Reciprocating pump and use of said reciprocating pump

Abstract

The invention relates to a reciprocating pump comprising a drive shaft ( 2 ) that is mounted in a housing ( 1 ) and that has a freely definable and in exceptional cases sinusoidal control curve ( 5 ). A transmission element ( 6 ) that is connected to a piston ( 4 ) penetrates the control curve ( 5 ). The transmission element ( 6 ) is guided in an elongated guide section ( 7 ) of the housing ( 1 ). The displacement directions of the piston ( 4 ) run parallel to the rotational axis of the drive shaft ( 2 ). The reciprocating pump is extremely compact and is particularly suitable for use as a fuel pump in a motor vehicle.

1 . A reciprocating pump with at least one piston arranged axially displaceably in a casing, with a rotatably mounted drive shaft for driving the piston, with an inlet channel and with an outlet channel, characterized in that the drive shaft has a control curve with at least one upper reversal point and one lower reversal point, in that the piston is guided in the control curve, and in that a transmission element extends from the piston into the control curve.  
   
   
       2 . The reciprocating pump as claimed in  claim 1 , characterized in that the transmission element is led through an elongated guide in the casing.  
   
   
       3 . The reciprocating pump as claimed in  claim 1  or  2 , characterized in that a plurality of pistons are arranged concentrically with respect to the drive shaft.  
   
   
       4 . The reciprocating pump as defined in  claim 1 , wherein the inlet channel passes through the piston and has a nonreturn valve.  
   
   
       5 . The reciprocating pump as defined in  claim 4 , wherein the nonreturn valve of the inlet channel and/or a nonreturn valve of the outlet channel are/is designed as a diaphragm valve.  
   
   
       6 . The reciprocating pump as defined in  claim 4 , wherein the nonreturn valve of the inlet channel and/or the nonreturn valve of the outlet channel have/has a valve body guided longitudinally displaceably and located opposite a valve seat.  
   
   
       7 . The reciprocating pump as defined in  claim 1 , wherein a recess in the form of a peripheral groove is provided for receiving the transmission element.  
   
   
       8 . The reciprocating pump as defined in  claim 1 , wherein the piston has a pocket, shaped correspondingly to the transmission element, for receiving a part region of the transmission element.  
   
   
       9 . The reciprocating pump as defined in  claim 8 , wherein the transmission element is designed as a ball.  
   
   
       10 . The reciprocating pump as defined in  claim 8 , wherein the transmission element is designed as a sliding block.  
   
   
       11 . The reciprocating pump as defined in  claim 2 , wherein the guide in the casing is arranged on a straight line connecting the axes of symmetry of the piston and of the drive shaft.  
   
   
       12 . The reciprocating pump as defined in  claim 2 , wherein the guide in the casing is arranged outside the straight line connecting the axes of symmetry of the piston and of the drive shaft.  
   
   
       13 . The reciprocating pump as defined in  claim 2 , wherein the guide of the transmission element has lateral bearing faces that are prestressed relative to one another.  
   
   
       14 . The reciprocating pump as defined in  claim 1 , wherein the drive shaft has a rim surrounding the piston at least partially radially on the outside, and the control curve is arranged on the rim radially on the inside.  
   
   
       15 . The reciprocating pump as defined in  claim 1 , wherein the piston is arranged between two control curves, in which one radially surrounds the other concentrically.  
   
   
       16 . The reciprocating pump as defined in  claim 1 , wherein the control curve has a plurality of upper and lower reversal points over the circumference of the drive shaft.  
   
   
       17 . The reciprocating pump as defined in  claim 1 , wherein the control curve has, during an intake stroke, at least one curve function other than during an ejection stroke.