Browse Prior Art Database

Secondary Bearing Shield for Hydrocarbon Transfer Reduction

IP.com Disclosure Number: IPCOM000117402D
Original Publication Date: 1996-Feb-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cossette, LA: AUTHOR [+3]

Abstract

A method for containing bearing grease volatiles and aerosols is disclosed. The addition of secondary shields in close proximity to traditional bearing seals effectively create labyrinths/diffusion channels that contain the bearing grease components.

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Secondary Bearing Shield for Hydrocarbon Transfer Reduction

      A method for containing bearing grease volatiles and aerosols
is disclosed.  The addition of secondary shields in close proximity
to traditional bearing seals effectively create labyrinths/diffusion
channels that contain the bearing grease components.

      Secondary bearing shields, installed in close proximity to
traditional bearing seals, significantly reduce the rate of bearing
grease aerosoling and vapor loss.

      A bearing cartridge with the secondary bearing shields attached
is illustrated in the Figure.  The bearings 3 are attached to the
fixed shaft 2 and the cartridge housing 1.  The bearings 3 contain
common rubber-coated seals 4.  The secondary shields 5 are pressed
onto the shaft 2 until they contact (or are within 0.1 mm) of the
inner bearing races.  The outer diameter of the secondary shields is
selected to minimize the gap 6 to the outer bearing races, while
insuring that there is no contact during rotation.

      Because of the close proximity of the secondary shields 5 to
the bearing shields 4 (approximately 0.2 mm), the resulting diffusion
impedance is calculated to reduce bearing grease vapor loss by 3.25x.

      The secondary shields also act as a labyrinth, trapping a
portion of the grease aerosols that might otherwise escape the
bearing cartridge.