surface 232 on the end surface facing away from the locking side plate 11, and locking protrusions 233 are uniformly arranged on the circumferential direction of the side wall of the locking protrusion 231, and the end of the locking protrusion 233 facing away from the locking side plate 11 is a guide arc surface 2331.

Referring to fig. 2 and 5, the locking plate 42 is disposed opposite to the first gear piece 23, and the locking plate 42 is provided with a locking recess 421 that mates with the locking protrusion 231 of the first gear piece 23. The bottom surface of the locking recess 421 is provided with a second locking tooth surface 422 that cooperates with the first locking tooth surface 232. The side walls of the locking groove 421 are also provided with locking teeth grooves 423 into which the locking teeth 233 of the first gear member 23 are inserted. The locking spline 423 has a vertical stop surface 4231 and an inclined guide surface 4232.

Referring to fig. 2 and 5, when the locking convex portion 231 of the first gear member 23 protrudes into the locking recess 421 of the locking plate 42, the first locking tooth face 232 and the second locking tooth face 422 are gradually engaged, and finally locking of the first locking tooth face 232 and the second locking tooth face 422 is achieved. During the engagement of the first locking tooth surface 232 and the second locking tooth surface 422, the locking protrusion 231 slides along the inclined guide surface 4232 of the locking tooth groove 423; after the first locking tooth surface 232 and the second locking tooth surface 422 are locked, the locking protrusion 231 abuts against the vertical stop surface 4231, and locking is also achieved.

Referring to fig. 4, the locking bracket 41 is also C-shaped, and includes a first side plate 411 and a second side plate 412 connected to the locking side plate 11, and a third side plate 413 connected to the first side plate 411 and the second side plate 412 and parallel to the locking side plate 11. Two locking slide rails 414 parallel to the axis of the spindle 2 are disposed on the first side plate 411 and the second side plate 412. The locking plate 42 is provided with locking runners 424 that mate with the locking slide 414 in a one-to-one correspondence.

Referring to fig. 4, the driving mechanism includes a driving screw 51, a first screw nut 52, and a screw motor 53. The drive screw 51 is rotatably mounted to the locking bracket 41 and the axis of the drive screw 51 coincides with the axis of the spindle 2. The first lead screw nut 52 is mounted to the lock plate 42 and engages with the drive lead screw 51. The lead screw motor 53 is installed outside the third side plate 413 of the locking bracket 41, and the lead screw motor 53 is controlled by the controller and drives the lead screw 51 to rotate.

Referring to fig. 3 and 6, a drive screw 51 extends axially through the spindle 2 and has a drive gear 54 mounted at the end extending beyond the reset end 22. Wherein the drive gear 54 rotates synchronously with the drive screw 51.

Referring to fig. 6 and 7, the reset side plate 12 is further provided with a transmission mechanism on the outer wall thereof. The transmission mechanism includes a transmission shaft 61, a first gear 62 rotatably mounted to the transmission shaft 61 and engaged with the third gear member 24, a second gear 63 rotatably mounted to the transmission shaft 61 and engaged with the driving gear 54, and a pressure spring 64 mounted between the first gear 62 and the second gear 63.

The first gear 62 is provided with a first projection 621 on a side surface facing the second gear 63. The first protrusion 621 is provided with a first transmission tooth surface 622. The second gear 63 is provided with a second projection 631 facing the first projection 621. The second convex portion 631 has a second power transmission tooth surface 632. Both ends of the pressure spring 64 are fixed to the first convex portion 621 and the second convex portion 631, respectively, so that the second gear 63 always has a tendency to slide in a direction away from the first gear 62. The transmission shaft 61 has a limit ring 611 for limiting the first gear 62 to slide toward the reset side plate 12. The end of the drive shaft 61 remote from the reset side plate 12 is also threadedly mounted with a stop nut 612 that prevents the second gear 63 from disengaging from the drive shaft 61.

Referring to fig. 6 and 7, when the first gear 62 and the second gear 63 are engaged with each other via the first transmission tooth surface 622 and the second transmission tooth surface 632, the driving screw 51 can transmit torque to the spindle 2 via the driving gear 54, the second gear 63, the first gear 62, and the third gear member 24 in this order, thereby driving the spindle 2 to rotate in the belt unwinding direction. In this embodiment, the drive screw 51 rotates one revolution and the spindle 2 rotates two revolutions.

Referring to fig. 1 and 8, the webbing retractor is also provided with a trigger mechanism. The trigger mechanism comprises a trigger bracket 71, a trigger plate 72 which is slidably mounted on the trigger bracket 71 along the circumferential direction of the mandrel 2, a second lead screw nut 73 which is mounted on the trigger plate 72 and is matched with the driving lead screw 51, and an elastic trigger 74 which is mounted on the trigger plate 72 and is opposite to the second gear 63.

The trigger plate 72 includes a fourth side plate 711 and a fifth side plate 712 mounted on the outer side of the reset side plate 12, and a sixth side plate 713 connecting the fourth side plate 711 and the fifth side plate 712 and parallel to the reset side plate 12. The end of the drive screw 51 that extends out of the reset side plate 12 is rotatably mounted to the sixth side plate 713. The fourth side plate 711 and the fifth side plate 712 are both provided with two trigger slide rails 714. The trigger plate 72 is provided with a trigger chute 721 cooperating with the trigger slide 714.

Referring to fig. 8 and 9, the elastic triggering member 74 includes a triggering bottom cylinder 741 fixed to the triggering plate 72, a triggering slide rod 742 slidably mounted in the triggering bottom cylinder 741, and a triggering spring 743 mounted in the triggering bottom cylinder 741 and abutting against the triggering slide rod 742. The end of the trigger slide 742 has a trigger hole 7421 into which the drive shaft 61 and the limit nut 612 are inserted. After the elastic triggering piece 74 presses the second gear 63 against the first gear 62, the elastic triggering piece 74 does not interfere with the continuous sliding of the triggering plate 72 in the process that the triggering plate 72 continuously slides towards the direction of the reset side plate 12.

Referring to fig. 1 and 10, the webbing retractor further includes a clockwork spring 32 and a return housing 31. The reset housing 31 is mounted inside the reset side plate 12. The spring 32 is installed in the reset housing 31, one end of the spring 32 is fixed to the spindle 2 and the other end is fixed to the inner wall of the reset housing 31, the spring 32 makes the spindle 2 have a tendency to rotate toward the tightening direction of the seat belt all the time, so that after a user pulls out the seat belt from the seat belt retractor, the seat belt can be automatically retracted under the action of the spring 32 after the user unlocks the buckle of the seat belt.

Referring to fig. 1 to 5, the locking plate 42 has a first position, a second position and a third position after being driven by the driving mechanism. When the lock plate 42 is in the first station, there is a gap between the lock plate 42 and the first gear piece 23; when the locking plate 42 is in the second station, the second locking tooth surface 422 of the locking plate 42 is locked with the first locking tooth surface 232 of the first gear piece 23, so that the locking plate 42 and the first gear piece 23 are locked, the first gear piece 23 and the spindle 2 cannot rotate continuously, and the safety belt cannot be continuously pulled out; when the first gear member 23 is located at the third station, the third station is located at a side of the first station away from the first station.

With reference to fig. 1, 6 to 10, the trigger plate 72 has a fourth station, a fifth station and a sixth station after being driven by the driving mechanism. When the trigger plate 72 is located at the fourth station, the elastic trigger 74 abuts against the second gear 63, and the second gear 63 is not meshed with the first gear 62; when the trigger plate 72 is located at the fifth station, the elastic trigger 74 is separated from the second gear 63; when the trigger plate 72 moves from the fourth station to the sixth station, the elastic trigger 74 presses the second gear 63, so that the second transmission tooth surface 632 of the second gear 63 is meshed with the first transmission tooth surface 622, and the lead screw motor sequentially drives the lead screw 51, the driving gear 54, the second gear 63, the first gear 62 and the third gear to transmit torque to the spindle 2, so that the spindle 2 rotates and outputs a length of the safety belt.

Referring to fig. 1, the webbing retractor further includes a detection device. The detection means includes an angular velocity sensor 8 for detecting the angular velocity of the second gear member 111 and outputting a detected value of the angular velocity, and a controller that presets a reference value of the angular velocity and compares the detected value of the angular velocity with the reference value of the angular velocity. Here, the angular velocity sensor 8 is mounted on the connection side plate 13 of the metal frame 1, and the detection end of the angular velocity sensor 8 faces the portion of the lock side plate 11 from which the second gear member 111 protrudes.

With reference to fig. 1 to 10, when the detected angular velocity value obtained by the angular velocity sensor 8 is greater than the reference angular velocity value, the controller controls the driving mechanism to move the locking plate 42 from the first station to the second station, and the locking plate 42 locks the first gear 23, so that the spindle 2 does not rotate continuously, the spindle 2 and the safety belt are locked, and the reliability of the safety belt retractor in a locked state is ensured; simultaneously, the trigger plate 72 is driven by the drive mechanism to move from the fourth station to the fifth station.

Defining a time node with an angular velocity detection value larger than an angular velocity reference value as a reference time node, taking the reference time node as a starting time node, and after a preset time period, controlling the driving mechanism by the controller to sequentially move the locking plate 42 from the second station to the first station and the third station, and when the locking plate 42 moves to the first station, unlocking the safety belt winding device, wherein the spindle 2 can normally rotate at the moment, and the safety belt can be normally drawn out.

The reference time node is used as a starting time node, after a preset time period passes, the controller controls the driving mechanism and sequentially moves the trigger plate 72 from the fifth station to the fourth station and the sixth station, and in the process that the trigger plate 72 moves from the fourth station to the sixth station, the screw motor sequentially drives the screw 51, the driving gear 54, the second gear 63, the first gear 62 and the third gear to transmit torque to the mandrel 2, so that the mandrel 2 rotates and outputs a safety belt for a certain length.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (7)

1. A safety belt winding device comprises a metal framework (1), a mandrel (2) which is rotatably installed on the metal framework (1) and is used for winding a safety belt, and a clockwork spring (32) which enables the mandrel (2) to have a tendency of rotating towards the tightening direction of the safety belt all the time, wherein the metal framework (1) comprises a locking side plate (11) and a resetting side plate (12), the safety belt winding device is characterized in that the mandrel (2) is provided with a locking end (21) penetrating through the locking side plate (11), a first gear piece (23) is installed at the locking end (21), and a first locking tooth surface (232) is arranged on the side surface, far away from the metal framework (1), of the first gear piece (23); the metal framework (1) is provided with a second gear piece (111) in transmission connection with the first gear piece (23), and the number of teeth of the second gear piece (111) is smaller than that of the first gear piece (23);

the webbing take-up device further includes a detection device including an angular velocity sensor (8) for detecting an angular velocity of the second gear member (111) and outputting a detected value of the angular velocity, and a controller that presets a reference value of the angular velocity and compares the detected value of the angular velocity with the reference value of the angular velocity;

the safety belt winding device further comprises a locking assembly, wherein the locking assembly comprises a locking bracket (41) mounted on the metal framework (1), a locking plate (42) mounted on the locking bracket (41) in a sliding mode along the axial direction of the mandrel (2), and a driving mechanism controlled by the controller and used for driving the locking plate (42) to slide; the locking plate (42) is opposite to the first gear piece (23) and has a second locking tooth surface (422) matched with the first locking tooth surface (232);

the locking plate (42) is provided with a first station and a second station after being driven by the driving mechanism; when the locking plate (42) is located at the first station, a gap exists between the locking plate (42) and the first gear piece (23); when the locking plate (42) is located at the second station, the second locking tooth surface (422) of the locking plate (42) is locked with the first locking tooth surface (232) of the first gear piece (23);

when the angular velocity detection value is larger than the angular velocity reference value, the controller controls the driving mechanism to move the locking plate (42) from the first station to the second station;

defining a time node, which is larger than the angular velocity reference value, of the angular velocity detection value as a reference time node, taking the reference time node as a starting time node, and after a preset time period, controlling a driving mechanism to reset a locking plate (42) from the second station to the first station by the controller;

the first gear piece (23) is provided with a locking convex part (231) at one side far away from the metal framework (1), the first locking tooth surface (232) is arranged on the locking convex part (231), and locking convex teeth (233) are uniformly distributed on the circumferential direction of the side wall of the locking convex part (231); one side of the locking convex tooth (233) facing the locking plate (42) is a guide arc surface (2331); the locking plate (42) is provided with a locking groove (421) for inserting the locking convex part (231), the second locking tooth surface (422) is arranged on the bottom surface of the locking groove (421), the locking plate (42) is provided with a locking tooth groove (423) for embedding the locking convex tooth (233) on the inner side wall of the locking groove (421), and the locking tooth groove (423) is provided with a third blocking surface and a third inclined surface; when the locking plate (42) is located at the second station, the locking convex teeth (233) abut against the third blocking surface.

2. A seat belt retractor according to claim 1, wherein the drive mechanism comprises a drive screw (51), a first screw nut (52) and a screw motor (53), the drive screw (51) being rotatably mounted to the locking bracket (41) and the axis of the drive screw (51) coinciding with the axis of the spindle (2); the first lead screw nut (52) is mounted on the locking plate (42) and is matched with the driving lead screw (51); the lead screw motor (53) is controlled by the controller and drives the driving lead screw (51) to rotate.

3. A seat belt retractor according to claim 2 wherein the spindle (2) has a reset end (22) extending through the reset side plate (12) and a third gear member (24) is mounted at the reset end (22); the driving screw rod (51) axially penetrates through the mandrel (2) and a driving gear (54) is installed at the end part extending out of the reset end (22);

the outer side wall of the reset side plate (12) is further provided with a transmission mechanism, and the transmission mechanism comprises a transmission shaft (61), a first gear (62) which is rotatably arranged on the transmission shaft (61) and is meshed with the third gear piece (24), a second gear (63) which is rotatably arranged on the transmission shaft (61) and is meshed with the driving gear (54), and a pressure spring (64) which is arranged between the first gear (62) and the second gear (63); the first gear (62) is provided with a first convex part (621) on the side surface facing the second gear (63), and the first convex part (621) is provided with a first transmission tooth surface (622); the second gear (63) is provided with a second convex part (631) opposite to the first convex part (621), and the second convex part (631) is provided with a second transmission tooth surface (632); both ends of the pressure spring (64) are fixed to the first convex part (621) and the second convex part (631) respectively;

the safety belt winding device is further provided with a trigger mechanism, the trigger mechanism comprises a trigger support (71) arranged on a reset side plate (12), a trigger plate (72) arranged on the trigger support (71) in a sliding mode along the axial direction of the mandrel (2), a second lead screw nut (73) arranged on the trigger plate (72) and matched with the driving lead screw (51), and an elastic trigger piece (74) arranged on the trigger plate (72) and opposite to the second gear (63);

the trigger plate (72) is driven by the driving mechanism and then is provided with a fourth station, a fifth station and a sixth station; when the trigger plate (72) is in the fourth station, the elastic trigger piece (74) is abutted with the second gear (63), and the second gear (63) is not meshed with the first gear (62); when the trigger plate (72) is in the fifth station, the locking plate (42) is in the second station; when the trigger plate (72) moves from the fourth station to the sixth station, the elastic trigger piece (74) presses the second gear (63), the second transmission tooth surface (632) is meshed with the first transmission tooth surface (622), and the lead screw motor (53) drives the mandrel (2) to rotate in a belt unwinding direction;

and after the reference time node is used as a starting time node and the preset time period passes, the controller controls the driving mechanism to sequentially move the trigger plate (72) from the fifth station to the fourth station and the sixth station.

4. The webbing retractor of claim 3, wherein the resilient trigger member (74) comprises a trigger base cylinder (741) fixed to the trigger plate (72), a trigger slide (742) slidably mounted within the trigger base cylinder (741), and a trigger spring (743) mounted within the trigger base cylinder (741) and abutting against the trigger slide (742); the end of the trigger slide bar (742) has a trigger hole (7421) for the transmission shaft (61) to be inserted into.

5. A seat belt retractor according to claim 3 wherein the locking plate (42) has at least two locking runners (424) formed circumferentially thereon, the locking bracket (41) having a locking slide (414) engaging the locking runners (424); at least two trigger chutes (721) are formed in the circumferential direction of the trigger plate (72), and the trigger support (71) is provided with a trigger slide rail (714) matched with the trigger chutes (721).

6. A safety belt retractor according to claim 1, wherein a return housing (31) is mounted inside the return side plate (12), the spring (32) is mounted in the return housing (31), one end of the spring (32) is fixed to the spindle (2) and the other end is fixed to the return housing (31).

7. A safety belt retractor according to claim 1, wherein the metal frame (1) has a connecting side plate (13) connecting the locking side plate (11) and the return side plate (12); the second gear member (111) extends to the outside of the lock side plate (11), and the angular velocity sensor (8) is mounted to the connection side plate (13).

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