Abstract: 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).

Abstract: A belt tensioner for a seat belt system comprises a pinion (10) pivoted about an axis of rotation A which is adapted to be coupled to a best reel of a belt retractor, a drive unit, a force transmission element (12) and a guide means. By activating the drive unit the force transmission element (12) is moved along the guide means so that it engages in the pinion (10). The guide means includes a portion (16) which is deformable in a direction x perpendicular to the axis of rotation A of the pinion (10) and to the direction of movement y of the force transmission element (12).

Abstract: A belt tensioner for a seat belt system comprises a pinion (10) pivoted about an axis of rotation A which is adapted to be coupled to a best reel of a belt retractor, a drive unit a force transmission element (12) and a guide means. By activating the drive unit the force transmission element (12) is moved along the guide means so that it engages in the pinion (10). The guide means Includes a portion (16) which is deformable in a direction x perpendicular to the axis of rotation A of the pinion (10) and to the direction of movement y of the force transmission element (12).

Abstract: 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).