Leaf Valve Structure with Recessed Depression for Adsorption Control
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Solution Overview
Problem
The existing damping valve structures in hydraulic shock absorbers experience noise generation and unstable damping force characteristics due to high surface adsorption forces between the valve seat and leaf, especially at low temperatures where fluid viscosity is high, leading to sudden lifting of the leaf and variations in cracking pressure.
Innovation Solution
A leaf valve structure with an annular valve seat and a leaf seated under elastic support, featuring recessed depression portions on the valve seat to reduce surface adsorption forces, allowing for controlled lifting and stable operation even with high viscosity fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the smoothness of the valve seat is improved to reduce fluid film formation, then the sealing performance is improved, but the surface adsorption force increases causing the leaf valve to adhere to the valve seat
Solution Approach 1:
The invention applies different surface properties to different regions of the valve seat. The crown portion maintains high smoothness for sealing, while the peripheral portion has lower smoothness to reduce adsorption force. This local differentiation allows the system to achieve both good sealing and easy valve opening.
Solution Approach 2:
The valve seat is divided into two distinct regions: a crown portion with high smoothness for sealing and a peripheral portion with lower smoothness for reducing adsorption. This segmentation allows each region to fulfill its specific function without compromising the other.
2Reliability
If the surface adsorption force between valve seat and leaf is high, then the sealing is improved, but the cracking pressure increases and causes sudden leaf lifting
Solution Approach 1:
By creating different surface smoothness levels in different regions of the valve seat, the invention achieves both strong sealing at the crown portion and reduced adsorption at the peripheral portion, enabling smooth valve opening without sudden lifting.
3Force
If the viscosity of the working fluid is high at low temperatures, then the damping force increases, but the cracking pressure variation increases causing unstable damping characteristic
Solution Approach 1:
The differentiated surface smoothness creates more consistent adsorption characteristics across the valve seat, reducing cracking pressure variation and stabilizing damping force characteristics even when fluid viscosity changes with temperature.
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 solution effectively reduces the impact of fluid viscosity on cracking pressure, ensuring quiet and stable damping force characteristics by promoting controlled lifting of the leaf valve, thus enhancing the responsiveness and stability of the hydraulic shock absorber.
Implementation Method 1
When a smoothness of the valve seat is improved due to improvements in processing precision, the leaf valve adheres to the crown portion of the valve seat with a great surface adsorption force
Implementation Method 2
a leaf that is seated on the valve seat under a predetermined elastic supporting force against a pressure of a working fluid
Data Source
AI summary
A leaf valve structure according to this invention comprises an annular valve seat, and a leaf that is seated on the valve seat under a predetermined elastic supporting force against a pressure of a working fluid on an inner side of the valve seat. A recessed depression portion having an opening portion on both an inner periphery of the valve seat and a seating surface of the leaf is formed in the valve seat, thereby creating a site where the pressure of the working fluid on the inner side of the valve seat can act more easily on a seating surface between the valve seat and the leaf valve. Accordingly, an effect of a surface adsorption force applied to the leaf valve by the valve seat on a cracking pressure can be suppressed, and as a result, the leaf valve can be lifted under a stable cracking pressure.