JPH09310618A - Structure of outside air introducing air duct in vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate problems of heat resistance of an engine and attached parts in a vehicle in which an engine cover is arranged over an upper part of an engine body with a clearance by positively introducing forcible air flow into the clerance between the engine cover and the engine body, and promoting cooling inside the engine cover. SOLUTION: An extra part 5 is integrated with an outside air introducing air duct 4. The extra part 5 is shaped so as to correspond to an upper portion of a radiator fan shroud 3, have a plate-like form inclining upward and approaching a leading end of an engine cover 2 over an opening of an engine body side. An air guide part is provided so that forcible air flow by the radiator fan which is conducted upward from the opening of the radiator fan shroud 3 on its engine body side is guided to a clearance between the engine body and a front part of an engine cover 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air duct for introducing outside air, which is provided above a radiator fan shroud in a front part of a vehicle and introduces outside air into an engine room.
In particular, it relates to a technique for improving the cooling performance of an engine or the like.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique of providing an outside air introducing air duct for introducing outside air into an engine room in a front portion of a vehicle such as an automobile and cooling the engine by the outside air introduced by the duct (Japanese Patent Laid-Open No. Hei 10-1999) No. 4-60114).

[0003]

However, in such a conventional engine cooling structure using the air duct for introducing the outside air, the engine is cooled by using the running wind of the vehicle, and the air is cooled by the radiator fan or the like. Since the engine is not cooled by using the forced flow, the engine cooling effect cannot be obtained unless the vehicle is traveling, and it is disadvantageous in heat resistance of the engine when the engine is idled for a long time.

In particular, in a vehicle equipped with an in-line multi-cylinder engine in the front (FF vehicle) or a vehicle equipped with a V-type multi-cylinder engine in the front (FR vehicle), for the purpose of improving the appearance of the engine and obtaining a sound insulation effect, If an engine cover made of a heat-resistant resin such as nylon (some of which has a sound insulating material and a sound absorbing material provided on the inner surface) is provided to cover the upper part of the engine body with a gap, one of the functions of the engine cover is In order to enhance the sound insulation effect mentioned above, it is necessary to set the gap between the engine cover and the engine body as small as possible, and heat is likely to be trapped in the space between the engine cover and the engine body. In this case, the outside air cannot be positively introduced into the gap between the engine cover and the engine body, the temperature inside the engine cover rises, and Cooling is not expected.

Further, heat generating parts such as an alternator and thermally weak parts such as a harness are attached to the engine body, and it is not possible to expect effective cooling of these parts. It cannot be expected to improve reliability. Therefore, in view of the above-mentioned conventional circumstances, the present invention improves the structure of the air duct for introducing outside air into the engine room in a vehicle provided with an engine cover that covers the upper part of the engine body with a gap. By positively introducing a forced air flow into the gap between the engine cover and the engine body, promoting cooling inside the engine cover and solving problems such as heat resistance of the engine and its attached parts. Is an issue.

[0006]

Therefore, the invention according to claim 1 provides an engine cover for covering the upper part of the engine body with a gap in the engine room, and a radiator arranged in front of the engine body. In a vehicle provided with an outside air introducing air duct for introducing outside air into the engine room above the fan shroud, the outside air introducing air duct is integrally formed with a pad portion, and the pad portion is
The shroud is formed into a substantially plate-like shape from a position along the upper part of the radiator fan shroud to a position close to the engine cover front end beyond the engine main body side opening of the shroud, and the engine main body side opening of the shroud. The air guide portion guides a forced flow of air from the radiator fan, which is led out from the engine and is directed upward, toward the front clearance between the engine body and the engine cover.

Here, in the engine provided with an engine cover for covering the upper part of the engine body with a gap, it is necessary to set the gap between the engine cover and the engine body as small as possible. It is difficult for air to enter the upper part of the engine body through the gap between the parts. According to the first aspect of the present invention, since the outside air introducing air duct is provided with the pad portion that functions as an air guide portion, the radiator fan is forced out of the shroud through the opening on the engine body side and is forced upward by the radiator fan. The flow collides with the lower surface of the padless portion to change its direction and flows toward the front clearance between the engine body and the engine cover, so that the forced flow positively flows from the clearance to the upper part of the engine body. It will be.

According to a second aspect of the present invention, the pad portion is formed in a hollow shape, and an air inlet is provided in a lower wall of the pad portion that is located beyond the opening of the radiator fan shroud on the engine body side. The air outlets are provided in the end walls of the padded portion facing the engine cover. In the configuration of the invention according to claim 2, a part of the forced flow of the air by the radiator fan that is led out from the opening of the shroud on the engine body side and goes upward is collided with the lower surface of the pad portion and the direction thereof is changed. , While flowing toward the gap between the front part of the engine body and the engine cover, the other part flows into the hollow part of the pad part from the air inlet of the lower surface of the pad part, and from the inside of the hollow part. It reaches the outlet of the air and is discharged from here toward the front clearance between the engine body and the engine cover.

In the invention according to claim 3, a nozzle portion is provided at the air outlet. Thereby, the air can be more intensively discharged. According to a fourth aspect of the present invention, there is provided a radiator fan, which is led out from the engine body side opening of the shroud and is directed to the vehicle side, on the lower wall of the paddle portion at a position beyond the engine body side opening of the radiator fan shroud. A rectifying plate portion for rectifying the forced air flow toward the front clearance between the engine body and the engine cover is provided so as to project downward.

By providing such a rectifying plate portion on the lower wall of the shroud at a position beyond the opening on the engine body side of the shroud, air drawn out from the opening on the engine body side of the shroud and escaping to the side of the vehicle. The forced flow can be changed to the front clearance between the engine body and the engine cover. The invention according to claim 5 is provided above the radiator fan shroud arranged in front of the engine body, and the pad portion is provided in the outside air introducing air duct for introducing the outside air into the engine room. A forced flow of air by a radiator fan, which is led out from the opening of the shroud on the engine body side and is directed upward, is directed toward the engine body whose upper portion is covered with an engine cover.

In such a structure, the forced flow of air from the radiator fan, which is led out from the opening of the shroud on the engine body side and is directed upward, is directed toward the engine body covered by the engine cover, and the forced flow is positive. It will flow to the top of the body.

[0012]

According to the first and fifth aspects of the present invention, the forced flow of air by the radiator fan positively flows to the upper portion of the engine body, so that heat is less likely to be trapped in the gap between the engine cover and the engine body. Since the temperature inside the engine cover can be lowered, it is possible to effectively cool the engine body, which is advantageous in terms of heat resistance of the engine, as well as heat-generating parts and heat-weak parts attached to the engine body. The problem of heat resistance such as the above can be solved, the reliability of the operation of these parts and the like can be improved, and the intake manifold attached to the engine body can be cooled, so that the air flowing into the engine can be cooled. Since it is possible to improve the intake efficiency, it is possible to improve the engine output especially in the high speed range. Further, since the engine is cooled by using the forced flow of air by the radiator fan, the cooling effect of the engine can be obtained even when the vehicle is not traveling, for example, when the engine is idling for a long time.

According to the second aspect of the present invention, the forced flow of air by the radiator fan is not diffused but concentratedly flows toward the front clearance between the engine body and the engine cover. The cooling effect of the engine etc. can be further enhanced. According to the invention according to claim 3,
As a result of more concentrated discharge of air, the cooling performance can be further improved.

According to the invention of claim 4, it is possible to further enhance the cooling effect of the engine and the like.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 to 3, an engine cover 2 made of heat-resistant resin such as nylon is provided to cover the upper portion of the engine body 1A for the purpose of improving the appearance of the V-type multi-cylinder engine 1 and obtaining a sound insulation effect.

In this case, a gap is formed between the engine cover 2 and the engine body 1A in order to enhance the above-described sound insulation effect as one of the functions of the engine cover 2. On the other hand, an outside air introduction air duct 4 for introducing outside air into the engine room is provided above a radiator fan shroud (hereinafter, simply referred to as a shroud) 3 arranged in front of the engine body 1A.

The outside air introducing port 4A of the outside air introducing air duct 4 is opened toward the front of the vehicle at a position beyond the front part of the shroud 3, and the outside air introducing port 4B is provided at the outside of the shroud 3.
Is opened to the side of the vehicle at a position beyond the left side of the vehicle. The outside air introducing air duct 4 is formed in a hollow shape by blow molding. Here, a pad portion 5 is integrally formed with the outside air introducing air duct 4.

This pad 5 is also formed in the hollow,
A wall 4C separates from the original duct portion.
The pad portion 5 extends slightly upward in a substantially plate shape from a position along the upper part of the shroud 3 to a position near the tip of the engine cover 2 beyond the opening 3A on the engine body 1A side of the shroud 3. It is formed in an inclined and extended shape.

The positions of both side ends of the pad portion 5 corresponding to the lateral direction of the vehicle are set at positions substantially corresponding to the positions of both ends of the engine cover 2 in the same direction, and the width corresponding to the lateral direction of the vehicle is set to the engine. It is formed to have substantially the same width as the cover 2 in the same direction. The pad portion 5 having the above-described shape allows the forced flow of air by the radiator fan, which is led out from the opening 3A on the engine body 1A side of the shroud 3 and is directed upward, in front of the engine body 1A and the engine cover 2. It functions as an air guide portion that guides toward the gap portion 6 of the portion.

Next, the operation of this structure will be described. In the case where the engine cover 2 that covers the upper part of the engine body 1A with a gap is provided, it is necessary to set the gap between the engine cover 2 and the engine body 1A as small as possible. It is difficult for air to enter the upper portion of the engine body 1A from the gap portion 6 of the portion.

As described above, the air duct 4 for introducing outside air
Since the pad portion 5 that functions as an air guide portion is provided in the engine, the forced air flow 7 of the radiator fan, which is led out from the opening 3A of the shroud 3 on the engine body 1A side and is directed upward, is Since it collides with the lower surface and is changed in direction and flows toward the front clearance portion 6 between the engine body 1A and the engine cover 2, the forced flow from the clearance portion 6 positively flows to the upper portion of the engine body 1A. Become.

Incidentally, if the padless portion 5 is not provided, the forced air flow 7 of the radiator fan, which is led out from the opening 3A on the engine body 1A side of the shroud 3 and goes upward, remains on the upper surface side of the engine cover 2 as it is. It escapes and does not flow toward the front clearance between the engine body 1A and the engine cover 2. As described above, the forced flow 7 of air by the radiator fan positively flows to the upper part of the engine body 1A, so that it becomes difficult for heat to be trapped in the gap between the engine cover 2 and the engine body 1A, and the temperature inside the engine cover 2 decreases. Therefore, the engine body 1A can be effectively cooled, which is advantageous in heat resistance of the engine 1.

Further, the engine body 1A is provided with a heat-generating component such as an alternator and a thermally weak component such as a harness, and these components can be effectively cooled. Therefore, the reliability of the operation of these parts can be improved. Further, with the above configuration, since the intake manifold attached to the engine body 1A can be cooled, the air flowing into the engine 1 can be cooled, and the intake efficiency can be improved. It is possible to improve.

In particular, the intake manifold made of aluminum or resin is poor in heat conductivity and therefore poor in cooling performance.
The above cooling effect is more effective. Furthermore, by using the forced air flow 7 by the radiator fan, the engine body 1A
The cooling effect of the engine can be obtained without running the vehicle, for example, even when the engine is idling for a long time.

Next, another embodiment of the present invention will be described with reference to FIGS. 4, 5, 6 and 7. In the embodiment of FIGS. 4 and 5, when the pad part 5 is formed hollow as in the embodiment of FIGS. 1 to 3, the shroud 3 of the pad part 5 is opened on the engine body 1A side. An air inlet 8 is opened in the lower wall beyond the portion 3A,
The air outlet 9 is formed in the end wall of the engine cover 2 facing the engine cover 2.

In this structure, a part of the forced air flow 7 of the radiator fan, which is led out from the opening 3A on the engine body 1A side of the shroud 3 and goes upward,
While colliding with the lower surface of the flesh portion 5 to change the direction and flow toward the front clearance portion 6 between the engine body 1A and the engine cover 2, the other portion introduces air from the lower surface of the flesh portion 5. The air flows from the mouth 8 into the hollow portion of the pad part 5, reaches the air outlet 9 from the hollow portion, and is discharged from there toward the engine cover 2.

Therefore, the forced flow of air by the radiator fan is not diffused, but concentrated on the engine body 1A.
And the engine cover 2 flow toward the front clearance portion 6 and the cooling effect of the engine body 1 and the like can be further enhanced. As shown in the figure, the air outlet 9
The nozzle portion 10 may be provided in the nozzle, so that the air can be discharged more intensively.

The nozzle portion 10 may be formed integrally with the air duct 4 for introducing outside air, or a separate member may be attached to the air outlet 9 of the pad portion 5 to provide it. 6 and 7
In the embodiment, the opening 3 is formed in the lower wall of the shroud 3 of the padding 5 at a position beyond the opening 3A on the engine body 1A side.
A straightening vane portion 11 is provided so as to project downward so as to direct a forced flow of air by a radiator fan derived from A toward the vehicle side toward a front clearance portion 6 between the engine body 1A and the engine cover 2. I am trying.

In this case, the current plate portion 11 is formed in a curved shape as shown in FIG. 7, and the curved surface faces inward, for example, the corner portion on the right side of the vehicle of the small pad portion 5. Two are provided in parallel on the lower wall in the vicinity. By providing such a rectifying plate portion 11 on the lower wall of the shroud 3 at a position beyond the opening 3A on the engine body 1A side of the shroud 3, the shroud 3 is led out from the opening 3A on the engine body 1A side. Forced flow of air escaping to the side of the vehicle
It is possible to change the direction to the front clearance portion 6 between the engine cover 2 and the engine cover 2 so that the engine body 1A and the like can be more effectively cooled.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view of the above.

FIG. 3 is a side sectional view of the above.

FIG. 4 is a side sectional view of another embodiment.

FIG. 5 is a side sectional view of still another embodiment.

FIG. 6 is a plan view of still another embodiment.

FIG. 7 is a perspective view of a current plate portion in the embodiment of FIG.

[Explanation of symbols]

 1 Engine 1A Engine Main Body 2 Engine Cover 3 Radiator Fan Shroud 4 Outside Air Introducing Air Duct 5 Paddle Part 6 Gap 8 Air Inlet 9 Air Out 10 Nozzle 11 Rectifying Plate

Claims (5)

[Claims] 1. An outside air for introducing outside air into the engine room above the radiator fan shroud arranged in front of the engine body while providing an engine cover for covering an upper part of the engine body with a gap in the engine room. In a vehicle provided with an introduction air duct, a pad portion is integrally formed with the outside air introduction air duct, and the pad portion extends from a position along the upper part of the radiator fan shroud to an engine body side opening of the shroud. The radiator fan is formed in a shape that extends in a substantially plate shape to a position close to the engine cover tip, and a forced flow of air by a radiator fan that is led out from an opening on the engine body side of the shroud and goes upward is applied to the engine body and the engine. It is characterized in that it is an air guide portion that guides it toward the front clearance portion with the cover. Structure of the external air inlet for air duct in both. 2. The pad portion is formed in a hollow shape, an air inlet is provided in a lower wall of the pad portion at a position beyond the opening of the radiator fan shroud on the engine body side, and the pad portion is 2. The structure of an air duct for introducing outside air in a vehicle according to claim 1, wherein air outlet ports are provided respectively on end walls facing the engine cover. 3. The structure of an air duct for introducing outside air in a vehicle according to claim 2, wherein a nozzle portion is provided at the air outlet. 4. A forced air by a radiator fan drawn out from the engine body side opening of the shroud and directed toward the vehicle side on a lower wall of the paddle portion at a position beyond the engine body side opening of the radiator fan shroud. 4. A rectifying plate portion for rectifying the flow to direct the flow toward a front clearance portion between the engine body and the engine cover is provided so as to protrude downward and provided. The structure of the air duct for introducing outside air in the vehicle according to [1]. 5. A pad portion is provided on an outside air introducing air duct for introducing outside air into the engine room, the pad portion being provided above a radiator fan shroud arranged in front of the engine body, and the pad portion of the shroud. A structure of an air duct for introducing outside air in a vehicle, characterized in that a forced flow of air by a radiator fan that is led out from an opening on an engine body side and goes upward is directed toward an engine body with an engine cover covering an upper portion.