Patent ID: 7044641

Claim:
A roller type linear guideway at least comprising: an elongated rail having four sliding surfaces; a slide block having four reflow passages and four sliding surfaces, the slide block is mounted on the rail and slides thereon; a roller-model made up of a plurality of rollers; a recirculating-model made up of a plurality of U-shaped half recirculating pieces, wherein the half recirculating piece is integrally formed with a plurality of return blocks, supporting ribs and return half-tubes, each two half recirculating pieces are combined into a half recirculating-model, the half recirculating-model comprises a return portion, a supporting portion and a reflow portion, the return portion is connected between the supporting portion and the reflow portion, the return portion is provided with an outer return path and an inner return path, two half recirculating-models are inserted from both ends of the slide block with a specific angle so as to form a complete recirculating-model, the recirculating-model is provided with two recirculating paths for the roller-model, the two recirculating paths intersect at the return portion to form a X-type turn, so that the roller-model will circulate in the recirculating paths and will change its direction through the X-type turn in the return portion; two end caps assembled at both ends of the slide block, wherein each of the ender caps is provided with a return curve-surface which is used to cooperate with the outer return path of the half recirculating-model, so as to prevent the roller-model from being fallen off the recirculating path when passing through the outer return path.