Rotary piston internal combustion engine

An internal combustion engine (1), the internal combustion engine (1) comprising:

• an engine housing (5) having a first wall (10) delimiting a first combustion chamber (11) and a second wall (15) delimiting a second combustion chamber (16) with the first and second walls (10, 15) each defining at least a section of a torus;
• a first piston (20) having a first piston head (21A) further delimiting said first combustion chamber (11), a second piston head (21B) further delimiting said second combustion chamber (16), a first pivot arm (22A) coupled to a first connecting rod (25), and a second pivot arm (22B) coupled to a common pivot point (30);
• a second piston (35) having a third piston head (36A) further delimiting said first combustion chamber (11), a fourth piston head (36B) further delimiting said second combustion chamber (16), a third pivot arm (37A) coupled to a second connecting rod (40), and a fourth pivot arm (37B) coupled to said common pivot point (30);
• a first crankshaft (45) coupled to said first connecting rod (25), and a second crankshaft (50) coupled to said second connecting rod (40);
• wherein said first and second pistons (20, 35) are guided along a curved path defined by said common pivot point (30);
• wherein said first and second pistons (20, 35) move in opposite directions;
• wherein said second pivot arm (22B) of said first piston (20) and said fourth pivot arm (37B) of said second piston (35) oscillate about said common pivot point (30);
• and
• wherein said first crankshaft (45) and said second crankshaft (50) are located outside a region defined by extension of the curved path in directions perpendicular to a first plane bisecting the curved path, and wherein the first crankshaft (45) and second crankshaft (50) are located on opposite sides of a second plane bisecting the first combustion chamber (11) and the second combustion chamber (16), wherein the first plane and the second plane intersect at a right angle.