Abstract: The present invention relates to an ejector clutch (1) for a belt tensioner, comprising a first shaft (10), a second shaft (20), and a coupling part (30), wherein the coupling part (30) is arranged between the first shaft (10) and the second shaft (20) in a longitudinal axis (X) defining an axial direction, wherein the coupling part (30) has at least one clutch finger (40), which engages in a first recess (15) of the first shaft (10) for transmitting a torque (M) and, when a torque (M2) to be transmitted is exceeded, said clutch finger is displaced, against a spring force in the axial direction, from the first recess (15) of the first shaft (10) into a second recess (25) of the second shaft (20). The invention further relates to a belt tensioner with an ejector clutch (1).

Abstract: A control method for an electric seatbelt retractor and an electric seatbelt retractor including a spindle (2) and a seatbelt (3) wound thereon, and an electric motor (4) driving the spindle (2) via a rotor (3) in pull-in or in pull-out direction when activated, and a sensor device (10) detecting the movement of the spindle (2), wherein a spring (11) is provided, which is arranged between the spindle (2) and the rotor (3) enabling a relative movement of the spindle (2) to the rotor (3) or to a retractor-fixed part, wherein the electric motor (4) is controlled by a signal of the sensor device (10) generated by the relative movement of the spindle (2) to the rotor (3) or a retractor-fixed part with torsional tensioning or expanding the spring (11).

Abstract: A power transmission mechanism (19) for transmitting power from a motor (34) to a spindle (12) having a clutch housing (50), a pawl (41) engageable with the clutch housing (50), a gear wheel (57) which holds the pawl (41) and rotates with the rotation of the motor (34), an outer gear cover (26), and a friction ring (42) engaging with the pawl (41) and held on the outer gear cover (26) by frictional force. The friction ring (42) is provided with a protruding portion (42a) which engages with an engagement groove (41b) of the pawl (41), and a plurality of contact pieces (42b) in contact with an outer peripheral surface of a small diameter ring portion (26c) of the outer gear cover (26) and press radially against the outer peripheral surface towards an inner side The friction ring can be easily coupled to the outer gear cover.

Abstract: A control method for an electric seatbelt retractor and an electric seatbelt retractor including a spindle (2) and a seatbelt (3) wound thereon, and an electric motor (4) driving the spindle (2) via a rotor (3) in pull-in or in pull-out direction when activated, and a sensor device (10) detecting the movement of the spindle (2), wherein a spring (11) is provided, which is arranged between the spindle (2) and the rotor (3) enabling a relative movement of the spindle (2) to the rotor (3) or to a retractor-fixed part, wherein the electric motor (4) is controlled by a signal of the sensor device (10) generated by the relative movement of the spindle (2) to the rotor (3) or a retractor-fixed part with torsional tensioning or expanding the spring (11).

Abstract: A reversible seat belt tensioner including a rotationally operable plastic driven gear (1), and a drive moved with a belt shaft of the belt tensioner. At least one coupling pawl (4) is provided on the drive gear, engaging a gearing of the drive gear upon activation of the reversible belt tensioner, and in a load-transmitting position produces a linkage between the driven gear (1) and the drive gear. A support ring (3) made of a material having a greater strength than the driven gear (1) is provided and is connected to the driven gear (1) for with a projection (21, 22) which into a recess (15, 16) of the driven gear (1). The recess (15, 16) positioned such that the coupling pawl (4) is braced against the driven gear (1) via the projection (21, 22) which engages in the recess (15, 16).

Abstract: A power transmission mechanism (19) for transmitting power from a motor (34) to a spindle (12) having a clutch housing (50), a pawl (41) engageable with the clutch housing (50), a gear wheel (57) which holds the pawl (41) and rotates with the rotation of the motor (34), an outer gear cover (26), and a friction ring (42) engaging with the pawl (41) and held on the outer gear cover (26) by frictional force. The friction ring (42) is provided with a protruding portion (42a) which engages with an engagement groove (41b) of the pawl (41), and a plurality of contact pieces (42b) in contact with an outer peripheral surface of a small diameter ring portion (26c) of the outer gear cover (26) and press radially against the outer peripheral surface towards an inner side The friction ring can be easily coupled to the outer gear cover.

Abstract: The invention relates to a belt retractor with an electromotive winding aid (4) comprising a belt shaft (1) which is pretensioned in the winding-up direction by a spring and is mounted rotatably in a frame (3) of the belt retractor on which a belt strap (2) can be wound up. The electromotive winding aid (4) can be activated as a function of the belt-strap-retraction speed (BRS).

Abstract: A reversible seat belt retractor including an electric motor (2), a belt shaft (1) on which a seatbelt is windable, a drive wheel (10) disposed coaxial to the belt shaft (1), and a coupling (11) provided between the belt shaft (1) and the drive wheel (10). The electric motor (2) includes an extended drive shaft (12), via which the electric motor (2) is in direct driving connection with the drive wheel (10).

Abstract: A reversible seat belt tensioner including a rotationally operable plastic driven gear (1), and a drive moved with a belt shaft of the belt tensioner. At least one coupling pawl (4) is provided on the drive gear, engaging a gearing of the drive gear upon activation of the reversible belt tensioner, and in a load-transmitting position produces a linkage between the driven gear (1) and the drive gear. A support ring (3) made of a material having a greater strength than the driven gear (1) is provided and is connected to the driven gear (1) for with a projection (21, 22) which into a recess (15, 16) of the driven gear (1). The recess (15, 16) positioned such that the coupling pawl (4) is braced against the driven gear (1) via the projection (21, 22) which engages in the recess (15, 16).

Abstract: The invention is a belt tightening drive for tightening a seat belt that can be wound about a winding shaft, comprising a spindle shaft driven by a drive unit and a worm drive with a worm supported in a torque-proof fashion on the spindle shaft and a driven wheel, engaged therewith and supported in a torque-proof fashion on the winding shaft. According to the invention it is provided that the worm comprises a first toothed section with a first toothed geometry, wherein the first position of the worm the first toothed section engages the driven wheel, the worm comprises at least a first toothed section and following a second toothed section with a second toothed geometry, with the first and second toothed geometries being embodied differently.

Abstract: The invention relates to a belt retractor with an electromotive winding aid (4) comprising a belt shaft (1) which is pretensioned in the winding-up direction by a spring and is mounted rotatably in a frame (3) of the belt retractor on which a belt strap (2) can be wound up. The electromotive winding aid (4) can be activated as a function of the belt-strap-retraction speed (BRS).

Abstract: The invention relates to a belt tightening drive for tightening a safety belt which can be wound up around a winding shaft, said belt tightening drive comprising an electric motor, a spindle shaft and a output wheel coupled with the winding shaft and a worm gear, by way of which the output wheel is driven by the spindle shaft, wherein for the formation of the worm gear an external helical gear of the output wheel is combing with a worm drive supported torsionally rigid on the spindle shaft and it is provided according to the invention that the external gear of the output wheel comprises at least two gear sections, wherein a first gear section comprises a gear with constant geometry and a following second gear section is designed with an increasing root circle diameter and/or increasing tip circle diameter and/or increasing tooth thickness.

Abstract: The invention is a belt tightening drive for tightening a seat belt that can be wound about a winding shaft, comprising a spindle shaft driven by a drive unit and a worm drive with a worm supported in a torque-proof fashion on the spindle shaft and a driven wheel, engaged therewith and supported in a torque-proof fashion on the winding shaft. According to the invention it is provided that the worm comprises a first toothed section with a first toothed geometry, wherein the first position of the worm the first toothed section engages the driven wheel, the worm comprises at least a first toothed section and following a second toothed section with a second toothed geometry, with the first and second toothed geometries being embodied differently.

Abstract: A safety belt retractor, especially for use in motor vehicles, is provided, and has a blocking system and a tensioning device, which acts on a belt shaft, for carrying out a reversible pretensioning of an occupant. A spiral toothing meshes with an external toothing of the belt shaft, and is supported against a fixed counter-bearing such that upon an axial loading of the spiral toothing directed against the counter-bearing due to load acting on the belt shaft in a belt withdrawal direction, rotation of the spiral toothing, for receiving torque applied by the belt shaft, is prevented via a support force. An electric motor is coupled to the belt shaft via the spiral toothing.

Abstract: A reversible seat belt tensioner includes an electric motor (2), a belt shaft (1) drivable in the belt winding direction by the electric motor (2) via a drive wheel (10), and a drive shaft (9) transmitting the rotational movement of the electric motor (2) to the drive wheel (10). The drive shaft (9) is connected to at least one of the drive wheel (10) and the electric motor (2) via a helical gear unit. The use of a helical gear unit provides the advantage that the rotational axes of the meshing components can be arranged at angles other than 90 degrees with respect to each other because the components in the helical gear units only come into punctiform contact.

Abstract: A reversible belt tensioner (1) with a belt roller and an electric motor (3) that drives the belt roller (2) in roll-up direction, has at least two electrical contacts (11) arranged on the electric motor (3). Counter contacts (10) are fixed on the reversible belt tensioner (1), and the electrical contacts (11) of the electric motor (3) are plugged directly onto or into the counter contacts (10).

Abstract: A reversible seat belt tensioner includes an electric motor (2), a belt shaft (1) drivable in the belt winding direction by the electric motor (2) via a drive wheel (10), and a drive shaft (9) transmitting the rotational movement of the electric motor (2) to the drive wheel (10). The drive shaft (9) is connected to at least one of the drive wheel (10) and the electric motor (2) via a helical gear unit. The use of a helical gear unit provides the advantage that the rotational axes of the meshing components can be arranged at angles other than 90 degrees with respect to each other because the components in the helical gear units only come into punctiform contact.

Abstract: A safety belt retractor, especially in vehicles, is provided that includes a belt shaft as a carrier for a belt that is wound thereon and a vehicle sensitive and/or belt sensitive controllable block device for the belt shaft. The block device includes a force limiting device, effective in the event of a block event, the force limiting device having a viscous medium-filled housing with at least one fixedly positioned contour and a counter-contour that is rotatably displaceable in response to a block event, so that the relative movement between the contour and the counter-contour forces the viscous medium between the surfaces arranged for this purpose. The level of the force limitation applied by the force limitation device is adjustably settable as a function of the parameters associated with the buckled-in passengers via a variation of the inner pressure in the viscous medium-filled housing.

Abstract: A self-blocking belt retractor has an emergency tautening device, which is provided for the belt shaft and which can be tripped, in particular, during an accident, and has a second tautening device, which is also connected to the belt shaft and which is designed as a reversibly operating pre-tautening device. The invention is characterized in that the emergency tautening device (15) is designed to work at a higher rotating speed than the rotating speed produced by the pre-tautening device (11), and the coupling (13, 17, 20) between the pre-tautening device (11) and the belt shaft (14) is designed in such a manner that after the emergency tautening device (15) is tripped, the belt shaft (14) thereby set in a faster rotating motion brings the coupling (13, 17, 20) back into its releasing position whereby releasing the coupling connection between the belt shaft (14) and the pre-tautening device (11).

Abstract: A safety belt retractor, especially in vehicles, is provided that includes a belt shaft as a carrier for a belt that is wound thereon and a vehicle sensitive and/or belt sensitive controllable block device for the belt shaft. The block device includes a force limiting device, effective in the event of a block event, the force limiting device having a viscous medium-filled housing with at least one fixedly positioned contour and a counter-contour that is rotatably displaceable in response to a block event, so that the relative movement between the contour and the counter-contour forces the viscous medium between the surfaces arranged for this purpose. The level of the force limitation applied by the force limitation device is adjustably settable as a function of the parameters associated with the buckled-in passengers via a variation of the inner pressure in the viscous medium-filled housing.