No abstract

Of the possible alternatives to the slider-crank for internal combustion engine use, the Scotch yoke in its various forms and inversions has received considerable attention. Among these, the Stiller-Smith mechanism has shown promise as being a viable option. Kinetostatic models were formulated to determine loading within similar eight-cylinder, four-stroke, compression-ignition engines with emphasis placed on comparing the number and similarity of mechanism components, implications of component and linkage motions, the loading experienced by similar bearing surfaces, and the friction losses of specific components.

No abstract

The Stiller-Smith Mechanism employs a double cross-slider to convert linear reciprocating motion into rotational motion. It has previously been shown that a four-cylinder configuration utilizing this motion conversion device can be balanced in two dimensions. The inherent planar nature of this mechanism makes it possible to produce a compact, eight-cylinder configuration for use as an internal combustion engine which is balanced in three dimensions. This paper develops and presents the necessary requirements for such a balanced engine. Relative merits of various configurations are discussed and analytical results of different balancing schemes are presented.

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.