JP4033385B2 - Construction machine counterweight - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of counterweights for construction machines such as hydraulic excavators.
[0002]
[Prior art]
Generally, in a construction machine such as a hydraulic excavator, a front attachment is mounted on the front part of the upper swing body, while a counterweight for balancing the work load of the front attachment is provided on the rear part of the upper swing body. Is installed. And, when the counterweight is mounted on the upper swing body, conventionally, an integral counterweight set to a weight that bears all of the weight necessary for the counterweight is formed at the rear part of the frame of the upper swing body. It was fixed to the counterweight mounting seat using bolts.
[0003]
[Problems to be solved by the invention]
By the way, in a small model such as a small turning type hydraulic excavator, a space for arranging the counterweight is narrow, and therefore, a counterweight having a small size and a high specific gravity is used. Moreover, since the counterweight bears all of the weight necessary for the counterweight as described above, a considerably large load is applied to the bolt for attaching the counterweight to the mounting seat of the gantry frame. Thus, in order to avoid the breakage of the bolt that is subjected to the large load, it is necessary to fasten the bolt with a large size using a high torque, and there is a problem that the mounting weight of the counterweight is inferior. There was a problem to be solved. Furthermore, when the counterweight is attached to the gantry frame, the counterweight suspended on the crane or the like is lowered from above the gantry frame and placed on the mounting seat. The counterweight cannot be routed under the equipment and equipment, so it is necessary to secure the equipment equipment installation space and the counterweight installation space separately, which poses restrictions on the layout. There was also a problem to be solved that would interfere with downsizing the upper revolving structure.
[0004]
[Means for Solving the Problems]
The present invention has been created in view of the above-described circumstances to solve these problems, and is a counterweight disposed on a gantry frame . In the structure of the gantry weight part that is integrally fixed to the end part and forms a part of the gantry frame, and the main body weight part that is attached to the gantry weight part, the front and rear width of the gantry weight part is the front and rear of the main body weight part. The upper surface area of the gantry weight part is set larger than the width, and the upper surface area of the gantry weight part is set larger than the area where the main body weight part is placed, and the rear end position of the main body weight part is substantially the same as the rear end position of the gantry weight part. that matches with no away from the gantry weight portion upper surface has placed on the upper surface of the frame weight portion is fastened by bolts from the underside of the gantry weight part It is a counterweight for a construction machine and butterflies.
And by doing in this way, a part weight of a counterweight will bear a weight part of a counterweight, and the weight of a main part weight part will become light by that much, and the load concerning the bolt which attaches a main part weight part will be made small. Even if the bolt size and tightening torque are reduced, it is possible to avoid the problem that the bolt is damaged.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the upper excavator 3 is supported above the crawler type lower traveling body 2 so as to be rotatable.
[0006]
Reference numeral 4 denotes a pedestal frame (swivel frame) that serves as a pedestal for the upper revolving structure 3. A front attachment 8 including member devices such as a boom 5, an arm 6, and a bucket 7 is provided at the front center of the pedestal frame 4. While the base end portion is attached, the cab 9 is located on the left side of the base end portion of the front attachment 8, the tank chamber 10 such as a fuel tank or a hydraulic oil tank is located on the right side, and the engine and the engine surroundings are located on the rear side. An engine chamber 11 in which apparatus devices are accommodated is disposed, and a counterweight 12 described later is disposed on the rear side of the engine chamber 11.
[0007]
The counterweight 12 is used to balance the load moment acting on the upper swing body 3 and includes a gantry weight portion 13 and a main body weight portion 14 which will be described later.
The gantry weight portion 13 is formed of a casting in the present embodiment (it may be formed of other materials as long as it has a high specific weight), but is welded to the rear end portion of the gantry frame 4. It is fixed integrally and bears part of the weight of the counterweight 12 and forms part of the gantry frame 4.
The main body weight portion 14 bears the remaining weight of the counterweight 12 and is fixed to the gantry weight portion 13 by the bolt 15 while being placed on the upper surface 13a of the gantry weight portion 13. Yes.
[0008]
Here, the front-rear width H1 of the gantry weight part 13 is set wider than the front-rear width H2 of the main body weight part 14, and the rear end position of the main body weight part 14 is substantially the same as the rear end position of the gantry weight 13. It is attached to the gantry weight part 13 in a matching state. Thus, as is apparent from FIG. 1, it is placed in a state where it is not separated from the top surface of the gantry weight, that is, in a state where there is no gap with respect to the top surface of the gantry weight portion, and the upper space on the front side of the gantry weight portion 13 Can be used as an installation space for equipment such as an engine and a pump.
[0009]
Further, the gantry weight portion 13 is attached so that the upper surface 13 a thereof is positioned higher than the frame upper surface 4 a of the gantry frame 4. Thereby, machining of the gantry weight part upper surface 13a on which the main body weight part 14 is placed can be easily performed. Further, the height of the gantry weight part 13 is set to be substantially equal to the height of the fender part (skirt part) 16 attached to the side edge of the gantry frame 4. 1, the fender portion 16 and the gantry weight portion 13 are configured to be continuous in the horizontal direction.
[0010]
In the structure configured as described above, the upper swing body 3 of the excavator 1 is provided with a counterweight 12 to balance the load moment. The counterweight 12 is provided behind the gantry frame 4 of the upper swing body 3. A gantry weight part 13 that is integrally fixed to the end part to form a part of the gantry frame 4, and a body weight that is bolted to the gantry weight part 13 while being mounted on the upper surface of the gantry weight part 13 Part 14.
[0011]
As a result, the gantry weight portion 13 bears a part of the weight of the counterweight 12, and the weight of the main body weight portion 14 is reduced correspondingly, thereby reducing the load applied to the bolt 15 for attaching the main body weight portion 14. Even if the size of the bolt 15 and the tightening torque are reduced, it is possible to avoid a problem that the bolt 15 is damaged.
Further, when it is desired to remove the main body weight portion 14 for the maintenance of the equipment in the engine chamber 11 and the like, the main body weight 14 is lighter by the amount of the gantry weight 13 as described above. There is also an advantage of being.
[0012]
Further, the main body weight portion 14 is placed on the gantry weight portion upper surface 13a. In this case, the front-rear width H1 of the gantry weight portion 13 is set wider than the front-rear width H2 of the main body weight portion 14. Therefore, a part of the upper space of the gantry weight part 13 can be used as an arrangement space for equipment such as an engine and a pump. Thus, by setting the area of the gantry weight part upper surface 13a to be larger than the area where the main body weight part 14 is placed, the gantry weight part 13 which is a part of the counterweight 12 wraps around the lower part of the device. In this state, the degree of freedom of layout when arranging the equipment and piping on the upper swing body 3 is increased, and the upper swing body 3 can be made compact.
[0013]
Moreover, since the gantry weight part 13 is mounted so that the upper surface 13a thereof is positioned higher than the frame upper surface 4a of the gantry frame 4, the machining of the gantry weight part upper surface 13a on which the main body weight 14 is placed is machined. Can be easily performed, and can contribute to the improvement of productivity. Further, since the height dimension of the gantry weight part 13 is set to be substantially equal to the height dimension of the fender part 16 attached to the side edge of the gantry frame 4, the fender part 16, the gantry weight part 13, This is preferable in terms of design.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator.
FIG. 2 is a perspective view of main parts.
[Explanation of symbols]
4 Mounting frame 12 Counterweight 13 Mounting weight 14 Body weight 15 Bolt 16 Fender

Claims (1)

A counterweight disposed on a gantry frame, wherein the counterweight is fixed to a rear end portion of the gantry frame so as to form a part of the gantry frame, and is attached to the gantry weight portion. When configuring with the main body weight part, set the front and rear width of the gantry weight part wider than the front and rear width of the main body weight part, and set the upper surface area of the gantry weight part larger than the area where the main body weight part is placed The main body weight portion is placed on the upper surface of the gantry weight portion so that the rear end position thereof substantially coincides with the rear end position of the gantry weight portion and is not separated from the upper surface of the gantry weight portion. A construction machine counterweight characterized by being secured by bolts .

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