Variable valve mechanism

A variable valve mechanism of an internal combustion engine, comprising:

• a rotary cam that rotates according to rotation of the internal combustion engine;
• an output arm that is swingably provided, and that drives a valve when swinging;
• an input member that is provided so as to be swingable relative to the output arm, and that contacts the rotary cam;
• and
• a switching device that switches between a coupled state where the input member is coupled to the output arm so as not to allow the input member to swing relative to the output arm, and a non-coupled state where the coupling between the input member and the output arm is released so as to allow the input member to swing relative to the output arm, wherein
• the variable valve mechanism changes a drive state of the valve by the switching operation,
• the input member comprises an annular input roller that contacts the rotary cam, and a swing pin that is inserted into the input roller so as to rotatably support the input roller and that swings relative to the output arm when in the non-coupled state, and
• a center of the relative swinging movement is located at a position different from a rotation center of the input roller which is located inward of the input roller.