JPS6024286B2 - How to assemble a catalytic converter for exhaust gas purification - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1-Field of Industrial Application) The present invention relates to a method for attaching silk to a catalytic converter for exhaust gas purification installed in an exhaust pipe or the like of an internal combustion engine.

'21 Related technology A known catalytic converter for exhaust gas purification is one in which a cylindrical monolithic catalyst is supported in a casing via a cushion body.
Although it has been widely used in practical use, the conventional method for thinning this catalytic converter is to insert a widening insertion hole into one end of a hollow cylindrical casing main body 01 that is straight to both ends, as shown in Figures 3 and 4. Connect the equipped insertion jig J', insert the catalyst carrier 04 whose outer periphery is covered with the cushion body 05 from one end of the casing body 01 through this jig J', and hold the carrier 04 by the casing body 05. This method was adopted.

(Refer to Samurai Publication No. 49-72173) '3} Problems to be Solved by the Invention In the conventional method, the insertion mechanism U' is inserted into the end of the casing main body 01 while compressing the cushion body 05 in the radial direction. Since it serves as a guide for smooth guidance and transition, the cushion body 05 is inserted by taking into account dimensional errors in machining of the casing body 01, etc., so that the cushion body 05 does not interfere with the end face of the casing body 01 during the transition. The minimum inner diameter A' of the insertion hole of the jig J' must be set sufficiently smaller than the inner diameter B' of the casing main body 01, so that the
5 will be over-compressed by the insertion jig J' beyond the required compression amount, which will increase the insertion resistance and cause a problem with the fineness of the catalyst carrier 04. The catalyst support member 04 may be damaged at the time of insertion into the jig J', and furthermore, the contact surface between the cushion member 05, on which the insertion resistance directly acts, and the catalyst support member 04 that attempts to forcefully push it. A strong sea bream shearing force acts on the catalyst carrier 04, causing the relative position of the two to shift in the longitudinal direction, or the cushion body 05, which has been overcompressed and has decreased cushioning properties, undergoes early fatigue, resulting in early failure of the fragile catalyst carrier 04. may be invited.

Furthermore, in a catalytic converter thinned by the conventional method, anticipating the shift in the relative longitudinal position between the cushion body 05 and the catalyst carrier 04, as shown in FIG. Metal fittings 08 and cushion body 05
In order to reduce interference with the catalytic converter, the catalytic converter is fixed to the casing main body 01 at a sufficient distance from its end, resulting in problems such as an increase in the overall length of the catalytic converter. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for roughening a catalytic converter for exhaust gas purification, which eliminates such problems. B. Structure of the Invention {1} Means for Solving the Problems The present invention connects an insertion jig with an insertion hole that widens out to the end of the main body of the casing, which has a hollow cylindrical shape. For exhaust gas purification, a monolithic sardine soot carrier whose outer periphery is covered with a cushion body is inserted from one end of the casing body through a jig, and the carrier is held within the casing body via the cushion body. In the method for attaching a catalytic converter, a large-diameter portion is integrally formed at at least one end of the casing main body via a neck sloping portion, and the inner diameter of the insertion hole is set at the maximum diameter of the large collar portion. The diameter is 4 mm larger than the inner diameter and larger than the inner diameter of the central part of the casing main body, and when the catalyst carrier is inserted into the casing main body, the cushion body covering the catalyst carrier is first inserted into the insertion hole. The cushion body is subjected to primary compression in the radial direction and inserted into the large casing part, and then the cushion body after the primary compression is subjected to secondary compression in the radial direction in stages by the stepped part, and then inserted into the central part of the casing main body. It is characterized by being made to do.

{2) When inserting the working catalyst carrier into the casing main body, the cushion body covering the outer periphery of the catalyst carrier is first compressed by the insertion hole of the insertion jig and moves into the large diameter portion of the casing main body, and then It moves to the central part of the casing main body while being secondarily compressed in stages by the forehead inclined step part of the casing main body.

At this time, since the smallest inner flea of the insertion hole of the insertion paint is smaller than the inner diameter of the large diameter part of the main body of the casing, the cushion body can be inserted into the large flea part of the main body of the casing smoothly without being obstructed by the machine surface of the main body of the casing. In addition, since the minimum inner diameter of the insertion hole is larger than the inner diameter of the central part of the casing main body, depending on the insertion jig, the cushion body may be overcompressed in the radial direction, that is, the central part of the casing main body may be overcompressed. It will not be compressed to a diameter smaller than the inner diameter of the [3' Examples below,
Embodiments of the present invention will be described with reference to the drawings.
The figure shows a partially longitudinal side view of a catalytic converter roughly assembled by the assembly method of the present invention, and FIG. 2 shows its initial state.

A large-diameter portion 3 is formed at both ends of a hollow cylindrical casing main body 1 that is open at both ends and forms the main body of the casing Ca of the catalytic converter, with a mirror slanted portion 2 that widens outward. . The insertion jig J for inserting the catalyst carrier 4 into the casing main body 1 together with the cushion body 5 includes:
The insertion hole 13 is formed in a circular shape, and the insertion hole 13 is formed into a curved slope whose inner diameter gradually increases from the proximal end surface to the distal end surface, and the minimum inner diameter A thereof is defined by the casing main body 1.
It is set to be larger than the inner diameter B of the central part of the inner diameter B and smaller than the inner diameter C of the large groove part 3, that is, the relationship B<A<C.

Further, an annular groove 6 is formed on the inner circumferential surface of the base of the insertion tube J to which the large flap part 3 of the casing main body 1 can be connected. The monolithic catalyst carrier 4 is formed into a cylindrical honeycomb structure, and the outer periphery of the monolithic catalyst carrier 4 is covered with a wire mesh cushion body 5.

Next, to explain the attaching order of the catalytic converter of the present invention, as shown in FIG. do.

Next, the catalyst carrier 4 whose outer periphery has been covered with a cushion body 5 is passed through the insertion odor control J into the casing main body 1.
Insert inside. In this case, the cushion body 5 on the outer periphery of the catalyst carrier 4 is primarily compressed in the radial direction by the inner circumferential surface of the insertion jig J until it reaches the large diameter portion 3 of the casing main body 1, and is further stepped by the dominant step portion 2. The catalyst body 4 is inserted into the center of the casing main body 1 while being subjected to secondary compression, and the catalyst body 4 is supported therein in a cushioning manner via a cushion body 7. Furthermore, an annular end face presser fitting 8 having a channel-shaped cross section is fixed to the inner surface of the large flap portion 3 at both ends of the casing main body 1 via an annular end face cushion body 7 . In this case, the end face presser fitting 8 is welded to the inner surface of the large diameter portion 3 with its outer peripheral flange piece 8' facing inward. Finally, cone-shaped terminal cases 11 and 12 with the outlet 9 or inlet 10 closed are welded to both closed ends of the casing main body 1 to complete the attachment of the catalytic converter. In the above embodiment, a case has been described in which the large diameter portions 3 are formed at both ends of the casing main body 1, but the large diameter portion 3 may be formed only on one side of the casing main body 1.

Further, the outer peripheral flange piece 8' of the end face presser fitting 8 may be welded to the inner surface of the large flap portion 3 facing outward. C. Effects of the Invention As described above, according to the present invention, when inserting the soot carrier into the main body of the casing, the cushion body that covers the catalyst carrier is first compressed in the radial direction by the insertion hole of the insertion jig, thereby compressing the main body of the casing. The cushion body after the primary compression is then compressed stepwise in the radial direction by the stepped part of the main body of the casing, and inserted into the central part of the main body of the casing. Since the minimum inner diameter of the hole is set smaller than the inner diameter of the large casing main body, the cushion body can be smoothly inserted into the casing main body without being hindered by the end face of the casing main body, as in the conventional method. Moreover, since the minimum inner diameter of the insertion hole is set larger than the inner diameter of the central part of the main body of the casing plug, the cushion body will not be overcompressed in the radial direction depending on the insertion jig.

In particular, since the cushion body is not over-compressed, (1) the catalyst carrier can be inserted smoothly into the center of the main body of the casing together with the cushion body with less insertion resistance, and the insertion work becomes easier and work efficiency can be increased; (2)
Since the insertion resistance is small, even in the case of a broadside soot carrier with a large external tolerance, there is no risk of damaging the catalyst when inserted into the odor control system. There is little risk of misalignment of the longitudinal relative positions of the soot carrier and the catalyst carrier, and the cushion body can be accurately positioned within the casing main body to stably hold the soot carrier. ■The cushion body can be provided with appropriate cushioning properties to accurately cushion and support the fragile sardine soot carrier, and the durability of both the cushion body and the catalyst carrier can be increased.■Cushion body as mentioned in (■) above. Since it is possible to accurately position the inside of the casing body,
Even if the end face holding metal fitting of the catalyst carrier is fixed to the casing as close as possible to the cushion body, it will not interfere with the end face of the cushion body, and as a result, the overall length of the catalytic converter can be shortened and it can be made compact. Excellent effects such as being able to do this can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal side view of a carrier converter roughened by the tying method of the present invention, Fig. 2 is a sectional view showing the state of the soot carrier according to the method of the present invention when inserted into the casing, and Fig. 3 is a FIG. 4 is a partially longitudinal side view of a conventional catalytic converter, and is a sectional view showing a state in which a soot carrier is inserted into a casing according to a conventional method. J... Insertion vulgar smell, 1... Mainly casing, 2...
Neck slope part, 3... Large ridge part, 4... Broad soot carrier, 5...
- Cushion body, 13...insertion hole. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. An insertion jig equipped with a widening insertion hole was connected to the end of the casing main body having a hollow cylindrical shape, and the outer periphery of the casing body was covered with a cushion body through the insertion jig from one end of the casing main body. In the method for assembling a catalytic converter for exhaust gas purification in which a monolithic catalyst carrier is inserted and the carrier is held within the casing body via the cushion body, at least one end of the casing body is A large diameter portion is integrally formed via an inclined stepped portion, while the minimum inner diameter of the insertion hole is smaller than the inner diameter of the large diameter portion and larger than the inner diameter of the central portion of the casing main body, When inserting the catalyst carrier into the casing main body, the cushion body covering the catalyst carrier is first compressed in the radial direction through the insertion hole and inserted into the large diameter, and then the cushion body after the primary compression is inserted into the large diameter. A method of assembling a catalytic converter for exhaust gas purification, characterized in that secondary compression is performed stepwise in the radial direction by an inclined stepped portion and the converter is inserted into the center of the main body of the casing.