| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential gear capable of improving lubricating performance between a pinion shaft and a pinion gear. SOLUTION: The differential gear is provided with the pinion gear 20 and the pinion shaft 10. An outer peripheral side surface of the pinion shaft 10 includes a curved surface part 19 having a curvature, and a flat surface part 14 continued to the curved surface part 19 and not having a curvature. A curve showing a curved surface part in a crossing region of the flat surface part 14 and the curved surface part 19 has an inflection point 91, and a recessed part 13 and a protruded part 12 are provided on the curved surface 19 so that a straight line 16 passing through the inflection point 91 and vertical to the flat surface part 14 crosses the curved surface part 19 in one end and the other end of the inflection point 91. COPYRIGHT: (C)2010,JPO&INPIT
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