Sintered rotor for a rotary pump and a manufacturing method for

Details Sintered rotor for a rotary pump and a manufacturing method for Sintered rotor for a rotary pump and a manufacturing method for

1982-12-09

1985-03-12

Vrablik, John J.

Rotary expansible chamber devices

Working chamber surface expressed mathematically

418171, 291564R, F04C 210, B22F 508

Patent

active

045042020

ABSTRACT:
A sintered outer rotor for a rotary pump utilizing the trochoidal curve and a manufacturing method for the rotor, the rotor being formed to make a combinational gap between an inner rotor and the outer rotor as small and constant as possible in order that both the inner and outer rotors are rotatable. The rotor is formed with an eccentricity ratio less than a limit based upon an experimentally obtained function of the ratio of the diameter of the base circle to that of the rolling circle used to form the trochoidal curve, and with corrected circular arcs of the tooth portions such that .vertline..DELTA.b.vertline.+.vertline..DELTA.c.vertline.<0.3 mm and .DELTA.b>.DELTA.c, wherein .DELTA.b and .DELTA.c are respectively the corrections to the centers of the circular arcs and the radii of the circular arcs. The ratio of the base circle to that of the rolling circle is not an integer and therefore is not equal to the number of outer rotor teeth as in the conventional outer rotor.

REFERENCES:
patent: 2965039 (1960-12-01), Morita

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