Telescopic Damper Assembly with Synchronous Piston Rod
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Solution Overview
Problem
The increasing complexity of vehicle bodies and suspension systems has made the length of shock absorber or damper assemblies critical, impacting installation and cost, with existing designs not effectively minimizing damper dimensions while maintaining stroke length.
Innovation Solution
A damper assembly design that includes a main tube with a fluid chamber divided into compression and rebound chambers, an external tube with a protrusion for a compensation chamber, and a piston rod that moves synchronously with the main tube, allowing for reduced length and cost-effective installation by utilizing a compensation chamber to adjust volume and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the damper assembly uses a conventional design with separate compensation mechanisms, then the stroke length can be maintained, but the overall length and complexity of the damper increases
Solution Approach 1:
The patent combines the compensation chamber with the external tube structure, where the external tube serves dual purposes as both a structural component and a compensation chamber housing. This merging of functions reduces the number of separate components and overall damper length while maintaining the necessary compensation volume for stroke length preservation.
Solution Approach 2:
The external tube is designed to serve multiple functions: it provides structural support, houses the compensation chamber, and works with the external piston to regulate fluid volume. This multi-functionality eliminates the need for separate compensation mechanisms, reducing complexity and length while maintaining performance.
2Length of moving object
If the damper assembly minimizes dimensions, then installation cost and complexity are reduced, but the stroke length may be compromised
Solution Approach 1:
The external piston is designed to move dynamically within the compensation chamber, adjusting the compensation volume based on the damper's operational state. This dynamic adjustment ensures that the stroke length is maintained accurately throughout the compression and rebound cycles, even as the overall damper dimensions are minimized.
Solution Approach 2:
The compensation chamber volume is made variable through the external piston's movement, allowing the system to adjust the effective volume to maintain consistent stroke length. This parameter change enables short dambers to achieve the same stroke length as longer conventional designs by optimizing fluid displacement dynamics.
3Ease of manufacture
If the damper assembly uses a simplified design, then manufacturing cost is reduced, but the ability to maintain stroke length may be affected
Solution Approach 1:
The damper is segmented into distinct functional zones: the main tube with compression and rebound chambers, the external tube with compensation chamber, and the external piston. This segmentation allows each component to be manufactured independently with standard tolerances, reducing overall manufacturing complexity and cost while maintaining precise stroke length through the coordinated function of segments.
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 design minimizes damper dimensions while maintaining stroke length, reducing vehicle body costs and improving installation efficiency by enabling synchronous movement and volume adjustment of the piston rod and main tube.
Implementation Method 1
The second compartment extends between the closed end and the external piston for containing a gas
Data Source
AI summary
A damper assembly comprises a main tube extending along a center axis between a first end and a second end defining a fluid chamber. A main piston is disposed in the fluid chamber dividing the fluid chamber into a compression chamber and a rebound chamber. A piston rod extends along the center axis coupled to the main piston. An external tube extends about the main tube and defines a compensation chamber therebetween. The external tube includes a protrusion extending radially inwardly from an opened end to abut the main tube. An external piston is located in the compensation chamber and coupled to the main tube, dividing the compensation chamber into a first compartment and a second compartment. The first compartment extends between the protrusion and the external piston for containing a working fluid. The second compartment extends between the closed end and the external piston for containing a gas.