Abstract:
The invention provides an internal combustion engine comprising a piston mounted for reciprocating linear motion within a cylinder along a cylinder axis. The piston is coupled to an output shaft by a power transfer assembly arranged to convert linear motion of the piston to rotary motion of the output shaft. The piston has a first head moveable within a first chamber and a second head opposite the first head and moveable within a second chamber. The power transfer assembly has a lubrication system for lubricating moving components of the power transfer assembly. The lubrication system is sealed from the first chamber and the second chamber to prevent the passage of fluid from the lubrication system into the first chamber and the second chamber.
Abstract:
An internal combustion engine having a power cylinder (200), whereby the power, ventilation (comprising simultaneous intake and exhaust), and compression events within the power cylinder (200) completed define the cycle of the engine, with induction in the induction cylinder (100) being an auxiliary and incidental function to the cycle within the power cylinder (200), such that engine cooling and fuel efficiency are improved over prior art internal combustion engines. Interconnecting the power cylinder and the induction cylinder (100) is a transfer chamber which opens into the top of the power cylinder (200), which chamber in turn is equipped with a one way, pressure responsive transfer valve (60) for allowing air to flow into the power cylinder (200) when pressure therein falls below the pressure in the induction cylinder (100). An exhaust port (12) is likewise positioned near the bottom of the power cylinder (200).
Abstract:
A rotary engine (40a) includes a housing (76a) and elliptical rotors (44a) mounted to rotor shafts (54a, 54b) for rotation within a chamber (46a) of the housing (76a). A valve disk (200, 202) mounted to a rotor shaft includes a port (224, 240) passing between first and second sides. A valve plate (204) includes a bore (244, 246) defining a cylindrical sidewall for rotationally receiving the valve disk. The valve disk (200, 202) includes a groove (214, 232) disposed in a wall (216, 234), and includes a ring member (218) disposed in the groove that contacts the sidewall of the bore (244, 246) when the valve disk (200, 202) is disposed in the bore. The apparatus may include multiple valve disks disposed in separate bores to operate as exhaust or intake valves. Circumferential channels (288, 290) may be included in the bore sidewalls within which the ring members are disposed.
Abstract:
A multicylinder two-stroke cycle internal combustion engine (10) comprises an individual crankcase cavity (18) for each cylinder to receive the incoming air charge for that cylinder and a cylinder block (11) with at least two cylinders having co-operating crankcase cavities (18) provided with valve controlled intake ports (19) in a common wall (31) of the cylinder block (11). An air induction manifold (25) is detachably mounted to the common wall (31) to form a single air induction cavity (27), at least part of which is formed within the cylinder block (11), and has a single main inlet port for regulation of air inflow to the induction cavity (27). Individual passages (33) communicating each crankcase cavity inlet port (19) with the air induction cavity (27) are formed in the manifold (25). Acceptable performance with limited increase in the overall physical dimensions of the engine (10) can thus be obtained.
Abstract:
An improved exhaust port throttling mechanism for a two-stroke engine. The engine includes a plurality of in-line cylinders (2) each having an exhaust passage (5) disposed to be closed during reciprocating movement of the piston. The exhaust passages (5) communicate with a common exhaust chamber (6a, 6b) and a tubular valve member (10) is mounted for rotation within the exhaust chamber (6a, 6b). The valve member (10) includes a plurality of apertures (13), each adapted to register with one of the exhaust passages (5). When used with a V-6 engine having two banks of in-line cylinders (2), a shaft (12) is connected to each valve member (10) and the corresponding ends of the shafts are interconnected by meshing gear segments (15a-15b). One of the gear segments (15a) is connected through a linkage (27) to the throttle lever (28) for the engine (1) so that the valve members (10) will be rotated by actuation of the throttle lever (28) between a substantially closed position at low speeds, where the valve members (10) substantially close off the exhaust passages, to an open position at high speed where the apertures (13) in the valve members (10) are in full registery with the exhaust passages (5), so that the exhaust gas is discharged via the interior of the valve members (10) without restriction.
Abstract:
An idling system for a multi-cylinder two-stroke engine as used in an outboard motor. Through a porting arrangement in the carburetor of at least one of the cylinders, the fuel supplied to that cylinder at idle and off-idle speed is reduced to a value so that the fuel-air ratio is too lean to fire. On rapid acceleration from idle speed, a charge of fuel is injected directly to the non-firing cylinder to provide smooth acceleration.
Abstract:
A gas transfer port system for a cylinder of a two- stroke internal combustion engine; said cylinder provided with a fixed separator plate dividing said cylinder into an upper section and a lower section; a piston in said cylinder reciprocating between said separator plate and a cylinder head; and wherein an annular skirt descending from said separator plate forms at least a portion of an annular well between said skirt and an internal surface of said cylinder; said well sealed at the bottom such that said cylinder is isolated from a crankcase of said engine; said gas transfer port system including at least one long gas transfer port connecting a lower portion of said annular well with a gas transfer port outlet aperture in a wall of said cylinder.
Abstract:
A stepped piston engine comprises first (10), second (11) and third (12) stepped cylinders, each cylinder (10, 11, 12) having a larger diameter pumping part (10p, 11p, 12p), and a smaller diameter working part (10w, 11w, 12w), and a piston (13, 14, 15) slidable in the cylinder, each piston (13, 14, 15) being coupled to an output shaft (16) of the engine, first transfer passage means (20) to transfer the precompressed charge from the larger diameter pumping part (10p) of the first cylinder (10) to the smaller diameter working part (11w) of the second cylinder (11), second transfer passage means (21), to transfer precompressed charge from the larger diameter pumping part (11p) of the second cylinder (11) to the smaller diameter working part (124) of the third cylinder (12), and third transfer passage means (22) to transfer precompressed charge from the larger diameter pumping part (12p) of the third cylinder (12) to the smaller diameter working part (10w) of the first cylinder (10).
Abstract:
Process and device for supplying air to the cylinder of a two-stroke internal combustion engine, with at least one set of two cylinders arranged at 180 DEG , supercharged by a post-filling effect. Said device is characterized in that it comprises a volumetric pump defined by the natural movement of a piston between its top dead center and its bottom dead center and inversely, connected to intake air transit means (8A, 8B) for the air supply thereto. Advantageously the volumetric pump is formed by the pump casing of the cylinder which is in the scavenging phase. In a variant, this device comprises at least one transfer passage (30) intermittently connecting the transit means (8A, 8B) with the upstream pump casing (6B or 6A) associated therewith. The device of the invention provides, at all times, the required air supply and hence correct operation of the engine even at low loads or during start-up, and in an easy manner.
Abstract:
An exhaust port throttling mechanism for a two-stroke engine. The engine includes a plurality of in-line cylinders (2) each having exhaust port means (5) disposed to be closed during reciprocating movement of the piston. The engine block (1) is provided with a passage (9) which intersects each exhaust port means (5), and a shaft (10) is mounted for rotation within the passage and carries a plurality of butterfly-type valves (12) that are disposed to open and close each exhaust port means (5). When used with a V-6 engine, having two banks of in-line cylinders (2), a shaft (10) carrying the valves (12) is employed for each bank and the corresponding ends of the shafts (10) are interconnected by meshing gear segments (14a,b). One of the gear segments (14b) is connected through a linkage (27) to the throttle lever (28) for the engine, so that the valves (12) will be moved by actuation of the throttle lever (28) between a substantially closed position at low speeds to an open position at high speeds. A biasing mechanism (19) is incorporated with the gear segments (14a,b) to bias the valves (12) to a closed position, and an adjusting mechanism (22) can be incorporated to manually adjust the closed position of the valves (12).