Autoliv Development Ab

Mercedes-benz Aktiengesellschaft

Frank Fugel

Thomas Schmidt

Walter Jahn

Klaus Werner Butenop

G&uuml;nter Clute

Lars Axelsson

A self-locking belt retractor has a belt reeling shaft having a belt connected thereto. A locking device, activatable in a vehicle sensitive and/or belt-sensitive manner for preventing belt removal from the belt reeling shaft is provided. The locking device has a locking member and a profiled head connected to the belt reeling shaft. The belt reeling shaft is locked when the locking member engages the profiled head. At least two force-limiting elements are arranged in parallel or in series to one another, wherein one of the force-limiting elements is a torsion bar allowing a limited belt removal when the locking device locks the belt reeling shaft. A switching device for selectively engaging at least one of the force-limiting elements is provided to thereby connect the belt reeling shaft and the profiled head. The switching device is switched between the force-limiting elements and the belt reeling shaft for adjusting the energy absorption of the belt retractor and adapting the belt retractor to pre-adjustable incidents of loading.

Belt retractor with adjustable force-limiting device

Belt winding and tightening combination with a force limiter

A safety belt reeling device with comfort function has a housing and a reeling shaft rotatably supported in the housing. A pawl wheel is fastened to the reeling shaft and switchable between a locked position in which rotation of the pawl wheel is blocked and a release position in which the pawl wheel is rotatable. A winding spring, connected with a first end to the housing and with a second end to the pawl wheel, is provided for rotating the reeling shaft when the pawl wheel is in the release position. A comfort spring with a weaker spring force than the winding spring is provided. The comfort spring is connected with a first end to the pawl wheel and with a second end to the reeling shaft. The pawl wheel has a stay with a first and a second end. The first end of the comfort spring is guided in a single loop about the first end of the stay. An elastically deformable dampening element is positioned between the first end of the stay and the single loop. The dampening element reduces the load impact on the comfort spring, when the pawl wheel is switched into the release position, by allowing a displacement of the single loop relative to the stay.

Safety belt reeling device with comfort function

A self-locking safety-belt reeling device has a reeling shaft on which a safety-belt is wound. A blocking device that is controlled by at least a vehicle-sensitive control mechanism and/or a safety-belt-sensitive control mechanism for blocking the safety-belt reeling shaft is provided. A tightening device acting on the reeling shaft comprises a tightener coupling. The tightening device further has a drive disk. The drive disk, upon activation of the tightening device, is driven in rotation by a drive device and coupled with the tightener coupling to the reeling shaft. A power limiter is connected to the safety-belt reeling device for limiting removal of the safety belt, whereby the power limiter is activated and deactivated depending on the operational states of the safety-belt reeling device and the tightening device. The power limiter during blocking of the safety belt reeling device is inactive and is activated only after completion of a tightening movement of the safety belt. Preferably, the power limiter is a torsion rod.

Safety belt reeling device and safety belt tightening device combination

Growing community of inventors

Halstenbek, Germany

Frank Fugel