JP2023130791A - Construction machine - Google Patents

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

The present invention relates to construction machinery.

2. Description of the Related Art Construction machines are known that include 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, as such a construction machine, a wheel shovel that includes a self-propelled traveling body and a revolving body that can turn relative to the traveling body.

The wheel shovel of Patent Document 1 further includes a swivel joint that enables supply of pressure oil from the rotating body side to the traveling body side. The swivel joint includes a housing that is fixed to the traveling body, and a spindle that is housed within the housing and rotates as the rotating body turns. A rotation preventing member is attached to the upper part of the spindle (the end on the rotating body side). The revolving body is provided with a stopper that restricts rotation of the detent member. The stopper restricts the rotation of the rotation preventing member, so that the spindle rotates as the rotating body turns.

The wheel excavator of Patent Document 1 further includes a slip ring. The slip ring is fixed to a detent 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 rotating body side) of the swivel joint.

Japanese Patent Application Publication No. 2014-095183

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 center of gravity of the construction machine becomes higher, which may reduce the stability of the construction machine. Furthermore, when the stability of construction machinery decreases, the riding comfort also decreases. Furthermore, since the driver's seat is raised, it may be difficult for the operator to get into the driver's seat.

The present invention has been made in view of the above problems, and an object thereof is to provide a construction machine that can suppress the height of the driver's seat.

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 undercarriage body is movable. The upper rotating body is arranged above the lower traveling body. The upper rotating body is rotatable relative to the lower traveling body. The slip ring has a stator and a rotor that are electrically connected. The slip ring is arranged on the undercarriage. The first electric wire is arranged on the undercarriage. The first electric wire is electrically connected to the stator. The second electric wire extends from the upper revolving body to the rotor and is electrically connected to the rotor. 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 undercarriage.

According to the construction machine according to the present invention, it is possible to suppress the height of the driver's seat.

(a) is a perspective view showing a construction machine according to an embodiment of the present invention. (b) is a perspective view showing an undercarriage and a rotary connection member included in the construction machine according to the embodiment of the present invention. FIG. 3 is another perspective view showing an undercarriage and a rotary connection member included in the construction machine according to the embodiment of the present invention. (a) is a perspective view showing a rotational connection member. (b) is a top view showing the rotational connection member. (a) is a side view showing the body of the rotational connection member and the second rotation stopper. (b) is a top view showing the body. (c) is a side view showing the shaft, slip ring, and connection part of the rotational connection member. (d) is a top view showing the shaft. FIG. 3 is an exploded perspective view of the rotating connection member. FIG. 3 is a perspective view showing the rotating coupling member and its vicinity. 1 is a perspective view showing an undercarriage included in a construction machine according to an embodiment of the present invention. 1 is a front view showing an undercarriage body included in a construction machine according to an embodiment of the present invention. It is a front view which expands and shows a part of undercarriage body. It is another front view which expands and shows a part of undercarriage body. It is a bottom view showing a part of an undercarriage body and a rotating connection member. FIG. 7 is another bottom view showing a portion of the undercarriage and the rotational connection member. It is a typical sectional view showing a part of lower traveling body. It is a front view showing a 2nd cover member and a relay connector. It is a perspective view which expands and shows a part of undercarriage body.

Embodiments of the construction machine of the present invention will be described below 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 forms without departing from the spirit thereof. Note that the description may be omitted as appropriate for parts where the description overlaps. Further, in the figures, the same or corresponding parts are given the same reference numerals and the description will not be repeated.

In this specification, in order to facilitate understanding, an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other may be described. Typically, the X-axis indicates the traveling direction of the undercarriage 200 (FIG. 1(a)), and the Z-axis indicates the vertical direction. The Y-axis indicates a direction perpendicular to the traveling direction and the vertical direction of the undercarriage body 200. However, the X-axis, Y-axis, and Z-axis are not limited to these directions.

Furthermore, in this specification, in order to facilitate understanding, "front", "rear", "upper", "lower", "left", and "right" may be described as appropriate. In this embodiment, the side on which 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 "back side". . Further, the side on which 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". Further, the side on which the crawler type traveling part 212a (FIG. 1(a)) is arranged with respect to the crawler type traveling part 212b (FIG. 1(a)) is the "left side", and the opposite side is the "right side". In other words, the left side when looking from the rear side to the front side is the "left side", and the right side when looking from the rear side to the front side is the "right side". However, for convenience of explanation, "front", "rear", "top", "bottom", "left" and "right" are only defined, and by definition of these directions, the construction machine of the present invention There is no intention to limit the orientation when using or assembling.

First, the construction machine 100 of this embodiment will be described with reference to FIGS. 1(a) and 1(b). Here, a hydraulic excavator will be described as an example of the construction machine 100. However, construction machine 100 is not limited to a hydraulic excavator, and may be an electric excavator. Alternatively, construction machine 100 may be another construction machine.

FIG. 1(a) is a perspective view showing a construction machine 100 of this embodiment. FIG. 1(b) is a perspective view showing the lower traveling body 200 and the rotary connection member 400 included in the construction machine 100 of this embodiment.

As shown in FIGS. 1(a) and 1(b), the construction machine 100 includes a lower traveling body 200, an earth removal device 230, an upper revolving body 300, a working machine 330, and a rotating connection member 400. Be prepared. The undercarriage body 200 is self-propelled. In other words, the lower traveling body 200 is movable. The upper revolving body 300 is arranged above the lower traveling body 200. The upper revolving body 300 is rotatable relative to the lower traveling body 200.

As shown in FIGS. 1A and 1B, the lower traveling body 200 includes a pair of left and right crawler traveling sections 212a and 212b, and a track frame 220. By driving the crawler type traveling parts 212a and 212b, the lower traveling body 200 moves forward or backward. As a result, the construction machine 100 moves forward or backward. The track frame 220 supports the crawler-type running sections 212a and 212b and the rotational connection member 400. Specifically, the crawler type traveling parts 212a, 212b and the rotational connection member 400 are attached to the track frame 220. Therefore, the rotational connection member 400 is disposed on the undercarriage 200.

Specifically, the truck frame 220 includes 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-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-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.

The crawler type traveling parts 212a, 212b are attached to side frames 224a, 224b. Therefore, the center frame 222 is arranged between the crawler type running section 212a and the crawler type running section 212b. Rotating connection member 400 is attached to center frame 222. Specifically, the rotational connection member 400 is arranged at the center of the center frame 222 in the Y-axis direction (left-right direction).

The earth removal device 230 is provided in front of the lower traveling body 200. The earth removal device 230 is connected to the lower traveling body 200. The earth removal device 230 is used for earth removal work such as earth and sand, and land leveling work such as land development and roads.

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

As shown in FIG. 1(a), the revolving superstructure 300 includes a steering section 310 and a controller 320. The steering section 310 is arranged above the rotational connection member 400 (FIG. 1(b)). A pilot seat is arranged in the pilot section 310. A work control lever, a travel lever, a control panel, etc. are arranged in the cockpit. The operator can control the traveling of the construction machine 100 and the operation of the work machine 330 by sitting in the cockpit and operating work control levers and the like.

Furthermore, the earth removal plate 232 can be operated, and the operator can operate the earth removal plate 232 by operating a work operation lever. Specifically, the earth removal plate 232 is capable of lifting, tilting, and angle movements. The earth removal plate 232 is driven by the expansion and contraction of various hydraulic cylinders provided in the earth removal device 230.

The lift operation is an operation in which the earth removal plate 232 moves in the vertical direction. The tilt operation is an operation in which the earth removal plate 232 rotates left and right around a rotation axis parallel to the X-axis direction (front-back direction). The angle operation is an operation in which the earth removal plate 232 rotates left and right around a rotation axis parallel to the Z-axis direction (vertical direction). Due to the lift operation, the vertical position of the earth removal plate 232 changes. Due to the tilt operation, the angle of the earth removal plate 232 with respect to the ground changes. The angle movement changes the angle of the earth removal plate 232 with respect to the direction of movement. Therefore, the posture of the earth removal plate 232 changes due to the tilting operation and the angle operation.

As shown in FIG. 1(a), the controller 320 is arranged at the rear of the control section 310. Controller 320 controls each member of construction machine 100.

Next, the working machine 330 will be explained with reference to FIG. 1(a). As shown in FIG. 1(a), the working machine 330 is connected to the upper revolving structure 300. Work machine 330 is arranged in front of control section 310. The work 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.

The boom cylinder 332a, the arm cylinder 334a, and the bucket cylinder 336a are telescopically movable. Boom cylinder 332a, arm cylinder 334a, and bucket cylinder 336a are hydraulic cylinders. Boom 332, arm 334, and bucket 336 can be independently driven by boom cylinder 332a, arm cylinder 334a, and bucket cylinder 336a. By driving the boom 332, arm 334, and bucket 336, excavation work such as earth and sand becomes possible.

Specifically, the base end of the boom 332 is rotatably supported by a first rotating shaft provided at the front of the upper revolving structure 300. The first rotation axis extends in the horizontal direction (Y-axis direction). The boom 332 rotates about the first rotation axis as the boom cylinder 332a expands and contracts.

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

The bucket 336 is rotatably supported by a third rotating shaft provided at the tip of the arm 334. The third rotation axis extends in the horizontal direction (Y-axis direction). The bucket 336 rotates about the third rotation axis as the bucket cylinder 336a expands and contracts.

In addition to the operating unit 310 and the controller 320, the revolving upper structure 300 includes a swing motor that rotates the revolving upper structure 300, a plurality of hydraulic pumps, a motor that drives the plurality of hydraulic pumps, and the like. A 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 removal device 230, swing motor, etc.). The rotary connection member 400 shown in FIG. 1(b) is used as an oil passage between the upper revolving structure 300 and the lower traveling structure 200.

Furthermore, a power supply device is arranged in the upper revolving body 300. The upper revolving body 300 is provided with a power supply port (not shown), and by connecting a power supply cable of a commercial power source (equivalent to an external power source) to this power supply port, the commercial power source and the power supply device are electrically connected. be done. Note that the power supply device may be arranged on the lower traveling body 200.

Next, the construction machine 100 of this embodiment will be further explained 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. A target prism 242 and an angle sensor 244 are provided on the earth removal device 230. The angle sensor 244 is an example of a "sensor".

In this embodiment, the controller 320 shown in FIG. 1(a) has an earth removal plate control mode, which is a mode in which the earth removal plate 232 is controlled based on three-dimensional data of the ground to be worked on. The target prism 242 is used to detect the current position (three-dimensional coordinates) of the earth removal plate 232. Angle sensor 244 detects the tilt angle of soil removal plate 232. The three-dimensional data is input to the controller 320 via an operation panel located in the cockpit. The controller 320 determines the vertical position of the earth removal plate 232 and the attitude of the earth removal plate 232 based on the current position (three-dimensional coordinates) of the earth removal plate 232, the tilt angle of the earth removal plate 232, and three-dimensional data. That is, the angle (tilt angle) is controlled.

Specifically, the earth removal device 230 further includes a column 241 extending in the vertical direction. The support column 241 is located on the back side of the earth removal plate 232 and is connected to the earth removal plate 232. Specifically, the support column 241 is erected on a stay attached to the back surface of the earth removal plate 232. Target prism 242 is placed on top of column 241 . The target prism 242 has a 360° prism (omnidirectional prism), and can reflect light in a direction parallel to the incident light no matter which direction the light is incident on it. Note that the target prism 242 is detachably attached to the support column 241.

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. do. Specifically, 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, coordinate information (three-dimensional coordinates) of the target prism 242 is acquired (calculated) from the measured data.

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 section 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 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 earth removal plate 232 is acquired (calculated).

The angle sensor 244 is installed on the back side of the earth removal plate 232. The angle sensor 244 transmits a signal indicating the current attitude or angle (tilt angle) of the earth removal plate 232 to the controller 320. As a result, information indicating the current attitude or angle (tilt angle) of the earth removal plate 232 is input to the controller 320.

The earth removal plate control mode can be used, for example, for leveling work. The construction machine 100 (controller 320) moves the earth removal plate based on the current position (three-dimensional coordinates) of the earth removal plate 232, the current attitude (tilt angle) of the earth removal plate 232, and three-dimensional data of the ground to be worked on. The automatic leveling work is performed by controlling the operation of 232. Specifically, the operation of the earth removal plate 232 is controlled according to three-dimensional data of the ground to be worked on. As a result, the height and tilt angle of the soil removal plate 232 change according to the three-dimensional data of the ground to be worked on, and it is possible to perform leveling work that is suitable for the ground to be worked on.

Next, the construction machine 100 of this embodiment will be explained with reference to FIG. 1(b) and FIG. 2. FIG. 2 is another perspective view showing the lower traveling body 200 and the rotary connection member 400 included in the construction machine 100 of this embodiment. As shown in FIG. 1(b) and FIG. 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 undercarriage 200.

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 electrically connects with 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."

Relay connector 260 is arranged in front of center frame 222. Relay connector 260 is electrically connected to rotational connection member 400 . Therefore, the target prism 242 and the angle sensor 244 are electrically connected to the rotational coupling member 400.

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

Next, with reference to FIG. 2, the construction machine 100 of this 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 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.

The pair of left and right pivot bodies 222a and 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 and 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. That is, 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 earth removal plate 232.

The cylinder support body 222c is located between the pair of left and right pivot bodies 222a and 222b. Specifically, the cylinder support body 222c is located at the center of the center frame 222 in the Y-axis direction (left-right direction). Of the pair of left and right pivot connections 222a and 222b, the pivot connection 222a is located on the left side of the cylinder support body 222c, and the pivot connection body 222b is located on the right side of the cylinder support body 222c. Therefore, the pivot assembly 222a, the cylinder support body 222c, and the pivot assembly 222a are arranged in this order in the Y-axis direction (left-right direction). Specifically, the pivot assembly 222a, the cylinder support 222c, and the pivot assembly 222a are arranged in this order from the left side to the right side.

The lift cylinder 234a, the tilt cylinder 234b, and the angle cylinder 234c are telescopically movable. Lift cylinder 234a, tilt cylinder 234b, and angle cylinder 234c are hydraulic cylinders. A lift cylinder 234a, a tilt cylinder 234b, and a pair of left and right angle cylinders 234c drive the earth removal plate 232. In other words, the lift cylinder 234a, the tilt cylinder 234b, and the pair of left and right angle cylinders 234c operate the earth removal plate 232 with respect to the lower traveling body 200.

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

The tilt cylinder 234b tilts the earth removal plate 232. Specifically, as the tilt cylinder 234b expands and contracts, the earth removal plate 232 tilts. That is, the earth removal plate 232 rotates left and right about a rotation axis parallel to the X-axis direction (front-back direction).

A pair of left and right angle cylinders 234c are located on both left and right sides of the lift cylinder 234a. The left and right pair of angle cylinders 234c move the left and right ends of the soil removal plate 232 in the front-rear direction, thereby causing the soil removal plate 232 to move at an angle. Specifically, one angle cylinder 234c extends and the other angle cylinder 234c contracts, so that the earth removal plate 232 rotates left and right about a rotation axis parallel to the Z-axis direction (vertical direction).

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

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 portion (the end portion on the center frame 222 side) of the arm member to which the left angle cylinder 234c is attached, so as to be freely rotatable in the vertical direction. Similarly, the pivot assembly 222b supports the base end (end on the center frame 222 side) of the arm member to which the right angle cylinder 234c is attached, so as to be freely rotatable in the vertical direction.

Note that, as shown in FIG. 2, the relay connector 260 is arranged between the pivot body 222a and the cylinder support body 222c.

Next, with reference to FIG. 2, the construction machine 100 of this 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.

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 joint 222b and the cylinder support 222c. Drive system cable 272 includes a hydraulic hose for driving soil removal plate 232. The vertical position of the soil removal plate 232 and the attitude (tilt angle and angle angle) of the soil removal plate 232 can be controlled by the hydraulic pressure flowing through the hydraulic hose of the drive system cable 272.

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 selector valve 238, and from the selector valve 238 to the lift cylinder 234a, the tilt cylinder 234b, and the left angle. It includes hydraulic hoses that extend to the cylinder 234c, or the right angle cylinder 234c, respectively, and communicate with the lift cylinder 234a, the tilt cylinder 234b, the left angle cylinder 234c, or the right angle cylinder 234c, respectively.

The selector valve 238 switches the flow of hydraulic pressure toward 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 has two cables that constitute a pilot oil passage that supplies pilot pressure to switch the valve position of the switching valve and a pilot discharge oil passage. Including hydraulic hoses. Therefore, by controlling the supply of 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.

Next, the rotary coupling member 400 included in the construction machine 100 of this embodiment will be explained with reference to FIGS. 3(a) and 3(b). FIG. 3(a) is a perspective view showing the rotational connection member 400. FIG. 3(b) is a top view showing the rotational connection member 400.

As shown in FIGS. 3(a) and 3(b), the rotational connection member 400 includes a swivel joint 410, a first rotation stopper 414t, a slip ring 420, a connection portion 430, and a second rotation stopper. 440. Swivel joint 410 extends in the vertical direction. Slip ring 420 is attached to the lower end of swivel joint 410. Specifically, the connecting part 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.

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. Shaft 414 is rotatable relative to body 412. A shaft 414 inserted into the body 412 can rotate around a central axis parallel to the Z-axis. The body 412 is fixed to the undercarriage 200 (FIG. 2). The shaft 414 rotates relative to the body 412 as the upper rotating body 300 rotates.

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

The plurality of vertical holes 414p function as oil passages. The vertical hole 414p has a cylindrical shape. Typically, the diameters of the plurality of vertical holes 414p are equal to each other. The communication hole 414q functions as a wiring route. For example, a cable for signal transmission or power supply is inserted into the communication hole 414q. The communication hole 414q has a cylindrical shape. Note that here, the diameter (for example, the length in the X direction) of the communication hole 414q is larger than the diameter (for example, the length in the X direction) of the vertical hole 414p.

A portion 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 rotation stopper 414t is fixed to the upper part of the shaft 414. The first detent portion 414t protrudes radially outward from the shaft 414. The first detent portion 414t engages with the upper rotating body 300 (FIG. 1(a)). Therefore, the shaft 414 rotates as the upper rotating body 300 turns.

Slip ring 420 includes a rotor 422 and a stator 424 that are electrically connected. Slip ring 420 further includes a terminal portion 426. The rotor 422 is rotatable relative to the stator 424. Terminal portion 426 is attached to stator 424 . In this embodiment, the terminal portion 426 protrudes from the side surface of the stator 424. Stator 424 electrically connects rotor 422 and terminal portion 426. For example, the rotor 422 has a ring portion, the stator 424 has a brush portion that slides on the ring portion, the ring portion and the brush portion are electrically connected, and the brush portion is connected to the terminal portion 426. It may be electrically connected.

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

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. Connecting portion 430 rotates with shaft 414 relative to body 412 . For example, the connecting portion 430 includes a seat 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.

Next, the body 412 will be further explained. The body 412 has a body main portion 412a and a fixing portion 412b. The shaft 414 passes through the main body portion 412a.

The fixing part 412b is located at the bottom of the body 412. The fixed portion 412b is fixed to the lower traveling body 200 (FIG. 2). As a result, the 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 portion 412a.

The second rotation stopper 440 is attached to the body 412 of the swivel joint 410. In this embodiment, the second detent portion 440 is attached to the fixed portion 412b of the swivel joint 410. The second rotation stopper 440 limits rotation of the stator 424 of the slip ring 420 . In other words, the second rotation preventing portion 440 restricts the rotation of the terminal portion 426. Specifically, the second rotation stopper 440 restricts the rotation of the stator 424 as the rotor 422 of the slip ring 420 rotates.

For example, the second rotation preventing portion 440 may limit rotation of the stator 424 by contacting the terminal portion 426. Alternatively, the second rotation stopper 440 may contact the stator 424 to limit rotation of the stator 424. In this embodiment, the second detent 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 to the body 412 of the swivel joint 410, and rotation of the terminal portion 426 (stator 424) is restricted.

Next, with reference to FIGS. 3(a), 3(b), 4(a), and 4(b), the rotary coupling member 400 included in the construction machine 100 of this embodiment will be described in detail. . FIG. 4A is a side view showing the body 412 and second rotation stopper 440 of the rotational connection member 400. FIG. 4(b) is a top view showing the body 412.

As shown in FIGS. 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.

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

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 the first horizontal holes 412p are connected to each other. It 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 where it communicates with the corresponding first horizontal hole 412p.

FIG. 4(c) is a side view showing the shaft 414, slip ring 420, connection part 430, and first rotation stopper part 414t of the rotational connection member 400. FIG. 4(d) is a top view showing the shaft 414 and the first rotation stopper 414t.

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 horizontal hole 414r extends in the horizontal direction. The plurality of second horizontal holes 414r are provided in the upper part of the shaft 414. The second horizontal hole 414r is connected to the 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 each of the second horizontal holes 414r communicates with a different vertical hole 414p.

Although not shown in FIG. 4C to simplify the drawing, a plurality of O-rings are attached to the circumferential surface of the shaft 414 in a line vertically. The plurality of O-rings seal (divide) the space between the circumferential surface of the shaft 414 and the inner circumferential surface of the main body portion 412a by adjacent O-rings, and each hydraulic actuator installed in the lower traveling body 200 Form an oil passage corresponding to the The oil passages formed by the plurality of O-rings communicate with different first horizontal holes 412p (FIG. 4(a)), respectively.

Next, with reference to FIG. 5, the rotary connection member 400 included in the construction machine 100 of this embodiment will be described. FIG. 5 is an exploded perspective view of the rotary connection member 400.

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

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.

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 approximately equal to the outer edge of the flange portion 422f.

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 via the through hole 430h of the connecting portion 430.

The connecting portion 430 has a main surface 430a and a main surface 430b. A main surface 430a of the connecting portion 430 faces the swivel joint 410, and a 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.

The main surface 430b is provided with a depression 430p that communicates with the through hole 430h. 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 vertically penetrates the recess 430p, and a bolt hole 430t that extends vertically outside the recess 430p. The bolt hole 430s is provided at the bottom 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.

A bolt hole 414s is provided in the shaft 414 of the swivel joint 410 in correspondence with the bolt hole 430s of the connecting portion 430, and the bolt hole 414s is threaded. Bolts b1 are inserted into the bolt holes 430s and 414s, and the connecting portion 430 is fixed to the shaft 414 of the swivel joint 410.

Further, the bolt hole 430t is threaded. Bolts b2 are inserted into the bolt holes 422q of the slip ring 420 and the bolt holes 430t of the connecting portion 430, and the slip ring 420 is fixed to the connecting portion 430.

Therefore, when the shaft 414 rotates as the upper revolving body 300 rotates, the connecting portion 430 and the rotor 422 rotate. That is, the rotor 422 rotates as the upper revolving body 300 turns.

Furthermore, the main surface 430b of the connecting portion 430 is provided with a communication hole 430r. The communication hole 430r communicates between the recess 430p of the connecting portion 430 and the outside of the connecting portion 430. The communication hole 430r can prevent the slip ring 420 from being damaged even if liquid such as rainwater or cleaning liquid intrudes into the rotary connection member 400. In particular, the construction machine 100 may become extremely dirty during work, and the dirt on the construction machine 100 is often cleaned with high-pressure cleaning liquid, so that the liquid may infiltrate into the rotary connection member 400. However, due to the communication hole 430r of the connecting portion 430, even if liquid enters the inside of the rotary connecting member 400, the liquid that has entered can be discharged to the outside of the rotating connecting member 400.

Next, the second detent portion 440 will be explained with reference to FIG. 5. As shown in FIG. 5, the second detent portion 440 has a locking portion 442. As shown in FIG. In the locking portion 442, the second rotation preventing 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 approximately equal to or slightly larger than the diameter of the terminal portion 426. As described above, since the locking part 442 of the second detent part 440 engages with the terminal part 426 of the slip ring 420, even if the rotor 422 of the slip ring 420 rotates, the stator 424 and the terminal part 426 can be suppressed from rotating together with the rotor 422.

Next, with reference to FIG. 6, the lower traveling body 200 and the rotational connection member 400 included in the construction machine 100 of this embodiment will be explained. FIG. 6 is a perspective view showing the rotary connection member 400 and its vicinity.

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 in the center of the center frame 222 and opens in the upper part of the center frame 222 in a circular shape. The support portion 222s is arranged inside the center frame 222. The support portion 222s overlaps the through hole 222p when the center frame 222 is viewed from above.

The rotational connection 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 together with the upper rotating body 300 by the first rotation stopper 414t. Therefore, while the shaft 414 is rotatable with respect to the undercarriage 200 together with the upper revolving structure 300, the body 412 of the swivel joint 410 is fixed relative to the undercarriage 200.

As described with reference to FIGS. 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 414r of the shaft 414 communicates with the vertical hole 414p of the shaft 414. The hole 412p also communicates with the vertical hole 414p of the shaft 414. An oil passage on the upper revolving 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 portion 412a is arranged inside the center frame 222 and connected to the 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 rotating body 300 side and the oil passage on the lower traveling body 200 side.

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

The cable 340 connects to the rotor of the slip ring 420 through the communication hole 414q as described with reference to FIGS. 3(a), 3(b), 4(a) to 4(d), and FIG. 422 and is electrically connected to the rotor 422 . Cable 340 is an example of a "second electric wire." Note that the cable 340 may be a cable routed to the upper revolving structure 300, or may be a cable dedicated to the rotational connection member 400.

The cable 340 rotates as the upper revolving body 300 turns. According to this embodiment, the shaft 414 of the swivel joint 410 and the rotor 422 of the slip ring 420 rotate as the upper rotating body 300 turns. Therefore, even if the cable 340 rotates with the rotation of the upper revolving structure 300, the cable 340 is not cut.

Next, the undercarriage body 200 included in the construction machine 100 of this embodiment will be explained with reference to FIGS. 7 and 8. FIG. 7 is a perspective view showing an undercarriage 200 included in the construction machine 100 of this embodiment. In detail, FIG. 7 shows the undercarriage 200 as seen diagonally from below. FIG. 8 is a front view showing the undercarriage 200 included in the construction machine 100 of this embodiment. Specifically, FIG. 8 shows the undercarriage 200 seen from the front.

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 arranged 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.

In this embodiment, the cover member 280 includes a first cover member 281 and a second cover member 282. The first cover member 281 is located at the center of the center frame 222 in the X-axis direction (front-back direction), as shown in FIG. 7, and extends in the Y-axis direction (left-right direction), as shown in FIG. 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. Specifically, the second cover member 282 extends below the relay connector 260.

Next, the undercarriage body 200 included in the construction machine 100 of this embodiment will be further described with reference to FIGS. 7 and 8. As shown in FIGS. 7 and 8, the cylinder support 222c protrudes from the front surface 223a (FIG. 8) of the undercarriage 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 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 a front surface 223a of the lower traveling body 200.

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.

Next, with reference to FIG. 9, the undercarriage body 200 included in the construction machine 100 of this embodiment will be described. FIG. 9 is an enlarged front view of a part of the lower traveling body 200. However, in FIG. 9, the cover member 280 is not illustrated for easy understanding.

As described with reference to FIG. 1(b) and FIG. 6, the rotational connection member 400 is disposed on the undercarriage 200. Therefore, the swivel joint 410 and the slip ring 420 are arranged on the undercarriage 200. The slip ring 420 is connected to the lower end of the swivel joint 410, and as shown in FIG. 9, a portion of the slip ring 420 projects vertically downward from the lower surface 221a of the lower traveling body 200. In this embodiment, as shown in FIG. 9, a stator 424 is included in a portion of the slip ring 420 that protrudes from the lower surface 221a of the lower traveling body 200 (the lower surface of the center frame 222). As a result, the stator 424 is located below the lower traveling body 200 (center frame 222).

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 made to protrude from the lower surface 221a of the lower traveling body 200 (the lower surface of the center frame 222). . As a result, the height of the driver's seat can be suppressed.

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 made to protrude from the lower surface 221a of the lower traveling body 200 (the lower surface of the center frame 222), so that the driver's seat is raised by the height of the slip ring 420. can be suppressed. Therefore, the position of the center of gravity of the construction machine 100 is unlikely to become high, and the stability of the construction machine 100 is unlikely to decrease. Since the stability of the construction machine 100 does not deteriorate, the riding comfort is also less likely to deteriorate. Furthermore, since the driver's seat is not raised high, it is easy for the operator to get into the driver's seat.

Next, the undercarriage body 200 included in the construction machine 100 of this embodiment will be described with reference to FIGS. 7 to 10. FIG. 10 is another front view showing a part of the lower traveling body 200 in an enlarged manner.

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 of the lower traveling body 200 (the lower surface of the center frame 222). Specifically, the first cover member 281 covers a portion of the slip ring 420 that protrudes from the lower surface 221a of the lower traveling body 200 (the lower surface of the center frame 222). In this embodiment, the first cover member 281 covers the stator 424 of the slip ring 420.

According to the present embodiment, since 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 traveling body 200, the cover member 280 covers Foreign matter 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 can be prevented from colliding with the slip ring 420 (stator 424). Therefore, damage to the slip ring 420 can be prevented.

Next, with reference to FIG. 10, the undercarriage body 200 included in the construction machine 100 of this embodiment will be further described. As shown in FIG. 10, in this embodiment, the lower surface of the first cover member 281 is located above the lowest portion 222cb of the cylinder support 222c. Therefore, before the obstacle passing under the lower traveling body 200 collides with the first cover member 281 while the construction machine 100 is running, the lowest part 222cb of the cylinder support body 222c collides with the obstacle. It is possible to prevent the cover member 281 from colliding with an obstacle and being damaged. As a result, it is possible to prevent the slip ring 420 from being damaged by an obstacle passing under the lower traveling body 200 while the construction machine 100 is running.

Next, with reference to FIG. 11, the undercarriage body 200 included in the construction machine 100 of this embodiment will be described. FIG. 11 is a bottom view showing a part of the lower traveling body 200 and the rotational connection member 400. However, in order to facilitate understanding, the cover member 280 (first cover member 281 and second cover member 282) is omitted in FIG.

As shown in FIG. 11, construction machine 100 further includes a cable 256. Cable 256 is arranged on undercarriage 200. Cable 256 electrically connects to stator 424 of slip ring 420 . Specifically, cable 256 connects to terminal portion 426 of slip ring 420. Cable 256 thus electrically connects with cable 340 described with reference to FIG. Cable 256 is an example of a "first electric wire."

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, cable 256 is electrically connected to relay connector 260. Therefore, relay connector 260 is electrically connected to terminal portion 426 of slip ring 420 (stator 424) via 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).

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

In this way, the rotational connection member 400 electrically connects the cable (cable 340) on the upper revolving structure 300 side extending from the upper revolving structure 300 to the lower traveling structure 200 and the cable (cable 256) disposed on the lower revolving structure 200. Connect to. For this reason, it is possible to suppress the cable (cable 256) disposed on the lower traveling body 200 from being damaged by the turning operation of the upper rotating body 300.

Here, the controller 320 will be explained. When a plurality of construction machines 100 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 the target prism 242 attached to the machine. 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 a specific total station during the earth removal plate control mode.

Specifically, the authentication signal is transmitted 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)). The information is transmitted and received between the controller 320 (FIG. 1(a)) and the target prism 242 (FIG. 1(b)).

Further, the controller 320 supplies driving power to the target prism 242 in order to transmit and receive authentication signals to and from the target prism 242. Specifically, the controller 320 generates first drive power for driving the target prism 242 from the power supplied to the power supply device, and supplies the generated first drive power to the target prism 242 . Specifically, the first driving power is supplied through 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)). The target prism 242 is supplied from the controller 320 .

Further, the controller 320 supplies power to the angle sensor 244 and receives a signal indicating the tilt angle from the angle sensor 244 during the earth removal plate control mode.

Specifically, the controller 320 generates second drive power for driving the angle sensor 244 from the power supplied to the power supply, and supplies the second drive power to the angle sensor 244 . Specifically, the second driving power is supplied through 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)). The angle sensor 244 is supplied from the controller 320 . Further, the signal indicating the tilt angle is transmitted 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). Sent from sensor 244 to controller 320.

Next, with reference to FIG. 11, the construction machine 100 of this embodiment will be further described. As shown in FIG. 11, the cable 256 is routed outside the undercarriage 200. Therefore, the cable 256 can be easily routed. 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 hydraulic piping and hydraulic equipment, and it is not easy to arrange the cable 256. In contrast, according to the present embodiment, the cable 256 can be arranged outside the lower traveling body 200, so that the cable 256 can be easily routed.

In this embodiment, the cable 256 is routed below the lower surface 221a of the lower traveling body 200. As already explained, 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 routing the cable 256 below the lower surface 221a of the lower traveling body 200, connection between the cable 256 and the terminal portion 426 of the slip ring 420 (stator 424) is facilitated. Further, according to the present embodiment, the stator 424 (terminal portion 426) of the slip ring 420 is located outside the undercarriage 200, so the cable 256 can be easily routed outside the undercarriage 200. can.

Next, the undercarriage body 200 included in the construction machine 100 of this embodiment will be explained with reference to FIGS. 10 to 12. FIG. 12 is another bottom view showing a portion of the undercarriage 200 and the rotational connection member 400.

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.

According to the present embodiment, since the second cover member 282 covers the cable 256, the second cover member 282 covers the cable 256 from below the undercarriage body 200 toward the lower surface 221a (the lower surface of the center frame 222) of the undercarriage body 200 while the construction machine 100 is running. It is possible to prevent foreign objects such as flying earth and sand from colliding with the cable 256. Therefore, damage to the cable 256 can be prevented.

Note that, 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 have to cover the second cover member 282.

Next, the second cover member 282 will be explained 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 portion 222cb of the cylinder support 222c. Therefore, before the obstacle passing under the lower traveling body 200 collides with the second cover member 282 while the construction machine 100 is running, the lowest part 222cb of the cylinder support body 222c collides with the obstacle. It is possible to prevent the cover member 282 from colliding with an obstacle and being damaged. As a result, the cable 256 can be prevented from being damaged by an obstacle passing under the undercarriage 200 while the construction machine 100 is running.

Next, with reference to FIG. 13, the undercarriage body 200 included in the construction machine 100 of this embodiment will be described. FIG. 13 is a schematic cross-sectional view showing a part of the lower traveling body 200.

As shown in FIG. 13, the front surface 223a of the lower traveling body 200 (the front surface of the center frame 222) faces the relay connector 260. Specifically, the relay connector 260 is arranged 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 located above the first bent portion 256a.

The cable 256 stands up between the relay connector 260 and the front surface 223a of the undercarriage body 200, and is bent toward the front surface 223a of the undercarriage body 200 at the first bending portion 256a. Further, the cable 256 is bent toward the relay connector 260 at the second bending portion 256b and extends to the relay connector 260.

According to this embodiment, since the cable 256 is bent toward the front surface 223a of the undercarriage body 200 and then bent toward the relay connector 260, the relay connector 260 can be brought close to the front surface 223a of the undercarriage 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 undercarriage body 200 and then bends toward the relay connector 260, the cable 256 bends toward the front surface 223a of the undercarriage body 200. The relay connector 260 can be placed close to the front surface 223a of the lower traveling body 200.

By bringing the relay connector 260 close to the front surface 223a of the lower traveling body 200 in this manner, the relay connector 260 is less likely to come into contact with obstacles or the like. Therefore, damage to the relay connector 260 can be suppressed.

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

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

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-back direction (X-axis direction). Relay connector 260 is inserted into through hole 283a and supported by connector support section 283.

Therefore, according to this embodiment, the relay connector 260 can be placed apart from the lower traveling body 200. As a result, the cable 256 can be placed outside the undercarriage 200. Further, according to the present embodiment, the relay connector 260 can be supported using 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 in this embodiment, the second cover member 282 is used to support the relay connector 260, but a special component for supporting the relay connector 260 may be provided on the undercarriage 200.

Further, according to the present embodiment, the portion of the cable 256 exposed between the lower traveling body 200 and the relay connector 260 can be covered by the overhang portion 282a of the second cover member 282. Therefore, foreign objects such as earth and sand flying from below the undercarriage body 200 while the construction machine 100 is running are prevented from colliding with the portion of the cable 256 that is exposed between the undercarriage body 200 and the relay connector 260. can.

Next, the undercarriage body 200 included in the construction machine 100 of this embodiment will be explained with reference to FIGS. 14 and 15. FIG. 15 is an enlarged perspective view of a part of the lower traveling body 200. Specifically, FIG. 15 shows the relay connector 260 and its vicinity. Note that in FIGS. 14 and 15, the covers 260a and 260b are shown exploded for easy understanding.

As shown in FIGS. 14 and 15, the relay connector 260 further includes a pair of upper and lower covers 260a and 260b. Cover 260a is located above cover 260b. The pair of upper and lower covers 260a and 260b have cutouts that 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 and 260b are each fixed to the connector support portion 283 with, for example, bolts.

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-described embodiments, and can be implemented in various forms without departing from the spirit thereof. Further, the plurality of components disclosed in the above embodiments can be modified as appropriate. For example, some of the components shown in one embodiment may be added to the components of another embodiment, or some of the components shown in one embodiment may be configured. Elements may be deleted from the embodiment.

The drawings mainly schematically show each component in order to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each illustrated component may vary depending on the convenience of drawing. The above image may differ from the actual one. Further, the configuration of each component shown in the above embodiment is an example, and is not particularly limited, and it goes without saying that various changes can be made without substantially departing from the effects of the present invention. .

For example, in the embodiment described with reference to FIG. It may further include an angle sensor that detects the angle of the plate 232.

Furthermore, in the embodiment described with reference to FIGS. 1(a) to 15, the selector valve 238 had a pilot-type switching valve, but the selector valve 238 is a solenoid valve instead of a pilot-type switching valve. It may have. In this case, instead of the hydraulic hose that supplies the pilot pressure, a cable that transmits a switching signal that switches the valve position of the electromagnetic valve is provided.

Further, in the embodiments described with reference to FIGS. 1(a) to 15, the construction machine 100 was equipped with the target prism 242, but the construction machine 100 was equipped with a global positioning satellite system (Global Positioning Satellite System) instead of the target prism 242. Navigation Satellite System (GNSS) antenna may also be provided. In this case, the three-dimensional coordinates of the earth removal plate 232 can be obtained without using a total station. Specifically, the position information of the GNSS antenna is input from the GNSS antenna to the controller 320 via the first cable 252, relay connector 260 (first connector 262), cable 256, slip ring 420, and cable 340. The controller 320 acquires the three-dimensional coordinates of the earth removal plate 232 based on the position information of the GNSS antenna.

Further, in the embodiment described with reference to FIGS. 1(a) to 15, the cable 256 was routed below the lower surface 221a of the undercarriage body 200, but the cable 256 was routed outside the undercarriage body 200. It would be good if measures were taken. For example, the cable 256 may extend upward from the terminal portion 426 at the lower end of the rotary connection member 400 and extend from the upper surface of the undercarriage 200, and then be routed above the upper surface of the undercarriage 200.

Further, 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 undercarriage body 200, but a part of the slip ring 420 does not extend beyond the undercarriage body 200. It may protrude from the top surface. In this case, the cable 256 is routed above the upper surface of the undercarriage 200. Alternatively, the cable 256 may be routed below the lower surface 221a of the undercarriage body 200 after extending downward from the terminal portion 426 at the upper end of the rotary connection member 400 and extending from the lower surface 221a of the undercarriage body 200. .

Further, 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 undercarriage body 200, but the entire slip ring 420 is inside the undercarriage body 200. may be placed in In this case, the cable 256 may be routed outside the undercarriage 200 after being extended from the inside of the undercarriage 200 to the outside.

For example, the cable 256 may extend vertically downward from the terminal portion 426 of the slip ring 420 and extend to the outside of the undercarriage body 200 from the lower surface 221a of the undercarriage 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 undercarriage 200 to the outside of the undercarriage 200.

INDUSTRIAL APPLICATION This invention is applicable to construction machines, such as a hydraulic shovel, and has industrial applicability.

100: Construction machine 200: Lower traveling body 221a: Lower surface 222c: Cylinder support 222cb: Bottom part 230: Earth removal device 232: Earth removal plate 234a: Lift cylinder 244: Angle sensor 254: Second cable 256: Cable 256a: No. 1st bending part 256b : 2nd bending part 260 : Relay connector 264 : 2nd connector 280 : Cover member 281 : 1st cover member 282 : 2nd cover member 282a : Overhang part 283 : Connector support part 300 : Upper revolving body 340 : Cable 420 : Slip ring 422 : Rotor 424 : Stator 426 : Terminal part

Claims (7)

A movable lower running body,
an upper revolving body disposed above the undercarriage body and capable of rotating with respect to the undercarriage body;
a slip ring having a stator and a rotor that are electrically connected and disposed on the undercarriage;
a first electric wire disposed on the lower running body and electrically connected to the stator;
a second electric wire extending from the upper revolving body to the rotor and electrically connecting to the rotor;
The rotor is rotatable with respect to the stator,
The rotor rotates with the rotation of the upper rotating body,
A construction machine, wherein a portion of the slip ring protrudes downward from a lower surface of the undercarriage. the portion of the slip ring includes the stator;
The construction machine according to claim 1, wherein the stator is located below the undercarriage. The construction machine according to claim 1 or 2, wherein the first electric wire is routed outside the undercarriage. The construction machine according to any one of claims 1 to 3, wherein the first electric wire is routed below a lower surface of the undercarriage. an earth removal device having an earth removal plate;
a sensor provided in the soil removal device;
a connector connected to the first electric wire;
further comprising: a third electric wire electrically connected to the sensor, extending from the sensor to the connector, and connecting to the connector;
The connector electrically connects the first electric wire and the third electric wire,
The lower traveling body has a side surface facing the connector,
The construction machine according to claim 4, wherein the first electric wire stands up between the connector and the side surface, bends toward the side surface, bends toward the connector, and extends to the connector. a cover member provided on the lower surface of the lower traveling body and covering the part of the slip ring and the first electric wire;
further comprising a cylinder support protruding from the lower traveling body toward the earth removal plate,
The earth removal device has a cylinder that drives the earth removal plate,
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. The cover member is
an overhang extending from the lower traveling body toward the connector;
The construction machine according to claim 6, further comprising a connector support part that is fixed to the overhang part and supports the connector.

Images