Reversing hydraulic device for tractor

Abstract

A reversing hydraulic device for a tractor is mainly composed of a reversing valve, an inching valve, a pressure adjusting valve, a proportional pressure reducing valve and an energy storage valve. Aninlet of an oil way on a valve body communicates to the pressure adjusting valve, after the oil way passes through the pressure adjusting valve and the work oil pressure is adjusted, the oil way is divided into two oil ways, one oil way communicates to the energy storage valve, and the other oil way communicates with the reversing valve through the inching valve the proportional pressure reducingvalve, wherein the reversing valve is used for switching the oil ways and enabling oil to flow into a clutch. The pressure adjusting valve mainly adjusts the work oil pressure of the reversing clutchof the tractor. A pipeline filter mainly guarantees cleanliness of oil of a hydraulic system. The energy storage valve mainly alleviates impacting and eliminates pulsation. Through the arrangement ofthe proportional pressure reducing valve and the inching valve, the reasonable pressure increase character of the work oil pressure of the reversing clutch and the low-speed advancing requirement ofthe tractor are achieved. Through the arrangement of the reversing valve, switching of the advancing and retreating oil ways is achieved. The reversing hydraulic device has the advantages of being simple in transmission line, convenient to mount, maintain and operate, high in work efficiency, low in manufacturing cost and the like.

Description

technical field [0001] The invention relates to a reversing hydraulic device for a tractor, which belongs to the technical field of hydraulic control of a tractor power shift gearbox. Background technique [0002] At present, most of the tractor gearboxes developed by domestic tractor enterprises are gear shifting or synchronizer shifting. The output torque and speed of such products vary greatly. When shifting gears, the clutch needs to be stepped on first, and the timing of shifting is high. Inaccurate timing of gear shifting can easily cause large impact or flameout, resulting in increased labor intensity, prolonged shifting time, low operating efficiency, and difficulty in ensuring power and fuel economy. Most of the existing power shift gearboxes are imported products or imported foreign technology. The structure of such foreign products is extremely complicated, and they all adopt an integral structure, and the maintenance is extremely inconvenient and costly. They are...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the tractor gearboxes developed by domestic tractor enterprises are gear shifting or synchronizer shifting. The output torque and speed of such products vary greatly. When shifting gears, the clutch needs to be stepped on first, and the timing of shifting is high. Inaccurate timing of gear shifting can easily cause a large impact or flameout, resulting in increased labor intensity, prolonged shifting time, low operating efficiency, and difficulties in guaranteeing power and fuel economy, etc.

Most of the existing power shift gearboxes are imported products or imported foreign technology. The structure of such foreign products is extremely complicated, and they all adopt an integral structure, and the maintenance is extremely inconvenient and costly. They are not suitable for the domestic market. There are still many problems in electronic control, hydraulic pressure and machinery, and many domestic manufacturing, processing methods, reliability and vehicle matching problems have also appeared in the imitation of such products.

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