JPH1193809A - Intake device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an atomization rate of an air-fuel mixture, improve combustion efficiency, improve fuel consumption, and reduce a toxic component in exhaust gas by arranging a plate having a large number of holes in an intake passage on the downstream side of a fuel supply device to supply fuel to the intake passage. SOLUTION: A plate 50 having a large number of holes 50a is arranged in a lead valve 7 arranged in an intake passage 30a on the downstream side of a carburetor 31 being a fuel supply device. Fuel supplied is mixed with air by the carburetor 31, but a valve 72 of the lead valve 7 is opened, and when air is sucked from a suction port 71, turbulence is generated further by a large number of holes 50a of the plate 50, and is atomized, and since an air-fuel mixture atomized in these two stages is supplied to a crank chamber 6, combustion efficiency is improved, and fuel consumption is also improved. A fuel component of the atomized air-fuel mixture remains as a droplet in the holes 50a of the plate 50, and since this residual air-fuel mixture is supplied at the next suction stroke, combustion efficiency is improved further.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an engine having a fuel supply device for supplying fuel to an intake passage.

[0002]

2. Description of the Related Art An engine mounted on a vehicle such as a motorcycle includes a two-cycle engine and a four-cycle engine, and these engines are provided with an intake device. Some of the intake devices include, for example, a fuel supply device that supplies fuel to an intake passage.

[0003]

In such an intake device, air and fuel are mixed and supplied. In order to improve the charging efficiency of the air-fuel mixture, for example, a rectifying plate or the like is provided in the intake passage. However, simply rectifying the air-fuel mixture with the rectifying plate did not sufficiently atomize the air-fuel mixture, nor did it sufficiently reduce harmful components in the exhaust gas.

The present invention has been made in view of such circumstances, and can improve the atomization rate of an air-fuel mixture, improve combustion efficiency and fuel efficiency, and further reduce harmful components in exhaust gas. It is an object of the present invention to provide an intake device for an engine.

[0005]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, there is provided an intake system for an engine having a fuel supply device for supplying fuel to an intake passage, wherein a plate having a large number of holes is arranged in the intake passage downstream of the fuel supply device. An intake device for an engine, characterized in that: ].

According to the first aspect of the present invention, the fuel supplied by the fuel supply device mixes with the air, but is further atomized by the turbulent flow generated by the plate having a larger number of holes. Since the air-fuel mixture atomized by the above is supplied, the combustion efficiency is improved, and the fuel efficiency is further improved. Also,
The fuel components of the atomized air-fuel mixture remain as droplets in the holes of the plate, and the remaining air-fuel mixture is supplied in the next suction stroke, so that the combustion efficiency is further improved and the harmful components in the exhaust gas are reduced. It can be reduced.

According to a second aspect of the present invention, there is provided an intake system for an engine according to the first aspect, wherein the plate having the plurality of holes is provided on a reed valve disposed in the intake passage. ].

According to the second aspect of the present invention, the plate provided on the reed valve of the two-stroke engine further generates a turbulent flow, and the atomized air-fuel mixture is directly transferred to the primary compression chamber of the intake air of the crank chamber. , The combustion efficiency is improved, and the fuel efficiency is further improved. Further, the fuel component of the atomized air-fuel mixture remains as droplets in the holes of the plate, and the remaining air-fuel mixture is supplied in the next suction stroke, so that the combustion efficiency is further improved and the harmfulness of the exhaust gas is reduced. The components can also be reduced.

According to a third aspect of the present invention, there is provided an engine according to the first or second aspect, wherein the plate having the large number of holes is arranged substantially parallel to a flow direction of the intake air. Intake device. ].

According to the third aspect of the present invention, it is possible to further improve the atomization rate of the air-fuel mixture without lowering the flow velocity of the flow of the intake air, thereby improving the combustion efficiency and the fuel efficiency. In addition, harmful components in the exhaust gas can be reduced.

According to a fourth aspect of the present invention, a plurality of plates having a large number of holes are located on the upstream side and the downstream side along the flow direction of the intake air, and the mounting angle between the plurality of plates is changed. 3. The intake device for an engine according to claim 1, wherein the intake device is arranged differently. ].

According to the fourth aspect of the present invention, the atomization rate of the air-fuel mixture can be further improved without reducing the flow velocity of the intake air flow regardless of the installation direction of the intake passage. It is possible to improve combustion efficiency and fuel efficiency, and also to reduce harmful components in exhaust gas.

According to a fifth aspect of the present invention, there is provided an intake system for an engine according to the fourth aspect, wherein the plurality of plates having a large number of holes are integrally formed by a single plate. ].

According to the fifth aspect of the present invention, the plurality of plates can be integrated and easily manufactured, and can be easily assembled to the intake passage.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intake device for an engine according to the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an embodiment applied to a two-stroke engine. FIG. 1 is a longitudinal sectional view of a two-stroke engine having an intake device, FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 4 is a view for explaining a state of a flow of an air-fuel mixture, and FIG. 4 is a view showing another arrangement of a plate having many holes.

The two-stroke engine 1 has a crankcase 2, which comprises an upper case 3 and a lower case 4. A crank shaft 5 is rotatably 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.

A cylinder block 7 is mounted on the upper case 3, and a cylinder head 8 is mounted on the cylinder block 7. A piston 10 is provided in the cylinder 9 formed in the cylinder block 80 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 mounted such that the ignition plug 12 faces the combustion chamber 11. The cylinder block 7 has three scavenging passages 13 communicating the crank chamber 6 and the combustion chamber 11 in a scavenging stroke, and an exhaust passage 14 for discharging exhaust gas from the combustion chamber 11 in an exhaust stroke. I have. Two scavenging passages 13 of the three scavenging passages 13 are arranged to face each other in the radial direction of the cylinder 9, and the remaining one scavenging passage 13 is connected to the two scavenging passages 13 facing each other. Between
It is arranged facing the exhaust passage 14.

At the top of the piston 10, two piston rings 15 are provided. A small end 21a 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 21b of the connecting rod 21 is mounted on a crank pin 23 of the crankshaft 5 by a bearing 24.
Are supported through the connecting rod 21.
The reciprocating motion of the piston 10 is converted into a rotary motion and transmitted to the crankshaft 5.

An intake pipe 30 is attached to the upper case 3 of the crankcase 2 via a reed valve 7.
Further, a carburetor 31 as a fuel supply device is connected to 0. The reed valve 7 has a suction port 71 formed in a body 70, and a valve 72 for opening and closing the suction port 71 and a valve stopper 73 are fastened together by screws 74. The valve 72 of the reed valve 7 opens during the intake stroke when the pressure in the crank chamber 6 becomes negative, and the air-fuel mixture is sucked from the intake passage 30 a of the intake pipe 30. As described above, the reed valve 7 is connected to the intake pipe 30.
Only the flow of the intake air flowing from the intake air to the crank chamber 6 is allowed, and the crank chamber 6 is used as a primary compression chamber of the intake air.

A plate 50 having a large number of holes 50a is arranged in the reed valve 7 arranged in the intake passage 30a downstream of the carburetor 31 as a fuel supply device.
The fuel supplied by the carburetor 31 mixes with air,
When the valve 72 of the reed valve 7 is opened and the air is suctioned from the suction port 71, as shown in FIG. 3, the turbulent flow is further generated by a large number of holes 50a of the plate 50 and atomized, and atomized in these two stages. Since the air-fuel mixture is supplied to the crank chamber 6, the combustion efficiency is improved, and the fuel efficiency is further improved. Further, the fuel component of the atomized air-fuel mixture remains as droplets in the holes 50a of the plate 50, and the residual air-fuel mixture is supplied in the next suction stroke, so that the combustion efficiency is further improved.

The plate 5 having a large number of holes 50a
Numeral 0 is provided in the reed valve 7 disposed in the intake passage 30a. The turbulent flow is further generated by the plate 50, and the atomized air-fuel mixture is directly supplied to the primary compression chamber of the intake air in the crank chamber 6. As a result, combustion efficiency is improved, fuel efficiency is further improved, and harmful components in exhaust gas such as carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxides (NO
x) can be reduced.

The plate 5 having a large number of holes 50a
0 may be arranged on the reed valve 7 as shown in FIG. 4, but the arrangement as shown in FIG. 1 and FIG. A flow can be created to atomize the mixture.

In this embodiment, the plate 50
Are arranged in parallel with the flow of the air-fuel mixture, but may be arranged so as to be orthogonal to the flow of the air-fuel mixture, or may be arranged to be inclined at a predetermined angle.

Next, an embodiment applied to a four-cycle engine will be described. FIG. 5 is a longitudinal sectional view of a four-stroke engine provided with an intake device.

A four-stroke engine 1 having a large number of cylinders
01 on the cylinder block 102
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 lower portion 104 of the head, and the intake passage 109 is formed by three branch passages 109a.
It is open to.

Each branch passage 10 of the intake passage 109
9 a is provided with an intake valve 112, and the mixture is supplied to the combustion chamber 107 by opening and closing the intake valve 112. An exhaust passage 115 is formed in the lower portion 104 of the head.
In 15, a pair of branch passages 115 a is open to the combustion chamber 107. An exhaust valve (not shown) is provided in the branch passage 115a, and exhaust gas is exhausted from an exhaust pipe (not shown) connected to the exhaust passage 115 by opening and closing the exhaust valve.

An intake pipe 110 is connected to the intake passage 109. The intake pipe 110 is provided with an injector 111 as a fuel supply device, and injects fuel at a predetermined timing. An ignition plug 150 is attached to the lower head portion 104 so as to face the combustion chamber 107.

A plate 60 having a large number of holes 60a is arranged in the intake passage 109 downstream of the injector 111 as a fuel supply device. In this embodiment, the plate 60 is arranged in parallel with the flow of the air-fuel mixture, but may be arranged so as to be orthogonal to the flow of the air-fuel mixture or may be arranged at a predetermined angle.

The fuel supplied by the injector 111 is mixed with air, but is further turbulently generated by the plate 60 having a large number of holes 60a and atomized, and the air-fuel mixture atomized in these two stages is supplied. Therefore, the combustion efficiency is improved, and the fuel efficiency is further improved. Further, since the fuel component of the atomized air-fuel mixture remains as droplets in the holes 60a of the plate 60, and this residual air-fuel mixture is supplied in the next suction stroke,
The combustion efficiency is further improved.

FIGS. 6 to 8 show another embodiment applied to a two-stroke engine. FIG.
FIG. 7 is a longitudinal sectional view of the cycle engine, FIG. 7 is a sectional view taken along line VII-VII of FIG. 6, and FIG. 8 is a view showing another arrangement of a plate having a large number of holes.

In this embodiment, the same components as those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, a large number of holes 200a,
A plurality of plates 200, 201 having 201a are located on the upstream side and the downstream side along the flow direction of the intake air, and are arranged at different mounting angles between the plurality of plates 200, 201. The downstream plate 200 is located at a position facing the suction port 71 of the reed valve 7, and the upstream plate 201 crosses the downstream plate 200 by approximately 45 degrees as shown in FIG. To change the mounting angle.

As described above, the plurality of plates 200, 201
Are arranged on the upstream side and the downstream side along the flow direction of the intake air, and are arranged by changing the mounting angle between the plurality of plates 200 and 201, regardless of the mounting direction of the intake passage 30a. It is possible to further improve the atomization rate of the air-fuel mixture without lowering the flow velocity of the flow, to improve the combustion efficiency and the fuel efficiency, and to further reduce harmful components in the exhaust gas, such as carbon monoxide (CO). ), Hydrocarbons (HC) and nitrogen oxides (NOx) can be reduced.

In this embodiment, the two upstream and downstream plates 200 and 201 are integrally formed by a single plate, so that they can be manufactured easily, and furthermore, they are connected to the intake passage 30a. Easy to assemble.

In the embodiment shown in FIG. 8, the downstream plate 200 is located at a position orthogonal to the suction port 71 of the reed valve 7, and the upstream plate 201 is substantially perpendicular to the downstream plate 200. The attachment angle is changed by crossing at 45 degrees, and the atomization rate of the air-fuel mixture can be further improved regardless of the attachment direction of the intake passage 30a without reducing the flow velocity of the intake air flow.

Next, an embodiment applied to a four-cycle engine will be described. FIG. 9 is a longitudinal sectional view of a four-stroke engine provided with an intake device.

In this embodiment, components similar to those in the embodiment shown in FIG. 5 are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, a large number of holes 300a,
A plurality of plates 300, 301 having 301a are located on the upstream side and the downstream side along the flow direction of the intake air, and are arranged at different mounting angles between the plurality of plates 300, 301. Irrespective of the mounting direction of the intake passage 30a, the atomization rate of the air-fuel mixture can be further improved without lowering the flow velocity of the intake air flow, thereby improving the combustion efficiency and the fuel efficiency, and further improving the exhaust gas. Harmful components in the gas, such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) can be reduced.

[0040]

As described above, according to the first aspect of the present invention, since a plate having a large number of holes is disposed in the intake passage downstream of the fuel supply device, the fuel supplied by the fuel supply device is air. Turbidity is further generated by the plate having a larger number of holes and atomized, and the air-fuel mixture atomized in the two stages is supplied, so that the combustion efficiency is improved and the fuel efficiency is further improved. . Further, the fuel component of the atomized air-fuel mixture remains as droplets in the holes of the plate, and the remaining air-fuel mixture is supplied in the next suction stroke, so that the combustion efficiency is further improved and the harmfulness of the exhaust gas is reduced. The components can also be reduced.

According to the second aspect of the present invention, a plate having a large number of holes is provided on the reed valve disposed in the intake passage. The fuel-air mixture is directly supplied to the primary compression chamber of the intake air in the crank chamber, so that the combustion efficiency is improved and the fuel efficiency is further improved. Also,
The fuel components of the atomized air-fuel mixture remain as droplets in the holes of the plate, and the remaining air-fuel mixture is supplied in the next suction stroke, so that the combustion efficiency is further improved and the harmful components in the exhaust gas are reduced. It can be reduced.

According to the third aspect of the present invention, it is possible to further improve the atomization rate of the air-fuel mixture without lowering the flow velocity of the flow of the intake air, thereby improving the combustion efficiency and the fuel efficiency. Harmful components in the exhaust gas can also be reduced.

According to the fourth aspect of the present invention, the atomization rate of the air-fuel mixture can be further improved without lowering the flow velocity of the intake air flow regardless of the mounting direction of the intake passage, and the combustion efficiency can be improved. It is possible to improve the fuel efficiency and the fuel efficiency, and it is also possible to reduce harmful components in exhaust gas.

According to the fifth aspect of the present invention, a plurality of plates can be integrated and easily manufactured, and can be easily attached to the intake passage.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a two-stroke engine including an intake device.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a diagram illustrating a flow state of an air-fuel mixture.

FIG. 4 is a view showing another arrangement of a plate having a large number of holes.

FIG. 5 is a longitudinal sectional view of a four-stroke engine including an intake device.

FIG. 6 is a longitudinal sectional view of a two-stroke engine including an intake device.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

FIG. 8 is a view showing another arrangement of a plate having a large number of holes.

FIG. 9 is a longitudinal sectional view of a four-stroke engine including an intake device.

[Explanation of symbols]

 2 Crankcase 5 Crankshaft 6 Crankcase 30a Intake passage 50 Plate 50a Hole in plate 50

Claims (5)

[Claims] 1. An intake system for an engine having a fuel supply device for supplying fuel to an intake passage, wherein a plate having a large number of holes is arranged in an intake passage downstream of the fuel supply device. Intake device. 2. The intake system for an engine according to claim 1, wherein the plate having the plurality of holes is provided on a reed valve arranged in the intake passage. 3. The intake system for an engine according to claim 1, wherein the plate having the plurality of holes is arranged substantially parallel to a flow direction of the intake air. 4. The method according to claim 1, further comprising:
The engine intake device according to claim 1, wherein the intake device is located on an upstream side and a downstream side along a flow direction of the intake air, and is arranged by changing a mounting angle between a plurality of plates. 5. The plurality of plates having a large number of holes,
5. The intake device for an engine according to claim 4, wherein the intake device is formed integrally by a single plate.