| 摘要 |
PROBLEM TO BE SOLVED: To achieve a structure capable of suppressing groan sound noise generated based on passage of respective balls 3a, 3a at a damaged portion such as impression generated on an inner ring orbit 8a and an outer ring orbit 5a of an axial direction outside row, at low cost. ! SOLUTION: Reinforcement ribs 17, 17 are provided on positions crossing a virtual line α representing a contact angle of balls 3a, 3a of an axial direction outside row, at plural portions of a circumferential direction of an inner surface of a recess part 11a of a hub body 6a. The respective ribs 17, 17 are integrated with the hub body 6a by forging processing when producing the hub body 6a. ! COPYRIGHT: (C)2015,JPO&INPIT |
