The invention provides in a best tensioner (10), especially a rotary tensioner, for a seat belt comprising an elongate and preferably cylindrical pressure cylinder (129, a piston (18) movably supported in the pressure cylinder (12) in the longitudinal direction which is adapted to be pressurized wit
The invention provides in a best tensioner (10), especially a rotary tensioner, for a seat belt comprising an elongate and preferably cylindrical pressure cylinder (129, a piston (18) movably supported in the pressure cylinder (12) in the longitudinal direction which is adapted to be pressurized with fluid under pressure and thus to be moved into a tensioning direction (S), a thrust means (20) interacting with the piston (18) and a stop (24) provided on the inside (38) of the pressure cylinder (12) to which the piston (18) can be adjacent in the tensioning direction (S) at an end position at which the piston (18) seals the pressure cylinder (12), that the stop (24) is made of a plastically deformable material and is plastically deformed by the piston (18) at the end position so that the piston is in sealing contact with the inside of the pressure cylinder (12).
대표청구항▼
1. A belt tensioner (10) for a seat belt comprising an elongate and cylindrical pressure cylinder (12), a piston (18) movably supported in the pressure cylinder (12) in the longitudinal direction which is adapted to be pressurized with fluid under pressure and thus to be moved in a tensioning direct
1. A belt tensioner (10) for a seat belt comprising an elongate and cylindrical pressure cylinder (12), a piston (18) movably supported in the pressure cylinder (12) in the longitudinal direction which is adapted to be pressurized with fluid under pressure and thus to be moved in a tensioning direction (S), a thrust means (20) separate from and interacting with the piston (18) and a stop (24) provided on the inside (38) of the pressure cylinder (12) to which the piston (18) can be adjacent in the tensioning direction (S) at an end position at which the piston (18) seals the pressure cylinder (12), wherein the stop (24) is made of a plastically deformable material and is plastically deformed by the piston (18) at the end position so that the piston is in sealing contact with the inside of the pressure cylinder (12). 2. The belt tensioner according to claim 1, wherein the stop (24) is formed by a constriction of the diameter of the pressure cylinder (12), by a constriction peripheral in the circumferential direction. 3. The belt tensioner according to claim 2, wherein the constriction forms a shoulder or an inclination at the inside (38) of the pressure cylinder (12). 4. The belt tensioner according to claim 1, wherein the piston (18) includes, at a front end viewed in the tensioning direction (S), a cutting edge (30) which is peripheral in the circumferential direction and interacts with the stop (24). 5. The belt tensioner according to claim 1, wherein the diameter of the piston (18) decreases opposite to the tensioning direction (S), wherein the piston is tapered at least in portions. 6. The belt tensioner according to claim 1, wherein the piston (18) comprises a decelerating element (26) interacting with the stop (24) and a sealing element (28) provided in the tensioning direction (S) downstream of the decelerating element (26), wherein the sealing element (28) seals the pressure cylinder (12). 7. The belt tensioner according to claim 6, wherein the decelerating element (26) and the sealing element (28) are interconnected by adhesive force closure and/or form closure. 8. The belt tensioner according to claim 6, wherein the decelerating element (26) includes an extension (32) projecting from the rear side which extends into the sealing element (28). 9. The belt tensioner according to claim 1, wherein the piston (18) includes an convex or partly spherical contact surface (36) for the thrust means (20). 10. The belt tensioner according to claim 1, wherein the thrust means (20) is a toothed rack or a flexible thrust rod which interacts with a gearwheel (22) driving a belt reel. 11. The belt tensioner according to claim 1, wherein an inflator (16) is provided which is fluid-communicated with the pressure cylinder (12) and provides the fluid. 12. The belt tensioner according to claim 1, wherein the sealing contact between the piston and the pressure cylinder prevents fluid flow across the piston. 13. A rotary belt tensioner for a seat belt, comprising: a pressure cylinder extending in a tensioning direction and including a side wall defining an interior, a stop extending inward from the side wall into the interior;a piston positioned within the interior for movement in the tensioning direction; anda thrust means separate from and movable by the piston in the tensioning direction upon activation of the belt tensioner to apply pressurized fluid to the piston, wherein the piston plastically deforms the stop and has an end position in sealing contact with the side wall of the pressure cylinder. 14. The rotary belt tensioner according to claim 13, wherein the stop is a constriction extending radially inward towards a center line of the pressure cylinder. 15. The rotary belt tensioner according to claim 13, wherein the stop is formed by a unilateral constriction of the pressure cylinder. 16. The rotary belt tensioner according to claim 13, wherein a front end of the piston includes a cutting edge defining a maximum diameter of the piston and plastically deforming the stop. 17. The rotary belt tensioner according to claim 16, wherein the piston tapers inward from the cutting edge in a direction extending opposite to the tensioning direction. 18. The rotary belt tensioner according to claim 13, wherein the piston comprises: a decelerating element for plastically deforming the stop; anda sealing element connected to a rear side of the decelerating element for providing sealing contact between the piston and the side wall. 19. The rotary belt tensioner according to claim 18, wherein the decelerating element and the sealing element are interconnected by at least one of adhesive force closure and form closure. 20. The rotary belt tensioner according to claim 18, wherein the decelerating element includes an extension projecting from a rear side which extends into the sealing element. 21. The rotary belt tensioner according to claim 18, wherein the sealing element is formed from a material that is softer than a material of the decelerating element. 22. The rotary belt tensioner according to claim 13, wherein the piston includes a domed contact surface for engaging the thrust means. 23. The rotary belt tensioner according to claim 13, wherein the sealing contact between the piston and the pressure cylinder prevents fluid flow across the piston.
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이 특허에 인용된 특허 (4)
Clare R. Cunningham ; Keith R. Ball ; Bryan W. Shirk ; Sheldon R. Fifield, Jr. ; Vincent J. Mramor ; Brian R. Pitstick ; Eric C. Erike, Gas generator for seat belt pretensioner.
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