Active pre-tightening force limiting type safety belt with improved clutch

Abstract

The invention discloses an active pre-tightening force-limiting type safety belt with an improved clutch. The active pre-tightening force-limiting type safety belt comprises a frame; the mandrel assembly is used for connecting and winding the braid; the clutch is used for realizing positive and negative rotation of the mandrel assembly; the locking assembly is used for limiting and locking the mandrel assembly in case of emergency; the motor is arranged on the frame; the transmission assembly is arranged on the frame, is in transmission connection with the clutch and the motor and is used for transmission between the motor and the clutch; the shell is arranged on the surface of the transmission assembly in a sleeving mode and used for protecting the transmission assembly; the coil spring assembly is arranged on the shell, is connected with the core shaft assembly and is used for resetting the core shaft assembly; compared with a traditional outer ratchet wheel type clutch, the inner ratchet wheel type clutch is arranged, so that the response time of overall transmission of the active pre-tightening force limiting type safety belt is shorter; the active pre-tightening force limiting type safety belt can be locked in time in emergency through the locking assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of active pre-tensioning seat belts, and specifically to an active pre-tensioning force-limiting seat belt with an improved clutch. Background Art

[0002] Traditional seat belts cannot achieve user-friendly functions and lack a force-limiting device, resulting in insufficient protection for the human chest. Therefore, the safety of traditional seat belts is also worse than that of active pre-tensioning seat belts. An active pre-tensioning seat belt is an automotive safety device that combines active safety technology and passive safety technology. It can actively pre-tension the seat belt before a collision to restrain the driver and passengers in advance, thus significantly improving the safety of riding.

[0003] The active pre-tensioning seat belt cooperates with the vehicle's active safety system (such as the AEB automatic emergency braking system) to receive the vehicle's danger signal. When the vehicle sensor detects a potential collision danger, the active pre-tensioning device of the seat belt will be quickly activated. Through driving methods such as an electric motor or an explosive pre-tensioning device, the seat belt is tightened to eliminate the gap between the seat belt and the occupant, and the occupant is restrained to the seat. Before a collision occurs, the active pre-tensioning seat belt can correct the off-position sitting posture of the occupant, making them in a safer position and reducing the injuries during the collision.

[0004] Currently, the known active pre-tensioning seat belts on the market have a long response time and use more parts. Since active pre-tensioning seat belts are generally used in high-end motor vehicles and will also be popularized in better pure electric vehicles in the future, having more parts is likely to cause greater noise during operation, reducing the quality of high-end motor vehicles. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides an active pre-tensioning force-limiting seat belt with an improved clutch, aiming to solve the problems in the background art.

[0006] To achieve the above object, the present invention provides the following technical solution: An active pre-tensioning force-limiting seat belt with an improved clutch, comprising: a frame, circular through holes are respectively provided on both sides of the frame, and internal ratchets are provided in the circular through holes on one side; a core shaft assembly is provided inside the frame, and both ends thereof extend out of both sides of the frame; the end of the core shaft assembly extending out of the frame on the side away from the internal ratchet is connected to a clutch, and a locking assembly is provided on the other side, and the locking assembly is connected to the core shaft assembly; a motor is provided on the frame; a transmission assembly is provided on the side of the frame away from the internal ratchet, and the transmission assembly is respectively in transmission connection with the clutch and the motor; a housing is further provided on the side of the frame away from the internal ratchet for protecting the transmission assembly, and a spring assembly is provided on the housing, and the spring assembly is connected to the core shaft assembly; The locking assembly includes a vehicle-sensing housing, a pendulum wheel assembly, a vehicle-sensing assembly, and an accident locking shaft head. The accident locking shaft head is arranged in a circular through-hole with internal ratchets in the frame belt and is in transmission connection with the core shaft assembly. The pendulum wheel assembly is in transmission connection with the accident locking shaft head. The vehicle-sensing housing covers the pendulum wheel assembly and is arranged on one side of the internal ratchets in the frame belt. A vehicle-sensing assembly is arranged inside the vehicle-sensing housing for limiting the pendulum wheel assembly in special cases; The clutch includes a guiding worm gear, a first pawl, a blocking disc, and an internal ratchet. The guiding worm gear has a hollow structure with openings on both sides. An internal ratchet is movably sleeved inside it. A blocking disc is movably arranged inside the internal ratchet. Fixed seats are symmetrically arranged on the inner side surface of the blocking disc. The tail end of the first pawl is movably arranged on the fixed seat and can rotate around it. A limiting head is arranged on the first pawl. A limiting panel is arranged at the opening of the guiding worm gear close to the housing. A limiting sliding groove for cooperating with the first pawl is arranged on the limiting panel. The limiting head is slidably connected in the limiting sliding groove. A spline is arranged on the side surface of the internal ratchet away from the housing. The spline is connected to the end of the core shaft assembly extending out of the frame.

[0007] Further, the accident locking shaft head is composed of a shaft head, a circlip, a torsion spring, and a second pawl. The shaft head is connected to the end of the core shaft assembly far from the clutch. A fixed base is arranged on the surface of the shaft head opposite to the core shaft assembly. The fixed base is not at the center of the shaft head. The tail end of the second pawl is movably connected to the fixed base. A limiting column is arranged on the surface of the second pawl opposite to the shaft head. The center of the shaft head is connected to the core shaft assembly. A torsion spring for pressing against the limiting column is also arranged on the shaft head.

[0008] Further, the pendulum wheel assembly is composed of an external ratchet disc, a special-shaped locking pawl, a small compression spring, a sleeve, a V-shaped limiting sliding groove, and a limiting ratchet tooth. A sleeve is arranged at the center of the surface of the external ratchet disc opposite to the accident locking shaft head. A spring fixing seat is arranged on the arc surface of the sleeve. A small compression spring is arranged on the spring fixing seat. A boss is arranged on the surface of the external ratchet disc opposite to the accident locking shaft head. The special-shaped locking pawl is movably arranged on the boss. A limiting ratchet tooth for limiting the special-shaped locking pawl is also arranged on the surface of the external ratchet disc opposite to the accident locking shaft head. A V-shaped limiting sliding groove for cooperating with the limiting column of the second pawl is arranged on the external ratchet disc. The limiting column of the second pawl is slidably connected in the V-shaped limiting sliding groove.

[0009] Further, the vehicle-sensing assembly is composed of a vehicle-sensing base frame, a ball support, a small ball, and a locking ball cover. The vehicle-sensing base frame is arranged inside the vehicle-sensing housing and is at the bottom of the external ratchet disc. A ball support is embedded in the vehicle-sensing base frame. A small ball is placed inside the ball support. One end of the locking ball cover is movably connected to the vehicle-sensing base frame. The locking ball cover is horizontally above the small ball. A limiting clamping rod is arranged at the top of the locking ball cover and is directly opposite to the bottom of the external ratchet disc. The inner side surfaces of the ball support and the locking ball cover are both arc-shaped concave surfaces.

[0010] Further, the mandrel assembly is composed of a mandrel and a force-limiting shaft. The mandrel is movably arranged within the frame. One end of the mandrel is connected to one end of the force-limiting shaft, and the other end of the force-limiting shaft is connected to the shaft head. The end of the mandrel opposite to the force-limiting shaft is connected to a spline and then connected to the coil spring assembly through a shaft extension member.

[0011] Further, it also includes a control component housing arranged on the outer shell. A groove for the movement of the shaft extension member is provided between the outer shell and the control component housing, and the shaft extension member is arranged within the groove. Through holes for both ends of the shaft extension member to pass through are provided on both the outer shell and the control component housing. The coil spring assembly is arranged on the control component housing. One end of the shaft extension member passes through the through hole on the outer shell and is connected to the mandrel, and the other end of the shaft extension member passes through the through hole on the control component housing and is connected to the coil spring assembly.

[0012] Further, the transmission component is composed of a transmission rod and a fixing member. The transmission rod is connected to one side of the frame where the clutch is located through fixing members that are movably connected at both ends. Worms and worm gears are respectively arranged at both ends of the transmission rod. The worm gear on the transmission rod is in transmission connection with the worm on the motor drive end head, and the worm on the transmission rod is in transmission connection with the guiding worm gear.

[0013] Further, a limiting piece for restricting the movement range of the first pawl is also arranged on the blocking disc.

[0014] Further, a disc top is arranged between the spline and the blocking disc.

[0015] Compared with the existing technology, the present invention has the following beneficial effects:

[0016] (1) By setting an internal ratchet-type clutch in the present invention, compared with the traditional external ratchet-type clutch, the response time of the overall transmission of the active pre-tensioning force-limiting seat belt is shorter, providing a more abundant response time for the active pre-tensioning force-limiting seat belt, thereby improving the overall reliability; through the locking component, the active pre-tensioning force-limiting seat belt can be locked in time in case of an emergency.

[0017] (2) By setting an internal ratchet-type clutch in the present invention, compared with the traditional clutch, the overall volume is small, the weight is light, and the structure is compact, reducing the volume and mass of the overall seat belt, saving space in the vehicle and being more convenient for installation. Moreover, when the clutch operates normally, only the impact occurs when the ratchet teeth and the pawl are engaged, with a small vibration amplitude and low noise, improving the driving experience of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is an exploded view of the overall structure of the present invention.

[0020] Figure 3 Schematic diagram of the transmission component, motor and clutch connection structure of the present invention.

[0021] Figure 4 Exploded view of the front side of the clutch of the present invention.

[0022] Figure 5 Exploded view of the back side of the clutch of the present invention.

[0023] Figure 6 Schematic diagram of the structure of the blocking disc of the present invention.

[0024] Figure 7 Schematic diagram of the structure of the accident locking shaft head of the present invention.

[0025] Figure 8 Schematic diagram of the internal structure of the accident locking shaft head of the present invention.

[0026] Figure 9 Schematic diagram of the structure of the pendulum wheel assembly of the present invention.

[0027] Figure 10 Schematic diagram of the structure of the vehicle sensing component of the present invention.

[0028] Figure 11 Schematic diagram of the connection structure of the disc top of the present invention.

[0029] Figure 12 Schematic diagram of the structure of the coil spring assembly of the present invention.

[0030] Figure 13 Schematic diagram of the structure of the frame of the present invention.

[0031] In the figure, 1, frame; 101, positioning groove; 102, buckle; 103, positioning opening; 2, clutch; 201, guiding worm gear; 202, first pawl; 203, blocking disc; 204, internal ratchet wheel; 205, fixing seat; 206, limiting piece; 207, limiting head; 208, limiting panel; 209, limiting sliding groove; 2010, spline; 3, motor; 4, transmission component; 41, transmission rod; 42, fixing piece; 5, outer shell; 6, control component outer shell; 7, coil spring assembly; 71, cover plate; 72, coil spring; 73, core head; 8, vehicle sensing outer shell; 9, pendulum wheel assembly; 91, outer ratchet disc; 92, special-shaped locking pawl; 93, small compression spring; 94, sleeve; 95, V-shaped limiting sliding groove; 96, limiting ratchet teeth; 10, vehicle sensing component; 1011, vehicle sensing base frame; 1012, ball support; 1013, small ball; 1014, locking ball cover; 11, accident locking shaft head; 1111, shaft head; 1112, snap ring piece; 1113, torsion spring; 1114, second pawl; 12, core shaft; 13, disc top; 14, shaft extension piece; 15, force-limiting shaft. Detailed implementation manners

[0032] As Figure 1 , Figure 2 shown, the present invention provides a technical solution: an active pre-tightening force-limiting seat belt with an improved clutch, comprising:

[0033] A frame 1, circular through holes are respectively arranged on both sides of the frame 1, and internal ratchet teeth are arranged in the circular through hole on one side.

[0034] A core shaft assembly, the core shaft assembly is arranged in the frame 1, and both ends extend out of both sides of the frame 1 through the circular through holes for connecting and retracting the webbing.

[0035] A clutch 2, the clutch 2 is installed at the end of the core shaft assembly extending from the side of the frame 1 away from the internal ratchet teeth for realizing the forward and reverse rotation of the core shaft assembly.

[0036] A locking assembly, the locking assembly is arranged on the side of the frame 1 away from the clutch 2 and is connected to the core shaft assembly for limiting and locking the core shaft assembly in case of an emergency.

[0037] A motor 3, the motor 3 is arranged on the frame 1.

[0038] A transmission assembly 4, the transmission assembly 4 is arranged on the side of the frame 1 away from the internal ratchet teeth and is respectively in transmission connection with the clutch 2 and the motor 3 for the transmission between the motor 3 and the clutch 2.

[0039] A housing 5, the housing 5 is arranged on the side of the frame 1 away from the internal ratchet teeth for protecting the transmission assembly 4.

[0040] A torsion spring assembly 7, the torsion spring assembly 7 is arranged on the housing 5 and is connected to the core shaft assembly for resetting the core shaft assembly.

[0041] As Figure 3 shown, the transmission assembly 4 is composed of a transmission rod 41 and a fixing member 42; the transmission rod 41 is connected to the frame 1 on the side of the clutch 2 through the fixing member 42 movably connected at both ends; worm wheels and worm shafts are respectively arranged at both ends of the transmission rod 41.

[0042] As Figures 4 - 6As shown in the figure, the clutch 2 includes a guiding worm gear 201, a first pawl 202, a blocking disc 203 and an internal ratchet wheel 204. The guiding worm gear 201 is hollow inside and open at both sides. An internal ratchet wheel 204 is movably sleeved inside the guiding worm gear 201. A blocking disc 203 is movably arranged inside the internal ratchet wheel 204. Fixed seats 205 are symmetrically arranged on the inner side surface of the blocking disc 203. The tail end of the first pawl 202 is movably arranged on the fixed seat 205. The first pawl 202 makes a circular motion around the fixed seat 205 through its tail end. A limiting head 207 is further arranged on the first pawl 202. A limiting panel 208 is arranged at the opening on one side of the guiding worm gear 201 facing the housing 5. A limiting sliding groove 209 for cooperating with the first pawl 202 is arranged on the limiting panel 208. The limiting head 207 is slidably connected inside the corresponding limiting sliding groove 209. A spline 2010 is arranged on the side surface of the internal ratchet wheel 204 opposite to the housing 5. The spline 2010 is connected to the end of the core shaft assembly extending out of the circular through hole of the frame 1.

[0043] The worm gear on the transmission rod 41 is in transmission connection with the worm on the transmission end of the motor 3. The worm on the transmission rod 41 is in transmission connection with the guiding worm gear 201.

[0044] Wherein, a limiting piece 206 for limiting the movement range of the first pawl 202 is further arranged on the blocking disc 203.

[0045] Wherein, the transmission rod 41 and the fixing member 42 are connected by a steel rod. A bearing is arranged at the connection between the steel rod and the transmission rod 41.

[0046] The guiding worm gear 201 is the driving wheel. When the guiding worm gear 201 rotates counterclockwise, the limiting head 207 on the first pawl 202 slides along the limiting sliding groove 209 on the guiding worm gear 201, resulting in the first pawl 202 making a circular motion around the fixed seat 205 through its tail end, so as to open outwards. The first pawl 202 is embedded into the ratchet teeth of the internal ratchet wheel 204, driving the internal ratchet wheel 204 to rotate. The internal ratchet wheel 204 drives the core shaft assembly to rotate forward to wind back the webbing through the spline 2010. When pulling out the webbing, the core shaft assembly rotates reversely to drive the internal ratchet wheel 204 to rotate reversely. The ratchet teeth of the internal ratchet wheel 204 push the first pawl 202 back to its original position, thus disconnecting the connection with the first pawl 202 and not hindering the pulling out of the webbing.

[0047] Among them, the locking component includes a vehicle sensing housing 8, a pendulum wheel component 9, a vehicle sensing component 10, and an accident locking shaft head 11; the accident locking shaft head 11 is arranged in a circular through hole with internal ratchet teeth on the frame 1 and is in transmission connection with the core shaft component; the pendulum wheel component 9 is in transmission connection with the accident locking shaft head 11, the vehicle sensing housing 8 is connected to one side of the circular through hole with internal ratchet teeth on the frame 1 and covers the pendulum wheel component 9; a vehicle sensing component 10 for limiting the pendulum wheel component 9 when a large acceleration occurs is also arranged in the vehicle sensing housing 8.

[0048] As Figure 7 , Figure 8 shown, the accident locking shaft head 11 is composed of a shaft head 1111, a snap ring 1112, a torsion spring 1113, and a second pawl 1114. The shaft head 1111 is connected to one end of the core shaft component far from the clutch 2. A fixed base is arranged on the side of the shaft head 1111 opposite to the core shaft component. The fixed base is not at the center of the shaft head 1111. The tail end of the second pawl 1114 is movably connected to the fixed base. A limiting column is arranged on the side of the second pawl 1114 opposite to the shaft head 1111. The center of the shaft head 1111 is connected to the core shaft component. A torsion spring 1113 for pressing against the limiting column is also arranged on the shaft head 1111.

[0049] Among them, the shaft head 1111 and the core shaft component are connected by a pin.

[0050] After the accident locking shaft head 11 is actuated by the pendulum wheel component 9 or the vehicle sensing component 10, that is, when the outer ratchet disc 91 stops rotating, since a limiting column on the second pawl 1114 is inserted into the V-shaped limiting chute 95 on the outer ratchet disc 91, when the outer ratchet disc 91 is locked and the webbing is continuously pulled to drive the core shaft component to rotate, the second pawl 1114 will extend under the guidance of the limiting column in the V-shaped limiting chute 95 and the torsion spring 1113 will deform, engaging with the internal ratchet teeth in the circular through hole on the frame 1 to prevent the core shaft component from rotating. If the webbing is retracted later and the core shaft component rotates in reverse, the engagement between the second pawl 1114 and the internal ratchet teeth in the circular through hole on the frame 1 is released, and due to the action of the torsion spring 1113, the second pawl 1114 returns to its initial position; if the webbing continues to be pulled out due to an external force in the locked state and the core shaft component continues to rotate forward, when this external force reaches a certain value, the pin inserted into the shaft head 1111 on the core shaft component will be sheared off, causing torsion, so that the core shaft component continues to rotate by a certain angle.

[0051] As Figure 9As shown, the balance wheel assembly 9 consists of an outer ratchet 91, a special-shaped locking pawl 92, a small compression spring 93, a sleeve 94, a V-shaped limiting groove 95 and a limiting ratchet 96; the outer ratchet 91 is provided with a sleeve 94 at the center of a circle of a side opposite to the accident locking shaft head 11, a spring fixing seat is provided on the arc surface of the sleeve 94, a small compression spring 93 is provided on the spring fixing seat, the outer ratchet 91 is provided with a boss on the side opposite to the accident locking shaft head 11, the special-shaped locking pawl 92 is movably arranged on the boss, the outer ratchet 91 is also provided with a limiting ratchet 96 for limiting the special-shaped locking pawl 92 on the side opposite to the accident locking shaft head 11, the outer ratchet 91 is provided with a V-shaped limiting groove 95 used to cooperate with the limiting column of the second pawl 1114, and the limiting column of the second pawl 1114 is slidably connected in the V-shaped limiting groove 95.

[0052] When the webbing is pulled out at a smaller acceleration, the small compression spring 93 supports the special-shaped locking pawl 92, making it impossible for the special-shaped locking pawl 92 to engage with the limiting ratchet 96 in the outer ratchet disk 91; when the webbing is pulled out at a larger acceleration, the small compression spring 93 contracts due to the larger centrifugal force, and the special-shaped locking pawl 92 rotates and engages with the limiting ratchet 96 in the outer ratchet disk 91, thereby stopping its own rotation and completing the locking of the core shaft 12 through the accident locking shaft head 11.

[0053] like Figure 10 As shown, the vehicle sensing component 10 consists of a vehicle sensing base frame 1011, a ball holder 1012, a small ball 1013 and a locking ball cover 1014; the vehicle sensing base frame 1011 is arranged in the vehicle sensing housing 8 and is at the bottom of the outer ratchet disk 91, the vehicle sensing base frame 1011 is embedded with a ball holder 1012, a small ball 1013 is placed in the ball holder 1012, one end of the locking ball cover 1014 is movably connected to the vehicle sensing base frame 1011 and can be translated up and down, and the locking ball cover 1014 is horizontally above the small ball 1013; a limited clamping rod is arranged on the top of the locking ball cover 1014, and the limited clamping rod is facing the bottom of the outer ratchet disk 91; the inner sides of the ball holder 1012 and the locking ball cover 1014 are both arc-shaped concave surfaces.

[0054] When the vehicle has a large acceleration in a certain direction, such as braking, accelerating, making a sharp turn, or rolling over, the ball 1013 will roll in the ball holder 1012. When the acceleration reaches a certain value, that is, the rolling degree of the ball 1013 reaches a certain amplitude, the locking ball cover 1014 will be lifted up by the ball 1013 and engage with the outer ratchet disk 91 of the balance wheel assembly 9, thereby clamping the outer ratchet disk 91 and preventing the webbing from being pulled out further.

[0055] Among them, the mandrel assembly is composed of a mandrel 12 and a force-limiting shaft 15. The mandrel 12 is movably arranged in the frame 1. One end of the mandrel 12 is connected to one end of the force-limiting shaft 15, and the other end of the force-limiting shaft 15 is connected to the shaft head 1111. The end of the mandrel 12 opposite to the force-limiting shaft 15 is connected to a spline 2010 and then connected to a spring assembly 7 through a shaft extension member 14.

[0056] During a frontal collision when the vehicle encounters an accident, both ends of the mandrel assembly will be completely locked and unable to rotate. However, when the force reaches a certain value, the locking assembly releases the lock. Since one end of the force-limiting shaft 15 is fixed to the mandrel 12, the other end of the force-limiting shaft 15 will be twisted and thus undergo torsional deformation to cause the mandrel 12 to rotate, enabling the webbing to continue to extend a small section to protect the occupant's chest from being injured by excessive force.

[0057] As Figure 11 shown, a disc top 13 is provided between the spline 2010 and the blocking disc 203 to prevent the mandrel 12 from directly contacting and rubbing against the blocking disc 203 during rotation, which may cause the blocking disc 203 to drive the mandrel 12 to rotate.

[0058] Among them, it also includes a control component housing 6 provided on the housing 5. A groove for the movement of the shaft extension member 14 is provided between the housing 5 and the control component housing 6, and the shaft extension member 14 is arranged in the groove; through holes for both ends of the shaft extension member 14 to pass through are provided on both the housing 5 and the control component housing 6.

[0059] Among them, the spring assembly 7 is arranged on the control component housing 6. One end of the shaft extension member 14 passes through the through hole on the housing 5 and is connected to the mandrel 12, and the other end of the shaft extension member 14 passes through the through hole on the control component housing 6 and is connected to the spring assembly 7; since the length of the mandrel 12 is not enough to cooperate with the spring assembly 7, a shaft extension member 14 is added between these two components.

[0060] As Figure 12 shown, the spring assembly 7 is composed of a cover plate 71, a spring 72, and a core head 73. The cover plate 71 is arranged on the control component housing 6. A spring 72 is arranged inside the cover plate 71. The center of the spring 72 is connected to a core head 73, and the core head 73 is connected to the shaft extension member 14.

[0061] When the mandrel 12 rotates to drive the shaft extension member 14 to rotate, the spring 72 has greater deformation energy. When the mandrel 12 is released, the spring 72 releases the deformation energy, driving the mandrel 12 to reverse and reset and retracting the webbing.

[0062] As Figure 13As shown in the figure, two positioning slots 101, a buckle 102 and a positioning opening 103 are also provided on the frame 1; different webbing limit openings can be assembled through the two positioning slots 101 provided (different vehicle models require different webbing pulling angles and heights), the active pre-tensioning force-limiting seat belt can be snapped into the opening of the vehicle B-pillar through the buckle 102 provided, reducing the lateral freedom degree of the active pre-tensioning force-limiting seat belt, and the active pre-tensioning force-limiting seat belt can be installed through the positioning opening 103 provided.

Claims

1. An active pre-tensioning and force-limiting seat belt for an improved clutch, characterized in that, Comprising: A frame, circular through-holes are respectively arranged on both sides of the frame, and internal ratchets are arranged in the circular through-holes on one side; a mandrel assembly is arranged inside the frame, and both ends thereof extend out of both sides of the frame; a clutch is connected to the end of the mandrel assembly extending out of the side of the frame away from the internal ratchet, and a locking assembly is arranged on the other side, and the locking assembly is connected to the mandrel assembly; a motor is arranged on the frame; a transmission assembly is arranged on the side of the frame away from the internal ratchet, and the transmission assembly is respectively in transmission connection with the clutch and the motor; a housing for protecting the transmission assembly is further arranged on the side of the frame away from the internal ratchet, and a spring winding assembly is arranged on the housing, and the spring winding assembly is connected to the mandrel assembly; The locking assembly includes a vehicle sensing housing, a pendulum wheel assembly, a vehicle sensing assembly and an accident locking shaft head. The accident locking shaft head is arranged in the circular through-hole of the frame with the internal ratchet and is in transmission connection with the mandrel assembly. The pendulum wheel assembly is in transmission connection with the accident locking shaft head. The vehicle sensing housing covers the pendulum wheel assembly and is arranged on the side of the frame with the internal ratchet. A vehicle sensing assembly is arranged inside the vehicle sensing housing for limiting the pendulum wheel assembly in special cases; The clutch includes a guiding worm wheel, a first pawl, a blocking disc and an internal ratchet. The guiding worm wheel is a hollow structure with openings on both sides, and the internal ratchet is movably sleeved inside it. A blocking disc is movably arranged inside the internal ratchet. Fixed seats are symmetrically arranged on the inner side surface of the blocking disc. The tail end of the first pawl is movably arranged on the fixed seat and can rotate around it. A limiting head is arranged on the first pawl; a limiting panel is arranged at the opening of the guiding worm wheel close to the housing, and a limiting sliding groove for cooperating with the first pawl is arranged on the limiting panel, and the limiting head is slidably connected in the limiting sliding groove; splines are arranged on the side surface of the internal ratchet away from the housing, and the splines are connected to the end of the mandrel assembly extending out of the frame.

2. An active pre-tensioning force-limiting seat belt for an improved clutch according to claim 1, characterized in that: The accident locking shaft head is composed of a shaft head, a snap spring piece, a torsion spring and a second pawl. The shaft head is connected to the end of the mandrel assembly away from the clutch. A fixed base is arranged on the side of the shaft head opposite to the mandrel assembly, and the fixed base is not at the center of the shaft head. The tail end of the second pawl is movably connected to the fixed base, and a limiting post is arranged on the side of the second pawl opposite to the shaft head; the center of the shaft head is connected to the mandrel assembly; a torsion spring for pressing against the limiting post is further arranged on the shaft head.

3. An active pre-tightening force-limiting seat belt for an improved clutch according to claim 2, characterized in that: The pendulum wheel assembly is composed of an external ratchet disc, a special-shaped locking pawl, a small compression spring, a sleeve, a V-shaped limiting sliding groove and a limiting ratchet tooth; a sleeve is arranged at the center of the side of the external ratchet disc opposite to the accident locking shaft head. A spring fixing seat is arranged on the arc surface of the sleeve, and a small compression spring is arranged on the spring fixing seat. A convex platform is arranged on the side of the external ratchet disc opposite to the accident locking shaft head. The special-shaped locking pawl is movably arranged on the convex platform. A limiting ratchet tooth for limiting the special-shaped locking pawl is further arranged on the side of the external ratchet disc opposite to the accident locking shaft head. A V-shaped limiting sliding groove for cooperating with the limiting post of the second pawl is arranged on the external ratchet disc, and the limiting post of the second pawl is slidably connected in the V-shaped limiting sliding groove.

4. An active pre-tensioning force-limiting seat belt for an improved clutch according to claim 3, characterized in that: The vehicle sensing component is composed of a vehicle sensing base frame, a ball support, a small ball, and a locking ball cover; the vehicle sensing base frame is arranged inside the vehicle sensing housing and is at the bottom of the outer ratchet disc. The vehicle sensing base frame is embedded with a ball support, and a small ball is placed inside the ball support. One end of the locking ball cover is movably connected to the vehicle sensing base frame, and the locking ball cover is horizontally above the small ball; a limiting clamping rod is arranged at the top of the locking ball cover, and the limiting clamping rod faces the bottom of the outer ratchet disc; the inner sides of the ball support and the locking ball cover are both arc-shaped concave surfaces.

5. An active pre-tightening force-limiting seat belt for an improved clutch according to claim 4, characterized in that: The mandrel component is composed of a mandrel and a force-limiting shaft. The mandrel is movably arranged inside the frame. One end of the mandrel is connected to one end of the force-limiting shaft, and the other end of the force-limiting shaft is connected to the shaft head. The end of the mandrel opposite to the force-limiting shaft is connected to a spline and then connected to a spring assembly through a shaft extension.

6. An actively pre-tensioned force-limiting seat belt for an improved clutch according to claim 5, characterized in that: It further includes a control component housing arranged on the housing. A groove for the shaft extension to move is arranged between the housing and the control component housing, and the shaft extension is arranged inside the groove; through holes for both ends of the shaft extension to pass through are arranged on both the housing and the control component housing; the spring assembly is arranged on the control component housing. One end of the shaft extension passes through the through hole on the housing and is connected to the mandrel, and the other end of the shaft extension passes through the through hole on the control component housing and is connected to the spring assembly.

7. An active pre-tensioning force-limiting seat belt for an improved clutch according to claim 6, characterized in that: The transmission component is composed of a transmission rod and a fixing part; the transmission rod is connected to one side of the clutch on the frame through fixing parts movably connected at both ends; worm wheels and worms are respectively arranged at both ends of the transmission rod; the worm wheel on the transmission rod is in transmission connection with the worm on the motor transmission end head, and the worm on the transmission rod is in transmission connection with the guiding worm wheel.

8. An active pre-tensioning and force-limiting seat belt for an improved clutch according to claim 7, characterized in that: A limiting piece for restricting the movement range of the first pawl is further arranged on the blocking disc.

9. An active pre-tightening force-limiting seat belt for an improved clutch according to claim 8, characterized in that: A disc top is arranged between the spline and the blocking disc.

Images