Global Patent Index - EP 0994257 A1

EP 0994257 A1 2000-04-19 - External gear pump with delivery limitation

Title (en)

External gear pump with delivery limitation

Title (de)

Aussenzahnradpumpe mit Fördervolumenbegrenzung

Title (fr)

Pompe à engrenages externes avec limitation du débit

Publication

EP 0994257 A1 (DE)

Application

EP 99119067 A

Priority

DE 19847132 A

Abstract (en)

A pair of rotary driven gearwheels (6, 11) form with the sleeve faces of the housing (1) and axial sealing faces (9, 10, 16, 17) a delivery chamber having low pressure side and high pressure side. At least one pocket (22) is formed in at least one axial sealing face (9) adjoining a sealing web to connect an area of the lowest toothed engagement of the spur wheels (6, 11) with either the pump outlet (4) or the pump inlet (3). The maximum length of the toothed engagement of the spur wheels is preferably five to twenty times the depth of the pocket.

Abstract (de)

Eine Außenzahnradpumpe mit Fördervolumenbegrenzung umfasst ein Gehäuse, wenigstens ein drehangetriebenes Zahnradpaar mit zwei in Eingriff befindlichen Stirnrädern (6,11), die mit Mantelflächen des Gehäuses und axialen Dichtflächen (9,10,16,17) einen Förderraum bilden, der eine mit einem Pumpeneinlass verbundene Niederdruckseite und eine mit einem Pumpenauslass verbundene Hochdruckseite aufweist, und einen Kolben (13,14,15), der als Drehlagerung für ein Stirnrad (11) des Zahnradpaars dient und zur Begrenzung des Fördervolumens der Pumpe zusammen mit diesem Stirnrad durch Beaufschlagung mit Fluid der Hochdruckseite gegen die Kraft eines Rückstellelements (20) relativ zu dem anderen Stirnrad des Zahnradpaars verschoben wird, wobei, in wenigstens einer axialen Dichtfläche (9) an einen Dichtsteg der Dichtfläche grenzend Wenigstens eine Tasche (22) ausgebildet ist, die einen Bereich tiefsten Zahneingriffs der Stirnräder mit entweder dem Pumpenauslass oder dem Pumpeneinlass verbindet. <IMAGE>

IPC 1-7 (main, further and additional classification)

F04C 15/04; F04C 2/18

IPC 8 full level (invention and additional information)

F04C 14/20 (2006.01); F04C 2/08 (2006.01); F04C 14/00 (2006.01); F04C 14/18 (2006.01); F04C 15/00 (2006.01); F04C 15/06 (2006.01); F04C 2/18 (2006.01)

CPC (invention and additional information)

F04C 14/185 (2013.01); F04C 2/088 (2013.01); F04C 2/18 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0994257 A1 20000419; EP 0994257 B1 20020206; AT 213054 T 20020215; DE 19847132 A1 20000427; DE 19847132 C2 20010531; ES 2172279 T3 20020916; JP 2000120559 A 20000425; US 6283735 B1 20010904

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