Patent ID: 8479506
Filing Date: 2013-07-09
Classification: F02G,Y10T

Abstract:
1. A piston engine, comprising: a cylinder; a piston that moves reciprocally in the cylinder wherein the piston engine converts reciprocating motion of the piston into rotational motion and outputs the rotational motion; a gas bearing that is interposed between the cylinder and the piston; a fluid passage that connects a first space with a second space on an opposite side of the piston to the first space, the first space is an accumulated fluid space formed in the cylinder and the accumulated fluid space is filled with an actuating fluid, the second space is a space in which a motion conversion member that converts reciprocating motion of the piston into rotational motion is disposed; a passage opening/closing valve provided in the fluid passage; and a passage opening/closing portion that opens and closes the fluid passage by controlling the passage opening/closing valve; wherein, upon stopping of the piston engine, the passage opening/closing portion enables communication through the fluid passage when the piston engine is running in a region at which the piston floats in the cylinder, the region being determined based on the pressure of the actuating fluid in the first space and the engine rotational speed of the piston engine.