Axial piston pumps

US4449444A · kind A · utility

Assignee

• Linde GmbH · DE

Inventor

• Franz Forster · Karlstadt, DE

Key dates

• Filing date: Jul 13, 1981
• Grant date: May 22, 1984
• Expiry date: Jul 13, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B1/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An axial piston pump is provided for producing two output streams that can be regulated independently of each other with respect to size and pressure. A pump according to the invention includes a housing, a revolving cylindrical drum in said housing, a drive shaft connected to said drum for rotating the same, a plurality of spaced holes in said drum on two different pitch diameters generally parallel to the drum axis and opening to a common end face of said drum, a plurality of pistons reciprocable in said holes, a rotary slide control valve acting on the opposite end face of said drum, a first tapered washer or swash plate bearing on one end of said pistons moving in the holes of the smaller pitch diameter, a second tapered washer or swash plate surrounding the first tapered washer and bearing on one end of the pistons moving in the holes of larger pitch diameter, means engaging said first and second tapered washers independently to move them relatively to one another at an angle to the axis of the drum and a pair of separate outlet ports on said rotary valve receiving fluid independently from each of the pistons of different pitch diameter and delivering the same from the pump.