Hybrid power driving device of bulldozer and bulldozer

Abstract

The invention discloses a hybrid power driving device of a bulldozer, which comprises an engine, a generator, a current control module and an electrical motor, wherein an output shaft of the engine is connected with a power distribution device, an output shaft of the power distribution device is connected with the generator, alternating current generated by the generator is converted by the current control module and then drives the electrical motor, and the electrical motor drives a drive sprocket and an apron wheel. The driving device is steady and reliable in transmission and low in noise and oil consumption, has high transmission efficiency, can respond to changes of loads quickly, and can achieve stepless speed change. The invention also discloses the bulldozer with the driving device.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a hybrid driving device of a bulldozer. The invention also relates to a bulldozer provided with said drive device. Background technique [0002] As people pay more and more attention to the protection of the environment and the effective and rational use of energy, high-efficiency, energy-saving and environmentally friendly bulldozers have become the development trend of the bulldozer industry. [0003] At present, the power transmission methods applied to bulldozers mainly include mechanical transmission, hydromechanical transmission and hydrostatic transmission. The power transmission methods and their advantages and disadvantages are as follows: [0004] 1) Mechanical transmission refers to the use of mechanical means to transmit power and motion. The power transmission route is: engine-clutch-gearbox-transmission shaft-steering clutch and brake-final drive-driv...

AI Technical Summary

Problems solved by technology

[0004] 1) Mechanical transmission refers to the use of mechanical means to transmit power and motion. The power transmission route is: engine-clutch-gearbox-transmission shaft-steering clutch and brake-final drive-drive wheel; mechanical transmission is efficient, stable and reliable , but it is difficult to realize stepless speed change, and the adaptive ability to load is also poor

[0005] 2) Hydraulic transmission is a widely used transmission method at present. It uses the interaction between the working blade and the working liquid to cause the mutual conversion of mechanical energy and liquid energy, so as to transmit power, and change the fluid momentum through the change of fluid momentum. Torque, its power transmission route is: engine - torque converter - gearbox - central transmission - steering clutch and brake - final drive - driving wheel; hydraulic transmission reduces the vibration of the vehicle, making the vehicle accelerate evenly and softly, with a certain The load adaptive ability, but the transmission efficiency is low, the high efficiency range is narrow, and the continuously variable speed cannot be realized.

[0006] 3) Hydrostatic transmission, which uses the pressure energy of the liquid to transmit power. The power transmission route is: engine-hydraulic pump-hydraulic motor-final drive-driving wheel; Adaptability, but affected by oil flow resistance and leakage, the transmission efficiency is low, coupled with the compressibility of oil, it cannot guarantee a strict transmission ratio

These transmission methods have their own insurmountable deficiencies, such as loud noise, high fuel consumption, low transmission efficiency, slow response to load, and inability to realize stepless speed change, etc.

[0008] In addition, thanks to the rapid development of automotive hybrid technology, hybrid power is becoming the main direction for the development of construction machinery power technology. However, the existing hybrid power system for bulldozers that integrates mechanical transmission and motor drive requires a mechanically integrated box device. The machine and electricity are highly integrated, and the stability and heat dissipation of the whole system are difficult to meet the work requirements.

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