Camshaft adjuster with a central valve and without a t branch

Abstract

A hydraulic camshaft adjuster having: a stator with a radially inwardly opening working chamber a rotor arranged radially within the stator, wherein the rotor receives a vane dividing the working chamber into two part chambers, and rotatable relative to the stator about a rotational axis dependent on a hydraulic pressure set in the part chambers . A central valve controls the hydraulic pressure and is configured for selectively connecting individual hydraulic lines which open into the part chambers among one another and/or to a supply line.A check valve device is integrated per part chamber into a first hydraulic line configured in the vane, which check valve device is arranged to act in a permanently closing manner in a first hydraulic flow direction from the central valve into the respective part chamber and can be opened dependent on the hydraulic pressure in a second hydraulic flow direction which is opposed to the first hydraulic flow direction.

1 - 10 . (canceled) 
     
     
         11 . A vane cell hydraulic camshaft adjuster comprising:
 a stator with a radially inwardly opening working chamber;   a rotor situated radially within the stator, the rotor accommodating a vane extending into the working chamber dividing the working chamber into first and second subchambers, the rotor being rotatable relative to the stator about a rotation axis as a function of a hydraulic pressure set in the first and second subchambers, and a central valve controlling the hydraulic pressure and designed for selectively connecting individual hydraulic lines, opening into the first and second subchambers to one another or to a supply line;   for each of the first and second subchambers, a respective check valve device being integrated into a first hydraulic line provided in the vane so as to define first and second check valve devices, the first and second check valve devices being situated to act in a permanently blocking manner in a first hydraulic flow direction from the central valve into the respective first or second subchamber, and openable in a second hydraulic flow direction opposite the first hydraulic flow direction.   
     
     
         12 . The camshaft adjuster as recited in  claim 11  wherein first check valve device is situated in the first hydraulic line toward one side of the first subchamber. 
     
     
         13 . The camshaft adjuster as recited in  claim 11  wherein the second check valve device is situated in the first hydraulic line toward one side of the second subchamber. 
     
     
         14 . The camshaft adjuster as recited in  claim 11  wherein the first and second check valve devices are inserted into an inner cavity of the vane. 
     
     
         15 . The camshaft adjuster as recited in  claim 11  wherein each of the first and second check valve devices is designed as a sheet metal part, a sheet metal section of the particular first or second check valve device being elastically bendable in the second hydraulic flow direction. 
     
     
         16 . The camshaft adjuster as recited in  claim 11  wherein the first hydraulic line is connected to the central valve, passing radially inwardly from the vane through the rotor. 
     
     
         17 . The camshaft adjuster as recited in  claim 11  wherein a second hydraulic line directly connects the first subchamber to the central valve. 
     
     
         18 . The camshaft adjuster as recited in  claim 11  wherein a third hydraulic line directly connects the second subchamber to the central valve. 
     
     
         19 . The camshaft adjuster as recited in  claim 11  wherein the supply line is connectable to a pump conveying a hydraulic medium in the direction of the central valve, a third check valve device being integrated into the supply line. 
     
     
         20 . The camshaft adjuster as recited in  claim 11  wherein the camshaft adjuster is adjustable as a function of a torque applied to the rotor.