Drive unit for adjusting window panes, sunroofs, seats and similar motor vehicle parts
AssigneeSWF Auto-Electric GmbH
InventorsMarcel Andrei-Alexandru, Wolfgang Kofink, Hans Prohaska
Life of this patent
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Abstract
A drive unit for adjusting window panes, sunroofs, and seats in a vehicle has a reversible electric motor behind which is inserted a worm gear with a worm shaft. To prevent an undesired or unauthorized adjustment of a motor vehicle part, a brake device is provided. The brake device has a mechanical, one-way brake element with which the worm shaft may be coupled by an axial displacement. In order to reduce the effect of the brake device on the worm shaft when the window pane is adjusted by the electric motor, the brake element is the rotatable part of a rotation limiting device and, in the axial direction, it is supported on a stop.
Claims30
A drive unit for adjusting motor vehicle parts, comprising:
- an electric motor having an armature, said motor being operable to rotate said armature in first and second directions;
- a worm gear having a worm shaft coupled to said armature, a worm thread on a portion of said worm shaft, and a worm wheel meshing with said worm thread, said worm shaft being displaceable along its longitudinal axis between first and second limits;
- and
- a brake device including a brake element coupleable to said worm shaft by axial displacement of said worm shaft in one direction;
- a rotation limiting device admitting rotation of said brake element in one direction and preventing rotation of said brake element in the other direction;
- and
- a stop supporting said brake element in the axial direction against pressure exerted by said worm shaft.
Dependencies are inferred from the claim text.