Shock Absorber Force Distribution Slot for Compact Suspension Packaging
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Solution Overview
Problem
Shock absorbers in vehicle suspension systems face challenges in withstanding high operational forces during vehicle cornering and braking, leading to increased cost, complexity, weight, and size, particularly in hybrid-electric vehicles, which can result in packaging difficulties and inefficient force distribution.
Innovation Solution
The design incorporates an elongated slot in the outer tube of the shock absorber to distribute forces across a larger area, allowing for thinner tubes and a simpler design, with a valve system that adjusts damping levels electronically based on road conditions and vehicle dynamics, reducing the overall size and weight while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tube thickness and material quality are increased to withstand high operational forces, then strength and reliability are improved, but cost, weight, and complexity increase
Solution Approach 1:
The shock absorber is divided into multiple functional chambers (compression chamber, rebound chamber, reservoir chamber) separated by pistons and valves. This segmentation allows forces to be distributed and managed in different zones, enabling the use of thinner tube walls while maintaining overall structural strength through strategic force distribution across multiple components.
Solution Approach 2:
Different sections of the shock absorber have different structural characteristics optimized for their specific functions. The tube wall thickness, material properties, and structural reinforcement are varied locally based on the specific force requirements of each chamber, rather than uniformly thickening the entire structure. This allows strength to be concentrated where needed while reducing weight in less critical areas.
2Reliability
If additional components are added to withstand forces and control fluid flow, then reliability and force management are improved, but device complexity and cost increase
Solution Approach 1:
The valve system performs multiple functions: it controls fluid flow between chambers, manages force distribution, regulates damping characteristics, and maintains pressure balance. By consolidating these functions into an integrated valve assembly rather than separate components, the design achieves high reliability while controlling complexity through functional integration.
Solution Approach 2:
Multiple functional elements (pistons, valves, seals, and chambers) are merged into a compact integrated assembly where components work together in a coordinated manner. This merging reduces the number of separate parts that would need to be manufactured, assembled, and maintained, thereby reducing overall system complexity while maintaining reliable force management capabilities.
3Strength
If shock absorber size is increased to accommodate stronger components, then strength and force capacity are improved, but packaging space and vehicle integration become difficult
Solution Approach 1:
The shock absorber employs a nested configuration where the rebound chamber and compression chamber are arranged concentrically around a central axis, with the reservoir chamber nested at one end. This nested arrangement allows multiple functional chambers to occupy overlapping spatial volumes, maximizing force capacity within a compact overall envelope that fits vehicle packaging constraints.
Solution Approach 2:
The design transitions from a simple linear extension to a three-dimensional concentric arrangement of chambers. By utilizing radial space and vertical stacking of functional zones rather than only linear extension, the shock absorber achieves high force capacity through optimized spatial utilization in multiple dimensions, reducing the overall volume required while maintaining strength.
4Adaptability or versatility
If electronic valve control is added to adjust damping levels, then adaptability and ride comfort are improved, but device complexity and cost increase
Solution Approach 1:
The shock absorber incorporates an electronically controlled valve that dynamically adjusts damping characteristics in real-time based on vehicle conditions. This dynamic adaptability allows the system to optimize performance for different driving scenarios (comfort, sport, off-road modes) while the electronic control integrates with the vehicle's existing sensor and control systems, managing complexity through standardized interfaces rather than isolated complex mechanisms.
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 effectively manages operational forces, reduces the size and weight of the shock absorber, and continuously adjusts damping levels for improved ride comfort and handling, addressing the limitations of existing shock absorber designs.
Implementation Method 1
The elongated slot distributes forces of internal components during operation of the shock absorber
Implementation Method 2
A valve system that adjusts damping levels electronically based on road conditions and vehicle dynamics
Implementation Method 3
A piston is slidably disposed in the inner tube. The piston divides the inner volume of the inner tube into a rebound working chamber and a compression working chamber
Data Source
Figure 1
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AI summary
A shock absorber (10) for a suspension system of a vehicle includes an intermediate tube (22) on an inner tube (12) defining an intermediate chamber (24) between the inner tube and the intermediate tube. The shock absorber includes an outer tube (26) and the inner tube and the intermediate tube are in the outer tube. The outer tube defines a reserve chamber (28) between the outer tube and the intermediate tube. A valve (30) fluidly connects the intermediate chamber and the reserve chamber. An elongated slot (32) is in the outer tube between the valve and the reserve chamber.