Electronic interface unit for an electrical heating device of a heating, ventilation and/or air-conditioning system of a motor vehicle
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Solution Overview
Problem
Electrical heating devices in motor vehicles face challenges with the rigidity and flexibility of electronic interface housing covers, which are prone to deformation under mechanical stresses due to their large surface area, potentially damaging internal components during assembly and vehicle operation.
Innovation Solution
A cover for the electronic interface housing featuring pressing members and elements with offset transverse planes, providing sufficient rigidity to withstand vibrations while allowing flexible assembly and reducing stress on electronic components, made from plastics or metal materials for optimal mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the cover surface area is increased to house larger electronic components, then the housing capacity is improved, but the cover rigidity deteriorates and deformation occurs under mechanical stresses
Solution Approach 1:
The cover is segmented into multiple functional zones: a rigid peripheral frame structure providing overall strength, and a flexible central membrane area providing housing capacity. The frame is divided into ribs and reinforcing elements that create structural compartments, while the membrane portions between ribs provide flexibility and stress absorption.
Solution Approach 2:
The cover employs composite construction combining rigid materials (such as reinforced plastics or metal alloys) for the frame and ribs, with flexible materials (such as elastomeric membranes or flexible polymers) for the central housing areas. This composite structure allows different regions to perform different functions - the rigid frame maintains shape and resists deformation, while the flexible membrane provides expansion capacity and vibration damping.
2Stability of the object's composition
If the cover is made more rigid to resist vibrations, then the structural stability is improved, but the assembly flexibility deteriorates and damage to internal components may occur
Solution Approach 1:
The cover transitions from a static rigid structure to a dynamic semi-flexible structure that can adapt during assembly. The membrane portions are designed with controlled flexibility allowing them to deform elastically during the assembly process to accommodate component variations, then stabilize in their final position. This dynamic behavior enables easy assembly while maintaining structural integrity once assembled.
Solution Approach 2:
The flexible membrane areas act as pre-designed cushioning zones that absorb assembly stresses before they can transmit to internal electronic components. The membrane's inherent elasticity provides a buffer that prevents rigid impact forces from reaching sensitive components during assembly, eliminating the need for additional protective measures.
3Power
If the electronic components are made larger to support high voltage operation, then the thermal power delivery is improved, but the housing volume increases and cover deformation becomes more likely
Solution Approach 1:
The housing design applies local quality by concentrating the large electronic components in specific zones where they are best supported by the rigid frame structure, while allowing flexible membrane coverage in other areas. High-voltage components are positioned in structurally reinforced compartments, while lower-power components or connection terminals are located in flexible membrane areas that can accommodate their specific spatial and deformation requirements.
Data Source
AI summary
The invention, according to a first aspect, relates to a cover (4) of an electronic interface housing (300) of an electrical heating device for a motor vehicle, the cover (4) comprising at least one pressing member (44a, 44b) and at least one pressing element (45) which are configured to be in contact with a printed circuit board (5) when the cover (4) is fixed on the electronic interface housing (300), a free end of the at least one pressing member (44a, 44b) extending in a first transverse plane (451) and a free end (4501) of the at least one pressing element (45) extending in a second transverse plane (452), the at least one pressing member (44a, 44b) and the at least one pressing element (45) being arranged so that they project, in a direction perpendicular to a reference plane (400) of the cover (4), from an inner face of the cover (4) intended to face toward the inside of the electronic interface housing (300), characterized in that the first transverse plane (451) and the second transverse plane (452) are substantially parallel to one another and to the reference plane of the cover, strictly not coincident with one another or with the reference plane (400) of the cover (4), the second transverse plane (452) being, in a direction perpendicular thereto, closer to the reference plane (400) of the cover (4) than the first transverse plane (451).