Sealing device for speed reducer of electric automobile

Abstract

The utility model discloses an electric automobile speed reducer sealing device which is characterized in that a speed reducer comprises a transmission shaft, a speed reducer shell and a bearing, the transmission shaft is rotationally installed in the speed reducer shell through the bearing, and the end portion of the transmission shaft penetrates through a shell shaft hole and extends to the output end of the speed reducer shell; an oil seal seat hole is formed in the output end of the reducer shell, a framework oil seal is pressed in the oil seal seat hole, a sealing seat hole is formed in the inner wall of a shell shaft hole, and a sealing gear outer circle corresponding to the sealing seat hole is arranged on a transmission shaft and provided with a spiral oil return groove. And an oil seal seat hole and an oil return hole of a bearing space in the speed reducer shell which are communicated with each other are arranged below the shell shaft hole. Through the design that the oil return groove and the framework oil seal are combined, the double-sealing effect is achieved, the sealing reliability is high, the manufacturing cost is low, and the good popularization prospect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive speed reducers, and particularly relates to a sealing device for an electric vehicle speed reducer. Background Art

[0002] The speed reducer is an important component in the electric vehicle assembly system. Its function is to reduce the speed and increase the torque of the power output by the motor and then transmit it to the driving wheels to drive the vehicle. To ensure the internal sealing of the speed reducer and prevent the leakage of the oil inside the speed reducer, oil seal devices are usually provided at the input shaft and output shaft of the speed reducer. The existing oil seal devices usually adopt the method of installing a skeleton oil seal for sealing. If the skeleton oil seal is damaged or excessively worn, the oil inside the speed reducer will leak, causing damage to the internal bearings or gears of the speed reducer.

[0003] At present, oil leakage at the oil seal has become one of the main faults of electric vehicle speed reducers. The main reasons for oil leakage at the oil seal include the material of the oil seal, the selection of the oil seal structure, the installation process of the oil seal, and the internal cleanliness of the speed reducer. Compared with the speed reducer of traditional fuel vehicles, the input speed of the electric vehicle speed reducer is higher. After long-term operation under high-speed and high-temperature conditions, the oil seal is prone to damage, resulting in oil leakage and the entry of dust and other impurities into the speed reducer, ultimately causing damage to the internal bearings and gears of the speed reducer. Some manufacturers adopt the design of double skeleton oil seals at the oil seal, which increases the use cost. In actual use, the first oil seal (inner side) has poor heat dissipation, and the second oil seal (outer side) has poor lubricity, which is prone to early wear and other faults. Summary of the Utility Model

[0004] Aiming at the defects or deficiencies existing in the above-mentioned prior art, the utility model aims to provide an oil seal device for an electric vehicle speed reducer with a simple structure and good sealing effect.

[0005] The purpose of this application is completed through the following technical solutions:

[0006] An electric vehicle speed reducer sealing device, the speed reducer includes a transmission shaft, a speed reducer housing, and a bearing. The transmission shaft is rotatably installed in the speed reducer housing through the bearing, and its end extends through the housing shaft hole to the output end of the speed reducer housing; an oil seal seat hole is provided at the output end of the speed reducer housing, a skeleton oil seal is press-fitted in the oil seal seat hole, a sealing seat hole is provided on the inner wall of the housing shaft hole, a sealing outer circle is provided on the transmission shaft corresponding to the sealing seat hole, a spiral oil return groove is provided on the sealing outer circle, and an oil return hole communicating the oil seal seat hole with the bearing space inside the speed reducer housing is provided below the housing shaft hole.

[0007] Preferably, the cross-section of the spiral oil return groove is trapezoidal.

[0008] Preferably, the number of the spiral oil return grooves is one or two.

[0009] Preferably, the outer circumference of the skeleton oil seal is closely fitted with the reducer housing, and the inner circumference is connected to the outer circle of the oil seal groove on the transmission shaft through a sealing lip.

[0010] Preferably, the oil return hole is an inclined channel with a higher outer side and a lower inner side.

[0011] Preferably, the skeleton oil seal has a hollow structure in the middle.

[0012] Compared with the prior art, the present application has at least the following obvious advantages and effects:

[0013] Through the combined design of the oil return groove and the skeleton oil seal, the present utility model achieves the effect of double sealing, with high sealing reliability and low manufacturing cost, and has good promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a structural cross-sectional view of the present utility model;

[0015] Figure 2 is a partial schematic view of the transmission shaft in the present utility model.

[0016] List of components in this application:

[0017] 1. Transmission shaft; 2. Reducer housing; 3. Bearing; 4. Skeleton oil seal; 5. Housing shaft hole; 6. Oil seal seat hole; 7. Sealing seat hole; 8. Sealing groove outer circle; 9. Spiral oil return groove; 10. Bearing space; 11. Sealing lip; 12. Oil seal groove outer circle; 13. Oil return hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Specific embodiments of the present application are described in conjunction with the accompanying drawings and the following description to teach those skilled in the art how to make and use the best mode of the present application. For the purpose of teaching the principles of the application, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that the variations derived from these embodiments fall within the scope of the present application. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present application. Terms such as "upper", "lower", "left", "right", "middle", and "one" cited in the present application are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model. Thus, the present application is not limited to the specific embodiments described below, but is only defined by the claims and their equivalents.

[0019] As Figures 1 to 2As shown in the figure, this embodiment relates to a sealing device for an electric vehicle reducer. The reducer includes a transmission shaft 1, a reducer housing 2, and a bearing 3. The transmission shaft 1 is rotatably installed in the reducer housing 2 through the bearing 3, and its end extends through the housing shaft hole 5 to the output end of the reducer housing 2. An oil seal seat hole 6 is provided at the output end of the reducer housing 2. A skeleton oil seal 4 is press-fitted in the oil seal seat hole 6. A sealing seat hole 7 is provided on the inner wall of the housing shaft hole 5. A sealing outer circle 8 is provided on the transmission shaft 1 corresponding to the sealing seat 7 hole. A spiral oil return groove 9 is provided on the sealing outer circle 8. A return oil hole 13 communicating the oil seal seat hole 6 and the bearing space 10 inside the reducer housing 2 is provided below the housing shaft hole 5.

[0020] In the embodiment of the present application, the number of the spiral oil return grooves 9 is one, and the cross-section of the spiral oil return groove 9 is trapezoidal.

[0021] In the embodiment of the present application, the outer circumference of the skeleton oil seal 4 is closely fitted with the reducer housing 2, and the inner circumference is connected with the oil seal outer circle 12 on the transmission shaft 1 through a sealing lip 11. The skeleton oil seal 4 has a hollow structure in the middle.

[0022] In order to facilitate the return of the oil, the return oil hole 13 is an inclined channel with a higher terrain on the outside and a lower terrain on the inside.

[0023] When the present utility model is in use, the oil in the reducer housing 2 splashes onto the gears and the bearing 3 inside the reducer housing 2 under the drive of the gears, lubricating and cooling the gears and the bearing 3. The spiral oil return groove 9 on the transmission shaft 1 rotates synchronously with the transmission shaft 1, transmitting the oil back to the inner side of the reducer housing 2. For a small amount of oil that leaks through the gap between the sealing outer circle 8 and the housing shaft hole 5 towards the outside of the reducer housing 2, it is sealed by the skeleton oil seal 4 to prevent oil leakage, and returns to the bearing space 10 on the inner side of the reducer housing 2 through the return oil hole 13.

[0024] Since those skilled in the art can easily think of any modifications, equivalent replacements, improvements, etc. made within the concept and principle of the application, they should all be included within the scope of the claims of the present application.

Claims

1. A sealing device for an electric vehicle reducer, wherein the reducer comprises a transmission shaft, a reducer housing and a bearing, wherein the transmission shaft is rotatably mounted in the reducer housing through the bearing, and an end of the transmission shaft passes through an axial hole of the housing and extends to an output end of the reducer housing; characterized in that: An oil seal seat hole is arranged at the output end of the reducer housing, and a skeleton oil seal for sealing the gap between the housing shaft hole and the outer end of the transmission shaft is press-fitted in the oil seal seat hole, a sealing seat hole is arranged on the inner wall of the housing shaft hole, a sealing block outer circle is arranged on the transmission shaft corresponding to the sealing seat hole, a spiral oil return groove is arranged on the sealing block outer circle, and an oil return hole which is connected to the oil seal seat hole and the bearing space in the reducer housing is arranged below the housing shaft hole.

2. The electric vehicle reducer sealing device according to claim 1, characterized in that: The cross section of the spiral oil return groove is trapezoidal.

3. The electric vehicle reducer sealing device according to claim 1, characterized in that: The number of the spiral oil return grooves is one or two.

4. The electric vehicle reducer sealing device according to claim 1, characterized in that: The skeleton oil seal is tightly matched with the reducer housing on the outer circumference, and is matched and connected with the outer circle of the oil seal stop on the transmission shaft through the sealing lip on the inner circumference.

5. The electric vehicle reducer sealing device according to claim 1, characterized in that: The oil return hole is an inclined channel with a high outer side and a low inner side.

6. The electric vehicle reducer sealing device according to claim 1, characterized in that: The skeleton oil seal is a hollow structure in the middle.

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