JPH0725243U - Supercharged engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To effectively cool the turbocharger by effectively using the intercooler cooling air flow. [Structure] An engine body 21 of a supercharged engine 20 including at least turbochargers 35 and 36 and an air-cooling intercooler 50 is mounted in an engine room 3 of a vehicle body 1. The air-cooled intercooler 50 is attached to the bonnet 5
The turbo superchargers 35 and 36 are arranged below the intercooler 50 so as to be cooled by the traveling wind introduced from the air scoop 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a supercharged engine having an air-cooled intercooler for vehicles such as automobiles, and more particularly, to effective use of traveling air for cooling the intercooler.

[0002]

[Prior art]

 In a supercharged engine equipped with an air-cooled intercooler, the intercooler is placed at a predetermined position in the engine room of the vehicle body so that the compressed air from the turbocharger is cooled by the running wind. Will be mounted on the vehicle. On the other hand, in the engine room, one or two turbochargers, which are heat sources, are installed along with the engine body. These intercoolers, turbochargers, etc. are engine space limited. It cannot be placed at a sufficient thermal distance within the chamber. For this reason, it is desired to effectively utilize the above-mentioned running air for cooling the intercooler to accelerate the cooling of the heat source such as the turbocharger.

Conventionally, regarding a supercharged engine equipped with the above-mentioned air-cooled intercooler, there are precedent examples such as Japanese Utility Model Laid-Open No. 60-15928 and Japanese Utility Model Laid-Open No. 3-82833. In these prior art examples, the intercooler is arranged beside or in front of the engine body and in the front of the engine room in a layout relationship unrelated to the turbocharger, and the wind traveling from the front of the vehicle is guided by the air duct. It has been shown to lead to a cooler.

[0004]

[Problems to be solved by the device]

 By the way, in the case of the preceding example, the intercooler is cooled by the running wind from the front of the vehicle body, and the running wind that has passed through the intercooler is discharged as it is. The driving wind is not being used effectively. Moreover, since the turbocharger has a configuration in which it is naturally cooled by the running wind in the engine room, a sufficient cooling effect cannot be obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to effectively utilize traveling air for intercooler cooling to promote cooling of a turbocharger and the like.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an air-cooled intercooler for a supercharged engine in which an engine body having at least a turbocharger and an air-cooled intercooler is installed in an engine room of a vehicle body. It is characterized in that it is arranged so as to be cooled by the running wind introduced from the air scoop of the bonnet, and a turbocharger is arranged below this intercooler.

[0007]

[Action]

 According to the present invention having the above-described configuration, the traveling wind introduced from the air scoop of the hood of the vehicle body while the vehicle is traveling passes through the intercooler of the engine with a supercharger, and the compressed air by the turbocharger of the intercooler is effective. Is cooled. The running wind that has cooled the intercooler passes through the lower four directions.By installing a turbocharger below this intercooler, the running wind that passed through the intercooler further turbocharges it. Cooling of machines is also promoted.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, a configuration of a supercharged engine in which two turbochargers are attached to a horizontally opposed engine as a vehicle engine and a vehicle mounted state will be described. First, reference numeral 1 is a vehicle body, and the front of the vehicle body 1 is partitioned by a toe board 2 into an engine room 3 and a vehicle room 4. Then, the engine 20 with a supercharger and the power unit 10 including the clutch, the transmission, and the front differential device 11 are mounted in the engine room 3 in a vertically arranged manner, and are mounted so as to be installed from the front differential device 11 to the axle. It is configured to be transmitted to the front wheels 13 via the device 12.

The supercharged engine 20 has a horizontally opposed engine body 21. The engine body 21 has cylinder heads 23 and 24 connected horizontally to left and right banks L and R of a crankcase 22, It is thin and short. Therefore, by utilizing this engine body shape, intake manifolds 40, 41 of a plurality of cylinders are installed on the upper portion of the engine body 21 in a curved manner so that the ends communicate with the left and right cylinder heads 23, 24. A chamber 42 is connected between 40 and 41. Exhaust manifolds 25 and 26 are taken out under the left and right cylinder heads 23 and 24, respectively, and both exhaust manifolds 25 and 26 are connected by a communication pipe 27.

In this way, the exhaust systems are taken out separately for the left and right banks L and R, so that the primary positions are provided at the height positions where they do not interfere with the power unit 10 immediately after the left and right banks L and R, that is, directly above the engine body 21. A turbocharger 35 and a secondary turbocharger 36 are provided. Both of these turbochargers 35 and 36 are installed substantially horizontally in the vehicle front-rear direction with the blower side facing forward. Further, since the exhaust manifold 25 in the lower portion under the engine body 21 and the primary turbocharger 35 in the rear high location are connected, the exhaust manifold 25 is bent and formed at an acute angle, and the exhaust manifold 25 is inclined rearward and upward. The exhaust pipes 28 arranged in the same manner are connected to the turbine housing 35c of the primary turbocharger 35.

Similarly, in the right bank R, the exhaust manifold 26 is connected to the turbine housing 36c of the secondary turbocharger 36 via the exhaust pipe 29. In this way, the exhaust systems of the left and right banks L and R are communicated with each other by the communication pipe 27, and are also separately communicated with the primary turbo supercharger 35 and the secondary turbo supercharger 36 by a pipe line having a short pipe length. The exhaust sides of both turbochargers 35 and 36 are gathered in one exhaust pipe 30 and communicated with a catalytic converter 31 and a muffler 32, as shown in FIG.

The intake system will be described. First, it has an air-cooled intercooler 50. That is, since there is a relatively large space between the shortened engine body 21 and the toe board 2 in the engine room 3, the intercooler 50 is formed in a rectangular box shape having a large air cooling area. In addition, the intercooler 50 is a system that cools with running wind from the bonnet 5 side. Therefore, the intercooler 50 is located in the engine room 3 at a position higher than that between the turbochargers 35 and 36, that is, the bonnet 5 It is installed so that it slopes downwards along the hood 5 near the. An air scoop 6 is formed in the bonnet 5 so as to optimally introduce the traveling wind into the intercooler 50. On the other hand, the intercooler 50 is arranged at a high place in the vicinity of the hood 5, and both turbochargers 35 and 36 are arranged below the intercooler 50, so that the layout is made by the air scoop 6. Both turbochargers 35, 36 can be cooled by the running wind.

Next, the routing of the intake system will be described. An air cleaner 43 is arranged on the right bank R side, and this air cleaner 43 is connected to an intake pipe 45 via a duct 44. The intake pipe 45 is inserted under the intake manifold 41 on the right side and is connected to the front end of the blower housing 36d of the secondary turbocharger 36 with a short pipe length. Further, another intake pipe 46 branched from the middle of the intake pipe 45 is routed to the left side and connected to the front end of the blower housing 35d of the primary turbocharger 35. The suction pipes 47 and 48 are respectively extended from the side portions of the blower housings 35d and 36d of both turbochargers 35 and 36 to the rear side under the intercooler 50, and the ends thereof are connected to the intercooler 50. It is connected to the lower rear end. On the other hand, the approximately center of the front end of the intercooler 50 is linearly connected to the chamber 42 via a throttle body 52 having a throttle valve 51.

In this way, the intake system is temporarily routed from the front of the vehicle body to the rear via both turbochargers 35 and 36, and then from the rear thereof linearly via the intercooler 50 and the throttle body 52 to the front chamber 42, It is constructed by being drawn around the intake manifolds 40 and 41.

A control system of the engine 20 with a supercharger will be described with reference to FIG. First, the primary turbo supercharger 35 is provided with a waste gate valve 60. In addition to the wastegate valve 61, the secondary turbocharger 36 has an exhaust control valve 62 on the upstream side of the turbine, an intake control valve 63 on the downstream side of the blower, and a boost pressure to a relief passage 65 that bypasses the upstream and downstream of the blower. Relief valves 64 are provided respectively. Each of the valves 60 to 64 is configured to be opened and closed by the air pressure of the actuators 60a to 64a so as to switch and control the operating number of the two turbochargers 35 and 36 according to the driving and running states.

Next, measures for effectively using the running wind introduced into the engine room will be described. First, the alternator 70, the air conditioner compressor 71, and the power pump 72 are provided in the uppermost front row of the engine body 21 as a horizontal type by the shape of the engine body 21. It is exposed above and arranged in a horizontal row. The alternator 70, the compressor 71 and the power pump 72 are connected by the crankshaft 9 so as to operate via a pulley 73 and a belt 74.

Therefore, as an effective use of the traveling wind introduced from the front of the vehicle body and hitting the above-mentioned auxiliary equipment, the wind guide cover 75 is attached to the alternator 70, the compressor 71, and the power steering pump 72. The air guide cover 75 covers the left and right compressors 71 and the power steering pump 72, exposes only the central alternator 70, guides the surrounding traveling wind to the alternator side, and actively cools the alternator 70. It

Further, as an effective use of traveling air for cooling the intercooler, a baffle plate 55 is attached to the lower front portion of the intercooler 50 so as to extend downward. The baffle plate 55 is located between the front intake manifold 40 and the rear primary turbocharger 35 in the space below the intercooler 50 as shown in FIG. 1, and passes through the intercooler 50. It is arranged so as to effectively guide the traveling wind to the primary turbocharger 35.

Next, the operation of this embodiment will be described. First, when the engine 20 with the supercharger is operating, for example, in a low speed range where the engine speed is low, the exhaust control valve 62 and the intake control valve 63 are closed, and the supercharging pressure relief valve 64 is controlled to open. It Therefore, all of the exhaust gas from the left and right banks L and R of the engine body 21 flows into only the primary turbocharger 35 via the exhaust manifolds 25 and 26, the communication pipe 27, and the exhaust pipe 28, and is discharged into the primary turbocharger 35. Only supercharging works. Therefore, the blower of the blower housing 35d of the primary turbocharger 35 is rotated at high speed to suck and compress air through the air cleaner 43, the duct 44, and the intake pipe 46, and the compressed air is cooled by the intercooler 50. It has a high air density. The flow rate of the compressed air having a high air density is adjusted by the throttle body 52, divided into the left and right by the chamber 42, and supplied to the respective cylinders of the left and right cylinder heads 23, 24 via the intake manifolds 40, 41. In this way, supercharging is performed so as to obtain high charging efficiency, and as a result, output characteristics with low low speed torque are obtained.

Next, while the engine speed is increasing, in the high speed range, the exhaust control valve 62 and the intake control valve 63 are controlled to open and the boost pressure relief valve 64 is controlled to close. There, the exhaust gas of the left bank L flows into the primary turbocharger 35 through the exhaust manifold 25 and the exhaust pipe 28, and the exhaust gas of the right bank R flows through the exhaust manifold 26 and the exhaust pipe 29. The turbochargers 35 and 36 are switched to supercharge operation. Therefore, a large amount of air is sucked and compressed by the blower housings 35d and 36d of the turbochargers 35 and 36, and this air is combined and cooled by the intercooler 50, and a large amount of air having a high supercharging pressure is generated. It is continuously and uniformly obtained. Then, this large amount of air is similarly supplied to the left and right cylinder heads 23, 24 and supercharged so as to further increase the charging efficiency, whereby the engine output characteristic is further increased.

When the engine 20 with a supercharger is driven as described above and the vehicle travels, traveling wind is introduced from the front of the engine room 3, and as shown in FIG. 8 spread laterally from above and flow backward near the bonnet 5 above the engine body 21 as shown by the arrow. In this case, the compressor 71 and the power steering pump 72 in the uppermost front row of the engine body 21 are covered with the wind guide cover 75, so that the traveling wind B smoothly flows backward without hitting them and the temperature inside the chamber decreases. To be done. On the other hand, a part of the traveling wind B hits the central alternator 70 exposed on the wind guide cover 75, and the surrounding traveling wind B is also guided to the alternator 70 side, so that the alternator 70 positively and efficiently. To be cooled. Therefore, even when the temperature in the chamber is high, the temperature of the alternator 70 itself is low and the power generation efficiency is ensured to be high.

Further, the traveling wind A is also introduced into the engine room 3 from the air scoop 6 of the hood 5 of the vehicle body 1 as shown by the arrow and immediately touches the core of the intercooler 50. Here, the intercooler 50 is arranged immediately after the air scoop 6 and is inclined downward to the front, and since there are only two intake pipes 47 and 48 below the intercooler 50, the traveling wind A is the intercooler. It efficiently hits the entire wide cooling area of 50 and passes smoothly through downward. When only the primary turbocharger 35 operates and the vehicle travels at a relatively low speed, the amount of compressed air is small and the amount of the traveling wind A is small at the same time. When traveling, the amount of compressed air increases and the amount of traveling wind A increases at the same time. In either case, the traveling wind A smoothly flows through the intercooler 50, so that the compressed air is always cooled efficiently.

At this time, the two turbochargers 35 and 36 are separately arranged below the intercooler 50, and the traveling wind A flows in the direction from above to the turbocharger, so that the turbo charger The heat of the superchargers 35 and 36 is prevented from radiating to the intercooler 50, the throttle body 52 and the like. Further, the traveling wind A that has cooled and passed through the intercooler 50 flows in the lower four directions, so that the two turbochargers 35 and 36 and the power unit 10 arranged below the intercooler 50 also have the traveling wind A. Cooling is promoted at the time. Here, a part of the traveling wind A that has passed through the intercooler 50 is guided to the primary turbocharger 35 side while being prevented from leaking forward by the wind guide plate 55, and therefore the primary turbocharger that always operates. Machine 35 is effectively cooled.

Although the embodiment of the present invention has been described above, it is needless to say that the present invention can be applied to engines with a supercharger other than the horizontally opposed type.

[0025]

[Effect of device]

 As described above, according to the present invention, in an engine with a supercharger in which an engine body having at least a turbocharger and an air-cooled intercooler is installed in an engine room of a vehicle body, an air-cooled intercooler is used. Is arranged so as to be cooled by the traveling wind introduced from the air scoop of the bonnet, and a turbocharger is arranged below this intercooler. The feeder etc. can be cooled effectively. As a result, the temperature inside the chamber becomes low, the durability of the turbocharger etc. is improved due to the temperature decrease, the amount of heat transfer to the surrounding parts is reduced, and the heat shield member is also unnecessary. The layout is simple because the intercooler and turbocharger are laid out vertically in the engine room.

[Brief description of drawings]

FIG. 1 is a side view showing an on-vehicle state of an engine with a supercharger according to the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a configuration diagram showing a control system of an engine with a supercharger.

[Explanation of symbols]

 1 vehicle body 3 engine room 5 bonnet 6 air scoop 20 engine with supercharger 21 engine body 35,36 turbocharger 50 intercooler

Claims (1)

[Scope of utility model registration request] 1. An air-cooled intercooler is introduced from an air scoop of a bonnet in an engine with a supercharger in which an engine body having at least a turbocharger and an air-cooled intercooler is mounted in an engine room of a vehicle body. An engine with a supercharger, which is arranged so as to be cooled by traveling wind, and a turbocharger is arranged below this intercooler.