High pressure pump for a fuel injection system of an internal combustion engine

Abstract

A high-pressure pump for a fuel injection system of an internal combustion engine, having a housing at least one pump element having a pump piston located in the housing and driven in a reciprocating motion via a transmission element by a drive shaft supported rotatably in the housing via at least one bearing point. The drive shaft has an eccentric portion on which the transmission element is rotatably supported via a bearing point. Fuel for lubrication is delivered to the bearing point of the transmission element in the eccentric portion of the drive shaft via a conduit system extending through the drive shaft.

1 - 9 . (canceled)  
   
   
       10 . A high-pressure pump for a fuel injection system of an internal combustion engine, comprising 
 a housing ( 10 ),    at least one pump element ( 32 ) located in housing ( 10 ) and having a pump piston ( 34 ),    a drive shaft ( 12 ) supported rotatably in the housing ( 10 ) via at least one bearing point ( 14 ,  16 ), the drive shaft ( 12 ) having an eccentric portion ( 26 ),    a transmission element ( 28 ) rotatably supported on the eccentric portion ( 26 ) via a bearing point ( 30 ) and driving the pump piston ( 34 ) in a reciprocating motion, and    a conduit system ( 54 ,  55 ,  57 ) extending through the drive shaft ( 12 ) for delivering lubricating fuel to the bearing point ( 30 ) of the transmission element ( 28 ) in the eccentric portion ( 26 ) of the drive shaft ( 12 ).    
   
   
       11 . The high-pressure pump of  claim 10 , wherein the transmission element ( 28 ) is supported on the eccentric portion ( 26 ) via a bearing bush ( 58 ).  
   
   
       12 . The high-pressure pump of  claim 10 , wherein fuel for lubrication is delivered to at least one bearing point ( 16 ) of the drive shaft ( 12 ) in the housing ( 10 ), via the conduit system ( 54 ,  55 ,  60 ) in the drive shaft ( 12 ), and wherein the drive shaft ( 12 ) is supported in the housing ( 10 ) at the at least one bearing point ( 16 ), preferably via a bearing bush ( 24 ).  
   
   
       13 . The high-pressure pump of  claim 11 , wherein fuel for lubrication is delivered to at least one bearing point ( 16 ) of the drive shaft ( 12 ) in the housing ( 10 ), via the conduit system ( 54 ,  55 ,  60 ) in the drive shaft ( 12 ), and wherein the drive shaft ( 12 ) is supported in the housing ( 10 ) at the at least one bearing point ( 16 ), preferably via a bearing bush ( 24 ).  
   
   
       14 . The high-pressure pump of  claim 11 , wherein the bearing bush ( 22 ,  24 ,  58 ) of the transmission element ( 28 ) and/or of the drive shaft ( 12 ) is split into two parts, located side by side in the direction of the pivot axis ( 13 ) of the drive shaft ( 12 ), between which parts there is a gap ( 23 ,  25 ,  59 ).  
   
   
       15 . The high-pressure pump of  claim 12 , wherein the bearing bush ( 22 ,  24 ,  58 ) of the transmission element ( 28 ) and/or of the drive shaft ( 12 ) is split into two parts, located side by side in the direction of the pivot axis ( 13 ) of the drive shaft ( 12 ), between which parts there is a gap ( 23 ,  25 ,  59 ).  
   
   
       16 . The high-pressure pump of  claim 14 , wherein the gap ( 23 ,  25 ,  59 ) between the parts of the bearing bush ( 22 ,  24 ,  58 ) is located in a plane that is approximately radial to the pivot axis ( 13 ) of the drive shaft ( 12 ), in which plane the conduit system ( 54 ,  55 ,  57 ) discharges at the outer jacket of the drive shaft ( 12 ).  
   
   
       17 . The high-pressure pump of  claim 15 , wherein the gap ( 23 ,  25 ,  59 ) between the parts of the bearing bush ( 22 ,  24 ,  58 ) is located in a plane that is approximately radial to the pivot axis ( 13 ) of the drive shaft ( 12 ), in which plane the conduit system ( 54 ,  55 ,  57 ) discharges at the outer jacket of the drive shaft ( 12 ).  
   
   
       18 . The high-pressure pump of  claim 10 , wherein the conduit system has a first conduit portion ( 54 ), discharging at the outer jacket of the drive shaft ( 12 ), into which portion fuel is delivered through a conduit ( 52 ) extending in the housing ( 10 ); a second conduit portion ( 55 ), adjoining the first conduit portion ( 54 ) and extending at least substantially in the direction of the pivot axis ( 13 ) of the drive shaft ( 12 ); and at least one third conduit portion ( 57 ), adjoining the second conduit portion and discharging at the outer jacket of the drive shaft ( 12 ) at the bearing point ( 30 ) of the transmission element ( 28 ).  
   
   
       19 . The high-pressure pump of  claim 12 , wherein the conduit system has a first conduit portion ( 54 ), discharging at the outer jacket of the drive shaft ( 12 ), into which portion fuel is delivered through a conduit ( 52 ) extending in the housing ( 10 ); a second conduit portion ( 55 ), adjoining the first conduit portion ( 54 ) and extending at least substantially in the direction of the pivot axis ( 13 ) of the drive shaft ( 12 ); and at least one third conduit portion ( 57 ), adjoining the second conduit portion and discharging at the outer jacket of the drive shaft ( 12 ) at the bearing point ( 30 ) of the transmission element ( 28 ).  
   
   
       20 . The high-pressure pump of  claim 14 , wherein the conduit system has a first conduit portion ( 54 ), discharging at the outer jacket of the drive shaft ( 12 ), into which portion fuel is delivered through a conduit ( 52 ) extending in the housing ( 10 ); a second conduit portion ( 55 ), adjoining the first conduit portion ( 54 ) and extending at least substantially in the direction of the pivot axis ( 13 ) of the drive shaft ( 12 ); and at least one third conduit portion ( 57 ), adjoining the second conduit portion and discharging at the outer jacket of the drive shaft ( 12 ) at the bearing point ( 30 ) of the transmission element ( 28 ).  
   
   
       21 . The high-pressure pump of  claim 16 , wherein the conduit system has a first conduit portion ( 54 ), discharging at the outer jacket of the drive shaft ( 12 ), into which portion fuel is delivered through a conduit ( 52 ) extending in the housing ( 10 ); a second conduit portion ( 55 ), adjoining the first conduit portion ( 54 ) and extending at least substantially in the direction of the pivot axis ( 13 ) of the drive shaft ( 12 ); and at least one third conduit portion ( 57 ), adjoining the second conduit portion and discharging at the outer jacket of the drive shaft ( 12 ) at the bearing point ( 30 ) of the transmission element ( 28 ).  
   
   
       22 . The high-pressure pump of  claim 18 , wherein the conduit ( 52 ) extending in the housing ( 10 ) discharges at a bearing point ( 14 ) of the drive shaft ( 12 ) at which the drive shaft ( 12 ) is supported in the housing ( 10 ) via a bearing bush ( 22 ); wherein the first conduit portion ( 54 ) in the bearing bush ( 22 ) discharges at the outer jacket of the drive shaft ( 12 ); and wherein its communication with the conduit ( 52 ) extending in the housing ( 10 ) is made through the bearing bush ( 22 ).  
   
   
       23 . The high-pressure pump of  claim 19 , wherein the conduit ( 52 ) extending in the housing ( 10 ) discharges at a bearing point ( 14 ) of the drive shaft ( 12 ) at which the drive shaft ( 12 ) is supported in the housing ( 10 ) via a bearing bush ( 22 ); wherein the first conduit portion ( 54 ) in the bearing bush ( 22 ) discharges at the outer jacket of the drive shaft ( 12 ); and wherein its communication with the conduit ( 52 ) extending in the housing ( 10 ) is made through the bearing bush ( 22 ).  
   
   
       24 . The high-pressure pump of  claim 20 , wherein the conduit ( 52 ) extending in the housing ( 10 ) discharges at a bearing point ( 14 ) of the drive shaft ( 12 ) at which the drive shaft ( 12 ) is supported in the housing ( 10 ) via a bearing bush ( 22 ); wherein the first conduit portion ( 54 ) in the bearing bush ( 22 ) discharges at the outer jacket of the drive shaft ( 12 ); and wherein its communication with the conduit ( 52 ) extending in the housing ( 10 ) is made through the bearing bush ( 22 ).  
   
   
       25 . The high-pressure pump of  claim 21 , wherein the conduit ( 52 ) extending in the housing ( 10 ) discharges at a bearing point ( 14 ) of the drive shaft ( 12 ) at which the drive shaft ( 12 ) is supported in the housing ( 10 ) via a bearing bush ( 22 ); wherein the first conduit portion ( 54 ) in the bearing bush ( 22 ) discharges at the outer jacket of the drive shaft ( 12 ); and wherein its communication with the conduit ( 52 ) extending in the housing ( 10 ) is made through the bearing bush ( 22 ).  
   
   
       26 . The high-pressure pump of  claim 22 , wherein the bearing bush ( 22 ), in its inner jacket, has an annular groove ( 62 ), which is located in a radial plane with respect to the pivot axis ( 13 ) of the drive shaft ( 12 ), in which plane the conduit system ( 54 ) discharges at the outer jacket of the drive shaft ( 12 ), and which plane preferably communicates with the outer jacket of the bearing bush ( 22 ) via at least one bore ( 64 ) in the bearing bush ( 22 ).  
   
   
       27 . The high-pressure pump of  claim 23 , wherein the bearing bush ( 22 ), in its inner jacket, has an annular groove ( 62 ), which is located in a radial plane with respect to the pivot axis ( 13 ) of the drive shaft ( 12 ), in which plane the conduit system ( 54 ) discharges at the outer jacket of the drive shaft ( 12 ), and which plane preferably communicates with the outer jacket of the bearing bush ( 22 ) via at least one bore ( 64 ) in the bearing bush ( 22 ).  
   
   
       28 . The high-pressure pump of  claim 24 , wherein the bearing bush ( 22 ), in its inner jacket, has an annular groove ( 62 ), which is located in a radial plane with respect to the pivot axis ( 13 ) of the drive shaft ( 12 ), in which plane the conduit system ( 54 ) discharges at the outer jacket of the drive shaft ( 12 ), and which plane preferably communicates with the outer jacket of the bearing bush ( 22 ) via at least one bore ( 64 ) in the bearing bush ( 22 ).  
   
   
       29 . A fuel injection system of an internal combustion engine having a high-pressure pump according to  claim 10 , wherein fuel is delivered to the high-pressure pump ( 100 ) by a feed pump ( 140 ); wherein a portion of the fuel pumped by the feed pump ( 140 ) is delivered to the conduit system ( 54 ,  55 ,  57 ,  60 ) via a lubrication connection ( 170 ); and wherein a pressure valve ( 180 ), opening toward the conduit system ( 54 ,  55 ,  57 ,  60 ), and/or a throttle restriction ( 190 ) is preferably located in the lubrication connection ( 170 ).