Needle roller retainer
By employing a bent window beam structure and an oil passage gap design in the needle roller cage, the problems of needle drop, friction, and strength of the needle roller cage are solved, thereby improving the lubrication effect and structural durability.
Patent Information
- Application Number
- CN202422704142.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-06
AI Technical Summary
Existing needle roller cages are prone to problems such as needle loss, increased friction, decreased structural strength, and insufficient lubrication during use, which leads to a shortened bearing life.
The structure adopts a bent window beam, with interval steps, avoidance parts and oil passage gaps, combined with C-shaped bends and arc transition surfaces to enhance support capacity and improve lubrication.
It improves the overall strength and lubrication effect of the cage, reduces friction and friction loss, avoids needle drop, extends service life and improves structural durability.
Smart Images
Figure CN223498452U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of bearing cage technology, and specifically relates to a needle roller cage. Background Technology
[0002] Currently, the rollers of needle roller bearings are both thin and long, and the radial structure between multiple needle rollers is compact during installation. Therefore, the needle roller cage used to fix the needle rollers in needle roller bearings also has a relatively compact radial structure, and it still needs to have a high load-bearing capacity during the use of the bearing.
[0003] Although the needle roller cage has a smaller friction cross-section compared to traditional spherical rollers due to the slender structure of the needle rollers, most existing needle roller cages have a straight surface parallel to the radial direction of the cage on the side of the support beam forming the window. This results in a relatively large contact area between the support beam and the needle rollers. Moreover, since the needle rollers themselves bear the radial force applied by the inner and outer rings of the bearing, this arrangement can easily lead to needle drop during assembly. Furthermore, during use, due to the large radial load, deformation of the cage support beam or even damage to the entire cage can occur.
[0004] Furthermore, the contact friction between the needle rollers and the cage in existing technologies is relatively high, which shortens the overall bearing life. In actual use, the contact area between the upper and lower ends of the cage and the upper and lower end faces of the needle rollers is large, and insufficient lubrication exists. This leads to increased friction between the needle rollers and the cage, causing them to overheat easily. The rollers are also prone to axial movement, resulting in unstable contact between the rollers and the upper and lower ends of the cage. This can easily cause irregular axial impacts on the cage, leading to a rapid decrease in the structural strength of the cage and affecting the normal use of the cage and even the bearing. Additionally, the existing bent window beams have straight inclined surfaces at the bends, which easily cause stress concentration problems. Under continuous contact with the needle rollers and subjected to their squeezing and impact, the window beams have a very high risk of fracture.
[0005] This shows that existing technologies still have certain shortcomings. Utility Model Content
[0006] This application provides a needle roller retainer to solve at least one of the above-mentioned technical problems.
[0007] The technical solution adopted in this application is as follows:
[0008] A needle roller retainer includes an annular body and window openings evenly arranged around the annular body, with a bent window beam disposed between adjacent window openings; the annular body includes a first ring beam and a second ring beam, and along the axial direction of the annular body, the two ends of the window openings form a spaced step between the first ring beam and the second ring beam; the bent window beam includes a support portion and a first part and a second part symmetrically disposed at both ends of the support portion, the two ends of the support portion are provided with C-shaped bends, the support portion is connected to the first part and the second part through the C-shaped bends, and along the radial direction of the annular body, the support portion protrudes into the annular body relative to the first part and the second part; the first part and the second part have a clearance portion on the side facing the window opening, and the clearance portion has a first oil passage gap with the needle roller.
[0009] In a preferred embodiment of this application, the first ring beam and the second ring beam are provided with extensions on the side facing the interior of the annular body along the radial direction of the annular body, and at least a portion of the extensions have a second oil passage gap with the end face of the needle roller.
[0010] In a preferred embodiment of this application, along the axial direction of the annular body, the extension is provided with an oil-filled groove on the side facing the interior of the annular body.
[0011] In a preferred embodiment of this application, a first oil passage groove is provided on the side of the spacer step facing the window opening.
[0012] In a preferred embodiment of this application, the support portion further includes a straight segment, and the C-shaped bend segment is symmetrically arranged at both ends of the straight segment. The straight segment is connected to the first portion and the second portion through the C-shaped bend segment.
[0013] In a preferred embodiment of this application, a second oil passage groove is provided on the side of the straight segment facing the window opening.
[0014] In a preferred embodiment of this application, the straight segment is provided with a slope surface that contacts and engages with the needle roller.
[0015] In a preferred embodiment of this application, the support portion is provided with a wear-resistant coating on the side facing the window opening, and the step-spaced portion is provided with a wear-resistant coating on the side facing the window opening.
[0016] In a preferred embodiment of this application, the C-shaped bending section is provided with a first arc-shaped transition surface on the side facing the window hole, and a third oil passage gap is provided between the first arc-shaped transition surface and the needle roller.
[0017] In a preferred embodiment of this application, the bending angle of the C-shaped bend is in the range of 35° to 60°.
[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:
[0019] 1. In the above-mentioned scheme, the use of a bent window beam structure enhances the support capacity of the cage support beam, thereby improving the overall strength of the cage. Simultaneously, in this application, by setting interval steps and clearance sections, multiple oil passage gaps are formed between the needle rollers and the cage, significantly reducing the friction area between the needle rollers and the cage. This also improves the flowability of lubricating grease between the cage, needle rollers, and the inner and outer rings of the bearing, enhancing the lubrication effect and further reducing friction and collision losses between the needle rollers and the cage, which is beneficial for extending the service life of the cage. Furthermore, by setting structures such as the first oil passage groove, the second oil passage groove, and the oil passage ring groove, the flowability of the lubricating grease is further improved, thereby further enhancing the lubrication effect, while also achieving the effect of reducing material usage and weight.
[0020] 2. In the above scheme, the side surface of the straight segment facing the window hole has an angle with the radial direction of the annular body, which further enhances the ability of the straight segment to limit the needle roller in the radial direction and avoids problems such as "needle drop".
[0021] 3. Compared with existing bearing cages that use bent window beams, the C-shaped bend in this application has a bending angle in the range of 35° to 60° and adopts an arc-shaped transition structure. By using an arc-shaped transition surface, stress can be effectively dispersed, avoiding stress concentration at the bending position that would reduce the structural strength of the bent window beam, thereby improving the durability and safety of the structure. Attached Figure Description
[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0023] Figure 1 Here is a schematic diagram of a needle roller cage in one example;
[0024] Figure 2 Here is a partial structural cross-sectional view of a needle roller cage in an example;
[0025] Figure 3 This is a schematic diagram of the mating structure of the needle roller and the needle roller cage in one example;
[0026] Figure 4 for Figure 3 Enlarged view of the structure of section A;
[0027] Figure 5This is a schematic diagram of a partial fit between a needle roller and a bent window beam in an example.
[0028] List of components and reference numerals:
[0029] 1. Annular body, 11. First ring beam, 12. Second ring beam, 13. Window hole, 14. Spaced step, 15. Extension, 151. Second oil passage gap;
[0030] 2. Bent window beam, 21. Supporting part, 211. Straight section, 212. C-shaped bend section, 2121. First arc transition surface, 2122. Third oil passage gap, 2123. Second arc transition surface, 22. First part, 23. Second part, 24. Avoidance part, 241. First oil passage gap.
[0031] 3. Needle rollers. Detailed Implementation
[0032] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.
[0033] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.
[0034] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0036] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.
[0037] Reference Figures 1-5 As shown, this application provides a needle roller 3 retainer, which includes an annular body 1 and window openings 13 evenly arranged around the annular body 1, with a bent window beam 2 provided between adjacent window openings 13. In one example, refer to... Figure 1 and Figure 2 As shown, the annular body 1 includes a first ring beam 11 and a second ring beam 12. A stepped gap 14 is formed between the two ends of the window opening 13 along the axial direction of the annular body 1 and the first ring beam 11 and the second ring beam 12. Preferably, the bent window beam 2 includes a support portion 21 and a first portion 22 and a second portion 23 symmetrically arranged at both ends of the support portion 21. C-shaped bends 212 are provided at both ends of the support portion 21. The support portion 21 is connected to the first portion 22 and the second portion 23 through the C-shaped bends 212. Along the radial direction of the annular body 1, the support portion 21 protrudes into the interior of the annular body 1 relative to the first portion 22 and the second portion 23. Continuing to refer to... Figures 3-5 As shown, the first part 22 and the second part 23 have a clearance part 24 on the side facing the window hole 13, and there is a first oil passage gap 241 between the clearance part 24 and the needle roller 3.
[0038] In the above scheme, the use of the bent window beam 2 structure improves the support capacity of the cage support beam to enhance the overall strength of the cage. At the same time, in this application scheme, by setting the interval step 14 and the avoidance part 24, multiple oil passage gaps are formed between the needle roller 3 and the cage, which greatly reduces the friction area between the needle roller 3 and the cage and also improves the flow of lubricating grease between the cage, the needle roller 3 and the inner and outer rings of the bearing, thereby improving the lubrication effect and further reducing the friction and collision loss between the needle roller 3 and the cage, which is conducive to extending the service life of the cage.
[0039] Furthermore, referring to Figure 1 and Figure 2As shown, along the radial direction of the annular body 1, the first ring beam 11 and the second ring beam 12 are provided with extensions 15 on the side facing the interior of the annular body 1. At least a portion of the extensions 15 has a second oil passage gap 151 between it and the end face of the needle roller 3. As a preferred embodiment of this application, along the axial direction of the annular body 1, the side of the extensions 15 facing the interior of the annular body 1 is also provided with an oil passage groove, and the side of the step 14 facing the window hole 13 is provided with a first oil passage groove. With this arrangement, the lubricating grease can flow smoothly between the upper and lower end faces of the needle roller 3 and the window hole 13 and the extensions 15, thereby reducing the friction between the cage and the needle roller 3, reducing the irregular movement of the needle roller 3 in the axial direction, and thus reducing the axial impact of the needle roller 3 on the cage. This is beneficial to ensuring the stability of the rolling path of the needle roller 3 and thus ensuring the normal use of the needle roller 3 bearing. In one example, the first oil passage groove is located in the middle of the spacer step 14 and extends radially through the spacer step 14 along the annular body 1. In another example, the first oil passage groove is located at both ends of the spacer step 14 and extends radially through the spacer step 14 along the annular body 1, that is, the first oil passage groove is located at the four corners of the window opening 13. It should be noted that the arrangement of the first oil passage groove in this application is not limited to the above examples. The above examples are only a preferred embodiment of this application, and other different arrangements can also be adopted. This application does not specifically limit these arrangements.
[0040] Furthermore, referring to Figure 1 , Figure 2 As shown, the support portion 21 also includes a straight segment 211, and C-shaped bends 212 are symmetrically arranged at both ends of the straight segment 211. The straight segment 211 is connected to the first portion 22 and the second portion 23 through the C-shaped bends 212. In a preferred example, the surface of the straight segment 211 facing the window 13 has an angle with the radial direction of the annular body 1. This further enhances the ability of the straight segment 211 to limit the needle roller 3 in the radial direction, avoiding problems such as "needle drop". Furthermore, the straight segment 211 has a second oil groove on the side facing the window 13, and a beveled surface that contacts and engages with the needle roller 3. With this arrangement, in actual use, the sidewall of the needle roller 3 only contacts the beveled surface, effectively reducing the friction area between the needle roller 3 and the straight segment 211, thereby reducing frictional wear between the needle roller 3 and the cage. It also helps reduce frictional heat generation and lowers lubricant consumption. In the above scheme, setting a sloped surface can further reduce the contact area between the straight section 211 and the needle roller 3, thereby reducing friction. Setting a second oil groove is beneficial to further improve the flow of lubricating grease between the needle roller 3 and the window 13, which is conducive to further improving the lubrication effect. At the same time, setting the first oil groove, the second oil groove, and the oil ring groove also achieves the effect of reducing materials and weight.
[0041] Preferably, the bending angle of the C-shaped bend 212 is between 35° and 60°, and a first arc-shaped transition surface 2121 is provided on the side of the C-shaped bend 212 facing the window opening 13. A third oil passage gap 2122 exists between the first arc-shaped transition surface 2121 and the needle roller 3. By using an arc-shaped transition surface, stress can be effectively dispersed, avoiding stress concentration at the bending position that could reduce the structural strength of the bent window beam 2, thereby improving the durability and safety of the structure. It should also be noted that the above example is only a preferred example of this application. The arrangement of the C-shaped bend 212 in this application is not limited to the above example; other different arrangements can also be used, and this application does not specifically limit these arrangements.
[0042] In a preferred embodiment of this application, a wear-resistant coating is provided on the side of the support portion 21 facing the window opening 13, and a wear-resistant coating is also provided on the side of the spacer step 14 facing the window opening 13. By providing a wear-resistant coating, the wear resistance of the contact surface between the cage and the needle roller 3 can be improved, which is beneficial to further improving the durability and safety of the structure.
[0043] It should also be noted that the above example is only a preferred example of this application. The bending direction of the bent window beam 2 in this application is not limited to the above example. That is, the supporting part 21 can protrude into the inside of the annular body 1 along the radial direction of the annular body 1 relative to the first part 22 and the second part 23, as shown in the above example, or it can protrude outward from the annular body 1 along the radial direction of the annular body 1 relative to the first part 22 and the second part 23. This application does not make any specific limitation on this.
[0044] For any parts not mentioned in this application, existing technologies may be used or referenced.
[0045] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.
[0046] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A needle roller retainer, characterized in that, The device includes an annular body and window openings evenly arranged around the circumference of the annular body. A bent window beam is provided between two adjacent window openings. The annular body includes a first ring beam and a second ring beam. Along the axial direction of the annular body, there are spaced steps between the two ends of the window openings and the first and second ring beams. The bent window beam includes a support portion and a first part and a second part symmetrically arranged at both ends of the support portion. C-shaped bends are provided at both ends of the support portion. The support portion is connected to the first and second parts through the C-shaped bends. Along the radial direction of the annular body, the support portion protrudes into the annular body relative to the first and second parts. The first and second parts have a clearance portion on the side facing the window opening. A first oil passage gap is provided between the clearance portion and the needle roller.
2. The needle roller retainer as described in claim 1, characterized in that, Along the radial direction of the annular body, the first ring beam and the second ring beam are provided with extensions on the side facing the interior of the annular body, and at least a portion of the extensions have a second oil passage gap with the end face of the needle roller.
3. The needle roller retainer as described in claim 2, characterized in that, Along the axial direction of the annular body, the extension is provided with an oil-filled groove on the side facing the interior of the annular body.
4. The needle roller retainer as described in claim 1, characterized in that, The side of the interval step facing the window opening is provided with a first oil passage groove.
5. The needle roller retainer as described in claim 1, characterized in that, The supporting part also includes a straight segment, and the C-shaped bending segment is symmetrically arranged at both ends of the straight segment. The straight segment is connected to the first part and the second part through the C-shaped bending segment.
6. The needle roller retainer as described in claim 5, characterized in that, A second oil passage groove is provided on the side of the straight section facing the window opening.
7. The needle roller retainer as described in claim 5, characterized in that, The straight section is provided with a slope surface that contacts and engages with the needle roller.
8. The needle roller retainer as claimed in claim 1, characterized in that, The support portion is provided with a wear-resistant coating on the side facing the window opening, and the step-spaced portion is provided with a wear-resistant coating on the side facing the window opening.
9. The needle roller retainer as claimed in claim 1, characterized in that, The C-shaped bend section has a first arc-shaped transition surface on the side facing the window opening, and there is a third oil passage gap between the first arc-shaped transition surface and the needle roller.
10. The needle roller retainer as claimed in claim 1, characterized in that, The bending angle of the C-shaped bend ranges from 35° to 60°.