Hard Disk Drive Pivot Shaft Structure for Helium Sealability
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Solution Overview
Problem
Existing hard disk drive devices face challenges in preventing blow holes in pivot shafts while ensuring sealability, particularly when increasing housing height for higher capacity and using helium gas for lower power consumption.
Innovation Solution
A base design with a pivot shaft integrated as a first shaft part formed integrally with the bottom plate and a second shaft part fixed to the first shaft part, ensuring a secure attachment of the cover, using a thermosetting adhesive and press-fitting to prevent blow holes and enhance sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the housing height is increased to increase capacity, then the storage capacity is improved, but the length of the pivot shaft increases which causes blow holes to occur
Solution Approach 1:
The pivot shaft is divided into two separate parts: a first shaft part that is fixed to the base, and a second shaft part that is fixed to the cover. This segmentation allows each part to be manufactured independently with controlled length, preventing blow holes while maintaining the increased housing height for higher storage capacity.
2Manufacturing precision
If the base and pivot shaft are formed as separate members, then blow hole occurrence is suppressed, but the sealability of the housing deteriorates
Solution Approach 1:
The pivot shaft is segmented into two parts that are separately manufactured to prevent blow holes, while the first shaft part is integrally formed with the base to maintain sealability. This selective segmentation resolves the contradiction between preventing blow holes and ensuring housing sealability.
Solution Approach 2:
The first shaft part is merged with the base as an integral structure, ensuring that the sealability of the housing is maintained while still allowing the pivot shaft functionality to be divided into two parts for blow hole prevention.
3Reliability
If the base and pivot shaft are integrally formed, then the sealability of the housing is ensured, but blow holes are likely to occur in the pivot shaft
Solution Approach 1:
The pivot shaft is divided into two separate parts that are manufactured independently and then assembled. This segmentation prevents blow holes from occurring during the manufacturing process while the first shaft part remains integrally formed with the base to ensure sealability.
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
Prevents blow holes in the pivot shaft and improves the sealability of the hard disk drive device, maintaining a hermetically sealed interior space for helium gas, thus enhancing performance and reliability.
Implementation Method 1
a second shaft part fixed to the first shaft part in a lower end region
Implementation Method 2
using a thermosetting adhesive and press-fitting to prevent blow holes and enhance sealability
Data Source
AI summary
A base serves as a part of a housing of a hard disk drive device. The base includes a bottom plate part and a pivot shaft extending in a top-bottom direction. The pivot shaft includes a first shaft part formed integrally with the bottom plate part, and a second shaft part fixed to the first shaft part in a lower end region, a cover of the hard disk drive device being attached to the second part shaft in an upper end region.