Hydraulic system capable of reducing cost for excavator

Abstract

The invention discloses a hydraulic system capable of reducing cost for an excavator. The hydraulic system comprises a hydraulic oil tank and a multiway valve, a steering gear and a hydraulic pilot system which respectively communicate with the hydraulic oil tank, wherein the hydraulic system further comprises a main oil supply pump and a secondary pressure reducing valve; a main oil supply path communicating with the oil inlet end of the multiway valve is arranged on the oil outlet end of the main oil supply pump; an oil supply branch communicating with the oil inlet end of the secondary pressure reducing valve is arranged on the oil outlet end of the main oil supply path; and a steering gear oil supply path communicating with the oil inlet end of the steering gear, a pilot control oil supply path communicating with the oil inlet end of the hydraulic pilot system and a main oil leakage path communicating with the hydraulic oil tank are arranged on the oil outlet end of the secondary pressure reducing valve. Compared with the prior art, the hydraulic system has the advantages that the secondary pressure reducing valve is capable of replacing at least two pump bodies for oil supply,so that the cost is greatly saved; and meanwhile, the hydraulic system is compact in overall structure, the overall weight is reduced, the installation space is saved, and the structural arrangementof the hydraulic system is facilitated.

Description

technical field [0001] The invention relates to the field of excavator hydraulic systems, in particular to an excavator hydraulic system capable of reducing costs. 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...

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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