Browse Prior Art Database

Porous Ceramic Spacers for Disk File Stacks

IP.com Disclosure Number: IPCOM000121271D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Veale, FC: AUTHOR

Abstract

Disclosed is the use of porous ceramic spacers between disks in a disk file stack with a ventilated hub as a replacement for conventional non-porous spacer materials such as metal. Manufacturing and cost saving advantages result.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Porous Ceramic Spacers for Disk File Stacks

      Disclosed is the use of porous ceramic spacers between
disks in a disk file stack with a ventilated hub as a replacement for
conventional non-porous spacer materials such as metal. Manufacturing
and cost saving advantages result.

      Metal spacers required to separate disks in a disk stack are
made to fine tolerances and are drilled so as to allow air to flow
radially through them.  A tubular filter is fitted inside the spacers
and disks to ensure that air is clean before it is passed across the
disk faces.  Porous ceramics can be fabricated to fine tolerances and
will filter air down to the required particle size.  Radial airflow
is made possible through the nature of the porous material.
Advantages over current methods include:
      *    Elimination of costly machining of metal spacers
      *    Reduction in number of parts, e.g., hub filter
      *    Reduced contamination
      *    Matched thermal expansivities if ceramic disks are used

      To illustrate a typical disk stack construction, the figure
shows a section through a simplified disk stack assembly.  A motor 1
rotates a hub 2 which clamps a stack of disks 3, each of which is
equally spaced from the others by identical spacer rings 4a. One
porous spacer ring 4b is drawn separately in plan to illustrate that
there are no holes or machined air channels, which are shown in a
typical metal spacer 4c.  Mechanical...