Throttling hydraulic system of excavator

Abstract

The invention discloses a throttling hydraulic system of an excavator. The throttling hydraulic system comprises a hydraulic oil tank, a multi-way valve, a steering gear and a hydraulic pilot system,wherein the multi-way valve, the steering gear and the hydraulic pilot system communicate with the hydraulic oil tank, and further comprises a first pump body, a second pump body and a secondary pressure reducing valve, wherein the oil outlet end of the first pump body and the oil outlet end of the second pump body communicate with the oil inlet end of the multi-way valve, the oil outlet end of the second pump body further communicates with the oil inlet end of the secondary pressure reducing valve, and the oil outlet end of the secondary pressure reducing valve communicates with the oil inletend of the steering gear and the oil inlet end of the hydraulic pilot system. Compared with the prior art, the throttling hydraulic system has the beneficial effects that two pump bodies are replacedby the secondary pressure reducing valve to realize oil supply, the number of the pump bodies is reduced, and an engine only needs to provide power take-off points of the two pumps, so that the structural arrangement of the hydraulic system is facilitated, the mounting space is saved, and meanwhile, the overall weight and the cost are greatly reduced. Besides, a first pump body and a second pumpbody are adopted to supply oil to the multi-way valve and can be used for a throttling system for confluence outside the valve, selection of valve elements connected to an oil way is more flexible, and the cost of the valve elements is reduced.

Description

technical field [0001] The invention relates to the field of excavator hydraulic systems, in particular to an excavator throttling hydraulic system. Background technique [0002] The hydraulic system of the excavator is composed of some basic circuits and auxiliary circuits. Its function is to use oil as the working medium, use the hydraulic pump to convert the mechanical energy of the engine into hydraulic energy and transmit it, and then transfer the hydraulic energy through the hydraulic cylinder and hydraulic motor. It can be converted back into mechanical energy to realize various actions of the excavator. [0003] The hydraulic system of the existing wheeled excavator such as figure 1 As shown, it mainly includes a multi-way valve 1' for the main work, a steering gear 2' and a hydraulic pilot system 3' for manipulating the hydraulic system. When working, one or two oil supply pumps are used to provide working oil pressure to the multi-way valve 1', and another pump i...

AI Technical Summary

Problems solved by technology

However, this oil supply method needs to use at least three or four oil supply pumps. The number of pumps is large, and the engine needs to have multiple power points; or it can be realized in the form of series pump bodies behind the pump body, but the pump body takes up space. Many, high cost, and have high requirements on the strength of the main shaft of the pump body

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