JP2003003511A - Working device and working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a failure such as damage to a cylinder by eliminating a structure protruding to the side of back surfaces of a boom and an arm. SOLUTION: The square column-shaped arm 25, which has a box structure and has a base end and an end opened, is journaled turnably at an end of the square column-shaped boom 22 which has a box structure and has a base end and the end opened. An arm cylinder 24, which makes the arm 25 turned with respect to the boom 22, is inserted into the boom 22 so as to be journaled in a turnable manner. A bucket 29 is journaled turnably at the end of the arm 25. A bucket cylinder 27, which makes the bucket 29 turned with respect to the arm 25, is inserted into the arm 25 in order to be journaled in the turnable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working device having a built-in cylinder and a working machine having the working device.

[0002]

2. Description of the Related Art As shown in FIG. 15, in a hydraulic excavator, an upper revolving structure 2 is rotatably provided on a lower traveling structure 1, and the upper revolving structure 2 together with a driver's seat 3 perform front work as a working device. A device 4 is provided.

The front working device 4 is provided on the upper swing body 2.
The boom 5 that is vertically rotated by the boom cylinder 5a
Is pivotally supported, the arm 6 is pivotally supported by the arm cylinder 6a at the tip of the boom 5, and the bucket 7 is pivotally supported by the bucket cylinder 7a at the tip of the arm 6.
Is pivotally supported.

The arm cylinder 6a is mounted on the back surface of the boom 5, and the bucket cylinder 7a is mounted on the back surface of the arm 6.

A hydraulic pipe (not shown) for supplying hydraulic oil to the arm cylinder 6a and the bucket cylinder 7a is arranged along the back surface or the side surface of the boom 5.

In short, the arm cylinder 6a, the bucket cylinder 7a, and the hydraulic pipes to these are visually provided outside the boom 5 and the arm 6.

[0007]

Since the arm cylinder 6a and the bucket cylinder 7a are structures projecting to the rear side of the boom 5 and the arm 6, during excavation work or work using an attachment that replaces the bucket 7, or When a machine is transported by a carrier, the vehicle is easily affected by the outside, and sometimes interference with an external obstacle may cause a cylinder damage problem, and the vehicle may be forced to stop functioning. To prevent this, the arm cylinder
A robust cover may be provided on 6a and bucket cylinder 7a.

Further, the hydraulic pipes for supplying the hydraulic oil to the arm cylinder 6a and the bucket cylinder 7a are also easily influenced by the outside, and similarly, sometimes a pipe breakage problem occurs, which is prevented. Therefore, a robust cover may be attached to the hydraulic piping.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent problems such as cylinder breakage by eliminating the protruding structure of the boom and arm to the rear side. .

[0010]

According to the invention described in claim 1, there is provided a box-shaped tubular boom having a base end portion and a tip end portion opened, and a pivotally rotatably supported at the tip end portion of the tubular boom. And a cylindrical arm having a box structure with an open base end and a distal end, and an arm cylinder that is inserted into the cylindrical boom and rotatably supported to rotate the cylindrical arm with respect to the cylindrical boom. A work body rotatably supported at the tip of the cylindrical arm, and a work body cylinder inserted into the cylindrical arm and rotatably supported to rotate the work body with respect to the cylindrical arm. Since the arm cylinder is inserted into the tubular boom and the work body cylinder is inserted into the tubular arm, the working device is provided with a protrusion to the rear side of the tubular boom and the tubular arm. Cylinders are It is possible to prevent problems such as cylinder damage due. In particular, the tubular boom and tubular arm are robust tubular structures, so there is no risk of deformation and the intrusion of external obstacles is reliably prevented, ensuring reliable protection of the internal arm cylinder and work cylinder. it can.

According to a second aspect of the present invention, in the working apparatus according to the first aspect, the abdominal surface side of the side plate portion of the proximal end portion of the cylindrical arm is projected at the abdominal surface side at the tip of the tubular boom. An arm connecting bracket that is pivotally coupled to the arm, and an arm of the cylindrical boom in an extended position that is provided on the rear side of the cylindrical arm at the base end of the cylindrical arm and does not protrude from the rear surface and is positioned on the extension of the cylindrical boom. A working device having an arm cylinder connecting bracket housed in a connecting bracket and pivotally connected to a rod end of an arm cylinder. The arm connecting bracket allows the tip of the tubular boom and the base of the tubular arm to be connected. The end part is pivotally connected between the ventral sides, and the arm cylinder connecting bracket of the tubular arm is housed in the arm connecting bracket of the tubular boom. The rear surface of the cylinder and the arm-cylinder coupling bracket have been prevented from protruding above the rear surface of the cylindrical boom and its extension, so that the rear surface of the cylindrical arm and the arm-cylinder coupling bracket may unexpectedly interfere with external obstacles during work. It is possible to prevent the risk of

According to a third aspect of the present invention, in the working apparatus according to the first or second aspect, an arm cylinder pipe arranged inside the tubular boom for supplying / discharging a working fluid to / from the arm cylinder, and a tubular shape. A working device provided with a boom and a cylindrical arm, and a working body cylinder piping for supplying and discharging a working fluid to and from the working body cylinder.
By disposing the pipe for the arm cylinder and the pipe for the work body cylinder inside the cylindrical arm and eliminating the pipe outside the cylindrical boom and cylindrical arm, pipe damage due to interference with external obstacles can be prevented. You can prevent problems. Even in the unlikely event of pipe breakage, since these pipes are inside the tubular boom or tubular arm, the pressurized fluid injected from the broken pipes and the flexibility to move around violently in the disconnected state Piping
It can be regulated by a tubular boom or a tubular arm.

According to a fourth aspect of the present invention, in the working apparatus according to the third aspect, the arm cylinder pipe connection window is opened in the tubular boom so as to face the location where the arm cylinder pipe is connected to the arm cylinder. And a work body cylinder pipe connection window opened in the cylindrical arm so as to face the location where the work body cylinder pipe is connected to the work body cylinder, and the work device is inserted into the tubular boom. The arm cylinder and the pipe for the arm cylinder can be easily connected from the outside of the tubular boom through the pipe connection window for the arm cylinder, and the work cylinder and the work cylinder pipe inserted in the tubular arm can be connected to each other. It can be easily connected from the outside of the cylindrical arm through the pipe connection window for the work body cylinder.

According to a fifth aspect of the present invention, in the working apparatus according to the third or fourth aspect, the pipe for the arm cylinder and the pipe for the work body cylinder are flexible, and are provided at the base end of the tubular boom. Provide a mounting bracket for the cylindrical boom shaft support provided, and a pipe drawing hole for drawing out the arm cylinder pipe and the work body cylinder pipe that are opened in the mounting bracket and arranged in the cylindrical boom. It is a working device equipped with a cylinder boom pipe and a work cylinder pipe in the tubular boom.The pipe was pulled out to the outside from the pipe drawing hole opened in the mounting bracket for the tubular boom shaft support. It is possible to minimize the deflection of the pipe drawing hole when the shaped boom is rotated, and it is possible to reduce the slack of the flexible pipe for the arm cylinder and the flexible pipe for the working body cylinder.

According to a sixth aspect of the present invention, in the work apparatus according to the fifth aspect, the arm cylinder pipe and the work body cylinder pipe in the tubular boom provided in the pipe drawing hole can be attached to and detached from an external pipe. It is a working device equipped with a pipe connecting means for connecting to the outside, and the pipe for the arm cylinder in the tubular boom and the pipe for the working body cylinder and the external pipe can be easily separated and connected via the pipe connecting means. It is possible to easily handle the working device that has been piped between the arm cylinder and the work body cylinder and the pipe connecting means as one unit, and to easily connect it to, for example, the machine body of the working machine. Furthermore, since the pipe connecting means provided in the pipe drawing hole fixes the flexible pipe for the arm cylinder and the flexible pipe for the work body cylinder, it is possible to restrict the violent movement of these pipes inside the tubular boom. Since the pipe lead-out hole is sealed, it is a measure against deterioration in the boom due to water entering the inside of the tubular boom through the pipe lead-out hole.

According to a seventh aspect of the present invention, in the working apparatus according to the fifth or sixth aspect, an arm coupling pin for rotatably supporting the base end portion of the tubular arm to the tip end portion of the tubular boom is provided. At the base end of the cylindrical arm, there is a pipe regulation plate that is placed above the arm coupling pin with a pipe insertion interval to regulate the upward deflection movement of the work cylinder pipe, and an opening behind the pipe regulation plate. And a pipe insertion hole for inserting a pipe for a working body cylinder, which is a flexible working body cylinder pipe inserted through the pipe insertion hole at a pipe insertion interval in the tubular arm. It is possible to prevent the oscillating movement when the cylindrical arm is rotated by the arm connecting pin and the pipe restricting plate to prevent the oscillating movement of the work cylinder cylinder from projecting to the outside of the cylindrical arm.

The invention described in claim 8 is a self-propelled lower traveling structure, an upper revolving structure provided on the lower traveling structure so as to be rotatable, and an upper revolving structure provided on the upper revolving structure. A working machine equipped with the working device according to any one of
The arm cylinder inserted inside the tubular boom and the work cylinder inserted inside the tubular arm during the traveling operation by the lower traveling body, the revolving operation by the upper revolving body, and the working operation by the working device are Since it does not interfere with the obstacles of the work machine and can prevent problems such as cylinder damage due to the interference with the obstacles, the operator of the work machine does not have to worry even if it is easily affected by the outside. The upper revolving structure and the working device can be operated, and the working efficiency can be improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in FIGS.

FIG. 1 shows a hydraulic excavator as a working machine. An upper revolving structure 13 is rotatably provided on a self-propelled lower traveling structure 11 via a revolving unit 12, and the upper revolving structure 13 is provided. In addition to the driver's seat 14, a front working device (hereinafter simply referred to as “working device”) 15 is provided.

At the mounting base of the working device 15, the upper swing body 13
A post portion 17 that is rotated around a vertical axis by a boom swing cylinder (not shown) is pivotally supported by a bracket 16 that horizontally projects from the base portion of the working device 15.

In the working device 15, a base 17 of a cylindrical boom 22 which is vertically rotated by a boom cylinder 21 is rotatably supported by a boom connecting pin 23 on a post portion 17 so that the cylinder 17 has a cylindrical shape. At the tip of the boom 22, a base end of a cylindrical arm 25 that is rotated in the front-rear direction by an arm cylinder 24 incorporated in the cylindrical boom 22 is rotatably supported by an arm coupling pin 26. At the tip of the tubular arm 25, a bucket cylinder 27 as a working body cylinder built in the tubular arm 25 is provided.
Also, a mounting bracket 31 of a bucket 29 as a working body that is rotated by the bucket linkage 28 is rotatably supported by a bucket connecting pin 32.

As the work body mounted on the tip of the tubular arm 25, not only the bucket 29 for excavation but also an attachment (not shown) such as a hydraulic breaker or a hydraulic crusher mounted in place of the bucket 29 is mounted. ) Is also included.

FIG. 2 shows an embodiment of the working device 15. The tubular boom 22 is a box-shaped box structure having a base end portion and a tip end portion opened, and the tip end of the tubular boom 22 is shown. The tubular arm 25 rotatably supported by the arm coupling pin 26 at the end is also a rectangular tubular box structure having an opening at the base end and the tip.

As shown in FIG. 2 (A), a tubular boom
In the boom cylinder 21 that rotates 22, the base end of the cylinder body is rotatably connected to the front bracket 34 of the post 17 by the boom connecting pin 33, and the rod tip of the piston rod 35 that protrudes from the cylinder body. Part is tubular boom 22
Is rotatably connected to the intermediate bracket 36 by a pin 37. A protective cover 38 is provided on the front side of the piston rod 35 so as to be slidable with respect to the cylinder body.

An arm cylinder 24 for rotating the tubular arm 25 with respect to the tubular boom 22 is inserted into the tubular boom 22 and rotatably supported by a pin 41.
Bucket 29 or attachment for 25 (not shown)
The bucket cylinder 27 that rotates is inserted into the cylindrical arm 25 and is rotatably supported by the pin 42.

Further, at the tip of the tubular boom 22, an arm connecting bracket having a shape bent toward the ventral side of the tubular boom 22 is provided.
43 is projected, and the abdominal surface side of the side plate portion of the proximal end portion of the tubular arm 25 is rotatably and axially coupled to the tip end portion of the arm coupling bracket 43 by the arm coupling pin 26.

Further, an arm cylinder coupling bracket 44 is provided on the rear side of the cylindrical arm 25 at the base end portion thereof so as not to project from the rear surface of the cylindrical arm 25, and the piston protruded from the cylinder body of the arm cylinder 24. Use the pin 46 to attach the arm cylinder connecting bracket 44 to the rod end of the rod 45.
Is rotatably coupled to the tip of the.

Then, as shown by the chain double-dashed line in FIG. 2 (A), in a stretched position in which the tubular arm 25 is located on the extension of the tubular boom 22, the arm cylinder coupling bracket 44 is
It is stored in the arm connecting bracket 43.

Inside the cylindrical boom 22, an arm cylinder pipe 47 for supplying / discharging hydraulic oil as a working fluid to / from the arm cylinder 24 is arranged, and inside the cylindrical boom 22 and the cylindrical arm 25. Is provided with a bucket cylinder pipe 48 as a work body cylinder pipe for supplying and discharging hydraulic oil to and from the bucket cylinder 27.

The arm cylinder pipe 47 and the bucket cylinder pipe 48 are pressure-resistant hoses or tubes which are flexible but can withstand high-pressure hydraulic oil.

Piping for the arm cylinder in the arm cylinder 24
Facing a plurality of places connecting 47, the arm cylinder pipe connection window 51 is opened on the side surface of the tubular boom 22, and facing a plurality of places connecting the bucket cylinder pipe 48 to the bucket cylinder 27, A bucket cylinder pipe connection window 52 as a work body cylinder pipe connection window is opened on the side surface of the cylindrical arm 25, and the arm cylinder pipe connection window 51 and the bucket cylinder pipe connection window 52 are provided at their peripheral portions. They are closed by covers 53, 54 screwed to each other.

At the tip end of the tubular arm 25, the tubular arm 25
Pair of bucket mounting brackets 55 from the box structure
And a mounting bracket 31 for the bucket 29 is rotatably supported by a bucket connecting pin 32 at the tip of the bucket mounting bracket 55.

Further, a pair of bucket mounting brackets 55
A pin 56 rotatably supports a pair of link plates 57 at the base ends thereof, and a pin 59 is provided at an intermediate portion of the link plate 57 so that the rod tip end of the piston rod 58 of the bucket cylinder 27 is pin 59. The link 62 is rotatably connected, and one end of a link 62 is rotatably connected to the tip of the link plate 57 by a pin 61. The other end of the link 62 is a bracket for mounting the bucket 29 by a pin 63. It is rotatably connected to 31.

Although the cylinder body of the bucket cylinder 27 is always housed inside the tubular arm 25, the tip end of the piston rod 58 of the bucket cylinder 27 is projected from the opening of the tip end of the tubular arm 25, It is connected to the bucket linkage 28.

The link 62 of the bucket linkage 28 may be formed in a straight line shape as shown in the drawing. However, if the link 62 is formed in a circular arc shape around the bucket connecting pin 32, there is a risk of interference with the bucket connecting pin 32. Therefore, the rotation angle of the bucket 29 can be expanded.

Further, as shown in FIG. 2A, a plate 60 is provided inside the tubular boom 22 and the tubular arm 25.
The a and 60b are attached by welding or the like. These plates 60a and 60b are shown as plate 60 in FIG.

The plate 60 is a rectangular plate curved so that the side of the arm cylinder 24 or the side of the bucket cylinder 27 is concave, and one side has a pipe for the arm cylinder.
A notch groove 60c for inserting the 47 or the bucket cylinder pipe 48 is provided.

The plate 60 functions as a reinforcing rib for the tubular boom 22 or the tubular arm 25, and serves as a guide for mounting the arm cylinder 24 or the bucket cylinder 27 inside the tubular boom 22 or the tubular arm 25. Also works as. That is, each cylinder is
These cylinders prevent 24 and 27 from being inserted further into the tubular boom 22 or tubular arm 25 than necessary.
Assembly of 24 and 27 can be done easily.

FIG. 3 shows another embodiment of the working device 15, in which the arm connecting bracket 43 is sufficiently projected to the abdominal surface side at the tip end portion of the tubular boom 22, and the base end portion of the tubular arm 25 is shown. Of the side plate portions, the abdominal surface side is rotatably and axially coupled. That is, with the arm connecting bracket 43, the tubular boom 22
The tip end of the and the base end of the cylindrical arm 25 are rotatably and axially coupled to each other between the abdominal surfaces.

Further, the arm cylinder coupling bracket 44, which is pivotally coupled to the rod tip of the piston rod 45 of the arm cylinder 24, does not protrude from the rear surface of the tubular arm 25 at the base end portion of the tubular arm 25. The movement locus 44a of the tip portion (the outer shape portion of the boss that fits with the pin 46) provided on the back side in the range is formed in a shape so as to be below the extension top 22a of the back surface of the tubular boom 22.

Therefore, the arm cylinder connecting bracket
Since it is possible to prevent the movement locus 44a of the tip end portion of 44 from protruding above the rear surface of the tubular boom 22 and its extension 22a, what angle is the angle of the tubular arm 25 with respect to the tubular boom 22? Even in this case, it is possible to prevent the arm-cylinder coupling bracket 44 from jumping above the extension 22a on the rear surface of the tubular boom 22.

Thus, it is possible to prevent the arm cylinder connecting bracket 44 from accidentally hitting an external obstacle during work in a narrow place, and the operator of the hydraulic excavator pays attention to a contact accident due to arm operation during work. Work smoothly.

Further, when the tubular arm 25 is rotated by the pulling operation of the arm cylinder 24 to the extended position positioned on the extension of the tubular boom 22, the arm cylinder connecting bracket 44 of the tubular arm 25 causes the tubular boom to move. 22 arm connection bracket 43
It is stored inside.

Next, as shown in FIG. 4, a tubular boom
A clevis-shaped mounting bracket 64 for supporting a cylindrical boom shaft is provided at the base end portion, that is, at the base portion of 22, and a pin insertion hole 65 is formed in this mounting bracket 64. A pipe drawing hole 67 for drawing out the arm cylinder pipe 47 and the bucket cylinder pipe 48 arranged in the tubular boom 22 is opened in the recess 66.

On the other hand, a plurality of bearing plate portions 68 arranged so as to sandwich the mounting bracket 64 of the tubular boom 22 are provided on the upper surface of the post portion 17 pivotally supported by the upper swing body 13 so as to swing. Since the bearing plate portions 68 are projected and the pin insertion holes 69 are formed in the bearing plate portions 68, the mounting bracket 64 is fitted between the bearing plate portions 68 to align the pin insertion holes 65 and 69. , The boom insertion pin divided into two in these pin insertion holes 65, 69
Insert 23 from each side.

The post portion 17 is provided with a pin insertion hole 70 for a swing pin which serves as a swing center when the post portion 17 swings and swings.

A plate is attached to one end of each boom connecting pin 23.
71 is integrated at a right angle, and the bolt insertion hole is
Since the screw holes 73 are provided in the side surfaces of the post portion 17 that face each other, the pin insertion holes 65,
When the boom connecting pin 23 is inserted into the 69, the bolt 75 inserted into the bolt insertion hole 72 of the plate 71 via the washer 74
The boom connecting pin 23 can be fixed to the side surface of the post portion 17 by screwing into the screw hole 73 formed in the side surface portion of the post portion 17.

Then, the arm cylinder pipe 47 and the bucket cylinder pipe shown in FIG. 2A or FIG.
48 is once drawn out to the recess 66 from the pipe drawing hole 67 at the base of the tubular boom 22 shown in FIG.
As shown in FIG. 2 (A) or FIG. 3, the recess 76 formed in the center of the upper surface of the post portion 17 is drawn into the inside of the post portion 17, and the recessed portion of the middle portion of the post portion 17 is drawn.
It is pulled out from 77 to the upper revolving structure 13 side.

On the other hand, the boom cylinder pipe 78 connected to both ends of the cylinder body of the boom cylinder 21 passes through the restraint plate 79 provided on the side surface of the boom, and similarly, the post portion.
It is pulled into the inside of the post part 17 from the recess 76 of the 17
It is pulled out to the upper revolving structure 13 side from the concave portion 77 of the middle stage portion.

Since the boom connecting pin 23 is divided into two parts so as not to project into the recess 76 of the post portion 17, this recess
A sufficient space for inserting the pipe can be secured in 76.

FIG. 5 (A) shows a swing shaft supporting portion of the post portion 17 for mounting the tubular boom, and the swing pin 80 which is the swing center when swinging the post portion 17 is It is inserted into the pin insertion hole 70. The swing pin 80 is formed in a hollow cylindrical shape as shown in FIG.

At the upper end of the swing pin 80, a plate is
Since the plate 80a is integrally formed at a right angle and the plate 80a is provided with a bolt insertion hole 80b and the post portion 17 is provided with a screw hole 80c on the upper surface thereof, the swing pin is inserted into the pin insertion hole 70. When the 80 is inserted, the bolt 80e inserted through the washer 80d into the bolt insertion hole 80b of the swing pin 80 is screwed into the screw hole 80c of the post 17 to fix the swing pin 80 to the post 17. it can.

The arm cylinder pipe 47, the bucket cylinder pipe 48, and the boom cylinder pipe 78 are inserted into the inner space of the swing pin 80 formed in the hollow portion and inserted into the post 17 as described above. Pull out to the upper revolving structure 13 side.

FIG. 6 shows a cross section of the tubular boom 22. The tubular boom 22 has a back plate portion 81 on the back side and a belly plate portion 82 on the abdominal surface side.
And side plate portions 83, 84 on both the left and right sides are a rectangular tubular box structure welded in a quadrangular cross section so as to surround the four sides of the arm cylinder 24.

FIG. 7 shows the tip of the tubular boom 22. The arm coupling pin 26 allows the base end of the tubular arm 25 to rotate freely inside the arm connecting bracket 43 at the tip of the tubular boom 22. The rod rod end of the piston rod 45 of the arm cylinder 24 that is pivotally supported by the cylindrical boom 22 protrudes from the pin 46 between the arm cylinder connecting brackets 44 of the tubular arm 25.
Are connected by.

FIG. 8 shows the base end portion of the cylindrical arm 25, and a pipe for restricting the runout movement of the bucket cylinder pipe 48 above the arm coupling pin 26 via the pipe insertion interval 85. A regulation plate 86 is arranged. This piping regulation plate 86
Is a bracket mounting base to which the arm cylinder connecting bracket 44 is welded, and the cylindrical arm 25
It is also part of the box structure.

Further, a pipe insertion hole 87 for inserting the bucket cylinder pipe 48 is opened behind the pipe restriction plate 86.

The pipe insertion hole 87 may be formed not only in the illustrated rectangular shape but also in an elliptical shape or a circular shape. The opening edge portion of the pipe insertion hole 87 is formed of synthetic resin or rubber material. A pipe protecting material 87a such as a guard member and a grommet is fitted.

FIG. 9 shows an example in which, as the pipe protection material 87a, a guard member 87a1 having a concave cross section as shown in (A) and a long and end shape as shown in (B) is used. And
Connect one guard member 87a1 to the pipe insertion hole 87 of the tubular arm 25.
It is fitted endlessly on the opening edge of.

FIG. 10 shows (A) as the pipe protecting material 87a.
This is an example in which a grommet 87a2 having a concave cross section as shown in (B) and formed in an endless circle shape is used as shown in (B), and this grommet 87a2 is formed on the opening edge of the circular pipe insertion hole 87. Fit in. In addition, in the elliptical pipe insertion hole 87,
It is better to fit an oval grommet.

FIG. 11A shows a cross section of the tubular arm 25. The back plate portion 88 on the back side, the belly plate portion 89 on the abdominal surface, and the side plate portions 90, 91 on the left and right sides are the bucket cylinders. It is a rectangular tubular box structure welded to a square cross section so as to surround 27 squares.

FIG. 11B shows a modified example of the cylindrical arm 25, in which a back plate portion 88a bent in a kamaboko shape is welded on the abdominal plate portion 89 on the abdominal surface side. Is.

FIG. 12 shows the tip of the cylindrical arm 25,
The rod tip of the piston rod 58 of the bucket cylinder 27 projects from the tip opening 92 of the tubular arm 25 of the box structure, but a pair that is rotatably supported by a pin 56 in the bucket mounting bracket 55. Since it is connected by the pin 59 between the intermediate portions of the link plate 57 of FIG. 2, the piston rod 58 of the bucket cylinder 27 is protected by the bucket mounting bracket 55 as shown in FIG. 2 (A) or FIG. Since it is within the movement trajectory of the link plate 57, it is possible to prevent an unexpected interference between the piston rod 58 and the obstacle.

Next, a method of mounting the arm cylinder 24 and the bucket cylinder 27 will be described. The arm cylinder 24 and the bucket cylinder 27 have the same shape as the conventional ones.
Insert the cylindrical boom 22 and the cylindrical arm 25 into the inside through the openings on the tip end side.
If the cylinders 25 and 27 are pushed to the pin hole positions locked by the plates 60a and 60b provided inside the cylindrical arm 25, respectively, the cylinders 24 and 27 can be prevented from going further than necessary and each cylinder 24, 27 can be installed smoothly.

The pin 41 that pivotally supports the arm cylinder 24 is inserted from the outside into the side plate portion on the other side of the cylindrical boom 22 from the side plate portion on one side of the cylindrical boom 22 through the mounting hole at the base end of the cylinder. Further, the pin 42 that pivotally supports the bucket cylinder 27 is inserted from the outside into the side plate portion on the other side of the cylindrical arm 25 from the side plate portion on one side of the cylindrical arm 25 through the mounting hole at the cylinder base end. .

These pins 41 and 42 are fixed by bolts 75 screwed into the side plate portions of the cylindrical boom 22 and the cylindrical arm 25 through the washers and plates, similarly to the boom connecting pin 23 shown in FIG. To do.

Further, an arm cylinder pipe connection window 51 and a bucket cylinder pipe connection window 52 are provided as access windows near one end of the cylinder body of arm cylinder 24 and bucket cylinder 27 and the other end of the cylinder body. Since these access windows are closed by covers 53, 54 screwed together, the arm cylinder piping connection window 51 and the bucket cylinder piping connection opened by removing these covers 53, 54. Connect the arm cylinder 24 and the arm cylinder pipe 47 through the window 52, connect the bucket cylinder 27 and the bucket cylinder pipe 48, and cover when the pipe connection is completed.
Closed by 53, 54.

Next, the function and effect of the embodiment shown in FIGS. 1 to 12 will be described.

Since the arm cylinder 24 is inserted into the tubular boom 22 and the bucket cylinder 27 is inserted into the tubular arm 25, it projects to the rear side of the tubular boom 22 and the tubular arm 25. Cylinder is gone, driver's seat
It is possible to prevent problems such as cylinder damage due to interference with obstacles located above that are hard to see from 14 operators.

In particular, the tubular boom 22 and the tubular arm 25
6 is a solid cylindrical structure as shown in FIGS. 6 and 11, there is no risk of deformation and the intrusion of external obstacles is reliably prevented, so that the internal arm cylinder 24 and bucket cylinder 27 are protected. It can be surely protected.

The arm connecting bracket 43 provided at the tip of the tubular boom 22 is formed into the curved plate shape shown in FIG. 2 (A) or FIG. 3, and the tip of the tubular boom 22 and the tubular arm 25.
The base end of the cylindrical arm 25 is rotatably pivoted between the abdominal surfaces, and the tubular arm 25 is tubularly formed by the pulling operation of the arm cylinder 24 as shown by a two-dot chain line in FIG. When extended above the extension of the boom 22, the arm cylinder coupling bracket 44 of the tubular arm 25 is housed in the arm coupling bracket 43 of the tubular boom 22, and the rear surface of the tubular arm 25 and the arm cylinder coupling bracket 44 are accommodated. Since it is possible to prevent the above from projecting upward from the rear surface of the cylindrical boom 22 and its extension, it is possible to prevent the possibility that these may unexpectedly interfere with an external obstacle during work.

In particular, in the embodiment shown in FIG. 3, the movement locus 44a of the tip of the arm cylinder connecting bracket 44 is shown.
Is positioned below the rear surface of the tubular boom 22 and its extension 22a, so that the arm cylinder coupling bracket 44 is tubular regardless of the angle of the tubular arm 25 with respect to the tubular boom 22. It is possible to prevent the boom 22 from jumping above the extension 22a on the rear side of the boom 22.This prevents the arm cylinder connecting bracket 44 from accidentally hitting an external obstacle during work in a narrow space. The operator can work smoothly without paying attention to contact accidents caused by arm movements during work.

Since the arm cylinder pipe 47 and the bucket cylinder pipe 48 are provided inside the tubular boom 22, and the bucket cylinder pipe 48 is provided inside the tubular arm 25, the tubular boom 22 and Piping outside the cylindrical arm 25 becomes unnecessary, and it is possible to prevent a failure of piping breakage that occurs when these piping interfere with an external obstacle.

When an attachment such as a hydraulic breaker or a hydraulic crusher is attached to the tip of the tubular arm 25 in place of the bucket 29, the pipe for supplying hydraulic oil to the attachment is connected to the tubular boom 22 and the tubular boom. By arranging the arm 25 inside the arm 25, it is possible to prevent the failure of pipe damage due to interference with an external obstacle.

Even if the pipes are broken, since those pipes are inside the cylindrical boom 22 or the cylindrical arm 25, the pressurized fluid jetted from the broken pipe or the disconnected state cannot be detected. Flexible piping that moves around violently can be regulated by the tubular boom 22 and the tubular arm 25.

By removing the covers 53 and 54 screwed to the side surfaces of the tubular boom 22 and the tubular arm 25, the tubular boom 22 is removed.
The arm cylinder 24 and the arm cylinder pipe 47 inserted therein can be easily connected from the outside of the tubular boom 22 through the arm cylinder pipe connection window 51, and the bucket cylinder 27 inserted in the tubular arm 25. And bucket cylinder piping 48, bucket cylinder piping connection window 52
Can be easily connected from the outside of the cylindrical arm 25.

Piping 47 for the arm cylinder in the tubular boom 22
The pipe 48 for the bucket cylinder and the pipe 48 for the bucket cylinder are drawn to the outside from the pipe drawing hole 67 opened in the mounting bracket 64 for the cylindrical boom shaft support as shown in FIG.
Flexible piping for arm cylinders that minimizes the runout of the piping outlet 67 when turning 22.
The slack of the pipe 47 and the bucket cylinder pipe 48 can be reduced.

The flexible bucket cylinder pipe 48 inserted into the pipe insertion space 85 in the tubular arm 25 through the pipe insertion hole 87 shown in FIG. 8 is a flexible portion of the pipe when the tubular arm 25 is rotated. Although a force in the expansion / contraction direction acts on the wobbling movement, the wobbling movement of the bucket cylinder pipe 48 is restricted by the arm coupling pin 26 and the pipe regulation plate 86, and the wobbling movement of the bucket cylinder pipe 48 It is possible to prevent the shaped arm 25 from protruding to the outside.

Particularly, when the tubular arm 25 is extended above the extension of the tubular boom 22, the bucket cylinder pipe 48 bends upward and hits the inner surface of the pipe restricting plate 86 constituting the tubular arm 25. , Never fly outside.

The hydraulic excavator shown in FIG. 1 is an arm cylinder inserted into the tubular boom 22 by the traveling operation by the lower traveling body 11, the revolving operation by the upper revolving body 13 and the working operation by the working device 15. 24 and the bucket cylinder 27 inserted inside the tubular arm 25 do not interfere with external obstacles, and it is possible to prevent problems such as cylinder damage due to interference with obstacles. Even in a place that is easily affected, the operator of the work machine can operate the lower traveling body 11, the upper revolving structure 13 and the working device 15 with peace of mind and improve work efficiency.

That is, the arm cylinder 24 is built in the tubular boom 22 of the box structure, and the bucket cylinder 27
Is built in the tubular arm 25 of the box structure,
These cylinders are not affected by the outside, and similarly, the arm cylinder pipe 47 and the bucket cylinder pipe 48 are also not affected by the outside. Since there is no damage to the items, the operator can work with peace of mind when working in a place that is easily affected by external factors, such as a house demolition site.

Even if the arm cylinder 24, the bucket cylinder 27, and the hydraulic pipes are damaged, since they are in the tubular boom 22 and the tubular arm 25, the high-pressure hydraulic oil is directly ejected to the outside. There is no such thing.

Further, since the arm cylinder 24, the bucket cylinder 27, and their hydraulic pipes are housed inside the tubular boom 22 and the tubular arm 25, the design can be neat.

As described above, the arm cylinder 24 and the bucket cylinder 27 are connected to the tubular boom 22 and the tubular arm 25, respectively.
Installed inside the bucket linkage 28 link plate
57 is also mounted in the bucket mounting bracket 55 to satisfy the conventional function, and the arm cylinder pipe 47 and the bucket cylinder pipe 48 pass through the inside of the tubular boom 22 and the tubular arm 25, so that they are used for protection. No guards, covers, etc. are required.

Next, the arm cylinder pipe 47 and the bucket cylinder pipe 48 are connected to the pipe drawing hole 67 of the tubular boom 22.
Although it may be drawn out from the pipe as it is, as shown in FIGS. 13 and 14, a pipe connecting means 93 is provided in the pipe drawing hole 67 at the base end portion of the tubular boom 22, and the pipe connecting means 93 is provided.
The arm cylinder pipe 47 and the bucket cylinder pipe 48 in the tubular boom 22 may be detachably connected to an external pipe via the.

That is, as shown in FIG. 13 (A), the pipe connecting plate 94 is screwed into the concave portion 66 of the tubular boom 22 in which the pipe drawing hole 67 is provided, and the pipe connecting plate 94 is drilled. The union 96 is inserted into the plural union insertion holes 95 as shown in (B), and the nut 97 screwed to the union 96 and the union central hexagonal portion 96a sandwich the pipe connection plate 94, and the union 96 is inserted. To fix. The arm cylinder pipe 47 or the bucket cylinder pipe 48 is connected to one of the unions 96, and the pipe (hose) drawn from the upper swing body 13 is connected to the other of the unions 96 protruding from the nut 97.

FIG. 14 shows another example of the pipe connecting means 93. A pipe connecting block 98 is attached in place of the pipe connecting plate 94 in the recess 66 of the tubular boom 22 in which the pipe drawing hole 67 is provided. Connect the arm cylinder pipe 47 or bucket cylinder pipe 48 to the screw hole 99 of the pipe connection block 98 via the pipe connector 100, and connect the pipe (hose) drawn from the upper revolving unit 13 to the opposite side of the screw hole 99. Connecting.

In any of the cases shown in FIGS. 13 and 14, the tubular boom 22 is connected through the pipe connecting means 93.
The inner arm cylinder pipe 47 and the bucket cylinder pipe 48 can be easily separated from and connected to the external pipe, and the working device 15 is already piped between the arm cylinder 24 and the bucket cylinder 27 and the pipe connecting means 93. Can be easily handled as one unit,
For example, it can be easily connected to the body of a work machine.

Further, the pipe connection plate 94 and the pipe connection block 98 are flexible arm cylinder pipes.
Since the pipe 47 and the bucket cylinder pipe 48 are fixed, it is possible to restrict the violent movement of these pipes inside the tubular boom 22, and since the pipe lead-out hole 67 is sealed, the inside of the tubular boom 22 can be inserted from the pipe lead-out hole 67. It is possible to prevent the ingress of water, etc., and to prevent deterioration in the boom (such as rust) due to water.

[0090]

According to the first aspect of the present invention, since the arm cylinder is inserted inside the tubular boom and the working body cylinder is inserted inside the tubular arm, the tubular boom and the tubular boom are provided. Since there is no cylinder protruding to the rear side of the arm, problems such as cylinder damage due to interference with external obstacles can be prevented. In particular, the tubular boom and tubular arm are robust tubular structures, so there is no risk of deformation and the intrusion of external obstacles is reliably prevented, ensuring reliable protection of the internal arm cylinder and work cylinder. it can.

According to the second aspect of the present invention, the distal end portion of the tubular boom and the proximal end portion of the tubular arm are rotatably axially coupled to each other on the ventral side by the arm connecting bracket, and the tubular arm is also provided. The arm-cylinder connecting bracket of is stored in the arm-connecting bracket of the tubular boom to prevent the rear surface of the tubular arm and the arm-cylinder connecting bracket from protruding above the rear surface of the tubular boom and its extension. Therefore, it is possible to prevent the rear surface of the cylindrical arm and the arm cylinder connecting bracket from abruptly interfering with an external obstacle during the work.

According to the third aspect of the present invention, the pipe for the arm cylinder and the pipe for the work body cylinder are provided inside the tubular boom and the tubular arm, and the pipe for the outside of the tubular boom and the tubular arm is provided. By eliminating the pipe, it is possible to prevent the problem of pipe damage due to interference with external obstacles. Even in the unlikely event of pipe breakage, since these pipes are inside the tubular boom or tubular arm, the pressurized fluid injected from the broken pipes and the flexibility to move around violently in the disconnected state The piping can be regulated by a tubular boom or a tubular arm.

According to the fourth aspect of the invention, the arm cylinder inserted into the tubular boom and the arm cylinder pipe can be easily connected from the outside of the tubular boom through the arm cylinder pipe connection window, and The work cylinder inserted into the cylindrical arm and the work cylinder piping can be easily connected from the outside of the cylinder arm through the work cylinder piping connection window.

According to the fifth aspect of the present invention, the pipe for the arm cylinder and the pipe for the working body cylinder in the tubular boom are provided outside the pipe lead-out hole opened in the mounting bracket for the tubular boom shaft support. Since it is pulled out, it is possible to minimize the deflection of the pipe lead-out hole when the tubular boom is rotated, and it is possible to reduce the slack of the flexible arm cylinder pipe and work body cylinder pipe.

According to the sixth aspect of the invention, the pipe for the arm cylinder and the pipe for the working body cylinder in the tubular boom and the external pipe can be easily separated and connected via the pipe connecting means. It is possible to easily handle the working device that has been piped between the arm cylinder and the work body cylinder and the pipe connecting means as one unit, and to easily connect it to, for example, the machine body of the working machine. Furthermore, the pipe connecting means provided in the pipe drawing hole is
By fixing the flexible arm cylinder piping and work cylinder piping, it is possible to restrict the movement of these pipes inside the tubular boom, and to seal the pipe drawing hole so This is a measure to prevent deterioration of the inside of the boom due to water that has entered the boom.

According to the seventh aspect of the invention, the deflection movement of the flexible working cylinder pipe inserted through the pipe insertion hole at the pipe insertion interval in the tubular arm when the cylindrical arm is rotated is performed. The arm coupling pin and the pipe restricting plate can be restricted to prevent the oscillating movement of the work cylinder cylinder from protruding to the outside of the cylindrical arm.

According to the eighth aspect of the present invention, the arm cylinder inserted into the tubular boom and the tubular shape are inserted in the traveling operation by the lower traveling body, the revolving operation by the upper revolving body, and the working operation by the working device. The work cylinder inserted inside the arm does not interfere with external obstacles,
Since it is possible to prevent problems such as cylinder damage due to interference with obstacles, the operator of the work machine can be assured that the undercarriage is safe even in places that are easily affected by external influences.
The upper revolving structure and the working device can be operated, and the working efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a working machine according to the present invention.

FIG. 2A is a front view showing an embodiment of a work device in the same working machine, and FIG. 2B is a perspective view showing one component in the work device.

FIG. 3 is a front view showing another embodiment of the work device in the same work machine.

FIG. 4 is an exploded perspective view of a tubular boom mounting portion of the above working apparatus.

FIG. 5A is an exploded perspective view showing a modified example of a swing shaft supporting portion of a post for mounting a tubular boom in the working apparatus, and FIG. 5B is a side view showing the swing pin.

FIG. 6 is a cross-sectional view of a cylindrical boom in the above working device.

FIG. 7 is a plan view of a tip end portion of a tubular boom in the above working device.

FIG. 8 is a perspective view in which a side surface of a base end portion of a cylindrical arm in the working device is cut away.

FIG. 9 (A) is a sectional view showing an example of a pipe protecting material used for a pipe insertion hole of a cylindrical arm in the same working apparatus;
(B) is an overall front view of the pipe protecting material.

FIG. 10 (A) is a cross-sectional view showing another example of the pipe protecting material, and FIG. 10 (B) is a front view thereof.

FIG. 11 (A) is a cross-sectional view of a tubular arm in the same working apparatus, and FIG. 11 (B) is a cross-sectional view showing a modified example of the tubular arm.

FIG. 12 is a plan view of a tip end portion of a cylindrical arm in the same working apparatus.

FIG. 13 (A) is a perspective view showing an embodiment in which a pipe connecting plate of pipe connecting means is attached to a cylindrical boom root portion of the same working device, and FIG. 13 (B) is an exploded perspective view showing the pipe connecting means. is there.

FIG. 14 is an exploded perspective view showing another embodiment of the above pipe connecting means.

FIG. 15 is a front view showing a conventional work machine.

[Explanation of symbols]

11 Undercarriage 13 Upper revolving structure 15 Working device 22 Cylindrical boom 24 Arm cylinder 25 Cylindrical arm 26 Arm connecting pin 27 Bucket cylinder as working body cylinder 29 Bucket as working body 43 Arm connecting bracket 44 Arm cylinder connecting bracket 47 Piping for arm cylinder 48 Piping for bucket cylinder as piping for work cylinder 51 Piping connection window for arm cylinder 52 Piping connection window for bucket cylinder as piping connection window for work cylinder 64 Mounting bracket 67 Piping hole 85 Piping insertion interval 86 Piping regulation plate 87 Piping insertion hole 93 Piping connection means

Claims (8)

[Claims] 1. A box-shaped tubular boom having a base end portion and a tip end portion opened, and a box structure having a base end portion and a tip end portion rotatably supported by the tip end of the tubular boom. A cylindrical arm, an arm cylinder that is inserted into the cylindrical boom and is rotatably supported, and that rotates the cylindrical arm with respect to the cylindrical boom, and is rotatably supported by the tip of the cylindrical arm. And a working body cylinder that is inserted into the inside of the cylindrical arm and is rotatably supported to rotate the working body with respect to the cylindrical arm. 2. An arm connecting bracket which is projecting to the abdominal surface side at the tip of the tubular boom and is pivotally coupled to the abdominal surface side of the side plate portion of the base end portion of the tubular arm, and the tubular arm of the tubular arm. It is provided on the rear side within the range that does not protrude from the rear side at the base end, and is stored in the arm connecting bracket of the cylindrical boom in an extended position that is located on the extension of the cylindrical boom, and is pivotally rotatable with the rod cylinder rod tip. The working device according to claim 1, further comprising a coupled arm cylinder coupling bracket. 3. An arm cylinder pipe arranged inside the tubular boom for supplying / discharging working fluid to / from the arm cylinder, and a working fluid arranged inside the cylindrical boom and the cylindrical arm for supplying working fluid to the working body cylinder. The work device according to claim 1 or 2, further comprising: a pipe for a work body cylinder to be discharged. 4. An arm cylinder pipe connection window opened in the tubular boom so as to face a position where the arm cylinder pipe is connected to the arm cylinder, and a position where the work body cylinder pipe is connected to the work body cylinder. 4. The working device according to claim 3, further comprising: a pipe connecting window for a working body cylinder opened to the cylindrical arm. 5. The arm cylinder pipe and the work body cylinder pipe have flexibility, and a mounting bracket for a cylindrical boom shaft support provided at a base end portion of the cylindrical boom and an opening in the mounting bracket. 5. The working apparatus according to claim 3, further comprising a pipe drawing hole for drawing the arm cylinder pipe and the work cylinder pipe arranged inside the cylindrical boom. 6. A pipe connecting means for detachably connecting the pipe for the arm cylinder and the pipe for the work body cylinder in the tubular boom, which is provided in the pipe drawing hole, to the external pipe in a detachable manner. The working device described. 7. An arm coupling pin that rotatably pivotally supports a base end portion of a tubular arm at a tip end portion of a tubular boom, and a pipe insertion interval above the arm coupling pin at a base end portion of the tubular arm. A pipe restricting plate for restricting the upward deflection of the work cylinder pipe, and a pipe insertion hole opened at the rear of the pipe restricting plate for inserting the work cylinder pipe. The working device according to claim 5 or 6, characterized in that. 8. A self-propelled lower traveling structure, an upper revolving structure provided on the lower traveling structure so as to be rotatable, and a working device according to claim 1 provided on the upper revolving structure. A working machine comprising: