JPH11336532A - Exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the engine output by enlarging the inter-passage leaking resistance for the exhaust gas in the joining part of the end of a partitioning plate to separate the exhaust gas into a plurality of passages with the end of a catalyst carrier and prevent the catalyst carrier from a damage caused by a contact of the partitioning plate. SOLUTION: A catalyst carrier 1 for exhaust emission control is housed in a metal case 2, and a front cone 3 is connected by welding to the front extremity of the case 2 and a rear cone 4 is welded to the tail. A partitioning plate 5 is installed so that the exhaust gas flows upon being separated into a plurality of passages 6 and 7. A plurality of fit grooves 12 and 13 are formed at that end of the catalyst carrier 1 situated on the side with the partitioning plate 5. The end of the plate 5 is branched, and the produced branches 5a and 11a are loosely fitted in the grooves 12 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an exhaust gas purifying apparatus.

[0002]

2. Description of the Related Art Conventionally, in an exhaust manifold of an internal combustion engine, exhaust gas of an engine is divided into two flow paths to circulate, and interference between exhaust gases in each flow path is suppressed to improve engine output. In addition, there is a dual exhaust manifold in which the inside of a flow path is divided into two flow paths by a partition plate. When a catalyst carrier for purifying exhaust gas is installed in the flow path thus partitioned, the separated exhaust gas needs to flow through the catalyst carrier in a divided state.

[0003] For this reason, conventionally, the end of the above-mentioned partition plate is brought close to the end of the catalyst carrier (for example, Japanese Patent Laid-Open No. 9-22 / 1997).
No. 2014) and one in which the joining end of two exhaust pipes is fitted to the end of a catalyst carrier via steel wool (for example, FIG. 1 of Japanese Utility Model Laid-Open No. 2-147819).

[0004]

In the former prior art, a relatively wide gap is formed between the end face of the partition plate and the end face of the catalyst carrier, the leakage between the exhaust gas passages is large, and the engine output is reduced. There is a risk of hindering improvement.

[0005] In the latter conventional technique,
Since the steel wool moves in contact with the catalyst carrier due to engine vibrations and the like, the catalyst carrier is worn by the steel wool, and the sealing performance between the exhaust gas flow paths is impaired, which may hinder improvement in engine output. .

Accordingly, the present invention suppresses the leakage of exhaust gas between the end of the partition plate and the end of the catalyst carrier as described above, and also causes the catalyst carrier to be worn or damaged by the partition plate due to vibration of the engine or the like. An object of the present invention is to prevent exhaust gas from leaking for a long period of time, suppress exhaust gas interference between flow paths, and improve engine output.

[0007]

According to a first aspect of the present invention, there is provided an exhaust system having a partition plate provided to separate and circulate exhaust gas into a plurality of flow paths. In the gas purification device, a plurality of fitting grooves are formed at an end of the catalyst carrier for purifying exhaust gas on the side of the partition plate, and the ends of the partition plate are branched and each end is formed into the fitting groove. It is characterized by being loosely fitted.

In the present invention, since the end of the partition plate is loosely fitted in the fitting groove of the catalyst carrier, the partition plate does not come into contact with the catalyst carrier due to engine vibration or the like. Further, since a plurality of ends of the partition plate are loosely fitted in the plurality of fitting grooves to form a labyrinth, leakage resistance of exhaust gas between the exhaust gas passages is increased.

According to a second aspect of the present invention, in the first aspect, a chamber in which the gap is increased in a part of the gap formed in a meandering shape by loosely fitting the partition plate into the fitting groove. Is provided.

In the present invention, by increasing a part of the gap as described above, the leakage resistance of the exhaust gas between the flow paths can be further increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in FIGS. 1 and 2 show a first embodiment.

In FIG. 1, a catalyst carrier 1 is housed in a metal case 2, and a front cone 3 is provided at the front end of the case 2.
Are connected by welding, and a rear cone 4 is connected to the rear end by welding.

In the front cone 3, one partition plate 5 for dividing the inside of the front cone 3 into two parts in the radial direction through substantially the center thereof.
Are arranged, and two flow paths 6 and 7 are formed by the partition plate 5.

The inside of the rear cone 4 is also formed in the two flow paths 9 and 10 by the partition plate 8 like the front cone 3. On the catalyst carrier 1 side of the partition plate 5, a second partition plate 11 parallel to the partition plate 5 is branched and fixed. The front end of the catalyst carrier 1 is provided with a fitting groove 12 along the end 5a of the partition plate 5 and the end 11a of the second partition plate 11, that is, over the entire radial length of the catalyst carrier 1. , 13
Are formed. The ends 5a and 11a of the partition plates 5 and 11 are loosely fitted in the fitting grooves 12 and 13, respectively. The end 5a, the inner surface of the fitting groove 12 and the end 1
The gap between 1a and the inner surface of the fitting groove 13 is set to a size such that the end portions 5a, 11a do not contact the inner surfaces of the fitting grooves 12, 13 even by vibration of an engine or the like.

The fitting grooves 12, 13 of the catalyst carrier 1 are shown in FIG.
As shown in FIG. 2, a plugging member 14 having a Y-shaped cross section may be fixed to the catalyst carrier 1 and formed by outer pieces 14 a and 14 b and an intermediate piece 14 c.

Further, as shown in FIG. 1, the end of the partition plate 8 in the rear cone 4 and the rear end of the catalyst carrier 1 are loosely fitted in the same structure as described above. Therefore, similar parts are denoted by the same reference numerals as above, and description thereof is omitted.

The front partition plate 5 and the rear partition plate 8 are arranged in the same phase with respect to the catalyst carrier 1. An upstream exhaust pipe (not shown) from the internal combustion engine is connected to the upstream end of the front cone 3, and a downstream exhaust pipe (not shown) is connected to the downstream end of the rear cone 4. Further, the inside of each of the upstream exhaust pipe and the downstream exhaust pipe is separated by a partition plate.
Each of the tubes is constituted by a so-called .theta. Tube, and one of the tubes communicates with the one of the channels 6 and 9, and the other channel communicates with the other channels 7 and 10. ing.

In the above structure, the exhaust gas flowing into one flow path 6 of the front cone 3 passes through the catalyst carrier 1 as it is and flows out of one flow path 9 of the rear cone 4.
The exhaust gas flowing into the other flow path 7 of the front cone 3 passes through the catalyst carrier 1 as it is and flows out of the other flow path 10 of the rear cone 4.

At this time, since the labyrinth is formed by the end portions 5a and 11a of the two partition plates 5 and 11 in the front cone 3 and the fitting grooves 12 and 13 of the catalyst carrier 1 in which the end portions 5a and 11a fit, a labyrinth is formed. The leakage resistance (sealability) of the exhaust gas between the passages 6 and 7 is increased, and the interference of the exhaust gas between the passages can be suppressed. Therefore, the engine output can be improved in the dual exhaust manifold.

Further, since a gap is formed between the end portions 5a, 11a of the partition plate 5 and the inner surfaces of the fitting grooves 12, 13, the partition plates 5a, 11a come into contact with the catalyst carrier 1 due to vibration of the engine or the like. This prevents the catalyst carrier 1 from being damaged such as the catalyst carrier 1 being worn by the partition plate.

Further, the above-mentioned partition plate 5 and the second partition plate 11
Between them, a chamber 15 is formed in front of the intermediate piece 14c, and the chamber 15 defines an intermediate portion of a meandering gap formed by the partition plates 5, 11 and the catalyst carrier 1 (the plugging member 14). In addition, a space in which the gap becomes large is formed. This room 15
, The leakage resistance of the exhaust gas between the flow paths 6 and 7 is further increased.

The fitting portion between the partition plate 8 of the rear cone 4 and the catalyst carrier 1 also exhibits the same operation and effect as described above. FIG. 3 shows a second embodiment.

The second embodiment is different from the first embodiment in that a third partition plate 16 similar to the second partition plate 11 is provided.
Is fixedly provided on the side opposite to the second partition plate 11, and a fitting groove 17 for loosely fitting the end 16 a of the third partition plate 16 is formed at the end of the catalyst carrier 1. That is, the three partition plates 5, 11, 16 are connected to the three fitting grooves 12, 13, 17, respectively.
It is loosely fitted to. In the embodiment of FIG. 3, the plugging member 14 shown in FIG. 2 is not provided. 15,1
5a is the same chamber as in the above embodiment.

In the second embodiment as well, the wear and damage of the catalyst carrier 1 can be prevented and the first
Exhaust gas leakage resistance can be further increased as compared with the embodiment.

FIG. 4 shows a third embodiment. In the third embodiment, the partition plate 5 is formed by stacking two plates 5b and 5c, and the ends 5d and 5e of the plates 5b and 5c are bent to fit the catalyst carrier 1. These are loosely fitted in the grooves 12, 13.

In the third embodiment, the same functions and effects as in the first embodiment can be exhibited. The catalyst carrier 1
The number of the fitting grooves formed in the first embodiment and the end portions of the partition plate to be loosely fitted therein are not limited to the number of the above embodiments. In the above embodiment, the partition plates are provided on both the front cone 3 and the rear cone 4. However, if necessary, the partition plate 5 is provided only on the front cone 3, and the partition plate 8 is provided on the rear cone 4. It may not be.

[0027]

As described above, according to the present invention, since the partition plate does not come into contact with the catalyst carrier, the catalyst carrier is worn out.
Does not damage the catalyst support.

Further, the leakage resistance of the exhaust gas between the flow paths is increased, the interference of the exhaust gas between the flow paths is suppressed, and the engine output can be improved. According to the invention described in claim 2,
The leakage resistance of the exhaust gas can be further increased, the interference of the exhaust gas can be further suppressed, and the engine output can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a fitting portion between a partition plate and a fitting groove in FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Catalyst support 3 ... Front cone 4 ... Rear cone 5, 8 ... Partition plate 5a, 5d, 5e, 11a, 16a ... End part 6, 7, 9, 10 ... Flow path 12, 13, 17 ... Fitting groove 15, 15a… room

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Takayuki Akimoto 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (2)

[Claims] In an exhaust gas purifying apparatus provided with a partition plate for separating and flowing exhaust gas into a plurality of flow paths,
A plurality of fitting grooves are formed at the end of the catalyst carrier for purifying exhaust gas on the side of the partition plate, and the ends of the partition plate are branched and each end is loosely fitted to the fitting groove. Exhaust gas purifier characterized. 2. The exhaust gas purification system according to claim 1, wherein a chamber is formed in a part of the gap formed in a meandering shape by loosely fitting the partition plate into the fitting groove. apparatus.