JP2000062478A - Fuel tank fixing structure of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix a fuel tank in spite of a dimensional error of a fuel tank by positioning the fuel tank with one side abutting a fixed bracket, and pressing the opposite side to a movable bracket capable of moving between the brackets to clamp the fuel tank and fix the same. SOLUTION: A bracket 31 is fixed to a revolving frame floor 30 by a bolt 32. On the opposite side, a bracket 35 is fixed to confront with the bracket 31 in the reverse direction with a fuel tank 1 interposed between them. The leg part 35c of the bracket 35 is provided with an oblong hole in the direction of the tank 1, thereby adjusting the fixing position of the bracket 35. Thus, the bolt hole is formed as the oblong hole to adjust the position of the bracket 35, so that the brackets 31 and 35 or elastic plates 40 and 41 can exactly press the lower part of the tank 1. Accordingly, the tank 1 can be fixed according to the dimensions and be hardly shifted in the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a fuel tank fixing structure mounted on a construction machine or a work vehicle.

[0002]

2. Description of the Related Art As a fuel tank mounted on a construction machine or a work vehicle, a resin tank is used instead of a steel plate tank because of manufacturing cost and the like. However, a resin tank is more difficult to fix than a steel tank because of its strength and shape. For example, there are drawbacks such that the tightening force cannot be increased, the corners are rounded, or the friction coefficient is small, so that it cannot be firmly fixed, and it is difficult to make the dimensions accurate. Therefore, various modifications have been made to the structure for fixing the resin fuel tank.

FIG. 3 shows an example of a conventional tank fixing structure (hereinafter referred to as conventional structure 1). In FIG. 3, in order to fix the fuel tank 1, brackets 3 and 4 are fixed to a swivel frame 2 (or floor) by bolts and nuts (or welding), and a band 5 is attached to the brackets 3 and 4.
Mounting fixtures 6 and 7 for mounting the are provided. The fixture 7 is threaded to adjust the length and tightening force, and has a structure in which a nut 8 is screwed and fixed.
The distance between the brackets 3 and 4 is set larger than the actual size of the tank in consideration of the size tolerance of the resin tank, and in order to be able to attach tanks having slightly different sizes.

Therefore, in this conventional fixing structure 1, since a gap is provided between the fuel tank 1 and the brackets 3 and 4,
An extra space is required, and if the band 5 is stretched and the tightening force is reduced, fixing becomes insufficient, which is a problem. Further, on a floor that is constantly subjected to vibration such as a construction machine, there is a drawback that the position of the bottom surface of the tank 1 is displaced by the vibration and the fixing is loosened.

4 and 5 are disclosed in Japanese Patent Laid-Open No. 8-3242.
The tank mounting device disclosed in No. 65 (hereinafter referred to as the conventional structure 2) is shown. 4 is an overall plan view, and FIG. 5 is FIG.
3 is an enlarged detailed view of a side surface viewed from an arrow AA of FIG. In the figure, four positioning blocks 11 that determine the position of the fuel tank 1 in the front-rear direction are fixed to the base plate 12 by welding. The support surface 13 of the positioning block 11 has a surface shape that matches the shape of each part of the lower surface of the fuel tank 1, and a protrusion 14 is provided on the upper portion thereof.
There is a hole 16 for fixing the. In addition, stopper plates 17 are provided on the lower left and right sides of the fuel tank 1,
18 is fixed by welding.

The fuel tank 1 is installed by inserting a rubber plate 19 between the fuel tank 1 and the positioning block 11.
Fixed at 0 by 0. The band 20 is formed of a flexible thin steel plate, and a belt-shaped rubber band is provided on the lower surface that contacts the fuel tank 1. The end of the band 20 is fixed to the threaded rod 15 and can be tightened with a screw and a nut.

As described above, in the conventional structure 2, the lower side of the fuel tank 1 is fixed in the front-rear direction and the left-right direction, and moreover, it can be firmly fixed by the steel band 20, so that the vibration of the construction machine is reduced. The band is made of steel and does not easily come loose. However, the positioning block 11 and the stopper plate 17,
All 18 are fixed by welding. Therefore, if the size of the fuel tank is large, it cannot be fixed, and if the size is small, it cannot be fixed, and there is a tendency for rattling, which is a problem.

[0008]

As described above, the conventional structure 1 has a problem that the lower surface of the fuel tank is displaced due to vibration, and the conventional structure 2 has a problem that the fuel tank cannot be fixed properly due to a dimensional error of the fuel tank. It was The present invention has been made under the background as described above, and provides a fuel tank mounting structure that can be firmly fixed regardless of the dimensional error of the fuel tank in consideration of the dimensional tolerance of the resin tank. It is an object.

[0009]

To solve the above problems, the present invention employs the following means. That is, claim 1
The invention described above is characterized in that one side surface of the fuel tank is brought into contact with a fixed bracket for positioning, and the other side surface is brought into contact with a movable bracket whose distance between the brackets is movable so as to be sandwiched and fixed.

According to a second aspect of the present invention, in the first aspect of the present invention, a seat surface for attaching a belt is provided on the fixed bracket and the movable bracket, and the belt having both ends fixed to the seat surface is the belt. The feature is that it is hung on the fuel tank and fixed vertically.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein a rubber plate or the like is provided between the fuel tank and the bracket or between the bottom surface of the fuel tank and the installation floor. It is characterized in that an elastic material (or cushioning material) is inserted.

[0012]

1 is a front view of a mounting structure according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. Embodiments of the present invention will be described below with reference to the drawings. In the figure, a bracket 31 is attached to a swivel frame floor 30, and a bolt 32 is attached.
Fixed by. The bolt 32 may be fixed to the floor 30 by welding and tightened with a nut, or the floor 30 may be provided with a female screw hole and screwed into the hole to be fixed. The bracket 31 is formed in a substantially U shape, the leg portion 31c is provided with a bolt hole, the abdomen portion 31b is formed substantially perpendicular to the floor 30, and the head portion 31a is provided with a band 33. Has a seating surface for attaching the one end member 36, and the end member 36 is inclined so that the end member 36 becomes a substantially right angle when the end member 36 is attached.

A bracket 35 is fixed on the opposite side of the fuel tank 1 so as to face the bracket 31 in the opposite direction. An elongated hole 36 is provided in the leg portion 35c of the bracket 35 in the tank 1 direction.
The fixed position of is adjustable. Bracket 3
5 is fixed by a bolt 38. The abdomen 35b of the bracket 35 is perpendicular to the floor 30 and the abdomen 3 of the bracket 31.
The head 35a is fixedly mounted in parallel with 1b, and the head 35a is also provided with a seating surface. The head 33a is inclined so as to be at a substantially right angle when the opposite end member 37 of the band 33 is attached. In addition,
Bolt holes (not shown) are provided on the seat surface,
The end member 37 is threaded to adjust the length, that is, the tightening tension of the tank, and the nuts 37a, 37
It is fixed by b.

A thin steel wire or a thin steel plate is used as the core material of the band 33, and the band 33 withstands a strong tightening tension and the surface is covered with rubber or resin, so that the fuel tank 1 is not scratched and the friction coefficient is large. Is configured to. The band 33 is fixed to the end members 36 and 37.
Plates 40 and 41 made of an elastic material such as a rubber plate or soft plastic are attached to the sides of the abdomen 31b and 35b of the brackets 31 and 35 that contact the fuel tank 1. A plate 42 made of an elastic material is also attached to the floor 30 at a position where the fuel tank is installed. These elastic plates may be attached to the fuel tank 1, or may be inserted when the fuel tank 1 is fixed without being attached.

The fuel tank fixing structure of this embodiment has the above-mentioned structure, and the fuel tank 1 is fixed as follows. First, the fuel tank 1 is placed on the elastic body 42 so as to contact the elastic plate 40, and the elastic plate 41 of the bracket 35 is placed.
While pressing, the bolt 38 is tightened and fixed. Next, the band 33 is hung on the upper surface of the fuel tank 1 and the end member 37 is inserted into the bolt hole provided in the head portion 35a,
Adjust the tension and secure with nuts 37a (and 37b).

The abdomen 31 of the brackets 31 and 37
b and 35b are configured to have appropriate elasticity, and the band 3
The brackets 31 and 35 may be configured to bend slightly inward when the screw 3 is tightened. As a result, the pressure holding the fuel tank is increased, and the fuel tank is more firmly fixed.

In the present embodiment, as described above, the bolt holes are formed in the elongated holes so that the position of the bracket 35 can be adjusted, so that the brackets 31 and 35 or the elastic plate 4 are formed.
0 and 41 can press the lower part of the fuel tank 1 exactly, can be fixed according to the size of the tank, and can be prevented from being displaced in the front-rear direction (left-right direction in FIG. 1). In addition, since there is no gap between the fuel tank 1 and the brackets 31 and 35, it is useful for saving space. Also,
It is fixed vertically by a band, and elastic plates 40-4
Since 2 is inserted and elastically supported, the vibration of the machine is absorbed, and the tank 1 is less likely to be gradually displaced or rotated due to the vibration.

The embodiments and examples of the present invention have been described in detail above with reference to the drawings. However, the specific configuration is not limited to these examples, and design changes within the scope not departing from the gist of the present invention. Etc. are included in the present invention. For example, the band is not limited to the one described above and may have a different configuration.

[0019]

As described above, according to the configuration of the present invention, since the distance between the brackets is adjustable in the invention described in claim 1, the bracket can press the lower portion of the fuel tank 1 exactly. The effect is that it can be fixed according to the dimensions of the tank, and the displacement in the front-rear direction is unlikely to occur.
Further, since the elastic plate is inserted in the gap between the fuel tank and the bracket, the invention described in claim 3 has an effect that vibration of the machine is absorbed and the tank is less likely to be gradually displaced due to the vibration.

[Brief description of drawings]

FIG. 1 shows a front view of an embodiment of the present invention.

FIG. 2 shows a plan view of an embodiment of the present invention.

FIG. 3 shows a front view of a conventional structure.

FIG. 4 shows a plan view of another conventional structure.

5 shows an enlarged detail as seen from A in FIG.

[Explanation of symbols]

1 tank 30 Swirl vs. frame (floor) 31 fixing bracket 33 belt 35 Movable bracket 36 End member 37 End member with adjustable length 40-42 elastic plate

Claims (3)

[Claims] 1. A structure for fixing a fuel tank of a construction machine, wherein one side of the fuel tank is brought into contact with a fixed bracket for positioning, and the other side is brought into contact with a movable bracket whose distance between the brackets is movable. , A structure for fixing a fuel tank of a construction machine, which is characterized by being held and fixed. 2. A seating surface for attaching a belt to the fixed bracket and the movable bracket is provided, and a belt having both ends fixed to the seating surface is hung on the fuel tank and fixed in the vertical direction. The fuel tank fixing structure for a construction machine according to claim 1. 3. The elastic material such as a rubber plate is inserted between the fuel tank and the bracket, or between the bottom surface of the fuel tank and the installation floor. 1. A fuel tank fixing structure for a construction machine according to any one of 1.