JPS60135614A - Catalytic converter - Google Patents

Abstract

PURPOSE:To bring the clamp load toward a catalyst carrier to a propriate value by a method wherein the case main body of the catalyst carrier and a keep plate are interlockingly seamed by folding each other. CONSTITUTION:A keep plate 5 is pushed in a case main body 1 by its bending- over allowance 51 by curling the opening end part 11 of the case main body 1 so as to push open said part 11 by means of a die D1. The amount of pushing-in is set in advance by a dimension of pushing-in depth or an indentation load and the compression allowance 31 of a holding member 3 is pushed in through a sealing material 4 between the case main body 1 and a carrier 2 at the finish of pushing-in, resulting in ensuring the exact quanities of holding of the carrier 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalytic converter for internal combustion engines, and particularly to a monolithic catalytic converter using a honeycomb catalyst carrier.

This kind of catalytic converter is made of stainless steel,
A case in which the peripheral surface of the catalyst carrier, except for the axial end surface, is wrapped with a holding member molded with foam or a foamed mat (for example, ceramic wool called Intalum Mat manufactured by 3M Company in the United States) and divided into two in the radial direction. together with the end sealing material, and the abutting surfaces of the split cases are welded to integrally connect them (Japanese Patent Application Laid-open No. 57-212319, No. 5 [1]).
(Refer to Publication No.-2412).

On the other hand, the honeycomb catalyst carrier is 5tO2・An, 03・Mg
It is a monolithic fired product whose main component is O, and it lacks impact resistance, is brittle and easily damaged, and has very rough finished dimensional accuracy. Chopeng Qiang, short axis 65I x long axis 130mm
In the elliptical phase body, the variation in the short and long axes is 4-strong each.

Therefore, when loading a conventional split-type case with a constant tightening margin on the mating surfaces, the tightening load becomes excessive for large-sized carriers and causes damage to the carrier, and for small-sized carriers, the tightening load If the catalytic converter is insufficient, it will be loosely held and loaded, and there is a risk of damage due to vibration.Therefore, there is a drawback that the function of the catalytic converter cannot be fully utilized.

In view of the above-mentioned problems, the present invention constructs a catalytic converter using the technology described in the claims, which is completely different from the above-mentioned conventional means.

The embodiments illustrated in the drawings will be described in detail below.

FIG. 1 shows a longitudinal sectional view of the upper half of the finished product of the present invention, and the lower half has exactly the same shape. l is the cylindrical case body, 2
3 is a catalyst carrier, 3 is a holding member also called a cushioning material,
4 is a sealing material formed by hardening and molding a heat-resistant material such as asbestos or steel wool, 5 is a holding plate, and 6 is a joint formed by collinearly wrapping the opening end of the case body 1 and the holding plate 5. .

This figure shows an exhaust gas purifier in which the holding plate 5 is a circular end plate, and exhaust pipes 7 and 8 are inserted and connected to the central hole thereof. However, the configurations 1 to 6 above are used as a converter unit, and the unit is used for a variety of purposes, such as incorporating it into an expansion chamber (muffling chamber) 10 of a muffler 9 as shown in FIG.

The order of configuring the above converter is shown in Figure 3 (A) to (
D) is exemplified.

1. Flare the open ends 11 at both ends of the cylindrical case body 1 to widen them.

2. Wrap the holding member 3 around the circumferential surface of the catalyst carrier 2 and insert it into the case body l.

In this example, as the compression allowance for the holding member 3, the end portion 31
are made to protrude from the end surface of the carrier 2.

3. Insert the ring-shaped sealing material 4.

4. At the opening end of the case body l, attach a presser plate 5 having at least an L-shaped surface in cross section and forming a seaming allowance 51 around it,
Fit until the tightening bar surface touches the opening end 11 (
Figure 3 (A)).

5. Using the press die DI, the presser plate 5 is wound with a tightening margin 51.
Push the open end 11 of the case body 1 into the case body 1 while spreading it and curling it.

The amount of pushing is set in advance by the pushing depth dimension or pressing load, and when the pushing is completed, the compression allowance 31 of the holding member 3 is applied to the case body 1 through the sealing material 4. ! 11 and the carrier 2 to ensure that the carrier 2 is held in just the right amount (
Figure 3 (B)).

6. Next, the press die Di is moved forward slightly and the first step of tightening is performed in cooperation with the press die D2 for tightening, the press die D3.
The second seaming step is performed as shown in FIGS. 3(C) and 3(D).

Note that the stamping dies D1 to D3 are examples for explaining the process. Further, due to the above-mentioned tightening, the case body 1 may be made of a metal plate material thinner than the presser plate 5. The cross section of the product may be circular, elliptical or other suitable shape.

FIG. 4 shows an example in which a ring-shaped compression section 41 is provided in place of the compression section 31 shown in FIG. 3 (^) by pressing into the sealing material 4.

FIG. 5 shows an example in which the sealing material 4 is provided with a ring-shaped guide 42 for correctly guiding the holding member 3 to the circumferential surface of the carrier 2.

Figure 6 shows a shape-retaining ring 15 between the sealing material 4 and the holding plate 5.
A ring 16 having a channel-shaped cross section is applied to the opposite surface of the sealing material 4, and its inner circumferential surface fits into the outer circumferential surface of the carrier 2 and is pushed between it and the case body l to hold the holding member 3. Example of compression.

FIG. 7 shows an example 17 in which the ring 16 has an L-shaped cross section.

In the converter unit shown in Fig. 2, the presser plate 4
It is also possible to form the sealing material protection ring 43 on the inside, and the various modifications described above are also included within the spirit of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the catalytic converter of the present invention, Fig. 2 is an explanatory diagram of the converter unit assembled into a muffler, and Figs. 3 (A) to (D) are explanatory diagrams of the assembly order. , FIGS. 4 to 7 are partially cutaway front views of modified examples. 1 is a case body, 1a is a mouth widening part, 2 is a catalyst carrier, 3 is a holding member, 4 is a sealing material, 5 is a presser plate, and 6 is a tightening and caulking part. Figure 3 (A) (B) Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] (A catalyst carrier with a holding member wrapped around the outer circumference except for both end faces in the axial direction is housed in a cylindrical carrier body, and the holding member is pushed in while pressing the sealing material on the end face in the axial direction with a pressing plate, A catalytic converter characterized in that the case body and the holding plate are jointly tightened together in a state in which the catalyst carrier is held against the case body by the pushing amount.