JP7233512B1 - roller type linear guideway - Google Patents

Abstract

A roller-type linear guideway is provided. The slider includes a rail, a slider covered by the rail, and end cover units attached to both ends of the slider, one of which includes a first cover plate, It includes a second lid plate, a movable end cover and an outer end cover. a first lid plate having a plurality of apertures communicating with the non-loaded channels, a second lid plate having through holes mounted in the first lid plate and communicating with the apertures; A movable end cover is attached to one end of the slider and has a through hole communicating with the through hole. An outer end cover closes the through hole and reverses the plurality of rolling members. According to the present invention, the through hole of the movable end cover, the through hole of the second cover plate, the hole of the first cover plate, and the non-loading channel are communicated with each other, so that four rows of rolling members can be inserted at the same time. . [Selection drawing] Fig. 5

Description

The present invention relates to a linear guideway, and more particularly to a linear guideway with counterflow system.

The reverse flow system of the linear guideway is generally equipped with rolling elements, reverse flow channels, reverse flow modules, etc., and can be broadly divided into a method of combining independent members and a method of integral molding.

In a design where the reflux system is a combination of independent members (see, for example, FIGS. 1A and 1B of US Pat. No. 6,200,000), the first reverse flow channel R1 is composed of the first reflux pipe 91, the first reflux section 92, and the first channel. A roller W formed by 93 and mounted in the first reversing channel R1 is inserted through a first column hole 911 passing through said first reverse flow tube 91 .
Also, as shown in FIGS. 2A and 2B, the first backflow pipe 91 is covered with a cover plate J, the turn portion J1 of the cover plate J completely closes the first column hole 911, and the cover plate J is After coating (see FIGS. 3A-3B), the second reverse flow tube 97, the second reverse flow section 98 and the reverse section J2 of the lid J form a second reverse channel R2. A second column hole J21 is formed in the reversing part J2, and the roller W mounted in the second reversing channel R2 is inserted through the second column hole J21.

Taiwan Patent Application Publication No. 422762

However, in the above-mentioned prior art, this design first inserts two rows of rollers W housed in the first reversing channel R1 and closes the first column hole 911 with the cover plate J during assembly. Later, another two rows of rollers W are inserted through the second column hole J21, and finally the end cover is attached. As a result, there arises a problem that four rows of rollers cannot be inserted at the same time, increasing the number of assembling processes and extending the time required for assembling.

Therefore, the inventor of the present invention thought that the above-mentioned drawbacks could be improved, and as a result of earnest studies, the present inventors came up with the proposal of the present invention that effectively solves the above-mentioned problems with a rational design.

SUMMARY OF THE INVENTION The present invention has been accomplished through intensive research by the inventors in view of the above problems, and an object of the present invention is to provide a roller-type linear guideway.
The present invention solves the problem that four rows of rollers cannot be inserted on the same side of the slider at once, resulting in low assembly efficiency.

A roller-type linear guideway according to one aspect of the present invention for solving the above problems has a rail, a plurality of non-load channels slidably covered on the rail, and a plurality of load channels jointly with the rail. A slider forming a channel and two end cover units mounted at opposite ends of said slider, said end cover units and said load channels and said unload channels jointly producing a plurality of rolling rollers. and two end cover units forming a circulation path for the reverse flow of members, one of which the end cover unit is attached to the slider and communicates with the unloaded channels. and a second cover plate mounted on the other side of the first cover plate facing the slider, wherein the second cover plate and said first lid plate, said first reversal channel communicating with said loaded channel and said unloaded channel, said second lid plate connecting said first lid plate with said A second cover plate having a plurality of through-holes communicating with the holes, and a second cover plate attached to one end of the slider and facing the first cover plate of the second cover plate. a second reversing channel is formed between the movable end cover and the second cover plate, the extending direction of the second reversing channel and the extending direction of the first reversing channel, the movable end cover having a plurality of through holes respectively communicating with the through holes; , an outer end cover attached to the movable end cover and closing the through holes.

As described above, according to the present invention, the through hole of the movable end cover, the through hole of the second cover plate, the hole of the first cover plate, and the non-loading channel are communicated with each other, so that the rolling member can move through the through hole. , through-holes, and holes directly into the unloaded channel, allowing four rows of rolling elements to be inserted simultaneously, eliminating the need to turn over or insert rolling elements separately, reducing assembly time time and increase the potential for automation.

Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

FIG. 4 is a schematic configuration diagram of a conventional roller-type linear guideway in which rollers are installed in a first reversing channel; 1B is a cross-sectional view of FIG. 1A; FIG. 1 is a schematic view of a conventional roller-type linear guideway covered with a cover plate; FIG. 2B is a cross-sectional view of FIG. 2A; FIG. FIG. 4 is a schematic configuration diagram of a conventional roller-type linear guideway in which rollers are installed in a second reversing channel; 3B is a cross-sectional view of FIG. 3A; FIG. 1 is an oblique view showing a roller-type linear guideway according to an embodiment of the present invention; FIG. 1 is an exploded view showing a roller-type linear guideway according to one embodiment of the present invention; FIG. FIG. 4 is an oblique view showing a cover plate and a slider of the roller-type linear guideway according to one embodiment of the present invention; FIG. 4 is a perspective view of the first cover plate and the second cover plate of the roller-type linear guideway according to another embodiment of the present invention; FIG. 4 is a perspective view of the second cover plate and the second movable end cover of the roller-type linear guideway according to another embodiment of the present invention; FIG. 4 is a perspective view of a movable end cover and an external end cover of another viewing angle of the roller-type linear guideway according to one embodiment of the present invention; FIG. 2 is a schematic configuration diagram of a roller-type linear guideway according to an embodiment of the present invention, in which a first cover plate is mounted on a slider; FIG. 4 is a schematic configuration diagram of a roller-type linear guideway according to an embodiment of the present invention, in which a second cover plate is installed outside the first cover plate; FIG. 4 is a schematic configuration diagram of a roller-type linear guideway according to an embodiment of the present invention, in which a movable end cover is provided over a first cover plate and the outside of the first cover plate; 13 is a cross-sectional view shown at 13-13 in FIG. 11; FIG. FIG. 14 is a cross-sectional view shown at 14-14 in FIG. 11; 15-15 of FIG. 4; FIG. FIG. 4 is a perspective view showing a second cover plate and a closed end cover mounted on the second end of the slider of the present invention; FIG. 5 is an exploded view showing a roller-type linear guideway according to another embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It goes without saying that the present invention is not limited to the following examples, and can be arbitrarily modified without departing from the gist of the present invention.

First, a roller-type linear guideway according to an embodiment of the present invention will be described in more detail with reference to FIGS. 4-16.
In this embodiment, a rail 10, a slider 20 and two end cover units Q are provided. Each of the end cover units Q is mounted on both ends of the slider 20, and one of the end cover units Q includes a first cover plate 40, a second cover plate 50, a movable end cover 60, , and the other end cover unit Q includes the first lid plate 40 , the second lid plate 50 and the closed end cover 80 . The rail 10 has an elongated shape, and has a first rolling groove 11, a second rolling groove 12, a third rolling groove 13, and a fourth rolling groove 14 on the outer peripheral surface of the rail 10. have.

The slider 20 is slidably overlaid on the rail 10, the slider 20 is provided with four non-loading channels 21 along the sliding direction X, these non-loading channels 21 being a first non-loading channel 211, A second unloaded channel 212 , a third unloaded channel 213 and a fourth unloaded channel 214 are defined.
The first unloaded channel 211 is adjacent to the second unloaded channel 212 and located on one side of the slider 20, and the third unloaded channel 213 is adjacent to the fourth unloaded channel 214. and located on the other side of the slider 20 . The slider 20 has a first rolling surface 221, a second rolling surface 222, a third rolling surface 223, and a fourth rolling surface 224 along the sliding direction X. defines a first end portion 20A and a second end portion 20B along the sliding direction X. As shown in FIG.

The slider 20 and the rail 10 jointly form four load channels T, which are a first load channel T1, a second load channel T2, a third load channel T3 and a fourth load channel T4. defined. The first rolling groove 11 and the first rolling surface 221 jointly form the first load channel T1, and the second rolling groove 12 and the second rolling surface 222 jointly form the second load channel T1. The third rolling groove 13 and the third rolling surface 223 jointly form the third load channel T3, and the fourth rolling groove 14 and the fourth rolling surface 224 form a channel T2. Together they form said fourth load channel T4.

Preferably, two holders 30 are further provided, the two holders 30 are mounted on the slider 20 and used to hold a plurality of rolling members R, one of the holders 30 is It faces the first rolling surface 221 and the second rolling surface 222 , and the other holding fixture 30 faces the third rolling surface 223 and the fourth rolling surface 224 .

Please refer to FIGS. The first cover plate 40 has a body portion 41 and four backflow pipes 42 connected to the body portion 41. The backflow pipes 42 pass through holes H, and the holes H are It penetrates through the body portion 41 . One of the first cover plates 40 is installed at the first end 20A of the slider 20, and the other first cover plate 40 is installed at the second end 20B of the slider 20. . The main body portions 41 have an inner side 41A and an outer side 41B facing back along the sliding direction X, and the counterflow pipes 42 are connected to the inner side 41A. These backflow tubes 42 are defined as a first backflow tube 421 , a second backflow tube 422 , a third backflow tube 423 and a fourth backflow tube 424 .
The first backflow tube 421 of the first cover plate 40 located at the first end 20A is inserted into the first unloaded channel 211, and the second backflow tube 422 is inserted into the second unloaded channel 212. , the third return tube 423 is inserted into the third unloaded channel 213 , and the fourth return tube 424 is inserted into the fourth unloaded channel 214 .
The first backflow pipe 421 of the first cover plate 40 located at the second end 20B is inserted into the third unloaded channel 213 and the second one of the other first cover plate 40. Three backflow tubes 423 are butt-jointed.
The second backflow tube 422 of the first cover plate 40 located at the second end 20B is inserted into the fourth unloaded channel 214 and the second one of the other first cover plate 40 . The four backflow tubes 424 are butt-jointed. The third backflow tube 423 of the first cover plate 40 located at the second end 20B is inserted into the first unloaded channel 211 and the second one of the other first cover plate 40 . It is butt-jointed to one backflow tube 421 . The fourth backflow tube 424 of the first cover plate 40 located at the second end 20B is inserted into the second unloaded channel 212 and the second of the other one of the first cover plates 40. The two backflow pipes 422 are butt-joined, and the holes H of the backflow pipes 42 are butt-joined to communicate with each other, and the holes H are used to accommodate the rolling members R.

The outer side 41B of each body portion 41 has two first reversing portions 411, respectively. The two first reversing parts 411 extend along the first reversing direction Y1, one of the first reversing parts 411 is connected to the first reversing pipe 421, and the other one of the first reversing parts 411 is connected to the first reversing pipe 421. The part 411 is connected to the fourth reverse flow pipe 424 .

5 and 7, these second cover plates 50 are installed on the outer side 41B of the first cover plate 40, and these second cover plates 50 face back along the sliding direction X. It has an inner counterpart side 51 and an outer counterpart side 52 , said inner counterpart side 51 having two first reversing surfaces 511 . The first reversing surfaces 511 are arcuate surfaces and extend along the first reversing direction Y1, facing the first reversing portions 411 and jointly forming a first reversing channel K1. ing.

10 and 15 are referred to. One of the first reversing channels K1 located at the first end 20A communicates with the first unloaded channel 211 and a second loaded channel T2, and the other one of the first reversing channels K1 is connected with the first reversing channel K1. It is connected to four unloaded channels 214 and a third loaded channel T3. One of the first reversing channels K1, located at the second end 20B, communicates with the second unloaded channel 212 and a first loaded channel T1, and the other one of the first reversing channels K1, located at the second end 20B, communicates with the first reversing channel K1. It is connected to a third unloaded channel 213 and a fourth loaded channel T4.

Please refer to FIG. The second cover plate 50 has four through-holes 53, which are a first through-hole 531, a second through-hole 532, a third through-hole 533 and a fourth through-hole 534 respectively. be. The position of the first through hole 531 corresponds to the first non-loading channel 211, the position of the second through hole 532 corresponds to the second non-loading channel 212, and the position of the third through hole 533 corresponds to the Corresponding to the third unloading channel 213, the position of the fourth through hole 534 corresponds to the fourth unloading channel 214 (see FIG. 8).
The external corresponding side 52 has two second reversing portions 521, which extend along the second reversing direction Y2, and extend along the second reversing direction Y2 and the first reversing direction Y1. There is an included angle between Preferably, said second reversing direction Y2 and said first reversing direction Y1 are perpendicular.

As shown in FIGS. 5, 8 and 9, the movable end cover 60 covers the outside of the first cover plate 40 and the second cover plate 50, and the first end 20A of the slider 20. It has a first side portion 61 and a second side portion 62 which are positioned and face back along the sliding direction X. As shown in FIG. The first side portion 61 faces the second cover plate 50 and the second side portion 62 faces the second cover plate 50 . The first side portion 61 has two second reversed surfaces 611, and the two second reversed surfaces 611 extend along the second reversed direction Y2. These second reversing surfaces 611 are arcuate surfaces and face the second reversing portions 521 and jointly form a second reversing channel K2 (see FIG. 15).
The position of the second reversing channel K2 in the sliding direction X is different from the position of the first reversing channel K1 in the sliding direction X, the first reversing channel K1 being closer to the slider 20 than the second reversing channel K2. are doing. One of the second reversing channels K2 is connected to the second unloaded channel 212 and the first loaded channel T1, and one of the second reversing channels K2 is connected to the third unloaded channel 213 and the fourth channel T1. Communicating with the load channel T4, preferably the direction of extension of said second reversing channel K2 and the direction of extension of said first reversing channel K1 are perpendicular.

See FIGS. 8 and 9. FIG. The movable end cover 60 has four through holes 63 passing therethrough, and these through holes 63 are a first through hole 631, a second through hole 632, a third through hole 633, and a fourth through hole 634, respectively. be. The position of the first through hole 631 corresponds to the first through hole 531, the position of the second through hole 632 corresponds to the second through hole 532, and the position of the third through hole 633 corresponds to the third through hole 531. Corresponding to the through hole 533 , the position of the fourth through hole 634 corresponds to the fourth through hole 534 , and the second side portion 62 has a receiving groove 621 .

As shown in FIG. 9, the outer end cover 70 has four shield parts 71, which are the first through hole 631, the second through hole 632, the third through hole 633, and the shield part 71. The fourth through holes 634 are closed respectively. A connection portion 72 is connected between two of the shield portions 71 and the other two shield portions 71 , and the connection portion 72 is accommodated in the accommodation groove 621 . In this embodiment, the shield portions 71 are bumps, extend along the slide direction X, and have guide surfaces 711, respectively. These guide surfaces 711 are arcuate surfaces, formed as side walls of the first reversing channel K1 or the second reversing channel K2, and are used to guide the rolling members R to reverse.

In a preferred embodiment of the present invention, as shown in FIGS. 9 and 15, these shield parts 71 are further divided into two first shield parts 71A and two second shield parts 71B, wherein the two first shield parts The portion 71A closes the first through hole 631 and the fourth through hole 634, and the two second shield portions 71B close the second through hole 632 and the third through hole 633. As shown in FIG.
The length along the sliding direction X of the first shield part 71A is longer than the length along the sliding direction X of the second shield part 71B. The guide surface 711 of the two first shield parts 71A is the first guide surface 711A, and the first guide surface 711A is the side wall of the first reversing channel K1. The guide surface 711 of the two second shield parts 71B is the second guide surface 711B, and the second guide surface 711B is the side wall of the second reversing channel K2.

5 and 16, the closed end cover 80 covers the outer sides of the first cover plate 40 and the second cover plate 50, and the closed end cover 80 covers the second end of the slider 20. Located in section 20B, the closed end cover 80 has a closed inner side 81 facing the second lid plate 50 and having two curved portions 82 .
The curved portion 82 extends along the second reversing direction Y2, faces the second reversing portions 521, and jointly forms a third reversing channel K3 with the second reversing portions 521. (See FIG. 15). The position of the third reversing channel K3 in the sliding direction X is different from the position of the first reversing channel K1 in the sliding direction X, the first reversing channel K1 being closer to the slider 20 than the third reversing channel K3. are doing. One of the third reversing channels K3 is connected to the first unloaded channel 211 and the second loaded channel T2, and one of the third reversing channels K3 is connected to the fourth unloaded channel 214 and the third channel T2. It is connected to the load channel T3.
The closed mold inner side 81 further has two closed projections 83 , one closed projection 83 closing the first through hole 531 , and another closed projection 83 . closes the fourth through-hole 534 .

Preferably, as shown in FIG. 5, it further comprises two fasteners C, one of which said fastener C is locked to said movable end cover 60, and said outer end cover 70 is attached to said fastener C. and the movable end cover 60, and the external end cover 70 is fixed. Another of the fasteners C is locked to the closed end cover 80 to secure the closed end cover 80 .

Next, a roller-type linear guideway according to another embodiment of the present invention will be described in more detail with reference to FIG. In this embodiment, a rail 10, a slider 20 and two end cover units Q are provided. Each of the end cover units Q is mounted on both ends of the slider 20 respectively, and the two end cover units Q are a first cover plate 40, a second cover plate 50, a movable end cover 60 and an outer end cover. 70 and , respectively.

The slider 20 is slidably overlaid on the rail 10 and has a plurality of non-loaded channels 21 and jointly forms a plurality of loaded channels T with the rail 10 . The slider 20 has the first end 20A and the second end 20B defined along the sliding direction X. As shown in FIG.

The first cover plates 40 are mounted on the first end 20A and the second end 20B of the slider 20, respectively, and the first cover plates 40 have a plurality of holes communicating with the non-loading channels 21. It has part H.

The second cover plates 50 are mounted on the first end portion 20A and the second end portion 20B of the slider 20, respectively, and the second cover plates 50 face the slider 20 of the first cover plate 40. The first reversing channel K1 is formed between the second cover plate 50 and the first cover plate 40 respectively. The first reversing channel K1 communicates with the loaded channel T and the unloaded channel 21, and the second lid plate 50 has a plurality of through holes respectively communicating with the holes H of the first lid plate 40. 53.

Two movable end covers 60 are mounted on the first end 20A and the second end 20B of the slider 20, respectively, and each movable end cover 60 is attached to one of the second cover plates 50. It is located on the other side facing the first cover plate 40 .
The second reversing channel K2 is formed between the movable end cover 60 and the second cover plate 50, and between the extending direction of the second reversing channel K2 and the extending direction of the first reversing channel K1. has an included angle. The movable end cover 60 has a plurality of through holes 63 communicating with the through holes 53 respectively.

Two external end covers 70 are attached to the movable end covers 60 respectively and close the through holes 63 .

The above is a description of the main configuration of each embodiment of the present invention, and the operation method and effect of the present invention will be described below.

10 and 15 are referred to. These rolling members R, when rolling, move from the first unloaded channel 211 to the first end 20A, pass through the first reversing channel K1 to the second loaded channel T2, and move to the second load channel T2. After moving to the second end 20B, it passes through the third reversing channel K3 and re-enters the first unloaded channel 211 .
Also, as shown in FIGS. 11 and 15, the rolling member R located in the second unloaded channel 212 moves to the first end 20A, passes through the second reversing channel K2, and moves to the first end 20A. It travels to one loaded channel T1, travels to the second end 20B, then passes through the first reversing channel K1 and re-enters the second unloaded channel 212. The manner in which the rolling member R circulates through the third loaded channel T3, the fourth loaded channel T4, the third unloaded channel 213 and the fourth unloaded channel 214 includes the first loaded channel T1, the second loaded channel T2, the Since it is the same as the method of circulating the first non-load channel 211 and the second non-load channel 212, its explanation is omitted.

Please refer to FIG. According to the present invention, the through hole 63 of the movable end cover 60, the through hole 53 of the second cover plate 50, the hole H of the first cover plate 40, and the non-loading channel 21 are communicated with each other so that these rolling members R is inserted directly into the unloaded channel 21 through the through hole 63, the through hole 53 and the hole H. As a result, four rows of rolling members R can be inserted at the same time, and there is no need to turn over or insert the rolling members R separately, which greatly reduces the time required for assembly and increases the possibility of automation. .

In addition, according to the present invention, the first end 20A and the second end 20B of the slider 20 are symmetrically mounted with identical first cover plates 40 and second cover plates 50, respectively. Compared to prior art open ends, the design of the closed end members is different, saving molding costs and increasing the efficiency of automated assembly.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention.

91 First reverse flow pipe 911 First column hole 92 First reverse flow section 93 First channel R1 First reverse flow channel 97 Second reverse flow pipe 98 Second reverse flow section R2 Second reverse flow channel J Lid plate J1 Turn section J2 Reverse section J21 Second Two column holes W Roller 10 Rail 11 First rolling groove 12 Second rolling groove 13 Third rolling groove 14 Fourth rolling groove 20 Slider 20A First end 20B Second end 21 Unloaded channel 211 First Non-loaded channel 212 Second non-loaded channel 213 Third non-loaded channel 214 Fourth non-loaded channel 221 First rolling surface 222 Second rolling surface 223 Third rolling surface 224 Fourth rolling surface 30 Holder 40 Fourth One lid plate 41 Body portion 411 First reversing portion 41A Inside 41B Outside 42 Backflow tube 421 First backflow tube 422 Second backflow tube 423 Third backflow tube 424 Fourth backflow tube 50 Second lid plate 51 Internal corresponding side 511 First Reverse side 52 External facing side 521 Second reverse part 53 Through hole 531 First through hole 532 Second through hole 533 Third through hole 534 Fourth through hole 60 Movable end cover 61 First side part 611 Second reverse side 62 Second side portion 621 Accommodating groove 63 Through hole 631 First through hole 632 Second through hole 633 Third through hole 634 Fourth through hole 70 External end cover 71 Shield part 71A First shield part 71B Second shield part 711 Guide surface 711A first guide surface 711B second guide surface 72 connecting part 80 closed end cover 81 closed inside 82 curved part 83 closed convex part C fixture X sliding direction Y1 first reversing direction Y2 second reversing direction T load channel T1 First load channel T2 Second load channel T3 Third load channel T4 Fourth load channel R Rolling member K1 First reversing channel K2 Second reversing channel K3 Third reversing channel H Hole Q End cover unit

Claims (5)

a rail;
a slider slidably overlying the rail and having a plurality of unloaded channels and cooperating with the rail to form a plurality of loaded channels;
two end cover units mounted at opposite ends of said slider, which co-operate with said load channels and said unload channels to provide circulation paths for the reverse flow of a plurality of rolling members; comprising two end cover units,
One of the end cover units includes:
a first lid plate attached to the slider and having a plurality of holes communicating with the non-loaded channels;
a second cover plate mounted on the other side of the first cover plate facing the slider, wherein a first reversing channel is provided between the second cover plate and the first cover plate; wherein said first reversing channel communicates with said loaded channel and said unloaded channel and said second lid plate has a plurality of through holes respectively communicating with said holes in said first lid plate. a second lid plate with a
A movable end cover attached to one end of the slider and located on the other side of the second cover plate facing the first cover plate, the movable end cover and A second reversing channel is formed between the second cover plate, the extending direction of the second reversing channel and the extending direction of the first reversing channel have an included angle, and the movable end a movable end cover, the cover having a plurality of through-holes respectively communicating with the through-holes;
an external end cover attached to the movable end cover and closing the through holes;
Roller type linear guideway. 2. The roller type linear guideway as claimed in claim 1, wherein the other end cover unit comprises the first cover plate, the second cover plate and the closed end cover. The slider is provided with four rolling surfaces along the sliding direction and defines a first end and a second end along the sliding direction; having a plurality of rolling grooves on the outer peripheral surface of the rail extending through the end and the second end, the rolling grooves forming the load channels together with the rolling surfaces; The number of these said load channels and these said non-load channels is four, any one said first lid plate is located at the first end of said slider and another one said said first lid plate is said Located at the second end of the slider, the first cover plates have a main body and four backflow tubes connected to the main body and communicating with the holes, and has an inner side and an outer side facing away along the sliding direction, the backflow tubes are connected to the inner side and are respectively inserted into the non-loaded channels, and the outer side of the main body has two having a first reversing part, the second cover plates are respectively arranged outside the first cover plates, and the second cover plates have an inner facing side and an outer facing side facing back along the sliding direction; and said inner counterpart has two first reversed surfaces facing said first reversed portions and jointly forming said first reversed channels. , the external counterpart has two second reversing parts, the number of through-holes in the second cover plate is four, the movable end cover is located at the first end, and the having a first side facing a second lid, said first side having two second reversed surfaces, said second reversed surfaces facing said second reversed portions, and 3. The roller-type linear guideway as claimed in claim 2, wherein they jointly form said second reversing channel, and the quantity of said through-holes is four. These unloaded channels are defined as a first unloaded channel, a second unloaded channel, a third unloaded channel, and a fourth unloaded channel, and these loaded channels are defined as a first unloaded channel, a second unloaded channel, a defined as a three load channel and a fourth load channel, these backflow tubes being defined as a first backflow tube, a second backflow tube, a third backflow tube, and a fourth backflow tube, located at the first end; said first return tube of said first cover plate is inserted into said first unloaded channel, said second return tube is inserted into said second unloaded channel, and said third return tube is inserted into said third inserted into the unloaded channel, the fourth backflow tube being inserted into the fourth unloaded channel, the first backflow tube of the first cover located at the second end being the third non-loaded channel; inserted into the loaded channel, the second reflux tube inserted into the fourth unloaded channel, the third reflux tube inserted into the first unloaded channel, the fourth reflux tube inserted into the second The number of first reversing channels interposed in the unloaded channels and located at the first end is two, one of which the first reversing channel comprises the first unloaded channel and the second reversing channel. one said first reversing channel communicated with a loaded channel and another said first reversing channel communicated with said fourth unloaded channel and said third loaded channel, said number of said first reversing channels located at said second end being two one of which the first reversing channel communicates with the second unloaded channel and the first loaded channel, and another one of the first reversing channel communicates with the third unloaded channel and the fourth loaded channel and the quantity of said second reversing channels is two, of which one said second reversing channel is communicated with said second unloaded channel and first loaded channel, and another said second reversing channel is communicated with said second 4. A roller type linear guideway according to claim 3, characterized in that a reversing channel communicates with said third unloaded channel and said fourth loaded channel. The outer end cover has four shield parts, which respectively close the through-holes, extend along the sliding direction, and form two first shields. and two second shield parts, the length of the first shield part along the sliding direction is longer than the length of the second shield part along the sliding direction, and these shield parts are positioned along the guide surface. the guide surfaces are arcuate surfaces and guide the rolling members in reverse; the guide surfaces of the first shield portions are the first guide surfaces; the guide surfaces of the second shield portions are is a second guide surface, said first guide surface is a sidewall of said first inverted channel, and said second guide surface is a sidewall of said second inverted channel. The roller type linear guideway described in .

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