WO2020067415A1

WO2020067415A1 - Exhaust structure and vehicle

Info

Publication number: WO2020067415A1
Application number: PCT/JP2019/038126
Authority: WO
Inventors: 佑二新家
Original assignee: いすゞ自動車株式会社
Priority date: 2018-09-28
Filing date: 2019-09-27
Publication date: 2020-04-02
Also published as: JP7243107B2; CN112752899A; CN112752899B; JP2020051408A

Abstract

Provided are an exhaust structure and a vehicle with which peripheral heat damage can be minimized. An exhaust structure (20) has: an exhaust pipe (21) connected to an engine (10); and a terminal part (23) which is provided to the end part in the exhaust pipe (21) on the side opposite from the engine (10), which is arranged in a position nearer to one end side than the widthwise center of a vehicle (100) in which the engine (10) is installed, and which has an exhaust port (232) that discharges exhaust gas toward the other end side of the vehicle (100) in the width direction.

Description

Exhaust structure and vehicle

The present disclosure relates to an exhaust structure of an internal combustion engine and a vehicle having the exhaust structure.

(4) A vehicle equipped with an internal combustion engine employs an exhaust structure including a post-processing device that performs necessary processing such as purification on exhaust gas before exhausting the exhaust gas emitted by the internal combustion engine to the outside. As an example of such an exhaust structure, there is a technique disclosed in Patent Document 1, for example.

In Patent Document 1, the DPF casing and the SCR casing are arranged so that both axes are oriented in the vehicle width direction (that is, substantially parallel), and the DPF casing is arranged diagonally above the SCR casing. Techniques are disclosed.

Japanese Patent Application Laid-Open No. 2012-149535

技術 In the technique disclosed in Patent Document 1, a tail pipe from which exhaust gas is discharged is provided toward the outside of the vehicle. Since the exhaust gas is at a high temperature, it may adversely affect people, objects, and the like existing in the surroundings due to heat. Therefore, there is a demand for an exhaust structure capable of suppressing heat damage to the surroundings.

The present disclosure aims to provide an exhaust structure and a vehicle that can suppress heat damage to the surroundings.

An exhaust structure according to an aspect of the present disclosure includes an exhaust pipe that flows exhaust gas discharged from an internal combustion engine mounted on a vehicle, and an exhaust pipe that is disposed below the vehicle and downstream of the exhaust pipe, and is disposed on a right side of the vehicle. Or an end portion for discharging the exhaust gas from the left side toward the left side or the right side of the vehicle.

車両 A vehicle according to an aspect of the present disclosure has the exhaust structure.

According to the present disclosure, heat damage to surroundings can be suppressed.

Schematic view of the vehicle viewed from below Diagram for explaining the exhaust structure Diagram for explaining the exhaust end part

Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings. However, an unnecessary detailed description, for example, a detailed description of a well-known matter or a redundant description of substantially the same configuration may be omitted.

<Configuration of vehicle>
FIG. 1 is a schematic diagram when the vehicle 100 is viewed from below. In the present embodiment, a vehicle provided with a ladder frame, such as a truck, is assumed as the vehicle 100. The present disclosure is not limited to vehicles having such a ladder frame, but can be applied to vehicles having other structures, such as vehicles having a monocoque body. Hereinafter, the description will be made using the front, rear, left, and right directions when the vehicle 100 is viewed from below. That is, the vehicle width direction corresponds to the left-right direction, and the vehicle length direction corresponds to the front-back direction.

As shown in FIG. 1, the vehicle 100 includes an engine 10, an exhaust structure 20, a transmission 30, a front wheel 40, a rear wheel 50, a spare tire 60, an air tank 70, a fuel tank 80, and a vehicle body 200. The vehicle body 200 is a bodywork, a cab, or the like. The components of the vehicle 100 other than the vehicle body 200 shown in FIG. 1 are fixed to a frame (not shown) of the vehicle 100, a lower portion of the vehicle body 200, and the like.

The engine 10 is an internal combustion engine such as a gasoline engine or a diesel engine. The engine 10 burns fuel (gasoline, light oil, or the like) stored in the fuel tank 80 to generate driving force for the vehicle 100. Exhaust gas generated by the combustion flows into the exhaust structure 20.

The exhaust structure 20 has an exhaust pipe 21, a post-processing device 22, and an end portion 23. The exhaust pipe 21 is connected to the engine 10 and the aftertreatment device 22. The post-processing device 22 purifies exhaust gas discharged from the engine 10. The post-processing device 22 includes a catalyst, a filter, and the like. More specifically, a urea SCR (Selective Catalytic Reduction) system, a DPF (Diesel Particulate Filter) or the like can be included. The exhaust gas purified by the post-processing device 22 is discharged from the terminal portion 23.

In the example illustrated in FIG. 1, the post-processing device 22 is disposed near the left end, which is one end of the vehicle 100 in the vehicle width direction. The end portion 23 discharges exhaust gas from the post-processing device 22 arranged near the left end in the vehicle width direction toward the right end in the vehicle width direction.

A guide plate 221 is provided near the part of the post-processing device 22 that discharges the exhaust gas from the terminal part 23 so that the exhaust gas discharged from the terminal part 23 hardly flows to the upper side, that is, to the vehicle body 200 side. It has become. The details of the terminal portion 23 and the guide plate 221 will be described later.

The driving force generated by the engine 10 is transmitted to the rear wheels 50 via the crankshaft 11, the transmission 30, the propeller shaft 31, the differential gear 51, the drive shaft 52, and the like. Thereby, the vehicle 100 runs.

A spare tire 60 is mounted on the left side of the center of the vehicle 100 in the vehicle width direction and at the rear of the post-processing device 22.

An air tank 70 and a fuel tank 80 are provided near the right end of the vehicle 100 in the vehicle width direction. In the air tank 70, air supplied to a brake system, a suspension, a transmission 30 and the like (not shown) of the vehicle 100 is pressurized and stored. Fuel consumed by the engine 10 is stored in the fuel tank 80.

As described above, in the example illustrated in FIG. 1, the post-processing device 22 is disposed near the left end in the vehicle width direction of the vehicle 100, and the end portion 23 is configured to emit the exhaust gas toward the right side in the vehicle width direction. Is opened in such a direction as to discharge air. Note that the post-processing device 22 and the terminal end portion 23 may be arranged, for example, near the right end portion of the vehicle 100 instead of the left end portion in the vehicle width direction.

実 The solid line arrow A1 in FIG. 1 indicates the direction of exhaust gas emission when the vehicle 100 is stopped and there is no wind. On the other hand, the dotted arrow A2 indicates an example of the exhaust gas discharge direction in a state where the wind is blowing from the front, such as the running state of the vehicle 100.

排気 Thus, the exhaust gas discharged from the terminal end portion 23 of the post-processing device 22 flows from the left end in the vehicle width direction of the vehicle 100 toward the right end. Therefore, the exhaust gas flows toward the lower side of the vehicle body 200 and directly flows out of the vehicle body 200. In the present specification, “below the vehicle body 200” means a space inside the outer periphery of the vehicle body 200 when the vehicle 100 is viewed from below. In addition, in this specification, “outside the vehicle body 200” means a space outside the outer periphery of the vehicle body 200 when the vehicle 100 is viewed from above or below.

Therefore, the exhaust gas discharged from the terminal portion 23 diffuses below the vehicle body 200 and mixes with the outside air before flowing out of the vehicle body 200. For this reason, when flowing out of the vehicle body 200, the temperature of the exhaust gas is reduced by the outside air. Thus, heat damage to objects and people around the vehicle 100 due to the high-temperature exhaust gas can be suppressed.

<Post-treatment device and exhaust terminal>
FIG. 2A is a diagram for explaining the exhaust structure 20. FIG. 2B is a diagram for explaining the terminating portion 23. 2A and 2B correspond to the respective directions when the vehicle 100 is viewed from below, as in FIG.

As shown in FIG. 2A, the post-processing device 22 is a device having a plurality of surfaces, and has an opening 222 on one surface. In the example illustrated in FIG. 2A, the post-processing device 22 is formed in a substantially triangular prism shape, but the present disclosure is not limited to this, and may have another shape (substantially cylindrical shape, quadrangular prism shape, or the like). An exhaust pipe 21 extending from the engine 10 is connected to a surface of the post-processing device 22 other than the surface provided with the opening 222. A flow path (not shown) for connecting the exhaust pipe 21 and the opening 222 is provided inside the post-processing device 22, and the exhaust gas flowing through this flow path is purified.

{Circle around (2)} As shown in FIG. 2A, a terminal portion 23 is attached to the surface of the post-processing device 22 where the opening 222 is provided so as to cover the opening 222. The terminal portion 23 is a terminal portion of the exhaust structure of the vehicle 100. The end portion 23 has an exhaust inlet 231 connected to the opening 222, an exhaust outlet 232 for discharging exhaust gas, and a partition plate 233 forming a flow path of the exhaust gas.

(4) The inner wall surface of the end portion 23 and the partition plate 233 form a flow path until the exhaust gas flowing from the exhaust inlet 231 flows out of the exhaust port 232. In FIG. 2A, the partition plate 233 is hatched to make it easier to see. An arrow A3 shown in FIG. 2A illustrates the flow of the exhaust gas flowing through the flow path in the terminal end portion 23.

FIG. 2B shows a state where the post-processing device 22 and the terminal end portion 23 are viewed from the rear side of the vehicle 100. As can be seen from FIG. 2B, the lower end surface of the end portion 23 is formed to be inclined so as to slightly rise upward as approaching the exhaust port 232. Accordingly, the exhaust gas flows slightly upward as indicated by an arrow A4 just after being discharged from the exhaust port 232. An arrow A4 illustrates the flow of the exhaust gas discharged from the exhaust port 232 of the terminal end portion 23. Since the lower end surface of the terminal end portion 23 is provided with an inclination, a wide flow path cross-sectional area of the exhaust gas inside the terminal end portion 23 can be secured. That is, in the terminal portion 23, the rectifying effect of the exhaust gas is obtained by the installation of the partition plate 233 and the inclination of the lower end surface of the terminal portion 23, and the suppression of the exhaust noise due to the decrease in the flow rate of the exhaust gas is expected. .

As shown in FIGS. 1 and 2B, a guide plate 221 is provided above the post-processing device 22 so as to extend to the right of the post-processing device. Further, the guide plate 221 is formed to be inclined so as to be slightly lowered as it goes to the tip. The exhaust gas discharged from the exhaust port 232 of the terminal end portion 23 is guided by the guide plate 221 so as to flow downward (in a direction away from the vehicle body 200), and does not flow upward. Therefore, heat damage to the vehicle body 200 due to the exhaust gas can be suppressed.

In addition, as shown in FIG. 2B, since the lower end surface of the end portion 23 is formed to be inclined upward, the exhaust gas does not blow on the road surface (that is, the lower side shown in FIG. Soaring of dust and dust is prevented. Then, the exhaust gas discharged slightly upward from the exhaust port 232 collides with the guide plate 221 as shown in FIG. 2B and is guided slightly downward along the guide plate 221 that is inclined downward. Accordingly, it is possible to prevent the exhaust gas from flowing toward the vehicle body 200 located above the guide plate 221, and to suppress heat damage to the vehicle body 200 due to the exhaust gas.

<Exhaust gas heat damage countermeasures>
As described above, in the present invention, the exhaust gas discharged from the terminal end portion 23 of the post-processing device 22 is discharged toward the lower side of the vehicle body 200, and is not directly discharged outside the vehicle body 200. I have. Therefore, heat damage to objects and people existing around the vehicle 100 can be suppressed. However, since the high-temperature exhaust gas is discharged to the lower side of the vehicle body 200, it is necessary to take measures against heat damage of the respective components shown in FIG. Hereinafter, a specific example of the heat damage countermeasure will be described.

First, as described above, the guide plate 221 can suppress heat damage of the exhaust gas to the vehicle body 200.

Next, as shown in FIG. 1, a transmission 30 is provided in the exhaust gas discharge direction at the terminal end portion 23 of the post-processing device 22. If the exhaust gas directly hits the case of the transmission 30, for example, rubber parts and the like inside the transmission 30 become high temperature and deteriorate, which may adversely affect the running of the vehicle 100. Also, the cable harness through which the electric signal for controlling the transmission flows may be similarly affected. For this reason, it is preferable to provide a heat protector on the lower surface of the transmission 30, change the cable harness for the transmission to a material having high heat resistance, or take other measures against heat damage.

Further, as shown in FIG. 1, a spare tire 60 is provided adjacent to the terminal end 23 of the post-processing device 22. When the end portion 23 itself becomes hot due to the exhaust gas, the spare tire 60 may be affected by the heat. In order to prevent this, it is preferable to provide a heat protector between the spare tire 60 and the end portion 23 side.

As shown in FIG. 1, an air tank 70 is provided at the end of the transmission 30 in a direction in which the exhaust gas is discharged when the vehicle 100 is stopped and no wind is present. If rubber or the like is used for the drain cock 71 for drainage provided in the air tank 70, the drain cock may be deteriorated by heat of the exhaust gas. Therefore, the drain cock is changed to a metal or the like having high heat resistance. This is preferable.

In addition, as shown in FIG. 1, when the wind is blowing from the front, such as the running state of the vehicle 100, the exhaust gas may flow in the direction of the fuel tank 80 as shown by the arrow A2. The fuel tank 80 may be attached to the vehicle body 200 in a state where a rubber bracket or the like is chewed, and in such a case, the bracket may be deteriorated due to high temperature of the exhaust gas. In order to prevent this, it is preferable to provide a heat protector so as to cover the side surface and the lower surface of the fuel tank 80.

トルク Although not shown, the torque stabilizer applied to the nut used for the fastening portion of the rod member for attaching the axle such as the rear wheel 50 to the frame of the vehicle 100 may be melted by heat and loosened. In order to prevent this, it is preferable to change the nut of the fastening portion to a lock nut.

部品 Besides the above-described example, components that are not assumed to be placed in a high-temperature environment may be disposed below the vehicle body 200. For such components, for example, a control device such as various controllers, a cable harness connected to the control device, and various resin (rubber and the like) components, a heat protector is installed and countermeasures against heat damage such as a change in material are performed. It is suitable.

<Action and effect>
As described above, the exhaust structure 20 according to the embodiment of the present disclosure includes the exhaust pipe 21 for flowing the exhaust gas discharged from the engine 10 mounted on the vehicle 100 and the exhaust pipe 21 on the lower side of the vehicle 100 and the exhaust pipe 21. A terminal portion 23 is disposed downstream and discharges exhaust gas from the right or left side of the vehicle 100 toward the left or right side of the vehicle 100.

Particularly, a post-processing device 22 for purifying exhaust gas is provided downstream of the exhaust pipe 21 and upstream of the terminal portion 23, and the terminal portion 23 is attached to the post-processing device 22. A guide plate 221 is provided for guiding the exhaust gas discharged from the terminal end 23 in a direction away from the vehicle 100.

With such a configuration, the exhaust gas discharged from the terminal end portion 23 is diffused below the vehicle body 200, mixed with the outside air, and then flows out of the vehicle body 200. For this reason, when flowing out of the vehicle body 200, the temperature of the exhaust gas is reduced by the outside air. Thus, heat damage to objects and people around the vehicle 100 due to the high-temperature exhaust gas can be suppressed.

It is more preferable that the post-processing device 22 and the terminal portion 23 are arranged outside the side members of the ladder frame of the vehicle 100. The reason is that it is possible to secure a large distance until exhaust gas discharged from the terminal end portion 23 flows out of the vehicle body 200 to the outside.

This application is based on a Japanese patent application filed on Sep. 28, 2018 (Japanese Patent Application No. 2018-184281), the contents of which are incorporated herein by reference.

The present disclosure is useful for an exhaust structure that discharges exhaust gas of an internal combustion engine.

DESCRIPTION OF SYMBOLS 10 Engine 11 Crankshaft 20 Exhaust structure 21 Exhaust pipe 22 Post-processing device 221 Guide plate 222 Opening 23 Termination part 231 Exhaust inflow port 232 Exhaust port 233 Partition plate 30 Transmission 31 Propeller shaft 40 Front wheel 50 Rear wheel 51 Differential gear 52 Drive shaft 60 Spare tire 70 Air tank 80 Fuel tank 100 Vehicle 200 Body

Claims

An exhaust pipe for flowing exhaust gas discharged from an internal combustion engine mounted on the vehicle,
A terminal portion that is disposed below the vehicle and downstream of the exhaust pipe and that discharges the exhaust gas from a right side or a left side of the vehicle toward a left side or a right side of the vehicle.
Having an exhaust structure.
A post-processing device that is disposed downstream of the exhaust pipe and upstream of the terminal end, and that purifies the exhaust gas.
The exhaust structure according to claim 1.
The end portion is attached to the post-processing device,
The exhaust structure according to claim 2.
A guide plate for guiding the exhaust gas discharged from the terminal end in a direction away from the vehicle,
The exhaust structure according to any one of claims 1 to 3.
A vehicle having the exhaust structure according to any one of claims 1 to 4.