Importance

Loading Importance Indicators...

Abstract

A planetary gear speed reduction mechanism has a sun gear, an internal gear and a plurality of planetary gears disposed between both gears. Each tooth of the sun gear has a tapered portion formed at a front end thereof such that the tapered portion tapers off in the axial direction. The tapered portion has a pair of symmetrical inclined surfaces whose width is tapered off in the circumferential direction from a tooth surface of each tooth and a tapered surface whose peripheral surface is tapered off in the radial direction from an end of a tooth crest surface. In the process of inserting the sun gear into a space among the planetary gears, the sun gear is inserted thereinto under the guide of the inclined surface by slightly rotating the sun gear.

Loading the Abstract Image...

First Claim