JP3048766B2 - Exhaust manifold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dividable exhaust manifold for supplying exhaust gas from a multi-cylinder engine to a supercharger or supplying exhaust gas to an exhaust pipe.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a configuration in which an exhaust manifold of a multi-cylinder engine can be divided is known. For example, the technique is described in JP-A-4-134119 and JP-A-4-6723.

[0003]

However, in the above-mentioned prior art, a seal ring is provided as an exhaust seal mechanism at a connecting portion of the divided unit exhaust manifolds.
It was constructed by inserting a bellows-shaped flexible pipe. As described above, in the case where a seal ring is inserted or a bellows-shaped flexible pipe is used, it is difficult to assemble the pipe and the cost is increased. In the present invention, the sealing mechanism of the portion is simply configured by interposing a heat-expandable gasket.

Further, in the conventional exhaust manifold divided configuration, the shape of each unit exhaust manifold is different from each other, and there is no structure that is compatible with left and right. In the present invention, by setting the dividing surface of the unit exhaust manifold to be exactly at the center position, even if the two unit exhaust manifolds on the left and right have exactly the same shape or are divided into a plurality of units, some of them are separated. It has a dual-purpose structure with compatibility.

[0005]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In claim 1, a multi-cylinder engine
Exhaust manifold with two unit exhaust manifolds
5 and the divided surfaces of the two unit exhaust manifolds 5
Is the central position of the entire exhaust manifold,
The unit exhaust manifold 5 is connected to the turbocharger side connection pipe at the center.
2 and the supercharger side connection pipe 2 is connected to the unit discharge
At the part connecting the gas manifold 5, the inlet 2L
2R and the left and right exhausts are inside the supercharger side connection pipe 2.
And merges before passing through the supercharger .

According to a second aspect, the exhaust gas according to the first aspect is provided.
In the manifold, two unit exhaust manifolds on the left and right
The left and right units are divided into two with the same shape of the field 5
By rotating the exhaust manifold 5 by 180 °,
It can be shared .

According to a third aspect of the present invention, the exhaust of a multi-cylinder engine is provided.
The air manifold is connected to the supercharger side connection pipe 2
A central exhaust manifold 7 and the central exhaust manifold 7
End exhaust manifolds 8.8 connected to the left and right
Separate the left and right end exhaust manifolds 8
By rotating, the left and right have the same configuration that can be shared,
The central exhaust manifold 7 is connected to the supercharger side connecting pipe 2.
A connection bracket 7c is provided.
7c to prevent exhaust interference from occurring inside
A split wall portion is formed outside the central exhaust manifold 7 side.
The cylinder 7a and the inner cylinder 8a on the side of the end exhaust manifold 8 are
Do not perform fastening and fixing with joining bolts, only the fitted state,
A cylindrical heat-expandable gasket between the outer cylinder 7a and the inner cylinder 8a
6 is fitted .

[0008]

Next, the operation will be described. According to the structure as claimed in claim 1, a long single exhaust manifold can be divided into a plurality of unit exhaust manifolds 5 as in the prior art, and a compact and simple structure can be achieved. In the manufacturing process, the production became extremely easy and the cost was reduced. In addition, by sharing the right and left, the shape of the casting becomes one type, and the cost can be reduced from this point as well.

According to the second aspect of the present invention, the left and right unit exhaust manifolds 5 are rotated by 180 degrees,
One entire exhaust manifold can be formed, and the turbocharger-side connecting pipe 2 can be connected to the divided surface in a T-shape, so that the connecting portion between the unit exhaust manifolds 5 is connected to the turbocharger-side connecting pipe. 2 can be reinforced.

According to the third aspect of the present invention, there is no need to fit a seal ring or connect with a flexible cylinder as in the prior art, and a simple seal configuration is achieved by fitting only the heat-expandable gasket 6. It can be. Also, since the heat-expandable gasket 6 expands,
The central exhaust manifold 7 and the end exhaust manifold 8 do not need to be fixed and fastened by bolts at the fitting portions. The expansion rates of the central exhaust manifold 7 and the end exhaust manifold 8 are different, and the joint surfaces of the two are displaced. Even if it does, it is possible to allow the displacement by sliding between the outer cylinder 7a and the inner cylinder 8a. In addition, since the heat-expandable gasket 6 expands and completely closes the gap between the outer cylinder 7a and the inner cylinder 8a, the gasket 6 can be completely sealed without fastening with bolts.

[0011]

Next, an embodiment will be described. FIG. 1 is an overall plan view of an exhaust manifold according to the present invention, FIG. 2 is a side view showing a connecting surface of a supercharger-side connecting pipe 2 shown in FIG. 1, and FIG. FIG. 4 is a view showing a state in which the divided unit exhaust manifold 5 is disassembled and a heat-expandable gasket 6 is taken out.

FIG. 1 and FIG. 2 will be described. An exhaust manifold is provided at the exhaust outlet of the cylinder head 1 of the engine. Conventional exhaust manifold have been used cast iron exhaust manifold that most over the length entire length of the cylinder head 1, slightly recently, the prior art
Thus, a divided exhaust manifold as described in the above-mentioned publication has been used.

The reason why the exhaust manifold is divided in this way is that, in recent years, in order to increase the horsepower of the engine, the turbocharger is often driven by the exhaust gas collected by the exhaust manifold. This is because, when the exhaust of the six-cylinder engine is supplied to the engine, there is a possibility that the exhaust may interfere with each other due to the order of the explosion and the exhaust of each cylinder. In order to prevent this exhaust interference, it is best to divide each of the three cylinders into another exhaust manifold system. Then, the exhaust of both systems is merged for the first time inside the supercharger.

If it is necessary to divide the inside of the exhaust manifold, even if it is divided into unit exhaust manifolds, there is no need to seal between the two with an airtight structure.
In terms of manufacturing, it is more advantageous to use a split configuration in terms of processing cost. 1 and 2 showing an embodiment of the present invention, a configuration in which a six-cylinder exhaust manifold is divided into left and right unit exhaust manifolds 5 is shown.

As shown in FIG. 2, the supercharger side connecting pipe 2
Is a part connecting the unit exhaust manifold 5 ,
Is divided to the flow inlet 2L · 2R, it passes through the interior of the turbocharger side connecting pipe 2, 3 for the left and right until entering the turbocharger
The exhaust from the cylinders is merged. With this configuration, no exhaust interference between the cylinders occurs. In addition, when supplying to the supercharger, the exhaust gas on both sides is merged in a parallel flow state at the supercharger side connecting pipe 2, so that no problem occurs in this case.

In the present invention, for these reasons,
The exhaust manifold is divided into two unit exhaust manifolds 5, and the divided surface has a length L at the center of the entire length of the exhaust manifold. The left and right unit exhaust manifolds 5 are exactly the same parts,
゜ By rotating, it can be used on either side as it is. And the unit exhaust manifolds 5 and 5
Are configured to be integrated by four joining bolts 4. The joining bolt 4 is also configured such that one unit exhaust manifold 5 is provided with an insertion hole and a threaded hole for the two joining bolts 4, and each of the two unit bolts 4 is alternately threaded. I have.

The bracket 2a of the supercharger-side connecting pipe 2 is in contact with the brackets 5a of the unit exhaust manifold 5 in a state of being joined by the joining bolts 4. In the joined state, two unit exhaust manifolds 5 and one turbocharger-side connecting pipe 2 are connected to each other by the four connecting bolts 3 fitted in the bolt holes 13 of the supercharger-side connecting pipe 2.
It is integrated while forming a character-shaped joining surface.

Next, the embodiment shown in FIGS. 3 and 4 will be described. In this embodiment, the exhaust manifold is divided into a central exhaust manifold 7 which is a joint to the supercharger-side connecting pipe 2 and end exhaust manifolds 8 connected to the left and right of the central exhaust manifold 7. Divided. Also in this case, the end exhaust manifolds 8 arranged at the left and right ends are provided.
Have the same configuration that can be used for both left and right, and can be used for both by rotating by 180 °. The central exhaust manifold 7 includes a connection bracket 7c for connecting to the supercharger-side connection pipe 2, and inside the connection bracket 7c, left and right divided walls are formed so as not to cause exhaust interference.

A branch pipe 7b provided in the central exhaust manifold 7 is connected to each exhaust outlet of the cylinder head 1. The end exhaust manifold 8 also has a diverter 8c.
And is fixed to the exhaust outlet of the cylinder head 1. The connection between the central exhaust manifold 7 and the end exhaust manifold 8 is made by simply fitting the outer cylinder 7a on the central exhaust manifold 7 side and the inner cylinder 8a on the end exhaust manifold 8 side, and joining the bracket part. No fastening with bolts. The tubular heat-expandable gasket 6 is fitted between the outer cylinder 7a and the inner cylinder 8a so that a sufficient airtight state can be maintained without performing the fastening and fixing.

The heat-expandable gasket 6 is obtained by mixing a ceramic fiber base material with a heat-expandable vermiculite mineral, and is made of a sheet made of an inorganic, organic and binder material. Since the expansion starts at a low temperature of about 275 degrees, it can be used as a heat insulating material or a sealing material for filling gaps.

[0020]

As described above, the present invention has the following advantages. The exhaust manifold of the multi-cylinder engine is divided into a plurality of parts, and the divided unit exhaust manifold 5 can be shared, so that a long single exhaust manifold can be used as in the prior art.
Since the structure was divided into a plurality of unit exhaust manifolds 5 and the structure was reduced in size and simple, the production was extremely easy in the casting manufacturing process, and the cost was reduced. In addition, by sharing the right and left, the shape of the casting is also one kind, and the cost can be reduced from this point as well. Also, the exhaust of multiple cylinders is supplied to the turbocharger.
When supplying, is there a relation between the order of explosion and exhaust of each cylinder?
The possibility of exhaust interference, in which exhausts interfere with each other
There was. Such exhaust between multiple cylinders
In the present invention, the interference between the left and right exhaust manifolds is reduced.
Divide the inside and connect the turbocharger side connecting pipe 2 to the supercharger.
Can be avoided by merging for the first time
It has become.

Since the exhaust manifold of the multi-cylinder engine is divided into two unit exhaust manifolds 5 and the divided surface is located at the center of the exhaust manifold, the left and right unit exhaust manifolds 5 , 180
One rotation of the exhaust manifold can constitute a whole exhaust manifold, and the supercharger-side connecting pipe 2 can be connected to the divided surface in a T-shape. It was possible to reinforce with the supercharger side connecting pipe 2.

According to a third aspect of the present invention, the exhaust manifold of the multi-cylinder engine is divided into a plurality of parts, a fitting connection portion is provided between each unit exhaust manifold 5, and a heat-expandable gasket 6 is fitted into the fitting connection portion. As described above, there is no need to fit a seal ring or connect with a flexible cylinder as in the related art, and a simple seal configuration can be achieved by fitting only the heat-expandable gasket 6. . Also, since the heat-expandable gasket 6 expands,
The central exhaust manifold 7 and the end exhaust manifold 8 do not need to be fixed and fastened by bolts at the fitting portions. The expansion rates of the central exhaust manifold 7 and the end exhaust manifold 8 are different, and the joint surfaces of the two are displaced. Even if it does, it is possible to allow the displacement by sliding between the outer cylinder 7a and the inner cylinder 8a. Further, since the heat-expandable gasket 6 expands and completely closes the gap between the outer cylinder 7a and the inner cylinder 8a, it is possible to completely seal without fastening with bolts.

[Brief description of the drawings]

FIG. 1 is an overall plan view of an exhaust manifold according to the present invention.

FIG. 2 is a side view showing a connection surface of a supercharger-side connection pipe 2 shown in FIG. 1;

FIG. 3 is a drawing showing a connected state of unit exhaust manifolds 5 having a divided configuration.

FIG. 4 is a drawing showing a state in which a divided unit exhaust manifold 5 is disassembled and a heat-expandable gasket 6 is taken out.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Supercharger side connection pipe 4 Joint bolt 5 Unit exhaust manifold 7 Central exhaust manifold 8 End exhaust manifold

Claims (3)

(57) [Claims] An exhaust manifold of a multi-cylinder engine is
Divided into two unit exhaust manifolds 5 and the two units
The division surface of the exhaust manifold 5 is connected to the entire exhaust manifold.
And the left and right unit exhaust manifolds 5
At the center, it is configured to be connected to the supercharger side connection pipe 2,
The supercharger side connecting pipe 2 connects the unit exhaust manifold 5.
At the inlet 2L and 2R, and the left and right exhaust
Until the gas passes through the inside of the supercharger side connection pipe 2 and enters the supercharger.
An exhaust manifold characterized by merging between . 2. The exhaust manifold according to claim 1, wherein
And the two unit exhaust manifolds 5 on the left and right are exactly the same
And left and right unit exhaust manifold 5 divided into two
The exhaust manifold is characterized in that it can be shared by rotating by 180 ° . 3. An exhaust manifold for a multi-cylinder engine,
Central exhaust manifold, which is a connection to the supercharger side connection pipe 2
7 and ends connected to the left and right of the central exhaust manifold 7.
The exhaust manifold 8.8 is divided into three parts,
The end exhaust manifold 8 is rotated by 180 °.
The central exhaust manifold
The hold 7 includes a connection bracket 7 for connecting to the supercharger side connection pipe 2.
c inside the connecting bracket 7c.
Left and right partition walls to prevent exhaust interference
The outer cylinder 7a on the side of the central exhaust manifold 7 and the end exhaust
The inner cylinder 8a on the air manifold 8 side is
The outer cylinder 7a and the inner cylinder
This <br/> an exhaust manifold, characterized in that a tubular thermal expansion gasket 6 fitted between 8a.