Asymmetric transfer and intake in two-strokes
OwnerManousos Pattakos, Efthimios Pattakos +2inventors
InventorsManousos Pattakos, Efthimios Pattakos, Paraskevi Pattakou, Emmanouel Pattakos
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Abstract
With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”.
Claims19
A reciprocating piston two-stroke engine comprising at least:
- a crankcase (1);
- a crankshaft (2), the crankshaft being rotatably mounted in the crankcase (1), the crankshaft having a crankpin (3);
- a cylinder (4);
- a piston (5) slidably fitted in the cylinder (4);
- a combustion chamber (6) defined by the piston (5) and the cylinder (4), the piston (5) is comprising a piston crown (15) separating the combustion chamber (6) from a space (17) within the piston;
- a connecting rod (7) rotatably mounted on the crankpin (3) and pivotally mounted, by a wrist pin (9), on the piston (5) so that a rotation of the crankshaft (2) causes a reciprocation of the piston (5) in the cylinder (4) between a top dead center piston position and a bottom dead center piston position;
- a transfer control surface (8) on the connecting rod (7);
- a transfer port (10) on the cylinder (4);
- a transfer control port (11) on the piston (5),
- for a portion of a reciprocation of the piston (5) the transfer port (10) is communicating with the combustion chamber (6) while the space (17) within the piston is communicating through the transfer control port (11) with the transfer port (10),
- for a portion of a reciprocation of the piston (5) the transfer port (10) is communicating with the combustion chamber (6) while the transfer control surface (8) on the connecting rod (7) is sealing the transfer control port (11) not allowing the communication of the space (17) within the piston, through the transfer control port (11), with the transfer port (10) and the combustion chamber (6),
- so that an asymmetric transfer is realized wherein the communication of the combustion chamber (6) with the space (17) within the piston is substantially asymmetrical relative to a displacement of the piston before and after the bottom dead center piston position.
A reciprocating piston two-stroke engine comprising at least:
- a crankcase (1);
- a crankshaft (2), the crankshaft being rotatably mounted in the crankcase (1), the crankshaft having a crankpin (3);
- a cylinder (4);
- a piston (5) slidably fitted in the cylinder (4);
- a combustion chamber (6) defined by the piston (5) and the cylinder (4);
- a connecting rod (7) rotatably mounted on the crankpin (3) and pivotally mounted, by a wrist pin (9), on the piston (5) so that a rotation of the crankshaft (2) causes a reciprocation of the piston (5) in the cylinder (4) between a top dead center piston position and a bottom dead center piston position;
- an intake control surface (22) on the connecting rod (7);
- an inlet port (21) on the cylinder (4);
- an intake control port (24) on the piston (5),
- for a portion of a reciprocation of the piston (5) the crankcase (1) is communicating, through the intake control port (24), with the inlet port (21),
- for a portion of a reciprocation of the piston (5) the intake control surface (22) on the connecting rod (7) is sealing the intake control port (24) not allowing the communication of the crankcase (1) with the inlet port (21) through the intake control port (24),
- so that an asymmetric intake is realized wherein the communication of the crankcase (1) with the inlet port (21) is substantially asymmetrical relative to a displacement of the piston before and after the top dead center piston position.
Dependencies are inferred from the claim text.