Patent ID: 6968688

Claim:
A two-cycle hot-gas engine comprising: an expansion piston ( 2 ; 104 ) in an expansion cylinder member ( 3 ; 102 ) and a compression piston ( 4 ; 103 ) in a compression cylinder member ( 5 ; 101 ), the expansion piston ( 2 ; 101 ) and the compression piston ( 4 ; 103 ) being disposed along a common axis ( 6 ); first gas chambers (GH 1 and GK 1 , respectively) formed at a bottom end ( 15 ) of the compression piston ( 4 ) in the compression cylinder member ( 5 ) and at a bottom end ( 16 ) of the expansion piston ( 2 ) in the expansion cylinder member ( 3 ), respectively; the first gas chambers communicating with each other through a first heater ( 18 ), a first regenerator ( 19 ) and a first cooler ( 20 ); second gas chambers (GH 2 and GK 2 , respectively) formed at a top end ( 21 ) of the compression piston ( 4 ) in the compression cylinder member ( 5 ) and at a top end ( 22 ) of the expansion piston ( 2 ) in the expansion cylinder member ( 3 ), respectively; and the second gas chambers communicating with each other through a second heater ( 24 ), a second regenerator ( 25 ), and a second cooler ( 26 ).