An intelligent active pre-tensioning seat belt device for commercial vehicles

Abstract

The present invention discloses an intelligent active pre-tensioned seat belt device for commercial vehicles, comprising a base, a speed change mechanism, a retractor assembly, an automatic recovery mechanism and a locking mechanism. A motor is arranged on the base, and the motor is connected to the base through a mounting plate. The speed change mechanism is arranged on the base, and the output end of the motor is transmission-connected to the input end of the speed change mechanism. The retractor assembly is arranged above the base, and the output end of the speed change mechanism is connected to the retractor assembly. When the vehicle deviates from the lane or collides during driving, the present invention receives a signal through the motor, and the motor drives the speed change mechanism and the automatic recovery mechanism to quickly tighten the seat belt, which plays a role in quickly pre-tightening and protecting the safety of the driver and the passenger before the human body is hit. When the seat belt is used and the buckle is locked or unlocked, the motor drives the speed change mechanism and the automatic recovery mechanism to quickly tighten the seat belt, avoiding safety problems caused by inadequate webbing recovery or failure of the recovery coil spring.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, and in particular to an intelligent active pre-tightening seat belt device for commercial vehicles. Background Art

[0002] The purpose of a car seat belt is to restrain the occupants in a collision and to prevent the occupants from having a secondary collision with the steering wheel and dashboard, or from rushing out of the car and causing death or injury. A car seat belt can also be called a seat belt, which is a type of occupant restraint device. Car seat belts are recognized as the cheapest and most effective safety device, and many countries require the use of seat belts in vehicles.

[0003] Most of the existing seat belt products on the market have the following deficiencies: most of the existing commercial vehicle seat belts are not equipped with motors, and thus cannot be locked by motor drive. When the vehicle deviates from the lane or collides during driving, the seat belt cannot quickly pre-tighten to protect the driver and passengers before the human body feels the collision; at the same time, when the seat belt is used, the buckle is locked or unlocked, the seat belt has safety problems caused by the webbing not being recovered in place or the failure of the recovery coil spring, and during the use of the seat belt, there is a situation where the webbing is weak and the webbing is not recovered in place. It is only tightened by the recovery torsion spring, which is prone to failure after a long period of use, thereby affecting the use experience and even causing safety problems due to the failure of the seat belt. At the same time, the existing seat belts do not have the function of tilt locking. When the retractor is excessively tilted, it cannot reach the locked state, which affects the use of the seat belt. At the same time, when an emergency situation during the driving of the vehicle causes the seat belt to be pulled quickly outward, it does not have the function of accelerated locking, which also affects the safety of the seat belt. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an intelligent active pretensioning seat belt device for commercial vehicles, comprising a base, a speed change mechanism, a retractor assembly, an automatic recovery mechanism and a locking mechanism. A motor is arranged on the base, and the motor is connected to the base through a mounting plate. The speed change mechanism is arranged on the base, and the output end of the motor is transmission-connected to the input end of the speed change mechanism. The retractor assembly is arranged above the base, and the output end of the speed change mechanism is connected to the retractor assembly. The bottom of the base is connected to the automatic recovery mechanism by arranging a gasket, and the automatic recovery mechanism is connected to the bottom end of the retractor assembly. A locking mechanism is arranged above the retractor assembly, and the locking mechanism is connected to the retractor assembly through a retractor bracket.

[0005] Preferably, the speed change mechanism includes a driving gear, a driven gear, a worm and a transmission gear ring, the driving gear is arranged on the output end of the motor, one end of the driving gear is vertically meshed with the driven gear, the driven gear is sleeved on one end of the worm, and the end of the worm away from the driven gear is meshed with the external teeth of the transmission gear ring, the driving gear, the driven gear, the worm and the transmission gear ring are all arranged in an installation groove, and the installation groove is opened in the base, the driving gear and the driven gear cooperate to form the input end of the speed change mechanism and the output end of the motor transmission connection, the worm and the transmission gear ring cooperate to form the output end of the speed change mechanism and the reel assembly is connected.

[0006] Preferably, the reel assembly comprises a reel bracket, a reel, a rotating shaft, a transmission bottom ring, a limit stopper, a first pawl, a second pawl and an auxiliary gasket, the reel bracket is connected to the base through a locking bolt, the reel bracket is provided with the reel, an inner gear ring is provided outside the top end of the reel, the inner gear ring is opened in the top end of the reel bracket, the rotating shaft is provided in the reel, the bottom end of the rotating shaft is connected to the transmission column block, the transmission bottom ring is provided outside the bottom end of the rotating shaft, the transmission bottom ring is connected to the bottom of the reel, the inner wall of the transmission bottom ring is provided with inner teeth, and the transmission A plurality of limit baffles are evenly distributed on the circumference of the moving bottom ring with the rotating shaft as the center, and the limit baffles are arranged as an outer ring limit baffle group and an inner ring limit baffle group. Two groups of the first pawls are symmetrically arranged on the left and right sides of the transmission bottom ring with the rotating shaft as the symmetry center, and the first pawl is arranged between the limit baffles. The second pawl is arranged in the top end of the winding wheel, and the second pawl is movably arranged in the limit groove, and the limit groove is opened in the top end of the winding wheel. A limit rod is arranged on the top end of the second pawl, and the auxiliary gasket is arranged on the outer sleeve of the top end of the rotating shaft, and one end of the second pawl is meshed with the inner gear ring.

[0007] Preferably, a limiting slide groove is provided in the transmission gear ring, the limiting slide groove is connected to the first pawl, and the auxiliary gasket is arranged at the top end of the reel.

[0008] Preferably, the locking mechanism comprises a steel ball, a lever, a locking gear ring, a third pawl, an inertia block, an auxiliary locking end cover and a top shell. A steel ball placement frame is provided at the top of the retractor bracket, the steel ball is provided in the steel ball placement frame, the lever is hinged on the steel ball placement frame, the lever is provided beside one end of the steel ball, the locking gear ring is provided beside the end of the lever away from the steel ball placement frame, external teeth are provided on the outer ring surface of the locking gear ring, the locking gear ring is sleeved on the rotating shaft, a positioning column is provided in the locking gear ring, the third pawl is movably connected to the positioning column, the inertia block is provided on the upper end of the third pawl, the inertia block is provided in the locking gear ring, the auxiliary locking end cover is provided outside the locking gear ring, an inner gear ring is provided in the auxiliary locking end cover to mesh with the third pawl, the top shell is provided outside the auxiliary locking end cover, and the top shell is connected to the retractor bracket through a locking bolt.

[0009] Preferably, the auxiliary gasket is arranged between the locking gear ring and the reel, a limiting groove is opened in the locking gear ring, the limiting rod is arranged in the limiting groove, the automatic recovery mechanism, the reel assembly and the locking mechanism are on the same center line, one end of the motor is electrically connected to the signal line, and a safety belt is wrapped around the outside of the reel.

[0010] Preferably, the automatic recovery mechanism includes a bottom shell, a clockwork spring, a gasket and a transmission column block, the clockwork spring is arranged in the bottom shell, one end of the clockwork spring at the center is connected to the transmission column block, the outer ring end of the clockwork spring is connected to the bottom shell, the gasket is arranged outside the transmission column block, the gasket is arranged between the clockwork spring and the base, and the bottom shell is connected to the bottom end of the base through a locking bolt.

[0011] The beneficial effects of the present invention are: reasonable structural design, convenient operation, when the vehicle deviates from the lane or collides during driving, the vehicle control system transmits a signal to the motor, and the motor drives the speed change mechanism and the automatic recovery mechanism to quickly tighten the seat belt, which plays a role in quickly pre-tightening and protecting the safety of the driver and passengers before the human body feels the collision;

[0012] When the seat belt is in use, or the buckle is locked or unlocked, the motor works after receiving the command signal from the vehicle control system, and the motor drives the speed change mechanism and the automatic recovery mechanism to quickly tighten the seat belt, thereby avoiding safety problems caused by insufficient webbing recovery or failure of the recovery coil spring; at the same time, the motor works in conjunction with the speed change mechanism and the automatic recovery mechanism to achieve the function of auxiliary recovery of the seat belt, thereby avoiding safety problems caused by insufficient webbing recovery, insufficient webbing recovery and failure of the recovery torsion spring; at the same time, the locking mechanism is set to utilize the effects of tilt locking and acceleration locking to achieve the required locking effect, thereby ensuring the reliability and stability of the seat belt; the tilt locking setting in the locking mechanism enables the retractor to achieve a locking effect when it tilts at a certain angle, thereby ensuring the reliability of the seat belt; at the same time, the acceleration locking setting in the locking mechanism enables the webbing to achieve a locking effect when it accelerates outward under the action of external force, thereby ensuring the stability of the seat belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0014] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0016] Figure 3 yes Figure 2 A is a schematic diagram of a partially enlarged detailed structure;

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the base, worm and transmission gear ring in the present invention;

[0018] Figure 5 It is a three-dimensional structural schematic diagram of the reel, the transmission gear ring, the locking gear ring and the inertia block in the present invention;

[0019] Figure 6 It is a three-dimensional structural schematic diagram of the winding wheel, the locking gear ring and the third pawl in the present invention;

[0020] Figure 7 It is a schematic diagram of the three-dimensional structure of the reel, the second pawl and the rotating shaft in the present invention;

[0021] Figure 8 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Fig. 9 It is a three-dimensional structural schematic diagram of the present invention.

[0023] In the figure: 1. motor; 2. base; 3. mounting plate; 4. gasket; 5. driving gear; 6. driven gear; 7. worm; 8. transmission gear ring; 9. mounting groove; 10. bottom shell; 101. transmission column block; 11. spring; 12. retractor bracket; 13. reel; 14. rotating shaft; 15. transmission bottom ring; 16. limiting baffle; 17. first pawl; 18. auxiliary gasket; 19. second pawl; 20. limiting rod; 21. inner gear ring; 22. steel ball placement frame; 23. steel ball; 24. lever; 25. locking gear ring; 26. third pawl; 27. inertia block; 28. auxiliary locking end cover; 29. ​​top shell; 30. positioning column; 31. signal line. DETAILED DESCRIPTION

[0024] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0026] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, welding, riveting, bonding, etc., or a detachable connection, threaded connection, key connection, pin connection, etc., or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-9An intelligent active pretensioning seat belt device for a commercial vehicle shown in the figure includes a base 2, a speed change mechanism, a retractor assembly, an automatic recovery mechanism and a locking mechanism. A motor 1 is arranged on the base 2, and the motor 1 is connected to the base 2 through a mounting plate 3. The speed change mechanism is arranged on the base 2, and the output end of the motor 1 is transmission-connected to the input end of the speed change mechanism. The retractor assembly is arranged above the base 2, and the output end of the speed change mechanism is connected to the retractor assembly. The base 2 is connected to the automatic recovery mechanism by arranging a gasket 4 below, and the automatic recovery mechanism is connected to the bottom end of the retractor assembly. A locking mechanism is arranged above the retractor assembly, and the locking mechanism is connected to the retractor assembly through a retractor bracket 12. The speed change mechanism includes a driving gear 5, a driven gear 6, a worm 7 and a transmission ring gear 8. The driving gear 5 is arranged on the output end of the motor 1. One end of the driving gear 5 is vertically meshed with the driven gear 6. The driven gear 6 is sleeved on one end of the worm 7. The end of the worm 7 away from the driven gear 6 is meshed with the external teeth of the transmission ring gear 8. The driving gear 5, the driven gear 6, the worm 7 and the transmission ring gear 8 are all arranged in a mounting groove 9. The mounting groove 9 is opened in the base 2. The driving gear 5 cooperates with the driven gear 6 to form an input end of the speed change mechanism that is transmission-connected to the output end of the motor 1. The worm 7 and the transmission ring gear 8 cooperate to form an output end of the speed change mechanism that is connected to the retractor assembly. The reel assembly includes a reel bracket 12, a reel 13, a rotating shaft 14, a transmission bottom ring 15, a limit stopper 16, a first pawl 17, a second pawl 19 and an auxiliary gasket 18. The reel bracket 12 is connected to the base 2 through a locking bolt. The reel 13 is arranged in the reel bracket 12. An inner gear ring 21 is arranged outside the top of the reel 13. The inner gear ring 21 is opened in the top of the reel bracket 12. The rotating shaft 14 is arranged in the reel 13. The bottom end of the rotating shaft 14 is connected to the transmission column block 101. The transmission bottom ring 15 is arranged outside the bottom end of the rotating shaft 14. The transmission bottom ring 15 is connected to the bottom end of the reel 13. The inner wall of the transmission bottom ring 15 is provided with an inner gear. A plurality of limit baffles 16 are evenly distributed in the transmission bottom ring 15 with the rotating shaft 14 as the center of the circle. The limit baffles 16 are arranged as an outer ring limit baffle group and an inner ring limit baffle group. Two groups of first pawls 17 are symmetrically arranged in the transmission bottom ring 15 with the rotating shaft 14 as the symmetry center. The first pawl 17 is arranged between the limit baffles 16. The second pawl 19 is arranged in the top end of the winding wheel 13. The second pawl 19 is movably arranged in the limit groove. The limit groove is opened in the top end of the winding wheel 13. A limit rod 20 is arranged at the top end of the second pawl 19. The auxiliary gasket 18 is arranged on the outer surface of the top end of the rotating shaft 14. One end of the second pawl 19 is meshed with the inner gear ring 21.The transmission gear ring 8 is provided with a limit slide groove, and the limit slide groove is connected to the first pawl 17. The auxiliary gasket 18 is arranged at the top of the reel 13. The locking mechanism includes a steel ball 23, a lever 24, a locking gear ring 25, a third pawl 26, an inertia block 27, an auxiliary locking end cover 28 and a top shell 29. A steel ball placement frame 22 is arranged at the top of the reel bracket 12. The steel ball 23 is arranged in the steel ball placement frame 22. The lever 24 is hinged on the steel ball placement frame 22. The lever 24 is arranged beside one end of the steel ball 23. The locking gear ring 25 is arranged beside the end of the lever 24 away from the steel ball placement frame 22. The outer ring surface of the locking gear ring 25 is provided with external teeth. The locking gear ring 25 is sleeved on the rotating shaft 14. A positioning column 30 is arranged in the locking gear ring 25. The third pawl 26 is movably connected to the positioning column 30. The inertia block 27 is arranged on the upper end of the third pawl 26. The inertia block 27 is arranged in the locking gear ring 25. The auxiliary locking end cover 28 is arranged outside the locking gear ring 25. The inner gear ring is arranged inside the auxiliary locking end cover 28 to mesh with the third pawl 26. The top shell 29 is arranged outside the auxiliary locking end cover 28. The top shell 29 is connected to the retractor bracket 12 through a locking bolt. The auxiliary gasket 18 is arranged between the locking gear ring 25 and the reel 13. A limiting groove is provided in the locking gear ring 25. The limiting rod 20 is arranged in the limiting groove. The automatic recovery mechanism, the retractor assembly and the locking mechanism are on the same center line. One end of the motor 1 is electrically connected to the signal line 31. The reel 13 is wrapped with a safety belt. The automatic recovery mechanism includes a bottom shell 10, a spring 11, a gasket 4 and a transmission column block 101. The spring 11 is arranged in the bottom shell 10, one end of the spring 11 at the center is connected to the transmission column block 101, the outer ring end of the spring 11 is connected to the bottom shell 10, the gasket 4 is arranged outside the transmission column block 101, the gasket 4 is arranged between the spring 11 and the base 2, and the bottom shell 10 is connected to the bottom end of the base 2 through a locking bolt. A plurality of limit blocks are evenly distributed in the outer ring of the bottom end of the inertia block 27 and the locking gear ring 25 beside one end of the third pawl 26. One end of the third pawl 26 is set to be an engagement locking end that is engaged with the inner gear ring in the auxiliary locking end cover 28, and the third pawl 26 is connected to the limit block of the locking gear ring 25 away from its engagement locking end through a reset spring. The second pawl 19 cooperates with the inner gear ring 21, the first pawl 17 cooperates with the inner teeth of the transmission bottom ring 15, the lever 24 cooperates with the outer teeth of the locking gear ring 25, and the third pawl 26 cooperates with the inner gear ring of the auxiliary locking end cover 28 to achieve a meshing and locking effect.The motor 1 drives the driving gear 5 in the speed change mechanism to rotate and cooperate with the driven gear 6 to drive the worm 7 to rotate, thereby transmitting the force to the transmission gear ring 8 in the retractor assembly, and then the transmission gear ring 8 rotates to drive the first pawl 17 to movably engage with the inner teeth of the transmission bottom ring 15, and drive the reel 13 to rotate to achieve the seat belt tightening effect. The steel ball 28 is movably arranged in the steel ball placement frame 22. When the retractor bracket 12 is tilted in any direction at an installation position of less than 28 degrees, the steel ball 28 cannot fall out of the steel ball placement frame 22. When the tilt angle is greater than 28 degrees, the steel ball 28 falls out of the steel ball placement frame 22, thereby driving the lever 24 to rotate and engage and lock the outer tooth circle of the locking gear ring 25, thereby achieving the effect of locking the reel 13.

[0029] The working principle of this specific embodiment is as follows: when the safety belt is pulled out, the spring 11 tightens and reserves elastic potential energy; when the safety belt is unlocked, the spring 11 releases the elastic potential energy to retract the safety belt. During the webbing retraction period, the motor 1 works to rotate the driving gear 5, and the driven gear 6 is rotated through meshing, thereby driving the worm 7 to rotate, and transmitting the force to the transmission ring gear 8 in the retractor assembly, so that the transmission ring gear 8 rotates and drives the first pawl 17 to movably mesh with the inner teeth of the transmission bottom ring 15, and drives the reel 13 to rotate to achieve the effect of the reel 13 assisting in retracting the safety belt;

[0030] When the retractor assembly tilts at a certain angle, and the tilt exceeds 28 degrees, the steel ball 23 slides outwards and drives the lever 24 to lock the outer tooth circle of the locking gear ring 25, so that the locking gear ring 25 cannot rotate, and then the seat belt drives the reel 13 to be pulled outwards. At this time, the limiting rod 20 on the second pawl 19 moves to the limit position in the limiting groove in the locking gear ring 25, so that the second pawl 19 slides outwards in the reel groove at the top of the reel 13 and meshes and locks with the inner gear ring 21 of the retractor bracket 12, thereby achieving the effect of tilt locking;

[0031] When an external force acts on the seat belt, the seat belt moves outward, and the acceleration is greater than 2.0g, the inertia block 27 remains in its original state, and the third ratchet 26 moves outward to clamp the inner tooth circle of the auxiliary locking end cover 28, so that the locking gear ring 25 cannot rotate, and then the seat belt drives the reel 13 to be pulled outward. At this time, the limiting rod 20 on the second ratchet 19 moves to the limit position in the limiting groove in the locking gear ring 25, so that the second ratchet 19 slides outward in the reel groove at the top of the reel 13 and meshes and locks with the inner gear ring 21 of the retractor bracket 12, thereby achieving the effect of accelerated locking;

[0032] When the vehicle deviates from the lane or collides during driving, the vehicle control system transmits a signal to the controller, and the motor 1 starts to work after receiving the command signal from the controller. The motor 1 drives the speed change mechanism and the automatic recovery mechanism to quickly tighten the seat belt, which plays a role in quickly pre-tightening and protecting the safety of the driver and passengers before the human body feels the collision;

[0033] When the seat belt is used, or the buckle is locked or unlocked, motor 1 starts working after receiving a command signal from the vehicle control system. Motor 1 drives the speed change mechanism and the automatic recovery mechanism to quickly tighten the seat belt, avoiding safety problems caused by inadequate webbing recovery or failure of the recovery coil spring.

[0034] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An intelligent active pre-tensioning seat belt device for a commercial vehicle, comprising a base (2) and a transmission column block (101), Features: It also includes a speed change mechanism, a retractor assembly, an automatic recovery mechanism and a locking mechanism. A motor (1) is arranged on the base (2), and the motor (1) is connected to the base (2) through a mounting plate (3). The speed change mechanism is arranged on the base (2), and the output end of the motor (1) is in transmission connection with the input end of the speed change mechanism. The retractor assembly is arranged above the base (2), and the output end of the speed change mechanism is connected to the retractor assembly. The base (2) is connected to the automatic recovery mechanism through a gasket (4) arranged below, and the automatic recovery mechanism is connected to the bottom end of the retractor assembly. A locking mechanism is arranged above the retractor assembly, and the locking mechanism is connected to the retractor assembly through a retractor bracket (12). The retractor assembly includes a retractor bracket (12), a reel (13), a rotating shaft (14), a transmission bottom ring (15), a limit stop (16), a first pawl (17), a second pawl (19) and an auxiliary gasket (18). The retractor bracket (12) is connected to the base (2) through a locking bolt. The reel (13) is arranged inside the retractor bracket (12). An internal gear ring (21) is arranged outside the top end of the reel (13), and the internal gear ring (21) is arranged inside the top end of the retractor bracket (12). The rotating shaft (14) is arranged inside the reel (13), and the bottom end of the rotating shaft (14) is connected to the transmission column block (101). The transmission bottom ring (15) is arranged outside the bottom end of the rotating shaft (14), and the transmission bottom ring (15) is connected to the bottom end of the reel (13). Internal teeth are provided on the inner wall of the transmission bottom ring (15). A plurality of the limit stops (16) are evenly distributed in a circle with the rotating shaft (14) as the center inside the transmission bottom ring (15). The limit stops (16) are set as an outer ring limit stop group and an inner ring limit stop group. Two groups of the first pawls (17) are symmetrically arranged left and right with the rotating shaft (14) as the symmetry center inside the transmission bottom ring (15), and the first pawls (17) are arranged between the limit stops (16). The second pawl (19) is arranged inside the top end of the reel (13), and the second pawl (19) is movably arranged in a limit groove. The limit groove is arranged inside the top end of the reel (13). A limit rod (20) is arranged at the top end of the second pawl (19). The auxiliary gasket (18) is sleeved outside the top end of the rotating shaft (14). One end of the second pawl (19) meshes with the internal gear ring (21). The locking mechanism includes a steel ball (23), a lever (24), a locking gear ring (25), a third pawl (26), an inertia block (27), an auxiliary locking end cover (28) and a top shell (29). A steel ball placement frame (22) is arranged at the top end of the retractor bracket (12), the steel ball (23) is arranged inside the steel ball placement frame (22), the lever (24) is hinged on the steel ball placement frame (22), the lever (24) is arranged beside one end of the steel ball (23), and the locking gear ring (25) is arranged beside the end of the lever (24) away from the steel ball placement frame (22).The outer ring surface of the locking gear ring (25) is provided with external teeth. The locking gear ring (25) is sleeved on the rotating shaft (14). A positioning column (30) is provided inside the locking gear ring (25). The third pawl (26) is movably connected to the positioning column (30). The inertia block (27) is provided at the upper end of the third pawl (26). The inertia block (27) is provided inside the locking gear ring (25). The auxiliary locking end cover (28) is provided outside the locking gear ring (25). An inner gear ring is provided inside the auxiliary locking end cover (28) to mesh with the third pawl (26). The top shell (29) is provided outside the auxiliary locking end cover (28). The top shell (29) is connected to the retractor bracket (12) through a locking bolt.

2. An intelligent active pre-tensioning seat belt device for commercial vehicles according to claim 1, Features: The speed change mechanism comprises a driving gear (5), a driven gear (6), a worm (7) and a transmission gear ring (8). The driving gear (5) is sleeved on the output shaft of the motor (1). One end of the driving gear (5) is vertically meshed with the driven gear (6). The driven gear (6) is sleeved on one end of the worm (7). One end of the worm (7) away from the driven gear (6) is meshed with the external teeth of the transmission gear ring (8). The driving gear (5), the driven gear (6), the worm (7) and the transmission gear ring (8) are all arranged in a mounting groove (9). The mounting groove (9) is formed in the base (2). The driving gear (5) and the driven gear (6) cooperate to form an input end of the speed change mechanism that is transmission-connected to an output end of the motor (1). The worm (7) and the transmission gear ring (8) cooperate to form an output end of the speed change mechanism that is connected to the retractor assembly.

3. An intelligent active pre-tensioning seat belt device for commercial vehicles according to claim 2, It is characterized in that A limiting sliding groove is provided in the transmission gear ring (8), the limiting sliding groove is connected to the first ratchet (17), and the auxiliary gasket (18) is arranged at the top end of the reel (13).

4. The intelligent active pre-tensioning seat belt device for commercial vehicles according to claim 1, Features: The auxiliary gasket (18) is arranged between the locking gear ring (25) and the reel (13); a limiting groove is provided in the locking gear ring (25); the limiting rod (20) is arranged in the limiting groove; the automatic recovery mechanism, the retractor assembly and the locking mechanism are on the same center line; one end of the motor (1) is electrically connected to a signal line (31); and a safety belt is wrapped around the reel (13).

5. An intelligent active pre-tensioning seat belt device for commercial vehicles according to any one of claims 1 to 4, Features: The automatic recovery mechanism comprises a bottom shell (10), a spring (11), a gasket (4) and a transmission column block (101); the spring (11) is arranged in the bottom shell (10); one end of the spring (11) at the center is connected to the transmission column block (101); the outer ring end of the spring (11) is connected to the bottom shell (10); the gasket (4) is arranged outside the transmission column block (101); the gasket (4) is arranged between the spring (11) and the base (2); and the bottom shell (10) is connected to the bottom end of the base (2) via a locking bolt.

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