Internal-gear pump and hydraulic circuit for a motor vehicle drivetrain

US10119539B2 · kind B2 · utility

Assignee

• GETRAG Getriebe- und Zahnradfabrik Hermann Hagen · DE

Inventors

• Mark Schweiher · Kaufbeuren, DE
• Thomas Hoffmeister · Ditzingen, DE
• Sven Schuster · Walheim, DE
• Holger Berg · Heilbronn, DE

Key dates

• Filing date: Sep 12, 2014
• Grant date: Nov 6, 2018
• Expiry date: Sep 29, 2036

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C2/086
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An internal-gear pump has a housing which has a first fluid port and a second fluid port. An inner rotor is mounted in the housing so as to be rotatable about an inner rotor axis and has an external toothing. An outer rotor is rotatable in the housing about an outer rotor axis and has an internal toothing which, to generate a pump action, engages with the external toothing of the inner rotor. The internal-gear pump furthermore has a ring element which is mounted movably in the housing so as to be pivotable between a first position and a second position. At least a third fluid port is formed on the housing. The third fluid port is arranged relative to the ring element such that, in the first position of the ring element, the third fluid port is connected to the second fluid port. In the second position, said third fluid port is separated from the second fluid port.