Electric Motor Mount With Micro-Cellular Urethane for NVH Damping
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Solution Overview
Problem
Vehicles experience undesirable noise, vibration, and harshness (NVH) conditions due to external and motor-generated forces, which existing mounting systems fail to effectively attenuate, leading to suboptimal operational performance.
Innovation Solution
A vibration-attenuating mounting assembly featuring an inner tube with tapered surfaces, a micro-cellular urethane damping element with radially extending projections and protuberances, and an outer shell that compresses these features to absorb vibrations, providing enhanced damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional mounting systems are used to attach the motor to the vehicle frame, then the structure is simple and easy to manufacture, but the vibration attenuation performance is insufficient leading to undesirable NVH conditions
Solution Approach 1:
The mounting assembly is segmented into multiple functional components: an outer shell, an inner tube assembly, and a damping element with specific geometric features (projections and protuberances). This segmentation allows each component to perform its specialized function while collectively achieving superior vibration attenuation without excessive overall complexity
Solution Approach 2:
The damping element utilizes micro-cellular urethane material, which is a composite material structure that combines the benefits of cellular foam (energy absorption) with urethane properties (damping characteristics). This composite material approach enables effective vibration attenuation while maintaining a compact design
2Object-affected harmful factors
If the outer shell compresses the projections and protuberances of the damping element, then vibration damping is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The damping element features localized geometric variations with specific projections and protuberances at defined positions. This local quality approach allows the compression force to be distributed to specific high-damping zones rather than requiring uniform precision throughout the entire assembly, reducing overall manufacturing precision requirements
Solution Approach 2:
The damping element is pre-configured with projections and protuberances that are designed to be compressed by the outer shell during normal operation. This beforehand cushioning design ensures that vibration energy is absorbed before it can propagate to the vehicle frame, reducing noise attenuation requirements for other components
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 mounting assembly effectively reduces vibrations and noise by utilizing micro-cellular urethane's unique damping properties, offering improved NVH attenuation across a range of frequencies and amplitudes, enhancing vehicle operational stability and comfort.
Implementation Method 1
a damping element coupled to the inner tube; wherein the damping element is formed of a micro-cellular urethane material
Implementation Method 2
the damping element is formed of a micro-cellular urethane material
Implementation Method 3
the outer shell is configured to compress at least one of the plurality of projections or at least one of the protuberances
Data Source
AI summary
A mounting assembly for a vehicle that includes an inner tube, a damping element couped to the inner tube, and an outer shell that houses each of the inner tube and the damping element. The damping element is formed of a micro-cellular urethane material. The inner tube includes a first tapered surface, a second tapered surface, a third tapered surface, and a fourth tapered surface, and the damping element includes a first axially extending projection that extends outward from the first tapered surface, a second axially extending projection that extends outward from the second tapered surface, a third axially extending projection that extends outward from the third tapered surface, and a fourth axially extending projection that extends outward from the fourth tapered surface. The outer shell compresses each of the first, second, third, and fourth axially extending projections toward a respective tapered surface.