随著曲轴的转动，曲柄销绕主轴作圆周摆动。
As the crankshaft rotates, the crankpin swings in a circle around the shaft.
由于曲柄只作有限度的来回摆动，从而克服了圆周运动中的死点，并能在最理想的角度范围内作功。
Because the crank only swings back and force within limit, therefore, the dead center in circular motion is overcome, and the crank can make power in the most ideal Angle range.
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