The other is a mechanical automatic reversing mechanism designed for atmospheric pumps, which adopts involute (zero pressure Angle) CAM mechanism as reversing mechanism.
另一种是为气压泵设计的机动自动换向机构，该机构是利用渐开线(零度压力角)凸轮机构作为换向机构。
Pressure Angle is never zero, the transmitted force always tends to push centers of the gear apart.
压力角不会是零，传动力总是倾向于把齿轮的中心分开。
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