Cylindrical Motor Mount Structure for High-Frequency Vibration Isolation
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Solution Overview
Problem
Conventional antivibration devices for electric motors in vehicles lack effective vibration support due to differences in torque, vibration frequency, and driving reactions compared to internal combustion engines, requiring improved antivibration properties and support spring rigidity.
Innovation Solution
A cylindrical antivibration device with a rubber elastic element connecting an inner shaft member and an outer cylinder member, featuring an elastic protrusion that protrudes axially and circumferentially, providing enhanced support spring rigidity and dynamic performance across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antivibration device structure is used for electric motors, then the structure is simple and familiar, but the antivibration performance is insufficient for electric motor vibration frequencies
Solution Approach 1:
The rubber elastic element is segmented into multiple functional regions including a body portion, an elastic protrusion extending axially, and elastic protrusions extending radially. This segmentation allows each region to address specific vibration frequency ranges, with the body portion handling lower frequencies and the elastic protrusions addressing higher frequencies up to 1000 Hz, thereby improving antivibration performance without requiring a completely new device structure
Solution Approach 2:
The invention adds dimensional complexity by extending elastic protrusions not only axially from the body portion but also radially outward. This multi-directional protrusion structure creates additional vibration isolation pathways in multiple spatial dimensions, enabling effective attenuation of both radial and axial vibrations generated by electric motors while maintaining structural integration
2Reliability
If the support spring rigidity is increased to handle high frequency vibrations, then the antivibration performance improves, but the dynamic spring performance peaks in the 500 Hz to 1000 Hz range increase
Solution Approach 1:
The rubber elastic element features local quality variations through its multi-region structure. The body portion has different elastic properties than the elastic protrusions, with each region optimized for specific frequency ranges. The elastic protrusions are strategically positioned and dimensioned to provide localized stiffness adjustments that suppress dynamic spring performance peaks in the 500-1000 Hz range while maintaining overall support rigidity
Solution Approach 2:
The invention changes the elastic parameters of the rubber material through its structured design. By varying the geometry, dimensions, and distribution of the elastic protrusions relative to the body portion, the device achieves frequency-dependent parameter modulation. This allows the support spring rigidity to be optimized for high-frequency vibrations while suppressing resonant peaks through careful parameter selection in the protrusion design
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 device achieves superior antivibration performance by securing support spring rigidity and reducing dynamic spring performance peaks in the 500 Hz to 1000 Hz range, effectively addressing the unique vibration challenges of electric motors in vehicles.
Implementation Method 1
an inner shaft member (12) and an outer cylinder member (14) are connected to each other by a rubber elastic element (16)
Data Source
AI summary
Provided is a cylindrical antivibration device for a motor mount mounted between an electric motor for driving and support members in an automobile, the cylindrical antivibration device having an inner shaft member and an outer cylinder member which are coupled by a body rubber elastic element, in which surfaces of the inner shaft member and the outer cylinder member that face each other in a direction perpendicular to the shaft are continuously coupled over the entire circumference via the body rubber elastic element. On an axial end surface of the body rubber elastic element, an elastic protrusion, that protrudes outward in the axial direction and extends circumferentially in an intermediate portion between the facing surfaces of the inner shaft member and the outer cylinder member, is formed integrally with the body rubber elastic element.