Linear motion rolling guide unit

TL;DR: In this article, a linear motion rolling guide unit consisting of a track rail member, a slidable casing straddling the track rail, with a plurality of balls being intervened there between, is described.

Abstract: The present narrow gauge linear motion rolling guide unit consists of a track rail member, a slidable casing straddling said track rail member in a freely slidable relation therewith with a plurality of balls being intervened therebetween, which are travelled through and along a pair of endless circulating passages provided in the slidable casing at symmetrically opposite positions relative to the longitudinal axis thereof, each endless circulating passage including a load bearing guide groove, a return passage and a pair of direction changing passages that are provided in each of the side panel fixed onto the opposing ends of said slidable casing. Each of the direction changing passage is arranged in the side panel to form, as seen in the cross section of the unit including side panel, an arcuate section of a circle having a center that is positioned, in the side panel, and on an extention line passing through the center of a ball present in the load bearing passage and extending in parallel with the inclined inner side surface of the slidable casing, so that the distance between a pair of ball return passages built in the slidable casing can be minimized, resulting in narrowing of the breadth of the casing.