Engine lubrication method

Details Engine lubrication method Engine lubrication method

2007-09-20

2009-12-01

Huynh, Hai H (Department: 3747)

Internal-combustion engines

Lubricators

Crankcase, pressure control

Reexamination Certificate

active

07624714

ABSTRACT:
The present invention is directed to a four-cycle engine including a lightweight aluminum alloy engine block having a cylindrical bore and an oil reservoir formed therein. A crankshaft is rotatably mounted in the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod. An oil pump driven by the cam gear, which mates with a crank gear that is driven by a crank shaft, inhales oil from the oil reservoir and the valve chamber to splash lubricate into the cylinder bore. The engine is provided with a cylinder head assembly defining a compact combustion chamber having a pair of overhead intake and exhaust ports and cooperating intake and exhaust valves and a circular arc wall which surrounds around webs of the crankshaft so that each crankshaft web splashes and causes the oil to fly to lubricate engine parts.

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