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, which comprises an engine, a generator, a PTO motor, a clutch, a speed reducer, a PTO transmission case, an electrically-driven front axle, an electrically-driven rear axle and an energy storage unit, a front axle motor is arranged on the electrically-driven front axle, a rear axle motor is arranged on the electrically-driven rear axle, and a rear axle motor is arranged on the rear axle. The engine is in transmission connection with the generator, the PTO motor is in transmission connection with one end of the clutch, the other end of the clutch is in transmission connection with the speed reducer, and the speed reducer is in transmission connection with the PTO transmission box; the energy storage unit is electrically connected with the front axle motor, the rear axle motor, the PTO motor and the generator. According to the electrically-driven tractor CVT power assembly of the rear power-on 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 gearbox 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 shift of 4-6 gears. The system has a large number of parts and a complex structure. The key technologies of the system are basically mastered by foreign companies, and the products mainly rely on imports. High cost of transmission system, difficult to reduce price

[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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