JP3206372B2 - Engine shielding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a shielding device for improving the cooling performance of a valley between banks in a V-type engine.

[0002]

2. Description of the Related Art A shielding cover provided on an automobile engine or the like covers an upper portion of an engine body inside an engine hood of a vehicle, thereby suppressing noise generated from the engine body from leaking out of an engine room. At the same time, the appearance can be improved (for example,
No. 4535, Japanese Utility Model Application Laid-Open No. 29329/1988, etc.).

Conventionally, a shielding cover provided on a V-type engine having left and right banks opposed to a V-type includes a ceiling wall portion covering from the left and right banks to a valley-shaped recess between banks, and a front wall portion of the engine body. And these are integrally formed using synthetic resin or the like as a material.

[0004]

However, in the V-type engine, since components such as a fuel system and a cooling water system are disposed in the valley between the banks, the cooling air flows through the valley between the banks and the valley of the bank is used. It is necessary to prevent rubber parts and the like from being overheated.

However, in the conventional engine shielding device, the valley between the banks is covered by the front wall of the shielding cover. There is a problem that the flow of the cooling air to be introduced is blocked by the shielding cover, and it is difficult to sufficiently secure the amount of the cooling air guided to the valley between banks.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to improve the cooling performance of a valley between banks in a shielding device for a V-type engine.

[0007]

According to a first aspect of the present invention, there is provided an engine shielding device, wherein an engine body is provided with left and right banks of an engine body opposed to a V-shape, a valley between banks recessed between the left and right banks, and cooling air. A front wall of the main body, a shielding cover covering an upper part of the engine main body, a ceiling wall covering the valley between banks formed on the shielding cover, and a front wall covering the front wall of the engine main body formed on the shielding cover. A cooling wind in which the width of the passage in the engine lateral direction gradually decreases from the opening located at the lower end between the front wall portion of the shielding cover and the engine body toward the valley between the banks. Define the introduction route.

According to a second aspect of the present invention, there is provided an engine shielding device.
The invention according to claim 1, wherein a wind guiding convex wall portion swelling forward of the engine is formed on a front wall portion of the shielding cover, and the cooling air introduction passage is substantially provided between the wind guiding convex wall portion and the engine body. Defined with a trapezoidal cross section.

The engine shielding device according to claim 3 is
The invention according to claim 1 or 2, wherein a wind guide recessed portion recessed rearward of the engine is formed in a front wall portion of the engine main body, and the cooling wind introduction passage is provided between the wind guide recessed wall portion and the shielding cover. Defined with a substantially trapezoidal cross section.

According to a fourth aspect of the present invention, there is provided an engine shielding device.
In the invention according to any one of claims 1 to 3,
A wind guide recessed wall recessed rearward of the engine is formed in a front wall of the engine body, and the cooling air introduction passage is defined by a substantially trapezoidal cross section between the wind guide recessed wall and the shielding cover.

According to a fifth aspect of the present invention, there is provided an engine shielding device.
The invention according to claim 4, further comprising a cooling fan that blows air toward a front wall portion of the engine main body, and an opening located at a lower end of the cooling air introduction passage disposed downstream in a rotation plane of the cooling fan. I do.

[0012]

In the engine shielding device according to the first aspect, the shielding cover covers the upper portion of the engine main body, so that the noise generated from the engine main body can be reduced and the appearance can be improved.

[0013] The running air flowing into the engine room and the cooling air consisting of the air blown into the engine room through the cooling fan hits the front wall of the engine body.
A part thereof is guided to the valley between banks through a cooling air introduction passage defined between the shielding cover and the cover.

Since the width of the cooling air introduction passage is gradually reduced from the opening toward the valley between the banks, the cooling air passing through the cooling air introduction passage is collected in the valley between the banks, and the valley between the banks is formed. The flow velocity of the passing cooling air can be increased. In this way, a sufficient amount of cooling air guided to the bank valleys can be obtained, so that the heat radiation of the rubber parts and the like constituting the fuel pipes and the cooling water pipes arranged in the bank valleys can be ensured.

According to a second aspect of the present invention, there is provided an engine shielding device, wherein a cooling air introduction path is defined by a substantially trapezoidal cross section by a wind guiding convex wall portion bulging forward from the front wall of the shielding cover. The cooling air passing through the cooling air introduction passage flows into the bank valley along the wind guide convex wall portion, and the flow velocity of the cooling air passing through the bank valley can be increased.

According to a third aspect of the present invention, there is provided a cooling device for an engine, wherein a cooling air introduction path is defined by a substantially guiding trapezoidal cross section by a wind guiding recessed wall recessed rearward of the engine in a front wall of the engine body. The cooling air passing through the wind introduction passage flows into the bank valley along the wind guide concave wall, and the flow velocity of the cooling air passing through the bank valley can be increased.

[0017] In the engine shielding device according to the fourth aspect, the cooling air, which is blown into the engine room via the cooling fan, hits the front wall of the engine body, and most of the cooling air is rotated by the cooling fan. The cooling air is guided to the valley between the banks through the cooling air introduction path defined between the opening located on the downstream side in the plane and the shielding cover, and passes through the cooling air introduction path toward the valley between the banks. The flow rate can be increased.

[0018] In the engine shielding device according to the fifth aspect, the traveling wind flows from the slit opened in the front wall portion of the shielding cover to the middle of the cooling air introduction path, and is located on the downstream side in the rotation plane of the cooling fan. The cooling air flowing into the cooling air introduction passage from the opened opening is merged with the cooling air and guided to the bank valley, and the flow velocity of the cooling air flowing toward the bank valley through the cooling air introduction passage can be further increased. By arbitrarily setting the opening area of the slit, it is possible to appropriately set the cooling performance of the valley between banks.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, an engine body 1 provided in a V-type 6-cylinder engine has left and right banks (cylinder rows) 2 and 3 facing the V-type, and front portions of the left and right banks 2 and 3. And a front cover 4 defining a chain chamber.

As shown in FIG. 3, if the line between the left and right banks 2 and 3 is bisected and a line perpendicular to the crankshaft (not shown) is defined as an interbank centerline B, the interbank centerline B Is defined as a horizontal plane, a direction away from the crankshaft toward the left and right banks 2 and 3 with respect to the bank center line B is defined as upward, and a side where the front cover 4 is provided in the crankshaft direction is defined as front.

As shown in FIG. 4, a cooling fan 6 is provided at the front of the engine body 1, and various auxiliary devices such as an alternator 7, an air conditioner compressor 8, and the like are provided. Is transmitted via a belt and a pulley.

As shown in FIG. 6, the engine body 1 has a valley 9 between the left and right banks 2 and 3 which is depressed like a valley. Six injectors 21 for injecting fuel into the intake ports of the respective cylinders, a fuel pipe 22 for guiding the fuel to each injector 21, and a regulator 23 for adjusting the fuel pressure are provided in the bank valley portion 9. An outlet 24 for guiding, a cooling water pipe, and the like are provided.

As shown in FIG. 5, an intake manifold 25 for guiding intake air to an intake port of each cylinder, a throttle chamber 26 connected to the intake manifold 25, and the like are provided above the bank valley portion 9.

As shown in FIG. 7, a shielding cover 5 for covering the upper part of the engine body 1 is provided. The shielding cover 5 covers the upper portion of the engine main body 1 inside the engine hood of the vehicle, so that noise generated from the engine main body 1 is prevented from leaking to the outside of the engine room, and the appearance is improved.

The shielding cover 5 includes a ceiling wall 11 that covers the left and right banks 2 and 3 and the valley 9 of the engine body 1,
Front wall of front cover 4 (front wall of engine body 1)
And a front wall portion 12 that covers the front wall portion, and these are integrally formed using a synthetic resin or the like as a material.

As shown in FIG. 4, the front cover 4 is fastened to the intake manifold 25 and the like via a plurality of bolts 27 penetrating the ceiling wall portion 11. The ceiling wall 11 has an opening 19 in which the oil filler cap 28 is disposed.

The engine body 1 is mounted in an engine room provided at the front of a vehicle (not shown). The engine body 1 is disposed vertically so that the crankshaft extends in the front-rear direction of the vehicle.

At the front wall of the front cover 4, the traveling wind flowing into the engine room as shown by the broken arrow in FIG. 3 and the cooling fan as shown by the solid white arrow in FIG. Cooling air consisting of blown air taken into the engine room via 6 is applied.

By the way, in the conventional structure in which the front wall of the shielding cover is formed in a flat plate shape, the flow of the cooling air which flows into the valley between the banks after hitting the front wall of the engine main body is generated by the front wall of the shielding cover. It is difficult to secure a sufficient amount of cooling air that is blocked by the
There is a possibility that the heat radiation of the rubber parts and the like constituting the fuel pipe and the cooling water pipe disposed in the bank valley may be deteriorated.

In accordance with the present invention, in order to cope with this, between the front wall portion 12 of the shielding cover 5 and the front cover 4, the flow in the engine lateral direction gradually from the opening 13 located at the lower end thereof toward the bank valley portion 9. The cooling air introduction path 14 whose path width is reduced is defined.

In this embodiment, the front wall 12 of the shielding cover 5
Left and right airflow convex walls 16 and 17 are formed at the front of the engine so as to protrude opposite to each other.
7, a cooling air introduction passage 14 is defined with a substantially trapezoidal cross section.

The upstream wind guide wall 16 and the downstream wind guide wall 17 extend so as to be connected to each other, and are formed to be inclined with respect to the center line B between the banks. The width in the engine front-rear direction of the downstream wind guiding convex wall portion 17 is formed larger than the upstream wind guiding convex wall portion 16.

As shown in FIG. 2, a clearance C ₂ between the front wall 12 of the shielding cover 5 and the front cover 4 defining the cooling air introduction passage 14 defines a space 18 provided on the left and right of the cooling air introduction passage 14. The clearance C ₁ is larger than the clearance C ₁ between the front wall portion 12 of the shielding cover 5 and the front cover 4.

The opening 13 of the cooling air introduction passage 14 is formed so as to be located on the downstream side in the rotation plane F of the cooling fan 6. Thereby, most of the air blown into the engine room via the cooling fan 6 flows into the cooling air introduction passage 14.

As shown in FIG. 3, a plurality of slits 15 are formed in the front wall portion 12 of the shielding cover 5 between the left and right wind guiding convex wall portions 16 and 17. Each slit 15 is opened in the middle of the cooling air introduction path 14 defined between the left and right wind guiding convex wall portions 16 and 17.

Each of the slits 15 is located on the front wall portion 12 of the shielding cover 5 outside the rotation surface F of the cooling fan 6, and is opened at an upper portion against which the traveling wind flowing into the engine room when the vehicle travels. .

The configuration is as described above. Next, the operation will be described.

The running air flowing into the engine room when the vehicle is running and the cooling air consisting of air blown into the engine room via the cooling fan 6 hits the front wall of the front cover 4 and then a part of the cooling air. The cooling air is introduced to the upper part of the engine body 1 through the cooling air introduction passage 14 and the left and right spaces 18 defined between the shielding cover 5 and the engine.

The cooling air introduction passage 14 has an opening 1
Since the cooling air gradually decreases from 3 toward the bank valley 9, the cooling air passing through the cooling air introduction passage 14 is collected in the bank valley 9 as shown by the arrow in FIG. That is, the cooling air passing through the cooling air introduction passage 14 flows into the valley 9 between the banks along the left and right wind guiding convex walls 16 and 17,
The flow velocity of the cooling air that passes over the front cover 4 and moves toward the bank valley 9 can be increased. In this way, a sufficient amount of cooling air guided to the bank valley 9 can be obtained, so that the heat radiation of rubber parts and the like constituting the fuel pipe and the cooling water pipe provided in the bank valley 9 can be ensured. it can.

The traveling wind flows into the cooling air introduction passage 14 from each slit 15 opened in the front wall 12 of the shielding cover 5, and flows from the opening 13 located on the downstream side in the rotation plane F of the cooling fan 6. The cooling air flowing into the cooling air introduction passage 14 is joined to the bank valley 9 by being joined thereto, and the flow velocity of the cooling air flowing toward the bank valley 9 through the cooling air introduction passage 14 can be increased.
By setting the opening area of each slit 15 arbitrarily, it is possible to secure a predetermined cooling property in the valley 9 between the banks.

FIG. 8 shows an experimental result of measuring the temperature of each part in the valley 9 between the banks. From this experimental result,
Compared with a developing product in which the flow width of the cooling air introduction passage defined by the front wall of the shielding cover is formed to be constant, the flow passage width of the cooling air introduction passage 14 according to the present embodiment increases from the opening 13. It can be seen that the temperature of each part is lower in the device that is gradually reduced toward the bank valley part 9. In particular, the rate of decrease in the surface temperature of the fuel outlet hose 28 located behind the front cover 4 is large.

Next, the embodiment shown in FIGS. 9 to 11 will be described. Note that parts corresponding to those in FIG. 1 and the like are denoted by the same reference numerals.

In the present embodiment, the front wall 12 of the shielding cover 5
Are formed in the shape of a flat plate, and left and right air guide concave walls 33 are formed on the front wall 32 of the front cover 4 so as to face each other in front of the engine. The cooling air introduction passage 14 is defined by a substantially trapezoidal cross section.

The left and right air guiding concave walls 33 are formed to face each other and to be inclined with respect to the center line B between the banks.

The front wall 1 is attached to the upper wall 35 of the front cover 4.
Left and right air guiding concave wall portions 3 that are connected to the second air guiding concave wall portion 33 and are depressed.
6 are formed. The left and right air guiding concave wall portions 36 face each other and are formed to be inclined with respect to the center line B between banks.

As shown in FIG. 10, the front wall 12 and the front cover 4 of the shielding cover 5 defining the cooling air introduction passage 14 are provided.
Clearance C ₄ of is larger than the clearance C ₃ of the front wall 12 and the front cover 4 of the shielding cover 5 which defines a space 18 provided on the left and right of the cooling air introduction path 14.

The shielding cover 5 that defines the cooling air introduction path 14
Clearance C ₆ between ceiling wall 11 and front cover 4
Are the ceiling wall 11 of the shielding cover 5 and the front cover 4 that define the space 18 provided on the left and right of the cooling air introduction passage 14.
It is larger than the clearance C ₅ of.

The configuration is as described above, and the operation will now be described.

The running air flowing into the engine room when the vehicle is running and the cooling air consisting of the air blown into the engine room via the cooling fan 6 hits the front wall 32 of the front cover 4 and a part thereof. Is defined between the cooling air introduction passage 14 and the left and right spaces 18.
And is guided to the upper part of the engine body 1.

The cooling air introduction passage 14 has an opening 1
Since the cooling air gradually decreases from 3 toward the bank valley 9, the cooling air passing through the cooling air introduction path 14 is collected in the bank valley 9 as shown by the arrow in FIG. That is, the cooling air passing through the cooling air introduction passage 14 flows along the left and right air guiding concave walls 33, and then flows into the left and right air guiding concave walls 33.
Over the front cover 4 along the road
And the flow velocity of the cooling air flowing through the bank valley 9 can be increased. In this way, a sufficient amount of cooling air guided to the bank valley 9 is obtained, and heat radiation of rubber parts and the like constituting the fuel pipe and the cooling water pipe disposed in the bank valley 9 can be ensured. .

[0052]

As described above, in the engine shielding device according to the first aspect, the cooling air hitting the front wall portion of the engine body passes through the cooling air introduction passage whose flow passage width is gradually reduced. Thereby, the flow velocity of the cooling air flowing toward the bank valley is increased, and the heat resistance of the rubber parts and the like constituting the fuel pipe and the cooling water pipe provided in the bank valley is improved.

The engine shielding device according to claim 2 is
With a structure in which the cooling air introduction path is defined by a substantially trapezoidal cross section by the wind guide convex wall part swelling forward from the engine from the front wall of the shielding cover, the cooling air passing through the cooling air introduction path is
The flow velocity of the cooling air flowing into the interbank valley along the wind guiding convex wall portion and passing through the interbank valley can be increased.

According to a third aspect of the present invention, there is provided an engine shielding device comprising:
The structure in which the cooling air introduction passage is defined by a substantially trapezoidal cross section by the air guiding recessed wall recessed to the rear of the engine on the front wall of the engine body. The flow velocity of the cooling air flowing into the bank valley along the bank valley and passing through the bank valley can be increased.

The engine shielding device according to claim 4 is
After the cooling air taken into the engine room via the cooling fan hits the front wall of the engine body, most of the air flows between the opening located downstream in the rotation plane of the cooling fan and the shielding cover. The cooling air is guided to the valley between the banks through the formed cooling air introduction path, and the flow velocity of the cooling air flowing toward the valley between the banks through the cooling air introduction path can be increased.

According to a fifth aspect of the present invention, there is provided the engine shielding device,
The traveling wind flows into the cooling air introduction passage from the slit opened in the front wall of the shielding cover, and merges with the cooling air flowing into the cooling air introduction passage from the opening located on the downstream side in the rotation plane of the cooling fan. The flow rate of the cooling air flowing toward the bank valley through the cooling air introduction path is further increased by flowing into the bank valley, and the cooling performance of the bank valley is optimized by arbitrarily setting the opening area of the slit. Can be set to

[Brief description of the drawings]

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

FIG. 2 is a schematic plan view of the engine.

FIG. 3 is a front view of the engine.

FIG. 4 is a plan view of the engine.

FIG. 5 is a side view of the engine.

FIG. 6 is a plan view of a shielding cover and the like.

FIG. 7 is a sectional view of a shielding cover and the like along the line AA in FIG. 3;

FIG. 8 is a chart showing experimental results.

FIG. 9 is a schematic perspective view of an engine showing another embodiment.

FIG. 10 is a schematic plan view of the engine.

FIG. 11 is a schematic front view of the engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine main body 2 Left bank 3 Right bank 4 Front cover 5 Shielding cover 9 Valley between banks 11 Ceiling wall part 12 Front wall part 13 Opening part 14 Cooling air introduction path 15 Slit 16 Guide wind convex wall part 17 Wind guide convex wall part 32 Front cover front wall 33 Wind guiding concave wall 36 Wind guiding concave wall

Claims (5)

(57) [Claims] 1. A left and right bank of an engine body opposed to a V-type, a valley between banks recessed between the left and right banks, a front wall of the engine body to which cooling air is applied, and a shielding cover for covering an upper portion of the engine body. A ceiling wall covering the bank valley formed in the shielding cover; and a front wall covering the front wall of the engine body formed in the shielding cover. An engine shielding apparatus comprising: a front wall of the shielding cover; An engine shielding device characterized in that a cooling air introduction passage is formed between an engine body and an engine body, the cooling air introduction passage gradually decreasing in width in a lateral direction of the engine from an opening located at a lower end thereof toward a valley between banks. 2. A front wall portion of the shielding cover is formed with a convex wind guiding wall portion bulging forward of the engine, and the cooling air introduction passage has a substantially trapezoidal cross section between the convex wind guiding wall portion and the engine body. 2. The method according to claim 1, wherein
An engine shielding device according to claim 1. 3. A concave air guiding wall recessed rearward of the engine is formed in a front wall of the engine body, and the cooling air introduction passage is defined between the concave air guiding wall and the shielding cover with a substantially trapezoidal cross section. The engine shielding device according to claim 1, wherein the engine shielding device is provided. 4. A cooling fan for blowing air toward a front wall portion of the engine body, and an opening located at a lower end of the cooling air introduction passage is disposed on a downstream side in a rotation plane of the cooling fan. The engine shielding device according to any one of claims 1 to 3, wherein: 5. The cooling cover according to claim 4, wherein a slit for introducing a traveling wind is formed in a front wall portion of the shielding cover in the middle of the cooling air introduction path, and the slit is arranged outside a rotation surface of the cooling fan. An engine shielding device according to claim 1.