(57) The reversible system for the transfer of energy from a fluid to a rotating shaft
by a positive closed displacement device is characterized in that it comprises a first
stationary unit, consisting of a cylindrical chamber directly connected to the fluid
line, a second rotary unit, consisting of a cylindrical rotor having radial grooves
associated to a shaft which extends through the top and bottom of the first unit,
its axis being parallel but not coincident with the axis of the first unit, a third
unit formed by a set of rolls which loosely fit into the grooves and are as long as
the two first mentioned units, thus ensuring that the pressure of the fluid urges
the rolls against the internal surface of the chamber and that the walls of the grooves
form tight movable spaces filled with fluid, and the respective volumes being dependent
upon the angular position of the rotor in relation to the chamber, the energy of the
fluid thus being transferred to the rotating shaft or, vice versa, from the rotating
shaft to the fluid.
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