A motor end cover bearing grease lubrication cooling system

Abstract

The application discloses a motor end cover bearing grease lubrication cooling system, which comprises a motor shaft and a motor end cover. The motor end cover is rotationally connected with the motor shaft through a bearing. The motor end cover is provided with an outer oil seal disc and an inner oil seal disc at two ends respectively. The inner side of the outer oil seal disc in the encapsulated state forms an annular chamber, and the side of the inner oil seal disc close to the bearing forms an annular chamber. A snap spring is arranged on the snap spring groove of the motor shaft in the annular chamber. The motor shaft is provided with a sleeve ring, and the sleeve ring is clamped between the snap spring and the inner ring of the bearing. The inner ring of the motor end cover is provided with a grease restraining ring, and the outer ring of the grease restraining ring is clamped between the outer oil seal disc and the outer ring of the bearing. The annular grease overflow gap is formed between the inner ring of the grease restraining ring and the sleeve ring. The annular centrifugal grease restraining ring groove is arranged on the side of the grease restraining ring close to the bearing. The lubrication and heat dissipation can be obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of motor end cover lubrication. Background Technology

[0002] Existing motor end cover bearing grease lubrication and cooling systems, such as Figure 1 As shown, the oil slinger next to the end cover bearing is machined from a steel plate or stamped from an iron sheet. They share a common operating mechanism: rotating with the shaft. After the grease exits the bearing, the slinger's action provides some cooling. The oil slinger also acts as a baffle, preventing rapid grease loss. However, due to centrifugal force, it cannot completely prevent this loss. Figure 1 The trajectory of the grease is shown in the diagram. From the trajectory of the grease, it can be seen that the oil slinger can promote oil leakage. It acts as a baffle to prevent the rapid loss of grease, but it is a high-speed rotating component. The centrifugal force generated at high speed causes the grease to accumulate rapidly in the gaps around the oil slinger, which in turn accelerates the loss of grease.

[0003] Furthermore, during motor operation: when the motor shaft speed exceeds 2000 revolutions per minute, the balls in the bearing ball ring cavity between the outer and inner rings of the bearing will generate heat due to increased friction. If the heat accumulates, it will seriously affect the bearing life. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a grease lubrication and cooling system for motor end cover bearings, which can significantly improve lubrication and heat dissipation.

[0005] Technical solution: To achieve the above objectives, the present invention provides a motor end cover bearing grease lubrication and cooling system, comprising a motor shaft and a motor end cover; the motor end cover is rotatably coupled to the motor shaft via a bearing, and an outer oil seal and an inner oil seal are respectively encapsulated at both ends of the motor end cover. In the encapsulated state, an annular compartment is formed on the inner side of the outer oil seal and an annular compartment is formed on the side of the inner oil seal near the bearing.

[0006] There is a retaining ring in the retaining ring groove of the motor shaft in the ring chamber, and a collar is wrapped around the motor shaft. The collar is sandwiched between the retaining ring and the inner ring of the bearing.

[0007] The inner ring of the motor end cover is fitted with a grease restraint ring, and the outer ring of the grease restraint ring is sandwiched between the outer oil seal plate and the outer ring of the bearing; an annular grease overflow gap is formed between the inner ring of the grease restraint ring and the outer ring; an annular centrifugal grease restraint ring groove is provided on the side of the grease restraint ring near the bearing.

[0008] The bearing ball ring cavity between the outer ring and the inner ring is coaxially connected to the annular centrifugal grease constraint groove; the end of the annular grease overflow gap near the bearing is connected to the annular centrifugal grease constraint groove and the bearing ball ring cavity, and the end away from the bearing is connected to the ring chamber.

[0009] Furthermore, the upper end of the outer oil seal has an upward-facing oil inlet; the encapsulation structure formed by the combination of the motor end cover and the outer oil seal has a transverse oil guiding channel, one end of which is vertically connected to the bottom of the oil inlet, and the other end of which is connected to the annular compartment.

[0010] Furthermore, the lower end of the outer oil seal plate is provided with a downward-facing oil drain port, and a plug cap is provided outside the oil drain port. When the plug cap is removed, the lower end of the annular compartment is connected to the outside through the oil drain port.

[0011] Furthermore, the annular grease overflow gap is closer to the motor shaft axis than the annular centrifugal grease confinement ring groove. When the motor is running, the lubricating oil in the bearing ball ring cavity between the outer and inner rings of the bearing will only overflow into the annular centrifugal grease confinement ring groove in a divergent manner under the action of centrifugal force, and will not escape into the ring chamber through the annular grease overflow gap. The grease confinement ring does not rotate with the shaft, and the lubricating oil overflowing into the annular centrifugal grease confinement ring groove is not subject to centrifugal force. As a result, under the action of gravity, the lubricating oil gradually accumulates at the bottom of the annular centrifugal grease confinement ring groove. When the liquid level at the bottom of the annular centrifugal grease confinement ring groove exceeds the lower end of the bearing ball ring cavity, it will overflow back into the bearing ball ring cavity for lubrication.

[0012] Furthermore, it also includes a vertical heat-conducting oil injection pipe, the lower end of which is coaxially inserted into the oil injection port; the upper end of which is detachably equipped with an oil injection end cap; and the interior of which is a gravity-driven oil injection heat exchange channel along its length.

[0013] Furthermore, a gas circulation port is provided on the outer side of the upper end of the motor end cover; the upper part of the motor end cover is provided with a circulation channel that extends longitudinally, the lower end of the circulation channel is vertically connected to the oil guide channel, and the upper end of the circulation channel is connected to the gas circulation port.

[0014] The upper end of the heat-conducting oil injection pipe is vertically connected to a branch pipe near the motor end cover, and the end of the branch pipe is connected to the gas circulation port; centrifugal blades are arranged in a circular array around the axis of the motor shaft in the annular chamber, and the root of each centrifugal blade is integrally connected to the collar. When the motor runs, the centrifugal blades rotate synchronously with the collar, so that centrifugal wind pressure is formed in the edge area of ​​the annular chamber away from the center, and centrifugal negative pressure is formed in the edge area of ​​the annular chamber close to the center.

[0015] The outer oil seal plate is equipped with a vertical air-driven channel, which is coaxial with the gravity oil injection heat exchange channel. The lower end of the air-driven channel is connected to the upper end of the annular compartment, and the upper end is vertically connected to the lower side of one end of the oil guide channel. A vertically connected air-driven slide is coaxially and movably installed inside the air-driven channel, with a clearance fit between the outer wall of the air-driven slide and the inner wall of the air-driven channel. A conical air outlet is integrally and coaxially installed at the upper end of the air-driven slide, with the outer diameter of the thicker end of the conical air outlet being larger than the inner diameter of the air-driven channel. The upper edge of the hole in the air-driven channel supports the lower edge of the conical air outlet. The interior of the integral structure formed by the air-driven slide and the conical air outlet is a vertically connected one-way air guide channel, and a one-way valve with the guiding direction facing upward is installed inside the one-way air guide channel.

[0016] Furthermore, when the speed of the motor shaft exceeds revolutions per minute, the centrifugal blades create centrifugal wind pressure in the edge area of ​​the annular chamber away from the center. This wind pressure pushes the integrated structure formed by the wind-driven slide and the conical air outlet in the wind-driven channel upward, causing the conical air outlet to rise to the lower end of the coaxially connected gravity oil injection heat exchange channel. At the same time, the one-way valve opens under the upward air pressure.

[0017] When the conical air outlet rises to the lower end of the coaxially connected gravity oil injection heat exchange channel, the lower end of the pneumatic slide is still in the pneumatic channel.

[0018] Furthermore, the heat-conducting oil injection pipe is made of heat-conducting metal, and several heat dissipation fins are integrally arrayed along the length of the outer wall of the heat-conducting oil injection pipe; the integrated structure formed by the wind-driven slide and the conical air outlet is made of polyvinylidene fluoride, and the one-way valve is a duckbill valve.

[0019] Beneficial effects: During motor operation, the lubricating oil in the bearing ball ring cavity will only overflow into the annular centrifugal grease constraint ring groove under the action of centrifugal force, and will not escape into the ring chamber through the annular grease overflow gap. At the same time, since the grease constraint ring does not rotate with the shaft, the lubricating oil overflowing into the annular centrifugal grease constraint ring groove is not affected by centrifugal force, and thus gradually accumulates at the bottom of the annular centrifugal grease constraint ring groove under the action of gravity. When the liquid level at the bottom of the annular centrifugal grease constraint ring groove exceeds the lower end of the bearing ball ring cavity, it will overflow back into the bearing ball ring cavity for lubrication. The lubricating oil entering the bearing ball ring cavity overflows into the annular centrifugal grease constraint ring groove under the action of centrifugal force. This cycle repeats, effectively preventing the problem of lubricating oil escaping into the ring chamber through the annular grease overflow gap, and realizing the circulating lubrication process of the bearing ball ring cavity. It effectively avoids the problem of lubricating oil escape caused by the centrifugal oil throwing process of traditional oil throwing rings.

[0020] During the closed-loop gas circulation of the motor, the heat in the bearing ball ring cavity between the outer and inner rings of the bearing is continuously discharged by the gas passing laterally. As the hot gas in the above gas circulation continuously flows through the gravity oil injection heat exchange channel, it is absorbed by the heat-conducting oil injection pipe and the heat dissipation fins on the outer wall, thereby achieving efficient circulation heat dissipation of the bearing ball ring cavity between the outer and inner rings of the bearing. This reduces the degree of heat accumulation inside the high-speed bearing, and ultimately extends the bearing's service life and reduces friction loss. Attached Figure Description

[0021] Figure 1 For the existing end cap bearing lubrication structure;

[0022] Figure 2 This is a schematic diagram of the "first embodiment" of the solution;

[0023] Figure 3 This is an exploded disassembly diagram of the axis under the "Second Embodiment" of this solution;

[0024] Figure 4 This is an overall schematic diagram under the "Second Embodiment" of this solution;

[0025] Figure 5 This is an overall sectional view of the "Second Embodiment" of this solution;

[0026] Figure 6 for Figure 5 Enlarged schematic diagram of the two states at mark 33;

[0027] Figure 7 for Figure 5 Enlarged schematic diagram of the two states at mark 26;

[0028] Figure 8 for Figure 5 An enlarged view of mark 27;

[0029] Figure 9 It is an integrated structure consisting of a pneumatic slide, a conical air outlet, and a one-way valve. Detailed Implementation

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] As attached Figure 2 The first embodiment of a motor end cover bearing grease lubrication and cooling system is shown below:

[0032] Includes motor shaft 11 and motor end cover 7; such as Figure 2As shown, the inner ring of the motor end cover 7 is coaxially rotated with the motor shaft 11 via the bearing 9. The two ends of the motor end cover 7 are respectively coaxially encapsulated with an outer oil seal 4 and an inner oil seal 10 via flange bolts. In the encapsulated state, the inner side of the outer oil seal 4 forms an a ring chamber 16, and the side of the inner oil seal 10 near the bearing 9 forms a b ring chamber 28. The a sealing lip 29 of the inner ring of the outer oil seal 4 and the b sealing lip 30 of the inner ring of the inner oil seal 10 are both sealed and rotated with the outer ring of the motor shaft 11.

[0033] A retaining ring 8 is fitted onto the motor shaft 11 via a retaining ring groove. The retaining ring 8 is located in the a-ring chamber 16. A collar 5 is coaxially fitted onto the motor shaft 11. The collar 5 is sandwiched between the retaining ring 8 and the inner ring 9b of the bearing 9.

[0034] A grease constraint ring 1 is coaxially fitted inside the inner ring of the motor end cover 7. The outer ring of the grease constraint ring 1 is tightly coaxially sandwiched between the outer oil seal plate 4 and the outer ring 9a of the bearing 9. An annular grease overflow gap 17 is formed between the inner ring of the grease constraint ring 1 and the collar 5. An annular centrifugal grease constraint ring groove 3 is provided on the side of the grease constraint ring 1 near the bearing 9. The bearing ball ring cavity between the outer ring 9a and the inner ring 9b of the bearing is coaxially connected to the annular centrifugal grease constraint ring groove 3. The end of the annular grease overflow gap 17 near the bearing 9 is connected to the annular centrifugal grease constraint ring groove 3 and the bearing ball ring cavity. The end of the annular grease overflow gap 17 away from the bearing 9 is connected to the a-ring chamber 16.

[0035] The upper end of the outer oil seal plate 4 is provided with an upward-facing oil inlet 24; the encapsulation structure formed by the motor end cover 7 and the outer oil seal plate 4 is provided with a horizontal oil guide channel 32, one end of the oil guide channel 32 is vertically connected to the bottom of the oil inlet 24, and the other end of the oil guide channel 32 is connected to the upper part of the b ring chamber 28.

[0036] The lower end of the outer oil seal plate 4 is provided with a downward-facing oil drain port 39. A plug cap 18 is provided outside the oil drain port 39. When the oil drain port plug cap 18 is removed, the lower end of the a-ring 16 is connected to the outside through the oil drain port 39.

[0037] The working principle of the first embodiment is as follows:

[0038] Compared to the existing oil-slinging ring structure, this new structure is as follows: Figure 1 The grease-constraining ring 1 does not rotate with the shaft, while the collar 5 on the shaft rotates with the shaft.

[0039] Maintenance and oiling stage:

[0040] Remove the drain plug cap 18, then introduce fresh lubricating oil from the oil inlet 24. The fresh lubricating oil then flows into the b ring chamber 28 through the oil guide channel 32. The lubricating oil entering the b ring chamber 28 gradually accumulates at the bottom of the b ring chamber 28 under the action of gravity, and gradually overflows into the bearing ball ring cavity and the annular centrifugal grease constraint ring groove 3. When the liquid level in the annular centrifugal grease constraint ring groove 3 is higher than the lowest end of the annular grease overflow gap 17, the lubricating oil overflows into the a ring chamber 16 through the annular grease overflow gap 17. The lubricating oil overflowing into the a ring chamber 16 leaks out through the drain port 39 under the action of gravity, thus keeping the a ring chamber 16 empty. When the operator sees oil leaking out of the drain port 39, it means that the oil filling is complete. Immediately stop the oil filling to the oil inlet 24, and then re-plug the drain plug cap 18 to plug the oil inlet 24.

[0041] During motor operation: Because the annular grease overflow gap 17 is closer to the axis of the motor shaft 11 than the annular centrifugal grease constraint groove 3, the lubricating oil in the bearing ball ring cavity between the outer ring 9a and the inner ring 9b will only overflow into the annular centrifugal grease constraint groove 3 in a divergent manner under the action of centrifugal force, and will not escape into the a-ring 16 through the annular grease overflow gap 17; at the same time, since the grease constraint ring 1 does not rotate with the shaft, the lubricating oil overflowing into the annular centrifugal grease constraint groove 3 is not subject to centrifugal force, and thus the lubricating oil gradually accumulates under the action of gravity. The bottom of the annular centrifugal grease confinement groove 3 is such that when the liquid level at the bottom of the annular centrifugal grease confinement groove 3 exceeds the lower end of the bearing ball ring cavity, it will overflow back into the bearing ball ring cavity for lubrication. Meanwhile, the lubricating oil that enters the bearing ball ring cavity overflows back into the annular centrifugal grease confinement groove 3 in a divergent manner under the action of centrifugal force. This cycle repeats, effectively preventing the lubricating oil from escaping into the a-ring chamber 16 through the annular grease overflow gap 17, while realizing the circulating lubrication process of the bearing ball ring cavity. This effectively avoids the problem of lubricating oil escape caused by the centrifugal oil throwing process of traditional oil throwing rings.

[0042] While this new structure solves the problems of preventing oil escape and circulating lubrication, the grease constraint ring 1 in a stationary state also serves as a thermal isolation mechanism. However, it also addresses the issue of heat being trapped within the bearing ball ring cavity between the outer ring 9a and the inner ring 9b, preventing smooth heat dissipation. Therefore, based on the structure of the first embodiment described above, the following second embodiment is designed:

[0043] like Figures 3 to 9 The specific structure of the second embodiment shown is as follows:

[0044] Based on the structure of the first embodiment, it also includes a vertical heat-conducting oil injection pipe 22. The lower end 22a of the heat-conducting oil injection pipe 22 is coaxially inserted into the oil injection port 24. The heat-conducting oil injection pipe 22 is made of heat-conducting metal, and a number of heat dissipation fins are integrally arrayed on the outer wall of the heat-conducting oil injection pipe 22 along the length direction. An oil injection end cap 19 is detachably provided at the upper end of the heat-conducting oil injection pipe 22. The heat-conducting oil injection pipe 22 contains a gravity oil injection heat exchange channel 36 along the length direction.

[0045] A gas circulation port 20a is provided on the outer side of the upper end of the motor end cover 7; a circulation channel 20 with a longitudinal extension is provided on the upper part of the motor end cover 7, the lower end of the circulation channel 20 is vertically connected to the oil guide channel 32, and the upper end of the circulation channel 20 is connected to the gas circulation port 20a.

[0046] The upper end of the heat-conducting oil injection pipe 22 is vertically connected to a branch pipe 21 near the side of the motor end cover 7. The end of the branch pipe 21 is integrally provided with a locking seat 25. The locking seat 25 is locked to the outer side of the motor end cover 7 by locking bolts, so that the end of the branch pipe 21 is connected to the gas circulation port 20a.

[0047] Centrifugal blades 6 are arranged in a circular array around the axis of motor shaft 11 inside the a-ring chamber 16. The root of each centrifugal blade 6 is integrally connected to the collar 5. When the motor runs, the centrifugal blades 6 rotate synchronously with the collar 5, so that the edge area of ​​the a-ring chamber 16 away from the center forms centrifugal wind pressure, and the edge area of ​​the a-ring chamber 16 close to the center forms centrifugal negative pressure.

[0048] A vertical air-driven channel 31 is provided inside the outer oil seal plate 4. The air-driven channel 31 is coaxial with the gravity oil injection heat exchange channel 36. The lower end of the air-driven channel 31 is connected to the upper end of the a-ring 16, and the upper end is vertically connected to the lower side of one end of the oil guide channel 32. A vertically connected air-driven slide 12 is movably arranged coaxially inside the air-driven channel 31. The outer wall of the air-driven slide 12 is clearance-fitted with the inner wall of the air-driven channel 31. A conical air outlet 14 is integrally provided coaxially at the upper end of the air-driven slide 12. The outer diameter of the thick end of the conical air outlet 14 is larger than the inner diameter of the air-driven channel 31. The upper edge of the hole at the upper end of the air-driven channel 31 supports the lower edge of the conical air outlet 14. The interior of the integral structure formed by the air-driven slide 12 and the conical air outlet 14 is a vertically connected one-way air guide channel 15. A one-way valve 13 with the conduction direction facing upward is provided inside the one-way air guide channel 15.

[0049] The integrated structure formed by the pneumatic slide 12 and the conical air outlet 14 is made of polyvinylidene fluoride (PVDF), which has a low density of 1.17–1.79 g / cm³. 3With excellent hardness and temperature resistance, the one-way valve 13 is a low-resistance duckbill valve made of elastic silicone. Shaped like a duckbill, it automatically opens and closes based on fluid pressure, requiring no mechanical parts or external control. Its core advantages lie in its low opening pressure and minimal flow resistance, making it suitable for pressure-sensitive gas delivery systems. When there is upward gas pressure in the one-way airflow channel 15, the elastic valve's diaphragm is pushed open, allowing gas to pass smoothly, and the opening width adaptively expands as the flow rate increases. In the absence of pressure or under reverse pressure, the duckbill closes due to the material's elasticity, forming a seal to prevent gas backflow.

[0050] When the speed of the motor shaft 11 exceeds 2000 revolutions per minute, the centrifugal blades 6 cause the edge area of ​​the a-ring chamber 16 away from the center to form a sufficiently large centrifugal wind pressure. The wind pressure pushes the integrated structure formed by the wind-driven slide 12 and the conical air outlet 14 in the wind-driven channel 31 upward, and causes the conical air outlet 14 to rise to the lower end of the gravity oil injection heat exchange channel 36 that is coaxially connected. At the same time, the one-way valve 13 is opened under the action of upward air pressure.

[0051] When the conical air outlet 14 rises to the lower end of the coaxially connected gravity oil injection heat exchange channel 36, the lower end of the wind-driven slide 12 is still in the wind-driven channel 31.

[0052] Working principle of the second embodiment:

[0053] Maintenance and oiling stage:

[0054] Remove the drain plug cap 18 and the filling plug cap 19, then inject fresh lubricating oil from the upper end of the heat-conducting oil filling pipe 22 into the gravity oil filling heat exchange channel 36. Due to the action of the one-way valve 13, such as Figure 6 and 7 In state a, the lubricating oil exiting the lower end of the gravity-fed oil exchange heat exchange channel 36 does not directly reach the a-ring chamber 16 via the pneumatic channel 31, but instead flows into the b-ring chamber 28 via the oil guide channel 32. The lubricating oil entering the b-ring chamber 28 gradually accumulates at the bottom of the b-ring chamber 28 under gravity, and gradually overflows into the bearing ball ring cavity and the annular centrifugal grease confinement ring groove 3. When the liquid level in the annular centrifugal grease confinement ring groove 3 is higher than the lowest point of the annular grease overflow gap 17, the lubricating oil overflows through the annular grease overflow gap. The lubricating oil overflows from gap 17 into ring a 16. Under the action of gravity, the lubricating oil overflowing into ring a 16 leaks out through drain port 39, thus keeping ring a 16 hollow. When the operator sees oil leaking out of drain port 39, it means that the oil filling is complete. Immediately stop the oil filling through the heat-conducting oil filling pipe 22, and then reseal and install drain port plug cap 18 and oil filling end plug cap 19. The lubricating oil in the gravity oil filling heat exchange channel 36 flows into ring b 28 under the action of gravity and then enters a hollow state.

[0055] During motor operation: When the speed of the motor shaft 11 exceeds 2000 revolutions per minute, the balls in the bearing ball ring cavity between the outer ring 9a and the inner ring 9b will generate heat due to increased friction. If the heat accumulates, it will seriously affect the life of the bearing 9. At this time, since the annular grease overflow gap 17 is closer to the axis of the motor shaft 11 than the annular centrifugal grease constraint ring groove 3, the lubricating oil in the bearing ball ring cavity between the outer ring 9a and the inner ring 9b will only overflow into the annular centrifugal grease constraint ring groove 3 in a divergent manner under the action of centrifugal force, and will not escape into the a-ring 16 through the annular grease overflow gap 17. At the same time, since the grease constraint ring 1 does not rotate with the shaft, the lubricating oil overflowing into the annular centrifugal grease constraint ring groove 3 is not subject to centrifugal force, and thus, under the action of gravity, the lubricating oil gradually... The lubricant gradually accumulates at the bottom of the annular centrifugal grease confinement groove 3. When the liquid level at the bottom of the annular centrifugal grease confinement groove 3 exceeds the lower end of the bearing ball ring cavity, it will overflow back into the bearing ball ring cavity for lubrication. The lubricating oil that enters the bearing ball ring cavity overflows back into the annular centrifugal grease confinement groove 3 in a divergent manner under the action of centrifugal force. This cycle repeats, effectively preventing the lubricating oil from escaping into the a-ring chamber 16 through the annular grease overflow gap 17. At the same time, it realizes the circulating lubrication process of the bearing ball ring cavity. It effectively avoids the problem of lubricating oil escape caused by the centrifugal oil throwing process of traditional oil throwing rings. Based on the above principle, when the motor shaft 11 rotates at high speed, under the combined action of centrifugal force and gravity, lubricating oil will not accumulate in the annular centrifugal grease confinement groove 3 and the area of ​​the bearing ball ring cavity near the motor shaft 11.

[0056] Meanwhile, when the rotational speed of the motor shaft 11 exceeds 2000 revolutions per minute, the centrifugal blades 6 create a sufficiently large centrifugal air pressure in the edge region of the a-ring chamber 16 away from the center, and a centrifugal negative pressure is formed in the edge region of the a-ring chamber 16 near the center. The air pressure in the edge region of the a-ring chamber 16 away from the center pushes the integrated structure formed by the wind-driven slide 12 and the conical air outlet 14 in the wind-driven channel 31 upward, and causes the conical air outlet 14 to rise to the lower end of the coaxially connected gravity oil injection heat exchange channel 36, such as... Figure 6 and 7 In state b, at the same time, the one-way valve 13 is opened under the action of upward air pressure, so that the cone-shaped air outlet 14 continuously injects air into the lower end of the gravity oil injection heat exchange channel 36. The air entering the gravity oil injection heat exchange channel 36 finally flows through the branch pipe 21 → circulation channel 20 → oil guide channel 32 → b ring chamber 28 under the action of wind pressure, thereby pressurizing the b ring chamber 28; thus, the pressurized air in the b ring chamber 28 will continuously flow laterally through the bearing ball ring cavity between the bearing outer ring 9a and the bearing inner ring 9b, and then be drawn into the negative pressure area near the center of the a ring chamber 16 through the annular grease overflow gap 17; thus forming the above closed-loop gas circulation.

[0057] In the aforementioned closed-loop gas circulation, the heat inside the bearing ball ring cavity between the outer ring 9a and the inner ring 9b of the bearing is continuously discharged by the gas passing laterally. As the hot gas in the aforementioned gas circulation continuously flows through the gravity oil injection heat exchange channel 36, it is absorbed by the heat-conducting oil injection pipe 22 and the outer wall heat dissipation fins, thereby achieving efficient circulating heat dissipation of the bearing ball ring cavity between the outer ring 9a and the inner ring 9b of the bearing; reducing the degree of heat accumulation inside the high-speed bearing, and ultimately extending the bearing service life and friction loss.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A grease-lubricated cooling system for a motor end cover bearing, characterized in that: It includes a motor shaft (11) and a motor end cover (7); the motor end cover (7) rotates with the motor shaft (11) through a bearing (9), and the two ends of the motor end cover (7) are respectively encapsulated with an outer oil seal plate (4) and an inner oil seal plate (10). The inner side of the outer oil seal plate (4) in the encapsulated state forms an a ring chamber (16), and the inner oil seal plate (10) near the bearing (9) forms a b ring chamber (28). There is a retaining ring (8) on the retaining ring groove of the motor shaft (11) in the a ring compartment (16), and a collar (5) is sleeved on the motor shaft (11). The collar (5) is sandwiched between the retaining ring (8) and the inner ring (9b) of the bearing (9). The inner ring of the motor end cover (7) is fitted with a grease constraint ring (1), and the outer ring of the grease constraint ring (1) is sandwiched between the outer oil seal plate (4) and the outer ring (9a) of the bearing (9); an annular grease overflow gap (17) is formed between the inner ring of the grease constraint ring (1) and the collar (5); an annular centrifugal grease constraint ring groove (3) is provided on the side of the grease constraint ring (1) near the bearing (9); The bearing ball ring cavity between the bearing outer ring (9a) and the bearing inner ring (9b) is coaxially connected to the annular centrifugal grease constraint ring groove (3); the end of the annular grease overflow gap (17) near the bearing (9) is connected between the annular centrifugal grease constraint ring groove (3) and the bearing ball ring cavity, and the end away from the bearing (9) is connected to the a ring chamber (16). The annular grease overflow gap (17) is closer to the axis of the motor shaft (11) than the annular centrifugal grease constraint ring groove (3). When the motor is running, the lubricating oil in the bearing ball ring cavity between the bearing outer ring (9a) and the bearing inner ring (9b) will only overflow into the annular centrifugal grease constraint ring groove (3) in a divergent manner under the action of centrifugal force, and will not escape into the a ring chamber (16) through the annular grease overflow gap (17). The grease constraint ring (1) does not rotate with the shaft. The lubricating oil overflowing into the annular centrifugal grease constraint ring groove (3) is not subject to centrifugal force. Under the action of gravity, the lubricating oil gradually accumulates at the bottom of the annular centrifugal grease constraint ring groove (3). When the liquid level at the bottom of the annular centrifugal grease constraint ring groove (3) exceeds the lower end of the bearing ball ring cavity, it will overflow into the bearing ball ring cavity again for lubrication.

2. The grease lubrication and cooling system for a motor end cover bearing according to claim 1, characterized in that: The upper end of the outer oil seal plate (4) has an upward-facing oil inlet (24); the encapsulation structure formed by the combination of the motor end cover (7) and the outer oil seal plate (4) has a transverse oil guide channel (32), one end of the oil guide channel (32) is vertically connected to the bottom of the oil inlet (24), and the other end of the oil guide channel (32) is connected to the b ring chamber (28).

3. The grease lubrication and cooling system for a motor end cover bearing according to claim 2, characterized in that: The lower end of the outer oil seal plate (4) is provided with a downward-facing oil drain port (39), and a plug cap (18) is provided outside the oil drain port (39). When the oil drain port plug cap (18) is removed, the lower end of the a ring chamber (16) is connected to the outside through the oil drain port (39).

4. The grease lubrication and cooling system for a motor end cover bearing according to claim 3, characterized in that: It also includes a vertical heat-conducting oil injection pipe (22), the lower end (22a) of the heat-conducting oil injection pipe (22) is coaxially inserted into the oil injection port (24); the upper end of the heat-conducting oil injection pipe (22) is detachably provided with an oil injection end cap (19); the heat-conducting oil injection pipe (22) has a gravity oil injection heat exchange channel (36) along the length direction.

5. The grease lubrication and cooling system for a motor end cover bearing according to claim 4, characterized in that: A gas circulation port (20a) is provided on the outer side of the upper end of the motor end cover (7); a circulation channel (20) with a longitudinal extension is provided on the upper part of the motor end cover (7), the lower end of the circulation channel (20) is vertically connected to the oil guide channel (32), and the upper end of the circulation channel (20) is connected to the gas circulation port (20a). The upper end of the heat-conducting oil injection pipe (22) is vertically connected to a branch pipe (21) on the side near the motor end cover (7), and the end of the branch pipe (21) is connected to the gas circulation port (20a); centrifugal blades (6) are arranged in a circular array around the axis of the motor shaft (11) in the a ring chamber (16), and the root of each centrifugal blade (6) is integrally connected to the collar (5). When the motor runs, the centrifugal blades (6) rotate synchronously with the collar (5), so that the edge area of ​​the a ring chamber (16) away from the center forms centrifugal wind pressure, and the edge area of ​​the a ring chamber (16) near the center forms centrifugal negative pressure; A vertical air-driven channel (31) is provided inside the outer oil seal plate (4). The air-driven channel (31) is coaxial with the gravity oil injection heat exchange channel (36). The lower end of the air-driven channel (31) is connected to the upper end of the a-ring chamber (16), and the upper end is vertically connected to the lower side of one end of the oil guide channel (32). A vertically connected air-driven slide cylinder (12) is movably arranged coaxially inside the air-driven channel (31). The outer wall of the air-driven slide cylinder (12) is fitted with a clearance between the outer wall of the air-driven slide cylinder (12) and the inner wall of the air-driven channel (31). (12) A conical air outlet (14) is integrally provided on the upper end coaxially. The outer diameter of the thick end of the conical air outlet (14) is larger than the inner diameter of the wind channel (31). The upper end hole edge of the wind channel (31) supports the lower edge of the conical air outlet (14) upward. The interior of the integral structure formed by the wind-driven slide cylinder (12) and the conical air outlet (14) is a one-way air channel (15) that runs vertically through the air. A one-way valve (13) with the upward guiding direction is provided in the one-way air channel (15).

6. The grease lubrication and cooling system for a motor end cover bearing according to claim 4, characterized in that: When the rotational speed of the motor shaft (11) exceeds 2000 revolutions per minute, the centrifugal blades (6) cause the edge area of ​​the a-ring chamber (16) away from the center to form centrifugal wind pressure. The wind pressure pushes the integrated structure formed by the wind-driven slide (12) and the conical air outlet (14) in the wind-driven channel (31) upward, and causes the conical air outlet (14) to rise to the lower end of the coaxially connected gravity oil injection heat exchange channel (36). At the same time, the one-way valve (13) is opened under the action of upward air pressure. When the conical air outlet (14) rises to the lower end of the coaxially connected gravity oil injection heat exchange channel (36), the lower end of the wind-driven slide (12) is still in the wind-driven channel (31).

7. The grease lubrication and cooling system for a motor end cover bearing according to claim 6, characterized in that: The heat-conducting oil injection pipe (22) is made of heat-conducting metal, and the outer wall of the heat-conducting oil injection pipe (22) is integrally arrayed with several heat dissipation fins along the length direction; the integrated structure formed by the wind-driven slide cylinder (12) and the conical air outlet (14) is polyvinylidene fluoride, and the one-way valve (13) is a duckbill valve.

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