Browse Prior Art Database

Integral Spindle Assembly

IP.com Disclosure Number: IPCOM000120468D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 58K

Publishing Venue

IBM

Related People

Reidenbach, JR: AUTHOR

Abstract

Disclosed is a precision integral bearing assembly that is intended for use in hard disk drives to bridge the gap between today's drives that use discrete ball bearings and future very high track density disk files that will likely require the precision provided by more costly air bearing spindles. Properly designed integral bearing spindles provide more rotational precision than discrete ball bearing spindles.

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Integral Spindle Assembly

      Disclosed is a precision integral bearing assembly that is
intended for use in hard disk drives to bridge the gap between
today's drives that use discrete ball bearings and future very high
track density disk files that will likely require the precision
provided by more costly air bearing spindles.  Properly designed
integral bearing spindles provide more rotational precision than
discrete ball bearing spindles.

      Shown in the figure is a pictorial illustration of the integral
bearing assembly disclosed.  A DC motor is embedded within the
spindle assembly and consists of a wound stator 1 that is fixed to a
nonrotating shaft 2 and a ring permanent magnet 3 that is attached to
the inner surface of a rotating hub 4.  The hub is provided with a
flange 5 upon which recording disks (not shown) are stacked.  The hub
may be centrally positioned as shown or it may be located along the
bottom edge of the hub.  A means for disk stack clamping is not shown
but may be accomplished by use of heat shrink rings or use of spring
rings compressed and retained by ring clips.

      The primary elements constituting the integral bearing are two
outer raceways 6 ground into the inner surface of the rotating hub,
two ball complements with retainers 7, and two inner raceway rings 8.
It is necessary for only one of the inner rings to be separate from
the shaft to provide access for motor insertion and to provide a
means to exert an axial preloa...