FRICTION TORQUE AND EFFICIENCY IN BALL - SCREW SYSTEMS

George V. PUIU¹

Dumitru OLARU²

dumitru_olaru@yahoo.com

Vasile PUIU²

¹ University of Bacau, Dept. of Machine Design, ROMANIA

² Technical University “Gh. Asachi” Iasi, Dept. of Machine Design and Mechatronics, ROMANIA

Abstract. Complex relations for the friction torque and efficiency in a ball-screw system has been developed. The relations were adapted for a ball-screw system and influence of the speed and load on total friction torque were investigated. The efficiency of the system was computed and good agreement with the literature results was obtained. Also, a relation for the global friction coefficient in a ball screw system has been proposed.

Keywords: ball screw system, rolling friction, efficiency

References

1. Olaru, D.N., Lorenz, P., Rudy, D., Cretu, S., Prisacaru, Gh., 2002, “Tribology Improving the Quality in the Linear Rolling Guidance Systems.Part 1 Friction in Two Contact Points Systems,” Proc. of the 13^th International  Colloquium on Tribology, Esslingen  (Germany), 15-17 January, (2002).

2. Olaru, D.N., Lorenz, P., Rudy, D., 2004, “Friction in the Circular–Arc Grooves Linear Rolling Guidance System,” Tribologie und  Schmierungstechnik, 2, pp. 9 –14.

3. Olaru, D.N., Puiu, G., Puiu V., 2004, “Friction in Ball-Screw System,” Proc. of International Conference VAREHD 12, Suceava.

4. Puiu, V., 1999, “Ball Helical Transmission,” Buletinul Institutului Politehnic Iaşi, vol.XLV (XLIX), fasc. 1-2, secţia V (Construcţii de maşini), pp.35-40.

5. Puiu, V., Olaru, D.N., 1999, “Film Thickness in Ball Screw”, Buletinul Institutului Politehnic Iaşi, vol.XLV (XLIX), fasc. 3-4, secţia V (Construcţii de maşini)pp.17-20.

6. Purice, V., 1984, “Influenţa tipului de lubrifiant şi a parame-trilor funcţionali asupra momentului de frecare din şuruburile cu bile,” TRIBOTEHNICA’84, vol. II, Iaşi, pp.105-110.