The Consequences of Spline Friction in Multiple Disk Brake and Clutch Packs

[+] Author and Article Information
E. F. Finkin

Missile and Space Systems Division, Douglas Aircraft Co., McDonnell Douglas Corp., Santa Monica, Calif.

J. of Lubrication Tech 90(1), 65-71 (Jan 01, 1968) (7 pages) doi:10.1115/1.3601562 History: Received June 30, 1967; Online August 23, 2011


A mathematical analysis is offered showing the various consequences of spline friction in multiple disk systems. Included are equations for the load variation through a multiple disk pack, the effect of interfacial pressure distribution on this load variation, the torque variation through a pack, and the total torque carried by a pack. The relation between friction and velocity is taken into account. The coefficient of friction determined from the data of a multiple disk test apparatus, ignoring spline friction, is shown to be significantly in error and an equation is derived for calculating the true coefficients of friction. Examples of the load variation in a pack are derived and the results plotted.

Copyright © 1968 by ASME
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