Patent ID: 8220997

Claim:
A circulating system for a linear guideway comprising: a slide rail being defined with at least one rail groove at each of two opposite sides thereof; a slide block being defined with an assembling portion at each of two opposite outer sides of a bottom thereof, the slide block being slidably mounted on the slide rail, the slide block being further defined with at least one block groove at each of two opposite sides thereof, the block grooves cooperating with the rail grooves to form plural complete loaded paths; two cover plates being disposed at two opposite ends of the slide block, each of the two cover plates including an inner end surface and an outer end surface, and the two inner end surfaces of the two cover plates respectively abutting against the two opposite ends of the slide block, each of the two cover plates being provided with at least one first return path at each of two opposite sides of the outer end surface thereof and provided with an inner return block extending from the corresponding first return path at one side thereof, the inner return blocks of the two cover plates being disposed in the assembling portions of the slide block, each of the inner return blocks being defined with at least one half rolling path connected to the corresponding first return path; two end caps each including an inner end surface and an outer end surface, the two end caps being disposed opposite each other in such a manner that the inner end surfaces of the end caps abut against the outer end surfaces of the cover plates, respectively, the inner end surface of each of the end caps being defined with at least one second return path at each of two opposite sides thereof, the second return paths of the end caps cooperating with the first return paths of the cover plates to form plural complete return paths, the two end caps being provided with outer return blocks extending from the second return paths, the outer return blocks being disposed in the assembling portions of the slide block, each of the outer return blocks being defined with a half rolling path connected to the corresponding second return path, the half rolling paths of the cover plates cooperating with the half rolling paths of the end caps to form plural complete rolling paths in the assembling portions of the slide block, both ends of the respective complete rolling paths and both ends of the respective complete loaded paths being connected to both ends of the respective complete return paths in such a manner that one of the complete rolling paths, one of the complete loaded paths and two complete return paths form a circulation path; and plural rolling elements being disposed in the respective circulation paths for circulating therein.