Patent ID: 7574861

Claim:
An external combustion engine provided with a container in which a working medium is sealed flowable in a liquid state, the container being formed with a heater for heating part of a working medium to generate vapor of the working medium and a cooler for cooling the vapor to liquefy, the generation and liquefaction of the vapor causing the working medium to change in volume and the displacement of the liquid part of the working medium caused by the change in volume of the working medium being converted to mechanical energy for output, wherein at least the part of the container connected with the heater is branched into a plurality of tubular parts, a plurality of heaters are formed so as to be connected with the plurality of tubular parts, a plurality of vapor reservoirs for storing the vapor of the working medium are formed so as to be connected with the plurality of heaters, and the plurality of vapor reservoirs are connected with each other.