| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing device for a wheel, in which the wall thickness of an inner ring is optimized to reduce the weight of the device and to make the device compact, and in which the device is reduced in cost by saving the storage space in the manufacturing process and by making the manufacturing process more efficient. SOLUTION: A connection section 31 between an annular recess 29 and an outer diameter surface 7b of an outer member 7 is formed in a circular arc shape substantially concentric with the curvature center of an outer rolling surface 7a to make the wall thickness of the outer member 7 substantially uniform, and an inner diameter surface 8d of the inner ring 8 on the large-diameter side thereof is formed in a circular arc shape substantially concentric with the curvature center of an inner rolling surface 8a to make the wall thickness of the inner ring 8 substantially uniform. The wall thickness Tmi of a bottom groove section of the inner rolling surface 8a is set to be greater than the wall thickness Tmo of a bottom groove section of an outer rolling surface 7a (Tmi≥Tmo), the wall thickness Ti of the inner ring 8 in the direction of contact angle is set to be greater than the wall thickness To of the outer member 7 in the direction of contact angle (Ti≥To), and the inner diameter d1 of a shoulder section 13 is set to be greater than the outer diameter d2 of an end section 14 on the small-diameter side. COPYRIGHT: (C)2011,JPO&INPIT
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