| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal gear pump with discharge pressure stabilized by equalizing pressure distribution in a clearance. SOLUTION: This internal gear pump is provided with: a first port and a second port which are formed on surfaces opposed to two or more pump houses formed between an outer rotor and an inner rotor; a first pressure introducing groove connecting a containment part side acting as the first port and having the maximum volume out of two or more pump chambers and a radial sliding surface between a housing inner peripheral surface and an outer rotor peripheral surface; and a second pressure introducing groove connecting the containment part side of the second port and the radial sliding surface. The first and second pressure introducing grooves extend in a direction far from the containment part with a connection part between the first and second ports as a base point, and are formed to be inclined to a tangent direction more than a radial outside. COPYRIGHT: (C)2008,JPO&INPIT
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