| 摘要 |
Highly reliable lubrication and cooling of four-stroke cycle motorcycle engines are achieved by an oil pump and three check valve assembly delivering oil continuously to tappets at the upper end of the cylinders. Engine operation at idling speed or higher produces oil pump pressure exceeding about 12 psi, and the crankshaft bearings are thus continuously lubricated as well. "Wet sump" collection of oil in the crankcase is avoided, and effective cooling of return oil in an external oil tank promotes cooler engine operation.
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