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Research Papers: Applications

The Effect of Selected Operating Parameters, Material Pairing, and Gear Size on the Wear Behavior of Grease Lubricated, Small Module Gears

[+] Author and Article Information
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

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

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

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 139(6), 061105 (Jul 10, 2017) (9 pages) Paper No: TRIB-17-1009; doi: 10.1115/1.4036493 History: Received January 06, 2017; Revised April 06, 2017

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.

FIGURES IN THIS ARTICLE
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Copyright © 2017 by ASME
Topics: Wear , Gears
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References

Figures

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Fig. 1

Lubrication supply mechanism “circulating/churning” [16,17]

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Fig. 2

Lubrication supply mechanism channeling [16,17]

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Fig. 3

FZG small module gear test rig (schematic)

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Fig. 4

Case-carburized pinion type FL1 with low wear (exemplary)

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Fig. 5

Case-carburized pinion type FL1 with medium wear (exemplary)

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Fig. 6

Case-carburized pinion type FL1 with high wear (exemplary)

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Fig. 7

Case-carburized pinion type FL1 with wear and scuffing similar signs (exemplary)

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Fig. 8

Grease fill-levels and casing geometry

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Fig. 9

Test results for phase I (absolute wear values)

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Fig. 10

Definition of the direction of rotation of the test gears

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Fig. 11

Test results for phase II (absolute wear values)

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Fig. 12

Test results for gear type FL1 at different rotational speeds (specific wear values)

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Fig. 13

Test results for gear type FL06 at different rotational speeds (specific wear values)

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Fig. 14

Plewe-Diagram for test results with gear types FL1 and FL06

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