JP2002105984A - Structure with sound absorbing member stuck thereon of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure with a sound absorbing member stuck on a construction machine intended to improve exchangeability in case of changing the sound absorptive member due to the secular deterioration and recyclability of respective constituents. SOLUTION: In the sticking structure for a sound absorptive member of a construction machine in which it is stuck on the inside face of an engine room covering instruments such as the engine and the like, the sound absorptive member is stuck on the indoor face of the engine room through a film sheet made of polyester based resin, polyvinyl chloride.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine typified by a hydraulic excavator or the like, and more particularly to a structure for attaching a sound absorbing material to an engine room in which equipment such as an engine is mounted.

[0002]

2. Description of the Related Art A hydraulic excavator will be described below as an example of a construction machine with reference to the drawings. FIG. 5 is a side view showing a general hydraulic excavator. In the figure, reference numeral 50 denotes a hydraulic excavator. The hydraulic excavator 50 includes a lower traveling body 51 which can travel freely, an upper revolving body 52 which is rotatably mounted on an upper portion of the lower traveling body 51, and an upper revolving body Attachment 53 mounted on the front end of 52 so as to be able to lie freely.

The upper swing body 52 is provided with a counter weight 55 at its rear end for keeping balance with the attachment 53. An operator's cab 54 is provided on one side of the front part where the operator gets on. Also,
On the upper swing body 52, between the operator's cab 54 and the counterweight 55, equipment such as an engine is mounted, and is covered with an outer cover 56 and the like. A sound absorbing material described later is attached to the inner surface of the outer cover 56.

Next, a conventional sound absorbing material attaching structure will be described with reference to the drawings. FIG. 6 is a detailed view of a main part showing a conventional structure for attaching a sound absorbing material to an exterior cover. FIG. 7 is a view showing an AA cross section of FIG. The exterior cover 56 shown in the figure is formed by processing a steel plate made of a single plate by press molding or the like and extruding the hydraulic excavator 50.
Is formed so as to form a part of the external shape. A pair of hinges 57 are provided on the inner side surface 56a of the outer cover 56 near one side end. On the other side of the exterior cover 56, the exterior cover 56 is
A hole 58 for attaching a not-shown locking means that can be locked with respect to is provided. The exterior cover 56 is set to be freely openable and closable with the hinge 57 as a rotation center axis, and is configured to perform maintenance of devices such as an engine when opened.

[0005] A sound absorbing material 59 is applied to the inner side surface 56a of the outer cover 56 to attenuate and absorb the transmitted energy of noise generated from equipment such as an engine. The sound absorbing material 59 is formed of a resin foam such as urethane foam, and is configured to be attached to the inner surface 56a by a double-sided tape 60 with an adhesive. The sound absorbing material 59 is
In addition to the exterior cover 56, it is appropriately affixed to the inside of the engine room such as the front surface of the counterweight 55.

[0006]

If the above-mentioned sound absorbing material is attached to an engine room for accommodating an engine or the like which is one of the noise sources, the sound absorbing material can reduce noise generated from the engine or the like. Since transmitted energy can be attenuated and absorbed, sound leaking to the outside can be reduced. Therefore, even at night or the like, it becomes possible to perform excavation work or the like by the construction machine without worrying about the surroundings.

In the meantime, many vents are formed in the surface of the engine room for heat radiation and the like. Although this vent effectively acts on the heat radiation of the engine, there is a problem that rainwater or the like infiltrates into the engine compartment. The sound absorbing material is formed of a resin foam, such as urethane foam, which is a material that easily absorbs water, and easily absorbs the above-mentioned rainwater. When such a sound absorbing material absorbs water, the humidity inside the engine compartment rises, and the interior of the engine compartment is originally high in temperature due to the heat of the engine, so that a high temperature and high humidity state results. If this state continues for a long time, the aging of the sound absorbing material is accelerated, the sound absorbing performance is significantly reduced, and the appearance is also deteriorated. In this case, the sound absorbing material must be replaced,
The above-mentioned conventional sound absorbing material sticking structure has the following problems.

That is, in the prior art, replacement of the sound absorbing material has not been considered so much, and as described above, the resin foam was directly attached to the exterior cover or the like using a double-sided tape. In this case, since the resin foam is weaker than the adhesive strength of the double-sided tape due to its structure, when the resin foam is pulled to remove the sound absorbing material from the outer cover, the resin foam is broken first and the resin foam is fired. There was a problem that fragments of the body, double-sided tape, etc. remained on the outer cover and could not be completely removed. In such a state where the old sound absorbing material remains partially,
Since the adhesiveness of the new sound absorbing material is reduced, it is necessary to completely remove the old sound absorbing material.However, it is very difficult to completely remove the resin foam and adhesive, etc., which remain in pieces. Was. In addition, when disposing of construction machinery, it has been desired in recent years to classify each component of the construction machine for each material and to recycle it. However, it is difficult to peel off the above-described sound absorbing material. It was very troublesome to make the outer cover and the like recyclable.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a construction machine which has improved exchangeability when replacing a sound absorbing material due to aging and the like, and improved recyclability of each component. An object of the present invention is to provide a sound absorbing material attaching structure.

[0010]

According to a first aspect of the present invention, in a structure for attaching a sound-absorbing material of a construction machine attached to an engine room surface covering equipment such as an engine, a polyester resin material is provided on the engine room surface. The sound absorbing material is attached via a film sheet made of, for example, vinyl chloride.

According to this, since the film sheet is less likely to break than the sound absorbing material, the film sheet and the sound absorbing material can be integrally peeled off from the interior of the engine compartment. There is no need to worry about the cut sound absorbing material remaining on the inner surface of the engine room, and it is possible to omit extra work such as removing the remaining debris, so that it is possible to improve exchangeability when the sound absorbing material is deteriorated. This is also effective for replacing the sound absorbing material at the time of resale of a used car. In addition, it also leads to improvement in recyclability of parts constituting the engine room such as an exterior cover.

According to a second aspect of the present invention, in the structure for attaching a sound absorbing material of a construction machine according to the first aspect, a part of the film sheet to which the sound absorbing material is attached is exposed and gripped when the film sheet is peeled off. It is characterized by having a grip portion.

In this case, since the film sheet can be reliably gripped by the gripping portion, there is no fear that the sound absorbing material is gripped by the sound absorbing material and the fine dust is not generated as in the conventional case. Thus, the exchange efficiency is improved.

According to a third aspect of the present invention, in the structure for attaching a sound absorbing material of a construction machine to be attached to an engine room surface covering equipment such as an engine, the sound absorbing material is attached to a thin flat plate, and A fitting portion is provided for fitting the flat plate in an elastically deformed state.

According to this structure, the flat plate is attached to the interior of the engine compartment by using the returning force generated by the elastic deformation, so that the sound absorbing material can be attached without requiring an adhesive material or the like. Can be mounted very easily. In addition, even when the sound absorbing material is replaced, no extra work such as removal of the adhesive material is required, which leads to a reduction in replacement time.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a structure for attaching a sound absorbing material according to a first embodiment of the present invention. FIG.
FIG. 2 is a detailed view of a main part showing the sound absorbing material attaching structure according to the first embodiment of the present invention. 2A is a view showing a cross section taken along line BB in FIG. 1, and FIG. 2B is a view showing a state in which the sound absorbing material in FIG. 2A is removed. The components having the same configuration as the prior art are denoted by the same reference numerals, and description thereof will be omitted.

As shown in the figure, in the present invention, a film sheet 2 made of a polyester resin material, vinyl chloride or the like is provided between an inner surface 56a of an outer cover 56 and a sound absorbing material 59.
, The sound absorbing material 59 is attached to the inner surface 56 of the outer cover 56.
a. Adhesives 3 and 4 are applied to both surfaces of the film sheet 2, and a sound absorbing material 59 is attached to one surface thereof, and the other surface is attached to an inner surface 56 a of the outer cover 56. Further, the film sheet 2 is formed to be about 5 to 10 mm larger than the outer shape of the sound absorbing material 1, and has an ear 2 a which is a grip portion protruding from the sound absorbing material 1.
9 is configured so that the operator can easily grip the film sheet 2 when replacing the film sheet 9.

FIG. 2 shows a method of replacing the sound absorbing material 59.
Explaining with reference to (b), when replacing the sound absorbing material 59, the operator holds the ear 2a of the film sheet 2 and
The film sheet 2 is pulled in a direction in which the film sheet 2 is peeled off from the outer cover 56 (arrow a). According to this, the film sheet 2
The film sheet 2 and the sound absorbing material 59 can be peeled off from the outer cover 56 integrally because the sound absorbing material 59 is hard to break as compared with the sound absorbing material 59. Since there is no need to worry about remaining on the exterior cover 56 and unnecessary labor for removing the remaining debris can be omitted, the exchangeability when the sound absorbing material is deteriorated can be improved. This is also effective for replacing the sound absorbing material at the time of resale of a used car. In addition, it also leads to improvement in recyclability of parts constituting the engine room such as an exterior cover.

In the above-described present invention, the case where the ear 2a of the film sheet 2 is provided around the sound absorbing material 59 has been described as an example. However, the present invention is not limited to this, and only one side of the sound absorbing material 59 is provided. Any structure can be applied as long as the film sheet 2 can be easily peeled off, such as providing an ear portion, providing an ear portion at one corner of the sound absorbing material 59, or switching a part of the sound absorbing material 59.

Here, the inner surface 5 of the outer cover 56 is used.
Although the case where the sound absorbing material 59 is attached to 6a has been described,
The present invention is not limited to this, and any sound absorbing material 59 attached to a surface forming an engine room, such as the front surface of a counterweight, is applicable. Also, the shape of the sound absorbing material 59 is not limited to the rectangular parallelepiped shown in the figure, and may be any shape. in this case,
The shape of the film sheet 2 may be appropriately changed according to the shape of the sound absorbing material.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a main part detailed view showing a sound absorbing material attaching structure according to a second embodiment of the present invention. FIG. 4 shows C in FIG.
It is a figure which shows the -C cross section.

In the figure, the outer cover 10 is formed in a substantially arc shape with a radius R, for example, whose outer cross section is curved outward so as to conform to the external shape of the machine. At the upper and lower positions of the inner surface 10a of the outer cover 10, fixed portions 15, 16 protruding to support a flat plate 12, which will be described later, are provided extending horizontally in the left-right direction (fitting portions).

The sound absorbing material 59 is attached to the thin flat plate 12 having a thickness of about 0.5 to 1 mm. The flat plate 12 has bent portions 13 and 14 formed at upper and lower ends thereof by being bent toward the sound absorbing material 59, and the fixed portions 15 and 16.
It is set wider than the interval between them.

The structure for attaching the flat plate 12 to the exterior cover 10 will be described.
In order to fit between the two fixed portions 15 and 16, they are curved outward in advance so as to reduce the width in the vertical direction. In this state, when the flat plate 12 is fitted between the fixing portions 15 and 16, the outer surface of the flat plate 12 is substantially in line with the inner surface 10 a of the outer cover 10 due to a force of the flat plate 12 to return to its elastic deformation. After that, the bent portions 13 and 14 of the flat plate 12 and the fixing portions 15 and 16 of the outer cover 10 come into contact with each other and cannot return to the original shape. As described above, since the force for returning the elastic deformation always acts on the flat plate 12, the flat plate 12 can be fixed to the outer cover 10 without the need of an adhesive or the like. Therefore, the work of attaching the sound absorbing material 59 can be performed very easily. Also,
Even when the sound absorbing material 59 is replaced, the sound absorbing material 59 can be removed from the fixed portions 15 and 16 simply by pulling the bent portions 13 and 14 of the flat plate 12, so that the sound absorbing material 59 can be replaced very easily. Exchange efficiency is improved.

Here, the flat plate 12 is attached to the outer cover 1.
A description has been given of the structure in which the outer cover 10 is elastically deformed so as to conform to the outer shape of the outer cover 10. However, the present invention is not limited to this. It is good also as a structure which forms a part. In addition, this structure is not limited to the exterior cover 10 and may be any location on the inner surface of the engine compartment as long as the present invention can be realized.

[0026]

According to the first aspect of the present invention, the film sheet is less likely to break than the sound absorbing material, so that the film sheet and the sound absorbing material can be integrally peeled off from the engine room surface. As described above, there is no need to worry about the shredded sound absorbing material remaining on the inner surface of the engine when peeling off, and it is possible to omit extra work such as removing the remaining debris, thereby improving the exchangeability when the sound absorbing material is deteriorated. be able to. This is also effective for replacing the sound absorbing material at the time of resale of a used car. In addition, when the construction machine is discarded, the sound absorbing material can be easily separated, which leads to an improvement in recyclability of parts in the engine room such as the outer cover.

According to the second aspect of the present invention, since the film sheet can be reliably gripped by the gripping portion, there is no worry that the sound absorbing material is gripped by the conventional sound absorbing material and the sound absorbing material is broken. There is no worry about garbage. Thus, the exchange efficiency is improved.

According to the third aspect of the present invention, since the flat plate is mounted on the inner surface of the engine compartment by using the returning force generated by the elastic deformation, the sound absorbing material can be mounted without the need for an adhesive material or the like. The work of mounting the sound absorbing material can be performed very easily. In addition, even when the sound absorbing material is replaced, no extra work such as removal of the adhesive material is required, which leads to a reduction in replacement time.

[Brief description of the drawings]

FIG. 1 is a detailed view of a main part showing a sound absorbing material attaching structure according to a first embodiment of the present invention.

2A is a view showing a cross section taken along line BB in FIG. 1, and FIG. 2B is a view showing a state in which a sound absorbing material is removed in FIG. 2A.

FIG. 3 is a main part detailed view showing a sound absorbing material attaching structure according to a second embodiment of the present invention.

FIG. 4 is a view showing a cross section taken along line CC in FIG. 3;

FIG. 5 is a side view showing a general hydraulic excavator.

FIG. 6 is a main part detailed view showing a conventional structure for attaching a sound absorbing material to an exterior cover.

FIG. 7 is a diagram showing a cross section taken along the line AA of FIG. 6;

[Explanation of symbols]

 2: film sheet 2a: ears 10, 56: exterior cover 12: flat plate 59: sound absorbing material

Claims (3)

[Claims] 1. A sound-absorbing material attaching structure for a construction machine which is attached to an engine room surface covering devices such as an engine, wherein the sound absorbing material is attached to the engine room surface via a film sheet made of a polyester resin material, vinyl chloride or the like. A sound-absorbing material attaching structure for construction equipment, characterized by having attached thereto. 2. A sound absorbing material attachment for a construction machine according to claim 1, further comprising a holding portion for exposing a part of the film sheet to which the sound absorbing material is attached, and holding the film sheet when the film sheet is peeled off. Construction. 3. A sound absorbing material sticking structure of a construction machine stuck to an engine room surface covering equipment such as an engine, wherein the sound absorbing material is stuck to a thin flat plate, and the flat plate is elastically deformed to the engine room surface. A structure for attaching a sound absorbing material to a construction machine, comprising a fitting portion fitted in a state.