Cammed Flange Mounting for Vibration Isolation
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Solution Overview
Problem
Existing vibration-sensitive module mounting arrangements on vibrational bases, such as internal combustion engines, inadequately isolate modules from transverse vibrational movements due to limited absorption of vibrational impulses, leading to premature fatigue and performance degradation of electronic components.
Innovation Solution
A mounting apparatus featuring a flange with cammed surfaces adjacent to elastomeric bushings, which engages the bushing periphery to enhance force absorption and minimize cross-coupling of vibrational forces, ensuring the elastomeric material retains compressibility under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bushing assemblies with washers and sleeves are used to mount vibration-sensitive modules, then z-axis vibrational impulse absorption is adequate, but transverse plane vibration isolation is insufficient causing bushing collapse and sharp force transmission increases
Solution Approach 1:
The mounting flange is segmented into multiple functional zones: a central bore for the bushing, cambered surfaces for transverse impulse absorption, and a recessed portion for positioning. This segmentation allows each zone to address specific vibration isolation requirements independently, with the cambered surfaces specifically designed to handle transverse impulses that would otherwise cause bushing collapse
Solution Approach 2:
The invention transitions from traditional axial-only vibration isolation to multi-dimensional isolation by adding cambered surfaces that actively engage with the bushing during transverse vibration events. The cambered surfaces convert transverse impulses into controlled radial forces, preventing bushing collapse and maintaining isolation effectiveness in previously unprotected dimensional planes
2Force
If elastomeric bushing material is increased between flange and washers, then z-axis vibration absorption improves, but transverse plane absorption remains limited and bushing material collapses under transverse load
Solution Approach 1:
Instead of uniformly increasing bushing material throughout, the invention applies local quality enhancement by adding cambered surfaces only in the regions where transverse impulse absorption is needed. The cambered surfaces create localized engagement zones that provide structural support precisely where transverse loads occur, maintaining bushing material integrity without requiring excessive material throughout the entire assembly
3Ease of manufacture
If bushing assembly uses standard flange configuration with through-holes, then manufacturing is simple, but vibration isolation performance is inadequate due to limited elastomeric material engagement
Solution Approach 1:
The invention replaces the standard flat flange configuration with cambered (curved) surfaces that engage the bushing during transverse vibration. These curved surfaces are formed using standard machining operations, maintaining ease of manufacture while dramatically improving vibration isolation performance by enabling the flange to actively participate in absorbing transverse impulses rather than merely serving as a mounting platform
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 significantly improves vibration isolation in both z-axis and transverse planes, reducing the likelihood of elastomeric material collapse and maintaining effective damping of vibrational forces, thereby enhancing the reliability and performance of vibration-sensitive modules.
Implementation Method 1
The elastomeric material of bushings 18 and 20 is designed to absorb vibrational movements of the base 10
Implementation Method 2
elastomeric bushings are interposed between the module and the base to dampen the amount of vibrational energy transmitted from the base to the module
Implementation Method 3
the cammed surfaces radially adjacent to the bushings that variably engages an outer radial periphery of the bushings
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A vibration-sensitive module (12) having a mounting flange (36) is mounted to a vibrational base (10) with a bushing assembly (34) secured to the base (10), where the mounting flange (36) has cammed surfaces (36e, 36f) radially adjacent to the bushing assembly (34) that variably engage the radial peripheries of the bushings (38, 40) in response to vibrational movement of the base (10). The cammed surfaces (36e, 36f) produce a desired force vs. deflection characteristic of the mounting apparatus, and the bushing material retains its compressibility under load to minimize cross-coupling of vibrational force impulses.