| 摘要 |
PROBLEM TO BE SOLVED: To improve thermal efficiency, reliability and a service life by preventing decrease in sealing effect between a cylinder and a piston caused by abrasion of a piston ring in a stirling refrigerator machine. SOLUTION: A clearance in a sliding part between a compressing cylinder 17 and an expansion cylinder 18 and a compressing piston 19 and an expansion piston 25 is sealed with a piston ring assembly 59 consisting of a combination of a piston ring 55, a back up ring 57 and a tension ring 58 or a combination of the piston ring 55 and the tension ring 58. COPYRIGHT: (C)2004,JPO
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