| 摘要 |
<p>A four-stroke engine (10) employs engine vibration for lubricating engine components. The engine vibration induces a ripple in a surface portion of the oil in an oil reservoir (38), which is located within a crankcase (26) of the engine (10). The oil ripple causes misting of the oil, which lubricates exposed engine components. Providing a crankcase (26) wall thickness of about 1.5 mm or less can increase the engine vibration. Alternatively, a clearance area (46) located within the crankcase (26) can be decreased to facilitate contact of the oil surface ripple with a counterweight, thereby splashing the oil onto exposed engine components. Vibration of the engine (10) can be further increased by coupling a vibration plate or spring to a portion of the crankcase (26).
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