Hydraulic Mount Nozzle Assembly for Multi-Band Vibration Isolation
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Solution Overview
Problem
Existing hydraulic mounts face challenges in improving insulation performance in specific frequency bands without significant design changes, particularly in effectively damping engine vibrations across varying excitation amplitudes.
Innovation Solution
The hydraulic mount incorporates a core with an external insulator and a diaphragm, featuring a nozzle assembly with upper and lower nozzles and a membrane, which includes upper and lower nozzle passages and a guide wall, to enhance damping characteristics by optimizing fluid flow and pressure distribution, thereby improving insulation performance without altering the overall design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydraulic mount uses a conventional nozzle assembly design, then the overall design is simple, but the insulation performance in specific frequency bands is insufficient
Solution Approach 1:
The nozzle assembly is segmented into multiple independent nozzles (first nozzle, second nozzle, third nozzle, fourth nozzle) arranged around the fluid passage. Each nozzle can be independently designed and optimized, allowing improvement of insulation performance in specific frequency bands while maintaining manageable complexity through modular design
Solution Approach 2:
Different nozzles are positioned at different locations around the fluid passage to target specific frequency bands. The first and second nozzles address one frequency range while the third and fourth nozzles address another frequency range, allowing localized optimization of damping characteristics without redesigning the entire assembly
2Reliability
If the hydraulic mount optimizes damping characteristics for one frequency band, then insulation performance improves in that band, but performance in other frequency bands deteriorates
Solution Approach 1:
The nozzle assembly is designed with multiple nozzles that simultaneously serve different frequency bands. The first and second nozzles optimize damping for one frequency range while the third and fourth nozzles optimize damping for another frequency range, allowing a single assembly to perform multiple damping functions across different frequency bands
Solution Approach 2:
The nozzles are positioned asymmetrically around the fluid passage at different angular locations. This asymmetric arrangement allows each nozzle to target specific vibration modes and frequency bands, enabling the assembly to provide optimized damping across multiple frequency ranges rather than uniform performance
3Device complexity
If the membrane is positioned close to the nozzles, then the device complexity is reduced, but the durability of the membrane deteriorates due to high fluid pressure
Solution Approach 1:
The fluid passage acts as an intermediary between the nozzles and the membrane. It distributes the fluid pressure from the nozzles in a controlled manner, preventing direct high-pressure impact on the membrane while maintaining the functional relationship between the nozzle assembly and membrane. This intermediary structure protects the membrane from pressure damage
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
This configuration enhances dynamic characteristics and reduces vibration transmission in a predetermined frequency band, improving insulation performance and reducing noise, while maintaining the durability of the membrane and avoiding design changes.
Implementation Method 1
a fluid is sealed between the insulator and the diaphragm... an upper chamber and a lower chamber are provided between the insulator and the diaphragm by a nozzle assembly... to enhance damping characteristics by optimizing fluid flow
Data Source
AI summary
A hydraulic mount in which a fluid for supporting an engine of a vehicle is sealed, includes a core configured to receive vibration from outside, an insulator molded on the external side of the core, and a diaphragm spaced at a predetermined distance from the insulator, wherein a fluid is sealed between the insulator and the diaphragm, and an upper chamber and a lower chamber are provided between the insulator and the diaphragm by a nozzle assembly. The nozzle assembly includes an upper nozzle located adjacent to the upper chamber, a lower nozzle coupled to the upper nozzle and located adjacent to the lower chamber, and a membrane located between the upper nozzle and the lower nozzle.