JP2007063804A - Sound absorbing structure of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorbing structure of a working machine which can suppress the separation of a sound absorbing material from a mounting object surface. <P>SOLUTION: This sound absorbing structure of the working machine has the sound absorbing material 7 the preset mounting surface 7E of which is attached on the top surface 5c of the working machine 1. The sound absorbing structure of the working machine is also equipped with reinforcing tapes 8 which are stuck on the side surfaces 7A and 7B of the sound absorbing material 7 raised from an edge of the mounting surface 7E, respectively. The reinforcing tapes 8 are stuck astride the side surfaces 7A and 7B and the top surface 5c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technology of a sound absorbing material provided in a work machine such as a hydraulic excavator.

  As the sound absorbing material, a material provided on a cover of an engine room of a work machine is known (for example, Patent Document 1).

This type of sound absorbing material is formed of foamed urethane or the like, and is joined to the inner surface of the cover (surface to be attached) via an adhesive.
JP 2000-17687 A

  However, many of the sound absorbing materials are easily peeled off from the surface to be attached although they are bonded with an adhesive.

  There are various factors for this peeling. For example, when a sound-absorbing material is provided in the engine compartment as in Patent Document 1, there is an influence of wind by a cooling fan of the engine. That is, the sound absorbing material of Patent Document 1 is gradually peeled off from the edge by receiving the wind of the cooling fan, and the entire sound absorbing material may be peeled off from the surface to be attached.

  This invention is made | formed in view of the said subject, and aims at providing the sound-absorbing structure of the working machine which can suppress peeling of the sound-absorbing material from the attachment object surface.

  In order to solve the above-mentioned problem, the present invention provides a sound absorbing structure for a work machine having a sound-absorbing material attached to a mounting target surface of a work machine, wherein the preset mounting surface rises from an edge of the mounting surface. A sound absorbing structure for a working machine, comprising a reinforcing tape attached to at least a part of a side surface of the sound absorbing material, the reinforcing tape being attached across the side surface and the surface to be attached. I will provide a.

  According to the present invention, it is possible to prevent the edge of the mounting surface from floating from the mounting target surface by sticking the reinforcing tape across the side surface of the sound absorbing material and the mounting target surface. It can suppress that the edge part of an attachment surface peels from the attachment object surface.

  In the present invention, the mounting area of the sound absorbing material to the mounting target surface can be increased by the amount of the sticking area of the reinforcing tape, so that the sound absorbing material can be securely fixed to the mounting target surface rather than simply mounting the sound absorbing material. The secondary effect of being able to do this can also be achieved.

  Therefore, in this invention, peeling of the sound-absorbing material from the attachment target surface can be suppressed.

  The attachment target surface can be appropriately set based on the arrangement of the sound source to be sound-absorbed, but the attachment target surface is set in the engine compartment, and the reinforcing tape is at least the cooling fan for the engine It is preferably attached to the side surface of the sound-absorbing material that is disposed so as to face the wind direction of the cooling fan.

  According to this configuration, since the reinforcing tape is attached to the side surface of the sound absorbing material disposed so as to intersect with the wind direction of the cooling fan, the reinforcing tape attached over the side surface and the attachment target surface. Thus, it is possible to prevent the movement of the edge portion of the mounting surface that tends to float from the side surface of the cooling fan that receives the wind. Therefore, according to this structure, the movement of the edge part of the attachment surface used as a trigger of peeling of a sound absorption material can be suppressed.

  Further, in this configuration, the boundary portion between the attachment surface and the attachment target surface can be covered with the reinforcing tape and the wind of the cooling fan can be prevented from entering the boundary portion. It is possible to suppress the boundary portion from being expanded and the edge of the mounting surface from being lifted. Therefore, it is possible to suppress the peeling of the sound absorbing material triggered by the lifting of the edge.

  In the sound absorbing structure of the working machine, it is preferable that a film made of a hydrophobic material is formed on the reinforcing tape.

  According to this configuration, even when the side surface of the sound absorbing material is immersed in rainwater or the like, the deterioration of the sound absorbing material can be suppressed by preventing rainwater or the like from entering the side surface of the sound absorbing material. The peeling of the sound absorbing material accompanying the deterioration can be suppressed.

  That is, in this configuration, the sound absorbing material can be protected from moisture for the side portion rising from the mounting surface, so that the sound absorbing material can be prevented from peeling off due to the erosion of the mounting surface accompanying the deterioration of the side surface portion.

  On the other hand, the reinforcing tape may be formed with a film having ultraviolet absorption performance.

  According to this configuration, even when the side surface of the sound absorbing material is exposed to sunlight for a long time, deterioration of the side surface of the sound absorbing material due to the sunlight can be suppressed. Can be suppressed.

  In other words, in this configuration, the sound absorbing material can be protected from ultraviolet rays at the side portion rising from the mounting surface, and therefore the sound absorbing material can be prevented from peeling off due to the erosion of the mounting surface accompanying the deterioration of the side surface portion.

  In the case where the respective films are formed, it is particularly preferable that the reinforcing tape is adhered over the entire circumference of the side surface of the sound absorbing material rising from the mounting surface.

  According to this configuration, since deterioration due to moisture or ultraviolet rays can be suppressed over the entire circumference of the side surface of the sound absorbing material, erosion of the mounting surface can be more reliably prevented and peeling of the sound absorbing material can be prevented.

  Further, the present invention is a sound absorbing structure for a work machine having a sound absorbing material whose preset mounting surface is attached to a surface to be mounted in the engine room of the work machine, wherein at least a side surface of the sound absorbing material rising from the mounting surface is provided. A part of the inclined surface is inclined with respect to a surface perpendicular to the surface to be mounted. The inclined surface faces the cooling fan of the engine and intersects with the wind direction of the cooling fan. And a sound absorbing structure for a working machine, wherein the sound absorbing structure is inclined in a direction away from the attachment target surface toward the downstream side of the air direction of the cooling fan.

  According to the present invention, since the inclined surface is inclined in a direction away from the attachment target surface as it goes downstream of the cooling fan wind direction, the cooling fan can be blown along the inclined surface, The load on the side surface of the sound absorbing material can be reduced and peeling of the sound absorbing material can be suppressed compared to the case where the cooling fan wind is received on the side surface upright on the mounting target surface.

  Furthermore, in the present invention, the reaction force generated in the sound absorbing material when the wind of the cooling fan is passed acts on the direction in which the sound absorbing material is pressed against the mounting target surface side. Peeling can be suppressed.

  Therefore, according to this invention, peeling of the sound-absorbing material from the attachment target surface can be suppressed.

  According to the present invention, peeling of the sound absorbing material from the attachment target surface can be suppressed.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  1A and 1B show an overall configuration of a work machine according to an embodiment of the present invention. FIG. 1A is a side view and FIG. 1B is a plan view.

  The work machine 1 is equipped with a lower traveling body 2 provided with a crawler 2a, an upper revolving body 3 that is pivotably mounted on the lower traveling body 2, and a front part of the upper revolving body 3 that can be raised and lowered. And a work attachment 4.

  The upper swing body 3 is provided with a body 5 whose front part is connected to the cabin 5a. As shown in FIG. 1B, the body 5 has a U-shape in plan view so as to surround the side and the rear of the work attachment 4. The body 5 is provided with a bonnet 5b that covers an upper part of a built-in engine room (not shown) so as to be freely opened and closed. Although not shown, an engine cooling fan is provided in the engine room.

  As shown in FIGS. 2 and 3, the sound absorbing unit 6 according to the present invention is attached to the top plate inner side surface (attachment target surface: hereinafter referred to as the top surface 5c) of the bonnet 5b.

  FIG. 2 is an exploded perspective view showing the sound absorbing unit 6 according to the present invention. 3 is a cross-sectional view taken along line III-III in the assembled state of the sound absorbing unit 6 of FIG.

  Referring to the drawings, the sound absorbing unit 6 includes a rectangular block-shaped sound absorbing material 7 and a pair of reinforcing tapes 8 attached to both side surfaces 7A and 7B of the sound absorbing material 7, and the side surface 7A is It is attached to the top surface 5c so as to face a cooling fan (not shown) and intersect the wind direction Y1 of the cooling fan. In the following description, the direction in which the reinforcing tapes 8 face each other is referred to as the front-rear direction, and the direction orthogonal to the front-rear direction and the up-down direction is described as the left-right direction.

  As shown in detail in FIG. 3, the sound-absorbing material 7 is a structure in which an adhesive layer 7a, a sound-absorbing layer 7b, and a reinforcing layer 7c are formed in order from the top, and the upper surface on which the adhesive layer 7a is formed is the top surface 5c. The mounting surface 7E is attached. Note that the adhesive layer 7a and the reinforcing layer 7c are not formed on the side surfaces 7A and 7B of the sound absorbing material 7, and the side surfaces 7A and 7B are in a state in which the sound absorbing layer 7b is exposed.

  The adhesive layer 7a is made of an acrylic adhesive material. The sound absorbing layer 7b is formed of a urethane foam resin, and absorbs engine sound and attenuates sound leaking from the bonnet 5b. The reinforcing layer 7c is made of a polyester-based nonwoven fabric or the like, and maintains the form of the sound absorbing layer 7b.

  The reinforcing tape 8 has a length L1 that can be attached to the entire side surface 7A or 7B, and a mounting surface 7E that is attached to the side surface 7A or 7B with its lower edge aligned with the lower surface 7F of the sound absorbing material 7. This is a strip-shaped tape set to a width dimension that protrudes only from the excess dimension D1. And this reinforcement tape 8 is stuck over the side surface 7A or 7B of the sound-absorbing material 7 and the top surface 5c of the bonnet 5b in a state of being folded back by the surplus dimension D1.

  Specifically, the reinforcing tape 8 includes a coating 8a and an adhesive layer 8b formed on the surface of the coating 8a, and the adhesive layer 8b is adhered to the side surface 7A or 7B and the top surface 5c. The coating 8a is a hydrophobic film formed of an acrylic resin colored in black. Therefore, the side surfaces 7A and 7B (the sound absorbing layer 7b exposed from the side surfaces 7A and 7B) of the sound absorbing material 7 covered with the coating 8a are protected from moisture such as rainwater by the hydrophobicity of the coating 8a, and are black. The coating film 8a is protected from ultraviolet rays by the ultraviolet absorbing performance. The coating 8a is flexible enough to prevent damage caused by folding. The adhesive layer 8b is formed of an acrylic adhesive material.

  Hereinafter, a procedure for attaching the sound absorbing unit 6 to the top surface 5c of the bonnet 5b will be described with reference to FIGS. 4A and 4B are side cross-sectional views showing a method of attaching the sound absorbing unit 6, in which FIG. 4A is a state where the reinforcing tape 8 is attached to the sound absorbing material 7, and FIG. 4B is a state where the sound absorbing unit 6 is attached to the top surface 5c. Each state is shown.

  First, as shown in FIG. 4A, the reinforcing tape 8 is attached to the side surface 7 </ b> A or 7 </ b> B of the sound absorbing material 7 after aligning the lower edge portion of the reinforcing tape 8 with the lower surface 7 </ b> F of the sound absorbing material 7. Thereby, the upper part of the reinforcement tape 8 will be in the state which protruded from the attachment surface 7E of the sound-absorbing material 7 only by the surplus dimension D1.

  Next, the adhesive layer 7a of the sound absorbing material 7 and the adhesive layer 8b of the reinforcing tape 8 are folded back outwardly by the excess dimension D1 so that the reinforcing tape 8 and the mounting surface 7E are flush with each other. The sound absorbing unit 6 is attached to the top surface 5c of the bonnet 5b.

  In this pasting operation, the side surface 7A of the sound absorbing material 7 is adjusted to face the cooling fan (not shown) and intersect the wind direction Y1 of the cooling fan. It is necessary to attach to the surface 5c.

  As described above, according to the sound absorbing structure in which the sound absorbing unit 6 is attached to the top surface 5c of the bonnet 5b, the reinforcing tape 8 is stuck across the side surface 7A or 7B of the sound absorbing material 7 and the top surface 5c. Therefore, it is possible to suppress the front end portion of the mounting surface 7E from floating from the top surface 5c. Therefore, it is possible to suppress the front end portion of the mounting surface 7E from peeling off from the top surface 5c as a result of this lifting.

  In the sound absorbing structure, since the area of attachment (attachment) of the sound absorbing material 7 to the top surface 5c can be increased by the amount of attachment of the reinforcing tape 8, the sound absorbing material 7 is attached only by the attachment surface 7E. Rather than the top surface 5c.

  Therefore, in the sound absorbing structure, peeling of the sound absorbing material 7 from the top surface 5c can be suppressed.

  2 to 4 show an example in which the sound absorbing unit 6 is attached to a portion of the bonnet 5b where the top surface 5c is formed flat. As shown in FIG. It is also possible to attach the sound absorbing unit 6 to the top surface 5c of the bonnet 5b having a concavo-convex sectional shape in which the portion 10 is continuous.

  In this way, when the sound absorbing material 7 is adhered along the uneven portions 9 and 10 of the top surface 5c, a force in the direction of returning to the original shape (rectangular block shape) acts on the sound absorbing material 7 in particular. Therefore, the edge of the sound absorbing material 7 tries to float up from the top surface 5c, but the sound absorbing material 7 adheres to the side surfaces 7A and 7B of the sound absorbing material 7 and the top surface 5c so that the sound absorbing material 7 sticks to each other. The lifting of the edge of the material 7 in the front-rear direction can be suppressed.

  Then, from the viewpoint of suppressing the lifting of the edge of the sound absorbing material 7, as shown in FIG. 6A, the reinforcing tape 8 is attached to the left and right side surfaces 7 </ b> C and 7 </ b> D of the sound absorbing material 7, respectively. It is particularly preferable that the reinforcing tape 8 is stuck around the entire side surfaces 7A to 7D of the side surfaces of the material 7.

  In the sound absorbing structure, since the reinforcing tape 8 is attached to the side surface 7A of the sound absorbing material 7 disposed so as to intersect the wind direction Y1 of the cooling fan, the reinforcing tape 8 is applied across the side surface 7A and the top surface 5c. The attached reinforcing tape 8 can prevent the movement of the front end portion of the mounting surface 7E that tends to float from the side surface 7A that has received the wind of the cooling fan. Therefore, according to this structure, the movement of the edge part of the attachment surface 7E used as the trigger of peeling of the sound absorption material 7 can be suppressed.

  Furthermore, in the sound absorbing structure, the boundary portion between the mounting surface 7E and the top surface 5c can be covered with the reinforcing tape 8 so that the cooling fan can be prevented from entering the boundary portion. It is possible to prevent the front end portion of the mounting surface 7E from being lifted by the boundary portion being pushed and spread by the wind pressure.

  In the sound absorbing structure, since the coating 8a of the reinforcing tape 8 is made of a hydrophobic material, even if the side surface 7A or 7B of the sound absorbing material 7 is immersed in rain water or the like, rain water or the like By preventing the sound absorbing material 7 from entering the side surface 7A or 7B, the deterioration of the sound absorbing material 7 can be suppressed. As a result, the sound absorbing material 7 can be prevented from peeling off due to the deterioration.

  That is, in the reinforcing tape 8, the sound absorbing material 7 can be protected from moisture on the side surfaces 7A and 7B rising from the mounting surface 7E, so that the sound absorbing material 7 is eroded by the erosion of the mounting surface 7E accompanying the deterioration of the side surface 7A or 7B. It can suppress peeling.

  Further, in the embodiment, since the reinforcing tape 8 is formed with a film having an ultraviolet absorbing performance, even if the side surface 7A or 7B of the sound absorbing material 7 is exposed to sunlight for a long time, the sound absorbing material by the sunlight is concerned. 7 can suppress the deterioration of the side surface 7A or 7B, so that the sound absorbing material 7 can be prevented from peeling off due to the deterioration.

  That is, in the reinforcing tape 8, the sound absorbing material 7 can be protected from ultraviolet rays on the side surfaces 7A and 7B rising from the mounting surface 7E, and therefore the sound absorbing material 7 is eroded by the erosion of the mounting surface 7E due to the deterioration of the side surfaces 7A and 7B. It can suppress peeling.

  In particular, as shown in FIG. 6A, when the reinforcing tape 8 is applied over the entire circumference of the side surfaces 7A to 7D, the side surfaces 7A to 7D of the sound absorbing material 7 are prevented from being deteriorated by moisture or ultraviolet rays. Therefore, the erosion of the mounting surface 7E can be prevented more reliably, and the sound absorbing material 7 can be prevented from being peeled off.

  In the above embodiment, the strip-shaped reinforcing tape 8 is described. However, the shape of the reinforcing tape 8 is not particularly limited. For example, as shown in FIG. The notch 11 can also be formed in the part of the excess dimension D1 stuck on the surface 5c.

  That is, when there is a bolt B1 or opening B2 or the like that forms a step on the top surface 5c, the notch 11 is formed on the reinforcing tape 8 so as to avoid the bolt B1 or opening B2. Thus, the reinforcing tape 8 can be adhered so as to cover the bolt B1 and the opening B2 and the edge of the reinforcing tape 8 can be prevented from being lifted from the top surface 5c. The peeling of the sound absorbing material 7 can be suppressed.

  Hereinafter, another embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  This embodiment is different from the above embodiment in that the reinforcing tape 8 is omitted.

  Specifically, in the sound absorbing material 12 of the present embodiment, a side surface that is disposed so as to face the cooling fan (not shown) and intersect the wind direction Y1 of the cooling fan is an inclined surface 12A. ing.

  The inclined surface 12A is inclined in a direction away from the top surface 5c toward the downstream side (right side in FIG. 7) of the wind direction Y1 of the cooling fan.

  Therefore, according to the sound absorbing structure in which the mounting surface 12E of the sound absorbing material 12 is attached to the top surface 5c, the wind from the cooling fan can be passed along the inclined surface 12A, and therefore the side surface upright on the top surface 5c. Compared with the case where the wind of the cooling fan is received, the load on the side surface of the sound absorbing material 12 can be reduced and the peeling of the sound absorbing material 12 can be suppressed.

  Furthermore, according to the sound absorbing structure of the present embodiment, the reaction force generated in the sound absorbing material 12 when the wind of the cooling fan is passed acts as the force F1 in the direction of pressing the sound absorbing material 12 toward the top surface 5c. Therefore, peeling of the sound absorbing material 12 can be suppressed also by this force F1.

  And in this embodiment, it is made difficult to receive the influence of the wind from a cooling fan by forming 12 A of inclined surfaces in the sound-absorbing material 12, but it suppresses peeling of the said sound-absorbing material 12, FIG. As shown, even the sound absorbing material 14 without the inclined surface 12A can reduce the influence of the cooling fan.

  That is, in the embodiment shown in FIG. 8, the side surface 14A of the sound absorbing material 14 disposed so as to face the cooling fan (not shown) and intersect the wind direction Y1 of the cooling fan, and the cooling fan A windbreak wall 15 suspended from the top surface 5c is provided.

  According to this embodiment, since the wind from the cooling fan can be prevented from being blown directly onto the side surface 14A of the sound absorbing material 14 by the windbreak wall 15, it floats from the side surface 14A receiving the wind of the cooling fan. The movement of the edge of the mounting surface 14E that is about to rise can be prevented. Therefore, also according to this embodiment, the movement of the edge portion of the mounting surface 14E that causes the sound absorbing material 14 to peel off can be suppressed.

  In the above-described embodiment, the sound absorbing structure in which the sound absorbing materials 7, 12 and 14 are attached to the hood 5b of the work machine 1 is described. However, the sound absorbing materials 7, 12 and 14 are positions of sound sources to be sound absorbing. It can be set appropriately depending on the situation. For example, the inner surface of the side panel 5d (see FIG. 1) disposed on both sides of the engine room can be set as the attachment target surface.

  Furthermore, in each said embodiment, although the structure which attaches the sound-absorbing materials 7, 12, and 14 in the attitude | position hanging from the top | upper surface 5c of the bonnet 5b was demonstrated, the attitude | position of the sound-absorbing materials 7, 12 and 14 at the time of attachment is especially For example, the sound-absorbing materials 7, 12 and 14 can be attached to a vertical surface like the inner surface of the side panel 5d. However, in the case of being attached in a posture suspended from the top surface 5c as in the above embodiment, the weight of the sound absorbing material 7, 12 and 14 acts as a force in the direction of peeling from the top surface 5c. Therefore, it is particularly preferable to adopt the above-described configuration for the sound absorbing materials 7, 12, and 14 in order to reduce this force.

BRIEF DESCRIPTION OF THE DRAWINGS The whole structure of the working machine which concerns on embodiment of this invention is shown, (a) is a side view, (b) has shown the top view. It is a perspective view which decomposes | disassembles and shows the sound absorption unit 6 which concerns on this invention. It is the III-III sectional view taken on the line in the assembly | attachment state of the sound absorption unit of FIG. It is side surface sectional drawing which shows the attachment method of a sound absorption unit, (a) has shown the state which affixed the reinforcement tape to the sound absorption material, (b) has each shown the state which affixes a sound absorption unit to a top plate. It is side surface sectional drawing which shows the state which attached the sound absorption unit to the bonnet which has an uneven | corrugated | grooved part. It is a top view which shows the sound-absorbing unit which concerns on another embodiment of this invention, (a) is what the reinforcement tape was affixed over the perimeter of the side surface, (b) is what the notch part was formed, respectively. Show. It is side surface sectional drawing which abbreviate | omits and shows a part of sound-absorbing material which concerns on another embodiment of this invention. It is side surface sectional drawing which abbreviate | omits and shows a part of sound-absorbing material which concerns on another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work machine 5b Bonnet 5c Top surface 5d Side panel 6 Sound absorption unit 7 Sound absorption material 7A-7D Side surface 7E Mounting surface 8 Reinforcement tape 8a Coating 12 Sound absorption material 12A Inclined surface 12E Mounting surface 14 Sound absorption material 14A Side surface 14E Winding direction Y1

Claims (6)

A sound absorbing structure of a work machine having a sound absorbing material attached to a mounting target surface of the work machine with a preset mounting surface,
A reinforcing tape attached to at least a part of the side surface of the sound absorbing material rising from the edge of the mounting surface;
The reinforcing tape is bonded across the side surface and the surface to be bonded, and the sound absorbing structure of the working machine is characterized in that it is bonded.   The mounting target surface is set in the engine compartment, and the reinforcing tape is disposed so as to face at least the cooling fan of the engine and cross the wind direction of the cooling fan. The sound absorbing structure for a work machine according to claim 1, wherein the sound absorbing structure is attached to the work machine.   The sound absorbing structure for a work machine according to claim 1, wherein a film made of a hydrophobic material is formed on the reinforcing tape.   The sound absorbing structure for a working machine according to any one of claims 1 to 3, wherein the reinforcing tape is formed with a film having an ultraviolet absorbing performance.   5. The sound absorbing structure for a work machine according to claim 3, wherein the reinforcing tape is attached over the entire circumference of the side surface of the sound absorbing material rising from the mounting surface. A sound absorbing structure of a work machine having a sound absorbing material attached to a mounting target surface in the engine room of the work machine, wherein the mounting surface set in advance is,
At least a part of the side surface of the sound absorbing material rising from the mounting surface is an inclined surface that is inclined with respect to a surface perpendicular to the mounting target surface,
The inclined surface is disposed so as to face the cooling fan of the engine and intersect the wind direction of the cooling fan, and from the mounting target surface toward the downstream side of the wind direction of the cooling fan. A sound absorbing structure for a working machine, wherein the sound absorbing structure is inclined in a separating direction.

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