WO2004057169A1 - 層状掃気2サイクルエンジンの先導空気制御装置 - Google Patents
層状掃気2サイクルエンジンの先導空気制御装置 Download PDFInfo
- Publication number
- WO2004057169A1 WO2004057169A1 PCT/JP2003/016316 JP0316316W WO2004057169A1 WO 2004057169 A1 WO2004057169 A1 WO 2004057169A1 JP 0316316 W JP0316316 W JP 0316316W WO 2004057169 A1 WO2004057169 A1 WO 2004057169A1
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- WIPO (PCT)
- Prior art keywords
- air
- leading
- pair
- scavenging
- passage
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
- F02M35/108—Intake manifolds with primary and secondary intake passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
- F02B25/16—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke the charge flowing upward essentially along cylinder wall opposite the inlet ports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
- F02B25/22—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18 by forming air cushion between charge and combustion residues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10072—Intake runners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
- F02M35/10078—Connections of intake systems to the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/1019—Two-stroke engines; Reverse-flow scavenged or cross scavenged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10196—Carburetted engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Definitions
- the present invention relates to a leading air control device for controlling the amount of leading air for scavenging in a stratified scavenging two-cycle engine.
- FIG. 9 shows the leading air control device described in the above publication.
- a pair of scavenging ports 10 are provided on opposing side surfaces on the inner wall surface of the cylinder 3 in which the piston 4 is slidably fitted.
- the pair of scavenging ports 10 are connected to the crank chamber 11 by scavenging channels 12, respectively.
- a carburetor 42 is attached to an intake port 13 provided in the cylinder 3 via an insulator 41 for heat insulation, and an intake side of the carburetor 42 is connected to an air tarina 44.
- the vaporizer 42 is provided with a butterfly type throttle valve 43.
- the insulator 41 is provided with an intake passage 22 connecting the intake port 13 and the carburetor 42, and an air passage 45 for leading air.
- One side of the air passage 45 for the leading air is connected to the air cleaner 44, and the other side is bifurcated and branched to the left and right. It is connected to a pair of scavenging port 10 and scavenging flow path 12.
- a butterfly-type air control valve 25 for controlling the amount of leading air is provided upstream of the branch point of the air passage 45, and is configured to interlock with the throttle valve 43 of the carburetor 42. ing.
- the air control valve 25 can be mounted in a limited space, and the overall length M of the engine can be shortened, thereby making the engine compact and lightweight.
- an air control valve is provided in the air passage provided in the insulator, and the air passage is branched right and left downstream of the air control valve. It is connected to a pair of scavenging ports and a pair of scavenging channels provided on the left and right sides of the cylinder. This complicates the structure of the insulator and increases the length of the insulator, requiring a large field. As a result, the outer diameter of the engine is increased.
- the air passage formed in the insulator in a substantially linear shape when forming the air passage. For this reason, if the air passage is branched right and left in the insulator, it is complicated to form the branched air passage, and at the branch portion, the air passage has an elliptical shape, that is, a linear air passage. An intersecting shape will be formed. If the air passage at the branch is formed to have a sharp bend, the air flow at the bend will separate from the inner wall of the air passage and generate a vortex, resulting in an increase in air resistance. appear. Disclosure of the invention
- the present invention has been made in view of the above problems, and has a It is an object of the present invention to provide a leading air control device for a stratified scavenging two-cycle engine having a small flow resistance, a simple structure, and a compact structure.
- a pair of first air passages formed in an insulator inserted between the carburetor and the cylinder for heat insulation and connected to a pair of scavenging ports provided in the cylinder, respectively;
- the air cleaner and each first air passage are connected to each other, and a pair of second air passages arranged substantially in parallel and provided in each second air passage to control the amount of leading air for scavenging air
- the most important feature is a configuration having an air control valve.
- a pair of second air passages each having an air control valve and a pair of first air passages formed in the insulator are connected to each other. It can be configured as Further, as the air passage for the leading air, it is not necessary to provide a branch portion in the middle of the air passage to branch the passage to the left and right. Moreover, as the air passage formed in the insulator, the first air passage can be formed as a pair of independent air passages.
- the configuration of the first air passage in the insulator is simplified, and the shape of the insulator can be reduced. As a result, the entire stratified scavenging two-cycle engine can be made compact. You.
- the arrangement positions of the intake passage from the carburetor and the pair of leading air passages can be clearly separated and arranged. This prevents the leading air passage from intersecting with the intake passage from the carburetor on the way, and prevents a pair of leading air passages from being arranged on both sides of the carburetor intake passage. Therefore, the stratified scavenging two-cycle engine as a whole can be made simple and compact.
- the first air passage can be formed on the same plane as the scavenging port, and a smooth connection with low air resistance can be achieved.
- an air passage and an intake passage can be formed.
- the overall length of the piston can be kept low, the overall length of the engine can be reduced, and the engine can be made compact.
- the air control valve may be provided near the air cleaner or may be integrally formed with the air cleaner, and each of the second air passages may include a connection member connected to each of the first air passages.
- the main feature is that the inner peripheral wall of the air passage from the first air passage to each of the second air passages is formed smoothly and continuously over the length of the air passage.
- the connection member interposes the first air passage and the second air passage as a smooth continuous passage even if the connection positions of the first air passage and the second air passage are different. can do.
- the inner peripheral wall of the air passage from each first air passage to each second air passage is formed smoothly and continuously over the length of the air passage, thereby reducing the air resistance of the leading air in the air passage.
- a connection portion between the second air passage and the air cleaner, a carburetor and an air tally are provided.
- the distance between the air taller and the connection part can be widened, and a large air cleaner can be used as the air talina.
- a large-sized air cleaner can be connected and used even for a small-sized engine in which the positions of the intake port for the air-fuel mixture and the air flow path for the leading air are close to each other.
- the connecting members are used to connect the first air passages and the second air passages, the structure of the insulator is simplified, and the insulator can be manufactured compactly and at low cost. In addition, by forming the insulator compactly, the entire layered scavenging two-cycle engine can be compactly configured.
- connection portion at an end portion of the connection member is formed so as to be connected with a connected portion with a small change in an inner diameter cross-sectional area.
- connection between the connection member side and the connected portion side at the connection portion between the end portion of the connection member and the connected portion is performed in a state where the change in the inner diameter cross-sectional area is small.
- the inner peripheral wall of the air passage from each first air passage to each second air passage can be formed more smoothly and continuously over the length direction of the air passage.
- connection member has flexibility. Accordingly, since the connection member has flexibility, even if the connection position between the first air passage and the second air passage is different, the connection member smoothes the first air passage and the second air passage. As a simple continuous passage, it can be constructed easily and easily.
- the main feature of the present invention is that the first air passages are arranged substantially in parallel with each other, and each is formed as a substantially straight air passage. Accordingly, the first air passage formed in the insulator can be formed as an independent substantially linear air passage, so that the first air passage in the insulator can be easily formed. In addition, since the first air passage and the second air passage are connected by a flexible connecting member, the degree of freedom of the location where the inlet of the first air passage is formed can be selected. And the configuration of the insulator can be simplified.
- the configuration of the entire stratified scavenging two-cycle engine can be simplified, and the engine can be compactly configured.
- the air passage for the leading air can be configured as a smooth air passage with low air resistance.
- the air passages on the substantially straight line may have the shape of an air passage that widens from the upstream side to the downstream side, and conversely, from the upstream side to the downstream side. It includes all air passage shapes in which the central axis of the air passage is substantially straight, such as the shape of an air passage that narrows in the shape of a bulge toward the side.
- each of the first air passages has an air flow passage formed in a cylinder, and the pair of air flow passages and the pair of scavenging ports are arranged so as to be connectable on the same plane. Is the main feature.
- the air flow path formed in the cylinder and the scavenging port formed in the cylinder in the leading air air passage can be communicated on the same plane, and a straight line is connected from the air flow path to the scavenging port. be able to.
- the air flow path can be configured to be directly connected to the scavenging port in the cylinder. Also, an air flow path may be formed by a first air flow path formed in the cylinder and a second air flow path formed on the outer peripheral surface of the piston. Wear.
- the operating position of the biston came to the position where the second air flow path connected the first air flow path and the scavenging port. At this time, the first air flow path and the scavenging port are connected. At this time, since the first air flow path and the scavenging port are disposed on the same plane, a linear arrangement relationship from the first air flow path to the scavenging port via the second air flow path must be provided. Can be.
- the flow of the leading air from the air flow path to the scavenging port can be made to be a smooth flow state, and the leading air can flow into the scavenging port from the air flow path while maintaining the smooth flow state.
- a sufficient amount of leading air can be charged into the cylinder from the scavenging port.
- the total length of the piston can be kept low, the overall length of the engine can be reduced, and the engine can be configured compact. If the air flow path and the scavenging port are arranged on the same plane, When not, the flow of the leading air from the air flow path to the scavenging port is a vertically curved flow. For this reason, the flow that bends in the vertical direction causes problems such as a loss of energy generated and an increase in the length of the biston due to the formation of the air flow path bent in the vertical direction.
- FIG. 1 is a front sectional view of a stratified scavenging two-cycle engine equipped with a leading air control device of the present invention.
- FIG. 2 is a side sectional view of the leading air control device of the first embodiment, and is a sectional view taken along line AA of FIG.
- FIG. 3 is a plan sectional view of the leading air control device of the first embodiment, and FIG. It is B-B sectional drawing.
- FIG. 4 is a front sectional view of the stratified scavenging two-cycle engine according to the second embodiment, and is a sectional view taken along line DD of FIG.
- FIG. 5 is a side cross-sectional view of the stratified scavenging two-cycle engine in the second embodiment, and is a cross-sectional view taken along the line C-C in FIG.
- FIG. 6 is a plan sectional view of the stratified scavenging two-cycle engine according to the second embodiment, and is a sectional view taken along line EE of FIG.
- FIG. 7 is a side sectional view of the leading air control device of the third embodiment.
- FIG. 8 is a side cross-sectional view of the leading air control device of the fourth embodiment.
- FIG. 9 is a front sectional view of a stratified scavenging two-cycle engine equipped with a leading air control device in a conventional example.
- FIG. 1 is a front sectional view of a stratified scavenging two-cycle engine 1 provided with a leading air control device 20 of the present invention.
- a piston 4 is slidably fitted in a cylinder 3 mounted on an upper part of a crankcase 2, and a crankshaft 5 and a piston 4 rotatably mounted on the crankcase 2 are connected to each other. It is connected by connecting mouth 6.
- a spark plug 7 is attached to the top of the cylinder 3.
- a muffler 9 is attached to an exhaust port 8 provided on the wall of the cylinder 3. Slightly below the exhaust port 8 provided on the wall of the cylinder 3, the exhaust port A pair of scavenging ports 10, 10 for introducing leading air into the cylinder are provided at positions opposing both sides forming approximately 90 degrees in plan view with the port 8. 0 and the crank chamber 11 are connected by scavenging passages 12 and 12 respectively connected to a pair of scavenging ports 10 and 10.
- the scavenging flow paths 12 and 12 are formed in the cylinder 3.
- An intake port 13 is provided slightly below the scavenging port 10 on the wall surface of the cylinder 3 and opposite to the exhaust port 8. In the vicinity of the intake port 13, a pair of air flow paths 14, 14 connected to the pair of scavenging ports 10, 10 are open. Insulators 21 for heat insulation are attached to the openings of the intake ports 13 and the air flow paths 14, 14, and the intake paths 22, which communicate with the intake ports 13, are attached to the insulator 21. In addition, first air passages 23 and 23 communicating with the pair of air passages 14 and 14 are provided.
- One end of a carburetor 30 is attached to the intake passage 22, and the other end of the carburetor 30 is connected to the air cleaner 32.
- the carburetor 30 is provided with a butterfly type throttle valve 31 for controlling the amount of a mixture of air and fuel.
- the air cleaner 32 and the pair of first air passages 23, 23 are connected by a pair of second air passages 24, 24 arranged substantially in parallel.
- Each of the second air passages 24, 24 is provided with a butterfly type air control valve 25, 25 for controlling the amount of leading air.
- the throttle valve 31 and the air control valves 25 and 25 are connected by a link device or the like (not shown) and are configured to rotate in conjunction with each other.
- the configuration of the throttle valve 31 and the air control valves 25, 25 and the interlocking mechanism between the throttle valve 31 and the air control valves 25, 25 do not show the features of the present invention, A known configuration and a known interlocking mechanism can be adopted.
- the throttle valve and the air control valve are not limited to the butterfly type, and any throttle valve or air control valve that can control the air flow rate in the passage including a rotary type or the like can be used. Can be used.
- the leading air control device 20 is constituted by the insulator 21, the second air passage 24, the air control valve 25, the carburetor 30, the throttle valve 31, and the air cleaner 32.
- the air cleaner 32, the carburetor 30 and the insulator 21 are fastened to the cylinder 3 by the ports 28 and 28, and the first air passages 23 and 23 are connected to the air passages 14 and Connected to 14.
- FIG. 2 is a side cross-sectional view of the leading air control device 20 of the first embodiment
- FIG. 3 is a plan cross-sectional view
- FIG. 2 is a cross-sectional view taken along line AA of FIG. 3, and
- a pair of first protrusions 33, 33 integrally formed with the air taller 32 are in a parallel state. It is provided in. Air control valves 25 and 25 are provided in the third air passages 26 and 26 provided in the first projections 33 and 33, respectively.
- the insulator 21 inserted between the carburetor 30 and the cylinder 3 for heat insulation has a pair of second protrusions 3 each having a first air passage 23 in addition to the above-described intake passage 22. 4 and 3 4 are provided projecting obliquely upward.
- Each of the first protrusions 33, 33 and each of the second protrusions 34, 34 are connected by tubular connection members 35, 35 having fourth air passages 27, respectively.
- the insulator forming the intake passage 22 and the insulator forming the first air passage 23 can be formed separately. W
- Each of the third air passages 26, 26 and each of the fourth air passages 27, 27 constitute a pair of second air passages 24, 24.
- the connection member 35 is made of a flexible material such as rubber, and the fourth air passage 27 is formed in a smooth shape.
- step portions 35 a and 35 b are formed at both ends of the connection member 35. Due to the steps 35 a and 35 b formed at both ends of the connecting member 35, the inner diameter cross-sectional area of the connecting portion of the connecting member 35 and the first and second projecting portions 33 and 34 is almost the same. The inner peripheral surface of the enlarged diameter portion in the step portions 35a and 35b is tightly fitted to the outer peripheral surfaces of the first projecting portion 33 and the second projecting portion 34.
- the connection can be made in an airtight state.
- the inner peripheral wall between the first air passages 23, 23 and the second air passages 24, 24 can be smoothly and continuously formed in the length direction of the air passage.
- the leading air passage constituted by the first air passage 23 and the second air passage 24 is at least a fourth air passage constituted by the connection member 35.
- an air passage inclined downward toward the downstream side can be formed.
- an air passage for leading air constituted by the first air passage 23 and the second air passage 24 can be arranged above the intake passage 22.
- the intake passage 22 in the insulator 21 can be formed at a position where it can be easily connected to the carburetor 30.
- the second protruding portion 34 in the first air passage 23 can be configured at a position where it can be easily connected by the connecting member 35. Since the first air passage 23 and the second air passage 24 can be configured in such an arrangement relationship, the connection portion of the first protrusion 33 in the air cleaner 32, the carburetor 30 and the air cleaner It is possible to widen the distance between the connecting portion and 32, and it is possible to use a large-sized air cleaner as the air cleaner.
- the pair of leading air passages formed by the first air passages 23 and the second air passages 24 are connected to the third air passages 2 in the first protrusions 3 3, 3 3, respectively.
- the first air passages 23, 23 in 6, 26 and the second projecting portions 34, 34 can be arranged substantially in parallel.
- the third air passages 26, 26 are arranged substantially in parallel with each other, and each is formed as a substantially straight air passage.
- the first air passages 23, 23 are also arranged substantially in parallel with each other, and each is formed as a substantially straight air passage.
- the air passages on the substantially straight line may have the shape of an air passage that widens from the upstream side to the downstream side, and conversely, from the upstream side to the downstream side. Includes the shape of an air passage that narrows in the shape of a bulge toward the side, and encompasses all shapes including the shape of an air passage in which the center axis of the air passage is substantially straight. Things. Even if the space between the pair of first protrusions 33, 33 and the space between the second protrusions 34, 34 are different, the pair of flexible connection members 35, 35 can be formed. As a result, the connection between the second air passage 24 and the first air passage 23 can be formed as a smooth pipe shape.
- first protrusions 33, 33 and third air passages 26, 26 formed integrally with the air cleaner 32, and the first air passages 23, 33 in the insulator 21. It is possible to increase the degree of freedom with respect to a place that can be selected as the formation position of 23.
- the configuration of the insulator can be simplified.
- the arrangement of the pair of first protrusions 33, 33 and the pair of second protrusions 34, 34 can be configured as a simple arrangement.
- the configuration of the entire stratified scavenging two-cycle engine can be simplified, and the engine can be compactly configured.
- the air passage for the leading air can be configured as a smooth air passage with low air resistance.
- the crank chamber 11 is filled with a mixture of air and fuel from the air cleaner 32 by the carburetor 30.
- the intake port 13 is first closed, and the air-fuel mixture filling the crank chamber 11 is compressed.
- the exhaust port 8 is opened, and the exhaust gas is exhausted from the exhaust port 8 to the outside via the muffler 9.
- the leading air in the scavenging port 10 and the scavenging flow path 12 flows into the cylinder 3, and the remaining exhaust gas is exhausted from the exhaust port 8. Thereafter, the air-fuel mixture in the crank chamber 11 flows into the cylinder 3 chamber, but at this time, the biston 4 is on the ascent stroke, and the exhaust port 8 is closed by the piston 4, so that the air-fuel mixture is There is no danger of being discharged outside.
- the amount of air-fuel mixture passing through the carburetor 30 is controlled by the throttle valve 31, and the amount of leading air passing through the second air passage 24 is controlled by the air control valve 25.
- the throttle valve 3 1 ′ and the air control valve 25 are interlocked, the amount of air-fuel mixture and the amount of leading air are always balanced, and optimal supply is performed and optimal conditions are maintained. Combustion takes place.
- the leading air control device for a stratified scavenging two-stroke engine of the present invention has a configuration in which a pair of air passages are arranged in parallel and an air control valve is provided for each. Therefore, there is no need to branch the air passage to the left and right at the insulator section as in the conventional case, and the structure at the insulator section can be simplified.
- the air passage connecting the air cleaner and the air flow passage connected to the scavenging port of the engine can be made smooth, the air resistance in the air passage can be reduced, and the engine performance can be reduced. Can be improved.
- the first air passage formed in the insulator can have a straight and simple structure, and the length of the first air passage can be reduced. Therefore, the overall length L of the engine shown in FIG. 1 can be made shorter than the overall length M of the conventional engine shown in FIG. 6, and the entire engine can be made compact.
- the insulator 21 has a first air passage 23 respectively.
- the connecting member 35 by using a rubbing member as the connecting member 35, the assembly of the first air passage 23 and the second air passage becomes easy, and the assembled air passage is formed as a passage with low air resistance. It becomes easy to do.
- steps 35a and 35b at both ends of the connecting member 35, the inner diameter cross-sectional area is reduced at the connecting portion between the connecting member 35 and the first projecting portion 33 and the second projecting portion 34. Connection can be made with little change. As a result, pressure loss due to a change in the inner diameter cross-sectional area at the connection portion can be reduced.o
- FIG. 4 is a front sectional view of the stratified scavenging two-cycle engine, and is a sectional view taken along line DD of FIG.
- FIG. 5 is a side cross-sectional view of the stratified scavenging two-cycle engine, and is a cross-sectional view taken along the line C-C of FIG.
- FIG. 6 is a plan sectional view of the stratified scavenging two-cycle engine, and is a sectional view taken along line EE of FIG.
- the intake passage 22 communicates with the intake port 13 formed in the cylinder 3, and the intake port 13 communicates with the crank chamber 11.
- the first air passage formed in the insulator 21 The passage 23 communicates with a first air passage 14 a formed in the cylinder 3.
- the first air flow path 14a communicates with a second air flow path 14b also formed on the outer peripheral surface of the biston 4 via a leading air port 14d formed on the outer peripheral surface of the biston 4. ing.
- the leading air port 14d is configured as a part of the second air flow path 14b, and the second air flow path 14b is configured to be surrounded by the piston groove wall 14c.
- the second air flow path 14 b communicates with the third air flow paths 18 a and 18 b formed in the cylinder 3.
- the third air passages 18a and 18b communicate with the scavenging port 10 and the crank chamber 11 respectively.
- the scavenging ports 10 communicating with the third air passages 18a and 18b, respectively, may be provided at different positions on the inner peripheral surface of the cylinder 3 or at adjacent positions. Alternatively, they can be arranged as the same scavenging port 10.
- the first air flow path 14a and the scavenging port 10 are disposed so as to be connectable on the same plane via the second air flow path 14b. .
- the leading air is arranged substantially linearly.
- the first air flow path 14a can flow into the scavenging port 10 through the second air flow path 14b.
- a sufficient amount of leading air having a small passage resistance can be filled from the scavenging port 10 into the cylinder 3 or the like.
- the insulator 21 has a pair of first air passages 23 and 23 formed therein. As described above, the pair of first air passages 23 and 23 are branched by the third air passages 18a and 18b, respectively, and two sets of left and right scavenging air are disposed symmetrically in the cylinder chamber. Communication with port 10 are doing.
- the two sets of scavenging ports 10 on the left and right sides are not limited to being formed at two places on the left and right sides in the cylinder chamber, but the required number can be provided.
- the required number of scavenging ports is installed, the required number of third air passages 18 formed in the cylinder 3 that are branched from the second air passages 14 b formed in the piston 4 are distributed.
- the second air flow path 14b is formed on the outer peripheral surface of the biston 4, it is easy to arrange the first air flow paths 14a in parallel. Become.
- the pair of first air passages 23 communicating with the pair of first air passages 14a can be arranged in a substantially parallel state with the first air passages 14a, and It is easy to form the air passages 14a and the first air passages 23 in a substantially straight line.
- the sealing members 16 a and 1 6b can also be interposed.
- the pair of connecting members 35, 35 can be integrally formed via a connecting member 17, or the connecting members 35, 35 can be formed separately and independently.
- the air passage of the leading air and the intake passage 22 communicating with the carburetor 30 are formed as independent passages. They can be arranged differently in the vertical direction.
- leading air air passages on both sides of the carburetor 30 and to arrange the leading air air passages and the intake passages 22 so that they do not cross each other. Further, the air passage for the leading air and the intake passage 22 can be formed in a compact manner. By configuring the air passage of the leading air and the intake passage 22 in a neat arrangement relationship, the configuration of the leading air control device 20 can be made compact.
- the pair of first air passages 14a, 14a and the pair of first air passages 23, 23 may be formed in a substantially straight line in a substantially parallel state. Therefore, it is possible to configure the first air flow paths 14a, 14a in a state where the arrangement positions of the intake ports 13 are close to each other. Moreover, the air cleaner 32 can be connected to the first air passage 23 via the connecting member 35 with a smooth flow path shape. This makes it possible to connect a large air cleaner 32 with reduced air resistance even if the engine is a small stratified scavenging two-cycle engine.
- FIG. 7 is a side sectional view of the leading air control device 20a according to the third embodiment of the present invention.
- the same reference numerals are used for the same portions as those of the first embodiment, and the description of the same portions will be omitted, and only different portions will be described.
- the third embodiment differs from the first embodiment in that the first protrusion 33 formed integrally with the air cleaner 32 in the first embodiment is configured as a first protrusion 33 a separate from the air cleaner 32 a.
- the configuration is different from that of the embodiment.
- the other configuration has the same configuration as the first embodiment.
- FIG. 7 is a side sectional view of a leading air control device 20b according to a fourth embodiment of the present invention.
- the same reference numerals are used for the same portions as those of the first embodiment, and the description of the same portions will be omitted, and only different portions will be described.
- the fourth embodiment differs from the second embodiment in the formation of an air passage tube 37 corresponding to the first protrusion 33a in the third embodiment.
- the first protrusion 33a is formed on a joint member 36 interposed between the air tarina 32a and the carburetor 30a.
- the air passage pipe 37 is formed in an air passage member 39 integrally formed with a bracket 38 fixed to an upper portion of the carburetor 30b.
- Other configurations have the same configurations as the first to third embodiments.
- an air passage member 39 in which a pair of air passage pipes 37 and a bracket 38 are integrally formed is fixed to an upper portion of the carburetor 30b by a port (not shown).
- the air tarina 32b and the air passage tube 37 are connected by fitting with a spigot.
- An O-ring (not shown) is inserted into the spigot to maintain airtightness.
- the air passage pipe 37 is provided with an air control valve 25. Also, the connection between the two ends of the pair of air passage members 39 and the air cleaner 32a and the connection with the connection member 35 are connected in a state where there is almost no change in the inner diameter cross-sectional area at the connection. are doing.
- the shape of the air cleaner can be simplified, and the cost can be reduced.
- connection member is a pair of tubular members, it may have a configuration in which one member has two air passages, and may be made of metal or synthetic resin in addition to rubber or the like.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004562056A JP4268138B2 (ja) | 2002-12-20 | 2003-12-19 | 層状掃気2サイクルエンジンの先導空気制御装置 |
US10/524,904 US7128031B2 (en) | 2002-12-20 | 2003-12-19 | Lead air control apparatus of stratified scavenging two-cycle engine |
EP03782823A EP1574683B1 (en) | 2002-12-20 | 2003-12-19 | Lead air control device of stratified scavenging two-cycle engine |
AU2003292578A AU2003292578A1 (en) | 2002-12-20 | 2003-12-19 | Lead air control device of stratified scavenging two-cycle engine |
DE60336678T DE60336678D1 (de) | 2002-12-20 | 2003-12-19 | Eitaktsp lmotors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002369730 | 2002-12-20 | ||
JP2002/369730 | 2002-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004057169A1 true WO2004057169A1 (ja) | 2004-07-08 |
Family
ID=32677149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/016316 WO2004057169A1 (ja) | 2002-12-20 | 2003-12-19 | 層状掃気2サイクルエンジンの先導空気制御装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7128031B2 (ja) |
EP (1) | EP1574683B1 (ja) |
JP (1) | JP4268138B2 (ja) |
CN (1) | CN100371571C (ja) |
AU (1) | AU2003292578A1 (ja) |
DE (1) | DE60336678D1 (ja) |
WO (1) | WO2004057169A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006194250A (ja) * | 2005-01-15 | 2006-07-27 | Andreas Stihl Ag & Co Kg | 2サイクルエンジン |
JP2015203357A (ja) * | 2014-04-14 | 2015-11-16 | 株式会社マキタ | 携帯型作業機のキャブレタ取付け構造及び取付け方法 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007177774A (ja) * | 2005-12-28 | 2007-07-12 | Komatsu Zenoah Co | 2サイクルエンジン |
DE102007034181B4 (de) | 2006-08-30 | 2018-05-30 | Dolmar Gmbh | Zweitaktmotor mit einem verbesserten Überströmkanal |
DE202006013285U1 (de) * | 2006-08-30 | 2008-01-03 | Dolmar Gmbh | Zweitaktmotor mit einem verbesserten Überströmkanal |
US20100294249A1 (en) * | 2006-10-19 | 2010-11-25 | Husqvarna Zenoah Co., Ltd. | Insulator |
ITRE20080003A1 (it) * | 2008-01-10 | 2009-07-11 | Emak Spa | '' dispositivo per l'alimentazione di un motore a combustione interna '' |
WO2012001731A1 (en) * | 2010-06-28 | 2012-01-05 | Husqvarna Zenoah Co., Ltd. | Air supply device |
RU2545178C2 (ru) * | 2010-08-20 | 2015-03-27 | Хускварна Зеноа Ко., Лтд. | Устройство подачи воздуха для двухтактного двигателя внутреннего сгорания |
JP5552105B2 (ja) * | 2011-11-04 | 2014-07-16 | 富士重工業株式会社 | エンジンの吸気装置 |
JP2018013076A (ja) * | 2016-07-20 | 2018-01-25 | 株式会社やまびこ | 層状掃気式エンジンの吸入管 |
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JPH09112365A (ja) * | 1995-10-20 | 1997-04-28 | Mitsubishi Automob Eng Co Ltd | 内燃機関の吸気装置 |
JP2000018453A (ja) * | 1998-07-06 | 2000-01-18 | Toyoda Spinning & Weaving Co Ltd | ダクトの接合部構造 |
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JP2002227653A (ja) * | 2001-02-01 | 2002-08-14 | Kioritz Corp | 2サイクル内燃エンジン |
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US4075985A (en) | 1975-06-20 | 1978-02-28 | Yamaha Hatsudoki Kabushiki Kaisha | Two cycle internal combustion engines |
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JPH09112360A (ja) | 1995-10-23 | 1997-04-28 | Hitachi Constr Mach Co Ltd | 外気吸入配管用レインキャップ装置 |
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- 2003-12-19 EP EP03782823A patent/EP1574683B1/en not_active Expired - Lifetime
- 2003-12-19 AU AU2003292578A patent/AU2003292578A1/en not_active Abandoned
- 2003-12-19 DE DE60336678T patent/DE60336678D1/de not_active Expired - Lifetime
- 2003-12-19 US US10/524,904 patent/US7128031B2/en not_active Expired - Lifetime
- 2003-12-19 JP JP2004562056A patent/JP4268138B2/ja not_active Expired - Lifetime
- 2003-12-19 WO PCT/JP2003/016316 patent/WO2004057169A1/ja active Application Filing
- 2003-12-19 CN CNB2003801010180A patent/CN100371571C/zh not_active Expired - Lifetime
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JP2000018453A (ja) * | 1998-07-06 | 2000-01-18 | Toyoda Spinning & Weaving Co Ltd | ダクトの接合部構造 |
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JP2006194250A (ja) * | 2005-01-15 | 2006-07-27 | Andreas Stihl Ag & Co Kg | 2サイクルエンジン |
JP2015203357A (ja) * | 2014-04-14 | 2015-11-16 | 株式会社マキタ | 携帯型作業機のキャブレタ取付け構造及び取付け方法 |
Also Published As
Publication number | Publication date |
---|---|
DE60336678D1 (de) | 2011-05-19 |
JPWO2004057169A1 (ja) | 2006-04-20 |
US7128031B2 (en) | 2006-10-31 |
AU2003292578A1 (en) | 2004-07-14 |
JP4268138B2 (ja) | 2009-05-27 |
EP1574683B1 (en) | 2011-04-06 |
CN100371571C (zh) | 2008-02-27 |
US20060060157A1 (en) | 2006-03-23 |
CN1703571A (zh) | 2005-11-30 |
EP1574683A4 (en) | 2010-06-30 |
EP1574683A1 (en) | 2005-09-14 |
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