Browse Prior Art Database

Labyrinth Seal for Pivot of a Spindle Motor

IP.com Disclosure Number: IPCOM000116027D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Nakamoto, T: AUTHOR [+4]

Abstract

Disclosed is a design to minimize the amount of grease leak in a Hard Disk Drive. For high reliability, it is very important to keep the atmosphere inside the disk enclosure very clean. But, lubricant grease which is used in the bearings of spindle motors often leaks due to rotation. Spindle motors have ferro-fluid seals or labyrinth seals to prevent this.

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Labyrinth Seal for Pivot of a Spindle Motor

      Disclosed is a design to minimize the amount of grease leak in
a Hard Disk Drive.  For high reliability, it is very important to
keep the atmosphere inside the disk enclosure very clean.  But,
lubricant grease which is used in the bearings of spindle motors
often leaks due to rotation.  Spindle motors have ferro-fluid seals
or labyrinth seals to prevent this.

      Recently, actuators seeking speed is becoming very fast due to
performance requirements.  Grease also leaks from pivots.  The
disclosed idea involves a pivot bearing where a labyrinth seal is
created.  Fig. 1 shows this with a labyrinth cap attached.  Fig. 2
shows this where the base of the Hard Disk Drive and the pivot
together
form a labyrinth to prevent grease from leaking.