JP2019098762A - Fuel tank attachment part structure for motor vehicle - Google Patents

Abstract

To provide a fuel tank attachment part structure for a motor vehicle which enables a tank attachment part to be easily formed at a tank body outer wall of a fuel tank, achieves high strength of the tank attachment part, and enables easy attachment work.SOLUTION: A fuel tank 1 attachment part structure for a motor vehicle is formed by a synthetic resin. The fuel tank 1 includes: a tank body outer wall 10 forming an outer wall of a fuel tank body 7; and multiple tank attachment parts 20 which attach the fuel tank 1 to a periphery of the tank body outer wall 10. The tank attachment part 20 has: an attachment part body part 21 having a flat plate shape; an attachment part joint part 26 which allows the attachment part body part 21 to integrally continue into the tank body outer wall 10; and attachment part side walls 23 integrally formed at both side parts of the attachment part body part 21. The attachment part side wall 23 extends from the attachment part body part 21 upward or downward in a substantially perpendicular direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mounting portion of a fuel tank for a motor vehicle which is mounted under a floor panel of a motor vehicle or the like.

Conventionally, metal fuel tanks have been used as fuel tank structures for automobiles, but in recent years, thermoplasticity has been achieved due to weight reduction of vehicles, absence of rust, ease of forming into a desired shape, etc. Products made of synthetic resin have come to be used.
In the production of thermoplastic synthetic resin fuel tanks for automobiles, a blow molding method has often been used because of the ease of molding a hollow body. In the blow molding method, a parison of a molten thermoplastic synthetic resin member is made cylindrical and extruded from above, and the parison is sandwiched between molds and air is blown into the parison to produce a fuel tank for an automobile.

As shown in FIG. 1, in the fuel tank 101 manufactured by blow molding, a tank flange portion 117 is formed around the fuel tank 101, and a tank mounting portion 120 is formed at a corner portion of the tank flange portion 117. The tank mounting portion 120 is formed with a mounting portion mounting hole 122 for mounting the fuel tank 101 to a vehicle body, and a bolt, a nut, a clamp or the like is inserted into the mounting portion mounting hole 122 (See, for example, Patent Document 1).

When the vehicle travels, stress may be generated in the tank mounting portion 120 fixed to the vehicle body by the mounting portion mounting hole 122 due to vibration of the vehicle or the like, which may cause a crack or the like.
Therefore, as shown in FIG. 8, there is one in which the tank mounting portion 220 is formed around the tank main body outer wall 210 of the fuel tank 201, and the shape of the tank mounting portion 220 is formed into a mountain shape in cross section (e.g. reference.).

The tank mounting portion 220 is formed of a to-be-fastened portion 221 and a pair of left and right side portions 223 extending in an oblique direction sandwiching the to-be-fastened portion 221 integrally from left and right. A bolt hole 222 is formed in the fastened portion 221.
In this case, the pair of left and right side portions 223 is formed in a pair on the side surface of the tank body outer wall 210, the lower surface of the bolt hole 222 forms a recess, and the operation of fitting a nut or the like into the bolt is difficult .

JP, 2009-132297, A JP, 2011-94916, A

In the present invention, the tank mounting portion can be easily formed on the tank main body outer wall of the synthetic resin fuel tank, the strength of the tank mounting portion is large, and the mounting portion structure of the fuel tank for automobiles easy to mount The challenge is to provide

The present invention according to claim 1 for solving the above-mentioned problems relates to a mounting portion structure of a fuel tank for an automobile formed of a synthetic resin,
The fuel tank is provided with a tank body outer wall forming the outer wall of the fuel tank body, and a plurality of tank mounting portions for mounting the fuel tank around the tank body outer wall.
The tank mounting portion is integrally formed with a flat mounting portion main body portion, a mounting portion joint portion integrally connecting the mounting portion main body portion with the tank main body outer wall, and side portions on both sides of the mounting portion main body portion Have a side wall,
The mounting portion side wall is a mounting portion structure of a fuel tank that is characterized by extending substantially perpendicularly from the mounting portion main body upward or downward.

According to the first aspect of the present invention, in the fuel tank attachment portion structure for an automobile formed of a synthetic resin, the fuel tank includes a tank body outer wall forming the outer wall of the fuel tank body and a fuel tank around the tank body outer wall. Are provided with a plurality of tank mounting parts for mounting the Therefore, the fuel tank can be reliably and stably attached to the vehicle body by the plurality of tank attachment portions formed on the outer wall of the tank body. In addition, the fuel tank can be formed at the same time as the fuel tank is formed, which is efficient.

The tank mounting portion is integrally formed with a flat mounting portion main body portion, a mounting portion joint portion integrally connecting the mounting portion main body portion with the tank main body outer wall, and side portions on both sides of the mounting portion main body portion It has a side wall. For this reason, the attachment portion main body portion integrally continues with the tank main body outer wall, and the attachment portion side wall integrally formed with the attachment portion main body portion improves the rigidity of the attachment portion main body portion. .

The mounting portion side wall is extended substantially vertically from the mounting portion main body upward or downward. Therefore, the rigidity of the mounting body can be reliably improved by the side wall of the mounting portion, and damage or the like of the tank mounting portion can be prevented even if stress is applied to the tank mounting portion due to vibration of the vehicle. In addition, the mounting side wall can be easily formed, and the mounting side wall does not prevent the attachment of a nut or the like.

According to a second aspect of the present invention, the mounting portion side wall is a mounting portion structure of a flange portion of a fuel tank which is extended in a substantially perpendicular direction upward and downward from the mounting portion main body.

According to the present invention of claim 2, the side wall of the mounting portion is extended substantially vertically from the mounting portion main body portion upward and downward, so that the mounting portion main body portion is supported from both the upper and lower sides, and the rigidity of the tank mounting portion Can be further improved.

According to a third aspect of the present invention, there is provided a fuel tank mounting portion structure in which the width of the mounting portion side wall is larger than the thickness of the mounting portion main body.

In the present invention of claim 3, the width of the attachment side wall is formed to be larger than the thickness of the attachment main body, so that the rigidity of the tank attachment can be further improved, and the height of the attachment side sidewall can be increased. There is no need to increase the size of the mounting portion, and the mounting side wall can be easily formed.

According to a fourth aspect of the present invention, there is provided a fuel tank mounting structure in which the mounting portion main body is formed to have a four-sided, three-sided, trapezoidal, oval or circular planar shape.

According to the fourth aspect of the present invention, the mounting portion main body is formed to have a quadrangular, triangular, trapezoidal, elliptical or circular planar shape. For this reason, the shape of the mounting portion main body can be selected according to the shape of the tank main body outer wall of the fuel tank and the shape of the portion of the vehicle body to be attached.

According to a fifth aspect of the present invention, the mounting portion main body portion has a fuel tank mounting portion structure in which a mounting portion mounting hole for mounting the tank mounting portion to the vehicle body is formed in the vicinity of the center.

In the present invention of claim 5, the mounting portion main body portion is formed with a mounting portion mounting hole for mounting the tank mounting portion to the vehicle body in the vicinity of the center. Therefore, the fuel tank can be mounted by inserting a bolt or the like into the mounting portion mounting hole. In addition, in the blow molding process for forming the tank flange, the mounting portion mounting hole can be formed at the same time, and the mounting portion mounting hole is not formed in another step, and the productivity is good.

The tank mounting portion has a mounting portion joint portion integrally connecting the mounting portion main body portion with the tank main body outer wall, and a mounting portion side wall, so the tank mounting portion is integrally continuous with the mounting portion main body portion At the same time, the mounting side wall improves the rigidity of the mounting portion main body.
The mounting portion side wall extends upward or downward substantially at right angles from the mounting portion main body portion. Therefore, the rigidity of the mounting portion main body portion can be reliably improved by the mounting portion side wall, and the tank is vibrated by the vehicle. Even if stress is applied to the mounting portion, breakage or the like of the tank mounting portion can be prevented.

It is a perspective view of a fuel tank of the present invention. It is an expanded sectional view of the outer wall of the fuel tank main part of the present invention. It is an enlarged plan view of a tank attachment part of a fuel tank of the present invention. It is the expansion perspective view which provided the attaching part side wall upper part and the attaching part side wall lower part in the tank attaching part of the fuel tank of this invention. It is the expansion perspective view which provided the attaching part side wall lower part in the other tank attaching part of the fuel tank of this invention. It is an enlarged front view which shows the tank mounting part of the fuel tank of this invention. It is a top view which shows the strength test of the tank mounting part of the fuel tank of this invention. It is a perspective view of the conventional fuel tank.

In the embodiment of the present invention, the structure of the tank mounting portion 20 of the fuel tank 1 will be described based on FIGS. 1 to 7.
As shown in FIG. 1, the fuel tank 1 according to the embodiment of the present invention is formed by blow molding, and the tank body outer wall 10 which is the outer wall of the fuel tank body 7 is one cylindrical parison to the upper wall of the fuel tank. And the lower wall of the fuel tank are integrally formed.

A tank flange portion 17 is formed on the continuous portion where the fuel tank upper side wall and the fuel tank lower side wall are connected so as to protrude in the outer peripheral direction and surround the outer periphery of the tank body outer wall 10. The upper side wall of the fuel tank and the lower side wall of the fuel tank may be welded together and formed integrally using two plate-like parisons.

As shown in FIG. 1, a tank mounting portion 20 for mounting the fuel tank 1 to a vehicle body is formed at a corner portion of the tank flange portion 17. The tank mounting portion 20 is appropriately formed not only at the corner portion but also at a portion necessary for fixing the fuel tank 1 such as the side surface of the tank flange portion to the vehicle body. A mounting portion mounting hole 22 is formed in the tank mounting portion 20, and a bolt and a nut (not shown) or a clamp or the like can be inserted into the mounting portion mounting hole 22 and fixed to the vehicle body. The tank mounting portion 20 can also be formed directly on the tank body outer wall 10 without being formed on the tank flange portion 17.

The tank mounting portion 20 is formed in the tank flange portion 17, and the tank flange portion 17 is formed to protrude laterally outward from the tank main body outer wall 10 of the fuel tank 1, and the tank flange portion 17 is a fuel tank upper side wall And the lower wall of the fuel tank may be formed in a continuous or integrated part. The strength of the fuel tank main body 7 can be improved by the tank flange portion 17.
In the present embodiment, the tank main body outer wall 10 is formed of one parison, and both the upper and lower fuel tank sidewalls have the configuration shown in FIG.

In the present embodiment, the fuel tank body 7 is formed by multilayer blow molding, and the upper side wall and the lower side wall of the fuel tank of the outer wall 10 of the tank body have an integral multilayer structure of synthetic resin, as shown in FIG. The outer skin layer 11, the outer main body layer 12, the outer adhesive layer 13, the barrier layer 14, the inner adhesive layer 15, and the inner main body layer 16 are sequentially formed from the outer side. The composition of each layer will be described later.

In the embodiment of the present invention, a parison composed of the above six layers is used in blow molding. However, it is also possible to use parisons having a layer construction other than a single layer or six layers. Moreover, although the skin layer 11 is used when mixing a reproduction | regeneration member, a filler, etc. in the outer side main body layer 12 so that it may mention later, the skin layer 11 can also be abbreviate | omitted.

The composition of the tank body outer wall 10 is made of a thermoplastic synthetic resin having high impact resistance and maintaining rigidity against fuel oil, and the skin layer 11 and the outer body layer 12 are made of high density polyethylene (HDPE) Preferably it is formed. When the outer main body layer 12 contains the inorganic filler, since the surface of the outer main body layer 12 is covered, the skin layer 11 is used, and the inorganic filler does not go out on the surface, and the surface can be made smooth. .

The tank mounting portion 20 has an upper surface formed of the material of the upper side wall of the fuel tank, and a lower surface formed of the material of the lower side wall of the fuel tank. In the present embodiment, the outermost layers of the upper and lower surfaces of the tank mounting portion 20 are formed of the skin layer 11, and the outer body layer 12, the outer adhesive layer 13, the barrier layer 14 and the inner adhesive are formed inside the skin layer 11. It is formed continuously with the layer 15. At the inner center of the inner adhesive layer 15, the fuel tank upper side wall and the inner body layer 16 of the fuel tank lower side wall are united.

The outer surface of the tank mount 20 is covered by the outer body layer 12 with the skin layer 11 of the multilayer parison. Since the barrier layer 14 covers the inner main body layer 16 inside the outer main body layer 12, the fuel in the fuel tank 1 does not penetrate from the mounting portion mounting hole 22 and the strength of the tank mounting portion 20 is also secured. be able to.

As shown in FIG. 1, a pump unit mounting hole 4 is formed in the fuel tank upper side wall of the fuel tank main body 7 in order to put in and out a fuel pump (not shown) and the like. After a fuel pump (not shown) is mounted in the fuel tank 1 from the pump unit mounting hole 4, the pump unit mounting hole 4 can be closed by a pump unit mounting lid (not shown).

Further, an inlet pipe connection portion 5 is attached to an upper side wall of the fuel tank to connect with an inlet pipe (not shown) for injecting fuel into the fuel tank 1 from a fuel supply port (not shown) provided in the vehicle body. There is. Further, a mounting portion 6 such as a mounting portion of a fuel pipe for transferring fuel from the fuel pump to the engine is also mounted. Further, an electric cord for driving the fuel pump and various pipes for adjusting the evaporated fuel in the fuel tank 1 are attached.

Next, the tank mounting portion 20 of the automotive fuel tank 1 will be described with reference to FIGS.
As shown in FIG. 3, the tank mounting portion 20 includes a flat mounting portion main body portion 21, a mounting portion joint portion 26 integrally connecting the mounting portion main body portion 21 with the tank main body outer wall 10, and a mounting portion main body portion It has an attaching part side wall 23 formed on the side of the both sides of 21. Therefore, in the tank mounting portion 20, the mounting portion main body portion 21 integrally continues with the tank main body outer wall 10, and the mounting portion side wall 23 improves the rigidity of the mounting portion main body portion 21.

In the present embodiment, the mounting portion main body portion 21 is formed to have a trapezoidal planar shape, and the mounting portion bonding portion 26 is formed wider at the side and narrower at the tip end side. The width of the tip (indicated by A in FIG. 3) is approximately 65 mm and is formed in a straight line. The attachment joint portion 26 is formed in an arc shape so as to be convex with respect to the tank main body outer wall 10. Therefore, the tank mounting portion 20 is less likely to be deformed relative to the tank body outer wall 10.
In addition, the width | variety (it shows by B in FIG. 3) of the front-end | tip including the attaching part side wall 23 is formed in about 85 mm.

As shown in FIG. 4, the mounting portion side wall 23 is provided with a mounting portion side wall upper portion 24 and a mounting portion side wall lower portion 25 extending upward from the side portion of the mounting portion main portion 21 in a substantially perpendicular direction. Therefore, the rigidity of the mounting portion main body portion 21 can be reliably improved by the mounting portion side wall 23, and the mounting portion side wall 23 is mounted on the vehicle body, and the tank mounting portion 20 is vertically stressed by vibration of the vehicle. Even in this case, breakage of the tank mounting portion 20 can be prevented. In addition, the upper and lower surfaces of the mounting portion main body portion 21 have open spaces, so that the mounting portion side wall 23 can be easily formed, and the mounting portion side wall 23 does not prevent attachment of a nut or the like.

In the embodiment shown in FIG. 4, the mounting portion side wall 23 is formed with both the mounting portion side wall upper portion 24 and the mounting portion side wall lower portion 25. However, as shown in FIG. You may provide, and you may provide only the attaching part side wall upper part 24 further.
Although the rigidity of the tank mounting portion 20 can be further improved by providing both the mounting portion side wall upper portion 24 and the mounting portion side wall lower portion 25, the rigidity of the tank mounting portion 20 can be improved even with only one of them.

It is preferable that the attachment side wall 23 be formed thicker than the attachment main body 21. For example, when the thickness (indicated by X in FIG. 6) of the attaching portion main body 21 is 7 to 9 mm, the width (indicated by Y in FIG. 6) of the attaching portion side wall 23 is 8 to 12 mm. be able to. In addition, the height (it shows by Z in FIG. 6) of the attaching part side wall upper part 24 and the attaching part side wall lower part 25 can be about 4-12 mm.

Therefore, in the case where the mounting portion side wall upper portion 24 and the mounting portion side wall lower portion 25 are provided, the entire height of the mounting portion side wall 23 is about 16 to 32 mm.
As described above, since the width of the mounting portion side wall 23 is increased, the height of the mounting portion side wall 23 does not need to be increased, and the mounting portion side wall 23 can be easily formed. It does not get in the way.

The attachment portion main body portion 21 can be formed to have a rectangular, triangular, trapezoidal, oval or circular planar shape. According to the shape of the location formed on the tank body outer wall 10 of the fuel tank 1, the mounting portion main body 21 further selects the shape of the mounting portion main body 21 in accordance with the shape of the portion of the vehicle body to be mounted. Can.

The mounting portion mounting hole 22 for mounting the tank mounting portion 20 to the vehicle body is formed in the vicinity of the center of the mounting portion main body portion 21. The fuel tank 1 can be mounted on the vehicle body by inserting a bolt or the like into the mounting portion mounting hole 22. Further, in the blow molding process for forming the tank flange portion 17, the mounting portion main body portion 21 and the mounting portion mounting hole 22 can be formed at the same time, and the mounting portion mounting hole 22 can be formed in another step. There is no productivity. The diameter of the mounting portion mounting hole 22 is selected depending on the diameter of the bolt used, but can be about 9 to 22 mm.

Next, the results of measurement of the state of relaxation of the stress of the tank mounting portion 20 will be described with reference to FIG.
The shape of the tank mounting portion 20 is, as shown in FIG. 3, the width of the tip of the mounting portion main body portion 21 (indicated by A in FIG. 3) is 65 mm, and the width including the mounting portion side wall 23 (FIG. 3) ) Is 85 mm. The thickness of the mounting portion main body portion 21 is 8 mm, and the diameter of the mounting portion mounting hole 22 is 10 mm. The mounting portion side wall 23 has a height of 8 mm and a width of 10 mm for the mounting portion side wall upper portion 24 and the mounting portion side wall lower portion 25.

The shape of the tank mounting portion 20 of the comparative example measured for comparison is the same as that shown in FIG. 3 except that the mounting portion side wall 23 is not provided in FIG. The portion side wall 23 has a shape in which the mounting portion main body portion 21 is extended, the thickness of the mounting portion main body portion 21 is 8 mm, and the width of the tip is 85 mm.

Then, a bolt is inserted into the mounting portion mounting hole 22, and the periphery of the mounting portion mounting hole 22 is completely restrained, and a load of 100 N is applied in the vertical direction as shown by the arrow in FIG. The stress of the portion close to the tank body outer wall 10 of the portion 21 was measured.
In the shape of the present embodiment, the stress of the mounting portion main body portion 21 was 8.3 MPa, and the amount of deformation of the tip of the tank mounting portion 20 was 1.3 mm. In addition, the stress of the attaching part main-body part 21 of the comparative example was 9.5 Mpa, and the deformation of the front-end | tip of the tank attaching part 20 was 1.6 mm. For this reason, it is understood that the tank attachment portion 20 can reduce the amount of deformation and the stress as compared with the conventional shape.

When molding the fuel tank 1, the parison is held between the blow upper mold and the blow lower mold of the blow mold produced in two divided parts, the parison is blown, and the blow upper mold is placed on the fuel tank. A side wall is formed, and a blow lower mold forms a lower side wall of the fuel tank. At this time, the upper and lower mold portions of the fuel tank are continuously held by the upper and lower blow molds at a portion where the upper side wall and the lower side wall of the fuel tank are continuous with each other. .

At this time, the mounting portion mounting hole 22 of the tank mounting portion 20 and the mounting portion side wall 23 are simultaneously formed. The mounting portion side wall upper portion 24 is formed of a blow upper mold, the mounting portion side wall lower portion 25 may be formed of a blow lower mold, and the mounting portion main body portion 21 is formed by being held between the blow upper mold and the blow lower mold. It can be done. Therefore, the tank mounting portion 20 can be molded at the same time as the fuel tank 1 is molded.

DESCRIPTION OF SYMBOLS 1 fuel tank 10 tank main body outer wall 17 tank flange part 20 tank mounting part 21 mounting part main body part 22 mounting part mounting hole 23 mounting part side wall

Claims (5)

In a mounting structure of a fuel tank for an automobile formed of a synthetic resin,
The fuel tank is provided with a tank body outer wall forming the outer wall of the fuel tank body, and a plurality of tank mounting portions for attaching the fuel tank around the tank body outer wall,
The tank mounting portion is integrally formed with a flat mounting portion main body portion, a mounting portion joint portion integrally connecting the mounting portion main body portion with the tank main body outer wall, and side portions on both sides of the mounting portion main body portion. Mounting side walls to form on the
The mounting portion structure of a fuel tank according to the present invention, wherein the side wall of the mounting portion extends upward or downward substantially perpendicularly from the mounting portion main body portion.   The fuel tank mounting portion structure according to claim 1, wherein the mounting portion side wall is extended substantially vertically from the mounting portion main body portion upward and downward.   The fuel tank mounting structure according to claim 1 or 2, wherein the width of the mounting side wall is equal to or greater than the thickness of the mounting body.   The fuel tank mounting portion structure according to any one of claims 1 to 3, wherein the mounting portion main body is formed to have a planar shape of a quadrangle, a triangle, a trapezoid, an oval or a circle. The fuel tank mounting portion structure according to any one of claims 1 to 4, wherein the mounting portion main body portion has a mounting portion mounting hole for mounting the tank mounting portion to a vehicle body formed in the vicinity of the center.

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