JP2003041931A - Muffler device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify shielding structure and installation structure of a muffler body by parting a heat insulating sheet to be installed on the outer side of the muffler body, and covering these with an aluminum sheet. SOLUTION: The heat insulating sheet 24 to cover the muffler body 22 is composed of five sheet parts 25, 26, 27, 28 and 29, and two muffler installation gaps 30 are formed among them. The heat insulating sheet 24 and the gaps 30 are covered with the aluminum sheet 31 from the outer side. Band type installation metal fittings 32 are wound around the aluminum sheet 31 at the positions of the gaps 30, and a screwed rod 32A on the end part side is tightened with a bracket 23 on the side of an engine 6. Need for conducting cutting work or the like to the heat insulating sheet 24 is thus eliminated in shielding and protecting the whole surface of the muffler body 22 with the aluminum sheet 31. The installation structure of it is simplified.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a construction machine,
The present invention relates to a muffler device preferably used for various machines such as agricultural machines and automobiles.

[0002]

2. Description of the Related Art Generally, an engine (internal combustion engine) is used for various machines such as construction machines, agricultural machines and automobiles.
There are some that operate with the power source. As such a machine, a construction machine such as a hydraulic excavator or a hydraulic crane will be described as an example. For example, in a hydraulic excavator, a hydraulic pump or the like is driven by using an engine as a power source, and pressure oil is supplied to each part of the vehicle. By supplying it, excavation work such as earth and sand, turning of the vehicle, running and the like are performed.

A hydraulic excavator of this type according to the prior art is
Various devices such as an engine, an air cleaner, a radiator, a muffler, and a hydraulic pump are mounted on the vehicle body, and these devices are covered by a building cover that constitutes the outer shell of the vehicle body.

A part of the building cover is an engine cover which is opened and closed at a position facing the engine and the like. Then, for example, when a vehicle maintenance work or the like is performed, an operator opens the engine cover to inspect or replace each component.

In this case, during maintenance work, for example, immediately after the operation of the hydraulic excavator is completed, there is a risk that the worker may accidentally contact the hot muffler. Therefore, in the related art, the muffler has a structure in which a heat insulating material is attached.

A conventional muffler device will be described below with reference to FIGS. 14 and 15. First, 101 is a cylindrical muffler main body having a sound deadening member (not shown) provided therein, and the muffler main body 101 is provided with a pipe portion 101A,
One of the pipes 101A is connected to the exhaust pipe side of the engine, and the other pipe 101A is extended toward the outside of the building cover. Further, on the outer peripheral side of the muffler body 101, four leg portions 102 made of, for example, elongated metal pieces are provided in a protruding manner, and the tip ends of the leg portions 102 are attached to, for example, the engine body or its vicinity. Has become.

Reference numeral 103 denotes a heat insulating material that covers the muffler main body 101 from the outside. The heat insulating material 103 is formed in a thick sheet shape by a heat insulating material containing glass fiber, for example, and a thin aluminum sheet 104 is provided on the outer surface side. Is provided. In addition, the heat insulating material 103 and the aluminum sheet 104 are formed with four cutout holes 105 penetrating the leg portions 102 of the muffler body 101 so as to project outward.

[0008]

By the way, in the above-mentioned prior art, the muffler body 101 is exposed to the outside at the position of each cutout hole 105. Therefore, when the hydraulic excavator is used, foreign matter such as dust and water enters the cutout hole 105 from the outside and the muffler body 101 and the heat insulating material 1
It may invade into a minute gap between the muffler body 03 and the rust, etc.
There is a problem that the life of 1 is shortened.

In addition, when assembling the muffler device, the heat insulating material 103 and the aluminum sheet 104 must be partially cut off to form the four cut holes 105, which is troublesome to cut out. Since the heat insulating material 103 is exposed at the position of each cutout hole 105, the appearance of the muffler device deteriorates. In addition, there is a problem that the leg portions 102 protruding outside the heat insulating material 103 and the aluminum sheet 104 are likely to reach a high temperature due to heat conduction from the muffler body 101 during operation of the engine.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to reliably shield the muffler body with a simple structure, simplify the shielding structure and the mounting structure, and assemble the muffler body. An object of the present invention is to provide a muffler device capable of improving workability at the time and improving durability and life.

[0011]

In order to solve the above-mentioned problems, the invention of claim 1 is a muffler body which is formed as a cylindrical body whose both sides in the lengthwise direction are closed and which is provided with a muffling member inside. , A muffler mounting which is formed as a plurality of divided sheets of a heat insulating material and covers the outer peripheral surface of the muffler main body by dividing the outer peripheral surface of the muffler into a plurality of pieces in the lengthwise direction and the outer peripheral surface of the muffler main body is exposed between the divided sheets A heat insulating sheet forming a gap for heat treatment, an aluminum sheet formed of a flexible sheet material to cover the muffler body from the outside of the heat insulating sheet including the muffler attaching gap, and a muffler attaching gap of the heat insulating sheet. At a position, a mounting tool is installed around the aluminum sheet from the outside of the muffler body and mounted on the bracket side.

With such a structure, the outer peripheral surface of the muffler body can be covered with the heat insulating sheet, and in this state, a muffler mounting gap can be formed between the divided sheets of the heat insulating sheet. The aluminum sheet can cover the entire surface of the muffler body from the outside of the heat insulating sheet, including the position of the muffler mounting gap. Since the fixture can be wound around the muffler body from the outside of the aluminum sheet at the position of the muffler attachment gap and can be arranged at intervals in the length direction of the muffler body, it is provided on the body side of the vehicle, machine, etc., for example. The muffler body can be stably attached to the bracket.

According to the second aspect of the present invention, the heat insulating sheet covers not only the outer peripheral surface of the muffler body but also the end surface.

Thus, the heat insulating sheet can cover the entire surface of the muffler body except the position of the muffler mounting gap, and the heat insulating performance can be improved.

Further, according to the invention of claim 3, the fixture is formed by a flexible band-shaped material or a clamp material having expandability, and its longitudinal intermediate portion is wound around the outer peripheral side of the muffler body. In this state, both ends are attached to the bracket side.

Thus, for example, when the mounting member is formed of a flexible band-shaped member, the mounting member can be flexibly deformed at the position of the muffler mounting gap and wound around the outer peripheral side of the muffler body, and its length. The muffler body can be easily fixed to the bracket by attaching both ends in the direction to the bracket side.

When the fitting is formed of a clamp material having expandability, the diameter of the fitting is expanded and inserted into the outer peripheral side of the muffler body, and then the fitting is reduced in diameter at the muffler mounting gap. Thus, the muffler body can be easily wound around the outer peripheral side.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A muffler device according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings, taking a case where the muffler device is applied to a hydraulic excavator as an example.

Reference numeral 1 denotes a lower traveling body of the hydraulic excavator, 2 denotes an upper revolving body which is mounted on the lower traveling body 1 so as to be rotatable. On the front side of the upper revolving body 2, for example, excavation work of earth and sand or the like. In order to perform the above, a work device 3 including a boom 3A, an arm 3B, a bucket 3C, and the like is attached so as to be able to move downward.

Reference numeral 4 denotes a revolving frame which constitutes a supporting portion of the upper revolving structure 2, and the revolving frame 4 has a center frame and side frames (not shown) arranged on both left and right sides of the center frame. A bracket portion 4A is provided on the front side of the center frame, which is formed as a skeleton structure. Further, on the revolving frame 4, a counterweight 5, an engine 6, a hydraulic pump 7, a building cover 13, which will be described later,
A muffler device 21 and the like are provided.

Reference numeral 5 is a counterweight provided on the rear end side of the revolving frame 4 for balancing the weight of the working device 3. The counterweight 5 is formed in a substantially arc shape so as to surround the engine 6 from the rear. ing.

Reference numeral 6 denotes an engine provided on the front side of the counterweight 5 and provided on the rear side of the revolving frame 4, and the engine 6 is arranged in a horizontally placed state extending leftward and rightward as shown in FIG. The hydraulic pump 7 is attached to the left side of the engine 6 and the radiator 8 is provided to the right side of the engine 6. An air cleaner 9 and a muffler device 21 located on the left side of the air cleaner 9 are attached to the upper side of the engine 6, and the muffler device 21 is connected to an exhaust pipe 6A of the engine 6.

A driver's seat 10 is provided on a floor plate 11 which is located in front of the engine 6 and covers the revolving frame 4. The driver's seat 10 is covered from above by a canopy 12 as shown in FIG.

Reference numeral 13 denotes a building cover provided on the revolving frame 4 as an outer shell of the upper revolving structure 2. The building cover 13
Covers various equipment including the engine 6, the hydraulic pump 7, the radiator 8, the air cleaner 9, the muffler device 21 and the like from the outside. Further, a portion of the building cover 13 that faces the equipment such as the engine 6 is formed so as to be openable / closable in order to perform maintenance work on these equipment.

Reference numeral 21 is a muffler device connected to the exhaust pipe 6A for reducing the exhaust sound of the engine 6. The muffler device 21 has a muffling member (not shown) inside, as shown in FIGS. The muffler main body 22 is provided, and includes a heat insulating sheet 24, an aluminum sheet 31, and a strip-shaped mounting metal fitting 32, which will be described later.

Here, the muffler main body 22 is formed as a hollow cylindrical body whose both sides in the length direction are closed, and one end of the muffler main body 22 is connected to the exhaust pipe 6A of the engine 6 at the inflow side pipe portion 22A. Is projected. Further, on the other end side of the muffler main body 22, an outflow side pipe portion 22B extending toward the outside of the building cover 13 is provided in a protruding manner.

A bracket 23 made of, for example, a metal plate is provided on the upper side of the engine 6 with a plurality of mounting screws 23A.
The bracket 23 fixes the muffler device 21 to the upper side of the engine 6 by tightening the bracket 23. in this case,
The bracket 23 has a muffler device 21 protruding upward.
Is provided with a supporting portion 23B for supporting the.

Reference numeral 24 is a heat insulating sheet formed of a heat insulating material, and the heat insulating sheet 24 is formed as a flexible and thick sheet member made of, for example, a foaming material containing glass fiber or the like. As shown in FIGS. 4 and 6, the heat insulating sheet 24 is provided between the tube end sheet portions 25 and 26 covering one end side and the other end side in the length direction of the muffler main body 22, and between the tube end sheet portions 25 and 26. And the intermediate sheet portion 27 that covers the longitudinal intermediate portion of the muffler main body 22 and the end surfaces of the tube end sheet portions 25 and 26 by means such as adhesion, and at a position surrounding the pipe portions 22A and 22B. Muffler body 2
It is composed of annular end face sheet portions 28 and 29 that cover the end face of No. 2, and these are formed as divided sheets that cover the muffler main body 22 at three divided positions in the longitudinal direction.

In this case, the tube end sheet portions 25, 26 and the intermediate sheet portion 27 are formed in a tube shape with both ends open, and are fitted to the outer peripheral side of the muffler body 22 and at the same time, these sheet portions 25, 26. , 27, an annular gap is formed in which the muffler body 22 is exposed, as shown in FIG. These gaps are arranged in the longitudinal direction of the muffler main body 22 with a gap therebetween, and are two muffler mounting gaps 30 to which the band-shaped mounting fittings 32 are mounted.

Reference numeral 31 denotes an aluminum sheet covered with, for example, a thin film of aluminum, and the aluminum sheet 31 is made of a thin flexible sheet member as shown in FIG. 7, and is fixed to the heat insulating sheet 24 by means of adhesion or the like. Has been done. The aluminum sheet 31 has a cylindrical outer peripheral cover portion 31A that covers the heat insulating sheet 24 and the muffler mounting gap 30 from the outside in the radial direction, and an annular end surface cover portion 31B that covers the end surface sheet portions 28 and 29 of the heat insulating sheet 24. ，
And 31B.

Here, the outer peripheral cover portion 31A is flexibly deformed in a concave shape along each muffler mounting gap 30, and a band-shaped mounting metal fitting 32 is attached to the flexurally deformed portion. The aluminum sheet 31 covers the entire surface of the muffler main body 22 from the outside of the heat insulating sheet 24, and cooperates with the heat insulating sheet 24 to prevent the worker from coming into contact with the hot muffler main body 22 during maintenance work such as the engine 6. To prevent it.

Reference numeral 32 is a band-like mounting metal fitting for fixing the muffler main body 22 to the bracket 23, for example as two mounting tools.
As shown in FIGS. 5 and 8, each of the strip-shaped mounting members 32 is formed as a flexible strip-shaped member made of, for example, a thin metal plate, and male threads are formed on the outer peripheral side at both ends thereof. The threaded rods 32A, 32A are fixed by means such as welding.

The band-shaped mounting member 32 is disposed in the muffler mounting gap 30 at its intermediate portion in the lengthwise direction, and is flexibly deformed in the gap 30 to extend from the outer side of the aluminum sheet 31 to the outer periphery of the muffler body 22. It is wound in an arc shape along. Further, each threaded rod 32A of the strip-shaped mounting member 32 is fastened to the bracket 23 by using, for example, two nuts 33 or the like. As a result, each strip-shaped mounting member 32 supports the muffler body 22 between itself and the support portion 23B of the bracket 23, and cooperates with the bracket 23 to fix the muffler body 22 to the engine 6.

The hydraulic excavator according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, when the engine 6 is operated during the operation of the hydraulic excavator, the hydraulic pump 7 is driven, and the traveling motor, the swing motor (not shown) and the hydraulic cylinders of the working device 3 mounted on the vehicle are driven. The hydraulic oil is supplied from the hydraulic pump 7. This allows the operator of the hydraulic excavator to drive the vehicle, rotate the upper-part turning body 2, and actuate the work device 3 to perform excavation work of earth and sand.

Further, for example, when performing maintenance work on the engine 6 or the like, a part of the building cover 13 is opened and various equipment including the engine 6 is inspected. in this case,
A muffler device 21 is attached to the upper side of the engine 6, but the muffler body 22 is entirely shielded by a heat insulating sheet 24 and an aluminum sheet 31.
Therefore, for example, even immediately after the engine 6 is stopped, it is possible to prevent an operator or the like from accidentally coming into contact with the high temperature muffler body 22, and it is possible to safely perform various maintenance work.

Next, the assembling and mounting work of the muffler device 21 will be described with reference to FIGS.

First, in the assembling work of the muffler device 21, as shown in FIG. 6, the heat insulating sheet 2 is attached to the muffler body 22.
4, the cylinder end sheet portions 25 and 26, the intermediate sheet portion 27, and the end face sheet portions 28 and 29 are attached. In this case, the tube end sheet portions 25, 26 and the end surface sheet portions 28, 29 may be integrated in advance by means such as adhesion. After the heat insulating sheet 24 is attached, the muffler body 22 is covered with the heat insulating sheet 24 except for the two exposed portions at the respective muffler attaching gaps 30.

Next, as shown in FIG. 7, the outer peripheral cover portion 31A of the aluminum sheet 31 is wound around the muffler main body 22 from the outside of the heat insulating sheet 24, and the outer peripheral cover portion 31A is wound.
Is fixed to the outer peripheral side of the heat insulating sheet 24, and each end surface cover portion 31B of the aluminum sheet 31 is fixed to the end surface sheet portions 28 and 29 of the heat insulating sheet 24.

Then, on the outer peripheral side of the muffler main body 22, as shown in FIG. 8, a strip-shaped mounting metal fitting 32 is wound from the outside of the aluminum sheet 31 at the position of each muffler mounting gap 30, and its threaded rod 32A is attached. Tighten the bracket 23 on the engine 6 side. As a result, the muffler body 22 is
The muffler device 21 can be stably attached to the engine 6 side because the muffler device 21 is fixed between the strip-shaped mounting member 32 and the support portion 23B of the bracket 23 at two positions in the length direction.

Thus, according to the present embodiment, the heat insulating sheet 24 forming the muffler mounting gap 30 is provided on the outer surface side of the muffler main body 22, and the muffler mounting gap 3 is provided.
Since the band-shaped mounting member 32 is wound from the outside of the aluminum sheet 31 at the position 0, the muffler main body 22 is formed by the tube end sheet portions 25, 26, the intermediate sheet portion 27, and the end face sheet portions 28, 29 of the heat insulating sheet 24. Can be covered at three divided positions in the length direction.

As a result, when the muffler device 21 is assembled, only the sheet portions 25 to 29 of the heat insulating sheet 24 are attached to the muffler body 22, and the two muffler attachment gaps 30 are provided.
Can be formed at an accurate position, and it is not necessary to cut the heat insulating material as in the prior art, and the assembling work can be performed efficiently. Further, since the heat insulating sheet 24 has the end face sheet portions 28 and 29, it is possible to cover the entire surface of the muffler main body 22 except for the position of the muffler mounting gap 30, and to improve the heat insulating performance thereof.

Further, since the aluminum sheet 31 can cover the entire surface of the muffler main body 22 from the outside of the heat insulating sheet 24 including the position of the muffler mounting gap 30, the heat insulating sheet 24 and the heat insulating sheet 24 can be used during the maintenance work of the engine 6 and the like. With the aluminum sheet 31, the muffler body 22 can be reliably shielded from an operator or the like. Moreover, foreign matter such as dust and water can be prevented from coming into contact with the muffler body 22 from the outside of the aluminum sheet 31, and the muffler body 22 can be protected from the foreign matter by a simple shielding structure and its durability and life can be increased. You can further,
Since the end surface and the like of the heat insulating sheet 24 can be covered with the aluminum sheet 31, the appearance can be improved.

Further, since the muffler mounting gaps 30 are provided at two positions separated from each other in the longitudinal direction of the muffler body 22, the strip-shaped mounting metal fittings 32 are provided with thin aluminum sheets 31 at the respective muffler mounting gaps 30. The muffler main body 22 can be stably supported via this. In this case, since it is not necessary to wind the strip-shaped mounting bracket 32 around the outer peripheral side of the heat insulating sheet 24, even if the thickness of the heat insulating sheet 24 changes due to vibration, deterioration over time, etc., the strip-shaped mounting bracket 32. Can be prevented, and the muffler main body 22 can be attached to the bracket 23 on the engine 6 side in a good condition for a long period of time.

Moreover, since the band-shaped mounting member 32 is formed as a band-shaped member from a flexible metal plate or the like, and the threaded rod 32A provided on the end side thereof is fastened to the bracket 23, the muffler main body 22 has Since it is not necessary to provide a special leg portion or the like for mounting on the bracket 23 side, the mounting structure can be simplified, and the mounting work of the muffler main body 22 can be easily performed by flexibly deforming the band-shaped mounting bracket 32. .

In the above embodiment, the muffler body 2
2 is covered with the heat insulating sheet 24 at a position divided into three in the length direction, but the present invention is not limited to this, and the heat insulating sheet may be divided into two in the length direction of the muffler main body 22. Alternatively, it may be divided into a plurality of four or more.

That is, for example, as in the first modification shown in FIG. 9, the heat insulating sheet 42 of the muffler device 41 is divided into two in the length direction by the tube end sheet portions 43 and 44 and the end face sheet portions 45 and 46. It is also possible to form one muffler mounting gap 47 between them and to wind one strip-shaped mounting metal fitting 32 ′ arranged in this gap 47 around the muffler main body 22.

Further, as in the second modification shown in FIG. 10, the heat insulating sheet 52 of the muffler device 51 is attached to the tube end sheet portion 5.
3, 54, the intermediate sheet portions 55 and 56, and the end face sheet portions 57 and 58 are formed by being divided into four in the lengthwise direction, and three muffler mounting gaps 59 are formed between these and the respective gaps 59 are formed. It is also possible to wind the muffler main body 22 with the three strip-shaped mounting fittings 32 arranged at.

Further, as in the third modification shown in FIG. 11, the heat insulating sheet 62 of the muffler device 61 is attached to the muffler body 2
2 is constituted by bottomed tubular end face / cylindrical end sheet portions 63 and 64 that cover both sides in the length direction and the end face, and a tubular intermediate sheet portion 65 that covers the longitudinal intermediate portion of the muffler body 22. Good.

On the other hand, in the embodiment, the fitting is made of the thin metal plate as the band-shaped fitting 32, but the present invention is not limited to this, and is, for example, a fourth modification shown in FIGS. 12 and 13. In addition, as a fixture used for the muffler device 71,
The clamp ring 72 formed of a rigid metal material may be used. In this case, in the clamp ring 72, substantially arc-shaped half-split bodies 72A, 72A are rotatably connected by a connecting pin 72B, and these half-split bodies 7 are
The diameter is expanded by opening 2A and 72A in the left and right directions in FIG. 13, and is decreased by closing the half-split body 72A. Then, the clamp ring 72 attaches the muffler body 22 to the muffler mounting gap 3 by each half body 72A.
It is clamped from the left and right sides at the position of 0, and its end side is attached to the bracket 23 using bolts 73 and the like.

As a result, the muffler body 22 can be supported by the clamp ring 72 in the upward, downward, left, and right directions,
The support portion 23B on the bracket 23 side can be omitted, and at the time of mounting the muffler device 71, the clamp ring 72 can be easily wound around the outer peripheral side of the muffler body 22 by expanding and contracting the halves 72A. can do.

Further, in the embodiment, the band-shaped mounting member 32 is used as the mounting member, but the present invention is not limited to this, and the mounting member is composed of, for example, a flexible band-shaped resin material or the like. Good. Then, in this case, for example, an engaging means composed of a hook-shaped hook, an engaging hole, or the like may be provided on the end side of the fixture, and the engaging means may be locked to the bracket 23 side.

Further, in the embodiment, the muffler device 21
Was described by taking the case of applying to a hydraulic excavator as an example.
The present invention is not limited to this, and it is needless to say that the present invention can be applied to other construction machines such as hydraulic cranes and wheel loaders, and various machines such as agricultural machines and automobiles.

[0054]

As described in detail above, according to the first aspect of the invention, the muffler main body has the structure in which the fixture is wound from the outside of the aluminum sheet at the position of the muffler attachment gap of the heat insulating sheet. At the time of assembling the muffler device, the muffler mounting gap can be formed at an accurate position by simply disposing each of the divided sheets of the heat insulating sheet on the muffler body, and the assembling work can be easily performed. Also, since the aluminum sheet can cover the entire surface of the muffler body from the outside of the heat insulating sheet, it can reliably shield the muffler body that becomes hot and protect the muffler body from external foreign matter, etc. And life can be increased. Then, the fixture can stably support the muffler main body through the thin aluminum sheet at the positions of the muffler mounting gaps arranged at a plurality of positions in the length direction, and is provided on the main body side of the vehicle, machine, etc., for example. The muffler body can be attached to the bracket in good condition for a long period of time.

Further, according to the invention of claim 2, since the heat insulating sheet is configured to cover not only the outer peripheral surface of the muffler body but also the end surface, the entire surface of the muffler body is covered by the heat insulating sheet except for the position of the muffler mounting gap. It can be covered and its thermal insulation performance can be enhanced.

According to the third aspect of the invention, the fitting is formed of a flexible band-shaped material or a clamp material having expandability, and the lengthwise intermediate portion is wound around the outer peripheral side of the muffler body. Since both ends are attached to the bracket side, for example, when the attachment is formed of a band-shaped material, the attachment can be flexibly deformed and easily wound around the outer peripheral side of the muffler body. Further, when the attachment is made of a clamp material, it can be easily wound around the outer periphery of the muffler body by expanding or reducing the diameter of the attachment. Therefore, the muffler body can be efficiently attached to the bracket side using these attachments. Further, it is not necessary to provide a special leg portion or the like on the muffler body, and the mounting structure thereof can be simplified.

[Brief description of drawings]

FIG. 1 is a front view showing a hydraulic excavator to which a muffler device according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged plan view of a hydraulic excavator showing a rear side of an upper revolving structure in a cutaway manner.

FIG. 3 is a perspective view showing a muffler device attached to the upper side of the engine.

FIG. 4 is a partially cutaway front view of the muffler device according to the embodiment of the present invention.

5 is a cross-sectional view of the muffler device as seen from the direction of arrows VV in FIG.

FIG. 6 is a perspective view showing a state in which a heat insulating sheet is attached to the muffler body.

FIG. 7 is a perspective view showing a state where an aluminum sheet is attached to the muffler body from the outside of the heat insulating sheet.

FIG. 8 is a perspective view showing a state in which the muffler device is attached to a bracket on the engine side using a band-shaped attachment fitting.

FIG. 9 is a front view showing a muffler device according to a first modification of the present invention.

FIG. 10 is a front view showing a muffler device according to a second modification of the present invention.

FIG. 11 is a perspective view showing a muffler device according to a third modification of the present invention in a state similar to that of FIG.

FIG. 12 is a front view showing a muffler device according to a fourth modification of the present invention.

13 is a cross-sectional view of the muffler device as seen from the direction XIII-XIII in FIG.

FIG. 14 is a partially cutaway front view showing a conventional muffler device.

15 is a cross-sectional view of the muffler device as seen from the XV-XV direction in FIG.

[Explanation of symbols]

1 Lower Traveling Body 2 Upper Revolving Body 4 Revolving Frame 5 Counterweight 6 Engine 6A Exhaust Pipe 13 Building Cover 21, 41, 51, 61, 71 Muffler Device 22 Muffler Main Body 22A, 22B Piping 23 Bracket 23A Mounting Screw 23B Support 24 , 42, 52, 62 Insulation sheet 25, 26, 43, 44, 53, 54 Tube end sheet portion (divided sheet) 27, 55, 56, 65 Intermediate sheet portion (divided sheet) 28, 29, 45, 46, 57 , 58 End face sheet portion (divided sheet) 30, 47, 59 Muffler mounting gap 31 Aluminum sheet 31A Outer peripheral cover portion 31B End face cover portion 32, 32 'Belt-shaped mounting bracket (mounting tool) 32A, 32A' Threaded rod 63, 64 End face / Cylinder end sheet part (split sheet) 72 Clamp ring (mounting tool)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16B 35/00 F16B 35/00 B (72) Inventor Kenichiro Nakatani 1-Sasagaoka, Mizuguchi-cho, Koga-gun, Shiga Prefecture 2 Inside Hitachi Construction Machinery Tierra Shiga Factory (72) Inventor Osamu Kokuryo 1-2 Sasagaoka, Mizuguchi-cho, Koga-gun, Shiga Prefecture Inside Hitachi Construction Machinery Tierra Shiga Factory (72) Inventor Fumimasa Saeki Shiga 1-2 Sasagaoka, Mizuguchi-machi, Koga-gun, Shizuoka F-term in Hitachi Construction Machinery Tierra Shiga factory (reference) 2D015 CA02 CA03 3G004 AA01 AA03 AA04 BA00 DA11 DA15 DA21 EA05 FA06

Claims (3)

[Claims] 1. A muffler body, which is formed as a cylindrical body whose both sides in the lengthwise direction are closed and is provided with a sound deadening member therein, and an outer peripheral surface of the muffler body, which is formed as a plurality of divided sheets of a heat insulating material. A heat insulating sheet which is divided into a plurality of pieces in the lengthwise direction and which is formed between the divided sheets to form a muffler mounting gap in which the outer peripheral surface of the muffler body is exposed, and a heat insulating sheet formed of a flexible sheet material. An aluminum sheet that covers the muffler body from the outside of the heat insulating sheet including the muffler mounting gap, and a bracket side that is wound around the muffler body from the outside of the aluminum sheet at the position of the muffler mounting gap of the heat insulating sheet. A muffler device composed of a mounting tool that can be mounted. 2. The muffler device according to claim 1, wherein the heat insulating sheet covers not only the outer peripheral surface of the muffler body but also the end surface. 3. The mounting member is formed of a flexible band-shaped material or a clamp material having expandability, and both ends thereof are wound in a state where an intermediate portion in the length direction is wound around the outer peripheral side of the muffler body. The muffler device according to claim 1 or 2, wherein the muffler device is configured to be mounted on the bracket side.