Gear oil pump with internal rotor, comprising extensions of reniform suction and pressure elements

US6089842A · kind A · utility

Assignee

• Schwabische Huttenwerke GmbH · DE

Inventors

• Harald Dehmel · Bad Schussenried, DE
• Robert Laux · Neuwied, DE
• Bernd Schreiber · Heroldsbach, DE
• Gunther Stutzle · Bad Schussenried, DE

Key dates

• Filing date: Apr 2, 1999
• Grant date: Jul 18, 2000
• Expiry date: Apr 2, 2019

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C2/102
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A gear pump with internal rotors for pumping fluids includes one or more internal gear rotors, a cover, at least one infeed reniform suction chamber in a pump housing, at least one discharge reniform pressure chamber in the pump housing, and a reniform pressure chamber extension. Each gear rotor has teeth, is located in the pump housing, and is driven by a central shaft. The cover seals the pump housing and is adjacent to the one or more internal gear rotors. Each infeed reniform suction chamber has a first end and a second end, and at least partially covers end areas of the teeth. Each discharge reniform pressure chamber has a first end and a second end, and at least partially covers the end areas of the teeth. The reniform pressure chamber extension has a first end and a second end and is located in the cover opposite the discharge reniform pressure chamber. The first end of the discharge reniform pressure chamber is substantially adjacent to the first end of the reniform pressure chamber extension. A radial distance between the first and second ends of the reniform pressure chamber extension is less than a radial distance between the first and second ends of the discharge renifo…