73 results about "Two-stroke engine" patented technology

The present invention relates to the technical field of two-stroke engines, and discloses a multi-cylinder ignition type air-injection two-stroke direct injection multi-fuel design structure, which includes a fuel system, an intake system and a mixed rail air-injection system. The multi-cylinder ignition type air-injection two-stroke direct injection multi-fuel design structure has the following characteristics: intake boosting technology: using an air compressor to achieve intake boosting, thereby improving engine performance; air-assisted boosting technology: using an air compressor to achieve in-rail auxiliary boosting, thereby increasing the degree of mixing of fuel and air and improving engine performance; air-injection cylinder direct injection technology: the atomized particle diameter of the existing high-pressure common rail technology is about 10-15 microns. Through the air-injection technology, the mixed particles of fuel and air are more thoroughly atomized, and the diameter of diesel can be made to 5-8 microns, thereby realizing ignition type cylinder direct injection; and multi-fuel driving technology: it is easier to ignite low-ignition-point fuels, thereby achieving full combustion in different oil environments such as gasoline, kerosene, diesel, and alcohol gasoline.

The invention provides a cylinder oil composition suitable for a methanol fuel ship and a preparation method of the cylinder oil composition, and particularly relates to the technical field of lubricating oil. The cylinder oil composition suitable for the methanol fuel ship comprises the following components in percentage by mass: 5.0%-20% of a clearing agent, 1.0%-8.0% of an ashless dispersant, 0.5%-1.5% of a composite antioxidant, 0.5%-3% of an anti-wear agent, 0.01%-1% of a metal deactivator and the balance of base oil, the detergent is composed of high-base-number synthetic calcium sulfonate, low-base-number synthetic calcium sulfonate, high-base-number calcium boride sulfonate and high-base-number sulfurized calcium alkyl phenolate. According to the cylinder oil composition for the methanol fuel ship, the scheme of the purification dispersant is optimized, and a plurality of components such as the metal deactivator are introduced for combination, so that the obtained cylinder oil composition for the methanol fuel ship improves the wear resistance and the corrosion resistance of an oil product when the oil product is polluted by methanol and formic acid, and can meet the performance requirements when a marine two-stroke engine uses methanol fuel.

The utility model provides an overhead valve guide air inlet type two-stroke engine which solves the problems that waste gas cannot be fully swept away due to the fact that a four-stroke working mode of a traditional overhead valve type engine is improved into a two-stroke working mode, and combustion efficiency and emission performance are poor. According to the technical scheme, the overhead valve guide air inlet type two-stroke engine comprises an engine body set and an air distribution mechanism provided with an overhead valve, an air guide pipe moving along with an air inlet valve rod through a support sleeve is arranged on the air inlet valve rod of the air distribution mechanism, the air guide pipe is close to the head of the air inlet valve, and a front end air outlet is reserved between the front end of the air guide pipe and the head of the air inlet valve. The rear port of the gas-guide tube communicates with the gas inlet channel; an air inlet cam of the air distribution mechanism is provided with an air inlet cam protruding part which pushes the front end of an air guide pipe of an air inlet valve to stretch into an inner cavity of the air cylinder body. By guiding and scavenging the inlet air, the engine can go deep into the cylinder body to purge the combusted waste gas, open the exhaust valve to work and fully sweep the waste gas, so that the scavenging efficiency is greatly improved, and the combustion efficiency and the emission performance are improved.

A two-stroke engine assembly includes an engine including an engine block; at least one cylinder formed by the engine block, a cylinder volume being defined by the at least one cylinder; a crankshaft disposed in the engine block; at least one piston disposed in the at least one cylinder; and a protrusion extending into the cylinder volume, the protrusion defining a lubrication groove therein, the lubrication groove being disposed between the crankshaft and the at least one piston; and a lubrication system providing oil to the engine, the lubrication groove being shaped and arranged to collect oil droplets pushed by air toward the at least one piston during operation and to redirect the oil droplets to at least one pre-determined location in the at least one cylinder.

The invention relates to an exhaust gas system (6) comprising a two-stroke engine (16), wherein the exhaust gas system (6) has an exhaust gas line (13) and at least two catalyst support bodies (2, 3), the exhaust gas line (13) forms a concentric region (10) with an inner central channel (15) and with a concentrically outer circumferential channel (5), a first catalyst support body (2) is situated in the inner central channel (15) and a second catalyst support body (3) is situated in the concentrically outer circumferential channel (5), and the exhaust gas system (6) and the catalyst support bodies (2, 3) are configured such that exhaust gas coming from the two-stroke engine (16) at a flow speed flows through the at least two catalyst support bodies (2, 3) one after the other as the dwell time increases.

The invention relates to a carburettor and to a two-stroke engine with a carburettor, the carburettor having a carburettor body in which an air intake channel section is configured. A throttle flap for controlling the free flow cross-section of the air intake channel section is pivotably supported in the carburettor body on a throttle shaft. The air intake channel section has a first longitudinal centre axis in the region of the throttle shaft. The throttle flap has a first end position and a second end position, in which the throttle flap releases a greater flow cross-section of the air intake channel section than in the first end position. Arranged upstream of the throttle shaft is a partition wall section, against which the throttle flap lies in the second end position. Upstream of the partition wall section is provided a choke flap, which can be pivoted between a first end position and a second end position. The throttle flap and the choke flap overlap in the direction of the first longitudinal centre axis in their second end positions. The carburettor is provided for a two-stroke engine.

The invention relates to the technical field of internal combustion engines, and discloses a two-stroke engine circulating lubrication system which comprises a crankshaft mechanism, an air cylinder, a piston piece, an oil duct and a sealing device, oil rings are arranged on the upper side and the lower side of a cylinder of the piston piece respectively, a circumferential oil duct is arranged between the two oil rings, and the piston piece slides on the wall of the air cylinder. The two oil rings are attached to the inner wall of the air cylinder to form a closed space, an oil inlet hole and an oil outlet hole are formed in the inner wall of the air cylinder and movably communicated with the oil channel on the periphery of the piston, the crankshaft mechanism comprises a connecting rod and a piston pin, and oil channels are formed in the crankshaft, the connecting rod and the piston pin. A first sealing device 9 and a second sealing device 11 are arranged at the two ends of the connecting rod to form a closed oil channel. The closed circulating lubricating system enables lubricating oil and mixed gas to be completely separated, the lubricating oil does not participate in combustion any more, an oil film wraps moving parts all the time, and the lubricating effect is better.

The invention relates to a divisional application of which the application number is 202510973180. X. The invention discloses a two-stroke engine, and belongs to the technical field of engines. The two-stroke engine comprises a cylinder body and a piston, the cylinder body is provided with an air inlet, an air outlet and a scavenging channel, the hole wall of a combustion chamber is provided with a pair of first scavenging ports, a pair of second scavenging ports and a pair of third scavenging ports, and the air blowing elevation angles of the first scavenging ports, the second scavenging ports and the third scavenging ports are sequentially reduced. And the pressure applying device is used for applying gas pressure deviating from the exhaust port to scavenging gas generated by the scavenging port which is opened later to scavenging gas generated by the scavenging port which is opened first. According to the two-stroke engine, by means of the gradient change of the blowing elevation angles of the three pairs of scavenging ports, the combustible mixed gas is stabilized through scavenging airflow with the smaller elevation angle step by step, the situation that cyclone is formed and mixed with waste gas is prevented, effective separation of the scavenging gas and the combustion waste gas is achieved, the fuel oil utilization rate of the two-stroke engine is increased, tail gas emission is improved, and the service life of the two-stroke engine is prolonged. And the effects of energy conservation and emission reduction are achieved.

A dual fuel system for a large two-stroke turbocharged uniflow internal combustion crosshead engine capable of operating with a first fuel and a second, different fuel, the first fuel being fuel oil, the second fuel being fuel oil, the first fuel being fuel oil, the second fuel being fuel oil, the second fuel being fuel oil, the first fuel being fuel oil, and the second fuel being fuel oil, and a marine vessel having the same, and a method of operating the engine are disclosed. The second fuel is a liquid fuel. The dual fuel system includes: a first fuel system for supplying a first fuel; a second fuel system (30) for supplying a second fuel; a purge system for discharging a second fuel; and the bypass system is used for ensuring that the second fuel from the second fuel system is completely discharged during purging.

The invention provides an exhaust gas recirculation system device of a two-stroke engine, which is characterized in that a piston skirt is provided with an opening for forming an air flow channel between the inside of a crankcase and an exhaust silencer under a specific engine running state, and the exhaust silencer is communicated with the crankcase to ensure that the exhaust silencer is communicated with the crankcase in the air suction process of the engine; the exhaust gas exhausted by the adjacent cylinder can be guided into the crankcase; in the engine air suction stage, negative pressure is formed in the crankcase through ascending of the piston, an air inlet valve is opened, fresh air, fuel and waste gas are led into the crankcase to form mixed gas, and the waste gas in the mixed gas participates in the engine combustion period. By means of the technical scheme, the problems that in the prior art, a two-stroke engine is high in fuel consumption rate and poor in economical efficiency, and the combustion stability of an aviation kerosene engine is greatly affected by the cylinder temperature can be effectively solved.

A two-stroke engine (1) has a cylinder (2) in which a piston (5) is mounted to move reciprocally. The piston (5) defines a combustion chamber (3) formed in the cylinder (2). The piston (5) drives a crankshaft (7) rotatably mounted in a crankcase (4). The two-stroke engine (1) comprises an intake port (9) which opens into a crankcase interior (14) via an intake port opening (10), and an air port (11) which opens into a cylinder bore (13) of the cylinder (2) via at least one air port opening (12). The two-stroke engine (1) comprises at least one transfer port (17, 18) which opens into the cylinder bore (13) via at least one transfer port (19, 20) and fluidically connects the crankcase interior (14) to the combustion chamber (3) in the region of the bottom dead center (BDC) of the piston (5).The piston (5) has at least one piston pocket (16) that connects the at least one air duct opening (12) at least in a region of the piston's (5's) top dead center (TDC) with the at least one transfer port (19, 20). A fuel supply device (15) is provided for supplying fuel to the intake port (9). To ensure a sufficient fuel supply, the at least one piston pocket (16) has at least one section (23) designed and arranged such that, during the downward stroke of the piston (5), a fluidic connection exists between the at least one piston pocket (16) and the at least one air duct opening (12) up to a crankshaft angle (α) of at least 40° before bottom dead center (BDC).

This invention provides a special lubricating oil for multi-fuel spark-ignition two-stroke engines used in unmanned aerial vehicles (UAVs) and its preparation method, belonging to the field of lubricating oil technology. The special lubricating oil for multi-fuel spark-ignition two-stroke engines for UAVs comprises, by weight percentage: base oil, 66-81 wt%; additives, 15-20 wt%; and diluent, 4-14 wt%. The base oil includes hydrocarbon-based oil, polyisobutylene, and synthetic esters, wherein the hydrocarbon-based oil is a mixture of 70-85 wt% Group III hydrogenated mineral oil and 15-30 wt% Group IV hydrocarbon synthetic oil. The additives include a composite detergent-dispersant, a composite anti-adhesion detergent, a friction-reducing and anti-wear agent, an antioxidant, an octane number improver, and a compounding agent, wherein the octane number improver is N-methylaniline. The diluent is aviation kerosene.

A two-stroke engine has a cylinder in which a piston is mounted in a reciprocating manner. The piston delimits a combustion chamber in the cylinder. An air channel leads out at a cylinder bore of the cylinder via a channel opening. A transfer channel leads out at the cylinder bore via a transfer window and fluidically connects the crankcase interior to the combustion chamber in the region of the bottom dead center of the piston. The piston has a piston pocket connecting the air channel opening to the transfer window at least in the region of the top dead center. To ensure a sufficient fuel supply, the piston pocket has at least one section configured and arranged such that, during the downward stroke, a fluidic connection between the piston pocket and the air channel opening exists down to a crankshaft angle of at least 40° before bottom dead center.

The invention relates to the technical field of aero-engines, in particular to a two-stroke engine piston for aviation, a combustion chamber structure and application. The engine piston comprises a piston body, the upper surface of the piston body is of an outwards-protruding structure with the middle higher than the edge, and a catalysis part is arranged on the upper surface of the piston body; the combustion chamber structure comprises a combustion chamber body, the interior of the combustion chamber body is of an asymmetric structure, the combustion chamber body is defined by a cylinder body, a cylinder cover and a piston, the piston is slidably connected into the cylinder body, and the piston is arranged in the cylinder cover. The ignition position of the spark plug is located in the middle of the combustion chamber body when the piston moves to the upper dead center. By implementing the scheme, the combustion efficiency of the engine under the low-load condition is improved, and carbon deposition generated in the combustion chamber is reduced.

The invention provides an oil sample collection and analysis method for a two-stroke engine, and relates to the technical field of engine oil sample collection and analysis. A flushing space is built in an engine cylinder, an exhaust port is kept in a closed state, and then fuel is injected according to a first preset amount; under the condition that the exhaust port is kept closed, the engine crankshaft is rotated in a reciprocating mode to enable fuel to form dynamic flushing flow in the air cylinder, so that the inner surface is flushed, abrasion particles and carbon deposits attached to the inner surface are eluted, and a mixed oil sample is obtained; the method breaks through the bottleneck that effective analysis samples of the two-stroke engine cannot be obtained due to the fact that fuel is consumed along with combustion, and effective monitoring of the abrasion state of the engine is achieved; ferrographic analysis is carried out based on the collected mixed oil sample, and internal carbon deposition and wear states are grasped in time, so that maintenance measures are taken before a fault occurs; the internal states of the two-stroke engines of various models can be effectively evaluated without complex modification of the engine structure, the operation reliability is effectively improved, and the service life of the two-stroke engines is effectively prolonged.

The present invention relates to the technical field of opposed two-stroke engines, and discloses a cylinder liner for an opposed-piston two-stroke engine with a variable airflow organization form. The liner comprises a main cylinder liner and an intake-end cylinder liner that are mutually sleeved and connected. The main cylinder liner comprises a mating end near the intake port and a fixed end near the exhaust port. The sidewall of the mating end near the intake port is provided with a plurality of inner intake ports, and the sidewall of the fixed end near the exhaust port is provided with a plurality of exhaust ports. The intake-end cylinder liner comprises an extended fixed end and a mating end. The mating end of the intake-end cylinder liner has n layers of external intake ports of different configurations distributed axially, where n is greater than or equal to 2. The internal intake ports correspond to the external intake ports of different configurations, thereby changing the airflow organization form of the cylinder liner. The present invention can change the intake angle, solving the problem of a single airflow organization form within the cylinder and difficulty in making appropriate adjustments based on actual conditions.

The application relates to a variable exhaust two-stroke industrial engine, belonging to the technical field of internal combustion engines; the engine comprises an engine main body, an exhaust assembly and an air intake control unit; the air intake control unit is composed of a reed valve, an air cleaner, an electronic control unit and a dry reed; the reed valve is hinged through an adjustable pin shaft, and a closed-loop feedback control loop is formed by combining non-contact detection of the dry reed; the electronic control unit dynamically adjusts the opening angle and frequency of the reed valve through a fuzzy algorithm based on a rotating speed signal and a throttle opening degree, so that scavenging efficiency is optimized; a rotatable baffle driven by a stepping motor is arranged in a three-way catalytic assembly of the exhaust assembly, the opening degree of the rotatable baffle is linked with an air intake signal, and dynamic matching of exhaust back pressure and catalytic temperature is realized. The application solves the problems of fatigue of a reed valve of a traditional two-stroke engine, low catalytic efficiency and excessive emission, and significantly improves combustion efficiency and environmental protection performance.

A large engine, in particular a marine engine or a power plant engine, and a method of lubricating the engine using spray injectors, in particular SIP injectors. According to the method, a controller is provided which is configured to vary and control the pressure in the lubricant supply conduit within a desired pressure range, and the desired pressure depends on a measurement of the engine load and the actual pressure in the lubricant supply conduit.

A muffler for a two-stroke engine exhaust system. The silencer (10) comprises an exhaust inlet (21) and an exhaust outlet (22), and two exhaust flow paths (30) are arranged between the exhaust inlet (21) and the exhaust outlet. The exhaust gas flow path (30) comprises two adjacent flow channels (31), where two of the adjacent flow channels (31) are fluidly connected in series such that exhaust gas can flow from one flow channel to the other along the exhaust gas flow path (30). The adjacent flow channels (31) are configured for fluid flow in opposite directions therealong. A bypass channel (40) is arranged between the two adjacent flow channels (31) and used for balancing further communication between the two flow channels and promoting fluid pressure balance in the two channels (31).

A two-stroke engine includes a cylinder having an intake port, a piston configured to open and close the intake port by reciprocating in the cylinder, a crankcase connected to the cylinder and including a crank chamber, a crank assembly located in the crank chamber, a connecting rod having a first end connected to the piston and a second end connected to the crank assembly, and a fuel injector attached to the crankcase and configured to inject mixed fuel to the second end.

A two-stroke engine includes a cylinder with a cylinder bore. A crankshaft is mounted in a crankcase so as to be rotatable about a rotational axis. An intake channel over at least part of its length is divided into at least one mixture and at least one air channel. When viewed in a direction parallel to the rotational axis of the crankshaft, the mixture and the air channel downstream of a fuel supply unit are, at least over one section, curved. The mixture channel, when viewed parallel to the rotational axis of the crankshaft, downstream of the fuel supply unit to a spacing of 5 mm from the bore runs exclusively straight or performs a right-hand bend. The air channel, when viewed in the same direction, downstream of the fuel supply unit up to a spacing of 5 mm from the bore runs exclusively straight or performs a left-hand bend.

The invention discloses a two-stroke engine air pump assembly integration and auxiliary scavenging and lubricating device, and belongs to the technical field of internal combustion engines. The engine comprises an engine body and an air pump assembly, the air pump assembly is installed on one side of the engine body, and a first crankshaft on the engine body and a second crankshaft on the air pump assembly coincide in center line and are connected through a connecting piece. One first crankcase on the engine is communicated with a second crankcase on the air pump assembly, a first crankshaft on the engine is located in the first crankcase, and a second crankshaft on the air pump assembly is located in the second crankcase. Compared with the prior art, a belt pulley, a belt and a tensioning device used for driving the air pump are omitted, and the mode that the first crankshaft and the second crankshaft are connected is adopted, so that the structure is simple, and reliability is high; according to the design, through airflow movement between the second crankcase and the first crankcase, the ventilation quality of the engine can be improved, and the auxiliary lubrication effect on the second crankshaft friction pair can be achieved.

Recreational vehicle two-stroke engine control systems configured for location-based modification of an engine calibration may include a locator device, a throttle position sensor, and an engine speed sensor communicatively coupled to an engine control unit. The engine control unit controls a position of an exhaust valve based on a first calibration map and an input from the sensors. The engine control unit also determines, based on a location of the vehicle, a second calibration map. The engine control unit controls a position of an exhaust valve based on a second calibration map and an input from the sensors. Controlling the two-stroke engine to operate the exhaust valve at the second exhaust valve position may improve the engine run-quality, performance, efficiency, or the like.

The invention belongs to the technical field of engines, and particularly discloses an engine cylinder block structure and an operation method thereof, an engine and a vehicle, the engine cylinder block structure comprises a first cylinder and a second cylinder, a first piston is slidably connected in the first cylinder in the axial direction, and a second piston is slidably connected in the second cylinder in the axial direction; the driving assembly is used for driving the first piston and the second piston to slide; the first cylinder is provided with a sealable first air inlet hole and a sealable first air outlet hole, the second cylinder is provided with a sealable second air inlet hole and a sealable second air outlet hole, and the device further comprises a communicating assembly used for communicating the first air outlet hole with the second air inlet hole; the volume of the first cylinder is larger than that of the second cylinder. By the adoption of the scheme, the advantages of a two-stroke engine and a four-stroke engine can be integrated, the variable compression ratio is achieved, the homogeneous compression ignition acting mode of the engine is achieved, and the heat efficiency and acting efficiency of the engine are improved.

The invention discloses a two-stroke engine scavenging system and a two-stroke engine, and belongs to the technical field of engines. The two-stroke engine scavenging system comprises a cylinder body and a piston, the cylinder body is provided with an air inlet, an air outlet and a scavenging channel, the hole wall of a combustion chamber is provided with a pair of first scavenging ports, a pair of second scavenging ports and a pair of third scavenging ports, and the heights of the upper edges of the first scavenging ports, the second scavenging ports and the third scavenging ports are sequentially reduced. And the top surface of the piston is provided with a concave cavity which is sunken downwards. The gradient change of the upper edge height and the blowing elevation angle of the three pairs of scavenging ports is utilized, the design of the collecting groove in the top face of the piston is combined, orderly driving of combustion waste gas is achieved, effective separation of scavenging gas and the combustion waste gas is achieved in combination with the blowing elevation angle change, the collecting groove in the top face of the piston is utilized for containing combustible mixed gas, and the combustion efficiency is improved. The fuel oil utilization rate of the two-stroke engine is increased, tail gas emission is improved, and the effects of energy conservation and emission reduction are achieved.

The invention relates to spacecraft, aircraft, and ground-effect vehicles, and provides improvements to their engines, propulsion systems, and the machine recommended for machining the toroidal pistons of these engines. The engine shown is a two-stroke engine with free toroidal pistons whose explosions are stopped and expelled rearward; this engine, which, like the rocket, can propel in any medium, will very likely consume 1000 times less fuel than the rocket. The propulsion systems will allow reaching the speed of light, the engines escape velocity. It is probable that they will make it possible to reach habitable planets, which we have a 50 / 50 chance of finding within 24 light-years, and to build orbital power plants transmitting solar energy to Earth.

A combustion abnormality monitoring device for a two-stroke engine includes: a detection unit configured to detect combustion abnormality that is in-cylinder combustion triggered at a timing different from the timing of ignition; and a control unit configured to control the condition inside the cylinder when the detection unit detects combustion abnormality.