Abstract: A belt retractor having a belt shaft having a shaft body, a profile head and a torsion bar, wherein the torsion bar arranged in the shaft body is connected on one end to the shaft body and on a second end to the profile head, and the profile head can be securely attached to the vehicle, and having a belt pretensioner, wherein a pretensioner drive wheel of the belt pretensioner is directly connected in a rotationally fixed manner to the profile head of the belt shaft, and mass bodies can be engaged with the pretensioner drive wheel so as to transmit force to drive the belt shaft in winding direction.

Abstract: A belt retractor having a belt shaft having a shaft body, a profile head and a torsion bar, wherein the torsion bar arranged in the shaft body is connected on one end to the shaft body and on a second end to the profile head, and the profile head can be securely attached to the vehicle, and having a belt pretensioner, wherein a pretensioner drive wheel of the belt pretensioner is directly connected in a rotationally fixed manner to the profile head of the belt shaft, and mass bodies can be engaged with the pretensioner drive wheel so as to transmit force to drive the belt shaft in winding direction.

Abstract: Described is a belt tensioner for a seat belt having a belt retractor, a tensioner pinion (4) non-rotatably connected to the belt retractor, a tube (2) having a pyrotechnical gas generator arranged therein, and a plurality of mass bodies (6) driven by the pressure generated by the gas generator. The mass bodies (6) engage with the tensioner pinion (4) in a force transmitting manner and drive the belt retractor in the winding direction. A first and a second section (2a, 2b) of the tube (2) run parallel to each other. A third section (2c) with a curved course that projects out of the plane (E) connects the first and second sections, thereby creating a space (7) between the first, second and third sections (2a, 2b, 2c), for accommodating at least one of the mass bodies (6a, 6b).

Abstract: Described is a belt tensioner for a seat belt having a belt retractor, a tensioner pinion (4) non-rotatably connected to the belt retractor, a tube (2) having a pyrotechnical gas generator arranged therein, and a plurality of mass bodies (6) driven by the pressure generated by the gas generator. The mass bodies (6) engage with the tensioner pinion (4) in a force transmitting manner and drive the belt retractor in the winding direction. A first and a second section (2a, 2b) of the tube (2) run parallel to each other.. A third section (2c) with a curved course that projects out of the plane (E) connects the first and second sections, thereby creating a space (7) between the first, second and third sections (2a, 2b, 2c), for accommodating at least one of the mass bodies (6a, 6b).