Internal combustion engine valve drive adjustment device

Abstract

In a device for adjusting a valve drive of a motor vehicle internal combustion engine having at least one camshaft provided with first and second cam elements supported in an axially displaceable manner and each having cam tracks for actuating engine valves, the first cam elements have a number of cam tracks for actuating respective valves associated with the first cam elements and a different number of cam tracks for actuating valves associated with the second cam elements.

What is claimed is: 
     
         1 . A device for adjusting a motor vehicle valve drive having at least one camshaft ( 10 ) provided with at least first and second cam elements ( 11 ,  14 ,  12 ,  13 ) arranged on the camshaft in an axially displaceable manner, and having each at least two different cam tracks disposed adjacent one another for actuating a particular valve, the number of cam tracks ( 15 ,  16 ,  17 ,  18 ,  19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  27 ,  28 ,  29 ,  30 ,  31 ,  32 ,  33 ,  34 ) for actuating a valve of one of the cam elements ( 11 ,  14   i,    12 ,  13 ) and the number of cam tracks ( 15 ,  16 ,  17 ,  18 ,  19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  27 ,  28 ,  29 ,  30 ,  31 ,  32 ,  33 ,  34 ) for actuating a valve of another of the cam elements ( 11 ,  14   i,    12 ,  13 ) being different from one another. 
     
     
         2 . The device for adjusting a motor vehicle valve drive according to  claim 1 , wherein the cam elements ( 11 ,  12 ,  13 ,  14 ) arranged in an axially displaceable manner in each case have at least two cam tracks ( 15 ,  16 ,  17 ,  18 ,  19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  27 ,  28 ,  29 ,  30 ,  31 ,  32 ,  33 ,  34 ) per valve for adjusting a valve lift of at least one valve of a cylinder. 
     
     
         3 . The device for adjusting a motor vehicle valve drive according to  claim 1 , wherein at least one of the cam elements ( 12 ,  13 ) has at least one cam track ( 19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ) providing for a valve lift, and has one cam track ( 31 ,  32 ,  33 ,  34 ) providing for zero lift. 
     
     
         4 . The device for adjusting a motor vehicle valve drive according to  claim 3 , wherein another of the cam elements ( 11 ,  14 ) has at least one cam track ( 15 ,  16 ,  17 ,  18 ,  27 ,  28 ,  29 ,  30 ) providing for a valve lift and no zero lift cam track. 
     
     
         5 . The device for adjusting a motor vehicle valve drive according to  claim 1 , wherein of the first cam elements ( 11 ,  14 ) each has two cam tracks ( 15 ,  16 ,  17 ,  18 ,  27 ,  28 ,  29 ,  30 ) for activating an associated valve in each case, and of the second elements ( 12 ,  13 ) each has three cam tracks ( 19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  31 ,  32 ,  33 ,  34 ) for activating each an associated valve. 
     
     
         6 . The device for adjusting a motor vehicle valve drive according to  claim 1 , wherein the camshaft ( 10 ) includes two first and two second axially displaceable cam elements ( 11 ,  12 ,  13 ,  14 ), the two first cam elements ( 11 ,  14 ) in each case having two cam tracks for activating a valve, and the two second cam elements ( 12 ,  13 ) in each having three cam tracks for controlling activation of a valve. 
     
     
         7 . The device for adjusting a motor vehicle valve drive according to  claim 5 , wherein the second cam elements ( 12 ,  13 ), which have each three cam tracks ( 19 ,  20 ,  21 ,  22 ,  23 ,  24 ,  25 ,  26 ,  31 ,  32 ,  33 ,  34 ) for actuating the respective associated valves have each a zero lift cam track ( 32 ,  33 ). 
     
     
         8 . The device for adjusting a motor vehicle valve drive according to  claim 1 , wherein a control unit ( 35 ) which is provided for switching the at least the first and second cam elements ( 11 ,  12 ,  13 ,  14 ), independently of one another. 
     
     
         9 . The device for adjusting a motor vehicle valve drive according to  claim 8 , wherein the control unit ( 35 ) is provided for changing a switching position of at least one of the first and second cam elements ( 11 ,  14   i;    12 ,  13 ) while maintaining the momentary switching position of the other cam elements ( 11 ,  12 ,  13 ,  14 ) in at least one operating state. 
     
     
         10 . The device for adjusting a motor vehicle valve drive according to claim wherein, in at least one operating state, at least one of the cam elements ( 11 ,  12 ,  13 ,  14 ) has a cam track providing for a valve lift different from that of another of the cam elements ( 11 ,  12 ,  13 ,  14 ).