Rubber Bushing Structure with Split Resonance Frequencies
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Solution Overview
Problem
Conventional rubber bushings for vehicles experience increased vibration when the input frequency matches the natural frequency of the rubber insulators, leading to resonance issues, particularly in electric vehicles where engine noise is reduced, revealing previously hidden noise problems from other sources.
Innovation Solution
A rubber bush type vibration damping device with inner and outer coupling parts and multiple rubber insulators of varying shapes and lengths, where each unit vibration damping module has a unique shortest length and natural frequency, distributed within 400 Hz to 3000 Hz, to reduce resonance energy by differing natural frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rubber insulators with the same shape and length are used, then the structure is simple and easy to manufacture, but resonance occurs when input vibration frequency matches the natural frequency of the rubber insulators
Solution Approach 1:
The patent divides the vibration damping system into multiple independent rubber insulator units, where each unit can have different shapes and lengths. This segmentation allows each rubber insulator to have different natural frequencies, preventing simultaneous resonance across all units when exposed to vibration of a particular frequency range (400-3000 Hz).
Solution Approach 2:
The patent applies local quality by making each rubber insulator within the group have different local characteristics (different shapes and lengths), while they all perform the same basic function of vibration damping. This differentiation in local properties ensures that not all rubber insulators resonate at the same frequency, thereby reducing overall resonance effects.
2Object-affected harmful factors
If rubber insulators with different shapes and lengths are used, then resonance energy is reduced by distributing natural frequencies, but the device complexity increases
Solution Approach 1:
The vibration damping device is segmented into multiple rubber insulator units with varying geometries. Each segment (rubber insulator) contributes to the overall damping function while having a unique natural frequency due to its specific shape and length, thereby distributing the resonance risks across different frequency ranges.
Solution Approach 2:
The patent employs asymmetry by designing rubber insulators with different shapes and lengths rather than using identical symmetric units. This asymmetric design ensures that each rubber insulator has a distinct natural frequency, preventing synchronized resonance and reducing overall vibration energy in the critical frequency range of 400-3000 Hz.
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
Effectively decreases resonance energy by distributing resonance frequencies among rubber insulators, reducing overall vibration and noise in vehicles, particularly in the 400 Hz to 3000 Hz range, addressing the resonance issues in electric vehicles.
Implementation Method 1
The rubber insulator 30 is a vibration damping body made of rubber for reducing vibration between the inner coupling part 10 and the outer coupling part 20
Implementation Method 2
one or more unit vibration damping modules have different shapes and different shortest lengths of the unit vibration damping module... the primary natural frequency of each of the plurality of rubber insulators is within 400 Hz to 3000 Hz... effectively decreases resonance energy by distributing resonance frequencies among rubber insulators
Data Source
AI summary
Proposed is a rubber bush type vibration damping device for a vehicle, which solves the problem of vibration increase which may occur in the natural frequency of the vibration damping device by changing the shapes of an inner coupling part or an outer coupling part and by using difference in the lengths of rubber insulators due to the changing of the shapes thereof. The vibration damping device includes an inner coupling part, an outer coupling part, and a plurality of rubber insulators having have different natural frequency.