Working machinery

Abstract

To provide a work machine that can reliably receive radio waves from a wireless key and reliably perform the remote engine start function. [Solution] The present invention relates to a work machine 1 having a power unit that can be started by a wireless key carried by an operator, and includes a cab 5 in which the operator sits, a machine room 6 in which the power unit is housed, and a receiving device 8 that receives radio waves from the wireless key. The receiving device 8 is located inside the cab 5 and is positioned at least above the upper surface of the machine room 6.

Description

Technical Field

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[0001] The present invention relates to a working machine.

Background Art

[0002] For example, Patent Document 1 discloses a construction machine that employs a wireless key capable of starting a drive source without inserting a key into a keyhole.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a working machine that employs a wireless key as described above, it is required that the engine can be started by operating the wireless key even when the operator is at a position away from the working machine (hereinafter referred to as "remote engine start function").

[0005] When realizing this function, it is necessary to arrange a receiving device on the working machine that receives radio waves from the wireless key. On the other hand, a working machine includes larger structures compared to a passenger vehicle, such as power equipment, hydraulic equipment, and heat exchangers. In addition to the above structures, the working machine also includes many members that shield radio waves from the wireless key, such as counterweights. Therefore, depending on the location where the receiving device is arranged on the working machine, problems may occur, such as the distance at which the receiving device can receive radio waves being significantly reduced.

[0006] An object of the present invention is to provide a working machine that can stably receive radio waves from a wireless key and reliably exhibit a remote engine start function.

Means for Solving the Problems

[0007] The present invention provides a work machine having a power unit that can be started by a wireless key carried by an operator. The work machine comprises a cab in which the operator sits, a machine room housing the power unit, and a receiving device that receives radio waves from the wireless key, wherein the receiving device is located inside the cab and above the top surface of the machine room.

[0008] In the work machine of the present invention, the upper surface of the machine room preferably includes a maintenance passage that can be used as a platform for the worker during maintenance, and the receiving device is preferably located above the outer surface of the maintenance passage.

[0009] In the work machine of the present invention, it is preferable that the receiving device is covered and concealed by an interior panel inside the cab.

[0010] In the work machine of the present invention, it is preferable that the receiving device is located on the ceiling of the cab.

[0011] In the work machine of the present invention, it is preferable that the receiving device is positioned behind the center position in the front-to-back direction of the ceiling portion.

[0012] In the work machine of the present invention, the cab includes a first side wall with a door through which the worker can enter and exit, and a second side wall located on the opposite side of the first side wall, and it is preferable that the receiving device is located on the side of the second side wall rather than the center position in the width direction of the cab.

[0013] In the work machine of the present invention, the cab includes a floor, a ceiling, and a plurality of support columns connected to the floor and ceiling, and it is preferable that the receiving device is located on one of the plurality of support columns.

[0014] In the work machine of the present invention, the cab includes a first side wall with a door through which the worker can enter and exit, a second side wall located on the opposite side of the first side wall, a driver's seat in which the worker can sit, and a rear wall located behind the driver's seat, and the plurality of support columns include a first support column connected to the second side wall and the rear wall, and it is preferable that the receiving device is located on the first support column.

[0015] The work machine of the present invention includes a lower traveling body and an upper rotating body that is rotatably mounted on the lower traveling body, wherein the upper rotating body includes the cab and the machine room, and in a top view of the work machine, the machine room is arranged to surround the rear and right sides of the cab, and it is desirable that the first support column has the smallest distance from the rotation center of the upper rotating body among the plurality of support columns.

[0016] The work machine of the present invention includes a lower traveling body and an upper rotating body that is rotatably mounted on the lower traveling body, the upper rotating body includes a cab and a machine room, the cab includes a plurality of support columns extending in the vertical direction, and preferably the receiving device is located on the support column that is closest to the pivot center of the upper rotating body among the plurality of support columns.

[0017] In the work machine of the present invention, the cab is provided with a transmitting device that transmits radio waves for determining whether the wireless key is present inside the cab, and it is preferable that the transmitting device is located below the upper surface of the machine room. [Effects of the Invention]

[0018] By adopting the above-mentioned features, the work machine of the present invention can stably receive radio waves from a wireless key and reliably perform the remote engine start function. [Brief explanation of the drawing]

[0019] [Figure 1] Figure 1 is a side view of a work machine according to one embodiment of the present invention. [Figure 2]FIG. 2 is a top view of the working machine of FIG. 1. [Figure 3] FIG. 3 is a perspective view showing an example of the receiving device. [Figure 4] FIG. 4 is an enlarged perspective view of the cab of FIG. 1. [Figure 5] FIG. 5 is an enlarged side view of the machine room of FIG. 1. [Figure 6] FIG. 6 is a front view of the receiving device arranged on the first support portion. [Figure 7] FIG. 7 is a top view of the ceiling portion of the cab. [Figure 8] FIG. 8 is a side view of the working machine according to another embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view of the first support portion and the receiving device according to another embodiment of the present invention. [Figure 10] FIG. 10 is a schematic view when the receiving device of FIG. 9 is observed from its front side. [Figure 11] FIG. 11 is a schematic view when the receiving device of FIG. 9 is observed from its left side.

Embodiments for Carrying Out the Invention

[0020] Hereinafter, the working machine 1 according to an embodiment of the present invention will be described based on the drawings. Although the drawings describe the features of the present invention, in order to assist in understanding the present invention, there may be exaggerated expressions or expressions different from the actual structural dimensional ratios. Also, throughout each embodiment, the same or common elements are denoted by the same reference numerals, and duplicate explanations are omitted. In addition, well-known configurations can be appropriately adopted for configurations not described in this specification.

[0021] Figure 1 is a side view of the work machine 1 according to this embodiment, and Figure 2 is a top view of the work machine 1. In each figure of this specification, directions are indicated by arrows. As shown in Figure 1, arrow Up indicates the upward direction. Arrow Dw indicates the downward direction. Arrow Fw indicates the forward direction in the front-rear direction of the work machine 1. Arrow Rr indicates the rearward direction in the front-rear direction. As shown in Figure 2, arrow Rh indicates the rightward direction in the vehicle width direction of the work machine 1. Arrow Lf indicates the leftward direction in the vehicle width direction of the work machine 1.

[0022] As shown in Figures 1 and 2, the work machine 1 of this embodiment is, for example, a 7-13 ton class hydraulic excavator. Therefore, the work machine 1 of this embodiment includes a lower traveling body 2 that generates driving force and an upper rotating body 3 that is rotatably mounted on the lower traveling body 2. The lower traveling body 2 of this embodiment is of the crawler type, but is not limited to this, and may, for example, generate driving force using multiple tires. Unless otherwise specified, the figures in this specification show the upper rotating body 3 and the lower traveling body 2 in an aligned state. The upper rotating body 3 also includes an arm 4a and a bucket 4b attached to the tip of the arm 4a. The work machine 1 of this embodiment can perform excavation work, etc., by operating the bucket 4b. However, the work machine 1 of the present invention is not limited to this form, and may be, for example, a bulldozer or a crawler crane.

[0023] The work machine 1 is equipped with a remote engine start function. Therefore, the work machine 1 has a power unit that can be started by a wireless key carried by the operator. The work machine 1 also includes a cab 5 in which the operator sits, a machine room 6 housing the power unit, a receiving device 8 (shown by a dashed line in Figures 1 and 2) that receives radio waves from the wireless key, and a control unit that inputs a start command signal to the power unit in response to the receiving device 8 receiving radio waves. In this embodiment, all of these components are located on the upper rotating body 3. In this embodiment, one wireless key is used for one work machine 1. Therefore, the "operator" in this embodiment is assumed to be the operator who rides and drives the work machine 1. However, the present invention is not limited to this embodiment, and for example, an embodiment in which two wireless keys are used for one work machine 1 is also included. In this case, for example, one wireless key is assumed to be held by the operator who rides and drives the work machine 1, and the other wireless key is assumed to be held by a person who does not ride the work machine 1 (for example, a person who monitors the operation of the work machine 1 from the outside). In this invention, from the perspective of including such embodiments, the workers who carry the wireless key may include not only the driver but also those who are not on board the work machine 1.

[0024] In Figures 1 and 2, the area enclosed by the dashed line 5a corresponds to the cab 5. As shown in Figure 2, the cab 5 of this embodiment is located Lf to the left of the pivot center 3c of the upper rotating body 3 in a top view of the work machine 1. Furthermore, in the top view, the cab 5 of this embodiment overlaps with a virtual line (not shown) extending in the width direction of the work machine 1 through the pivot center 3c. The center position of the cab 5 in the front-rear direction is located in front of the pivot center 3c. The cab 5 is a box-shaped structure in which a driver's seat where an operator can sit is arranged. The cab 5 of this embodiment includes an internal space that is sealed to the extent that, for example, flying stones and the like do not enter. However, the cab 5 of the present invention is not limited to this configuration, and the interior may be open without being partitioned by glass or the like.

[0025] In Figure 2, the area enclosed by the dashed-dot line 6a corresponds to the machine room 6. As shown in Figure 2, in a top view of the work machine 1, the machine room 6 is positioned to surround the rear Rr and right Rh of the cab 5. The machine room 6 also includes a first part 11, which is located behind the cab 5 and the pivot center 3c in the top view, and a second part 12, which is located to the right of the pivot center 3c in the top view. In Figure 2, the boundary between the first part 11 and the second part 12 is shown by the dashed-dot line 6b. This boundary causes the first part 11 and the second part 12 to be rectangular in shape in the top view. The machine room 6 houses not only power equipment but also hydraulic equipment, heat exchangers, and the like. A counterweight 15 is located at the rear Rr of the machine room 6 to enhance the stability of the upper slewing body 3 during rotation.

[0026] Figure 3 is a perspective view showing an example of the receiving device 8. The receiving device 8 is configured as an RF antenna capable of receiving RF radio waves from a wireless key. RF radio waves are radio waves in a higher frequency band than LF radio waves (radio waves in a frequency band of approximately 30 to 300 kHz) transmitted from the work machine 1 toward the wireless key for authentication. The RF radio waves in this embodiment have a frequency band of approximately 300 to 500 MHz, which is typical for use in remote engine start functions. The receiving device 8, configured as an RF antenna, is susceptible to interference from materials that block radio waves. Therefore, depending on the placement of the receiving device 8 on the work machine 1, problems may occur such as the distance between the receiving device 8 and the wireless key at which the receiving device 8 can receive radio waves (hereinafter referred to as the "receivable distance") becoming significantly smaller.

[0027] The receiving device 8 of this embodiment can transmit commands from a wireless key to the control unit (not shown) of a power equipment via cable 8a. Figure 3 also shows a connecting fitting 8b for attaching the receiving device 8 to another component. Without cable 8a and connecting fitting 8b, the receiving device 8 has, for example, a rectangular parallelepiped shape. Note that in diagrams schematically showing the position of the receiving device 8, such as Figures 1 and 2, the cable 8a and connecting fitting 8b shown in Figure 3 may be omitted. The receiving device 8 of this embodiment has, for example, a flattened rectangular parallelepiped shape with a width W1 smaller than the total length L1 and a thickness t1 smaller than the width W1. Generally, the manufacturer specifies a mounting orientation (hereinafter referred to as the "recommended mounting position") that allows the receiving device 8 to exhibit the best radio wave sensitivity. In this embodiment, the recommended mounting position for the receiving device 8 is when the reference axis direction (in this embodiment, the longitudinal direction constituting the total length L1) is parallel to the vertical direction.

[0028] Figure 4 is an enlarged perspective view of the cab 5 as seen from the left rear. As shown in Figure 4, the receiving device 8 is located inside the cab 5 and above the top surface of the machine room 6 (shown in Figure 1). In Figures 1, 2, and 4, the receiving device 8 is schematically shown by a dashed line. When the receiving device 8 is located in the above position, the radio waves are not shielded by the machine room 6, so the receiving device 8 can stably receive radio waves from the wireless key. Therefore, the work machine 1 of the present invention can reliably perform the remote engine start function.

[0029] The configuration of this embodiment will be described in more detail below. Note that each configuration described below represents a specific aspect of this embodiment. Therefore, it goes without saying that the present invention can achieve the above-described effects even without the configurations described below. Furthermore, even if any one of the configurations described below is applied individually to the work machine 1 of the present invention having the above-described features, an improvement in performance corresponding to each configuration can be expected. Moreover, if several of the configurations described below are applied in combination, a combined improvement in performance corresponding to each configuration can be expected.

[0030] As shown in Figures 1 and 2, the machine room 6 includes a cover 13 that can be opened during maintenance. A maintenance passage 14 is also provided around the cover 13, which can be used as a platform for workers during maintenance. In Figures 1 and 2, the outer surface of the cover 13 is marked with dots. In this embodiment, the area of ​​the machine room 6's outer surface excluding the outer surface of the cover 13 is configured as the maintenance passage 14, which can be used as a platform for workers.

[0031] Figure 5 shows an enlarged side view of the machine room 6 as observed from the right side Rh of the work machine 1. Note that in Figure 5, the lower traveling body 2 and the tip of the arm 4a, which are shown in Figures 1 and 2, are omitted. As shown in Figure 5, in the second part 12 of the machine room 6, the outer surface of the maintenance passage 14 includes a main body surface 14a at the same height as the outer surface of the first part 11, and a lower step surface 14b located lower than the main body surface 14a. The receiving device 8 (shown in Figure 4) of this embodiment is located above the outer surface (upper surface) of the maintenance passage 14. That is, the receiving device 8 is located above at least the lower step surface 14b of the maintenance passage 14, and preferably above the main body surface 14a of the maintenance passage 14. Even in this embodiment, the above-mentioned effects can be fully obtained. In a more desirable embodiment, the receiving device 8 is located above the upper surface of the lid 13 of the machine room 6. This prevents radio waves from being blocked by the machine room 6, making it possible to increase the receiving range of the receiving device 8.

[0032] As shown in Figure 4, the actual cab 5 has a frame 20 (partially shown by a dashed line) and an interior panel 35 (omitted in Figure 4, but shown in Figure 6, which will be described later) that covers this frame 20. It is desirable that the receiving device 8 be concealed by this interior panel. This improves the appearance inside the cab 5. In addition, since the receiving device 8 is not exposed, problems such as workers coming into contact with the receiving device 8 can be prevented.

[0033] The cab 5 includes a floor 21, a ceiling 22, and a plurality of support columns 23 (shown by dashed lines) connected to the floor 21 and ceiling 22. The receiving device 8 is preferably located on one of the plurality of support columns 23. This allows the support columns 23 to act as protective members for the receiving device 8. For example, even if a large impact is transmitted to the cab 5, the support columns 23 can absorb the impact and prevent damage to the receiving device 8. The specific support column 23 on which the receiving device 8 is located will be described later.

[0034] As described above, the cab 5 is constructed as a box-shaped structure. Therefore, as shown in Figure 2, the cab 5 includes a first side wall 26, a second side wall 27, a front wall 28, and a rear wall 29, and a driver's seat (not shown) surrounded by these. As shown in Figure 4, the first side wall 26 includes a door through which workers can enter and exit, and in this embodiment is located on the left side Lf of the driver's seat. As shown in Figure 2, the second side wall 27 is located on the opposite side of the first side wall 26, and in this embodiment is located on the right side Rh of the driver's seat. The front wall 28 is the wall in front of the driver's seat Fw, and the rear wall 29 is the wall behind the driver's seat Rr.

[0035] If the receiving device 8 is far from the pivot center 3c of the upper rotating body 3, the distance between the receiving device 8 and the wireless key will change significantly depending on the pivot position of the upper rotating body 3, which may cause the following problems. For example, if the distance from the wireless key to the pivot center 3c is 10m and the distance from the receiving device 8 to the pivot center 3c is Xm, then depending on the pivot position of the upper rotating body 3, the shortest distance from the wireless key to the receiving device 8 will be (10-X)m and the longest distance will be (10+X)m.

[0036] When the aforementioned distance X is large, the difference between the shortest distance and the longest distance described above becomes large. For this reason, even if the distance from the wireless key to the pivot center 3c is the same, depending on the pivot position of the upper pivot body 3, the remote engine start function may be activated at the shortest distance, but at the longest distance, the radio waves may not reach and the function may not be activated (engine cannot be started). To prevent such problems, it is desirable that the remote engine start function be activated stably regardless of the pivot position of the upper pivot body 3 as much as possible, provided that the distance from the wireless key to the pivot center 3c is the same. Therefore, it is desirable that the distance of the receiving device 8 to the pivot center 3c be as small as possible.

[0037] From this perspective, the receiving device 8 of this embodiment is located on the second side wall 27 side (towards the pivot center 3c) of the cab 5's widthwise center, and more preferably, it is located in the region closest to the second side wall 27 within the three equal parts obtained by dividing the cab 5 in the widthwise direction. This mitigates the aforementioned problems.

[0038] In cab 5, it is desirable to ensure a large forward field of view for the operator. On the other hand, even if the receiving device 8 is concealed by the interior panel of cab 5, the surrounding interior panel may need to be enlarged to accommodate the receiving device 8. For this reason, it is desirable to position the receiving device 8 in a location that does not obstruct the operator's forward field of view as much as possible. From this viewpoint, it is desirable that the receiving device 8 be positioned behind the center of cab 5 in the front-to-rear direction. In a more desirable configuration, the receiving device 8 is positioned in the area closest to the rear wall 29 of the region obtained by dividing cab 5 into three equal parts in the front-to-rear direction. In an even more desirable configuration, the receiving device 8 is positioned behind the driver's seat headrest (not shown).

[0039] As shown in Figure 4, the multiple support columns 23 include a first support column 31 connected to the second side wall 27 and the rear wall 29. That is, the first support column 31 is positioned to extend vertically inside the corner between the second side wall 27 and the rear wall 29. In this embodiment, the first support column 31 corresponds to the support column 23 located to the right rear of the driver's seat. From the viewpoint of satisfying the above-mentioned arrangement requirements for the receiving device 8, the receiving device 8 in this embodiment is positioned on the first support column 31. The first support column 31 has the smallest distance from the pivot center 3c of the upper slewing body 3 among the multiple support columns 23. As a result, the work machine 1 in this embodiment can reliably perform the remote engine start function even when the pivot position of the upper slewing body 3 changes, and a wide forward field of view can be secured from the driver's seat.

[0040] Figure 6 shows a front view of the receiving device 8 located on the first support column 31. Figure 6 is a front view of the first support column 31 and the receiving device 8 when viewed from the driver's seat side towards the rear Rr. In Figure 6, a portion of the interior panel 35 is omitted, and the receiving device 8 located on the first support column 31 is shown. The outline of the omitted portion is indicated by a dashed line 35a. As shown in Figure 6, a beam member 33 extending from the first side wall 26 (shown in Figure 4) is connected to the first support column 31, and a gusset plate 37 is provided between the first support column 31 and the beam member 33 (inside the corner) to reinforce them. The gusset plate 37 is, for example, a right-angled triangular steel plate, with one of the two sides forming the right angle welded to the side of the first support column 31 and the other welded to the underside of the beam member 33.

[0041] The receiving device 8 is provided on the side of the first support column 31. In this embodiment, it is provided on the left side Lf of the first support column 31, which is easily accessible from inside the cab 5 (in other words, the side facing the inside of the cab 5 among the sides facing the vehicle width direction). This improves the workability when installing and maintaining the receiving device 8. However, it is not limited to this configuration, and the receiving device 8 may be provided on any of the front side Fw, rear side Rr, or right side Rh of the first support column 31. In this embodiment, a cable fixing device 36 is provided on the aforementioned side, to which the cable 8a and connecting fittings 8b of the receiving device 8 are attached. It is preferable that the receiving device 8 be positioned directly below the gusset plate 37, for example, and although the receiving device 8 and the gusset plate 37 are not in contact, the shortest distance between the receiving device 8 and the gusset plate 37 is 50 mm or less.

[0042] It is desirable that the receiving device 8 be mounted on the first support column 31 in a position as close as possible to the recommended mounting position (shown in Figure 3). However, depending on the positional relationship with the gusset plate 37, the receiving device 8 may be mounted at a certain degree of inclination relative to the recommended mounting position. In this case, it is desirable that the receiving device 8 be mounted such that the reference axis direction of the mounted receiving device 8 (in this embodiment, the longitudinal direction of the receiving device 8) is at an angle of, for example, 15° or less with respect to the reference axis direction of the receiving device 8 in the recommended mounting position. This prevents the receiving distance of the receiving device 8 from becoming excessively small.

[0043] The above-described embodiment is particularly effective when, in the recommended mounting position, the longitudinal direction of the receiving device 8 needs to be brought closer to the vertical direction. On the other hand, depending on the type of receiving device 8, in the recommended mounting position, it may be required that the longitudinal direction of the receiving device 8 be brought closer to the horizontal direction. In this case, it is desirable that the receiving device 8 be placed, for example, inside the ceiling portion 22 of the cab 5, particularly inside the ceiling portion 22. This allows the receiving device 8 to be positioned without difficulty.

[0044] Figure 7 shows an enlarged top view of the ceiling 22 of the cab 5. In Figure 7, the position of the receiving device 8 on the ceiling 22 is conceptually shown by a dashed line. As shown in Figure 7, when the receiving device 8 is located on the ceiling 22, it is desirable that the receiving device 8 be located behind the center position 22a in the front-rear direction of the ceiling 22. Furthermore, it is desirable that the receiving device 8 be located closer to the second side wall 27 than the center position 22b in the width direction of the ceiling 22. This brings the receiving device 8 closer to the pivot center of the upper rotating body 3, allowing the remote engine start function to be performed stably.

[0045] Figure 8 shows a side view of a work machine 1 according to another embodiment of the present invention. As shown in Figure 8, the work machine 1 of the present invention may be a rearward-swinging model with a relatively small swing range of the upper swinging body 3, or a so-called mini excavator weighing 6 tons or less.

[0046] Figures 9 to 11 show yet another embodiment in which the receiving device 8 is arranged on the first support column 31. Figure 9 is a perspective view of the first support column 31 and the receiving device 8 in this embodiment. Note that in Figure 9, the interior panel 35 (exemplified in Figure 6) that covers the first support column 31 and the receiving device 8 is omitted. Figure 10 is a schematic diagram of the receiving device 8 in this embodiment as viewed from its front side Fw. Figure 11 is a schematic diagram of the receiving device 8 in this embodiment as viewed from its left side Lf.

[0047] As shown in Figures 9 and 11, in this embodiment, the receiving device 8 is mounted on the left side Lf of the first support column 31 at a position away from the inner surface of the rear window 40 of the cab 5. This prevents damage to the receiving device 8 in the event of damage to the rear window 40, while still allowing for sufficient remote engine starting functionality. The shortest distance from the receiving device 8 to the inner surface of the rear window 40 is, for example, 20 to 50 mm. However, the shortest distance in this embodiment is not limited to this range.

[0048] A partial covering member 41 is provided on the inner surface of the rear window 40 to conceal the first support column 31 and the receiving device 8. In this embodiment, the receiving device 8 is surrounded on all four sides by the covering member 41, the interior cover (not shown), and the first support column 31. As a result, the receiving device 8 is not visible from inside or outside the cab 5, improving the aesthetic appearance.

[0049] In this embodiment, a tubular cable fastener 36 extending vertically is provided on the left side Lf of the first support column 31. The cable 8a of the receiving device 8 can be passed through the inside of this cable fastener 36. The receiving device 8 is attached to the upper end of the cable fastener 36 via a metal bracket 45.

[0050] The bracket 45 is a component manufactured, for example, by bending a single metal plate, and includes a front portion 46, a main body portion 47, and a rear portion 48. The front portion 46 is bolted to the front Fw surface of the upper end of the cable fastener 36 and is planar, extending in the same direction as the rear window 40. The main body portion 47 is connected to the left side Lf of the front portion 46 and extends at a slight inclination relative to the left side Lf of the first support portion 31. The receiving device 8 is bolted to the main body portion 47. The rear portion 48 is connected to the rear side Rr of the main body portion 47 and extends along the rear window 40. The rear portion 48 also extends to the opposite side (left side) from the front portion 46 relative to the main body portion 47. As a result, the bracket 45 is bent at right angles between the main body portion 47 and the front portion 46, and between the main body portion 47 and the rear portion 48.

[0051] As shown in Figure 10, when the receiving device 8 is observed from the front Fw, it is desirable that the entire receiving device 8 overlaps with the rear portion 48 of the bracket 45. In other words, as shown in Figure 9, when the bracket 45 is observed from the rear Rr, the receiving device 8 is completely hidden by the rear portion 48. This ensures that even if the rear window 40 is damaged, the receiving device 8 can be protected by the rear portion 48 of the bracket 45.

[0052] As shown in Figure 4, the cab 5 is equipped with a transmitter 9. This transmitter 9 is used to detect whether a wireless key is present inside the cab 5 (in other words, whether a worker is inside the cab). The transmitter 9 is configured as an LF antenna that transmits LF radio waves. When the wireless key is present inside the cab 5 and receives the LF radio waves, the wireless key transmits a response radio wave. Through this transmission and reception, it is determined whether the wireless key is present inside the cab 5.

[0053] On the other hand, depending on the placement of the transmitter 9, the aforementioned transmission and reception of radio waves may occur even if the wireless key is outside the cab 5. From the perspective of preventing such malfunctions, it is desirable that the transmitter 9 be located below the top surface of the machine room 6 (shown in Figure 2). More specifically, the transmitter 9 is located below the top surface of the first part 11 of the machine room 6, excluding the cover 13. This prevents the LF radio waves transmitted by the transmitter 9 from being transmitted unnecessarily far away. Therefore, even in situations where the wireless key is located higher than the top surface of the machine room 6 and misrecognition is likely to occur, such as when a worker is on the maintenance passage 14 (shown in Figure 5) with the wireless key in their possession, it is possible to accurately determine that the wireless key is not inside the cab 5.

[0054] In the embodiment shown in Figure 4, the transmitter 9 is located on the first support column 31. This brings the transmitter 9 closer to the machine room 6, further enhancing the effects described above. However, the transmitter 9 is not limited to this arrangement; for example, it may be located inside the second side wall 27. Even in this case, the second part 12 of the machine room 6 prevents the LF radio waves from being transmitted unnecessarily far away.

[0055] Although particularly preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the illustrated embodiments and can be implemented in various modified forms. [Industrial applicability]

[0056] As described above, the present invention is useful as a work machine. [Explanation of symbols]

[0057] 1. Working Machinery 5 Cab 6 Machine room 8. Receiving device

Claims

1. Power equipment that can be started by a wireless key carried by the worker, The cab in which the aforementioned worker sits, The machine room housing the aforementioned power equipment, A receiving device that receives radio waves from the aforementioned wireless key, Equipped with, The receiving device is located inside the cab and above the upper surface of the machine room. Agricultural machinery.

2. The upper surface of the machine room includes a maintenance passage that can be used as a platform for the worker during maintenance. The work machine according to claim 1, wherein the receiving device is located above the outer surface of the maintenance passage.

3. The work machine according to claim 2, wherein the receiving device is concealed by an interior panel inside the cab.

4. The receiving device is located on the ceiling of the cab, as described in any one of claims 1 to 3.

5. The work machine according to claim 4, wherein the receiving device is positioned behind the center position in the front-to-back direction of the ceiling.

6. The cab includes a first side wall with a door through which the worker can enter and exit, and a second side wall located on the opposite side of the first side wall. The working machine according to any one of claims 1 to 3, wherein the receiving device is located on the second side wall side of the center position in the width direction of the cab.

7. The cab includes a floor, a ceiling, and a plurality of support columns connected to the floor and the ceiling. The work machine according to any one of claims 1 to 3, wherein the receiving device is located on any of the plurality of support columns.

8. The cab includes a first side wall with a door through which the worker can enter and exit, a second side wall located on the opposite side of the first side wall, a driver's seat in which the worker can sit, and a rear wall located behind the driver's seat. The plurality of support columns include a first support column connected to the second side wall and the rear wall, The work machine according to claim 7, wherein the receiving device is located on the first support column.

9. It includes a lower traveling body and an upper swivel body that is rotatably mounted on the lower traveling body, The upper rotating body includes the cab and the machine room, In a top view of the aforementioned work machine, the machine room is arranged to surround the rear and right side of the cab. The work machine according to claim 8, wherein the first support column is the one with the smallest distance from the pivot center of the upper rotating body among the plurality of support columns.

10. It includes a lower traveling body and an upper swivel body that is rotatably mounted on the lower traveling body, The upper rotating body includes the cab and the machine room, The cab includes a plurality of support columns extending in the vertical direction, The working machine according to any one of claims 1 to 3, wherein the receiving device is located on the support column that is closest to the pivot center of the upper rotating body among the plurality of support columns.

11. The cab is equipped with a transmitting device that transmits radio waves to determine whether the wireless key is present inside the cab. The working machine according to any one of claims 1 to 3, wherein the transmitting device is located below the upper surface of the machine room.

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