| 摘要 |
<p>Durability of a pair of inward flange portions (4b, 4c) formed on both ends of a shell (1c) is achieved , with load capacity secured, at an excellent level independent of a thrust load applied by each needle (2a). Inner surfaces (10a, 10b) of both inward flange portions (4b, 4c) are formed as inclined surfaces inclined in the direction where the distance between the surfaces increases toward radially inward. Each of both end surfaces in the axial direction of the needle (2a) is constructed from a beveled portion (8) on the outer peripheral edge and a flat surface portion (9). The structure prevents a large moment load from being applied to the base end portions of the inward flange portions (4b, 4c) even when an end surface of the needle (2a) is butted by an inner surface (10a, 10b) of an inward flange portion (4b, 4c) by a thrust load.</p> |
