Hard Disk Head Suspension Reinforcing Parts for Shock and Windage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional head suspensions face a trade-off between improving shock property and reducing T1 windage, as thinner load beams enhance shock resistance but lead to swaying due to air disturbances, affecting positioning accuracy, and existing control systems struggle to suppress frequencies outside a limited range.
Innovation Solution
The head suspension design incorporates reinforcing parts between protrusions on the joint and the rigid part, increasing the load beam's rigidity and raising T1 frequency, thereby improving both shock property and T1 windage without degrading other properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the load beam is made thinner to improve shock property, then shock resistance is improved, but T1 windage increases causing the head suspension to sway due to air disturbance
Solution Approach 1:
The patent applies local quality by making the load beam thin overall to improve shock property, but adding localized reinforcing parts at specific positions (between protrusions on the joint and rigid part) to increase rigidity where needed. This allows the beam to be thin and lightweight while having localized reinforcement to suppress T1 mode sway caused by air disturbance.
Solution Approach 2:
The patent uses composite construction by combining the thin load beam with reinforcing parts made of rigid material. The reinforcement parts are integrated into the load beam structure to create a composite component that has both the low weight of a thin beam and the high rigidity of reinforced sections, thereby improving shock property while reducing T1 windage.
2Reliability
If the load beam is made thinner and shorter to improve shock property, then shock resistance is improved, but positioning accuracy deteriorates due to increased T1 frequency sway
Solution Approach 1:
The patent maintains the thin and short dimensions of the load beam for improved shock property, but adds localized reinforcing parts at strategic positions to increase rigidity. This localized reinforcement suppresses T1 mode sway that would otherwise degrade positioning accuracy, allowing the beam to remain thin while maintaining precision.
Solution Approach 2:
The patent addresses the positioning accuracy issue by adding reinforcing parts that extend in the across-the-width direction, perpendicular to the main length of the load beam. This dimensional approach increases rigidity in the critical sway direction without significantly increasing the overall length of the beam, thus maintaining shock property while improving positioning accuracy.
3Stability of the object's composition
If reinforcing parts are added to increase rigidity and raise T1 frequency, then T1 windage is reduced, but device complexity increases
Solution Approach 1:
The patent merges the reinforcing parts with the load beam structure by integrating them as unified components. The reinforcing parts are positioned between protrusions on the joint and rigid part, and are combined with the load beam to form an integrated structure, reducing the number of separate components and simplifying assembly while still providing the necessary rigidity increase.
Solution Approach 2:
The reinforcing parts are designed as thin-walled structures that provide high rigidity-to-weight ratios. These thin-walled reinforcements increase T1 frequency and reduce T1 windage without adding significant mass or complexity to the overall structure, maintaining a sleek and simple design while achieving the desired stability improvement.
Data Source
AI summary
A head suspension for a hard disk drive includes a base to be attached to a carriage of the head disk drive and turned around a spindle. A load beam includes a rigid part and a resilient part separated from the rigid part, to apply load onto a head that is arranged at a front end of the load beam to write and read data to and from a disk arranged in the hard disk drive. A base end of the rigid part is connected to the resilient part that is supported with the base. A flexure has read/write wiring patterns connected to the head, the flexure supporting the head and attached to the load beam. A joint is provided on the rigid part, to be connected to the resilient part. A protrusion formed on each side edge. Reinforcing part each expands and connects between each of the protrusions and the rigid part.