Indirect speed reducing device of transmission system of electric automobile

Abstract

The invention discloses an indirect speed reducing device of a transmission system of an electric automobile, comprising a motor, a motor output shaft, a speed reducer, a speed reducer input shaft, a speed reducer output shaft and a drive axle. The indirect speed reducing device is characterized in that a first universal joint is connected between the motor and the speed reducer, and the other end of the speed reducer is connected with the drive axle through a second universal joint. The invention has the characteristic that since the universal joint is arranged between the motor and the speed reducer, the direct connection (hard connection) between the motor and the speed reducer is changed into indirect connection (soft connection), and the purpose of speed reduction is achieved.

Description

Technical field: [0001] The invention relates to an electric vehicle transmission system, in particular to an indirect speed reduction device for the electric vehicle transmission system. Background technique: [0002] In the existing technical field of electric vehicles, when it comes to the deceleration design of the transmission system, the direct connection between the drive motor and the reducer is generally adopted, and the deceleration effect is achieved by reducing the transmission speed of the output shaft. However, this design will bring greater difficulty in the production process, as well as problems such as easy damage, high noise, and high energy consumption during product use. One of the reasons is that in terms of production technology, when the drive motor is directly connected to the reducer, the concentric docking accuracy of the motor and the reducer is too high, and a slight error in the concentricity of the connection will easily increase the friction a...

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Problems solved by technology

However, this design will bring greater difficulty in the production process, as well as problems such as easy damage, high noise, and high energy consumption during product use.

One of the reasons is that in terms of production technology, when the drive motor is directly connected to the reducer, the concentric docking accuracy of the motor and the reducer is too high, and a slight error in the concentricity of the connection will easily increase the friction and friction during operation. Noise; second, during the use of the product, especially in the case of large traction, low motor speed, and increased torque, the concentric connection between the motor and the reducer is more likely to produce elastic deformation of the output shaft, making the product The friction and noise are continuously increased during the operation process; thirdly, this deceleration method makes the end cover of the motor directly connected with the reducer, and when the motor runs at high speed, the reducer will generate a magnetic field, which directly affects the conduction of the motor coil. Pass and interfere with the magnetic field density of the motor, and directly increase the thermal accumulation temperature of the motor, affecting the normal operation efficiency and service life of the motor

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