Motor end cover bearing grease lubrication cooling system

Abstract

The invention 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 rotatably matched with the motor shaft through a bearing, the outer oil seal disc and the inner oil seal disc are packaged at the two ends of the motor end cover respectively, an annular bin is formed in the inner side of the outer oil seal disc in the packaged state, and an annular bin is formed in the side, close to the bearing, of the inner oil seal disc. A snap spring is arranged on a snap spring groove of the motor shaft in the ring bin, a lantern ring is sleeved outside the motor shaft, and the lantern ring is clamped between the snap spring and a bearing inner ring of the bearing; the inner ring of the motor end cover is sleeved with a grease restraint ring, and the outer ring of the grease restraint ring is clamped between the outer oil seal disc and the bearing outer ring of the bearing; an annular grease overflow gap is formed between the inner ring of the grease restraint ring and the lantern ring; an annular centrifugal grease restraint ring groove is formed in one side, close to the bearing, of the grease restraint ring; and lubrication and heat dissipation can be remarkably 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] Further, the upper end of the outer oil seal disc has an upward oil injection port; the encapsulation structure formed by the combination of the motor end cover and the outer oil seal disc has a transverse oil guide channel, one end of the oil guide channel is vertically connected to the bottom of the oil injection port, and the other end of the oil guide channel is connected to the ring bin.

[0010] Further, the lower end of the outer oil seal disc is provided with a downward oil discharge port, and a plug cap is arranged outside the oil discharge port; when the plug cap of the oil discharge port is removed, the lower end of the ring bin is connected to the outside through the oil discharge port.

[0011] Further, the annular grease overflow gap is closer to the axis of the motor shaft than the annular centrifugal grease confinement ring groove; during the operation of the motor, the lubricating oil in the bearing ball ring cavity between the outer ring and the inner ring of the bearing will only be side-overflowed into the annular centrifugal grease confinement ring groove under the action of centrifugal force, and will not escape into the ring bin through the annular grease overflow gap; the grease confinement ring does not rotate with the shaft, and the lubricating oil side-overflowed into the annular centrifugal grease confinement ring groove is not affected by the centrifugal force, and gradually accumulates at the bottom of the annular centrifugal grease confinement ring groove under the action of gravity; when the liquid surface accumulated at the bottom of the annular centrifugal grease confinement ring groove exceeds the lower end of the bearing ball ring cavity, the lubricating oil will be side-overflowed into the bearing ball ring cavity again.

[0012] Further, it further includes a vertical heat-conducting oil injection pipe, the pipe body of the heat-conducting oil injection pipe is coaxially inserted into the oil injection port at the lower end; an oil injection end plug cap is detachably arranged at the upper end of the heat-conducting oil injection pipe; the heat-conducting oil injection pipe is a gravity oil injection heat exchange channel along the length direction.

[0013] Further, a gas circulation port is arranged outside the upper end of the motor end cover; the upper part of the motor end cover is provided with a circulation channel extending in the longitudinal direction, 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 on one side close to the motor end cover, and the distal end of the branch pipe is connected to the gas circulation port; a plurality of centrifugal blades are arranged in a circumferential array around the axis of the motor shaft in the ring bin, the roots of the centrifugal blades are integrally connected to the collar, and the centrifugal blades rotate synchronously with the collar during the operation of the motor, so that the edge region far from the center of the ring bin forms a centrifugal wind pressure, and the edge region close to the center of the ring bin forms a centrifugal negative pressure.

[0015] The outer oil seal disc is provided with a vertical air moving channel, the air moving channel is coaxial with the gravity oil injection heat exchange channel, the lower end of the air moving channel is communicated with the upper end of the ring bin, and the upper end is vertically communicated with one end of the oil guide channel; the air moving channel is movably provided with an air moving sliding cylinder penetrating up and down in a coaxial manner, and the air moving sliding cylinder is gap-fitted with the inner wall of the air moving channel; the upper end of the air moving sliding cylinder is integrally provided with a conical air outlet head in a coaxial manner, the outer diameter of the thick end of the conical air outlet head is larger than the inner diameter of the air moving channel, and the hole edge of the upper end of the air moving channel supports the lower end edge of the conical air outlet head upward; the integral structure formed by the air moving sliding cylinder and the conical air outlet head is internally provided with a one-way air guide channel penetrating up and down, and the one-way valve is provided in the one-way air guide channel and faces upward.

[0016] Further, when the rotating speed of the motor shaft exceeds the number of revolutions per minute, the centrifugal blades make the ring bin far away from the edge region of the center to form a centrifugal air pressure, the air pressure pushes the integral structure formed by the air moving sliding cylinder and the conical air outlet head upward, and the conical air outlet head rises to the lower end of the gravity oil injection heat exchange channel in a coaxial manner, and at the same time, the one-way valve is opened under the action of the upward air pressure;

[0017] When the conical air outlet head rises to the lower end of the gravity oil injection heat exchange channel in a coaxial manner, the lower end of the air moving sliding cylinder is still in the air moving channel.

[0018] Further, the heat-conducting oil injection pipe is made of heat-conducting metal material, and a plurality of heat dissipation fins are integrally arranged on the outer wall of the heat-conducting oil injection pipe along the length direction; the integral structure formed by the air moving sliding cylinder and the conical air outlet head is made of polyvinylidene fluoride, and the one-way valve is a duckbill valve.

[0019] Beneficial effects: during the operation of the motor, the lubricating oil in the bearing ball ring cavity only presents a divergent side overflow into the annular centrifugal oil constraint ring groove under the action of the centrifugal force, and will not escape into the ring bin through the annular oil overflow gap; at the same time, since the oil constraint ring does not rotate with the shaft, the lubricating oil side overflowed into the annular centrifugal oil constraint ring groove is not affected by the centrifugal force, and gradually accumulates at the bottom of the annular centrifugal oil constraint ring groove under the action of gravity, when the liquid surface accumulated at the bottom of the annular centrifugal oil constraint ring groove exceeds the lower end of the bearing ball ring cavity, the lubricating oil will be side overflowed into the bearing ball ring cavity again, and the lubricating oil entering the bearing ball ring cavity presents a divergent side overflow into the annular centrifugal oil constraint ring groove under the action of the centrifugal force, so as to realize the circulation lubrication process of the bearing ball ring cavity, and effectively avoid the problem that the lubricating oil escapes through the annular oil overflow gap;

[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 of 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 rotatably connected with the motor shaft 11 through the bearing 9, and the two ends of the motor end cover 7 are coaxially packaged with the outer oil seal plate 4 and the inner oil seal plate 10 respectively through flange bolts, the inner side of the outer oil seal plate 4 in the packaged state forms an a ring chamber 16, and the side of the inner oil seal plate 10 close to the bearing 9 forms a b ring chamber 28; the a sealing lip 29 of the inner ring of the outer oil seal plate 4 and the b sealing lip 30 of the inner ring of the inner oil seal plate 10 are both sealingly rotatably connected with the outer ring of the motor shaft 11.

[0033] The motor shaft 11 is sleeved with a circlip spring 8 through a circlip spring slot, the circlip spring 8 is in the a ring chamber 16, and the motor shaft 11 is coaxially sleeved with a collar 5, and the collar 5 is clamped between the circlip spring 8 and the bearing inner ring 9b of the bearing 9.

[0034] The inner ring of the motor end cover 7 is coaxially sleeved with a grease restraining ring 1, the outer ring of the grease restraining ring 1 is tightly clamped between the outer oil seal plate 4 and the bearing outer ring 9a of the bearing 9, the inner ring of the grease restraining ring 1 and the collar 5 form a ring-shaped grease overflow gap 17, the side of the grease restraining ring 1 close to the bearing 9 is provided with a ring-shaped centrifugal grease restraining ring groove 3, the bearing ball ring cavity between the bearing outer ring 9a and the bearing inner ring 9b is coaxially communicated with the ring-shaped centrifugal grease restraining ring groove 3, one end of the ring-shaped grease overflow gap 17 is communicated between the ring-shaped centrifugal grease restraining ring groove 3 and the bearing ball ring cavity close to the bearing 9, and the other end of the ring-shaped grease overflow gap 17 is communicated with the a ring chamber 16 away from the bearing 9.

[0035] The upper end of the outer oil seal plate 4 is provided with an oil inlet 24 facing upward, the packaging structure formed by the combination of 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 communicated with the bottom of the oil inlet 24, and the other end of the oil guide channel 32 is communicated with the upper part of the b ring chamber 28.

[0036] The lower end of the outer oil seal plate 4 is provided with an oil outlet 39 facing downward, the oil outlet 39 is provided with a plug cap 18 outside, and when the plug cap 18 of the oil outlet is removed, the lower end of the a ring chamber 16 is communicated with the outside through the oil outlet 39.

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

[0038] Compared with the existing oil throwing ring structure Figure 1 The grease restraining ring 1 does not rotate with the shaft, and the collar 5 on the shaft rotates with the shaft.

[0039] Maintenance 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] On the basis of the structure of the first embodiment, a vertical heat-conducting oil injection pipe 22 is further included, a lower end 22a of the pipe body of the heat-conducting oil injection pipe 22 is coaxially embedded in the oil injection port 24; the heat-conducting oil injection pipe 22 is made of heat-conducting metal material, and a plurality of heat dissipation fins are integrally arranged on the outer wall of the heat-conducting oil injection pipe 22 along the length direction; an oil injection end cap 19 is detachably arranged on the upper end of the heat-conducting oil injection pipe 22; the heat-conducting oil injection pipe 22 is a gravity oil injection heat exchange channel 36 along the length direction;

[0045] A gas circulation port 20a is arranged on the outer side of the upper end of the motor end cover 7; the upper part of the motor end cover 7 is provided with a circulation channel 20 extending in the longitudinal direction, 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 on one side close to the motor end cover 7, the distal end of the branch pipe 21 is integrally provided with a lock hole seat 25, and the lock hole seat 25 is locked on the outer side of the motor end cover 7 by a locking bolt, so that the distal end of the branch pipe 21 is connected to the gas circulation port 20a;

[0047] A plurality of centrifugal blades 6 are arranged in a circumferential array around the axis of the motor shaft 11 in the a-ring chamber 16, the root of each centrifugal blade 6 is integrally connected to the sleeve ring 5, and the centrifugal blades 6 rotate synchronously with the sleeve ring 5 during motor operation, so that the edge region far from the center of the a-ring chamber 16 forms a centrifugal air pressure, and the edge region close to the center of the a-ring chamber 16 forms a centrifugal negative pressure;

[0048] A vertical air movement channel 31 is arranged in the outer oil seal disc 4, the air movement channel 31 is coaxial with the gravity oil injection heat exchange channel 36, the lower end of the air movement channel 31 is connected to the upper end of the a-ring chamber 16, and the upper end is vertically connected to one side of the lower side of the oil guide channel 32; an air movement sliding cylinder 12 penetrating up and down is movably arranged in the air movement channel 31 coaxially, and the air movement sliding cylinder 12 is gap-fitted between the outer wall of the air movement sliding cylinder 12 and the inner wall of the air movement channel 31; a conical air outlet head 14 is integrally arranged on the upper end of the air movement sliding cylinder 12 coaxially, the outer diameter of the thick end of the conical air outlet head 14 is larger than the inner diameter of the air movement channel 31, and the hole rim of the upper end of the air movement channel 31 supports the lower end edge of the conical air outlet head 14 upward; the inside of the integrated structure formed by the air movement sliding cylinder 12 and the conical air outlet head 14 is a one-way air guide channel 15 penetrating up and down, and a one-way valve 13 with the direction of conduction upward is arranged in the one-way air guide channel 15;

[0049] The integrated structure formed by the air movement sliding cylinder 12 and the conical air outlet head 14 is made of polyvinylidene fluoride (PVDF), which has a low density of 1.17-1.79 g / cm 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] Motor running stage: when the rotating speed of the motor shaft 11 exceeds 2000 rpm, the bearing ball ring cavity between the bearing outer ring 9a and the bearing inner ring 9b will generate heat due to increased friction, and if the heat accumulates, it will seriously affect the service 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 relative to the annular centrifugal grease containment ring groove 3, the lubricating oil in the bearing ball ring cavity between the bearing outer ring 9a and the bearing inner ring 9b will only be side-overflowed into the annular centrifugal grease containment ring groove 3 under the action of centrifugal force, and will not escape into the a ring chamber 16 through the annular grease overflow gap 17; At the same time, since the grease containment ring 1 does not rotate with the shaft, the lubricating oil side-overflowed into the annular centrifugal grease containment ring groove 3 is not affected by the centrifugal force, and gradually accumulates at the bottom of the annular centrifugal grease containment ring groove 3 under the action of gravity. When the liquid surface accumulated at the bottom of the annular centrifugal grease containment ring groove 3 exceeds the lower end of the bearing ball ring cavity, it will be side-overflowed into the bearing ball ring cavity again to lubricate. The lubricating oil entering the bearing ball ring cavity will be side-overflowed into the annular centrifugal grease containment ring groove 3 under the action of centrifugal force, and this cycle will continue, effectively avoiding the problem of lubricating oil escaping through the annular grease overflow gap 17 into the a ring chamber 16, and realizing the process of circulating lubrication of the bearing ball ring cavity; effectively avoiding the problem of lubricating oil escaping caused by the centrifugal oil throwing process of the traditional oil throwing ring; based on the above principle, under the combined action of centrifugal force and gravity, the annular centrifugal grease containment ring groove 3 and the bearing ball ring cavity near the motor shaft 11 will not accumulate lubricating oil when the motor shaft 11 rotates at high speed;

[0056] At the same time, when the rotating speed of the motor shaft 11 exceeds 2000 rpm, the centrifugal blade 6 forms a large enough centrifugal air pressure in the edge area of the a ring chamber 16 away from the center, and a negative pressure in the edge area of the a ring chamber 16 close to the center. The air pressure in the edge area of the a ring chamber 16 away from the center pushes the integrated structure of the air-moving sliding cylinder 12 and the conical air outlet head 14 in the air-moving channel 31 upward, and makes the conical air outlet head 14 rise to the lower end of the gravity oil injection heat exchange channel 36 in coaxial docking communication, as shown in Figure 6 and 7 b state, and at the same time the one-way valve 13 is opened under the action of the upward air pressure, so that the conical air outlet head 14 continuously injects air into the lower end of the gravity oil injection heat exchange channel 36, and the air entering the gravity oil injection heat exchange channel 36 finally flows through the branch pipe 21→the circulating channel 20→the oil guiding channel 32→the b ring chamber 28 in turn under the action of air pressure, thereby pressurizing the b ring chamber 28; 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 sucked into the negative pressure area of the a ring chamber 16 close to the center through the annular grease overflow gap 17; thereby forming the above-mentioned closed-loop gas circulation;

[0057] In the closed loop gas circulation, the heat in the bearing ball ring cavity between the bearing outer ring 9a and the bearing inner ring 9b is continuously discharged by the transversely passing gas, and the hot gas in the gas circulation is continuously passed through the gravity oil injection heat exchange channel 36 and is heated by the heat conduction oil pipe 22 and the outer wall heat dissipation fins, thereby achieving efficient circulating heat dissipation of the bearing ball ring cavity between the bearing outer ring 9a and the bearing inner ring 9b; the heat accumulation degree in the high-speed bearing is reduced, thereby ultimately prolonging the service life and friction loss of the bearing.

[0058] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. An electric machine end shield bearing grease lubrication cooling system characterized by: It includes motor shaft (11) and motor end cover (7); motor end cover (7) is rotatably connected with motor shaft (11) through bearing (9), and the two ends of motor end cover (7) are respectively sealed outer oil seal plate (4) and inner oil seal plate (10), and the inner side of sealed outer oil seal plate (4) forms a ring warehouse (16), and the side of inner oil seal plate (10) close to bearing (9) forms b ring warehouse (28); The motor shaft (11) has a snap spring (8) in the snap spring slot in the a ring warehouse (16), and the motor shaft (11) is sleeved with a collar (5), and the collar (5) is clamped between the snap spring (8) and the bearing inner ring (9b) of the bearing (9); The inner ring of the motor end cover (7) is sleeved with a grease restraining ring (1), and the outer ring of the grease restraining ring (1) is clamped between the outer oil seal plate (4) and the bearing outer ring (9a) of the bearing (9); the inner ring of the grease restraining ring (1) and the collar (5) form an annular grease overflow gap (17); the side of the grease restraining ring (1) close to the bearing (9) is provided with an annular centrifugal grease restraining ring groove (3); The bearing ball ring cavity between the bearing outer ring (9a) and the bearing inner ring (9b) is coaxially connected with the annular centrifugal grease restraining ring groove (3); the annular grease overflow gap (17) is connected between the annular centrifugal grease restraining ring groove (3) and the bearing ball ring cavity at one end close to the bearing (9), and at the other end away from the bearing (9), it is connected with the a ring warehouse (16).

2. A grease lubricated cooling system for a motor endshield bearing as set forth in claim 1, characterized in that: The upper end of the outer oil seal plate (4) has an upward oil inlet (24); the sealing 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 with the bottom of the oil inlet (24), and the other end of the oil guide channel (32) is connected with the b ring warehouse (28).

3. A grease lubricated cooling system for a motor endshield bearing as set forth in claim 2 wherein: The lower end of the outer oil seal plate (4) is provided with a downward oil outlet (39), and the oil outlet (39) is provided with a plug cap (18); when the plug cap (18) is removed, the lower end of the a ring warehouse (16) is connected with the outside through the oil outlet (39).

4. A grease lubricated cooling system for a motor end shield bearing as set forth in claim 3 wherein: The annular grease overflow gap (17) is closer to the axis of the motor shaft (11) than the annular centrifugal grease restraining ring groove (3); during the operation of the motor, the lubricating oil in the bearing ball ring cavity between the bearing outer ring (9a) and the bearing inner ring (9b) will only be side overflow into the annular centrifugal grease restraining ring groove (3) under the action of centrifugal force, and will not escape into the a ring warehouse (16) through the annular grease overflow gap (17); the grease restraining ring (1) does not rotate with the shaft, and the lubricating oil side overflowed into the annular centrifugal grease restraining ring groove (3) is not affected by centrifugal force, and gradually accumulates at the bottom of the annular centrifugal grease restraining ring groove (3) under the action of gravity; when the liquid surface accumulated at the bottom of the annular centrifugal grease restraining ring groove (3) exceeds the lower end of the bearing ball ring cavity, it will be side overflowed into the bearing ball ring cavity again.

5. A grease lubricated cooling system for a motor end shield bearing as set forth in claim 4 wherein: It also includes vertical heat conduction oil injection pipe (22), the pipe body lower end (22a) of the heat conduction oil injection pipe (22) is coaxially inserted into the oil injection port (24);The upper end of the heat conduction oil injection pipe (22) is detachably provided with an oil injection end cap (19);The heat conduction oil injection pipe (22) is a length direction gravity oil injection heat exchange channel (36) inside.

6. A grease lubricated cooling system for a motor end shield bearing as set forth in claim 5 wherein: The upper end of the motor end cover (7) is provided with a gas circulation port (20a) outside;The upper part of the motor end cover (7) is provided with a circulation channel (20) extending longitudinally, the lower end of the circulation channel (20) is vertically connected with the oil guide channel (32), and the upper end of the circulation channel (20) is connected with the gas circulation port (20a); The upper end of the heat conduction oil injection pipe (22) is vertically connected with a branch pipe (21) on one side close to the motor end cover (7), the end of the branch pipe (21) is connected with the gas circulation port (20a);A ring warehouse (16) is provided with centrifugal blades (6) arranged in a circumferential array around the axis of the motor shaft (11), the root of each centrifugal blade (6) is integrally connected to the sleeve ring (5), and the centrifugal blades (6) rotate synchronously with the sleeve ring (5) during motor operation, so that the edge area far from the center of the a ring warehouse (16) forms a centrifugal wind pressure, and the edge area close to the center of the a ring warehouse (16) forms a centrifugal negative pressure; The outer oil seal disc (4) is provided with a vertical air moving channel (31), the air moving channel (31) is coaxial with the gravity oil injection heat exchange channel (36), the lower end of the air moving channel (31) is connected with the upper end of the a ring warehouse (16), and the upper end is vertically connected with one side of the lower end of the oil guide channel (32);The air moving channel (31) is movably provided with an air moving sliding cylinder (12) penetrating up and down, and the air moving sliding cylinder (12) is gap-fitted between the outer wall of the air moving sliding cylinder (12) and the inner wall of the air moving channel (31);The air moving sliding cylinder (12) is integrally provided with a conical air outlet head (14) on the upper end, the outer diameter of the thick end of the conical air outlet head (14) is larger than the inner diameter of the air moving channel (31), and the hole edge of the upper end of the air moving channel (31) supports the lower end edge of the conical air outlet head (14) upward;The inside of the integrated structure of the air moving sliding cylinder (12) and the conical air outlet head (14) is a one-way air guide channel (15) penetrating up and down, and the one-way air guide channel (15) is provided with a one-way valve (13) with the direction of conduction upward.

7. A grease lubricated cooling system for a motor end shield bearing as set forth in claim 5 wherein: When the rotating speed of the motor shaft (11) exceeds 2000 rpm, the centrifugal blades (6) make the edge area far from the center of the a ring warehouse (16) form a centrifugal wind pressure, the wind pressure pushes the integrated structure of the air moving sliding cylinder (12) and the conical air outlet head (14) in the air moving channel (31) upward, and the conical air outlet head (14) rises to the lower end of the gravity oil injection heat exchange channel (36) coaxially connected and communicated, at the same time, the one-way valve (13) is opened under the action of the upward air pressure; When the conical air outlet head (14) rises to the lower end of the gravity oil injection heat exchange channel (36) coaxially connected and communicated, the lower end of the air moving sliding cylinder (12) is still in the air moving channel (31).

8. A motor end-shield bearing grease lubrication cooling system as set forth in claim 7 wherein: The heat-conducting oil injection pipe (22) is made of heat-conductive metal material, and a plurality of heat-dissipating fins are integrally arranged on the outer wall of the heat-conducting oil injection pipe (22) along the length direction; the integrated structure of the air slide cylinder (12) and the conical air outlet head (14) is made of polyvinylidene fluoride, and the one-way valve (13) is a duckbill valve.

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