Main pressure control valve group for quantitative pump

Abstract

The invention relates to a principal pressure control valve unit for a metering pump of a hydro-pneumatic suspension attitude adjusting system. The principal pressure control valve unit mainly comprises a defibrillation valve, a two-position three-way flow control valve and an overflow valve, wherein both the overflow valve and the two-position three-way flow control valve are connected between an oil inlet way of the pump and an oil return way of the system in parallel, the defibrillation valve is arranged on an oil way of a first control end of the two-position three-way flow control valve, the first control end is connected with a control end of the principal pressure control valve unit to enable the highest load pressure of the system to enter the defibrillation valve, and stable pressure signals are transmitted to the first control end of the two-position three-way flow control valve through damping and throttling; the first control end of the two-position three-way flow control valve and a backpressure spring of a valve element of the two-position three-way flow control valve are located on the same side, a second control end of the two-position three-way flow control valve is communicated with an oil inlet way of the system, and the pressure of the second control end of the two-position three-way flow control valve is always equal to the sum of the force of the backpressure spring of the two-position three-way flow control valve and the pressure of the first control end.

Description

technical field [0001] The invention relates to a main pressure control valve group for a quantitative pump of an oil-gas suspension vehicle posture adjustment system, which belongs to the application field of hydraulic machinery and motor vehicles. Background technique [0002] By adopting oil-pneumatic suspension technology, the vehicle's handling performance and driving comfort are greatly improved, and the technical problem of non-adjustable stiffness characteristics of the elastic components of the traditional suspension is solved. However, with the increase in the requirements for vehicle capacity and the requirements for vehicle stability, safety, and comfort, especially for storage and transportation equipment with large load changes, how to ensure that the vehicle attitude adjustment speed is consistent when the vehicle is empty or fully loaded? When the body height is adjusted, especially when it is fully loaded, the top-loaded goods are stable, how to achieve high...

AI Technical Summary

Problems solved by technology

However, with the increase in the requirements for vehicle capacity and the requirements for vehicle stability, safety, and comfort, especially for storage and transportation equipment with large load changes, how to ensure that the vehicle attitude adjustment speed is consistent when the vehicle is empty or fully loaded, and how to ensure that the vehicle When the body height is adjusted, especially when it is fully loaded, the top-loaded goods are stable, how to achieve high efficiency and energy saving of the system, and reduce efficiency loss have become technical difficulties that domestic vehicle manufacturers are facing and have not been able to effectively solve. Therefore, the development is based on load-sensitive The principle of modular car attitude adjustment system is particularly necessary

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