EV Motor Mount With Hydro Mass Damper for Residual Vibration
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Solution Overview
Problem
Rubber bush type motor mounts in electric vehicles suffer from secondary residual vibration and deteriorated ride comfort due to insufficient vibration isolation, particularly in the axial direction.
Innovation Solution
A mount incorporating a hydro mass damper detachably coupled with a rubber bush, where the hydro mass damper includes a fluid flow mechanism to dampen vibrations, separated from the rubber bush to improve vibration isolation and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber bush type motor mount is used, then the motor module can be mounted on the vehicle body, but secondary residual vibration occurs and ride comfort deteriorates
Solution Approach 1:
The motor mount is divided into two separate functional components: a rubber bush for primary vibration isolation and a hydro mass damper for residual vibration suppression. This segmentation allows each component to specialize in its optimal function, with the rubber bush handling high-amplitude vibrations and the hydro mass damper addressing low-amplitude residual vibrations, thereby resolving the contradiction between mounting reliability and residual vibration control.
Solution Approach 2:
The patent combines the rubber bush and hydro mass damper into a unified motor mount assembly that integrates two different vibration control mechanisms. The rubber bush provides elastic isolation while the hydro mass damper adds viscous damping through fluid flow, creating a composite system that addresses both primary vibration isolation and residual vibration suppression, thus improving overall ride comfort.
2Ease of manufacture
If a rubber bush type motor mount is used, then the structure is simple and easy to manufacture, but axial vibration isolation characteristics are insufficient
Solution Approach 1:
The motor mount is segmented into a rubber bush component and a hydro mass damper component, each optimized for specific functions. The rubber bush maintains manufacturing simplicity through conventional rubber molding processes, while the hydro mass damper adds axial vibration isolation capability through a separate but integrated fluid-based damping mechanism, thus improving axial vibration isolation without significantly complicating the overall manufacturing process.
Solution Approach 2:
The patent introduces a hydro mass damper that utilizes hydraulic principles with fluid flowing through channels in the rubber bush. This hydraulic mechanism enhances axial vibration isolation by creating pressure-dependent damping forces that resist axial vibrations, while the fluid channels are integrated into the existing rubber bush structure to minimize manufacturing complexity.
3Reliability
If the hydro mass damper is integrated with the rubber bush, then vibration isolation improves, but device complexity increases
Solution Approach 1:
The hydro mass damper is nested within the rubber bush structure, with fluid channels formed inside the rubber bush material. This nesting approach allows the hydro mass damper to be housed within the existing rubber bush geometry, utilizing the rubber bush's internal volume for fluid flow paths. The integrated design improves vibration isolation performance while minimizing the increase in device complexity by sharing structural space between the two components.
Solution Approach 2:
The patent merges the hydro mass damper and rubber bush into a single integrated assembly where the fluid channels of the hydro mass damper are embedded within the rubber bush structure. This merging creates a unified component that provides both elastic isolation from the rubber and viscous damping from the fluid, improving overall vibration isolation while avoiding the need for completely separate mounting structures.
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 hydro mass damper effectively reduces residual vibrations and enhances noise, vibration, and harshness (NVH) performance by damping primary vibrations through fluid flow, while the rubber bush provides secondary isolation, improving overall ride and handling (R&H) performance.
Implementation Method 1
a fluid flowing through an inside of the hydro mass damper according to vibration applied to the hydro mass damper
Implementation Method 2
The motor mount 1200 connects the vehicle body or a cross member 1220 with a PE housing 1240 having the motor module accommodated therein. The motor mount 1200 may be press-fitted into the vehicle body or the cross member 1220 and may be coupled to the PE housing 1240 through a bolt 1260.
Data Source
AI summary
A mount is configured to mount a motor module of an electric vehicle. The mount includes a hydro mass damper capable of being assembled with a rubber bush, and the hydro mass damper includes a fluid flowing through an inside of the hydro mass damper according to vibration applied to the hydro mass damper.