Rolling bearing for linear motion

摘要

The present invention relates to a rolling bearing for linear motion wherein a slide unit is mounted on a track rail. Track plates having track surfaces facing track surfaces on both sides of the track rail are fitted onto the inside surfaces of the slide unit and the slide unit is capable of making a linear motion against the track rail through rolling bodies mounted between the track surfaces of the track plates and the track surfaces of the track rail. The invention is characterized in that both track surfaces are constructed respectively by an upper half track surface and a lower half track surface, the upper contact point of the upper half track surface of the slide unit and the lower contact point of the lower half track surface of the track rail being located symmetric to the center of the ball with an angle less than 45 degrees from the vertical plane passing through the center of the ball, the lower contact point of the lower half track surface of the slide unit and the upper contact point of the upper half track surface of the track rail being located symmetric to the center of the ball with an angle more than 45 degrees from the vertical plane passing through the center of the ball. At least one of the track plates on the slide unit is pressed by a plug which is contacted by the end of a preload bolt screwed into the threaded hole in the slide unit body.