Helical Elastomer Bushing for Broad-Band Motor Vibration Damping
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Solution Overview
Problem
Conventional anti-vibration brackets for electric motors are heavy, complex, and costly to manufacture, and existing solutions fail to effectively absorb vibrations across the entire frequency range generated by electric motors.
Innovation Solution
A bushing for anti-vibration brackets featuring a helically extending structure with elastomeric materials, such as thermoplastic elastomers, that connects to an inner sleeve and outer sleeve, allowing for reversible displacement and adjustable stiffness, enabling effective vibration absorption across a broad frequency range while being lighter and easier to manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional anti-vibration brackets are used for electric motors, then the structure provides basic support, but the bracket becomes heavy and complex to manufacture
Solution Approach 1:
The bushing integrates multiple functions into a single component: the inner sleeve provides structural support and connection, while the helical blades provide vibration damping. This merging of support and damping functions into one integrated bushing reduces the overall number of parts and simplifies the bracket structure, resolving the contradiction between weight reduction and structural complexity.
Solution Approach 2:
The bushing utilizes composite construction with an inner sleeve and external helical blades that can be made from different elastomeric materials or material compositions. This allows optimization of each component for its specific function while maintaining overall structural integrity, reducing weight without compromising performance or increasing complexity.
2Reliability
If conventional damping structures are used, then the bracket provides basic vibration absorption, but it fails to effectively absorb vibrations across the entire frequency range generated by electric motors
Solution Approach 1:
The helical blades are designed with specific geometric parameters (pitch, diameter, thickness) that enable them to dynamically respond to vibrations across different frequency ranges. The helical structure provides progressive engagement with the inner sleeve, creating a dynamic damping effect that adapts to varying vibration frequencies, achieving broad-spectrum vibration absorption without requiring multiple separate damping components.
Solution Approach 2:
By adjusting the geometric parameters of the helical blades (pitch, diameter, thickness, number of blades) and the material properties of the elastomeric components, the damping characteristics can be optimized to effectively absorb vibrations across the entire frequency range generated by electric motors. This parameter optimization allows a single simplified structure to achieve reliable broad-band vibration absorption.
3Ease of manufacture
If conventional bushing designs are used, then the component provides basic connection and support, but manufacturing becomes costly and complex
Solution Approach 1:
The bushing is segmented into distinct functional zones: the inner sleeve for structural connection and the external helical blades for vibration damping. This segmentation allows each part to be manufactured using optimized processes and materials, reducing overall manufacturing complexity and cost while efficiently utilizing materials for their specific functions.
Solution Approach 2:
The helical blades are constructed as flexible elastomeric structures that can be manufactured using molding processes. This flexible shell design reduces material consumption compared to rigid structures while maintaining the necessary damping performance, and the molding process simplifies manufacturing compared to traditional multi-step assembly methods.
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 bushing design achieves efficient vibration damping across the entire frequency range, reduces weight, and simplifies manufacturing, resulting in improved NVH properties and cost-effectiveness for electric motor support systems.
Implementation Method 1
The respective material or materials used are elastomeric. Such material(s) allow for a reversible displacement and reversible stretching of structural components of the bushing. A displacement of a structural part causes a dampened force in the opposite direction of the displacement, thereby effectively absorbing vibrational energy
Implementation Method 2
the at least two blades have a helically extending structure relative to an axis of the through hole
Data Source
AI summary
A bushing for an anti-vibration bracket is disclosed. The bushing comprises an outer structure and an inner sleeve. The outer structure comprises a connecting structure that comprises at least two blades connected to the inner sleeve. The outer structure is adapted to connect to an opening of an anti-vibration bracket. In embodiments, the inner sleeve comprises a through hole adapted to connect to an at least partially tube-shaped member. The at least two blades may have a helically extending structure relative to an axis of the through hole.