Integrated Piston Compensation for Hydraulic Shock Absorber Inertia
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Solution Overview
Problem
Existing hydraulic shock absorbers for vehicles suffer from delayed response and increased weight and maintenance costs due to external compensation cups, which affect ride comfort and balance.
Innovation Solution
A vibration damping device comprising two cartridges with integrated tubular bodies, pistons, and orifices for fluid bleeding, featuring movable or elastically deformable partitions for compressible fluid chambers within the cartridges, eliminating the need for external cups and optimizing fluid flow control for reduced inertia and production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external compensation cup is used to absorb volume variations and provide elastic return, then the shock absorber can handle fluid displacement and volume changes, but the device complexity and weight increase
Solution Approach 1:
The patent combines the compensation chamber and elastic return means directly within the piston assembly, eliminating the need for a separate external compensation cup. The piston itself incorporates both the compression chamber and compensation chamber, with the elastic element integrated into the piston structure, thereby reducing device complexity while maintaining volume compensation capability.
Solution Approach 2:
The compensation chamber is nested within the piston structure, with the elastic return means positioned inside the piston assembly. The partition divides the piston interior into compression and compensation chambers, creating a nested configuration that reduces overall device complexity and eliminates external components.
2Adaptability or versatility
If an external compensation cup with compressible fluid is used, then volume variations are absorbed, but the response delay increases due to elastic response opposition
Solution Approach 1:
By merging the compensation chamber directly into the piston assembly and positioning it adjacent to the compression chamber, the patent enables immediate volume compensation during piston movement. The direct coupling eliminates the time delay associated with fluid transfer through external connections, allowing the compressible fluid to respond instantaneously to volume changes.
Solution Approach 2:
The partition acts as an intermediary structure that directly couples the compression chamber and compensation chamber within the piston. This internal partition allows rapid fluid displacement between chambers without the delays introduced by external connections, maintaining fast response while providing volume compensation.
3Adaptability or versatility
If an external compensation cup is used, then volume compensation is achieved, but the weight of the fork increases due to non-suspended mass
Solution Approach 1:
The patent merges the compensation chamber and elastic return means into the piston assembly, eliminating the separate external compensation cup. This integration removes the additional weight that would be added to the fork, while still providing the necessary volume compensation function through the integrated piston structure.
Solution Approach 2:
The patent extracts the compensation function from the external fork assembly and relocates it directly into the piston. By taking out the external compensation cup and integrating its function within the piston, the patent reduces the non-suspended mass of the fork while maintaining volume compensation capability.
4Adaptability or versatility
If an external compensation cup is used, then volume compensation is provided, but production and maintenance costs increase
Solution Approach 1:
The patent combines multiple functions (compression, compensation, and elastic return) into a single integrated piston assembly. This reduces the total number of components that need to be manufactured and assembled, thereby lowering production costs while maintaining volume compensation capability.
Solution Approach 2:
The piston assembly is designed as a multi-functional component that simultaneously provides compression damping, volume compensation, and elastic return. This universal design eliminates the need for separate dedicated components for each function, reducing manufacturing complexity and cost while maintaining all necessary functions.
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 balanced and comfortable ride by reducing inertia, minimizing maintenance, and lowering production costs through a structurally simple and cost-effective design that enhances hydraulic response efficiency.
Implementation Method 1
The motion of the piston causes the bleeding of fluid through the calibrated orifices of the piston from the high-pressure chamber toward the low-pressure chamber
Implementation Method 2
in the second one of such chambers of the cup there is compressible fluid, which defines the means for the elastic return in extension of the shock absorber
Data Source
AI summary
A vibration damping device for hydraulic shock absorbers for vehicles, having two cartridges, each associated with a shock-absorber integrated in a component of a vehicle, and each comprising a tubular body, with a piston that forms two chambers with variable volumes of incompressible fluid, a first compression chamber, and a second extension chamber. Each piston is carried by a stem exiting from an end of the tubular body and associated with part of the shock-absorber. The piston is provided with bleeding orifices for fluid bleeding. Flow control and throttling for the orifices are provided.