Electric power stepless speed changer integrated with double speed ratio output mechanism

Abstract

The invention relates to an electric stepless speed changer which is provided with a double speed ratio output mechanism, which comprises a double-rotor motor (25) and a double gear ratio output mechanism (9), wherein the double gear ratio output mechanism (9) is arranged between the double-rotor motor (25) and a vehicle drive axle (26), the input shaft and the output shaft namely an outer rotor (3) of the double-rotor motor (25) are connected, and the output shaft and the input shaft of the vehicle drive axle (26) are connected. The invention is characterized in that two velocity ratios exist between the input shaft and the output shaft. And the velocity ratio is one and only at any time, and a double-rotor motor which is connected with the electric stepless speed changer can drive vehicles through two different speeds.

Description

technical field [0001] The invention relates to an electric continuously variable transmission based on a double rotor motor, in particular to an electric continuously variable transmission integrated with a dual-speed ratio output mechanism used in the driving occasion of a deep hybrid vehicle. Background technique [0002] A dual-rotor motor is a new type of motor with two rotors that can rotate independently. When the two rotors of this electric machine are connected to the engine output shaft and the vehicle drive shaft, respectively, this new electric machine can be regarded as a new type of transmission. Since the speed and torque of the two rotors are driven and controlled by electricity, and the proportional relationship between them is continuously adjustable, the speed change device composed of the double rotor motor is called electric stepless transmission. This transmission has distinct advantages over existing transmissions based on mechanical or hydraulic tec...

AI Technical Summary

Problems solved by technology

[0003] However, on the other hand, transmissions that rely on electricity to change gears have certain limitations compared with mechanical or hydraulic transmissions.

First of all, the reliability of pure mechanical or hydraulic mechanism is the highest, and the reliability of electrical system is relatively low

Second, the electrical system is not suitable for large speed ratio transmission, and the mechanical gearbox has great advantages in this regard

However, there are three prominent problems in this scheme

The first problem is: the output shaft of the electric continuously variable transmission is no longer the outer rotor shaft, but an output shaft parallel to it

This structure makes the volume and weight of the improved electric continuously variable transmission involved in this patent relatively large, and will cause the vehicle to have a small ground clearance and poor passability

The second problem is that the input shaft of this modified electric continuously variable transmission is rigidly connected with the engine

Make motor control very difficult

The third problem is that there are separate clutches and lockups

Further increases the weight and volume of the system

In addition to the above problems, the more important thing is that this improved electric continuously variable transmission only improves the reliability of the system, and does not solve the problem that the electric continuously variable transmission is not suitable for large speed ratio occasions

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