Reciprocating hydraulic pump

Details Reciprocating hydraulic pump Reciprocating hydraulic pump

1991-07-08

1992-11-24

Bertsch, Richard A.

Pumps

Expansible chamber type

Pumping member position controlled port

417554, 417490, F04B 704

Patent

active

051658755

ABSTRACT:
The hydraulic pump comprises at least one reciprocating piston (2) sliding in a stationary cylinder (4). The piston (2) comprises, on the same side as the working chamber (10), a cylindrical skirt (22) which has the inside diameter of the cylinder (4) and in which is made at least one first port (18) putting the working chamber (10) in communication with the outer wall of the skirt (22). A second port (24) puts the duct (6) upstream of the valve (12) in communication with the outer wall of the piston (2). Finally, a slot (20) of a length at least equal to the distance separating the ports (18, 24) is made in the cylinder (4) so as to cause these ports (18, 24) to communicate over a specific zone of the reciprocating movement of the piston when the piston is sensibly at mid-stroke.

REFERENCES:
patent: 2404502 (1946-07-01), Kehle
patent: 2612837 (1952-10-01), Midgette
patent: 4484866 (1984-11-01), Runkle

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