Double-row angular contact ball bearing

Abstract

The invention relates to the technical field of bearings, in particular to a double-row angular contact ball bearing which comprises a bearing outer ring, a bearing inner ring, a raceway, balls and a retainer, the retainer comprises a ring body and a plurality of limiting rings, an oil coating groove is formed in the inner side wall of each limiting ring, and oil coating cotton is arranged in each oil coating groove; a plurality of oil storage grooves are further formed in the ring body, a communicating groove is formed between each oil coating groove and the corresponding oil storage groove, a plurality of oil injection openings are further formed in the end face of the ring body, and a sealing cover is arranged on each oil injection opening. By arranging the oil coating cotton, the balls are uniformly lubricated, and the grease flying phenomenon is avoided. Meanwhile, the lubricating grease is stored in the oil storage tank, the oil coating cotton extends into the oil storage tank to continuously adsorb the lubricating grease and coat the lubricating grease on the balls, the lubricating grease only needs to be supplemented into the oil storage tank from the oil injection port during supplementing, the service time of the oil coating cotton is prolonged, and meanwhile the lubricating grease supplementing convenience is improved.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, specifically to a double-row angular contact ball bearing. Background Technology

[0002] A bearing is a component used to support the rotation of a mechanical body. Its main function is to reduce the frictional force experienced by the rotating parts of the equipment. A double-row angular contact ball bearing is a type of bearing that has two rows of balls between its inner and outer rings. This converts the sliding friction between the parts into rolling friction between the balls and the inner and outer rings, thereby reducing the frictional force experienced by the parts during rotation.

[0003] Double-row angular contact ball bearings are designed essentially the same as single-row angular contact ball bearings, essentially two single-row angular contact ball bearings mounted back-to-back side-by-side, but requiring less axial space. They can withstand radial and axial loads, as well as overturning moments, and are widely used in various applications.

[0004] Double row angular contact ball bearings typically require the application of grease between the inner and outer rings during use. This grease lubricates the balls and their tracks during bearing rotation, further reducing resistance to the balls. Additionally, the grease helps dissipate heat, thus extending the lifespan of the balls and the entire bearing.

[0005] Currently, when applying grease to bearings, it's common practice to apply it directly between the inner and outer rings. While this method is convenient, the grease easily comes into contact with airborne debris such as dust and particles, leading to increased ball wear and reduced bearing life during lubrication. Although adding a sealing cap to the bearing end can address the issue of dust and debris getting into the grease, as the balls rotate along the raceway, they collide with the grease. Due to these impacts and centrifugal force, the grease is often flung outwards, resulting in grease splatter. Over time, this grease prevents contact with the balls, hindering effective lubrication. This increases friction between the balls and raceway, raising ball temperatures and impacting their lifespan. Furthermore, large amounts of grease flung into areas inaccessible to the balls are susceptible to bacterial contamination and deterioration, leading to further corrosion of the bearing.

[0006] In the prior art, Chinese invention patent application number CN201811588954.3, entitled "Open Double-Row Four-Point Angular Contact Ball Bearing," proposes a double-row angular contact ball bearing. This bearing features a rigid frame and an elastic pad. The rigid frame has grooves with their openings facing the balls. Grease reservoirs are placed within the grooves, and oil outlet holes are located on the contact surface between the elastic pads and the balls. This patent, by incorporating grease reservoirs, ensures that the grease is evenly applied to the balls upon contact, thus preventing grease splattering while guaranteeing ball lubrication.

[0007] However, in the aforementioned invention patent, because the cage and raceways occupy a large portion of the ball's surface area, the grease reservoir must be designed to have a small volume to ensure lubrication between the grease reservoir and the ball's surface. This limits the amount of grease stored in the reservoir, making it insufficient to support long-term lubrication of the balls. Furthermore, the grease reservoir located between two rows of balls is obstructed by the balls, making it difficult to manually replenish the grease in this location.

[0008] To address this issue, a double-row angular contact ball bearing is proposed, which ensures that grease does not fly off in the double-row angular contact ball bearing while solving the problem of difficult grease replenishment in the double-row angular contact ball bearing. Summary of the Invention

[0009] The purpose of this invention is to provide a double-row angular contact ball bearing that prevents grease from flying out while solving the problem of difficult grease replenishment in double-row angular contact ball bearings.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A double-row angular contact ball bearing includes an outer ring and an inner ring. The outer ring is coaxially fitted around the inner ring. Two raceways are provided between the inner and outer rings, spaced apart along the axis of the inner ring. Each raceway has the same number of balls. Two cages are also provided between the outer and inner rings, spaced apart corresponding to the two raceways. Each cage includes a ring body and multiple retaining rings, the same number as the balls on the corresponding raceways. The retaining rings are evenly distributed circumferentially on the ring body with the ring body axis as a reference. The axis of each retaining ring passes through and is perpendicular to the ring body axis. The balls and retaining rings... Each ball bearing is rotatably mounted within a limiting ring, and each limiting ring has an oiling groove on its inner sidewall. Each oiling groove contains an oiling cotton. Each ring body has multiple oil reservoirs for storing grease, corresponding to the multiple oiling grooves. The oiling grooves are located between the ball bearings and the oil reservoirs. Each oiling groove and its corresponding oil reservoir have a connecting groove. One end of each oiling cotton abuts against the ball bearing, and the other end extends into the corresponding oil reservoir through the connecting groove. The end face of the ring body also has multiple oil inlets for injecting grease into the oil reservoirs. Each oil inlet corresponds to one oil reservoir, and each oil inlet is equipped with a sealing cap.

[0012] One end of the grease-applying cotton abuts against the ball bearing inside the limiting ring, while the other end extends into the oil reservoir. Through capillary action, the grease in the reservoir is delivered to the ball bearing surface, providing uniform lubrication. Since the grease is applied via the cotton, and the cotton scrapes the grease off the ball bearing surface as the ball rotates, it ensures even grease distribution and effectively prevents excessive grease application that could cause grease splatter during ball rotation, thus improving grease utilization. Simultaneously, the oil reservoir provides a continuous supply of grease, significantly extending the effective lubrication time and ensuring the lifespan of the ball bearing and bearing. Furthermore, the grease inlet allows for easy replenishment of the grease in the reservoir without directly applying grease to the cotton, preventing situations where grease cannot be replenished and greatly improving the convenience of grease replenishment.

[0013] Preferably, the oil inlets on the retainers are all located at opposite ends of the two retainers. Multiple connecting ports are provided on the opposite ends of the two retainers. The multiple connecting ports on the same retainer correspond one-to-one with and are connected to multiple oil reservoirs. The connecting ports on the two retainers are aligned one-to-one, and a flow pipe is provided between the two aligned connecting ports on the two retainers. The flow pipe is used to connect and connect the aligned connecting ports on the two retainers.

[0014] During bearing use, due to the influence of equipment parts, most bearings are only visible to workers at one end, while the other end may be obscured by equipment components. Consequently, it is difficult to replenish the oil reservoir inside the cage at the obscured end with grease. By installing a connecting port and flow pipe, grease only needs to be replenished to the oil reservoir on one cage, and the grease can be transferred to the oil reservoir on the other cage through the connecting port and flow pipe. This further improves the convenience of bearing grease replenishment while ensuring that grease does not fly away.

[0015] Preferably, the ring body also has an oil replenishment groove inside. One end of the oil replenishment groove is connected to the limiting ring for replenishing oil to the balls, and the other end is connected to the top of the oil reservoir. When the bearing rotates at high speed, the grease inside the oil reservoir is also subjected to centrifugal force and moves towards the top of the oil reservoir under the action of centrifugal force. Using centrifugal force, the grease can enter the oil replenishment groove when the bearing rotates at high speed and directly contact the balls from the oil replenishment groove, effectively improving the lubrication and heat dissipation effect of the balls when rotating at high speed. Since the grease has a certain viscosity, the balls will also block the opening of the oil replenishment groove, so the grease will not flow out of the oil replenishment groove in large quantities, and grease splatter will not occur.

[0016] Preferably, a push plate is slidably installed inside the oil reservoir, and a spring is also provided inside the oil reservoir. The spring is used to keep the push plate pushed towards the axis of the ring. Utilizing the centrifugal force experienced by the push plate during rotation, the grease is squeezed and pushed towards the oil replenishment groove when the bearing rotates at high speed, further ensuring the lubrication effect of the balls when the bearing rotates at high speed. The spring is used so that when the bearing changes from high speed to low speed, when the centrifugal force experienced by the push plate is less than the spring force, the spring drives the push plate to reset. When the push plate resets, the viscosity of the grease can be used to draw the grease in the oil replenishment groove back into the oil reservoir, preventing the grease from flowing out of the oil replenishment groove at low speed. The spring also increases the adhesion area of ​​the grease, and the viscosity of the grease further prevents the grease from flowing out of the oil reservoir at low speed, avoiding grease waste and improving the effective utilization rate of the grease, so as to ensure the continuous and effective lubrication of the balls by the grease pad.

[0017] Preferably, a rotating plate is installed inside the oiling groove, and the oiling cotton is fixedly installed on the lower side of the rotating plate. During the high-speed rotation of the bearing, the rotating plate can use centrifugal force to deflect the oiling cotton. Since the length of the oiling cotton is fixed, this deflection allows the oiling cotton to disengage from the ball bearing, preventing the oiling cotton from increasing the friction on the ball bearing during high-speed rotation, reducing ball bearing heat generation, and preventing rapid wear of the oiling cotton. This also prevents the oiling cotton from becoming worn and unable to stably apply oil to the ball bearing, further ensuring the stability of the bearing's use. When the rotating plate rotates, it can also pull and retract the oiling cotton extending into the oil reservoir into the connecting groove, preventing the oiling cotton extending into the oil reservoir from affecting the movement of the push plate and from interfering with the entry of lubricating grease into the oil replenishment groove.

[0018] Preferably, two counterweights are fixedly installed at the end of the rotating plate away from the balls. Both counterweights are located at the bottom of the rotating plate and are spaced apart on both sides. A limit block is provided on the side of the oiling groove closest to the balls, located on the upper side of the rotating plate. The counterweights are used to increase the centrifugal force on one side of the rotating plate, preventing it from swinging back and forth during rotation, and further ensuring that the oiling cotton does not affect the rotation of the balls when the bearing rotates at high speed. Furthermore, the counterweights and limit blocks help to...

[0019] Preferably, an oil return groove is provided on the side of the oiling groove away from the ball bearing. The oil return groove is funnel-shaped, with the smaller end of the funnel-shaped oil return groove facing the direction of the oil storage groove, and the oil return groove connects the oiling groove and the oil storage groove.

[0020] When the bearing returns to low speed from high speed, the grease pad can be used to scrape off excess grease applied to the balls during high-speed rotation. This excess grease accumulates in the grease groove, and as the accumulation increases, it is eventually recovered from the return groove to the reservoir for storage, improving grease utilization and preventing waste. The funnel-shaped return groove facilitates the return of grease into the reservoir while effectively preventing grease from overflowing into the grease groove, thus avoiding waste.

[0021] Preferably, the push plate is provided with a plurality of oil drain holes, which are evenly distributed on the push plate and penetrate the top and bottom surfaces of the push plate.

[0022] To prevent grease from accumulating at the bottom of the push plate and affecting its reset, the bearing's stability during use is further improved.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. The double-row angular contact ball bearing designed in this invention uses an oiling cotton pad to uniformly lubricate the balls, avoiding excessive grease application that could cause grease splatter. Simultaneously, the grease is stored inside an oil reservoir, and the oiling cotton pad continuously absorbs and applies the grease to the balls, significantly extending the effective lubrication time of the oiling cotton pad. Furthermore, grease replenishment only requires adding it to the oil reservoir through the grease filler port, eliminating the need to directly apply it to the oiling cotton pad, thus improving the convenience of grease replenishment.

[0025] 2. The double-row angular contact ball bearing designed in this invention is also provided with an oil replenishment groove. By utilizing the centrifugal force when the bearing rotates, the grease can directly contact the balls through the oil replenishment groove when the bearing rotates at high speed, which ensures the lubrication effect when the bearing rotates at high speed. This avoids the situation where the oil-coated cotton alone cannot fully lubricate the balls when the bearing rotates at high speed, thus ensuring the lubrication effect when the bearing rotates at high speed and thus ensuring the service life of the bearing.

[0026] 3. The double-row angular contact ball bearing designed in this invention is further provided with a rotating plate and a counterweight. By utilizing the centrifugal force on the rotating plate and the counterweight when the bearing rotates, the oiling cotton can be separated from the balls when the bearing rotates at high speed, so as to avoid the oiling cotton affecting the high-speed rotation of the balls and also to avoid the oiling cotton from rapid wear when the balls rotate at high speed, thereby improving the service life of the oiling cotton and further improving the stability of the bearing. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a front view of the present invention;

[0029] Figure 3 For the present invention Figure 2 Sectional view at point AA;

[0030] Figure 4 This is a three-dimensional structural diagram of the cage in this invention;

[0031] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0032] Figure 6 This is a front view of the cage in this invention;

[0033] Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle;

[0034] Figure 8 For the present invention Figure 7 Enlarged view at point D;

[0035] Figure 9 This is a rear view of the cage in this invention;

[0036] Figure 10 This is a schematic diagram showing the state where the oiled cotton and the ball bearings are out of contact when the bearing rotates at high speed in this invention.

[0037] In the diagram: 1. Bearing outer ring; 2. Bearing inner ring; 3. Raceway; 4. Ball; 5. Cage; 501. Ring body; 502. Limiting ring; 6. Oil groove; 7. Oiling cotton; 8. Oil reservoir; 9. Connecting groove; 10. Oil inlet; 11. Sealing cap; 12. Connecting port; 13. Flow pipe; 14. Oil replenishment groove; 15. Push plate; 16. Spring; 17. Rotating plate; 18. Counterweight; 19. Oil return groove; 1901. Large end; 1902. Small end; 20. Oil drain hole; 21. Bolt; 22. Limiting block. Detailed Implementation

[0038] Please see Figures 1 to 10 This invention provides a double-row angular contact ball bearing, the technical solution of which is as follows:

[0039] A double-row angular contact ball bearing, reference Figures 1 to 3 The bearing includes an outer ring 1 and an inner ring 2. The outer ring 1 is coaxially sleeved on the outer ring 2. Two raceways 3 are provided between the inner ring 2 and the outer ring 1. The two raceways 3 are spaced apart along the axial direction of the inner ring 2. Each raceway 3 is provided with eight balls 4. Two cages 5 are also provided between the outer ring 1 and the inner ring 2, corresponding to the two raceways 3.

[0040] refer to Figure 1 as well as Figures 4 to 9The cage 5 includes a ring body 501 and eight limiting rings 502, the same number as the balls 4 on the corresponding raceways 3. The eight limiting rings 502 are evenly distributed on the ring body 501 with the axis of the ring body 501 as the reference. The axis of each limiting ring 502 passes through the axis of the ring body 501 and is perpendicular to the axis of the ring body 501. The balls 4 correspond one-to-one with the limiting rings 502, and each ball 4 is rotatably installed in the limiting ring 502. Each limiting ring 502 has an oiling groove 6 on its inner sidewall. A rotating plate 17 is installed inside the oiling groove 6. Two counterweights 18 are fixedly installed at the end of the rotating plate 17 away from the balls 4. The two counterweights 18 are located at the bottom of the rotating plate 17 and are spaced apart on both sides of the rotating plate 17. A limiting block 22 is provided on the side of the oiling groove 6 near the balls 4. The limiting block 22 is located on the upper side of the rotating plate 17. Each rotating plate 17 has an oiling cotton 7 fixedly installed below it. Each ring 501 has eight corresponding oiling grooves 6 with eight oil reservoirs 8 for storing grease. The oiling grooves 6 are all located between the balls 4 and the oil reservoirs 8. A connecting groove 9 is provided between each oiling groove 6 and its corresponding oil reservoir 8. One end of each oiling cotton 7 abuts against the balls 4, and the other end extends into the corresponding oil reservoir 8 through the connecting groove 9. An oil return groove 19 is provided on the side of the oiling groove 6 away from the balls 4. The oil return groove 19 is funnel-shaped, with its larger end 1901 facing the oiling groove 6 and communicating with its lower side, and its smaller end 1902 facing the oil reservoir 8 and communicating with its lower side.

[0041] refer to Figures 4 to 8 The ring body 501 also has eight oil replenishment grooves 14 inside, which correspond one-to-one with eight oil storage grooves 8. One end of the oil replenishment groove 14 is connected to the limiting ring 502 for replenishing oil to the ball bearings 4, and the other end is connected to the top of the oil storage groove 8. Each oil storage groove 8 has a push plate 15 slidably installed inside, and a spring 16 is also installed inside the oil storage groove 8. The spring 16 is used to keep the push plate 15 pushed towards the axis of the ring body 501. The push plate 15 has nine oil drain holes 20, which are evenly distributed on the push plate 15 and all penetrate the top and bottom surfaces of the push plate 15.

[0042] Among them, reference Figure 1 and Figure 4 The retainer 5 is a central plane along the axial direction of the ring 501 that divides the ring 501 and the limiting ring 502 into two parts, and then uses bolts 21 to connect and assemble the entire retainer 5 into a detachable form.

[0043] In addition, refer to Figure 1 , Figure 4 , Figure 6 and Figure 9The ring body 501 has eight grease inlets 10 on one end face for injecting grease into the oil reservoirs 8. Each of the eight grease inlets 10 corresponds to one of the eight oil reservoirs 8, and each grease inlet 10 is equipped with a sealing cap 11. On the other end of the ring body 501 opposite to the grease inlets 10, there are eight connecting ports 12 corresponding to the eight oil reservoirs 8. Each connecting port 12 is connected to the corresponding oil reservoir 8. In addition, each pair of retainers 5 is equipped with eight flow tubes 13.

[0044] refer to Figures 1 to 5 During bearing assembly, the outer ring 1 and inner ring 2 of the bearing are placed horizontally on a table, with the outer ring 1 fitted over the inner ring 2. Then, half of a retainer 5 with an oil inlet 10 is placed coaxially between the inner ring 2 and the outer ring 1, with the oil inlet 10 of this half retainer 5 facing downwards towards the table. Next, eight balls 4 are rotated into the raceway 3 near the table, ensuring that all eight balls 4 fall into the half-restriction ring 502 on the half retainer 5. Then, the shaft on the rotating plate 17, to which the oiling cotton 7 is fixed, is inserted into the shaft hole in each oiling groove 6, with the end of the oiling cotton 7 away from the balls 4 extending along the connecting groove 9 into the oil reservoir 8. Afterward, the push plate 15 is slidably inserted into each oil reservoir 8, and a spring 16 is installed inside the oil reservoir 8, causing the spring 16 to push the push plate 15 towards the axis of the ring body 501. Next, the retainer 5 with the connecting port 12 facing upwards is placed between the outer ring 1 and the inner ring 2 of the bearing, so that the limiting ring 502 on this half of the retainer 5 with the connecting port 12 is aligned with the half of the retainer 5 installed below. After the two halves of the limiting ring 502 are combined into a complete limiting ring 502, the eight limiting rings 502 restrict the eight balls 4 one by one within the limiting ring 502. Then, the two halves of the retainer 5 are fixedly connected with bolts 21.

[0045] Subsequently, reference Figure 1 Connect the eight flow tubes 13 to the eight connecting ports 12 and insert them into the retainer 5 that has been installed below.

[0046] Afterwards, refer to Figures 1 to 5Place the half of another retainer 5 with the flow port facing down between the outer ring 1 and the inner ring 2 of the bearing. Next, adjust the inserted half of the retainer 5 so that the eight connecting ports 12 on this half of the retainer 5 are aligned with the eight flow tubes 13 below. Then, press the half of the retainer 5 downwards so that the flow tubes 13 are inserted into the flow ports of this half of the retainer 5. Then, following the same installation method as the first retainer 5, install the rotating plate 17 and the oiling cotton 7 into each oiling groove 6, and install the push plate 15 and the spring 16 into each oil reservoir 8. After installation, install the eight balls 4 into the raceways 3 away from the tabletop, so that the eight balls 4 fall into the eight half-restriction rings 502 that were just installed. Next, the other half of the retainer 5, with the oil inlet 10 facing upwards, is placed between the inner ring 2 and the outer ring 1 of the bearing. After aligning it with the lower half of the retainer 5, it is tightened with bolts 21, so that the two half-limiting rings 502 on the two half-retainers 5 form a complete ring, keeping the balls 4 within the limiting rings 502. In this way, the entire bearing is installed. Afterwards, simply inject grease into each oil reservoir 8 from both ends of the bearing through the oil inlet 10, and then seal each oil inlet 10 with the sealing cap 11.

[0047] During the use of bearings, refer to Figure 1 The outer ring 1 and the inner ring 2 of the bearing rotate relative to each other, while the balls 4 also rotate around the axis of the bearing along the raceway 3 inside the corresponding raceway 3.

[0048] refer to Figure 1 , Figure 4 , Figure 5 , Figure 8 At low rotation speeds, the heat generated by the rotation of ball 4 is relatively small, and the requirements for lubrication and heat dissipation of ball 4 are also relatively low. At this time, the centrifugal force on the rotating plate 17 is relatively small. When ball 4 rotates to the highest position of raceway 3, under the pull of the weight block 18, the end of the rotating plate 17 near ball 4 abuts against the limiting ring 502, and the end of the oiling cotton 7 near ball 4 abuts against ball 4, while the other end away from ball 4 extends into the oil reservoir 8. Under the action of capillary effect, the oiling cotton 7 absorbs the grease inside the oil reservoir 8 and spreads the grease along the oiling cotton 7 onto ball 4, providing uniform lubrication to ball 4 and effectively preventing grease splatter. With the oil reservoir 8 as a backup lubrication supply, the effective lubrication time of the oiling cotton 7 for ball 4 is greatly improved.

[0049] Furthermore, refer to Figure 1If the grease inside the oil reservoir 8 is depleted, grease can be replenished into each oil reservoir 8 through the grease inlet 10 from one end of the bearing. Furthermore, thanks to the connection provided by the flow pipe 13, grease replenishment only needs to be done on one of the retainers 5 to transfer grease to the oil reservoir 8 on the other retainer 5. This greatly avoids situations where grease replenishment on the other retainer 5 is impossible due to obstruction by equipment parts, ensuring the ease of use and lubrication stability of the bearing.

[0050] When the bearing rotates at high speed, refer to Figure 10 The counterweight 18 on the rotating plate 17 moves away from the bearing axis under the action of centrifugal force, while the end of the rotating plate 17 facing the ball 4 swings towards the bearing axis. The end of the grease 7 facing the ball 4 disengages from the ball 4, preventing the grease 7 from affecting the rotation of the ball 4 when it rotates at high speed. The end of the grease 7 that extends into the oil reservoir 8 is pulled out of the oil reservoir 8 and drawn into the connecting groove 9. The grease inside the oil reservoir 8 is also thrown towards the top of the oil reservoir 8 under the action of centrifugal force, and the pusher plate 15 further pushes the grease in the oil reservoir 8 towards the top of the oil reservoir 8 under the action of centrifugal force. After the grease reaches the top of the oil reservoir 8, it enters the oil replenishment groove 14 under the action of centrifugal force and the squeezing action of the pusher plate 15, and flows along the oil replenishment groove 14 to the ball 4 to directly lubricate the ball 4. This is also to prevent the oiled cotton 7 from failing to quickly absorb the grease inside the oil reservoir 8 and transfer it to the ball 4 when the ball 4 rotates at high speed, so as to ensure the lubrication and cooling effect of the ball 4 when it moves at high speed and thus guarantee the service life of the bearing.

[0051] When the bearing returns to a low-speed rotation state from a high-speed rotation state, refer to Figure 7 and Figure 8 Under the pull of the counterweight 18, the end of the oiled cotton 7 facing the ball 4 resets and resumes contact with the ball 4, while the end of the oiled cotton 7 away from the ball 4 also extends back into the oil reservoir 8 along the connecting groove 9 under the pull of the counterweight 18. The push plate 15 inside the oil reservoir 8 is pushed back to the bottom of the oil reservoir 8 under the elastic force of the spring 16. When the push plate 15 resets, if there is grease at the bottom of the push plate 15, the grease will be squeezed by the push plate 15 and reach the top of the push plate 15 through the oil drain hole 20, without affecting the reset of the push plate 15.

[0052] After the oiled cotton 7 re-engages with the ball bearing 4, refer to Figure 7 and Figure 8As the ball bearing 4 rotates, the grease pad 7 scrapes off excess grease from the ball bearing 4 and collects it below the grease pad 7. As the grease continues to accumulate below the grease pad 7, it is gradually squeezed into the grease groove 6 under the rotation of the ball bearing 4, and finally enters the return oil groove 19 from the large opening 1901, and then re-enters the oil reservoir 8 from the small opening 1902 for storage. This process recovers excess grease after high-speed rotation, further reducing grease splatter and waste. Grease recovery helps extend the lubrication time of the ball bearing 4, thereby improving the bearing's service life.

[0053] refer to Figure 8 When the grease is returned to the oil storage tank 8 through the oiling tank 6, the grease can replenish the grease in the oiling cotton 7 again, ensuring that there is sufficient grease in the oiling cotton 7 to ensure the lubrication effect of the oiling cotton 7 on the ball 4 and to ensure the service life of the bearing.

[0054] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A double-row angular contact ball bearing, comprising an outer ring (1) and an inner ring (2), wherein the outer ring (1) is coaxially sleeved on the outer ring (2), and two raceways (3) are provided between the inner ring (2) and the outer ring (1), each raceway (3) being provided with a plurality of balls (4) of the same number, and two cages (5) are also provided between the outer ring (1) and the inner ring (2) at intervals corresponding to the two raceways (3), characterized in that, The retainer (5) includes a ring body (501) and a plurality of limiting rings (502) with the same number of balls (4) as the corresponding raceways (3). The balls (4) correspond one-to-one with the limiting rings (502), and each ball (4) is rotatably mounted in the limiting ring (502). Each limiting ring (502) has an oiling groove (6) on its inner sidewall, and each oiling groove (6) is provided with an oiling cotton (7). Each ring body (501) has a plurality of oiling grooves (6) corresponding to the plurality of oiling grooves (6) for storing grease. The oil reservoir (8) is located between the ball (4) and the oil reservoir (8). Each oil reservoir (6) is connected to the corresponding oil reservoir (8) by a connecting groove (9). One end of each oiling cotton (7) is abutted against the ball (4), and the other end extends into the corresponding oil reservoir (8) through the connecting groove (9). The end face of the ring (501) is also provided with a plurality of oil injection ports (10) for injecting grease into the oil reservoir (8). Each oil injection port (10) is provided with a sealing cap (11).

2. A double-row angular contact ball bearing according to claim 1, characterized in that, The oil inlets (10) on the retainers (5) are all located at opposite ends of the two retainers (5). Multiple connecting ports (12) are provided on the opposite ends of the two retainers (5). The multiple connecting ports (12) on the same retainer (5) correspond one-to-one with and are connected to multiple oil reservoirs (8). The connecting ports (12) on the two retainers (5) are aligned one-to-one, and a flow pipe (13) is provided between the two aligned connecting ports (12) on the two retainers (5). The flow pipe (13) is used to connect and connect the aligned connecting ports (12) on the two retainers (5).

3. A double-row angular contact ball bearing according to claim 1, characterized in that, The ring (501) is also provided with multiple oil replenishing grooves (14), which correspond one-to-one with multiple oil storage grooves (8). One end of the oil replenishing groove (14) is connected to the limiting ring (502) for replenishing oil to the ball (4), and the other end is connected to the top of the oil storage groove (8).

4. A double-row angular contact ball bearing according to claim 3, characterized in that, Each of the oil storage tanks (8) is slidably fitted with a push plate (15), and a spring (16) is also provided inside the oil storage tank (8). The spring (16) is used to keep the push plate (15) pushed towards the axis of the ring body (501).

5. A double-row angular contact ball bearing according to claim 4, characterized in that, The oiling tank (6) is equipped with a rotating plate (17), and the oiling cotton (7) is fixedly installed on the lower side of the rotating plate (17). The rotating plate (17) is used to drive the oiling cotton (7) to deflect up and down and to disengage from the ball (4).

6. A double-row angular contact ball bearing according to claim 5, characterized in that, Two counterweights (18) are fixedly installed at the end of the rotating plate (17) away from the ball (4). Both counterweights (18) are located at the bottom of the rotating plate (17) and are spaced apart on both sides of the rotating plate (17). A limit block (22) is provided on the side of the oiling groove (6) near the ball (4). The limit block (22) is located on the upper side of the rotating plate (17).

7. A double-row angular contact ball bearing according to claim 5, characterized in that, The oiling groove (6) is provided with an oil return groove (19) on the side away from the ball (4). The oil return groove (19) is in the shape of a trumpet. The large end (1901) of the trumpet-shaped oil return groove (19) faces the oiling groove (6) and is connected to the lower side of the oiling groove (6). The small end (1902) of the trumpet-shaped oil return groove (19) faces the direction of the oil storage groove (8) and is connected to the lower side of the oil storage groove (8).

8. A double-row angular contact ball bearing according to claim 4, characterized in that, The push plate (15) is provided with a plurality of oil drain holes (20), which are evenly distributed on the push plate (15) and all the oil drain holes (20) penetrate the top and bottom surfaces of the push plate (15).

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