JP2016176290A - Small revolving type shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small revolving type shovel in which a low handrail is attached onto a component mounted on a revolving body.SOLUTION: A small revolving type shovel includes a fuel tank 24 and a hydraulic oil tank 26 mounted on a revolving superstructure 3, and a handrail 70 attached to an upper surface of the fuel tank 24. The hydraulic oil tank 26 is disposed on the inner side of the fuel tank 24, and the upper surface of the fuel tank 24 is set to be at a position higher than an upper surface of the hydraulic oil tank 26.SELECTED DRAWING: Figure 5

Description

  The present invention provides a small swivel excavator having a swivel body having a small swivel radius.

  In order to work in a narrow space, a so-called “small swivel excavator” is known in which the swirl radius ratio of the swivel body is reduced. A boom is rotatably attached to the front part of the swing body of the small swing excavator, and a cabin is installed on the left side of the boom. An engine as a power source is disposed behind the boom. In addition, various devices and components necessary for driving the excavator are arranged around the engine. The components include a fuel tank, a hydraulic pump, a hydraulic oil tank, and parts necessary for driving the engine and the hydraulic pump. (For example, refer to Patent Document 1).

JP 2000-144811 A

  A handrail is attached to the small swivel excavator so that an operator who rides on the swivel body and works during maintenance or refueling can grasp it. The height of the handrail needs to be a predetermined height from the place where the operator puts his / her foot.

  In order to obtain a handrail having such a height, it is necessary that the handrail itself has a sturdy structure, and the attachment portion of the handrail also has a sturdy structure. For this reason, a handrail will become expensive.

  Therefore, an object of one embodiment is to provide a small swivel excavator in which a handrail having a low height is mounted on a component mounted on a swivel body.

  In order to achieve the above-mentioned object, according to an embodiment of the present invention, a small turn having a fuel tank and a hydraulic oil tank mounted on an upper turning body, and a handrail attached to the upper surface of the fuel tank. There is provided a small excavator, wherein the hydraulic oil tank is disposed inside the fuel tank, and an upper surface of the fuel tank is set at a position higher than an upper surface of the hydraulic oil tank.

  According to the disclosed embodiment, the handrail whose height is lowered according to the height of the fuel tank is attached to the upper surface of the fuel tank. For this reason, a handrail that is not as strong as a conventional handrail can be used.

It is a side view of the small turning type excavator by one Embodiment of this invention. It is a top view of the small turning type shovel shown in FIG. It is a top view which shows the inside of an upper revolving body. It is the back side view which looked at the inside of an upper revolving body from the back of an excavator. It is a perspective view of the portion in which the fuel tank and the hydraulic oil tank are mounted in the upper swing body. It is a perspective view of a handrail. It is a side view of a handrail. It is a perspective view which shows the state by which the handrail was fallen.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of a small swivel excavator according to an embodiment. Hereinafter, in this specification, the small turning excavator may be simply referred to as “excavator”. An upper swing body 3 is mounted on the lower traveling body 1 of the excavator via a swing mechanism 2. A boom 4 is attached to the upper swing body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 as an end attachment is attached to the tip of the arm 5. As an end attachment, a slope bucket, a kite bucket, or the like may be used.

  The boom 4, the arm 5, and the bucket 6 constitute a drilling attachment as an example of the attachment, and are hydraulically driven by the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9, respectively.

  The upper swing body 3 is provided with a cabin 10 and a power source such as an engine 11 is mounted. In the cabin 10, various operation devices necessary for operation on the driver's seat and the excavator and a controller that controls the drive of the excavator are installed.

  In FIG. 1, when the piston 9a of the bucket cylinder 9 mounted on the arm 5 is installed on a surface having the same height as the installation surface of the crawler, the uppermost portion Th1 of the handrail 70 mounted on the fuel tank 24. Is the highest position in the excavator. That is, the uppermost portion Th1 of the handrail 70 is higher than the uppermost portion Th2 of the handrail 60, the uppermost portion Tc of the cabin, and the pipe Ta to the arm cylinder 8 mounted on the boom 4.

  When the handrail 70 is rotated as will be described later, the uppermost portion Th1 of the handrail 70 is piped to the uppermost portion Th2 of the handrail 60, the uppermost portion Tc of the cabin, and the arm cylinder 8 mounted on the boom 4. It becomes lower than any of Ta.

  Further, the upper surface of the fuel tank 24 is higher than the muffler cover 90.

  FIG. 2 is a plan view of the excavator shown in FIG. 1 as viewed from above. A boom 4 is rotatably supported near the center of the upper swing body 3. The cabin 10 is installed on the left side of the boom 4 on the front side of the upper swing body 3. A urea water tank cover 22 that covers a urea water tank (described later) is attached to the front side of the upper swing body 3 and to the right side of the boom 4. A fuel tank 24 and a hydraulic oil tank 26 are disposed behind the urea water tank cover 22. The fuel tank 24 is disposed outside, and the hydraulic oil tank 26 is disposed inside the fuel tank 24.

  The upper surface of the urea water tank cover 22 and the upper surface of the hydraulic oil tank 26 are used as a passage on which an operator gets during maintenance or the like. On the other hand, the upper surface of the fuel tank 24 is at a position higher than the upper surface of the hydraulic oil tank 26 as will be described later, and is not used as a passage on which an operator gets.

  A handrail 60 is attached from the urea water tank cover 22 to the fuel tank 24 at the outer periphery of the upper swing body 3. The handrail 60 is a rail for protecting the operator from falling down when climbing on the upper swing body 3. The upper end of the handrail 60 extends to the end of the fuel tank 24. From the position where the handrail 60 ends, the handrail 70 extends in the extending direction of the handrail 60. The handrail 70 is attached to the upper surface of the fuel tank 24 and bends inward along a corner of the upper surface of the fuel tank 24. The handrail 70 is provided at a position where the operator can grip the handrail 70 when the operator gets on the upper surface of the hydraulic oil tank 26.

  A muffler cover 90 is provided behind the fuel tank 24 and the hydraulic oil tank 26 so as to cover an exhaust gas treatment device described later. An exhaust pipe (muffler) 92 extending from the exhaust gas treatment device projects from a portion of the muffler cover 90 close to the fuel tank 24.

  The urea water tank cover 22, the fuel tank 24, the hydraulic oil tank 26, the hand rail 60, the hand rail 70, and the muffler cover 90 are disposed on the right side of the upper swing body 3.

  As described above, the boom 4 is rotatably attached to the center of the upper swing body 3. The shape of the rear part of the upper swing body 3 is regulated by the turning radius of the shovel, and is an arc shape with a turning radius. A counterweight 28 is disposed in the center of the rear part of the upper swing body 3. The engine 11 is arranged and fixed in the space between the counterweight 28 and the boom 4. In FIG.1 and FIG.2, since there is the engine hood 30 which covers the upper part of the engine 11, the engine 11 does not appear.

  On the front side of the engine hood 30, there is provided a passage 32 through which an operator gets when the engine hood 30 is opened and maintenance work of the engine 11 is performed. In addition, a working scaffold 34 is provided at a position lower than the passage 32 on the front side of the passage 32. The work scaffold 34 is provided so as to cover a turning motor disposed beside the hydraulic oil tank 26, and also functions as a turning motor cover. When the worker climbs the upper passage 32, he first gets on the lower work scaffold 34 and then climbs the higher passage 32. At this time, the operator can easily climb from the work scaffold 34 to the passage 32 by placing a hand on the portion extending in the vertical direction of the end portion of the handrail 70 described above.

  Next, the arrangement of the components in the upper swing body 3 will be described in more detail with reference to FIGS. FIG. 3 is a plan view showing the inside of the upper swing body 3. FIG. 4 is a rear side view of the inside of the upper swing body 3 as viewed from the rear of the excavator. FIG. 3 shows the inside in a simplified manner with all the covers such as the urea water tank cover 22, the muffler cover 90, and the engine hood 30 removed. FIG. 4 shows the components in a simplified manner with the counterweight 28 disposed at the rear of the upper swing body removed.

  As shown in FIG. 3, the urea water tank 36 is disposed on the right side of the front part on the revolving frame 3 a of the upper revolving structure 3, and the fuel tank 24 and the hydraulic oil tank 26 are disposed behind the urea water tank 36. A urea water pump 38 for supplying urea water to an exhaust gas treatment device to be described later is disposed behind the urea water tank 36 and in front of the hydraulic oil tank 26.

  The engine 11 is disposed in the center of the rear part of the upper swing body 3. The engine cooler 40 and the intercooler 42 are arranged on the side where the fan of the engine 11 is provided (the left side of the engine 11). An air filter 44 for filtering air supplied to the engine 11 is disposed further outside the intercooler 42. Thus, various devices associated with the engine 11 are arranged on the left side of the engine 11, and it is difficult to secure a space for arranging a large device such as an exhaust gas treatment device.

  Therefore, in the present embodiment, the exhaust gas treatment device 50 is disposed above the pump chamber 150 on the right side of the engine 11 (see FIG. 4). However, since the exhaust gas treatment device 50 is a relatively large device, the exhaust gas treatment device 50 is disposed obliquely so that its longitudinal axis is inclined with respect to the front-rear direction of the upper swing body 3. Thus, by arranging the exhaust gas treatment device 50 obliquely, the entire exhaust gas treatment device 50 can be accommodated within the turning radius of the upper swing body 3 above the pump chamber 150.

  Further, by arranging the exhaust gas treatment device 50 above the pump chamber 150, the exhaust gas treatment device 50 can be arranged at a relatively low position with respect to the engine 11. For this reason, the exhaust pipe (muffler) 92 extending upward from the exhaust gas treatment device 50 can be made lower than a predetermined height required for the small turning excavator.

  Here, the exhaust gas treatment device 50 will be briefly described. In the present embodiment, a diesel engine is used as the engine 11, and it is necessary to provide the exhaust gas treatment device 50 in order to satisfy the exhaust gas regulations. The exhaust gas treatment device 50 is installed in the exhaust system of the engine 11 and processes the exhaust gas of the engine to convert it into exhaust gas that has cleared exhaust gas regulations.

  The exhaust gas treatment device 50 includes a first exhaust gas treatment unit (particle filter) 50-1 and a second exhaust gas treatment unit (catalyst reduction device) 50-2, above the first exhaust gas treatment unit 50-1. A second exhaust gas treatment unit 50-2 is arranged. The exhaust pipe (muffler) 92 extends from the upper part of the upper second exhaust gas treatment unit 50-2.

  The exhaust gas discharged from the engine 11 is first supplied to the first exhaust treatment unit 50-1. In the first exhaust treatment unit 50-1, particulates in the exhaust gas are collected by the filter device. The exhaust gas from which the fine particles have been removed is supplied to the second exhaust treatment unit 50-2 provided with the NOx reduction catalyst. In the second exhaust treatment unit 50-2, nitrogen oxides (NOx) in the exhaust gas are reduced by the NOx reduction catalyst. The exhaust gas thus purified is discharged from the exhaust pipe (muffler) 92 of the exhaust gas treatment device 50 to the atmosphere.

  The above-described second exhaust treatment unit is a catalyst reduction device, and continuously reduces NOx using urea water (urea aqueous solution) as a liquid reducing agent. The urea water supplied to the second exhaust treatment unit is stored in the urea water tank 36 described above, and is pumped to the second exhaust treatment unit of the exhaust gas treatment device 50 by the urea water pump 38.

  As described above, the exhaust gas treatment device 50 is disposed above the pump chamber 150. In order to dispose the exhaust gas treatment device 50 above the pump chamber 150, the house frame 100 on which the exhaust gas treatment device 50 is mounted is formed on the revolving frame 3 a of the upper revolving structure 3.

  As shown in FIG. 4, the house frame 100 includes three vertical frames 100-1, 100-2, and 100-3 that are leg members of the frame. The exhaust gas treatment device 50 is mounted on the horizontal frame 100-4 supported by the vertical frames 100-1, 100-2, 100-3.

  Of the three vertical frames 100-1, 100-2, 100-3, the two vertical frames 100-1, 100-2 are engine support members to which an engine mount 102 for mounting the engine 11 is fixed. It is fixed to the swing frame 3 a of the upper swing body 3 through 104. Specifically, the support plate 106 is fixed between the upper end of the engine support member 104 fixed to the turning frame 3 a and the engine mount 102, and the vertical frame 100-1 is fixed to the support plate 106. Therefore, the vertical frame 100-1 extends upward from the support plate 106. Similarly, the vertical frame 100-2 is fixed to the support plate 106 (not shown) and extends upward from the support plate 106. On the other hand, the vertical frame 100-3 is directly fixed to the swing frame 3 a of the upper swing body 3.

  As described above, the engine support member 104 for mounting the engine 11 is used as a part of the vertical frames 100-1 and 100-2 of the house frame 100 for mounting the exhaust gas treatment device 50. The area of the fixed portion of the frame that occupies on 3a can be reduced. As a result, more devices can be mounted on the narrow turning frame 3a.

  In addition, equipment arranged in the pump chamber 150 is attached to the house frame 100 for mounting the exhaust gas treatment device 50. For example, a main filter that filters fuel supplied from the fuel tank 24 to the engine 11 after being discharged from a pump is attached to the horizontal frame 104 of the house frame 100. The pre-filter 54 that filters the fuel before sucking it into the pump is attached to a connecting member that connects the two vertical frames 100-2 and 100-3. The oil filter 58 for filtering the working oil is attached to the vertical frame 100-3 of the house frame. The hydraulic oil pump 56 driven by the engine 11 is fixed to one end of the engine 11. Thus, the house frame 100 for mounting the exhaust gas treatment device 50 is also used for fixing various devices arranged in the pump chamber 150. Further, the exhaust gas treatment device 50 is not necessarily provided.

  Further, the horizontal frame 100-4 is arranged obliquely so that the longitudinal axis thereof is inclined with respect to the front-rear direction of the upper swing body 3, similarly to the exhaust gas treatment device 50. The side surface in the longitudinal direction of the horizontal frame 100-4 faces the side covers provided on both sides of the counterweight 28. Thereby, when an operator opens the side cover, maintenance work such as a filter attached to the house frame 100 is facilitated.

  Next, the arrangement and configuration of the fuel tank 24 and the hydraulic oil pump 26 will be described with reference to FIG. FIG. 5 is a perspective view of a portion where the fuel tank 24 and the hydraulic oil tank 26 are mounted in the upper swing body.

  As shown in FIG. 5, the fuel tank 24 and the hydraulic oil tank 26 are arranged side by side on substantially the right side in the front-rear direction of the upper swing body 3. The fuel tank 24 is on the outside, and the hydraulic oil tank 26 is on the inside. The exhaust gas treatment device 50 described above is disposed obliquely behind the fuel tank 24 and the hydraulic oil tank 26, but is covered with a muffler cover 90 and is not shown in FIG. However, an exhaust pipe (muffler) 92 extending from the exhaust gas treatment device 50 extends upward through the muffler cover 90.

  Next to the muffler cover 90, an engine hood 30 is provided. The engine hood 30 is a cover that covers the engine 11. When performing maintenance work of the engine 11, the operator can open the engine hood 30 and access the engine 11 therein.

  Here, in the present embodiment, the upper surface of the hydraulic oil tank 26 is configured to be used as a passage on which an operator can get on. On the other hand, the upper surface of the fuel tank 24 disposed outside the hydraulic oil tank 26 is located higher than the upper surface of the hydraulic oil tank 26. That is, the fuel tank 24 is formed in a shape that is higher than the hydraulic oil tank 26. Therefore, the fuel tank 24 can store a large amount of fuel as much as the height is increased.

  In addition, when refueling the fuel tank 24, the operator climbs the upper surface of the hydraulic oil tank 26 and injects fuel from a fuel filler opening 24 a provided on the upper surface of the fuel tank 24. The oil supply port 24a is provided at a position inside the handrail 70 bent at about 90 degrees. Therefore, the worker who is refueling can support the body by gripping the handrail 70 attached to the upper surface of the fuel tank 24.

  Usually, a handrail such as the handrail 70 is defined to have a predetermined height from the passage. In the present embodiment, since the passage is the upper surface of the hydraulic oil tank 26, the height of the handrail 70 may be a predetermined height from the upper surface of the hydraulic oil tank 26. Accordingly, the height of the handrail 70 itself may be a height obtained by subtracting the height from the upper surface of the hydraulic oil tank 26 to the upper surface of the fuel tank 24 from a predetermined height. That is, in the present embodiment, the height of the handrail 70 itself can be lowered by an amount corresponding to the height of the fuel tank 24. Further, the height from the work scaffold 34 to the handrail can be sufficiently secured.

  Since the handrail 70 may have a low structure, the force (moment) applied to the attachment portion of the handrail 70 is also reduced, and the strength of the handrail 70 itself can be made lower than the strength required for the conventional handrail. This eliminates the need for the handrail 70 to be as sturdy as a conventional handrail. Further, since the handrail 70 has a low structure, the force (moment) applied to the portion where the handrail 70 is attached to the fuel tank 24 is also reduced. For this reason, the attachment part of the handrail 70 does not need to be as strong as a conventional handrail attachment structure.

  Here, the handrail 72 extends between the fuel tank 24 and an exhaust pipe (muffler) 92 extending upward from the muffler cover 90 behind the fuel tank 24. That is, the exhaust pipe (muffler) 92 is disposed outside the bent handrail 70. Thereby, it is possible to protect the worker who works near the fuel tank 24 from accidentally touching the exhaust pipe (muffler) 92 that is heated by the engine exhaust.

  Further, the handrail 70 is bent at about 90 degrees along the outer corner of the upper surface of the fuel tank 24, and extends vertically in the vicinity of the inner corner of the fuel tank 24 (see FIG. 6). Corresponding to the vertical portion 74b-2 shown in FIG. An operator who rides on a turning motor cover that functions as a work scaffold 34 can support the body by grasping the vertical portion of the handrail.

  As described above, in the present embodiment, the hydraulic oil tank 26 is disposed on the inner side of the fuel tank 24, and the upper surface of the fuel tank 24 is made higher than the upper surface of the hydraulic oil tank 26. While ensuring the upper surface of the oil tank 26, the fuel tank 24 can be enlarged to store more fuel. In addition to this, the handrail 70 itself and the mounting portion thereof can have a structure having a smaller rigidity than that required for a conventional handrail.

  Next, the handrail according to the present embodiment will be further described with reference to FIGS. FIG. 6 is a perspective view of the handrail according to the present embodiment. FIG. 7 is a side view of the handrail according to the present embodiment. FIG. 8 is a perspective view showing a state in which the handrail according to the present embodiment is tilted. Although the handrail 72 shown in FIGS. 6 to 8 is slightly different from the handrail 70 shown in FIG. 5, the handrail 72 will be described as being equivalent to the handrail 70.

  As shown in FIG. 6, the handrail 72 has a rail pipe member 74 formed by bending a pipe material, and two attachment portions 76. The rail pipe member 74 has a horizontal portion 74a and two vertical portions 74b-1 and 74b-2. The horizontal portion 74a is bent substantially at a right angle so as to follow the corner portion of the upper surface of the fuel tank 24. In addition, a reinforcing pipe member 74c that is bent in substantially the same shape as the horizontal portion 74a is provided between the two attachment portions 76. Further, a reinforcing pipe member 74 d extending in the vertical direction is provided from one upper end of the attachment portion 76 to the horizontal portion 74 a of the rail pipe member 74. The reinforcing pipe member 74c is provided as necessary.

  The rail pipe member 74 is provided with a rotating plate 80 at each of two locations, a lower end portion of the vertical portion 74b-1 and a lower end portion of the vertical portion 74b-2. Each of the two attachment portions 76 fixed to the upper surface of the fuel tank 24 has a support pipe member 77 and a support plate 78 fixed to the support pipe member 77. The cross section (outer diameter) of the support pipe member 77 is larger than the cross section (outer diameter) of the rail pipe member, and the support pipe member 77 is sturdy. The support pipe member 77 is not limited to a pipe member having a circular cross section, and may be a pipe member having a polygonal cross section or a member having a H cross section as long as it has sufficient strength.

  The pair of rotating plates 80 attached to the rail pipe member 74 are rotatably attached to the pair of support plates 78 by a rotating shaft 80a. Accordingly, the rail pipe member 74 is supported so as to be rotatable with respect to the attachment portion 76. Therefore, the handrail 72 can be tilted approximately 90 degrees toward the upper surface of the fuel tank 24 as shown in FIG.

  When driving the shovel, as shown in FIGS. 6 and 7, the handrail 72 is fixed at a position where the vertical portions 74b-1 and 74b-2 are vertical. In order to fix the handrail 72, first, the bolt fixing hole 80 b provided in the rotating plate 80 is aligned with one of the two bolt fixing holes 78 b provided in the support plate 78. The two bolt fixing holes 78b provided in the support plate 78 are arranged at equal distances from the rotation shaft 80a that rotatably supports the rotation plate 80, respectively. Then, a bolt may be inserted through the bolt fixing hole 80b and the bolt fixing hole 80b, a nut may be screwed into the bolt, and the rotating plate 80 and the support plate 78 may be fastened and fixed.

  On the other hand, in order to fix the handrail 72 in the tilted position as shown in FIG. 8, first, the above-mentioned bolt is removed from the fixing hole 80b and the bolt fixing hole 78b, and the fixing of the handrail 72 is released. . Then, the handrail 72 is tilted inward toward the upper surface of the fuel tank 24. When the handrail 72 is tilted, the bolt fixing hole 80 b provided in the rotating plate 80 is aligned with the other of the two fixing holes 78 b provided in the support plate 78. Therefore, the removed bolt may be inserted through the bolt fixing hole 80b and the bolt fixing hole 78b, and a nut may be screwed into the bolt so that the rotating plate 80 and the support plate 78 are fastened and fixed.

  In this embodiment, the rotation plate 80 is provided with one bolt fixing hole 80b and the support plate 78 is provided with two bolt fixing holes 78b. However, the rotation plate 80 is fixed with two bolts. A hole 80b may be provided, and one bolt fixing hole 78b may be provided in the support plate 78.

  If the handrail 72 is configured to fall outward, the upper end of the handrail 72 protrudes to the outside of the turning frame. In this case, there is a possibility that peripheral objects may be damaged by the turning operation. Since the handrail 72 according to the present embodiment is configured to be tilted inward toward the upper surface of the fuel pump 24, damage to the surrounding objects is prevented.

  The reason why the handrail 72 is tilted as shown in FIG. 8 is to clear the height restriction when the excavator is transported by truck, and the handrail 72 is shown in FIG. 6 and FIG. It is fixed in the state where it stood vertically. That is, when the handrail 72 (70) is fixed in a vertically standing state, as shown in FIG. 1, the handrail 72 (70) may be at the top of the excavator and the height restriction may not be cleared. is there. Therefore, when the excavator is transported, the handrail 72 (70) is tilted so that the handrail 72 (70) does not exceed the height limit.

  In the present embodiment, the handrail 72 is bent in a shape along the two sides of the upper surface of the fuel tank 24. However, the handrail 72 is not necessarily bent. For example, the horizontal portion 74 of the rail pipe 74 is from one end of the rail pipe member 74 in the front-rear direction of the shovel (the portion corresponding to the vertical portion 74b-1 in FIG. 6 (disposed near the outer edge of the fuel tank 24)). The shape may extend linearly toward the other end closer to the work scaffold 34 (corresponding to the vertical portion 74b-2 in FIG. 6).

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Turning mechanism 3 Upper turning body 3a Turning frame 4 Boom 5 Arm 6 Bucket 7 Boom cylinder 8 Arm cylinder 9 Bucket cylinder 10 Cabin 11 Engine 22 Urea water tank cover 24 Fuel tank 26 Hydraulic oil tank 28 Counterweight 30 Engine Hood 32 Passage 34 Working scaffold 36 Urea water tank 38 Urea water pump 40 Engine cooler 42 Intercooler 44 Air filter 50 Exhaust gas treatment device 50-1 First exhaust treatment unit 50-2 Second exhaust treatment unit 54 Prefilter 56 Operation Oil pump 58 Oil filter 60 Hand rail 70 Hand rail 72 Hand rail 74 Rail 76 Mounting portion 77 Support pipe member 78 Support plate 80 Rotating plate 90 SCR cover 92 Exhaust tube (muffler)
100 house frame 100-1, 100-2, 100-3 vertical frame 102 engine mount 104 engine support member 106 support plate 150 pump chamber

Claims (5)

A fuel tank and a hydraulic oil tank mounted on the upper rotating body;
A small swivel excavator having a handrail attached to the upper surface of the fuel tank,
The hydraulic oil tank is disposed inside the fuel tank;
A small swivel excavator in which the upper surface of the fuel tank is set at a position higher than the upper surface of the hydraulic oil tank. A small swivel excavator according to claim 1,
A small swivel excavator in which a fuel filler opening is provided inside the handrail on the upper surface of the fuel tank. A small swivel excavator according to claim 1 or 2,
A small swivel excavator in which a muffler for releasing engine exhaust to the atmosphere is disposed outside the handrail. A small swivel excavator according to any one of claims 1 to 3,
A small swing excavator in which a swing motor is disposed in the vicinity of the hydraulic oil tank, and a swing motor cover that functions as a scaffold is provided above the swing motor. A small swivel excavator according to any one of claims 1 to 4,
One end of the handrail in the front-rear direction is disposed along the outer edge of the fuel tank, and the other end is disposed at a position closer to the work scaffold than the one end.

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