| 摘要 |
PROBLEM TO BE SOLVED: To provide a four-cycle engine for maintaining the lubrication of engine parts while reducing the number of components. SOLUTION: The four-cycle engine uses the vibration of the engine for lubricating the engine parts. The vibration of the engine generates waves on the surface of oil in an oil reservoir arranged in a crank case of the engine. The waves of the oil atomize the oil to lubricate the exposed engine parts. The wall thickness of the crank case is about 1.5mm or smaller, thereby increasing the vibration of the engine. In another embodiment, a gap region arranged in the crank case is reduced to promote the contact of the oil surface waves with a counterweight, thus permitting the splash of oil on the exposed engine parts. The vibration of the engine can be further increased by connecting a vibration plate or a spring to part of the crank case. COPYRIGHT: (C)2005,JPO&NCIPI
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