JP2017122416A - Exhaust device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust device which can connect tubular members of different inner diameters to each other in a largely-inclined state.SOLUTION: A second tubular member is larger in inner diameter than a first tubular member. A connection member connects the first tubular member and the second tubular member. The connection member has a first joint, a second joint and a lid plate part. The first joint is a portion to be joined to an end of the first tubular member. The second joint is a portion to be joined to an end of the second tubular member. The lid plate part covers an opening of the second tubular member on a side joined to the second joint. A first central axis, which is the central axis of the end of the first tubular member on the side joined to the first joint, is inclined to a straight line parallel to a second central axis which is the central axis of the end of the second tubular member on the side joined to the second joint. The end edge of the second tubular member on the side joined to the second joint is formed with an inclined part of a shape along a plane which is inclined to a plane perpendicular to the second central axis.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an exhaust device.

  An exhaust device that forms an exhaust passage for guiding exhaust gas discharged from an engine to the outside usually includes tubular members having different inner diameters as components. For example, Patent Document 1 discloses a configuration in which a bent cylindrical tail pipe and a cylindrical shell having an inner diameter larger than that of the tail pipe are connected by an end plate. The end plate has a shape covering the opening of the shell, and includes a first joint portion that is a portion joined to the end portion of the shell, and a second joint portion that is a portion joined to the end portion of the tail pipe. Have. In this configuration, the central axis of the shell is parallel to the central axis of the end portion of the tail pipe that is to be joined to the second joint portion.

JP 2006-342679 A

In an exhaust device including tubular members having different inner diameters, there has been a demand for connecting tubular members having different inner diameters in a greatly inclined state.
An object of one aspect of the present disclosure is to provide an exhaust device that can connect tubular members having different inner diameters with a large inclination.

  One aspect of the present disclosure is an exhaust device that forms an exhaust flow path, and includes a first tubular member, a second tubular member, and a connecting member. The second tubular member has a larger inner diameter than the first tubular member. The connecting member connects the first tubular member and the second tubular member. The connecting member has a first joint portion, a second joint portion, and a lid plate portion. The first joint portion is a portion joined to the end portion of the first tubular member. A 2nd junction part is a part joined with the edge part of the 2nd tubular member. The lid plate portion covers the opening on the side joined to the second joint portion in the second tubular member. The first central axis, which is the central axis of the end of the first tubular member that is joined to the first joint, is the end of the second tubular member that is joined to the second joint. Is inclined with respect to a straight line parallel to the second central axis. An inclined portion that is a portion of a shape along a surface inclined with respect to a plane perpendicular to the second central axis is formed at an end edge of the second tubular member on the side to be joined with the second joint portion. ing.

  According to such a configuration, since the inclined portion is formed at the edge of the second tubular member on the side to be joined with the second joint portion, the lid is formed with respect to a straight line parallel to the second central axis. The plate portion has an inclined shape. Therefore, it can be set as the structure joined in the state in which the 1st central axis inclines largely with respect to the straight line parallel to a 2nd central axis.

  One aspect of the present disclosure may be configured as follows. That is, at the edge of the second tubular member on the side to be joined to the second joint portion, there is an inclined portion and a vertical portion that is a portion along a plane perpendicular to the second central axis. Is formed. The lid plate portion includes an inclined lid portion that covers a portion on the inclined portion side in the opening, and a vertical lid portion that covers a portion on the vertical portion side in the opening. The first joint is formed on the inclined lid. According to such a configuration, the portion occupied by the inclined portion in the second tubular member can be reduced.

  In one embodiment of the present disclosure, the first joint may be formed in a cylindrical shape by burring. According to such a configuration, it is possible to make it difficult for the burring mold to interfere with the connecting member itself in the manufacturing process of the connecting member.

It is an exploded view of the exhaust apparatus of an embodiment. It is a schematic diagram of the connection member of a comparative example.

Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings.
[1. Constitution]
An exhaust device 100 shown in FIG. 1 is a device that forms a part of an exhaust passage for guiding exhaust gas discharged from an internal combustion engine (not shown) of an automobile to the outside. The exhaust device 100 includes a flange 1, an exhaust pipe 2, a connecting member 3, a catalyst 4, and a catalyst case 5. FIG. 1 shows a disassembled state in order to facilitate understanding of the shape of each component of the exhaust device 100.

  The flange 1 is a plate-like member for connecting one end of the exhaust pipe 2 to an exhaust gas outlet in the internal combustion engine. The flange 1 has a plurality of through holes 1H having an inner diameter substantially the same as the outer diameter of the exhaust pipe 2 for inserting the exhaust pipe 2 and a plurality (four in this example) for fastening to the internal combustion engine with bolts. The fastening holes are formed.

  The exhaust pipe 2 is a pipe whose cross-sectional shape perpendicular to the central axis of the exhaust pipe 2 is formed into a perfect circle (in other words, a cylindrical shape). The upstream end of the exhaust pipe 2 is joined to the flange 1 by welding while being inserted into the through hole 1H of the flange 1. The downstream end of the exhaust pipe 2 is joined to the connecting member 3 by welding. The exhaust pipe 2 forms an exhaust passage that guides the exhaust gas discharged from the internal combustion engine to the inside of the connecting member 3.

  The connecting member 3 is provided on the downstream side of the exhaust pipe 2. The connecting member 3 connects the exhaust pipe 2 and the catalyst case 5, and forms an exhaust passage that guides the exhaust gas flowing out from the exhaust pipe 2 to the catalyst case 5. The specific shape of the connecting member 3 will be described later.

The catalyst 4 is accommodated in the catalyst case 5 and purifies the exhaust gas flowing through the catalyst case 5.
The catalyst case 5 forms an exhaust passage on the downstream side of the connecting member 3 and accommodates the catalyst 4. The shape of the catalyst case 5 is such that the cross-sectional shape perpendicular to the central axis Z of the catalyst case 5 is a perfect circle (in other words, a cylindrical shape). The catalyst case 5 has an inner diameter larger than the outer diameter of the exhaust pipe 2. The specific shape of the catalyst case 5 will be described later.

Next, a specific shape and manufacturing method of the connecting member 3 will be described.
The connecting member 3 has an exhaust cylinder part 31, a case cylinder part 32, and a lid plate part 33.
The exhaust cylinder part 31 is a cylindrical part joined to the downstream end part of the exhaust pipe 2, and has a rising surface formed by burring. The inner diameter of the exhaust cylinder portion 31 is substantially the same as the outer diameter of the exhaust pipe 2 and is slightly larger than the outer diameter of the exhaust pipe 2. The exhaust cylinder part 31 and the exhaust pipe 2 are joined by welding in a state where the downstream end of the exhaust pipe 2 is inserted into the exhaust cylinder part 31.

  The case cylinder part 32 is a cylindrical part joined to the end part of the catalyst case 5. The inner diameter of the case cylinder portion 32 is substantially the same as the outer diameter of the catalyst case 5 and is slightly larger than the outer diameter of the catalyst case 5. The case cylinder portion 32 is joined to the catalyst case 5 by welding so as to cover the upstream end portion of the catalyst case 5.

  The cover plate portion 33 is a portion that covers the opening 5 </ b> H on the side of the catalyst case 5 that is joined to the case tube portion 32. The lid plate portion 33 includes an inclined lid portion 33A and a vertical lid portion 33B. The inclined lid portion 33A is a portion that covers a portion on the inclined portion 51A side described later in the opening 5H. The exhaust cylinder part 31 is formed in the inclined lid part 33A. The vertical lid portion 33B is a portion that covers a portion on the side of the vertical portion 51B described later in the opening 5H.

Here, the manufacturing method of the connection member 3 is demonstrated.
The connecting member 3 is formed from one metal (for example, stainless steel) plate material (not shown).

  Portions other than the exhaust cylinder portion 31 are formed by performing drawing processing or the like on the plate material. Specifically, the case cylinder portion 32 is formed by raising the portion for forming the case cylinder portion 32 in the plate material, and the portion other than the portion that becomes the exhaust cylinder portion 31 among the remaining portions is the cover plate. Part 33.

  The exhaust cylinder part 31 is formed by punching. Specifically, a through hole is formed at the center of the portion that becomes the exhaust tube portion 31, and the exhaust tube portion 31 is formed by performing a burring process around the through hole. In this way, the connecting member 3 is manufactured.

Next, a specific shape and manufacturing method of the catalyst case 5 will be described.
An inclined portion 51 </ b> A and a vertical portion 51 </ b> B are formed on the edge 51 of the catalyst case 5 on the side joined to the case cylinder portion 32. The inclined portion 51A is a portion covered with the inclined lid portion 33A in a state where the connecting member 3 and the catalyst case 5 are joined. The inclined portion 51A has a part of the end portion of the catalyst case 5 on the side joined to the case tube portion 32 as a central axis of the end portion of the catalyst case 5 on the side joined to the case tube portion 32 (in this example, the catalyst It is a portion of a shape along a plane inclined with respect to a plane perpendicular to the central axis Z) of the case 5.

  The vertical portion 51B is a portion covered with the vertical lid portion 33B in a state where the connecting member 3 and the catalyst case 5 are joined. The vertical portion 51 </ b> B is a portion having a shape along a plane perpendicular to the central axis Z of the end portion of the catalyst case 5 on the side joined to the case tube portion 32. The central axis X (in other words, the central axis Y1 of the exhaust cylinder part 31) of the end part of the exhaust pipe 2 on the side joined to the exhaust cylinder part 31 is the side of the catalyst case 5 on the side joined to the case cylinder part 32. It is inclined with respect to a straight line parallel to the center axis Z of the end portion (in other words, the center axis Y2 of the case cylinder portion 32). In this example, the inclination of the central axis Y1 of the exhaust tube portion 31 with respect to a straight line orthogonal to the inclined surface along the direction of the inclined portion 51A is substantially zero. That is, the exhaust cylinder portion 31 is formed vertically in the inclined lid portion 33A.

Here, a manufacturing method of the catalyst case 5 will be described.
The catalyst case 5 is formed from a single metal (for example, stainless steel) plate (not shown). The plate material is designed to have a dimension that takes into account a shape as if part of the end of the catalyst case 5 is cut obliquely with respect to the central axis Z after the molding of the catalyst case 5 (the shape described above). Has been. The catalyst case 5 is formed by rolling a plate material into a tubular shape. Specifically, the shape of the catalyst case 5 including the inclined portion 51A and the vertical portion 51B is formed by rolling the plate material. In this way, the catalyst case 5 is manufactured.

[2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(1a) The central axis X, which is the central axis of the end of the exhaust pipe 2 that is joined to the exhaust cylinder 31, is the central axis of the end of the catalyst case 5 that is joined to the case cylinder 32. It is inclined with respect to a straight line parallel to the central axis Z. An inclined portion 51A, which is a portion of a shape along a surface inclined with respect to a surface perpendicular to the central axis Z, is formed on the edge 51 of the catalyst case 5 on the side joined to the case cylinder portion 32.

According to such a configuration, since the inclined portion 51 </ b> A is formed at the end edge 51, the lid plate portion 33 has a shape inclined with respect to a straight line parallel to the central axis Z.
Therefore, it can be configured such that the central axis X in the exhaust pipe 2 is connected in a state of being largely inclined with respect to a straight line parallel to the central axis Z in the catalyst case 5.

  In particular, in the automotive field, in-head collective engines that can expand the cooling area are in an increasing trend in order to meet exhaust gas regulations that are becoming stricter year by year. As a result, the space provided for disposing the converter system in the engine compartment tends to be narrowed, and a configuration capable of smoothly guiding exhaust gas from the engine to the catalyst in such a narrow space is required. In addition, such an exhaust structure requires a simple configuration that can be realized at low cost.

  In response to such a demand, according to the exhaust device 100 of the present embodiment, the exhaust pipe 2 and the catalyst case 5 which are two tubular members having different inner diameters are joined to each other through the connecting member 3 in a greatly inclined state. It is possible to provide a simple exhaust device configuration. For this reason, in the exhaust device 100 of the present embodiment, compared to the case where the central axis of the exhaust pipe is joined in a state in which the central axis of the exhaust case is not largely inclined with respect to the central axis of the catalyst case, the space is smaller. Arrangement is possible.

  (1b) The edge 51 is formed with an inclined portion 51A and a vertical portion 51B that is a portion having a shape along a plane perpendicular to the central axis Z. The lid plate portion 33 includes an inclined lid portion 33A that covers a portion of the opening 5H on the inclined portion 51A side, and a vertical lid portion 33B that covers a portion of the opening 5H on the vertical portion 51B side. The exhaust cylinder part 31 is formed in the inclined lid part 33A. According to such a configuration, the presence of the vertical portion 51B makes it possible to reduce the portion occupied by the inclined portion 51A in the end edge 51, in other words, the portion occupied by the inclined lid portion 33A. Therefore, the length of the catalyst case 5 in the direction of the central axis Z can be shortened as compared with the case where the end edge 51 is entirely occupied by the inclined portion 51A. Thereby, the exhaust device can be arranged in a smaller space.

  (1c) The exhaust cylinder portion 31 is formed by burring in the inclined lid portion 33A. Therefore, in the manufacturing process of the connecting member 3, it is possible to make it difficult for the processing mold for burring to interfere with the connecting member 3 itself. That is, as a comparison target, a configuration is assumed in which the entire end portion of the catalyst case on the side to be joined to the connecting member has a shape along a plane perpendicular to the central axis of the end portion. In such a configuration of the comparative example, if an exhaust tube portion whose central axis is greatly inclined with respect to a straight line parallel to the central axis of the end portion of the catalyst case is to be formed on the connecting member by burring processing, processing for burring processing is performed. The mold tends to interfere with the case tube portion of the connecting member. For this reason, the inclination of the exhaust tube portion is limited to a range in which the processing mold for burring and the connecting member do not interfere with each other.

  On the other hand, in the exhaust device 100 of the present embodiment, the inclined portion 51A is formed on the end edge 51 of the catalyst case 5 on the side joined to the case cylinder portion 32. The connecting member 3 has an inclined lid portion 33A that covers a portion of the opening 5H on the inclined portion 51A side, and the exhaust cylinder portion 31 is formed on the inclined lid portion 33A. In such a configuration, even if the central axis Y1 of the exhaust tube portion 31 is greatly inclined with respect to a straight line parallel to the central axis Z of the end portion of the catalyst case 5, the inclined surface along the direction of the inclined portion 51A The inclination of the central axis Y1 of the exhaust cylinder part 31 with respect to the orthogonal straight line is kept small. And the length of the connection member 3 in the central axis Z direction can be shortened because the length of the catalyst case 5 in the central axis Z direction becomes longer compared with the catalyst case of the comparative example. For this reason, when the exhaust cylinder portion 31 of the central axis Y1 is formed on the inclined lid portion 33A of the connecting member 3 by burring, the burring processing mold does not easily interfere with the case cylindrical portion 32 of the connecting member 3. . Therefore, it can be configured such that the central axis X in the exhaust pipe 2 is connected in a state of being largely inclined with respect to a straight line parallel to the central axis Z in the catalyst case 5.

  FIG. 2 is a schematic view of the configuration of the comparative example described above cut along a plane including the central axis of the exhaust cylinder and the central axis of the case cylinder. In the configuration of the comparative example, the minimum value of the inclination θ of the central axis of the exhaust cylinder relative to the plane perpendicular to the central axis of the case cylinder can be expressed by the following equation (1). In Equation (1), A is the inner diameter of the exhaust cylinder part, and B is the inner diameter of the case cylinder part. C is the minimum value of the distance between the end surface of the case tube portion and the outer peripheral surface of the exhaust tube portion. Here, the end surface of the case tube portion is a surface that includes an interference point P that is a point at which a processing die for burring interferes and is perpendicular to the central axis of the case tube portion.

Bsin θ−C cos θ = A (1)
That is, in the configuration of the comparative example, the minimum value of θ is determined by the three parameters A to C. As can be seen from FIG. 2, the smaller the value of C, the smaller the value of θ. That is, the minimum value of θ that can be realized with the configuration of the comparative example can be expressed by the following equation (2) obtained by substituting 0 into C of the equation (1).

Bsin θ = A (2)
In the exhaust device 100 of the present embodiment, for the reasons described above, even if the values of A and B are the same as the configuration of the comparative example, an angle smaller than θ calculated by Expression (2) can be realized. .

  In the above embodiment, the exhaust pipe 2 corresponds to an example of a first tubular member, and the catalyst case 5 corresponds to an example of a second tubular member. Further, the exhaust cylinder part 31 corresponds to an example of a first joint part, the case cylinder part 32 corresponds to an example of a second joint part, the center axis X corresponds to an example of a first center axis, and the center The axis Z corresponds to an example of a second central axis.

[3. Other Embodiments]
As mentioned above, although embodiment of this indication was described, it cannot be overemphasized that this indication can take various forms, without being limited to the above-mentioned embodiment.

  (2a) In the exhaust device 100 in the above embodiment, the exhaust pipe 2, the connecting member 3, and the catalyst case 5 are joined in order from the upstream, and the central axis X of the downstream end of the exhaust pipe 2 and the central axis of the catalyst case 5 A configuration in which Z is greatly inclined is illustrated. However, the configuration of the exhaust device is not limited to this. For example, the exhaust device may be configured such that the catalyst case, the connecting member, and the exhaust pipe are joined in order from the upstream, and the central axis of the catalyst case and the upstream end of the exhaust pipe are greatly inclined. Further, the connecting member and the exhaust pipe may be joined to both the upstream and downstream sides of the catalyst case as described above, and the central axis of the catalyst case and the central axis of each exhaust pipe may be greatly inclined.

  (2b) In the above embodiment, the connecting member 3 has the inclined lid portion 33A and the vertical lid portion 33B, and the catalyst case 5 has the configuration having the inclined portion 51A and the vertical portion 51B. However, the structure of the connection member 3 and the catalyst case 5 is not limited to this. For example, the connecting member and the catalyst case do not have a vertical lid portion and a vertical portion, that is, the entire edge of the connecting member in the case tube portion and the entire edge of the catalyst case are perpendicular to the central axis of the catalyst case. It is good also as a structure inclined with respect to the surface.

  (2c) In the above embodiment, the configuration in which the inclination of the central axis Y1 of the exhaust cylinder portion 31 with respect to a straight line orthogonal to the inclined surface along the direction of the inclined portion 51A is substantially zero. However, the configuration of the connecting member and the catalyst case is not limited to this. For example, the center axis | shaft of the exhaust cylinder part of a connection member may be the structure inclined with respect to the straight line orthogonal to the inclined surface along the direction of the inclination part of a catalyst case.

  (2d) In the above embodiment, the configuration in which the exhaust tube portion 31 is formed by burring is illustrated, but burring is an example, and the processing method of the exhaust tube portion 31 is not limited to this. For example, the exhaust cylinder part 31 may be formed by press work.

  (2e) In the above embodiment, a configuration in which the catalyst case 5 including the inclined portion 51A and the vertical portion 51B is formed by rounding a plate material in which a portion corresponding to the inclined portion 51A has been cut in advance is illustrated. The method of forming the case is not limited to this. For example, you may shape | mold the catalyst case containing an inclination part by cutting diagonally a part of edge part of metal cylinders.

  (2f) In the above-described embodiment, the exhaust pipe 2 and the catalyst case 5 each have a configuration in which the shape of the cross section perpendicular to the central axis is a perfect circle. However, the shapes of the exhaust pipe and the catalyst case are limited to this. Is not to be done. For example, the exhaust pipe and the catalyst case may have an elliptical or polygonal cross-sectional shape perpendicular to the central axis.

  (2g) In the above embodiment, the configuration in which the flange 1, the exhaust pipe 2, the connecting member 3, and the catalyst case 5 are joined to each other by welding is exemplified, but the joining method is not limited to this. For example, the exhaust pipe 2, the connecting member 3, and the catalyst case 5 may be joined to each other by brazing.

  (2h) In the above embodiment, the exhaust pipe 2 and the connecting member 3 are illustrated as being joined to each other with the downstream end portion of the exhaust pipe 2 inserted into the exhaust cylinder portion 31. However, the structure of joining the connecting member and the connecting member is not limited to this. For example, the exhaust pipe and the connecting member may be joined in a state in which the exhaust pipe is in contact with the exhaust pipe so as to cover the outside.

  (2i) In the above embodiment, the catalyst case 5 that is a tubular member that houses the catalyst 4 is illustrated as the second tubular member, but the function of the catalyst case is not limited thereto. For example, the catalyst case may be a member that accommodates a DPF (Diesel Particulate Filter) or a GPF (Gasoline Particulate Filter).

  (2j) In the exhaust device 100 in the above embodiment, the configuration in which the central axis X of the downstream end portion of the exhaust pipe 2 and the central axis Z of the catalyst case 5 are greatly inclined is exemplified. It is not limited. The configuration of the above-described embodiment, that is, the configuration in which the central axes of two tubular members having different inner diameters are inclined to each other, may be applied to locations other than the catalyst case, such as a muffler and its surrounding exhaust pipe. Further, the second tubular member may be a tubular member that forms a muffler shell.

  (2k) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1 ... Flange, 1H ... Through-hole, 2 ... Exhaust pipe, 3 ... Connecting member, 4 ... Catalyst, 5 ... Catalyst case, 5H ... Opening, 31 ... Exhaust cylinder part, 32 ... Case cylinder part, 33 ... Cover plate part, 33A ... Inclined lid part, 33B ... Vertical lid part, 51 ... End edge, 51A ... Inclined part, 51B ... Vertical part, 100 ... Exhaust device, X, Y1, Y2, Z ... Central axis.

Claims (3)

An exhaust device for forming an exhaust passage,
A first tubular member;
A second tubular member having an inner diameter larger than that of the first tubular member;
A connecting member that connects the first tubular member and the second tubular member;
With
The connecting member is
A first joint that is a part joined to an end of the first tubular member;
A second joint that is a part joined to an end of the second tubular member;
A lid plate portion covering an opening on the side joined to the second joint portion in the second tubular member;
Have
A first central axis that is a central axis of an end of the first tubular member that is joined to the first joint is joined to the second joint of the second tubular member. Tilted with respect to a straight line parallel to the second central axis, which is the central axis of the side end,
The edge of the second tubular member on the side to be joined with the second joint is an inclined portion that is a portion of a shape along a plane inclined with respect to a plane perpendicular to the second central axis. An exhaust device is formed. The exhaust device according to claim 1,
At the edge of the second tubular member on the side to be joined to the second joint, the inclined portion and a vertical portion that is a portion along a plane perpendicular to the second central axis, Formed,
The lid plate portion has an inclined lid portion that covers a portion of the opening on the inclined portion side, and a vertical lid portion that covers a portion of the opening on the vertical portion side,
The exhaust device according to claim 1, wherein the first joint portion is formed on the inclined lid portion. The exhaust device according to claim 1 or 2,
The exhaust device, wherein the first joint is formed in a cylindrical shape by burring.

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