JP2005140305A - Tank structure of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tank structure of a construction machine enlarging a tank storage space in the tank structure provided with a cylinder body forming the sidewalls of a tank, a square upper plate for closing an upper end opening of the cylinder body, and a square lower plate for closing a lower end opening of the cylinder body. <P>SOLUTION: A first plate part 80a and a second plate part 80b facing each other are formed into the cylinder body 80, and the first plate part 80a is arranged parallel with respect to a first side end face 81a of the upper plate 81 and a first side end face 82a of the lower plate, and the second plate part 80b is arranged parallel with respect to a second side end face 81b of the upper plate 81 and a second side end face 82b of the lower plate 82. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tank structure capable of forming a fuel tank and a hydraulic oil tank provided in a construction machine.

  A construction machine, for example, a hydraulic excavator, stores an engine, a hydraulic pump driven by the engine, a plurality of hydraulic actuators driven by hydraulic oil discharged from the hydraulic pump, and hydraulic oil sucked up by the hydraulic pump, A hydraulic oil tank that collects return oil from a plurality of hydraulic actuators and a fuel tank that stores engine fuel are provided.

  In the hydraulic oil tank, the hydraulic oil in the tank may increase and the internal pressure may increase depending on the attitude of the front work machine. Accordingly, the hydraulic oil tank needs to have a strength that is difficult to be deformed even when an internal pressure is applied, and the hydraulic oil tank is formed of a metal plate in order to give this strength to the hydraulic tank.

  2. Description of the Related Art Conventionally, there is a hydraulic oil tank structure formed of a metal plate in which two members having a U-shaped cross section formed by bending a metal plate are butted so as to intersect each other. In this hydraulic oil tank structure, the number of parts can be small, but if the bending accuracy is low, a gap may be formed between the two members abutted, and the quality is difficult to stabilize.

Further, the conventional hydraulic oil tank structure has a cylindrical body that forms the side wall of the hydraulic oil tank, a rectangular shape that closes the opening at the upper end of the cylindrical body, for example, a square upper plate, and an opening at the lower end of the cylindrical body. There is a rectangular plate, for example, a square-shaped lower plate, and each of the four side end surfaces of the upper plate is arranged in parallel with each of the four side end surfaces of the lower plate. In this hydraulic oil tank structure, it is difficult to form a gap.
JP 2001-146765 A (FIGS. 3 to 5)

  In the structure of the conventional hydraulic oil tank described above, since the upper plate and the lower plate have a quadrangular shape, the space between the upper plate and the lower plate is a square columnar space, but the hydraulic oil storage space is a cylindrical body. Is formed into a columnar shape. Therefore, in the square columnar space sandwiched between the upper plate and the lower plate, a space portion that cannot be used as a storage space is formed around the cylindrical body, and there is a problem that a tank having a capacity that effectively uses the installation space cannot be realized. It was. Even in the fuel tank, the same problem occurs if the tank structure described above is employed.

  The present invention has been made in consideration of the above-mentioned circumstances, and the purpose thereof is a cylinder that forms a side wall of a tank, and a rectangular upper plate that closes an opening formed at the upper end of the cylinder, An object of the present invention is to provide a tank structure for a construction machine capable of enlarging a tank accommodating space in a tank structure including a rectangular lower plate for closing an opening formed at the lower end of the cylindrical body.

  In order to solve the above-described object, the present invention provides a cylindrical body that forms a side wall of a tank, a substantially rectangular upper plate that closes the opening at the upper end of the cylindrical body, and a substantially rectangular shape that closes the opening at the lower end of the cylindrical body. And a first side end surface and a second side end surface facing each other on the upper plate, and a first side end surface and a second side end surface facing each other on the lower plate are arranged in parallel. In the tank structure, opposing first flat plate portions and second flat plate portions are formed in the cylindrical body, and the first flat plate portions are formed on the first side end surface of the upper plate and the first side end surface of the lower plate. The second flat plate portion is arranged in parallel to the second side end surface of the upper plate and the second side end surface of the lower plate. In addition, although the shape of the upper plate and the lower plate is a substantially square shape, the substantially square shape is a shape in which a notch is formed on the upper plate or the lower plate having a square shape, a bent shape, It is meant to include those with rounded corners.

  In this invention comprised in this way, the 1st flat plate part and 2nd flat plate part which oppose are formed in a cylinder, and a 1st flat plate part is made into the 1st side end surface of an upper board, and the 1st side end surface of a lower board. It arrange | positions in parallel and arrange | positions a 2nd flat plate part in parallel with the 2nd side end surface of an upper board, and the 2nd side end surface of a lower board. Thereby, a larger accommodation space can be formed between the first flat plate portion and the second flat plate portion than when the cylindrical body is a cylindrical body. Therefore, the storage space of the tank can be increased.

  The present invention also provides an engine, a hydraulic pump driven by the engine, a working machine having a plurality of hydraulic actuators driven by hydraulic oil discharged from the hydraulic pump, and hydraulic oil sucked up by the hydraulic pump. A hydraulic oil tank that stores and collects return oil from the plurality of hydraulic actuators and a fuel tank that stores the fuel of the engine are applicable to the fuel tank and the hydraulic oil tank of a construction machine provided in a revolving structure. A tank structure of a construction machine, a cylinder forming a side wall of the tank, a substantially rectangular upper plate that closes the opening at the upper end of the cylinder, and a substantially rectangular lower plate that closes the opening at the lower end of the cylinder Each of a first side end surface and a second side end surface facing each other on the upper plate, and a first side end surface and a second side end surface facing each other on the lower plate. In the structure of a tank of a construction machine in which each is arranged in parallel, the first flat plate portion and the second flat plate portion facing each other are formed in the cylindrical body, and the first flat plate portion is formed on the first side of the upper plate. The end surface and the first side end surface of the lower plate are arranged in parallel, and the second flat plate portion is arranged in parallel to the second side end surface of the upper plate and the second side end surface of the lower plate. It is characterized by that.

  Further, the present invention provides a U-shaped member having a part of the first flat plate part and a part of the second flat plate part, a remaining part excluding the part of the first flat plate part, and the second The cylindrical body is formed by welding another U-shaped member having a remaining portion excluding the part of the flat plate portion by welding.

  In the present invention configured as described above, the cylindrical body can be easily formed because the cylindrical body is formed by the two U-shaped members joined together by the flat portions that are easily welded.

  According to the present invention, a larger accommodating space can be formed between the first flat plate portion and the second flat plate portion than in the case where the cylindrical body is a cylindrical body, so that the accommodating space of the tank can be increased. . As a result, a tank that uses the installation space more effectively than before can be realized.

  Hereinafter, an embodiment of a tank structure of a construction machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a hydraulic excavator including a hydraulic oil tank in which an embodiment of a tank structure of a construction machine according to the present invention is adopted, FIG. 2 is a perspective view showing the embodiment, and FIG. It is a top view which shows what remove | excluded the upper board from embodiment. In FIG. 2, the diagonally upper right side corresponds to the front side of the excavator shown in FIG. In FIG. 3, the right side corresponds to the front side of the excavator.

  The present embodiment is a structure of a hydraulic oil tank 8 provided in a construction machine, for example, a hydraulic excavator shown in FIG.

  The hydraulic excavator includes a traveling body 2 that travels by rotating a crawler belt by a traveling motor that is a hydraulic actuator, and a revolving body 1 that is installed on the traveling body 2. A driver's cab 3 is installed at the left front portion of the revolving structure 1. A front work machine 4 including a plurality of hydraulic actuators, that is, a boom, an arm, and a bucket driven by a hydraulic cylinder is provided at the center of the front portion of the revolving unit 1. A storage box 10 is provided at the right front portion of the swivel body 1. A machine room 5 in which an engine, a hydraulic pump, and the like are stored is provided from the center to the rear of the swivel body 1. A counterweight 6 is provided behind the machine room 5, that is, at the rear end of the swing body 1. Further, a fuel tank 9 for storing engine fuel is provided behind the storage box 10 of the revolving structure 1.

  Further, behind the fuel tank 9, there is provided a hydraulic oil tank 8 that stores hydraulic oil sucked up by the hydraulic pump and collects return oil from the travel motor and the hydraulic cylinder. That is, the hydraulic oil tank 8 is provided in a narrow installation space where the left side and the rear side are adjacent to the machine room 5 and the front side is adjacent to the fuel tank 9.

  This embodiment is employed in the hydraulic oil tank 8 provided in a narrow installation space as described above, and includes a cylindrical body 80 that forms the side wall of the hydraulic oil tank 8 as shown in FIGS. Further, in the present embodiment, the upper plate 81 is made of a rectangular metal plate having a square shape in plan view, for example, and closes the opening at the upper end of the cylindrical body 80, and the lower end of the cylindrical body 80 is made of a rectangular metal plate, for example, having a rectangular shape in plan view. And a lower plate 82 that closes the opening. The upper plate 81 and the lower plate 82 are joined to the cylinder 80 by welding.

  2 and 3, reference numerals 81 a and 81 b denote a first side end face and a second side end face facing each other on the upper plate 81, and are long sides in a rectangle which is a plan view shape of the upper plate 81. Reference numerals 81 c and 81 d denote another first side end face and another second side end face that face each other on the upper plate 81, and are short sides in a rectangle that is a planar view shape of the upper plate 81. Reference numerals 82a and 82b respectively denote a first side end surface and a second side end surface that face each other on the lower plate 82, and are long sides of a rectangle that is a planar view shape of the lower plate 82. Further, 82c and 82d are respectively a first side end surface and a second side end surface that face each other in the lower plate 82, and are short sides in a rectangle that is a planar view shape of the lower plate 82.

  Further, as shown in FIG. 3, the cylindrical body 80 is formed in a substantially rectangular shape having a round cross section at four corners. 2 and 3, reference numerals 80 a and 80 b denote a first flat plate portion and a first flat plate portion that are opposed to each other in the cylinder body 80, and are long sides in a substantially rectangular shape that is a cross-sectional shape of the cylinder body 80. Reference numerals 80 c and 80 b denote another first flat plate portion and another second flat plate portion that face each other in the cylinder body 80, and are short sides in a substantially rectangular shape that is a cross-sectional shape of the cylinder body 80.

  As shown in FIG. 2, the first flat plate portion 80 a and the first flat plate portion 80 b of the cylindrical body 80 include the first side end surface 81 a and the second side end surface 81 b of the upper plate 81 and the first side of the lower plate 82. It arrange | positions in parallel with respect to the end surface 82a and the 2nd side end surface 82b. In addition, another first flat plate portion 80c and another first flat plate portion 80d of the cylindrical body 80 are provided with another first side end surface 81c and another second side end surface 81d of the upper plate 81, and another lower plate 82. It arrange | positions in parallel with respect to the 1st side end surface 82c and another 2nd side end surface 82d.

  Further, as shown in FIG. 3, the cylindrical body 80 is formed by joining a U-shaped member 83 and another U-shaped member 84 by welding. The U-shaped member 83 is formed by bending a metal plate, and includes a part 83a of the first flat plate part 80a, a part 83b of the second flat plate part 80b, and another second flat plate part 80d. Have. Further, another U-shaped member 84 is formed by bending a metal plate, and a remaining portion 84a excluding a portion 83a of the first flat plate portion 80a and a portion 83b of the second flat plate portion 80b are formed. The removed remaining portion 84b and another first flat plate portion 80c are included.

  The U-shaped member 83 and the other second U-shaped member 84 are set to have the same shape and the same size, for example, and the bent portions 83c and 84c formed on each of the U-shaped member 83 and the second U-shaped member 84 have a radial dimension equal to or greater than the plate thickness dimension. It is formed to have an arc shape.

  In FIG. 3, reference numeral 85 denotes a portion 83 a of the first flat plate portion 80 a in the U-shaped member 83 and a remaining portion 84 a of the first flat plate portion 80 a in another U-shaped member 84 joined by welding. It is a weld. Reference numeral 86 designates a portion 83b of the second flat plate portion 80b in the U-shaped member 83 and a remaining portion 84b excluding a portion 83b of the second flat plate portion 80b in another U-shaped member 84 by welding. It is a combined weld. In FIG. 3, the end portions of the first flat plate portion 80a part 83a and the remaining portion 84a and the end portions of the second flat plate portion 80b and the remaining portion 84b are joined by butt welding. It is.

  Further, the upper plate 81 and the lower plate 82 have different first side end faces 81 c and 82 c arranged in the vicinity of the side wall of the swing body 1. And the cover 7 which comprises the side wall of the rotary body 1 is attached to these upper board 81 and lower board 82. As shown in FIG. Moreover, since the upper part of the cover 7 is curved toward the revolving unit 1 and the fastening part 7a provided at the upper part of the cover 7 protrudes toward the revolving body 1 rather than the fastening part 7b provided at the lower part of the cover 7, the upper plate The long side of the planar view shape 81 is set to a dimension shorter than that of the lower plate 82, and the other first side end surface 81 c of the upper plate 81 is revolving body 1 than the other first side end surface 82 c of the lower plate 82. It is arranged inside. The fastening portion 7a at the top of the cover 7 is fastened to both corners of the upper plate 81 on the first end surface 81c side with bolts and nuts. The fastening portion 7b at the bottom of the cover 7 is fastened to both corners of the lower plate 82 on the first end surface 82c side with bolts and nuts. That is, the upper plate 81 and the lower plate 82 not only block the upper and lower openings of the cylindrical body 80 but also function as attachment portions for attaching the cover 7.

  Further, the lower plate 82 is placed on the upper surfaces of the side beams 11a and 11b of the side frame 11 constituting the lower side of the revolving unit 1, and the four corners are fastened with bolts and nuts. That is, the lower plate 82 also functions as a support member that supports the hydraulic oil tank 8 on the side beams 11a and 11b.

  The present embodiment configured as described above has the following effects.

  In the present embodiment, the first flat plate portion 80a and the second flat plate portion 80b facing each other are formed in the cylindrical body 80, and the first flat plate portion 80a is formed on the first side end surface 81a of the upper plate 81 and the first side of the lower plate 82. The second flat plate portion 80b is arranged in parallel to the end surface 82a, and the second flat plate portion 80b is arranged in parallel to the second side end surface 81b of the upper plate 81 and the second side end surface of the lower plate 82. Thereby, a larger accommodating space can be formed between the first flat plate portion 80a and the second flat plate portion 80b than when the cylindrical body 80 is a cylindrical body. Therefore, the accommodation space of the hydraulic oil tank 8 can be increased. As a result, it is possible to realize the hydraulic oil tank 8 that uses the installation space more effectively than before.

  Further, another first flat plate portion 80c and another second flat plate portion 80d that face each other are formed in the cylindrical body 80, and the other first flat plate portion 80c is formed with another first side end surface 81c of the upper plate 81 and the lower plate. The second flat plate portion 80d is arranged in parallel to another second side end surface 82d of the upper plate 81 and another second side end surface 82d of the lower plate 82. Deploy. Thereby, also between the another 1st flat plate part 80c and another 2nd flat plate part 80d, a larger accommodation space can be formed rather than the case where a cylinder is a cylindrical body. Therefore, the accommodation space of the hydraulic oil tank 8 can be further increased.

  Further, in the present embodiment, the upper plate 81 and the lower plate 82 are disposed in the vicinity of the side wall of the revolving unit 1, and the cover 7 constituting the side wall is attached to the upper plate 81 and the lower plate 82. Thereby, the cover 7 can be attached without interposing a special member between the hydraulic oil tank 8 and the cover 7. As a result, the number of parts for attaching the cover 7 can be reduced.

  In the present embodiment, the lower plate 81 is attached to the side beams 11 a and 11 b of the side frame 11 that constitutes the lower side of the revolving unit 1. Thereby, the hydraulic oil tank 8 can be installed without interposing a special member between the hydraulic oil tank 8 and the side frame 11. As a result, the number of parts for installing the hydraulic oil tank 8 can be reduced.

  In the present embodiment, the U-shaped member 83 having a part 83a of the first flat plate portion 80a, a part 83b of the second flat plate portion 80b, and another second flat plate portion 80d of the cylindrical body 80, and the first The cylindrical portion 80 is formed by welding the remaining portion 84a of the flat plate portion 80a, the remaining portion 84b of the second flat plate portion 80b, and another U-shaped member 84 having another first flat plate portion 80c by welding. . That is, the cylindrical body 80 is formed by the two U-shaped members 83 and 84 that are joined together at flat portions that are easy to weld. Thereby, the cylinder 80 can be formed easily.

  In FIG. 3, like the welded portions 85 and 86, the end portion of the first flat plate portion 80a and the end portion of the remaining portion 84a, and the end portion and the remaining portion 84b of the second flat plate portion 80b of the portion 83b. However, the present invention is not limited to this, and the end portion of the first flat plate portion 80a part 83a and the remaining portion 84a are not limited to this, as in the welded portion 87 shown in FIG. The end and the end of the part 83b of the second flat plate portion 80b and the end of the remaining portion 84b may be overlapped and joined by fillet welding.

  In the present embodiment, the bent portion 83c of the U-shaped member 83 and the bent portion 84c of another U-shaped member 84 are formed in an arc shape having a radius dimension of about 15 to 25 times the plate thickness dimension. . As a result, the strength of the bent portions 83 c and 84 c of the cylindrical body 80 can be made difficult to be deformed with respect to the internal pressure of the hydraulic oil tank 8. As a result, it is possible to realize the hydraulic oil tank 8 that is not easily deformed with respect to the internal pressure.

  In this embodiment, the U-shaped member 83 and another U-shaped member 84 having the same shape and the same size are joined by welding to form the cylindrical body 80. However, the present invention is not limited to this. If the cylindrical body 80 having the above-described shape is formed, the cylindrical body 80 may be formed of a single member, or formed by joining two or more members having different shapes. May be.

  In the present embodiment, the cross-sectional shape of the cylindrical body 80 is substantially rectangular. However, the present invention is not limited to this, and any one of another first flat plate portion 80c and another second flat plate portion 80d. Or you may make both into an arc shape or the shape which has several bending parts.

  In the present embodiment, the planar view shape of the upper plate 81 and the lower plate 82 is a rectangle that is not square, but the present invention is not limited to this, and may be a square. However, the plan view shape of the upper plate 81 and the lower plate 82 is a square or a rectangle close to a square, and as described above, both the other first flat plate portion 80c and the other second flat plate portion 80d are attached to several places. When switching to a shape having a bent portion, it is not preferable to increase the bent portion. That is, if there are too many bent portions, the effect that the accommodation space in the cylinder can be enlarged is reduced. Therefore, even if there are many bent portions, the cross-sectional shape of the cylinder should be reduced to an octagon. .

  Moreover, although this embodiment is employ | adopted as the hydraulic oil tank 8, this invention is not restricted to this, You may employ | adopt as the fuel tank 9. FIG. Since the fuel tank 9 does not generate an internal pressure unlike the hydraulic oil tank 8, the bent portions 83 c and 84 c need not be provided at the four corners of the cylindrical body 8.

  Moreover, although this embodiment was employ | adopted as the hydraulic-oil tank 8 with which a hydraulic shovel is equipped, this invention is not restricted to this, It is employ | adopted as the hydraulic-oil tank and fuel tank with which another kind of construction machine is equipped. Also good.

It is a top view showing a hydraulic excavator provided with a hydraulic oil tank by which one embodiment of the structure of the tank of the construction machine of the present invention was adopted. It is a perspective view which shows this embodiment. It is a top view which shows what remove | excluded the upper board from this embodiment. It is a principal part enlarged plan view which shows the state which fillet-welded two U-shaped members.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Revolving body 2 Traveling body 3 Driver's seat 4 Front work machine 5 Machine room 6 Counterweight 7 Cover 8 Hydraulic oil tank 9 Fuel tank 11 Side frame 11a Side beam 11b Side beam 80 Cylindrical body 80a 1st flat plate part 80b 2nd flat plate part 80c Another first flat plate portion 80d Another second flat plate portion 81 Upper plate 81a First side end surface 81b Second side end surface 81c Another first side end surface 81d Another second side end surface 82 Lower plate 82a First side end surface 82b Second side end surface 82c Another first side end surface 82d Another second side end surface 83 U-shaped member 83a Part of first flat plate portion 83b Part of second flat plate portion 84 Another U-shaped member 84a First flat plate 84b remaining portion of second flat plate portion 85 welded portion 86 welded portion 87 welded portion

Claims (3)

A cylinder that forms the side wall of the tank, a substantially rectangular upper plate that closes the opening at the upper end of the cylinder, and a substantially rectangular lower plate that closes the opening at the lower end of the cylinder, facing each other on the upper plate In the tank structure of the construction machine in which each of the first side end face and the second side end face and each of the first side end face and the second side end face facing each other on the lower plate are arranged in parallel,
Opposing first flat plate portion and second flat plate portion are formed in the cylindrical body, and the first flat plate portion is arranged in parallel to the first side end surface of the upper plate and the first side end surface of the lower plate. The tank structure of the construction machine is characterized in that the second flat plate portion is arranged in parallel to the second side end surface of the upper plate and the second side end surface of the lower plate. An engine, a hydraulic pump driven by the engine, a working machine having a plurality of hydraulic actuators driven by hydraulic oil discharged from the hydraulic pump, and storing the hydraulic oil sucked up by the hydraulic pump and the plurality of hydraulic pressures A hydraulic oil tank that collects return oil from the actuator, and a fuel tank that stores the fuel of the engine are a tank structure of a construction machine that can be applied to the fuel tank of the construction machine and the hydraulic oil tank that are provided in a revolving structure. There,
A cylinder that forms the side wall of the tank, a substantially rectangular upper plate that closes the opening at the upper end of the cylinder, and a substantially rectangular lower plate that closes the opening at the lower end of the cylinder, facing each other on the upper plate In the structure of the tank of the construction machine in which each of the first side end surface and the second side end surface and each of the first side end surface and the second side end surface facing each other on the lower plate are arranged in parallel,
Opposing first flat plate portion and second flat plate portion are formed in the cylindrical body, and the first flat plate portion is arranged in parallel to the first side end surface of the upper plate and the first side end surface of the lower plate. The tank structure of the construction machine is characterized in that the second flat plate portion is arranged in parallel to the second side end surface of the upper plate and the second side end surface of the lower plate. A U-shaped member having a part of the first flat plate part and a part of the second flat plate part, a remaining part excluding the part of the first flat plate part, and the part of the second flat plate part. The construction of a tank for a construction machine according to claim 1 or 2, wherein the tubular body is formed by welding another U-shaped member having a remaining part excluding the part by welding.

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