Continuous variable valve duration apparatus and engine provided with the same

An engine comprising:

• a camshaft;
• at least two of a first cam portion and a second cam portion of which two cams are formed thereto respectively, of which the camshaft is inserted thereto, of which relative phase angles with respect to the camshaft are variable, disposed on one cylinder and the next cylinder respectively, and of which a cam cap engaging portion is formed between the cams respectively;
• first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively;
• at least two of slider housings of which the first and second inner brackets are rotatably inserted thereto, of which relative positions with respect to the camshaft is variable and of which a guide protruded portion is formed to an upper side thereof respectively;
• at least four of cam caps of which each cam cap engaging portion is rotatably connected thereto;
• connecting brackets connecting the cam caps and of which a guide slot for the guide protruded portion to be inserted thereto for guiding movement of the slider housing is formed thereto respectively;
• and
• a control portion selectively changing a position of the slider housing,
• wherein a first sliding hole and a second sliding hole are formed to the first and second inner brackets respectively;
• wherein a slider pin inserted into the camshaft is rotatably inserted into the first sliding hole respectively;
• wherein a cam key is formed to the first and second cam portions respectively;
• and
• wherein a cam pin of which a cam key slot for the cam key to be slidably inserted thereto is formed thereto is slidably inserted into the second sliding hole respectively.