上海充通大学 Shanghai Jiao Tong University Roller Screws(滚子螺旋) >Friction is higher than a ball screw and thus a roller screw is less efficient; >Perform between power screws and ball screws. >however,can support greater axial load because of greater contact area per un length of nut.8 Friction is higher than a ball screw and thus a roller screw is less efficient; Perform between power screws and ball screws. however, can support greater axial load because of greater contact area per unit length of nut. Roller Screws（滚子螺旋）