JP2007022399A - Tank for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently effectively increasing strength of a tank mounted on a construction machine, to suppress cost increase by reducing welding of a rib as much as possible and to enhance reliability. <P>SOLUTION: Recession parts 12a, 13a, 14a are continuously formed from an upper end to a lower end on three side surfaces of the tank 11 mounted on the construction machine respectively and the rib 16a is welded to an inner wall of a remaining side surface 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tank for a construction machine, and more particularly to a tank structure for increasing strength.

  Conventionally, a construction machine such as a hydraulic excavator is mounted with a fuel tank for storing fuel and a hydraulic oil tank for storing hydraulic oil. The tank of this kind of construction machine is formed of a metal plate in a substantially rectangular parallelepiped shape, and a partition plate is provided inside the tank to increase the strength of the tank, and the fuel and hydraulic oil stored in the tank are transferred to the construction machine. It is configured to prevent a large movement due to vibration or impact, and to be supplied satisfactorily to the engine or hydraulic equipment.

  For example, it is a box-shaped tank structure, and the rough cutting plate of the partition plate is formed into a polygon with a larger area than the space portion shape at the partition plate mounting position inside the outer plate, and the corners around the outside of the polygon Cut the corner into a chamfered shape of a straight line or a circular arc curve with a large radius of curvature, and make the plate surface portion of the outer periphery of the polygon excluding the chamfered sides contact the inner peripheral surface portion of the outer plate. In order to fix, what bent the said outer periphery part is known (refer patent document 1).

  Further, the peripheral edge portion of the partition plate is bent to form a concave portion or a convex portion at the bent portion, and a convex portion or a concave portion for engaging the concave portion or the convex portion of the partition plate is formed on the tank peripheral wall. And the tank structure which fixed the middle partition plate to the tank peripheral wall by engaging the said recessed part or convex part provided in the partition plate with the convex part or recessed part of the tank peripheral wall is known (refer patent document 2). .

As shown in FIG. 3, in the configuration in which the partition plate is not provided inside the tank 1, the strength can be increased by fixing the appropriately sized rib 2 to the inner wall surface by welding. Or as shown in FIG. 4, the structure which provides the recessed part or the convex part 3 in the outer wall surface of the tank 1, and aims at an increase in intensity | strength is also considered.
JP-A-8-192648 JP-A-9-263148

  In the invention described in Patent Document 1, the partition plate is formed into a polygonal shape, and the corner corner portion is cut into a chamfered shape, so that the bending angle portion of the outer peripheral portion of the partition plate is cracked corresponding to the load acting on the tank. Is prevented from occurring. However, although it can contribute to maintaining the strength of the partition plate, the strength of the tank body is not different from the previous one. Moreover, it cannot respond to the tank structure without a partition plate.

  The invention described in Patent Document 2 is provided with a concave portion or a convex portion in the bent portion of the partition plate and the tank peripheral wall so as to be engageable. Therefore, the intermediate partition plate can be fixed simply by being pushed into the tank peripheral wall. Do not produce thin-walled parts. However, similarly to the invention described in Patent Document 1, it cannot cope with a tank structure without a partition plate.

  Although the structure shown in FIG. 3 can also be applied to a tank structure without a partition plate, the welding of the ribs is expensive, and problems such as a decrease in strength and the occurrence of rust due to poor welding may occur. Further, the configuration shown in FIG. 4 can also correspond to a tank structure without a partition plate, but since the concave portion or the convex portion is provided only in the central portion of the outer wall surface, the increase in strength is not sufficient and the effect is small.

  Therefore, there is a technical problem to be solved to increase the strength of the tank mounted on the construction machine sufficiently effectively, reduce the welding of the ribs as much as possible to suppress the cost increase, and improve the reliability. Therefore, an object of the present invention is to solve this problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a tank mounted on a construction machine, wherein at least three surfaces of the tank are connected to one end of the surface from the other end. Provided is a tank for a construction machine, characterized in that a concave portion or a convex portion is formed continuously over the portion.

  According to this configuration, since at least three surfaces of the tank are continuously formed with recesses or projections from one end to the other end of the surface, a conventional configuration in which a recess or projection is provided only at the center of the surface. The strength of the surface is improved as compared with the configuration of the above, and therefore the strength of the entire tank is increased. If there is no welded portion of the rib, the cost increase is suppressed, and problems caused by poor welding are eliminated.

  According to a second aspect of the present invention, there is provided the construction machine tank according to the first aspect, wherein a rib is welded to one surface of the tank where the concave portion or the convex portion is not provided.

  According to this configuration, the rib is welded to one surface of the tank not provided with the concave portion or the convex portion to increase the strength of the surface, and the rib is welded more than the conventional configuration in which the rib is welded to a plurality of surfaces. The number is reduced.

  Invention of Claim 3 is a tank mounted in a construction machine, Comprising: The recessed part or the convex part was formed in the four surfaces of this tank continuously from the one end part of the surface to the other end part, respectively. Provide tanks for construction machinery.

  According to this configuration, since the concave portion or the convex portion is formed continuously from one end portion to the other end portion of the surface on the four surfaces of the tank, the strength of the surface is improved compared to the invention according to claim 1, The strength of the entire tank is further increased. Similarly to the first aspect of the present invention, if there are no welded portions of the ribs, the increase in cost is suppressed, and problems caused by poor welding are eliminated.

  In the present invention, as described above, since at least three or four surfaces of the tank are continuously formed with recesses or projections from one end to the other end of the surface, the strength of the surface is improved over the conventional type. Thus, the strength of the entire tank can be increased. Moreover, the cost increase can be suppressed by reducing or eliminating the number of locations where the rib is welded. Thus, the strength of the tank mounted on the construction machine can be increased sufficiently effectively, and the reliability can be improved.

  Hereinafter, the tank of the construction machine according to the present invention will be described with reference to preferred embodiments. The purpose of tanks mounted on construction machinery is to increase the strength of tanks mounted on construction machinery sufficiently effectively, reduce rib welding as much as possible to prevent cost increases, and improve reliability. This was realized by forming concave or convex portions on at least three surfaces of the tank continuously from one end portion to the other end portion of the surface.

  FIG. 1 shows a hexagonal cubic tank 11 as an example of a tank of a construction machine, (a) is a perspective view seen from one direction, (b) is a perspective view seen from the other direction, and (c) is formed integrally. FIG. The tank 11 includes a member 11A in which three side surfaces 12, 13, and 14 are integrally formed by bending a metal plate into a generally U shape in plan view, and an upper surface 15 and one side surface by bending the metal plate into a generally U shape in a front view. 16 and the member 11B in which the lower surface 17 is integrally formed are combined to form a cube by welding.

  The three side surfaces 12, 13, and 14 of the member 11A are each provided with a concave portion or a convex portion continuously from one end portion to the other end portion of the surface. In this embodiment, substantially central portions of the respective surfaces are extruded inward by press molding or the like, and reinforcing concave portions 12a, 13a, and 14a are formed continuously from the upper end portion to the lower end portion of the surface. On the other hand, an oil supply port 18 is provided in the upper surface 15 of the member 11B, and a drain pipe mounting hole 19 is opened in the lower surface 17. A reinforcing rib 16a is fixed to the inner wall of the side surface 16 of the member 11B by welding.

  As described above, in the tank 11 shown in FIG. 1, the recesses 12a, 13a, and 14a are continuously formed on the at least three side surfaces 12, 13, and 14 from the upper end to the lower end of the surface, respectively, and the recesses are provided. A rib 16a is welded to the inner wall on the remaining side surface. Therefore, the strength of the surface is improved as compared with the conventional tank in which the concave portion or the convex portion is provided only in the central portion of the surface, and the strength of the entire tank 11 can be increased. Also, compared to conventional tanks with ribs welded to multiple surfaces, there is only one surface with ribs welded, reducing the number of ribs welded, thereby reducing costs and causing poor welding. The trouble to do is solved.

  FIG. 2 shows a hexahedral cube tank 21 as another example of the tank of the construction machine, in which (a) is a perspective view seen from one direction, and (b) is a perspective view seen from the other direction. The tank 21 includes a member 21A in which three side surfaces 22, 23, and 24 are integrally formed by bending a metal plate into a substantially U shape in plan view, and an upper surface 25 and one side surface by bending the metal plate into a substantially U shape in front view. 26 and the member 21B in which the lower surface 27 is integrally formed are combined to form a cube by welding.

  The three side surfaces 22, 23, 24 of the member 21 </ b> A are each provided with a concave portion or a convex portion continuously from one end portion to the other end portion of the surface. In the present embodiment, substantially central portions of the respective surfaces are extruded inward by breath molding or the like, and reinforcing concave portions 22a, 23a, and 24a are formed continuously from the upper end portion to the lower end portion of the surface. On the other hand, an oil supply port 28 is provided on the upper surface 25 of the member 21B. Further, the side surface 26 of the member 21B is pushed outward from the substantially central portion of the surface by press molding or the like, and reinforcing convex ribs 26a are formed continuously from the left end portion to the right end portion of the surface.

  As described above, the tank 21 shown in FIG. 2 has recesses 22a, 23a, 24a formed continuously from the upper end portion to the lower end portion of the three side surfaces 22, 23, 24 among the four side surfaces, On the remaining one side surface 26, a convex portion 26a is formed continuously from the left end portion to the right end portion of the surface. Therefore, the strength of the surface is improved as compared with the conventional tank in which the concave portion or the convex portion is provided only at the central portion of the surface, and the strength of the entire tank 21 can be increased. Further, since there is no surface where the ribs are welded as compared to the conventional tank where the ribs are welded to a plurality of surfaces, the cost increase due to the welding of the ribs is suppressed, and the problems caused by poor welding are eliminated.

  Thus, the strength of the tank mounted on the construction machine can be increased sufficiently effectively, and the reliability can be improved.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Explanatory drawing of Example 2 which concerns on this invention. Explanatory drawing which shows an example of the past. Explanatory drawing which shows another example of the past.

Explanation of symbols

11 tank 11A member 11B member 12 side surface 12a concave portion 13 side surface 13a concave portion 14 side surface 14a concave portion 15 upper surface 16 side surface 16a rib 17 lower surface 21 tank 21A member 21B member 22 side surface 22a concave portion 23 side surface 23a concave portion 24 side surface 26a Part 27 bottom surface

Claims (3)

  A tank for a construction machine, wherein a recess or a projection is formed on at least three surfaces of the tank from one end to the other end of the surface.   The construction machine tank according to claim 1, wherein a rib is welded to one surface of the tank not provided with a concave portion or a convex portion. A tank for a construction machine, wherein a recess or a projection is formed continuously from one end of the surface to the other end on each of the four surfaces of the tank.

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