Patent ID: 7658172

Claim:
A valve unit of an internal combustion engine, which is accommodated in a space between a cylinder head of the internal combustion engine and a rocker cover of the internal combustion engine, comprising a camshaft provided with a cam for each cylinder; a variable valve operating mechanism for receiving a displacement of the cam, outputting a valve drive output, and continuously variable-controlling the valve drive output in accordance with a rotational displacement of a control shaft provided substantially in parallel with the camshaft; a sensor for detecting the rotational displacement of the control shaft; and a retaining member for retaining the camshaft, the variable valve operating mechanism, and the sensor, and exposing the sensor to the outside of the rocker cover thereby to fix the camshaft, the variable valve operating mechanism, and the sensor to the cylinder head, wherein the sensor for detecting the rotational displacement is arranged at an axial end of the control shaft, and the other end of the control shaft is coupled to an actuator mechanism for rotationally displacing the control shaft.