Patent ID: 6712511
Filing Date: 2004-03-30
Classification: F16C

Abstract:
A linear motion guide unit comprising: an elongated guide member provided with a first lengthwise raceway groove; a slider movable lengthwise along the guide member, said slider being composed of a casing having fore and aft ends and two end caps each attached to a respective one of said ends, said casing being provided with a second raceway groove in confronting relation to said first raceway groove to define a load raceway between said first and second raceway grooves, said casing being provided with a lengthwise bore defining a return passage that extends between said fore and aft ends, and each of said end caps being provided with a turnaround that extends between said load raceway and said return passage, wherein said load raceway, said return passage and said turnarounds form a closed recirculating route;rolling elements allowed to run through said recirculating route; a sleeve having forward and aft ends and composed of a sintered resinous member having a porous texture disposed in said lengthwise bore to encircle said return passage, said member being able to be filled with lubricant, wherein: said lengthwise bore in said casing is made enough in diameter to allow said sleeve to lie therein, while said end caps bear against said forward and aft ends of said sleeve to prevent lengthwise displacement of said sleeve relative to said casing, said sintered resinous member is produced by filling a preselected mold with powdery ultrahigh molecular weight synthetic resin, and then heating the molded resin under high pressure; and the powdery synthetic resin is composed of at least one substance selected from polyethylene, polypropylene and tetrafluoroethylene polymer.