Work machine

Abstract

To provide a work machine capable of improving accessibility and maintainability of a manual control valve provided in piping extending from an upper rotating body to a hydraulic actuator attached to a work attachment.SOLUTION: A work machine comprises: a self-propelled lower running body; an upper rotating body 3 mounted on the lower running body so as to be freely rotatable; a work attachment AT including a boom 4 attached to the upper rotating body 3 so as to be able to be raised and lowered; a hydraulic actuator attached to the work attachment AT; and a manual control valve 19 provided in piping 20 extending from the upper rotating body 3 to the hydraulic actuator. The manual control valve 19 is attached to the boom 4.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] Conventionally, a construction machine equipped with a hydraulic actuator has been known (see, for example, Patent Document 1). Patent Document 1 describes that when the number of hydraulic hoses connecting between the vehicle body side piping and the boom side piping of a construction machine increases, each hydraulic hose is not only arranged in a row in the width direction of the vehicle body, but also divided into two stages in the vertical direction and arranged in a row in the width direction of the vehicle body respectively.

[0003] That is, the construction machine described in Patent Document 1 is in a state of being divided into two stages of hose groups, namely, an upper stage hose group arranged in a row in the width direction of the vehicle body and a lower stage hose group located below the upper stage hose group and arranged in a row in the width direction of the vehicle body, and is arranged between the upper swing body and the base end side of the boom.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a working machine equipped with a hydraulic actuator, like the construction machine described in the above-mentioned Patent Document 1, a manual control valve may be provided in the piping for sending hydraulic oil to the hydraulic actuator. However, when the number of hydraulic hoses connecting between the vehicle body side piping and the boom side piping of a construction machine increases, the accessibility and maintainability of the manual control valve may decrease.

[0006] The present disclosure provides a working machine capable of improving the accessibility and maintainability of a manual control valve provided in a pipe extending from an upper slewing body to a hydraulic actuator attached to a working attachment.

Means for Solving the Problems

[0007] One aspect of the present disclosure includes a self-propelled lower traveling body, an upper slewing body rotatably mounted on the lower traveling body, a working attachment including a boom pivotally attached to the upper slewing body, a hydraulic actuator attached to the working attachment, and a manual control valve provided in a pipe extending from the upper slewing body to the hydraulic actuator, and the manual control valve is attached to the boom, providing a working machine.

Advantages of the Invention

[0008] According to the above aspect of the present disclosure, it is possible to provide a working machine capable of improving the accessibility and maintainability of a manual control valve provided in a pipe extending from an upper slewing body to a hydraulic actuator attached to a working attachment.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

[0011] FIG. 1 is a diagram showing an embodiment of a working machine according to the present disclosure. FIG. 2 is an enlarged top view of the working machine 100 in FIG. 1. FIG. 3 is a diagram showing a configuration example of a drive system mounted on the working machine 100 in FIG. 1.

[0012] In each figure except FIG. 3, a three-dimensional orthogonal coordinate system having an X-axis parallel to the width direction (left-right direction) of the working machine 100 in the posture shown in FIG. 1, a Y-axis parallel to the front-rear direction of the working machine 100, and a Z-axis parallel to the height direction (up-down direction) of the working machine 100 is shown. Further, in FIG. 3, the mechanical power transmission line is shown by a double line, the hydraulic oil line is shown by a thick solid line, the pilot line is shown by a broken line, and the electric control line is shown by a dotted line.

[0013] The working machine 100 shown in FIG. 1 is, for example, a forestry machine that performs a conveying operation of conveying logs felled at a work site such as a mountain forest. Note that the working machine 100 is not limited to a forestry machine, and may be, for example, a construction machine such as a shovel or a crane.

[0014] The working machine 100 includes, for example, as shown in FIGS. 1 and 3, a lower traveling body 1, an upper swing body 3, a work attachment AT, a hydraulic actuator HA, and a manual control valve 19. Further, the working machine 100 includes, for example, as shown in FIGS. 1 and 2, a swing mechanism 2 including swing hydraulic motors 2A and 2B.

[0015] Further, the working machine 100 includes, for example, as shown in FIG. 3, an engine 11, a regulator 13, a main pump 14, a pilot pump 15, a hydraulic oil line 16, a control valve unit 17, an engine control unit 74, and a solenoid valve unit 45.

[0016] The work machine 100 also includes, for example, as shown in FIG. 3, a controller 30, a positioning device 18, an imaging device C1, a boom angle sensor S1, an arm angle sensor S2, a heel angle sensor S3, a grapple angle sensor S4, a swing angular velocity sensor S5, and a communication device T1.

[0017] The lower traveling body 1 is configured to be self-propelled, and includes, for example, a pair of crawlers driven by a left-side traveling hydraulic motor 1L and a right-side traveling hydraulic motor 1R. The slewing mechanism 2 includes, for example, a slewing gear, a slewing bearing, slewing hydraulic motors 2A, 2B, a reducer, and the like (not shown), and rotates the upper slewing body 3 relative to the lower traveling body 1. The upper slewing body 3 is mounted on the lower traveling body 1 via the slewing mechanism 2 so as to be rotatable.

[0018] The upper rotating body 3 is equipped with, for example, a drive system excluding a part of the hydraulic actuator HA shown in Fig. 3, a controller 30, an imaging device C1, etc. A counterweight 31, for example, is attached to the rear of the upper rotating body 3. In addition, a cabin 10 in which an operator of the work machine 100 boards is provided on the left front side of the upper rotating body 3, as shown in Fig. 1, for example.

[0019] 1, a work attachment AT is attached to the front right side of the upper rotating body 3. The work attachment AT includes at least a boom 4 attached to the upper rotating body 3 so as to be capable of ascending and descending. Specifically, the work attachment AT includes, for example, the boom 4, an arm 5, and a heel 6A and a grapple 6B as end attachments.

[0020] The hydraulic actuator HA includes, for example, a boom cylinder 7, an arm cylinder 8, a heel cylinder 9, a grapple cylinder 12, and a grapple hydraulic motor 2C that are attached to the work attachment AT. The hydraulic actuator HA also includes, for example, a left-side traveling hydraulic motor 1L and a right-side traveling hydraulic motor 1R mounted on the lower traveling body 1, and swing hydraulic motors 2A, 2B mounted on the upper swing body 3.

[0021] The boom 4 is attached to the upper swing body 3, for example, via a boom foot pin 41 (see FIG. 5) parallel to the width direction of the upper swing body 3, and pivots up and down about the boom foot pin 41 by the extension and contraction of the boom cylinder 7. More specifically, the boom 4 is disposed, for example, as shown in FIG. 2, between the left and right brackets 3BL, 3BR provided on the upper swing body 3, and is pivotally attached to these left and right brackets 3BL, 3BR via the boom foot pin 41.

[0022] The arm 5 is attached to the tip of the boom 4, for example, via an arm pin parallel to the boom foot pin 41, and opens and closes (extends and bends) by pivoting about the arm pin by the extension and contraction of the arm cylinder 8.

[0023] The heel 6A is attached to the tip of the arm 5, for example, via a heel pin parallel to the arm pin, and pivots about the heel pin by the extension and contraction of the heel cylinder 9. The grapple 6B is rotatably attached to the tip of the heel 6A, for example, via a grapple pin parallel to the heel pin.

[0024] The grapple 6B includes, for example, a grapple hydraulic motor 2C and a grapple cylinder 12 shown in FIG. 3. The grapple hydraulic motor 2C is swingably supported, for example, via a swing pin perpendicular to the grapple pin, and rotates the tongs of the grapple 6B about an axis perpendicular to the grapple pin. The grapple cylinder 12 opens and closes the tongs of the grapple 6B, for example, by extending and contracting. Specifically, for example, when the piston rod of the grapple cylinder 12 extends, the tongs of the grapple 6B close, and when the piston rod of the grapple cylinder 12 contracts, the tongs of the grapple 6B open.

[0025] By expanding and contracting the grapple cylinder 12 to open and close the tongs of the grapple 6B, the log RW cut in the mountain forest as shown in FIG. 1 can be grasped by the tongs of the grapple 6B. Further, by rotating the tongs of the grapple 6B by the grapple hydraulic motor 2C, the orientation of the log RW grasped by the tongs can be adjusted. Furthermore, by expanding and contracting the heel cylinder 9 to rotate the heel 6A, the log RW grasped by the tongs of the grapple 6B can be supported at an arbitrary inclination by the base end portion on the side opposite to the tip end portion of the heel 6A.

[0026] When the work machine 100 is a shovel, the work attachment AT may include a bucket as an end attachment instead of the heel 6A and the grapple 6B. In this case, the work machine 100 may include a bucket cylinder that opens and closes (dumps and crowds) the bucket instead of the heel cylinder 9, the grapple cylinder 12, and the grapple hydraulic motor 2C.

[0027] As shown in FIG. 3, the manual control valve 19 is provided, for example, in a pipe 20 that connects the control valve unit 17 and the bottom side of the grapple cylinder 12 as a hydraulic actuator HA. This pipe 20 extends, for example, from the upper swing body 3 equipped with the control valve unit 17 to the grapple cylinder 12 attached to the work attachment AT.

[0028] The manual control valve 19 is, for example, a pressure reducing valve capable of manually adjusting the pressure of the hydraulic oil supplied to the bottom chamber of the grapple cylinder 12. Note that the manual control valve 19 is not limited to a pressure reducing valve, and may be, for example, a direction control valve capable of manually switching between blocking and flowing the hydraulic oil. The manual control valve 19 is manually adjusted or operated by a dealer or a user, for example, before starting the use of the work machine 100.

[0029] The engine 11 is a power source of the working machine 100. The engine 11 is, for example, a diesel engine. The output shaft of the engine 11 is connected to the input shafts of the main pump 14 and the pilot pump 15, respectively.

[0030] The regulator 13 is configured to control the discharge amount of the main pump 14. In the present embodiment, the regulator 13 is configured to adjust the swash plate tilt angle of the main pump 14 according to, for example, the discharge pressure of the main pump 14 or a control signal from the controller 30. The regulator 13 transmits data regarding the swash plate tilt angle to the controller 30.

[0031] The main pump 14 supplies hydraulic oil to the control valve unit 17 via the hydraulic oil line 16. In the present embodiment, the main pump 14 is a swash plate type variable displacement hydraulic pump. The discharge amount (push-back volume) per revolution of the main pump 14 is controlled by the regulator 13.

[0032] The pilot pump 15 is configured to supply hydraulic oil to various hydraulic control devices via the pilot line 25. In the present embodiment, the pilot pump 15 is a fixed displacement hydraulic pump. However, the pilot pump 15 may be omitted. In this case, the functions previously performed by the pilot pump 15 may be realized by the main pump 14. That is, the main pump 14 may have a function of supplying hydraulic oil to the solenoid valve unit 45 etc. via a throttle or the like, in addition to the function of supplying hydraulic oil to the control valve unit 17.

[0033] The control valve unit 17 is configured to selectively supply the hydraulic oil received from the main pump 14 to one or more hydraulic actuators HA. In the present embodiment, the control valve unit 17 includes a plurality of control valves corresponding to a plurality of hydraulic actuators. And the control valve unit 17 is configured to selectively supply the hydraulic oil discharged from the main pump 14 to one or more hydraulic actuators HA.

[0034] The engine control unit 74 is connected to the engine 11 and controls the driving of the engine 11. The engine control unit 74 outputs various data indicating the state of the engine 11 to the controller 30.

[0035] The solenoid valve unit 45 includes a plurality of solenoid valves arranged in each pilot line 25 that connects the pilot pump 15 and the pilot ports of the control valves in the control valve unit 17.

[0036] As described above, the controller 30 is an arithmetic unit that executes various operations. The controller 30 is configured to control the solenoid valve unit 45 based on operation signals input from an operation device including operation levers and operation pedals in the cabin 10. The controller 30 can realize raising and lowering of the boom 4, opening and closing of the arm 5, rotation of the heel 6A, opening and closing and rotation of the tongs of the grapple 6B, turning of the upper swing body 3, and traveling of the lower traveling body 1, etc. according to the operation signals. The controller 30 is configured to be able to store various data indicating the state of the engine 11 in the memory.

[0037] The imaging device C1 is configured to image the periphery of the working machine 100. In the present embodiment, the imaging device C1 has at least one or a plurality of the rear camera attached to the rear end of the upper surface of the upper swing body 3, the front camera attached to the front end of the upper surface of the cabin 10, the left camera attached to the left end of the upper surface of the upper swing body 3, and the right camera attached to the right end of the upper surface of the upper swing body 3 arranged.

[0038] FIG. 4 is an enlarged perspective view of the periphery of the base end portion of the boom 4 showing an example of the mounting position of the manual control valve 19 in the working machine 100 of FIG. 1. As shown in FIGS. 3 and 4, the manual control valve 19 is provided, for example, in a pipe 20 extending from the upper swing body 3 to the grapple cylinder 12 as a hydraulic actuator HA that opens and closes the grapple 6B attached to the tip of the working attachment AT, and is attached to the boom 4.

[0039] The manual control valve 19 is attached to, for example, the rear surface 4b of the boom 4. The rear surface 4b of the boom 4 is, for example, a surface facing the rear (negative Y-axis direction) of the upper swing body 3 in a state where the boom 4 is erected so as to stand substantially upright, as shown in FIGS. 1 and 4. Further, the manual control valve 19 is attached, for example, above the work floor WP provided on the upper swing body 3 in a state where the boom 4 is erected.

[0040] In the example shown in FIG. 4, the work floor WP is provided, for example, on the front side (positive Y-axis direction side) of the engine hood covering the engine 11 housed in the upper swing body 3 and on the rear side (negative Y-axis direction side) of the boom 4. Further, the work floor WP is, for example, a scaffold for a worker P who performs maintenance etc. of the working machine 100, and also serves as a passage for an operator operating the working machine 100 to access the door 10d of the cab 10. Handrails HR are attached to the outer edge of the work floor WP and a part of the wall of the cab 10.

[0041] Further, in the example shown in FIG. 4, the manual control valve 19 is attached, for example, at a height accessible to the worker P working on the work floor WP in a standing position in a state where the boom 4 is erected. Here, the height accessible to the worker P in a standing position is a height based on the work floor WP, and is, for example, equal to or less than the height of a small-sized operator (1550 mm) defined in Japanese Industrial Standard (JIS A8315:2010). Further, the height accessible to the worker P in a standing position is, for example, equal to or more than the height from the sole of the shoe to the knee of a large-sized operator (570 mm) defined in Japanese Industrial Standard (JIS A8315:2010).

[0042] Also, in the example shown in FIG. 4, a protective fence G is provided at a position adjacent to the boom 4 of the work floor WP. The manual control valve 19 is attached, for example, at a position higher than the protective fence G with the boom 4 erected. The height of the protective fence G with respect to the work floor WP is, for example, at least 1000 mm and at most 1100 mm as specified in Japanese Industrial Standard (JIS A8302:2017) when the height from the scaffold one step below the work floor WP is 3 m or more. Further, for example, when the height from the scaffold one step below the work floor WP is less than 3 m, the height of the protective fence G with respect to the work floor WP may be the above height, or may be at least 850 mm and at most 960 mm in accordance with the standard as a handrail HR.

[0043] Note that the manual control valve 19 does not necessarily have to be attached to the rear surface 4b of the boom 4. Specifically, the manual control valve 19 may be attached, for example, to the side surface 4s of the boom 4. The side surface 4s of the boom 4 is, for example, a surface facing the width direction (X-axis direction) of the upper swing body 3 in the boom 4. From the viewpoints of the accessibility of the operator to the door 10d of the cabin 10 and prevention of interference, it is preferable to attach the manual control valve 19 to the side surface 4s on the side opposite to the side surface 4s of the boom 4 adjacent to the cabin 10.

[0044] The left travel hydraulic motor 1L and the right travel hydraulic motor 1R shown in FIG. 3 rotate the left and right crawlers of the lower travel body 1 shown in FIG. 1, respectively, to move the work machine 100 forward, backward, or turn.

[0045] Also, the swing hydraulic motors 2A and 2B are mounted on the upper swing body 3, for example, as shown in FIG. 2, and are arranged at a position adjacent to the boom 4 on the rear side of the boom 4 attached to the upper swing body 3. The swing hydraulic motors 2A and 2B constituting the swing mechanism 2 rotate a pinion that meshes with a swing gear mounted on the lower travel body 1 via a speed reducer, for example, to swing the upper swing body 3 mounted on the lower travel body 1.

[0046] In this embodiment, the construction machine 100 includes, for example, as shown in FIG. 2, a two-piece type slewing hydraulic motor 2A and 2B arranged adjacent to each other in the width direction (X-axis direction) of the upper slewing body 3. The two-piece type slewing hydraulic motor 2A and 2B can increase the slewing torque of the upper slewing body 3. Note that the construction machine 100 may be configured to include only a single slewing hydraulic motor.

[0047] FIG. 5 is an enlarged perspective view of the vicinity of the base end portion of the boom 4 in the construction machine 100 of FIG. 1. FIG. 6 is a side view of the pipes 22 and 23 passing through the side of the two-piece type slewing hydraulic motor 2A and 2B of FIG. 2. In FIGS. 5 and 6, in order to facilitate visual recognition of each of the pipes 20, 21, 22, 23, 26, 27, 28, and 29, illustration of a part of the configuration of the construction machine 100 is omitted. Further, in FIG. 5, a state in which the left and right brackets 3BL and 3BR of the boom 4 shown in FIG. 2 are cut off is shown.

[0048] The pipes 20, 21, 22, 23, 26, 27, 28, and 29 shown in FIGS. 4 to 6 extend from the upper slewing body 3 to the hydraulic actuator HA attached to the work attachment AT. Here, the hydraulic actuator HA attached to the work attachment AT includes, for example, as shown in FIGS. 1 and 3, an arm cylinder 8, a heel cylinder 9, a grapple cylinder 12, and a grapple hydraulic motor 2C.

[0049] One end of the pipe 20 is connected to the control valve unit 17 via a connection portion 20c, for example, as shown in FIG. 2. The pipe 20 extends from the control valve unit 17 mounted on the upper slewing body 3 to the grapple cylinder 12 attached to the grapple 6B constituting the work attachment AT and is connected to the bottom chamber of the grapple cylinder 12.

[0050] Similarly, one end of the pipe 21 is connected to the control valve unit 17 via a connection portion 21c, for example, as shown in FIG. 2. The pipe 21 extends from the control valve unit 17 to the grapple cylinder 12 and is connected to the rod chamber of the grapple cylinder 12, for example.

[0051] Also, below the pipes 20 and 21, for example, as shown in FIGS. 2 and 3, a pipe 24L extending from the control valve unit 17 to the left travel hydraulic motor 1L is arranged. The pipes 20 and 21 are supported by a support member S fixed to the rear surface 4b of the boom 4, for example, as shown in FIG. 5.

[0052] Although not shown in FIG. 3, as shown in FIGS. 4 and 5, for example, a drain pipe 32 is connected to the manual control valve 19. The manual control valve 19 is a pressure reducing valve that reduces the pressure of the hydraulic oil, for example, and it is possible to manually adjust the set pressure of the hydraulic oil after pressure reduction. The drain pipe 32 is connected to the hydraulic oil tank from the manual control valve 19 attached to the boom 4 via the control valve unit 17 mounted on the upper swing body 3, for example. Note that the drain pipe 32 may be connected to the hydraulic oil tank of the upper swing body 3 without passing through the control valve unit 17.

[0053] The drain pipe 32 is a drain path that returns the hydraulic oil that has become unnecessary in the manual control valve 19, which reduces the pressure of the hydraulic oil supplied to the grapple cylinder 12 via the pipe 20 when the grapple cylinder 12 is extended to close the tongs of the grapple 6B, to the hydraulic oil tank. In this way, by reducing the pressure of the hydraulic oil supplied to the bottom chamber of the grapple cylinder 12 with the manual control valve 19, it is possible to prevent crushing of the log RW or wood when the tongs of the grapple 6B are closed.

[0054] One end of the pipe 22 is connected to the control valve unit 17 via a connection part 22c, as shown in FIGS. 2 and 6, for example. The pipe 22 extends, for example, from the control valve unit 17 mounted on the upper swing body 3 to the heel cylinder 9 attached to the arm 5 and the heel 6A that constitute the work attachment AT, and is connected to the bottom chamber of the heel cylinder 9.

[0055] Similarly, one end of the pipe 23 is connected to the control valve unit 17 via a connection part 23c, as shown in FIGS. 2 and 6, for example. The pipe 23 extends from the control valve unit 17 to the heel cylinder 9, for example, and is connected to the rod chamber of the heel cylinder 9.

[0056] Also, below the pipes 22 and 23, a pipe 24R extending from the control valve unit 17 to the right travel hydraulic motor 1R is arranged, as shown in FIGS. 2 and 3, for example. Also, the pipes 22 and 23 are supported by a support member S fixed to the back surface 4b of the boom 4, as shown in FIG. 6, for example.

[0057] The pipe 26 and the pipe 27 each extend from the control valve unit 17 mounted on the upper swing body 3 to the grapple hydraulic motor 2C attached to the grapple 6B that constitutes the work attachment AT, and are connected to the grapple hydraulic motor 2C.

[0058] The pipe 28 extends from the control valve unit 17 mounted on the upper swing body 3 to the arm cylinder 8 attached to the boom 4 and the arm 5 that constitute the work attachment AT, and is connected to the bottom chamber of the arm cylinder 8. Similarly, the pipe 29 extends from the control valve unit 17 to the arm cylinder 8 and is connected to the rod chamber of the arm cylinder 8.

[0059] These pipes 20, 21, 22, 23, 26, 27, 28, 29 include flexible pipes disposed between the upper swing body 3 and the boom 4. The flexible pipes are, for example, hoses having flexibility and allow the pitching movement of the boom 4 with respect to the upper swing body 3. Note that portions of the pipes 20, 21, 22, 23, 26, 27, 28, 29 excluding the flexible pipes can be constituted by, for example, metal pipes having no flexibility.

[0060] Among the flexible pipes included in each of the pipes 20, 21, 22, 23, 26, 27, 28, 29, the flexible pipes of each of the pipes 20, 21, 22, 23, 26, 27 are back-side flexible pipes extending to the back 4b side of the boom 4 as shown in FIG. 2. On the other hand, the flexible pipes included in each of the pipes 28, 29 are front-side flexible pipes extending to the front 4f side opposite to the back 4b side of the boom 4 as shown in FIG. 5.

[0061] Also, as shown in FIG. 2, between the swing hydraulic motors 2A, 2B and the boom 4 below the pipes 20, 21, 22, 23, 26, 27, 28, 29, for example, a grease pipe 33 for supplying grease to a sliding portion of a work attachment AT such as a boom foot pin 41 is disposed.

[0062] As shown in FIGS. 2 and 6, the back-side flexible pipes of the pipes 22 and 23 are disposed in the vertical direction (Z-axis direction) between both side surfaces 4s, 4s in the width direction (X-axis direction) of the boom 4 and on the right side (positive X-axis direction side) of the dual swing hydraulic motors 2A, 2B. Similarly, the back-side flexible pipes of the pipes 20 and 21 are disposed in the vertical direction between both side surfaces 4s, 4s in the width direction of the boom 4 and on the left side (negative X-axis direction side) of the dual swing hydraulic motors 2A, 2B.

[0063] Specifically, the pipes 20 and 21, which are the left rear flexible pipes, are arranged between the left swing hydraulic motor 2A that constitutes the swing device and the left side surface 4s or the left bracket 3BL of the boom 4. Similarly, the pipes 22 and 23, which are the right rear flexible pipes, are arranged between the right swing hydraulic motor 2B that constitutes the swing device and the right side surface 4s or the bracket 3BR of the boom 4. In other words, on both the left and right sides, the pipes 20, 21, 22, and 23, which are the rear flexible pipes, are arranged between the swing device and the side surface 4s of the boom 4 or the boom mounting bracket.

[0064] That is, the pipes 20, 21, 22, and 23 include a plurality of rear flexible pipes that are arranged vertically on both sides between the two side surfaces 4s, 4s in the width direction of the boom 4 and on both sides of the double swing hydraulic motors 2A and 2B and extend to the rear 4b side of the boom 4. Here, as shown in FIG. 6, the outer diameter of the rear flexible pipe of the pipe 22 arranged on the lower side is, for example, larger than the outer diameter of the rear flexible pipe of the pipe 23 arranged on the upper side. Similarly, as shown in FIG. 2, the outer diameter of the rear flexible pipe of the pipe 20 arranged on the lower side is, for example, larger than the outer diameter of the rear flexible pipe of the pipe 21 arranged on the upper side.

[0065] Thereby, the pressure loss of the rear flexible pipes of the pipes 20 and 22 with a large outer diameter can be made lower than the pressure loss of the rear flexible pipes of the pipes 21 and 23 with a small outer diameter. Also, when the boom 4 is erected, as shown in FIG. 6, the curvature radius of the rear flexible pipes of the pipes 20 and 22 with a large outer diameter can be made larger than the curvature radius of the rear flexible pipes of the pipes 21 and 23 with a small outer diameter, and damage and deterioration of the rear flexible pipes with a large outer diameter can be prevented.

[0066] Also, as shown in FIG. 5, the pipes 28 and 29 extending from the control valve unit 17 mounted on the upper revolving body 3 to the arm cylinder 8 include a plurality of front flexible pipes extending to the front 4f side opposite to the rear 4b of the boom 4 between the both side surfaces 4s, 4s in the width direction (X-axis direction) of the boom 4. More specifically, the pipes 28 and 29 are inserted through an opening 3BO provided in a plate 3BP that connects the left and right brackets 3BL and 3BR. Further, on both sides of the plate 3BP that connects the left and right brackets 3BL and 3BR, for example, mounting portions 3BM for attaching the foot pins of the boom cylinder 7 are provided.

[0067] Hereinafter, the operation of the working machine 100 of the present embodiment will be described while making a comparison with the prior art.

[0068] In a working machine equipped with a hydraulic actuator, like the construction machine described in the aforementioned Patent Document 1, a manual control valve may be provided in the pipe that supplies hydraulic oil to the hydraulic actuator. However, when the number of hydraulic hoses connecting the vehicle body side pipes and the boom side pipes of the construction machine increases, the accessibility and maintainability of the manual control valve may decrease.

[0069] Specifically, for example, in a conventional construction machine, when the number of hydraulic actuators attached to the working device increases, the number of hydraulic hoses connecting the vehicle body side pipes and the boom side pipes of the construction machine increases. In this case, it is necessary to provide pipe fixing brackets and pass a plurality of hydraulic hoses over the slewing hydraulic motor to avoid interference between the plurality of hydraulic hoses and the slewing hydraulic motor.

[0070] In this case, there is a risk that the accessibility and maintainability of an operator who operates a manual control valve provided in a pipe for sending hydraulic oil to a hydraulic actuator will be impaired because a pipe fixing bracket protrudes above the work floor on the upper swing body. Further, when the manual control valve is attached to the upper swing body, it becomes difficult to secure an installation space for the manual control valve on the upper swing body. Therefore, there is a risk that the accessibility and maintainability of the manual control valve operated by the operator on the upper swing body will deteriorate.

[0071] On the other hand, the working machine 100 of the present embodiment includes a self-propelled lower traveling body 1, an upper swing body 3 rotatably mounted on the lower traveling body 1, and a working attachment AT including a boom 4 pivotally attached to the upper swing body 3. Further, the working machine 100 includes a hydraulic actuator HA attached to the working attachment AT and a manual control valve 19 provided in a pipe 20 extending from the upper swing body 3 to the hydraulic actuator HA. The manual control valve 19 is attached to the boom 4.

[0072] With such a configuration, in the working machine 100 of the present embodiment, the operator can easily operate the manual control valve 19 attached to the boom 4 from above the upper swing body 3 with the boom 4 erected. Therefore, even if the number of hydraulic actuators HA attached to the working attachment AT increases and the pipes 20, 21, 22, 23, 26, 27, 28, 29 extending from the upper swing body 3 to the hydraulic actuator HA increase, the accessibility and maintainability of the manual control valve 19 provided in the pipe 20 among them can be improved.

[0073] Further, in the working machine 100 of the present embodiment, the manual control valve 19 is attached to the side surface 4s or the back surface 4b of the boom 4.

[0074] With such a configuration, in the construction machine 100 of the present embodiment, an operator can easily operate the manual control valve 19 attached to the side surface 4s or the back surface 4b of the boom 4 from above the upper swing body 3 adjacent to the side surface 4s or the back surface 4b of the erected boom 4. Therefore, the accessibility and maintainability with respect to the manual control valve 19 can be further improved.

[0075] Further, in the construction machine 100 of the present embodiment, the manual control valve 19 is attached above the work floor WP provided on the upper swing body 3 with the boom 4 erected.

[0076] With such a configuration, an operator who operates the manual control valve 19 does not need to take a posture of bending down on the work floor WP and stretching the hand downward. Therefore, the accessibility and maintainability with respect to the manual control valve 19 can be further improved.

[0077] Further, in the construction machine 100 of the present embodiment, the manual control valve 19 is attached at a height accessible to an operator working on the work floor WP in a standing position with the boom 4 erected.

[0078] With such a configuration, an operator who has reached a position where the manual control valve 19 can be manually adjusted through the passage formed by the work floor WP can operate, adjust, and maintain the manual control valve 19 while standing without bending on the work floor WP. Therefore, the accessibility and maintainability with respect to the manual control valve 19 can be further improved.

[0079] Further, in the construction machine 100 of the present embodiment, a protective fence G is provided at a position adjacent to the boom 4 of the work floor WP. Further, the manual control valve 19 is attached at a position higher than the protective fence G with the boom 4 erected.

[0080] With such a configuration, not only can the safety of the worker working on the work floor WP be improved, but also it is possible to prevent the protective fence G from interfering with the operation, adjustment, and maintenance of the manual control valve 19. Therefore, it is possible to improve the safety while further improving the accessibility and maintainability of the manual control valve 19.

[0081] Further, the working machine 100 of the present embodiment further includes a two-stage swing hydraulic motor 2A, 2B mounted on the upper swing body 3. Further, the manual control valve 19 is attached to the back surface 4b of the boom 4, and further, the pipes 20, 21, 22, 23 extending from the upper swing body 3 to the hydraulic actuator HA include a plurality of rear-side flexible pipes arranged vertically between both side surfaces 4s, 4s in the width direction of the boom 4 and on both sides of the two-stage swing hydraulic motor 2A, 2B and extending to the back side of the boom 4.

[0082] With such a configuration, the rear-side flexible pipes of the pipes 20, 21, 22, 23 extending from the upper swing body 3 to the hydraulic actuator HA can be arranged on both sides of the two-stage swing hydraulic motor 2A, 2B without passing over the two-stage swing hydraulic motor 2A, 2B. Thereby, even if the pipes 20, 21, 22, 23 extending from the upper swing body 3 to the hydraulic actuator HA increase, it is not necessary to provide a pipe fixing bracket for passing the rear-side flexible pipe over the two-stage swing hydraulic motor 2A, 2B as in the conventional construction machine. As a result, it is possible to secure a work floor WP with sufficient area on the upper swing body 3, and it is possible to further improve the accessibility and maintainability of the manual control valve 19.

[0083] Further, the rear-side flexible pipes of the pipes 20, 21, 22, 23 extending from the upper swing body 3 to the hydraulic actuator HA can be arranged between both side surfaces 4s, 4s of the boom 4. Thereby, when the boom 4 pitches, it is possible to prevent the rear-side flexible pipes of the pipes 20, 21, 22, 23 from interfering with the upper swing body 3, the cabin 10, the log RW, the standing tree, etc. As a result, it is possible to prevent the rear-side flexible pipes of the pipes 20, 21, 22, 23 from being damaged or deteriorated.

[0084] Further, in the working machine 100 of the present embodiment, the pipes 28 and 29 extending from the upper swing body 3 to the hydraulic actuator HA include a plurality of front flexible pipes extending to the front 4f side opposite to the rear surface 4b of the boom 4 between the both side surfaces 4s, 4s in the width direction of the boom 4.

[0085] With such a configuration, the number of the pipes 20, 21, 22, 23, 26, and 27 extending from the upper swing body 3 to the rear surface 4b side of the boom 4 can be reduced, and the space above the upper swing body 3 can be secured. As a result, not only can the layout of the pipes 20, 21, 22, 23, 26, and 27 extending from the upper swing body 3 to the rear surface 4b side of the boom 4 be facilitated, but also the area of the working floor WP on the upper swing body 3 can be secured, and the accessibility and maintainability for the manual control valve 19 can be further improved.

[0086] As described above, according to the present embodiment, it is possible to provide a working machine 100 capable of improving the accessibility and maintainability of the manual control valve 19 provided in the pipe 20 extending from the upper swing body 3 to the hydraulic actuator HA attached to the working attachment AT.

[0087] As described above in detail, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments. Various modifications or substitutions etc. can be applied to the above-described embodiments without departing from the scope of the present invention. Further, the features described separately can be combined as long as no technical contradiction occurs.

Description of Reference Numerals

[0088] 1 Lower Traveling Body 3 Upper Swing Body 2A Swing Hydraulic Motor 2B Swing Hydraulic Motor 4 Boom 4b Rear Surface 4f Front Surface 4s Side Surface 19 Manual Control Valve 20 Pipe (Rear Flexible Pipe) 21 Pipe (Flexible pipe on the back side) 22 Pipe (Flexible pipe on the back side) 23 Pipe (Flexible pipe on the back side) 26 Pipe 27 Pipe 28 Pipe (Flexible pipe on the front side) 29 Pipe (Flexible pipe on the front side) 100 Working machine AT Working attachment G Guard fence HA Hydraulic actuator P Operator WP Working floor

Claims

1. A self-propelled lower traveling body, an upper slewing body rotatably mounted on the lower traveling body, a work attachment including a boom pivotally attached to the upper slewing body, a hydraulic actuator attached to the work attachment, a manual control valve provided in a pipe extending from the upper slewing body to the hydraulic actuator, and comprising, the manual control valve is attached to the boom, a working machine.

2. The manual control valve is attached to a side surface or a rear surface of the boom, The working machine according to Claim 1.

3. The manual control valve is attached above a work floor provided on the upper slewing body with the boom erected, The working machine according to Claim 2.

4. The manual control valve is attached at a height accessible in a standing position by an operator working on the work floor with the boom erected, The working machine according to Claim 3.

5. A protective fence is provided at a position adjacent to the boom on the work floor, The working machine according to Claim 4, wherein the manual control valve is attached at a position higher than the protective fence with the boom erected.

6. Further comprising a two-stage slewing hydraulic motor mounted on the upper slewing body, the manual control valve is attached to the rear surface of the boom, the pipe includes a plurality of rear-side flexible pipes arranged vertically between both side surfaces in the width direction of the boom and on both sides of the two-stage slewing hydraulic motor and extending to the rear surface side of the boom, The working machine according to Claim 2.

7. The pipe includes a plurality of front-side flexible pipes extending to the front side opposite to the rear surface of the boom between both side surfaces in the width direction of the boom, The working machine according to Claim 6.

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