Work machine

Abstract

To provide a construction machine that prevents a position of a driver's seat from becoming high.SOLUTION: A construction machine 100 comprises a lower traveling body 200, an upper revolving body 300, a slip ring 420, a first electric wire 256, and a second electric wire 340. The upper revolving body 300 is arranged above the lower traveling body 200. The slip ring 420 includes a stator 424 and a rotor 422 that are electrically connected. The slip ring 420 is arranged on the lower traveling body 200. The first electric wire 256 is arranged on the lower traveling body 200. The first electric wire 256 is electrically connected to the stator 424. The second electric wire 340 extends from the upper revolving body 300 to the rotor 422 and is electrically connected to the rotor 422. The rotor 422 is rotatable relative to the stator 424. The rotor 422 rotates as the upper revolving body 300 turns. A portion of the slip ring 420 protrudes downward from a lower surface 221a of the lower traveling body 200.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to construction machinery.

Background Art

[0002] Construction machinery including a self - propelled lower traveling body and an upper slewing body that can slew with respect to the lower traveling body is known. For example, Patent Document 1 discloses a wheel loader including a self - propelled traveling body and a slewing body that can slew with respect to the traveling body.

[0003] The wheel loader of Patent Document 1 further includes a swivel joint that enables the supply of pressure oil from the slewing body side to the traveling body side. The swivel joint has a housing fixed to the traveling body and a spindle accommodated in the housing that rotates as the slewing body slews. A rotation restricting member is attached to the upper part (the end on the slewing body side) of the spindle. A stopper for restricting the rotation of the rotation restricting member is provided on the slewing body. By the stopper restricting the rotation of the rotation restricting member, the spindle rotates as the slewing body slews.

[0004] The wheel loader of Patent Document 1 further includes a slip ring. The slip ring is fixed to a rotation restricting member attached to the spindle of the swivel joint. The upper part of the spindle constitutes the upper part of the swivel joint. Therefore, the slip ring is fixed to the upper part (the end on the slewing body side) of the swivel joint.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in a configuration where the slip ring is fixed to the upper part of the swivel joint (the end on the slewing body side), the driver's seat becomes higher by the height of the slip ring. As a result, the position of the center of gravity of the construction machine becomes higher, and the stability of the construction machine may decrease. In addition, when the stability of the construction machine decreases, the riding comfort also decreases. Furthermore, since the driver's seat becomes higher, it may be difficult for the operator to get on the driver's seat.

[0007] The present invention has been made in view of the above problems, and an object thereof is to provide a construction machine capable of suppressing an increase in the height of the driver's seat.

Means for Solving the Problems

[0008] According to one aspect of the present invention, a construction machine includes a lower traveling body, an upper slewing body, a slip ring, a first electric wire, and a second electric wire. The lower traveling body is capable of traveling. The upper slewing body is disposed above the lower traveling body. The upper slewing body is rotatable with respect to the lower traveling body. The slip ring has a stator and a rotor that are electrically connected. The slip ring is disposed on the lower traveling body. The first electric wire is disposed on the lower traveling body. The first electric wire is electrically connected to the stator. The second electric wire extends from the upper slewing body to the rotor and is electrically connected to the rotor. The rotor is rotatable with respect to the stator. The rotor rotates together with the rotation of the upper slewing body. A part of the slip ring protrudes downward from the lower surface of the lower traveling body.

Effects of the Invention

[0009] According to the construction machine according to the present invention, an increase in the height of the driver's seat can be suppressed.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the construction machine according to the present invention will be described with reference to the drawings (FIGS. 1(a) to 15). However, the present invention is not limited to the following embodiments, and can be implemented in various aspects without departing from the gist thereof. Note that, in cases where the description is repetitive, the description may be omitted as appropriate. Also, in the drawings, the same or corresponding parts are denoted by the same reference numerals and the description will not be repeated.

[0012] In this specification, for ease of understanding, the X-axis, Y-axis, and Z-axis that are orthogonal to each other may be described. Typically, the X-axis indicates the traveling direction of the lower traveling body 200 (FIG. 1(a)), and the Z-axis indicates the vertical direction. The Y-axis indicates a direction orthogonal to the traveling direction and the vertical direction of the lower traveling body 200. However, the X-axis, Y-axis, and Z-axis are not limited to these directions.

[0013] Furthermore, in this specification, for ease of understanding, "front", "rear", "upper", "lower", "left", and "right" may be described as appropriate. In the present embodiment, the side where the earth discharging device 230 (FIG. 1(b)) is disposed with respect to the lower traveling body 200 (FIG. 1(b)) is the "front side", and the opposite side is the "rear side". Also, the side where the upper swing body 300 (FIG. 1(a)) is disposed with respect to the lower traveling body 200 (FIG. 1(a)) is the "upper side", and the opposite side is the "lower side". Also, the side where the crawler traveling unit 212a (FIG. 1(a)) is disposed with respect to the crawler traveling unit 212b (FIG. 1(a)) is the "left side", and the opposite side is the "right side". That is, the left side when viewed from the rear side to the front side is the "left side", and the right side when viewed from the rear side to the front side is the "right side". However, "front", "rear", "upper", "lower", "left", and "right" are defined only for convenience of description, and there is no intention to limit the orientation of the construction machine of the present invention during use and assembly by these definitions of directions.

[0014] First, referring to FIGS. 1(a) and 1(b), the construction machine 100 of the present embodiment will be described. Here, as an example of the construction machine 100, a hydraulic excavator will be described. However, the construction machine 100 is not limited to a hydraulic excavator and may be an electric excavator. Alternatively, the construction machine 100 may be other construction machines.

[0015] FIG. 1(a) is a perspective view showing the construction machine 100 of the present embodiment. FIG. 1(b) is a perspective view showing the lower traveling body 200 and the rotary coupling member 400 included in the construction machine 100 of the present embodiment.

[0016] As shown in FIGS. 1(a) and 1(b), the construction machine 100 includes a lower traveling body 200, an earth discharging device 230, an upper swing body 300, a working machine 330, and a rotary coupling member 400. The lower traveling body 200 is self-propelled. That is, the lower traveling body 200 is capable of traveling. The upper swing body 300 is disposed above the lower traveling body 200. The upper swing body 300 is swingable with respect to the lower traveling body 200.

[0017] As shown in FIGS. 1(a) and 1(b), the lower traveling body 200 includes a pair of left and right crawler-type traveling units 212a, 212b and a truck frame 220. By driving the crawler-type traveling units 212a, 212b, the lower traveling body 200 moves forward or backward. As a result, the construction machine 100 moves forward or backward. The truck frame 220 supports the crawler-type traveling units 212a, 212b and the rotary coupling member 400. Specifically, the crawler-type traveling units 212a, 212b and the rotary coupling member 400 are attached to the truck frame 220. Therefore, the rotary coupling member 400 is disposed on the lower traveling body 200.

[0018] Specifically, the track frame 220 has a center frame 222 and a pair of left and right side frames 224a and 224b. The center frame 222 is located at the center of the track frame 220 in the Y-axis direction (left and right direction). The side frames 224a and 224b are respectively arranged on the sides of the center frame 222 in the Y-axis direction (left and right direction). That is, the center frame 222 is located between the side frames 224a and 224b. The side frames 224a and 224b are connected to the center frame 222.

[0019] The crawler traveling units 212a and 212b are attached to the side frames 224a and 224b. Therefore, the center frame 222 is arranged between the crawler traveling unit 212a and the crawler traveling unit 212b. The rotary coupling member 400 is attached to the center frame 222. Specifically, the rotary coupling member 400 is arranged at the center of the center frame 222 in the Y-axis direction (left and right direction).

[0020] The earth discharging device 230 is provided in front of the lower traveling body 200. The earth discharging device 230 is connected to the lower traveling body 200. The earth discharging device 230 is used for earth discharging operations such as discharging earth and sand, and leveling operations for construction sites and roads.

[0021] As shown in FIG. 1(b), the earth discharging device 230 has an earth discharging plate 232 extending in the Y-axis direction (left and right direction). The earth discharging plate 232 is grounded on the ground during the earth discharging operation. As the construction machine 100 moves forward, the earth discharging plate 232 discharges earth and sand. Similarly, the earth discharging plate 232 is grounded on the ground during the leveling operation. As the construction machine 100 moves forward, the earth discharging plate 232 levels the ground.

[0022] As shown in FIG. 1(a), the upper swing body 300 includes a control unit 310 and a controller 320. The control unit 310 is disposed above the rotary coupling member 400 (FIG. 1(b)). A driver's seat is arranged in the control unit 310. An operation lever, a travel lever, an operation panel, etc. are arranged on the driver's seat. The operator can control the travel of the construction machine 100 or the operation of the working machine 330 by sitting on the driver's seat and operating the operation lever or the like.

[0023] Furthermore, the dump plate 232 is operable, and the operator can operate the dump plate 232 by operating the work operation lever. Specifically, the dump plate 232 can perform a lift operation, a tilt operation, and an angle operation. The dump plate 232 is driven by the expansion and contraction of various hydraulic cylinders provided in the dumping device 230.

[0024] The lift operation is an operation in which the dump plate 232 moves in the vertical direction. The tilt operation is an operation in which the dump plate 232 rotates left and right about a rotation axis parallel to the X-axis direction (front-rear direction). The angle operation is an operation in which the dump plate 232 rotates left and right about a rotation axis parallel to the Z-axis direction (vertical direction). By the lift operation, the vertical position of the dump plate 232 changes. By the tilt operation, the angle of the dump plate 232 with respect to the ground changes. By the angle operation, the angle of the dump plate 232 with respect to the traveling direction changes. Therefore, the posture of the dump plate 232 changes by the tilt operation and the angle operation.

[0025] As shown in FIG. 1(a), the controller 320 is disposed at the rear of the control unit 310. The controller 320 controls each member of the construction machine 100.

[0026] Subsequently, referring to FIG. 1(a), the working machine 330 will be described. As shown in FIG. 1(a), the working machine 330 is connected to the upper swing body 300. The working machine 330 is disposed in front of the control unit 310. The working machine 330 includes a boom 332, a boom cylinder 332a, an arm 334, an arm cylinder 334a, a bucket 336, and a bucket cylinder 336a.

[0027] The boom cylinder 332a, the arm cylinder 334a, and the bucket cylinder 336a are movably extendable. The boom cylinder 332a, the arm cylinder 334a, and the bucket cylinder 336a are hydraulic cylinders. The boom 332, the arm 334, and the bucket 336 can be independently driven by the boom cylinder 332a, the arm cylinder 334a, and the bucket cylinder 336a. By driving the boom 332, the arm 334, and the bucket 336, excavation work such as earth and sand can be performed.

[0028] Specifically, the base end portion of the boom 332 is rotatably supported by a first rotation shaft provided at the front portion of the upper swing body 300. The first rotation shaft extends in the lateral direction (Y-axis direction). The boom 332 rotates about the first rotation shaft as the boom cylinder 332a extends and contracts.

[0029] The base end portion of the arm 334 is rotatably supported by a second rotation shaft provided at the tip end portion of the boom 332. The second rotation shaft extends in the lateral direction (Y-axis direction). The arm 334 rotates about the second rotation shaft as the arm cylinder 334a extends and contracts.

[0030] The bucket 336 is rotatably supported by a third rotation shaft provided at the tip end portion of the arm 334. The third rotation shaft extends in the lateral direction (Y-axis direction). The bucket 336 rotates about the third rotation shaft as the bucket cylinder 336a extends and contracts.

[0031] In addition to the control unit 310 and the controller 320, a slewing motor for slewing the upper slewing body 300, a plurality of hydraulic pumps, motors for driving the plurality of hydraulic pumps, etc. are arranged on the upper slewing body 300. The plurality of hydraulic pumps supply hydraulic pressure to each hydraulic actuator (boom cylinder 332a, arm cylinder 334a, bucket cylinder 336a, various hydraulic cylinders of the earth discharging device 230, and slewing motor, etc.). The rotary connecting member 400 shown in Fig. 1(b) is used as an oil passage between the upper slewing body 300 and the lower traveling body 200.

[0032] Furthermore, a power feeder is arranged on the upper slewing body 300. The upper slewing body 300 is provided with a power supply port (not shown), and by connecting a power supply cable of a commercial power supply (corresponding to an external power supply) to this power supply port, the commercial power supply and the power feeder are electrically connected. Note that the power feeder may be arranged on the lower traveling body 200.

[0033] Subsequently, referring to Fig. 1(b), the construction machine 100 of the present embodiment will be further described. As shown in Fig. 1(b), the construction machine 100 further includes a target prism 242 and an angle sensor 244. The target prism 242 and the angle sensor 244 are provided on the earth discharging device 230. The angle sensor 244 is an example of a "sensor".

[0034] In the present embodiment, the controller 320 shown in Fig. 1(a) has an earth discharging plate control mode which is a mode of controlling the earth discharging plate 232 based on three-dimensional data of the ground of the work target. The target prism 242 is used to detect the current position (three-dimensional coordinates) of the earth discharging plate 232. The angle sensor 244 detects the tilt angle of the earth discharging plate 232. The three-dimensional data is input to the controller 320 via an operation panel arranged on the operator's seat. The controller 320 controls the vertical position of the earth discharging plate 232 and the posture, that is, the angle (tilt angle) of the earth discharging plate 232 based on the current position (three-dimensional coordinates) of the earth discharging plate 232, the tilt angle of the earth discharging plate 232, and the three-dimensional data.

[0035] Specifically, the spoil discharging device 230 further has a support column 241 extending in the vertical direction. The support column 241 is located on the back side of the spoil discharging plate 232 and is connected to the spoil discharging plate 232. Specifically, the support column 241 stands on a stay mounted on the back surface of the spoil discharging plate 232. The target prism 242 is disposed at the upper part of the support column 241. The target prism 242 has a 360° prism (omnidirectional prism) and can reflect light in a direction parallel to the incident light regardless of the direction from which the light is incident. Note that the target prism 242 is detachably mounted on the support column 241.

[0036] The target prism 242 is automatically tracked by a total station (distance and angle measuring device) installed at an appropriate position at or near the work site. Specifically, the total station has a known electronic distance and angle measuring device using light, and acquires (calculates) the coordinate information (three-dimensional coordinates) of the target prism 242 in real time while tracking the target prism 242. Specifically, the total station measures the distance from the total station to the target prism 242 and the angles of the target prism 242 with respect to the vertical direction and the horizontal direction based on the reflected light from the target prism 242. Then, the coordinate information (three-dimensional coordinates) of the target prism 242 is acquired (calculated) from the measured data.

[0037] The construction machine 100 further includes a wireless communication device for performing wireless communication with the total station. For example, the wireless communication device is attached to a bracket erected behind the operation unit 310. The coordinate information (three-dimensional coordinates) of the target prism 242 is transmitted from the total station to the construction machine 100 by wireless communication and input to the controller 320. Therefore, the controller 320 receives the coordinate information (three-dimensional coordinates) of the target prism 242 from the total station in real time. Then, based on the coordinate information of the target prism 242, the current position (three-dimensional coordinates) of the spoil discharging plate 232 is acquired (calculated).

[0038] The angle sensor 244 is installed on the back side of the dumping plate 232. The angle sensor 244 transmits a signal indicating the current posture (i.e., the angle (tilt angle)) of the dumping plate 232 to the controller 320. As a result, information indicating the current posture (i.e., the angle (tilt angle)) of the dumping plate 232 is input to the controller 320.

[0039] The dumping plate control mode can be used, for example, for leveling work. The construction machine 100 (controller 320) controls the operation of the dumping plate 232 based on the current position (3D coordinates) of the dumping plate 232, the current posture (tilt angle) of the dumping plate 232, and the 3D data of the ground of the work target to perform automatic leveling work. Specifically, the operation of the dumping plate 232 is controlled according to the 3D data of the ground of the work target. As a result, the height and tilt angle of the dumping plate 232 change according to the 3D data of the ground of the work target, and leveling work adapted to the ground of the work target can be performed.

[0040] Subsequently, with reference to FIGS. 1(b) and 2, the construction machine 100 of the present embodiment will be described. FIG. 2 is another perspective view showing the lower traveling body 200 and the rotary connecting member 400 included in the construction machine 100 of the present embodiment. As shown in FIGS. 1(b) and 2, the construction machine 100 further includes a first cable 252, a second cable 254, and a relay connector 260. The first cable 252, the second cable 254, and the relay connector 260 are provided on the lower traveling body 200.

[0041] The first cable 252 is electrically connected to the target prism 242. The first cable 252 extends from the target prism 242 to the relay connector 260 and is electrically connected to the relay connector 260. Note that the first cable 252 is detachably connected to the relay connector 260. The second cable 254 is electrically connected to the angle sensor 244. The second cable 254 extends from the angle sensor 244 to the relay connector 260 and is electrically connected to the relay connector 260. Note that the second cable 254 is detachably connected to the relay connector 260. The second cable 254 is an example of a "third electric wire".

[0042] The relay connector 260 is disposed in front of the center frame 222. The relay connector 260 is electrically connected to the rotary connection member 400. Accordingly, the target prism 242 and the angle sensor 244 are electrically connected to the rotary connection member 400.

[0043] Specifically, as shown in FIG. 2, the relay connector 260 includes a first connector 262 and a second connector 264. The first cable 252 is connected to the first connector 262. The second cable 254 is connected to the second connector 264. The first connector 262 and the second connector 264 are each electrically connected to the rotary connection member 400.

[0044] Subsequently, referring to FIG. 2, the construction machine 100 of the present embodiment will be further described. As shown in FIG. 2, the construction machine 100 further includes a pair of left and right pivot bodies 222a, 222b and a cylinder support 222c. The earth discharging device 230 further has a lift cylinder 234a, a tilt cylinder 234b, and a pair of left and right angle cylinders 234c.

[0045] The pair of left and right pivot bodies 222a, 222b and the cylinder support 222c are provided on the lower traveling body 200. Specifically, the pair of left and right pivot bodies 222a, 222b and the cylinder support 222c are connected to the front surface of the center frame 222 and protrude forward from the front surface of the center frame 222. That is, the pair of left and right pivot bodies 222a, 222b and the cylinder support 222c protrude from the center frame 222 of the lower traveling body 200 toward the earth discharging plate 232.

[0046] The cylinder support 222c is positioned between a pair of left and right pivot members 222a and 222b. Specifically, the cylinder support 222c is located at the center of the center frame 222 in the Y-axis direction (left and right direction). Among the pair of left and right pivot members 222a and 222b, the pivot member 222a is located on the left side of the cylinder support 222c, and the pivot member 222b is located on the right side of the cylinder support 222c. Therefore, the pivot member 222a, the cylinder support 222c, and the pivot member 222a are arranged side by side in this order in the Y-axis direction (left and right direction). Specifically, the pivot member 222a, the cylinder support 222c, and the pivot member 222a are arranged side by side in this order from left to right.

[0047] The lift cylinder 234a, the tilt cylinder 234b, and the angle cylinder 234c are telescopically movable. The lift cylinder 234a, the tilt cylinder 234b, and the angle cylinder 234c are hydraulic cylinders. The lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c drive the dump plate 232. That is, the lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c operate the dump plate 232 with respect to the lower traveling body 200.

[0048] Specifically, the lift cylinder 234a lifts the dump plate 232. Specifically, when the lift cylinder 234a expands and contracts, the dump plate 232 performs a lifting operation. That is, the dump plate 232 moves in the vertical direction.

[0049] The tilt cylinder 234b tilts the dump plate 232. Specifically, when the tilt cylinder 234b expands and contracts, the dump plate 232 performs a tilting operation. That is, the dump plate 232 rotates left and right about a rotation axis parallel to the X-axis direction (front and back direction).

[0050] A pair of left and right angle cylinders 234c are located on both the left and right sides of the lift cylinder 234a. The pair of left and right angle cylinders 234c operate the left and right ends of the earth discharge plate 232 in the front-rear direction to cause the earth discharge plate 232 to perform an angle operation. Specifically, when one angle cylinder 234c extends and the other angle cylinder 234c contracts, the earth discharge plate 232 rotates left and right about a rotation axis parallel to the Z-axis direction (vertical direction).

[0051] The lift cylinder 234a is supported by a cylinder support 222c. Specifically, the cylinder support 222c rotatably supports the base end portion (the end portion on the center frame 222 side) of the lift cylinder 234a in the vertical direction.

[0052] Of the pair of left and right angle cylinders 234c, the left angle cylinder 234c is supported by a pivot body 222a via an arm member. Of the pair of left and right angle cylinders 234c, the right angle cylinder 234c is supported by a pivot body 222b via another arm member. Specifically, the pivot body 222a rotatably supports the base end portion (the end portion on the center frame 222 side) of the arm member to which the left angle cylinder 234c is attached in the vertical direction. Similarly, the pivot body 222b rotatably supports the base end portion (the end portion on the center frame 222 side) of the arm member to which the right angle cylinder 234c is attached in the vertical direction.

[0053] As shown in FIG. 2, the relay connector 260 is disposed between the pivot body 222a and the cylinder support 222c.

[0054] Subsequently, with reference to FIG. 2, the construction machine 100 of the present embodiment will be further described. As shown in FIG. 2, the construction machine 100 further includes a drive system cable 272 and a selector valve 238.

[0055] The drive system cable 272 extends from the front surface of the center frame 222. In the present embodiment, the drive system cable 272 extends from between the pivot joint 222b and the cylinder support 222c. The drive system cable 272 includes a hydraulic hose for driving the earth discharge plate 232. The hydraulic pressure flowing through the hydraulic hose of the drive system cable 272 can control the vertical position of the earth discharge plate 232 and the posture (tilt angle and angle) of the earth discharge plate 232.

[0056] Specifically, the hydraulic hose of the drive system cable 272 extends from the center frame 222 to the selector valve 238 and communicates with the hydraulic hose of the selector valve 238, and extends from the selector valve 238 to the lift cylinder 234a, the tilt cylinder 234b, the left angle cylinder 234c, or the right angle cylinder 234c, respectively, and each hydraulic hose communicating with the lift cylinder 234a, the tilt cylinder 234b, the left angle cylinder 234c, or the right angle cylinder 234c, respectively.

[0057] The selector valve 238 switches the flow of hydraulic pressure toward any one of the lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c. Specifically, the selector valve 238 has a pilot type switching valve, and the drive system cable 272 includes two hydraulic hoses constituting a pilot oil passage for supplying a pilot pressure for switching the valve position of the switching valve and a pilot discharge oil passage. Therefore, by controlling the supply of the pilot pressure, the oil flowing out from the selector valve 238 can be sent toward any one of the lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c.

[0058] Subsequently, with reference to FIGS. 3(a) and 3(b), the rotary coupling member 400 included in the construction machine 100 of the present embodiment will be described. FIG. 3(a) is a perspective view showing the rotary coupling member 400. FIG. 3(b) is a top view showing the rotary coupling member 400.

[0059] As shown in FIGS. 3(a) and 3(b), the rotary coupling member 400 includes a swivel joint 410, a first anti-rotation portion 414t, a slip ring 420, a connecting portion 430, and a second anti-rotation portion 440. The swivel joint 410 extends in the vertical direction. The slip ring 420 is attached to the lower end of the swivel joint 410. Specifically, the connecting portion 430 connects the slip ring 420 to the lower end of the swivel joint 410. In other words, the slip ring 420 is attached to the lower end of the swivel joint 410 via the connecting portion 430.

[0060] The swivel joint 410 includes a body 412 and a shaft 414. The body 412 extends in the vertical direction (Z-axis direction). The body 412 has a substantially cylindrical shape. The shaft 414 is rotatably inserted into the through hole of the body 412. The shaft 414 is rotatable with respect to the body 412. The shaft 414 inserted into the body 412 can rotate about a central axis parallel to the Z-axis. The body 412 is fixed to the lower traveling body 200 (FIG. 2). The shaft 414 rotates with respect to the body 412 as the upper slewing body 300 slews.

[0061] The shaft 414 has a plurality of vertical holes 414p and communication holes 414q. The plurality of vertical holes 414p and the communication holes 414q extend in the Z-axis direction (vertical direction). Specifically, the communication hole 414q extends from the upper end to the lower end of the shaft 414. The communication hole 414q is arranged along the central axis of the shaft 414. Each of the plurality of vertical holes 414p extends vertically downward from the upper end of the shaft 414. The plurality of vertical holes 414p are arranged around the central axis of the shaft 414.

[0062] The plurality of vertical holes 414p function as oil passages. The vertical holes 414p are cylindrical in shape. Typically, the diameters of each of the plurality of vertical holes 414p are equal to each other. The communication holes 414q function as wiring paths. For example, a cable for signal transmission or power supply is inserted into the communication holes 414q. The communication holes 414q are cylindrical in shape. Here, the diameter (e.g., the length in the X direction) of the communication holes 414q is larger than the diameter (e.g., the length in the X direction) of the vertical holes 414p.

[0063] A part of the shaft 414 is inserted into the through hole of the body 412, and the upper and lower portions of the shaft 414 protrude from the body 412. A first anti-rotation portion 414t is fixed to the upper portion of the shaft 414. The first anti-rotation portion 414t protrudes radially outward from the shaft 414. The first anti-rotation portion 414t engages with the upper rotating body 300 (FIG. 1(a)). Therefore, the shaft 414 rotates together with the rotation of the upper rotating body 300.

[0064] The slip ring 420 has a rotor 422 and a stator 424 that are electrically connected. The slip ring 420 further has a terminal portion 426. The rotor 422 is rotatable with respect to the stator 424. The terminal portion 426 is attached to the stator 424. In the present embodiment, the terminal portion 426 protrudes from the side surface of the stator 424. The stator 424 electrically connects the rotor 422 and the terminal portion 426. For example, the rotor 422 may have a ring portion, the stator 424 may have a brush portion that slides with respect to the ring portion, the ring portion and the brush portion may be electrically connected, and the brush portion may be electrically connected to the terminal portion 426.

[0065] The rotor 422 is electrically connected to a cable disposed in the communication hole 414q of the shaft 414. As a result, the cable disposed in the communication hole 414q of the shaft 414 is electrically connected to the terminal portion 426. For example, the cable disposed in the communication hole 414q of the shaft 414 may be connected to the ring portion of the rotor 422.

[0066] The connecting portion 430 connects the lower end of the shaft 414 of the swivel joint 410 and the rotor 422 of the slip ring 420. The connecting portion 430 rotates together with the shaft 414 with respect to the body 412. For example, the connecting portion 430 includes a socket or a spacer. Note that the connecting portion 430 may be omitted. That is, the shaft 414 of the swivel joint 410 and the rotor 422 of the slip ring 420 may be directly connected.

[0067] Subsequently, the body 412 will be further described. The body 412 has a body main body portion 412a and a fixing portion 412b. The shaft 414 penetrates the body main body portion 412a.

[0068] The fixing portion 412b is located at the lower part of the body 412. The fixing portion 412b is fixed to the lower traveling body 200 (FIG. 2). As a result, the body main body portion 412a is fixed to the lower traveling body 200. The fixing portion 412b extends in the X-axis direction with respect to the body main body portion 412a.

[0069] The second anti-rotation portion 440 is attached to the body 412 of the swivel joint 410. In the present embodiment, the second anti-rotation portion 440 is attached to the fixing portion 412b of the swivel joint 410. The second anti-rotation portion 440 restricts the rotation of the stator 424 of the slip ring 420. That is, the second anti-rotation portion 440 restricts the rotation of the terminal portion 426. Specifically, the second anti-rotation portion 440 restricts the rotation of the stator 424 as the rotor 422 of the slip ring 420 rotates.

[0070] For example, the second anti-rotation portion 440 may restrict the rotation of the stator 424 by contacting the terminal portion 426. Alternatively, the second anti-rotation portion 440 may contact the stator 424 to restrict the rotation of the stator 424. In the present embodiment, the second anti-rotation portion 440 extends vertically downward from the fixing portion 412b and engages with the terminal portion 426. As a result, the terminal portion 426 (stator 424) is fixed with respect to the body 412 of the swivel joint 410, and the rotation of the terminal portion 426 (stator 424) is restricted.

[0071] Next, referring to FIGS. 3(a), 3(b), 4(a), and 4(b), the rotary coupling member 400 included in the construction machine 100 of the present embodiment will be described in detail. FIG. 4(a) is a side view showing the body 412 and the second anti-rotation portion 440 of the rotary coupling member 400. FIG. 4(b) is a top view showing the body 412.

[0072] As shown in FIGS. 4(a) and 4(b), the body 412 of the swivel joint 410 is cylindrical. The body 412 has a through hole 412h extending in the Z-axis direction (vertical direction). A shaft 414 is inserted into the through hole 412h.

[0073] As shown in FIGS. 3(a) and 4(a), the body 412 has a first horizontal hole 412p. The first horizontal hole 412p extends in the horizontal direction. The first horizontal hole 412p communicates the inside and the outside of the body 412. A plurality of first horizontal holes 412p are provided on the side portion of the body 412. The first horizontal hole 412p is used as an oil passage. The first horizontal hole 412p is connected to the oil passage on the lower traveling body 200 side.

[0074] Specifically, the plurality of first horizontal holes 412p correspond to the plurality of vertical holes 414p described with reference to FIGS. 3(a) and 3(b), and each of the first horizontal holes 412p communicates with a different vertical hole 414p. Note that each of the plurality of vertical holes 414p shown in FIGS. 3(a) and 3(b) extends to a position communicating with the corresponding first horizontal hole 412p.

[0075] FIG. 4(c) is a side view showing the shaft 414, the slip ring 420, the connecting portion 430, and the first anti-rotation portion 414t of the rotary coupling member 400. FIG. 4(d) is a top view showing the shaft 414 and the first anti-rotation portion 414t.

[0076] As shown in FIGS. 4(c) and 4(d), the shaft 414 has a substantially cylindrical shape. As shown in FIGS. 3(a) and 4(c), the shaft 414 has a plurality of second lateral holes 414r. The second lateral holes 414r extend in the horizontal direction. The plurality of second lateral holes 414r are provided at the upper part of the shaft 414. The second lateral holes 414r are connected to the oil passages on the upper swivel body 300 side. The plurality of second lateral holes 414r correspond to the plurality of vertical holes 414p, and each of the second lateral holes 414r communicates with a different vertical hole 414p.

[0077] Although omitted in FIG. 4(c) for simplicity of the drawing, a plurality of O-rings are vertically arranged and mounted on the peripheral surface of the shaft 414. The plurality of O-rings seal (partition) the space between the peripheral surface of the shaft 414 and the inner peripheral surface of the body main body portion 412a by adjacent O-rings, and form oil passages corresponding to the respective hydraulic actuators installed in the lower traveling body 200. The oil passages formed by the plurality of O-rings communicate with different first lateral holes 412p (FIG. 4(a)).

[0078] Subsequently, with reference to FIG. 5, the rotary coupling member 400 included in the construction machine 100 of the present embodiment will be described. FIG. 5 is an exploded perspective view of the rotary coupling member 400.

[0079] The slip ring 420 electrically connects a cable passing through the communication hole 414q of the swivel joint 410 and a cable connected to the terminal portion 426 of the slip ring 420. Specifically, as shown in FIG. 5, the slip ring 420 further has a terminal portion 428. The terminal portion 428 is provided on the rotor 422 and is electrically connected to the terminal portion 426. A cable passing through the communication hole 414q of the swivel joint 410 is connected to the terminal portion 428.

[0080] As shown in FIG. 5, the rotor 422 has a main body portion 422a and a flange portion 422f. The flange portion 422f projects radially outward from the upper outer edge of the main body portion 422a. Therefore, the diameter of the flange portion 422f is larger than the diameter of the main body portion 422a. Bolt holes 422q are provided in the flange portion 422f.

[0081] The connecting portion 430 is fixed to the flange portion 422f of the slip ring 420. That is, the connecting portion 430 is fixed to the rotor 422. Note that the outer edge of the connecting portion 430 is substantially equal to the outer edge of the flange portion 422f.

[0082] The connecting portion 430 has a thin disk shape, and a through hole 430h is provided at the center of the connecting portion 430. The cable inserted into the communication hole 414q of the swivel joint 410 is connected to the terminal portion 428 of the slip ring 420 through the through hole 430h of the connecting portion 430.

[0083] The connecting portion 430 has a main surface 430a and a main surface 430b. The main surface 430a of the connecting portion 430 faces the swivel joint 410, and the main surface 430b of the connecting portion 430 faces the slip ring 420. The through hole 430h of the connecting portion 430 penetrates between the main surface 430a and the main surface 430b of the connecting portion 430.

[0084] A depression 430p communicating with the through hole 430h is provided on the main surface 430b. The outer diameter of the depression 430p is smaller than the outer diameter of the flange portion 422f of the slip ring 420. The connecting portion 430 is provided with a bolt hole 430s penetrating the depression 430p in the vertical direction and a bolt hole 430t extending in the vertical direction outside the depression 430p. The bolt hole 430s is provided at the bottom surface of the depression 430p of the connecting portion 430, and the bolt hole 430t is provided outside the depression 430p of the connecting portion 430.

[0085] Corresponding to the bolt hole 430s of the connecting portion 430, a bolt hole 414s is provided in the shaft 414 of the swivel joint 410, and the bolt hole 414s is threaded. A bolt b1 is inserted into the bolt hole 430s and the bolt hole 414s, and the connecting portion 430 is fixed to the shaft 414 of the swivel joint 410.

[0086] Also, the bolt hole 430t is threaded. A bolt b2 is inserted into the bolt hole 422q of the slip ring 420 and the bolt hole 430t of the connecting portion 430, and the slip ring 420 is fixed to the connecting portion 430.

[0087] Therefore, when the shaft 414 rotates with the rotation of the upper swing body 300, the connecting portion 430 and the rotor 422 rotate. That is, the rotor 422 rotates with the rotation of the upper swing body 300.

[0088] Furthermore, a communication hole 430r is provided in the main surface 430b of the connecting portion 430. The communication hole 430r communicates the depression 430p of the connecting portion 430 with the outside of the connecting portion 430. Even when a liquid such as rainwater or cleaning liquid enters the inside of the rotary connecting member 400 through the communication hole 430r, damage to the slip ring 420 can be suppressed. In particular, the construction machine 100 may be significantly soiled during operation, and the soil on the construction machine 100 is often washed with high-pressure cleaning liquid, so that a liquid may enter the inside of the rotary connecting member 400. However, due to the communication hole 430r of the connecting portion 430, even if a liquid enters the inside of the rotary connecting member 400, the entered liquid can be discharged to the outside of the rotary connecting member 400.

[0089] Subsequently, with reference to FIG. 5, the second anti-rotation portion 440 will be described. As shown in FIG. 5, the second anti-rotation portion 440 has a locking portion 442. In the locking portion 442, the second anti-rotation portion 440 is recessed from the vertically lower side to the vertically upper side. The locking portion 442 locks the terminal portion 426 of the slip ring 420. The diameter of the locking portion 442 is substantially equal to the diameter of the terminal portion 426 or slightly larger than the diameter of the terminal portion 426. As described above, since the locking portion 442 of the second anti-rotation portion 440 engages with the terminal portion 426 of the slip ring 420, even if the rotor 422 of the slip ring 420 rotates, it is possible to suppress the stator 424 and the terminal portion 426 from rotating together with the rotor 422.

[0090] Next, with reference to FIG. 6, the lower traveling body 200 and the slewing connecting member 400 included in the construction machine 100 of the present embodiment will be described. FIG. 6 is a perspective view showing the slewing connecting member 400 and its vicinity.

[0091] As shown in FIG. 6, the center frame 222 has a circular through-hole 222p and a support portion 222s extending in the X-axis direction. The through-hole 222p is provided at the center of the center frame 222 and opens the upper part of the center frame 222 in a circular shape. The support portion 222s is disposed inside the center frame 222. The support portion 222s overlaps the through-hole 222p when the center frame 222 is viewed from above.

[0092] The slewing connecting member 400 is supported by the support portion 222s of the center frame 222. Specifically, the fixing portion 412b of the body 412 is fixed to the support portion 222s. The shaft 414 rotates integrally with the upper slewing body 300 by the first anti-rotation portion 414t. Therefore, while the shaft 414 is rotatable with respect to the lower traveling body 200 together with the upper slewing body 300, the body 412 of the swivel joint 410 is fixed to the lower traveling body 200.

[0093] As described with reference to FIGS. 4(a) and 4(c), the second lateral hole 414r of the shaft 414 communicates with the longitudinal hole 414p of the shaft 414, and the first lateral hole 412p of the body main body portion 412a also communicates with the longitudinal hole 414p of the shaft 414. An oil passage on the upper slewing body 300 side is connected to the second lateral hole 414r of the shaft 414. The first lateral hole 412p of the body main body portion 412a is disposed inside the center frame 222 and is connected to an oil passage on the lower traveling body 200 side. Therefore, the swivel joint 410 constitutes an oil passage that connects the oil passage on the upper slewing body 300 side and the oil passage on the lower traveling body 200 side.

[0094] As shown in FIG. 6, the construction machine 100 further includes a cable 340. The cable 340 is disposed on the upper swing body 300 and is electrically connected to the controller 320 (FIG. 1(a)). The cable 340 is inserted from the upper swing body 300 into the communication hole 414q of the shaft 414.

[0095] As described with reference to FIGS. 3(a), 3(b), 4(a) to 4(d), and FIG. 5, the cable 340 extends to the rotor 422 of the slip ring 420 through the communication hole 414q and is electrically connected to the rotor 422. The cable 340 is an example of the "second electric wire". Note that the cable 340 may be a cable laid on the upper swing body 300 or a cable dedicated to the rotary coupling member 400.

[0096] The cable 340 rotates together with the rotation of the upper swing body 300. According to the present embodiment, the shaft 414 of the swivel joint 410 and the rotor 422 of the slip ring 420 rotate together with the rotation of the upper swing body 300. Therefore, even if the cable 340 rotates together with the rotation of the upper swing body 300, the cable 340 is not cut.

[0097] Subsequently, with reference to FIGS. 7 and 8, the lower traveling body 200 included in the construction machine 100 of the present embodiment will be described. FIG. 7 is a perspective view showing the lower traveling body 200 included in the construction machine 100 of the present embodiment. Specifically, FIG. 7 shows the lower traveling body 200 viewed obliquely downward. FIG. 8 is a front view showing the lower traveling body 200 included in the construction machine 100 of the present embodiment. Specifically, FIG. 8 shows the lower traveling body 200 viewed from the front.

[0098] As shown in FIGS. 7 and 8, the construction machine 100 further includes a cover member 280. The cover member 280 is provided on the lower surface 221a of the lower traveling body 200. More specifically, the center frame 222 has a bottom plate 221, and the cover member 280 is disposed on the lower surface of the bottom plate 221 of the center frame 222. The lower surface of the bottom plate 221 of the center frame 222 constitutes the lower surface 221a of the lower traveling body 200.

[0099] In this embodiment, the cover member 280 includes a first cover member 281 and a second cover member 282. As shown in FIG. 7, the first cover member 281 is located at the center of the center frame 222 in the X-axis direction (front-rear direction), and as shown in FIG. 8, it extends in the Y-axis direction (left-right direction). The second cover member 282 is connected to the first cover member 281 and extends forward from the first cover member 281 as shown in FIG. 7. Specifically, the second cover member 282 extends down to below the relay connector 260.

[0100] Subsequently, with reference to FIGS. 7 and 8, the lower traveling body 200 included in the construction machine 100 of this embodiment will be further described. As shown in FIGS. 7 and 8, the cylinder support 222c protrudes from the front surface 223a (FIG. 8) of the lower traveling body 200. The front surface 223a is an example of a "side surface". Specifically, as shown in FIG. 8, the center frame 222 has a front plate 223, and the cylinder support 222c protrudes from the front plate 223 of the center frame 222. The front surface of the front plate 223 of the center frame 222 constitutes the front surface 223a of the lower traveling body 200.

[0101] Note that the relay connector 260 is located in front of the front surface 223a of the lower traveling body 200. That is, the relay connector 260 is located in front of the front plate 223 of the center frame 222.

[0102] Subsequently, with reference to FIG. 9, the lower traveling body 200 included in the construction machine 100 of this embodiment will be described. FIG. 9 is a front view showing an enlarged part of the lower traveling body 200. However, in FIG. 9, the cover member 280 is not shown for ease of understanding.

[0103] As described with reference to FIGS. 1(b) and 6, the rotary coupling member 400 is disposed on the lower traveling body 200. Accordingly, the swivel joint 410 and the slip ring 420 are disposed on the lower traveling body 200. The slip ring 420 is connected to the lower end of the swivel joint 410, and as shown in FIG. 9, a part of the slip ring 420 protrudes vertically downward from the lower surface 221a of the lower traveling body 200. In the present embodiment, as shown in FIG. 9, the stator 424 is included in a portion of the slip ring 420 that protrudes from the lower surface 221a (lower surface of the center frame 222) of the lower traveling body 200. As a result, the stator 424 is located below the lower traveling body 200 (center frame 222).

[0104] According to the present embodiment, since the slip ring 420 is connected to the lower end of the swivel joint 410, a part of the slip ring 420 can be made to protrude from the lower surface 221a (lower surface of the center frame 222) of the lower traveling body 200. As a result, it is possible to suppress an increase in the height of the driver's seat.

[0105] Specifically, when the slip ring 420 is connected to the swivel joint 410, the driver's seat may be raised by the height of the slip ring 420. On the other hand, in the present embodiment, since a part of the slip ring 420 protrudes from the lower surface 221a (lower surface of the center frame 222) of the lower traveling body 200, it is possible to suppress an increase in the height of the driver's seat by the height of the slip ring 420. Therefore, it is difficult for the position of the center of gravity of the construction machine 100 to increase, and it is difficult for the stability of the construction machine 100 to decrease. Since the stability of the construction machine 100 does not decrease, the riding comfort is also unlikely to decrease. Further, since the driver's seat does not become higher, the operator can easily get on the driver's seat.

[0106] Subsequently, with reference to FIGS. 7 to 10, the lower traveling body 200 included in the construction machine 100 of the present embodiment will be described. FIG. 10 is another front view showing an enlarged part of the lower traveling body 200.

[0107] As shown in FIGS. 7 to 10, the cover member 280 covers a portion of the slip ring 420 that protrudes from the lower surface 221a (the lower surface of the center frame 222) of the lower traveling body 200. Specifically, the first cover member 281 covers a portion of the slip ring 420 that protrudes from the lower surface 221a (the lower surface of the center frame 222) of the lower traveling body 200. In the present embodiment, the first cover member 281 covers the stator 424 of the slip ring 420.

[0108] According to the present embodiment, since the cover member 280 covers a portion (the stator 424) of the slip ring 420 that protrudes from the lower surface 221a (the lower surface of the center frame 222) of the lower traveling body 200, foreign matters such as earth and sand flying from below the lower traveling body 200 toward the lower surface 221a (the lower surface of the center frame 222) of the lower traveling body 200 during the traveling of the construction machine 100 can be prevented from colliding with the slip ring 420 (the stator 424). Therefore, the slip ring 420 can be prevented from being damaged.

[0109] Subsequently, referring to FIG. 10, the lower traveling body 200 included in the construction machine 100 of the present embodiment will be further described. As shown in FIG. 10, in the present embodiment, the lower surface of the first cover member 281 is located above the lowermost portion 222cb of the cylinder support 222c. Therefore, before an obstacle passing below the lower traveling body 200 during the traveling of the construction machine 100 collides with the first cover member 281, the lowermost portion 222cb of the cylinder support 222c collides with the obstacle, so that the first cover member 281 can be prevented from colliding with the obstacle and being damaged. As a result, the slip ring 420 can be prevented from being damaged by an obstacle passing below the lower traveling body 200 during the traveling of the construction machine 100.

[0110] Subsequently, referring to FIG. 11, the lower traveling body 200 included in the construction machine 100 of the present embodiment will be described. FIG. 11 is a bottom view showing a part of the lower traveling body 200 and the rotary coupling member 400. However, for ease of understanding, in FIG. 10, the cover member 280 (the first cover member 281 and the second cover member 282) is omitted.

[0111] As shown in FIG. 11, the construction machine 100 further includes a cable 256. The cable 256 is disposed on the lower traveling body 200. The cable 256 is electrically connected to the stator 424 of the slip ring 420. Specifically, the cable 256 is connected to the terminal portion 426 of the slip ring 420. Therefore, the cable 256 is electrically connected to the cable 340 described with reference to FIG. 6. The cable 256 is an example of a "first electric wire".

[0112] The cable 256 extends from the terminal portion 426 of the slip ring 420 (stator 424) to the relay connector 260 and is connected to the relay connector 260. Specifically, the cable 256 is electrically connected to the relay connector 260. Therefore, the relay connector 260 is electrically connected to the terminal portion 426 of the slip ring 420 (stator 424) via the cable 256. Thus, the relay connector 260 is electrically connected to the cable 340 described with reference to FIG. 6 via the cable 256 and the slip ring 420. As a result, the relay connector 260 is electrically connected to the controller 320 described with reference to FIG. 1(a).

[0113] The relay connector 260 electrically connects the first cable 252 and the second cable 254 described with reference to FIGS. 1(b) and 2 to the cable 256. Therefore, the controller 320 (FIG. 1(a)) and the target prism 242 (FIG. 1(b)) are electrically connected via the cable 340 (FIG. 6), the slip ring 420, the cable 256, the relay connector 260 (first connector 262), and the first cable 252 (FIG. 1(b)). Also, the controller 320 (FIG. 1(a)) and the angle sensor 244 (FIG. 1(b)) are electrically connected via the cable 340 (FIG. 6), the slip ring 420, the cable 256, the relay connector 260 (second connector 264), and the second cable 254 (FIG. 1(b)).

[0114] In this way, the rotary coupling member 400 electrically connects a cable (cable 340) on the upper swing body 300 side that extends from the upper swing body 300 to the lower traveling body 200 and a cable (cable 256) disposed on the lower traveling body 200. For this reason, it is possible to suppress the cable (cable 256) disposed on the lower traveling body 200 from being damaged due to the swinging operation of the upper swing body 300.

[0115] Here, the controller 320 will be described. When a plurality of construction machines 100 perform work at one work site, a total station is provided for each construction machine 100. In this case, each construction machine 100 needs to communicate only with a specific total station that tracks a target prism 242 attached to the own machine. In the present embodiment, the controller 320 transmits and receives an authentication signal to and from the target prism 242 so that it can communicate only with a specific total station in the dump plate control mode.

[0116] Specifically, the authentication signal is transmitted and received between the controller 320 (FIG. 1(a)) and the target prism 242 (FIG. 1(b)) via the cable 340 (FIG. 6), the slip ring 420, the cable 256, the relay connector 260 (first connector 262), and the first cable 252 (FIG. 1(b)).

[0117] In addition, the controller 320 supplies driving power to the target prism 242 in order to transmit and receive an authentication signal to and from the target prism 242. Specifically, the controller 320 generates first driving power for driving the target prism 242 from the power supplied to the power feeder and supplies it to the target prism 242. Specifically, the first driving power is supplied from the controller 320 to the target prism 242 via the cable 340 (FIG. 6), the slip ring 420, the cable 256, the relay connector 260 (first connector 262), and the first cable 252 (FIG. 1(b)).

[0118] Further, in the dump plate control mode, the controller 320 supplies power to the angle sensor 244 and receives a signal indicating the tilt angle from the angle sensor 244.

[0119] Specifically, the controller 320 generates second drive power for driving the angle sensor 244 from the power supplied to the power feeder and supplies it to the angle sensor 244. Specifically, the second drive power is supplied from the controller 320 to the angle sensor 244 via the cable 340 (FIG. 6), the slip ring 420, the cable 256, the relay connector 260 (second connector 264), and the second cable 254 (FIG. 1(b)). Further, the signal indicating the tilt angle is transmitted from the angle sensor 244 to the controller 320 via the second cable 254 (FIG. 1(b)), the relay connector 260 (second connector 264), the cable 256, the slip ring 420, and the cable 340 (FIG. 6).

[0120] Subsequently, referring to FIG. 11, the construction machine 100 of the present embodiment will be further described. As shown in FIG. 11, the cable 256 is routed outside the lower traveling body 200. Therefore, the routing of the cable 256 becomes easy. Specifically, the internal space of the center frame 222 is occupied by hydraulic piping and hydraulic equipment. Therefore, when arranging the cable 256 in the internal space of the center frame 222, it is necessary to arrange it in the narrow gaps between the hydraulic piping and the hydraulic equipment, and the routing of the cable 256 is not easy. On the other hand, according to the present embodiment, since the cable 256 can be arranged outside the lower traveling body 200, the routing of the cable 256 becomes easy.

[0121] In this embodiment, the cable 256 is arranged below the lower surface 221a of the lower traveling body 200. As already described, the stator 424 (terminal portion 426) of the slip ring 420 is located below the lower surface 221a of the lower traveling body 200. Therefore, by arranging the cable 256 below the lower surface 221a of the lower traveling body 200, the connection between the cable 256 and the terminal portion 426 of the slip ring 420 (stator 424) becomes easy. Further, according to this embodiment, since the stator 424 (terminal portion 426) of the slip ring 420 is located outside the lower traveling body 200, the cable 256 can be easily arranged outside the lower traveling body 200.

[0122] Subsequently, referring to FIGS. 10 to 12, the lower traveling body 200 included in the construction machine 100 of this embodiment will be described. FIG. 12 is another bottom view showing a part of the lower traveling body 200 and the rotary coupling member 400.

[0123] As shown in FIGS. 11 and 12, the second cover member 282 extends from the side (left side) of the terminal portion 426 of the slip ring 420 (stator 424) to the relay connector 260 and covers the cable 256.

[0124] According to this embodiment, since the second cover member 282 covers the cable 256, it is possible to prevent foreign matters such as earth and sand flying from below the lower traveling body 200 toward the lower surface 221a (lower surface of the center frame 222) of the lower traveling body 200 during the traveling of the construction machine 100 from colliding with the cable 256. Therefore, it is possible to prevent the cable 256 from being damaged.

[0125] As shown in FIGS. 7 and 12, in this embodiment, the first cover member 281 covers a part of the second cover member 282. However, the first cover member 281 does not necessarily have to cover the second cover member 282.

[0126] Next, referring to FIG. 10, the second cover member 282 will be described. As shown in FIG. 10, in the present embodiment, the lower surface of the second cover member 282 is positioned above the lowermost portion 222cb of the cylinder support 222c. Therefore, before an obstacle passing under the lower traveling body 200 during the traveling of the construction machine 100 collides with the second cover member 282, the lowermost portion 222cb of the cylinder support 222c collides with the obstacle, so that the second cover member 282 can be prevented from colliding with the obstacle and being damaged. As a result, it is possible to prevent the cable 256 from being damaged by an obstacle passing under the lower traveling body 200 during the traveling of the construction machine 100.

[0127] Next, referring to FIG. 13, the lower traveling body 200 included in the construction machine 100 of the present embodiment will be described. FIG. 13 is a schematic cross-sectional view showing a part of the lower traveling body 200.

[0128] As shown in FIG. 13, the front surface 223a (the front surface of the center frame 222) of the lower traveling body 200 faces the relay connector 260. Specifically, the relay connector 260 is disposed away from the front surface 223a of the lower traveling body 200. The cable 256 has a first bent portion 256a and a second bent portion 256b. The second bent portion 256b is positioned above the first bent portion 256a.

[0129] The cable 256 rises between the relay connector 260 and the front surface 223a of the lower traveling body 200 and bends toward the front surface 223a of the lower traveling body 200 at the first bent portion 256a. Further, the cable 256 bends toward the relay connector 260 at the second bent portion 256b and extends to the relay connector 260.

[0130] According to the present embodiment, after the cable 256 is bent toward the front surface 223a of the lower traveling body 200, it is bent toward the relay connector 260, so that the relay connector 260 can be brought closer to the front surface 223a of the lower traveling body 200. For example, compared with a configuration in which the cable 256 rises between the relay connector 260 and the front surface 223a of the lower traveling body 200 and then bends toward the relay connector 260, the relay connector 260 can be brought closer to the front surface 223a of the lower traveling body 200 by the amount of bending toward the front surface 223a of the lower traveling body 200.

[0131] In this way, by bringing the relay connector 260 closer to the front surface 223a of the lower traveling body 200, it becomes difficult for the relay connector 260 to come into contact with an obstacle or the like. Therefore, it is possible to suppress damage to the relay connector 260.

[0132] Subsequently, with reference to FIGS. 13 and 14, the cover member 280 and the relay connector 260 included in the construction machine 100 of the present embodiment will be described. FIG. 14 is a front view showing the second cover member 282 and the relay connector 260.

[0133] As shown in FIG. 13, the second cover member 282 has an overhanging portion 282a and a connector support portion 283. The overhanging portion 282a protrudes from the lower traveling body 200 toward the relay connector 260 side. The connector support portion 283 is fixed to the overhanging portion 282a and supports the relay connector 260. Specifically, the overhanging portion 282a protrudes forward from the lower surface 221a (lower surface of the center frame 222) of the lower traveling body 200 and extends to below the relay connector 260. The connector support portion 283 is plate-shaped and protrudes upward from the overhanging portion 282a.

[0134] Specifically, as shown in FIG. 14, the connector support portion 283 has a through hole 283a. The through hole 283a penetrates the connector support portion 283 in the front-rear direction (X-axis direction). The relay connector 260 is inserted into the through hole 283a and supported by the connector support portion 283.

[0135] Therefore, according to this embodiment, the relay connector 260 can be disposed away from the lower traveling body 200. As a result, the cable 256 can be disposed outside the lower traveling body 200. Further, according to this embodiment, the relay connector 260 can be supported by using the second cover member 282. Therefore, the number of parts of the construction machine 100 can be reduced and resources can be saved. In this embodiment, the relay connector 260 is supported by using the second cover member 282, but dedicated parts for supporting the relay connector 260 may be provided on the lower traveling body 200.

[0136] Further, according to this embodiment, a portion of the cable 256 that is exposed between the lower traveling body 200 and the relay connector 260 can be covered by the overhanging portion 282a of the second cover member 282. Thus, it is possible to prevent foreign matters such as earth and sand flying from below the lower traveling body 200 during the traveling of the construction machine 100 from colliding with the portion of the cable 256 that is exposed between the lower traveling body 200 and the relay connector 260.

[0137] Subsequently, with reference to FIGS. 14 and 15, the lower traveling body 200 included in the construction machine 100 of this embodiment will be described. FIG. 15 is a perspective view showing an enlarged part of the lower traveling body 200. Specifically, FIG. 15 shows the relay connector 260 and its vicinity. In FIGS. 14 and 15, for ease of understanding, the covers 260a and 260b are shown disassembled.

[0138] As shown in FIGS. 14 and 15, the relay connector 260 further includes a pair of upper and lower covers 260a and 260b. The cover 260a is located above the cover 260b. The pair of upper and lower covers 260a and 260b have cutout portions that are cut out so as to fit the cross-sectional shapes of the first connector 262 and the second connector 264, and sandwich the first connector 262 and the second connector 264. The pair of upper and lower covers 260a and 260b are each fixed to the connector support portion 283 by, for example, bolts.

[0139] The embodiments of the present invention have been described above with reference to the drawings (Figs. 1(a) to 15). However, the present invention is not limited to the above embodiments and can be implemented in various forms without departing from the gist thereof. Also, the plurality of components disclosed in the above embodiments can be modified as appropriate. For example, a component among all the components shown in a certain embodiment may be added to the components of another embodiment, or some of the components among all the components shown in a certain embodiment may be deleted from the embodiment.

[0140] The drawings schematically show each component mainly for facilitating the understanding of the invention, and the thickness, length, number, interval, etc. of each illustrated component may be different from the actual ones for convenience in drawing preparation. Also, it goes without saying that the configuration of each component shown in the above embodiments is an example and is not particularly limited, and various changes are possible without substantially departing from the effects of the present invention.

[0141] For example, in the embodiment described with reference to Figs. 1(a) to 15, the tilt angle of the discharge plate 232 is detected by the angle sensor 244. However, in addition to the angle sensor 244, the construction machine 100 may further include an angle sensor for detecting the angle of the discharge plate 232.

[0142] Also, in the embodiment described with reference to Figs. 1(a) to 15, the selector valve 238 has a pilot-operated switching valve. However, the selector valve 238 may have a solenoid valve instead of the pilot-operated switching valve. In this case, instead of the hydraulic hose for supplying the pilot pressure, a cable for transmitting a switching signal for switching the valve position of the solenoid valve is provided.

[0143] Also, in the embodiment described with reference to FIGS. 1(a) to 15, the construction machine 100 is provided with the target prism 242. However, the construction machine 100 may be provided with a Global Navigation Satellite System (GNSS) antenna instead of the target prism 242. In this case, the three-dimensional coordinates of the dumping plate 232 can be obtained without using a total station. Specifically, the position information of the GNSS antenna is input into the controller 320 via the first cable 252, the relay connector 260 (the first connector 262), the cable 256, the slip ring 420, and the cable 340 from the GNSS antenna. The controller 320 obtains the three-dimensional coordinates of the dumping plate 232 based on the position information of the GNSS antenna.

[0144] Also, in the embodiment described with reference to FIGS. 1(a) to 15, the cable 256 is arranged below the lower surface 221a of the lower traveling body 200. However, the cable 256 may be arranged outside the lower traveling body 200. For example, the cable 256 may extend upward from the terminal portion 426 at the lower end of the rotary coupling member 400, extend out from the upper surface of the lower traveling body 200, and then be arranged above the upper surface of the lower traveling body 200.

[0145] Also, in the embodiment described with reference to FIGS. 1(a) to 15, a part of the slip ring 420 protrudes from the lower surface 221a of the lower traveling body 200. However, a part of the slip ring 420 may protrude from the upper surface of the lower traveling body 200. In this case, the cable 256 is arranged above the upper surface of the lower traveling body 200. Alternatively, the cable 256 may extend downward from the terminal portion 426 at the upper end of the rotary coupling member 400, extend out from the lower surface 221a of the lower traveling body 200, and then be arranged below the lower surface 221a of the lower traveling body 200.

[0146] Also, in the embodiment described with reference to FIGS. 1(a) to 15, although a part of the slip ring 420 protruded from the lower surface 221a of the lower traveling body 200, the entire slip ring 420 may be disposed inside the lower traveling body 200. In this case, the cable 256 may be routed outside the lower traveling body 200 after extending from the inside to the outside of the lower traveling body 200.

[0147] For example, the cable 256 may extend vertically downward from the terminal portion 426 of the slip ring 420 and extend from the lower surface 221a of the lower traveling body 200 to the outside of the lower traveling body 200. Alternatively, the cable 256 may extend vertically upward from the terminal portion 426 of the slip ring 420 and extend from the upper surface of the lower traveling body 200 to the outside of the lower traveling body 200.

Industrial Applicability

[0148] The present invention is applicable to construction machines such as hydraulic shovels and has industrial applicability.

Explanation of Reference Numerals

[0149] 100: Construction machine 200: Lower traveling body 221a: Lower surface 222c: Cylinder support 222cb: Lowermost part 230: Earth discharging device 232: Earth discharging plate 234a: Lift cylinder 244: Angle sensor 254: Second cable 256: Cable 256a: First bending part 256b: Second bending part 260: Relay connector 264: Second connector 280: Cover member 281: First cover member 282: Second cover member 282a: Overhanging part 283: Connector support part 300: Upper rotating body 340: Cable 420: Slip ring 422: Rotor 424: Stator 426: Terminal part

Claims

1. A blade supported by a pair of arms arranged along the left-right direction at the front of the self-propelled traveling body; a cable extending from the traveling body toward the blade; the cable extends from the other side of the arm in the left-right direction to the one side of the arm, the other side being located on the one side of the arm in the left-right direction, of the pair of arms as a reference; Working machinery.

2. The one arm includes a guide portion that restricts movement of the cable in the left-right direction.

2. The work machine of claim 1.

3. The guide portion is disposed at a position where the cable and the one cable intersect.

3. A work machine according to claim 2.

4. The guide portion is provided in the vicinity of a portion where a beam spanning the pair of arms in the left-right direction is connected to one of the arms. A work machine according to any one of claims 1 to 3.

5. the guide portion has a circular portion in part, and restricts movement of the cable in the left-right direction by passing the cable through the circular portion; A work machine according to any one of claims 2 to 4.

6. The cable is electrically connected to a target prism disposed on the rear side of the blade. A work machine according to any one of claims 1 to 5.

Images