Valve cap for a non-return valve

Abstract

A non-return valve for a hydraulic tensioning system which is used in traction mechanism drives of internal combustion engines and which manipulates a hydraulic fluid flow between a pressure chamber and a reservoir. The non-return valve has a valve body which is inserted in a housing and which is embodied as a ball and which, when the non-return valve is closed, is supported in a spring-loaded fashion against a valve seat of a through-flow cross-section. When the non-return valve is open, the valve body is assigned to a valve seat of the housing and the flow cross-section ( 19 ) of the valve seat ensures a fluid flow through the non-return valve.

1 . A non-return valve of a hydraulic tensioning system of traction mechanism drives of internal combustion engines, inserted between a hydraulic-fluid-filled pressure chamber and a reservoir, comprising:
 a valve body which is inserted in a housing and which is designed as a ball and which, when the non-return valve is closed, is supported under spring loading against a valve seat of a throughflow cross-section,   wherein, when the non-return valve is open, the valve body interacts with a valve seat of the housing, the associated flow cross-section of which ensures a fluid flow through the non-return valve.   
     
     
         2 . The non-return valve as claimed in  claim 1 , wherein the valve seat, which is positioned in a base of the housing, prevents the valve body from being held in a positively locking manner. 
     
     
         3 . The non-return valve as claimed in  claim 1 , wherein the flow cross-sections in a base of the housing are of any desired geometrical design. 
     
     
         4 . The non-return valve as claimed in  claim 3 , wherein the flow cross-sections are of non-circular shape. 
     
     
         5 . The non-return valve as claimed in  claim 3 , wherein the base of the housing has at least an oval, multi-cornered or polygonal flow cross-section. 
     
     
         6 . The non-return valve as claimed in  claim 1 , wherein a plurality of bores is provided as a flow cross-section, with the valve body influencing a fluid flow in all the bores. 
     
     
         7 . The non-return valve as claimed in  claim 6 , wherein the flow cross-section comprises three bores arranged close together. 
     
     
         8 . The non-return valve as claimed in  claim 2 , wherein the flow cross-section is formed in a convexly shaped portion of the base, with a radius of curvature of the base differing from a radius of the valve body. 
     
     
         9 . The non-return valve as claimed in  claim 2 , wherein the base is designed such that a contact surface assigned to the valve body form different curvatures with two mutually perpendicular section planes which each comprise one movement axis of the valve body.