Radial piston pump

Abstract

The invention proposes a radial piston pump with a pump body, in which pistons and cylinders are placed radially to a drive eccentric. The pistons, upon a suction thrust draw in a fluid through an intake port, which opens into the cylinder and upon a pressure thrust the fluid is expelled into a reserve tank. The geometry of the intake ports ( 13 to 19 ) is so conceived, that a lower pressure increase gradient is achieved within the cylinder ( 2 ).

1 - 8 . (canceled)  
   
   
       9 . A radial piston pump with a pump body, in which pistons and cylinders are placed radially about a drive eccentric, whereby a respective piston, during a suction thrust draws in a fluid through an intake port, the intake port opens into the cylinder, and, conversely, upon a pressure thrust of the piston, the fluid is ejected through a check valve into a reserve tank, a geometry of the intake port is so predetermined, that during the pressure thrust of the piston ( 3 ), a rate of increase gradient in the cylinder is reduced.  
   
   
       10 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 13 ) exhibits a straight line under edge ( 9 ) and a curved upper edge ( 10 ), which bind together two ends of the under edge ( 9 ).  
   
   
       11 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 14 ) exhibits a straight line under edge ( 9 ) and two straight line sections ( 20 ,  21 ) contacting said under edge ( 9 ) at an angle, so that an equilateral triangle is formed.  
   
   
       12 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 15 ) exhibits a straight line under edge ( 9 ), two side edges ( 11 ,  11 ′) extending perpendicularly to the under edge ( 9 ) and one upper edge, which is comprised of two straight line sections ( 22 ,  22 ′), which run parallel to the under edge ( 9 ) and which the straight line sections ( 22 ,  22 ′) are bound together by a curve ( 23 ) extending away from the under edge ( 9 ).  
   
   
       13 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 16 ) possesses a straight line under edge ( 9 ), two side edges ( 11 , 11 ′) perpendicular thereto and an upper edge ( 23 ), curves in a direction toward the under edge ( 9 ).  
   
   
       14 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 17 ) possesses a shape of a circle ( 24 ).  
   
   
       15 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 18 ) has a straight line under edge ( 9 ), two side edges ( 11 ,  11 ′) perpendicular thereto and a curvingly connected upper edge which comprises two straight line sections ( 25 ,  25 ′), running at an angle to the under edge ( 9 ) and which are bound together by a curvature ( 26 ) extending away from the under edge ( 9 ).  
   
   
       16 . The radial piston pump according to  claim 9 , wherein the geometry of the intake port ( 19 ) exhibits a straight line under edge ( 9 ), two side sections ( 11 ,  11 ′) perpendicular thereto, and an upper edge, which is made of two, curved upper sections ( 27 ,  27 ′) extending in a direction of the under edge ( 9 ), which said upper sections are joined together by means of one curvature ( 28 ) extending away from the under straight edge ( 9 ).