A rotary internal combustion engine of trochoidal type having phasing gearing between the housing and the rotor, wherein the large gear borne by the rotor and the smaller gear borne by a side wall and through which the shaft passes, are in engagement by means of teeth extending axially from their end faces. This arrangement permits the use of gears of smaller outer diameter, hence allowing more space on the rotor side face for seals, a larger and stronger shaft passing through the small gear, and stronger gear teeth.
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