Browse Prior Art Database

Nitrogen and UV Pass-Thru Preloader

IP.com Disclosure Number: IPCOM000111854D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Sompop, A: AUTHOR [+2]

Abstract

Disclosed here is an invention of a preloader designed for letting nitrogen and UV light pass in to stimulate the hardening reaction of adhesive bond in a spindle motor shaft-bearing assembly process. Besides, the hub shaft is proposed to be redesigned to make the best use of the preloader.

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Nitrogen and UV Pass-Thru Preloader

      Disclosed here is an invention of a preloader designed for
letting nitrogen and UV light pass in to stimulate the hardening
reaction of adhesive bond in a spindle motor shaft-bearing assembly
process.  Besides, the hub shaft is proposed to be redesigned to make
the best use of the preloader.

      The UV adhesive used in the spindle motor assembly process
contains a radical reaction base which, after filling up a narrow gap
like the gap between the bearing and shaft, will be activated by
metallic ion on the surface of the metal and then start the hardening
reaction.  But it has been found that, in the normal atmosphere, the
oxygen hinders the radical base from doing its adhesion reaction.  By
keeping the adhesive hardened in a nitrogenous environment, aimed for
shutting out the oxygen, the hardening reaction can proceed more
quickly and completely.

      To respond more effectively to the adhesion technology using
nitrogen as a stimulant, a new preloader was made.  The
characteristics and the advantages of this preloader are as follows:

1.  Nitrogen Pass-in:  The preloader was designed to have a hole at
    the tip of the preloader pin through which nitrogen gas will pass
    in and become saturated in a small room in the middle of the pin
    above the shaft.  Accordingly, the nitrogen around the adhesive
    will be condensed enough to stimulate the adhesive effectively.

2.  Nitrogen Pass-out:  T...