A kind of electric vehicle transmission and transmission method

Abstract

The invention discloses an electric vehicle transmission and a speed changing method thereof, comprising a hydraulic torque converter with a locking function, a planetary gear mechanism, an oil pump, an oil pump motor, a controller, a speed reduction mechanism and a differential. The hydraulic torque converter with lock-up function includes a pump wheel, a turbine, an input shaft, an output shaft, etc., the drive motor is connected to the pump wheel through the input shaft, and the turbine is connected to the output shaft. The torque on the output shaft is transmitted to the planetary gear mechanism. The planetary gear mechanism includes sun gear, planet carrier, large ring gear, clutch, brake and other parts. The torque is output from the planet carrier through the planetary gear mechanism, and drives the vehicle to travel after passing through the reduction mechanism and the differential. The transmission can realize two mechanical transmission gears and one hydraulic torque conversion gear. The oil pump is used to provide pressure to the transmission hydraulic system. The electric vehicle transmission of the invention can improve the climbing performance and acceleration performance of the electric vehicle, and at the same time enhance the reliability of the vehicle.

Description

technical field [0001] The invention relates to an automobile transmission and a speed changing method, in particular to a transmission and a speed changing method suitable for pure electric vehicles. Background technique [0002] The development of energy-saving and new energy vehicles has become an inevitable choice for my country's energy strategy. The current focus is to promote the industrialization of pure electric vehicles and plug-in hybrid vehicles, popularize non-plug-in hybrid vehicles and energy-saving internal combustion engine vehicles, and upgrade my country's automobile industry. overall technical level. [0003] At present, there are mainly the following schemes for the speed change of electric vehicles. The first option is to use a fixed reduction ratio; the second option is to use a two-speed transmission; the third option is to use the transmission of a traditional fuel vehicle for speed change. Because the motor itself has the characteristics of high ef...

AI Technical Summary

Problems solved by technology

[0006] The deficiencies of this electric vehicle transmission mainly include the following two points: first, the motor rotor speed changes greatly when shifting gears, and the moment of inertia of the rotor also changes greatly, resulting in greater wear and tear on the friction plates of the brake and clutch; second, starting When the motor is working in a stalled state, it is easy to cause the motor to be burned

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