| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil pump for a speed change gear that can securely prevent a bush from coming out of an inner gear by making good use of deformation of the bush loaded by a shaft.SOLUTION: An oil pump has an inner gear 4 formed to rotate in engagement with an outer gear, and is provided with an insertion hole 41, into which a shaft for positioning the center of rotation is inserted, at a shaft center position of the inner gear 4, and the shaft is inserted into the insertion hole 41 through a bush 11. A groove 44 which extends from a surface 4b on one insertion-directional side of the shaft to a surface on the other side is formed on an inner peripheral surface 4a of the inner gear 4, a claw-shaped member 70 configured to rotate on the shaft center position by receiving power is inserted into a space S formed of the groove 44 and bush 11, and the inner gear 4 is enabled to rotate as the claw-shaped member 70 rotates. The groove 44 has parts 47, 48 differing in lateral width. |
