Mount Bushing Structure for Stable Peak Frequency Under Load
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Solution Overview
Problem
Existing mount bushings in vehicles experience frequency shifting due to dynamic load changes, leading to adverse effects on vehicle noise, vibration, and harshness (NVH) during engine operation.
Innovation Solution
A mount bushing design featuring an outer tube, inner tube, rubber part, tubular mass with an opening, and a stopper that minimizes mutual interference between the mass and stopper during deformation, maintaining constant peak frequency despite varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a mass is provided in the rubber part to reinforce the rigidity of the mount bushing, then the rigidity is improved, but the frequency shifts backward and dynamic properties are amplified when a load is applied
Solution Approach 1:
A stopper is introduced as an intermediary element between the mass and the rubber part. The stopper prevents direct contact and mutual interference between the mass and rubber part during deformation, thereby maintaining frequency stability while preserving the rigidity enhancement provided by the mass
Solution Approach 2:
The mount bushing is segmented into distinct functional components: the mass (separated into inner and outer masses), the stopper, and the rubber part. This segmentation allows each component to perform its specific function independently - the mass provides rigidity, the stopper maintains frequency stability by preventing interference, and the rubber part provides mounting functionality
2Adaptability or versatility
If dynamic properties are changed according to load size during vehicle driving, then the mount responds to engine torque, but frequency shifting occurs around 500 Hz causing noise, vibration, and harshness
Solution Approach 1:
The stopper acts as a mediator that decouples the mass from the deformation process of the rubber part. This allows the mount to adapt to varying loads while preventing the mass from interfering with the rubber part's deformation, thereby avoiding frequency shifting and the associated NVH problems
Solution Approach 2:
The mount bushing is designed to be dynamically responsive to loads through the rubber part's inherent elasticity, while the stopper ensures that the mass does not create harmful dynamic interactions. The system adapts to load changes without causing frequency shifting
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
Prevents noise, vibration, and harshness by maintaining constant peak frequency through reduced frequency shifting, enhancing vehicle performance.
Implementation Method 1
a rubber part provided between the outer tube and the inner tube
Implementation Method 2
mutual interference between the mass and the stopper in deformation due to an external force
Data Source
AI summary
A mount bushing is proposed. The mount bushing is configured to minimize frequency shifting according to difference of dynamic properties applied by a load input to a mount. The mount bushing includes an outer tube, an inner tube provided in the outer tube, a rubber part provided between the outer tube and the inner tube, a tubular mass provided in the rubber part and having an opening formed by partially penetrating an outer circumferential surface thereof, and a stopper shaped to protrude outward from the inner tube to pass through the opening of the tubular mass, wherein the mount bushing is configured to minimize mutual interference between the mass and the stopper in deformation due to an external force.