IMPELLER, FUEL PUMP HAVING THE IMPELLER, AND FUEL SUPPLY APPARATUS HAVING THE FUEL PUMP

摘要

An impeller, a fuel pump having the impeller, and a fuel supply apparatus having the fuel pump are provided to supply fuel steadily at low torque by setting up rearward tilt angle of an inner vane groove at 30~80°. An impeller comprises an inner pump chamber and an outside pump chamber coaxially positioned and a plurality of partitions dividing adjacent inner vane grooves(55). A rear surface is located in a back side of a rotational direction of each inner vane groove. The radius direction inner side of the rear surface rearwards inclines to the radius direction outer side from the radius direction inner side of the rotational direction. A first line connects the radial direction inner end of the rear surface to the radial direction outer end of the rear surface. A second line is extended in a radial direction from the radial direction inner end of the rear surface. Between the first line and the second line, a rearward tilt angle(alpha2) is formed. The rearward tilt angle is satisfied with the relation of 30°<= alpha2 <= 80°.