Multistage Shock Absorber for Progressive Bottom-Out Damping
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Solution Overview
Problem
Standard shock absorbers are limited in their ability to effectively prevent bottoming out during severe driving conditions due to a lack of multiple stages of elevated damping force, leading to jarring impacts.
Innovation Solution
A multistage damping system with a primary, secondary, and tertiary piston assembly that progressively increases damping force as the shock absorber approaches bottoming out, utilizing a novel jounce control mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard shock absorber is used, then the structure is simple, but it bottoming out during severe driving conditions, producing jarring impacts
Solution Approach 1:
The shock absorber is divided into multiple piston assemblies (primary, secondary, tertiary) that operate independently at different compression stages. Each piston assembly has its own damping characteristics, allowing the system to provide progressive resistance without requiring a completely complex redesign of the entire shock absorber structure.
Solution Approach 2:
The patent implements 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 within a compact structure, preventing bottoming out while maintaining reasonable device complexity.
2Reliability
If a jounce control shock absorber with single stage elevated damping force is used, then bottoming out is partially prevented, but the system is limited in effectiveness due to providing 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 stages. The primary piston provides initial damping, the secondary piston engages at intermediate compression to provide elevated damping force, and the tertiary piston activates near bottoming out to provide a second stage of elevated damping force. This dynamic progression enhances adaptability to varying compression conditions.
Solution Approach 2:
The patent changes the damping force parameter progressively through different piston assemblies based on compression distance. Each piston assembly is designed with specific orifice configurations and spring characteristics that create distinct damping force levels, allowing the system to adapt to different driving conditions and provide appropriate resistance at each stage of compression.
3Reliability
If multiple piston assemblies are added to provide multistage damping force, then bottoming out prevention is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple piston assemblies into a single integrated shock absorber structure. The primary, secondary, and tertiary piston assemblies are combined within a common housing and damping medium system, allowing them to work together as a unified multistage damping system rather than separate components, thereby managing device complexity while maintaining bottoming out prevention effectiveness.
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 multistage damping system significantly reduces the likelihood of bottoming out by sequentially increasing damping force, providing enhanced vehicle stability and comfort during extreme driving conditions.
Implementation Method 1
an elongated housing containing a damping medium, an axially moveable primary piston assembly arranged in the housing
Implementation Method 2
When the valve assembly engages the orifice, it regulates the flow of damping medium to provide a greater compressive damping force
Implementation Method 3
A pressure spring is arranged between the bottom of the guide opening and the slide gate, which applies a spring force to the slide gate
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Multistage damping system with an elongated housing containing a damping medium, an axially moveable primary piston assembly arranged in the housing comprising a primary piston and a valve assembly, an axially moveable secondary piston assembly, and an axially moveable tertiary piston assembly having a recessed cavity formed therein, wherein said secondary piston assembly is disposed within said recessed cavity. The axially moveable secondary piston may have an orifice disposed in a location to engage the valve assembly when the primary piston assembly is moved in a compressive direction beyond a particular compressive movement distance. When the valve assembly engages the orifice, it regulates the flow of damping medium to provide a greater compressive damping force when said primary piston assembly and said secondary piston assembly are moved beyond the particular compressive movement distance. The tertiary piston assembly is disposed and moveable within a second housing.The second housing is formed integral with the elongated housing.