Patent ID: 8123459
Filing Date: 2012-02-28
Classification: F04D

Abstract:
1. An impeller for a fuel pump having an outer pump chamber and an inner pump chamber being substantially coaxial with each other, the impeller comprising: a plurality of partition walls provided at least in a region corresponding to the inner pump chamber and arranged in the rotative direction, each of the plurality of partition walls partitioning inner vane grooves, which are adjacent to each other, wherein a rear surface is located at a rear side in a rotative direction of each of the inner vane grooves, at least a radially inner side of the rear surface inclines rearward in the rotative direction from a radially inner side to a radially outer side, a backward tilt angle α wherein the rear surface at least partially inclines rearward in the rotative direction from one end side in a rotation axis direction to an other end in the rotation axis direction, the rear surface has a plurality of surfaces intersecting with each other, and the following condition is satisfied: an inclination angle β the inclination angle β the inclination angle β