| 摘要 |
An expander is provided in which a rotor ( 22 ) is rotated by supplying high-temperature, high-pressure steam to an expansion chamber ( 43 ) defined between a piston ( 42 ) and a cylinder sleeve ( 41 ) so that the piston ( 42 ) pushes a swash plate ( 31 ), and sliding surfaces of the piston ( 42 ) and the cylinder sleeve ( 41 ) are lubricated with oil supplied via an oil hole ( 32 c). The piston ( 42 ) includes a top part ( 63 ) that is exposed to high-temperature, high-pressure steam within the expansion chamber ( 43 ), an end part ( 61 ) that abuts against the swash plate ( 31 ), and a middle part ( 62 ) that is present between the end part ( 61 ) and the top part ( 63 ) and is in sliding contact with the cylinder sleeve ( 41 ), the top part ( 63 ) being formed from a heat-resistant and corrosion-resistant material, the end part ( 61 ) being formed from a material having high surface pressure resistance, and the middle part ( 62 ) being formed from a material having high abrasion resistance. This enables the durability of the piston ( 42 ) of an axial piston cylinder type expander to be improved.
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