An active pre-tightening force-limiting safety belt with improved clutch

Abstract

The present invention discloses an active pre-tensioning and force-limiting safety belt with an improved clutch, comprising: a frame; a core shaft assembly for connecting and winding a webbing; a clutch for realizing forward and reverse rotation of the core shaft assembly; a locking assembly for limiting and locking the core shaft assembly in an emergency; a motor, which is arranged on the frame; a transmission assembly, which is arranged on the frame and is respectively connected to the clutch and the motor for transmission between the motor and the clutch; a housing, which is sleeved on the surface of the transmission assembly for protecting the transmission assembly; a coil spring assembly, which is arranged on the housing and connected to the core shaft assembly for resetting the core shaft assembly; the present invention provides an inner ratchet clutch, which makes the overall transmission response time of the active pre-tensioning and force-limiting safety belt shorter than that of a traditional outer ratchet clutch; the locking assembly enables the active pre-tensioning and force-limiting safety belt to be locked in time in an emergency.

Description

Technical Field

[0001] The present invention relates to the technical field of active pre-tightening safety belts, in particular to an active pre-tightening force-limiting safety belt with an improved clutch. Background Art

[0002] Traditional seat belts cannot achieve humanized functions, and are not equipped with force limiters, which does not provide sufficient protection for the human chest. Therefore, the safety of traditional seat belts is worse than active pre-tensioned seat belts. Active pre-tensioned seat belts are a kind of automobile safety device that integrates active safety technology and passive safety technology. They can actively pre-tighten the seat belts before a collision and restrain the driver and passengers in advance, thereby significantly improving the safety of the vehicle.

[0003] Active pretensioner seatbelts work in conjunction with the vehicle's active safety systems (such as Automatic Emergency Braking (AEB)) to receive vehicle danger signals. When vehicle sensors detect a potential collision, the seatbelt's active pretensioner activates rapidly, tightening the belt via a motor or explosive pretensioner, eliminating the gap between the belt and the occupant and restraining them in the seat. Before a collision occurs, active pretensioner seatbelts can correct an out-of-position sitting position, placing the occupant in a safer position and minimizing injuries.

[0004] At present, the active pre-tensioned seat belts known on the market have a long response time and use more parts. Active pre-tensioned seat belts are generally used in high-end motor vehicles and will later become popular in better pure electric vehicles. The large number of parts can easily cause louder noise during operation, lowering the quality of high-end motor vehicles. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an active pre-tightening force-limiting safety belt with an improved clutch, the purpose of which is to solve the problems in the background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an active pre-tensioning force-limiting safety belt with an improved clutch, comprising: a frame, circular through holes are respectively provided on both sides of the frame, wherein an inner ratchet is provided in the circular through hole on one side; a core shaft assembly is provided in the frame, and its two ends extend out of the two sides of the frame; the end of the core shaft assembly extending from the side of the frame away from the inner ratchet is connected to the 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 inner ratchet, and the transmission assembly is respectively connected to the clutch and the motor; a shell is further provided on the side of the frame away from the inner ratchet for protecting the transmission assembly, and a coil spring assembly is provided on the shell, and the coil spring assembly is connected to the core shaft assembly;

[0007] The locking assembly includes a vehicle sensing housing, a balance wheel assembly, a vehicle sensing assembly and an emergency locking shaft head. The emergency locking shaft head is arranged in a circular through hole of the ratchet in the frame belt and is transmission-connected to the core shaft assembly. The balance wheel assembly is transmission-connected to the emergency locking shaft head. The vehicle sensing housing covers the balance wheel assembly and is arranged on one side of the ratchet in the frame belt. The vehicle sensing housing is provided with a vehicle sensing assembly for limiting the balance wheel assembly in special circumstances.

[0008] The clutch includes a guide worm gear, a first pawl, a blocking disc and an inner ratchet. The guide worm gear is a hollow structure with openings on both sides, in which an inner ratchet is movably mounted. A blocking disc is movably mounted inside the inner ratchet, and a fixed seat is symmetrically provided on the inner side surface of the blocking disc. The tail end of the first pawl is movably mounted on the fixed seat and can rotate around it, and a limiting head is provided on the first pawl; a limiting panel is provided at the opening of the guide worm gear close to the outer shell, and a limiting groove is provided on the limiting panel to cooperate with the first pawl, and the limiting head is slidably connected to the limiting groove; a spline is provided on the side of the inner ratchet away from the outer shell, and the spline is connected to the end of the core shaft assembly extending out of the frame.

[0009] Furthermore, the accident locking shaft head is composed of a shaft head, a retaining spring, a torsion spring and a second pawl. The shaft head is connected to the end of the core shaft assembly away from the clutch. The shaft head is provided with a fixed base on the opposite side of 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. The second pawl is provided with a limiting column on the opposite side of the shaft head; the center of the shaft head is connected to the core shaft assembly; and the shaft head is also provided with a torsion spring for tightening the limiting column.

[0010] Furthermore, the balance wheel assembly consists of an outer ratchet, a special-shaped locking pawl, a small compression spring, a sleeve, a V-shaped limiting groove and a limiting ratchet; the outer ratchet is provided with a sleeve at the center of the circle of the side opposite to the accident locking shaft head, a spring fixing seat is provided on the arc surface of the sleeve, a small compression spring is provided on the spring fixing seat, the outer ratchet is provided with a boss on the side opposite to the accident locking shaft head, the special-shaped locking pawl is movably provided on the boss, the outer ratchet is also provided with a limiting ratchet for limiting the special-shaped locking pawl on the side opposite to the accident locking shaft head, a V-shaped limiting groove is provided on the outer ratchet for cooperating with the limiting column of the second pawl, and the limiting column of the second pawl is slidably connected in the V-shaped limiting groove.

[0011] Furthermore, the vehicle sensing assembly consists of a vehicle sensing base, a ball holder, a small ball and a locking ball cover; the vehicle sensing base is arranged in the vehicle sensing outer shell and is at the bottom of the outer ratchet disk, the vehicle sensing base is embedded with a ball holder, and the small ball is placed in the ball holder, one end of the locking ball cover is movably connected to the vehicle sensing base, and the locking ball cover is horizontally above the small ball; a limit clamping rod is provided on the top of the locking ball cover, and the limit clamping rod is facing the bottom of the outer ratchet disk; the inner sides of the ball holder and the locking ball cover are both arc-shaped concave surfaces.

[0012] Furthermore, the core shaft assembly consists of a core shaft and a force-limiting shaft. The core shaft is movably arranged in the frame, one end of the core shaft 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 core shaft opposite to the force-limiting shaft is connected to the spline and then connected to the coil spring assembly through the shaft extension.

[0013] Furthermore, it also includes a control component housing arranged on the outer shell, a groove for the movement of the extension part is provided between the outer shell and the control component housing, and the extension part is provided in the groove; the outer shell and the control component housing are both provided with through holes for the two ends of the extension part to pass through; the coil spring assembly is arranged on the control component housing, one end of the extension part passes through the through hole on the outer shell to connect to the core shaft, and the other end of the extension part passes through the through hole on the control component housing to connect to the coil spring assembly.

[0014] Furthermore, the transmission assembly consists of a transmission rod and a fixing part; the transmission rod is connected to the frame on one side of the clutch through fixing parts movably connected at both ends; a worm wheel and a worm are respectively provided at both ends of the transmission rod; the worm wheel on the transmission rod is connected to the worm provided on the transmission end of the motor, and the worm on the transmission rod is connected to the guide worm wheel.

[0015] Furthermore, the blocking disc is also provided with a limiting piece for limiting the movement range of the first pawl.

[0016] Furthermore, a disc top is provided between the spline and the blocking disc.

[0017] Compared with the existing technology, the present invention has the following beneficial effects:

[0018] (1) The present invention provides an internal ratchet clutch, which shortens the overall transmission response time of the active preload-limiting safety belt compared to the traditional external ratchet clutch, providing the active preload-limiting safety belt with more abundant response time, thereby improving the overall reliability; the locking assembly allows the active preload-limiting safety belt to be locked in time in an emergency.

[0019] (2) The present invention provides an internal ratchet clutch, which is smaller in size, lighter in weight and more compact in structure than a traditional clutch. This reduces the overall volume and mass of the safety belt, saves space in the vehicle and is more convenient to install. In addition, when the clutch is operating normally, collision only occurs when the ratchet and pawl are engaged, resulting in small vibration amplitude and low noise, which improves the driver's driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is an exploded view of the overall structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the connection structure of the transmission assembly, motor and clutch of the present invention.

[0023] Figure 4 It is an exploded front view of the clutch of the present invention.

[0024] Figure 5 It is an exploded view of the reverse side of the clutch of the present invention.

[0025] Figure 6 Schematic diagram of the blocking disc structure of the present invention.

[0026] Figure 7 This is a schematic diagram of the accident locking shaft head structure of the present invention.

[0027] Figure 8 It is a schematic diagram of the internal structure of the accident locking shaft head of the present invention.

[0028] Figure 9 Schematic diagram of the balance wheel assembly structure of the present invention.

[0029] Figure 10 This is a schematic structural diagram of the vehicle sensing component of the present invention.

[0030] Figure 11 It is a schematic diagram of the disk top connection structure of the present invention.

[0031] Figure 12 It is a schematic structural diagram of the coil spring assembly of the present invention.

[0032] Figure 13 It is a schematic diagram of the framework structure of the present invention.

[0033] In the figure, 1. frame; 101. positioning groove; 102. buckle; 103. positioning opening; 2. clutch; 201. guide worm gear; 202. first pawl; 203. blocking disc; 204. inner ratchet; 205. fixing seat; 206. limiting plate; 207. limiting head; 208. limiting panel; 209. limiting slide; 2010. spline; 3. motor; 4. transmission assembly; 41. transmission rod; 42. fixing member; 5. housing; 6. control assembly housing; 7. coil spring assembly; 71. cover plate; 72. coil spring; 7 3. Core head; 8. Vehicle sensor housing; 9. Balance wheel assembly; 91. Outer ratchet; 92. Special-shaped locking pawl; 93. Small compression spring; 94. Sleeve; 95. V-shaped limit slide; 96. Limit ratchet; 10. Vehicle sensor assembly; 1011. Vehicle sensor base; 1012. Ball holder; 1013. Small ball; 1014. Locking ball cover; 11. Emergency locking shaft head; 1111. Shaft head; 1112. Reed clip; 1113. Torsion spring; 1114. Second pawl; 12. Core shaft; 13. Disc top; 14. Shaft extension; 15. Force-limiting shaft. DETAILED DESCRIPTION

[0034] like Figure 1 、 Figure 2 As shown, the present invention provides a technical solution: an active pre-tightening force-limiting safety belt with an improved clutch, comprising:

[0035] The frame 1 has circular through holes on both sides thereof, and an inner ratchet is provided in the circular through hole on one side.

[0036] The core shaft assembly is arranged in the frame 1, and its two ends extend out of the two sides of the frame 1 through circular through holes, and is used for connecting and winding the webbing.

[0037] The clutch 2 is mounted on the end of the core shaft assembly extending away from the inner ratchet side of the frame 1, and is used to realize the forward and reverse rotation of the core shaft assembly.

[0038] The locking assembly is arranged on a side of the frame 1 away from the clutch 2 and is connected to the core shaft assembly, and is used to limit and lock the core shaft assembly in an emergency.

[0039] The motor 3 is arranged on the frame 1 .

[0040] The transmission assembly 4 is arranged on the side of the frame 1 away from the inner ratchet and is respectively connected to the clutch 2 and the motor 3 for transmission between the motor 3 and the clutch 2.

[0041] The housing 5 is arranged on a side of the frame 1 away from the inner ratchet and is used to protect the transmission component 4.

[0042] The coil spring assembly 7 is provided on the housing 5 and connected to the core shaft assembly for resetting the core shaft assembly.

[0043] like Figure 3 As shown, the transmission assembly 4 consists of a transmission rod 41 and a fixing member 42; the transmission rod 41 is connected to the frame 1 on one side of the clutch 2 through the fixing member 42 movably connected at both ends; a worm wheel and a worm are respectively provided at both ends of the transmission rod 41.

[0044] like Figure 4-Figure 6As shown, the clutch 2 includes a guide worm wheel 201, a first pawl 202, a blocking disc 203 and an inner ratchet 204; the guide worm wheel 201 is hollow inside and open on both sides, the guide worm wheel 201 is movably provided with an inner ratchet 204, the inner ratchet 204 is movably provided with a blocking disc 203, and a fixed seat 205 is axially symmetrically provided on the inner side surface of the blocking disc 203, the tail end of the first pawl 202 is movably provided on the fixed seat 205, and the first pawl 202 is moved around the fixed seat 205 by the tail end 5 makes circular motion; a limit head 207 is also provided on the first pawl 202; a limit panel 208 is provided on the opening of the guide worm gear 201 on one side of the housing 5, and a limit slot 209 is provided on the limit panel 208 for cooperating with the first pawl 202, and the limit head 207 is slidably connected in the corresponding limit slot 209; the inner ratchet 204 is provided with a spline 2010 on the side opposite to the housing 5, and the spline 2010 is connected to the end of the core shaft assembly extending out of the circular through hole of the frame 1.

[0045] The worm wheel on the transmission rod 41 is in transmission connection with the worm provided on the transmission end of the motor 3 , and the worm on the transmission rod 41 is in transmission connection with the guide worm wheel 201 .

[0046] The blocking disc 203 is further provided with a limiting piece 206 for limiting the movement range of the first pawl 202 .

[0047] The transmission rod 41 and the fixing member 42 are connected via a steel rod, and a bearing is provided at the connection between the steel rod and the transmission rod 41 .

[0048] The guide worm gear 201 is the driving wheel. When the guide worm gear 201 rotates counterclockwise, the limit head 207 on the first pawl 202 slides along the limit slot 209 on the guide worm gear 201, causing the first pawl 202 to make a circular motion around the fixed seat 205 through the tail end, thereby opening outward, and the first pawl 202 is embedded in the ratchet teeth of the inner ratchet 204, driving the inner ratchet 204 to rotate, and the inner ratchet 204 drives the core shaft assembly to rotate forward through the spline 2010 to recycle the webbing; when pulling out the webbing, the core shaft assembly reverses and drives the inner ratchet 204 to reverse, and the ratchet teeth of the inner ratchet 204 push the first pawl 202 back to its original position, thereby disconnecting from the first pawl 202 and not hindering the pulling out of the webbing.

[0049] Among them, the locking assembly includes a vehicle sensing housing 8, a balance wheel assembly 9, a vehicle sensing assembly 10 and an accident locking shaft head 11; the accident locking shaft head 11 is arranged in a circular through hole with an internal ratchet on the frame 1 and is transmission-connected to the core shaft assembly; the balance wheel assembly 9 and the accident locking shaft head 11 are transmission-connected, the vehicle sensing housing 8 is connected to one side of the circular through hole with an internal ratchet on the frame 1, and covers the balance wheel assembly 9; a vehicle sensing assembly 10 is also provided in the vehicle sensing housing 8 for limiting the balance wheel assembly 9 when a large acceleration occurs.

[0050] like Figure 7 、 Figure 8 As shown, the accident locking shaft head 11 is composed of a shaft head 1111, a retaining spring 1112, a torsion spring 1113 and a second pawl 1114. The shaft head 1111 is connected to the end of the core shaft assembly away from the clutch 2. The shaft head 1111 is provided with a fixed base on the opposite side of the core shaft assembly, and 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, and the second pawl 1114 is provided with a limiting column on the opposite side of the shaft head 1111; the center of the shaft head 1111 is connected to the core shaft assembly; the shaft head 1111 is also provided with a torsion spring 1113 for tightening the limiting column.

[0051] The shaft head 1111 and the core shaft assembly are connected by pins.

[0052] The accident locking shaft head 11 is when the outer ratchet 91 stops rotating after the balance wheel assembly 9 or the vehicle sensing assembly 10 acts. Since there is a limiting column on the second ratchet 1114 which is inserted into the V-shaped limiting groove 95 on the outer ratchet 91, when the outer ratchet 91 is locked, the webbing is continued to be pulled to drive the core shaft assembly to rotate. The second ratchet 1114 will extend through the limiting column under the guidance of the V-shaped limiting groove 95 and the torsion spring 1113 will be deformed, engaging with the inner ratchet in the circular through hole on the frame 1 to prevent the core shaft assembly from rotating. If the webbing is subsequently recovered and the core shaft assembly is reversed, the second pawl 1114 is released from engagement with the internal ratchet in the circular through hole on the frame 1, and then 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 external force in the locked state, the core shaft assembly continues to rotate forward, and when this external force reaches a certain value, the pin of the core shaft assembly inserted into the shaft head 1111 will be sheared off, causing twisting, thereby causing the core shaft assembly to continue to rotate a certain angle.

[0053] like 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 the circle of the side opposite to the accident locking shaft head 11, and a spring fixing seat is provided on the arc surface of the sleeve 94, and 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, and the special-shaped locking pawl 92 is movably provided 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 for cooperating 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.

[0054] When the webbing is pulled out with a smaller acceleration, the small compression spring 93 presses against 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 with 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.

[0055] 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, and the 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 provided 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.

[0056] 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.

[0057] Among them, the core shaft assembly consists of a core shaft 12 and a force-limiting shaft 15. The core shaft 12 is movably arranged in the frame 1. One end of the core shaft 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 core shaft 12 opposite to the force-limiting shaft 15 is connected to the spline 2010 and then connected to the coil spring assembly 7 through the shaft extension 14.

[0058] During a head-on collision, both ends of the core shaft assembly will be completely locked and unable to rotate. However, when the force reaches a certain value, the locking assembly will be unlocked. Since one end of the force-limiting shaft 15 is fixed to the core shaft 12, the other end of the force-limiting shaft 15 will be twisted and deformed, thereby rotating the core shaft 12. This allows the webbing to continue to extend a short distance, protecting the occupant's chest from being injured by excessive force.

[0059] like Figure 11 As shown, a disc top 13 is provided between the spline 2010 and the blocking disc 203 to prevent the core shaft 12 from directly contacting and rubbing against the blocking disc 203 during rotation, thereby preventing the blocking disc 203 from driving the core shaft 12 to rotate.

[0060] It also includes a control component housing 6 arranged on the housing 5, and a groove for the movement of the shaft extension part 14 is provided between the housing 5 and the control component housing 6, and the shaft extension part 14 is provided in the groove; the housing 5 and the control component housing 6 are both provided with through holes for the two ends of the shaft extension part 14 to pass through.

[0061] Among them, the coil spring assembly 7 is arranged on the control assembly housing 6, one end of the axial extension 14 passes through the through hole on the housing 5 to connect to the core shaft 12, and the other end of the axial extension 14 passes through the through hole on the control assembly housing 6 to connect to the coil spring assembly 7; since the length of the core shaft 12 is not enough to cooperate with the coil spring assembly 7, an axial extension 14 is added between the two components.

[0062] like Figure 12 As shown, the coil spring assembly 7 consists of a cover plate 71, a coil spring 72 and a core head 73. The cover plate 71 is arranged on the control component housing 6. The coil spring 72 is arranged in the cover plate 71. The core head 73 is connected to the center of the coil spring 72. The core head 73 is connected to the shaft extension 14.

[0063] When the core shaft 12 rotates, the shaft extension 14 rotates, so that the coil spring 72 has a larger deformation energy. When the core shaft 12 is loosened, the coil spring 72 releases the deformation energy, drives the core shaft 12 to reverse and reset and retract the webbing.

[0064] like Figure 13As shown, the frame 1 is further provided with two positioning grooves 101, a buckle 102 and a positioning opening 103; different webbing limit openings can be assembled through the two positioning grooves 101 (different models require different webbing pull-out angles and heights), and the active pre-tensioned force-limiting seat belt can be clamped into the opening of the vehicle's B-pillar through the buckle 102, reducing the lateral freedom of the active pre-tensioned force-limiting seat belt, and the active pre-tensioned force-limiting seat belt can be installed through the positioning opening 103.

Claims

1. An active pre-tightening force-limiting safety belt with an improved clutch, characterized in that: include: A frame, wherein circular through holes are respectively provided on both sides of the frame, and an internal ratchet is provided in the circular through hole on one side; a core shaft assembly is provided in the frame, and its two ends extend out of the two sides of the frame; the end of the core shaft assembly extending from the side of the frame 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 connected to the clutch and the motor; a shell is also provided on the side of the frame away from the internal ratchet for protecting the transmission assembly, and a coil spring assembly is provided on the shell, and the coil spring assembly is connected to the core shaft assembly; The locking assembly includes a vehicle sensor housing, a balance wheel assembly, a vehicle sensor assembly and an emergency locking shaft head. The emergency locking shaft head is arranged in a circular through hole of the ratchet in the frame belt and is transmission-connected to the core shaft assembly. The balance wheel assembly is transmission-connected to the emergency locking shaft head. The vehicle sensor housing covers the balance wheel assembly and is arranged on one side of the ratchet in the frame belt. The vehicle sensor housing is provided with a vehicle sensor assembly for limiting the balance wheel assembly. The clutch includes a guide worm gear, a first pawl, a blocking disc and an inner ratchet, the guide worm gear is a hollow structure with openings on both sides, an inner ratchet is movably sleeved therein, a blocking disc is movably provided in the inner ratchet, a fixed seat is symmetrically provided on the inner side surface of the blocking disc, the tail end of the first pawl is movably provided on the fixed seat and can rotate around it, and a limiting head is provided on the first pawl; a limiting panel is provided at the opening of the guide worm gear close to the outer shell, the limiting panel is provided with a limiting slot cooperating with the first pawl, and the limiting head is slidably connected to the limiting slot; a spline is provided on the side of the inner ratchet away from the outer shell, and the spline is connected to the end of the core shaft assembly extending out of the frame; The accident locking shaft head is composed of a shaft head, a retaining spring, a torsion spring and a second pawl. The shaft head is connected to the end of the core shaft assembly away from the clutch. The shaft head is provided with a fixed base on the side 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. The second pawl is provided with a limiting column on the side opposite to the shaft head. The center of the shaft head is connected to the core shaft assembly. The shaft head is also provided with a torsion spring for tightening the limiting column. The balance wheel assembly consists of an outer ratchet, a special-shaped locking pawl, a small compression spring, a sleeve, a V-shaped limiting slide and a limiting ratchet; the outer ratchet is provided with a sleeve at the center of a circle of a side opposite to the accident locking shaft head, a spring fixing seat is provided on the arc surface of the sleeve, a small compression spring is provided on the spring fixing seat, the outer ratchet is provided with a boss on the side opposite to the accident locking shaft head, the special-shaped locking pawl is movably provided on the boss, the outer ratchet is also provided with a limiting ratchet for limiting the special-shaped locking pawl on the side opposite to the accident locking shaft head, a V-shaped limiting slide is provided on the outer ratchet for cooperating with the limiting column of the second pawl, and the limiting column of the second pawl is slidably connected in the V-shaped limiting slide; The vehicle sensing assembly consists of a vehicle sensing base, a ball holder, a small ball and a locking ball cover; the vehicle sensing base is arranged in the vehicle sensing shell and is at the bottom of the outer ratchet disc, the vehicle sensing base is embedded with a ball holder, and the small ball is placed in the ball holder, one end of the locking ball cover is movably connected to the vehicle sensing base, and the locking ball cover is horizontally above the small ball; a limited clamping rod is provided on the top of the locking ball cover, and the limited clamping rod is facing the bottom of the outer ratchet disc; the inner sides of the ball holder and the locking ball cover are both arc-shaped concave surfaces.

2. The active pre-tensioning force-limiting safety belt with an improved clutch according to claim 1, characterized in that: The core shaft assembly consists of a core shaft and a force-limiting shaft. The core shaft is movably arranged in a frame. One end of the core shaft 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 core shaft opposite to the force-limiting shaft is connected to the spline and then connected to the coil spring assembly through the shaft extension.

3. The active pre-tensioning force-limiting safety belt with an improved clutch according to claim 2, characterized in that: It also includes a control component housing arranged on the outer shell, a groove for the movement of the shaft extension is provided between the outer shell and the control component housing, and the shaft extension is provided in the groove; the outer shell and the control component housing are both provided with through holes for the two ends of the shaft extension to pass through; the coil spring assembly is arranged on the control component housing, one end of the shaft extension passes through the through hole on the outer shell to connect to the core shaft, and the other end of the shaft extension passes through the through hole on the control component housing to connect to the coil spring assembly.

4. The active pre-tensioning force-limiting safety belt with an improved clutch according to claim 3, characterized in that: The transmission assembly consists of a transmission rod and a fixing part; the transmission rod is connected to the frame on one side of the clutch through fixing parts that are movably connected at both ends; a worm wheel and a worm are respectively provided at both ends of the transmission rod; the worm wheel on the transmission rod is connected to the worm provided on the transmission end of the motor, and the worm on the transmission rod is connected to the guide worm wheel.

5. The active pre-tensioning force-limiting safety belt with an improved clutch according to claim 4, characterized in that: The blocking disc is also provided with a limiting piece for limiting the movement range of the first pawl.

6. The active pre-tensioning force-limiting safety belt with an improved clutch according to claim 5, characterized in that: A disc top is provided between the spline and the blocking disc.

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