JP6683391B2 - Engine bunch cooling structure - Google Patents

Description

  The present invention relates to an engine compartment cooling structure, and more particularly to an engine compartment cooling structure for cooling an engine compartment covered with a floor member on the lower side with an airflow.

  In recent years, a floor member such as an undercover is arranged so as to cover a lower portion of an automobile in order to suppress resistance of an air flow flowing under the floor of the automobile. While this floor member reduces air resistance, the engine bunch where the drive parts such as the engine are arranged is covered from below, so it is difficult for the air in the engine bunch to circulate, and the drive parts that become high in temperature are cooled. Was difficult. Therefore, it is required to smoothly guide the airflow from the lower side of the floor member into the engine chamber while suppressing the resistance of the airflow flowing under the floor member.

  As a technique for smoothly guiding the air flow from the lower side to the upper side of the floor member, for example, in Patent Document 1, a vehicle body side attachment point of a traveling wheel and a suspension arm is provided in a flat portion in front of the traveling wheel of the undercover. An underfloor structure for an automobile has been proposed in which an air introduction portion is provided in a front extension region between the front and the rear of the vehicle and at a portion where the underfloor flow of air from the front of the vehicle redeposits. In the underfloor structure of this automobile, the air introduced at the redeposited part of the undercover catches the air that has come off the front end of the vehicle, so that the airflow flowing under the undercover is smoothly guided to the upper side of the undercover. can do.

Japanese Patent No. 2803473

  However, even if the underfloor structure of Patent Document 1 is applied to induce the airflow flowing under the undercover into the engine chamber, the airflow is introduced to the front side of the drive unit arranged in the engine chamber. It In this way, when the air flow is introduced to the front side of the drive unit, the air flow is warmed by the drive unit while moving rearward in the engine chamber, so that the electrical components and resin parts arranged on the rear side of the drive unit can be heated. It was difficult to cool the rear parts. Further, in the underfloor structure of Patent Document 1, the reattachment portion of the air where the air introduction portion is formed does not have a high pressure for introducing the air flow into the engine chamber where the air circulation is low. It is difficult to smoothly introduce the airflow from the lower side into the engine chamber through the air introduction portion.

  The present invention has been made in order to solve such a conventional problem, and a rear part disposed on the rear side of the drive unit by smoothly introducing an air flow from the lower side of the floor member into the engine chamber. An object of the present invention is to provide an engine-bundle cooling structure that reliably cools the engine.

An engine compartment cooling structure according to the present invention is an engine compartment cooling structure for cooling an engine compartment in which an underside of a vehicle is covered with a floor member and a drive unit including an engine is arranged therein by an airflow, The underfloor protrusion protruding downward, and the inlet opening downward from the floor member in the vicinity of the front portion of the underfloor protrusion and the discharge opening opened into the engine chamber on the rear side of the drive unit, An air flow guide portion provided with a guide wall in the engine chamber from the inlet to the outlet so as to guide the airflow flowing through the lower side from the inlet to the outlet, and the guide wall is a front tire. It is provided integrally with the mudguard attached to the lower edge of the tire house .

  Further, it is preferable that the discharge port is arranged on the rear side of the oil pan arranged on the lower side of the engine in the drive unit.

Further, the underfloor protrusion can be a pair of front tires arranged adjacent to both sides of the engine tuft.
The underfloor protrusion may be a tire flap attached to the front side of a pair of front tires arranged adjacent to both sides of the engine cluster.

  According to the present invention, an inlet opening downward from the floor member is provided in the vicinity of the front portion of the underfloor protrusion, and an outlet opening into the engine chamber is provided on the rear side of the drive unit. Since the airflow guide is provided with a guide wall from the inlet to the outlet so as to guide the flowing airflow from the inlet to the outlet, the airflow from the lower side of the floor member into the engine chamber is reduced. It is possible to provide an engine-bundle cooling structure that is smoothly introduced to reliably cool the rear part disposed on the rear side of the drive part.

It is a figure which shows the structure of the motor vehicle provided with the engine compartment cooling structure which concerns on Embodiment 1 of this invention. It is a bottom view showing signs that an airflow is introduced into the airflow guide from the lower side of the floor member. It is a figure which shows the structure of the motor vehicle provided with the engine compartment cooling structure which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the motor vehicle provided with the engine tuft cooling structure which concerns on Embodiment 3 of this invention. It is a figure which shows the structure of the motor vehicle provided with the engine compartment cooling structure which concerns on Embodiment 4 of this invention. It is a figure which shows the structure of the motor vehicle provided with the engine tuft cooling structure which concerns on Embodiment 5 of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1
FIG. 1 shows the configuration of an automobile having an engine-bundle cooling structure according to Embodiment 1 of the present invention. This automobile includes a windshield 1, a front hood 2 which is arranged so as to project in front of the windshield 1, a floor member 3 which is arranged below the front hood 2 so as to be spaced apart from each other, a front hood 2, and a front hood 2. A pair of fenders 4 extending in the front-rear direction along both side portions of the floor member 3, a front hood 2, a front wall portion 5 arranged so as to cover the front portions of the floor member 3 and the fender 4, a front hood 2, a floor. The member 3 and the toe board 6 arranged so as to cover the rear part of the fender 4. A tire house 7 is formed in the middle of the fender 4 so as to be recessed inward in the vehicle width direction, and a front tire 8 is arranged inside the tire house 7.

  The front hood 2, the floor member 3, the fender 4, the front wall portion 5 and the toe board 6 are arranged so as to surround the inside, and a substantially closed engine chamber R is formed inside the inside. In the engine compartment R, a drive unit 9 such as an engine is arranged between a pair of front tires 8 and an air flow guide unit 11 is provided so as to extend in the front-rear direction near the tire house 7. A passenger compartment C is formed on the rear side of the toe board 6 and the windshield 1.

The pair of front tires 8 are arranged in the tire house 7 adjacent to both sides of the engine compartment R, and the lower half portions thereof project below the floor member 3.
The floor member 3 is composed of a plate-shaped under cover that covers the entire lower portion of the engine tuft R.
The airflow guide 11 has an inlet 12 that opens downward from the floor member 3 in the vicinity of the front portion E of the front tire 8 and an outlet 13 that opens into the engine chamber R on the rear side of the drive unit 9. A guide wall 14 is provided from the inlet 12 toward the outlet 13 so as to guide the air flow F flowing under the floor member 3 from the inlet 12 to the outlet 13. The guide wall 14 has a tubular shape extending from the introduction port 12 to the discharge port 13, and a guide path P for guiding the air flow F is formed therein. In addition, the guide wall 14 is arranged so as to pass below the drive unit 9 along the floor member 3. The guide wall 14 is preferably made of a material having a lower thermal conductivity than that of the drive unit 9, and can be made of, for example, a resin material.

The drive unit 9 is for driving an automobile and is arranged in the engine compartment R so as to extend in the vehicle width direction. The drive unit 9 is configured to have a high temperature due to combustion of fuel or the like. Examples of the drive unit 9 include an engine, an oil pan that is arranged below the engine to accommodate the discharged oil, and an exhaust unit that guides exhaust gas generated in the engine to the outside.
The engine compartment cooling structure in the present invention is composed of the front tire 8 and the airflow guide portion 11.

Next, the operation of the first embodiment will be described.
First, as shown in FIG. 1, when a vehicle travels forward, an airflow F corresponding to the traveling speed of the vehicle is generated from the front toward the rear relative to the vehicle. Here, the floor member 3 of the automobile is formed to have a substantially flat shape, that is, to suppress abrupt irregularities (for example, irregularities of about 50 mm or more) and gently curve. Therefore, the airflow F can smoothly flow under the floor member 3, and the resistance of the airflow F flowing under the floor member 3 can be suppressed.

  Thus, while the unevenness is suppressed in the floor member 3, the front tires 8 are provided on both sides of the automobile, and the lower half portion of the front tire 8 suddenly projects below the floor member 3. Are arranged as follows. Therefore, the air flow F flowing near the side portions on the lower side of the floor member 3 is prevented from flowing rearward by the front portion E of the front tire 8, whereby the air flow F near the front portion E of the front tire 8 is prevented. The pressure of stream F is increased.

Therefore, as shown in FIG. 2, the high pressure of the air flow F in the vicinity of the front portion E of the front tire 8 is utilized to smoothly move the air flow F from the inlet 12 into the guide path P of the air flow guide 11. Can be introduced.
At this time, the air flow F introduced from the introduction port 12 into the guide path P is an excessive air flow F that causes an increase in pressure on the lower side of the floor member 3, and this air flow F is introduced from the introduction port 12. Even if it is done, the flow of the air flow F flowing under the floor member 3 is not significantly disturbed. Therefore, it is possible to prevent the air resistance from increasing below the floor member 3 due to the introduction of the air flow F from below the floor member 3 into the engine chamber R. Furthermore, the pressure locally increased in the vicinity of the front portion E of the front tire 8 can be reduced by introducing the air flow F into the guide path P from the introduction port 12. Generally, the increase in pressure in the vicinity of the front portion E of the front tire 8 has been a factor that disturbs the flow of the air flow F flowing under the floor member 3. Therefore, by introducing the airflow F flowing near the front portion E of the front tire 8 via the introduction port 12, the pressure of the increased airflow F can be reduced. As a result, the pressure of the airflow F on the lower side of the floor member 3 is made uniform, so that the airflow F can flow more smoothly on the lower side of the floor member 3.

  The airflow F introduced from the introduction port 12 into the guide path P proceeds rearward in the guide path P as it is and is guided to the discharge port 13 arranged behind the drive unit 9. At this time, the airflow F is guided in the guide path P without contacting the high-temperature drive unit 9, so that it is possible to prevent the temperature from rising while reaching the discharge port 13. Further, since the guide wall 14 is provided so as to completely separate the guide path P and the drive unit 9, it is possible to reliably prevent the temperature of the air flow F guided in the guide path P from rising. can do.

  In this way, by discharging the airflow F in which the temperature rise is suppressed from the discharge port 13 to the rear of the drive unit 9, it is possible to reliably cool the rear part disposed on the rear side of the drive unit 9. . On the rear side of the drive unit 9, for example, rear parts having relatively low heat resistance such as electric components and resin parts are arranged, so that failure and deterioration of the rear parts can be prevented.

  According to the present embodiment, in the vicinity of the front portion of the front tire 8, the inlet 12 opened below the floor member 3 is provided, and at the rear side of the drive unit 9, the outlet 13 opened into the engine chamber R is provided. Since the guide wall 14 is provided from the inlet 12 toward the outlet 13 so as to guide the air flow F flowing under the floor member 3 from the inlet 12 to the outlet 13, The airflow F can be smoothly introduced into the engine chamber R from the lower side to reliably cool the rear part arranged on the rear side of the drive unit 9.

  The discharge port 13 is disposed on the rear side of the drive unit 9, that is, at a position where most of the drive unit 9 passes so that the air flow F discharged from the discharge port 13 does not directly contact the drive unit 9. However, specifically, it is preferable that the drive unit 9 is not disposed so as to face immediately after the discharge port 13. For example, the exhaust portion of the drive unit 9 is provided so as to extend rearward of the vehicle, but if the exhaust portion is not disposed immediately after the discharge port 13, the discharge port 13 is disposed on the side of the exhaust portion. May be.

Embodiment 2
In the first embodiment, it is preferable that the guide wall 14 of the airflow guide 11 be formed so as to extend along the side portion of the engine chamber R.
For example, as shown in FIG. 3, in the first embodiment, the mudguard 21 may be newly arranged, and the airflow guide portion 22 may be replaced with the airflow guide portion 22.

The mudguard 21 is attached along the lower edge of the tire house 7 so as to project downward from the floor member 3. At this time, the mudguard 21 is attached so that its upper edge is exposed in the engine compartment R.
The airflow guide portion 22 has an inlet port 23 formed to open downward at a front portion of the mudguard 21 and an outlet port 24 formed to open inside the engine chamber R near a rear portion of the mudguard 21. A tubular guide wall 25 extending from the inlet 23 to the outlet 24 is provided. The guide wall 25 is integrally provided on the upper edge portion of the mudguard 21, and thus the configuration and attachment of the airflow guide portion 22 can be simplified. In addition, the guide wall 25 can be arranged on the most side of the engine chamber R, and the temperature rise of the airflow F guided through the guide path P can be more reliably suppressed.

Embodiment 3
In Embodiments 1 and 2, the guide wall of the air flow guide is formed in a tubular shape, but the guide wall is provided from the inlet to the outlet so as to guide the air flow from the inlet to the outlet. However, it is not limited to a tubular shape.
For example, as shown in FIG. 4, a guide wall 31 can be provided instead of the guide wall 14 of the first embodiment. The guide wall 31 is formed so as to open the upper part and the outer part facing the tire house 7 except the connection part with the inlet 12. That is, the guide wall 31 is provided so as to stand upright from the floor member 3 and extend from the inlet 12 to the outlet 13, and the air flow F is provided on the opposite side of the drive unit 9 across the guide wall 31. A guide path P for guiding is formed.
In this way, the guide wall 31 can be easily formed by making the guide wall 31 stand upright from the floor member 3.

Embodiment 4
In the first to third embodiments, the front tire 8 constitutes the underfloor protrusion of the present invention which blocks the flow of the air flow F below the floor member 3, but the underfloor protrusion protrudes below the floor member 3. It is not limited to the front tire 8 as long as it obstructs the flow of the air flow F.

For example, as shown in FIG. 5, in the first embodiment, a tire flap 41 is newly attached to the front side of the front tire 8 and an introduction port 42 is arranged in place of the introduction port 12 to form the tire flap 41 according to the present invention. It is also possible to use it as the underfloor protrusion in.
The tire flap 41 suppresses the inflow of the air flow F into the tire house 7 to prevent an increase in air resistance, and projects downward from the floor member 3 along the front edge of the tire house 7. Is provided.
The inlet 42 is formed so as to open below the floor member 3 in the vicinity of the front portion E of the tire flap 41, and introduces an air flow F flowing rearward below the floor member 3 into the guide path P. To do.

As in the first embodiment, the airflow F that flows rearward under the floor member 3 is blocked by the tire flap 41, and the pressure of the airflow F near the front portion E of the tire flap 41 increases. To rise. Thereby, the airflow F flowing under the floor member 3 can be smoothly introduced into the guide path P from the introduction port 42.
The airflow F introduced into the guide path P is guided to the rear side of the drive unit 9 along the guide path P and is discharged to the engine chamber R via the discharge port 13.

According to the present embodiment, in the vicinity of the front portion E of the tire flap 41, the inlet 42 that opens below the floor member 3 is provided, and at the rear side of the drive unit 9 the outlet 13 that opens into the engine chamber is provided. Since the guide wall 14 is provided from the inlet 42 toward the outlet 13 so as to guide the air flow F flowing under the floor member 3 from the inlet 42 to the outlet 13, the floor member 3 is provided. The air flow F can be smoothly introduced into the engine chamber R from the lower side to reliably cool the rear part arranged on the rear side of the drive unit 9.
The underfloor protrusion of the present invention may be, for example, one that abruptly projects downward from the floor member 3 by about 50 mm or more.

Embodiment 5
In Embodiments 1 to 4, it is preferable that the discharge port of the airflow guide unit is arranged on the rear side of the oil pan arranged on the lower side of the engine in the engine chamber R.
For example, as shown in FIG. 6, instead of the discharge port 13 of the first embodiment, the discharge port 52 can be arranged at a position closest to the drive unit 9 on the rear side of the oil pan 51. Here, the oil pan 51 is arranged below the engine in the vicinity of the center of the engine compartment R in the vehicle width direction, that is, below the drive unit 9. Therefore, when the guide wall 14 is provided so as to extend below the drive unit 9, the oil pan 51 may be arranged at the position closest to the guide wall 14, and the oil pan 51 may be released to the rear side of the oil pan 51. By disposing the outlet 52, it is possible to reliably prevent the airflow F emitted from the outlet 52 into the engine chamber R from coming into contact with the drive unit 9. Furthermore, by arranging the discharge port 52 further forward in the range where the airflow F does not contact the drive unit 9, the rear part arranged on the rear side of the drive unit 9 can be cooled in a wide range.

1 windshield, 2 front hood, 3 floor member, 4 fender, 5 front wall part, 6 toe board, 7 tire house, 8 front tire, 9 drive part, 11 and 22 air flow guide part, 12, 23 and 42 inlet , 13, 24, 52 outlet, 14, 25, 31 guide wall, 21 mudguard, 41 tire flap, 51 oil pan, R engine compartment, C compartment, E front of underfloor protrusion, F airflow, P Taxiway.

Claims (5)

An engine compartment cooling structure for cooling an engine compartment, in which a drive section including an engine is arranged inside by a floor member in an automobile, by an airflow,
An underfloor protrusion that protrudes below the floor member,
It has an inlet opening downward from the floor member in the vicinity of the front part of the underfloor protrusion and an outlet opening in the engine chamber on the rear side of the drive unit, and flows under the floor member. An air flow guide portion provided with a guide wall in the engine chamber from the inlet to the outlet so as to guide the air flow from the inlet to the outlet,
The guide wall is an engine compartment cooling structure integrally provided with a mudguard attached to a lower edge portion of a tire house of a front tire. The engine tuft cooling structure according to claim 1, wherein the guide wall has a tubular shape extending from the introduction port to the discharge port. The discharge port, the engine tassel cooling structure according to any one of claims 1 or 2 is disposed on the rear side of the oil pan disposed below the engine in the drive unit. The underfloor protrusion engine tassel cooling structure according to any one of claims 1 to 3, which is a pair of front tires disposed adjacent to both sides of the engine chamber. The underfloor protrusion engine tufts cooling according to any one of claims 1 to 3 both sides a tire flaps attached to the front side of the pair of front tires disposed adjacent the engine tufts Construction.

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