Transitional Load Beam Rail Structure for HDD Buckling Control
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Solution Overview
Problem
Modern suspension assemblies in hard disk drives face issues with load beam buckling at the dustpan forming location due to increased dustpan forming angles, which affect the stability and frequency response of the suspension.
Innovation Solution
The load beam design incorporates specific rail configurations, including rear, intermediate, and front rails, with controlled angles and a sag region, to enhance stability and improve frequency response, while a lifter tab and dustpan formation manage the slider's offset height and aerodynamic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If increased dustpan forming angles are used, then the slider offset height is improved, but load beam buckling occurs at the dustpan forming location
Solution Approach 1:
The load beam is divided into multiple distinct sections: a first section from the actuator mounting region to the dustpan forming location, and a second section from the dustpan forming location to the slider mounting region. This segmentation allows each section to be optimized independently - the first section can be designed with appropriate stiffness to prevent buckling at the dustpan forming location, while the second section accommodates the required offset height through controlled geometry and flexibility.
2Length of moving object
If increased dustpan forming angles are used, then the slider offset height is improved, but frequency response deteriorates
Solution Approach 1:
Different sections of the load beam are given different mechanical properties tailored to their specific functions. The first section has optimized stiffness and geometry to maintain structural integrity and frequency response characteristics, while the second section has controlled flexibility to achieve the required offset height. This local differentiation of mechanical properties allows the system to simultaneously achieve high offset height and maintain excellent frequency response.
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 new design reduces load beam buckling and enhances the frequency response of the suspension assembly, ensuring stable operation and improved performance in hard disk drives.
Implementation Method 1
a spring region between the actuator mounting region and the rigid section for providing the aforementioned spring force
Implementation Method 2
the head is typically located on a slider having an aerodynamic design so that the slider flies on an air bearing generated by the spinning disk
Implementation Method 3
The flexure is provided at the distal end of the load beam to which the slider is mounted and permits pitch and roll movements of the slider to follow disk surface fluctuations
Data Source
AI summary
Examples of a load beam are described herein that include a lifter tab extending towards a distal end, a dustpan defined by a dustpan forming line at a proximal end and the lifter tab at a distal end and a first and second plurality of rail sections separated by a longitudinal axis. The first and second plurality rail sections including a rear rail, an intermediate rail, and a front rail. The rear rail extends from a proximal end of the load beam to the first intermediate rail, the intermediate rail extends from the first rear rail to the dustpan forming line, and the front rail extends from the dustpan forming line to a proximal end of the lifter tab.