Disk Drive Actuator Pivot Bearing Adsorptive Element
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Solution Overview
Problem
The outgassing and migration of lubricant molecules from the actuator pivot bearing cartridge in magnetic hard disk drives can contaminate internal components, reducing the reliability and lifetime of the disk drive and threatening stored data.
Innovation Solution
Incorporating an adsorptive element, such as silica gel or activated carbon, within the actuator pivot bearing to block the diffusion path of lubricant molecules, thereby reducing outgassing and migration, which is achieved by positioning the adsorptive material between the fixed inner bearing shaft and the rotatable outer bearing sleeve or within the internal cartridge space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lubricant is used in the actuator pivot bearing cartridge, then the bearing operation is improved, but lubricant outgassing and migration contaminate other components
Solution Approach 1:
An adsorptive element is introduced as an intermediary component within the pivot bearing cartridge. This element is positioned between the lubricant source and the external environment, actively adsorbing lubricant molecules that attempt to migrate or outgas. The adsorptive element serves as a mediator that captures harmful substances before they can contaminate other disk drive components, thereby resolving the contradiction between maintaining reliable bearing operation and preventing lubricant contamination.
2Object-generated harmful factors
If the actuator pivot bearing cartridge is sealed to contain lubricant, then contamination is reduced, but the bearing functionality is compromised
Solution Approach 1:
The pivot bearing cartridge is designed with localized functional zones. The adsorptive element is strategically positioned in specific areas where lubricant migration is most problematic, rather than completely sealing the entire bearing structure. This localized approach allows the bearing to maintain full functionality and lubricant access where needed, while simultaneously providing contamination prevention in critical areas through the targeted placement of adsorptive material.
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
The adsorptive element effectively minimizes lubricant contamination, enhancing the reliability and longevity of the disk drive by restricting the diffusion path and adsorbing lubricant molecules, thus protecting sensitive components.
Implementation Method 1
Incorporating an adsorptive element, such as silica gel or activated carbon, within the actuator pivot bearing to block the diffusion path of lubricant molecules
Data Source
AI summary
An actuator pivot bearing is disposed at least partially within a pivot bearing bore of a disk drive actuator. The actuator pivot bearing includes a fixed inner bearing shaft having a lower portion that is attached to the disk drive base. It may also have a rotatable outer bearing sleeve that is attached to the actuator body. The actuator pivot bearing also includes an adsorptive element (e.g. comprising activated carbon, silica gel, zeolites) disposed between the fixed inner bearing shaft and an inner surface of the pivot bearing bore. In certain embodiments, the adsorptive element may optionally be disposed within an actuator pivot bearing internal cartridge space. A restricted clearance between the rotating and fixed bearing components may partially block a diffusion path from the pivot bearing lubricant to the read head. The adsorptive element may be disposed adjacent that restricted clearance.