Transfer pump with several pistons

Abstract

Transfer pump of the type in which the moving part for pumping is a bellows ( 4 ) that is alternately filled with and emptied of hydraulic liquid at high pressure by a piston ( 1 ) that is driven by a cam ( 2 ), whereby the amount of fuel allowed into the chamber ( 5 ) into which the bellows ( 4 ) moves is determined, upstream, by a solenoid valve ( 8 ) that is driven by the computer for monitoring the engine, characterized by the fact that it comprises at least two pumping units (piston 1 /bellows 4 ) that are supplied by a single intake system ( 6 ) that is common to the units on which the flow-monitoring solenoid valve ( 8 ) is placed and that have a conveyor circuit ( 10 ) that may be unique and common, or specific to each pumping unit.

1 . Transfer pump of the type in which the moving part for pumping is a bellows ( 4 ) that is alternately filled with and emptied of hydraulic liquid at high pressure by a piston ( 1 ) that is driven by a cam ( 2 ), whereby the amount of fuel allowed into the chamber ( 5 ) into which the bellows ( 4 ) moves is determined, upstream, by a solenoid valve ( 8 ) that is driven by the computer for monitoring the engine, characterized by the fact that it comprises at least two pumping units (piston  1 /bellows  4 ) that are supplied by a single intake system ( 6 ) that is common to the units on which the flow-monitoring solenoid valve ( 8 ) is placed and that has a conveyor circuit ( 10 ) that may be unique and common, or specific to each pumping unit. 
   
   
       2 . Pump according to  claim 1 , wherein the pistons ( 1 ) are actuated by at least one single-lobe or multi-lobe cam ( 2 ). 
   
   
       3 . Pump according to  claim 2 , comprising several pistons ( 1   a,    1   b  . . .  1   n ) that drive bellows ( 4   a,    4   b  . . .  4   n ) that are arranged in chambers ( 5   a,    5   b  . . .  5   n ) that are connected to a common supply circuit ( 6 ). 
   
   
       4 . Pump according to  claim 3 , wherein the chambers ( 5   a,    5   b  . . .  5   n ) are connected to a common conveyor circuit ( 10 ). 
   
   
       5 . Pump according to  claim 1 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by single-lobe or multi-lobe cams ( 2   a,    2   b  . . .  2   n ) that are arranged in parallel on a camshaft ( 3 ). 
   
   
       6 . Pump according to  claim 3 , wherein the chambers ( 5   a,    5   b  . . .  5   n ) are each connected to a conveyor circuit that is specific thereto. 
   
   
       7 . Pump according to  claim 1 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by a single cam ( 2 ), whereby said pistons are arranged radially around the cam ( 2 ). 
   
   
       8 . Pump according to  claim 2 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by single-lobe or multi-lobe cams ( 2   a,    2   b  . . .  2   n ) that are arranged in parallel on a camshaft ( 3 ). 
   
   
       9 . Pump according to  claim 3 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by single-lobe or multi-lobe cams ( 2   a,    2   b  . . .  2   n ) that are arranged in parallel on a camshaft ( 3 ). 
   
   
       10 . Pump according to  claim 4 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by single-lobe or multi-lobe cams ( 2   a,    2   b  . . .  2   n ) that are arranged in parallel on a camshaft ( 3 ). 
   
   
       11 . Pump according to  claim 2 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by a single cam ( 2 ), whereby said pistons are arranged radially around the cam ( 2 ). 
   
   
       12 . Pump according to  claim 3 , wherein the pistons ( 1 a,  1   b  . . .  1   n ) are actuated by a single cam ( 2 ), whereby said pistons are arranged radially around the cam ( 2 ). 
   
   
       13 . Pump according to  claim 4 , wherein the pistons ( 1   a,    1   b  . . .  1   n ) are actuated by a single cam ( 2 ), whereby said pistons are arranged radially around the cam ( 2 ).