JP3498337B2 - Engine intake system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine intake device.

[0002]

2. Description of the Related Art Conventionally, in automobile engines,
Two independent intake passages are provided for each cylinder, and a shutter valve is provided in one of the two independent intake passages. While the intake air is introduced, the shutter valve is closed and the intake air is introduced from only one of the independent intake passages at the time of low load operation, thereby maintaining the intake flow velocity and ensuring swirl generation.

In this case, as disclosed in Japanese Unexamined Patent Publication No. 4-124427, it is necessary to simultaneously switch the intake air intake mode of each cylinder according to the operating state of the engine. It is customary to attach a shutter valve for each cylinder via the above, and thereby realize simultaneous operation of each shutter valve.

[0004]

However, as disclosed in the above-mentioned publicly known examples, in the conventional intake system, the height position of each independent intake passage of each cylinder at the shutter valve mounting position is set to be the same. Therefore, the valve shaft penetrates not only each independent intake passage where the shutter valve is provided but also each independent intake passage where the shutter valve is not provided in the radial direction. In each of the independent intake passages that are not provided, there is a problem that the intake resistance increases due to the valve shaft penetratingly arranged in the radial direction.

Therefore, in the present invention, in an intake system of an engine in which a plurality of independent intake passages are provided for each cylinder and a shutter valve is provided in one of the independent intake passages, intake resistance due to a valve shaft can be reduced as much as possible. In addition, the mounting rigidity of the surge tank in the V-type engine is also improved.

[0006]

As a concrete means for solving the above problems, the present invention according to claim 1 is provided with a plurality of independent intake passages which are independent of each other for each cylinder. In an engine intake system in which a plurality of independent intake passages are opened on a surge tank connection member extending in the cylinder arrangement direction, and a surge tank is connected via the surge tank connection member, for each cylinder , While offsetting the openings of the plurality of independent intake passages on the surge tank connection member in a direction orthogonal to the cylinder arrangement direction, whichever of the offset directions of the openings of the plurality of independent intake passages of each cylinder is offset. A shutter valve is arranged in each opening located on one side or the other side, and the shutter valve is directed toward the cylinder arrangement direction. Is characterized in that allowed each supported via a valve disposed shaft Jitanku connecting member.

According to the second aspect of the present invention, a plurality of independent intake passages, which are independent from each other for each cylinder, are extended from a pair of left and right banks that are arranged to face each other at a predetermined bank angle, and each bank is provided with the independent intake passages. A plurality of independent intake passages of each cylinder are opened on a surge tank connecting member extending in the cylinder arrangement direction, and a surge tank is connected through the surge tank connecting member. The plurality of independent intake passages extending from the respective cylinders of the bank extend in a mutually intersecting state on the upper side of the engine so that the respective surge tank connecting members are located above the respective independent intake passages extending from the other bank. The independent intake passages arranged from these banks are connected to each other in the cylinder arrangement direction, while Respectively for each cylinder, causes offset in the direction orthogonal to the opening on said surge tank connecting members of the plurality of independent intake passage into the cylinder arrangement direction, of a plurality of independent intake passages of each respective cylinder of the respective openings A shutter valve is arranged in each opening located on either side of the offset direction, and each shutter valve is supported toward the cylinder arrangement direction via a valve shaft arranged in the surge tank connecting member. It is characterized by the fact that it is made.

According to the invention of claim 3, claim 1 or 2
The engine intake system described above is characterized in that the surge tank connection member is provided at the upstream end of a plurality of independent intake passages for each cylinder.

According to a fourth aspect of the invention, in the engine intake system according to the first, second or third aspect, the downstream end which is a connecting portion to the engine side of the plurality of independent intake passages for each cylinder is arranged in a cylinder arrangement. The feature is that they are arranged in a line in the direction.

[0010]

According to each invention of the present application, the following actions and effects are obtained by adopting such a configuration.

In the engine intake device according to the first aspect of the present invention, the openings on the surge tank connection member of the plurality of independent intake passages provided for each cylinder are offset in a direction orthogonal to the cylinder arrangement direction. A shutter via a valve shaft arranged in the surge tank connecting member in the cylinder arrangement direction at each opening located on either side of the offset direction among the openings of the plurality of independent intake passages. Since the valve is attached, the valve shaft is passed through only the independent intake passage provided with the shutter valve among the plurality of independent intake passages of each cylinder in a crossing state, and the other independent intake passages (that is, the shutter valve is It is possible to avoid an independent intake passage which is not provided. Therefore, in the independent intake passage in which the shutter valve is not provided, the penetration of the valve shaft does not hinder the intake flow. For example, the independent intake passage in which the shutter valve is not provided as in the above-mentioned known example. Compared with the case where the valve shaft also penetrates the passage, the intake resistance of the engine as a whole is reduced, and a higher level of intake efficiency is achieved.

Further, the openings on the surge tank connecting member of the plurality of independent intake passages for each cylinder are offset in the direction orthogonal to the cylinder arrangement direction so that the individual intake passages are also offset in the direction orthogonal to the passage direction. Therefore, for example, as compared with the case where the respective independent intake passages are not offset, the sectional performance in the direction orthogonal to the passage direction is improved, and the surge tank support rigidity is improved accordingly.

In the engine intake device according to the second aspect of the present invention, the openings on the surge tank connecting member of the plurality of independent intake passages provided for each cylinder of each bank are arranged in a direction orthogonal to the cylinder arrangement direction. In addition to offsetting, through a valve shaft arranged in the surge tank connecting member in the cylinder arrangement direction in each opening located on one side in the offset direction of each opening of the plurality of independent intake passages. In addition to providing the same operation and effect as described above in the V-type engine by installing the respective shutter valves, each surge tank connecting member has a plurality of independent intake passages extending from each cylinder of each bank. Extending above the engine so that they are located above the respective independent intake passages extending from the other bank in a mutually intersecting state Since the independent intake passages extending from these banks are continuous with each other in the cylinder arrangement direction, the independent intake passages of each bank are integrated to form one rigid body structure. The rigidity of each independent intake passage is improved compared to the case where each independent intake passage is discontinuous for each bank.
By extension, the supporting rigidity of the surge tanks mounted via the surge tank mounting members provided in the respective independent intake passages is improved, and the generation of noise due to the vibration of the surge tanks is prevented and the surge tanks themselves. The durability of is improved.

In the engine intake device according to the third aspect of the present invention, in addition to the above-described actions and effects, the surge tank connecting member is provided at the upstream end of the plurality of independent intake passages for each cylinder. Since it is provided, for example, as compared with the case where the surge tank connection member is arranged at the intermediate position of the independent intake passage, the effect of improving the sectional performance in the direction orthogonal to the passage direction due to the offset of each independent intake passage Is obtained in a larger range in the passage direction, and the surge tank support rigidity is further enhanced.

In the intake device for an engine according to a fourth aspect of the present invention, in addition to the above-described action and effect, the downstream end serving as a connecting portion to the engine side of the plurality of independent intake passages for each cylinder is provided. Since they are arranged in a line in the cylinder arrangement direction, the configuration of a plurality of intake ports provided for each cylinder on the engine side can be set to the same, for example, for each cylinder. In comparison with the case where the configurations of the plurality of intake ports are different from each other, the passage structure on the engine side is simplified and the intake valve provided in each intake port and the valve operating mechanism thereof can be commonly used. It will be promoted and eventually cost reduction will be possible.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The intake system for an engine of the present invention will be described below in detail with reference to the accompanying drawings. FIGS. 1 and 2 show an intake two-valve 6-cylinder V-type engine 1 according to an embodiment of the present invention. The intake system part is shown. This engine 1
The cylinder block 2 is constructed by tightening and fixing a pair of left and right cylinder heads 3A, 3B with a predetermined bank angle, and an intake manifold 4 to be described later is arranged between the banks.

The intake manifold 4 is shown in FIGS.
As shown in FIG. 3, the first intake passage group X ₁ corresponding to the first cylinder head 3A of the engine 1 and the second intake passage group X ₂ corresponding to the second cylinder head 3B are integrally formed. It is composed by connecting.

The first intake passage group X ₁ comprises a first independent intake passage 21 and a second independent intake passage 22 which are connected to two intake ports of each of the three cylinders belonging to the first bank. Three sets of intake passages 20 are arranged in a row in the cylinder arrangement direction. These first independent intake passages 21, 21,
21 and the respective upstream ends 21 of the second independent intake passages 22, 22, 22
a, 21a, 21a and 22a, 22a, 22a are respectively connected to the surge tank connection flange 17 (corresponding to the surge tank connection member in the claims) and open on the surge tank connection flange 17. Moreover, the downstream end 21
b, 21b, 21b and 22b, 22b, 22b are respectively connected to the cylinder head connecting flange 15 and open on the cylinder head connecting flange 15. Then, the cylinder head connecting flange 1 the first intake passage group X ₁
5 and the surge tank connecting flange 17 have a predetermined intersection angle, and therefore, when the cylinder head connecting flange 15 is abutted against the cylinder head 3A of the first bank, the intake passages 20, 20, 20 Extends obliquely upward from the first cylinder head 3A side toward the second cylinder head 3B side, and the surge tank connection flange 17 is directed toward the second cylinder head 3B side. In this embodiment, each of the above independent intake passages 2
The upstream ends 21a, 22a of 1, 22 correspond to the openings in the claims.

Further, in each of the intake passages 20, 20, 20, the upstream end 2 of the first independent intake passage 21 and the second independent intake passage 22 opening on the surge tank connecting flange 17 is provided.
1a and 22a are offset in the vertical direction (that is, the direction orthogonal to the cylinder arrangement direction) by a predetermined amount, while the downstream ends 21b and 22b opening on the cylinder head connecting flange 15 are arranged in a line along the cylinder arrangement direction. It is arranged. Therefore, as shown in FIGS. 1, 2 and 4, the first independent intake passage 21 and the second independent intake passage 22 have the same height at the downstream end portion thereof, but are on the upstream end side. The heights of the first independent intake passage 21 and the second independent intake passage 22 are relatively changed so that the first independent intake passage 21 is positioned higher than the second independent intake passage 22 as they approach each other.

The second intake passage group X ₂ has the same structure as the _first intake passage group X ₁ and has two intake ports for each of the three cylinders belonging to the second bank. First independent intake passage 24 and second independent intake passage 2 connected
The intake passages 23 and 5 are arranged in three sets in the cylinder arrangement direction through the respective intake passages 20, 20, 20 of the first intake passage group X ₁ . The first independent intake passages 24, 24, 24 and the upstream ends 24a, 24a, 24a of the second independent intake passages 25, 25, 25 and
5a, 25a, 25a are connected to a surge tank connecting flange 18 (corresponding to a surge tank connecting member in the claims) and open on the surge tank connecting flange 18,
Further, the downstream ends 24b, 24b, 24b and 25b, 25b,
25b is connected to the cylinder head connecting flange 16 and opens on the cylinder head connecting flange 16.
Further, the cylinder head connecting flange 16 and the surge tank connecting flange 18 of the second intake passage group X ₂ have a predetermined intersecting angle, and therefore the cylinder head connecting flange 16 is connected to the cylinder head 3 of the second bank.
When abutting against B, the intake passages 23, 23, 23 extend obliquely upward from the second cylinder head 3B side toward the first cylinder head 3A side, and the surge tank connecting flange 18 is It is directed toward the first cylinder head 3A side.

In each of the intake passages 23, 23, 23, the upstream end 2 of the first independent intake passage 24 and the second independent intake passage 25 opening on the surge tank connecting flange 18 is also provided.
4a, 25a are offset in the vertical direction (that is, the direction orthogonal to the cylinder arrangement direction) by a predetermined amount, while the downstream ends 24b, 25b opening on the cylinder head connection flange 16 are arranged in a line along the cylinder arrangement direction. It is arranged. Therefore, as shown in FIGS. 1, 2 and 4, the first independent intake passage 24 and the second independent intake passage 25 are at the same height in the portion near the downstream end thereof, but on the upstream end side. The heights of the first independent intake passage 24 and the second independent intake passage 25 are gradually changed relative to each other so that the first independent intake passage 24 is positioned higher than the second independent intake passage 25 as they approach each other.

Further, as shown in FIGS. 1, 3 and 5, the surge tank connecting flanges 17 and 18 of the intake passage groups X ₁ and X ₂ of the intake manifold 4 thus constructed are Each of the surge tank connection flanges 17,
18, first independent intake air passages 21, 21, 21 and upper independent open air intake passages 24, 24, 24
The valve shaft 31 is provided in a state of penetrating through the valve shaft 31, and the first independent intake passages 21, 21, 21 of the valve shaft 31 and the first independent intake passages 24, 24,
In the portion corresponding to 24, each of these first independent intake passages 2
Shutter valves 30, 30, ..., Which are respectively arranged in 1, 21, 21 and the first independent intake passages 24, 24, 24 are attached.

In this way, the first of the intake passages 20 and 23 is
The shutter valves 30, 30, ..., Which are arranged only in the first independent intake passages 21, 24 of the independent intake passages 21, 24 and the second independent intake passages 22, 25, are respectively provided in the intake passage groups X ₁ , X 2. _When supporting every _two valve shafts 31 by one, as in this embodiment, the shutter valve 3
0 is arranged in the first independent intake passages 21, 24 and the shutter valve 30 is not arranged in the second independent intake passages 22, 2.
5 and 5 are vertically offset, the valve shaft 31 can be provided so as to penetrate only the first independent intake passages 21, 24 without penetrating the second independent intake passages 22, 25. Therefore, the second independent intake passages 22, 2
On the fifth side, the intake resistance is reduced as much as the valve shaft 31 that serves as the intake resistance is not arranged so as to penetrate, and the intake efficiency is improved to promote higher engine output.

On the other hand, as described above, the first intake passage group X ₁ and the second intake passage group X ₂ which have substantially the same structure and are formed so as to intersect with each other by alternately interposing the respective intake passages 20 and 23. As shown in FIGS. 2 and 4, between the surge tank connection flange 17 and the surge tank connection flange 18, the first independent intake passage 21 and the second independent intake passage 21 of each intake passage 20, 20, 20 are provided. 22, and the first independent intake passage 24 and the second independent intake passage 25 of each intake passage 23, 23, 23 are sequentially connected in the cylinder arrangement direction. On the other hand, each surge tank connection flange 17,1
Since the intake passages 23, 23, 23 and 20, 20, 20 are arranged at predetermined intervals in a portion outside of 8 (that is, a portion near the downstream end), the intake passages 23, 23, 23 are And the intake passages 20, 2
Although a gap is generated in the portion between 0 and 20, in this embodiment, the frame-shaped portion 26 extending in the cylinder arrangement direction is provided in each of the intake passages 20, 20, ..., 23, 23 ,. By forming each of them continuously, they are closed. Therefore, the intake manifold 4 is
The intake passages 20, 20, 20 and the intake passages 23, 23, 2
The outer peripheral portion is surrounded by the three members of 3 and the frame-shaped portion 26.

Further, as shown in FIGS. 1 and 2, a flange portion 27 is formed on the front end portion of the frame-shaped portion 26 through a throat portion 28, and a partition rib 34 is formed at the rear end portion thereof. (See FIGS. 2 and 4) are formed.

In the intake manifold 4 thus constructed, as shown in FIGS. 1 and 2, the cylinder head connecting flanges 15 and 16 are connected to the cylinder heads 3A and 3B, respectively.
Is attached to the engine 1 side in a state where it is fastened from above to the engine 1 side, and the surge tank connection flanges 17, 1
Surge tanks 9 and 9 are connected to 8, respectively.

In this case, as described above, each intake passage 20, 20, 20 of the first intake passage group X ₁ and the second intake passage group X ₂
Since each of the intake passages 23, 23, 23 of the first intake passage group X ₁ side is formed integrally with the intake passages 23, 23, 23 in an intersecting state and continuous in the cylinder arrangement direction, for example,
0 and the respective intake passages 23, 23, ₂ on the side of the second intake passage group X ₂
The intake manifold 4 has a higher rigidity than a structure in which the intake manifold 4 and the surge tank 3 are separated from each other. Therefore, the surge tanks 9 and 9 supported by the intake manifold 4 also have a strong support rigidity, and It can be expected that the vibration noise of the tank 9 is reduced or the durability is improved.

On the other hand, in this embodiment, the bank portion of the engine 1 and the intake manifold 4 are arranged.
And the supercharger 5 is arranged between them. That is, the supercharger main body 6 of the supercharger 5 is located below the intake manifold 4 and the upper part thereof is covered by the intake manifold 4, and the drive pulley 7 located at the front end portion of the supercharger main body 6 is located. Is projected from the flange portion 27 toward the front of the engine. The portion of the pulley 7 is covered by the belt cover 11 which is fastened to the flange portion 27. In addition, as shown in FIGS. 2 and 4, the intake air intake portion 5a located at the rear end portion of the supercharger body 6 is taken out from the rear end of the intake manifold 4 and the rear side of the supercharger body 6 is removed. The partition ribs 34 are opposed to the ends. 1 and 2, reference numeral 5b is a supercharger 5
It is the intake and discharge part of.

When the supercharger 5 is arranged below the intake manifold 4 as described above, the supercharger body 6 of the supercharger 5 and the speed increasing gear portion 8 located at the front end portion of the supercharger body 6 are arranged.
However, above the intake manifold 4
The intake passages 20 and 23 are surrounded by the flange portion 27 on the front end side and further by the partition ribs 34 on the rear end portion, so that the supercharger 5 is operated. Noise, particularly operating noise from the speed-increasing gear unit 8, is prevented from leaking to the outside as much as possible, and there is an advantage that quieting of the engine is promoted.

Further, as shown in FIG. 1, the supercharger 5 is fixed on the side of the supercharger 5 with respect to the suspension supporting portions 29, 29 formed on both sides of the lower surface of the intake manifold 4. .. are made to abut against each other from below and are bolted to support the suspension. In this case, since the intake manifold 4 itself has a high rigidity as described above, the support rigidity of the supercharger 5 attached to the intake manifold 4 is also high, and the reliability of the attachment is improved.

In this embodiment, the V-type engine is targeted, but the present invention is not limited to this, and it goes without saying that it can be applied to the I-type engine.

In this embodiment, surge tank connecting flanges 17 and 18 are provided at the upstream ends of the independent intake passages 21 and 22 and 24 and 25, respectively, but the present invention is not limited to this. Instead, for example, the surge tank connecting flanges 17 and 18 are connected to the independent intake passages 21 and 2 respectively.
It can also be provided at an intermediate portion between 2 and 24, 25.

[Brief description of drawings]

FIG. 1 is a front view of an intake device for an engine according to an embodiment of the present invention.

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

FIG. 3 is a view on arrow III-III in FIG.

FIG. 4 is a vertical sectional view taken along the line IV-IV of FIG.

5 is a vertical cross-sectional view taken along line VV of FIG.

[Explanation of symbols]

1 is an engine, 2 is a cylinder block, 3A and 3B are cylinder heads, 4 is an intake manifold, 5 is a supercharger, 6 is a supercharger body, 7 is a pulley, 8 is a speed increasing gear part, 9 is a surge tank, 10 is an injector, 11 is a belt cover, 15 and 16 are cylinder head connecting flanges, 17 and 18 are surge tank connecting flanges, 20
Is an intake passage, 21 is a first independent intake passage, 22 is a second independent intake passage, 23 is an intake passage, 24 is a first independent intake passage,
Reference numeral 25 is a second independent intake passage, 26 is a frame portion, 27 is a flange portion, 28 is a throat portion, 29 is a suspension support portion, 30 is a shutter valve, 31 is a valve shaft, and 34 is a rib for partition wall.

Continuation of the front page (56) Reference JP-A-60-198321 (JP, A) JP-A-63-268967 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02B 31 / 00 331 F02M 35/10 F02M 35/116

Claims (4)

(57) [Claims] 1. A plurality of independent intake passages independent of each other are provided for each cylinder, and the plurality of independent intake passages are opened on a surge tank connecting member extending in the cylinder arrangement direction, and the surge tank connection is provided. in an intake device for an engine formed by connecting the surge tank through the member, respectively for each cylinder, it is offset in a direction orthogonal to the opening on the surge tank connecting members of the plurality of independent intake passage into the cylinder arrangement direction On the other hand, among the above-mentioned openings of the plurality of independent intake passages for each cylinder, a shutter valve is arranged at each opening located on one side in the offset direction, and the shutter valves are arranged in the cylinder arrangement direction. An engine characterized in that each of them is supported via a valve shaft arranged in the surge tank connecting member. Intake system of. 2. A plurality of independent intake passages, which are independent from each other for each cylinder, are extended from a pair of left and right banks that are arranged to face each other at a predetermined bank angle, and a plurality of independent cylinders are provided for each cylinder. In an intake system for an engine, in which intake passages are opened on respective surge tank connecting members extending in the cylinder arrangement direction, and surge tanks are connected via the surge tank connecting members, each cylinder of each bank is The plurality of independent intake passages extending from each other are arranged so as to intersect with each other on the engine upper side so that the respective surge tank connecting members are located above the respective independent intake passages extending from the other bank. while allowing continuous with each other in each independent intake passage cylinder arrangement direction extending from the bank, respectively for each cylinder above The openings on the surge tank connecting member of the number of independent intake passages are offset in the direction orthogonal to the cylinder arrangement direction, and one of the openings of the plurality of independent intake passages for each cylinder is in the offset direction. A shutter valve is arranged in each opening located on one side, and each shutter valve is supported in the cylinder arrangement direction via a valve shaft arranged in the surge tank connecting member. Intake device for the engine. 3. The intake system for an engine according to claim 1, wherein the surge tank connecting member is provided at an upstream end of a plurality of independent intake passages for each cylinder. 4. The method according to claim 1, 2 or 3, wherein the downstream ends of the plurality of independent intake passages for each cylinder, which are connecting portions to the engine side, are arranged in a line in the cylinder arrangement direction. Characteristic engine intake device.