Gear type pump or motor with radial balancing

US3986800A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wilhelm Dworak · Stuttgart, DE
• Jürgen Zorn · Rossatz, AT
• Eugen Hartmann
• Martin Fader
• Karl-Heinz Muller · Wissen, DE
• Claus Jons
• Ivan Sauer
• Siegfried Mayer · Leinfelden, DE
• Jan Vlemmings

Key dates

• Filing date: Apr 9, 1975
• Grant date: Oct 19, 1976
• Expiry date: Apr 9, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C15/0026
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An external gear pump wherein the gears are installed in an eight-shaped compartment of a central housing section which is flanked by two covers. The outlet port of the housing communicates with two arcuate recesses for metallic inserts which are biased against the adjacent gears by fluid pressure in the outlet port whereby the inserts urge the gears against those portions of the internal surface of the central housing section which are located opposite the recesses. Such portions of the internal surface are formed with narrow first cutouts which communicate with the outlet port. The internal surface is further formed with relatively wide additional cutouts which are located between the first cutouts and the recesses and communicate with the inlet port. The force which is produced by fluid in the cutouts opposes the force which urges the gears against the internal surface of the central housing section to thus reduce the force with which the stubs of the gear shafts are urged against the housing.