Device for adjusting the timing of valves and internal combustion engine having such a device

Abstract

A device for adjusting the timing of valves is provided with a driven camshaft ( 1 ) comprising two groups of radial cams with at least one radial cam ( 4, 6 ) each for controlling valves. The circumferential positions of the radial cams ( 4 ) on the camshaft of the first group is adjustable in reference to the circumferential positions of the radial cams ( 6 ) on the camshaft of the second group. For this purpose, the device is provided with a wobble plate mechanism ( 14 ) having two rotary bodies ( 2, 10 ) with a common rotational axis, connected to one another in a form-fitting manner by way of a wobble-plate ( 13 ). The first rotary body is connected to the first group of radial cams ( 4 ) and the second rotary body is connected to the second group of radial cams ( 6 ). Additionally, an internal combustion engine is provided, comprising two camshafts, each with a wobble plate mechanism and two groups of radial cams for adjusting the timing of valves. This results in a very flexible adjustment of the timing of valves.

1 . Device for adjusting the timing of valves having at least one driven camshaft ( 1 ), comprising 
 a wobble plate mechanism ( 14 ) having two rotary bodies ( 2 ,  10 ) connected to one another in a form-fitting fashion, the camshaft ( 1 ) is provided with two groups of radial cams ( 4 ,  6 ) each having at least one radial cam, with the camshaft—circumferential positions of the radial cams ( 4 ) of the first group being relatively adjustable in reference to the camshaft—circumferential positions of the radial cams ( 6 ) of the second group,    the first rotary body ( 2 ) being connected to the first group of radial cams ( 4 ), and    the second rotary body ( 10 ) being connected to the second group of radial cams ( 6 ).    
   
   
       2 . Device according to  claim 1 , wherein the camshaft ( 1 ) comprises: 
 an exterior hollow shaft ( 2 ), which carries the radial cams ( 4 ) of the first group and is connected in a torque proof manner to one of the rotary bodies ( 2 ), and    an interior shaft ( 3 ), which is arranged coaxially in reference to the exterior hollow shaft ( 2 ) and rotatable in reference thereto, to which the radial cams ( 6 ) of the second group are connected, the interior shaft is connected to the other rotary body ( 10 ) in a torque proof manner, and    penetrating apertures ( 7 ) being provided in the exterior hollow shaft ( 2 ) for the radial cams ( 6 ) of the second group.    
   
   
       3 . Device according to  claim 1 , wherein the radial cams ( 4 ) of one of the two groups is connected to one of the valve timing gears in a torque proof manner.  
   
   
       4 . Device according to  claim 1 , wherein at least one of the two rotary bodies ( 2 ,  10 ) is provided with a circular line of action ( 9 ) for the form-fitting engagement by a wobble plate ( 13 ) of the wobble plate mechanism  
   
   
       5 . Device according to  claim 4 , wherein the wobble plate mechanism ( 14 ) has two concentrically nested circular lines of action ( 9 ,  11 ) for a form-fitting engagement of the wobble plate ( 13 ).  
   
   
       6 . Device according to  claim 1 , wherein the camshaft ( 1 ) operates at least one intake valve via at least one intake valve radial cam ( 4 ) assigned to one of the two groups, and operates at least one exhaust valve via at least one exhaust valve radial cam ( 6 ) assigned to the other group.  
   
   
       7 . Device according to  claim 6 , wherein an additional camshaft ( 1 ) is provided that operates at least one intake valve via at least one of the intake valve radial cams ( 4 ) assigned to one of the two groups, and operates at least one additional intake valve via at least one additional intake valve radial cam ( 6 ) assigned to the other group.  
   
   
       8 . Device according to  claim 1 , wherein the at least one camshaft ( 1 ) operates at least one exhaust valve via at least one of the exhaust valve radial cams ( 4 ) assigned to one of the two groups, and operates at least one additional exhaust valve via at least one additional exhaust valve radial cams ( 6 ) assigned to the other group.  
   
   
       9 . An internal combustion engine having a device for controlling valves, comprising one camshaft ( 1 ) including at least one intake valve radial cam and another camshaft including at least one exhaust valve radial cam, wobble-plate mechanisms ( 14 ) having two rotary bodies ( 2 ,  10 ) being allocated to each of the camshafts ( 1 ), respectively, and cooperating with two groups of radial cams ( 4 ,  6 ) of the respective camshafts, the radial cams ( 4 ) of the first group being relatively adjustable in reference to the camshaft—circumferential positions of the radial cams ( 6 ) of the second group on each of the camshafts, the first rotary body ( 2 ) of each of the respective wobble plate mechanisms being connected to the first group of radial cams ( 4 ) of each of the camshafts, and the second rotary body ( 10 ) of each of the respective wobble plate mechanisms being connected to the second group of radial cams ( 6 ) of each of the camshafts.  
   
   
       10 . Internal combustion engine according to  claim 9 , wherein the two groups comprise at least one radial cam ( 4 ,  6 ) per control valve of each cylinder.  
   
   
       11 . The device according to  claim 4 , wherein the at least one of the two rotary bodies ( 2 ,  10 ) is a rotation plate ( 10 ) with one engaging wall ( 11 ) being allocated in the circular line of action ( 9 ).