Patent ID: 6729761
Filing Date: 2004-05-04
Classification: F16C

Abstract:
A linear motion guide unit comprising, a track rail provided on sidewise opposing sides thereof with first lengthwise raceway grooves, one to each side, a slider having second raceway grooves confronting the first raceway grooves and fitting over the track rail in a way movable lengthwise with respect to the track rail, and more than one rolling element allowed to run through load raceways defined between the first raceway grooves on the track rail and the second raceway grooves in the slider, wherein the slider is comprised of a carriage having the second raceway grooves thereon and through-holes extending therein along the second raceway grooves, sleeves fit in the through-holes, one to each through-hole, in a way lining the through-hole with only forward and aft ends of the through-hole being left naked, thereby providing a major area of a return passage, spacers arranged on forward and aft ends of the carriage, one to each end, the spacers each having a radially inside curved half for a turnaround to connect the load raceway and the return passage and also having an inside part for a joint tube to make up for any one end of the return passage joining with the radially inside curved half after fitted in the naked end of the through-hole, and end caps arranged on outside ends of the spacers, one to each outside end, the end caps each having a radially outside for the turnaround and also having an outside part for the joint tube to make up for any one end of the return passage joining with the radially outside curved half after fitted in the naked end of the through-hole.