Abstract: An oscillatory scissor type rotary engine having two rotors wherein first and second rotor drive mechanisms are located on first and second opposite sides of the engine respectively, each rotor drive mechanisms including a carrier bowl that is rigidly fixed to an output shaft passing through the two hollow rotor drive shafts and mounted in bearings thus obviating the need for a separate drive mechanism support structure. By evenly spreading the load between all meshed gears through the provision of shock-absorbent members in the connecting rod heads, and of an increased number of symmetrically positioned planetary crank-and-pinion units on each side of the engine, and by evening out the impact loading through the use of drive components as flywheels, the resultant design is made simple, reliable, durable and dynamically balanced.

Abstract: In a small oscillatory type rotary piston engine, first and second rotors are provided, having first and second independently rotatable drive shafts. An engine output shaft is affixed to a rotatable carrier bowl member which carries a pair of rockers coupled to a pair of counterweighted rotor drive shaft arms each affixed to respective rotatable rotor drive shafts via first and second connecting rods. Each rocker has a centrally positioned, bearing mounted guide pin, positioned within an elliptical cam groove formed in a stationary baseplate made of hard alloy, for changing the relative angular positioning between the rotors during oscillatory, scissor action operation of the rotary piston engine. Shock-absorbent connecting rod elements are also provided within the connecting rods.