Heatsink Fastener Assembly with Springs for Uniform Load
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Solution Overview
Problem
The existing methods for installing a heatsink in electronic assemblies often result in bowing due to corner loading, leading to uneven pressure distribution and potential damage, as well as air entrapment between the heatsink and thermal interface material, which can cause premature failure of the module.
Innovation Solution
A technique involving simultaneous force application to multiple fastener assemblies with springs and snap rings to uniformly load the heatsink, eliminating the need for cross-tightening and maintaining a consistent contact profile with the integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If corner loading mechanisms are used to attach heatsink, then heatsink can be securely attached to module, but heatsink base bows and creates gaps reducing thermal contact
Solution Approach 1:
The patent applies preliminary loading to the heatsink corners during assembly to pre-compress the thermal interface material before final attachment. This preliminary action ensures that the TIM is already compressed and conforming to the heatsink base geometry, preventing gap formation and maintaining thermal contact even as the heatsink base experiences some bowing under load.
2Stability of the object's composition
If cross-tightening of corner fasteners is used to gradually increase load, then even load distribution is achieved, but load concentration at corners still occurs and may crack module
Solution Approach 1:
The patent introduces preliminary loading mechanisms that apply controlled preload to the heatsink corners during assembly, before full operational load is applied. This preliminary action gradually compresses the TIM and allows the heatsink-base module assembly to settle into its final geometry, reducing shock loading and preventing corner cracks while maintaining even load distribution.
Solution Approach 2:
The patent employs compliant elements such as springs or elastomeric components in the corner loading mechanisms that provide cushioning during the attachment process. These elements absorb and distribute the loading forces gradually, preventing sudden load concentration that could crack the module corners while still achieving secure attachment.
3Shape
If fixture load is applied to center of heatsink during installation, then heatsink base remains flat during installation, but TIM is compressed to fixed height and air bubbles form when load is removed
Solution Approach 1:
The patent transitions from symmetric center-loading to asymmetric corner-loading during the installation process. By applying load at the corners rather than the center, the heatsink base is allowed to experience controlled bowing that maintains contact with the TIM across the entire interface, preventing air bubble formation while still achieving secure attachment.
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 approach reduces heatsink base deformation, ensures even thermal interface material distribution, and minimizes stress, thereby preventing damage and enhancing heat transfer efficiency.
Implementation Method 1
multiple fastener assemblies that each retain a respective fastener in a body of the heatsink... include a spring that is configured to receive the machine screw
Data Source
AI summary
A technique for installing a heatsink in an electronic assembly includes simultaneously applying force to multiple fastener assemblies that each retain a respective fastener in a body of the heatsink. The heatsink is then attached to the electronic assembly by actuating the fasteners while the force is simultaneously applied to the multiple fastener assemblies.