| 摘要 |
PROBLEM TO BE SOLVED: To provide a gear 1 that has a tooth 6 having a twisting angle, can reduce sliding resistance of an axial end surface 2b of the gear 1 applied with an axial load L by the twisting angle without increasing the number of components, and can suppress occurrence of sliding abrasion on the axial end surface 2b. SOLUTION: In the gear 1 that has the tooth 6 having the twisting angle, such as a helical gear or a worm wheel formed of resin simple substance or resin and metal fitting, oil grooves 7 are formed in the axial end surface 2b of the gear 1 applied with the axial load L by the twisting angle. The oil grooves 7 are disposed radially or as a spiral dynamic pressure groove. COPYRIGHT: (C)2004,JPO
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