A quick-closing and slow-opening hydraulic priority valve

Abstract

A quick-closing and slow-opening hydraulic priority valve belongs to the field of hydraulic energy saving. It includes pilot valve, main valve, speed regulating valve and one-way valve; the pilot valve is installed on the main valve, the speed regulating valve is integrated inside the main valve core of the main valve, and the one-way valve and the main valve share a valve body. The valve body is provided with a port A connected to the oil supply inlet of the main pump at the main valve and a port D connected with the ordinary load circuit. The C port of the blocking circuit, the F port connected to the oil tank is provided on the pilot valve, and the feedback chamber E provided by the pilot valve is always connected with the oil chamber A of the main valve, and the chamber G of the pilot valve is always connected with the chamber H of the main valve. connected. By integrating a speed regulating valve inside the main valve spool, the present invention can not only realize the priority oil supply of the main and auxiliary pumps for the circuits such as steering and shifting control, and make the steering and shifting speed stable and reliable, but also effectively alleviate the There is a certain lag in the dynamic response of the traditional hydraulic priority valve spool.

Description

technical field [0001] The invention belongs to the field of hydraulic energy saving, in particular to a hydraulic priority valve. Background technique [0002] Hydraulic priority valves are often used in construction machinery, metallurgy, automobile and other industries. Taking construction machinery as an example, the hydraulic steering system and shift control system in construction machinery currently use load sensing systems, and the hydraulic priority valve is the key component of the system. The function of the hydraulic priority valve is to control the order in which the pump group supplies oil to different oil circuits. From the perspective of functional requirements, it can be regarded as a three-way fixed differential flow valve. In construction machinery, the hydraulic priority valve can preferentially distribute the inlet flow to the steering oil circuit and the control oil circuit according to the steering speed and the needs of shifting manipulation. During...

AI Technical Summary

Problems solved by technology

The reason is that most traditional hydraulic priority valves only control the opening and closing of the main valve through a throttle port. Although the basic functions can also be realized, the speed of valve opening and closing cannot be adjusted.

On the one hand, when the vehicle’s steering circuit and gear shift control circuit are in urgent need of oil, this design may cause a delay in the closing speed of the main valve, which slows down the mechanical response speed; on the other hand, when the steering circuit and gear shift control circuit use oil When the demand is met and the priority valve distributes excess oil to other working circuits, this design may cause the main valve to open faster, resulting in large pressure fluctuations before and after the steering gear and shifter, which in turn affects the overall working performance of the machine

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