Rolling linear guide rail pair
By designing a steering groove that can accommodate the convex edges and a linear guide area extending outward in the rolling linear guide pair, combining the upper limit bar, the middle limit bar and the lower limit bar, the problem of lag during the movement of the ball assembly is solved, and the smooth operation of the ball assembly is achieved.
Patent Information
- Application Number
- CN202421536641.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-01
AI Technical Summary
Ball components are prone to lag during movement, mainly due to the step problems caused by the loss of positional limitations during rotation and the manufacturing error of parts.
A rolling linear guide rail pair is designed, adopting a steering groove that can accommodate the convex edges and a linear guide area extending outwardly. Combining the upper limit bar, the middle limit bar and the lower limit bar, it avoids scratching and contact between the chain and the semi-cylinder, and provides a space for adjustment and guidance for the ball assembly.
It effectively avoids scratching and contact between the limit convex sides of the two sides of the maintaining chain and the semi-cylindrical, ensuring that the ball assembly can run smoothly when the rotational movement is converted into linear motion, and even when the steps appear after the parts are assembled, it can ensure the smooth passage of the ball assembly.
Smart Images
Figure CN222843523U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a guide rail pair, in particular to a rolling linear guide rail pair. Background Art
[0002] As a key functional component of CNC machine tools, rolling linear guides are mainly composed of guide rails and sliders, and play a role in bearing and guiding moving parts in mechanical transmission. Due to its advantages of low friction, smooth movement, and high movement accuracy, rolling linear guides have become one of the key basic components of precision CNC equipment.
[0003] Currently, common rolling linear guide pairs all use retaining chains to place the balls evenly spaced in a row, and then use a return assembly to guide and limit the running direction of the retaining chain during movement, forming a racetrack-like circulation path, realizing the continuous circulation motion of the ball assembly, making the ball assembly rotate more smoothly, thereby improving the smoothness of the guide pair's operation.
[0004] However, during actual operation, when the ball assembly enters the return assembly to rotate, the balls will move in a direction away from the center of rotation due to the action of centrifugal force. When the retaining chain rotates around the semi-cylinder, the balls will detach from the annular spacer block due to the action of the centrifugal force of the balls, causing the retaining chain to lose the radial position restriction of the balls. At the same time, due to the dragging force on both sides, the retaining chain will move in a direction close to the center of rotation. In addition, due to the manufacturing errors of the components, steps will appear in the mating position after assembly, resulting in jamming during the movement of the ball assembly. Utility Model Content
[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a rolling linear guide pair that runs more smoothly.
[0006] The utility model discloses a rolling linear guide pair, which comprises
[0007] A guide rail, wherein the upper end surface of the guide rail is provided with two first ball groove surfaces parallel to the axial direction of the guide rail, and the left and right end surfaces of the guide rail are respectively provided with second ball groove surfaces parallel to the axial direction of the guide rail;
[0008] A slider, wherein the slider is movably mounted on the guide rail, the inner end surface of the slider is provided with two first ball grooves matched with the first ball groove surface, the first ball groove surface and the first ball groove form a first ball pipeline, the left and right inner end surfaces of the slider are respectively provided with second ball grooves matched with the second ball groove surface, the first ball pipeline and the second ball groove form a second ball pipeline, a first ball channel is provided in the slider just above the first ball pipeline, and second ball channels are provided in the slider on the left and right sides of the second ball pipeline;
[0009] A return assembly, the return assembly comprising return end covers fixedly mounted on the left and right ends of the slider, the return end covers being embedded with semi-cylinders, the return end covers and the semi-cylinders cooperating to form upper and lower bead return grooves, the upper bead return groove connecting the first ball pipe and the first ball channel to form a first annular circulation channel, the lower bead return groove connecting the second ball pipe and the second ball channel to form a second annular circulation channel;
[0010] A ball assembly, wherein the ball assembly is divided into four groups and respectively located in the first annular circulation channel and the second annular circulation channel. The ball assembly comprises a retaining chain, on which annular spacers are evenly spaced, and balls are placed between the annular spacers. Both sides of the retaining chain are provided with limited convex edges, and both ends of the retaining chain are provided with avoidance arcs.
[0011] The return end cover cooperates with the semi-cylinder to form a turning groove that can accommodate the limiting convex edge, the width of the turning groove at the inlet and outlet positions is a, the width of the middle area is b, and b=1.5-2.0a, the width of the turning groove smoothly transitions from the inlet position to the middle area, and then smoothly transitions from the middle area to the outlet position;
[0012] A ball return pipe is plugged and installed on the return end cover, the ball return pipe is arranged in the first ball channel and the second ball channel, and a groove for fixing the limiting convex edge is arranged on the inner side of the ball return pipe;
[0013] The return end cover is plugged with an upper limit bar, a middle limit bar and a lower limit bar for limiting the position of the limit convex edge to prevent the ball assembly from turning over;
[0014] The positions where the upper limit bar, the middle limit bar and the lower limit bar are installed on the return end cover are all provided with a straight line guide area extending outward, the length of the straight line guide area is L, and the straight line guide area is provided with a position avoidance inclined surface; the semi-cylinder also extends outward at the position where it cooperates with the straight line guide area of the return end cover, and the length of the guide area is L;
[0015] The upper limit bar, the middle limit bar and the lower limit bar are provided with avoidance inclined surfaces at the positions where the front and rear ends thereof contact the linear guide area.
[0016] According to some embodiments of the present invention, the straight guide area is the same as the outward extension length of the guide area.
[0017] According to some embodiments of the present invention, the avoidance inclined surface is an unequal chamfer.
[0018] According to some embodiments of the utility model, the avoidance inclined surface has a long side along the movement direction and a short side perpendicular to the movement direction, and the length of the long side is 10 to 20 times the length of the short side.
[0019] According to some embodiments of the present invention, the avoidance arc is a 1 / 4 ellipse.
[0020] According to some embodiments of the utility model, the avoidance arc has a long side along the movement direction and a short side perpendicular to the movement direction, and the length of the long side is ≥L.
[0021] According to some embodiments of the utility model, the upper limit bar is located above the upper surface of the guide rail, and slots for positioning the limiting convex edge are provided on the left and right sides of the upper limit bar.
[0022] According to some embodiments of the utility model, there are two middle limit bars, which are respectively located at the left and right top corners of the upper surface of the guide rail. The middle limit bar is in a "┎" shape, and grooves for positioning the limit convex edges are provided on the left and right sides.
[0023] According to some embodiments of the utility model, there are two lower limit bars, which are respectively located at the left and right top corners of the lower surface of the guide rail. The lower limit bar is "L" shaped, and a positioning groove is formed on its upper part to position the limiting convex edge.
[0024] According to some embodiments of the present utility model, the upper limit bar, the middle limit bar and the lower limit bar are all installed on the return end cover by means of convex ribs.
[0025] The utility model has at least the following beneficial effects: in order to solve the problem of jamming of the ball assembly during movement, the patent mainly forms a steering groove that can accommodate the limiting convex edge by cooperating with the return end cover and the semi-cylinder, and the width of the steering groove changes gradually. This design effectively avoids the limiting convex edges on both sides of the retaining chain from scraping and contacting with the semi-cylinder; in addition, the positions where the upper limit bar, the middle limit bar and the lower limit bar are installed on the return end cover are all provided with straight line guide areas extending outward, and the semi-cylinder also extends outward at the position where the straight line guide area of the return end cover cooperates. This design provides adjustment and guiding space for the ball assembly when the rotary motion is converted into straight line motion, so as to ensure that the ball assembly can run smoothly; at the same time, the front and rear ends of the upper limit bar, the middle limit bar and the lower limit bar are provided with avoidance inclined surfaces at the contact positions with the straight line guide area, and avoidance arcs are provided at both ends of the retaining chain. Even if steps appear after the parts are assembled, this design can ensure that the ball assembly can pass through the return assembly smoothly.
[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:
[0028] Figure 1 It is a schematic diagram of the structure of the utility model;
[0029] Figure 2 This is a schematic diagram of the guide rail structure of the utility model;
[0030] Figure 3 This is a schematic diagram of the slider structure of the utility model;
[0031] Figure 4 It is a schematic diagram of the internal structure of the utility model;
[0032] Figure 5 This is a schematic diagram of the return end cover structure of the utility model;
[0033] Figure 6 This is a schematic diagram of a semi-cylindrical structure of the utility model;
[0034] Figure 7 This is a schematic diagram of the internal installation of the utility model;
[0035] Figure 8 This is a schematic diagram of the installation of the return end cover and the semi-cylinder of the utility model;
[0036] Fig. 9 for Figure 8 AA section view;
[0037] Fig.10 This is a schematic diagram of the holding chain structure of the utility model;
[0038] Fig.11 This is a schematic diagram of the bead return pipeline structure of the utility model;
[0039] Fig.12 This is a schematic diagram of the structure of the middle limit strip of the utility model;
[0040] Fig.13 This is a schematic diagram of the structure of the lower limit bar of the utility model;
[0041] Fig.14 It is a schematic diagram of the upper limit bar structure of the utility model. DETAILED DESCRIPTION
[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0043] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0044] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0045] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0046] Reference Figure 1 A rolling linear guide pair includes a guide rail 1, a slider 2, a return assembly 3, and a ball assembly 4.
[0047] Reference Figure 2The upper end surface of the guide rail 1 is provided with two first ball groove surfaces 11 parallel to the axial direction of the guide rail 1, and the left and right end surfaces of the guide rail 1 are respectively provided with second ball groove surfaces 12 parallel to the axial direction of the guide rail 1; the two rows of grooves of this design are designed on the upper part of the guide rail 1, and the contact angle is optimized to make it have higher radial rigidity performance.
[0048] Reference Figure 3 The slider 2 is movably mounted on the guide rail 1 to realize the slider 2 moving back on the guide rail 1. The inner end surface of the slider 2 is provided with two first ball grooves 21 that match the first ball groove surface 11, and the first ball groove surface 11 and the first ball groove 21 form a first ball pipe 22. The left and right inner end surfaces of the slider 2 are respectively provided with second ball grooves 23 that match the second ball groove surface 12, and the first ball pipe 22 and the second ball groove 23 form a second ball pipe 24. A first ball channel 25 is provided in the slider 2 just above the first ball pipe 22, and a second ball channel 26 is provided in the slider 2 on the left and right sides of the second ball pipe 24.
[0049] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 The return assembly 3 includes a return end cover 31 fixedly mounted on the left and right ends of the slider 2, and a semi-cylinder 32 is embedded on the return end cover 31. The return end cover 31 and the semi-cylinder 32 cooperate to form an upper and a lower return bead groove 33', 33. The upper return bead groove 33' connects the first ball pipe 22 and the first ball channel 25 to form a first annular circulation channel, and the lower return bead groove 33 connects the second ball pipe 24 and the second ball channel 26 to form a second annular circulation channel.
[0050] Reference Figure 7 , Fig.10, the ball assembly 4 is divided into 4 groups, which are respectively located in the first annular circulation channel and the second annular circulation channel, so as to realize the continuous circulation movement of the ball assembly 4. The ball assembly 4 includes a retaining chain 41, on which annular spacer blocks 411 are evenly spaced, and balls 42 are placed between the annular spacer blocks 411, so that the balls 42 are spaced apart respectively to avoid the collision of the balls 42 with each other during operation and produce certain noise; both sides of the retaining chain 41 are provided with limited convex edges 412, and both ends of the retaining chain 41 are provided with avoidance arcs 413. The avoidance arc 413 is a 1 / 4 ellipse. The avoidance arc 413 has a long side along the direction of movement and a short side perpendicular to the direction of movement, and the length of the long side is ≥L. Since the limiting convex edges 412 on both sides of the retaining chain 41 will have different degrees of deflection during the operation of the ball assembly 4, in order to ensure that the ball assembly 4 can smoothly pass through the return assembly 3, this avoidance arc 413 is specially designed.
[0051] Reference Figure 8 , Fig. 9 The return end cover 31 cooperates with the semi-cylinder 32 to form a turning groove 331 that can accommodate the limiting convex edge 412. The width of the exit and entrance positions 3311 and 3313 of the turning groove 331 is a, the width of the middle area 3312 is b, and b=1.5~2.0a. The width of the turning groove 331 smoothly transitions from the entrance position 3311 to the middle area 3312, and then smoothly transitions from the middle area 3312 to the exit position 3313. When the ball assembly 4 enters the return assembly 3 to rotate, the ball 42 will move in a direction away from the center of rotation due to the centrifugal force. When the retaining chain 41 rotates around the semi-cylinder 32, the ball 42 will separate from the annular spacer block 411 due to the centrifugal force, causing the retaining chain 41 to lose the position restriction of the ball 42 in the radial direction. At the same time, due to the dragging force on both sides, the retaining chain 41 will move in a direction close to the center of rotation. In order to avoid the scraping contact between the limiting convex edges 412 on both sides of the retaining chain 41 and the semi-cylinder 32, a steering groove 33 with a avoidance function is specially designed.
[0052] Reference Fig.11 A ball return pipe 5 is plugged and installed on the return end cover 31, and the ball return pipe is arranged in the first ball channel 25 and the second ball channel 26. A groove 51 for fixing the limiting convex edge 412 is arranged on the inner side of the ball return pipe 5.
[0053] Reference Figure 8 The return end cover 31 is plugged and installed with an upper limit bar 6, a middle limit bar 7 and a lower limit bar 8, which are used to limit the position of the limit convex edge 412 to prevent the ball assembly 4 from turning over.
[0054] Reference Fig. 9The positions where the upper limit strip 6, the middle limit strip 7 and the lower limit strip 8 are installed on the return end cover 31 are all provided with a straight line guide area 311 extending outwards, the length of the straight line guide area 311 is L, and the straight line guide area 311 is provided with a position avoidance inclined surface 312; the semi-cylinder 32 also extends outwards at the position where it cooperates with the straight line guide area 311 of the return end cover 31, and the length of the guide area 321 is L. The straight line guide area 311 and the guide area 321 extend outwards by the same length L.
[0055] Reference Fig.12 , Fig.13 , Fig.14 The upper limit bar 6 , the middle limit bar 7 and the lower limit bar 8 are provided with avoidance inclined surfaces 312 at the contact positions with the linear guide area 311 at the front and rear ends.
[0056] The avoidance slope 312 is an unequal chamfer, and the avoidance slope 312 has a long side along the direction of movement and a short side perpendicular to the direction of movement, and the length of the long side is 10 to 20 times the length of the short side. Since the return assembly 3 is assembled with the upper limit bar 6, the middle limit bar 7 and the lower limit bar 8, the manufacturing error of the parts easily leads to steps after assembly. At the same time, during the operation of the ball assembly 4, the limit convex edges 412 on both sides of the chain 41 will also have different degrees of deflection. In order to ensure that the ball assembly 4 can smoothly pass through the return assembly 3, this avoidance slope 312 is specially designed.
[0057] Reference Figure 8 , Fig.14 The upper limit bar 6 is located above the upper surface of the guide rail 1, and has slots 61 on its left and right sides for positioning the limiting convex edge 412.
[0058] Reference Figure 8 , Fig.12 There are two middle limit strips 7, which are respectively located at the left and right corners of the upper surface of the guide rail 1. The middle limit strip 7 is in a "┎" shape, and grooves 71 for positioning the limit convex edge 412 are provided on the left and right sides thereof.
[0059] Reference Figure 8 , Fig.13 There are two lower limit bars 8, which are respectively located at the left and right corners of the lower surface of the guide rail 1. The lower limit bar 8 is "L"-shaped, and a positioning groove 81 is formed on the upper part thereof to position the limit convex edge 412.
[0060] For the convenience of installation, the upper limit bar 6 , the middle limit bar 7 and the lower limit bar 8 are all installed on the return end cover 31 by plugging with convex ribs 91 .
[0061] In order to solve the problem of jamming of the ball assembly during movement, the present invention mainly forms a steering groove 331 that can accommodate the limiting convex edge 412 by cooperating with the return end cover 31 and the semi-cylinder 32. The width of the steering groove 331 changes gradually. This design effectively avoids the contact between the limiting convex edges 412 on both sides of the chain 41 and the semi-cylinder 32. In addition, the positions where the upper limiting strip 6, the middle limiting strip 7 and the lower limiting strip 8 are installed on the return end cover 31 are all provided with a straight line guide area 311 extending outward. The semi-cylinder 32 and the return end cover 31 are connected to each other. A guide area 321 also extends outward at the matching position of the linear guide area 311. This design provides adjustment and guiding space for the ball assembly 4 when the rotary motion is converted into linear motion, thereby ensuring that the ball assembly 4 can run smoothly. At the same time, the front and rear ends of the upper limit bar 6, the middle limit bar 7 and the lower limit bar 8 are provided with avoidance slopes 312 at the contact positions with the linear guide area 311, and avoidance arcs 413 are provided at both ends of the retaining chain 41. Even if steps appear after the parts are assembled, this design can ensure that the ball assembly 4 can smoothly pass through the return assembly 3.
[0062] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.
Claims
1. A rolling linear guide pair, characterized in that: include A guide rail (1), wherein the upper end surface of the guide rail (1) is provided with two first ball groove surfaces (11) parallel to the axial direction of the guide rail (1), and the left and right end surfaces of the guide rail (1) are respectively provided with second ball groove surfaces (12) parallel to the axial direction of the guide rail (1); A slider (2), the slider (2) being movably mounted on the guide rail (1), the inner end surface of the slider (2) being provided with two first ball grooves (21) cooperating with the first ball groove surface (11), the first ball groove surface (11) and the first ball groove (21) forming a first ball pipe (22), the left and right inner end surfaces of the slider (2) being provided with second ball grooves (23) cooperating with the second ball groove surface (12), the first ball pipe (22) and the second ball groove (23) forming a second ball pipe (24), a first ball channel (25) being provided in the slider (2) directly above the first ball pipe (22), and a second ball channel (26) being provided in the slider (2) on the left and right sides of the second ball pipe (24); A return assembly (3), the return assembly (3) comprising a return end cover (31) fixedly mounted on the left and right ends of the slider (2), a semi-cylinder (32) being embedded in the return end cover (31), the return end cover (31) and the semi-cylinder (32) cooperating to form an upper and a lower bead return groove (33', 33), the upper bead return groove (33') connecting the first ball pipe (22) and the first ball channel (25) to form a first annular circulation channel, the lower bead return groove (33) connecting the second ball pipe (24) and the second ball channel (26) to form a second annular circulation channel; A ball assembly (4), wherein the ball assembly (4) is divided into four groups and respectively located in a first annular circulation channel and a second annular circulation channel, the ball assembly (4) comprising a retaining chain (41), annular spacer blocks (411) being evenly spaced apart on the retaining chain (41), balls (42) being placed between the annular spacer blocks (411), limiting convex edges (412) being provided on both sides of the retaining chain (41), and avoiding circular arcs (413) being provided at both ends of the retaining chain (41); The return end cover (31) cooperates with the semi-cylinder (32) to form a turning groove (331) capable of accommodating the limiting convex edge (412); the width of the turning groove (331) at the inlet and outlet positions (3311, 3313) is a, the width of the middle area (3312) is b, and b=(1.5-2.0)a; the width of the turning groove (331) smoothly transitions from the inlet position (3311) to the middle area (3312), and then smoothly transitions from the middle area (3312) to the outlet position (3313); A ball return pipe (5) is plugged and installed on the return end cover (31), the ball return pipe is arranged in the first ball channel (25) and the second ball channel (26), and a groove (51) for fixing the limiting convex edge (412) is arranged on the inner side of the ball return pipe (5); An upper limit strip (6), a middle limit strip (7) and a lower limit strip (8) are plugged and installed on the return end cover (31) to limit the position of the limit convex edge (412) to prevent the ball assembly (4) from turning over; The positions where the upper limit strip (6), the middle limit strip (7) and the lower limit strip (8) are installed on the return end cover (31) are all provided with a straight line guide area (311) extending outwards, the length of the straight line guide area (311) is L, and the straight line guide area (311) is provided with a position avoidance inclined surface (312); the semi-cylinder (32) also has a guide area (321) extending outwards at the position matching the straight line guide area (311) of the return end cover (31), and the length of the guide area (321) is L; The front and rear ends of the upper limit strip (6), the middle limit strip (7) and the lower limit strip (8) are provided with avoidance inclined surfaces (312) at the contact positions with the linear guide area (311).
2. A rolling linear guide pair according to claim 1, characterized in that: The straight guide area (311) and the guide area (321) extend outwards to the same length.
3. A rolling linear guide pair according to claim 1, characterized in that: The avoidance inclined surface (312) is an unequal-sided chamfer.
4. A rolling linear guide pair according to claim 3, characterized in that: The avoidance inclined surface (312) has a long side along the moving direction and a short side perpendicular to the moving direction, and the length of the long side is 10 to 20 times the length of the short side.
5. The rolling linear guide pair according to claim 1, characterized in that: The avoidance arc (413) is a quarter ellipse.
6. A rolling linear guide pair according to claim 5, characterized in that: The avoidance arc (413) has a long side along the moving direction and a short side perpendicular to the moving direction, and the length of the long side is ≥L.
7. The rolling linear guide pair according to claim 1, characterized in that: The upper limit bar (6) is located above the upper surface of the guide rail (1), and has slots (61) on its left and right sides for positioning the limit convex edge (412).
8. The rolling linear guide pair according to claim 1, characterized in that: There are two middle limit strips (7), which are respectively located at the left and right top corners of the upper surface of the guide rail (1). The middle limit strip (7) is in a "┎" shape, and grooves (71) for positioning the limit convex edge (412) are provided on the left and right sides thereof.
9. The rolling linear guide pair according to claim 1, characterized in that: There are two lower limit bars (8), which are respectively located at the left and right top corners of the lower surface of the guide rail (1). The lower limit bar (8) is "L" shaped, and a positioning groove (81) is formed on its upper part for positioning the limit convex edge (412).
10. The rolling linear guide pair according to claim 1, characterized in that: The upper limit strip (6), the middle limit strip (7) and the lower limit strip (8) are all installed on the return end cover (31) by plugging with convex ribs (91).