Continuous variable valve duration apparatus and engine provided with the continuous variable valve duration apparatus

A continuous variable valve duration apparatus comprising:

• a camshaft;
• a first and second cam portion, each including a cam and a cam key, where the camshaft is inserted into the first and second cam portions and where relative phase angles with respect to the camshaft are variable;
• a first and second inner bracket transmitting a rotation of the camshaft to the first and second cam portions respectively and on which a first and a second sliding hole are formed respectively;
• a first and second slider housing into which the first and second inner bracket are rotatably inserted, and where relative positions of the first and second slider housings with respect to the camshaft are variable;
• a cam cap rotatably supporting the first and second cam portions respectively and where each slider housing is slidably mounted to a cam cap;
• a slider pin rotatably inserted into the first sliding hole and slidably inserted into the camshaft;
• a cam pin on which a cam key slot for the cam key to be slidably inserted thereinto is formed and rotatably inserted into the second sliding hole;
• a control shaft disposed parallel to the camshaft and engaged with the first and second slider housings for selectively moving the first and second slider housings;
• and
• a control portion selectively rotating the control shaft for changing positions of the first and the second inner brackets.