JPS59138715A - Assembling method of catalyst converter - Google Patents

Abstract

PURPOSE:To improve the sealing performance and prevent a resilient holding member from a damage by in advance compressing the resilient holding member on the external periphery of a cylindrical monolyth type catalyst carrier in the direction of the thickness thereof and making butting conjuction of two parts of a bisected casing as to put the catalyst carrier therebetween. CONSTITUTION:A sheet-like resilient holding member 2 is wound around the external periphery of an elliptic-shell-shaped monolyth-type catalyst carrier 1 which is made of ceramic or so and the free ends of the member to be butted against each other are fastened to each other with a tape and four parts 51 to 54 into which a press mold is sected are then compress the resilient holding member 2 up to the specified thickness in the directions of respective four thicknesses. The catalyst carrier 1 is taken out along with the resilient holding member 2 from the four press mold parts 51 to 54 and the halves 3a and 3b of a splittable casing 3 are put closely together in the vertically opposed directions as to sandwich the catalyst carrier 1 to make the flange parts 4a and 4b of the halves butt against each other. The resulting abutment is unitedly joined by welding or other method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a monolithic catalytic converter connected to an exhaust system or the like of a vehicle internal combustion engine.

The catalytic converter is a device that comes into contact with the exhaust gas from the internal combustion engine and saponifies or reduces harmful components such as Co, HC, and NOx contained in the exhaust gas to render them harmless, and has recently been used in internal combustion engines for vehicles. However, the catalyst carrier of the catalytic converter is made of a single piece of ceramic and is relatively fragile.
It is necessary to house and hold the catalyst carrier in a casing so that external forces and vibrations are not transmitted to the catalyst carrier as much as possible.

The monolithic catalytic converter C has a structure as shown in FIG. 1.2. Namely cerami.

A single elliptical cylindrical catalyst carrier 1 made of wood or the like; ceramic fibers wrapped around the outer periphery of the catalyst carrier 1;
A plate-shaped elastic holding member 2 made of asbestos, glass wool, wire mesh, and ceramic fibers containing vermiculite that has a sealing function as well as a holding function, and covering the elastic holding member 2.
The casing 3 is composed of a two-part casing 3, both ends of which are tapered, and both open ends thereof are connected to the exhaust system of the internal combustion engine.

By the way, in the monolithic catalytic converter C configured as described above, in order to ensure the elastic holding force of the catalyst carrier 1, the elastic holding member 2 is thicker than the gap between the catalyst carrier 1 and the casing 3. Since it is interposed between them in a compressed state, there is a problem in its assemblability. That is, the conventional catalytic converter C' employs the assembly method shown in FIGS. 3 to 5, and as shown in FIG. Arrived,
After fixing the abutting free ends of the member 2' with tape or the like,
As shown in FIG. 4, the casing halves 3/a and 3/A are brought together from above and below so as to sandwich the catalyst carrier 1', and as shown in FIG.

4/l, against each other, and their flange parts 4
/a, 417. The comrades were welded together. By the way, when the casing halves 3'a and 3'h are brought together from above and below, the thickness of the elastic holding member 2' is larger than the gap between the catalyst carrier 1' and the casing halves 3', as described above. So, the casing is half-bathed 3'a.

3/ If a part of the elastic holding member 2' gets caught between the flange parts 4'α and 4'b of J, a gap a will be created between the mating surfaces of the flange parts 4'α and 4'h, or if the elastic holding member 2' If the joints of the members 2' separate and a gap is formed there, the elastic holding force of the catalyst carrier 1' by the two-part casing 3' may be reduced, and the sealing performance of the elastic holding member 2' may be deteriorated. In some cases, problems such as damage or damage to the elastic holding member 2I may occur.

Therefore, the main object of the present invention is to provide a method for assembling a catalytic converter that eliminates the drawbacks of the conventional assembling methods. After being compressed, the casing halves of the two-split casing are placed on the outer periphery of the casing and brought together so as to sandwich the catalyst carrier, so that they are joined together.

Further, using the catalyst carrier as a core body, the elastic holding member is compressed in advance using this core body and a press mold, and then the casing halves of the two-part casing are placed on the outer periphery of the elastic holding member, and the casing halves of the two-part casing are brought together so as to sandwich the catalyst carrier between them. I try to join them together.

Examples of the method of the present invention will be described below with reference to FIGS. 6 to 10.

As shown in FIG. 6, a plate-shaped elastic holding member 2 is attached to the outer periphery of an elliptical cylindrical catalyst carrier 1 made of ceramic or the like in the same manner as in the conventional method, and then the free ends are brought into contact with each other. Secure with tape, etc. Next, as shown in FIGS. 7 and 8, the catalyst carrier 1 to which the elastic holding member 2 is attached is
is placed vertically on a press mold base B, and on the base B, a press mold 5 divided into four parts is placed on the outer periphery of the catalyst carrier 1. 54 are arranged radially such that they can move forward and backward with respect to the catalyst carrier 1. The inner surface 6 of the press mold 5, - 54 facing the catalyst carrier 1. -64 are formed in the same arcuate surface as the outer surface of the catalyst carrier 1. Press mold 5. Inclined cam surfaces T, ~T are formed on the outer surfaces of ~54, respectively.

Press mold 5I-5. A driver 9 is suspended from the upper holder 8, and the inner surface of the driver 9 has the inclined cam surface 1. Another inclined cam surface 101 corresponding to 14 is formed. When the holder 8 is lowered, the inclined cam surface 10 of the driver 9. is the inclined cam surface T, ~1 of the press molds 5I~54
4, and further lowers the holder 8 to press mold 5. 54 are moved toward the catalyst carrier 1, and the elastic holding member 2 can be compressed to a predetermined thickness in the thickness direction by the catalyst carrier 1 and the press molds 51 to 5i. In this case, by dividing the press molds 5□ to 54 into a plurality of pieces, the surface pressure on the catalyst carrier 1 can be equalized.

Next, press mold 5. After taking out the catalyst carrier 1 together with the elastic holding member 2 from ~54, it is returned to its original position as shown in FIG.
After positioning the casing 3 in half from above and below so as to sandwich the catalyst carrier 1, the casing halves 3α, 3h of the casing 3 are
are brought together, and their seven flange portions 4α, 4h are brought into contact with each other, and they are joined together by welding or the like. In this case, since the elastic holding member 2 has been compressed to a predetermined thickness in the thickness direction in a previous step, the flange portion 4a,
During the 4h period, a part of the elastic holding member 2 may get caught and a gap may be created between the flange parts 4α and 4b, or the elastic holding member 2 may become stuck.
There is no need to worry about the abutting end surfaces being pulled apart.

Furthermore, since the catalyst carrier 1 is made of ceramic or the like, it has large tolerances, which causes dimensional variations in the product. As a result, the degree of compression of the elastic holding member 2 is adjusted in response to the above-mentioned dimensional variations, thereby making it possible to perform compression that matches the dimensions of the catalyst carrier, and also minimizing the amount of compression of the elastic holding member 2. It can be stopped.

As described above, according to the method of the present invention, after compressing the elastic holding member attached to the outer periphery of the catalyst carrier in the thickness direction, the casing is divided into two parts so as to sandwich the catalyst carrier. Since the casing halves are brought together and joined together, there are no disadvantages such as the elastic holding member getting stuck between the two halves of the casing or the abutting end surfaces of the elastic holding members separating from each other as in the conventional method. It is possible to increase the holding power of the catalyst carrier and improve the sealing performance of the elastic holding member, and there is no risk of damage to the elastic holding member.

Further, according to the second invention, since the elastic holding member is compressed in advance using the core body as a catalyst carrier and the press die, the degree of compression of the elastic holding member due to variations in the external dimensions of the catalyst carrier can be avoided. Even if the tolerance of the catalyst carrier is large, the elastic holding member can be compressed to match the tolerance.Furthermore, after the elastic holding member is compressed, the catalyst carrier is divided into two parts via the elastic holding member. Since the working time required to cover the casing can be shortened, compression of the elastic holding member can also be kept to a minimum.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of the catalytic converter, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figures 3 to 5 show the conventional method of assembling a catalytic converter, and Figure 3 is a catalytic converter. FIG. 4 is a diagram showing the state in which the elastic holding member is attached to the converter, FIG. 4 is a diagram showing the state in the middle of assembling the split casing to the catalyst carrier, FIG. 5 is a diagram showing the state in which the covering is completed, and FIGS. Figure 10 shows the method of assembling the catalytic converter of the present invention.
The figure shows the state in which the elastic holding member is attached to the catalyst converter, Fig. 7 is a plan view showing the state of the elastic holding member just before being compressed by the press mold, Fig. 8 is a longitudinal sectional view thereof, and Fig. 9 is FIG. 10 is a vertical cross-sectional view showing the state of the elastic holding member after compression, and FIG. 10 is a vertical cross-sectional front view of the catalytic converter after assembly. 1... Catalyst carrier, 2... Elastic holding member, 3... 2
Casing divided into two, 3α, 3b...casing half,
Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] (1) A cylindrical monolithic catalyst carrier, a plate-shaped elastic holding member attached to the outer periphery of the catalyst carrier, and a two-part casing covering the outer periphery of the elastic holding member. In the method for assembling a catalytic converter, the elastic holding member is compressed in advance in its thickness direction, and then the two halves of the casing are brought together so as to sandwich the catalyst carrier therebetween. A method for assembling a catalytic converter, which is characterized by joining in a closed position. ■ A cylindrical monolithic catalyst carrier and a □ of the catalyst carrier.
It consists of a plate-shaped elastic holding member that is tied to the outer periphery, and a two-part casing that covers the outer periphery of the elastic holding member.
In the method for assembling a catalytic converter, the elastic retaining member is compressed in advance using the catalyst carrier as a core body and a press mold, and then the casing halves of the two-part casing are assembled with each other with the catalyst carrier sandwiched therebetween. A method for assembling a catalytic converter, characterized by bringing them together and joining them together.