Power-interrupting-free shifting speed changing box of electric vehicle and shifting control method of power-interrupting-free shifting speed changing box

Abstract

The invention discloses a power-interrupting-free shifting speed changing box of an electric vehicle and a shifting control method of the power-interrupting-free shifting speed changing box. The speed changing box comprises a first gear pair mechanism, a second gear pair mechanism, a disc clutch and a shifting control mechanism, in the shifting control mechanism, a first gear overrunning clutch and a control overrunning clutch are mounted in corresponding gears, a control friction plate is fixed on a roller retainer and a roller shifting fork of the first gear overrunning clutch, a wave spring is mounted in an annular groove in an end surface of a second control gear, and a control pressure plate is axially pre-tightened through the wave spring, is clamped in the annular groove in the end surface of the second control gear and rotates along with the second control gear. By the shifting control method of the speed changing box, first gear engaging, second gear engaging and gear reversing actions can be realized and do not intervene. By the power-interrupting-free shifting speed changing box of the electric vehicle, the problem of interrupting of shifting power of the traditional AMT is solved, and a smooth speed ratio switching process can be realized. In addition, by the structure, a shifting fork and a shifting fork shaft are further omitted, the system structure is greatly simplified, and the total weight of a transmission is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle transmission, and in particular relates to an electric vehicle non-power interruption shift gearbox and a shift control method thereof. Background technique [0002] How to reduce dependence on oil is an important direction for the development of the modern automobile industry. In the past two years, my country's pure electric vehicles have developed rapidly. Many companies have launched pure electric vehicles on the market, and pure electric vehicles have entered industrialization. [0003] There are many kinds of driving mechanisms for pure electric vehicles, such as the non-gear motor direct drive scheme, that is, the motor directly drives the wheels through a fixed speed ratio reduction device. This transmission mode has good smoothness, but it has high performance requirements for the motor battery. Vehicle dynamics are poor. The transmission scheme of motor plus gearbox greatly re...

AI Technical Summary

Problems solved by technology

The electromechanical automatic transmission AMT has the advantage of high transmission efficiency, but the traditional electromechanical automatic transmission has power interruption during the shift process, which affects the ride comfort of the vehicle

In addition, the operating mechanism of the traditional mechanical automatic transmission includes shift forks and shift fork shafts, which increases the size of the transmission and increases the cost

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