CYCLOIDAL SPEED REDUCER AND IN-WHEEL MOTOR DRIVE DEVICE WITH CYCLOIDAL SPEED REDUCER

摘要

PROBLEM TO BE SOLVED: To provide a cycloidal speed reducer excellent in acoustic performance, durability, and the like.SOLUTION: A cycloidal speed reducer comprises: an input shaft 25 including eccentric portions 25a and 25b; and rolling bearings 37 rotatably supporting the input shaft 25 relatively to an output shaft 28, the input shaft 25 including therein a lubricant passage 25c extending axially within the input shaft 25; and a first oil supply hole Pextending radially and supplying lubricant flowing in the lubricant passage 25c to rolling bearings 41 supporting curved plates 26a and 26b, the cycloidal speed reducer being configured so that the rolling bearings 37 are fitted into the input shaft 25 with clearances, and the input shaft 25 further includes a second oil supply hole Pextending radially, and having an inside-diameter end portion opening in the lubricant passage 25c and an outer-diameter end portion opening in fitting portions M1 and M2 for the respective rolling bearings 37.SELECTED DRAWING: Figure 2