Roller needle bearing capable of supplementing lubricating grease
Through the design of oil injection holes and oil grooves on the inner ring of the roller -rolling needle bearing, the problem of lubricating oil loss of the bearing is solved, the lubrication supplement is achieved, and the service life and production efficiency of the bearings are improved.
Patent Information
- Application Number
- CN202323617282.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2033-12-28
AI Technical Summary
During the use of roller needle bearings, due to the increase in temperature and relative movement of parts, the viscosity of lubricating grease decreases, resulting in loss of grease, resulting in poor lubrication, increased friction torque and early failure. The prior art is difficult to achieve additional lubrication of bearings, and it is cumbersome to disassemble parts and replenish grease and is not recommended.
There are multiple oil injection holes and oil grooves connected to the inner and outer walls on the inner ring of the roller -rolling needle bearings. The oil is injected into the oil groove through the oil injection device and entered the bearing inside through the fuel injection hole to achieve the supplement of lubrication.
The design enables the bearings to easily supplement lubricating oil, avoid the problems of poor lubrication and early failure, and improve the service life and production efficiency of the bearings.
Smart Images
Figure CN222415645U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearings, in particular to a roller needle bearing capable of replenishing lubricating grease. Background Art
[0002] The roller needle bearing has a thick outer ring. The outer ring can roll directly on the raceway as a supporting roller and can withstand large loads. When this type of bearing is working, the outer ring performs cyclic or reciprocating motion on the plane raceway. The roller needle bearing is suitable for low-speed and heavy-load conditions. In order to maximize the bearing's load-bearing capacity, the bearing is designed as a full-fill needle roller structure, that is, there is no cage structure in the bearing.
[0003] Roller and needle bearings are generally grease lubricated. Due to the special structure of the bearing, the grease needs to be injected into the bearing before the bearing parts are assembled, that is, into the space formed by the inner ring raceway, outer ring raceway and needle roller of the bearing, and then the interference fit of the bearing retaining ring is completed. At this point, the various parts of the bearing including the grease become a complete whole. In the later stage, the bearing cannot be relubricated during the use of the bearing. However, in actual work, due to the increase in working temperature and the relative movement between the various parts inside the bearing, the viscosity of the grease inside the bearing will decrease, the grease state will change, and the grease will be lost. Although there is a sealing ring inside the bearing, which can prevent the loss of grease to a certain extent, grease loss is inevitable, and as the movement occurs, the grease inside the bearing becomes less and less, which will lead to poor bearing lubrication, increased bearing friction torque and early failure of the bearing due to poor lubrication.
[0004] Due to the special working environment of this series of roller and needle bearings, the bearings need to be exposed to the external environment, and the corrosion resistance of the bearings is required to be high. In order to meet the corrosion resistance requirements, the bearing parts are surface treated. Once the bearing parts are disassembled, the interference fit surface of the retaining ring and the surface treatment layer of other parts will be damaged, reducing the bearing performance, and in severe cases, the bearing will be scrapped. In addition, disassembling and relubricating the bearing parts also requires the use of special tooling for disassembly, loss of parts such as needle rollers, and cumbersome and time-consuming disassembly and reassembly. Therefore, it is not recommended to relubricate the bearing by disassembling the bearing parts after the bearing grease is lost.
[0005] In order to avoid the problems caused by the loss of lubricating grease, it is necessary to regularly add lubricating grease to the bearing in the working gap of the bearing, and lubrication can only be added by external grease injection. The outer ring of the bearing is the main force-bearing part of the bearing as a supporting roller. Drilling oil holes in the outer ring of the bearing will destroy the integrity of the outer ring structure and reduce the performance and life of the bearing. Therefore, the oil holes of the bearing cannot be designed in the outer ring like conventional rolling bearings.
[0006] In order to solve the above problems, the present utility model is provided. Utility Model Content
[0007] The utility model aims to provide a roller needle bearing capable of replenishing lubricating grease, which is convenient for oiling the bearing.
[0008] Based on the above problems, the technical solution provided by the utility model is:
[0009] A roller needle bearing capable of replenishing lubricating grease comprises an inner ring, an outer ring arranged outside the inner ring in the circumferential direction, a needle roller assembly arranged between the inner ring and the outer ring, a retaining ring arranged on both axial sides of the inner ring, and a sealing ring arranged between the retaining ring and the outer ring.
[0010] The inner ring is provided with a plurality of oil injection holes connecting the inner wall and the outer wall, and the plurality of oil injection holes are arranged at intervals along the circumference of the inner ring. The inner wall of the inner ring is provided with an oil groove connecting the plurality of oil injection holes, and the oil groove is a circle of grooves recessed from the inner wall of the inner ring to the outer wall and arranged along the circumference of the inner ring.
[0011] In some of the embodiments, the plurality of oil injection holes are evenly spaced apart.
[0012] In some embodiments, the number of the oil injection holes is two or four.
[0013] In some embodiments, the angle between the two side walls of the oil groove is 90° to 135°.
[0014] In some embodiments, the width of the oil groove is 2 to 6 times the diameter of the oil injection hole.
[0015] In some of the embodiments, the diameter of the oil injection hole is 1 to 3 mm.
[0016] In some embodiments, the depth of the oil groove is 0.5-3 mm.
[0017] Compared with the prior art, the advantages of the utility model are:
[0018] An oil filling hole and an oil groove are arranged on the inner ring. By extending the oil filling device into the shaft hole of the inner ring, oil can be filled into the inner ring of the bearing through the oil groove and the oil filling hole, which is easy to operate and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1It is a structural schematic diagram of an embodiment of a roller needle bearing capable of replenishing lubricating grease according to the utility model;
[0021] Figure 2 for Figure 1 AA cross-sectional diagram of ;
[0022] Figure 3 This is a schematic diagram of the use state of an embodiment of the utility model;
[0023] in:
[0024] 1. Inner ring; 1-1. Oil filling hole; 1-2. Oil groove;
[0025] 2. Outer ring;
[0026] 3. Needle roller assembly;
[0027] 4. Retaining ring;
[0028] 5. Sealing ring;
[0029] 6. Oil filling device; 6-1. Oil filling chamber; 6-2. Oil outlet;
[0030] 7. Grease nozzle. DETAILED DESCRIPTION
[0031] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model and are not limited to the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.
[0032] like Figure 1 and Figure 2 As shown, an embodiment of the utility model is provided, which provides a roller needle bearing capable of replenishing lubricating grease, comprising an inner ring 1, an outer ring 2 arranged on the circumferential outside of the inner ring 1, a needle roller assembly 3 arranged between the inner ring 1 and the outer ring 2, a retaining ring 4 arranged on both axial sides of the inner ring 1, and a sealing ring 5 arranged between the retaining ring 4 and the outer ring 2.
[0033] In order to facilitate the oil filling of the bearing, a plurality of oil filling holes 1-1 connecting the inner wall and the outer wall are provided on the inner ring 1. The plurality of oil filling holes 1-1 are arranged at intervals along the circumference of the inner ring 1. At the same time, an oil groove 1-2 connecting the plurality of oil filling holes 1-1 is provided on the inner wall of the inner ring 1. The oil groove 1-2 is a circle of grooves that are recessed from the inner wall of the inner ring 1 to the outer wall 2 and are arranged along the circumference of the inner ring 1.
[0034] Correspondingly, the utility model also relates to an oil injection device 6 for injecting oil into the bearing, such as Figure 3As shown, the oil filling device 6 is a tubular body with one end blocked, the tubular body having an oil filling cavity 6-1, and a plurality of oil outlets 6-2 connected to the oil filling cavity 6-1 are provided on the outer wall of the tubular body. The oil filling device 6 is extended into the axial hole of the inner ring 1 so that the plurality of oil outlets 6-2 are aligned with the oil groove 1-2, and oil is filled into the oil groove 1-2, and further oil is filled into the bearing through the plurality of oil filling holes 1-1.
[0035] The nominal outer diameter of miniature and small roller needle bearings is generally below 65mm, and the inner diameter of the bearing is generally below 30mm, or even below 10mm. Therefore, it is difficult to align the outlet of the oiling nozzle 7 directly with the oiling hole 1-1 on the inner diameter of the inner ring 1 of the roller needle bearing, which makes it difficult to replenish the oil of the bearing. An oil groove 1-2 is provided, and the oil outlet 6-2 of the oiling device 6 can discharge oil as long as it is within the range of the oil groove 1-2. There is no need to align the oil outlet 6-2 with each oiling hole 1-1, thereby improving the oiling efficiency.
[0036] The diameter of the oil injection hole 1-1 is 1 to 3 mm, and the width of the oil groove 1-2 is relatively large, which is 2 to 6 times the diameter of the oil injection hole 1-1. In order to take into account the strength of the inner ring 1, the depth of the oil groove 1-2 should be as small as possible, generally set to 0.5 to 3 mm.
[0037] In order to avoid the loss of grease during bearing operation, the number of oil injection holes 1-1 should be as small as possible. Considering the uniformity of oil injection, multiple oil injection holes 1-1 are evenly spaced, and generally two or four are used.
[0038] In order to reduce the influence of the oil groove 1-2 on the inner wall of the inner ring 1 on the strength of the inner ring 1, the angle a between the two side walls of the oil groove 1-2 is 90°~135 (such as Figure 1 As shown), a sharp angle between the bottom and the side wall of the oil groove 1-2 is avoided, thereby avoiding stress concentration leading to bearing failure.
[0039] like Figure 3 As shown, when in use, the oil filling device 6 is extended to the axial hole of the inner ring 1, so that the multiple oil outlets 6-2 on the oil filling device 6 are aligned with the oil groove 1-2 on the inner ring 1, and the oil filling nozzle 7 is abutted against the end face inlet of the oil filling device 6, and grease is added to the oil filling device 6. After the grease fills the oil groove 1-2, it enters the interior of the bearing through the oil filling hole 1-1 under the action of pressure, thereby achieving lubrication, reducing bearing wear, and increasing its service life.
[0040] In summary, the roller needle bearing is convenient for oiling and can improve production efficiency and service life.
[0041] The above examples are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A roller needle bearing capable of replenishing lubricating grease, comprising an inner ring, an outer ring arranged outside the inner ring in the circumferential direction, a needle roller assembly arranged between the inner ring and the outer ring, a retaining ring arranged on both axial sides of the inner ring, and a sealing ring arranged between the retaining ring and the outer ring, characterized in that: The inner ring is provided with a plurality of oil injection holes connecting the inner wall and the outer wall, and the plurality of oil injection holes are arranged at intervals along the circumference of the inner ring. The inner wall of the inner ring is provided with an oil groove connecting the plurality of oil injection holes, and the oil groove is a circle of grooves recessed from the inner wall of the inner ring to the outer wall and arranged along the circumference of the inner ring.
2. The roller needle bearing capable of replenishing lubricating grease according to claim 1, characterized in that: The plurality of oil injection holes are evenly spaced and arranged.
3. The roller needle bearing capable of replenishing lubricating grease according to claim 2, characterized in that: The number of the oil filling holes is two or four.
4. The roller needle bearing capable of replenishing lubricating grease according to claim 1, characterized in that: The angle between the two side walls of the oil groove is 90° to 135°.
5. The roller needle bearing capable of replenishing lubricating grease according to claim 1, characterized in that: The diameter of the oil injection hole is 1 to 3 mm.
6. The roller needle bearing capable of replenishing lubricating grease according to claim 5, characterized in that: The width of the oil groove is 2 to 6 times the diameter of the oil injection hole.
7. The roller needle bearing capable of replenishing lubricating grease according to claim 6, characterized in that: The depth of the oil groove is 0.5-3 mm.