JPH08192648A - Tank structure for construction machine - Google Patents

Abstract

PURPOSE: To improve the service strength of a division laid in a tank by polygonally forming a roughly finished cutout plate for the division, cutting the corners of the plate linearly or in a chamfered state having a circular arc curve with a large radius of curvature, and bending the surface of the outer periphery of the polygonal plate except for the chamfered side. CONSTITUTION: Regarding a tank such as a fuel tank mounted on a construction machine, a roughly finished cut out plate 19 for a division 11 is made into a square form having a larger area than the shape of a gap at a division mounting position inside a box type outer plate 8, and the corners of the square periphery of the plate 19 are cut to a linearly chamfered form. The plate surface 17 of a square periphery 29 except for a chamfered side 16 are kept in a plane contact with the internal side of the outer 8. In addition, an outer periphery 20 is bent along a bending line 21. According to this construction, the plate surface 17 can be welded to the inner periphery of the outer plate 8 to form a tank 7, thereby preventing the occurrence of a crack at the angular section 18 of the division 11 at the time of mounting the tank 7 on a construction machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank structure such as a fuel tank mounted on a construction machine such as a hydraulic excavator or a working vehicle.

[0002]

2. Description of the Related Art FIG. 7 is a side view of a tank 1 described in Japanese Utility Model Publication No. 1-91624. As shown in FIG. 7, the tank 1 is mounted on the work vehicle 3 by tightening the band 2. FIG. 8 is a front view of the tank 4 described in Japanese Utility Model Laid-Open No. 5-22342. As shown in FIG. 8, the tank 4 is mounted on the construction vehicle 6 by tightening the band 5.

[0003]

As shown in FIGS. 7 and 8, there are construction machines and work vehicles in which a tank such as a fuel tank is mounted by band tightening. Since the outer plate of the tank is thin, a reinforcing partition plate (not shown) is provided inside the tank at the band tightening position in order to prevent the tank from being deformed by tightening. However, due to the impact and vibration of construction machines and work vehicles, cracks may occur in the partition plate and the band tightening may become loose. It is an object of the present invention to provide a tank structure that can solve the above problems.

[0004]

According to an embodiment of the present invention, an outer plate is formed of a thin plate in a box shape, and a reinforcing partition plate having oil circulation holes formed therein is fixedly installed in the outer plate to construct a construction machine. In a tank such as a fuel tank installed, the rough plate of the partition plate is formed into a polygon with an area larger than the space shape at the partition plate mounting position inside the box-shaped outer plate, and the outside of the polygon To cut the corners of the peripheral corner into straight chamfers and fix the plate surface of the polygonal outer peripheral part excluding the chamfered sides to the inner peripheral surface of the outer plate in surface contact and to fix it It was constructed by bending the part. Further, in another embodiment of the present invention, instead of cutting the corner corners of the rough plate of the partition plate around the polygon in the above embodiment into straight chamfers, the corners of the polygon have a large radius of curvature. The chamfered shape of an arc curve was cut.

[0005]

In the tank structure of the present invention, when the partition plate is manufactured, the plate surface portion of the outer peripheral portion excluding the chamfered side of the rough material plate is
When bending is performed at a bending line position at a bending radius of a small radius R, the bending angle portion extends to the chamfered side. However, in the present invention, since the chamfered side is formed as a straight line, the edge bending line near the bending angle portion of the chamfered side has a bending point at the small radius R of about 135 ° (a plate. The bending angle of the portion 17 is 90 °, and 45 ° of the side 16 cut in a chamfered shape is added). Therefore, the bent plate surface portion of the outer peripheral portion of the partition plate is fixed to the inner peripheral surface portion of the outer surface plate (welding when the thin plate is used for the outer surface plate) to form a tank, and the tank is constructed. When mounted on a machine, cracks will occur in the bending angle part of the plate surface part of the outer peripheral part of the partition plate in response to the load acting on the tank (meaning tank tightening pressure, shock, vibration, etc.). Can be prevented.

Further, in another embodiment of the tank structure of the present invention, the corners around the polygon of the rough plate of the partition plate have an arc curve with a large radius of curvature (not limited to an accurate arc curve, but a curve close to an arc). (Including a curved line).
As a result, when the partition plate is manufactured, when the plate surface portion of the outer peripheral portion excluding the chamfered side of the rough material cut plate is bent at a bend radius at a bending line position at a right angle, the chamfered side The edge bending line near the bending angle portion is a curved line which is close to a straight line with the bending point at the small radius R portion. Therefore, the bent plate surface portion of the outer peripheral portion of the partition plate is fixed to the inner peripheral surface portion of the outer surface plate to form a tank, and when the tank is mounted on a construction machine, it corresponds to the load acting on the tank. hand,
It is possible to prevent cracks from being generated in the bending angle portion of the plate surface portion on the outer peripheral portion of the partition plate. Since the chamfered side of the partition plate is an arc curve in the tank structure of the other embodiment described above, the opening area of the oil circulation hole formed by the side and the inner peripheral corner of the outer plate of the tank is set to be large. Therefore, it is possible to improve the distribution of fuel oil and the like contained in the tank.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a tank 7 having the tank structure of the present invention. In the figure, 7 is a tank such as a fuel tank which is formed in a box shape by pressure welding heating a thin steel plate and is mounted on a construction machine (not shown), 8 is an outer surface plate of the tank 7, and 9 is an end plate Reference numeral 10 denotes an oil filler port, and 11 denotes a reinforcing partition plate fixedly provided inside the tank 7. The partition plate 11 is welded to an inner position of the outer plate 8 corresponding to a band tightening (not shown) position of the tank 7 when the tank 7 is mounted on a construction machine. Figure 2
FIG. 3 is a front view of the partition plate 11. In the figure, reference numeral 8 indicated by an imaginary line is an outer surface plate of the tank 7, and 12, 13 are partition plates 1.
1, an oil circulation hole opened at 1, 14 and 15 are diaphragm reinforcing portions formed by press working, 16 is a partition plate 11 having a square shape in a front view.
The chamfered sides of the corner corners of 17 are the bent plate surface parts of the outer peripheral part of the partition plate 11. FIG. 3 is a view of the partition plate 11 in FIG. 2 viewed from A. In the figure, 18 is a bending angle portion of the plate surface portion 17, and R is a small radius on the inner surface side of the bending angle portion 18. FIG. 4 is a perspective view of an essential part of a B part in FIG. FIG. 5 is a view of the rough material cutting plate 19 of the partition plate 11 (so-called rough material development view of the partition plate 11). In the figure, 2
Reference numeral 0 is an outer peripheral portion of the rough material cutting plate 19, and reference numeral 21 (indicated by a broken line) is a bending line position forming the bending angle portion 18 in FIGS. 3 and 4.

Next, the tank structure of the present invention will be described with reference to FIGS. In the tank structure of the present invention, the rough material cutting plate 19 of the partition plate 11 is formed into a space portion shape inside the box-shaped outer surface plate 8 at the partition plate mounting position (inner space portion of the outer surface plate 8 indicated by a virtual line in FIG. 2). In addition, the inner peripheral corner portion is round, but a quadrangle having an area larger than the height direction dimension h and the width dimension w) (the height direction dimension shown in FIG. 5 is H [here And H> h] and the width is W [where W>
w] quadrangle), and the corner portions around the quadrangle are cut into straight chamfers, and the chamfered sides 16
The outer peripheral portion 20 was bent at the bending line position 21 in order to weld the plate surface portion 17 of the outer peripheral portion 20 of the quadrangle except for the surface contact with the inner surface portion of the outer surface plate 8 for welding.

Next, the operation of the tank structure of the present invention will be described. In the present invention, when the partition plate 11 is manufactured, the plate surface portion 17 of the outer peripheral portion 20 excluding the chamfered side 16 of the rough material cutting plate 19 is bent at a bending line position 21 (FIG.
(Shown in Fig. 1), the bending angle part 1
8 (shown in FIGS. 3 and 4) also extends to the chamfered edge 16. However, in the present invention, since the chamfered side 16 is formed in a straight line, the bending angle portion 1 of the chamfered side 16 is formed.
The edge bending line 22 (shown in FIG. 4) near 8 is approximately 135 ° (the bending angle of the plate portion 90 is 90 °) with the small radius R as a bending point (a portion indicated by reference numeral a in FIG. 4). To form a large angle α of 45 ° of the side 16 that has been cut. Therefore, when the bent plate surface portion 17 of the partition plate 11 is welded to the inner peripheral surface portion of the outer surface plate 8 to form the tank 7 and the tank 7 is mounted on a construction machine, a load acting on the tank 7 ( (Tank tightening pressure, shock, vibration, etc.)
Corresponding to the above, it is possible to prevent the occurrence of cracks in the bending angle portion 18 of the partition plate 11.

Next, FIG. 6 is a front view of the partition plate 23 used in the tank structure of another embodiment of the present invention. In the figure, reference numeral 24 indicated by an imaginary line is a rough material cutting plate of the partition plate 23,
12 'and 13' are oil circulation holes opened in the partition plate 1
4'and 15 'are drawn reinforcements formed by press working,
25 is the corner side of the partition plate 23 having a square shape when viewed from the front, 2
Reference numeral 6 denotes a bent plate surface portion of the outer peripheral portion 27 of the partition plate 23. Next, the tank structure of another embodiment and its operation will be described with reference to FIG. The difference between the tank structure of the other embodiment and the tank structure shown in FIGS.
The corners around the quadrangle 4 are cut into chamfers of an arc curve having a large radius of curvature (indicated by radius L) (including not only an accurate arc curve but also a curved curve close to an arc). . As a result, when the partition plate 23 is manufactured, the rough material cutting plate 2
Outer peripheral portion 2 excluding the chamfered side 4 (side indicated by reference numeral 25)
When the plate surface portion 26 of No. 7 is bent at a bending radius of a bending radius of a small radius R (same as the small radius R shown in FIG. 3) at a bending line position 28, the bending angle portion of the chamfered side 25 (see FIG. 4). An edge bending line (corresponding to the bending angle portion indicated by reference numeral 18) (corresponding to the edge bending line indicated by reference numeral 22 shown in FIG. 4) is a bay close to a straight line with the small radius R portion as a bending point. It becomes a curve. Therefore, the plate surface portion 26 of the partition plate 23 is welded to the inner peripheral surface portion of the outer surface plate (not shown but the same as the outer surface plate 8 of reference numeral 8 shown in FIG. 1), and the tank (not shown) is welded.
When the tank is mounted on a construction machine, cracks can be prevented from occurring at the bending angle portion of the plate surface portion 26 of the partition plate 23 in accordance with the load acting on the tank. In the tank structure of the other embodiment described above, the chamfered side 25 of the partition plate 23 is formed into an arc curve, and therefore the oil passage hole (the oil circulation hole formed by the side 25 and the inner peripheral corner of the outer surface plate (8) of the tank ( The opening area of the oil circulation hole (corresponding to symbol B shown in FIG. 2) is set to be large, so that the circulation of fuel oil or the like contained in the tank can be improved.

[0011]

In the tank structure of the present invention, the rough material cutting plate of the partition plate provided inside the tank is formed in a polygonal shape having an area larger than the space portion shape at the partition plate mounting position inside the box-shaped outer surface plate. , The corners of the outer periphery of the polygon are cut into straight lines or chamfers of circular arc curves with a large radius of curvature, and the plate surface of the outer periphery of the polygon excluding the sides of the chamfer is the inner circumference of the outer plate. The outer peripheral portion was bent so as to be in surface contact with and fixed to the surface portion. That is, when the partition plate is manufactured, the plate surface portion of the outer peripheral portion excluding the chamfered side of the rough material plate has a small radius R
Bending at a bending line position with a bending radius of
The bending angle portion extends to the chamfered side. In this case, in the embodiment in which the chamfered side is formed as a straight line, the edge bending line near the bending angle portion of the chamfered side has a bending point at the small radius R of about 135 ° (a plate. The angle of the chamfered side is added to the bending angle of the part) to form a large angle. In another embodiment in which the chamfered side is formed into an arc curve having a large radius of curvature, the edge bending line near the bending angle portion of the chamfered side is a straight line with the portion of the small radius R as the bending point. It becomes a curved line close to. Therefore, when the bent plate surface portion of the partition plate is fixed to the inner peripheral surface portion of the outer surface plate to form a tank and the tank is mounted on a construction machine, the partition plate corresponds to the load acting on the tank. It is possible to prevent the occurrence of cracks in the bending angle portion. Therefore, in the tank having the tank structure of the present invention, the durability strength of the partition plate can be increased and the durability maintenance performance of the tank can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a tank having a tank structure of the present invention.

FIG. 2 is a front view of a partition plate inside the tank in FIG.

3 is a view of the partition plate in FIG. 2 viewed from A. FIG.

FIG. 4 is a perspective view of an essential part of a B part in FIG.

5 is a rough material cutting board view of the partition board in FIG. 2. FIG.

FIG. 6 is a front view of a partition plate according to another embodiment of the present invention.

FIG. 7 is a side view showing a tank according to an embodiment of the prior art.

FIG. 8 is a front view showing a tank of another embodiment of the prior art.

[Explanation of symbols]

 1,4,7 Tanks 2,5 Bands 8 External plates 11,23 Partition plates 12,13 Oil distribution holes 16,25 (Chamfered) sides 17,26 Plate surface parts 18 Bending angle parts 19,24 Rough material cutting plates 20 , 27 Outer peripheral part 21, 28 Bending line position 22 Edge bending line

Claims (2)

[Claims] 1. A tank such as a fuel tank mounted on a construction machine, wherein the outer plate is formed into a box shape with a thin plate, and a reinforcing partition plate having oil passage holes formed therein is fixedly installed therein.
Form the rough plate of the partition plate into a polygon with an area larger than the space part shape at the partition plate mounting position inside the box-shaped outer plate, and make the corner corners around the polygon into a straight chamfered shape. A construction characterized by cutting and bending the outer peripheral portion in order to fix the plate surface portion of the outer peripheral portion of the polygon excluding the chamfered side by making surface contact with the inner peripheral surface portion of the outer plate Machine tank structure. 2. A tank such as a fuel tank mounted on a construction machine, wherein the outer plate is formed of a thin plate into a box shape, and a reinforcing partition plate having oil passage holes formed therein is fixedly provided therein.
The rough plate of the partition plate is formed into a polygon with an area larger than the space shape at the partition plate mounting position inside the box-shaped outer plate, and the corner corners around the polygon have a large radius of curvature. Cut into a chamfered shape of an arc curve, and bent the outer peripheral part in order to fix the plate surface part of the outer peripheral part of the polygon excluding the chamfered side to the inner peripheral surface part of the outer surface plate by surface contact A tank structure for construction machinery, which is characterized by that.