| 摘要 |
A free-piston type Stirling engine used for producing cold heat with the vibration center position of a piston accurately kept. A first space is formed on one side of a piston, and a second space is formed on the opposite side to spread up to a portion adjacent to a cylinder's side wall. A piston is provided with a vibration-direction first groove extending up to the first space and a circumferential-direction second groove, and a cylinder is provided with a hole penetrating the side wall thereof The second groove of the piston, when coupled with the cylinder's hole during a piston vibration process, allows the first space to communicate with the second space. Accordingly, a short-time communication between the first and second spaces will balance pressures in the two spaces against each other to keep the vibration center position of the piston accurately. |
