Hydraulic Stop Shock Absorber With Load-Adaptive Damping Passages
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Solution Overview
Problem
The existing hydraulic shock-absorbers have a fixed damping characteristic curve that does not adjust with varying static load conditions, which can be a disadvantage in applications like vehicle suspension where load changes significantly.
Innovation Solution
A hydraulic shock-absorber with a hollow cylindrical body for the auxiliary piston, featuring adjustable passages that open or close based on static load and piston position, allowing the damping characteristic curve of the hydraulic stop member to change accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hydraulic stop member has a fixed damping characteristic curve, then the structure is simple, but the damping performance cannot adapt to varying static load conditions
Solution Approach 1:
The patent applies the dynamics principle by making the damping characteristic curve adjustable through a sliding member that can change position based on static load conditions. The sliding member moves along the rod to open or close passages, dynamically adapting the damping behavior to match varying load requirements rather than maintaining a fixed characteristic curve.
Solution Approach 2:
The patent implements parameter changes by varying the opening area of passages through the movement of the sliding member. As the sliding member shifts position, it changes the effective area of the passages, thereby adjusting the damping characteristic curve to suit different static load conditions on the suspension system.
2Ease of operation
If passages are always open for fluid communication, then damping fluid flow is unrestricted, but damping control during compression stroke is reduced
Solution Approach 1:
The patent applies the self-service principle by designing a passive control mechanism where the sliding member automatically opens or closes passages based on the average position of the piston and static load conditions. The system self-regulates the damping fluid flow without requiring external control systems, using the inherent mechanical conditions to dictate passage opening or closing.
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 allows for dynamic adjustment of damping levels based on vehicle load, providing optimal damping performance in both low and high load conditions, enhancing the shock-absorber's ability to handle varying loads effectively.
Implementation Method 1
elastic means and damping means configured to cooperate with the sliding member in order to move the sliding member depending on the static load acting on the vehicle suspension and on the average position of the piston of the shock-absorber
Implementation Method 2
elastic means and damping means configured to cooperate with the sliding member in order to move the sliding member depending on the static load acting on the vehicle suspension
Implementation Method 3
Axial channels are provided on the inner surface of the side wall of the cup-shaped body to allow the damping fluid to flow axially out of the working chamber when the auxiliary piston slides in the working chamber towards the bottom wall of the cup-shaped body. The axial channels have a cross-section with an area that decreases continuously along this axis towards the bottom wall of the cup-shaped body, so that the damping effect produced by the hydraulic stop member on the rod of the shock-absorber during the compression stroke of the shock-absorber increases continuously
Data Source
AI summary
A shock-absorber has an outer cylindrical tube, an inner cylindrical tube, a rod, a main piston and a hydraulic stop member received in a compression chamber and operating during an end section of the compression stroke of the shock-absorber to cause an increase in the hydraulic damping force. The hydraulic stop member has a cup-shaped body mounted in the compression chamber and a first auxiliary piston which is mounted on a cylindrical body rigidly connected to the main piston and is configured to sealingly slide in the cup-shaped body during an end section of the compression stroke, encompassing a working chamber with the cup-shaped body. A sliding member is slidably received inside the cylindrical body for opening or closing at least one first passage of the cylindrical body through which oil flows from the working chamber of the cup-shaped body to the compression chamber of the shock-absorber.