JPS5859310A - Catalytic converter - Google Patents

Abstract

PURPOSE:To make a light weight catalytic converter and at the same time to reduce a cost by a method wherein a sheet metal and castings are used together as a material quality of a container for catalytic converter and they are integrally formed by internal chill process. CONSTITUTION:A part of a container 2 for catalytic converter corresponding to the seal members 3 and 5 and the wire mesh 4 as well as the cylindrical case 2c near the former are of a metal sheet and other parts i.e. the exhaust gas feeding part 2a having flange 6 and the exhaust gas discharging part 2b having a tapered part 7 and a flange 8 are made of cast iron. The upper end of the sheet metal cylindrical case 2c and the cast iron exhaust gas discharging part 2a are internal chilled, and the lower end of the case 2c and the cast iron exhaust gas discharging part 2b are similarly internal chilled.

Description

[Detailed Description of the Invention] The present invention relates to a catalytic converter that is used as a gas purification device in the exhaust system of automobiles, etc., and in particular, to the improvement of a container that constitutes the catalytic converter. It is mainly composed of a calibrator for purifying exhaust gas and a container for holding the catalyst. Of these, the 'S' part is made of a type 2 material, that is, a sheet metal such as stainless steel. Containers made of #11II were selected, and each of them was individually used as *U. //Make a predetermined shape using JIIc sheet metal, and then use a suitable joining method to join these components, such as by melting 1g! It is formed by −° body. In this case, the catalyst to be held in the volume a is 1
Part of the component is preloaded, usually in the outer shell, or injected into an integrated container. For such sheet metal containers, the cast metal t
It is lighter than 4D), and the sheet metal itself has excellent durability, with a rating of -40, but on the other hand, each component of the container is made as a shoulder body, and the bale is integrated. The next 10 volumes of stagnation! I have Maro.

In other words, the dimensional accuracy of the weight when assembling the winter sheet metal l1lIIIL part 1 by conductive connection etc. and the very high precision as the sheet metal *m* are required. Since the problem and the durability at the joints of component parts and the catalyst intervening parts are made of sheet metal, there are natural limits.In other words, welding distortion was also taken into consideration so as not to impair the assemblability of m-component parts. 1. Also, due to distortion due to high humidity and expansion during operation, the joints may be damaged and the durability of the joints may be reduced.
In other words, the reliability as a container also decreases.

In addition, the latter casting container company has all the constituent members of the container integrally cast.

In this case, the catalyst will be loaded into the container after casting. In such a cast container, the catalyst intervening part is usually machined by casting wall machining, so the dimensional precision of the catalyst intervening part and the interstitial layer of Michigami that occur in the above-mentioned sheet metal containers do not occur. , cut sheet metal container K) Since each component of the container is manufactured integrally, there is no need to worry about the dimensional accuracy at all. , problems caused by the characteristics of castings, such as high weight and inferior quality. In other words, due to the increased production volume of containers due to the need for extra wall thickness compared to those made of sheet metal, the exhaust system materials to which the containers should be attached, & e.g. exhaust manifolds. It became necessary to increase the mounting strength of the container, which increased the overall weight of the exhaust system, and there were concerns about the durability and reliability of the container due to the inherent inferiority of casting, such as the formation of nests and cocoons. It is. In particular, there were problems with high weight, which had an adverse effect on engine performance, resulting in a decrease in engine output and deterioration in fuel efficiency.

The object of the present invention is to solve the conventional catalytic converter OSS that uses a cast metal container instead of a sheet metal container. Both the gas introduction part and #gas discharge part are KIl.
The cylindrical nurse between the introduction part and the discharge part is made of sheet metal, and the introduction part and the corresponding section Ia, the discharge part and the case, and the like. %C characterized in that the ends are both integrated by casting, and 7.
It is.

In other words, the catalytic converter of the present invention does not use sheet metal or cast iron alone as the material of the container, but uses both in combination to solve the problem of interstitial layering by using a multilayer structure alone, and , and 7. By integrating the two by casting means, problems at the joint between the two can be eliminated.

In this case, the catalyst I# side phase which requires particularly high mK resistance and abrasion resistance S4i! J section,
That is, if the container is made of an ordinary sheet metal, and the part formed as the outer shell is made of sheet metal, particularly stainless steel, the above requirements can be satisfactorily met.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the first embodiment of the present invention. In the figure, 1 is a catalyst, 2 is a container to hold the catalyst 1, and 1 and 2 are both 1 and 2 as usual. An annular seal member 3 and a compressible wire mesh 4 are interposed in order from the upstream side of the exhaust gas (from the top in the figure). A seal member 5 is arranged.The seal member 3 is located at the exhaust gas introduction part 2a.
This is to prevent the leakage of the exhaust gas flowing in (K), and the wire mesh and the 4Fi catalyst 10 are used to hold the radial direction of the exhaust gas. This prevents the catalyst from moving to the lower dLilli due to flow and back pressure.

In this case, 1 volume #2 is approximately cylindrical, and the upstream lllIc
The exhaust gas inlet g 2 a K Fi is simply provided with an inlet mounting 7 flange 6 radially outwardly 1
On the other hand, a tapered part 7 whose opening area is gradually reduced toward the first upstream and downstream is formed in the exhaust gas discharge part on the downstream side, and at the tip of the tapered part 7 there is a protruding mounting mount 8 in the same way as above. ◎ In this example, of the round-shaped container 20, the sealing members 3, 5, the wire mesh part 4, and the cylindrical case 2C in the vicinity are made of sheet metal. Exhaust gas introduction w62 consisting of 7 lunges 6
The exhaust gas discharge part 2b, which is composed of the taper part 7 and the 7-lunge 8, is made of cast iron. Then, the upper end of the cylindrical case 2cO made of sheet metal and the cast exhaust gas introduction part 2a are integrated by a casting, and the door of the nurse 2C and the cast exhaust gas discharge part 2b are similarly integrated by a casting. ing.

In the catalytic converter constructed in this way,
Since the cylindrical case 2C is made of sheet metal, it has excellent high temperature strength and has very good durability when mounted on a vehicle.
Since the exhaust gas introduction part 2a and the exhaust gas discharge part 2b, which are mechanically complex parts, are made of cast metal, they can be manufactured relatively easily. It is shown,
In this example, the tapered portion 7 is also included in the friend case 2C.
is made of sheet metal. Well, since only the 7-lunge 6.8 is made of cast metal, this converter will lead to further weight reduction.In this case, the catalyst layer side Ifi
From the IH department, taper section 7. A separate holding member 9 made of sheet metal is provided at the location where the sealing member 5 is held. In this example, instead of using the holding member 9 of the above-mentioned second embodiment, the holding part 10 is simply formed on the tubular nurse 2C itself, and other differences are as follows. Therefore, the details are omitted〇In addition, for each example Kj#-, the cylindrical case 2
Both ends sOa of C are formed by bending their tips.This is to improve the O-bondability between the cylindrical case 2C, the exhaust gas introduction part 2m, and the exhaust gas discharge part 2b after Korean casting. , Contributes to ensuring sealing performance.〇 As mentioned above, the catalyst container A of the present invention uses both sheet metal and casting as the material of the d1 container.
The container and the catalytic converter can be made lighter than those made of only cast metal, and sheet metal parts (cylindrical nurses) can be used.
Since the and casting 11 members (exhaust gas introduction part and !lP output gas exhaust tiS part) are integrated by casting, there is no need to pay attention to dimensional accuracy compared to those made of sheet metal only, and it is easy to use when cooling. It is possible to improve the tightness and sealability of the parts.゛In addition, since sheet metal with relatively excellent durability at high temperatures and casting with excellent machinability can be used in appropriate positions of the container,
It is possible to manufacture a catalytic converter with excellent performance, and it is also convenient for manufacturing.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view showing the first embodiment of the present invention, FIG. 2 is a similar sectional view of the second embodiment, and FIG. 3 is a similar sectional view of the third embodiment. Contribute. 1...Catalyst 2...Container 2a...Exhaust gas introduction part 2b...Exhaust gas discharge part 2c...Cylindrical case 6...Inlet mounting 72 nge 8...Outlet mounting 7 lunge Patent applicant Toyota Motor Corporation ~i,1
1'''l Figure 3

Claims (1)

[Scope of Claims] A catalytic converter in which a catalyst is held in a container is provided with an exhaust gas including an inlet mounting 7 flange of the container, an exhaust gas discharge portion including a gas introduction part and an outlet mounting 72 flange, both of which are N.
The cylindrical case between the introduction part and the outlet part is made of sheet metal. A catalytic converter characterized in that the other end of the case is integrated with the other end of the case by casting.