| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the strength (fatigue resistance, etc.) of a gear having a passage such as a lubricating oil supply passage opened at a tooth bottom section by suppressing stress concentration to the opening portion in spite of a simple and inexpensive structure, and thus to improve the durability and life of the gear having the passage such as the lubricating oil supply passage opened at the tooth bottom portion. <P>SOLUTION: In the gear 100 including the lubricating oil supply passage 110 opened at the tooth bottom section 102 between a tooth 101 and a tooth 101, a run off 102A is provided at a circumferential end portion of the tooth bottom section 102 to be recessed from a tooth surface 103 forming the tooth shape, so that an opening end 111 of the lubricating supply passage 110 never crosses the tooth surface 103. <P>COPYRIGHT: (C)2011,JPO&INPIT |
