Pneumatically Switchable Fluid-Filled Engine Mount
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Solution Overview
Problem
Existing engine mounts struggle to provide effective vibration damping across multiple, wide frequency ranges, particularly failing to adequately address high-frequency vibrations and low-frequency, small-amplitude vibrations, which leads to insufficient damping performance and increased production complexity and costs.
Innovation Solution
A pneumatically controlled, fluid-filled engine mount with a movable partition member comprising a center movable plate portion and an outer peripheral rubber film portion, where the center plate is rigid and the peripheral film is deformable, allowing for effective pressure fluctuation management across various frequency ranges by selectively switching the second orifice passage between open and closed states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple orifice passages are used to cover wide frequency ranges, then vibration damping coverage is improved, but device complexity increases
Solution Approach 1:
The patent employs a movable partition wall with a flexible film that can dynamically adjust its position and deformation based on input vibration characteristics. This dynamic adjustment allows a single flexible film to function similarly to multiple fixed partition walls, enabling effective fluid flow control across wide frequency ranges without requiring multiple separate orifice passages and associated valve mechanisms.
Solution Approach 2:
The patent utilizes pneumatic pressure to change the physical state and deformation characteristics of the flexible rubber film. By applying different air pressures, the film's stiffness and position are adjusted, allowing it to adapt its characteristics to match different vibration frequency ranges, thereby reducing the need for multiple fixed-configuration orifice passages.
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 achieves excellent vibration damping across multiple frequency ranges with a simple construction, improving production efficiency and cost performance while simplifying the control system and installation process.
Implementation Method 1
a rubber elastic body elastically connecting the first mounting member and the second mounting member
Implementation Method 2
utilizes the flow action of non-compressible fluid sealed in its interior to produce effective vibration damping action
Implementation Method 3
a pneumatic actuator that utilizes air pressure exerted from the outside to drive the valve member
Implementation Method 4
the center movable plate portion and the outer peripheral rubber film portion undergo displacement and deformation so as to absorb pressure fluctuation in the pressure receiving chamber
Data Source
AI summary
A fluid-filled engine mount, including: an elastic body connecting a first and a second mounting member; a pressure receiving chamber partially defined by the rubber elastic body; an equilibrium chamber partially defined by a flexible layer, a first orifice passage connecting between the pressure receiving and equilibrium chambers and tuned to a low frequency range, a second orifice passage connecting the both chambers and tuned to a medium frequency range; a valve member for opening/closing the second orifice passage and operated by a pneumatic actuator; a movable partition member including a rigid center movable plate portion and a readily deformable outer peripheral rubber film portion supported fluid-tightly by the second mount portion; and an intermediate equilibrium chamber formed opposing to the pressure receiving chamber with the movable partition member interposed therebetween.