Opposed piston type engine

An opposed-piston engine comprising:

• a first engine unit including a first cylinder, a first piston which reciprocates inside the first cylinder, a first crankshaft which converts reciprocating motion of the first piston into rotating motion, a first connecting rod which connects the first piston to the first crankshaft in a movable manner, and a first valve which is arranged in the first cylinder;
• a second engine unit including a second cylinder which is separate from and opposed to the first cylinder, a second piston which reciprocates inside the second cylinder, a second crankshaft which converts reciprocating motion of the second piston into rotating motion, a second connecting rod which connects the second piston to the second crankshaft in a movable manner, and a second valve which is arranged in the second cylinder;
• a cylinder head disposed between the first engine unit and the second engine unit;
• a valve driving mechanism which drives the first valve and the second valve;
• and
• a crankshaft counter-rotation synchronization mechanism by which a rotation direction of the first crankshaft and a rotation direction of the second crankshaft are set opposite to each other,
• wherein the valve driving mechanism functions as the crankshaft counter-rotation synchronization mechanism, and
• wherein the cylinder head defines a first combustion chamber within the first cylinder and further defines a second combustion chamber within the second cylinder such that the first combustion chamber is separate from the second combustion chamber.