42results about How to "Improve scavenging efficiency" patented technology

A free piston engine is configured with a pair of opposed engine cylinders located on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each operatively located in a respective one of the engine cylinders, with a push rod connected between the inner pistons. The push rod extends through an inner pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. An outer piston assembly includes a pair of pistons, one each operatively located in a respective one of the engine cylinders, with at least one pull rod connected between the outer pistons. The pull rod extends through an outer pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. Each outer piston cooperates with an integrated scavenge pump in order to compress the charge air, thus significantly increasing the air charge density into the engine cylinders for each stroke of the engine.

The invention discloses an oppositely-arranged four stroke free piston internal combustion-linear electricity generating integrated device. The oppositely-arranged four stroke free piston internal combustion-linear electricity generating integrated device comprises a four-stroke internal combustion engine, two linear motors, a reversible electric energy storing device, an electric power unit and an electronic control unit, wherein each linear motor has an electricity generating working mode and an electric working mode, the electric power unit is used for connecting the linear motors and the reversible electric energy storing device, the electronic control unit is respectively connected with a valve timing mechanism, an ignition device and the electric power unit of the four-stroke internal combustion engine, active cells of the linear motors are fixedly connected with two pistons of the internal combustion engine, the active cell of each linear motor is provided with a position detecting component which is connected with the electronic control unit, the two ends of a combustor cylinder of the four-stroke internal combustion engine are open, the two pistons are symmetrically arranged inside the combustor cylinder, and the two linear motors are symmetrically arranged inside the combustor cylinder. The oppositely-arranged four stroke free piston internal combustion-linear electricity generating integrated device is good in operation dynamic balanced performance and high in scavenging efficiency.

The invention discloses a low emission two-stroke gasoline engine, comprising a cylinder body, a piston, a cylinder cavity, a first half crankcase and a second half crankcase, and a crank chamber formed by the first half crankcase and the second half crankcase. The two-stroke gasoline engine is characterized in that scavenging air belts which communicates the crank chamber with the cylinder cavity are symmetrically arranged at the cylinder body, the scavenging air belts feature a closed type structure, and the closed type structure is realized by arranging end covers at the two sides of the cylinder body; gas partition walls are arranged at the scavenging air belts, the gas partition walls divide the scavenging air belts into a scavenging air belt 1 and a scavenging air belt 2 and the angle of the scavenging air belts is designed to be alpha; throttling holes are arranged at a cylinder body combination surface of the first half crankcase and the second half crankcase, and the throttling holes turn the gas flow in the lower reach of the scavenging air belts into impingiment flow, thus effectively reducing content of injurious ingredient (HC and NOx), improving initial discharge, effectively lowering fuel consumption rate of the gasoline engine, and improving economic performance.

The invention discloses a high-pressure exhaust gas recirculation (EGR) system of a vehicle engine and relates to an EGR system. The high-pressure EGR system of the vehicle engine passes through the engine, wherein the engine is provided with a gas inlet and a gas outlet and comprises a gas inlet pipeline, a gas outlet pipeline, an EGR pipeline and an electronic pressurizer. The gas inlet pipeline is arranged in front of the gas inlet. The gas outlet pipeline is arranged behind the gas outlet. The ERG pipeline is connected between the gas inlet and the gas outlet pipeline of the engine and used for conducting ERG on part of gas exhausted by the gas outlet pipeline and then sending the exhaust gas to the engine again. The electronic pressurizer is arranged on one side of the gas inlet pipeline through a pipe. The electronic pressurizer is arranged on the gas inlet pipeline of the high-pressure EGR system, so that parts are fewer, the application cost is low, and the arrangement difficulty is relatively low; and actuators needing to be controlled are fewer, so that calibration is easy to conduct, the oil-saving effect of the electric pressurizer and the high-pressure EGR technology which are applied to a pressurizing gasoline engine is improved, and application of the electric pressurizer and the high-pressure EGR technology to the pressurizing gasoline engine is promoted.

The invention discloses a high compression ratio two-stroke gasoline compression ignition device and a control method. The stroke length of an air cylinder of the device is 90mm-110mm; a fuel injector and an electric heating plug are separately mounted on the top of the air cylinder; five scavenging ducts are separately formed in the side wall of a crankcase; the lower port of each scavenging duct communicates with the crankcase and communicates with the gas cylinder; a scavenging duct valve is mounted at the lower port of the fifth scavenging duct; a gas inlet is formed in the side wall of the crankcase, and a gas inlet pipe communicates with the crankcase; a gas compressor, a gas inlet control valve, an intercooler and a reed valve are successively mounted on the gas inlet pipe along the gas inlet direction; one end of a gas inlet by-pass pipe is connected to a gas inlet pipe between a turbine motor and the intercooler while the other end is connected to a gas inlet pipe between the intercooler and the reed valve; and an exhaust recycling pipe communicates between the outlet port of an exhaust pipe and the inlet port of the gas inlet pipe. The power is improved, and the oil consumption and discharge are reduced.

The invention relates to a two-stroke gasoline engine cylinder. The cylinder comprises a cylinder body, a first side cover and a second side cover, wherein after the first side cover is matched with the cylinder body, one pure air storing chamber is formed; after the second side cover is matched with the cylinder body, another pure air storing chamber is formed; the cylinder body is provided witha pure air inlet, a mixer gas inlet, a scavenging port and an exhausting port; the installing flange positions, close to scavenging channels on the two sides, of the cylinder body are provided with aplurality of scavenging flow limiting holes; the structure of the scavenging flow limiting holes can limit the scavenging charge and increase the scavenging speed for mixed gas participating in scavenging, so that the mixed gas fast passes through the scavenging flow limiting holes to fast eject pure air in the pure air storing chambers into a combustion chamber, the charge of fresh gas in tail gas is faster occupied, and due to the fact that the tail gas exhausted out of the exhausting port of the cylinder body contains lots of fresh pure air, the content of THC and CO in the tail gas can begreatly lowered, and the purpose of energy saving and emission reducing is achieved.

The invention relates to a scavenging system of a constant-pressure air source type free piston internal combustion generator, and belongs to the technical field of power machinery. The scavenging system comprises a scavenging box, an air cylinder and a constant-pressure air source, wherein the air cylinder comprises an air cylinder sleeve, a cylinder body and an air cylinder cover; the air cylinder sleeve is fixedly connected with the cylinder body; one end of the cylinder body is tightly and fixedly connected with the air cylinder cover, and the other end of the cylinder body is fixedly connected with the scavenging box; a sealing material such as a pad is clamped between contact faces at two ends, so that a sealing effect is achieved; a first main scavenging port, a second main scavenging port and an auxiliary scavenging port of the scavenging box are correspondingly connected with a first main scavenging port, a second main scavenging port and an auxiliary scavenging port formed in the air cylinder sleeve respectively through a first main scavenging pipeline, a second main scavenging pipeline and an auxiliary scavenging pipeline of the cylinder body; an air blower of the constant-pressure air source is connected with an air inlet of an air storage tank; and an air outlet is connected with an air inlet of the scavenging box. When the constant-pressure air source is used, the air inlet pressure intensity is higher than that of external atmosphere pressure; a pressurization effect is achieved; and the scavenging system adopts special design, so that the scavenging efficiency is obviously improved.

The invention discloses an air cylinder sleeve for a two-stroke diesel engine and a processing method for the air cylinder sleeve. The air cylinder sleeve comprises a cylinder sleeve body, a water sleeve, a water inlet flange, a water separator and a connecting stud, wherein an inner hole of the cylinder sleeve body is divided into an upper straight-hole section, a middle drum-shaped hole sectionand a lower straight-hole section which communicate with one another from top bottom; the water sleeve comprises an upper water sleeve and a lower water sleeve, and are separately brazed on the cylinder sleeve body to form an upper cooling water cavity and a lower cooling water cavity; the water inlet flange is welded on the lower water sleeve; the water separator is assembled in the water inlet flange; and the connecting stud is arranged at the upper end of the cylinder sleeve body. The two-stroke diesel engine disclosed by the invention can improve friction wear performances of the cylindersleeve, improves scavenging efficiency, and improves the cylinder sleeve cooling effect, so that the service life is prolonged and energy consumption is reduced.

The invention discloses a crankshaft assembly. The crankshaft assembly comprises a crankshaft and a filler, wherein the filler is in interference connection with the crankshaft, so that the filler and the crankshaft are connected into a whole body. The filler is fixed to the crankshaft in an interference connection mode, so that the crankshaft assembly is simple and compact in structure, the number of assembled parts is reduced, the assembling efficiency is improved, the weight of the crankshaft assembly is reduced, the rotating inertia force of the crankshaft is reduced, and the production cost is saved; and the crankshaft assembly is installed on an engine, so that the overall mass of the engine is reduced, the lightweight design is realized, the scavenging efficiency of an engine cylinder body is improved, the performance of the engine is improved, the production cost is reduced, and the market competitiveness is improved.

The invention provides a scavenging boost structure of a two-stroke engine. The scavenging boost structure comprises a cylinder body assembly and a crankcase assembly. According to the structure, a crankcase scavenging flow limiting hole is designed in a crankcase scavenging channel, a cylinder body scavenging flow limiting hole is designed in a cylinder body scavenging channel, and the effectivearea of the crankcase scavenging flow limiting hole is larger than that of the cylinder body scavenging flow limiting hole. When the engine works normally, mixed gas in the crankcase enters the cylinder body scavenging channel after being boosted by the crankcase scavenging flow limiting hole and then boosted again under the action of the cylinder body scavenging flow limiting hole, the two structures interact, the gas flow speed can be greatly increased, the scavenging efficiency in gas cylinders can be enhanced, the atomization effect on fuel can be promoted substantially, and the combustionefficiency can be improved, so that discharge of THC and NOx in tail gas is greatly reduced; and scavenging flow limiting holes, cylinder bodies and a crankcase body are set as an integrated structure, the scavenging flow limiting holes can be implemented by mold structures, processing procedures are not added, and the manufacturability and practicability are better.

The invention discloses general technology of low emission and environmental protection for a small two-stroke gasoline engine. Three air inlets and an air exhaust are arranged in a cylinder body. A closed-type air-scavenging duct is communicated with an inner cavity of the cylinder body by means of two air-scavenging ports in a cylinder sleeve. The area sizes of the two air-scavenging ports are respectively one third and a quarter of the sectional area sizes of a first air-scavenging duct and a second air-scavenging duct so that the effect of saving air is achieved. Openings of the air-scavenging ports of the cylinder sleeve are machined to be oblique ports of certain angles such that air-scavenging angle Alpha is kept in the range between 120 degrees to 150 degrees. The general technology of low emission and environmental protection for the small two-stroke gasoline engine has following beneficial effects: pure air directly enters a combustion chamber for air-scavenging operation in advance, thereby lessening adverse impact when air-scavenging operation is performed by solely using combustible gas mixture; at the same time, combustion temperature of the cylinder is decreased so that full combustion is achieved; the use of the alloy cylinder sleeve helps to improve the effect of the closed-type air-scavenging duct; while airflow velocity is increased, atomization of fuels is prompted and air-scavenging efficiency is increased; and the application of the alloy cylinder sleeve also helps to enhance abrasion resistance, corrosion resistance and resistance to high temperature of the inner wall of the cylinder body such that service lifetime of a machine is substantially prolonged.

The invention provides a valve type air inlet two-stroke engine. An air inlet valve, a VVT, a roller rocker arm, a cam shaft, a hydraulic tappet, a spark plug and an oil sprayer are fixed to a cylinder cover; an intercooler is fixed in an intake manifold; an intake air filter is connected with an electronic supercharger, the electronic supercharger is connected with the intake manifold, the intake manifold is connected with a cylinder body, and an engine oil pump and a cylinder body exhaust passage are respectively fixed on the cylinder body; the lower edge of the cylinder body exhaust passage is flush with the top surface of a piston at a lower dead center position; a three-way catalyst is connected with the cylinder body exhaust passage in a pipeline form; and an intake valve, the spark plug, the oil sprayer, the piston, the cylinder cover and the surface of the cylinder body form a combustion chamber. Valve type air intake is used, a variable cam phase system is matched, a scavenging window is expanded, and scavenging efficiency is improved; a high-pressure in-cylinder direct injection system is used, the in-cylinder temperature is reduced, and the fuel oil atomization efficiency is improved; and pressure lubrication is used for replacing spray lubrication, HC emission is reduced, and emission of a four-stroke engine at the same level is realized.

The invention discloses a two-stroke diesel engine combustion system and a diesel engine comprising the two-stroke diesel engine combustion system, and belongs to the technical field of engines. The system comprises an air inlet channel, an air cylinder and a combustion chamber, at least one scavenging port is formed in the air inlet channel, and the different scavenging ports are communicated with the air cylinder at different inclination angles so as to conduct layered rotational flow scavenging in the air cylinder. According to the two-stroke diesel engine combustion system, the layered rotational flow scavenging mode is adopted, scavenging of different areas can be completed, meanwhile, a vortex structure in the combustion chamber can be achieved, a good combustion organization is achieved, and the oil consumption rate of the two-stroke diesel engine is reduced.

The invention provides a combustion structure and an engine with the same. The combustion structure comprises a cylinder body, and the cylinder body is provided with a combustion chamber and an air inlet channel communicating with the combustion chamber; the pre-combustion chamber is arranged on the cylinder body, and a first scavenging hole communicating with the air inlet channel is formed in the side wall of the pre-combustion chamber; the seat ring is arranged in the air inlet channel, the seat ring is connected with the pre-combustion chamber, and a second scavenging hole communicated with the first scavenging hole is formed in the seat ring; and the air inlet valve component is movably arranged in the seat ring so as to block or release the second scavenging hole, and the combustion structure solves the problem that the structure of the precombustion chamber with scavenging is complex.