High-rotating-speed self-lubricating oil seal of electric drive axle
By introducing a self-lubricating structure with a support skeleton and a self-lubricating layer into the oil seal of the electric drive axle, the problems of lip wear and metal impurity scratches on the oil seal at high speeds are solved, achieving higher sealing reliability and service life.
Patent Information
- Application Number
- CN202520745225.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-19
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-19
AI Technical Summary
Existing electric drive axle oil seals are prone to lip erosion, large wear width, increased lip friction temperature and lubricating oil leakage at high speeds, and are also easily scratched by metal impurities, resulting in poor sealing stability.
A self-lubricating oil seal structure including a support skeleton and a self-lubricating layer was designed. Through the interference fit between the support skeleton and the self-lubricating layer, the self-lubricating layer absorbs lubricating oil, prevents dry friction of the main lip, blocks metal impurities, and improves sealing performance.
It effectively prevents the main lip from dry-grinding and being scratched by metal shavings, extends the service life of the oil seal, improves sealing stability, and prevents lubricating oil leakage.
Smart Images
Figure CN223895022U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of sealing components for electric drive axles in new energy vehicles, and in particular to high-speed self-lubricating oil seals for electric drive axles. Background Technology
[0002] With the development of new energy passenger vehicles, the electrification of commercial vehicles is also progressing steadily. The most critical component in the electrification of commercial vehicles is the electric drive axle. In the field of electric drive axles, a high-speed oil seal is required at the connection between the motor and the axle body. This oil seal's function is to prevent leakage of lubricating oil inside the electric drive axle. Compared to traditional axles, the biggest change in electric drive axles is the increased input speed. Currently, the common maximum speed range is 12,000-16,000 rpm. At such high speeds, conventional oil seal structures can no longer meet the requirements, frequently resulting in abnormalities such as lip burning, large wear width, and increased lip friction temperature.
[0003] Existing oil seals, based on conventional oil seals, have optimized and adjusted the lip area, resulting in a significant reduction in the clamping force of the oil seal lip. However, electric drive axles use high-viscosity lubricating oil, and the lower clamping force is insufficient to resist the hydrodynamic pressure effect of the lubricating oil, leading to short-term lubrication leakage. Furthermore, high-speed oil seals in electric drive axles, under high speeds and insufficient lip lubrication, quickly experience lip dry friction and abnormal burning, ultimately resulting in poor sealing stability. Moreover, electric drive axles used in light trucks frequently experience overload. During gear meshing, the gears inside the axle experience significant forces, generating fine metallic impurities. If these impurities enter the oil seal lip, they can directly cause lip scratches and leakage. Utility Model Content
[0004] Technical objective: In order to overcome the shortcomings of the existing technology, this utility model provides a high-speed self-lubricating oil seal for electric drive axles to prevent dry friction due to lack of oil in the main lip and scratches by metal debris.
[0005] Technical solution: To achieve the above objectives, the present invention discloses a high-speed self-lubricating oil seal for an electric drive axle, comprising an oil seal body and a self-lubricating structural oil seal. The self-lubricating structural oil seal comprises an interconnected support skeleton oil seal and a self-lubricating layer oil seal. The self-lubricating layer oil seal can absorb lubricating oil. The oil seal body is nested outside the support skeleton oil seal, and the two are interference-fitted.
[0006] Furthermore, the self-lubricating layer oil seal is connected to the inner surface of the supporting skeleton oil seal, and the end of the self-lubricating layer oil seal is interference-fitted with the input shaft oil seal.
[0007] Furthermore, the supporting skeleton oil seal and the self-lubricating layer oil seal are bonded together by rubber or adhesive.
[0008] Furthermore, the supporting frame oil seal is a steel structure.
[0009] Furthermore, the self-lubricating oil seal is made of non-woven fabric.
[0010] Furthermore, the oil seal body includes a main skeleton oil seal, a sealing body oil seal covering the main skeleton oil seal, and a spring oil seal disposed on the sealing body oil seal. The end of the sealing body oil seal is provided with a main lip oil seal, and the main lip oil seal is interference-fitted with the input shaft oil seal.
[0011] Furthermore, the support skeleton oil seal is arranged in the opposite direction to the main skeleton oil seal.
[0012] Furthermore, a small amount of lubricating oil is added between the main lip oil seal and the self-lubricating layer oil seal.
[0013] Furthermore, the end of the self-lubricating layer oil seal that contacts the input shaft oil seal can be bent toward the main lip oil seal or away from the main lip oil seal.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. The self-lubricating oil seal of this utility model has a self-lubricating structure. The self-lubricating layer with the function of absorbing lubricating oil is connected by a support skeleton. When there is a short-term lack of lubrication in the main lip of the oil seal, the self-lubricating layer will absorb the lubricating oil between the main lip and the self-lubricating layer onto the shaft surface through its own pores, so as to prevent dry friction of the main lip and extend the service life of the oil seal.
[0016] 2. When metal debris is generated in the electric drive bridge cavity due to gear meshing, the metal impurities reach the surface of the self-lubricating layer and are blocked in the electric drive bridge cavity, preventing them from reaching the main lip of the oil seal, thus preventing scratches on the main lip and further improving the sealing life of the oil seal. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the cross-section of the self-lubricating oil seal in an embodiment of this utility model;
[0018] Figure 2 This is a schematic diagram of the cross-section of the self-lubricating oil seal in another embodiment of the present invention.
[0019] In the diagram, 10 is the oil seal body; 11 is the main frame; 12 is the sealing body; 13 is the main lip; 14 is the spring; 20 is the self-lubricating structure; 21 is the support frame; 22 is the self-lubricating layer; and 30 is the input shaft. Detailed Implementation
[0020] The following is in conjunction with the appendix Figures 1-2The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.
[0021] A high-speed self-lubricating oil seal for an electric drive axle is disclosed in this embodiment. Specifically, the seal is installed on the input shaft 30 connecting the motor and the axle body in a new energy vehicle. The self-lubricating oil seal comprises an oil seal body 10 and a self-lubricating structure 20, which is nested within the oil seal body 10 with an interference fit.
[0022] The oil seal body 10 includes a main frame 11, a sealing body 12, and a spring 14. The main frame 11 has an "L" shaped cross-section. The sealing body 12 covers the main frame 11. A main lip 13 is provided at the end of the sealing body 12. The spring 14 is provided on the sealing body 12 near the main lip 13. The main lip 13 is interference-fitted with the input shaft 30.
[0023] The self-lubricating structure 20 includes an interconnected support frame 21 and a self-lubricating layer 22. The self-lubricating layer 22 can absorb lubricating oil. The oil seal body 10 is nested on the outside of the support frame 21, and the two are interference-fitted. The support frame 21 is a steel structure, and the self-lubricating layer 22 can be made of a material with lubricating oil absorption function, such as non-woven materials like non-woven fabric. The structure of the support frame 21 can be flexibly configured. In a specific embodiment, the cross-section of the support frame 21 is also an "L"-shaped structure. The two L-shaped structures of the support frame 21 and the main frame 11 are arranged in opposite directions. The self-lubricating layer 22 is connected to the inner surface of the short side of the support frame 21. The support frame 21 and the self-lubricating layer 22 are bonded together by rubber or adhesive. The end of the self-lubricating layer 22 is interference-fitted with the input shaft 30. Specifically, the L-shaped structure of the main frame 11 is placed upright, and the support frame 21 is placed in reverse within the space enclosed by the main frame 11 and the input shaft 30. The oil seal body 10 is located on the motor side, and the self-lubricating structure 20 is located on the bridge body side. The end of the self-lubricating layer 22 that contacts the input shaft 30 can be bent toward the main lip 13 or away from the main lip 13.
[0024] With the self-lubricating structure 20 of this invention, a certain amount of lubricating oil is pre-added between the main lip 13 and the self-lubricating layer 22 during the initial installation of the oil seal. When the main lip 13 experiences short-term insufficient lubrication, the self-lubricating layer 22 will absorb the lubricating oil between the main lip 13 and the self-lubricating layer 22 onto the shaft surface through its own pores, preventing dry friction of the main lip 13. In addition, in light trucks or heavy trucks, slight metal impurities are generated during the meshing of the gears in the axle. These metal fragments in the axle will be mixed in with the lubricating oil and directly impact the main lip of the oil seal. At this time, the main lip is easily scratched by foreign objects, leading to oil seal leakage. With the self-lubricating structure 20, after the metal impurities reach the surface of the self-lubricating layer 22, they are blocked in the electric drive axle cavity and cannot reach the main lip of the oil seal, thereby preventing the main lip 13 from being scratched and improving the sealing life of the oil seal.
[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A high-speed self-lubricating oil seal for an electric drive axle, characterized in that, It includes an oil seal body (10) and a self-lubricating structure (20). The self-lubricating structure (20) includes a support frame (21) and a self-lubricating layer (22) that are connected to each other. The self-lubricating layer (22) can absorb lubricating oil. The oil seal body (10) is nested on the outside of the support frame (21), and the two are interference fit.
2. The high-speed self-lubricating oil seal for electric drive axles according to claim 1, characterized in that, The self-lubricating layer (22) is connected to the inner surface of the support frame (21), and the end of the self-lubricating layer (22) is interference-fitted with the input shaft (30).
3. The high-speed self-lubricating oil seal for electric drive axles according to claim 2, characterized in that, The supporting frame (21) and the self-lubricating layer (22) are bonded together by rubber or adhesive.
4. The high-speed self-lubricating oil seal for electric drive axles according to claim 3, characterized in that, The supporting frame (21) is a steel structure.
5. The high-speed self-lubricating oil seal for electric drive axles according to claim 4, characterized in that, The self-lubricating layer (22) is a non-woven fabric.
6. The high-speed self-lubricating oil seal for electric drive axles according to any one of claims 2 to 5, characterized in that, The oil seal body (10) includes a main skeleton (11), a sealing body (12) covering the main skeleton (11), and a spring (14) disposed on the sealing body (12). The sealing body (12) has a main lip (13) at its end, and the main lip (13) is interference-fitted with the input shaft (30).
7. The high-speed self-lubricating oil seal for electric drive axles according to claim 6, characterized in that, The supporting frame (21) is arranged in the opposite direction to the main frame (11).
8. The high-speed self-lubricating oil seal for electric drive axles according to claim 6, characterized in that, A small amount of lubricating oil is added between the main lip (13) and the self-lubricating layer (22).
9. The high-speed self-lubricating oil seal for electric drive axles according to claim 6, characterized in that, The end of the self-lubricating layer (22) that contacts the input shaft (30) can be bent toward the main lip (13) or away from the main lip (13).