Continuously variable transmission of electric vehicle

Abstract

The invention relates to a continuously variable transmission of an electric vehicle. Power generated by an electromotor unit is decelerated through a sun gear, a sun gear magnet, a gear ring magnet, a gear ring and a flux adjustable gear, transmitted to a continuously variable unit and divided. One path of the power is output through double sun gears, a third-level planet gear and a third-level gear ring and the other path of the power is output through a first-level gear ring, a second-level planet gear, a second-level gear ring, a third-level planet gear and a third-level gear ring. A first-level piston and a second-level piston are used for continuous speed regulation of a high-speed zone and a low-speed zone respectively and used for controlling differential motion balance change of transmission of the differential planet gears so that continuous speed regulation can be achieved. The first-level piston and the second-level piston are interlocked in work, when one piston supplies pressure oil, the other piston is completely relaxed and does not work, namely the other piston is in the neutral gear state, when a gear is operated forwards, the electromotor unit rotates forwards, and when the gear is operated backwards, the electromotor unit rotates backwards. According to the continuously variable transmission of the electric vehicle, a clutch is not needed, the transmission speed ratio is large, acceleration is stable, it is guaranteed that an electromotor can work in an ideal zone all the time, design is ingenious, the structure is simple, and use is convenient.

Description

technical field [0001] The patent of the present invention relates to a continuously variable transmission for an electric vehicle, in particular to a continuously variable transmission for an electric vehicle using a planetary gear structure. Background technique [0002] With the rise of fuel prices and the continuous enhancement of people's awareness of environmental protection, electric vehicles have the characteristics of "zero" emissions. For high-end electric vehicles, clutches and traditional manual transmissions are generally used to change gears. The operation is complicated and the driver's labor intensity is high. In addition, clutches and transmissions will greatly increase the cost of electric vehicles, which is not conducive to the miniaturization of electric vehicles; The automatic transmission adopted is essentially a step change, just automatic shifting, its complex structure, difficult manufacturing process and high processing cost; the planetary gear tran...

AI Technical Summary

Problems solved by technology

[0002] With the rise of fuel prices and the continuous enhancement of people's awareness of environmental protection, electric vehicles have the characteristics of "zero" emissions. For high-end electric vehicles, clutches and traditional manual transmissions are generally used to change gears. The operation is complicated and the driver's labor intensity is high. In addition, clutches and transmissions will greatly increase the cost of electric vehicles, which is not conducive to the miniaturization of electric vehicles; The automatic transmission adopted is essentially a step change, just automatic shifting, its complex structure, difficult manufacturing process and high processing cost; the planetary gear transmission in the gear transmission has higher mechanical efficiency than the external meshing gear transmission, and the larger Bearing power, the structure is more compact and the volume is smaller. However, the planetary gear mechanism has not yet realized variable speed transmission, let alone continuously variable transmission.

[0003] Due to the current tendency of the motor to be designed at a high speed, the mechanical gear has vibration and noise due to its own characteristics, and it needs to be used under lubrication and requires regular maintenance. The requirements of the transmission system are also getting higher and higher. The performance of mechanical gears has been greatly improved through the selection of high-performance materials, the finishing treatment of the tooth shape, and the improvement of lubrication, but these problems have not been fundamentally solved.

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