Composite Jounce Bumper Structure for Block Length and Damping
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Solution Overview
Problem
Existing jounce bumpers made from volume-compressible materials face challenges in achieving a larger block length without compromising dampening and suspension characteristics, as rubber materials offer reduced compression capability but higher block length, leading to reluctance in adopting these materials.
Innovation Solution
Integrate a secondary spring element made of a compact material within the base body, which is resiliently deformable and provides additional length reduction during compression, while the base body remains volume-compressible, allowing for a combined deformation resistance that is soft initially but progressively stiff as deformation increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If volume-compressible material is used for the base body, then compression capability is improved, but block length is reduced
Solution Approach 1:
The jounce bumper combines volume-compressible material (providing compression capability) with compact material (providing block length) in a composite structure. The base body is made of volume-compressible material while incorporating a secondary spring element made of compact material, creating a composite component that achieves both desired properties simultaneously.
Solution Approach 2:
The secondary spring element made of compact material is nested within the base body made of volume-compressible material. This nesting arrangement allows the inner compact element to provide structural length support while the outer volume-compressible material provides compression capability, resolving the contradiction between block length and compression capability.
2Length of moving object
If rubber material is used instead of volume-compressible material, then block length is increased, but compression capability is reduced
Solution Approach 1:
Different regions of the jounce bumper have different material properties optimized for their specific functions. The base body uses volume-compressible material for compression capability, while the integrated secondary spring element uses compact material for maintaining block length. This local differentiation of material quality resolves the contradiction by assigning appropriate materials to appropriate locations.
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 integrated secondary spring element enhances suspension properties by increasing block length and maintaining optimal dampening characteristics, while also protecting the secondary spring element from environmental influences and simplifying installation.
Implementation Method 1
the base body is partially or completely made of a volume-compressible first material
Implementation Method 2
the secondary spring element is resiliently deformable between a first length in the uncompressed state and a second length in the compressed state
Data Source
AI summary
A jounce bumper of an automotive vehicle suspension system contains a longitudinal axis. The jounce bumper is configured to resiliently deform between an uncompressed state and a compressed state, where in the compressed state the jounce bumper has a smaller length in the direction of the longitudinal axis than in the uncompressed state. The jounce bumper also contains a base body that acts as a primary spring element, where the base body is partially or completely made of a volume-compressible first material. In particular, the base body further contains at least one secondary spring element integrated within the base body. The secondary spring element is resiliently deformable between a first length in the uncompressed state and a second length in the compressed state, where the second length is smaller than the first length. The secondary spring element is partially or completely made of a compact second material.