Exhaust gas guide device

Abstract

To provide an exhaust gas guide device capable of suppressing thermal damage caused by exhaust gas.SOLUTION: An exhaust gas guide device that guides exhaust gas generated by an engine of a vehicle and discharged from a discharge port into the atmosphere includes a plate-shaped guide part curved downwardly while extending in the exhaust gas discharge direction to guide the exhaust gas downwardly. A side end part of the guide part includes a warping part that warps toward the discharge direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an exhaust gas guidance device. [Background technology]

[0002] The following Patent Document 1 discloses a vehicle equipped with an engine, a purification device, a silencer, a tailpipe, etc., in which exhaust gas generated by the engine flows through the purification device, the silencer, and the tailpipe in that order, and is discharged into the atmosphere. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-330828 A Summary of the Invention [Problem to be solved by the invention]

[0004] In such vehicles, in order to suppress thermal damage to people and the like caused by exhaust gases, an additional component may be provided in the tail pipe to direct the exhaust gases downward from the vehicle, i.e., toward the ground.

[0005] On the other hand, in this case, if the exhaust gas is discharged to the ground before it has time to diffuse widely, only a part of the ground will be exposed to the high-temperature exhaust gas, and that part of the ground may deteriorate. For example, if the ground is asphalt, the heat of the exhaust gas may melt the asphalt.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an exhaust gas guide device capable of suppressing thermal damage caused by exhaust gas. [Means for solving the problem]

[0007] The present invention has been made to solve at least some of the problems described above, and can be realized in the following aspects or application examples.

[0008] (1) The exhaust gas guiding device of this application example is an exhaust gas guiding device that guides exhaust gas generated in a vehicle engine and discharged into the atmosphere from an exhaust port, and includes a plate-shaped guiding portion that extends along the exhaust direction of the exhaust gas and curves downward to guide the exhaust gas downward, and a side end portion of the guiding portion includes a warped portion that is warped toward the exhaust direction of the exhaust gas.

[0009] According to this application example, the exhaust gas is guided toward the ground, and further, by utilizing the Karman vortex caused by the warped portion of the side end portion, the exhaust gas can be diffused in a fan shape in the discharge direction on a horizontal plane and flow toward the ground. Therefore, according to this application example, the radiation range of the exhaust gas toward the ground is expanded, and the amount of heat transferred from the exhaust gas per unit area of ​​the part of the ground exposed to the exhaust gas is reduced. Also, according to this application example, the exhaust gas is efficiently cooled by the Karman vortex. For these reasons, according to this application example, the exhaust gas can be guided toward the ground and thermal damage caused by the exhaust gas can be suppressed.

[0010] (2) In the exhaust gas guiding device according to the application example of (1) above, the guide portion includes a bulging portion that bulges out along the extending direction of the guide portion on the guide surface side that guides the exhaust gas.

[0011] According to the above configuration, since the guide portion has a bulge on the guide surface side that guides the exhaust gas, the exhaust gas is diffused along the bulge, and the exhaust gas can be easily guided to the side end portion. As a result, according to the above configuration, the proportion of the exhaust gas that is affected by the Karman vortex is increased, and the exhaust gas can be further expanded in the emission range and cooled.

[0012] (3) In an exhaust gas guidance device relating to the application example of (1) above, the bulge portion has a width at an end portion on a first side, which is the exhaust outlet side in the extension direction, that is larger than a width at an end portion on a second side, which is opposite the first side in the extension direction.

[0013] According to the above-described configuration, the width of the bulging portion is larger on the exhaust gas outlet side, so that the exhaust gas can be diffused at an early stage and guided to the side end side.

[0014] (4) In the exhaust gas guiding device according to the application example of (1) above, the exhaust direction is a direction away from the vehicle in a vehicle width direction of the vehicle, and the extension direction of the guiding portion includes the vehicle width direction.

[0015] According to the above configuration, exhaust gas can be smoothly guided toward the ground at the side of the vehicle.

[0016] (5) In the exhaust gas guiding device according to the application example of (1) above, the distance between the side ends increases from a first side, which is the exhaust outlet side in the extension direction of the guiding portion, to a second side, which is the opposite side to the first side in the extension direction.

[0017] According to the above configuration, the exhaust gas is diffused in a fan shape from the first side to the second side in the extension direction of the guide portion on the guide surface of the guide portion that guides the exhaust gas. In other words, according to the above configuration, the emission range of the exhaust gas is further expanded, and the thermal damage caused by the exhaust gas can be further suppressed. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic top view of a vehicle according to an embodiment of the present invention. [Diagram 2] 2 is a schematic enlarged top view of a portion of the vehicle 10 shown in FIG. [Diagram 3] 1 is a schematic side view of an exhaust gas guide device according to an embodiment of the present invention. [Figure 4] 1 is a schematic top view of an exhaust gas guide device according to an embodiment of the present invention; [Diagram 5] 1 is a schematic front view of an exhaust gas guide device according to an embodiment of the present invention; [Figure 6] 5 is a schematic end view showing an AA end face of the exhaust gas guiding device shown in FIGS. 3 and 4. FIG. [Figure 7] 5 is a schematic end view showing a BB end surface of the exhaust gas guide device shown in FIGS. 3 and 4. FIG. [Figure 8] 5 is a schematic end view showing a CC end face of the exhaust gas guide device shown in FIGS. 3 and 4. FIG. [Figure 9] FIG. 2 is a schematic end view conceptually illustrating horizontal diffusion of exhaust gas in this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 1. Vehicle configuration Fig. 1 is a schematic top view of a vehicle 10 according to the present embodiment. Fig. 2 is a schematic top view showing an enlarged view of a portion of the vehicle 10 shown in Fig. 1. Fig. 2 is a schematic top view showing an enlarged view of the periphery of a tail pipe 46, which will be described later. Hereinafter, the configuration of the vehicle 10 will be described with reference to Figs. 1 and 2.

[0020] In the following description, the vehicle length direction of the vehicle 10 may be referred to as the X direction or the front-rear direction. In the following description, the vehicle height direction of the vehicle 10 may be referred to as the Z direction, the up-down direction or the vertical direction. In the following description, the vehicle width direction of the vehicle 10 may be referred to as the Y direction or the left-right direction.

[0021] In the following description, the horizontal plane may be referred to as the XY plane. In the following description, the plane including the vehicle length direction and the vehicle height direction may be referred to as the XZ plane. In the following description, the plane including the vehicle width direction and the vehicle height direction may be referred to as the YZ plane.

[0022] Furthermore, in the following description, a pair of symmetrical configurations may be distinguished by adding an R to the reference numeral of the right-side component and an L to the reference numeral of the left-side component.

[0023] Furthermore, in the following description, the inside in any direction refers to the side closer to the center of the vehicle 10 in that direction, and the outside in any direction refers to the side farther from the center of the vehicle 10 in that direction.

[0024] The vehicle 10 is an engine-powered vehicle. Specifically, the vehicle 10 is an engine-powered truck. A body frame 20 of the vehicle 10 is, for example, a chassis frame of a ladder frame structure that is applied to large vehicles such as trucks.

[0025] The vehicle body frame 20 includes side rails 22 (22R, 22L) and a plurality of cross members 24. The side rails 22 extend in the vehicle length direction. The side rails 22R, 22L are parallel to each other and spaced apart from each other in the vehicle width direction.

[0026] The cross members 24 extend in the vehicle width direction and connect the side rails 22R, 22L. The cross members 24 connect, for example, the front ends, intermediate positions, and rear ends of the side rails 22R, 22L.

[0027] The body frame 20 supports various components of the vehicle 10. For example, a transmission mechanism (not shown) is supported at the front of the vehicle 10. This transmission mechanism supports a transmission mechanism (not shown) that transmits steering force from a steering wheel (not shown) to front wheels 28 (28R, 28L) via a steering shaft 26 or the like. The front wheels 28 are driven wheels, and are suspended from the body frame 20.

[0028] The vehicle 10 also has a drive system that includes an engine 30, a transmission 32, a propeller shaft 34, a differential 36, etc., which are supported by the vehicle body frame 20.

[0029] The engine 30 is a diesel engine that serves as a power source for propelling the vehicle 10. The driving force generated by the engine 30 is transmitted to rear wheels 40 (40R, 40L) via a transmission 32, a propeller shaft 34, a differential 36, and drive shafts 38 (38R, 38L), etc. In other words, the rear wheels 40 are drive wheels. The rear wheels 40 are suspended from the body frame 20.

[0030] The vehicle 10 also includes an exhaust gas aftertreatment system (ATS) 42. The ATS 42 is supported by the vehicle body frame 20. Specifically, the ATS 42 is supported on the outer side of the side rail 22R in the vehicle width direction.

[0031] In addition, the ATS 42 is connected to the engine 30 via a connecting pipe 44, and the exhaust gas generated by the engine 30 is supplied from the engine 30 to the ATS 42 via the connecting pipe 44. The exhaust gas generated by the engine 30 contains heat.

[0032] The ATS 42 purifies the exhaust gas supplied from the engine 30. The ATS 42 includes a diesel particulate filter (DPF) and a selective catalytic reduction (SCR) catalyst.

[0033] The ATS42 uses a DPF to capture particulate matter (PM) made up of carbon and other substances in the exhaust gas, and uses an SCR catalyst to remove NO X Harmless N 2 By reducing the carbon dioxide to the nitrogen, the exhaust gas supplied from the engine 30 is purified.

[0034] Furthermore, the vehicle 10 is equipped with a tail pipe 46. The tail pipe 46 is located outside the ATS 42 in the vehicle width direction and extends in the vehicle width direction. One end of the tail pipe 46 is connected to an exhaust gas outlet portion located outside the ATS 42 in the vehicle width direction. Therefore, exhaust gas purified by the ATS 42 is supplied from the ATS 42 to the tail pipe 46. The other end of the tail pipe 46 has an exhaust port 46a that discharges the exhaust gas into the atmosphere. The tail pipe 46 also serves as a muffler.

[0035] For these reasons, exhaust gas generated by the engine 30 is supplied to the ATS 42 via the connecting pipe 44, and the exhaust gas purified by the ATS 42 is discharged into the atmosphere from the exhaust port 46a of the tail pipe 46. Although not shown in Fig. 1, the exhaust direction D of the exhaust gas when it is discharged into the atmosphere from the exhaust port 46a is a direction away from the vehicle 10 in the vehicle width direction (to the right of the vehicle).

[0036] In addition to the above configuration, the vehicle 10 of the present embodiment is equipped with an exhaust gas guide device 48. The exhaust gas guide device 48 guides exhaust gas generated by the engine 30 and discharged into the atmosphere from an exhaust port 46a of the tailpipe 46 below the vehicle 10, i.e., toward the ground.

[0037] 2. Configuration of exhaust gas guidance device The exhaust gas guide device 48 of this embodiment will be described with reference to Figs. 1 and 2 as well as Figs. 3 to 8. Fig. 3 is a schematic side view of the exhaust gas guide device 48 of this embodiment. Fig. 3 is also a view of the exhaust gas guide device 48 as seen from the rear of the vehicle 10. Fig. 4 is a schematic top view of the exhaust gas guide device 48 of this embodiment. Fig. 5 is a schematic front view of the exhaust gas guide device 48 of this embodiment. Fig. 5 is also a view of the exhaust gas guide device 48 as seen from the right side of the vehicle 10. Fig. 6 is a schematic end view showing the AA end face of the exhaust gas guide device 48 shown in Figs. 3 and 4. Fig. 7 is a schematic end view showing the BB end face of the exhaust gas guide device 48 shown in Figs. 3 and 4. Fig. 8 is a schematic end view showing the CC end face of the exhaust gas guide device 48 shown in Figs. 3 and 4.

[0038] The exhaust gas guiding device 48 includes a guide portion 50 and the like. The guide portion 50 is a curved, plate-like member. The guide portion 50 extends from the upper end edge of the exhaust port 46a of the tailpipe 46 along the exhaust direction D of the exhaust gas, and curves downward of the vehicle 10 to guide the exhaust gas downward. The exhaust port 46a in this embodiment is a circular opening, and the base end portion of the guide portion 50 connected to the exhaust port 46a is semi-cylindrical.

[0039] As described above, the exhaust direction D of the exhaust gas is a direction away from the vehicle 10 in the vehicle width direction, so the extension direction E of the guide portion 50 is curved as shown in Fig. 3 and further includes the vehicle width direction. Therefore, the exhaust gas guiding device 48 can guide the exhaust gas toward the ground on the side of the vehicle 10.

[0040] Specifically, the guide portion 50 extends linearly from the discharge opening 46a to a position P1 along the discharge direction D, and then curves downward from the position P1 while continuing to extend along the discharge direction D. That is, the position P1 is the bending start position.

[0041] The guide portion 50 also includes a bulging portion 52. The bulging portion 52 bulges out along an extending direction E toward a guide surface (first surface) 54 that guides exhaust gas, which is one of the surfaces of the guide portion 50, at a central portion of the width direction (X direction) of the guide portion 50. The guide portion 50, including the bulging portion 52, has a streamlined shape, and therefore offers little resistance to exhaust gas. The second surface 56 of the guide portion 50 is the surface behind the first surface 54.

[0042] The guide portion 50 starts out as a semi-cylindrical shape from one side in the extension direction E to the other, with a bulge portion 52 formed in the widthwise center halfway through, and the side end portion 58 gradually curving back toward the discharge direction D.

[0043] The width of the bulging portion 52 at the end on the discharge outlet 46a side (first side) in the extension direction E is larger than the width of the end on the second side opposite the first side in the extension direction E. In addition, the distance between the side ends 58 of the guide portion 50 increases from the first side toward the second side.

[0044] That is, the guide portion 50 has a changed end surface shape corresponding to a cut surface perpendicular to the extending direction E. Hereinafter, with respect to the guide portion 50, the end surface shape corresponding to the cut surface perpendicular to the extending direction E will be simply referred to as an "end surface."

[0045] Between the first end of the guide portion 50 and the position P1, the side end portions 58 (58a, 58b) on the end face of the guide portion 50 are in a first warped state. The first warped state refers to a state in which the side end portions 58 are warped such that one (rear) side end portion 58a side and the other (front) side end portion 58b side face each other on the first surface 54 side, as shown in FIG. 6. The first warped state may also refer to a state in which the side end portions 58 are warped such that both the one side end portion 58a side and the other side end portion 58b side face the bulging portion 52.

[0046] Specifically, the side end 58 of the guide portion 50 is curved downwardly of the vehicle 10 between the first end of the guide portion 50 and the position P1.

[0047] Furthermore, the end face shape of the guide portion 50 at the portion where the bulge portion 52 exists between the first end of the guide portion 50 and position P1, i.e., the shape of the AA end face, is M-shaped as shown in Fig. 6. On the other hand, the end face shape of the guide portion 50 at the portion where the bulge portion 52 does not exist between the discharge port 46a and position P1 is an arc shape.

[0048] Between positions P1 and P2, the side end 58 on the end face of the guide portion 50 is in the first warped state. Position P2 is an intermediate position in the extending direction E, and is the end position of the curvature of the side end 58. Position P2 is located on the second side in the extending direction E, which is opposite to the first side from position P1.

[0049] Between positions P1 and P2, the side end 58 of the guide 50 approaches a flat state as it moves from the first side to the second side. The flat state refers to a state in which the side end 58 extends in the same straight line, as shown in FIG.

[0050] At position P2, the side end 58 of the guide portion 50 is in a flat plate state. At position P2, the end face shape of the guide portion 50, i.e., the shape of the BB end face, is hat-shaped as shown in Fig. 7. At position P2, if the bulge portion 52 does not exist, the end face shape of the guide portion 50 is flat plate-shaped.

[0051] Between position P2 and the second end of the guide portion 50, the side end portion 58 on the end face of the guide portion 50 is in a second warped state. The second warped state refers to a state in which the side end portion 58 is warped such that one side end portion 58a and the other side end portion 58b face each other on the second surface 56 side, as shown in FIG.

[0052] Furthermore, between position P2 and the end portion on the second side of the guide portion 50, the degree of warping of the side end portion 58 of the guide portion 50 increases as it progresses toward the second side.

[0053] Furthermore, as described above, the guide portion 50 curves downward while extending from position P1 along the discharging direction D, and position P2 is located on the second side of position P1 in the extending direction E, as described above. That is, the side end portion 58 is in a second warped state at the location where the guide portion 50 extends downward. For these reasons, the side end portion 58 warps toward the discharging direction D between position P2 and the end portion on the second side of the guide portion 50. That is, it can be said that the side end portion 58 includes warped portions 60 (60a, 60b) warped toward the discharging direction D.

[0054] At position P3 between position P2 and the second end of the guide portion 50, the side end portion 58 of the end face of the guide portion 50 is in a second warped state. At position P3, the end face shape of the guide portion 50, that is, the shape of the CC end face, is substantially V-shaped as shown in Fig. 8. At position P3, if the bulging portion 52 does not exist, the end face shape of the guide portion 50 is dish-shaped.

[0055] Such an exhaust gas guiding device 48 can guide exhaust gas toward the ground. Therefore, for example, it is possible to prevent people, particularly children, present on the sides of the vehicle 10 from being exposed to exhaust gas. Also, for example, in such a case, it is possible to prevent people, etc. present on the sides of the vehicle 10 from being exposed to exhaust gas. Particularly, for example, in such a case, it is possible to prevent the face of a child present on the side of the vehicle 10 from being exposed to exhaust gas.

[0056] For these reasons, the exhaust gas guidance device 48 can suppress heat damage caused by exhaust gas, specifically, heat damage to physical objects present to the sides of the vehicle 10 caused by exhaust gas.

[0057] Fig. 9 is a schematic end view conceptually showing the horizontal diffusion of exhaust gas. Like Fig. 8, Fig. 9 is also a schematic end view showing the CC end face of the exhaust gas guiding device 48 shown in Figs. 3 and 4. Hereinafter, the flow of exhaust gas will be explained with reference to Figs. 5 and 9. In Figs. 5 and 9, the flow of exhaust gas is represented by a dashed line with an arrow.

[0058] The exhaust gas discharged from the exhaust port 46a into the atmosphere along the discharge direction D is guided toward the second side of the guide unit 50. Therefore, the exhaust gas guided from the position P1 to the second side by the guide unit 50 has both a velocity component in the discharge direction D and a velocity component in the downward direction of the vehicle 10 as a whole.

[0059] Therefore, after the exhaust gas flows along the guide portion 50 to the position P2, the exhaust gas flows downwardly of the vehicle 10 and is caused to flow along the exhaust direction D by the warped portion 60.

[0060] As described above, the bulging portion 52 has a streamlined convex shape and has little resistance to exhaust gas. Therefore, the exhaust gas that comes into contact with the bulging portion 52 of the guide portion 50 is divided by the velocity component of the discharge direction D and guided along the bulging portion 52 to the side end portion 58, specifically, to the warped portion 60.

[0061] Next, the exhaust gas flows from the warped portion 60 along the discharge direction D. At that time, Karman vortexes caused by the warped portion 60 are generated on the second surface 56 side of the guide portion 50. Therefore, when the exhaust gas flows from the warped portion 60 toward the discharge direction D, it mixes with the atmosphere.

[0062] Therefore, the exhaust gas having a velocity component in the discharge direction D is diffused on a horizontal plane toward the discharge direction D on the side of the exhaust gas guiding device 48 toward the discharge direction D. Specifically, the exhaust gas is diffused in a fan shape toward the discharge direction D on the horizontal plane.

[0063] According to this type of exhaust gas guiding device 48, when the exhaust gas reaches position P2 of the guiding section 50, it flows downward of the vehicle 10 while diffusing in a fan shape toward the exhaust direction D on the horizontal plane, on the exhaust direction D side of the exhaust gas guiding device 48.

[0064] In other words, according to the exhaust gas guiding device 48, the range of exhaust gas radiation is expanded, and the amount of heat transferred from the exhaust gas per unit area of ​​the ground exposed to the exhaust gas is reduced compared to before the expansion of the exhaust gas radiation range.

[0065] Furthermore, according to the exhaust gas guiding device 48, when the exhaust gas flows from the warped portion 60 in the discharge direction D, it mixes with the atmosphere due to the Karman vortex, and is therefore efficiently cooled.

[0066] For these reasons, the exhaust gas guiding device 48 guides the exhaust gas toward the ground, and suppresses thermal damage caused by the exhaust gas, specifically, thermal damage to the ground caused by the exhaust gas.

[0067] Furthermore, since the bulging portion 52 is provided on the first surface 54 side that guides the exhaust gas in the guide portion 50, the exhaust gas is diffused along the bulging portion 52, and the exhaust gas can be easily guided to the side end portion 58 side. This increases the proportion of the exhaust gas that is affected by the Karman vortex, which can further promote the expansion of the exhaust gas emission range and cooling.

[0068] In addition, in the bulging portion 52 of this embodiment, the width is larger on the first side, so that the exhaust gas can be diffused at an early stage and guided to the side end side.

[0069] In addition, in this embodiment, the exhaust gas discharge direction D is a direction away from the vehicle 10 in the vehicle width direction of the vehicle 10 (to the right), and the extension direction E of the guide portion 50 includes the vehicle width direction, so that the exhaust gas discharged from the exhaust outlet 46a can be smoothly guided toward the ground on the side of the vehicle 10.

[0070] Furthermore, the distance between the side ends 58 of the guide portion 50 becomes larger from the first side to the second side in the extension direction E, so that the exhaust gas is diffused in a fan shape on the first surface of the guide portion 50 from the first side to the second side in the extension direction E of the guide portion 50. This further expands the emission range of the exhaust gas, and makes it possible to further suppress the thermal damage caused by the exhaust gas.

[0071] This concludes the description of the embodiments of the present invention, but the specific configurations shown in the present embodiments are merely examples, and the aspects of the present invention are not limited to the configurations shown in each embodiment.

[0072] For example, the exhaust direction D of the exhaust gas may be a direction away from the vehicle 10 in the vehicle length direction of the vehicle 10, specifically, a direction toward the rear of the vehicle 10. In this case, the extension direction E of the guide portion 50 includes the vehicle length direction. [Explanation of symbols]

[0073] 10 Vehicles 30 Engine 46 Tailpipe 46a Outlet 48 Exhaust Gas Guidance Device 50 Information Department 52 Bulge 54 Guidance surface 58 Side edge 58a Side end 58b Side edge 60 Warped part 60a Warped part 60b Warped part D Discharge direction E Extending direction

Claims

1. An exhaust gas guiding device that guides exhaust gas generated by an engine of a vehicle and discharged into the atmosphere from an exhaust port, A plate-shaped guide portion that guides the exhaust gas downward by extending along the exhaust gas discharge direction and curving downward, The exhaust gas guide device, wherein a side end portion of the guide portion includes a warped portion that is warped toward the exhaust direction.

2. The exhaust gas guide device according to claim 1 , wherein the guide portion includes a bulging portion that bulges out along an extending direction of the guide portion, on a guide surface side that guides the exhaust gas.

3. The exhaust gas guide device according to claim 2 , wherein the width of the bulge portion at an end on a first side, which is the exhaust outlet side in the extension direction, is larger than the width of the end on a second side, which is opposite the first side in the extension direction.

4. The discharge direction is a direction away from the vehicle in a vehicle width direction of the vehicle, The exhaust gas guide device according to claim 1 , wherein an extending direction of the guide portion includes the vehicle width direction.

5. The exhaust gas guide device of claim 1 , wherein the distance between the side ends increases from a first side, which is the exhaust outlet side in the extension direction of the guide portion, toward a second side, which is opposite the first side in the extension direction.

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