Perforated Damper Piston With Outer Sleeve for Low-Friction Damping
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Solution Overview
Problem
Conventional damper assemblies face challenges in providing optimal ride comfort and vehicle balance due to high inertia and friction during compression and rebound strokes, and existing designs are complex and costly to produce.
Innovation Solution
The damper assembly features a piston with a first and second portion defining a perforation, equipped with entry valves and an expansion valve, which allows fluid flow during strokes and reduces friction through an outer sleeve design, enabling independent tuning for improved ride comfort and vehicle handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional damper assemblies use traditional piston designs with solid structures, then structural strength is maintained, but inertia and friction increase during compression and rebound strokes
Solution Approach 1:
The piston is divided into a first portion and a second portion spaced from one another, creating a perforated structure that reduces mass while maintaining functional integrity. This segmentation allows the piston to achieve lower inertia for smoother stroke transitions while preserving the necessary structural strength through the distributed design.
Solution Approach 2:
The piston incorporates a perforation extending between the first and second portions, creating a porous-like structure that reduces material usage and inertia. This perforated design maintains sufficient strength while enabling reduced friction and improved fluid flow characteristics during operation.
2Ease of manufacture
If conventional damper assemblies use simple piston designs, then manufacturing cost is reduced, but ride comfort and vehicle balance tuning capability are limited
Solution Approach 1:
The damper assembly incorporates an adjustable expansion valve that allows dynamic tuning of damping characteristics. This adjustable component enables variation of tuning parameters to optimize ride comfort and vehicle balance for different applications while maintaining a relatively simple overall structure that remains cost-effective to manufacture.
Solution Approach 2:
The expansion valve design allows for adjustment of critical damping parameters, enabling the same basic piston structure to be tuned for different performance requirements. This parameter adjustability provides versatility in ride comfort and vehicle balance tuning without requiring completely different piston designs for each application.
3Reliability
If conventional damper assemblies use traditional sealing designs, then fluid sealing is achieved, but friction increases during stroke transitions
Solution Approach 1:
An outer sleeve is introduced as an intermediary component between the piston and the fluid chamber walls. This sleeve provides the sealing function while being spaced from the piston portions, thereby reducing direct friction contacts. The outer sleeve acts as a mediator that maintains fluid sealing integrity while minimizing friction during compression and rebound stroke transitions.
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 design reduces inertia and friction, enhancing smooth transitions between compression and rebound strokes, while allowing for cost-effective production and improved vehicle balance and ride comfort through adjustable tuning parameters.
Implementation Method 1
An outer sleeve, having an exterior surface and an interior surface, extends about the center axis between the first portion and the second portion covering the first perforation
Implementation Method 2
The piston includes a first entry valve and a second entry valve located in the piston and coupled to the piston for limiting the working fluid from flowing into the piston
Implementation Method 3
defining a first perforation extending between the first portion and the second portion for allowing a working fluid to flow through the piston during a compression stroke and a rebound stroke
Implementation Method 4
reduce friction in the damper assembly for a smooth transition between compression and rebound strokes
Data Source
AI summary
A damper assembly comprises a housing disposed on a center axis and defining a fluid chamber for containing a working fluid. A piston is slidably disposed in the fluid chamber dividing the fluid chamber into a compression chamber and a rebound chamber. A piston rod attaches to the piston for moving the piston in the housing. The piston includes a first portion and a second portion defining a first perforation. An outer sleeve has an exterior surface and an interior surface and extends between the first portion and the second portion covering the first perforation. The piston includes a first entry valve and a second entry valve located in the piston and coupled to the piston for limiting the working fluid from flowing into the piston with the first entry valve being disposed adjacent the first portion and the second entry valve being disposed adjacent the second portion.