JP2009029149A - Powertrain arranging 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 exhaust system auxiliary equipment from being influenced by the heat of an engine body. <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 extending to the forward side of a vehicle body from the power train 11 forward of the power train 11, exhaust system auxiliary equipment 27 provided in the exhaust pipe and arranged forward of the heat exchanger 18, and a temperature control means composed of a cooling fan control means 33 for controlling a temperature of the exhaust system auxiliary equipment 27 or the like. <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 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 The heat exchanger for cooling the power train (cooling unit) is provided so as 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. ) Is arranged.
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 for heat train cooling heat exchange. When the engine is installed, the exhaust system auxiliary machine can be heated and activated at an early stage after the engine is started. 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. Is disposed in front of the power train, and 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 provided on the exhaust pipe. And an exhaust system auxiliary machine disposed in front of the heat exchanger, and a temperature control means for controlling the temperature of the exhaust system auxiliary machine.

  According to a second aspect of the present invention, in the vehicle powertrain arrangement structure according to the first aspect, a cooling fan is provided in the heat exchanger, and the cooling fan and the heat exchanger main body are vertically arranged. They are arranged so as to overlap.

  According to a third aspect of the present invention, in the vehicle powertrain arrangement structure according to the second aspect of the present invention, a cooling fan control means for controlling the operating state of the cooling fan in accordance with the traveling state of the vehicle is provided. .

  According to a fourth aspect of the present invention, in the vehicle powertrain arrangement structure according to the third aspect, the cooling fan control means controls the rotation direction of the cooling fan in accordance with the running state of the vehicle. The cooling air is guided to the heat exchanger body when the vehicle is traveling, and is guided to the exhaust system auxiliary machine when the vehicle is stopped.

  According to a fifth aspect of the present invention, in the vehicle powertrain arrangement structure according to any one of the first to fourth aspects, the supply amount of the traveling wind introduced into the engine room to the exhaust system auxiliary machine is reduced. A traveling air volume control means for controlling is provided.

  According to a sixth aspect of the present invention, in the vehicle powertrain arrangement structure according to any one of the first to fifth aspects of the present invention, the travel air volume control means is configured to provide a travel wind for the exhaust system auxiliary machine after the vehicle is started. It is comprised so that the control which decreases the supply amount of may be performed.

  The invention according to claim 7 is the vehicle power train arrangement structure according to any one of claims 1 to 6, wherein the power train is arranged vertically in an engine room. And a transmission connected to the rear thereof.

  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 power train, and a part of the power train is disposed in the recessed portion of the dash panel. By doing so, 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, so that the center of gravity of the vehicle is positioned on the center side of the vehicle body. Thus, it is possible to effectively reduce the yaw moment of inertia acting when the vehicle is running and improve the steering stability. And the temperature control means can maintain the temperature of the exhaust system auxiliary machine properly and can fully exert its function, and the power train is located on the rear side of the vehicle, so that there is a margin in space. By providing the exhaust system auxiliary machine in the engine room, there is an advantage that the heat influence of the exhaust system auxiliary machine can be effectively prevented from reaching the vehicle interior.

  The invention according to claim 2 is advantageous in that the exhaust system auxiliary equipment can be efficiently cooled by the cooling air supplied when the cooling fan is operated to effectively prevent thermal degradation.

  In the invention according to claim 3, the operation state of the cooling fan is controlled by the cooling fan control means in accordance with the running state of the vehicle, and the air volume of the cooling air supplied to the exhaust system auxiliary machine is adjusted, thereby There is an advantage that the temperature of the system auxiliary machine can be effectively controlled in accordance with the traveling state of the vehicle.

  In the invention according to claim 4, the exhaust system auxiliary machine and the exhaust system auxiliary machine are respectively controlled by controlling the rotation direction of the cooling fan so that the cooling air of the cooling fan is guided to the heat exchanger main body when the vehicle travels. By controlling the rotation direction of the cooling fan so that the cooling air of the cooling fan can be guided to the exhaust system auxiliary machine when the vehicle is stopped, the temperature of the exhaust system auxiliary machine can be reduced. There is an advantage that it can be appropriately controlled according to the running state.

  In the invention which concerns on Claim 5, there exists an advantage that the temperature of the said exhaust system auxiliary machine can be controlled appropriately by controlling the supply amount of the running wind supplied to an exhaust system auxiliary machine by the said running air volume control means.

  The invention according to claim 6 has an advantage that the exhaust system auxiliary equipment in the cold state can be activated at an early stage by reducing the travel air volume supplied to the exhaust system auxiliary equipment after the engine is started.

  In the invention according to claim 7, since the power train having the engine main body and the transmission, which is a heavy article 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 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. 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 heating 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. 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 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 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.

  The cooling fan 17 constituting the heat exchanger 18 is disposed with its lower end being offset below the heat exchanger body 16, and an exhaust system comprising the exhaust gas purifying catalyzer in front of the offset portion. An auxiliary machine 27 is provided. 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. An air guide duct 32 is provided so as to connect the offset portion (lower portion) of the cooling fan 17.

  An exhaust system comprising the above-described exhaust gas purifying catalyzer and the like by the cooling fan 17, the cooling fan control means 33 for controlling the rotation direction of the cooling fan 17 in accordance with the traveling state of the vehicle, and the air guide duct 32. A temperature control means for controlling the temperature of the auxiliary machine 27 and the like is configured. That is, the cooling fan control means 33 determines whether or not the engine is in a warm-up operation state after starting the engine according to a detection signal of the engine temperature sensor 34 that detects the engine temperature, and may be in the warm-up operation state. When confirmed, an operation stop signal for stopping the operation of the cooling fan 17 is output to the drive motor of the cooling fan 17 to prevent the heat exchanger body 16 from being cooled by the cooling air. ing.

  The cooling fan control means 33 determines whether the vehicle is in a running state or in a stopped state according to a detection signal of a wheel sensor 35 that detects the rotation state of the wheel after the warm-up operation is finished. When the cooling fan 17 is rotated forward when the vehicle is confirmed to be in a traveling state, the traveling wind introduced into the engine room 2 is sucked from the opening of the front grille 9, and this is used as the cooling wind. When it is supplied to the installation portion of the exhaust system auxiliary machine 27 and it is confirmed that the vehicle is in a stopped state, the cooling fan 17 is rotated in the reverse direction, as shown by the broken line arrow in FIG. Control is performed so that cooling air is blown directly onto the heat exchanger body 16 via the air duct 32.

  In the above configuration, when the engine is in a warm-up operation state after the engine is started, the cooling fan control means 33 executes control for stopping the operation of the cooling fan 17, thereby cooling the exhaust system auxiliary machine 27. The wind supply is stopped. For this reason, the exhaust system auxiliary machine 27 composed of the exhaust gas purification catalyzer and the like in the cold state immediately after the engine is started is suppressed from being cooled by the cooling air, and the temperature of the exhaust system auxiliary machine 27 is suppressed. Will rise early and be activated.

  And in the running state of the vehicle after the warm-up operation is finished, the cooling fan 17 is in the activated state and rotates forward, so that the running wind introduced into the engine room 2 from the opening of the front grill 9 is The shield plate 21 guides the heat exchanger 18 to the installation section side, and the traveling wind is supplied to the installation section of the heat exchanger 18 according to the suction force of the cooling fan 17 so that the engine cooling water is supplied. Heat exchange is actively 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 cooling wind guide plate 31 as shown by the arrow in FIG. At the same time, by being sucked to the rear side of the vehicle body through the air guide duct 32, traveling wind is blown to the exhaust system auxiliary machine 27 at a high speed, and the exhaust system auxiliary machine 27 is effectively cooled. Become.

  On the other hand, when the vehicle is stopped after the warm-up operation is finished, the cooling fan 17 is controlled to reversely rotate in the cooling fan control means 33, so that the guidance is performed as shown by the broken arrow in FIG. Cooling air is blown directly onto the heat exchanger body 16 via the air duct 32. Therefore, the exhaust system auxiliary machine 27 is effectively cooled by the cooling air even in a situation where there is no traveling wind introduced into the engine room 2 from the opening of the front grill 9.

  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 a front side of the vehicle body extend from the engine body 12 constituting the power train 11 in front of the engine body 12 constituting the power train 11. When an exhaust pipe 22 is provided and an exhaust system auxiliary 27 provided in the exhaust pipe 22 is provided in front of the heat exchanger 18, the exhaust system auxiliary 27 is connected to the engine body 12. There is an advantage that the power train 11 is positioned on the rear side of the vehicle while the influence of heat is suppressed, and the yaw moment of inertia during the traveling of the vehicle 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. Further, since it can be further reduced, there is an advantage that an even more significant improvement in steering stability can be obtained.

  Since the temperature control means including the cooling fan 17 and the cooling fan control means 33 as described above is configured to control the temperature of the exhaust system auxiliary equipment 27 including the exhaust gas purification catalyzer and the like, after the engine is started In the warm-up operation state, the exhaust system auxiliary machine 27 can be heated and activated early, and after the warm-up operation is finished, the exhaust system auxiliary machine 27 is cooled to an appropriate temperature. Thus, there is an advantage that the exhaust system auxiliary machine 27 can be maintained at an appropriate reaction temperature while preventing thermal deterioration.

  That is, in the first 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 device is disposed in front of the offset portion. By providing the exhaust system auxiliary machine 27 composed of a catalyzer or the like, the vehicle is introduced into the engine room 2 from the opening of the front grille 9 when the vehicle is running, and the speed thereof according to the suction force of the cooling fan 17 is increased. Since the traveling wind having an increased amount is supplied to the installation part of the exhaust system auxiliary machine 27 at a high speed, the exhaust system auxiliary machine 27 is efficiently cooled to reduce its thermal deterioration and purification performance. Can be prevented more effectively.

  In the first embodiment, 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 exhaust system auxiliary plate is provided on the guide plate 31. Since the air duct 32 connecting the installation part of the machine 27 and the offset part of the cooling fan 17 is provided, the suction force generated when the cooling fan 17 is operated is effectively applied to the installation part of the exhaust system auxiliary machine 27. Therefore, when the vehicle is traveling, the traveling wind introduced into the engine room 2 from the opening of the front grill 9 is more actively supplied to the installation portion of the exhaust system auxiliary device 27 to supplement the exhaust system. There is an advantage that the machine 27 can be cooled more effectively.

  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.

  Further, in the first embodiment, the cooling fan control means 33 for controlling the operating state of the cooling fan 17 according to the traveling state of the vehicle is provided, and the cooling fan control means 33 is in a warm-up operation state after the engine is started. When it is confirmed that the control is performed such as stopping the operation of the cooling fan 17, the exhaust system supplement comprising the exhaust gas purifying catalyzer and the like during the warm-up operation after the engine is started is configured. The exhaust system auxiliary machine 27 can be activated early by preventing the machine 27 from being cooled by the cooling air.

  Further, the cooling fan control means 33 controls the rotation direction of the cooling fan 17 according to the traveling state of the vehicle, and the cooling fan 17 is rotated forward to guide the cooling air to the heat exchanger body 16 when the vehicle is traveling. Therefore, the running air introduced into the engine room 2 from the opening of the front grille 9 is supplied to the installation portion of the heat exchanger 18 according to the suction force of the cooling fan 17, whereby the engine cooling water is supplied. Heat exchange can be actively performed, and the traveling wind is blown onto the exhaust system auxiliary equipment 27 at a high speed to effectively cool the exhaust system auxiliary equipment 27 and prevent the temperature from excessively rising. be able to. On the other hand, when the vehicle is stopped, the cooling fan 17 is rotated in the reverse direction so that the cooling air is guided to the exhaust system auxiliary device 27. Therefore, even in a situation where there is no traveling wind introduced into the engine room 2, the exhaust system There is an advantage that the auxiliary machine 27 can be effectively cooled to prevent the temperature from rising excessively.

  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.

  4 and 5 show a second embodiment of the vehicle powertrain arrangement structure according to the present invention. In the second embodiment, a heat shield means 36 made of a heat-insulating plate material or the like is disposed between the installation portion of the exhaust system auxiliary machine 27 and the heat exchanger 18, and the heat shield means 36 A flap 37 that covers the front of the installation portion of the exhaust system auxiliary machine 27 so as to be openable and closable is provided at the front end via a hinge member 38, and a drive cylinder that swings and displaces the flap 37 with the hinge member 38 as a fulcrum. The driving means 39 comprising the above is provided in the bumper reinforcement 10 or the like. The exhaust of the traveling wind introduced into the engine room 2 by the heat shield means 36, the flap 37, the hinge member 38 and the drive means 39, and the flap control means 40 that outputs a control signal to the drive means 39. Travel air volume control means for controlling the supply amount to the system auxiliary machine 27 is configured, and the temperature control of the exhaust system auxiliary machine 27 according to the running state of the vehicle is appropriately executed by this travel air volume control means. Yes.

  That is, when it is confirmed in the flap control means 40 that the engine is in the warm-up operation state after the engine is started according to the detection signal output from the engine temperature sensor 34 that detects the engine temperature, the virtual line in FIG. As shown, a control signal for lowering the tip of the flap 37 with the drive rod of the drive means 39 extended is output from the flap control means 40 to the drive means 39, so that the installation part of the exhaust system auxiliary machine 27 is shown. A control for closing the front surface with a flap 37 is executed. As a result, the supply amount of the traveling wind supplied to the installation part of the exhaust system auxiliary machine 27 is reduced, and the cooling of the exhaust system auxiliary machine 27 by the running wind is suppressed and the warming up is promoted.

  Further, when it is confirmed that the warm-up operation has been completed in accordance with the detection signal of the engine temperature sensor 34, the control signal for causing the drive rod to be contracted from the control means 40 to the drive means 39. Is output, as shown by the solid line in FIG. 4, control is performed to drive up the tip of the flap 37 to open the front of the installation part of the exhaust system auxiliary machine 27. As a result, the supply amount of traveling wind supplied to the installation part of the exhaust system auxiliary machine 27 increases, and the exhaust system auxiliary machine 27 is effectively cooled by this running wind, and the temperature rise is suppressed.

  As described above, the heat shield means 30 made of a heat-insulating plate or the like is disposed between the installation portion of the exhaust system auxiliary machine 27 and the heat exchanger 18, and the above and the exhaust system auxiliary machine 27 are disposed at the tip thereof. A flap 37 that covers the front surface of the installation portion of the exhaust system 27 is disposed so as to be openable and closable, and after the engine is started, the front end portion of the flap 37 is lowered to close the front surface of the installation portion of the exhaust system auxiliary machine 27. By preventing the air introduced into the engine room 2 from the opening of the front grille 9 according to the suction force of the fan 17 from being supplied to the installation part of the exhaust system auxiliary machine 27, this exhaust system auxiliary is achieved. The engine 27 can be prevented from being cooled and the engine warm-up and the activation of the exhaust system auxiliary machine 27 can be effectively promoted.

  On the other hand, when it is confirmed according to the detection signal of the engine temperature sensor 34 that the exhaust system auxiliary machine 27 has been warmed up, the tip of the flap 37 is raised and the exhaust system auxiliary machine 27 is installed. By opening the front part, the traveling wind introduced into the engine room 2 from the opening of the front grill 9 can be supplied to the installation part of the exhaust system auxiliary device 27 when the vehicle is traveling. Therefore, the exhaust system auxiliary machine 27 can be efficiently cooled while the vehicle is running, and the heat shield means 30 effectively prevents the exhaust system auxiliary machine 27 from being influenced by the heat exchanger 18. There is an advantage that you can.

  FIG. 6 shows a third embodiment of a vehicle powertrain arrangement structure according to the present invention. In the third embodiment, a branch passage 42 branched from a lead-out pipe 41 for leading hot water led out from the engine body 12 of the power train 11 to the heat exchanger body 16, and an on-off valve provided in the branch passage 42 43 and 44 and a temperature heater 45, and a temperature control means comprising an opening / closing control means 46 for outputting a control signal for opening and closing the on-off valves 43 and 44. The temperature heater 45 is installed in the vicinity of the exhaust system auxiliary device 27. It is a thing. The open / close control means 46 opens the open / close valves 43, 44 after the engine is started to supply hot water to the thermal heater 45, and in response to the detection signal output from the engine temperature sensor 34, the exhaust system supplement. When it is confirmed that the warm-up of the machine 27 is completed, the on-off valves 43 and 44 are closed to stop the supply of hot water to the warm heater 45.

  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 45. 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 45.

  Moreover, in each said embodiment, a part of powertrain 12 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 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car compartment 2 Engine room 11 Powertrain 12 Engine main body 13 Transmission 16 Heat exchanger main body 17 Cooling fan 18 Heat exchanger 20 Exhaust pipe 27 Exhaust system auxiliary equipment 33 Cooling fan control means 37 Flap (travel air volume control means)
39 Driving means (traveling air volume control means)
40 flap control means (travel air volume control means)
45 Thermal heater (temperature control means)

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, 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 and in front of the heat exchanger. A powertrain arrangement structure for a vehicle, comprising: an exhaust system auxiliary machine arranged; and temperature control means for controlling a temperature of the exhaust system auxiliary machine.   The vehicle power train according to claim 1, wherein the heat exchanger is provided with a cooling fan, and the cooling fan and the heat exchanger main body are arranged so as to overlap in the vertical direction. Arrangement structure.   3. The vehicle powertrain arrangement structure according to claim 2, further comprising cooling fan control means for controlling an operating state of the cooling fan in accordance with a running state of the vehicle.   The cooling fan control means controls the rotation direction of the cooling fan according to the running state of the vehicle, thereby leading the cooling air to the heat exchanger body when the vehicle is running and leading to the exhaust system auxiliary machine when the vehicle is stopped. 4. The vehicle powertrain arrangement structure according to claim 3, wherein the vehicle powertrain arrangement structure is configured as described above.   The vehicle power train according to any one of claims 1 to 4, further comprising traveling air volume control means for controlling a supply amount of traveling air introduced into the engine room to the exhaust system auxiliary equipment. Arrangement structure.   The said traveling air volume control means is comprised so that the control which reduces the supply amount of the traveling wind with respect to the said exhaust system auxiliary machine after starting of a vehicle may be performed. The vehicle powertrain arrangement structure as described.   The said power train was provided with the engine main body arrange | positioned by the vertical installation type in an engine room, and the transmission connected to the back, The one of Claims 1-6 characterized by the above-mentioned. Vehicle powertrain arrangement structure.   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.

Images