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HDD Motor Bearing for Fretting Damage

IP.com Disclosure Number: IPCOM000123184D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Related People

Kitahori, H: AUTHOR [+3]

Abstract

This article describes a method for preventing the bearing damage with fretting. To prevent the bearing damage with fretting which was occurred between ball and raceway, Oil was coated both ball and raceway in advance. After that, the bearing is assembled normally. In general ball bearing, fretting damage is occurred under following conditions. 1. The bearing doesn't rotate. 2. Some vibration stress is applied the bearing.

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HDD Motor Bearing for Fretting Damage

   This article describes a method for preventing the bearing
damage with fretting.  To prevent the bearing damage with fretting
which was occurred between ball and raceway, Oil was coated both
ball and raceway in advance.  After that, the bearing is assembled
normally.  In general ball bearing, fretting damage is occurred
under following conditions.
  1.  The bearing doesn't rotate.
  2.  Some vibration stress is applied the bearing.

   During the bearing rotating, the grease which was inserted
into bearing works as lubricating oil.  But when the bearing doesn't
rotate, it doesn't work as lubricating oil.  At this time (bearing
isn't turning), some vibrations stress is applied the bearing,
fretting damage is occurred.  The oil which was coated ball and
raceway works lubricating oil when the bearing doesn't rotate.  This
kind of bearing can prevent the fretting damage.
  Outline
   Fig. 1    HDD Device.
             In the HDD Device with load/unload function,
              Heads are out of disk when its power off.  During
              the transportation, bearing is vibrated by some
              vibration stress.  Sometimes this cause of fretting
              damage.
   Fig. 2    Section of HDD.
             Usually two bearing are used.
   Fig. 3    Section of bearing
             Ball and raceway contact at the "C...