Inverse Active Engine Mount Actuator Integration

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Solution Overview

Problem

Conventional active engine mounts require a complex fluid system, leading to issues with rattle noise, manufacturing efficiency, and increased size, particularly in front-wheel drive vehicles with transverse engine mounting, where space is limited and noise, vibration, and harshness (NVH) are concerns.

Innovation Solution

An inverse-type active engine mount with an actuator assembly integrated into the support bracket, featuring a magnet and coil configuration that electromagnetically interacts, and a rubber assembly to absorb vibrations, eliminating the need for a fluid system and optimizing packaging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fluid system is used in conventional engine mounts, then vibration control is achieved, but the configuration becomes complicated and rattle noise is generated

Engineering Contradiction:

Improvevibration controlVSAvoidfluid system configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the fluid system from the engine mount structure, replacing it with a solid-based vibration control mechanism using a mass damper and rubber assembly, thereby eliminating the complexity and rattle noise associated with fluid systems while maintaining vibration control functionality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the fluid-based vibration control system with a mechanical system consisting of a mass damper and rubber assembly, substituting hydraulic/pneumatic mechanisms with solid mechanical components to achieve vibration attenuation without the drawbacks of fluid systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a mass damper is added to the support bracket, then vibration attenuation is improved, but the vehicle weight increases

Engineering Contradiction:

Improvevibration attenuationVSAvoidvehicle weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent optimizes the mass damper design by adjusting the mass parameter to be approximately 2.6 kg, which provides effective vibration attenuation while minimizing the weight increase. This parameter optimization allows the system to achieve the desired vibration control performance with the least possible weight penalty

Inventive Principle:

Principle #35Parameter changes

3Reliability

If an active actuator is placed under the insulator, then active vibration control is achieved, but the vertical size increases

Engineering Contradiction:

Improveactive vibration controlVSAvoidvertical size

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent inverts the conventional arrangement by placing the active actuator assembly above the rubber assembly rather than under the insulator. This inverted configuration reduces the vertical height of the engine mount while maintaining active vibration control functionality, making it suitable for front-wheel drive vehicles with limited space

Inventive Principle:

Principle #13The other way round (Inversion)

4Reliability

If the orifice assembly is connected to the support bracket, then it serves as a mass damper, but rattle noise is generated

Engineering Contradiction:

Improvemass damper functionVSAvoidrattle noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent removes the orifice assembly from the support bracket connection, eliminating the source of rattle noise. Instead, a dedicated mass damper is integrated into the support bracket design, providing the same vibration attenuation function without generating rattle noise

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the complex orifice assembly with a simpler mass damper design that is easier to manufacture and install. The mass damper provides effective vibration control without the sealing complexity and rattle noise issues of the orifice assembly

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 a simplified configuration, improved NVH performance, reduced size, and enhanced packaging efficiency, while also functioning as a mass damper and power generator, eliminating the need for a fluid system and addressing resonance issues with a low first-order natural frequency.

Implementation Method 1

an actuator assembly integrally coupled to the support bracket and including a magnet and a coil that electromagnetically interact with each other

Methodology Applied

Scientific EffectElectromagnetic interaction: Electromagnetic Induction

Implementation Method 2

a rubber assembly mounted to a vehicle body by a mounting bracket and configured to absorb vibration via a main rubber

Methodology Applied

Scientific EffectVibration absorption: Damping

Data Source

PatentUS10899216B2Active engine mount for vehicle

Publication Date: 2021.01.26 HYUNDAI MOTOR CO LTD

AI summary

An active engine mount for a vehicle may include a support bracket connected to an engine; an actuator assembly integrally coupled to the support bracket and including a magnet and a coil that electromagnetically interact with each other; and a rubber assembly mounted to a vehicle body by a mounting bracket and configured to absorb vibration via a main rubber, wherein in a state in which the actuator assembly is located above the rubber assembly, a housing of the rubber assembly is fastened to the support bracket, and wherein the magnet is connected to the main rubber of the rubber assembly to enable transfer of force.