Construction Machinery Hydraulic Steering System

Abstract

The invention discloses a hydraulic steering system for engineering machinery, which belongs to the technical field of hydraulic systems for engineering machinery. The system includes a control part and a driving part. The control part includes a steering gear; the driving part includes a steering cylinder and a steering pump. The steering pump There is a flow amplification valve connected to the oil line between the steering cylinder and the steering cylinder. The flow amplification valve has a main valve core that controls the oil flow. The two hydraulic control ports of the main valve core pass through the hydraulic control reversing valve and the two outputs of the steering gear respectively. The oil ports are connected, and the hydraulic control port of the hydraulic control reversing valve is connected to the steering pump through the motorized reversing valve and the pressure reducing valve; limit blocks are provided on both sides of the engineering machinery frame corresponding to the motorized reversing valve. . The hydraulic circuit control method of the present invention is simple and reliable. When turning at the extreme position of the oil cylinder, the system has no overflow loss, eliminating the hydraulic impact of the extreme position of the steering oil cylinder on the vehicle frame. It not only saves energy but also prevents shaking when the steering stops. Improved vehicle comfort.

Description

Technical field [0001] The invention relates to the technical field of hydraulic systems for engineering machinery, and in particular to a hydraulic steering system for engineering machinery. Background technique [0002] Existing construction machinery hydraulic steering systems, such as Figure 5 As shown, it includes a control part and a driving part. The control part includes a steering gear; the driving part includes a steering cylinder 11 and a steering pump 13. There is a flow amplification valve 12 connected on the oil line between the steering pump 13 and the steering cylinder 11. The flow amplification valve has a main spool 12-1 inside that controls the oil displacement. The two hydraulic control ports 12-1A and 12-1B of the main spool 12-1 are respectively connected with the two oil outlets 15b and 15c of the steering gear. , the oil inlet 15a of the steering gear 15 is connected to the oil outlet 13a of the steering pump through the pressure reducing valve 14. ...

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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