JP2000319931A - Piping structure of turning work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the constitution of a small excavating work vehicle capable of excavating a side-ditch in a passable alley of a crawler type traveling device by arranging an excavator such as a boom, an arm and a bucket in a front part of a seat, and arranging a turning frame in a width of the crawler type traveling device. SOLUTION: Piping 70, 71, 72 for a cylinder are supported by an inverse side side surface of an arranging position of a cabin of first/second booms 61, 62 to be branched off into piping 70 for an offset cylinder and piping 71, 72 for an arm cylinder and a bucket cylinder in a side surface tip part of the first boom 61, and the piping 70 changes a passage to the inverse side surface side to be connected to the offset cylinder on an inverse side surface of the second boom. The piping 71, 72 are constituted so as to be supported by the upper surface side of a third boom 63, and piping covering covers 81, 82, 83 are arranged on a side surface of the first/second/third booms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler-type traveling device in which a digging device such as a boom, an arm, and a bucket is disposed at a front portion of a seat and a turning frame is disposed within the width of the crawler-type traveling device. The present invention relates to a configuration of a small excavation work vehicle capable of digging a gutter in a passable alley.

[0002]

2. Description of the Related Art Conventionally, an arm is connected to the end of a boom, a bucket is connected to the end of the arm, and the boom is composed of first, second, and third booms. BACKGROUND ART A turning work vehicle configured to perform an excavation operation by turning is known. The cylinder piping for operating the boom, the arm, and the bucket is configured to be supported on the rear surface side of the boom.

[0003]

However, in the above prior art, a pipe 90 is supported on the rear side of the first boom 91 and the second boom 92 as shown in FIG. Therefore, the connecting portion 94 of the first boom 91 and the second boom 92
Then, at the connecting portion 95 between the second boom 92 and the third boom 93, the pipe 90 protrudes rearward as the work implement rotates. When the working machine is rotated to the rear of the worker on the side of the cabin, the working machine may interfere with an obstacle at a position invisible to the worker, so that improvement is required.

[0004]

The above is the problem to be solved by the present invention. Next, means for solving the problem will be described. That is, in a turning work vehicle having a working machine including a first boom, a second boom, a third boom, an arm, and a bucket, piping for a cylinder that operates the working machine is connected to the first boom and the second boom. It was configured to be supported on the side.

[0005] Further, the pipe is supported on a side surface of the first boom and the second boom on the side opposite to the cabin arrangement position.

[0006] The pipe is branched into a pipe for an offset cylinder and a pipe for an arm cylinder and a bucket cylinder at a front end portion of the side face of the first boom, and the pipe for the offset cylinder is routed to the opposite side. Change
The opposite side of the second boom is connected to the offset cylinder.

Further, the piping for the arm cylinder and the bucket cylinder is configured to be supported on the upper surface side of the third boom.

Further, the pipe-covering cover is provided on a side surface of the first boom, the second boom, and the third boom.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is an overall side view of a turning work vehicle according to the present invention, FIG. 2 is a left side view of a boom and a turning table, FIG. 3 is a rear view of the boom, FIG. 4 is a right side view of the boom, FIG.
7 is a top view of the third boom, FIG. 6 is a left side view of the third boom and the arm, FIG. 7A is a plan view of the first cover, FIG.
7B is a side view of the first cover, FIG. 7C is a front view of the first cover (view from inside), FIG. 7D is a bottom view of the first cover, and FIG. Is a front view of the second cover, FIG.
9B is a plan view and a bottom view of the second cover, FIG. 9A is a front view of the third cover, FIG. 9B is a side view of the third cover, and FIG. 10 is a left side view of the conventional working machine. is there.

First, the overall configuration of the turning work vehicle according to the present invention will be described. In FIG. 1, the turning work vehicle has a turning table bearing 7 arranged at the upper center of the crawler traveling device 1,
The swivel table 8 is supported by the swivel table bearing 7 so that the swivel table 8 can be swiveled left and right. Further, at the front and rear ends of the crawler type traveling device 1 (the front side in the embodiment shown in FIG. 1), the earth discharging plate 10 is disposed so as to be vertically rotatable.

A hood 9 and a cabin 21 for covering an engine, a fuel tank, and the like (not shown) are provided above the swivel 8. A canopy 22 is provided above the hood 9 and the cabin 21. A lower end of the boom 6 is pivotally supported on a boom bracket attached to a front end of the revolving base 8 so as to be vertically rotatable. The boom 6 includes a first boom 61, a second boom 62, and a third boom 63.
At the distal end of the first boom 61 pivotally supported in a vertically rotatable manner, the second boom 62 is pivotally supported in a laterally rotatable manner, and further at the distal end of the second boom 62, The third boom 63 is pivotally supported so as to freely roll in the left-right direction. The distal end of the third boom 63 pivotally supports the arm 5, and the distal end of the arm 5 pivotally supports the bucket 4, which is a work attachment. The work implement 2 is configured by the boom 6, the arm 5, the bucket 4, and the like. The second boom 62 is rotated left and right by the boom cylinder 26, the arm 5 is vertically rotated by the arm cylinder 25, and the bucket 4 is vertically rotated by the bucket cylinder 24.

A hydraulic oil tank and a fuel tank are mounted on the upper part of the swivel 8, and the whole is covered with a bonnet 9. The hood 9 has a substantially half-moon shape in plan view and is disposed on the rear portion of the swivel 8. A cabin 21 and a canopy 22 are mounted near the center of the hood 9. An operation lever and the like for operating the traveling device 1 are arranged.

Next, the piping structure of the working machine 2 according to the present invention will be described. FIG. 2 shows the swivel 8 and the left side surface of the work machine 2. As shown in the drawing, a first boom 61 is supported rotatably up and down at a rotation fulcrum 61 a of the swivel 8, and a rotation fulcrum 62 a is provided at the tip of the first boom 61.
The second boom 62 is connected to be rotatable in the left-right direction. Further, a third boom 63 is connected to a distal end portion of the second boom 62 so as to freely roll left and right.

A first boom cylinder 27 is interposed between the tip of the first boom 61 and the swivel table 8, and the first boom cylinder 27 is rotatably supported at a rotation fulcrum 27a. The first boom 61 is configured to rotate up and down by expanding and contracting the first boom cylinder 27.

An offset cylinder 26 is interposed between the distal end of the second boom 62 and the first boom 61, and the second boom 62 is rotated in the left-right direction by the expansion and contraction of the offset cylinder 26. It is configured as follows. Also,
As shown in FIGS. 2 and 3, a third boom 63 is supported at the front end of the second boom 62 so as to be freely rollable in the left-right direction, and is provided between the rear end of the third boom 63 and the first boom 61. Is provided with the parallel link 28, and the second boom 62
The third boom 63, which swings with the left and right rotation, does not tilt left and right, and always has its upper surface (as viewed from an arrow 63U shown in FIGS. 1 and 3).
Side) is directed substantially upward.

In the present invention, as shown in FIG. 4, piping for supplying hydraulic oil to each cylinder is supported on the side surfaces (the right side surface in the present embodiment) of the first boom 61 and the second boom 62. Have been. The pipes include a pipe 70 for supplying hydraulic oil to the offset cylinder 26, a pipe 71 for supplying hydraulic oil to the arm cylinder 25, and a pipe 72 for supplying hydraulic oil to the bucket cylinder 24. , Two pipes each, a total of six pipes 70
The first cover 8 extends from a pump (not shown) in the swivel 8 and is attached to the left side surface of the first boom 61.
1 is guided into the first cover 81 from the lower opening 81b.

As shown in FIG. 7, the first cover 81 is a cover having a substantially trapezoidal shape when viewed from the front. The left and right sides are bent and closed, and the upper and lower parts are opened to open pipes for inserting pipes. It has an upper opening 81a and a lower opening 81b. In addition, buffer members 81c and 81c are attached to the upper opening 81a and the lower opening 81b, respectively, along the inner surface of the cover, so that the pipes 70, 71 and 72 are not damaged at the opening of the first cover 81. Make up. With such a configuration, it is possible to protect a plurality of pipes with a single cover without the need for a guide holder or the like, and pipes 70, 71, 72 can be formed on substantially the entire side surface of the first boom 61. It is now possible to protect.

Then, as shown in FIG.
Inside, the pipes 70, 71, 72 extending upward from the side surface of the first boom 61 are branched into the pipe 70 and the pipes 71, 72 at the distal end of the first boom 61. Piping 71.7
Reference numeral 2 extends upward from the upper opening 81a of the first cover 81, passes through the side surface of the connecting portion between the first boom 61 and the second boom 62, and is attached to the right side surface of the second boom 62 further above. The second cover 82 is guided into the second cover 82 from the lower opening 82 b of the second cover 82.

As shown in FIG. 8, the second cover 82 is a cover having a substantially parallelogram shape as viewed from the front. The left and right sides are bent and closed, and the upper and lower parts are opened to open the pipes respectively. Has an upper opening 82a and a lower opening 82b. Similarly to the first cover 81, buffer members 82c are attached to the upper and lower openings 82a and 82b to protect the pipes 71 and 72. Thus, the second cover 82 can protect the pipes 71 and 72 over substantially the entire side surface of the second boom 62.

On the other hand, the pipe 70 extends upward from the upper opening portion 81a of the first cover 81, and as shown in FIGS. 3 and 4, the connecting portion between the first boom 61 and the second boom 62 is provided inside the boom. Bend the path to the side (left side)
1 and extends to the opposite side surface (the left side of the boom) of the connecting portion, passing through the space between the bracket 61b provided at the distal end of the first and the rotation fulcrum 62a of the second boom 62. At this time, the pipe 70 is connected to the guide member 61c attached to the bracket 61b.
To prevent interference with the rotational movement of the second boom 62. And the piping 70 is the second boom 6
2 is connected to the cylinder part of the offset cylinder 26 disposed on the left side of the second cylinder. With this configuration, the piping 71
72 will be located on the opposite side of the second boom 62,
A reasonable layout became possible without interference between the two.

The pipes 71 and 72 extend upward on the right side surface of the second boom 62 in the second cover 82, and extend upward from the upper opening 82a of the second cover 82, After passing through the right side of the connecting portion between the second boom 62 and the third boom 63, it is inserted from the lower opening 83 b into the third cover 83 mounted on the right side of the rear end of the third boom 63. And on the right side of the rear end of the third boom 63, a pipe 71
An insertion hole 72 is formed, and the pipes 71 and 72 inserted into the third cover 83 protrude into the third boom 63 through the insertion hole. As shown in FIG. 9, the third cover 83 is a cover having a hexagonal shape as viewed from the front, the upper and side portions are bent and closed, and only the lower portion is opened to form a lower opening 83b.

As described above, according to the present invention, the piping 70
-Since 71 and 72 are configured to be supported on the side surfaces (the right side surface in the present embodiment) of the first boom 61 and the second boom 62, when the work machine 2 is rotated to the rear side of the cabin 21, Also, as in the conventional configuration shown in FIG.
The pipe does not protrude rearward at the connecting portion of the boom, and stable workability without interfering with a rearward obstacle can be ensured.

In this embodiment, the cabin 21
The rotation support point 61 a of the first boom 61 is disposed on the right side of the turning table 8, so that the rotation center of the work machine 2 is eccentric to the right side of the center of the swivel 8. For this reason, the pipes 70 and 71
By setting the support position of the boom 6 on the right side surface of the boom, that is, the side surface opposite to the position where the cabin 21 of the first boom 61 and the second boom 62 is disposed, the boom 6 is turned as much as possible
, So as to be compatible with the operability of the work machine 2. In addition, the piping 7
0, 71 and 72 are provided to avoid getting caught in the cabin during rotation.

The pipes 71 and 72 protruding inward of the third boom 63 are guided to the upper surface side of the third boom 63 as shown in FIGS. And, a pipe 71 extending between the third boom 63 and the arm cylinder 25.
Of the 72, two pipes 71 for feeding oil to the arm cylinder 25 are connected to the cylinder portion of the arm cylinder 25. Then, the remaining two pipes 72 are further extended, pass inside the connecting portion at the distal end of the third boom 63, and pass through the front side of the arm 5 (see the arrow 5F shown in FIG. 1).
Side).

As described above, in the first boom 61 and the second boom 62, the pipes 71 and 72 supported on the side surfaces (right side surfaces) of the booms interfere with the third boom 63 with the nearest obstacles. The structure is supported by the upper surface 63U, which is free from irregularities, thereby realizing stable workability.

The pipes 72 extending on the front side of the arm 5 extend between the arm 5 and the bucket cylinder 24 and are connected to the cylinder of the bucket cylinder 24. With the above piping structure, hydraulic oil is supplied to the bucket cylinder 24, the arm cylinder 25, and the offset cylinder 26, and the working machine 2 can be operated left and right and up and down by expansion and contraction of the cylinder.

[0027]

The turning work vehicle according to the present invention has the following effects because it is constructed as described above. That is, in a turning work vehicle having a working machine including a first boom, a second boom, a third boom, an arm, and a bucket, piping for a cylinder that operates the working machine is connected to the first boom and the second boom. The configuration in which the work equipment is supported on the side surface improves workability without interfering with a rear obstacle even when the work machine rotates to the rear side of the cabin.

Further, since the pipe is configured to be supported on the side surface opposite to the position of the cabin of the first boom and the second boom, the boom (working machine) is moved as close to the center position of the swivel as possible. It became possible to configure, and the operability of the working machine was improved.

Further, the pipe is branched into a pipe for an offset cylinder and a pipe for an arm cylinder and a bucket cylinder at a front end of the side face of the first boom, and the pipe for the offset cylinder is routed to the opposite side. Change
Since it was configured to be connected to the offset cylinder on the opposite side of the second boom, the piping for the arm cylinder and the bucket cylinder with respect to the offset cylinder will be located on the opposite side of the second boom, and both will not interfere ,
A reasonable layout became possible.

Further, since the piping for the arm cylinder and the bucket cylinder is configured to be supported on the upper surface side of the third boom, the piping does not interfere with surrounding obstacles even by the swing operation of the third arm. , Stable work became possible.

Further, since the cover for covering the pipe is provided on the side surfaces of the first boom, the second boom, and the third boom,
It is possible to protect a plurality of pipes with a single cover without the need for a guide holder or the like, and it is possible to protect almost the entire side surface of the first boom and the second boom.

[Brief description of the drawings]

FIG. 1 is an overall side view of a turning work vehicle according to the present invention.

FIG. 2 is a left side view of the boom and the swivel base.

FIG. 3 is a rear view of the boom.

FIG. 4 is a right side view of the boom.

FIG. 5 is a top view of the third boom.

FIG. 6 is a left side view of a third boom and an arm.

FIG. 7A is a plan view of a first cover. (B) is a side view of the first cover. (C) is a front view (view from inside) of the first cover. (D) is a bottom view of the first cover.

FIG. 8A is a front view of a second cover. (B) is a top view and a bottom view of the second cover.

FIG. 9A is a front view of a third cover. (B) is a side view of the third cover.

FIG. 10 is a left side view of a conventional working machine.

[Explanation of symbols]

 4 Bucket 5 Arm 6 Boom 8 Swivel 24 Bracket Cylinder 25 Arm Cylinder 26 Offset Cylinder 61 First Boom 62 Second Boom 63 Third Boom 70 (For Offset Cylinder) Pipe 71 (For Arm Cylinder) Pipe 72 (For Bucket Cylinder) Piping 81 First cover 82 Second cover 83 Third cover

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hideki Seino, Inventor 1-32 Chayacho, Kita-ku, Osaka, Japan Inside Yanmar Diesel Co., Ltd. (72) Hiroyuki Otsuki 1-32 Chayacho, Kita-ku, Osaka, Osaka No. Yanmar Diesel Co., Ltd. F-term (reference) 2D012 EA02 2D015 BA01

Claims (5)

[Claims] A first boom, a second boom, a third boom,
A turning work vehicle having a working machine including an arm and a bucket, wherein a pipe for a cylinder for operating the working machine is configured to be supported on side surfaces of a first boom and a second boom. Car plumbing structure. 2. The piping structure for a turning work vehicle according to claim 1, wherein the piping is configured to be supported on a side surface of the first boom and the second boom opposite to the cabin arrangement position. 3. The pipe is branched into a pipe for an offset cylinder and a pipe for an arm cylinder and a bucket cylinder at a front end portion of the side face of the first boom, and the pipe for the offset cylinder is routed to the opposite side. The piping structure of a turning work vehicle according to claim 1 or 2, wherein the pipe is connected to the offset cylinder on the opposite side of the second boom. 4. The turning work vehicle according to claim 1, wherein the pipes for the arm cylinder and the bucket cylinder are configured to be supported on an upper surface side of a third boom. Piping structure. 5. The turning work vehicle according to claim 1, wherein a cover for covering the pipe is provided on a side surface of the first boom, the second boom, and the third boom. Piping structure.