Sintered metal rotor of a rotary piston pump

A method for producing a sintered metal rotor of a rotary piston pump, in particular a rotary piston pump for generating a vacuum of a vacuum brake booster of a motor vehicle, where the brake booster can be connected to a vacuum pump intake connection, with a pot-shaped base body (1) and a bearing journal element which protrudes centrally from the bottom of this base body (1) from a cylindrical foot area coming directly out of the bottom and a connecting claw section (2) to be connected to it for a coupling element to be attached, comprising the features

• the connecting claw section (2) is designed in the form of two protruding individual webs (3),
• the individual webs (3) are diametrically opposed in the outside circumferential area of the cylindrical base section in an area limited to max. 100° at the circumference and radially to max. 25% of the diameter of the cylindrical base section, and
• assigning separate rams to the individual webs (3) according to cross section of the web and providing each ram with a separate pressure acting on them in a sintering compression mold for producing the sintered rotor;
• and
• wherein the produced rotor has the structure of a one piece, press-sintered rotor with differently compressed regions, whereby the individual webs (3) are compressed to a sufficient degree for the material stability required in each region, and the sintering pressure is sufficient to achieve a material density of 6.8 to 7.4 g/cm3.