Patent ID: 8251588

Claim:
A motion guide device comprising: a track rail in which a plurality of rolling-member rolling surficial areas are formed along a longitudinal direction; a moving block body in which a plurality of load rolling-member rolling surficial areas are formed to be opposed to the rolling-member rolling surficial areas and a plurality of non-load rolling-member return passages are formed to extend in parallel with the load rolling-member rolling surficial areas; a plurality of rolling members that roll between the rolling-member rolling surficial areas of the track rail and the load rolling-member rolling surficial areas of the moving block body; and a retainer rotatably retaining the plurality of rolling members as a series of rolling members, wherein an outer direction changing passage and an inner direction changing passage that both connect the plurality of load rolling-member rolling surficial areas and the plurality of non-load rolling-member return passages in the moving block body cross each other three-dimensionally, characterized in that the motion guide device comprises: a side cover disposed on each of both ends of the moving block body in a moving direction thereof and formed so that an outer peripheral side of the outer direction changing passage and an outer peripheral side of the inner direction changing passage cross each other three-dimensionally, wherein the outer peripheral sides of the inner and outer direction changing passages are formed in the side cover; an inner/outer direction changing passage component built in the side cover and formed to serve as not only an inner peripheral side of the outer direction changing passage but also an outer peripheral side of the inner direction changing passage together with the outer peripheral side of the inner direction changing passage formed on the side cover, a seam existing between the outer peripheral side of the inner direction changing passage of the inner/outer direction changing passage component and the outer peripheral side of the inner direction changing passage of the side cover; a retainer guiding member inserted in the side cover in which the inner/outer direction changing passage component is built, formed to extend over an entire length of the inner direction changing passage, and formed to guide an outer peripheral side of the retainer that passes the inner direction changing passage and to prevent the outer peripheral side of the retainer from passing in direct contact with the seam between the outer peripheral side of the inner direction changing passage of the inner/outer direction changing passage component and the outer peripheral side of the inner direction changing passage of the side cover; and an inner direction changing passage component that forms an inner peripheral side of the inner direction changing passage.