Spindle Shaft Fixation With Inclined Faces Against Tilt
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Solution Overview
Problem
The spindle shaft in recording devices is prone to inclination due to insufficient fixation, leading to reduced positioning accuracy of heads and affecting information read and write operations.
Innovation Solution
A recording device design where the fastener and cover engage through inclined faces intersecting the fastening direction, using resilient or non-resilient tapered portions to stabilize the spindle shaft fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spindle shaft is fixed to the cover by frictional force through screw fastening, then the fixation is simple and easy to implement, but the fixation reliability deteriorates under impact loads causing spindle shaft inclination
Solution Approach 1:
The patent applies a tapered (conical) shape to the engagement surface of the fastener instead of a conventional cylindrical shape. This curvature allows the fastener to engage the spindle shaft through both axial fastening force and radial frictional force generated by the tapered surface, significantly improving fixation reliability under impact loads while maintaining ease of manufacture
Solution Approach 2:
The tapered fastener is designed to generate preliminary radial clamping force on the spindle shaft through its inclined surface geometry. This preliminary action creates a pre-compression effect that enhances the frictional fixation before any impact occurs, preventing spindle shaft inclination from the outset
2Device complexity
If the spindle shaft is fixed using conventional screw fastening, then the structure is simple, but positioning accuracy of heads deteriorates due to spindle shaft inclination under impact
Solution Approach 1:
The tapered fastener geometry converts a simple screw fastening structure into an enhanced fixation mechanism. The conical shape provides both axial and radial fixation components, maintaining structural simplicity while eliminating spindle shaft inclination that would otherwise degrade head positioning accuracy
3Device complexity
If the spindle shaft is held by frictional force only, then the fixation method is simple, but the spindle shaft inclines when force exceeding frictional force acts by impact
Solution Approach 1:
The tapered fastener transforms a simple friction-based fixation into a combined mechanical-interference and friction fixation system. The inclined surface generates radial clamping force that stabilizes the spindle shaft against impact loads, maintaining stability without complicating the overall fixation method
Solution Approach 2:
The tapered geometry creates preliminary radial compression on the spindle shaft, establishing a pre-loaded frictional connection that resists impact forces before they occur, thereby maintaining spindle shaft stability under dynamic conditions
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 design effectively suppresses spindle shaft inclination, ensuring stable fixation and maintaining accurate head positioning even under impact, thereby enhancing data recording reliability.
Implementation Method 1
The other side of the spindle shaft in the axial direction is, however, held in a fixed state by frictional force with respect to the cover based on the fastening with the screw.
Data Source
AI summary
Provided is a recording device capable of preventing inclination of a spindle shaft. It includes a base 7 accommodating a disk 5, a cover 9 attached to the base 7, a spindle shaft 15 rotatably supporting the disk 5, one side in an axial direction of which is fixed to the base 7 and the other side in the axial direction of which is fixed to the cover 9, and a screw 19 fixing the other side of the spindle shaft 15 in the axial direction to the cover 9 by fastening and having a screw head portion 19 that contacts a fastened portion 25 of the cover 9, wherein one or both of the screw head portion 19 and the fastened portion 25 have inclined faces 27a, 27b inclined relative to a fastening direction of the screw 19, and the screw head portion 21 and the fastened portion 25 engage with each other through contact at the inclined faces 27a, 27b in an intersecting direction relative to the fastening direction.