JP2000064358A - Counterweight of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart continuity in the appearance of a counterweight and a revolving frame or the like to improve the attractive external appearance by forming a level difference face projecting to the underface of the counter weight from the lower face and arranging the underface of the counterweight and the underface of the revolving frame so as to be substantially flush with each other. SOLUTION: A counterweight 26 is laid at the end of a revolving frame 8 of a hydraulic excavator 2, a construction machine having an upper revolving body 6, and provided with a face 26a having a level difference at the underface. The underface of the counterweight 26 and the underface of the revolving frame 8 are arranged on the same plane S. The level difference of the face 26a is formed to coincide with the thickness T of a bottom plate 18 and the width of the face is formed to coincide with the width of the bottom plate 18 respectively. Further, the face 26a having a level difference is integrally formed with the counterweight 26 with cast iron. Accordingly, this structure imparts continuity to the external appearance of the counterweight and the revolving frame to improves the external appearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight for a construction machine, and more particularly to the shape and mounting of a counterweight for improving the appearance and appearance of a construction machine having an upper swing body.

[0002]

2. Description of the Related Art A construction machine having an upper revolving structure such as a hydraulic excavator or a crawler crane is equipped with a counterweight, which is a "balance weight" for effectively establishing a balance of the upper revolving structure on the revolving frame of the upper revolving structure. There is. This counterweight also defines part of the appearance of construction equipment.

Taking a hydraulic excavator as an example with reference to FIG. 6, a hydraulic excavator generally designated by numeral 2 is a lower traveling body 4 and extends substantially vertically on the lower traveling body 4 (FIG. 6).
(Extending in the up-and-down direction) in which the upper revolving structure 6 is mounted so as to be rotatable about a revolving axis 5. The upper revolving structure 6 is provided with a revolving frame 8 supported by the lower traveling structure 4 via a revolving bearing. On the revolving frame 8, a driver's cab 10 and a front of the driver's cab 10 (left in FIG. 6) are operated. An engine compartment 14 is provided behind the machine 12 and the operator's cab 10 (to the right in FIG. 6). The engine compartment 14 is provided with openable and closable doors 14a and 14b.

At the end of the revolving frame 8 (the right end in FIG. 6), the counterweight 1 is lined up in the engine compartment 14.
6 is attached. The counterweight 16 transports the hydraulic excavator 2 so that different weights can be attached according to the work load conditions of the hydraulic excavator 2 and the weight of the hydraulic excavator 2 increases as the machine body increases. It is removably attached to the swivel frame 8 so that it can sometimes be removed from the swivel frame 8 and transported separately from the airframe.

A bottom plate 18 is attached to the lower surface of the revolving frame 8. The bottom plate 18 is formed of a thick steel plate, and the equipment such as the engine and the hydraulic device housed in the engine compartment 14 may be damaged by contacting or being pushed up by obstacles such as earth and sand and rocks. Protects you from doing so.

The working machine 12 includes a boom 12a, which is swingably supported in a vertical direction on a swing frame 8, and a swing frame 8.
And a boom operating cylinder 12b interposed between the boom 12a and the boom 12a, an arm 12c supported at the tip of the boom 12a so as to be vertically swingable, and an arm operating cylinder 12d interposed between the boom 12a and the arm 12c. Arm 1
At the tip of 2c, there is provided a bucket 12e that is swingably supported in the vertical direction, and a bucket operating cylinder 12f that is interposed between the arm 12c and the bucket 12e.

[0007]

The counterweight attached to the upper revolving structure of the construction machine having the above-described upper revolving structure has the following problems to be solved.

That is, referring to FIG. 7 and FIG. 8 together with FIG. 6, there are several modes of attaching the counterweight 16 when the upper swing body 6 is viewed from the side. In FIG. 6, the lower surface of the revolving frame 8 (the upper surface of the bottom plate 18) and the lower surface of the counterweight 16 are aligned. FIG. 7 shows a form in which the lower surface of the counterweight 16 is projected downward from the lower surface of the bottom plate 18 which is the lower surface of the revolving frame 8. FIG. 8 shows a form in which the lower surface of the bottom plate 18 on the lower surface of the revolving frame 8 and the lower surface of the counterweight 16 coincide with each other.

All of the mounting forms of the counterweight 16 are the counterweight 16, the revolving frame 8,
In relation to the bottom plate 18, there is a lack of appearance in the lower part of the counterweight 16, and it is desired to improve the appearance in terms of appearance design, which is one of the commercial values.

The present invention has been made in view of the above facts, and its technical problem is to improve the shape and attachment of the counterweight to provide a counterweight, a swing frame, and a bottom plate attached to the swing frame. It is to provide a counterweight for a construction machine, which has a continuous appearance and improves the appearance.

[0011]

According to the present invention, as a counterweight for a construction machine that solves the above technical problems, a counterweight attached to a revolving frame of a construction machine having an upper revolving structure is used. A counterweight for a construction machine is provided, in which a step surface protruding from the lower surface is formed on the lower surface of, and the lower surface of the counterweight and the lower surface of the revolving frame are disposed on substantially the same surface. It

By disposing the lower surface of the counterweight having a stepped surface on the lower surface of the counterweight and the lower surface of the revolving frame on the same surface, the counterweight, the revolving frame, and the bottom plate are provided under the counterweight. The appearance of and can be made continuous, and the appearance is improved.

In a preferred embodiment, the step between the lower surface of the counterweight and the step surface is formed to have substantially the same thickness as the bottom plate attached to the lower surface of the revolving frame. Further, a portion of the step surface adjacent to the bottom plate is formed to have a width substantially the same as the width of the bottom plate. Further, the step surface is formed integrally with the counterweight by casting.

Then, the step of the step surface is matched with the thickness of the bottom plate, and the width thereof is adjusted with the width of the bottom plate, and the step surface is integrally formed with the counter weight by casting, whereby the counter weight, the swivel frame, The bottom plate has good continuity in appearance and is improved in appearance.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a counterweight for a construction machine constructed according to the present invention will be described in more detail below with reference to FIGS. Note that FIG.
In FIG. 5, parts that are substantially the same as those in FIG. 6 are given the same reference numerals, and detailed description thereof will be omitted.

Referring to FIGS. 1 and 2, a counterweight 26 of the present invention is attached to an end portion (right end in FIG. 1) of a swing frame 8 of a hydraulic excavator 2 which is a construction machine having an upper swing body 6. Has been done. The lower surface (surface S) of the counterweight 26 has a step surface 2 protruding from the lower surface.
6a is formed. Further, the lower surface of the counterweight 26 and the lower surface of the revolving frame 8 are arranged on substantially the same surface S.

The revolving frame 8 is integrally formed by welding mold steel materials and steel plates to each other, and has a trapezoidal shape having a thickness H when the hydraulic excavator 2 is viewed from the side. This swivel frame 8
A driver's cab 10 and an engine compartment 14 having openable and closable doors 14a, 14b are disposed behind the driver's cab 10 (rightward in FIG. 1). The counterweight 26 is attached to a mounting bracket (the mounting bracket will be described in detail later) formed at the end of the revolving frame 8.

A bottom plate 18 is attached to the lower surface of the revolving frame 8. The bottom plate 18 is formed of a thick steel plate having a thickness T, is appropriately divided into the revolving frame 8, and is fixed by welding or detachably attached by bolts.

Referring to FIGS. 3 to 5, the counterweight 26 is integrally formed of cast iron and has a substantially rectangular shape that is laterally long when viewed from the rear of the hydraulic excavator 2 (state of FIG. 3). When viewed from the side (state of FIG. 5), it is formed in a vertically long and vertically substantially rectangular shape, and when viewed from below (state of FIG. 4), it is formed in a half-moon shape in which an arc is projected rearward. The width of the counterweight 26 in the left-right direction (left-right direction in FIGS. 3 and 4) is formed to be substantially the same width W as the outer width of the revolving frame 8. On the lower surface of the counterweight 26, a step surface 26 a protruding from the lower surface is provided.
The thickness T is substantially the same as that of No. 8. The width of the portion of the step surface 26a adjacent to the bottom plate 18 (width in the left-right direction in FIGS. 3 and 4) is equal to that of the bottom plate 1.
The width WW is substantially equal to the width WW. Below the counterweight 26, a belt-shaped portion 26b is formed with a height H substantially the same as the thickness H of the revolving frame 8. Further, a pair of slits 26c, 26c having a V-shaped cross section are formed in the vertical middle portion of the counterweight 26 from the left and right side surfaces of the counterweight 26 to the arc-shaped rear surface, which are added in view design. (See FIG. 3). The slit 26c is continuous with the slits formed in the doors 14a and 14b of the engine compartment 14 (see FIG. 1). Further, a pair of mounting recesses 26d, 26d for mounting the counterweight 26 on the revolving frame 8 are formed on the bottom of the counterweight 26. Each of the mounting recesses 26d has a mounting surface 2 parallel to the bottom surface.
6e are formed, and each of the mounting surfaces 26e has a screw hole 26f.
Two are provided. The vertical position of the mounting surface 26e is determined so that the lower surface of the counterweight 26 and the lower surface of the revolving frame 8 are substantially the same surface S when the counterweight 26 is mounted on the revolving frame 8.

At the end of the revolving frame 8, a pair of mounting brackets 8 are pedestals that engage with a pair of mounting recesses 26d, 26d formed in the counterweight 26, respectively.
a and 8a are provided. When the counterweight 26 is attached to the revolving frame 8, the mounting surfaces 26e of the pair of mounting recesses 26d and 26d of the counterweight 26 are placed on the pair of mounting brackets 8a and 8a, respectively, and the bolt 28 is attached to the counterweight 26. Screw hole 2
The counterweight 26 is fixed to the mounting bracket 8a by screwing into the 6f via the spacer 27 and the mounting bracket 8a.

The operation of the counterweight of the construction machine as described above will be described with reference to FIGS.

(1) Counterweight 26 according to the present invention
Is provided with a step surface 26a having a step on the lower surface, and the lower surface of the counterweight 26 and the lower surface of the revolving frame 8 are arranged on the same surface S. T and the width is the width W of the bottom plate
Since the step surface is formed integrally with the counterweight by casting, the counterweight 26
The lower part of the counterweight 26, the revolving frame 8, and the bottom plate 18 can be made continuous in appearance, and the appearance can be improved. The sense of unity between the counterweight 26, the swing frame side 8 and the engine compartment 14 is increased.

(2) Further, the step weight 26a provided on the lower surface of the counterweight 26 can increase the weight of the counterweight 26 without increasing the size of the main body of the counterweight.

The present invention has been described in detail above based on the embodiments. However, the present invention is not limited to the above embodiments, and various changes or modifications can be made within the scope of the present invention. Is. For example, in the present embodiment, the counterweight 26 is integrally formed by casting, but the counterweight is formed by forming an outer shell of a steel plate into a container shape, and filling the inside with a filling material such as concrete. It can also be applied to weights.

[0025]

According to the counterweight for a construction machine constructed according to the present invention, a counterweight for a construction machine is provided in which the appearance of the counterweight and the revolving frame is made continuous and the appearance is improved.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator including a counterweight of a construction machine configured according to the present invention (a working device is not shown).

FIG. 2 is a rear view of the hydraulic excavator shown in FIG.

FIG. 3 is a rear view of the counterweight viewed in the direction of arrow AA in FIG.

FIG. 4 is a bottom view of a portion of the counterweight viewed in the direction of arrow BB in FIG.

5 is a cross-sectional view of a portion of the counterweight viewed in the direction of arrow CC in FIG.

FIG. 6 is a side view of the hydraulic excavator showing a conventional mounted state of the counterweight.

FIG. 7 is a partial side view of the hydraulic excavator showing another conventional mounting state of the counterweight.

FIG. 8 is a partial side view of the hydraulic excavator showing another conventional mounting state of the counterweight.

[Explanation of symbols]

2: Hydraulic excavator (construction machinery) 4: Undercarriage 6: Upper revolving structure 8: Revolving frame 14: Engine room 16: Counterweight 18: Bottom plate 26: Counterweight 26a: Step surface

Claims (4)

[Claims] 1. A counterweight attached to a revolving frame of a construction machine having an upper revolving structure, wherein a step surface protruding from the lower surface is formed on the lower surface of the counterweight, and the lower surface of the counterweight and the revolving frame are formed. The counterweight of the construction machine, wherein the lower surface of the counterweight is disposed substantially on the same surface. 2. The counterweight for a construction machine according to claim 1, wherein a step between the lower surface of the counterweight and the step surface is formed to have substantially the same thickness as a bottom plate attached to the lower surface of the revolving frame. 3. The counterweight for a construction machine according to claim 2, wherein a portion of the step surface adjacent to the bottom plate is formed to have a width substantially the same as the width of the bottom plate. 4. The counterweight for a construction machine according to claim 1, wherein the step surface is integrally formed with the counterweight by casting.