Patent ID: 6644140
Filing Date: 2003-11-11
Classification: F16C,F16H,Y10T

Abstract:
A ball screw comprising:a screw shaft having a helical ball rolling groove formed in an outer peripheral surface thereof; a ball nut having a helical ball rolling groove formed in an inner peripheral surface thereof in an opposed relation with the ball rolling groove of the screw shaft, and a ball circulation channel provided therein to connect opposite ends of the ball rolling groove thereof; a plurality of balls provided in a channel defined between the ball rolling grooves and in the ball circulation channel; and a plurality of spacers provided between respective adjacent pairs of balls; wherein the spacers each comprise a base plate having front and back surfaces and at least three mutually spaced projections provided on each of the front and back surfaces of the base plate and projecting outwardly therefrom, the projections on the front surface being angularly offset from the projections on the back surface; wherein the spacers are each provided perpendicularly to a traveling direction of the balls with the projections on the front and back surfaces resiliently abutting against the balls adjacent thereto.