Fluid-Sealed Engine Mount With Variable Orifice for Vibration Damping
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Solution Overview
Problem
Conventional fluid-sealed engine mounts experience reduced damping force and varying frequency response with large displacement engine movements, leading to inadequate vibration insulation due to increased frictional resistance and flow reduction in the fluid path.
Innovation Solution
A fluid-sealed engine mount with a variable orifice whose cross-sectional area changes according to engine vibration magnitude, utilizing a contact rib and membrane unit to maintain consistent damping performance across small and large displacement vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional fluid-sealed engine mount uses a fixed flow path between upper and lower liquid chambers, then the structure is simple, but the damping force reduces and frequency increases with large displacement vibrations
Solution Approach 1:
The patent applies the dynamics principle by making the orifice cross-sectional area variable rather than fixed. The orifice is configured to change its cross-sectional area according to the displacement magnitude of the engine, allowing the damping characteristics to adapt dynamically. This resolves the contradiction by enabling the system to maintain appropriate damping force across different vibration amplitudes while keeping the overall structure relatively simple.
Solution Approach 2:
The patent implements parameter changes by varying the cross-sectional area of the orifice based on displacement magnitude. The flow path parameters (specifically the orifice area) are adjusted according to the engine's vibration amplitude, allowing the damping force to remain effective for both small and large displacements. This resolves the issue of damping force reduction in large displacement scenarios.
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 engine mount maintains a consistent damping performance by increasing damping force during large displacement vibrations, ensuring the same level of vibration insulation as during small displacement vibrations, thereby minimizing excitation and enhancing input point rigidity.
Implementation Method 1
frictional resistance caused by the flow of the fluid in the flow path (orifice)
Implementation Method 2
an insulator for vibration insulation, and the vibration of the engine is absorbed by the insulator and the fluid
Data Source
AI summary
A fluid-sealed engine mount includes a variable orifice whose cross-section is changed according to a magnitude of engine vibration, thereby keeping a damping performance substantially unchanged at a time of large displacement vibration of an engine as compared to a time of small displacement vibration of the engine.