Fluid-Sealed Engine Mount Air Chamber Noise Control
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Solution Overview
Problem
Conventional fluid-sealed engine mounts generate noise due to membrane vibration and cavitation phenomena, limiting their insulation performance in high frequency bands.
Innovation Solution
A fluid-sealed engine mount design featuring an insulator with a chamber divided by an orifice module, an air chamber, and an elastic membrane with a partition wall and stopper to control membrane movement, reducing noise and cavitation by managing fluid flow and pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the membrane is constrained to the orifice module to prevent noise, then noise reduction is achieved, but insulation performance in high frequency band deteriorates
Solution Approach 1:
The patent introduces an air chamber as an intermediary element between the membrane and the orifice module. This air chamber acts as a cushion that absorbs the membrane's vibration without requiring direct constraint, thereby reducing noise while maintaining the membrane's freedom to move for effective vibration isolation.
Solution Approach 2:
The patent extracts the air chamber as a separate functional element from the traditional direct constraint structure. By removing the direct constraint mechanism and replacing it with an air-filled chamber, the system achieves noise reduction without compromising the membrane's ability to isolate vibrations.
2Reliability
If the membrane moves freely to allow fluid flow, then insulation performance is improved, but noise generation increases
Solution Approach 1:
The air chamber serves as a mediator that decouples the membrane's movement from direct contact with the orifice module. This allows the membrane to move freely for fluid flow and vibration isolation while the air chamber absorbs the resulting vibrations, preventing noise generation.
3Productivity
If negative pressure is increased in the upper chamber to improve fluid flow rate, then vibration isolation is enhanced, but cavitation occurs
Solution Approach 1:
The air chamber acts as a counterbalancing element that compensates for the negative pressure in the upper chamber. By providing a compressible air cushion, it prevents the pressure from dropping low enough to cause cavitation, thereby maintaining stable fluid flow without bubble formation.
4Productivity
If the membrane vibrates severely due to increased fluid flow rate, then vibration isolation capability is improved, but noise generation increases
Solution Approach 1:
The air chamber functions as a vibration-absorbing intermediary that allows the membrane to vibrate for effective vibration isolation while capturing and dampening these vibrations before they propagate as noise to the orifice module and surrounding structure.
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 design effectively minimizes noise and improves insulation performance across both high and low frequency bands by controlling membrane vibration and preventing cavitation, enhancing the dynamic characteristics of the engine mount.
Implementation Method 1
an air chamber provided at a center portion of the orifice module and filled with air
Implementation Method 2
an elastic membrane disposed above the air chamber at the center portion of the orifice module
Implementation Method 3
negative pressure is applied to the upper chamber 72 and therefore cavitation is caused due to vaporization of the fluid
Data Source
AI summary
A fluid-sealed engine mount may include an insulator integrally formed on an external side of a mount core configured to be coupled to an engine and having a chamber with which fluid for insulation of vibration is sealed; an orifice module mounted below the mount core to divide the chamber into two chambers and having a fluid passage for flow of the fluid; an air chamber provided at a center portion of the orifice module and filled with air; and an elastic membrane mounted above the air chamber at the center portion of the orifice module to seal the air chamber airtightly.