Work machine

Abstract

To provide a work machine that can reduce the load applied to an antenna main body when the position of the antenna main body is changed.SOLUTION: An antenna device 20 supported on an upper part of cab 11 includes: a mounting unit 24 supported on the cab 11; a height changing unit 26 supported on the mounting unit 24; an antenna main body 22 supported on the height changing unit 26; and an operation unit 28 for receiving an operation to displace the height changing unit 26 relative to the mounting unit 24 in order to change the height of the upper end part of the antenna main body 22.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to the structure of an antenna device in a work machine. [Background technology]

[0002] For example, an antenna device for remote control is attached to a work machine such as a hydraulic excavator. For example, Patent Document 1 discloses a structure in which an antenna main body for receiving commands based on the operation of an operating device in a remote control room is attached to the top of an upper rotating body. Furthermore, Patent Document 2 discloses a technology in which the antenna main body attached to the roof of a work machine can be arranged in either a first arrangement position that positions the antenna main body below the top of the roof or a second arrangement position that positions the antenna main body above the top of the roof. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-35645 [Patent Document 2] International Publication No. 2018 / 179409 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, with the configuration described in Patent Document 1, when transporting a work machine, such as when shipping it from a factory, it becomes necessary to remove the antenna body to comply with transport height regulations, making the work complicated. In contrast, with the configuration described in Patent Document 2, the position of the antenna body can be changed when transporting a work machine, eliminating the need to remove the antenna body. However, with the configuration of Patent Document 2, when changing the position of the antenna body, the worker must hold the antenna body, which places a load on the antenna body.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a work machine that can reduce the load on the antenna body when changing the position of the antenna body. [Means for solving the problem]

[0006] A work machine according to a first aspect comprises a work machine body and an antenna device supported on the upper part of the work machine body, and the antenna device comprises a mounting part supported on the work machine body, a height change part supported on the mounting part, an antenna body supported on the height change part, and an operating part that receives an operation to displace the height change part relative to the mounting part in order to change the height of the upper end part of the antenna body.

[0007] According to the above aspect, when changing the height of the upper end of the antenna body, the height of the upper end of the antenna body is changed by operating the operating unit to displace the height change unit, so that the worker does not have to grab the antenna body during work, and the load on the antenna can be reduced.

[0008] A second aspect is preferably the work machine according to the first aspect, further comprising the following feature: That is, in the work machine according to the second aspect, the height changing unit includes a rotary support shaft attached to the mounting unit and a rotary support part attached so as to be rotatable about the axis of the rotary support shaft, and the antenna body and the operating unit are attached to the rotary support part. In this second aspect, when the operating unit is operated, the rotary support part and the antenna body are rotated about the axis of the rotary support shaft, thereby changing the height of the upper end of the antenna body.

[0009] A third aspect is preferably the work machine according to the second aspect, further comprising the following feature: That is, in the work machine according to the third aspect, the antenna body is formed in an elongated shape, and is supported by the rotary support part so as to be displaceable between a usage position in which the longitudinal direction of the antenna body is disposed along the vertical direction, and a storage position in which the longitudinal direction of the antenna body is disposed along the horizontal direction. In this third aspect, by operating the operating part, the antenna body can be displaced between the usage position in which radio waves can be easily received and the storage position suitable for transporting the work machine.

[0010] A fourth aspect is preferably a work machine according to the second or third aspect, further comprising the following feature. That is, in the work machine according to the fourth aspect, the antenna device further comprises a rotation limiting mechanism that limits rotation of the rotation support part about the axis of the rotation support shaft. In this fourth aspect, when the operation part is not being operated, the rotation of the operation part and the rotation support part about the rotation support shaft is limited by the rotation limiting mechanism, thereby preventing unintended rotation of the antenna main body. Furthermore, when the operating force applied to the operation part reaches a predetermined level or more, the operation part, the rotation support part, and the antenna main body can be rotated against the rotation limit imposed by the rotation limiting mechanism.

[0011] A fifth aspect is preferably a work machine according to any one of the first to fourth aspects, further comprising the following feature: That is, in the work machine according to the fifth aspect, the mounting portion is arranged in a position where it overlaps with the work machine body when viewed from above, and the antenna body is arranged in a position where at least a portion of it does not overlap with the work machine body when viewed from above. In this fifth aspect, the antenna body can be arranged in a position where it is easy to send and receive radio waves.

[0012] A sixth aspect is preferably a work machine according to any one of the second to fourth aspects, further comprising the following feature: That is, in the work machine according to the sixth aspect, the operating unit is arranged such that, when viewed in the radial direction of the rotation support shaft and in a direction perpendicular to the center line of the operating unit, the center line of the operating unit falls between one end and the other end of the rotation support unit in the axial direction of the rotation support shaft among the parts supported by the rotation support shaft. In this sixth aspect, because the center line of the operating unit is arranged to fall between one end and the other end of the rotation support unit among the parts supported by the rotation support shaft, twisting is less likely to occur in the operating unit and the rotation support unit when the operating unit is operated.

[0013] A seventh aspect is preferably a work machine according to the third aspect, further comprising the following feature: In other words, in the work machine according to the seventh aspect, the operating unit is formed in an elongated shape, and when the antenna body is in the use position, the operating unit assumes an upright position with its longitudinal direction aligned vertically, and when the antenna body is in the stored position, the operating unit assumes a laid-down position with its longitudinal direction aligned horizontally. In this seventh aspect, the position of the operating unit is the same as the position of the antenna body, making it easier to operate the operating unit.

[0014] An eighth aspect is a work machine according to the seventh aspect, further comprising the following feature: In other words, in the work machine according to the eighth aspect, the operating unit includes a base end attached to the rotation support part, and a bent portion extending from the base end so as to be bent relative to the base end. In this eighth aspect, the bent portion of the operating unit does not overlap with the antenna main body, preventing the bent portion from being hidden by the antenna main body and becoming difficult to see.

[0015] A ninth aspect is the work machine according to the eighth aspect, and it is desirable that it further include the following feature. That is, in the work machine according to the ninth aspect, the base end has a shape that extends horizontally when the operation unit is in the laid-down position, and extends vertically when the operation unit is in the upright position. In this ninth aspect, the base end is arranged so as to overlap the antenna body, allowing the antenna to be configured compactly.

[0016] A tenth aspect is preferably the working machine according to the ninth aspect, further comprising the following feature: In other words, in the working machine according to the tenth aspect, when the operating unit is in the laid-down posture, the bending portion bends relative to the base end so as to extend upward from the base end. In this tenth aspect, when the operating unit is in the laid-down posture, the bending portion bends upward relative to the base end, making it easier to operate the operating unit.

[0017] An eleventh aspect is preferably the work machine according to the second aspect, further comprising the following feature: That is, the work machine according to the eleventh aspect further comprises a cable holding part that holds a cable connected to the antenna main body, and the cable holding part rotates together with the antenna main body in conjunction with the rotation of the rotation support part. In this eleventh aspect, because the cable holding part rotates together with the antenna main body, the cable connected to the antenna main body can be held in a state that is less likely to damage it.

[0018] A twelfth aspect is preferably the work machine according to the second aspect, further comprising the following feature: In other words, in the work machine according to the twelfth aspect, the height changer further includes an antenna holder that detachably holds the antenna body, and the antenna holder rotates together with the antenna body in conjunction with rotation of the rotary support part. In this twelfth aspect, the antenna body can be held in a replaceable manner. [Effects of the Invention]

[0019] According to the present disclosure, a work machine is provided that can reduce the load on the antenna when changing the position of the antenna. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a left side view showing a work machine according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a front view of the work machine of FIG. 1 as seen from the front. [Figure 3]FIG. 2 is a perspective view of the work machine of FIG. 1 as viewed from above left. [Figure 4] FIG. 2 is a perspective view showing the overall structure of the antenna device in a usage position of the antenna main body. [Figure 5] FIG. 10 is another perspective view showing the overall structure of the antenna device in the use position of the antenna main body. [Figure 6] 5 is a view of the antenna device as seen from the direction of arrow A in FIG. 4. FIG. [Figure 7] 5 is a view of the antenna device as seen from the direction of arrow B in FIG. 4. FIG. [Figure 8] FIG. 2 is a perspective view showing the overall structure of the antenna device when the antenna main body is in a retracted position. [Figure 9] FIG. 10 is another perspective view showing the overall structure of the antenna device when the antenna main body is in the retracted position. [Figure 10] 9 is a view of the antenna device as seen from the direction of arrow C in FIG. 8. [Figure 11] 9 is a view of the antenna device as seen from the direction of arrow D in FIG. 8. FIG. [Figure 12] 10 is a view showing the erected portion of the mounting portion, the rotation support portion of the height changing portion, and the rotation support shaft when the antenna main body is in the use position, viewed from the vertical direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] [Embodiment Mode] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 is a left side view of a work machine 100 according to an embodiment of the present disclosure. FIG. 2 is a front view of the work machine 100 of FIG. 1 as viewed from the front. The work machine 100 includes a lower traveling body 1 including a traveling device, an upper rotating body 2 supported on the lower traveling body 1 so as to be rotatable relative to the lower traveling body 1 about a vertically extending rotation axis Z, and a work device 3 mounted on the upper rotating body 2 and operated by a rider or remotely. The work device 3 includes, for example, a boom, an arm, and a bucket. The work machine 100 according to this embodiment is a hydraulic excavator, but the work machine of the present disclosure is not limited to hydraulic excavators and may be other work machines such as a crane or a bulldozer. The travel device may be, for example, a crawler-type travel device or a travel device having tires.

[0022] The upper rotating body 2 includes a rotating frame 2a, a cab 11 supported by the rotating frame 2a, and a machinery room 12 located at the rear of the upper rotating body 2. The machinery room 12 houses an engine, a hydraulic circuit device, etc., and a counterweight is provided at the rear of the machinery room 12.

[0023] The cab 11 is mounted at the front of the revolving frame 2a on the left side in the left-right direction of the revolving frame 2a, and constitutes a driver's cab equipped with operating devices consisting of levers, pedals, etc. for maneuvering to operate the work machine 100. In other words, in response to operations performed by an operator inside the cab 11 via the operating devices, the work machine 100 performs operations such as traveling of the lower traveling body 1, rotation of the upper revolving body 2, and work operation of the work device 3.

[0024] FIG. 3 is a perspective view of the work machine 100 as seen from the upper left. As shown in FIG. 3, an antenna unit 20 is supported on the roof (upper part) of the cab 11, on the left end side. The work machine 100 operates in response to operations given to a remote control device (not shown) that is located in a position remote from the work machine 100. In other words, in response to operations via the remote control device by a remote operator located in a position remote from the work machine 100, the work machine 100 performs operations such as traveling of the undercarriage 1, rotation of the upper rotating body 2, and work operation of the work implement 3. The remote control device outputs an operation signal in response to the operation via the remote control device via a communication line. The antenna unit 20 is provided to receive the operation signal output from the remote control device. Note that the parts of the work machine 100 excluding the antenna unit 20 correspond to the work machine main body of the present invention.

[0025] [Antenna structure] The structure of the antenna device 20 will be described in detail below. Fig. 4 is a perspective view of the antenna device 20, Fig. 5 is a perspective view of the antenna device 20 viewed from a different direction than Fig. 4, Fig. 6 is a view of the antenna device 20 in Fig. 4 viewed from the direction of arrow A (i.e., the front of the work machine 100), and Fig. 7 is a view of the antenna device 20 in Fig. 4 viewed from the direction of arrow B (the left side of the work machine 100). Figs. 4 to 7 correspond to the usage position of the antenna main body 22 (and the upright position of the operation unit 28, which will be described later) that is used when remotely operating the work machine 100 using the antenna device 20. Also, Figs. 8 to 11 correspond to the storage position of the antenna main body 22 (and the laid-down position of the operation unit 28, which will be described later) that is used when transporting the work machine 100, etc. Fig. 8 is a perspective view of the antenna device 20 when the antenna main body 22 is in the stored position, Fig. 9 is another perspective view of the antenna device 20 when the antenna main body 22 is in the stored position, that is, a perspective view of the antenna device 20 in the stored position as viewed from a direction different from that of Fig. 8, Fig. 10 is a view of the antenna device 20 in Fig. 8 as viewed from the direction of arrow C, and Fig. 11 is a view of the antenna device 20 in Fig. 8 as viewed from the direction of arrow D. In Figs. 4 to 11, the X direction is a direction parallel to the fore-and-aft direction of the upper rotating body 2 of the work machine 100, the Y direction is a direction parallel to the left-and-right direction of the upper rotating body 2 of the work machine 100, and the Z direction is the vertical direction (up-down direction). The following description will be given assuming that the work machine 100 is on a flat road surface.

[0026] The antenna device 20 includes a mounting portion 24 supported on the roof (upper portion) of the cab 11, a height change portion 26 supported by the mounting portion 24, an antenna main body 22 supported by the height change portion 26, and an operating portion 28 that receives an operation to displace the height change portion 26 relative to the mounting portion 24 in order to change the height of the upper end portion of the antenna main body 22.

[0027] The antenna body 22 is a rod-like member formed in a longitudinal direction. The antenna body 22 is supported by a height changer 26 so as to be displaceable between a usage position (see FIGS. 4 to 7) in which the longitudinal direction of the antenna body 22 is aligned vertically, and a storage position (see FIGS. 8 to 11) in which the longitudinal direction of the antenna body 22 is aligned horizontally. One end of a cable 30 is connected to the lower vertical end of the antenna body 22 in the usage position. The other end of the cable 30 is connected to a processing device (not shown), and an operation signal output from a remote control device received by the antenna body 22 is transmitted to the processing device via the cable 30. The processing device executes control for operating the work machine 100 based on the transmitted operation signal.

[0028] The height changing section 26 includes a rotation support shaft 54, a rotation support section 52, an intermediate member 32, and an antenna holding section 36.

[0029] The antenna main body 22 is supported by the pivot support 52 via the intermediate member 32 and the antenna holder 36. The intermediate member 32 is a longitudinally extending member having, for example, a U-shaped cross section. In this case, the intermediate member 32 includes a first member 32a and a second member 32b arranged so that their respective surfaces face each other, and a connecting member 32c connecting the first member 32a and the second member 32b. The connecting member 32c is a flat plate-shaped member, and the first member 32a is a portion bent at one end of the connecting member 32c relative to the connecting member 32c, and the second member 32b is a portion bent at the other end of the connecting member 32c relative to the connecting member 32c. One longitudinal end of the intermediate member 32 is connected to the pivot support 52 by welding or the like. The intermediate member 32 is disposed along the left-right direction of the upper rotating body 2, and the other longitudinal end of the intermediate member 32 is located outside the left end of the cab 11 in the left-right direction. Furthermore, the antenna body 22 is attached to a portion between the center and the other end in the longitudinal direction of the intermediate member 32, and is disposed in a position where it does not overlap with the cab 11 (work machine body) in a top view of the work machine 100. In other words, the antenna body 22 is positioned outboard of the left end of the cab 11 in the left-right direction in a top view of the work machine 100. When the antenna body 22 is in the usage position, the face of the connecting member 32c is aligned vertically, the first member 32a extends rearward in the front-to-rear direction from one end of the connecting member 32c, and the second member 32b extends rearward in the front-to-rear direction from the other end of the connecting member 32c.

[0030] A hole (not shown) through which a bolt 38 passes for fixing the antenna holding part 36 to the connecting member 32c is provided in a portion of the connecting member 32c between the center and the other end in the longitudinal direction. The antenna holding part 36 includes a base 40 fixed to the intermediate member 32 by the bolt 38, a bent part 41 that bends at one end side of the base 40, and an arc part 42 that holds the antenna main body 22 at the other end side of the base 40. The base 40 has a hole (not shown) through which the bolt 38 passes. The bent part 41 extends from one end side of the base 40 toward the connecting member 32c. The arc part 42 is formed in an arc shape that follows the outer periphery of the antenna main body 22. Then, by passing a bolt 38 through the hole in the base 40 and the hole in the connecting member 32c and tightening the bolt 38, the bent portion 41 is pressed against and abuts the flat portion of the connecting member 32c, and the antenna body 22 is pressed against and abuts the connecting member 32c, thereby holding the antenna holding portion 36 to the connecting member 32c. In addition, by pressing the antenna body 22 against the connecting member 32c, the antenna body 22 is prevented from slipping off the arc portion 42 in either the use position or the storage position.

[0031] The antenna body 22 is formed with an annular flange portion 44 that protrudes radially outward, and the flange portion 44 abuts against the arc portion 42, preventing the antenna body 22 from falling off from the arc portion 42 when in use.

[0032] The mounting portion 24 is fixed to the roof of the cab 11 with bolts 50, and is disposed at a position overlapping the cab 11 when viewed from above the cab 11 of the work machine 100. The mounting portion 24 includes a base portion 46 and an upright portion 48 connected to the base portion 46.

[0033] The base 46 may be, for example, an L-shaped member. In this case, the base 46 includes a flat plate-like first member 46a that is disposed along the roof of the cab 11 and fixed to the cab 11 with two bolts 50, and a flat plate-like second member 46b that stands upward at the right end of the first member 46a in the left-right direction. The second member 46b may extend, for example, vertically upward from the first member 46a.

[0034] The standing portion 48 is a longitudinal member and is disposed so that its longitudinal direction is along the vertical direction. The standing portion 48 may have a U-shaped cross section when cut horizontally. In this case, the standing portion 48 includes a first member 48a and a second member 48b disposed to face each other, and a connecting member 48c connecting the first member 48a and the second member 48b.

[0035] The first member 48a and the second member 48b are flat plate-shaped members arranged parallel to each other with their respective surfaces facing each other. The first member 48a may be connected, for example, by welding, with its surface overlapping the left side of the surface of the second member 46b of the base portion 46. The second member 48b may have its lower end in the longitudinal direction connected to the first member 46a of the base portion 46 by welding, for example. The connecting member 48c is arranged perpendicular to the first member 48a and the second member 48b, and both ends in the left and right directions are connected to the first member 48a and the second member 48b, respectively. When the first member 48a and the second member 48b are connected to the second member 46b and the first member 46a, respectively, the upper ends of the first member 48a and the second member 48b are located higher than the upper end of the second member 46b.

[0036] The height adjusting unit 26 includes a rotation support shaft 54 attached to the mounting unit 24, and a rotation support unit 52 attached so as to be rotatable around the axis of the rotation support shaft 54. The antenna main body 22 is supported by the rotation support unit 52 via the intermediate member 32 and the antenna holding unit 36.

[0037] The pivot support portion 52 covers the vertical upper portion of the standing portion 48. The cross section of the pivot support portion 52 when cut on a horizontal plane may be, for example, U-shaped. In this case, the pivot support portion 52 includes a first member 52a and a second member 52b that are flat plate-like members and are arranged parallel to each other with their respective surfaces facing each other, and a connecting member 52c that is arranged perpendicular to the surfaces of the first member 52a and the second member 52b and has both ends connected to the first member 52a and the second member 52b. When the antenna body 22 is in the usage position, the upper ends of the second member 52b and the connecting member 52c are located higher than the upper ends of the first member 48a and the second member 48b, and the upper ends of the second member 52b and the connecting member 52c are located higher than the upper end of the first member 52a.

[0038] The rotation support shaft 54 is a shaft that penetrates through the first member 48a and the second member 48b of the standing portion 48 and the first member 52a and the second member 52b of the rotation support portion 52. Fig. 12 is a view of the standing portion 48 of the mounting portion 24, the rotation support portion 52 of the height adjusting portion 26, and the rotation support shaft 54 viewed vertically from above in the usage attitude of the antenna body 22. Note that the operation unit 28 is omitted from Fig. 12.

[0039] 12, the rotation support portion 52 is disposed outside the standing portion 48 and covers at least a portion of the standing portion 48. The rotation support portion 52 and the standing portion 48 are disposed so that their openings face the same direction. That is, the U-shaped openings of the standing portion 48 and the rotation support portion 52 are disposed nested one on top of the other with the U-shaped openings of the standing portion 48 and the U-shaped openings of the rotation support portion 52 facing the same direction.

[0040] A through-hole 60a is formed in the first member 48a of the standing portion 48, and a through-hole 60b is formed in the second member 48b. Furthermore, a through-hole 62a is formed in the first member 52a of the rotation support portion 52, and a through-hole 62b is formed in the second member 52b. These through-holes (60a, 60b, 62a, 62b) are arranged so that the centers of the holes are aligned in a straight line, and the rotation support shaft 54 passes through these through-holes (60a, 60b, 62a, 62b). As a result, the rotation support portion 52 is supported so that it can rotate around the axis of the rotation support shaft 54. Hereinafter, "around the axis" refers to "around the axis of the rotation support shaft 54," and "rotation" refers to rotation around the axis of the rotation support shaft 54. When the rotation support part 52 is rotated around the axis of the rotation support shaft 54 , the intermediate member 32 and the antenna holding part 36 connected to the rotation support part 52 also rotate integrally with the rotation support part 52 .

[0041] When the rotation support part 52 is rotated around the rotation support shaft 54 so that the antenna body 22 assumes the usage posture, the rotation support part 52 assumes a posture in which the connecting member 52c is located rearward in the front-to-rear direction relative to the standing part 48, as shown in Figures 4 and 5. That is, the rotation support part 52 assumes a posture in which the U-shaped opening is located forward in the front-to-rear direction. Furthermore, when viewed from above the work machine 100, the rotation support part 52 assumes a posture in which it appears U-shaped. The angle of the antenna body 22 is set so that in this state, the antenna body 22 assumes the usage posture in which the longitudinal direction of the antenna body 22 is aligned with the vertical direction. For example, in the usage posture of the antenna body 22, the longitudinal direction of the antenna body 22 may be set to be parallel or approximately parallel to the vertical direction.

[0042] Furthermore, when the rotation support part 52 is rotated about the rotation support shaft 54 so that the antenna body 22 assumes the storage position, the rotation support part 52 assumes a position in which the connecting member 52c is positioned above the standing part 48, as shown in FIGS. 8 to 10 . That is, when the antenna body 22 is in the storage position, the U-shaped opening of the rotation support part 52 assumes a position in which it is positioned at the bottom of the rotation support part 52. Furthermore, when the work machine 100 is viewed from the front, the rotation support part 52 assumes a position in which it appears U-shaped. The angle of the antenna body 22 is set so that in this state, the antenna body 22 assumes a storage position in which its longitudinal direction is aligned with the horizontal direction. For example, in the storage position of the antenna body 22, the longitudinal direction of the antenna body 22 may be set to be parallel or approximately parallel to the horizontal direction.

[0043] The rotation support shaft 54 is composed of a single rod-shaped member, and as shown in FIG. 12, a bolt head 64 is formed at one axial end of the rotation support shaft 54. A pair of nuts 66a, 66b are fastened to the other axial end of the rotation support shaft 54. Note that hereinafter, each of the nuts 66a, 66b may be referred to as a nut 66. A washer 68a is interposed between the head 64 of the rotation support shaft 54 and the second member 52b of the rotation support part 52. A washer 68b is interposed between the second member 52b of the rotation support part 52 and the second member 48b of the standing part 48. A washer 68c is interposed between the first member 48a of the standing part 48 and the first member 52a of the rotation support part 52. A washer 68d and four disc springs 70a to 70d are interposed between the first member 52a of the rotation support part 52 and the nut 66a. In the following description, each of the disc springs 70a to 70b may be referred to as disc spring 70.

[0044] The antenna device 20 further includes a rotation limiting mechanism 72. The rotation limiting mechanism 72 includes the above-mentioned disc springs 70a to 70d and washers 68a to 68d. The rotation limiting mechanism 72 limits the rotation of the rotation support part 52 around the axis of the rotation support shaft 54.

[0045] Each disc spring 70 has a conical shape with a hole in the center, through which the rotation support shaft 54 passes. Disc springs 70a and 70b are arranged to face each other. Disc springs 70c and 70d are also arranged to face each other.

[0046] When the pair of nuts 66 are tightened, the four disc springs 70 interposed between the nut 66a and the washer 68d are compressed in the axial direction of the rotation support shaft 54, causing the conical shape of each of the four disc springs 70 to flatten, and at the same time, a thrust force acting in the axial direction is generated as a restoring force that attempts to restore each of the disc springs 70a to 70b to its original shape. This thrust force generates frictional forces between the first member 52a of the rotation support portion 52 and the washer 68c, between the first member 52a and the washer 68d, between the first member 48a of the standing portion 48 and the washer 68c, between the second member 48b of the standing portion 48 and the washer 68b, between the second member 52b of the rotation support portion 52 and the washer 68a, and between the second member 52b and the washer 68b. The frictional force limits the rotation of the rotation support part 52 around the rotation support shaft 54. In other words, because the pair of nuts 66 are in a tightened state, the rotation support part 52 does not rotate around the axis of the rotation support shaft 54 unless a rotational force for rotating the rotation support part 52 around the axis of the rotation support shaft 54 acts on the rotation support part 52, and therefore the rotation support part 52 is essentially in a non-rotating state. Furthermore, when the rotational force acting on the rotation support part 52 exceeds the force limiting the rotation of the rotation support part 52, the rotation support part 52 rotates around the axis of the rotation support shaft 54.

[0047] The operating unit 28 is a rod-like member formed in a longitudinal direction. The operating unit 28 is attached to the rotation support part 52, and when the antenna body 22 is in the usage position, the operating unit 28 is in an upright position with its longitudinal direction aligned vertically, and when the antenna body 22 is in the storage position, the operating unit 28 is in a laid-down position with its longitudinal direction aligned horizontally.

[0048] The operating portion 28 includes a base end portion 28a attached to the pivot support portion 52, a bent portion 28b extending from the base end portion 28a so as to be bent relative to the base end portion 28a, and a handle portion 28c attached to the tip of the bent portion 28b.

[0049] When the operating unit 28 is in an upright position, the longitudinal direction of the base end 28a extends along the vertical direction. When the operating unit 28 is in a laid-down position, the longitudinal direction of the base end 28a extends along the horizontal direction. For example, when the operating unit 28 is in an upright position, the longitudinal direction of the base end 28a may be arranged parallel or approximately parallel to the vertical direction, and when the operating unit 28 is in a laid-down position, the longitudinal direction of the base end 28a may be arranged parallel or approximately parallel to the horizontal direction. The base end 28a is connected to at least one of the second member 52b and the connecting member 52c of the rotation support unit 52 by welding or the like. In this case, the base end 28a may be connected to both the second member 52b and the connecting member 52c. For example, the left side of the base end 28a is connected to the right surface of the second member 52b, and the rear side of the base end 28a is connected to the front surface in the front-to-rear direction of the connecting member 52c, so that the operating unit 28 is stably connected to the rotation support unit 52. Furthermore, as shown in Figure 7, the base end 28a is hidden by the antenna main body 22 when viewed from the left side in the left-right direction of the working machine 100. In this embodiment, the base end 28a and the antenna main body 22 are parallel or approximately parallel to each other, and are positioned so as to overlap each other when viewed in the left-to-right direction.

[0050] The bent portion 28b extends from the end of the base end portion 28a. The bent portion 28b is bent relative to the base end portion 28a. Specifically, the center line C1 of the base end portion 28a is bent at an angle θ with respect to the center line C2 of the bent portion 28b. The angle θ may be, for example, an acute angle. In relation to this, when the operation unit 28 is in an upright position, the bent portion 28b is inclined rearward in the fore-and-aft direction of the upper rotating body 2 with respect to the base end portion 28a (or the antenna main body 22). Furthermore, when the operation unit 28 is in a laid-down position, the bent portion 28b is bent relative to the base end portion 28a so as to extend obliquely upward from the base end portion 28a.

[0051] The handle portion 28c is formed in a cylindrical shape and is attached to the end of the bent portion 28b. The outer diameter of the handle portion 28c is larger than the outer diameter of the bent portion 28b. The handle portion 28c is a portion that is grasped by an operator operating the operation unit 28, and the operator can grasp the handle portion 28c to rotate the operation unit 28 around the axis of the rotation support shaft 54. When the operation unit 28 is rotated around the axis of the rotation support shaft 54, a rotation force for rotating the rotation support portion 52 around the axis of the rotation support shaft 54 acts on the rotation support portion 52, so that the rotation support portion 52 is rotated around the axis of the rotation support shaft 54, and the height of the upper end of the antenna main body 22 is changed in accordance with the rotation of the rotation support portion 52. In this way, the height of the upper end of the antenna main body 22 is changed by operating the operation unit 28 by the operator.

[0052] 6, the operating unit 28 is disposed such that, when viewed in the radial direction of the rotation support shaft 54 and in a direction perpendicular to the center line C1 of the operating unit 28, the center line C1 of the operating unit 28 is located between one end 55a and the other end 55b of the rotation support unit 52 in the axial direction of the rotation support shaft 54, among the portions supported by the rotation support shaft 54. Note that in this embodiment, the one end 55a of the rotation support unit 52 corresponds to the portion of the first member 52a supported by the rotation support shaft 54, and the other end 55b of the rotation support unit 52 corresponds to the portion of the second member 52b supported by the rotation support shaft 54.

[0053] An L-shaped member 35, which is made of a substantially L-shaped flat plate, is connected to the other longitudinal end of the intermediate member 32 by welding or the like. In this case, the L-shaped member 35 is arranged so that its surface is parallel to the first member 52a and the second member 52b. When the antenna main body 22 is in the usage position, the L-shaped member 35 includes a first member 35a extending downward from the other end of the intermediate member 32 and a second member 35b extending in the front-rear direction from the lower end of the first member 35a. A bent portion 35c that bends toward the antenna main body 22 is formed on the front side of the second member 35b. A first cable holder 74 that holds the cable 30 is fixed to the bent portion 35c with a bolt 75. The first cable holder 74 has a cylindrical portion through which the cable 30 is passed. The cylindrical portion is arranged along the longitudinal direction of the antenna main body 22. As a result, the cable 30 is held by the first cable holder 74 along the longitudinal direction of the antenna main body 22. Furthermore, even if the antenna main body 22 rotates, the first cable holding part 74 rotates integrally with the antenna main body 22, thereby reducing the load on the cable 30 and reducing the risk of pain around the part of the cable 30 connected to the antenna main body 22. The first cable holding part 74 is an example of a cable holding part of the present invention.

[0054] The cable 30 is held by the antenna device 20 not only by the first cable holding portion 74 but also by a second cable holding portion 76, a third cable holding portion 78, and a fourth cable holding portion 80.

[0055] The second cable holding portion 76 (see FIG. 10) is provided on the right surface of the second member 35b, and has a ring through which the cable 30 passes. The second cable holding portion 76 is an example of the cable holding portion of the present invention.

[0056] The third cable holding portion 78 (see FIGS. 8 to 11) is provided on the rear surface of the connecting member 32c in the front-rear direction, and has a ring through which the cable 30 passes. By passing the cable 30 through the ring, the cable 30 is held along the longitudinal direction of the intermediate member 32 (the axial direction of the rotation support shaft 54).

[0057] The fourth cable holding part 80 is provided at the tip of a protruding part 48d provided on the right side of the standing part 48, and has a circular ring through which the cable 30 passes. The protruding part 48d is a part that protrudes rightward from the right surface of the standing part 48.

[0058] The cable 30 is held so as to be movable relative to the first cable holding part 74 to the fourth cable holding part 80. If the cable 30 is pulled while the antenna main body 22 is rotating, the cable 30 moves relative to the first cable holding part 74 to the fourth cable holding part 80, thereby stretching the slack portion of the cable 30 and not interfering with the rotation of the antenna main body 22. Furthermore, the portion of the cable 30 where the pulling force no longer acts while the antenna main body 22 is rotating becomes the slack portion. The length of the cable 30 between each cable holding part is adjusted so that the slack portion is formed as an excess length, to an extent that does not interfere with the rotation of the antenna main body 22.

[0059] [Operation, effects, etc.] The operation of the antenna device 20 configured as described above will now be described. The antenna device 20 is disposed on the roof of the cab 11 where there are few obstructions in order to ensure communication performance. The antenna device 20 is configured to be switchable between a usage posture of the antenna main body 22 and a storage posture of the antenna main body 22. In the usage posture of the antenna main body 22, the longitudinal direction of the antenna main body 22 is disposed along the vertical direction, and the upper end of the antenna main body 22 is positioned higher than the roof of the cab 11, thereby ensuring communication performance of the antenna main body 22 and enabling it to transmit and receive radio waves appropriately. In the storage posture of the antenna main body 22, the longitudinal direction of the antenna main body 22 is disposed along the horizontal direction, and when the work machine 100 is loaded onto a trailer or the like and transported, the height of the upper end of the antenna main body 22 is lower than in the usage posture, thereby satisfying height restrictions during transportation.

[0060] The antenna body 22 is switched between the use position and the storage position by an operator operating the operation unit 28 to displace the height change unit 26. For example, the operator operates the operation unit 28, which is in the lying down position, to rotate the operation unit 28 around the rotation support shaft 54 toward the rear side of the work machine 100 until the operation unit 28 assumes an upright position. At this time, the antenna body 22 rotates around the rotation support shaft 54 in conjunction with the operation unit 28, thereby switching the antenna body 22 to the use position along the vertical direction. Furthermore, the operation unit 28, which is in the upright position, is rotated around the rotation support shaft 54 toward the front side of the work machine 100 until the operation unit 28 assumes a lying down position. At this time, the antenna body 22 rotates around the rotation support shaft 54 in conjunction with the operation unit 28, thereby switching the antenna body 22 to a storage position along the horizontal direction. In this way, the worker can change the height of the upper end of the antenna body 22 using the operating unit 28, so that the worker does not have to directly grab the antenna body 22 when changing the height of the upper end of the antenna body 22, thereby reducing the load on the antenna body 22.

[0061] Furthermore, when operation unit 28 is not being operated, rotation of rotation support unit 52 is limited by rotation limiting mechanism 72, preventing unintended rotation of rotation support unit 52 and antenna main body 22. The elastic modulus of disc springs 70, the number of disc springs 70, etc. are appropriately adjusted so that rotation support unit 52 will not rotate unless operation unit 28 is operated by an operator.

[0062] On the other hand, when an operator operates operating unit 28 and applies to operating unit 28 a rotational force that exceeds the force of rotation-limiting mechanism 72 limiting the rotation of rotation support unit 52, operating unit 28 is rotated against rotation-limiting mechanism 72. In conjunction with this, rotation support unit 52 and antenna main body 22 are rotated, and antenna main body 22 is displaced between the use position and the storage position. Note that the longitudinal dimensions of base end portion 28a and bent portion 28b of operating unit 28 are adjusted so that operating unit 28 can be rotated with a normal force by the operator.

[0063] Furthermore, when viewed from above the cab 11 of the work machine 100, the antenna main body 22 is positioned so as not to overlap with the cab 11, so that the antenna main body 22 can be positioned away from the cab 11 to the left, i.e., in a position with fewer obstructions, making it easier to send and receive radio waves.

[0064] Furthermore, when the rotation support shaft 54 is viewed radially and in a direction perpendicular to the center line C1 of the operating unit 28, the portion supported by the rotation support shaft 54 is arranged so that the center line C1 of the operating unit 28 is located between one end 55a and the other end 55b of the rotation support unit 52 in the axial direction of the rotation support shaft 54.Therefore, compared to when the center line C1 of the operating unit 28 is not located between the one end 55a and the other end 55b, twisting is less likely to occur when the operating unit 28 is operated, making it easier to operate the operating unit 28.

[0065] Furthermore, when the antenna body 22 is in the usage position, the longitudinal direction of the operation unit 28 is in an upright position along the vertical direction, and when the antenna body 22 is in the storage position, the longitudinal direction of the operation unit 28 is in a laid-down position along the horizontal direction, so that the antenna body 22 and the operation unit 28 are in the same position. As a result, it is easier to operate the operation unit 28 compared to when the antenna body 22 and the operation unit 28 are arranged in different positions.

[0066] Furthermore, bending portion 28b constituting operation unit 28 is bent relative to base end portion 28a, thereby preventing bending portion 28b from overlapping with antenna main body 22 and making it difficult to see. Furthermore, when operation unit 28 is in the laid-down position, bending portion 28b is bent upward relative to base end portion 28a, making it easier for an operator to grasp handle portion 28c of operation unit 28 when switching antenna main body 22 from the stored position to the usage position.

[0067] Furthermore, since the first cable holding portion 74 rotates integrally with the antenna main body 22 in conjunction with the rotation of the pivotal support portion 52, the load on the cable 30 during the rotation of the pivotal support portion 52 is reduced, making the cable 30 less likely to be damaged.

[0068] Furthermore, the antenna holding part 36, which detachably holds the antenna body 22, rotates together with the antenna body 22 in conjunction with the rotation of the rotation support part 52, and therefore does not interfere with the rotation of the antenna body 22. Furthermore, if the antenna body 22 is damaged, the antenna holding part 36 can be removed and the antenna body 22 can be easily replaced.

[0069] [Variations] In the above embodiment, the antenna body 22 is arranged such that its longitudinal direction is parallel to the vertical direction in the use position and parallel to the horizontal direction in the storage position, but this is not necessarily limited to this. That is, when the antenna body 22 is in the use position, it is sufficient that the antenna body 22 is arranged along a substantially vertical direction. Similarly, when the antenna body 22 is in the storage position, it is sufficient that the antenna body 22 is arranged along a substantially horizontal direction.

[0070] In the above embodiment, the longitudinal direction of the base end 28a of the operating unit 28 is arranged parallel to the vertical direction when the antenna main body 22 is in the usage position, and is arranged parallel to the horizontal direction when the antenna main body 22 is in the storage position, but this is not necessarily limited to this. That is, it is sufficient that the longitudinal direction of the base end 28a is arranged along the approximately vertical direction when the operating unit 28 is in the upright position, and that the longitudinal direction of the base end 28a is arranged along the approximately horizontal direction when the operating unit 28 is in the laid-down position.

[0071] In the above embodiment, a pair of nuts 66a, 66b are fastened to the other axial end of the rotation support shaft 54, but the number of nuts 66 is not limited to this. For example, one nut may be fastened, or three or more nuts may be fastened.

[0072] In the above embodiment, four disc springs 70a to 70d are interposed between the nut 66a and the washer 68d, but the number of disc springs 70 is not limited to this. For example, one to three disc springs 70 may be interposed, or five or more disc springs 70 may be interposed. In short, the number of disc springs 70 can be freely changed within a range that can generate a thrust force that can prevent unintended rotation of the rotation support part 52.

[0073] In the above embodiment, the rotation support part 52 is supported rotatably around the axis of one rotation support shaft 54, but the rotation support part 52 may be rotatably supported by a plurality of rotation support shafts 54. For example, an additional rotation support shaft 54 may be provided for the rotation support part 52 that is supported rotatably around the axis of the rotation support shaft 54, and the additional rotation support part 52 may be rotatably supported by the additional rotation support shaft 54, and an intermediate member 32 that supports the antenna main body 22 and an antenna holding part 36 may be provided on the additional rotation support part 52.

[0074] In the above embodiment, the antenna device 20 is provided on the left side of the cab 11, but this is not necessarily limited to this. For example, the antenna device 20 may be provided on the right side of the cab 11. Furthermore, the antenna device 20 is not necessarily limited to being disposed on the roof of the cab 11. In short, it is sufficient that the antenna device 20 can be attached to any location on the upper part of the work machine 100, and it may be provided on the machine room 12, for example.

[0075] In the above embodiment, the operating portion 28 is connected so that the base end portion 28a and the bent portion 28b are bent, but it does not necessarily have to be formed so as to be bent, and it may be formed in a straight rod shape. [Explanation of symbols]

[0076] 20: Antenna device 22: Antenna body 24: Mounting part 26: Height change section 28:Operation unit 28a: Proximal end 28b: Bent part 36: Antenna holder 52: Rotation support part 54: Rotating support shaft 55a: One end 55b: Other end 72: Rotation limiting mechanism 74: First cable holding part (cable holding part) 76: Second cable holding part (cable holding part) 100:Work machinery

Claims

1. A work machine body; an antenna device supported on an upper portion of the work machine body, The antenna device includes: a mounting portion supported on the work machine body; a height changing portion supported by the mounting portion; an antenna body supported by the height changing section; an operating unit that receives an operation to displace the height change unit relative to the mounting unit in order to change the height of the upper end of the antenna body.

2. the height changing unit includes a rotation support shaft attached to the mounting unit, and a rotation support unit attached to be rotatable around the axis of the rotation support shaft, The work machine according to claim 1 , wherein the antenna body and the operation unit are attached to the rotation support unit.

3. The antenna body is formed in an elongated shape, 3. The work machine according to claim 2, wherein the antenna body is supported by the rotary support part so as to be displaceable between a usage position in which the longitudinal direction of the antenna body is arranged along a vertical direction and a storage position in which the longitudinal direction of the antenna body is arranged along a horizontal direction.

4. The work machine according to claim 2 , wherein the antenna device further comprises a rotation limiting mechanism that limits rotation of the rotation support portion about the axis of the rotation support shaft.

5. the mounting portion is disposed at a position overlapping the work machine body in a top view of the work machine body, The work machine according to claim 1 , wherein the antenna body is disposed in a position where at least a portion of the antenna body does not overlap with the work machine body in the top view.

6. 3. The work machine according to claim 2, wherein the operating unit is arranged such that, when viewed in a radial direction of the rotation support shaft and in a direction perpendicular to a center line of the operating unit, the center line falls between one end and the other end of the rotation support unit in the axial direction of the rotation support shaft, of a portion supported by the rotation support shaft.

7. The operating portion is formed in a longitudinal shape, The operation unit includes: When the antenna body is in the use position, the antenna body is in an upright position with its longitudinal direction aligned vertically, The work machine according to claim 3 , wherein when the antenna body is in the stored position, the antenna body is in a lying position with its longitudinal direction aligned horizontally.

8. The work machine according to claim 7 , wherein the operating portion includes a base end portion attached to the rotation support portion, and a bent portion extending from the base end portion so as to be bent relative to the base end portion.

9. The work machine according to claim 8 , wherein the base end portion has a shape that extends horizontally when the operation unit is in the lying-down position, and that extends vertically when the operation unit is in the standing position.

10. The work machine according to claim 9 , wherein the bending portion bends relative to the base end portion so as to extend upward from the base end portion when the operation portion is in the laid-down position.

11. a cable holder for holding a cable connected to the antenna body; The work machine according to claim 2 , wherein the cable holding portion rotates together with the antenna body in conjunction with rotation of the rotation support portion.

12. the height changing unit further includes an antenna holding unit that detachably holds the antenna main body, The work machine according to claim 2 , wherein the antenna holder rotates together with the antenna body in conjunction with rotation of the rotation support part.

Images