JP3799183B2 - Engine intake system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine intake device including a fuel supply device that supplies fuel to an intake passage.
[0002]
[Prior art]
Engines mounted on vehicles such as motorcycles include two-cycle engines and four-cycle engines, and these engines are provided with an intake device. As this intake device, for example, there is one provided with a fuel supply device that supplies fuel to an intake passage.
[0003]
[Problems to be solved by the invention]
In such an intake device, air and fuel are mixed and supplied. However, in order to improve the charging efficiency of the air-fuel mixture, for example, there is one in which a rectifying plate or the like is disposed in the intake passage. Just rectifying the air-fuel mixture with the flow straightening plate in this way was not enough to atomize the air-fuel mixture, it was not enough to prevent blowback, fuel consumption was increased, and harmful components in the exhaust gas were not sufficiently reduced There wasn't.
[0004]
The present invention has been made in view of such circumstances, and while improving the atomization rate of the air-fuel mixture and preventing blowback, it improves combustion efficiency and fuel efficiency, and further eliminates harmful effects in exhaust gas. An object of the present invention is to provide an engine intake device that can reduce components.
[0005]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the present invention is configured as follows.
[0006]
  According to the first aspect of the present invention, there is provided an engine intake device including a fuel supply device that supplies fuel to an intake passage, wherein a plate having a plurality of holes is provided in an intake passage downstream of the fuel supply device., Almost parallel to the direction of intake air flowPlace and
The hole isThe size of the holeLarge upstream, small downstreamAn intake system for an engine characterized by that. ].
[0007]
  According to the first aspect of the present invention, the fuel supplied by the fuel supply device is mixed with air.By arranging a plate having a large number of holes in the intake passage downstream of the fuel supply device so as to be substantially parallel to the flow direction of the intake air,Without lowering the flow velocity of the intake air flow, the atomization rate of the mixture can be further improved, combustion efficiency and fuel efficiency can be improved, and harmful components in the exhaust gas can be reduced. .In addition, since the size of the hole is large on the upstream side and small on the downstream side, the turbulent flow is further generated and atomized on the upstream side, and the air-fuel mixture blown back on the downstream side can be stopped. Also,Further turbulent flow is generated by the plate and atomized, and the fuel component of the air-fuel mixture remains as droplets in the holes of the plate by preventing blowback, and this residual air-fuel mixture is supplied in the next intake stroke. Since the air-fuel mixture atomized in stages is supplied, combustion efficiency is improved, fuel efficiency is improved, and harmful components in the exhaust gas can be reduced.
[0008]
  The invention according to claim 2 is: "In an intake system of an engine provided with a fuel supply device for supplying fuel to the intake passage, a plate having a number of holes in the intake passage downstream of the fuel supply device;, Almost parallel to the direction of intake air flowPlace multiple
  The upstream plate and the downstream plate have a hole size.Large upstream, small downstreamAn intake system for an engine characterized by that. ].
[0009]
  According to the invention of claim 2, the fuel supplied by the fuel supply device is mixed with air,By arranging a plurality of plates with a large number of holes along the direction of the intake air flow, the atomization rate of the air-fuel mixture can be further improved without reducing the flow velocity of the intake air flow. It is possible to improve combustion efficiency and fuel consumption, and to reduce harmful components in exhaust gas. Also, since the upstream plate and the downstream plate have large holes on the upstream side and small on the downstream side, more turbulence is generated on the upstream side and atomized, and the mixture that blows back on the downstream side is stopped. Can do. Also,A further turbulent flow is generated and atomized, and the fuel component of the atomized air-fuel mixture remains as droplets in the holes of the plate by preventing blowback, and this residual air-fuel mixture is supplied in the next intake stroke, Since the air-fuel mixture atomized in these two stages is supplied, the combustion efficiency is improved, fuel efficiency is improved, and harmful components in the exhaust gas can be reduced.
[0014]
ClaimThreeAccording to the invention described in "a plurality of plates having a plurality of holes".IsIn the flow direction of the intake airAlmost parallelThe engine air intake device according to claim 2, wherein the engine air intake device is disposed along the upstream side and the downstream side, and the mounting angles of the plurality of plates are changed. ].
[0015]
This claimThreeAccording to the described invention, it is possible to further improve the atomization rate of the air-fuel mixture without lowering the flow velocity of the intake air flow regardless of the mounting direction of the intake passage, and to improve the combustion efficiency and the fuel efficiency. It is possible to improve and further reduce harmful components in the exhaust gas.
[0016]
ClaimFourThe invention described in “The plate having a large number of holes”Is2. An intake means disposed in the intake passage, wherein the intake means is provided.ThreeThe intake device for an engine according to any one of the above. ].
[0017]
This claimFourAccording to the described invention, the turbulent flow is generated by the plate provided in the suction means such as the reed valve and the piston valve, and the atomized mixture is directly supplied to the primary compression chamber of the intake air of the crank chamber. Therefore, combustion efficiency is improved and fuel efficiency is further improved. In addition, the fuel component of the air-fuel mixture atomized by preventing blowback remains as droplets in the holes of the plate, and this residual air-fuel mixture is supplied in the next intake stroke, so that the combustion efficiency is further improved, Harmful components in exhaust gas can also be reduced.
[0018]
ClaimFiveThe invention described in “The plate having a large number of holes”Is2. An insulator disposed in the intake passage, wherein the insulator is disposed in the intake passage.ThreeThe intake device for an engine according to any one of the above. ].
[0019]
This claimFiveAccording to the described invention, the fuel component of the air-fuel mixture atomized by completely stopping the air-fuel mixture that blows back the plate having a large number of holes by the insulator disposed in the intake passage becomes droplets in the holes of the plate. In addition, since this residual air-fuel mixture is supplied in the next intake stroke, the combustion efficiency is further improved, and harmful components in the exhaust gas can be reduced.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an engine intake device of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment applied to a two-cycle engine. FIG. 1 is a longitudinal sectional view of a two-cycle engine equipped with an intake device. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 4 is a diagram illustrating a state of the air-fuel mixture flow, and FIG. 4 is a diagram illustrating a plate having a large number of holes.
[0021]
The two-cycle engine 1 includes a crankcase 2, and the crankcase 2 includes an upper case 3 and a lower case 4. A crankshaft 5 is pivotally supported between the upper case 3 and the lower case 4, and a crank chamber 6 is formed by the upper case 3 and the lower case 4.
[0022]
A cylinder block 7 is attached to the upper case 3, and a cylinder head 8 is attached to the cylinder block 7. The cylinder 9 formed in the cylinder block 80 is provided with a piston 10 so as to be able to reciprocate. A combustion chamber 11 is formed between the cylinder 9, the head of the piston 10, and the cylinder head 8. Is attached so that the spark plug 12 faces the combustion chamber 11. The cylinder block 7 has three scavenging passages 13 communicating with the crank chamber 6 and the combustion chamber 11 in the scavenging stroke, and an exhaust passage 14 for exhausting the exhaust gas in the combustion chamber 11 in the exhaust stroke. Yes. Of the three scavenging passages 13, two scavenging passages 13 are arranged opposite to each other in the radial direction of the cylinder 9, and the remaining one scavenging passage 13 is the two opposing scavenging passages 13. Is disposed opposite the exhaust passage 14.
[0023]
Two piston rings 15 are provided on the top of the piston 10. A small end 21 a of a connecting rod 21 is rotatably supported by a piston pin 20 provided on the piston 10 via a bearing 22, and a large end 21 b of the connecting rod 21 is supported by a crank pin 23 of the crankshaft 5 via a bearing 24. The connecting rod 21 converts the reciprocating motion of the piston 10 into a rotational motion and transmits it to the crankshaft 5.
[0024]
An intake pipe 30 is attached to the upper case 3 of the crankcase 2 via a reed valve 7, and a carburetor 31 as a fuel supply device is further connected to the intake pipe 30. In the reed valve 7, a suction port 71 is formed in a body 70, and a valve 72 and a valve stopper 73 that open and close the suction port 71 are fastened together by screws 74. The reed valve 7 serving as an intake means opens in the intake stroke in which the crank chamber 6 has a negative pressure, and the air-fuel mixture is sucked from the intake passage 30a of the intake pipe 30. Thus, the reed valve 7 allows only the flow of intake air from the intake pipe 30 toward the crank chamber 6, and uses the crank chamber 6 as a primary compression chamber for intake air.
[0025]
A plate 50 having a large number of holes is disposed in the reed valve 7 disposed in the intake passage 30a downstream of the carburetor 31 serving as a fuel supply device. The plate 50 having a large number of holes is formed such that the upstream hole 50a1 is large and the downstream hole 50a2 is small.
[0026]
The fuel supplied by the carburetor 31 is mixed with air. However, when the valve 72 of the reed valve 7 is opened and sucked from the suction port 71, as shown in FIG. Since the hole 50a1 is large and the downstream hole 50a2 is small, more turbulent flow is generated on the upstream side and atomized, and blowback can be prevented on the downstream side. In this way, the air-fuel mixture that blows back is stopped and remains as a droplet in the hole 50a2 on the downstream side, and this residual air-fuel mixture is supplied in the next intake stroke, and the air-fuel mixture atomized in these two stages is supplied. Therefore, combustion efficiency is improved, fuel efficiency is further improved, and harmful components in the exhaust gas can be reduced.
[0027]
Further, the plate 50 having a large number of holes is provided in the reed valve 7 disposed in the intake passage 30a, and the air-fuel mixture that is atomized by the turbulent flow caused by the plate 50 is directly sucked into the crank chamber 6. Combustion efficiency is improved because it is supplied to the primary compression chamber of air, fuel efficiency is further improved, and harmful components in exhaust gas, such as carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx). Can be reduced.
[0028]
  Further, the plate 50 having a large number of holes can be configured as shown in FIG. FIG. 5 (a)It is a reference figure,The hole 50a3 on the most upstream side of the plate 50 is small, the hole 50a1 on the upstream side is large, and the hole 50a2 on the downstream side is small.. FIG.(B)Is an embodiment,The uppermost stream side hole 50a3 of the plate 50 is formed to be larger and smaller, the upstream side hole 50a1 is larger, and the downstream side hole 50a2 is formed smaller, and the turbulent flow is more effectively generated to atomize the air-fuel mixture. It is possible to improve combustion efficiency and fuel consumption, and to reduce harmful components in exhaust gas.. A plate 50 having a number of holes is shown in FIG.It may be arranged on the reed valve 7 as shown inFigure 1as well asFigure 2As shown in FIG. 5, the plate 50 becomes larger and more holes 50a1 and 50a2 can be formed, and the turbulent flow can be more effectively generated to atomize the air-fuel mixture. In this embodiment, the plate 50 is arranged in parallel with the flow of the air-fuel mixture.The
[0029]
7 to 9 show another embodiment applied to a two-cycle engine, FIG. 7 is a longitudinal sectional view of a two-cycle engine provided with an intake device, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. FIG. 9 is a view showing another arrangement of a plate having a large number of holes.
[0030]
In this embodiment, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals and description thereof is omitted.
[0031]
In this embodiment, a plurality of plates 200 and 201 having a large number of holes are positioned on the upstream side and the downstream side along the flow direction of intake air, and the mounting angles of the plurality of plates 200 and 201 are changed. It is arranged. The hole 201a of the upstream plate 201 is large, and the hole 200a of the downstream plate 200 is small.
[0032]
The downstream plate 200 is at a position facing the suction port 71 of the reed valve 7, and the upstream plate 201 intersects the downstream plate 200 at approximately 45 degrees as shown in FIG. The mounting angle is changed.
[0033]
As described above, the plurality of plates 200 and 201 are positioned on the upstream side and the downstream side along the flow direction of the intake air, and the mounting angles of the plurality of plates 200 and 201 are changed, so that the intake passage 30a is arranged. Regardless of the mounting direction of the engine, the flow rate of the intake air flow is not reduced, the atomization rate of the air-fuel mixture can be further improved, the combustion efficiency is improved, the fuel consumption is improved, and the exhaust gas in the exhaust gas is further improved. Harmful components such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) can be reduced.
[0034]
In this embodiment, the two upstream and downstream plates 200 and 201 are integrally formed by a single plate, and can be easily manufactured, and can be easily assembled to the intake passage 30a. It is.
[0035]
In the embodiment of FIG. 9, the downstream plate 200 is at a position orthogonal to the inlet 71 of the reed valve 7, and the upstream plate 201 is approximately 45 degrees with respect to the downstream plate 200. The attachment angle is changed by intersecting, and the atomization rate of the air-fuel mixture can be further improved without reducing the flow velocity of the intake flow regardless of the attachment direction of the intake passage 30a.
[0036]
FIG. 10 is a cross-sectional view showing another embodiment of the reed valve. In the reed valve 300 of this embodiment, two central plates 301 are disposed inside, and two outer plates 302 are disposed outside the central plate 301. The two central plates 301 are arranged so as to be deviated downstream with respect to the outer plate 302. The two central plates 301 have a large number of holes, the upstream holes 301a1 are large, and the downstream holes 301a2 is formed small. Similarly, the two outer plates 302 have a large number of holes, the upstream hole 301a1 is large and the downstream hole 301a2 is small, and the turbulent flow of the intake air flows evenly, so that the inner central plate Guide to the 301 side, increase the outside flow velocity and guide to the crank chamber. The two central plates 301 and the outer plate 302 have larger upstream holes 301a1 and 302a1 and smaller downstream holes 301a2 and 302a2, so that they are further turbulent and atomized and blown back. By preventing this, droplets remain in the downstream holes, and this residual air-fuel mixture is supplied in the next intake stroke, so that combustion efficiency is improved and fuel efficiency is further improved.
[0037]
Figure 11These are the longitudinal cross-sectional views which show other embodiment applied to the 2-cycle engine. In the two-cycle engine 1 of this embodiment, a reed valve 401 is assembled to an intake inlet 400a of a crankcase 400, and a carburetor 403 that is a fuel supply device is connected to the intake inlet 401 via an intake pipe 402. ing. The intake passage 404 on the downstream side of the carburetor 403 has an upstream sideIs big,DownstreamIs formed smallA plate 405 having a large number of holes is arranged, and a gap is formed between the outside of the cylindrical plate 405 and the inner wall of the exhaust passage 414.
[0038]
  In the two-cycle engine 1 of this embodiment, the reed valve 401 opens in the compression stroke in which the piston 410 rises, the air-fuel mixture enters the crank chamber 411, the air-fuel mixture burns in the combustion chamber 412, and the piston 410 descends. In the scavenging stroke, the reed valve 401 is closed, the air-fuel mixture in the crank chamber 411 is compressed, supplied from the scavenging passage 413 to the combustion chamber 412, and exhaust gas is discharged from the exhaust passage 414. In this embodiment, upstream of the vaporizer 403Is big,DownstreamIs formed smallTurbulent flow is generated and atomized by the cylindrical plate 405 having a large number of holes, and the air-fuel mixture blown back into the gap between the outer side of the cylindrical plate 405 and the inner wall of the exhaust passage 414 can be stopped. As a result, the air-fuel mixture remains as droplets on the cylindrical plate 405, and this residual air-fuel mixture is supplied in the next intake stroke, so that the combustion efficiency is further improved.
[0039]
12 and 13 show an embodiment of an insulator disposed in an intake system of a two-cycle engine, FIG. 12 is a front view of the insulator, and FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG.
[0040]
  In the insulator 500 of this embodiment, a plurality of ribs 501 having a large number of holes 501a are formed on the downstream side, and a cylindrical plate 502 having a large number of holes 502a is arranged on the upstream side. And a gap is formed between the inner wall of the exhaust passage 503. The rib 501 is arranged along the flow of the intake air, and the hole 501a is formed in the rib 501.The upstream side is large and the downstream side is small.The hole 502a of the cylindrical plate 502 isThe upstream side is large and the downstream side is small.Alternatively, the size of the hole 501a of the rib 501 and the hole 502a of the cylindrical plate 502 isThe upstream side is large and the downstream side is small.
[0041]
In the insulator 500 of this embodiment, the air-fuel mixture is atomized by the cylindrical plate 502, and this atomized air-fuel mixture is evenly divided and mixed into the reed valve chamber by the rib 501. The efficiency and fuel efficiency can be improved, and harmful components such as carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) in the exhaust gas can be reduced. Further, the air-fuel mixture blows back and the air-fuel mixture remains as droplets between the ribs 501. Further, the air-fuel mixture blown back between the outer side of the cylindrical plate 502 and the inner wall of the exhaust passage 503 can be completely stopped, and as a result, the air-fuel mixture remains as droplets on the cylindrical plate 502. Since the air-fuel mixture is supplied in the next intake stroke, the combustion efficiency is further improved.
[0042]
FIG. 14 shows an embodiment of a two-cycle engine, FIG. 14 (a) is a sectional view of the two-cycle engine, and FIG. 14 (b) is a sectional view taken along the line bb of FIG. 14 (a).
[0043]
  The two-cycle engine 600 of this embodiment is a piston valve intake type engine. An intake passage 602 is formed in the crankcase 601 so as to open to the cylinder bore 601 a, and this opening is opened and closed by a reciprocating motion of the piston 603. In the intake passage 602,The upstream side is large and the downstream side is small.A plate 610 having a large number of holes is arranged, and a gap is formed between the outside of the cylindrical plate 610 and the inner wall of the exhaust passage 602. In addition, a central plate 611 that is parallel to the flow of intake air is provided at the center of the cylindrical plate 610.Many holes are formed on the upstream side and on the downstream side are small.
[0044]
The opening 602a of the intake passage 602 is opened in the compression stroke in which the piston 603 is raised, the air-fuel mixture enters the crank chamber 604, the air-fuel mixture is combusted in the combustion chamber 605, and the intake passage 602 is opened in the scavenging stroke in which the piston 603 is lowered. The air-fuel mixture in the crank chamber 604 is compressed and supplied from the scavenging passage 606 to the combustion chamber 605, and exhaust gas is discharged from the exhaust passage 607.
[0045]
In this embodiment, a turbulent flow is generated in the intake passage 602 formed in the crankcase 601 by the cylindrical plate 610 and the central plate 611 and atomized, and the outside of the cylindrical plate 610 and the exhaust passage 602 are The air-fuel mixture that blows back into the gap between the inner wall can be stopped. As a result, the air-fuel mixture remains as droplets on the cylindrical plate 610 and the central plate 611, and this residual air-fuel mixture is supplied in the next intake stroke, so that the combustion efficiency is further improved.
[0046]
15 to 17 show another embodiment of the two-cycle engine. FIG. 15 is a side view of the two-cycle engine, FIG. 16 is a sectional view of the two-cycle engine, and FIG. 17 is a perspective view of the rotary valve.
[0047]
The two-cycle engine 700 of this embodiment is a rotary valve intake type engine. A crankshaft 702 is pivotally supported on the crankcase 701, and a rotary valve 703 is fixed to the end of the crankshaft 702. A valve cover 704 is provided on the side of the crankcase 701, and the rotary valve 703 is disposed in a valve chamber 705 formed by the valve cover 704. The valve chamber 705 communicates with the crank chamber 708 through an intake hole 707 formed in the crankcase 701.
[0048]
A vaporizer 710 is connected to the valve cover 704, and the air-fuel mixture from the vaporizer 710 is supplied to the valve chamber 705 via the intake passage 711. As the rotary valve 703 rotates and opens and closes the intake hole 707, the air-fuel mixture in the valve chamber 705 is supplied to the crank chamber 708 via the intake hole 707.
[0049]
  In the intake passage 711 formed in the valve cover 704,The upstream side is large and the downstream side is small.A cylindrical plate 720 having a large number of holes is disposed, and a gap is formed between the outside of the cylindrical plate 720 and the inner wall of the exhaust passage 711. In addition, a central plate 721 parallel to the flow of intake air is provided at the central portion of the cylindrical plate 720.A number of holes are formed such that the upstream side is large and the downstream side is small.
[0050]
In this embodiment, a turbulent flow is generated in the intake passage 711 formed in the crankcase 701 by the cylindrical plate 720 and the central plate 721 and atomized, and the outside of the cylindrical plate 720 and the exhaust passage 711 The air-fuel mixture that blows back into the gap between the inner wall can be stopped. As a result, the air-fuel mixture remains as droplets on the cylindrical plate 720 and the central plate 721, and this residual air-fuel mixture is supplied in the next intake stroke, so that the combustion efficiency is further improved.
[0051]
Next, an embodiment applied to a 4-cycle engine will be described. FIG. 18 is a longitudinal sectional view of a four-cycle engine provided with an intake device.
[0052]
A cylinder head 103 is attached to a cylinder block 102 of a four-cycle engine 101 having a large number of cylinders. The cylinder head 103 includes a head lower portion 104 and a head upper portion 105. A combustion chamber 107 is formed by the head lower portion 104 and the piston 106 fitted to the cylinder block 102, and a head cover 108 is attached to the head upper portion 105. An intake passage 109 is formed in the head lower portion 104, and the intake passage 109 is opened to the combustion chamber 107 by three branch passages 109a.
[0053]
An intake valve 112 is provided in each branch passage 109 a of the intake passage 109, and the air-fuel mixture is supplied to the combustion chamber 107 by opening and closing the intake valve 112. An exhaust passage 115 is formed in the head lower portion 104, and the exhaust passage 115 has a pair of branch passages 115 a that open to the combustion chamber 107. The branch passage 115a is provided with an exhaust valve (not shown), and exhaust gas is discharged from an exhaust pipe (not shown) connected to the exhaust passage 115 by opening and closing the exhaust valve.
[0054]
An intake pipe 110 is connected to the intake passage 109, and an injector 111, which is a fuel supply device, is provided in the intake pipe 110, and fuel is injected at a predetermined timing. A spark plug 150 is attached to the lower head portion 104 so as to face the combustion chamber 107.
[0055]
  A plate 60 having a large number of holes 60a is disposed in the intake passage 109 on the downstream side of the injector 111, which is a fuel supply device. In this embodiment, the plate 60 is arranged in parallel with the mixture flow.The
[0056]
  The fuel supplied by the injector 111 mixes with air, butThe upstream side is large and the downstream side is small.A plate 60 having a large number of holes 60a is arranged. This plate 60 is configured in the same manner as in the embodiment of the two-cycle engine, and a large number of holes are formed with a large upstream hole and a small downstream hole so that further turbulence is generated on the upstream side. It is atomized and can be prevented from blowing back on the downstream side. In this way, since the air-fuel mixture that blows back is stopped and remains as a droplet in the hole on the downstream side, this residual air-fuel mixture is supplied in the next intake stroke, and the air-fuel mixture atomized in these two stages is supplied Combustion efficiency is improved, fuel efficiency is further improved, and harmful components in exhaust gas can be reduced.
[0057]
Next, another embodiment applied to a four-cycle engine will be described. FIG. 19 is a longitudinal sectional view of a four-cycle engine provided with an intake device. In this embodiment, the same components as those in the embodiment shown in FIG. 18 are denoted by the same reference numerals and description thereof is omitted.
[0058]
  In this embodiment, a plurality of plates 900, 901 having a large number of holes 900a, 901a are positioned on the upstream side and the downstream side along the flow direction of intake air, and the mounting angles between the plurality of plates 900, 901 are set. Are arranged differently. The hole 900a of the plate 900 is small, the hole 901a of the plate 901 is formed large, and the size of the holes is different.The upstream side is large and the downstream side is small.In this embodiment, regardless of the mounting direction of the intake passage 30a, the flow rate of the intake air flow is not reduced, the atomization rate of the air-fuel mixture can be further improved, the combustion efficiency is improved, and the fuel efficiency is improved. Improvement can be achieved, and harmful components such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) in the exhaust gas can be reduced.
[0059]
  FIG.These are the longitudinal cross-sectional views explaining further another embodiment applied to the 4-cycle engine. In this embodiment, the intake passage 30aFigure 14Similar to that shown inThe upstream side is large and the downstream side is small.A plate 800 having a large number of holes is arranged, and a gap is formed between the outside of the cylindrical plate 800 and the inner wall of the exhaust passage 30a. In addition, a central plate 801 parallel to the flow of intake air is provided at the central portion of the cylindrical plate 800, and the central plate 801 has a number of holes.Has a large upstream side and a small downstream side.
[0060]
When the piston 803 descends and the intake valve 804 opens, the air-fuel mixture enters the combustion chamber 805, the intake valve 804 and the exhaust valve 806 close, the piston 803 rises, and the air-fuel mixture is compressed in the combustion chamber 605 and burned. When the exhaust valve 806 is opened, the exhaust gas is discharged from the exhaust passage 808. In this embodiment, turbulent flow is generated and atomized by the cylindrical plate 800 and the central plate 801 disposed in the intake passage 30 a, and between the outside of the cylindrical plate 800 and the inner wall of the exhaust passage 808. The air-fuel mixture that blows back into the gap can be stopped. As a result, the air-fuel mixture remains as droplets on the cylindrical plate 800 and the central plate 801, and this residual air-fuel mixture is supplied in the next intake stroke, so that the combustion efficiency is further improved.
[0061]
【The invention's effect】
  As described above, in the invention according to claim 1, the fuel supplied by the fuel supply device is mixed with air.By arranging a plate having a large number of holes in the intake passage downstream of the fuel supply device so as to be substantially parallel to the flow direction of the intake air,Without lowering the flow velocity of the intake air flow, the atomization rate of the mixture can be further improved, combustion efficiency and fuel efficiency can be improved, and harmful components in the exhaust gas can be reduced. .In addition, since the size of the hole is large on the upstream side and small on the downstream side, the turbulent flow is further generated and atomized on the upstream side, and the air-fuel mixture blown back on the downstream side can be stopped. Also,Further turbulent flow is generated by the plate and atomized, and the fuel component of the air-fuel mixture remains as droplets in the holes of the plate by preventing blowback, and this residual air-fuel mixture is supplied in the next intake stroke. Since the air-fuel mixture atomized in stages is supplied, combustion efficiency is improved, fuel efficiency is improved, and harmful components in the exhaust gas can be reduced.
[0062]
  In the invention according to claim 2, the fuel supplied by the fuel supply device is mixed with air.By arranging a plurality of plates with a large number of holes along the direction of the intake air flow, the atomization rate of the air-fuel mixture can be further improved without reducing the flow velocity of the intake air flow. It is possible to improve combustion efficiency and fuel consumption, and to reduce harmful components in exhaust gas. Also, since the upstream plate and the downstream plate have large holes on the upstream side and small on the downstream side, more turbulence is generated on the upstream side and atomized, and the mixture that blows back on the downstream side is stopped. Can do. Also,A further turbulent flow is generated and atomized, and the fuel component of the atomized air-fuel mixture remains as droplets in the holes of the plate by preventing blowback, and this residual air-fuel mixture is supplied in the next intake stroke, Since the air-fuel mixture atomized in these two stages is supplied, the combustion efficiency is improved, fuel efficiency is improved, and harmful components in the exhaust gas can be reduced.
[0065]
  ClaimThreeIn the invention described in the above, regardless of the direction in which the intake passage is attached, the flow rate of the intake air flow is not reduced, the atomization rate of the air-fuel mixture can be further improved, and the combustion efficiency is improved and the fuel consumption is improved. In addition, harmful components in the exhaust gas can be reduced.
[0066]
  ClaimFourIn the invention described in the above, since the turbulent flow is further generated by the plates provided in the suction means such as the reed valve and the piston valve, the atomized mixture is directly supplied to the primary compression chamber of the intake air of the crank chamber. Combustion efficiency is improved and fuel efficiency is further improved. In addition, the fuel component of the air-fuel mixture atomized by preventing blowback remains as droplets in the holes of the plate, and this residual air-fuel mixture is supplied in the next intake stroke, so that the combustion efficiency is further improved, Harmful components in exhaust gas can also be reduced.
[0067]
  ClaimFiveIn the invention described in (4), the fuel component of the air-fuel mixture atomized by completely stopping the air-fuel mixture that blows back the plate having a large number of holes by the insulator disposed in the intake passage remains as droplets in the holes of the plate. Since the residual air-fuel mixture is supplied in the next intake stroke, the combustion efficiency is further improved and harmful components in the exhaust gas can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a two-cycle engine including an intake device.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a diagram for explaining the state of the air-fuel mixture flow.
FIG. 4 is a diagram showing a plate having a large number of holes.
FIG. 5 shows a plate having a large number of holes.
FIG. 6 is a diagram showing another arrangement of a plate having a large number of holes.
FIG. 7 is a longitudinal sectional view of a two-cycle engine provided with an intake device.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
FIG. 9 shows another arrangement of a plate having a large number of holes.
FIG. 10 is a cross-sectional view showing another embodiment of the reed valve.
FIG. 11 is a longitudinal sectional view showing another embodiment applied to a two-cycle engine.
FIG. 12 is a front view of an insulator.
13 is a cross-sectional view taken along line XIII-XIII in FIG.
14 shows an embodiment of a two-cycle engine, FIG. 14 (a) is a sectional view of the two-cycle engine, and FIG. 14 (b) is a sectional view taken along the line bb of FIG. 14 (a).
FIG. 15 is a side view of a two-cycle engine.
FIG. 16 is a cross-sectional view of a two-cycle engine.
FIG. 17 is a perspective view of a rotary valve.
FIG. 18 is a longitudinal sectional view of a 4-cycle engine provided with an intake device.
FIG. 19 is a longitudinal sectional view of a four-cycle engine including an intake device.
FIG. 20 is a longitudinal sectional view illustrating still another embodiment applied to a four-cycle engine.
[Explanation of symbols]
2 Crankcase
5 Crankshaft
6 Crank chamber
30a Intake passage
50 plates
50a1, 50a2 Hole in plate 50

Claims (5)

In an intake system for an engine having a fuel supply device for supplying fuel to the intake passage, a plate having a large number of holes is arranged substantially parallel to the flow direction of the intake air in the intake passage downstream of the fuel supply device. And
An intake device for an engine, wherein the hole has a large size on the upstream side and a small size on the downstream side . In an intake system for an engine having a fuel supply device for supplying fuel to the intake passage, a plurality of plates having a plurality of holes are provided in the intake passage downstream of the fuel supply device so as to be substantially parallel to the flow direction of the intake air. Place and
An intake device for an engine according to claim 1, wherein the upstream plate and the downstream plate have a large hole on the upstream side and a small size on the downstream side . A plurality of plates having a plurality of holes, wherein said substantially not parallel to along the flow direction of the intake air is located upstream and downstream, and placed by changing the mounting angle of a plurality of plates to each other The engine intake device according to claim 2. Said plate having a number of pores, an intake device for an engine according to any one of claims 1 to 3, characterized in that provided in the suction means disposed in the intake passage. It said plate having a number of pores, an intake device for an engine according to any one of claims 1 to 3, characterized in that provided in the insulator is disposed in the intake passage.

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