Linear rail

Abstract

The utility model discloses a linear rail. The linear rail comprises a guide rail, a sliding block and a roller assembly. The guide rail is provided with an upper surface, a first groove and a second groove are formed in the two sides, in the width direction of the guide rail, of the guide rail, and the first groove and the second groove extend in the extending direction of the guide rail. The sliding block is arranged on the guide rail in a sliding mode, the sliding block is provided with a first surface opposite to the upper surface, a static pressure cavity is formed in the first surface, and the sliding block is provided with a first protruding section matched with the first groove and a second protruding section matched with the second groove. The number of the roller assemblies is at least two, one of the roller assemblies is arranged on the first groove or the first protruding section, and the other roller assembly is arranged on the second groove or the second protruding section. The problem that in the prior art, a pin roller is prone to damage is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-precision machining machine tool parts, in particular to a linear rail. BACKGROUND

[0002] Chinese patent CN202388233U discloses a static pressure rolling composite guide rail, which improves the precision and service life of the static pressure rolling composite guide rail by setting a roller on the static pressure cavity.

[0003] However, since the roller is set on the static pressure cavity in the prior art, when the static pressure rolling composite guide rail is subjected to a large external force impact, the stress between the roller and the guide rail is too large, thereby easily causing damage to the roller. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a linear rail to at least solve the problem that the roller is easily damaged in the prior art.

[0005] According to one aspect of the present application, a linear rail is provided, comprising:

[0006] a guide rail having an upper surface, the guide rail being provided with a first groove and a second groove on both sides of its width direction, the first groove and the second groove both extending along the extension direction of the guide rail;

[0007] a sliding block slidably arranged on the guide rail, the sliding block having a first surface arranged opposite to the upper surface, the first surface being provided with a static pressure cavity, the sliding block being provided with a first protruding section adapted to the first groove and a second protruding section adapted to the second groove;

[0008] a roller assembly comprising at least two rollers, one of which is arranged on the first groove or the first protruding section, and the other is arranged on the second groove or the second protruding section.

[0009] Further, the first groove comprises a first side wall surface close to the upper surface, a second side wall surface away from the upper surface, and a first groove bottom surface connected between the first side wall surface and the second side wall surface, and the second groove comprises a third side wall surface close to the upper surface, a fourth side wall surface away from the upper surface, and a second groove bottom surface connected between the third side wall surface and the fourth side wall surface.

[0010] The first protruding segment has a first surface opposite to the first side wall, a second surface opposite to the bottom surface of the first groove, and a third surface opposite to the second side wall; the second protruding segment has a fourth surface opposite to the third side wall, a fifth surface opposite to the bottom surface of the second groove, and a sixth surface opposite to the fourth side wall.

[0011] The first surface, the third surface, the fourth surface, and the sixth surface are each provided with a roller assembly.

[0012] Furthermore, the first surface has a first receiving groove, the third surface has a second receiving groove, the fourth surface has a third receiving groove, and the sixth surface has a fourth receiving groove. Each of the first receiving groove, the second receiving groove, the third receiving groove, and the fourth receiving groove is provided with a roller assembly.

[0013] Furthermore, the plane on which the second surface is located is perpendicular to the first surface, and the plane on which the fifth surface is located is perpendicular to the first surface;

[0014] The included angle A between the first face and the second face satisfies the following relationship: 130°≤A≤140°; the included angle B between the third face and the second face satisfies the following relationship: 130°≤B≤140°; the included angle C between the fourth face and the fifth face satisfies the following relationship: 130°≤C≤140°; and the included angle D between the sixth face and the fifth face satisfies the following relationship: 130°≤D≤140°.

[0015] Furthermore, a first gap exists between the bottom surface of the first groove and the second surface. Along the direction from the bottom surface of the first groove towards the second surface, the minimum width L1 of the first gap satisfies the relationship: 0.02mm ≤ L1 ≤ 0.03mm; and / or,

[0016] There is a second gap between the bottom surface of the second groove and the fifth surface. Along the direction of the bottom surface of the second groove close to the fifth surface, the minimum width L2 of the second gap satisfies the relationship: 0.02mm≤L2≤0.03mm.

[0017] Further, the roller assembly includes:

[0018] A support frame extends a predetermined length along the extension direction of the guide rail, and the support frame has multiple mounting slots along its own extension direction;

[0019] The rollers include a plurality of rollers, which are rotatably disposed in a plurality of mounting slots in a one-to-one correspondence.

[0020] Furthermore, the slider includes:

[0021] The main body has a static pressure chamber disposed thereon, and an oil supply channel is provided on the main body, which is connected to the static pressure chamber.

[0022] A first end plate is connected to the first side of the main body along the extension direction of the guide rail. An oil inlet channel is provided on the first end plate, and the oil inlet channel is connected to the oil supply channel.

[0023] The second end plate is connected to the second side of the main body along the extension direction of the guide rail, and the two ends of the roller assembly are fixed between the first end plate and the second end plate.

[0024] Furthermore, a capillary throttling device is embedded in the oil inlet channel.

[0025] Furthermore, a first limiting groove is provided on the first end plate, and a second limiting groove is provided on the second end plate, with both ends of the roller assembly respectively disposed in the first limiting groove and the second limiting groove.

[0026] Furthermore, the guide rail includes:

[0027] The body has a plurality of mounting holes spaced apart along its own extension direction. The mounting holes penetrate the body along the height direction of the linear guide. The first groove and the second groove are provided on the body.

[0028] A cover body, which is placed on the body body, with the upper surface located on the top surface of the cover body.

[0029] Compared to existing technologies, in this application, when the linear guide has a small load, the pressure on the oil in the hydrostatic chamber is low, and the oil film between the first and upper surfaces is thicker. This oil film provides less support to the slider, and the roller assembly primarily provides support under low loads. Because the load on the roller assembly is small, it is less prone to deformation and damage. However, when the load on the linear guide is large, the oil pressure in the hydrostatic chamber increases, causing the oil film thickness between the first and upper surfaces to decrease and the oil film stiffness to increase. At this point, the oil film pressure balances part of the load force, resulting in lower pressure transmitted to the roller assembly, thus preventing damage to the roller assembly due to a large load. Furthermore, during operation, the oil in the hydrostatic chamber of the linear guide rail has a cooling effect. Specifically, after the external oil supply component is connected to the hydrostatic chamber, the component continuously supplies oil. The oil flows into the hydrostatic chamber and directly contacts the slider and guide rail, carrying away heat from them. Subsequently, under gravity, the oil flows onto the roller assembly, carrying away heat from the roller assembly, thereby reducing the temperature of the linear guide rail and increasing its service life. Compared to existing technologies, the linear guide rail of this application improves its impact resistance and further extends its service life. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the linear track disclosed in this application from a first-person perspective.

[0032] Figure 2 This is a schematic diagram of the guide rail structure disclosed in this application;

[0033] Figure 3 This is a schematic diagram of the exploded structure of the guide rail disclosed in this application;

[0034] Figure 4 This is a schematic diagram of the assembly of the slider, roller assembly and oil passage connector disclosed in this application, viewed from a first perspective.

[0035] Figure 5 A schematic diagram of the assembly of the slider and oil circuit connector disclosed in this application, viewed from a second perspective;

[0036] Figure 6 This is a schematic diagram of the assembly of the slider, roller assembly and oil passage connector disclosed in this application, viewed from a third-person perspective.

[0037] Figure 7 A schematic diagram of the assembly of the slider and oil circuit connector disclosed in this application, viewed from a third-person perspective;

[0038] Figure 8 This is a schematic diagram of the linear track disclosed in this application from a fourth-person perspective.

[0039] Figure 9 This is an exploded structural diagram of the slider, roller assembly and oil passage connector disclosed in this application from a fifth-person perspective.

[0040] Figure 10 This is an exploded structural diagram of the slider, roller assembly and oil passage connector disclosed in this application from a fifth-person perspective.

[0041] Figure 11 This is an exploded structural diagram of the first end plate, capillary throttle, and oil circuit connector disclosed in this application;

[0042] Figure 12 This is an exploded structural diagram of the roller assembly disclosed in this application.

[0043] The above figures include the following reference numerals:

[0044] 10. Guide rail; 11. Body; 12. Cover; 20. Slider; 21. First surface; 22. First protruding section; 23. Second protruding section; 30. Roller assembly; 31. Support frame; 32. Roller; 40. Oil circuit connector; 50. Sealing ring; 60. Capillary throttle; 71. First gap; 72. Second gap; 101. First groove; 102. Second groove; 111. Assembly hole; 121. Upper surface; 201. Body; 202. First end plate; 203. Second end plate; 211. Static pressure chamber; 221. First surface; 222. Second surface; 223. Three sides; 231, fourth side; 232, fifth side; 233, sixth side; 310, mounting groove; 311, first protrusion; 312, second protrusion; 1011, first side wall; 1012, bottom surface of the first groove; 1013, second side wall; 1021, third side wall; 1022, bottom surface of the second groove; 1023, fourth side wall; 2011, oil supply channel; 2021, oil inlet channel; 2022, first limiting groove; 2031, second limiting groove; 2211, first receiving groove; 2231, second receiving groove; 2311, third receiving groove; 2331, fourth receiving groove. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] Existing linear guides include roller linear guides and hydrostatic linear guides. In roller linear guides, the slider 20 and guide rail 10 are slidably connected by rollers 32, thereby reducing the friction between the slider 20 and guide rail 10 and providing higher precision and service life. Hydrostatic linear guides, by setting hydrostatic cavities 211 on the slider 20 or guide rail 10, create an oil film between the guide rail 10 and slider 20, which greatly reduces the friction between the guide rail 10 and slider 20 and provides higher precision. The advantages of roller linear guides are simple structure and low manufacturing cost, while the advantages of hydrostatic linear guides are high load-bearing capacity and higher control precision. The disadvantage of roller linear guides is that when the linear guide is subjected to large pressure, the stress between the rollers 32 and guide rail 10 is too large, causing the rollers 32 to be prone to deformation and damage. The disadvantage of hydrostatic linear guides is that too many hydrostatic cavities 211 are opened between the guide rail 10 and slider 20, requiring more oil circuit settings, resulting in an overly complex structure and high manufacturing cost. Therefore, in order to combine the advantages of both and avoid their disadvantages, this application proposes a linear guide. See also Figures 1 to 12 As shown, the linear guide of this application includes a guide rail 10, a slider 20, and a roller assembly 30.

[0049] The guide rail 10 has an upper surface 121. A first groove 101 and a second groove 102 are formed on both sides of the guide rail 10 along its width direction. Both the first groove 101 and the second groove 102 extend along the extension direction of the guide rail 10. A slider 20 is slidably mounted on the guide rail 10. The slider 20 has a first surface 21 opposite to the upper surface 121, and a hydrostatic cavity 211 is formed on the first surface 21. The slider 20 has a first protrusion 22 adapted to the first groove 101 and a second protrusion 23 adapted to the second groove 102. The roller assembly 30 includes at least two rollers, one of which is disposed on the first groove 101 or the first protrusion 22, and the other is disposed on the second groove 102 or the second protrusion 23.

[0050] Specifically, linear guides are typically used in conjunction with the machine tool's worktable. The worktable is mounted on top of the slider 20, and the slider 20 slides on the linear guide, thereby moving the worktable. When the machine tool needs to process a workpiece, the workpiece is placed on the processing table, and the linear guide drives the worktable to move, thus bringing the workpiece to the designated processing position. In this embodiment, a hydrostatic chamber 211 is provided on the first surface 21 of the slider 20. When oil is supplied to the hydrostatic chamber 211, an oil film forms between the first surface 21 of the slider 20 and the upper surface 121 of the guide rail 10, thereby preventing direct contact between the first surface 21 of the slider 20 and the upper surface 121 of the guide rail 10, which would otherwise result in excessive friction between the slider 20 and the guide rail 10. Meanwhile, a roller assembly 30 is provided in the first protrusion 22 or the first groove 101, and a roller assembly 30 is provided in the second groove 102 or the second protrusion 23. The roller assembly 30 makes the contact between the first protrusion 22 and the first groove 101, and the contact between the second protrusion 23 and the second groove 102 a rolling contact, which reduces the sliding friction between the slider 20 and the guide rail 10.

[0051] In the prior art, since the roller assembly 30 is directly mounted on the static pressure chamber 211, when the linear guide is subjected to a large load or a large external force impacts the linear guide, the pressure on the roller 32 will increase, which may eventually lead to deformation and damage of the roller 32. Compared with the prior art, in this embodiment, when the linear guide has a small load, the pressure on the oil in the static pressure chamber 211 is small, and the oil film between the first surface 21 and the upper surface 121 is thicker. The oil film provides less support for the slider 20, and the roller assembly 30 mainly provides support under low load. Because the roller assembly 30 is subjected to a small load, it is not easy to deform and be damaged. However, when the load on the linear guide is large, the oil pressure in the static pressure chamber 211 increases, which reduces the thickness of the oil film between the first surface 21 and the upper surface 121 and increases the stiffness of the oil film. At this time, after the oil film pressure balances part of the load force, the pressure transmitted to the roller assembly 30 is small, thus avoiding damage to the roller assembly 30 due to a large load. Furthermore, during operation, the oil in the static pressure chamber 211 cools the linear guide. Specifically, after the external oil supply component connects to the static pressure chamber 211, it continuously supplies oil. The oil flows into the static pressure chamber 211 and directly contacts the slider 20 and guide rail 10, carrying away heat from them. Subsequently, under gravity, the oil flows into the roller assembly 30, carrying away heat from the roller assembly 30, thereby reducing the linear guide's temperature and increasing its service life. Compared to existing technologies, the linear guide in this embodiment improves its impact resistance and further extends its service life.

[0052] Further, the first groove 101 includes a first sidewall 1011 surface near the upper surface 121, a second sidewall 1013 surface away from the upper surface 121, and a first groove bottom surface 1012 connecting the first sidewall 1011 surface and the second sidewall 1013 surface; the second groove 102 includes a third sidewall 1021 surface near the upper surface 121, a fourth sidewall 1023 surface away from the upper surface 121, and a second groove bottom surface 1022 connecting the third sidewall 1021 surface and the fourth sidewall 1023 surface; the first protrusion 22 has a surface that is adjacent to the first sidewall 1011 surface. The second protruding section 23 has a first surface 221 opposite to the wall 1011, a second surface 222 opposite to the bottom surface 1012 of the first groove, and a third surface 223 opposite to the second side wall 1013. The second protruding section 23 has a fourth surface 231 opposite to the third side wall 1021, a fifth surface 232 opposite to the bottom surface 1022 of the second groove, and a sixth surface 233 opposite to the fourth side wall 1023. A roller assembly 30 is provided on each of the first surface 221, the third surface 223, the fourth surface 231, and the sixth surface 233.

[0053] Specifically, a roller assembly 30 is provided on the first surface 221, the third surface 223, the fourth surface 231, and the sixth surface 233, so that the first side wall 1011 of the guide rail 10 is in rolling contact with the first surface 221, the second side wall 1013 is in rolling contact with the third surface 223, the third side wall 1021 is in rolling contact with the fourth surface 231, and the fourth side wall 1023 is in rolling contact with the sixth surface 233, thereby avoiding direct contact between the guide rail 10 and the slider 20, which would result in excessive friction between the slider 20 and the guide rail 10. In some embodiments, roller assemblies 30 can be provided only on the first surface 221 and the fourth surface 231 to enable rolling contact between the guide rail 10 and the slider 20. However, when the slider 20 wobbles on the guide rail 10, the third surface 223 and the second side wall 1013, and the sixth surface 233 and the fourth side wall 1023 may come into direct contact, which will increase the friction between the slider 20 and the guide rail 10 and reduce the motion accuracy of the linear guide. Therefore, roller assemblies 30 need to be provided between the third surface 223 and the second side wall 1013 and the sixth surface 233 and the fourth side wall 1023 to improve the motion stability and motion accuracy of the linear guide.

[0054] Furthermore, the first surface 221 has a first receiving groove 2211, the third surface 223 has a second receiving groove 2231, the fourth surface 231 has a third receiving groove 2311, and the sixth surface 233 has a fourth receiving groove 2331. A roller assembly 30 is provided in each of the first receiving groove 2211, the second receiving groove 2231, the third receiving groove 2311, and the fourth receiving groove 2331.

[0055] In practice, after the roller assembly 30 is installed, the roller assembly 30 in the first receiving groove 2211 protrudes from the first surface 221, the roller assembly 30 in the second receiving groove 2231 protrudes from the third surface 223, the roller assembly 30 in the third receiving groove 2311 protrudes from the fourth surface 231, and the roller assembly 30 in the fourth receiving groove 2331 protrudes from the sixth surface 233. This prevents direct contact between the first surface 221 and the first side wall 1011, the third surface 223 and the second side wall 1013, the fourth surface 231 and the third side wall 1021, and the sixth surface 233 and the fifth side wall. Furthermore, the design of the first receiving groove 2211, the second receiving groove 2231, the third receiving groove 2311, and the fourth receiving groove 2331 improves the connection stability of the roller assembly 30, preventing relative displacement between the roller assembly 30 and the slider 20 during movement, thus avoiding a decrease in the movement accuracy of the slider 20.

[0056] Furthermore, the plane on which the second surface 222 is located is perpendicular to the first surface 21, and the plane on which the fifth surface 232 is located is perpendicular to the first surface 21; wherein, the angle A between the first surface 221 and the second surface 222 satisfies the relationship: 130°≤A≤140°, the angle B between the third surface 223 and the second surface 222 satisfies the relationship: 130°≤B≤140°, the angle C between the fourth surface 231 and the fifth surface 232 satisfies the relationship: 130°≤C≤140°, and the angle D between the sixth surface 233 and the fifth surface 232 satisfies the relationship: 130°≤D≤140°.

[0057] In this embodiment, when the included angle A between the first surface 221 and the second surface 222 is too small, for example, A is less than 130°, the normal pressure on the roller assembly 30 on the first surface 221 increases. If the load on the linear guide is too large, it may cause damage to the roller assembly 30 on the first surface 221. If A is greater than 140°, the contact between the roller assembly 30 and the first sidewall 1011 changes from surface contact to point contact, which in turn causes excessive stress in some areas of the roller assembly 30, leading to damage to the roller assembly. Similarly, if B is greater than 140°, or C is greater than 140°, or D is greater than 140°, the contact between the corresponding roller assembly 30 and the guide rail may also change from surface contact to point contact. If B is less than 130°, the load on the roller assembly 30 on the third surface 223 increases; if C is less than 130°, the load on the roller assembly 30 on the fourth surface 231 increases; and if D is less than 130°, the load on the roller assembly 30 on the sixth surface 233 increases. The angles A, B, C, and D can be 130°, 132°, 134°, 136°, 138°, and 140°. In a preferred embodiment, the values ​​of A, B, C, and D are all 135°.

[0058] As attached Figure 8As shown, a first gap 71 exists between the bottom surface 1012 of the first groove and the second surface 222. Along the direction of the bottom surface 1012 of the first groove closer to the second surface 222, the minimum width L1 of the first gap 71 satisfies the relationship: 0.02mm ≤ L1 ≤ 0.03mm. Further, a second gap 72 exists between the bottom surface 1022 of the second groove and the fifth surface 232. Along the direction of the bottom surface 1022 of the second groove closer to the fifth surface 232, the minimum width L2 of the second gap 72 satisfies the relationship: 0.02mm ≤ L2 ≤ 0.03mm.

[0059] Specifically, because roller assemblies 30 are provided on the first surface 221, the third surface 223, the fourth surface 231, and the sixth surface 233, a first gap 71 exists between the bottom surface 1012 of the first groove and the second surface 222, and a second gap 72 exists between the bottom surface 1022 of the second groove and the fifth surface 232. The existence of the first gap 71 prevents the bottom surface 1012 of the first groove from directly contacting the second surface 222, and similarly, the existence of the second gap 72 prevents the bottom surface 1022 of the second groove from directly contacting the second surface 222. During assembly, the minimum width L1 of the first gap 71 should be made to satisfy the above relationship as much as possible. If L1 is too small, i.e., L1 is greater than 0.02mm, it may cause the bottom surface 1012 of the first groove to directly contact the second surface 222 when the slider 20 shakes. If L1 is too large, i.e., L1 is greater than 0.03mm, the depth of the first groove 101 needs to be increased during the design process. This will lead to a decrease in the structural strength of the guide rail 10, or the distance of the first protrusion 22 along the protrusion near the first groove 101 needs to be reduced. This will result in a reduction in the size of the first surface 221 and the third surface 223, making it difficult to install the roller assembly 30 on the first surface 221 and the third surface 223. Similarly, the minimum width L1 of the second gap 72 should also satisfy the above relationship. In this embodiment, the values ​​of L1 and L2 can be 0.02mm, 0.021mm, 0.022mm, 0.023mm, 0.024mm, 0.025mm, 0.026mm, 0.027mm, 0.028mm, 0.029mm, and 0.03mm.

[0060] See appendix Figure 12 The roller assembly 30 includes a support frame 31 and rollers 32. The support frame 31 extends a predetermined length along the extension direction of the guide rail 10, and the support frame 31 has multiple mounting slots 310 along its own extension direction. The rollers 32 include multiple rollers, which are rotatably disposed in the multiple mounting slots 310 in a one-to-one correspondence.

[0061] Specifically, when installing the roller assembly 30, each roller 32 is first installed in the mounting groove 310 of the support frame 31, and then each support frame 31 is installed in the first receiving groove 2211, the second receiving groove 2231, the third receiving groove 2311, and the fourth receiving groove 2331, respectively. In this embodiment, the arrangement of multiple rollers 32 and multiple mounting grooves 310 increases the rolling contact area between the roller assembly 30 and the guide rail 10, thereby reducing the friction between the guide rail 10 and the slider 20.

[0062] Further, the slider 20 includes a main body 201, a first end plate 202, and a second end plate 203. A static pressure chamber 211 is disposed on the main body 201, and an oil supply channel 2011 is provided on the main body 201, communicating with the static pressure chamber 211. The first end plate 202 is connected to a first side of the main body 201 extending along the guide rail 10, and an oil inlet channel 2021 is provided on the first end plate 202, communicating with the oil supply channel 2011. The second end plate 203 is connected to a second side of the main body 201 extending along the guide rail 10, and both ends of the roller assembly 30 are fixed between the first end plate 202 and the second end plate 203.

[0063] Specifically, after the external oil supply component connects with the oil inlet channel 2021 on the first end plate 202, the oil inlet channel 2021 and the oil supply channel 2011 enter the static pressure chamber 211, thereby generating an oil film between the first surface 21 and the upper surface 121. In this embodiment, the arrangement of the first end plate 202 and the second end plate 203 allows the two ends of the support frame 31 to be fixed on the first end plate 202 and the second end plate 203 respectively, thereby improving the stability of the support frame 31. In addition, the oil circuit can enter the static pressure chamber 211 through the oil inlet channel 2021 on the first end plate 202. In some embodiments, the oil inlet channel 2021 is opened on the first side of the main body 201 along the extension direction of the guide rail 10. The slider 20 also includes a sealing ring 50, which is disposed in the oil supply channel 2011. When the first end plate 202 is connected to the main body 201, the oil inlet channel 2021 is connected to the oil supply channel 2011, and the sealing ring 50 is located between the oil inlet channel 2021 and the oil supply channel 2011 to prevent oil from flowing out from the gap between the oil inlet channel 2021 and the oil supply channel 2011.

[0064] In addition, a capillary throttle 60 is embedded in the oil inlet channel 2021. In this embodiment, the capillary throttle 60 can adjust the stiffness of the oil film in the static pressure chamber 211. Compared with existing linear guides that use diaphragm-type throttles, the small size of the capillary throttle 60 improves the space utilization of the linear guide to a certain extent. In some embodiments, the linear guide also includes an oil line connector 40. During assembly, the capillary throttle 60 is first installed on the oil line connector 40, and then the oil line connector 40 is connected to the oil inlet channel 2021.

[0065] Furthermore, a first limiting groove 2022 is provided on the first end plate 202, and a second limiting groove 2031 is provided on the second end plate 203. The two ends of the roller assembly 30 are respectively located in the first limiting groove 2022 and the second limiting groove 2031.

[0066] Specifically, the support frame 31 has a first protrusion 311 at the end near the first end plate 202 and a second protrusion 312 at the end near the second end plate 203. The first protrusion 311 engages with the first limiting groove 2022, and the second protrusion 312 engages with the second limiting groove 2031, thereby fixing the support frame 31 between the first end plate 202 and the second end plate 203. In a specific embodiment, the first end plate 202 has four first limiting grooves 2022, and the second end plate 203 has four second limiting grooves 2031. The four first limiting grooves 2022 and the four second limiting grooves 2031 are respectively used to fix the support frame 31 on the first surface 221, the third surface 223, the fourth surface 231, and the sixth surface 233.

[0067] Furthermore, the guide rail 10 includes a body 11 and a cover 12. The body 11 has a plurality of mounting holes 111 spaced apart along its extension direction, and the mounting holes 111 penetrate the body 11 along the height direction of the guide rail. A first groove 101 and a second groove 102 are provided on the body 11. The cover 12 covers the body 11, and the upper surface 121 is located on the top surface of the cover 12.

[0068] In this embodiment, the mounting hole 111 on the body 11 is used to fix the guide rail 10. That is, bolts or other fasteners can be used to fix the guide rail 10 to a specific component through the mounting hole 111. However, since a static pressure chamber 211 is provided on the first surface 21 in this embodiment, in order to prevent the oil in the static pressure chamber 211 from entering the mounting hole 111 and causing contamination to the mounting hole 111 or the specific component, the guide rail 10 also includes a cover 12. The cover 12 is placed on the body 11 to prevent oil from entering the mounting hole 111 or entering the specific component through the mounting hole 111.

[0069] In summary, the linear guide of this application improves the overall performance of the linear guide by combining the characteristics of hydrostatic linear guides and roller linear guides. Furthermore, thanks to the positional design of the hydrostatic chamber 211 and the roller assembly 30, when the load on the linear guide is large or when the linear guide is subjected to a large external impact, the oil film on the hydrostatic chamber 211 can offset most of the load through oil pressure, thereby preventing excessive pressure transmitted to the roller assembly 30 and avoiding damage to the roller assembly 30. On the other hand, to enable the slider 20 to run more stably on the guide rail 10, roller assemblies 30 are provided on the first surface 221, the third surface 223, the fourth surface 231, and the sixth surface 233 in this application. This arrangement not only reduces the friction between the slider 20 and the guide rail 10, but also prevents direct contact between the third surface 223 and the second side wall 1013, and between the sixth surface 233 and the fourth side wall 1023, when the slider 20 shakes. In addition, this application also limits the angle A between the first surface 221 and the second surface 222, the angle B between the second surface 222 and the third surface 223, the angle C between the fourth surface 231 and the fifth surface 232, and the angle D between the fifth surface 232 and the sixth surface 233, so as to avoid the roller assembly 30 being subjected to excessive pressure when the linear guide is subjected to a large load, which would cause the roller assembly 30 to be damaged.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A linear guide rail, characterized in that, include: The guide rail (10) has an upper surface (121). The guide rail (10) has a first groove (101) and a second groove (102) on both sides along its width direction. The first groove (101) and the second groove (102) both extend along the extension direction of the guide rail (10). A slider (20) is slidably disposed on the guide rail (10). The slider (20) has a first surface (21) disposed opposite to the upper surface (121). A static pressure cavity (211) is formed on the first surface (21). The slider (20) has a first protrusion (22) adapted to the first groove (101) and a second protrusion (23) adapted to the second groove (102). The roller assembly (30) includes at least two roller assemblies, one of which is disposed on the first groove (101) or the first protrusion (22), and the other is disposed on the second groove (102) or the second protrusion (23).

2. The linear guide according to claim 1, characterized in that, The first groove (101) includes a first sidewall (1011) surface near the upper surface (121), a second sidewall (1013) surface away from the upper surface (121), and a first groove bottom surface (1012) connected between the first sidewall (1011) surface and the second sidewall (1013) surface. The second groove (102) includes a third sidewall (1021) surface near the upper surface (121), a fourth sidewall (1023) surface away from the upper surface (121), and a second groove bottom surface (1022) connected between the third sidewall (1021) surface and the fourth sidewall (1023) surface. The first protruding section (22) has a first surface (221) opposite to the first sidewall (1011), a second surface (222) opposite to the bottom surface (1012) of the first groove, and a third surface (223) opposite to the second sidewall (1013). The second protruding section (23) has a fourth surface (231) opposite to the third sidewall (1021), a fifth surface (232) opposite to the bottom surface (1022) of the second groove, and a sixth surface (233) opposite to the fourth sidewall (1023). A roller assembly (30) is provided on the first surface (221), the third surface (223), the fourth surface (231), and the sixth surface (233).

3. The linear guide according to claim 2, characterized in that, The first surface (221) has a first receiving groove (2211), the third surface (223) has a second receiving groove (2231), the fourth surface (231) has a third receiving groove (2311), and the sixth surface (233) has a fourth receiving groove (2331). Each of the first receiving groove (2211), the second receiving groove (2231), the third receiving groove (2311), and the fourth receiving groove (2331) is provided with a roller assembly (30).

4. The linear guide according to claim 2, characterized in that, The plane on which the second surface (222) is located is perpendicular to the first surface (21), and the plane on which the fifth surface (232) is located is perpendicular to the first surface (21); The included angle A between the first surface (221) and the second surface (222) satisfies the following relationship: 130° ≤A≤140°, the included angle B between the third surface (223) and the second surface (222) satisfies the relationship: 130° ≤B≤140°, the included angle C between the fourth surface (231) and the fifth surface (232) satisfies the relationship: 130° ≤C≤140°, the included angle D between the sixth face (233) and the fifth face (232) satisfies the relationship: 130° ≤D≤140°。 5. The linear guide according to claim 2, characterized in that, There is a first gap (71) between the first groove bottom surface (1012) and the second surface (222). Along the direction of the first groove bottom surface (1012) approaching the second surface (222), the minimum width L1 of the first gap (71) satisfies the relationship: 0.02mm≤L1≤0.03mm; and / or, there is a second gap (72) between the second groove bottom surface (1022) and the fifth surface (232). Along the direction of the second groove bottom surface (1022) approaching the fifth surface (232), the minimum width L2 of the second gap (72) satisfies the relationship: 0.02mm≤L2≤0.03mm.

6. The linear guide according to any one of claims 1 to 5, characterized in that, The roller assembly (30) includes: The support frame (31) extends a predetermined length along the extension direction of the guide rail (10), and the support frame (31) has a plurality of mounting slots (310) along its own extension direction; Rollers (32), including multiple rollers (32), are rotatably disposed in multiple mounting slots (310) in a one-to-one correspondence.

7. The linear guide according to any one of claims 1 to 5, characterized in that, The slider (20) includes: The main body (201) has a static pressure chamber (211) disposed on the main body (201) and an oil supply channel (2011) is provided on the main body (201), the oil supply channel (2011) being connected to the static pressure chamber (211); A first end plate (202) is connected to the first side of the main body (201) along the extension direction of the guide rail (10). An oil inlet channel (2021) is provided on the first end plate (202), and the oil inlet channel (2021) is connected to the oil supply channel (2011). The second end plate (203) is connected to the second side of the main body (201) along the extension direction of the guide rail (10), and the two ends of the roller assembly (30) are fixed between the first end plate (202) and the second end plate (203).

8. The linear guide according to claim 7, characterized in that, The oil inlet channel (2021) is equipped with a capillary throttle (60).

9. The linear guide according to claim 7, characterized in that, The first end plate (202) has a first limiting groove (2022), and the second end plate (203) has a second limiting groove (2031). The two ends of the roller assembly (30) are respectively disposed in the first limiting groove (2022) and the second limiting groove (2031).

10. The linear guide according to any one of claims 1 to 5, characterized in that, The guide rail (10) includes: The body (11) has a plurality of mounting holes (111) spaced apart along its own extension direction. The mounting holes (111) penetrate the body (11) along the height direction of the rail. The first groove (101) and the second groove (102) are provided on the body (11). A cover (12) is placed on the body (11), and the upper surface (121) is located on the top surface of the cover (12).

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