They are usually less efficient than parallel-shaft gears, however, because of an additional sliding movement along the teeth.
他们通常效率较低，比平行轴齿轮，不过，由于一个额外滑运动，沿牙齿。
According to the relative position of sub-gear axis parallel shaft spur gear drive, bevel gear drive shaft and intersecting cross-axis helical gears.
按齿轮轴线的相对位置分平行轴圆柱齿轮传动、相交轴圆锥齿轮传动和交错轴螺旋齿轮传动。
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