| 摘要 |
An engine lubrication method is provided. The four-cycle engine has a lightweight aluminum alloy engine block having a cylindrical bore and an enclosed 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 crank gear that is driven by crank shaft, inhales the oil from the oil reservoir 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. A lightweight, high-powered engine is thereby provided having relatively low HC and CO emissions. A circular arc wall surrounds around web of the crankshaft with a slight distance from the web. A scroll shaped wall has gradually increased distance from said wall to the direction of rotation of the web and has partial overlap with the circular arc wall. The crankshaft web splashes and flies the oil to lubricate engine parts and the oil after lubricating the parts is forced to return into the oil reservoir guided by scroll shaped wall.
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