Patent ID: 7363904
Filing Date: 2008-04-29
Classification: F01M,F16H

Abstract:
1. An engine lubrication system in which a transmission having a main shaft and a drive shaft each having a plurality of change-speed gears mounted thereon is arranged within a crankcase formed of left and right case portions, comprising: a connecting bolt for connecting the left and right case portions and disposed in parallel with the shafts; and left and right boss portions having bolt bores, into which the connecting bolt for connecting the left and right case portions is inserted, extended in a tubular fashion so as to abut with each other, wherein a space between an inner circumferential surface of the bolt bore in the left and right boss portions and an outer circumferential surface of the connecting bolt is made to constitute a lubricating oil passageway, an end of the lubricating oil passageway is connected to a lubricating oil supply source, lubricating oil supply holes directed to the change-speed gears of the transmission are formed in the boss portions in such a manner as to branch off from the lubricating oil supply passageway, and wherein the connecting bolt and the boss portions are disposed above a position between the main shaft and the drive shaft, and the lubricating oil supply holes are formed so as to be directed toward the change-speed gears on the main shaft and the drive shaft.