Gearbox of automatic gear shifting electric vehicle

Abstract

The invention discloses a gearbox of an automatic gear shifting electric vehicle. The gearbox of an electric vehicle comprises a cabinet. The cabinet is internally provided with a main drive motor, a main transmission shaft extending from the main drive motor, and an output shaft parallel to the main transmission shaft. The main transmission shaft and the output shaft are respectively correspondingly provided with gear sets which can mesh, gearshift mechanisms, angle position sensors, and electronic control units. At least a free end of the output shaft is coaxial with a compensation motor. Compared with the prior art, the gearbox of an automatic gear shifting electric vehicle is advantaged in that: 1) multi-gears selection can satisfy requirements of vehicle maximum gradability, maximum speed, and maximum acceleration; 2) and the angle position sensors monitor positions of a gear shift pulling fork in real time, and feed back position signals to the electronic control units, when the gear shift pulling fork separates from a synchronizer, the compensation motor starts up, and startup of the compensation motor ensures no interruption of power in a gear shifting period.

Description

【Technical field】 [0001] The invention belongs to the technical field of vehicle transmission systems, in particular to the technical field of automatic transmissions of vehicle transmission systems, and specifically refers to an automatic transmission for electric vehicles. 【Background technique】 [0002] Pure electric vehicles are a new energy vehicle that can replace traditional internal combustion engine vehicles. At present, most electric vehicle transmissions only have one gear, and the existing one-speed electric vehicles have the following technical disadvantages: [0003] 1) The speed ratio of a gear is difficult to meet the requirements of the car's maximum gradeability, maximum speed and maximum acceleration; [0004] 2) When the car is cruising at high speed (the speed is greater than 100 km / h), the speed of the motor and the gear is close to or exceeds 10,000 revolutions per minute. Such a high speed requires high manufacturing precision of bearings and gears,...

AI Technical Summary

Problems solved by technology

Such a high speed requires high manufacturing precision of bearings and gears, which will greatly increase the production cost;

[0005] 3) When the motor speed is close to 10,000 revolutions per minute, the efficiency and torque are greatly reduced relative to the rated value, while the noise is greatly increased, and the life of the transmission system components is greatly reduced

[0006] Therefore, people began to improve it again, and slowly produced multi-gear electric vehicles. However, this multi-gear electric vehicle has the problems of large motor rotor moment of inertia, poor shift smoothness, and frequent interruption of power when shifting gears.

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