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New Design for Fuel Efficient Piston Engines
Home » Manufacturing Impacts 
Manufacturing Advantages

The Yoke-Arm Technology innovation should easily capture the imagination of the public, similar to the hybrid auto but at a much lower price, and will even contribute to the hybrid’s effectiveness by providing a smaller, weight-reduced piston engine with the same power having a much greater fuel efficiency and lower emissions. Public readiness for beneficial changes and the awareness of environmental issues have never been greater. This new Technology incorporates an innovative linkage by adding a yoke-arm between the existing piston connecting rod and crankshaft to improve the performance of all reciprocating engines. The added piston dwell during combustion, made possible by the yoke-arm, provides considerably more efficient combustion and significantly more power. Also, the piston connecting rod alignment is now maintained in a path closer to the axis of the cylinder for much less rod angularity which significantly reduces piston and ring friction to promote added mechanical efficiencies. Further, the increased mechanical advantage of the yoke-arm vs. conventional provides even more additional power. These improvements result in considerably more power, substantial fuel economies, reduced emissions by incorporating a simple modification for the crankshaft/piston rod assembly.

So, the above benefits of increased power, substantial increases in fuel economy and reduced emissions can be accomplished with only the addition of a single component part, a yoke-arm. The illustrative diagram below shows just how the addition of a yoke-arm, with the proper mounting structure, can offer big time benefits with minimal changes to existing product lines. Current prototype development has solved the major technical issues regarding yoke-arm design and reliability. Previous perceived Yoke track-roller and bearing wear issues are non existent largely due to modern day advances in roller bearing technology. Fisher's yoke-arm does not use the "slider bearing" arrangement common today for many modern day scotch yoke designs. Fisher uses a track-roller bearing arrangement incorporating modern day materials that have not often been available until the last decade or so.

With power to weight ratios substantially increased compared to conventional engines, production costs for the yoke-arm engine for the same power should be much less. Also, with the added performance and fuel economy benefits wanted by everyone, profitability should not be a concern for an improved vehicle which everyone might be willing to pay more. Sales should not be an issue for a product people want that has superior fuel advantages, greater power for the same displacement and much lower emissions at the same or lower price. Product line implementation should be relatively easy since prototype development has now solved most of the anticipated problems normally associated with developmental longevity and reliability design issues.

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