Linear motion guide unit with separator between any two adjoining rolling elements

A linear motion guide unit comprising;

• a track rail having a first raceway groove extending lengthwise thereof and a slider arranged for movement relatively to the track rail by virtue of more than one rolling element, the slider being comprised of a carriage made thereon with a second raceway groove confronting the first raceway groove on the track rail to define a raceway between them, where the rolling elements are allowed to run through there, and also made therein with a return passage allowing the rolling elements to run through there, end caps fastened on forward and aft ends of the carriage, one to each end, and each made therein a turnaround that connects the raceway with the return passage to allow the rolling elements to turn round there, and more than one separator interposed between any two adjoining rolling elements to travel together with the rolling elements, wherein the separator has a round outside peripheral surface, and forward and aft end faces that are made concave to fit over the associated rolling elements, and wherein the turnaround formed in the end cap has a radially inside curved surface where a gutter for relief is cut in a way extending circumferentially of the turnaround, thereby allowing the separator to travel through the turnaround without any interference with the radially inside curved surface of the turnaround.