Patent ID: 7975804

Claim:
A lubricating structure for a transmission, comprising: an axial hole formed penetrating through a gear shaft in an axial direction thereof and having a first opening at one axial end of the gear shaft for supplying therein a lubricant and a second opening at the other axial end of the gear shaft; a first oil hole provided on the gear shaft in a radial direction thereof to establish communication between the axial hole and an outside of the gear shaft; and a tapered groove provided on an inner wall of the axial hole of the gear shaft and extending in the axial direction thereof, the tapered groove being circumferentially limited, the tapered groove being gradually tapered from a first opening side towards a second opening side, wherein the lubricant is supplied to a portion needing lubrication via the axial hole or the lubricant is supplied to the portion needing lubrication via the axial hole and the first oil hole, and the depth of the tapered groove is deeper at the second opening side than that of the first opening side.