JP3042193B2 - V-type engine exhaust recirculation 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 exhaust gas recirculation device for a V-type engine, and more particularly to a device for shortening the entire length of an exhaust gas recirculation pipe and easily securing a space for disposing an exhaust gas recirculation amount adjusting valve.
This can improve space efficiency and reduce weight and weight.
The present invention relates to an exhaust gas recirculation device for a V-type engine that can be made compact.

[0002]

2. Description of the Related Art Some engines are provided with an exhaust gas recirculation device for purifying exhaust gas. The exhaust gas recirculation device
By reducing a part of the exhaust gas to the intake air, NOx is reduced. Exhaust gas recirculation system
There is one disclosed in Japanese Patent Application Laid-Open No. 2-116159. In this publication, a cooling water pipe is provided in a space between cylinder banks on each side of a V-type engine, and a part of an exhaust gas recirculation passage is provided in the cooling water pipe.

[0003] The engine includes a series engine in which cylinder banks are arranged in series and a V-type engine in which cylinder banks are arranged in a V-shape, depending on the arrangement of cylinder banks. In the V-type engine, each side cylinder head is mounted on a substantially V-shaped cylinder block, and each side head cover is mounted on each side cylinder head, and each side cylinder bank is arranged in a V-shape. .

A V-type engine is disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2-238.
No. 128 is disclosed. In this publication, a surge tank portion of each intake manifold is disposed above each cylinder bank of a V-type engine, and a relative displacement of each cylinder bank in a direction of a crank axis is provided. A generator, which is an engine auxiliary machine, is arranged at a stepped portion generated above one of the cylinder banks of each side due to the displacement of each side surge tank portion due to the above.

[0005]

In a conventional exhaust gas recirculation system, for example, in an in-line engine,
In order to recirculate part of the exhaust gas to the intake air, an exhaust gas recirculation pipe is provided from the exhaust manifold to the intake pipe through the cylinder head, and an exhaust gas recirculation control valve (EGR) is provided in the exhaust gas recirculation pipe.
Valve).

However, the exhaust gas recirculation pipe extending from the exhaust manifold to the intake pipe through the cylinder head has a problem in that the length of the exhaust gas recirculation pipe is increased and the installation space is secured and the weight is increased. In addition, the exhaust gas recirculation amount adjusting valve provided in the middle of the exhaust gas recirculation pipe has a problem that it is difficult to secure an arrangement space. For this reason, there is a disadvantage that space efficiency is deteriorated,
There is a disadvantage of increasing the weight and increasing the size.

[0007]

SUMMARY OF THE INVENTION In order to solve such inconveniences, the present invention provides a throttle body and an intake manifold located on one side of a cylinder bank of a V-type engine at one end in the axial direction of the cylinder. In addition, an intake distribution pipe communicating with each side of the surge tank portion is disposed, and cooling water flowing out of each side cylinder head is located below the intake distribution pipe at one end in the cylinder axial direction of the V-type engine. In the V-type engine provided with the cooling water collecting pipe to be connected, the starting end side is connected to one end in the cylinder axial direction of one of the exhaust manifolds arranged on the outside of each of the cylinder banks, and Exhaust recirculation pipes connecting the end side to each side branch pipe of the intake manifold are provided,
An exhaust gas recirculation amount adjusting valve provided in the middle of the exhaust gas recirculation pipe is disposed so as to be located between the intake pipe and the cooling water collecting pipe at one end outside in the cylinder axis direction.

[0008]

According to the structure of the present invention, the exhaust gas recirculation pipe is connected to one end of each exhaust manifold in the axial direction of the cylinder, and communicates the end with the branch pipe of each intake manifold. The exhaust gas recirculation amount adjusting valve, which is provided on the way, is located between the intake distribution pipe and the cooling water collecting pipe arranged outside one end in the cylinder axial direction, so that the total length of the exhaust gas recirculation pipe is increased. Can be shortened, and a space for disposing the exhaust gas recirculation amount adjusting valve can be easily secured.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 to FIG. 3 show an embodiment of the present invention. In the figure, 2 is a V-type engine, 4 is a cylinder block, 6A and 6B are cylinder heads on each side, and 8A and
8B is a head cover on each side, 10A and 10B are cylinder banks on each side, 12 is a bearing cap, 14 is a crankshaft, and 16 is an oil pan.

In the V-type engine 2, the respective cylinder heads 6A and 6B are mounted on the substantially V-shaped cylinder block 4, and the respective head covers 8A and 8A are mounted on the respective cylinder heads 6A and 6B.
8B on each side of the cylinder bank 10A.
10B are arranged. A bearing cap 12 is attached to the lower part of the cylinder block 4 to
, And an oil pan 16 is mounted below the bearing cap 12.

The V-type engine 2 has a space 18 between the cylinder banks 10A and 10B arranged in a V-shape.
Is formed. The V-type engine 2 has a throttle body 20 that constitutes an intake system disposed above the space 18. The throttle body 20 is connected to an air cleaner by an intake pipe (not shown). One end of an intake distribution pipe 22 is connected to the throttle body 20. The other end of the intake distribution pipe 22 branches off and the respective surge tank portions 26A of the respective intake manifolds 24A and 24B are branched.
-Called 26B. As shown in FIG. 2, the intake distribution pipe 22 is disposed at a position slightly outside the one end in the direction of the cylinder axis C above each of the cylinder banks 10A and 10B.

Each of the surge tank sections 26A and 26B on each side
Are disposed above the respective head covers 8A and 8B of the respective cylinder banks 10A and 10B. One end side of each side branch pipe 28A / 28B is connected to each side surge tank portion 26A / 26B. Each side branch pipe 28A / 28B
Are provided so as to intersect with each other in the space portion 18 and to communicate with the other cylinders (not shown) of the respective cylinder banks 10A and 10B on the opposite sides.

Each of the cylinders of each of the cylinder banks 10A and 10B is provided with an exhaust manifold 30A and 30B of each side. Each side exhaust manifold 30A / 30B is
The respective cylinder banks 10A and 10B are disposed outside the respective cylinder heads 6A and 6B so as to be directed in the direction of the cylinder axis C.

The V-type engine 2 is located at a position slightly outside the one end in the direction of the cylinder axis C below the intake distribution pipe 22, and collects cooling water flowing out of the respective cylinder heads 6A and 6B. A collecting pipe 32 is provided. The cooling water collecting pipe 32 collects the cooling water flowing through the cylinder block 4 and flowing out of the respective cylinder heads 6A and 6B,
This is guided to a radiator by a cooling water pipe (not shown).

As described above, the V-type engine 2 is positioned outside the one end in the direction of the cylinder axis C above each of the cylinder banks 10A and 10B, so that the throttle body 20 and each of the intake manifolds 24A and 24B on each side are disposed. An intake distribution pipe 22 that communicates with the surge tank portions 26A and 26B is provided. The V-type engine 2 is provided with the intake distribution pipe 2.
2 Position one end outside the direction of the lower cylinder axis C,
A cooling water collecting pipe 32 for collecting the cooling water flowing out from each of the cylinder heads 6A and 6B is provided.

In such a V-type engine 2, the starting end is connected to one end in the direction of the cylinder axis C of one of the respective exhaust manifolds 30A and 30B disposed outside the respective cylinder banks 10A and 10B. And the branch pipes 28A of each intake manifold 24A / 24B.
An exhaust gas recirculation pipe 34 that communicates the terminal side to 28B is provided. An exhaust gas recirculation amount adjusting valve 36 is interposed in the exhaust gas recirculation pipe 34. The exhaust gas recirculation amount adjusting valve 36 is disposed between the intake distribution pipe 22 and the cooling water collecting pipe 32 at one end outside in the direction of the cylinder axis C of the V-type engine 2.

More specifically, as shown in FIG. 1, the exhaust gas recirculation pipe 34 is connected to the collective exhaust gas recirculation pipe 34-1 connected to the one-side exhaust manifold 30A by an exhaust gas recirculation amount adjusting valve 36 provided on the way. , Each side branch exhaust recirculation pipe 34-2A, 34-2B respectively connected to each side branch pipe 28A, 28B,
Is configured.

The exhaust gas recirculation amount adjusting valve 36 is provided on the extension of the space 18 between the cylinder banks 10A and 10B in the direction of the cylinder axis C in the direction of the cylinder axis C of the V-type engine 2. It is disposed between the pipe 22 and the cooling water collecting pipe 32.

The combined exhaust gas recirculation pipe 34 of the exhaust gas recirculation pipe 34
The reference numeral -1 denotes an exhaust gas return pipe having a start end connected to one end of the one-side exhaust manifold 30A in the direction of the cylinder axis C, and the other end positioned between the intake distribution pipe 22 and the cooling water collecting pipe 32. The flow control valve 36 is communicated. Exhaust gas recirculation pipes 34-2A and 34-2B on each side of the exhaust gas recirculation pipe 34
Is connected to the exhaust gas recirculation amount adjusting valve 36 on the starting end side, and the space 1 between the cylinder banks 10A and 10B on each side.
8 and extend in parallel with the direction of the cylinder axis C, and terminate on the side of each side branch pipe 28A of each intake manifold 24A / 24B.
We have contacted 28B each.

As described above, in the V-type engine 2, the exhaust recirculation pipe 34 connects the one end of the one-side exhaust manifold 30A in the direction of the cylinder axis C with the start end and communicates the end with the branch pipes 28A and 28B. The exhaust gas recirculation amount adjusting valve 36 provided in the middle is disposed between the intake distribution pipe 22 and the cooling water collecting pipe 32 disposed outside one end in the direction of the cylinder axis C. .

Accordingly, the exhaust gas recirculation pipe 34 is connected to one end of the one-side exhaust manifold 30A in the direction of the cylinder axis C on the starting end side and is connected to the branch pipes 28A and 28B on the end side, so that the exhaust gas recirculation pipe 34 has a total length. Can be shortened. In addition, since the exhaust gas recirculation amount adjusting valve 36 is disposed in an empty space between the intake distribution pipe 22 and the cooling water collecting pipe 32, an arrangement space can be easily secured.

As described above, since the entire length of the exhaust gas recirculation pipe 34 can be shortened, an installation space can be easily secured, and the space between the intake distribution pipe 22 and the cooling water collecting pipe 32 can be reduced. The exhaust gas recirculation amount adjusting valve 36 can be disposed for effective use. For this reason, this V-type engine 2 can improve space efficiency and can achieve weight reduction and compactness.

[0024]

As described above, according to the present invention, the total length of the exhaust gas recirculation pipe can be shortened, and the space for installing the exhaust gas recirculation amount adjusting valve can be easily secured. The exhaust gas recirculation amount adjusting valve can be provided by easily utilizing the space between the intake pipe and the cooling water collecting pipe. Therefore, the space efficiency of the V-type engine can be improved, and the weight and size can be reduced.

[Brief description of the drawings]

FIG. 1 is a rear view of a V-type engine showing an embodiment of the present invention.

FIG. 2 is a side view of a V-type engine.

FIG. 3 is a schematic front view of a V-type engine.

[Explanation of symbols]

 2 V-type engine 4 Cylinder block 6A / 6B Each side cylinder head 8A / 8B Each side head cover 10A / 10B Each side cylinder bank 12 Bearing cap 14 Crankshaft 16 Oil pan 18 Space 20 Throttle body 22 Intake pipe 24A / 24B Side intake manifold 26A / 26B Each side surge tank section 28A / 28B Each side branch pipe 30A / 30B Each side exhaust manifold 32 Cooling water collecting pipe 34 Exhaust recirculation pipe 36 Exhaust recirculation control valve

Continuation of front page (72) Inventor Katsumi Mizuno 300 Suzuki Corporation, Takatsuka-cho, Hamamatsu-shi, Shizuoka Prefecture (58) Field surveyed (Int.Cl. ⁷ , DB name) F02B 75/10 F02B 67/00 F02B 75 / 22 F01P 11/04 F02M 35/10 F02M 25/07

Claims (1)

(57) [Claims] An intake distribution pipe, which is located outside one end in the cylinder axial direction above each cylinder bank of a V-type engine and communicates a throttle body with each side surge tank of each side intake manifold, is provided. In the V-type engine, a cooling water collecting pipe for collecting cooling water flowing out from each side cylinder head is disposed outside the one end of the V-type engine in the cylinder axial direction below the intake distribution pipe, An exhaust gas recirculation pipe is provided that connects the start end to one end of each of the exhaust manifolds arranged on the outside of the bank in the cylinder axial direction and communicates the end to the branch pipes of the intake manifolds. An exhaust gas recirculation amount adjusting valve provided in the middle of the exhaust gas recirculation pipe is disposed between the intake pipe and the cooling water collecting pipe at one end outside in the cylinder axial direction. An exhaust gas recirculation device for a V-type engine.