HVAC Motor Support With Radial End-Stops for Vibration Isolation
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Solution Overview
Problem
Existing motor supports for heating, ventilation, and air-conditioning devices in motor vehicles fail to effectively decouple vibrations and stresses generated by electric motors, leading to discomfort for vehicle occupants due to transmitted vibrations.
Innovation Solution
A motor support comprising two coaxial rings with a decoupling element, such as an elastomeric ring, and radial end-stops that limit relative movement between the rings, preventing vibrations from being transmitted, while maintaining a radial clearance to ensure satisfactory decoupling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a decoupling element is used to limit vibration transmission between the inner ring and outer ring, then vibration transmission is reduced, but the relative movement between the rings increases
Solution Approach 1:
A radial end-stop is introduced as an intermediary element between the inner ring and outer ring. This end-stop limits the relative radial movement between the rings while allowing the decoupling element to function. The end-stop acts as a mediator that constrains the movement without directly connecting the rings, thus maintaining vibration isolation while providing positional stability.
Solution Approach 2:
The motor support structure is segmented into functional zones: the decoupling element handles vibration isolation, while the radial end-stop handles movement limitation. This segmentation allows each component to specialize in one function, preventing the decoupling element from needing to simultaneously limit both vibration and radial movement, which would compromise its effectiveness.
2Stability of the object's composition
If the radial end-stop is fixed close to the other ring to limit relative movement, then movement limitation is improved, but the decoupling performance deteriorates
Solution Approach 1:
The radial end-stop is positioned as an intermediary component that maintains a controlled clearance from the ring. This clearance is sufficient to allow the decoupling element to absorb vibrations effectively, while the end-stop still prevents excessive radial movement. The intermediary positioning resolves the conflict between movement limitation and vibration isolation.
3Ease of manufacture
If the motor support structure is simplified for easier production, then manufacturing complexity is reduced, but the ability to simultaneously achieve vibration decoupling and movement limitation deteriorates
Solution Approach 1:
The solution segments the functional requirements into two simple components: a decoupling element for vibration isolation and a radial end-stop for movement limitation. This segmentation avoids the need for complex integrated structures, maintaining ease of manufacture while reliably achieving both vibration decoupling and movement limitation functions.
Solution Approach 2:
The radial end-stop serves as a simple intermediary component that can be easily manufactured and integrated. Its straightforward geometry and function (limiting radial movement while maintaining clearance) make it easy to produce, yet it effectively resolves the conflict between movement limitation and vibration isolation performance.
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 effectively limits the transmission of vibrations and stresses, enhancing occupant comfort by allowing relative movement and maintaining structural integrity, thus improving the reliability of the motor support.
Implementation Method 1
a decoupling element for decoupling the two coaxial rings
Implementation Method 2
This decoupling element is intended to limit, or even to prevent, the transmission of vibrations and/or stresses generated by the rotation of the electric motor
Data Source
AI summary
The motor support (16) for a motor-fan unit of a ventilation installation for a vehicle comprises: two coaxial rings (20; 22), including an inner ring (20) capable of receiving one or more elements of the motor and an outer ring (22) capable of fixing fastened to a housing forming a structural element, a decoupling element (24) between the two coaxial rings (20; 22); and a means (44) for limiting the relative movement of one of the two rings (20; 22) relative to the other, in a plane normal to the common axis (A) of the two rings (20; 22), comprising at least one radial abutment (44) fastened to one of the two rings (20; 22), with a radial clearance between the radial abutment (44) and the other of the two rings (20; 22).