Electric Vehicle Automatic Transmission

Abstract

The utility model discloses an automatic transmission for an electric automobile. A gear-shifting power shaft of the automatic transmission is connected with a synchronizer through a planet lifting mechanism and a gear-shifting shifting fork arranged on the planet lifting mechanism. Due to the fact that the rotating speed of a servo motor is very high, the speed is effectively reduced through a planetary mechanism, a spiral lifting mechanism is matched, the displacement speed of a lifting rod is effectively reduced to the gear-shifting speed conforming to the practice, and the power requirements of the servo motor are reduced; the gear-shifting power requirements can be met by adopting the small-power servo motor, and the production cost is reduced. A power input shaft is in transmission connection with an output shaft or a differential through an intermediate driving shaft parallel to the power input shaft, the intermediate driving shaft is meshed with two small gears of the power input shaft through two large gears of the intermediate driving shaft, a secondary driving gear between the large gears is meshed with the output shaft or a secondary driven gear on the differential to achieve power output, the stress of the structure of a whole device is more balanced and stable through the intermediate driving shaft, the structure is more reasonable, the abrasion is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of transmission devices for electric vehicles, in particular to an automatic transmission for electric vehicles driven by a deceleration mechanism for gear shifting. Background technique [0002] The domestic automobile industry is growing day by day, and the number of vehicles is increasing. The ensuing air quality degradation and environmental pollution are becoming more and more serious. Electric vehicles, as a clean energy transportation tool, are now more and more accepted and valued by people. Traditional electric vehicles use a DC motor connected to a gearbox with a fixed speed ratio, and rely on the speed regulation of the DC motor to control the vehicle's driving speed. Due to the inherent limitations of the motor torque characteristics, this type of electric vehicle often exhibits a When the torque is insufficient, it is difficult to start on ramps and potholes. Subsequently, a two-speed gearbox s...

AI Technical Summary

Problems solved by technology

For example, the existing patent discloses a two-speed automatic transmission for electric vehicles, which realizes the problem of adjusting the power output of electric vehicles through two-speed transmission. The control motor is driven to rotate to shift gears. Since the speed of the control motor is very high, the convex groove shaft only needs to rotate a small angle of rotation when shifting gears. In practical applications, the speed of the control motor is difficult to control, and its shift speed is difficult. It is practical and not easy to realize. At the same time, there are also defects that it is easy to get out of gear, so it is difficult to widely promote and use it in actual products.

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