Dwelling scotch yoke engine

The engine of claim I wherein said yoke cam member includes a wall part connecting said side walls.

The engine of claim I wherein said yoke includes coaxial rods extending in opposite directions from said yoke cam member, each piston connected by a saddle to one end of said rod, each rod secured by a wrist pin to a said saddle in abutting contact with said saddle.

The engine of claim I wherein each cylinder includes a bore defined by opposing end walls and a connecting side wall, said piston located within each cylinder bore, said yoke including a rod extending in a sealed relationship through one of said bore end walls.

An engine comprising a housing which includes a central crank case having a chamber therein and two pairs of oppositely located parallel cylinders, one of said cylinders of each pair located on each side of said crank case with said crank case chamber therebetween, a piston shiftably supported in each cylinder forming aligned pistons for each pair of cylinders, a yoke connected between said aligned pistons and extending through said crank case chamber, each yoke being shiftable between first and second reciprocal positions with said crank case chamber upon alternating movement of said aligned pistons within their respective cylinders, a flywheel journalled within said crank case chamber, means carried by said flywheel accessible from a crank case opening for imparting driving power through a power input mechanism during flywheel rotation, each said yoke including a cam member located generally centrally between said aligned pistons, said flywheel including means engaging said yoke cam member of each yoke for imparting rotation to the flywheel upon movement of each yoke between its said first and second positions, each yoke cam member of a said yoke including camming means contacting said flywheel means for imparting controlled movement to each said piston connected to said yoke prior to the commencement of the power stroke of the piston.