| 摘要 |
PROBLEM TO BE SOLVED: To provide an in-wheel motor driving device which is silent and has high durability.SOLUTION: In an in-wheel motor driving device 21 in which a deceleration portion B includes a decelerator input shaft 25 having eccentric portions 25a, 25b and rotated and driven by a motor portion A, curved plates 26a, 26b rotatably held at outer peripheries of the eccentric portions 25a, 25b through rolling bearings 40, and a motion converting mechanism for converting a self-rotating motion generated on the curved plates 26a, 26b during revolving motion, into a rotating motion of the decelerator output shaft 28, a rolling bearing 40 has a cylindrical roller 44 disposed between an inner raceway surface 42 and an outer raceway surface 43, and annular flange portions 46, 46 disposed in adjacent to an axial outer side of the cylindrical roller 44, surface roughness of at least one of an end face 44a of the cylindrical roller 44 and an end face 46a of the flange portion 46 opposed to each other in an axial direction is determined to be Ra0.25 μm or less.SELECTED DRAWING: Figure 2 |
