Hydraulic Mount Bolt-Through Construction for Vibration Damping
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Solution Overview
Problem
Existing mounting systems for automotive components, such as engine and subframe mounts, face challenges in achieving high damping levels while maintaining a compact design and efficient vibration isolation.
Innovation Solution
A hydraulic mount design featuring two chambers with an interconnecting channel, where damping is achieved through fluid resonance, and tuning is adjusted by varying the length and cross-sectional area of the channel, along with strategically placed ports for optimal fluid flow and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional mounting systems are used to achieve high damping levels, then vibration isolation is improved, but the device size and complexity increase
Solution Approach 1:
The patent employs a hydraulic mounting system where fluid pressure and flow dynamics provide the damping mechanism. The hydraulic fluid moves through restricted passages and valves, creating pressure-dependent damping forces that isolate vibrations without requiring complex mechanical structures.
Solution Approach 2:
The damping characteristics are adjusted by changing hydraulic parameters such as fluid viscosity, passage geometry, and valve settings rather than redesigning the entire mounting structure. This allows tuning of vibration isolation performance while maintaining a compact design.
2Object-affected harmful factors
If larger mounting components are used to increase damping capacity, then vibration isolation is improved, but the mounting system size increases
Solution Approach 1:
The hydraulic system generates high damping forces within a compact volume by utilizing fluid compressibility and pressure buildup in restricted passages. The small volume of hydraulic fluid creates large pressure differentials that provide substantial damping capacity without increasing component size.
Solution Approach 2:
Damping capacity is optimized by adjusting hydraulic parameters such as fluid bulk modulus, passage cross-sectional area, and valve orifice size, allowing high damping performance in a compact mounting system.
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 provides high damping characteristics with a compact design, effectively isolating vibrations and noise by utilizing fluid resonance and positive pumping action, allowing for precise tuning of damping levels.
Implementation Method 1
The damping of the mount is achieved by the resonance of the mass of the fluid in the connecting channel
Implementation Method 2
effectively isolating vibrations and noise by utilizing fluid resonance and positive pumping action
Data Source
AI summary
A hydraulic mount has an upper support member and a lower support member. An upper elastomeric spring and a lower elastomeric spring are disposed between the upper support member and the lower support member to define an upper fluid chamber and a lower fluid chamber. A channel extends between the upper and lower chambers. During compression and extension of the hydraulic mount, fluid transfers between the upper and lower chamber to provide a damping force for the hydraulic mount.