| 摘要 |
A crankshaft is provided with a plurality of counterweights which are asymmetrically formed so that one surface has a shape which induces a flow of air and oil mist in a preselected and preferred direction. This shape also improves the aerodynamic characteristic of the counterweight and reduces the friction that the counterweight would otherwise experience as it rotates about the rotational axis of the crankshaft. A tapered surface is provided on a lower surface of each crankshaft and the tapered surface is positioned at a leading edge of each counterweight.
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