Dual-Material Rebound Bumper for Durable Quiet Shock Absorption
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Solution Overview
Problem
Rebound bumpers in shock absorbers face durability issues and noise problems due to impact during decompression, as they are prone to damage and noise generation during rebound events.
Innovation Solution
A rebound bumper design featuring a first portion with a low spring rate made from an elastomeric material and a second portion with a higher spring rate made from a metallic or polymer material, such as steel or nylon, is implemented. The first portion has an undulating shape with alternating thick and thin sections, and the second portion can be either inside or outside the first portion, providing a displacement under load relationship with three distinct spring rates to enhance durability and noise damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single-material rebound bumper is used, then the structure is simple, but the durability and load-bearing capacity are insufficient
Solution Approach 1:
The rebound bumper is constructed from two different materials with distinct spring rates: a first material (e.g., elastomeric) for the first portion and a second material (e.g., metallic or polymer) for the second portion. This composite structure combines the advantages of both materials to achieve superior durability and load-bearing capacity while managing rebound forces effectively.
Solution Approach 2:
The rebound bumper is divided into two distinct portions: a first portion made from a first material with a first spring rate, and a second portion made from a second material with a second spring rate greater than the first. This segmentation allows each portion to contribute differently to the overall performance, with the softer first portion absorbing initial impacts and the stiffer second portion providing structural support and noise damping.
2Object-generated harmful factors
If a single spring rate design is used, then the design is simple, but the noise damping performance is insufficient
Solution Approach 1:
Different portions of the rebound bumper are assigned different material properties and spring rates to perform different functions. The first portion with lower spring rate is optimized for impact absorption, while the second portion with higher spring rate is optimized for noise damping and structural stability. This local differentiation of properties enhances overall noise damping performance.
Solution Approach 2:
The combination of two materials with different spring rates creates a composite structure that exhibits a complex displacement under load relationship with three distinct spring rates. This composite design effectively dampens noise by distributing and dissipating vibration energy across the different material layers during rebound events.
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 significantly increases the load-bearing capacity and durability of the rebound bumper by 50% and effectively dampens undesired noise during rebound events, compared to traditional designs.
Implementation Method 1
a first portion formed from a first material having a first spring rate... The first portion is a first ring formed from an elastomeric material
Implementation Method 2
a second portion coupled to the first portion and formed from a second material having a second spring rate greater than the first spring rate... the second portion is a second ring formed from a material selected from the group consisting of a metallic material and a polymer material
Implementation Method 3
The first portion is a first ring formed from an elastomeric material... effectively dampens undesired noise during rebound events
Data Source
AI summary
A rebound bumper for a shock absorber includes a first portion formed from a first material having a first spring rate and a second portion coupled to the first portion and formed from a second material having a second spring rate greater than the first spring rate. The first portion and the second portion are configured to fit on a piston rod between a piston and a rod guide assembly of the shock absorber. Also, the rebound bumper exhibits a displacement under load relationship with the first spring rate, the second spring rate, and a third spring rate greater than the first spring rate and less than the second spring rate.