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:
Hideaki Onishi
Yasushi Watanabe
Shoji Morita
Yasushi Watanabe
Shoji Morita
Application Number:
JP21424098A
Publication Date:
March 29, 2006
Filing Date:
July 29, 1998
Export Citation:
Assignee:
株式会社日立製作所
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:
Teruo Aoki