| 摘要 |
A piston engine in the form of a piston pump or a piston engine (motor) comprises two or more piston cylinders (14b, 14c), preferably positioned wit h the same angular distances of 180 degrees for two cylinders, 120 degrees for three cylinders etc. with regards to an axis, and each comprising a reciprocating piston with a projecting piston rod (18b, 18c). Via the piston rods (18b, 18c), each piston is given a controlled displacement matched to t he controlled, given displacement of another or other pistons. The control mean s is rotatable and influences the projecting outer end portions of the piston rods or parts fitted to these, for instance rotatable rollers (20b, 20c). By a piston pump of this type, the piston are to contribute to impelling a fluid flow, while a piston engine of this type shall be designed to be driven by a fluid flow. Operating conditions are aimed at which give a more even volume flow, i.e. without any significant fluctuations. For this purpose, said rotatable control means is designed with an encircling cam surface (52) whic h the piston rod ends abut via the peripheral surface of said rotatable roller s (20b, 20c). According to a feature of a method associated with the applicati on of such a piston engine, each piston may with advantage be driven at a constant speed through part of its power stroke.
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