JP2009018710A - Powertrain arrangement structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve steering stability by arranging a powertrain at the rear side of a vehicle while preventing an exhaust system auxiliary from receiving the thermal effect of an engine body or the like. <P>SOLUTION: In the vehicle, a recess 5 recessed to the rear side of the vehicle is provided at a dash panel 3 for partitioning a vehicle interior and an engine room 2, and part of the powertrain 11 for driving wheels is disposed in the recess 5. The powertrain 11 is equipped with the engine body 12 vertically disposed in the engine room 2 and a transmission 13 connected at the rear side. A heat exchanger 18 for cooling the engine and an exhaust pipe extending from the engine body 12 to the front side of a vehicle body are disposed at the front of the engine body 12, and the exhaust system auxiliary 27 provided on the exhaust pipe is disposed at the front of the heat exchanger 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

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 the rear is driven by a power train having an engine body and the like disposed in the engine room. In a rear-wheel drive vehicle configured such that wheels are driven, 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. The heat exchanger (cooling unit) for cooling the engine has a catalyzer (catalyst) that extends 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. It is carried out.
JP 2003-326981 A

  As disclosed in Patent Document 1, an exhaust gas purifying catalyzer (catalyst) 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. In this case, the power train can be positioned on the rear side of the vehicle body as compared with the case where the catalyzer is disposed on the rear side of the power train. It is possible to improve. However, as described above, an exhaust system auxiliary device comprising an exhaust gas purifying catalyzer is disposed in the vicinity of the front portion of the power train, and has a radiator and a cooling fan on the front side thereof. When the engine is disposed, the exhaust system auxiliary machine can be heated and activated immediately after the engine is started, but the exhaust system auxiliary machine is affected by the heat of the engine body when the vehicle is running. There is a problem that the exhaust system auxiliary is easily heated excessively, and the exhaust system auxiliary equipment is quickly deteriorated by heat or it is difficult to maintain an appropriate reaction temperature.

  The present invention has been made in view of the above-mentioned problems. The power train is disposed on the rear side of the vehicle while preventing the exhaust system auxiliary equipment from being affected by the heat of the engine body. 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, 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 provided in the recessed portion. The power train includes an engine body vertically disposed in an engine room and a transmission connected to the rear of the engine body, and the engine is disposed in front of the engine body for cooling the engine. And an exhaust pipe extending from the engine body to the front side of the vehicle body, and an exhaust system auxiliary device provided in the exhaust pipe is provided in front of the heat exchanger. is there.

  According to a second aspect of the present invention, in the vehicle powertrain arrangement structure according to the first aspect of the present invention, the vehicle includes a cooling means for guiding the traveling wind of the vehicle to the exhaust system auxiliary device to cool the exhaust system auxiliary device. It is a thing.

  According to a third aspect of the present invention, in the vehicle powertrain arrangement structure according to the first or second aspect, a heat shield means is provided between the exhaust system auxiliary machine and the heat exchanger.

  According to a fourth aspect of the present invention, in the vehicle powertrain arrangement structure according to any one of the first to third aspects of the present invention, the heat exchanger includes a heat exchanger main body, and a cooling air is supplied to the heat exchanger main body. And an upper end or lower end of the cooling fan is disposed offset at least above or below the heat exchanger body, and the exhaust system auxiliary is disposed in front of the offset portion. A machine is provided.

  According to a fifth aspect of the present invention, in the vehicle powertrain arrangement structure according to the fourth aspect, a cooling air guide duct is provided so as to connect the installation portion of the exhaust system auxiliary device and the offset portion of the cooling fan. It is provided.

  According to a sixth aspect of the invention, in the vehicle powertrain arrangement structure according to any one of the first to fifth aspects, a cooler for engine oil is arranged in front of the exhaust system auxiliary machine. Is.

  The invention according to claim 7 is the vehicle powertrain arrangement structure according to any one of claims 1 to 6, wherein the exhaust system auxiliary device is heated in the vicinity of the exhaust system auxiliary device. A thermal heater is provided.

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

  In the invention according to claim 1, the exhaust system auxiliary equipment including the exhaust gas purifying catalyzer is disposed on the front side of the engine body, and a part of the power train is disposed in the dash panel recess. Thus, since the engine body and the transmission, which are heavy objects arranged vertically 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 set at the center of the vehicle. By positioning on the side, it is possible to effectively reduce the yaw moment of inertia acting when the vehicle travels and to improve travel stability. In addition, since the exhaust system auxiliary equipment is disposed in front of the heat exchanger in the engine room where a space is provided by positioning the power train on the rear side of the vehicle, the heat influence of the exhaust system auxiliary equipment is provided. Can be effectively prevented from reaching the passenger compartment, and the heat exchanger can prevent the heat influence of the engine body, which is in a high temperature state when the vehicle is running, from reaching the exhaust system auxiliary device.

  In the invention according to claim 2, since the exhaust system auxiliary machine can be efficiently cooled by guiding the traveling wind of the vehicle to the installation part of the exhaust system auxiliary machine, heat damage is caused to the exhaust system auxiliary machine. There is an advantage that it can be effectively prevented.

  In the invention according to claim 3, it is effective by the heat shield means that the influence of the heat generated by the heat exchange of the engine cooling water in the heat exchanger during the traveling of the vehicle reaches the exhaust system auxiliary machine. There is an advantage that can be prevented.

  In the invention according to claim 4, when the vehicle travels, traveling wind that is introduced into the engine room and increased in speed according to the suction force of the cooling fan is supplied to the installation part of the exhaust system auxiliary machine. On the other hand, since it can be supplied positively, the exhaust system auxiliary equipment can be efficiently cooled to prevent its thermal deterioration and the like more effectively.

  In the invention according to claim 5, since the air duct is provided so as to connect the installation portion of the exhaust system auxiliary device and the offset portion of the cooling fan, the suction force generated when the cooling fan is operated is reduced. By effectively acting on the installation part, the traveling wind introduced into the engine room is actively supplied to the installation part of the exhaust system auxiliary equipment when the vehicle is traveling, and this exhaust system auxiliary equipment is more effective. Can be cooled.

  In the invention according to claim 6, since the heat exchanger can prevent the heat influence of the engine main body, which is in a high temperature state, from reaching the engine oil cooler when the vehicle is running, the cooler can be prevented early. There is an advantage that it is possible to effectively prevent thermal deterioration or deterioration of engine oil cooling performance.

  The invention according to claim 7 has an advantage that the exhaust system auxiliary machine can be heated and activated early by the thermal heater immediately after the engine is started.

  In the invention according to claim 8, for the exhaust gas purification, the active state changes significantly according to the temperature change, tends to cause thermal deterioration when heated to a high temperature, and tends to generate heat in the active state. Since the catalyzer is disposed on the front side of the heat exchanger for cooling the engine, it is possible to prevent the exhaust system auxiliary equipment consisting of the exhaust gas purifying catalyzer from prematurely deteriorating due to the heat effect of the engine body, There is an advantage that it is possible to effectively prevent the exhaust gas purification performance from being lowered by 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, an engine cooling heat exchanger 18 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 front surface of the engine body 12. It is installed in a forward tilt posture of a predetermined angle at a position close to. 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. Further, the upper end portion of the heat exchanger 18 is installed so as to cover the lower surface portion of the front side frame 20 or the bonnet 7 arranged so as to extend from the installation portion of the bumper reinforcement 10 to the rear side of the vehicle body. It is supported by the shielding plate 21 or the like.

  An exhaust pipe 22 communicating with the exhaust port is connected to one side surface of the engine body 12. The exhaust pipe 22 includes a front extension 23 that extends from one side surface of the engine body 12 to the front side of the vehicle body, and a first side that extends in the vehicle width direction from the front end of the exhaust pipe 22 through the front lower portion of the heat exchanger 18. A side extension 24, a second side extension 25 extending in the vehicle width direction toward the other end of the heat exchanger 18 by being bent in a U shape at the side end thereof, and a side end thereof And a rear extension 26 extending to the rear side of the vehicle body. 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.

  An under cover 28 is installed between the lower portion of the front bumper and the lower end portion of the suspension cross member 19 to cover the lower surface of the engine room 2 to prevent turbulence of the air flowing under the floor. The under cover 28 guides the running air introduced into the engine room 2 from the lower part of the front grill 9 to the installation part of the exhaust system auxiliary machine 27 so that the exhaust system auxiliary machine 27 is driven by the vehicle. It also has a function as a cooling means for cooling sometimes. In addition, an opening 29 is formed in the rear part of the under cover 28 to guide the traveling wind guided by the installation part of the exhaust system auxiliary machine 27 downward.

  In the above configuration, immediately after the engine is started, engine cooling water is supplied to the heat exchanger main body 16 including a radiator and the like, and the cooling fan 17 is activated to supply cooling air to the heat exchanger main body 16. Thus, heat exchange of the engine cooling water is performed. A part of the heat generated by the heat exchange in the heat exchanger body 16 is supplied to the exhaust system auxiliary machine 27 composed of the exhaust gas purifying catalyzer, etc., and the exhaust system auxiliary machine 27 is heated and its activity is increased. Is promoted.

  When the vehicle is traveling, traveling wind introduced into the engine room 2 from the opening of the front grill 9 is guided to the installation side of the heat exchanger 18 by the shielding plate 21 and the cooling fan 17. When the traveling wind is supplied to the installation portion of the heat exchanger 18 according to the suction force, the heat exchange of the engine cooling water is positively performed. Further, the traveling wind introduced into the engine room 2 from the lower part of the front grill 9 is guided to the installation part of the exhaust system auxiliary machine 27 by the under cover 28 as shown by an arrow α in FIG. The system auxiliary machine 27 is cooled so that the temperature does not rise excessively.

  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 engine and an exhaust pipe 22 extending from the engine body 12 to the front side of the vehicle body are disposed in front of the engine body 12 constituting 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 suppressed from being affected by the heat of the engine body 12. However, there is an advantage that the yaw inertia moment can be effectively reduced when the power train 11 is positioned on the rear side of the vehicle and the vehicle is traveling.

  That is, an exhaust system auxiliary device 27 including the exhaust gas purifying catalyzer is disposed on the front side of the engine body 12 and the rear portion of the engine body 12 constituting the power train 11 is disposed in the recessed portion 5. By installing, the engine body 12 and the transmission 13 which are heavy objects arranged vertically in the engine room 2 can be arranged as far as possible on the rear side of the vehicle. By positioning the center of gravity on the center side of the vehicle, it is possible to effectively reduce the yaw moment of inertia that acts when the vehicle is traveling and to improve the traveling stability.

  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.

  As described above, an exhaust system auxiliary device 27 including an exhaust gas purifying catalyzer is provided on the front side of the heat exchanger 18 for cooling the engine including the heat exchanger main body 16 including the radiator and the cooling fan 17. Therefore, the heat exchanger 18 can prevent the heat influence of the engine body 12 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 engine body 12, or is heated to a temperature higher than the appropriate reaction temperature and the exhaust gas purification performance is lowered. Can be effectively prevented. Furthermore, by arranging the heat exchanger 18, which is a heavy object disposed near the front end portion of the vehicle body in the prior art, to be retracted to the front position of the engine body 12, the yaw moment of inertia acting when the vehicle travels can be reduced. Further, since it can be further reduced, there is an advantage that a further significant improvement in running stability can be obtained.

  Further, as shown in the first embodiment, a cooling means including an under cover 28 that covers the lower surface of the engine room 2 is installed between the lower end of the front grill 9 and the lower end of the suspension cross member 19. As a result, the traveling wind introduced into the engine room 2 from the lower part of the front grill 9 is guided to the installation part of the exhaust system auxiliary machine 27 as shown by the arrow α in FIG. Since the exhaust system auxiliary device 27 is efficiently cooled by the traveling wind when the vehicle is traveling, there is an advantage that heat damage can be effectively prevented from occurring in the exhaust system auxiliary device 27.

  In particular, in the first embodiment, since the shielding plate 21 serving as the attachment portion of the heat exchanger 18 is installed so as to cover the lower surface portion of the bonnet 7, the opening of the front grill 9 is used to move the engine compartment 2 into the engine room 2 when the vehicle is traveling. The traveling wind introduced into the heat exchanger 18 can be guided to the installation portion of the heat exchanger 18 by the shielding plate 21. Therefore, even when the heat exchanger 18 is disposed on the rear side of the vehicle as described above, there is an advantage that the heat exchange function of the heat exchanger 18, that is, the cooling function of the engine coolant can be sufficiently exhibited. is there.

  4 and 5 show a second embodiment of the vehicle powertrain arrangement structure according to the present invention. In the second embodiment, an exhaust system auxiliary device 27 including the exhaust gas purifying catalyzer and the like disposed on the front side of the engine main body 12, the heat exchanger main body 16 including the radiator, the cooling fan 17, and the like. The point from which the heat insulation means 30 is provided between the heat exchangers 18 provided with is different from the said 1st Embodiment. Specifically, it is generated by heat exchange in the heat exchanger 18 by covering the upper surface portion and the rear surface portion of the exhaust system auxiliary machine 27 with the heat shielding means 30 made of a heat-insulating plate or the like. The heat is reliably prevented from reaching the exhaust system auxiliary device 27.

  According to the above-described configuration, the heat generated by the heat exchange of the engine cooling water in the heat exchanger 18 during the traveling of the vehicle is affected by the exhaust system auxiliary device 27 including the exhaust gas purifying catalyzer. The heat shield means 30 can effectively prevent the wind from flowing, and the traveling wind introduced into the engine room 2 from the lower part of the front grille 9 is supplemented to the exhaust system by the guide action of the heat shield means 30. It can supply efficiently to the installation part of the machine 27. Therefore, it is effective that the exhaust system auxiliary device 27 is thermally deteriorated early due to the heat influence of the heat exchanger 18 or is heated to a temperature higher than the appropriate reaction temperature to reduce the exhaust gas purification performance. There is an advantage that can be prevented.

  FIG. 6 shows a third embodiment of a vehicle powertrain arrangement structure according to the present invention. In the third embodiment, the lower end portion of the cooling fan 17 constituting the heat exchanger 18 is arranged to be offset below the heat exchanger body 16, and the exhaust gas purifying catalyzer or the like is disposed in front of the offset portion. The exhaust system auxiliary machine 27 which consists of is arrange | positioned. In addition, a cooling air guide plate 31 made of a heat-insulating plate or the like is provided so as to cover the installation portion of the exhaust system auxiliary device 27, and the installation portion of the exhaust system auxiliary device 27 is provided on the guide plate 31 And an air duct 32 connecting the offset portion of the cooling fan 17 is provided, and a part of the traveling wind introduced into the engine room 2 from the opening of the front grill 9 during the traveling of the vehicle passes through the air duct 32. Through which the cooling fan 17 is installed.

  By offsetting the lower end portion of the cooling fan 17 below the heat exchanger body 16 as described above, the exhaust system auxiliary device 27 is placed in front of the lower end portion of the cooling fan 17 positioned below the heat exchanger body 16. When the vehicle is traveling, the traveling wind that is introduced into the engine room 2 from the opening of the front grill 9 and whose speed is increased according to the suction force of the cooling fan 17 is It is positively supplied to the installation part of the exhaust system auxiliary machine 27. Therefore, when the vehicle is traveling, the exhaust system auxiliary device 27 can be efficiently cooled to prevent the thermal deterioration and the purification performance from being more effectively prevented.

  In particular, as shown in the third embodiment, when the air duct 32 is provided so as to connect the installation part of the exhaust system auxiliary machine 27 and the offset part of the cooling fan 17, the operation of the cooling fan 17 is performed. Since the suction force generated sometimes can be effectively applied to the installation part of the exhaust system auxiliary machine 27, the traveling wind introduced into the engine room 2 from the opening of the front grill 9 is exhausted when the vehicle is traveling. The exhaust system auxiliary machine 27 can be cooled more effectively by supplying more actively to the installation part of the system auxiliary machine 27.

  The exhaust system auxiliary device 27 is arranged in front of the upper end portion of the cooling fan 17 positioned above the heat exchanger body 16 by offsetting the upper end portion of the cooling fan 17 above the heat exchanger body 16. Alternatively, the upper and lower ends of the cooling fan 17 may be offset above and below the heat exchanger main body 16 to offset the upper end of the cooling fan 17 positioned above or below the heat exchanger main body 16, respectively. The exhaust system auxiliary machine 27 may be arranged in either one of the front part and the front part of the lower end part.

  FIG. 7 shows a fourth embodiment of a vehicle powertrain arrangement structure according to the present invention. In the fourth embodiment, a cooler 33 for engine oil is disposed in front of an exhaust system auxiliary machine 27 composed of the exhaust gas purifying catalyzer and the like, and heat exchange with an installation part of the exhaust system auxiliary machine 27 is performed. The heat shield means 30 which consists of a board | plate material etc. which has heat insulation between the container 18 is arrange | positioned. A flap 34 that covers the front surface of the cooler 33 and the exhaust system auxiliary machine 27 so as to be openable and closable is connected to the front end of the heat shield means 30 via a hinge member 35, and the hinge member 35 is supported as a fulcrum. The bumper reinforcement 10 or the like is provided with a driving means 36 composed of a driving cylinder or the like that swings and displaces the flap 34.

  Immediately after the engine is started, as shown by the phantom line in FIG. 7, the front end portion of the flap 34 is in the lowered state, and the front surface of the cooler 33 and the exhaust system auxiliary device 27 is closed by the flap 34. Then, when it is confirmed that the cooler 33 and the exhaust system auxiliary machine 27 have been warmed up according to the detection signal output from an engine temperature sensor or the like (not shown), the control means 37 sends the driving means 36 to the drive means 36. By outputting the operation command signal, as shown by a solid line in FIG. 7, the tip end portion of the flap 34 is driven up, and the front surface of the installation portion of the cooler 33 and the exhaust system auxiliary device 27 is opened. .

  In the fourth embodiment, since the engine oil cooler 33 is disposed on the front side of the exhaust system auxiliary machine 27 composed of an exhaust gas purifying catalyzer or the like, the thermal influence of the engine body 12 that becomes a high temperature state when the vehicle travels. Prevents the cooler 33 from reaching the cooler 33 by the heat exchanger 18 or the like, so that the cooler 33 can be quickly deteriorated by the heat effect of the engine body 12 or the cooling performance of the engine oil can be effectively reduced. There is an advantage that can be prevented. In addition, a heat shield means 30 made of a heat-insulating plate material or the like is disposed between the installation portion of the exhaust system auxiliary device 27 and the heat exchanger 18, and the cooler 33 and the exhaust system auxiliary device are disposed at the tip thereof. 27 is disposed so as to open and close the front surface of the installation portion 27, and immediately after the engine is started, the front end portion of the flap 34 is lowered to close the front surface of the installation portion of the cooler 33 and the exhaust system auxiliary device 27. Due to the configuration, air introduced into the engine room 2 from the opening of the front grille 9 according to the suction force of the cooling fan 17 is prevented from being supplied to the installation part of the cooler 33 and the exhaust system auxiliary machine 27. As a result, it is possible to effectively cool the engine and activate the exhaust system auxiliary device 27 by suppressing the cooling of these components.

  On the other hand, when it is confirmed according to the detection signal from the engine temperature sensor or the like that the warming of the cooler 33 and the exhaust system auxiliary machine 27 has been completed while the vehicle is running, the tip of the flap 34 is raised. By opening the front surface of the installation part of the cooler 33 and the exhaust system auxiliary machine 27, the traveling wind introduced into the engine room 2 from the opening of the front grille 9 according to the suction force of the cooling fan 17 and the like is sent to the cooler 33. And can be supplied to the installation part of the exhaust system auxiliary machine 27. Therefore, the exhaust system auxiliary machine 27 and the engine oil cooler 33 can be efficiently cooled while the vehicle is traveling, and the exhaust system auxiliary machine 27 and the cooler 33 are affected by the heat exchanger 18. There is an advantage that can be effectively prevented by the heat shield means 30.

  FIG. 8 shows a fifth embodiment of the vehicle powertrain arrangement according to the present invention. In the fifth embodiment, a branch passage 39 that branches from a discharge pipe 38 that leads hot water led out from the engine body 12 to the heat exchanger body 16, and on-off valves 40 and 41 provided in the branch passage 39, and A thermal heater 42 and a control means 37 for outputting a control signal for opening and closing the on-off valves 40 and 41 are provided, and the thermal heater 42 is installed in the vicinity of the exhaust system auxiliary machine 27. The control means 37 opens the on-off valves 40 and 41 immediately after starting the engine, supplies hot water to the thermal heater 42, and responds to a detection signal output from an engine temperature sensor or the like (not shown). When it is confirmed that the cooler 33 and the exhaust system auxiliary machine 27 have been warmed up, the on-off valves 40 and 41 are closed and the supply of hot water to the hot heater 42 is stopped.

  According to the above configuration, high-temperature cooling water (hot water) supplied to the heat exchanger body 16 from the engine body 12 whose temperature tends to rise early after the engine is started is supplied to the thermal heater 42. As a result, the exhaust system auxiliary equipment 27 including the exhaust gas purification catalyzer can be activated at an early stage. Further, when the vehicle is running, there is an advantage that the exhaust system auxiliary machine 27 can be prevented from being excessively heated by stopping the supply of hot water to the thermal heater 42.

  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 configured by disposing an exhaust system auxiliary machine 27 composed of an exhaust gas purification catalyzer in front of the engine cooling heat exchanger 18. It is desirable to be able to prevent early deterioration due to the thermal influence of the engine main body 12 and to effectively prevent the exhaust gas purification performance from being deteriorated by being heated to a temperature higher than the appropriate reaction temperature. .

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 the principal part structure of the said powertrain arrangement | positioning structure. 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. It is side surface sectional drawing which shows 4th Embodiment of the powertrain arrangement structure of the vehicle which concerns on this invention. It is side surface sectional drawing which shows 5th 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 16 Heat exchanger main body 17 Cooling fan 18 Heat exchanger 27 Exhaust system auxiliary machine 28 Undercover (cooling means)
30 Heat shielding means 32 Air guide duct 33 Cooler 42 Thermal heater

Claims (8)

  In the 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, The power train includes an engine body vertically disposed in the engine room, and a transmission connected to the rear of the engine body. A heat exchanger for cooling the engine is disposed in front of the engine body, and the engine body. An exhaust pipe extending from the vehicle to the front side of the vehicle body, and an exhaust system auxiliary device provided in the exhaust pipe is provided in front of the heat exchanger. Construction structure.   2. The vehicle powertrain arrangement structure according to claim 1, further comprising cooling means for guiding the traveling wind of the vehicle to the exhaust system auxiliary machine to cool the exhaust system auxiliary machine.   The vehicle powertrain arrangement structure according to claim 1 or 2, wherein a heat shield means is provided between the exhaust system auxiliary machine and the heat exchanger.   The heat exchanger is provided with a heat exchanger main body and a cooling fan for supplying cooling air to the heat exchanger main body, and the upper end or lower end of the cooling fan is at least above or below the heat exchanger main body. The vehicle powertrain arrangement structure according to any one of claims 1 to 3, wherein the exhaust system auxiliary machine is arranged on one side and the exhaust system auxiliary machine is arranged in front of the offset part. .   5. The vehicle powertrain arrangement structure according to claim 4, wherein a cooling air guide duct is provided so as to connect the installation portion of the exhaust system auxiliary device and the offset portion of the cooling fan.   The vehicle powertrain arrangement structure according to any one of claims 1 to 5, wherein a cooler for engine oil is arranged in front of the exhaust system auxiliary machine.   The vehicle powertrain arrangement according to any one of claims 1 to 6, wherein a thermal heater for heating the exhaust system auxiliary machine is provided in the vicinity of the exhaust system auxiliary machine. Construction.   The vehicle powertrain arrangement structure according to any one of claims 1 to 7, wherein the exhaust system auxiliary device is a catalyzer for purifying exhaust gas.

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