Composite cylindrical roller bearing retainer
By adding a limiting portion to the inner wall of the cylindrical roller pocket to cooperate with the limiting groove on the roller surface, the rotation range of the roller is limited and collision avoided, the dynamic instability and material fatigue of the composite bearing cage is solved, and the stability and load bearing capacity are improved.
Patent Information
- Application Number
- CN202422555296.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-22
AI Technical Summary
When existing composite bearing cages bear axial and radial loads, the rotation speed of the rolling element is difficult to synchronize with the rotation speed of the cage, resulting in frequent collisions, increasing dynamic instability and material fatigue damage, and it is difficult to take into account both load-bearing capacity and lightweighting in the window beam design.
The upper limit and lower limit are added to the inner wall of the cylindrical roller pocket, and cooperate with the limit groove on the roller surface to limit its rotation range to avoid collision with the window beam. At the same time, a ball pocket is opened in the center of the window beam to ensure independent movement of the ball and optimize stress distribution and load bearing capacity.
It improves the operating stability and load-bearing capacity of bearings, reduces friction and wear, extends service life and reduces maintenance costs.
Smart Images
Figure CN223164897U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of bearing cages, and particularly relates to a composite cylindrical roller bearing cage. Background Art
[0002] In specific application scenarios, bearings need to bear both axial and radial loads simultaneously. Although traditional combined bearings can meet this requirement, they are bulky. To solve this problem, a new type of bearing cage design has emerged. This cage can accommodate cylindrical rollers and balls simultaneously. The two are arranged at intervals and share the same window beam structure, realizing the composite load-bearing function within a single bearing, and the volume is reduced compared with the combined bearing. However, during actual operation, it is difficult to accurately synchronize the revolution speed of the rolling elements and the rotation speed of the cage, resulting in frequent dynamic collisions between the two. The impact force generated by this collision is particularly severe under high-speed operation or high-load conditions, mainly concentrated on the corner area of the window beam of the cage. Long-term action will cause serious stress concentration, accelerate the fatigue cumulative damage of the material, and further increase the fatigue, deformation and even fracture risk of the cage in this area.
[0003] It is particularly worth noting that this new type of cage combines two types of rolling elements, cylindrical rollers and balls. Compared with a cage with a single type of rolling element, its motion state is more complex and changeable. The cylindrical rollers and balls are restricted by each other due to sharing the window beam. Any impact on the window beam by one of them will affect the motion state of the other, increasing the dynamic instability of the system. If a separated window beam design is considered to avoid this problem, the effective assembly area of the cage will be greatly reduced, affecting the load-bearing capacity. On the other hand, if the thickness of the window beam is increased to improve the strength, it will inevitably lead to an increase in the overall weight of the cage, which is not conducive to lightweight design. Therefore, the existing technology needs to be further improved. Summary of the Utility Model
[0004] The utility model provides a composite cylindrical roller bearing cage, which while ensuring enhanced load-bearing capacity, optimizes the dynamic matching between the cylindrical rollers and ball rollers and the cage, and reduces collision damage.
[0005] To achieve the above object, the utility model provides the following technical solutions:
[0006] A composite cylindrical roller bearing cage, which is composed of two annular structures and multiple window beams that connect the two annular structures and are evenly spaced. Cylindrical roller pockets are formed between adjacent window beams to accommodate cylindrical rollers. Ball pockets are opened at the central positions of each window beam to install balls. Upper limit parts and lower limit parts are correspondingly arranged on the upper side and the lower side of the inner wall of the cylindrical roller pocket. The upper / lower limit parts are respectively matched with the upper / lower limit grooves arranged at the centers of the upper / lower surfaces of the cylindrical rollers, restricting the rotation of the cylindrical rollers in the designed area and preventing them from contacting and impacting the window beams, ensuring the independence of the operation of the cylindrical rollers and the balls, reducing the mutual influence between the two, and improving the operation stability of the bearing.
[0007] For the composite cylindrical roller bearing cage of the present application, by ingeniously adding upper limit parts and lower limit parts at the top and bottom of the inner wall of the cylindrical roller pocket and achieving precise matching with the limit grooves on the upper and lower surfaces of the cylindrical rollers, the rotational movement of the cylindrical rollers within their predetermined range is restricted, effectively avoiding unnecessary collisions between them and the window beams, ensuring that the cylindrical rollers and the balls can move independently of each other without interference. Therefore, the cylindrical rollers can rotate stably without being affected by any collision or deformation of the window beams, thus significantly improving the overall operation stability of the bearing. Using the idea of directly opening ball pockets at the centers of the window beams, the balls are completely enclosed in a solid space formed by the window beam structure, rather than being merely enclosed by two independent window beams. Such a layout not only optimizes the stress distribution, avoiding excessive concentration of stress at the vulnerable corners where the window beams are connected to the annular structures, but also significantly enhances the load-bearing capacity of the entire cage.
[0008] In a preferred implementation, the diameter of the balls is larger than the diameter of the cylindrical rollers. When the balls contact the concave raceways provided on the inner and outer rings of the bearing, the cylindrical rollers contact the non-concave areas of the inner and outer rings.
[0009] The diameter of the balls is larger than the diameter of the cylindrical rollers to ensure that the balls can effectively bear the axial load and restrict the relative movement of the inner and outer rings of the bearing.
[0010] In a preferred implementation, the width w1 of the window beam and the width w2 of the cylindrical roller pocket satisfy w2 < w1 ≤ 2w2.
[0011] To ensure that ball pockets with a diameter larger than that of the cylindrical rollers can be opened, the width w1 of the window beam must be greater than the width w2 of the cylindrical roller pocket. At the same time, to maintain the structural strength of the window beam, w1 cannot be too large to avoid unnecessary material waste and affecting the effective area for installing rollers in the overall cage. The range of w2 < w1 ≤ 2w2 is set, which not only ensures that the window beam has enough width to open the ball pockets but also ensures that the window beam has enough structural strength when being impacted by the balls.
[0012] In a preferred implementation, the window beam is provided with oil passing holes, and the oil passing holes are evenly spaced around the ball pocket hole.
[0013] In a preferred implementation, an oil passing groove is provided inside the ball pocket hole, and the oil passing groove is arranged in a dislocation manner with respect to the oil passing holes.
[0014] Due to the dislocation arrangement and circumferential coverage of the oil passing groove and the oil passing holes, the lubricating grease can reach the roller surface more quickly and form a thin lubricating oil film between the roller and the raceways of the inner and outer rings of the bearing. Good lubrication can significantly extend the service life of the bearing and reduce the maintenance cost.
[0015] In a preferred implementation, the diameter of the upper / lower limiting groove is larger than the diameter of the upper / lower limiting portion.
[0016] The gap between the limiting groove and the limiting portion can not only provide a rotational allowance but also accommodate a certain amount of lubricating oil. This lubricating oil can play a lubricating role when the limiting portion rotates, further reducing friction and wear.
[0017] In a preferred implementation, the groove depth of the upper / lower limiting groove is larger than the length of the upper / lower limiting portion.
[0018] In a preferred implementation, the upper / lower limiting portion is integrally formed with or detachably connected to the annular structure body.
[0019] In a preferred implementation, the annular structure body is integrally formed with or detachably connected to the window beam. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings described herein are used to provide a further understanding of the present invention, form a part of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation to the present invention. In the drawings:
[0021] Figure 1 Illustrates a schematic three-dimensional structure diagram of a preferred implementation of the cage of the composite cylindrical roller bearing of the present application;
[0022] Figure 2 Illustrates a schematic structural diagram of a preferred implementation of the cage of the composite cylindrical roller bearing of the present application for installing cylindrical rollers and balls;
[0023] Figure 3 Illustrates a schematic structural diagram of a preferred implementation of the window beam of the present application with oil passing holes and oil passing grooves opened;
[0024] Reference Signs Explanation:
[0025] 1 - Ring - shaped structure; 2 - Window beam; 20 - Oil - passing hole; 3 - Cage pocket for cylindrical roller; 4 - Cylindrical roller; 5 - Cage pocket for ball; 50 - Oil - passing groove; 6 - Ball; 7 - Upper limit part; 8 - Lower limit part; 9 - Lower limit groove. Detailed implementation mode
[0026] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.
[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it cannot be understood as a limitation to the present invention. In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium.
[0028] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. However, indicating a direct connection means that there is no connection relationship constructed through an excessive structure between the two connected main bodies, and they are only connected through the connection structure to form a whole. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present invention can be understood according to specific circumstances.
[0029] In the present invention, the descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.
[0030] The present invention will be described below with reference to the accompanying drawings of the specification.
[0031] The specific solution adopted is:
[0032] AsFigures 1-3 As shown in the figure, the utility model provides a composite cylindrical roller bearing cage, which is composed of two annular structures 1 and a plurality of window beams 2 that connect the two annular structures and are evenly spaced. Cylindrical roller pockets 3 are formed between adjacent window beams to accommodate cylindrical rollers 4. Ball pockets 5 are opened at the central positions of each window beam to install balls 6. Upper limit parts 7 and lower limit parts 8 are correspondingly arranged on the upper side and the lower side of the inner wall of the cylindrical roller pocket. The upper limit part and the lower limit part are respectively matched with an upper limit groove 9 and a lower limit groove arranged at the centers of the upper and lower surfaces of the cylindrical roller, restricting the rotation of the cylindrical roller in the designed area and preventing it from contacting and impacting the window beam, ensuring the independence of the operation of the cylindrical roller and the ball, reducing the mutual influence between the two, and improving the operation stability of the bearing.
[0033] In the above structure, by adding the upper limit part 7 and the lower limit part 8 to the top and bottom of the inner wall of the cylindrical roller pocket and closely matching them with the limit grooves on the upper and lower surfaces of the cylindrical roller, this design effectively restricts the rotation of the cylindrical roller in the predetermined area, thus preventing unnecessary collision with the window beam 2. In this way, the cylindrical roller and the ball 6 can achieve an independent movement mechanism and will not affect the rotation of the rolling elements due to the collision and deformation of the window beam, reducing the mutual interference between them and significantly improving the operation stability of the bearing. Only the ball will contact the window beam, and the design of directly opening the ball pocket at the center of the window beam makes the structure around the ball all window beam structures, not enclosed by two independent window beams. Such a layout not only avoids the concentration of stress at the vulnerable parts of the window beam (such as the connection corner between the window beam and the annular structure), but also significantly enhances the overall load-bearing capacity.
[0034] As a preferred embodiment of the present application, the diameter of the ball 6 is larger than that of the cylindrical roller 4. The ball contacts the concave raceways of the inner and outer rings of the bearing, while the cylindrical roller contacts the non-concave areas of the inner and outer rings. Because the cylindrical roller has a larger contact area with the bearing, it can bear high radial loads. When the bearing bears an axial force, due to its spherical characteristics and the close fit with the raceways of the inner and outer rings, the ball can restrict the relative movement of the inner and outer rings of the bearing and prevent them from disengaging. At this time, the ball mainly bears a lighter axial load to ensure the stable operation of the bearing.
[0035] As a preferred embodiment of the present application, the width w1 of the window beam 2 and the width w2 of the cylindrical roller pocket satisfy w2 < w1 ≤ 2w2, and the diameter of the ball is larger than that of the cylindrical roller to ensure that the ball can effectively bear the axial load and restrict the relative movement of the inner and outer rings of the bearing. Therefore, the diameter of the ball pocket must be large enough to accommodate the ball, and the width w1 of the window beam directly determines the size of the ball pocket.
[0036] To ensure that ball pockets with a diameter larger than that of cylindrical rollers can be formed, the width w1 of the window beam must be greater than the width w2 of the cylindrical roller pockets. At the same time, to maintain the structural strength of the window beam, w1 cannot be too large to avoid unnecessary material waste and affect the effective area for installing rollers in the cage as a whole. If w1 is too small, the window beam may be damaged by impact; if w1 is too large, it will waste materials and affect the overall performance of the cage. Setting the range of w2 < w1 ≤ 2w2 ensures that the window beam has sufficient width to form ball pockets and also ensures that the window beam has sufficient structural strength when impacted by balls.
[0037] As a preferred embodiment of the present application, the window beam is provided with oil through holes 20, and the oil through holes are evenly spaced around the ball pockets. This layout ensures that the lubricating grease can be evenly distributed around each ball during the passage of the oil through holes, thereby achieving effective lubrication of all balls and contributing to the lubrication of the balls. Further, an oil through groove is provided inside the ball pocket, and the oil through groove 50 is arranged in a staggered manner with the oil through holes. The positions and numbers of the oil through groove and the oil through holes can ensure that they can circumferentially cover the rollers as a whole. Due to the staggered arrangement and circumferential coverage of the oil through groove and the oil through holes, the lubricating grease can reach the roller surface more quickly and form a thin lubricating oil film between the rollers and the raceways of the inner and outer rings of the bearing. Good lubrication can significantly extend the service life of the bearing, reduce maintenance costs. At the same time, due to the reduction of friction and wear, the reliability and stability of the bearing will also be improved.
[0038] As a preferred implementation manner of the present application, the diameter of the upper / lower limit groove is larger than the diameter of the upper / lower limit portion. Designing the diameter of the limit groove to be larger than the diameter of the limit portion allows the limit portion to have a certain rotational margin within the limit groove. This margin can reduce friction and jamming phenomena caused by manufacturing tolerances, material deformation, or temperature changes, etc., ensuring smooth operation of the components during operation; the gap between the limit groove and the limit portion can not only provide a rotational margin but also accommodate a certain amount of lubricating oil. These lubricating oils can play a lubricating role when the limit portion rotates, further reducing friction and wear.
[0039] Further, the depth of the upper / lower limit groove is greater than the length of the upper / lower limit portion. The deeper limit groove can accommodate more lubricating oil, thereby providing a better lubrication effect when the limit portion rotates, contributing to reducing friction and wear, and extending the service life of the components.
[0040] As a preferred embodiment of the present application, the upper / lower limit portions are integrally formed with or detachably connected to the annular structure 1.
[0041] The upper / lower limit parts and the annular structure body of the integrally formed structure are formed by the same material and the same technological process, and there is no connection interface between them. Therefore, they have higher structural strength and better overall performance. This structure performs excellently in bearing loads, resisting deformation, and maintaining precision. Referring to the illustration, it is designed that the upper part of the limit part is long and the lower part is short. During assembly, the bottom surface of the cylindrical roller is located on the upper side of the lower limit part. As the cylindrical roller descends, the lower limit part gradually enters the lower limit groove. At this time, the upper limit part still remains firmly in the upper limit groove, ensuring the stability and reliability of the entire structure.
[0042] The detachable connection design enables the upper / lower limit parts to be replaced individually when damaged or worn, without the need to replace the entire annular structure body. This greatly reduces the maintenance cost and time cost, and improves the availability and reliability of the equipment.
[0043] To further improve the structural strength of the upper / lower limit parts, local thickening treatment can be performed on them. This design can significantly improve the load-bearing capacity and anti-deformation ability of key parts without increasing the overall weight. The shapes of the upper / lower limit parts can be designed as square, cylindrical, etc., and the specific shape depends on the actual application scenario and requirements.
[0044] As a preferred embodiment of the present application, the annular structure body 1 and the window beam 2 are integrally formed or detachably connected. The integrally formed annular structure body and the window beam have higher structural strength and better overall performance, while the detachably connected annular structure body and the window beam can be replaced individually when damaged or worn, without the need to replace the entire structure.
[0045] In the present utility model, the parts not described can be realized by adopting or referring to the existing technologies.
[0046] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various changes or substitutions, and these should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims
1. A composite cylindrical roller bearing cage, comprising two annular structures and a plurality of window beams connecting the two annular structures and evenly spaced, characterized in that, Circular roller pocket holes are formed between adjacent window beams to accommodate circular rollers. Ball pocket holes are provided at the central positions of each window beam to install balls. Upper and lower limit parts are correspondingly arranged on the upper and lower sides of the inner wall of the circular roller pocket hole. The upper / lower limit parts are respectively matched with the upper / lower limit grooves provided at the centers of the upper and lower surfaces of the circular roller, restricting the rotation of the circular roller within the designed area and preventing it from contacting and impacting the window beam, ensuring the independence of the circular roller and the ball during the operation process, reducing the mutual influence between the two, and improving the operation stability of the bearing.
2. The cage of the combined cylindrical roller bearing according to claim 1, characterized in that, The diameter of the ball is larger than that of the circular roller. When the ball contacts the concave raceways provided on the inner and outer rings of the bearing, the circular roller contacts the non-concave areas of the inner and outer rings.
3. The composite cylindrical roller bearing cage according to claim 1, characterized in that, The width w1 of the window beam and the width w2 of the circular roller pocket hole satisfy w2 < w1 ≤ 2w2.
4. The cage of the composite cylindrical roller bearing according to claim 1, characterized in that The window beam is provided with oil passing holes, and the oil passing holes are arranged at uniform intervals around the ball pocket hole.
5. The cage of the composite cylindrical roller bearing according to claim 4, characterized in that, An oil passing groove is provided inside the ball pocket hole, and the oil passing groove is arranged in a staggered manner with the oil passing hole.
6. The cage of the composite cylindrical roller bearing according to claim 1, characterized in that The diameter of the upper / lower limit groove is larger than the diameter of the upper / lower limit part.
7. The cage of the composite cylindrical roller bearing according to claim 6, characterized in that, The groove depth of the upper / lower limit groove is larger than the length of the upper / lower limit part.
8. The cage of the composite cylindrical roller bearing according to claim 1, characterized in that, The upper / lower limit part is integrally formed with or detachably connected to the annular structure.
9. The cage of the combined cylindrical roller bearing according to claim 1, characterized in that, The annular structure is integrally formed with or detachably connected to the window beam.