Control valve

Abstract

A control valve, particularly for a device for altering the actuation periods of an internal combustion engine, which has a valve housing that is configured with a substantially hollow cylindrical structure, a control piston disposed inside the valve housing and is axially displaceable therein, and a closing element. The control piston has at least one section with a hollow structure that ends in an opening of the control piston and the closing element is disposed in the opening.

1 . A control valve for a device for varying the control times of an internal combustion engine, comprising:
 an essentially hollow-cylindrically designed valve housing;   an axially displaceable control piston arranged inside the valve housing; and   a closing element,   the control piston having at least one portion of hollow design which issues into an orifice of the control piston, and   the closing element being arranged in the orifice,   wherein the closing element has a circumferential wall which is adapted essentially to an inner surface area of the control piston in a region of the orifice,   the circumferential wall having at least one material receptacle of smaller outside diameter,   the material receptacle being followed in an axial direction of the closing element by a region of larger outside diameter on a side facing away from the orifice, and   the inner surface area of the control piston engaging into the material receptacle.   
     
     
         2 . The control valve of  claim 1 , wherein the material receptacle an annular groove proceeding in a circumferential direction of the closing element. 
     
     
         3 . The control valve of  claim 1 , wherein the material receptacle is a pocket. 
     
     
         4 . The control valve of  claim 1 , wherein the material receptacle is a chamfer of a circumferential edge of an axial sidewall of the closing element. 
     
     
         5 . The control valve of  claim 1 , wherein the outside diameter of the control piston is made smaller in the region of the material receptacle than a maximum outside diameter of the control piston. 
     
     
         6 . The control valve of  claim 1 , wherein the closing element is connected to the control piston by means of a materially integral connection, an adhesive bond, a soldered joint or a welded joint. 
     
     
         7 . A control valve for a device for varying control times of an internal combustion engine, comprising:
 an essentially hollow-cylindrically designed valve housing;   an axially displaceable control piston arranged inside the valve housing; and   a closing element,   the control piston having at least one portion of hollow design which issues into an orifice of the control piston, and   the closing element being arranged in the orifice,   wherein the closing element is connected to the control piston by means of a materially integral connection, an adhesive bond, a soldered joint or a welded joint.   
     
     
         8 . A method for producing a control valve for a device for varying control times of an internal combustion engine, comprising:
 an essentially hollow-cylindrically designed valve housing;   an axially displaceable control piston arranged inside the valve housing; and   a closing element,   the control piston having at least one portion of hollow design which issues into an orifice of the control piston, having the following steps:   positioning of the closing element inside the orifice of the control piston, and   displacement of material of the control piston radially inward in the region of the closing element.   
     
     
         9 . The method of  claim 8 , wherein the material of the control piston is displaced radially inward by means of radial embossing, radial circumferential calking or radial segmental calking of the control piston. 
     
     
         10 . The method of  claim 8 , wherein the material of the control piston is displaced radially inward by means of axial embossing, axial annular calking or axial segmental calking of an axial side face of the control piston. 
     
     
         11 . The method of  claim 8 , wherein the material is displaced into at least one material receptacle formed on a circumferential face of the closing element.