Continuous variable valve duration apparatus and engine provided with the same

An engine comprising:

• a camshaft mounted to a cylinder head;
• a plurality of wheels mounted to the camshaft, of which a wheel key is formed respectively, and disposed on each cylinder;
• a plurality of cam portions of which a cam and a cam key are formed respectively, of which the camshaft is inserted thereto;
• a plurality of inner brackets of which a first sliding pin hole and a second sliding pin hole connected with each wheel key and each cam key are formed thereto;
• a plurality of slider housings of which each inner bracket is rotatably inserted thereto, and disposed movable up and down direction of the engine;
• a guide shaft connecting the plurality of slider housings;
• a first pin of which a wheel key slot where the wheel key is slidably inserted thereto and rotatably inserted into the first sliding pin hole;
• a second pin of which a cam key slot where the cam key is slidably inserted thereto is formed opposite direction of the wheel key slot, and rotatably inserted into the second sliding pin hole;
• and
• a control portion configured for moving a position of the guide shaft for changing rotation centers of the plurality of the inner brackets.