The wear behavior of grease lubricated gears is significantly affected by a number of factors besides the composition of the grease that is used for lubrication. A main influence factor on the wear behavior of grease lubricated gears is the lubrication supply mechanism (“circulating” or “channeling”), which is, among other things, strongly affected by the rotational speed of the gears. Especially at higher rotational speed, the dominant grease lubrication supply mechanism for grease lubricated gears tends to be channeling, which generally promotes increased wear on account of limited lubricant availability in the mesh as well as limited heat dissipation from the mesh. Experimental investigations conducted herein have shown that the gear wear behavior, especially at higher rotational speed, can be influenced by the internal geometry of the gear casing as well as by the direction of rotation of the gears. Additional investigations that were conducted focus on the effect of the material pairing and heat treatment on the wear behavior of grease lubricated gears in comparison to a case-carburized reference gear set. Furthermore, the effect of the gear size on the lubrication supply mechanism and thus on the wear behavior was investigated. For both gear sizes investigated (mn = 1.0 mm and mn = 0.6 mm), circulating was observed at low rotational speeds. At high rotational speeds, channeling effects were dominant.
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November 2017
Research-Article
The Effect of Selected Operating Parameters, Material Pairing, and Gear Size on the Wear Behavior of Grease Lubricated, Small Module Gears
Hansjörg Schultheiss,
Hansjörg Schultheiss
Department of Mechanical Engineering,
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: hansjoerg.schultheiss@mytum.de
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: hansjoerg.schultheiss@mytum.de
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Thomas Tobie,
Thomas Tobie
Department of Mechanical Engineering,
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: tobie@fzg.tum.de
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: tobie@fzg.tum.de
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Karsten Stahl
Karsten Stahl
Department of Mechanical Engineering,
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: fzg@fzg.tum.de
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: fzg@fzg.tum.de
Search for other works by this author on:
Hansjörg Schultheiss
Department of Mechanical Engineering,
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: hansjoerg.schultheiss@mytum.de
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: hansjoerg.schultheiss@mytum.de
Thomas Tobie
Department of Mechanical Engineering,
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: tobie@fzg.tum.de
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: tobie@fzg.tum.de
Karsten Stahl
Department of Mechanical Engineering,
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: fzg@fzg.tum.de
Gear Research Center (FZG),
Technical University of Munich (TUM),
Boltzmannstr. 15,
Garching D-85748, Germany
e-mail: fzg@fzg.tum.de
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 6, 2017; final manuscript received April 6, 2017; published online July 10, 2017. Assoc. Editor: Xiaolan Ai.
J. Tribol. Nov 2017, 139(6): 061105 (9 pages)
Published Online: July 10, 2017
Article history
Received:
January 6, 2017
Revised:
April 6, 2017
Citation
Schultheiss, H., Tobie, T., and Stahl, K. (July 10, 2017). "The Effect of Selected Operating Parameters, Material Pairing, and Gear Size on the Wear Behavior of Grease Lubricated, Small Module Gears." ASME. J. Tribol. November 2017; 139(6): 061105. https://doi.org/10.1115/1.4036493
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