Patent ID: 8142079

Claim:
A linear motion guide unit comprising: a pair of guideway members lying movable relatively to one another and having confronting raceway grooves on their sides extending in lengthwise direction, a cage made of a cage plate having a flat shape and extending in the lengthwise direction to retain more than one rolling element in a raceway defined between the raceway grooves on the guideway members, the cage plate comprising a rectangular contour window cut therein, a rack-and-pinion arrangement provided in the cage which keeps the cage from wandering, the rack-and-pinion arrangement comprises: a pinion holder fitting into the window cut in the cage plate, racks lying on the guideway members, one rack connected to each guideway member, and a pinion provided with teeth mating with the racks and installed in the pinion holder for rotation; and wherein the pinion holder is made up of a first holder half part coming into abutment against one side of the cage plate around the window, and a second holder half part coming into abutment against the other side of the cage plate around the window snap-fit fasteners provided on the first and second holder half parts configured to join together the first and second holder half parts to one another through the window, wherein each of the first and second holder half parts comprise extensions extending outwardly and lying along lengthwise side edges of the first and second holder half parts to squeeze edges of the cage plate on two sides of the window between the first and second holder half parts to retain the cage plate between the first and second holder half parts; and wherein the snap-fit fasteners comprise a latch and a recess at lengthwise opposite ends of each of the first and second holder half parts, so that one latch of one half part is allowed to snap into the corresponding recess of another half part to make a snap-fit connection between the holder half parts.