Flow Control Valve Throttle Layout for Reduced Hydraulic Fluid Forces
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Solution Overview
Problem
Existing flow control valves in hydraulic circuits of construction machines suffer from deteriorated displacement characteristics due to fluid forces, making it difficult to control the opening amount of the main valve throttle and fluid forces effectively, while also facing challenges in reducing the impact of fluid forces and manufacturing the valves in a smaller size.
Innovation Solution
The flow control valve is designed with a main valve throttle configured by a lateral hole and a groove portion, where the groove portion is formed as a communicating passage with the lateral hole in the axial direction, allowing hydraulic fluid to change the direction of the jet flow passing through the main valve throttle, thereby reducing fluid forces and improving displacement characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lateral hole is used as the main valve throttle, then the opening amount can be controlled, but fluid forces act on the main valve in the valve opening direction which deteriorates displacement characteristics
Solution Approach 1:
A groove portion is introduced as an intermediary structure between the lateral hole and the main valve body. This groove portion receives the jet flow from the lateral hole and redirects it, serving as a mediator that transforms the harmful lateral fluid forces into useful axial flow direction, thereby reducing the adverse impact on main valve displacement characteristics
Solution Approach 2:
The invention converts the harmful fluid forces generated by the lateral hole jet flow into a beneficial effect. By designing the groove portion to redirect the jet flow in the axial direction, the previously harmful lateral forces are transformed into axial flow that supports the main valve operation, turning the adverse fluid dynamics into a useful characteristic
2Productivity
If the main valve is displaced in the valve closing direction to reduce opening amount, then flow rate control is achieved, but the jet flow direction changes causing repeated interaction that rapidly displaces the main valve and deteriorates displacement characteristics
Solution Approach 1:
The groove portion acts as a stable intermediary structure that maintains consistent flow redirection regardless of the main valve's displacement position. This mediator ensures that the jet flow is always redirected in the axial direction, preventing the repeated interaction and instability that occurs when the valve closes, thereby stabilizing the displacement characteristics throughout the entire range of motion
3Volume of moving object
If the valve size is reduced to meet compact machine requirements, then space efficiency improves, but controlling the opening amount and fluid forces becomes more difficult
Solution Approach 1:
The invention adds a new dimensional element by introducing the groove portion that extends in the axial direction. This axial dimension provides an additional degree of freedom for controlling fluid flow without increasing the lateral dimensions of the valve, enabling precise control of opening amount and fluid forces within a compact overall size
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces fluid forces on the main valve, allowing for slower displacement during closure and improved control over the opening amount of the main valve throttle and fluid forces, while enabling the valve to be manufactured in a smaller size without increasing manufacturing costs.
Implementation Method 1
the groove portion is formed as a communicating passage communicating with the lateral hole in the axial direction of the main valve between the housing and an outer periphery of the main valve... allowing hydraulic fluid to change the direction of the jet flow passing through the main valve throttle
Data Source
AI summary
A main valve throttle (53) of a main valve (43) is configured by a lateral hole (53A) communicating an inlet side flow passage (25) and an outlet side flow passage (27) through the inside of the main valve (43) and a groove portion (53C) communicating the inlet side flow passage (25) and the outlet side flow passage (27) via an outer peripheral portion of the main valve (43). The groove portion (53C) is located such that a hydraulic fluid spurting from the groove portion (53C) changes the direction of a flow of a hydraulic fluid spurting from the lateral hole (53A). In this case, the direction of a flow of a hydraulic fluid F2 spurting from the lateral hole (53A) can be changed to approach the direction parallel to the center axis of the main valve (43) by a hydraulic fluid F1 spurting from the groove portion (53C).