| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a driven wheel which achieves the weight reduction and the compactification, and at the same time, of which the plastic connected part has a sufficient strength even when a large moment load is applied to the device, and which has durability, and at the same time, to increase the durability of working tools such as a broach. SOLUTION: One internal rolling surface 1a of the rolling bearings 2, which are arranged in a plurality of rows, is formed on the outer periphery of a hub hoop 1, and the other internal rolling surface 14a is formed on the outer periphery of an external joint member 14 respectively. A stem part 17 is fitted in the hub hoop 1 on the inner periphery of which a hardened uneven part 5 is formed. At the same time, the diameter of a fitting part 17b of the stem part 17 is expanded and made to bite into the uneven part 5. Such a hub hoop 1 and the external joint member 14 are integrally plastic-connected for the bearing device for the driven wheels. In the bearing device for the driven wheels, the uneven part 5 is constituted of crossing grooves for which a plurality of independent annular grooves and an axial groove are made to be approximately orthogonal, and the groove bottom diameter of the annular groove is formed to be smaller than the groove bottom diameter of the axial groove. At the same time, the distal end shape of a protruding part of the axial groove is formed into a sharp shape. COPYRIGHT: (C)2005,JPO&NCIPI
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