Fluid Dynamic Bearing Spindle Axial Shock Resistance
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Solution Overview
Problem
Hard disk drives face performance degradation and mechanical issues due to vibrations and imbalances, leading to off-track errors and potential damage from shock-induced impacts, especially in compact designs with tight tolerances and high data tracks per inch.
Innovation Solution
The implementation of fluid dynamic bearings with compliant materials to dampen axial movements and reduce impact forces, combined with dual plane balancing to mitigate imbalances, helps stabilize the disk pack and prevent damage during operational shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If compact disk drive design is implemented to increase data storage density, then data tracks per inch increases, but sensitivity to vibrations and imbalances increases causing off-track errors
Solution Approach 1:
The patent changes the physical parameters of the spindle system by introducing fluid dynamic bearing operation and dual-plane balancing to alter the dynamic characteristics of the rotating assembly, thereby reducing vibration sensitivity without compromising storage density
Solution Approach 2:
The patent employs duplicate balancing planes that mirror each other to create symmetric counterbalancing effects, effectively canceling out vibrations and imbalances that would otherwise cause off-track errors in high-density storage configurations
2Volume of moving object
If tight tolerances are used in compact disk drive design, then device size is reduced, but mechanical issues from shock-induced impacts increase
Solution Approach 1:
The patent applies beforehand cushioning by using fluid dynamic bearing operation and dual-plane balancing to preemptively reduce the impact of shock-induced forces before they can cause mechanical damage to the tightly-toleranced compact drive components
3Stability of the object's composition
If fluid dynamic bearing operation is implemented, then axial movements are dampened, but device complexity increases
Solution Approach 1:
The patent employs fluid dynamic bearing operation that utilizes hydraulic principles to dampen axial movements, providing stability through fluid pressure and flow characteristics rather than complex mechanical structures
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 solution enhances the operational stability and shock resistance of hard disk drives, reducing the likelihood of data errors and mechanical damage by effectively managing vibrations and imbalances, thereby improving performance and extending component lifespan.
Implementation Method 1
fluid dynamic bearing with compliant material to dampen axial movements and reduce impact forces
Implementation Method 2
The softer material is preferably configured to reduce impact forces generated by engagement between the spindle and the bearing sleeve when the spindle is moved axially along the axis of rotation
Data Source
AI summary
Described herein is a disk drive with a fluid bearing having a sleeve defining a bore that extends through a portion of the sleeve along an axis defined by the bore. The sleeve can have a first contact surface that extends in a direction transverse to the axis. A spindle is rotationally received within the bore, and the spindle and the sleeve permit relative rotational movement when the spindle is positioned within the bore. The spindle has a stopper with a second contact surface that extends in a direction transverse to the axis when the spindle is positioned within the bore. A portion of at least one of the first and second contact surfaces includes a softer material than that of the spindle and the bearing sleeve, and the first and second contact surfaces are configured to engage each other upon relative axial movement between the spindle and the sleeve.