Patent ID: 7290514
Filing Date: 2007-11-06
Classification: F01M

Abstract:
1. A valve train lubricating structure in an internal combustion engine, comprising: a supply feed pump and a return oil pump; an oil pump shaft coaxially connected to an end of a crankshaft, the supply feed pump and the return oil pump being juxtaposed on the oil pump shaft; a supply path for providing a route, through which a lubricating oil delivered from the oil pump is supplied to an oil gallery; and a plurality of branch supply paths for providing routes, through which the lubricating oil is supplied to different parts of the internal combustion engine, one of the plurality of branch supply paths forming a supply path of the lubricating oil to the valve train; wherein the supply path of the lubricating oil to the oil gallery includes a check valve and the supply path going to the valve train is branched off at a point upstream of the check valve, wherein the supply feed pump is adapted to supply the lubricating oil, and the return oil pump is adapted to return oil accumulated in a crankcase to a sump oil tank.