Search Results

This SAE Recommended Practice defines the principal terms and equations pertaining to automotive automatic transmission clutch plate, band, or other wet-friction systems. The terms apply directly to friction-system testing as is typically conducted on inertia-stop test equipment. Some terms can be directly applied to the analysis of friction in the transmission or brake assembly and other friction-test equipment. The glossary presents terms used to describe the set-up, testing, and results of tests as shown in Figure 1, which were taken on a clutch SAE No. 2 machine. The glossary is intended to provide a collection of definitions in the hope of eliminating confusion in development and their application to passenger cars and trucks. This document focuses on the terminology of friction-system testing. References for this type of testing are shown in Section 2.

The SAE No. 2 clutch friction test machine is used to evaluate the dynamic and static friction coefficients of automatic transmission clutch friction materials when submerged in various working fluids. It can also be used to conduct life tests on friction materials and working fluids.

This procedure intends to describe the versatility with which the SAE No. 2 friction test machine can be used and to enumerate the range of parameters that are encountered in its use. The machine is used for a variety of friction related testing in an automatic transmission wet friction environment. Principally, it is used to evaluate: