JPH0719021A - Muffler and manufacturing method and device therefor - Google Patents

Abstract

PURPOSE:To provide a muffler having a long life construction at a low price by preventing loss of a glass wool while ensuring high muffler effect. CONSTITUTION:A glass wool layer 7 is filled and formed in an expansion chamber R between an outer chamber 5 and an inner chamber 6. The glass wool layer 7 is formed by winding a long steel wool band-like body along the periphery of the inner chamber 6 in spiral shape and then winding a glass wool mat having width size nearly the same size as length of the inner chamber 6 round the peripheral of it after forming a steel wool layer 8. Thereby, uniformed filling and formation of the glass wool layer 7 can be made possible and also scattering of the glass wool layer 7 into atmosheric air through a communicating hole 6a of the inner chamber 6 can be prevented efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler mounted on an automobile, a motorcycle, etc., a manufacturing method and a manufacturing apparatus for the muffler, and more particularly to an interior technology of a sound absorbing material filled in the muffler.

[0002]

2. Description of the Related Art For example, in the exhaust system of an automobile engine,
A muffler is provided to reduce the temperature and pressure of the exhaust gas emitted from the engine and to muffle the exhaust noise. The basic structure of this silencer is roughly classified into two types, a resonance type that applies the principle of resonance damping and an expansion type that has an expansion chamber. In reality, this is filled with a heat-resistant sound absorbing material. Generally, a compound formula is a complex combination of the above.

In the muffler shown in FIG. 13, a small-diameter inner chamber b having a large number of communication holes is inserted into a cylindrical outer chamber a to form an expansion chamber between the chambers a and b. A large-diameter inner chamber c is installed in the expansion chamber to form a double structure, and the outer peripheral portion of the large-diameter inner chamber c is filled with a heat-resistant sound absorbing material, preferably glass wool (glass fiber) d. ing.

In the muffler S constructed as described above, one end f of the small-diameter inner chamber b is communicated with the exhaust manifold g of the engine and the other end h is exhausted in a state of being housed in the protective cover e. It is open to the atmosphere via tube i. Then, the volume of exhaust gas discharged from the engine increases in the expansion chamber of the silencer S, the pressure decreases, the acoustic energy is consumed, and the sound absorbing material d
After being absorbed by, it is released to the outside air.

[0005]

However, such a structure has the following problems. That is, the large-diameter inner chamber c has the expansion chamber having a complicated double structure to enhance the sound deadening effect, and the glass wool d
Is arranged for the purpose of preventing the light from escaping into the atmosphere through the communication hole of the small-diameter inner chamber b and disappearing. However, when the expansion chamber becomes complicated, the inside of the expansion chamber looks like an arrow. Exhaust gas convection occurs, which causes resistance (back pressure) and reduces engine output (3-4 horsepower).

In this regard, although not shown, there is also proposed a structure in which the large-diameter inner chamber c is not provided and the entire expansion chamber is filled with glass wool d. According to this structure, the small-diameter inner chamber b is straight. The back pressure is low because it goes to, the problem of the engine output drop is improved, and the sound deadening effect is also good. On the other hand, the sound deadening effect is greatly influenced by the method of filling the glass wool d. However, it is extremely difficult to uniformly fill the glass wool d, and it is difficult to actually obtain the desired sound deadening effect. The problem of disappearance of glass wool d remains unsolved, and further improvements have been demanded.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a structure having a long life by preventing the disappearance of glass wool while ensuring a high sound deadening effect. It is an object of the present invention to provide a technology capable of inexpensively manufacturing a silencer.

[0008]

In order to achieve the above object, the silencer of the present invention has an inner chamber having a large number of communication holes inserted into a cylindrical outer chamber, and an expansion chamber between the chambers. Is formed, and a glass wool layer is filled and formed in the expansion chamber,
A steel wool layer is interposed between the glass wool layer and the outer circumference of the inner chamber, and the steel wool layer is formed by spirally winding a long steel wool band around the outer circumference of the inner chamber. The glass wool layer is characterized in that a wide glass wool mat is wound around the outer circumference of the steel wool layer.

A method of manufacturing a muffler of the present invention is a method of manufacturing a muffler having the above structure, in which a long steel wool band is provided on the outer periphery of the inner chamber from one end side of the inner chamber to another. Forming a steel wool layer by spirally winding to the end side, and winding a glass wool mat having a width dimension substantially the same as the length dimension of the inner chamber around the outer circumference of the steel wool layer to form the glass wool layer Is characterized by.

Specifically, the steel wool band is spirally wound around the outer periphery of the inner chamber while applying a uniform pressing force from the outer peripheral side to form a steel wool layer. After the above glass wool mat is wound around the outer periphery of the above, it is formed into a predetermined shape while applying a uniform pressing force from the outer peripheral side.

The muffler manufacturing apparatus of the present invention is for carrying out the above-described manufacturing method, and comprises a steel wool layer molding apparatus and a glass wool layer molding apparatus.

Specifically, the above-mentioned steel wool layer forming apparatus is arranged in parallel with an inner drive portion that supports both ends of the inner chamber and is driven to rotate, and an axis of the inner chamber that is rotatably supported by the inner drive portion. In addition, it is characterized in that it is provided with at least one pressing member made of an elastic material press roller capable of rolling contact with the outer peripheral surface of the inner chamber.

In the glass wool layer forming apparatus, the work driving unit that supports both ends of the inner chamber in which the steel wool layer is formed and is driven to rotate, and the axis line of the inner chamber that is rotatably supported by the work driving unit are parallel to each other. And a pressure molding section having a plurality of press rollers capable of rolling contact with the outer peripheral surface of the inner chamber.

[0014]

In the muffler of the present invention, the expansion chamber is formed between the outer chamber and the inner chamber, and
The simple structure in which the glass wool layer is filled and formed in the expansion chamber prevents convection of engine exhaust gas that causes back pressure.

By interposing the steel wool layer between the glass wool layer and the inner chamber, the glass wool layer is prevented from being diffused into the atmosphere through the communication hole of the inner chamber.

Further, in manufacturing the silencer, a long steel wool band is spirally wound from one end side to the other end side of the inner chamber around the outer circumference of the inner chamber to form a steel wool layer. By winding a glass wool mat having a width dimension substantially the same as the length dimension of the inner chamber around the outer circumference of the steel wool layer to form the glass wool layer, it is possible to uniformly form the glass wool layer.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

A muffler according to the present invention is shown in FIGS. 1 and 2, and this muffler 1 is specifically for an automobile, and is housed in a protective cover 2 so that the exhaust system of an engine is housed. And one end 1a thereof communicates with the exhaust manifold end portion 3 of the engine, and the other end 1b thereof is opened to the atmosphere through the exhaust pipe 4.

In the muffler 1, the inner chamber 6 is inserted into the outer chamber 5, and both chambers 5 and 6 are inserted.
An expansion chamber R is formed therebetween, and a glass wool layer 7 is filled and formed in the expansion chamber R. A steel wool layer 8 is interposed between the glass wool layer 7 and the outer circumference of the inner chamber 6.

The outer chamber 5 is made of a thin steel plate forming the casing of the silencer 1, and has a cylindrical main body 9 and lids 10, 10 integrally attached to both ends of the cylindrical main body 9. Consists of. These lids 10, 10
The openings 5a and 5b are formed in the
The inner chamber 6 is penetrated through a and 5b.

The inner chamber 6 forms a portion through which exhaust gas from the engine passes. A thin stainless steel plate is formed in a cylindrical shape, and a large number of communication holes 6a, 6a, ... Are evenly arranged. Both ends of the inner chamber 6 are welded to the openings 5a and 5b of the outer chamber 5 so that the space formed by these chambers 5 and 6 serves as the expansion chamber R, and the openings at both ends of the inner chamber 6 are external. Facing each other, the both ends 1a, 1b of the silencer 1 described above are formed.

The glass wool layer 7 is for absorbing and attenuating the acoustic energy of the exhaust gas discharged from the engine. Specifically, the glass wool layer forming device 22 of the silencer manufacturing device described later causes a wide glass wool mat 7 to be absorbed.
As shown in FIG. 4, a is wound around the inner chamber 6 in a laminated manner with a steel wool layer 8 interposed therebetween. The glass wool layer 7 is closely fitted into the inner diameter surface of the cylindrical body 9 of the outer chamber 5, and the outer peripheral surfaces of both ends thereof are formed into tapered taper surfaces.

The steel wool layer 8 is mainly for preventing the glass wool of the glass wool layer 7 from escaping from the communication holes 6a, 6a, ... Of the inner chamber 6 to the outside of the muffler 1. Is made of SUS (stainless steel) wool, and a long steel wool (SUS wool) strip 8a is formed by the steel wool layer forming device 21 of the silencer manufacturing device, which will be described later, as shown in FIG. It is spirally wound around the outer circumference.

Next, an apparatus for manufacturing the muffler 1 will be described. This manufacturing apparatus includes a steel wool molding apparatus 21 shown in FIGS. 5 to 8 and a glass wool molding apparatus 22 shown in FIGS. 9 to 12. Hereinafter, each of these apparatuses 21 and 22 will be specifically described. explain.

A. Steel wool layer forming device 21: The steel wool layer forming device 21 forms the steel wool layer 8, and is constituted by a steel wool supply unit 30, an inner driving unit 31, and a pressurizing unit 32 as main parts. 32 are mounted on the device base 33.

Specifically, the steel wool supply section 30 is composed of a payout roll 35 around which the steel wool band 8a is wound, and a roll support section 36 for rotatably supporting the payout roll 35.

As shown in FIG. 6, the roll supporting portion 36 has columns 37, 37 provided upright on the rear portion of the apparatus base 33, and a supporting bracket 37 on the upper end portion thereof.
a and 37a are attached to the support brackets 37a and 37a.
a is rotatably supported. The steel wool strip 8a delivered from the delivery roll 35 is
As will be described later, it is drawn in and supplied to the outer periphery of the inner chamber 6 which is rotatably supported by the inner drive unit 31.

The inner drive section 31 supports both ends 1a and 1b of the inner chamber 6 and rotatably drives the inner chamber 6. The inner drive section 31 is composed of a drive mechanism 40 and a chuck mechanism 41, and as shown in FIG. Is disposed in the section.

The drive mechanism 40 is one end 1 of the inner chamber 6.
A is detachably supported and includes a rotary drive shaft 42 and a drive source (not shown) for the rotary drive shaft 42.

The rotary drive shaft 42 is rotatably supported on the apparatus base 33 via a bearing 44, and has a support cone 43 having a tapered shape at the tip thereof. The one end 1a of the inner chamber 6 can be inserted and locked. Further, a transmission pulley 45 is attached to the base end of the rotary drive shaft 42, and a transmission belt (not shown) wound around the transmission pulley 45 is linked to a drive motor which is a drive source.

The chuck mechanism 41 chucks and supports the other end of the inner chamber 6 and is arranged so as to face the drive mechanism 40. Specifically, the chuck mechanism 41 is composed of an air cylinder device.

The air cylinder device 41 has a cylinder body 41a mounted horizontally on the device base 33, and a piston cone 41 at the tip of which has a tapered support cone 46. The piston rod 41b is arranged so as to advance and retreat (reciprocate) along the same axis as the rotary drive shaft 42, and the support cone 51 causes the inner cone 6 to move.
The other end 1b can be locked in and out of engagement.

Both ends 1a and 1b of the inner chamber 6 are chucked and supported by the support cones 43 and 46 by the advancing operation of the air cylinder device 41, and the rotation speed of the rotary drive shaft 42 is increased to a predetermined rotational speed. And is rotated in the winding direction A.

The pressing section 32 is made of steel wool strip 8a.
Is applied to the outer circumference of the inner chamber 6 when it is wound around the inner chamber 6, and a pair of press rollers arranged parallel to the axis of the inner chamber 6 rotatably supported by the inner drive unit 31. 55, 55 are provided.

Each press roller 55 is made of an elastic material, and more specifically, is composed of a rubber roller having a rubber layer formed on the outer periphery of a metal core material, and the bearings 56,
It is rotatably supported on the apparatus base 33 via 56. This press roller 55, as shown in FIG.
The outer peripheral surface 55a has a predetermined pressing force on the outer peripheral surface of the inner chamber 6 (rubber elasticity of the press roller 55 itself).
Or are arranged so as to be in sliding contact with each other. Further, both press rollers 55, 55 are set to support the lower two places of the inner chamber 6 attached to the inner drive unit 31.

When the rotary drive shaft 42 is driven to rotate while the inner chamber 6 is chucked and supported by the drive mechanism 40 and the chuck mechanism 41 of the inner drive section 31, the inner chamber 6 rotates in the winding direction A. Due to the rotation of the inner chamber 6, the steel wool strip 8a supplied from the pay-out roll 35 is fed in the axial direction of the inner chamber 6 while being spiraled from the one end 1b side of the outer circumference of the inner chamber 6 to the other end 1a side. The steel wool layer 8 is formed by being wound in a circular shape.

At this time, the press rollers 55, 55 of the pressurizing section 32 are rollingly contacted with the outer circumference of the inner chamber 6 to apply a uniform pressing force (rubber resilience) to the steel wool band 8a from the outer circumference side. As a result, the steel wool strip 8
A is uniformly wound around the entire outer circumference of the inner chamber 6 with a predetermined tightening force.

B. Glass wool layer forming device 22: The glass wool layer forming device 22 forms the glass wool layer 7, and includes a glass wool supplying section 60, a work guiding section 61, a work driving section 62, a pressure forming section 63 and an adhesive applying section 6.
4 as a main part, and these constituent devices 60 to 64
Are mounted on the device base 65.

The glass wool supplying section 60 is specifically,
A cutting machine (not shown) and a conveyor 70 are provided, and a belt conveyor is used as the conveyor 70. The transport conveyor 70 includes the inclined portion 6 of the device base 65.
5a, a base end or lower end 70a thereof is provided adjacent to the cutting machine, and a front end or upper end 70b thereof is connected to the work guide portion 61.

A plurality of glass wool mats 7a, which are cut into a mat having a predetermined size by the above-mentioned cutting machine, are stacked in layers (for example, about 30 sheets) to form a set, which is conveyed in the direction of arrow B. And is carried to the work guide section 61.

The work guide section 61 is provided at the upper end 7 of the conveyor.
, 0b for guiding the glass wool mats 7a, 7a, ... To the work drive unit 62, and specifically, is constituted by a first air cylinder device 75.

The cylinder body 75a of the first air cylinder device 75 is attached to the first support portion 76 of the device base 65 in a vertically downward direction, and the piston rod 75b.
Is configured to move forward and backward (reciprocating motion). At the tip of the piston rod 75b, a guide roller 77 is provided horizontally and freely rotatable via a roller support 78. This guide roller 77 is
As the piston rod 75b moves up and down, the piston rod 75b is moved up and down along the first support portion 76.

The work drive unit 62 is composed of the steel wool layer 8
The inner chamber 6 is formed so as to support both ends of the inner chamber 6 and is driven to rotate. The basic structure of the work drive unit 62 is similar to that of the inner drive unit 31 of the steel wool layer forming apparatus 21, and the description thereof will be omitted.

The press-molding section 63 is used for the glass wool mat 7
When a is wound around the outer circumference of the steel wool layer 8 of the inner chamber 6, it is formed by applying a uniform pressing force from the outer circumference of the inner wool 6, and a pair of fixed-side press rollers 80, 8
1 and one movable press roller 82.

The pair of stationary press rollers 80 and 81 are
It is arranged parallel to the axis of the inner chamber 6 that is rotatably supported by the work drive unit 62, and specifically, is rotatably supported on the device base 65 via bearings 83 and 83, respectively. There is.

These fixed side press rollers 80 and 81 are
The outer peripheral surfaces 80a and 81a have the glass wool mat 7 wound around the inner chamber 6 as described later.
It is arranged on the outer periphery of a so as to be in rolling contact with a predetermined pressing force.

Further, both fixed side press rollers 80, 81
Is the work drive unit 6 as shown in FIGS.
It is set so as to support the lower two places of the inner chamber 6 attached to the No. 2, strictly speaking, the lower two places of the glass wool mat 7a wound around the inner chamber 6.

The movable side press roller 82 is mounted on the second air cylinder device 85, and the cylinder body 85a of the second air cylinder device 85 is vertically downward to the second support portion 86 of the device base 65. The piston rod 85b is attached and is configured to advance and retract (reciprocate) in the vertical direction. The movable-side press roller 82 is provided at the tip of the piston rod 85b in a horizontal and freely rotatable manner via a roller support 87.

That is, the movable-side press roller 82 is arranged parallel to the axis of the inner chamber 6 which is rotatably supported by the work driving section 62, and the piston rod 8 is provided.
By moving the 5b up and down in the vertical direction, it is moved up and down along the second support portion 86 so that it can be brought into and out of contact with the inner chamber 6.

In relation to this, the guide rails 86a, 86a are provided on the second support portion 86 so as to extend in the vertical direction, and the guide rails 86a, 86a are provided at both end portions of the roller support 87. A sliding member 87a for slidingly guiding the
87a is provided.

Further, the relative positional relationship of the three press rollers 80 to 82 is, more strictly, in a state where the movable side press roller 82 is in rolling contact with the inner chamber 6, more strictly, the glass wool wound around the inner chamber 6. Matte 7
a structure in which the three press rollers 80 to 82 support the outer peripheral portion of the glass wool mat 7a at the circumferentially equidistant positions in a state of being rolled on the outer periphery of the a (3 equidistant support structure). Is formed so as to form the roundness of the glass wool layer 7.

Forming collars 90a, 90b and 90c are provided at both ends of the press rollers 80 to 82, respectively, and the glass wool layer 7 is formed by these forming collars 90a to 90c and the press roller outer peripheral surfaces 80a to 82a. Is formed into a predetermined shape. The predetermined shape of the glass wool layer 7 formed by this forming surface is set to be a contour shape that accurately follows the inner surface of the outer chamber 5. That is, the glass wool layer 7
The outer peripheral surfaces 80a to 82a of the press roller form a cylindrical outer diameter surface along the inner diameter surface of the cylindrical body 9 of the outer chamber 5 and the molding collar 90.
By a, 90b, 90c, the outer peripheral surfaces of both ends thereof are formed into tapered taper surfaces.

In connection with this, as shown in FIG. 12, the molding collar 90a of the one stationary press roller 80 is provided with a guide flange 91 for guiding the glass wool mat 7a, and the movable press Roller 8
The molding collar 90c of No. 2 has a glass wool mat 7a.
A shaping cutter 92 for aligning both end edges of the is provided. The shaping cutter 92 also has a function of defining the thickness of the glass wool layer 7. The molding collar 90
The a, 90b, and 90c are movable and adjustable in the axial direction of the press rollers 80 to 82, and have a structure that can correspond to the silencer 1 of various shapes and dimensions. The press roller 80 having the molding collars 90a, 90b, 90c fixed thereto is provided.
It is possible to prepare a plurality of types to 82 and to make them dedicated to the muffler 1 of various shapes and dimensions.

When the rotary drive shaft 42 is driven to rotate while the inner chamber 6 is chucked and supported by the drive mechanism 40 and the chuck mechanism 41 of the work drive section 62, the inner chamber 6 rotates in the winding direction C. To be done. Then, the glass wool mat 7a guided by the guide roller 77 of the work guide portion 61 is wound around the steel wool layer 8 while being guided by the guide flange 91 by the rotation of the inner chamber 6 to form the glass wool layer 7. Go.

At this time, before the completion of winding the glass wool mat 7a around the outer circumference of the steel wool layer 8, there are gaps between the press rollers 80 to 82 and the glass wool mat 7a. Then, this gap gradually decreases as the winding of the glass wool mat 7a progresses,
Finally, the press rollers 80 to 82 are brought into rolling contact with the outer circumference of the glass wool mat 7a. As a result, a uniform pressing force is applied to the glass wool mat 7a from the outer peripheral side, and the glass wool mat 7a is pressed and molded into a predetermined shape while being uniformly wound and solidified with a predetermined tightening force, and both ends thereof. The edges are also cut and shaped by the shaping cutter 92.

The adhesive application section 64 is for ensuring shape retention when the glass wool layer 7 is pressure-molded, and is provided in the vicinity of the work drive section 62 as shown in FIG. Has been. The adhesive application section 64 sprays the molding adhesive from the front, back, left and right onto the outer peripheral portion of the glass wool layer 7 in the final molding stage. In the illustrated example, an inorganic resin adhesive is preferably used as the molding adhesive.

Next, a method of manufacturing the muffler 1 using the muffler manufacturing apparatuses 21 and 22 configured as described above will be described (see FIGS. 5 to 8).

1. Formation of Steel Wool Layer 8: The steel wool layer forming device 21 forms the steel wool layer 8 by winding the steel wool band 8a around the outer periphery of the inner chamber 6 in the following procedure.

First, the end of the steel wool strip 8a pulled out from the steel wool supply unit 30 is manually wound around the outer periphery of one end of the inner chamber 6, and then the inner chamber 6 is driven by the inner drive as described above. Part 3
Set to 1.

Subsequently, when the drive mechanism 40 of the inner drive unit 31 is started, the inner chamber 6 is moved in the winding direction A.
The steel wool strip 8a is wound around the outer circumference of the inner chamber 6 while being pulled out from the steel wool supply section 30 by rotating to.

At this time, as described above, the steel wool strip 8a is formed by assisting the steel wool strip 8a to be manually fed in the axial direction of the inner chamber 6.
While being pressed by the press rollers 55 of the pressing unit 32, the inner chamber 6 is spirally wound from the one end 1b side to the other end 1a side to form the steel wool layer 8. The final size of the steel wool layer 8 is determined by the shape and size of the muffler 1. For example, when the length of the muffler 1 is around 450 mm and the outer diameter is around 95 mm, the thickness of the steel wool layer 8 is Is set to 3 to 4 mm (weight of about 100 g).

When the formation of the steel wool layer 8 is completed (see FIG. 3), the steel wool strip 8a is cut, the final end thereof is wound and fixed, and then the inner chamber 6 is driven in the reverse order of the process. Remove from part 31.

2. Formation of the glass wool layer 7: Subsequently, the glass wool layer forming device 22 forms the glass wool layer 7 by winding the glass wool mat 7a around the outer circumference of the steel wool layer 8 of the inner chamber 6 in the following procedure (FIGS. 9 to 9). (See FIG. 12).

First, the upper end 70 b of the transfer conveyor 70
One of the uppermost ones of the glass wool mats 7a, 7a, ... Mounted on the substrate is manually taken, and one end thereof is guided to the work driving unit 62 via the work guiding unit 61. Then, this one end is wound around the outer circumference of the steel wool layer 8 of the inner chamber 6, and then the inner chamber 6 is set in the work drive unit 62 in the manner described above.

Then, after adjusting the height position of the guide roller 77 of the work guide unit 61, the work drive unit 62 is moved.
The drive mechanism 40 is started at a low speed. Then, the inner chamber 6 rotates in the winding direction C, and the glass wool mat 7a is wound around the steel wool layer 8 while being guided by the guide roller 77 and the guide flange 91 of the fixed press roller 80. .

At this time, the movable side press roller 82 is still retracted upward, and the outer circumference of the glass wool mat 7a is
It is pressed by the rolling contact of the pair of fixed-side press rollers 80, 81, and preliminary pressure molding is performed to some extent.

When the winding of the glass wool mat 7a is completed, the movable side press roller 82 is lowered to be brought into rolling contact with the outer circumference of the glass wool mat 7a, and the driving mechanism 40 is switched to the high speed operation. At the same time, the adhesive applying section 64 is started to uniformly spray the molding adhesive on the outer circumference of the glass wool mat 7a.

As a result, the glass wool mat 7a is
While being pressed uniformly with a predetermined tightening force by the three press rollers 80 to 82, it is pressure-molded into a predetermined shape and both end edges thereof are cut and shaped by the shaping cutter 92 to form the glass wool layer 7 of a predetermined shape. To be done.

The final size of the glass wool layer 7 is set to have a width of about 415 mm and an outer diameter of about 90 mm (weight of about 280 g) when the shape and size of the silencer 1 are set as described above. It Therefore, the glass wool mat 7a to be used is cut in advance by a cutting machine into a rectangular shape having a width of about 435 mm and a length of about 800 to 1200 mm. In this case, the cutting portion of the glass wool mat 7a is not a cut edge with a sharp cutting blade,
The cut end is torn off, that is, the cut end thickness is gradually reduced toward the end so that no step is formed at the winding end of the glass wool mat 7a.

When the formation of the glass wool layer 7 is completed (see FIG. 4), the inner chamber 6 is reversely processed.
After being removed from the work drive unit 62, it is placed in a drying oven to dry the molding adhesive.

3. Assembling and mounting of silencer 1: Finally, the inner chamber 6 having the glass wool layer 7 thus formed is inserted into the cylindrical body 9 of the outer chamber 5, and the lids 10 and 10 are provided at both ends thereof, respectively. After fitting, these are integrated by welding etc. and it is set as the completed product 1 shown in FIG. In this case, since the outer peripheral surfaces of both ends of the glass wool layer 7 are formed into the tapered surfaces as described above, the inner chamber 6 can be smoothly inserted into the cylindrical body 9 and both end portions of the cylindrical body 9 can be smoothly inserted. Up to the glass wool layer 7 is formed. The muffler 1 configured as described above is used by being inserted into the exhaust system of an automobile engine while being housed and supported in the protective cover 2.

Thus, the exhaust gas discharged from the engine is increased in volume in the expansion chamber R of the silencer 1 and its pressure is lowered, and its acoustic energy is consumed.
After being absorbed by the glass wool layer 7 as a sound absorbing material and being silenced, it is released to the outside air. In this case, since the expansion chamber R has a simple structure, convection of engine exhaust gas that causes back pressure is effectively prevented.

A steel wool layer 8 is interposed between the glass wool layer 7 and the inner chamber 6, and the glass wool of the glass wool layer 7 is passed through the communication holes 6a, 6a, ... Of the inner chamber 6. Dispersion into the atmosphere is effectively suppressed.

It should be noted that the above-mentioned embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope thereof.

For example, the detailed structure of the muffler 1 is not limited to the illustrated example, but may be designed appropriately according to its use and application size. Numerical conditions and the like are merely examples.

Further, the specific construction of the silencer manufacturing apparatuses 21 and 22 is also a semi-automatic construction by manual operation in addition to manual work in the illustrated example, but each constituent device is driven and controlled by a microcomputer or the like. As a configuration to be performed, it is of course possible to use a fully automated device configuration.

Further, the press rollers 55, 55 of the steel wool layer forming device 21 and the glass wool layer forming device 2
The number of the two press rollers 80 to 82 and the relative positional relationship between them are set to those other than the illustrated example under the condition that a uniform pressing force is applied during the molding of the steel wool layer 8 and the glass wool layer 7, respectively. be able to.

For example, in the case of the glass wool layer forming device 22, as shown in FIG. 13 (a), one fixed side press roller 180 and one movable side press roller 182 are attached to the inner wool chamber 6 of the glass wool mat 7a. The outer periphery is supported by rolling from above and below, or as shown in FIG. 13 (b), a pair of fixed-side press rollers 180, 181
The pair of movable side press rollers 182 and 182 may support the outer circumference of the glass wool mat 7a wound around the inner chamber 6 at the circumferentially equidistant positions (4 equidistant supporting structure).

[0079]

As described in detail above, according to the muffler of the present invention, an expansion chamber is formed between the outer chamber and the inner chamber, and a glass wool layer is filled and formed in the expansion chamber. With such a structure, convection of engine exhaust gas, which causes back pressure, is prevented from occurring, and a decrease in engine output is effectively prevented.

Further, since the steel wool layer is interposed between the glass wool layer and the inner chamber, the glass wool layer is prevented from escaping into the atmosphere through the communication hole of the inner chamber, and the life is long.

Further, according to the silencer manufacturing method of the present invention, a long steel wool band is spirally wound around the outer circumference of the inner chamber from one end side to the other end side of the inner chamber to form a steel wool layer. After forming, around the outer circumference of the steel wool layer, a glass wool mat having a width dimension substantially the same as the length dimension of the inner chamber is wound to form a glass wool layer, so uniform and uniform formation of the glass wool layer is easy and reliable. The desired high noise reduction effect can be stably ensured, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing a silencer, which is an embodiment of the present invention, with a part thereof being cut away.

FIG. 2 is a cross-sectional view showing the silencer taken along line II-II in FIG.

FIG. 3 is a partial cross-sectional front view showing a state in which a steel wool layer is formed in the inner chamber of the silencer.

FIG. 4 is a partial cross-sectional front view showing a state in which a steel wool layer and a glass wool layer are formed in the inner chamber of the silencer.

FIG. 5 is a schematic front view showing a steel wool layer forming apparatus which constitutes the silencer manufacturing apparatus.

FIG. 6 is a schematic side view showing the steel wool layer forming apparatus.

FIG. 7 is a plan view showing a main configuration of the steel wool layer forming apparatus.

[Fig. 8] Fig. 7 is a view showing the main configuration of the steel wool layer forming apparatus.
FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a schematic front view showing a glass wool layer forming apparatus that constitutes the silencer manufacturing apparatus.

FIG. 10 is a schematic side view showing the glass wool layer forming apparatus.

FIG. 11 is a plan view showing a main configuration of the glass wool layer forming apparatus.

[Fig. 12] Fig. 1 is a view showing the main configuration of the glass wool layer forming apparatus.
2 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a cross-sectional view showing a modified example of the main configuration of the glass wool layer forming apparatus. FIG. 13 (a) shows a structure in which a pair of upper and lower press rollers rolls and supports the outer circumference of the glass wool mat on the inner chamber from above and below. FIG. 13B shows a structure in which a pair of upper and lower press rollers support the outer circumference of the glass wool mat on the inner chamber in four equal arrangements.

FIG. 14 is a partial sectional front view corresponding to FIG. 1, showing a conventional silencer with a part thereof cut away.

[Explanation of sign]

 R Expansion chamber 1 Muffler 2 Protective cover 3 Exhaust manifold end 4 Exhaust pipe 5 Outer chamber 6 Inner chamber 6a Communication hole 7 Glass wool layer 7a Glass wool mat 8 Steel wool layer 8a Steel wool band 9 Outer chamber cylinder body 10 Outer Chamber lid 20 Silencer manufacturing device 21 Steel wool layer forming device 22 Glass wool layer forming device 30 Steel wool supplying part 31 Inner drive part 32 Pressurizing part 40 Drive mechanism 41 Chuck mechanism 42 Rotation drive shaft 44 Support cone 50 Air cylinder device 51 Support Cone 55 Press Roller (Rubber Roller) 60 Glass Wool Supply Section 61 Work Guide Section 62 Work Drive Section 63 Pressure Forming Section 64 Adhesive Application Section 70 Transfer Conveyor 75 First Air Cylinder Device 77 Guide Roller 80,81 Fixed-side press roller 82 Movable-side press roller 85 Second air cylinder device 90a to 90c Molding collar 91 Guide flange 92 Shaping cutter

Claims (15)

[Claims] 1. An inner chamber having a large number of communication holes is inserted into a cylindrical outer chamber to form an expansion chamber between both chambers, and a glass wool layer is filled and formed in the expansion chamber. A steel wool layer is interposed between the glass wool layer and the outer circumference of the inner chamber, and the steel wool layer has a long steel wool band spirally formed on the outer circumference of the inner chamber. A silencer characterized in that the glass wool layer is wound around a steel wool layer and a wide glass wool mat is wound around the steel wool layer. 2. The silencer according to claim 1, wherein the glass wool layer is closely fitted to the inner diameter surface of the cylindrical main body of the outer chamber, and both outer peripheral surfaces of both ends thereof are formed into tapered taper surfaces. . 3. An inner chamber having a large number of communication holes is inserted into a cylindrical outer chamber to form an expansion chamber between both chambers, and a glass wool layer is filled and formed in the expansion chamber. A method of manufacturing a silencer, wherein a long steel wool strip is spirally wound from one end side to the other end side of the inner chamber on the outer circumference of the inner chamber to form a steel wool layer. A method for manufacturing a silencer, comprising forming a glass wool layer by winding a glass wool mat having a width dimension substantially the same as the length dimension of the inner chamber around the outer circumference of the wool layer. 4. The method of manufacturing a silencer according to claim 3, wherein the steel wool band is spirally wound around the outer circumference of the inner chamber while applying a uniform pressing force from the outer circumference. 5. The silencer according to claim 3, wherein the glass wool mat is wound around the outer circumference of the steel wool layer and then shaped into a predetermined shape by applying a uniform pressing force from the outer circumference side. Method. 6. An inner drive portion that supports both ends of the inner chamber and is driven to rotate, and an inner drive portion that is arranged parallel to the axis of the inner chamber that is rotatably supported by the inner drive portion and that rolls on the outer peripheral surface of the inner chamber. A steel wool layer forming apparatus, comprising: a pressurizing unit including at least one elastic press roller. 7. The inner drive section includes a drive mechanism that detachably supports one end of the inner chamber, and a chuck mechanism that is disposed so as to face the drive mechanism and chucks and supports the other end of the inner chamber. The steel wool layer forming apparatus according to claim 6, comprising: 8. The steel wool layer molding according to claim 6, wherein the pressurizing unit comprises a pair of rubber rollers rotatably supported so as to be capable of rolling contact with an outer peripheral surface of an inner chamber rotatably supported by the inner drive unit. apparatus. 9. A work drive unit that rotatably drives both ends of an inner chamber having a steel wool layer formed thereon, and a work drive unit that is arranged parallel to the axis of the inner chamber rotatably supported by the work drive unit. A glass wool layer forming apparatus, comprising: a pressure forming unit having a plurality of press rollers capable of rolling contact with the outer peripheral surface of the inner chamber. 10. The work drive unit includes a drive mechanism that detachably supports one end of the inner chamber, and a chuck mechanism that is disposed so as to face the drive mechanism and chucks and supports the other end of the inner chamber. The glass wool layer forming apparatus according to claim 9, which comprises: 11. The pair of fixed-side press rollers and one movable side, wherein the press-molding section is arranged parallel to the axis of the inner chamber and is rotatably supported so as to be capable of rolling contact with the inner chamber. The glass wool layer forming apparatus according to claim 9, further comprising a press roller, wherein the press roller is set and arranged so as to form a three-part support structure in a state in which the press roller is in rolling contact with the outer circumference of the inner chamber. . 12. The glass wool layer forming apparatus according to claim 11, wherein both ends of the press roller are provided with a forming collar for forming the end portion of the glass wool layer into a predetermined shape. 13. The glass wool layer molding apparatus according to claim 12, wherein the molding collar is configured to form the tapered outer peripheral surface of the end portion of the glass wool layer. 14. An adhesive application section for injecting a molding adhesive onto the glass wool layer formed on the inner chamber is provided in the vicinity of the work driving section.
The glass wool layer forming apparatus described in 1. 15. A steel wool layer forming apparatus according to any one of claims 6 to 8 and a glass wool layer forming apparatus according to any one of claims 9 to 14. Characteristic silencer manufacturing equipment.