55 results about "Two-stroke engine" patented technology

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.

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 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.

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 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 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 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 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.

A two-stroke engine comprises a first oiling system and a second oiling system. The first oiling system includes a low-pressure pump that distributes oil from a first oil tank to the two-stroke engine. The second oiling system includes a pump mechanically coupled to a crankshaft of the two-stroke engine, wherein the pump distributes oil from a second oil tank to an accessory at a pressure greater than the first oil pressure, wherein oil distributed to the accessory is returned to the second oil tank.

Disclosed are a dual fuel system for a large two-stroke turbocharged uniflow internal combustion engine capable of operating with a first fuel, which is fuel oil, and a second fuel, which is a liquid fuel different from the first fuel; a large two-stroke engine and a vessel equipped with the same; and a method for operating the large two-stroke engine. [Solution] A dual fuel system is provided that allows the second fuel system to be easily purged with an inert gas, by comprising a first fuel system for supplying the first fuel, a second fuel system 30 for supplying the second fuel, a purge system for discharging the second fuel, and bypass valves 34 and 35 for completely discharging the second fuel from the second fuel system 30 during purging.

The utility model discloses a two-stroke engine crankshaft balance shaft structure which comprises a crankshaft assembly and a balance shaft assembly, a driving gear used for driving the balance shaft assembly to rotate is arranged in the crankshaft assembly, and the balance shaft assembly comprises a rotating shaft. The driven gear is mounted at the end part of the rotating shaft, and the driven gear is meshed with the driving gear in the crankshaft assembly; the balance block is mounted at the end part of one end, far away from the driven gear, of the rotating shaft; the balancing weight is mounted on the side wall of the driven gear; the engine balance shaft assembly has the beneficial effects that the working effect of the balance shaft assembly can be ensured without arranging a plurality of balance blocks in the balance shaft assembly, so that the weight of the balance shaft assembly is reduced, and the weight of an engine is further reduced.

The utility model provides a kind of top-mounted air valve type positioning scavenging two-stroke engine, it is related to internal combustion engine, it solves the problem that the four-stroke of traditional top-mounted air valve type engine is improved to two-stroke working mode and it is difficult to clean exhaust gas, exhaust gas cannot be cleaned fully and quickly, leading to the problem of poor combustion efficiency and emission performance, technical scheme is: including body group, top-mounted air valve type valve mechanism, two-stroke working crankshaft connecting rod mechanism, air inlet bend setting air guide switch mechanism at the intersection of air inlet and air inlet valve mounting hole;Air guide switch mechanism is: air inlet valve stem is fixedly provided with air pipe, air pipe and air inlet valve head between setting air outlet;Utilize air pipe and reciprocate with air inlet valve stem and pass through air inlet bend to close air inlet;Utilize air pipe and reciprocate with air inlet valve stem and enter engine combustion chamber to connect air inlet;It is set position after entering engine combustion chamber by air inlet valve, and it is connected air inlet to carry out scavenging, exhaust gas is discharged, combustion efficiency and emission performance are greatly improved.

A two-stroke engine assembly has a two-stroke internal combustion engine (ICE) and an exhaust system fluidly connected to the ICE. The exhaust system has a tuned pipe and at least one catalytic converter. A bypass valve is provided to selectively bypass the at least one catalytic converter. A method for controlling a two-stroke engine assembly controls the ICE to bring the temperature of exhaust gases within an operating temperature range of the catalytic converter. Another method for controlling a two-stroke engine assembly uses a lambda sensor to control the air-fuel ratio in cylinders of the ICE.

The application discloses a large ship low-speed engine exhaust valve disc and a preparation method thereof. According to the working principle of a ship two-stroke engine, the working condition of an exhaust valve and the failure characteristics of the exhaust valve, the bottom surface of the new exhaust valve disc is designed with annular protrusions. The number of the annular protrusions is 1-5, the distance of the first annular protrusion from the center is 10-80 mm, the distance of the second annular protrusion from the center is 80-150 mm, the width d is 1-50 mm, and the height e is 1-8 mm. The annular protrusions on the bottom surface of the exhaust valve disc change the gas vortex direction in the cylinder, break the scouring and ablation of the vortex group on the bottom surface of the exhaust valve disc, and destroy the heat transmission along the bottom surface of the valve disc. Without changing the existing material, increasing the difficulty of heat treatment process and manufacturing cost, the service life of the large ship low-speed engine exhaust valve can be effectively prolonged, and the operation cost of the ship can be reduced.

To provide a two-stroke engine suitable for hybridization, as a power source for a working machine capable of achieving measures against exhaust emissions while maintaining a small size and light weight, and provide a series hybrid device for a working machine.SOLUTION: A two-stroke engine has a throttle motor (22) for driving a throttle valve (20), a fuel injection device (430) disposed in an intake system (18) including a crank chamber (420), and a control unit (24) for controlling the throttle motor (22) and the fuel injection device. The two-stroke engine is designed to achieve an engine rotation speed of 4,500 rpm to 7,000 rpm when the throttle valve (20) is fully open. The two-stroke engine is operated with the throttle fully open by the control unit (24), and a battery (8) is charged with electric power generated by a generator (6) using the two-stroke engine.SELECTED DRAWING: Figure 2

This application provides a method for collecting and analyzing oil samples from a two-stroke engine, relating to the field of engine oil sample collection and analysis technology. The method involves establishing a flushing space within the engine cylinder while maintaining a closed exhaust port. Fuel is then injected in a predetermined amount. While keeping the exhaust port closed, the engine crankshaft is rotated reciprocally to create a dynamic flushing flow within the cylinder, flushing the inner surface and removing wear particles and carbon deposits, thus obtaining a mixed oil sample. This method overcomes the bottleneck of obtaining effective analytical samples from two-stroke engines due to fuel consumption during combustion, enabling effective monitoring of the wear condition of this type of engine. Ferrographic analysis based on the collected mixed oil sample allows for timely understanding of internal carbon deposits and wear conditions, enabling maintenance measures to be taken before failures occur. It achieves effective assessment of the internal condition of various models of two-stroke engines without complex modifications to the engine structure, effectively improving their operational reliability and service life.

The invention relates to an electronic fuel injection system for controlling a two-stroke engine for a portable fire pump. The electronic fuel injection system comprises a fuel supply system, an air inlet system, an electronic control unit (ECU), a sensor group and an actuator group, the sensor group comprises an engine cylinder cover temperature sensor and an atmospheric pressure sensor; the actuator group comprises an oil sprayer; wherein the ECU is electrically connected with the sensor group and the actuator group, and is configured to execute the following control logics: a, on the basis of a signal of the engine cylinder cover temperature sensor, judging the starting state of a cold engine or a hot engine and controlling the starting fuel injection quantity; and b, based on a signal of the atmospheric pressure sensor, the operation fuel injection quantity of the fuel injector is adjusted. The system has the effects of accurate control, quick start, high plateau adaptability, energy conservation and emission reduction.

The invention relates to an engine, which belongs to the technical field of power devices, and comprises an engine body assembly, which comprises a left engine body, a middle engine body and a right engine body which are connected in sequence, a cylinder barrel is embedded in the left engine body and the right engine body, and a cylinder cover is hermetically assembled at the end of the cylinder barrel; the hole shaft piston assembly is installed in the machine body assembly, and an air inlet piston is in sliding sealing fit with the cylinder barrel; the lubricating assembly is integrated on the machine body assembly and provides a lubricating effect for the cylinder barrel and the hole shaft piston assembly; the air distribution assembly comprises a slope square shaft linked with a hole shaft body of the middle machine body and a rocker arm in driving fit with an air valve, and the exhaust stroke and the air suction stroke are completed while the compression stroke and the work stroke of the hole shaft piston assembly are completed. The opposed hole shaft type two-stroke engine provided by the invention has the characteristics of small size, light weight, small vibration, low noise, few parts and the like.