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目前,我国沿用的测量曲轴连杆120°相位角的方法,其超差数据是用120°相位角允许超差的度数,对应在以中心距为半径的圆周上的弧长计算出来的。由于测量时所选基准不同,连杆所处位置不同,其所对弦长在高度上的投影也不同(由于角度允许偏差较小,弧长约等于弦长)。因此,用高度尺测量120°偏差时,应该根据基准的变化,对
At present, the method of measuring 120 ° phase angle of crankshaft connecting rod used in our country is calculated by using the allowable tolerance of 120 ° phase angle, which corresponds to the arc length on the circumference whose center is the radius. Due to the different benchmarks chosen, the connecting rods are located at different positions, and the projection of the chord length on the height is also different (the arc length is approximately equal to the chord length due to the smaller angle deviation). Therefore, when measuring the deviation of 120 ° with the height gauge, it should be changed according to the reference