Work machine

Abstract

To easily route multiple cables extending from each sensor with a simple configuration with few relay sections, and to minimize an impact of connector installation on durability of a boom.SOLUTION: A work machine includes a boom having a base end and a tip end, the base end of which is rotatably supported on a machine body, an arm rotatably supported on the tip end of the boom, a first sensor for detecting an attitude of the boom, a second sensor for detecting an attitude of the arm, and a connector having an input side connected to a first cable extending from the first sensor and a second cable extending from the second sensor, and an output side connected to a main cable extending toward the base end. The boom has a bent portion that bends toward the arm midway as it extends from the base end to the tip end. The connector is located to the side of the bent portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] Conventionally, construction machines equipped with a work machine in which a wire harness (cable) is installed have been known. For example, in the construction machine disclosed in Patent Document 1, position detection sensors are provided on the boom and arm, and signals transmitted from each sensor are transmitted to the cab via a wire harness. The wire harness is supported on the work device by multiple relay units. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-54526 Summary of the Invention [Problem to be solved by the invention]

[0004] A work device (e.g., a boom) is subjected to loads (e.g., stress) during work such as excavation. For this reason, when multiple relay units are supported on the side of the work device, as in Patent Document 1, each relay unit must be installed to avoid positions where stress is concentrated. As a result, there is a problem in that the cables cannot be easily routed. In particular, when sensors are installed on the boom and arm and the cables extending from each sensor are relayed by relay units and led to the cab side, if there are a large number of relay units, the installation of the relay units has a significant impact on the durability of the boom, making the above problem more pronounced.

[0005] The present invention has been made to solve the above problems, and its object is to provide a work machine that can easily route multiple cables extending from each sensor using a simple configuration with few relay sections (connectors), and that can minimize the impact that the installation of connectors has on the durability of the boom. [Means for solving the problem]

[0006] A work machine according to one aspect of the present invention comprises a boom having a base end and a tip end, the base end being rotatably supported on a machine body, an arm rotatably supported on the tip end of the boom, a first sensor that detects the attitude of the boom, a second sensor that detects the attitude of the arm, and a connector having an input side connected to a first cable extending from the first sensor and a second cable extending from the second sensor, and having an output side connected to a main cable extending toward the base end, wherein the boom has a bent portion that bends toward the arm midway as it extends from the base end toward the tip end, and the connector is arranged to the side of the bent portion. [Effects of the Invention]

[0007] The multiple cables extending from each sensor can be easily routed using a simple configuration with few relay sections (connectors), and the impact of installing the connectors on the durability of the boom can be kept small. [Brief explanation of the drawings]

[0008] [Figure 1] 1 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] FIG. 2 is an enlarged side view of the boom of the hydraulic excavator. [Figure 3] FIG. 2 is a side view of the boom with the cover of the connector mounting portion removed. [Figure 4] FIG. 10 is a side view of the boom with a first support plate of the connector mounting portion removed. [Figure 5] FIG. 4 is an enlarged view of the connector and cables shown in FIG. 3. [Figure 6] FIG. 2 is a diagram showing the connector before the cables are connected. [Figure 7] FIG. 2 is an exploded view of the connector. [Figure 8] FIG. 2 is an enlarged side view showing the arm side from the bent portion of the boom. [Figure 9] FIG. 9 is a side view showing a part of the member shown in FIG. 8. [Figure 10] FIG. 2 is a perspective view of the boom as viewed obliquely from above. [Figure 11] FIG. 11 is an enlarged perspective view of part A in FIG. [Figure 12] FIG. 11 is a cross-sectional view of part A in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes an embodiment of the present invention with reference to the drawings.

[0010] [1. Work Machinery] 1 is a side view showing a schematic configuration of a hydraulic excavator 1, which is an example of a work machine according to this embodiment. The hydraulic excavator 1 includes a lower traveling structure 2, a work implement 3, and an upper rotating structure 4. In this specification, the upper rotating structure 4 may also be referred to as the "machine body."

[0011] Here, directions are defined as follows: The direction in which the operator (operator, driver) seated in the driver's seat 41a of the upper rotating body 4 faces forward is defined as the forward direction, and the opposite direction is defined as the rearward direction. Therefore, when the upper rotating body 4 is not rotating relative to the undercarriage 2 (swing angle 0°), the fore-and-aft direction of the upper rotating body 4 coincides with the direction in which the undercarriage 2 moves forward and backward. Also, the left side as seen from the operator seated in the driver's seat 41a is defined as the "left," and the right side is defined as the "right." Furthermore, the direction of gravity, which is perpendicular to the fore-and-aft direction and the left-and-right direction, is defined as the up-and-down direction, with the upstream side of the direction of gravity defined as the "up" and the downstream side as the "down." In the drawings, the hydraulic excavator 1 is shown in a state in which the upper rotating body 4 is not rotating relative to the undercarriage 2. Also, in the drawings, the forward direction is indicated by the symbols "F," the rearward by the symbol "B," the left by the symbol "L," the right by the symbol "R," the upward by the symbol "U," and the downward by the symbol "D."

[0012] (1-1. Undercarriage) The lower traveling structure 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. The left and right traveling motors 22 drive the left and right crawlers 21, respectively, to move the hydraulic excavator 1 forward and backward. The lower traveling structure 2 further includes a blade 23 for performing ground leveling work, and a blade cylinder 23a for rotating the blade 23 in the up and down direction.

[0013] (1-2. Upper rotating body) The upper rotating body 4 is located above the lower traveling body 2 and is rotatable relative to the lower traveling body 2. A driving unit 41, a rotating frame 42, a rotating motor 43, and a machine room 44 are arranged on the upper rotating body 4. The upper rotating body 4 rotates via a rotating bearing (not shown) driven by the rotating motor 43, which is a hydraulic motor. At the rear of the upper rotating body 4, an engine 40 that provides power to each unit and multiple hydraulic pumps (not shown) are arranged.

[0014] Each hydraulic pump supplies hydraulic oil (pressurized oil) to a hydraulic motor (for example, the left and right travel motors 22, the swing motor 43) and a hydraulic cylinder. The hydraulic cylinders include the above-mentioned blade cylinder 23a as well as the boom cylinder 31a, arm cylinder 32a, and bucket cylinder 33a, which will be described later. The above-mentioned hydraulic motors and hydraulic cylinders, which are driven by the supply of hydraulic oil from any hydraulic pump, are collectively called hydraulic actuators.

[0015] A driver's seat 41a is arranged in the driver's section 41. Various operation levers 41b are arranged around the driver's seat 41a. When an operator sits on the driver's seat 41a and operates the operation levers 41b, predetermined hydraulic actuators are driven.

[0016] The driver's section 41 includes a cabin 45. The cabin 45 covers the area above the driver's seat 41a and the surrounding areas on the front, rear, left and right sides. A canopy may be provided instead of the cabin 45. The canopy is erected at the upper rear of the engine room 44 and covers at least the area above the driver's seat 41a.

[0017] (1-3. Work equipment) The work implement 3 (hydraulic excavator 1) includes a boom 31, an arm 32, and a bucket 33. By independently driving the boom 31, the arm 32, and the bucket 33, it is possible to perform excavation work for earth and sand, etc. The bucket 33 is one of the attachments attached to the arm 32 via a link mechanism 34. Note that other attachments may be attached as appropriate instead of the bucket 33. For example, if a breaker is attached as another attachment, it is possible to perform crushing or demolition work using the breaker.

[0018] The work implement 3 (hydraulic excavator 1) includes a boom cylinder 31a, an arm cylinder 32a, and a bucket cylinder 33a. The boom 31, the arm 32, and the bucket 33 are driven by the boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a, respectively.

[0019] The boom 31 extends from a base end 311 toward a tip end 312. More specifically, the boom 31 extends from the base end 311 in one direction (e.g., upward in FIG. 1 ) and then bends at an obtuse angle in a direction intersecting the one direction (e.g., diagonally forward in FIG. 1 ) and extends toward the tip end 312. The bent portion of the boom 31 is referred to as a bent portion 313. The arm 32 is rotatably supported at the tip end 312 of the boom 31. In this way, the boom 31 has the base end 311 and the tip end 312, and also has the bent portion 313 that bends toward the arm 32 (forward) midway as it extends from the base end 311 toward the tip end 312.

[0020] The work machine 3 (hydraulic excavator 1) includes a first support portion 314 and a second support portion 315. The first support portion 314 is disposed above the bent portion 313 of the boom 31. The second support portion 315 is disposed on the opposite side of the bent portion 313 from the first support portion 314 (with the bent portion 313 in between). The first support portion 314 and the second support portion 315 are each fixed to the bent portion 313 by, for example, welding.

[0021] The base end 311 of the boom 31 is supported by an upper portion of a boom bracket 421. The boom bracket 421 is supported by a front portion 42a of the revolving frame 42 of the upper revolving body 4. In other words, the base end 311 of the boom 31 is supported by the machine body via the boom bracket 421.

[0022] The boom cylinder 31a is located forward of the boom 31. The boom cylinder 31a has one end 31a1 and the other end 31a2. The one end 31a1 of the boom cylinder 31a is supported at the tip of the boom bracket 421. In other words, the one end 31a1 of the boom cylinder 31a is supported on the machine body via the boom bracket 421, forward of the base end 311 of the boom 31. The other end 31a2 of the boom cylinder 31a is supported by the second support portion 315.

[0023] When the boom cylinder 31a extends and retracts, the boom 31 rotates up and down around the upper part of the boom bracket 421 on which the base end 311 is supported, as a rotation fulcrum. In this way, the hydraulic excavator 1 of this embodiment is provided with the boom 31 whose base end 311 is rotatably supported on the machine body via the boom bracket 421.

[0024] A swing cylinder 42b is connected to the boom bracket 421. The swing cylinder 42b is disposed on the revolving frame 42. The swing cylinder 42b is configured as a hydraulic cylinder. When the swing cylinder 42b extends and retracts, the boom 31 can be swung left and right via the boom bracket 421. In this way, the hydraulic excavator 1 of this embodiment has a boom swing function.

[0025] The arm 32 is rotated up and down by the extension and contraction of the arm cylinder 32a. The arm cylinder 32a has a first end 32a1 and a second end 32a2. The first end 32a1 of the arm cylinder 32a is supported by the first support part 314. The second end 32a2 of the arm cylinder 32a is connected to (the base end of) the arm 32.

[0026] The bucket 33 is connected to the tip of the arm 32 via a link mechanism 34, and is rotated up and down by the extension and contraction of a bucket cylinder 33a. The bucket cylinder 33a has a base end supported by the arm 32 and a tip end connected to the link mechanism 34 so as to extend and contract.

[0027] The hydraulic excavator 1 is equipped with a first sensor 35, a second sensor 36, and a third sensor 37. The first sensor 35 is attached to the boom 31 and detects the attitude of the boom 31. The second sensor 36 is attached to the arm 32 and detects the attitude of the arm 32. The third sensor 37 is attached to the link mechanism 34 and detects the attitude of the attachment attached to the tip side of the arm 32 via the link mechanism 34. In this example, the third sensor 37 detects the attitude of the bucket 33 serving as an attachment.

[0028] The first sensor 35, the second sensor 36, and the third sensor 37 are configured as inertial measurement units (IMUs). The inertial measurement units are devices equipped with a three-axis gyro sensor and a three-directional accelerometer. This enables the first sensor 35, the second sensor 36, and the third sensor 37 to detect the three-dimensional positions of the boom 31, the arm 32, and the bucket 33, respectively.

[0029] Information about the attitudes of the boom 31, arm 32, and bucket 33 detected by the first sensor 35, second sensor 36, and third sensor 37 is input to a controller (not shown) arranged on the machine body side via a first cable 71 (see FIG. 3), a second cable 72, and a third cable 73, respectively. This allows the controller to detect the position of the cutting edge of the bucket 33 (positions in the front-to-back, up-down, and left-to-right directions) based on the information about the attitudes of the boom 31, arm 32, and bucket 33. The first cable 71, second cable 72, and third cable 73 are connected to a connector 6 (see FIG. 3). The connector 6 is attached to a connector attachment portion 5. Details of the connector attachment portion 5 and the connector 6 will be described later.

[0030] Position information about the cutting edge of the bucket 33 is displayed, for example, on a monitor (not shown) located within the driver's unit 41. This allows the operator to operate the control lever 41b so that the bucket 33 is in the desired position based on the information displayed on the monitor. In other words, in this case, machine guidance can be achieved that presents the position information to the operator and guides the operation of the work implement 3. It is also possible to achieve machine control in which a controller automatically operates the work implement 3 so that the cutting edge of the bucket 33 is in the desired position based on the detected position information of the cutting edge of the bucket 33.

[0031] If the hydraulic excavator 1 has a boom swing function as in this embodiment, a swing boom sensor may be attached to the boom bracket 421. The swing boom sensor is a sensor that detects the swing angle of the boom 31, and is configured, for example, by an inertial measurement unit. By inputting information (swing angle) detected by the swing boom sensor to the controller via a cable (not shown), the controller can accurately detect the position of the cutting edge of the bucket 33, further taking into account the swing angle of the boom 31.

[0032] [2. Connector mounting section] 2 is an enlarged side view of the boom 31. As shown in the drawing, a connector mounting portion 5 is provided on the left side of the boom 31. The connector mounting portion 5 may also be provided on the right side of the boom 31.

[0033] The connector mounting portion 5 has a cover 5a, a first support plate 5b (see FIG. 3), and a mounting seat 5c (see FIG. 4). FIG. 3 is a side view of the boom 31 with the cover 5a removed. The cover 5a in FIG. 2 is detachably attached to the first support plate 5b. A connector 6 is attached to the first support plate 5b, for example, by bolting. The cover 5a is provided for the purpose of protecting the connector 6. In this way, the hydraulic excavator 1 is provided with the connector 6 attached to the first support plate 5b.

[0034] FIG. 4 is a side view of the boom 31 with the first support plate 5b (see FIG. 3) removed. For convenience, the outline of the first support plate 5b before removal is shown by a dashed line in FIG. 4. A mounting seat 5c made of a flat metal plate is attached to the side surface 31S of the boom 31 by, for example, welding. In particular, the mounting seat 5c is attached to the left side surface 31S of the bent portion 313 of the boom 31. The first support plate 5b shown in FIG. 3 is fixed to the mounting seat 5c by, for example, bolting. That is, the mounting seat 5c for fixing the first support plate 5b is provided on the side surface 31S of the bent portion 313 of the boom 31.

[0035] By fixing the first support plate 5b to the mounting seat 5c, the first support plate 5b is supported via the mounting seat 5c on the side surface 31S of the bent portion 313 of the boom 31. The hydraulic excavator 1 is provided with such a first support plate 5b.

[0036] 3, by attaching the connector 6 to the first support plate 5b, the connector 6 is disposed to the side of the bent portion 313 of the boom 31. In particular, in this embodiment, the mounting seat 5c of the connector mounting portion 5 is fixed to the left side surface 31S of the boom 31, so the connector 6 is disposed on the left side of the boom 31. Note that if the mounting seat 5c were fixed to the right side surface of the boom 31, the connector 6 would be disposed on the right side of the boom 31.

[0037] [3. About the connector] 5 is an enlarged view of the connector 6 and the cables shown in FIG. 3, that is, the connector 6 and the cables as viewed from the side of the boom 31. A main cable 70, a first cable 71, a second cable 72, and a third cable 73 are connected to the connector 6.

[0038] The first cable 71 is a cable extending from the first sensor 35 (see FIGS. 1 to 3). The second cable 72 is a cable extending from the second sensor 36 (see FIG. 1). The third cable 73 is a cable extending from the third sensor 37 (see FIG. 1). The first cable 71, the second cable 72, and the third cable 73 are each connected to different terminals on the input side of the connector 6.

[0039] The first sensor 35 and the connector 6 are connected by a single first cable 71. Therefore, the first cable 71 does not have any relay points along the way where cables are connected to each other. Similarly, the second sensor 36 and the connector 6 are connected by a single second cable 72. Therefore, the second cable 72 does not have any relay points along the way where cables are connected to each other. Furthermore, the third sensor 37 and the connector 6 are connected by a single third cable 73. Therefore, the third cable 73 does not have any relay points along the way where cables are connected to each other.

[0040] The main cable 70 is a cable connected to the output side of the connector 6. The main cable 70 extends from the connector 6 toward the base end portion 311 of the boom 31, and is connected to the controller of the driving unit 41 (see FIG. 1).

[0041] The main cable 70 may be configured by bundling together a wire electrically connected to the first cable 71 via the connector 6, a wire electrically connected to the second cable 72 via the connector 6, and a wire electrically connected to the third cable 73 via the connector 6. The main cable 70 may also be configured as a cable (CAN bus) capable of CAN (Controller Area Network) communication.

[0042] Fig. 6 is a diagram of the connector 6 before the cables are connected, as seen from the side of the boom 31. Fig. 7 is an exploded view of the connector 6 of Fig. 6. As shown in these figures, the connector 6 has a first connector 61, a second connector 62, a third connector 63, and a fourth connector 64.

[0043] The first connector 61 has a first terminal 611, a second terminal 612, and a third terminal 613. The first terminal 611 is arranged on the input side of the first connector main body 610. The second terminal 612 is arranged on the input side of the first connector main body 610 and is arranged next to the first terminal 611. The third terminal 613 is arranged on the output side of the first connector main body 610.

[0044] The second connector 62 has a fourth terminal 621, a fifth terminal 622, and a sixth terminal 623. The fourth terminal 621 is arranged on the input side of the second connector main body 620. The fifth terminal 622 is arranged on the input side of the second connector main body 620 and is arranged next to the fourth terminal 621. A first cable 71 (see FIG. 5) is connected to the fourth terminal 621. A second cable 72 (see FIG. 5) is connected to the fifth terminal 622. The sixth terminal 623 is arranged on the output side of the second connector main body 620. The sixth terminal 623 fits into and is electrically connected to the first terminal 611 of the first connector 61. That is, the connector 6 has a second connector 62 that electrically connects the first cable 71 and the second cable 72 to the first terminal 611 of the first connector 61.

[0045] The third connector 63 has a seventh terminal 631 on the input side of the third connector main body 630 and an eighth terminal 632 on the output side. A third cable 73 (see FIG. 5) is connected to the seventh terminal 631. The eighth terminal 632 fits into and is electrically connected to the second terminal 612 of the first connector 61. In other words, the connector 6 has the third connector 63 that electrically connects the third cable 73 to the second terminal 612 of the first connector 61.

[0046] The fourth connector 64 has a ninth terminal 641 on the input side of the fourth connector main body 640 and a tenth terminal 642 on the output side. The ninth terminal 641 fits into and is electrically connected to the third terminal 613 of the first connector 61. The tenth terminal 642 is connected to the main cable 70 (see FIG. 5).

[0047] In the above-described configuration of the connector 6, posture information of the boom 31 transmitted from the first sensor 35 via the first cable 71 is transmitted to the controller via the second connector 62 (fourth terminal 621), the first connector 61 (first terminal 611), the fourth connector 64, and the main cable 70. Posture information of the arm 32 transmitted from the second sensor 36 via the second cable 72 is transmitted to the controller via the second connector 62 (fifth terminal 622), the first connector 61 (first terminal 611), the fourth connector 64, and the main cable 70. Posture information of the bucket 33 transmitted from the third sensor 37 via the third cable 73 is transmitted to the controller via the third connector 63, the first connector 61 (second terminal 612), the fourth connector 64, and the main cable 70.

[0048] As shown in FIG. 3, the connector 6 is disposed to the side of the bending portion 313 of the boom 31. In a configuration in which at least the first cable 71, the second cable 72, and the main cable 70 are connected to one connector 6 as in this embodiment, the connector 6 is the only relay point between the first cable 71 and the second cable 72 and the main cable 70. In other words, the relay points for multiple cables are concentrated in one location. This makes it possible to reduce the number of relay points (relay sections) compared to a configuration in which multiple relay points (relay sections) are provided to connect multiple cables together. In addition, a cable connecting adjacent relay sections is not required. Therefore, it is possible to easily route multiple cables with a simple configuration with a small number of parts.

[0049] Moreover, the bent portion 313 of the boom 31 is a bending portion of the boom 31, and is a location where stress (especially stress due to torsion) generated during work is less likely to concentrate. In other words, the bent portion 313 is less likely to be subjected to loads generated during work. By arranging the connector 6 on the side of the bent portion 313 of the boom 31, which is less likely to be subjected to loads during work, the impact of installing the connector 6 on the durability of the boom 31 can be kept small.

[0050] 3, the connector 6 is disposed below the first support part 314 fixed to the boom 31 and behind the second support part 315. This ensures that the connector 6 is disposed at (the side of) the bent part 313, which is less susceptible to stress during work.

[0051] When arranging the connector 6 at (the side of) the bent portion 313 between the arm cylinder 32a and the base end 311 of the boom 31, it is desirable to arrange the connector 6 in the following orientation, from the viewpoint of facilitating the routing of the first cable 71, the second cable 72, and the main cable 70 connected to the connector 6. That is, as shown in Figures 3 and 5, it is desirable that the input side of the connector 6 (the connection side of the first cable 71 and the second cable 72) is on the arm cylinder 32a side, and the output side of the connector 6 (the connection side of the main cable 70) is on the base end 311 side.

[0052] In this embodiment, the first support plate 5b to which the connector 6 is attached is supported (via the mounting seat 5c) on the side surface 31S of the bent portion 313 of the boom 31. This makes it easy to realize a configuration in which the connector 6 is disposed on the side of the bent portion 313 where stress is less likely to concentrate during work.

[0053] In particular, in this embodiment, the mounting seat 5c is provided on the side surface 31S of the bent portion 313 of the boom 31. As a result, the first support plate 5b is reliably supported (fixed) to the side surface 31S of the boom 31 via the mounting seat 5c.

[0054] 1 and 5, the third cable 73 extending from the third sensor 37 is connected to the input side of the connector 6. In other words, the third cable 73 is connected to the same side of the connector 6 as the connection side of the first cable 71 and the second cable 72. In further other words, the third cable 73 is connected to the side of the connector 6 opposite to the connection side (output side) of the main cable 70.

[0055] Even in a configuration in which an attachment (e.g., bucket 33), a third sensor 37, and a third cable 73 are provided as in this embodiment, the relay points of multiple cables including the third cable 73 are consolidated into one location, the connector 6. This makes it possible to easily route multiple cables with a simple configuration having a small number of parts.

[0056] 7, in a configuration in which the connector 6 has the third connector 63 in addition to the first connector 61 and the second connector 62, the third cable 73 extending from the third sensor 37 is electrically connected to the first connector 61 via the third connector 63. This makes it possible to configure the third connector 63 as a terminator (termination resistor) and reduce radio interference.

[0057] [4. Routing of the second cable] Fig. 8 is an enlarged side view showing the arm 32 side from the bent portion 313 of the boom 31. Fig. 9 is a side view showing a part of the member shown in Fig. 8. The second cable 72 described above is routed along the edge 31E (see Fig. 9) on the arm cylinder 32a side of the side surface 31S of the boom 31.

[0058] Here, FIG. 10 is a perspective view of the boom 31 as seen obliquely from above. FIG. 11 is an enlarged perspective view of part A in FIG. 10. FIG. 12 is a cross-sectional view of part A in FIG. 10 cut along a plane along the left-right direction, in other words, a plane perpendicular to the direction in which hydraulic hoses H, described below, extend. As shown in these figures, a plurality of hydraulic hoses H are routed above the boom 31. The plurality of hydraulic hoses H includes, for example, a hydraulic hose connected to the bucket cylinder 33a (see FIG. 1). The plurality of hydraulic hoses H may also include PTO (Power Take Off) piping. Here, the PTO piping is an optional piping (service piping) that supplies hydraulic oil to an attachment other than the bucket 33 when that attachment is attached to the work machine 3. For example, a plurality of PTO piping may be provided, but the number of PTO piping can be set as desired.

[0059] The multiple hydraulic hoses H are sandwiched between a fixed plate 317 and a fastener 318 via an upper and lower divided elastic body 316 (e.g., a rubber body). The fixed plate 317 is fixed to the top of the boom 31. The fastener 318 is disposed higher than the fixed plate 317. A bolt 318a is inserted from above into a hole in the top surface of the fastener 318, passes through the elastic body 316, and is screwed into the hole in the fixed plate 317. This allows the multiple hydraulic hoses H to be stably held above the boom 311.

[0060] By arranging the second cable 72 along the edge 31E of the boom 31, it is possible to support the second cable 72 using a fastener 318 that holds down multiple hydraulic hoses H. For example, as shown in FIGS. 11 and 12 , one end (e.g., the left end) of the fastener 318 is extended downward from above the boom 31 along the side surface 31S, and a support member 319 that supports hydraulic piping P, which will be described later, is fixed to the fastener 318. In this way, the second cable 72 can be supported from below by the support member 319. In this case, it is not necessary to attach a member (harness guide) that supports the second cable 72 to the side surface 31S of the boom 31, which is likely to be subjected to stress during work. Therefore, it is possible to avoid a decrease in durability of the boom 31 that would be caused by attaching a harness guide to the side surface 31S of the boom 31.

[0061] [5. Hydraulic piping layout on the side of the boom] As shown in Fig. 8 and other figures, the hydraulic excavator 1 is equipped with hydraulic piping P routed along the side surface 31S of the boom 31. The hydraulic piping P is, for example, a PTO piping, and is supported by a support member 319. As shown in Fig. 8, the hydraulic piping P is routed from the rear of the connector 6 (the opposite side of the connector 6 from the arm 32) to above.

[0062] When the hydraulic piping P is routed in this manner, the hydraulic piping P along the side surface 31S of the boom 31 and the second cable 72 connected to the connector 6 can be routed close to each other. As a result, as shown in FIG. 12 , the hydraulic piping P and the second cable 72 can be supported by a support member 319 attached to a fastener 318. In other words, the hydraulic piping P and the second cable 72 can be supported using the same fastener 318. Therefore, the routing of the hydraulic piping P and the routing of the second cable 72 can be easily achieved at the same time. In particular, when the hydraulic piping P is a PTO piping, the PTO piping is often arranged along the side surface 31S of the boom 31. Therefore, when the hydraulic piping P is a PTO piping, routing the hydraulic piping P passing from the rear of the connector 6 above is very effective from the viewpoint of easily routing the hydraulic piping P and the second cable 72 at the same time.

[0063] [6. Installing the first sensor] 8 and other figures, the first sensor 35 is disposed below the hydraulic piping P on the side surface 31S of the boom 31. The first sensor 35 is disposed in front of and above the connector 6.

[0064] On the side surface 31S of the boom 31, below the hydraulic piping P, there is an empty space in front of and above the connector 6. From the perspective of making effective use of this space, it is desirable to place the first sensor 35 that detects the posture of the boom 31 in this space. Note that the connector 6 is placed to the side of the bent portion 313 of the boom 31, and as mentioned above, stress is less likely to concentrate on the bent portion 313 during work. The space can be considered to be included in the bent portion 313 where stress is less likely to concentrate. Therefore, by placing the first sensor 35 in the space on the side surface 31S of the boom 31, the impact of installing the first sensor 35 on the durability of the boom 31 can be kept small.

[0065] 8, the first sensor 35 is attached to the second support plate 35a. The second support plate 35a extends from above the first support plate 5b toward the arm 32 (toward the tip end 312, forward). The second support plate 35a is attached to the side surface 31S of the boom 31 by, for example, welding. That is, the second support plate 35a is supported by the side surface 31S of the boom 31.

[0066] The first support plate 5b of the connector mounting portion 5 and the second support plate 35a are arranged side by side on the side surface 31S of the boom 31. As a result, when the connector 6 is attached to the first support plate 5b and the first sensor 35 is attached to the second support plate 35a, the connector 6 and the first sensor 35 are arranged side by side on the side of the bent portion 313. In this way, the connector 6 and the first sensor 35 are arranged on the side of the bent portion 313 where stress is less likely to concentrate during work, and therefore the impact of the installation of the connector 6 and the first sensor 35 on the durability of the boom 31 is kept small.

[0067] [7. Supplementary Information] The hydraulic excavator 1 may be configured to use hydraulic equipment such as hydraulic actuators (e.g., hydraulic motors and hydraulic cylinders) in combination with electrically driven actuators. Electrically driven actuators include, for example, electric travel motors, electric cylinders, and electric swing motors.

[0068] The hydraulic excavator 1 is configured to include an engine 40 (see FIG. 1) as a prime mover, but the prime mover may also be an electric motor.

[0069] [8. Notes] The work machine described in this embodiment can be expressed as follows:

[0070] The work machine in Appendix (1) is a boom having a base end and a tip end, the base end being rotatably supported on the machine body; an arm rotatably supported on the tip portion of the boom; a first sensor that detects the attitude of the boom; a second sensor that detects the posture of the arm; a connector to which a first cable extending from the first sensor and a second cable extending from the second sensor are connected on an input side, and to which a main cable extending toward the base end is connected on an output side, the boom has a bending portion that bends toward the arm midway along the extension from the base end portion toward the tip end portion, The connector is disposed on the side of the bent portion.

[0071] The work machine of supplementary note (2) is the work machine of supplementary note (1), a first support portion disposed above the bent portion; an arm cylinder having a first end supported by the first support portion and a second end connected to the arm; a second support portion disposed on the opposite side of the bent portion from the first support portion; a boom cylinder having one end supported on the aircraft body forward of the base end of the boom and the other end supported on the second support portion, The connector is disposed below the first support portion and rearward of the second support portion.

[0072] The work machine of supplementary note (3) is the work machine of supplementary note (2), the input side of the connector is the arm cylinder side, The output side of the connector is on the base end side of the boom.

[0073] The work machine of supplementary note (4) is a work machine according to supplementary note (2) or (3), The second cable is routed along the edge of the side surface of the boom on the arm cylinder side.

[0074] The work machine of supplementary note (5) is a work machine according to any one of supplementary notes (1) to (4), Further, hydraulic piping is arranged along the side of the boom, The hydraulic piping is routed from the rear to the upper part of the connector.

[0075] The work machine of supplementary note (6) is the work machine according to supplementary note (5), The first sensor is disposed on the side surface of the boom below the hydraulic piping and in front of and above the connector.

[0076] The work machine of supplementary note (7) is the work machine according to supplementary note (6), a first support plate supported on the side surface of the bent portion of the boom; The connector is attached to the first support plate.

[0077] The work machine of supplementary note (8) is the work machine according to supplementary note (7), A mounting seat for fixing the first support plate is provided on the side surface of the bent portion of the boom.

[0078] The work machine of supplementary note (9) is a work machine according to supplementary note (7) or (8), a second support plate to which the first sensor is attached; The second support plate extends from above the first support plate toward the arm and is supported by the side surface of the boom.

[0079] The work machine of supplementary note (10) is a work machine according to any one of supplementary notes (1) to (9), an attachment attached to the tip side of the arm; a third sensor that detects the attitude of the attachment; a third cable extending from the third sensor; The third cable is connected to the input side of the connector.

[0080] The work machine of supplementary note (11) is the work machine according to supplementary note (10), The connector comprises: a first connector having a first terminal and a second terminal disposed adjacent to the first terminal; a second connector that connects the first cable and the second cable to the first terminal of the first connector; and a third connector that connects the third cable to the second terminal of the first connector.

[0081] Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these, and the invention can be expanded or modified without departing from the spirit of the invention. [Industrial Applicability]

[0082] The present invention can be used in work machines such as construction machines. [Explanation of symbols]

[0083] 1. Hydraulic excavator (work machine) 4 Upper rotating body (aircraft) 5b 1st support plate 5c Mounting seat 6 Connectors 31 Boom 31E Edge 31S side 31a Boom cylinder 31a1 One end 31a2 Other end 32 Arm 32a Arm cylinder 32a1 1st end 32a2 2nd end 33 Bucket (attachment) 35 First Sensor 35a 2nd support plate 36 Second sensor 37 Third Sensor 61 First Connector 62 Second Connector 63 Third Connector 70 Main Cable 71 First Cable 72 Second Cable 73 Third Cable 311 Proximal end 312 Tip 313 Bend 314 1st support part 315 Second support part 611 1st terminal 612 2nd terminal P Hydraulic piping

Claims

1. a boom having a base end and a tip end, the base end being rotatably supported on the machine body; an arm rotatably supported on the tip portion of the boom; a first sensor that detects the attitude of the boom; a second sensor that detects the posture of the arm; a connector to which a first cable extending from the first sensor and a second cable extending from the second sensor are connected at an input side, and to which a main cable extending toward the base end is connected at an output side, the boom has a bending portion that bends toward the arm midway along the extension from the base end portion toward the tip end portion, The connector is disposed on the side of the bent portion.

2. a first support portion disposed above the bent portion; an arm cylinder having a first end supported by the first support portion and a second end connected to the arm; a second support portion disposed on the opposite side of the bent portion from the first support portion; a boom cylinder having one end supported on the aircraft body forward of the base end of the boom and the other end supported on the second support portion, The work machine according to claim 1 , wherein the connector is disposed below the first support portion and rearward of the second support portion.

3. the input side of the connector is the arm cylinder side, The work machine according to claim 2 , wherein the output side of the connector is on the base end side of the boom.

4. The work machine according to claim 2 , wherein the second cable is routed along an edge of the side surface of the boom on the arm cylinder side.

5. Further, hydraulic piping is arranged along the side of the boom, The work machine according to claim 1 , wherein the hydraulic pipe is routed from rearward to above the connector.

6. The work machine according to claim 5 , wherein the first sensor is disposed on the side of the boom below the hydraulic pipe and in front of and above the connector.

7. a first support plate supported on the side surface of the bent portion of the boom; The work machine of claim 6 , wherein the connector is attached to the first support plate.

8. The work machine according to claim 7 , wherein a mounting seat for fixing the first support plate is provided on the side surface of the bent portion of the boom.

9. a second support plate to which the first sensor is attached; The work machine according to claim 7 , wherein the second support plate extends from above the first support plate toward the arm and is supported on the side surface of the boom.

10. an attachment attached to the tip side of the arm; a third sensor that detects the attitude of the attachment; a third cable extending from the third sensor; The work machine according to claim 1 , wherein the third cable is connected to the input side of the connector.

11. The connector comprises: a first connector having a first terminal and a second terminal disposed adjacent to the first terminal; a second connector that connects the first cable and the second cable to the first terminal of the first connector; A third connector connecting the third cable to the second terminal of the first connector.

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