UMLENKELEMENT FÜR EINE KUGELUMLAUFSPINDEL

摘要

A circulation member (12) of a ball screw for circulating a ball rolling on a spiral ball rolling groove formed on a screw shaft comprises a central portion and a pair of leg portions disposed at both ends of the central portion so as to extend therefrom and so that free ends of the leg portions are disposed in the spiral ball rolling groove at different positions to thereby form a ball circulation passage. The leg portions have inner peripheries having center lines (21) inclined in directions different from each other with respect to a center line of an inner periphery of the central portion. The circulation member is divided into two parts by first and second division surfaces, the first division surface lying on a plane including a center line of the inner periphery of one of the leg portions and the center line of the inner periphery of the central portion and the second division surface, different from the first division surface, lying on a plane including a center line of the inner periphery of the other one of the leg portions and the center line of the inner periphery of the central portion.