Piston Pump

Abstract

A support ring of a sealing ring of a piston pump of a slip-controlled vehicle brake system is designed with longitudinal grooves in order to prevent a pressure build-up between the sealing ring and the support ring due to slip leakage.

1 . A piston pump for a hydraulic vehicle brake system having a slip control system, comprising:
 a cylinder defining an accumulator or pump chamber,   a piston configured to be moved axially in the cylinder and driven so as to perform an axially reciprocating stroke motion in the cylinder,   a sealing ring configured to seal off the piston in the cylinder, and   a support ring arranged on a side of the sealing ring facing away from the accumulator or pump chamber and configured to support the sealing ring axially on the side facing away from the accumulator or pump chamber,   wherein the support ring has at least one longitudinal passage for fluid.   
     
     
         2 . The piston pump as claimed in  claim 1 , wherein the support ring has at least one longitudinal groove as a longitudinal passage. 
     
     
         3 . The piston pump as claimed in  claim 1 , wherein:
 the piston is a compensating piston configured to reduce a pressure pulsation of the piston pump, said piston communicating with at least one pump piston of the piston pump, and   the piston and the cylinder do not have any fluid control.   
     
     
         4 . The piston pump as claimed in  claim 1 , wherein the sealing ring has an encircling bead on the outside and/or the inside thereof, the crest of which rests in a sealing manner on the cylinder and/or the piston. 
     
     
         5 . The piston pump as claimed in  claim 4 , wherein the sealing ring has a quadrilateral ring cross section with the encircling bead on the outside and/or the inside. 
     
     
         6 . The piston pump as claimed in  claim 1 , wherein the cylinder has a closed end.