JP2014104693A - Fitting structure of insert member of blow molded part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the fitting structure of an insert member in which an insert member is buried in the outer wall of a blow molded part, and there is reduced variation in dimensions upon fitting of the insert member.SOLUTION: In the fitting structure of an insert member 20 where at least a part of the insert member 20 is buried in the outer wall 2 of a blow molded part 1, the insert member 20 has: a cylindrical part passing through the outer wall of the blow molded part; and a flange part 30 bulged in the wide direction to the outer face of the cylindrical part. The flange part 30 is buried in the outer wall 2 of the blow molded part 1, and the cylindrical part has: an outer cylindrical part 21 bulged to the outside of the blow molded part 1; and an inner cylindrical part 22 bulged to the inside of the blow molded part. The tip part of the inner cylindrical part 22 has a parison tearing part 25, the parison tearing part 25 forms a sharp tip part 27 of tearing a parison at the tip, and has a flat part 26 at a part of the cylindrical wall of the inner cylindrical part 22 on a root side than the sharp tip part 27.

Description

  The present invention relates to an insert member mounting structure in which at least a part of an insert member is embedded in an outer wall of a blow molded product. In particular, it can be used for an insert member attached to an automobile fuel tank formed by blow molding.

In a fuel tank for automobiles, a filler tube for injecting fuel into the fuel tank is attached to the fuel tank.
Conventionally, such fuel tanks have been made of metal. However, in recent years, there are also those made of thermoplastic resin due to the weight reduction of vehicles, the absence of rust, and the ease of molding into a desired shape. It has come to be used.

  And since the manufacture is easy, the fuel tank 1 which is a blow molded product manufactured by blow molding is used. Also in the fuel tank 1 which is such a thermoplastic resin blow-molded product, as shown in FIG. 9, various tubes for injecting or discharging liquid or gas into the fuel tank 1 together with various hoses and cables. A tube attachment member 120 for attaching a pipe or a pipe is attached to the outer wall of the fuel tank 1.

  For example, as shown in FIG. 10, a tube attachment member 120 is fused to a tank outer wall 102 of a thermoplastic synthetic resin fuel tank 101 which is a blow molded product manufactured by blow molding (for example, Patent Document 1). reference.). The tube attachment member 120 is provided with a fusion seat 123 and is fused to the tank outer wall 102. An air vent hole 124 is formed in the fusion seat 123. The air vent hole 124 is for releasing air between the parison and the fusion seat 123 during blow molding.

  In such a structure, due to variations in the wall thickness of the parison, the total dimensions of the tube mounting member 120 and the parison change, and the total length of the tube mounting member 120 and the parison varies. Then, when the dimension of the tube attachment member 120 from the tank outer wall 102 varies, or when one end of the tube attachment member 120 extends into the fuel tank 101, the tube attachment is performed inside the fuel tank 101. Resin adheres to the parison at the tip of the member 120, and the dimensions of the tip of the tube mounting member 120 vary.

JP 2003-236920 A

  Therefore, the present invention is intended to provide an insert member mounting structure in which an insert member is embedded and mounted on the outer wall of a blow molded product, which has a small variation in dimension when the insert member is mounted.

In order to solve the above problems, the present invention of claim 1 is an insert member mounting structure in which at least a part of an insert member is embedded in an outer wall of a blow molded product.
The insert member has a cylindrical portion penetrating the outer wall of the blow molded product and a flange portion projecting in the width direction on the outer surface of the cylindrical portion, and the flange portion is embedded in the outer wall of the blow molded product, Has an outer cylinder part projecting outside the blow molded product and an inner cylinder part projecting inside the blow molded product,
The inner cylinder portion has a parison cut portion at the tip portion, and the parison cut portion forms a sharp tip portion that cuts the parison at the tip portion, and a part of the cylindrical wall of the inner tube portion on the root side from the sharp tip portion The mounting structure of the insert member is characterized by having a flat portion.

  According to the first aspect of the present invention, in the insert member mounting structure in which at least a part of the insert member is embedded and attached to the outer wall of the blow molded product, the insert member has a flange portion projecting in the width direction on the outer surface of the cylindrical portion. The flange portion is embedded in the outer wall of the blow molded product. For this reason, by embedding a flange part in the outer wall of a blow molded product, a cylindrical part can be attached to a blow molded product and it can be set as the opening of a blow molded product. Through this opening, liquid or gas can be injected into the blow molded product or discharged from the inside.

  The insert member has a cylindrical portion that penetrates the outer wall of the blow molded product, and the cylindrical portion includes an outer cylindrical portion that protrudes outside the blow molded product and an inner cylindrical portion that protrudes inside the blow molded product. Have. For this reason, a cylindrical part can be attached to a blow molded product and it can be set as the opening of a blow molded product. Through this opening, liquid or gas can be injected into the blow molded product or discharged from the inside. The cylindrical part of the insert member has an outer cylindrical part protruding outside the blow molded product and an inner cylindrical part protruding inside the blow molded product, and the outer cylindrical part protrudes outside the blow molded product. Can attach hoses and tubes.

  The inner cylinder portion has a parison cut portion at the tip portion, and the parison cut portion forms a sharp tip portion that cuts the parison at the tip, and is one of the cylindrical walls of the inner tube portion on the root side with respect to the sharp tip portion. The part has a flat part. For this reason, by sliding the insert member in the mold during blow molding, the insert member can be attached by opening a hole in the parison at the sharpened tip of the parison tearing portion, and the attachment process is easy. The cut parison remains in the flat part provided in a part of the inner cylinder part without being parted, so that the parison does not adhere to the tip of the insert member, and the dimensions of the tip of the insert member can be controlled and managed. . And the torn parison can be made to be continuous with the part of the parison that forms the outer wall of the blow-molded product, and can be fused to the side surface of the flange part or the inner cylinder part of the insert member.

  According to the present invention of claim 2, the parison tearing portion is cut obliquely at the tip portion of the inner cylinder portion, the tip portion of the cut inner cylinder portion forms an acute-angled tip sharp portion. A cylindrical wall of the rear end portion of the inner cylindrical portion is an attachment structure for an insert member that forms a flat portion.

  In the present invention of claim 2, the parison tear portion is cut obliquely at the tip portion of the inner cylinder portion, the tip portion of the cut inner cylinder portion forms an acute-angled sharp tip portion. The cylindrical wall at the rear end portion of the inner cylindrical portion forms a flat portion. For this reason, it is possible to form the tip sharp portion at the tip of the parison tearing portion only by obliquely cutting the tip portion of the inner cylinder portion, the configuration of the parison tearing portion becomes simple, and the molding of the insert member becomes easy. . The parison is cut off at the sharp tip of the tip of the inner cylinder, and part of the cut parison is continuous with the parison that forms the outer wall of the blow molded product at the flat part. Since the parison can be held without being separated from other parisons, the torn parison can be reliably fused to the flange portion or the inner cylinder portion of the insert member.

  According to the third aspect of the present invention, the inner cylinder portion has a plurality of triangular parison cut portions at the tip portion, and the apex of the parison cut portion forms a tip sharp portion and is provided at the center portion of the inner tube portion. The hypotenuse part of the parison tearing part is provided so as to reach the cylinder wall at the tip of the inner cylinder part from the center part of the inner cylinder part, and the other sides of the plurality of parison tearing parts are mutually close to the center line of the inner cylinder part. It is an attachment structure of an insert member in which a flat portion is formed on a cylindrical wall of a distal end portion of an inner cylindrical portion which is integrally coupled and reaches an oblique side portion.

  In the present invention of claim 3, the inner cylinder portion has a plurality of triangular parison tear portions at the tip portion, and the apex of the parison tear portion forms a tip sharp portion and is provided at the center portion of the inner tube portion. It was. For this reason, the parison can be cut into a plurality of portions at the central portion of the inner cylinder portion, and the portion of the parison cut into the plurality of portions can be evenly fused around the insert member.

Because the hypotenuse part of the parison tearing part is provided so as to reach the cylindrical wall at the tip of the inner cylinder part from the center part of the inner cylinder part, the parison can be reliably torn to the outer periphery of the inner cylinder part at the hypotenuse part of the parison tearing part. it can.
The other sides of the plurality of parison cut portions were integrally connected to each other in the vicinity of the center line of the inner cylinder portion, and the flat portion was formed on the cylindrical wall at the tip of the inner cylinder portion where the hypotenuse portion reached, so that it was torn The parison can be left so that the remaining portion of the parison is continuous at the flat portion of the tip portion of the inner cylinder portion, and the portion of the parison that is torn can be evenly fused around the insert member.

  The present invention of claim 4 is an attachment structure of an insert member in which a part of a parison that forms an outer wall of a blow molded product cut by a parison cut portion is fused to a root portion of an inner cylinder portion.

  In this invention of Claim 4, since a part of parison which forms the outer wall of the blow-molded product cut | disconnected by the parison cut part fused | fused to the root part of the inner cylinder part, the root part of the inner cylinder part was cut | disconnected by the cut parison. And the inner cylinder portion can be stably held.

  The present invention of claim 5 is an attachment structure for an insert member in which a parison that forms an outer wall of a blow molded product cut by a parison cut portion is fused to a flange portion.

  In this invention of Claim 5, since the parison which forms the outer wall of the blow molded product cut | disconnected by the parison tear part melt | fused in a part of flange part, the flange part is firmly hold | maintained by a parison and insert member is attached. It can be firmly attached to the outer wall of the blow molded product.

  The present invention according to claim 6 is an attachment structure for an insert member in which a part of the flange portion forms a protruding portion, and at least a tip portion of the protruding portion is fused with a parison that forms an outer wall of a blow molded product. .

  In this invention of Claim 6, since the flange part formed the protrusion part and at least the front-end | tip part of the protrusion part melt | fused with the parison which forms the outer wall of a blow molded product, the front-end | tip of a protrusion part is a parison. Since it is easy to be heated and melted, it is fused with the parison, and after the parison is cured, it bites into and adheres to the flange cover portion or the inner cylinder cover portion, thereby improving the sealing performance. Further, since the protrusion is easily heated, the temperature for preheating the entire insert member can be lowered, or the preheating step can be omitted, and deformation due to a decrease in rigidity of the insert member can be prevented.

  According to the seventh aspect of the present invention, the flange portion forms a plurality of holes, and the parison is caused to flow into the plurality of holes at the time of blow molding so that both sides of the flange portion are covered with the parison. It is the attachment structure of the insert member clamped in.

  In this invention of Claim 7, a flange part forms a some hole, makes a parison flow in into a plurality of hole at the time of blow molding, covers both surfaces of a flange part with a parison, and a flange cover part after hardening of a parison I pinched it. For this reason, the parison that has flowed into the plurality of holes can firmly hold both sides of the flange portion, and both sides of the flange portion are fused with the parison, and after the parison is cured, it is sandwiched between the flange cover portions. The fusion area between the flange portion and the parison is increased, and the fusion strength is increased. Furthermore, after the parison is cured, the flange portion is embedded in the outer wall of the blow molded product and the flange portion is sandwiched by the flange cover portion, so that the flange portion can be further firmly held. Therefore, the insert member can be reliably held even when a load in the bending and rotation directions is applied to the cylindrical portion.

  According to the present invention of claim 8, the blow molded product is a fuel tank for automobiles, and the insert member is a tube attachment member for attaching a tube for injecting or discharging liquid or gas to or from the fuel tank for automobiles. This is the mounting structure.

  According to the present invention of claim 8, the blow molded product is a fuel tank for automobiles, and the insert member is a tube attachment member for attaching a tube for injecting or discharging liquid or gas to / from the fuel tank for automobiles. For this reason, the strength of the tube mounting member is improved, the tube is securely held, and the sealing performance between the fuel tank for an automobile and the tube mounting member is improved, thereby preventing leakage of fuel and fuel vapor. be able to.

  The inner cylinder portion of the insert member has a parison cut portion at the tip portion, and the parison cut portion forms a sharp tip portion that cuts the parison at the tip, and is a tube of the inner tube portion on the root side with respect to the sharp tip portion. A part of the wall has a flat part. For this reason, a hole can be made in a parison during blow molding, and an insert member can be attached. Since the parison does not adhere to the tip of the insert member, the dimensions of the tip of the insert member can be controlled and managed, and the cut parison remains in the flat part provided in a part of the inner cylinder part without being parted. The cut parison can be fused to the insert member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention and is a cross-sectional view of a portion where a tube mounting member of a fuel tank is attached. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a distal end portion of a tube attachment member of a fuel tank, showing a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention and is an enlarged sectional view of a flange portion of a tube attachment member of a fuel tank. The 2nd Embodiment of this invention is shown and it is sectional drawing of the part which attaches the tube attachment member of a fuel tank. The 3rd Embodiment of this invention is shown and it is sectional drawing of the tube attachment member of a fuel tank. The 3rd Embodiment of this invention is shown and it is a bottom view of the tube attachment member of a fuel tank. FIG. 4 is a partial cross-sectional view of a blow molding die in a state where the tube mounting member is attached to the fuel tank of the present invention, the tube mounting member is attached to the blow molding die, and the parison is in contact with the tube mounting member. . The process of attaching the tube mounting member to the fuel tank of the present invention is shown. The tube mounting member is mounted on the blow molding die, and after the parison abuts the tube mounting member, the parison is pierced by the tube mounting member. It is a partial cross section figure of a shaping die. It is sectional drawing of a fuel tank. It is sectional drawing of the attachment part of the tube attachment member of the conventional fuel tank.

The present invention will be described by taking as an example a mounting structure in which the tube mounting member 20 is mounted on the tank outer wall 2 of the fuel tank 1, but it is widely implemented also when the insert member is mounted on a blow molded product other than the fuel tank 1. Can do.
An embodiment of the present invention will be described with reference to FIGS.

First, a first embodiment will be described with reference to FIGS. 1 to 3 and 9.
FIG. 9 is a cross-sectional view of the fuel tank 1 in which the tube mounting member 20 mounting structure according to the first embodiment of the present invention is used. FIG. 1 is a cross-sectional view of a mounting structure in which a tube mounting member 20 that is an insert member of the first embodiment is mounted on a tank outer wall 2 of a fuel tank 1 that is a blow molded product. The manufacturing method according to the first embodiment will be described later with reference to FIGS.

As shown in FIG. 9, the fuel tank 1 is formed by blow molding, and the tank outer wall 2 is formed integrally. The tank outer wall 2 can be formed of one layer of thermoplastic synthetic resin, or can be formed to have a plurality of layers of thermoplastic synthetic resin.
When it is formed of a plurality of layers, it can be formed by combining a layer having rigidity and a layer having low fuel permeability.

  When formed with multiple layers, for example, the central layer is made of ethylene vinyl alcohol copolymer (EVOH) or nylon, and a barrier layer for preventing fuel permeation is formed from the modified polyethylene above and below the barrier layer. And an outer layer formed of high-density polyethylene (HDPE) on each outer surface of the adhesive layer.

  A tube attachment member 20 shown in FIG. 9 and a tank attachment portion 10 to which the tube attachment member 20 is attached are formed on the upper portion of the tank outer wall 2. The tube attachment member 20 is for attaching a filler tube for injecting fuel into the fuel tank 1 and a fuel pipe for supplying fuel from the fuel tank 1 to the engine.

A breather port mounting portion 7 is also formed on the upper portion of the tank outer wall 2. The breather port mounting portion 7 is for mounting a breather hose (not shown) for allowing the gas in the fuel tank 1 to escape outside the tank when fuel is supplied. Reference numeral 8 denotes a cut-off valve that prevents fuel leakage from the fuel tank 1 when the vehicle falls.
Note that a hose clamp for holding various hoses such as a fuel transfer hose may be provided on the upper surface of the tank outer wall 2. As with the tube mounting member 20, the present invention can be used for pipes and hose mounting members such as the breather port mounting portion 7 and the hose clamp.

  An opening 6 is further formed on the upper surface of the tank outer wall 2, and the sub tank 5 is attached to the inner surface of the lower portion of the tank outer wall 2 from the opening 6. The opening 6 is closed by a lid 60, and the lid 60 is screwed around the opening 6 by a lock plate 51. A seal ring 52 is attached between the opening 6 and the lid 60 to seal between the opening 6 and the lid 60.

  A fuel pump unit 4 is attached in the sub tank 5. The sub tank 5 is provided so that the fuel pump unit 4 can reliably send the fuel in the fuel tank 1 to the engine when the vehicle is tilted or vibrated. The fuel pump unit 4 is attached to the lid 60 and repair and maintenance are performed. A pipe extends from the fuel pump unit 4, and the fuel main port mounting portion 9 is connected to the lid body 60 at the upper part of the tank outer wall 2. A fuel pipe (not shown) for sending fuel to the engine is attached to the fuel main port attachment portion 9.

  As shown in FIG. 9, a tank mounting portion 10 is formed on the upper portion of the tank outer wall 2 of the fuel tank 1. The tank attachment portion 10 is formed when the fuel tank 1 is blow-molded on the tank outer wall 2 of the fuel tank 1 to which a tube attachment member 20 described later is attached. As will be described later, the tank mounting portion 10 is fused to the inner cylinder cover portion 11 which is fused to the tank inner cylinder portion 22 of the tube mounting member 20 and the flange hole portion 31 which will be described later. The flange cover filling portion 13 and the flange cover portion have a flange cover upper portion 14 fused to the outer surface of the flange portion 30 and a flange cover lower portion 15 fused to the inner surface of the flange portion 30.

Next, based on FIGS. 1-3, the tube attachment member 20 which is the 1st Embodiment of this invention is demonstrated.
The tube mounting member 20 is molded by injection molding separately from the fuel tank 1. As the material, a fuel oil-resistant thermoplastic synthetic resin is used. For example, a synthetic resin such as polyethylene, polypropylene, polyacetal, and polyamide can be used, but a blown parison 50 and a meltable material are used. .

  The tube attachment member 20 that is an insert member has a cylindrical portion that penetrates the tank outer wall 2 of the fuel tank 1 and a flange portion 30 that projects in the width direction on the outer surface of the cylindrical portion. The cylindrical portion includes a tank outer cylinder portion 21 that protrudes outside the tank outer wall 2 and a tank inner cylinder portion 22 that protrudes inside the tank outer wall 2. A tank outer cylinder ridge 21 a is formed on the outer periphery of the tank outer cylinder 21 in the vicinity of the flange 30. When the tube is inserted into the tank outer cylinder portion 21, the tank outer cylinder protrusion 21 a becomes a stopper at the tip of the tube and can hold the tube.

  The tank inner cylinder part 22 includes a tank inner cylinder part root part 23 close to the flange part 30 and a tank inner cylinder part protruding part 24 extending from the tank inner cylinder part root part 23 in the distal direction. The tank inner cylinder base portion 23 is formed thicker than the tank inner cylinder protrusion 24, and even if the tank inner cylinder protrusion 24 protrudes into the fuel tank 1, the tank inner cylinder protrusion 24 is strengthened. Can be held in. Moreover, even if the melted parison 50 is fused to the tank inner cylinder base 23, the tank inner cylinder root 23 is not deformed.

  The tank inner cylinder projecting portion 24 has a tip portion (portion indicated by A in FIG. 1) formed with a parison tearing portion 25 capable of tearing the parison 50 during blow molding described later. In the first embodiment, the tip portion of the tank inner cylinder protruding portion 24 is cut obliquely, and the cut tip portion forms an acute-angled parison tear portion 25.

  In the first embodiment, as shown in FIG. 2, the parison tearing portion 25 includes a tip sharp portion 27 that is formed into an acute angle by cutting the tip portion obliquely, and a tank inner cylinder portion that is cut obliquely. A flat portion 26 formed on the cylindrical wall of the tank inner cylinder protruding portion 24, formed at the rear end portion of the protruding portion 24, and a sharp end portion 27 and the flat portion 26, and continuously from the tank inner cylinder protruding portion 24. It is formed from the slope part 28 formed in the both sides of a cylinder wall.

  As will be described later, the parison 50 is cut by the sharp tip 27, and the parison 50 cut by the flat portion 26 is held in a state where a part thereof is not cut and connected to the parison 50 constituting the tank outer wall 2. Therefore, the cut parison 50 can be reliably fused to the flange portion 30 of the tube mounting member 20 or the tank inner cylinder base portion 23 without attaching the cut parison 50 to the parison tear portion 25. That is, as shown in FIG. 1, the parison 50 that has been torn by the sharp end portion 27 is not completely cut and is partially continuous, so it is fused to the outer surface of the tank inner cylinder root portion 23. The inner cylinder cover part 11 is configured.

As shown in FIG. 3, the flange portion 30 is formed so as to protrude in a disc shape on the outer periphery of the boundary portion between the tank outer cylinder portion 21 and the tank inner cylinder portion 22.
In the first embodiment of the present invention, a plurality of flange protrusions 34 are formed on the inner surface side of the flange 30. Therefore, at the time of blow molding, the flange protrusion 34 formed on the flange lower surface 35 that is the inner surface side of the flange 30 contacts the parison 50, and the tip of the flange protrusion 34 is melted by the heat of the parison 50. Thus, the flange protrusion 34 and the parison 50 are fused.
At this time, the parison 50 cut by the parison tearing portion 25 is fused to the tank inner cylinder root portion 23 and a part thereof is fused to the flange portion 30.

  Furthermore, after the parison 50 is hardened, the flange cover upper part 14 which is a part of the tank outer wall 2 formed of the parison 50 is formed on the flange upper surface portion 33 which is the outer surface side of the flange portion 30 in the tank mounting portion 10 portion. The flange lower surface portion 35 of the flange portion 30 can be covered with the flange cover lower portion 15, the flange portion 30 is embedded in the tank outer wall 2 of the fuel tank 1, and the flange portion is formed by the tank mounting portion 10 of the tank outer wall 2. Since the whole 30 is clamped, the flange portion 30 can be further firmly held. Therefore, the tube mounting member 20 can be reliably held even when a load such as a bending or rotating direction is applied to the tank outer cylinder portion 21 from the outside.

  Since the flange protrusion 34 is fused to the parison 50, the flange lower surface portion 35 and the flange cover lower portion 15 are firmly fixed, and the sealing performance between the flange lower surface portion 35 and the flange cover lower portion 15 is improved. The fuel vapor or the like does not leak from between the tube mounting member 20 and the tank outer wall 2. One or a plurality of flange protrusions 34 can be formed.

  When a plurality of flange protrusions 34 are circumferentially formed on the flange lower surface part 35, the plurality of flange protrusions 34 of the flange lower surface part 35 are fused to the parison 50, and the flange lower surface part After the parison 50 is fixed and the parison 50 is cured, the sealing performance between the flange lower surface portion 35 and the flange cover lower portion 15 is improved.

  The flange portion 30 can be formed with a plurality of flange hole portions 31 evenly in a circumferential shape. When the flange hole 31 is formed, the parison 50 is caused to flow into the flange hole 31 at the time of blow molding, and both sides of the flange 30 are fused with the parison 50, and after the parison 50 is cured, it flows in. The parison 50 becomes the flange hole filling portion 13 and is fused and sandwiched by the tank outer wall 2.

  At this time, a part of the parison 50 cut by the parison cut portion 25 can also flow into the flange hole portion 31. The flange hole 31 can be formed in a circular shape, and can be formed in a large number of three or more. The flange hole portion 31 allows the parison 50 to flow into both surfaces of the flange portion 30, so that the flange cover upper portion 14 and the flange cover lower portion 15 can easily hold the flange portion 30.

  Therefore, the parison 50 that has flowed into the flange hole portion 31 can cover both surfaces of the flange portion 30, and the parison 50 that covers both surfaces is connected by the parison 50 existing in the flange hole portion 31. Since both sides of the flange portion 30 are fused and sandwiched by the parison 50, the fusion area between the flange portion 30 and the parison 50 increases, and the tank outer wall 2 and the parison 50 are fused. Strength increases.

  The tube mounting member 20 can be formed with a flange recess 32 in which the parison 50 enters the circumference in the vicinity of the root on the outer surface side of the flange portion 30. In this case, at the time of blow molding, the parison 50 can be reliably wound up to the flange concave portion 32 at the base of the flange portion 30. Therefore, the front end portion of the parison 50 in the portion of the flange concave portion 32 that wraps around the outer surface side of the flange portion 30 is held by the flange concave portion 32, and after the parison 50 is cured, the base of the flange portion 30 is surely secured by the tank outer wall 2. Can be firmly clamped.

Next, based on FIG. 4, the tube attachment member 20 which is the 2nd Embodiment of this invention is demonstrated.
The tube mounting member 20 of the second embodiment is different because the tank inner cylinder portion 22 is formed with a dimension shorter than that of the first embodiment, and other portions are the same as those of the first embodiment. Only the part will be described, and the description of the equivalent part will be omitted.

In the tank inner cylinder part 22 of the tube mounting member 20 of the second embodiment, both the tank inner cylinder part base part 23 and the tank inner cylinder part projecting part 24 are formed shorter than the first embodiment. However, the tank inner cylinder protruding portion 24 is particularly short. In addition, the shape of the parison tearing portion 25 formed at the tip of the tank inner cylinder protruding portion 24 is the same as that of the first embodiment. This is because the dimensions of the tank inner cylinder portion 22 are appropriately adjusted according to the internal structure of the fuel tank 1. Therefore, the tank inner cylinder part 22 can also be formed longer than 1st Embodiment.
Also in this case, the parison 50 that has been cut by the parison tearing portion 25 is fused to the tank inner tube root portion 23 to form the inner tube cover portion 11.

Next, based on FIG. 5 and FIG. 6, the tube attachment member 20 which is the 3rd Embodiment of this invention is demonstrated.
The tube mounting member 20 of the third embodiment is different from the first embodiment in the shape of the parison tearing portion 25 formed at the tip of the tank inner cylinder protruding portion 24, and the other portions are the first embodiment. Therefore, only different parts will be described and description of equivalent parts will be omitted.

  As shown in FIG. 6, in the third embodiment, the parison tearing portion 25 has four parison tearing portions 25 at the tip portion. In addition to four sheets, other plural sheets such as three sheets or five sheets can be used. As shown in FIG. 5, the one parison cut portion 25 is formed in a right triangle shape, the tip forms a tip sharpened portion 27, the slope forms a slope portion 28, and the intersection of the slope and the bottom is a tank. The cylindrical wall forms a flat portion 26 integrally with the cylindrical wall at the tip of the inner cylindrical protrusion 24.

  In the vertical side portion, the four parison cut portions 25 are integrally connected to each other, and the connecting portion is located on the center line of the tank inner cylinder projecting portion 24 so that the tip ends of the four parison cut portions 25 are formed. The sharp end portions 27 are also integrally connected to each other on the center line. For this reason, the parison 50 can be cut into four parts at the center part of the tank inner cylinder protruding part 24.

  The parison 50 that has been cut by the sharp edge portion 27 is further cut by the inclined surface portion 28 of the parison cut portion 25 and the parison 50 is surely cut to the outer periphery of the inner cylinder portion, and four pieces of the parison 50 that have been cut by the plane portion 26 are obtained. It becomes. Then, the cut parison 50 can be made continuous with the other part of the tank outer wall 2 of the parison 50 at the flat surface portion 26 at the tip end portion of the tank inner cylinder protruding portion 24. These portions can be evenly fused to the tank inner cylinder base portion 23 and the flange portion 30.

Next, based on FIG. 7 and FIG. 8, the method to attach the tube attachment member 20 which is an insert member to the tank outer wall 2 of the fuel tank 1 which is a blow molded product is demonstrated.
In order to attach the tube mounting member 20 to the tank outer wall 2, it is attached simultaneously with the blow molding of the fuel tank 1 using the blow molding die 40 for molding the fuel tank 1.

  In order to attach the tube mounting member 20 to the tank outer wall 2, an insert holding portion 42 for fitting the tank outer cylinder portion 21 of the tube mounting member 20 is formed in the blow molding die 40, and the insert holding portion 42 is blow molded. It is attached to a slide core 43 that moves forward and backward with respect to the cavity surface 41 of the mold 40. When the tube attachment member 20 is attached, the slide core 43 is retracted from the cavity surface 41, and the tip of the parison tearing portion 25 of the tube attachment member 20 is also retracted from the cavity surface 41.

  Next, as shown in FIG. 7, a parison 50 that forms the tank outer wall 2 of the fuel tank 1 is introduced into the blow molding die 40. The parison 50 comes into contact with the cavity surface 41 of the blow molding die 40. At this time, the tank inner cylinder portion 22 of the tube mounting member 20 is not in contact with the parison 50 because it is retracted from the cavity surface 41.

Thereafter, as shown in FIG. 8, the slide core 43 moves, the parison tearing portion 25 of the tube mounting member 20 tears the parison 50, and the slide core 43 further moves, so that the flange portion 3 of the tube mounting member 20 moves. It moves until it is buried inside the parison 50.
Then, the tank inner cylinder portion 22 breaks through the parison 50 and reaches the inside of the tank outer wall 2.

  Thereafter, air is blown into the interior of the parison 50 and the parison 50 is pressed against the cavity surface 41 of the blow molding die 40. Then, since the parison 50 is in a molten state, the parison 50 and the tank inner cylinder portion 22 are fused and also fused to the flange portion 30. A portion of the parison 50 that has been cut by the parison tearing portion 25 is fused to the tank inner tube base portion 23 of the tank inner tube portion 22 to form the inner tube cover portion 11 and the flange portion 30. Fused to a part of The parison 50 embeds the flange portion 30, the parison 50 enters the flange hole portion 31, and the parison 50 is fused to the flange portion 30.

  Therefore, the inner surface side of the flange portion 30 and the flange cover lower portion 15 are firmly fixed, and the sealing performance between the inner surface side of the flange portion 30 and the flange cover lower portion 16 is improved. Fuel vapor or the like does not leak from between the outer wall 2. One or a plurality of flange protrusions 34 can be formed.

  Further, after the parison 50 is hardened, the flange upper surface portion 33 of the flange portion 30 can be covered with the flange cover upper portion 14 and the flange lower surface portion 35 can be covered with the flange cover lower portion 16 in the tank mounting portion 10. Since the portion 30 is embedded in the tank outer wall 2 of the fuel tank 1 and the entire flange portion 30 is clamped by the tank mounting portion 10 of the tank outer wall 2, the flange portion 30 can be further firmly held. Therefore, the tube mounting member 20 can be reliably held even when a load such as a bending or rotating direction is applied to the tank outer cylinder portion 21 from the outside.

After blow molding, the slide core 43 moves backward leaving the tube mounting member 20 in the tank outer wall 2.
Then, the parison 50 is hardened, and the parison 50 that is torn at the parison tearing portion 25 is fused to the vehicle interior holding lip root portion 41 to form the inner cylinder cover portion 11, and the flange portion 30 is attached to the flange cover from both sides. The upper part 14 and the flange cover lower part 15 are connected by the flange hole filling part 13 and can be sandwiched to hold the tube mounting member 20 firmly.
Thereafter, the fuel tank 1 is taken out from the blow molding die 40, and the blow molding is completed.
In this way, the tube attachment member 20 can be attached to the tank outer wall 2 simultaneously with the blow molding of the fuel tank 1.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Tank outer wall 10 Tank attachment part 20 Tube attachment member 21 Tank outer cylinder part 22 Tank inner cylinder part 25 Parison tear part 30 Flange part 40 Blow molding die 50 Parison

Claims (8)

In the insert member mounting structure in which at least a part of the insert member is embedded in the outer wall of the blow molded product,
The insert member has a cylindrical portion penetrating the outer wall of the blow molded product and a flange portion projecting in the width direction on the outer surface of the cylindrical portion, and the flange portion is embedded in the outer wall of the blow molded product. The cylindrical part has an outer cylindrical part projecting outside the blow molded product and an inner cylindrical part projecting inside the blow molded product,
The inner cylindrical portion has a parison cut portion at the tip portion, and the parison cut portion forms a sharp tip portion that cuts the parison at the tip, and the inner cylindrical portion at the root side of the sharp tip portion. A mounting structure for an insert member, wherein a part of the wall has a flat portion.   The parison tearing portion is formed by obliquely cutting the tip portion of the inner cylinder portion, forming the sharp tip portion with the sharp tip portion of the cut inner cylinder portion, and cutting the inner cylinder portion obliquely. The mounting structure for an insert member according to claim 1, wherein a cylindrical wall of a rear end portion forms the flat portion.   The inner cylinder part has a plurality of triangular parison tears at the tip part, and the apex of the parison tear part forms the tip sharp part and is provided at the center part of the inner cylinder part, and the parison tears The hypotenuse part of the inner cylinder part is provided so as to reach the cylinder wall of the tip part of the inner cylinder part from the center part of the inner cylinder part, and the other sides of the plurality of parison tear parts are near the center line of the inner cylinder part. The insert member mounting structure according to claim 1, wherein the planar portion is formed on a cylindrical wall of a distal end portion of the inner cylindrical portion that is integrally coupled with each other and reaches the oblique side portion.   The insert member according to any one of claims 1 to 3, wherein a part of a parison that forms an outer wall of the blow-molded product cut by the parison tear portion is fused to a root portion of the inner cylinder portion. Mounting structure.   The mounting structure of the insert member according to any one of claims 1 to 4, wherein a parison forming an outer wall of the blow molded product cut by the parison cut portion is fused to a part of the flange portion. .   The said flange part forms a protrusion part, The at least front-end | tip part of this protrusion part fuse | melted with the parison which forms the outer wall of the said blow molded product. Insert member mounting structure.   The flange portion is formed with a plurality of holes, and a parison is caused to flow into the plurality of holes during blow molding, and both sides of the flange portion are fused and sandwiched by a parison that forms the outer wall of the blow molded product. The mounting structure for an insert member according to any one of claims 1 to 6.   8. The blow molded product is an automobile fuel tank, and the insert member is a tube attachment member for attaching a tube for injecting or discharging liquid or gas to or from the automobile fuel tank. The attachment structure of the insert member as described in any one of these.

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