JP2020122484A - Fuel tank structure of work vehicle - Google Patents

Abstract

To provide a fuel tank structure of a work vehicle that comprises a fuel tank having less fluctuation in the liquid level of fuel due to the tilt of a vehicle attitude at the time when there is a small amount of fuel residual, and that can effectively making use of a peripheral space of the fuel tank.SOLUTION: A fifth region part 32e of a second panel 32 constituting a fuel tank 30 is formed as a tapered part that is inclined inward and downward of the fuel tank 30, and a space that is formed below the outer surface side of the tapered part and recessed inward of the fuel tank 30 is configured as an arrangement space for a hydraulic oil pipe.SELECTED DRAWING: Figure 10

Description

The present invention relates to a fuel tank structure for a working vehicle including a fuel tank that stores fuel supplied to an engine.

As such a working vehicle, for example, a hydraulic excavator (power shovel, backhoe) including a lower traveling body and an upper revolving body is widely known. In such a working vehicle, an engine and a fuel tank are mounted in an engine chamber provided on the upper swing body side, and the fuel tank and the engine are connected by a fuel supply passage. One end portion of the fuel supply path extends into the fuel tank, and an inlet opening at its tip is arranged near the bottom surface in the fuel tank. Further, a fuel supply pump is arranged in the fuel supply passage, and by driving this fuel supply pump, the fuel in the fuel tank is discharged to the outside of the tank through the fuel supply passage and supplied to the engine. (See, for example, Patent Document 1 below).

JP, 2011-6985, A

In the engine compartment, in addition to the engine and fuel tank, a hydraulic oil tank that stores hydraulic oil for operating hydraulic actuators such as boom cylinders and arm cylinders, and hydraulic oil from the hydraulic oil tank is sent to each hydraulic actuator. Many components such as a hydraulic pump, a control valve, and a hydraulic oil pipe for supply are installed. Therefore, it is required to effectively use the space in the engine room.

Many conventional fuel tanks are formed in a rectangular box shape (rectangular parallelepiped shape) in order to secure a storage capacity and prevent unnecessary space around the fuel tank. However, this type of fuel tank has a problem that the liquid level of the fuel fluctuates greatly when the vehicle is tilted while the remaining amount of fuel in the tank is small. That is, when the vehicle is tilted when the fuel level in the tank is low, the fuel in the tank is biased toward the corner, and the liquid level of the fuel becomes lower than the position of the suction port arranged in the tank. It is easy for the engine to be supplied to the engine. Therefore, in this type of fuel tank, since it is necessary to replenish the fuel early when the fuel remains in the tank to some extent, the amount of fuel that cannot be effectively used and remains in the tank increases.

On the other hand, in order to reduce the fluctuation of the liquid level of the fuel in the tank due to the inclination of the vehicle attitude, it may be possible to provide a taper portion that is inclined toward the bottom surface of the fuel tank at the lower portion. By providing such a tapered portion, the fuel in the tank is less likely to be biased toward the corner even if the vehicle leans when the remaining fuel amount is small. It is easy to prevent lowering than the mouth position. However, when such a tapered portion is provided, there is a problem that the outer surface side portion of the tapered portion easily becomes a dead space.

The present invention has been made in view of the above circumstances, and is provided with a fuel tank in which the liquid level fluctuation of the fuel due to the inclination of the vehicle posture when the remaining fuel amount is small is small, and to effectively use the periphery of the fuel tank. It is an object of the present invention to provide a fuel tank structure for a working vehicle capable of

In order to achieve the above object, a fuel tank structure for a working vehicle according to the present invention includes a fuel tank for storing fuel supplied to an engine and a hydraulic oil tank for storing hydraulic oil supplied to and discharged from a hydraulic actuator. In a fuel tank structure for a work vehicle (for example, the power shovel 10 in the embodiment), the fuel tank is formed of a steel plate bent at a plurality of positions in a lateral direction, and is divided with the bent position as a boundary. A plate-shaped first side surface portion (for example, the front sleeve plate portion 31b of the first panel 31 in the embodiment) and a second side surface portion connected to the first side surface portion (for example, the first panel 31 in the embodiment A first panel having a panel base portion 31a) and a third side surface portion (for example, a rear sleeve plate portion 31c of the first panel 31 in the embodiment) connected to the second side surface portion, and a plurality of positions in the vertical direction. A plate-shaped upper surface portion (for example, the first region portion 32a of the second panel 32 in the embodiment) which is formed by another steel plate that is bent at, and is divided at the bending position as a boundary, and the fourth upper surface portion A side surface portion (for example, second to fifth area portions 32b to 32e of the second panel 32 in the embodiment) and a bottom surface portion connected to the fourth side surface portion (for example, a sixth area of the second panel 32 in the embodiment). A second panel having a portion 32f), and the peripheral portion of the second panel in a state where both panels are combined so that the end surface of the peripheral portion of the second panel abuts the inner surface of the first panel. Is welded to the inner surface of the first panel to form a closed rectangular parallelepiped shape, and is attached to the body frame member (for example, the support members 81 and 82 in the embodiment) to the mounting member (for example, the mounting bracket in the embodiment). 73 to 75), and the fourth side surface portion of the third side surface portion is at a right angle to the third side surface portion on the inner surface side of the third side surface portion. The reinforcing plate is welded to the inner surface, and the reinforcing plate is welded to the third side surface in a state of being overlapped with the third side surface on the outer surface side of the third side surface part. The end surface portion of the fourth side surface portion (for example, the end surface portion 36 of the fourth region portion 32d of the second panel 32 in the embodiment) is arranged at a position facing each other with the third side surface portion interposed therebetween, The fourth side surface portion is welded and joined to the third side surface portion, and the fourth side surface portion has a tapered portion on the lower end side of the fourth side surface portion that is inclined inward and downward of the fuel tank. Have the taper A space that is formed below the outer surface of the portion and that is recessed inward of the fuel tank is configured as an arrangement space for a hydraulic oil pipe (for example, hydraulic oil pipe 61 in the embodiment) that configures the hydraulic oil supply/discharge passage. It is characterized by being.

In the fuel tank structure for a working vehicle, the mounting member is welded to the reinforcing plate, has a bolt insertion hole, and is fastened and fixed to the vehicle body frame member by a bolt inserted in the bolt insertion hole. Preferably. Further, the vehicle body frame members are installed on both sides of the fuel tank that sandwich the space, and the hydraulic oil pipe is installed so as to pass through the vehicle body frame members on both sides and pass through the space. Preferably.

Further, in the fuel tank structure for the working vehicle, the two corners on the upper end side in the bending position of the first panel extend higher than the upper surface position of the fuel tank, and the pedestal part to which the handrail member is fixed. (For example, the pedestal receiving portions 33 and 34 in the embodiment) are preferably formed.

According to the fuel tank structure for a working vehicle according to the present invention configured as described above, a tapered portion that inclines inward and downward of the fuel tank is provided at the lower end side of the fourth side surface portion of the fuel tank. Since it has, it becomes possible to suppress the fluctuation of the liquid level of the fuel in the tank even when the vehicle leans in a state where the remaining amount of fuel in the fuel tank is small. Further, since the space that is formed below the outer surface of the tapered portion and that is recessed inward of the fuel tank is configured as an arrangement space for the hydraulic oil pipe, it is possible to prevent this space from becoming a dead space. Therefore, it is possible to effectively use the periphery of the fuel tank.

In the fuel tank structure for a working vehicle according to the present invention, the inner surface of the third side surface portion is welded to the inner surface of the third side surface portion at a right angle to the third side surface portion. An end surface portion of the fourth side surface portion and a corner portion of the reinforcing plate which is welded and joined to the third side surface portion in a state of being superposed on the third side surface portion on the outer surface side of the third side surface portion, Since the third side surface portions are arranged so as to face each other across the third side surface portion and are welded and joined to the third side surface portion respectively, it is possible to prevent stress concentration from occurring in the welded joint portions at the corner portions of the reinforcing plate. Is possible.

Further, in the above-described fuel tank structure for a working vehicle according to the present invention, the two corner portions on the upper end side in the bending position of the first panel extend above the upper surface position of the fuel tank, and the handrail member is fixed. If it is formed as a pedestal, it is possible to simplify the work process for fixing the handrail member to the fuel tank.

It is the side view which looked at the crawler type power shovel provided with the fuel tank structure concerning the present invention from the vehicle right side. It is the top view which looked at the above-mentioned power shovel from the upper part. It is the perspective view which looked at the composition inside the engine room of the above-mentioned power shovel from the vehicle front right slanting upper part. FIG. 3 is a perspective view showing the overall configuration of the fuel tank structure as seen from diagonally above and to the rear right of the vehicle. It is a perspective view which shows the outline of the 1st panel and 2nd panel which comprise the fuel tank in the said fuel tank structure. It is the top view which looked at the said fuel tank from the upper part. It is the side view which looked at the fuel tank from the right side of a vehicle. It is the side view which looked at the fuel tank from the vehicle rear side. It is the side view which looked at the fuel tank from the vehicle front side. FIG. 8 is a partial cross-sectional view of the fuel tank taken along the line C-C in FIG. 7. FIG. 7 is a partial end view of the fuel tank taken along the line AA in FIG. 6. FIG. 7 is a partial end view of the fuel tank taken along the line BB of FIG. 6. FIG. 10 is a partial cross-sectional view of the fuel tank taken along the line D-D in FIG. 9. FIG. 6 is a partial cross-sectional view for explaining a problem in the case where the way of combining the first panel and the second panel is changed in the fuel tank.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the present invention is applied to a crawler hydraulic excavator (hereinafter referred to as "power shovel 10") as a work vehicle will be described. First, the overall configuration of the power shovel 10 will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the power shovel 10 is roughly divided into a lower traveling body 11 configured to be capable of traveling and an upper revolving body 12 configured to be rotatable with respect to the lower traveling body 11. The lower traveling body 11 is configured to include a traveling carriage 13 (illustrated in FIG. 1) and a pair of left and right traveling devices 15 that are attached to the traveling carriage 13 and that have endless crawler belts 14. .. On the other hand, the upper revolving superstructure 12 is installed on the upper part of the traveling carriage 13 via a revolving mechanism 16 (shown in FIG. 1) and a revolving base 17 (shown in FIG. 1) and is erected on the upper left side of the revolving base 17. An operator cabin 18 for boarding an operator and an engine room 19 (covered by an engine room cover 19a) are provided from the upper right side to the rear side of the swivel base 17. A shovel mechanism 20 is provided on the front right side of the swivel base 17.

The shovel mechanism 20 is swingably pivoted at a position on the front right side of the swivel base 17 so as to be swingable, and is swingably pivoted vertically at a tip end portion of the boom 21 in a swing plane of the boom 21. The arm 22 and the bucket 23 pivotally connected to the tip of the arm 22 so as to be vertically swingable. A pair of hydraulically driven boom cylinders 24 are provided across the front part of the swivel 17 and the boom 21, and the boom cylinders 24 cause the boom 21 to swing. A hydraulically driven arm cylinder 25 is provided across the boom 21 and the arm 22, and the arm cylinder 25 swings the arm 22. Further, a hydraulically driven bucket cylinder 26 is provided across the arm 22 and the bucket 23, and the bucket cylinder 26 swings the bucket 23.

The operator cabin 18 is formed in the shape of a rectangular box, and is provided with an operator seat (not shown) for the operator to seat forward facing forward. Operating levers (not shown) for operating the driving of the traveling device 15, the turning mechanism 16 and the shovel mechanism 20 are arranged on the left and right of the operator seat.

In the power shovel 10 configured as above, the operator sits on the operator seat in the operator cabin 18 and operates the operation lever, thereby driving the traveling device 15 in accordance with the operation of the operation lever. It is possible to move the vehicle 10 or to drive the turning mechanism 16 to turn the upper turning body 12. Further, according to the operation of the operation lever, the boom cylinder 24 is extended/contracted to swing the boom 21 up and down, the arm cylinder 25 is extended/contracted to swing the arm 22 up and down, and the bucket cylinder 26 is moved. The bucket 23 can be swung up and down by expanding and contracting.

3 and 4 show the upper revolving structure 12 in a simplified state excluding the operator cabin 18, the engine room cover 19a, the shovel mechanism 20, and the like. Hereinafter, referring to FIGS. The outline of the tank structure (arrangement of fuel tank, etc.) will be described.

As shown in FIGS. 3 and 4, a diesel engine (hereinafter referred to as “engine EG”) is installed in the engine room 19 so as to occupy a lot of space on the rear side of the engine room 19. A fuel tank 30 that stores the fuel supplied to the engine EG is installed at the front right position. The engine EG is specifically configured by an intake device, an exhaust device, a cooling device, and the like in addition to the engine body, but these constituent elements are not particularly numbered.

On the left side of the fuel tank 30, a hydraulic oil tank T that stores the hydraulic oil supplied to and discharged from each of the cylinders 24 to 26 is arranged in proximity to the fuel tank 30, and in front of the fuel tank 30, the operation oil tank T is operated. A control valve CV for controlling the supply/discharge direction and flow rate of the hydraulic oil from the oil tank T is arranged. Further, in the peripheral portion of the fuel tank 30, a hydraulic oil pipe 61 (only partly numbered) that constitutes a hydraulic oil supply/discharge passage, and a hydraulic pump (not shown) that is driven by the engine EG to supply hydraulic oil. A fuel hose 62 (shown in FIG. 4) that connects the engine EG and the fuel tank 30 is also arranged.

The fuel tank 30 is provided with a handrail member 50 used when an operator or the like performing maintenance, refueling work, or the like climbs onto the upper swing body 12. The handrail member 50 is configured to include a handrail main body 51 formed of a plurality of steel pipes, and pedestal plates 52 and 53 (shown in FIG. 4) for fixing the handrail main body 51, which are welded to the upper portion of the fuel tank 30. A footrest plate 58 is fixed to the lower portion of the handrail main body 51, and is used by an operator or the like to climb on the upper swing body 12.

Hereinafter, the configuration of the fuel tank 30 will be described with additional reference to FIGS. As shown in FIG. 5, the fuel tank 30 mainly includes a first panel 31 and a second panel 32. The first panel 31 is formed by bending a cut steel plate, and is divided into a panel base portion 31a, a front sleeve plate portion 31b, and a rear sleeve plate portion 31c with the bending position as a boundary. The second panel 32 is also formed by bending a cut steel plate, and is divided into six area portions 32a to 32f from the first area portion 32a to the sixth area portion 32f with the bending position as a boundary. ..

The first area portion 32a forms the upper surface portion of the fuel tank 30, and the sixth area portion 32f forms the bottom surface portion of the fuel tank 30. The second region portion 32b, the third region portion 32c, the fourth region portion 32d, and the fifth region portion 32e constitute the fourth side surface portion of the fuel tank 30 in the present embodiment, and are located on the lowermost end side. The five-region portion 32e is formed as a taper portion that is inclined inward and downward of the fuel tank 30. The first panel 31 and the second panel 32 thus configured are welded to each other and assembled in a box shape. Specifically, the peripheral edge of the second panel 32 with respect to the inner surface of the first panel 31 is in a state in which both end surfaces of the second panel 32 are in contact with the inner surface of the first panel 31 so as to be in contact with each other. The fillets are welded and integrated.

The two corners on the upper end side of the first panel 31 extend higher than the other parts and are formed as pedestal receiving portions 33 and 34 for fixedly supporting the pedestal plates 52 and 53 (see FIG. 6). ing. In detail, as shown in FIG. 11, the pedestal plate 52 includes a pedestal base portion 52a extending horizontally in the figure, an inclined portion 52b extending obliquely downward in the figure from one end side edge portion of the pedestal base portion 52a, and an inclined portion 52b. A foot portion 52c extending horizontally in the drawing from an edge portion on the lower end side is integrally formed. The pedestal plate 52 has the pedestal base 52a placed on the pedestal receiving portion 33 and the foot 52c placed on the first region 32a of the second panel 32, and the pedestal base 52a and the pedestal receiving portion 52a. The fuel tank is obtained by fillet-welding the portion 33, the foot portion 52c, and the first region portion 32a (welding is performed at the corner portions K1 and K2 in FIG. 11 and the corner portion K3 in FIG. 12). It is fixed at 30.

The base plate 53 is configured similarly to the base plate 52. That is, as shown in FIGS. 6 and 7, this pedestal plate 53 is formed by integrally forming a pedestal base portion 53a, an inclined portion 53b, and a foot portion 53c, and the pedestal base portion 53a is placed on the pedestal receiving portion 34. In the state where the foot portion 53c is placed on the first area portion 32a, the pedestal base portion 53a and the pedestal receiving portion 34, and the foot portion 53c and the first area portion 32a of the second panel 32 are fillet welded, respectively. As a result, it is fixed to the fuel tank 30. The handrail main body 51 is fixed to the pedestal plates 52 and 53 welded and fixed to the fuel tank 30. Specifically, the pedestal bases 52a and 53a of the pedestal plates 52 and 53 are provided with bolt insertion holes 54 (shown in FIG. 6), and the bolts (not shown) inserted into the bolt insertion holes 54 are shown. Thus, the legs of the handrail main body 51 are fastened and fixed (see FIG. 11).

When the pedestal receiving portions 33 and 34 as described above are not provided, a pedestal plate having a different shape from the pedestal plates 52 and 53 (for example, a U-shaped cross section having a plurality of legs) is used for the first panel of the second panel 32. A mode in which it is welded to the region 32a is conceivable. However, in this case, stress concentration is likely to occur in the welded portion between the pedestal plate and the first region 32a, so that a reinforcement plate (not shown) is formed in the first region 32a. It is necessary to weld the pedestal plate to the reinforcing plate by welding. On the other hand, in the present embodiment, the pedestal plates 52 and 53 are welded to the pedestal receiving portions 33 and 34 and the first region 32a of the second panel 32 without providing the reinforcing plate, so the reinforcing plate is welded. You can save time. Therefore, the work process for fixing the handrail member 50 to the fuel tank 30 can be simplified and the cost can be reduced. In the case of the present embodiment, the stress generated in the pedestal plates 52 and 53 is dispersed, so that stress concentration on the welded portion is less likely to occur. Further, since the pedestal receiving portions 33, 34 (first panel 31) support a part of the load acting on the handrail member 50, it is advantageous in terms of strength as compared with the case of supporting this load only by the second panel 32. Therefore, the handrail member 50 can be stably supported.

As shown in FIG. 7, an oil supply pipe 41 for replenishing the fuel in the fuel tank 30 is provided on the upper surface of the fuel tank 30 (the first area 32 a of the second panel 32 ). A drain pipe 42 for discharging impurities such as fuel and dust remaining in the fuel tank 30 is provided on the bottom surface portion (sixth region portion 32f of the second panel 32). Further, in the fuel tank 30, a fuel discharge pipe 43 forming a part of a fuel supply path for supplying the fuel in the fuel tank 30 to the engine EG, and the fuel returning from the engine EG is guided into the fuel tank 30. A fuel return pipe 44 is provided.

The fuel discharge pipe 43 is formed in a crank shape, one end of the fuel discharge pipe 43 extends close to the center of the bottom surface of the fuel tank 30, and a fuel suction port 43a (see also FIG. 10) is opened at the tip thereof. .. The other end of the fuel discharge pipe 43 extends to a position higher than the one end and protrudes from the rear sleeve plate portion 31c of the first panel 31 to the outside, and a fuel discharge port 43b is opened at the tip thereof. On the other hand, as shown in FIG. 10, the fuel return pipe 44 is formed in an L shape, one end of which extends to near the bottom of the fuel tank 30, and a fuel return outlet 44a is opened at the tip thereof. doing. The other end portion of the fuel return pipe 44 extends to a position higher than the one end portion, protrudes from the panel base portion 31a of the first panel 31 to the outside, and has a fuel return inlet 44b at the tip thereof.

A fuel supply hose (not shown in FIG. 10, shown as a fuel hose 62 in FIG. 4) that connects the fuel tank 30 and the engine EG is connected to the discharge port 43 b of the fuel discharge pipe 43, and passes through the fuel discharge pipe 43. The stored fuel discharged from the discharge port 43b is supplied to the engine EG through the fuel supply hose. Further, one end of a fuel return hose (not shown) that connects the fuel tank 30 and the engine EG is connected to the return inlet 44b of the fuel return pipe 44, and reaches the return inlet 44b through the fuel return hose. Return fuel from the engine EG is stored in the fuel tank 30 through the fuel return pipe 44.

As shown in FIG. 10, the fifth region portion 32e of the second panel 32 is formed as a tapered portion that inclines inward and downward of the fuel tank 30, as described above. By forming such a tapered portion, even if the vehicle (and the fuel tank 30) leans in a state where the fuel remaining amount in the fuel tank 30 is small, the fuel in the fuel tank 30 is less likely to be biased toward the corners. Therefore, it becomes possible to suppress the liquid level fluctuation of the fuel in the fuel tank 30. Therefore, it is easy to prevent the liquid level of the fuel in the fuel tank 30 from becoming lower than the position of the suction port 43a of the fuel discharge pipe 43 when the vehicle leans, and the fuel level is reduced even when the remaining amount is low. It becomes possible to use it effectively.

Further, since the fifth region 32e of the second panel 32 is formed as a tapered portion, a space recessed inward of the fuel tank 30 is formed below the outer surface side of the tapered portion (indicated by a two-dot chain line in FIG. A space having a triangular cross section) is formed. In the present embodiment, this space is configured as a space for disposing the hydraulic oil pipe 61 (shown in FIG. 4 ), and this can prevent this space from becoming a dead space, and thus the space around the fuel tank 30. Can be effectively used. The inclination angle of the tapered portion is set to an angle (for example, 31 degrees) slightly larger than the allowable inclination angle (for example, 30 degrees) of the power shovel 10 in the left-right direction.

As shown in FIG. 8, a reinforcing plate 71 for reinforcing the rear sleeve plate portion 31c is welded to the rear sleeve plate portion 31c of the first panel 31, and two mounting plates are attached to the reinforcing plate 71. Brackets 73 and 74 are welded. Similarly, as shown in FIG. 9, a reinforcing plate 72 for reinforcing the front sleeve plate portion 31b is welded to the front sleeve plate portion 31b of the first panel 31, and one reinforcing plate 72 is attached to the reinforcing plate 72. The mounting bracket 75 is welded. The mounting brackets 73 to 75 are for mounting and fixing the fuel tank 30 in the engine compartment 19, and the fuel tank 30 is fixed to the vehicle side through these mounting brackets 73 to 75. Specifically, each of the mounting brackets 73 to 75 is provided with a bolt insertion hole 77 (illustrated in FIG. 6 ), and the mounting bracket 73 is inserted by the bolt (not shown) inserted into the bolt insertion hole 77. .About.75 are fastened and fixed to supporting members 81, 82 (shown in FIGS. 4 and 7) on the vehicle side.

As shown in FIG. 9, the reinforcing plate 72 is formed in a shape in which the corner 72a at the upper left end in the drawing extends to near the left edge in the drawing of the front sleeve plate portion 31b of the first panel 31. However, this is intended to: That is, as can be seen in FIG. 13 showing the cross-sectional state of this portion, the fourth region portion 32d of the second panel 32 is disposed vertically to the front sleeve plate portion 31b on the inner surface side of the front sleeve plate portion 31b. Although fillet welding is performed (the welding position is the corner L1 in the figure), the corner 72a of the reinforcing plate 72 is located at a position facing the end surface portion 36 of the fourth region 32d with the front sleeve plate portion 31b interposed therebetween. They are arranged and fillet welded (welding position is corner L2 in the figure). By welding the corner portion 72a of the reinforcing plate 72 to the position facing the end face portion 36 of the fourth region portion 32d with the front sleeve plate portion 31b interposed therebetween, stress concentration on the corner portion 72a is prevented. It is possible to prevent it. The corner portions 71a and 71b (illustrated in FIG. 8) of the reinforcing plate 71 are also the same in that they are welded at positions facing the end surface portion of the fourth region portion 32d with the front sleeve plate portion 31b interposed therebetween. The effect of is obtained.

Although separated from the present embodiment, as a method of joining the front sleeve plate portion 31b of the first panel 31 and the fourth region portion 32d of the second panel 32, as shown in FIG. It is also conceivable that the front sleeve plate portion 31b is vertically fillet-welded to the inner surface side of the portion 32d (the welding position is the corner portion M1 in the drawing). In this aspect, when the corner portion 72a of the reinforcing plate 72 is brought close to the fourth region portion 32d of the second panel 32 and fillet welded (the welding position is the corner portion M2 in the drawing), the corner on the second panel 32 side is formed. Since the welded portion of the portion M1 and the welded portion of the corner portion M2 on the reinforcing plate 72 side overlap with each other, poor welding is likely to occur. Further, the shear stress generated in the welded portion on the reinforcing plate 72 side is received by the welded portion on the second panel 32 side, which is also disadvantageous in terms of strength. In the present embodiment, since the structure shown in FIG. 13 is used, such a problem does not occur.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the fifth region 32e of the second panel 32 is formed as a tapered portion, but the panel base 31a, the front sleeve plate 31b, and the rear sleeve plate 31c of the first panel 31 are formed. You may form a taper part in a lower part. Further, in the above-described embodiment, the space formed below the outer surface of the tapered portion is used as the space for disposing the hydraulic oil pipe 61, but this space is configured as the space for disposing other members such as the fuel hose and the electric wire. You may. Further, in the above-described embodiment, the pedestal plate that supports the handrail member is formed separately from the pedestal receiving portion, but the pedestal plate and the pedestal receiving portion are integrally formed, and this is configured as the pedestal portion. May be. Further, in the above-described embodiment, the case where the present invention is applied to a power shovel has been described, but the present invention is also applicable to work vehicles other than the power shovel, for example, other work vehicles such as a shovel loader and a bulldozer. It is possible to obtain the same effect by applying to.

10 Power Shovel 11 Lower Traveling Body 12 Upper Revolving Body 19 Engine Room 30 Fuel Tank 31 First Panel 32 Second Panel 32e Fifth Area Part (Tapered Part)
33, 34 Pedestal receiving portion 43 Fuel discharge pipe 43a Suction port 50 Handrail member 52 Pedestal plate 71, 72 Reinforcement plate EG engine

Claims (4)

A fuel tank structure for a working vehicle, comprising: a fuel tank for storing fuel supplied to an engine; and a hydraulic oil tank for storing hydraulic oil supplied to and discharged from a hydraulic actuator,
The fuel tank is
A plate-shaped first side surface portion formed of a steel plate bent laterally at a plurality of positions and divided at the bending position as a boundary, a second side surface portion connected to the first side surface portion, and the second side surface portion. A first panel having a third side surface portion connected to the side surface portion of
The plate-shaped upper surface portion is formed by another steel plate that is bent at a plurality of positions in the vertical direction, and is divided at the bending position as a boundary, a fourth side surface portion that is connected to the upper surface portion, and a fourth side surface portion. A second panel having a bottom portion connected to the second panel,
In a state where both panels are combined so that the end surface of the peripheral edge portion of the second panel contacts the inner surface of the first panel, the peripheral edge portion of the second panel is welded and bonded to the inner surface of the first panel, It is configured as a closed rectangular parallelepiped,
It is fixed to the body frame member via a mounting member,
The fourth side surface portion is welded and joined to the inner surface of the third side surface portion in a state of being perpendicular to the third side surface portion on the inner surface side of the third side surface portion,
A reinforcing plate is welded and joined to the third side surface portion on the outer surface side of the third side surface portion in a state where the reinforcing plate is superposed on the third side surface portion,
The corner portion of the reinforcing plate and the end surface portion of the fourth side surface portion are arranged at positions facing each other with the third side surface portion sandwiched therebetween, and welded to the third side surface portion, respectively. Cage,
The fourth side surface portion has a taper portion on the lower end side of the fourth side surface portion that is inclined inward and downward of the fuel tank,
A work characterized in that a space that is formed below the outer surface of the tapered portion and that is recessed inward of the fuel tank is configured as an arrangement space for a hydraulic oil pipe that constitutes a supply/discharge path for the hydraulic oil. Vehicle fuel tank structure. The mounting member is welded to the reinforcing plate, has a bolt insertion hole, and is fastened and fixed to the vehicle body frame member by a bolt inserted in the bolt insertion hole. The fuel tank structure of the working vehicle described in. The vehicle body frame members are respectively installed on both sides of the space of the fuel tank,
The fuel tank structure for a working vehicle according to claim 1 or 2, wherein the hydraulic oil pipe is installed so as to pass through the body frame members on both sides and pass through the space. The two corners on the upper end side in the bent position of the first panel extend above the position of the upper surface of the fuel tank, and are formed as pedestals to which the handrail member is fixed. The fuel tank structure for a working vehicle according to any one of 1 to 3.