| 摘要 |
<p>A projecting portion (7b3) projecting axially downward is provided at a bottom portion (7b) of a housing (7), and an outer surface (7b31) of the projecting portion (7b3) is fixed to an inner surface (6a) of a bracket (6). When a thrust load is applied to the bottom portion (7b) of the housing (7), part of the load is supported by the bracket (6) via the projecting portion (7b3). Therefore, the strength of a boundary portion (P) between a side portion (7a) and the bottom portion (7b) of the housing (7) increases, so that fracture of the boundary portion (P) caused by an excessive thrust load can be prevented. T he thickness of the bottom portion (7b) can be made constant, so that deformation due to mold shrinkage of a thrust bearing surface formed at an inner end surface (7b1) of the bottom portion (7b) can be suppressed.</p> |
