Hard Disk Drive Embedded Gasket Base for Larger Disk Sealing
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Solution Overview
Problem
Increasing disk diameters in hard disk drives (HDDs) narrows the gasket seal space at the 3 o'clock, 9 o'clock, and 12 o'clock positions, making sealing difficult and increasing power consumption due to windage drag, especially in helium-based drives.
Innovation Solution
Embedding a gasket seal within a groove in the baseplate sidewall, allowing the cover to engage with the embedded gasket, providing a suitable sealing mechanism even for larger disk diameters and enabling wider disk shroud clearance for reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If disk diameter is increased to provide more storage capacity, then storage capacity is improved, but gasket seal space becomes narrower making sealing difficult
Solution Approach 1:
The gasket seal is transitioned from a surface-mounted configuration to an embedded three-dimensional structure within a groove in the baseplate sidewall. This dimensional change allows the seal to be positioned at different depths, effectively utilizing vertical space to maintain sealing capability as disk diameter increases.
Solution Approach 2:
The gasket seal is nested within a groove structure in the baseplate sidewall, with the seal positioned inside the groove cavity. This nesting arrangement allows the sealing element to be contained within the baseplate structure itself, maintaining effective sealing space even as the overall disk diameter increases.
2Area of moving object
If disk diameter is increased to provide more storage capacity, then storage capacity is improved, but windage drag increases leading to higher power consumption
Solution Approach 1:
The disk shroud clearance is made non-uniform, with specifically wider clearances at the 3 o'clock, 9 o'clock, and 12 o'clock positions where the groove and embedded gasket are located. This local optimization of clearance dimensions reduces windage drag in critical areas, lowering power consumption while maintaining the overall increased disk capacity.
3Reliability
If gasket seal is applied on the baseplate surface, then sealing is achieved, but manufacturing complexity increases due to precise alignment requirements
Solution Approach 1:
The groove structure is pre-formed as an integrated feature of the baseplate during baseplate manufacturing. The gasket seal is then embedded into this pre-existing groove structure, eliminating the need for complex post-manufacturing alignment operations and simplifying the overall assembly process while maintaining reliable sealing.
Data Source
AI summary
A hard disk drive enclosure base includes a groove extending from an internal sidewall surface into the sidewall and a gasket seal embedded in the groove. In the context of progressively larger recording disk diameters, corresponding expanding disk shrouds, and corresponding narrower baseplate sidewalls, such a baseplate is configured to enable a first cover to physically engage with a portion of the embedded gasket seal that extends inward away from the sidewall surface, thereby providing a suitable drive sealing mechanism.