Variable positive fluid displacement system

Details Variable positive fluid displacement system Variable positive fluid displacement system

1988-08-29

1990-03-13

Smith, Leonard E.

Pumps

Three or more cylinders arranged in parallel, radial, or...

Motor driven

417273, 417429, 417518, 91481, 91492, 91497, F04B 100

Patent

active

049079506

ABSTRACT:
A fluid pump has two pairs of rectangular oppositely-disposed pistons. The pistons of each pair travel simultaneously in opposite directions at the same speed and over the same distance. Valving is provided by a reciprocating port plate, in face-to-face relation to the piston, driven in a circular path from two spaced crankpins and which in turn drives the associated piston. The sliding movement of the port plate controls the alignment of inlet and exhaust ports in the piston and port plate. The excursion or "throw" of the pistons can be varied from zero to maximum. A crankpin throw-adjusting mechanism simultaneously adjusts the throw of each crankpin, some in one direction, some in the opposite, so that all chambers are automatically adjusted for varying, but always identical, displacements. Self-lubricated seals between the piston and chamber walls are spring loaded, by an elastomerically sealed structure having non-linear deflection-to-force characteristics.

REFERENCES:
patent: 603805 (1898-05-01), Wood
patent: 2095255 (1937-10-01), Holmes
patent: 2366186 (1945-01-01), Freeman
patent: 2544055 (1951-03-01), Staats
patent: 2712301 (1955-07-01), Gravely et al.
patent: 2725182 (1955-11-01), Spriggs
patent: 3075504 (1963-01-01), Vogel
patent: 3583286 (1971-06-01), Chiappulini et al.
patent: 4066002 (1978-01-01), Eastman
patent: 4316705 (1982-02-01), Siewart
patent: 4729720 (1988-03-01), Fujita

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