JP2018114794A - Automobile fuel tank prop parts - Google Patents

Abstract

A strut part for a fuel tank for an automobile, which reliably absorbs stress and can be broken at its main body when subjected to an excessive impact. A strut part (20) to be attached inside a tank outer wall (10) of a fuel tank (1) for an automobile, wherein the strut part (20) is fused to upper and lower inner surfaces of the tank outer wall (10) of the fuel tank (1) to attach the strut part (20). It has a contact portion 21 and a lower contact portion 22 and a body portion 23 connecting the upper contact portion 21 and the lower contact portion 22 . The upper contact portion 21 and the lower contact portion 22 have an upper welding surface 21a and a lower welding surface 22a that are welded to the inner surface of the tank outer wall 10, respectively. The body portion 23 is formed of a plate member having a bellows-like cross section in the width direction, and an impact absorbing portion 24 that can be broken by an impact is formed near the center of the body portion 23 in the longitudinal direction. [Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to a fuel tank column part made of a thermoplastic synthetic resin, and more particularly to a fuel tank column part having an outer wall formed by blow molding a thermoplastic synthetic resin member and having a column part inside. Is.

Conventionally, the structure of fuel tanks for automobiles and the like has been made of metal, but in recent years, thermoplasticity has been achieved by reducing the weight of the vehicle, eliminating rust, and easily forming into a desired shape. Those made of synthetic resin have come to be used.
In the production of an automotive fuel tank made of a thermoplastic synthetic resin, a blow molding method has been often 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 formed into a cylindrical shape and extruded from above, and the parison is sandwiched between molds and air is blown into the parison to manufacture an automobile fuel tank.

On the other hand, in the blow molding method, it is required to provide a column part having another function in order to improve the rigidity of the outer wall of the tank inside the fuel tank.
In some cases, the column parts are provided inside the fuel tank as shown in FIG. 11 (see, for example, Patent Document 1).
First, as shown in FIG. 11, before the parison 108 enters the blow molding die 140, the column part 120 is placed on the support bar 141, and the blow molding die 140 is opened and positioned therein. Thereafter, the parison 108 is lowered while the blow molding die 140 is kept open so that the column component 120 is positioned inside the parison 108.

After that, before closing the blow molding die 140, the pressing pins 142 are taken out from both sides of the blow molding die 140, the parison 108 is pressed, and the parison 108 is attached to the support member welding surface 123 which is the side end of the column component 120. Press. At this time, since the inner surface of the parison 108 has not yet solidified, the parison 108 and the support member welding surface 123 of the column component 120 can be welded.
Then, the support bar 141 is lowered, the blow molding die 140 is closed, and air is blown to perform blow molding.

In this case, the main body 121 provided between the support member welding surface 123 and the support member welding surface 123 of the column component 120 prevents vibration of the fuel tank and expansion of the fuel tank, thereby ensuring the rigidity of the fuel tank. It was.
Further, as shown in FIG. 12, the upper part of the fuel tank 1 for the automobile fuel tank 1 having an outer wall formed of a synthetic resin is attached to the upper and lower inner surfaces of the tank outer wall of the fuel tank and is attached to the upper and lower parts. One having a main body portion 223 having a large rigidity for connecting the contact portion 221 and the lower contact portion 222 and the upper contact portion 221 and the lower contact portion 222 is considered (for example, see Patent Document 2).

In this case, the main body portion 223 is provided with a central axis 225 at the center, and four plate-shaped vertical reinforcing ribs 224 extending in the vertical direction so as to surround the central axis 225 are formed. The vertical reinforcing rib 224 is integrally attached to the upper contact portion 221 and the lower contact portion 222. The longitudinal reinforcing ribs 224 are formed so as to have a narrow width near the center, and are formed so as to be broken by stress at the narrowed portion.

However, when stress is applied in the direction in which the vertical reinforcing rib 224 does not exist in the column component 220 (the method indicated by the arrows in FIGS. 12 and 13), the vertical reinforcing rib 224 does not break and the upper contact portion 221 or the lower portion There is a risk of fracture at the welded surface between the contact portion 222 and the tank outer wall. This is because, in this direction, the stress is transmitted through the central axis 225 without deformation of the cross-sectional shape of the main body 223.

JP-A-6-143396 Japanese Patent Laid-Open No. 2006-128277

  Therefore, the present invention provides a fuel tank support part for an automobile fuel tank that can absorb the stress reliably regardless of the direction from which it is applied and can be broken at the main body when subjected to excessive impact. This is the issue.

The present invention of claim 1 for solving the above-described problem is a column component attached to the inside of a tank outer wall of an automobile fuel tank having a tank outer wall formed of a synthetic resin.
The strut part has an upper abutment part and a lower abutment part that are fused to the upper and lower inner surfaces of the tank outer wall of the fuel tank, and a main body part that connects the upper abutment part and the lower abutment part. The upper contact portion and the lower contact portion each have an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall,
The main body is formed of a plate member having a cross-sectional shape in the width direction formed in an accordion shape, and an impact absorbing portion that can be broken by an impact is formed near the center in the longitudinal direction of the main body. It is a fuel tank prop part.

According to the first aspect of the present invention, in the column part attached to the inside of the tank outer wall of the automobile fuel tank having the tank outer wall formed of synthetic resin, the column parts are fused to the upper and lower inner surfaces of the tank outer wall of the fuel tank. Then, an upper contact part and a lower contact part for attaching the column parts, and a main body part for connecting the upper contact part and the lower contact part. Therefore, the upper and lower contact portions support the upper and lower portions of the tank outer wall, and the main body portion can absorb the impact of the tank outer wall and prevent excessive expansion and contraction.

The upper contact portion and the lower contact portion each have an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall. For this reason, the upper welding surface of the upper abutting portion and the lower welding surface of the lower abutting portion are fused to the upper wall of the tank outer wall and the inner surface of the lower wall, and the main body portion holds the upper and lower walls. Thus, the rigidity of the tank outer wall can be improved.

Since the main body is formed of a plate member whose cross-sectional shape in the width direction is formed in a bellows shape, even if stress is applied to the column parts from the lateral direction, the cross-sectional shape of the bellows-shaped main body portion is deformed and stress is Therefore, it is possible to prevent the upper welding surface of the upper contact portion and the lower welding surface of the lower contact portion from peeling off from the upper wall of the tank outer wall and the inner surface of the lower wall. Since it is a plate-like longitudinal reinforcing rib, the reinforcing rib, the upper abutting portion, and the lower abutting portion can be combined and molded by a single mold forming, and the molding is easy.

Since an impact absorbing portion that can be broken by an impact is formed near the center of the main body in the longitudinal direction, when an excessive impact is applied to the automobile fuel tank, the impact absorbing portion of the bellows-shaped main body portion is broken. Thus, the shock can be absorbed and the outer wall of the tank is not damaged.

According to the present invention of claim 2, a fuel tank column component for an automobile in which an impact absorbing portion in which the cross-sectional area of a plate member formed in an accordion shape is smaller than other portions is formed near the center in the longitudinal direction of the main body portion. It is.

In the second aspect of the present invention, an impact absorbing portion in which the cross-sectional area of the plate member formed in a bellows shape is smaller than the other portion is formed near the center in the longitudinal direction of the main body portion. For this reason, when an excessive stress is applied to the column parts, the cross-sectional area of the plate member formed in a bellows shape can be reliably broken at a portion smaller than the other portions to absorb the impact.

According to a third aspect of the present invention, the shock absorbing part is a column part of a fuel tank for an automobile in which the width is formed narrower than the other part near the center of the main body part.

In the present invention of claim 3, the shock absorbing portion is formed narrower than the other portions near the center of the main body portion, and therefore when the column component is subjected to excessive stress, the width is larger than the other portions. The narrowly formed portion can be reliably broken to absorb the impact. Moreover, it is only narrowing the width | variety near the center of a main-body part, and shaping | molding of support | pillar components is easy.

According to a fourth aspect of the present invention, the shock absorbing part is a column part of an automobile fuel tank in which a notch part or a hole is formed in a plate member formed in a bellows shape of the main body part.

In the present invention of claim 4, since the notch portion or the hole is formed in the plate member formed in the bellows shape of the main body portion, the shock absorbing portion is applied to the plate member when excessive stress is applied to the column parts. A notch or a hole is formed, and the portion can be reliably broken to absorb the impact.

The present invention according to claim 5 is a column part of a fuel tank for automobiles in which the thickness of the plate member formed in a bellows shape is 3 to 7 mm.

In the present invention of claim 5, since the thickness of the plate member formed in the bellows shape is 3 to 7 mm, the plate member formed in the bellows shape supports the upper part and the lower part of the tank outer wall, The impact of the tank outer wall can be absorbed, excessive expansion and contraction can be prevented, and the rigidity of the tank outer wall can be improved.

When the thickness of the plate member of the main body is less than 3 mm, the rigidity of the plate member is insufficient, the amount of shock absorption of the tank outer wall is small in the main body, and it is difficult to prevent excessive expansion and contraction. In some cases, it is difficult to improve the rigidity of the tank outer wall. In addition, when the thickness of the plate member of the main body exceeds 7 mm, the rigidity of the plate member of the main body is so large that the main body is difficult to bend, and the shock of the outer wall of the tank is difficult to be absorbed by the main body. In some cases, it is difficult for the absorbing portion to break, and the weight of the column parts increases, which is contrary to the weight reduction of the vehicle.

In the present invention of claim 6, the plate member formed in a bellows shape is composed of a bent peak portion and a flat plate portion, and 3 to 5 peak portions are formed. It is.

In this invention of Claim 6, the plate member formed in the shape of a bellows was comprised from the bent peak part and a flat plate part, and 3-5 peak parts were formed. For this reason, even if stress is applied to the column parts from the lateral direction, the bellows-like peak portion is bent and the cross-sectional shape of the main body portion is deformed to absorb the stress. When the number of ridges is less than three, when stress is applied to the column parts, the deflection of the plate member formed in a bellows shape is reduced, the stress is not sufficiently absorbed, and the number of ridges exceeds five. In this case, the interval between the plate members formed in a bellows shape becomes close, the gap between the flexures decreases, and the stress absorption becomes insufficient.

In the seventh aspect of the present invention, the upper contact portion and the lower contact portion are formed in a disk shape, and the outer periphery of the main body portion is a support part of a fuel tank for an automobile formed in an arc shape.

In the present invention of claim 7, since the upper contact portion and the lower contact portion are formed in a disk shape and the outer periphery of the main body portion is formed in an arc shape, from which direction stress is applied to the column component However, it can absorb stress reliably.

Since the main body is formed of a plate member whose cross-sectional shape in the width direction is formed in a bellows shape, even if stress is applied to the column parts from the lateral direction, the cross-sectional shape of the bellows-shaped main body portion is deformed and stress is Can be absorbed. Since an impact absorbing portion that can be broken by an impact is formed near the center of the main body in the longitudinal direction, when an excessive impact is applied to the automobile fuel tank, the impact absorbing portion of the bellows-shaped main body portion is broken. The shock can be absorbed and the outer wall of the tank is not damaged.

It is a fuel tank perspective view which is an embodiment of the invention. It is a partial expanded sectional view which shows the structure of the outer wall of the fuel tank of this invention. It is a perspective view of the support | pillar components attached to the inside of the fuel tank which is embodiment of this invention. It is sectional drawing of the support | pillar components attached to the inside of the fuel tank which is embodiment of this invention, and is sectional drawing along the AA line of FIG. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3, showing a state in which stress is applied to a column component attached to the inside of the fuel tank according to the embodiment of the present invention. It is a front view of the state which attached the support | pillar components which are embodiment of this invention inside the fuel tank. It is sectional drawing of the state which attached the support | pillar components which are embodiment of this invention to the inside of a fuel tank, and is sectional drawing along the BB line of FIG. It is sectional drawing of the state which opened the blow molding die and inserted the support | pillar components in the parison which shows the manufacturing method of the fuel tank of this invention. It is sectional drawing of the state which slid the press pin of the blow molding metal mold | die and shows the support | pillar components with the slide pin which shows the manufacturing method of the fuel tank of this invention. It is sectional drawing of the state which closed the blow molding die which shows the manufacturing method of the fuel tank of this invention. It is sectional drawing of the state which opened the blow molding die which shows the manufacturing method of the conventional fuel tank. It is a perspective view of the other conventional support | pillar components. It is sectional drawing of the other conventional support | pillar components, and is sectional drawing along CC line of FIG.

A column component 20 of a fuel tank 1 for an automobile according to an embodiment of the present invention will be described with reference to FIGS.
In the embodiment of the present invention, as shown in FIG. 1, the fuel tank 1 has a pump unit mounting hole 4 formed on the upper surface so that a fuel pump (not shown) and the like can be taken in and out of the fuel tank 1. . A fuel injection hole 5 for injecting fuel from an inlet pipe (not shown) is formed on the side surface or the upper surface of the fuel tank 1. Further, a strut component 20 as shown in FIG. 3 is attached inside the fuel tank 1.

An outer peripheral rib 2 is formed around the entire circumference of the fuel tank 1, and mounting holes 3 are formed at predetermined locations such as corner portions of the outer peripheral rib 2. The fuel tank 1 is attached to the vehicle body by bolting 3 and the vehicle body. It is also possible to attach a belt to the outer periphery of the fuel tank 1 instead of the attachment hole 3 and attach the fuel tank 1 to the vehicle body by the belt.
Furthermore, on the upper surface of the fuel tank 1, there are formed attachment holes 6 at various places for connecting a hose or the like for collecting the internal fuel vapor.

In the present embodiment, the fuel tank 1 is formed by blow molding, and the tank outer wall 10 includes, for example, a skin layer 11, an external body layer 12, an external adhesive layer 13, in order from the outside, as shown in FIG. The barrier layer 14, the internal adhesive layer 15, and the internal body layer 16 are formed. A post component 20 to be described later is welded to the inner main body layer 16. It is preferable to use a material that is easily welded, for example, the same type of material, for the column component 20 and the inner body layer 16. The tank outer wall 10 may be a single layer or a multilayer other than six layers.

In blow molding, the column part 20 is inserted into the cylindrical parison 8, or the cylindrical parison 8 is cut and flattened, and the blow molding die 40 is opened, and the cavity surfaces on both sides are opened. In some cases, the column component 20 is attached to the flat parison 8 after being attached.
As the blow molded parison 8, the parison 8 composed of the above six layers is used. A parison 8 having a layer configuration of six layers or more can also be used. In addition, the skin layer 11 is used when a reproducing member, a filler, or the like is mixed in the external main body layer 12, but the skin layer 11 can be omitted. Further, if a material having rigidity and fuel oil resistance is used, a one-layer parison can be used.

The skin layer 11 and the outer main body layer 12 are formed of a thermoplastic synthetic resin that has high impact resistance and maintains rigidity against fuel oil, and is preferably formed of high-density polyethylene (HDPE). When the outer main body layer 12 contains an inorganic filler, the outer skin layer 11 is used to cover the surface of the outer main body layer 12, and the surface can be smoothed without any inorganic filler appearing on the surface. .

A strut component 20 is attached inside the fuel tank 1. A method for attaching the column component 20 will be described later. An embodiment of the column component 20 will be described with reference to FIGS.
First, the shape of the column part 20 of the embodiment will be described with reference to FIGS. 3 to 5, and the state attached to the tank outer wall 10 will be described with reference to FIG. 6.

The strut component 20 can be formed of a fuel-resistant thermoplastic synthetic resin such as polyacetal or high-density polyethylene (HDPE). As a result, the strength of the fuel tank 1 can be improved, and even if the fuel tank 1 is attached to the inside of the fuel tank 1, the rigidity does not decrease due to swelling by the fuel oil or the like. Furthermore, if the same kind of material as the tank outer wall 10 of the fuel tank 1 is used, the column component 20 and the tank outer wall 10 can be firmly welded.

As shown in FIG. 3, the support part 20 of the first embodiment is provided with an upper contact part 21 and a lower contact part 22 that are fused to the upper and lower inner surfaces of the tank outer wall 10 to mount the support part 20. It has been. The upper contact portion 21 is formed with an upper welding surface 21 a that is welded to the upper surface of the tank outer wall 10, and the lower contact portion 22 is formed with a lower welding surface 22 a that is welded to the lower surface of the tank outer wall 10.
The upper welding surface 21 a and the lower welding surface 22 a are formed in a planar manner, and are in close contact with the upper and lower inner surfaces of the tank outer wall 10 to be welded.

The upper contact portion 21 and the lower contact portion 22 are connected by the main body portion 23. In the column component 20 according to the embodiment of the present invention, the main body portion 23 is formed of a plate member whose cross-sectional shape in the width direction is formed in a bellows shape. That is, it is composed of a bent main body peak portion 23a and a flat main body flat portion 23b.

The bellows of the main body portion 23 is formed such that the unevenness of bending is continuous in the vertical direction, and the main body portion peak portion 23a and the main body portion flat plate portion 23b are continuous in the vertical direction. The cross-sectional shape in the width direction is shown in FIG. For this reason, even if stress is applied to the column component 20 from the lateral direction, the bellows-shaped main body peak portion 23a bends, and the space between the main body flat plate portion 23b and the main body flat plate portion 23b is reduced as shown in FIG. As a result, the cross-sectional shape of the main body 23 is deformed to absorb the stress.

For this reason, even if stress is applied to the column component 20 from the lateral direction, the cross-sectional shape of the bellows-like main body portion 23 can be deformed to absorb the stress as described above, and the upper portion of the upper contact portion 21 can be absorbed. It can prevent that the welding surface 21a and the lower welding surface 22a of the lower contact part 22 peel from the inner surface of the upper wall of the tank outer wall 10, and a lower wall. Since it is the plate-shaped main body part 23, the main body part 23, the upper abutting part 21 and the lower abutting part 22 can be combined and molded by a single mold molding, and the molding is easy.

In the present embodiment, four main body ridges 23a are formed on the upper side and three are formed on the lower side shown in FIG. It is preferable that 3 to 5 main body peak portions 23a are formed.
When there are less than three main body peak portions 23a, when stress is applied to the column component 20 due to external impact, there are few main body peak portions 23a that cause bending, and stress absorption is insufficient, Alternatively, when excessive stress is applied to the main body peak portion 23a and the number of the main body peak portions 23a exceeds five, there are few bending gaps between the main body flat plate portion 23b and the main body flat plate portion 23b formed in a bellows shape. Therefore, the absorption of stress becomes insufficient.

The thickness of the plate member of the main body portion 23 formed in a bellows shape is preferably 3 to 7 mm. In this case, the plate member of the main body portion 23 formed in a bellows shape supports the upper and lower portions of the tank outer wall 10, and the main body portion 23 absorbs the shock of the tank outer wall 10 to prevent excessive expansion and contraction. The rigidity of the tank outer wall 10 can be improved.

When the thickness of the plate member of the main body portion 23 is less than 3 mm, the rigidity of the main body portion 23 is insufficient, the main body portion 23 has a small amount of shock absorption, and prevents excessive expansion and contraction. It may be difficult to improve the rigidity of the tank outer wall 10. Moreover, when the thickness of the plate member of the main body part 23 exceeds 7 mm, the rigidity of the main body part 23 is large and the main body part 23 is difficult to bend, and the main body part 23 is difficult to absorb the impact of the tank outer wall 10. In some cases, it is difficult to break the impact absorbing portion 24 described later, and the weight of the column component 20 increases, which is contrary to the weight reduction of the vehicle.

In the present embodiment, the cross-sectional shape of the main body portion 23 is an arc shape, and the upper contact portion 21 and the lower contact portion 22 are formed in a disc shape.
As shown in FIG. 4, the outer periphery of the main body 23 can be formed in an arc shape from the upper part to the lower part of the surface connecting the tips of the main body peak parts 23a. In this case, even if stress is applied to the columnar component 20 from any direction, the stress can be reliably absorbed.

An impact absorbing portion 24 that can be broken by an impact is formed near the center of the main body portion 23 in the longitudinal direction. When an excessive impact is applied to the fuel tank 1, the impact absorbing portion 24 can absorb the impact by breaking the impact absorbing portion 24 of the bellows-shaped main body portion 23, and damage the tank outer wall 10. It is to prevent it from occurring.

In the present embodiment, as shown in FIG. 3, the shock absorbing portion 24 is arranged in the vicinity of the center in the longitudinal direction of the main body portion 23 so that the cross-sectional area of the plate member formed in a bellows shape is smaller than the other portions. Is formed. That is, as shown in FIG. 3, the outer periphery of the main body portion 23 is formed so that the outer diameter becomes narrower toward the center while maintaining the arc shape, and the cross-sectional area of the central portion is larger than any portion. It is formed to be smaller.

For this reason, when an impact is applied to the fuel tank 1 from the outside, a stress is applied to the main body portion 23 of the support column component 20, and the cross-sectional area of the main body portion 23 formed in a bellows shape is smaller than the other portions. The stress is concentrated on the shock absorbing portion 24 near the center, and the vicinity of the center is surely broken to absorb the shock.

In addition, the impact absorption part 24 can be provided by forming a notch part or a hole in the main body part flat plate part 23b formed in the bellows shape of the main body part 23. In this case, as described above, the cross-sectional area in the vicinity of the center of the main body portion 23 may be formed to be smaller than that of other portions, and a notch or a hole may be further formed. The width near the center of the portion 23 may be the same, and a notch or a hole may be formed.

Even when the notch or hole is provided with the width of the main body 23 near the center being the same as that of the other part, the cross-sectional area of the notch or hole is reduced.
Since the notch portion or hole is formed in the main body portion 23, when a shock is applied to the fuel tank 1 from the outside and the strut component 20 is stressed, the notch portion or hole of the main body portion 23 is formed. It can break reliably and absorb the impact.

Next, based on FIGS. 6-7, the state which attached the support | pillar components 20 of embodiment of this invention to the inside of the fuel tank 1 is demonstrated.
As shown in FIGS. 6 to 7, the tank outer wall 10 of the fuel tank 1 is formed with an outer wall inner surface protruding portion 18 that protrudes inside the fuel tank 1 so as to face the upper wall and the lower wall. A planar outer wall inner surface welding surface 17 is formed on a surface of the outer wall inner surface protruding portion 18 facing the upper welding surface 21a and the lower welding surface 22a. For this reason, the outer wall inner surface protruding portion 18 is more rigid than the other portion of the tank outer wall 10 of the fuel tank 1 and can absorb an impact from the outside.
The outer wall inner surface welding surface 17 is welded to the upper welding surface 21 a and the lower welding surface 22 a of the column component 20.

As shown in FIGS. 7 and 8, the outer wall inner surface 17 is formed to be smaller than the upper surface 21 a and the lower surface 22 a, and the upper surface 21 a and the lower surface 22 a are the outer wall inner surface 17. It is formed so that a space is formed on the outer peripheral side in the lateral direction. For this reason, when the upper welding surface 21a and the lower welding surface 22a are welded to the outer wall inner surface welding surface 17, the melted protrusion that is pushed out from the welding portion and protrudes in the lateral direction is the upper welding surface 21a and lower welding surface 22a side. Even if a low temperature impact is applied from the outside, the tank outer wall 10 of the fuel tank 1 is not damaged.

When the column component 20 is attached to the outer wall inner surface welding surface 17 of the fuel tank 1, the bellows-shaped main body portion 23 holds the upper welding surface 21a and the lower welding surface 22a from the fuel tank 1 received from the outer wall inner surface protruding portion 18. In addition to absorbing impact, the main body 23 holds the outer wall inner surface protruding portion 18 to support the upper and lower walls of the tank outer wall 10 even when the tank outer wall 10 of the fuel tank 1 expands or contracts. It is possible to prevent the tank outer wall 10 from being excessively expanded or contracted.
Further, even if the tank outer wall 10 is twisted, the main body 23 of the column component 20 can prevent the tank outer wall 10 from being twisted.

Next, a method for manufacturing the fuel tank 1 of the present invention by blow molding will be described with reference to FIGS.
First, as shown in FIG. 8, the parison 8 is lowered into the opened blow molding die 40, and the column component 20 is held by the support rod 41 while the parison 8 is pre-blowed, and the column component 20 is held by the parison 8. Place inside.

Then, as shown in FIG. 9, the first pinch plate 43 is slid to hold the lower end of the parison 8 together with the support bar 41. At the same time, the plurality of pressing pins 42 provided on the blow molding die 40 are slid to press the parison 8 so as to be sandwiched between the column parts 20 and the pressing pins 42.

Then, since the inner surface of the parison 8 is still in a molten state, the upper welding surface 21a and the lower welding surface 22a of the column component 20 can be fused to the parison 8 as described above. At this time, since the column component 20 is held by the support rod 41, the column component 20 can be reliably attached to a predetermined position of the tank outer wall 10 of the fuel tank 1.
Moreover, the upper welding surface 21a and the lower welding surface 22a can be heated in advance to be in a molten state, thereby improving the welding strength.

Thereafter, as shown in FIG. 10, the support bar 41 is lowered and removed from the blow molding die 40, the second pinch plate 44 is slid to close the parison 8, and the blow molding die 40 is closed to slide the cutter. At 46, the parison 8 is cut. When closing the blow molding die 40, the pressing pin 42 continues to press the parison 8 as it is. Thereby, the support | pillar component 20 can be kept at a predetermined position.

Then, air is blown into the inside of the parison 8 from the air nozzle 45, and the outer surface of the parison 8 is pressed against the blow molding die 40 to form the fuel tank 1. At this time, the front end surface of the pressing pin 42 and the cavity inner surface of the blow molding die 40 can be flush with each other.
Thereafter, the blow molding die 40 is opened and the fuel tank 1 is taken out.

DESCRIPTION OF SYMBOLS 1 Fuel tank 10 Outer wall 20 Support | pillar component 21 Upper contact part 22 Lower contact part 23 Main body part 24 Shock absorption part

Claims (7)

In a column part attached to the inside of the tank outer wall of an automobile fuel tank having a tank outer wall formed of a synthetic resin,
The strut components are fused to the upper and lower inner surfaces of the tank outer wall of the fuel tank, and an upper abutment portion and a lower abutment portion for mounting the strut components, and a main body connecting the upper abutment portion and the lower abutment portion. Each of the upper contact portion and the lower contact portion has an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall, respectively.
The main body is formed of a plate member having a cross-sectional shape in the width direction formed in a bellows shape, and an impact absorbing portion that can be broken by an impact is formed near the center in the longitudinal direction of the main body. Automobile fuel tank prop parts. The column of the fuel tank for automobiles according to claim 1, wherein the shock absorbing portion having a cross-sectional area of the plate member formed in a bellows shape smaller than other portions is formed near the center in the longitudinal direction of the main body portion. parts. 3. The fuel tank prop part according to claim 1, wherein the shock absorbing part is formed narrower in the vicinity of the center of the main body than the other part. 4. The said shock absorption part is a support | pillar component of the fuel tank for motor vehicles of Claim 1 or Claim 2 by which the notch part or the hole was formed in the said plate member formed in the bellows shape of the said main-body part. The column part of the fuel tank for automobiles according to any one of claims 1 to 4, wherein the plate member formed in a bellows shape has a thickness of 3 to 7 mm. The said plate member formed in the shape of a bellows is comprised from the bent peak part and a flat plate-shaped flat plate part, The said peak part is formed in any one of Claim 1 thru | or 5 formed in 5 pieces. The automotive fuel tank support part described. The automobile fuel according to any one of claims 1 to 6, wherein the upper contact portion and the lower contact portion are formed in a disc shape, and an outer periphery of the main body portion is formed in an arc shape. Tank strut parts.

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