Oil leakage prevention sealing structure of gearbox
By incorporating a double oil-slinging ring and an oil-blocking ring structure in the gearbox, the problem of lubricating oil leakage during high-speed operation of the gearbox is solved, achieving effective lubricating oil return and sealing, and improving the operational stability and lifespan of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-13
- Publication Date
- 2026-04-03
AI Technical Summary
The existing gearbox sealing structure cannot effectively prevent lubricating oil leakage during high-speed operation, resulting in insufficient lubricating oil and equipment contamination.
It adopts a double oil-slinging ring and oil-blocking ring structure, combined with an oil return chamber and an oil return channel. The oil-slinging ring blocks the lubricating oil from leaking out and returns it to the inside of the gearbox, while the oil-blocking ring prevents the lubricating oil from being sprayed directly onto the oil seal.
This minimizes lubricant leakage, ensures sufficient lubricant inside the gearbox, prevents equipment contamination, and improves the gearbox's operational stability and lifespan.
Smart Images
Figure CN121782350A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gearbox sealing technology, specifically a gearbox oil-leakage prevention sealing structure. Background Technology
[0002] As a core power transmission device in industrial fields such as metallurgy, petrochemicals, energy, and environmental protection, the operational stability and sealing performance of gearboxes directly determine the operating efficiency and service life of the entire equipment. Among them, the sealing structure is a key component to ensure that the lubricating oil inside the gearbox does not leak out, while preventing external impurities from entering the transmission system.
[0003] Currently, the existing oil-proof sealing structure often involves setting an oil seal at the connection between the gear shaft and the gearbox. While the oil seal can reduce the leakage of lubricating oil to a certain extent, the sealing capacity of a single oil seal structure is limited. When the gear shaft rotates at high speed, some lubricating oil still leaks out, which not only results in less lubricating medium inside the gearbox but also causes oil pollution to surrounding mechanical equipment. The existing oil seal structure cannot meet the long-term and stable operation requirements of high-speed gearboxes. Summary of the Invention
[0004] To address the shortcomings of existing technologies in preventing lubricating oil leakage during high-speed operation of gearboxes, this invention provides a gearbox oil leak-proof sealing structure that uses two oil-slinging rings to prevent lubricating oil leakage.
[0005] To achieve the above objectives, the specific solution adopted by the present invention is as follows: a gearbox oil leakage prevention sealing structure, including an oil retaining ring, an oil seal, and an oil slinger assembly. The oil retaining ring and the oil seal are both arranged around the circumference of the gear shaft in the gearbox. The oil retaining ring is connected to the bearing used to support the gear shaft, and the oil seal is connected to the gearbox housing. An oil return chamber is formed on the inner wall of the oil seal. The oil return chamber communicates with the inside of the gearbox through an oil return channel. The oil slinger assembly includes a first oil slinger ring and a second oil slinger ring fixedly sleeved on the gear shaft. The first oil slinger ring is located between the oil seal and the oil retaining ring, and the second oil slinger ring is located in the oil return chamber. The outer wall surfaces of the first oil slinger ring and the second oil slinger ring are both set as conical surfaces, and the small ends of the first oil slinger ring and the second oil slinger ring both face the outside of the gearbox.
[0006] As an optimized solution of the above-mentioned gearbox oil leak prevention sealing structure: the oil baffle ring is connected to the end face of the bearing by screws, and a first pad is provided between the oil baffle ring and the end face of the bearing.
[0007] As another optimized solution of the above-mentioned gearbox oil leakage prevention sealing structure: an annular sealing plate is provided at the conical surface of the first oil slinger ring, and a conical hole is opened on the sealing plate. The first oil slinger ring is placed in the conical hole, and a gap is left between the conical surface of the first oil slinger ring and the inner wall of the conical hole.
[0008] As another optimized solution of the above-mentioned gearbox oil leak prevention sealing structure: the sealing plate is connected to the end face of the oil seal, and an adjusting shim is provided between the sealing plate and the end face of the oil seal. The adjusting shim is used to control the distance between the inner wall of the tapered hole and the tapered surface of the first oil slinger ring.
[0009] As another optimized solution for the above-mentioned gearbox oil leak prevention sealing structure: a baffle plate is sleeved on the part of the gear shaft located outside the gearbox, the baffle plate is connected to the oil seal, and a gap is left between the inner wall of the baffle plate and the side wall of the gear shaft.
[0010] As another optimized solution to the above-mentioned gearbox oil leak prevention sealing structure: the baffle plate is connected to the end face of the oil seal by screws, and a second pad is provided between the baffle plate and the end face of the oil seal.
[0011] As another optimized solution for the above-mentioned gearbox oil leak prevention sealing structure: a number of sealing rings are provided on the inner wall of the oil seal, and the sealing rings are arranged around the circumference of the gear shaft.
[0012] As another optimized solution for the above-mentioned gearbox oil leak prevention sealing structure: the number of sealing rings is three, and two of the sealing rings are located between the first oil slinger ring and the second oil slinger ring, and the other sealing ring is located on one side of the conical surface of the second oil slinger ring.
[0013] As another optimized solution for the aforementioned gearbox oil leak prevention sealing structure: the oil return channel is a channel opened inside the oil seal, one end of the oil return channel is connected to the oil return chamber, and the other end of the oil return channel is connected to the inside of the gearbox.
[0014] As another optimized solution for the above-mentioned gearbox oil leak prevention sealing structure: the outer edge of the oil baffle ring is bent to form a bent portion, the bent portion is conical, and the large end of the bent portion faces the end face of the bearing.
[0015] Compared with the prior art, the present invention has the following beneficial effects: By setting a first oil slinger ring and a second oil slinger ring on the gear shaft, with the first oil slinger ring located inside the gearbox and the second oil slinger ring located inside the oil return chamber, the first oil slinger ring can block most of the lubricating oil from entering the oil seal. A small portion of the lubricating oil that does enter the oil seal is blocked by the second oil slinger ring and retained in the oil return chamber. The lubricating oil in the oil return chamber flows back to the gearbox through the oil return channel. Furthermore, an oil baffle ring is set on the end face of the bearing to prevent lubricating oil from being directly sprayed onto the oil seal. The sealing structure of the present invention can minimize lubricating oil leakage. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the sealing structure of the present invention; Figure 2This is a schematic diagram of the structure of the oil slinger ring, oil seal, and sealing plate of the present invention; Figure 3 This is a schematic diagram of the oil baffle ring of the present invention.
[0017] Reference numerals in the attached drawings: 1. Bearing; 2. Oil baffle ring; 3. Gear shaft; 4. Oil seal; 5. Oil return chamber; 6. Sealing ring; 7. First oil slinger ring; 8. Second oil slinger ring; 9. Oil return channel; 10. First pad; 11. Sealing plate; 12. Adjusting shim; 13. Second pad; 14. Wind baffle; 15. Bending section. Detailed Implementation
[0018] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of the present invention should be understood as prior art known or should be known by those skilled in the art.
[0019] like Figures 1 to 3 As shown, the present invention provides a gearbox oil leak-proof sealing structure, including an oil retaining ring 2, an oil seal 4, and an oil slinger assembly. The oil retaining ring 2 and the oil seal 4 are both arranged around the circumference of the gear shaft 3 in the gearbox. The oil retaining ring 2 is connected to the bearing 1 used to support the gear shaft 3, and the oil seal 4 is connected to the gearbox housing. An oil return chamber 5 is provided on the inner wall of the oil seal 4. The oil return chamber 5 communicates with the inside of the gearbox through an oil return channel 9. The oil slinger assembly includes a first oil slinger ring 7 and a second oil slinger ring 8 fixedly sleeved on the gear shaft 3. The first oil slinger ring 7 is located between the oil seal 4 and the oil retaining ring 2, and the second oil slinger ring 8 is located in the oil return chamber 5. The outer wall surfaces of the first oil slinger ring 7 and the second oil slinger ring 8 are both set as conical surfaces, and the small ends of the first oil slinger ring 7 and the second oil slinger ring 8 both face the outside of the gearbox.
[0020] In this embodiment, the oil baffle ring 2 is made of aluminum alloy. The oil baffle ring 2 is arranged around the circumference of the gear shaft 3 in the gearbox, and a gap is reserved between the inner wall of the oil baffle ring 2 and the side wall of the gear shaft 3. This gap is 1.5 to 2 times the clearance of the bearing 1. Oil baffle rings 2 are fixedly connected to both ends of the bearing 1, and the end faces of the oil baffle ring 2 are parallel to the end faces of the bearing 1. An oil seal 4 is arranged around the circumference of the gear shaft 3 in the gearbox. The oil seal 4 is connected to the gearbox housing, and an oil return chamber 5 is formed on the inner wall of the oil seal 4. The oil return chamber 5 communicates with the inside of the gearbox through an oil return channel 9, allowing the lubricating oil entering the oil return chamber 5 to return to the gearbox via the oil return channel 9. The specific structure of the first oil slinger ring 7 and the second oil slinger ring 8 is as follows: the first oil slinger ring 7 is located between the oil seal 4 and the oil baffle ring 2, the second oil slinger ring 8 is located in the oil return chamber 5, the inner walls of the first oil slinger ring 7 and the second oil slinger ring 8 are fixedly connected to the side wall of the gear shaft 3, the outer wall surfaces of the first oil slinger ring 7 and the second oil slinger ring 8 are both set as conical surfaces, and the small ends of the first oil slinger ring 7 and the second oil slinger ring 8 both face the outside of the gearbox.
[0021] The gap between the oil retainer ring 2 and the gear shaft 3 effectively prevents the oil retainer ring 2 from contacting the high-speed rotating gear shaft 3, preventing structural damage to the gear shaft 3. Lubricating oil leaking from the bearing 1 end face first impacts the oil retainer ring 2, thus changing the impact direction of the lubricating oil from the axial direction of the gear shaft 3 to the radial direction, preventing lubricating oil from splashing directly onto the oil seal 4 and reducing the amount of lubricating oil entering the oil seal 4. The first oil slinger ring 7 and the second oil slinger ring 8 can block the flow of lubricating oil along the axial direction of the gear shaft 3. Specifically, when the lubricating oil in the gearbox flows towards the oil seal 4 due to rotational splashing and pressure difference, it encounters the high-speed rotating first oil slinger ring 7. The first oil slinger ring 7 captures this lubricating oil, and under the action of centrifugal force, the lubricating oil adhering to the surface of the first oil slinger ring 7 is thrown outwards radially along the first oil slinger ring 7, thus changing the flow direction of the lubricating oil from the axial direction of the gear shaft 3 to the radial direction. The lubricating oil located on the conical surface of the first oil slinger ring 7 is thrown into the gearbox. Some lubricating oil will inevitably enter the oil seal 4. The second oil slinger ring 8 can trap the lubricating oil in the return oil chamber 5. The second oil slinger ring 8 works on the same principle as the first oil slinger ring 7. The oil baffle ring 2, the first oil slinger ring 7, and the second oil slinger ring 8 can intercept the lubricating oil in multiple stages, thereby minimizing the leakage of lubricating oil.
[0022] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 1As shown, to further reduce the amount of lubricating oil entering the oil seal 4, an annular sealing plate 11 is provided at the conical surface of the first oil slinger ring 7. The sealing plate 11 has a conical hole, into which the first oil slinger ring 7 is inserted, with a gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole. The sealing plate 11 is connected to the end face of the oil seal 4 located inside the gearbox by an internal hexagonal screw, with the small end of the conical hole facing outwards from the gearbox. When the first oil slinger ring 7 rotates at high speed with the gear shaft 3, the gas in the gap between the first oil slinger ring 7 and the conical hole forms a positive pressure area under the action of shearing effect and centrifugal effect, so as to effectively block the lubricating oil. Specifically, the conical surface of the first oil slinger ring 7 rotates at high speed, while the sealing plate 11 remains stationary. The relative movement between the first oil slinger ring 7 and the sealing plate 11 causes the gas in the gap to be subjected to shearing action. The gas layer close to the conical surface of the first oil slinger ring 7 moves in a high-speed circular motion with the first oil slinger ring 7, and under the action of gas viscosity, it drives the overall gas in the gap to move in a circular motion. Since the gap space is restricted in the radial direction of the gear shaft 3, the gas subjected to centrifugal force is distributed in a positive pressure gradient in the radial direction of the gear shaft 3. That is, along the radial direction of the gear shaft 3 from the inside to the outside, the gas pressure in the gap gradually increases, and finally a positive pressure area is formed at the inlet end of the gap. When the lubricating oil in the gearbox approaches the positive pressure area, it will be pushed back into the gearbox by the airflow. The higher the rotational speed of the gear shaft 3, the stronger the shearing and centrifugal effects, the higher the pressure in the positive pressure area, and the better the sealing effect. This structure can effectively prevent lubricating oil from entering the oil seal 4 through the gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole.
[0023] In this embodiment, the gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole is 2.5 to 3 mm. This minimizes the amount of lubricating oil entering the oil seal 4 through the gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole while ensuring safety redundancy.
[0024] To adjust the gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole, an adjusting shim 12 is provided between the sealing plate 11 and the end face of the oil seal 4. The adjusting shim 12 is used to control the distance between the inner wall of the conical hole and the conical surface of the first oil slinger ring 7. The thickness of the adjusting shim 12 can be flexibly selected according to actual needs. When the thickness of the adjusting shim 12 is increased, the gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole decreases; when the thickness of the adjusting shim 12 is decreased, the gap between the conical surface of the first oil slinger ring 7 and the inner wall of the conical hole increases.
[0025] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 1As shown, a baffle plate 14 is fitted onto the portion of the gear shaft 3 located outside the gearbox. The baffle plate 14 is connected to the oil seal 4, and a gap is left between the inner wall of the baffle plate 14 and the side wall of the gear shaft 3. The baffle plate 14 is connected to the end face of the oil seal 4 by an internal hexagon screw. The baffle plate 14 is made of aluminum alloy. The outer end of the gear shaft 3 is connected to the coupling. When the coupling rotates at high speed with the gear shaft 3, a negative pressure zone is formed around the coupling due to the increased air velocity. The air between the oil seal 4 and the coupling flows into this negative pressure zone, easily drawing the lubricating oil from the oil seal 4 to the surface of the gear shaft 3 and causing it to leak out. The baffle plate 14 can effectively block the negative pressure airflow channel between the oil seal 4 and the coupling, blocking the leakage path of the lubricating oil. The gap between the inner wall of the baffle plate 14 and the side wall of the gear shaft 3 is 1.5 to 2 times the clearance of the bearing 1. The gap between the baffle plate 14 and the gear shaft 3 can effectively prevent the baffle plate 14 from contacting the high-speed rotating gear shaft 3, thus preventing structural damage to the gear shaft 3.
[0026] To increase the stability of the sealing structure, a first pad 10 is provided between the oil baffle ring 2 and the end face of the bearing 1, and a second pad 13 is provided between the wind baffle 14 and the end face of the oil seal 4. The first pad 10 and the second pad 13 can buffer the vibration generated when the gearbox is running at high speed.
[0027] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 1 As shown, several sealing rings 6 are provided on the inner wall of the oil seal 4, and the sealing rings 6 are arranged around the periphery of the gear shaft 3. The sealing rings 6 are made of aluminum alloy. The outer wall of the sealing ring 6 is fixed in a groove on the inner wall of the oil seal 4 by sealant. A gap is reserved between the inner wall of the sealing ring 6 and the side wall of the gear shaft 3. The distance of this gap is 1.5 to 2 times the clearance of the bearing 1. There are three sealing rings 6, with two sealing rings 6 located between the first oil slinger ring 7 and the second oil slinger ring 8, and the third sealing ring 6 located on one side of the conical surface of the second oil slinger ring 8. The three sealing rings 6 can further reduce the lubricating oil flowing axially along the gear shaft 3, thereby reducing the external leakage of lubricating oil.
[0028] To facilitate the installation of the sealing structure, the oil baffle ring 2, oil seal 4, sealing ring 6, wind baffle 14, and sealing plate 11 are all set as two ring segments, and the two ring segments can be spliced together along the circumference of the gear shaft 3 to form a complete ring.
[0029] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in: [The following is a more detailed description of the improvement.] Figure 1 , Figure 3As shown, to better collect the lubricating oil to the bottom of the gearbox, the outer edge of the oil baffle ring 2 is bent to form a bend 15. The bend 15 is conical, with its larger end facing the bearing 1. The bend 15 located on the right side of the bearing 1 guides the lubricating oil spray direction to align with the return flow direction of the oil return channel 9, preventing the two streams of lubricating oil from colliding and causing turbulence. The bend 15 located on the left side of the bearing 1 guides the lubricating oil spray direction to one side of the bearing 1, preventing the lubricating oil leaking from the bearing 1 from disturbing the lubricating oil in the transmission gear area inside the gearbox. Through the guiding effect of the bend 15, the lubricating oil leaking from the bearing 1 is confined to the area where the bearing 1 is located, guiding the lubricating oil to quickly collect to the bottom of the gearbox and discharge through the drain pipe, ensuring normal circulation of the lubricating oil.
[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the 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 gearbox oil-leakage-proof sealing structure, characterized in that: The gearbox includes an oil baffle ring (2), an oil seal (4), and an oil slinger assembly. The oil baffle ring (2) and the oil seal (4) are both arranged around the circumference of the gear shaft (3) in the gearbox. The oil baffle ring (2) is connected to the bearing (1) used to support the gear shaft (3). The oil seal (4) is connected to the gearbox housing. The inner wall of the oil seal (4) is provided with an oil return chamber (5). The oil return chamber (5) is connected to the inside of the gearbox through an oil return channel (9). The oil slinger assembly includes a first oil slinger ring (7) and a second oil slinger ring (8) fixedly sleeved on the gear shaft (3). The first oil slinger ring (7) is located between the oil seal (4) and the oil baffle ring (2). The second oil slinger ring (8) is located in the oil return chamber (5). The outer wall surfaces of the first oil slinger ring (7) and the second oil slinger ring (8) are both set as conical surfaces. The small ends of the first oil slinger ring (7) and the second oil slinger ring (8) both face the outside of the gearbox.
2. The gearbox oil leakage prevention sealing structure according to claim 1, characterized in that: The oil baffle ring (2) is connected to the end face of the bearing (1) by screws, and a first pad (10) is provided between the oil baffle ring (2) and the end face of the bearing (1).
3. The gearbox oil leakage prevention sealing structure according to claim 1, characterized in that: The first oil slinger ring (7) has an annular sealing plate (11) on its conical surface. The sealing plate (11) has a conical hole. The first oil slinger ring (7) is placed in the conical hole, and there is a gap between the conical surface of the first oil slinger ring (7) and the inner wall of the conical hole.
4. The gearbox oil leakage prevention sealing structure according to claim 3, characterized in that: The sealing plate (11) is connected to the end face of the oil seal (4), and an adjusting shim (12) is provided between the sealing plate (11) and the end face of the oil seal (4). The adjusting shim (12) is used to control the distance between the inner wall of the tapered hole and the tapered surface of the first oil slinger ring (7).
5. The gearbox oil leakage prevention sealing structure according to claim 1, characterized in that: A baffle plate (14) is fitted on the part of the gear shaft (3) located outside the gearbox. The baffle plate (14) is connected to the oil seal (4), and there is a gap between the inner wall of the baffle plate (14) and the side wall of the gear shaft (3).
6. The gearbox oil leakage prevention sealing structure according to claim 5, characterized in that: The wind deflector (14) is connected to the end face of the oil seal (4) by screws, and a second pad (13) is provided between the end face of the wind deflector (14) and the end face of the oil seal (4).
7. The gearbox oil leakage prevention sealing structure according to claim 1, characterized in that: The inner wall of the oil seal (4) is provided with a plurality of sealing rings (6), and the sealing rings (6) are arranged around the periphery of the gear shaft (3).
8. The gearbox oil leakage prevention sealing structure according to claim 7, characterized in that: The number of sealing rings (6) is three, and two of the sealing rings (6) are located between the first oil slinger ring (7) and the second oil slinger ring (8), and the other sealing ring (6) is located on one side of the conical surface of the second oil slinger ring (8).
9. The gearbox oil leakage prevention sealing structure according to claim 1, characterized in that: The oil return channel (9) is a channel opened inside the oil seal (4). One end of the oil return channel (9) is connected to the oil return chamber (5), and the other end of the oil return channel (9) is connected to the inside of the gearbox.
10. The gearbox oil leakage prevention sealing structure according to claim 1, characterized in that: The outer edge of the oil baffle ring (2) is bent to form a bent portion (15), which is conical, and the large end of the bent portion (15) faces the end face of the bearing (1).