Engineering vehicle and hydraulic drive system of traveling system of engineering vehicle

Abstract

The invention discloses a hydraulic drive system of a traveling system of an engineering vehicle. The hydraulic drive system comprises a variable displacement pump connected with a power device, a variable displacement motor, and a displacement control loop, wherein the variable displacement pump is connected with a power device and is provided with a first port and a second port, and the first port and the second port are used for discharging return oil; the variable displacement motor is connected with a gearbox, and comprises a first oil inlet and outlet opening communicating with the firstport, and a second oil inlet and outlet opening communicating with the second port; the displacement control loop is used for controlling displacement of the variable displacement motor according tochange of the working load; an oil inlet of the displacement control loop is selectively connected with the first port and the second port; and an oil outlet of the displacement control loop is connected with a variable displacement mechanism of the variable displacement motor. The hydraulic drive system can shift a gear when the variable displacement motor gains power, and loaded gear shifting ofthe variable displacement motor is achieved. The invention further discloses the engineering vehicle comprising the hydraulic drive system.

Description

technical field [0001] The invention relates to the technical field of engineering vehicle drive control, and more specifically, relates to a hydraulic drive system of an engineering vehicle walking system. In addition, the present invention also relates to an engineering vehicle comprising the above-mentioned hydraulic drive system. Background technique [0002] In the walking system of agricultural vehicles such as crawler harvesting machinery and wheeled machinery, a closed hydraulic system composed of a variable pump and a quantitative motor is usually used to drive the walking wheels. That is, the engine is connected to the variable pump through a pulley transmission. The working oil circuit of the pump is connected to the quantitative motor, and the quantitative motor is connected to the gearbox of the walking system. When working, the displacement of the variable pump is changed by changing the engine speed, and the output of the quantitative motor is changed by chang...

AI Technical Summary

Problems solved by technology

However, when agricultural machinery is operating in small fields in the south, the main engine of the vehicle must frequently turn, climb slopes, and cross field ridges. Therefore, the operator needs to stop and switch gears frequently, resulting in low operating efficiency and easily causing fatigue to the operator. sense

In actual operation, in order to improve work efficiency, operators often perform steering operations without slowing down, which poses a great safety hazard

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