JP3728582B2 - Catalyst case - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a catalyst case.
[0002]
[Prior art and problems]
Conventionally, as shown in FIG. 5 , a catalyst 5 is housed in a catalyst case 2 fixed on the downstream side of the exhaust manifold 1 so as to be surrounded by a holding material 6. That is, the catalyst 5 is formed in a ceramic honeycomb shape, has low strength, and may be damaged due to vibration of the engine or the like, or thermal expansion difference from the catalyst case 2, etc., so a metal wire mesh or glass fiber In order to hold the catalyst 5 fixed, the downstream end of the catalyst 5 is used for preventing catalyst misalignment. The cap 52 is provided, and a fixing bolt 51 is inserted into the catalyst 5 from the outside of the catalyst case 2. Conventionally, the catalyst 5, the holding material 6 and the cap 52 are placed in the catalyst case 2. In order to fix firmly, it has assembled by managing the insertion cost of the catalyst 5. However, the management width at the time of insertion is low because the strength of the catalyst 5 is low. If the insertion allowance is large, the catalyst 5 is easily damaged. If the insertion allowance is small, the catalyst 5 is not firmly fixed. Since the cap 52 moves during the operation of the engine and damages the catalyst 5, there is a problem that it is necessary to insert it with high accuracy and the assembly work is difficult, and the number of parts increases. There was a problem that it became expensive.
[0003]
[Means for Solving the Problems]
The present invention has been devised in view of the above-mentioned conventional problems, and aims to provide a catalyst case that has a small number of parts and that can be easily assembled. The gist of the present invention is a catalyst encased in a holding material. In the catalyst case, the holding material has a protruding portion that protrudes downstream from the downstream end of the catalyst, and is fixed to the outlet downstream side of the catalyst case when the catalyst moves downstream. The downstream end of the catalyst is configured to be in contact with and held through the protruding portion by a funnel-like portion formed in a protruding portion that protrudes from the outlet into the enlarged diameter portion of the catalyst case outlet .
[0004]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional configuration diagram of a catalyst case containing a catalyst, and FIG. 2 is an enlarged cross-sectional configuration diagram of a main part.
[0005]
In the cylindrical catalyst case 2, the catalyst 5 is housed in a state where the outer periphery is wrapped with the holding material 6, and the downstream end of the holding material 6 protrudes further downstream than the downstream end of the catalyst 5. The interior is formed with the protruding portion 6a formed.
[0006]
When it is difficult to form the fastening portion at the upper part of the catalyst case 2 due to restrictions on the shape of the vehicle, or when the exhaust manifold 1 and the catalyst case 2 are formed integrally, the dividing portion is provided below the catalyst case 2. However, in FIG. 1 , the outlet 3 formed separately is fixed on the downstream side of the catalyst case 2, and the downstream end of the catalyst case 2 has an enlarged diameter portion 2 a that is expanded outward. The end portion of the enlarged diameter portion 2a is joined to the flange portion 3a formed on the outlet 3 by friction welding. The inner diameter side of the enlarged diameter portion 2a is upstream from the outlet 3. A protruding portion 7 that protrudes integrally to the side is disposed, and this protruding portion 7 can prevent the intrusion of the molten burrs into the inside during friction welding. Tapered funnel portion 7a is also formed When the catalyst 5 moves to the downstream side during the operation of the engine or the like, the protruding portion 6a of the holding material 6 goes around the downstream end of the catalyst 5 by this funnel-shaped portion 7a, and the protruding portion 6a is downstream end outer periphery of the catalyst 5 in a state of being interposed in contact with the funnel-shaped portion 7a, is what is retained favorably, showing the state in FIG.
[0007]
As shown in FIG. 2 , the outer diameter D <b> 1 of the protruding portion 7 is formed larger than the inner diameter D <b> 0 of the catalyst case 2, and the protruding portion 6 a of the holding material 6 is on the outer peripheral side of the protruding portion 7. It is set so as not to enter. That is, the funnel-shaped portion 7a is formed to have a larger diameter than the outer diameter of the catalyst 5 in a state where the holding material 6 is wound around the outer periphery. It is comprised so that the downstream end outer periphery may be hold | maintained.
[0008]
4 shows an enlarged cross-sectional view of the main part, in which the flange portion 2b is integrally formed in a protruding manner on the outside of the enlarged diameter portion 2a of the catalyst case 2 with respect to the flange portion 3a of the outlet 3. 3a and the flange portion 2a are aligned and tightened with a bolt 8, and the outlet 3 is fixed to the catalyst case 2. In such a fastening structure with the bolt 8, the protruding portion is also integrally formed with the outlet 3. 7 is formed, and an inclined funnel-shaped portion 7a is formed inside the projecting portion 7 so that the catalyst 5 can be held well.
[0009]
【The invention's effect】
The present invention provides a catalyst case in which a catalyst wrapped in a holding material is housed, and the holding material has a protruding portion that protrudes downstream from the downstream end of the catalyst, and when the catalyst moves downstream, A downstream end of the catalyst abuts and is held through the protruding portion by a funnel-shaped portion that is formed in a protruding portion that protrudes into an enlarged diameter portion of the catalyst case outlet from an outlet fixed on the outlet downstream side of the catalyst case. The outlet can be fixed without damaging the catalyst on the downstream side of the catalyst, and the catalyst can be received and held well by the funnel-shaped part formed on the protruding part of the outlet. Will be able to. In addition, the catalyst can be easily inserted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional configuration diagram of a catalyst case.
Figure 2 is an enlarged cross-sectional view of FIG.
FIG. 3 is a cross-sectional configuration view of a main part corresponding to FIG. 2 in a state where a catalyst is held.
FIG. 4 is a cross-sectional configuration view of a main part of a catalyst case of a type in which an outlet is fixed by bolts.
FIG. 5 is a cross-sectional configuration diagram of a conventional catalyst case.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exhaust manifold 2 Catalyst case 2a Wide diameter part 2b Flange part 3 Outlet 3a Flange part 5 Catalyst 6 Holding material 6a Overhang | projection part 7 Protrusion part 7a Funnel-like part 8 Bolt

Claims (1)

In a catalyst case in which a catalyst wrapped in a holding material is housed, the holding material has a protruding portion that protrudes downstream from the downstream end of the catalyst, and when the catalyst moves downstream, the outlet of the catalyst case The downstream end of the catalyst is configured to be held in contact with the protruding portion by a funnel formed in a protruding portion that protrudes from the outlet fixed on the downstream side into the enlarged diameter portion of the catalyst case outlet. Catalyst case characterized by being made .

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