Working machinery

Abstract

To provide a work machine allowing to take out arrangement members passing through inside a work tool to outside the work tool, while suppressing degradation of strength of the work tool.SOLUTION: A hydraulic shovel as a work machine has a work tool having a first opening on one face and a reinforcement part fitted to the work tool and having a second opening. The reinforcement part is fitted to a position where the first opening and the second opening overlap in relation to the work tool.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a working machine such as a hydraulic excavator.

Background Art

[0002] For example, Patent Document 1 discloses a structure in which a hydraulic oil pipe (hydraulic hose) is inserted inside a boom of a hydraulic excavator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the hydraulic hose is for PTO (Power Take-Off) that supplies hydraulic oil to an attachment such as a breaker, in the structure of Patent Document 1, it is necessary to provide an opening on one side (for example, the side surface) of the boom to draw out the PTO hydraulic hose from the inside of the boom. For this reason, there is a concern about a decrease in the strength of the boom.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a working machine capable of taking out a piping member passing through the inside of a working tool to the outside of the working tool while suppressing a decrease in the strength of the working tool such as a boom.

Means for Solving the Problems

[0006] A working machine according to one aspect of the present invention includes a working tool having a first opening on one surface, and a reinforcing portion attached to the working tool and having a second opening, and the reinforcing portion is attached to the working tool at a position where the first opening and the second opening overlap.

Effects of the Invention

[0007] According to the above configuration, it is possible to suppress a decrease in the strength of the work tool while allowing the routing member that passes through the inside of the work tool to be brought out from one side of the work tool to the outside. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing the schematic configuration of a hydraulic excavator, which is an example of a work machine according to one embodiment of the present invention. [Figure 2] This is a magnified perspective view showing the mounting portion of the reinforcement section on the boom of the hydraulic excavator described above. [Figure 3] This is a perspective view showing a further enlarged view of the mounting area described above. [Figure 4] This is a cross-sectional view of the boom and the reinforcing section when cut along a predetermined plane. [Figure 5] This is a cross-sectional view of the boom and the reinforcing part described above, where the outer opening and the inner opening are offset from each other. [Figure 6] This is a cross-sectional view showing other components of the reinforcement part described above. [Figure 7] This is a cross-sectional view showing another mounting structure for the reinforced portion described above. [Figure 8] This is a cross-sectional view showing other configurations of the guide portion of the reinforcement portion described above. [Figure 9] This is a cross-sectional view showing yet another configuration of the reinforcement part described above. [Figure 10] This is a cross-sectional view showing other configurations of the joint in the reinforced section described above. [Figure 11] This is a cross-sectional view showing yet another configuration of the reinforcement part described above. [Figure 12] This is a cross-sectional view showing yet another configuration of the reinforcement part described above. [Modes for carrying out the invention]

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

[0010] [1. Outline of the configuration of the work machine] 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] In this embodiment, direction is defined as follows: The direction in which the operator (driver, operator) seated in the driver's seat 41a inside the control section 41 of the upper slewing body 4 faces forward is defined as forward, and the opposite direction is defined as rear. Therefore, when the upper slewing body 4 is not slewing relative to the lower traveling body 2 (slewing angle 0°), the front-rear 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 front-rear 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 drawing, the hydraulic excavator 1 is shown with the upper slewing body 4 not slewing relative to the lower traveling body 2. Also, in the drawing, the forward direction is indicated by the symbol "F," the rear by "B," the right by "R," the left by "L," the upper by "U," and the lower by "D," as needed.

[0012] The lower traveling body 2 is driven by power from the engine 40 to move the hydraulic excavator 1. The lower traveling body 2 is equipped with a pair of left and right crawlers 21 and a pair of left and right travel motors 22. Each travel motor 22 is a hydraulic motor. The left and right travel motors 22 drive the left and right crawlers 21 respectively, allowing the hydraulic excavator 1 to move forward and backward. The lower traveling body 2 is equipped with a blade 23 for leveling work and a blade cylinder 23a. The blade cylinder 23a is a hydraulic cylinder that rotates the blade 23 in the vertical direction.

[0013] The work machine 3 is driven by power from the engine 40 and performs excavation work to dig up soil and other materials. The work machine 3 is equipped with a boom 31, an arm 32, and a bucket 33. Excavation work can be performed by independently driving the boom 31, arm 32, and bucket 33.

[0014] The boom 31 is rotated by the boom cylinder 31a. The base end of the boom cylinder 31a is supported at the front part of the upper revolving body 4 and is movable in an extendable and retractable manner. The boom cylinder 31a is disposed on the back side (the side of the control section 41) of the boom 31. Incidentally, the boom cylinder 31a may be disposed on the front side of the boom 31 (the side opposite to the control section 41 with respect to the boom 31).

[0015] The arm 32 is rotated by the arm cylinder 32a. The base end of the arm cylinder 32a is supported near a bent portion 31d of the boom 31, which will be described later, and is movable in an extendable and retractable manner. The bucket 33 is rotated by the bucket cylinder 33a. The base end of the bucket cylinder 33a is supported near the base end of the arm 32 and is movable in an extendable and retractable manner. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are constituted by hydraulic cylinders.

[0016] The upper revolving body 4 is configured to be rotatable with respect to the lower traveling body 2 via a slewing bearing (not shown). The upper revolving body 4 is provided with a control section 41, a turntable 42, a slewing motor 43, an engine room 44, etc. The control section 41 and the engine room 44 are disposed on the turntable 42. The upper revolving body 4 rotates via the slewing bearing by the drive of the slewing motor 43, which is a hydraulic motor. Inside the engine room 44, in addition to the above-described engine 40 that provides power to each part, a plurality of hydraulic pumps (not shown) are disposed.

[0017] Each hydraulic pump supplies hydraulic oil (pressure oil) to hydraulic motors (for example, left and right traveling motors 22, slewing motor 43) and hydraulic cylinders (for example, blade cylinder 23a, boom cylinder 31a, arm cylinder 32a, bucket cylinder 33a). Hydraulic motors and hydraulic cylinders that are driven by the supply of hydraulic oil from an arbitrary hydraulic pump are collectively referred to as hydraulic actuators.

[0018] A driver's seat 41a is located in the control unit 41 where the operator sits. An operating unit 41b is located around the driver's seat 41a. The operating unit 41b consists of operating levers, switches, buttons, etc., for driving the hydraulic actuator. When the operator sits in the driver's seat 41a and operates the operating unit 41b, the hydraulic actuator is driven. This enables the lower traveling body 2 to travel, leveling work with the blade 23, excavation work with the work equipment 3, lifting work, rotation of the upper rotating body 4, etc.

[0019] [2. Regarding the routing and reinforcement of the PTO hose] The hydraulic excavator 1 of this embodiment is a PTO specification. A PTO specification means that an attachment such as a breaker can be attached to the end of the arm 32 in place of the bucket 33, and work can be performed by driving the attachment. In a PTO specification, a hydraulic hose is routed to supply hydraulic fluid to the attachment. The above hydraulic hose is referred to here as the PTO hose 51. The PTO hose 51 is a type of routing member 50 and is connected to the PTO section of a control valve (not shown) provided on the upper slewing body 4. When using the attachment, the hydraulic hose on the attachment side is connected to the end of the PTO hose 51 (stop valve). By supplying hydraulic fluid to the attachment via the control valve and the PTO hose 51, the attachment can be driven.

[0020] Incidentally, as mentioned above, the boom cylinder 31a is located on the rear side of the boom 31. Therefore, it is usually difficult to secure space to route the PTO hose 51 on the rear side of the boom 31. Thus, the PTO hose 51 is routed through the inside of the boom 31. An opening (the first opening 31P described later (see Figure 4)) is formed on the side 31S of the boom 31, and the PTO hose 51 is taken out from the inside of the boom 31 to the outside through this opening. In order to suppress the reduction in strength of the boom 31 caused by providing the above opening on the side 31S of the boom 31, in this embodiment, a reinforcing part 60 is attached to the side 31S of the boom 31. That is, the hydraulic excavator 1 of this embodiment is equipped with a reinforcing part 60 that is attached to the boom 31 as a work tool. The details of the reinforcing part 60 and its attachment part will be described below.

[0021] Figure 2 is a magnified perspective view showing the mounting portion of the reinforcing part 60 on the boom 31. Figure 3 is a further magnified perspective view showing the above mounting portion. Figure 4 is a cross-sectional view when the boom 31 and the reinforcing part 60 are cut along a predetermined plane.

[0022] The aforementioned predetermined plane is defined as follows: In the boom 31 shown in Figure 1, one end that is rotatably attached to the upper slewing body 4 is defined as the base end 31b, the other end of the boom 31 to which the arm 32 is rotatably attached is defined as the tip end 31c, and the portion that bends between the base end 31b and the tip end 31c is defined as the bent portion 31d. The direction from the bent portion 31d toward the tip end 31c is defined as T1, and the direction from the tip end 31c toward the bent portion 31d is defined as T2. The aforementioned predetermined plane refers to the plane that includes the T1 direction, the T2 direction, and the left-right direction of the hydraulic excavator 1. For convenience, the T1 direction and the T2 direction will be collectively referred to as the first direction below.

[0023] As shown in Figure 4, a first opening 31P is formed on the left side surface 31S of the boom 31. The first opening 31P may also be formed on the right side surface 31S of the boom 31. In other words, the hydraulic excavator 1 of this embodiment has a boom 31 having a first opening 31P on one side (either the left or right side surface 31S). The first opening 31P is formed, for example, as an elongated hole extending in a first direction, but the shape of the first opening 31P is not particularly limited. For example, the first opening 31P may be a perfect circle when viewed from the side of the boom 31 (viewed from a direction perpendicular to the side surface 31S), or it may be a polygonal shape. It is desirable that the first opening 31P has as small an opening area as possible, since increasing the opening area of ​​the first opening 31P leads to a decrease in the strength of the boom 31.

[0024] The reinforcing portion 60 described above includes a guide portion 61 and a mounting seat 62. The guide portion 61 guides the PTO hose 51, which is the routing member 50, to a predetermined position (for example, to the left side of the boom 31). The mounting seat 62 is attached to the boom 31 (particularly the side 31S) as a work tool, for example by welding. That is, the mounting seat 62 is attached to the boom 31 via a welded portion 60W. This firmly attaches the mounting seat 62 to the boom 31. The guide portion 61 is attached to the mounting seat 62 by fasteners 71. The fasteners 71 are, for example, made up of bolts. The guide portion 61 is attached to the mounting seat 62 by fasteners 71 in two places, but there may be three or more places.

[0025] The guide portion 61 includes a flat plate 61a and a support plate 61b. The flat plate 61a is a thin plate extending in a first direction. The flat plate 61a has an outer opening 61P through which the PTO hose 51 is inserted. In other words, the guide portion 61 has an outer opening 61P.

[0026] The outer opening 61P is formed, for example, as an elongated hole extending in the first direction, but the shape of the outer opening 61P is not particularly limited. For example, the outer opening 61P, like the first opening 31P, may be a perfect circle in side view, or it may be a polygon. In the example in Figure 4, the outer opening 61P is formed in a smaller shape than the first opening 31P, but it may be formed in the same shape and size as the first opening 31P.

[0027] The flat plate 61a has a through hole 61m through which a bolt, which serves as a fastener 71, is inserted. The inner surface of the through hole 61m has a screw groove that engages with the threads on the outer surface of the bolt.

[0028] The support plate 61b is a thin plate with one end connected to the tip (end in the T1 direction) of the flat plate 61a and the other end located on the opposite side 31S of the boom 31. A hose opening 61b1 is formed in the support plate 61b, through which the PTO hose 51 passes. In this way, the PTO hose 51 is supported by the support plate 61b (see Figure 3).

[0029] The guide section 61, which has a flat plate 61a and a support plate 61b, may be formed by bending a single thin plate, or by joining two thin plates (flat plate 61a and support plate 61b) by welding or the like. Such a guide section 61 is made of, for example, general structural rolled steel. The boom 31 and other components of the work machine 3 are also made of general structural rolled steel.

[0030] The mounting base 62 is formed from, for example, high-tensile steel plate. High-tensile steel plate has higher tensile strength than general structural rolled steel. The mounting base 62 is attached to the side surface 31S of the boom 31 by welding. That is, the mounting base 62 is attached to the boom 31 via the welded joint 60W. This reinforces the boom 31.

[0031] The mounting seat 62 has a hole 62m through which a bolt, which serves as a fastener 71, is inserted. The inner surface of the hole 62m has a screw groove that engages with the threads on the outer surface of the bolt. Therefore, the guide portion 61 can be fixed to or detached from the mounting seat 62 by inserting the bolt, which is the fastener 71, into the through hole 61m of the guide portion 61 (flat plate 61a) and the hole 62m of the mounting seat 62 and tightening or loosening the bolt. Thus, when the fastener 71 is used, the guide portion 61 can be easily attached to and detached from the mounting seat 62.

[0032] The mounting base 62 has an inner opening 62P. The inner opening 62P is formed in the same shape as, for example, the outer opening 61P of the guide portion 61. Therefore, the inner opening 62P is formed in a smaller shape than the first opening 31P of the boom 31. The inner opening 62P may be formed in the same shape and size as the first opening 31P. Alternatively, the inner opening 62P may be formed in a different shape from the outer opening 61P.

[0033] The inner opening 62P is positioned to overlap with the outer opening 61P. In Figure 4, the inner opening 62P and the outer opening 61P are shown to completely overlap, but it is sufficient for at least a portion of the inner opening 62P to overlap with the outer opening 61P. Therefore, the inner opening 62P and the outer opening 61P may be positioned offset from each other so that they partially overlap (see Figure 5).

[0034] The outer opening 61P of the guide portion 61 and the inner opening 62P of the mounting seat 62 constitute the second opening 60P of the reinforcing portion 60. That is, the reinforcing portion 60 has a second opening 60P which is composed of the outer opening 61P and the inner opening 62P.

[0035] The reinforcing section 60 is attached to the boom 31 (side surface 31S) at a position where the first opening 31P and the second opening 60P overlap. The PTO hose 51 is taken out from inside the boom 31 to the outside of the boom 31 through the first opening 31P and the second opening 60P.

[0036] In the example shown in Figure 4, the second opening 60P is formed in a smaller shape than the first opening 31P. As a result, when viewed from the side of the boom 31, that is, when viewed from a direction perpendicular to the side surface 31S of the boom 31 (for example, from the left), the second opening 60P is located inward of the first opening 31P. Note that when viewed from the side of the boom 31, it is sufficient that at least a portion of the second opening 60P overlaps with the first opening 31P, and a portion of the second opening 60P may extend beyond the first opening 31P.

[0037] A buffer ring 63 is positioned inside the second opening 60P (particularly the outer opening 61P). In other words, the reinforcing part 60 is equipped with a buffer ring 63. The buffer ring 63 is formed, for example, by bending a metal rod-shaped member or pipe and bringing both ends facing each other. The ends may be connected. The buffer ring 63 is attached to the inside of the outer opening 61P, for example, by welding.

[0038] The buffer ring 63 is provided to prevent the PTO hose 51 from being damaged by contact with the corners of the second opening 60P (particularly the outer opening 61P) of the reinforcing section 60. Therefore, as shown in Figures 3 and 4, the PTO hose 51 is routed inside the second opening 60P and through the space enclosed by the buffer ring 63.

[0039] As in this embodiment, by attaching the reinforcing part 60 to the boom 31 at a position where the first opening 31P and the second opening 60P overlap, the boom 31 is reinforced by the reinforcing part 60 (suppressing a decrease in the strength of the boom 31), while the PTO hose 51, which serves as a routing member 50 passing through the inside of the boom 31, can be brought out to the outside of the boom 31 through the first opening 31P and the second opening 60P.

[0040] Furthermore, by using the guide portion 61 and the mounting seat 62 as the reinforcing portion 60, it becomes possible to form the mounting seat 62 from a material with higher tensile strength than the guide portion 61 and attach the guide portion 61 to the boom 31. Therefore, from the viewpoint of enhancing the reinforcing effect of the boom 31, it is desirable that the guide portion 61 be attached to the boom 31 via the mounting seat 62.

[0041] In a configuration using a guide portion 61 and a mounting seat 62 as the reinforcing portion 60, from the viewpoint of guiding the routing member 50 (PTO hose 51) to a predetermined position through the second opening 60P, it is desirable that the guide portion 61 and the mounting seat 62 each have an outer opening 61P and an inner opening 62P, and that the reinforcing portion 60 includes both an outer opening 61P and an inner opening 62P as the second opening 60P.

[0042] When the guide portion 61 is attached to the boom 31 via the mounting seat 62 such that the first opening 31P and the second opening 60P overlap, it is desirable that the PTO hose 51 passing through the inside of the boom 31 be routed to the outside of the boom 31 through the second opening 60P without interfering with the first opening 31P. This is desirable in order to avoid damage to the PTO hose 51 due to such interference. To achieve this, as shown in Figure 4, it is desirable that the inner opening 62P of the second opening 60P is smaller than the first opening 31P. In other words, when viewed from the side of the boom 31, it is desirable that the inner opening 62P be located inside the first opening 31P.

[0043] Furthermore, from the viewpoint of facilitating the attachment and detachment of the guide portion 61 to the mounting seat 62, it is desirable that the guide portion 61 be attached to the mounting seat 62 by fasteners 71. However, from the viewpoint of firmly attaching the guide portion 61 to the mounting seat 62, the guide portion 61 may be attached to the mounting seat 62 by welding.

[0044] Figure 5 is a cross-sectional view of the boom 31 and reinforcing section 60 when cut along a predetermined plane, showing the case where the outer opening 61P and the inner opening 62P are offset from each other. When the PTO hose 51 is routed diagonally with respect to the side surface 31S of the boom 31, it is desirable to position the outer opening 61P and the inner opening 62P along the diagonal routing path of the PTO hose 51 in order to reduce the load (bending stress) when bending the PTO hose 51 and to facilitate the routing of the PTO hose 51. From this viewpoint, as shown in Figure 5, it is desirable that the guide section 61 be attached to the mounting seat 62 at a position where the outer opening 61P and the inner opening 62P are offset from each other. In particular, it is desirable that the guide section 61 be attached to the mounting seat 62 such that the outer opening 61P is offset from the inner opening 62P in the direction that guides the PTO hose 51 after it has passed through the second opening 60P (direction T1 in Figure 5).

[0045] As described above, the configuration of this embodiment, which reinforces the boom 31 with the reinforcing part 60 while enabling the PTO hose 51 to be taken out from the inside to the outside of the boom 31, is particularly effective in configurations where the PTO hose 51 must be routed inside the boom 31, that is, in configurations where the hydraulic excavator 1 has a boom cylinder 31a as a hydraulic drive unit that drives the boom 31, and the boom cylinder 31a is located on the rear side of the boom 31. Furthermore, if the gap between the rear side of the boom 31 and the boom cylinder 31a is large, there is a concern that the excavation capacity will decrease when excavating by driving the boom 31. In this embodiment, since the PTO hose 51 is routed through the inside of the boom 31 and taken out to the outside of the boom 31 through the first opening 31P and the second opening 60P, the above gap can be reduced, which is advantageous in that it is possible to avoid a decrease in excavation capacity.

[0046] [3. Other components of the reinforcement section] Figure 6 is a cross-sectional view of the boom 31 and the reinforcing section 60 when cut along a predetermined plane, and is a cross-sectional view showing other configurations of the reinforcing section 60. The reinforcing section 60 may be constructed without using the mounting seat 62 (see Figure 4, etc.) described above. For example, the reinforcing section 60 may have the guide section 61 that guides the PTO hose 51 as the routing member 50, and the outer opening 61P of the guide section 61 may independently constitute the second opening 60P of the reinforcing section 60. In other words, the guide section 61 may have a configuration that includes the second opening 60P. The fact that the buffer ring 63 is arranged inside the second opening 60P (outer opening 61P) is the same as in the configuration shown in Figure 4, etc.

[0047] In the configuration shown in Figure 6, the guide portion 61 (particularly the flat plate 61a) is attached to the side surface 31S of the boom 31, for example, by welding. In other words, the guide portion 61 is attached to the boom 31 via the welded portion 60W. This firmly attaches the guide portion 61 to the boom 31, reinforcing the boom 31.

[0048] Figure 7 is a cross-sectional view showing another mounting structure for the reinforcing portion 60. The guide portion 61 may be attached to the boom 31 by fasteners 71, for example, bolts. In this case, the guide portion 61 (particularly the flat plate 61a) and the boom 31 have through holes 61m and insertion openings 31m, respectively, through which the bolts serving as fasteners 71 are inserted. Screw grooves are formed on the inner surfaces of the through holes 61m and insertion openings 31m to engage with the threads on the outer surface of the bolts. In this configuration, the reinforcing portion 60 (guide portion 61) can be fixed to or detached from the boom 31 by tightening or loosening the bolts, which are the fasteners 71. Therefore, it is easy to attach and detach the reinforcing portion 60 (guide portion 61) from the boom 31. In addition, the boom 31 is reinforced by fixing the guide portion 61 to the boom 31.

[0049] Even with the configurations shown in Figures 6 and 7, the PTO hose 51 is taken out from inside the boom 31 through the first opening 31P and the second opening 60P (outer opening 61P) to the outside of the boom 31. Therefore, even if the reinforcing part 60 has a guide part 61 (without a mounting seat 62), from the viewpoint of reinforcing the boom 31 and routing the PTO hose 51 as described above, it is sufficient for the guide part 61 to have the second opening 60P (which serves as the outer opening 61P) of the reinforcing part 60.

[0050] Furthermore, in order to reinforce the boom 31 with the guide portion 61 and to take out the PTO hose 51 from the inside to the outside of the boom 31 while avoiding interference between the PTO hose 51 and the first opening 31P, it is desirable to attach the reinforcing portion 60 (guide portion 61) to the boom 31 such that, when viewed from the side of the boom 31, the outer opening 61P as the second opening 60P is located inside the first opening 31P. From the viewpoint of realizing such an attachment, it is desirable that the second opening 60P (as the outer opening 61P) is smaller than the first opening 31P.

[0051] Figure 8 is a cross-sectional view showing another configuration of the guide portion 61 of the reinforcing portion 60. The outer opening 61P (second opening 60P) of the guide portion 61 constituting the reinforcing portion 60 may have the same shape and size as the first opening 31P of the boom 31. The guide portion 61 may be attached to the side surface 31S of the boom 31 such that the outer opening 61P (second opening 60P) and the first opening 31P completely overlap when viewed from the side of the boom 31.

[0052] [4. Further configurations of the reinforcement section] Figure 9 is a cross-sectional view of the boom 31 and the reinforcing section 60 when cut along a predetermined plane, and shows yet another configuration of the reinforcing section 60. The reinforcing section 60 in Figure 9 is the same configuration as shown in Figure 4, except that it has a joint 64 instead of a buffer ring 63. The differences from Figure 4 will be described below.

[0053] The joint 64 is constructed by connecting a joint body 64a and a bending member 64b. The inside of the joint body 64a is hollow, and a PTO hose 51 (first PTO hose 51a) as a routing member 50 is attached to one end (the end opposite to the side connected to the bending member 64b). The first PTO hose 51a is routed through the inside of the boom 31.

[0054] The bending member 64b is also hollow inside and is formed, for example, in an L-shape. A PTO hose 51 (second PTO hose 51b) as a routing member 50 is attached to one end of the bending member 64b (the end opposite to the side connected to the joint body 64a). The second PTO hose 51b is routed outside the boom 31. In this way, the reinforcing part 60 has a joint 64 to which PTO hoses 51 (first PTO hose 51a, second PTO hose 51b) are attached at both ends.

[0055] The joint body 64a is positioned across the first opening 31P of the boom 31 and the second opening 60P of the reinforcing section 60. The joint body 64a is then attached to the second opening 60P (outer opening 61P, inner opening 62P). For example, the joint body 64a is attached to the inner opening 62P of the mounting seat 62 by welding. Alternatively, the joint body 64a may be attached to the outer opening 61P of the guide section 61 by welding. Furthermore, since the first opening 31P is larger in shape than the second opening 60P, the joint body 64a is not in contact with the first opening 31P. However, if the first opening 31P and the second opening 60P are identical in shape and completely overlap in position, the joint body 64a may be attached to the first opening 31P by welding. The bending member 64b is located outside the outer opening 61P of the guide section 61 and is connected to the joint body 64a.

[0056] By attaching PTO hoses 51 (first PTO hose 51a and second PTO hose 51b) to both ends of the fitting 64, the hydraulic fluid flowing inside the first PTO hose 51a passes sequentially through the fitting body 64a and the bending member 64b, and is supplied to the attachment via the second PTO hose 51b.

[0057] In this way, by using the joint 64, a configuration equivalent to one in which a single PTO hose 51 is taken out from the inside of the boom 31 to the outside through the first opening 31P and the second opening 60P can be realized. In this respect, it is desirable that the joint 64 be positioned across the first opening 31P (at least).

[0058] Furthermore, from the standpoint of stably attaching the joint 64, it is desirable that the joint 64 (especially the joint body 64a) be positioned to cross the second opening 60P and be attached to the second opening 60P (by welding).

[0059] Figure 10 is a cross-sectional view showing another configuration of the joint 64. The joint 64 may consist only of a joint body 64a positioned across the first opening 31P and the second opening 60P. In this case, the first PTO hose 51a is attached to one end of the joint body 64a, and the second PTO hose 51b is attached to the other end. The joint body 64a is attached to the inner opening 62P of the mounting seat 62 by welding, which is the same as in the configuration of Figure 9.

[0060] In the configuration shown in Figure 10, the hydraulic fluid flowing through the first PTO hose 51a passes through the joint body 64a and is supplied to the attachment via the second PTO hose 51b. Therefore, even with the configuration shown in Figure 10, a configuration equivalent to one in which a single PTO hose 51 is taken out from inside the boom 31 to the outside through the first opening 31P and the second opening 60P is achieved.

[0061] Figure 11 is a cross-sectional view showing yet another configuration of the reinforcing section 60. The reinforcing section 60 may have a mounting seat 62 (without the guide section 61). The joint 64 (particularly the joint body 64a) shown in Figure 9 may be positioned across the inner opening 62P of the mounting seat 62 and may also be attached to the inner opening 62P (by welding). In the configuration of Figure 11, the inner opening 62P of the mounting seat 62 constitutes the second opening 60P of the reinforcing section 60 on its own. Even with the configuration of Figure 11, a configuration equivalent to that which reinforces the boom 31 with the mounting seat 62 while allowing one PTO hose 51 to be taken out from the inside to the outside of the boom 31 through the first opening 31P and the second opening 60P is realized.

[0062] Figure 12 is a cross-sectional view showing yet another configuration of the reinforcing section 60, and shows an example in which the joint 64 of Figure 10 is applied to the reinforcing section 60 of Figure 11. Even with this configuration, a configuration equivalent to the one in which the boom 31 is reinforced by the mounting seat 62 while a single PTO hose 51 is brought out from the inside to the outside of the boom 31 through the first opening 31P and the second opening 60P is achieved.

[0063] [3. Supplement] In this embodiment, a PTO hose 51 was used as an example of the routing member 50, but the routing member 50 is not limited to a PTO hose 51. For example, the routing member 50 may be a harness. The harness is arranged, for example, to supply power to a work light attached to the work machine 3, or to transmit signals from various sensors (for example, an angle sensor) attached to the work machine 3. Even if the routing member 50 is a harness, by applying the configuration described in this embodiment, it is possible to reinforce the boom 31 while bringing the harness out from the inside to the outside of the boom 31, or an equivalent configuration.

[0064] The hydraulic excavator 1 may also be configured to use an electric motor instead of the engine 40 as its power source.

[0065] [4. Addendum] The hydraulic excavator 1 described in this embodiment can also be described as the work machine shown in the following appendix.

[0066] The work machines mentioned in Appendix (1) are: A work tool having a first opening on one side, The work tool is attached to a reinforcing part having a second opening, The reinforcing portion is attached to the work tool at a position where the first opening and the second opening overlap.

[0067] The work machines in Appendix (2) are the work machines described in Appendix (1), The reinforcing portion has a guide portion for guiding the routing member, The guide portion has the second opening.

[0068] The work machines in Appendix (3) are the work machines described in Appendix (1) or (2), The second opening is smaller than the first opening.

[0069] The work machines in Appendix (4) are the work machines described in Appendix (1), The aforementioned reinforcing portion is A guide section that guides the routing member, It has a mounting base that is attached to the aforementioned work tool, The guide portion is attached to the work tool via the mounting base.

[0070] The work machines in Appendix (5) are the work machines described in Appendix (4), The guide portion has an outer opening, The mounting base has an inner opening that is positioned to overlap with the outer opening. The reinforcing portion includes the outer opening and the inner opening as the second opening.

[0071] The work machines in Appendix (6) are the work machines described in Appendix (5), The inner opening is smaller than the first opening.

[0072] The work machines in Appendix (7) are the work machines described in Appendix (5) or (6), The guide portion is attached to the mounting base at a position where the outer opening and the inner opening are misaligned.

[0073] The work machine in Appendix (8) is the work machine described in any of Appendix (4) to (7), The guide portion is attached to the mounting seat by fasteners.

[0074] The work machines specified in Appendix (9) are the work machines described in Appendix (1), The reinforcing portion has joints to which routing members are attached at both ends, The joint is positioned across the first opening.

[0075] The work machine in Appendix (10) is the work machine described in Appendix (9), The reinforcing portion has a mounting base to which it is attached to the work tool, The mounting base has the second opening, The joint is positioned to further cross the second opening and is attached to the second opening.

[0076] The work machine in Appendix (11) is the work machine described in any of Appendix (1) to (10), It has a hydraulic drive unit that drives the aforementioned work tool, The hydraulic drive unit is positioned on the rear side of the work tool.

[0077] 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]

[0078] This invention can be used, for example, in work machinery such as construction machinery. [Explanation of Symbols]

[0079] 1. Hydraulic excavator (working machine) 31. Boom (work tool) 31P 1st opening 31S side (one side) 31a Boom cylinder (hydraulic drive unit) 50 Measures member 51 PTO hose 51a First PTO hose 51b Second PTO hose 60 Reinforcement section 60P 2nd opening 61 Information Department 61P outer opening 62 Mounting base 62P inner opening 64 Fittings 71 Fasteners

Claims

1. A work tool having a first opening on one side, The work tool is attached to a reinforcing part having a second opening, The reinforcing portion is attached to the work tool at a position where the first opening and the second opening overlap. The aforementioned reinforcing portion is A guide section that guides the routing member, It has a mounting base that is attached to the aforementioned work tool, The guide portion is attached to the work tool via the mounting base. The guide portion supports the routing member at a position offset in a first direction along the surface with respect to the second opening, in a working machine.

2. The guide portion is, A flat plate extending in the first direction, It has a support plate connected to the aforementioned flat plate, One end of the support plate is connected to the end of the flat plate in the first direction, The other end of the support plate is located on the opposite side from the one side of the work tool. The work machine according to claim 1, wherein the support plate supports the routing member.

3. The working machine according to claim 1, wherein the second opening is smaller than the first opening.

4. The guide portion has an outer opening, The mounting base has an inner opening that is positioned to overlap with the outer opening. The work machine according to claim 1, wherein the reinforcing portion includes the outer opening and the inner opening as the second opening.

5. The work machine according to claim 4, wherein the inner opening is smaller than the first opening.

6. The work machine according to claim 4, wherein the guide portion is attached to the mounting seat at a position where the outer opening and the inner opening are offset from each other.

7. The work machine according to claim 1, wherein the guide portion is attached to the mounting seat by fasteners.

8. The reinforcing portion has joints to which routing members are attached at both ends, The working machine according to claim 1, wherein the joint is arranged across the first opening.

9. The working machine according to claim 8, wherein the joint is further positioned across the second opening and attached to the second opening.

10. The work machine according to claim 1, wherein the routing member includes a hydraulic hose or harness for supplying hydraulic fluid to the attachment.

11. It has a hydraulic drive unit that drives the aforementioned work tool, The hydraulic drive unit is located on the rear side of the work tool, as described in any one of claims 1 to 10.

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