Working machinery

Abstract

To provide a work machine that allows for compact routing of hydraulic hoses and harnesses. [Solution] The work machine comprises a lower body, a pair of left and right arms attached to the lower body and extending forward, a blade attached to the tip of the arms, a hydraulic hose extending from the lower body to the blade, and a harness extending from the lower body to the blade. The hydraulic hose extends along one of the arms and is positioned offset vertically from the harness.

Description

Technical Field

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

Background Art

[0002] Conventionally, as a working machine such as a hydraulic excavator, for example, the construction machine of Patent Document 1 is known. The construction machine has an external hose and an external harness. The external hose is provided to extend from the lower traveling body along one of the pair of left and right arms to the blade side and is connected to hydraulic equipment. The external harness is provided to extend from the lower traveling body along the other arm to the blade side and is connected to a blade displacement detection device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration of Patent Document 1 described above, since the hydraulic hose (external hose) and the harness (external harness) are routed separately in the left-right direction, it is difficult to route them compactly.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a working machine capable of routing a hydraulic hose and a harness compactly.

Means for Solving the Problems

[0006] A working machine according to one aspect of the present invention comprises a lower body, a pair of left and right arms attached to the lower body and extending forward, and a blade attached to the tip of each arm, wherein the working machine comprises a hydraulic hose extending from the lower body to the blade and a harness extending from the lower body to the blade, the hydraulic hose extending along one of the arms and positioned offset vertically from the harness. [Effects of the Invention]

[0007] With the above configuration, hydraulic hoses and harnesses can be routed compactly. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing a schematic configuration of a hydraulic excavator, which is an example of a work machine according to the present invention. [Figure 2] This is a block diagram showing the electrical configuration for controlling a blade machine. [Figure 3] This is a perspective view showing the front side configuration of the lower traveling body of the hydraulic excavator described above. [Figure 4] This is a perspective view showing the front side of the lower traveling body described above, with some components omitted from the illustration. [Figure 5] This is a magnified perspective view showing the support portion of the right angle cylinder in the right arm. [Figure 6] This is a perspective view of the storage unit attached to the lower vehicle body, seen from a diagonal front angle. [Figure 7] This is a front view of the above storage compartment as seen from the front. [Figure 8] This is a perspective view of the above-mentioned storage compartment from below. [Figure 9] This is a perspective view of the front wall of the lower traveling body shown above, viewed from the left arm side. [Figure 10] This is a plan view showing the front configuration of the lower traveling body described above. [Figure 11] This is a perspective view showing the external appearance of the first retaining part that constitutes the retaining part. [Figure 12A] This is an exploded perspective view of the first retaining part shown above. [Figure 12B] This is an exploded perspective view of the first retaining part shown above. [Figure 13] This is a cross-sectional view showing the state after the first harness has been passed through the passage hole in the covering member and the covering member has been folded back. [Figure 14] This is a perspective view showing another example of the configuration of the above-mentioned retaining part. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings.

[0010] [1. Overview of the machinery] Figure 1 is a side view showing the schematic configuration of a hydraulic excavator 1, which is an example of a work machine according to this embodiment. The hydraulic excavator 1 comprises a lower traveling body 2, a work machine 3, and an upper rotating body 4.

[0011] Herein, in this specification, each direction is described according to the following definitions. First, the direction in which the operator (driver, operator) seated in the driver's seat 41a of the upper slewing body 4 faces forward is defined as the front, and the opposite direction is defined as the rear. Therefore, when the upper slewing body 4 is not slewing relative to the lower traveling body 2 (slewing angle 0°), the longitudinal direction of the upper slewing body 4 coincides with the direction in which the lower traveling body 2 moves forward and backward. Also, the left side as seen from the perspective of the operator seated in the driver's seat 41a is defined as "left," and the right side as "right." Furthermore, the direction of gravity perpendicular to the longitudinal and left-right directions is defined as the up-down direction, with the upstream side of the direction of gravity being defined as "up," and the downstream side being defined as "down." In the drawings, the hydraulic excavator 1 is shown with the upper slewing body 4 not slewing relative to the lower traveling body 2. Also, in the drawings, the forward direction is indicated by the symbol "F," the rear by "B," the left by "L," the right by "R," the upper by "U," and the lower by "D," as necessary.

[0012] The lower traveling body 2 is a support (lower body) that supports the upper slewing body 4. The lower traveling body 2 includes a pair of left and right crawlers 21 and a pair of left and right traveling motors 22. Each traveling motor 22 is a hydraulic motor. By driving the left and right crawlers 21 with the left and right traveling motors 22 respectively, the hydraulic excavator 1 can be moved forward and backward. The left and right traveling motors 22 are respectively supported by the left and right side frames 23. Each side frame 23 extends in the front-rear direction and is arranged on both the left and right sides of the center frame 24 (see FIG. 3) and supported by the center frame 24.

[0013] An earth discharging device 5 for performing leveling work is attached to the front side of the lower traveling body 2. The earth discharging device 5 includes a blade 51. A target prism 512 is provided on one side (for example, the left side) in the left-right direction of the blade 51 via a support column 511. The target prism 512 is provided to realize blade machine control. Details of the blade machine control including the target prism 512 will be described later.

[0014] The working machine 3 is a working device for performing excavation work such as earth and sand. The working machine 3 is provided at the front part of the upper slewing body 4 and performs excavation work by rotating in the vertical direction or the front-rear direction.

[0015] The upper slewing body 4 is an upper body located above the lower traveling body 2. The upper slewing body 4 is supported so as to be slewingable with respect to the lower traveling body 2. An operation part 41, a slewing frame 42, a slewing motor 43, and a machine room 44 are arranged on the upper slewing body 4. The upper slewing body 4 slews via a slewing bearing (not shown) by driving of the slewing motor 43 which is a hydraulic motor. At the rear part of the upper slewing body 4, in addition to an engine 40 that provides power to each part, a plurality of hydraulic pumps (not shown) are arranged.

[0016] Each hydraulic pump supplies hydraulic fluid (pressurized oil) to hydraulic motors (e.g., left and right travel motors 22, slewing motor 43) and hydraulic cylinders via hydraulic piping. The hydraulic cylinders include lift cylinders 52 (see Figure 3, etc.), which will be described later. The hydraulic motors and hydraulic cylinders, which are driven by hydraulic fluid supplied from any hydraulic pump, are collectively called hydraulic actuators.

[0017] The driver's seat 41a is located in the driver's unit 41. Various operating levers 41b are arranged around the driver's seat 41a. When the operator sits in the driver's seat 41a and operates the operating levers 41b, a predetermined hydraulic actuator is driven.

[0018] The driver's compartment 41 includes a canopy 45. The canopy 45 is erected above the rear of the engine room 44 and covers at least the area above the driver's seat 41a. Alternatively, a cabin may be provided instead of the canopy 45.

[0019] [2. Regarding blade machine control] Figure 2 is a block diagram showing the electrical configuration for blade machine control in hydraulic excavator 1. Figure 3 is a perspective view showing the front configuration of the lower traveling body 2. Figure 4 is a perspective view showing the front configuration of the lower traveling body 2 with some of the components shown in Figure 3 omitted.

[0020] Blade machine control refers to a control system that automatically adjusts the posture (height, position, angle) of the blade 51 based on three-dimensional data of the ground to be constructed and the position information of the blade 51. Hereinafter, blade machine control will also be simply referred to as machine control. In this embodiment, in order to realize such machine control, the hydraulic excavator 1 is equipped with the target prism 512 described above.

[0021] The target prism 512 is composed of a 360° prism. A 360° prism can reflect light in a direction parallel to the incident light, regardless of the direction from which the light enters. The target prism 512 is the object whose position is measured by the total station TS, which will be described later. The target prism 512 is mounted on the top of the support column 511 and attached to the blade 51 via the support column 511.

[0022] As shown in Figures 3 and 4, the support column 511 is attached to the upper surface of the mounting base 513 using fastening members such as bolts. The mounting base 513 is provided at two locations on the left and right sides of the blade 51, for example, the left side and the right side, by welding or the like. Therefore, the support column 511 can be selectively attached to either the left or right mounting base 513 while holding the target prism 512. In this embodiment, as shown in Figure 3, an example is shown in which the support column 511 is attached to the left mounting base 513, but the support column 511 may also be attached to the right mounting base 513.

[0023] A total station TS (see Figure 2) is installed at or near the work site of the hydraulic excavator 1. The total station TS is composed of a known electronic distance and angle measuring device that uses light. The total station TS measures the vertical angle, horizontal angle, and distance of the target prism 512 by shining light onto the target prism 512 and receiving the light reflected by the target prism 512. As a result, the three-dimensional position coordinates of the target prism 512 are calculated and obtained. The total station TS is configured as an automatic tracking type and has the function of automatically tracking changes in the position of the target prism 512. The total station TS acquires changes in the position of the target prism 512 in real time while tracking the target prism 512.

[0024] The hydraulic excavator 1 is fitted with a control unit 61, as shown in Figure 2. The control unit 61 is a controller for machine control and consists of an electronic control unit, also known as an ECU (Electronic Control Unit). The control unit 61 can acquire position information of the target prism 512 obtained by the total station TS via a communication unit 62, which includes an antenna, etc.

[0025] The target prism 512 described above is connected to the control unit 61 via the first harness EN1. Authentication signals are transmitted and received between the target prism 512 and the control unit 61 via the first harness EN1. This allows the control unit 61 to reliably receive only position information from a specific total station TS via the communication unit 62. Communication between the total station TS and the communication unit 62 is performed, for example, wirelessly.

[0026] The hydraulic excavator 1 is further equipped with an attitude detection sensor 514. The attitude detection sensor 514 consists of, for example, an inertial measurement unit (IMU). The inertial measurement unit is a device equipped with a 3-axis gyro sensor and a 3-directional accelerometer.

[0027] As shown in Figure 4, the attitude detection sensor 514 is mounted on the blade 51. In this embodiment, the attitude detection sensor 514 is mounted on the blade 51 towards the target prism 512 side (left side) rather than the center in the left-right direction. The attitude detection sensor 514 can detect the position (3D position) and acceleration of the blade 51 in the left-right, front-back, and up-down directions. Furthermore, based on the acceleration information, the tilt angle of the blade 51 in the left-right, front-back, and up-down directions can be detected. In other words, the attitude of the blade 51 can be detected by the attitude detection sensor 514.

[0028] As shown in Figure 2, the attitude detection sensor 514 is connected to the control unit 61 via the second harness EN2. This allows the control unit 61 to acquire the detection signal output from the attitude detection sensor 514, i.e., the attitude information of the blade 51, via the second harness EN2.

[0029] The first harness EN1 and the second harness EN2 described above are collectively referred to as harness EN. In this case, harness EN can be expressed as follows: Harness EN includes the first harness EN1 connected to the target prism 512 and the second harness EN2 connected to the attitude detection sensor 514. The effects described in this embodiment are particularly effectively obtained in a configuration in which harness EN includes the first harness EN1 and the second harness EN2.

[0030] The control unit 61 operates according to the operation program stored in the memory unit 63. The memory unit 63 is a memory that stores various types of information and is composed of, for example, RAM (Random Access Memory), ROM (Read Only Memory), hard disk, SSD (Solid State Drive), non-volatile memory, etc. The memory unit 63 stores, for example, an operation program for machine control and 3D data of the construction surface.

[0031] Therefore, by executing the above operation program, the control unit 61 can control the electromagnetic proportional valve 71 and the solenoid valve 72 based on the position information of the target prism 512 acquired via the total station TS, the attitude information of the blade 51 acquired from the attitude detection sensor 514, and the three-dimensional data of the construction surface.

[0032] The solenoid proportional valve 71 is provided to control a directional control valve included in a control valve (not shown). The directional control valve includes a directional control valve for the lift cylinder 52 shown in Figure 4, and a directional control valve shared by the angle cylinder 53 and the tilt cylinder 54. The former directional control valve for the lift cylinder 52 refers to a directional control valve for controlling the flow rate and direction of the hydraulic fluid supplied from a hydraulic pump (not shown) to the lift cylinder 52. The latter directional control valve refers to a directional control valve for controlling the flow rate and direction of the hydraulic fluid supplied from the hydraulic pump to the angle cylinder 53 or the tilt cylinder 54. The angle cylinder 53 and the tilt cylinder 54 are connected to the solenoid valve 72 via separate piping.

[0033] The solenoid valve 72 is a switching valve for switching the destination of the hydraulic fluid supply from the hydraulic pump to either the angle cylinder 53 or the tilt cylinder 54. In other words, the solenoid valve 72 switches the oil passage to either the angle cylinder 53 or the tilt cylinder 54 based on an electrical signal (control signal) from the control unit 61.

[0034] The lift cylinder 52 shown in Figure 4 is a hydraulic cylinder that raises and lowers the blade 51 in the vertical direction. The angle cylinder 53 is a hydraulic cylinder that swings the left and right ends of the blade 51 in the front-rear direction. The tilt cylinder 54 is a hydraulic cylinder that swings the left and right ends of the blade 51 in the vertical direction. Therefore, the control unit 61 can extend or retract at least one of the lift cylinder 52, angle cylinder 53, and tilt cylinder 54 by controlling the electromagnetic proportional valve 71 and solenoid valve 72 based on the position information of the target prism 512 described above. This allows the blade 51 to be moved along the construction surface by automatically adjusting the vertical position, the front-rear tilt angle, and the left-right tilt angle of the blade 51.

[0035] [3. Regarding the blade support structure] Next, the support structure for the blade 51 will be described. As shown in Figures 3 and 4, the lift cylinder 52 described above is positioned between a pair of left and right arms 55, that is, between the left arm 55L and the right arm 55R. The left arm 55L and the right arm 55R are attached to the lower traveling body 2 and extend forward.

[0036] More specifically, an arm support portion 242 is provided on the front wall portion 241 of the center frame 24 of the lower traveling body 2. The arm support portion 242 has a structure that sandwiches an arm 55 between a pair of plate-like members and supports the arm 55 so that it can rotate in the vertical direction. The arm support portions 242 are provided projecting forward from different positions in the left-right direction on the front wall portion 241. The left arm 55L and the right arm 55R are each supported by the left and right arm support portions 242 and extend toward the blade 51 in front. The tips of the left arm 55L and the right arm 55R are connected to the left end and right end, respectively, of a connecting portion 551 (see Figure 4) that extends in the left-right direction. The blade 51 is positioned in front of the connecting portion 551 and is rotatably attached to the connecting portion 551 via a pivot axis that extends in the front-rear direction.

[0037] Thus, the hydraulic excavator 1 of this embodiment comprises a lower traveling body 2 as the lower body, a pair of left and right arms 55 attached to the lower traveling body 2 via arm support parts 242 and extending forward, and a blade 51 attached to the tip side of the arms 55 via connecting parts 551.

[0038] A lift cylinder support portion 243 (see Figure 4) is provided in the center of the front wall portion 241 in the left-right direction. The lift cylinder support portion 243 is positioned between the left and right arm support portions 242 and protrudes forward from the front wall portion 241. The left and right arm support portions 242 are positioned symmetrically in the left-right direction with respect to the lift cylinder support portion 243.

[0039] The lift cylinder support section 243 has a structure that sandwiches one end (e.g., the rod end) of the lift cylinder 52 between a pair of plate-shaped members, thereby supporting the lift cylinder 52 so that it can rotate vertically. The other end of the lift cylinder 52 is supported on the back surface of the connecting section 551 so that it can rotate vertically. A portion of the lift cylinder 52 is covered by a lift cylinder protective cover 52a (see Figure 3). The lift cylinder protective cover 52a is attached to the lift cylinder support section 243.

[0040] Two hydraulic hoses, namely lift hydraulic hoses H11 and H12, are connected to the lift cylinder 52. By supplying or discharging hydraulic fluid to the lift cylinder 52 through one or the other of the lift hydraulic hoses H11 and H12, the lift cylinder 52 extends or retracts. The lift hydraulic hoses H11 and H12 pass through predetermined hose insertion holes provided in the front wall portion 241 of the center frame 24 and are connected to a swivel joint SJ (see Figure 10). The swivel joint SJ is provided extending vertically through the central portion of the center frame 24 and is connected to a hydraulic pump via an oil passage.

[0041] As shown in Figure 4, the angle cylinder 53 includes a right angle cylinder 53R and a left angle cylinder 53L. The right angle cylinder 53R is positioned to the right of the right arm 55R. One end of the right angle cylinder 53R (the rod end) is supported by the right arm 55R. The other end of the right angle cylinder 53R (the bottom end) is supported on the back of the blade 51 at a position to the right of the center in the left-right direction.

[0042] Figure 5 is a magnified perspective view showing the support portion of the right angle cylinder 53R on the right arm 55R. The right angle cylinder 53R and the solenoid valve 72 described above are connected by two hydraulic hoses, namely the right angle hydraulic hoses H21 and H22. The right angle hydraulic hose H21 is connected to the retraction side connection of the right angle cylinder 53R. This retraction side connection is connected to the space on the rod side of the piston within the right angle cylinder 53R. The right angle hydraulic hose H22 is connected to the extension side connection of the right angle cylinder 53R. This extension side connection is connected to the space on the bottom side of the piston within the right angle cylinder 53R.

[0043] The solenoid valve 72 is connected to the swivel joint SJ (see Figure 10) via two shared hydraulic hoses H1 and H2. The two shared hydraulic hoses H1 and H2 are routed through an opening 241P (see Figure 6) provided in the front wall portion 241 of the center frame 24. When the solenoid valve 72 switches the oil passage to the angle cylinder 53 side, hydraulic fluid is supplied to and discharged from the right angle cylinder 53R via one or the other of the right angle hydraulic hoses H21 and H22. This causes the right angle cylinder 53R to extend or retract in the front-rear direction.

[0044] As shown in Figure 4, the left angle cylinder 53L is positioned to the left of the left arm 55L. One end of the left angle cylinder 53L (the rod end) is supported by the left arm 55L. The other end of the left angle cylinder 53L (the bottom end) is supported on the back of the blade 51 at a position to the left of the center in the left-right direction.

[0045] The left angle cylinder 53L is connected to two hydraulic hoses, namely the left angle hydraulic hoses H23 and H24. The left angle hydraulic hose H23 is connected to the extension side connection of the left angle cylinder 53L. The left angle hydraulic hose H24 is connected to the contraction side connection of the left angle cylinder 53L. Also, as shown in Figure 5, the left angle hydraulic hose H23 communicates with the right angle hydraulic hose H21. In other words, the left angle hydraulic hose H23 is provided as a branch from the right angle hydraulic hose H21. On the other hand, the left angle hydraulic hose H24 communicates with the right angle hydraulic hose H22. In other words, the left angle hydraulic hose H24 is provided as a branch from the right angle hydraulic hose H22.

[0046] By arranging the hydraulic hoses in this manner, for example, when hydraulic fluid is supplied from the solenoid valve 72 to the right angle cylinder 53R via the right angle hydraulic hose H21, hydraulic fluid is supplied to the left angle cylinder 53L via both the right angle hydraulic hose H21 and the left angle hydraulic hose H23. In this case, the right angle cylinder 53R retracts and the left angle cylinder 53L extends, causing the blade 51 to tilt to the right with respect to the direction of travel of the hydraulic excavator 1. In other words, the blade 51 tilts so that its left end is located further forward than its right end.

[0047] Conversely, when hydraulic fluid is supplied from the solenoid valve 72 to the right angle cylinder 53R via the right angle hydraulic hose H22, hydraulic fluid is supplied to the left angle cylinder 53L via both the right angle hydraulic hose H22 and the left angle hydraulic hose H24. In this case, the right angle cylinder 53R extends and the left angle cylinder 53L contracts, causing the blade 51 to tilt to the left with respect to the direction of travel of the hydraulic excavator 1. In other words, the blade 51 tilts so that its right end is located further forward than its left end.

[0048] In this embodiment, there are two angle cylinders 53 (left angle cylinder 53L and right angle cylinder 53R), but there may be only one on either the left or right side. However, from the viewpoint of rotating the blade 51 in a balanced manner in the front-rear direction, it is desirable to have two angle cylinders 53 as in this embodiment.

[0049] As shown in Figure 4, the tilt cylinder 54 is positioned between the connecting portion 551 and the blade 51 and extends and retracts in the left-right direction. One end of the tilt cylinder 54 (for example, the left end) is supported on the front of the connecting portion 551 at a position above the pivot axis of the blade 51 (extending in the front-rear direction). The other end of the tilt cylinder 54 (for example, the right end) is supported on the back of the blade 51 at a position to the right of the center in the left-right direction.

[0050] The tilt cylinder 54 and the solenoid valve 72 are connected by two hydraulic hoses, namely tilt hydraulic hoses H31 and H32. Tilt hydraulic hose H31 is connected to the bottom side of the tilt cylinder 54. Tilt hydraulic hose H32 is connected to the rod side of the tilt cylinder 54.

[0051] Therefore, for example, when hydraulic fluid is supplied from the solenoid valve 72 to the tilt cylinder 54 via the tilt hydraulic hose H31, the tilt cylinder 54 extends. As a result, the blade 51 rotates in a direction where the right end goes down and the left end goes up. Conversely, when hydraulic fluid is supplied from the solenoid valve 72 to the tilt cylinder 54 via the tilt hydraulic hose H32, the tilt cylinder 54 retracts. As a result, the blade 51 rotates in a direction where the right end goes up and the left end goes down.

[0052] The lift hydraulic hoses H11 and H12, the shared hydraulic hoses H1 and H2, the right angle hydraulic hoses H21 and H22, the left angle hydraulic hoses H23 and H24, and the tilt hydraulic hoses H31 and 32 described above are collectively referred to as hydraulic hose H. In this case, hydraulic hose H can be expressed as follows.

[0053] In other words, the hydraulic hose H includes a first hydraulic hose, a second hydraulic hose, and a third hydraulic hose. Here, the first hydraulic hose refers to common hydraulic hoses H1 and H2 that are connected to the solenoid valve 72 through the opening 241P (see Figure 6) of the front wall portion 241. The second hydraulic hose refers to right angle hydraulic hoses H21 and H22 that extend from the solenoid valve 72 toward the angle cylinder 53 (e.g., the right angle cylinder 53R). The third hydraulic hose refers to tilt hydraulic hoses H31 and 32 that extend from the solenoid valve 72 toward the tilt cylinder 54. The effects described in this embodiment are particularly effective in configurations in which the hydraulic hose H includes at least the first hydraulic hose.

[0054] [4. Routing of harnesses and hydraulic hoses] Next, the routing of the harness EN and hydraulic hose H described above will be explained with reference to Figures 6 to 8. Figure 6 is a perspective view of the housing 56, which will be attached to the lower traveling body 2 and will be described later, when viewed from the front at an angle. Figure 7 is a front view of the housing 56 when viewed from the front. Figure 8 is a perspective view of the housing 56 when viewed from below. The lower traveling body 2 has the front wall portion 241 described above.

[0055] The front wall portion 241 is a wall portion erected on the front side of the lower surface portion 24D (see Figure 8) of the center frame 24. An opening 241P is provided in the front wall portion 241. The hydraulic hoses H (particularly the common hydraulic hoses H1 and H2) connected to the swivel joint SJ extend forward through the opening 241P (particularly see Figure 6). Thus, the hydraulic excavator 1 of this embodiment is provided with an opening 241P through which the hydraulic hoses H extend from the lower traveling body 2 (particularly the center frame 24) toward the blade 51.

[0056] A housing section 56 is attached to the front surface of the front wall section 241. The housing section 56 is, for example, made up of a box and is attached to the front wall section 241 using fastening members 241a such as bolts. For example, a mounting piece 56m extending in the left-right direction is integrally provided on the rear surface of the housing section 56. The housing section 56 can be easily attached to and detached from the front wall section 241 by inserting the fastening member 241a into a hole (not shown) provided in the mounting piece 56m and a fastening hole (not shown) provided in the front wall section 241, and tightening or loosening the fastening member 241a by engaging it with a nut (not shown). The housing section 56 is attached to the front wall section 241, for example, between the lift cylinder support section 243 and the right arm support section 242.

[0057] As shown in Figure 7, a base end BE is provided at the front end 56F of the housing section 56. The base end BE is a connector CN to which the harness EN can be attached and detached. Therefore, it can also be said that the connector CN is provided at the front end 56F of the housing section 56.

[0058] The base end BE has a first base end BE1 and a second base end BE2. The first base end BE1 is a first connector CN1 to which the first harness EN1 is connected. The second base end BE2 is a second connector CN2 to which the second harness EN2 is connected. By connecting the harness EN to the base end BE, the harness EN is routed to extend from the center frame 24 side of the lower traveling body 2 to the front blade 51 side. Thus, the hydraulic excavator 1 of this embodiment has a base end BE to which the harness EN extending from the lower traveling body 2 (particularly the center frame 24 side) to the blade 51 side is connected.

[0059] As shown in Figure 8, the housing section 56 has a notch 561C in its bottom surface 561. Alternatively, a closed hole may be provided in the bottom surface 561 instead of the notch 561C.

[0060] Furthermore, a cable CA extends from the outside (downward) of the lower surface portion 24D of the lower traveling body 2. One end of the cable CA is connected to a slip ring SR. The slip ring SR is electrically connected to the control unit 61 described above. The other end of the cable CA is connected to the base end portion BE on the opposite side from the side connected to the harness EN. Therefore, the control unit 61 can transmit and receive signals between the target prism 512 and the attitude detection sensor 514 via the harness EN, base end portion BE, cable CA, and slip ring SR. In this way, the hydraulic excavator 1 is equipped with a cable CA that extends from the outside of the lower surface portion 24D of the lower traveling body 2.

[0061] The cable CA described above extends from below the housing 56 through the notch 561C into the interior of the housing 56. Inside the housing 56, cable CA connects to the base end BE (connector CN) from the side opposite to the side connected to harness EN. Cable CA is routed by bundling two individual cables together. One individual cable connects the slip ring SR to the first base end BE1. The other individual cable connects the slip ring SR to the second base end BE2.

[0062] In this embodiment, as shown in Figure 7, the opening 241P and the base end BE are positioned offset from each other in the vertical direction. Specifically, the base end BE is positioned above the opening 241P. By positioning the opening 241P and the base end BE in this way, as shown in Figure 6, the hydraulic hoses H (particularly the shared hydraulic hoses H1 and H2) extending from the opening 241P towards the blade 51 and the harnesses EN (particularly the first harness EN1 and the second harness EN2) connected to the base end BE and extending towards the blade 51 can be routed side by side in the vertical direction. This allows the hydraulic hoses H and harnesses EN to be routed together, that is, compactly.

[0063] In particular, in a configuration where the base end BE is positioned above the opening 241P, the harness EN connected to the base end BE can be routed above the hydraulic hose H extending forward from the opening 241P. By routing the harness EN above the hydraulic hose H in this way, the risk of contact with the harness EN is reduced, even if the hydraulic hose H bends. Therefore, damage to the harness EN due to contact with the hydraulic hose H is reduced.

[0064] The base end BE may be positioned below the opening 241P. However, in this case, it is desirable to take measures such as supporting the hydraulic hose H to avoid contact with the harness EN.

[0065] As shown in Figure 7, the opening 241P is positioned laterally offset from the base end BE. More specifically, the opening 241P is positioned offset to the right of the base end BE. In this case, a portion of the opening 241P may be positioned to the left of the right end of the first base end BE1. Alternatively, the entire opening 241P may be positioned to the left of the right end of the first base end BE1. In other words, it is sufficient that at least a portion of the opening 241P is positioned to the right of the right end of the first base end BE1. Note that the opening 241P may also be positioned offset to the left of the base end BE. For example, by positioning the housing 56 closer to the right arm support 242 on the front wall 241, it is possible to position the opening 241P to the left of the second base end BE2, directly below it.

[0066] With the opening 241P and the base end BE arranged in this manner, it becomes easy to secure ample vertical space in front of the base end BE (towards the blade 51), and at the same time, it becomes easy to secure ample vertical space in front of the opening 241P. This makes it easier to connect the harness EN to the base end BE and to pass the hydraulic hoses H (especially the shared hydraulic hoses H1 and H2) through the opening 241P. Therefore, the above arrangement of the opening 241P and the base end BE is desirable in terms of expected improvement in workability.

[0067] As shown in Figure 6, in this embodiment, the opening 241P and the base end BE are positioned on the right arm 55R side relative to the lift cylinder 52. In other words, the opening 241P and the base end BE are positioned on one of the pair of left and right arms 55 (the right arm 55R) relative to the lift cylinder 52. This arrangement of the opening 241P and the base end BE is desirable because it allows for the integrated routing of the hydraulic hose H and harness EN on one arm 55 side of the lift cylinder 52.

[0068] As shown in Figure 6, the hydraulic hoses H (e.g., shared hydraulic hoses H1 and H2) extending from the opening 241P extend forward along one arm 55 (particularly the right arm 55R), that is, towards the blade 51. The hydraulic hoses H are positioned below the harness EN (e.g., first harness EN1 and second harness EN2) between the lift cylinder 52 and one arm 55 (right arm 55R). Therefore, in the hydraulic excavator 1 of this embodiment, the hydraulic hoses H extend along one arm 55 (particularly the right arm 55R) and are positioned offset vertically from the harness EN.

[0069] In this configuration, the hydraulic hose H and harness EN can be positioned together on one side of the arm 55 (right arm 55R) relative to the lift cylinder 52. In other words, the hydraulic hose H and harness EN are not dispersed, for example, in the left-right direction. Therefore, even if the hydraulic hose H extends along one arm 55 and is positioned offset from the harness EN in the vertical direction, a compact arrangement of the hydraulic hose H and harness EN can be achieved.

[0070] Furthermore, in a configuration where the base end BE is positioned on the right arm 55R side relative to the lift cylinder 52, the harness EN connected to the base end BE is positioned on the right arm 55R side relative to the lift cylinder 52 and extends from the lower travel body 2 towards the front blade 51. In other words, the harness EN is positioned on the right arm 55R side of one of the pair of left and right arms 55 and extends from the lower travel body 2 towards the blade 51. In this case, the hydraulic hose H and harness EN can be arranged vertically along one of the arms 55 (for example, the right arm 55R) to achieve a compact wiring arrangement.

[0071] As shown in Figure 6, in this embodiment, the housing portion 56 is attached to the front wall portion 241. As a result, the base end portion BE provided at the front end portion 56F of the housing portion 56 is positioned forward of the opening 241P provided in the front wall portion 241. In this case, since the base end portion BE is positioned upstream of the opening 241P in the direction in which the harness EN is inserted, insertion (connection) of the harness EN to the base end portion BE becomes easier. Furthermore, from the viewpoint of enabling attachment and detachment of the harness EN to the base end portion BE, it is desirable that the base end portion BE be composed of a connector CN to which the harness EN can be attached and detached.

[0072] In this embodiment, as shown in Figure 8, the cable CA, which is electrically connected to the harness EN, is routed by being pulled out from inside the housing 56 through the notch 561C to the outside (downward). In other words, the cable CA extends from below the housing 56 through the notch 561C to the inside of the housing 56. This makes it possible to route the cable CA, which is pulled out from inside the housing 56, along the front wall 241 and the bottom surface 24D. From the viewpoint of realizing such cable CA routing, it is desirable to provide the notch 561C on the bottom surface 561 of the housing 56.

[0073] Furthermore, by routing the cable CA along the front wall portion 241 and the lower surface portion 24D, it becomes possible to route the cable CA without providing a through hole in the front wall portion 241 for the cable CA to pass through. Therefore, in terms of avoiding the need to provide an unnecessary through hole in the front wall portion 241, the configuration in which the cable CA is pulled downward from inside the housing portion 56 and routed along the lower surface portion 24D, as in this embodiment, is desirable. In other words, it is desirable that the cable CA extends from below the housing portion 56 into the housing portion 56 and connects to the connector CN (base end BE) of the housing portion 56 from the side opposite to the side connected to the harness EN.

[0074] As shown in Figures 6 and 7, the housing 56 has a main case 56a and a lid 56b. The main case 56a is a case with an open top and has the aforementioned front end 56F on its front surface. Therefore, the main case 56a has a base end BE, i.e., a connector CN. The lid 56b covers the main case 56a from above. The lid 56b is fixed to the main case 56a by fasteners 56b1 such as bolts. By loosening the fasteners 56b1, the lid 56b can be removed from the main case 56a.

[0075] By removing the lid 56b from the main case 56a, it becomes easier to connect cable CA to connector CN (from the side opposite to the side connected to harness EN) inside the housing section 56 (main case 56a). In this respect, it is desirable that the housing section 56 has a lid 56b that can be attached to and detached from the main case 56a.

[0076] [5. Routing of hydraulic hoses and control harnesses for the lift] Figure 9 is a perspective view of the front wall portion 241 as seen from the left arm 55L side. In addition to the opening 241P described above, the front wall portion 241 is provided with a lift hose insertion hole 241Q and a control harness insertion hole 241R. A lift hydraulic hose H11, which is connected to the lift cylinder 52, is inserted through the lift hose insertion hole 241Q. Therefore, the lift hydraulic hose H11 extends from the lower traveling body 2 towards the lift cylinder 52 side via the lift hose insertion hole 241Q.

[0077] The control harness EN3 is inserted through the control harness insertion hole 241R. The control harness EN3 is a solenoid valve control harness that transmits electrical signals from the control unit 61 (see Figure 2) to the solenoid valve 72 (see Figure 5). The electrical signals are control signals that switch the oil passage to either the angle cylinder 53 or the tilt cylinder 54. Therefore, the control harness EN3 extends from the lower traveling body 2 towards the blade 51 through the control harness insertion hole 241R.

[0078] As shown in Figure 9, the lift hose insertion hole 241Q and the control harness insertion hole 241R are positioned offset from each other in the vertical direction. Specifically, the control harness insertion hole 241R is positioned directly below the lift hose insertion hole 241Q. Therefore, the lift hose insertion hole 241Q and the control harness insertion hole 241R are positioned at the same location in the left-right direction on the front wall portion 241. In this case, the lift hydraulic hose H11 passing through the lift hose insertion hole 241Q and the control harness EN3 passing through the control harness insertion hole 241R are not dispersed in the left-right direction, but are instead compactly routed together in the vertical direction.

[0079] As shown in Figure 8, the control harness EN3 is routed below the aforementioned shared hydraulic hoses H1 and H2. From this, it can be said that the hydraulic hoses H (especially the shared hydraulic hoses H1 and H2) may be positioned above the harness EN (especially the control harness EN3).

[0080] [6. Regarding the configuration for guiding harness routing] Next, the configuration for guiding the routing of the harness EN connected to the base end BE will be explained based on Figures 3 and 10. Figure 10 is a plan view showing the front configuration of the lower traveling body 2.

[0081] The hydraulic excavator 1 of this embodiment further comprises a protective member 81, a support part 82, and a harness guide 83. The protective member 81 is a protective cover that protects the angle cylinder 53. The protective member 81 is provided corresponding to each of the left and right angle cylinders 53 and is arranged to cover the corresponding angle cylinder 53.

[0082] Specifically, the right-side protective member 81 extends in the front-rear direction along the right angle cylinder 53R and is positioned to cover the upper, lower, and right sides of the right angle cylinder 53R. The left-side protective member 81 extends in the front-rear direction along the left angle cylinder 53L (see Figure 10) and is positioned to cover the upper, lower, and left sides of the left angle cylinder 53L.

[0083] The support portion 82 is formed by bending a plate-shaped member and is attached to the left and right protective members 81 by bolts or the like. The harness guide 83 is supported by the support portion 82. In this embodiment, the harness guide 83 is formed in the shape of an elliptical ring with an elongated hole and is attached to the upper surface of the support portion 82 by welding or the like. The harness EN is guided through the elongated hole of the harness guide 83. In this embodiment, two harness guides 83 are provided on the support portion 82 in the front-rear direction, but the number of harness guides 83 to be installed is not particularly limited and may be one or three or more.

[0084] Furthermore, in this embodiment, in order to route the two first harnesses EN1 and second harnesses EN2 together, an elongated hole is provided in one harness guide 83, and the two first harnesses EN1 and second harnesses EN2 are passed through the elongated hole. However, it is also possible to provide one harness guide 83 corresponding to each of the two first harnesses EN1 and second harnesses EN2, and to pass each harness EN through one guide at a time.

[0085] In this embodiment, as shown in Figure 10, the harness EN extending forward from the lower traveling body 2 is routed to the lift cylinder 52 via the right arm 55R side. Therefore, the harness guide 83 is supported by the right-side support portion 82 to guide the routing of the harness EN. In other words, the harness guide 83 is supported by the support portion 82 attached to the right-side protective member 81 that protects the right angle cylinder 53R to guide the routing of the harness EN. The support portion 82 is attached to the right-side protective member 81 so as to cover at least above the connection portion of the hydraulic hose H (e.g., hydraulic hoses H21 and H22 for the right angle) in the right angle cylinder 53R.

[0086] In this way, the harness EN is guided by the harness guide 83 supported by the right-side support 82, thus reducing the risk of the harness EN coming into contact with the right-side angle cylinder 53R. Therefore, the risk of damage to at least one of the harness EN and the right-side angle cylinder 53R is reduced. Furthermore, the harness guide 83 can guide the harness EN to avoid contact with the lower hydraulic hoses H (e.g., the second hydraulic hose, the third hydraulic hose). This also reduces damage caused by contact between the harness EN and the hydraulic hoses H.

[0087] Furthermore, in this embodiment, as shown in Figure 10, the harness guide 83 is positioned so as to overlap with the right arm 55R, which is one of the arms 55, in a plan view. In this case, the harness EN guided by the harness guide 83 is routed above the right arm 55R. This reduces the risk of soil being kicked up from below during leveling work with the blade 51, for example, and thus reduces the risk of the soil hitting the harness EN. Consequently, damage to the harness EN due to kicked-up soil is reduced.

[0088] [7. Regarding the harness retention section] As shown in Figure 10, the hydraulic excavator 1 is equipped with a holding section 90. The holding section 90 is positioned in front of the lift cylinder 52 and behind the blade 51, and holds the harness EN. The holding section 90 includes a first holding section 91 and a second holding section 92. The first holding section 91 holds the first harness EN1. The second holding section 92 holds the second harness EN2. Details of the configuration of the holding section 90 (first holding section 91, second holding section 92) will be described later. By holding the harness EN with the holding section 90, the flapping of the harness EN due to changes in the attitude (position, tilt) of the blade 51 is suppressed.

[0089] In this embodiment, as shown in Figure 10, the harness EN extends from one arm 55 side (right arm 55R side) to the other arm 55 side (left arm 55L side) relative to the lift cylinder 52 in front of the holding part 90. In other words, in a plan view, both the first harness EN1 and the second harness EN2 are arranged diagonally with respect to the front-rear direction. In this case, as shown in Figure 10, the first holding part 91 and the second holding part 92 can be arranged side by side in the left-right direction, and they can also be arranged side by side in the front-rear direction. This increases the degree of freedom in the arrangement of the first holding part 91 and the second holding part 92.

[0090] Incidentally, if the harness EN is routed in the front-to-back direction in front of the retaining portion 90, it is possible to arrange the first retaining portion 91 and the second retaining portion 92 side by side in the left-to-right direction on the same plane, but it is not possible to arrange them side by side in the front-to-back direction (because the first retaining portion 91 and the second retaining portion 92 interfere with each other). In this embodiment, where the harness EN extends diagonally with respect to the front-to-back direction in a plan view, the restriction on arrangement that prevents the first retaining portion 91 and the second retaining portion 92 from being arranged side by side in the front-to-back direction is eliminated.

[0091] Furthermore, in a plan view, in a wiring configuration where the harness EN extends diagonally through the retaining portion 90, bending of the harness EN at the retaining portion 90 is avoided. This reduces the load (e.g., bending stress) applied to the harness EN at the retaining portion 90, thereby reducing damage to the harness EN due to the load.

[0092] In this embodiment, the first holding portion 91 is positioned to the left of the second holding portion 92. This is because, as shown in Figure 3, the target prism 512 is to the left of the attitude detection sensor 514, and the first harness EN1 can be smoothly guided to the target prism 512 in front of the holding portion 90 without crossing with the second harness EN2. If it is permissible for the first harness EN1 and the second harness EN2 to cross in front of the holding portion 90, the first holding portion 91 may be positioned to the right of the second holding portion 92. Also, in a plan view, the first holding portion 91 may be positioned in front of or behind the second holding portion 92.

[0093] In order to facilitate the holding of the first harness EN1 and the second harness EN2 by the first retaining part 91 and the second retaining part 92, respectively, without interfering with each other, it is desirable that the first retaining part 91 be positioned offset from the second retaining part 92 in the left-right or front-back direction, as in this embodiment.

[0094] [8. Details of the holding mechanism] Figure 11 is a perspective view showing the external appearance of the first retaining part 91, which constitutes the retaining part 90 described above. Figures 12A and 12B are exploded perspective views of the first retaining part 91. The configuration of the first retaining part 91 will be described below. Note that the second retaining part 92 has the same configuration as the first retaining part 91 except for the harness EN it holds, so its description will be omitted here.

[0095] The first holding part 91 comprises an elastic body 911 and a support body 912. The elastic body 911 is made of an elastic resin material such as rubber. The elastic body 911 has a through hole 911a through which the harness EN (for example, the first harness EN1) passes. The harness EN is partially formed in a coil shape to allow it to stretch and contract.

[0096] The elastic body 911 has a slit 911S. The slit 911S extends radially through the through hole 911a and communicates the inside of the through hole 911a with the outside of the elastic body 911.

[0097] The support 912 is a case that supports the elastic body 911 and has a receiving recess 912a for accommodating the elastic body 911. The elastic body 911 can be inserted into and removed from the receiving recess 912a from above. The support 912 is fixed to the connecting portion 551 (see Figure 10) by bolts or the like.

[0098] The procedure for holding the harness EN in the holding part 90 is as follows. First, as shown in Figure 13, the first harness EN1 is passed through the through hole 913a of the covering member 913. Then, a part of the covering member 913 is folded back toward the outer circumference of the coiled first harness EN1. The covering member 913 has a cylindrical shape and is made of a material that can be folded back as described above. For example, the covering member 913 may be made of resin, cloth, or a thin metal film.

[0099] Next, as shown in Figure 12A, the first harness EN1, covered with the covering member 913, is fitted into the through hole 911a of the elastic body 911 via the slit 911S. The elastic body 911 is elastically deformable and can be deformed, for example, in the direction of widening the slit 911S. By widening the slit 911S, the first harness EN1 can be fitted into the through hole 911a of the elastic body 911. Therefore, it is not necessary to insert the first harness EN1 into the through hole 911a from its end, and it becomes easy to hold the first harness EN1 with the elastic body 911.

[0100] Here, the covering member 913 is folded back in the direction of the outer circumference of the coil-shaped first harness EN1 as described above, and within the through hole 911a, it is folded back in a direction along the inner circumference of the through hole 911a. As a result, the gap between the inner surface of the through hole 911a of the elastic body 911 and the outer surface of the covering member 913 is filled by the folding of the covering member 913. This ensures that the first harness EN1 is held stably by the elastic body 911 without rattling.

[0101] Subsequently, as shown in Figure 12B, the elastic body 911 holding the first harness EN1 is inserted into the receiving recess 912a of the support 912. By fixing the support 912 to a predetermined position on the connecting portion 551 with bolts or the like, the first harness EN1 is routed through the first holding portion 91.

[0102] Figure 14 is a perspective view showing another configuration example of the holding part 90. As shown in Figure 14, the holding part 90 may be configured to simultaneously hold the first harness EN1 and the second harness EN2. Such a holding part 90 can be realized by preparing two elastic bodies 911 as shown in Figure 11, etc., and forming the receiving recess 912a of the support 912 to be vertically elongated. In other words, the holding part 90 shown in Figure 14 is realized by holding the first harness EN1 in one elastic body 911 and the second harness EN2 in the other elastic body 911, and arranging the two elastic bodies 911 vertically and housing them in the receiving recess 912a. Note that in the holding part 90 of Figure 14, it is possible to arbitrarily select which of the first harness EN1 and the second harness EN2 is positioned on top.

[0103] In the configuration shown in Figure 14, both the first harness EN1 and the second harness EN2 can be held by a single holding part 90. This is advantageous because it reduces the number of holding parts 90 compared to configurations such as those shown in Figure 11, where the first harness EN1 and the second harness EN2 are held individually by separate holding parts 90.

[0104] Furthermore, as shown in Figure 14, in a configuration where the holding part 90 holds the first harness EN1 and the second harness EN2 side by side in the vertical direction, the first harness EN1 and the second harness EN2 can be held in a space-saving manner in the front-to-back and left-to-right directions. For this reason, for example, in a small hydraulic excavator 1 where the installation space for the holding part 90 is limited, the configuration using the holding part 90 in Figure 14 to simultaneously hold the first harness EN1 and the second harness EN2 is advantageous.

[0105] The holding portion 90 may also be configured to simultaneously hold the first harness EN1 and the second harness EN2 side by side in an oblique direction intersecting the front-to-back direction when viewed from above.

[0106] [9. Supplement] The hydraulic excavator 1 is configured to be equipped with an engine 40 (see Figure 1) as the prime mover, but the prime mover may also be an electric motor.

[0107] The hydraulic excavator 1 may be configured to use both hydraulic equipment such as hydraulic actuators (e.g., hydraulic motors, hydraulic cylinders) and electrically driven actuators. Examples of electrically driven actuators include electric travel motors, electric cylinders, and electric slewing motors.

[0108] In this embodiment, a hydraulic excavator 1 was used as an example of the work machine, but the work machine is not limited to a hydraulic excavator 1 and may be construction machinery such as a mobile crane. Furthermore, the work machine may have a configuration in which the upper body does not rotate relative to the lower body.

[0109] [10. Addendum] The work machine (hydraulic excavator 1) described in this embodiment can be described as follows:

[0110] The work machines mentioned in Appendix (1) are: Lower body and A pair of left and right arms attached to the lower body and extending forward, A working machine comprising a blade attached to the tip of the aforementioned arm, A hydraulic hose extending from the lower body towards the blade, The system comprises a harness extending from the lower body towards the blade, The hydraulic hose extends along one arm and is positioned offset vertically from the harness.

[0111] The work machines in Appendix (2) are the work machines described in Appendix (1), The harness is routed above the hydraulic hose.

[0112] The work machines in Appendix (3) are the work machines described in Appendix (1) or (2), The system further includes a lift cylinder positioned between the pair of left and right arms, which raises and lowers the blade in the vertical direction. The harness is positioned on the side of one arm relative to the lift cylinder and extends from the lower body to the blade side.

[0113] The work machines in Appendix (4) are the work machines described in Appendix (1) or (2), The harness is positioned on one of the pair of left and right arms and extends from the lower body towards the blade.

[0114] The work machine in Appendix (5) is the work machine described in any of Appendix (1) to (4), An angle cylinder positioned to the side of one of the arms, which swings the left and right ends of the blade in the front-to-back direction, A protective member for protecting the angle cylinder, A support portion attached to the aforementioned protective member, The system further comprises a harness guide supported by the aforementioned support portion.

[0115] The work machines in Appendix (6) are the work machines described in Appendix (5), In a plan view, the harness guide is positioned to overlap with one of the arms.

[0116] The work machines in Appendix (7) are the work machines described in Appendix (3), The system further includes a retaining portion positioned in front of the lift cylinder and behind the blade, for holding the harness.

[0117] The work machines specified in Appendix (8) are the work machines described in Appendix (7), In front of the holding portion, the harness extends toward the other arm relative to the lift cylinder.

[0118] The work machines in Appendix (9) are the work machines described in Appendix (8), The harness includes a first harness and a second harness, The aforementioned retaining part is A first retaining part that holds the first harness, Includes a second retaining part that holds the second harness, The first holding portion is positioned offset from the second holding portion in the left-right or front-back direction.

[0119] The work machine in Appendix (10) is the work machine described in Appendix (7) or (8), The harness includes a first harness and a second harness, The holding portion holds the first harness and the second harness simultaneously.

[0120] The work machine in Appendix (11) is the work machine described in Appendix (10), The holding portion holds the first harness and the second harness side by side in the vertical direction.

[0121] The work machine in Appendix (12) is the work machine described in any of Appendix (9) to (11), The blade further comprises a target prism and an attitude detection sensor, The first harness is connected to the target prism, The second harness is connected to the attitude detection sensor.

[0122] The work machine in Appendix (13) is the work machine described in any of Appendix (1) to (4), An angle cylinder that swings the left and right ends of the blade in the front-to-back direction, A tilt cylinder that swings the left and right ends of the blade vertically, The angle cylinder and the tilt cylinder are further provided with a solenoid valve that switches the oil passage, The aforementioned hydraulic hose is It includes a first hydraulic hose extending from the lower body and connected to the solenoid valve.

[0123] The work machine in Appendix (14) is the work machine described in any of Appendix (7) to (11), The aforementioned retaining part is An elastic body having a through hole through which the harness passes, The system comprises a support that removably supports the elastic body, The elastic body has a slit that extends radially through the through hole and connects the inside of the through hole with the outside of the elastic body.

[0124] The work machine in Appendix (15) is the work machine described in Appendix (14), The holding portion further comprises a covering member having a passage hole through which the harness passes and positioned within the through hole, The covering member is positioned inside the through-hole with a portion of it folded back in a direction along the inner circumference of the through-hole.

[0125] Although embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and it can be expanded or modified without departing from the spirit of the invention. [Industrial applicability]

[0126] This invention can be used, for example, in work machinery such as construction machinery. [Explanation of Symbols]

[0127] 1. Hydraulic excavator (working machine) 2. Lower running body (lower body) 51 Blades 52 Lift Cylinder 53 Angle Cylinder 53L Left Angle Cylinder 53R Right Angle Cylinder 54 Tilt Cylinder 55 Arm 55L Left Arm 55R Right Arm 72 Solenoid valve 81 Protective component 82 Support part 83 Harness Guide 90 Holding part 91 1st holding part 92 Second holding part 512 Target Prism 514 Attitude detection sensor EN Harness EN1 First Harness EN2 Second Harness H Hydraulic Hose H1 Shared hydraulic hose (1st hydraulic hose) H2 Shared Hydraulic Hose (First Hydraulic Hose)

Claims

1. Lower body and A pair of left and right arms attached to the lower body and extending forward, A working machine comprising a blade attached to the tip of the aforementioned arm, A hydraulic hose extending from the lower body towards the blade, The system comprises a harness extending from the lower body towards the blade, The hydraulic hose extends along one arm and is positioned vertically offset from the harness in a working machine.

2. The work machine according to claim 1, wherein the harness is routed above the hydraulic hose.

3. The system further includes a lift cylinder positioned between the pair of left and right arms, which raises and lowers the blade in the vertical direction. The work machine according to claim 1, wherein the harness is positioned on the side of one arm relative to the lift cylinder and extends from the lower body to the blade side.

4. The work machine according to claim 1, wherein the harness is positioned on the side of one of the pair of left and right arms and extends from the lower body to the blade side.

5. An angle cylinder positioned to the side of one of the arms, which swings the left and right ends of the blade in the front-to-back direction, A protective member for protecting the angle cylinder, A support portion attached to the aforementioned protective member, The work machine according to claim 1, further comprising a harness guide supported by the support portion.

6. The work machine according to claim 5, wherein, in a plan view, the harness guide is positioned to overlap with one of the arms.

7. The work machine according to claim 3, further comprising a holding portion positioned in front of the lift cylinder and behind the blade, for holding the harness.

8. The work machine according to claim 7, wherein, in front of the holding portion, the harness extends toward the other arm side relative to the lift cylinder.

9. The harness includes a first harness and a second harness. The aforementioned retaining part is A first retaining part that holds the first harness, Includes a second retaining part that holds the second harness, The work machine according to claim 8, wherein the first holding portion is positioned offset from the second holding portion in the left-right or front-back direction.

10. The harness includes a first harness and a second harness. The work machine according to claim 7, wherein the holding part simultaneously holds the first harness and the second harness.

11. The work machine according to claim 10, wherein the holding part holds the first harness and the second harness side by side in the vertical direction.

12. The blade further comprises a target prism and an attitude detection sensor, The first harness is connected to the target prism, The work machine according to claim 9, wherein the second harness is connected to the attitude detection sensor.

13. An angle cylinder that swings the left and right ends of the blade in the front-to-back direction, A tilt cylinder that swings the left and right ends of the blade vertically, The angle cylinder and the tilt cylinder are further provided with a solenoid valve that switches the oil passage, The aforementioned hydraulic hose is The work machine according to any one of claims 1 to 4, further comprising a first hydraulic hose extending from the lower body and connected to the solenoid valve.

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