One design from the late 1970’s by Kunieda and
Kunieda describes a vane and toothed gear rotary
engine with a split chamber design with the intake and
compression section axially separated from the
expansion and exhaust section. The vane design
consists of a single vane per rotor section with a varying
stator cam profile. The toothed gear design incorporates
a single receptor with multiple rotor teeth. Each design
uses multiple apex-type seals in the rotor and in the
receptor to seal between the rotor and receptor housing
and between the receptor housing and stator. Apex
seals are also incorporated in each tooth to seal
between the rotor and stator and between the rotor and
receptor