Patent ID: 8070360

Claim:
A motion guide device for a vacuum environment, characterized in that the device comprises: a track member having a rolling-element rolling part; a moving member having a loaded rolling-element rolling part facing the rolling-element rolling part and being movable relative to the track member; a plurality of rolling elements disposed between the rolling-element rolling part and the loaded rolling-element rolling part; a lubricant storing member disposed on the moving member without contacting the track member, exposed in a clearance formed between the track member and the moving member, and formed to store therein lubricant; and a clearance seal disposed on the moving member to seal the clearance formed between the track member and the moving member without contacting the track member, wherein, in the vacuum environment of pressure lower than atmospheric pressure, vaporized lubricant reaches the rolling-element rolling part, the loaded rolling-element rolling part, and the rolling elements for lubrication thereof, the lubricant storing member is made up of bonded textile or porous material produced by baking metal powder or by foaming formed materials of which voids are filled with the lubricant, and the lubricant storing member is disposed within a sealed space enclosed by the track member, the moving member, and the clearance seal.