Piston pump

Abstract

A piston pump ( 10 ) for supplying pressure fluid into at least one vehicle brake, into a master cylinder, into a pressure fluid reservoir, or into a pressure fluid accumulator of a controlled vehicle brake system, is integrated into an accommodating member ( 3 ) in a simple and space-saving manner. A plurality of valve seats ( 38, 54 ) of non-return valves ( 32, 33, 36, 37 ) are kept as free as possible from pressing or attaching forces in that a sleeve ( 18, 19 ) has a radial flange for being secured in position between a closing member ( 52 ) and the accommodating member ( 3 ).

1 - 9 . (canceled)  
   
   
       10 . A piston pump ( 10 ) for supplying pressure fluid for a controlled vehicle brake system, including the following features: 
 a piston ( 16 ,  17 ) is movably arranged in a stepped bore ( 64 ) of an accommodating member ( 3 ) provided with a closing member ( 52 );    the piston ( 16 ,  17 ) is guided in a sleeve ( 18 ,  19 ) at least in sections;    the sleeve ( 18 ,  19 ) comprises a non-return valve ( 32 ,  33 ,  36 ,  37 ) which is arranged coaxially to the piston ( 16 ,  17 ) and is used for the ventilation of a working chamber ( 24 ,  25 ) into which the piston ( 16 ,  17 ) plunges;    a resetting spring ( 41 ) is provided within the sleeve ( 18 ,  19 ) between a support ( 47 ) and the piston ( 16 ,  17 ),    wherein the sleeve ( 18 ,  19 ) includes a radial flange ( 51 ), and wherein the radial flange ( 51 ) is compressed between the closing member ( 52 ) and the accommodating member ( 3 ) for securing the sleeve ( 18 ,  19 ) axially in position.    
   
   
       11 . The piston pump as claimed in  claim 10 , 
 wherein the stepped bore ( 64 ) has a bore step ( 69 ) with a bore diameter designed to be larger than the radial flange ( 51 ) for an exclusively axial abutment of the radial flange ( 51 ).    
   
   
       12 . The piston pump as claimed in  claim 10 , 
 wherein the sleeve ( 18 ,  19 ) includes a bowl-shaped portion which is used as a support ( 47 ) for the resetting spring ( 41 ) and has a wall ( 49 ) and a bottom area ( 50 ) on which one end of the resetting spring ( 41 ) is abutting.    
   
   
       13 . The piston pump as claimed in  claim 12 , 
 wherein the portion of the sleeve ( 18 ,  19 ) is bulged to be substantially V-shaped or U-shaped in cross-section so that an indentation provided between the wall ( 49 ) and a collar ( 53 ) is used to accommodate the resetting spring, and wherein an outside indentation formed by the collar ( 53 ) accommodates a non-return valve ( 36 ,  37 ) in such a fashion that resetting spring ( 41 ), sleeve ( 18 ,  19 ) and non-return valve ( 36 ,  37 ) intersect each other at least in the area of the portion in a radial direction R.    
   
   
       14 . The piston pump as claimed in  claim 12 , 
 wherein the collar ( 53 ) in the seat area has a substantially conical portion, the diameter thereof corresponding basically to the diameter of the resetting spring ( 41 ), and wherein the portion engages the resetting spring ( 41 ).    
   
   
       15 . The piston pump as claimed in  claim 12 , 
 wherein the closing member ( 52 ) has a bowl-shaped design and includes a wall ( 66 ) with an end surface ( 67 ) and a bottom ( 68 ), and wherein the sleeve ( 18 ,  19 ) at least with the support ( 47 ) is accommodated in an inner space of the closing member ( 52 ), and wherein the end surface ( 67 ) retains the radial flange ( 51 ) in abutment on the bore step ( 69 ).    
   
   
       16 . The piston pump as claimed in  claim 10 , 
 wherein a seat ( 54 ) for a non-return valve ( 36 ,  37 ) is provided in a bottom area of the sleeve ( 18 ,  19 ).    
   
   
       17 . The piston pump as claimed in  claim 16 , 
 wherein the seat ( 54 ) is provided at the collar ( 53 ).    
   
   
       18 . The piston pump as claimed in  claim 16 , 
 wherein the sleeve ( 18 ,  19 ) and in particular the support ( 47 ) are designed as sheet-metal shaped parts, and wherein these are fastened in the area of the radial flange ( 51 ) to the closing member ( 52 ) by means of calked or pressed engagement.