Regulating pump

US4750867A · kind A · utility

Inventors

• Siegfried Hertell · Radevormwald, DE
• Dieter Otto · Achern, DE

Key dates

• Filing date: Jan 9, 1987
• Grant date: Jun 14, 1988
• Expiry date: Jan 9, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C14/26
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A hydraulic gear pump is disclosed wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The fluid is expelled to a common discharge chamber through a plurality of outlets which are positioned along the rotational direction and which are separated by a distance corresponding to the pitch of the gear teeth. The inlet to the pump includes at least two parallel lines which are each connected to a tank, and the first line is provided with a fixed throttle, and the second line is provided with a pressure control valve which is controlled by the pressure in the pump discharge chamber. The inlet may include a third parallel line, which is provided with a further valve and which is controlled by an externally monitored parameter.