Wedge Retainer for Printed Board Assembly Alignment and Thermal Transfer
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Solution Overview
Problem
Electronic units with closely spaced printed board assemblies (PBAs) face challenges in effective heat transfer and accurate alignment of pin-connectors with connector jacks, leading to potential pin damage during assembly and inadequate heat dissipation.
Innovation Solution
The system employs a retainer with sloped wedge segments and a compression spring to provide initial alignment guidance and locking force, ensuring accurate insertion and enhanced heat transfer by using solid, monolithic wedge segments with continuous surfaces for improved thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If PBAs are closely spaced to reduce size and weight, then the electronic unit achieves higher power density and smaller form factor, but heat transfer effectiveness deteriorates and pin alignment accuracy decreases
Solution Approach 1:
The retainer is segmented into multiple wedge segments (first wedge segment, second wedge segment) that can independently apply clamping force and facilitate heat transfer. Each wedge segment acts as a separate heat transfer pathway, increasing overall heat dissipation effectiveness while maintaining compact PBA spacing
Solution Approach 2:
The retainer structure serves multiple functions simultaneously: it provides mechanical locking to secure the PBA, applies clamping force through wedge segments for both alignment and heat transfer, and creates multiple thermal pathways from the PBA to the card guide. This multi-functionality resolves the contradiction by enabling effective heat transfer from closely spaced PBAs
2Volume of moving object
If retainers are made small to accommodate closely spaced PBAs, then the electronic unit achieves higher power density, but heat transfer capability deteriorates
Solution Approach 1:
The retainer is divided into multiple wedge segments that collectively provide sufficient heat transfer capability despite the overall small size. Each wedge segment contributes to heat transfer, and their combined effect compensates for the reduced retainer dimensions, enabling effective thermal management in compact configurations
Solution Approach 2:
The wedge segments are positioned and oriented to create thermal pathways in multiple dimensions from the PBA to the card guide. This multi-dimensional heat transfer approach maximizes thermal conductivity within the constrained retainer volume, resolving the contradiction between small size and heat transfer capability
3Volume of moving object
If card guides are made narrow to accommodate closely spaced PBAs, then the electronic unit achieves higher power density, but pin alignment accuracy deteriorates
Solution Approach 1:
The wedge segments apply preliminary clamping force and alignment guidance before the PBA is fully inserted into the card guide. This preliminary action ensures that pin-connectors are properly aligned with connector jacks even in narrow card guides, preventing damage during assembly while maintaining compact PBA spacing
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 solution ensures effective heat transfer from closely spaced PBAs and accurate alignment of pin-connectors, preventing damage during assembly while maintaining a compact design, with a locking force capable of transferring excess heat efficiently.
Implementation Method 1
a compression spring coupled to the housing and card guide member, wherein the compression spring is partially compressed to: bear against the first wedge segment; apply an initial spring-biased force to the first wedge segment
Implementation Method 2
a first wedge segment having a sloped planar contact surface; and a second wedge segment adjacent the first wedge segment and having a sloped planar contact surface
Implementation Method 3
the wedge segments are supported in the housing so that the sloped contact surface of the first wedge segment is adjacent the sloped contact surface of the second wedge segment
Implementation Method 4
wherein the wedge segments are devoid of holes in their respective sloped planar contact surfaces; wherein the wedge segments are supported in the housing so that the sloped contact surface of the first wedge segment is adjacent the sloped contact surface of the second wedge segment
Data Source
AI summary
Apparatus for guiding insertion and locking of a printed board assembly (PBA) in an electronic unit may include a housing, a first wedge segment having a sloped planar contact surface and a second wedge segment adjacent the first wedge segment and having a sloped planar contact surface. The first and second wedge segments may be devoid of holes in their respective sloped planar contact surfaces. The wedge segments may be supported in the housing so that the sloped contact surface of the first wedge segment is adjacent the sloped contact surface of the second wedge segment.