| 摘要 |
PROBLEM TO BE SOLVED: To keep a tensile stress in a constitution element low by that an annular ring member has first/second end surfaces arranged in a cradle member and outer shaft symmetrical surface and an anular ring structure has a hook shape end cnontacted with an inner installation part and arranging a wing type member between the annular ring member and annular ring structure. SOLUTION: At an assembled position, first/second end surfaces 60, 62 of an outer annular ring member 46 are contacted with the contact surfaces 116, 106 of the first/second radial end surfaces 108, 104 of a cradle member 102 respectively. A second end surface 180 having the round part 182 of a spring formed retainer 170 pushes so that the horizontal surface 84 of the hook shape end 74 of an inner annular ring structure 48 is contacted with a first horizontal surface 162 of a hollow 160. The wear surface 78 of the hook shape end 74 is pushed so as to contact with the toroidal second end 156 of the connection flange 138 of an inner installation part 42 and the inner flat surface 72 of an inner annular ring structure 48 is pushed so as to contact with the outer tapered outer periphery surface 150 of a connection flange 138.
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