Telescopic Passive Damper Assembly for Compact Stroke Packaging
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Solution Overview
Problem
The increasing complexity of vehicle bodies and suspension systems has made the length of shock absorbers or damper assemblies critical, affecting installation, space, and cost, while existing damper designs are often cumbersome and inefficient.
Innovation Solution
A damper assembly comprising a monotube damper and a twintube damper in a telescopic configuration, featuring a seal that selectively blocks fluid flow based on the axial position of the components, allowing for a compact design with maximized stroke and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional twin-tube damper design is used, then the damper provides adequate damping performance, but the compressed length becomes excessive and occupies more space
Solution Approach 1:
The patent applies nesting by placing the monotube damper inside the twintube damper structure. The inner tube of the twintube damper serves as the outer tube of the monotube damper, creating a nested configuration that reduces overall compressed length while maintaining the damping functions of both damper types
Solution Approach 2:
The patent merges the monotube and twintube damper designs into a single integrated telescopic damper assembly. This combination allows the system to achieve compact dimensions when compressed while providing adequate stroke length and damping performance, resolving the space-performance contradiction
2Duration of action of moving object
If the damper stroke is maximized for better suspension travel, then the extended length increases, but the compressed length should remain compact for space efficiency
Solution Approach 1:
The telescopic configuration allows the damper to dynamically change its effective length. When extended, the inner tube telescopes out to provide maximum stroke length for suspension travel. When compressed, the tubes telescope in to achieve a compact profile, dynamically adapting the length based on operational requirements
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 proposed damper assembly achieves a 20% reduction in compressed length compared to conventional twin-tube dampers, while maintaining similar extended length, and provides improved damping performance with reduced complexity and cost.
Implementation Method 1
a seal configured to selectively block fluid flow through one of the twintube passage or the base passage and based on an axial position of the first tube relative to the second tube
Implementation Method 2
a first piston connected to the rod and slidably disposed within the first tube
Implementation Method 3
a second piston connected to an axial end of the first tube dividing an interior of the third tube into an upper twintube chamber and a lower twintube chamber
Data Source
AI summary
A damper assembly comprises a monotube damper and a twintube damper in a telescopic configuration. A first piston is connected to a rod and is slidably disposed within a first tube. A second tube and a third tube are each disposed coaxially around the monotube damper, with the third tube disposed within the second tube and defining an annular chamber therebetween. A second piston is connected to an axial end of the first tube dividing an interior of the third tube into an upper chamber and a lower chamber. The second piston defines a twintube passage providing fluid communication therethrough. A base member defines a base passage providing fluid communication between the lower chamber and the annular chamber. A seal selectively blocks fluid flow through the twintube passage or the base passage and based on an axial position of the first tube relative to the second tube.