JP3374632B2 - Air cleaner hose and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air cleaner hose used in an intake system of an engine and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as an air cleaner hose for an automobile engine, as described in Japanese Patent Laid-Open No. 4-37522, a hose body integrally joined with a resonator for muting intake noise. Are known. FIG. 8 is a perspective view showing a conventional air cleaner hose 100,
9 is an enlarged cross-sectional view taken along the line AA of FIG. The air cleaner hose 100 includes a hose body 110 and a resonator 120. The hose body 110 is formed by a blow molding method and has an intake passage 112 for introducing air into an engine (not shown). Further, the resonator 120 is a box body having a muffling chamber 122, and includes a resonator body 124 integrally joined to the hose body 110 and a lid 126. A communication pipe 128 that communicates with the hose body 110 is formed in the resonator body 124 of the resonator 120. The communication passage 128 a of the communication pipe 128 has a hose body 110.
The intake passage 112 of the hose body 110 and the muffling chamber 122 are communicated with each other through a through hole 114 formed in the hose body 110.

The blow molding process for manufacturing the air cleaner hose 100 is as follows. First, the resonator body 124 and the lid 126 are molded by injection molding in advance, and the resonator body 124 is set in the cavity of the lower mold. Then, by pushing the parison with an extruder, the parison is set so as to be placed in the cavity and on the resonator body 124, and after the mold is clamped by the upper mold, air is pumped into the hose body 110. And the resonator body 124 are integrally joined.

In the blow molding method described above, the communication pipe 128
Since the communication passage 128a is sealed by the hose body 110, the through hole 114 is formed in the side wall of the hose body 110 after being released from the mold by a tool such as a drill. At this time, a tool such as a drill is inserted through the opening 129 of the resonator body 124. This opening 129 is
It is provided for the insertion of tools such as a drill and for taking out the chips cut during drilling.
It is sealed with a lid 126 so as to be 22.

[0005]

In the above conventional air cleaner hose 100, the through hole 114 is provided in the hose body 110.
Since it is necessary to form the communication pipe 128, the position of the communication pipe 128 is limited to a position where a punching operation can be performed from the opening 129 of the resonator body 124. Therefore, even if the resonator 120 is compactly joined to the hose body 110, there is a problem in that the degree of freedom in arranging the resonator 120 is limited due to the position of the communication pipe 128. Further, the position of the communication pipe 128 is an important factor for ensuring the sound deadening characteristic, and there is also a problem that it cannot be optimally arranged in relation to the position of the opening 129.

Further, in order to obtain the resonance frequency, the resonator 120 is required to set the distance L1 from the inner wall 126a facing the communication outlet 128b of the communication pipe 128 to about twice or more the diameter D1 of the communication outlet 128b. Is preferred,
The resonator 120 itself becomes large, which is disadvantageous in mounting the vehicle.

The present invention solves the above-mentioned problems of the prior art. The shape of the resonator integrally joined to the hose body can be made compact, the degree of freedom in design is increased, and the sound absorbing characteristic is further improved. An object is to provide an air cleaner hose and a manufacturing method thereof.

[0008]

Means for Solving the Problem and Its Action / Effect The first invention made to solve the above problem is to provide a hose body having an intake passage for introducing air into an engine, and a hose body integrally with the hose body. An air cleaner hose provided with a resonator that is joined and has a muffling chamber for muffling the intake air in the intake passage, wherein the hose body is bent in a substantially V shape between the inlet and the outlet of the intake passage. Section, a facing wall facing the inlet or the outlet in a straight line direction, the facing wall and the inlet or
And a through hole formed along a straight axis passing through the outlet, wherein the resonator is formed on the hose connecting wall and a hose connecting wall for integrally connecting the hose body.
A resonator body, which is formed on the hose coupling wall in an inclined manner and has a communication pipe that communicates the through hole and the sound deadening chamber with a communication passage, and is joined to the resonator body to form the sound deadening chamber together with the resonator body. And a lid.

The air cleaner hose according to the present invention is
It introduces air from the inlet of the intake passage of the hose body and guides it to the engine, and is constructed by integrally joining a resonator with the hose body in order to eliminate the sound at the time of intake. The resonator is provided with a muffling chamber, and this muffling chamber is connected to the intake passage via the communication passage of the communication pipe and eliminates air noise flowing through the intake passage.

The hose body has a bent portion bent into a substantially V shape, and a through hole communicating with the communication pipe is formed at a position of the bent portion facing the inlet or outlet of the intake passage. . That is, the through hole is a facing wall that is located at a position facing the inlet or the outlet in a straight line direction , and
Are arranged along a straight line passing through the outlet, so that the hose body can be integrally joined to the resonator body and then drilled through a tool such as a drill through the inlet or the outlet.

Therefore, in order to form the through hole communicating with the communicating tube, unlike the conventional technique, the communicating tube can be arranged independently of the opening of the resonator body, so that the external shape of the resonator can be freely set. This is advantageous for mounting on a vehicle. For example, the opening of the resonator body can be provided at a position at a predetermined angle in the circumferential direction from the direction in which the communication pipe is arranged with the axis of the hose body as the center.

Further, the hose body is formed in a substantially V shape, and the connecting pipe is arranged along the substantially straight axis from the inlet or the outlet of the hose body and is arranged so as to be inclined with respect to the wall surface of the resonator body facing the hose body. By doing so, it is possible to obtain a desired muffling characteristic by separating the distance between the communication tube and the wall surface of the resonator body facing the communication tube by a predetermined distance or more, and it is possible to make a small resonator.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below in order to further clarify the configuration and operation of the present invention described above.

FIG. 1 is a perspective view showing an air cleaner hose 10 used in an intake system of an engine, and FIG. 2 is a B-of FIG.
FIG. 3 is a sectional view taken along line B, and FIG. 3 is an enlarged sectional view taken along line CC of FIG. In these figures, an air cleaner hose 10 includes a hose body 20 having an intake passage 21 for introducing air into an engine, and a resonator 30 having a muffling chamber 31 for silencing the intake air in the intake passage 21.
And are equipped with.

The hose body 20 is provided with a bent portion 22 bent in a substantially V shape between the inlet 21a and the outlet 21b of the intake passage 21, and the inlet 21a is bent with respect to the bent portion 22.
The hose upstream part 23, the outlet 21b side is the hose downstream part 2
It is 4.

On the other hand, the resonator 30 is provided with a resonator body 32 and a lid 34 which forms a muffling chamber 31 together with the resonator body 32. Resonator body 32
Is a hose coupling wall 36 that joins the hose body 20 together.
Is equipped with. This hose coupling wall 36 is used for the hose body 2
It is formed in the shape of a groove having a semicircular cross section in order to hold 0. In addition, the hose body 20 is the resonator body 32.
A communication pipe 38 is formed at a portion to be joined to the bent portion 22. The communication pipe 38 has a communication passage 38a,
One communication outlet 38b communicates with the muffling chamber 31. The hole diameter D2 of the communication outlet 38b of the communication pipe 38 is
In relation to the distance L2 between b and the inner wall 32a of the resonator body 32, D2 <L2 / 2 is set. When the hole diameter D2 and the distance L2 have the above-described relationship, the muffling chamber 31
, The resonance frequency is obtained, and a desired silencing characteristic can be obtained. The other opening of the communication passage 38 a of the communication pipe 38 communicates with the through hole 26 formed in the hose body 20. The through hole 26 is formed in the facing wall 27 at a position facing the outlet 21b side of the hose body 20 in the linear direction.

Further, the resonator body 32 has an opening 39 which is sealed by the lid 34. The opening 39 is arranged downward in the drawing, which is a direction perpendicular to the protruding direction of the communication pipe 38, and is sealed by heat welding at the peripheral edge of the lid 34.

The air cleaner hose 10 introduces air from the inlet 21a of the intake passage 21 of the hose body 20 and guides it to the engine, and when the air is sucked in by the muffling chamber 31 communicated through the communication passage 38a of the communication pipe 38. Turn off the sound.

Next, a process of manufacturing the air cleaner hose 10 will be described. First, the resonator body 32 and the lid 34 are preformed by injection molding. The resonator main body 32 and the lid 34 are made of the same resin material in order to enhance mutual bondability, and for example, an olefin-based material such as polypropylene (PP) is used.

Next, the hose body 20 is molded by the blow molding method using the resonator body 32 as an insert member. FIG. 4 is a perspective view illustrating a state in which the parison P is being pushed out, and FIGS. 5 and 6 are views showing a blow molding process in a portion corresponding to FIGS. 2 and 3. The blow mold 40 includes a lower mold 41 and an upper mold 42. Lower mold 4
1, a lower mold cavity 41a is formed. The lower mold cavity 41a includes a setting portion 41b for setting the resonator main body 32 and a hose forming portion 41c for forming the hose main body 20. Hose forming part 41c
Is formed in a bent groove shape so as to form the substantially V-shaped hose body 20, and a part of the groove is provided over the hose coupling wall 36 of the resonator body 32. On the other hand, the upper mold 42 includes an upper mold cavity 42a for forming the hose body 20 together with the lower mold cavity 41a.

In the blow molding process using the blow mold 40, first, the resonator body 32 is set in the setting portion 41b of the lower mold cavity 41a of the lower mold 41. Then, push out the parison P from the nozzle 51 of the extruder,
The parison P is placed on the hose forming portion 41c and the hose coupling wall 36 on the resonator body 32. At this time, the nozzle 51 of the extruder is made to follow the shape of the hose forming portion 41c, so that the parison P is placed in a bent state on the hose forming portion 41c.

Then, after the upper mold 42 is clamped to the lower mold 41, gas is blown into the parison P. As a result, the parison P follows the shape of the hose forming portion 41c and is heat-welded to the hose coupling wall 36 of the resonator body 32 to form the hose body 20. And the resonator body 3
After the hose body 20 integrated with 2 is cooled, the hose body 20 is released from the mold, and the end surface treatment such as cutting the hose body 20 is performed.

Next, as shown in FIG. 7, the through hole 26 is formed in the opposing wall 27 of the hose body 20 by the drill 52 of the boring device.
To form. That is, the drill 52 of the boring device is inserted from the outlet 21b of the hose body 20 and the communication pipe 38
The through hole 26 is formed in a state of being aligned with the communication passage 38a. At this time, the inlet side of the communication passage 38a of the communication pipe 38 is sealed to prevent resin leakage during blow molding (see FIG. 5), but this is also formed at the same time as the through hole 26.
The chips generated when the through holes 26 are formed are discharged from the opening 39 of the resonator body 32. Thereafter, the silencer chamber 31 is formed by joining the lid 34 to the end of the opening 39 of the resonator body 32 by heat or vibration welding. Then, the air cleaner hose 10 is completed by performing post-processing such as deburring.

In the air cleaner hose 10 according to the above-described embodiment, since the through hole 26 communicating with the communication pipe 38 is formed by the drill 52 through the outlet 21b of the hose body 20, the communication pipe 38 is arranged. It becomes independent of the opening 39 of the resonator body 32. Therefore, the communication pipe 38 expands the degree of freedom in designing with emphasis on the shape and the silencing characteristics without considering the position of the opening 39 of the resonator 30, and for example,
The thickness T1 shown in FIG. 1 can be reduced.

The position of the communication pipe 38 is determined by the hose body 2
Since it is provided on the facing wall 27 facing the outlet 21b of 0 and is not restricted by the position of the opening 39, it is possible to achieve an optimum arrangement having excellent silencing characteristics.

Further, the communication pipe 38 is connected to the hose downstream portion 24.
Since it is arranged on a straight line along with and is arranged obliquely with respect to the inner wall 32a, as compared with the conventional technique in which it is arranged perpendicularly to the wall surface of the resonator, as shown in FIG. By shortening the distance L3 to the resonator 30, the resonator 30 itself can be downsized, which is advantageous in mounting the vehicle.

The present invention is not limited to the above-described embodiment, but can be carried out in various modes without departing from the scope of the invention, and the following modifications can be made.

(1) In the above embodiment, the intake passage 2
Although the through hole 26 that communicates with the communication pipe 38 is formed from the outlet 21b side of No. 1, when the communication pipe is in a position facing the inlet side of the intake passage in a linear direction due to the positional relationship between the hose body and the resonator, Perforation work may be performed from the side.

(2) In the above embodiment, the resonator is arranged so as to sandwich the hose body. However, the shape and arrangement of the resonator are not particularly limited as long as there is no hindrance to the work of forming the through hole communicating with the communicating pipe. Instead, for example, it may be arranged only on one side of the hose body.

[Brief description of drawings]

FIG. 1 is a perspective view showing an air cleaner hose 10 according to an embodiment of the present invention.

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

3 is a cross-sectional view taken along the line CC of FIG. 1 and enlarged.

FIG. 4 is an explanatory view illustrating a blow molding method for manufacturing the air cleaner hose 10.

FIG. 5 is an air cleaner hose 10 shown corresponding to FIG.
Explanatory drawing explaining the manufacturing process of.

FIG. 6 is an air cleaner hose 10 shown corresponding to FIG.
Explanatory drawing explaining the manufacturing process of.

FIG. 7 is an explanatory view illustrating a process of forming a through hole 26 of the air cleaner hose 10.

FIG. 8 is a perspective view showing a conventional air cleaner hose 100.

9 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

10 ... Air cleaner hose 20 ... Hose body 21 ... Intake passage 21a ... Entrance 21b ... Exit 22 ... Bending part 23 ... upstream of hose 24 ... Downstream of hose 26 ... Through hole 27 ... Opposing wall 30 ... Resonator 31 ... Silencer room 32 ... Resonator body 32a ... inner wall 34 ... Lid 36 ... Hose connecting wall 38 ... Communication pipe 38a ... communication passage 38b ... communication outlet 39 ... Opening 40 ... Blow mold 41 ... Lower mold 41a ... Lower mold cavity 41b ... Set section 41c ... Hose forming part 42 ... Upper mold 42a ... Upper mold cavity 51 ... Nozzle 52 ... drill P ... Parison

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-4-37522 (JP, A) JP-A-7-217511 (JP, A) JP-A-5-256219 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B29C 49/20 F02M 35/12

Claims (4)

(57) [Claims] 1. An air cleaner comprising: a hose body having an intake passage for introducing air into an engine; and a resonator having a silencer chamber integrally joined to the hose body for silencing intake air in the intake passage. In the hose, the hose body includes a bent portion that is bent in a substantially V shape between an inlet or an outlet of an intake passage, a facing wall that faces the inlet or the outlet in a linear direction, and the facing wall. so
And a through hole bored along a straight axis passing through the inlet or the outlet , the resonator is formed on the hose coupling wall and the hose coupling wall that integrally joins the hose body. Ho
A resonator main body having a communication pipe that is formed to be inclined to the connecting wall and that has the through hole and the muffling chamber communicating with each other through a communication passage; and a resonator body that is joined to the resonator body and forms the muffling chamber together with the resonator body. An air cleaner hose including a lid. 2. The air cleaner hose according to claim 1, wherein the communication pipe is inclined with respect to the wall surface of the resonator body. 3. The resonator body is provided with an opening at a position at a predetermined angle in the circumferential direction from the direction in which the communication pipe is arranged, with the axis of the hose body as the center, and the opening is closed with a lid. The air cleaner hose according to claim 1 or 2. 4. An air cleaner hose in which a resonator body and a lid body for forming the resonator according to any one of claims 1 to 3 are prepared, and the hose body is integrally joined to the resonator body by blow molding. In the manufacturing method, a first mold having a first cavity for setting the resonator body and a second mold having a second cavity for clamping the hose body together with the first mold are provided. Using the step of setting the resonator body in the first cavity of the first mold, the step of placing at least the parison for forming the hose body on the hose coupling wall of the resonator body, the first mold and the first mold Blow molding the hose body by clamping the mold and blowing gas into the parison, and after the blow molding, the inlet of the intake passage or A facing wall of the hose body and the top fill so as to communicate with the communicating pipe from the mouth
Insert a tool through the mouth or outlet to
Forming a through hole along a straight line passing through , and closing the opening of the resonator body with a lid to remove the eraser.
A method of manufacturing an air cleaner hose , comprising: a step of forming a sound chamber .