Reduction gear with two steps

摘要

The reduction gear has two gear reduction steps. The first step consists of a worm gear system having a worm (2) and a first gear (3). The second gear reduction step consists of a pinion (4) which is engaged with a second gear (5). The gear of the worm gear system has two lateral parts (31,32) which are axially spaced and have teeth (35). The gear teeth are set such that they pass to the thread of the worm. There is a middle part with teeth (41) between the lateral parts (31,32), having an outer diameter which is smaller than the root line of the first gear teeth. The middle part forms the pinion.