Patent ID: 8506438
Filing Date: 2013-08-13
Classification: B60K,B60L,F16H

Abstract:
1. A cycloidal speed reducer comprising: a casing; an input shaft having one end arranged in said casing; a disk-shaped eccentric member eccentric with respect to an axis of said input shaft and coupled to the one end of the input shaft; a revolution member supported by said eccentric member, to make a revolution motion around said axis together with a rotation of said input shaft; a rolling bearing arranged between an inner circumference of said revolution member and an outer circumference of said eccentric member, and a bearing internal gap of said roller bearing being larger than zero; an outer circumference engagement member supported by said casing and engaging with an outer circumference part of said revolution member to cause the revolution member to make a rotation motion; and an output shaft engaging with said revolution member to extract the rotation motion, wherein said rolling bearing has a rolling body, an inner ring member mounted on the outer circumference of said eccentric member, and a lubricant oil hole penetrating from an inner diameter surface of the inner ring member to an outer circumference track surface thereof to supply a lubricant oil to the outer circumference track surface of the inner ring member being in rolling contact with said rolling body, and said lubricant oil hole is arranged in a non-load range in which a bearing load is not applied from said output shaft and said outer circumference engagement member to said revolution member, in the outer circumference track surface of said rolling bearing, wherein the inner ring member of the rolling bearing has: the input shaft has an axis oil path along its axis, the eccentric member has a lubricant oil path from the axis oil path toward the radial outer side of the eccentric member, and an annular groove is provided between the eccentric member and the inner ring member, the annular groove circumferentially extending and connecting the lubricant oil path and the lubricant oil hole.