Novel linear bearing retainer

Abstract

The novel linear bearing retainer comprises an outer ring and steel balls installed on the inner side of the outer ring, a plurality of arc-shaped retainers are installed on the inner side of the outer ring, the steel balls are located on the inner sides of the arc-shaped retainers, grooves and protruding ribs are arranged on the two sides of each arc-shaped retainer respectively, and the multiple arc-shaped retainers are combined into the complete retainer after being mutually embedded. The front and rear ends of the holder are fixed through holder fixing rings.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bearings, and relates to a medium-large linear bearing. BACKGROUND

[0002] Linear bearings are one of the commonly used mechanical parts in the field of bearings, and are widely used due to their simple structure and high interchangeability. Most linear bearings on the market are small and medium-sized, and the development of large linear bearings is rare.

[0003] Small bearings: bearings with a nominal outer diameter size range of 28-55mm;

[0004] Small and medium-sized bearings: bearings with a nominal outer diameter size range of 60-115mm;

[0005] Medium-large bearings: bearings with a nominal outer diameter size range of 120-190mm;

[0006] Large bearings: bearings with a nominal outer diameter size range of 200-430mm;

[0007] Extra-large bearings: bearings with a nominal outer diameter size range of more than 440mm.

[0008] Small and medium-sized linear bearings are relatively simple to manufacture and have low difficulty. There are almost no large linear bearings (with an outer diameter of more than 200mm) on the market, and they mainly rely on imports. According to investigations, the cost of large linear bearings is high, the processing difficulty is great, and most manufacturers cannot meet the required precision requirements. One of the pain points is that the cage inside the linear bearing is difficult to meet the technical requirements of the market. Even if it can meet the requirements, the manufacturing difficulty is several times higher than that of small and medium-sized linear bearings, and the cost is also frighteningly high. High equipment and mold costs need to be invested, and the value of the output cage is directly daunting, not to mention the huge technical difficulty.

[0009] Utility model patent CN213298600U describes a low-noise seamless linear bearing cage. From the last figure, it can be seen that there are 6 rows of raceways, which is a process scheme for small and medium-sized linear bearing cages. The core solution is to optimize the design and reduce noise. This method uses the mainstream cage on the market, which is generally injection molded.

[0010] Patent CN103470634A writes a linear bearing retainer, which adopts a process method of metal powder forming into a plate and then stamping and cutting. According to the textual description, it is aimed at a six-row ball linear bearing, and it is also a process scheme for small and medium-sized linear bearing retainers. The core solution is to replace the material of the retainer from the commonly used engineering plastic to the metal plate, and then to complete the welding, polishing and shaping by using the die.

[0011] Both of them adopt the one-piece method, and the design, structure, process, quality, cost and other difficulties existing in the one-piece method for large-size retainers have not been solved. For example, using injection molding process, the size of medium and large retainers is large, the tonnage of the injection molding machine required is large, the injection molding die is large and complex, the length to wall thickness ratio of the product is very large, the plastic has been cooled and completed before reaching the middle position during injection molding, and it is easy to appear empty material and incomplete injection molding phenomenon. If the mold is heated, the product is deformed after demolding, and other problems exist.

[0012] In summary, the research on large-size linear bearing retainers is essential. SUMMARY

[0013] In order to solve the problems of large-size linear bearing retainers, such as large machining difficulty, large injection molding difficulty, easy deformation after forming, precision and performance not meeting the relevant technical requirements, or machining forming, the required pipe material is difficult to purchase, using bar material exists great waste, and machining cost is high. The present application improves the design idea of the retainer, the structure combination, changes the existing processing technology, and makes breakthrough progress in the medium and large linear bearing retainers.

[0014] In combination with the above content, the present application scheme is as follows:

[0015] A new type of linear bearing retainer comprises an outer ring and steel balls mounted on the inner side of the outer ring, a plurality of arc retainers are mounted on the inner side of the outer ring, the steel balls are located in the inner side of the arc retainers, the arc retainers and the outer ring form a circulating channel, the steel balls circulate and roll in the inner side of the circulating channel, the arc retainers have grooves and protruding ribs on both sides, respectively, a plurality of arc retainers are embedded and combined into a complete retainer through the grooves and the protruding ribs, and the retainer is fixed through a retainer fixing ring at both ends.

[0016] In order to further improve, the retainer fixing ring is provided with a mounting groove, and the arc retainers are provided with protruding steps at both ends, which are matched with the mounting groove.

[0017] Further improvement, the arc retainers are made of nylon.

[0018] Further improvement, the arc-shaped retainer has 8-10.

[0019] Further improvement, the arc-shaped retainer has 6.

[0020] Further improvement, the retainer is provided with a sealing ring mounted on the inner side of the outer ring at the front and rear ends.

[0021] Further improvement, the sealing ring is provided with a snap spring at the end away from the retainer, and the inner side of the outer ring is provided with a clamping groove at the front and rear ends, and the snap spring is clamped in the inner side of the clamping groove.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. Reducing equipment investment and technical difficulty, the one-time injection amount of the integrated linear bearing retainer is more than 8 times of the design, so a large-tonnage injection molding machine is needed to complete the injection molding, and the injection molding process and the deformation control of the injection molding finished product are also great technical difficulties. Various processes, equipment, cost and quality problems of plastic forming with super large length and wall thickness ratio are successfully avoided.

[0024] 2. The mold volume is greatly reduced, and the volume of the injection molding finished product is reduced by more than 12 times, and the design, production, technology and investment requirements of the mold are greatly reduced.

[0025] 3. Improve the installation method of large linear bearing: the installation of integrated retainer is difficult, and the experience of personnel is also required to a certain extent, the present application is a split retainer, which is simple and convenient to install, and the proper roundness of the retainer is guaranteed through the metal fixing ring, which is self-adapted to the roundness of the bearing outer ring, and the deformation of the integrated injection molding retainer due to large structure and thin wall thickness is avoided, which is irreversible after deformation and cannot be self-adapted to the bearing ring.

[0026] 4. Run more smoothly: the retainer fixing ring is combined with the retainer protruding step. The radial movement of the retainer can be reduced, and the rotation of the steel ball is more stable, so that the large and medium-sized linear bearing runs more smoothly and has higher precision.

[0027] 5. Reduce material and processing waste: when using machining process production, there is no need to purchase large-size pipe materials that are difficult to adapt, and plate materials with close sizes can be directly used for production, thereby avoiding the waste of materials and processing time, and greatly reducing the requirements of cost, equipment, process and technology. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the explosion diagram of the present application;

[0029] Figure 2 is a structural schematic view of the present application;

[0030] Figure 3 This is a schematic diagram of the arc-shaped cage of the present invention;

[0031] Figure 4 This is a schematic diagram of the arc-shaped cage of the present invention;

[0032] Figure 5 This is a schematic diagram of the retainer fixing ring of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1. Outer ring; 11. Slot; 2. Arc-shaped retainer; 21. Groove; 22. Raised rib; 23. Raised step; 3. Retainer fixing ring; 31. Mounting groove; 4. Steel ball; 5. Sealing ring; 6. Snap ring. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings:

[0035] like Figures 1-2 As shown: A novel linear bearing cage includes improving the structure of existing cages based on small and medium-sized linear bearing cages, and optimizing the cage design, mold structure, and processing technology by combining existing data to reduce manufacturing costs. On this basis, the precision and performance of medium and large linear bearing cages are improved. This invention can meet the precision and performance requirements of medium and large linear bearing cages.

[0036] The structure generally consists of an eight- to ten-lobed arc-shaped retainer 2, made of nylon or other molded materials, which can be reduced to six lobes, plus two metal retainer fixing rings 3 accessories.

[0037] like Figures 2-5 As shown: The arc-shaped cage 2 has grooves 21 and raised ribs 22 on both sides. The multi-lobed arc-shaped cage 2 can be assembled into a complete cage by interlocking the grooves 21 and raised ribs 22. The interlocking structure of the grooves 21 and raised ribs 22 makes the cage more stable during the operation of the linear bearing. After the cage is assembled, two cage retaining rings 3 are used. The cage retaining rings 3 are combined with the cage raised steps 23 to fix the cage to ensure the required roundness and axial positioning. After the cage is assembled, it can be installed into the outer ring 1 of the linear bearing. Then, the steel balls 4 are installed into each groove in sequence to complete the installation of the linear bearing. The sealing ring 5 and the hole retaining ring 6 are engaged to ensure that the cage retaining rings 3 will not fall out of the bearing ring.

[0038] In use, the recess 21 is buckled with the convex rib 22, the axial length is aligned, the structure of the recess 21 and the convex rib 22 is embedded to make the retainer more stable during the operation of the linear bearing, two retainer fixing rings 3 are needed after the assembly of the retainer, the retainer fixing ring 3 is combined with the retainer convex step 23, so that the retainer is fixed to ensure the roundness and the axial positioning, the assembled retainer can be installed into the linear bearing outer ring 1, then the steel ball 4 is sequentially installed into each channel, and the installation of the linear bearing is completed. The sealing ring 5 cooperates with the hole with the clip spring 6 to ensure that the retainer fixing ring 3 cannot fall out of the bearing sleeve.

[0039] Although the present application has been illustrated and described with reference to the preferred embodiments, it should be understood by those of ordinary skill in the art that various changes in form and details can be made therein without departing from the scope of the claims.

Claims

1. A novel linear bearing cage, comprising an outer ring (1) and steel balls (4) mounted inside the outer ring (1), characterized in that: Several arc-shaped retainers (2) are installed on the inner side of the outer ring (1). The steel ball (4) is located on the inner side of the arc-shaped retainer (2). The arc-shaped retainer (2) has a groove (21) and a raised rib (22) on both sides. Several arc-shaped retainers (2) are interlocked to form a complete retainer. The front and rear ends of the retainer are fixed by retainer fixing rings (3).

2. The novel linear bearing cage according to claim 1, characterized in that: The retainer fixing ring (3) is provided with a mounting groove (31), and the arc-shaped retainer (2) is provided with raised steps (23) at both the front and rear ends, and the raised steps (23) are adapted to the mounting groove (31).

3. A novel linear bearing cage according to claim 1, characterized in that: The arc-shaped cage (2) is made of nylon.

4. A novel linear bearing cage according to claim 1, characterized in that: There are 8-10 arc-shaped cages (2).

5. A novel linear bearing cage according to claim 1, characterized in that: There are 6 arc-shaped cages (2).

6. A novel linear bearing cage according to claim 1, characterized in that: The retainer is provided with sealing rings (5) installed on the inner side of the outer ring (1) at both the front and rear ends.

7. A novel linear bearing cage according to claim 6, characterized in that: A retaining ring (6) is installed at the end of the sealing ring (5) away from the retainer. The outer ring (1) has grooves (11) at both the front and rear ends on the inner side. The retaining ring (6) is engaged with the inner side of the grooves (11).

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