Valve timing adjusting system

Abstract

A valve timing adjusting system 1 includes a first valve timing adjusting device 6 changing a relative rotational of an intake camshaft S 3 relative to a crank shaft S 1, and also a second valve timing adjusting device 7 having a first rotor 71 transmitting the rotatory driving force derived from the crank shaft S 1 to the device 6 via a chain 9 a, and a second rotor 72 secured on an exhaust camshaft S4 rotating synchronously with the crank shaft S 1.

What is claimed is:  
     
         1 . A valve timing adjusting system comprising: 
 a first valve timing adjusting device provided on an intake camshaft of an internal combustion engine, and changing a relative rotational position of the intake camshaft relative to a crank shaft of the internal combustion engine; and    a second valve timing adjusting device having a first rotor transmitting rotatory driving force derived from the crank shaft to the first valve timing adjusting device, and having a second rotor secured on an exhaust camshaft rotating synchronously with the crank shaft.    
     
     
         2 . The valve timing adjusting system according to  claim 1 , wherein the rotation regulating position of the first valve timing adjusting device is set at the most advanced position, and the rotation regulating position of the second valve timing adjusting device is set at the most lagged position.  
     
     
         3 . A valve timing adjusting system comprising: 
 a first valve timing adjusting device provided on an intake camshaft of an internal combustion engine, and changing a relative rotational position of an intake camshaft relative to a crank shaft of an internal combustion engine; and    a second valve timing adjusting device having a first rotor rotating synchronously with the crank shaft, and a second rotor secured on an exhaust camshaft of the internal combustion engine.    
     
     
         4 . The valve timing adjusting system according to  claim 3 , wherein the rotation regulating position of the first valve timing adjusting device is set at the most advanced position, and the rotation regulating position of the second valve timing adjusting device is set at the most lagged position.  
     
     
         5 . A valve timing adjusting system comprising: 
 a first valve timing adjusting device provided on an intake camshaft of an internal combustion engine, and changing a relative rotational angle of an intake camshaft relative to a crank shaft of the internal combustion engine;    a second valve timing adjusting device provided on an exhaust camshaft of the internal combustion engine, and changing the relative rotational angle of the exhaust camshaft relative to the crank shaft; and    a third valve timing adjusting device provided on the crank shaft side;    wherein the third valve timing adjusting device is provided in series in the direction of the driving transmission relative to the first valve timing adjusting device and the second valve timing adjusting device.    
     
     
         6 . The valve timing adjusting system according to  claim 5 , wherein among the plurality of valve timing adjusting devices provided in series, two are set at different rotation regulating positions, respectively.  
     
     
         7 . The valve timing adjusting system according to  claim 6 , wherein among the two valve timing adjusting devices provided in series, one is set at the most advanced position, and the other is set at the most lagged position.  
     
     
         8 . The valve timing adjusting system according to  claim 7 , wherein both of the two valve timing adjusting devices provided in series are of the vane type.  
     
     
         9 . The valve timing adjusting system according to  claim 7 , wherein among the two valve timing adjusting devices provided in series, one is of the vane type, and the other is of the helical type.  
     
     
         10 . The valve timing adjusting system according to  claim 9 , wherein the valve timing adjusting device whose rotation regulating position is set at the most advanced position is of the helical type, and the valve timing adjusting device whose rotation regulating position is set at the most lagged position is of the vane type.  
     
     
         11 . The valve timing adjusting system according to  claim 5 , wherein the one valve timing adjusting device whose rotation regulating position is set at the most advanced position is provided in series relative to the two valve timing adjusting devices whose rotation regulating positions are set at the most lagged position, respectively.  
     
     
         12 . The valve timing adjusting system according to  claim 11 , wherein the one valve timing adjusting device whose rotation regulating position is set at the most advanced position is coaxially connected directly with the crank shaft of the internal combustion engine.  
     
     
         13 . The valve timing adjusting system according to  claim 7 , wherein two valve timing adjusting devices provided in series are made in combination of the vane type and the electric-powered type.