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Ester Oil Rust Preventative for Ball Bearings

IP.com Disclosure Number: IPCOM000123410D
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 30K

Publishing Venue

IBM

Related People

Prater, W: AUTHOR [+2]

Abstract

Disclosed are new formulations of rust preventative oils for use on the disk drive's actuator pivot bearing and the spindle motor bearing. They are composed of the identical ester oils used in the bearing greases and the same antioxidant compounds that are used in the greases.

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Ester Oil Rust Preventative for Ball Bearings

   Disclosed are new formulations of rust preventative oils
for use on the disk drive's actuator pivot bearing and the spindle
motor bearing.  They are composed of the identical ester oils used in
the bearing greases and the same antioxidant compounds that are used
in the greases.

   These formulations would be direct substitutes for the
hydrocarbon oils or different ester oils that are commonly used to
coat the bearings to prevent rust during ball bearing manufacturing.
Because these rust preventative oils would be perfectly compatible
with the bearing greases, there would be no risk of contamination
from incompatible oils or rust preventatives.  Volatiles from prior
art rust preventatives oils escaping into the disk drive can be a
source of contamination that contributes to head stiction.  Also,
grease contaminated with foreign oils can adversely effect disk drive
servo performance and bearing life.

   To be compatible with the currently used grease the
actuator pivot bearing would be coated with triesters of trimellitic
acid containing the antioxidant dioctyl diphenyl amine.  To be
compatible with the currently used grease the spindle motor bearing
would be coated with a mixture of dioctyl sebacate and tetraesters of
pentaerythritol oils containing the antioxidant N, N'-di-sec-butyl
methylene dianiline.