Double pump

US4621982A · kind A · utility

Assignees

• Vickers Systems · GB
• Daimler-Benz AG · DE

Inventors

• Rene Schulz · Rabenau, DE
• Heinrich J. Braum · Bad Homburg vor der Höhe, DE
• Kurt Nadolny · Erdmannhausen, DE
• Van-Trung Nguyen · Stuttgart, DE

Key dates

• Filing date: Nov 12, 1985
• Grant date: Nov 11, 1986
• Expiry date: Nov 12, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16B2200/63
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A main pump (rotary vane pump 1) and a secondary pump (radial piston pump 2) are driven by way of a common shaft (3), a cam ring (30) being used to drive the secondary pump. The cam ring is coupled to the shaft (3) by way of a shear pin (33). If the auxiliary pump locks, the shear pin fractures and the cam ring (30) can rotate relative to the shaft (3). In that case, the fracture portions of the shear pin (33) are driven into their respective bores (34, 35), thereby avoiding excessive friction and overheating. Therefore, the main pump can continue to operate in spite of the failure of the auxiliary pump.