Electric automobile transmission and speed change method

Abstract

The invention discloses an electric automobile transmission and a speed change method of the electric automobile transmission. The electric automobile transmission comprises a hydraulic torque converter with the locking function, a planet gear mechanism, an oil pump, an oil pump motor, a controller, a speed reducing mechanism and a differential mechanism. The hydraulic torque converter with the locking function comprises a pump impeller, a turbine, an input shaft, an output shaft and other components. A driving motor is connected with the pump impeller through the input shaft, and the turbine is connected with the output shaft. The torque of the output shaft is transmitted to the planet gear mechanism. The planet gear mechanism comprises a sun gear, a planet carrier, a big gear ring, a clutch, a brake and other components. Torque is output from the planet carrier through the planet gear mechanism and drives an automobile to run after passing through the speed reducing mechanism and the differential mechanism. The transmission can have two mechanical transmission gears and one hydraulic torque conversion gear. The oil pump is used for providing pressure for a hydraulic system of the transmission. Due to the electric automobile transmission, the climbing performance and the acceleration performance of the electric automobile can be improved, and the reliability of the automobile can be enhanced.

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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