Exhaust pipe and engine

Abstract

An exhaust pipe includes a plurality of pipe bodies formed in a cylindrical shape with an axis as a center and arranged in an axis direction, a connection portion connecting a pair of adjacent pipe bodies to each other, and a gasket provided between the pipe bodies and the connection portion. The pipe body has a flange extending outward at an end portion in the axis direction. The connection portion has a connection body formed in a cylindrical shape with the axis as a center and a press ring formed with an opposing surface. The opposing surface opposes the flange with the gasket interposed therebetween. The exhaust pipe further includes a coupling member provided at intervals in a circumferential direction to couple the flange and the press ring, and an anti-deformation member provided at an outer circumferential side of a gap between the flange and the press ring.

Description

Technical Field

[0001] This disclosure relates to exhaust pipes and engines.

[0002] This application claims priority to Japanese Patent Application No. 2021-009890, filed in Japan on January 25, 2021, the contents of which are incorporated herein by reference. Background Technology

[0003] A diesel or gas engine comprises an engine body with multiple combustion chambers housing pistons, an exhaust pipe that directs exhaust gases generated by the engine body to external equipment such as a turbocharger, and branch pipes. Each combustion chamber is connected to the exhaust pipe via a branch pipe. That is, exhaust gases merging from each branch pipe flow within the exhaust pipe. The exhaust pipe is cylindrical about an axis, with the aforementioned branch pipes connected at midpoints along the axis.

[0004] Here, during engine operation, the temperature of the exhaust gas reaches approximately 500°C. Due to the thermal stress of this exhaust gas, the exhaust pipe may undergo thermal deformation in the axial direction. To absorb this thermal deformation, a technique described in, for example, Patent Document 1 is used. In Patent Document 1, a telescopic tube capable of extending and retracting in the axial direction is provided between multiple exhaust pipes arranged along the axial direction. By extending and retracting the telescopic tubes according to the thermal deformation of the exhaust pipes, the effects of this thermal deformation can be avoided.

[0005] Typically, the exhaust main and the telescopic pipe described above are connected to each other via a flange as shown in Patent Document 2. Specifically, a flange extending outwards is provided at the end of the exhaust main. The end of the telescopic pipe is clamped between the annular member and the flange by a ring-shaped member. The annular member and the flange are connected by bolts and nuts. Furthermore, to prevent exhaust gas leakage, a sealing gasket is provided at such a connection. The sealing gasket is clamped between the annular member and the flange.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2003-286842

[0009] Patent Document 2: (Japan) Published Patent No. 61-51431 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] As the engine ages, the gaskets need to be replaced periodically. At this time, the flange may deform due to thermal stress. Therefore, even when the bolts are tightened to the specified torque, there is a possibility that proper surface pressure cannot be ensured between the flange and the annular component. As a result, the sealing performance between the exhaust manifold and the telescoping pipe will decrease.

[0012] This disclosure was created to solve the aforementioned technical problems, and its purpose is to provide an exhaust pipe and engine that further reduce exhaust gas leakage.

[0013] Technical solutions for solving the problem

[0014] To address the aforementioned technical problems, this disclosure provides an exhaust pipe comprising: a plurality of pipe bodies formed into a cylindrical shape centered on an axis and arranged along the axial direction, through which exhaust gas from an engine flows; a connecting portion connecting a pair of adjacent pipe bodies in the axial direction; a sealing gasket disposed between the pipe bodies and the connecting portion, having a flange extending outwardly at the end of the pipe body in the axial direction; the connecting portion comprising: a connecting portion body formed into a cylindrical shape centered on the axis; a pressure ring having opposing surfaces, the opposing surfaces being positioned opposite the flange such that the sealing gasket is sandwiched between the pressure ring and the flange; the exhaust pipe further comprising: a connecting member disposed at intervals in the circumferential direction, for connecting the flange and the pressure ring; and an anti-deformation member disposed in the region on the outer periphery of the gap.

[0015] Invention Effects

[0016] According to this disclosure, an exhaust pipe and engine that can further reduce exhaust gas leakage can be provided. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the structure of the engine according to the first embodiment of this disclosure.

[0018] Figure 2 This is a side view of the exhaust pipe according to the first embodiment of this disclosure.

[0019] Figure 3 yes Figure 2 A cross-sectional view along line III-III.

[0020] Figure 4 yes Figure 3 A cross-sectional view along line IV-IV.

[0021] Figure 5 This is an enlarged cross-sectional view of the main part of a modified example of the exhaust pipe according to the first embodiment of this disclosure.

[0022] Figure 6This is an enlarged cross-sectional view of the main part of a further modified example of the exhaust pipe according to the first embodiment of this disclosure.

[0023] Figure 7 This is an enlarged cross-sectional view of the main part of the exhaust pipe according to the second embodiment of this disclosure. Detailed Implementation

[0024] <First Implementation Method>

[0025] Below, refer to Figures 1-4 The engine 100 and exhaust pipe 90 of the first embodiment of this disclosure will be described.

[0026] (Engine structure)

[0027] Engine 100 is, for example, a diesel engine or a gas engine used as a power source for a ship or power plant. Engine 100 includes an engine body 1, an exhaust pipe 90, and a branch pipe 2A. The engine body 1 is formed in a block shape, and a plurality of combustion chambers 2 are formed therein (for example, 12). In this embodiment, 6 combustion chambers 2 are formed in 2 rows. Pistons (not shown) are housed in these combustion chambers 2.

[0028] For example, in the case of a diesel engine, the fuel supplied to the combustion chamber 2 is compressed by the forward and backward movement of the piston, and the fuel spontaneously combusts. This action occurs continuously at staggered intervals in each combustion chamber 2, thereby rotating the output shaft of the engine 100. The rotational energy of the output shaft is extracted from the shaft end for various uses (e.g., propeller drive in the case of a ship, generator drive in the case of a power plant).

[0029] Within each combustion chamber 2, exhaust gas is generated along with the combustion of fuel. This exhaust gas is directed to an external turbocharger via exhaust pipe 90. More specifically, one end of a branch pipe 2A for exhaust gas flow is connected to each combustion chamber 2. The other end of the branch pipe 2A is connected to the exhaust pipe 90. That is, a total of 12 branch pipes 2A are connected to the exhaust pipe 90. The exhaust pipe 90 extends along the arrangement direction of the combustion chambers 2.

[0030] (Structure of the exhaust pipe)

[0031] Next, refer to Figures 2-4 The structure of exhaust pipe 90 is explained. For example... Figure 2 or Figure 4 As shown, the exhaust pipe 90 includes multiple pipe bodies 10, flanges 11, connecting portions 20, and sealing gaskets G (see reference). Figure 4 ), connecting component 30, and anti-deformation component 40.

[0032] like Figure 2As shown, multiple pipe bodies 10 are arranged at intervals along the axis Ac of the exhaust pipe 90. The pipe bodies 10 form a cylindrical shape centered on the axis Ac. The outer diameter of the pipe body 10 is, for example, approximately 600 mm. Furthermore... Figure 4 As shown, a flange 11 is provided at the end of the tube body 10 in the direction of axis Ac. The flange 11 is formed into an annular shape by extending from the tube body 10 toward the outer periphery. The flange 11 is joined to the tube body 10 by welding.

[0033] like Figure 2 As shown, the connecting portion 20 connects a pair of adjacent pipe bodies 10 to each other. The connecting portion 20 has a connecting portion body 21 and a pressure ring 22. The connecting portion body 21 is capable of telescoping along the axis Ac. Specifically, as... Figure 4 As shown, the connecting body 21 has an edge portion 21A, a parallel portion 21B, and a telescopic portion 21C. The edge portion 21A is the portion sandwiched between the aforementioned flange 11 and the pressure ring 22 described later.

[0034] Edge portion 21A is formed as an annular plate centered on axis Ac. Parallel portion 21B is formed as a cylinder extending from the inner circumferential end edge of edge portion 21A in the direction of axis Ac. Telescopic portion 21C is connected to the end edge of parallel portion 21B on the opposite side to edge portion 21A. Telescopic portion 21C faces the outer circumferential side and has a curved diameter when viewed in cross-section. When a force is applied to telescopic portion 21C in the direction of axis Ac, the entire connecting body 21 flexes and expands through telescopic portion 21C.

[0035] The pressure ring 22 is formed in a circular shape centered on the axis Ac. The inner circumferential edge of the pressure ring 22 (inner circumferential edge 22T) is located radially inside the inner circumferential edge of the flange 11. Furthermore, this inner circumferential edge 22T contacts the aforementioned parallel portion 21B. The pressure ring 22 is separated from the axis Ac by a gap S and faces the surface of the flange 11 on the axis Ac side (flange opposing surface 11S).

[0036] The face of the pressure ring 22 facing the opposite side of the axis Ac (the face opposite to the flange 11) becomes the opposing face 22S. That is, the gap S is surrounded by the flange opposing face 11S and the opposing face 22S from the axis Ac direction. The sealing gasket G and the edge portion 21A are sandwiched in the gap S. Specifically, the sealing gasket G is located on the opposite side of the axis Ac direction within the gap S, and the edge portion 21A is located on one side of the axis Ac direction. These sealing gaskets G and edge portions 21A fit tightly together. The sealing gasket G is formed as an annular plate centered on the axis Ac. The sealing gasket G is integrally formed, for example, from SUS. It is not shown in detail, but the interior of the sealing gasket G is hollow, configured to flex when pressed from both sides in the axis Ac direction.

[0037] A circular notch 22R is formed in the region radially outer of the bolt (described later) on the opposing surface 22S of the pressure ring 22. The notch 22R is recessed toward the axis Ac and extends circumferentially. The notch 22R is provided to retain the anti-deformation component 40 described later.

[0038] As described above, the coupling component 30 joins the flange 11 and the pressure ring 22 in a state where the sealing gasket G and the edge portion 21A are sandwiched in the gap S. Figure 3 As shown, multiple coupling components 30 are provided at circumferential intervals (12 in one example). Each coupling component 30 consists of a bolt and a nut. Specifically, holes for the bolt to be inserted are formed in the flange 11 and the pressure ring 22. The outer peripheral edge of the edge portion 21A (edge ​​portion edge 21t) and the outer peripheral edge of the sealing gasket G (sealing gasket edge Gt) are located radially inward compared to the bolt within the gap S. That is, the middle portion of the bolt is exposed in the gap S.

[0039] An anti-deformation component 40 is disposed in the aforementioned gap S. The anti-deformation component 40 is provided to uniformly distribute the surface pressure radially between the flange 11 and the pressure ring 22. Figure 3 or Figure 4 As shown, the anti-deformation component 40 is inserted from the outer peripheral side relative to the gap S. Additionally, as... Figure 3 As shown, multiple anti-deformation components 40 are provided at intervals in the circumferential direction (12 in one example). The circumferential position of the anti-deformation component 40 coincides with the circumferential position of the connecting component 30. That is, one anti-deformation component 40 is provided on the outer periphery of each connecting component 30. Figure 4 As shown, the anti-deformation member 40 has a base 41 located on the outer periphery and a tapered portion 42 extending from the base 41 toward the inner periphery.

[0040] The base 41, viewed from the axis Ac, is formed as a plate with an arc-shaped cross-section. A through hole h extending circumferentially is formed in the base 41. A wire W is inserted into this through hole h. Figure 3 As shown, line W is provided to keep the multiple anti-deformation components 40 from detaching. For example... Figure 4 As shown, the tapered portion 42 is integrally formed on the radially inner end face of the base 41, and its dimension in the direction of the axis Ac gradually decreases as it moves radially inward. That is, the tapered portion 42 has a triangular cross-sectional shape when viewed in section including the axis Ac. The two surfaces of the tapered portion 42 facing the axis Ac are respectively called tapered surfaces 42S. When the anti-deformation member 40 is inserted into the gap S, one tapered surface 42S abuts against the outer peripheral end edge of the cut 22R, and the other tapered surface 42S abuts against the outer peripheral end edge of the flange opposing surface 11S.

[0041] (Effects)

[0042] Next, the assembly method of the exhaust pipe 90 in this embodiment and the operation of the exhaust pipe 90 when the engine 100 is running will be described.

[0043] When assembling the exhaust pipe 90, firstly, multiple pipe bodies 10 are connected using the connecting part 20. Specifically, the sealing gasket G and the edge 21A of the connecting part body 21 are clamped using the flange 11 and the pressure ring 22. In this state, the flange 11 and the pressure ring 22 are tightened using bolts and nuts, which serve as connecting parts 30. The tightening torque of the bolts at this time is a predetermined value. It should be noted that if the bolts are tightened beyond this predetermined value, the flange 11 may deform and tilt towards the axis Ac with the joint (welded part) with the pipe body 10 as the fulcrum. In other words, the predetermined value is appropriately determined within a range that prevents such deformation.

[0044] Next, in the aforementioned state, the anti-deformation component 40 is inserted into the gap S from the outer periphery. Specifically, first, multiple anti-deformation components 40 with wire W inserted are respectively positioned on the outer periphery of the gap S. Then, a striking force is applied to the base 41 of the anti-deformation component 40 using a hammer or the like, pressing it into the gap S. As a result, the conical surface 42S of the anti-deformation component 40 is tightly fitted with the flange 11 and the pressure ring 22, becoming unable to detach. Finally, the wire W is tightened. Thus, the assembly of the exhaust pipe 90 is completed.

[0045] Next, the operation of the exhaust pipe 90 when the engine 100 is running will be explained. During the operation of the engine 100, exhaust gas at approximately 500°C is generated in the combustion chamber 2. This exhaust gas is sent into the exhaust pipe 90 through the branch pipe 2A. The exhaust pipe 90 undergoes thermal deformation in the direction of the axis Ac due to the heat of the exhaust gas. This thermal deformation is absorbed by the extension portion 21C of the connecting portion 20 bending along the axis Ac as described above. As a result, the relative position of the exhaust pipe 90 and the branch pipe 2A can be maintained, allowing the engine 100 to operate stably and continuously.

[0046] Here, as the sealing performance of the gasket G decreases with years of use, it is necessary to replace the gasket G and retighten the bolts and nuts after removing the bolts and nuts that serve as the connecting parts 30. At this time, the flange 11 itself may undergo thermal deformation due to the heat of the exhaust gas. Specifically, the flange 11 may deform and tilt in the direction of the axis Ac, with the joint between the flange 11 and the pipe body 10 as the fulcrum. That is, in the area on the outer periphery of the gap S, the dimension in the direction of the axis Ac is smaller than initially. In this case, even if the bolts and nuts are tightened to the specified torque, the tightening force may not be sufficiently transmitted between the flange 11 and the pressure ring 22, and the surface pressure on the gasket G may not be guaranteed.

[0047] Therefore, in this embodiment, as described above, an anti-deformation member 40 is provided within the gap S. Specifically, the anti-deformation member 40 is provided in the region on the outer periphery of the gap S formed between the flange 11 and the pressure ring 22. By arranging this anti-deformation member 40 within the gap S, the flange 11 and the pressure ring 22 are mechanically joined in the region on the outer periphery of the gap S. That is, if the flange 11 and the pressure ring 22 are tightened using the joining member 30, the tightening force is transmitted between these flange 11 and pressure ring 22 via the anti-deformation member 40. Therefore, even if the flange 11 deforms and tilts in the direction of the axis Ac, the surface pressure on the sealing gasket G between the flange 11 and the pressure ring 22 can be ensured by correcting the deformation of the flange 11.

[0048] Furthermore, in this embodiment, the anti-deformation member 40 has a tapered portion 42, the dimension of which in the axial direction Ac gradually decreases from the radially outer side towards the inner side. According to the above structure, by adjusting the insertion amount of the tapered portion 42 relative to the gap S according to the axial direction Ac dimension of the gap S between the flange 11 and the pressure ring 22, the anti-deformation member 40 can be configured in gaps of various sizes S. In particular, the thermal deformation of the flange 11 mostly occurs unevenly in the circumferential direction. According to the above structure, even in the event of such uneven thermal deformation, the surface pressure of the sealing gasket G can be ensured similarly by changing the insertion amount of the tapered portion 42.

[0049] Furthermore, in this embodiment, a notch 22R is formed in the radially outer region of the opposing surface 22S. This notch 22R is recessed in the direction of the axis Ac and extends circumferentially. According to this structure, since the notch 22R is formed on the pressure ring 22, the anti-deformation member 40 can be inserted more smoothly. In addition, compared to the case where the notch 22R is not formed, the insertion depth of the anti-deformation member 40 can be increased, thereby reducing the possibility of the anti-deformation member 40 falling off.

[0050] Furthermore, in this embodiment, multiple anti-deformation members 40 are provided at intervals in the circumferential direction. A wire W is inserted through these multiple anti-deformation members 40. According to the above structure, because multiple anti-deformation members 40 are provided at intervals in the circumferential direction, the surface pressure distribution of the circumferential sealing gasket G can be made uniform. Furthermore, because these multiple anti-deformation members 40 are connected by the wire W, the detachment of the anti-deformation members 40 can be suppressed. Moreover, since the anti-deformation members 40 are also thermally connected to each other via the wire W, the distribution of heat input from the exhaust gas in the circumferential direction is balanced. Therefore, the amount of thermal expansion generated by the pipe body 10 can be made uniform in the circumferential direction.

[0051] Furthermore, in this embodiment, the anti-deformation components 40 are respectively provided at positions circumferentially aligned with the connecting components 30. According to the above structure, because the anti-deformation components 40 are provided at locations where the tightening force of the connecting components 30 is concentrated, the tightening force can be dispersed in both the circumferential and radial directions by the anti-deformation components 40. This further reduces the possibility of deformation of the flange 11.

[0052] The first embodiment of this disclosure has been described above. It should be noted that various changes and modifications can be made to the above structures as long as they do not depart from the spirit of this disclosure.

[0053] For example, it can also be used Figure 5 The structure shown is a variation. In the example shown, the outer peripheral edge of the sealing gasket G (sealing gasket edge Gt') extends radially to the same position as the outer peripheral edge of the flange 11. Additionally, the outer peripheral edge of the edge portion 21A (edge ​​portion edge 21t') also extends radially to the same position as the outer peripheral edge of the flange 11. That is, the sealing gasket G and the edge portion 21A cover the entire surface of the flange opposing surface 11S. Thus, the portion of the sealing gasket G closer to the outer peripheral side of the mating member 30 and the portion of the edge portion 21A closer to the outer peripheral side of the mating member 30 constitute the anti-deformation member 40b.

[0054] According to the above structure, the sealing gasket G covers the entire surface of the flange 11. Furthermore, the radially outer (outer peripheral) portion of the sealing gasket G functions as an anti-deformation member 40. Thus, similar to the first embodiment described above, surface pressure on the sealing gasket G can be ensured. Furthermore, according to the above structure, since the sealing gasket G and a portion of the edge portion 21A constitute the anti-deformation member 40b, the number of parts can be reduced, thereby lowering the manufacturing and maintenance costs of the exhaust pipe 90.

[0055] Alternatively, it can also be used Figure 6 The structure shown is another variation. In the example shown in the same figure, the sealing gasket edge Gt is located on the inner circumferential side compared to the connecting member 30. The edge edge 21t' is also located on the inner circumferential side compared to the connecting member 30. With this structure, it is also possible to obtain a structure similar to... Figure 5 The modified example has the same effect. It should be noted that in... Figure 6 In this example, the edge 21t' is folded back radially. Furthermore, since it is not necessary to form a hole in the sealing gasket G for inserting the bolt that serves as the connecting member 30, the possibility of exhaust gas leakage through this hole can be further reduced.

[0056] <Second Implementation Method>

[0057] Next, refer to Figure 7The second embodiment of this disclosure will now be described. It should be noted that structures identical to those in the first embodiment and its variations are labeled with the same reference numerals, and detailed descriptions are omitted.

[0058] In this embodiment, a tube P is provided around the bolt, which serves as the connecting member 30, covering the bolt from the outer periphery. That is, the diameter of the bolt insertion hole formed in the flange 11 and the pressure ring 22 is larger than in the first embodiment. Furthermore, the tube P extends in the axial direction Ac by the sum of the thicknesses of the flange 11, the sealing gasket G, the edge portion 21A, and the pressure ring 22. It should be noted that this sum is a value predetermined during design, representing the condition where the flange 11 does not undergo the aforementioned thermal deformation. The tube P constitutes an anti-deformation member 40c.

[0059] According to the above structure, when tightening the bolt, the tightening amount of the bolt is limited by the tube P, which acts as an anti-deformation component 40c. Specifically, the tube P extends to the sum of the thicknesses of the flange 11, the sealing gasket G, the edge portion 21A, and the pressure ring 22. The rigidity of the tube P in the axial direction Ac prevents the bolt from being tightened beyond this sum of thicknesses. Therefore, over-tightening of the bolt can be avoided, preventing deformation of the flange 11. As a result, surface pressure on the sealing gasket G can be ensured.

[0060] The various embodiments of this disclosure have been described above. It should be noted that various changes and modifications can be made to the above structures without departing from the spirit of this disclosure. For example, in the above embodiments, the structure of the exhaust pipe 90 was described using a marine engine 100 as an example. However, the application of the exhaust pipe 90 is not limited to marine engines; it can also be used in engines of other transportation machinery or power generation equipment.

[0061] Furthermore, in the above embodiments, an example was described where 12 bolts and nuts, serving as connecting components 30, are arranged circumferentially. However, the number of bolts and nuts is not limited to 12 and can be appropriately varied according to design and specifications.

[0062] Furthermore, in the above embodiment, an example of the sealing gasket G being formed of SUS was described. However, the material of the sealing gasket G is not limited to SUS, and it may also be formed of a heat-resistant resin or ceramic.

[0063] Alternatively, the anti-deformation components 40, 40b, and 40c described in the above embodiments and their variations can be combined and applied.

[0064] <Postscript>

[0065] The exhaust pipe 90 and engine 100 described in each embodiment are as follows.

[0066] (1) A first aspect provides an exhaust pipe 90 comprising: a plurality of pipe bodies 10 formed in a cylindrical shape about an axis Ac and arranged along the axis Ac, through which exhaust gas discharged from an engine body 1 flows; a connecting portion 20 connecting a pair of adjacent pipe bodies 10 in the aforementioned axis Ac direction; and a sealing gasket G disposed between the pipe bodies 10 and the connecting portion 20, wherein a flange 1 extending toward the outer periphery is provided at the end of the pipe body 10 in the aforementioned axis Ac direction. 1. The connecting part 20 has: a connecting part body 21, which is cylindrical about the axis Ac; a pressure ring 22, which has a facing surface 22S, which faces the flange 11 in a state where the sealing gasket G is sandwiched in the gap S between the pressure ring 22 and the flange 11; the exhaust pipe 90 also has: a connecting member 30, which is provided at intervals in the circumferential direction to connect the flange 11 and the pressure ring 22; and an anti-deformation member 40, which is provided in the area on the outer periphery of the gap S.

[0067] According to the above structure, an anti-deformation member 40 is provided in the region on the outer periphery of the gap S formed between the flange 11 and the pressure ring 22. Thus, even if the flange 11 deforms and tilts in the direction of the axis Ac, for example, the surface pressure on the sealing gasket G between the flange 11 and the pressure ring 22 can be ensured by intervening the anti-deformation member 40.

[0068] (2) In the exhaust pipe 90 of the second aspect, the aforementioned anti-deformation component 40 may have a tapered portion 42, the size of the tapered portion 42 in the direction of the aforementioned axis Ac gradually decreases from the radially outer side to the inner side.

[0069] According to the above structure, by adjusting the insertion amount of the tapered part 42 relative to the gap S according to the axial Ac direction dimension of the gap S between the flange 11 and the pressure ring 22, the anti-deformation component 40 can be configured in gaps of various sizes.

[0070] (3) In the exhaust pipe 90 of the third aspect, a cutout 22R may be formed in the region radially outside the opposing surface 22S, the cutout 22R being recessed in the direction of the axis Ac and extending circumferentially.

[0071] According to the above structure, because a notch 22R is formed on the pressure ring 22, the anti-deformation component 40 can be inserted more smoothly.

[0072] (4) In the exhaust pipe 90 of the fourth aspect, there may be a plurality of the above-mentioned anti-deformation components 40 spaced apart in the circumferential direction, and there is also a line W connecting the plurality of anti-deformation components 40 to each other.

[0073] According to the above structure, because multiple anti-deformation components 40 are spaced apart in the circumferential direction, the distribution of surface pressure in the circumferential direction can be made uniform. Furthermore, because these multiple anti-deformation components 40 are connected by wires W, the detachment of the anti-deformation components 40 can be prevented. Moreover, because the anti-deformation components 40 are also thermally connected to each other via wires W, the distribution of heat input in the circumferential direction is balanced. As a result, the amount of thermal expansion generated on the tube body 10 can be made uniform in the circumferential direction.

[0074] (5) In the exhaust pipe 90 of the fifth aspect, the above-mentioned anti-deformation components 40 may be respectively provided at the position that is consistent with the above-mentioned connecting component 30 in the circumferential direction.

[0075] According to the above structure, since an anti-deformation component 40 is provided at the location where the tightening force of the connecting component 30 is concentrated, the tightening force can be dispersed by the anti-deformation component 40. As a result, the possibility of deformation of the flange 11 can be reduced.

[0076] (6) In the exhaust pipe 90 of the sixth aspect, the sealing gasket G may be formed in an annular shape covering the entire surface of the flange 11, and the annular portion of the sealing gasket G on the radially outer side forms the anti-deformation member 40b.

[0077] According to the above structure, the sealing gasket G covers the entire surface of the flange 11. Furthermore, the radially outer portion of the sealing gasket G functions as an anti-deformation component 40b. This reduces the number of parts and lowers the manufacturing and maintenance costs of the exhaust pipe 90.

[0078] (7) In the exhaust pipe 90 of the seventh aspect, the connecting part 20 may have: a telescopic part 21C that can telescopically extend along the axis Ac; an edge part 21A that is provided at the end of the telescopic part 21C and extends outward to the outer periphery, and the annular portion of the radially outer side of the edge part 21A forms the anti-deformation member 40b.

[0079] According to the above structure, the radially outer portion of the edge 21A functions as an anti-deformation component 40b. This reduces the number of parts and lowers the manufacturing and maintenance costs of the exhaust pipe 90.

[0080] (8) In the exhaust pipe 90 of the eighth aspect, through holes extending along the axis Ac may be formed on the flange 11 and the pressure ring 22 respectively. The connecting member 30 has a bolt inserted into the through hole and a nut fastened to the bolt. The anti-deformation member 40c is a pipe P inserted into the through hole, covering the bolt from the outer periphery, and extending a predetermined amount along the axis Ac.

[0081] According to the above structure, the tightening amount of the bolt is limited by the tube P when tightening the bolt. This prevents over-tightening of the bolt and avoids deformation of the flange 11.

[0082] (9) A ninth aspect provides an engine 100 comprising: an exhaust pipe 90; and an engine body 1 having a combustion chamber 2 for sending the exhaust gas into the exhaust pipe 90.

[0083] Based on the above structure, an engine 100 can be provided that has an exhaust pipe 90 that further reduces exhaust gas leakage.

[0084] Industrial availability

[0085] According to this disclosure, an exhaust pipe and engine that can further reduce exhaust gas leakage can be provided.

[0086] Explanation of reference numerals in the attached figures

[0087] 100 engine

[0088] 90 exhaust pipe

[0089] 1 Engine body

[0090] 2 Combustion Chamber

[0091] 2A branch pipe

[0092] 10 main pipes

[0093] 11 Flange

[0094] 11S flange opposing surfaces

[0095] 20 Connecting parts

[0096] 21. Main body of the connecting part

[0097] 21A Edge

[0098] 21B Parallel section

[0099] 21C Telescopic section

[0100] 21t, 21t' edge

[0101] 22 Pressure Ring

[0102] 22R incision

[0103] 22S Opposite Plane

[0104] 22T inner perimeter

[0105] 30 Connecting components

[0106] 40, 40b, 40c Anti-deformation components

[0107] 41 Base

[0108] 42. Conical part

[0109] 42S conical surface

[0110] Ac axis

[0111] G sealing gasket

[0112] Gt, Gt' sealing gasket edge

[0113] H through hole

[0114] P tube

[0115] W line

Claims

1. An exhaust pipe, characterized in that, have: Multiple tube bodies are formed into a cylindrical shape centered on an axis and arranged along the axial direction, through which exhaust gas from the engine body flows; A connecting part that connects a pair of adjacent tube bodies in the axial direction; A sealing gasket is disposed between the tube body and the connecting portion. A flange extending outward toward the outer periphery is provided at the end of the tube body in the axial direction. The connecting part has: a connecting part body, which is cylindrical about the axis; A pressure ring having opposing surfaces, the opposing surfaces being positioned opposite the flange such that the sealing gasket is sandwiched between the pressure ring and the flange. The exhaust pipe also includes: a coupling component, which is spaced apart in the circumferential direction, for coupling the flange and the pressure ring; An anti-deformation component is disposed in the region on the outer periphery of the gap. The deformation-resistant component has a tapered portion. The axial dimension of the tapered portion gradually decreases as it moves from the radially outer side toward the inner side.

2. The exhaust pipe according to claim 1, wherein, A cut is formed in the region radially outward of the opposing surface, the cut being recessed toward the axis and extending circumferentially.

3. The exhaust pipe according to claim 1, wherein, The anti-deformation components are arranged in multiple circumferentially spaced apart. It also has a line that connects these multiple anti-deformation components to each other.

4. The exhaust pipe according to any one of claims 1 to 3, wherein, The anti-deformation components are respectively disposed at positions that are consistent with the connecting components in the circumferential direction.

5. The exhaust pipe according to any one of claims 1 to 3, wherein, The connecting portion has: A telescopic part that can extend and retract along the axis; The edge portion, which is located at the end of the telescopic portion, extends outward to the outer periphery. The end edge of the edge portion is located on the inner circumferential side compared to the connecting member, the end edge of the edge portion is folded back in the radial direction, and the annular portion on the radially outer side of the edge portion forms another anti-deformation member.

6. The exhaust pipe according to any one of claims 1 to 3, wherein, Through holes extending along the axial direction are formed on the flange and the pressure ring, respectively. The connecting component has: A bolt inserted into the through hole and a nut fastened to the bolt. Another anti-deformation component is a tube inserted through the through hole, covering the bolt from the outer periphery, and extending a predetermined amount along the axial direction.

7. An engine, characterized in that, have: The exhaust pipe according to any one of claims 1 to 6; The engine body has a combustion chamber that sends the exhaust gas into the exhaust pipe.

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