| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential gear in which a bearing of low torque is used in place of a tapered roller bearing to thereby improve the fuel consumption, and to solve the problem of increase in costs. SOLUTION: The differential gear includes a pair of anti-friction bearings 30, 31 which rotatably support a differential casing 5 in a differential carrier 1. An oblique-contact ball bearing of a single row is utilized as the anti-friction bearing 31 which is located on the side far from the position where a pinion gear 3 and a ring gear 4 engage with each other. The orbital curvature of an inner ring 36 of the oblique-contact ball bearing 31 is not larger than 51% of and not smaller than 50.5% of the ball diameter. Further, the orbital curvature of an outer ring 37 is not larger than 52% of and not smaller than 51.5% of the ball diameter. A tandem type oblique-contact ball bearing of two or more rows is utilized as the anti-friction bearing 30 located on the side close to the position where the gears engage with each other. COPYRIGHT: (C)2004,JPO&NCIPI
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