Patent ID: 8443778
Filing Date: 2013-05-21
Classification: F02B

Abstract:
1. A dual crankshaft internal combustion engine, comprising: a first crankshaft and a second crankshaft in a spaced relation and having parallel rotary axes, said first crankshaft and said second crankshaft each having a spur gear for rotation about said rotary axis of said crankshaft, said spur gears of said first crankshaft and said second crankshaft having the same diameter and the same number of teeth, causing said first crankshaft and said second crankshaft to rotate at the same speed and in the same or opposite directions; at least one linkage gear disposed intermediate of said first crankshaft and said second crankshaft, said linkage gear engaged with said spur gear of said first crankshaft and said spur gear of said second crankshaft; at least one cylinder having a head at an upper end and a crank case at a lower end; at least one piston within said cylinder, said piston cyclically reciprocates within said cylinder between a top dead center position and a bottom dead center position, said first crankshaft and said second crankshaft being vertically offset from said piston; and a first connecting rod and a second connecting rod pivotally attached to a first piston rod and a second piston rod via a connecting rod pin, said first piston rod and said second piston rod connected to said piston via a piston pin, said first piston rod and said second piston rod located an equidistance between said first crankshaft and said second crankshaft; wherein said second crankshaft rotationally lags said first crankshaft; wherein said first crankshaft has a dwell angle of approximately 7.5 degrees before said top dead center position of said piston; wherein said second crankshaft has a dwell angle of approximately 7.5 degrees after said top dead center position of said piston.