JP3510081B2 - Hydraulic working machine - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hydraulic working machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art A hydraulic working machine such as a hydraulic excavator is provided with a swing frame which is provided on a traveling body so as to be freely rotatable. A cab on which an operator rides is provided in a part of the revolving frame, and a counterweight is attached to a rear portion of the revolving frame. In addition, the swing frame includes various devices such as a hydraulic motor and a main device such as an internal combustion engine as a drive source thereof, various hydraulic cylinders, a tank containing hydraulic oil, a fuel tank containing fuel for the internal combustion engine, and the like. Is installed.

By the way, there are various types of equipment mounted on the revolving frame in various shapes and sizes, and various revolving frames are also employed depending on the mounting space of the various equipment.

For example, there are a plurality of types of cabs, such as a small cab in which a driver's living space is relatively narrow and a relatively large cab forming a wide living space. Further, the counterweight is provided on the rear peripheral portion of the revolving frame, but the mounting position of the counterweight (distance from the rotating shaft of the revolving frame) may be changed depending on the use application and configuration. In such a case, it is necessary to separately design and manufacture revolving frames having different shapes depending on the size of the cab or the mounting position of the counterweight, which is disadvantageous in that the cost increases.

In addition, this type of hydraulic working machine is provided with a small turning frame whose turning locus is substantially contained within a circle having a vehicle width as a diameter when the working site where the hydraulic working machine is used is relatively narrow. If the work site is relatively large and a large-sized main device is required, the swivel frame also becomes large. As described above, the swivel frame provided in the hydraulic working machine has a different size adapted to the intended use, and this also necessitates designing and manufacturing plural types of swivel frames each having a different shape, which increases the cost. There is inconvenience.

Furthermore, this type of hydraulic excavator is a model of the same class (the main equipment such as an internal combustion engine and a tank is the same).
However, there are those having a plurality of vehicle body shapes. That is, although the main equipment such as an internal combustion engine and a tank are the same, a turning frame whose turning locus is substantially contained within a circle having a vehicle width as a diameter, and a counterweight having a relatively small weight are used. In order to reduce the weight, there is a counterweight provided so as to extend to the rear of the vehicle body at a relatively long distance from the rotation axis of the revolving frame. Even though these models are of the same class, the size of the cab and the position of the counterweight are different, so that it is necessary to manufacture their own revolving frames. Furthermore, it is necessary to separately manufacture bonnets corresponding to the revolving frames having different shapes, which disadvantageously increases the manufacturing cost of each hydraulic excavator.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above inconvenience, and the present invention is of the same class even if the mounting space of various devices on the swing frame or the usage of the hydraulic working machine is different. An object of the present invention is to provide a hydraulic working machine capable of reducing the cost by sharing the basic part of the swing frame even if the size of the cab and the position of the counterweight differ in the model.

[0008]

To achieve SUMMARY OF THE INVENTION The above objects, the present invention includes a traveling body, in hydraulic working machine provided with a rotating frame which pivotally disposed et on said traveling body,
The revolving frame includes a basic frame formed in a shape capable of revolving within a vehicle width of the traveling body, and an expansion frame for expanding the basic frame, and the expansion frame is a cab mounted on the revolving frame, The counterweight is configured to be attached to the basic frame as necessary in accordance with the arrangement of the internal combustion engine, various devices including hydraulic equipment, and the counterweight on the swivel frame, and the counterweight is substantially within the swirl locus of the basic frame. A small turning counterweight formed so as to fit therein, or an extension type counterweight formed so as to extend outward from a turning locus of the basic frame at least during turning, wherein the small turning counterweight and the small turning counterweight are provided. The extension type counterweight is characterized by being selectively attached.

According to the present invention, when the cab mounted on the revolving frame, the internal combustion engine, the various devices including the hydraulic equipment, and the counterweight are contained in the basic frame, the revolving frame is composed of only the basic frame. If any of the cab, internal combustion engine, various equipment including hydraulic equipment, and counterweight mounted on the swivel frame does not fit into the basic frame, attach an expansion frame to the basic frame to swivel the space for a wide mounting space. Make up the frame. As described above, by mounting the expansion frame on the basic frame as necessary, it is possible to form a necessary mounting space with the basic frame being common, and to reduce the manufacturing cost.

The basic frame is the cab,
As a minimum size for accommodating various devices including an internal combustion engine and a hydraulic device, it may be formed into a shape capable of turning within the substantially vehicle width of the traveling body. Note that the basic frame may have a portion that protrudes slightly outward from the vehicle width of the traveling body due to the influence of the arrangement of the main equipment such as the internal combustion engine and various tanks to be mounted, Also in this case, it may be formed so as to substantially turn within the vehicle width of the traveling body.

Further, when the basic frame has a shape capable of turning within the vehicle width, an extension frame is provided when the small turning counterweight having a shape capable of turning within the substantially vehicle width of the traveling body is mounted. If a small turning counterweight is mounted on the basic frame without using the extension counterweight that extends outward from the turning trajectory of the basic frame at least during turning, an extension frame is provided on the basic frame to extend the counterweight. A built-in counterweight may be formed.

[0012]

[0013]

In this case, a plurality of types of the expansion frames are formed in different shapes corresponding to the mounting positions on the basic frame, and each expansion frame is selectively mounted on the basic frame separately. Thus, the expansion frame can be attached only to a place required for the intended use, and the swivel frame can be formed into a desired shape without newly designing or manufacturing, so that the cost increase can be prevented. .

Further, in the present invention, the extension type counterweight is constituted by an extension frame composed of a weight support member attached to the basic frame and a weight member attached to the extension frame, and extended to the basic frame. A weight support member that is a frame may be provided, and the weight member may be provided on the weight support member. An undercover is provided when the extension type counterweight is attached to the basic frame to cover the gap between the basic frame and the weight member. Further, in the extension type counterweight, the extension frame composed of the frame extension member attached to the basic frame and the weight member are integrally configured, so that the basic frame and the weight member are provided without providing the undercover. The extended type counterweight can be provided in a state of covering the gap between and. Further, by making the weight of the extended type counterweight smaller than the weight of the small turning counterweight, it is possible to reduce the weight of the vehicle body by making the shape of the turning frame common.

With the above construction, when the rear end side of the turning frame can be turned within the vehicle width, it is sufficient to mount the small turning counterweight without attaching the extension frame to the basic frame. When the counter weight is not provided on the rear end side so as to be able to turn within the vehicle width and the counter weight is provided further rearward, it is possible only to provide the extension frame. As a result, the basic frame can have a common shape, and the increase in manufacturing cost can be reduced.

Further, in the present invention, when the rear end shape of the small turning counterweight is a substantially circular arc shape having the turning axis of the basic frame to which the small turning counterweight is attached as a center. The rear end shape of the extended type counterweight is preferably a substantially circular arc shape having substantially the same radius as the small turning counterweight, and more preferably, the rear end portion of the extended type counterweight is It has the same shape as the rear end of the small turning counterweight. This makes it possible to make the rear end side shape of the turning frame common regardless of whether the small turning counterweight or the extended counterweight is mounted.

When the small turning counterweight is provided at the rear end portion of the basic frame, a rear bonnet covering the rear portion of the basic frame and a front bonnet covering the front portion of the basic frame are provided. When the extension type counterweight provided with the extension frame is provided behind the basic frame, the extension frame is covered with the rear bonnet and the rear side of the basic frame between the rear bonnet and the front bonnet is provided. An intermediate hood that covers the

Thus, even when the extended counterweight is provided instead of the small turning counterweight, the intermediate bonnet can cover the gap between the rear bonnet and the front bonnet. , In addition,
Since the shape of the rear bonnet can be made common,
The increase in manufacturing cost can be reduced.

[0020] In the present invention, in the basic frame, that before applying preparative extending設用Dekkikaba over corresponding to Kinobe設型counterweight preferred. By attaching the extension deck cover, the gap formed when the extension type counterweight is attached to the basic frame can be filled.

[0021]

It will be described with reference to the implementation form of the embodiment of the present invention in the drawings. Figure 1 shows no expansion frame attached
One aspect view of a conventional hydraulic working machine have the form, FIG 2 is extended
Plan view illustrating the basic frame form a frame is not attached schematically, FIG. 3 (a) is a plan view schematically showing a partially exploded of usage scenario that due to the basic frame of FIG. 2 shows,
3 (b) is a plan view after assembly of FIG. 3 (a), and FIG. 4 is shown in FIG.
Shows a hydraulic working machine explanatory plan view of the FIG. 5 first of the present invention
One side view of the hydraulic working machine of the embodiment , FIG. 6 (a) is a plan view schematically showing a part of the first configuration example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. 6 (b) is a diagram. 6 (a) is a plan view after assembly, FIG. 7 is an explanatory plan view of the hydraulic working machine shown in FIG. 5, and FIG. 8 (a) is a partial exploded view of the second configuration example by the basic frame shown in FIG. FIG. 8B is a plan view schematically showing
FIG. 9 (a) is a plan view after assembly, and FIG. 9 is a second embodiment of the present invention .
10A is a side view of a hydraulic working machine in a state of FIG. 10, FIG. 10A is a plan view schematically showing a part of a third configuration example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. FIG. 11A is a plan view after assembly, FIG. 11 is an explanatory plan view of the hydraulic working machine shown in FIG. 9,
FIG. 12 is an explanatory plan view of a hydraulic working machine according to a third embodiment of the present invention .

A hydraulic working machine 1 shown in FIG . 1 is a small hydraulic excavator configured to work in a narrow space , and includes a traveling body 2a and a revolving body 2b rotatably provided on the traveling body 2a. It is composed of and. The revolving structure 2b is configured based on a revolving frame 3 that forms a floor portion, and a boom 4, an arm 5, and a bucket 6 are extended to the front of the revolving frame 3. In addition, a cab 7 that forms a living space for the driver is provided on the revolving frame 3.
It has a counterweight 8.

The turning frame 3 is formed by a basic frame 9 as shown in FIG. 3 (b). As shown in FIG. 2, the basic frame 9 includes the traveling body 2 in a plan view.
The shape is such that it fits within a circle whose diameter is the width of the vehicle formed by the lateral width of a, and even if the vehicle turns, the portion protruding from the width of the traveling body 2a is formed as few as possible.
In particular, the shape of the rear end edge of the basic frame 9 is formed in an arc shape along the turning trajectory. The basic frame 9 includes a battery 10, a hydraulic oil tank 11, and an operation valve 1.
2. Various devices such as a turning motor 13, a pump 14, an engine 15, a radiator 16, and a fuel tank 17 are mounted, and a cab mounting portion 18 for mounting the cab 7 is provided. Further, behind the front edge of the basic frame 9, there is a boom bracket 19 for pivotally mounting the base of the boom 4.
Is provided.

As shown in FIG. 3 (a), the basic frame 9 has deck covers 20 and 21 attached along the left and right side edges thereof, and a floor plate 22 attached to the cab mounting portion 18 so that the turning frame 3 can be rotated. Make up. Further, the counterweight 8 is fixed to the rear edge so as to be as shown in FIG. 3 (b) .

On the floor plate 22 of the cab mounting portion 18, as shown in FIG. 4, the relatively small cab 7 for small turning which fits substantially within a circle having a vehicle width as a diameter is attached. Further, as shown in FIG. 2, since the various devices are mounted on the basic frame 9, as shown in FIG. 4, a first bonnet 23 and a second bonnet 24 for accommodating them are provided. First bonnet 23
Covers the battery 10, the hydraulic oil tank 11, the operation valve 12 and the like mounted on the basic frame 9 on the side opposite to the cab 7, and the second bonnet 24 is mounted on the rear side of the basic frame 9. The pump 14, the engine 15, the radiator 16, etc. are covered. Second bonnet 24
As shown in FIG. 4, has a substantially semicircular shape in plan view, and its rear end side is formed in a shape corresponding to the arc shape of the counterweight 8. Further, the turning motor 13, the fuel tank 17 and the like are covered by guard members 25 and 26, respectively. In this way, the hydraulic working machine 1 capable of making a small turn according to the purpose of working in a narrow space as shown in FIG. 1 is formed.

Next, the hydraulic working machine 27 shown in FIG. 5 will be described. The hydraulic working machine 27 has a cab 28 whose shape is shown in FIG. 1 in order to widen a driver's living space.
Greater than. Further, the counterweight 29 of the hydraulic working machine 27 has the same shape as that mounted on the hydraulic working machine 1 shown in FIG. 1, but is mounted so as to be located behind the hydraulic working machine 1 shown in FIG. The counterweight 29 is lighter than the counterweight 8 attached to the hydraulic working machine 1 shown in FIG.

The hydraulic working machine 27 shown in FIG. 5 is formed by using the basic frame 9 shown in FIG. 2 similarly to the hydraulic working machine 1 shown in FIG. That is, as shown in FIGS. 6 (a) and 6 (b), the basic frame 9 is provided along the left and right side edges.
De Kkikaba 20 and 30 provided Te, further, the cab mounting portion 18, extended floor plate 31 is a form of extended frames to extend the basic frame 9 is attached. Further, the extension floor plate 31 is connected to the cab mounting portion 18 by a cab support frame 18a that supports the extending portion from below. A bracket 32, which is another form of an expansion frame, is provided behind the basic frame 9, and the counterweight 29 is fixed via the bracket 32. Further, under the bracket 32, under guards 33, 34 and 35 which are one aspect of the under cover of the present invention are provided. A space is formed between the deck covers 20, 30 and both ends of the counterweight 29 by the bracket 32 extending behind the basic frame 9. Therefore,
An expansion deck cover 3 which is an aspect of the extension deck cover of the present invention that extends the deck covers 20 and 30 rearward.
6 and 37 are provided to fill the gap.

Further, as shown in FIG. 7, the basic frame 9
The same parts as the first bonnet 23 and the second bonnet 24 shown in FIG. 4 are provided above. In particular, the second bonnet 24 uses the second bonnet 24 shown in FIG. 4 in common because the counterweight 29 provided at the rear of the basic frame 9 has the same shape as the counterweight 8 shown in FIG. can do. Here, in the gap formed between the first bonnet 23 and the second bonnet 24 by providing the second bonnet 24 so as to be positioned behind the basic frame 9, the third bonnet that fills the gap is provided.
A hood 38 is provided.

As shown in FIG. 6 (b), the cab mounting portion 18 enlarged by the expanded floor plate 31 is provided with a cab 28 having a relatively large driver's living space, as shown in FIG. The hydraulic working machine 27 shown in FIG.
Can be formed.

As is apparent from the comparison between the hydraulic working machine 1 and the hydraulic working machine 27 described above, the basic frame 9 which is a main part, the first bonnet 23 and the second bonnet 24 are common. Therefore, the increase in manufacturing cost can be reduced.

Further, in the hydraulic working machine 27 shown in FIG. 5, as another aspect of the expansion frame of the present invention, FIG.
Further, as shown in FIG. 8B, a counterweight 40 integrally provided with an extension floor portion 39 that extends the basic frame 9 rearward may be provided. 8 (a) and 8
6B. In FIG. 6B, the same reference numerals are given to the components commonly used in FIGS. 6A and 6B. The counterweight 40 includes the extension floor portion 39. Therefore, by connecting the extension floor portion 39 to the rear end of the basic frame 9, the basic frame 9 can be easily expanded to provide the counterweight 40. You can In addition,
The counterweight 40 has a rear end outer circumference formed in the same shape as the counterweight 28 shown in FIG. 6A, and can be provided without changing the shape of the second bonnet 24. by this,
The appearance can be formed similarly to the hydraulic working machine 27 shown in FIG. 7.

Next, the hydraulic working machine 41 shown in FIG. 9 will be described. The hydraulic working machine 41 is equipped with a cab 28 having a shape larger than that of the hydraulic working machine 1 shown in FIG. 1 so as to widen a driver's living space. The cab 28 is the same as that provided in the hydraulic working machine 27 shown in FIG. The counterweight 8 of the hydraulic working machine 41 is the same as that attached to the hydraulic working machine 1 shown in FIG.

The hydraulic working machine 41 shown in FIG. 9 is formed by using the basic frame 9 shown in FIG. 2 similarly to the hydraulic working machine 1 shown in FIG. That is, as shown in FIGS. 10A and 10B, the basic frame 9 is provided with deck covers 20 and 30 along the left and right side edges, and the cab mounting portion 18 is further provided with the deck covers 20 and 30. An expansion floor plate 31, which is a form of an expansion frame that expands the frame 9, is attached.

Further, as shown in FIG. 11, the same ones as the first bonnet 23 and the second bonnet 24 shown in FIG. 4 are provided on the basic frame 9.

As is apparent from the comparison between the hydraulic working machine 1 and the hydraulic working machine 41 as described above, the rear part of the cab 28 allows the driver to turn within the vehicle width and has a wide habitation space for the driver. The thing to mount can be easily formed. In recent years, small-scale hydraulic excavators capable of turning within a substantially vehicle width, such as the hydraulic working machine 1 described above, are generally applied to work sites in narrow places such as urban areas. On the other hand, even at a work site in a narrow space, since the work is performed in the front, there is a case where the front, that is, the portion where the boom 4 and the cab 28 are provided does not necessarily need to turn within the vehicle width. In such a case, a cab 28 having a wide living space for the driver is installed to ensure comfortable habitability for the driver, and the rear side is used as the counterweight 8 for small turns without the driver having to worry about the rear. Allow work to be done. This can improve work efficiency.

Further, similarly to the hydraulic working machine 1 described above,
A boom bracket 19 for pivotally attaching the base of the boom 4 is provided behind the front end edge of the basic frame 9. Therefore, the pivoting position of the boom 4 should be close to the turning axis of the basic frame 9. It is possible to improve stability.

Moreover, even in the hydraulic working machine 41, as shown in FIG.
The cab mounting portion 18 is commonly used by using the shown basic frame 9 in common.
An expansion floor plate 31 which is a form of an expansion frame
And the cab support frame 18a for supporting the extended floor plate 31 from below, and the cab mounting portion 18 is provided.
Can be easily expanded, so that the manufacturing cost associated with the specification change can be reduced.

Further, based on the basic frame 9 shown in FIG. 2, as shown in FIG. 12 as a third embodiment, as shown in FIG.
In the hydraulic working machine 1 shown, it is easy to change only the position of the counterweight 8. That is, a counter in which the basic frame 9 shown in FIG. 2 is integrally provided with the bracket 32 and the counter weight 29 which are the expansion frames shown in FIG. 6A or the expansion floor portion 39 shown in FIG. 8A. The hydraulic working machine 42 having the shape shown in FIG. 12 can be formed only by providing the weight 40 and providing the expansion deck covers 36, 37 and the third bonnet 38.

As described above, the hydraulic working machines 27,
The reference frames 41 and 42 can commonly use the basic frame 9 used for the turning frame 3 of the hydraulic working machine 1 depending on the arrangement of the cabs 7, 28, various devices, and the counterweights 8, 29 and the intended use. The basic frame 9 can be configured by simply expanding it with various expansion frames such as an expansion floor plate 31 and a bracket 32. By using the basic frame 9 in common, each hydraulic working machine 1, 27, 41, 42 can be used. Manufacturing cost can be reduced.

In each of the above embodiments, the basic frame 9 can be expanded without changing the mounting positions of various devices on the basic frame 9, but the basic frame 9 is expanded. In this case, a mounting space for various devices can be secured relatively large on the swivel frame 3, so that the mounting positions of various devices can be changed according to the shape of the swivel frame 3. As a result, various devices can be arranged in a well-balanced manner according to the shape of the expanded swivel frame 3. The swivel frame 3 has a larger space for mounting various devices when the basic frame 9 is expanded by the various expansion frames described above, as compared with the case where the swivel frame 3 is composed of only the basic frame 9. Therefore, the arrangement of various devices mounted on the swivel frame 3 is not limited to the arrangement suitable for the basic frame 9 alone, but may be the arrangement suitable for expanding the basic frame 9 by the expansion frames. To be Therefore, a plurality of arrangements of various devices that are suitable for the case of only the basic frame 9 and the case of expanding the basic frame 9 by each of the expansion frames are set in advance on the basic frame 9 in plural ways, whereby The arrangement of various devices on the basic frame 9 can be selectively adopted depending on the shape of No. 3, that is, depending on whether or not the expansion frames are provided on the basic frame 9.

Further, in this embodiment, the basic frame 9 is expanded when selectively mounting a plurality of types of cabs having different shapes, and the basic frame 9 is changed in accordance with a change in the mounting position of the counterweight 8. Although an extension has been described, but not shown, according to the invention, for example,
In order to expand the space for mounting the internal combustion engine or hydraulic equipment on the swivel frame 3, it is possible to provide another expansion frame that supports the internal combustion engine or hydraulic equipment protruding from the basic frame 9. At this time, the expansion frame provided to expand the basic frame 9 is not limited to that shown in the present embodiment, and various shapes having various shapes are selectively attached corresponding to the attachment position to the basic frame 9. Needless to say.

As is clear from the above description, when the hydraulic working machine is used in a relatively narrow work site, the above counterweight is attached to the basic frame 9.
When the work site is relatively large and a large size of the main equipment is required, the bracket 32 is attached to the base frame 9 when the expansion frame is used without being attached.
It is also possible to attach an extension frame for the counterweight such as the extension floor portion 39 or the like to form a space on the swivel frame 3 in which large-sized main equipment can be mounted, so that the swivel frame 3 having a different size can be used depending on the intended use. However, it is possible to reduce the manufacturing cost by using the basic frame 9 in common.

[Brief description of drawings]

FIG. 1 is a configuration of a slave without an expansion frame attached .
The one side view which shows the conventional hydraulic working machine.

FIG. 2 is a plan view schematically showing a basic frame in a form in which an expansion frame is not attached .

3 (a) is 2 shows a plan view and a partially exploded of by that usage scenario in the basic frame shown schematically in a plan view after assembly of the (b) is (a).

4 is an explanatory plan view of the hydraulic working machine shown in FIG. 1. FIG.

FIG. 5 is a side view of the hydraulic working machine according to the first embodiment of the present invention .

FIG. 6 (a) is a plan view schematically showing a part of the first configuration example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. 6 (b) is a view after assembly of FIG. Plan view.

7 is an explanatory plan view of the hydraulic working machine shown in FIG.

FIG. 8A is a plan view schematically showing a part of the second configuration example of the basic frame shown in FIG. 2 in a disassembled state, and FIG. Plan view.

FIG. 9 is a side view of a hydraulic working machine according to a second embodiment of the present invention .

FIG. 10 (a) is a plan view schematically showing a part of the third structural example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. 10 (b) is a plan view after assembly of FIG. Fig.

11 is an explanatory plan view of the hydraulic working machine shown in FIG. 9. FIG .

FIG. 12 is an explanatory plan view of a hydraulic working machine according to a third embodiment of the present invention .

[Explanation of symbols]

1, 27, 41, 42 ... Hydraulic working machine, 2a ... Traveling body, 7
... Cab (small turning cab), 8 ... Counterweight (small turning counterweight), 9 ... Basic frame, 1
8a ... Cab support frame (expansion frame), 23 ... First bonnet (front bonnet), 24 ... Second bonnet (rear bonnet), 28 ... Cab (normal type cab), 29, 40 ... Counterweight (extended type) Counter weights), 29a, 40a ... Weight members , 31 ... Expansion floor plate (expansion frame), 32 ... Bracket (expansion frame), 38 ... Third bonnet (intermediate bonnet), 39 ... Expansion floor portion (expansion frame).

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidehiko Oda 1410-12 Ado, Numata-cho, Asanan-ku, Hiroshima-shi, Hiroshima (72) Inventor Hirokazu Imajige 4-53-34, Gion, Asanami-ku, Hiroshima-shi, Hiroshima B204 (72) Inventor Keiichi Okumura 2-18-3 Ropponmatsu, Hatsukaichi-shi, Hiroshima (56) References JP-A-9-88124 (JP, A) JP-A-7-238571 (JP, A) Sankaihei 4-99750 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02F 9/00 E02F 9/08 E02F 9/16 E02F 9/18

Claims (10)

(57) [Claims] 1. A traveling body and a swingable structure provided on the traveling body.
In the hydraulic working machine including a turning frame, the turning frame includes a basic frame formed in a shape capable of turning within a substantially vehicle width of the traveling body, and an expansion frame for expanding the basic frame, The expansion frame is attached to the basic frame as necessary in accordance with the arrangement of the cab mounted on the swing frame, the internal combustion engine, various equipment including hydraulic equipment, and the counterweight on the swing frame,
The counterweight is a small turning counterweight formed so as to substantially fit within the turning locus of the basic frame, or at least an extension type formed to extend outward from the turning locus of the basic frame when turning. A counterweight, wherein the small turning counterweight and the extended type counterweight are selectively attached to each other. 2. The expansion frame is formed in a plurality of kinds in different shapes corresponding to the mounting positions on the basic frame, and each expansion frame is selectively mounted on the basic frame. The hydraulic working machine according to claim 1 . Wherein the extension設型counterweight, an extension frame composed of the weight support member attached to the base frame, according to claim 1 or 2, characterized in that it comprises a weight member attached to the expansion frame Hydraulic working machine. 4. The hydraulic working machine according to claim 3 , wherein an under cover is provided to cover a gap between the basic frame and the weight member when the extended type counterweight is attached to the basic frame. . Wherein said extension設型counterweight claim 1 or 2, wherein the expansion frame and the weight member comprising a frame extending member attached to the base frame, characterized in that it is constructed integrally Hydraulic working machine. Weight wherein said extension設型counterweight hydraulic working machine according to any one of claims 1 to 5, characterized in that it is smaller than the weight of the small turning counterweight . 7. A rear end shape of the small turning counterweight is a substantially arcuate shape centered on a turning axis of a basic frame to which the small turning counterweight is attached, and the extended type counterweight. 7. The rear end shape is a substantially arcuate shape having a radius substantially the same as that of the small turning counterweight, according to any one of claims 1 to 6.
The hydraulic working machine according to the item. 8. The rear end portion of the extended type counterweight is
The hydraulic working machine according to claim 7 , which has the same shape as the rear end of the small turning counterweight. 9. A rear bonnet covering a rear portion of the basic frame when the small turning counterweight is provided at a rear end portion of the basic frame, and a front bonnet covering a front portion of the basic frame. When the extension type counterweight having an extension frame is provided behind the basic frame, the extension frame is covered with the rear bonnet, and the rear side of the basic frame between the rear bonnet and the front bonnet is covered. The hydraulic working machine according to claim 7 or 8, further comprising an intermediate bonnet that covers. Wherein said basic frame, before according to any one of claims 1 to 9, characterized in that extending設用Dekkikaba over corresponding to Kinobe設型counterweight is capable with preparative Hydraulic working machine.