Control valve having a curved spring band serving as a non-return valve

Abstract

A control valve, in particular a proportional valve for controlling a device for adjusting the rotation angle position of a camshaft with respect to a crankshaft of an internal combustion engine, including a hollow-cylindrical valve housing ( 1 ), which has a plurality of openings ( 2 ) that are arranged circumferentially in a radial plane for connecting to a pressure medium connection (P) and can be closed via a non-return valve ( 4 ) designed as a curved spring band ( 3 ). According to the invention, the openings ( 2 ) arranged in a radial plane are arranged at different angle distances to each other, and the shape and the rotation angle position of the curved spring band ( 3 ) serving as a non-return valve ( 4 ) is matched thereto.

1 . A control valve for controlling a device for adjusting a rotational angle position of a camshaft with respect to a crankshaft of an internal combustion engine, comprising a hollow-cylindrical valve housing and, for connection to a pressure medium connection (P), the housing valve has a plurality of openings which are arranged circumferentially in a radial plane and are closable via a non-return valve formed by a curved spring band the openings which are arranged in the radial plane are arranged at different angular distances from one another, and a shape and a rotational angle position of the curved spring band serving as the non-return valve are matched to said angular distances. 
     
     
         2 . The control valve as claimed in  claim 1 , wherein the curved spring band serving as the non-return valve has an open oval shape. 
     
     
         3 . The control valve as claimed in  claim 1 , wherein the valve housing for receiving the curved spring band in a region of the openings has different wall thicknesses such that an at least partially encircling groove having a varying groove depth is formed on an outer or inner circumferential side of the valve housing. 
     
     
         4 . The control valve as claimed in  claim 3 , wherein a width of the groove substantially corresponds to a width of the spring band. 
     
     
         5 . The control valve as claimed in  claim 1 , wherein opening and closing characteristics of the non-return valve are adjustable via a spring strength of the curved spring band. 
     
     
         6 . The control valve as claimed in  claim 1 , wherein the pressure medium connection (P) is formed as an at least partially encircling groove arranged on an outer circumferential side of the valve housing.