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High Energy Absorption Limit Stop for High Capacity / High Performance Disk Drive

IP.com Disclosure Number: IPCOM000014409D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Abstract

High Energy Absorption Limit Stop for High Capacity High Performance Disk Drive Described is a “Visco-Elastic Limit Stop” for high capacity high performance disk drives which optimizes the energy absorption of the visco-elastic material, and thus allows for maximum utilization of the disk surface area for storing information. Referring to Figure 1: the energy absorption capacity of the Visco-Elastic Limit Stop (5) is optimized by constraining the visco-elastic material (2) between a stiff outer ring (3) and the axial mounting pin (1). During an impact, the ring is translated relative to the axial mounting pin, thus straining all of the soft-visco-elastic material. The stiff metal ring also serves as an inertial member which further resists the motion of the striking object. For a given impact there is a given amount of energy that needs to be dissipated, and thus a given amount of “deformed mass” of visco-elastic material that needs to be deformed in order to absorb the impact energy. Without the presence of the stiff outer ring the impact energy can only be dissipated by the material in the vicinity of the point of impact this leads to a greater translation because the required “deformed mass” of visco-elastic material is deformed in series. By constraining the material between the stiff outer ring the impact energy can be dissipated by all of the material this leads to a smaller translation because the required “deformed mass” of visco-elastic material is deformed in parallel.

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  High Energy Absorption Limit Stop for High Capacity / High Performance Disk Drive

   Described is a "Visco-Elastic Limit Stop" for high capacity / high
performance disk drives which optimizes the energy absorption of the
visco-elastic material, and thus allows for maximum utilization of the disk
surface area for storing information.

Referring to Figure 1: the energy absorption capacity
of the Visco-Elastic Limit Stop (5) is optimized by
constraining the visco-elastic material (2) between
a stiff outer ring (3) and the axial mounting pin (1).
During an impact, the ring is translated relative to
the axial mounting pin, thus straining all of the
soft-visco-elastic material. The stiff metal ring
also serves as an inertial member which further
resists the motion of the striking object.

For a given impact there is a given amount of energy
that needs to be dissipated, and thus a given amount
of "deformed mass" of visco-elastic material that
needs to be deformed in order to absorb the impact
energy. Without the presence of the stiff outer ring
the impact energy can only be dissipated by the
material in the vicinity of the point of impact --
this leads to a greater translation because the
required "deformed mass" of visco-elastic material is
deformed in series. By constraining the material
between the stiff outer ring the impact energy can be
dissipated by all of the material -- this leads to a
smaller translation because the required "deformed
mass" of visco-elastic material is deformed in
parallel...