JPH06264838A - Hose with resonator - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost, prevent a resonator main body from being removed from a hose, and prevent the reduction of airtightness. CONSTITUTION:A hose 1 capable of feeding the intake air to an internal combustion engine and resonators 8, 11 for reducing the prescribed frequency component of the intake sound propagated in the hose 1 via the resonance action are integrally molded. Members such as clamps required when the hose 1 and the resonators 8, 11 are separately provided are not required in this constitution, and the resonators 8, 11 are not removed from the hose 1. The reduction of the airtightness of boundary sections between the hose 1 and the resonators 8, 11 is prevented, and the deficient intake feed due to the reduction of airtightness is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose with a resonator which is used as, for example, an intake pipe for an internal combustion engine, and which has a resonator for reducing a predetermined frequency component of a propagation sound propagating in the intake pipe.

[0002]

2. Description of the Related Art Conventionally, for example, a resonator shown in FIG. 6 has been proposed as a resonator for reducing intake noise of an internal combustion engine (noise generated by pulsation generated in the intake stroke of the internal combustion engine). Specifically, an intake pipe 20 is connected to the internal combustion engine. Connection pipes 22 and 23 are provided on the intake pipe 20 in a protruding manner, and first and second resonators 24 and 25 are attached to the connection pipes 22 and 23. Both resonators 24,
25 is an intake pipe 2 by applying the Helmholtz resonance principle.
It is a muffler (resonator) for reducing a predetermined frequency component of the propagation sound propagating through the flow path 21 in 0.

The first resonator 24 comprises a body case 26 having a predetermined internal volume and a resonance tube 27. A tubular collar 28 is fitted in the resonance pipe 27, and in this state, the resonance pipe 27 is fitted in the connection pipe 22. An annular clamp 29 is provided on the outer circumference of the connecting pipe 22, and a screw 30 is screwed into the clamp 29. Then, by tightening this screw 30, the clamp 2
9 is fastened in the inner peripheral direction of the connecting pipe 22, and the connecting pipe 22 and the resonance pipe 27 are fastened to the collar 28.

On the other hand, the second resonator 25 is formed in a J-shaped cross section having a predetermined internal volume, and its tip is closed. A cylindrical collar 31 is provided in the base end of the second resonator 25.
The second resonator 25 is fitted in the connecting pipe 23 in this state. An annular clamp 32 is provided on the outer circumference of the connecting pipe 23, and a screw 33 is screwed into the clamp 32. Then, by tightening the screw 33, the clamp 32 is tightened in the inner peripheral direction of the connecting pipe 23, and the connecting pipe 23 and the second resonator 25 are tightened to the collar 31.

[0005]

However, in the above-mentioned prior art, the first and second resonators 24 and 25 are connected to the intake pipe 2.
In order to assemble to 0, clamps 29, 32 with screws and collars 28, 31 are required. Further, the work of inserting the collars 28 and 31 into the connecting pipes 22 and 23, the work of fitting the resonance pipe 27 and the second resonator 25 into the connecting pipes 22 and 23, and the work of tightening the clamps 29 and 32 are troublesome, and many Assembly work is required. As a result, there are problems that the number of steps required for the assembling work increases and the manufacturing cost increases.

Further, the first and second resonators 24, 25
Is kept airtight to the outside by the tightening force of the clamps 29 and 32. Therefore, the clamp 2
When the tightening of 9 and 32 is insufficient, the first and second resonators 24 and 25 may be disengaged from the intake pipe 20 or the airtightness of both may be reduced. In particular, when the airtightness is lowered, it becomes impossible to supply the required intake air amount.

The present invention has been made in order to solve the above problems, and its object is to reduce the number of parts and the assembly work steps to reduce the manufacturing cost, and further, It is an object of the present invention to provide a resonator capable of preventing the resonator from coming off from the hose and preventing the airtightness between the resonator and the hose from being deteriorated.

[0008]

To achieve the above object, the present invention provides a hose through which a gas can pass, and a resonator for reducing a predetermined frequency component of a propagating sound propagating in the hose by a resonance action. The gist is that the hose and the resonator are integrally formed.

[0009]

According to the resonator configured as described above,
Since the hose and the resonator are integrally molded, members such as a clamp and a collar, which are required when the hose and the resonator are separately provided, are unnecessary, and the resonator does not come off from the hose. Further, since the hose and the resonator are integrally molded, it is possible to prevent the airtightness of the boundary portion between the hose and the resonator from being lowered. Therefore, it is possible to prevent a shortage of intake air due to a decrease in airtightness.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a hose with a resonator used as an intake pipe of an internal combustion engine for automobiles will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the resonator-equipped hose 1 is fused with the first half-split body 2 and the second half-split body 3 abutting each other. A flow path 4 for intake air flowing toward the internal combustion engine is provided inside the hose 1 with a resonator.
Has become. The second half-split body 3 is shown only partially in FIGS. 2 and 3.

The resonator-equipped hose 1 has a bellows-like and hollow abdomen 5 in the middle thereof. The hose 1 with a resonator is made of a synthetic resin material such as polypropylene, sand place, or a thermoplastic elastomer, and is integrated by a molding method such as injection molding. The tip end (left end in FIG. 1) of the hose 1 with a resonator is connected to the air cleaner, and the base end (right end in FIG. 1) is connected to the throttle body of the internal combustion engine.

On the outer periphery of the tip of the hose 1 with a resonator,
A resonance box type first resonator 8 is integrally formed. The first resonator 8 includes a resonance tube 9 and a resonance chamber 10. The resonance tube 9 has a cylindrical shape and protrudes radially outward from the outer peripheral surface of the resonator-equipped hose 1. The resonance chamber 10 has a rectangular box shape and is provided at the tip of the resonance tube 9. The inside of the resonance chamber 10 is a space having a predetermined internal volume. The hose 1 with a resonator and the first resonator 8 are integrated with each other.

On the other hand, a second side branch type resonator 11 is integrally formed on the outer periphery of the base end portion of the hose 1 with a resonator. The second resonator 11 has a tubular shape with a J-shaped cross section, its tip is closed, and its inside is a space having a predetermined internal volume. The hose 1 with a resonator and the second resonator 11 are integrated like the first resonator 8. The first and second resonators 8 and 11 are silencers (resonators) for reducing the predetermined frequency component of the propagation sound propagating through the flow path 4 by applying the Helmholtz resonance principle.

In an internal combustion engine in which the hose 1 with a resonator is used as an intake pipe, intake air passes through a flow path 4 in the hose 1 with a resonator. At this time, the intake sound having a predetermined frequency component propagates in the intake pipe 1. During this propagation, the predetermined frequency component of the intake sound is reduced by the resonance action of the first and second resonators 8 and 11 provided outside the hose with resonator 1. In the first resonator 8, the frequency of this component is determined by the volume of the resonance chamber 10, the cross-sectional area of the resonance tube 9, the length of the resonance tube 9, and the like. On the other hand, in the second resonator 11, its cross-sectional area,
The frequency is determined by the length and the like.

Next, the operation and effect of the resonator constructed as above will be described. At the time of manufacturing the hose 1 with a resonator, in order to assemble the hose 1 with a resonator, the first resonator 8 and the second resonator 11, after the first and second half-split bodies 2, 3 are butted against each other, both 2, 3 The boundary part of is fused. By this fusion, the first resonator 8 and the resonance tube 11 are joined together in a state where there is no gap in the butted portion. By this joining, the hose portion functioning as the intake air flow path 4 and the resonator portion functioning as the resonator are simultaneously manufactured. At this time, the clamps 29 and 32 which are separate members described in the above-mentioned prior art,
Colors 28, 31 etc. are not used. For this reason, in the present embodiment, the clamp 2 which is a separate member, which is necessary in the above-mentioned conventional technique.
It is possible to omit 9, 32, collars 28, 31 and the like, and it is also possible to omit the number of assembly work steps.
As a result, the manufacturing cost can be reduced.

The hose with a resonator 1 and the first resonator 8 are integrated with the hose 1 with a resonator and the second resonator 11 so that the hose 1 with a resonator is integrated.
This prevents the first and second resonators 8 and 11 from coming off. At the same time, the airtightness between the hose with resonator 1 and the first resonator 8 is prevented, and the airtightness between the hose with resonator 1 and the second resonator 11 is prevented. By maintaining these airtightness, the supply shortage of the intake air of the first and second resonators 8 and 11 is prevented. Therefore, it is possible to prevent the predetermined frequency component of the intake sound propagating in the resonator-equipped hose 1 from increasing.

Further, before fusing the first and second half-split bodies 2 and 3, even if any foreign matter on the inner surface adheres to them, it is easy to find them visually. Can be done easily. Therefore, it is possible to easily find defective products of the first and second half-split bodies 2 and 3, and to prevent quality deterioration.

In addition, the predetermined frequency component of the intake sound propagating in the resonator-equipped hose 1 is determined by the dimensions of the first and second resonators 8 and 11. That is, since the collars 28 and 31 shown in the prior art can be omitted from the first and second resonators 8 and 11, the dimensional specifications of the first and second resonators 8 and 11 can be easily calculated, and the frequency characteristic of the intake sound is obtained. Will be easier to calculate. In addition, accurate calculation can be performed without causing an error in the dimensional specifications of the first and second resonators 8 and 11, and the resonance action as designed can be exhibited.

The present invention is not limited to the above embodiments, but may be modified as follows, for example, within the scope not departing from the spirit of the invention. (1) The first and second resonators 8 and 11 of the present invention can be applied to an exhaust pipe of an internal combustion engine as well as the hose 1 with a resonator.

(2) In the above embodiment, the first and second half-split bodies 2, 3 were fused together, but an adhesive agent was used to join the first and second semi-split bodies 2, 3 together. You may let me. In this case, as shown in FIG. 4, a fitting hole 17 is formed in the joint end face of the first half-split body 2 along the longitudinal direction thereof, and the joint end face of the second semi-crack body 3 is formed in the longitudinal direction thereof. A protrusion 18 is formed along the line. Then, the protrusion 18 is fitted into the fitting hole 17 coated with the adhesive. At this time, even if the adhesive overflows from the boundary between the first and second half-split bodies 2 and 3,
This adhesive is provided at the boundary and flows into the escape groove 19. Therefore, the adhesive does not adhere to the inside of the hose 1 with the resonator, and the quality deterioration can be prevented.

Further, as shown in FIG. 5, the first half-split body 2
Grooves 14 are formed along the longitudinal direction on the joint end surface of (1), and ridges 15 are formed along the longitudinal direction on the joint end surface of the second semi-split body 3. Then, the protrusion 15 is fitted into the groove 14 coated with the adhesive. At this time, even if the adhesive overflows from the boundary between the first and second half-split bodies 2, 3, it flows into the escape groove 16 provided at the boundary. Therefore, the adhesive does not adhere to the inside of the hose 1 with the resonator, and the quality deterioration can be prevented.

(3) In the above embodiment, the hose 1 with the resonator and the first and second half-split bodies 2, 3 were molded by the injection molding method, but in addition to this, the hose 1 with the resonator, the first and the second half. The two-half split bodies 2 and 3 may be formed by blow molding. This makes it possible to omit the welding work between the first and second half-split bodies 2, 3.
Moreover, the abdomen 5 and the portion other than the abdomen 5 of the hose 1 with a resonator can be formed of different resin materials.

[0024]

As described above in detail, according to the resonator of the present invention, it is possible to reduce the number of parts and the assembling work steps to reduce the manufacturing cost. This has an excellent effect that it is possible to prevent this from happening and prevent the airtightness between the resonator and the hose from being deteriorated.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a resonator and a hose in this embodiment.

FIG. 2 is likewise a perspective view showing a first resonator.

FIG. 3 is likewise a perspective view showing a second resonator.

FIG. 4 is a cross-sectional view showing a boundary portion between a first half-split body and a second semi-split body according to another embodiment.

FIG. 5 is a sectional view showing a boundary portion between a first half-split body and a second half-split body in the same manner.

FIG. 6 is a vertical cross-sectional view showing a resonator and a hose according to a conventional technique.

[Explanation of symbols]

1 ... Hose with a resonator (hose), 8 ... First resonator, 11 ... Second resonator

Claims (1)

[Claims] 1. A hose (1) through which a gas can pass, and a resonator (8, 11) for reducing a predetermined frequency component of a propagation sound propagating in the hose (1) by a resonance action. A hose with a resonator, wherein the hose (1) and the resonator (8, 11) are integrally molded.