HVAC Motor Support Pin Structure for Tilt and Vibration Control
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Solution Overview
Problem
Existing motor supports for heating, ventilation, and air conditioning devices in motor vehicles face issues with the repeated stress on reduction pins leading to pin detachment and weakening, particularly when the attachment points are far from the lug, causing bending and potential separation.
Innovation Solution
The motor support design includes a projection on the pin that absorbs forces, distributing them across a wider area to reduce the risk of detachment, with a flexible base and rigid projections to limit bending, and a decoupling element made of elastomeric material to absorb vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the attachment points of the base on the second ring are far from the lug, then the assembly is easier, but the pin base bends and weakens under repeated stress
Solution Approach 1:
The invention adds a radial dimension to the force distribution by introducing a projection on the pin that extends radially from the longitudinal axis. This projection contacts the housing wall to distribute axial forces radially outward, transforming a one-dimensional force path (through the base) into a two-dimensional force distribution system that reduces bending moments on the base.
Solution Approach 2:
The projection acts as an intermediary element between the pin base and the housing wall. Instead of the base directly bearing the full axial load, the projection mediates by contacting the housing wall to provide additional support, thereby reducing the bending stress on the base while maintaining assembly ease.
2Ease of operation
If the pin base is made flexible to reduce bending, then assembly is easier, but the pin may detach under repeated stress
Solution Approach 1:
The invention applies local quality by making only the projection rigid while keeping the base flexible. The rigid projection provides reliable force distribution and prevents detachment, while the flexible base maintains ease of assembly. This localized rigidity-flexibility differentiation resolves the contradiction between operability and reliability.
Solution Approach 2:
The pin is designed as a composite structure with different mechanical properties in different regions: the base is made flexible material for ease of assembly, while the projection is made rigid material for reliability. This composite approach allows each part to have the optimal properties for its specific function.
3Reliability
If the projection is made rigid to prevent pin detachment, then reliability improves, but the base experiences more bending
Solution Approach 1:
The rigid projection contacts the housing wall to distribute axial forces in a radial direction, creating a two-dimensional force distribution system. This dimensional change reduces the bending moment on the base by providing an alternative force path through the projection-housing interface, thereby maintaining base strength despite the projection's rigidity.
Solution Approach 2:
The pin is segmented into two functional parts: the flexible base for assembly and the rigid projection for force distribution. This segmentation allows each part to be optimized independently - the base remains flexible to reduce bending while the projection is rigid to prevent detachment, resolving the contradiction between reliability and base strength.
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
This design enhances the mechanical strength of the pins, reduces the risk of detachment, and maintains easy assembly while effectively limiting the tilting and axial movement of the inner ring relative to the outer ring, thereby improving the durability and reliability of the motor support.
Implementation Method 1
A decoupling element is interposed between the inner ring and the outer ring. This decoupling element aims to limit, or even prevent, the transmission of vibrations and/or stresses generated due to the rotation of the electric motor
Implementation Method 2
a decoupling element made of elastomeric material to absorb vibrations
Data Source
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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) which protrudes from a first of the rings (20; 22) and is received in a housing (28) in the second of the rings (20; 22). An axial stop in the housing (28) limits the movement of the finger (26) in the housing (28) in the direction of the common axis (A) of the two rings (20; 22). The axial stop comprises a lug (32) extending from a base (38) of a pin (36) through a wall (45) of the housing. The base (38) of the pin (36) is attached to the second ring. The lug (32) has a protrusion (44) capable of abutting against the wall (45) of the housing (28).