Patent ID: 8662752

Claim:
A motion guide device, comprising: a track member in which a rolling element rolling unit is formed; a moving block in which a load rolling element rolling unit is formed and including a rolling element return path, the load rolling element rolling unit opposing the rolling element rolling unit, and the rolling element return path extending substantially parallel to the load rolling element rolling unit; a pair of cover members formed at both of front and rear ends in a moving direction of the moving block and including a direction change path connecting the load rolling element rolling unit and the rolling element return path; a plurality of rolling elements arranged in a freely rolling manner within a rolling element circulation path configured by the load rolling element rolling unit, the rolling element return path, and the direction change path; and a lubrication path provided in at least one of the pair of cover members and configured to supply a lubricant to the rolling element circulation path, wherein the lubrication path includes: a first lubrication path extending in a horizontal direction from a surface of at least one of left and right side surfaces parallel to a longer direction of the track member in the cover member to a central portion of the cover member; a second lubrication path connected to the first lubrication path and formed in the central portion of the cover member; and a third lubrication path connected to the second lubrication path and formed in a groove shape in a moving block mounting surface of the cover member to thereby cooperate with the moving block to form a path from the second lubrication path of the lubrication path to the rolling element circulation path, and wherein the first lubrication path is formed in a hollow shape continuous to inside a built-up portion projecting from a thinned-down portion of the cover member.