| US 7,429,231 B2 | ||
| Rotary drive for a belt tensioner | ||
| Wilfried Bieg, Eschach (Germany); Thomas Moedinger, Aldorf (Germany); and Gerhard Malbrich, Gschwend (Germany) | ||
| Assigned to TRW Automotive GmbH, Alfdorf (Germany) | ||
| Filed on Apr. 26, 2006, as Appl. No. 11/411,704. | ||
| Claims priority of application No. 10 2005 019 603 (DE), filed on Apr. 27, 2005. | ||
| Prior Publication US 2006/0243074 A1, Nov. 02, 2006 | ||
| Int. Cl. F16H 57/08 (2006.01) | ||
| U.S. Cl. 475—331 [475/14; 475/17; 297/474; 297/475; 242/374] | 14 Claims |
| 1. A rotary drive for a belt tensioner, including
a housing,
a pinion (32; 78) rotatably mounted therein, and
at least one driving gear coupled to the pinion (32; 78), the driving gear being mounted in the housing and being adapted to be driven by pressurized gas introduced into a pressure
chamber (20; 68),
in the driving gear there being formed a cavity (24; 70) having a substantially radially extending wall (38; 72) which, in the installed state, is opposite to a protrusion which projects into the cavity (24; 70) and is rigidly connected to the housing, the wall (38; 72) of the cavity (24; 70) and the protrusion forming part of a wall of the pressure chamber (20; 68).
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