| 摘要 |
An electric power steering apparatus (1) comprises a transmission mechanism (19) having a drive gear (20) and a driven gear (21). One end of the drive gear (20) is supported by a bearing hole (33) in a housing (29) through a bearing (31) and a curved plate spring (36). The curved plate spring (36) comprises a main body (37) surrounding the bearing (31) and at least one crank-shaped elastic tongue (39, 40) supported by at least one of ends (38a, 38b) of the main body (37) . A recess (46) formed on an inner peripheral surface (33a) of the bearing hole (33) has a bottom (48) and a pair of inner wall surfaces (47a, 47b) opposed to each other in the circumferential direction of the bearing hole (33). A relief portion (49a) for avoiding contact with a connection portion (41) of the elastic tongue (39, 40) is formed between at least one of the inner wall surfaces (47a, 47b) and the inner peripheral surface (33a) of the bearing hole (33). A boundary (50) between the relief portion (49a) and the inner peripheral surface (33a) of the bearing hole (33) is engaged with the main body (37) of the curved plate spring (36), to restrict the movement of the main body (37) in the circumferential direction. |
