| 摘要 |
PROBLEM TO BE SOLVED: To reduce torque of a rolling bearing without changing basic dimensions such as an outer diameter, an inner diameter, or a width dimension of the rolling bearing, and to provide an automobile transmission with low friction and low noise using the rolling bearing for supporting gears. SOLUTION: When a diameter of a rolling element 15 in the rolling bearing 10 is Da, a pitch circle diameter of the rolling element 15 is Dm, and the number of the rolling elements 15 is Z, in a relational expression provided by k=ä(π×Dm)/(Z×Da)}, 2.0≤k≤4.0. An inner ring groove radius Ri of an inner ring raceway surface 11a, and an outer ring groove radius Ro of an outer ring raceway surface 13a are respectively set such that Ri≥0.515×Da, and Ro≥0.515×Da. COPYRIGHT: (C)2011,JPO&INPIT |
