Adjustment device for adjusting the relative rotational angle position of a camshaft in relation to a crankshaft of an internal combustion engine

Abstract

An adjustment device ( 1 ) for adjusting the relative rotational angle position of a camshaft ( 2 ) in relation to a crankshaft of an internal combustion engine is provided, with the device having an adjustment mechanism ( 3 ), which is embodied as a triple-shaft transmission and provided with an input part ( 4 ) fixed to the crankshaft, an output part fixed to the camshaft, and an adjusting shaft ( 7 ) connected to an adjusting motor shaft ( 5 ) of an adjusting motor ( 6 ). The motor ( 6 ) is provided as an electric motor and is spatially separated from the adjusting shaft ( 7 ), and the torque produced thereby is transmitted to the adjusting shaft ( 7 ), either mechanically via a flexible shaft ( 8 ), pneumatically via a compressor ( 9 ) operating a pneumatic motor ( 13 ) using pressurized air, or hydraulically via a hydraulic motor ( 16 ) and a pump ( 14 ) providing the hydraulic medium. The adjusting motor ( 6 ) can also be arranged parallel to the adjusting shaft ( 7 ) or radially in relation thereto, and the torque is transmitted by toothed gearing or a secondary drive.

1 . Adjustment device ( 1 ) for adjusting the relative rotational angle position of a camshaft ( 2 ) in relation to a crankshaft of an internal combustion engine, the device comprising an adjustment mechanism ( 3 ), which is provided as a triple-shaft transmission and which has an input part ( 4 ) fixed to the crankshaft, an output part fixed to the camshaft, and an adjustment shaft ( 7 ) connected to an adjustment motor shaft ( 5 ) of an adjustment motor ( 6 ), wherein the adjustment motor ( 6 ) comprises an electric motor and is placed spatially separated from the adjustment shaft ( 7 ) and an adjustment torque generated by the motor is transmitted mechanically by a flexible shaft ( 8 ) to the adjustment shaft ( 7 ).  
   
   
       2 . Adjustment device ( 1 ) for adjusting the relative rotational angle position of a camshaft ( 2 ) in relation to a crankshaft of an internal combustion engine, the device comprising an adjustment mechanism ( 3 ), which is provided as a triple-shaft transmission and which has an input part ( 4 ) fixed to the crankshaft, an output part fixed to the camshaft, and an adjustment shaft ( 7 ) connected to an adjustment motor shaft ( 5 ) of an adjustment motor ( 6 ), wherein the adjustment mechanism ( 3 ) is driven with a pneumatic motor ( 13 ), wherein a compressor ( 9 ) driven by an electric motor ( 6 ) supplies compressed air required for the pneumatic motor.  
   
   
       3 . Device according to  claim 2 , wherein a directional control valve ( 12 ) that controls a rotational direction of the pneumatic motor ( 13 ) is arranged between the compressor ( 9 ) and the pneumatic motor ( 13 ).  
   
   
       4 . Device according to  claim 3 , wherein a non-return valve ( 11 ) is arranged between the compressor ( 9 ) and the directional control valve ( 12 ).  
   
   
       5 . Device according to  claim 4 , wherein a pressurize reservoir ( 10 ) is arranged between the direction control valve ( 12 ) and the non-return valve ( 11 ).  
   
   
       6 . Adjustment device ( 1 ) for adjusting the relative rotational angle position of a camshaft ( 2 ) in relation to a crankshaft of an internal combustion engine, the device comprising an adjustment mechanism ( 3 ), which is provided as a triple-shaft transmission and which has an input part ( 4 ) fixed to the crankshaft, an output part fixed to the camshaft, and an adjustment shaft ( 7 ) connected to an adjustment motor shaft ( 5 ) of an adjustment motor ( 6 ), wherein the adjustment mechanism ( 3 ) is driven with a hydraulic motor ( 16 ), and a pump ( 14 ) that supplies hydraulic fluid required for the hydraulic motor is driven by an electric motor ( 6 ).  
   
   
       7 . Device according to  claim 6 , wherein a direction control valve ( 12 ″) that controls a rotational direction of the hydraulic motor is arranged between the pump ( 14 ) and the hydraulic motor ( 16 ).  
   
   
       8 . Device according to  claim 7 , wherein a non-return valve ( 11 ″) is arranged between the pump ( 14 ) and the directional control valve ( 12 ″).  
   
   
       9 . Device according to  claim 8 , wherein a pressurized hydraulic accumulator ( 15 ) is arranged between the directional control valve ( 12 ″) and the non-return valve ( 11 ″).  
   
   
       10 . Adjustment device ( 1 ) for adjusting the relative rotational angle position of a camshaft ( 2 ) in relation to a crankshaft of an internal combustion engine, the device comprising an adjustment mechanism ( 3 ), which is embodied as a triple-shaft transmission and which has an input part ( 4 ) fixed to the crankshaft, an output part fixed to the camshaft, and an adjustment shaft ( 7 ) connected to an adjustment motor shaft ( 5 ) of an adjustment motor ( 6 ), wherein the adjustment motor ( 6 ) comprises an electric motor and is arranged radially relative to the camshaft ( 2 ).  
   
   
       11 . Device according to  claim 10 , wherein a toothed gear ( 17 ) is arranged between the electric motor and the camshaft, wherein an adjustment torque generated by the electric motor is transmitted mechanically via the toothed gear ( 17 ) to the adjustment shaft ( 7 ).  
   
   
       12 . Device according to  claim 11 , wherein the toothed gear ( 17 ) comprises a bevel gear pair, a worm gear pair, or a spiral gear pair.  
   
   
       13 . Device according to  claim 11 , wherein the transmission ratio of the toothed gear is 1:1.  
   
   
       14 . Adjustment device ( 1 ) for adjusting the relative rotational angle position of a camshaft ( 2 ) in relation to a crankshaft of an internal combustion engine, the device comprising an adjustment mechanism ( 3 ), which is provided as a triple-shaft transmission and which has an input part ( 4 ) fixed to the crankshaft, an output part fixed to the camshaft, and an adjustment shaft ( 7 ) connected to an adjustment motor shaft ( 5 ) of an adjustment motor ( 6 ), wherein the adjustment motor ( 6 ) comprises an electric motor and is arranged parallel to the camshaft ( 2 ) and an adjustment torque generated by the motor is transmitted via a secondary drive ( 18 ) to the adjustment shaft ( 7 ).  
   
   
       15 . Device according to  claim 14 , wherein the secondary drive ( 18 ) comprises a belt drive, a chain drive, a cardan drive, or an additional spur gear stage.