JP2576537Y2 - Arm structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an arm mounted on a front part of a hydraulic shovel.

[0002]

2. Description of the Related Art FIG. 7 is a plan view showing a state in which a side excavation attachment mounted on a hydraulic excavator is subjected to an offset operation. In the figure, 1 is a lower traveling structure, 2 is an upper revolving structure, 3 is a side excavation attachment attached to the front portion of the upper revolving structure 2, 4 is a rear boom of the side excavation attachment 3, 5 is a front boom, 6 Is the upper boom,
7 is an arm, 8 is a bucket, 9 is a boom cylinder, 10
Is an offset cylinder, 11 is an arm cylinder, 12 is a bucket cylinder, 13 is a rod, 0-0 is a center line in the front-rear direction of the rear boom 4, WL is a left offset from the center line 0-0, and WR is a right offset. It is. FIG.
FIG. 4 is a perspective view of a main part showing a hydraulic piping group A disposed on the side digging attachment 3. The hydraulic piping group A is controlled by various hydraulic actuators (bucket cylinders 1) from a control valve (not shown) mounted on the upper swing body 2.
2, the arm cylinder 11, the offset cylinder 10, etc.).

[0003]

In the prior art side excavation attachment, hydraulic piping from a control valve mounted on the upper swing body to various hydraulic actuators (bucket cylinder, arm cylinder, offset cylinder, etc.) is provided. It is arranged in an exposed state. For this reason, the hydraulic piping may be damaged by colliding with or catching on an external obstacle. In addition, since the hydraulic piping was exposed in a messed-up manner, the appearance of the side digging attachments was poor. The present invention
It is an object of the present invention to provide a structure of an arm which is a part of a means for solving the above problems.

[0004]

In the arm of the present invention, a boom is attached to a front portion of a vehicle body, and an arm, a bucket, and the like are connected to a front end portion of the boom so as to be rotatable in the front-rear direction. A pair of left and right vertical plates erected from the rear upper surface to the rear end surface,
A bracket having a box-shaped cross section formed by the pair of left and right vertical plate portions and the top plate portion formed integrally with each other and having a required strength is set, and the bracket drives the arm and the bucket. Along with pivotally supporting one end of each of the arm cylinder and the bucket cylinder so as to be rotatable in the front-rear direction, the strength of the bracket is set to a strength that can withstand a reaction force generated when the arm cylinder and the bucket cylinder are driven. A hydraulic pipe is inserted into the box-shaped cross section opened in the front-rear direction and constituted by the pair of left and right vertical plates, the top plate and the upper surface of the arm.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a main part of a side digging attachment 15 having an arm 14 according to the present invention. In the figure, 16 is a rear boom of the side digging attachment 15, 17L is a link, 17R is a front boom, 18 is an upper boom, 19 is a bucket, 20 is a boom cylinder, 21 is an offset cylinder, 22 is an arm cylinder, 23 is a bucket cylinder, 24 is a bracket at the rear of the arm (14), 25 is an arm cylinder mounting pin pivotally attached to the bracket 24, 26 is a bucket cylinder mounting pin, and 27 is a control valve (not shown) mounted on a hydraulic shovel to the bucket cylinder 23. It is a hydraulic piping that leads to. FIG. 2 shows the side excavation attachment 15 in FIG.
It is a principal part top view which shows the state which carried out offset operation (offset amount is WR) rightward from 0 '. FIG.
It is principal part sectional drawing seen from -A arrow. In the figure, 28L, 28
R denotes a pair of left and right vertical plates of the bracket 24, 29L, 2
9R is a top plate portion formed by bending the upper portions of the vertical plate portions 28L and 28R inward, and 30 is a top plate portion 29L and 29R.
R butt weld.

Next, the structure of the arm 14 of the present invention is shown in FIGS.
Referring to FIG. In the arm 14 of the present invention, the hydraulic piping 27 leading to the bucket cylinder 23 is connected to the arm (14).
The vertical plate portion (28L, 28L) of the rear bracket 24
R), the top plate (29L, 29R) and the arm (1
In order to pass through the inside of the box-shaped cross section formed by the upper surface of 4), a pair of left and right vertical plate portions 28L,
The shape of 28R is formed large so as to be able to hold the piping space (the space indicated by the symbol S in FIGS. 1 and 3), and the top plate 29L, which is bent over the vertical plates 28L and 28R, respectively. 29R and were connected by butt welding.

Next, the operation of the arm 14 of the present invention will be described. Since the vertical plate portions 28L and 28R of the bracket 24 are made large to secure the piping space S, the hydraulic piping 27 leading to the bucket cylinder 23 passes through the piping space S inside the upper boom 18 and inside the bracket 24, Connected to bucket cylinder 23. Therefore, the hydraulic pipe 27 does not collide with or be caught by an external obstacle, and the appearance is simple and the appearance is improved. Further, the vertical plates 28L and 28R of the bracket 24 are connected to the top plate (29L,
29R), the vertical plate portions 28L,
The strength of 28R increases. Therefore, the vertical plate portion (28
L, 28R) can be set to the minimum thickness, so that the weight of the bracket (24) can be reduced. That is, by making the bracket (24) have a box-shaped cross section, the thickness of each plate constituting the bracket (24) can be made thin and light, and the required strength can be obtained.

Next, FIG. 4 is a sectional view showing a main part of an arm 14a according to another first embodiment of the present invention. In the arm 14a, the left and right upright plate portions 31L and 31R and the upper top plate portion 32
Is formed by a single plate. That is, the single plate was bent into a U-shaped cross section as shown in FIG. 4 to form the bracket 24a. The function and function of the arm 14a having the bracket 24a are the same as those of the arm 14 shown in FIGS.

FIG. 5 is a sectional view of a main part of an arm 14b according to another embodiment of the present invention. In the arm 14b, a top plate 34 is welded inside the upper portions of the left and right vertical plates 33L and 33R. This bracket 24b
The function and function of the arm 14b provided with
This is the same as the case of the arm 14 shown in FIG. FIG. 6 is a sectional view showing a main part of an arm 14c according to a third embodiment of the present invention. Like the bracket 24c of the arm 14c, the top plate 35 may be welded over the upper edges of the left and right vertical plates 33'L and 33'R.

[0010]

[Effect of the Invention] In the arm of the side digging attachment of the present invention, piping space is secured inside the box-shaped cross section of the bracket, so the hydraulic piping leading to the bucket cylinder is located inside the bracket from the inside of the upper boom. Through to a bucket cylinder. Therefore, the hydraulic pipe does not collide with or be caught by an external obstacle, and the appearance is simple and the appearance is improved. Also, the bracket at the rear of the arm has a box-shaped cross-section by integrally forming a pair of uprights and a top plate, so that the required thickness is kept to a minimum while securing the required strength. By setting the limit thickness, the weight of the bracket can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a side digging attachment having an arm of the present invention.

FIG. 2 is a main part plan view showing a state where an offset operation has been performed on a side digging attachment in FIG. 1;

FIG. 3 is a cross-sectional view of a main part taken along the line AA of FIG.

FIG. 4 is a cross-sectional view illustrating a main part of another first embodiment of the present invention;

FIG. 5 is a cross-sectional view illustrating a main part of another second embodiment of the present invention;

FIG. 6 is a sectional view showing a main part of an arm according to a third embodiment of the present invention;

FIG. 7 is a plan view showing a state where an offset operation has been performed on a side digging attachment of the related art.

8 is a perspective view of a main part of the side digging attachment in FIG. 7;

[Explanation of symbols]

3,15 Side digging attachment 4,16 Rear boom 5,17R Front boom 6,18 Upper boom 7,14,14a, 14b, 14c Arm 8,19 Bucket 12,23 Bucket cylinder 24,24a, 24b, 24c Bracket 27 Hydraulic piping 28L, 28R, 31L, 31R, 33L, 33R, 3
3'L, 33'R Vertical plate 29L, 29R, 32, 34, 35 Plate member S Piping space

Claims (1)

(57) [Scope of request for utility model registration] 1. A mounting boom to the front portion of the vehicle body, the arm on the boom tip, in attachments pivotally connected to the front-rear direction bucket or the like, respectively, the
The left and right sides of the arm are erected from the rear upper surface to the rear end surface.
The pair of vertical plates and the pair of left and right vertical plates are integrally formed.
The required strength is formed by forming a box-shaped cross section with the top plate
Having a bracket set therein, wherein the bracket is
Arm cylinder and bar for driving the arm and bucket
One end of each of the cylinders is rotatable in the front-rear direction
While pivoting, the strength of the bracket is
Countermeasures generated when driving the cylinders and bucket cylinders.
The strength is set to withstand the force, and furthermore, the left and right pair
A top plate, the top plate, and an upper surface of the arm.
Hydraulic piping in the box-shaped cross section opened in the front-rear direction
An arm structure characterized by being inserted .