Scotch yoke engine with variable stroke and compression ratio

An internal combustion yoke type engine including,

• a case having multiple cylinders,
• a yoke having end mounted pistons and defining a centrally located raceway,
• a slider confined within said raceway and having an oval path with straight segments and curved end segments,
• an engine crankshaft including a variable length throw assembly, said slider imparting rotary motion to the throw assembly, and
• drive means including,
• a crank component having a crank boss and a crankpin, said crankpin controlling the oval path of the slider,
• a control shaft within one end of which said crank boss is journaled in a radially offset manner,
• power transmission means driven by the engine crankshaft and imparting rotation to said control shaft for rotation of said control shaft opposite to the direction of said crankshaft wherein said crank boss is carried by said control shaft to orbit in a direction opposite to the path of the crankpin controlled slider to provide the oval crankpin and slider path,
• the power strokes of said pistons being simultaneous with slider travel along the curved end segments of said path.

An internal combustion yoke type engine including,

• a case having multiple cylinders,
• a yoke having end mounted pistons and defining a centrally located raceway,
• a slider confined within said raceway and having an oval path with straight segments and curved end segments,
• an engine crankshaft including a variable length throw assembly, said slider imparting rotary motion to the throw assembly and
• drive means including a control shaft, a positionable crank component including a crank boss journaled in a radially offset manner within said control shaft, said crank component further including a crankpin coupled to said slider, power transmission means imparting rotation to said control shaft opposite to engine crankshaft rotation, a compression control mechanism for momentarily accelerating and retarding said control shaft into a new phase relationship with the engine crankshaft to reposition the crank component and particularly the crankpin thereof to cause the slider to change its orbital path resulting in stroke and compression ratio changes, said compression control mechanism further including a signal receiving actuator responsive to an engine monitoring device.