Breather arrangement for cam case of internal combustion engine

摘要

A breather arrangement for an internal combustion engine includes a hollow cam shaft which is disposed in a cam case of the engine. Blow-by gas in the cam case is admitted into an axial bore of the cam shaft, while oil entrained by the gas is separated by centrifugal forces due to rotation of the cam shaft. This allows only the blow-by gas to be recirculated to an intake system of the engine.