Abstract: A planetary rotor apparatus features a plurality of endbells, a plurality of rotor shafts, a plurality of rotors each driven by a respective rotor shaft of the plurality of rotor shafts, a plurality of crank arms, a crank link, and a plurality of gear shafts. A plurality of ball bearing assemblies facilitate rotation of the plurality of rotor shafts and the plurality of gear shafts within a respective endbell. Each rotor may comprise a helical formfactor, each rotor meshing with the others. In some examples, the planetary rotor apparatus has three rotor shafts, three rotors, and three first crank arms coupled to three second crank arms via the crank link. In some examples, the planetary rotor apparatus has four rotor shafts, four rotors, and four first crank arms coupled to four second crank arms via the crank link.

Abstract: A planetary rotor apparatus features a plurality of endbells, a plurality of rotor shafts, a plurality of rotors each driven by a respective rotor shaft of the plurality of rotor shafts, a plurality of crank arms, a crank link, and a plurality of gear shafts. A plurality of ball bearing assemblies facilitate rotation of the plurality of rotor shafts and the plurality of gear shafts within a respective endbell. Each rotor may comprise a helical formfactor, each rotor meshing with the others. In some examples, the planetary rotor apparatus has three rotor shafts, three rotors, and three first crank arms coupled to three second crank arms via the crank link. In some examples, the planetary rotor apparatus has four rotor shafts, four rotors, and four first crank arms coupled to four second crank arms via the crank link.