Patent ID: 6109788
Filing Date: 2000-08-29
Classification: F16C

Abstract:
A pair of ball bearings for permitting linear movement, comprising:a first ball bearing comprised of a first cage, the first cage having an inside surface, said first cage having a plurality of ball tracks in each of which is positioned a plurality of balls, each ball track including an axial guide track, an axial return track and turn-around tracks connecting ends of the guide track with ends of the return track, said first cage having at least in the axial guide tracks slits that are open radially inwardly and through which the balls are exposed, said first cage having an outer circumference along which is distributed a plurality of recesses and ball track plates each inserted into one of the recesses, said ball track plates having axially extending ball tracks with a curved cross-section possessing an inner radius of curvature for receiving the balls in the guide tracks, said ball track plates having an outer radius of curvature; anda second ball bearing comprised of a second cage, the second cage having an inside surface, said second cage having a plurality of ball tracks in each of which is positioned a plurality of balls, each ball track of the second cage including an axial guide track, an axial return track and turn-around tracks connecting ends of the guide track with ends of the return track, said second cage having at least in the axial guide tracks slits that are open radially inwardly and through which the balls are exposed, said second cage having an outer circumference along which is distributed a plurality of recesses with a ball track plate positioned in each of the recesses, said ball track plates in the second cage having axially extending ball tracks with a curved cross-section possessing an inner radius of curvature for receiving the balls in the guide tracks, said ball track plates in the second cage having an outer radius of curvature;said first ball bearing and said second ball bearing having different outer diameters, the inner radius of curvature of said ball track plates of said first ball bearing being the same as the inner radius of curvature of the ball track plates of the second ball bearing, the outer radius of curvature of the ball track plates of said first ball bearing being the same as the outer radius of curvature of the ball track plates of said second ball bearing.