Exhaust pipe

Abstract

To suppress deviation of a cover member provided at an end part of an exhaust pipe.SOLUTION: An exhaust pipe includes: a first end part where a first opening is formed; a first flange part provided at the first end part; a cover member; and a suppression member. The cover member is provided at the first end part in such a manner that both ends oppose to each other having a gap, and includes a holding part and an inner peripheral part. When the first flange part is fastened with a second flange part of another exhaust pipe, the holding part is held by the first end part and the second end part of the other exhaust pipe. The inner peripheral part covers a portion adjacent to the first opening part on an inner peripheral surface of the exhaust pipe. The suppression part suppresses the cover member displacing along a first edge part surrounding the first opening.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an exhaust pipe.

Background Art

[0002] Parts used in a turbocharger of a vehicle engine and its surroundings are exposed to high-temperature exhaust gas, so they are required to have high-temperature oxidation resistance, and since heating and cooling occur repeatedly, they are also required to have repeated oxidation resistance. In particular, exhaust gas tends to flow unevenly on the downstream side of the turbocharger. For this reason, as described in Patent Document 1, local damage may occur due to the heat of the unevenly flowing exhaust gas in the portion fastened by the V-clamp in the exhaust pipe on the downstream side of the turbocharger.

[0003] On the other hand, conventionally, it has been considered to configure these parts with a material having high heat resistance, but this may make it difficult to process the shape, weld, etc., or increase the cost. Furthermore, it may be difficult to partially change the material of the parts. In such a case, even though a part of the part is damaged by high temperature, the material of the entire part has to be changed, and as a result, the cost increases more than necessary.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of such problems, it is conceivable to improve the heat resistance of the exhaust pipe by sandwiching a cover member between the edges of the openings of the exhaust pipe fastened by a V-clamp or the like and locally covering the periphery of the edge on the inner peripheral surface of the exhaust pipe with the cover member. However, due to the influence of vehicle vibration and the repeated occurrence of thermal expansion due to heating and contraction due to cooling, such a cover member may shift circumferentially along the edge of the opening of the exhaust pipe.

[0006] On the other hand, such a cover member is not provided over the entire circumference of the edge of the opening and may be arranged in a state of not covering a part of the edge. In such a case, an exposed portion not covered by the cover member is formed around the edge. And when such a circumferential shift occurs in the cover member, there is a risk that a portion where local damage is likely to occur due to the deflected exhaust gas will no longer be covered by the cover member.

[0007] In one aspect of the present disclosure, it is desirable to suppress the displacement of the cover member provided at the end of the exhaust pipe.

Means for Solving the Problems

[0008] One aspect of the present disclosure is an exhaust pipe that forms a flow path for exhaust gas of a vehicle, and includes a first end portion, a first flange portion, and a cover member. The first end portion has a first opening formed therein. The first flange portion is provided at the first end portion. The cover member is provided at the first end portion. The first flange portion is configured to be fastened to a second flange portion provided at a second end portion of another exhaust pipe connected to the first end portion of the exhaust pipe. The cover member has a clamping portion and an inner peripheral portion. The clamping portion is clamped by the first end portion and the second end portion when the first flange portion and the second flange portion are fastened. The inner peripheral portion covers a portion adjacent to the first opening on the inner peripheral surface of the exhaust pipe. The cover member is a curved member extending from a third end portion to a fourth end portion, and is configured to be provided at the first end portion such that the third end portion and the fourth end portion face each other with a gap therebetween. The exhaust pipe further includes a restraining portion that restrains the cover member provided at the first end portion from displacing along a first edge surrounding the first opening.

[0009] According to the above configuration, the suppression unit can suppress the displacement of the cover member in the circumferential direction of the first opening. Therefore, it is possible to suppress the displacement of the cover member provided at the end of the exhaust pipe. In one aspect of the present disclosure, the other exhaust pipe may discharge the exhaust gas that has passed through the outlet of the waste gate, which is a flow path of the exhaust gas that bypasses the turbine blade of the turbocharger. The outlet may be configured to be opened and closed by a valve body that rotates about a rotation axis extending along the edge of the outlet. The first opening and the outlet of the waste gate may be included. The section of the exhaust gas flow path inside the exhaust pipe and the other exhaust pipe may be used as the inlet section. At the first opening, when the rotation axis of the outlet of the waste gate is moved along the flow direction of the exhaust gas in the inlet section, the linear region through which the rotation axis passes is defined as the rotation axis region, and when the outlet is moved along the flow direction of the exhaust gas in the inlet section, the region through which the outlet passes may be defined as the outlet region. The gap of the cover member may be located on the opposite side of the outlet region from a straight line parallel to and including the rotation axis region.

[0010] Here, on the inner peripheral surface of the exhaust pipe, the portion that is not covered by the cover member due to the position of the gap of the cover member is defined as the exposed portion. According to the above configuration, it is possible to suppress the concentration of the exhaust gas flow on the exposed portion on the inner peripheral surface of the exhaust pipe.

[0011] In one aspect of the present disclosure, at the first end portion, the portion facing the clamping portion of the cover member may be used as the clamping surface. The suppression unit may have a first suppression unit and a second suppression unit. The first suppression unit is a sunken portion on the clamping surface at the first end portion. The second suppression unit protrudes from the clamping portion toward the first end portion side and is disposed on the first suppression unit.

[0012] According to the above configuration, it is possible to suitably suppress the displacement of the cover member provided at the end of the exhaust pipe. In one aspect of the present disclosure, at the first end portion, the portion facing the clamping portion of the cover member may be used as a clamping surface. The suppression portion may be a portion protruding from the clamping surface of the first end portion toward the other exhaust pipe side. The cover member may be provided at the first end portion in a state where the gap is located at the suppression portion.

[0013] According to the above configuration, the displacement of the cover member provided at the end portion of the exhaust pipe can be preferably suppressed.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the following embodiments, and various forms can be adopted as long as they belong to the technical scope of the present disclosure.

[0016] [1. First Embodiment] [(1) First Exhaust Pipe] The first exhaust pipe 1 constitutes a flow path for exhaust gas from the engine of the vehicle (see FIG. 1). As an example, the first exhaust pipe 1 is fastened by a V-clamp 5 on the downstream side of a second exhaust pipe 3 (in other words, another exhaust pipe) that discharges exhaust gas from the turbocharger. Further, the first exhaust pipe 1 is configured to accommodate a purification member (for example, a catalyst or a filter) that purifies exhaust gas.

[0017] The first and second exhaust pipes 1 and 3 may be made of an austenitic steel material having heat resistance, for example. However, the first and second exhaust pipes 1 and 3 are not limited to austenitic steel materials and may be made of other steel materials having heat resistance. Further, the second exhaust pipe 3 may be made of a material having higher heat resistance than the material constituting the first exhaust pipe 1.

[0018] The first exhaust pipe 1 includes a first end portion 10, a first opening 11, a first flange portion 12, and a cover member 2 (see FIGS. 1 and 2). The first opening 11 is a circular opening located at the first end portion 10 of the first exhaust pipe 1. The first opening 11 is located on the upstream side in the flow direction of the exhaust gas in the first exhaust pipe 1 and is connected to the second exhaust pipe 3. Note that the first opening 11 is not limited to a circular shape and may have various shapes. Hereinafter, a straight line passing through the center of the first opening 11 and perpendicular to the first opening 11 will be referred to as an axis 11A.

[0019] The first flange portion 12 is provided at the first end portion 10 of the first exhaust pipe 1 and is used for fastening to the second exhaust pipe 3. The first end portion 10 surrounds the first opening 11 and extends in a planar shape in a direction perpendicular to the axis 11A of the first opening 11. The first end portion 10 includes a groove portion 13 and a first edge portion 14.

[0020] The first edge portion 14 is a portion that protrudes from the first end portion 10 toward the second exhaust pipe 3 along the axis 11A, is adjacent to the first opening 11, and surrounds the first opening 11. The clamping surface 14A located at the top of the first edge portion 14 extends in a planar shape in a direction perpendicular to the axis 11A. Further, the inner peripheral surface of the first edge portion 14 forms the inner peripheral surface 15 of the first exhaust pipe 1.

[0021] The groove portion 13 is a groove-shaped portion provided at the first end portion 10 and surrounds the first opening 11. The groove portion 13 is provided adjacent to the outside of the first edge portion 14, and the outer peripheral surface 14B of the first edge portion 14 protrudes from the bottom surface of the groove portion 13 along the axis 11A.

[0022] Further, a first suppression portion 14C, which will be described later, is provided on the first edge portion 14. The cover member 2 has heat resistance and is provided at the first end portion 10. The configuration of the cover member 2 will be described later.

[0023] Further, hereinafter, the section including the first and second openings 11 and 31 in the exhaust gas flow paths inside the first and second exhaust pipes 1 and 3 will be referred to as the inlet section I (see FIG. 1). [(2) Second Exhaust Pipe] The second exhaust pipe 3 includes a second end portion 30, a second opening 31, a second flange portion 32, and a waste gate 6 (see FIG. 1).

[0024] The second opening 31 is located at the second end portion 30 of the second exhaust pipe 3. Further, the second opening 31 is connected to the first opening 11 of the first exhaust pipe 1, and its shape is the same as that of the first opening 11 (for example, circular).

[0025] The second flange portion 32 is provided at the second end portion 30 of the second exhaust pipe 3 and is used for fastening to the first exhaust pipe 1. The second end portion 30 surrounds the second opening 31 and extends in a planar shape in a direction perpendicular to the axis 11A of the first opening 11 of the first exhaust pipe 1 connected to the second opening 31. The second end portion 30 includes a recessed portion 33.

[0026] The recessed portion 33 is formed at the second end portion 30 so as to be adjacent to and surround the second opening 31, and has a bottom surface 34 and a first inner peripheral surface 35. The bottom surface 34 is a portion that extends flat in a direction orthogonal to the axis 10A of the first opening 11 connected to the second opening 31, and is provided so as to go around the inner peripheral surface of the second exhaust pipe 3. Further, the bottom surface 34 forms a step in the inner peripheral surface of the second exhaust pipe 3, and divides the inner peripheral surface into a first inner peripheral surface 35 and a second inner peripheral surface 36.

[0027] The first inner peripheral surface 35 is adjacent to and surrounds the second opening 31. Further, the first inner peripheral surface 35 is adjacent to the second inner peripheral surface 36 with the bottom surface 34 interposed therebetween, and the diameter of the first inner peripheral surface 35 is larger than the diameter of the second inner peripheral surface 36.

[0028] [(3) Waste gate] The waste gate 6 is a flow path of exhaust gas provided inside the second exhaust pipe 3, and the outlet 60 of the waste gate 6 is provided on the upstream side of the second opening 31 (see FIG. 1). The exhaust gas that bypasses the turbine blade of the turbocharger passes through the waste gate 6. On the other hand, the exhaust gas that has passed through the turbine blade passes through a region other than the waste gate 6 inside the second exhaust pipe 3. Therefore, from the second opening 31 of the second exhaust pipe 3, the exhaust gas that has passed through the turbine blade and the exhaust gas that has bypassed the turbine blade and flows out from the outlet 60 of the waste gate 6 flow out.

[0029] Note that the outlet 60 of the waste gate 6 is located in the above-described inlet section I. In the first embodiment, as an example, the inlet section I extends straight along the axis 11A (in other words, the flow direction of the exhaust gas), and the outlet 60 of the waste gate 6 faces the first opening 11 of the first exhaust pipe 1 along the axis 11A.

[0030] Further, a swing-type valve is provided at the outlet 60 of the waste gate 6, and the outlet 60 is opened and closed by a valve body 61 that rotates about a rotation axis 61A extending along an edge surrounding the outlet 60. In other words, the rotation axis 61A is included in the tangent line of the edge of the outlet 60.

[0031] [(4) Fastening of the exhaust pipe] When connecting the first opening 11 of the first exhaust pipe 1 and the second opening 31 of the second exhaust pipe 3, the first flange portion 12 and the second flange portion 32 are fastened by a V-clamp 5 (see Fig. 1). Note that the first and second flange portions 12, 32 may be fastened by means other than the V-clamp 5 (for example, fastening with bolts, welding, etc.).

[0032] When fastening the first and second flange portions 12, 32, the first edge portion 14 of the first end portion 10 of the first exhaust pipe 1 fits into the recessed portion 33 of the second end portion 30 of the second exhaust pipe 3. That is, the first edge portion 14 and the recessed portion 33 are used for positioning when connecting the first exhaust pipe 1 and the second exhaust pipe 3.

[0033] By fitting the first edge portion 14 into the recessed portion 33, the clamping surface 14A of the first edge portion 14 faces the bottom surface 34 of the recessed portion 33, and the outer peripheral surface 14B of the first edge portion 14 abuts against the first inner peripheral surface 35 of the recessed portion 33. Also, at this time, the portion outside the groove portion 13 at the first end portion 10 abuts against the second end portion 30, and the inner peripheral surface 15 of the first exhaust pipe 1 and the second inner peripheral surface 36 of the second exhaust pipe 3 are flush. Also, in order to seal the gap between the first opening 11 and the second opening 31, a ring-shaped gasket 4 is disposed in the groove portion 13 of the first end portion 10.

[0034] [(5) Cover member] The fastened first end portion 10 of the first exhaust pipe 1 and the second end portion 30 of the second exhaust pipe 3 sandwich the above-described cover member 2 (see Fig. 1). The cover member 2 is a member curved in an arc shape extending from the third end portion 22 to the fourth end portion 23 (see Figs. 2 and 3). In other words, the cover member 2 is C-shaped.

[0035] Therefore, the cover member 2 is provided on the first edge portion 14 of the first end portion 10 such that the third end portion 22 and the fourth end portion 23 face each other with a gap (hereinafter referred to as slit 24) formed therebetween. As an example, the cover member 2 is press-fitted into the first edge portion 14 and provided on the first edge portion 14 in a state where elastic deformation has occurred. Then, by the elastic force of the cover member 2, the position of the cover member 2 is urged to be held. When the cover member 2 is attached to the first edge portion 14, it is arranged to be curved in an arc shape along the edge of the first opening 11.

[0036] The cover member 2 includes a clamping portion 20, an inner peripheral portion 21, and a second restraining portion 25. The clamping portion 20 is a portion that spreads in the radial direction of the cover member 2. The inner peripheral portion 21 is a wall-like portion that protrudes from the inner peripheral edge of the clamping portion 20 and is provided from the third end portion 22 to the fourth end portion 23 of the clamping portion 20.

[0037] When the cover member 2 is provided on the first edge portion 14, the clamping portion 20 faces the clamping surface 14A of the first edge portion 14, and the inner peripheral portion 21 covers a portion adjacent to the first opening 11 on the inner peripheral surface 15 of the first exhaust pipe 1. At this time, the inner peripheral portion 21 may be in contact with the inner peripheral surface 15, or a slight gap may be formed between the inner peripheral portion 21 and the inner peripheral surface 15. And when the first and second flange portions 12, 32 are fastened, the clamping portion 20 is clamped by the clamping surface 14A and the bottom surface 34 of the recessed portion 33 of the second end portion 30.

[0038] Note that the second restraining portion 25 will be described later. Also, the cover member 2 is made of a material having higher heat resistance than the material constituting the first end portion 10 of the first exhaust pipe 1 and the like. Specifically, as an example, the cover member 2 may be made of a ferrite-based steel material. Of course, the cover member 2 may be made of other materials. Also, the heat resistance of the material constituting the cover member 2 may be the same as or lower than the heat resistance of the material constituting the first end portion 10 of the first exhaust pipe 1 and the like.

[0039] Further, the cover member 2 may further have an outer peripheral portion which is a wall-like portion protruding in the same direction as the inner peripheral portion 21 from the edge portion on the outer peripheral side of the sandwiching portion 20. Further, the outer peripheral portion may be provided from the third end portion 22 to the fourth end portion 23 of the sandwiching portion 20.

[0040] [(6) Suppression portion] The first suppression portion 14C of the first edge portion 14 in the first exhaust pipe 1 and the second suppression portion 25 of the cover member 2 suppress the cover member 2 sandwiched between the first and second end portions 10 and 30 from being displaced in the circumferential direction along the first edge portion 14 (see FIGS. 2 to 4).

[0041] The first suppression portion 14C is a notch portion in the first edge portion 14 and forms a portion recessed on the downstream side in the sandwiching surface 14A. As an example, the first suppression portion 14C forms a rectangular parallelepiped-shaped depression in the first edge portion 14, extends from the end portion of the sandwiching surface 14A to the downstream side, and has two wall surfaces 14D facing each other in the circumferential direction.

[0042] The second suppression portion 25 is provided at the fourth end portion 23 of the cover member 2 and protrudes from the sandwiching portion 20 toward the first exhaust pipe 1 side (in other words, the first end portion 10 side). Of course, the second suppression portion 25 may be provided at the third end portion 22 of the cover member 2.

[0043] The cover member 2 is provided such that the first suppression portion 14C is located in the slit 24, and the second suppression portion 25 is disposed in the first suppression portion 14C. More specifically, the second suppression portion 25 extends so as to curve from the portion located at the fourth end portion 23 in the sandwiching portion 20 toward the first suppression portion 14C. Then, when the second suppression portion 25 catches on any one of the wall surfaces 14D in the first suppression portion 14C, the displacement of the cover member 2 in the circumferential direction of the first opening 11 is suppressed.

[0044] [(7) Position of the slit] Since the cover member 2 is provided with a slit 24, the portion of the inner peripheral surface 15 of the first exhaust pipe 1 where the slit 24 is located becomes an exposed portion not covered by the cover member 2. Therefore, if the exhaust gas flow from the second exhaust pipe 3 concentrates on the exposed portion, there is a risk of damage to the exposed portion. Accordingly, the position of the slit 24 of the cover member 2 is adjusted so that the exhaust gas flow does not concentrate on the exposed portion (see FIG. 4). As an example, the position of the slit 24 is determined based on the rotation axis 61A of the valve body 61 in the valve at the outlet 60 of the waste gate 6.

[0045] Here, in the first opening 11, when the rotation axis 61A is moved along the exhaust gas flow direction (in other words, the axis line 11A) in the inlet section I, the linear region through which the rotation axis 61A passes is defined as the rotation axis region 62A. Also, in the first opening 11, when the outlet 60 of the waste gate 6 is moved along the exhaust gas flow direction in the inlet section I, the region through which the outlet 60 passes is defined as the outlet region 60A.

[0046] The slit 24 includes the rotation axis region 62A and is located on the opposite side of the outlet region 60A from a straight line 62B parallel to the rotation axis region 62A. Incidentally, for the sake of clarity, it is noted that the straight line 62B crosses the first opening 11 and the first edge portion 14.

[0047] [(8) Modification example of the position of the slit] In addition to this, when the direction of the outlet 60 of the waste gate 6 is inclined with respect to the axis line 11B, the position of the slit 24 may be adjusted based on the direction of the exhaust gas passing through the outlet 60 (hereinafter referred to as the outlet direction) so that the exhaust gas flow does not concentrate on the exposed portion. Incidentally, in this case, it is noted for the sake of clarity that the outlet direction is inclined with respect to the axis line 11B.

[0048] That is, the waste gate 6 has an outlet section 63 and an inlet section 64. The outlet section 63 is a curved section including an outlet 60 (see FIG. 5). The above-described outlet direction is determined based on the degree of curvature of the outlet section 63 and the orientation of the outlet 60. The inlet section 64 is a linearly extending section adjacent to the upstream side of the outlet section 63. Then, the exhaust gas entering the outlet section 63 passes through the inlet 63A of the outlet section 63 along the extension direction of the inlet section 64 (hereinafter referred to as the inlet direction). The inlet direction is different from the outlet direction.

[0049] Here, on the inner peripheral surfaces 15 and 36 of the first and second exhaust pipes 1 and 3 forming the inlet section I, when the outlet 60 of the waste gate 6 is moved in the outlet direction, the portion through which the outlet 60 passes is defined as a first extension region 60B. The first extension region 60B intersects the first edge 14 or is located upstream of the first edge 14.

[0050] Also, at the first edge 14, the portion through which the first extension region 60B moved in the flow direction of the exhaust gas in the inlet section I passes is defined as a first impossible region N0. Also, at the first edge 14, the portion facing the first impossible region N0 across the center of the first opening 10 (in other words, the axis 11A) is defined as a second impossible region N1. Note that the first impossible region N0 and the second impossible region N1 are in a point-symmetrical relationship about the axis 11A.

[0051] The flow of the exhaust gas from the waste gate 6 tends to concentrate on the peripheral portion of the first impossible region N0 on the inner peripheral surface 15 of the first exhaust pipe 1. Further, after the exhaust gas collides with the peripheral portion of the first impossible region N0 and heads toward the front of the peripheral portion, the peripheral portion of the second impossible region N1 on the inner peripheral surface 15 of the first exhaust pipe 1 also tends to concentrate the flow of the exhaust gas from the waste gate 6.

[0052] For this reason, the slit 24 of the cover member 2 may be arranged in a region other than the first and second impossible regions N0 and N1 at the first edge 14. Thereby, it is possible to prevent the flow of the exhaust gas from concentrating on the exposed portion.

[0053] In addition to this, the position of the slit 24 may be determined as follows. That is, on the inner peripheral surfaces 15 and 36 of the first and second exhaust pipes 1 and 3 forming the inlet section I, the portion through which the inlet 63A passes when the inlet 63A of the outlet section 63 is moved in the advancing direction is defined as the second extension region 63B (see FIG. 6). The second extension region 63B is located upstream of the first edge 14. And at the first edge 14, the portion through which the second extension region 63B moved in the exhaust gas flow direction of the inlet section I passes is defined as the reference region R.

[0054] Furthermore, at the first edge 14, the region between the first impossible region N0 and the end of the reference region R closest to the first impossible region N0 is defined as the intermediate region. And the first impossible region N0 and the intermediate region are defined as the third impossible region N2. Also, at the first edge 14, the portion facing the third impossible region N2 across the center of the first opening 10 is defined as the fourth impossible region N3. Note that the third impossible region N2 and the fourth impossible region N3 are in a point-symmetrical relationship about the axis 11A.

[0055] Considering the shape of the waist gate 6, the exhaust gas flow from the waist gate 6 tends to concentrate on the peripheral portion of the third impossible region N2 on the inner peripheral surface 15 of the first exhaust pipe 1. Furthermore, the peripheral portion of the fourth impossible region N3 on the inner peripheral surface 15 of the first exhaust pipe 1 also tends to concentrate the exhaust gas flow from the waist gate 6.

[0056] For this reason, the slit 24 of the cover member 2 may be arranged in a region other than the third and fourth impossible regions N2 and N3 at the first edge 14. Thereby, it is possible to prevent the exhaust gas flow from concentrating on the exposed portion.

[0057] [2. Second Embodiment] The first exhaust pipe 1 of the second embodiment is different from the first embodiment in the configuration of the suppression portion. Hereinafter, the differences between the first exhaust pipe 1 of the second embodiment and the first embodiment will be described.

[0058] In the second embodiment, the first suppression portion 14C of the first exhaust pipe 1 forms a recessed portion on the clamping surface 14A, similar to the first embodiment (see FIGS. 7 and 8). In the second embodiment, as an example, the first suppression portion 14C forms a triangular-shaped depression when viewed in the radial direction on the first edge portion 14.

[0059] On the other hand, the second suppression portion 25 of the cover member 2 is provided at a position away from the third and fourth end portions 22 and 23 of the cover member 2, and is configured as a protruding portion that protrudes toward the first exhaust pipe 1 side in the clamping portion 20. As an example, the second suppression portion 25 has a shape bent in a triangular shape.

[0060] And the cover member 2 is provided such that the second suppression portion 25 is disposed on the first suppression portion 14C. As an example, the second suppression portion 25 is in a state of being fitted to the first suppression portion 14C, whereby displacement of the cover member 2 in the circumferential direction of the first opening 11 is suppressed.

[0061] [3. Third Embodiment] The first exhaust pipe 1 of the third embodiment is different from the first embodiment in the configuration of the suppression portion. Hereinafter, the differences between the first exhaust pipe 1 of the third embodiment and the first embodiment will be described.

[0062] In the third embodiment, the cover member 2 is not provided with a second suppression portion (see FIGS. 9 and 10). On the other hand, the first suppression portion 14C of the first exhaust pipe 1 is configured as a portion that protrudes from the clamping surface 14A of the first edge portion 14 toward the second exhaust pipe 3 side.

[0063] And the cover member 2 is provided on the first edge portion 14 such that the first suppression portion 14C is located in the slit 24. That is, the first suppression portion 14C is located between the third and fourth end portions 22 and 23 of the cover member 2, and by the third or fourth end portion 22 or 23 of the cover member 2 abutting on the first suppression portion 14C, displacement of the cover member 2 in the circumferential direction of the first opening 11 is suppressed. Although a slight gap is provided between the first suppression portion 14C and the third and fourth end portions 22 and 23, the third and fourth end portions 22 and 23 may abut on the first suppression portion 14C.

[0064] [4. Effects] (1) According to the first and second embodiments, the displacement of the cover member 2 provided at the first end portion 10 of the first exhaust pipe 1 can be suppressed by the first suppression portion 14C of the first exhaust pipe 1 and the second suppression portion 25 of the cover member 2. Further, according to the third embodiment, the displacement of the cover member 2 provided at the first end portion 10 of the first exhaust pipe 1 can be suppressed by the first suppression portion 14C and the slit 24 of the cover member 2.

[0065] (2) Further, the position of the slit 24 of the cover member 2 is determined based on the position of the rotation axis 62 when the valve body 61 opens and closes the outlet 60 of the waste gate 6. That is, the slit 24 includes the rotation axis region 62A in the first opening 10 and is located on the opposite side of the outlet region 60A from the straight line 62B parallel to the rotation axis region 62A. For this reason, when the valve body 61 opens the outlet 60, the exhaust gas flowing out from the outlet 60 is suppressed from flowing toward the slit 24 side by the valve body 61. Therefore, it is possible to promote that the flow of the exhaust gas does not concentrate on the exposed portion on the inner peripheral surface 15 of the first exhaust pipe 1.

[0066] [5. Other Embodiments] (1) In the first to third embodiments, a cover member 2 may be provided at the second end portion 30 with the same configuration so that the inner peripheral surface of the second exhaust pipe 3 is covered by the cover member 2.

[0067] Further, in the first to third embodiments, the cover member 2 is provided at the first end portion 10 which is located on the downstream side of the turbocharger and on the upstream side of the first exhaust pipe 1 that houses the purification member. However, the present invention is not limited to this. For example, the end portion on the downstream side of the first exhaust pipe 1, the end portion of another exhaust pipe mounted on the vehicle, and the end portion of the exhaust pipe fastened to these end portions may be configured in the same manner as the first and second end portions 10 and 30. And the cover member 2 may be provided at these fastened end portions in the same manner as in the above embodiments.

[0068] (2) In the first to third embodiments, the clamping portion 20 of the cover member 2 is disposed on the clamping surface 14A located at the top of the first edge portion 14. However, for example, a portion adjacent to the first opening 11 in the first end portion 10 formed as a flat surface without a step may be used as the clamping surface, and the clamping portion 20 of the cover member 2 may be disposed on the clamping surface. Further, for example, by recessing a portion adjacent to the first opening 11 in the first end portion 10, a step is formed so as to surround the first opening 11, and the bottom surface of the step is used as the clamping surface, and the clamping portion 20 of the cover member 2 may be disposed on the clamping surface. Then, in the same manner as in the first to third embodiments, the first suppression portion 14C may be formed in the portion where the clamping portion 20 is disposed, and the second suppression portion 25 may be formed in the cover member 2.

[0069] (3) A plurality of functions of one component in the above embodiment may be realized by a plurality of components, or one function of one component may be realized by a plurality of components. Further, a plurality of functions of a plurality of components may be realized by one component, or one function realized by a plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of another above embodiment.

Description of Reference Numerals

[0070] 1... First exhaust pipe, 10... First end portion, 11... First opening, 11A... Axis, 12... First flange portion, 14... First edge portion, 14A... Clamping surface, 14B... Outer peripheral surface, 14C... First suppression portion, 14D... Wall surface, 15... Inner peripheral surface, 2... Cover member, 20... Clamping portion, 21... Inner peripheral portion, 22... Third end portion, 23... Fourth end portion, 24... Slit, 25... Second suppression portion, 3... Second exhaust pipe, 30... Second end portion, 31... Second opening, 32... Second flange portion, 33... Recessed portion, 34... Bottom surface, 35... First inner peripheral surface, 36... Second inner peripheral surface, 5... V clamp, 6... Waste gate, 60... Outlet, 60A... Outlet region, 61... Valve body, 62... Rotation axis, 62A... Rotation axis region, 62B... Straight line.

Claims

1. An exhaust pipe that forms a flow path for the exhaust gas of a vehicle, a first end portion in which a first opening is formed, a first flange portion provided at the first end portion, and a cover member provided at the first end portion, and the first flange portion is configured to be fastened to a second flange portion provided at a second end portion of another exhaust pipe connected to the first end portion of the exhaust pipe, the cover member has a clamping portion clamped between the first end portion and the second end portion when the first flange portion and the second flange portion are fastened, and an inner peripheral portion covering a portion adjacent to the first opening on the inner peripheral surface of the exhaust pipe, the cover member is a curved member extending from a third end portion to a fourth end portion, and is configured to be provided at the first end portion such that the third end portion and the fourth end portion face each other with a gap therebetween, the exhaust pipe further includes a restraining portion that restrains displacement of the cover member provided at the first end portion along a first edge portion surrounding the first opening Exhaust pipe.

2. The exhaust pipe according to claim 1, wherein the other exhaust pipe discharges exhaust gas that has passed through an outlet of a waste gate, which is a flow path for exhaust gas that bypasses a turbine blade of a turbocharger, and the outlet is configured to be opened and closed by a valve body that rotates about a rotation axis extending along an edge portion of the outlet, a section of the flow path of the exhaust gas inside the exhaust pipe and the other exhaust pipe that includes the first opening and the outlet of the waste gate is defined as an inlet section, at the first opening, when the rotation axis of the outlet of the waste gate is moved along the flow direction of the exhaust gas in the inlet section, a linear region through which the rotation axis passes is defined as a rotation axis region, and when the outlet is moved along the flow direction of the exhaust gas in the inlet section, a region through which the outlet passes is defined as an outlet region, and the gap of the cover member is located on the opposite side of the outlet region from a straight line that includes the rotation axis region and is parallel to the rotation axis region Exhaust pipe.

3. The exhaust pipe according to claim 1 or claim 2, at the first end portion, a portion facing the clamping portion of the cover member is defined as a clamping surface, the restraining portion has a first restraining portion that is a recessed portion on the clamping surface of the first end portion, and a second restraining portion that protrudes from the clamping portion toward the first end portion side and is disposed in the first restraining portion Exhaust pipe.

4. An exhaust pipe according to claim 1 or claim 2, wherein: At the first end portion, a portion facing the clamping portion of the cover member is defined as a clamping surface; The suppressing portion is a portion protruding from the clamping surface of the first end portion toward the other exhaust pipe side; The cover member is provided at the first end portion in a state where the gap is located at the suppressing portion; Exhaust pipe.

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