Clamshell Design for Bypass Channel Wall in Hard Disk Drive Applications
Publication Date: 2014-Sep-12
The IP.com Prior Art Database
For enterprise class HDD’s, the turbulence generated by the internal airflow is a significant contributor to the overall TMR budget. To improve the performance and reliability of read/write functions, it is important to reduce the turbulent effects of the airflow in the disk pack and around the HSA assembly.
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Dual-material design of load/unload ramp spoiler for improving non-operational shock performance
Integrated spoiler-finger ramp is implemented to reduce NRRO and track-follow TMR caused by unsteady airflow. With spindle motor/disk packs rotating at 15k RPM, flow induced vibrations are the major detractor to disk drive performance. With newer slider designs (Femto) that have much smaller air-bearing surface, the load/unload (L/UL) ramp becomes an essential component in disk drive to prevent head/disk damage from non-operational shocks. The presence of the L/UL ramp at the OD of the disk makes the effects of air flow even more problematic when reading/writing at the OD. The L/UL ramp acts aerodynamically as an air break, consuming substantial aerodynamic power. The intent of the integrated spoiler-ramp is to modify the existing L/UL ramp so that it suppresses FIV of (especially) the sensitive suspension, ILS and slider components. At the same time the integration of spoiler finger into the ramp design reduces cost manufacturing assembly time and is more effective in suppressing flow induced vibration of the slider, ILS trace and suspension components because of its flow stagnation (upstream wake). Such an implement has been used effectively in both bypass and damper plate architectures (CBE+).
Because the spoiler finger is extended much further into the disk stack than the ramp load/unload tips, it can cause a problem during high-g non-operational shock. This is esp...