Two-gear electromobile power assembly

Abstract

The invention discloses a two-gear electromobile power assembly which comprises a housing. An input shaft set, a gear ring, a sun gear, an output shaft set, a first-gear brake and an electric hydraulic controller are arranged in the housing. According to the two-gear electromobile power assembly, two forward gears are freely switched through an electronic control hydraulic system, and the requirement of an electromobile is met under different road surface conditions without cutting off power. The two-gear electromobile power assembly enables a permanent magnet synchronous motor and a two-gear automatic gearbox to be effectively combined together, and has the advantages of small size, simple structure, low production cost, high transmission efficiency, increased driving range, long battery service life and the like.

Description

technical field [0001] The invention relates to an electric vehicle, more precisely, a power assembly of a two-speed electric vehicle. Background technique [0002] Electric vehicles have no exhaust gas produced by internal combustion engine vehicles, and do not produce exhaust pollution. They are very beneficial to environmental protection and air cleanliness, and are almost "zero pollution". Existing pure electric vehicles generally use a reduction gear with a single speed ratio. When the car starts or climbs a slope, the power output by the drive motor must pass through a large reduction ratio to obtain enough torque to drive the car, but when driving at high speed, the car needs a small reduction ratio to make the vehicle reach the highest speed. speed requirements. It is difficult to meet the performance requirements of high-speed driving (above 120km / h) and low-speed climbing (above 25% slope) due to the single-speed ratio deceleration device. To meet high-speed r...

AI Technical Summary

Problems solved by technology

Because the single-speed ratio reduction device is difficult to meet the performance requirements of high-speed driving (above 120km / h) and low-speed climbing (above 25% slope)

To meet high-speed requirements, the motor speed must be increased, which increases the cost of the motor and reduces reliability

However, when starting at low speed or climbing a hill, the motor current is too large, which brings a series of disadvantages such as low efficiency, reduced driving range, increased controller manufacturing cost, and shortened battery life.

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