Patent ID: 7717689
Filing Date: 2010-05-18
Classification: F04C,Y10T

Abstract:
1. A rotor apparatus of a pump, comprising: a drive shaft in which a plurality of arcuate circumferential surface sections centering on an axial center and a plurality of flat surface sections are disposed alternately; and an inner rotor having a mounting hole into which said drive shaft is inserted, wherein in said mounting hole, arcuate inner peripheral sections corresponding and equal in number to said arcuate circumferential surface sections and flat surface inner peripheral sections corresponding and equal in number to said flat surface sections are formed alternately, wherein a plurality of centers of said arcuate inner peripheral sections are displaced with respect to an axial center of the inner rotor and radii of said arcuate inner peripheral sections are made larger than radii of said arcuate circumferential surface sections so that the axial center of said inner rotor is positioned between each arcuate inner peripheral section and a center of the radius corresponding to each arcuate inner peripheral section, and wherein a pressure release channel section bounded by the arcuate circumferential surface section and the arcuate inner peripheral section has a shape that increases gradually toward both sides thereof from a center of an arc span length of the arcuate circumferential surface section and a center of an arc span length of the arcuate inner peripheral section.