Electric vehicle speed reducer

Abstract

The invention relates to an electric vehicle speed reducer which comprises an input shaft, an output shaft and a differential speed device, wherein an input shaft gear is rigidly connected to the input shaft, an output shaft first gear and an output shaft second gear are rigidly connected to the output shaft, a differential speed device gear is rigidly connected to the differential speed device, the input shaft gear is meshed with the output shaft first gear, and the output shaft second gear is meshed with the differential speed device gear. The electric vehicle speed reducer with the structure can satisfy all work conditions from low-speed large torque moment to high-speed running of an electric vehicle; has the advantages of simple structure, small part amount, and low production cost by adopting compact design and is convenient for manufacture and maintenance; meanwhile, because of lowering the size and the weight of a power assembly, the invention is beneficial to the enhancing of the transfer efficiency of the power assembly, the lowering of the noise of the power assembly, the increasing of a driving range of the electric vehicle and the applying of the electric vehicle to the small-sized vehicle field.

Description

technical field [0001] The invention relates to the field of vehicle transmission systems, in particular to the field of electric vehicle transmission systems, and specifically refers to a speed reducer for electric vehicles. Background technique [0002] Due to the advantages of low noise, zero emission, comfort and cleanliness, electric vehicles are the only way to achieve automation and intelligent development of automobiles. At present, the amount of oil used in the world is increasing, but the amount of oil that can be exploited is decreasing. Therefore, it is an inevitable trend for the development of the automobile industry to replace conventional fuel vehicles with electric vehicles. [0003] At present, the deceleration and torque-increasing mechanism of electric vehicles, especially pure electric vehicles, mainly adopts the transformation of conventional automobile transmissions or 2-3 gears. Since the operating conditions of conventional vehicles are very differe...

AI Technical Summary

Problems solved by technology

Due to the great difference between the operating conditions of conventional vehicles and pure electric vehicles, the transformation of conventional vehicle transmissions into pure electric vehicles has inherent deficiencies, such as short bearing life, poor oil seal performance, and high noise.

2-3 gears are mainly used for models with different operating conditions. In small cars, since the drive motor itself has the function of speed regulation, the speed regulation function of the gearbox is repeated with the gear shifting function of the gearbox, which increases the manufacturing cost. , causing waste

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