JP2009040182A - Power train arrangement structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve steering stability by arranging a power train at the rear side of a vehicle, and to properly perform a layout of an exhaust system auxiliary machinery. <P>SOLUTION: In this vehicle, a part of the power train 11 for driving wheels is arranged in a recessed part 5 recessed to the rear side of a vehicle body provided in a dash panel 3 for partitioning a cabin 1 and an engine room 2. This power train 11 is provided with an engine body 12 arranged in a vertically installed type in the engine room 2, and a transmission 13. A heat exchanger 18 for cooling the engine is arranged in front of an engine body 12. An exhaust pipe 22 extending from the engine body 12 to the front side of a vehicle body is arranged between the heat exchanger 18 and the engine body 12. The exhaust system auxiliary machinery 26 provided in the exhaust pipe 22 is arranged at a position adjacent to a lower part of a front part of the engine body 20. The engine body 12 is constituted to be warmed up by the heat of the exhaust system auxiliary machinery 26. <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 to drive wheels, an exhaust pipe of an engine body is installed so as to extend rearward through the front of the engine, and an upstream for purifying exhaust gas is disposed upstream of the exhaust pipe. A side catalyzer (catalyst) is provided and disposed on the front side of the power train, and a heat exchanger (cooling unit) for cooling the engine having a radiator and a cooling fan is disposed on the front side thereof. An exhaust gas purifying downstream side catalyzer is disposed downstream of an exhaust pipe introduced into a tunnel portion of a room floor.
JP 2003-326981 A

  As disclosed in the above-mentioned Patent Document 1, an exhaust system auxiliary machine comprising an upstream side catalyzer for exhaust gas purification provided in an exhaust pipe of an engine body is extended in the vehicle width direction on the front side of the power train. When installed, the power train can be positioned on the rear side of the vehicle body, compared to the case where the upstream side catalyzer is installed on the rear side of the power train, thus reducing the yaw moment of inertia during vehicle travel. Thus, the steering stability can be improved. However, in the vehicle engine arrangement structure disclosed in Patent Document 1, as shown in FIGS. 6 and 7, a tunnel portion 6 in which a downstream side catalyzer α for purifying exhaust gas is provided at the center bottom of the vehicle interior. Since a heat shield for preventing the reaction heat generated in the downstream side catalyzer α from reaching the occupant's feet is provided, or the occupant seat 7 is disposed upward. It is necessary to take measures such as separating from the downstream side catalyzer α. Therefore, there is a problem that the structure of the vehicle body is complicated and the manufacturing cost is increased, or the vehicle height is increased and the degree of freedom in vehicle body design is limited.

  In addition, by downsizing the upstream side catalyzer disposed in the engine room for purifying the exhaust gas, the downstream side catalyzer α disposed in the tunnel portion is downsized, or the downstream side catalyzer α is omitted. However, in this case, it is difficult to properly lay out the large exhaust system auxiliary device 26 composed of the upstream side catalyzer for exhaust gas purification in a limited space in the engine room. There is a problem that it is necessary to prevent the reaction heat generated in the exhaust system auxiliary device 26 from reaching the passenger compartment.

  The present invention has been made in view of the above-described problems, and it is possible to improve steering stability by arranging a power train on the rear side of a vehicle, and to appropriately lay out an exhaust system auxiliary machine. It is an object of the present invention to provide a powertrain arrangement structure for a vehicle that can perform the above.

  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 the engine room, and a transmission connected to the rear of the engine body. An exhaust pipe extending from the engine body to the front side of the vehicle body is disposed between the heat exchanger and the engine body, and an exhaust system auxiliary provided in the exhaust pipe is disposed between the heat exchanger and the engine body. A machine is disposed at a position close to the front lower part of the engine main body, and the engine main body is configured to be warmed up by heat 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, the exhaust system auxiliary device is disposed at a position close to a front end portion of an oil pan provided at the bottom of the engine body. It was established.

  According to a third aspect of the present invention, in the vehicle powertrain arrangement structure according to the first aspect, the exhaust system auxiliary machine is arranged at a position close to the lower front surface of the cylinder block of the engine body. is there.

  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 the exhaust system auxiliary machine can be cooled by the cooling fan at least after the warm-up of the engine is completed.

  According to a fifth aspect of the present invention, in the vehicle powertrain arrangement structure according to the fourth aspect, the exhaust system auxiliary device and the cooling fan are arranged so as to overlap each other in a front view.

  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, 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, the engine body and 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. 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, when the engine is started, the engine main body is heated according to the reaction heat of the exhaust system auxiliary equipment, so that the engine warm-up performance can be effectively improved while the engine start-up performance is stabilized. .

  In the invention according to claim 2, when the engine is started, the oil pan provided at the lower end of the engine body is heated in accordance with the reaction heat of the exhaust system auxiliary equipment, so that it is housed in the interior. The temperature of the lubricating oil, which is difficult to heat, can be raised quickly, so that the engine's warm-up performance is effectively improved while the engine's startability is stabilized by fully exerting the lubricating function of each part of the engine. Can be improved.

  In the invention according to claim 3, when starting the engine, the cylinder block of the engine body is heated in accordance with the reaction heat of the exhaust system auxiliary machine, so that the engine startability is stabilized and the engine warm-up property is improved. Can be improved effectively.

  In the invention according to claim 4, by operating the cooling fan after the engine is warmed up, the heat exchange function in the heat exchanger can be sufficiently exerted, and exhaust is performed by the cooling air supplied from the cooling fan. There is an advantage that the system auxiliary machine can be efficiently cooled and its thermal deterioration can be effectively prevented.

  In the invention according to claim 5, when necessary, the cooling fan cooling air can be sufficiently supplied to the installation part of the exhaust system auxiliary machine to cool the exhaust system auxiliary machine more effectively.

  In the invention according to claim 6, the exhaust gas purification catalyzer whose temperature rises early when the engine is started is disposed below the front of the engine body, so that the heat can be efficiently used for warming up the engine body. In addition to being usable, there is an advantage that the thermal influence of the catalyzer can be effectively prevented from reaching the passenger compartment.

  1 to 4 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 at the vehicle width direction center portion, and bulges upward in the vehicle width direction center portion of the floor panel 4. A tunnel portion 6 is formed, and passenger seats 7 including a driver seat and a passenger seat are disposed on the left and right sides of the tunnel portion 6.

  A bonnet 8 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 8, a front grill 9 having an opening for running wind intake is disposed. A bumper reinforcement 10 is installed behind the front grille 9 so as to extend in the vehicle width direction, and a pair of left and right front side frames 20 are arranged at the left and right ends so as to extend to the rear side of the vehicle body. It is installed. 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 addition, a heat exchanger 18 for cooling the engine including a heat exchanger main body 16 made of a radiator and the like, and a cooling fan 17 positioned on the rear side of the heat exchanger main body 16 is provided at the front portion of the engine room 2. It is installed in a rearward tilt posture at a predetermined angle at 12 front positions.

  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 toward the front side of the vehicle body, and a side extension 24 that extends from the front end portion along the lower front surface of the engine body 12 in the vehicle width direction. And a rear extension 25 extending from the side end portion to the rear side of the vehicle body, and a rear portion of the rear extension 25 is introduced into the tunnel portion 6.

  In the side extension 24 of the exhaust pipe 22, an exhaust system auxiliary device 26 made of an exhaust gas purifying catalyzer or the like is located near the lower front of the engine body 12, specifically, the engine body 12. Is disposed so as to extend in the vehicle width direction at a position close to the front end of the oil pan 27 provided at the bottom. In addition, the installation heights are set so that the exhaust system auxiliary device 26 and the cooling fan 17 of the heat exchanger 18 are superposed with each other when viewed from the front. In FIG. 1, reference numeral 28 denotes cooling fan control means for outputting an operation command signal to the cooling fan 17, and in FIG. 3, reference numeral 29 denotes a suspension cross member to which a suspension arm for the front wheels is attached. is there.

  In the above configuration, when it is confirmed in the cooling fan control means 28 that the engine is in the warm-up operation state after the engine is started according to the detection signal of the engine temperature sensor 30 that detects the engine temperature, the engine cooling water Since the temperature is low, control is performed to turn off the cooling fan 17 of the heat exchanger 18. In this state, the high-temperature exhaust gas led out from the combustion chamber of the engine to the exhaust pipe 22 is supplied to the installation part of the exhaust system auxiliary machine 26 composed of the above-described exhaust gas purifying catalyzer and the like. The exhaust gas is purified at, and the temperature of the exhaust system auxiliary machine 26 rises due to the reaction heat. In addition, the oil pan 27 is heated according to the reaction heat of the exhaust system auxiliary machine 26, so that the temperature of the lubricating oil accommodated therein rises early.

  In the cooling fan control means 28, it is determined that the vehicle is in a stopped state or a low-speed traveling state after the warm-up is completed according to detection signals from the wheel speed sensor 31 and the engine temperature sensor 30 that detect the traveling state of the vehicle. If confirmed, an operation command signal is output to the cooling fan 17 and the cooling fan 17 is in an operating state, so that the engine room 2 is cooled from the opening of the front grill 9 according to the suction force. Wind is introduced, and this cooling air is supplied to the installation section of the heat exchanger 18 to actively exchange heat of the engine cooling water, and is also supplied to the installation section of the exhaust system auxiliary machine 26 to this exhaust. The system auxiliary machine 26 is cooled.

  Further, the cooling fan control means 28 indicates that the warm-up operation after starting the engine is finished according to the detection signals of the wheel speed sensor 31 and the engine temperature sensor 30 and the vehicle is not in a stopped state or a low-speed running state. If it is confirmed in step S4, control for stopping the cooling fan 17 is executed. As a result, when the vehicle travels after the warm-up is completed, traveling wind is introduced into the engine room 2 through the opening of the front grill 9 and supplied to the installation portion of the exhaust system auxiliary device 26. The machine 26 is cooled, and the traveling wind is introduced into the tunnel portion 6 through the bottom of the engine body 12 and then led out to the rear side of the vehicle body.

  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 device 26 provided in the exhaust pipe 22 is disposed in front of the engine body 12, the power train 11 is positioned on the rear side of the vehicle so that the yaw inertia during the traveling of the vehicle is achieved. There is an advantage that the moment can be effectively reduced.

  That is, an exhaust system auxiliary machine 26 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 portion side of the vehicle body, it is possible to effectively reduce the yaw moment of inertia that acts when the vehicle travels, and to improve steering stability and travel stability.

  In addition, since the exhaust train auxiliary device 26 composed of a large catalyzer can be freely laid out in the engine room 2 in which a space is generated by positioning the power train 11 on the rear side of the vehicle, The downstream side catalyzer α (see FIGS. 6 and 7) disposed in the tunnel portion 6 of the passenger compartment floor or below the floor panel 4 can be reduced in size or omitted. Therefore, according to the reaction heat of the downstream catalyzer α without taking measures such as installing a heat insulating member in order to prevent the influence of the heat generated in the downstream catalyzer α from reaching the inside of the passenger compartment 1. There is an advantage that it is possible to effectively prevent the feet of the passenger from being heated.

  In addition, as in the conventional example, when the exhaust gas purification downstream catalyzer α is provided in the tunnel portion 6 of the passenger compartment floor, the passenger seat 7 provided in the passenger compartment 1 is provided. It is necessary to avoid interference with the downstream catalyzer α by positioning it to some extent upward. On the other hand, when the downstream side catalyzer α is omitted or downsized, as shown in FIG. 4, the passenger seat 7 can be positioned lower than the conventional one, and the vehicle There are advantages such as being able to reduce the height.

  And since the exhaust system auxiliary machine 26 which consists of a catalyzer etc. for exhaust gas purification as mentioned above was arranged in the position near the front end part of the oil pan 27 provided in the bottom part of the engine body 12, when starting the engine, By heating the oil pan 27 in accordance with the reaction heat of the exhaust system auxiliary machine 26, the temperature of the lubricating oil that is difficult to heat because it is contained in the oil pan 27 can be raised at an early stage. Therefore, by sufficiently exerting the lubricating function of each part of the engine by the lubricating oil when starting the engine, it is possible to effectively improve the warm-up performance of the engine while stabilizing the startability of the engine.

  In addition, when the vehicle travels after the warm-up, the traveling wind introduced into the engine room 2 from the opening of the front grill 9 is supplied to the installation portion of the exhaust system auxiliary device 26 so that the exhaust system auxiliary device 26 is used. Since it can be cooled, the exhaust system auxiliary 26 is excessively heated according to its reaction heat, so that it deteriorates quickly, or is heated to a temperature higher than the appropriate reaction temperature, and the exhaust gas purification performance is improved. It can prevent effectively that it falls. Further, the traveling wind that has passed through the installation portion of the exhaust system auxiliary device 26 is introduced into the tunnel portion 6 in the center of the passenger compartment along the bottom portion of the engine body 12, and is led out of the vehicle through the tunnel portion 6. Therefore, it is effective that the reaction heat generated in the exhaust system auxiliary device 26 adversely affects each device in the engine room 2 or the feet of the passenger seated on the passenger seat 7 in the passenger compartment are heated. There is an advantage that can be prevented.

  Further, the heat exchanger body 16 composed of a radiator or the like as described above and the cooling fan 17 for supplying cooling air to the heat exchanger body 16 are provided in the heat exchanger 18, and the cooling fan is provided at least after the engine is warmed up. 17 is operated to supply cooling air to the exhaust system auxiliary device 26 so as to cool it, so that even when the amount of traveling air introduced into the engine room 2 from the opening of the front grill 9 is small In addition, there is an advantage that the exhaust system auxiliary machine 26 can be effectively prevented from being rapidly deteriorated by being heated excessively according to the reaction heat.

  That is, in the first embodiment, the cooling fan 17 of the heat exchanger 18 and the cooling fan 17 of the exhaust system auxiliary machine 18 are arranged so as to overlap each other when viewed from the front, and the vehicle stops after the warm-up is completed. When the cooling fan control means 28 confirms that the cooling fan 17 has entered a low-speed running state, an operation command signal for operating the cooling fan 17 is output, and the front grill 9 is activated in accordance with the suction force. The cooling air is introduced into the engine room 2 through the opening of the engine, and the cooling air is supplied to the installation portion of the heat exchanger 18 to actively exchange heat of the engine cooling water. Since the exhaust system auxiliary machine 26 is cooled by being supplied to the installation section 26, even when the amount of travel air introduced into the engine room 2 from the opening of the front grill 9 is small, Can be air-based accessory 26 is effectively prevented such that thermal deterioration at an early stage.

  Instead of the first embodiment in which the cooling fan 17 and the exhaust system auxiliary machine 26 of the heat exchanger 18 are arranged so as to overlap each other in a front view, the cooling fan 17 and the exhaust system auxiliary machine 26 are replaced with each other. The angle of inclination of the cooling fan 17 is set so that the air blowing direction of the cooling fan 17 faces the installation part of the exhaust system auxiliary device 26 at least after the engine is warmed up. The exhaust system auxiliary machine 26 may be configured to be cooled by outputting an operation command signal for operating the cooling fan 17.

  FIG. 5 shows a second embodiment of the powertrain arrangement structure for a vehicle according to the present invention. In the second embodiment, the exhaust system auxiliary device 26 is disposed at a position close to a lower front surface of a main body portion of a rotary engine constituted by a cylinder block of the engine main body 12, specifically, a rotor housing and a side housing. It is set. Even in such a configuration, the exhaust system auxiliary device 26 including the above-described exhaust gas purifying catalyzer and the like is disposed on the front side of the engine body 12 so that the engine room 2 is vertically installed. The engine main body 12 and the transmission 13 which are heavy objects can be arranged on the rear side of the vehicle as much as possible without depending on the reaction heat of the exhaust system auxiliary device 26 at the start of the engine without impairing the effect. By heating the engine main body 12, there is an advantage that the warm-up performance of the engine can be effectively improved while stabilizing the startability of the engine.

  In the second embodiment, the exhaust fan 26 and the cooling fan 17 are arranged so as to overlap each other when viewed from the front, for example, so that the cooling fan 17 is in an operating state at least after the engine is warmed up. If the exhaust system auxiliary machine 26 is configured to be cooled according to the suction force, the exhaust system auxiliary machine 26 can be used even when the amount of travel air introduced into the engine room 2 from the opening of the front grill 9 is small. There is an advantage that it is possible to effectively cool and effectively prevent the thermal deterioration and the reduction of the purification performance.

  In addition to the exhaust gas purification catalyzer, the exhaust system auxiliary device 26 may be a thermal reactor that burns unburned components in the exhaust gas, an exhaust turbine for a turbocharger, or the like. However, the exhaust gas purification catalyzer is activated at an early stage by the reaction heat and becomes a high temperature state, and since it is relatively large in size, if it is disposed on the rear side of the engine body 12, It is difficult to dispose the engine main body 12 and the transmission 13 which are heavy objects disposed vertically in the rear side of the vehicle as much as possible, and for exhaust gas purification when starting the engine. It is difficult to effectively heat the engine body 12 by the catalyzer.

  Therefore, as shown in the first and second embodiments, by arranging the exhaust system auxiliary device 26 including the exhaust gas purifying catalyzer at a position close to the lower front of the engine body 12, the engine room The engine main body 12 and the transmission 13 which are heavy objects vertically arranged in the vehicle 2 can be disposed as far as possible on the rear side of the vehicle, and are used for purifying the exhaust gas when starting the engine. It is desirable that the engine body 12 can be effectively heated by the catalyzer.

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 the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. 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 side surface sectional drawing which shows the prior art example of the powertrain arrangement structure of the vehicle which concerns on this invention. It is CC sectional view taken on the line of FIG.

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 26 Exhaust system auxiliary machine 27 Oil pan

Claims (6)

  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 arranged vertically in an engine room and a transmission connected to the rear of the engine body, and a heat exchanger for cooling the engine is arranged in front of the engine body. An exhaust pipe extending from the engine main body to the front side of the vehicle body is disposed between the heat exchanger and the engine main body, and an exhaust system auxiliary device provided in the exhaust pipe is disposed below the front of the engine main body. A powertrain arrangement structure for a vehicle, characterized in that the engine main body is arranged at a position close to the engine so that the engine body can be warmed up by heat of an exhaust system auxiliary machine.   2. The vehicle powertrain arrangement structure according to claim 1, wherein the exhaust system auxiliary machine is arranged at a position close to a front end portion of an oil pan provided at the bottom of the engine body.   2. The vehicle powertrain arrangement structure according to claim 1, wherein the exhaust system auxiliary machine is arranged at a position close to a lower front surface of a cylinder block of the engine body.   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 at least after the engine is warmed up, the exhaust system auxiliary equipment can be cooled by the cooling fan. The powertrain arrangement structure for a vehicle according to any one of claims 1 to 3.   5. The vehicle powertrain arrangement structure according to claim 4, wherein the exhaust system auxiliary device and the cooling fan are arranged so as to overlap each other in a front view.   The vehicle powertrain arrangement structure according to any one of claims 1 to 5, wherein the exhaust system auxiliary device is a catalyst for exhaust gas purification.

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