Patent ID: 6605019
Filing Date: 2003-08-12
Classification: F16H

Abstract:
A two stage planetary gear shifting device having a sun gear, a planetary carrier (15) supporting a plurality of planetary gears (13), and a hollow internal ring gear (18), the sun gear (12) being connected to an input shaft (1) and the planetary carrier (15) being connected to an output shaft (2) to supply output drive thereto, and the hollow internal ring gear (18) being engageable, via a slide collar (19), with one of a gear drive housing (3) for the shifting device and the sun gear (12), and the slide collar (19) is coaxially slidable, with respect to the input shaft (1), into a plurality of shift positions by an electrical positioning member (31);wherein the positioning member (31) is an electromagnet, the electromagnet (31) has an armature (33) which is drivingly connected with the slide collar (19), the sliding collar comprises an outer part (20) and the inner part (21) with a bearing (22) located between the outer part (20) and the inner part (21), and the electromagnet (31) has a retaining element which retains the armature (33) in a desired one of the plurality of shift positions.