Research on a Mini-Disc Machine for Gear Testing.

Nicolson, David M.; Sayles, R.S.

doi:10.21236/ada195788

Cited by 2 publications

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“…Because of this variability, numerous tests must be run to establish test result confidence. A number of previous workers have attempted to develop more cost-effective laboratory-scale (18)- (20) or alternate full-scale gear test procedures (21), (22). The laboratory procedures often produce conditions of combined sliding and rolling, such as a twindisc geometry, to measure both boundary and elastohydrodynamic performance simultaneously (2).…”

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Development of a Gear Oil Scuff Test (GOST) Procedure to Predict Adhesive Wear Resistance of Turbine Engine Lubricants

Lacey

1998

Tribology Transactions

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The Ryder gear test has been widely used to define the antiwear characteristics of lubricating oils intended for w e i n aviation gear boxes. However, a n accelerated procedure is required, particularly for the screening and development of new lubricants, due to the cost and compkxity of the Ryder test. The present study is a development of previous work that evaluated the suitability of a number of apparat w . Initial screening work indicated that a ball-on-rotating ~ylinder contact geomet? had the potential to effectively predict the results of the Ryder gear test. The present work desmibes the development ofthe test procedure and confirms that similar wear mechanism exist i n both instances. Indeed, the calculated contact jlesh temperature i n both the Ryder and ball-on-cylinder contacts was almost identical at the onset of scu.ng. A simpb model was developed to predict the effects of lubricant viscosity on the gear contact. Excellent correlation was observed between the model and the measured effects of hydrc~ dynamic lubrication i n the full-scab Ryder gear test. As a result, the Gear Oil Scuff Test (GOST) procedure considers both chemical and physical lubricant characteristics. A correlation coeficient of 0.92 was obtained between the laboratmy and full-scab test procedures for a matrix of 27 oils of widely v a~i n g quality.

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