Cam phaser for double camshaft

Abstract

A cam phaser for a double camshaft, the cam phaser comprising: a rotor; and a stator, wherein the rotor is a rotatable relative to the stator about a rotor axis of the rotor that is coaxial to a longitudinal axis of the stator, wherein a radial vane of the rotor is positionable between two bars of the stator, wherein the radial vane divides an intermediary space formed between the two bars into two pressure cavities, wherein the double camshaft includes a first camshaft that is configured as a hollow cylinder and a second camshaft that is at least partially received in the first camshaft wherein the first camshaft and the second camshaft are rotatable relative to each other, wherein one of the first camshaft and the second camshaft is connected torque proof with the rotor and another of the first camshaft and the second camshaft is connected torque proof with the stator, wherein the rotor is movable by pressures in the two pressure chambers to cause a rotation of the first camshaft and the second camshaft relative to each other, wherein a hydraulic valve is arranged concentric to the first camshaft, the second camshaft and the rotor, and wherein the hydraulic valve is arranged axially between the second camshaft and the rotor.

What is claimed is: 
     
         1 . A cam phaser for a double camshaft, the cam phaser comprising:
 a rotor; and   a stator,   wherein the rotor is a rotatable relative to the stator about a rotor axis of the rotor that is coaxial to a longitudinal axis of the stator,   wherein a radial vane of the rotor is positionable between two bars of the stator,   wherein the radial vane divides an intermediary space formed between the two bars into two pressure cavities,   wherein the double camshaft includes a first camshaft that is configured as a hollow cylinder and a second camshaft that is at least partially received in the first camshaft wherein the first camshaft and the second camshaft are rotatable relative to each other,   wherein one of the first camshaft and the second camshaft is connected torque proof with the rotor and another of the first camshaft and the second camshaft is connected torque proof with the stator,   wherein the rotor is movable by pressures in the two pressure chambers to cause a rotation of the first camshaft and the second camshaft relative to each other,   wherein a hydraulic valve is arranged concentric to the first camshaft, the second camshaft and the rotor, and   wherein the hydraulic valve is arranged axially between the second camshaft and the rotor.   
     
     
         2 . The cam phaser according to  claim 1 , wherein the hydraulic valve is arranged within the first camshaft. 
     
     
         3 . The cam phaser according to  claim 1 , wherein the hydraulic valve is flow connected with a camshaft bearing of the double camshaft. 
     
     
         4 . The cam phaser according to preceding  claim 1 , wherein a coupling is arranged between the second camshaft and the hydraulic valve. 
     
     
         5 . The cam phaser according to  claim 4 , wherein the hydraulic valve is configured to provide the coupling or the double camshaft with lubricant. 
     
     
         6 . The cam phaser according to  claim 5 , wherein the hydraulic valve includes a flowable opening at a face that is oriented towards the coupling. 
     
     
         7 . The cam phaser according to  claim 6 , wherein the opening is configured in a terminal cover of the hydraulic valve. 
     
     
         8 . The cam phaser according to  claim 7 , wherein the opening is configured as a borehole. 
     
     
         9 . The cam phaser according to  claim 4 , wherein a coupling element of the coupling includes a flowable flow channel. 
     
     
         10 . A camshaft arrangement, comprising:
 a first camshaft and a second camshaft,   wherein the second camshaft is rotatably received in the first camshaft, and   wherein the first camshaft and the second camshaft are rotatable relative to each other by the cam phaser according to  claim 1 .   
     
     
         11 . A hydraulic system, comprising:
 the cam phaser according to  claim 1 ; and   a hydraulic valve configured as a central valve.