Drive switching and transmission variable speed system of hollow motor type electric vehicle

Abstract

The invention discloses a drive switching and transmission variable speed system of a hollow motor type electric vehicle. The drive switching and transmission variable speed system of the hollow motor type electric vehicle comprises a hollow motor and a transmission, wherein the transmission comprises a variable speed drive component and a front output shaft, the front output shaft is penetrated through a hollow power shaft and can rotate relatively; the drive switching and transmission variable speed system further comprises a rear output shaft which can be matched with the front output shaft in a clutching mode for outputting power to a vehicle rear wheel to switch between two-wheel driving and four-wheel driving; the hollow power shaft of the hollow motor is used for inputting the power to the transmission, and the front output shaft taken as the power output end of the transmission can penetrate the hollow power shaft in a relatively rotating way for driving a vehicle front wheel, so that a matching structure of the hollow motor and the transmission is quite compact to reduce the occupied space, and the rear output shaft which is matched with the front output shaft in the clutching mode realizes switching between the two-wheel driving and the four-wheel driving, and a variable speed output component can be together used to realize output of multiple working modes, so that the drive switching and transmission variable speed system of the hollow motor type electric vehicle can be used under multiple working conditions.

Description

technical field [0001] The invention relates to the field of electric vehicle power drive, in particular to a hollow motor type electric vehicle drive switching and transmission shifting system. Background technique [0002] Environmental protection has become a hot topic in the world today. The characteristics of zero emission and low pollution of pure electric vehicles make pure electric vehicles a hot spot in the development and research of the automobile industry. In view of the lack of a unified design and layout of the main components of the pure electric vehicle power transmission system (drive motor, transmission and differential) during the research and development process, the power transmission system has a complex structure, bulky volume, increased weight, scattered systems, and high costs. Conducive to its development and industrialization, the integration of drive motors, transmissions, and differentials is an inevitable choice for the development of pure elect...

AI Technical Summary

Problems solved by technology

In view of the lack of a unified design and layout of the main components of the pure electric vehicle power transmission system (drive motor, transmission and differential) during the research and development process, the power transmission system has a complex structure, bulky volume, increased weight, scattered systems, and high costs. Conducive to its development and industrialization, the integration of drive motors, transmissions, and differentials is an inevitable choice for the development of pure electric vehicles

Among the many pure electric transmission systems at present, for example, the Chevrolet Bolt pure electric vehicle under GM uses a hollow motor, a fixed reduction ratio reducer, a clutch, and a transmission shaft integration, but this transmission system cannot realize gear shifting, which reduces energy utilization Efficiency, Tesla pure electric vehicles still use a transfer case to achieve power transmission, its complex structure increases the quality of the vehicle

The integrated power transmission system of pure electric vehicles has parallel shaft, triangular type and planetary gear output structure. The traditional parallel shaft output technology is mature and simple in structure, but it takes up a lot of space. The planetary gear output mechanism takes up a small space. Difficult gear shifting in stage planetary gear transmission system

In addition, most electric vehicles currently use a single fixed speed ratio reducer, so that the drive motor often works in a low-efficiency area, resulting in waste of energy and reducing the driving range of the vehicle

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