Proportional Valve Pilot Guide Deflects Jet Forces
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Solution Overview
Problem
Proportional pressure control valves used in hydraulic clutch systems are prone to malfunctions due to direct jet forces on the pilot valve, which can lead to neutral dynamic effects and safety issues, especially under increased safety engineering requirements.
Innovation Solution
Incorporating a guide mechanism within the connecting channel that deflects or atomizes the fluid stream, reducing jet forces on the pilot valve by using atomizer nozzles or deflection channels, and optionally providing a diffuser orifice to adapt to different pump pressure ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a throttle is provided in the connecting channel for the pilot valve, then the fluid stream can be controlled and pressure can be regulated, but high jet forces are applied to the pilot valve closing element causing malfunctions and neutral dynamic effects
Solution Approach 1:
A guide structure is introduced as an intermediary element between the throttle and the pilot valve closing element. This guide deflects the fluid stream so that it passes alongside the closing element rather than directly impacting it, thereby maintaining pressure control functionality while eliminating harmful jet forces that caused malfunctions
Solution Approach 2:
The high-velocity fluid stream that originally caused harmful jet forces on the closing element is redirected to serve a beneficial purpose: it is deflected to flow along the closing element surface, which can help maintain stable pressure control while preventing direct impact malfunctions. The harmful jet force is converted into a controlled flow pattern that supports reliable operation
2Stress or pressure
If the fluid stream is routed directly to the valve part after throttling, then pressure control is achieved, but jet forces directly strike the closing element leading to malfunctions in certain valve states
Solution Approach 1:
The guide structure serves as a mediator that intercepts the throttled fluid stream and redirects it. The guide is positioned to receive the fluid stream from the throttle and deflect it along a path that bypasses direct impact with the closing element, thereby eliminating the harmful jet forces while preserving pressure control
3Reliability
If a filter part is added to the throttle to prevent clogging, then dirt filtering is improved, but the device complexity increases
Solution Approach 1:
The filter part is merged with the throttle structure, forming an integrated component rather than a separate assembly. This combination allows the filter to be positioned upstream of the throttle opening, effectively preventing clogging while minimizing additional complexity by using a single integrated feature rather than multiple separate parts
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 solution prevents malfunctions by reducing jet forces on the pilot valve, ensuring reliable operation across various valve states and adapting to different pressure ranges, thus enhancing safety and performance in hydraulic clutch systems.
Implementation Method 1
a guide is oriented in the direction of the pilot chamber for the fluid stream. The fluid stream guided in the connecting channel is then deflected at least partly in the direction of the valve part by the guide
Implementation Method 2
The fluid stream directed at the valve part of the pilot valve can be deflected and/or can be atomized such that the jet forces no longer directly strike the closing element of the pilot control
Implementation Method 3
The connecting channel has a throttle in the direction of the pilot chamber of the pilot valve with its valve part. The fluid stream throttled in this way travels with high pressure
Implementation Method 4
The throttle, on its side facing away from the pilot chamber, is provided with a filter part for filtering out dirt in the fluid stream which otherwise could clog the throttle
Implementation Method 5
This valve part is spring-loaded against the action of the magnetic system in its closed position along the valve seat of the pilot chamber
Implementation Method 6
a spherical closing or valve part of the pilot valve which can be actuated by a conventional magnetic system, especially a proportional magnetic system
Data Source
AI summary
A valve, particularly a proportional pressure control valve for controlling fluid flows, includes a valve housing (10) having at least three fluid-conducting connections in the form of a pump connection (P), a use connection (A) and of a tank (T) connection. To connect the pump connection (T) to the use connection (A) and the use connection (A) to the tank connection (T), a control piston (18) can be guided in a longitudinally displaceable manner inside the valve housing (10). This control piston is provided for establishing a fluid-conducting connection between at least one of the connections (P) and a pilot chamber (20) of a pilot valve (22) having a connecting channel (24). A valve part (40) of the pilot valve (22) is guided in the pilot chamber (20) in a longitudinally displaceable manner. The connecting channel (24) has a throttle in the direction of the pilot chamber (20) of the pilot valve (22) with its valve part. A guiding device (38) oriented toward the pilot chamber (20) and provided for guiding the fluid flow is provided next to the throttle to divert the fluid flow, conveyed inside the connecting channel (24) and flowing toward the valve part (40), at least partially away from this valve part.