Patent ID: 8640453

Claim:
A heat engine comprising: a high-temperature space portion and a low-temperature space portion, each of which has a working gas with a different temperature range from each other; a regenerator provided between the high-temperature space portion and the low-temperature space portion; a first piston including a cylinder portion integrally formed inside the first piston, the first piston configured to cause volumetric changes of the working gases in each of the high-temperature space portion and the low-temperature space portion and transmit motive energy on receipt of pressure changes of the working gases; and a second piston and a third piston provided in the low-temperature space portion and the high-temperature space portion, respectively, the second piston and the third piston configured to transfer the working gases between the high-temperature space portion and the low-temperature space portion and move with a 180° phase difference from each other with respect to the regenerator, wherein the second piston is slidably housed in the cylinder portion of the first piston, the first piston, and the second piston and the third piston are configured to move with a phase difference smaller than 180°, heat and motive energy are exchanged by using the volumetric changes in the high-temperature space portion and the low-temperature space portion located respectively on both sides of the regenerator, as well as by using the transfer of the working gases, and the second piston and the third piston are connected to each other with a connecting rod.