Patent ID: 7380527

Claim:
An internal-combustion engine, the engine comprising: a first combustion chamber; a first piston displaceably guided in said first combustion chamber, said first piston facing said first combustion chamber with a first piston surface in a first direction; a second combustion chamber; a second piston displaceably guided in said second combustion chamber, said second piston facing said second combustion chamber with a second piston surface in a second direction, said first direction and said second direction being opposed to each other; means for coupling said first piston to said second piston such that they move simultaneously; means defining a first air chamber, said first air chamber being arranged on an opposite side of said first piston surface of said first piston, said first air chamber having a first air intake and being connected to said first combustion chamber via a first air channel; and means defining a second air chamber, said second air chamber disposed on an opposite side of said second piston surface of said second piston, said second air chamber having a second air intake and being connected to said second combustion chamber via a second air channel, wherein said first and second air chambers are delimited by walls of a crankcase as well as walls of cylinders, in which said first and second pistons are displaceably guided.