Autoliv Development Ab

Sven Krambeer

Geert Helge Wittenberg

Frank Matzen

Giuliano Begovic

David Winheim

Geert Wittenberg

A belt retractor for a motor vehicle seat belt device, with a rotatably mounted belt reel onto which a seat belt is wound, and a belt tensioner with a drive wheel (), which drives the belt reel in the event of an activation. A positively controlled tensioner coupling transfers the drive movement from the drive wheel () onto the belt reel. At least one coupling pawl () mounted on the drive wheel () and which is moved into and out of engagement with a toothing () rotationally fixed in relation to the belt reel to establish and disconnect a rotational connection of the drive wheel () with the belt reel. A friction ring () has a control arm () coupled with the coupling pawl (), wherein in the event of an activation of the belt tensioner, the friction ring () performs a relative movement to the drive wheel () by frictional forces and, controls via the control arm () the movement of the coupling pawl () into engagement and disengagement with the toothing (). The friction ring () and/or the coupling pawl () has a blocking contour (), positioned such that the coupling pawl () abuts thereon after the disengaging movement out of the toothing () and is blocked in the direction of a repeated engagement movement into the toothing ().

Growing community of inventors

Halstenbek, Germany

Sven Krambeer