Novel power device for driving double-motor multi-mode electric automobile and automobile

Abstract

The invention relates to a driving transmission system of an electric automobile, in particular to a novel power device for driving a double-motor multi-mode electric automobile. The novel power device comprises a main motor, a planetary differential gear train, an auxiliary motor, a synchronizer, a rotating speed coupling gear, a torque coupling gear and a gear shifting execution mechanism, the main motor comprises a main motor shaft; the planetary differential gear train comprises a sun gear, a planet gear, a planet gear shaft, a planet carrier and a gear ring; the sun gear is fixed on a main motor shaft; the planet carrier is used for outputting power; the auxiliary motor comprises an auxiliary motor shaft, the synchronizer is fixed to the auxiliary motor shaft, the rotating speed coupling gear and the torque coupling gear are arranged at the two sides of the synchronizer respectively, the rotating speed coupling gear is meshed with the gear ring, and the torque coupling gear is meshed with the planet carrier. Combination of the synchronizer and the rotating speed coupling gear or the torque coupling gear can be achieved through the gear shifting executing mechanism. On the premise that the structure is compact, large torque can be provided, and high-efficiency operation within a wide speed range can be achieved.

Description

technical field [0001] The invention relates to a drive transmission system of an electric vehicle, in particular to a novel power device for driving a double-motor multi-mode electric vehicle and the vehicle. Background technique [0002] Today, the key problem that plagues the development of pure electric vehicles "how to further increase the mileage of the vehicle" still exists. In addition to relying on battery technology (increasing battery power density and energy density), the driving range is also closely related to the configuration, parameter matching and control method of the drive system. Therefore, a high-efficiency transmission system is an important research direction to improve the driving range and comprehensive performance of pure electric vehicles. [0003] At present, the power transmission system used for pure electric vehicles is mainly composed of a single motor and a reducer. It has the characteristics of simple structure, easy control and mature tec...

AI Technical Summary

Problems solved by technology

[0005] (1) In order to meet the needs of automotive power systems under different working conditions, the drive system needs to have high torque at low speeds, high torque at high speeds, high power output performance at high speeds, and a wide speed range and output torque Range, traditional pure electric vehicles are usually driven by a single motor, it is difficult to meet these requirements at the same time

[0006] (2) Traditional pure electric vehicles generally do not use transmissions, and the transmission ratio is not variable

Because there is no matching transmission device, the driving performance of the vehicle depends entirely on the working characteristics of the motor, which causes contradictions between the maximum speed that the vehicle can achieve and the acceleration and climbing performance, making it difficult for the motor to work in the high-efficiency area for a long time. Drive efficiency and overall performance put forward higher requirements, which increases the cost of the motor and limits the reliability, power and economy of the structure

[0007] (3) Although the configuration of pure electric vehicles using planetary gear mechanism for power coupling has good technical advantages, most of the existing configurations cannot realize speed coupling and torque coupling at the same time, and the dual motors cannot work independently; some Although the configuration can realize these working modes, the structure is too complicated, and it is extremely difficult to control and manufacture

For example, in the new generation of Toyota Prius, the generator will be used as an electric motor to provide output in some occasions, which is equivalent to three power sources. However, since the coupling mechanism of the Prius uses the ring gear as the output, if there are only two power sources Under the premise of the source, it cannot realize the working mode of speed coupling and torque coupling at the same time

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