JPH08164756A - Inlet system cooling device in transverse engine - Google Patents

Abstract

PURPOSE: To prevent the inflow of a hot blast produced out of a radiator and an exhaust system of a transverse engine into an inlet system from occurring as well as to efficiently cool the inlet system with the outside air from a fresh air inlet duct. CONSTITUTION: An engine 2 is horizontally placed in an engine room of a vehicle, and an exhaust system 3 of this engine is set up at a front side of the vehicle and also an inlet system 4 is set up in the rear side of the vehicle, and further a fresh air inlet duct 5 blowing the outside air taken in from the front side of the vehicle to the inlet system 4 for cooling is installed astride an engine upper part, it is composed by installing a preventing member 6, preventing a blast of hot air out of the car front from flowing into the inlet system 4 of the engine at the rear side of the vehicle in an interval between an underside of the fresh air inlet duct and an upper part of the engine 2. At this time, width of the duct 5 is made larger than that of the exhaust system 3, and further an area where the preventing member 6 is installed is made wider than the width of the exhaust system 3. In consequence, such a possibility that heat from a radiator 13 and the exhaust system 4 might heat up the inlet system 2 after transmitting a bottom part of the fresh air inlet duct 5 is utterly unfounded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for an intake system of a horizontally mounted engine, and more particularly to an intake system for a horizontally mounted engine in which the exhaust system is located in front of the vehicle. The present invention relates to an intake system cooling device for a horizontal engine, which has improved cooling efficiency of a device that cools using an introduction duct.

[0002]

2. Description of the Related Art In recent years, with the increasing output of automobile engines, it is necessary to supply a large amount of oxygen required for combustion to the combustion chamber of the engine. However, the intake air to the engine is warmed in the engine room before entering the combustion chamber, and the intake air temperature rises. When the temperature of the intake air introduced into the combustion chamber becomes high, the density of the air decreases, the weight of oxygen in the intake air decreases, and the charging efficiency decreases, which causes a decrease in engine output and the occurrence of knocking. .

In particular, knocking is a function of temperature, and the higher the temperature, the more severe the knocking. Therefore, if the temperature of the intake air supplied to the engine rises,
The temperature of the knocking occurrence portion is further increased, and knocking is more likely to occur. Therefore, it is necessary for a high-power engine to cool the intake air to the engine so that it does not reach a high temperature before entering the combustion chamber, to suppress a decrease in engine output, and to prevent knocking.

Therefore, as seen in Japanese Utility Model Laid-Open No. 2-109720, outside air is introduced into the engine room,
We propose that the outside air is blown into the intake air passage through the air duct part (outside air introduction duct) attached to the back of the engine hood to efficiently cool the intake air by the outside air to improve the power performance. Has been done.

[0005]

However, the device proposed in Japanese Utility Model Laid-Open No. 2-109720 is a horizontal engine in which an engine is mounted in the engine room laterally with respect to the longitudinal direction of the vehicle. In the case where the exhaust system of the engine is arranged on the front side of the car and the intake system is arranged on the rear side of the car, the hot air heated by the radiator or the exhaust system of the engine is guided by the outside air introduction duct, and the intake system of the engine is Therefore, there is a problem that the cooling effect of the intake system of the engine due to the introduction of the outside air cannot be sufficiently obtained.

This problem will be described with reference to FIG. FIG. 11A shows an engine hood 11 covering the engine room 1.
1 shows the front part of the automobile 10 in a state where the
The engine 2 is mounted sideways on the automobile 10.
The horizontally installed engine 2 is provided with an exhaust system 3 on the front side of the automobile 10 and an intake system 4 on the rear side. An outside air introduction duct 5 for guiding outside air on the front side of the vehicle to the intake system 4 is attached to the back surface side of the engine hood 11.

FIG. 11B shows a schematic cross section of the engine room 1 with the engine hood 11 of FIG. 11A closed. The outside air intake 5A of the outside air introduction duct 5 attached to the back surface of the engine hood 11 is
In the state where 1 is closed, it opens to the rear of the grill 12 of the automobile 10, and the outlet 5B for the outside air of the outside air introduction duct 5 faces the intake system 4 of the engine 2. In the figure, 13 is a radiator, 14 is an electric fan, and 15
Indicates a bumper.

In the engine room 1 provided with the outside air introducing duct 5 as described above, the outside air C shown by the broken line cools the intake system 4 of the engine 2 through the outside air introducing duct 5, but the radiator 13 and the engine 2 are also cooled. The hot air HA (shown by a thick line) heated by the exhaust system 3 is also guided to the periphery of the intake system 3 of the engine 2 by being guided by the outside air introduction duct 5, and the intake system 3 of the engine 2 by the introduction of the outside air. It was not possible to obtain a sufficient cooling effect.

Therefore, the present invention solves the above-mentioned problems in the conventional intake air cooling system for an engine, prevents hot air generated from a radiator or an exhaust system in a horizontal engine from flowing into an intake system, and uses an outside air introduction duct. An object of the present invention is to provide an intake system cooling device for a horizontal engine in which the intake system is efficiently cooled by the blown outside air.

[0010]

The present invention for achieving the above object includes an engine mounted laterally to the front-rear direction of a vehicle in an engine room of the vehicle, and an exhaust system of the engine is provided on the front side of the vehicle. The intake system is arranged on the rear side of the vehicle, and the intake system of a horizontal engine is provided with an outside air introduction duct that blows outside air taken in from the front side of the vehicle to the intake system to cool the intake system. In the cooling device, a blocking member that blocks hot air from the front of the vehicle from flowing into the intake system of the engine on the rear side of the vehicle is provided between the lower surface of the outside air introduction duct and the upper portion of the engine. .

At this time, the width of the outside air introducing duct is made larger than the width of the exhaust system of the engine, and the region where the blocking member is provided is provided in a region wider than the width of the exhaust system of the engine. It is desirable to set it.

[0012]

According to the intake system cooling system for a horizontal engine of the present invention, the horizontal engine is provided in the engine room of the vehicle, the exhaust system of the engine is on the front side of the vehicle, and the intake system is on the rear side of the vehicle. In a cooling system for an intake system of a horizontal engine in which an outside air introducing duct for blowing outside air to cool the intake system is arranged to straddle the upper part of the engine, a blocking member provided between a lower surface of the outside air introducing duct and an upper part of the engine. This prevents hot air from the front of the vehicle from flowing into the intake system of the engine on the rear side of the vehicle.

At this time, if the width of the outside air introducing duct is formed larger than the width of the exhaust system of the engine, and the region where the blocking member is provided is wider than the width of the exhaust system of the engine, The cooling efficiency of the intake system is further improved.

[0014]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which the same components as those in the prior art are designated by the same reference numerals. FIG. 1 (a) shows the front part of the automobile 10 with the engine hood 11 opened.
1B shows a schematic cross section of the engine room 1 with the engine hood 11 of FIG. 1A closed. The engine 2 is mounted sideways in the engine room 1. The horizontally installed engine 2 is provided with an exhaust system 3 on the front side of the automobile 10 and an intake system 4 on the rear side. An outside air introduction duct 5 for guiding outside air on the front side of the vehicle to the intake system 4 is attached to the back surface side of the engine hood 11.

Although the conventional outside air introducing duct 5 is provided along the back surface of the engine hood 11 so as to be in close contact with the engine hood 11 (see FIG. 11 (b)), the outside air introducing duct 5 of this embodiment is The outside air introduction duct 5 is attached to the back surface of the engine hood 11 so that the outside air outlet 5B side is separated from the back surface of the engine hood 11. This is because, as shown in FIG. 1B, when the engine hood 11 is closed, the outside air outlet 5B side of the outside air introduction duct 5 is brought close to the head cover 21 at the upper portion of the engine 2. The outside air intake port 5A of the outside air introduction duct 5 is connected to the grill 1 of the automobile 10 with the engine hood 11 closed.
The air outlet 5B of the outside air of the outside air introduction duct 5 faces the intake system 4 of the engine 2. In the figure, 13 is a radiator, 14 is an electric fan, 15 is a bumper, 16 is an under cover, 17 is a dash panel, and 22 is a transmission.

In the intake system cooling device configured as described above, in the first embodiment, the lower surface 5 of the outside air introducing duct 5 is used.
A seal member 6 that is a blocking member that blocks hot air is provided at a portion of C facing the head cover 21 of the engine 2. This sealing material 6 is, as shown in FIG. 1 (a),
It is provided in a direction along the head cover 21 of the horizontal engine 2. The height of this sealing material 6 is as shown in FIG.
As shown in, when the engine hood 11 is closed, the tip portion of the engine 2 comes into contact with the head cover 21 to seal the gap between the lower surface 5C of the outside air introduction duct 5 and the head cover 21. This sealing material 6 is
It may be formed of a flexible rigid resin or rubber having heat resistance.

As described above, the lower surface 5C of the outside air introducing duct 5
In the engine room 1 where the sealing material 6 is provided, the outside air C indicated by the broken line is discharged from the engine room 1 after cooling the intake system 4 of the engine 2 through the outside air introduction duct 5 as in the conventional case. . On the other hand, the hot air HA (8) indicated by the thick line heated by the radiator 13 and the exhaust system 3 of the engine 2 (8
(0 to 90 ° C.) and radiant heat of the exhaust system 3 are guided by the outside air introducing duct 5 and try to cross the head cover 21 of the engine 2, but the gap between the lower surface 5C of the outside air introducing duct 5 and the head cover 21 is sealed. Since it is sealed by the material 6, it cannot flow around the intake system 3, flows to the transmission 22 side, and is discharged from the engine room 1.

As a result, the intake system 4 of the engine 2 is no longer warmed by the hot air HA generated in the engine room 11, and the temperature of the intake air taken into the engine 2 drops. As a result, the volumetric efficiency of the intake air is increased and knocking is improved, so that the power performance of the vehicle is improved. Further, since the hot air HA does not flow in, the ambient temperature around the intake system 4 decreases, so the fuel temperature in the fuel supply system (not shown) to the engine 2 and the temperature of the fuel injection valve main body (not shown). Goes down. As a result, the vapor lock is prevented, the restartability of the engine 2 is improved, and the temperature of rubber products such as the rubber seal at the tip of the fuel injection valve and the fuel hose is lowered to improve its durability.

Further, as shown in FIG. 1 (b), since the outside air introduced into the engine room 11 by the outside air introduction duct 5 flows along the dash panel 17 after cooling the intake system 4 of the engine 2, The temperature of peripheral parts of the dash panel 17, such as the steering gear box, the brake booster, and the rubber hoses for these pipes, is lowered, and the durability is improved.

Furthermore, since the temperature of the dash panel 17 itself is also lowered, the engine room 11 in the passenger compartment of the automobile is
It is possible to reduce the amount of heat insulating material that blocks heat from the equipment. FIG. 2A is an explanatory diagram for explaining the relationship between the outside air introducing duct 5, the sealing member 6 as a blocking member, and the width of the exhaust system 3 of the engine 2 described in FIGS. 1A and 1B. If the width A of the outside air introduction duct 5 is made larger than the width B of the exhaust system (exhaust manifold) 3 of the engine 2, the hot air HA can be reliably blocked from the intake system 4. At this time, if the rotation direction of the electric fan 14 is set to the right rotation as indicated by the arrow, the hot air HA can easily escape to the transmission 22 side. Reference numeral 41 indicates a throttle.

The outside air intake port 5A of the outside air introduction duct 5
May be formed wider than the width of the main body of the outside air introduction duct 5 or the width of the outside air outlet 5B. Figure 2
(b) shows a modification of the first embodiment of the present invention described with reference to FIGS. 1 (a), (b) and 2 (a), and shows the same parts as in FIG. 1 (b). There is. Therefore, the same constituent members as those in FIG. 1B of FIG. 2B are designated by the same reference numerals and the description thereof will be omitted.

The embodiment shown in FIG. 2 (b) differs from the first embodiment in that the sealing material 6 on the lower surface 5C of the outside air introducing duct 5 is different.
The point is that the heat insulating material 7 is provided on the front side of the portion provided with. The heat insulating material 7 is formed from the portion of the lower surface 5C of the outside air introducing duct 5 facing the electric fan 14 to the sealing material 6
It is attached to the entire surface up to the attachment site. In this embodiment, the function of the heat insulating material 7 does not warm the outside air flowing through the outside air introduction duct 5 by the hot air HA generated in the engine room 11, so that the outside air blown out from the outlet 5B of the outside air introduction duct 5 is Since the temperature is low, the cooling efficiency of the intake system 4 of the engine 2 is further improved.

The intake system cooling device for a horizontal engine according to the modification of the first embodiment can also obtain the same effect as that of the first embodiment. 3 (a) and 3 (b) show the second embodiment of the present invention.
2 shows a configuration of an intake system cooling device for a horizontal engine according to the embodiment of FIG. FIG. 3 (a) shows the front part of the automobile 10 with the engine hood 11 opened, and FIG.
It shows the same part as. Similarly, FIG. 3 (b) is similar to FIG. 3 (a).
Engine room 1 with the engine hood 11 closed
1B is a schematic cross-sectional view of the same as that of FIG. 1B. The engine 2 of this embodiment is also used in the automobile 10.
An exhaust system 3 is provided on the front side and an intake system 4 is provided on the rear side. 3 (a) and 3 (b), 5 is an outside air introduction duct provided on the back surface of the engine hood 11, 5A is an outside air intake port, 5B is an outside air blowout port, 1
3 is a radiator, 14 is an electric fan, and 21 is a head cover.

The outside air introducing duct 5 of this embodiment is also
The outside air outlet 5B side is attached to the back surface of the engine hood 11 so as to be separated from the back surface of the engine hood 11, and the outside air intake port 5A is opened behind the grill 12 of the automobile 10 with the engine hood 11 closed. The air outlet 5B of the outside air of the outside air introduction duct 5 faces the intake system 4 of the engine 2.

In the intake system cooling device configured as described above, in the second embodiment, the lower surface 5 of the outside air introducing duct 5 is used.
A windbreak plate 8 that is a blocking member that blocks hot air is provided in front of a portion of C that faces the head cover 21 of the engine 2. As shown in FIG. 1 (a), the windbreak plate 8 is provided in a direction along the head cover 2 of the horizontally placed engine 2,
The vehicle 10 is provided so as to project forward from the front side of the vehicle 10. Further, as shown in FIG. 1 (b), the height of the windbreak plate 8 is such that when the engine hood 11 is closed, the tip of the windbreak plate 8 is lower than the tip of the head cover 21 of the engine 2. It is such a height. The windbreak plate 8 can be formed integrally with the outside air introducing duct 5 by using the same material as the outside air introducing duct 5, but can be attached to the outside air introducing duct 5 later.

As described above, the lower surface 5C of the outside air introducing duct 5
In the engine room 1 where the windbreak plate 8 is projectingly provided, the outside air C indicated by the broken line is discharged from the engine room 1 after cooling the intake system 4 of the engine 2 through the outside air introduction duct 5 as in the conventional case. It On the other hand, the radiator 13 and the engine 2
Hot air HA (80
˜90 ° C.) and the radiant heat of the exhaust system 3 are guided by the outside air introducing duct 5 and try to cross the head cover 21 of the engine 2, but the windshield 8 protruding from the lower surface 5C of the outside air introducing duct 5 Since it is guided and flows downward along the side surface of the engine 2, it cannot go around the intake system 3.

As a result, also in the second embodiment,
The intake system 4 of the engine 2 is no longer warmed by the hot air HA generated in the engine room 11, and the temperature of the intake air taken into the engine 2 is lowered, so that the volumetric efficiency of the intake air is improved and the knocking is improved. Power performance is improved. Further, as in the first embodiment, the temperature of the fuel supply system to the engine 2 (not shown) decreases,
The vapor lock is prevented, the restartability of the engine 2 is improved, the durability of rubber products such as fuel hoses is also improved,
This has the effects of lowering the temperature of the peripheral parts of the dash panel and improving the durability, and reducing the amount of heat insulating material used in the dash panel.

Although not shown, the outside air introducing duct 5
The heat insulating material 7 described with reference to FIG. 2 (b) may be provided on the front side of the lower surface 5C where the windbreak plate 8 is provided. If the heat insulating material 7 is provided, in this second embodiment as well, the function of the heat insulating material 7 prevents the hot air HA generated in the engine room 11 from warming the outside air flowing through the outside air introducing duct 5. The temperature of the outside air blown from the air outlet 5B is low, and the cooling efficiency of the intake system 4 of the engine 2 is further improved.

Further, in the second embodiment, it is not necessary to separate the blow-out port 5B side of the outside air introducing duct 5 from the back surface of the engine hood 11, and the conventional intake system cooling device explained in FIG. As described above, the outside air introduction duct 5 is provided along the back surface of the engine hood 11, and the lower surface 5C thereof is provided.
A windbreak plate 8 may be provided so as to protrude from the windshield. 4 (a)-(c) are shown in FIG.
FIG. 4 shows a modified example of the second embodiment of the present invention described in FIGS. 4 (a) and 4 (b), and FIGS.
4 (b) shows the same portion as FIG. 4 (b), and FIG. 4 (b) shows a partial schematic front view of the engine room 1 with the engine hood 11 of FIG. 4 (a) closed. Therefore, the same components as those in FIGS. 3 (a) and 3 (b) are designated by the same reference numerals and the description thereof will be omitted.

The modification shown in FIGS. 4 (a) to 4 (c) is different from that of the second embodiment in that the engine 2 has a portion of the lower surface 5C of the outside air introducing duct 5 where the windbreak plate 8 projects. An engine cover 9 that covers the front of the engine 2 is provided on the side surface of the outside air introduction duct 5 corresponding to the front. The engine cover 9 is provided so as to extend from the outside air introduction duct 5 so as to cover an extent exceeding the upper half of the front surface of the cylinder body 23 of the engine 2.

In this modification, the function of the engine cover 9 blocks the hot air flowing into the intake system 4 of the engine 2 through the gap between the front side of the engine 2 and the automatic body,
Since the hot air can escape to the transmission 22 side as shown by the thick line in FIG. 4 (b), the cooling efficiency of the intake system 4 of the engine 2 is further improved. FIG. 5 (a) shows the third embodiment of the present invention.
FIG. 5 (b) shows the front part of the automobile 10 with the engine hood 11 opened showing the configuration of the intake system cooling device for the horizontal engine of the embodiment of FIG. 5, and FIG. 5 (b) shows the engine hood 11 of FIG. 5 (a). Shows the engine room of the car with the closed position. In the third embodiment, the same components as those of the first and second embodiments described above are designated by the same reference numerals and the description thereof will be omitted.

In the third embodiment, the outside air introducing duct 5 is attached to the back surface of the engine hood 11 so that the outside air outlet 5B side is along the back surface of the engine hood 11,
The outside air intake port 5A opens rearward of the grill 12 of the automobile 10 with the engine hood 11 closed, and the outside air outlet port 5B of the outside air introduction duct 5 faces the intake system 4 of the engine 2. It has become. Further, as in the first embodiment, a sealing member 6 for preventing hot air, which is made of a heat resistant member, is provided at a portion of the lower surface 5C of the outside air introducing duct 5 facing the head cover 21 of the engine 2.

By the way, when the surge tank 40 of the intake system 4 has a circular cross section as in the first embodiment, the outside air C discharged from the outlet 5B of the outside air introducing duct 5 is the outer periphery of the surge tank 40. Since the air flows along the flow path, the cooling power of the fuel system by the outside air C is small. Therefore, in the third embodiment, the air outlet 5 of the outside air introduction duct 5 of the surge tank 40 of the intake system 4
The surface facing B is formed into a flat surface, and the inclination of this flat surface is toward the fuel delivery 23 and the fuel injection valve 24 as shown in FIG. 5 (b).

With this structure, after the outside air C discharged from the outside air outlet 5B hits the plane of the surge tank 40, about half of the outside air C continues to the surge tank 40.
2 and flows toward the fuel delivery 23 and the fuel injection valve 24. As a result, both the intake system 4 and the fuel system (the fuel delivery 23 and the fuel injection valve 24) are cooled by the outside air C discharged from the outside air outlet 5B. As a result, it is possible to achieve both a decrease in the temperature of the intake air taken into the engine 2 and a decrease in the temperature of the fuel system, and the restartability of the engine is improved.

The shape of the surface of the surge tank 40 of the intake system 4 that faces the outlet 5B of the outside air introduction duct 5 is shown in FIG.
If a mountain shape as shown in FIG. 5 (c) is used in addition to the plane as shown in FIG. 5 (b), half of the outside air C discharged from the outside air outlet 5B can be reliably distributed to the fuel system. By the way, in the third embodiment, the air outlet 5B of the outside air introducing duct 5 is
After hitting the entire surface of the surge tank 40, about half of the outside air C blown out from the surge tank 40 flows along the intake manifold 42 toward the fuel delivery 23 and the fuel injection valve 24. Since it flows between the branch pipes of the intake manifold 42, the cooling effect of the fuel system is weakened.

Therefore, in the fourth embodiment, FIG. 6 (a), and FIG. 6 (b) which is a sectional view taken along the line DD of FIG. 6 (a).
As shown in, the guide wall 43 is provided between the branch pipes of the intake manifold 42. The guide wall 43 is provided for a predetermined length from the surge tank 40 side of the intake manifold 42, and is not provided near the flange 44 of the exhaust manifold 42. Reference numeral 45 is a gasket inserted between the flange 44 and a cylinder block of the engine 2 (not shown).

FIG. 7 (a) is a partial schematic side sectional view of the engine room of the automobile 10 with the engine hood closed, showing the structure of the intake system cooling device for the transverse engine according to the fourth embodiment of the present invention. . This embodiment is the third embodiment described in FIG. 5 (b).
The intake manifold 42 of the above embodiment is replaced with the intake manifold 42 provided with the guide wall 43 described in FIGS. 6 (a) and 6 (b).

In the fourth embodiment, with this structure, after the outside air C emitted from the outside air outlet 5B hits the flat surface of the surge tank 40, about half of the outside air C continues to the surge tank 40 and the intake manifold 42 and the guide wall 43. Toward the fuel delivery 23 and the fuel injection valve 24. Then, after cooling the fuel delivery 23 and the fuel injection valve 24, the fuel is discharged from the space between the branch pipes of the intake manifold 42 without the guide wall 43. In the fourth embodiment, since the surface area of the intake manifold 42 is increased by the guide wall 43, the cooling effect is increased, and the outside air C discharged from the outside air outlet 5B is effectively cooled without wasting the outside air C and the fuel system. Therefore, the temperature of the intake air taken into the engine 2 and the temperature of the fuel system can be further promoted, and the restartability of the engine is further improved.

If the intake manifold 42 with the guide wall 43 shown in FIG. 5 (b) is used, the surge tank 4
The shape of the portion of the 0 facing the outside air outlet 5B does not have to be a flat surface, and as shown in FIG. 5 (c), the surge tank 40 may have a circular cross-sectional shape as in the conventional case. this is,
When the surge tank 40 has a circular cross section, even if the outside air C discharged from the blowout port 5B of the outside air introduction duct 5 flows along the outer circumference of the surge tank 40, the flow of the outside air C is then guided by the guide wall 43 to the fuel delivery 23. And because it is directed toward the fuel injection valve 24. Further, in this case, the center of the outlet 5B may be directed toward the center of the circular surge tank 40.

FIG. 8 (a) shows the front part of the automobile 10 with the engine hood 11 opened, showing the structure of the intake system cooling device for the transverse engine according to the fifth embodiment of the present invention. FIG. 8B shows the engine room of the automobile 10 with the engine hood 11 of FIG. 8A closed. Fifth
Also in this embodiment, the same components as those in the above-described first to fourth embodiments are designated by the same reference numerals, and the description thereof will be omitted.

Outside air introducing duct 5 in the fifth embodiment
Is attached to the back surface of the engine hood 11 such that the outside air outlet side is along the back surface of the engine hood 11. The outside air intake port 5A is opened to the rear of the grill 12 of the automobile 10 with the engine hood 11 closed. It is supposed to do. On the other hand, in the fifth embodiment, the air outlet side of the outside air is branched into the first air outlet 5B-1 and the second air outlet 5B-2. The first outlet 5B-1 faces the surge tank 40 and the second outlet 5B-1.
B-2 is a fuel delivery 23 and a fuel injection valve 24.
It is suitable for fuel systems consisting of.

Further, the lower end of the second outlet 5B-2 is
As shown in FIG. 5 (b), the engine hood 11 is closed to contact the cylinder head 21 of the engine 2 to prevent hot air HA from flowing to the intake system 4 or the fuel system side. There is. Therefore, in this fifth embodiment, it is not necessary to install the sealing material 6 for preventing hot air. Further, in the fifth embodiment, the passage cross-sectional area of the first outlet 5B-1 is formed larger than the passage cross-sectional area of the second outlet 5B-2, and the cooling cost of the surge tank 40 is reduced. Is becoming more common. This is to give priority to the decrease of the temperature of the intake air amount.

With this structure, the first outlet 5B for the outside air
The outside air C discharged from -1 cools the surge tank 40, and the outside air C discharged from the second outlet 5B-2 cools the fuel delivery 23 and the fuel system of the fuel injection valve 24. As a result, both the intake system 4 and the fuel system are cooled by the outside air C, the temperature of the intake air sucked into the engine 2 and the temperature of the fuel system can both be reduced, and the restartability of the engine is improved. .

FIG. 9 shows a modification of the above-mentioned fifth embodiment, in which the first outlet 5B-1 and the second outlet 5B are provided.
The shape of -2 is slightly different from that of the fifth embodiment. In this modification, the first outlet 5B-1 is extended to the intake system 4 side, and the outside air C blown out from the first outlet 5B-1 hits the surge tank 40 directly above. . In addition, a part of the flow of the outside air C smoothly flows into the branch portion of the second outlet 5B-2 from the outside air introduction duct 5.
The guide 50 is provided so as to face the blower outlet 5B-2 side. Similarly, the lower end portion of the second outlet 5B-2 comes into contact with the cylinder head 21 of the engine 2 with the engine hood 11 closed, and the hot air HA flows to the intake system 4 and the fuel system side. Are prevented.

FIG. 10 shows an engine hood 1 showing the structure of an intake system cooling device for a horizontal engine according to a sixth embodiment of the present invention.
1 shows a part of an engine room of an automobile 10 in a state where 1 is closed. Also in the sixth embodiment, the same components as those in the above-described first to fifth embodiments are designated by the same reference numerals and the description thereof will be omitted. In the outside air introducing duct 5 of the sixth embodiment, unlike the above-described embodiments, the outside air outlet 1B faces the fuel system including the fuel delivery 23 and the fuel injection valve 24. . Furthermore,
The lower end of the air outlet 5B comes into contact with the cylinder head 21 of the engine 2 with the engine hood 11 closed to prevent the hot air HA from flowing to the intake system 4 or the fuel system side. Therefore, in this fifth embodiment, it is not necessary to install the sealing material 6 for preventing hot air.

Furthermore, in the sixth embodiment, the guide walls 43 described in 6 (a) and (b) are provided in all regions between the branch pipes of the intake manifold 42. That is, in the sixth embodiment, the guide wall 43 is provided on all parts from the surge tank 40 side of the intake manifold 42 to the flange 44 of the exhaust manifold 42. With this configuration, the sixth
In the embodiment, the outside air C discharged from the outside air outlet 5B is first
It goes toward the full fuel delivery 23 and the fuel injection valve 24. Then, after cooling the high temperature fuel delivery 23 and the fuel injection valve 24, the fuel tank rises along the guide wall 43 and the branch pipe of the intake manifold 42, cools the intake manifold 42 from the high temperature side, and then cools the surge tank 40. In the sixth embodiment, since the intake system 4 and the fuel system are cooled from the high temperature side, it is possible to further promote the temperature decrease of the intake air sucked into the engine 2 and the temperature decrease of the fuel system. The restartability of is improved.

[0047]

As described above, according to the present invention, the engine is horizontally placed in the engine room, the exhaust system is provided on the front side of the vehicle, and the intake system is provided on the rear side of the vehicle. In the case where the intake system is cooled by the air intake system, the flow of hot air generated in the engine room to the intake system is blocked by the blocking member (sealing material, windbreak plate, engine cover). This has the effect of increasing the cooling effect and improving the power performance of the automobile.

Further, by the outside air from the outside air introducing duct,
The durability of the fuel system members is improved, and the amount of heat insulating material to be attached to the dash panel of an automobile can be reduced.

[Brief description of drawings]

FIG. 1 (a) is a perspective view of a front part of an automobile with an engine hood opened showing a configuration of an intake system cooling device for a horizontal engine according to a first embodiment of the present invention, and FIG. It is a schematic sectional side view of the engine room of the vehicle in the state where the engine hood of FIG.

2A is an explanatory view for explaining the relationship between the outside air introduction duct and the blocking member of FIG. 1, and the width of the exhaust system of the engine; FIG.
FIG. 4 shows a modified example of the first embodiment, and is a schematic side sectional view of the engine room of the automobile with the engine hood of FIG. 1 (a) closed.

FIG. 3 (a) is a perspective view of a front part of an automobile with an engine hood opened, showing a configuration of an intake system cooling device for a horizontal engine according to a second embodiment of the present invention; It is a partial schematic side sectional view of the engine room of the automobile in the state where the engine hood of a) is closed.

FIG. 4 (a) is a perspective view of a front part of an automobile with an engine hood opened, showing a configuration of an intake system cooling device for a horizontal engine according to a modified example of the second embodiment of the present invention; ) Is a partial schematic front view of the engine room of the automobile with the engine hood of (a) being closed, and (c) is a partial schematic side sectional view of the engine room of the automobile with the engine hood of (a) being closed. .

5 (a) is a perspective view of a front part of an automobile with an engine hood opened, showing a configuration of an intake system cooling device for a laterally mounted engine according to a third embodiment of the present invention, and FIG. FIG. 3A is a partial schematic side sectional view of an engine room of an automobile with the engine hood closed, and FIG. 3C is a partial sectional view of a surge tank portion showing another shape of the surge tank of FIG.

FIG. 6 (a) is a perspective view showing the configuration of an intake manifold and a surge tank used in the intake system cooling device for a horizontal engine according to the fourth embodiment of the present invention, and FIG. 6 (b) is a D- of FIG. It is sectional drawing in the D line.

FIG. 7 (a) is a partial schematic side sectional view of an engine room of an automobile with an engine hood closed, showing a configuration of an intake system cooling device for a horizontal engine according to a fourth embodiment of the present invention;
(b) is a partial schematic side sectional view of an engine room of an automobile with an engine hood closed, showing a configuration of an intake system cooling device for a horizontal engine according to a modification of the fourth embodiment of the present invention.

FIG. 8 (a) is a perspective view of a front part of an automobile with an engine hood opened, showing a configuration of an intake system cooling device for a horizontal engine according to a fifth embodiment of the present invention; It is a partial schematic side sectional view of the engine room of the automobile in the state where the engine hood of a) is closed.

FIG. 9 is a partially enlarged cross-sectional view showing another shape of the outside air introducing duct according to the fifth embodiment of the present invention.

FIG. 10 is a partial schematic side sectional view of an engine room of an automobile with an engine hood closed, showing a configuration of an intake system cooling device for a horizontal engine according to a sixth embodiment of the present invention.

FIG. 11 (a) is a perspective view of the front part of the automobile with the engine hood opened showing the structure of a conventional horizontal engine intake system cooling device, and FIG. 11 (b) is the engine hood shown in FIG. It is a partial schematic side sectional view of the engine room of the automobile in the closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine room 2 ... Engine 3 ... Exhaust system 4 ... Suction system 5 ... Outside air introduction duct 5A ... Outside air intake 5B, 5B-1, 5B-2 ... Outside air outlet 6 ... Blocking member (sealing material) 7 ... Insulating material 8 ... Windproof plate 9 ... Engine cover 10 ... Automobile 11 ... Engine hood 13 ... Radiator 14 ... Electric fan 15 ... Bumper 16 ... Undercover 17 ... Dash panel 21 ... Headcover 22 ... Transmission 23 ... Fuel delivery 24 ... Fuel injection valve 40 ... Surge tank 42 ... Intake manifold 43 ... Guide wall C ... Outside air HA ... Hot air

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[Procedure amendment]

[Submission date] June 15, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

The modification shown in FIGS. 4 (a) to 4 (c) is different from that of the second embodiment in that the engine 2 has a portion of the lower surface 5C of the outside air introducing duct 5 where the windbreak plate 8 projects. An engine cover 9 that covers the front of the engine 2 is provided on the side surface of the outside air introduction duct 5 corresponding to the front. The engine cover 9 is provided to be extended from the outside air introduction duct 5 so as to cover the extent of more than the upper half of the front surface of the cylinder body 2 8 of the engine 2.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F01P 5/06 511 J F02B 29/04 L F02M 35/10 311 C 35/16 E

Claims (2)

[Claims] 1. An engine mounted laterally to a front-rear direction of a vehicle in an engine room of the vehicle, wherein an exhaust system of the engine is arranged on a front side of the vehicle and an intake system is arranged on a rear side of the vehicle. In the intake system cooling device for a horizontal engine in which an outside air introduction duct that blows and cools the outside air taken in from the front side of the vehicle to the intake system is arranged across the upper part of the engine, the lower surface of the outside air introduction duct and the engine An intake system cooling device for a horizontal engine, wherein a blocking member for blocking the flow of hot air from the front of the vehicle into the intake system of the engine on the rear side of the vehicle is provided between the upper part of the vehicle and the upper part of the vehicle. 2. The width of the outside air introduction duct is formed to be larger than the width of the exhaust system of the engine, and the region where the blocking member is provided is provided in a region wider than the width of the exhaust system of the engine. The intake system cooling device for a horizontal engine according to claim 1, wherein: