•  A hollow rotor has been adopted for weight reduction.

•  A rib has been equipped inside the rotor to heighten the rigidity.

•  The outer surfaces of the rotor include rotor recesses that serve as the combustion chambers. (Bathtub shape)

•  A rotor bearing has been installed to the interior wall of the central axial area because the wall rubs against the eccentric shaft.

•  The internal gear is engaged with the stationary gear to provide proper rotational force to the rotor.

•  The spring pin reduces the load applied to the gears when the internal and stationary gears are engaged.

•  Flank cuts are located at the corners of the rotor to delay exhaust closing timing by approx. 15 degrees, improving exhaust efficiency.