| 摘要 |
A universal joint yoke ( 1 ) is formed by press-forming a sheet metal ( 60 ) whose thickness is 8 mm or more. The yoke ( 1 ) comprises tabs ( 2, 3 ) formed of a pair of mutually parallel flat plates. First end portions ( 2 a, 3 a) of the tabs ( 2, 3 ) are coupled to each other by a coupling portion ( 4 ). A cylindrical portion ( 5 ) to which a shaft ( 30 ) is joined extends from the coupling portion ( 4 ). From second end portions ( 2 b, 3 b) to intermediate portions ( 2 c, 3 c) of the tabs ( 2, 3 ), relief recesses ( 9, 10 ) are formed on the inside surfaces ( 7, 8 ) of the tabs ( 2 a, 3 a), respectively. By the relief recesses ( 9, 10 ), a columnar relief space ( 11 ) is defined between the tabs ( 2, 3 ). The cylindrical portion ( 5 ) includes a slit ( 14 ) extending in an axial direction of the cylindrical portion ( 5 ).
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