Camshaft adjusting device

Abstract

A camshaft adjusting device including a stator which is connectable to a crankshaft of an internal combustion engine and a rotor which is connectable to a camshaft and rotatably supported with respect to the stator and a locking device for locking the rotor with respect to the stator with a locking slide ( 2 ) fixed to the stator or fixed to the rotor and produced by a powder metallurgy process and at least one locking pin lockable in the locking slide ( 2 ), in at least one section of a surface edge zone ( 3 ) the locking slide ( 2 ) having a higher density compared to the density of the base material of the locking slide ( 2 ).

What is claimed is: 
     
         1 - 9 . (canceled) 
     
     
         10 . A camshaft adjusting device comprising:
 a stator connectable to a crankshaft of an internal combustion engine;   a rotor mounted rotatably with respect to the stator and is connectable to a camshaft; and   a lock for locking the rotor with respect to the stator via a locking slide fixed to the stator or rotor and manufactured by a powder metallurgy process, and at least one locking pin lockable in the locking slide,   the locking slide having an increased density compared to the density of the base material of the locking slide in at least one section of a surface edge zone, the surface edge zone being a compressed surface edge zone via a further machining operation on the locking slide.   
     
     
         11 . The camshaft adjusting device as recited in  claim 10  wherein an entirety of the surface edge zone of the locking slide has an increased density compared to the density of the base material of the locking slide. 
     
     
         12 . The camshaft adjusting device as recited in  claim 10  wherein the surface edge zone with the increased density has a thickness of 0.01 mm to 100 mm. 
     
     
         13 . The camshaft adjusting device as recited in  claim 10  wherein the surface edge zone with the increased density is situated at least in an area of the locking slide where the locking pin comes to rest in at least one stop position of the rotor. 
     
     
         14 . The camshaft adjusting device as recited in  claim 10  wherein the increased density of the surface edge zone is achieved by overpressing, shot peening, rolling, laser blasting, or impregnation of the locking slide. 
     
     
         15 . The camshaft adjusting device as recited in  claim 10  wherein the increased density of the surface edge zone is achieved by a composite material having a higher density than the base material of the locking slide. 
     
     
         16 . The camshaft adjusting device as recited in  claim 10  wherein the increased density of the surface edge zone is achieved by a finishing or quenching/tempering process. 
     
     
         17 . The camshaft adjusting device as recited in  claim 10  wherein the increased density of the surface edge zone is achieved by a heat treatment method or a coating method. 
     
     
         18 . The camshaft adjusting device as recited in  claim 10  wherein the increased density of the surface edge zone is achieved by a combined mechanical and thermal method.