Electric-drive mechanical type variable-speed power transmission system and control system thereof

Abstract

The invention discloses an electric-drive mechanical type variable-speed power transmission system for electric vehicles, which comprises a vehicle motor (2) and a speed-changing gearbox (1), wherein the speed-changing gearbox (1) comprises a power input shaft (27), a power output shaft (28), an intermediate shaft (29), gears (35, 36, 37, 38, 39 and 40) and an air cylinder (30), the air cylinder (30) is connected with a shifting fork through a piston (31), the shifting fork is correspondingly connected with the gears, and the output shaft (27) of the vehicle motor (27) and the input shaft (27) of the speed-changing gearbox share the same shaft. The speed-changing gearbox is provided with a gear shifting interlocking device formed by an ejector rod (53), positioning steel balls (51 and 52) on two sides of the ejector rod (53), and the shifting fork; and the shifting fork is provided with a positioning groove matched with the positioning steel balls. Due to the function of the gear shifting interlocking device, the phenomena of gear disorder, gear misoperation and gear striking generated by the traditional speed-changing gearbox without a synchronizer during speed changing can be avoided, and gear shifting is smooth and more reliable.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle transmission systems, and in particular relates to an electric-driven mechanical variable-speed power transmission system. Background technique [0002] Electric vehicles include pure electric vehicles, hybrid electric vehicles and fuel cell electric vehicles. Its driving motor often adopts AC induction motor and AC permanent magnet motor. [0003] These two kinds of motors can adopt frequency conversion technology to realize stepless speed regulation, so variable speed transmission devices are generally not required on industrial machinery. However, for vehicles with high speed requirements and strong climbing ability, this configuration is difficult to meet the driving requirements of the vehicle. The variable speed ratio gear transmission device can meet the driving requirements of the highest speed and improve the climbing ability of the wheels. [0004] The variable speed ratio ge...

AI Technical Summary

Problems solved by technology

When using the water channel water cooling cycle method, in order to process the water channel inside the shell, the shell is made of two parts, the inner and outer shell, which are heat-fitted and welded, which may cause water leakage accidents

Although the coiled water cooling circulation method overcomes the shortcomings of water leakage in the water channel water cooling circulation method, its heat dissipation effect is not good

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