Patent ID: 6722856
Filing Date: 2004-04-20
Classification: F04C

Abstract:
A vane-cell pump for a pumped medium, the pump comprising:a housing; a double armed lever mounted in said housing to pivot about a stationary pivot axis disposed between a first and a second lever arm thereof, said first lever arm defining a pump stator having a rotor chamber with an inlet and an outlet, said second lever arm defining a pivot piston external to said pump stator and projecting transverse to said pivot axis, said pivot piston borne in said housing, said housing defining a first side of said pivot piston communicating with pumped medium of a pressure-side of said rotor chamber, and said housing defining a second side of said pivot piston; energy storage means disposed at said second side of said pivot piston to load said pivot piston in opposition to pressure exercised by pumped medium at said first pivot piston side; a pump rotor disposed in said rotor chamber, said pump rotor having a plurality of radially displaceable rotor blades; and a drive shaft passing into said housing and cooperating with said pump rotor, wherein said double armed lever forms a regulation system for automatic pressure control of the vane-cell pump, said second lever arm constituting an actuator of said regulation system to radially pivot said pump stator relative to said pump rotor.