JPS6139069Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalytic converter for purifying exhaust gas from an engine.

More specifically, the present invention consists of two split sheet metal cases that are joined together at their joining flanges to form an inner case, and a two-part sheet metal split case that is arranged to surround this inner case. This invention relates to a catalytic converter in which an outer case is formed by integrally joining the flange portion thereof.

In this type of catalytic converter, a prior art technique aimed at reducing vibrations and heat transmitted from the inner case to the outer case is disclosed in Japanese Utility Model Application Publication No. 56-159608. FIG. 5 of this publication shows that cushion material clamping parts are bent at the parts connected to the joint flanges of the divided cases constituting the outer case, while a cross-sectional view is shown over the entire circumference of the flange part of the inner case. When a U-shaped cushion material is fitted onto the mantle and the divided cases are joined together at their joining flanges, the cushion material is clamped by the cushion material clamping portion, and the cushion material is inserted into the inner case through the cushion material. A catalytic converter is disclosed in which the catalytic converter is configured by holding the catalytic converter under pressure in an outer case. However, according to this prior art, since the cushion material is formed in a long dimension, it is difficult to control the thickness over the entire length. However, when the inner case is clamped to the outer case, it tends to rattle, which becomes a source of noise. Further, the work of fitting the long cushion material into the inner case and holding it in the cushion material clamping portion of the outer case is complicated, and there is also the disadvantage that the work efficiency is reduced.

The present invention aims to provide a catalytic converter which incorporates the advantages of the above-mentioned prior art, corrects its disadvantages, and is also excellent in economical efficiency.

The present invention will be explained in detail below based on embodiments shown in the drawings.

1 is an inner case, and one end has an exhaust gas inflow pipe 2
is provided with an exhaust gas outflow pipe 3 at the other end, and
A catalyst case 4 is provided inside. Catalyst case 4
is formed by welding a pair of upper and lower divided cases 4a and 4b made of perforated sheet metal plates at their joining flanges 4c and 4d, and a granular catalyst 5 is filled inside the case. The inner case 1 is a pair of upper and lower sheet metal divided cases 1 that are formed in a substantially symmetrical shape.
a, 1b are integrated by welding their joint flange portions 1c, 1d. In this embodiment, the joint flange parts 4c and 4d of the catalyst case 4 are interposed between the upper and lower joint flange parts 1c and 1d of the inner case 1, except for the front end and the rear end, and these are welded. They are integrated into one piece (Fig. 3). An upper chamber 6 communicating with the inflow pipe 2 and a lower chamber 7 communicating with the outflow pipe 3 are formed between the inner case 1 and the catalyst case 4, and the exhaust gas flowing into the upper chamber 6 from the inflow pipe 2 is , catalyst case 4
After passing through the lower chamber 7, the liquid is configured to flow out from the outflow pipe 3.

An outer case 8 is disposed around the outer periphery of the inner case 1 so as to surround it. The outer case 8 is formed by welding a pair of vertically substantially symmetrical split cases 8a and 8b made of sheet metal into one body at their joining flanges 8c and 8d (FIG. 3). A space is formed between the outer case 8 and the inner case 1, and this space is filled with a heat insulating material 9 such as glass wool or asbestos in order to enhance heat insulation and sound insulation effects.

In addition, upper and lower divided cases 8 constitute the outer case 8.
Cushion material clamping pressure portions 10a and 10b are formed by bending the portions a and 8b connected to the joint flange portions 8c and 8d, respectively, into a bulging shape.

At four points located at both ends of the two diagonal lines P and Q of the inner case 1, there are cushion members 1 having a U-shaped cross section.
1, 11, 11, 11 are fitted onto the joint flange parts 1c, 1d of the inner case 1, and the divided cases 8a, 8b constituting the outer case 8 are joined and integrated at the joint flange parts 8c, 8d. Therefore, the four cushion materials 11, 11, 11,
11 is clamped by the cushion material clamping parts 10a, 10b, and these cushion materials 11, 11, 11,
The inner case 1 is clamped and held by the outer case 8 via the inner case 11. As the cushion material 11,
Although it is preferable to use one formed by knitting metal fibers, the present invention is not limited thereto. Further, the width of the groove portion 12 of the cushion material 11 is as shown in FIG.
The thickness is set approximately equal to the total thickness of the joint flange parts 1c, 1d of the inner case 1 and the joint flange parts 4c, 4d of the catalyst case 4.

Thus, according to the above configuration, after inserting the cushion materials 11, 11, 11, 11 into the four points of the joint flange portions 1c and 1d of the inner case 1 and covering them with the heat insulating material 9, the outer case 8 is attached to these four points. Cover the upper and lower divided cases 8a and 8b, and remove both divided cases 8.
A force is applied to compress the cushioning materials 11, 11... and the heat insulating material 9 to a, 8d, and in a state where the joining flange parts 8c, 8d of the divided cases 8a, 8b are brought together, the joining is performed by welding. By joining and integrating the flange portions 8c and 8d, the catalytic converter of the above embodiment can be completed.
In the catalytic converter obtained as described above, the inner case 1 and the outer case 8 do not come into direct contact with each other, but only through the four cushion materials 11, 11, . . . The vibrations and heat transferred from the to the outer case 8 are significantly reduced as in the prior art.

In the above embodiment, the inner case 1 and the catalyst case 4 are connected and fixed by a center pin 13 passing through the center of each. Also, the outer case 8 and the inner case 1 are connected by connecting pins 14, 14......
This reinforces the integration of the two.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, as the main step for integrating the joint flange parts 1c, 1d of the inner case 1 and the joint flange parts 8c, 8d of the outer case 8, other than welding, riveting, screwing, etc. can be adopted. Further, in the above embodiment, the cushion material clamping portions 10a, 10b are bent over all of the portions connected to the joint flange portions 8c, 8d of the divided cases 8a, 8b of the outer case 8, but These cushion material clamping parts 10a, 10b
The four cushion materials 11, 11, 11, 1
They may be formed only at the four points where it is necessary to clamp 1.

As exemplified in the above-mentioned embodiment, the present invention integrates two divided sheet metal cases 1a and 1b at their joining flanges 1c and 1d to form a case 1, and a structure that surrounds the inner case 1. Split sheet metal case 8 placed in two parts
In a catalytic converter in which outer case 8 is formed by integrally joining a and 8b at their joining flange parts 8c and 8d, the joining flange parts 8c and 8b of split cases 8a and 8b forming outer case 8, respectively,
Cushion material clamping part 10 is connected to part 8d.
2 of the inner case 1 while bending the parts a and 10b.
Four cushion materials 11, 11, 1 with a U-shaped cross section arranged at four points located at both ends of the two diagonal lines P and Q.
1 and 11, the cushion material clamping part 10
Joint flange part 8 of inner case 1 between a and 10b
c and 8d are characterized in that the clamping pressure is maintained.

Since the present invention has the above-mentioned configuration, it is possible to reduce the vibration and heat transmitted from the inner case to the outer case, as well as the following unique effects, as in the prior art.

In the prior art, since the cushion material is formed in a long length, it is difficult to control the thickness over the entire length, and there is a drawback that rattling easily occurs between the inner case and the outer case, which becomes a source of noise. However, according to the present invention, the cushion material is arranged only at four points located at both ends of the two diagonals of the inner case, so it is easy to improve the machining accuracy of the cushion, and the material between the inner case and the outer case is It is possible to minimize rattling,
The generation of the noise can be significantly reduced.

Furthermore, the four cushion members of the present invention are arranged at four points located at both ends of the two diagonal lines of the inner case, which is advantageous in absorbing vibrations in all directions.

According to the present invention, the outer case can be attached after inserting the four cushion members into the joint flanges of the inner case, but the above-mentioned work in the prior art requires that the entire joint flange of the inner case be attached. Compared to the work of inserting the cushion material over the
It can be done easily and quickly, improving work efficiency.

According to the present invention, the amount of cushion material used can be significantly reduced, so it is economically efficient.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional front view thereof, FIG. 2 is a partially cutaway plan view thereof, and FIG. 3 is an end view rotated by 90 degrees from the - line end surface of FIG. 2. It is. 1...Inner case, 1a, 1b...Divided case,
1c, 1d...Joining flange portion, 8...Outer case, 8a, 8b...Divided case, 8c, 8d...
Joint flange portion, 10a, 10b...Cushion material clamping portion, 11...Cushion material, P, Q...Diagonal line.

Claims (1)

[Scope of utility model registration request] Two separate sheet metal cases are joined together at their joint flanges to form an inner case, and two parts are arranged to surround this inner case.
In a catalytic converter in which the outer case is formed by joining two separate sheet metal case parts together at their joint flanges, cushion material clamps are installed at the parts connecting to the respective joint flanges of the divided case parts constituting the outer case. While bending the pressure part,
The joining flange portion of the inner case is held under clamping pressure between the cushioning material clamping portions through four cushion members having a U-shaped cross section arranged at four points located at both ends of two diagonal lines of the inner case. A catalytic converter characterized by: