JP2009029150A - Powertrain arrangement structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve handling stability by arranging a power train on the rear side of a vehicle while preventing an adverse effect caused by an exhaust system auxiliary at a collision of a vehicle. <P>SOLUTION: A vehicle in which a recessed portion 5 recessed at the rear side of the vehicle body is formed at a dash panel 3 for demarcating a cabin 1 and an engine room 2 and a part of a power train 11 for driving wheels is arranged in the recessed portion 5 includes a heat exchanger 18 for power train cooling and an exhaust pipe 22 extending to the forward side of a vehicle body from the engine body 12 forward of the power train 11, exhaust system auxiliary equipment 27 provided at the exhaust pipe 22 forward of the heat exchanger 18 and a behavior regulating portion for regulating a behavior so as to move the exhaust system auxiliary equipment 27 downward according to a load inputted from the forward at a collision of a vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, the dash panel that partitions the vehicle compartment and the engine room is provided with a recessed portion that is recessed into the rear side of the vehicle body, and a part of the power train that drives the wheels is disposed in the recessed portion. The present invention relates to a powertrain arrangement structure for a vehicle.

Conventionally, as shown in Patent Document 1 below, a vehicle compartment and an engine room partitioned by a dash panel are provided in front of the vehicle compartment, and a power train having an engine body and the like disposed in the engine room In a rear-wheel drive vehicle configured to drive wheels, an exhaust pipe of an engine body is disposed so as to extend rearward through the front of the engine, and for exhaust gas purification provided in the exhaust pipe An exhaust system auxiliary machine comprising a catalyzer (catalyst) is arranged to extend in the vehicle width direction on the front side of the power train, and has a radiator and a cooling fan on the front side of the catalyzer. A heat exchanger (cooling unit) is provided.
JP 2003-326981 A

  In the invention disclosed in Patent Document 1, an exhaust system auxiliary machine comprising an exhaust gas purifying catalyzer provided in an exhaust pipe of an engine body is disposed so as to extend in the vehicle width direction on the front side of the power train. Therefore, compared with the case where the exhaust system auxiliary equipment is disposed on the rear side of the power train, the power train can be located on the rear side of the vehicle body, thereby reducing the yaw moment of inertia when the vehicle is running and maneuvering. There is an advantage that stability can be improved. However, when an exhaust system auxiliary machine is disposed between a heat exchanger such as a radiator and a power train as described above, an exhaust pipe is introduced in a limited space to install the exhaust system auxiliary machine. Because it is necessary to install, the freedom of layout is limited, it is difficult to install a large exhaust system auxiliary equipment, and the exhaust system auxiliary equipment has the effect of heat on the powertrain and heat exchanger. There are problems such as being easily received.

  It is also conceivable to arrange an exhaust system auxiliary machine on the front side of the heat exchanger. In this case, since a large exhaust system auxiliary machine can be laid out freely using a wide space provided in the front part in the engine room, conventionally, in the tunnel part of the passenger compartment floor or below the floor panel. The downstream side catalyzer arranged in the same manner can be omitted or miniaturized, and the thermal effect can be prevented from reaching the vehicle interior. On the other hand, there is a problem that the exhaust system auxiliary equipment disposed in the front part of the engine room may have an adverse effect at the time of a vehicle collision, and countermeasures are required.

  The present invention has been made in view of the above-described problems. The power train is disposed on the rear side of the vehicle while preventing the auxiliary exhaust system from adversely affecting the vehicle in the event of a vehicle collision. It is an object of the present invention to provide a vehicle powertrain arrangement structure that can improve performance.

  In the invention according to claim 1, the dash panel that partitions the vehicle compartment and the engine room is provided with a recessed portion that is recessed on the rear side of the vehicle body, and the power train that drives the wheels is provided in the recessed portion. In the vehicle in which the section is disposed, a heat exchanger for cooling the power train and an exhaust pipe extending from the power train to the front side of the vehicle body are disposed in front of the power train, and provided in the exhaust pipe. An exhaust system auxiliary device is disposed in front of the heat exchanger, and a behavior restriction that restricts the behavior of the exhaust system auxiliary device so that the exhaust system auxiliary device is moved downward according to a load input from the front in the event of a vehicle collision. It has a part.

  According to a second aspect of the present invention, in the vehicle powertrain arrangement structure according to the first aspect, the behavior restricting portion is provided in a cross member arranged in front of the heat exchanger.

  According to a third aspect of the present invention, in the vehicle powertrain arrangement structure according to the second aspect, the behavior restricting portion is constituted by a rear-falling guide surface provided on the cross member.

  According to a fourth aspect of the present invention, in the vehicle powertrain disposition structure according to the first aspect, the behavior restricting portion is provided in a heat shield member disposed between the heat exchanger and the exhaust system auxiliary device. It is provided.

  According to a fifth aspect of the present invention, in the vehicle powertrain arrangement structure according to the fourth aspect, the behavior restricting portion is configured by a rearwardly inclined portion provided on the heat shield member.

  According to a sixth aspect of the present invention, in the vehicle powertrain arrangement structure according to the first aspect, the behavior restricting portion is constituted by a heat exchanger disposed behind an exhaust system auxiliary machine. is there.

  According to a seventh aspect of the present invention, in the vehicle powertrain arrangement structure according to the fourth aspect, the heat exchanger is installed in a forward inclined posture, and the exhaust system auxiliary device is moved downward by a front wall surface thereof. A guide surface is constructed.

  According to an eighth aspect of the present invention, there is provided the vehicle powertrain arrangement structure according to any one of the first to seventh aspects, wherein the powertrain is arranged vertically in an engine room. And a transmission connected to the rear thereof.

  According to a ninth aspect of the present invention, in the vehicle powertrain arrangement structure according to any one of the first to eighth aspects, the exhaust system accessory comprises a catalyst for purifying exhaust gas.

  In the first aspect of the invention, the exhaust system auxiliary equipment including the exhaust gas purifying catalyzer and the like is disposed on the front side of the power train, and a part of the power train is disposed in the recessed portion of the dash panel. Therefore, since the power train, which is a heavy object disposed in the engine room, can be positioned as far as possible on the rear side of the vehicle, the center of gravity of the vehicle is positioned on the center side of the vehicle body. In addition, it is possible to effectively reduce the yaw moment of inertia acting when the vehicle travels, and to improve the steering stability. In addition, since the behavior restricting portion is provided for restricting the behavior of the exhaust system auxiliary device so that the exhaust system auxiliary device is moved downward according to the load input from the front in the event of a vehicle collision, the exhaust system auxiliary device is installed in the front of the engine room. Even in the case where the vehicle is disposed in a part, the rearward movement of the power train is suppressed without impairing the impact absorbing function in the event of a front-end collision in which the front end of the vehicle collides with an obstacle or another vehicle. There is an advantage that it can be effectively prevented from reaching the rear side of the engine room.

  In the invention according to claim 2, the cross member disposed in front of the heat exchanger is provided with the behavior restricting portion that restricts the behavior of the exhaust system auxiliary machine, so that it is provided to maintain the strength of the vehicle body. By using this member (cross member), the behavior of the exhaust system auxiliary machine can be regulated at the time of a vehicle collision, and there is an advantage that the rearward movement of the power train can be suppressed without increasing the vehicle body weight.

  In the invention according to claim 3, since the cross member is provided with a rear-falling guide surface, and the behavior of the exhaust system auxiliary machine is regulated by the guide surface, the exhaust system auxiliary machine can be smoothly installed in the event of a vehicle collision. There is an advantage that the rearward movement of the power train can be effectively suppressed by moving downward.

  In the invention according to claim 4, when the exhaust system auxiliary machine is pushed backward at the time of a vehicle collision, the behavior is regulated by the heat shield member, so that the impact load input to the exhaust system auxiliary machine is There is an advantage that transmission to the power train through the exhaust pipe can be effectively prevented.

  In the invention according to claim 5, when the exhaust system auxiliary machine is pushed backward at the time of a vehicle collision, the back surface thereof is brought into contact with the inclined portion of the heat shield member, and obliquely downward along the inclined portion. The impact load input to the exhaust system auxiliary equipment is transmitted to the power train through the exhaust pipe and acts in the direction of pushing the power train to the rear side of the vehicle body. There is an advantage that it can be effectively prevented.

  In the invention according to claim 6, since the exhaust system auxiliary machine is guided downward by the heat exchanger at the time of the collision of the vehicle, the behavior of the exhaust system auxiliary machine is regulated. There is an advantage that can be prevented.

  In the invention according to claim 7, since the exhaust system auxiliary machine is guided downward along the front wall surface of the heat exchanger at the time of a vehicle collision, the behavior of the exhaust system auxiliary machine is regulated. There is an advantage that the rearward movement of the power train can be prevented with a simple configuration without increasing the weight.

  In the invention according to claim 8, since the power train having the engine main body and the transmission, which are heavy objects arranged vertically in the engine room, can be arranged on the rear side of the vehicle as much as possible, By positioning the center of gravity of the vehicle on the center side of the vehicle body, it is possible to effectively reduce the yaw moment of inertia that acts when the vehicle is traveling and to improve the steering stability.

  In the invention according to claim 9, the active state changes notably according to the temperature change, and is easily deteriorated when heated to a high temperature, and tends to generate heat in the active state. Because the exhaust system auxiliary equipment consisting of the catalyzer is arranged on the front side of the heat exchanger for powertrain cooling, the catalyzer can be prevented from prematurely deteriorating due to the heat effect of the powertrain, etc. There is an advantage that it is possible to effectively prevent the occurrence of a situation in which the exhaust gas purification performance is lowered due to being heated to a temperature higher than the appropriate reaction temperature.

  1 to 3 show a first embodiment of a vehicle powertrain arrangement structure according to the present invention. The vehicle is provided with a dash panel 3 that partitions the compartment 1 and the engine room 2, and a front end portion of the floor panel 4 is connected to a lower end portion of the dash panel 3. The dash panel 3 is formed with a recessed portion 5 that is recessed in the rear side of the vehicle body in the vehicle width direction central portion, and the floor panel 4 has a tunnel that bulges upward in the vehicle width direction central portion. Part 6 is formed.

  A bonnet 7 is installed on the upper surface of the engine room 2 so as to be openable and closable. Below the front end of the bonnet 7 is disposed a front grill 9 having an opening for taking in traveling wind, and a bumper reinforcement 10 is installed behind the bonnet 7 so as to extend in the vehicle width direction. ing. A power train 11 for driving rear wheels (not shown) is disposed at the rear of the engine room 2. The power train 11 has an engine main body 12 composed of a rotary engine or the like arranged in a vertical manner, and a transmission 13 connected to the rear thereof. The rear portion of the engine body 12 is disposed in a recessed portion 5 formed in the dash panel 3, and the transmission 13, the propeller shaft 14 connected thereto, and the power plant frame 15 are connected to the tunnel. It is disposed in the part 6.

  In front of the engine body 12, a heat exchanger 18 for powertrain cooling including a heat exchanger body 16 made of a radiator and the like, and a cooling fan 17 and the like located on the rear side of the heat exchanger body 16 is provided on the engine body 12. It is installed in a forward tilt posture of a predetermined angle at a position close to the front surface. A suspension cross member 19 is installed below the heat exchanger 18 so as to extend in the vehicle width direction, and a lower end portion of the heat exchanger 18 is supported by the suspension cross member 19. The upper end portion of the heat exchanger 18 is supported by a front side frame 20 disposed so as to extend from the installation portion of the bumper reinforcement 10 to the rear side of the vehicle body via a bracket (not shown). ing.

  An exhaust pipe 22 communicating with the exhaust port is connected to one side surface of the engine main body 12 constituting the power train 11. The exhaust pipe 22 includes a front extension 23 that extends from one side surface of the engine body 12 toward the front side of the vehicle body, and a first lateral extension that extends in the vehicle width direction from the front end of the exhaust pipe 22 at the lower rear of the bumper reinforcement 10. Portion 24, a second side extension 25 extending in the vehicle width direction toward the other end of heat exchanger 18 by being bent in a U shape at the side end thereof, and the vehicle body from the side end The rear extension 26 extends to the rear side of the tunnel, and the rear extension 26 is introduced into the tunnel portion 6. In addition, an exhaust system auxiliary machine 27 made of an exhaust gas purification catalyzer or the like is disposed in the first side extension 24 of the exhaust pipe 22 so as to extend in the vehicle width direction on the front side of the heat exchanger 18. It is installed.

  A cross member 28 is installed on the front side of the heat exchanger 18 and on the rear side of the exhaust system auxiliary machine 27 so as to extend in the vehicle width direction, and both left and right ends thereof are fixed to the lower surface of the front side frame 20. Has been. As shown in FIG. 4, a rear-lowering guide surface 29 is formed at a position facing the rear surface of the exhaust system auxiliary machine 27 at the center of the cross member 28 in the vehicle width direction. A behavior regulating unit is configured to regulate the behavior of the exhaust system auxiliary machine 27 so as to move downward in accordance with a load input from the front in the event of a collision.

  That is, in the event of a frontal collision where the front end of the vehicle collides with an obstacle or another vehicle, the front side frame as shown in FIG. 5 according to the impact load input to the bumper reinforcement 10. The impact load is absorbed while the front portion of 20 is compressed and deformed. Further, when the exhaust system auxiliary device 27 is pressed rearward according to the impact load at the time of the front collision, the rear surface thereof abuts on the guide surface 29 of the cross member 28, and obliquely downward along the guide surface 29. The behavior of the exhaust system auxiliary device 27 is regulated so as to move, and a load that moves the front end portion (first lateral extension portion 24) of the exhaust pipe 22 obliquely downward in response to this is acted. To do. In response to this load, a bending moment for deforming the front extension 23 acts on the rear end of the exhaust pipe 22 fixed to one side of the engine body 12 as a fulcrum, and the front extension 23 is bent and deformed. Since the front end portion is lowered, a large stress is generated in the direction in which the impact load input to the exhaust system auxiliary machine 27 pushes the power train 11 to the rear side of the vehicle body via the front extension 23 of the exhaust pipe 22. This prevents the rearward movement of the power train 11.

  As described above, the dash panel 3 that partitions the vehicle compartment 1 and the engine room 2 is provided with the recessed portion 5 that is recessed into the rear side of the vehicle body, and a part of the power train 11 that drives the wheel is the recessed portion 5. In the vehicle disposed inside, a heat exchanger 18 for cooling the power train and an exhaust pipe 22 extending from the engine body 12 constituting the power train 11 to the front side of the vehicle body are arranged in front of the power train 11. In addition, when the exhaust system auxiliary machine 27 provided in the exhaust pipe 22 is disposed in front of the heat exchanger 18, the exhaust system auxiliary machine 27 is affected by the heat of the engine body 12. There is an advantage that the power train 11 is positioned on the rear side of the vehicle while being suppressed, and the moment of inertia of the yaw when the vehicle is running can be effectively reduced.

  That is, an exhaust system auxiliary device 27 including the exhaust gas purifying catalyzer is disposed on the front side of the power train 11, and a part of the power train 11 is disposed in the recessed portion 5 of the dash panel 3. As a result, the power train 11 including the engine main body 12 and the transmission 13 which are heavy objects disposed vertically in the engine room 2 can be disposed on the rear side of the vehicle as much as possible. Therefore, by positioning the center of gravity of the vehicle on the center portion side of the vehicle body, it is possible to effectively reduce the yaw moment of inertia acting when the vehicle is traveling, and to improve the steering stability and traveling stability of the vehicle.

  In addition, since the exhaust train auxiliary machine 27 composed of a large catalyzer can be freely laid out in the engine room 2 where a space is provided by positioning the power train 11 on the rear side of the vehicle, The downstream side catalyzer disposed in the tunnel portion 6 of the passenger compartment floor or below the floor panel 4 can be downsized or omitted. Therefore, without taking measures such as installing a heat insulating member in order to prevent the influence of heat generated in the downstream catalyzer from reaching the passenger compartment, the foot portion of the occupant is adjusted according to the reaction heat of the catalyzer. There is an advantage that heating and the like can be effectively prevented. Moreover, unlike the case where the exhaust gas purifying catalyzer is disposed below the passenger seat disposed in the passenger compartment 1, it is not necessary to position the passenger seat upward, so that the vehicle height is reduced. Is possible.

  Further, an exhaust system auxiliary device 27 including an exhaust gas purifying catalyzer is disposed on the front side of the heat exchanger 18 for power train cooling including the heat exchanger main body 16 including the radiator and the cooling fan 17. Thus, the heat exchanger 18 can prevent the heat effect of the power train 11 that is in a high temperature state during traveling of the vehicle from reaching the installation part of the exhaust system auxiliary device 27. Therefore, when the vehicle travels, the exhaust system auxiliary machine 27 is quickly deteriorated due to the heat effect of the power train 11, or is heated to a temperature higher than the appropriate reaction temperature, and the exhaust gas purification performance is lowered. Can be effectively prevented. Moreover, by arranging the heat exchanger 18, which is a heavy object disposed in the vicinity of the front end portion of the vehicle body in the prior art, to be retracted to the front position of the power train 11, the yaw inertia moment acting when the vehicle is traveling can be reduced. Since it can be effectively reduced, there is an advantage that a further significant improvement in steering stability can be obtained.

  Then, as described above, the behavior regulation including the guide surface 29 of the cross member 28 that regulates the behavior so that the exhaust system auxiliary machine 27 is moved downward according to the load input from the front in the event of a vehicle collision. Even when the exhaust system auxiliary machine 27 is disposed in the front part in the engine room 2, the front end of the vehicle collides with an obstacle or another vehicle, and the like, There is an advantage that it is possible to effectively prevent the influence of the front collision accident from reaching the rear side of the engine room 2 without impairing the shock absorbing action by deforming the front part of the front side frame 20.

  That is, the exhaust system auxiliary machine 27 is pushed backward after the shock absorbing action due to the deformation of the front part of the front side frame 20 is exerted according to the impact load input at the time of occurrence of the front collision accident. Since the back surface thereof abuts against the guide surface 29 of the cross member 28, the behavior of the exhaust system auxiliary device 27 is regulated so as to move obliquely downward along the guide surface 29. The impact load input to the machine 27 is effectively prevented from being transmitted to the power train 11 via the front extension 23 of the exhaust pipe 22 and acting in the direction of pushing it toward the rear side of the vehicle body. be able to. Accordingly, when the front collision occurs, the power train 11 moves backward to deform the dash panel 3, or the exhaust system auxiliary device 27 comes into contact with the heat exchanger 18 and damages the heat exchanger 18. It is possible to effectively prevent the occurrence of such a situation, and to reduce the repair cost at the time of occurrence of the front collision accident at a low cost.

  In particular, as shown in the first embodiment, the cross member 28 disposed in front of the heat exchanger 18 for cooling the power train is provided with a guide surface 29 that is lowered rearward. In the case where the behavior of the exhaust system auxiliary equipment 27 including a catalyzer for the vehicle is regulated, the existing member (cross member 28) provided for maintaining the strength of the vehicle body is used to Since the exhaust system auxiliary machine 27 can be smoothly moved obliquely downward in the event of a collision, there is an advantage that the rearward movement of the power train 11 can be effectively prevented without increasing the weight of the vehicle body.

  Instead of the above-described embodiment in which the behavior restricting portion is configured by the back-lowering guide surface 29 provided on the cross member 28, a separate member having a guide plate inclined downwardly on the lower surface of the cross member 28 is provided. A behavior restricting section that attaches a bracket and restricts the behavior of the exhaust system auxiliary machine 27 so as to move downward when the vehicle collides may be configured by the guide plate. When configured in this manner, there is an advantage that the size and inclination angle of the guide plate can be easily and arbitrarily set.

  6 and 7 show that a heat shield member 30 is provided between the exhaust system auxiliary device 27 disposed on the front side of the engine body 12 and the heat exchanger 18, and an installation portion of the bumper reinforcement 10 is shown. 3 shows a second embodiment of the present invention in which a guide plate 31 is provided so as to extend to the rear side of the vehicle body along the lower surface of the hood 7 from the front. The heat shield member 30 includes a horizontal portion 32 that covers the upper surface portion of the exhaust system auxiliary machine 27, and an inclined portion 33 that extends obliquely downward from the rear end portion thereof, and is a plate material having a predetermined rigidity and heat insulating property. The exhaust system auxiliary device 27 is configured to cover the upper surface portion and the rear surface portion. Then, when the vehicle collides, the inclined portion 33 of the heat shield member 30 functions as a behavior restricting portion that moves the exhaust system auxiliary device 27 downward, so that the exhaust system auxiliary device is virtually shown in FIG. 27 is guided downward along the inclined portion 33.

  According to the above configuration, when the exhaust system auxiliary machine 27 is pushed backward at the time of the occurrence of the front collision, the back surface thereof is brought into contact with the inclined portion 33 of the heat shield member 30, and the inclined portion 33 is brought into contact with the inclined portion 33. By restricting the behavior of the exhaust system auxiliary machine 27 so that the exhaust system auxiliary machine 27 can be smoothly moved obliquely downward, the impact load input to the exhaust system auxiliary machine 27 is applied to the front extension 23 of the exhaust pipe 22. There is an advantage that it can be effectively prevented from being transmitted to the power train 11 via the, and acting in the direction of pushing it toward the rear side of the vehicle body.

  Moreover, when the vehicle travels, the heat generated by the heat exchange of the engine cooling water in the heat exchanger 18 reaches the exhaust system auxiliary equipment 27 including the exhaust gas purifying catalyzer. The heat shield member 30 can effectively prevent the traveling wind introduced into the engine room 2 from the lower portion of the front grille 9 to the installation part of the exhaust system auxiliary machine 27 by the heat shield member 30. Since the exhaust system auxiliary 27 is affected by the heat of the heat exchanger 18 at an early stage or is heated to a temperature higher than the appropriate reaction temperature, the exhaust gas purification performance is lowered. There is an advantage that it can be effectively prevented.

  FIG. 8 shows a third embodiment of the vehicle powertrain arrangement structure according to the present invention. In the third embodiment, a heat exchanger 18 including a heat exchanger main body 16 and a cooling fan 17 is installed in a forward inclined posture behind the exhaust system auxiliary machine 27, and its front wall surface, specifically, the above-mentioned The front wall surface of the heat exchanger 18 constitutes a guide surface that moves the exhaust system auxiliary device 27 downward in the event of a vehicle collision. According to the fourth embodiment, when the vehicle collides, the exhaust system auxiliary 27 is smoothly guided downward along the front wall surface of the heat exchanger 18 as shown in phantom in FIG. There is an advantage that the behavior of the system auxiliary machine 27 can be regulated and the rearward movement of the power train 11 can be prevented without increasing the weight of the vehicle body.

  Instead of the third embodiment in which the guide surface for moving the exhaust system auxiliary machine 27 downward is formed by the front wall surface of the heat exchanger main body 16, the behavior of the exhaust system auxiliary machine 27 is restricted in the event of a vehicle collision. The guide member may be provided in the heat exchanger 18. In this case, since a separate guide member is required, it is inevitable that the weight of the vehicle body increases accordingly. However, the exhaust system auxiliary device 27 comes into contact with the heat exchanger 18 when the vehicle collides, There is an advantage that the heat exchanger 18 can be effectively prevented from being damaged.

  Moreover, in each said embodiment, a part of powertrain 11 provided with the engine main body 12 arrange | positioned vertically in the engine room 2 and the transmission 13 connected to the back is attached to the dash panel 3. Since the engine body 12 and the transmission 13, which are heavy objects, are disposed as far as possible on the rear side of the vehicle, the center of gravity of the vehicle is set at the center of the vehicle body. By positioning it on the side, it is possible to effectively reduce the yaw moment of inertia acting when the vehicle is running and to improve the steering stability.

  In addition to the exhaust gas purification catalyzer, the exhaust system auxiliary machine 27 may be a turbocharger exhaust turbine or the like. However, the above-described catalyzer for purifying exhaust gas has an active state remarkably changed according to a temperature change, and is likely to be thermally deteriorated when heated to a high temperature, and tends to generate heat in the active state. Therefore, as shown in the above-described embodiment, the exhaust system auxiliary machine 27 is provided by disposing an exhaust system auxiliary machine 27 composed of an exhaust gas purifying catalyst on the front side of the heat exchanger 18 for cooling the power train. Can be prevented from being rapidly deteriorated due to the thermal influence of the engine body 12 and can be effectively prevented from being heated to a temperature higher than the appropriate reaction temperature and degrading the exhaust gas purification performance. desirable.

1 is a side sectional view showing a first embodiment of a vehicle powertrain arrangement structure according to the present invention. It is a top sectional view showing a 1st embodiment of the above-mentioned powertrain arrangement structure. It is a front view which shows 1st Embodiment of the said powertrain arrangement | positioning structure. It is a perspective view which shows the specific structure of a cross member. It is explanatory drawing which shows the state which the front collision accident of the vehicle generate | occur | produced. It is side surface sectional drawing which shows 2nd Embodiment of the powertrain arrangement | positioning structure of the vehicle which concerns on this invention. It is a plane sectional view showing a 2nd embodiment of the above-mentioned powertrain arrangement structure. It is side surface sectional drawing which shows 3rd Embodiment of the powertrain arrangement | positioning structure of the vehicle which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car compartment 2 Engine room 11 Power train 12 Engine main body 13 Transmission 18 Heat exchanger 20 Exhaust pipe 27 Exhaust system auxiliary machine 28 Cross member 29 Guide surface 30 Heat shield member 33 Inclined part

Claims (9)

  In a vehicle in which a dash panel that partitions the vehicle compartment and the engine room is provided with a recessed portion that is recessed into the rear side of the vehicle body, and a part of the power train that drives the wheels is disposed in the recessed portion. A heat exchanger for cooling the power train and an exhaust pipe extending from the power train to the front side of the vehicle body are disposed in front of the power train, and an exhaust system auxiliary device provided in the exhaust pipe serves as the heat exchanger. And a behavior restricting portion for restricting the behavior of the exhaust system auxiliary device so that the exhaust system auxiliary device is moved downward according to a load input from the front in the event of a vehicle collision. A vehicle powertrain arrangement structure.   2. The vehicle powertrain arrangement structure according to claim 1, wherein the behavior restricting portion is provided in a cross member arranged in front of the heat exchanger.   The vehicle powertrain arrangement structure according to claim 2, wherein the behavior restricting portion is configured by a rear-falling guide surface provided on the cross member.   2. The vehicle powertrain arrangement structure according to claim 1, wherein the behavior restricting portion is provided in a heat shield member provided between the heat exchanger and the exhaust system auxiliary machine.   The vehicle powertrain arrangement structure according to claim 4, wherein the behavior restricting portion is configured by an inclined portion that is provided on the heat shield member and descends downward.   2. The vehicle powertrain arrangement structure according to claim 1, wherein the behavior restricting section is constituted by a heat exchanger arranged behind an exhaust system auxiliary machine.   7. The vehicle powertrain arrangement structure according to claim 6, wherein the heat exchanger is installed in a forward leaning posture, and a guide surface for moving the exhaust system auxiliary device downward is constituted by a front wall surface of the heat exchanger. .   The said power train was provided with the engine main body arrange | positioned vertically in an engine room, and the transmission connected to the back, The one of Claims 1-7 characterized by the above-mentioned. Vehicle powertrain arrangement structure.   The vehicle powertrain arrangement structure according to any one of claims 1 to 8, wherein the exhaust system auxiliary device is a catalyzer for purifying exhaust gas.

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