JP2021139157A - Work machine - Google Patents

Abstract

To provide a work machine allowing a camera for acquiring front images to be adequately attached on a cab.SOLUTION: A work machine 1 is provided with a cab 10. The cab 10 comprises: a front face 10a in which an open/closable front window 11 is installed; an upper face 10c in which a window plate 12 is received upon opening of the front face 10a; and a bay window 30 covering a communication passage 24 opening in an upper direction of a cross member 23 extending along an upper edge of the front window 11. The bay window 30 comprises a bay window cover 31 attached on the cross member 23 and a bay window plate 32 including a plane part positioned in front of the cross member 23. Cameras 40, 41 for acquiring front images are installed in the bay window 30 in a state with a gap from a space where the window plate 12 passes upon opening/closing.SELECTED DRAWING: Figure 6

Description

The technology to be disclosed relates to a work machine such as a hydraulic excavator in which a camera for front photography is attached to a cab.

In recent years, in order to manage the progress of construction and automatically control construction, a pair of left and right cameras (stereo cameras) are installed on the upper edge of the front of the cab to photograph the front of the work. A model has been proposed (Patent Documents 1 and 2).

In the hydraulic excavator of Patent Document 1, these stereo cameras are installed in the room of the cab.

The front window of the hydraulic excavator of Patent Document 2 can be opened and closed. That is, both sides of the front window are supported by a pair of guide rails via guide rollers, and the front window is configured to slide along the guide rails. As a result, the front window moves between the front surface of the cab and the storage portion provided behind the ceiling of the cab.

In the case of the hydraulic excavator of Patent Document 2, if a stereo camera is installed in the cab as in the hydraulic excavator of Patent Document 1, the front window cannot be opened and closed. Therefore, in the hydraulic excavator of Patent Document 2, a stereo camera is installed outside the cab.

International Publication No. 2017/056267 International Publication No. 2018/179322

When the camera is installed outdoors like the hydraulic excavator of Patent Document 2, it is necessary to cover the surroundings with a case in order to protect the camera from rainwater and dust, and the structure protrudes from the cab. There is a risk of getting caught or hit.

Further, if the case is not sufficiently waterproof or dustproof and rainwater or dust enters the case, there is a risk of causing poor imaging due to fogging or dirt, or damage to electrical components. If the airtightness of the case is improved, such a defect can be suppressed, but the case becomes large and complicated, and the manufacturing cost increases.

The main purpose of the technology disclosed therein is to provide a work machine capable of appropriately attaching a camera for forward photography to the cab.

The technique disclosed relates to a work machine in which an upper swing body with a cab is mounted on a lower traveling body.

The cab is covered with a transparent window plate, and the front surface is provided with a front window that can be opened and closed by moving the window plate inward, and the cab extends rearward in connection with the upper edge of the front surface. An upper surface in which the window plate is housed when the front surface is opened, a cross member extending laterally along the upper edge of the front window, and the front surface and the upper surface along the upper side of the cross member. It has a communication port that opens at the boundary portion and a bay window portion that covers the communication port in a state of protruding from the cab.

The bay window portion is transparent including a bay window cover in which a lower edge portion is integrally attached to the cross member and a flat portion which is attached to the bay window cover and is located on the front side of the cross member and faces forward. It has a bay window board. Then, a camera for front photographing is installed inside the bay window portion in a state where the space through which the window plate passes at the time of opening and closing is separated from the gap.

That is, some conventional work machines can open and close the front window of the cab. This work machine is such a model, and when opening the front window, the window plate moves from the front of the cab through the inside of the upper surface. Therefore, as it is, a camera for front shooting cannot be installed inside the cab.

On the other hand, in this work machine, a bay window portion that communicates with the inside of the cab through a communication port is provided at a curved boundary portion between the front surface and the upper surface. The bay window expands the interior of the cab by the amount inside.

Since the bay window cover of the bay window portion is integrated with the cross member extending laterally along the upper edge of the front window, the strength and rigidity of the cab can be improved together with the cross member which is a reinforcing member. Then, since the bay window portion is provided at the curved portion and the bay window plate includes the flat portion which is located on the front side of the cross member and faces forward, the bay window portion is in a state of protruding forward from the curved portion. The size protruding from the cab can be minimized while ensuring a relatively large internal space. Therefore, the risk of being caught or hit on the bay window during work can be minimized.

Then, using the large internal space, a camera for front photography is installed inside the bay window part with a gap from the space through which the window plate passes when opening and closing, so the window plate that is opened and closed Contact can be avoided. Therefore, even in a cab where the front window is opened and closed, a camera for front shooting can be installed without any trouble.

Since the camera is installed inside the cab, the effects of rainwater and dust can be effectively prevented without covering the camera with a case. Access to the camera is also easy, which is advantageous in terms of work such as assembly and replacement.

The working machine may also have a bay window defroster further installed inside the bay window portion, and the bay window defroster blows air toward the bay window plate and the camera.

If the outside temperature is low, the bay window board and camera lens may become cloudy or the bay window board may be covered with frost, making shooting difficult. On the other hand, in this work machine, since the bay window plate and the bay window defroster that blows air toward the camera are installed inside the bay window portion, the fogging and frost can be removed.

The work machine is also provided with a front window defroster that blows air toward the front window in the cab, and a branch pipe branched from the air pipe of the front window defroster is provided at the side edge of the front window. It may be connected to the bay window defroster through the interior of a vertical pillar extending along it.

Normally, a front window defroster that blows air toward the front window is installed in the cab room. In this work machine, the branch pipe branched from the blower pipe is connected to the bay window defroster through the inside of the vertical pillar extending along the side edge of the front window, and a part of the blower is used to blow air to the bay window plate or the like. , The existing device can be used to realize a bay window defroster inexpensively and easily, and contact with a window plate that is opened and closed can be avoided.

The working machine may also be provided with a partition chamber partitioned other than the front surface inside the bay window portion, and a headlight may be further installed in the partition chamber.

By doing so, the headlight can be installed while avoiding contact with the window plate that is opened and closed. Since the headlights are installed in a compartment that is partitioned except for the front, the light from the headlights does not enter the camera lens or the cab room, which may cause camera shooting defects or obstruction of the operator's field of vision. Can be prevented.

The working machine may also have each of the camera and the headlights attached to the cross member via a support bracket.

That way, even if the cab shakes, the camera and headlights can be supported stably and firmly.

The working machine may also be provided with a viewing window portion inside the bay window portion, which enables visual recognition diagonally forward above the cab through the communication port and the bay window plate.

Then, even if the bay window portion is provided, the tip of the bay window portion can be seen through the viewing window portion, so that the workability is excellent.

According to the disclosed technology, a camera for forward photography can be appropriately attached to the cab, so that a high-performance work machine can be realized.

It is the schematic which shows the work machine to which the disclosed technology was applied. It is a schematic perspective view which shows a cab. It is a schematic perspective view which shows the cab with the front window open and the bay window part removed. It is a schematic perspective view which shows the structure of the opening and closing mechanism of a front window. It is the schematic which looked at the right side part of a bay window part from the front. FIG. 5 is a schematic cross-sectional view of the cab at the portion indicated by the arrow line AA in FIG. FIG. 5 is a schematic cross-sectional view of a bay window portion at a portion indicated by an arrow line BB in FIG. FIG. 5 is a schematic cross-sectional view of a bay window portion at a portion indicated by an arrow line CC in FIG. 5 is a schematic cross-sectional view of the cab at the portion indicated by the arrow line DD in FIG.

Hereinafter, embodiments of the disclosed technology will be described in detail with reference to the drawings. However, the following description is essentially merely an example and does not limit the present invention, its application or its use. The front-back, left-right, and up-down directions used in the description shall follow the arrows shown in each figure.

<Working machine>
FIG. 1 shows a hydraulic excavator 1 as an example of a work machine to which the disclosed technology is applied. The hydraulic excavator 1 includes a lower traveling body 2 and an upper swivel body 3 mounted on the lower traveling body 2 in a swivelable state. The lower traveling body 2 has a pair of crawlers 2a and 2a on the left and right sides thereof. The hydraulic excavator 1 travels by these crawlers 2a and 2a.

The upper swivel body 3 is provided with an upper frame 3a as a base, which is rotatably supported by the lower traveling body 2, and an attachment 4, a cab 10, a machine room 6, and the like are installed on the upper frame 3a. There is. The attachment 4 is composed of a boom 4a, an arm 4b, a bucket 4c, and the like driven by a hydraulic cylinder 4d, and excavation and the like are performed using these. Although not shown, an engine, a hydraulic pump, and the like for driving the attachment 4 and the like are installed inside the machine room 6.

The cab 10 is a rectangular box-shaped driver's cab, and partitions the driver's cab from the outside. The cab 10 is located to the left of the attachment 4. In the cab 10, a bay window portion 30 is provided on the front side of the upper portion thereof.

<Cab 10>
FIG. 2 shows the cab 10. The cab 10 is a metal panel, frame, or the like, and is formed in a box shape having a front surface 10a, left and right side surfaces 10b and 10b, an upper surface 10c, and a rear surface 10d. The bay window portion 30 described above is provided at the boundary between the front surface 10a and the top surface 10c, and the stereo cameras 40 and 41 for front photography, the headlight 50, and the like are installed inside the bay window portion 30. This will be described later.

A front window 11 is provided on the front surface 10a. The front window 11 is covered with a transparent window plate 12 made of tempered glass or the like, and constitutes most of the front surface 10a of the cab 10. The upper surface 10c that extends rearward along the upper edge of the front surface 10a is covered with a panel (upper panel 25). A boarding gate 14a opened and closed by the door 14 is formed on the front side portion of the left side surface 10b of the cab 10.

The front window 11 is composed of an upper window and a lower window which are vertically divided. The upper window is formed vertically longer than the lower window. In the case of the cab 10, the vertical width of the upper window is approximately twice the vertical width of the lower window.

The lower window plate 12D covering the lower window is fixed to the cab 10. On the other hand, the upper window plate 12U that covers the upper window is configured to be openable and closable. That is, the upper window plate 12U is configured to be movable between the position where the upper window is closed shown in FIG. 2 and the position where the upper window is opened shown by the broken line in FIG. When the upper window is opened, the upper window plate 12U moves along the inside of the front surface 10a and the upper surface 10c, and then is housed inside the upper panel 24 of the upper surface 10c.

FIG. 4 shows a mechanism (opening / closing mechanism) that enables the upper window plate 12U to be opened / closed. The upper window plate 12U is made of rectangular plate-shaped tempered glass, and a window frame 15 is attached to the edge thereof. Rotatable rollers 16 are attached to the left and right edges of the upper window plate 12U at both upper and lower ends thereof.

Inside the cab 10, a pair of guide rails 17 and 17 are arranged so as to face each other in a state of extending along the inner edges of the front surface 10a and the upper surface 10c. The left and right rollers 16 and 16 of the upper window plate 12U are housed in the guide rails 17 and 17, and travel along the guide rails 17. Branch rails 17a projecting forward are provided at the portions of the guide rails 17 and 17 where the left and right upper corners of the upper window are located.

A sealing material 18 is attached to the lower edge of the upper window plate 12U along the width direction thereof. When the upper window is closed, the sealing material 18 attached to the lower edge of the upper window plate 12U comes into close contact with the upper edge 19 of the lower window plate 12D. The sealing material 18 may be attached to the upper edge 19 of the lower window plate 12D.

Then, by swinging the upper window plate 12U forward with the lower roller 16 as a fulcrum, the upper roller 16 enters the branch rail 17a, and the upper window plate 12U is a seal attached to the edge of the upper window. It is pressed against the material 20 from the rear and adheres to the material 20 (see the solid diagram of FIG. 6). In that state, the upper window plate 12U is locked to close the upper window.

After pulling the upper part of the upper window plate 12U toward you and pulling it out from the branch rail 17a (see the figure of the virtual line L1 in FIG. 6), the upper window plate 12U is slid backward according to the guide rail 17. Then, by moving the upper window plate 12U to the position where it is accommodated inside the upper surface 10c shown in FIGS. 3 and 4, and locking it to the striker 21, the upper window is held in the accommodated state.

As shown in FIG. 3, a pair of left and right vertical pillars 22, 22, a cross member 23, and the like are provided around the front window 11 in order to improve strength and rigidity. Each vertical pillar 22 is composed of a strut member having a closed cross-section structure (see FIG. 9), and extends in the vertical direction along the left and right side edges of the front window 11. The cross member 23 is made of a beam member that reinforces the front panel 26, extends laterally along the upper edge of the front window 11, and is joined to the upper portions of the left and right vertical pillars 22, 22.

In this hydraulic excavator 1, in order to form the bay window portion 30, a communication port 24 that opens horizontally along the upper side of the cross member 23 is formed at a curved boundary portion between the front surface 10a and the upper surface 10c. ..

<Bay window 30>
In recent years, an increasing number of models have cameras (stereo cameras) installed in cabs in order to manage the progress of construction and automatically control construction. Since the front of the cab is photographed, such a camera for front photography is generally arranged in the upper part of the front surface of the cab.

However, some conventional hydraulic excavators have a front window that opens and closes. This hydraulic excavator 1 is such a model, and when the upper window is opened and closed, the upper window plate 12U moves along the inside of the front surface 10a and the upper surface 10c of the cab 10. Therefore, even if the camera is to be mounted inside the front surface 10a and the top surface 10c of the cab 10, it cannot be mounted because the space through which the upper window passes is close to the inside.

The camera may be mounted outside the cab 10, but in that case, it is necessary to cover the periphery of the camera with a case, and since the structure protrudes from the cab 10, there is a risk of being caught or hit during work. Moreover, if rainwater or dust enters the case, there is a risk of image quality failure due to cloudiness or dirt, or damage to electrical components. If the airtightness of the case is improved, such a defect can be suppressed, but the case becomes large and complicated, and the manufacturing cost increases.

Therefore, in this hydraulic excavator 1, a bay window portion 30 is provided in the cab 10 to expand the room of the cab 10, and a camera is installed in the room of the expanded cab 10.

As shown in FIGS. 2 and 3, the bay window portion 30 has a horizontally long box shape, and the above-mentioned communication port 24 is provided in a state of slightly protruding from the boundary portion between the front surface 10a and the top surface 10c of the cab 10. It is integrally assembled to the cab 10 so as to cover it. A plurality of cameras 40L, 40R, 41L, 41R, a plurality of headlights 50, 50, and a viewing window portion 60 are provided inside the bay window portion 30.

FIG. 5 shows a view of the right side portion of the bay window portion 30 as viewed from the front. FIG. 6 shows a schematic cross-sectional view of the cab 10 at the portion indicated by the arrow line AA in FIG. FIG. 7 shows a schematic cross-sectional view of the bay window portion 30 at the portion indicated by the arrow line BB in FIG. FIG. 8 shows a schematic cross-sectional view of the bay window portion 30 at the portion indicated by the arrow line CC in FIG. FIG. 9 shows a schematic cross-sectional view of the cab 10 at the portion indicated by the arrow line DD in FIG.

The details of the bay window portion 30 will be described with reference to these figures. The structure of the left side portion of the bay window portion 30 is the same as that of the right portion of the bay window portion 30, except that the arrangement is symmetrical.

As shown in FIG. 6, the leading edge portion of the upper panel 25 constituting the upper surface 10c of the cab 10 is interposed at the upper edge portion of the front panel 26 constituting the front surface 10a of the cab 10 via a sealing material 27. Are connected. The front edge portion of the upper panel 25 and the upper edge portion of the front panel 26 form a boundary portion between the front surface 10a and the upper surface 10c of the cab 10, and a communication port 24 is formed therein.

The cross member 23 joins a prismatic reinforcing member 28 to a strip-shaped horizontal frame portion 26a of the front panel 26 extending in the lateral direction between the lower edge of the communication port 24 and the upper edge of the front window 11. It is constructed by (welding). The sealing material 20 that is in close contact with the closed upper window plate 12U described above is attached to the portion of the horizontal frame portion 26a that constitutes the upper edge of the front window 11. Then, the left and right guide rails 17 and the branch rails 17a are arranged along the front surface 10a and the upper surface 10c so that the upper window plate 12U can be arranged at that position.

The bay window portion 30 is composed of a bay window cover 31, a bay window plate 32, an interior cover 33, and the like. The bay window cover 31 is formed of a metal plate in a horizontally long box shape, and its lower edge portion 31a is joined to a cross member 23 forming the lower edge of the communication port 24. Specifically, the lower edge portion 31a is joined to the horizontal frame portion 26a in a state of covering the reinforcing member 28.

The upper edge portion 31b of the bay window cover 31 is joined to a portion of the upper edge portion of the front panel 26 that constitutes the upper edge of the communication port 24. As shown in FIGS. 5 and 9, the left and right end portions 31c and 31c of the bay window cover 31 are attached to the side edge portions of the front panel 26 and the left and right vertical pillars 22 forming the left and right edges of the communication port 24. It is joined.

A horizontally long bay window opening 31d is formed on the front surface of the bay window cover 31, and a bay window plate 32 is attached to the bay window cover 31 so as to cover the bay window opening 31d. The bay window plate 32 is made of a strip-shaped transparent tempered glass. A sealing material 34 is attached around the bay window plate 32, and the periphery of the bay window opening 31d is sealed by the sealing material 34. The bay window plate 32 is arranged so as to expand in a substantially vertical direction, and constitutes a flat surface portion located on the front side of the cross member 23 and facing forward.

The interior cover 33 is a removable partition member that covers the communication port 24 from the interior of the cab 10. The interior cover 33 is made of a horizontally long resin molded product, and the inside of the bay window portion 30 is hidden by the interior cover 33. In the hydraulic excavator 1, the interior cover 33 constitutes a partition chamber 35 and a viewing window portion 60, which will be described later.

As shown in FIGS. 5 and 9, in this hydraulic excavator 1, two stereo cameras 40 and 41, two headlights 50, and one viewing window portion 60 are provided inside the bay window portion 30. ing. Each of the stereo cameras 40 and 41 is composed of a pair of left and right cameras. The cameras 40L and 41L (left camera group) on the left side are only arranged symmetrically with respect to the cameras 40R and 41R (right camera group) on the right side as described above. Only shown, and detailed illustration thereof will be omitted.

The left camera group and the right camera group are arranged at each end of the bay window portion 30 so as to be located farthest from each other. Each headlight 50 is arranged adjacent to the inside of the left and right camera groups. The viewing window portion 60 is arranged in the middle portion of the bay window portion 30 between the left and right headlights 50.

By arranging the left and right camera groups at the farthest positions, the distance between the cameras (baseline length) is increased and the accuracy of shooting is improved. By arranging the headlights 50 adjacent to each camera group, it is possible to accurately illuminate the shooting locations of the stereo cameras 40 and 41. By arranging the viewing window portion 60 in the middle portion of the bay window portion 30, the visibility of the operator can be improved.

(Stereo cameras 40, 41)
As shown in FIG. 6, the two cameras 40L and 40R constituting one stereo camera 40 are arranged so that their optical axes extend substantially horizontally in order to photograph the front of the cab 10. The two cameras 41L and 41R constituting the other stereo camera 41 are arranged so that their optical axes extend diagonally downward and forward in order to photograph the obliquely downward front of the cab 10.

As shown in FIGS. 6 and 9, each of the right camera group and the left camera group is attached to the cross member 23 (specifically, the reinforcing member 28) via the camera support bracket 42. Therefore, even if the cab 10 shakes, each camera can be supported stably and firmly.

The two cameras that make up each of the right camera group and the left camera group are supported by one camera support bracket 42 in a state of being positioned with each other. Therefore, the relative positional relationship of these cameras can be stably maintained.

As shown in FIG. 9, the vertical pillar 22 is formed with a wiring hole 22a that communicates the inside of the vertical pillar 22 with the inside of the bay window portion 30. The cable 43 connected to each camera is led out to the inside of the vertical pillar 22 through the wiring hole 22a, and then introduced into the room of the cab 10.

As shown in FIG. 6, the bay window plate 32 is arranged in front of the cross member 23 to secure a space inside the bay window portion 30 that extends forward from the curved boundary portion of the front surface 10a and the upper surface 10c of the cab 10. As a result, the stereo cameras 40 and 41 can be installed inside the bay window portion 30 with a gap from the space through which the upper window plate 12U passes when opening and closing.

The alternate long and short dash line K shown in FIG. 6 represents the locus of the lower end portion (sealing material 18) of the upper window plate 12U passing closest to the front surface 10a and the upper surface 10c of the cab 10, and the inside thereof represents the upper window plate when opened and closed. It is a space through which 12U passes. Since there is a gap between the bay window portion 30 and the locus line K, contact with the upper window plate 12U that is opened and closed by providing the bay window portion 30 and installing the stereo cameras 40 and 41 inside the bay window portion 30. Can be avoided. Since the cable 43 is also wired through the bay window portion 30 and the vertical pillar 22, it does not affect the upper window plate 12U that is opened and closed. Therefore, even if the cab 10 opens and closes the front window 11, the stereo cameras 40 and 41 for front shooting can be installed without any trouble.

Further, since the bay window portion 30 is provided so as to project forward from the curved shape of the boundary portion between the front surface 10a and the upper surface 10c of the cab 10, the dimension protruding from the cab 10 can be minimized. Therefore, the risk of being caught or hit by the bay window portion 30 during work can be minimized.

Further, since the bay window portion 30 also structurally functions as a beam member, the strength and rigidity of the cab 10 are improved. Since the stereo cameras 40 and 41 are installed in the room of the cab 10, it is not necessary to cover them with a case that requires a high degree of waterproofness and dustproofness, and the influence of rainwater and dust can be effectively prevented. Since the stereo cameras 40 and 41 can be easily accessed, it is also advantageous in terms of work such as assembly and replacement.

(Headlight 50)
As shown in FIGS. 5 and 9, a partition room 35 having a partition other than the front surface is provided inside the bay window portion 30, and a headlight 50 is installed in the partition room 35.

Specifically, an outer wall portion 35a for partitioning the inside of the bay window portion 30 to the left and right is provided between each of the right camera group and the left camera group and each headlight 50. An inner wall portion 35b that partitions the inside of the bay window portion 30 to the left and right is also provided between each headlight 50 and the viewing window portion 60. The outer wall portion 35a and the inner wall portion 35b are provided on the front surface of the interior cover 33, and the rear portion of the headlight 50 is covered by the interior cover 33.

Then, as shown in FIGS. 7 and 9, the gap between each edge of the outer wall portion 35a and the inner wall portion 35b and the bay window cover 31, and the front end of each of the outer wall portion 35a and the inner wall portion 35b and the bay window plate 32. The gap between the two is closed by a sealing material 36 such as urethane foam. As a result, when the headlight 50 is turned on, the light is emitted only forward through the bay window plate 32. Therefore, since the light of the headlight 50 does not enter the camera lens or the room of the cab 10, it is possible to prevent shooting defects of the stereo cameras 40 and 41 and obstruction of the operator's field of view.

As shown in FIG. 7, each headlight 50 is also attached to the cross member 23 (specifically, the reinforcing member 28) via the light support bracket 51. Therefore, even if the cab 10 sways, each headlight 50 can be stably and firmly supported. Further, although not shown, a cable connected to each headlight 50 is also introduced into the room of the cab 10 after being led out to the inside of the vertical pillar 22 through the wiring hole 22a.

Since the headlight 50 is also installed inside the bay window portion 30 like the stereo cameras 40 and 41, the same effects as those of the stereo cameras 40 and 41 described above can be obtained.

(Peep window 60)
As shown in FIGS. 5, 8 and 9, in the hydraulic excavator 1, the viewing window portion 60 is configured by the interior cover 33.

The viewing window portion 60 has a horizontally long tubular shape, and is provided in an intermediate portion of the interior cover 33. The left and right side portions of the viewing window portion 60 are formed by the above-mentioned inner wall portion 35b. One opening 60a of the viewing window portion 60 faces the room of the cab 10, and the other opening 60b of the viewing window portion 60 faces the bay window plate 32 in the vicinity of the bay window plate 32.

Then, as shown by the arrow line Y1 in FIG. 8, when the operator operating in the room of the cab 10 tries to look diagonally forward above the cab 10, he / she can visually recognize it through the communication port 24 and the bay window plate 32. , The bay window portion 60 is configured. Therefore, even if the bay window portion 30 is provided, the workability is excellent.

(Bay window defroster 70)
When the outside air temperature is low, the bay window plate 32 and the camera lens may become cloudy or the bay window plate 32 may be covered with frost, making it difficult to take a picture or visually recognize the image. In such a case, in this hydraulic excavator 1, a bay window defroster 70 is installed inside the bay window portion 30 so that the fogging and frost can be removed.

As shown in FIGS. 6 and 9, the bay window defroster 70 of the hydraulic excavator 1 is composed of pipes, and a plurality of injection holes 71 arranged in a row at intervals are formed on the outer peripheral surface thereof. ing. The bay window defroster 70 is arranged over the entire area between the left and right ends of the bay window cover 31 in a state of extending laterally along the inside of the upper portion of the bay window cover 31 (specifically, the upper edge of the bay window opening 31d). ..

The injection directions of the plurality of injection holes 71 are directed to the inner surface of the bay window plate 32. The leftmost end of the bay window defroster 70 is sealed. The right end of the bay window defroster 70 extends rearward along the right end surface of the bay window cover 31 and is then introduced inside the right vertical pillar 22.

The bay window defroster 70 is configured to use the existing front window defroster 80 to blow air toward the bay window plate 32 and the stereo cameras 40 and 41.

As shown in FIG. 3, a front window defroster 80 is installed in the room of the cab 10. The front window defroster 80 has an air outlet 83 connected to the air conditioner 82 via a blower pipe 81. The air outlet 83 is arranged near the right edge of the front window 11. When the operator operates a switch (not shown), dry warm air is blown from the outlet 83 toward the front window 11.

Although not shown, a branch pipe 84 that branches the air blowing direction to the air outlet 83 is connected by providing a three-way joint in the middle of the air blowing pipe 81. As shown in FIG. 9, the branch pipe 84 extends upward through the inside of the vertical pillar 22 on the right side and is connected to the bay window defroster 70 described above.

Therefore, when the front window defroster 80 is operated to blow warm air to the front window 11, the warm air is also blown to the bay window defroster 70 accordingly. As a result, as shown by the arrow line Y2 in FIG. 6, warm air is blown out from each injection hole 71 to remove fogging of the bay window plate 32 and the camera lens and frost adhering to the bay window plate 32. As a result, the images taken by the stereo cameras 40 and 41 and the visual recognition through the viewing window 60 can be appropriately performed.

By using the existing front window defroster 80, the bay window defroster 70 is realized with a simple configuration, so that it can be realized inexpensively and easily. Since the piping is performed through the inside of the vertical pillar 22, contact with the upper window plate 12U that is opened and closed can be avoided.

The work machine related to the disclosed technology is not limited to the hydraulic excavator. It may be a crane or the like. Its use is not limited to construction work, but may be recycling work. The structure of the lower traveling body is also an example. It may be a work machine that runs on wheels instead of crawlers.

The bay window plate 32 may have a curved cross section as long as it has a flat surface portion. The interior cover 33 is not indispensable because the partition room 35 and the viewing window portion 60 may be configured as needed. The bay window defroster 70 may be configured independently of the front window defroster 80.

1 Hydraulic excavator (working machine)
2 Lower traveling body 3 Upper swivel body 4 Attachment 6 Machine room 10 Cab 10a Front 10c Upper surface 11 Front window 12 Window plate 12U Upper window plate 12D Lower window plate 22 Vertical pillar 23 Cross member 24 Communication port 30 Bay window 31 Bay window cover 32 Bay window Board (flat part)
33 Interior cover 35 Section room 40 Stereo camera 41 Stereo camera 50 Headlight 60 Peep window 70 Bay window defroster

Claims (6)

A work machine in which an upper swivel body with a cab is mounted on a lower traveling body.
The cab
The front, which is covered with a transparent window plate and has a front window that can be opened and closed by moving the window plate inside,
An upper surface that is connected to the upper edge of the front surface and spreads rearward, and the window plate is housed inside when the front surface is opened.
With a cross member extending laterally along the upper edge of the front window,
A communication port that opens at the boundary between the front surface and the upper surface along the upper side of the cross member.
A bay window that covers the communication port while protruding from the cab,
Have,
The bay window is
A bay window cover whose lower edge is integrally attached to the cross member,
A transparent bay window plate that is attached to the bay window cover and includes a flat surface portion that is located in front of the cross member and faces forward.
Have,
A work machine in which a camera for front photography is installed inside the bay window portion with a gap from the space through which the window plate passes when opening and closing. In the work machine according to claim 1,
A work machine in which a bay window defroster is further installed inside the bay window portion, and the bay window defroster blows air toward the bay window plate and the camera. In the work machine according to claim 2.
In the room of the cab, a front window defroster that blows air toward the front window is installed.
A work machine in which a branch pipe branched from a blower pipe of the front window defroster is connected to the bay window defroster through the inside of a vertical pillar extending along a side edge of the front window. In the work machine according to any one of claims 1 to 3.
Inside the bay window, a compartment is provided that is partitioned except for the front surface.
A work machine in which a headlight is further installed in the compartment. In the work machine according to claim 4,
A working machine in which each of the camera and the headlight is attached to the cross member via a support bracket. In the work machine according to any one of claims 1 to 5,
A work machine provided with a viewing window portion inside the bay window portion, which enables visual recognition diagonally forward above the cab through the communication port and the bay window plate.

Images