JP2004189128A - Fuel tank for hydraulic excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel tank for a hydraulic excavator with an increase in capacity without loss of workability upon attachment/detachment of a working unit. <P>SOLUTION: A fuel tank body 18 is provided alongside a working unit supporting bracket 8a supporting the working unit attached to an upper revolving body 2. The front part of the tank body 18 is notched and formed into an almost stepped shape not to be an obstacle against the attachment/detachment of the working unit 10. Furthermore, a reinforcing member 25 is firmly fixed to the inside plate 18b of the tank body 18 to improve the surface rigidity of the plate 18b. Thus, the capacity of the tank body 18 can be increased without loss of workability along with the increase in the surface rigidity. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuel tank for a hydraulic shovel having an increased capacity without impairing the assemblability of a working machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a hydraulic excavator has a revolving upper revolving unit mounted on a self-propelled lower traveling unit, and a working machine is mounted on a front part of the upper revolving unit.
A driver's cab and a fuel tank are installed on both sides of the working machine, and an engine room containing a power engine, a counterweight, and the like are installed behind the upper swing body.
On the other hand, as oil storage tanks installed on an upper swing body of a hydraulic excavator, for example, those described in Patent Documents 1 and 2 are known.
[0003]
[Patent Document 1]
JP-A-3-24921 (Claim 1)
[Patent Document 2]
JP-A-6-79850 (Claim 1)
[0004]
The oil storage tank of the hydraulic shovel described in Patent Document 1 has, among the six surfaces of the oil storage tank formed in a hexahedral shape, an outer surface having a convex curved shape, and a curved surface whose upper surface is continuous with the outer surface. It has a corner portion and a flat portion, and has an effect such that the strength of the oil storage tank can be increased by forming a curved surface from the outer surface to the upper surface.
On the other hand, the oil storage tank of the hydraulic shovel described in Patent Document 2 is configured to increase the strength of the oil storage tank by forming a large number of irregularities on the surface of the oil storage tank formed into a box shape by a metal plate. I have.
[0005]
[Problems to be solved by the invention]
However, in the oil storage tanks described in Patent Documents 1 and 2, the strength of the upper surface, the outer surface, and both side surfaces can be increased, but the strength of the inner plate facing the work machine cannot be increased.
Especially in the case of hydraulic excavators used in areas where vehicle width direction is strictly regulated when transporting by land, such as in Europe, it is necessary to reduce the overall width of the vehicle body. In order to install the fuel tank on the side of the vehicle, the length of the fuel tank in the front-rear direction must be shortened, and the length in the vehicle width direction must also be shortened for vehicle width regulation. There is a problem.
[0006]
The present invention has been made in order to improve such a problem, and it is an object of the present invention to provide a fuel tank of a hydraulic shovel whose capacity is increased without impairing workability when attaching and detaching a work machine. is there.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a fuel tank of a hydraulic shovel according to the present invention is provided on a self-propelled lower traveling body, on which an upper revolving body on which a working machine is detachably mounted is pivotably provided, and supports the working machine. A hydraulic tank for a hydraulic shovel with a fuel tank body installed on the side of the work equipment support bracket.The front part of the fuel tank body is cut out so as not to hinder the attachment and detachment of the work equipment. The reinforcing member is fixed to the inner plate of the fuel tank main body to improve the surface rigidity of the inner plate.
[0008]
With the above configuration, the capacity of the fuel tank can be increased without increasing the entire width of the body of the hydraulic shovel. The capacity of the work machine can be increased, and the fuel tank does not hinder the work when the work machine is attached or detached, so that the work machine can be easily assembled or removed for maintenance.
In addition, since the reinforcing member is fixed to the inner plate of the fuel tank body to improve the surface rigidity of the inner plate, the entire fuel tank body can be manufactured from a plate material having the same thickness. Since the production is easy, the cost can be reduced.
[0009]
In order to achieve the above object, the fuel tank of the hydraulic shovel of the present invention is configured such that at least one reinforcing member is obliquely fixed to the inner surface of the inner plate so as to gradually lower from the rear side to the front side of the fuel tank body. The surface rigidity of the inner plate is improved.
[0010]
According to the above configuration, the inner plate of the fuel tank main body can be reinforced with a small number of parts, which is economical.
[0011]
In order to achieve the above object, a fuel tank of a hydraulic shovel according to the present invention has a surface rigidity of an inner plate improved by fixing a plurality of reinforcing members to an inner surface of the inner plate.
[0012]
According to the above configuration, the restriction on the mounting direction of the reinforcing member is reduced, so that the degree of freedom in designing the fuel tank body is improved.
[0013]
In order to achieve the above object, a fuel tank of a hydraulic shovel according to the present invention is provided on a self-propelled lower traveling body, on which an upper revolving body on which a working machine is detachably mounted is pivotably provided, and supports the working machine. A fuel tank for a hydraulic shovel, in which a fuel tank body in which an upper surface plate and an outer plate are connected by a curved corner portion and an inner plate is formed by a flat plate is provided on a side of the work machine support bracket, The front part of the fuel tank main body is cut out in a substantially L-shape so as not to hinder the insertion and removal of the shaft pin for pivotally connecting the work implement support bracket, and the front part of the fuel tank main body is formed substantially stepwise, and By attaching at least one reinforcing member obliquely to the inner surface of the inner plate where the large-area flat part and the small-area flat part are connected back and forth, over the large-area flat part and the small-area flat part, Inside Those with increased surface rigidity.
[0014]
With the above configuration, the capacity of the fuel tank can be increased without increasing the entire width of the body of the hydraulic shovel. And the fuel tank does not interfere with the work when inserting and removing the shaft pin for attaching and detaching the work machine, making it easy to assemble the work machine and remove it for maintenance. Can be done.
In addition, since the reinforcing member is fixed to the inner plate of the fuel tank body to improve the surface rigidity of the inner plate, the entire fuel tank body can be manufactured from a plate material having the same thickness. Since the manufacturing is easy, the cost can be reduced, and the bonnet cover can be opened and closed by using the stepped portion of the fuel tank body when performing maintenance or the like, so that the maintenance or the like can be easily performed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
1 is an overall side view of a hydraulic excavator, FIG. 2 is a perspective view of an upper swing body, FIG. 3 is a perspective view of a fuel tank, FIG. 4 is a front view of an inner surface of the fuel tank, and FIG. It is sectional drawing which follows the -A line.
[0016]
The hydraulic excavator shown in FIG. 1 includes a lower traveling body 1 that is free to travel, and an upper revolving body 2 that is rotatably mounted on the lower traveling body 1.
The undercarriage 1 has a track frame 3 composed of a center frame 3a and a pair of side frames 3b provided on both sides of the center frame 3a, and an idler 4 is provided at one end of each side frame 3b. A sprocket 5 which is supported so as to be able to move back and forth freely and is rotatably driven by a traveling motor (not shown) composed of a hydraulic motor is provided on the other end side.
An endless crawler belt 6 is wound between the idler 4 and the sprocket 5, and by driving the crawler belt 6 with the sprocket 5, the lower traveling body 1 can run on its own and a side track is provided. A plurality of rolling wheels 7 are rotatably supported on the upper and lower portions of 3b.
[0017]
Further, the upper revolving unit 2 rotatably mounted on the center frame 3a of the truck frame 3 is constituted by a body frame 8 as shown in FIG.
At the center of the front part of the body frame 8, there is provided a pair of work implement support brackets 8a projecting upward in a substantially mountain shape, and a boom that constitutes the work implement 10 in a pin hole 8b drilled on the upper side. A shaft pin (not shown) that supports the lower end of the boom 11 is inserted from the side of the work implement support bracket 8a, and the base end of the boom cylinder 12 that raises and lowers the boom 11 is inserted into a pin hole 8c formed in the lower side. A shaft pin (not shown) to be supported is inserted from the side of the work machine support bracket 8a.
As shown in FIG. 1, the working machine 10 has a base end pivotally attached to a work implement support bracket 8 a and a boom 11 which can be raised and lowered by a boom cylinder 12, a base end side pivotally attached to a distal end of the boom 11, and an arm. An arm 14 is rotatable by a cylinder 13, and a bucket 16 is pivotally attached to the tip of the arm 14 and is rotatable by a bucket cylinder 15.
[0018]
On the other hand, a driver's cab 17 is installed on one side of the work implement support bracket 8a at the front of the body frame 8, and a fuel tank body 18 is installed on the other side. An engine room 21 covered by a hood cover 20 is installed, and a power engine (not shown) is accommodated in the engine room 21. A counterweight 22 is attached to the rear end of the body frame 10. ing.
[0019]
As shown in FIG. 2, the fuel tank main body 18 installed on the side of the working machine support bracket 8a is used for assembling the working machine 10 or removing the same for maintenance. A pin hole 8b formed in the upper part of the machine support bracket 8a has a structure in which the side of the pin hole 8b is cut out stepwise.
FIG. 3 is an enlarged perspective view of the fuel tank main body 18, in which an outer plate 18a which is on the outside with respect to the turning direction, an inner plate 18b which is on the inside, an upper plate 18c which forms the upper surface, and a bottom plate which is formed. And the front and rear side plates 18e and 18f forming the front and rear surfaces.
Each of the plates 18a to 18f is made of, for example, a metal plate having the same thickness. The outer plate 18a and the upper plate 18b are connected to each other by a curved corner portion 18g, and the front edges of the outer plate 18a and the inner plate 18b. Are bent substantially stepwise along the front edges of the inner and outer plates 18b and 18a, which have been cut into substantially L-shapes, and the edges of each piece are formed by the inner and outer plates 18b and 18a, the upper plate 18c, and the bottom plate 18d. Welded to the edge.
[0020]
The rear side plate 18f is formed of a flat plate, four sides of which are welded to the inner and outer plates 18b, 18a and the respective edges of the top plate 18c and the bottom plate 18d. The fuel supply port 23 is protruded, and the opening of the fuel supply port 23 is closed by a removable cap 24.
As shown in FIG. 4, a reinforcing member 25 is provided diagonally on the inner plate 18b of the fuel tank body 18.
As shown in FIG. 5, the reinforcing member 25 is formed of a metal channel material having a U-shaped cross section, for example, and is fixed to the inner surface of the inner plate 18b by welding or the like as follows.
[0021]
That is, as shown in FIG. 4, the inner plate 18b whose front edge has been cut out in a substantially L-shape has the same shape because the flat plate portion 18i having a small area and the flat plate portion 18h having a wide area are continuous back and forth. In this case, the strength of the flat area 18h having a large area is lower than that of the flat area 18i having a small area.
Therefore, the reinforcing member 24 is obliquely fixed to the flat plate portion 18h having a large area to reinforce the flat plate portion 18h. However, when the flat plate portions 18h and 18i having different strengths are continuous in a plane, the strength changes. Since the stress is concentrated on the portion indicated by the arrow B, the strength of this portion is reduced most.
[0022]
In order to prevent this, one end of the reinforcing member 24 provided obliquely on the flat plate portion 18h having a large area is extended to the flat plate portion 18i having a small area to disperse the stress concentrated on the portion indicated by the arrow B, and at the same time to reduce the area. The narrow flat plate portion 18i is reinforced.
As a result, the surface rigidity of the entire inner plate 18b can be increased, and stress can be prevented from being concentrated at each welded portion, particularly at the portion indicated by the arrow B in FIG.
The reinforcing members 24 may be formed of a plurality of members and provided separately on each of the flat plate portions 18h and 18i, or each reinforcing member 24 may be provided in a horizontal direction to reinforce the flat plate portions 18h and 18i. Of course, it is good.
[0023]
Next, the operation of the fuel tank configured as described above will be described. When assembling the hydraulic excavator, the operator's cab 17 and the fuel tank body 18 are installed on the upper revolving unit 2 before the work machine 10 is mounted on the upper revolving unit 2. .
For this reason, when the base end of the boom 11 constituting the working machine 10 is pivotally connected to the working machine support bracket 8a by the shaft pin, the front portion of the fuel tank body 18 is previously set so as not to hinder the assembly. It has been cut out.
Thereby, the assembling work of the working machine 10 can be easily performed, and the capacity of the lower portion of the fuel tank body 18 protruding forward is increased, so that the capacity of the fuel tank can be increased.
[0024]
Further, in the conventional fuel tank, the inner and outer plates 18b and 18a, the front and rear plates 18e and 18f, and the upper plates 18c and 18d are formed of the same plate material for the purpose of facilitating manufacture and reducing costs. Although the rigidity of the inner plate 18b having a large flat plate portion is insufficient, by reinforcing the inner plate 18b with the reinforcing member 25 as described above, surface rigidity equal to or higher than that of other parts can be obtained, and the fuel tank body By employing a staircase structure in which the lower side of 18 protrudes forward, the capacity of the fuel tank main body 18 can be increased without hindering assembly and disassembly of the working machine 10.
[0025]
By making the front part of the fuel tank body 18 step-shaped, it may be used as a step when opening and closing the bonnet cover 20 covering the engine room 21. It is even better to attach a step plate that also serves as a non-slip.
[0026]
【The invention's effect】
As described in detail above, the present invention is configured such that a front portion of a fuel tank main body installed on a side of a work machine support bracket for supporting a work machine is cut out so as not to hinder the attachment and detachment of the work machine. Since the surface rigidity of the inner plate has been improved by forming it in a substantially stepped shape and attaching a reinforcing member to the inner plate of the fuel tank body, the capacity of the fuel tank can be increased without expanding the entire width of the hydraulic excavator body. Because it can be enlarged, even for hydraulic excavators exported to Europe, etc., where vehicle width restrictions during transportation are severe, the capacity of the fuel tank can be increased and the fuel tank must be Since there is no obstruction, assembly work of the working machine and removal work for maintenance can be easily performed.
[0027]
In addition, since the reinforcing member is fixed to the inner plate of the fuel tank body and the surface rigidity of the inner plate is improved, the entire fuel tank body can be manufactured from a plate material having the same thickness. Since the manufacture is easy, the cost can be reduced, and at least one reinforcing member is obliquely fixed to the inner surface of the inner plate so as to be gradually lower from the rear side to the front side of the fuel tank body. Since the surface rigidity of the plate is improved, the inner plate of the fuel tank body can be reinforced with a small number of parts, which is economical.
Further, since the surface rigidity of the inner plate is improved by fixing a plurality of reinforcing members to the inner surface of the inner plate, the restriction on the mounting direction of the reinforcing member is reduced, so that the design of the fuel tank body is reduced. The degree of freedom is improved.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic shovel equipped with a fuel tank according to an embodiment of the present invention.
FIG. 2 is a perspective view of an upper revolving structure portion of the hydraulic shovel on which the fuel tank according to the embodiment of the present invention is mounted.
FIG. 3 is a perspective view showing a fuel tank of the hydraulic shovel according to the embodiment of the present invention.
FIG. 4 is a front view showing an inner surface of a fuel tank of the hydraulic shovel according to the embodiment of the present invention.
FIG. 5 is a sectional view taken along line AA of FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving structure 8 Work implement support bracket 10 Work implement 18 Fuel tank main body 18a Outer plate 18b Inner plate 18c Upper plate 18g Corner 18h Flat plate 18i Flat plate 25 Reinforcement member

Claims (4)

An oil pressure apparatus having a revolving upper revolving structure on which a work machine is detachably mounted on a self-propelled lower traveling body, and a fuel tank main body installed on a side of a work machine support bracket supporting the work machine. A fuel tank of the shovel, wherein a front portion of the fuel tank main body is formed in a substantially stepped shape by notching so as not to hinder attachment and detachment of the work machine, and is provided on an inner plate of the fuel tank main body. A fuel tank for a hydraulic shovel, wherein a reinforcing member is fixed to improve the surface rigidity of the inner plate. The surface rigidity of the inner plate is improved by obliquely attaching at least one reinforcing member to the inner surface of the inner plate so as to be gradually lower from the rear side to the front side of the fuel tank body. 2. The fuel tank of the hydraulic shovel according to 1. 2. The fuel tank for a hydraulic shovel according to claim 1, wherein a plurality of reinforcing members are fixed to an inner surface of the inner plate to improve surface rigidity of the inner plate. 3. On a self-propelled lower traveling body, an upper revolving body on which a work machine is detachably mounted is provided so as to be freely rotatable, and an upper surface plate and an outer plate are provided beside the work machine support bracket supporting the work machine. Is a fuel tank of a hydraulic shovel in which a fuel tank main body is connected by a curved corner portion and an inner plate is formed of a flat plate, and a shaft pin for pivotally connecting the work machine and the work machine support bracket is inserted. The front part of the fuel tank main body is cut out in a substantially L-shape so as not to hinder detachment, the front part of the fuel tank main body is formed in a substantially stepped shape, and a flat plate part having a wide area and a flat part having a narrow area are formed. By attaching at least one reinforcing member obliquely to the inner surface of the inner plate connected to the front and rear, the flat plate having the large area and the flat plate having the small area, the surface rigidity of the inner plate is improved. Was it Fuel tank of a hydraulic excavator, wherein.

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