Capacitor Mounting Structure for Vibration-Stable ECU Housing Assembly
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Solution Overview
Problem
Existing mounting structures for capacitors in electronic control units (ECUs) fail to securely fasten the capacitor to the housing, leading to mechanical and climatic constraints, which can cause the electric connection to loosen and result in mechanical stress on the printed circuit board, affecting the reliability and performance of the ECU.
Innovation Solution
A mounting structure comprising a base with holding elements, towers for insulation displacement connectors, alignment support, and support surfaces, along with reinforcement ribs and grooves for a chemical substance, which is applied to securely attach the mounting structure to the housing, distributing the weight of the capacitor and reducing mechanical stress on the printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the capacitor is mounted directly on the printed circuit board using a simple mounting structure, then the device complexity is reduced, but the mechanical stability and reliability deteriorate under mechanical and climatic constraints
Solution Approach 1:
The mounting structure is segmented into distinct functional components: a base for PCB mounting, vertical towers for capacitor support, holding elements for securing the capacitor, and reinforcement ribs for structural strength. This segmentation allows each component to be optimized for its specific function while maintaining overall simplicity.
Solution Approach 2:
The mounting structure transitions from a planar PCB-mounted design to a three-dimensional structure with vertical towers rising from the base. This dimensional change provides structural rigidity and creates multiple attachment points, improving reliability without significantly increasing complexity.
2Stability of the object's composition
If the capacitor is securely fastened to the housing with a robust mounting structure, then the mechanical stability improves, but the device complexity increases
Solution Approach 1:
Multiple functions are merged into a single integrated mounting structure: the base provides PCB mounting and structural support, the towers provide capacitor support and positioning, the holding elements provide securing mechanisms, and the reinforcement ribs provide structural strength. This merging achieves high stability without proportionally increasing complexity.
Solution Approach 2:
The mounting structure combines different material properties within a single component: rigid sections for structural support, flexible holding elements for secure attachment, and reinforced zones for mechanical strength. This composite approach optimizes stability while maintaining manufacturing simplicity.
3Reliability
If the mounting structure is designed to withstand mechanical and climatic constraints, then the reliability improves, but the manufacturing complexity increases
Solution Approach 1:
The mounting structure is designed as a universal component that performs multiple functions: mechanical support, electrical isolation, capacitor positioning, and securing. This multi-functionality reduces the need for separate components, simplifying manufacturing while ensuring reliability under various constraints.
Solution Approach 2:
The design optimizes geometric parameters such as tower height, base dimensions, and reinforcement rib placement to achieve the required mechanical and climatic resistance. By carefully selecting these parameters, the structure meets reliability requirements while remaining manufacturable using standard processes.
4Stability of the object's composition
If the holding force is distributed uniformly across the capacitor, then the mechanical stability improves, but the device complexity increases
Solution Approach 1:
The holding elements are strategically positioned and designed with asymmetric characteristics to distribute force uniformly across the capacitor body. This asymmetric placement, optimized through design, achieves uniform force distribution without requiring complex symmetric arrangements of multiple components.
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 provides a mechanically stable and reproducible mounting system that withstands mechanical and climatic constraints, ensuring the capacitor remains securely attached and reduces stress on the printed circuit board, improving the reliability and performance of the ECU by distributing the weight and eliminating the need for direct mounting on the PCB.
Implementation Method 1
The applied chemical substance has fixing properties of the mounting structure to the inner surface of the cover of the housing. The chemical substance cab be for example in the form of an adhesive or a sealant.
Implementation Method 2
the mounting structure is injection moulded and the holding elements, the two towers, the alignment support, the support surfaces and the reinforcement ribs are integral parts of the injection moulded mounting structure
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a mounting structure (3) for a capacitor (4) and a method for mounting a mounting structure (3) to a housing (2) of an electronic control unit (1). The mounting structure (3) has a plurality of reinforcement ribs (33) formed in an upper surface of a base (30) of the mounting structure (3). Additionally, the mounting structure (3) has a centering feature (25) and an opening (26) formed in the base (30) of the mounting structure (3). For fastening, locating pins (24) engage the opening (26) and the centering feature (25).