IMPROVED SCOTCH YOKE ENGINE OR PUMP

摘要

An improved scotch yoke engine of pump including a piston joined to a yoke structure wherein the piston (1) is free to move along at least one axis defined by a flying cross (60) relative to the yoke structure (7) during piston reciprocation, the piston and yoke structure being joined in a flat type joint arrangement and the piston prevented from rotation around the piston axis by engagement of the piston and the yoke with the flying cross, the flying cross being not locked in position between the piston base (50) and the yoke shank end arrangement (700).