Annular Spacer Geometry for HDD Disk Flatness Under Clamping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The flatness of magnetic disks in hard disk drives deteriorates when fixed using conventional spacers, leading to potential fluttering and contact with ramp members during high-speed rotation.
Innovation Solution
An annular spacer with inclined regions on its main surfaces is used to maintain the flatness of magnetic disks, featuring a design that gradually decreases in height towards the outer circumferential surface, offsetting deformation caused by clamping pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional spacers are used to fix magnetic disks, then the magnetic disks can be positioned and fixed, but the flatness of the magnetic disks deteriorates
Solution Approach 1:
The spacer applies different local qualities to different regions: the main surface contacts the magnetic disk to provide positioning, while the inclined outer circumferential surface specifically counteracts clamping-induced warping. This localized structural feature addresses the flatness deterioration problem without compromising overall positioning stability.
Solution Approach 2:
The inclined surface is designed in advance to preemptively counteract the warping effect that will occur during clamping. By incorporating this anti-deformation structure before assembly, the spacer prevents flatness deterioration rather than correcting it after occurrence.
2Stability of the object's composition
If magnetic disks are fixed with clamping members, then the disks are secured in position, but fluttering occurs during high-speed rotation
Solution Approach 1:
The inclined surface on the spacer provides localized support that prevents warping of the magnetic disk's outer circumferential region. This localized structural reinforcement eliminates fluttering during high-speed rotation while maintaining overall positioning stability through the main surface contact.
3Stability of the object's composition
If magnetic disks are fixed using spacers, then the disks are spaced apart, but contact with ramp members occurs
Solution Approach 1:
The inclined surface specifically supports the outer circumferential region of the magnetic disk, preventing warping that would cause contact with ramp members. This localized support maintains proper spacing while eliminating harmful contacts during operation.
Data Source
AI summary
A hard disk drive includes ten or more magnetic disks, and an annular spacer. The annular space includes two main surfaces, an inner circumferential surface, an outer circumferential surface, and a chamfered surface present between the outer circumferential surface and each of the two main surfaces. The annular spacer is disposed such that one of the two main surfaces is in contact with one of the ten or more magnetic disks. At least one main surface of the two main surfaces includes an inclined region, and the inclined region is inclined in an outer circumferential region of the at least one main surface toward a boundary between the at least one main surface and the chamfered surface such that a surface height of the spacer gradually decreases toward the boundary.