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Browse Prior Art Database

Actuator Arm - Spindle Shaft Design

IP.com Disclosure Number: IPCOM000101264D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Boyles, KA: AUTHOR [+2]

Abstract

Magnetic disk drive actuators, which include stack assemblies using hole-shaft designs wherein precision tolerances are maintained, experience assembly problems due to friction. The illustrated design includes reliefs added to the shaft and hole of the mating component to reduce assembly and disassembly friction.

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Actuator Arm - Spindle Shaft Design

       Magnetic disk drive actuators, which include stack
assemblies using hole-shaft designs wherein precision tolerances are
maintained, experience assembly problems due to friction.  The
illustrated design includes reliefs added to the shaft and hole of
the mating component to reduce assembly and disassembly friction.

      A conventional round shaft is modified by adding 3 reliefs to
the outside diameter (Fig. 1).  The relief may be flat or arcuate as
shown.  Holes in arms, spacers, or other components are designed with
reliefs at radial orientation of 60 degrees offset from the desired
position (Fig. 2). Three reliefs are shown to allow optimal
positioning accuracy and other higher order configurations are
possible. Assembly of the components onto the shaft is accomplished
by aligning the reliefs (Fig. 3), moving down the shaft to the
desired position in Z plane, and rotating the component 60 degrees
with respect to the shaft to engage the surfaces with a diameter D1
for positional accuracy (Fig. 4).  This design allows assembly of
individual or groups of components with very minimal friction.  The
design also assists with disassembly in the same manner.