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S.a.i. Societa' Apparecchiature Idrauliche S.p.a.

Felice Pecorari

Volumetric machine with curved liners

Volumetric fluid machine equipped with pistons without connecting rods

A radial type of fluid-pressure apparatus, such as a pump or motor, wherein a crankshaft is supported for rotation about its axis and has a crankpin radially spaced from its axis and connected with the inner end region of a piston which extends outwardly away from the crankshaft axis and which has an outer end region extending into a chamber of an outer housing structure which surrounds the crankshaft axis. This chamber communicates with a fluid passage. An inner circular housing structure is surrounded by the outer housing structure and surrounds the crankshaft while being formed with an opening through which the piston extends, this inner housing structure having a seat at its opening which surrounds the piston. The latter seat forms part of a sphere. The piston extends slidably through a sleeve which has an outer surface also forming part of the latter sphere and seated on this seat. A spring engages the sleeve to urge the latter into engagement with the seat for maintaining a fluid-tight contact between the sleeve and the seat while at the same time the sleeve can rock with respect to the seat during transmission of motion between the piston and the crankshaft.

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Campogalliano, Italy

Felice Pecorari