US Patent 9316249 XY separate crank mechanism and driving device provided therewith

An XY separate crank mechanism provided between a movable body reciprocating in a first direction and a rotatable crankshaft to mutually convert reciprocating motion of the movable body and rotational motion of the crankshaft, includes a support member provided freely reciprocatingly in the first direction, a crank connecting member mounted on the support member freely reciprocatingly in a second direction perpendicular to the first direction and with which a crank of the crankshaft is rotatably engaged, and a connecting member configured to connect the piston and the support member and reciprocate in the first direction together with the piston and the support member.