JP2020147104A - Rear structure of vehicle mounted with rear engine - Google Patents

Abstract

To prevent heat accumulation inside a cover member covering an exhaust purification device.SOLUTION: A rear structure of a vehicle mounted with a rear engine comprises: a rear lid 16; an exhaust purification device 5; a radiator fan 4B; a cover member 6; a side lid 14; and an air guide plate 7. The rear lid 16 closes a rear end of an engine room 2 of a vehicle 1 mounted with the rear engine. The exhaust purification device 5 is arranged in either one of a right-side space or a left-side space of the engine room 2. The radiator fan 4B is arranged in the other of the right-side space or the left-side space of the engine room 2. The cover member 6 encloses the exhaust purification device 5 and has a concave section 6f on an upper wall face 6e thereof, a first opening 6d facing the radiator fan 4B, and a second opening 6i formed in the concave section 6f. The side lid 14 serves as either a right side face or a left side face of the vehicle 1 mounted with the rear engine and is arranged with a distance from the cover member 6. The air guide plate 7 is vertically arranged between the cover member 6 and the side lid 14 and guides air flowing along the concave section 6f downward.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rear structure of a rear engine vehicle in which an engine room is provided at the rear of the vehicle body.

Conventionally, a rear engine vehicle in which an engine room is provided at the rear of the vehicle body is known (see, for example, Patent Document 1). In the engine room of such a rear engine vehicle, not only the engine but also various devices such as an exhaust purification device for purifying the exhaust of the engine and a radiator for cooling the engine are arranged.

Utility Model Registration No. 2602829

In order to suppress the generation of heat damage by the exhaust gas purification device in the engine room, it is effective to cover the exhaust gas purification device with a cover member. However, in general, various devices such as sensors and injectors that are easily affected by heat are attached to the exhaust purification device. Therefore, when the exhaust purification device is covered with a cover member, the heat trapped inside the cover member is generated. There is a risk of affecting the equipment of. For this reason, there is a demand for a technique for suppressing heat buildup inside the cover member while suppressing the occurrence of heat damage to the exhaust gas purification device with the cover member.

The rear structure of the rear engine vehicle of this case was devised in view of the above-mentioned problems, and one of the purposes is to suppress heat buildup inside the cover member covering the exhaust purification device.

The rear structure of the rear engine vehicle disclosed here includes a rear lid that closes the rear end of the engine room of the rear engine vehicle, exhaust purification devices arranged on either the left or right side of the engine room, and left and right sides of the engine room. A cover member having a radiator fan arranged on the other side, a recess formed on the upper wall surface of the exhaust purifying device, and a first opening facing the radiator fan and a second opening formed in the recess. A side lid that forms one of the left and right sides of the rear engine vehicle and is arranged with a gap from the cover member, and the side lid that is erected in the vertical direction between the cover member and the side lid. It is characterized by being equipped with a baffle plate that guides the wind flowing down the dent downward.

As a result, in the cover member that covers the exhaust gas purification device, the volume of the cover member is reduced by the amount of the dent, and the heat inside is discharged to the outside through the second opening, so that the heat is less likely to be trapped inside. Further, the wind discharged from the radiator fan reaches the cover member through the rear lid, but the baffle plate erected in the vertical direction between the cover member and the side lid flows along the dent. By guiding the wind downward, the heat discharged from the second opening is flowed downward.

According to the rear structure of the rear engine vehicle of the disclosure, heat buildup inside the cover member covering the exhaust purification device can be suppressed.

It is a schematic top view of the rear structure of the rear engine vehicle which concerns on embodiment. It is a figure which looked at the main part in the rear structure of FIG. 1 from an oblique rear view. It is a left side view of the main part in the rear structure of FIG. It is the figure which looked at the X part of FIG. 3 from an oblique front.

The rear structure of the rear engine vehicle as an embodiment will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments.

[1. Constitution]
The rear structure of the rear engine vehicle according to the present embodiment is applied to the rear engine bus 1 (rear engine vehicle) shown in FIG. The rear engine bus 1 is a large bus in which the engine 3 is mounted in the engine room 2 provided at the rear of the vehicle body. In this embodiment, the case where the engine 3 is a diesel engine will be illustrated.

The engine 3 is arranged between the left and right side rails 11 and 12 extending in the front-rear direction, and is supported by the side rails 11 and 12. End members 13 extending in the left-right direction (vehicle width direction) are connected to the rear ends of the side rails 11 and 12.

The engine room 2 has side panels 14 and 15 arranged outside the left and right side rails 11 and 12, end panels (rear lids) 16 arranged behind the end members 13, and front of the end panels 16. It is a space surrounded by the arranged front panel 17. The left side panel (side lid) 14 is a member forming the left side surface of the rear engine bus 1, and the right side panel 15 is a member forming the right side surface of the rear engine bus 1. Further, the end panel 16 is a hood that can be opened and closed to form the rear surface of the rear engine bus 1 and to open the engine room 2 to the rear. The upper part of the engine room 2 is separated from the vehicle interior space by a panel member (not shown). Further, the lower portion of the engine room 2 is open to the outside of the rear engine bus 1 except for the area between the right side rail 12 and the right side panel 15.

In the engine room 2, in addition to the engine 3 described above, a radiator unit 4 for cooling the cooling water of the engine 3, an exhaust purification device 5 for purifying the exhaust gas of the engine 3, and an exhaust purification device 5 are provided. A cover member 6 that covers the periphery is arranged. The radiator unit 4 and the exhaust gas purification device 5 are arranged so as to be separated from each other in the left-right direction with the engine 3 interposed therebetween. That is, the radiator unit 4 is arranged on one of the left and right sides of the engine room 2, and the exhaust gas purification device 5 is arranged on the left and right sides of the engine room 2. In the present embodiment, the case where the radiator unit 4 is arranged on the right side of the engine room 2 (the exhaust gas purification device 5 is arranged on the left side of the engine room 2) will be described.

The radiator unit 4 is arranged on the right side (outside) of the right side rail 12 and is supported by a radiator support (not shown) coupled to the right side rail 12. The radiator unit 4 has a radiator main body (heat exchanger) 4A through which the cooling water of the engine 3 circulates, and a radiator fan 4B that guides wind to the radiator main body 4A.

The radiator fan 4B is arranged behind the radiator main body 4A so as to face the end panel 16. The radiator fan 4B guides the air in front of the radiator main body 4A to the rear. That is, the radiator fan 4B discharges the wind that has passed through the radiator main body 4A toward the end panel 16. The air guided to the radiator fan 4B flows into the engine room 2 through, for example, a vent (not shown) provided on the right side panel 15.

As shown in FIG. 2, the exhaust gas purification device 5 is arranged on the left side (outside) of the left side rail 11, and is supported by a support assembly 18 coupled to the left side rail 11 and the front panel 17. The exhaust purification device 5 of the present embodiment includes a DPF muffler 5A containing a filter for collecting particulate matter in the exhaust and an SCR muffler containing a reduction catalyst for reducing nitrogen oxides (NOx) in the exhaust. Has 5B and. Both the DPF muffler 5A and the SCR muffler 5B are provided so that the axis (cylinder axis) is oriented in the front-rear direction. In addition, in FIG. 2 and FIGS. 3 and 4 described later, the left side panel 14 and the end panel 16 are omitted.

The DPF muffler 5A is arranged vertically above the SCR muffler 5B. That is, both the DPF muffler 5A and the SCR muffler 5B are arranged on the left side in the engine room 2. The DPF muffler 5A is located upstream of the SCR muffler 5B in the exhaust flow direction, and is connected to the exhaust manifold of the engine 3 via an upstream pipe 51. In the present embodiment, the case where the upstream pipe 51 is connected to the upstream end (rear end) of the DPF muffler 5A and extends below the left side rail 11 toward the engine 3 is exemplified. To do.

The SCR muffler 5B is connected to the DPF muffler 5A via an intermediate pipe 52. The intermediate pipe 52 of the present embodiment has a shape extending in the vertical direction so as to connect the downstream end (front side portion) of the DPF muffler 5A and the upstream end (front side portion) of the SCR muffler 5B. A tail pipe 53 is connected to the downstream end (rear end) of the SCR muffler 5B.

A dosing module 9 for injecting a urea reducing agent is attached to the downstream end (front end portion) of the DPF muffler 5A of the present embodiment. In addition to the injector, the dosing module 9 has a plurality of connectors to which a pipe for supplying a reducing agent and a wiring for control are connected to the injector, and has a shape protruding from the DPF muffler 5A. The heat of the exhaust gas flowing in the DPF muffler 5A is transferred to the dosing module 9.

The cover member 6 is for creating a wind path around the exhaust gas purification device 5 while blocking the heat released from the exhaust gas purification device 5. The cover member 6 is arranged with a gap from the left side panel 14. As shown in FIGS. 2 and 3, the cover member 6 of the present embodiment mainly includes an upper cover 6A that covers the periphery of the DPF muffler 5A, a lower cover 6B that mainly covers the periphery of the SCR muffler 5B, and a tail pipe. It has a ceiling cover 6C that covers the upper side of the 53. The cover member 6 is formed of, for example, sheet metal, and is fastened and fixed to the left side rail 11, the end member 16, the front panel 17, and the support assembly 18 with a plurality of bolts.

The upper cover 6A is arranged above the support assembly 18. The upper cover 6A is shaped so as to cover the entire periphery except the lower side of the DPF muffler 5A. On the other hand, as shown in FIG. 3, the lower cover 6B is arranged below the support assembly 18. The lower cover 6B is shaped so as to cover the left side of the SCR muffler 5B. Further, the ceiling cover 6C is arranged behind the support assembly 18 and between the upper cover 6A and the lower cover 6B. The lower side of the SCR muffler 5B is not covered with the cover member 6 and is open to the outside. As described above, the cover member 6 has a shape having a U-shaped cross section in which the lower side is opened by the upper cover 6A and the lower cover 6B.

As shown in FIG. 3, the upper cover 6A is formed in the first opening 6d facing to the right behind the DPF muffler 5A, the recess 6f formed in the upper wall surface 6e of the upper cover 6A, and the recess 6f. It also has a second opening 6i. The upper wall surface 6e of the upper cover 6A is also the upper wall surface 6e of the cover member 6.

The first opening 6d is open toward the radiator fan 4B. The first opening 6d of the present embodiment is provided at the rear portion of the upper cover 6A and is adjacent to the end panel 16. The upper cover 6A takes in the wind flowing from the radiator fan 4B through the end panel 16 through the first opening 6d. In this way, the upper cover 6A functions as a duct for allowing the wind discharged from the radiator fan 4B to flow forward around the DPF muffler 5A.

The dent 6f is a portion where a part of the upper wall surface 6e is dented downward. The recess 6f of the present embodiment is formed at the upper left corner portion (outer corner portion in the vehicle width direction) at the front end portion of the upper cover 6A. Specifically, the dent 6f bends from the slope portion 6g and the inclined surface 6g that is inclined downward toward the left side (outside in the vehicle width direction), and forms a step between the slope portion 6g and the other surface of the upper cover 6A. It is composed of a stepped surface 6h provided so as to fill it.

The second opening 6i is a through hole for discharging the heat of the dosing module 9 to the outside of the upper cover 6A. The entire second opening 6i of the present embodiment is formed on an inclined surface 6g of a recess 6f. The specific position and shape of the second opening 6i are set according to the position and shape of the dosing module 9 so that the dosing module 9 is exposed to the outside of the upper cover 6A through the second opening 6i. That is, the position of the recess 6f described above is also set according to the position of the dosing module 9. The pipes and wiring connected to the dosing module 9 are pulled out to the outside of the upper cover 6A through the second opening 6i. In this way, the second opening 6i functions as a heat exhaust port for discharging the heat inside the cover member 6 to the outside.

As shown in FIGS. 3 and 4, the lower cover 6B of the present embodiment has a lower surface panel 6j extending to the left (outside in the vehicle width direction) from the lower edge portion thereof. The lower surface panel 6j extends straight from immediately after the front panel 17 to immediately before the end member 13. A plurality of exhaust holes 8 (only one is designated in FIGS. 3 and 4) are formed in a portion of the lower surface panel 6j in front of the baffle plate 7 described later. The exhaust hole 8 is a through hole for exhausting the wind flowing downward through the recess 6f in the engine room 2 to the outside of the vehicle. In this embodiment, the elliptical exhaust hole 8 is illustrated.

Further, as shown in FIGS. 1, 3 and 4, in the gap between the left side panel 14 and the cover member 6, a baffle plate 7 for guiding the wind flowing through the recess 6f downward is provided. Is placed. The baffle plate 7 of the present embodiment is erected in the vertical direction in a posture facing the front panel 17 from the rear. Further, as shown in FIG. 3, the baffle plate 7 is provided between the stepped surface 6h of the recess 6f and the lower surface panel 6j. Preferably, the baffle plate 7 is arranged without a gap with respect to both the cover member 6 and the side panel 14. As described above, in the present embodiment, the front panel 17, the cover member 6, the baffle plate 7, and the side panel 14 form a structure (chimney structure) that serves as a wind passage.

[2. Action]
As shown by the white arrows in FIG. 1, in the rear structure of the rear engine vehicle described above, the wind discharged rearward from the radiator fan 4B collides with the end panel 16, and the exhaust purification device 5 is positioned along the end panel 16. It flows in the direction (to the left in this embodiment). On the other hand, since the cover member 6 covering the periphery of the exhaust purification device 5 is provided with the first opening 6d facing the radiator fan 4B, a part of the wind flowing through the end panel 16 is first. It is taken into the inside of the cover member 6 from the opening 6d.

As shown by the broken white arrow in FIG. 3, the wind taken into the inside of the cover member 6 from the first opening 6d flows around the DPF muffler 5A, the intermediate pipe 52 and the SCR muffler 5B to purify the exhaust gas. The device 5 is cooled. In the present embodiment, since the lower side of the lower cover 6B is open to the outside, the wind flowing inside the cover member 6 flows out from below the lower cover 6B to the outside.

On the other hand, as shown by the solid white arrows in FIG. 3, a part of the wind flowing through the end panel 16 flows outside the cover member 6 along the outer surface of the cover member 6. When the wind flowing forward through the upper wall surface 6e of the upper cover 6A reaches the recess 6f, it hits the dosing module 9 arranged in the second opening 6i to cool the dosing module 9. Then, this wind is introduced into the chimney structure described above together with the heat discharged from the second opening 6i. In this way, the wind flowing through the recess 6f flows downward through the passage surrounded by the front panel 17, the cover member 6, the baffle plate 7, and the side panel 14, and then flows outward through the exhaust hole 8. Is discharged.

[3. effect]
(1) According to the rear structure of the rear engine vehicle described above, since the cover member 6 is provided with the recess 6f, the volume of the cover member 6 can be reduced by the amount of the recess 6f. Further, since the second opening 6i is formed in the recess 6f, the heat inside the cover member 6 can be discharged to the outside through the second opening 6i. As a result, it is possible to prevent heat from being trapped inside the cover member 6.

Further, as described above, the wind discharged from the radiator fan 4B is guided downward by the baffle plate 7 after reaching the recess 6f through the upper wall surface 6e of the end panel 16 and the cover member 6. Therefore, the heat discharged from the second opening 6i can flow downward together with this wind. This also makes it difficult for heat to be trapped inside the cover member 6. Therefore, according to the rear structure described above, heat buildup inside the cover member 6 can be suppressed.

Further, since the wind is taken into the inside of the cover member 6 through the first opening 6d, the wind can be positively flowed around the exhaust gas purification device 5. As a result, the radiant heat of the exhaust gas purification device 5 can be suppressed. Further, since the radiant heat of the exhaust gas purification device 5 is received by the cover member 6, it is possible to suppress the release of heat to the outside of the cover member 6. Therefore, according to the rear structure described above, it is possible to suppress the occurrence of heat damage by the exhaust gas purification device 5. For this reason, peripheral members that are susceptible to heat, such as the sensor attached to the DPF muffler 5A, the rubber bush attached to the support assembly 18, and the tail lamp fixed to the end member 16 (all not shown), are included. Can be protected.

(2) Since the dosing module 9 is arranged in the second opening 6i, the heat of the dosing module 9 can be discharged from the second opening 6i, and the wind from the radiator fan 4B hits the dosing module 9 to cause the dosing module 9 to work. Can be cooled. As a result, the temperature rise of the dosing module 9 can be suppressed.

(3) Since the lower panel 6j is provided with the exhaust hole 8, the wind guided downward by the baffle plate 7 can flow out from the exhaust hole 8 to the outside. As a result, the flow of wind downward from the recess 6f is promoted, so that the heat discharged through the second opening 6i can flow more appropriately. Therefore, it is possible to further suppress heat buildup inside the cover member 6.

(4) Since the baffle plate 7 is provided between the stepped surface 6h and the lower surface panel 6j, the wind flowing through the inclined surface 6g can be more appropriately guided to the exhaust hole 8 of the lower surface panel 6j. .. As a result, the flow of wind downward from the recess 6f is further promoted, so that the heat discharged through the second opening 6i can flow more appropriately, and the heat buildup inside the cover member 6 is further suppressed. be able to.

(5) Since the wind from the radiator fan 4B is more likely to flow along the inclined surface 6g than the stepped surface 6h in the recess 6f, when the entire second opening 6i is formed on the inclined surface 6g, the second opening 6i It is possible to make it easier to blow the wind on the whole. Therefore, the heat discharged from the second opening 6i is different from the case where the second opening 6i is formed over the inclined surface 6g and the stepped surface 6h, or the case where the entire second opening 6i is formed on the stepped surface 6h. It can flow downward more appropriately with the wind. Therefore, it is possible to further suppress heat buildup inside the cover member 6.

[4. Modification example]
Regardless of the above-described embodiment, it can be modified in various ways without departing from the purpose thereof. Each configuration of the present embodiment can be selected as needed, or may be combined as appropriate.

The configuration of the cover member 6 described above is an example. The first opening 6d provided in the cover member 6 only needs to face the radiator fan 4B at least and can take in the wind flowing through the end panel 16, and its specific shape and position are not particularly limited. Further, the recess 6f may be formed on the upper wall surface 6e, and its shape is not particularly limited. Similarly, the second opening 6i may be formed in the recess 6f, and its shape is not particularly limited. A device (for example, a sensor) other than the above-mentioned dosing module 9 may be arranged in the second opening 6i. The exhaust hole 8 may be omitted.

Further, in the above-described embodiment, the case where the exhaust gas purification device 5 is arranged on the left side in the engine room 2 and the radiator fan 4B is arranged on the right side has been described, but conversely, in the engine room 2. The exhaust gas purification device 5 may be arranged on the right side of the above, and the radiator fan 4B may be arranged on the left side. In this case, the cover member that covers the periphery of the exhaust gas purification device 5 is formed with a first opening facing left, a recess, and a second opening, and is between the cover member and the right side panel 15. A baffle plate may be erected in.

Further, the object to which this rear structure is applied is not limited to the rear engine bus 1 described above. This rear structure can be similarly applied to, for example, a construction machine in which an engine room is provided at the rear of the vehicle body.

1 Rear engine bus (rear engine car)
2 Engine room 4B Radiator fan 5 Exhaust purification device 6 Cover member 6d First opening 6e Upper wall surface 6f Recess 6i Second opening 7 Baffle plate 14 Side panel (side lid)
16 End panel (rear lid)

Claims (1)

A rear lid that closes the rear end of the engine room of a rear engine car,
Exhaust gas purification devices located on either the left or right side of the engine room,
Radiator fans located on the left and right sides of the engine room,
A cover member that covers the periphery of the exhaust gas purification device and has a recess formed on the upper wall surface thereof, a first opening facing the radiator fan, and a second opening formed in the recess.
A side lid that forms one of the left and right sides of the rear engine vehicle and is arranged with a gap from the cover member.
A rear structure of a rear engine vehicle, which is provided with a baffle plate which is erected vertically between the cover member and the lateral lid and guides the wind flowing through the recess downward. ..

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