Low-friction bidirectional sealing oil seal for new energy vehicle

Abstract

The utility model relates to a low-friction bidirectional sealing oil seal for a new energy vehicle, which comprises a framework, a rubber body is arranged on the framework, the framework is completely wrapped by the rubber body, a main sealing lip is adhered to the rubber body and comprises a lip body and a lip mouth, the lip body is adhered to the rubber body, and the lip mouth is arranged on the rubber body. A first sealing part, a second sealing part and a third sealing part are sequentially arranged on the lip in the direction from the sealing medium side to the atmosphere side, the first sealing part is a plane with the width being 0.5 mm, and the second sealing part is two concentric annular micro grooves formed in the position close to the sealing medium side. And the third sealing part is provided with a plurality of spiral micro grooves which are formed in the position close to the atmosphere side. By the adoption of the technical scheme, friction between the oil seal and the shaft can be effectively reduced, the service life of the oil seal and the shaft is prolonged, and the sealing performance of the oil seal can be effectively improved when the shaft rotates forwards or reversely at a high speed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, and in particular to a low-friction bidirectional sealing oil seal for new energy vehicles. Background Art

[0002] Pure electric vehicles among new energy vehicles have much less impact on the environment than traditional vehicles, so their prospects are widely optimistic. As a reducer used in conjunction with the drive motor, it has also received attention from major traditional car companies as pure electric vehicles become popular.

[0003] The current electric drive axle is driven by a drive motor, and the power is transmitted to the bridge after being decelerated by a reducer. The position where the reducer is connected to the motor is called the reducer input shaft. An oil seal is required here to seal the lubricating oil in the reducer. The input shaft is directly connected to the motor. The maximum forward speed here can reach 15,000 rpm or even 20,000 rpm, and the reverse speed can also reach 3,000 to 4,000 rpm. Under the use conditions here, the current rubber oil seal can basically meet the general use requirements, but there is still a defect of insufficient wear resistance. At present, the main engine manufacturers and users have higher and higher requirements for the reliability and life of the whole vehicle, and the requirements for the life of the oil seal are also getting higher and higher. It is even more necessary to further improve the wear resistance and sealing reliability of the oil seal.

[0004] The side of the sealing oil seal facing the outside is the atmosphere side, and the other side is the sealing medium side. Summary of the invention

[0005] The utility model aims to provide a low-friction bidirectional sealing oil seal for new energy vehicles, aiming to solve the problems of insufficient wear resistance and sealing performance of existing oil seals.

[0006] The technical solution adopted by the utility model is: a low-friction bidirectional sealing oil seal for new energy vehicles, including a skeleton, a rubber body is arranged on the skeleton, the rubber body completely wraps the skeleton, a main sealing lip is bonded to the rubber body, the main sealing lip includes a lip body and a lip mouth, the lip body and the rubber body are bonded together, and a first sealing part, a second sealing part and a third sealing part are sequentially arranged on the lip mouth in the direction from the sealing medium side to the atmosphere side, the first sealing part is a plane with a width of 0.5 mm, the second sealing part is two concentric annular micro grooves arranged at a position close to the sealing medium side, and the third sealing part is a plurality of micro grooves arranged at a position close to the atmosphere side, which are spiral micro grooves.

[0007] A further technical solution of the utility model is that a secondary sealing lip is arranged on the rubber body, and the secondary sealing lip is matched with the input shaft in a clearance, so as to reduce the clamping force of the oil seal assembly on the shaft, thereby achieving a longer-term sealing effect.

[0008] A further technical solution of the utility model is that a plurality of through holes are arranged on the frame, and the circumference of the through holes is evenly distributed on the frame, so as to ensure the reliability of the bonding of the main sealing lip.

[0009] A further technical solution of the utility model is that the main sealing lip is made of polytetrafluoroethylene material. The main sealing lip made of polytetrafluoroethylene material has a small friction coefficient and can effectively reduce the friction between the main sealing lip and the shaft.

[0010] The beneficial effect of the utility model is that due to the adoption of the above technical scheme, the low-friction bidirectional sealing oil seal for new energy vehicles of the utility model can effectively reduce the friction between the oil seal and the shaft, increase the service life of the oil seal and the shaft, and effectively improve the sealing performance of the oil seal when the shaft rotates forward or reverse at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural schematic diagram of a low-friction bidirectional sealing oil seal for new energy vehicles described in the utility model;

[0012] Figure 2 It is a structural schematic diagram of the skeleton of the utility model;

[0013] Figure 3 It is a schematic diagram of the structure when the lip is in contact with the shaft. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0015] Example:

[0016] like Figures 1 to 3 A low-friction bidirectional sealing oil seal for new energy vehicles is shown, a low-friction bidirectional sealing oil seal for new energy vehicles, including a skeleton 1, a rubber body 2 is arranged on the skeleton, the rubber body completely wraps the skeleton, a main sealing lip 3 is bonded to the rubber body, the main sealing lip includes a lip body 32 and a lip opening 31, the lip body and the rubber body are bonded together, and a first sealing part 311, a second sealing part 312 and a third sealing part 313 are sequentially arranged on the lip opening in the direction from the sealing medium side to the atmosphere side, the first sealing part is a plane with a width of 0.5 mm, the second sealing part is two concentric annular micro grooves arranged at a position close to the sealing medium side 4, and the third sealing part is a plurality of micro grooves arranged at a position close to the atmosphere side 5, which are spiral micro grooves.

[0017] Furthermore, the rubber body is provided with a secondary sealing lip 21, which is clearance-matched with the input shaft to reduce the clamping force of the oil seal assembly on the shaft 6, thereby achieving a longer-term sealing effect.

[0018] Furthermore, a plurality of through holes 11 are arranged on the frame, and the circumference of the through holes is evenly distributed on the frame, so as to ensure the reliability of the bonding of the main sealing lip.

[0019] Furthermore, the main sealing lip is made of polytetrafluoroethylene material.

[0020] illustrate:

[0021] The part where the main sealing lip contacts the rotating shaft of the driving motor is called the working surface. The working surface is divided into the first sealing part, the second sealing part and the third sealing part, wherein the first sealing part is a plane that retains the original state of the polytetrafluoroethylene sheet within a range of about 0.5mm (the best is 0.5mm) close to the sealing medium side of the main sealing lip, and the second sealing part and the third sealing part on this working surface have multiple micro grooves. These multiple micro grooves are not completely the same structural form, and different structural forms are adopted according to the different contact parts between the main sealing lip and the shaft 6. That is, the second sealing part is a micro groove of two concentric rings. This type of structural form can achieve sealing at a lower speed, and is used to achieve sealing when the oil seal is at low speed and in reverse. When the speed increases, the plane structure of the first sealing part and the micro grooves of the two concentric rings of the second sealing part can no longer achieve sealing, and the sealing medium on the sealing medium side will leak to the atmosphere side.

[0022] The third sealing part is a dozen micro grooves on the main sealing lip close to the atmosphere side, which adopts a spiral structure. When the sealing medium that has passed the micro grooves of the concentric rings of the second sealing part reaches here, the 5 to 6 spiral micro grooves close to the shaft 6 play a pumping role, throwing the leaked sealing medium back to the sealing medium side, thereby achieving sealing under high-speed conditions.

[0023] The structural form of the main sealing lip design can reduce the thickness of the main sealing lip, further reduce the clamping force of the rubber body on the shaft, thereby reducing the friction between the rubber body and the shaft, and extending the service life of the new energy vehicle shaft.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-friction bidirectional sealing oil seal for new energy vehicles, characterized in that: It includes a skeleton, on which a rubber body is arranged, which completely wraps the skeleton, a main sealing lip is bonded to the rubber body, the main sealing lip includes a lip body and a lip opening, the lip body and the rubber body are bonded together, and a first sealing part, a second sealing part and a third sealing part are sequentially arranged on the lip opening in the direction from the sealing medium side to the atmosphere side, the first sealing part is a plane with a width of 0.5 mm, the second sealing part is two concentric annular micro grooves arranged at a position close to the sealing medium side, and the third sealing part is a plurality of micro grooves arranged at a position close to the atmosphere side, which are spiral micro grooves.

2. A low-friction bidirectional sealing oil seal for new energy vehicles according to claim 1, characterized in that: The rubber body is provided with a secondary sealing lip, which is clearance-matched with the input shaft.

3. The low-friction bidirectional sealing oil seal for new energy vehicles according to claim 1 is characterized in that: The frame is provided with a plurality of through holes, and the circumference of the through holes is evenly distributed on the frame.

4. The low-friction bidirectional sealing oil seal for new energy vehicles according to claim 1 is characterized in that: The main sealing lip is made of polytetrafluoroethylene material.

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