HVAC Latching Receiving Opening with Segmented Bending Portions
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Solution Overview
Problem
Existing heating, ventilation, and air-conditioning devices for motor vehicles face durability issues due to material overstressing in latching connections, leading to inconsistent latching and unlatching forces over time, which compromises the reliability and longevity of the connections.
Innovation Solution
The design incorporates a flexurally rigid second peripheral portion and bending portions within the receiving opening, allowing controlled deformation during latching without material overstressing, ensuring consistent latching and unlatching forces and a secure connection, with optional reinforcing ribs and varying stiffness along the mounting axis for enhanced durability and ease of production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving opening is widened by bending the edge during latching, then the latching connection can be formed, but the material is locally overstressed which reduces durability and consistency of latching forces
Solution Approach 1:
The receiving opening's peripheral portion is segmented into distinct functional zones: a first peripheral portion that is flexurally rigid and resistant to deformation, and a second peripheral portion that is designed to bend elastically during latching. This segmentation allows the structure to concentrate deformation in specific areas while maintaining overall integrity, thereby reducing local stress on critical material regions and improving durability of the latching connection
Solution Approach 2:
Different peripheral portions of the receiving opening are given different mechanical properties: the first peripheral portion is made flexurally rigid to maintain structural integrity, while the second peripheral portion is made more compliant to accommodate elastic bending during latching. This local differentiation of material properties allows the structure to achieve both strength and flexibility where needed, reducing overall stress concentration
2Reliability
If the edge of the receiving opening is bent to form the latching connection, then the latching can be achieved, but the latching and unlatching forces become inconsistent after multiple operations
Solution Approach 1:
The receiving opening is pre-configured with specific geometric features including arcuate peripheral portions with predetermined radii of curvature. These preliminary geometric arrangements ensure that during latching operations, the material deforms in a controlled and repeatable manner, maintaining consistent latching and unlatching forces even after multiple operations. The preliminary shaping prevents unpredictable deformation that would occur with simple bending
Solution Approach 2:
The latching mechanism incorporates dynamic elements where the peripheral portions can elastically deform during latching and then return to their original position. The arcuate geometry and material selection allow the structure to adapt dynamically to loading conditions while maintaining repeatable force characteristics across multiple latching cycles, ensuring consistent performance over time
3Ease of manufacture
If the receiving opening is designed with uniform rigidity, then the structure is simple to manufacture, but it cannot provide controlled deformation during latching without material overstressing
Solution Approach 1:
The receiving opening features localized variations in wall thickness and cross-sectional geometry at specific peripheral portions. These local modifications create zones of controlled flexibility without requiring complex overall restructuring. The varying wall thicknesses can be implemented using standard manufacturing techniques like injection molding variations, maintaining ease of manufacture while achieving the necessary differential rigidity for durable latching
Solution Approach 2:
The peripheral portions of the receiving opening incorporate arcuate geometries with specific radii of curvature. These curved features naturally distribute stress more evenly during deformation compared to sharp angles, and can be easily formed using conventional molding or bending processes. The curvature provides inherent stress distribution that enhances durability without adding manufacturing complexity
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 results in a durable and reliable latching connection that maintains consistent latching and unlatching forces even after multiple operations, ensuring secure component alignment and long service life, while allowing for adjustable mounting and demounting forces and simplified production.
Implementation Method 1
The bending occurs here only elastically such that, even after a number of latching operations, the same forces always act during latching and unlatching
Data Source
AI summary
A heating, ventilation and/or air-conditioning device for a motor vehicle, including a first device component (10) which has a latching receptacle (12) with a receiving opening (14) for inserting a rigid latching tongue of a second device component which extends substantially along a mounting axis (24), wherein a first peripheral portion (16) of the receiving opening (14) is formed by a wall portion of the first device component (10) and wherein a second peripheral portion (18) of the receiving opening (14) that is opposite to the first peripheral portion (16) is designed to be substantially flexurally stiff, and third and fourth peripheral portions (20,22) which are situated peripherally between the first peripheral portion (16) and the second peripheral portion (18) are designed as a bending portions.