Patent ID: 9371798
Filing Date: 2016-06-21
CPC Classification: F01B,F02G

Claim Text:
1. A free-piston stirling engine comprising: a case charged with a working gas; a power piston which partitions an inside of the case into a first space and a second space; a displacer arranged in the first space; a communication hole provided in the power piston, which communicates the first space with the second space along a predetermined axis; a displacer rod, which has a proximate end proximate to the displacer and a distal end distal from the displacer, and extends from the displacer into the second space along the predetermined axis through the communication hole; a first elastic supporting member, which is arranged in the first space, and configured to elastically support the displacer or the displacer rod at the proximal end, in the case; and a second elastic supporting member, which is arranged in the second space, and configured to elastically support the displacer rod at the distal end, in the case, wherein the communication hole permits movement of the displacer rod with the first space and the second space maintained in an airtight state, the power piston and the displacer reciprocate along the predetermined axis with a predetermined phase difference therebetween, by the working gas in the first space being expanded and compressed by cooling and heating, bias forces of the first elastic supporting member and the second elastic supporting member restrict tilting of the displacer and the displacer rod with respect to the predetermined axis, and the first elastic supporting member is a coil spring.