HVAC Motor Support Peg Structure for Vibration and Tilt Limiting
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Solution Overview
Problem
Existing motor supports for heating, ventilation, and air-conditioning devices in motor vehicles are prone to peg detachment due to repeated forces from projecting fingers on spigots, leading to potential mechanical failure and vibration transmission.
Innovation Solution
The proposed motor support features a decoupling element and a finger with a projection that absorbs forces, reducing the risk of peg detachment by distributing the forces across a wider area, thereby enhancing mechanical strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the base of the peg is fixed to the second ring at two points remote from the spigot, then the peg can be securely attached to the second ring, but the repeated forces from the projecting finger on the spigot cause the base to bend and weaken, ultimately leading to detachment
Solution Approach 1:
The force transmission path is segmented by introducing a projection on the spigot that transfers forces to the receptacle wall, separate from the base's attachment points on the second ring. This segmentation prevents force concentration at the base, eliminating bending while maintaining secure attachment.
Solution Approach 2:
The projection on the spigot acts as an intermediary element that mediates the force transmission between the finger and the second ring. Instead of forces passing directly through the base, the projection transfers them to the receptacle wall, protecting the base from bending stresses.
2Ease of manufacture
If the spigot extends through the wall of the receptacle with the base fixed remote from the spigot, then the peg can be attached to the second ring, but the forces from the finger on the spigot cause peening of the peg and detachment
Solution Approach 1:
The force transmission is segmented so that operational forces from the finger are directed to the projection and receptacle wall, separate from the base attachment structure. This maintains the simple assembly process while preventing force concentration that causes peening.
Solution Approach 2:
The projection on the spigot provides beforehand cushioning by being positioned to absorb and distribute forces before they can cause peening damage to the peg body. This preventive measure protects the peg's mechanical integrity during operation.
3Adaptability or versatility
If the projecting finger is allowed to move freely in the receptacle, then the decoupling element can accommodate relative movement between rings, but excessive tilting of the inner ring relative to the outer ring occurs
Solution Approach 1:
The receptacle has non-uniform geometry with a larger diameter portion and a smaller diameter portion, creating local quality variations that provide different degrees of freedom for the finger. This allows adequate relative movement while limiting excessive tilting through the smaller diameter section.
Solution Approach 2:
The finger's movement characteristics are made dynamic through the varying receptacle geometry, allowing free movement within the larger diameter portion for normal operation, while the smaller diameter portion provides dynamic limitation against excessive tilting movements.
Data Source
AI summary
A motor support comprises two coaxial rings (20; 22) and an element for limiting the tilting of the inner ring relative to the outer ring. The limiting element comprises a finger (26) projecting from a first of the rings (20; 22) and housed in a receptacle (28) in the second of the rings (20; 22). An axial end-stop in the receptacle (28) limits the movement of the finger (26) in the receptacle (28) in the direction of the common axis (A) of the two rings (20; 22). The axial end-stop comprises a spigot (32) extending from a base (38) of a peg (36) through a wall (45) of the receptacle. The base (38) of the peg (36) is fixed to the second ring. The spigot (32) has a projection (44) capable of abutting against the wall (45) of the receptacle (28).