Two-stroke internal combustion engine

 

The invention relates to two-stroke crankcase of the internal combustion engine with scavenging, in which in the upper part of the transmission channels is added to fresh air for use as a buffer in relation to the mixture of the air/fuel below. The technical result consists in the possibility of creating engine with reduced fuel consumption and reduced allocation of combustion products with this design is that the height of the engine does not lead to any difficulties when using the engine manual engine tools. The engine 1 includes a cylinder 2 with the inlet pipe 10 to a mixture of air/fuel and with a number of transmission channels 20. With the inlet pipe 10 is connected to the carburetor 12. The engine also includes a nozzle 24 for supplying air, which is at least partially located below the carburetor 12 and may be connected to the cylinder 2 below the inlet pipe 10. The pipe 24 for supplying air supplied restrictive valve 25, which may be located both above and below the carburetor. Between the nozzle 24 for supplying air and the upper part of the transfer channels 20 formed opened by the piston of the air channel 23, 22, 26, 21. 6 C.p. f-crystals, 1 Il.

Background of invention

In engines of the above type nozzle for supplying air to the cylinder is usually connected through a restrictive valve with an air filter of the engine. Restrictive valve for regulating intake air into the transfer channels by changing one or more parameters of the engine. Below the pipe for the supply of the air intake pipe of the cylinder is connected with the carburetor, a pipe for supplying air through the air filter side from the specified bounding valve.

Preferably, to prevent the increase of the height of the engine, to Orient the inlet pipe if possible, oriented in a horizontal direction. However, on the positive mixture when idling will be from the cylinder to flow back into the carburetor, resulting in an uneven way, or, perhaps, stop the engine.

These requirements orientation of the inlet piping coupled with the fact that the carburetors of the prior art often stretched essentially vertically in relation to the diameter of the inlet pipe, lead pipe for supplying air above the inlet pipe, ultimately, is the engine is relatively high. This creates problems, especially in cases where the engine is used in hand tools, such as chain saws or in machines for straightening of herbs, because it can be inconvenient and impractical design. In addition, in the case of the high position of the nozzle for the air supply air supply, cooling the cylinder is limited, leading to poor engine cooling.

To minimize these disadvantages, the inlet pipe is usually directed horizontally as possible without the risk of stopping the engine, but this orientation is not optimal.

Brief description of the invention

The present invention is to solve the above problems and creating a two-stroke crankcase of the engine by blowing with such design tools.

This problem is solved by means of the engine of the above type according to the invention, in which a pipe for supplying air at least partially passes below the carburetor. As for proper system of holes of the piston connecting holes for fresh air inside the cylinder have a predetermined space above the inlet, then this means that a branch pipe for supplying air intersects with the inlet pipe, for example, through education of the outer ducts, such as hoses or pipes between the cylinder and the pipe for supplying air, which is located below the carburetor.

Often on each side of the cylinder has at least one connection opening, and through ducts that pass by the inlet pipe, the connecting holes can be connected to a common pipe for supplying air.

Therefore, such arrangement of the nozzle for the supply of air is completely reverse to the known construction of the engine and creates a number of advantages.

First, design the entire engine becomes more compact due to more optimal use of space at the side of the cylinder.

Secondly, the air is forced prot is those which provide a more favorable direction of the flow in the engine.

Thirdly, the cooling air can get better access to the cylinder, since the outlet for the air supply is at a greater distance from the cooling fins. The fact that the entire air filter can be located at a greater distance from the cylinder, which also improves the flow into the cooling air.

In addition, in accordance with a particularly preferred embodiment, the pipe for supplying air is connected to the cylinder in the inlet opening below the inlet pipe. This is an advantage, because the requirement for coupling the inlet pipe is completely eliminated, resulting in the location and orientation of the inlet pipe, you can choose more freely. With this design you can also eliminate the requirement of passing external air ducts past the inlet pipe, and to produce a more compact and saves space solution. At the same time the flow of air through the pipe for the air supply improves and eliminates the need for a strong bending of the pipe for the supply of air.

Preferably, the inlet pipe was oriented obliquely upwards in the direction of the cylinder, and preferably, the carburetor was RA the more space the pipe for the supply of air below the carburetor. In addition, the inflowing stream of the mixture of air/fuel is forced to flow directly down into the crankcase, thereby lubricating the bearing of the connecting rod.

The pipe for the supply of air may be partially outside of the carburetor, so that the restrictive valve which is usually located at the end of the pipe for the supply of air will be essentially in the combination with a pipe for supplying air to the carburetor. This design makes it possible to use straight studs filter between the carb and the filter, which reduces the throttling of the air and to improve supply to the engine.

Thanks to the chosen orientation of the inlet pipe and carb restrictive valve may be located above the carburetor or on the same level. However, it can also be located obliquely above or obliquely below the carburetor. In the case of a shared air filter this relationship will affect the orientation of the air filter, which will be optimally coordinated with the neighboring parts.

Brief description of drawings

Below the object of the present invention will be described in more detail with reference to the accompanying drawing, only one figure which, for example, illustrates a basic circuit Donoho option exercise

Two-stroke crankcase of the internal combustion engine with scavenging, shown in the figure, generally denoted by reference number 1 and contains a cylinder 2, which is mounted on the crankcase 3. Candle 5 ignition is placed in the Chuck 4 on the outer side of the cylinder. In the cylinder is a piston 6, is attached to the rod 1. In the figure the piston and the connecting rod is partially removed to more clearly show other parts of the engine. Denoted by reference number 8 of the fuel tank shown only schematically to illustrate its location relative to the engine 1 manual motor tool, such as a chain saw. Obviously, the cylinder also has an outlet for exhaust gases, coupled with a silencer, which for simplicity is not shown.

The following description relates primarily to the parts that relate to the subject matter of the invention. Other parts of the engine and its overall function can be considered to be well known to the specialist, so that detailed description is not necessary.

It should be noted that the orientation of the engine according to the present description is usually such that the crankcase is directed downwards, and the spark plug up. Normally should not exist ka is as limiting object of the invention, which is more related to the design and arrangement of the individual parts of the engine.

The cylinder 2 is equipped with an inlet pipe 10, in which the cylinder passes into the inlet hole 11. Through the inlet pipe of the cylinder is supplied with a mixture of air/fuel from the carburetor 12. To be able to relatively easily positioned respectively between the carburetor 12 and the intake pipe 10 is intermediate connecting pipe 13. In addition, the carburetor has a nozzle 14 for supplying air, which is made with the possibility of bleed air from the air filter 15.

In addition, the cylinder 2 has one or more transmission channels, or vent channels 20, each of which has a vent window 21 which leads into the cylinder. Vent channels can be located in the usual way along the radius outward from the cylinder or, as shown in the figure, can be sent on tangents from the inlet ports 21. Vent channels 20 connect the inlet ports with the crankcase 3.

Near each inlet ports 21 and slightly lower along the wall of the cylinder is the connecting hole 22 for fresh air. Each connecting hole 22 through the connecting channel 23 with the operation time of the engine 1, which here is not to be described in more detail, the connecting holes 22 will be connected to the purge Windows 21 through the hole in the piston. This recess is shown in the figure by the dashed square 26. As a result of this fresh air will flow to the vent channels 20 through pipe 24 for supplying air.

The pipe 24 for supplying air departs from the space below the inlet pipe 10 at a distance from the cylinder 2, i.e., below the carburetor 12. Then, as shown in the figure, the pipe for supplying air deviates somewhat upward, so that the restrictive valve 25 is positioned obliquely, and passes below and in the direction of the pipe 14 for supplying air to the carburetor 12. However, the shape of the nozzle 24 for supplying air broken, to indicate for example only the location of the bounding valve 25. Can be used as a shorter and a longer pipe 24 for supplying air, while limiting valve 25 can be located either directly under the carburetor, or completely outside of the carburetor 12 (to the right in the figure), or even above the carburetor 12.

The carburetor 12 and the outlet 14 for the supply of air is shown in the figure located in the direction of producbon 14 for the supply of air can be carried out in any other way, which further indicated in the figure by wavy lines.

Because the pipe 14 for supplying air to the carburetor and restrictive valve 25 is normally connected to the air filter 15, the design of the engine depends on these details. The solution shown in the figure, leads to relatively straight channels for air through the carburetor 12 and through the pipe 24 for supplying air, and an inclined orientation General of the air filter 15. In relation to the operating conditions of the engine is surrounded by other structures, other possible ways of implementing more optimum, and the pipe 24 for supplying air does not have to be connected with an air filter 15.

As you can see from the example, the connecting channels 23 can be made in advance at the casting of the cylinder and are connected to a common outer hole 27 located below the inlet pipe 10.

However, they can also be made in the form of pipes or hoses running between the connecting holes 22 and pipe 24 for supplying air, with the formation of a corner connection of any kind.

Summarizing, it can be noted that the above description of a variant implementation of the invention shall only be regarded as when the>ormula inventions

1. Two-stroke engine crankcase (1) internal combustion purge containing the cylinder (2) with an inlet pipe (10) for a mixture of air/fuel and a number of transmission channels (20), respectively (12) connected to the inlet pipe (10) and the nozzle (24) for supplying air, equipped with a restrictive valve (25), whereby between the nozzle (24) for the supply of air and the upper part of the transmission channel (20) is formed opened by the piston of the air channel(23, 22, 26, 21), notable the nozzle (24) for supplying air, at least partially, passes below the carburetor (12).

2. The engine under item 1, characterized in that the nozzle (24) for supplying air is connected to the cylinder (2) below the inlet pipe (10).

3. The engine under item 1 or 2, characterized in that the inlet pipe (10) is oriented obliquely upwards in the direction of the cylinder (2) and the carburetor (12) is located on the continuation of the intake pipe (10).

4. The engine according to any one of the preceding paragraphs, characterized in that the nozzle (24) for supplying air, at least partially, passes out of the carburetor (12).

5. The engine according to any one of the preceding paragraphs, characterized in that the limiting valve (25) is located above carbon below the carburetor (12).

7. The engine according to any one of the preceding paragraphs, characterized in that the limiting valve (25) is located outside of the carburetor (12).

 

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FIELD: mechanical engineering.

SUBSTANCE: invention relates to two stroke internal combustion crankcase compression engine designed for use in hand tools. According to invention, engine has at least one air channel between air intake and upper part, two scavenging channels with scavenging ports directed to side of discharge and located close to exhaust hole of cylinder. Engine has at least one scavenging port pointed to side of intake and located close of intake port of cylinder, delivery to said port being provided by at least one scavenging channel. Air channel and scavenging channels are of such design that such amount of air is fed and held in scavenging channels that nothing but air will get out during following scavenging process. Air intake from which air channel branches if provided with limiting valve controlled by at least one parameter of engine, for instance, under action of throttle valve of carburetor. Scavenging ports(s) pointed to side of intake is (are) arranged to provide beginning of delivering of air-fuel mixture later than scavenging with air through scavenging ports pointed to side of exhaust.

EFFECT: reduced consumption of fuel and discharge of noncombusted fuel with exhaust gases.

16 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: two-cycle engine with layer-by-layer blowdown includes piston, cylinder containing a piston with possibility of its back-and-forth movement, crankshaft that is connected to the piston by means of a piston-rod; casing containing the crankshaft with possibility of its rotation, gas mixture channel that supplies the gas mixture to the casing, blowdown channel that is continued between inlet blowdown opening that opens to the casing and blowdown opening that opens to cylinder and air channel that is connected to blowdown channel in intermediate position for supply of the air to blowdown channel. On some part of upward piston stroke, during which the piston moves towards the opposite side in relation to casing, the latter is connected to blowdown channel through blowdown opening; at that, negative pressure is created in the casing. Resistance to the flow from intermediate position of the blowdown channel where the air channel is connected to blowdown opening is lower than resistance to the flow from intermediate position, where air channel is connected to inlet blowdown opening. Versions of two-cycle engine design with layer-by-layer blowdown are described.

EFFECT: large amount of the air introduced to blowdown channel from air channel flows to blowdown opening and can enter the cylinder without changing the flow direction.

20 cl, 7 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to two stroke internal combustion crankcase compression engine designed for use in hand tools. According to invention, engine has at least one air channel between air intake and upper part, two scavenging channels with scavenging ports directed to side of discharge and located close to exhaust hole of cylinder. Engine has at least one scavenging port pointed to side of intake and located close of intake port of cylinder, delivery to said port being provided by at least one scavenging channel. Air channel and scavenging channels are of such design that such amount of air is fed and held in scavenging channels that nothing but air will get out during following scavenging process. Air intake from which air channel branches if provided with limiting valve controlled by at least one parameter of engine, for instance, under action of throttle valve of carburetor. Scavenging ports(s) pointed to side of intake is (are) arranged to provide beginning of delivering of air-fuel mixture later than scavenging with air through scavenging ports pointed to side of exhaust.

EFFECT: reduced consumption of fuel and discharge of noncombusted fuel with exhaust gases.

16 cl, 5 dwg

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: according to invention, engine includes at least two groups of cylinders. Each group contains one or several cylinders in which working processes are synchronous. Working processes in separate groups of cylinders process through equal angular spaces. In process of operation of engine, fuel-air mixture is sucked into crankcase by each group of cylinders separately, is partially compressed and bypassed into combustion chamber of other group of cylinders in which scavenging of cylinders occurs at this moment.

EFFECT: improved performance characteristics of two-stroke internal combustion engine with crankcase displacement scavenging owing to improvement of gas exchange process.

1 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to two stroke internal combustion crankcase compression engine designed for use in hand tools. According to invention, engine has at least one air channel between air intake and upper part, two scavenging channels with scavenging ports directed to side of discharge and located close to exhaust hole of cylinder. Engine has at least one scavenging port pointed to side of intake and located close of intake port of cylinder, delivery to said port being provided by at least one scavenging channel. Air channel and scavenging channels are of such design that such amount of air is fed and held in scavenging channels that nothing but air will get out during following scavenging process. Air intake from which air channel branches if provided with limiting valve controlled by at least one parameter of engine, for instance, under action of throttle valve of carburetor. Scavenging ports(s) pointed to side of intake is (are) arranged to provide beginning of delivering of air-fuel mixture later than scavenging with air through scavenging ports pointed to side of exhaust.

EFFECT: reduced consumption of fuel and discharge of noncombusted fuel with exhaust gases.

16 cl, 5 dwg

FIELD: machine building.

SUBSTANCE: invention refers to bearing unit of crankshaft of internal combustion engine. The bearing unit consists of bearing (10) mounted on crankshaft (16) of the internal combustion engine, of seat (11, 15) of the bearing designed for placement of bearing (10) and of system (20) of packing designed for sealing relative to crankshaft (16) and seat (11, 15) of the bearing. At least one part of seat (11) of the bearing has a reinforcing element (12) positioned in the seat of the bearing. Also, surface (13) of at least one part of seat (11) of the bearing adjoining bearing (10) is made out of plastic. There are also claimed the internal combustion engine comprising the said bearing unit and a hand tool with a mechanical drive containing the said internal combustion engine.

EFFECT: improved bearing unit of crankshaft due to bearing unit sealing and optimal installation of bearing and/or bushing of bearing in seat of bearing with decreased allowances, which prevents bearing and/or bushing of bearing rotation in bearing seat; minimised hazard of bearing distortion and bearing and/or bushing of bearing compression in bearing seat under force causing finite destruction of bearing and/or bushing of bearing.

13 cl, 4 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to hand-held devices driven by ICE. Proposed device comprises housing of engine (200) and ICE (202) with cylinder (204) and crankshaft. It incorporates fan wheel (214) driven by crankshaft to run about axle A. Fan casing (216) surrounds fan wheel (214) to interact therewith. Inlet (224) for air to be combusted is arranged radially outside fan wheel (214) to direct air to ICE (202) and has inlet (226) and channel (228). Inlet (226) has first edge (230) radially abutting on has wheel (214) outer periphery (220). Angle X between first line L1 extending radially from axle A parallel with the main direction of cylinder (204) and radius L2 extending radially from axle A so that to cross said first edge (230), is smaller than 70 degrees, preferably, smaller than 66 degrees and, more preferably, than 62 degrees. Invention covers the versions of hand-held device.

EFFECT: decreased weight.

20 cl, 6 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed engine comprises cylindrical housing with cover and bottom, percussion piston axially spring-loaded and fitted therein, combustion chamber arranged under housing cover, rod end composed of percussion piston second end and bottom, return spring fitted in said rod end and working tool stem extending through the hole on housing bottom outward, vent and bypass channels made in said housing, ignition unit electrically connected with spark plug fitted in housing cover. It differs from known devices in that said housing and piston are made of nonmagnetic material. Besides, this engine includes electronical unit, storage battery, generator, magnet fitted in nonmagnetic main piston, fuel pump, buffer fuel, electrically controlled atomiser and contactless ignition control system.

EFFECT: higher efficiency and reliability.

1 dwg

Carburettor unit // 2553481

FIELD: engines and pumps.

SUBSTANCE: invention relates to appliances for carburettors used for drives of hand-held tools. Proposed unit comprises carburettor (9) with inlet channel section (10). Said section accommodates throttle element and air choke element. First coupling element is fixed with throttle element while second coupling element is fixed with air choke element. In compliance with this invention, first and second coupling elements make a locking device which impedes closure of air choke element at idle throttle element.

EFFECT: simplified design, inhibited closure of air choke at idle throttle element.

19 cl, 22 dwg

FIELD: engines and pumps.

SUBSTANCE: invention can be used in four-stroke engines used in portable motorised tools. Four-stroke engine (1) includes housing (3) of a cylinder, which has opening (5) of the cylinder, in which piston (6) is located with a possibility of back-and-forth movement. Case (4) in which crank shaft (10) is installed with a possibility of being rotated is attached to housing (3) of the cylinder. Partition wall (43), (44) divides the inner space of case (4) into crank case (41), in which crank shaft (10) is installed and oil chamber (42) containing the oil that serves for lubrication of crank shaft (10). There is connection passage (45) connecting crank case (41) to oil chamber (42) and guiding the oil contained in crank case (41) and dripping under action of gravity force into oil chamber (42) and a supply assembly of oil contained in the oil chamber, which provides oil pumping to crank case (41). If an upward direction is determined as a direction in which piston (6) moves from the lower dead point to the upper dead point, then a cross section of partition wall (43), (44) is actually V-shaped if to look in an axial direction of crank shaft (10) and faces with its apex downwards, and connection passage (45) is made at the apex of the V-shaped cross section. A bush cutter is developed, which contains a four-stroke engine and a motorised tool containing a four-stroke engine.

EFFECT: preservation of reliable oil supply irrespective of location of an engine in an inclined state.

11 cl, 17 dwg

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