Work equipment

Abstract

To achieve a work machine where outside noise hardly invades in a cabin.SOLUTION: A work machine includes a machine body, a step plate (21) installed on the machine body, and a cabin (5) installed on the step plate (21). The cabin (5) includes a mounting part (5a) extended toward the inside of the cabin (5) at a bottom part of a peripheral wall, and it is fixed to the step plate (21) by being screw-fastened to the mounting part (5a), in a state where the mounting part (5a) comes into contact with an outer edge part (21a) of the step plate (21). Between the mounting part (5a) and the outer edge part (21a), a seal material (25) is arranged in an elastically deformed state.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a work machine such as a backhoe. [Background technology]

[0002] Conventionally, there is known a work machine that outputs a warning sound in conjunction with the travel of the work machine (for example, Patent Document 1). The operator of the work machine is exposed to various noises generated during work, in addition to the warning sound. In the case of a work machine provided with a cabin that covers the driver's seat, the cabin blocks the sound, thereby reducing the noise that reaches the operator.

[0003] The cabin is attached with bolts or the like to the top surface of the step plate, which forms the floor of the driver's seat. A frame-shaped mounting section is provided at the bottom of the cabin's peripheral wall, extending toward the inside of the cabin. The cabin is fixed to the step plate by screwing this mounting section to the outer edge of the step plate, with the mounting section in contact with the outer edge. As both the mounting section and the step plate are made of sheet metal, the screws bring the metal sheets into close contact with each other, sealing the contact area. The contact area between the metal sheets is set to a standard dimension of zero gap. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-17450 Summary of the Invention [Problem to be solved by the invention]

[0005] However, even if the standard dimensions are set to zero, a gap actually occurs at the contact point. This gap is caused by the step plate being deflected by the weight of the components installed on the step plate, such as the driver's seat, and the weight of the operator sitting in the seat. When a gap occurs at the contact point, external sounds enter the cabin through the gap, causing increased noise around the ears.

[0006] One aspect of the present invention has been made in consideration of the above-mentioned problems, and has an object to provide a work machine in which external sounds are less likely to intrude into the interior of the cabin. [Means for solving the problem]

[0007] In order to solve the above problems, a work machine according to one embodiment of the present invention comprises a body, a step plate installed on the body, and a cabin installed on the step plate, wherein the cabin has an attachment portion at the bottom of the peripheral wall extending toward the inside of the cabin, and the attachment portion is fixed to the step plate by being screwed to the attachment portion with the attachment portion in contact with the outer edge of the step plate, and a sealing material is arranged between the attachment portion and the outer edge in an elastically deformed state.

[0008] According to the above configuration, even if the step plate bends and a gap occurs, the sealing material can restore its original shape and close the gap, thereby preventing external noise from entering the cabin through the gap caused by the bending of the step plate.

[0009] In a work machine according to one aspect of the present invention, the sealing material may be disposed between the mounting portion and the outer edge portion, between the screw-fastened locations.

[0010] According to the above configuration, the sealing material is disposed only in the portion where a gap occurs, thereby making it possible to prevent the sealing material from being wasted.

[0011] In a work machine according to one embodiment of the present invention, one of the mounting portion and the outer edge portion may have a step portion between the screw-fastened points that forms a step in a direction away from the other side, and the sealing material may be arranged in the step portion.

[0012] According to the above configuration, the sealing material can be made thick to ensure sufficient crushing allowance, so even if the amount of deflection changes and the size of the gap changes, the sealing material can change to follow the change and close the gap.

[0013] In the work machine according to one aspect of the present invention, the step portion may include a notch provided on the outer edge portion and extending along the outer edge of the step plate, and a support plate fixed to the underside of the step plate and covering the notch from the underside. With the above configuration, the step portion can be easily realized.

[0014] In one embodiment of the work machine of the present invention, the step plate may be approximately rectangular in shape, the mounting portion may be screwed to the four corners of the step plate, and the sealing material may be arranged on the sides excluding the four corners.

[0015] According to the above configuration, in a configuration in which the mounting portions are fastened with screws at the four corners of the step plate, gaps in four directions that occur due to bending of the step plate can be effectively closed.

[0016] In the work machine according to one aspect of the present invention, a foam member that closes an opening facing a space that communicates with the interior of the cabin may be disposed in the opening.

[0017] According to the above configuration, it is possible to suppress external noise from entering the interior of the cabin through the opening and the space.

[0018] In the work machine according to one aspect of the present invention, the space may be a space for passing a harness of an electrical component.

[0019] According to the above configuration, it is possible to prevent external noise from entering the interior of the cabin through the opening for pulling out the harness to the outside. [Effects of the Invention]

[0020] According to one aspect of the present invention, it is possible to realize a work machine in which external sounds are less likely to intrude into the cabin. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic perspective view showing the overall configuration of a work machine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a schematic perspective view showing the interior of a cabin of the work machine. [Figure 3] FIG. 2 is a schematic perspective view showing the cabin and the step plate separated from each other. [Figure 4] FIG. 2 is a schematic perspective view of the cabin with the bottom side facing upward. [Figure 5] 4A and 4B are a partially exploded perspective view and a partially enlarged view showing a mounting structure of a sealing material in the step plate; [Figure 6] FIG. 4 is a cross-sectional perspective view showing a main part of the portion where the cabin is attached to the step plate. [Figure 7] FIG. 2 is an enlarged view of area A in FIG. [Figure 8] FIG. 2 is a cross-sectional perspective view of a main part showing the position of an opening that connects to the outside of the cabin. [Figure 9] FIG. 2 is a cross-sectional perspective view of the working machine taken along a horizontal plane. [Figure 10] FIG. 10 is an enlarged view of an area B shown in FIG. [Figure 11] FIG. 10 is a view showing a state in which a foam sheet is placed in an opening before being foamed. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.

[0023] (Outline of the work equipment) Fig. 1 is a schematic perspective view showing the overall configuration of a work machine 1 according to this embodiment. Fig. 2 is a schematic perspective view showing the interior of a cabin 5 of the work machine 1. In this embodiment, a backhoe is exemplified as the work machine 1.

[0024] As shown in Fig. 1, the work machine 1 includes a traveling device 2, a machine body 3, and a working device 4. The machine body 3 is supported on the frame of the traveling device 2 via a bearing body so as to be rotatable about a vertical axis (an axis extending in the up-down direction). The machine body 3 is equipped with a cabin 5, a prime mover 6, a bonnet 7, a counterweight 8, the working device 4, and the like.

[0025] As shown in FIG. 2, inside the cabin 5 (hereinafter referred to as the interior) is provided a driver's seat 20 (installed component) where an operator (driver) sits. The driver's seat 20 is installed on a step board 21, which forms the floor of the interior. Around the driver's seat 20, in addition to a plurality of operation levers 22 for operating the traveling device 2, the working device 4, and the machine body 3, a plurality of electrical components such as a display device and an air conditioner, which are not shown, are arranged. In the following description, the front side of the operator seated in the driver's seat 20 will be referred to as the front, the rear side of the operator as the rear, the left side of the operator as the left side, and the right side of the operator as the right side. The cabin 5 is installed to the left of the machine body 3.

[0026] As shown in Fig. 1, the working implement 4 is a device that operates using hydraulic oil pressure as a working fluid pressure, and is installed at the front of the machine body 3. The working implement 4 includes a first boom 15, a second boom 16, an arm 17, a bucket 18, and the like, which are rotated by hydraulic cylinders 11, 12R, 12L, 13, and 14.

[0027] (Cabin installation) Fig. 3 is a schematic perspective view showing the cabin 5 and the step board 21 separated from each other. Fig. 4 is a schematic perspective view of the cabin 5 with the bottom side facing upward.

[0028] As shown in Fig. 3, the cabin 5 is fixed to the step plate 21 on which the driver's seat 20 is installed. As shown in Fig. 4, a mounting portion 5a extending toward the inside of the cabin 5 is provided at the bottom of the peripheral wall of the cabin 5. The mounting portion 5a is formed in a frame shape. The cabin 5 is fixed to the step plate 21 by fastening the mounting portion 5a to the outer edge portion 21a of the step plate 21 with bolts or the like while the mounting portion 5a is in contact with the outer edge portion 21a.

[0029] Because both the mounting portion 5a and the step plate 21 are made of metal, in a conventional configuration without the sealant 25, the metal plates come into close contact with each other when fastened with screws, sealing the contact area. However, in such a configuration, as described above, the weight of installed components such as the driver's seat 20 and the operator seated in the driver's seat 20 causes the step plate 21 to bend. This creates a gap at the contact area between the outer edge 21a of the step 21 and the mounting portion 5a.

[0030] (Countermeasure for gaps caused by bending of step boards) 3, in the work machine 1, a sealing material 25 is arranged in an elastically deformed state between the mounting portion 5a and the outer edge portion 21a. The sealing material 25 is elastically deformed when the cabin 5 is mounted on the step plate 21 (when fastened with screws). The sealing material 25 is an elongated member that extends along the outer edge of the step plate 21, and is an elastic body such as rubber; for example, a rubber sponge can be used.

[0031] In this way, by placing the sealing material 25 between the mounting portion 5a and the outer edge portion 21a in a state in which the cabin 5 is elastically deformed by the weight of the cabin 5 by mounting the cabin 5 on the step plate 21, even if the step plate 21 bends and a gap occurs, the sealing material 25 can restore its original shape and close the gap. This makes it possible to prevent external noise from entering the cabin 5 through gaps caused by the bending of the step plate 21.

[0032] More specifically, gaps due to bending of the step plate 21 occur between the screw-fastened portions. Therefore, in this embodiment, the sealing material 25 is disposed between the screw-fastened portions between the mounting portion 5a and the outer edge portion 21a. Note that while FIG. 3 illustrates a configuration in which the sealing material 25 is disposed on the step plate 21, the sealing material 25 may also be disposed on the mounting portion 5a of the cabin 5. In this way, by disposing the sealing material 25 only in the portions where gaps occur, waste of the sealing material 25 can be avoided.

[0033] In this embodiment, the step plate 21 has a substantially rectangular shape, and the mounting portions 5a are fastened with screws at the four corners of the step plate 21. Therefore, the sealing material 25 is disposed on the four sides of the step plate 21, excluding the four corners (four corner portions). In this configuration in which the mounting portions 5a are fastened with screws at the four corners of the step plate 21, by disposing the sealing material 25 on the sides excluding the four corners, gaps in all four directions that occur due to bending of the step plate 21 can be effectively sealed.

[0034] 5 is a partially exploded perspective view and a partially enlarged view showing the mounting structure of the sealing material 25 on the step plate 21. FIG. 6 is a sectional perspective view showing the main part of the portion where the cabin 5 is mounted on the step plate 21.

[0035] As shown in Figures 5 and 6, in this embodiment, the outer edge portion 21a has step portions 24 that form a step in a direction away from the mounting portion 5a between screw-fastened locations, and the sealant 25 is arranged in the step portions 24. Note that Figures 5 and 6 illustrate a configuration in which the step portions 24 are provided on the step plate 21 and the sealant 25 is arranged on the step plate 21, but the step portions 24 may be provided on the mounting portion 5a of the cabin 5, and the sealant 25 may be arranged on the mounting portion 5a. In other words, it is sufficient that one of the mounting portion 5a and the outer edge portion 21a has step portions 24 that form a step in a direction away from the other side between screw-fastened locations, and the sealant 25 is arranged in the step portions 24.

[0036] In this way, by providing the step portion 24 and lowering the surface on which the sealing material 25 is placed below the upper surface of the step plate 21 (or raising the surface on which the sealing material 25 is placed above the lower surface of the mounting portion 5a), the sealing material 25 can be made thicker, and a sufficient amount of compression margin for the sealing material 25 can be ensured. As a result, even if the amount of deflection of the step plate 21 changes due to differences in the weight of the operator or the like, and the size of the gap changes, the sealing material 25 can change its volume to follow this change and close the gap. Furthermore, because the sealing material 25 can be made thicker, its elasticity is less likely to decrease than when the sealing material 25 is thin, and sealing performance can be ensured for a long time.

[0037] As shown in Fig. 5, the step portion 24 in the outer edge portion 21a is formed by forming a notch portion 21b in the outer edge portion 21a that extends along the outer edge of the step plate 21, and fixing a support plate 23 to the underside of the step plate 21 so as to cover the notch portion 21b from below. In other words, the step portion 24 has the notch portion 21b that extends along the outer edge of the step plate 21, and the support plate 23 that is fixed to the underside of the step plate 21 and covers the notch portion 21b from below. The support plate 23 is a long, narrow sheet metal member that matches the shape of the notch portion 21b. The support plate 23 is fixed to the underside of the step plate 21 by, for example, welding.

[0038] This configuration makes it easy to realize the step portion 24 for ensuring the thickness of the sealing material 25. Note that the same configuration can be applied when the step portion 24 is provided on the mounting portion 5a.

[0039] Although not shown, the sealing material 25 is disposed on the upper surface of the support plate 23, and when the cabin 5 is not mounted on the step plate 21, the upper surface of the sealing material 25 passes through the cutout portion 21b and protrudes above the upper surface of the step plate 21. This protruding portion becomes the crushing margin of the sealing material 25 when the cabin 5 is mounted.

[0040] As shown in Figure 6, when the mounting portion 5a of the cabin 5 is mounted on the outer edge portion 21a of the step plate 21, the sealing material 25 is pressed against the mounting portion 5a and elastically deformed. In the elastically deformed state, the upper surface of the sealing material 25 is flush with the upper surface of the step plate 21, and similar to a screw-fastened portion, there is no gap at the contact portion between the outer edge portion 21a and the mounting portion 5a. The sealing material 25 is constantly biased in the direction of pushing up the mounting portion 5a with its restoring force.

[0041] Furthermore, the sealing material 25 may be an independent part provided separately from the step plate 21 or the mounting portion 5a, or may be bonded or fitted to the step plate 21 or the mounting portion 5a in advance to make it difficult to come off. This eliminates the need to align the sealing material 25 with the step plate 21 or the mounting portion 5a in the process of mounting and installing the cabin 5 on the step plate 21, improving workability.

[0042] (Other noise control measures) In the work machine 1, there are paths through which external noise can enter the interior of the cabin 5, in addition to the gaps caused by the bending of the step plate 21. It is preferable to block such paths as well.

[0043] Fig. 7 is an enlarged view of area A in Fig. 1. Fig. 8 is a cross-sectional perspective view of a main part showing the position of an opening 30 that connects to the outside of the cabin 5. Fig. 9 is a cross-sectional perspective view of the work machine 1 cut along a horizontal plane. Fig. 10 is an enlarged view of area B shown in Fig. 9.

[0044] The cabin 5 is formed by combining and welding metal sheets that have been processed into a predetermined shape, such as a bent shape. As a result, openings (gaps) that cannot be completely closed may occur between the metal sheets, or openings may be provided for reasons of the manufacturing process. As an example, as shown in Figures 7 and 8, a relatively large opening 30 that connects to the outside of the cabin 5 is located below the frame 5c on the right side at the rear of the cabin 5.

[0045] This opening 30 is provided on the right side of the rear part of the cabin 5 where the frame 5c is located, and is an opening that is necessarily created when creating a space 31 through which harnesses can be passed for routing near the ceiling inside the cabin 5, and is a location that connects the inside and outside of the cabin 5. The space 31 is a space that communicates with the inside of the cabin, and in the space 31, harnesses for the forward lighting and rear lighting that are attached to the top of the cabin 5 are installed.

[0046] Such opening 30 faces a space 31 that is connected to the interior of the cabin 5, and therefore serves as a path for external noise to enter the cabin 5 through the opening 30. Note that Fig. 8 shows the state of the opening 30 before any countermeasures are taken.

[0047] Fig. 9 is a cross-sectional perspective view of the work machine 1 cut on a horizontal plane. Fig. 10 is an enlarged view of area B shown in Fig. 9. Figs. 9 and 10 show a state in which measures have been taken for the opening 30. As shown in Figs. 9 and 10, in the work machine 1, a foam member 32 that closes the opening 30 is placed in the opening 30 to suppress the intrusion of noise from the opening 30. The placement of the foam member 32 closes the opening 30, thereby making it possible to suppress the intrusion of external noise from the opening 30 through the space 31 into the interior of the cabin 5.

[0048] In a configuration in which the opening 30 is closed using such a foam member 32, the foam member 32 can be foamed by utilizing the heat generated during the process of drying the paint applied to the cabin 5. That is, as shown in Fig. 11, a foam sheet 32S cut to fit the shape of the opening 30 is placed in the opening 30 before the process of drying the paint applied to the cabin 5. Then, the foam sheet 32S is foamed by utilizing the heat generated during the process of drying the paint applied to the cabin 5, thereby closing the opening 30. Fig. 11 is a diagram showing the foam sheet placed in the opening 30 before being foamed.

[0049] Note that, although the opening 30 facing the space 31 through which a harness for routing near the ceiling is passed has been exemplified as an opening that serves as a route for noise penetration, the present invention is not limited to this. In other words, by placing a foam sheet 32S cut to the desired shape in the opening (gap) that serves as a route for noise penetration into the cabin 5, the gap can be sealed using the heat generated during the drying process of the paint applied to the cabin 5.

[0050] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0051] 1 Work equipment 3 aircraft 4 Work equipment 5 Cabins 5a Mounting part 20 Driver's seat 21 Step board 21a outer edge 23 Support plate 24 Step 25 Sealing material 30 aperture 31 Space 32 Foam materials

Claims

1. The aircraft and A step board installed on the aircraft body; a cabin installed on the step board, The cabin has an attachment portion at the bottom of the peripheral wall that extends toward the inside of the cabin, and is fixed to the step plate by fastening the attachment portion to the step plate at a portion where the attachment portion contacts the outer edge of the step plate, a sealing material is disposed between the mounting portion and the outer edge portion in an elastically deformed state between the screw-fastened portions, A work machine in which a notch extending along the outer edge of the step plate is formed between the screw-fastened points on the outer edge, and a support plate is fixed to the underside of the step plate to cover the notch from the underside, and the seal is placed in the step formed by the notch and the support plate.

2. The step plate has a substantially rectangular shape, The mounting portion is fastened to the step plate at four corners by screws, The work machine according to claim 1 , wherein the sealing material is disposed on the sides excluding the four corners.

3. The work machine according to claim 1, wherein a foam member is disposed at an opening facing the space communicating with the interior of the cabin to close the opening.

4. 4. The work machine according to claim 3, wherein the space is a space for passing a harness for an electrical component.

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