Patent ID: 8360644

Claim:
A linear motion guide unit, comprising; a pair of guideway members lying movable relatively to one another and having confronting raceway grooves on their sides extending in a lengthwise direction, a plurality of rollers for rolling element arranged in a raceway defined between the raceway grooves to roll through on raceway surfaces on the raceway grooves, and a cage having a flat cage plate extending in the lengthwise direction of the guideway members and retaining therein the rollers at preselected intervals in such geometry that their own axes tilt alternately in opposite direction to one another; wherein the cage plate has openings to retain the rollers therein arranged to space the respective rollers from each other in the lengthwise direction, the openings each having a contour whose major axis lies in a widthwise direction of the cage plate; wherein the openings are provided inside with bearing lips to retain axially opposite end surfaces of the rollers, the bearing lips extending inside from an edge around the opening at locations corresponding with diametrically opposite ends of the major axis of the opening, and the bearing lips facing each other and ending into wedged bearing edges deformable elastically; wherein the bearing edges have bearing slants each adapted to conform to the end surface of the roller to bear the roller thereon; and wherein the bearing slants are in diametrically symmetric relation to each other at the ends of the major axis of the opening, wherein the bearing lips extending from the locations corresponding with the ends of the major axis towards a center of the opening are less in thickness than a thickness of the cage plate to provide recesses to reserve lubricant on the bearing lips at the locations corresponding with the ends of the major axis, and an overall length of the bearing lips lies in a space defined between opposite flat major surfaces of the cage plate.