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The application of the Stiller-Smith Mechanism for use in an internal-combustion engine is investigated. The dimensionless stroke-to-bore and stroke-to-gear diameter ratios are used as a design vector. The effect of changes in the design vector upon parameters including mechanical efficiency, internal gear loads, bearing reaction forces, and connecting rod loads is investigated. A composite objective function is defined in which these parameters have variable weighting. An optimal design can be reached by using this function. Characteristics of the mechanism with and without the effect of inertial forces are investigated. Results are presented including three-dimensional sensitivity plots and an optimal design.

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.