Hydraulic Damping Valve With One-Way Flow for Multi-Phase Damping
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Solution Overview
Problem
Hydraulic dampers used in helicopter rotor blades face challenges in effectively damping undesirable movements due to limitations in existing damping valve designs, which fail to provide optimal damping across various operational phases and frequencies.
Innovation Solution
A damping valve design featuring a valve element with axially extending passages and a one-way valve configuration, along with a spring biasing mechanism, allows controlled fluid flow between inlet and outlet chambers, providing four distinct damping phases and minimizing lateral forces to enhance damping efficiency and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spring-loaded valve element is used between inlet and outlet chambers, then the valve structure is simple, but the damping performance across various operational phases and frequencies is insufficient
Solution Approach 1:
The valve element is divided into multiple functional sections: a first portion with axially extending passages for fluid communication, a second portion with a valve surface for seating, and a third portion for spring engagement. This segmentation allows each section to perform its specific function optimally, improving damping performance across different operational phases while maintaining a manageable overall structure.
Solution Approach 2:
The valve element is designed to move axially dynamically between fully closed, partially open, and fully open positions based on pressure differential and spring force. The axially extending passages in the first portion enable controlled fluid flow during transition phases, providing dynamic damping adjustment that responds to varying operational conditions.
2Adaptability or versatility
If the valve element is designed with multiple passages and one-way valve, then the damping control across different phases is improved, but the manufacturing complexity increases
Solution Approach 1:
Multiple functional features are merged into a single integrated valve element: the axially extending passages, the valve surface, the spring engagement features, and the one-way valve are all incorporated into one component. This merging reduces the number of separate parts needing assembly while providing sophisticated multi-phase damping control, actually simplifying the overall manufacturing process despite the increased functionality.
3Reliability
If the valve element engages directly with the housing valve seat, then the sealing is effective, but lateral forces cause increased wear
Solution Approach 1:
The axially extending passages in the first portion of the valve element act as intermediaries that guide fluid flow and distribute pressure more evenly during valve operation. This intermediary structure helps reduce concentrated lateral forces on the valve seat engagement point, thereby reducing wear while maintaining effective sealing through the second portion's valve surface.
4Speed
If hydraulic fluid flows directly between inlet and outlet chambers, then the response speed is fast, but the damping effect is insufficient
Solution Approach 1:
Different regions of the valve element provide different flow characteristics: the axially extending passages in the first portion allow relatively fast fluid communication, while the nozzle formed by the engagement between the second portion and housing valve seat provides restricted flow for strong damping. This local differentiation of flow quality enables both fast response and effective damping in different operational phases.
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
The design achieves improved damping performance across different operational phases and frequencies, reducing wear and enhancing the system's responsiveness and longevity by optimizing fluid flow and pressure distribution.
Implementation Method 1
A spring element is mounted within the valve housing for biasing the valve element into engagement with the housing valve seat
Implementation Method 2
A one-way valve is located in the at least one second passage and configured to allow flow in the at least one second passage in a direction from the inlet chamber to the bore chamber, but to block flow in the at least one second passage in a direction from the bore chamber to the inlet chamber
Implementation Method 3
Depending on the relative pressures existing in the inlet and outlet chambers, the valve element may open to allow hydraulic fluid to pass through a nozzle formed between the valve element and its housing
Implementation Method 4
The flow of hydraulic fluid through passages in the valve provides a damping effect
Data Source
AI summary
A damping valve for a hydraulic damper (D) comprises a valve housing comprising an inlet chamber and an outlet chamber. A housing valve seat is arranged between the inlet chamber and the outlet chamber. A valve element having a cylindrical first portion is slidably received in a cylindrical bore of the valve housing and a second portion has a valve surface for selectively engaging and disengaging the housing valve seat to allow passage of hydraulic fluid between the inlet chamber and the outlet chamber. A spring element is mounted within the valve housing for biasing the valve element into engagement with the housing valve seat. The bore of the valve housing has a closed end defining a bore chamber between an end of the first portion of the valve element and the closed end of the bore. A first passage provides fluid communication between the bore chamber and the inlet chamber.