Patent ID: 6443263
Filing Date: 2002-09-03
Classification: F01M

Abstract:
A power unit having an internal combustion engine, a side portion, a plurality of components, a hydrostatic continuously variable transmission, and a lubricating system, said power unit and lubricating system comprising:an oil tank; at least one oil pan for the internal combustion engine; a feed pump for feeding lubricating oil in the oil tank to the plurality of components in the power unit; at least one scavenging pump for feeding oil which has stayed in the oil pan back to the oil tank; wherein said oil tank for the power unit is mounted directly to the side portion of the power unit; an initial cooling passage extending from a lower portion of said oil tank to an upper portion of said tank along a rear side portion of said tank, wherein said initial cooling passage is connected to an outlet in communication with a discharge side of each scavenging pump; an upper end portion of the initial cooling passage is in communication with a horizontal passage extending from said rear side portion of the tank to said front side portion of the tank; and a front end of the horizontal passage is formed as a discharge port connected to an oil cooler.