JP6376202B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a front structure of a vehicle, and more particularly, to a structure for taking a traveling wind into an air-cooled EGR cooler disposed on the rear side of an engine in an engine room.

  Conventionally, EGR (Exhaust Gas Recirculation) is performed in which a part of exhaust gas discharged from an engine is recirculated to intake air. By performing EGR in this way, it is possible to suppress an excessive increase in the combustion gas temperature to suppress the generation of nitrogen oxides (NOx) and to reduce the pumping loss during intake (for example, Patent Documents 1 and 2).

  With regard to the exhaust gas recirculated to the intake air of the engine, the temperature can be reduced to reduce the volume, thereby reducing the air filling efficiency and reducing the NOx reduction effect by EGR. Therefore, an EGR cooler is provided in the recirculation path. As an EGR cooler, an air-cooled type, a water-cooled type, or a combination of them is known. In particular, the use of an air-cooled EGR cooler is desirable from the viewpoint of reducing the load on the radiator.

JP 2007-177651 A JP 2002-188526 A

  However, when the air-cooled EGR cooler is disposed behind the engine, it is difficult to sufficiently guide the traveling wind to the air-cooled EGR cooler with the structure according to the related art. Specifically, in a vehicle in which exhaust gas is discharged from the rear of the engine, the air-cooled EGR cooler may be inevitably disposed behind the engine.

  In addition, the structure above the engine is generally covered with a cover for heat insulation and sound insulation, and there is almost no gap between the engine and the hood. For this reason, it is difficult to dispose a duct for guiding traveling air from the front grill to the air-cooled EGR cooler.

  The present invention has been made to solve the above-described problems, and even when an air-cooled EGR cooler is disposed behind the engine, the temperature of the exhaust gas that is recirculated to the intake air of the engine is reduced. It aims at providing the front part structure of the vehicle which can be reduced effectively.

A vehicle front structure according to an aspect of the present invention includes an engine, a cover, an EGR path, an air-cooled EGR cooler, a shroud, a grill, and a duct .

  The cover covers an upper side of the vehicle in the engine and has a duct.

The EGR path is a path for recirculating at least part of the exhaust gas discharged from the engine to the intake side of the engine.
The shroud is disposed on the front side of the vehicle with respect to the engine.
The grill is disposed on the front side of the vehicle with respect to the shroud.
The duct is provided in the grill.

  The air-cooled EGR cooler is disposed on the rear side of the vehicle with respect to the engine, and cools the exhaust gas flowing in the EGR path in response to traveling wind.

In the vehicle front structure according to this aspect, at least a part of the air guide path, which is a path that takes in the traveling wind from the front of the vehicle and guides the captured traveling wind to the air-cooled EGR cooler, The cover is constituted by the duct, and when the duct included in the cover is a first duct and the duct provided in the grill is a second duct, the cover is a fulcrum at a rear portion of the cover. It can be opened and closed freely,
The first duct extends from above the shroud to a front portion of the grill, and when the cover is closed, a front end opening of the first duct and a rear end opening of the second duct Are connected in a butted state.

In the vehicle front structure according to the above aspect, at least a part of the air guide path is configured by a duct (first duct) included in the cover. Therefore, even when the gap between the bonnet and the cover is narrow, a path for guiding the traveling wind to the air-cooled EGR cooler is ensured.
Moreover, in the vehicle front part structure according to the above aspect, the first duct and the second duct are divided so that the cover can be freely opened and closed. Therefore, the cover can be opened during maintenance, and high maintenance can be ensured.
In the state where the cover is closed, the traveling wind taken from the front end opening of the second duct is sent to the air-cooled EGR cooler through the first duct. Therefore, the exhaust gas can be reliably cooled during traveling.

Therefore, in this aspect, even when the air-cooled EGR cooler is disposed behind the engine, the temperature of the exhaust gas recirculated to the intake air of the engine can be effectively reduced.
The vehicle front structure according to another aspect of the present invention further includes a rear cover in the above configuration.
The rear cover covers a rear wall side of the engine.
In the vehicle front structure according to this aspect, the rear cover includes a duct that forms a part of an air guide path from a rear end of the duct (first duct) of the cover to the air-cooled EGR cooler. Have. Here, when the duct of the cover is a first duct and the duct of the rear cover is a third duct, the rear end opening of the first duct and the The upper end opening of the third duct is connected in a butted state.
In the vehicle front structure according to the above aspect, the rear cover has a third duct. Thereby, in this aspect, it is possible to form part of the air guide path by the third duct to a place closer to the air-cooled EGR cooler, and to cool the exhaust gas more reliably.
In addition, since the rear cover has the third duct, the air guide path can be secured without taking a useless space.

A vehicle front structure according to an aspect of the present invention includes an engine, a cover that covers an upper side of the vehicle in the engine, a duct, and at least part of exhaust gas discharged from the engine. An EGR path that is a path that recirculates to the intake side of the engine, an air-cooled EGR cooler that is disposed on the rear side of the vehicle with respect to the engine and that cools the exhaust gas that flows through the EGR path by receiving traveling wind. A rear cover that covers the rear wall side of the engine, and at least a part of an air guide path that is a path that takes in the traveling wind from the front of the vehicle and guides the captured traveling wind to the air-cooled EGR cooler. The duct is formed by the duct in the cover, and the rear cover is an air guide path from the rear end of the duct of the cover to the air-cooled EGR cooler. In the state where the cover is closed when the duct has a part of the duct, the duct of the cover is a first duct, and the duct of the rear cover is a third duct. The rear end opening and the upper end opening of the third duct are connected in a butted state.

In the vehicle front structure according to the above aspect, at least a part of the air guide path is configured by a duct (first duct) included in the cover. Therefore, even when the gap between the bonnet and the cover is narrow, a path for guiding the traveling wind to the air-cooled EGR cooler is ensured.
In the vehicle front structure according to the above aspect, the rear cover has a third duct. Thereby, in this aspect, it is possible to form part of the air guide path by the third duct to a place closer to the air-cooled EGR cooler, and to cool the exhaust gas more reliably.
In addition, since the rear cover has the third duct, the air guide path can be secured without taking a useless space.

  The vehicle front structure according to another aspect of the present invention further includes a shroud, a grill, and a duct provided in the grill in the above configuration.

  The shroud is disposed on the front side of the vehicle with respect to the engine.

  The grill is disposed on the front side of the vehicle with respect to the shroud.

  In this aspect, the cover can be opened and closed with the rear portion of the cover as a fulcrum. Further, when the duct included in the cover is a first duct and the duct provided on the grill is a second duct, the first duct extends from above the shroud to a front portion of the grill. Thus, in a state where the cover is closed, the front end opening of the first duct and the rear end opening of the second duct are connected in abutment.

  The vehicle front structure according to the above aspect has a configuration in which the cover can be freely opened and closed by dividing the first duct and the second duct. Therefore, the cover can be opened during maintenance, and high maintenance can be ensured.

  In the state where the cover is closed, the traveling wind taken from the front end opening of the second duct is sent to the air-cooled EGR cooler through the first duct. Therefore, the exhaust gas can be reliably cooled during traveling.

  In the vehicle front structure according to another aspect of the present invention, in the above configuration, the air-cooled EGR cooler includes an EGR cooler body attached to the EGR path, and an upper peripheral edge of the EGR cooler body facing upward. A guide member having a projecting guide wall portion.

  The guide wall portion of the guide member is open on the front side and the upper side of the vehicle, and the lower end opening portion of the third duct passes through a portion where the guide wall portion is opened, and the EGR It is arranged toward the cooler body.

  In the vehicle front structure according to this aspect, since the air-cooled EGR cooler has the guide member configured as described above, the wind blown from the lower end opening of the third duct is efficiently blown to the EGR cooler body. become. Therefore, the exhaust gas can be efficiently cooled.

  Moreover, in this aspect, the opening of the guide wall is also provided on the front side of the vehicle. This is for taking in the wind by the radiator fan. Therefore, by taking in the wind from the radiator fan in addition to the traveling wind from the third duct, the exhaust gas can be cooled more effectively.

  In the vehicle front structure according to another aspect of the present invention, the lower end opening of the third duct is located below the upper end edge of the guide wall in the above configuration.

In the vehicle front structure according to this aspect, the lower end opening of the third duct is disposed below the upper end edge of the guide wall, so that traveling wind discharged from the third duct escapes elsewhere. It is sprayed to the air-cooled EGR cooler. Therefore, the exhaust gas can be effectively cooled.
A vehicle front structure according to another aspect of the present invention is arranged on the downstream side in the flow direction of the exhaust gas with respect to the air-cooled EGR cooler in the above configuration, and cools the exhaust gas by heat exchange with a coolant. A liquid-cooled EGR cooler is further provided.
In the vehicle front structure according to the above aspect, in addition to the air-cooled EGR cooler, a liquid-cooled EGR cooler is provided on the downstream side thereof. That is, in this aspect, the exhaust gas discharged from the engine can be cooled by the air-cooled EGR cooler, and then the temperature of the exhaust gas can be lowered by the liquid-cooled EGR cooler. Therefore, in this aspect, it is possible to more effectively suppress the decrease in the air charging efficiency and suppress the decrease in the NOx reduction effect by EGR.

  In the vehicle front structure according to another aspect of the present invention, in the above configuration, the wind guide path is provided with a flapper that performs an opening / closing operation in accordance with the wind pressure of the traveling wind.

  When the wind pressure of the traveling wind is equal to or higher than a predetermined value, the upstream side and the downstream side of the portion where the flapper is provided in the air guide path are in communication, and the wind pressure of the traveling wind is less than the predetermined value. In this case, the air guide path is closed at the place where the flapper is provided.

  In the vehicle front structure according to the above aspect, the flapper that opens and closes due to the wind pressure of the traveling wind is provided in the air guide path, so that heat radiation from the opening of the air guide path can be suppressed while the engine is stopped. . As a result, it is possible to prevent a decrease in the temperature of the engine while the engine is stopped, and to suppress a cold start at the time of restart.

In the vehicle front structure according to another aspect of the present invention, in the above structure, the cover is formed by using a heat insulating / sound absorbing / sound insulating material having a heat insulating property and a sound absorbing / sound insulating property, and the duct is formed. In this portion, the heat insulating / sound absorbing / sound insulating material is compressed in the thickness direction of the cover, so that the heat insulating / sound absorbing / sound insulating material is thinner than the other parts of the cover.

  In the front structure of the vehicle according to the above aspect, even in the portion where the duct is formed in the cover, the heat retaining / sound absorbing / sound insulating material is not removed, but is compressed more than other portions, so Sex is maintained to some extent. Therefore, it is possible to prevent a decrease in the engine temperature while the engine is stopped, and to suppress a cold start at the time of restart.

  In the vehicle front structure according to each aspect described above, even when an air-cooled EGR cooler is disposed behind the engine, the temperature of exhaust gas recirculated to the intake air of the engine can be effectively reduced. .

1 is a schematic perspective view showing a part of a front structure of a vehicle 1 according to a first embodiment. It is a model perspective view which shows the arrangement | positioning form of the air-cooled EGR cooler 14. FIG. 2 is a schematic side view showing an arrangement form of an engine 10, a first duct 16, a second duct 17, and a third duct 18. FIG. It is a model rear view which shows the arrangement | positioning form of the 3rd duct 18 and the air-cooled EGR cooler 14. FIG. FIG. 5 is a diagram schematically showing a VV cross section of FIG. 2, and is a schematic cross sectional view showing a configuration of an upper cover 11. FIG. 2 is a schematic perspective view showing a first duct 16, a second duct 17, a third duct 18, and an air-cooled EGR cooler 14. It is a model perspective view which shows the 3rd duct 28 and the air cooling EGR cooler 24 in the vehicle which concerns on 2nd Embodiment. It is a model perspective view which shows the arrangement | positioning form of the 3rd duct 28 and the air-cooled EGR cooler 24. FIG. 2 is a schematic perspective view showing a configuration of an air-cooled EGR cooler 24. FIG. It is a schematic cross section showing the composition of the 1st duct 36 concerning a modification, (a) shows the state before running wind is taken in, and (b) shows the state where running wind is taken in.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The form described below is one embodiment of the present invention, and the present invention is not limited to the following form except for the essential configuration.

[First Embodiment]
1. Front Structure of Vehicle 1 The front structure of the vehicle 1 according to the present embodiment will be described with reference to FIGS. In FIGS. 1 to 4, a part of the front structure of the vehicle 1 is extracted and illustrated.

  As shown in FIGS. 1, 3, and 4, an engine 10 and an upper cover 11 that covers an upper portion of the engine 10 are disposed in the front portion of the vehicle 1. The engine 10 according to the present embodiment is, for example, a horizontal multi-cylinder diesel engine.

  As shown in FIG. 2, a rear cover 12 that covers the rear wall of the engine 10 is disposed behind the engine 10. And the side cover 13 which covers the side wall of the said engine 10 is arrange | positioned at the both sides of the engine 10 (in FIG. 2, only one side cover 13 is shown in figure).

  As shown in FIG. 4, a gap is provided between the engine 10 and the side cover 13.

  The upper cover 11, the rear cover 12, and the side cover 13 are made of a material having a heat retaining property and a sound absorbing / sound insulating property. That is, after the engine 10 is stopped, it is provided for the purpose of suppressing the temperature drop of the engine 10 and preventing cold start at the time of restart and for the purpose of preventing sound emission to the outside during the start of the engine 10. It has been.

  Although not shown in detail, the engine 10 is provided with an EGR (Exhaust Gas Recirculation) path for recirculating at least a part of the exhaust gas discharged from the engine 10 to the intake side of the engine 10. ing.

  As shown in FIGS. 2 and 3, an air-cooled EGR cooler 14 and a water-cooled EGR cooler 15 are attached to the EGR path. The liquid-cooled EGR cooler 15 is disposed on the downstream side of the exhaust gas flow in the EGR path with respect to the air-cooled EGR cooler 14. The air-cooled EGR cooler 14 is disposed behind the engine 10 as shown in FIGS.

  As shown in FIG. 3, in the air-cooled EGR cooler 14 according to the present embodiment, the surface portion (upper surface portion) that receives the traveling wind is inclined 30 ° to 60 ° from the upper side to the rear side.

  On the other hand, as shown in FIGS. 2 and 3, the water-cooled EGR cooler 15 is disposed on the side of the engine 10 and is covered with a side cover 13.

  As shown in FIG. 3, in the front structure of the vehicle 1, an air guide path is formed to guide the traveling wind taken from the grill 19 to the air-cooled EGR cooler 14. Specifically, the second duct 17, the first duct 16, and the third duct 18 are connected to each other from the front side of the vehicle 1, thereby forming an air guide path.

  The front end of the second duct 17 is located in the grill 19 and extends to the rear side of the vehicle 1. As shown in FIG. 1, the rear end portion of the second duct 17 has a bellows shape. This is to absorb manufacturing variations such as the first duct 16 and the second duct 17, or to suppress transmission of vibration to the grill 19 when the engine 10 is driven.

  Here, the second duct 17 is made of a soft material such as rubber or soft resin. This is from the viewpoint of protecting the pedestrian and the like at the time of collision with the pedestrian and the like.

  As shown in FIGS. 1 to 3, the first duct 16 includes a protruding duct portion 16 a that protrudes toward the vehicle front side from the main body portion of the upper cover 11, and an integrated duct that is formed integrally with the main body portion of the upper cover 11. Part 16b. In other words, the upper cover 11 includes the first duct 16 having the protruding duct portion 16a and the integral duct portion 16b.

  Here, the protruding duct portion 16a of the first duct 16 is not required to have sufficient heat retention and sound absorption / sound insulation properties, but it is a soft material from the viewpoint of protecting pedestrians and the like at the time of collision with pedestrians and the like. For example, it is made of rubber or soft resin.

  As shown in FIG. 1, a portion of the first duct 16 in front of the protruding duct portion 16 a is provided so as to pass above the shroud (radiator support panel) 20.

  As shown in FIG. 3, the first duct 16 is connected in a state in which the front end opening of the protruding duct portion 16 a is butted against the rear end opening of the second duct 17 in a state where the upper cover 11 is closed. . The upper cover 11 has a fulcrum at the rear side of the vehicle 1, and the front side can be opened and closed around the fulcrum.

  The third duct 18 is integrally formed with the rear cover 12. In other words, the rear cover 12 has the third duct 18. The third duct 18 extends in the vertical direction of the vehicle 1 as shown by an arrow A portion in FIG. 4, and is arranged so that the lower end opening 18 a faces the air-cooled EGR cooler 14.

  As shown in FIG. 3, the upper end opening of the third duct 18 is connected to the rear end opening of the integrated duct 16b in the first duct 16 in a state of being butted in a state where the upper cover 11 is closed. .

  The third duct 18 is made of a heat resistant resin. This is to withstand heat from the engine 10 or the exhaust manifold.

2. Configuration of First Duct 16 The configuration of the first duct 16 will be described with reference to FIG. FIG. 5 is a schematic cross-sectional view schematically showing a VV cross section in FIG. 2.

  As shown in FIG. 5, the upper cover 11 has a U shape or a U shape in the cross section. The head portion of the engine 10 is accommodated in the inner space 11 a of the upper cover 11.

  A part of the inner surface of the upper cover 11 facing the space 11a is recessed upward. An integrated duct portion 16b of the first duct 16 is formed in the recessed portion. The integrated duct portion 16 b of the first duct 16 extends in the front-rear direction of the vehicle 1.

  As shown in the enlarged portion on the right side of FIG. 5, the upper cover 11 includes a heat insulating / sound absorbing / sound insulating material 110, a surface skin member 111 covering the front side of the heat insulating / sound absorbing / sound insulating material 110, and a heat insulating / sound absorbing / sound insulating material. A back-side skin member 112 covering the back side of 110 is integrally formed.

As the heat retaining / sound absorbing / sound insulating material 110, for example, artificial ore fibers such as glass wool and rock wool can be used. The thickness _{t 1} of the insulation-absorbing / sound insulation material 110, except for the portion that integrally duct portion 16b is formed in the first duct 16, for example, about 15 to 25 mm.

  As the front side skin member 111 and the back side skin member 112, for example, a thermoplastic resin such as a polyamide-based resin can be used. In addition, as a structure of the front side skin member 111 and the back side skin member 112, when a moldability etc. are considered, it is especially desirable to use the polyamide-type resin film which is an unstretched film.

On the other hand, as shown in the enlarged portion of the left side of FIG. 5, in the portion where the integral duct 16b of the first duct 16 is formed, and the holding-absorbing / sound insulation material 110 is compressed to a thickness t _2. The thickness _{t 2} is, for example, 1.5 to 2.5 mm. Thereby, in the part in which the integral duct part 16b of the 1st duct 16 was formed, the front side skin member 111 does not bulge upward, and the duct wall member 161 which comprises the lower side of the duct 16 is the back side skin member in another part. It does not jump out below 112.

  As shown in a further enlarged portion of the duct wall member 161 in FIG. 5, the duct wall member 161 includes a heat insulating / sound absorbing / sound insulating material 1610 and a duct space side skin covering the duct space side of the heat insulating / sound absorbing / sound insulating material 1610. A member 1611 and a back-side skin member 1612 that covers the back side of the heat insulating / sound absorbing / sound insulating material 1610 are integrally formed.

The heat insulating / sound absorbing / sound insulating material 1610 is formed using the same material as the heat insulating / sound absorbing / sound insulating material 110, for example, artificial ore fibers such as glass wool and rock wool. The thickness t ₃ of the heat insulating / sound absorbing / sound insulating material 1610 is thinner than the thickness t _{2 of the} heat insulating / sound absorbing / sound insulating material 110.

  The duct space-side skin member 1611 and the back-side skin member 1612 are also formed using the same material as the front-side skin member 111 and the back-side skin member 112, for example, a thermoplastic resin such as a polyamide-based resin. Thus, by forming the duct wall member 161 using the same material as that of the upper cover 11, the manufacturing can be facilitated, and the manufacturing cost can be reduced.

  The heat insulation / sound absorption / sound insulation materials 110, 1610 are covered with resin skin members 111, 112, 1611, 1612 because the heat insulation / sound absorption / sound insulation materials 110, 1610 absorb moisture in the air. This is to suppress this.

3. Effects The effects of the front structure of the vehicle 1 according to this embodiment will be described with reference to FIG. FIG. 6 is a schematic perspective view showing the ducts 16 to 18 and the air-cooled EGR cooler 14 extracted from the front structure of the vehicle 1.

  In the vehicle 1 according to this embodiment, the upper cover 11 has a part of the air guide path that guides the traveling wind taken from the grille 19 (not shown in FIG. 6) to the air-cooled EGR cooler 14. 16 (projecting duct portion 16a and integral duct portion 16b). Therefore, even when the gap between the bonnet and the upper cover 11 is narrow, a path for guiding the traveling wind to the air-cooled EGR cooler 14 is ensured.

  In the present embodiment, the third duct 18 is formed integrally with the rear cover 12 (not shown in FIG. 6). As a result, the space behind the engine 10 (not shown in FIG. 2) can be used effectively.

The first duct 16, the second duct 17, and the third duct 18 are connected to each other in a butted state when the upper cover 11 is closed. Therefore, the traveling wind taken from the grill 19 (not shown in FIG. 6) passes from the second duct 17 through the projecting duct portion 16a of the first duct 16 through the integrated duct portion 16b to the third duct 18. It is guided and blown toward the air-cooled EGR cooler 14 (Flow ₁ ).

  Therefore, in the front structure of the vehicle 1 according to the present embodiment, even when the air-cooled EGR cooler 14 is disposed behind the engine 10 (not shown in FIG. 6), the intake air of the engine 10 is restored. The temperature of the exhaust gas to be circulated can be effectively reduced.

  In addition to the air-cooled EGR cooler 14, the EGR path according to the present embodiment is accompanied by a water-cooled EGR cooler 15 on the downstream side. As a result, the exhaust gas discharged from the engine 10 can be subjected to rough heat by the air-cooled EGR cooler 14 and then the temperature of the exhaust gas can be lowered by the water-cooled EGR cooler 15 disposed on the downstream side. Therefore, in the present embodiment, it is possible to more effectively suppress the decrease in the air charging efficiency and suppress the decrease in the NOx reduction effect by EGR.

  Further, in the front structure of the vehicle 1 according to this embodiment, the upper cover 11 can be freely opened and closed by dividing the protruding duct portion 16a of the first duct 16 and the second duct 17 into a split structure. It has become. Therefore, the upper cover 11 can be opened by a simple operation during maintenance, and high maintenance performance can be ensured.

  Further, when the upper cover 11 is closed, the projecting duct portion 16 a of the first duct 16 and the second duct 17 are in communication with each other, and the traveling wind taken from the front end opening of the second duct 17 is in the first duct 16. From the projecting duct portion 16a and the integral duct portion 16b, the air is guided to the air-cooled EGR cooler 14 through the third duct portion 18. Therefore, the exhaust gas can be reliably cooled during traveling.

  As shown in FIG. 5, in the upper cover 11 according to the present embodiment, the heat retaining / sound absorbing / sound insulating material 110 is not removed even in the portion where the integrated duct portion 16 b of the first duct 16 is formed. Since it is only compressed rather than the part, the heat retention in the part is maintained to some extent. Therefore, it is possible to prevent the temperature of the engine 10 from being lowered while the engine 10 is stopped, and to suppress a cold start at the time of restart.

  In the integrated duct portion 16 b of the first duct 16, the duct wall member 161 also has a three-layer structure including a heat insulating / sound absorbing / sound insulating material 1610. For this reason, it becomes possible to suppress the fall of heat retention property and a sound absorption / sound insulation property compared with the other part in the upper cover 11, providing the integrated duct part 16b integral with the upper cover 11. FIG.

[Second Embodiment]
A vehicle front structure according to the second embodiment will be described with reference to FIGS. The vehicle front structure according to this embodiment is the same as that of the first embodiment except for the structure of the third duct 28 and the structure of the air-cooled EGR cooler 24. Description is omitted.

  As shown in FIG. 7, the duct 28 according to the present embodiment has a configuration in which the air guide path is extended to the lower air-cooled EGR cooler 24 side than the third duct 18 according to the first embodiment. As shown in FIG. 8, the lower end opening 28 a of the third duct 28 is located immediately above the surface portion that receives the traveling wind in the air-cooled EGR cooler 24.

  In addition, although illustration is abbreviate | omitted in FIG. 7, the 3rd duct 28 is integrally molded by the back cover 12, and the B part protrudes below.

  As shown in FIG. 8, the air-cooled EGR cooler 24 according to this embodiment includes an EGR cooler body 241 and a guide member 242 fixed to the outer periphery thereof. The EGR cooler body 241 has the same configuration as the air-cooled EGR cooler 14 according to the first embodiment.

  The guide member 242 has a guide wall portion that protrudes upward from the outer peripheral edge of the upper portion of the EGR cooler main body 241. The guide wall portion is erected from three outer peripheral edges excluding the front side of the four outer peripheral edges of the EGR cooler main body 241.

  Further, in the guide member 242, the guide wall portion has a shape that is expanded in a flare shape at the upper portion, and the upper portion is opened. That is, the guide wall portion of the guide member 242 has the opening 232b on the front side and the upper side.

  Here, the lower end opening portion 28a of the third duct 28 is disposed below the upper end edge 242a of the guide wall portion.

In the vehicle front structure according to the present embodiment having the above-described configuration, as shown in FIG. 9, the traveling wind Flow ₂ ejected from the lower end opening 28 a of the third duct 28 is separated by the guide member 242. The EGR cooler body 241 is sprayed without running away.

In the present embodiment, since the lower end opening 28a of the third duct 28 is disposed below the upper end edge 242a of the guide wall portion, the traveling wind Flow ₂ discharged from the third duct 28 is highly efficient. The EGR cooler main body 241 is sprayed to the exhaust gas so that the exhaust gas can be effectively cooled.

Moreover, as shown in FIG. 9, in the guide member 242, the opening part 242b of a guide wall part is provided also in the front side of the vehicle. This is for taking in the wind by the radiator fan. Therefore, in addition to the traveling wind sent through the third duct 28, the EGR cooler main body 241 can take in the wind (Flow ₃ ) from the radiator fan, thereby further effectively cooling the exhaust gas. Become.

[Modification]
The configuration of the duct 36 according to the modification will be described with reference to FIG. FIGS. 10A and 10B are schematic cross-sectional views showing a partial configuration of the duct 36 for guiding the traveling wind. The first duct 36 is a part corresponding to the first duct 16 according to the first embodiment.

  As shown in FIG. 10A, a flapper 362 that is rotatably supported by a duct wall member 360 by a hinge portion 362 a is provided inside the first duct 36. The flapper 362 has a state in which the end 362b is in contact with the inner surface 361a of the duct wall member 361 as shown in FIG. 10A, and the end 362b extends from the inner surface 361a of the duct wall member 361 as shown in FIG. The separated state is configured to change according to the wind pressure of the traveling wind introduced.

  That is, as shown in FIG. 10A, when the vehicle is stopped or moving forward at a slow speed, the flapper 362 closes the duct 3. Thereby, it is possible to suppress the heat Ha of the engine 10 from being radiated to the outside through the duct 36.

On the other hand, as shown in FIG. 10 (b), when the vehicle is traveling and the wind pressure of the traveling wind Flow ₄ introduced into the first duct 36 exceeds a predetermined value, the flapper 362 is opened and the duct 36 is opened. Will be in communication. Thereby, the running wind taken in from the grill 19 is blown to the air-cooled EGR coolers 14 and 24, and the exhaust gas is cooled.

As described above, in the front structure of the vehicle according to the present modification, the flapper 362 that opens and closes by the wind pressure of the traveling wind Flow ₄ is provided in the duct 36. Therefore, when the engine 10 is stopped, the first duct 36 Heat dissipation from the opening can be suppressed. Thereby, it is possible to prevent the temperature of the engine 10 from being lowered while the engine 10 is stopped, and to suppress a cold start at the time of restart.

  The vehicle front structure according to this modification has the same configuration as that of the first embodiment or the second embodiment except for the portion described with reference to FIG. Can do.

[Other variations]
In the said 1st Embodiment, the said 2nd Embodiment, and the said modification, although it decided to employ | adopt a horizontal diesel engine as an example of the engine 10, this invention is not limited to this. For example, it is possible to adopt a gasoline engine or to arrange the engine vertically.

  Moreover, in the said 1st Embodiment, the said 2nd Embodiment, and the said modification, the airflow path of the driving | running | working wind sprayed on the air cooling EGR coolers 14 and 24 is comprised using the three ducts 16-18,36. However, the present invention is not limited to this. For example, the air guide path may be configured by connecting two or less ducts, or the air guide path may be configured by connecting four or more ducts.

  Moreover, in the said 1st Embodiment, the said 2nd Embodiment, and the said modification, the form which has arrange | positioned the front-end | tip of the 2nd duct 17 in the grille 19 was employ | adopted, However, This invention is not limited to this. Absent. For example, it is possible to open an opening in a part of the front bumper and take in the traveling wind from the opening.

  Moreover, in the said 1st Embodiment, the said 2nd Embodiment, and the said modification, although it was supposed that one air guide path was comprised by the three ducts 16-18,36 communicating, this invention. Is not limited to this. A plurality of ducts may be provided in the front part of the vehicle, and these may be assembled into one or more ducts to blow air to the air-cooled EGR coolers 14 and 24. Moreover, about one of the several duct arrange | positioned at the front part of a vehicle, a front-end opening part can also be arrange | positioned immediately after a radiator fan. Thereby, even when the vehicle is stopped, as long as the radiator fan is operating, the air can be sent to the air-cooled EGR coolers 14 and 24.

  Moreover, in the said 1st Embodiment, the said 2nd Embodiment, and the said modification, although the structure which can open and close the upper cover 11 was employ | adopted, this invention is not limited to this. For example, a configuration in which the upper cover is fixed to the vehicle body with bolts or rivets may be employed. Thus, when employ | adopting the upper cover fixed to the vehicle body, between ducts can be fixed.

  Moreover, in the said 1st Embodiment, the said 2nd Embodiment, and the said modification, although the structure formed integrally with the back cover 12 was employ | adopted also about the ducts 18 and 28, this invention receives a limitation to this. It is not a thing. For example, when a space can be secured behind the engine 10, a separate duct may be attached to the outside of the rear cover 12.

  In the second embodiment, the guide member 242 in the air-cooled EGR cooler 24 has a configuration in which the front side is simply opened. However, the present invention is not limited to this. For example, a duct continuing from the rear of the radiator fan can be connected to the front side. Thereby, the wind from the radiator fan can be reliably blown to the EGR cooler main body 241, and the exhaust gas can be cooled even when the vehicle is stopped.

  In the second embodiment, as the guide member 242 in the air-cooled EGR cooler 24, a configuration in which guide wall portions are erected from the outer edge portions on the three sides in the upper portion of the EGR cooler main body 241 is adopted. This is not a limitation. For example, an opening may be provided in the rear guide wall so that the flow of wind can be improved.

  Moreover, in the said modification, the flapper 362 which opens and closes according to the wind pressure of the running wind introduce | transduced into the duct 36 was employ | adopted, However, This invention is not limited to this. For example, a flapper that opens and closes in response to ON / OFF of an ignition switch of the vehicle may be employed.

  As shown in FIG. 5, in the upper cover 11, the heat insulating and sound absorbing / sound insulating material 110 is compressed from the inner surface side toward the outer surface side in the portion where the integrated duct portion 16 b of the first duct 16 is provided. However, the present invention is not limited to this. For example, the heat retaining / sound absorbing / sound insulating material 110 may be compressed from the outer surface side to the inner surface side, and the integrated duct portion 16b of the first duct 16 may be provided from the outside to the compressed portion. In the case of such a configuration, the heat insulating and sound absorbing / sound insulating material 110 is interposed between the integrated duct portion 16b of the first duct 16 and the inner surface of the upper cover 11, which is referred to as heat insulating and sound absorbing / sound insulating. Excellent from the viewpoint.

  Moreover, in the said 1st Embodiment, the said 2nd Embodiment, and the said modification, about the 1st ducts 16 and 36 in the upper cover 11, the structure where the perimeter of the cross section was enclosed was employ | adopted, but this invention is This is not a limitation. For example, a U-shaped cross section or a U-shaped cross section in which one side is opened may be used. Even with such a configuration, the traveling wind can be guided to the air-cooled EGR coolers 14 and 24.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Engine 11 Upper cover 14,24 Air-cooled EGR cooler 15 Water-cooled EGR cooler 16,36 1st duct 17 2nd duct 18,28 3rd duct 241 EGR cooler main body 242 Guide member 362 Flapper

Claims (9)

In the front structure of the vehicle,
Engine,
A cover that covers an upper side of the vehicle in the engine and has a duct;
An EGR path that is a path for recirculating at least part of exhaust gas discharged from the engine to the intake side of the engine;
An air-cooled EGR cooler that is disposed on the rear side of the vehicle with respect to the engine and that cools the exhaust gas flowing in the EGR path by receiving traveling wind;
A shroud disposed on the front side of the vehicle with respect to the engine;
A grill disposed on the front side of the vehicle with respect to the shroud;
A duct provided in the grill;
With
At least a part of the air guide path, which is a path that takes in the traveling wind from the front of the vehicle and guides the captured traveling wind to the air-cooled EGR cooler, is configured by the duct in the cover .
When the duct included in the cover is a first duct and the duct provided in the grill is a second duct,
The cover is openable and closable with the rear part of the cover as a fulcrum,
The first duct extends from above the shroud to a front portion of the grill,
In a state where the cover is closed, a front end opening of the first duct and a rear end opening of the second duct are connected in a butt-contact state.
Vehicle front structure. The vehicle front structure according to claim 1 ,
A rear cover for covering the rear wall side of the engine,
The rear cover has a duct that constitutes a part of an air guide path from a rear end of the duct of the cover to the air-cooled EGR cooler,
When the duct that the cover has is a first duct and the duct that the rear cover has is a third duct,
In the state where the cover is closed, the rear end opening of the first duct and the upper end opening of the third duct are connected in a butted state.
Vehicle front structure. In the front structure of the vehicle,
An engine,
A cover that covers an upper side of the vehicle in the engine and has a duct;
An EGR path that is a path for recirculating at least part of exhaust gas discharged from the engine to the intake side of the engine;
An air-cooled EGR cooler that is disposed on the rear side of the vehicle with respect to the engine and that cools the exhaust gas flowing in the EGR path by receiving traveling wind;
A rear cover covering the rear wall side of the engine;
With
At least a part of the air guide path, which is a path that takes in the traveling wind from the front of the vehicle and guides the captured traveling wind to the air-cooled EGR cooler, is configured by the duct in the cover.
The rear cover has a duct that constitutes a part of an air guide path from a rear end of the duct of the cover to the air-cooled EGR cooler,
When the duct that the cover has is a first duct and the duct that the rear cover has is a third duct,
In the state where the cover is closed, the rear end opening of the first duct and the upper end opening of the third duct are connected in a butted state.
Vehicle front structure. A vehicle front structure according to claim 3 ,
A shroud disposed on the front side of the vehicle with respect to the engine;
A grill disposed on the front side of the vehicle with respect to the shroud;
A duct provided in the grill;
Further comprising
When the duct included in the cover is a first duct and the duct provided in the grill is a second duct,
The cover is openable and closable with the rear part of the cover as a fulcrum,
The first duct extends from above the shroud to a front portion of the grill,
In a state where the cover is closed, a front end opening of the first duct and a rear end opening of the second duct are connected in a butt-contact state.
Vehicle front structure. A vehicle front structure according to claim 3 or claim 4,
The air-cooled EGR cooler includes an EGR cooler body attached to the EGR path, and a guide member having a guide wall portion protruding upward from an outer peripheral edge of an upper portion of the EGR cooler body,
The guide wall portion of the guide member is open on the front side and the upper side of the vehicle,
The lower end opening of the third duct is disposed toward the EGR cooler body through a portion where the guide wall is opened.
Vehicle front structure. The vehicle front structure according to claim 5,
The lower end opening of the third duct is below the upper end edge of the guide wall,
Vehicle front structure. A vehicle front structure according to any one of claims 1 to 6 ,
A liquid-cooled EGR cooler that is disposed downstream of the air-cooled EGR cooler in the flow direction of the exhaust gas and cools the exhaust gas by heat exchange with a coolant;
Vehicle front structure. A vehicle front structure according to any one of claims 1 to 7 ,
The wind guide path is provided with a flapper that performs an opening and closing operation according to the wind pressure of the traveling wind,
When the wind pressure of the traveling wind is a predetermined value or more, the upstream side and the downstream side of the flapper in the air guide path are in communication with each other,
When the wind pressure of the traveling wind is less than the predetermined value, the air guide path is closed at a location where the flapper is provided.
Vehicle front structure. A vehicle front structure according to any one of claims 1 to 8 ,
The cover is formed using a heat insulating / sound absorbing / sound insulating material having heat retaining properties and sound absorbing / sound insulating properties,
In the portion where the duct is formed, the heat insulating / sound absorbing / sound insulating material is compressed in the thickness direction of the cover, so that the thickness of the heat insulating / sound absorbing / sound insulating material becomes thinner than the other part of the cover. ing,
Vehicle front structure.

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