Patent ID: 6886983

Claim:
A linear motion guide unit with means for keeping a cage against wandering, comprising; a pair of guide rails that are arranged movable relatively to one another and have confronting raceway grooves on their lengthwise sides, one to each side, a cage lying in a raceway defined between the raceway grooves on the guide rails, with retaining therein more than one rolling element, racks lying in the raceway grooves, one to each raceway groove, in opposition to one another, and a pinion having teeth mating with the opposing racks and installed in the cage for rotation; wherein the cage has therein an aperture in which a pinion holder fits, and the pinion is accommodated for rotation in a pinion chamber defined in a middle area inside the pinion holder, wherein the pinion comprises a disc in which the teeth are positioned circumferentially at regular intervals around the disc to form tooth spaces each separating any two adjacent teeth, and a shaft, which is made as a unit with the disc, is forced into the pinion chamber to fit for rotation in the pinion chamber to provide an axis about which the disc rotates, wherein the pinion holder has a thick portion raised above any one side thereof so as to fit in the aperture in the cage along an edge surrounding the aperture, thereby providing the pinion chamber, and a flange portion surrounding the thick portion so as to come into engagement with any flank of the cage around the aperture to join the pinion holder to the cage, and wherein the pinion chamber defined in the middle area inside the pinion holder includes a bearing area where the pinion shaft is carried for rotation after being forced to fit therein, and a pinion area where the disc of pinion is installed.