Patent ID: 7108426

Claim:
A guide unit comprising: a slider provided on a rail, the slider comprising a casing and an end cap, the end cap provided at least at one end of the casing, the slider including a raceway path formed by said casing and said rail; a direction changing path provided in the end cap; a return path provided in said casing; and an oil retaining sleeve of porous structure inserted into the return path; wherein the slider circulates rolling elements in said raceway path, said direction changing path and said oil retaining sleeve, and wherein a cylindrical guide member is interposed between the direction changing path of the end cap and the oil retaining sleeve, the guide member being distinct from the casing and distinct from the end cap; and the ratio of the length in the axis line direction of the guide member to the diameter of the rolling element is 0.3 to 3.0.