Delivery Unit

Abstract

A delivery unit for delivering fuel from a tank to the internal combustion engine of a motor vehicle comprises an impeller revolving in a pump chamber. The impeller, on at least one end face, has a ring of blades spaced apart from one another in the circumferential direction. The impeller blades each have one front side leading in the direction of revolution and one rear side trailing in the direction of revolution. The blades have at least one triangular, oval, circular, or circular-sector-shaped oblique face on the radially outward front side and/or the radially inward rear side in the region of the end faces, which advantageously enlarges an inflow and outflow face formed between the blades and discharging into the chamber, thereby increasing efficiency of the delivery unit.

1 - 7 . (canceled) 
   
   
       8 . A delivery unit for delivering fuel from a tank to an internal combustion engine of a motor vehicle, comprising:
 an impeller revolving in a pump chamber;   a ring of blades spaced apart from one another in the circumferential direction on at least one end face of the impeller;   each blade of the impeller having one front side leading in a direction of revolution and one rear side trailing in the direction of revolution; and   at least one oblique face, disposed radially outward on a front side and/or radially inward on a rear side in a region of the end faces.   
   
   
       9 . The delivery unit according to  claim 8 , wherein the oblique face of the blades is formed such that an imaginary oblique section from one end of the blades extends with decreasing depth (T) in the radial direction of an opposite end of the blades. 
   
   
       10 . The delivery unit according to  claim 8 , wherein the oblique face has edges, disposed on the oblique face and which extend in an opposite direction from adjoining edges of adjacent faces. 
   
   
       11 . The delivery unit according to  claim 8 , wherein the oblique face is embodied such that it enlarges an inflow and outflow face that is formed between the blades and opens out into a chamber disposed between the blades. 
   
   
       12 . The delivery unit according to  claim 8 , wherein the oblique face is curved or plane. 
   
   
       13 . The delivery unit according to  claim 8 , wherein the oblique face is a portion of triangular, oval, circular, or circular-sector-shaped to the surface of the front side and rear side. 
   
   
       14 . The delivery unit according to  claim 8 , wherein a radial length of the oblique face with regard to a pump axis is less than a radial length of the blades. 
   
   
       15 . The delivery unit according to  claim 8 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped. 
   
   
       16 . The delivery unit according to  claim 9 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped. 
   
   
       17 . The delivery unit according to  claim 10 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped. 
   
   
       18 . The delivery unit according to  claim 11 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped. 
   
   
       19 . The delivery unit according to  claim 12 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped. 
   
   
       20 . The delivery unit according to  claim 13 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped. 
   
   
       21 . The delivery unit according to  claim 14 , wherein the oblique face is triangular, oval, circular, or circular-sector-shaped.