JPH11170875A - Air duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air duct whereby cool air is efficiently guided to an air cleaner of an on-car engine, and an engine noise can be well shielded. SOLUTION: An air duct 1 comprises a main body 2, bellows-shaped communication pipe 3, and an air introducing pipe 4, the main body 2 has a flat air passage 14 and a blade part in both sides thereof, to be bolt locked to a cylinder head cover 22 so as to cover an upper surface of the cylinder head cover 22 of an on-car engine, the air passage 14 is connected to an air cleaner 23 in the rearward, on the other hand, the air introducing pipe 4 is screw locked to an upper bar 24 in a car width direction arranged in the upward of a car body front end, to be opened to the forward of a vehicle just under an engine hood.

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 guiding intake air to an air cleaner of an engine mounted on a vehicle, and more particularly to an air duct having a function of shielding engine noise.

[0002]

2. Description of the Related Art A conventional air duct for guiding intake air to an air cleaner of an engine mounted on a passenger car or the like has a front end opening near the back side of a headlamp and bypasses accessory devices such as a battery disposed in an engine room. While extending to the rear of the vehicle while being connected to an air cleaner installed near the cylinder head of the engine,
In this case, the air duct must be bent greatly in the vehicle width direction in order to avoid interference with accessories such as a battery. Due to the resistance of the outside air to flow due to the outside air and the like, warm air in the engine room is easily taken into the air duct as intake air, so that there is a problem that the actual intake efficiency of the engine is reduced accordingly. On the other hand, when the upper surface of the engine is exposed in the engine room, it is difficult to shield the engine noise and there is a disadvantage that the appearance in the engine room is not good.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air duct which can guide intake air relatively efficiently to an air cleaner or the like of an engine mounted on a vehicle and can shield engine noise satisfactorily. is there.

[0004]

Therefore, in the air duct according to the first aspect of the present invention, a flat air passage is formed in a substantially horizontal direction, and covers the upper surface of the cylinder head cover of the vehicle-mounted engine. An air intake that is attached and opens to the front of the vehicle, and an air discharge passage that extends to the rear of the vehicle and communicates with the air cleaner is connected to the air passage.

That is, the air duct attached to the cylinder head cover, covering the upper surface of the cylinder head cover of the vehicle-mounted engine, has a flat air passage formed in a substantially horizontal direction. The air passage has an air intake opening to the front of the vehicle, An air exhaust passage extending to the rear of the vehicle is connected, and the entire passage extends in the front-rear direction of the vehicle, so that the intake air introduced from the air intake can be efficiently guided from the air exhaust passage to the air cleaner behind the vehicle. On the other hand, since the air passage that is flat in the substantially horizontal direction covers the upper surface of the cylinder head cover, noise of the vehicle-mounted engine can be well shielded.

The air duct according to claim 2 of the present invention is the air duct according to claim 1, which is attached to a vehicle body and opens at a front end of the vehicle body, and the air introduction pipe, the air passage, And a soft bellows-like communicating pipe which is arranged between them and connects them.

[0007] Therefore, the air duct can relatively easily and surely take in cool air from the air introduction pipe opening at the front end of the vehicle body, and can be mounted on the air passage portion mounted on the cylinder head cover of the vehicle engine. Vibration applied from the engine is absorbed by the soft bellows-like communication pipe that connects between the air introduction pipe and the air passage and is easily transmitted to the vehicle body with the air introduction pipe attached. Can be prevented.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention shown in the drawings will be described by assigning the same reference numerals to the same parts. 1 to 4, an air duct 1 includes a resin main body 2, a bellows-like communication pipe 3 made of a soft resin, and a resin air introduction pipe 4, and the main body 2 is formed of a base 5 and a lid 6. ing.

The base 5 has a plate-like shape as a whole, and has a central recess 7 extending in a substantially horizontal direction and wings 8 extending to both sides of the recess 7, and communicates with the recess 7 at one end. A trumpet-shaped air discharge pipe 9 is integrally formed, and a flat air intake section 10 having a substantially U-shaped cross section is integrally formed at the other end.

On the other hand, a flat air intake portion 12 having a substantially U-shaped cross section is integrally formed at one end of the flat plate portion 11 with the lid portion 6.
The flat plate portion 11 is fitted into the base 5 so as to cover the recess 7, and the air intake portion 12 is combined with the air intake portion 10 to form an air intake tube 13, and the peripheral edge of the lid portion 6 is bonded to the base portion 5. Alternatively, by welding, air passages 14 which are flat in the substantially horizontal direction and communicate with the air discharge pipe 9 and the air intake pipe 13 are formed, and a sound absorbing material (not shown) is attached to the entire lower surface of the main body 2. .

The main body 2 is disposed on a cylinder head cover 22 of an engine 21 installed in an engine room 20 of a passenger car or the like, and has a bolt hole 1 formed in the main body 2.
5 is attached to the cylinder head cover 22 with a rubber insulator interposed therebetween by a bolt (not shown) inserted from above, and covers almost entirely the upper surface of the cylinder head cover 22, and a strip around the end of the air discharge pipe 9. The air discharge pipe 9 is connected to the air cleaner 23 in a state where the sponge is wound.

Further, the tip of the air intake pipe 13 is fitted into one end of the bellows-shaped communication pipe 3, and one end of the air introduction pipe 4 is fitted into the other end of the bellows-shaped communication pipe 3. Is connected to the air passage 14 by the communication pipe 3, so that the air introduction pipe 4, the bellows-shaped communication pipe 3, the air intake pipe 13,
The air passage 14 and the air discharge pipe 9 are arranged substantially linearly in the vehicle front-rear direction, and the other end of the air introduction pipe 4 is connected to the upper bar connecting the front upper ends of both side walls in the engine room 20 in the vehicle width direction. The screw 24 is screwed to a substantially central upper surface of the hood 24 and opens right below the tip of a hood 25 that covers the engine room 20.

In the above device, the air passage in the air duct 1 is generally flat, but no accessories are arranged above the cylinder head cover 22. Therefore, the air is sequentially passed from the front end of the vehicle to the rear air cleaner 23. Since the pipe 4, the bellows-shaped communication pipe 3, the air intake pipe 13, the air passage 14, and the air discharge pipe 9 are formed substantially linearly, the resistance of the air flowing through the inside thereof is relatively small, and furthermore, the air The tip of the introduction pipe 4 is a hood 25
It opens almost at the center in the vehicle width direction just below the tip,
Since the cool air can be easily taken in from the front of the vehicle, the cool air can be efficiently guided to the air cleaner 23, and the suction efficiency to the engine 21 can be reliably improved.

The air duct main body 2 covers almost the entire upper surface of the cylinder head cover 22 with the flat air passage 14 and the wings 8 extending to both sides thereof, and a sound absorbing material is attached to the entire lower surface. So engine 2
1, the air duct body 2 connected to the engine 21 and the air introduction pipe 4 connected to the vehicle body are made of a soft resin bellows. Since the vibration transmitted from the engine 21 to the air duct main body 2 can be easily blocked from being transmitted to the air introduction pipe 4 by being connected by the shape communication pipe 3, noise and vibration as a vehicle can be easily suppressed. There are great advantages.

Further, since the upper surface of the engine 21 is covered by the flat air duct body 2, when the hood 25 covering the engine room 20 is opened upward, the appearance in the engine room 20 can be remarkably improved. There are also advantages.

In the above embodiment, the flat portion of the lid is configured to close the recess formed in the base of the air duct main body. However, as shown in FIG. The base 31 has a substantially flat plate-like shape, and a bottom 31 having a flat depression 7 and depressions 30 on both sides thereof.
Is adhered or welded to the lower surface of the base 5 to form a substantially horizontal flat air passage 14 by the base 5 and the recess 7, and a resonator 32 communicating with the air passage 14 by the base 5 and the recess 30. The sound absorbing material is applied almost entirely over the lower surface of the bottom portion 31 and the lower surface of the base portion 5 not covered by the bottom portion 31, and the other portions have the same structure as the above embodiment. The same advantageous effects as in the example can be obtained, and further, there is an advantage that noise generated from the flow of intake air in the air passage 14 can be reduced by the resonator 32.

[0017]

In the air duct according to the first aspect of the present invention, the entire air passage extends in the front-rear direction of the vehicle, and the intake air introduced from the air intake is further discharged from the air discharge passage to the air cleaner behind the vehicle. Since the air can be guided efficiently, the intake efficiency of the engine can be reliably improved, and the air passage that is flat in the substantially horizontal direction covers the upper surface of the cylinder head cover, so that the noise of the vehicle-mounted engine is well shielded. And the appearance in the engine room can be improved.

Further, in the air duct according to the second aspect of the present invention, it is possible to relatively easily and surely take in cool air from the air introduction pipe opening at the front end of the vehicle body, The transmission of engine vibrations to the vehicle body is suppressed by the bellows-shaped communication pipe, so that vibrations of the vehicle body can be easily prevented.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of a main part of the embodiment.

FIG. 3 is an enlarged longitudinal sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an enlarged vertical sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is a longitudinal sectional view corresponding to FIG. 3 in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air duct 2 Main body 3 Communication pipe 4 Air introduction pipe 5 Base 6 Lid 14 Air passage 22 Cylinder head cover 23 Air cleaner 24 Upper bar 25 Hood 31 Bottom 32 Resonator

Continued on the front page (72) Inventor Motohiko Hattori 58 Marugo Rubber Industry Co., Ltd., 58 Kamitomii, Kurashiki-shi, Okayama Prefecture (72) Inventor Ryo Arita 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Yukihiro Hattori 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Hiroyuki Nishikawa 5-33-8 Shiba 5-chome, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation

Claims (2)

[Claims] A flat air passage is formed in a substantially horizontal direction and is attached to the cylinder head cover so as to cover an upper surface of a cylinder head cover of an on-vehicle engine. And an air duct connected to the air passage. 2. An air introduction pipe attached to a vehicle body and opening to a front end of the vehicle body according to claim 1, and a soft bellows disposed between the air introduction pipe and the air passage and connecting them. An air duct having a tubular communication pipe.