Patent ID: 7669415

Claim:
An external combustion engine provided with: at least one main container formed into a tubular shape, a working medium being sealed in a liquid state inside said at least one main container, a plurality of evaporators formed at an upper end side of said main container, the plurality of evaporators heating and evaporating said working medium, a condenser formed below each of said plurality of evaporators, each of said condensers cooling and condensing the vapor of said working medium evaporated by the evaporators, an output part in communication with an end of said main container, said output part converting displacement of a liquid part of said working medium occurring due to fluctuations in a volume of said working medium accompanying evaporation and condensation of said working medium to mechanical energy, a single means for adjusting an internal pressure of said main container, and means for controlling said adjusting means based on a lowest temperature of a temperature of each of said plurality of evaporators.