Bulldozer and its drive

Abstract

The invention discloses a bulldozer and its driving device. The driving device includes a first motor assembly driving two track wheels; a second motor assembly also driving two track wheels, and its rated power is greater than that of the first motor assembly. Motor assembly; a control unit, controlling the first motor assembly and / or the second motor assembly to output power or cut off the power output. The driving device of the bulldozer can select the first motor assembly and / or the second motor assembly as the power source according to the working conditions of the bulldozer, so as to ensure that the first motor assembly and the second motor assembly work in the high-efficiency area, which can not only improve The working efficiency of the first motor assembly and the second motor assembly can also prolong their service life.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a bulldozer and a driving device thereof. Background technique [0002] Please refer to figure 1 , figure 1 It is a schematic diagram of the working principle of the driving device of the existing bulldozer. [0003] The existing bulldozer is driven by the engine to generate electricity, and the generated electric energy drives the motor to drive the bulldozer to complete various tasks. Such as figure 1 As shown in , the engine 11 and the generator 12 are connected in series to convert the mechanical energy of the engine 11 into electrical energy. After the electrical energy is transmitted through a high-voltage transmission line, the electrical energy is converted into mechanical energy through two drive motors 13 with the same rated power, and then through two identical The final reduction system 14 drives the two wheels 15 respectively to realize the straight...

AI Technical Summary

Problems solved by technology

When the bulldozer is working, it will frequently change between the load condition and the no-load condition, resulting in the two driving motors 13 working under two conditions of relatively high speed and low load and low speed and high load in most cases. , and the high-efficiency working area of ​​the driving motor 13 cannot cover the above two working conditions at the same time, resulting in low working efficiency of the driving motor 13, greatly shortening the service life of the driving motor 13, and shortening the maintenance cycle of the bulldozer;

[0007] Second, the two wheels 15 are independently driven by two drive motors 13 with the same rated power; in the process of bulldozer advancement, the resistance received by the bulldozer blade in the lateral direction is unequal. The bulldozing resistance on both sides is quite different, that is, there is a resistance difference, and the resistance difference is constantly changing. When the bulldozer is moving forward, the two drive motors 13 will distribute the same torque or speed demand by default. When the resistance on the left and right sides of the bulldozing blade is different, the HCU (Hybrid Control Unit, Hybrid Control Unit) will adjust the torque demand of the drive motor 13 according to the actual situation, but this adjustment requires a process, and the resistance The difference changes from time to time, resulting in the actual speed of the two drive motors being unequal in most cases. It is difficult for the bulldozer to travel in a straight line as expected during the bulldozing process, and there is a phenomenon of deviation, which cannot meet the needs of the bulldozer in bulldozing. Functional requirements at work

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