Exhaust component connection structure

Abstract

Suppresses noise from exhaust components. [Solution] The connection structure of the vehicle's exhaust component comprises a first and a second component, and a first joint that is joined to the second component. The first component is tubular. The second component has an exhaust flow path formed inside and an inlet into which the first component is inserted. The first joint is a flange-shaped portion located away from the outlet. The insertion portion, which is the part of the first component closer to the outlet than the first joint, has at least one hole. The insertion portion is inserted into the interior of the second component from the inlet. A gap is formed between the insertion portion and the covering portion, which is the part of the second component facing the insertion portion.

Description

Technical Field

[0001] The present disclosure relates to a connection structure for an exhaust component that allows exhaust gas of a vehicle to flow therethrough.

Background Art

[0002] As disclosed in Patent Document 1, a technique for connecting a first pipe and a second pipe by a clamp is known. In the first pipe of Patent Document 1, a folded flange portion formed by deforming the first pipe is formed in the vicinity of an opening, and a portion of the first pipe closer to the opening than the folded flange portion is inserted into the opening of the second pipe. Further, a bulging portion formed by expanding the diameter of the edge portion is provided at the edge portion surrounding the opening of the second pipe, and the first pipe is arranged such that the folded flange portion and the bulging portion are in contact with each other. A ring-shaped gasket is arranged between the inner side of the bulging portion and the outer peripheral surface of the first pipe, and the first pipe and the second pipe are fastened by a clamp arranged to cover the folded flange portion and the bulging portion from the outside.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technique disclosed in Patent Document 1, the portion of the first pipe closer to the opening than the folded flange portion and the portion of the second pipe near the opening are arranged to overlap with each other. If a gap is formed between these portions, the flow of exhaust gas may be disturbed, which may cause abnormal noise.

[0005] In one aspect of the present disclosure, it is desirable to suppress noise of the exhaust component.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a connection structure for an exhaust component mounted on a vehicle, comprising a first component, a second component, a first joint, and at least one hole. The first component is a tubular member in which an exhaust passage from the vehicle's engine is formed inside. The second component is a member in which an exhaust passage is formed inside, and has an inlet into which the exhaust outlet side portion of the first component is inserted. The first joint is a flange-like portion provided on the outer circumferential surface of the first component at a position away from the outlet. The hole is provided in the insertion portion of the first component, which is the portion on the outlet side of the first joint, and connects the inside and outside of the first component. The first joint is joined to the second component. The insertion portion of the first component is inserted into the interior of the second component from the inlet. A gap is formed between the insertion portion and the covering portion of the second component, which is the portion facing the insertion portion, so as to surround the insertion portion.

[0007] According to the above configuration, the insertion portion of the first component, which is positioned inside the covering portion of the second component, is provided with at least one hole. This makes it possible to suppress noise generation in the connection structure of the exhaust component.

[0008] In one aspect of this disclosure, the second component may be a tubular member. The end of the second component may be provided with an inlet, and the edge surrounding the inlet may be provided with a second joint which is a flange-like portion. The first joint may be joined to the second joint.

[0009] According to the above configuration, the first component and the second component can be connected properly. One aspect of this disclosure may further include a sound-absorbing material disposed between the insertion portion and the covering portion. With the above configuration, noise generated by the connection structure of the exhaust components can be further suppressed.

[0010] One aspect of this disclosure may further include a mesh member positioned downstream of the sound-absorbing material in the direction of exhaust flow. According to the above configuration, it is possible to suppress the movement of the sound-absorbing material downstream.

[0011] In one aspect of this disclosure, a reduced-diameter section may be provided in the second component at a position away from the inlet, where the size of the cross-section perpendicular to the exhaust flow direction in the second component decreases as it moves downstream in the exhaust flow direction. The mesh member may be arranged to abut against the reduced-diameter section.

[0012] According to the above configuration, the first component can be supported at the reduced diameter portion. Therefore, the strength against loads that press the first component downstream is improved. In one aspect of the present disclosure, the first joint may have first and second portions and a top portion. The first and second portions are wall-like portions projecting from the outer circumferential surface of the first component, provided to circumferentially surround the outer circumferential surface, and facing the direction of exhaust flow. The top portion connects the top of the first portion and the top of the second portion. The first joint may be formed by deforming the first component.

[0013] When the first joint of the above configuration is formed by deforming the first component, the position of the first joint may be constrained to a position at a certain distance or more from the outlet. As a result, the insertion portion between the first joint and the outlet becomes longer in the first component. In contrast, in the above configuration, noise is suppressed by at least one hole formed in the insertion portion. Therefore, the insertion portion that has become longer in order to form the first joint can be effectively utilized. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1A is an explanatory diagram showing the internal structure of the connection structure of the first embodiment. Figure 1B is an explanatory diagram of the first and second joints of the first embodiment. [Figure 2] Figure 2A is an explanatory diagram showing the internal structure of the connection structure of the second embodiment. Figure 2B is an explanatory diagram showing the internal structure of the connection structure of the third embodiment. [Figure 3] Figure 3A is an explanatory diagram showing the internal structure of the connection structure of the fourth embodiment. Figure 3B is an explanatory diagram showing the internal structure of the connection structure of the fifth embodiment. [Modes for carrying out the invention]

[0015] Embodiments to which this disclosure applies will be described below with reference to the drawings. [1. First Embodiment] [(1) Overview] The connection structure 1 of the first embodiment is mounted on a vehicle and connects the first component and the second component, and also has a sound-dampening function. The first and second components are exhaust components installed in the exhaust passage through which exhaust gas from the engine flows. As an example, the connection structure 1 connects the exhaust outlet 20 of the upstream exhaust pipe 2, which is located upstream in the direction of exhaust flow, and the exhaust inlet 30 of the downstream exhaust pipe 3, which is located downstream (see Figure 1A).

[0016] The upstream exhaust pipe 2 and the downstream exhaust pipe 3 are, for example, tubular members with a circular cross-section (hereinafter simply referred to as the cross-section) perpendicular to the direction of exhaust flow. The upstream exhaust pipe 2 includes a first joint portion 21, an insertion portion 22, a hole portion 23, and a cover portion 24. The downstream exhaust pipe 3 includes a second joint portion 31, a covering portion 32, a reduced diameter portion 33, a sound-absorbing material 34, and a mesh member 35. The connection structure 1 comprises these parts in the upstream exhaust pipe 2, these parts in the downstream exhaust pipe 3, a clamp 10, and a gasket 11.

[0017] [(2) Upstream exhaust pipe] <1st joint> The first joint 21 of the upstream exhaust pipe 2 is a portion that protrudes from the outer circumferential surface of the upstream exhaust pipe 2 and is provided so as to surround the outer circumferential surface, and is located at a predetermined distance from the outlet 20 located at the downstream end of the upstream exhaust pipe 2 (see Figure 1A). Furthermore, the first joint 21 is provided in the section of the upstream exhaust pipe 2 that extends in a straight line including the outlet 20.

[0018] The first joint 21 is formed by deforming the upstream exhaust pipe 2 and comprises first and second portions 21A and 21B, and a top portion 21C (see Figure 1B). The first and second portions 21A, 21B are wall-shaped portions protruding from the outer peripheral surface of the upstream-side exhaust pipe 2, wrap around the outer peripheral surface, and face the flow direction of exhaust gas. The first and second portions 21A, 21B may be in contact with each other, or may face each other with a slight gap therebetween.

[0019] The top portion 21C connects the top of the first portion 21A and the top of the second portion 21B. The top portion 21C curves in a U-shape in a cross section orthogonal to the circumferential direction. <Insertion portion, hole portion, and lid portion> The insertion portion 22 is a portion that forms the section from the first joint portion 21 to the outlet 20 in the upstream-side exhaust pipe 2, and extends linearly (see FIG. 1A). The insertion portion 22 is inserted into the downstream-side exhaust pipe 3.

[0020] Further, the hole portion 23 has at least one hole penetrating the insertion portion 22, and as an example, has a large number of small-diameter punching holes. Needless to say, the position, size, shape, and number of holes in the insertion portion 22 can be appropriately determined.

[0021] Further, the outlet 20 of the upstream-side exhaust pipe 2 is closed by the lid portion 24. A hole may be formed in the lid portion 24. Alternatively, the lid portion 24 may not be provided, and the outlet 20 of the upstream-side exhaust pipe 2 may be open.

[0022] [(3) Downstream-side exhaust pipe] <Second joint portion> The second joint portion 31 is a flange-shaped portion located surrounding the inlet 30 at the downstream end of the downstream-side exhaust pipe 3 (see FIG. 1A). As an example, the second joint portion 31 is formed by deforming the downstream-side exhaust pipe 3, protrudes from the outer peripheral surface of the downstream-side exhaust pipe 3, and is provided so as to surround the inlet 30 (see FIG. 1B).

[0023] The second joint 31 comprises a base portion 31A, a stepped portion 31B, and an outer edge portion 31C. The base portion 31A is the portion adjacent to the outer circumferential surface of the downstream exhaust pipe 3, and the outer edge portion 31C is the portion that forms the outer edge of the second joint 31. The stepped portion 31B is a stepped portion connecting the base portion 31A and the outer edge portion 31C, and extends in the direction of exhaust flow. The base portion 31A, the stepped portion 31B, and the outer edge portion 31C are arranged to encircle the outer circumferential surface of the downstream exhaust pipe 3.

[0024] <Coated part and reduced diameter part> The covering portion 32 is provided in the section of the downstream exhaust pipe 3 that extends linearly from the inlet 30 (see Figure 1A). The insertion portion 22 of the upstream exhaust pipe 2 is inserted into the covering portion 32, and the covering portion 32 faces the insertion portion 22. In addition, the covering portion 32 has a larger cross-sectional diameter than the insertion portion 22, and a gap is formed between the covering portion 32 and the insertion portion 22 so as to surround the insertion portion 22.

[0025] The reduced-diameter section 33 is provided at the downstream end of the covering section 32, and its cross-sectional diameter decreases as it moves downstream. The outlet 20 of the upstream exhaust pipe 2, which is inserted into the downstream exhaust pipe 3, reaches the reduced-diameter section 33 or is located slightly upstream of the reduced-diameter section 33.

[0026] <Gaskets and clamps> The upstream exhaust pipe 2 and the downstream exhaust pipe 3 are connected with the insertion portion 22 inserted into the covering portion 32 (see Figure 1A). At this time, the first joint portion 21 of the upstream exhaust pipe 2 and the second joint portion 31 of the downstream exhaust pipe 3 are joined by the clamp 10.

[0027] In other words, when connecting the upstream exhaust pipe 2 and the downstream exhaust pipe 3, the second portion 21B of the first joint 21 and the outer edge portion 31C of the second joint 31 come into contact. At this time, a gap is formed between the second portion 21B and the stepped portion 31B and base portion 31A of the second joint 31, surrounding the outer surface of the upstream exhaust pipe 2, and a ring-shaped gasket 11 is placed in this gap. This prevents exhaust gas from leaking from the gap between the first joint 21 and the second joint 31.

[0028] The clamp 10 is positioned to cover the first and second joints 21 and 31 from the outside, and the first and second joints 21 and 31 are fastened together by tightening the clamp 10 with bolts (not shown).

[0029] <Sound-absorbing materials and mesh components> The sound-absorbing material 34 is positioned in the gap between the insertion portion 22 of the upstream exhaust pipe 2 and the covering portion 32 of the downstream exhaust pipe 3, surrounding the insertion portion 22 (see Figure 1A). The sound-absorbing material 34 is positioned from slightly upstream of the outlet 20 (in other words, the reduced diameter portion 33) to near the inlet 30. As an example, the sound-absorbing material 34 is made of glass wool.

[0030] The mesh member 35 is also positioned in the gap between the insertion portion 22 and the covering portion 32, and is located downstream of the sound-absorbing material 34. The mesh member 35 is positioned to surround the insertion portion 22 near the exit 20 and abuts against the reduced diameter portion 33. The mesh member 35 may be a wire mesh, for example. The mesh member 35 is welded to either the insertion portion 22 or the covering portion 32.

[0031] [2. Second Embodiment] The connection structure 1 of the second embodiment differs from the first embodiment in that the downstream exhaust pipe 3 is not provided with a reduced diameter section 33, sound-absorbing material 34, and mesh member 35 (see Figure 2A).

[0032] In other words, the diameter of the cross-section of the covering portion 32 in the downstream exhaust pipe 3 and the downstream portion of the covering portion 32 are approximately constant, and in the second embodiment, the portion of the downstream exhaust pipe 3 facing the insertion portion 22 of the upstream exhaust pipe 2 becomes the covering portion 32.

[0033] Furthermore, similar to the first embodiment, a gap is formed between the covering portion 32 and the insertion portion 22 of the upstream exhaust pipe 2, but the sound-absorbing material 34 and the mesh member 35 are not placed in this gap.

[0034] [3. Third Embodiment] The connection structure 1 of the third embodiment differs from the first embodiment in that the downstream exhaust pipe 3 does not have a reduced diameter section 33, and in the position of the sound-absorbing material 34 and the mesh member 35 (see Figure 2B).

[0035] In other words, similar to the second embodiment, the diameter of the cross-section of the covering portion 32 in the downstream exhaust pipe 3 and the downstream portion of the covering portion 32 are approximately constant, and the portion of the downstream exhaust pipe 3 facing the insertion portion 22 of the upstream exhaust pipe 2 becomes the covering portion 32.

[0036] Furthermore, similar to the first embodiment, a gap is formed between the covering portion 32 and the insertion portion 22 of the upstream exhaust pipe 2, and sound-absorbing material 34 is placed in this gap. The sound-absorbing material 34 is placed from the outlet 20 of the upstream exhaust pipe 2 to the vicinity of the inlet 30 of the downstream exhaust pipe 3.

[0037] Furthermore, the mesh member 35 is positioned downstream of the insertion portion 22, along the inner circumferential surface of the downstream exhaust pipe 3. The mesh member 35 abuts against the edge surrounding the outlet 20 of the upstream exhaust pipe 2, and is positioned to surround the outlet 20 along this edge. The mesh member 35 is also welded to the downstream exhaust pipe 3.

[0038] [4. Fourth Embodiment] In the connection structure 1 of the fourth embodiment, the first joint portion 25 of the upstream exhaust pipe 2 is formed by welding a flange-shaped member made of plate material to the outer circumferential surface of the upstream exhaust pipe 2, which differs from the first embodiment (see Figure 3A). Similarly, in the connection structure 1 of the fourth embodiment, the second joint portion 36 of the downstream exhaust pipe 3 is formed by welding a flange-shaped member made of plate material to the outer circumferential surface of the downstream exhaust pipe 3, which differs from the first embodiment. Furthermore, the connection structure 1 of the fourth embodiment differs from the first embodiment in that the downstream exhaust pipe 3 is not provided with a reduced diameter portion 33, sound-absorbing material 34, and mesh member 35.

[0039] In other words, similar to the second embodiment, the diameter of the cross-section of the covering portion 32 in the downstream exhaust pipe 3 and the downstream portion of the covering portion 32 are approximately constant, and the portion of the downstream exhaust pipe 3 facing the insertion portion 22 of the upstream exhaust pipe 2 becomes the covering portion 32.

[0040] Furthermore, similar to the second embodiment, a gap is formed between the covering portion 32 and the insertion portion 22 of the upstream exhaust pipe 2, but the sound-absorbing material 34 and the mesh member 35 are not placed in this gap.

[0041] Furthermore, the first and second joints 25 and 36 are joined together by a plurality of bolts 12 that pass through them. [5. Fifth Embodiment] [(1) Overview] In the connection structure 1 of the fifth embodiment, the upstream exhaust pipe 2 is provided with a first joint portion 25 similar to that of the fourth embodiment, which is a difference from the first embodiment (see Figure 3B). Also, the connection structure 1 of the fifth embodiment differs from the first embodiment in that it connects the upstream exhaust pipe 2 and the muffler 4. The differences between the connection structure 1 of the fifth embodiment and the first embodiment will be explained below.

[0042] [(2) Muffler] The muffler 4 has a cylindrical shell 40 extending along axis A and end plates that close the openings at both ends of the shell 40 (see Figure 3B). The muffler 4 is also provided with an outlet section (not shown) that forms the exhaust outlet. The outlet section may be provided, for example, on the end plate.

[0043] The cross-section of the shell 40 perpendicular to axis A is, for example, roughly elliptical. Furthermore, the shell 40 is provided with an inlet hole 41 that forms an exhaust inlet, and the upstream exhaust pipe 2 is inserted into the inlet hole 41.

[0044] [(3) Upstream exhaust pipe] Similar to the fourth embodiment, the upstream exhaust pipe 2 has a first joint portion 25 located at a predetermined distance from the outlet 20 on its outer surface (see Figure 3B). The insertion portion 22 of the upstream exhaust pipe 2 is inserted into the shell 40 through the inlet hole 41, and the first joint portion 25 abuts against the outer surface of the shell 40.

[0045] As another example, the first joint 25 is welded to the outer circumferential surface of the shell 40. Furthermore, the portion of the shell 40 facing the insertion portion 22 becomes the covering portion. [6. Effects] (1) According to the above embodiment, the outlet 20 of the upstream exhaust pipe 2 is closed by the cover portion 24, and a hole portion 23 is formed in the insertion portion 22 of the upstream exhaust pipe 2. Therefore, exhaust gas flowing down the upstream exhaust pipe 2 passes through the hole portion 23 and flows out from the insertion portion 22. Thus, noise generation in the connection structure 1 can be suppressed.

[0046] (2) In the first to third embodiments, the first joint 21 and the second joint 31, which are formed by deforming the upstream exhaust pipe 2 and the downstream exhaust pipe 3 respectively, are joined by a clamp 10. In the fourth embodiment, the first joint 21 and the second joint 31, which are formed from thick plates welded to the upstream exhaust pipe 2 and the downstream exhaust pipe 3 respectively, are joined by a bolt 12. This allows the upstream exhaust pipe 2 and the downstream exhaust pipe 3 to be connected properly.

[0047] (3) Furthermore, according to the first and third embodiments, sound-absorbing material 34 is placed in the gap between the insertion portion 22 and the covering portion 32. This further suppresses noise generation in the connection structure 1.

[0048] (4) In addition, according to the first and third embodiments, a mesh member 35 welded to the insertion portion 22 or the covering portion 32 is arranged downstream of the sound-absorbing material 34. This prevents the sound-absorbing material 34 from moving downstream.

[0049] (5) Furthermore, according to the first embodiment, a reduced diameter portion 33 is provided downstream of the covering portion 32 of the downstream exhaust pipe 3, and the mesh member 35 is arranged to abut against the reduced diameter portion 33. Therefore, when a load is applied that pushes the upstream exhaust pipe 2 downstream, the upstream exhaust pipe 2 can be supported by the reduced diameter portion 33 via the mesh member 35 while the second joint portion 31 supports the upstream exhaust pipe 2. Thus, the strength against loads that push the upstream exhaust pipe 2 downstream is improved.

[0050] Furthermore, when inserting the insertion portion 22 into the covering portion 32 in order to assemble the upstream exhaust pipe 2 to the downstream exhaust pipe 3, the reduced diameter portion 33 allows for the positioning of the insertion portion 22 relative to the downstream exhaust pipe 3.

[0051] (6) In addition, according to the first embodiment, the first joint 21 is formed by deforming the upstream exhaust pipe 2. However, when the first joint 21 is formed in this manner, the section of the upstream exhaust pipe 2 including the outlet 20 must be straightened, and the position of the first joint 21 is constrained to a position at a certain distance or more from the outlet 20. For this reason, the insertion portion 22 of the upstream exhaust pipe 2 becomes longer. In contrast, in the first embodiment, noise is suppressed by the hole 23 formed in the insertion portion 22. For this reason, the insertion portion 22 that has become longer in order to form the first joint 21 can be effectively utilized.

[0052] [7. Other Embodiments] Multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Furthermore, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, some parts of the configuration of the above embodiment may be omitted. Furthermore, at least some parts of the configuration of the above embodiment may be added to or replaced with the configuration of other above embodiments. [Explanation of Symbols]

[0053] 1...Connection structure, 10...Clamp, 11...Gasket, 12...Bolt, 2...Upstream exhaust pipe, 20...Outlet, 21...First joint, 21A...First part, 21B...Second part, 21C...Top part, 22...Insertion part, 23...Hole part, 24...Lid part, 25...First joint, 3...Downstream exhaust pipe, 30...Inlet, 31...Second joint, 31A...Base part, 31B...Stepped part, 31C...Outer edge part, 32...Covering part, 33...Reduced diameter part, 34...Sound absorbing material, 35...Mesh member, 36...Second joint, 4...Muffler, 40...Shell, 41...Inlet hole.

Claims

1. A connection structure for exhaust components mounted on a vehicle, A first component is a tubular member in which an exhaust passage from the vehicle's engine is formed, A second component is a member having an exhaust passage formed inside, and having an inlet into which the exhaust outlet side portion of the first component is inserted. The first joint portion is a flange-shaped portion provided on the outer circumferential surface of the first component at a position away from the outlet, It is provided in the insertion portion of the first component, which is the portion on the exit side of the first joint, and has at least one hole connecting the inside and outside of the first component, Equipped with, The first joint is joined to the second part, The insertion portion of the first component is inserted into the interior of the second component from the entrance. A gap is formed between the insertion portion and the covering portion of the second component that faces the insertion portion, so as to encircle the insertion portion. Connection structure of exhaust components.

2. The exhaust component connection structure according to claim 1, The second component is a tubular member, The end of the second component is provided with the inlet, and the edge surrounding the inlet is provided with a flange-like second joint. The first joint is joined to the second joint. Connection structure of exhaust components.

3. The exhaust component connection structure according to claim 2, The system further comprises sound-absorbing material disposed between the insertion portion and the covering portion. Connection structure of exhaust components.

4. The exhaust component connection structure according to claim 3, The sound-absorbing material is further provided with a mesh member positioned downstream in the direction of exhaust flow. Connection structure of exhaust components.

5. The exhaust component connection structure according to claim 4, At a position away from the inlet in the second component, a reduced-diameter section is provided in which the size of the cross-section perpendicular to the exhaust flow direction in the second component decreases as it moves downstream in the direction of the exhaust flow. The mesh member is positioned to contact the reduced diameter portion. Connection structure of exhaust components.

6. An exhaust component connection structure according to any one of claims 1 to 5, The first joint is, The first part comprises a wall-like portion that protrudes from the outer peripheral surface, and is provided so as to encircle the outer peripheral surface, and having first and second portions that face the direction of exhaust flow, A top portion connecting the top of the first portion and the top of the second portion, It has, The first joint is formed by deforming the first component. Connection structure of exhaust components.

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