Roller linear guide rail

Abstract

The present invention provides a roller linear slide rail, comprising: a rail, a slider sleeved on the rail, and end cap units installed at both ends of the slider. One of the end cap units includes a first cover plate, a second cover plate, an open end cap, and an outer end cap. The first cover plate has a plurality of through holes communicating with non-load channels. The second cover plate is installed on the first cover plate and has through holes communicating with the through holes. The open end cap is installed at one end of the slider and has through holes communicating with the through holes. The outer end cap closes the through holes to enable the return flow of a plurality of rolling elements. In the present invention, the through holes of the open end cap, the through holes of the second cover plate, the through holes of the first cover plate, and the non-load channels are communicated. Therefore, four columns of rolling elements can be filled simultaneously.

Description

Technical Field

[0001] The present invention relates to the field of linear slide rails, and more particularly to a linear slide rail with a return system. Background Art

[0002] The return system of a linear slide rail generally includes rolling elements, a return channel, a return module, etc., and the return system of a linear slide rail is generally divided into an independent part combination method and an integrally formed method.

[0003] For the return system with an independent part combination method, reference can be made to the Taiwan, China patent publication number "TWI422762". Refer to Figure 1A-1B , in this design, the first turning path R1 is formed by a first return pipe 91, a first return part 92, and a first channel 93, and the rollers W installed in the first turning path R1 are poured through a first roller installation hole 911 penetrating through the first return pipe 91. Another reference Figure 2A-2B As shown, a cover plate J is further covered outside the first return pipe 91, and the turning part J1 of the cover plate J completely closes the first roller installation hole 911. After covering the cover plate J, reference can be made to Figure 3A-3B As shown, a second return pipe 97, a second return part 98, and the turning part J2 of the cover plate J form a second turning path R2, and a second roller installation hole J21 is opened on the turning part J2. The rollers W installed in the second turning path R2 are poured through the second roller installation hole J21.

[0004] However, in this design, during assembly, it is necessary to first pour the two rows of rollers W placed in the first turning path R1, then cover the cover plate J to close the first roller installation hole 911 before the other two rows of rollers W can be poured through the second roller installation hole J21. Finally, the end caps are installed. In this way, the problem of being unable to pour four rows of rollers simultaneously will occur, which will increase the assembly process and prolong the assembly time. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a roller type linear slide rail, and its main purpose is to solve the problem that four rows of rollers cannot be poured at one time on the same side of the slider, resulting in poor assembly efficiency.

[0006] To achieve the foregoing object, the roller type linear slide rail of the present invention includes:

[0007] A rail;

[0008] A slider, slidably sleeved on the rail, having a plurality of non-load channels, and the slider and the rail jointly form a plurality of load channels;

[0009] Two end cap units, installed at both ends of the slider, and the end cap units and the load channels and the non-load channels form a circulation path for a plurality of rolling elements to return. One of the end cap units includes:

[0010] A first cover plate is installed on the slider. The first cover plate has a plurality of through holes communicating with the non-load channels.

[0011] A second cover plate is installed on the other side of the first cover plate facing the slider. A first turning channel is formed between the second cover plate and the first cover plate. The first turning channel communicates with the load channel and the non-load channel. The second cover plate has a plurality of perforations respectively communicating with the through holes of the first cover plate.

[0012] An open end cover is installed at one end of the slider and is located on the other side of the second cover plate facing the first cover plate. A second turning channel is formed between the open end cover and the second cover plate. There is an included angle between the extending direction of the second turning channel and the extending direction of the first turning channel. The open end cover has a plurality of through holes respectively communicating with the perforations.

[0013] An outer end cover is installed on the open end cover to close the through holes.

[0014] As can be seen from the above, in the present invention, since the through holes of the open end cover, the perforations of the second cover plate, and the through holes of the first cover plate communicate with the non-load channels, the rolling elements can directly enter the non-load channels through the through holes, perforations, and through holes. Therefore, four rows of rolling elements can be filled at the same time, without turning over or filling the rolling elements in batches, thereby greatly reducing the assembly time and increasing the possibility of automation. Description of the Drawings

[0015] Figure 1A Schematic diagram of filling rollers into the first turning channel of a prior art roller type linear guide rail;

[0016] Figure 1B For Figure 1A Cross-sectional view;

[0017] Figure 2A Schematic diagram of a prior art roller type linear guide rail after covering the cover plate;

[0018] Figure 2B For Figure 2A Cross-sectional view;

[0019] Figure 3A Schematic diagram of filling rollers into the second turning channel of a prior art roller type linear guide rail;

[0020] Figure 3B For Figure 3A Cross-sectional view;

[0021] Figure 4 Three-dimensional view of the present invention;

[0022] Figure 5 Exploded view of the present invention;

[0023] Figure 6 This is a perspective view of the present invention, showing the first cover plate and the slider;

[0024] Figure 7 This is a perspective view of the present invention, showing another perspective of the first cover plate and the second cover plate;

[0025] Figure 8 This is a perspective view of the present invention, showing another perspective of the second cover plate and the open end cap;

[0026] Figure 9 This is a perspective view of the present invention, showing another perspective of the open end cap and the outer end cap;

[0027] Figure 10 This is a schematic diagram of the first cover plate of the present invention installed on the slider;

[0028] Figure 11 This is a schematic diagram of the second cover plate of the present invention installed outside the first cover plate;

[0029] Figure 12 This is a schematic diagram of the open end cap of the present invention covering the first cover plate and the second cover plate;

[0030] Figure 13 is Figure 11 Cross-sectional view 13-13 of

[0031] Figure 14 is Figure 11 Cross-sectional view 14-14 of

[0032] Figure 15 is Figure 4 Cross-sectional view 15-15 of

[0033] Figure 16 This is a perspective view of the second cover plate and the closed end cap installed at the second end of the slider;

[0034] Figure 17 This is an exploded view of another embodiment of the present invention.

[0035] Among them, the prior art:

[0036] The first return pipe 91

[0037] The first mounting hole 911

[0038] The first return part 92

[0039] The first channel 93

[0040] The first turning path R1

[0041] The second return pipe 97

[0042] Second reflux part 98

[0043] Second turning path R2

[0044] Cover plate J

[0045] Turning part J1

[0046] Rotating part J2

[0047] Second stud hole J21

[0048] Roller W;

[0049] The present invention:

[0050] Track 10

[0051] First rolling groove 11

[0052] Second rolling groove 12

[0053] Third rolling groove 13

[0054] Fourth rolling groove 14

[0055] Slider 20

[0056] First end 20A

[0057] Second end 20B

[0058] Non-load channel 21

[0059] First non-load channel 211

[0060] Second non-load channel 212

[0061] Third non-load channel 213

[0062] Fourth non-load channel 214

[0063] First rolling surface 221

[0064] Second rolling surface 222

[0065] Third rolling surface 223

[0066] Fourth rolling surface 224

[0067] Cage 30

[0068] First cover plate 40

[0069] Main body part 41

[0070] First rotating part 411

[0071] Inner side 41A

[0072] Outer side 41B

[0073] Return pipe 42

[0074] First return pipe 421

[0075] Second return pipe 422

[0076] Third return pipe 423

[0077] Fourth return pipe 424

[0078] Second cover plate 50

[0079] Inner corresponding side 51

[0080] First rotating surface 511

[0081] Outer corresponding side 52

[0082] Second rotating part 521

[0083] Perforation 53

[0084] First perforation 531

[0085] Second perforation 532

[0086] Third perforation 533

[0087] Fourth perforation 534

[0088] Open end cover 60

[0089] First side 61

[0090] Second rotating surface 611

[0091] Second side 62

[0092] Receiving groove 621

[0093] Through hole 63

[0094] First through hole 631

[0095] Second through hole 632

[0096] Third through hole 633

[0097] Fourth through hole 634

[0098] Outer end cover 70

[0099] Blocking part 71

[0100] First blocking part 71A

[0101] Second blocking part 71B

[0102] Guiding surface 711

[0103] First guiding surface 711A

[0104] Second guiding surface 711B

[0105] Connecting part 72

[0106] Closed end cap 80

[0107] Closed inner side 81

[0108] Curved part 82

[0109] Closed convex part 83

[0110] Fixing part C

[0111] Sliding direction X

[0112] First rotation direction Y1

[0113] Second rotation direction Y2

[0114] Load channel T

[0115] First load channel T1

[0116] Second load channel T2

[0117] Third load channel T3

[0118] Fourth load channel T4

[0119] Rolling element R

[0120] First rotation path K1

[0121] Second rotation path K2

[0122] Third rotation path K3

[0123] Through hole H

[0124] End cap unit Q. Detailed implementation mode

[0125] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0126] The present invention provides a roller type linear slide rail. In one embodiment, please refer to Figure 4-16 as shown, and includes:

[0127] An orbit 10, a slider 20 and two end cover units Q. Each of the end cover units Q is respectively installed at both ends of the slider 20. One of the end cover units Q includes a first cover plate 40, a second cover plate 50, an open end cover 60, and an outer end cover 70. The other end cover unit Q includes the first cover plate 40, the second cover plate 50 and a closed end cover 80, where:

[0128] The orbit 10 is an elongated member. The outer peripheral surface of the orbit 10 has a first rolling groove 11, a second rolling groove 12, a third rolling groove 13 and a fourth rolling groove 14.

[0129] The slider 20 is slidably sleeved on the orbit 10. The slider 20 is provided with four non-load channels 21 along a sliding direction X. These non-load channels 21 are defined as a first non-load channel 211, a second non-load channel 212, a third non-load channel 213, and a fourth non-load channel 214. The first non-load channel 211 is adjacent to the second non-load channel 212 and is located on one side of the slider 20. The third non-load channel 213 is adjacent to the fourth non-load channel 214 and is 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. The slider 20 defines a first end 20A and a second end 20B along the sliding direction X.

[0130] The slider 20 and the orbit 10 jointly form four load channels T. These load channels T are defined as a first load channel T1, a second load channel T2, a third load channel T3, and a fourth load channel T4. The first rolling groove 11 and the first rolling surface 221 jointly form the first load channel T1. The second rolling groove 12 and the second rolling surface 222 jointly form the second load channel T2. The third rolling groove 13 and the third rolling surface 223 jointly form the third load channel T3. The fourth rolling groove 14 and the fourth rolling surface 224 jointly form the fourth load channel T4.

[0131] Preferably, it further includes two cages 30. The two cages 30 are installed on the slider 20 to hold a plurality of rolling elements R. One of the cages 30 faces the first rolling surface 221 and the second rolling surface 222. The other cage 30 faces the third rolling surface 223 and the fourth rolling surface 224.

[0132] As Figure 5-7As shown, these first cover plates 40 have a main body portion 41 and four return pipes 42 connected to the main body portion 41. These return pipes 42 respectively penetrate through a through hole H, and these through holes H penetrate through the main body portion 41. One of the first cover plates 40 is disposed at the first end 20A of the slider 20, and another first cover plate 40 is disposed at the second end 20B of the slider 20. The main body portions 41 have an inner side 41A and an outer side 41B opposite to each other along the sliding direction X. These return pipes 42 are connected to the inner side 41A. Define these return pipes 42 as a first return pipe 421, a second return pipe 422, a third return pipe 423, and a fourth return pipe 424. The first return pipe 421 of the first cover plate 40 at the first end 20A is inserted into the first non-load channel 211, the second return pipe 422 is inserted into the second non-load channel 212, the third return pipe 423 is inserted into the third non-load channel 213, and the fourth return pipe 424 is inserted into the fourth non-load channel 214. The first return pipe 421 of the first cover plate 40 at the second end 20B is inserted into the third non-load channel 213 and is butted against the third return pipe 423 of the other first cover plate 40. The second return pipe 422 of the first cover plate 40 at the second end 20B is inserted into the fourth non-load channel 214 and is butted against the fourth return pipe 424 of the other first cover plate 40. The third return pipe 423 of the first cover plate 40 at the second end 20B is inserted into the first non-load channel 211 and is butted against the first return pipe 421 of the other first cover plate 40. The fourth return pipe 424 of the first cover plate 40 at the second end 20B is inserted into the second non-load channel 212 and is butted against the second return pipe 422 of the other first cover plate 40. Thus, the through holes H of these return pipes 42 are butted and communicated, and these through holes H are for accommodating these rolling elements R.

[0133] The outer side 41B of each main body portion 41 respectively has two first rotating portions 411. These two first rotating portions 411 extend along a first rotation direction Y1. One of the first rotating portions 411 is connected to the first return pipe 421, and the other first rotating portion 411 is connected to the fourth return pipe 424.

[0134] As Figure 5 、 7 shown, these second cover plates 50 are disposed on the outer side 41B of the first cover plate 40. These second cover plates 50 have an inner corresponding side 51 and an outer corresponding side 52 opposite to each other along the sliding direction X. The inner corresponding side 51 has two first rotating surfaces 511. These first rotating surfaces 511 are arc surfaces. These first rotating surfaces 511 extend along the first rotation direction Y1. These first rotating surfaces 511 face these first rotating portions 411 and jointly form a first rotation path K1;

[0135] Please refer toFigure 10 and 15 , one of the first turning paths K1 at the first end 20A communicates with the first non-load passage 211 and the second load passage T2, and the other first turning path K1 communicates with the fourth non-load passage 214 and the third load passage T3. One of the first turning paths K1 at the second end 20B communicates with the second non-load passage 212 and the first load passage T1, and the other first turning path K1 communicates with the third non-load passage 213 and the fourth load passage T4.

[0136] Please refer to Figure 7 , the second cover plate 50 has four through holes 53, and the holes 53 are respectively a first hole 531, a second hole 532, a third hole 533 and a fourth hole 534. The position of the first hole 531 corresponds to the first non-load passage 211, the position of the second hole 532 corresponds to the second non-load passage 212, the position of the third hole 533 corresponds to the third non-load passage 213, and the position of the fourth hole 534 corresponds to the fourth non-load passage 214. Please refer to Figure 8 , the outer corresponding side 52 has two second turning parts 521, and the two second turning parts 521 extend along a second turning direction Y2. There is an included angle between the second turning direction Y2 and the first turning direction Y1. Preferably, the second turning direction Y2 is perpendicular to the first turning direction Y1.

[0137] As Figure 5 and 8 shown in FIGS. 8 and 9, the open end cover 60 covers the first cover plate 40 and the second cover plate 50. The open end cover 60 is located at the first end 20A of the slider 20. The open end cover 60 has an opposite first side 61 and a second side 62 along the sliding direction X. The first side 61 faces the second cover plate 50, and the second side 62 faces away from the second cover plate 50. The first side 61 has two second turning surfaces 611, and the two second turning surfaces 611 extend along the second turning direction Y2. The second turning surfaces 611 are arc surfaces. The second turning surfaces 611 face the second turning parts 521 and together form a second turning path K2. Please refer to Figure 15 , the position of the second turning path K2 in the sliding direction X is different from the position of the first turning path K1 in the sliding direction X. The first turning path K1 is closer to the slider 20 than the second turning path K2. One of the second turning paths K2 communicates with the second non-load passage 212 and the first load passage T1, and the other second turning path K2 communicates with the third non-load passage 213 and the fourth load passage T4.

[0138] Please refer to Figure 8 and 9, the open end cap 60 has four through holes 63, which are respectively a first through hole 631, a second through hole 632, a third through hole 633 and a fourth through hole 634. The position of the first through hole 631 corresponds to the first perforation 531, the position of the second through hole 632 corresponds to the second perforation 532, the position of the third through hole 633 corresponds to the third perforation 533, the position of the fourth through hole 634 corresponds to the fourth perforation 534, and the second side 62 has a receiving groove 621.

[0139] As Figure 9 shown, the outer end cap 70 has four shielding portions 71, which respectively close the first through hole 631, the second through hole 632, the third through hole 633 and the fourth through hole 634. A connecting portion 72 is connected between two of the shielding portions 71 and the other two shielding portions 71. The connecting portion 72 is received in the receiving groove 621. In this embodiment, the shielding portions 71 are bumps, the shielding portions 71 extend along the sliding direction X, the shielding portions 71 respectively have a guiding surface 711, the guiding surfaces 711 are arc surfaces, the guiding surfaces 711 form the side walls of the first turning path K1 or the second turning path K2, and the guiding surfaces 711 are used to guide the rolling members R to turn.

[0140] In a preferred embodiment, please refer to Figure 9 , 15 , the shielding portions 71 can be further divided into two first shielding portions 71A and two second shielding portions 71B. The two first shielding portions 71A close the first through hole 631 and the fourth through hole 634, and the two second shielding portions 71B close the second through hole 632 and the third through hole 633. The length of the first shielding portion 71A along the sliding direction X is greater than the length of the second shielding portion 71B along the sliding direction X. The guiding surfaces 711 of the two first shielding portions 71A are first guiding surfaces 711A, and the first guiding surfaces 711A are the side walls of the first turning path K1. The guiding surfaces 711 of the two second shielding portions 71B are second guiding surfaces 711B, and the second guiding surfaces 711B are the side walls of the second turning path K2.

[0141] As Figure 5 , 16 shown, the closed end cap 80 covers the first cover plate 40 and the second cover plate 50. The closed end cap 80 is located at the second end 20B of the slider 20. The closed end cap 80 has a closed inner side 81, and the closed inner side 81 faces the second cover plate 50. The closed inner side 81 has two curved portions 82, and the curved portions 82 extend along the second turning direction Y2. The curved portions 82 face the second turning portions 521 and jointly form a third turning path K3 with the second turning portions 521. Please refer to Figure 15, the position of the third turning path K3 in the sliding direction X is different from the position of the first turning path K1 in the sliding direction X. The first turning path K1 is closer to the slider 20 than the third turning path K3. One of the third turning paths K3 communicates with the first non-load passage 211 and the second load passage T2, and the other third turning path K3 communicates with the fourth non-load passage 214 and the third load passage T3. The inner closed portion 81 further has two closed convex portions 83. One of the closed convex portions 83 closes the first through hole 531, and the other closed convex portion 83 closes the fourth through hole 534.

[0142] Preferably, please refer to Figure 5 , and further has two fixing members C. One of the fixing members C is locked to the open end cap 60 so that the outer end cap 70 is located between the fixing member C and the open end cap 60 to fix the outer end cap 70, and the other fixing member C is locked to the closed end cap 80 to fix the closed end cap 80.

[0143] In another embodiment of the present invention, please refer to Figure 17 , including:

[0144] A track 10, a slider 20, and two end cap units Q. Each end cap unit Q is respectively installed at both ends of the slider 20. The two end cap units Q respectively include a first cover plate 40, a second cover plate 50, an open end cap 60, and an outer end cap 70:

[0145] The slider 20 is slidably sleeved on the track 10 and has a plurality of non-load passages 21. The slider 20 and the track 10 jointly form a plurality of load passages T. The slider 20 defines a first end 20A and a second end 20B along the sliding direction X;

[0146] The first cover plates 40 are respectively installed at the first end 20A and the second end 20B of the slider 20. The first cover plate 40 has a plurality of through holes H communicating with the non-load passages 21;

[0147] The second cover plates 50 are respectively installed at the first end 20A and the second end 20B of the slider 20. The second cover plates 50 are respectively installed on the other side of the first cover plate 40 facing the slider 20. A first turning path K1 is formed between the second cover plate 50 and the first cover plate 40. The first turning path K1 communicates with the load passage T and the non-load passage 21. The second cover plate 50 has a plurality of through holes 53 respectively communicating with the through holes H of the first cover plate 40;

[0148] Two open end caps 60 are respectively installed on the first end 20A and the second end 20B of the slider 20. Each open end cap 60 is located on the other side of one of the second cover plates 50 facing the first cover plate 40. A second turning channel K2 is formed between the open end cap 60 and the second cover plate 50. The extending direction of the second turning channel K2 has an included angle with the extending direction of the first turning channel K1. The open end cap 60 has a plurality of through holes 63 respectively communicating with the through holes 53; and

[0149] Two outer end caps 70 are respectively installed on the open end caps 60 to close the through holes 63.

[0150] The above is the configuration description of the main components of each embodiment of the present invention. The operation mode and efficacy of the present invention are described as follows:

[0151] Please refer to Figure 10 、 15 , when the rolling elements R roll, they can move from the first non-load channel 211 to the first end 20A, and move through the first turning channel K1 to the second load channel T2. After moving to the second end 20B, they enter the first non-load channel 211 again through the third turning channel K3; Please refer to Figure 11 、 15 , the rolling elements R located in the second non-load channel 212 move to the first end 20A, and move through the second turning channel K2 to the first load channel T1. After moving to the second end 20B, they enter the second non-load channel 212 again through the first turning channel K1; The circulation modes of the rolling elements R in the third load channel T3, the fourth load channel T4, the third non-load channel 213, and the fourth non-load channel 214 are the same as those in the first load channel T1, the second load channel T2, the first non-load channel 211, and the second non-load channel 212, so they will not be elaborated.

[0152] Please refer to Figure 12 , in the present invention, since the through holes 63 of the open end cap 60, the through holes 53 of the second cover plate 50, the through holes H of the first cover plate 40 are communicated with the non-load channel 21, therefore, the rolling elements R can be directly poured into the non-load channel 21 through the through holes 63, the through holes 53, and the through holes H. Furthermore, four rows of rolling elements R can be poured in at the same time, without turning over or pouring the rolling elements R in batches, which can greatly reduce the assembly man-hours and improve the possibility of automation.

[0153] In addition, in the present invention, since the same first cover plate 40 and second cover plate 50 can be symmetrically installed at the first end 20A and the second end 20B of the slider 20, compared with the prior art where the component designs at the open end and the closed end are different, the mold opening cost can be saved, and the efficiency of automatic assembly can be improved.

[0154] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the layout type of the components may also be more complex.

[0155] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than being used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A roller linear guide rail, characterized in that Comprising: A track; A slider slidably sleeved on the track and having a plurality of non-load channels, and The slider and the track jointly form a plurality of load channels; Two end cap units are installed at both ends of the slider. The end cap units, the load channels and the non-load channels form a circulation path for a plurality of rolling elements to flow back. One of the end cap units includes: A first cover plate installed on the slider. The first cover plate has a plurality of through holes communicating with the non-load channels; A second cover plate installed on the other side of the first cover plate facing the slider. A first turning path is formed between the second cover plate and the first cover plate. The first turning path communicates with the load channel and the non-load channel. The second cover plate has a plurality of through holes respectively communicating with the through holes of the first cover plate; An open end cap is installed at one end of the slider and on the other side of the second cover plate facing the first cover plate. A second turning path is formed between the open end cap and the second cover plate. There is an included angle between the extending direction of the second turning path and the extending direction of the first turning path. The open end cap has a plurality of through holes respectively communicating with the through holes; An outer end cap is installed on the open end cap to close the through holes.

2. The roller linear guide rail according to claim 1, wherein: The extending direction of the second turning path is perpendicular to the extending direction of the first turning path.

3. The roller linear slide rail according to claim 1, characterized in that: The other end cap unit includes a first cover plate, a second cover plate and a closed end cap.

4. The roller linear slide rail according to claim 1, wherein: The other end cap unit includes a first cover plate, a second cover plate, an open end cap and an outer end cap.

5. The roller linear slide rail according to claim 3, wherein: The slider is provided with four rolling surfaces along a sliding direction. The slider defines a first end and a second end along the sliding direction. The non-load channels penetrate through the first end and the second end of the slider; The outer peripheral surface of the track has a plurality of opposite rolling grooves. The rolling grooves and the rolling surfaces jointly form the load channels. The number of the load channels and the non-load channels is four; One of the first cover plates is placed at the first end of the slider, and the other first cover plate is placed at the second end of the slider. The first cover plates have a main body portion and four return pipes connected to the main body portion and communicating with the through holes. The main body portions have an inner side and an outer side opposite to each other along the sliding direction. The return pipes are connected to the inner side and are respectively inserted into the non-load channels. The outer side of the main body portion has two first turning portions; The second cover plates are respectively placed on the outer sides of the first cover plates. The second cover plates have an inner corresponding side and an outer corresponding side opposite to each other along the sliding direction. The inner corresponding side has two first turning surfaces. The first turning surfaces face the first turning portions and jointly form the first turning paths. The outer corresponding side has two second turning portions. The number of the through holes on the second cover plates is four; The open end cap is located at the first end. The open end cap has a first side facing the second cover plate. The first side has two second turning surfaces. The second turning surfaces face the second turning portions and jointly form the second turning paths. The number of the through holes is four.

6. The roller linear slide rail according to claim 5, wherein: Define these non-load channels as a first non-load channel, a second non-load channel, a third non-load channel, and a fourth non-load channel, and define these load channels as a first load channel, a second load channel, a third load channel, and a fourth load channel; Define these return pipes as a first return pipe, a second return pipe, a third return pipe, and a fourth return pipe. The first return pipe of the first cover plate at the first end is inserted into the first non-load channel, the second return pipe is inserted into the second non-load channel, the third return pipe is inserted into the third non-load channel, and the fourth return pipe is inserted into the fourth non-load channel. The first return pipe of the first cover plate at the second end is inserted into the third non-load channel, the second return pipe is inserted into the fourth non-load channel, the third return pipe is inserted into the first non-load channel, and the fourth return pipe is inserted into the second non-load channel; The number of the first turning paths at the first end is two. One of the first turning paths is communicated with the first non-load channel and the second load channel, and the other first turning path is communicated with the fourth non-load channel and the third load channel. The number of the first turning paths at the second end is two. One of the first turning paths is communicated with the second non-load channel and the first load channel, and the other first turning path is communicated with the third non-load channel and the fourth load channel; The number of the second turning paths is two. One of the second turning paths is communicated with the second non-load channel and the first load channel, and the other second turning path is communicated with the third non-load channel and the fourth load channel.

7. The roller linear slide rail according to claim 5, wherein: These first turning surfaces and these first turning parts extend along a first turning direction, and these second turning surfaces and these second turning parts extend along a second turning direction. The first turning direction and the second turning direction are perpendicular.

8. The roller linear slide rail according to claim 5, wherein: The outer end cover has four shielding parts. These shielding parts respectively close the through holes. These shielding parts extend along the sliding direction. These shielding parts are divided into two first shielding parts and two second shielding parts. The length of the first shielding part along the sliding direction is greater than the length of the second shielding part along the sliding direction. These shielding parts have a guiding surface. These guiding surfaces are arc surfaces and are used to guide the rolling elements to turn. The guiding surface of these first shielding parts is the first guiding surface, and the guiding surface of these second shielding parts is the second guiding surface. The first guiding surface is the side wall of the first turning path, and the second guiding surface is the side wall of the second turning path.

9. The roller linear slide rail according to claim 5, wherein: The closed end cover is located at the second end. The closed end cover has a closed inner side facing the second cover plate. The closed inner side has two curved parts and two closed convex parts. These curved parts face these second turning parts and jointly form two third turning paths. One of the third turning paths is communicated with the first non-load channel and the second load channel, and the other third turning path is communicated with the fourth non-load channel and the third load channel. These closed convex parts close the perforations.

10. The roller linear slide rail according to claim 8, wherein: The open end cover has a second side opposite to the first side. The second side has a receiving groove. A connecting part is connected between two of these shielding parts and the other two of these shielding parts. The connecting part is received in the receiving groove.

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