Rotary piston combustion engine

A combustion engine comprising:

• a stator (11) provided with a compartment (16, 116),
• a rotor (20) being mounted rotatable in a stator kinematism (60),
• a combustion pre-chamber (40, 41, 42, 43),
• an intake aperture (50) for delivering an air/air-fuel mixture, and
• an exhaust aperture (51),
• wherein said rotor (20) further comprises a first san axis of rotation (21) coaxial with said compartment (16, 116),
• wherein said first piston and said second piston (22, 23, 122, 123) further comprises:
• at least a peripheral surface (47) being articulated one with respect to the other,
• wherein said stator kinematism (60) are provided to coordinate cyclically the rotations of said first piston and said second piston (22, 23, 122, 123) around said axis of rotation (21) to synchronously accelerate or decelerate with respect to the other in the same direction and at the same average angular velocity,
• at least a first radial arm (22a, 23a, 22b, 23b, 122a, 122b) provided with a first lateral surface (45) orthogonal to the plane of rotation, cooperating cyclically with a corresponding second lateral surface (46), also orthogonal to the plane of rotation,
• a second adjacent radial arm (22a, 23a, 22b, 23b, 122a, 122b) and said at least the first radial arm (22a, 23a, 22b, 23b, 122a, 122b) defining a combustion chamber (31, 32, 33, 34), and
• wherein said first lateral surface (45) comprises a bevel (36, 37, 38, 39) oriented in a rotational direction, to define, with the second lateral surface (46) of the adjacent radial arm (22a, 23a, 22b, 23b, 122a, 122b), and
• wherein said combustion pre-chamber (40, 41, 42, 43) continuously cooperates with the combustion chamber (31, 32, 33, 34), and
• wherein said stator kinematism (60) comprises:
• at least a first pair of elliptical gears (65, 66), with a transmission ratio (RTi) which is variable within a complete revolution of the first pair of said elliptical gears at a ratio 1:3 to 3:1 in order to make said first piston and said second piston (22, 23, 122, 123) of said rotor (20) to accelerate or decelerate cyclically,
• wherein a first elliptical gear (65) of the first pair of said elliptical gears is keyed in to a first shaft (67) to which a first cylindrical gear (69) is also keyed,
• wherein said first cylindrical gear (69) engages a second cylindrical gear (70) that is keyed onto a second shaft (71),
• wherein said first and second cylindrical gears (69, 70) invert a rotational direction of said first shaft (67) with respect to said second shaft (71) which is connected to the first piston by a third shaft (72),
• wherein a transmission ratio between the third shaft (72) and the first piston (22, 122) being 2:1 so that the first pair of elliptical gears (65, 66) effects two complete rotations with every complete rotation of the first piston (22, 122) and a second piston (23, 123), and
• at least a second pair of elliptical gears (91, 92, 191, 192) associated with said first pair of said elliptical gears (65, 66),
• wherein at least one elliptical gear of said second pair of said elliptical gears is connected with an output shaft (99) of the engine, to rebalance a rotational speed of said first piston and said second piston to be continuous and proportionate to an average rotational speed of said first piston and said second piston (22, 23, 122, 123).