Linear motion rolling guide unit

DETAILED DESCRIPTION A primary object of this invention is to solve the above-mentioned problems.
That is, it is an object of the invention to provide a linear motion rolling guide unit, which is characterized in that the total length of the retainer plate which holds two or more rows of rolling elements in raceways is made longer than that of the casing, that the retainer plate is formed with two or more rows of slots that accept and hold the rolling elements in such a manner as to allow the rolling elements to move rolling, and that locking portions of the retainer are inserted into locking grooves in the end caps to fix the retainer plate to the end caps.
Unlike the conventional devices, this linear motion rolling guide unit is not required to form threaded holes in the retainer plate or to machine with high precision the surfaces of the retainer plate that engage with the rolling elements, thus simplifying the construction and reducing the manufacturing costs.
Another object of the present invention is to provide a linear motion rolling guide unit, which comprises: a track rail formed with raceway surfaces extending longitudinally on both side walls thereof; a casing movable relative to the track rail and having raceway surfaces formed at positions facing the raceway surfaces of the track rail; rolling elements traveling rolling between the facing raceway surfaces; end caps having direction changing passages communicating with the raceway surfaces, the end caps being mounted to longitudinal ends of the casing; and retainer plates disposed between the track rail and the casing to support the rolling elements; wherein the total lengths of the retainer plates are longer than that of the casing, the end caps are formed with recesses, and the retainer plates have a retaining means to support the rolling elements in such a way as to allow the rolling elements to move rolling, and a locking means that fits into the recesses of the end caps.
In this linear motion rolling guide unit, the retaining means of the retainer plates are two on more rows of slots that accept and support the rolling elements in such a way as to allow the rolling elements to move rolling, and the locking means of the retainer plates comprise bent portions of the lower end of the retainer plates which are bent away from the track rail and locking portions projecting from both ends of the bent portions