Linear motion guide with means for keeping cage against wandering

摘要

A linear motion guide unit is disclosed in which a rack-and-pinion arrangement is interposed between paired guide rails(1,2) to keep a cage(3) retaining more than one rolling element(8) therein against falling off from the guide rails(1,2). In the linear motion guide unit, the cage(3) arranged between confronting raceway grooves(10) of the guide rails(1,2) hold therein a pinion(5), which comes in mating with a rack(4) lying in the raceway grooves(10). The cage(3) is made therein with an aperture(30) in which a thick portion(35) of a pinion holder(6) fits to secure the pinion holder(6) to the cage(3). The pinion(5) is comprised of a disc(13) having teeth(14) that come in mating with the rack(4), and a shaft(36) serving as an axis about which the disc(13) rotates. The pinion(5) is held in the pinion holder(6), with the shaft(36) being carried for rotation in pinion chamber(21) in the pinion holder(6). <IMAGE>