Radial thrust bearing

Abstract

This invention relates to the field of radial thrust bearing technology, specifically a radial thrust bearing comprising an inner ring, an outer ring, a cage, and balls, and a circulation mechanism. The inner ring is fitted inside the outer ring, and the balls are rolled and embedded between the inner and outer rings. The cage is installed between the inner and outer rings, with the balls located on the cage. The circulation mechanism is installed on both sides of the outer ring. This invention solves the problem that existing bearings still generate high internal temperatures at high speeds. High temperatures reduce the viscosity of the lubricating oil, leading to a thinner oil film, increased friction, and ultimately, accelerated bearing temperature rise. Excessive bearing operating temperature can cause the bearing to seize due to thermal stress. This invention achieves uniform heat transfer from the lubricating oil at high speeds, preventing the bearing from seizing due to excessive operating temperature.

Description

Technical Field

[0001] This invention relates to the field of radial thrust bearing technology, specifically a radial thrust bearing. Background Technology

[0002] Radial thrust bearings are sliding bearings that simultaneously bear radial and axial loads. They include angular contact ball bearings and tapered roller bearings. Angular contact ball bearings can withstand high speeds and a certain axial force, while tapered roller bearings can withstand lower speeds but greater axial forces. Flat-mounted high-speed motors typically use angular contact ball bearings. Angular contact ball bearings are usually available in single-row and double-row configurations. Single-row angular contact ball bearings can only bear axial loads in one direction. When bearing radial loads, they will generate additional axial forces and can only restrict the axial displacement of the shaft or housing in one direction. Double-row angular contact ball bearings can withstand combined radial and axial loads, primarily radial loads, as well as torque loads, and restrict the axial displacement of the shaft in both directions.

[0003] During the operation of angular contact ball bearings, rolling friction causes the bearing to heat up and wear. To reduce friction and damage, angular contact ball bearings need to be lubricated before use. Oil lubrication and grease lubrication are commonly used, both aiming to form an oil film on the contact surface between the bearing balls and the bearing, reducing wear and preventing abnormal bearing temperature rise. Compared to lubricating oil, grease has a higher viscosity and forms an oil film more easily, but it also has a larger frictional torque, making it less suitable for high-speed angular contact ball bearings. For high-speed angular contact ball bearings, oil lubrication is generally used, achieving good cooling effects. However, the excessively high speed of high-speed motors can still generate high internal temperatures. These high temperatures reduce the viscosity of the lubricating oil, thinning the oil film and increasing friction, ultimately exacerbating the bearing's temperature rise. Excessively high bearing operating temperatures can cause the bearing to seize due to thermal stress, resulting in bearing damage.

[0004] In view of this, and to address the aforementioned shortcomings, the present invention develops a radial thrust bearing. Summary of the Invention

[0005] The technical problem to be solved by this invention is that existing bearings still generate high internal temperatures at high speeds. High temperatures reduce the viscosity of the lubricating oil, resulting in a thinner oil film, increased friction, and ultimately exacerbating the temperature rise of the bearing. If the bearing operating temperature is too high, it will seize due to thermal stress, thus causing bearing damage.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a radial thrust bearing, comprising an inner bearing ring, an outer bearing ring, a cage, and balls, and further comprising a circulation mechanism. The inner bearing ring is fitted inside the outer bearing ring, and the balls are rolled and embedded between the inner and outer bearing rings. The cage is installed between the inner and outer bearing rings, and the balls are located on the cage. The circulation mechanism is installed on both sides of the outer bearing ring. The circulation mechanism uses the centrifugal force generated by the rotation of the bearing to circulate the lubricating oil inside the bearing and to perform heat exchange on the bearing.

[0007] The balls are confined within the cage, with a certain distance between them. This is to ensure that the bearing is subjected to uniform force, preventing excessive local stress that could cause internal cracks and damage to the bearing and the motor. The circulation mechanism circulates the lubricating oil inside the bearing, distributing the heat of the lubricating oil evenly through contact with the circulation mechanism and then dissipating the heat through contact with the air. This prevents the oil film from failing and protects the bearing.

[0008] Preferably, the circulation mechanism includes a heat-conducting ring, an oil inlet pipe, a guide pipe, an oil outlet pipe, a flow pipe, and a filter module. The heat-conducting ring is a circular ring structure, and the circular ring structure is fixedly installed on both sides of the outer ring of the bearing. An oil inlet pipe is opened inside one end of the heat-conducting ring. A guide pipe communicating with the oil inlet pipe is opened inside the outer ring of the bearing. A flow pipe communicating with the oil outlet pipe is opened inside the outer ring of the bearing. Filter modules are fixedly installed at both ends of the oil inlet pipe. The filter modules filter out impurities in the lubricating oil through gravity sedimentation and allow the oil to circulate inside the bearing for lubrication and cooling.

[0009] During bearing operation, the inner ring and balls drive the lubricating oil in the bearing to rotate together. The rotating lubricating oil is moved towards the central recess of the inner wall of the outer ring under the action of centrifugal force. As the high-speed motor drives the bearing to rotate faster and faster, the pressure of the lubricating oil on the inner wall of the outer ring of the bearing gradually increases under the action of centrifugal force. When the lubricating oil makes a circular motion in the outer ring of the bearing, the lubricating oil enters from the oil inlet pipe. Since the heat-conducting ring is connected to the outer ring of the bearing and does not participate in the rotation, the lubricating oil flows into the oil outlet pipe after flowing into the oil inlet pipe due to gravity. Finally, the pressure generated by the height difference causes the lubricating oil to flow back from the flow pipe to the bearing. By setting up a circulation mechanism, the temperature inside the bearing is transferred and diffused through the lubricating oil as a medium, avoiding the problem of abnormal bearing temperature rise caused by the decrease in lubricating oil viscosity due to excessive temperature and the failure of the oil film. This prevents the bearing from seizing due to abnormal temperature rise.

[0010] Preferably, the filtration module includes a sealing column and a filter screen. The sealing column is fixedly installed on the heat-conducting ring, and the filter screen is fixedly installed on the sealing column. The sealing column has a cylindrical structure, and the lower end of the cylindrical structure has a circular hole that communicates with the oil outlet pipe. The sealing column seals and filters the oil and guides the oil to the circulation mechanism for circulation.

[0011] An arc-shaped groove is provided at one end of the sealing column, and an oil distribution plate is provided at the other end of the sealing column to divide the oil. The oil distribution plate is fixedly installed between the filter screens. A collection box for collecting and filtering impurities in the oil is installed on the sealing column to ensure the purity of the lubricating oil inside the circulation mechanism. The top edge of the collection box is connected to one end of the filter screen. The collection box is located below the oil distribution plate and a gap is left between it and the oil distribution plate. Impurities enter the collection box through the gap. A cross groove is provided at the top of the sealing column.

[0012] When lubricating oil flows from the inlet pipe into the sealing column, it first contacts the oil separator and is diverted to the filter screens on both sides. A portion of the clean lubricating oil flows through the filter screen into the outlet pipe, while impurities in the lubricating oil are intercepted by the filter screen and flow into the collection box with the lubricating oil. In the collection box, the impurities gradually sink to the bottom due to gravity and separate from the lubricating oil. The lubricating oil that has settled on the top layer flows into the outlet pipe from the filter screen after the collection box is full. After prolonged high-temperature operation, bearing lubricating oil inevitably produces carbon deposits, which darken the lubricating oil and increase its viscosity, leading to increased bearing friction and higher operating temperature. By setting up a filter module to filter impurities in the lubricating oil into the collection box, the lubricating oil flowing into the bearing always maintains a suitable viscosity, avoiding bearing overheating due to increased lubricating oil viscosity. By tilting the filter screen, the lubricating oil can easily flush the impurities on the filter screen into the collection box, preventing impurities from settling and clogging the filter screen mesh over long-term use.

[0013] Preferably, the heat-conducting ring has an oil reservoir for storing lubricating oil and provides circulating lubricating oil to the circulation mechanism. The oil reservoir is a semi-arc cavity, with its two ends connected to a sealing column and an oil outlet pipe, respectively. A high-temperature resistant transparent cover is installed on one outer surface of the heat-conducting ring, and the high-temperature resistant transparent cover cooperates with the oil reservoir.

[0014] Existing bearings, after less than six months of operation following manufacturing, have essentially lost all their internal lubricating oil. This leads to increased friction during operation, accelerating bearing damage. By installing an oil reservoir, the bearing can hold more lubricating oil. Combined with a transparent cover, the current oil level in the reservoir is visible. When insufficient lubricating oil is detected, the reservoir can be removed and new lubricating oil added without disassembling the bearing to check the oil content. When installed as a motor spindle bearing, the bearing housing should not obstruct the oil reservoir connected to the bearing's outer ring in the axial direction. The bearing's axial ends should not be in close contact with other equipment on the same shaft, as this would hinder heat dissipation and prevent the observation of the current oil level through the high-temperature resistant transparent cover.

[0015] Preferably, the opening of the guide tube is a crescent-shaped structure, through which the lubricating oil flowing inside the circulation mechanism flows tangentially into the guide tube and circulates.

[0016] The crescent-shaped opening of the guide tube is designed to ensure that the lubricating oil flows tangentially into the guide tube when the bearing rotates to the top, regardless of whether the bearing rotates clockwise or counterclockwise. Because the opening of the guide tube is crescent-shaped and the diameter of the guide tube is smaller than the opening, according to Bernoulli's principle, the flow rate of the lubricating oil increases after entering the guide tube from the opening, which accelerates the circulation of the lubricating oil in the bearing and improves the cooling effect on the bearing.

[0017] Preferably, the heat-conducting ring has symmetrical arc-shaped grooves on both sides, and a circular through hole at the bottom of the arc-shaped grooves. A heat pipe is fixedly installed on the inner wall of the heat-conducting ring in close contact with the oil storage box. The heat pipe has a wool core inside, which is used to exchange heat with the lubricating oil flowing inside the circulation mechanism. A heat sink is installed on the heat pipe. The heat sink has a rectangular structure. The rectangular structure of the heat sink increases the contact area with the air, so as to evenly dissipate the heat in the lubricating oil and provide cooling lubricating oil for the circulation mechanism.

[0018] When the high-temperature lubricating oil flows from the inlet pipe into the oil reservoir, the heat of the lubricating oil is transferred through the thin wall between the oil reservoir and the heat pipe. When one end of the heat pipe is heated, the liquid in the capillary core of the heat pipe evaporates and vaporizes. The vapor flows to the other end under a small pressure difference, releasing heat and condensing into liquid. The liquid then flows back to the evaporation section along the porous material by capillary force. This cycle continues, and heat is transferred from one end of the heat pipe to the other. Subsequently, the heat of the lubricating oil is transferred to the heat sink through the heat pipe, and then the heat sink releases heat through contact with the air. By using the heat pipe for auxiliary heat conduction, the heat conduction efficiency is higher and the heat conduction is more uniform, allowing the heat sink to achieve better heat dissipation. The distance between any two heat sinks is equal to ensure airflow and contact area, increasing the heat dissipation effect. Compared to relying solely on the heat-conducting ring to diffuse heat, the heat conduction speed is significantly improved with the addition of the heat pipe, effectively reducing the operating temperature of the bearing and allowing the bearing to maintain good operating conditions even at high speeds.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention reduces the operating temperature of the bearing and lubricating oil by setting up a circulation mechanism and uniformly contacting the heat of the lubricating oil with the heat-conducting ring for heat conduction, and dissipating the heat through contact with air. This prevents the bearing from seizing due to the failure of the lubricating oil film caused by excessive temperature. In conjunction with the filtration module, carbon deposits generated in the lubricating oil after prolonged high-temperature operation are filtered into the collection box, ensuring that the lubricating oil flowing into the bearing always maintains a suitable viscosity, thus avoiding the bearing overheating caused by excessive impurities in the lubricating oil leading to increased viscosity.

[0021] 2. This invention sets the opening of the guide tube to a crescent shape, so that whether the bearing rotates forward or backward, the lubricating oil flows into the guide tube tangentially when it rotates to the top. At the opening angle with the same direction as the lubricating oil, the lubricating oil will also accumulate. According to Bernoulli's principle, the flow rate of the lubricating oil increases after entering the guide tube from the opening, which accelerates the circulation of the lubricating oil in the bearing and improves the cooling effect on the bearing.

[0022] 3. By using a heat pipe in conjunction with a heat sink, the heat conduction speed is significantly improved compared to relying solely on the heat-conducting ring to dissipate heat. At the same time, the heat sink on the heat pipe further expands the heat dissipation area, effectively reducing the operating temperature of the bearing and allowing the bearing to maintain good operating conditions even under high-speed operation. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0024] Figure 2 This is a front view of the present invention;

[0025] Figure 3 for Figure 2 Sectional view at point AA;

[0026] Figure 4 This is a right view of the heat-conducting ring in this invention;

[0027] Figure 5 for Figure 4 Sectional view at point BB;

[0028] Figure 6 This is a three-dimensional structural diagram of the sealing column in this invention;

[0029] Figure 7 This is a front view of the sealing column in this invention;

[0030] Figure 8 for Figure 7 Sectional view at CC;

[0031] Figure 9 This is a three-dimensional structural diagram of the guide tube.

[0032] In the diagram: 1. Inner ring of bearing; 2. Outer ring of bearing; 3. Cage; 4. Ball bearing; 5. Circulation mechanism; 51. Heat-conducting ring; 511. Oil reservoir; 512. Semi-arc hollow structure; 513. High-temperature resistant transparent cover; 514. Arc groove; 515. Circular through hole; 516. Heat pipe; 517. Heat sink; 518. Rectangular structure; 52. Oil inlet pipe; 53. Guide pipe; 54. Oil outlet pipe; 55. Flow pipe; 56. Filter module; 561. Sealing column; 562. Filter screen; 563. Circular hole; 564. Arc groove; 565. Oil distribution plate; 567. Collection box; 568. Cross groove. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 3As shown, the present invention provides a radial thrust bearing for use when the bearing operating temperature is below 100 degrees Celsius. The technical solution is as follows: A radial thrust bearing includes an inner ring 1, an outer ring 2, a cage 3, and balls 4, and also includes a circulation mechanism 5. The inner ring 1 is fitted inside the outer ring 2, and the balls 4 are rolled and embedded between the inner ring 1 and the outer ring 2. The cage 3 is installed between the inner ring 1 and the outer ring 2, and the balls 4 are located on the cage 3. The circulation mechanism 5 is installed on both sides of the outer ring 2. The circulation mechanism 5 uses the centrifugal force generated by the rotation of the bearing to circulate the lubricating oil inside the bearing and to perform heat exchange on the bearing.

[0035] After the motor rotates and drives the bearing to rotate, the inner ring 1 of the bearing will rotate, which will cause the balls 4 between the inner ring 1 and the outer ring 2 of the bearing to start rotating. At the same time, the circulation mechanism 5 will be activated. Under the action of centrifugal force, the lubricating oil will start to stick to the inner wall of the outer ring 2 of the bearing and adhere to the balls 4 between the inner ring 1 and the outer ring 2 of the bearing, thus lubricating the bearing. At the same time, during the lubrication process, the lubricating oil can dissipate heat and cool the bearing evenly.

[0036] like Figures 1 to 5 As shown, the circulation mechanism 5 includes a heat-conducting ring 51, an oil inlet pipe 52, a guide pipe 53, an oil outlet pipe 54, a flow pipe 55, and a filter module 56. The heat-conducting ring 51 is a circular ring structure, and the circular ring structure is fixedly installed on both sides of the outer ring 2 of the bearing. An oil inlet pipe 52 is opened inside one end of the heat-conducting ring 51. A guide pipe 53 communicating with the oil inlet pipe 52 is opened inside the outer ring 2 of the bearing. A flow pipe 55 communicating with the oil outlet pipe 54 is opened inside the outer ring 2 of the bearing. Filter modules 56 are fixedly installed at both ends of the oil inlet pipe 52. The filter module 56 filters out impurities in the lubricating oil through gravity sedimentation and enters the bearing for circulation, lubrication, and cooling.

[0037] After the bearing starts to rotate, the lubricating oil begins to adhere to the inner wall of the outer ring 2 of the bearing under the action of centrifugal force, and exerts pressure on the inner wall of the outer ring 2. As the pressure of the lubricating oil on the inner wall of the outer ring 2 of the bearing gradually increases under the action of centrifugal force, the lubricating oil then enters the oil inlet pipe 52 from the fan-shaped opening of the guide pipe 53. After passing through the oil inlet pipe 52, it flows into the filter module 56, where impurities in the lubricating oil are filtered out. Subsequently, because the heat-conducting ring 51 connected to the outer ring 2 of the bearing does not participate in the rotation, the lubricating oil flows into the oil outlet pipe 54 under the influence of gravity, and finally flows back into the bearing from the opening of the flow pipe 55, realizing the circulation of the lubricating oil inside the bearing and lubricating and cooling the bearing.

[0038] like Figures 5 to 8As shown, the filtration module 56 includes a sealing column 561 and a filter screen 562. The sealing column 561 is fixedly installed on the heat-conducting ring 51, and the filter screen 562 is fixedly installed on the sealing column 561. The sealing column 561 has a cylindrical structure, and the lower end of the cylindrical structure has a circular hole 563 that communicates with the oil outlet pipe 54. The sealing column 561 seals and filters the oil and guides the oil to the circulation mechanism 5 for circulation.

[0039] When lubricating oil enters the oil inlet pipe 52 from the fan-shaped opening of the guide pipe 53, it flows into the sealing column 561 on the filter module 56 after passing through the oil inlet pipe 52. After entering the sealing column 561, the lubricating oil first contacts the oil distribution plate 565 and is diverted by the oil distribution plate 565 to the filter screens 562 on both sides. A portion of the clean lubricating oil flows into the oil outlet pipe 54 through the filter screen 562, while impurities in the lubricating oil are intercepted by the filter screen 562. This ensures that the lubricating oil remains clean and free of impurities during the circulation process of lubricating the bearing, thereby improving the lubrication efficiency and service life of the bearing.

[0040] like Figures 6 to 8 As shown, one end of the sealing column 561 has an arc-shaped groove 564, and one end of the sealing column 561 is provided with an oil-dividing plate 565 to divert the oil. The oil-dividing plate 565 is fixedly installed between the filter screens 562. A collection box 567 for collecting and filtering impurities in the oil is installed on the sealing column 561 to ensure the purity of the lubricating oil inside the circulation mechanism 5. The top edge of the collection box 567 is connected to one end of the filter screen 562. The collection box 567 is located below the oil-dividing plate 565, and there is a gap between the collection box 567 and the oil-dividing plate 565. Impurities enter the collection box 567 through the gap. A cross-shaped groove 568 is provided on the top of the sealing column 561.

[0041] When the lubricating oil flows into the filter module 56 within the bearing, it passes through the sealing column 561 on the filter module 56. After entering the sealing column 561, the lubricating oil first contacts the oil distribution plate 565 and is diverted by the oil distribution plate 565 to the filter screens 562 on both sides. The filter screens 562 will filter out clean lubricating oil, and a portion of the clean lubricating oil will flow into the oil outlet pipe 54 through the filter screens 562. Impurities in the lubricating oil are intercepted by the filter screens 562 and flow into the collection box 567 with the lubricating oil. In the collection box 567, the impurities are affected by gravity and gradually sink to the bottom and separate from the lubricating oil. The lubricating oil that has settled on the top layer overflows from the filter screens 562 after the collection box 567 is full, thus filtering out the impurities in the lubricating oil and improving the lubrication efficiency.

[0042] like Figures 1 to 4As shown, the heat-conducting ring 51 has an oil reservoir 511 for storing lubricating oil and providing circulating lubricating oil to the circulation mechanism 5. The oil reservoir 511 is a semi-arc-shaped cavity 512, with its two ends connected to the sealing column 561 and the oil outlet pipe 54, respectively. A high-temperature resistant transparent cover 513 is installed on one outer surface of the heat-conducting ring 51, and the high-temperature resistant transparent cover 513 cooperates with the oil reservoir 511.

[0043] After the lubricating oil is filtered by the filter module 56, it flows into the collection box 567. Under the influence of gravity, the impurities in the collection box 567 gradually sink to the bottom and separate from the lubricating oil. After the upper layer of lubricating oil has settled, it overflows from the collection box 567 and flows into the oil storage box 511 from the filter screen 562. The heat-conducting ring 51 connected to the outer ring 2 of the bearing does not rotate. Under the influence of gravity, the lubricating oil in the oil storage box 511 flows into the oil outlet pipe 54 and finally flows back into the bearing from the opening of the flow pipe 55, realizing the circulation of the lubricating oil inside the entire bearing.

[0044] like Figure 1 , Figure 2 and Figure 5 As shown, the heat-conducting ring 51 has symmetrical arc-shaped grooves 514 on both sides, and a circular through hole 515 at the bottom of the arc-shaped grooves 514. A heat pipe 516 is fixedly installed on the inner wall of the heat-conducting ring 51, which is close to the oil storage box 511. The heat pipe 516 has a wool core inside, which is used to exchange heat with the lubricating oil flowing inside the circulation mechanism 5.

[0045] As the motor speed gradually increases, the centrifugal force on the ball bearing 4 causes the pressure of the ball bearing 4 on the outer ring 2 of the bearing to gradually increase. Under the action of pressure, the friction between the ball bearing 4 and the outer ring 2 of the bearing gradually increases, and the temperature also gradually rises with the working time. In order to prevent the high temperature from affecting the viscosity of the lubricating oil and causing the oil film to fail, the circulating lubricating oil carries the heat generated in the bearing to the oil reservoir 511. The heat is transferred to the heat pipe 516 through the inner wall of the oil reservoir 511. The water in the capillary wall of the heat pipe 516 evaporates when heated, and the heat is quickly transferred to the entire heat pipe 516. The water vapor is pre-condensed into water droplets at the condensing end of the heat pipe 516 and flows back to the evaporating end to complete the heat exchange, so that the heat in the oil reservoir 511 is quickly carried out by the heat pipe 516.

[0046] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a heat sink 517 is installed on the heat pipe 516. The heat sink 517 has a rectangular structure 518. The rectangular structure 518 increases the contact area between the heat sink 517 and the air, so as to evenly dissipate the heat in the lubricating oil and provide cooling lubricating oil for the circulation mechanism 5.

[0047] Heat is transferred through the inner wall of the oil reservoir 511 to the heat pipe 516, and then exchanged with the outside through the heat pipe 516. The heat carried out by the heat pipe 516 is quickly conducted to each blade of the heat sink 517 through the heat sink 517, and the heat is diffused out through large-area contact with the air, thus reducing the heat in the bearing and lubricating and cooling the bearing.

[0048] like Figure 9 As shown, the opening of the guide tube 53 is a crescent-shaped structure. The guide tube 53 circulates the lubricating oil flowing inside the circulation mechanism 5 in a tangential direction through the crescent-shaped structure.

[0049] Whether the bearing rotates forward or backward, the lubricating oil can enter the oil inlet pipe 52 from the fan-shaped opening of the guide pipe 53. When it rotates to the top, it flows into the guide pipe 53 in a tangential direction. According to Bernoulli's principle, the flow rate of the lubricating oil increases after entering the guide pipe 53 from the opening, which accelerates the circulation of the lubricating oil in the bearing and improves the cooling effect on the bearing.

[0050] Overall working process: Before starting work, remove the sealing post 561 on the heat-conducting ring 51. Pour high-speed bearing lubricating oil into the installation port of the sealing post 561, filling the oil reservoir 511 to half full. Then, reinstall the sealing post 561 in its original position. Repeat this operation to lubricate the other end of the heat-conducting ring 51. After lubrication, manually rotate the inner ring 1 of the bearing to ensure that the internal lubricating oil fully contacts the balls 4 and forms an oil film between the contact surfaces. After lubrication, press the bearing into the motor spindle using the installation equipment. After adjusting to the required position, start the motor. First, rotate the motor at the lowest speed and observe whether the bearing rotation is off-center. Carefully listen to whether the bearing makes a noticeable friction sound when it rotates. If the rotation is off-center, it indicates an incorrect installation and needs to be removed and reinstalled. If a noticeable sound can be heard, continue to observe by rotating at low speed for 1 minute. If the sound continues afterward, it means that lubrication is not adequate. The bearing needs to be reopened to check the lubrication. This is to prevent excessive friction from causing the lubricating oil temperature to rise too high during subsequent operation, which would reduce the viscosity of the lubricating oil, thin the oil film, further increase friction, and ultimately exacerbate the bearing's temperature rise, leading to bearing seizure and damage to the motor. After the initial inspection, gradually increase the motor speed and observe the bearing. If the above situation no longer occurs, it can be used normally.

[0051] After starting operation, the lubricating oil inside the bearing begins to rotate under the drive of the motor. Once the lubricating oil is fully rotating, it begins to adhere tightly to the inner wall of the outer ring 2 of the bearing under centrifugal force, exerting pressure on the inner wall. As the motor speed gradually increases, the centrifugal force on the lubricating oil also gradually increases, and the pressure of the lubricating oil on the inner wall of the outer ring 2 under centrifugal force also gradually increases. Subsequently, it enters the guide tube 53 and then flows from the guide tube 53 into the oil inlet pipe 52. After passing through the oil inlet pipe 52, it flows into the sealing column 561. After entering the sealing column 561, the lubricating oil... The lubricating oil first contacts the oil separator 565 and is diverted by the oil separator 565 to the filter screens 562 on both sides. A portion of the clean lubricating oil flows through the filter screens 562 into the oil outlet pipe 54. Impurities in the lubricating oil are intercepted by the filter screens 562 and flow into the collection box 567 with the lubricating oil. In the collection box 567, the impurities are affected by gravity and gradually sink to the bottom and separate from the lubricating oil. The lubricating oil that has settled on the top layer overflows the collection box 567 and then flows from the filter screen 562 into the oil reservoir 511. Subsequently, because the heat-conducting ring 51 connected to the outer ring 2 of the bearing does not participate in the rotation, the lubricating oil in the oil reservoir 511... Under the influence of gravity, the oil flows into the oil outlet pipe 54 and finally flows back into the bearing from the opening of the flow pipe 55. The balls 4 in the bearing are also subjected to centrifugal force during rotation. As the motor speed gradually increases, the centrifugal force on the balls 4 drives the pressure of the balls 4 on the outer ring 2 of the bearing to gradually increase. Under the action of pressure, the friction between the balls 4 and the outer ring 2 of the bearing gradually increases, and the temperature also gradually rises with working time. In order to prevent the high temperature from affecting the viscosity of the lubricating oil and causing oil film failure, the circulating lubricating oil carries the heat generated in the bearing to the oil reservoir 511. The heat is then transferred through the oil reservoir... The heat is transferred from the inner wall of the oil reservoir 511 to the heat pipe 516. The water in the capillary wall of the heat pipe 516 evaporates when heated, which quickly transfers the heat to the entire heat pipe 516. The water vapor is pre-condensed into water droplets at the condensing end of the heat pipe 516 and flows back to the evaporating end to complete the heat exchange. This allows the heat in the oil reservoir 511 to be quickly carried out by the heat pipe 516. The heat carried out by the heat pipe 516 is quickly conducted to each blade of the heat sink 517 through the heat sink 517. The heat is diffused away through large-area contact with the air, and the heat in the bearing is reduced in a continuous cycle, so that the bearing can still maintain good working condition under high-speed operation.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A radial thrust bearing comprising a bearing inner ring (1), a bearing outer ring (2), a cage (3) and balls (4), characterized in that: It also includes a circulation mechanism (5), wherein the inner ring (1) of the bearing is fitted inside the outer ring (2) of the bearing, the ball (4) is rolled and embedded between the inner ring (1) and the outer ring (2) of the bearing, the cage (3) is installed between the inner ring (1) and the outer ring (2) of the bearing, and the ball (4) is located on the cage (3). The circulation mechanism (5) is installed on both sides of the outer ring (2) of the bearing. The circulation mechanism (5) uses the centrifugal force generated by the rotation of the bearing to circulate the lubricating oil inside the bearing and to perform heat exchange on the bearing. The circulation mechanism (5) includes a heat-conducting ring (51), an oil inlet pipe (52), a guide pipe (53), an oil outlet pipe (54), a flow pipe (55), and a filter module (56). The heat-conducting ring (51) is a circular ring structure, and the circular ring structure is fixedly installed on both sides of the outer ring (2) of the bearing. An oil inlet pipe (52) is opened inside one end of the heat-conducting ring (51). A guide pipe (53) communicating with the oil inlet pipe (52) is opened inside the outer ring (2) of the bearing. A flow pipe (55) communicating with the oil outlet pipe (54) is opened inside the outer ring (2) of the bearing. A filter module (56) is fixedly installed at both ends of the oil inlet pipe (52). The filter module (56) filters out impurities in the lubricating oil through gravity sedimentation and enters the bearing for circulation, lubrication, and cooling. The filter module (56) includes a sealing column (561) and a filter screen (562). The sealing column (561) is fixedly installed on the heat-conducting ring (51), and the filter screen (562) is fixedly installed on the sealing column (561). The sealing column (561) has a cylindrical structure, and the lower end of the cylindrical structure has a circular hole (563) that communicates with the oil outlet pipe (54). The sealing column (561) seals and filters the oil and guides the oil to the circulation mechanism (5) for circulation. The heat-conducting ring (51) is provided with an oil storage box (511) for storing lubricating oil and providing circulating lubricating oil to the circulation mechanism (5). The oil storage box (511) is a semi-arc cavity (512). The two ends of the semi-arc cavity (512) are connected to the sealing column (561) and the oil outlet pipe (54) respectively. A high-temperature resistant transparent cover (513) is installed on one outer surface of the heat-conducting ring (51). The high-temperature resistant transparent cover (513) cooperates with the oil storage box (511). The heat-conducting ring (51) has symmetrical arc-shaped grooves (514) on both sides, and a circular through hole (515) is provided at the bottom of the arc-shaped grooves (514). A heat pipe (516) is fixedly installed on the inner wall of the heat-conducting ring (51) close to the oil storage box (511). The heat pipe (516) has a wool core inside, which is used to exchange the heat of the lubricating oil flowing inside the circulation mechanism (5).

2. A radial thrust bearing according to claim 1, wherein: The sealing column (561) has an arc-shaped groove (564) at one end and an oil-dividing plate (565) at the other end to divide the oil. The oil-dividing plate (565) is fixedly installed between the filter screens (562). A collection box (567) for collecting and filtering impurities in the oil is installed on the sealing column (561) to ensure the purity of the lubricating oil inside the circulation mechanism (5). The top edge of the collection box (567) is connected to one end of the filter screen (562). The collection box (567) is located below the oil-dividing plate (565) and there is a gap between it and the oil-dividing plate (565). Impurities enter the collection box (567) through the gap. A cross groove (568) is provided on the top of the sealing column (561).

3. A radial thrust bearing according to claim 1, characterized in that: The heat pipe (516) is equipped with a heat sink (517), which is a rectangular structure (518). The heat sink (517) increases the contact area with the air through the rectangular structure (518), so as to evenly dissipate the heat in the lubricating oil and provide cooling lubricating oil for the circulation mechanism (5).

4. A radial thrust bearing according to claim 1, characterized in that: The guide tube (53) has a crescent-shaped opening. The guide tube (53) allows the lubricating oil flowing inside the circulation mechanism (5) to flow tangentially into the guide tube (53) and circulate.

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