Nested Piston Shock Absorber for Progressive Jounce Damping
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Solution Overview
Problem
Standard shock absorbers often 'bottom out' during severe off-road driving conditions, leading to jarring impacts due to limited damping force stages in existing jounce control systems.
Innovation Solution
A multi-stage jounce control shock absorber system with an elongated housing containing a damping medium, a primary piston assembly, and secondary and tertiary piston assemblies, which progressively increase damping force as compression distance increases, utilizing valve assemblies and restoration springs to regulate damping medium flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard shock absorber is used, then the structure is simple and cost-effective, but it bottoms out during severe off-road driving conditions causing jarring impacts
Solution Approach 1:
The shock absorber is divided into multiple independent piston assemblies (primary, secondary, tertiary) that operate in sequence. Each piston assembly functions as an independent damping stage, allowing the system to provide progressive damping force increases without requiring a completely complex redesign of the entire shock absorber structure.
Solution Approach 2:
The patent employs a nested configuration where the secondary piston assembly is positioned within the primary piston assembly, and the tertiary piston assembly is positioned within the secondary piston assembly. This nested arrangement allows multiple damping stages to be integrated in a compact form factor while maintaining structural efficiency.
2Reliability
If a jounce control shock absorber with single-stage elevated damping force is used, then the bottoming out condition is partially mitigated, but the effectiveness is limited due to only one stage of elevated damping force
Solution Approach 1:
The shock absorber employs dynamic damping force adjustment through multiple piston assemblies that activate at different compression distances. The damping force is not static but dynamically increases in three distinct stages as the suspension compresses, with each piston assembly providing elevated damping force at progressively greater compression distances.
Solution Approach 2:
The patent changes the damping force parameter progressively through three distinct stages by engaging different piston assemblies. Each piston assembly provides a different level of damping force, creating a stepped parameter change that adapts to varying severity of road irregularities and prevents bottoming out under extreme conditions.
3Reliability
If multiple piston assemblies are added to provide multi-stage damping force, then the damping effectiveness is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple piston assemblies into a single integrated shock absorber structure where the primary, secondary, and tertiary piston assemblies work together as a unified system. The valve assemblies and damping medium flow paths are combined to create a coordinated multi-stage damping mechanism that achieves complex damping behavior without proportionally increasing overall system complexity.
Solution Approach 2:
Each piston assembly serves multiple functions: providing damping force, regulating fluid flow through integrated valve assemblies, and contributing to the progressive damping stages. This multi-functionality reduces the need for separate components for each function, thereby managing complexity while achieving reliable multi-stage damping performance.
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 system effectively reduces the likelihood of 'bottoming out' by sequentially increasing damping force, providing improved shock absorption and ride comfort during extreme driving conditions.
Implementation Method 1
an elongated housing containing a damping medium, a moveable outer piston assembly disposed within the housing and a movable inner piston assembly disposed at least partially within the outer piston assembly
Implementation Method 2
An inner restoration spring may also be disposed in the outer piston assembly recessed cavity and configured to provide an expansive force on the inner piston assembly. An outer restoration spring may also be provided in the elongated housing to provide an expansive force on the outer piston assembly.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A jounce control damping system with an elongated housing containing a damping medium, a primary piston assembly, a moveable outer piston assembly, and a movable inner piston assembly disposed at least partially within the outer piston assembly. The primary piston assembly provides a first compression damping force. The inner piston engages the primary piston assembly and provides a second compression damping force when moved in a compression direction. After the inner piston assembly moves a given distance, the outer piston assembly is moved in the compressive direction and provides a third compression damping force.