GAS-LIQUID SEPARATION CHAMBER STRUCTURE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide a gas-liquid separation chamber structure for an internal combustion engine, achieving both compactification of the internal combustion engine and an increase in a flow rate of blowby gas.SOLUTION: This gas-liquid separation chamber structure 1 for the internal combustion engine includes: a cylinder head 2 provided in its upper part with a valve train 6 having camshafts 61, 62; a head cover 3 mounted on the upper part of the cylinder head 2 and forming a valve train storage part 25 for storing the valve train 6 between the cylinder head 2 and the head cover; a gas-liquid separation chamber supporting member 4 attached to the head cover 3 and having a blowby gas introducing port 41 communicating with the valve train storage part 25; and a gas-liquid separation chamber member 5 attached to the gas-liquid separation chamber supporting member 4 and having a gas-liquid separation chamber 51 communicating with the blowby gas introducing port 41. The gas-liquid separation chamber supporting member 4 is integrally formed with an oil supply port 42 located adjacently to the blowby gas introducing port 41 and supplying oil to the internal combustion engine.