INTERNAL GEAR PUMP - AISIN SEIKI

Title:

INTERNAL GEAR PUMP

Document Type and Number:

WIPO Patent Application WO/2013/180033

Kind Code:

A1

Abstract:

This internal gear pump comprises a housing having a pump chamber. An inner rotor that rotates about a first rotational axis and an outer rotor that rotates about a second rotational axis are arranged in the pump chamber. A suction port and a discharge port are formed in the housing, and also a suction path that is in communication with the suction port and a discharge path that is in communication with the discharge port are provided. The pump chamber has an inner wall that extends in the rotating direction of the outer rotor. With a plane including the first rotational axis and the second rotational axis as a boundary, the inner wall has a suction region that is on the side of the suction port with respect to the boundary and a discharge region that is on the side of the discharge port with respect to the boundary. The suction region has a first suction region that extends in the circumferential direction toward the suction path from a pressing point, which is located at a position where the outer rotor is pressed when in operation, and a second suction region located between the first suction region and the discharge region. A groove that enlarges the gap between the outer rotor and the inner wall is provided in the first suction region. No groove is provided in the second suction region.

Inventors:

TERASHIMA HIROHITO (JP)
TOYODA FUMIHIKO (JP)

Application Number:

PCT/JP2013/064484

Publication Date:

December 05, 2013

Filing Date:

May 24, 2013

Export Citation:

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Assignee:

AISIN SEIKI (JP)

International Classes:

F04C2/10

Foreign References:

JP4792342B2	2011-10-12
US20090196772A1	2009-08-06
JPS63195391A	1988-08-12

Other References: