Shock Absorber Damping Valve Preload for Stable Force Output
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Solution Overview
Problem
Conventional hydraulic shock absorbers with preload members for controlling damping force have complex structures and increased manufacturing steps, leading to sudden changes in damping force and noise due to the sudden opening of the opening and closing member.
Innovation Solution
A hydraulic shock absorber with a preload member featuring a ring-shaped portion and axis alignment portions that apply a preload to the opening and closing member, allowing for a simple structure and reduced manufacturing steps, thereby preventing sudden changes in damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opening and closing member that opens the channels by deforming under pressure of the fluid is used, then the damping force can be controlled, but the opening and closing member tends to suddenly open causing sudden changes in damping force and noise
Solution Approach 1:
A preload member is introduced to apply a preliminary opposing force (preload) to the opening and closing member before fluid pressure acts on it. This preliminary anti-action prevents the sudden opening of the member by counterbalancing the fluid pressure, thereby eliminating sudden changes in damping force and noise while maintaining reliable damping control.
2Object-generated harmful factors
If a preload member is provided to apply a preload to the opening and closing member, then sudden opening can be prevented, but the structure becomes complicated and manufacturing steps increase
Solution Approach 1:
The preload member is designed to perform multiple functions simultaneously: it applies preload to prevent sudden opening, maintains sealing between the opening and closing member and the channel forming part, and provides structural support. This multi-functionality reduces the need for separate components, simplifying the overall structure and reducing manufacturing steps.
Solution Approach 2:
The sealing function and preload application function are merged into a single preload member rather than using separate sealing elements and preload mechanisms. This integration simplifies the structure by reducing the number of parts and assembly steps while achieving both objectives of preventing sudden opening and maintaining sealing.
3Reliability
If a conventional preload member is used, then sudden opening can be prevented, but the structure becomes complicated and involves increased manufacturing steps
Solution Approach 1:
The invention extracts and eliminates unnecessary components from conventional preload member designs, retaining only the essential preload application and sealing functions in a simplified single-member structure. This extraction of excess complexity reduces manufacturing steps while maintaining the reliability of damping force stability.
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 provides a hydraulic shock absorber with a simple structure and reduced manufacturing steps, ensuring stable damping force generation and minimizing noise by gradually opening the valve plate under pressure, resulting in more linear damping characteristics.
Implementation Method 1
an opening and closing member configured to close the channel by covering the channel and open the channel by deforming under pressure of the fluid
Implementation Method 2
a preload member configured to apply a preload to the opening and closing member
Implementation Method 3
a damping force is generated by applying resistance to flow of liquid resulting from movement of the piston
Data Source
AI summary
The hydraulic shock absorber includes: a first cylinder containing fluid; a piston body including extension-side oil paths permitting flow of oil along with relative movement of the piston rod in the axial direction of the first cylinder; and an extension-side damping valve configured to open and close the extension-side oil paths of the piston body. The extension-side damping valve includes: a valve plate configured to close the extension-side oil paths by covering them and open them by deforming under pressure of oil; and a preload member configured to apply a preload to the valve plate. The preload member includes: a ring-shaped portion; and axis alignment portions configured to protrude from an outer periphery of the ring-shaped portion and contact the piston body to thereby perform axis alignment.