JPH0586910A - Intake system for multiple cylinder engine - Google Patents

Abstract

PURPOSE:To provide an intake device of a multiple cylinder engine, which can be formed compact with good layout, for supplying intake air equally to a plurality of branch intake ports of each cylinder, and for promoting generation of tumble in a combustion chamber. CONSTITUTION:A slide plate 14 is provided for four intake passages 10 on an air funnel 9 of each intake port 6 of four cylinders, in the direction crossing the direction of intake air inflow, in an integrated manner, so that the passage cross section of each of the four intake passage 10 of a bank 2 on one side of a V-type eight-cylinder engine E is changed. The slide plate 4 is slid in the abovementioned crossing direction and vertically to the alignment of the four intake passages 10, and when the slide plate 14 is at an upper limit point, the passage cross section will be minimum, while the passage cross section is enlarged from the upper limit point through downward movement. The intake port 6 is divided into two branch intake ports 6a, and is formed into a tumble port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for a multi-cylinder engine which changes a passage sectional area of an intake passage through a slide member which is arranged so as to be movable in a direction substantially orthogonal to an intake air inflow direction.

[0002]

2. Description of the Related Art Generally, a throttle valve interlocked with an accelerator pedal is provided in an intake passage of an engine, and the engine output can be adjusted by changing the opening of the throttle valve with the accelerator pedal. .. Generally, as the throttle valve, a butterfly valve type throttle valve including a disc-shaped valve body provided in an intake passage and a shaft member that rotatably supports the valve body is widely adopted. However, in this butterfly valve, since the shaft member is arranged transversely in the intake passage, even if the throttle valve is fully opened, the passage cross-sectional area is reduced by the area of the shaft member occupied in the intake passage, There is a problem that the intake resistance increases accordingly. Therefore, a slide plate that is movable in the arrangement direction of the intake pipes (hereinafter referred to as the front-rear direction) in a plane orthogonal to the intake air inflow direction is provided in the intake pipes that branch off for each intake port of each cylinder of the multi-cylinder engine, Partitions and openings are alternately provided in the slide plate in the front-rear direction so as to correspond to the intake pipes, and the slide plate is slid in the front-rear direction by an accelerator pedal to change the opening area of the openings in each intake pipe. A slide valve type throttle valve, which is designed to adjust the engine output, is being adopted. Further, in Japanese Utility Model Laid-Open No. 63-130644, a throttle body is provided in the middle of the intake pipe branched for each intake port of each cylinder, and the upper limit position and the passage disconnection where the passage sectional area becomes the largest in the throttle body. A slide valve type throttle valve that has a slide member that can move up and down over the lower limit position where the area is the smallest and that adjusts the engine output by sliding the slide member up and down with the accelerator pedal is described. Has been done.

[0003]

In the former slide valve type throttle valve, since the slide plate is moved in the front-rear direction, the length in the front-rear direction of the partition portion and the opening is at least in the front-rear direction of the intake passage. It is necessary to set the inner diameter more than each, the throttle valve becomes large in the front-rear direction, and the degree of freedom in assembling the throttle valve is greatly restricted. There is a problem that the tumble is difficult to form in the combustion chamber because the expansion direction of the opening area of the opening in the intake pipe is the front-back direction. Further, in an engine having a dual intake port in which the intake port of each cylinder is branched to the front and rear branch intake ports, there is a problem that the intake air amount to the front and rear branch intake ports becomes unbalanced and engine performance deteriorates. .. On the other hand, in the slide valve type throttle valve described in the above publication, a throttle valve is provided for each intake pipe, so that the structure thereof becomes complicated, and depending on the upward movement of the slide member from the lower limit position. Since the passage cross-sectional area increases from the lower side to the upper side of the intake passage, there is a problem that the amount of intake air to the outer peripheral portion of the curve of the intake port decreases and it is difficult to form tumble in the combustion chamber. ..

An object of the present invention is a multi-cylinder which can be compactly constructed with a good layout, can supply intake air evenly to a plurality of branch intake ports of each cylinder, and can promote the generation of tumble in the combustion chamber. It is to provide an intake device for an engine.

[0005]

According to a first aspect of the present invention, there is provided an intake system for a multi-cylinder engine, wherein an intake passage is provided in a branched intake pipe for each intake port of each cylinder in a direction substantially orthogonal to an intake inflow direction. In a multi-cylinder engine intake device including a slide member slidably arranged in the substantially orthogonal direction in order to change a passage cross-sectional area of the slide plate, the slide member is an integral slide plate for a plurality of intake passages. The slide plate is arranged so as to slide in a direction orthogonal to the arrangement direction of the plurality of intake passages.

An intake system for a multi-cylinder engine according to a second aspect is the intake system for a multi-cylinder engine according to the first aspect, wherein the intake port is branched into a plurality of branch intake ports. Is.

An intake system for a multi-cylinder engine according to claim 3 is the intake system for a multi-cylinder engine according to claim 1 or 2, wherein the branch portions of the plurality of branch intake ports for each of the cylinders are provided. It is characterized by being provided with an injector for fuel injection for supplying fuel.

An intake system for a multi-cylinder engine according to a fourth aspect is the intake system for a multi-cylinder engine according to the first or second aspect, wherein the intake port on the downstream side of the slide plate is a tumble port. The slide plate is configured such that the passage cross-sectional area is set to a minimum at the upper limit position and the passage cross-sectional area is enlarged in accordance with the downward movement from the upper limit position.

[0009]

In the intake system for a multi-cylinder engine according to the first aspect, the passage cross-sectional area of the intake passage is changed by arranging in a branched intake pipe for each intake port of each cylinder in a direction orthogonal to the intake inflow direction. For this reason, the slide member slidably arranged in the substantially orthogonal direction is constituted by an integral slide plate for a plurality of intake passages, and the slide plate is slid in a direction orthogonal to the arrangement direction of the plurality of intake passages. Since the passage cross-sectional area of the intake passage is changed, the slide plate can be made compact in the arrangement direction of the intake passages, and a plurality of intake passages can be made compact in the arrangement direction, thus making the intake device compact as a whole. Can be configured.

In the intake system for a multi-cylinder engine according to claim 2, the same operation as in claim 1 is obtained, but the intake port branches into a plurality of branch intake ports, and normally, the branch intake port is provided for each cylinder. Since they are provided in parallel so as to be branched in the arrangement direction of the intake passages, it is possible to set the intake air amounts to the plurality of branch intake ports of each cylinder in a well-balanced and substantially equal manner.
Combustibility can be improved.

In the intake system for a multi-cylinder engine according to a third aspect of the present invention, the same effect as that of the second aspect can be obtained, but for fuel injection for supplying fuel to the branch portions of the plurality of branch intake ports for each cylinder. Since it is equipped with an injector, the intake air that has been supplied to the multiple branch intake ports of each cylinder in a well-balanced manner promotes vaporization and atomization of the fuel supplied to the branch parts, and Deposits can be prevented and flammability can be improved.

In the intake system for a multi-cylinder engine according to claim 4, the same operation as that of claim 1 or 2 is obtained, but the intake port on the downstream side of the slide plate is formed as a tumble port, and the slide plate is provided. Is set to minimize the passage cross-sectional area at its upper limit position,
Since the passage cross-sectional area is enlarged according to the downward movement from the upper limit position, the intake flow rate to the outer peripheral side portion of the curve of the intake port at the time of partial load can be increased to promote the formation of tumble in the combustion chamber. ..

[0013]

The following effects can be obtained as described in the above section. According to the intake device for a multi-cylinder engine according to claim 1, the slide plate is sucked with a simple configuration in which the slide plate is slid in a direction orthogonal to the arrangement direction of the plurality of intake passages to change the passage cross-sectional area of the intake passage. In addition to being compact in the arrangement direction of the passages, a plurality of intake passages can also be made compact in the arrangement direction, and the intake device can be made compact as a whole.

According to the intake system for a multi-cylinder engine according to claim 2, the same effect as that of claim 1 can be obtained, but the intake port branches into a plurality of branch intake ports, and normally the branch intake ports are provided in each cylinder. Since the intake passages are branched in parallel in the arrangement direction of the respective intake passages, the intake air amounts for the plurality of branch intake ports of each cylinder can be set in a well-balanced manner and the combustibility can be improved.

According to the intake system for a multi-cylinder engine of claim 3, the same effect as that of claim 2 can be obtained, but for fuel injection for supplying fuel to the branch portions of the plurality of branch intake ports for each cylinder. Since it is equipped with an injector, the intake air supplied to the multiple branch intake ports of each cylinder in good balance promotes vaporization and atomization of the fuel supplied to the branch parts, and The deposit can be prevented and the flammability can be improved.

According to the intake system of the multi-cylinder engine of the fourth aspect, the same effect as that of the first or second aspect can be obtained, but the intake port on the downstream side of the slide plate is formed as a tumble port and slides. Since the plate is configured to expand the passage cross-sectional area in accordance with the downward movement from the upper limit position, the intake flow rate to the outer peripheral side portion of the curve of the intake port at the time of partial load is increased to increase the tumble in the combustion chamber. Can promote formation.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is a case where the present invention is applied to an intake device of a V8 cylinder engine for racing. Figure 1
As shown in FIG. 5, the intake device of the V-type 8-cylinder engine E will be described. Four cylinders 3 are provided in parallel in the front-rear direction at predetermined intervals in the left and right banks 2 of the cylinder block 1. An intake port 6 and an exhaust port 7 that open into the combustion chamber 5 of each cylinder 2 are provided in the left and right parts of the head 4, respectively, and the intake port 6 has an upstream part in a pair of front and rear branch intake ports 6a. In addition to being a dual intake port that is branched, it is formed as a tumble port that extends in a substantially straight shape with almost no bending (see FIGS. 5 and 6). A body 8 is provided over substantially the entire length thereof, and four air funnels 9 extending to the outside of the engine E are provided on the throttle body 8 at four intake ports 6, respectively. Each throttle body 8 is internally provided with a throttle valve 11 for changing passage cross-sectional areas of four intake passages 10 connected from the air funnel 9 to the intake port 6, and is provided at a lower part of the middle of the air funnel 9. An injector 12 is attached to the upper part of the upstream end of the air funnel 9.

Next, the throttle valve 11 will be described. Since the throttle valves 11 installed in the left and right throttle bodies 8 have the same structure, the left throttle body 8 will be described.
I will explain the interior. As shown in FIGS. 1 to 5, an accommodation space 13 is provided between the throttle body 8 and the cylinder head 4, and an accommodation space 13 is provided in an upper portion of the accommodation space 13.
A flat plate-shaped slide plate 14 extending in the front-rear direction over the two intake ports 6 is mounted in a substantially airtight manner, and the slide plate 14 is mounted in a substantially vertical direction (in a direction orthogonal to the intake inflow direction and 4 intake passages 1
It is mounted so that it can slide in the direction 0 and the direction orthogonal to it.
In the upper half of the slide plate 14, there are four intake ports 6 each having an oval opening 15 which is substantially the same as the upstream end of the intake ports 6.
The slide plate 14 has a lower half portion which is formed so as to correspond to the partition portion 14 and is capable of substantially fully closing the upstream end portion of the intake port 6.
a is formed, a pair of front and rear link mechanisms 16 is provided in the lower portion of the accommodation space 13, and the slide plate 14 has a partition portion 14a in which the upstream end portions of the four intake ports 6 are substantially closed. The upper limit position shown in the figure and the lower limit position shown in FIG. 4 in which the four openings 15 match the upstream ends of the four intake ports 6 are supported by the link mechanism 16 so as to be vertically movable. There is.

Each of the link mechanisms 16 is provided with a pair of upper and lower link plates 18 and 19 rotatably connected via a pin member 17 oriented in the left-right direction, and the upper link plate 18 is the lower end portion of the slide plate 14. The lower link plate 19 has a lower end portion rotatably connected to a lower portion of the throttle body 8. The front and rear pin members 17 penetrate the rear wall portion of the throttle body 8 and extend rearward. The operation plate 20 is connected to the rod 20, and the rear end portion of the operation rod 20 is interlockingly connected to an accelerator pedal via a link member (not shown). The slide plate 14 is constantly urged to the upper limit side via a spring member (not shown). When the accelerator pedal is depressed, the operation rod 20 moves forward according to the amount of depression, and the slide plate 14 moves downward via the link mechanism 16. Is dynamic aperture 15 is the intake passage 10
And the passage cross-sectional area of the intake passage 10 is enlarged from the upper side to the lower side.

Next, the operation of the intake device will be described. Since the passage cross-sectional area of the intake passage 10 is changed by sliding the slide plate 14 in the vertical direction, the throttle valve 11 and the throttle body 8 are moved in the front-back direction (intake passage 10
In addition, the four intake passages 10 can be made compact in the front-rear direction, and the intake device can be made compact as a whole. The downward movement of the slide plate 14 expands the passage cross-sectional area from the upper side to the lower side of the intake passage 10. Therefore, as shown in FIGS. 5 and 6, the branch intake ports branched before and after each intake port 6 are provided. 6a, a substantially equal amount of intake air (air mixture) can be supplied to the 6a, and as shown in FIG. 1, the intake air amount to the upper portion of the intake port 6 (the curved outer peripheral side portion) at the time of partial load is increased. The formation of tumble in the combustion chamber 5 can be promoted, and the combustibility can be greatly improved.

As described above, the throttle valve 11 and the throttle body 8 can be made compact in the front-rear direction, and the four intake passages 10 can be made compact in the front-rear direction, so that the intake device can be made compact as a whole. It is possible to supply substantially the same amount of intake air to the branch intake ports 6a of each intake port 6 in good balance, and increase the intake air amount to the upper portion of the intake port 6 at the time of partial load to form tumble in the combustion chamber 5. It can be promoted and the combustibility can be greatly improved, and other effects can be obtained.

Next, a modified example of the intake device will be described with reference to FIGS. The same members as those in the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted. Explaining this intake device, a portion of the cylinder head 4 on the intake port 6 side is provided so as to project outward, and a side wall portion of the cylinder head 4 on the intake port 6 side has a throttle body 8A over substantially its entire length. The throttle body 8A is provided with four air funnels 9A extending outward of the engine E in correspondence with the four intake ports 6, and both throttle bodies 8A are provided with the air funnels 9A to 6A. The throttle valve 11A for changing the passage cross-sectional areas of the four intake passages 10A connected to the cylinder head 4 is provided in the cylinder head 4 with two injection ports capable of injecting fuel toward the branch intake ports 6a before and after each intake port 6. The injector 12A which it has is attached.

Inside the throttle body 8A, a slide plate 1 made of a flexible member made of carbon fiber or the like and extending in the front-rear direction over the four intake ports 6 is formed.
4A is mounted in an airtight manner, a slide plate 14A is movably provided in the vertical direction through a bearing (not shown), and an intake passage 10A is provided above the slide plate 14A.
A substantially circular opening 15A having the same diameter as that of the slide plate 1 is formed in the upper and lower portions of the throttle body 8A.
The upper end of 4A is fixed to the upper shaft member 21, and the lower end of the slide plate 14 is fixed to the lower shaft member 22,
The upper shaft member 21 is biased in the winding direction of the slide plate 14 via a spring member (not shown), and the lower shaft member 22 includes a pair of gears 23 and 24, a lever member 25, a link rod 27, and the like. When the link rod 27 is moved in the direction of the arrow by depressing the accelerator pedal, the lever member 25 and the gear 23.
The lower shaft member 22 is rotated in the direction of the arrow via 24, the slide plate 14A is wound around the lower shaft member 23, and the opening 15A moves to the intake passage 10A side. The cross-sectional area of the passage is enlarged from the bottom to the bottom. The shaft member 22 may be directly driven to rotate by an electric motor that is rotated by a predetermined angle according to the operation amount of the accelerator pedal. Also, the upper and lower shaft members 21, 2
2 may be configured to be driven to rotate synchronously via a pair of gears. In the intake device, the same effects as those of the above-described embodiment can be obtained, the throttle body 8A can be downsized, and the branch intake ports 6 before and after each intake port 6 can be obtained.
The intake air that has flown into a in a well-balanced manner promotes vaporization and atomization of the fuel injected from the injector 12A,
It is possible to prevent the fuel from being deposited on the branch intake port 6a and improve the combustibility.

In this embodiment, a racing type V is used.
Although the present invention is applied to the type 8-cylinder engine E, the V-type multi-cylinder engine and the in-line multi-cylinder engine having a general configuration including an air cleaner and a surge tank are also provided at the middle or downstream end of the intake manifold. The present invention can be similarly applied by providing the throttle body.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an engine.

2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an operation explanatory diagram when the throttle valve is fully closed.

FIG. 4 is an operation explanatory diagram when the throttle valve is fully opened.

FIG. 5 is a perspective view of an intake passage.

FIG. 6 is a plan view of an intake port.

FIG. 7 is a view corresponding to FIG. 1 of an intake device according to a modification.

8 is a sectional view taken along line 8-8 of FIG.

FIG. 9 is a view corresponding to FIG. 6 of an intake device according to a modification.

[Explanation of symbols]

 E Engine 3 Cylinder 6 Intake port 6a Branch intake port 9.9A Air funnel 12 / 12A Injector 14 / 14A Slide plate

Claims (4)

[Claims] 1. An intake pipe, which is branched for each intake port of each cylinder, is arranged in a direction substantially orthogonal to the intake inflow direction, and is slidable in the substantially orthogonal direction so as to change the passage cross-sectional area of the intake passage. In an intake system for a multi-cylinder engine including a slide member provided, the slide member is configured as an integral slide plate for a plurality of intake passages, and the slide plate is arranged in an arrangement direction of the plurality of intake passages. An intake system for a multi-cylinder engine, which is arranged so as to slide in an orthogonal direction. 2. The intake system for a multi-cylinder engine according to claim 1, wherein the intake port branches into a plurality of branch intake ports. 3. The intake system for a multi-cylinder engine according to claim 2, further comprising an injector for injecting fuel to supply fuel to the branch portions of the plurality of branch intake ports for each cylinder. .. 4. The intake port on the downstream side of the slide plate is formed as a tumble port, and the slide plate has a passage cross-sectional area set to a minimum at an upper limit position thereof, and the passage is adapted to move downward from the upper limit position. The intake system for a multi-cylinder engine according to claim 1 or 2, wherein the intake system is configured to have an enlarged cross-sectional area.