An automotive seat belt pretensioner end piece and an automobile

Abstract

The invention provides an automotive seat belt pretensioner end piece and an automobile. The pretensioner end piece includes a steel wire rope, a leaf spring seat, a piston connecting rod and a steel pipe; the leaf spring seat is sleeved on the piston connecting rod; a claw is arranged on the circumference of the leaf spring seat, and the claw can elastically deform along the radial direction of the leaf spring seat; the piston connecting rod is sleeved on the steel wire rope and can drive the steel wire rope to move in the cavity of the steel pipe, so as to realize the pretensioning action; a clamping groove is arranged on the inner wall of the steel pipe; the leaf spring seat can move together with the piston connecting rod, and the claw is clamped in the clamping groove, so as to limit the movement of the piston connecting rod in a single direction; the solution provided by the invention is convenient to process, simple to assemble, strong in practicability and high in reliability, has strong axial force resistance ability, improves the locking performance of the pretensioner end piece, and further improves the safety driving performance of the automobile.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive seat belt pre-tension end pieces, and particularly relates to an automotive seat belt pre-tension end piece and an automobile. Background Art

[0002] A pre-tension end piece is a product that realizes the retraction of the seat belt webbing when a vehicle collides. It can reduce the pressure borne by passengers in a collision accident. With the continuous development of automotive safety technology in China, the application of pre-tension end pieces is becoming more and more widespread, and pre-tension end pieces can be used to replace ordinary seat belt lower end pieces.

[0003] The working principle of the pre-tension end piece includes: after pre-tensioning is completed, the pre-tension end piece is subjected to a reverse pulling force from the webbing. Due to the inertia of the steel balls, they continue to move forward. The conical surface of the piston forces the steel balls to expand outwards, and finally the steel balls are locked by clamping the inner wall of the steel pipe. The system performance requires that the locking stroke is less than 10 mm. The existing pre-tension end piece locks by forcing the steel balls to clamp the inner wall of the steel pipe through the acting force of the piston conical surface, but it has the problems of instability and large fluctuations in the locking stroke.

[0004] Based on the above technical problems existing in the pre-tension end piece, there is no relevant solution yet. Therefore, it is urgent to seek an effective solution to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies in the above technologies and propose an automotive seat belt pre-tension end piece and an automobile, aiming to solve the problem of unstable locking function of the existing pre-tension end piece.

[0006] The present invention provides an automotive seat belt pre-tension end piece, which includes a steel wire rope, a spring clip seat, a piston connecting rod, and a steel pipe. The spring clip seat is sleeved on the piston connecting rod. Claws are provided on the circumference of the spring clip seat, and the claws can elastically deform along the radial direction of the spring clip seat. The piston connecting rod is sleeved on the steel wire rope and can drive the steel wire rope to move in the cavity of the steel pipe, thereby realizing the pre-tensioning action. A clamping groove is provided on the inner wall of the steel pipe. The spring clip seat can move together with the piston connecting rod and make the claws snap into the clamping groove, thereby restricting the movement of the piston connecting rod in a single direction.

[0007] Further, the pre-tension end piece further includes a steel wire rope clamp. The piston connecting rod includes a central column, which is a hollow structure. A clamp connecting portion is provided at one end of the central column. The clamp connecting portion is riveted to one end of the steel wire rope clamp to form an integral body. The steel wire rope clamp is sleeved on the steel wire rope and can move in the cavity of the steel pipe together with the piston connecting rod. The steel wire rope clamp is used to clamp the steel wire rope.

[0008] Further, a shrapnel socket mounting groove is also provided on the central column. The shrapnel socket further includes a shrapnel body, and the claw is arranged on the circumference of the shrapnel body; the shrapnel body is sleeved on the central column and is located in the shrapnel socket mounting groove; a gap is reserved between the claw and the central column, so that the claw can elastically deform along the radial direction of the central column and can be clamped in the card slot.

[0009] Further, the pre-tightening end piece further includes a piston sealing ring; one end of the central column is provided with a sealing ring mounting groove; the piston sealing ring is sleeved in the sealing ring mounting groove and can move in the cavity of the steel pipe under the push of the piston connecting rod, so as to form a sealed cavity.

[0010] Further, the pre-tightening end piece further includes a joint body and a gas generator; the joint body includes a first interface and a second interface, the first interface is communicated with the gas generator; the second interface is communicated with the sealed cavity of the steel pipe; the gas generator conveys gas into the sealed cavity by receiving an electric signal, and then pushes the piston connecting rod and the wire rope gripper to slide in the cavity of the steel pipe.

[0011] Further, a stop point is also provided on the inner wall of the steel pipe, and the distance between the stop point and the card slot is less than 10 mm; the stop point is used to limit the moving distance of the piston connecting rod and the wire rope gripper in the steel pipe; when the piston connecting rod moves leftward to the first position, the claw is clamped in the card slot, so that the piston connecting rod cannot continue to slide leftward; when the wire rope gripper moves rightward to the second position, the convex ring on the wire rope gripper is limited by the stop point and cannot continue to slide rightward.

[0012] Further, the claw is made of spring steel material; when the piston connecting rod moves in the cavity of the steel pipe, the inner wall of the steel pipe applies a radial pressure to the claw, so that the claw is compressed toward the central column, and then the piston connecting rod moves forward on the inner wall of the steel pipe.

[0013] Further, the gap reserved between the claw and the central column is more than 0.5 mm; and / or, there are three claws, and the three claws are evenly distributed on the circumference of the shrapnel body.

[0014] Further, the card slot is arranged in a circle along the inner wall of the steel pipe; an inclined mouth is formed on one side of the card slot along the axial direction of the steel pipe, so that the claw can be clamped in the card slot in a single direction.

[0015] Correspondingly, the present invention also provides an automobile, including a seat belt pre-tightening end piece, and the seat belt pre-tightening end piece is the seat belt pre-tightening end piece of the automobile described above.

[0016] The present invention provides a seat belt pre-tightening end piece for an automobile, which is convenient to process, simple to assemble, strong in practicability, high in reliability, has strong anti-axial force ability, and at the same time improves the locking performance of the pre-tightening end piece, thereby improving the safe driving performance of the automobile. Description of the Drawings

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] The following will further illustrate the present invention with reference to the accompanying drawings:

[0019] Figure 1 is an exploded view of a pre-tightening end piece of an automobile seat belt according to the present invention;

[0020] Figure 2 is a front view of a shrapnel card seat according to the present invention;

[0021] Figure 3 is Figure 2 a sectional view taken along the direction of A-A;

[0022] Figure 4 is a right view of a shrapnel card seat according to the present invention;

[0023] Figure 5 is a left view of a shrapnel card seat according to the present invention;

[0024] Figure 6 is a schematic structural diagram of a locking assembly according to the present invention (excluding the steel pipe);

[0025] Figure 7 is a partial sectional view of a steel pipe according to the present invention;

[0026] Figure 8 is a schematic structural diagram of a locking assembly according to the present invention;

[0027] Figure 9 is Figure 8 a sectional view taken along the direction of B-B;

[0028] Figure 10 is a schematic structural diagram of a piston connecting rod according to the present invention.

[0029] In the figure: 1 - end piece; 2 - heat shrinkable tube; 3 - steel wire rope; 4 - support plate; 5 - body; 6 - gas generator; 7 - shrapnel card seat; 8 - piston connecting rod; 9 - piston seal ring; 10 - steel wire rope gripper; 11 - steel pipe; 12 - clamping groove; 13 - stop point; 14 - claw; 15 - center post; 16 - seal ring installation groove; 17 - gripper connection part; 18 - shrapnel card seat installation groove. Specific Embodiments

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, 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, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] As shown in FIGS. 1 to Figure 10As shown in the figure, the present invention provides an automotive seat belt pre-tensioning end piece, which is used on an automotive seat belt and can retract the waist belt in time when a vehicle collision occurs, reducing the pressure borne by passengers in a collision accident. The pre-tensioning end piece includes a steel wire rope 3, a spring piece clamping seat 7, a piston connecting rod 8, and a steel pipe 11. Among them, the spring piece clamping seat 7 is sleeved on the piston connecting rod 8 and can move together with the piston connecting rod 8. Claws 14 are provided on the circumference of the spring piece clamping seat 7, and the claws 14 can elastically deform along the radial direction of the spring piece clamping seat 7. The piston connecting rod 8 is sleeved on the steel wire rope 3 and can drive the steel wire rope 3 to move in the cavity of the steel pipe 11, thereby realizing the pre-tensioning action, that is, driving the waist belt to retract in an emergency. A clamping groove 12 is provided on the inner wall of the steel pipe 11. The spring piece clamping seat 7 can move together with the piston connecting rod 8 and make the claws 14 snap into the clamping groove 12, thereby restricting the movement of the piston connecting rod 8 in a single direction, that is, the claws 14 can only snap into the clamping groove 12 in one direction, and locking is realized in the reverse direction. In the actual application process, during the ignition process, the claws are deformed by the extrusion of the inner wall of the steel pipe 11, and the barbed claws can smoothly move forward along the inner wall of the steel pipe. When passing through the clamping groove of the steel pipe, the claws rebound and the claws snap into the clamping groove to realize locking. The automotive seat belt pre-tensioning end piece provided by the present invention has a stable anti-axial force ability, effectively improves the reliability of locking, and optimizes the locking performance of the pre-tensioning end piece.

[0036] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10 As shown in the figure, the automotive seat belt pre-tensioning end piece provided by the present invention further includes a steel wire rope gripper 10. The piston connecting rod 8 includes a central column 15. The central column 15 is a hollow structure. A gripper connecting portion 17 is provided at one end of the central column 15. The gripper connecting portion 17 is riveted and integrated with one end of the steel wire rope gripper 10 to form a piston locking assembly, which drives the recovery movement of the steel wire rope by clamping the steel wire rope. The steel wire rope gripper 10 is sleeved on the steel wire rope 3 and can move together in the cavity of the steel pipe 11 under the push of the piston connecting rod 8. The steel wire rope gripper 10 is used to clamp the steel wire rope 3. Further, for the automotive seat belt pre-tensioning end piece provided by the present invention, the claws are of a barbed locking structure, and are locked through the barbed claws and the inner wall clamping groove structure of the steel pipe, and the clamping firmness is good, and it can lock in advance to prevent the problem of too large dynamic locking distance in a collision.

[0037] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10As shown in the figure, the present invention provides a pre-tensioning end piece for an automotive seat belt, which further includes an end piece 1 and a heat shrinkable tube 2. One end of a steel wire rope 3 is connected to the end piece 1 through the heat shrinkable tube 2. A spring piece socket mounting groove 18 is also provided on a central column 15. The spring piece socket 7 further includes a spring piece body, and the spring piece body is of a conical structure. A claw 14 is arranged on the circumference of the spring piece body. The spring piece body is sleeved on the central column 15 and is located in the spring piece socket mounting groove 18. A gap is reserved between the claw 14 and the central column 15, so that the claw 14 undergoes elastic deformation along the radial direction of the central column 15 and can be clamped in a clamping groove 12 to achieve locking.

[0038] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10 As shown in the figure, the present invention provides a pre-tensioning end piece for an automotive seat belt, which further includes a piston seal ring 9. One end of the central column 15 is provided with a seal ring mounting groove 16. The piston seal ring 9 is sleeved in the seal ring mounting groove 16 and can move along with a piston connecting rod 8 in the cavity of a steel pipe 11, so as to form a sealed cavity. Specifically, the piston seal ring 9 slides in the cavity of the steel pipe 11, thereby playing a sealing role, enabling the steel pipe 11 to form a sealed cavity. When inflating the sealed cavity, it can drive the piston locking assembly to move to achieve pre-tensioning.

[0039] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10 As shown in the figure, the present invention provides a pre-tensioning end piece for an automotive seat belt, which further includes a joint body 5 and a gas generator 6. Among them, the joint body 5 includes a first interface and a second interface. The first interface is communicated with the gas generator 6. The second interface is communicated with the sealed cavity of the steel pipe 11. The gas generator 6 ignites gunpowder by receiving an electric signal to convey gas into the sealed cavity, and then pushes the piston connecting rod 8 and a wire rope gripper 10 to slide in the cavity of the steel pipe 11. Specifically, a sensor outside the seat belt gives an electric signal to the ignition device of the pre-tensioning end piece 1, and then the generator 6 starts a chemical reaction to generate gas and enter the sealed cavity, and then pushes the spring piece socket 7, the piston connecting rod 8, and the wire rope gripper 10 to drive the steel wire rope 3 to move forward, and the pre-tensioning action starts. The piston seal ring 9 is used to seal the gas in the steel pipe 11 to ensure a certain gas pressure. During the ignition process, the spring piece is deformed by the extrusion of the inner wall of the steel pipe, and the claw can smoothly move forward along the inner wall of the steel pipe. When passing through the clamping groove of the steel pipe, the spring piece socket rebounds, and the claw is clamped into the clamping groove to achieve locking. The spring piece socket has stable axial force resistance ability, effectively improving the locking reliability.

[0040] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10As shown in the figure, a stop point 13 is further provided on the inner wall of the steel pipe 11. The distance between the stop point 13 and the card slot 12 is set according to the design requirements, and the stroke is less than 10 mm. The stop point 13 is used to limit the moving distance of the piston connecting rod 8 and the wire rope gripper 10 in the steel pipe 11. The relative position of the card slot 12 and the stop point 13 on the inner wall of the steel pipe 11 needs to ensure that the claw can enter the card slot 12 instantly when it is pulled back. Specifically, when the piston connecting rod 8 moves leftward to the first position, the claw 14 can be clamped in the card slot 12, so that the piston connecting rod 8 cannot continue to slide leftward. When the wire rope gripper 10 moves rightward to the second position, the convex ring on the wire rope gripper 10 is limited by the stop point 13 and cannot continue to slide rightward.

[0041] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10 As shown in the figure, the claw 14 is made of spring steel material, that is, the claw 14 is made of 65Mn material. The spring steel material has good compression and resilience, and can realize compression and rebound locking. When the piston connecting rod 8 moves in the cavity of the steel pipe 11, the inner wall of the steel pipe 11 exerts a radial pressure on the claw 14, so that the claw 14 is compressed toward the central column 15, and then the piston connecting rod 8 moves forward on the inner wall of the steel pipe 11.

[0042] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10 As shown in the figure, for the pre-tightening end piece of the vehicle seat belt provided by the present invention, the spring piece card seat 7 has three claws 14 with barbed structures, and the three claws 14 are evenly distributed in the circumferential direction of the spring piece body. The spring piece body connected to the claw 14 is a spring piece structure with a thickness of 1-2 mm. By designing a sufficient radial compression gap, the clamping and recycling functions can be realized. The spring piece body can be made of spring steel material with good resilience (such as 65Mn). The spring piece body is connected to the piston connecting rod 8. When the gas pushes the piston connecting rod 8 to move, the inner wall of the steel pipe 11 exerts a certain pressure on the claw 14, and the claw 14 is compressed downward, so that the claw can move smoothly forward on the inner wall of the steel pipe. The gap reserved between the claw 14 and the central column 15 is more than 0.5 mm to ensure the axial compression and rebound space of the spring piece.

[0043] Preferably, in combination with the above solution, as shown in FIGS. 1 to Figure 10 As shown in the figure, the card slot 12 is arranged in a circle along the inner wall of the steel pipe 11. The relative position of the card slot 12 and the stop point 13 on the inner wall of the steel pipe 11 needs to ensure that the claw 14 can enter the card slot 12 instantly when it is pulled back. One side of the card slot 12 forms an inclined mouth along the axial direction of the steel pipe 11, so that the claw 14 can be clamped in the card slot 12 in a single direction. When the wire rope gripper 10 moves to the front of the stop point 13 on the steel pipe wall and stops moving forward, after the pre-tightening is completed, the webbing pulls the pre-tightening end piece wire rope to move in the reverse direction. When the claw 14 passes through the card slot 12 instantly, the spring piece body rebounds, and the claw of the spring piece card seat 7 is clamped into the card slot 12 on the inner wall of the steel pipe 11 to complete the locking of the pre-tightening end piece.

[0044] Accordingly, in combination with the above solution, as shown in FIGS. 1 to Figure 10 shown, the present invention further provides a vehicle, including a seat belt pretensioner end piece, the seat belt pretensioner end piece being the seat belt pretensioner end piece of the vehicle described above; by using the seat belt pretensioner end piece of the vehicle described above, the safety of vehicle driving can be effectively improved, and the pressure borne by passengers in a collision accident can be reduced.

[0045] The present invention provides a seat belt pretensioner end piece for a vehicle, which is convenient to process, simple to assemble, highly practical and reliable, has a strong ability to resist axial force, and at the same time improves the locking performance of the pretensioner end piece, thereby improving the safety driving performance of the vehicle.

[0046] As described above, the above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the technical content described above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention all fall within the protection scope of this technical solution.

Claims

1. An automotive seat belt pretensioner end piece, characterized in that, The pre-tightening end piece includes a wire rope (3), a spring clip seat (7), a piston connecting rod (8), and a steel pipe (11); the spring clip seat (7) is sleeved on the piston connecting rod (8); a claw (14) is provided on the circumference of the spring clip seat (7), and the claw (14) can elastically deform along the radial direction of the spring clip seat (7); the piston connecting rod (8) is sleeved on the wire rope (3) and can drive the wire rope (3) to move in the cavity of the steel pipe (11), so as to realize the pre-tightening action; a clamping groove (12) is provided on the inner wall of the steel pipe (11); the spring clip seat (7) can move together with the piston connecting rod (8), and the claw (14) is clamped in the clamping groove (12), so as to limit the movement of the piston connecting rod (8) in a single direction; the pre-tightening end piece further includes a wire rope gripper (10); the piston connecting rod (8) includes a central column (15), the central column (15) is a hollow structure, and a gripper connecting part (17) is provided at one end of the central column (15); the gripper connecting part (17) is riveted to one end of the wire rope gripper (10) to be integrated; the wire rope gripper (10) is sleeved on the wire rope (3) and can move in the cavity of the steel pipe (11) under the push of the piston connecting rod (8); the wire rope gripper (10) is used to clamp the wire rope (3); the pre-tightening end piece further includes a joint body (5) and a gas generator (6); the joint body (5) includes a first interface and a second interface, the first interface is communicated with the gas generator (6); the second interface is communicated with the sealed cavity of the steel pipe (11); the gas generator (6) conveys gas into the sealed cavity by receiving an electric signal, and then pushes the piston connecting rod (8) and the wire rope gripper (10) to slide in the cavity of the steel pipe (11); a stop point (13) is further provided on the inner wall of the steel pipe (11), and the distance between the stop point (13) and the clamping groove (12) is less than 10 mm; the stop point (13) is used to limit the moving distance of the piston connecting rod (8) and the wire rope gripper (10) in the steel pipe (11); when the piston connecting rod (8) moves leftward to the first position, the claw (14) is clamped in the clamping groove (12), so that the piston connecting rod (8) cannot continue to slide leftward; when the wire rope gripper (10) moves rightward to the second position, the convex ring on the wire rope gripper (10) is limited by the stop point (13) and cannot continue to slide rightward.

2. The pretensioning end piece of the vehicle seat belt according to claim 1, characterized in that, The central column (15) is further provided with a shrapnel seat mounting groove (18). The shrapnel seat (7) further includes a shrapnel body, and the clamping claws (14) are arranged on the circumference of the shrapnel body. The shrapnel body is sleeved on the central column (15) and is located in the shrapnel seat mounting groove (18). A gap is reserved between the clamping claws (14) and the central column (15), so that the clamping claws (14) can elastically deform along the radial direction of the central column (15) and can be clamped in the clamping groove (12).

3. The pretensioning end piece of the vehicle seat belt according to claim 1, characterized in that, The pre-tightening end piece further includes a piston sealing ring (9). One end of the central column (15) is provided with a sealing ring mounting groove (16). The piston sealing ring (9) is sleeved in the sealing ring mounting groove (16) and can move in the cavity of the steel pipe (11) along with the piston connecting rod (8), so as to form a sealed cavity.

4. The pretensioning end piece of the vehicle seat belt according to claim 1, characterized in that, The clamping claws (14) are made of spring steel material. When the piston connecting rod (8) moves in the cavity of the steel pipe (11), the inner wall of the steel pipe (11) exerts a radial pressure on the clamping claws (14), so that the clamping claws (14) are compressed towards the central column (15), and further the piston connecting rod (8) moves forward on the inner wall of the steel pipe (11).

5. The automotive seat belt pretensioner end piece according to claim 2, wherein, The gap reserved between the clamping claws (14) and the central column (15) is more than 0.5 mm; and / or, there are three clamping claws (14), and the three clamping claws (14) are evenly distributed on the circumference of the shrapnel body.

6. The pretensioning end piece of an automotive seat belt according to claim 1, wherein The clamping groove (12) is arranged in a circle along the inner wall of the steel pipe (11). One side of the clamping groove (12) forms an inclined opening along the axial direction of the steel pipe (11), so that the clamping claws (14) can be clamped in the clamping groove (12) in a single direction.

7. An automobile, comprising a seat belt pretensioner end piece, characterized in that, The seat belt pre-tightening end piece is the seat belt pre-tightening end piece for an automobile according to any one of claims 1 to 6 above.

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