Patent ID: 6440030
Filing Date: 2002-08-27
Classification: F16H

Abstract:
A driving apparatus comprising:an oscillating internal meshing planetary gear unit having an internal gear and an external gear making internal contact with said internal gear, the center of said internal gear lying inside the periphery of said external gear, and an external unit to be connected with said oscillating internal meshing planetary gear unit so as to be capable of inputting or extracting power thereto or therefrom, wherein: between said oscillating internal meshing planetary gear unit and said external unit is interposed a frictional transmission unit which has a plurality of friction rollers contacting each other, for transmitting rotational power between said oscillating internal meshing planetary gear unit and said external unit by means of friction among said plurality of friction rollers; said frictional transmission unit is constituted by a simple planetary roller mechanism including said friction rollers including a sun roller, a plurality of planetary rollers being retained by a planetary carrier and making rolling contact with the outer periphery of said sun roller, and a ring roller with which said plurality of planetary rollers make internal contact, said simple planetary roller mechanism being constructed so that one of said sun roller, said planetary carrier and said ring roller is used as a fixed element, either of the other two is used as an input element, and a remaining one is used as an output element; of the coupling portions between said frictional transmission unit and said oscillating internal meshing planetary gear unit and between said frictional transmission unit and said external unit, at least one coupling portion has a floating connection structure; and of the coupling portions between said planetary carrier in said frictional transmission unit of simple planetary roller mechanism and said oscillating internal meshing planetary gear unit and between said sun roller and said external unit, at least the coupling portion between said planetary carrier and said oscillating internal meshing planetary gear unit has said floating connection structure.