Patent ID: 8479507
Filing Date: 2013-07-09
Classification: F02G

Abstract:
1. A piston engine, comprising: a first cylinder; a first piston that moves reciprocally in the first cylinder; a second cylinder; a second piston that moves reciprocally in the second cylinder wherein the piston engine converts the reciprocating motion of the first and second pistons into rotational motion and outputs the rotational motion; a fluid passage that connects a first space formed in the first or second cylinder and filled with an actuating fluid, with a second space on an opposite side of the first or second piston to the first space; a passage opening/closing portion that is provided in the fluid passage, and the passage opening/closing portion switches between communication and non-communication through the fluid passage, wherein the passage opening/closing portion enables communication through the fluid passage upon startup of the piston engine, and shuts off communication through the fluid passage when a rotational speed of the piston engine is equal to or greater than a predetermined rotational speed; and a regenerator passage connecting the first and second cylinders including a heat exchanger configured by a heater that heats the actuating fluid, the heat exchanger being connected to the first cylinder so that the actuating fluid flows in and out of the heater, a regenerator connected to the heater so that the actuating fluid flows in and out of the regenerator, and a cooler that cools the actuating fluid, the cooler having one end connected to the regenerator and the other end connected to the second cylinder so that the actuating fluid flows in and out of the cooler.