JP2001304059A - Engine cover integral with resonator and engine cover integral with resonator equipped with air intake duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine cover integral with a resonator and an engine cover integral with a resonator equipped with an air intake duct which enable the installation of a resonator with occupying little space and without lengthening an air instake passage. SOLUTION: A hollow unit 1 partitioned and formed into one or plural hollow chambers S by blow molding is used as the resonator 2. The hollow unit 1 constitutes a part or the whole of an engine cover body 3. A communicating tube 4 installed in the hollow unit 1 and an intake air duct part 5 connected to the communicating tube 4 is integrally molded in the hollow unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonator-integrated engine cover installed in an engine room of a vehicle and a resonator-integrated engine cover with an intake duct.

[0002]

2. Description of the Related Art In recent years, the demand for noise reduction in automobiles has been increasing year by year, and the intake system of an engine has become particularly severe. Until now, resonators and side branches have been used to reduce intake system noise.However, recently, with the reduction in the number of parts and the reduction in space, the capacity of silencers such as resonators has been reduced or eliminated. Tend to. Further, development of alternative items such as tuning holes for the high frequency band (100 Hz or more) is in progress.

[0003]

However, in order to reduce the noise in the low frequency band (100 Hz or less), it is necessary to use a large-capacity resonator. This is because the frequency to be attenuated is reduced by increasing the capacitance, and the amount of attenuation can be increased.

[0004] Since the capacity of the low-frequency resonator becomes large, it can be set only in a very limited specific position in the engine room. In addition, there is a problem in that the installation of the equipment is limited and the intake path becomes long. Further, with a conventional resonator such as injection molding, at most two hollow chambers (rooms having two kinds of resonance frequencies) can be formed. In addition, since the resonator is manufactured separately, the cost is high.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a resonator-integrated engine cover and a resonator-integrated engine cover with an intake duct that can be installed in a small space and without increasing the length of the intake path. The purpose is to:

[0006]

In order to achieve the above object,
The gist of the invention according to claim 1 is that a hollow device partitioned into one or a plurality of hollow chambers is used as a resonator, and the hollow device forms a part or the whole of an engine cover body. The present invention provides a resonator-integrated engine cover. According to a second aspect of the present invention, there is provided a resonator-integrated engine cover according to the first aspect, wherein a communication pipe for connecting to the intake duct is formed integrally with the hollow vessel. The gist of the invention according to claim 3 is that a hollow device partitioned into one or a plurality of hollow chambers by blow molding is used as a resonator, and the hollow device forms a part or all of an engine cover body, Further, there is provided a resonator-integrated engine cover with an intake duct, wherein a communication pipe attached to the hollow vessel and an intake duct portion connected to the communication pipe are formed integrally with the hollow vessel.

According to the first aspect of the present invention, when the hollow device is used as a resonator and the hollow device constitutes a part or the whole of the engine cover body, there is almost no place for installing the resonator other than the engine cover. . As in the second and third aspects of the present invention, when the communication pipe and the intake duct are integrally formed by blow molding or the like, the number of parts is reduced, leading to cost reduction.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a resonator-integrated engine cover and a resonator-integrated engine cover with an intake duct according to the present invention. 1 to 9
An embodiment of the resonator-integrated engine cover of the present invention and a resonator-integrated engine cover with an intake duct,
1 to 5 are perspective views or sectional views showing various embodiments of a resonator-integrated engine cover, and FIGS. 6 to 9 are perspective views showing various embodiments of a resonator-integrated engine cover with an intake duct. It is sectional drawing.

(1) Resonator-integrated engine cover In this resonator-integrated engine cover, the hollow device 1 made by blow molding constitutes a part or the whole of the engine cover body 3. A part or the whole of the engine cover main body EC which has been plate-shaped as shown in FIG.
It is intended to be used as. First, the resonator-integrated engine cover of FIG. The engine cover body 3 according to the engine cover is manufactured by blow molding, and at this time, the hollow container 1 is hollow. A resin plate portion having a predetermined thickness t (a front plate portion 1a, a rear plate portion 1b, an upper plate portion 1c, and a top plate portion 1c shown in FIG. 1) obtained by sandwiching a parison in a mold and blowing blow air to perform blow molding.
The hollow chamber S is formed by the bottom plate portion 1d and the left and right side plate portions 1e and 1f). The height D (D≫t) of the engine cover body 3 is set to be larger than the conventional plate-shaped engine cover plate thickness, and the hollow container 1 having a space inside is obtained. Regarding the engine cover body 3, there is usually no inconvenience even if the height D is slightly increased, and there are many cases where there is sufficient space in a narrow engine room. The hollow device 1 is used as a resonance box of the resonator 2. A drain hole 13 is formed in the bottom plate 1d as needed. The drain hole 13 can be formed by post-processing, or can be formed as a blow hole at the time of molding. By providing the drain hole 13, the moisture that has entered the resonator 2, that is, the condensed water or the condensed moisture via the intake duct 5 can be smoothly discharged out of the system. The drain hole 13 is provided at the lower end (FIG. 2) of the bottom plate portion 1d (FIG. 1) or the left and right side plate portions 1e and 1f.

[0010] On the other hand, the hollow vessel 1 has a substantially rectangular shape as shown in Fig. 1 so that it can be used also as an engine cover for reducing engine noise and the like. Here, the hollow body 1 itself forms the engine cover body 3.
Although not shown, a screw hole or the like for attaching the present engine cover to a mating member is appropriately provided in the cover body 3. Is Kutsugaechaku the upper surface EH ₁ of an automobile engine (see FIG. 7), the fuel injection valve is used as an engine cover for absorbing camshaft, their sound becomes noise generating source such as a fuel pump.

In the engine cover body 3 shown in FIG. 1, a cylindrical communication pipe 4 is formed integrally at a substantially center of the side plate portion 1e during blow molding. The communication pipe 4 here is a short pipe. The communication pipe 4 is connected to a hole 6 of a separate intake duct body 6.
By connecting and fixing it to 1, it is incorporated in a vehicle as an intake duct with a resonator. Although the cost increases, the engine cover main body 3 in FIG. 1 can be divided by injection molding, and these can be bonded together to form an engine cover.

FIG. 2 shows a resonator-integrated engine cover.
The shape as shown in FIG. 3 can also be used. FIG. 2 is a perspective view of a resonator-integrated engine cover of another embodiment which is a modification of FIG. 1, and FIG. 3 is a view taken along the line II of FIG. This resonator-integrated engine cover is provided with two hollow chambers S ₁ and S ₂ . Engine cover body 3 according to the engine cover
Is made from a parison at a given thickness t
(A front plate portion 1a, a rear plate portion 1b, an upper plate portion 1c, a bottom plate portion 1d, left and right side plate portions 1e and 1f and a partition plate portion 31) are formed to form the hollow container 1. In FIG. 3, at the time of blow molding of the hollow container 1, the parison located at the central portion on the rear surface side of the cover main body is pushed toward the flat upper surface side 1a. At the same time as the formation of the overlapping portion 39, the engine cover body 3 is divided into _two partitioned hollow chambers S ₁ and S ₂ by forming the partition plate portion 31. The overlapping portion 39 is formed by integrating the bottom plate parison with the upper plate parison. Also, two hollow chambers S ₁ , S ₂
A communication pipe 4 is formed integrally with the engine cover body 3 on each side plate portion 1e. Hollow chambers S ₁ , S ₂ and communication pipe 4
The hole 12 is inevitably formed by blow molding at the joint with
The hollow chamber S and the communication pipe 4 conduct. Each hollow chamber S in FIG. 2 is a resonance box of the resonator 2. If the capacities of the _two hollow chambers S ₁ and S ₂ are different, a hollow chamber 1 (resonator 2) having two resonance frequencies can be obtained. On the other hand, as described above, the shape of the hollow device 1 is the upper surface EH _{1 of the} automobile engine.
To form a board-shaped engine cover main body 3 that absorbs mechanical noise of the engine and is a resonator-integrated engine cover. The engine cover body 3 is made up of two hollow containers 1 and 1 and an overlapping portion 39. The rear surface of the engine cover body 3 has irregularities in the bottom plate portion 1d, the overlapping portion 39, and the like, and has a distorted shape. Having. At the same time, hollow device 1 that becomes a resonator
Can reduce the noise emitted from the intake ducts 5 and 6.

The resonator-integrated engine cover may be a hollow container 1 having a hollow inside as shown in FIG. FIG. 4 is a perspective view of a resonator-integrated engine cover of another embodiment which is a modification of FIG. 1, and FIG. 5 is a view taken along line II-II of FIG. By depositing the engine cover body 3 to the engine top EH _1, there are cases where the oil cap will be covered. Here, a conical depression 35 is formed in the hollow container 1, and an opening is provided to penetrate from the upper plate 1c to the bottom plate 1d. By using the oil cap opening 36, oil can be injected without removing the engine cover with the integrated resonator.

In FIG. 4, when the hollow container 1 is blow-molded, the parison portion at the upper end is crushed to form the mounting piece 34 integrally with the engine cover body 3. Reference numeral 34a denotes a hole for attaching the engine cover to a mating member. Other configurations are the same as those of the resonator-integrated engine cover of FIG. 1, and a description thereof will be omitted. 1 denote the same or corresponding parts.

(2) Resonator-integrated engine cover with intake duct This resonator-integrated engine cover with intake duct is
The intake duct portion 5 is further integrated with the resonator-integrated engine cover as shown in FIGS. 1 to 6 by blow molding. For example, a resonator-integrated engine cover with an intake duct as shown in FIGS. 6 and 7 can be provided. FIG. 6 is a perspective view of a resonator-integrated engine cover with an intake duct, and FIG. 7 is a view taken along line III-III in FIG.
The hollow device 1 partitioned into two hollow chambers S by blow molding functions as a resonator 2, and the hollow device 1 plays a part of the engine cover body 3. Then, a communication pipe 4 is provided in the hollow device 1, and further, an intake duct portion 5 communicating with the communication pipe 4 is formed by integral molding.

The engine cover body 3 is hollow with a flat upper surface.
Although it is a board-like body, the intake duct part 5
The vehicle runs in the front-rear direction at the center, and communication pipes 4 are provided on both sides.
The hollow device 1 is provided through the intermediary. Blow forming of hollow container 1
At the time of forming, the bottom plate portion 1d is made so as to leave a semicircular hole for the communication pipe 4.
The parison on both sides of the air intake duct 5
Punch into the lisson to form the crushed portion 18 at the same time
You. The formation of the communication pipe 4 and the crushed portion 18 allows the end to be formed.
The gin cover body 3 has two partitioned hollow chambers S. ₁, S
₂And an intake duct portion 5. The communication pipe 4 is
At the place where crushing was avoided, the hollow chamber S and the intake duct flow path R
It becomes an entrance to connect. The intake duct 5 is in front of and behind the vehicle
7 and the left end 52 of the intake duct 5 in FIG.
And the right end 53 is the air cleaner side. Intake duct
G part 5 traverses the engine cover body 3 in the longitudinal direction of the vehicle.
The intake air is located on the front side of the vehicle
The fresh air F introduced from the duct 6a is
The air intake duct 6b on the rear side
Short-distance intake air to engine EH via Lina 7
Can be sent. Reference numeral 71 denotes a filter.
The linear intake duct portion 5 forming the gas flow path R is
Since it is electrically connected to the hollow vessel 1 through the communication pipe 4, the suction duct
Noise generated at the point 5 can be reduced.

Further, a resonator-integrated engine cover with an intake duct as shown in FIGS. 8 and 9 can be provided.
FIG. 8 is a perspective view of a resonator-integrated engine cover with an intake duct, and FIG. 9 is a view taken along line IV-IV in FIG. This engine cover with a resonator with an intake duct has a box-shaped hollow container 1
A communication pipe 4 and an intake duct portion 5 are integrally formed with the hollow device 1. At the time of blow molding,
A portion excluding the communication pipe 4, for example, a cover portion 37 and the like is crushed. Needless to say, in the case shown in FIG. 8, the engine cover on the front side and the box with the upper opening for the resonator 2 are formed separately by injection molding or the like, and then bonded by post-processing to form a resonator-integrated engine cover with the hollow unit 1. May be. Here, the position of the duct portion 5 is set lower than the communication pipe 4 as shown in FIG. In such a case, the drain hole 13 may be eliminated.

(3) Effects The thus configured resonator-integrated engine cover and the resonator-integrated engine cover with the intake duct have a structure in which a part or the whole of the conventional plate-shaped engine cover body 3 is formed into the hollow unit 1 and the intake duct is formed. Since it is shared as the resonator 2 of the portion 5, it is extremely effective in view of the current situation where it is difficult to secure the space for the resonator 2 in the engine room where the space is reduced. An engine cover body 3 for suppressing noise generated from the engine and a resonator useful for reducing noise generated from the intake ducts 5 and 6 are provided. By using the engine cover main body 3 occupying a large area, the resonator 2 having a large capacity can be obtained, so that the noise reduction effect is also increased. It is effective in reducing noise in the low frequency band, which cannot be solved unless a large-capacity resonator 2 is used. Since the engine cover body 3 is usually large, if the hollow chamber S is divided into two or more, the capacity of the hollow chamber can be changed to reduce noise in different low frequency bands, and the effect can be further enhanced. . Tuning corresponding to various frequency bands can be performed by the fitting method of the hollow device 1 and the intake duct portion 5 and the capacity adjustment of the hollow device 1, that is, the resonator 2. Tuning to a high frequency band as well as a low frequency band is possible.

Further, since the intake duct portion 5 is originally provided around the engine cover, the intake path can be shortened, which is convenient. In addition, since the cover body 3 is made of the blow-molded hollow container 1 and is used in combination with the resonator 2, the production cost is lower than that of the resonator 2 conventionally manufactured separately. The communication pipe 4 and the part 5 of the intake duct (primary-side intake intake) can be integrally formed with the hollow device 1, so that the production cost is further reduced. The number of parts is also reduced, and inventory management becomes easier.

The present invention is not limited to the embodiment described above, but can be variously modified within the scope of the present invention depending on the purpose and application. The shape, size, number, material, and the like of the hollow device 1, the communication pipe 4, the intake duct portion 5, and the like can be appropriately selected according to the application. In the embodiment, only one or two hollow chambers S are formed, but the hollow chambers 1 formed in a larger number are used as the resonators 2 and the hollow chambers 1 are used as the cover bodies 3. Of course you can.

[0021]

As described above, the resonator-integrated engine cover and the resonator-integrated engine cover with the intake duct of the present invention require almost no installation space for the resonator and a low-frequency band without lengthening the intake duct path. It is possible to install a resonator which helps to reduce the noise of the vehicle, which is extremely useful in an engine room where space is being reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a resonator-integrated engine cover of the present invention.

FIG. 2 is a perspective view of a resonator-integrated engine cover different from that of FIG. 1;

FIG. 3 is a view taken along line II of FIG. 2;

FIG. 4 is a perspective view of a resonator-integrated engine cover different from that of FIG. 1;

FIG. 5 is a view taken along the line II-II in FIG. 4;

FIG. 6 is a perspective view of an embodiment of a resonator-integrated engine cover with an intake duct according to the present invention.

FIG. 7 is a view taken along line III-III in FIG. 6;

FIG. 8 is a perspective view of a resonator-integrated engine cover with an intake duct of another embodiment different from that of FIG. 6;

9 is a view taken in the direction of arrows IV-IV in FIG. 8;

FIG. 10 is an explanatory diagram of a conventional technique.

[Description of Signs] 1 Hollow device 2 Resonator 3 Cover body (Engine cover body) 4 Communication pipe 5 Intake duct (Intake duct part) S Hollow chamber

Claims (3)

[Claims] 1. A resonator wherein a hollow device partitioned into one or a plurality of hollow chambers is used as a resonator, and said hollow device constitutes a part or all of an engine cover body. Integrated engine cover. 2. The resonator-integrated engine cover according to claim 1, wherein a communication pipe for connecting to the intake duct is formed integrally with the hollow device. 3. A hollow device partitioned into one or a plurality of hollow chambers by blow molding is used as a resonator, and the hollow device forms a part or all of an engine cover main body. A resonator-integrated engine cover with an intake duct, wherein a communication pipe to be attached and an intake duct portion connected to the communication pipe are formed integrally with the hollow vessel.