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.

根三尖摆线的形成原理,以摆线的内包络线定内腔曲线,动径实体化后作,定、按照一定关系运动则形成一种新型摆线泵。