Effects of Groove Orientation on Hydrodynamic Behavior of Wet Clutch Coolant Films

[+] Author and Article Information
M. Mahbubur Razzaque, Takahisa Kato

Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113, Japan

J. Tribol 121(1), 56-61 (Jan 01, 1999) (6 pages) doi:10.1115/1.2833811 History: Received April 08, 1997; Revised February 18, 1998; Online January 24, 2008


A steady-state Reynolds type equation with inertia consideration is solved numerically for a coolant film entrapped between a grooved separator-friction plate pair of a multidisk wet clutch arrangement at a particular instant of the disengaged state. Straight grooves with rounded, trapezoidal, and V-section at different angular orientations are considered and the effects of their geometry and orientation on viscous torque, flow rate, and axial force are presented. Among the profiles studied, the rounded one is found to be better. Grooves inclined with the flow direction cause less viscous torque and, hence, less power loss. The choice of orientation angle, β, to give a maximum outflow or inflow may be helpful for cooling by better convection. For wider radial span and large number of grooves, the minimum operating gap ratio is suggested to be around 2.0. Inertia effects may shift the optimum orientation angle by as much as 10 deg, even at a moderate value of gap Reynolds number.

Copyright © 1999 by The American Society of Mechanical Engineers
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