Fluid-operated gear machine

US4400146A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wilhelm Dworak · Stuttgart, DE
• Karl-Heinz Muller · Wissen, DE
• Siegfried Mayer · Leinfelden, DE
• Wolfgang Talmon · Rain, DE
• Kurt Grabow · Feucht, DE

Key dates

• Filing date: Feb 17, 1981
• Grant date: Aug 23, 1983
• Expiry date: Feb 17, 2001

Classification

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

Abstract

A gear machine, such as a gear pump or gear motor, has a housing in a chamber of which there are journalled two gears which mesh with one another. One of the gears is mounted on a drive shaft the end of which is extended outwardly from the housing. The housing is closed at one side thereof with a cover having a stepped bore for receiving the end portion of the drive shaft. The cover is formed with a circumferential projection concentric with the drive shaft and adapted for centering the cover relative to an external element to be coupled with the gear machine. The stepped bore provided in the cover forms a chamber in which a centering ring with a certain radial play is positioned, which centering ring surrounds the drive shaft. A sealing ring is also positioned in the chamber formed in the stepped bore, which sealing ring sealingly closes the housing. The centering ring provides for reliable aligning of the gear machine to the external element adapted to be coupled with the machine.