ANTRIEBSMECHANISMUS FÜR ELEKTRISCH BETÄTIGTEN RÜCKSPIEGEL.

摘要

A mirror housing (14) is supported rotatably on a shaft (20) fixed to a mirror base (16) which is secured to a vehicle body in such a manner that it can be turned between a normal position and a retracted position by a driving mechanism including a motor (30). The driving mechanism consists of a motor, a reduction gear (32) composed of a plurality of planetary gear units (U1-U4) including a sun gear (90) connected to an output shaft of the motor, and a group of transmission gears including a spur gear (36) mounted fixedly on the shaft (20) and another spur gear (34) connected to an output shaft of the reduction gear and meshed with the spur gear (36). The reduction gear (32) consists of a first casing (70) housing therein some (U1-U3) of the planetary gear units on the same shaft and provided on the inner circumferential surface thereof with a ring gear (72) which is common to these planetary gear units, a second casing (76) which houses therein the remaining planetary gear unit (U4) on the same shaft as the planetary gear units in the first casing so that these planetary gear units are meshed with each other, and which is provided on the inner circumferential surface thereof with a ring gear (74) corresponding to the gear unit (U4), and a bolt (80) by which the first and second casings are combined unitarily with each other. Accordingly, a plurality of planetary gear units can be assembled very easily, and the degree of freedom of designing the driving mechanism with respect to the strength thereof can be greatly increased.