JPH0834072A - Air cleaner fitted with resonator, method and mold for producing the same - Google Patents

Abstract

PURPOSE:To hold the flexibility of a bellows part by preventing the formation of burr in the bellows part and to obtain an integrated molded product of an air cleaner hose and a resonator to reduce cost. CONSTITUTION:At least both end fitting parts 32, 33 of an air cleaner hose 3 and the bellows part 34 provided to a part of the hose 3 are formed of a resin material low in swell ratio by blow molding and the straight tube part 31 extended from the bellows part 34 of the air cleaner hose 3 and the resonator 2 being the hollow member integrally molded so as to be connected to the straight tube part 31 are formed of a resin material high in swell ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner hose with a resonator in which a resonator, which is a silencer, is integrated, a method for manufacturing the same, and a mold structure for manufacturing the same.

[0002]

2. Description of the Related Art In the secondary hose for engine intake,
There is a case where a muffling device such as a resonator that applies the Helmholtz resonance principle is mounted to muffle the intake sound. In such a case, conventionally, a mounting structure in which a resin resonator 2 is fitted to a rubber or resin air cleaner hose 3 has been generally used (FIG. 11).

[0003]

However, since the air cleaner hose 3 and the resonator 2 are separate bodies, a hose clamp 91, a reinforcing collar 92 for preventing creep deformation, etc. are required at the fitting portion, and further, Had to perform these assembly work. For this reason, there has been an attempt to integrally blow-mold the resonator 2 and the air cleaner hose 3, but a parison having a large diameter is extruded, and burr appears on the bellows portion 34 in the conventional total burr system. as a result,
There was a defect that the wall thickness of the parting part of the bellows part 34 was increased and the bending in the parting direction was deteriorated.

The present invention solves the above-mentioned problems. By keeping the accordion portion free from burrs and maintaining the flexibility of the accordion portion, and further by obtaining an integrally molded product of the air cleaner hose and the resonator, the cost is reduced. An air cleaner hose with a resonator, a method for manufacturing the same, and a mold structure for manufacturing the same are provided.

[0005]

An air cleaner hose with a resonator according to the first aspect of the present invention is manufactured by blow molding, and a bellows portion provided at least at both end fitting portions of the air cleaner hose and a part thereof has a small swell ratio. On the other hand, the straight pipe part of the air cleaner hose extended to the bellows part and the hollow resonator formed integrally with and connected to the straight pipe part are formed of a resin material having a large swell ratio. It is characterized in that it is formed by. here,
The "swell ratio" refers to the ratio of the diameter D [mmφ] of the actually extruded parison to the diameter d [mmφ] of the die for extruding the parison (FIG. 3). "The resin material having a small swell ratio" means that the swell ratio is 1.0 to
The resin material of 1.5 is a material such as a thermoplastic polyolefin elastomer (TPO) or low density polyethylene (LDPE). The “resin material having a large swell ratio value” refers to a resin material having a swell ratio value of more than 1.5, and examples thereof include polypropylene (PP) and high-density polyethylene (HDPE).

The mold structure of the air cleaner hose with a resonator according to the second aspect of the present invention is a mold for blow molding of the air cleaner hose with a resonator according to the first aspect of the invention, in which the resonator and the straight pipe portion connected to the resonator are integrated. It is characterized in that a mold part for blow molding is divided from other mold parts and constitutes a mold slide part which is slidable in the mold splitting direction by a driving means.

In the method for manufacturing an air cleaner hose with a resonator according to the third aspect of the present invention, the die of the second aspect is used, and the die slide part is slid and retracted from another die part, and then the die is removed from the die. A parison of resin material with a small swell ratio is extruded, and while moving the mold, this parison is put into the cavity related to the bellows part from the fitting part of one end, and after the parison passes through the bellows part, the swell ratio becomes large. Switch to the parison of resin material, push the parison onto the cavity of the mold slide part, then switch to the parison of resin material with a small swell ratio again immediately before entering the fitting part at the other end, and then to the fitting part at the other end. After extruding the parison into the cavity, the other mold parts are closed, and then the mold slide part is advanced and closed at the same time as the air blowing or following the air blowing. Characterized in that it. “While moving the mold” is sufficient if the mold can be moved relative to the parison, and includes the case where the parison side moves.

[0008]

According to the air cleaner hose with a resonator, the method for manufacturing the same, and the mold structure for manufacturing the same according to the present invention, the resonator and the straight pipe portion to which the resonator is connected are parisons made of a resin material having a large swell ratio. On the other hand, the fitting parts at both ends and the bellows part are made of a parison made of a resin material with a small swell ratio, so while using the same die, the resonator part secures a large diameter parison and the bellows part etc. Can be equipped with a small diameter parison without burr. Further, when the mold part integrally blow-molding the resonator part and the straight pipe part to which the resonator part is connected is separated from the other mold parts as a mold slide part and made slidable in the mold splitting direction, first the resonator part is formed. When disposing the parison on a part, the mold slide portion can be retracted so that the parison can be floated in the air. Therefore, it is possible to prevent the parison from hitting and flattening the mold. Then, after closing the other mold parts, the parison is shaped into a desired shape by closing the mold slide part at the same time as or following the air blowing, and the air cleaner hose with a resonator is formed. You will be able to build.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.
1 to 10 show an air cleaner hose with a resonator according to the present invention, a method for manufacturing the same, and a mold structure for manufacturing the same. FIG. 1 shows a mold 1 for blow molding which has a cavity in the shape of an air cleaner hose with a resonator as a molded product, and here only a lower mold 1a is shown.
The mold structure is a resonator 2 and a straight pipe portion 3 to which the resonator 2 is connected.
1 is a split mold of a mold part 11 for integrally blow molding and another mold part 12, and the mold part 11 can be slid in the mold splitting direction by using a known air driving means (not shown). The mold slide section 11a is a simple mold. Incidentally, hydraulic pressure or the like can be used as the driving means. Only the mold parts 12, 12 are fixed to the base 1c.

The mold slide portion 11a is formed by forming a large diameter parison 6 in the cavity 5a corresponding to the resonator 2 and the cavity 5b of the straight pipe portion 31 to which the cavity 5a is connected.
Although a is provided (described later), this is to prevent the parison 6a from being flattened and flattened due to contact with the mold 1 when the parison is provided. When the mold is closed, the mold slide part 11
By closing a later than the mold part 12, the parison 6a
Is expanded to form the resonator 2 and the straight pipe portion 31 integrally.

Reference numerals 5c and 5d denote fitting portions 32 and 3 at both ends.
The reference numeral 5e is a cavity corresponding to 3 and the reference numeral 5e is a cavity corresponding to the bellows portion 34. The outer diameter of the parison 6 including the tube following this is preferably small, and is provided in the mold portion 12. Biting protrusions 112 are formed on the periphery of the cavities 5a and 5b. This is because the unnecessary part of the parison 6 that becomes the burr f when the mold is closed is cut off and the necessary edges are fused together. Reference numeral 13 is the upper mold 1b when the mold is closed.
The engagement pin with is shown. The lower die 1a includes a moving mechanism (not shown) that can move freely in a two-dimensional horizontal direction with a predetermined distance downward from the die 7.

Next, a method of manufacturing an air cleaner hose with a resonator using the mold 1 will be described. First,
The mold slide portion 11a is slid back from the position of the other mold portion 12 and moved to the vicinity of the base 1c (FIG. 1). Next, a resin material that is soft from the die 7 and has a small swell ratio, such as a polyolefin thermoplastic elastomer (TPO) (AES (Advanced Elastomer Syst
Made by ems), product name: "Santoprene" product model number: 1
01-80, 101-87, 101-75) parison 6b is extruded in a molten state. Then, the lower mold 1a is moved by the moving mechanism to move the parison 6b to the fitting portion 3 of one terminal.
It is arranged from the cavity 5c of No. 2 into the cavity 5e of the bellows 34 (FIG. 2). The soft material is
This is because the bellows portion 34 has flexibility. Parison 6
When arranging b, be careful not to protrude outside the cavities 5c and 5e. Here, when the molten resin is extruded from the die 7, the outer diameter D of the parison 6b extruded by the ballast effect is generally larger than the diameter d of the die 7 (FIG. 3). However, the swell ratio of the thermoplastic polyolefin-based elastomer (TPO) used was about 1.
Since it is 1, it is not so noticeable.

At the stage where the parison 6b has been installed in the cavity 5e of the bellows portion 34, the parison 6 is next switched to a resin material having a large swell ratio. Along with this, the parison 6a having a large diameter corresponding to the resonator 2 and the straight pipe portion 31 is extruded from the die 7 (FIG. 4). Since the resonator 2 needs to have rigidity, the block copolymer polypropylene (PP) as a resin material (manufactured by Idemitsu Petrochemical Co., Ltd., product model number: E-250G, or Showa Denko KK, product model number: S)
K711) is used. For switching the resin material, a well-known blow molding two-layer head 8 was used (FIG. 5). The inner layer extruder 81, which has supplied the thermoplastic polyolefin-based elastomer (TPO), is stopped and the outer layer extruder 82 is operated, and the block copolymer polypropylene (PP) is poured out. Then, the lower mold 1a is moved to the parison 6
a is placed on the cavities 5a and 5b (FIG. 4). Since the mold slide portion 11a is retracted, the parison 6a is suspended above the cavities 5a and 5b. The parison 6a is larger than the cavity shape,
When closing the die slide portion 11a, the parison (burr f
It will be divided).

Then, immediately after the disposition of the parison 6a on the die slide portion 11a is completed and immediately before entering the cavity 5d of the fitting portion 33 at the other end, the resin material of the parison 6 is again made of a polyolefin resin having a small original swell ratio. Switch to thermoplastic elastomer (TPO). With this switching, the parison 6b is changed to a parison 6b having a small diameter, and the parison 6b corresponds to the cavity 5d corresponding to the fitting portion 33 at the other end.
It will be distributed inside (Fig. 6). The parison 6b is housed in the cavity 5d so that it does not stick out from the cavity 5d.

By the way, the parison 6 formed by the above two switching operations has a shape in which the corresponding portions of the resonator 2 and the straight pipe portion 31 swell, but a material having a small swell ratio, here a thermoplastic polyolefin elastomer (TPO). )When,
Regarding the cross-sectional structure of a material having a large swell ratio, here a block copolymer polypropylene (PP), either (a) or (b) of FIG. 7 may be used. 7A shows a complete switching structure, and FIG. 7B shows the entire parison 6 having a two-layer structure, in which the swell ratio is changed by changing the thickness of each.

When the parison 6 has been placed on the lower die 1a, the die portion 12 is closed. Then, at the same time as the air blowing from the air blowing nozzle 19 attached to the mold,
Alternatively, after a slight delay, the mold slide portion 11a is slid forward and closed, and blow molding is performed (FIG. 8). By closing the mold part 12, the parison 6 is placed in the cavity 5.
b is included, and the mold slide portion 11
Along with the closed mold of a, a cavity-shaped body corresponding to the resonator 2 and the straight pipe portion 31 is formed in the mold and the cutting protrusion 11 is formed.
A burr f is formed on the outer side of the two with the two being sandwiched. By blowing air into the inside of the parison 6, the parison 6 is largely swollen outwardly and shaped to become an air cleaner hose A with a resonator. The air is blown by the die mounting blow nozzle 19. Reference numeral 14 indicates a clamp for holding the parison.

When the molded body is cooled, removed from the mold, and then taken out, a blow-molded product is obtained in which the resonator 2 and the straight pipe portion 31 are integrated with each other and a burr f is formed around them (FIG. 9). ), The burr f and the waste bag g are removed to form the desired air cleaner hose A with a resonator.

In the air cleaner hose A with a resonator thus completed, not only the fitting parts 32 and 33 at both ends of the air cleaner hose 3 but also the bellows part 34 have a small swell ratio of a polyolefin thermoplastic elastomer (T).
PO) in cavities 5c, 5d, 5e and parison 6b.
Since it is manufactured so as to accommodate the burr, burr f does not occur in such a portion even by blow molding (see FIGS. 9 and 1).
0). Further, since the thermoplastic polyolefin-based elastomer (TPO) is a soft resin, the bellows portion 34 has flexibility and flexibility. On the other hand, in the straight pipe portion 31 of the air cleaner hose 3 extended to the bellows portion 34 and the resonator 2 portion integrally connected to the straight pipe portion 31, block copolymer polypropylene (PP) having a large swell ratio is used, and the parison 6 is used. Since the caliber of the mold becomes large, the parison 6a is crushed and expanded by closing the mold slide part 11a, and the hollow resonator 2 and the straight pipe part 31 communicate with each other by the subsequent blow molding. It has become the desired product of 3 integrated. Since the resonator 2 is made of hard resin, it has a predetermined rigidity.

The air cleaner hose A with a resonator constructed as described above is an integrally molded product of the air cleaner hose 3 and the resonator 2, and not only the hose clamp and the creep deformation reinforcing ring which have been conventionally required are not required.
It was also released from its installation work, resulting in low cost and labor saving. Further, by combining materials having different swell ratios and forming a mold structure in which the burr f does not appear in the bellows portion 34 and the fitting portions 32 and 33, the flexibility of the bellows portion 34 and the fitting portion 3 can be improved.
The sealing function of Nos. 2 and 33 is no longer lost.
In addition, the resonator 2 portion is made of a hard material having a large swell ratio, and the bellows portion 34 is made of a soft material having a small swell ratio.
While the rigidity required for the above can be secured, the bellows portion 34 can be provided with flexibility.

The present invention is not limited to those shown in the above embodiment, but can be variously modified within the scope of the present invention depending on the purpose and application. In the embodiment, the lower mold 1a is moved to dispose the parison 6 in the cavity 5. However, the lower mold 1a may be fixed and the head of the parison 6 may be moved.
The resonator 2 may be used not only to reduce intake noise but also to reduce exhaust noise.

[0021]

As described above, the air cleaner hose with a resonator, the method for manufacturing the same, and the mold structure for manufacturing the same according to the present invention provide an integrally molded product of the resonator and the air cleaner hose while ensuring the flexibility of the bellows. Because
It has excellent effects such as reducing the number of parts, eliminating assembly work, and contributing to cost reduction of products.

[Brief description of drawings]

FIG. 1 is a perspective view of a lower mold for manufacturing an air cleaner hose with a resonator shown in an embodiment.

FIG. 2 is a perspective view showing a state in which a parison is arranged in a cavity related to a bellows portion.

FIG. 3 is a cross-sectional view showing a relationship between a die and a parison.

FIG. 4 is a perspective view showing a state in which a parison is arranged in a cavity related to a resonator.

FIG. 5 is a sectional view of a two-layer head for blow molding.

FIG. 6 is a perspective view showing a state in which the parison has been installed in the cavity of the lower mold.

FIG. 7 is a sectional structural view of a parison.

FIG. 8 is a perspective view of a closed mold state.

FIG. 9 is a perspective view of a blow-molded product taken out from the mold.

FIG. 10 is a perspective view of an air cleaner hose with a resonator.

FIG. 11 is an explanatory sectional view showing a fitted state of a conventional resonator and an air cleaner hose.

[Explanation of symbols]

 1 Mold 11 Mold Part 11a Mold Slide Part 12 Mold Part 2 Resonator 3 Air Cleaner Hose 31 Straight Pipe Part 32 Fitting Part 33 Fitting Part 34 Bellows Part 5 Cavity 6 Parison 7 Dice

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F01N 1/02 F02M 35/12 B // B29K 21:00 101: 00

Claims (3)

[Claims] 1. An air cleaner hose is formed by blow molding, and at least both fitting portions of the air cleaner hose and a bellows portion provided at a part thereof are formed of a resin material having a small swell ratio, and extend to the bellows portion. An air cleaner hose with a resonator, wherein a straight pipe portion of an air cleaner hose and a hollow resonator integrally connected to the straight pipe portion are formed of a resin material having a large swell ratio. 2. A straight pipe portion of an air cleaner hose extending to the bellows portion, while at least both end fitting portions of the air cleaner hose and a bellows portion provided at a part thereof are made of a resin material having a small swell ratio. A blow molding mold for an air cleaner hose with a resonator, in which a hollow body resonator connected to the straight pipe part and integrally molded is formed of a resin material having a large swell ratio. An air cleaner with a resonator in which a die portion for integrally blow-molding a straight pipe portion connected to the resonator constitutes a die slide portion which is divided from other die portions and is slidable in a die split direction by a driving means. Hose mold structure. 3. A mold slide part for integrally blow-molding a resonator and a straight pipe part connected to the resonator, the mold part being divided from other mold parts and being slidable in a mold splitting direction by a driving means. Using the mold of the air cleaner hose with resonator, the mold slide part is slid and retracted from the other mold parts, and then the parison of the resin material with a small swell ratio is extruded from the die, While moving the mold, the parison is housed from the fitting part of one end into the cavity related to the bellows part, and after the parison passes through the bellows part, the parison is switched to the parison of the resin material having a large swell ratio, and the mold slide part Extrude the parison on the cavity of, then switch to the parison of resin material with a small swell ratio again immediately before entering the fitting part at the other end, and at the fitting part at the other end. After the parison is extruded into the cavity, the other mold parts are closed, and then the mold slide part is advanced at the same time as the air blowing or following the air blowing to close the mold. A method of manufacturing an air cleaner hose with a resonator.