Disk Device Gasket Alignment with Cover Burrs for Sealing
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Solution Overview
Problem
Existing disk devices face challenges in achieving optimal airtightness and reducing rotational resistance, particularly in sealing low-density gases within the housing to improve performance, as conventional sealing methods can lead to leaks and increased processing complexity.
Innovation Solution
The implementation of a housing design featuring a base with a rectangular shape and a first cover with a gasket on one surface and a burr on the other, where the gasket is aligned to the burr, along with a second cover welded to the base, allows for efficient sealing using a fixed-width packing that maintains airtightness across the entire circumference without increasing processing steps or risk of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing methods are used to attach the cover to the base, then the housing can be enclosed, but airtightness is compromised leading to leaks
Solution Approach 1:
The burr is formed on the cover surface before assembly through press working during the manufacturing process. This preliminary formation of the burr structure enables the subsequent gasket to be properly positioned and compressed, ensuring effective sealing while maintaining manufacturing efficiency
Solution Approach 2:
A gasket is introduced as an intermediary sealing element between the cover and base. The gasket is specifically positioned on the burr side of the cover, where it is compressed by the burr structure to create an effective seal that prevents gas leakage while maintaining the integrity of the housing enclosure
2Reliability
If the gasket is not aligned with the burr, then assembly is simpler, but packing width varies causing leaks
Solution Approach 1:
The burr is pre-formed on the cover at the precise location where the gasket will be positioned. This preliminary structuring of the cover surface guides the gasket to the correct position during assembly, ensuring that the packing width remains uniform throughout the sealing interface
Solution Approach 2:
The burr creates an asymmetric surface feature on the cover that breaks the symmetry of the sealing interface. This asymmetric structure ensures that the gasket is compressed uniformly at the burr location, preventing variations in packing width that would otherwise lead to leakage
3Productivity
If low-density gas is sealed in the housing to reduce rotational resistance, then disk and head performance improve, but airtightness must be maintained to prevent leaks
Solution Approach 1:
The gasket acts as an intermediary sealing barrier that retains the low-density gas within the housing. By positioning the gasket on the burr side of the cover, the sealing interface is optimized to prevent gas leakage, thereby maintaining the improved rotational efficiency of the disk and head components
Solution Approach 2:
The burr structure is pre-formed to create the optimal sealing geometry before the housing is enclosed and filled with low-density gas. This preliminary preparation ensures that when the gas is introduced, the sealing interface is already configured to maintain airtightness, preventing gas escape and preserving rotational performance
Data Source
AI summary
According to one embodiment, a disk device includes a housing including a base including a sidewall, and a first cover on a surface of the sidewall, and a discoidal recording medium in the housing. The first cover includes a first surface, a second surface on an opposite side to the first surface, and a side portion. The second surface includes a packing on a peripheral portion thereof. The side portion includes a burr on the second surface side and the packing is aligned to the burr.