According to the formation principle of the tritubercular cycloid in this paper, the rotor, whose bore curve is the inner envelope line of the cycloid, is made with the solid radius vector.

根据三尖摆线的形,以摆线的内包络线定子内腔曲线,动径后作转子,定子、转子按照一定关系运动则形一种新型摆线泵。