| 摘要 |
PROBLEM TO BE SOLVED: To enhance rigidity while keeping a gear compact.SOLUTION: A gear 1 includes: a disk-like web 1a; and tooth plane 2 disposed at an outer periphery of the web 1a. The gear 1 further includes: a plurality of one face side recessed parts 7a recessing from one face side 1a1 of the web 1a; and a plurality of other face side recessed parts 6a recessing from the other face side 1a2 of the web 1a. The one side recessed parts 7a and the other face side recessed parts 6a are alternately disposed along a circumference direction B1 of the gear 1, and positions thereof overlap in an axial direction F1. |
