High-speed pure-electric-vehicle planet-gear variable speed transmission system

Abstract

The invention discloses a high-speed pure-electric-vehicle planet-gear variable speed transmission system. The high-speed pure-electric-vehicle planet-gear variable speed transmission system mainly comprises a high-speed-transmission variable speed mechanism and a traditional vehicle variable speed mechanism. A high-speed area is added to the front portion of a traditional vehicle transmission, aset of planet high-speed reduction gears are added to the front portion of a first shaft, and are used for adjusting the rotating speed of a high-speed driving motor to the low rotating speed capableof being adapted by the traditional vehicle variable speed mechanism, and a common fourth-gear mechanical automatic transmission is still arranged at the back portion of the first shaft. An independent shell, an independent bearing, independent lubrication and independent sealing are adopted in the high-speed area. In the high-speed pure-electric-vehicle planet-gear variable speed transmission system, the speed ratio of a high-speed gear pair is a constant speed ratio between 3 to 5, the rotating speed of 5,000 rpm to 17,500 rpm of the high-rotating-speed driving motor can be reduced to be within 3,500 rpm, and the high-speed pure-electric-vehicle planet-gear variable speed transmission system adapts to design, the technology, production and maintenance and repairing of the traditional vehicle transmission.

Description

technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a planetary gear transmission system of a high-speed pure electric automobile. Background technique [0002] The drive system of pure electric vehicles mainly includes single-motor centralized drive and multi-motor distributed drive. Foreign pure electric vehicle solutions mostly focus on single-stage deceleration, which fully realizes the speed regulation function requirements through the motor, and covers the power requirements of the whole vehicle under all working conditions through the low-speed constant torque and high-speed constant power characteristics of the motor. However, due to the gap in the manufacturing technology of domestic motors, it is difficult to reach a maximum speed of more than 10,000 rpm, which limits the power level of pure electric vehicles and puts forward higher requirements for the high-efficiency range of the motor. Therefore, a si...

AI Technical Summary

Problems solved by technology

Since the input speed of the traditional commercial vehicle transmission system is mostly within 5000rpm, and the medium and heavy commercial vehicles are mostly within 3500rpm, while the speed of the high-efficiency pure electric vehicle drive motor can be as high as 15000 to 20000rpm, or even higher. It can be seen that the traditional commercial vehicle transmission The system cannot adapt to high-efficiency drive motors with high speeds below 5000rpm. The drive motor is driven by a 2 to 4-speed mechanical automatic transmission. High-speed and high-efficiency drive motors have not yet been used in batches in China.

[0004] Since the current pure electric commercial vehicles do not have a transmission system that can give full play to the advantages of the small torque, high speed, high power density, and high efficiency of the drive motor, the current electric commercial vehicles have high power consumption and high operating costs. Insufficient mileage, at the same time, the size and weight of the driving motor are large, the layout is difficult, and the cost of the motor is high

[0005] The existing solution to the above problems is to design a high-speed gearbox that can match the high-speed output motor. However, compared with ordinary gearboxes, the cost of high-speed gearboxes is increased, the space is small, the design is difficult, and high precision is required.

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