Crossed roller retainer

Abstract

The utility model discloses a crossed roller retainer which comprises an inner ring, an outer ring and a plurality of isolation blocks arranged between the inner ring and the outer ring, rolling bodies are filled between the adjacent isolation blocks, and transverse limiting cambered surfaces matched with transverse rolling bodies are arranged on the left sides of the isolation blocks. A vertical limiting arc face matched with the vertical rolling body is arranged on the right side of the isolation block, and a plurality of weight reducing grooves are formed in the isolation block so that the weight of the whole crossed roller retainer can be reduced. And the transverse limiting cambered surface and the vertical limiting cambered surface are both provided with the oil guide grooves shaped like the Chinese character'wang ', so that the lubricating performance of the crossed roller retainer on the rolling body is improved. And the oil guide holes are connected between the weight reduction grooves and the oil guide grooves shaped like the Chinese character'wang 'and located at the ends of the oil guide grooves shaped like the Chinese character'wang', so that the flowability of lubricating oil in the crossed roller retainer is improved, the heating intensity of the bearing is reduced, and the service life of the whole bearing is further prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of crossed cylindrical roller bearings, and in particular relates to a crossed roller retaining frame. Background Art

[0002] Crossed roller bearings are a type of cylindrical roller bearings. Crossed roller bearings are a type of bearing that can withstand both large radial loads and large axial load overturning moments, and have relatively large support rigidity and relatively high rotation accuracy. The rolling elements are cylindrical rollers. The internal structure of the crossed roller bearings uses rollers that are arranged perpendicularly to each other at 90 degrees. Spacers or isolation blocks are installed between the rollers to prevent the rollers from tilting or rubbing against each other. Crossed roller bearings are mostly used inside high-precision instruments such as rotating chassis and robotic arms.

[0003] In traditional designs, cross cylindrical roller bearings are often not used due to the difficulty of mold opening for large turntable bearing cages and the cost of processing and manufacturing. Therefore, the existing technology often uses an isolation block structure to isolate the rolling elements. Although the isolation block structure is easy to process, it also has the following problems:

[0004] 1. Unlike the cage pocket structure, the isolation block structure can not ensure the reasonable axial and radial clearance and movement position of the rolling element in the cage structure, thereby ensuring the correct rotation position of the rolling element. The isolation block is usually a solid structure with high deformation and high weight, which makes it difficult to control the dimensional accuracy and easily causes the roller to skew and get stuck;

[0005] 2. During the operation of the bearing, the friction between the rolling element and the cage is likely to produce wear impurities, which is not conducive to maintaining the normal operation of the entire cylindrical bearing;

[0006] 3. After the bearing is filled with grease, the gap value between the isolation block and the rolling element cannot be calculated and guaranteed. This uncertainty not only causes uneven isolation gap and poor rotation consistency of the rolling element, but also causes installation difficulties. If the amount of grease filled is too much, the isolation block and the rolling element cannot be smoothly installed, resulting in a lack of rollers. This phenomenon can easily lead to the skewness of the isolation block during operation, causing serious quality defects such as the bearing being stuck. If the amount of grease is reduced to ensure smooth installation, it will also cause dry friction between the rolling element and the raceway, and the lubrication effect of the rolling element and the cage will be poor, causing problems such as heating of the bearing and reduced service life. Utility Model Content

[0007] In view of the above-mentioned shortcomings, the utility model provides a cross roller cage, which reduces the weight of the cross roller cage by opening a weight reduction groove in the isolation block of the cross roller cage, reduces the influence of the rolling body extruding the horizontal limiting arc surface or the vertical limiting arc surface on the overall deformation of the isolation block, facilitates the control of the dimensional accuracy of the isolation block, reduces the material consumption, and saves the manufacturing cost of the isolation block. The weight reduction groove opened in the isolation block can accommodate the wear impurities generated by the bearing during operation to maintain the normal operation of the bearing. The weight reduction groove can accommodate more lubricating grease, ensures the grease capacity of the cross roller cage, and the filled lubricating grease will basically not affect the installation of the isolation block. The W-shaped oil guide groove is opened on the horizontal limiting arc surface and the vertical limiting arc surface, which is convenient for the lubricating oil to cover the surface of the isolation block, improves the lubrication effect on the rolling body, and further improves the service life of the cross roller cage. Each weight reduction groove and the W-shaped oil guide groove are connected with an oil guide hole to improve the fluidity of the lubricating oil in the cross roller cage and reduce the heat generated during the operation of the bearing.

[0008] The utility model is realized by the following technical solutions:

[0009] A cross roller cage includes an inner ring, an outer ring, and a plurality of isolation blocks installed between the inner ring and the outer ring. Rolling bodies are filled between adjacent isolation blocks. A transverse limiting arc surface cooperating with the transverse rolling body is provided on the left side of the isolation block, and a vertical limiting arc surface cooperating with the vertical rolling body is provided on the right side of the isolation block. A plurality of weight-reducing grooves are provided in the isolation block to reduce the weight of the entire cross roller cage. The transverse limiting arc surface and the vertical limiting arc surface are both provided with a Chinese character "W" oil guide groove to improve the lubrication performance of the cross roller cage for the rolling body. An oil guide hole is connected between each weight-reducing groove and the Chinese character "W" oil guide groove. The oil guide hole is located at the end of the Chinese character "W" oil guide groove to improve the fluidity of the lubricating oil in the cross roller cage, reduce the heat intensity of the bearing, and thus improve the service life of the entire bearing.

[0010] Furthermore, the W-shaped oil guide groove includes a first oil guide groove opened on a transverse limiting arc surface and a second oil guide groove opened on a vertical limiting arc surface. The groove depths of the first oil guide groove and the second oil guide groove are equal, so that the lubrication effect of the left and right sides of the isolation block on the rolling body is basically the same, and the pressure on both ends of the isolation block is balanced when the rolling body is running.

[0011] Furthermore, the interior of the W-shaped oil guide groove is coated with an oleophilic coating, and the surfaces of the transverse limiting arc surface and the vertical limiting arc surface are both coated with an oleophilic coating, which improves the adhesion effect of the lubricating oil on the surface of the isolation block and helps to reduce the friction resistance between the isolation block and the rolling body.

[0012] Furthermore, the weight reducing grooves include two front weight reducing grooves and two rear weight reducing grooves. The openings of the front weight reducing grooves face the front of the isolation block, and the openings of the rear weight reducing grooves face the rear of the isolation block. The front weight reducing grooves and the rear weight reducing grooves are symmetrically distributed, and the two front weight reducing grooves are symmetrically distributed, thereby ensuring the supporting strength of the isolation block and balancing the compressive resistance around the isolation block.

[0013] Furthermore, the oil guide hole includes a first oil guide hole connecting the weight reduction groove and the first oil guide groove and a second oil guide hole connecting the weight reduction groove and the second oil guide groove. The first oil guide hole and the second oil guide hole are located on the same axis, reducing the flow resistance of the lubricating oil and improving the fluidity of the lubricating oil between the first oil guide groove and the second oil guide groove.

[0014] Furthermore, there is a vertical partition between the front weight reduction groove and the rear weight reduction groove, and there is a transverse partition between the two front weight reduction grooves and between the two rear weight reduction grooves. The vertical partition and the transverse partition are arranged to ensure the basic supporting strength of the isolation block and reduce the influence of the weight reduction groove on the supporting strength of the isolation block.

[0015] Furthermore, the weight-reducing groove has a transverse arc surface arranged concentrically with the transverse limiting arc surface and a vertical arc surface arranged concentrically with the vertical limiting arc surface, and the distance between the transverse limiting arc surface and the transverse arc surface is equal to the distance between the vertical limiting arc surface and the vertical arc surface. The wall thickness on the left and right sides of the isolation block is uniform and basically the same, which helps to better control the dimensional accuracy of the isolation block.

[0016] Furthermore, reinforcing plates are formed between both ends of the transverse limiting arc surface and both ends of the vertical limiting arc surface and the outer wall of the isolation block to ensure the structural strength of both sides of the transverse limiting arc surface and both sides of the vertical limiting arc surface.

[0017] Furthermore, the isolation block is produced by injection molding, which has a fast production speed and high efficiency, and the operation can be automated and mass-produced; the product size is accurate, the product is easy to update, and parts with complex shapes can be made.

[0018] Furthermore, the top wall area of ​​the isolation block is larger than the bottom wall area of ​​the isolation block. The top wall of the isolation block is close to the outer ring. According to the centrifugal force requirement when the bearing rotates, a larger top wall is provided to improve the supporting strength for the rolling element.

[0019] Beneficial effects of the utility model:

[0020] 1. By opening a weight-reducing groove in the isolation block of the cross roller cage, the weight of the cross roller cage is reduced, and the influence of the rolling element extruding the lateral limiting arc surface or the vertical limiting arc surface on the overall deformation of the isolation block is reduced, which is convenient for controlling the dimensional accuracy of the isolation block, reducing the material consumption, and saving the isolation block manufacturing cost;

[0021] 2. The weight-reducing grooves in the isolation block can accommodate the wear impurities generated by the bearing during operation to maintain the normal operation of the bearing;

[0022] 3. The weight-reducing groove can hold more lubricating grease, ensuring the grease capacity of the cross roller cage, and the filled lubricating grease will basically not affect the installation of the isolation block;

[0023] 4. A W-shaped oil guide groove is provided on the horizontal limiting arc surface and the vertical limiting arc surface to facilitate the lubricating oil to cover the surface of the isolation block, thereby improving the lubrication effect on the rolling element and thus increasing the service life of the cross roller cage;

[0024] 5. Each weight-reducing groove and the W-shaped oil guide groove are connected with an oil guide hole to improve the fluidity of the lubricating oil in the cross roller cage and reduce the heat generated during the operation of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram for illustrating a schematic implementation of an isolation block of a cross roller cage in the utility model;

[0026] Figure 2 A structural schematic diagram for illustrating another exemplary implementation of an isolation block of a cross roller cage in the utility model;

[0027] Figure 3 A top view for illustrating a schematic implementation of a spacer block of a cross roller cage in the utility model;

[0028] Figure 4 A front view for illustrating a schematic implementation of a spacer block of a cross roller cage in the utility model;

[0029] Figure 5 A cross-sectional view for illustrating a schematic implementation of a spacer block of a cross roller cage in the utility model;

[0030] Figure 6 A cross-sectional view for illustrating another exemplary embodiment of an isolation block of a cross roller cage in the utility model.

[0031] List of parts and reference numerals:

[0032] 1. Horizontally limited arc surface; 2. Vertically limited arc surface; 3. Weight reduction groove; 31. Front weight reduction groove; 32. Rear weight reduction groove; 33. Vertical partition; 34. Horizontal partition; 35. Horizontal arc surface; 36. Vertical arc surface; 4. W-shaped oil guide groove; 41. First oil guide groove; 42. Second oil guide groove; 5. Oil guide hole; 51. First oil guide hole; 52. Second oil guide hole; 6. Oleophilic coating; 7. Strengthening plate; 8. Top wall; 9. Bottom wall. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that the directional terms such as left, right, up, down, front and back in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, that is, the direction of movement of the product, and should not be considered as limiting.

[0035] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention are not only changes in position, but also include movements such as rotation and rolling where there is no relative change in position but a change in state.

[0036] Finally, it should be noted that when a component is referred to as being "located" or "set on" another component, it can be on the other component or there can be an intermediate component at the same time. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be an intermediate component at the same time.

[0037] like Figures 1 to 6 A cross roller cage shown in the figure includes an inner ring, an outer ring and a plurality of isolation blocks installed between the inner ring and the outer ring. Rolling bodies are filled between adjacent isolation blocks. A transverse limiting arc surface 1 cooperating with the transverse rolling body is provided on the left side of the isolation block, and a vertical limiting arc surface 2 cooperating with the vertical rolling body is provided on the right side of the isolation block. A plurality of weight-reducing grooves 3 are provided in the isolation block to reduce the weight of the entire cross roller cage. A W-shaped oil guide groove 4 is provided on both the transverse limiting arc surface 1 and the vertical limiting arc surface 2 to improve the lubrication performance of the cross roller cage for the rolling body. An oil guide hole 5 is connected between each weight-reducing groove 3 and the W-shaped oil guide groove 4. The oil guide hole 5 is located at the end of the W-shaped oil guide groove 4 to improve the fluidity of the lubricating oil in the cross roller cage, reduce the heat intensity of the bearing, and thus improve the service life of the entire bearing.

[0038] In one embodiment, first, an isolation block is filled between the inner ring and the outer ring, and then the rolling body is vertically installed between the inner ring and the outer ring, and the side wall of the rolling body abuts against the vertical limiting arc surface 2 of the first isolation block, and then an isolation block is filled between the inner ring and the outer ring again, and the vertical limiting arc surface 2 of the second isolation block abuts against the side wall of the first rolling body, and then the second rolling body is filled, and the rolling body is horizontally installed between the inner ring and the outer ring, and the side wall of the rolling body abuts against the horizontal limiting arc surface 1 of the second isolation block, and then the third isolation block is filled, and the installation state of the third isolation block is consistent with that of the first isolation block, and the horizontal limiting arc surface 1 of the third isolation block abuts against the side wall of the second rolling body, and the fourth isolation block is consistent with the installation state of the second isolation block, and the isolation blocks and rolling bodies are installed alternately in sequence until the last rolling body is installed to achieve the installation of the cross roller bearing.

[0039] In one embodiment, the weight-reducing groove 3 can contain lubricating grease to ensure that the cross roller bearing retainer has sufficient lubricating grease, and because the lubricating grease is filled inside the weight-reducing groove 3, the filled lubricating grease will basically not have an adverse effect on the installation of the rolling elements and the isolation blocks.

[0040] In one embodiment, during the operation of the cross roller bearing, the rolling element and the isolation block rub against each other to generate wear debris, especially when the cross roller bearing is just used, a large amount of debris is generated between the rolling element and the isolation block, and these debris can easily hinder the rotation of the rolling element, thereby affecting the service life of the entire cross roller bearing. Therefore, the weight reduction groove 3 is designed so that the weight reduction groove 3 can accommodate a certain amount of wear debris, thereby reducing the adverse effect of the wear debris on the operation of the cross roller bearing.

[0041] In one embodiment, a W-shaped oil guide groove 4 is opened on both the transverse limiting arc surface 1 and the vertical limiting arc surface 2. The lubricating oil flowing out of the W-shaped oil guide groove 4 can basically cover the transverse limiting arc surface 1 and the vertical limiting arc surface 2, with a wide coverage area, thereby improving the lubrication effect of the transverse limiting arc surface 1 and the vertical limiting arc surface 2 on the rolling body.

[0042] An oil guide hole 5 is connected between the weight reduction groove 3 and the U-shaped oil guide groove 4. The oil guide hole 5 is located at the end of the U-shaped oil guide groove 4 to improve the fluidity of the lubricating oil in the cross roller cage, reduce the heating intensity of the bearing, and thus increase the service life of the entire bearing.

[0043] Preferably, the W-shaped oil guide groove 4 includes a first oil guide groove 41 opened on the transverse limiting arc surface 1 and a second oil guide groove 42 opened on the vertical limiting arc surface 2. The groove depths of the first oil guide groove 41 and the second oil guide groove 42 are equal, so that the lubrication effect of the left and right sides of the isolation block on the rolling body is basically the same, and the pressure on both ends of the isolation block is balanced when the rolling body is running.

[0044] Preferably, the interior of the W-shaped oil guide groove 4 is coated with an oleophilic coating 6, and the surfaces of the transverse limiting arc surface 1 and the vertical limiting arc surface 2 are both coated with an oleophilic coating 6, which improves the adhesion effect of the lubricating oil on the surface of the isolation block and helps to reduce the friction resistance between the isolation block and the rolling body.

[0045] In one embodiment, the Chinese-shaped oil guide groove 4, the transverse limiting arc surface 1 and the vertical limiting arc surface 2 are coated with an oleophilic coating 6 to improve the adhesion effect of the lubricating oil, thereby effectively ensuring that there is a complete lubrication layer between the rolling element and the isolation block.

[0046] Preferably, the weight reducing grooves 3 include two front weight reducing grooves 31 and two rear weight reducing grooves 32. The openings of the front weight reducing grooves 31 face the front of the isolation block, and the openings of the rear weight reducing grooves 32 face the rear of the isolation block. The front weight reducing grooves 31 and the rear weight reducing grooves 32 are symmetrically distributed. The two front weight reducing grooves 31 are symmetrically distributed, thereby ensuring the supporting strength of the isolation block and balancing the compressive resistance around the isolation block.

[0047] Preferably, the oil guide hole 5 includes a first oil guide hole 51 connecting the weight reducing groove 3 and the first oil guide groove 41 and a second oil guide hole 52 connecting the weight reducing groove 3 and the second oil guide groove 42. The first oil guide hole 51 and the second oil guide hole 52 are located on the same axis, thereby reducing the flow resistance of the lubricating oil and improving the fluidity of the lubricating oil between the first oil guide groove 41 and the second oil guide groove 42.

[0048] In one embodiment, the first oil guide hole 51 and the second oil guide hole 52 are arranged on the same axis, which increases the flow rate of the lubricating oil in the first oil guide groove 41 to the second oil guide groove 42, and the two oil guide holes 5 are coaxially arranged to reduce the flow resistance of the lubricating oil.

[0049] Preferably, there is a vertical partition 33 between the front weight-reducing groove 31 and the rear weight-reducing groove 32, and there is a transverse partition 34 between the two front weight-reducing grooves 31 and between the two rear weight-reducing grooves 32. The vertical partition 33 and the transverse partition 34 are provided to ensure the basic supporting strength of the isolation block and reduce the influence of the weight-reducing groove 3 on the supporting strength of the isolation block.

[0050] Preferably, the weight-reducing groove 3 has a transverse arc surface 35 concentrically arranged with the transverse limiting arc surface 1 and a vertical arc surface 36 concentrically arranged with the vertical limiting arc surface 2, and the distance between the transverse limiting arc surface 1 and the transverse arc surface 35 is equal to the distance between the vertical limiting arc surface 2 and the vertical arc surface 36. The wall thickness on the left and right sides of the isolation block is uniform and basically the same, which helps to better control the dimensional accuracy of the isolation block.

[0051] Preferably, reinforcing plates 7 are formed between both ends of the transverse limiting arc surface 1 and both ends of the vertical limiting arc surface 2 and the outer wall of the isolation block to ensure the structural strength of both sides of the transverse limiting arc surface 1 and both sides of the vertical limiting arc surface 2.

[0052] In one embodiment, in order to ensure that when the rolling body squeezes the transverse limiting arc surface 1 or the vertical limiting arc surface 2, both the transverse limiting arc surface 1 and the vertical limiting arc surface 2 have good compression resistance, reinforcing plates 7 are provided on both sides of the transverse limiting arc surface 1 and the vertical limiting arc surface 2 to improve the supporting strength of the transverse limiting arc surface 1 and the vertical limiting arc surface 2 to the rolling body.

[0053] Preferably, the isolation block is injection molded, which has a fast production speed and high efficiency, and the operation can be automated and mass-produced; the product size is precise, the product is easy to update, and parts with complex shapes can be made.

[0054] Preferably, the area of ​​the top wall 8 of the isolation block is larger than the area of ​​the bottom wall 9 of the isolation block. The top wall 8 of the isolation block is close to the outer ring. According to the centrifugal force requirements when the bearing rotates, a larger top wall 8 is set to improve the supporting strength of the rolling body.

[0055] When the above-mentioned cross roller cage is adopted, by opening a weight reduction groove 3 in the isolation block of the cross roller cage, the weight of the cross roller cage is reduced, and the influence of the rolling body squeezing the horizontal limiting arc surface 1 or the vertical limiting arc surface 2 on the overall deformation of the isolation block is reduced, which is convenient for controlling the dimensional accuracy of the isolation block, and reducing the material consumption, saving the isolation block manufacturing cost. The weight reduction groove 3 opened in the isolation block can accommodate the wear impurities generated by the bearing during operation to maintain the normal operation of the bearing. The weight reduction groove 3 can accommodate more lubricating grease, ensuring the grease capacity of the cross roller cage, and the filled lubricating grease will basically not affect the installation of the isolation block. The Wang-shaped oil guide groove 4 is opened on the horizontal limiting arc surface 1 and the vertical limiting arc surface 2, so that the lubricating oil can cover the surface of the isolation block, improve the lubrication effect on the rolling body, and then improve the service life of the cross roller cage. Each weight reduction groove 3 and the Wang-shaped oil guide groove 4 are connected with an oil guide hole 5 to improve the fluidity of the lubricating oil in the cross roller cage and reduce the heat generated when the bearing is running.

[0056] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A cross roller cage, comprising an inner ring, an outer ring and a plurality of spacer blocks installed between the inner ring and the outer ring, wherein rolling elements are filled between adjacent spacer blocks, characterized in that: The left side of the isolation block is provided with a transverse limiting arc surface that cooperates with the transverse rolling body, and the right side of the isolation block is provided with a vertical limiting arc surface that cooperates with the vertical rolling body. A plurality of weight-reducing grooves are provided in the isolation block, and both the transverse limiting arc surface and the vertical limiting arc surface are provided with a Chinese-shaped oil guide groove. An oil guide hole is connected between each of the weight-reducing grooves and the Chinese-shaped oil guide groove, and the oil guide hole is located at the end of the Chinese-shaped oil guide groove.

2. A cross roller cage according to claim 1, characterized in that: The Chinese character "W"-shaped oil guide groove comprises a first oil guide groove provided on the transverse limiting arc surface and a second oil guide groove provided on the vertical limiting arc surface, and the groove depths of the first oil guide groove and the second oil guide groove are equal.

3. A cross roller cage according to claim 1, characterized in that: The interior of the Wang-shaped oil guide groove is coated with an oleophilic coating, and the surfaces of the transverse limiting camber surface and the vertical limiting camber surface are both coated with an oleophilic coating.

4. A cross roller cage according to claim 2, characterized in that: The weight-reducing grooves include two front weight-reducing grooves and two rear weight-reducing grooves, the openings of the front weight-reducing grooves face the front of the isolation block, and the openings of the rear weight-reducing grooves face the rear of the isolation block. The front weight-reducing grooves and the rear weight-reducing grooves are symmetrically distributed, and the two front weight-reducing grooves are symmetrically distributed.

5. A cross roller cage according to claim 4, characterized in that: The oil guide hole comprises a first oil guide hole communicating with the weight-reducing groove and the first oil guide hole and a second oil guide hole communicating with the weight-reducing groove and the second oil guide hole, and the first oil guide hole and the second oil guide hole are located on the same axis.

6. A cross roller cage according to claim 4, characterized in that: A vertical partition is provided between the front weight-reducing groove and the rear weight-reducing groove, and a transverse partition is provided between the two front weight-reducing grooves and between the two rear weight-reducing grooves.

7. A cross roller cage according to claim 1, characterized in that: The weight-reducing groove has a transverse arc surface arranged concentrically with the transverse limiting arc surface and a vertical arc surface arranged concentrically with the vertical limiting arc surface, and the distance between the transverse limiting arc surface and the transverse arc surface is equal to the distance between the vertical limiting arc surface and the vertical arc surface.

8. The cross roller cage according to claim 1, characterized in that: Reinforcement panels are formed between both ends of the transverse limiting arc surface and both ends of the vertical limiting arc surface and the outer wall of the isolation block.

9. The cross roller cage according to claim 1, characterized in that: The isolation block is injection molded.

10. The cross roller cage according to claim 1, characterized in that: The area of ​​the top wall of the isolation block is greater than the area of ​​the bottom wall of the isolation block, and the top wall of the isolation block is close to the outer ring.

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