Construction Machinery

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 a construction machine. [Background technology]

[0002] There is known a construction machine having a self-propelled lower traveling body and an upper rotating body that can rotate relative to the lower traveling body. For example, Patent Document 1 discloses a wheel excavator as such a construction machine having a self-propelled traveling body and a rotating body that can rotate relative to the traveling body.

[0003] The wheel excavator of Patent Document 1 further includes a swivel joint that enables the supply of pressurized oil from the rotating body to the running body. The swivel joint has a housing fixed to the running body and a spindle housed in the housing and rotates as the rotating body rotates. A rotation-preventing member is attached to the upper part of the spindle (the end on the rotating body side). The rotating body is provided with a stopper that restricts rotation of the rotation-preventing member. The stopper restricts the rotation of the rotation-preventing member, causing the spindle to rotate as the rotating body rotates.

[0004] The wheel excavator of Patent Document 1 further includes a slip ring. The slip ring is fixed to a rotation-preventing 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 of the swivel joint (the end part on the rotating body side). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-095183 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in a configuration in which the slip ring is fixed to the upper part of the swivel joint (the end on the rotating 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, which may reduce the stability of the construction machine. Furthermore, when the stability of the construction machine decreases, the ride comfort also decreases. Furthermore, because the driver's seat becomes higher, it may become difficult for the operator to get into the seat.

[0007] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a construction machine that can prevent the driver's seat from becoming too high. [Means for solving the problem]

[0008] According to one aspect of the present invention, a construction machine includes a lower traveling body, an upper rotating body, a slip ring, a first electric wire, and a second electric wire. The lower traveling body is capable of traveling. The upper rotating body is disposed above the lower traveling body. The upper rotating body is capable of rotating relative to the lower traveling body. The slip ring has a stator and a rotor which 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 rotating body to the rotor and is electrically connected to the rotor. The rotor is freely rotatable relative to the stator. The rotor rotates together with the rotation of the upper rotating body. A portion of the slip ring protrudes downward from a lower surface of the lower traveling body. Effect of the Invention

[0009] According to the construction machine of the present invention, the height of the operator's seat can be prevented from increasing. [Brief description of the drawings]

[0010] [Figure 1] 1A is a perspective view showing a construction machine according to an embodiment of the present invention, and FIG. 1B is a perspective view showing a lower traveling body and a rotary connecting member included in the construction machine according to an embodiment of the present invention. [Diagram 2] FIG. 4 is another perspective view showing the lower traveling body and the rotary connecting member included in the construction machine according to the embodiment of the present invention. [Diagram 3] 1A is a perspective view showing a rotary connecting member, and FIG. [Figure 4] 1A is a side view showing the body and the second anti-rotation portion of the rotary coupling member, (b) is a top view showing the body, (c) is a side view showing the shaft, the slip ring and the coupling portion of the rotary coupling member, and (d) is a top view showing the shaft. [Diagram 5] FIG. [Figure 6] FIG. 2 is a perspective view showing a rotary connecting member and its vicinity. [Figure 7] 1 is a perspective view showing a lower traveling body included in a construction machine according to an embodiment of the present invention. [Figure 8] 1 is a front view showing a lower traveling body included in a construction machine according to an embodiment of the present invention. [Figure 9] FIG. 2 is an enlarged front view showing a portion of the lower traveling body. [Figure 10] FIG. 4 is another enlarged front view showing a portion of the lower traveling body. [Figure 11] 4 is a bottom view showing a part of the lower running body and a rotary connecting member. FIG. [Figure 12] FIG. 11 is another bottom view showing a portion of the lower running body and the rotary connecting member. [Figure 13] FIG. 2 is a schematic cross-sectional view showing a part of a lower running body. [Figure 14] 11 is a front view showing the second cover member and the relay connector. FIG. [Figure 15] FIG. 2 is an enlarged perspective view showing a portion of the lower traveling body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the construction machine of the present invention will be described with reference to the drawings (Fig. 1(a) to Fig. 15). However, the present invention is not limited to the following embodiment, and can be embodied in various forms without departing from the gist of the invention. Note that where explanations are repeated, they may be omitted as appropriate. Also, in the drawings, the same or equivalent parts are given the same reference symbols, and explanations will not be repeated.

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

[0013] Furthermore, in this specification, in order to facilitate understanding, the terms "front", "rear", "upper", "lower", "left" and "right" may be used as appropriate. In this embodiment, the side where the earth removal device 230 (FIG. 1(b)) is arranged 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 rotating body 300 (FIG. 1(a)) is arranged 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 type traveling unit 212a (FIG. 1(a)) is arranged with respect to the crawler type traveling unit 212b (FIG. 1(a)) is the "left side", and the opposite side is the "right side". In other words, the left side when viewed from the rear to the front side is the "left side", and the right side when viewed from the rear to the front side is the "right side". However, the terms "front," "rear," "up," "down," "left," and "right" have been defined merely for the convenience of explanation, and the definitions of these directions are not intended to limit the orientation of the construction machine of the present invention when it is used or assembled.

[0014] First, a construction machine 100 of this embodiment will be described with reference to Fig. 1(a) and Fig. 1(b). Here, a hydraulic excavator will be described as an example of the construction machine 100. 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 another type of construction machine.

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

[0016] As shown in Fig. 1(a) and Fig. 1(b), the construction machine 100 includes a lower traveling body 200, an earth removal device 230, an upper rotating body 300, a work implement 330, and a rotary connecting member 400. The lower traveling body 200 is capable of self-propelling. In other words, the lower traveling body 200 is capable of traveling. The upper rotating body 300 is disposed above the lower traveling body 200. The upper rotating body 300 is capable of rotating with respect to the lower traveling body 200.

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

[0018] In detail, the track frame 220 has a center frame 222 and a pair of left and right side frames 224a, 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, 224b are each disposed on either side of the center frame 222 in the Y-axis direction (left and right direction). In other words, the center frame 222 is located between the side frames 224a, 224b. The side frames 224a, 224b are connected to the center frame 222.

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

[0020] The soil removal device 230 is provided in front of the lower traveling body 200. The soil removal device 230 is connected to the lower traveling body 200. The soil removal device 230 is used for removing soil and sand, and for leveling land such as developed land and roads.

[0021] As shown in FIG. 1(b), the earth removal device 230 has a blade 232 extending in the Y-axis direction (left-right direction). The blade 232 is grounded on the ground during earth removal work. As the construction machine 100 moves forward, earth and sand are removed by the blade 232. Similarly, the blade 232 is grounded on the ground during ground leveling work. As the construction machine 100 moves forward, the ground is leveled by the blade 232.

[0022] As shown in FIG. 1(a), the upper rotating body 300 includes a control unit 310 and a controller 320. The control unit 310 is disposed above the rotary connecting member 400 (FIG. 1(b)). A control seat is disposed in the control unit 310. Work operation levers, travel levers, an operation panel, etc. are disposed in the control seat. An operator sits in the control seat and can control the travel of the construction machine 100 and the operation of the work implement 330 by operating the work operation levers, etc.

[0023] Furthermore, the blade 232 can be operated, and the operator can operate the blade 232 by operating the work operation lever. More specifically, the blade 232 can perform lifting, tilting, and angle movements. The blade 232 is driven by the extension and contraction of various hydraulic cylinders provided in the blade removal device 230.

[0024] The lift operation is an operation in which the blade 232 moves in the up-down direction. The tilt operation is an operation in which the blade 232 rotates left and right about an axis of rotation parallel to the X-axis direction (front-back direction). The angle operation is an operation in which the blade 232 rotates left and right about an axis of rotation parallel to the Z-axis direction (up-down direction). The lift operation changes the vertical position of the blade 232. The tilt operation changes the angle of the blade 232 with respect to the ground. The angle operation changes the angle of the blade 232 with respect to the traveling direction. Therefore, the tilt operation and angle operation change the attitude of the blade 232.

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

[0026] Next, the work machine 330 will be described with reference to Fig. 1(a). As shown in Fig. 1(a), the work machine 330 is connected to the upper rotating body 300. The work machine 330 is disposed in front of the control section 310. The work machine 330 has 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 movable so as to be telescopic. 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 driven independently by the boom cylinder 332a, the arm cylinder 334a, and the bucket cylinder 336a. Driving the boom 332, the arm 334, and the bucket 336 enables excavation work of earth and sand, etc.

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

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

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

[0031] In addition to the control section 310 and the controller 320, the upper rotating body 300 is provided with a rotation motor for rotating the upper rotating body 300, multiple hydraulic pumps, motors for driving the multiple hydraulic pumps, etc. The multiple hydraulic pumps supply hydraulic pressure to each hydraulic actuator (the boom cylinder 332a, the arm cylinder 334a, the bucket cylinder 336a, the various hydraulic cylinders of the soil removal device 230, the rotation motor, etc.). A rotary connecting member 400 shown in FIG. 1(b) is used as an oil passage between the upper rotating body 300 and the lower traveling body 200.

[0032] Furthermore, a power feeder is disposed on the upper rotating body 300. A power feed port (not shown) is provided on the upper rotating body 300, and the commercial power source and the power feeder are electrically connected by connecting a power feed cable of a commercial power source (corresponding to an external power source) to this power feed port. The power feeder may be disposed on the lower traveling body 200.

[0033] Next, the construction machine 100 of this embodiment will be further described with reference to Fig. 1(b). 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 in the soil removal device 230. The angle sensor 244 is an example of a "sensor".

[0034] In this embodiment, the controller 320 shown in FIG. 1(a) has a blade control mode in which the blade 232 is controlled based on three-dimensional data of the ground surface to be worked on. The target prism 242 is used to detect the current position (three-dimensional coordinates) of the blade 232. The angle sensor 244 detects the tilt angle of the blade 232. The three-dimensional data is input to the controller 320 via an operation panel arranged in the cockpit. The controller 320 controls the vertical position of the blade 232 and the attitude, i.e., the angle (tilt angle), of the blade 232 based on the current position (three-dimensional coordinates) of the blade 232, the tilt angle of the blade 232, and the three-dimensional data.

[0035] Specifically, the blade 230 further includes a support 241 extending in the vertical direction. The support 241 is located on the rear side of the blade 232 and is connected to the blade 232. Specifically, the support 241 is erected on a stay attached to the rear side of the blade 232. The target prism 242 is disposed on the upper part of the support 241. The target prism 242 includes a 360° prism (omnidirectional prism), and can reflect light in a direction parallel to the incident light regardless of the direction from which light is incident. The target prism 242 is detachably attached to the support 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 that uses light, and acquires coordinate information (three-dimensional coordinates) of the target prism 242 in real time while tracking the target prism 242. In more detail, the total station measures the distance from the total station to the target prism 242 and the angle of the target prism 242 with respect to the vertical and horizontal directions 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 wirelessly communicating with the total station. For example, the wireless communication device is attached to a bracket erected behind the control unit 310. 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 controller 320 acquires (calculates) the current position (three-dimensional coordinates) of the blade 232.

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

[0039] The blade control mode can be used, for example, for leveling work. The construction machine 100 (controller 320) controls the operation of the blade 232 based on the current position (three-dimensional coordinates) of the blade 232, the current attitude (tilt angle) of the blade 232, and three-dimensional data of the ground surface to be worked on, to perform automatic leveling work. Specifically, the operation of the blade 232 is controlled according to the three-dimensional data of the ground surface to be worked on. As a result, the height and tilt angle of the blade 232 change according to the three-dimensional data of the ground surface to be worked on, and leveling work can be performed that is suited to the ground surface to be worked on.

[0040] Next, the construction machine 100 of this embodiment will be described with reference to Figures 1(b) and 2. Figure 2 is another perspective view showing the lower traveling body 200 and the rotary connecting member 400 included in the construction machine 100 of this embodiment. As shown in Figures 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. 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. 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 coupling member 400. Therefore, the target prism 242 and the angle sensor 244 are electrically connected to the rotary coupling member 400.

[0043] 2, the relay connector 260 includes a first connector 262 and a second connector 264. The first cable 252 is coupled to the first connector 262. The second cable 254 is coupled to the second connector 264. The first connector 262 and the second connector 264 are each electrically connected to the rotating coupling member 400.

[0044] Next, the construction machine 100 of this embodiment will be further described with reference to Fig. 2. 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 body 222c. The earth removal device 230 further includes 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 body 222c are provided on the lower traveling body 200. Specifically, the pair of left and right pivot bodies 222a, 222b and the cylinder support body 222c are connected to the front surface of the center frame 222 and protrude forward from the front surface of the center frame 222. In other words, the pair of left and right pivot bodies 222a, 222b and the cylinder support body 222c protrude from the center frame 222 of the lower traveling body 200 toward the blade 232.

[0046] The cylinder support 222c is located between the pair of left and right pivot bodies 222a, 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). Of the pair of left and right pivot bodies 222a, 222b, the pivot body 222a is located on the left side of the cylinder support 222c, and the pivot body 222b is located on the right side of the cylinder support 222c. Therefore, the pivot body 222a, the cylinder support 222c, and the pivot body 222a are arranged in this order in the Y-axis direction (left and right direction). More specifically, the pivot body 222a, the cylinder support 222c, and the pivot body 222a are arranged in this order from the left side to the right side.

[0047] The lift cylinder 234a, the tilt cylinder 234b, and the angle cylinder 234c are movable so as to be telescopic. 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 blade 232. In other words, the lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c operate the blade 232 relative to the lower traveling body 200.

[0048] More specifically, the lift cylinder 234a lifts the blade 232. Specifically, the lift cylinder 234a extends and retracts to lift the blade 232. That is, the blade 232 moves in the up-down direction.

[0049] The tilt cylinder 234b tilts the blade 232. Specifically, the tilt cylinder 234b expands and contracts to tilt the blade 232. That is, the blade 232 rotates left and right about a rotation axis parallel to the X-axis direction (front-rear direction).

[0050] The 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 move the left and right ends of the blade 232 in the front-rear direction, thereby angling the blade 232. Specifically, one angle cylinder 234c extends and the other angle cylinder 234c contracts, causing the blade 232 to rotate left and right around a rotation axis parallel to the Z-axis direction (up-down direction).

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

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

[0054] Next, the construction machine 100 of this embodiment will be further described with reference to Fig. 2. 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 this embodiment, the drive system cable 272 extends from between the pivot body 222b and the cylinder support body 222c. The drive system cable 272 includes a hydraulic hose for driving the blade 232. The vertical position of the blade 232 and the attitude (tilt angle and angle angle) of the blade 232 can be controlled by the hydraulic pressure flowing through the hydraulic hose of the drive system cable 272.

[0056] Specifically, the hydraulic hoses of the drive system cable 272 include hydraulic hoses that extend from the center frame 222 to the selector valve 238 and communicate with the selector valve 238, and hydraulic hoses that extend 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 and communicate 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 to 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 that form a pilot oil passage that supplies pilot pressure to switch the valve position of the switching valve and a pilot discharge oil passage. Therefore, by controlling the supply of pilot pressure, the oil flowing out of the selector valve 238 can be sent to any one of the lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c.

[0058] Next, the rotary connecting member 400 included in the construction machine 100 of this embodiment will be described with reference to Figures 3(a) and 3(b). Figure 3(a) is a perspective view showing the rotary connecting member 400. Figure 3(b) is a top view showing the rotary connecting member 400.

[0059] As shown in Fig. 3(a) and Fig. 3(b), the rotary connecting member 400 has 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 generally cylindrical shape. The shaft 414 is rotatably inserted into a through hole of the body 412. The shaft 414 is rotatable relative 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 running body 200 (FIG. 2). The shaft 414 rotates relative to the body 412 as the upper rotating body 300 rotates.

[0061] The shaft 414 has a plurality of vertical holes 414p and a communication hole 414q. The multiple vertical holes 414p and the communication hole 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. The multiple vertical holes 414p each extend vertically downward from the upper end of the shaft 414. The multiple vertical holes 414p are arranged around the central axis of the shaft 414.

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

[0063] A portion of the shaft 414 is inserted into a 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 relative to the stator 424. The terminal portion 426 is attached to the stator 424. In this embodiment, the terminal portion 426 protrudes from a 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 relative 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 the cable arranged in the communication hole 414q of the shaft 414. As a result, the cable arranged in the communication hole 414q of the shaft 414 is electrically connected to the terminal portion 426. For example, the cable arranged 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 relative to the body 412. For example, the connecting portion 430 includes 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 to each other.

[0067] Next, a further description will be given of the body 412. The body 412 has a body main portion 412a and a fixing portion 412b. The shaft 414 passes through the body main portion 412a.

[0068] The fixed portion 412b is located at the bottom of the body 412. The fixed portion 412b is fixed to the lower running structure 200 (FIG. 2). As a result, the body main body portion 412a is fixed to the lower running structure 200. The fixed portion 412b extends in the X-axis direction relative 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 this embodiment, the second anti-rotation portion 440 is attached to the fixed portion 412b of the swivel joint 410. The second anti-rotation portion 440 limits the rotation of the stator 424 of the slip ring 420. In other words, the second anti-rotation portion 440 limits the rotation of the terminal portion 426. In more detail, the second anti-rotation portion 440 limits the rotation of the stator 424 in conjunction with the rotation of the rotor 422 of the slip ring 420.

[0070] For example, the second anti-rotation portion 440 may come into contact with the terminal portion 426 to limit the rotation of the stator 424. Alternatively, the second anti-rotation portion 440 may come into contact with the stator 424 to limit the rotation of the stator 424. In this embodiment, the second anti-rotation portion 440 extends vertically downward from the fixed portion 412b and engages with the terminal portion 426. As a result, the terminal portion 426 (stator 424) is fixed to the body 412 of the swivel joint 410, and the rotation of the terminal portion 426 (stator 424) is limited.

[0071] Next, the rotating connecting member 400 included in the construction machine 100 of this embodiment will be described in detail with reference to Figures 3(a), 3(b), 4(a) and 4(b). Figure 4(a) is a side view showing the body 412 and the second anti-rotation portion 440 of the rotating connecting member 400. Figure 4(b) is a top view showing the body 412.

[0072] 4(a) and 4(b), the body 412 of the swivel joint 410 has a cylindrical shape. 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 Fig. 3(a) and Fig. 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 connects the inside and outside of the body 412. A plurality of first horizontal holes 412p are provided in the side of the body 412. The first horizontal holes 412p are used as oil passages. The first horizontal holes 412p are connected to oil passages on the lower running body 200 side.

[0074] Specifically, the first horizontal holes 412p correspond to the vertical holes 414p described with reference to Figures 3(a) and 3(b), and each of the first horizontal holes 412p communicates with a different vertical hole 414p. Each of the vertical holes 414p shown in Figures 3(a) and 3(b) extends to a position where it communicates 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 connecting member 400. Fig. 4(d) is a top view showing the shaft 414 and the first anti-rotation portion 414t.

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

[0077] Although omitted in Fig. 4(c) for the sake of simplicity, multiple O-rings are attached in a line in the vertical direction to the circumferential surface of the shaft 414. Adjacent O-rings seal (partition) the space between the circumferential surface of the shaft 414 and the inner circumferential surface of the body main body portion 412a, forming oil passages corresponding to each hydraulic actuator installed in the lower traveling body 200. The oil passages formed by the multiple O-rings each communicate with a different first horizontal hole 412p (Fig. 4(a)).

[0078] Next, the rotary connecting member 400 included in the construction machine 100 of this embodiment will be described with reference to Fig. 5. Fig. 5 is an exploded perspective view of the rotary connecting member 400.

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

[0080] 5, the rotor 422 has a main body portion 422a and a flange portion 422f. The flange portion 422f protrudes 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. The flange portion 422f is provided with a bolt hole 422q.

[0081] The coupling portion 430 is fixed to the flange portion 422f of the slip ring 420. In other words, the coupling portion 430 is fixed to the rotor 422. The outer edge of the coupling 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 in 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 via the through hole 430h of the connecting portion 430.

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

[0084] A recess 430p communicating with the through hole 430h is provided in the main surface 430b. The outer diameter of the recess 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 that passes through the recess 430p in the vertical direction, and a bolt hole 430t that extends vertically outside the recess 430p. The bolt hole 430s is provided in the bottom surface of the recess 430p of the connecting portion 430, and the bolt hole 430t is provided outside the recess 430p of the connecting portion 430.

[0085] A bolt hole 414s is provided in the shaft 414 of the swivel joint 410 corresponding to the bolt hole 430s of the connecting part 430, 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 part 430 is fixed to the shaft 414 of the swivel joint 410.

[0086] In addition, 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 together with the rotation of the upper rotating body 300, the coupling part 430 and the rotor 422 rotate.

[0088] Furthermore, a communication hole 430r is provided on the main surface 430b of the connecting portion 430. The communication hole 430r communicates the recess 430p of the connecting portion 430 with the outside of the connecting portion 430. The communication hole 430r can suppress damage to the slip ring 420 even if liquid such as rainwater or cleaning liquid penetrates into the inside of the rotary connecting member 400. In particular, the construction machine 100 can become extremely dirty during work, and the dirt on the construction machine 100 is often washed with high-pressure cleaning liquid, so that liquid can penetrate into the inside of the rotary connecting member 400. However, even if liquid penetrates into the inside of the rotary connecting member 400, the communication hole 430r of the connecting portion 430 can discharge the penetrated liquid to the outside of the rotary connecting member 400.

[0089] Next, the second anti-rotation portion 440 will be described with reference to FIG. 5. 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 almost equal to 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, the stator 424 and the terminal portion 426 can be prevented from rotating together with the rotor 422.

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

[0091] 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 in the center of the center frame 222 and opens in a circular shape at the top of the center frame 222. The support portion 222s is disposed inside the center frame 222. When the center frame 222 is viewed from above, the support portion 222s overlaps with the through hole 222p.

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

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

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

[0095] As described with reference to Figs. 3(a), 3(b), 4(a) to 4(d) and 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 a "second electric wire." Note that the cable 340 may be a cable arranged in the upper rotating body 300, or may be a cable dedicated to the rotary connecting member 400.

[0096] The cable 340 rotates together with the rotation of the upper rotating 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 rotating body 300. Therefore, even if the cable 340 rotates together with the rotation of the upper rotating body 300, the cable 340 is not cut.

[0097] Next, the lower traveling structure 200 included in the construction machine 100 of this embodiment will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a perspective view showing the lower traveling structure 200 included in the construction machine 100 of this embodiment. Specifically, Fig. 7 shows the lower traveling structure 200 seen from diagonally below. Fig. 8 is a front view showing the lower traveling structure 200 included in the construction machine 100 of this embodiment. Specifically, Fig. 8 shows the lower traveling structure 200 seen from the front.

[0098] 7 and 8, the construction machine 100 further includes a cover member 280. The cover member 280 is provided on the underside 221a of the lower running structure 200. More specifically, the center frame 222 has a bottom plate 221, and the cover member 280 is disposed on the underside of the bottom plate 221 of the center frame 222. The underside of the bottom plate 221 of the center frame 222 constitutes the underside 221a of the lower running structure 200.

[0099] In this embodiment, the cover member 280 has a first cover member 281 and a second cover member 282. The first cover member 281 is located in the center of the center frame 222 in the X-axis direction (front-rear direction) as shown in Fig. 7, and extends in the Y-axis direction (left-right direction) as shown in Fig. 8. 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. In particular, the second cover member 282 extends to below the relay connector 260.

[0100] Next, the lower traveling body 200 included in the construction machine 100 of this embodiment will be further described with reference to Figures 7 and 8. As shown in Figures 7 and 8, the cylinder support body 222c protrudes from a front surface 223a (Figure 8) of the lower traveling body 200. The front surface 223a is an example of a "side surface." In more detail, as shown in Figure 8, the center frame 222 has a front plate 223, and the cylinder support body 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] The relay connector 260 is located in front of the front surface 223a of the lower running body 200. In other words, the relay connector 260 is located in front of the front plate 223 of the center frame 222.

[0102] Next, the lower traveling structure 200 included in the construction machine 100 of this embodiment will be described with reference to Fig. 9. Fig. 9 is an enlarged front view showing a portion of the lower traveling structure 200. However, in Fig. 9, the cover member 280 is not shown in order to facilitate understanding.

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

[0104] According to this 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 protruded from the lower surface 221a (the lower surface of the center frame 222) of the lower traveling body 200. As a result, the height of the driver's seat can be prevented from increasing.

[0105] Specifically, when the slip ring 420 is connected to the swivel joint 410, the driver's seat may become higher by the height of the slip ring 420. In contrast, in this embodiment, a part of the slip ring 420 is protruded from the lower surface 221a (the lower surface of the center frame 222) of the lower traveling body 200, so that the driver's seat can be prevented from becoming higher by the height of the slip ring 420. Therefore, the position of the center of gravity of the construction machine 100 is unlikely to become higher, and the stability of the construction machine 100 is unlikely to decrease. Since the stability of the construction machine 100 is not likely to decrease, the ride comfort is also unlikely to decrease. Furthermore, since the driver's seat is not high, it is easy for the operator to get into the driver's seat.

[0106] Next, the lower carrier 200 included in the construction machine 100 of this embodiment will be described with reference to Figures 7 to 10. Figure 10 is another front view showing an enlarged view of a portion of the lower carrier 200.

[0107] 7 to 10, the cover member 280 covers a portion of the slip ring 420 that protrudes from the lower surface 221a (lower surface of the center frame 222) of the lower running body 200. In detail, the first cover member 281 covers a portion of the slip ring 420 that protrudes from the lower surface 221a (lower surface of the center frame 222) of the lower running body 200. In this embodiment, the first cover member 281 covers the stator 424 of the slip ring 420.

[0108] According to this embodiment, the cover member 280 covers the portion (stator 424) of the slip ring 420 that protrudes from the lower surface 221a (lower surface of the center frame 222) of the lower running body 200, so that foreign objects such as soil and sand flying from below the lower running body 200 toward the lower surface 221a (lower surface of the center frame 222) of the lower running body 200 while the construction machine 100 is traveling can be prevented from colliding with the slip ring 420 (stator 424). This makes it possible to prevent the slip ring 420 from being damaged.

[0109] Next, the lower traveling body 200 included in the construction machine 100 of this embodiment will be further described with reference to FIG. 10. As shown in FIG. 10, in this embodiment, the lower surface of the first cover member 281 is located above the lowermost part 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 first cover member 281, the lowermost part 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 under the lower traveling body 200 during the traveling of the construction machine 100.

[0110] Next, the lower traveling structure 200 included in the construction machine 100 of this embodiment will be described with reference to Fig. 11. Fig. 11 is a bottom view showing a part of the lower traveling structure 200 and the rotary connecting member 400. However, for ease of understanding, the cover member 280 (the first cover member 281 and the second cover member 282) is omitted in Fig. 10.

[0111] As shown in FIG. 11, the construction machine 100 further includes a cable 256. The cable 256 is arranged on the lower traveling body 200. The cable 256 is electrically connected to the stator 424 of the slip ring 420. More 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 (the stator 424) to the relay connector 260 and is connected to the relay connector 260. More 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 (the stator 424) via the cable 256. Therefore, 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, which have been described with reference to Fig. 1(b) and Fig. 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)). In addition, 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 manner, the rotary connecting member 400 electrically connects the cable (cable 340) on the upper rotating body 300 side extending from the upper rotating body 300 to the lower running body 200, and the cable (cable 256) arranged on the lower running body 200. This makes it possible to prevent the cable (cable 256) arranged on the lower running body 200 from being damaged due to the rotational movement of the upper rotating body 300.

[0115] Here, the controller 320 will be described. When multiple construction machines 100 are working 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 the target prism 242 attached to the machine itself. In this embodiment, the controller 320 transmits and receives authentication signals to and from the target prism 242 so that it can communicate only with specific total stations during blade control mode.

[0116] Specifically, authentication signals are 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] Furthermore, 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. In detail, the controller 320 generates a first driving power for driving the target prism 242 from the power supplied to the power feeder, and supplies the first driving power 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] Additionally, during the blade control mode, the controller 320 provides power to the angle sensor 244 and receives a signal indicative of the tilt angle from the angle sensor 244.

[0119] In detail, the controller 320 generates a second driving power for driving the angle sensor 244 from the power supplied to the power supply device, and supplies the second driving power to the angle sensor 244. Specifically, the second driving 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)). Also, a 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] Next, the construction machine 100 of this embodiment will be further described with reference to FIG. 11. As shown in FIG. 11, the cable 256 is routed outside the lower traveling body 200. This makes it easy to route the cable 256. More 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 the cable 256 in a narrow gap between the hydraulic piping and hydraulic equipment, which makes it difficult to arrange the cable 256. In contrast, according to this embodiment, the cable 256 can be arranged outside the lower traveling body 200, which makes it easy to arrange the cable 256.

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

[0122] Next, the lower track structure 200 included in the construction machine 100 of this embodiment will be described with reference to Figures 10 to 12. Figure 12 is another bottom view showing a part of the lower track structure 200 and the rotary connecting member 400.

[0123] As shown in FIGS. 11 and 12, the second cover member 282 extends from the side (left) of the terminal portion 426 of the slip ring 420 (the 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 objects such as soil 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 while the construction machine 100 is traveling from colliding with the cable 256. Therefore, it is possible to prevent the cable 256 from being damaged.

[0125] 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 have to cover the second cover member 282.

[0126] Next, the second cover member 282 will be described with reference to Fig. 10. As shown in Fig. 10, in this embodiment, the lower surface of the second cover member 282 is located above the lowermost part 222cb of the cylinder support 222c. Therefore, before an obstacle passing under the lower running body 200 during the travel of the construction machine 100 collides with the second cover member 282, the lowermost part 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, the cable 256 can be prevented from being damaged by an obstacle passing under the lower running body 200 during the travel of the construction machine 100.

[0127] Next, the lower carrier 200 included in the construction machine 100 of this embodiment will be described with reference to Fig. 13. Fig. 13 is a schematic cross-sectional view showing a portion of the lower carrier 200.

[0128] 13, the front surface 223a of the lower running body 200 (the front surface of the center frame 222) faces the relay connector 260. More specifically, the relay connector 260 is disposed away from the front surface 223a of the lower running body 200. The cable 256 has a first bent portion 256a and a second bent portion 256b. The second bent portion 256b is located above the first bent portion 256a.

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

[0130] According to this embodiment, the cable 256 bends toward the front surface 223a of the lower running body 200, and then bends toward the relay connector 260, so that the relay connector 260 can be brought closer to the front surface 223a of the lower running body 200. For example, compared to a configuration in which the cable 256 stands up between the relay connector 260 and the front surface 223a of the lower running 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 running body 200 by the amount that the cable 256 bends toward the front surface 223a of the lower running body 200.

[0131] In this way, by bringing the relay connector 260 closer to the front surface 223a of the lower running body 200, the relay connector 260 is less likely to come into contact with obstacles, etc. Therefore, damage to the relay connector 260 can be suppressed.

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

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

[0134] 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 running body 200. As a result, the cable 256 can be disposed outside the lower running body 200. Furthermore, according to this embodiment, the relay connector 260 can be supported by utilizing the second cover member 282. Therefore, the number of parts of the construction machine 100 can be reduced, and resources can be saved. Note that, although the second cover member 282 is utilized to support the relay connector 260 in this embodiment, a dedicated part for supporting the relay connector 260 may be provided on the lower running body 200.

[0136] Furthermore, according to this embodiment, the portion of the cable 256 that is exposed between the lower running body 200 and the relay connector 260 can be covered by the protruding portion 282a of the second cover member 282. This makes it possible to prevent foreign objects such as soil and sand that fly from below the lower running body 200 while the construction machine 100 is traveling from colliding with the portion of the cable 256 that is exposed between the lower running body 200 and the relay connector 260.

[0137] Next, the lower traveling body 200 included in the construction machine 100 of this embodiment will be described with reference to Figures 14 and 15. Figure 15 is an enlarged perspective view of a portion of the lower traveling body 200. In detail, Figure 15 shows the relay connector 260 and its vicinity. In Figures 14 and 15, the covers 260a, 260b are shown exploded for ease of understanding.

[0138] 14 and 15, the relay connector 260 further includes a pair of upper and lower covers 260a, 260b. The cover 260a is located above the cover 260b. The pair of upper and lower covers 260a, 260b have notched portions cut out to fit into 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, 260b are each fixed to the connector support portion 283 by, for example, a bolt.

[0139] The above describes embodiments of the present invention with reference to the drawings (FIGS. 1(a) to 15). However, the present invention is not limited to the above embodiments, and can be embodied in various aspects without departing from the gist of the present invention. Furthermore, the components disclosed in the above embodiments can be modified as appropriate. For example, a component among all the components shown in one embodiment may be added to a component of another embodiment, or some of all the components shown in one embodiment may be deleted from the embodiment.

[0140] The drawings are mainly schematic illustrations of each component to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. Furthermore, the configurations of each component shown in the above embodiment are merely examples and are not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present invention.

[0141] For example, in the embodiment described with reference to Figures 1(a) to 15, the tilt angle of the blade 232 is detected by the angle sensor 244, but the construction machine 100 may further be equipped with an angle sensor that detects the angle of the blade 232, in addition to the angle sensor 244.

[0142] 1(a) to 15, the selector valve 238 has a pilot-type changeover valve, but the selector valve 238 may have a solenoid valve instead of the pilot-type changeover valve. In this case, a cable for transmitting a changeover signal for switching the valve position of the solenoid valve is provided instead of a hydraulic hose for supplying pilot pressure.

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

[0144] 1(a) to 15, the cable 256 is routed below the lower surface 221a of the lower running body 200, but the cable 256 may be routed outside the lower running body 200. For example, the cable 256 may extend upward from the terminal portion 426 at the lower end of the rotating connecting member 400, extend from the upper surface of the lower running body 200, and then be routed above the upper surface of the lower running body 200.

[0145] 1(a) to 15, a portion of the slip ring 420 protrudes from the lower surface 221a of the lower running body 200, but a portion of the slip ring 420 may protrude from the upper surface of the lower running body 200. In this case, the cable 256 is routed above the upper surface of the lower running body 200. Alternatively, the cable 256 may extend downward from the terminal portion 426 at the upper end of the rotary connecting member 400, extend from the lower surface 221a of the lower running body 200, and then be routed below the lower surface 221a of the lower running body 200.

[0146] 1(a) to 15, a part of the slip ring 420 protrudes from the lower surface 221a of the lower running body 200, but the entire slip ring 420 may be disposed inside the lower running body 200. In this case, the cable 256 may be routed outside the lower running body 200 after being extended from inside the lower running body 200 to the outside.

[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 running body 200 to the outside of the lower running 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 running body 200 to the outside of the lower running body 200. [Industrial Applicability]

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

[0149] 100: Construction machinery 200: Lower running body 221a: Bottom surface 222c: Cylinder support 222cb: Bottom 230:Earth removal equipment 232: Earth removal plate 234a : Lift cylinder 244: Angle sensor 254: Second cable 256: Cable 256a: 1st bending part 256b: 2nd bending part 260: Relay connector 264: Second connector 280: Cover member 281: First cover member 282: Second cover member 282a: Overhang 283: Connector support part 300: Upper rotating body 340: Cable 420: Slip ring 422: Rotor 424: Stator 426:Terminal section

Claims

1. A lower traveling body capable of traveling; an upper rotating body disposed above the lower traveling body and capable of rotating with respect to the lower traveling body; A slip ring having a stator and a rotor electrically connected to each other and disposed on the lower running body; A first electric wire disposed on the lower traveling body and electrically connected to the stator; A second electric wire extending from the upper rotating body to the rotor and electrically connecting to the rotor; Equipped with The rotor is rotatable relative to the stator, The rotor rotates together with the rotation of the upper rotating body, A construction machine, wherein the stator protrudes downward from the underside of the lower running body together with a rotation stopper portion that limits rotation of the stator.

2. The stator has a terminal portion on a side surface, The construction machine according to claim 1 , wherein the anti-rotation portion restricts rotation of the stator by engaging with the terminal portion.

3. The construction machine according to claim 1 or 2, wherein the first electric wire is routed outside the lower traveling body.

4. The construction machine according to claim 1 , wherein the first electric wire is routed below a lower surface of the lower traveling body.

5. A lower traveling body capable of traveling; an upper rotating body disposed above the lower traveling body and capable of rotating with respect to the lower traveling body; A slip ring having a stator and a rotor electrically connected to each other and disposed on the lower running body; A first electric wire disposed on the lower traveling body and electrically connected to the stator; A second electric wire extending from the upper rotating body to the rotor and electrically connecting to the rotor; Equipped with The rotor is rotatable relative to the stator, The rotor rotates together with the rotation of the upper rotating body, A portion of the slip ring protrudes downward from a lower surface of the lower running body, A soil removal device having a blade; A sensor provided in the soil removal device; A connector that is connected to the first electric wire; a third wire electrically connected to the sensor, extending from the sensor to the connector, and connecting to the connector; Further comprising: The connector electrically connects the first electric wire and the third electric wire, the lower running body has a side surface facing the connector, The first electric wire rises between the connector and the side surface, bends toward the side surface, then bends toward the connector, and extends to the connector.

6. a cover member provided on a lower surface of the lower traveling body to cover the portion of the slip ring and the first electric wire; a cylinder support body protruding from the lower traveling body toward the blade; Further comprising: The blade drive device includes a cylinder for driving the blade. The cylinder support supports the cylinder, The construction machine according to claim 5 , wherein a lower surface of the cover member is located above a lowermost portion of the cylinder support body.

7. The cover member is a protruding portion protruding from the lower traveling body toward the connector; a connector support portion fixed to the protruding portion and supporting the connector; The construction machine according to claim 6 .

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