Engine unit with lubricant cooling

摘要

An engine unit adapted to be lubricated by a liquid lubricant with a lubricant reservoir as well as a lubricant cooling. The cooling takes place by way of at least one heat pipe, with the heat pipe having a heat absorbing portion adapted to be exposed to the lubricant and a heat transmitting portion adapted to be exposed to surrounding air. The engine unit may be an internal combustion engine, a gear system such as a change-speed transmission or differential transmission of a vehicle drive axle.