Importance

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Abstract

A rotor-type pump comprises a housing having a trochoidal curved surface and an intake port and a discharge port. A drive shaft is mounted rotatably about a first axis in the housing. A rotor having a second axis eccentric to the first axis is rotatably mounted to the drive shaft. The rotor cooperates with the trochoidal curved surface. A plurality of working-fluid chambers are defined by the trochoidal curved surface and an outer peripheral surface of the rotor and variable in volume as the rotor rotates. The intake port is open into one chamber of the chambers and the discharge port is open into another chamber thereof. A communication passage fluidly interconnects at least adjacent two of the chambers. A rotor control mechanism is provided for controlling the rotor to move along the trochoidal curved surface with a predetermined clearance therebetween upon rotation of the rotor.

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First Claim