Threaded spindle adjustment drive, has locking element placed in recess for blocking worm wheel with respect to threaded spindle, where no locking element is placed in recess for achieving relative movement of spindle with respect to wheel

摘要

The drive (10) has a worm wheel (11) including an internal thread (20) that meshes with an external thread (22) of a threaded spindle. A recess is provided in the internal thread of the worm wheel or an external thread of the threaded spindle. The locking element is placed in the recess for locking the worm wheel with respect to the threaded spindle. No locking member is placed in the recess for achieving relative movement of the threaded spindle with respect to the worm wheel.