JP2019218929A - Exhaust pipe structure - Google Patents

Abstract

To inhibit infiltration of water into an exhaust pipe and an increase in exhaust pressure by using a simple configuration.SOLUTION: An exhaust pipe structure 1 includes: a cylindrical exhaust pipe 2 having two pipes 3, 4 which are coupled to each other by fastening flanges 3f, 4f thereof to each other by bolts; and a blocking wall 6 provided integrally with a plate member 7 nipped between the flanges 3f, 4f. The exhaust pipe 2 is used for discharging exhaust gas of an engine mounted on a vehicle to outside of the vehicle. The blocking wall 6 is protruded from an inner wall surface 2c of the exhaust pipe 2 toward the inner side and downstream side.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an exhaust pipe structure for suppressing intrusion of water into an exhaust pipe provided in a vehicle.

  2. Description of the Related Art Various sensors for detecting components of exhaust gas are attached to an exhaust pipe of a vehicle that discharges exhaust gas from an engine to the outside. Conventionally, in order to prevent such a sensor from being wet by water, it has been an issue to suppress water from entering the exhaust pipe.

  To cope with this problem, Patent Literature 1 discloses an inner peripheral surface of a curved portion of a tail pipe (exhaust pipe) outside in a bending direction, and a partition wall provided so as to be gradually separated from the inner peripheral surface toward the downstream side. And a structure defining a dead end is described. According to this structure, even when washing water enters from the outlet of the tail pipe at the time of high-pressure washing of the vehicle body, the washing water hits the above-mentioned blind alley portion and is blocked, and the splash is also bounced back to the partition wall, so that the tail pipe is washed to a deep position. It is said that water can be prevented from entering.

Japanese Patent Application Laid-Open No. 2006-138457

  However, in the structure described in Patent Literature 1, the exhaust pipe is formed so as to bulge outward in the bending direction in order to form the above-described blind lane while securing the flow passage area of the exhaust. For this reason, the shape of the exhaust pipe becomes complicated, which may lead to a decrease in layout properties and an increase in manufacturing cost. On the other hand, if a general cylindrical exhaust pipe that does not bulge is adopted, and if any configuration that suppresses the intrusion of water into the exhaust pipe is added, the flow of exhaust gas is not obstructed. It is required to suppress an increase in exhaust pressure.

  The exhaust pipe structure of the present invention has been made in view of the above-described problem, and has as its object to suppress water intrusion into the exhaust pipe and increase in exhaust pressure with a simple configuration.

  (1) The exhaust pipe structure disclosed herein has two pipes that are connected by bolting each other's flanges, and has a cylindrical shape that discharges exhaust of an engine mounted on a vehicle to the outside of the vehicle. And a shielding wall provided integrally with the plate member sandwiched between the flanges and protruding inward and downstream from the inner wall surface of the exhaust pipe. The “inside” here is the side toward the radial center of the exhaust pipe, and the “downstream side” here is based on the flow direction of the exhaust gas.

(2) A sensor having a tip protruding inward from the inner wall surface is attached to the exhaust pipe, and the shielding wall is disposed downstream of the sensor and viewed in a direction in which the exhaust pipe extends. Preferably, it overlaps the tip.
(3) It is preferable that the shielding wall protrudes inside the exhaust pipe from the tip.

(4) It is preferable that the shielding wall is formed in an arc shape extending along a circumferential direction of the inner wall surface.
(5) It is preferable that the shielding wall is formed in an annular shape extending along the circumferential direction of the inner wall surface.
(6) Preferably, the exhaust pipe extends so as to be inclined downward toward the downstream side. In this case, it is preferable that the lower part of the shielding wall is inclined downward toward the downstream side.

  According to the disclosed exhaust pipe structure, with a simple configuration in which a shielding wall protrudes inward and downstream from the inner wall surface of the cylindrical exhaust pipe, water infiltration into the exhaust pipe and an increase in exhaust pressure occur. Can be suppressed.

1 is a schematic configuration diagram of a vehicle to which an exhaust pipe structure according to a first embodiment is applied. FIG. 2 is a top view (an enlarged view of a portion X in FIG. 1) of the exhaust pipe structure of FIG. 1 and its periphery. FIG. 3 is a vertical cross-sectional view (a cross-sectional view taken along the line AA in FIG. 2) of the exhaust pipe structure of FIG. 2 and its periphery. FIG. 4 is a perspective view of a shielding wall applied to the exhaust pipe structure of FIG. 3. FIG. 4 is a diagram (a cross-sectional view taken along the line BB in FIG. 3) of the shielding wall of the exhaust pipe structure of FIG. It is a vertical sectional view (the figure corresponding to Drawing 3) of an exhaust pipe structure and its circumference concerning a second embodiment. FIG. 7 is a perspective view (a view corresponding to FIG. 4) of a shielding wall applied to the exhaust pipe structure of FIG. 6.

  An exhaust pipe structure as an embodiment will be described with reference to the drawings. The embodiments described below are merely examples, and there is no intention to exclude various modifications and application of techniques not explicitly described in the following embodiments. The configuration of each embodiment can be variously modified and implemented without departing from the spirit thereof. Further, they can be selected as needed, or can be appropriately combined.

[1. First Embodiment]
[1-1. Constitution]
As shown in FIG. 1, the exhaust pipe structure 1 is applied to a vehicle 10 on which an engine 11 is mounted. Here, a case where the vehicle 10 is a large vehicle such as a truck or a bus and the engine 11 is a diesel engine will be exemplified. Hereinafter, the front-rear direction and the left-right direction are determined based on the vehicle 10. Also, the direction of action of gravity is defined as downward, and the opposite direction is defined as upward. In the following description, it is assumed that the vehicle 10 is on a horizontal road surface.

  The vehicle 10 is provided with a pair of left and right side rails 12 extending in the front-rear direction as a frame structure for supporting various devices including the engine 11. The vehicle 10 includes a DPF muffler 13 containing a pre-stage oxidation catalyst and a filter, and an SCR muffler 14 containing a selective reduction catalyst and a post-stage oxidation catalyst as components for purifying exhaust gas (combustion gas) of the engine 11. Is arranged. Here, it is assumed that the DPF muffler 13 is disposed slightly to the left (inside in the left-right direction) of the right side rail 12 and the SCR muffler 14 is disposed to the right (outside in the left-right direction) of the right side rail 12. For example.

  As shown by a thick arrow in FIG. 1, the exhaust gas of the engine 11 is collected by an exhaust manifold 15 and then discharged to the outside of the vehicle 10 through a DPF muffler 13 and an SCR muffler 14 in order. Hereinafter, upstream and downstream are determined based on the flow direction of the exhaust gas.

  The exhaust pipe structure 1 includes an exhaust pipe 2 arranged downstream of the SCR muffler 14. The exhaust pipe 2 forms the most downstream portion of an exhaust passage provided in the vehicle 10 and discharges exhaust of the engine 11 to the outside of the vehicle 10. Here, a case where the exhaust pipe 2 has a shape that is gently curved in a C-shape will be exemplified. The exhaust pipe 2 is formed in a cylindrical shape, and the inner diameter thereof is made substantially uniform in the extending direction of the exhaust pipe 2 (flow direction of exhaust gas). That is, the cross section of the exhaust passage formed by the exhaust pipe 2 (a cross section orthogonal to the flow direction of exhaust gas) has a substantially uniform circular shape at any position in the flow direction of exhaust gas.

  As shown in FIG. 2, the exhaust pipe 2 of the present embodiment has two pipes 3 and 4 connected to each other. Hereinafter, of the two pipes 3 and 4, one pipe 3 connected to the SCR muffler 14 is also referred to as “SCR outlet pipe 3”, and the other pipe 4 is also referred to as “tail pipe 4”.

  The SCR outlet pipe 3 has a shape that gradually extends rightward after extending forward from an outlet formed at the front end 14a of the SCR muffler 14. A flange 3f extending radially outward is formed at the downstream end 3a of the SCR outlet pipe 3. On the other hand, the tail pipe 4 has a shape that extends rightward from the downstream end 3a of the SCR outlet pipe 3 and then gradually curves rearward. A flange 4f extending outward in the radial direction is formed at the upstream end 4b of the tail pipe 4. Further, the downstream end 4a of the tail pipe 4 is open to the outside at an oblique right front of the SCR muffler 14.

  As shown in FIG. 3, the pipes 3 and 4 are arranged such that the flanges 3f and 4f thereof face each other with a plate member 7 described later interposed therebetween. The pipes 3 and 4 are connected to each other by bolts 16 being inserted into through holes (not shown) formed in the flanges 3f and 4f and being fastened to the nut 17. As described above, the two pipes 3 and 4 are connected via the plate member 7 by being bolted with the flanges 3f and 4f of the respective members sandwiching the plate member 7. Here, an example is shown in which each of the flanges 3f, 4f has a substantially square shape, and the pipes 3, 4 are connected by four bolts 16 arranged at the four corners.

  Hereinafter, the side toward the radial center of the exhaust pipe 2 is referred to as “inside”, and the opposite side is referred to as “outside”. Since the pipes 3 and 4 are part of the exhaust pipe 2, the inner wall 3 c of the SCR outlet pipe 3 and the inner wall 4 c of the tail pipe 4 are respectively connected to the inner wall 2 c of the exhaust pipe 2. Part. The inner wall surface 3c of the SCR outlet pipe 3 and the inner wall surface 4c of the tail pipe 4 smoothly continue via the plate member 7 in a state where the pipes 3 and 4 are connected as described above.

  The exhaust pipe 2 of the present embodiment extends so as to be inclined downward toward the downstream side. In other words, the height position of the exhaust pipe 2 becomes lower toward the downstream side. Therefore, in the exhaust pipe 2, the height position of the upstream end 3 b of the SCR outlet pipe 3 is the highest, and the height position of the downstream end 4 a of the tail pipe 4 is the lowest. Therefore, for example, even when water enters the exhaust pipe 2 from the downstream end 4a of the tail pipe 4 at the time of high-pressure washing of the vehicle 10, this water flows down the exhaust pipe 2 due to gravity and flows downstream of the exhaust pipe 2. Drained from

  A sensor 5 for detecting a component of exhaust gas is attached to the SCR outlet pipe 3. In the present embodiment, a sensor 5 that detects the concentration of PM (Particulate Matter; particulate matter) contained in exhaust gas is exemplified. The sensor 5 is formed in a substantially columnar shape, and is inserted into and fixed to a mounting hole (not shown) formed in the SCR outlet pipe 3 from outside the SCR outlet pipe 3.

  The sensor 5 has a tip 5a protruding inward from the inner wall surface 3c of the SCR outlet pipe 3. A sensor element (not shown) formed of a material having high heat resistance (for example, ceramics) is provided at the distal end portion 5a. Note that a wiring (not shown) is connected to a connection end 5b of the sensor 5, which is an end opposite to the tip 5a.

  The sensor 5 of the present embodiment has a function of periodically regenerating by burning (removing) PM attached to the sensor element. The sensor 5 may fail if the tip portion 5a, which has been heated to a high temperature due to regeneration, is rapidly cooled by being wet. For this reason, the sensor 5 is attached to the SCR outlet pipe 3 in a posture in which its axis C is inclined downward from the connection end 5b side toward the tip end 5a side. In other words, the sensor 5 is attached to the upper half of the cross section of the SCR outlet pipe 3 (the cross section orthogonal to the extending direction of the SCR outlet pipe 3). Accordingly, when water flows downstream in the SCR outlet pipe 3 due to gravity, the tip 5a of the sensor 5 is less likely to be wet.

  The exhaust pipe structure 1 includes a shielding wall 6 as a configuration for suppressing water from entering the exhaust pipe 2. The shielding wall 6 is a thin plate-like wall for receiving water that has entered from the downstream end 4a of the tail pipe 4 toward the upstream side. The shielding wall 6 protrudes from the inner wall surface 2c of the exhaust pipe 2 toward the inside and downstream. That is, the shielding wall 6 is provided so as to be inclined with respect to the radial direction of the exhaust pipe 2 so that the protruding end (inner end) 6a faces the downstream side. The shielding wall 6 is arranged downstream of the sensor 5. The shielding wall 6 of the present embodiment is located below and to the right of the tip 5 a of the sensor 5 in the exhaust pipe 2.

  The shielding wall 6 is provided integrally with the plate member 7. That is, the shielding wall 6 is a part of the plate member 7 and is attached to the exhaust pipe 2 by the plate member 7 being sandwiched between the flanges 3f and 4f of the pipes 3 and 4.

  The plate member 7 is a member like a gasket sandwiched between the connecting portions of the pipes 3 and 4 as described above. As shown in FIG. 4, the plate member 7 includes a flat outer portion 7a sandwiched between the flanges 3f and 4f, a circular central hole 7b provided at the center of the outer portion 7a, and a central hole 7b. And a wall portion 7c protruding from the inner peripheral edge of the outer portion 7a so as to cover the portion.

  The outer portion 7a has a substantially square shape, and through holes 7h for inserting the bolts 16 are formed at four corners thereof. The center hole 7b is formed such that its diameter is the same as the inner diameter of the exhaust pipe 2. The wall portion 7c is a portion that functions as the above-described shielding wall 6, and is provided along a virtual conical surface having the central hole 7b as a bottom surface. When the plate member 7 is assembled to the exhaust pipe 2 as described above, the inner peripheral edge of the outer portion 7a is provided continuously with the inner wall surfaces 3c, 4c of the pipes 3, 4, and the central hole 7b is formed in the exhaust pipe 2 Is arranged inside (hollow portion). The plate member 7 is formed by, for example, pressing a steel plate.

  Hereinafter, the wall portion 7c (that is, the shielding wall 6) of the plate member 7 assembled to the exhaust pipe 2 will be described in detail. FIG. 5 is a view of the shielding wall 6 of the exhaust pipe structure 1 and its surroundings viewed from the downstream side toward the upstream side (in the extending direction of the exhaust pipe 2). As shown in FIG. 5, the shielding wall 6 of the present embodiment is formed in an arc shape extending along the circumferential direction of the inner wall surface 2c of the exhaust pipe 2. Here, the case where the shielding wall 6 is formed in a semicircular shape and is provided along the upper half of the inner wall surface 2c in the cross section of the exhaust pipe 2 (a cross section orthogonal to the extending direction of the exhaust pipe 2) is illustrated. I do.

  The shielding wall 6 of the present embodiment protrudes inside the exhaust pipe 2 beyond the tip 5 a of the sensor 5. In other words, based on the inner wall surface 2c of the exhaust pipe 2, the amount P1 of projection toward the inside of the shielding wall 6 is greater than the amount P2 of projection toward the inside of the tip 5a of the sensor 5 (P2 <P1). In addition, the shielding wall 6 of the present embodiment overlaps the entire distal end portion 5 a of the sensor 5 when viewed in the extending direction of the exhaust pipe 2. That is, when the exhaust pipe 2 is viewed from the downstream side toward the upstream side, the shielding wall 6 shields the entire distal end portion 5a.

[1-2. Action and effect]
In the exhaust pipe structure 1, a shielding wall 6 protrudes from the inner wall surface 2c of the cylindrical exhaust pipe 2 toward the inside and downstream. Therefore, for example, even when water enters the exhaust pipe 2 from the downstream end 4a of the tail pipe 4 at the time of high-pressure washing of the vehicle 10, the shielding wall 6 catches the water, so that the water flows upstream from the shielding wall 6. Water intrusion can be suppressed. Further, since the shielding wall 6 is formed to project obliquely inward from the inner wall surface 2c of the exhaust pipe 2 toward the downstream side, it is possible to make it difficult to obstruct the flow of exhaust gas. Thereby, an increase in exhaust pressure due to the addition of the shielding wall 6 can be suppressed.

  As described above, according to the exhaust pipe structure 1, with a simple configuration in which the shielding wall 6 is added to the cylindrical exhaust pipe 2, it is possible to suppress the invasion of water into the exhaust pipe 2 and the increase in exhaust pressure. it can. Therefore, since there is no need to make a design change such as making the exhaust pipe a bulged shape, it is possible to suppress a decrease in layout and an increase in manufacturing cost.

  The exhaust pipe 2 has two pipes 3 and 4 connected by bolting the flanges 3f and 4f to each other, and the shielding wall 6 is integrated with a plate member 7 sandwiched between the flanges 3f and 4f. Since it is provided, the shielding wall 6 can be easily assembled to the exhaust pipe 2. More specifically, the positioning and attachment of the shielding wall 6 to the exhaust pipe 2 can be completed only by holding the plate member 7 between the flanges 3f and 4f when connecting the two pipes 3 and 4. . Therefore, the assemblability of the shielding wall 6 can be improved.

  If the plate member 7 in which the shielding wall 6 is integrated is arranged at the connecting portion of the two pipes 3 and 4, the shielding wall 6 can be easily attached to the existing pipes 3 and 4. The pipes 3 and 4 can be shared between the case where the shielding wall 6 is provided and the case where it is not. Therefore, it is possible to contribute to a reduction in manufacturing cost.

  Since the shielding wall 6 is arranged downstream of the sensor 5 and overlaps with the tip 5a of the sensor 5 when viewed in the extending direction of the exhaust pipe 2 as shown in FIG. Can be made difficult. That is, even if water enters toward the upstream side of the exhaust pipe 2, the water is less likely to be applied to the tip 5 a of the sensor 5 because the shielding wall 6 catches the water before the tip 5 a of the sensor 5. . Therefore, it can contribute to protection of the sensor 5.

  Since the shielding wall 6 protrudes more inside the exhaust pipe 2 than the tip 5a of the sensor 5 (P2 <P1), water coming from the downstream side to the tip 5a of the sensor 5 is blocked. Can be easily received. Therefore, the tip 5a of the sensor 5 can be made harder to be wet.

  Since the shielding wall 6 is formed in an arc shape extending along the circumferential direction of the inner wall surface 2c of the exhaust pipe 2, it is easy to secure a cross-sectional area of the exhaust passage at the position where the shielding wall 6 is provided. In other words, by forming the shielding wall 6 into the above-described arc shape, the shielding wall 6 is not provided in a part of the inner wall surface 2c of the exhaust pipe 2 in the circumferential direction, so that it is difficult to obstruct the flow of exhaust gas. Can be. Therefore, an increase in the exhaust pressure can be further suppressed.

[2. Second embodiment]
[2-1. Constitution]
An exhaust pipe structure 1 'according to the second embodiment will be described with reference to FIGS. Here, the same reference numerals are given to the same or corresponding elements as the elements described in the first embodiment, and redundant description will be omitted.

  The exhaust pipe structure 1 ′ according to the present embodiment is different from the above-described exhaust pipe structure 1 in the shape of the shielding wall 6 ′. That is, as shown in FIG. 7, the plate member 7 'of the present embodiment has a wall 7c' having a shape different from the wall 7c of the first embodiment described above. The wall portion 7c 'of the present embodiment is also a portion functioning as a shielding wall 6', and is provided along a virtual conical surface having the central hole 7b as a bottom surface. The plate member 7 'of the present embodiment is also formed by, for example, pressing a steel plate.

  Hereinafter, the wall 7c '(that is, the shielding wall 6') of the plate member 7 'assembled to the exhaust pipe 2 will be described in detail. As shown in FIG. 6, the shielding wall 6 ′ of the present embodiment is formed in an annular shape extending along the circumferential direction of the inner wall surface 2 c of the exhaust pipe 2. That is, the shielding wall 6 ′ is provided along the entire circumference of the inner wall surface 2 c in the cross section of the exhaust pipe 2. Note that, also in the present embodiment, the shielding wall 6 ′ protrudes from the inner wall surface 2 c of the exhaust pipe 2 toward the inside and downstream, and is disposed downstream of the sensor 5. Further, the shielding wall 6 ′ protrudes inside the exhaust pipe 2 beyond the tip 5 a of the sensor 5, and overlaps the entire tip 5 a of the sensor 5 when viewed in the extending direction of the exhaust pipe 2.

  The lower part 6b of the shielding wall 6 'of this embodiment is inclined downward toward the downstream side. In other words, the lower portion 6b of the shielding wall 6 'is provided so as to be inclined so that the downstream side is lower than the horizontal line L indicated by the two-dot chain line in FIG. The lower part 6b here is a part (the part with the lowest height position) of the shielding wall 6 'which is arranged at the lowest side. More specifically, the lower portion 6b is a portion that forms the lower cross section of the upper and lower cross sections that appear in a C shape in a vertical cross section passing through the axis of the shielding wall 6 '(the cross section shown in FIG. 6). It is.

[2-2. Action and effect]
According to the exhaust pipe structure 1 'of the present embodiment, since the shielding wall 6' is formed in an annular shape extending along the circumferential direction of the inner wall surface 2c of the exhaust pipe 2, the arc-shaped shielding wall 6 is applied. This makes it easier to catch the water flowing toward the upstream side of the exhaust pipe 2 than in the case where Therefore, intrusion of water into the upstream side of the shielding wall 6 'can be suppressed more reliably. For this reason, when the shielding wall 6 ′ is disposed downstream of the sensor 5, the sensor 5 can be made harder to be wet.

  Further, in this embodiment, since the exhaust pipe 2 is extended so as to be inclined downward toward the downstream side, and the lower portion 6b of the shielding wall 6 'is inclined downwardly toward the downstream side, the water pipe 2 is provided with water. Even if the water enters the upstream side of the shielding wall 6 ', the water can flow smoothly to the downstream side by gravity. That is, since the lower portion 6b of the shielding wall 6 'is inclined downward toward the downstream side, the water flowing by gravity from the upstream side to the downstream side of the shielding wall 6' is blocked by the lower portion 6b of the shielding wall 6 '. It can be prevented from being stopped. Therefore, the drainage of the exhaust pipe 2 can be improved.

  Further, according to the exhaust pipe structure 1 'of the present embodiment, the same operation and effect can be obtained from the same configuration as that of the above-described first embodiment.

[3. Modification]
The shielding walls 6, 6 ′ need only project at least inward and downstream from the inner wall surface 2 c of the exhaust pipe 2, and the shape is not limited to the above-mentioned arc shape or annular shape. Further, the shielding walls 6 and 6 ′ do not need to protrude inside the exhaust pipe 2 beyond the tip 5 a of the sensor 5. That is, based on the inner wall surface 2 c of the exhaust pipe 2, the amount of protrusion toward the inside of the shielding walls 6, 6 ′ may be equal to or less than the amount of protrusion of the sensor 5 toward the inside of the tip 5 a.

  The above arrangement of the shielding walls 6, 6 'is an example. The shielding walls 6, 6 ′ may be provided at positions other than the connecting portion of the pipes 3, 4, and may not overlap with the tip 5 a of the sensor 5 when viewed in the extending direction of the exhaust pipe 2. However, if the shielding wall is arranged downstream of the sensor 5 and overlaps at least a part of the distal end portion 5a of the sensor 5 when viewed in the extending direction of the exhaust pipe 2, as described above, the upstream side of the exhaust pipe 2 The water that flows in toward the sensor 5 is easily received by the shielding wall just before the tip 5 a of the sensor 5. Therefore, the tip 5a of the sensor 5 can be made hard to be wet. Further, as in the above-described embodiments, if the shielding walls 6 and 6 ′ overlap the entire distal end portion 5 a of the sensor 5 when viewed in the extending direction of the exhaust pipe 2, the distal end portion 5 a of the sensor 5 is It can be hard to be wet.

  The semi-arc-shaped shielding wall 6 shown in the first embodiment may be provided so as to be shifted from the above-described position in the circumferential direction of the exhaust pipe 2. If such a semi-arc-shaped shielding wall is provided along the lower half of the inner wall surface 2c in the cross section of the exhaust pipe 2, the lower part of the shielding wall is formed as in the second embodiment described above. It is preferable to incline downward toward the downstream side. In this manner, similarly to the second embodiment, water flowing by gravity from the upstream side to the downstream side of the shielding wall can be prevented from being blocked by the lower part of the shielding wall. Can be increased.

  The plate members 7, 7 'provided integrally with the shielding walls 6, 6' may be sandwiched between the flanges 3f, 4f of the two pipes 3, 4 constituting the exhaust pipe 2, and the shape is as described above. The shape is not limited to this. The above-described materials and forming methods of the plate members 7, 7 'are all examples.

  The exhaust pipe 2 may further include a pipe other than the pipes 3 and 4 described above. The pipes 3 and 4 described above may be connected by bolting the flanges 3f and 4f to each other, and the shapes of the flanges 3f and 4f and the number of bolts 16 are not particularly limited. Further, the exhaust pipe 2 does not have to be inclined downward toward the downstream side. The lower part 6b of the shielding wall 6 'may not be inclined downward toward the downstream side. Even if water remains in the exhaust pipe 2, if the engine 11 operates and the exhaust flows through the exhaust pipe 2, the water in the exhaust pipe 2 is heated by the heat of the exhaust and evaporates. Is discharged to the outside of the vehicle 10.

  The mounting angle (the direction of the axis C with respect to the exhaust pipe 2) and the mounting position of the sensor 5 described above are all examples. Further, in each of the embodiments described above, the sensor 5 for detecting the concentration of PM is exemplified, but the type of the sensor 5 attached to the exhaust pipe 2 is not particularly limited. Furthermore, the sensor 5 may be omitted from the exhaust pipe structures 1, 1 '. Even when the sensor 5 is not provided, according to the exhaust pipe structure 1, 1 ', the shielding wall 6, 6' is protruded from the inner wall surface 2c of the exhaust pipe 2 as described above. In addition, it is possible to suppress the entry of water into the exhaust pipe 2 and an increase in exhaust pressure.

  The vehicle 10 is not limited to the large vehicle described above, and the engine 11 is not limited to a diesel engine. Further, the DPF muffler 13 and the SCR muffler 14 may be provided as appropriate according to the type of the engine 11, a part of the above-described catalyst and filter may be omitted, or a configuration other than the above-described catalyst and filter may be further provided. You may have.

1, 1 'exhaust pipe structure 2 exhaust pipe 2c inner wall surface 3 SCR outlet pipe (pipe)
3c Inner wall surface 3f Flange 4 Tail pipe (pipe)
4c Inner wall surface 4f Flange 5 Sensor 5a Tip 6, 6 'Shielding wall 6b Lower 7, 7' Plate member 10 Vehicle 11 Engine 16 Bolt

Claims (6)

A cylindrical exhaust pipe that has two pipes that are connected by bolting each other's flanges, and that discharges exhaust of an engine mounted on a vehicle to the outside of the vehicle,
A shielding wall provided integrally with the plate member sandwiched between the flanges and protruding inward from the inner wall surface of the exhaust pipe toward the downstream side. A sensor having a tip protruding inward from the inner wall surface is attached to the exhaust pipe,
2. The exhaust pipe structure according to claim 1, wherein the shielding wall is disposed downstream of the sensor, and overlaps the distal end when viewed in a direction in which the exhaust pipe extends. 3. The exhaust pipe structure according to claim 2, wherein the shielding wall protrudes inside the exhaust pipe from the tip. 4. The exhaust pipe structure according to claim 1, wherein the shielding wall is formed in an arc shape extending along a circumferential direction of the inner wall surface. 5. The exhaust pipe structure according to any one of claims 1 to 3, wherein the shielding wall is formed in an annular shape extending along a circumferential direction of the inner wall surface. The exhaust pipe is extended so as to be inclined downward toward the downstream side,
The exhaust pipe structure according to any one of claims 1 to 5, wherein a lower part of the shielding wall is inclined downward toward a downstream side.

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