Shock Absorber Valve Disk Support Against Oil-Induced Deformation
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Solution Overview
Problem
The use of low-rigidity disks in damping force adjustable shock absorbers can lead to deformation and reduced durability due to hydraulic oil entry between the disk and adjacent disks under increased pressure, particularly during extension and compression strokes.
Innovation Solution
Incorporating a deformation prevention portion, such as a backup disk or check valve, to support the low-rigidity disk and shift its support point, thereby increasing its bending rigidity and preventing deformation by redirecting hydraulic oil flow, and using structural features like cutouts and elongated holes to manage pressure and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a low-rigidity disk is used as a disk seated on a seat portion of a main valve to achieve soft damping characteristics, then the main valve opens at earlier timing allowing low valve characteristic damping force, but hydraulic oil enters between the low-rigidity disk and adjacent disks under increased pressure causing deformation and reduced durability
Solution Approach 1:
A deformation prevention portion is introduced as an intermediary element between the low-rigidity disk and the adjacent disk. This mediator prevents direct contact between the low-rigidity disk and hydraulic oil while maintaining the disk's flexibility for soft damping characteristics. The deformation prevention portion acts as a barrier that eliminates the harmful effect of oil entry without compromising the low-rigidity disk's ability to provide soft damping force.
Solution Approach 2:
The deformation prevention portion is positioned in advance to prevent hydraulic oil from reaching the low-rigidity disk before pressure increases cause potential deformation. By providing this protective structure beforehand, the system prevents the harmful effect of oil entry and subsequent disk deformation, ensuring durability while maintaining the soft damping characteristics during extension and compression strokes.
2Reliability
If the low-rigidity disk is made more rigid to prevent deformation under pressure, then durability improves, but the main valve opening timing is delayed resulting in loss of soft damping characteristics
Solution Approach 1:
The valve mechanism is segmented into functionally distinct components: the low-rigidity disk for providing soft damping characteristics and the deformation prevention portion for ensuring durability. This segmentation allows each component to be optimized for its specific function - the low-rigidity disk remains flexible for early valve opening while the deformation prevention portion provides structural support to prevent oil entry and deformation, resolving the contradiction between rigidity and damping characteristics.
Solution Approach 2:
The deformation prevention portion serves as an intermediary that decouples the structural support function from the damping function. It provides the necessary rigidity to prevent oil entry and disk deformation without interfering with the low-rigidity disk's ability to flex and enable early main valve opening, thus maintaining soft damping characteristics while improving durability.
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 enhances the durability of the shock absorber by preventing deformation of the low-rigidity disk during increased pressure conditions, maintaining the damping force characteristics and extending the component's lifespan.
Implementation Method 1
a low-rigidity disk configured to be seated on the outer seat portion and having lower rigidity than the main valve
Implementation Method 2
upon an increase in a pressure in a cylinder upper chamber over a pressure in a compression-side back-pressure chamber
Data Source
AI summary
The present invention causes a low-rigidity disk to be supported by a backup disk (a deformation prevention portion), and therefore can prevent the low-rigidity disk from being deformed due to an inflow of hydraulic oil to between the low-rigidity disk and a disk adjacent thereto according to an increase in a pressure in a cylinder upper chamber during an extension stroke, and can improve the durability of the low-rigidity disk.