JPH10122036A - Exhaust gas recirculating device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the material of an intake manifold and the degree of freedom in its layout, and attain reduction in the number of parts by forming a groove formed with an exhaust gas flow passage at least on one side of the mating surfaces of a cylinder block and a cylinder head, and connecting the exhaust gas flow passage to an exhaust port through a control valve. SOLUTION: A cylinder head 13 is formed with an intake port 18 open to the side surface 13a on one side in its cross direction, and an exhaust port 19 open to the side surface 13b on the other side in the cross direction of the cylinder head 13. Grooves 23, 24 are formed, which correspond to mutual mating surfaces 12, 14 of a cylinder block 11 and the cylinder head 13. The grooves 23, 24 work together to form an exhaust gas flow passage 251 . The exhaust gas flow passage 251 is connected to the exhaust port 18 through a control valve and is communicated with the intake port 18 by a communicating passage 271 . The flow passage area of each communicating passage 271 for each cylinder is set so as to increase gradually as it separates from one end of the exhaust gas flow passage 251 running along the arrangement direction of each cylinder C1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cylinder head having an intake port and an exhaust port connected to an upper surface of a cylinder block, and a part of exhaust gas discharged from the exhaust port is guided to an intake port via a control valve. The present invention relates to an exhaust gas recirculation device for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, such an exhaust gas recirculation system is well known, for example, from Japanese Patent Publication No. 58660/1986.

[0003]

In the above-mentioned conventional exhaust gas recirculation system, the recirculated gas is introduced from a passage provided in the intake manifold to each intake port via an intake passage in the intake manifold. The exhaust gas is guided over a relatively long distance from the exhaust port to the intake port. However, in the recent internal combustion engine capable of lean combustion, the responsiveness of exhaust gas recirculation during lean combustion is emphasized, whereas in the above-described conventional configuration, the exhaust gas reaches the intake port from the exhaust port. The relatively long time leaves room for improvement in responsiveness. In addition, since the exhaust gas passage is provided in the intake manifold, there is a possibility that the material and layout of the intake manifold may be restricted.In addition, a pipe for guiding exhaust gas from the engine body to the intake manifold is required, and parts The score increases.

The present invention has been made in view of such circumstances, and it is possible to increase the degree of freedom in the material and layout of the intake manifold, reduce the number of parts, and improve the responsiveness of exhaust gas recirculation. An object of the present invention is to provide an exhaust gas recirculation device for an internal combustion engine as described above.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a cylinder head connected to an upper surface of a cylinder block is provided with a side surface on one side in the width direction of the cylinder head. An intake port that opens and an exhaust port that opens on the side surface on the other side in the width direction of the cylinder head are provided, and a part of exhaust gas discharged from the exhaust port is guided to the intake port via a control valve. In the exhaust gas recirculation device, at least one of the mating surfaces of the cylinder block and the cylinder head is provided with a groove that forms an exhaust gas passage between the cylinder block and the cylinder head, and the exhaust gas passage is connected to an exhaust port through a control valve. Connected and communicated with the intake port.

According to the structure of the first aspect of the present invention, since the exhaust gas flow passage is formed between the cylinder block and the cylinder head, it is not necessary to provide the exhaust gas passage in the intake manifold. The degree of freedom in the material and layout of the intake manifold can be increased, and the number of components such as pipes for guiding exhaust gas can be reduced. Further, since the distance for guiding the exhaust gas from the exhaust port to the intake port can be made relatively short, the time required for the exhaust gas to reach the intake port from the exhaust port can be shortened, and the responsiveness of exhaust gas recirculation can be improved.

According to the second aspect of the invention, the control valve includes:
By being attached to one of the cylinder block and the cylinder head in close proximity to the exhaust gas flow passage, the passage for guiding the exhaust gas can be further shortened, and the responsiveness of the exhaust gas recirculation can be further improved. Mounting rigidity can be increased.

According to the third aspect of the present invention, a plurality of cylinders are provided in parallel in the cylinder block, and one of the cylinders located closer to one side in the width direction of the cylinder head at a position corresponding to a specific one of the cylinders. A blow-by gas passage is provided in the portion, and a groove extending substantially along the arrangement direction of each cylinder while avoiding the blow-by gas passage on one side in the width direction of the cylinder head is provided on a mating surface of the cylinder head with the cylinder block, A plurality of communication passages are provided in the cylinder head to allow the exhaust gas flow passage formed between the groove and the cylinder block to communicate with the intake port corresponding to each cylinder, and a fastening portion for fastening the cylinder head to the cylinder block is provided. Different from the portion corresponding to the blow-by gas passage along the arrangement direction of the cylinders It provided one widthwise side of the cylinder head location.

According to the structure of the third aspect of the present invention, since the exhaust gas passage extends substantially along the direction in which the cylinders are arranged, a groove for forming the exhaust gas passage is provided. Therefore, it is possible to minimize an increase in the width of the cylinder head caused by the above. Even if the groove is formed so as to avoid the blow-by gas passage on one side in the width direction of the cylinder head, the fastening portion is arranged at a position different from the portion corresponding to the blow-by gas passage along the cylinder arrangement direction. In this way, it is possible to enhance the sealing performance of the exhaust gas flow passage and minimize the increase in the width of the cylinder head due to the provision of a fastening portion on one side in the width direction of the cylinder head for increasing the fastening force between the cylinder block and the cylinder head. Can be. Furthermore, since the exhaust gas flow passage communicates with the intake port via a communication passage provided in the cylinder head, the passage configuration can be simplified. The fastening portion is desirably provided at a substantially central portion of the cylinder head along the direction in which the cylinders are arranged, so that the sealing performance and the fastening force can be further improved.

According to the fourth aspect of the present invention, the flow area of each communication passage is set to be larger as the passage connected to the control valve is separated from the connection portion to the exhaust gas flow passage, so that the exhaust gas flows into each intake port. It is possible to distribute exhaust gas almost uniformly from the flow passage.

According to the fifth aspect of the present invention, a cylinder head coupled to an upper surface of a cylinder block in which a plurality of cylinders are provided in parallel is provided with an intake port opening on one side in the width direction of the cylinder head. An exhaust port opening on the other side in the width direction of the cylinder head is provided for each cylinder, and a part of exhaust gas discharged from at least one of the exhaust ports is controlled via a control valve. In an exhaust gas recirculation device for an internal combustion engine that is guided to each intake port, at least one of the mating surfaces of the cylinder block and the cylinder head, an exhaust gas passage connected to the exhaust port via a control valve is provided between the cylinder block and the cylinder head. The cylinder head is connected to the respective exhaust ports in the cylinder head. Communicating passage number is provided, in a part of the exhaust gas flow passage, a large vast chamber cross-sectional area is formed than the other part of the exhaust gas flow path.

According to the structure of the invention described in claim 5, the exhaust gas flow passage is formed between the cylinder block and the cylinder head, so that it is unnecessary to provide the exhaust gas passage in the intake manifold. The degree of freedom in the material and layout of the intake manifold can be increased, and the number of components such as pipes for guiding exhaust gas can be reduced. In addition, since the distance that the exhaust gas is guided from the exhaust port to the intake port can be made relatively short, the time required for the exhaust gas to reach the intake port from the exhaust port can be shortened, and the responsiveness of exhaust gas recirculation can be improved. Since an enormous chamber is formed in a part of the exhaust gas flow passage, pulsation of exhaust gas can be suppressed in the enormous chamber and guided to each intake port.

Further, according to the present invention, the volume of the gas passage from the enormous chamber to each intake port via each communication passage is set to be substantially equal, so that the gas passage can be freely arranged. The degree of distribution of exhaust gas to each intake port can be increased while increasing the degree.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an internal combustion engine, and is a sectional view taken along line 1-1 in FIG. 3, and FIG. 2 is a side view of the cylinder head viewed from the direction of the arrow 2, FIG. 3 is a bottom view as viewed from the direction of the arrow 3 in FIG. 2, FIG. 4 is an enlarged sectional view taken along the line 4-4 in FIG. 2, and FIG.
FIG. 6 is a cross-sectional view taken along line -6 of FIG. 2.

Referring first to FIGS. 1 to 3, this internal combustion engine is a multi-cylinder internal combustion engine, for example, a four-cylinder engine. A cylinder block 11 includes first to fourth cylinders C ₁ to C ₁ .
C ₄ is provided in parallel, the cylinder block 1
The mating surface 12 provided on the upper surface of the gasket 1 and the mating surface 14 provided on the lower surface of the cylinder head 13
5 are connected to each other.

The lower surface of the cylinder head 13 has a cylinder
Each cylinder C of block 11₁~ C _FourSliding fit on
Combustion chamber 16 between the top of a piston (not shown)
, For example, four concave portions 17 for forming
... are provided. The cylinder head 13 has
Side surface on one side in the width direction (horizontal direction in FIG. 1) of the magnetic head 13
13a and the cylinder head
Exhaust port opening on the other side surface 13b in the width direction of the door 13
19 ... and each cylinder C₁~ C_FourProvided in response to
One opening in the ceiling surface of the combustion chamber 16, that is, the recess 17.
A pair of intake valve ports 20, 20 communicate with each intake port 18.
And a pair of exhaust valve ports 21 and 21 opening in the recess 17
It communicates with the exhaust ports 19. Further cylinder head
A spark plug (not shown) is inserted into 13 and attached.
Plug mounting holes 22 are opened in the recesses 17.
It is provided so as to be spoken.

At least one of the mating surfaces 12 and 14 of the cylinder block 11 and the cylinder head 13, for example, both mating surfaces 12 and 14, have mutually corresponding grooves 23 and
24 is provided, which grooves 23 and 24 in cooperation form an exhaust gas flow passage 25 _1. The groove 23 provided on the mating surface 12 of the cylinder block 11 is formed shallower than the groove 24 provided on the mating surface 14 of the cylinder head 13, and the gasket corresponds to the opening edges of both grooves 23, 24. 15 has an opening 15a.

By the way, in a portion of its one widthwise side toward the cylinder head 13, the first to fourth cylinder C ₁
~C between specific cylinder mutual among _4, for example, first and second between the cylinder C _1, C _2, and the third and fourth
A pair of blow-by gas passages 26 are provided between the cylinders C ₃ and C ₄ . On the other hand, the exhaust gas flow passage 25 _1, the pair two sets of blow-by gas passage 26, 26 of the cylinder head 13
One widthwise side of the so formed as with avoided (upper side in FIG. 3) extending substantially along the arrangement direction of the cylinder C ₁ -C4, the cylinder head 13, the exhaust gas flow passage 25 ₁ to the cylinder C ₁ ~ A plurality of, for example, four communication passages 27 _1-2 communicating with the intake ports 18 corresponding to C _4.
7 ₄ is provided. In addition, one side of the cylinder head 13 in the width direction is
There is provided a fastening portion 28 having an insertion hole 29 through which a bolt (not shown) for fastening is inserted.
The fastening section 28, a position different from the portion corresponding to the blow-by gas passage 26, 26 along the arrangement direction of the cylinder C ₁ -C _4, for example, the second and third cylinder C
₂ , C _3, that is, each cylinder C ₁ -C
_It is provided on one side in the width direction of the cylinder head 13 at a substantially central position of the cylinder head 13 along the arrangement direction of ( ₄ ).

[0020] Referring also to FIGS. 4-6, the side surface of the one widthwise side of the cylinder head 13 on the outer side of the first cylinder C ₁ along the arrangement direction of the cylinder C ₁ -C ₄ in 13a, relatively close to the exhaust gas flow passage 25 ₁ is provided with a valve mounting seat 31, the control valve 32 is mounted by a plurality of bolts 33, 33 on the valve mounting seat 31.

Each cylinder C ₁ has a cylinder head 13.
A passage 34 communicating with one end of the exhaust gas flow passage 25 ₁ along the arrangement direction of the -C _4, an outlet hole 35 for communicating the other end to the passage 34 with allowed to open at one end to the valve mounting seat 31
Are provided to form, for example, a substantially L-shape. Meanwhile, the exhaust gas flow passage 25 _1, by the groove 23 and the cylinder head 13 side grooves 24 of the cylinder block 11 side, had a large becomes flow area than flow area of the passage 34 and Kakuren passage 27 _{1-27 4} are those formed as a relatively large large chamber _{volume, a 1 <a 2 <a} 3 when the flow area of each communicating passage 27 _{1-27 4} was a ₁ to a ₄ <a
Set to ₄ . That is, the flow areas A _{1 to} A ₄ of the communication passages 27 _{1 to} 27 ₄ are equal to the exhaust gas flow passage 25 _{1 of the} passage 34.
In this embodiment, the exhaust gas flow passages 25 ₁ along the direction in which the cylinders C _{1 to} C ₄ are arranged are separated from the connection portion to the exhaust gas passage 25 _1.
Are set so as to gradually increase as the distance from one end increases.

The cylinder head 13 has a valve mounting seat 31
And an inlet hole 36 having one end open to each of the cylinders C ₁ to C _1.
A passage 37 for communicating the other end of the middle portion inlet hole 36 extends along the _fourth arrangement direction, evacuating the inner end portion of the first cylinder C ₁ with communicating the intermediate portion to the inner end of the passage 37 A passage 38 communicated between the port 19 and the one outlet valve hole 21 is provided. Thus, each cylinder C
The outer end of the passageway 37 at the end of the cylinder head 13 along the arrangement direction of ₁ -C ₄ is closed by a cap 39,
The outer end of the passage 38 is closed by a cap 40 on the side surface 13 a on one side in the width direction of the cylinder head 13. Therefore an inlet hole 36 communicating through passages 38 and 37 to one of the exhaust ports 19 ..., to the control valve 32 is provided between the outlet hole 35 communicating with the exhaust passage 25 ₁ via the passage 34 becomes, by the operation of the control valve 32, a part of the exhaust gas derived from the exhaust ports 19 ... one is adjusting the flow rate guided to the exhaust gas flow passage 25 _1, the communication path from the exhaust gas flow passage 25 ₁ Each intake port 1 through 27 ...
8 ... respectively.

Next, to explain the action of this embodiment, the mating surface 12, 14 of the cylinder block 11 and the cylinder head 13, a groove 23, 24 to form an exhaust gas flow passage 25 ₁ is provided between each other, the exhaust gas Flow passage 2
5 ₁ By is connected to the exhaust port 19 ... one through the control valve 32, it is unnecessary to be provided to the intake manifold as a passage for guiding the exhaust gas prior art, free of materials and layout of the intake manifold In addition, the number of parts can be reduced by eliminating the need for a pipe or the like for guiding exhaust gas from the engine body to the intake manifold. Moreover, the distance that the exhaust gas is guided from the exhaust port 19 to the intake port 18 can be made relatively short, thereby shortening the time for the exhaust gas to reach the intake port 18 from the exhaust port 19 and providing a lean burn internal combustion engine. The required responsiveness of the exhaust gas recirculation can be improved, and the exhaust port 19 can be connected to the intake port 18.
.. Can be suppressed as much as possible, and carbon sticking due to the decrease in exhaust gas temperature in the control valve 32 does not occur.

Further, the control valve 32 is connected to the exhaust gas passage 25 ₁
, Is attached to the cylinder head 13 in close proximity to the passage, and further shortens a passage for guiding exhaust gas for recirculation,
The responsiveness of the exhaust gas recirculation can be further enhanced, and the rigidity of the control valve 32 can be increased.

The first and second cylinders C₁, C
_TwoAnd the third and fourth cylinders C_Three, C_FourBetween
Corresponding to each pair of blow-by gas
.. Are provided in the cylinder head 13.
On the other hand, the exhaust gas passage 25₁Is for each cylinder C₁~
It is formed so as to extend substantially along the arrangement direction of C4.
The exhaust gas passage 25₁Groove 24 for forming
Of the width of the cylinder head 13 caused by the provision of
It is possible to minimize the increase. Moreover, the groove 24
Each of the blow-by gas passages 26, 26.
Even if it is formed to avoid on one side in the width direction of 3,
The fastening portion 28 for fastening the cylinder C₁~ C _FourArray of
Correspond to the blow-by gas passages 26, 26,.
It is located at a different position from the
Increase in the width of the cylinder head 13 due to shaking
Can be suppressed as much as possible. This fastening portion 28
Flow passage 25₁Of the cylinder blow
To increase the fastening force between the lock 11 and the cylinder head 13.
For each cylinder C₁~ C_FourIn the array direction
A fastening portion 28 is provided at a substantially central portion of the cylinder head 13 along the same.
The sealing performance and the fastening force are further improved by
The layers can be raised.

Exhaust gas passage 25₁Is the cylinder head 1
Communication passage 27 provided in 3₁~ 27 _FourThrough the intake port
To the exhaust gas passage 2
5₁And simplify the passage configuration between the intake ports 18.
Can be

The further flow area of each communicating passage 27 _{1-27 4,} the exhaust gas flow passage 25 _first passage 34 leading to the control valve 32
Connection to, that is, by being set larger as it separates from one end of the exhaust gas flow passage 25 ₁ along the arrangement direction of the cylinder C ₁ -C4, each communication passage 27 ₁ to 27 ₄ from the exhaust gas flow passage 25 ₁ almost equalize the exhaust gas flow resistance of up to the intake ports 18 ... through, it is possible to substantially evenly distribute the exhaust gas to the intake ports 18 ... from the exhaust gas flow passage 25 _1.

The exhaust gas flow passage 25₁Is a cylinder blow
Provided on both the lock 11 and the cylinder head 13.
The passages 34 and the respective communication passages 27 are formed by the grooves 23 and 24.₁~
27 _FourOf capacity with a distribution area larger than the distribution area of
It is formed as a relatively large huge room and controls
Exhaust gas passage 25 via valve 32₁Exhaust gas introduced into
Even if pulsation occurs in the exhaust gas passage 25, which is a huge chamber,
₁Pulsation can be absorbed by
Control the fluctuation of the exhaust gas recirculation control amount
More precise control is possible.

FIG. 7 schematically shows a first modification of the exhaust gas flow passage.
FIG. _TwoIs connected to the control valve 32
One end of the common passage 41 and the other end of the common passage 41
The enormous chamber 42 that communicates with each other and branches off from the enormous chamber 42
Road 27₁~ 27_FourDistribution passages 43 connected to₁~ 4
3_FourThe enormous chamber 42 includes the exhaust gas flow passage 25_Twoof
Other parts: common passage 41 and distribution passage 43₁~
43_FourTo have a larger cross-sectional area than the cross-sectional area of
Is formed. Moreover, each distribution pass from the huge room 42
Road 43₁~ 43_FourAnd each communication passage 27₁~ 27_FourThrough
Each intake port 18 (see FIGS. 1 and 2)
Are set substantially equal. Ie each
Communication passage 27₁~ 27_FourWhen the volumes of
Passage 43 ₁~ 43_FourOf which the volume is set approximately equal
At this time, as shown in the first modification, each distribution
Road 43₁~ 43_FourDistribution area and length of each
Each distribution passage 43 may be set equally.₁
~ 43_FourThe distribution area and length of the
And each distribution passage 4 as shown in FIG.
3₁~ 43_FourSimple placement without complicating placement
It is also possible to

[0030] The first modification also can provide the same effects as in the above embodiment, the communication passage, especially suppressing the pulsation of the exhaust gas by large chamber 42 formed in the exhaust gas flow passage 25 ₂ 27 _{1-27 4} can be guided the exact amount of recirculated exhaust gas to the intake ports 18 from, yet from a large chamber 42 of the gas passage leading to the intake ports 18 ... through each communicating passage 27 _{1-27 4} By setting the volumes to be substantially equal, it is possible to increase the degree of freedom in arranging the gas passages and improve the distribution of the exhaust gas to the respective intake ports 18.

FIG. 8 schematically shows a second modification of the exhaust gas flow passage.
FIG. _ThreeIs connected to the control valve 32
A common passage 45 having one end continuous with an intermediate portion of the common passage 45
From the communication passage 27₁, 27_Two1st distribution through to
Road 46₁And the communication passage 2 from the other end of the common passage 45
7_Three, 27_FourDistribution passage 46 leading to_TwoConsisting of
Common passage 45 and both distribution passages 46₁, 46_TwoDistribution side of
The product is formed so as to have a huge chamber as a whole. Also
FIG. 9 is a schematic view showing a third modified example of the exhaust gas flow path,
This exhaust gas flow passage 25_FourIs connected at one end to the control valve 32
The first common passage 47 communicates with the intermediate portion.
And a second common passage 48,
From each communication passage 27₁~ 27_FourIs branched. Thus the first
And the circulation area of the second common passages 47 and 48
It is formed to be a huge room.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, the grooves for forming the exhaust gas passages 25 _{1 to} 25 ₄ may not be provided on the cylinder block 11 side, but may be provided only on the cylinder head 13 side. Further, the control valve 32 may be mounted on the cylinder block 11 side, and in this case, the mounting rigidity of the control valve 32 can be increased. Further, the present invention is applicable not only to a multi-cylinder internal combustion engine but also to a single-cylinder internal combustion engine.

[0034]

As described above, according to the first aspect of the present invention, it is unnecessary to provide a passage for guiding exhaust gas in the intake manifold, and it is possible to increase the degree of freedom in the material and layout of the intake manifold. In addition, the number of parts can be reduced by eliminating the need for pipes and the like that conduct exhaust gas, and the distance for conducting exhaust gas from the exhaust port to the intake port can be made relatively short, so that exhaust gas flows from the exhaust port to the intake port. The response time of the exhaust gas recirculation can be enhanced by shortening the time required for the exhaust gas recirculation.

Further, according to the second aspect of the present invention, it is possible to further shorten the passage for guiding the exhaust gas, to further enhance the responsiveness of the exhaust gas recirculation, and to increase the mounting rigidity of the control valve.

According to the third aspect of the present invention, since the exhaust gas passage extends substantially along the direction in which the cylinders are arranged, the cylinder for forming the exhaust gas passage is provided. It is possible to suppress an increase in the width of the head as much as possible, and also to suppress an increase in the width of the cylinder head due to the sealing performance of the exhaust gas flow passage and the fastening portion for increasing the fastening force of the cylinder block and the cylinder head, Further, the configuration of the passage between the exhaust gas passage and the intake port can be simplified.

According to the fourth aspect of the present invention, it is possible to distribute the exhaust gas from the exhaust gas flow passage to each intake port almost uniformly.

According to the fifth aspect of the present invention, it is not necessary to provide a passage for guiding exhaust gas in the intake manifold, so that the degree of freedom in the material and layout of the intake manifold can be increased, and a pipe or the like for guiding exhaust gas can be provided. The number of parts can be reduced as unnecessary, the exhaust gas can be guided from the exhaust port to the intake port relatively short, and the response of exhaust gas recirculation can be improved.Furthermore, exhaust gas pulsation can be suppressed in a huge chamber. To each intake port.

According to the sixth aspect of the present invention, it is possible to increase the degree of freedom in arranging the gas passages and improve the distribution of exhaust gas to each intake port.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an internal combustion engine, and is a sectional view taken along line 1-1 in FIG.

FIG. 2 is a side view of the cylinder head as viewed from a direction indicated by an arrow 2 in FIG.

FIG. 3 is a bottom view as viewed in the direction of arrow 3 in FIG. 2;

FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 2;

FIG. 7 is a schematic view showing a first modified example of the exhaust gas passage.

FIG. 8 is a schematic view showing a second modification of the exhaust gas passage.

FIG. 9 is a schematic view showing a third modified example of the exhaust gas flow passage.

[Explanation of symbols]

11 ... cylinder block 12, 14 ... mating surface 13 ... cylinder head 13a ... side surface on one side in the width direction of cylinder head 13b ... side surface on the other side in the width direction of cylinder head 18 ... intake ports 19 ... exhaust port 23, 24 ... grooves 25 _1, 25 _2, 25 _3, 25 ₄ ... exhaust gas flow passages 26 ... blow-by gas passage 27 _1, 27 _2, 27 _3, 27 ₄ ... communicating path 28 ... fastening section 32 ... control valve 34 ... passage 42 ... large chamber _{C 1, C 2, C 3} , C 4 ··· cylinder

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masatake Kanahiro 1-4-1 Chuo, Wako-shi, Saitama, Japan Honda R & D Co., Ltd.

Claims (6)

[Claims] An intake port (18) opening on a side surface (13a) on one side in the width direction of the cylinder head (13) is provided on a cylinder head (13) coupled to an upper surface of the cylinder block (11). An exhaust port (19) is provided on the other side (13b) in the width direction of the cylinder head (13), and a part of the exhaust gas discharged from the exhaust port (19) is supplied via a control valve (32). In an exhaust gas recirculation system for an internal combustion engine guided to an intake port (18), an exhaust gas flow passage (25 ₁ , 25 ₂ ) is provided in at least one of the mating surfaces (12, 14) of the cylinder block (11) and the cylinder head (13). , 25 ₃ , 25 ₄ ) are provided between the cylinder block (11) and the cylinder head (13).
_{1 to} 25 ₄ ) are connected to the exhaust port (1) through the control valve (32).
An exhaust gas recirculation device for an internal combustion engine, wherein the exhaust gas recirculation device is connected to 9) and is connected to an intake port (18). 2. The cylinder block (1), wherein the control valve (32) is close to the exhaust gas flow passages (25 _{1 to} 25 ₄ ).
2. The exhaust gas recirculation system for an internal combustion engine according to claim 1, wherein the exhaust gas recirculation system is mounted on one of the cylinder head and the cylinder head. 3. A cylinder block (11) comprising a plurality of cylinders.
(C₁~ C_Four) Are provided in parallel and their serial
(C₁~ C_Four) Of a specific cylinder (C₁,
C_TwoC_Three, C_Four) At the position corresponding to each other,
Blow-by gas at the portion of the pad (13) near one side in the width direction
A passage (26) is provided, and the blow-by gas passage (2) is provided.
6) on one side in the width direction of the cylinder head
Cylinder (C ₁~ C4) extends almost along the arrangement direction
The groove (24) is the cylinder block of the cylinder head (13).
The groove (14) is provided on the mating surface (14) to the lock (11).
(24) and formed between the cylinder block (11).
Exhaust gas passage (25₁) For each cylinder (C₁~ C_Four)
To communicate with the intake port (18) corresponding to
Number of communication paths (27₁~ 27_Four) Is the cylinder head (1
3), the cylinder block (11)
Fastening part (28) for fastening the head (13)
Is the cylinder (C₁~ C_Four) Along the array direction
Different from the part corresponding to the blow-by gas passage (26).
At one position in the width direction of the cylinder head (13).
An exhaust gas recirculation device for an internal combustion engine. _4. The flow area of each of the communication passages (27 _{1 to} 27 ₄ ) increases as the distance from the connection of the passage (34) connected to the control valve (32) to the exhaust gas flow passage (25 ₁ ) increases. The exhaust gas recirculation device for an internal combustion engine according to claim 3, wherein the device is set. 5. A plurality of cylinders (C)₁~ C_Four) In parallel
Connected to the upper surface of the cylinder block (11)
To the cylinder head (13)
3) Intake port opening on one side surface (13a) in the width direction
(18) and the other side in the width direction of the cylinder head (13).
An exhaust port (19) opening on the side surface (13b) of the
Each cylinder (C₁~ C_Four) Corresponding to each
From at least one of the exhaust ports (19).
A part of the exhaust gas is supplied to each intake port through the control valve (32).
(18), the exhaust gas recirculation of the internal combustion engine
In the apparatus, a cylinder block (11) and a syringe
At least the mating surfaces (12, 14) of the dahead (13)
On the other hand, through the control valve (32), the exhaust port (19)
Exhaust gas passage (25_Two) Cylinder block
(11) and the cylinder head (13)
Grooves (23, 24) are provided and the cylinder head (13)
The exhaust gas flow passage (25_Two) To each intake port (1
8) and a plurality of communication passages (27)₁~ 27
_Four) Is provided, and the exhaust gas flow passage (25) _Two),
Exhaust gas passage (25_Two) Larger cross-sectional area than other parts
Internal combustion characterized by the formation of a large chamber (42)
Engine exhaust gas recirculation system. 6. The communication path (27) extending from the huge chamber (42).
_{1-27 4)} exhaust gas recirculation apparatus for an internal combustion engine according to claim 5, wherein the volume of the gas passage leading to the intake ports (18), characterized in that it is set substantially equal through.