Exhaust system component

Abstract

To provide a technique for suppressing positional displacement of a sensor boss relative to a flow passage member.SOLUTION: An exhaust system component comprises a flow passage member having a recess and an insertion hole and forming a flow passage, and a sensor boss attached to the recess. The recess is a portion of the flow passage member that is recessed toward the interior of the flow passage, with a seating surface and an outer wall surface. The seating surface faces outward from the flow passage member and is located, in a thickness direction of the flow passage member, between outer and inner surfaces of a portion adjacent to the recess of the flow passage member. The outer wall surface connects the seating surface to the outer surface. The insertion hole is formed in the recess so as to pass through the recess. The sensor boss has a communication passage configured to communicate with the insertion hole, a contact surface surrounding one opening of the communication passage, and a side surface extending from an edge of the contact surface. The sensor boss is joined to the flow passage member by welding, in a state where the contact surface is in contact with the seating surface and at least a portion of the side surface is in contact with the outer wall surface.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to an exhaust system component including a flow path member to which a sensor boss is joined. [Background technology]

[0002] Patent Document 1 discloses an exhaust pipe with a double pipe structure installed in the exhaust system of a vehicle's internal combustion engine. In this exhaust pipe, a sensor boss for holding a sensor inserted into the exhaust pipe is joined to a flat portion provided on the outer surface of the outer pipe. The outer peripheral portion of the end of the sensor boss that abuts against the flat portion is fixed to the flat portion by welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-246863 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when welding the sensor boss, even if the sensor boss is positioned so as to abut against a predetermined position on the flat portion, the sensor boss may be displaced from that position during welding.

[0005] An object of one aspect of the present disclosure is to provide a technique for suppressing misalignment of a sensor boss with respect to a flow path member. [Means for solving the problem]

[0006] One aspect of the present disclosure is an exhaust system component comprising a flow path member and a sensor boss. The flow path member forms a flow path through which exhaust gas flows. The flow path member also has a recessed portion and an insertion hole. The recessed portion is a portion of the flow path member that is recessed toward the flow path. The insertion hole is formed in the recessed portion so as to penetrate the recessed portion. The sensor boss is attached to the recessed portion. The sensor boss also has a communication passage, an abutment surface, and a side surface. The communication passage is configured to communicate with the insertion hole. The abutment surface surrounds one opening of the communication passage. The side surface extends from the edge of the abutment surface. The recessed portion has a seating surface and an outer wall surface. The seating surface faces the outside of the flow path member and is located between the outer surface and inner surface of a portion of the flow path member adjacent to the recessed portion in the thickness direction of the flow path member. The outer wall surface connects the seating surface and the outer surface. The sensor boss is joined by welding to the flow path member in a state in which the abutment surface abuts against the seat surface and at least a portion of the side surface abuts against the outer wall surface.

[0007] In this configuration, the sensor boss disposed in the recess can be joined to the flow path member with the abutment surface of the sensor boss abutting against the seating surface of the recess and with at least a portion of the side surface of the sensor boss abutting against the outer wall surface of the recess. Therefore, when the sensor boss is welded to the flow path member, the seating surface and the outer wall surface tend to restrict movement of the sensor boss. This makes it possible to prevent the sensor boss from shifting relative to the flow path member.

[0008] In one aspect of the present disclosure, the recessed portion may have an opposing surface and an inner wall surface. The opposing surface faces the seat surface. The opposing surface is located more inward of the flow path in the thickness direction than the inner surface of the flow path member adjacent to the recessed portion. The inner wall surface connects the opposing surface and the inner surface. The inner wall surface may be provided such that the outer wall surface is located closer to the insertion hole than the inner wall surface in a direction perpendicular to the thickness direction.

[0009] With this configuration, the distance between the inner wall surface and the outer wall surface of the recessed portion tends to increase in the direction perpendicular to the thickness direction, which can prevent the recessed portion from locally thinning the thickness of the flow path member, thereby preventing a decrease in the strength of the flow path member around the recessed portion.

[0010] In one aspect of the present disclosure, a central axis extending from the contact surface of the sensor boss to the non-contact surface opposite the contact surface may be inclined with respect to the seat surface. If the central axis of the sensor boss is inclined relative to the seating surface, pressing the sensor boss against the flow path member during welding of the sensor boss is likely to generate a force in a direction along the seating surface, and this force will relatively easily cause the position of the sensor boss to shift relative to the flow path member. According to the above-mentioned configuration, the side surface of the sensor boss abuts against the outer wall surface of the recess, restricting movement of the sensor boss in a direction along the seating surface, thereby further suppressing positional shift of the sensor boss relative to the flow path member. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a perspective view schematically showing a part of an exhaust system component. [Figure 2] FIG. 2 is an exploded perspective view schematically showing a part of an exhaust system component. [Figure 3] FIG. 3 is a side view schematically showing a part of the flow path member. [Figure 4] FIG. 2 is a plan view schematically showing a part of the flow path member. [Figure 5] FIG. 5 is a diagram schematically showing a VV cross section of FIG. 4. [Figure 6] FIG. 10 is a schematic cross-sectional view illustrating a contact step. [Figure 7] FIG. 2 is a schematic cross-sectional view illustrating a welding step. [Figure 8] Fig. 8A is a diagram showing a state in which the blank is clamped, Fig. 8B is a diagram showing a state in which a recessed portion is formed in the blank, and Fig. 8C is a diagram showing a state in which an insertion hole is formed in the recessed portion. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Exhaust system component configuration] 1 is a component that constitutes at least a part of an exhaust system that constitutes an exhaust gas flow path of an internal combustion engine. Examples of the exhaust system component 100 include an exhaust manifold, an exhaust pipe, a catalytic converter, and a muffler.

[0013] As shown in Figures 1 and 2, the exhaust system part 100 includes a flow path member 1 and a sensor boss 2. The flow path member 1 and the sensor boss 2 are joined by welding. Figures 1 and 2 show the joining structure of the flow path member 1 and the sensor boss 2 in the exhaust system part 100. Note that in the drawings, only a portion of the flow path member 1 is shown schematically.

[0014] <Flow path components> The flow path member 1 forms a flow path through which exhaust gas flows. The flow path member 1 is made of metal and is configured from a plate-shaped member (specifically, a blank material 10 described below). For example, a cylindrical flow path member 1 is formed by rolling up a plate-shaped metal member. The flow path member 1 has an outer surface 11, an inner surface 12, a recessed portion 13, and an insertion hole 14. In Figures 1 and 2, the upper surface of the flow path member 1 corresponds to the outer surface 11 of the flow path member 1, and the lower surface of the flow path member 1 corresponds to the inner surface 12 of the flow path member 1. The inner surface 12 is the surface that comes into contact with the exhaust gas.

[0015] The recessed portion 13 is a portion of the flow path member 1 that is recessed toward the inside of the flow path. As will be described in detail later, as shown in Figures 2 and 3, the recessed portion 13 is formed in the flow path member 1 so that a part of the outer surface 11 of the flow path member 1 is recessed toward the inside of the flow path and a part of the inner surface 12 of the flow path member 1 protrudes toward the inside of the flow path. The sensor boss 2 is attached to the recessed portion 13.

[0016] 4, in this embodiment, the recess 13 has a substantially oval shape in plan view. Note that the shape of the recess in plan view may be substantially circular, elliptical, polygonal, or the like, or may have a shape similar to the contact surface 22 of the sensor boss 2. 5, in this embodiment, the recessed portion 13 has a seating surface 131, an outer wall surface 132, an opposing surface 133, and an inner wall surface 134. The seating surface 131 and the outer wall surface 132 constitute a recess formed in the outer surface 11 of the flow path member 1. The opposing surface 133 and the inner wall surface 134 constitute a protrusion formed in the inner surface 12 of the flow path member.

[0017] The seating surface 131 faces the outside of the flow path member 1 and extends in a substantially flat shape. The seating surface 131 is located, in the thickness direction of the flow path member 1 (the vertical direction in FIG. 5), between the outer surface 11 of the flow path member 1 adjacent to the recessed portion 13 (hereinafter simply referred to as the outer surface 11) and the inner surface 12 of the flow path member 1 adjacent to the recessed portion 13 (hereinafter simply referred to as the inner surface 12).

[0018] The outer wall surface 132 connects the seat surface 131 and the outer surface 11 and is provided so as to go around the edge of the seat surface 131. In this embodiment, the outer wall surface 132 extends substantially perpendicular to the seat surface 131. The opposing surface 133 faces the seating surface 131 and faces the flow path of the flow path member 1, and extends in a substantially planar shape substantially parallel to the seating surface 131. The opposing surface 133 is located more inward of the flow path than the inner surface 12 in the thickness direction.

[0019] The inner wall surface 134 connects the opposing surface 133 and the inner surface 12, and is provided so as to go around the edge of the opposing surface 133. The inner wall surface 134 is provided so that the outer wall surface 132 is located closer to the insertion hole 14 than the inner wall surface 134 in an orthogonal direction (left-right direction in FIG. 5 ) perpendicular to the thickness direction. In other words, when the inner wall surface 134 and the outer wall surface 132 are projected onto an imaginary plane perpendicular to the thickness direction, the inner wall surface 134 is located outside the outer wall surface 132 and is provided so as to go around the outer wall surface 132. In this embodiment, the inner wall surface 134 extends from the opposing surface 133 to the inner surface 12 so as to have a gentle slope.

[0020] Although details will be described later, in this embodiment, the recessed portion 13 is formed by shearing to have a thickness as described below. Specifically, the recessed portion 13 is formed so that the thickness t1 between the seating surface 131 and the opposing surface 133 is thinner than the thickness t2 between the outer surface 11 and the inner surface 12, and the thickness t3 between the outer wall surface 132 and the inner wall surface 134 is substantially the same as or slightly thinner than the thickness t2. In other words, the recess formed by the seating surface 131 and the outer wall surface 132 on the outer surface 11 of the recessed portion 13 has a depth that fits within the thickness t2 (i.e., the thickness of the blank 10, which will be described later). Note that the thinner the thickness t1 is formed by shearing, the thicker the thickness t3 can be formed.

[0021] As shown in FIGS. 2 and 4, the insertion hole 14 is a through-hole formed in the recess 13 so as to penetrate the recess 13. Specifically, the insertion hole 14 penetrates the seat surface 131 and the opposing surface 133. The insertion hole 14 is a through-hole for inserting a sensor (not shown) into the flow path from the outside of the flow path member 1. Specifically, the tip of the sensor is inserted into the flow path through the insertion hole 14. In this embodiment, the insertion hole 14 is substantially circular. However, the shape of the insertion hole may be substantially elliptical, substantially polygonal, or the like.

[0022] <Sensor boss> 1 and 2, the sensor boss 2 is attached to the recess 13 of the flow path member 1 and is configured to hold a sensor inserted into the insertion hole 14 of the flow path member 1. The sensor boss 2 is made of metal and is cylindrical. As shown in FIGS. 6 and 7, the sensor boss 2 has a communication passage 21, a contact surface 22, a non-contact surface 23, and a side surface 24.

[0023] The sensor boss 2 also has a central axis A that extends in a substantially straight line from the center of the contact surface 22 to the center of the non-contact surface 23. In this embodiment, the central axis A is inclined with respect to the seating surface 131 of the recessed portion 13 in the flow path member 1. Therefore, the sensor boss 2 is attached to the recessed portion 13 of the flow path member 1 in a state inclined with respect to the seating surface 131. Note that the state in which the central axis A is inclined with respect to the seating surface 131 can also be said to mean that the central axis A is at an angle with respect to a line that extends substantially perpendicular to the seating surface 131.

[0024] The communicating passage 21 is a through-hole formed in the sensor boss 2, and passes through the abutment surface 22 and the non-abutment surface 23. The tip of the sensor can be inserted into the communicating passage 21. In this embodiment, the communicating passage 21 extends along the central axis A. The central axis of the communicating passage 21 coincides with the central axis A of the sensor boss 2. However, the central axis of the communicating passage does not have to coincide with the central axis A of the sensor boss 2. The communicating passage 21 is configured to communicate with the insertion hole 14 of the flow path member 1.

[0025] The abutment surface 22 surrounds one opening of the communicating passage 21 and abuts against the seating surface 131 of the recessed portion 13. The abutment surface 22 is generally planar and intersects with the central axis A at an angle. In this embodiment, the abutment surface 22 has the same shape as the seating surface 131 of the recessed portion 13 in the flow path member 1, i.e., a generally oval shape, and is formed to be approximately the same size as the seating surface 131. The abutment surface may be formed slightly smaller than the seating surface 131. The shape of the abutment surface may also be generally circular, elliptical, polygonal, or the like.

[0026] The non-contact surface 23 surrounds the opening of the communicating passage 21 on the opposite side to the contact surface 22, and is a surface that is pressed during welding. The non-contact surface 23 is substantially planar and intersects the central axis A substantially perpendicularly. In this embodiment, the non-contact surface 23 is substantially circular. The shape of the non-contact surface may be substantially oval, elliptical, polygonal, or the like.

[0027] When the sensor boss 2 is placed in the recess 13 , the contact surface 22 is disposed approximately parallel to the seating surface 131 , and the non-contact surface 23 is disposed intersecting the contact surface 22 and the seating surface 131 . The side surface 24 extends from the edge of the contact surface 22 and extends to the edge of the non-contact surface 23. That is, in this embodiment, all surfaces other than the contact surface 22 and the non-contact surface 23 are referred to as the side surface 24.

[0028] The sensor boss 2 is formed so that the area of ​​a cross section parallel to the abutment surface 22 and intersecting with the central axis A near the end on the abutment surface 22 side is larger than the area of ​​a cross section perpendicular to the central axis A near the end on the non-abutment surface 23 side. In other words, the abutment surface 22 has a larger area than the non-abutment surface 23. A straight line portion 241 extending approximately perpendicularly from the edge of the abutment surface 22 to the abutment surface 22 is provided near the end on the abutment surface 22 side of the sensor boss 2. The straight line portion 241 is part of the side surface 24.

[0029] [2. Manufacturing method for exhaust system parts] Next, a method for manufacturing the exhaust system component 100 will be described. Specifically, a method for forming the recessed portion 13 in the flow path member 1 and a method for joining the sensor boss 2, which are included in the method for manufacturing the exhaust system component 100, will be described. The method for manufacturing the exhaust system component 100 includes a recessed portion forming step shown in Figures 8A to 8C, a contacting step shown in Figure 6, and a welding step shown in Figure 7. In the method for forming the recessed portion 13 in the flow path member 1 of this embodiment, the recessed portion 13 is formed by shearing using an apparatus including an upper mold 5, a first lower mold 6, a first punch 7, a second lower mold 8, and a second punch 9.

[0030] <Recess formation device> 8A and 8B, the upper die 5 and the first lower die 6 are arranged to face each other. Specifically, the upper die 5 is arranged above the blank 10 so as to abut against the upper surface 10a. The first lower die 6 is arranged below the blank 10 so as to abut against the lower surface 10b. The blank 10 is a plate material that constitutes the above-mentioned flow path member 1. The upper surface 10a of the blank 10 corresponds to the outer surface 11 of the flow path member 1, and the lower surface 10b of the blank 10 corresponds to the inner surface 12 of the flow path member 1.

[0031] The upper die 5 has a first through-hole 51 formed in the center thereof, through which the first punch 7 is inserted. A recess 61 is formed on the top surface of the first lower mold 6 at a position opposite to the first through-hole 51 of the upper mold 5 .

[0032] The first punch 7 passes through the first through-hole 51 and shears the blank 10. Specifically, the blank 10 is crushed while being sheared by the first punch 7, and the recessed portion 13 described above is formed.

[0033] 8C, the second lower die 8 is disposed below the blank 10 in which the recessed portion 13 is formed so as to abut against the lower surface 10b. The second lower die 8 has a shape generally similar to that of the first lower die 6. The second lower die 8 has a second through-hole 81 formed in the center of the recessed portion 61, through which the second punch 9 is inserted.

[0034] The second punch 9 has a smaller cross-sectional area perpendicular to the central axis of each through hole 51, 81 than the first punch 7. The second punch 9 comes into contact with the recessed portion 13 from the top surface 10a side of the blank 10, and then shears the recessed portion 13 of the blank 10 so as to pass through the second through hole 81. Specifically, the second punch 9 shears the recessed portion 13, forming the above-mentioned insertion hole 14.

[0035] <Recess formation process> 8A, the blank material 10, which is spread out in a substantially flat shape, is sandwiched between the upper mold 5 and the first lower mold 6. Specifically, the blank material 10 is placed above the first lower mold 6 so that the lower surface 10b is in contact with it, and the upper mold 5 is placed above the blank material 10 so that the recessed portion 61 and the first through-hole 51 overlap and the upper surface 10a is in contact with it.

[0036] Next, as shown in Fig. 8B, a first punch 7 is passed through the first through-hole 51 of the upper die 5, and the blank 10 is crushed downward while being sheared by the first punch 7. As a result, the upper surface 10a of the blank 10 (i.e., the outer surface 11 of the flow path member 1) is sheared, and a seat surface 131 and an outer wall surface 132 are formed on the upper surface 10a. Furthermore, the lower surface 10b of the blank 10 (i.e., the inner surface 12 of the flow path member 1) is pressed into the recessed portion 61, and an opposing surface 133 and an inner wall surface 134 are formed on the lower surface 10b. In other words, the recessed portion 13 is formed in the blank 10 by the shearing process of the blank 10 by the first punch 7.

[0037] Next, as shown in FIG. 8C, the blank 10 with the recessed portion 13 formed therein is placed above the second lower mold 8 so that the recessed portion 13 fits into the recessed portion 61 of the second lower mold 8.

[0038] Then, the recessed portion 13 of the blank 10 is sheared by the second punch 9, and the second punch 9 is passed through the second through-hole 81 of the second lower die 8, thereby forming an insertion hole 14 in the recessed portion 13. In other words, the shearing process of the recessed portion 13 by the second punch 9 forms the insertion hole 14 in the recessed portion 13.

[0039] <Abutting process> As shown in Figure 6, in the abutment process, the sensor boss 2 is placed in the recess 13, the abutment surface 22 of the sensor boss 2 is abutted against the seat surface 131 of the recess 13, and the side surface 24 of the sensor boss 2 is abutted against the outer wall surface 132 of the recess 13.

[0040] Specifically, the end of the sensor boss 2 on the abutment surface 22 side is fitted into the recess 13 (specifically, the recess formed by the seat surface 131 and the outer wall surface 132) so that the communication passage 21 of the sensor boss 2 communicates with the insertion hole 14 of the recess 13. At this time, in this embodiment, the abutment surface 22 contacts the seat surface 131, and the linear portion 241 of the side surface 24 contacts the outer wall surface 132 of the recess 13 over substantially the entire circumference.

[0041] <Welding process> 7, in the welding process, a pressing member 200 is arranged so as to cover the non-contact surface 23 of the sensor boss 2 in a state in which the contact surface 22 is in contact with the seat surface 131 of the recess 13. The pressing member 200 is a member for pressing the sensor boss 2 toward the flow path member 1. The pressing member 200 is, for example, a block-shaped jig or a clamp.

[0042] Then, in a state where the sensor boss 2 is pressed toward the flow path member 1 along the central axis A by the pressing member 200, the side surface 24 (specifically, the straight portion 241) is welded to the outer surface 11 of the flow path member 1, thereby joining the sensor boss 2 to the flow path member 1. In this way, the exhaust system component 100 is obtained.

[0043] [3.Effects] According to the embodiment described above in detail, the following effects can be obtained. (3a) In this embodiment, the sensor boss 2 disposed in the recess 13 can be joined to the flow path member 1 with the abutment surface 22 of the sensor boss 2 abutting against the seat surface 131 of the recess 13 and the straight portion 241 of the sensor boss 2 abutting against the outer wall surface 132 of the recess 13. That is, the sensor boss 2 can be joined to the flow path member 1 with the end of the sensor boss 2 on the abutment surface 22 side fitted into the recess 13. Therefore, when the sensor boss 2 is welded to the flow path member 1, the seat surface 131 and the outer wall surface 132 tend to restrict movement of the sensor boss 2. This can prevent the sensor boss 2 from shifting relative to the flow path member 1. As a result, the sensor boss 2 can be easily welded at a predetermined position, improving the welding quality of the exhaust system component 100. Furthermore, improved welding quality can prevent gas leakage from cracks in the welded portion, which is prone to occur due to poor welding quality.

[0044] (3b) In this embodiment, the inner wall surface 134 is provided such that the outer wall surface 132 is located closer to the insertion hole 14 than the inner wall surface 134 in the orthogonal direction. This makes it easier to increase the distance between the inner wall surface 134 and the outer wall surface 132 of the recessed portion 13 in the orthogonal direction, compared to, for example, a configuration in which an inner wall surface extending substantially perpendicular to the seating surface is located directly below the outer wall surface. Therefore, it is possible to prevent the formation of a locally thin portion in the flow path member 1 due to the provision of the recessed portion 13. As a result, it is possible to prevent a decrease in the strength of the flow path member 1 around the recessed portion 13.

[0045] (3c) In the case where the central axis A of the sensor boss 2 is inclined with respect to the seating surface 131 as in this embodiment, when the sensor boss 2 is pressed against the flow path member 1 during welding of the sensor boss 2, a force is likely to be generated in a direction along the seating surface 131. Specifically, the load F shown in FIG. 7 along the central axis A that is applied to the sensor boss 2 is decomposed into a component force Fa along the seating surface 131 and a component force Fb perpendicular to the seating surface 131. Of the load F, the component force Fa acts in a direction that moves the sensor boss 2 along the seating surface 131. The component force Fa makes it relatively easy for the position of the sensor boss 2 to shift relative to the flow path member 1.

[0046] However, in this embodiment, the linear portion 241 of the sensor boss 2 abuts against the outer wall surface 132 of the recessed portion 13, thereby restricting movement of the sensor boss 2 in the direction along the seating surface 131. In other words, the sensor boss 2 is less likely to move in the direction along the seating surface 131 of the flow path member 1. This makes it possible to further suppress positional deviation of the sensor boss 2 relative to the flow path member 1.

[0047] (3d) In this embodiment, the recess 13 is formed by shearing. This makes it easy to form the outer wall surface 132 of the recess 13 substantially perpendicular to the seating surface 131. As a result, compared to a configuration in which the outer wall surface extends at an angle outward from the insertion hole relative to the seating surface, for example, the area over which the linear portion 241 of the sensor boss 2 abuts against the outer wall surface increases, making it even easier to restrict movement of the sensor boss 2 in the direction along the seating surface 131.

[0048] (3e) In this embodiment, the linear portion 241 of the sensor boss 2 is welded to the outer surface 11 of the flow path member 1, thereby joining the sensor boss 2 to the flow path member 1. This makes it easier to ensure an installation area for welding. As a result, the welding quality of the exhaust system component 100 can be improved.

[0049] (3f) In this embodiment, the sensor boss 2 is joined to the recessed portion 13 with the contact surface 22 in contact with the seat surface 131 facing the outside of the flow path member 1 (i.e., not facing the inside of the flow path), and all parts of the sensor boss 2 are disposed outside the flow path member 1. This prevents the high-temperature exhaust gas flowing through the flow path member 1 from directly contacting the sensor boss 2. As a result, it is possible to prevent thermal damage to the sensor boss 2 and the resulting leakage of exhaust gas.

[0050] 4. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0051] (4a) In the above embodiment, when the end of the sensor boss 2 on the contact surface 22 side is fitted into the recessed portion 13, the linear portion 241 of the sensor boss 2 is in contact with the outer wall surface 132 of the recessed portion 13 over substantially the entire circumference. However, for example, when the end of the sensor boss 2 on the contact surface 22 side is fitted into the recessed portion 13, only at least a portion of the linear portion 241 in the circumferential direction may be in contact with the outer wall surface 132. In other words, when the end of the sensor boss 2 on the contact surface 22 side is fitted into the recessed portion 13, a partial gap may be formed between the outer wall surface 132 and the linear portion 241. Specifically, for example, it is preferable that at least the innermost portion of the linear portion 241 in the acting direction of the component force Fa along the seating surface 131 be in contact with the outer wall surface 132. This further restricts movement of the sensor boss 2 in the direction along the seating surface 131.

[0052] (4b) In the above embodiment, the inner wall surface 134 is provided so that the outer wall surface 132 is located closer to the insertion hole 14 in the perpendicular direction than the inner wall surface 134. However, for example, the inner wall surface may be provided at a position that overlaps with the outer wall surface 132 in the perpendicular direction.

[0053] (4c) In the above embodiment, the central axis A of the sensor boss 2 is inclined with respect to the seating surface 131. However, for example, the central axis of the sensor boss may be approximately perpendicular to the seating surface 131. (4d) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0054] 1...flow path member, 2...sensor boss, 5...upper die, 6...first lower die, 7...first punch, 8...second lower die, 9...second punch, 10...blank material, 10a...upper surface, 10b...lower surface, 11...outer surface, 12...inner surface, 13...recessed portion, 14...insertion hole, 21...communicating passage, 22...contact surface, 23...non-contact surface, 24...side surface, 51...first through hole, 61...recessed portion, 81...second through hole, 100...exhaust system part, 131...seat surface, 132...outer wall surface, 133...opposing surface, 134...inner wall surface, 200...pressure member, 241...straight portion, A...central axis.

Claims

1. An exhaust system component, a flow path member that forms a flow path through which exhaust gas flows, the flow path member having a recessed portion in which a part of the flow path member is recessed toward the inside of the flow path, and an insertion hole formed in the recessed portion so as to penetrate the recessed portion; a sensor boss attached to the recess; Equipped with the sensor boss has a communication passage configured to communicate with the insertion hole, an abutment surface surrounding one opening of the communication passage, and a side surface extending from an edge of the abutment surface, the recessed portion has a seating surface facing the outside of the flow path member and positioned between an outer surface and an inner surface of a portion of the flow path member adjacent to the recessed portion in a thickness direction of the flow path member, and an outer wall surface connecting the seating surface and the outer surface, The sensor boss is joined to the flow path member by welding in a state in which the abutment surface abuts against the seat surface and at least a portion of the side surface abuts against the outer wall surface.

2. 2. The exhaust system component according to claim 1, the recessed portion has an opposing surface facing the seat surface, the opposing surface being located more inward of the flow path than the inner surface in the thickness direction, and an inner wall surface connecting the opposing surface and the inner surface, The inner wall surface is provided such that the outer wall surface is positioned closer to the insertion hole than the inner wall surface in a direction perpendicular to the thickness direction.

3. The exhaust system component according to claim 1 or 2, an exhaust system component, wherein a central axis of the sensor boss extending from the contact surface to a non-contact surface opposite the contact surface is inclined with respect to the seat surface;

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