How grease keeps bearings running

Document Type

Article

Publication Date

10-7-2010

Abstract

The National Lubricating Grease Institute (NLGI) has classified greases into grades so that the right grease can be specified for longer bearing life. Fine clay particles or nonmelting organic powders like polyurea can replace soaps for a grease with no melting point for high temperature use. Lower-viscosity greases work better with central lubrication systems while higher-viscosity greases are good to form lubricating films and reduce the bearings' contact with asperities, microscopic peaks on the shaft surface. While engineers can choose oils and thickeners based on test and performance ratings, field experience is the best guide to meet load, speed, power loss, and temperature requirements of greases. An engineer can initially set the lubrication system to deliver 25 to 50% more grease in a bid to confirm that grease-feed rates are appropriate.

Publication Source (Journal or Book title)

Machine Design

First Page

54

Last Page

59

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