Stiller—Smith versus Conventional V-8 Bearing Load and Friction Comparisons

Abstract

The Scotch yoke in its various forms and inversions has received considerable attention as a possible alternative to the slider-crank for internal combustion engine use. As a recent entry, the Stiller-Smith mechanism has shown promise as being a viable and strong option. Kinetostatic models were formulated to determine loading within similar eight-cylinder, four-stroke, compression-ignition engines. Emphasis was placed on comparing the number and similarity of mechanism components, implications of component and linkage motions, and the severity of loading experienced by similar bearing surfaces within the engines. It was found that journal bearings in the slider-crank engine were more severely loaded than those in the Stiller-Smith engine. The linear reciprocating bearings in the Stiller-Smith engine were more heavily loaded than the slider-crank piston skirts. Implications of these and other results are discussed.