Segmented Suspension Bush Structure for Crack Isolation and NVH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bush designs for vehicle suspension systems face challenges such as difficulty in propagating cracks and improving performance due to their integral manufacturing process, which can lead to compromised durability and noise, vibration, and harshness (NVH) performance.
Innovation Solution
A bush design is proposed where a side stopper portion and a main body portion are separately provided, each with its own shock absorbing portion, and are coupled through a housing portion. This design allows for the use of materials with different properties for each portion, optimizing their functions and preventing crack propagation from the side stopper to the main body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bush is manufactured integrally, then the structure is simple and easy to manufacture, but cracks cannot be contained and NVH performance is compromised
Solution Approach 1:
The bush is divided into multiple independent portions: a side stopper portion and a main body portion, each with distinct functions. The side stopper portion absorbs lateral shocks while the main body portion handles vertical loads, preventing crack propagation across the entire structure and improving reliability without significantly complicating manufacturing.
Solution Approach 2:
Different portions of the bush are designed with locally optimized properties. The side stopper portion has specific material composition and structural characteristics for lateral shock absorption, while the main body portion has different properties optimized for vertical load bearing, allowing each region to perform its specific function optimally.
2Ease of manufacture
If the bush is manufactured integrally, then manufacturing is simpler, but NVH performance and ride comfort are compromised
Solution Approach 1:
By segmenting the bush into functionally distinct portions, each can be optimized for specific vibration and noise control requirements. The side stopper portion isolates lateral vibrations while the main body portion manages vertical vibrations, significantly improving NVH performance compared to an integral design where all vibrations are transmitted together.
Solution Approach 2:
Each portion is designed with local material properties and structural features optimized for specific frequency ranges and vibration modes. This localized optimization allows the bush to selectively dampen different types of vibrations, improving ride comfort and reducing noise transmission to the vehicle body.
3Reliability
If separate portions are used, then crack propagation is prevented and reliability is improved, but device complexity increases
Solution Approach 1:
The bush is segmented into two main portions that are functionally independent but structurally integrated through a coupling mechanism. This segmentation prevents crack propagation between portions while maintaining a relatively simple overall structure that does not require complex assembly procedures or additional fastening components.
4Object-affected harmful factors
If separate portions are used, then materials can be optimized for each function and NVH performance improved, but manufacturing complexity increases
Solution Approach 1:
The bush is divided into separable portions that can be manufactured using different materials and processes optimized for each function, then assembled through a simple coupling mechanism. This allows for material optimization (e.g., different rubber compounds or polymer blends) in each portion without requiring complex multi-material injection molding or other complicated manufacturing techniques.
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 separate design of the side stopper and main body portions enhances the durability and NVH performance of the bush, allowing for improved ride comfort, reduced noise, and enhanced vehicle handling by optimizing the materials and structures for each component.
Implementation Method 1
The bush serves not only to support a connection between the CTBA and the vehicle body, but also to absorb shocks, vibrations, and noise generated by a suspension or an engine, through elastic deformation thereof.
Data Source
AI summary
An embodiment bush includes a side stopper portion including a first shock absorbing portion, a main body portion including a second shock absorbing portion, wherein the first shock absorbing portion and the second shock absorbing portion are provided discontinuously, and a housing portion configured to couple the side stopper portion to the main body portion.