Electrically-driven tractor CVT power assembly with rear-mounted power take-off (PTO) structure

Abstract

The invention provides an electrically-driven tractor CVT power assembly with a rear-mounted power take-off (PTO) structure. The structure comprises an engine, a generator, a main driving motor, a transmission, a PTO motor, a PTO transmission case, a front axle, a rear axle, a transfer case and an energy storage unit, the engine is in transmission connection with the generator, the main driving motor is in transmission connection with the transmission, the transmission is in transmission connection with the rear axle, the transmission is further in transmission connection with the transfer case, and the transfer case is in transmission connection with the front axle through a front driving shaft; the PTO motor is in transmission connection with the PTO transmission box; and the energy storage unit is electrically connected with the generator, the main driving motor and the PTO motor. According to the electrically-driven tractor CVT power assembly with the rear-mounted power take-off (PTO) structure, the characteristics that the motor is low in speed, large in torque and wide in rotating speed range are utilized, gear switching of a transmission is not carried out, the motor is directly used for speed regulation, and stepless speed change in the operation process is achieved.

Description

technical field [0001] The invention belongs to the technical field of transmission, and in particular relates to an electric drive tractor CVT power assembly with a rear-mounted electric PTO structure. Background technique [0002] The existing tractor transmission system is divided into manual shift transmission system, power uninterrupted automatic transmission transmission system and hydraulic mechanical continuously variable transmission system (HMCVT) according to the shifting mode. [0003] When the tractor is working in the field with a manual shifting transmission system, due to the large change in land resistance and the large change in the load of the whole machine, the tractor with the manual transmission transmission system needs to stop and change gears frequently to meet the traction and speed requirements of farm implements and the work intensity of employees. Large, low operating efficiency, unstable operating quality; at the same time, the engine speed is d...

AI Technical Summary

Problems solved by technology

[0011] The high-pressure variable piston pump / motor, proportional valve, etc. used in the transmission system are precision hydraulic couplings, which have very high requirements for assembly cleanliness, use cleanliness, and maintenance cleanliness. Special hydraulic oil is required, and the use and maintenance costs are high. ;

[0012] The transmission of this system adopts multi-row planetary mechanism and wet clutch or brake to realize the regional transformation of 4-6 gears. The system has many parts and complex structure. The key technology of the system is basically mastered by foreign companies. The products mainly rely on imports. The cost is high and the price reduction is difficult

[0013] The transmission efficiency of this transmission system is low, the maximum can only reach about 80%, which is lower than other transmission systems, and the fuel economy is poor

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