Construction Machinery Hydraulic Steering System

Abstract

The invention discloses a construction machinery hydraulic steering system, which belongs to the technical field of construction machinery hydraulic systems. The system includes a control part and a driving part. The control part includes a steering gear; the driving part includes a steering oil cylinder and a steering pump. There is a flow amplifying valve in communication with the steering cylinder on the oil circuit. The inside of the flow amplifying valve has a main spool to control the oil flow. The oil port is connected, and the hydraulic control port of the hydraulic control reversing valve is connected with the steering pump through the motorized reversing valve and the pressure reducing valve; limit blocks are set on the frame of the construction machinery corresponding to both sides of the motorized reversing valve . The hydraulic circuit control method of the present invention is simple and reliable. When the oil cylinder is turned at the limit position, the system has no overflow loss, and the hydraulic impact of the steering oil cylinder limit position on the frame is eliminated. It not only saves energy but also does not shake when the steering stops. Improve the vehicle comfort.

Description

technical field [0001] The invention relates to the technical field of engineering machinery hydraulic systems, in particular to an engineering machinery hydraulic steering system. Background technique [0002] Existing construction machinery hydraulic steering system, such as Figure 5 As shown, it includes a control part and a drive part. The control part includes a steering gear; the drive part includes a steering cylinder 11 and a steering pump 13, and a flow amplification valve 12 is connected in series on the oil circuit between the steering pump 13 and the steering cylinder 11. There is a main valve core 12-1 inside the flow amplifying valve to control the oil displacement, and the two hydraulic control ports 12-1A and 12-1B of the main valve core 12-1 are respectively connected with the two oil outlet ports 15b and 15c of the steering gear , the oil inlet 15a of the steering gear 15 communicates with the oil outlet 13a of the steering pump through the pressure reduci...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a hydraulic steering system for engineering machinery, which can solve the problem of shaking caused by the large impact force of the oil cylinder on the frame, resulting in loose and easily damaged parts of the engineering machinery and the movement of the oil cylinder to the limit When the position is high, high pressure and large flow overflow will cause energy loss and accelerate oil heating.

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