Patent ID: 7107865

Claim:
A power transmission apparatus for a vehicle, which has a main shaft driven by an engine and a countershaft coupled to drive wheels, both of which are provided in parallel to each other and mounted to a case of the apparatus; and a plurality of trains of speed change gears comprised of a plurality of drive gears mounted to the main shaft and a plurality of driven gears mounted to the countershaft; and a switchover sleeve that sets one of the plural trains of speed change gears to be under power transmission state, said apparatus comprising: a reverse shaft which has an idler gear for reverse operation rotatably mounted thereto and is mounted to the case, the idler gear being engaged with a drive gear for reverse operation mounted to the main shaft and a driven gear for reverse operation mounted to the countershaft; a projection which is integrally formed on the reverse shaft and is in contact with one end surface of the idler gear to prevent the idler gear from slipping, and a ring-shaped member which is mounted to the reverse shaft and is in contact with the other end surface of the idler gear to prevent the idler gear from slipping.