Radiator Bushing Two-Stage Support Structure for Z-Axis Vibration Attenuation
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Solution Overview
Problem
Radiator bushings in vehicles face challenges in efficiently attenuating vibrations in the Z direction due to restrictive size and space constraints, leading to inadequate noise, vibration, and harshness (NVH) performance, as dynamic characteristics in the X and Y directions are higher than in the Z direction, resulting in unnecessary vibration transfer during engine idle.
Innovation Solution
A radiator bushing with a two-stage support structure featuring different inclined angles and materials, including a center core and support portions made of elastic synthetic resin with a rigid ring-shaped stopper, allowing for adjustable dynamic characteristics in the Z direction without increasing size, and incorporating drain holes for durability and tuning flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radiator bushing size is increased to improve vibration attenuation in the Z direction, then the vibration isolation performance improves, but the space constraints and device complexity increase
Solution Approach 1:
The radiator bushing is divided into multiple functional segments: a mounting portion for structural support, a center core for Z-direction vibration attenuation, and support portions connecting the two. This segmentation allows each part to be optimized independently for its specific function while maintaining overall compactness.
Solution Approach 2:
Different regions of the radiator bushing are assigned different material properties and structural characteristics. The center core uses highly elastic synthetic resin for maximum Z-direction deformation, while the mounting portion uses rigid material for structural stability. This local differentiation enables improved vibration attenuation without increasing overall size.
2Reliability
If the dynamic characteristics in X and Y directions are reduced to improve NVH performance, then vibration isolation improves, but the structural stability and load-bearing capacity deteriorate
Solution Approach 1:
The bushing structure separates vibration attenuation functions (center core with high elasticity in Z-direction) from structural support functions (mounting portion with high rigidity). This segmentation allows independent optimization of dynamic characteristics in different directions without compromising overall structural stability.
Solution Approach 2:
The mounting portion uses rigid material to maintain structural stability and load-bearing capacity, while the center core uses elastic material specifically for Z-direction vibration attenuation. This local quality differentiation resolves the contradiction between NVH performance and structural stability.
3Strength
If a metallic stopper is used to constrain the radiator bushing, then the structural integrity improves, but the elastic deformation capability in Z direction decreases
Solution Approach 1:
The stopper is positioned only at the mounting portion where structural constraint is needed, while the center core remains unconstrained to maintain elastic deformation capability. This localized application of the stopper resolves the contradiction between structural integrity and vibration attenuation.
Solution Approach 2:
The center core acts as an intermediary element between the rigid mounting portion and the radiator pin, providing elastic deformation capability while the stopper provides structural constraint. This intermediary structure allows both rigid constraint and elastic motion to coexist.
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 solution effectively improves vibration attenuation in the Z direction, enhances durability, and allows for tuning of NVH performance by separating vibration characteristics in the X, Y, and Z directions, thereby minimizing side effects and improving overall NVH performance.
Implementation Method 1
a radiator bushing which is mounted on a frame of a vehicle body to support a load of a radiator, and more particularly, to a radiator bushing developed to more efficiently attenuate vibration, which occurs in an engine, by improving dynamic characteristics in a Z direction
Implementation Method 2
the radiator releases vibration energy by synchronizing a main frequency (explosion excitation frequency) of the engine when the vehicle idles
Data Source
AI summary
A radiator bushing mounted in a vehicle body to support a load of a radiator includes a mounting portion having an outer side fixed to the vehicle body, a center core at a center with a center hole, and a support portion having an inner side and an outer side. The support portion includes a first support portion and a second support portion with an inclined angle α of the first support portion and an inclined angle β of the second support portion are determined to be different.The support portion has a two-stage structure in which inclined angles are different, and a direction ratio of a Z axis direction to an X axis direction and a Y axis direction may be easily adjusted.