POWER UNIT

摘要

A power unit having a casing for rotatably supporting a driving force output power shaft and for protecting an oil seal provided between the casing and the driving force output power shaft. A first casing for rotatably supporting input power shafts and a second casing disposed at a position offset in an axial direction from the input power shafts and having an output power shaft supporting portion on which a driving force output power shaft provided in the transmission. The first and second casings are disposed adjacent each other such that the output power shaft supporting portion projects to a side farther than the first casing. A breather chamber is formed between first and second case members which cooperate with each other to configure the second casing disposed above a projection of one end portion of the driving force output power shaft from the output power shaft supporting portion.

主权项

1. A power unit which includes an internal combustion engine and a transmission configured to change the speed of output power of the internal combustion engine and output the output power of the changed speed from a driving force output power shaft and is mounted on a vehicle, the power unit comprising:
the transmission includes input power shafts disposed at a position offset in an axial direction of the driving force output power shaft from the driving force output power shaft so as to have an axial line parallel to the driving force output power shaft and to which rotational power is inputted from the internal combustion engine; a first casing for supporting the input power shafts for rotation thereon and a second casing having an output power shaft supporting portion on which the driving force output power shaft is supported for rotation are disposed adjacent each other such that the output power shaft supporting portion projects to a side farther than the first casing; and a breather chamber is formed between first and second case members which cooperate with each other to configure the second casing so as to be disposed above a projection of one end portion of the driving force output power shaft from the output power shaft supporting portion.