Patent ID: 7500820
Filing Date: 2009-03-10
Classification: F04D

Abstract:
1. An impeller for a fuel pump, the impeller defining a pump passage along a rotative direction of the impeller, the impeller defining the pump passage on both sides in an axial direction of the impeller, the impeller rotating to pressurize fuel in the pump passage, the impeller defining a plurality of vane grooves along the rotative direction, the plurality of vane grooves being respectively on both sides in the axial direction of the impeller, the plurality of vane grooves communicating with the pump passage, the impeller comprising: a plurality of partition walls, each partitioning the plurality of vane grooves, which are adjacent to each other in the rotative direction, wherein each partition wall includes a fore face on a fore side relative to the rotative direction, the fore face includes an inclined face that is inclined to a rear side relative to the rotative direction at least on a radially inner side thereof, the inclined face is inclined by an inclination angle α, and the inclination angle α is equal to or less than 45°, wherein the fore face on the radially outer side of the inclined face is inclined to the fore side relative to the rotative direction with respect to the inclined face, wherein the fore face has a first flat face on the radially outer side of the inclined face, and the first flat face is defined along the radial direction, the impeller further comprising: an annular portion that connects to the plurality of partition walls, wherein the annular portion surrounds the vane groove on a radially outer side thereof, and each of the plurality of partition walls has a cross section being substantially in a V-shape.