Sealed angular contact bearings

Abstract

This utility model discloses a sealed angular contact bearing, including an outer ring, an inner ring, a cage, and a plurality of rolling elements. The cage is disposed between the outer ring and the inner ring and has a plurality of pockets for accommodating the rolling elements. Grease passages are circumferentially formed on both sides of the outer diameter surface of the cage. The pockets evenly divide the grease passages into a plurality of grease grooves. Each grease groove communicates with two adjacent pockets. Both the inner circumferential wall of the outer ring and the outer circumferential wall of the inner ring are provided with flanges. The outer circumferential wall of the flanges has raceways for the rolling elements to roll on, with two raceways arranged opposite each other. A clearance fit is provided between the outer circumferential wall of the flanges and the outer diameter surface of the cage, and a limiting structure is provided between the outer circumferential wall of the flanges and the outer diameter surface of the cage to prevent cage displacement or uneven loading. This utility model solves the problem of the lack of a high-speed, high-efficiency lubricated, and high-reliability angular contact ball bearing in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically a sealed angular contact bearing. Background Technology

[0002] With the arrival of Industry 4.0, the manufacturing industry is accelerating its transformation towards green, efficient, and intelligent manufacturing. High-end equipment has placed higher demands on the performance of core components. Especially in key application scenarios such as high-speed spindles, angular contact ball bearings, as core transmission components, directly affect the working efficiency and service life of the entire machine due to their high-speed performance, lubrication reliability, and operational stability.

[0003] Existing angular contact ball bearings have the following shortcomings when operating at high speeds: On the one hand, the cage structure design is unreasonable, the grease storage is limited and the lubrication path is not smooth, making it difficult to form continuous and effective lubrication between the rolling elements, raceways and cage, which easily generates greater friction and heat, aggravates wear and causes high-frequency vibration, affecting the high-speed performance and service life of the bearing; on the other hand, the raceway curvature design of some bearing rings is not adapted to high-speed operating conditions, the friction area of ​​the contact area between the rolling elements and raceways is large, which further increases the running torque and temperature rise, and the fit structure between the flange and the cage is not optimized, which easily leads to cage displacement or uneven loading, resulting in a decrease in bearing reliability. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sealed angular contact bearing, which solves the problem of the lack of a high-speed, high-efficiency lubricated and high-reliability angular contact ball bearing in the existing technology.

[0005] To achieve the above objectives, this utility model provides a sealed angular contact bearing, including an outer ring, an inner ring, a cage, and a plurality of rolling elements. The cage is disposed between the outer ring and the inner ring and has a plurality of pockets for accommodating the rolling elements. Grease passages are circumferentially formed on both sides of the outer diameter surface of the cage. The plurality of pockets evenly divide the grease passages into a plurality of grease grooves. Each grease groove is connected to two adjacent pockets. A retaining edge is provided on the inner peripheral wall of the outer ring and the outer peripheral wall of the inner ring. A raceway for the rolling elements is formed on the outer peripheral wall of the retaining edge. Two raceways are arranged opposite to each other. A clearance fit is provided between the outer peripheral wall of the retaining edge and the outer diameter surface of the cage, and a limiting structure is provided between the outer peripheral wall of the retaining edge and the outer diameter surface of the cage to prevent the cage from shifting or being overloaded.

[0006] The advantages of adopting the above technical solution are as follows: By setting a grease filling oil passage on the outer diameter surface of the cage and dividing it into a grease filling groove by a pocket, and with the grease filling groove connected to the pocket, the storage space for grease is significantly increased. At the same time, an efficient lubrication path is constructed to ensure that the rolling elements, raceways, and cage can continuously obtain lubrication during high-speed operation, reducing friction and wear. The clearance fit between the flange and the cage reduces the friction area, and the limiting structure effectively prevents cage displacement or uneven loading, improving the stability of the bearing during high-speed operation. This solves the problems of insufficient lubrication and easy uneven loading in traditional bearings, and is suitable for the high reliability requirements of high-speed spindles.

[0007] The present invention further provides that the bottom wall of the grease filling groove opening and the inner peripheral wall of the pocket are connected by a smooth arc surface and form a grease guiding surface.

[0008] The advantages of adopting the above technical solution are: the smooth arc surface of the grease groove opening and the pocket opening in the above technology forms a grease guiding surface, which can guide the grease to flow more smoothly from the grease groove into the pocket, avoid grease retention or accumulation caused by structural sharp edges, ensure that the grease can reach the contact area between the rolling elements and the raceway and the cage pocket efficiently, and improve the uniformity of lubrication; at the same time, it reduces the grease flow resistance, helps the grease to circulate under the action of centrifugal force during high-speed operation, ensures continuous lubrication, reduces friction, temperature rise and vibration caused by uneven grease distribution, and extends the service life of the bearing.

[0009] The present invention further includes: two grease reservoirs are hollowed out on the inner peripheral wall of the pocket, the two grease reservoirs are arranged opposite to each other, and the grease reservoirs are connected to the pocket.

[0010] The advantages of adopting the above technical solution are as follows: The two opposing grease reservoirs on the inner circumferential wall of the pocket increase the grease storage capacity, continuously replenishing grease to the contact area between the rolling elements and the cage during high-speed operation, thus preventing lubrication interruption; on the other hand, they reduce the direct contact area between the rolling elements and the pocket, reducing frictional resistance and wear, and reducing heat generation; at the same time, the grease reservoirs can accommodate small abrasive particles and other foreign objects, preventing foreign objects from aggravating wear, improving the stability of the rolling element operation, and optimizing the bearing vibration performance and reliability.

[0011] The present invention further comprises: the limiting structure including a first limiting edge disposed on the outer diameter surface of the retainer and a second limiting edge disposed on the inner peripheral wall of the outer ring, the first limiting edge and the second limiting edge being configured with a clearance fit, the outer wall of the first limiting edge being connected to the top wall with a smooth curved surface and forming a first inclined surface, the inner wall of the second limiting edge being connected to the top wall with a smooth curved surface and forming a second inclined surface, the first inclined surface and the second inclined surface being opposite to and parallel to each other, the first inclined surface and the second inclined surface being configured with a clearance fit, and the first limiting edge being positioned near the retaining edge of the inner ring.

[0012] The advantages of adopting the above technical solution are as follows: The design of the first and second limiting edges and the parallel inclined surface of the limiting structure in the above technology can accurately limit the displacement or off-center loading of the cage while ensuring the clearance fit between the cage and the flange; the parallel setting of the inclined surface reduces the contact friction area, reduces friction noise and wear during high-speed operation, and improves the stability of the cage movement; it effectively avoids problems such as uneven rolling element force and accelerated raceway wear caused by cage off-center loading, extends the bearing service life, and meets the high stability requirements of high-speed operating conditions; at the same time, the first limiting edge in the above technology is set close to the flange of the inner ring, that is, the first limiting edge is far away from the flange of the outer ring, so that when the cage moves off-center towards the flange of the outer ring, it will be limited by the flange of the outer ring and the gap between the right side of the cage and the flange of the outer ring, while the left side of the cage is limited by the first limiting edge to avoid cage off-center loading.

[0013] The present invention further comprises: a rolling cavity is formed between the outer ring and the inner ring; two sealing rings are used to seal the outer ring and the inner ring; the two sealing rings are respectively disposed on both sides of the cage and the combination of the two sealing rings achieves the sealing of the rolling cavity.

[0014] The advantages of adopting the above technical solution are as follows: the sealing fit between the two sealing rings and the rolling cavity can effectively prevent external dust, impurities and other foreign objects from entering the bearing, avoiding contamination of the grease or aggravation of wear between the rolling elements and the raceway; at the same time, it prevents the internal grease from being lost due to centrifugal force during high-speed operation, maintains the working state of the grease, and ensures a long-term effective lubrication environment; it eliminates the need for a complex oil-air lubrication system, reduces maintenance costs, improves the bearing's adaptability to harsh environments, and ensures long-term stable operation of the high-speed spindle; in the above technology, the outer peripheral wall of the sealing ring and the outer ring can be connected by a stamping process, while the inner peripheral wall of the sealing ring and the inner ring are tightened together, thereby improving the sealing performance of the rolling cavity.

[0015] The present invention further comprises: the rolling element is a ceramic ball.

[0016] The advantages of adopting the above technical solution are: the rolling elements in the above technology are ceramic balls, whose material properties result in a lower coefficient of friction with the raceway during high-speed operation, which can reduce the heat generated by friction and reduce the bearing temperature rise; the high strength and wear resistance of ceramic balls can reduce the amount of wear during rolling and extend the service life; at the same time, their low density characteristics reduce the centrifugal force during high-speed operation, reduce the impact and wear on the cage, improve the stability of the bearing during high-speed operation, and meet the requirements of high-speed spindles for low temperature rise and low vibration. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention;

[0018] Figure 2This is a partial three-dimensional view of the present invention;

[0019] Figure 3 for Figure 2 The front view;

[0020] Figure 4 This is a partial three-dimensional view of the cage in this utility model. Detailed Implementation

[0021] This utility model provides a sealed angular contact bearing, including an outer ring 1, an inner ring 2, a cage 3, and a plurality of rolling elements 11. The cage 3 is disposed between the outer ring 1 and the inner ring 2, and has a plurality of pockets 31 for accommodating the rolling elements 11. Grease passages are circumferentially formed on both sides of the outer diameter surface of the cage 3. The pockets 31 evenly divide the grease passages into a plurality of grease grooves 32. Each grease groove 32 is connected to two adjacent pockets 31. The outer ring 1... Both the inner peripheral wall and the outer peripheral wall of the inner ring 2 are provided with a retaining edge 21. The outer peripheral wall of the retaining edge 21 has a raceway 211 for the rolling element 11 to roll. The two raceways 211 are arranged opposite to each other. The outer peripheral wall of the retaining edge 21 is clearance-fitted with the outer diameter surface of the cage 3, and a limiting structure is provided between the outer peripheral wall of the retaining edge 21 and the outer diameter surface of the cage 3 to prevent the cage 3 from shifting or being overloaded. The bottom wall of the opening of the grease groove 32 is connected to the inner peripheral wall of the pocket 31 with a smooth arc surface and forms a grease guiding surface 33. The pocket Two grease reservoirs 34 are hollowed out on the inner peripheral wall of the retainer 31. The two grease reservoirs 34 are arranged opposite each other and are connected to the pocket 31. The limiting structure includes a first limiting edge 35 on the outer diameter surface of the retainer 3 and a second limiting edge 12 on both sides of the inner peripheral wall of the outer ring 1. The first limiting edge 35 and the second limiting edge 12 are respectively fitted with a clearance. The outer wall of the first limiting edge 35 is smoothly curved and connected to the top wall, forming a first inclined surface 351. The inner wall of the second limiting edge 12... The outer ring 1 and the inner ring 2 are connected by a smooth curved surface and a second inclined surface 121 is formed. The first inclined surface 351 and the second inclined surface 121 are opposite to and parallel to each other. The first inclined surface 351 and the second inclined surface 121 are fitted with a clearance. A rolling cavity 22 is formed between the outer ring 1 and the inner ring 2. Two sealing rings 4 are sealed between the outer ring 1 and the inner ring 2. The two sealing rings 4 are respectively located on both sides of the cage 3 and the two sealing rings 4 are combined to seal the rolling cavity 22. The rolling element 11 is a ceramic ball.

[0022] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A sealed angular contact bearing, comprising an outer ring, an inner ring, a cage, and a plurality of rolling elements, wherein the cage is disposed between the outer ring and the inner ring and has a plurality of pockets for accommodating the rolling elements, characterized in that: The cage has grease-filling passages circumferentially opened on both sides of its outer diameter surface. Several pockets evenly divide the grease-filling passages into several grease-filling grooves. Each grease-filling groove is connected to two adjacent pockets. The inner circumferential wall of the outer ring and the outer circumferential wall of the inner ring are provided with a retaining edge. The outer circumferential wall of the retaining edge is provided with a raceway for the rolling elements to roll. Two raceways are arranged opposite to each other. The outer circumferential wall of the retaining edge is clearance-fitted with the outer diameter surface of the cage, and a limiting structure is provided between the outer circumferential wall of the retaining edge and the outer diameter surface of the cage to prevent the cage from shifting or being overloaded.

2. A sealed angular contact bearing according to claim 1, wherein: The bottom wall of the grease filling groove opening is connected to the inner peripheral wall of the pocket with a smooth arc surface, forming a grease guiding surface.

3. A sealed angular contact bearing according to claim 1, wherein: Two grease reservoirs are hollowed out on the inner peripheral wall of the pocket, and the two grease reservoirs are arranged opposite each other and are connected to the pocket.

4. A sealed angular contact bearing according to claim 1, wherein: The limiting structure includes a first limiting edge on the outer diameter surface of the retainer and a second limiting edge on the inner peripheral wall of the outer ring. The first limiting edge and the second limiting edge are configured with a clearance fit. The outer wall of the first limiting edge is connected to the top wall with a smooth curved surface and forms a first inclined surface. The inner wall of the second limiting edge is connected to the top wall with a smooth curved surface and forms a second inclined surface. The first inclined surface and the second inclined surface are opposite to and parallel to each other. The first inclined surface and the second inclined surface are configured with a clearance fit. The first limiting edge is located near the retaining edge of the inner ring.

5. A sealed angular contact bearing according to claim 1, wherein: A rolling cavity is formed between the outer ring and the inner ring. Two sealing rings are used to seal the outer ring and the inner ring. The two sealing rings are located on both sides of the cage and the combination of the two sealing rings achieves the sealing of the rolling cavity.

6. A sealed angular contact bearing according to claim 1, wherein: The rolling element is a ceramic ball.

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