JPH0861173A - Silencer - Google Patents

Abstract

PURPOSE: To manufacture a silencer by simple work without performing an adjustment to adjust intake air resistance and a silencing effect. CONSTITUTION: A silencer is provided with a first cylindrical part 13 whose one end opens in an inside space and an installing hole 17 communicated with the inside space, and is composed of a main body part 11 which partitions a part of the inside space and is integrally formed by injection molding, a closing part 12 which forms the inside space by being joined with the main body part 11 and is formed by injection molding and a second cylindrical part 14 which is installed in the installing hole 17 and whose one end is opposed at an interval in the inside space to one end of the first cylindrical part 13. Therefore, an adjustment to obtain excellent intake air resistance and silencing effect can be performed by determining a position of the second cylindrical part 14 to the first cylindrical part 13 whose position is fixed, and a manufacturing process is extremely simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer suitable for an intake system of an automobile engine.

[0002]

2. Description of the Related Art Vibration of air generated in an intake stroke of an engine resonates in an intake hose, so that noise called intake sound or pulsating sound is emitted from an intake port of the intake hose. As an intake hose that prevents this pulsating noise, the applicant of the present application has disclosed in the specification of Japanese Patent Application No. 6-88431 that a first hose portion having a split portion formed by spacing the end faces of each other and A main hose composed of a second hose, an outer hose which is arranged on the outer periphery and covers the divided portion, and has an inner diameter larger than the outer diameter of the main hose, both ends of the outer hose, the first hose portion and the second hose There is disclosed an intake hose including a pair of ring members respectively arranged between the outer hose and the first hose part and the second hose part.

The intake hose has a cylindrical closed space formed by an outer hose, a pair of the ring members, and a main hose on the outer periphery of the dividing part, so that the second hose from the first hose part side.
Assuming that air flows to the hose side, the vibration of the air flow flowing through the first hose is disturbed by the sudden expansion of the space in the dividing part, and the resonance sound generated in the first hose is separated and pulsating sound is generated. It is intended to be reduced.

By the way, in the above-mentioned intake hose, the larger the volume of the cylindrical closed space is, the more excellent the noise prevention effect is, and it is clear that the frequency of the sound capable of reducing the sound pressure level varies depending on the shape of the cylindrical closed space. Has become.
Therefore, especially when quietness is required, the outer hose is used as an intake system developed into a muffler having a resonator chamber and an expansion chamber.

[0005]

The above-mentioned muffler is shown in FIG.
As shown in FIG. 1, a first hose portion 2 and a second hose portion 3 having a dividing portion 6 formed by spacing the end faces of each other.
The intake hose consisting of is made to extend into the space 1 formed by a box-shaped outer shell (not shown). Then, in this case, the space 1 is divided into two by the partition plate 2a into an expansion chamber and a resonator chamber which are in communication with the dividing portion 6. Since the resonator chamber is formed in the outer peripheral area of the first hose portion 2 here, the partition plate 2a is formed in the middle of the first hose portion 2 in a flange shape. Since the passage of the first hose portion 2 communicates with the resonator chamber, a small hole 2c is formed on the side of the first hose portion 2 located in the resonator chamber. The first hose portion 2 is connected to an air cleaner (not shown) via an elastic hose 4, and the second hose portion 3 is connected to an engine via an elastic hose 5.

When manufacturing the muffler of this type by molding, since a container having the space 1 inside is formed by blow molding, the first hose portion 2, in the state of FIG. It can be considered that the second hose portion 3 and the partition plate 2a are set (loaded). However, according to such a manufacturing method, the work of loading the first hose portion 2 and the second hose portion 3 to which the partition plate 2a is attached into the mold for blow molding in the state of FIG. 4 is extremely troublesome.

That is, since the positions of the first hose portion 2 and the second hose portion 3 determine the curve of the intake passage, if the positions of the first hose portion 2 and the second hose portion 3 are not properly fixed, the intake air The passage deviates from the shape that smoothly guides intake air, which increases intake resistance and causes unexpected noise. Further, the size of the dividing portion 6 does not have the same width over the entire circumference, so that a good silencing effect cannot be expected.

Therefore, the first hose portion 2 and the second hose portion 3
However, in blow molding, even if the positions of the first hose portion 2 and the second hose portion 3 are restricted in the mold before molding, the position after molding is slightly displaced. Since it is difficult to adjust after molding, it is difficult to adjust the sound deadening device as shown in Fig. 4 by blow molding because of the good intake resistance and sound deadening effect. To do.

It is an object of the present invention to provide a silencer capable of reducing the number of parts and simplifying the manufacturing work without impairing the intake resistance and the noise reducing effect.

[0010]

In order to solve the above-mentioned problems, the invention of claim 1 has a first end that opens into an internal space.
A main body integrally formed by injection molding, which has a cylindrical portion and a mounting hole communicating with the internal space, and defines a part of the internal space, and the internal space is formed by being coupled to the main body. And a second tubular part that is mounted in the mounting hole and has one end facing the one end of the first tubular part and facing the one end of the internal space with a gap. Characterize.

The invention of claim 2 is characterized in that at least one of the main body portion and the closing portion has an internal locking portion for fixing one end portion of the second tubular portion to the internal space. According to a third aspect of the present invention, at least one of the main body portion and the closing portion is an expansion chamber in which the opposing end portions of the first tubular portion and the second tubular portion are housed in the internal space, and the first expansion chamber.
It is characterized in that it has a partition wall portion that divides the other end portion of the tubular portion and an adjacent resonator chamber, and the second tubular portion has a resonator hole that opens into the resonator chamber.

[0012]

According to the invention of claim 1, the first tubular portion integrally formed with the main body portion serves as one of the intake hose portions which are divided into two parts at intervals corresponding to the dividing portion, and the second tubular portion is It will be the other intake hose. The main body portion and the closing portion are connected to each other to form an internal space having the dividing portion as an expansion port of the intake air, and the intake air passing through the first tubular portion and the second tubular portion is defined by the internal space. Vibration components that resonate with the tubular portion or the second tubular portion are attenuated.

In such a silencer, the other end of the second tubular portion is fitted and fixed in the mounting hole so that the one end faces the one end of the first tubular portion with a space therebetween. It can be manufactured by connecting a closing part to. Here, since the first tubular portion is formed integrally with the main body portion, it can be considered that the first tubular portion is fixed in position, and only the second tubular portion is adjusted in position with reference to the first tubular portion. The intake passage with less intake resistance,
That is, a curve formed by the second tubular portion with respect to the first tubular portion can be formed, and the gap between the one end of the first tubular portion and the one end of the second tubular portion can be easily adjusted for good noise reduction effect. Become.

According to the second aspect of the present invention, since the internal locking portion is formed on at least one of the main body portion and the closing portion, one end of the second tubular portion can be positioned and fixed by the internal locking portion. Therefore, the adjustment to the state where the intake resistance is small and the excellent noise reduction effect is exhibited as described above can be performed at the same time when the second tubular portion is mounted. According to the third aspect of the present invention, the partition wall portion that divides the internal space into the resonator chamber and the expansion chamber is also integrally formed with at least one of the main body portion and the closing portion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A silencer according to the present invention will be described in detail below with reference to FIGS. As shown in FIGS. 1 and 2, the silencer of the present embodiment includes a container 10 that forms the outer shell of the silencer, a first tubular portion 13 and a second tubular portion 13 that extend into the internal space of the container 10. The cylindrical portion 14 is mainly configured. Here, the first tubular portion 13 corresponds to the first hose portion 2 (see FIG. 4), the second tubular portion 14 corresponds to the second hose portion 3, and the first tubular portion 13 and the first tubular portion 13 A dividing portion 23 is formed at one end of each of the two tubular portions 14 with a space therebetween. The dividing portion 23 includes a first tubular portion 13 and a second tubular portion 14
The intake passage formed by is communicated with the internal space of the container 10.

However, in this embodiment, the internal space is divided into two by forming the partition wall portion 19 at the intermediate position of the first tubular portion 13 at the intersecting surface with the first tubular portion 13. The side communicating with the part 23 is the expansion chamber 22 and the dividing part 2.
The side not communicating with 3 is the resonator chamber 21. The resonator chamber 21 communicates with the small hole 18 formed in the first tubular portion 13.

As shown in FIG. 3, the container 10 is a combination of a concave main body 11 having a part of the internal space and a similarly concave closing part 12 having the rest of the internal space. The first tubular portion 13 is formed in a double structure with a part of the main body portion 11, one end of the dividing portion 23 is open to the internal space (expansion chamber 22), and the other end is one of the main body portion 11. The elastic hose 15 projects from the side and is connected to the elastic hose 15.
It can be connected to the air cleaner via.

The other end of the second tubular portion 14 is fitted in a mounting opening 17 formed on the other side of the main body portion 11, and one end of the second tubular portion 14 is an internal locking portion projecting from the upper wall of the main body portion 11. It is fixed to 24 by welding or the like. A peripheral end of the mounting port 17 connected to the other end of the second tubular portion 14 is connected to an elastic hose 16 for connecting to the engine. Further, a weir-shaped portion 19A forming a part of the partition wall portion 19 is formed at a substantially intermediate position of the first tubular portion 13, and the closing portion 12 is also weir-shaped corresponding to the weir-shaped portion 19A. The portion 19B is formed.

According to the silencer configured as described above, the intake air passing through the first tubular portion 13 leaks from the small hole 18 into the resonator chamber 21, and the vibration component resonating with the volume of the resonator chamber 21 is attenuated. To be done. Further, the intake air is expanded into the expansion chamber 22 from the dividing portion 23, and the first tubular portion 13 or the second tubular portion 1
The vibration component resonating with 4 is attenuated.

Such a silencer has a main body 11, a closing portion 12, and a second tubular portion 14 as main constituent elements and has a small number of parts, and can be manufactured by simply forming these by molding and assembling them. it can. Specifically, the second tubular portion 14 is formed by blow molding, and the main body portion 11 and the closing portion 12 are formed by injection molding. And the main body 11
The other end of the second tubular portion 14 is fitted into the mounting port 17 of the above, and one end is welded to the internal locking portion 24. After that, the silencer is completed by connecting the closing portion 12 to the main body portion 11 by welding, for example.

Therefore, in the silencer of this embodiment, since the first tubular portion 13 is integrally formed with the main body portion 11, the second tubular portion 14 is positioned with respect to the position-fixed first tubular portion 13. Only by adjusting and fixing to the main body portion 11, the intake passage having a small intake resistance, that is, the second tubular portion 14 with respect to the first tubular portion 13
It is possible to form a curve formed by, and it becomes easy to adjust the size of the dividing portion 23 for a good silencing effect.

In particular, in this embodiment, the internal locking portion 24
Since the position of the second tubular portion 14 can be restricted when it is mounted on the main body portion 11, it is not necessary to adjust to a state in which the intake resistance is small and a good silencing effect is exhibited as described above. As another embodiment, a muffling device having only the expansion chamber 22 without the partition wall portion 19 may be used, but in the present embodiment, the partition wall portion is not required as a separate component, and both the resonator chamber 21 and the expansion chamber 22 are not required. A muffling effect is obtained.

[0023]

As described above, according to the first aspect of the invention, the main body having the mounting opening integrally with the first tubular portion, the second tubular portion fitted into the mounting opening, and the main body. Since it is composed of a closing part which is combined with the part to form an internal space,
It can be manufactured by a simple assembling work in which the tubular part is attached and the closing part is joined to the main body part in which the second tubular part is attached. This can be performed only by determining the position of the second tubular portion with respect to the one tubular portion, and the manufacturing work is extremely simple.

According to the second aspect of the invention, since the internal locking portion is formed on at least one of the main body portion and the closing portion, one end of the second tubular portion can be fixed by the internal locking portion. Therefore, the adjustment to the state in which the intake resistance is small and the excellent sound deadening effect is exhibited as described above can be performed at the same time when the second tubular portion is mounted. According to the invention of claim 3, since the partition wall portion is integrated with at least one of the main body portion and the closing portion, a resonator chamber that silences by the resonance principle and an expansion chamber that silences by the expansion principle are provided in parallel. However, it does not increase the number of parts.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a silencer according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an exploded perspective view of the silencer of FIG.

FIG. 4 is a perspective view showing an original form of the present muffling device.

[Explanation of symbols]

Reference numeral 11 is a main body portion, 12 is a closing portion, 13 is a first tubular portion, 14
Is a second cylindrical portion, 17 is a mounting opening, 18 is a small hole, 19 is a partition wall portion, 21 is a resonator chamber, 22 is an expansion chamber, 23 is a dividing portion, and 24 is an internal locking portion.

Claims (3)

[Claims] 1. A main body integrally formed by injection molding, having a first cylindrical portion having one end open to the internal space and a mounting hole communicating with the internal space, and partitioning a part of the internal space. A closing portion formed by injection molding to be coupled to the main body portion to form the internal space; and one end attached to the mounting hole and spaced from the one end of the first tubular portion in the internal space. And a second cylindrical portion facing each other, and a silencer. 2. The silencer according to claim 1, wherein at least one of the main body portion and the closing portion has an internal locking portion that fixes one end portion of the second tubular portion to the internal space. apparatus. 3. At least one of the main body portion and the closing portion, and an expansion chamber for accommodating the opposite ends of the first tubular portion and the second tubular portion in the internal space, and the first tubular portion. 2. The silencer according to claim 1, further comprising a partition wall portion that divides the other end portion of the portion into an adjacent resonator chamber, and the second tubular portion has a resonator hole that opens into the resonator chamber.