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Research Papers: Hydrodynamic Lubrication

Three-Dimensional Thermohydrodynamic Analysis of a Wet Clutch With Consideration of Grooved Friction Surfaces

[+] Author and Article Information
J. Y. Jang

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803

Rikard Maki

Advanced Engineering, Volvo Construction Equipment, Technical Center, 63185 Eskilstuna, Sweden

1

Corresponding author.

J. Tribol 133(1), 011703 (Dec 21, 2010) (12 pages) doi:10.1115/1.4003019 History: Received June 19, 2010; Revised October 26, 2010; Published December 21, 2010; Online December 21, 2010

A model is developed to investigate the effect of radial grooves and waffle-shape grooves on the performance of a wet clutch. Three-dimensional formulation of the governing equations, boundary conditions, and numerical solution scheme are presented for modeling the thermal aspects of the engagement process in a wet clutch. The thermal model includes full consideration of the viscous heat dissipation in the fluid as well as heat transfer into the separator, the friction material, and the core disk. The convective terms in the energy equations for the oil as well as the heat conduction equations in the bounding solids are properly formulated to determine the temperature fields corresponding to the domains between grooves. Roughness, centrifugal force, deformability, and permeability of the friction material with grooves are taken into account. The effects of groove geometry such as groove depth, grooved area, and number of grooves on the engagement characteristic of a wet clutch are investigated. It is also shown that the thermal effects in a wet clutch influence the engagement time and the torque response and should be included in the analytical studies.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Analytical model of clutch

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Figure 2

Waffle-shape grooves and mesh points

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Figure 3

Variation of dimensionless parameters at 1500 rpm (ϕ=0.1 and Hg=1)

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Figure 4

Hydrodynamic pressure distributions at 1500 rpm (ϕ=0.1 and Hg=1)

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Figure 5

Effect of radial groove depth on engagement time based on THD analysis

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Figure 6

Variation of dimensionless parameters for radial grooves at 1500 rpm

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Figure 7

Temperature contour of radial grooves at 1500 rpm (ϕ=0.1 and Hg=1)

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Figure 8

Variation of dimensionless temperature for radial grooves at 1500 rpm

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Figure 9

Variation of dimensionless parameters for waffle-shape grooves at 1500 rpm

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Figure 10

Variation of dimensionless temperature for waffle-shape grooves at 1500 rpm

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