Grease leakage prevention bearing

Abstract

The utility model discloses a grease leakage prevention bearing which comprises an inner ring, an outer ring, a plurality of rolling bodies and a retainer, the rolling bodies and the retainer are arranged between the inner ring and the outer ring, the rolling bodies are installed in a plurality of bags of the retainer in a one-to-one correspondence mode, and the pitch diameter of the bags of the retainer is smaller than that of the bearing. According to the utility model, the sinkage of the retainer is adjusted by adjusting the size difference between the pitch diameter of the pocket of the retainer and the pitch diameter of the bearing, so that the rolling body is firstly contacted with the outer diameter of the retainer, the contact scraping between the inner ring of the retainer and the rolling body is avoided, and the lubricating grease scraped by the mutual operation of the retainer and the rolling body is reduced; a gap between the outer diameter of the inner ring of the bearing and the inner ring of the retainer is adjusted, so that a grease accumulation space at the gap is enlarged, and the accumulation and extrusion height of grease on a rolling body scraped by the retainer is reduced; the cross section area of the retainer is not changed, the strength and the operation stability of the retainer are maintained, and the service life of the retainer and the bearing is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to an anti-grease leakage bearing. Background Technology

[0002] In existing technologies, grease leakage inside sealed bearings leads to reduced bearing life and pollution of the bearing's operating environment, thus affecting the service life of various mechanical equipment using the bearing. Modifications to the sealing structure and reductions in the amount of grease sealed are effective countermeasures to prevent grease leakage. Grease leakage typically occurs between the inner surface of the relatively rotating seal ring and the sealing groove. To reduce grease leakage in sealed ball bearings, contact seals can employ measures such as increasing the "sealing lip's clamping force (the pressure of the sealing lip on the inner ring sealing groove)" and changing the shape of the sealing lip, but this results in increased bearing torque and higher costs. Reducing the amount of grease sealed is effective in reducing grease leakage, but it reduces the bearing's lubrication life.

[0003] Since the aforementioned grease leakage occurs between the relatively rotating sealing ring and the inner ring sealing groove, we consider controlling the amount of grease adhering at this point to reduce grease leakage. Grease leakage in contact-type sealing rings occurs as follows:

[0004] As the bearing rotates, the grease begins to move towards the inner ring seal groove;

[0005] The internal air expands due to the increase in bearing temperature;

[0006] The expanded air extends outwards from the seal, thus expelling the grease from the sealing lip.

[0007] In summary, to prevent grease leakage in contact-type sealed bearings, this invention improves the retainer, thereby controlling the amount of grease adhering at that location and reducing grease leakage. This reduces the risk of grease leakage, increases bearing life, extends the life of mechanical equipment, and lowers costs. Summary of the Invention

[0008] According to an embodiment of the present invention, a grease-proof bearing is provided, comprising an inner ring, an outer ring, a plurality of rolling elements and a retainer, wherein the plurality of rolling elements and the retainer are disposed between the inner ring and the outer ring, and the plurality of rolling elements are installed in a plurality of pockets of the retainer in a corresponding manner, wherein the pitch circle diameter of the retainer pockets is smaller than the pitch circle diameter of the bearing.

[0009] Furthermore, the difference between the pitch circle diameter of the retainer bag and the pitch circle diameter of the bearing is 3% to 4% of the rolling element diameter.

[0010] Furthermore, the retainer is made of cold-rolled low-carbon steel plate.

[0011] Furthermore, the retainer is either rivet-type or curved claw-type.

[0012] Furthermore, the ratio of the gap between the inner diameter of the retainer and the outer diameter of the inner ring to the diameter of the rolling element is 8.2% to 10.7%.

[0013] Furthermore, it also includes: a pair of sealing rings, the pair of sealing rings being disposed between the inner ring and the outer ring, and the pair of sealing rings being disposed at both ends of the retainer.

[0014] According to the embodiment of the present invention, the anti-grease leakage bearing adjusts the difference between the pitch circle diameter of the retainer bag and the pitch circle diameter of the bearing, thereby adjusting the sinking of the retainer. This ensures that the rolling element contacts the outer diameter of the retainer first, preventing contact and scraping between the inner ring of the retainer and the rolling element, and reducing the scraping of grease by the retainer and the rolling element during mutual rotation. Furthermore, adjusting the gap between the outer diameter of the bearing inner ring and the inner ring of the retainer increases the space for grease accumulation, reducing the height of grease accumulation and extrusion when it is scraped off the rolling element by the retainer. The cross-sectional area of ​​the retainer remains unchanged, maintaining the strength and operational stability of the retainer, and extending the life of the retainer and the bearing.

[0015] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the anti-grease-leakage bearing according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram comparing the anti-grease leakage bearing according to the present invention with that of the prior art;

[0018] Figure 3 This is a schematic diagram of the retainer of the anti-grease leakage bearing according to an embodiment of the present invention. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0020] First, combine Figures 1-3 The grease-proof bearing according to the embodiments of the present invention is used in various mechanical equipment and has a wide range of applications.

[0021] like Figures 1-3As shown, the anti-grease leakage bearing of this utility model embodiment includes an inner ring 1, an outer ring 2, a plurality of rolling elements 3, and a retainer 4. The plurality of rolling elements 3 and the retainer 4 are disposed between the inner ring 1 and the outer ring 2. The plurality of rolling elements 3 are installed one-to-one in a plurality of pockets 41 of the retainer 4. The plurality of pockets 41 are evenly spaced. The retainer 4 maintains a suitable distance between the plurality of rolling elements 3. The pitch circle diameter of the pockets 41 of the retainer 4 is smaller than the pitch circle diameter of the bearing to adjust the sinking amount of the retainer 4 so that the rolling elements 3 first contact the outer diameter of the retainer 4, avoiding contact and scraping between the inner ring of the retainer 4 and the rolling elements 3. The pitch circle diameter of the bearing is half of the sum of the inner diameter of the inner ring 1 and the outer diameter of the outer ring 2, thereby reducing the scraping of grease by the retainer 4 and the rolling elements 3 during mutual rotation. In this embodiment, the rolling elements 3 are steel balls.

[0022] Furthermore, such as Figures 1-3 As shown, in this embodiment, the difference between the pitch circle diameter of the retainer 4 pocket 41 and the pitch circle diameter of the bearing is 3% to 4% of the diameter of the rolling element 3. This ensures a moderate sinking. If the difference is too small, insufficient sinking will result in the retainer 4 failing to effectively guide the rolling element 3, leading to inner diameter contact. If the difference is too large, excessive sinking will cause deformation of the retainer 4 or unstable spacing of the rolling elements 3, affecting bearing performance. A difference range of 3% to 4% balances the sinking and bearing performance.

[0023] like Figure 2 As shown, the dashed line represents the original retainer 6, which is implemented as the retainer 4 of this utility model, where a is half the difference between the pitch circle diameter of the retainer 4 pocket 41 and the pitch circle diameter of the bearing.

[0024] Furthermore, in this embodiment, the retainer 4 is made of cold-rolled low-carbon steel plate, which is low in cost, easy to process, and has moderate strength.

[0025] Furthermore, in this embodiment, the retainer 4 is a rivet type or a curved claw type.

[0026] Furthermore, in this embodiment, the ratio of the distance h between the inner diameter of the retainer 4 and the outer diameter of the inner ring 1 to the diameter of the rolling element (h / rolling element diameter) is 8.2%~10.7%, while the existing ratio is 5%~7.6%. This invention increases the ratio by approximately 3%. Taking the 629 model bearing as an example, its inner ring 1 has an inner diameter of 9mm, the outer ring 2 has an outer diameter of 26mm, and the bearing thickness is 8mm. The distance h between the inner diameter of the retainer 4 and the outer diameter of the inner ring 1 is 0.24mm~0.36mm. We increase the distance h between the inner diameter of the retainer 4 and the outer diameter of the inner ring 1 to 0.39mm~0.51mm. Compared to the existing ratio, the distance h increases by 42%~62%. This value is adopted because, while ensuring that the cross-sectional area of ​​the retainer 4 remains unchanged (i.e., the strength remains unchanged), we maximize the distance h between the inner ring of the retainer 4 and the outer diameter of the bearing inner ring 1, thereby increasing the volume of this space to accommodate more grease and preventing excessive grease accumulation due to the small space, which would then squeeze into the sealing groove of the bearing inner ring 1.

[0027] Furthermore, such as Figures 1-3 As shown, in this embodiment, it also includes: a pair of sealing rings 5, which are disposed between the inner ring 1 and the outer ring 2, and are respectively disposed at both ends of the retainer 4. The sealing rings 5 ​​can block external contamination and seal the grease.

[0028] In this embodiment, a grease leakage comparison experiment was conducted between existing bearings and the bearing of this invention. The experimental data are shown below:

[0029] Leakage test conditions:

[0030] bearings 629LLU sample The existing design has 16 bearings, while this utility model has 16 bearings. rotational speed 6000 rpm, inner ring rotation Ambient temperature 100℃ Test time 72 hours

[0031] Results of the grease leakage test:

[0032] bearings Existing design This utility model Test results (number of leaks / total number) 5 / 16 0 / 16 Leakage rate 31.3% 0

[0033] The test results above show that this invention can significantly reduce the proportion of grease leakage.

[0034] Above, refer to Figures 1-3 This invention describes an anti-grease leakage bearing according to an embodiment of the present invention. By adjusting the dimensional difference between the cage pocket pitch circle diameter and the bearing pitch circle diameter, the cage's subsidence is adjusted, ensuring that the rolling elements contact the cage's outer diameter first. This avoids contact and scraping between the cage's inner ring and the rolling elements, reducing the amount of grease scraped out by the interaction between the cage and the rolling elements. Furthermore, adjusting the gap between the bearing's inner ring outer diameter and the cage's inner ring increases the space for grease accumulation, reducing the height of grease buildup when scraped out of the rolling elements by the cage. The cage's cross-sectional area remains unchanged, maintaining the cage's strength and operational stability, and extending the life of both the cage and the bearing.

[0035] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0036] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A leakage-proof grease bearing comprising an inner ring, an outer ring, a plurality of rolling elements, and a retainer, the plurality of rolling elements and the retainer being disposed between the inner ring and the outer ring, the plurality of rolling elements being one-to-one correspondingly installed in a plurality of pockets of the retainer, characterized in that, The pitch diameter of the retainer bag is less than the pitch diameter of the bearing.

2. The grease retaining bearing of claim 1 wherein, The difference between the pitch diameter of the retainer bag and the pitch diameter of the bearing is 3% to 4% of the diameter of the rolling body.

3. The grease retaining bearing of claim 1 wherein, The material of the retainer is a cold-rolled low-carbon steel plate.

4. The grease retaining bearing of claim 1 wherein, The retainer is a rivet type or a curved claw type.

5. The grease retaining bearing of claim 1 wherein, The ratio of the interval between the inner diameter of the retainer and the outer diameter of the inner ring to the diameter of the rolling body is 8.2% to 10.7%.

6. The bearing of any one of claims 1 to 5, wherein the bearing is a greaseless bearing. Further comprising: a pair of sealing rings, which are arranged between the inner ring and the outer ring, and are arranged at both ends of the retainer, respectively.

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