Abstract: A linear motion bearing used for guiding portions which perform a linear motion such as a machine tool table and a positioning table. A circulation path of balls (8, 28) is formed a two-part split tube (3, 3') of opposed J shape, or by combination of a two-part split tube (23a) of opposed U shape having a belt-like connection (23c) with a two-part split tube (23b) of opposed J shape, thereby facilitating machining and assembly and attaining reduction of the number of parts.

Abstract: There is a direction turning passage of a rolling bearing for a rectilinear motion comprising: a track member and a slide member which are slidably come into engagement with each other between first and second track surfaces formed in the track and slide members through rolling members. The direction turning passage in the slide member adapted to turn the direction of the rolling members along a curved line is formed by the curves having two or more kinds of curvatures so as to be continuous with the track to which a bearing load is applied, and the first portion at the nearest location of the track side is formed so that its curvature is smaller than that of the second portion subsequent thereto.

Abstract: A linear motion ball bearing used for guiding portions which perform a linear motion such as a machine tool table, a positioning table, etc., the linear motion ball bearing including upper and lower members (1, 1') each having opposed C-shaped grooves (1a) and an intermediate member (2) having upper and lower opposed C-shaped grooves (2a) and upper and lower grooves (2a') for connecting the end portion of the C-shaped grooves, the upper, lower and intermediate members (1, 1', 2) being fitted laminately on a leg portion (3a) of a bearing body (3) to form a ball circulation path, thereby attaining easiness of machining and reduction of the number of parts.

Abstract: A ball spline bearing has an outer sleeve provided with a plurality of load-carrying ball grooves formed in the inner peripheral surface thereof at a predetermined circumferential pitch so as to extend in the axial direction thereof, and a plurality of unloaded ball passages formed in the solid part thereof at a predetermined circumferential pitch so as to extend in the axial direction of the same. The outer sleeve has a hollow which receives a spline shaft which is provided in the outer peripheral surface thereof with a plurality of load-carrying ball grooves, the load-carrying ball grooves in the outer sleeve and the load carrying ball grooves in the spline shaft opposing to each other to form therebetween load-carrying ball passages. A pair of side covers are attached to both open ends of the outer sleeve.