Autoliv Development Ab

Michael Pech

Martin Schmidt

Thomas Schmidt

Christian Fischer

Matthias Steinberg

Tobias Voss

Simone Mesecke-Rischmann

Thomas Schneider

Stefan Suhr

Stefan Bösch

Stefan Höfs

Kay Löffler

A piston for a pretensioner device () for a motor vehicle seat belt system of a type having a gas generator () with the piston () guided in a tube () that closes a pressure space () in the tube (). The pressure space () can be pressurized by the gas generator (), driving the piston () to undergo pretensioning operation transmitted to the seat belt system by a force transmission means. The piston has a dome shaped front side adapted to engage a force transmission element and a skirt forming a sealing lip oriented toward the pressure space. At least one slot is formed in the outer surface of the piston extending axially from the sealing lip. The slot can be enlarged by the material erosion caused by the pressure and/or pressure conditions in the pressure space produced by gas from the gas generator.

Pretensioner device for a seat belt

A tensioning device () for a seat belt, in particular in a motor vehicle, having a gas generator () and a piston () guided in a tube () that closes a pressure space () in the tube (), whereas the pressure space () can be pressurized by the gas generator (), as a result of which the piston () can be driven to perform a tensioning operation which can be transmitted to the seat belt by means of the force transmission means. The piston () having a closed or constricted opening (), and the opening () can be enlarged and/or opened by the material erosion caused by the pressure and/or pressure conditions in the pressure space ().

Tensioning device for a safety belt

A pretensioning device () for a safety belt, of a motor vehicle, having a gas generator (), a piston () guided in a tube (), which closes a pressure area () in the tube () that is pressurized by the gas generator () whereupon the piston () is able to move in a pretensioning movement which is able to be conveyed to the safety belt by means of an inertia body () resting on a front face () of the piston (). The piston () forms a pass-through opening () releasable upon exceeding of a predetermined pressure and a recess () is provided in the front face () with an inertia body () resting thereon, so that a flow connection is created from the pass-through opening () to the area () located behind the piston () in the direction of the pretensioning movement (S).

Pretensioning device for a safety belt

A pretensioner coupling for a seat belt retractor for a motor vehicle of a type having a belt shaft and a pretensioner drive for winding the belt shaft. The pretensioner coupling having a coupling latch movably arranged between a release position and an engagement position. The coupling latch produces a load-transmitting rotational connection between the belt shaft and the pretensioner drive when in the engagement position and movable out of the engagement position and into the release position to permit relative rotation between the belt shaft and the pretensioner drive. An inertial mass mounted on the belt shaft is rotationally arranged in relation to the belt shaft and the coupling latch being coupled with the inertial mass wherein the inertial mass rotates more slowly than the belt shaft upon winding of the belt shaft by the pretensioner drive thereby moving the coupling latch to the engagement position, and wherein the inertial mass rotating faster than the belt shaft at the conclusion of the winding of the belt shaft by the pretensioner drive, moving the coupling latch to the release position.

Seat-belt pretensioner coupling

A self stopping seat belt retractor is provided with a belt shaft for winding a seat belt thereonto and unwinding a wound seat belt therefrom and a housing rotatably supporting the belt shaft and having a locking device that includes a locking means for the belt shaft that can be controlled in a vehicle sensitive and/or belt sensitive manner into engagement with a toothed gearing system on that side of the housing. A tightening device operating on the belt shaft includes a drive wheel, which is, prior to the release of the tightening device, secured in a force-transmitting manner on the housing, is connectable upon release of the tightening device with the belt shaft, whereby the drive wheel of the tightening device is connectable via the locking device with the belt shaft for the transmission of force to the belt shaft.

Growing community of inventors

Hamburg, Germany

Michael Pech