Continuous variable valve duration apparatus and engine provided with the same

An engine comprising:

• a camshaft;
• a plurality of wheels mounted to the camshaft, of which a wheel key is formed thereto respectively, and disposed corresponding to each cylinder;
• a plurality of cam portions of which a cam and a cam key are formed thereto respectively, of which the camshaft is inserted thereto, of which relative phase angle with respect to the camshaft is variable and disposed corresponding to the each cylinder;
• 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 respectively thereto;
• a plurality of slider housings of which each inner bracket is rotatably inserted thereto, and movable up and down direction of the engine;
• first pins of which a wheel key slot, each wheel key is slidably inserted thereto, is formed thereto respectively and rotatably inserted into the first sliding pin hole;
• second pins of which a cam key slot, the each the cam key is slidably inserted thereto, is formed thereto opposite to the wheel key slot respectively, and rotatably inserted into the second sliding pin hole;
• a control portion selectively moving the slider housings to adjust relative position of a rotation center of the inner brackets;
• and
• a guider guiding movement of the sliding housings.