上海充通大学 Shanghai Jiao Tong University Ball Screws(滚珠螺旋) >Ball screw is similar in function to Return tube lead screw Ball screw >Sliding contact between the screw and nut is replaced by rolling contact using recirculating spherical balls,reduce the thread friction,do not suffer from the Ball nut stick-slip characteristics of sliding joints >Leads to higher efficiency,may have 95%efficiency >However,not self-locking. >Have a more limited fatigue life >But have very high load capacity 6
6 Ball screw is similar in function to lead screw Sliding contact between the screw and nut is replaced by rolling contact using recirculating spherical balls, reduce the thread friction, do not suffer from the stick-slip characteristics of sliding joints Leads to higher efficiency, may have 95% efficiency However, not self-locking. Have a more limited fatigue life But have very high load capacity Ball Screws（滚珠螺旋）
上海充通大学 Shanghai Jiao Tong University Ball Screws (滚珠螺旋) >Modern machine tools,automation equipment,and actuators on aircraft use ball screws for high precision, high efficiency,fast response,and smooth operation. Carriage Rotary Encoder XX ☒☒Ⅻ ☒X AC Brushless Motor Flexible Coupling Rearing Housing Ballscrew Ballnut Support Bearings 7
7 Ball Screws（滚珠螺旋） Modern machine tools, automation equipment, and actuators on aircraft use ball screws for high precision, high efficiency, fast response, and smooth operation
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）
上游克通大学 Shanghai Jiao Tong Univers Figure 6.7.2 Recirculating roller screw(top)and planetary roller screw design.Source:SKF Com- ponent Systems Co.,Allentown,PA
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上海充通大学 Shanghai Jiao Tong University Other Applicationsl ES03· DEINNd 10
10 Other Applications 1