JP2019178613A - Exhaust pipe structure - Google Patents

Abstract

To reduce temperature of exhaust in a simple structure.SOLUTION: A first device member 11 integrally comprises a first bottom plate part 14 having an approximately rectangular shape and a first side plate part 15 having a cylindrical shape, and the first bottom plate part 14 and the first side plate part 15 define a first space 16. The first space 16 is opened by a first opening 17. An exhaust outflow port 18 is formed in the first side plate part 15. A second device member 12 integrally comprises a second bottom plate part 20 having an approximately rectangular shape and a second side plate part 21 having a cylindrical shape, and the second bottom plate part 20 and the second side plate part 21 define a second space 22. The second space 22 is opened by a second opening 23. An exhaust inflow port 24 is formed in the second side plate part 21. A closing member 13 is fixed to the second device member 12 and closes the second opening 23. The second side plate part 21, the closing member 13, the first side plate part 15, and the first bottom plate part 14 out of an exhaust pipe 10 constitute an outer surface of the exhaust pipe 10 and are exposed to the outside.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to an exhaust pipe structure.

  Patent Document 1 describes a silencer for a general-purpose internal combustion engine. The silencer body is configured by joining two members, an upper body obliquely above and a lower body obliquely below. Inside the silencer body, there is provided a partition plate that defines the internal space of the silencer body. This partition plate is composed of an upper plate and a lower plate, and both plates are composed of a superposed portion that is superposed on each other and a concave portion formed inward from the superposed portion, with both concave portions of the upper plate and the lower plate facing each other. Thus, a hollow portion is formed, and the third expansion chamber is configured by the hollow portion. A small-diameter air hole is formed in the concave portion of the upper plate. The exhaust gas is introduced from the first expansion chamber on the lower body side to the second expansion chamber on the upper body side, and is introduced from the second expansion chamber to the third expansion chamber defined by the partition plate and is discharged from the exhaust port. The

JP 2000-8842 A

  By the way, since the exhaust gas from the internal combustion engine is very hot, the temperature of the exhaust gas is lowered before being exhausted from the exhaust pipe (while the exhaust pipe is circulating), and then the exhaust gas is exhausted to the outside of the vehicle. It is preferable to do. However, in the silencer described in Patent Document 1, the third expansion chamber through which the exhaust flows is formed by a recessed portion of a partition plate provided inside the silencer body, and is located upstream of the third expansion chamber. Since it is surrounded by the first expansion chamber and the second expansion chamber on the side (high temperature side), it is difficult to sufficiently cool the exhaust gas in the third expansion chamber.

  In addition, it is conceivable to lower the temperature of the exhaust gas while circulating the exhaust pipe by folding the exhaust pipe at a plurality of places to lengthen the exhaust flow path. There is a possibility that the structure of the exhaust pipe becomes complicated, for example, it is supported on the vehicle body side at a plurality of locations.

  Therefore, an object of the present disclosure is to provide an exhaust pipe structure that can reduce the temperature of exhaust gas with a simple structure.

  In order to solve the above problems, the exhaust pipe structure of the first aspect of the present invention includes a first device member, a second device member, and a closing member. The first container member includes a first bottom plate portion that intersects with a predetermined direction, a cylindrical first side plate portion that is integrally formed with the first bottom plate portion and extends from the outer peripheral edge of the first bottom plate portion to one side of the predetermined direction. The first side plate portion has a first opening that opens to the one side at the end portion on the one side, and divides the first space inside. The second container member is formed so as to cross the predetermined direction so as to close the first opening of the first container member, and the outer peripheral edge of the second bottom plate part is integrally formed with the second bottom plate part. A cylindrical second side plate extending from the one side to the one side, and a second opening opening to the one side at the end of the one side of the second side plate, and partitioning the second space inside, Fixed to the first vessel member. The closing member is fixed to the second device member so as to close the second opening of the second device member. A communication opening that communicates the first space of the first device member and the second space of the second device member is formed in the second bottom plate portion of the second device member. The first container member is formed with a first exhaust circulation port that allows inflow of exhaust into the first space or outflow of exhaust from the first space. The second side plate portion or the closing member of the second container member is formed with a second exhaust circulation port that allows the outflow of exhaust from the second space or the inflow of exhaust into the second space. The first vessel member and the second vessel member each have a region exposed to the outside.

  In the above configuration, the first device member and the second device member are fixed to each other so that the second bottom plate portion of the second device member serves as a partition between the first space and the second space, The second opening is closed with a closing member. The first device member is formed with a first exhaust circulation port that allows inflow of exhaust gas into the first space or outflow of exhaust gas from the first space, and the second bottom plate portion of the second device member has A communication opening that communicates the first space and the second space is formed, and the second side plate portion or the closing member of the second device member is configured to prevent the exhaust gas from flowing out of the second space or flowing into the second space. A permissible second exhaust circulation port is formed. For this reason, the exhaust gas flowing into the first space (or the second space) from the first exhaust flow port (or the second exhaust flow port) flows into the second space (or the first space) from the communication opening, and the second The gas is discharged from the exhaust circulation port (or the first exhaust circulation port). As described above, a long exhaust passage of the exhaust pipe can be secured with a simple structure in which two container members provided with a plurality of openings are fixed to each other and the closing member is fixed.

  The first container member and the second container member each have a region exposed to the outside. That is, since both the first device member and the second device member forming the exhaust flow path have a region exposed to the outside, the first exhaust flow port (or the second exhaust flow port) to the second exhaust flow port. The temperature of the exhaust can be lowered over the entire region in the flow direction of the exhaust flow path (or the first exhaust flow port).

  Therefore, the exhaust temperature can be lowered with a simple structure.

  In addition, what is necessary is to provide at least two container members (first container member and second container member), and may include three or more container members. For example, another vessel member may be provided on the other side of the first vessel member, and the first exhaust circulation port may be formed in the first bottom plate portion of the first vessel member.

  A second aspect of the present invention is the exhaust pipe structure according to the first aspect, wherein the first exhaust circulation port has substantially the same shape as the communication opening of the second bottom plate portion of the second device member. Formed on the first bottom plate of the member. The first vessel member and the second vessel member have substantially the same shape.

  In the said structure, since a 1st vessel member and a 2nd vessel member are substantially the same shape, manufacturing cost can be reduced.

  The exhaust pipe structure of the third aspect of the present invention includes a first device member, a second device member, a first closing member, and a second closing member. The first container member includes a first bottom plate portion that intersects with a predetermined direction, a cylindrical first side plate portion that is integrally formed with the first bottom plate portion and extends from the outer peripheral edge of the first bottom plate portion to one side of the predetermined direction. The first side plate portion has a first opening that opens to the one side at the end portion on the one side, and divides the first space inside. The second container member is integrated with the second bottom plate part, and a second bottom plate part fixed to the first bottom plate part of the first container member in a surface contact state from the other side of the predetermined direction across the predetermined direction. A cylindrical second side plate portion that is molded and extends from the outer peripheral edge of the second bottom plate portion to the other side, and a second opening that opens to the other side at the other end portion of the second side plate portion. The second space is partitioned inside. The first closing member is disposed so as to close the first opening of the first device member and is fixed to the first device member. The second closing member is disposed so as to close the second opening of the second device member and is fixed to the second device member. A first communication opening penetrating in the predetermined direction is formed in the first bottom plate portion of the first container member. A second communication opening that penetrates in the predetermined direction and communicates with the first communication opening is formed in the second bottom plate portion of the second container member. The first communication opening and the second communication opening communicate the first space and the second space. The first side plate portion or the first closing member of the first container member is formed with a first exhaust circulation port that allows inflow of exhaust into the first space or outflow of exhaust from the first space. The second side plate portion or the second closing member of the second container member is formed with a second exhaust circulation port that allows the exhaust gas to flow out of the second space or the exhaust gas to flow into the second space. The first side plate portion of the first device member and the second side plate portion of the second device member each have a region exposed to the outside.

  In the above configuration, the first bottom plate portion of the first device member and the second bottom plate portion of the second device member are fixed in surface contact with each other. The first bottom plate portion and the second bottom plate portion have the first space and the first bottom plate portion. A communication opening (a first communication opening and a second communication opening) that communicates with the two spaces is formed, the first closing member closes the first opening of the first device member, and the second closing member becomes the second device. The second opening of the member is closed. The first side plate portion or the first closing member of the first container member is formed with a first exhaust circulation port that allows inflow of exhaust into the first space or outflow of exhaust from the first space. The second side plate portion or the second closing member of the container member is formed with a second exhaust circulation port that allows the exhaust gas to flow out of the second space or the exhaust gas to flow into the second space. For this reason, the exhaust gas flowing into the first space (or the second space) from the first exhaust flow port (or the second exhaust flow port) flows into the second space (or the first space) from the communication opening, and the second The gas is discharged from the exhaust circulation port (or the first exhaust circulation port). As described above, a long exhaust passage of the exhaust pipe can be secured with a simple structure in which two container members provided with a plurality of openings are fixed to each other and the closing member is fixed.

  Further, the first side plate portion of the first device member and the second side plate portion of the second device member each have a region exposed to the outside. That is, since both the first device member and the second device member forming the exhaust flow path have a region exposed to the outside, the first exhaust flow port (or the second exhaust flow port) to the second exhaust flow port. The temperature of the exhaust can be lowered over the entire region in the flow direction of the exhaust flow path (or the first exhaust flow port).

  Therefore, the exhaust temperature can be lowered with a simple structure.

  A fourth aspect of the present invention is the exhaust pipe structure of the third aspect, wherein the first device member and the second device member have substantially the same shape and are symmetrical to each other in the predetermined direction. It is fixed with.

  In the above configuration, the first device member and the second device member have substantially the same shape and are fixed in a state of being symmetrical with each other in the predetermined direction. Thus, since the 1st vessel member and the 2nd vessel member can be made into the vessel member of the same shape, manufacturing cost can be reduced.

  According to the present disclosure, the temperature of the exhaust can be lowered with a simple structure.

1 is a schematic perspective view of an exhaust pipe to which an exhaust pipe structure according to a first embodiment of the present invention is applied. It is an exploded view of the exhaust pipe of FIG. It is a schematic perspective view of the exhaust pipe to which the exhaust pipe structure which concerns on other embodiment is applied. It is a schematic perspective view of the exhaust pipe to which the exhaust pipe structure which concerns on 2nd Embodiment of this invention is applied. It is an exploded view of the exhaust pipe of FIG.

  Hereinafter, an exhaust pipe structure according to the present disclosure will be described based on the drawings. In the following description, the vertical direction corresponds to the vertical direction of FIGS.

  As shown in FIGS. 1 and 2, the exhaust pipe structure according to the first embodiment of the present invention is, for example, a part of the exhaust pipe extending from the engine of a vehicle between the base end on the engine side and the tip. This is applied to the structure of the exhaust pipe 10 in the region.

  The exhaust pipe 10 has at least two or more vessel-like vessel members (in this embodiment, two vessel members 11 and 12) fixed in a state where they are stacked in a predetermined direction (in this embodiment, the vertical direction). And a closing member 13 for closing the opening of the vessel member. The predetermined direction is not limited to the vertical direction.

  The two vessel members 11 and 12 are composed of a first vessel member 11 arranged on the lower side (the other side in the predetermined direction) and a second vessel member 12 arranged on the upper side (one side in the predetermined direction). is there.

  The first vessel member 11 is a vessel-shaped member that is integrally formed by pressing or the like, and is formed along a substantially rectangular first bottom plate portion 14 that intersects the vertical direction, and a peripheral portion of the first bottom plate portion 14. It has a cylindrical first side plate portion 15 that stands up and extends upward. The first side plate portion 15 includes four side plate portions 15 a, 15 b, 15 c, and 15 d that extend in a substantially vertical direction with respect to the first bottom plate portion 14. The first bottom plate portion 14 and the first side plate portion 15 partition a space 16 (hereinafter referred to as a first space 16) inside the first container member 11. The first space 16 is moved upward by an opening 17 (hereinafter referred to as a first opening 17) at the upper end of the first side plate portion 15 in a state before the second device member 12 is fixed above the first device member 11. Opened. The area of the first opening 17 is slightly smaller than the area of the lower surface of the first bottom plate portion 14. An exhaust outlet (first exhaust circulation port) 18 that allows the exhaust gas to flow out from the first space 16 is formed in one side plate portion (for example, the side plate portion 15 a) of the first side plate portions 15. An exhaust pipe 19 on the exhaust downstream side (external side of the vehicle) from the exhaust pipe 10 communicates with the exhaust outlet 18.

  The second vessel member 12 is a vessel-like member that is integrally formed by pressing or the like, and is along a substantially rectangular second bottom plate portion 20 that intersects with the vertical direction, and a peripheral portion of the second bottom plate portion 20. It has a cylindrical second side plate portion 21 that stands up and extends upward, and is formed to be approximately the same size as the first device member 11. That is, the second bottom plate portion 20 of the second device member 12 has substantially the same shape and substantially the same size as the first bottom plate portion 14 of the first device member 11, and the second side plate portion 21 of the second device member 12 is The first side plate portion 15 of the first device member 11 has substantially the same shape and size. The second side plate portion 21 includes four side plate portions 21 a, 21 b, 21 c, and 21 d that extend in a substantially vertical direction with respect to the second bottom plate portion 20. The second bottom plate portion 20 and the second side plate portion 21 define a space 22 (hereinafter referred to as a second space 22) inside the second container member 12. The second space 22 is opened upward by an opening 23 (hereinafter referred to as a second opening 23) at the upper end of the second side plate portion 21 before the closing member 13 is fixed above the second device member 12. The The area of the second opening 23 is slightly smaller than the area of the lower surface of the second bottom plate portion 20. That is, the area of the lower surface of the second bottom plate portion 20 is slightly larger than the area of the first opening 17 of the first device member 11. An exhaust inflow port (second exhaust flow port) 24 that allows inflow of exhaust gas into the second space 22 is formed in one side plate portion (for example, the side plate portion 21 a) of the second side plate portions 21. The position of the exhaust inlet 24 with respect to the side plate portion 21 a is substantially the same as the position of the exhaust outlet 18 with respect to the side plate portion 15 a of the first device member 11, and the size of the exhaust inlet 24 is substantially the same as the exhaust outlet 18. It is a size. An exhaust pipe 25 on the exhaust upstream side (engine side) of the exhaust pipe 10 communicates with the exhaust inlet 24. A through-hole (communication opening) 26 penetrating the second bottom plate portion 20 in the vertical direction is formed in the vicinity of the side plate portion 21c facing the side plate portion 21a in the second bottom plate portion 20. The through hole 26 is a partial region of the second bottom plate portion 20. The through hole 26 is formed smaller than the first opening 17 of the first device member 11. The second bottom plate portion 20 of the second device member 12 is disposed so as to close the first opening 17 of the first device member 11, and the second device member 12 is overlapped with the first device member 11 from above. The second bottom plate portion 20 is fixed (for example, fixed by welding or the like) to the first side plate portion 15 of the first device member 11 in a state where the second device member 12 is overlapped with the first device member 11. The through-hole 26 communicates the first space 16 of the first device member 11 and the second space 22 of the second device member 12 with the first device member 11 and the second device member 12 fixed. Note that the second bottom plate portion 20 of the second device member 12 is disposed so as to close the first opening 17 of the first device member 11. The first opening 17 of the first device member 11 connects the through-hole 26. The first space 16 is in communication with the second space 22 through the through-hole 26 without being communicated with the outside by being blocked by the included second bottom plate portion 20.

  The blocking member 13 has a plate-like lid plate portion 13a that intersects with the vertical direction. The lid plate portion 13 a is formed larger than the second opening 23 of the second device member 12. The closing member 13 is fixed (for example, fixed by welding or the like) to the second device member 12 in a state where the cover plate portion 13a is disposed so as to close the second opening 23 of the second device member 12 from above. The

  The first instrument member 11 and the second instrument member 12 have openings (the exhaust outlet 18 or the exhaust inlet 24 and the through-hole 26) with respect to two identically shaped instrument members that are integrally formed by press working or the like. Manufactured by forming. That is, the first vessel member 11 is formed by forming the exhaust outlet 18 with respect to one of the two vessel-like members having the same shape, and the other vessel-like member. The second vessel member 12 is formed by forming the exhaust inlet 24 and the through-hole 26.

  Exhaust gas from the engine flows into the second space 22 of the second device member 12 from the exhaust pipe 25 on the exhaust upstream side via the exhaust inlet 24 of the exhaust pipe 10, and from the second space 22 to the second bottom plate portion 20. It flows into the first space 16 of the first device member 11 through the through-hole 26 and flows out from the first space 16 to the exhaust pipe 19 on the exhaust downstream side through the exhaust outlet 18. Among the exhaust pipes 10 that define the exhaust flow path from the exhaust inlet 24 to the exhaust outlet 18, the second side plate portion 21, the closing member 13, the first side plate portion 15, and the first bottom plate portion 14 include the exhaust pipe 10. The outer surface of the is constructed and exposed to the outside.

  In the exhaust pipe 10 configured as described above, two vessel members (first vessel member 11 and second vessel member 12) integrally formed by pressing or the like are fixed to each other, and the closure member is attached to the second vessel member 12. With a simple structure of fixing 13, a long exhaust passage from the exhaust inlet 24 to the exhaust outlet 18 of the exhaust pipe 10 can be secured.

  In the exhaust pipe 10 that defines the exhaust flow path from the exhaust inlet 24 to the exhaust outlet 18, the second side plate portion 21, the closing member 13, the first side plate portion 15, and the first bottom plate portion 14 are exhausted. It constitutes the outer surface of the tube 10 and is exposed to the outside. For this reason, the temperature of the exhaust gas can be lowered over the entire region in the flow direction of the exhaust passage from the exhaust inlet 24 to the exhaust outlet 18.

  Since the first instrument member 11 and the second instrument member 12 are formed from the same-shaped instrument member that is integrally formed by pressing or the like, compared to a case in which a plurality of plates are fixed to each other to form a box shape. Therefore, a simple structure with fewer work steps can be achieved.

  The first instrument member 11 and the second instrument member 12 have openings (the exhaust outlet 18 or the exhaust inlet 24 and the through-hole 26) with respect to the same-shaped instrument member that is integrally formed by pressing or the like. Manufactured by forming. That is, the first instrument member 11 and the second instrument member 12 can be formed from two identically shaped instrumental members that are integrally formed, so that the manufacturing cost can be reduced. Further, the position of the exhaust inlet 24 with respect to the side plate portion 21a of the second side plate portion 21 and the position of the exhaust outlet 18 with respect to the side plate portion 15a of the first device member 11 are substantially the same, and the exhaust inlet 24 and the exhaust gas are exhausted. The outlet 18 is substantially the same size. For this reason, manufacturing cost can be further reduced.

  Therefore, the exhaust temperature can be lowered with a simple structure.

  In the present embodiment, the second device member 12 side is the exhaust upstream side, and the first device member 11 side is the exhaust downstream side. However, the present invention is not limited to this, and the second device member 12 side is exhausted. The first device member 11 side may be the exhaust upstream side.

  Moreover, in this embodiment, although the exhaust inflow port (2nd exhaust flow port) 24 was formed in the 2nd instrument member 12 (side plate part 21a of the 2nd side plate part 21), it is not limited to this, The second exhaust circulation port may be formed in the closing member 13.

  In the present embodiment, the through hole (communication opening) 26 is formed in the vicinity of the side plate portion 21c facing the side plate portion 21a in the second bottom plate portion 20, but the position of the communication opening with respect to the second bottom plate portion 20 is It is not limited to this, and can be formed at a desired position.

  Moreover, in this embodiment, although the 1st instrument member 11 and the 2nd instrument member 12 were formed from the instrumental member of the same shape, the 1st instrument member 11 and the 2nd instrument member 12 are differently sized. You may form from a shaped member. For example, the second vessel member 12 may be formed from a larger vessel-like member than the first vessel member 11. Even in this case, the first vessel member 11 and the second vessel member 12 are formed from a vessel-shaped member integrally formed by press working or the like, so that a box-shaped exhaust pipe is secured by fixing a plurality of plates to each other. Compared with the case of forming 10, the number of work steps is small and a simple structure can be obtained.

  Moreover, in this embodiment, although the exhaust pipe 10 was provided with the two vessel members 11 and 12, what is necessary is just to have at least 2 vessel members (the 1st vessel member and the 2nd vessel member), and three or more. The container member may be provided.

  For example, as shown in FIG. 3, a first device member 31 having a shape different from that of the first device member 11 according to the first embodiment is disposed below the second device member 12 to which the closing member 13 is fixed. Another instrument member 32 may be disposed below the first instrument member 31. The first vessel member 31 is a vessel-shaped member that is integrally formed by pressing or the like, and is formed along a substantially rectangular first bottom plate portion 33 that intersects with the vertical direction and a peripheral portion of the first bottom plate portion 33. A cylindrical first side plate 34 that stands up and extends upward is integrally provided. The first bottom plate portion 33 and the first side plate portion 34 define a space 35 (hereinafter referred to as a first space 35) inside the first container member 31. The first space 35 is moved upward by an opening 36 (hereinafter referred to as a first opening 36) at the upper end of the first side plate portion 34 before the second device member 12 is fixed above the first device member 31. Opened. The first bottom plate portion 33 is formed with a through-hole (first exhaust circulation port) 37 penetrating in the vertical direction. The through-hole 37 is formed in a region of the first bottom plate portion 33 on the side of the exhaust inlet 24 of the second device member 12, and the exhaust gas flows out from the first space 35 (the space 38 inside the other device member 32. ). The position where the through-hole 37 is provided is not limited to the above.

  Next, 2nd Embodiment of this invention is described based on drawing. The exhaust pipe structure of the present embodiment is different from the first embodiment in that the bottom plate portions of the two vessel members are fixed to each other. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 4 and 5, the exhaust pipe structure according to the present embodiment is similar to the first embodiment, in the exhaust pipe extending from the engine of the vehicle, between the base end on the engine side to the front end. This is applied to the structure of the exhaust pipe 40 in some areas.

  The exhaust pipe 40 has at least two or more vessel-like vessel members (in this embodiment, two vessel members 41 and 42) fixed in a state where they are stacked in a predetermined direction (in this embodiment, the vertical direction). And two closing members 43 and 44 for closing the opening of the vessel member.

  The two vessel members 41 and 42 are a first vessel member 41 arranged on the lower side (the other side in the predetermined direction) and a second vessel member 42 arranged on the upper side (one side in the predetermined direction). is there. The two closing members 43 and 44 are a first closing member 43 fixed to the first device member 41 and a second closing member 44 fixed to the second device member 42.

  The first vessel member 41 is a vessel-shaped member that is integrally formed by pressing or the like, and is formed along a substantially rectangular first bottom plate portion 45 that intersects with the vertical direction and a peripheral portion of the first bottom plate portion 45. A cylindrical first side plate portion 46 that stands and extends downward is integrally provided. The first side plate portion 46 includes four side plate portions 46 a, 46 b, 46 c, 46 d that extend in a substantially vertical direction with respect to the first bottom plate portion 45. The first bottom plate portion 45 and the first side plate portion 46 define a space 47 (hereinafter referred to as a first space 47) inside the first container member 41. The first space 47 is lowered by an opening 48 (hereinafter referred to as a first opening 48) at the lower end of the first side plate portion 46 in a state before the first closing member 43 is fixed below the first device member 41. Opened. An exhaust outlet (first exhaust circulation port) 49 that allows the exhaust gas to flow out of the first space 47 is formed in one side plate portion (for example, the side plate portion 46 a) of the first side plate portions 46. The exhaust pipe 49 communicates with the exhaust outlet 49 on the exhaust downstream side (external side of the vehicle) with respect to the exhaust pipe 40. In the first bottom plate portion 45, a first through hole (first communication opening) 50 penetrating the first bottom plate portion 45 in the vertical direction is formed in the vicinity of the side plate portion 46 c facing the side plate portion 46 a. That is, the first through hole 50 is a partial region of the first bottom plate portion 45.

  The second vessel member 42 is a vessel-like member that is integrally formed by pressing or the like, and is along a substantially rectangular second bottom plate portion 51 that intersects with the vertical direction, and a peripheral portion of the second bottom plate portion 51. A cylindrical second side plate portion 52 that stands up and extends upward is formed integrally with the first container member 41. That is, the second bottom plate portion 51 of the second device member 42 has substantially the same shape and substantially the same size as the first bottom plate portion 45 of the first device member 41, and the second side plate portion 52 of the second device member 42 has The first side plate portion 46 of the first instrument member 41 has substantially the same shape and size. The second side plate portion 52 includes four side plate portions 52 a, 52 b, 52 c, 52 d that extend in a substantially vertical direction with respect to the second bottom plate portion 51. The second bottom plate portion 51 and the second side plate portion 52 define a space 53 (hereinafter referred to as a second space 53) inside the second container member 42. The second space 53 is moved upward by an opening 54 (hereinafter referred to as a second opening 54) at the upper end of the second side plate portion 52 before the second closing member 44 is fixed above the second container member 42. Opened. An exhaust inflow port (second exhaust circulation port) 55 that allows inflow of exhaust gas into the second space 54 is formed in one side plate portion (for example, the side plate portion 52 a) of the second side plate portions 52. The position of the exhaust inlet 55 with respect to the side plate portion 52 a is substantially the same as the position of the exhaust outlet 49 with respect to the side plate portion 46 a of the first device member 41, and the size of the exhaust inlet 55 is substantially the same as the exhaust outlet 49. It is a size. An exhaust pipe 25 on the exhaust upstream side (engine side) of the exhaust pipe 40 communicates with the exhaust inlet 55. In the second bottom plate portion 51, a second through hole (second communication opening) 56 that penetrates the second bottom plate portion 51 in the vertical direction is formed in the vicinity of the side plate portion 52 c facing the side plate portion 52 a. The second through hole 56 is a partial region of the second bottom plate portion 51. The second through hole 56 of the second bottom plate part 51 is disposed at a position facing the first through hole 50 of the first bottom plate part 45, and is formed in substantially the same size and shape as the first through hole 50. That is, the second instrument member 42 and the first instrument member 41 are symmetrical in the vertical direction (predetermined direction). The second device member 42 is in contact with the first device member 41 in a state where the lower surface of the second bottom plate portion 51 of the second device member 42 is in surface contact with the upper surface of the first bottom plate portion 45 of the first device member 41. It is fixed (for example, fixed by welding or the like). In a state in which the first device member 41 and the second device member 42 are fixed, the first through hole 50 of the first bottom plate portion 45 and the second through port 56 of the second bottom plate portion 51 overlap in the vertical direction. The first space 47 of the member 41 communicates with the second space 53 of the second container member 42.

  The first closing member 43 has a plate-like lid plate portion 43a that intersects with the vertical direction. The cover plate portion 43 a is formed larger than the first opening 48 of the first device member 41. The first closing member 43 is fixed to the first device member 41 (for example, fixed by welding or the like) in a state where the cover plate portion 43a is disposed so as to close the first opening 48 of the first device member 41 from below. )

  The second closing member 44 has a plate-like lid plate portion 44a that intersects with the vertical direction. The lid plate portion 44 a is formed larger than the second opening 54 of the second container member 42. The second closing member 44 is fixed to the second device member 42 (for example, fixed by welding or the like) in a state where the cover plate portion 44a is disposed so as to close the second opening 54 of the second device member 42 from above. )

  The first vessel member 41 and the second vessel member 42 are opened (exhaust outlet 49 and first through-hole 50 or exhaust inlet 55 with respect to two vessel-like members having the same shape which are integrally formed by pressing or the like. And the second through hole 56). That is, the first vessel member 41 is formed by forming the exhaust outlet 49 and the first through port 50 for one of the two vessel-like members having the same shape, and the other The second vessel member 42 is formed by forming the exhaust inlet 55 and the second through-hole 56 with respect to the vessel-like member.

  Exhaust gas from the engine flows into the second space 53 of the second device member 42 from the exhaust pipe 25 on the exhaust upstream side via the exhaust inlet 55 of the exhaust pipe 40, and from the second space 53 to the second bottom plate portion 51. It flows into the first space 47 of the first device member 41 through the second through-hole 56 and flows out from the first space 47 to the exhaust pipe 19 on the exhaust downstream side through the exhaust outlet 49. Of the exhaust pipe 40 that defines the exhaust flow path from the exhaust inlet 55 to the exhaust outlet 49, the second side plate portion 52, the second closing member 44, the first side plate portion 46, and the first closing member 43 are exhausted. It constitutes the outer surface of the tube 40 and is exposed to the outside.

  In the exhaust pipe 40 configured as described above, two container members (first instrument member 41 and second instrument member 42) integrally formed by press working or the like are fixed to each other, and the first instrument member 41 has a first To secure a long exhaust flow path from the exhaust inlet 55 to the exhaust outlet 49 of the exhaust pipe 40 with a simple structure in which the closing member 43 is fixed and the second closing member 44 is fixed to the second device member 42. Can do. Of the exhaust pipe 40 that defines the exhaust flow path from the exhaust inlet 55 to the exhaust outlet 49, the second side plate portion 52, the second closing member 44, the first side plate portion 46, and the first closing member 43 are exhausted. It constitutes the outer surface of the tube 40 and is exposed to the outside. For this reason, the temperature of the exhaust gas can be lowered over the entire region in the flow direction of the exhaust passage from the exhaust inlet 55 to the exhaust outlet 49.

  Further, since the second instrument member 42 and the first instrument member 41 have substantially the same shape and are fixed in a state of being symmetrical with each other in the vertical direction, the manufacturing cost can be reduced.

  Therefore, the exhaust temperature can be lowered with a simple structure.

  In the present embodiment, the second device member 42 side is the exhaust upstream side, and the first device member 41 side is the exhaust downstream side. However, the present invention is not limited to this, and the second device member 42 side is exhausted. The first device member 41 side may be the exhaust upstream side.

  Further, in the present embodiment, the exhaust outlet (first exhaust circulation port) 49 is provided in the side plate portion 46 a of the first device member 41, but the first exhaust circulation port is replaced with the first closing port instead of the exhaust outlet 49. You may provide in the cover board part 43a of the member 43 (refer the dashed-two dotted line 59 of FIG. 5).

  In the present embodiment, the side plate portion 52a of the second device member 42 is provided with the exhaust inflow port (second exhaust flow port) 55. However, the second exhaust flow port is replaced by the second blockage instead of the exhaust inflow port 55. You may provide in the cover board part 44a of the member 44 (refer the dashed-two dotted line 58 of FIG. 5).

  In the present embodiment, the first through hole (first communication opening) 50 is formed in the vicinity of the side plate portion 46 c facing the side plate portion 46 a of the first bottom plate portion 45, but the communication opening to the first bottom plate portion 45 is provided. The position of is not limited to this. Further, the position of the second through hole (second communication opening) 56 with respect to the second bottom plate portion 51 is not limited to the above. The first communication opening of the first bottom plate portion 45 and the second communication opening of the second bottom plate portion 51 can be provided at arbitrary positions.

  Moreover, in this embodiment, although the 1st instrument member 41 and the 2nd instrument member 42 were formed from the instrumental member of the same shape, the 1st instrument member 41 and the 2nd instrument member 42 are differently sized. You may form from a shaped member. Even in this case, the first vessel member 41 and the second vessel member 42 are formed from a vessel-shaped member integrally formed by pressing or the like, so that a box-shaped exhaust pipe is secured by fixing a plurality of plates to each other. Compared to the case of forming 40, the number of work steps is small and a simple structure can be obtained.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said embodiment, Of course, it can change suitably in the range which does not deviate from this invention. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The exhaust pipe structure according to the present invention can be widely applied to the structure of the exhaust pipe.

10, 40: Exhaust pipes 11, 31, 41: First vessel member 12, 42: Second vessel member 13: Closure members 14, 33, 45: First bottom plate portions 15, 34, 46: First side plate portion 16, 35, 47: first spaces 17, 36, 48: first openings 18, 49: exhaust outlet (first exhaust circulation port)
20, 51: second bottom plate portion 21, 52: second side plate portion 22, 53: second space 23, 54: second opening 24, 55: exhaust inlet (second exhaust circulation port)
26: Through-hole (communication opening)
37: Through-hole (first exhaust circulation port)
43: 1st closure member 44: 2nd closure member 50: 1st penetration port (1st communication opening)
56: Second through-hole (second communication opening)

Claims (4)

A first bottom plate that intersects with a predetermined direction; a cylindrical first side plate that is integrally formed with the first bottom plate and extends from an outer peripheral edge of the first bottom plate to the one side in the predetermined direction; A first opening member that has a first opening that opens to the one side at an end of the one side plate portion, and divides a first space inside;
A second bottom plate portion disposed so as to cross the predetermined direction so as to close the first opening of the first device member; and integrally formed with the second bottom plate portion, from the outer peripheral edge of the second bottom plate portion, A cylindrical second side plate portion extending to one side, and a second opening opening to the one side at the one end portion of the second side plate portion, partitioning a second space therein, A second vessel member fixed to the first vessel member;
A closing member fixed to the second vessel member so as to close the second opening of the second vessel member;
The second bottom plate portion of the second device member is formed with a communication opening that communicates the first space of the first device member and the second space of the second device member,
The first vessel member is formed with a first exhaust circulation port that allows inflow of exhaust into the first space or outflow of exhaust from the first space,
The second side plate portion or the closing member of the second vessel member is formed with a second exhaust circulation port that allows the outflow of exhaust from the second space or the inflow of exhaust into the second space,
The first vessel member and the second vessel member each have a region exposed to the outside. The exhaust pipe structure according to claim 1,
The first exhaust circulation port is formed in the first bottom plate portion of the first device member in substantially the same shape as the communication opening of the second bottom plate portion of the second device member,
The exhaust pipe structure, wherein the first device member and the second device member have substantially the same shape. A first bottom plate portion intersecting with a predetermined direction; a cylindrical first side plate portion integrally formed with the first bottom plate portion and extending from one outer periphery of the first bottom plate portion to one side in the predetermined direction; A first opening member that has a first opening that opens to the one side at an end of the one side plate portion, and divides a first space inside;
A second bottom plate portion that is fixed to the first bottom plate portion of the first container member in a state of being in surface contact from the other side of the predetermined direction, intersecting with the predetermined direction, and integrally formed with the second bottom plate portion. A cylindrical second side plate extending from the outer peripheral edge of the second bottom plate to the other side, and a second opening opening to the other side at the other side end of the second side plate, A second container member defining a second space inside;
A first closing member disposed so as to close the first opening of the first device member and fixed to the first device member;
A second closing member disposed so as to close the second opening of the second vessel member and fixed to the second vessel member;
A first communication opening penetrating in the predetermined direction is formed in the first bottom plate portion of the first vessel member,
The second bottom plate portion of the second container member is formed with a second communication opening penetrating in the predetermined direction and communicating with the first communication opening.
The first communication opening and the second communication opening communicate the first space and the second space,
The first side plate portion of the first container member or the first closing member is formed with a first exhaust circulation port that allows inflow of exhaust into the first space or outflow of exhaust from the first space. ,
The second side plate portion or the second closing member of the second container member is formed with a second exhaust circulation port that allows the exhaust gas to flow out from the second space or the exhaust gas into the second space. ,
The exhaust pipe structure, wherein the first side plate portion of the first device member and the second side plate portion of the second device member each have a region exposed to the outside. The exhaust pipe structure according to claim 3,
The exhaust pipe structure according to claim 1, wherein the first instrument member and the second instrument member have substantially the same shape and are fixed in a state of being symmetrical with each other in the predetermined direction.

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