JP4049712B2 - Hydraulic working machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic working machine such as a hydraulic excavator.
[0002]
[Prior art]
BACKGROUND ART A hydraulic working machine such as a hydraulic excavator includes a turning frame provided on a traveling body so as to be turnable. A cab on which an operator rides is provided on a part of the turning frame, and a counterweight is attached to the rear part of the turning frame. The swivel frame includes various devices such as a hydraulic motor and main devices such as an internal combustion engine as a driving source thereof, various hydraulic cylinders, a tank for storing hydraulic oil, and a fuel tank for storing fuel for the internal combustion engine. Is installed.
[0003]
By the way, various devices mounted on the swing frame have various shapes and sizes, and various sizes of the swing frame are employed depending on the mounting space of the various devices.
[0004]
For example, the cab has a plurality of shapes such as a small cab in which a driver's living space is relatively narrow and a relatively large cab that forms a wide living space. In addition, the counterweight is provided at the rear peripheral edge of the swing frame, but the mounting position of the counterweight (distance from the rotation axis of the swing frame) may be changed depending on the usage or configuration. In such a case, it is necessary to design and manufacture the swing frames having different shapes depending on the size of the cab or the position where the counterweight is attached, resulting in an increase in cost.
[0005]
Also, this type of hydraulic working machine has a small turning frame in which the turning trajectory is almost contained in a circle whose diameter is the width of the vehicle when the working site where it is used is relatively narrow. However, if a relatively large main equipment is required, the swivel frame will also be large. As described above, the swivel frame provided in the hydraulic working machine is different in size to suit the intended use, and this also requires the design and manufacture of a plurality of swivel frames having different shapes, which increases costs. There is an inconvenience.
[0006]
Furthermore, this type of hydraulic excavator has a plurality of vehicle body shapes even in the same class of models (the same main equipment such as an internal combustion engine and a tank). That is, the main equipment such as the internal combustion engine and the tank is the same, but the turning track is provided with a turning frame almost enclosed in a circle whose diameter is the vehicle width, or the weight of the counterweight is relatively small. In order to reduce the weight, there is a counter weight that is provided to extend rearward of the vehicle body at a relatively long distance from the rotating shaft of the revolving frame. Since these models have different cab sizes and counterweight positions even in models of the same class, it is necessary to manufacture their own swivel frames. Furthermore, it is necessary to manufacture bonnets corresponding to the revolving frames having different shapes, which disadvantageously increases the manufacturing cost of each hydraulic excavator.
[0007]
[Problems to be solved by the invention]
In order to eliminate such inconveniences, the present invention can be applied to the case where the mounting space of various devices on the swing frame or the usage application of the hydraulic working machine is different, and the size of the cab and the counterweight of the same class model can be reduced. 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 positions are different.
[0008]
[Means for Solving the Problems]
  In order to achieve such an object, the present invention provides a hydraulic working machine that includes a traveling body and a pivoting frame that is pivotably provided on the traveling body, and the size of the pivoting frame varies depending on the intended use. The turning frame is formed in a shape that can turn within the vehicle width of the traveling body, and the basic frame is used in common among hydraulic working machines having different sizes of the turning frame, and the basic frame is expanded. An extension frame, wherein the basic frame isA small turning cab capable of turning within the approximate vehicle width of the traveling body, and a normal cab having a shape that is within the approximate vehicle width of the traveling body during non-turning and that protrudes outward from the vehicle width of the traveling body during turning.A cab mounting portion capable of selectively mounting the expansion frame,When the normal cab is mounted on the cab mounting portion, the position is within the vehicle width of the traveling body when the basic frame is not turned according to the shape of the bottom of the normal cab.It is attached.
[0009]
  According to the present invention,When a small turning cab having a shape capable of turning within the approximate vehicle width of the traveling body is mounted, a turning frame is configured without attaching the extension frame to the basic frame, and the approximate vehicle width of the traveling body when not turning. When mounting a normal cab that is located inside and that protrudes outward from the vehicle width of the traveling body during turning, the extension frame can be attached to the basic frame to constitute the turning frame.As described above, by attaching the extension frame to the basic frame as necessary, the necessary mounting space can be formed by using the basic frame in common, and the manufacturing cost can be reduced.
[0010]
The basic frame may be formed in a shape capable of turning within the vehicle width of the traveling body as a minimum size for housing various devices including the cab, the internal combustion engine, and the hydraulic device. The basic frame is affected by the arrangement of main equipment such as the internal combustion engine and various tanks mounted on the basic frame, and may have a portion that protrudes slightly outward from the vehicle width of the traveling body. Even in such a case, it may be formed so as to turn substantially within the vehicle width of the traveling body.
[0012]
  In the present invention,The swivel frame isA plurality of types are formed in different shapes corresponding to the mounting positions on the basic frame.With other expansion frames and other of themExpansion frame can be selectively attached to the base frameIs preferred.
[0013]
  in this caseThe basic frame is an extension frame only where it is necessary depending on the shape of the various devices mentioned above.And other expansion framesBy attaching, the swivel frame can be formed in a desired shape without newly designing / manufacturing, thereby preventing an increase in cost.
[0014]
  That is, when the cab, the internal combustion engine, various devices including hydraulic equipment, and the counterweight mounted on the swing frame can be accommodated in the basic frame, the swing frame is configured only by the basic frame. If any of the cab, internal combustion engine, hydraulic equipment, and counterweight mounted on the swing frame does not fit in the basic frame, attach an expansion frame or other expansion frame to the basic frame. A swivel frame with a large mounting space is constructed. In this manner, by attaching the extension frame to the basic frame as necessary, the necessary mounting space can be formed by using the basic frame in common, and the manufacturing cost can be reduced.
[0016]
  When the extension frame is extended on the basic frame and the normal cab is mounted on the extension frame, the extension frame is supported by the other extension frame that supports a portion extending from the base frame from below. It is connected to a cab mounting part.
[0017]
  In this way, the extension frame to the cab mounting partAnd other extension framesBy installing and removingWith a small turning cab and a normal cabRegardless of whether a small-turn cab or a normal cab is installed, it can be handled by simply providing an expansion frame, so the basic frame must be of a common shape. And the increase in manufacturing cost can be reduced.
[0018]
  In addition, when the basic frame has a counterweight mounting portion at the rear part thereof, when the counterweight is mounted behind the counterweight mounting portion of the basic frame,otherAn extension frame is attached to the basic frame in accordance with the mounting position of the counterweight. In other words, when mounting a counterweight on the counterweight mounting section of the basic frameThe otherWhen configuring a swivel frame without providing an expansion frame and mounting a counterweight at a position behind the counterweight mounting portion of the basic frame,The otherA counterweight can be mounted at a position behind the counterweight mounting portion of the basic frame via the extension frame.
[0019]
  In addition, the present invention is provided with a traveling body and a turnable on the traveling body.ThisIn the hydraulic working machine provided with the swivel frame, the swivel frame includes a basic frame and an expansion frame that extends the basic frame, and the expansion frame corresponds to a configuration that is required according to the intended use of the hydraulic work machine. Can be attached to the basic frame as needed.
[0020]
For example, in the case of a hydraulic working machine used in a relatively narrow work site, the main equipment is laid out on the basic frame without attaching an expansion frame to the basic frame. When the work site is relatively wide and a large-sized main device is required, an expansion frame is attached to the basic frame to form a space in which the large main device can be mounted. Thus, even if the size of the turning frame adapted to the intended use is different, the basic frame can be used in common, and the cost can be reduced.
[0021]
Also in this case, as described above, a plurality of types of the extension frames are formed in different shapes corresponding to the attachment positions to the basic frame, and each extension frame is selectively used as a basic frame. By attaching, the expansion frame can be attached only to the places that are necessary for the intended use, and the swivel frame can be formed in the desired shape without newly designing and manufacturing, thus preventing an increase in cost. Can do.
[0022]
  According to the present invention, for example, even in a relatively small work site, when it is desired to secure a relatively large living space for the driver, an extension frame is provided on the front side of the basic frame and a normal cab is mounted. The counterweight for small turning can be attached to the rear side of the basic frame so that only the rear part can turn within the vehicle width. As a result, the driver can comfortably work in a large living space without worrying about the rear at the work site. Moreover,Abbreviation of running bodyTo the basic frame formed in a shape that can turn within the vehicle width,When turningEven when mounting a normal cab that protrudes outward from the vehicle width, the layout of various devices including internal combustion engines and hydraulic equipment does not need to be changed on the basic frame. An increase in cost can be prevented.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a hydraulic working machine of the present embodiment, FIG. 2 is a plan view schematically showing the basic frame of the present embodiment, and FIG. 3A is a first configuration of the basic frame shown in FIG. FIG. 3B is a plan view schematically showing an exploded part of the example, FIG. 3B is a plan view after assembly of FIG. 3A, and FIG. 4 is an explanatory plan view of the hydraulic working machine shown in FIG. 5 is a side view of another hydraulic working machine, FIG. 6A is a plan view schematically showing a part of the second structural example of the basic frame shown in FIG. 2, and FIG. 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 part of a third configuration example of the basic frame shown in FIG. FIG. 8B is a plan view after assembly of FIG. 8A, FIG. 9 is a side view of another hydraulic working machine, and FIG. 10A is FIG. The fourth structure with the basic frame of FIG. 10 (b) is a plan view after assembly of FIG. 10 (a), FIG. 11 is an explanatory plan view of the hydraulic working machine shown in FIG. 12 is an explanatory plan view of a hydraulic working machine according to another embodiment.
[0024]
As shown in FIG. 1, a hydraulic working machine 1 according to the present embodiment is a small hydraulic excavator configured to perform work in a narrow place, and is provided on a traveling body 2a and on the traveling body 2a so as to be turnable. And the revolving body 2b. The swivel body 2b is configured based on a swivel frame 3 that constitutes a floor portion, and a boom 4, an arm 5, and a bucket 6 extend forward on the swivel frame 3. Further, the turning frame 3 includes a cab 7 that forms a driver's living space, and a counterweight 8.
[0025]
The turning frame 3 is formed by a basic frame 9 as shown in FIG. As shown in FIG. 2, the basic frame 9 has a shape that fits in a circle whose diameter is the vehicle width formed by the lateral width of the traveling body 2a in a plan view. It is formed so that the part which protrudes is 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 locus. Various devices such as a battery 10, a hydraulic oil tank 11, an operation valve 12, a swing motor 13, a pump 14, an engine 15, a radiator 16, and a fuel tank 17 are mounted on the basic frame 9, and the cab 7 is mounted. The cab mounting portion 18 is provided. A boom bracket 19 that pivotally attaches the base of the boom 4 is provided behind the front edge of the basic frame 9.
[0026]
As shown in FIG. 3A, the basic frame 9 has deck covers 20 and 21 attached along the left and right side edges, a floor plate 22 attached to the cab mounting portion 18, and a counter edge at the rear edge. The weight 8 is fixed and the revolving frame 3 is configured as shown in FIG.
[0027]
On the floor plate 22 of the cab mounting portion 18, as shown in FIG. 4, the relatively small cab 7 for small turning that fits in a circle having a vehicle width as a diameter is attached. Also, 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. The 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 on the rear side of the basic frame 9. The pump 14, the engine 15, the radiator 16 and the like mounted thereon are covered. As shown in FIG. 4, the second bonnet 24 has a substantially semicircular shape in plan view, and the rear end side is formed in a shape corresponding to the arc shape of the counterweight 8. Further, the turning motor 13 and the fuel tank 17 are covered with guard members 25 and 26, respectively. In this way, the hydraulic working machine 1 capable of small turning according to the use for working in a narrow place as shown in FIG. 1 is formed.
[0028]
  Next, the hydraulic working machine 27 shown in FIG. 5 will be described. In the hydraulic working machine 27, the shape of the cab 28 is larger than that of the hydraulic working machine 1 shown in FIG. 1 in order to widen the driver's living space. The counterweight 29 of the hydraulic working machine 27 has the same shape as that attached to the hydraulic working machine 1 shown in FIG. 1, but is attached so as to be located behind the hydraulic working machine 1 shown in FIG. Attached to the hydraulic working machine 1 shown in FIG.ThisA counterweight 29 that is lighter than the counterweight 8 is used.
[0029]
The hydraulic working machine 27 shown in FIG. 5 is formed using the basic frame 9 shown in FIG. 2 in the same manner as the hydraulic working machine 1 shown in FIG. That is, as shown in FIGS. 6A and 6B, 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 has the basic cover. An expansion floor plate 31 that is one form of an expansion frame that extends the frame 9 is attached. Further, the extended floor plate 31 is connected to the cab mounting portion 18 by a cab support frame 18a that supports the extending portion from below. Further, a bracket 32 which is another form of the extension frame is provided behind the basic frame 9, and a counterweight 29 is fixed via the bracket 32. Further, under guards 33, 34, and 35 are provided below the bracket 32. The bracket 32 extends behind the basic frame 9 so that a gap is formed between the deck covers 20 and 30 and both ends of the counterweight 29. Accordingly, the expansion deck covers 36 and 37 for extending the deck covers 20 and 30 rearward are provided to fill the gap.
[0030]
Further, as shown in FIG. 7, the same thing as the first bonnet 23 and the second bonnet 24 shown in FIG. In particular, the second bonnet 24 uses the second bonnet 24 shown in FIG. 4 in common because the counterweight 29 provided behind the basic frame 9 has the same shape as the counterweight 8 shown in FIG. can do. Here, the second bonnet 24 is provided so as to be positioned behind the basic frame 9, so that the third bonnet 38 filling the gap is formed in the gap formed between the first bonnet 23 and the second bonnet 24. Is provided.
[0031]
As shown in FIG. 6 (b), the cab mounting portion 18 enlarged by the expansion floor plate 31 is mounted with a cab 28 having a relatively large living space for the driver as shown in FIG. The hydraulic working machine 27 shown in FIG. 5 can be formed.
[0032]
In this way, as is apparent from a comparison between the hydraulic working machine 1 and the hydraulic working machine 27 described above, the first bonnet 23 and the second bonnet 24 are used in common, including the basic frame 9 which is the main part. Therefore, the increase in manufacturing cost can be reduced.
[0033]
Further, in the hydraulic working machine 27 shown in FIG. 5, as another embodiment of the expansion frame of the present invention, as shown in FIGS. 8 (a) and 8 (b), an expansion floor portion for extending the basic frame 9 rearward. You may provide the counterweight 40 in which 39 was integrally provided. 8A and 8B, parts that are used in common with FIGS. 6A and 6B are denoted by the same reference numerals. Since the counterweight 40 includes the extended floor portion 39, the basic weight 9 can be easily extended to provide the counterweight 40 by connecting the extended floor portion 39 to the rear end of the basic frame 9. Can do. The counterweight 40 has a rear end outer periphery formed in the same shape as the counterweight 28 shown in FIG. 6A described above, and is provided without changing the shape of the second bonnet 24. it can. Thereby, the appearance can be formed in the same manner as the hydraulic working machine 27 shown in FIG.
[0034]
Next, the hydraulic working machine 41 shown in FIG. 9 will be described. The hydraulic working machine 41 is mounted with a cab 28 having a shape larger than that of the hydraulic working machine 1 shown in FIG. 1 in order to widen the driver's living space. This 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.
[0035]
The hydraulic working machine 41 shown in FIG. 9 is formed using the basic frame 9 shown in FIG. 2 in the same manner as the hydraulic working machine 1 shown in FIG. That is, as shown in FIGS. 10 (a) and 10 (b), 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 has the basic cover. An expansion floor plate 31 that is one form of an expansion frame that extends the frame 9 is attached.
[0036]
Further, as shown in FIG. 11, the same thing as the first bonnet 23 and the second bonnet 24 shown in FIG.
[0037]
In this way, as is apparent from a comparison between the hydraulic working machine 1 and the hydraulic working machine 41 described above, the rear portion is capable of turning within the vehicle width and is mounted with the cab 28 having a large driver's living space. Can be easily formed. 2. Description of the Related Art In recent years, a small hydraulic excavator that can swivel within a substantially vehicle width is generally used like a hydraulic work machine 1 described above in a narrow work site such as an urban area. On the other hand, even in a narrow work site, the work is performed in the front, so the front, that is, the portion where the boom 4 and the cab 28 are provided may not necessarily turn within the vehicle width. In such a case, the driver's comfortable occupancy is secured by installing the cab 28 having a large driver's living space, and the driver does not care about the rear by using the counterweight 8 for a small turn as the rear side. Make work possible. Thereby, working efficiency can be improved.
[0038]
Further, since the boom bracket 19 for pivotally mounting the base of the boom 4 is provided behind the front edge of the basic frame 9 in the same manner as the hydraulic work machine 1 described above, the pivot position of the boom 4 is set. A structure close to the pivot axis of the basic frame 9 can be taken, and thereby the stability can be improved.
[0039]
Moreover, also in the hydraulic working machine 41, the basic frame 9 shown in FIG. 2 is used in common and the cab mounting portion 18 supports the expansion floor plate 31 which is one form of the expansion frame and the expansion floor plate 31 from below. Since the cab support frame 18a is provided and the cab mounting part 18 can be easily expanded, the manufacturing cost accompanying a specification change can be reduced.
[0040]
Further, based on the basic frame 9 shown in FIG. 2, as shown in FIG. 12 as another embodiment, it is easy to change only the position of the counterweight 8 in the hydraulic working machine 1 shown in FIG. That is, a counter in which the basic frame 9 shown in FIG. 2 is integrally provided with the bracket 32 and the counterweight 29 which are the extension frames shown in FIG. 6A or the extension floor portion 39 shown in FIG. The hydraulic working machine 42 having the shape shown in FIG. 12 can be formed simply by providing the weight 40 and providing the expansion deck covers 36 and 37 and the third bonnet 38.
[0041]
As described above, each of the hydraulic working machines 27, 41, and 42 described above is used for the swing frame 3 of the hydraulic working machine 1 depending on the arrangement and specification application of the cabs 7, 28, various devices, and counterweights 8, 29. Since the basic frame 9 can be used in common, the basic frame 9 can be configured simply by being extended with various extension frames such as the extension floor plate 31 and the bracket 32, and the basic frame 9 is used in common. Thereby, the manufacturing cost of each hydraulic working machine 1, 27, 41, 42 can be reduced.
[0042]
In each of the above embodiments, an example in which the basic frame 9 can be extended without changing the mounting position of various devices on the basic frame 9 has been shown. However, when the basic frame 9 is extended, Since a mounting space for various devices can be secured on the revolving frame 3, the mounting positions of the various devices can be changed according to the shape of the revolving frame 3. As a result, various devices can be arranged in a well-balanced manner according to the shape of the expanded turning frame 3. Note that the swivel frame 3 has a larger space for mounting various devices when the basic frame 9 is expanded by the above-described various expansion frames, as compared with the case where the revolving frame 3 is configured by only the basic frame 9. For this reason, the arrangement of various devices mounted on the revolving frame 3 is not only suitable for the case of the basic frame 9 alone, but may be suitable for the case where the basic frame 9 is expanded by the extension frames. It is done. Therefore, a plurality of arrangements of various devices suitable for both the case of only the basic frame 9 and the case where the basic frame 9 is expanded by each of the expansion frames are determined in advance on the basic frame 9 to thereby make a turning frame. The arrangement of the various devices on the basic frame 9 can be selectively employed according to the shape of 3, that is, depending on whether or not each expansion frame is provided on the basic frame 9.
[0043]
In the present embodiment, the basic frame 9 is expanded when a plurality of types of cabs having different shapes are selectively mounted, and the expansion of the basic frame 9 due to a change in the mounting position of the counterweight 8 is described. However, although not shown, according to the present invention, for example, in order to expand the mounting space of the internal combustion engine and the hydraulic equipment on the turning frame 3, the internal combustion engine and the hydraulic equipment protruding from the basic frame 9 are supported. Such other extension frames may be provided. At this time, the expansion frame provided to expand the basic frame 9 is not limited to the one shown in the present embodiment, but can be selectively attached in various shapes corresponding to the mounting position on the basic frame 9. Needless to say.
[0044]
As is apparent from the above description, when the hydraulic working machine is used in a relatively narrow work site, it is used without attaching each of the aforementioned expansion frames to the basic frame 9, and the work site is relatively wide. When a large-sized main device is required, the expansion frame such as the bracket 32 and the extended floor 39 is attached to the basic frame 9 to form a space on the revolving frame 3 where a large main device can be mounted. Therefore, even if the size of the swivel frame 3 adapted to the intended use is different, the basic frame 9 can be used in common to reduce the manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a side view showing a hydraulic working machine according to an embodiment of the present invention.
FIG. 2 is a plan view schematically showing a basic frame of the present embodiment.
3A 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. 3B is a plan view after assembly of FIG.
4 is an explanatory plan view of the hydraulic working machine shown in FIG. 1. FIG.
FIG. 5 is a side view of another hydraulic working machine.
6A is a plan view schematically showing a part of the second configuration example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. 6B is a plan view after assembly in FIG.
7 is an explanatory plan view of the hydraulic working machine shown in FIG.
8A is a plan view schematically showing a part of the third configuration example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. 8B is a plan view after assembly in FIG.
FIG. 9 is a side view of a hydraulic working machine according to another embodiment.
10A is a plan view schematically showing a part of the fourth configuration example of the basic frame shown in FIG. 2 in an exploded manner, and FIG. 10B is a plan view after assembly in FIG.
11 is an explanatory plan view of the hydraulic working machine shown in FIG.
FIG. 12 is an explanatory plan view of a hydraulic working machine according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,27,41,42 ... Hydraulic working machine, 2a ... running body, 7 ... cab (cab for small turning), 8 ... counter weight (counter weight for small turning), 9 ... basic frame, 18a ... cab support frame (otherExtended frame), 23 ... 1st bonnet (front bonnet), 24 ... 2nd bonnet (rear bonnet), 28 ... Cab (normal cab), 29, 40 ... Counterweight (extended-type counterweight), 29a, 40a ... Weight part, 31 ... Expansion floor plate (expansion frame), 32 ... Bracket (otherExpansion frame), 38 ... 3rd bonnet (intermediate bonnet), 39 ... Expansion floor (otherExpansion frame).

Claims (4)

In a hydraulic working machine comprising a traveling body and a revolving frame provided on the traveling body so as to be rotatable, the size of the revolving frame varies depending on the intended use.
The swivel frame is formed in a shape that can swivel within a substantially vehicle width of the traveling body, and a basic frame that is used in common among hydraulic working machines having different swivel frame sizes, and extends the basic frame. With an expansion frame,
The basic frame has a small turning cab that can turn within the approximate vehicle width of the traveling body, and a shape that is within the approximate vehicle width of the traveling body when not turning, and that protrudes outward from the vehicle width of the traveling body when turning. It has a cab mounting part that can be selectively mounted with regular cabs ,
When the normal cab is mounted on the cab mounting portion, the extension frame is attached to a position that is substantially within the vehicle width of the traveling body when the basic frame is not turned according to the bottom shape of the normal cab. A hydraulic working machine characterized by that. The swivel frame includes other extension frames formed in a plurality of different shapes corresponding to attachment positions to the base frame, and the other extension frames are selectively attached to the base frame. The hydraulic working machine according to claim 1, characterized in that: When the extension frame is extended on the basic frame and the normal cab is mounted on the extension frame, the extension frame is supported by the other extension frame that supports a portion extending from the base frame from below. The hydraulic working machine according to claim 2 , wherein the hydraulic working machine is connected to a cab mounting portion . The basic frame includes a counterweight mounting portion at a rear portion thereof, and the other extension frame has the counterweight according to the mounting position of the counterweight when the counterweight is mounted behind the counterweight mounting portion of the basic frame. The hydraulic working machine according to claim 2, wherein the hydraulic working machine is attached to a basic frame.

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