Oil separating apparatus for engine

An oil separating apparatus of an engine having a cylinder head, a piston, a cylinder, a crank chamber and an air intake system for separating oil from blow-by gas and for returning said oil to said crank chamber, comprising:

• a rocker chamber having an enlarged volume and mounted on said cylinder head;
• a breather chamber mounted on said rocker chamber;
• a blow-by gas port provided on said rocker chamber for communicating said rocker chamber with said breather chamber;
• an oil passage having an enlarged passage area for communicating said crank chamber with said rocker chamber;
• and
• a reed valve provided on said blow-by gas port for opening and closing said blow-by gas port.

An oil separating apparatus of an engine having a cylinder head containing an intake valve and an exhaust valve, a cylinder provided in a cylinder block thereunder for inserting a piston in a cylinder liner of the cylinder, push rods with tappets in the cylinder head and block, and a crank chamber including a crank shaft and a cam shaft having cams engaging the tappets, being lubricated by splashing lubrication oil in an oil pan in the crank chamber with an oil dipper connected to a lower portion of a connecting rod mounted on the crank shaft, comprising:

• a rocker chamber mounted on said cylinder head and containing a rocker arm supported by a rocker shaft operatively connected to said intake and exhaust valves and said push rods for opening and closing said intake and exhaust valves at a required timing by being pushed by cams the push rods via the tappets and the cams;
• a breather chamber mounted on said rocker chamber for breathing of said engine via a blow-by gas discharge port;
• a blow-by gas port interposed between said rocker chamber and said breather chamber communicating said rocker and breather chambers for upward flow of a mixture of burnt blow-by gases and said oil;
• and
• the cylinder block and head being formed with a wide oil passage with a relatively narrow oil restricting throttle at an end of the oil passage communicating with said crank chamber, the oil passage having an enlarged widened passage area communicating said crank chamber with said rocker chamber, the widened passage area effectively returning only a liquid portion of said mixture of gases and oil to said crank chamber by separating the liquid portion from said mixture in said enlarged widened passage area, so that substantially only said burnt blow-by gases flow up through said wide oil passage to said breather chamber, so as to constantly keep a sufficient volume of said oil in said oil pan for lubrication without discharging oil from said breather chamber with said blow-by gases.