Variable valve system

A variable valve mechanism for use in a V-type internal combustion engine comprising:

• a first camshaft and a second camshaft, which are respectively positioned in a first bank and in a second bank to drive valve bodies of the same type;
• a first variable valve mechanism and a second variable valve mechanism, which are respectively positioned in the first bank and the second bank so as to satisfy a relationship of a mirror arrangement and transmit a pushing pressure to the valve bodies in the banks in accordance with the rotation of the first camshaft or the second camshaft;
• and
• a camshaft drive mechanism for rotating the first camshaft and the second camshaft in opposite directions and at a speed that is synchronized with the speed of a crankshaft,
• wherein each of the first variable valve mechanism and the second variable valve mechanism includes a mechanism for changing an operating angle of the valve body and a valve opening phase of the valve body in accordance with the status of a control shaft, and a control shaft drive mechanism for controlling the status of the control shaft;
• and
• wherein the control shaft drive mechanism included in the first variable valve mechanism and the control shaft drive mechanism included in the second variable valve mechanism control the associated control shafts symmetrically.