Taper support Rib : Rib conical taper at the circumferential rib support, in between the cam groove, Roller Cam with the circumference of linear contact.

• 锥度支撑肋：锥形肋位于锥度支撑肋的圆周上，在凸轮凹槽之间，与凸轮滚子的圆周线性接触。