JPH08199617A - Hydraulic shovel - Google Patents

Abstract

PURPOSE: To work even in a narrower working area without any trouble by setting the turning circles of an upper turning body and an working attachment in a rising condition within the wheel width of a lower travelling body. CONSTITUTION: In such a state that the longitudinal center line 0'-0' of an upper turning body 17 is in parallel to the longitudinal center line Q-Q of a boom 8', the center line Q-Q of the boom is offset a distance from the longitudinal center line P-P of the vertical axis of a front bracket 18 to the longitudinal center line 0'-0' of the upper turning body 17. The swing circles S', A of the upper turning body 17 and a working attachment 14' in a rising condition are set within the wheel width of a lower travelling body 16 in a plane view. In this way, even when a hydraulic shovel 15 goes into a narrower working area at the very limit of the wheel width, the working attachment 14' can swing and work in a rising condition.

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 upper full swing type hydraulic excavator in which a boom of a work attachment can be swung left and right.

[0002]

2. Description of the Related Art FIG. 6 is a plan view of a hydraulic excavator 1 described in JP-A-62-148725. In the hydraulic excavator 1 shown in FIG. 6, an upper revolving structure 3 is provided on the upper part of a lower traveling structure 2 so as to be fully revolvable, and a front bracket 4 is attached to the front part of the upper revolving structure 3 and the center of the upper revolving structure 3 in the front-rear direction. The boom base end bracket 5 is connected to the front bracket 4 via the vertical axis 6 so as to be swingable right and left by the swing cylinder 7 so as to be offset to the right of the line 0-0. A boom 8, an arm 9, and a bucket 10 which is a work tool are sequentially connected to the boom base end bracket 5, and the boom cylinder 11 and the arm cylinder 1 are respectively connected.
2. A work attachment 14 which is vertically rotatable by a bucket cylinder 13 is attached. Then Fig. 6
The boom base end bracket 5 is swung to the left at a substantially right angle by operating the swing cylinder 7 as shown in FIG.
Up to the maximum, the arm 9 is retracted and bent to the maximum, and when the bucket 10 is further rotated to a substantially horizontal posture, a trajectory is obtained with a required radius R around the swing center X of the upper swing body 3. It is configured such that the upper revolving superstructure 3 in plan view and the work attachment 14 in the above posture are included in a certain revolving circle S.

[0003]

In the hydraulic excavator 1 according to the embodiment of the prior art shown in FIG. 6, the diameter dimension 2R of the turning circle S is 2R.
However, it is considerably larger than the vehicle width dimension W between the left and right outer end surfaces of the lower traveling body 2. Therefore, when the hydraulic excavator 1 enters a narrow work site where the vehicle width W is very small, the upper revolving structure 3 and the work attachment 14 in the upright state cannot be swung, so that the work cannot be performed and the condition is bad. It is an object of the present invention to provide a hydraulic excavator that can solve the above problems.

[0004]

According to the present invention, an upper revolving structure is provided above a lower traveling structure, and a front bracket is provided at a front portion of the upper revolving structure on either side of a longitudinal center line of the upper revolving structure. Offset it to one side and project it, and connect the boom base end bracket to the front bracket so that it can swing to the left and right with the vertical axis, and the work attachment in which the boom, arm, and work tool are sequentially connected to the boom base end bracket. Mounted so that it can be rotated up and down, swing the boom base end bracket approximately at right angles in the required left and right directions, raise the boom to the maximum, retract and bend the arm to the maximum, and rotate the work tool in the required posture. The hydraulic excavator configured to include the upper revolving structure and the work attachment in the upright state within the trajectories with a required radius centered on the revolving center of the upper revolving structure. The front-rear centerline of the boom base end bracket of the boom base-end bracket when the front-rear centerline of the upper revolving structure and the boom front-rear centerline are parallel to each other. An offset is set to the front-rear centerline of the upper revolving structure by a required dimension with respect to the front-rear centerline. The turning circle, which is a locus traced around the turning center, is set to be within the vehicle width between the left and right outer end surfaces of the lower traveling body.

[0005]

In the hydraulic excavator according to the present invention, the front-rear centerline of the boom base-end mounting portion of the boom base-end bracket when the front-rear centerline of the upper swing body and the front-rear centerline of the boom are parallel to each other The boom base end bracket is swung up at a substantially right angle by operating the swing cylinder because the offset is set to the front-rear centerline of the upper revolving structure by the required dimension with respect to the front-rear centerline of the vertical axis of the front bracket. When the body is rocked toward the centerline side in the front-rear direction, the centerline of the work attachment is located closer to the center of rotation than the center of the vertical axis by an offset amount of a required dimension. That is, the work attachment in the upright state can be positioned close to the center of the upper swing body. Therefore, the turning circle in the present invention can be set within the vehicle width.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of essential parts of a hydraulic excavator 15 of the present invention. In the figure, 16 is a lower traveling body of the hydraulic excavator 15, 17 is an upper revolving body provided on the upper portion of the lower traveling body 16 so as to be fully revolving, and 18 is a front bracket projecting to the front right side of the upper revolving body 17. , 19 is a boom base end bracket connected to the front bracket 18 by a vertical axis 20, 21 is a swing cylinder, 22 is a drive link, 2
3 is a push link, and 14 'is a boom base end bracket 1
9 is a work attachment mounted on the work attachment, 8'is a boom of the work attachment 14 ', 9'is an arm, 10' is a bucket as a work tool, 12 'is an arm cylinder, 13' is a bucket cylinder, and S'is an upper swing body 17 A turning circle which is a locus traced with a radius R'centered on the turning center X'of
The center line 0'-0 'is the center line in the front-rear direction of the upper swing body 17,
The center line P-P is the center line in the front-rear direction of the vertical axis 20, the center line Q-
Q is the center line of the work attachment 14 'in plan view.
FIG. 2 is an enlarged view of part A of FIG. In the figure, 24 is a boom base end mounting portion of the boom base end bracket 19, 25 is a boom base end pin, 26 is a vertical axis for a drive link provided on the rear side and the lower side of the vertical axis 20, and the dimension 1 is a vertical direction. Work attachment 1 with respect to the longitudinal centerline P-P of the shaft 20
It is the offset amount (same as the eccentric amount) of the center line 4 '(which is also the center line of the boom 8'). The center line of the boom base end mounting portion coincides with the center line Q-Q of the boom 8 '. FIG. 3 is a partially cutaway side view showing the vicinity of the boom base end bracket 19 in FIG. In the figure, 1
Reference numeral 1'denotes a boom cylinder for driving the boom 8 '.

In FIG. 4, the boom base end bracket 19 shown in FIG. 1 is swung to the left at a substantially right angle by operating the swing cylinder 21, and the boom 8'is maximally erected and the arm 9'is maximally retracted and bent. Then, the so-called work attachment 1 in which the bucket 10 ′ is further rotated to a substantially horizontal posture
It is a top view which shows the standing state of 4 '. FIG. 5 shows B of FIG.
FIG. In the figure, a center line P′-P ′ is a horizontal center line of the vertical axis 20 that intersects the axial center P _O of the vertical axis 20 and intersects the longitudinal center line P-P of the vertical axis 20, and dimension 1 is shown in FIG. Center line Q-Q of the work attachment 14 'in
Is the amount of offset with respect to the center line P′-P ′ of.

Next, the construction of the hydraulic excavator 15 of the present invention will be described with reference to FIGS. In the present invention, the upper swing body 1
Boom base end bracket 1 when the front-rear center line 0′-0 ′ of 7 and the center line Q-Q of the boom 8 ′ are in a parallel state
The boom center end mounting portion 24 (shown in FIG. 2) 9 of the front-back direction center line (corresponding to the center line Q-Q of the boom 8 ′) of the boom bracket 8 is attached to the front-back direction center line P- of the vertical axis 20 of the front bracket 18. An offset setting of a required dimension l with respect to P was made near the center line (0′-0 ′) in the front-rear direction of the upper swing body 15. A turning circle S ′, which is a locus traced with a radius R ′ around the turning center X ′ of the upper revolving superstructure 15, is a vehicle width between the left and right outer end surfaces of the lower traveling body 16 (vehicle width as shown in FIG. 4). The dimension is set to W ').

Next, the operation of the hydraulic excavator 15 of the present invention will be described. In the hydraulic excavator 15 of the present invention, the boom base end mounting portion of the boom base end bracket 19 when the longitudinal centerline 0′-0 ′ of the upper swing body 17 and the centerline QQ of the boom 8 ′ are in a parallel state. 24 (shown in FIG. 2) front-rear centerline (matches centerline Q-Q of boom 8 ')
Is the longitudinal centerline P of the longitudinal axis 20 of the front bracket 18.
The boom base end bracket 19 is set to the swing cylinder 2 because the offset 1 is set to a position closer to the center line (0′-0 ′) in the front-rear direction of the upper swing body 15 with respect to −P.
When swinging toward the front-rear direction center line (0′-0 ′) side of the upper swing body 17 at substantially right angles by one operation, the center line Q-Q of the work attachment 14 ′ is the center of the vertical axis 20 (see FIG. 5). The position becomes closer to the turning center X ′ by an offset amount of a required dimension 1 from the indicated axis P _O ). That is, the work attachment 14 ′ in the upright state can be positioned close to the center of the upper swing body 17. Therefore, the turning circle S'in the present invention is defined by the vehicle width (vehicle width dimension W'shown in FIG. 4).
Can be set within. In this embodiment, as shown in FIG. 1, the front bracket 18 and the swing cylinder 21 of the upper swing body 17 are arranged on the right side of the longitudinal center line 0′-0 ′ of the upper swing body 17. Not limited to this, the front bracket and the swing cylinder may be arranged on the left side.

[0010]

In the hydraulic excavator of the present invention, the longitudinal centerline of the boom proximal end mounting portion of the boom proximal bracket when the longitudinal centerline of the upper swing body and the longitudinal centerline of the boom are parallel to each other is set. Since the offset is set to the front-rear centerline of the upper swing body by a required dimension with respect to the front-rear centerline of the vertical axis of the front bracket, the boom base-end bracket is moved substantially at a right angle by the swing cylinder operation. When the upper revolving structure is swung toward the centerline side in the front-rear direction, the centerline of the work attachment comes closer to the revolving center by an offset amount of a required dimension from the center of the vertical axis. That is, the work attachment in the upright state can be positioned close to the center of the upper swing body. Therefore, since the turning circle in the present invention can be set within the vehicle width, even when the hydraulic excavator enters a narrow work site where the vehicle width dimension is narrow, the work attachment can be turned in the standing state to handle the work. You can

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a hydraulic excavator according to the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a side view of a partly cutaway main portion showing the vicinity of a boom base end bracket in FIG.

FIG. 4 is a plan view in which the boom base end bracket in FIG. 1 is swung to the left at a substantially right angle and the work attachment is in an upright state.

5 is an enlarged view of part B in FIG.

FIG. 6 is a plan view of a hydraulic excavator according to an embodiment of the prior art.

[Explanation of symbols]

 1,15 Hydraulic excavator 2,16 Lower traveling structure 3,17 Upper revolving structure 4,18 Front bracket 5,19 Boom base end bracket 6,20 Vertical axis 7,21 Swing cylinder 8,8 'Boom 9,9' Arm 10,10 'Bucket 14,14' Work attachment 24 Boom base end mounting part

Claims (2)

[Claims] 1. An upper revolving structure is provided above the lower traveling structure,
The front bracket is offset to the left or right of the front-rear center line of the upper revolving structure so that it protrudes at the front of the upper revolving structure, and the boom base end bracket swings to the left or right on the front bracket. In a hydraulic excavator that is vertically rotatably mounted with a work attachment in which the boom, the arm and the work tool are sequentially connected to the boom base end bracket, the center line of the upper revolving structure in the front and rear direction of the boom Center the front-rear direction of the boom base-end mounting part of the boom base-end bracket in the parallel state with the centerline by the required dimension with respect to the front-rear centerline of the longitudinal axis of the front-rear bracket. A hydraulic excavator characterized by an offset setting near the line. 2. The hydraulic excavator according to claim 1, wherein a turning circle, which is a locus traced around the turning center, is included within the vehicle width between the left and right outer end surfaces of the lower traveling body. A hydraulic excavator characterized by being set.