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Title:
COMBINED GEAR PUMP
Document Type and Number:
Japanese Patent JP3760298
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a combined gear pump with a first gear pump and a second gear pump, in which hydraulic oils of different properties can be treated, and can prevent free fall of the hydraulic oil of the first gear pump that results in mixing with the hydraulic oil of the second gear pump.
SOLUTION: A first internal gear pump 1 is constituted by accommodating a ring-shaped first gear member 7 and a second gear member 9 in a recess 4 of a pump housing 3. A second gear pump 2 is constituted by the first gear member 7 and a third gear member 11 which is provided with external teeth 10 to be engaged with external teeth 6 of the first gear member 7. A first intake port 14 and a first discharge port 15 for the first gear pump 1 are opened, and a second intake port 16 and a second discharge port 17 for the second gear pump 2 are opened, in the recess 4 of pump housing 3. The first gear pump 1 is disposed lower than the second gear pump 2 with respect to the gravity.


Inventors:
Onishi, Hideaki
Watanabe, Yasushi
Morita, Shoji
Application Number:
JP1998000214240
Publication Date:
March 29, 2006
Filing Date:
July 29, 1998
Export Citation:
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Assignee:
UNISIA JECS CORP
International Classes:
F04C2/10; F04C2/18; F04C11/00; (IPC1-7): F04C2/18; F04C2/10; F04C11/00
Domestic Patent References:
JP50114705U
Foreign References:
GB1234889B
Attorney, Agent or Firm:
青木 輝夫