| 摘要 |
A Stirling engine where friction loss can be reduced and where a heat exchanger has no possibility of being damaged by lubrication oil for piston rings, etc. A Stirling engine has cylinders (22, 32), pistons (21, 31) reciprocating in the cylinders with gas tightness kept, through a gas bearing (48), between the pistons and the cylinders, and an approximate linear mechanism (50) directly or indirectly connected to the pistons and provided for the pistons to perform an approximate linear motion when the pistons reciprocate in the cylinders. A piston mechanism of the Stirling engine is formed to be a ring-less (without piston rings) and oil-less (without lubrication) state, so that friction loss is reduced and damage to a heat exchanger by lubrication oil is prevented. Because the pistons are caused to perform an approximate linear motion by the approximate linear mechanism, there is substantially no side force to the pistons. A combination with a gas bearing having low capability to withstand pressure by side force is effective. |
