JP5003950B2 - Vehicle powertrain arrangement structure - Google Patents

Description

  The present invention relates to a vehicle powertrain arrangement structure, and more particularly, a vehicle powertrain of a vehicle in which a vehicle compartment and an engine room are partitioned by a dash panel, and a powertrain for driving wheels is arranged in the engine room. The present invention relates to an arrangement structure.

  2. Description of the Related Art Conventionally, there has been known a vehicle in which a recess that is recessed toward the rear of the vehicle is formed in the dash panel of the vehicle, and a power train that includes an engine and a transmission is disposed on the engine room side of the recess. In a vehicle having such an arrangement, the engine (heavy object) can be brought closer to the center of the vehicle by arranging the powertrain engine as far back as possible in the engine room. Thereby, the yaw moment of inertia generated in the vehicle can be reduced, and the running stability of the vehicle can be improved. In the vehicle having such an arrangement, the transmission connected to the engine is located behind the engine, and is disposed outside the tunnel portion formed on the floor panel along the front-rear direction of the vehicle. In addition, exhaust system accessories such as an exhaust pipe and a catalyst extending from the engine are also disposed outside the tunnel portion.

  FIG. 13 shows a cross-sectional view of the tunnel portion 102 of the conventional vehicle 100. As shown in FIG. 13, when the exhaust system auxiliary equipment 104 disposed in the tunnel portion 102 is a relatively large part, if the exhaust system auxiliary equipment 104 is disposed in the vicinity of the transmission 106, the tunnel section 102 includes In addition, an extra recess 108 for the exhaust system auxiliary machine 104 must be provided. For this reason, in the tunnel portion 102, the portion where the exhaust system auxiliary machine 104 is provided is raised upward by the recess 108. Here, since the tunnel portion 102 is positioned beside the occupant seat 110 provided on the left and right sides of the passenger compartment, when the concave portion 108 is formed in the tunnel portion 102, the floor surface of the mounting space for the occupant seat 110 is directed upward. It will protrude. Therefore, the occupant seat 110 must be disposed above the recess 108 so as not to interfere with the recess 108, and the position of the occupant seat 110 is increased. This is disadvantageous in a sport-type vehicle in which a lower vehicle height is preferred because the degree of freedom in design is low. For example, when the exhaust system auxiliary equipment is a catalyst, heat generated by the on-board catalyst is transferred to the vehicle interior via the tunnel portion, and the air conditioning efficiency of the vehicle interior is deteriorated.

  Therefore, an arrangement structure in an engine room in which an exhaust system auxiliary machine such as a catalyst is arranged in front of the engine has been proposed (for example, Patent Documents 1-3). In these arrangement structures described in Patent Documents 1-3, the exhaust system auxiliary machine is arranged in front of the engine in the engine room. With such an arrangement, it is possible to reduce the number of components arranged in the tunnel portion while securing the arrangement in which the engine is arranged in the recess of the engine room and moved toward the center of the vehicle. Further, since the tunnel portion does not protrude toward the passenger compartment, the passenger seat height can be reduced. Furthermore, even if a catalyst is considered as an exhaust system auxiliary machine, for example, the catalyst is placed in front of the engine, so heat transfer to the passenger compartment can be reduced, improving the comfort in the passenger compartment. Can be made.

JP 2003-326981 A JP 2005-028911 A JP 2005-029057 A

  However, in such an exhaust system auxiliary device arrangement structure, the number of devices arranged in the tunnel portion is reduced, but on the other hand, the number of devices arranged in the engine room is increased. Here, the engine room occupies a space in front of the vehicle, and the space occupied by the engine room greatly affects the design of the vehicle. Therefore, in order to raise the freedom degree of design of a vehicle, the apparatus in an engine room needs to be arrange | positioned compactly. Further, it is necessary to effectively dissipate the equipment in the engine room while arranging the equipment in the engine room in a compact manner.

  An object of the present invention is to provide a vehicle powertrain arrangement structure in which the powertrain of the vehicle can be arranged in a compact manner and can effectively dissipate heat in the engine room.

  In order to achieve the above object, the present invention is a vehicle power train arrangement structure in which a vehicle compartment and an engine room are partitioned by a dash panel, and a power train for driving wheels is arranged in the engine room. The dash panel is formed with a recess recessed toward the passenger compartment. The power train is a longitudinal engine disposed in the recess and a transmission connected to the rear of the engine, and disposed in front of the engine. It has a heat exchanger and an exhaust system auxiliary machine that extends from the engine and is disposed above the heat exchanger.

In the present invention configured as described above, since the exhaust system auxiliary machine is disposed above the heat exchanger, the size of the engine room in the front-rear direction can be shortened. Therefore, the devices can be arranged in a compact manner in the engine room, and the degree of freedom in designing the vehicle can be increased.
Further, since the exhaust system auxiliary machine is disposed above the heat exchanger, the exhaust system auxiliary machine can escape upward in the engine room at the time of a vehicle front collision. Therefore, the exhaust system auxiliary machine can be prevented from being crushed by the heat exchanger or other equipment in the engine room, and thus the exhaust system auxiliary machine can be prevented from being damaged.
Furthermore, since the exhaust system auxiliary machine is disposed above the heat exchanger, heat can be radiated from the upper side of the exhaust system auxiliary machine. That is, since the lower end of the engine room is usually covered with an under cover, it is difficult for air to enter. For this reason, when the exhaust system auxiliary equipment is disposed below, hot air tends to accumulate in the lower part of the engine room. In the present invention, since the exhaust system auxiliary machine is disposed above the heat exchanger, the heat generated by the exhaust system auxiliary machine can be released to the upper side of the engine room, and heat is effectively dissipated. be able to.

In the present invention, the exhaust system auxiliary machine is preferably disposed in front of the heat exchanger.
In the present invention configured as described above, since the exhaust system auxiliary machine is arranged in front of the heat exchanger, the exhaust system auxiliary machine can be arranged further from the engine. Therefore, it is possible to prevent heat from being trapped between the exhaust system auxiliary machine and the engine, so that heat dissipation in the engine room is effectively performed.

In the present invention, preferably, the heat exchanger is disposed so as to be inclined at a predetermined angle toward the front.
In the present invention configured as described above, since the heat exchanger is arranged to be inclined at a predetermined angle toward the front, the height dimension of the engine room can be reduced. Accordingly, the bonnet height can be lowered, thereby increasing the degree of freedom in designing the vehicle. In addition, for example, when the exhaust system auxiliary equipment is arranged in front of the heat exchanger, the heat exchanger is arranged closer to the exhaust system auxiliary equipment by being inclined toward the front side. Arranged. Therefore, the heat exchanger may also enable heat exchange of the exhaust system auxiliary equipment, and efficient heat dissipation is performed.

In the present invention, preferably, the heat exchanger is disposed so as to be inclined at a predetermined angle toward the rear.
In the present invention configured as described above, since the heat exchanger is disposed to be inclined at a predetermined angle toward the rear, the height dimension of the engine room in the engine room can be reduced. Accordingly, the bonnet height can be lowered, thereby increasing the degree of freedom in designing the vehicle. In addition, for example, when the exhaust system auxiliary equipment is disposed in front of the heat exchanger, the heat exchanger is disposed to be inclined rearward so that the heat exchanger is moved away from the exhaust system auxiliary equipment. Arranged. Therefore, it is possible to prevent heat from being trapped between the heat exchanger and the exhaust system auxiliary machine.

In the present invention, preferably, the heat exchanger includes a plurality of heat exchanger units having different sizes as viewed from the front-rear direction and arranged so as to overlap at least partially when viewed from the front-rear direction. The machine is arranged so that at least a part of the large heat exchanger unit of the plurality of heat exchanger units overlaps with the front-rear direction, and the small heat exchanger unit of the plurality of heat exchanger units. When viewed from above and below, at least a portion is disposed.
In the present invention configured as described above, the exhaust system auxiliary machine is disposed so that at least a part of the plurality of heat exchanger units overlaps with the large heat exchanger unit when viewed from the front-rear direction, and is small. Since the heat exchanger unit is arranged so that at least a part of the heat exchanger unit overlaps with the heat exchanger unit in the vertical direction, it is possible to arrange the exhaust system auxiliary equipment in the space generated by the difference in the size of the plurality of heat exchanger units. it can. Accordingly, the equipment in the engine room can be arranged in a compact manner, thereby increasing the degree of freedom in designing the vehicle.

In the present invention, preferably, the heat exchanger includes at least a radiator that cools the engine, a condenser that performs heat exchange of the in-vehicle air conditioner, and a fan that cools the radiator and the condenser. The heat exchanger unit is a fan.
In the present invention configured as described above, the heat exchanger includes at least a radiator, a condenser, and a fan, and the large heat exchanger unit is a fan. When viewed from the front-rear direction, at least a portion is overlapped. Therefore, the radiator and the condenser can be cooled by the fan, and the exhaust system auxiliary machine can be cooled, so that the heat in the engine room can be efficiently released.

In the present invention, the exhaust system auxiliary machine is preferably a catalyst.
In the present invention configured as described above, since the exhaust system auxiliary machine is a catalyst, the heat generated by the catalyst is efficiently radiated by arranging the catalyst above the heat exchanger. can do.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the second and subsequent embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be simplified or omitted.

[First Embodiment]
First, a vehicle powertrain arrangement structure according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view showing a front portion of a vehicle according to the first embodiment of the present invention, FIG. 2 is a plan view showing the front portion of the vehicle according to the first embodiment of the present invention, and FIG. FIG. 4 is a front view showing a front portion of the vehicle according to the first embodiment of the present invention, and FIG. 4 is a view showing a cross section of the tunnel portion of the vehicle according to the first embodiment of the present invention.

  The vehicle 1 includes a vehicle compartment 2 that is a space in which a passenger enters, and an engine room 4 disposed in front of the vehicle compartment 2. The vehicle compartment 2 and the engine room 4 are partitioned by a dash panel 6.

  A recessed portion 8 that protrudes toward the vehicle compartment 2 side, that is, recessed in the engine room 4, is formed at the substantially center of the dash panel 6 in the vehicle width direction. The recess 8 accommodates a portion on the rear side of the engine 10 and a portion on the front side of the transmission 12 connected to the rear of the engine 10. With such an arrangement, the engine 10 has the center of gravity of the engine 10 located behind the axle 11 </ b> A of the front wheel 11 of the vehicle 1. Here, in this embodiment, the engine 10 is a vertical engine, preferably a rotary engine. Further, the engine 10 and the transmission 12 are provided, and a power train that drives a rear wheel (not shown) is configured.

A floor panel 14 is connected to the lower end of the dash panel 6. A tunnel portion 16 that protrudes upward along the front-rear direction of the vehicle 1 is formed at the approximate center in the vehicle width direction of the floor panel 14. On the vehicle outer side of the tunnel portion 16, there are provided a rear portion of the transmission 12 and a propeller shaft 18 that is disposed behind the transmission 12 and is connected to the transmission 12 via a universal joint (not shown). . Therefore, the transmission 12 and the propeller shaft 18 are located above the floor panel 14.
A windshield 20 is connected to the upper end of the dash panel 6.

  A seat 22 on which a passenger 23 sits is attached to the floor panel 14 in the passenger compartment 2. These sheets 22 are arranged on both sides in the width direction of the tunnel portion 16 of the floor panel 12 with the tunnel portion 16 interposed therebetween. Therefore, when the occupant 23 sits on the seat 22, the tunnel portion 16, and the transmission 12 and the propeller shaft 18 disposed on the vehicle exterior side of the tunnel portion 16 are positioned adjacent to the buttocks and lower limbs of the occupant 23. .

  The engine room 4 is divided by a dash panel 6 at the rear, and an under cover 24 is disposed below. The upper opening of the engine room 4 is covered with a hood 26 so as to be opened and closed. A front grille 28 is provided in front of the engine room 4 to take in the traveling wind into the engine room 4 when the vehicle 1 is traveling. Behind the engine room 4, the engine 10 described above is disposed in the recess 8 of the dash panel 6.

  In the engine room 4 of the vehicle 1, left and right front side frames 30 extending in the front-rear direction of the vehicle 1 are provided. A bumper reinforcement 32 is fixed to the front ends of these front side frames 30. The rear end of the front side frame 30 is coupled to the side sill 34 (FIG. 2) directly or via a torque box (not shown). These frames 30, 32, and 34 have a closed cross section and are vehicle body rigidity members for ensuring the vehicle body rigidity of the front portion of the vehicle 1.

Next, an arrangement structure of devices in the engine room 4 will be described.
An intake pipe (not shown) is connected to the upper surface of the engine 10. An exhaust pipe 36 is connected to one side surface 10A of the side surfaces of the engine 10 in the vehicle width direction. The exhaust pipe 36 is bent at a right angle from the first exhaust pipe 38 in front of and above the upper end of the engine 10 and a first exhaust pipe 38 extending forward and upward from the side surface 10A of the engine 10 along the longitudinal direction of the vehicle 1. A second exhaust pipe 40 extending to the other side surface 10B of the engine 10 along the vehicle width direction, a right angle bent from the second exhaust pipe 40 and extending rearward and downward, and extending along the front-rear direction of the vehicle 1 And a third exhaust pipe 42 that passes through the vicinity of the side surface 10B and extends to the tunnel portion 16. A rear end of the third exhaust pipe 42 is connected to a fourth exhaust pipe 44 disposed in the tunnel portion 16 and extending rearward of the vehicle 1 along the front-rear direction of the vehicle 1.

In the middle of the second exhaust pipe 40, a catalyst 46, which is an exhaust gas purification device carrying a catalyst for purifying exhaust gas from the engine 10, is attached. The catalyst 46 is a cylindrical member extending along the vehicle width direction. With this arrangement, the catalyst 46 is arranged forward and upward with respect to the engine 10. Further, the catalyst 46 is positioned in front of the front end 26 </ b> A of the hood 26, that is, in front of the front edge portion 27 of the upper opening of the engine room 4.
As shown in FIG. 4, the fourth exhaust pipe 44 is disposed below and to the side of the transmission 12 and the propeller shaft 18.

  The first exhaust pipe 38 and the third exhaust pipe 42 extend along the front-rear direction of the vehicle 1 inside the left and right front side frames 30. Accordingly, the second exhaust pipe 40 and the catalyst 46 attached in the middle thereof are disposed between the left and right front side frames 30. The center 46A of the cross section of the catalyst 46 is disposed above the upper end of the front side frame 30.

  A heat exchanger 48 for exchanging heat with equipment in the engine room 4 is provided in front of the engine 10. The heat exchanger 48 includes a plurality of heat exchanger units. In the present embodiment, the radiator 50 that cools the engine 10, the condenser 52 for air conditioning equipment, and the fan 54 that cools the radiator 50 and the condenser 52. And. The fan 54 is disposed in front of the engine 10, the radiator 50 is disposed in front of the fan 54, and the condenser 52 is disposed in front of the radiator 50. Thereby, the fan 54, the radiator 50, and the capacitor | condenser 52 are arrange | positioned adjacent to each other in the front-back direction.

  The heat exchanger 48, that is, the fan 54, the radiator 50, and the condenser 52 are disposed between the left and right front side frames 30. The radiator 50 and the capacitor 52 are disposed such that the upper ends thereof are positioned below the upper end of the front side frame 30. Further, the fan 54 extends upward through the space between the left and right front side frames 30, and the upper end thereof is disposed above the upper end of the front side frame 30.

These fans 54, radiators 50, and condensers 52 are each inclined toward the front so that the upper ends thereof are located in front of the vehicle 1 with respect to the lower ends. The inclination angles of these devices are almost equal to each other.
The fan 54, the radiator 50, and the condenser 52 are different in size from the front-rear direction of the vehicle 1. That is, the vertical dimension of the fan 54 is formed larger than the vertical dimension of the radiator 50, and the upper part of the fan 54 extends upward between the first exhaust pipe 38 and the third exhaust pipe 42. , And arranged adjacent to the rear of the catalyst 46.
On the other hand, the vertical dimension of the radiator 50 is formed smaller than the vertical dimension of the fan 54, and the radiator 50 is disposed adjacent to the lower front portion of the fan 54, and the under cover 24 is disposed below the engine room 4. Placed close together. Further, the vertical dimension of the capacitor 52 is smaller than the vertical dimension of the radiator 50, and the capacitor 52 is disposed adjacent to the lower front part of the radiator 50. Here, the radiator 50 and the capacitor 52 are located below the catalyst 46.

  With this arrangement, the catalyst 46 is disposed in front of the fan 54 and above the radiator 50 and the capacitor 52. That is, the center 46A of the cross section of the catalyst 46 is located in front of the front surface of the fan 54, and the catalyst 46 overlaps the fan 54 when viewed in the front-rear direction. Further, the cross-sectional center 46A of the catalyst 46 is located above the upper end of the radiator 50 and the upper end of the capacitor 52, and the catalyst 46 overlaps the radiator 50 and the capacitor 52 when viewed in the vertical direction of the vehicle 1. ing. As described above, the catalyst 46 is disposed in a surplus space formed by the difference in size of the plurality of heat exchanger units of the heat exchanger 48 above the radiator 50 and the condenser 52. In addition, since the fan 54 is inclined forward, the upper part of the fan 54 is closer to the catalyst 46 than in the case where the fan 54 is arranged vertically.

In such a power train arrangement structure in the engine room 4, when the vehicle 1 travels, the traveling wind taken from the front grill 28 strikes the condenser 52 and the radiator 50, thereby radiating heat. Further, since the catalyst 46 is disposed in the course of the passage of the traveling wind from the front grill 28, the traveling wind taken from the front grill 28 also dissipates heat from the catalyst 46 while the vehicle 1 is traveling. .
When the vehicle 54 travels at a low speed or stops, when the fan 54 rotates to cool the radiator 50 and the condenser 52, the fan 54 also sucks air around the catalyst 46, as indicated by an arrow A in FIG. The heat of the catalyst 46 is also performed.

Next, functions and effects of the vehicle powertrain arrangement structure according to this embodiment having the above-described structure will be described.
Since the catalyst 46 is disposed in front of the engine 10 in the engine room 4, unlike the conventional vehicle, the catalyst is not provided in the middle of the fourth exhaust pipe 44. Therefore, in the vehicle 1 according to the present embodiment, unlike the arrangement of the conventional exhaust system auxiliary machine 104 and the shape of the tunnel portion 102 as shown in FIG. There is no need to form an additional recess for the catalyst 46 in the tunnel portion 16. Further, since no recess is formed in the tunnel portion 16, the seat 22 is directly mounted on the floor panel 14 in the vehicle 1 of the present embodiment. Therefore, the position of the sheet 22 can be lowered compared to the case shown in FIG. Thereby, the freedom degree of design of the vehicle 1 can be raised.

  Further, since the catalyst 46 is disposed in the engine room 4, it is possible to prevent heat generated by the exhaust gas purification action from being transmitted to the vehicle compartment 2 through the tunnel portion 16. Therefore, since the temperature rise in the passenger compartment 2 can be prevented, the comfort in the passenger compartment 2 can be improved.

The catalyst 46 is disposed above the radiator 50 and the capacitor 52 so that the catalyst 46 is disposed far from the under cover 24. Therefore, compared with the case where the catalyst 46 is disposed close to the under cover 24, the heat generated in the catalyst 46 is not trapped in the engine room 4 and can be radiated more efficiently. Further, since the traveling wind sent from the front grille 28 easily hits the catalyst 46, the catalyst 46 can dissipate heat while the vehicle 1 is traveling.
Further, by disposing the catalyst 46 above the radiator 50 and the capacitor 52, it is possible to dispose the equipment by utilizing the remaining space above the radiator 50 and the capacitor 52. Therefore, the devices in the engine room 4 can be arranged in a compact manner, and the degree of freedom in designing the vehicle 1 can be increased.

Further, since the fan 54 extends above the radiator 50 and is disposed behind the catalyst 46, the radiator 50 can be cooled by the operation of the fan 54, and at the same time, the heat dissipation of the catalyst 46 can be promoted. .
Further, since the catalyst 46 is provided in the course of the travel wind passage, heat can be dissipated by the travel wind taken from the front grill 28 while the vehicle 1 is traveling.

Since the heat exchanger 48 is disposed to be inclined toward the front, the vertical dimension of the heat exchanger 48 can be reduced, so that the bonnet height can be reduced. Therefore, the equipment in the engine room 4 can be arranged in a compact manner, and thereby the degree of freedom in designing the vehicle 1 can be increased.
Further, since the heat exchanger 48 is tilted forward, the fan 54 is disposed at a position closer to the catalyst 46 in the heat exchanger 48. Therefore, when the fan 54 is driven, the heat around the catalyst 46 can be easily sucked by the fan 54, and the heat dissipated around the catalyst 46 can be more effectively performed.

Since the catalyst 46 is disposed above the front side frame 30, when the bumper reinforcement 32 and the front side frame 30 are compressed during a frontal collision of the vehicle 1, the catalyst 46 escapes upward. It is possible to avoid compression by the bumper reinforcement 32 or the like. Therefore, damage to the catalyst 46 due to the collision of the vehicle 1 can be suppressed to a minimum.
In addition, since the catalyst 46 is disposed above the radiator 50 and the capacitor 52, it is possible to prevent the catalyst 46 from being crushed by the radiator 50 and the capacitor 52 when the vehicle 1 collides forward. .

  Since the catalyst 46 is disposed in front of the front end 26A of the bonnet 26, the operator contacts the catalyst 46 when the hood 26 is opened and a hand is inserted during maintenance of the vehicle 1 or the like. Can be prevented.

  Since the engine 10 is disposed in the recess 8 of the dash panel 6, the engine 10 can be disposed further rearward and closer to the center of the vehicle. Therefore, the yaw moment of inertia of the vehicle 1 can be reduced, and the response of the vehicle 1 to steering can be improved.

[Second Embodiment]
Next, a vehicle powertrain arrangement structure according to a second embodiment of the present invention will be described with reference to FIG. The vehicle powertrain arrangement structure according to the second embodiment has the same structure as the vehicle powertrain arrangement structure according to the first embodiment except that the configuration and arrangement of the heat exchanger are different.

  FIG. 5 is a side sectional view showing the front portion of the vehicle 60 according to the second embodiment of the present invention. The heat exchanger 62 of the vehicle 60 includes a radiator 64, a condenser 66 for in-vehicle air conditioning, and a fan 68 that cools the radiator 64 and the condenser 66. The heat exchanger 62 is disposed in front of the engine 10. A fan 68 is disposed in front of the engine 10, a radiator 64 is disposed in front of the fan 68, and a condenser 66 is disposed in front of the radiator 64.

  The heat exchanger 62 is disposed in the lower part of the engine room 4 in the vicinity of the under cover 24, and the upper ends of the radiator 64, the fan 68, and the condenser 66 are positioned below the upper end of the catalyst 46. In addition, it is located below the cross-sectional center 46A of the catalyst 46. That is, the catalyst 46 is disposed above the radiator 64, the condenser 66, and the fan 68. Further, the upper ends of the radiator 64 and the fan 68 are located above the upper end of the front side frame 30, and the upper end of the capacitor 66 is located below the upper end of the front side frame 30. In the present embodiment, the vertical dimension of the fan 68 is set substantially equal to the vertical dimension of the radiator 64.

  Each of the heat exchangers 62 is disposed so as to be inclined rearward so that the upper end is located behind the lower end. Therefore, the heat exchanger 62 is disposed away from the catalyst 46 compared to the case where the heat exchanger 62 is disposed in the vertical direction, and a space 69 is formed between the catalyst 46 and the heat exchanger 62. Yes.

  In such a power train arrangement structure of the vehicle 60, while the vehicle 60 is traveling, the radiator 64, the condenser 66, and the catalyst 46 are radiated by the traveling wind taken from the front grill 28. In addition, when the vehicle 60 travels at a low speed or stops, the fan 68 promotes heat radiation of the radiator 64 and the capacitor 66, and the catalyst 46 radiates heat to the surroundings.

According to this embodiment having such a structure, the same effects as those of the first embodiment described above can be obtained, and the following excellent effects can be obtained.
Since the heat exchanger 62 is disposed to be inclined rearward, the vertical dimension of the heat exchanger 62 can be reduced, and the bonnet height can be reduced. Therefore, the equipment in the engine room 4 can be arranged in a compact manner, and thereby the degree of freedom in designing the vehicle 1 can be increased.

  Further, since the heat exchanger 62 is disposed to be inclined rearward, a space 69 can be formed between the heat exchanger 62 and the catalyst 46. Therefore, it is possible to prevent heat from being trapped between the catalyst 46 and the heat exchanger 62, and the catalyst 46 can radiate heat well to the surrounding space including the space 69. Further, with this arrangement, the traveling wind from the front grille 28 can easily reach the periphery of the catalyst 46 while the vehicle 1 is traveling, so that the heat release of the catalyst 46 can be promoted.

[Third Embodiment]
Next, a vehicle powertrain arrangement structure according to a third embodiment of the present invention will be described with reference to FIGS. The vehicle powertrain arrangement structure according to the third embodiment has substantially the same structure as the vehicle powertrain arrangement structure according to the first embodiment except that the bonnet structure and the heat exchanger structure and arrangement are different. . Further, the heat exchanger of the present embodiment has the same structure and arrangement as the vehicle powertrain arrangement structure according to the second embodiment.
FIG. 6 is a side sectional view showing a front portion of a vehicle 70 according to a third embodiment of the present invention, and FIG. 7 is a plan view showing a front portion of the vehicle 70 according to a third embodiment of the present invention. FIG. 8 is a front view showing a front portion of a vehicle 70 according to the third embodiment of the present invention.

The front end 72A of the bonnet 72 is located below the front edge portion 74A of the upper opening 74 of the engine room 4, and a gap is formed between them. A rear grill portion 76 that communicates the outside of the vehicle 1 and the inside of the engine room 4 is disposed in the gap. The rear grill portion 76 is disposed so as to hang downward from the front edge portion 74A so as to connect the front edge portion 74A of the upper opening 74 and the front end 72A of the bonnet 72, and the upper end of the rear grill portion 76 is It is fixed to the leading edge 74A.
With this arrangement, the rear grill portion 76 is arranged behind the catalyst 46. Accordingly, the rear grill portion 76 covers the rear side surface of the catalyst 46.

  Further, the catalyst 46 is disposed in the middle of the traveling air passage connecting the front grill 28 and the rear grill portion 76. That is, the traveling air passage is an area formed by connecting the formation surface of the front grill 28 and the formation surface of the rear grill portion 76, and the cross-sectional center 46 </ b> A of the catalyst 46 is located in the traveling air passage.

  In such a power train arrangement structure of the vehicle 70, the air taken in from the front grille 28 hits the side surface of the catalyst 46 while the vehicle 70 is traveling, and moves backward while promoting heat dissipation of the catalyst 46, It is discharged from the rear grill portion 76 to the outside.

According to this embodiment having such a structure, the same effects as those of the first embodiment and the second embodiment described above can be obtained, and the following excellent effects can be obtained.
A rear grill portion 76 is formed between the bonnet 72 and the upper opening 74, and the catalyst 46 is located between the front grill 28 and the rear grill portion 76. The wind can be actively guided to the catalyst 46. Thereby, heat dissipation of the catalyst 46 can be promoted.

  Since the rear grill portion 76 is disposed so as to hang downward from the front edge portion 74 </ b> A of the upper opening 74, the rear side surface of the catalyst 46 can be covered. Therefore, when the hood 72 is opened and a hand is inserted into the engine room 4 from the upper opening 74 during maintenance of the vehicle 70 or the like, it is possible to prevent the hand from touching the catalyst 46.

[Fourth Embodiment]
Next, a vehicle powertrain arrangement structure according to a fourth embodiment of the present invention will be described with reference to FIGS. The vehicle powertrain arrangement structure according to the fourth embodiment has substantially the same structure as the vehicle powertrain arrangement structure according to the third embodiment except that a fan is provided in the gap between the bonnet and the upper opening. .
FIG. 9 is a side sectional view showing a front portion of a vehicle 80 according to the fourth embodiment of the present invention, and FIG. 10 is a plan view showing the front portion of the vehicle 80 according to the fourth embodiment of the present invention. 11 is a front view showing a front portion of a vehicle 80 according to the fourth embodiment of the present invention.

  A gap is formed between the front end 72A of the bonnet 72 and the front edge portion 74A of the upper opening 74 of the engine room 4 as in the third embodiment, and a fan 82 is provided in this gap. . A plurality of fans 82 are provided along the vehicle width direction of the vehicle 80. The number and arrangement of the fans 82 may be appropriately set in consideration of the design of the vehicle 80 and the like.

  In such an arrangement structure in the engine room 4 of the vehicle 80, the air taken in from the front grille 28 hits the side surface of the catalyst 46 while the vehicle 80 is traveling, and moves backward while promoting heat dissipation of the catalyst 46. Then, it is discharged to the outside through the gap where the fan 82 is disposed. Further, when the vehicle 80 travels at a low speed or stops, the fan 82 is operated to forcibly take in air from the front grill 28 and promote heat dissipation of the catalyst 46.

According to this embodiment having such a structure, the same effects as those of the first to third embodiments can be obtained, and the following excellent effects can be obtained.
Since the fan 82 is provided between the front end 72A of the bonnet 72 and the front edge 74A of the upper opening 74 of the engine room 4, the air is forced by the fan 82 even when the vehicle 80 travels at a low speed or stops. And the heat release of the catalyst 46 can be promoted.

  The present invention is not limited to the above embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

For example, the exhaust system auxiliary machine is not limited to the front end of the bonnet, that is, the front end of the upper opening portion of the engine room, and may be disposed behind the front end of the bonnet. Moreover, the exhaust system auxiliary machine should just be arrange | positioned above the heat exchanger, and does not necessarily need to be arrange | positioned ahead of the heat exchanger. Therefore, the exhaust system auxiliary machine may be disposed above and behind the heat exchanger. Even in this case, it is possible to arrange the engine room by effectively using a relatively large space. In the case where the heat exchanger is arranged above the heat exchanger, at least one upper end of the heat exchanger is located below the lower end of the exhaust system auxiliary machine, or at least one upper end of the heat exchanger is Including the case where it is located below the upper end of the exhaust system auxiliary machine.
Further, the exhaust system auxiliary machine is not limited to the catalyst, and may be any auxiliary machine provided on the exhaust side of the engine, such as an exhaust pipe.

  The fan 82 in the above-described fourth embodiment is not limited to that disposed in the gap between the front end 72A of the bonnet 72 and the front edge portion 74A of the upper opening 74. For example, the fan is disposed at the position of the front grille. May be. In this case, the fan can accelerate the heat radiation of the equipment in the engine room by sending outside air into the engine room.

When the heat exchanger has a plurality of heat exchanger units, the arrangement, size, shape, etc. of each heat exchanger unit should be arbitrarily set according to the design of the vehicle 1 and the size of each device. Can do.
For example, as in the first embodiment described above, not only the fan 54 is disposed behind the catalyst 46 but, for example, a radiator and a fan may be disposed behind the exhaust system auxiliary machine.
FIG. 12 is a side sectional view showing a front portion of a vehicle 90 according to a modification of the present invention.
The heat exchanger 92 includes a radiator 94, a condenser 96 for air conditioning equipment, and a fan 98 that promotes heat radiation of the radiator 94 and the condenser 96. The vertical dimensions of the radiator 94 and the fan 98 are set to be substantially the same, and are arranged behind the catalyst 46.
The vertical dimension of the capacitor 96 is set smaller than the vertical dimension of the radiator 94 and the fan 98. The capacitor 96 is disposed in front of the radiator 94 and is disposed adjacent to the lower portion of the radiator 94. The catalyst 46 is disposed above the capacitor 96, and the cross-sectional center 46 </ b> A of the catalyst 46 is located above the upper end of the capacitor 96.
Therefore, the catalyst 46 overlaps with the radiator 94 and the fan 98 when viewed in the front-rear direction of the vehicle 90, and overlaps with the capacitor 96 when viewed in the vertical direction of the vehicle 90.

  In such a power train arrangement structure of the vehicle 90, when the fan 98 is operated when the vehicle 90 is traveling at a low speed or stopped, the radiator 94 and the condenser 96 are urged to radiate heat, and the catalyst 46 radiates heat via the radiator 94. Also encourage.

  In such a power train arrangement structure of the vehicle 90, the catalyst 46 is arranged in front of the radiator 94 and the fan 98 and is arranged above the capacitor 96. The catalyst 46 can be arranged in a certain space. Therefore, the arrangement of the devices in the engine room 4 can be made compact.

  Further, since the catalyst 46 is disposed in front of the radiator 94 and the fan 98, the heat of the catalyst 46 can be promoted through the radiator 94 by the operation of the fan 98. Therefore, it is possible to effectively dissipate the equipment in the engine room 4.

The plurality of heat exchanger units only need to be disposed at least partially overlapping in the front-rear direction of the vehicle. In addition, when the exhaust system auxiliary machine is overlapped with the large heat exchanger unit when viewed from the front-rear direction among the plurality of heat exchanger units, at least a part of the exhaust system auxiliary machine is a large heat exchanger unit. As long as it overlaps. Further, when the exhaust system auxiliary machine overlaps with the small heat exchanger unit as viewed from the vertical direction, it is only necessary that at least a part of the exhaust system auxiliary machine overlaps with the small heat exchanger unit.
In the above-described embodiment, the heat exchanger includes a plurality of heat exchanger units including a radiator, a fan, and a condenser. However, the heat exchanger is not limited to this, and the heat exchanger may be any one of the above or You may be comprised with the some heat exchanger unit or another one heat exchanger.
Further, when the heat exchanger is composed of a plurality of heat exchanger units, the exhaust system auxiliary device only needs to be disposed above at least one of the heat exchanger units.
The heat exchanger is not limited to one that is inclined forward or backward. For example, when there is room in the engine room, the heat exchanger may be arranged along the vertical direction.

It is a sectional side view which shows the front part of the vehicle by 1st Embodiment of this invention. 1 is a plan view showing a front portion of a vehicle according to a first embodiment of the present invention. 1 is a front view showing a front portion of a vehicle according to a first embodiment of the present invention. It is a cross section of the tunnel part of the vehicle by 1st Embodiment of this invention. It is a sectional side view which shows the front part of the vehicle by 2nd Embodiment of this invention. It is a sectional side view which shows the front part of the vehicle by 3rd Embodiment of this invention. It is a top view which shows the front part of the vehicle by 3rd Embodiment of this invention. It is a front view which shows the front part of the vehicle by 3rd Embodiment of this invention. It is a sectional side view which shows the front part of the vehicle by 4th Embodiment of this invention. It is a top view which shows the front part of the vehicle by 4th Embodiment of this invention. It is a front view which shows the front part of the vehicle by 4th Embodiment of this invention. It is a sectional side view which shows the front part of the vehicle by the modification of this invention. It is a cross-sectional view of the tunnel part of the conventional vehicle.

Explanation of symbols

1, 60, 70, 80 Vehicle 2 Car compartment 4 Engine room 6 Dash panel 8 Recess 10 Engine 26 Bonnet 28 Front grill 36 Exhaust pipe 46 Catalysts 48, 62, 92 Heat exchangers 50, 64, 94 Radiators 52, 66, 96 condenser 54, 68, 98 fan 76 rear grill 82 fan

Claims (7)

The vehicle compartment and the engine compartment are separated by a dash panel, and a power train arrangement structure for a vehicle in which a power train for driving wheels is arranged in the engine compartment,
The dash panel is formed with a recess recessed toward the passenger compartment, and a power train comprising a vertically mounted engine disposed in the recess and a transmission connected to the rear thereof,
A heat exchanger disposed in front of the engine;
An exhaust system accessory extending from the engine and disposed above the heat exchanger;
A vehicle powertrain arrangement structure characterized by comprising:   2. The vehicle powertrain arrangement structure according to claim 1, wherein the exhaust system auxiliary machine is arranged in front of the heat exchanger.   The vehicle powertrain arrangement structure according to claim 1, wherein the heat exchanger is arranged to be inclined at a predetermined angle toward the front.   The vehicle heattrain installation structure according to claim 1, wherein the heat exchanger is arranged to be inclined at a predetermined angle toward the rear.   The heat exchanger includes a plurality of heat exchanger units having different sizes as viewed from the front-rear direction, arranged so as to overlap at least partially when viewed from the front-rear direction, The large heat exchanger unit of the plurality of heat exchanger units is disposed so as to overlap at least a part when viewed from the front-rear direction, and the small heat exchanger unit of the plurality of heat exchanger units is vertically The vehicle powertrain arrangement structure according to any one of claims 1 to 4, wherein the vehicle powertrain arrangement structure is arranged so that at least a part thereof overlaps when viewed from the direction.   The heat exchanger includes at least a radiator that cools the engine, a condenser that performs heat exchange of the in-vehicle air conditioner, and a fan that cools the radiator and the condenser, and the large heat exchanger unit. The vehicle powertrain arrangement structure according to claim 5, wherein the fan is the fan.   The vehicle powertrain arrangement structure according to any one of claims 1 to 6, wherein the exhaust system auxiliary machine is a catalyst.

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