Pump Element for a Hydraulic Unit having a Pump Piston

Abstract

A pump element for a hydraulic unit of a vehicle braking system includes a pump piston that has two piston parts. A first piston part of the two piston parts is produced from a sintering material.

1 . A pump element for a hydraulic unit of a vehicle brake system, comprising:
 a pump piston having two piston parts, wherein a first piston part of the two piston parts includes a sintered material.   
     
     
         2 . The pump element as claimed in  claim 1 , wherein the first piston part is configured with a ring shape and includes at least one duct passing radially through the ring shape and having an axially open configuration. 
     
     
         3 . The pump element as claimed in  claim 2 , wherein the at least one duct has duct walls axially oriented obliquely. 
     
     
         4 . The pump element as claimed in  claim 1 , wherein the first piston part defines a valve orifice with a valve seat, the valve seat having a surface that is impregnated. 
     
     
         5 . The pump element as claimed in  claim 1 , wherein the first piston part is configured to partially surround the second piston part. 
     
     
         6 . The pump element as claimed in  claim 1 , wherein the second piston part is of circular-cylindrical configuration. 
     
     
         7 . The pump element as claimed in  claim 1 , wherein the second piston part includes ceramic. 
     
     
         8 . The pump element as claimed in  claim 1 , further comprising a valve cage arranged on the first piston part, the valve cage being configured in one piece with a sealing ring. 
     
     
         9 . A method for producing a pump piston of a pump element of a hydraulic unit of a vehicle brake system, comprising:
 forming a first piston part by a sintering method; and   pressing the first piston part onto a second piston part.   
     
     
         10 . A hydraulic unit of a vehicle brake system, comprising:
 a pump element for the hydraulic unit, the pump element including a pump piston having two piston parts,   wherein a first piston part of the two piston parts includes a sintered material.