Vehicle PCB Capacitor Pedestal Mounting Against Vibration Breakage
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Solution Overview
Problem
Capacitors in electronic units mounted on vehicles are prone to breakage due to vibrations from rotating electric machines and road surfaces, particularly at the lead portion where stress concentrates.
Innovation Solution
A pedestal is interposed between the capacitor and the printed board, with the capacitor and pedestal adhered using adhesive on their outer and inner peripheral surfaces perpendicular to the board surface, to support the capacitor and suppress vibration-induced swing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a capacitor is mounted directly on a printed board, then the device complexity is reduced, but the capacitor is easily broken by vibration
Solution Approach 1:
A pedestal is introduced as an intermediary component between the capacitor and the printed board. The pedestal has a wider base than the capacitor body, creating a stable support structure that prevents the capacitor from swinging during vibration, thereby solving the contradiction between simple mounting and reliable operation.
2Quantity of substance
If a capacitor is tall with large protruding length, then the capacitance value is increased, but the stress concentration at lead portion is increased
Solution Approach 1:
The pedestal acts as a cushioning support structure that prevents excessive swinging of the tall capacitor body during vibration. By providing this protective support in advance, the stress concentration at the lead portion is reduced, preventing breakage while maintaining the required capacitance value.
3Strength
If projection welding is used to connect capacitor terminal to electrode plate, then the connection strength is improved, but it is difficult to apply to capacitors mounted on printed board
Solution Approach 1:
The pedestal serves as an intermediary mounting structure that allows the capacitor to be securely attached to the printed board without requiring projection welding. The adhesive bonding method used with the pedestal achieves reliable connection while being applicable to standard capacitor mounting processes.
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 configuration effectively reduces the likelihood of capacitor breakage by stabilizing the capacitor against vertical and rotational vibrations, ensuring reliable operation of electronic units in vehicles.
Implementation Method 1
The capacitor and the pedestal are adhered by an adhesive on an outer peripheral surface of the capacitor and an inner peripheral surface of the pedestal
Data Source
AI summary
An electronic unit to be mounted on a vehicle, the electronic unit including: a printed board to which a plurality of electronic components are attached; a capacitor which is one of the electronic components and is longer in a vertical direction perpendicular to a surface of the printed board than in a lateral direction parallel to the surface of the printed board in a state of being attached to the printed board; and a pedestal interposed between the capacitor and the printed board and configured to support the capacitor, wherein the capacitor and the pedestal are adhered by an adhesive on an outer peripheral surface of the capacitor and an inner peripheral surface of the pedestal which are perpendicular to the surface of the printed board.