Roller linear guide rail pair

Abstract

The invention discloses a roller linear guide rail pair. The roller linear guide rail pair comprises a guide rail, a sliding block and a roller, a ball return pipeline allowing the roller to roll circularly is arranged in a rotation hole in the sliding block, the ball return pipeline is formed by splicing strip-shaped plates which are symmetrical left and right, a long-strip-shaped oil groove is formed in the middle of each strip-shaped plate in the length direction of the strip-shaped plate, long-strip-shaped hollowed-out holes are symmetrically formed in the two sides of each long-strip-shaped oil groove, and the long-strip-shaped hollowed-out holes are communicated with the ball return pipeline. Chamfers are arranged at the positions, matched with the reversers, of the two ends of each strip-shaped plate. According to the invention, the split hollow ball return pipeline design is mainly adopted, so that the deformability of the ball return pipeline is effectively improved, the resistance generated by the clamping stagnation of the pin roller is released, and the motion smoothness and stability are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of linear guide pair components, specifically, it relates to a roller linear guide pair. Background Technology

[0002] Currently, domestic roller guide pairs still lag behind advanced international levels in core design, precision manufacturing processes, material heat treatment, and raceway forming accuracy. Common problems include guide pair operation difficulties and unreasonable structural design. Existing technologies are insufficient to meet the stringent requirements of ultra-precision, high rigidity, long lifespan, and low maintenance costs for roller guide pairs, ranging from high-end CNC machine tools and aerospace equipment to semiconductor precision equipment. Therefore, structural optimization and performance improvement of roller guide pairs have become key technical issues that urgently need to be addressed in the field of precision transmission.

[0003] However, while pursuing high rigidity, existing roller guide pairs often suffer from shortcomings in terms of smooth operation, wear resistance, and impact resistance. Therefore, optimizing the structure and improving the performance of roller guide pairs has become a key technical problem that urgently needs to be solved in the field of precision transmission. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a roller linear guide pair with better operating smoothness.

[0005] The present invention is achieved through the following technical solution: a roller linear guide pair, which comprises a guide rail, a slider and rollers; The slider has a ball return pipe inside the rotary hole for the roller to circulate. The ball return pipe is made of left and right symmetrical strip plates spliced ​​together. Each strip plate has a long strip oil groove at the middle of its length direction. The long strip oil groove has long strip hollow holes symmetrically opened on both sides. Each strip plate has chamfers at both ends where it mates with the return device.

[0006] According to some embodiments of the present invention, the mating surfaces of the interlocking strip plates are respectively provided with matching bosses and grooves.

[0007] According to some embodiments of the present invention, a retainer for supporting the roller is provided at the groove position of the slider.

[0008] According to some embodiments of the present invention, the retainer is provided with a retaining steel strip in an M-shaped arc structure.

[0009] According to some embodiments of the present invention, the retaining steel strip is provided with three inwardly recessed pressure points, corresponding to the two ends and the middle position of the retainer, respectively.

[0010] According to some embodiments of the present invention, the groove on the slider has a straight cross-section, and the groove and the retaining edge are connected by a relief groove.

[0011] According to some embodiments of the present invention, the retaining edge is an outwardly convex arc.

[0012] According to some embodiments of the present invention, the distance from the vertex of the convex arc to the theoretical straight flange C is L, and L increases as the diameter of the roller increases.

[0013] According to some embodiments of the present invention, L is between 0.02 mm and 0.08 mm.

[0014] According to some embodiments of the present invention, the center of the convex arc is located on the center line of the roller, and the radius of the convex arc increases as the diameter of the roller increases.

[0015] According to embodiments of the present invention, at least the following beneficial effects are achieved: The present invention mainly adopts a "split-type hollowed-out" return ball pipe design, which is designed as a return ball pipe composed of two strip plates with long, hollowed-out holes spliced ​​together. During high-speed operation of the guide rail pair, the rollers are prone to accumulate in the rotational channel where the return ball pipe and the return end cap cooperate, leading to jamming. The long, hollowed-out holes on the return ball pipe effectively improve its deformation capacity, thereby releasing the resistance caused by roller jamming and improving the smoothness and stability of the movement. Furthermore, the long, narrow oil groove in the middle of the strip plate forms a continuous grease storage area along the length of the pipe, ensuring sufficient lubrication of the rollers during rolling, avoiding localized dry friction and groove burns, and achieving simple and effective long-term lubrication.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the appearance of the present invention; Figure 2 This is a schematic diagram of the internal installation of the slider of the present invention; Figure 3 An internal sectional view of the invention; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 This is a schematic diagram of the strip plate structure of the present invention; Figure 6 This is a schematic diagram of the strip plate structure from another direction according to the present invention; Figure 7 This is a schematic diagram of the internal installation of the rotary hole of the present invention; Figure 8 This is a schematic diagram of the retaining steel strip structure of the present invention. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a corresponding orientation, or be constructed and operated in a corresponding orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1-3 The present invention provides a roller linear guide pair, which mainly consists of a guide rail 1, a slider 2, rollers 3 as rolling elements, a return device 5, and a retaining component. The slider 2 moves linearly on the guide rail 1, and the rollers 3 circulate in a closed loop formed by the guide rail, the groove 22 of the slider 2, the ball return channel 4, and the return devices 5 at both ends.

[0023] Reference Figures 5-6 The return pipe 4 is a key component of this invention for improving operational smoothness. It is not a traditional one-piece pipe, but rather composed of two completely symmetrical strip plates 41 joined together. Each strip plate 41 is precision injection molded from high-strength engineering plastics or composite materials. Each strip plate 41 has a long, narrow oil groove 411 located at its midpoint along its length. This oil groove 411 can store a large amount of lubricating grease. This design ensures that the roller 3 is always uniformly coated with an oil film throughout the entire return stroke, completely avoiding localized dry friction and the resulting groove burns.

[0024] Reference Figure 7 When the guide rail pair is running at high speed, the rollers 30 are prone to accumulate in the rotary channel where they cooperate with the return pipe 40 and other return accessories, resulting in jamming. Therefore, elongated hollow holes 412 are symmetrically opened on both sides of the elongated oil groove 411. Their function is to improve the deformation capacity of the return pipe 40, thereby releasing the resistance caused by the jamming of the rollers 30. The two ends of the strip plate 41 are chamfered 413 to ensure a smooth transition without steps when assembled with the return device 5. This prevents the rollers 30 from jamming due to differences in assembly or molding precision of plastic parts, and improves the smoothness of the guide rail pair's operation.

[0025] To ensure precise alignment when the two strip plates 41 are joined, matching bosses 414 and grooves 415 are designed on their mating sides. During assembly, simply press the bosses 414 into the corresponding grooves 415 to complete the pipe splicing, forming a smooth-walled, precisely sized circular or elliptical roller channel.

[0026] Reference Figures 2-3 The groove 22 of the slider 2 is provided with a retainer 6 to support the roller 3. A retaining steel strip 7 with a specific shape is sleeved on the outside of the retainer 6.

[0027] Reference Figure 8 The retaining steel strip 7 is pre-bent into an "M" shape with three specially machined inwardly recessed pressure points 71. When the retaining steel strip 7 is fitted onto the cage 6, these three pressure points 71 press tightly against the ends and middle of the cage 6, respectively. This design allows the retaining steel strip 7 to generate a continuous and uniform inward clamping force on the cage 6, thereby indirectly pressing the roller 3 more firmly within the slider groove 22, preventing it from shifting or jumping during high-speed movement, and significantly improving the smoothness and reliability of the motion.

[0028] Reference Figure 4The bearing raceway, i.e., groove 22, on the slider 2 is machined into a straight section to ensure line contact with the roller 3, possessing high rigidity and high load-bearing capacity. The groove 22 is connected to the side flange 24 via a relief groove 23. A key improvement of this invention lies in the shape of the flange 24: it is not a vertical plane but is machined into a convex arc. The center of this arc is located on the center line of the roller 3, and the radius of the convex arc increases with the diameter of the roller 3. The vertical distance from the vertex of the convex arc to the theoretical straight flange C is L. The value of L is an important design parameter, which increases appropriately with the diameter of the roller 3 used to ensure optimal friction and load-bearing balance for products of different specifications. After extensive simulation and experimental verification, the preferred range for L is 0.02 mm to 0.08 mm. This design changes the contact between the end face of the roller 3 and the flange 24 from a surface to a point or a very short arc, significantly reducing the contact area. It also provides good lubrication performance, easily forms an oil film, and is less prone to wear and heat generation, thereby effectively reducing sliding friction resistance, frictional heat, and wear.

[0029] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A roller linear guide pair, characterized in that: It consists of a guide rail (1), a slider (2), and rollers (3); The slider (2) has a ball return pipe (4) inside the rotating hole (21) for the roller (3) to circulate. The ball return pipe (4) is made of left and right symmetrical strip plates (41). Each strip plate (41) has a long strip oil groove (411) at the middle position along its length direction. The long strip oil groove (411) has long strip hollow holes (412) symmetrically opened on both sides. Each strip plate (41) has a chamfer (413) at both ends where it cooperates with the return device (5).

2. The roller linear guide pair according to claim 1, characterized in that: The interlocking strips (41) are provided with matching bosses (414) and grooves (415) on their mating surfaces.

3. A roller linear guide pair according to claim 1, characterized in that: The groove (22) of the slider (2) is provided with a retainer (6) to support the roller (3).

4. A roller linear guide pair according to claim 3, characterized in that: The retainer (6) is provided with a retaining steel strip (7) in an M-shaped arc structure.

5. A roller linear guide pair according to claim 4, characterized in that: The retaining steel strip (7) has three inwardly recessed pressure points (71), which correspond to the two ends and the middle position of the retainer (6), respectively.

6. A roller linear guide pair according to claim 1, characterized in that: The groove (22) on the slider (2) has a straight cross section, and the groove (22) and the retaining edge (24) are connected by a relief groove (23).

7. A roller linear guide pair according to claim 6, characterized in that: The retaining edge (24) is an outwardly convex arc.

8. A roller linear guide pair according to claim 7, characterized in that: The distance from the vertex of the convex arc to the theoretical straight edge C is L, and L increases as the diameter of the roller (3) increases.

9. A roller linear guide pair according to claim 8, characterized in that: The value of L is between 0.02 mm and 0.08 mm.

10. A roller linear guide pair according to claim 9, characterized in that: The center of the convex arc is located on the center line of the roller (3), and the radius of the convex arc increases as the diameter of the roller (3) increases.

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