Patent ID: 11370390

Abstract:
The invention relates to a belt tightener (1) with a mass body drive for a seat belt of a motor vehicle with a force-limiting device with—a belt shaft (3) mounted rotatably in at least one opening (15) of a housing (14) that can be fastened fixedly to the vehicle, it being possible to wind up the seat belt on said shaft, —a tightener drive wheel (24) connected non-rotatably to the belt shaft (3) and having recesses (14) distributed at regular intervals over the circumference, —a chain forming the mass body drive made of loose mass bodies (19), which are guided in a tightener tube (10) and can be driven by pressure application of the tightener tube (10), wherein—the belt shaft (3) can be driven in the winding direction of the seat belt by engagement of the driven mass bodies (19) in the recesses (14) of the tightener drive wheel (24), wherein—the mounting of the belt shaft (3) in the opening (15) of the housing (14) is designed to be flexible in the radial direction.