JPS635767Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an integral type having a non-circular ring body comprising a circular arc portion and a straight portion, and capable of firmly and reliably supporting the end of a cylindrical integral catalyst. This invention relates to a cushion for supporting the end of a catalyst.

In recent years, monolithic catalysts using a monolithic carrier made of ceramic, called so-called honeycomb type, monolith type, etc., have been frequently used as catalysts for exhaust gas purification and heat storage catalysts for preventing afterburn.
However, this integrated catalyst has poor impact resistance, so
It is necessary to use a cushion for installation in the container. On the other hand, for example, in order to burn and oxidize unburned gas at a low temperature to prevent afterburn, catalysts, etc. used as a heat storage part in the exhaust port of the engine or in the exhaust manifold near the exhaust port have an outer diameter of about 40 mm. In addition, although the thickness is relatively small at about 10 mm, the catalyst and the cushion, especially the cushion, are compression-molded bodies of thin metal wires, so the fit tolerance cannot be made small, and therefore a circular shape cannot be achieved. When a circular cushion is used to protect a shaped catalyst, the fit may be loose within tolerances, resulting in the catalyst falling off and cracking when the catalyst and cushion are attached. When the reference dimensions of the cushion are set to a small value, the tightening margin becomes too large and some cushions cannot be inserted, and the application of adhesive and the use of two types of cushions result in an increase in cost.

The object of the present invention is to provide a cushion for supporting the end of an integrated catalyst that can solve these problems, and one embodiment thereof will be described below with reference to the drawings.

Figures 1 and 2 show an embodiment in which a cushion 1 for supporting the end of an integral catalyst (hereinafter referred to as the cushion) of the present invention is employed to hold an integral catalyst 2 for afterburn prevention. In this embodiment, 2 is a disk-shaped outer circumferential surface in which a catalyst component is supported on a monolithic carrier with square through-holes 3 arranged side by side.A cushion 1 is formed on a ring body 4 and one end edge of the ring body. It is formed into an L-shaped cross section with an inner flange 5 that protrudes, and is provided with a stepped hole consisting of an inner hole 6 into which the end of the integrated catalyst 2 is inserted and a through hole 7 of the inner flange 5. Ru. The cushion 1 is made of thin heat-resistant metal wires such as stainless steel knitted, rolled up and compression-molded using a mold, and the ring body 4, together with the inner flange 5, is made of a circular ring divided into four equal parts. In this embodiment, a relatively short straight line portion 10 is interposed between the four-part circular arc portions 9 to smoothly connect them, and the four-part circular arc portions 9 are formed into a non-circular shape having a substantially quadrangular shape with circular arcs at the corner portions. be done. In addition, the circumferential length of the inner hole 6 is set to be the same as the circumference of the inner hole, which is set in consideration of the interference between the cushion 1 and the catalyst 2 when the cushion 1 is formed in a circular shape. Therefore, even at the lower limit of the manufacturing tolerance, the minimum diameter length D1, which is the distance between the straight portions 10, 10 of the ring body 4, is smaller than the minimum allowable tolerance dimension of the catalyst 2, compared to the case of a circular cushion. It can be set sufficiently small. In addition, there is a nusumi 12 at the corner of the ring body 4 and the inner tsuba 5.
is recessed to ensure contact between the catalyst 2 and the inner flange 5.

However, the cushion 1 of the present invention can be combined with an integrated catalyst 2.
The guide 1 is inserted into the inner hole 6 by hand until both ends of the guide 1 come into contact with the inner surface of the inner collar 5 of the cushion 1, and as shown in FIG.
4. Using the press jig 15, insert the outer cushion 1 into the tip hole of the exhaust manifold 16 in a protruding state, and then insert the cushion 1 so that the protruding part of the cushion 1 is flush with the end surface of the exhaust manifold 16. It is attached to the exhaust port 19 of the engine via a gasket by applying a narrow pressure to the engine (as shown in FIG. 3b). At this time, the cushion 1 has an annular body 4 formed in a non-circular shape and can be elastically deformed from the minimum diameter length D1 until it is deformed into a circular shape by insertion of the catalyst 2. Compared to the case where the cushion 1 is produced in a circular shape, the range in which the cushion 1 can be elastically deformed can be increased, and by increasing the interference between the cushion 1 and the end of the catalyst 2, the Prevent falling off.
Note that, after the cushion 1 is deformed into a perfect circle, it has the same tightening margin as the cushion that has been previously formed into a perfect circle, and is securely clamped.

As mentioned above, in the cushion of the present invention, the linear portion functions as a tightness margin and increases the amount of elastic deformation of the cushion, thereby making it possible to insert the integrated catalyst while reliably pressing and clamping it. It is possible to prevent falling off and cracking due to oxidation, and improve the efficiency of installation work. The cushion of the present invention can be suitably used in places where relatively small catalysts are used, such as heat storage parts for afterburn prevention, and can also be used as a cushion to support the ends of large integrated catalysts for so-called exhaust gas purification. .

[Brief explanation of the drawing]

Figure 1a is an enlarged plan view showing one embodiment of the present invention, Figure 1b is a sectional view thereof, Figure 2 is a perspective view illustrating the catalyst used in the present invention, and Figures 3a and b are its use. FIG. 3 is a cross-sectional view illustrating the method. 4... Ring body, 5... Inner tsuba, 9... Arc part, 1
0... Straight line part.

Claims (1)

[Scope of utility model registration request] A non-circular ring with a straight line interposed between the quarter-arc parts, with an inner flange on one end edge, and formed by compression molding a heat-resistant thin metal wire.
Cushion for end support of integrated catalyst.