JPH09317582A - Duct with resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce abnormal noises made by the vibration of an engine by joining a pipe-like duct and a resonator with a joint pipe and a joint plate which are formed between the wall of the duct and the wall of the resonator and by corrugating the joint plate. SOLUTION: A joint plate 41 is formed in both sides of a joint pipe 31 between the wall surface of a duct 11 and the wall surface of a resonator 21 to integrate the joint pipe 31, the duct 11 and the resonator 21. The joint plate 41 has reinforced portions 42 which are corrugated in the direction orthogonal to the joint pipe 31 and the corrugated reinforced portions 42 increase the rigidity of the joint plate 41 to increase joining strength of the duct 11 and the resonator 21, which can reduce or prevent the abnormal noises of the resonator 21 which are caused by the insufficient strength for fixing the resonator 21 to the duct 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct with a resonator provided in an intake air tube or the like in an engine room of an automobile.

[0002]

2. Description of the Related Art For example, a duct is installed in an engine room of an automobile to connect a carburetor and an intake manifold of the engine. Also,
This duct is provided with a hollow box-shaped resonator in order to reduce or eliminate the sound generated when the gas passes through the inside.

In recent years, as the duct with the resonator,
FIG. 3 and FIG. 4 showing a section 4-4 thereof, and further 5-5
As shown in FIG. 5 showing a cross section, a tubular duct main body 51 and a box-shaped resonator 52 are connected by a communication pipe 53 formed between the wall surfaces thereof and a connecting plate 54 on both sides of the outer surface thereof, which is made of resin. Proposed. The duct with a resonator of this structure is integrally formed by a known blow molding in which a parison is sandwiched between blow molding dies and inflated. With respect to the connecting plate 54 portion, the parison is pressed by the mold surface of the blow molding dies, It is formed by being crushed. In addition, in the duct with a resonator having the above structure, both end portions 51a of the duct main body 51 are made of a soft resin, and the central portion 51b of the duct main body 51 to the resonator 52 are made of a hard resin.

[0004]

However, in the resonator-equipped duct having the above-described structure, the duct main body 5 includes the communication pipe 53 and the thin connecting plate 54 only at one side of the resonator 52.
Since it is supported by the wall surface of No. 1 and protrudes outward from the wall surface of the duct main body 51, when the duct main body 51 vibrates due to the vibration of the automobile engine, the resonator 52 vibrates more violently than the duct main body 51, causing abnormal noise (So-called chattering noise) may occur.

Therefore, the present invention has been made in view of the above points, and it is an object of the present invention to provide a duct with a resonator in which abnormal noise is less likely to occur due to engine vibration or the like.

[0006]

According to the present invention, a tubular duct body and a resonator are integrally blow-molded by being connected by a connecting pipe and a connecting plate formed between the wall surface of the duct body and the wall surface of the resonator. In the resin duct with a resonator, the connecting plate is provided with an uneven reinforcing portion.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view of a duct with a resonator according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG.

In the duct 10 with a resonator shown in FIGS. 1 and 2, the duct body 11 and the resonator 21 are connected to each other by the communication pipe 3.
1 and blown together with the connecting plate 41,
Made of resin products. The section 3-3 in FIG. 1 has substantially the same shape as that shown in FIG. 5, and the duct main body 11, the resonator 21, and the communication pipe 31 shown in FIGS. Equivalent to 53.

The duct main body 11 is tubular and has one end connected to a carburetor of an automobile and the other end connected to an intake manifold of an engine for flowing air and the like. The duct body 11 of this embodiment
Has a bellows portion 12 made of a soft resin such as modified polyolefin at one end so that the end portion can be bent in accordance with the orientation of the carburetor, intake manifold, or the like. The other part of the duct body 10 is made of polypropylene (P
P), inorganic-added polypropylene (PPF), or glass fiber-added polypropylene (PPG).

The resonator 21 is for reducing or eliminating the sound generated when the gas passes through the inside of the duct body 11, and has a hollow box shape. This resonator 21
The duct body 11 is made of the same resin as the hard resin constituting the portion other than the bellows portion 12.

The communication pipe 31 is for connecting the duct body 11 and the resonator 21 to each other, and has a tubular shape.
It is formed between the wall surface of the duct body 11 and one side wall surface of the resonator 21. The wall surface of the duct main body 11 and the wall surface of the resonator 21 joined to both ends of the communication pipe 31 are open, so that the duct main body 11 and the resonator 21 communicate with each other through the communication pipe 31. The communication pipe 31 is also made of the same resin as the hard resin forming the portion other than the bellows portion 12 of the duct body 11 and the resonator 21.

The connecting plate 41 is for firmly connecting the duct main body 11 and the resonator 21 and is formed between the wall surface of the duct main body 11 and the wall surface of the resonator 21 on both sides of the outer surface of the communication pipe 21. , Duct body 1
1 and the resonator 21 are integrated. The connecting plate 41 is made of the same hard resin as that of the communication pipe 31. Further, the connecting plate 41 has a reinforcing portion 42 that is uneven in a direction substantially orthogonal to the communication pipe 21. The uneven reinforcing portion 42 increases the rigidity of the connecting plate 41, and can increase the connecting strength between the duct body 11 and the resonator 21.

It is preferable that the uneven reinforcing portion 42 is provided almost entirely with respect to the lateral width (width along the longitudinal direction of the duct body 11) of the connecting plate 41 as in this embodiment, but it may be provided partially. Good. Further, the unevenness in this embodiment has a corrugated cross section in which the concave and convex parts are substantially parallel to the connecting pipe 31, and the rigidity of the connecting plate 41 is extremely high due to the wall surface 43 of the unevenness. Moreover, the concavo-convex shape of the connecting plate 41 is, when the duct 10 with the resonator is blow-molded,
Since the parison can be bent and formed so as to be sandwiched between the mold surfaces of the blow molding dies, it is easy to further increase the rigidity of the connecting plate 41 by setting the height (depth) a of the unevenness large.

In the duct 10 with a resonator thus constructed, one end of a duct body 11 is connected to a carburettor of an automobile, and the other end of the duct body 11 is connected to an intake manifold of an engine. Then, the sound generated when the gas passes through the inside of the duct main body 11 is reduced or eliminated by the resonator 21 communicating with the duct main body 11 via the communication pipe 31.

Further, the duct 10 with the resonator is
Connecting plate 4 having increased rigidity due to the uneven reinforcing portion 42
1, the resonator 21 and the duct body 11 are firmly connected. Therefore, when the duct body 11 vibrates due to the vibration of the automobile engine or the like, the resonator 21 and the duct body 11 vibrate integrally, and it is difficult for abnormal noise caused by different vibrations of the both to occur.

[0016]

As shown and described above, in the duct with the resonator of the present invention, since the connecting plate connecting the duct body and the resonator is provided with the uneven reinforcing portion,
The rigidity of the connecting plate can be increased, and abnormal noise of the resonator due to insufficient fixing strength of the resonator to the duct body can be reduced or prevented. Moreover, since the reinforced portion of the unevenness can be formed when the duct with the resonator is blow-molded and no extra molding work is required, the manufacturing of the duct with the resonator is not complicated.

[Brief description of drawings]

FIG. 1 is a perspective view of a duct with a resonator according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view showing an example of a conventional duct with a resonator.

4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a sectional view taken along the line 5-5 in FIG. 3;

[Explanation of symbols]

 10 Duct with Resonator 11 Duct Main Body 12 Bellows Part 21 Resonator 31 Communication Pipe 41 Connecting Plate 42 Uneven Reinforcing Part

Claims (1)

[Claims] 1. A resin-made duct with a resonator in which a tubular duct body and a resonator are integrally blow-molded by being connected by a connecting pipe and a connecting plate formed between the wall surface of the duct body and the wall surface of the resonator, A duct with a resonator, wherein the connecting plate is provided with an uneven reinforcing portion.