Double-bearing lubricating oil way
By designing a dual-inlet oil system, an oil slinger, and a sealing ring structure for the dual-bearing motor, the problem of uneven lubrication was solved, achieving uniform lubrication of the bearings and efficient reuse of lubricating oil, reducing noise and wear, and extending bearing life.
Patent Information
- Application Number
- CN202520781235.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-23
AI Technical Summary
In existing technologies, dual-bearing motors cannot achieve uniform oil supply during lubrication, resulting in excessive lubricating grease in one bearing and insufficient lubrication in the other, causing problems such as bearing overheating, excessive vibration, excessive noise, excessive wear, and short lifespan.
A dual-bearing lubrication circuit was designed, which uses two independent oil inlet circuits to supply oil to two bearings respectively. The uniform distribution of lubricating grease is ensured by an oil slinger and sealing ring structure. Combined with a return pipeline and a magnetic filtration system, the lubricating grease can be reused and metal shavings can be removed.
It achieves uniform lubrication of the two bearings, reduces lubricant consumption, reduces bearing overheating, vibration and noise, extends bearing life, and improves the reusability of lubricant.
Smart Images
Figure CN223868413U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bearing lubrication technology, specifically to a dual-bearing lubrication oil circuit. Background Technology
[0002] For motors with large axial and radial loads, a single bearing at each end is insufficient to meet the requirements for bearing life and other aspects, necessitating the use of dual bearings. Dual bearings typically consist of one ball bearing and one cylindrical roller bearing, but other bearing combinations can also be used. In the past, many designs for dual bearings still adopted a single-path oil inlet scheme, which resulted in uneven lubrication between the two bearings. This could lead to one bearing receiving excessive grease while the other receives insufficient grease, ultimately causing bearing overheating, excessive vibration, high noise, excessive wear, and short lifespan. Utility Model Content
[0003] To achieve the above objectives, this utility model specifically adopts the following technical solution:
[0004] A dual-bearing lubrication circuit includes a bearing housing, in which a bearing 1 and a bearing 2 are installed. An oil inlet passage 1 and an oil inlet passage 2 are respectively provided on the bearing housing at positions corresponding to the left side of bearing 1 and the right side of bearing 2. An oil slinger is installed between bearing 1 and bearing 2 within the bearing housing, with both sides of the oil slinger abutting and fixed against the inner rings of bearing 1 and bearing 2 at corresponding positions. An oil inlet pipe 1 and an oil inlet pipe 2 are respectively installed on the top of the bearing housing at positions corresponding to oil inlet passage 1 and oil inlet passage 2. An oil outlet passage is provided at the bottom of the bearing housing at positions corresponding to the oil slinger, and an oil collection box is installed at the bottom of the bearing housing at positions corresponding to the oil outlet passage.
[0005] Furthermore, a shaft seal cover is provided on the left side of bearing one, corresponding to the ball clearance position of bearing one. A connecting ring is installed inside the bearing housing on the left side corresponding to the oil inlet passage one, and the connecting ring is fixed to the shaft seal cover one. A shaft seal cover is provided on the right side of bearing two, corresponding to the roller clearance position of bearing two. A connecting ring is installed inside the bearing housing on the right side corresponding to the oil inlet passage two, and the connecting ring is fixed to the shaft seal cover two. The shaft seal cover and the connecting ring work together to connect the oil inlet passage and the clearance position of the bearing, while preventing the lubricating grease from being thrown out after flowing out of the oil inlet passage.
[0006] Furthermore, a base ring is fixed inside the oil slinger. The width of the base ring is greater than the width of the oil slinger. Both sides of the base ring abut against the inner rings of bearing one and bearing two at corresponding positions. Sealing grooves are pre-set on both sides of the base ring, and sealing rings are installed within these grooves, abutting against the surfaces of the inner rings of bearing one and bearing two at corresponding positions. The sealing rings enhance the sealing effect on the lubricating grease after bearing installation, preventing the lubricating grease from leaking out as the shaft rotates.
[0007] Furthermore, multiple equally spaced notches are pre-set on both sides of the base ring at the sealing groove position. A protrusion is fixed on the sealing ring at the corresponding notch position, with the protrusion located inside the notch. A groove is pre-set in the middle of the outer side of the oil slinger. The notches secure the sealing ring to the oil slinger, and the high frictional resistance between the sealing ring and the bearing ensures that the oil slinger can be rotated.
[0008] Furthermore, a backflow pipe is installed above the bearing housing near oil inlet pipe 1 and oil inlet pipe 2. A branch pipe is fixed to the left end of backflow pipe 1 facing oil inlet pipe 1 and oil inlet pipe 2, and the branch pipe is connected to both oil inlet pipe 1 and oil inlet pipe 2. An oil filter is installed at the bottom right end of backflow pipe 1, and backflow pipe 2 is connected to the bottom of the oil filter. An oil suction pipe is connected to the bottom of backflow pipe 2, and the left end of the oil suction pipe is fixed to the middle of the oil collection box. An oil suction cylinder is connected to the oil suction pipe, and one-way valve 1 and one-way valve 2 are respectively installed on the oil suction pipes on both sides of the oil suction cylinder. Both one-way valve 1 and one-way valve 2 are one-way configurations with left inlet and right blockage. A piston is installed inside the oil suction cylinder. The lubricating grease in the oil collection box can be extracted and reused, improving the reuse rate and reducing lubricating grease consumption. It should be noted that when using high-viscosity grease, the grease is difficult to pass through the oil filter, and the oil filter needs to be removed.
[0009] Furthermore, a turntable is installed at the bottom of the oil extraction cylinder, and a connecting rod is installed between the turntable and the piston. Hinges are hinged to both ends of the connecting rod, and the hinges are fixed to the corresponding positions of the piston, the eccentric position of the turntable, and a motor is installed at the center of the turntable. The output end of the motor is fixedly connected to the turntable. Rotation of the turntable drives the piston to reciprocate through its eccentric feature, resulting in a simple structure.
[0010] Furthermore, a plug is installed at the bottom opening of the second reflux pipe. This allows for the collection of metal shavings generated by the rotational friction of bearings, oil slingers, and other rotating components in the lubricating grease.
[0011] Furthermore, a magnet is installed on the plug inside the second reflux pipe. The magnet can actively attract metal shavings in the lubricating grease, thereby effectively reducing the metal shavings content in the circulating lubricating grease.
[0012] The beneficial effects of this utility model are as follows:
[0013] 1. This utility model provides two oil inlet channels to supply two bearings respectively, ensuring that each bearing can receive sufficient lubricating grease through its own oil inlet channel.
[0014] 2. The present invention includes an oil slinger to facilitate the brushing out of the lubricating grease between the two bearings, ensuring that the internal oil can be effectively and smoothly discharged. At the same time, the sealing ring and protrusion on the oil slinger increase the seal between the oil slinger and the bearing, preventing the lubricating grease from seeping out.
[0015] 3. The present invention includes a return pipeline, which can extract the lubricating grease from the upper and middle layers of the oil collection box for reuse, thereby reducing the daily consumption of lubricating grease.
[0016] 4. In this utility model, the oil extraction pipe is placed near the bottom of the second reflux pipe and equipped with a magnet, which can collect metal shavings in the lubricating grease, thereby effectively reducing the metal shavings content in the circulating lubricating grease. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle;
[0019] Figure 3 This is a perspective view of the oil-slinging disc in this utility model;
[0020] Figure 4 This is a cross-sectional view of the oil slinger in this utility model;
[0021] Figure 5 This is a utility model Figure 4 Enlarged view of point B in the middle;
[0022] Figure 6 This is a schematic diagram of the reflux tube arrangement in this utility model;
[0023] Figure 7 This is a cross-sectional view of the oil extraction cylinder in this utility model.
[0024] Attached reference numerals: 1. Bearing housing; 2. Oil inlet passage one; 3. Oil inlet passage two; 4. Shaft seal cover one; 5. Connecting ring one; 6. Shaft seal cover two; 7. Connecting ring two; 8. Oil inlet pipe one; 9. Oil inlet pipe two; 10. Oil slinger; 11. Oil outlet passage; 12. Oil collection box; 13. Bearing one; 14. Ball clearance; 15. Bearing two; 16. Roller clearance; 17. Disc base ring; 18. 19. Sealing groove; 20. Sealing ring; 21. Bayonet; 22. Protrusion; 23. Reverse flow pipe one; 24. Branch pipe; 25. Reverse flow pipe two; 26. Oil filter; 27. Suction pipe; 28. Suction cylinder; 29. Check valve one; 30. Check valve two; 31. Turntable; 32. Connecting rod; 33. Hinge seat; 34. Piston; 35. Motor; 36. Pipe plug; 37. Magnet. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0026] This application provides a dual-bearing lubrication circuit, mainly solving the problem that a single-path oil inlet cannot evenly supply lubricating grease to both bearings under dual-bearing conditions, and provides the following technical solution, which will be discussed below. Figures 1-7 Please provide a detailed explanation:
[0027] A dual-bearing lubrication circuit includes a bearing housing 1, in which a first bearing 13 and a second bearing 15 are installed. In this embodiment, the first bearing 13 is a ball bearing, and the second bearing 15 is a roller bearing. An oil inlet passage 12 and an oil inlet passage 23 are respectively provided on the bearing housing 1 at the left side of the first bearing 13 and the right side of the second bearing 15. A shaft seal cover 4 is provided on the left side of the first bearing 13 at the position corresponding to the ball clearance 14 of the first bearing 13. A connecting ring 5 is installed in the bearing housing 1 at the left side of the first oil inlet passage 2 and is fixed to the shaft seal cover 4. A shaft seal cover 6 is provided on the right side of the second bearing 15 at the position corresponding to the ball clearance 16 of the second bearing 15. A connecting ring 7 is installed in the bearing housing 1 at the right side of the second oil inlet passage 23 and is fixed to the shaft seal cover 6.
[0028] An oil slinger 10 is installed between bearing 13 and bearing 15 inside bearing housing 1. The two sides of the oil slinger 10 are fixed to the inner rings of bearing 13 and bearing 15 at the corresponding positions. Oil inlet pipe 8 and oil inlet pipe 9 are installed on the top of bearing housing 1 at the positions corresponding to oil inlet 2 and oil inlet 3, respectively. Oil outlet 11 is opened at the bottom of bearing housing 1 at the position corresponding to oil slinger 10. Oil collection box 12 is installed at the bottom of bearing housing 1 at the position corresponding to oil outlet 11.
[0029] During lubrication, bearing grease is added from oil inlet pipe 8 and oil inlet pipe 9 respectively. The grease flows down through oil inlet pipe 8 and oil inlet pipe 9. The grease at bearing 13 flows into oil inlet passage 2, and is then blocked by shaft seal cover 4 and connecting ring 5. The grease then enters bearing 13 through ball gap 14 to lubricate the balls. The grease at bearing 25 flows into oil inlet passage 3, and is then blocked by shaft seal cover 6 and connecting ring 7. The grease then enters bearing 25 through roller gap 16 to lubricate the cylindrical rollers.
[0030] As lubricating oil continuously enters, the lubricating grease will accumulate in the bearing housing 1 at the position of the oil slinger 10 and adhere to the oil slinger 10. The oil slinger 10 is driven to rotate by the frictional resistance with bearing 13 and bearing 2 15, thereby throwing out the attached lubricating grease. The lubricating grease flows downward under the force of gravity and continuous injection, flows out through the oil outlet 11, and flows into the oil collection box 12, forming a dual-inlet single-outlet oil structure for the dual bearings.
[0031] In some embodiments, a base ring 17 is fixed inside the oil slinger 10. The width of the base ring 17 is greater than the width of the oil slinger 10. The two sides of the base ring 17 abut against the inner rings of the bearing 13 and bearing 15 at corresponding positions. A sealing groove 18 is provided on both sides of the base ring 17. A sealing ring 19 is installed in the sealing groove 18. The sealing ring 19 abuts against the inner ring surfaces of the bearing 13 and bearing 15 at corresponding positions. Multiple equally spaced slots 20 are also provided on both sides of the base ring 17 at the sealing groove 18. A protrusion 21 is fixed on the sealing ring 19 at the position corresponding to the slot 20. The protrusion 21 is located in the slot 20. A groove 22 is provided at the middle position of the outer side of the oil slinger 10.
[0032] The sealing ring 19 can seal the inner side of bearing 13 and bearing 25, preventing lubricating grease from seeping out through the gap between the inner ring of the bearing and the shaft, thus ensuring the sealing effect of the lubricating grease in bearing 13 and bearing 25. At the same time, the structure of the snap 20 and the protrusion 21 ensures that the sealing ring 19 can always be fixed relative to the oil slinger 10, and can be driven by the rotation of bearing 13 and bearing 25, ensuring that the oil slinger 10 can rotate to sling oil. The groove 22 facilitates the slinging of grease from the outer surface of the oil slinger 10.
[0033] In some embodiments, a backflow pipe 23 is provided above the bearing housing 1 near the oil inlet pipe 8 and the oil inlet pipe 9. A branch pipe 24 is fixed to the left end of the backflow pipe 23 facing the oil inlet pipe 8 and the oil inlet pipe 9. The branch pipe 24 is connected to both the oil inlet pipe 8 and the oil inlet pipe 9. An oil filter 26 is installed at the bottom right end of the backflow pipe 23. A backflow pipe 25 is connected to the bottom of the oil filter 26. An oil suction pipe 27 is connected to the bottom of the backflow pipe 25. The left end of the oil suction pipe 27 is fixed to the middle of the oil collection box 12.
[0034] An oil extraction tube 28 is connected to the oil extraction tube 27. One-way valve 29 and one-way valve 30 are respectively installed on the oil extraction tube 27 on both sides of the oil extraction tube 28. One-way valve 29 and one-way valve 30 are both one-way valves with left inlet and right blockage. A piston 34 is installed inside the oil extraction tube 28. A turntable 31 is installed at the bottom of the oil extraction tube 28. A connecting rod 32 is installed between the turntable 31 and the piston 34. The two ends of the connecting rod 32 are hinged to the hinge seats 33. The hinge seats 33 are fixed to the middle position of the piston 34 and the eccentric position of the turntable 31. A motor 35 is installed at the center of the turntable 31. The output end of the motor 35 is fixedly connected to the turntable 31.
[0035] When supplying lubricating grease, motor 35 can be turned on simultaneously. Motor 35 drives turntable 31 to rotate. Due to the eccentric installation of connecting rod 32 and turntable 31, and the hinge relationship between connecting rod 32 and piston 34, a crank-slider structure is formed, which can drive piston 34 to reciprocate in oil extraction cylinder 28. Due to the setting of two one-way valves, when piston 34 moves down, one-way valve 29 is opened and one-way valve 30 remains closed, which can draw lubricating grease from the middle and upper layers of oil collection box 12 under negative pressure. When piston 34 moves up, one-way valve 29 is closed and one-way valve 30 is opened, pushing the lubricating grease in oil extraction cylinder 28 into oil filter 26 through backflow pipe 25. After being filtered by oil filter 26, it re-enters oil inlet pipe 8 and oil inlet pipe 9 through backflow pipe 23, realizing the effect of lubricating grease reuse.
[0036] In some embodiments, a plug 36 is installed at the bottom opening of the second reflux tube 25, and a magnet 37 is installed on the plug 36 inside the second reflux tube 25.
[0037] Since there is a certain distance between the bottom opening of the oil extraction pipe 27 and the bottom opening of the second reflux pipe 25, the metal shavings in the lubricating grease can settle into the second reflux pipe 25 above the pipe plug 36, reducing the clogging of the oil filter 26 by the metal shavings. At the same time, the magnet 37 can actively attract the metal shavings, making it difficult for the metal shavings to be moved by the lubricating grease.
[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A dual-bearing lubrication circuit, comprising a bearing housing (1), wherein a first bearing (13) and a second bearing (15) are installed within the bearing housing (1), characterized in that, Oil inlet passage 1 (2) and oil inlet passage 2 (3) are respectively provided on the bearing housing (1) at the left side of bearing 1 (13) and the right side of bearing 2 (15). An oil slinger plate (10) is installed between bearing 1 (13) and bearing 2 (15) inside the bearing housing (1). The two sides of the oil slinger plate (10) are fixed against the inner rings of bearing 1 (13) and bearing 2 (15) at the corresponding positions. An oil inlet pipe 1 (8) and an oil inlet pipe 2 (9) are respectively installed on the top of the bearing housing (1) at the positions corresponding to oil inlet passage 1 (2) and oil inlet passage 2 (3). An oil outlet passage (11) is provided at the bottom of the bearing housing (1) at the position corresponding to the position of oil slinger plate (10). An oil collection box (12) is installed at the bottom of the bearing housing (1) at the position corresponding to the position of oil outlet passage (11).
2. The dual-bearing lubrication circuit according to claim 1, characterized in that, A shaft seal cover 4 is provided on the left side of bearing 1 (13) at the position of the ball gap (14) of bearing 1 (13). A connecting ring 5 is installed in the bearing seat (1) at the position of the left side of the oil inlet passage 1 (2). The connecting ring 5 is fixed to the shaft seal cover 4. A shaft seal cover 6 is provided on the right side of bearing 2 (15) at the position of the roller gap (16) of bearing 2 (15). A connecting ring 7 is installed in the bearing seat (1) at the position of the right side of the oil inlet passage 2 (3). The connecting ring 7 is fixed to the shaft seal cover 6.
3. The dual-bearing lubrication circuit according to claim 1, characterized in that, A base ring (17) is fixed inside the oil slinger (10). The width of the base ring (17) is greater than that of the oil slinger (10). The two sides of the base ring (17) abut against the inner rings of bearing 1 (13) and bearing 2 (15) at the corresponding positions. A sealing groove (18) is preset on both sides of the base ring (17). A sealing ring (19) is installed in the sealing groove (18). The sealing ring (19) abuts against the inner ring surfaces of bearing 1 (13) and bearing 2 (15) at the corresponding positions.
4. The dual-bearing lubrication circuit according to claim 3, characterized in that, The sealing groove (18) has multiple equally spaced slots (20) on both sides of the base ring (17). A protrusion (21) is fixed on the sealing ring (19) corresponding to the slot (20). The protrusion (21) is located inside the slot (20). A groove (22) is pre-set in the middle of the outer side of the oil slinger (10).
5. The dual-bearing lubrication circuit according to claim 1, characterized in that, A backflow pipe 1 (23) is provided above the bearing housing (1) near the oil inlet pipe 1 (8) and the oil inlet pipe 2 (9). A branch pipe (24) is fixed on the left end of the backflow pipe 1 (23) facing the oil inlet pipe 1 (8) and the oil inlet pipe 2 (9). The branch pipe (24) is connected to the oil inlet pipe 1 (8) and the oil inlet pipe 2 (9). An oil filter (26) is installed at the bottom right end of the backflow pipe 1 (23). A backflow pipe 2 (25) is connected to the bottom of the oil filter (26). The bottom of the second (25) is connected to an oil extraction pipe (27). The left end of the oil extraction pipe (27) is fixed to the middle of the oil collection box (12). An oil extraction cylinder (28) is connected to the oil extraction pipe (27). One-way valve one (29) and one-way valve two (30) are installed on the oil extraction pipe (27) on both sides of the oil extraction cylinder (28). One-way valve one (29) and one-way valve two (30) are both one-way settings with left inlet and right blockage. A piston (34) is installed inside the oil extraction cylinder (28).
6. The dual-bearing lubrication circuit according to claim 5, characterized in that, The bottom of the oil pump (28) is equipped with a turntable (31), and a connecting rod (32) is installed between the turntable (31) and the piston (34). The two ends of the connecting rod (32) are hinged to each other with a hinge seat (33). The hinge seat (33) is fixed to the middle position of the piston (34) and the eccentric position of the turntable (31). A motor (35) is installed at the center of the turntable (31), and the output end of the motor (35) is fixedly connected to the turntable (31).
7. The dual-bearing lubrication circuit according to claim 5, characterized in that, A pipe plug (36) is installed at the bottom opening of the second reflux pipe (25).
8. A dual-bearing lubrication circuit according to claim 7, characterized in that, A magnet (37) is installed on the plug (36) inside the second reflux tube (25).