| 摘要 |
PROBLEM TO BE SOLVED: To improve durability of a rolling bearing device for a wheel by mitigating stress on the root part of a flange section.SOLUTION: An R-shape groove part 70 is formed at a joint position with a spigot joint part 23 at the root part of a flange 22, and rigidity at that portion is decreased. Thereby, stress is mitigated. |
