Mount Bushing With Isolated Outer Insert For High Frequency Vibration

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Solution Overview

Problem

Electric vehicle drive units face challenges in isolating high-frequency vibrations due to resonances in the 300-2000 Hz frequency range, requiring additional mass, cost, and space with traditional mount assemblies, and enhanced isolation is needed for motor vibrations.

Innovation Solution

A mount bushing design featuring an outer mounting ring, an outer structural ring, a main elastomeric isolation arrangement, and an outer ring isolation layer, which creates a mass-damper effect for high-frequency isolation without significant added mass or space, using elastomer materials between the structural components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional mount assemblies are used to isolate high-frequency vibrations, then isolation performance is improved, but mass, cost, and packaging space increase significantly

Engineering Contradiction:

Improvevibration isolation performanceVSAvoidmount assembly mass

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent implements a nested isolation structure where an outer isolation layer and an inner isolation arrangement are positioned concentrically around a central bore. The outer isolation layer is disposed between the outer mounting ring and outer structural ring, while the inner isolation arrangement is disposed between the outer structural ring and inner structural insert, creating a nested configuration that provides enhanced isolation performance within a compact space without significant mass increase.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The isolation system is divided into distinct segments: an outer ring isolation layer and a main elastomeric isolation arrangement, each serving specific frequency ranges. The outer isolation layer targets high-frequency vibrations (above 1000 Hz) while the inner isolation arrangement handles lower frequencies, allowing each segment to be optimized for its specific function and reducing the need for additional TVA components.

Inventive Principle:

Principle #1Segmentation

2Reliability

If Tuned Vibration Absorber (TVA) is added to mitigate resonances in the 300-2000 Hz range, then resonance mitigation is improved, but mass, cost, and packaging space increase significantly

Engineering Contradiction:

Improveresonance mitigationVSAvoidmount assembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the resonance mitigation function directly into the mount bushing structure itself. The outer structural ring and inner structural insert form an integrated mass-damper system that provides TVA functionality without requiring separate external components. This integration eliminates the need for additional TVA parts while maintaining resonance mitigation capabilities in the 300-2000 Hz range.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If enhanced isolation is provided for motor vibrations at certain vibration orders, then isolation performance is improved, but device complexity increases

Engineering Contradiction:

Improvemotor vibration isolationVSAvoidmount structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating an isolated outer ring isolation layer with specific material properties and geometric characteristics tailored for isolating motor vibrations at certain vibration orders. The outer isolation layer is positioned and dimensioned to target specific vibration frequencies from the motor, providing localized optimization without requiring complex adjustments throughout the entire mount structure.

Inventive Principle:

Principle #3Local quality

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 isolates high-frequency vibrations, reducing dynamic stiffness in the 1200-1400 Hz range and mitigating resonance without increasing mass or packaging space, providing enhanced isolation performance for electric vehicle drive units.

Implementation Method 1

a main elastomeric isolation arrangement (18) is disposed between the outer structural ring (14) and an inner structural insert (20), wherein the main elastomeric isolation arrangement (18) includes an isolation mass (17) formed as an annular ring that is supported between the outer structural ring (14) and the inner structural insert (20) by elastomer material

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The design effectively isolates high-frequency vibrations, reducing dynamic stiffness in the 1200-1400 Hz range and mitigating resonance

Methodology Applied

Scientific EffectDamping: Damping

Data Source

PatentUS11692603B2Mount bushing with integrated isolated outer insert for enhanced high frequency isolation performance

Publication Date: 2023.07.04 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A mount bushing includes an outer mounting ring adapted for connection to a mount structure. An outer structural ring is disposed inside of the outer mounting ring. A main elastomeric isolation arrangement is disposed between the outer structural ring and an inner structural insert, wherein the main elastomeric isolation arrangement is supported between the outer structural ring and the inner structural insert by elastomer material. An outer ring isolation layer of elastomer is disposed between the outer mounting ring and the outer structural ring, wherein the outer ring isolation layer is isolated from the main elastomeric isolation arrangement by the outer structural ring. A mounting bolt is inserted through a bore in the inner structural insert.