Abstract:
A valve device of an engine, wherein an opening part (7) smaller in area than the end surface of a piston (5) is provided in the end surface of a cylinder (3) so as to form a valve seat (8), and a valve disc (9) in contact with the valve seat (8) is disposed on the outerside of the valve seat (8) so that the cylinder (3) can be moved away from and toward the valve disc (9) and, in a compression stroke when the piston (5) rises, the valve seat (8) is in press-contact with the fixed valve disc (9) because an upward force is applied to the upper end surface of the cylinder (3) and the cylinder (3) is urged toward the valve disc, whereby an engine high in emission efficiency can be obtained because a highly airtight valve device can be obtained with a simple structure, and the area of the opening part can be increased up to the ultimate diameter of the piston.
Abstract:
The invention aims at providing higher efficiency and good exhaust gas performance. To this end, a fresh gas is compressed in a first cylinder chamber (1) having a first piston (3) during successive compression strokes and compressed in one of at least two combustion chambers (9), in which combustion of a mixture consisting of the compressed fresh gas and an at least partially evaporated fuel is started after said combustion chamber has been closed in relation to the first combustion chamber. Subsequently, the combustion chamber (9) is opened relative to a second cylinder chamber (2) and a second piston in the second cylinder chamber is impinged upon by the combustion gases expanding from the combustion chamber (9) to perform a working cycle. After said working cycle has been completed, the exhaust gases are expelled from the second cylinder chamber (2).
Abstract:
A piston machine including: a crankshaft; a cylinder defining an internal chamber; a piston positioned in the chamber, the piston being connected to the crankshaft and being configured to reciprocate inside the chamber; a head attached to the cylinder and closing the chamber at an end opposing the piston. The head includes at least one port group including ports for allowing fluid communication between the chamber and a respective manifold; and for each port group, a valve arrangement coupled to the head, each valve arrangement including, a valve for operatively controlling fluid flow through the respective port and a bridge coupled to the valves, wherein movement of the bridge relative to the head causes synchronised operation of the valves; and, an actuator for causing the bridge to move based on the reciprocation of the piston.
Abstract:
A valve actuation system for an internal combustion engine is disclosed. The engine has a first set of cylinders having a first set of exhaust valves and a second set of cylinders having a second set of exhaust valves. The valve actuation system for the exhaust valves includes one or more first cams having a compression-release lobe and a main exhaust lobe adapted to transfer valve actuation motion to the first set of exhaust valves, and one or more second cams having an early exhaust valve opening (EEVO) lobe and a main exhaust lobe adapted to transfer valve actuation motion to the second set of exhaust valves. The valve actuation system may provide any combination of (i) main exhaust valve actuation with or without compression release actuation with (ii) main exhaust valve actuation with or without EEVO for the two sets of cylinders.
Abstract:
A 2-cycle engine has: a piston reciprocably housed in a cylinder bore; an intake opening, an exhaust opening, and a scavenge opening provided in an inner peripheral wall of the cylinder bore and opened/closed by the piston; and a scavenge passage connecting the scavenge opening and a crank chamber. A valve that opens/closes the scavenge passage is provided on the scavenge passage.
Abstract:
An internal combustion engine having a single piston (1) dual chamber (18, 19) arrangement wherein at least one chamber (18) is a combustion chamber. A connecting rod (3) is rigidly coupled to the piston (1) and passing out of a chamber (19) to be coupled to a linear to rotary motion converter.
Abstract:
Este motor emplea una corona dentada y planetario que permiten fijar la biela en un punto cuya trayectoria es recta, convirtiendo su movimiento en translación. Al no inclinarse, desaparece el rozamiento pistón-cilindro. El movimiento del pistón senoidal puro, se equilibra completamente. Baja más lentamente que en los motores tradicionales, mejorando la combustión. La biela se sustituye por dos piezas roscadas que permiten variar su tamaño atornillándolas con una unión estriada, modificando el PMS y compresión. Esta particularidad, y la ausencia de rozamientos, son óptimos para realizar un ciclo asimétrico Atkinson disminuyendo la carrera efectiva de admisión: Se utiliza una válvula rotativa con desfase variable, en serie con otra habitual con apertura retardada, minimizando las pérdidas de carga. Estas características (mejora de la combustión, eliminación de rozamientos, ciclo simétrico, relación de compresión optimizada) garantizan eficiencias competitivas con las configuraciones híbridas.