Method for producing a piston pump and piston pump

Abstract

A method is used to produce a piston pump having a housing and a piston subassembly. The piston subassembly is displaceably guided in the housing and has a first, rod-like piston element and a second, sleeve-like piston element. The second piston element is connected to the first piston element via a press fit. At least one transverse bore and a longitudinal bore are arranged in the second piston element. A stop edge for the housing is arranged on the second piston element. The piston subassembly also has an inlet valve, which includes a receiving element, in which an inlet valve spring and an inlet valve sealing element are arranged. The piston subassembly also has a corresponding inlet valve seat, which is arranged on the second piston element. While the second piston element is being machined, the press fit and the longitudinal bore are produced and/or finished in one step.

1 . A method for producing a piston pump having a housing, comprising:
 producing a piston assembly configured to be guided displaceably in the housing, producing the piston assembly including:
 producing a first rod-shaped piston element, 
 producing a second sleeve-shaped piston element, and 
 connecting the second sleeve-shaped piston element to the first rod-shaped piston element via a press fit wherein, producing the second sleeve-shaped piston element includes arranging at least one transverse bore and a longitudinal bore which corresponds with the at least one transverse bore in the second sleeve-shaped piston element, and arranging a stop edge for the housing on the second sleeve-shaped piston element; 
   producing an inlet valve including a receiving element in which an inlet valve spring and an inlet valve sealing element are arranged, and   arranging an inlet valve seat corresponding to the inlet valve on the second sleeve-shaped piston element,
 wherein, during machining of the second sleeve-shaped piston element, the press fit and the longitudinal bore are at least one of produced and finished. 
   
     
     
         2 . The method as claimed in  claim 1 , wherein arranging the stop edge for the housing includes at least one of producing and finishing the stop edge. 
     
     
         3 . The method as claimed in  claim 1 , further comprising at least one of producing and finishing an annular channel by grooving during a machining operation of an outer circumferential face of the second sleeve-shaped piston element. 
     
     
         4 . The method as claimed in  claim 1 , further comprising at least one of producing and finishing the at least one transverse bore. 
     
     
         5 . The method as claimed in  claim 1 , further comprising deburring at least one inner face region of the second sleeve-shaped piston element. 
     
     
         6 . The method as claimed in  claim 1 , wherein producing the second sleeve-shaped piston element includes using a material-removing production process. 
     
     
         7 . The method as claimed in  claim 1 , wherein producing the second sleeve-shaped piston element includes producing the second sleeve-shaped piston element as a turned part. 
     
     
         8 . The method as claimed in  claim 1 , wherein producing the second sleeve-shaped piston element includes at least partially producing the second sleeve-shaped piston element with a stepped tool. 
     
     
         9 . A piston pump comprising:
 a housing;   a piston assembly configured to be guided displaceably in the housing, the piston assembly including:
 a first rod-shaped piston element, and 
 a second sleeve-shaped piston element which is connected to the first piston element via a press fit, the second sleeve-shaped piston element including at least one transverse bore and a longitudinal bore which corresponds with the at least one transverse bore arranged in the second sleeve-shaped piston element; 
   an inlet valve including a receiving element, in which an inlet valve spring and an inlet valve sealing element are arranged; and   a corresponding inlet valve seat which is arranged on the second sleeve-shaped piston element.   
     
     
         10 . The piston pump as claimed in  claim 9 , wherein the housing is configured at least partially as a filter element.