Patent ID: 7264086

Claim:
A lubricating system for an internal combustion engine, comprising: a lubricating oil recovery oil passage through which lubricating oil dropping to and dwelling in a bottom portion of a crankcase after lubricating individual portions of the internal combustion engine is fed into a lubricating oil tank through an oil cooler by a recovery pump; a lubricating oil supply oil passage through which said lubricating oil is supplied from said lubricating oil tank to said individual portions of said internal combustion engine needing lubrication and cooling through an oil filter by a supply pump; a branch passage branched from said lubricating oil recovery oil passage communicating from said oil cooler to said lubricating oil tank, said branch passage for supplying said lubricating oil to at least one of said individual portions of said internal combustion engine; and an orifice located in the lubricating oil recovery oil passage between said oil cooler and said lubricating tank.