Patent ID: 6709158
Filing Date: 2004-03-23
Classification: F16C

Abstract:
A linear motion guide unit comprising; a track rail having a lengthwise side on which a first raceway extends lengthwise thereof, a slider having a second raceway confronting the first raceway and lying for sliding movement relatively to the track rail by virtue of more than one roller that is allowed to roll through a load racecourse defined between the first and second raceways, a separator interposed between any two adjoining rollers so as to be allowed to recirculate together with the rollers through a recirculating circuit that is composed of the load racecourse, turnarounds made in the slider to be connected with the load racecourse, and a return passage made in the slider to be connected with the turnarounds;wherein the separator is made concaved on forward and aft sides flanked by the adjacent rollers to provide concave surfaces that fit over the rollers in rolling contact relation, the concave surface having a length and a width that are able to fit substantially over a semicylindrical surface of the roller, wherein the separator is made with a sunken relief on at least an inward side thereof, which is near a radially inside curved surface in the turnaround, the sunken relief extending lengthwise of the separator and being provided by making the separator reduced in width lest the separator comes in engagement with the radially inside curved surface in the turnaround.