| 摘要 |
A piston of an axial piston cylinder group A of an expander is driven by a cam surface with a height that changes in a direction of an axis L of a rotor formed on a cam member fixed to a casing to surround the axis L. A roller rotatably provided at a tip end of the piston abuts against the cam surface. Therefore, timing and length of each intake stroke, expansion stroke and exhaust stroke are optionally set, and the piston is driven in an optional timing and at an optional speed, to enhance the efficiency of the expander. The roller rolls on the cam surface to minimize transmission, from the cam surface to the piston, of the reaction force which does not contribute to torque of the rotor, and to prevent the sliding surfaces of the piston and the cylinder sleeve from twisting to enhance durability.
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