JP4179986B2 - CORE PIECE OF EXHAUST CATALYST DEVICE, ITS MANUFACTURING METHOD, AND INSERTION AND FIXING METHOD THEREOF - Google Patents

Description

  The present invention relates to an apparatus for purifying combustion gas discharged from various internal combustion engines, and particularly to a core piece provided inside an outer cylinder and having a catalyst for purifying action attached to the surface. It is concerned.

In general, in an engine that obtains mechanical power by exploding and burning oil in a cylinder, harmful gases such as CO (carbon monoxide), HC (hydrocarbon), and NO _x (nitrogen oxide) are contained in the exhaust gas. Therefore, a catalyst device (purification device) that reduces this kind of harmful substances is incorporated in the exhaust gas discharge path such as a muffler and an exhaust pipe.
As this catalyst device, for example, as shown in FIG. 12 (a), there is a monolith type device in which a core piece 3 'whose cross section is formed in a honeycomb shape is fitted into an outer cylindrical body 2'. While flowing the gas along the core piece 3 ', the exhaust gas is purified by bringing it into contact with a catalyst metal such as platinum or rhodium previously deposited on the channel wall surface. The core piece 3 'is formed in a honeycomb shape in order to increase the contact area (surface area) with the exhaust gas and improve the purification performance.

  However, in manufacturing the honeycomb core piece 3 ', there are the following problems. That is, in order to manufacture the core piece 3 'as shown in FIG. 12 (a), for example, a flat plate and a corrugated metal plate material are overlapped, and then wound into a coil shape until a desired size is obtained. The core piece 3 'is obtained, but in such a method, even when only the core piece 3' is manufactured, a plurality of components are required, and the number of processes tends to increase due to the increase in the number of members. This may lead to high cost and weight of the device.

For this reason, the present applicant, as shown in FIG. 12 (b) as an example, presses a pipe-shaped member to form a flare tube F having a plurality of pleats, and uses this to produce a core piece having a large surface area. A technique for producing 3 'has been developed and a patent application has been filed (for example, see Patent Document 1). In this Patent Document 1, the core piece 3 'can be manufactured relatively easily because the pipe-shaped member is mainly used as the starting material of the core piece 3', and the core piece 3 'is formed using a plurality of flare pipes F. Even if it exists, since it is possible to use the pipe-shaped member of the same diameter as a starting material, the corresponding effect is achieved in cost reduction etc.
However, in this type of automobile-related parts industry, there are always demands for cost and weight reduction, and even with catalytic devices, not only high purification performance but also further weight reduction and low Manufacturing methods for realizing cost reduction are intensively studied every day.
JP 2003-113711 A

The present invention was made as part of such research and development, and the core piece accommodated in the outer cylinder is formed from a blank material , and can be elastically attached to the outer cylinder by the core piece itself, This is an attempt to develop a new exhaust gas catalyst core piece, a manufacturing method thereof, and an inserting and fixing method thereof which can reduce or eliminate the joining such as brazing and welding later.

That core piece of the exhaust gas catalytic converter according to claim 1 is provided inside the exhaust gas outer cylinder body (G) comes fed (2), the catalyst is deposited on the surface, the exhaust gas (G) In the core piece (3) of the exhaust gas catalytic device (1) to be purified,
The core piece (3) is formed by using a single blank material (B) as a starting material, and appropriately bending it to form a spring-like opening / closing part (10) formed oppositely at both ends of the blank material (B). The spring-like opening / closing part (10) is formed in a cross-sectional shape having a spring property imparting part (11) capable of elastically opening and closing,
When attaching the core piece (3) to the outer cylindrical body (2), the spring-like opening / closing part (10) is brought into elastic contact with the inner surface of the outer cylindrical body (2) so that It is characterized by the fact that it is intended to be mounted.

Further, the core piece of the exhaust gas catalyst device according to claim 2 is characterized in that, in addition to the requirement of claim 1 , the blank material (B) is formed with corners of four corners.

According to a third aspect of the present invention, there is provided a method for producing a core piece of an exhaust gas catalytic device, wherein the exhaust gas (G) is provided in the outer cylinder (2) into which the exhaust gas (G) is fed, and the exhaust gas is produced by a catalyst adhered to the surface. In producing the core piece (3) of the exhaust gas catalytic device (1 ) for purifying (G) ,
The core piece (3) is formed by pressing one blank material (B) to form both ends of the blank material (B) in a circular shape and imparting spring properties to both ends. Thus , it is characterized in that both ends of the blank (B) can be opened and closed elastically .

According to a fourth aspect of the present invention, there is provided a method for manufacturing a core piece of an exhaust gas catalytic device, wherein the blank material (B) is formed in a corner R shape in addition to the requirements of the third aspect. Is.

According to the fifth aspect of the present invention, there is provided a method for inserting and fixing the core piece in the exhaust gas catalytic device, wherein the core piece (3) is inserted into the outer cylindrical body (2) , and the exhaust gas (G) is produced by the catalyst previously formed on the flow wall. In manufacturing equipment to purify
The core piece (3) is formed by using a single blank material (B) as a starting material, and appropriately bending it to form a spring-like opening / closing part (10) formed oppositely at both ends of the blank material (B). The spring-like opening / closing part (10) is formed in a cross-sectional shape having a spring property imparting part (11) capable of elastically opening and closing,
When attaching the core piece (3) to the outer cylindrical body (2), the spring-like opening / closing part (10) is brought into elastic contact with the inner surface of the outer cylindrical body (2) so that It is characterized by the fact that it is intended to be mounted.

According to a sixth aspect of the present invention, in addition to the requirement of the fifth aspect , the method for inserting and fixing the core piece in the exhaust gas catalytic device includes spot welding for joining the core piece (3) to the outer cylinder (2). Is further provided to further strengthen the adhesion between the two members.

The above-described problems can be solved by using the configuration of the invention described in each of the claims. That is, according to the first or third aspect of the present invention, since the elastic attachment to the outer cylinder is achieved by the cross-sectional shape of the member itself, the subsequent joining such as brazing and welding is reduced or eliminated as much as possible. To achieve further cost reduction and weight reduction.
Moreover, since a very general blank material is used as the starting material of the core piece, it is possible to greatly reduce the cost of materials and processing. In addition, since the blank is used as a starting material, various cross-sectional shapes can be realized according to the required use conditions (contact area (purification performance), weight reduction, etc.) of the exhaust gas catalyst device, and a design with a high degree of freedom can be performed. In addition, a wide variety of devices can be provided.
Furthermore, since the core piece is basically mounted by elastically abutting the spring-like opening / closing portions on both sides to the outer cylindrical body, the locked state of the mounting is made more reliable.

Further, according to the invention described in claim 2 or 4 , when exhaust gas is actually flowed to the exhaust gas catalytic device, concentration of thermal stress at the corners can be effectively prevented.

Further, according to the invention of claim 5 , since the core piece is hooked to the outer cylindrical body by the spring elasticity of the core piece itself, the joining such as brazing or welding which is usually performed to fix these both members is performed. It can be deleted or eliminated as much as possible, and the manufacturing process can be simplified and the cost of the catalyst device can be reduced.

According to the sixth aspect of the present invention, since the hooking force due to the spring elasticity of the core piece itself is used as a base, and spot welding is performed on this, the core piece and the outer cylinder are fixed (fixed) more reliably. it can. Further, when spot welding is performed, the core piece is already hooked on the outer cylinder, that is, in a temporarily fixed state, so that the welding operation can be performed smoothly and reliably.

  Hereinafter, the best mode of the present invention will be described based on the following examples. In the description, first, the exhaust gas catalyst device 1 having the core piece 3 of the present invention as one constituent member will be described, then the core piece 3 will be described, and then the core piece manufacturing method will be described. The method for inserting and fixing the core piece largely depends on the cross-sectional shape of the core piece 3, and therefore will be outlined together with the shape of the core piece 3, and then will be described comprehensively in [Other Examples] of this specification.

  First, an outline of the exhaust gas catalytic device 1 to which the core piece 3 of the present invention can be applied will be described. The exhaust gas catalytic device 1 purifies the exhaust gas G discharged from the engine after combustion before it is released into the atmosphere. For this reason, the exhaust gas catalytic device 1 has a catalyst for reducing harmful substances on the channel wall surface. (Catalyst material) is deposited in advance, and the exhaust gas G contacts with the catalyzer material and is purified while passing through the interior of the exhaust gas catalytic device 1.

  As shown in FIG. 1 as an example, such an exhaust gas catalyst device 1 includes an outer cylindrical body 2 opened in the front-rear direction and a core piece 3 provided inside the outer cylindrical body 2. The core piece 3 is formed so as to ensure a contact area with the exhaust gas G as appropriate. In the present invention, the core piece 3 is formed from the blank material W. Incidentally, the above-described catalyzer substance is attached to the inner and outer surfaces of the core piece 3 and the inner side of the outer cylinder 2.

  Next, the detailed shape of the core piece 3 will be described. The cross-sectional shape of the core piece 3 is formed in such a shape that when a deformation is applied to the inside, the core piece 3 returns to the outside. In other words, the core piece 3 is formed as a cross-sectional shape having a spring action that returns the inner pressure to the outer side. For this reason, the core piece 3 is elastically attached to the outer cylindrical body 2 by the cross-sectional shape of the member itself, and is assembled in close contact with the outer cylindrical body 2.

And in this invention , the core piece 3 which has such a spring effect | action is formed by bending appropriately from one metal plate material (this is made into the blank material B). Specifically, both ends of the blank B are rounded so that they can be opened and closed (expanded) elastically, and the core piece 3 is hooked on the outer cylinder 2 by spring-like expansion of both ends. It is something to be made. Here, both end portions of the core piece 3 that can be expanded and contracted in the completed state are referred to as spring-like opening / closing portions 10.

On the other hand, the central part of the core piece 3 that connects the spring-like opening / closing part 10 is a spring imparting part 11 in order to give a spring action to both ends, and is formed in a substantially heart shape in this embodiment. . That is, in the present embodiment, the heart-shaped acute angle tip portion is made non-contact, and the spring-like opening / closing portion 10 is provided opposite thereto. In the center of the substantially heart-shaped portion, a recess that is relatively large inside the heart-shaped cross section is formed. This is a configuration for securing a contact area with the exhaust gas G (this is a contact surface). The acquisition unit 12).
As described above, in this embodiment, the cross section of the core piece 3 is a shape in which both ends of a circular shape are connected in a substantially heart shape, and this shape itself is conventionally a technology that ensures a surface area by repeating the same pattern. Compared to the common cross-sectional configuration (see FIG. 12), it can be said that the cross-sectional shape is extremely new and unusual.

  The spring-like opening / closing part 10 of the core piece 3 is formed so as to be separated and counteracted in an unloaded state. When the core piece 3 is fitted into the outer cylinder 2, the spring-like opening / closing part 10 is brought close to the core piece 3 3 is inserted into the outer cylinder 2 so as to narrow the size (outer shape). After that, when the approach between the spring-like opening / closing parts 10 is released, the spring-like opening / closing part 10 expands outward due to spring elasticity and firmly contacts the outer cylinder 2, so that the attachment with the outer cylinder 2 is performed. Is planned.

  As described above, in the present invention, the core piece 3 is elastically attached to the outer cylindrical body 2 depending on the cross-sectional shape of the core piece 3, and the stronger the latching force (attachment force), the more the members are fixed thereafter. Thus, joining such as brazing or welding can be reduced or eliminated as much as possible, and as a result, further cost reduction can be achieved. When brazing or the like is required to fix the core piece 3, the attachment of the core piece 3 to the outer cylindrical body 2 by spring elasticity is mainly responsible for pre-temporary fixing or positioning based on brazing. is there. Further, when brazing is performed in a state where the core piece 3 is positioned, the work can be easily and reliably performed.

  As described above, the core piece 3 is engaged with the outer cylinder 2 by the spring elasticity generated by its own cross-sectional shape, but the exhaust gas catalytic device 1 is exposed to the high temperature / exhaust gas G during use. It is subject to repeated heat loads. In consideration of this, it is preferable to further strengthen the fixation between the core piece 3 and the outer cylindrical body 2. For this reason, in addition to the elastic latching (attachment) of the core piece 3, for example, as shown in FIG. A fixed insertion method in which spot welding is performed at an appropriate position is desirable. Here, as an example, spot welding is applied to one spring-like opening / closing part 10 at two locations (a total of four locations on both sides). In other words, since the cross-sectional shape of the core piece 3 itself has a latching force (adhesion force) similar to that of the retaining piece, even in spot welding, that is, spot welding for joining in a narrow range, it is a reliable fixing and strengthening means. Is.

Since the core piece 3 has a tendency to spread outward, it is easy to come into contact with the outer cylindrical body 2, which makes spot welding easy and reliable.
In addition, spot welding is applied to the spring-like opening / closing portion 10 here, and this portion is formed in a relatively large circular shape, so that a wide contact portion with the outer cylindrical body 2 can be secured accordingly. It is. Therefore, the part to be spot welded is not necessarily limited to the spring-like opening / closing part 10, and can be applied to an appropriate part according to the cross-sectional shape of the core piece 3.

  Further, as shown in FIG. 1, the exhaust gas catalyst device 1 is often incorporated in an exhaust silencer unit A (so-called muffler), but is not necessarily limited to the exhaust silencer unit A when installed in a vehicle or the like. For example, it can be incorporated in the exhaust pipe between the engine and the exhaust silencer unit A. In addition, for this reason, it is not always necessary to form the outer cylinder 2 as a separate member from the exhaust silencer unit A. For example, a part of the exhaust pipe is applied as the outer cylinder 2, and a core piece is formed inside the outer cylinder 2. It is possible to incorporate only 3 or a form in which only the core piece 3 is fitted in one chamber in the muffler (exhaust silencer unit A) is possible.

The core piece 3 of the present invention has the basic structure as described above, and a method for manufacturing such a core piece will be described below.
(1) Supply of blank material [see FIG. 2 (a), FIG. 3 (a)]
This step is a step of sequentially transferring the blank material B punched out from a metal material having a substantially constant thickness to an appropriate size (about one core piece) to a bending machine. At this time, as shown in FIG. 2A, for example, the blank material B to be conveyed is preferably connected to the adjacent ones at about one place, which ensures the blank materials B one by one. It is the structure for transferring to a bending process. In addition, in the said FIG. 2 (a), it has shown so that the center parts of the blank material B may be connected, and let this be the connection part J. FIG.

(2) Bending process (first stage) [see FIG. 2 (b), FIG. 3 (b)]
This process is the first stage of the bending process, and is a process of forming the contact surface acquisition part 12 in the substantially central part of the blank material B and forming an inclined portion from this part to both ends to be circular later. is there. The inclined portion is formed in a wing shape with respect to the contact surface acquisition portion 12, and is referred to as a wing portion W. Moreover, the connection part J is completely cut off with the blank material B with the formation of the contact surface acquisition part 12 and the like. In addition to this bending process, it is preferable that the blank material B is corner-curved or chamfered at the four corners, in order to prevent concentration of thermal stress at this part when the core piece 3 is actually used. is there.

(3) Bending process (second stage) [see FIG. 2 (c), FIG. 3 (c)]
This process is the second stage of the bending process, and is a process of bending and forming both end portions of the blank material B in a raised state with respect to the wing portion W. This is a process for facilitating the formation of both ends in a circular shape.

(4) Bending process (third stage) [see FIG. 2 (d), FIG. 3 (d)]
This process is the third stage of the bending process, and is a process of bending the wing part W with respect to the contact surface acquisition part 12 and forming it in a raised state.

(5) Bending process (fourth stage) [see FIG. 2 (e) and FIG. 3 (e)]
This step is the fourth step of the bending step, and is a step of rounding the wing portion W formed by bending the contact surface acquisition portion 12 into a circular shape as a whole. The shape (circular shape) of the spring-like opening / closing part 10 is substantially formed at this stage.

(6) Bending process (fifth stage) [see FIG. 2 (f), FIG. 3 (f)]
This process is the fifth stage of the bending process, and here, the springiness imparting portion 11 is formed in a substantially heart shape. At this time, the spring-like opening / closing part 10 is formed so as to be separated and separated, and enables elastic opening / closing (expansion).

  Then, in order to fit the core piece 3 formed in this way into the outer cylindrical body 2, as described above, the opposing spring-like opening / closing portions 10 are brought close to each other so as to press each other, and the size (outer shape) of the core piece 3 is reduced. It is inserted into the outer cylinder 2 in a reduced state. Thereafter, when the approach between the spring-like opening / closing parts 10 is released, the spring-like opening / closing part 10 expands outward due to spring elasticity and firmly contacts the outer cylinder 2, so that the elastic attachment (hanging) between both members is performed. Stop). Further, in a state where the core piece 3 is housed in the outer cylindrical body 2, it is preferable that the spring-like opening / closing portions 10 at both ends are substantially in contact with each other so that the latching between these two members becomes stronger. That is, in a state where the core piece 3 is fitted in the outer cylindrical body 2, it is preferable that the size (outer shape) of the core piece 3 is regulated from both the outer side and the inner side.

The core piece 3 of the present invention is formed from the blank material B through the processes as described above, but the bending process is not limited to the above-described five stages, but according to the size, desired shape, etc. of the blank material B. Of course, it is possible to go through other stages along the way.
In addition, it is common that the catalyzer material is formed in close contact with the formed core piece 3 after being fitted into the outer cylindrical body 2 through such a process, but first on the inner and outer surfaces of the core piece 3. It is also possible to form the catalyzer material in close contact and fit it into the outer cylinder 2.
[Other Examples]

  The present invention is based on the embodiment described above as a basic technical idea, but the following modifications can be considered. That is, in the embodiment shown in FIGS. 1 to 3, an example in which one core piece 3 is accommodated in one outer cylinder 2, a plurality of core pieces 3 are provided in one outer cylinder 2. You can store it. For example, for a relatively long pipe-shaped outer cylinder 2, several short core pieces 3 can be provided in series in the longitudinal direction (see FIG. 11).

  Further, for example, as shown in FIG. 4, a hole 13 having an appropriate size can be formed in the core piece 3. This is a configuration mainly employed for the purpose of reducing the weight, but an effect of acquiring a larger contact area with the exhaust gas G can also be expected. In addition, since the rigidity of the spring property imparting part 11 that connects the spring-like opening / closing part 10 is somewhat weakened by opening the hole 13, such an opening can be actively used for adjusting the spring strength. It is. Furthermore, for this reason, the holes 13 do not necessarily have to be formed entirely in the core piece 3 and may be partially provided in the spring imparting portion 11 or the like. Incidentally, in order to obtain the core piece 3 in which the holes 13 are opened, it is general to open the appropriate holes 13 in advance at the stage of the blank material B and bend them appropriately to obtain the desired-shaped core piece 3. is there.

In addition to the shapes shown in FIGS. 1 to 4, various shapes can be adopted as the cross-sectional shape of the core piece 3, for example, a substantially M type (W type) shown in FIG. A substantially U-type (V-type) shown in 5 (d) is also possible. If the tip of the spring-like opening / closing part 10 does not protrude greatly to the outside, it may be rolled either on the outside or on the inside as shown in FIGS. 5 (c) and 5 (d). Incidentally, the substantially C type shown in FIG. 5A and the substantially S type shown in FIG. 5B are reference examples related to the present invention.

Moreover, the core piece 3 of the present invention shown in FIGS. 1 to 5 was formed so that both end portions of the blank material B could be bent in a spring shape, and were hooked on the outer cylinder 2. However, in the point that the core piece 3 is formed from a single blank B, for example, as shown in FIG. 6 (a) , the core piece 3 is mainly formed so that only one end side can be bent. is to it it is thought.
The cross section of the core pieces 3, for example, as shown in FIG. 6 (b), formed in a spiral shape, with a repulsive force to the overall tightening of core pieces 3, even that is considered to be hooked on the outer cylinder 2 . 6A and 6B are also reference examples related to the present invention.

Furthermore, the core pieces 3 shown in FIGS. 1 to 6 are all formed from a single blank material B , but if only the spring property is imparted to the core pieces 3, for example, as shown in FIG. It is also conceivable that one pipe-shaped member is used as a starting material, and this is appropriately pressed to form the core piece 3 having a spring property. In this case, since the core piece 3 has no end portion, the overall rigidity is strong, and it is estimated that a relatively large force is required to bend the member itself. It is possible to appropriately adjust the force required for bending and the amount of bending by making a hole 13 in the property imparting portion 11) or the like. However, FIG. 7 is also a reference example related to the present invention.

Next, an insertion / fixing method for fixing the core piece 3 after inserting it into the outer cylinder 2 will be described generally. In the basic embodiment described above, the latching force due to the spring elasticity of the core piece 3 is used as a base, and spot welding is appropriately applied thereto, thereby strengthening the fixing (prevention) between the core piece 3 and the outer cylindrical body 2. However, in order to make the insertion and fixing of the core piece 3 more reliable, the outer cylindrical body 2 into which the core piece 3 is inserted is crimped into a reduced diameter state, and the fixation is made more firm. Is possible. Specifically, as shown in FIG. 8 as an example, the both ends of the opening and the body (substantially the center) of the outer cylinder 2 are caulked so as to be narrowed over the entire circumference. At this time, caulking (diameter reduction processing) applied to both ends of the opening of the outer cylindrical body 2 is applied only to a portion where the core piece 3 does not exist, that is, the outer cylindrical body 2. The storage position of the core piece 3 is restricted from both the left and right sides by deformation to prevent the core piece 3 from coming off. On the other hand, the caulking (reducing diameter processing) applied to the body portion of the outer cylindrical body 2 is applied so that the portion in which the core piece 3 is present, that is, the outer cylindrical body 2 bites into the inner side together with the core piece 3. Both members are firmly fixed, and the core piece 3 is more reliably prevented from coming off.
In FIG. 8, in addition to the spring elasticity and spot welding of the core piece 3, the outer cylindrical body 2 is further crimped. However, the fixing force is enhanced by the spring elasticity of the core piece 3 and the crimping to the outer cylindrical body 2. If it can be achieved sufficiently, spot welding can be omitted.

In addition, when caulking the outer cylinder 2 inward, various forms other than the form shown in FIG. 8 can be adopted. Hereinafter, variations of the caulking method will be described.
First, the caulking method shown in FIG. 9A narrows only both ends of the opening of the outer cylindrical body 2, thereby positioning the core piece 3 from both sides to prevent it from coming off. FIG. 9B shows a caulking method for narrowing only one end side of the outer cylinder 2, which is particularly suitable when the outer cylinder 2 and the core piece 3 are tapered pipes. Conceivable. That is, in this case, the positioning of the core piece 3 on the small diameter end side is made by the shape (taper) of the member itself, and the both sides of the core piece 3 are substantially regulated by narrowing only the large diameter end side. It is. Further, what is shown in FIG. 9C is a caulking method in which only the body portion (substantially central portion) of the outer cylinder 2 is narrowed together with the core piece 3. Also, what is shown in FIG. 9D is a caulking method in which one end side of the outer cylindrical body 2 and the body portion of the outer cylindrical body 2 are partially narrowed. As described above, the narrowing at the opening end portion and the body portion of the outer cylindrical body 2 is not necessarily performed on the entire circumference, and may be performed partially.

  Further, the caulking method shown in FIG. 10A is an example in which the body portion of the outer cylindrical body 2 is subjected to staggered arrangement, and here, the upper and lower sides, the left and right, the upper and lower sides are alternately caulked. . Further, the caulking method shown in FIG. 10B is an example in which a spiral caulking is applied to the body portion of the outer cylindrical body 2. In this case, it is conceivable that the exhaust gas G passing through the outer cylindrical body 2 forms a swirling flow along the caulking of the spiral shape to some extent, which makes it easier to come into contact with the catalyzer substance, thereby improving the purification efficiency. Improvement can be expected. Here, the spiral shown here has a relatively large lead angle, but various settings may be adopted for the spiral lead angle, the number of strips, the pitch, and the like. Further, the caulking method shown in FIG. 10C is an example in which caulking is linearly performed so as to be substantially along the longitudinal direction of the outer cylindrical body 2. In this case, for example, as shown in the cross-sectional view, the deformed portion caused by caulking is bitten into the concave portion (substantially heart-shaped concave portion) of the core piece 3, and this portion is expanded so that the spring imparting portion 11 is expanded. Etc. can be strongly pressed against the outer cylinder 2 from the inside, and an increase in the latching force can be expected.

Moreover, although what was shown to the said FIGS. 8-10 demonstrated the caulking method which mainly accommodates the one core piece 3 in the one outer cylinder 2, as above-mentioned, in one outer cylinder 2, there are several It is also possible to store the core piece 3. For example, as shown in FIG. 11, when two short core pieces 3 are provided in series in the longitudinal direction for one outer cylinder 2, the caulking applied to the body portion of the outer cylinder 2 is The core piece 3 can be applied so as not to be deformed. That is, the caulking to the body portion is applied to a portion where the core piece 3 does not exist, like the caulking at both ends of the opening, and the housing position of the core piece 3 is restricted from both sides by deforming only the outer cylindrical body 2 inward. It is possible to prevent it from coming off. Of course, the caulking applied to the body portion can also be performed at a portion where the core piece 3 is present, that is, so as to push the core piece 3 inward.
When a plurality of core pieces 3 are fitted into the outer cylindrical body 2, it is possible to arrange the phases as appropriate to be different from each other in order to improve the contact efficiency between the exhaust gas G and the catalyst (catalyst material). It is. Incidentally, in FIG. 11, the left and right core pieces 3 are housed with the phase as a cross section shifted by 180 degrees. Of course, when a plurality of core pieces 3 are included, it is also possible to insert core pieces 3 having completely different cross-sectional shapes.

It is a perspective view which shows the exhaust gas catalyst apparatus incorporating the core piece of this invention product, and the exhaust gas silencer unit formed by applying this exhaust gas catalyst apparatus. It is a perspective view which shows the manufacturing process of a core piece in steps. It is sectional drawing same as the above. It is a perspective view which shows the core piece which formed the hole. It is sectional drawing (a) * (b) of the core piece considered as a reference example relevant to this invention, and sectional drawing (c) * (d) which shows the other Example of the core piece of this invention. It is sectional drawing of the core piece considered as a reference example relevant to this invention . It is sectional drawing which shows the core piece formed from the pipe-shaped member as a reference example relevant to this invention . It is explanatory drawing which notches and shows partially the exhaust gas catalyst apparatus which caulked the outer cylinder body inside. It is sectional drawing which shows the various crimping methods of an outer cylinder body. It is a perspective view which further shows the various crimping methods of an outer cylinder. It is sectional drawing which shows the caulking method at the time of inserting a several core piece in an outer cylinder. It is sectional drawing which shows the conventional exhaust gas catalyst apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust gas catalyst apparatus 2 Outer cylinder 3 Core piece 10 Spring-like opening-and-closing part 11 Spring property provision part 12 Contact surface acquisition part 13 Hole A Exhaust silencer unit B Blank material F Flare pipe G Exhaust gas J Connection part W Wing part

Claims (6)

The core piece (3) of the exhaust gas catalyst device (1) that purifies the exhaust gas (G) by the catalyst that is provided inside the outer cylinder (2) to which the exhaust gas (G) is sent and is attached to the surface. In
The core piece (3) is formed by using a single blank material (B) as a starting material, and appropriately bending it to form a spring-like opening / closing part (10) formed oppositely at both ends of the blank material (B). The spring-like opening / closing part (10) is formed in a cross-sectional shape having a spring property imparting part (11) capable of elastically opening and closing,
When attaching the core piece (3) to the outer cylindrical body (2), the spring-like opening / closing part (10) is brought into elastic contact with the inner surface of the outer cylindrical body (2) so that A core piece of an exhaust gas catalyst device, characterized in that the attachment is intended.
It said blank (B) is core piece of the exhaust gas catalytic converter according to claim 1, wherein a corner portion is formed at the corner R shape.
The core piece (3) of the exhaust gas catalyst device (1) that purifies the exhaust gas (G) by the catalyst that is provided inside the outer cylinder (2) to which the exhaust gas (G) is sent and is attached to the surface. In manufacturing
The core piece (3) is formed by pressing one blank material (B) to form both ends of the blank material (B) in a circular shape and imparting spring properties to both ends. A process for producing a core piece of an exhaust gas catalyst device , characterized in that both ends of the blank material (B) can be opened and closed elastically .
The said blank material (B) is formed in the corner R shape at the four corners, The manufacturing method of the core piece of the exhaust gas catalyst apparatus of Claim 3 characterized by the above-mentioned.
In manufacturing a device for purifying the exhaust gas (G) by interpolating the core piece (3) with respect to the outer cylindrical body (2) and preliminarily formed on the flow path wall surface,
The core piece (3) is formed by using a single blank material (B) as a starting material, and appropriately bending it to form a spring-like opening / closing part (10) formed oppositely at both ends of the blank material (B). The spring-like opening / closing part (10) is formed in a cross-sectional shape having a spring property imparting part (11) capable of elastically opening and closing,
When attaching the core piece (3) to the outer cylindrical body (2), the spring-like opening / closing part (10) is brought into elastic contact with the inner surface of the outer cylindrical body (2) so that A method of inserting and fixing a core piece in an exhaust gas catalyst device , characterized in that the attachment is intended.
To the outer cylindrical body (2) performs further spot welding for joining the core pieces (3), according to claim 5, characterized in that so as to further strengthen the fixation between the two members, the exhaust gas A method of inserting and fixing a core piece in a catalyst device.

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