Motherboard Bracket Design Reduces Fastener Torque
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Solution Overview
Problem
Conventional server expansion card assemblies experience damage due to excessive torque from long fasteners, which can cause unintended stress on the circuit board during installation.
Innovation Solution
A motherboard assembly and bracket design that uses a second mount plate spaced apart from the circuit board, allowing for shorter fasteners to be used, reducing torque and preventing damage by fixing the expansion card assembly through the bracket rather than directly to the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If long fasteners are used to fix the expansion card assembly directly to the circuit board, then the expansion card assembly can be securely fixed, but the torque applied to the circuit board increases causing potential damage
Solution Approach 1:
The patent introduces a bracket as an intermediary component between the expansion card assembly and the circuit board. The bracket includes a first mount plate fixed to the circuit board and a second mount plate that holds the expansion card assembly, with the plates spaced apart to accommodate shorter fasteners. This mediator structure enables secure fixation while reducing the torque transmitted to the circuit board.
Solution Approach 2:
The fixation system is segmented into multiple components: the circuit board, the bracket (with first and second mount plates), and the fasteners. By dividing the direct fixation path into separate stages (circuit board to first mount plate, then to second mount plate holding expansion card), the system reduces stress concentration and torque transmission to the vulnerable circuit board.
2Object-affected harmful factors
If the bracket structure with spaced mount plates is used, then the torque on the circuit board is reduced, but the device complexity increases
Solution Approach 1:
The bracket is designed as a multi-functional component that simultaneously provides structural support, positioning, and torque isolation. The first mount plate serves as a mounting surface for the bracket itself, while the second mount plate provides the expansion card assembly fixation point, and the spacing between plates inherently provides torque reduction. This consolidation of multiple functions into a single bracket structure minimizes overall system complexity.
Data Source
AI summary
The invention provides a motherboard assembly. The motherboard assembly includes a circuit board, an expansion card connector, an expansion card assembly, a bracket and a fastener. The expansion card connector is disposed on the circuit board. The expansion card assembly includes a cage, an adapter card, and at least one expansion card. The adapter card is installed on the cage and includes an electrical connector. The electrical connector is inserted into the expansion card connector, and the expansion card is installed on the adapter card. The bracket includes a first mount plate and a second mount plate connected to each other. The first mount plate is fixed on the circuit board, and the second mount plate is located farther away from the circuit board than the first mount plate. The fastener is disposed through the cage and screwed into the second mount plate of the bracket.