Patent ID: 8434449

Claim:
A rotary piston device comprising: A. a housing; B. a piston chamber that is inside said housing, said piston chamber being rotationally symmetric with respect to a primary rotation axis that is stationary with respect to said housing; C. at least two rotary assemblies each individually rotationally suspended with respect to said primary rotation axis within said piston chamber, at least one of said rotary assemblies comprising: i. a rotary piston axially extending along said primary rotation axis between two opposing axial piston ends; ii. two opposing crank disks each comprising: a. an axial piston coupling that is engaging with a respective one of said two opposing axial piston ends; b. a crank joint providing a tertiary rotation axis that is fixed with respect to said rotary assembly and in a secondary offset to said primary rotation axis; c. one of a primary bearing disk and a secondary bearing disk located in between said axial piston coupling and said crank joint; D. two opposing flywheels each outside adjacent said primary and secondary bearing disks, said two opposing flywheels being rotationally suspended with respect to a secondary rotation axis in said housing, wherein said secondary rotation axis is stationary with respect to said housing and in a primary offset to said primary rotation axis, each of said two opposing flywheels comprising a radial guide; and E. two opposing driving pistons per said at least one of said rotary assemblies, each of said two opposing driving pistons joined with a respective one of said crank joints and rotationally suspended with respect to said tertiary rotation axis while being radial guided by a respective one of said radial guides; and wherein: said secondary bearing disk of one of said rotary assemblies is rotationally suspended concentrically inside said primary bearing disk of one other of said rotary assemblies.