US20020017527A1 - Opening structure of a fuel tank - Google Patents
Opening structure of a fuel tank Download PDFInfo
- Publication number
- US20020017527A1 US20020017527A1 US09/921,599 US92159901A US2002017527A1 US 20020017527 A1 US20020017527 A1 US 20020017527A1 US 92159901 A US92159901 A US 92159901A US 2002017527 A1 US2002017527 A1 US 2002017527A1
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- Prior art keywords
- opening
- fuel tank
- compressed
- annular member
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
- B60K2015/03447—Arrangements or special measures related to fuel tanks or fuel handling for improving the sealing
Definitions
- the present invention relates to an opening structure of a fuel tank, more particularly the opening structure of the fuel tank for use in an automotive vehicle. Also, the present invention relates to a method for producing the fuel tank by forming a fuel tank wall with a plurality of plastic layers through blow molding, and forming an opening portion to be integral with the fuel tank wall.
- a fuel tank mounted on an automobile or the like is likely to be made from plastic material.
- getting popular now is a method for forming a fuel tank by the plastic material through blow molding, and forming an opening portion to be integral with the fuel tank wall.
- a plastic fuel tank having an opening portion of a desired structure is getting popular.
- the structure of the opening portion of the fuel tank as described above is disclosed in Japanese Utility-model Laid-open Publication No. 4-7925, for example.
- FIG. 3 of that Publication disclosed is a prior structure, and in FIG. 1, a proposed structure for restraining the height of an opening peripheral wall of the fuel tank.
- engaging portions such as nuts are disposed on a base portion for mounting a cover member thereon, and engaging parts such as bolts are engaged with the engaging portions to secure the cover member to a fuel tank body, or fuel tank wall, so that a sufficient capacity can be obtained in a condition of a limited total height.
- engaging parts such as nuts are disposed on a base portion for mounting a cover member thereon, and engaging parts such as bolts are engaged with the engaging portions to secure the cover member to a fuel tank body, or fuel tank wall, so that a sufficient capacity can be obtained in a condition of a limited total height.
- a plastic member having a plurality of layers is disclosed in Japanese Utility-model Laid-open Publication No. 61-83509, for example.
- a blow molded fuel tank with multiple layers employing multiple plate members with a plurality of component plates adhered together through binding layers.
- a plastic member having a plurality of layers is employed.
- This plastic member includes a strength holding member such as high density polyethylene for holding the strength of the fuel tank, a barrier member for protecting the fuel from passing through it, and binding material or the like for binding them.
- a strength holding member such as high density polyethylene for holding the strength of the fuel tank
- a barrier member for protecting the fuel from passing through it
- binding material or the like for binding them.
- an opening structure of a fuel tank having a fuel tank wall made of a plurality of plastic layers with an opening portion formed to be integral with the fuel tank wall.
- the opening structure includes a cylindrical portion extended from the opening portion outward of the fuel tank wall, an overlapping portion extended from an end of the cylindrical portion to enlarge the diameter of the opening portion and bent at a bent portion to form an outer surface parallel with an opening end surface of the opening portion, and a compressed portion with at least a portion of the overlapping portion compressed in a direction perpendicular to the opening end surface of the opening portion.
- the opening structure of the fuel tank may further include an annular member disposed around the opening portion to be in contact with the overlapping portion and the cylindrical portion.
- the compressed portion may provide an annular groove placed outward or inward of the opening portion in a radial direction of the cylindrical portion.
- the plastic layers includes at least an outer layer, an inner layer and an intermediate layer, and the outermost end of the intermediate layer is positioned at the compressed portion.
- an annular member Preferably disposed around the opening portion is an annular member with a step portion formed inward of the annular member in a radial direction thereof to contact with at least the compressed portion.
- the bent portion may be formed with a lifted wall portion extending parallel with the side surface of the cylindrical portion.
- a method for producing a fuel tank by forming a fuel tank wall with a plurality of plastic layers through blow molding, and forming an opening portion to be integral with the fuel tank wall may include the steps of forming a cylindrical portion extended from the opening portion outward of the fuel tank wall, when the fuel tank wall is formed by blow molding, forming at least a potion of the cylindrical portion to be bulged outward thereof in a radial direction thereof, to provide a bulged portion, pressing the bulged portion to form a bent portion bent at the outward of the opening portion in a radial direction thereof, to form an overlapping portion extended from an end of the cylindrical portion to form an outer surface parallel with an opening end surface of the opening portion, and compressing at least a portion of the overlapping portion to be compressed, to produce a compressed portion.
- the compressed portion may be formed outward of the opening portion in a radial direction of the cylindrical portion. Or, it may be formed inward of the opening portion in a radial direction of the cylindrical portion.
- the plastic layers may include at least an outer layer, an inner layer and an intermediate layer, and the outermost end of the intermediate layer may be positioned at the compressed portion.
- annular member having a step portion formed inward of the annular member in a radial direction thereof to contact with at least the compressed portion may be disposed around the opening portion.
- FIG. 1 is a cross sectional view of a part of an opening structure of a fuel tank according to an embodiment of the present invention
- FIG. 2 is an enlarged cross sectional view of a part of the opening structure of the fuel tank according to an embodiment of the present invention
- FIG. 3 is a plan view of an annular member for use in the opening structure of the fuel tank according to an embodiment of the present invention
- FIG. 4 is a cross sectional view of an annular member for use in the opening structure of the fuel tank according to an embodiment of the present invention
- FIG. 5 is a cross sectional view illustrating a bulging step for forming the opening structure of the fuel tank according to an embodiment of the present invention
- FIG. 6 is a cross sectional view illustrating a compressing step for forming the opening structure of the fuel tank according to an embodiment of the present invention
- FIG. 7 is an enlarged cross sectional view of a part of an opening structure of a fuel tank according to another embodiment of the present invention.
- FIG. 8 is an enlarged cross sectional view of a part of an opening structure of a fuel tank according to a further embodiment of the present invention.
- FIG. 9 is an enlarged cross sectional view of a part of an opening structure of a fuel tank according to a yet further embodiment of the present invention.
- FIG. 10 is a cross sectional view of an opening structure of a fuel tank according to a yet further embodiment of the present invention.
- FIG. 11 is an enlarged cross sectional view of a part of the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 12 is an enlarged cross sectional view of another example of a part of the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 13 is a plan view of the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 14 is an enlarged cross sectional view of a part of a die for forming the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 15 is a cross sectional view illustrating a bulging step for forming the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 16 is a cross sectional view illustrating a compressing step for forming the opening structure according to the embodiment as shown in FIG. 10.
- FIG. 1 there is illustrated an opening structure of a fuel tank according to an embodiment of the present invention, a part of which is sectioned and enlarged in FIG. 2.
- a fuel tank wall 1 is formed with a plastic member having a plurality of layers through blow molding, and an opening portion 1 h is formed integrally with the fuel tank wall 1 . A method for producing it will be explained later.
- FIGS. 1 and 2 in the vicinity of the opening portion 1 h, there are formed a cylindrical portion 1 e which is extended from the opening portion 1 h outward of the fuel tank wall 1 , and an overlapping portion 1 d which is extended from an end of the cylindrical portion 1 e to enlarge the diameter of the opening portion 1 h and bent at a bent portion 1 b to form an outer surface parallel with an opening end surface Sh of the opening portion 1 h. And, at least a portion of the overlapping portion 1 d is compressed in a direction perpendicular to the opening end surface Sh of the opening portion 1 h, to form a compressed portion 1 c.
- FIG. 1 hatching to the plastic member constituting the fuel tank wall 1 is omitted to show the structure clearly.
- the plastic member constituting the fuel tank wall 1 is the one with multiple layers, that includes an outer layer Po and an inner layer Pi, both of which are formed by the strength holding member, and an intermediate layer B which is formed with the barrier material and disposed between them, to be bound together by adhesive plastics.
- the strength holding member employed in the present embodiment ultra high polymeric (high density) polyethylene is used.
- the barrier material EVOH (i.e., plastic with ethylene and vinyl-alcohol co-polymerized) is used, for example.
- the materials are not limited to those as described above, but may be employed any materials which can protect the fuel of gasoline or the like from being passed, to provide effective gas-barrier property.
- the bent portion 1 b is bent inward (toward the opening) as shown in FIG. 2, so that even if the fuel passed through the inner layer Pi, it could be blocked by the intermediate layer B at the bent portion 1 b, effectively.
- the compressed portion 1 c is formed to provide an annular groove, where the thickness of the outer layer Po is formed relatively thin, comparing with the thickness at the cylindrical portion 1 e .
- the thickness of the outer layer Po is formed to be thin at the compressed portion 1 c, so that the passage has been made narrow, thereby to provide a resistance when the fuel is introduced from an opening end surface 1 p.
- the opening end surface (corresponding to “ 1 p” in FIG. 2) of the plastic member with multiple layers can be directly communicated with the outer space. Therefore, even in the case where a seal member (not shown) was disposed between a cover member 4 and an annular fixing member 5 , the fuel might pass through the outer layer Po. Theoretically, some fuel might be introduced from the opening end surface 1 p to pass through the thin portion of the compressed portion 1 c , and reach the bent portion 1 b, according to the present embodiment, but the amount of fuel is so small as to be substantially negligible.
- annular member 2 is placed to surround the opening portion 1 h, and fixed to the same with its inner side abutting on the outer side surface of the cylindrical portion 1 e, and with its top end surface abutting on the lower surface of the overlapping portion 1 d.
- the annular member 2 is made of plastic, with a c-shaped cross section opened to the outside in a radial direction, and formed as shown in FIGS. 3 and 4. That is, a recess 2 r is formed around its outer periphery, and opposite end surfaces in its axial direction are formed to be parallel with each other.
- the annular member 2 is formed with a threaded portion 2 s, on its outer side surface at its upper portion.
- the annular member 2 is formed with a plurality of communication holes 2 c opened in the axial direction, around its whole periphery.
- the annular member 2 is placed so as to surround the opening portion 1 h, and abut on the cylindrical portion 1 e and the overlapping portion 1 d, so that it is bound with the outer layer Po in a body.
- the plastic material is introduced into the communication holes 2 c, so that the annular member 2 is secured to the cylindrical portion 1 e not to rotate relative thereto.
- the outer layer Po is extended to cover a portion of the outer peripheral end of the annular member 2 , to form an engaging portion 1 f.
- the opening portion 1 h as constituted above has the compressed portion 1 c to provide an annular groove, which receives a sealing member 3 made of rubber or the like as shown in FIG. 1. Therefore, after the cover member 4 is placed on the sealing member 3 , the fixing member 5 having a threaded portion inside thereof is mounted on the cover member 4 , and engaged with the threaded portion 2 s of the annular member 2 . Consequently, the cover member 4 is tightly fixed to the upper surface of the overlapping portion 1 d through the sealing member 3 . When the fixing member 5 is screwed, the annular member 2 is not rotated, because the annular member 2 is secured to the cylindrical portion 1 e not to rotate relative thereto.
- portions through which the fuel in the tank may be communicated with the outside of the tank are only the portions where the sealing member 3 abuts on the cover member 4 and overlapping portion 1 d, and the portion where the outer layer Po out of the multiple layers was formed relatively thin, when the compressed portion 1 c was formed.
- the fuel is effectively prevented from passing through the opening portion of the fuel tank wall 1 .
- a good sealing property can be ensured, because a profile irregularity has been improved to provide a smooth surface on the bottom surface of the compressed portion 1 c.
- FIGS. 5 and 6 illustrate an example of a process for producing the fuel tank having the opening structure as described above.
- a multi-layer parison PT placed between dies D 1 and D 2 is a multi-layer parison PT made of the plastic member with multiple layers.
- the die D 1 is supported to move perpendicularly to the die D 2 .
- the dies D 1 and D 2 are formed insides thereof with a protrusion D 1 p and a recess D 2 r, respectively.
- the protrusion D 1 p is formed to provide the compressed portion 1 c as shown in FIG. 2, and the recess D 2 r is formed to receive the annular member 2 .
- a spacer SP is disposed to move back and forth perpendicularly to the axis of the die D 1 (i.e., the axis of the opening portion 1 h ).
- the spacer SP is adapted to hold the annular member 2 within the recess 2 r of the annular member 2 in a pressing process.
- the spacer SP is adapted to move perpendicularly to the axis of the die D 1 in accordance with a movement of the die D 1 .
- the air pressure or hydraulic pressure is supplied into the multi-layer parison PT through a conduit (not shown).
- the die D 1 is moved relative to the die D 2 toward the annular member 2 .
- the spacer SP is moved in the direction perpendicular to the axis of the die D 1 , and held in the recess 2 r of the annular member 2 .
- the multi-layer parison PT is bulged outwardly as shown in FIG. 5, while the portion abutting on the annular member 2 is restricted from being bulged outwardly to form the cylindrical portion 1 e.
- the bent portion 1 b and the overlapping portion 1 d are formed accurately, as shown in FIG. 6. Also, the overlapping portion id is compressed by the protrusion D 1 p of the die D 1 to form the compressed portion 1 c . At the same time, formed is a cover portion 1 g as shown in FIG. 6, which will be removed later.
- FIG. 7 illustrates the opening structure of the fuel tank according to another embodiment of the present invention, wherein all of the overlapping portion 1 d is compressed to form the overlapping portion 1 d as a whole into the compressed portion.
- the profile irregularity of the outer surface (upper surface in FIG. 7) of the overlapping portion id is improved to provide a smooth surface, so that a good sealing property can be obtained.
- the profile irregularity of the lower surface of the cover member 4 is proper, a good sealing property can be obtained without any sealing member.
- FIG. 8 illustrates the opening structure of the fuel tank according to a further embodiment of the present invention, wherein the annular member 2 is formed on its upper surface with a protrusion 2 t, so that when the overlapping portion 1 d is compressed, a compressed portion 1 cu is formed on its lower surface.
- thickness of the outer layer Po is made thinner at the compressed portion 1 cu to narrow the passage, whereby the resistance is applied to the fuel when introduced from the opening end surface 1 p.
- the profile irregularity of the outer surface (upper surface in FIG. 8) of the overlapping portion 1 d above the compressed portion 1 cu is improved to provide a smooth surface, so that a good sealing property can be obtained.
- FIG. 9 illustrates the opening structure of the fuel tank further modified to the embodiment as shown in FIG. 8, wherein the cover portion 1 g remained after the forming process can be removed easily.
- a compressed portion 1 ci is formed on the overlapping portion 1 d at the inner side of the opening portion 1 h in its radial direction.
- FIGS. 10 - 16 wherein the outermost end of the intermediate layer B is positioned at the compressed portion 1 c.
- the elements which are substantially the same as those shown in FIGS. 1 - 9 are designated by the same reference numerals as the numerals in FIGS. 1 - 9 .
- the fundamental structure of the present embodiment is substantially the same as that shown in FIGS.
- the outermost end of the intermediate layer B is positioned at a compressed portion 11 c.
- a lifted wall portion 11 k is formed to extend from a bent portion 11 b in parallel with the side surface of a cylindrical portion 11 e. Consequently, an annular groove is formed on the compressed portion 11 c inside of the lifted wall portion 11 k.
- a step which is formed when the wall 11 is compressed, without forming the lifted wall portion 11 k, may serve as the compressed portion 11 c to open outward.
- the annular member 12 is placed to surround the opening portion 11 h made of the plastic member forming the fuel tank wall 11 , and fixed to the same.
- the annular member 12 is made of plastic, with its inner side abutting on the outer side surface of the cylindrical portion 11 e, and with its upper end surface abutting on the lower surface of the overlapping portion 11 d. And, the annular member 12 is formed at its inside with a step portion 12 d to abut on the bent portion 11 b (and the lifted wall portion 11 k as shown in FIG. 11 in this embodiment).
- the annular member 12 is formed at its outside with a threaded portion 12 s, and formed with a recess 12 r on one end surface in its axial direction (i.e., lower end surface as shown in FIG. 11).
- the compressed portion 11 c provides an annular groove, which receives the sealing member 3 as shown in FIG. 11. Therefore, after the cover member 4 is placed on the sealing member 3 , the annular fixing member 15 having a threaded portion inside thereof is mounted on the cover member 4 , and engaged with the threaded portion 12 s of the annular member 12 . Consequently, the cover member 4 is tightly fixed to the upper surface of the compressed portion 11 c through the sealing member 3 .
- portions through which the fuel in the tank may be communicated with the outside of the tank are only the portions where the sealing member 3 abuts on the cover member 4 and compressed portion 11 c, and the portion where the outer layer Po out of the multiple layers was formed relatively thin, when the compressed portion 11 c was formed, and particularly, the outermost end of the intermediate layer B is positioned at a compressed portion 11 c, so that a passage is formed narrow.
- the fuel is effectively prevented from passing through the opening portion of the fuel tank 11 .
- a good sealing property can be ensured, because a profile irregularity has been improved to provide a smooth surface on the bottom surface of the compressed portion 11 c.
- FIG. 14 illustrates dies for use in producing the fuel tank having the opening structure as shown in FIGS. 10 and 11, and FIGS. 15 and 16 illustrate an example of the process for producing it.
- structural elements of dies equivalent to those described originally are designated by corresponding reference numerals with (o) following them.
- a die D 1 o is supported to move vertically, while a die D 2 o is supported to move horizontally.
- the dies D 1 o and D 2 o are formed insides thereof with a protrusion D 1 po and a recess D 2 ro, respectively.
- the protrusion D 1 po is formed to provide the compressed portion 11 c as shown in FIG. 11, and the recess D 2 ro is formed to receive the threaded portion 12 s of the annular member 12 .
- the formed or finished opening portion 11 h of the fuel tank wall 11 is shown.
- the multi-layer parison PT made of the plastic member with multiple layers (three layers in this embodiment). And, it is so arranged that the air pressure or hydraulic pressure is supplied into the multi-layer parison PT. Accordingly, with the air pressure or hydraulic pressure introduced into the multi-layer parison PT, the die D 1 o is moved relative to the die D 2 o toward the annular member 12 as indicated by a blank arrow in FIG. 15. As a result, the multi-layer parison PT is bulged outwardly as shown in FIG.
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Abstract
Description
- This application claims priorities under 35 U.S.C. Sec. 119 to Nos. 2000-237980 and 2001-153250 filed in Japan on Aug. 7, 2000 and May 22, 2001, respectively, the entire contents of which are herein incorporated by reference.
- 1. Field of the Invention
- The present invention relates to an opening structure of a fuel tank, more particularly the opening structure of the fuel tank for use in an automotive vehicle. Also, the present invention relates to a method for producing the fuel tank by forming a fuel tank wall with a plurality of plastic layers through blow molding, and forming an opening portion to be integral with the fuel tank wall.
- 2. Description of the Related Arts
- Recently, a fuel tank mounted on an automobile or the like is likely to be made from plastic material. For example, getting popular now is a method for forming a fuel tank by the plastic material through blow molding, and forming an opening portion to be integral with the fuel tank wall. As a result, a plastic fuel tank having an opening portion of a desired structure is getting popular. The structure of the opening portion of the fuel tank as described above is disclosed in Japanese Utility-model Laid-open Publication No. 4-7925, for example. In FIG. 3 of that Publication, disclosed is a prior structure, and in FIG. 1, a proposed structure for restraining the height of an opening peripheral wall of the fuel tank. According to the Publication, it is described that engaging portions such as nuts are disposed on a base portion for mounting a cover member thereon, and engaging parts such as bolts are engaged with the engaging portions to secure the cover member to a fuel tank body, or fuel tank wall, so that a sufficient capacity can be obtained in a condition of a limited total height. Also disclosed in Japanese Patent No. 2906701 is the structure similar to that disclosed in the above Publication as a prior art.
- With respect to the plastic material forming the fuel tank, a plastic member having a plurality of layers is disclosed in Japanese Utility-model Laid-open Publication No. 61-83509, for example. In this Publication, disclosed is a blow molded fuel tank with multiple layers, employing multiple plate members with a plurality of component plates adhered together through binding layers.
- When the plastic made fuel tank is produced as disclosed in the above Publication No. 61-83509, a plastic member having a plurality of layers is employed. This plastic member includes a strength holding member such as high density polyethylene for holding the strength of the fuel tank, a barrier member for protecting the fuel from passing through it, and binding material or the like for binding them. By forming that plastic member through a blow molding method, the fuel tank is produced, together with its opening portion formed simultaneously. When the opening portion is covered by the cover member as disclosed in the aforementioned Publication, the end surface of the opening portion with a plurality of layers may be exposed inside of the fuel tank. In this case, therefore, the fuel might be leaked from the strength holding member of the outermost layer of the plastic member. In the Publication No. 4-7925 as described above, it is proposed to connect them by means of a connecting member such as a bolt or the like, with a packing disposed between them. When connecting the cover member with the fuel tank, however, the bolt and the packing of high sealing property will be needed. In this case, even if the packing with a good anti-passing property is employed, there might be caused the leak of fuel through the outermost layer of the plastic member.
- Accordingly, it is an object of the present invention to provide an opening structure of a fuel tank having a fuel tank wall made of a plurality of plastic layers, to protect the fuel from passing through the plastic member at an opening portion of the fuel tank, effectively.
- It is another object of the present invention to provide a method for forming a fuel tank wall with a plurality of plastic layers through blow molding, and forming an opening portion to be integral with the fuel tank wall, to produce a fuel tank having an opening structure to protect the fuel from passing through the plastic member, effectively.
- In accomplishing the above and other objects, an opening structure of a fuel tank having a fuel tank wall made of a plurality of plastic layers with an opening portion formed to be integral with the fuel tank wall. The opening structure includes a cylindrical portion extended from the opening portion outward of the fuel tank wall, an overlapping portion extended from an end of the cylindrical portion to enlarge the diameter of the opening portion and bent at a bent portion to form an outer surface parallel with an opening end surface of the opening portion, and a compressed portion with at least a portion of the overlapping portion compressed in a direction perpendicular to the opening end surface of the opening portion.
- The opening structure of the fuel tank may further include an annular member disposed around the opening portion to be in contact with the overlapping portion and the cylindrical portion.
- The compressed portion may provide an annular groove placed outward or inward of the opening portion in a radial direction of the cylindrical portion.
- Preferably, the plastic layers includes at least an outer layer, an inner layer and an intermediate layer, and the outermost end of the intermediate layer is positioned at the compressed portion.
- Preferably disposed around the opening portion is an annular member with a step portion formed inward of the annular member in a radial direction thereof to contact with at least the compressed portion.
- The bent portion may be formed with a lifted wall portion extending parallel with the side surface of the cylindrical portion.
- A method for producing a fuel tank by forming a fuel tank wall with a plurality of plastic layers through blow molding, and forming an opening portion to be integral with the fuel tank wall may include the steps of forming a cylindrical portion extended from the opening portion outward of the fuel tank wall, when the fuel tank wall is formed by blow molding, forming at least a potion of the cylindrical portion to be bulged outward thereof in a radial direction thereof, to provide a bulged portion, pressing the bulged portion to form a bent portion bent at the outward of the opening portion in a radial direction thereof, to form an overlapping portion extended from an end of the cylindrical portion to form an outer surface parallel with an opening end surface of the opening portion, and compressing at least a portion of the overlapping portion to be compressed, to produce a compressed portion.
- In the method as described above, the compressed portion may be formed outward of the opening portion in a radial direction of the cylindrical portion. Or, it may be formed inward of the opening portion in a radial direction of the cylindrical portion.
- In the method as described above, the plastic layers may include at least an outer layer, an inner layer and an intermediate layer, and the outermost end of the intermediate layer may be positioned at the compressed portion.
- In the method as described above, an annular member having a step portion formed inward of the annular member in a radial direction thereof to contact with at least the compressed portion may be disposed around the opening portion.
- The above stated object and following description will become readily apparent with reference to the accompanying drawings, wherein like reference numerals denote like elements, and in which:
- FIG. 1 is a cross sectional view of a part of an opening structure of a fuel tank according to an embodiment of the present invention;
- FIG. 2 is an enlarged cross sectional view of a part of the opening structure of the fuel tank according to an embodiment of the present invention;
- FIG. 3 is a plan view of an annular member for use in the opening structure of the fuel tank according to an embodiment of the present invention;
- FIG. 4 is a cross sectional view of an annular member for use in the opening structure of the fuel tank according to an embodiment of the present invention;
- FIG. 5 is a cross sectional view illustrating a bulging step for forming the opening structure of the fuel tank according to an embodiment of the present invention;
- FIG. 6 is a cross sectional view illustrating a compressing step for forming the opening structure of the fuel tank according to an embodiment of the present invention;
- FIG. 7 is an enlarged cross sectional view of a part of an opening structure of a fuel tank according to another embodiment of the present invention;
- FIG. 8 is an enlarged cross sectional view of a part of an opening structure of a fuel tank according to a further embodiment of the present invention;
- FIG. 9 is an enlarged cross sectional view of a part of an opening structure of a fuel tank according to a yet further embodiment of the present invention; and
- FIG. 10 is a cross sectional view of an opening structure of a fuel tank according to a yet further embodiment of the present invention;
- FIG. 11 is an enlarged cross sectional view of a part of the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 12 is an enlarged cross sectional view of another example of a part of the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 13 is a plan view of the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 14 is an enlarged cross sectional view of a part of a die for forming the opening structure according to the embodiment as shown in FIG. 10;
- FIG. 15 is a cross sectional view illustrating a bulging step for forming the opening structure according to the embodiment as shown in FIG. 10; and
- FIG. 16 is a cross sectional view illustrating a compressing step for forming the opening structure according to the embodiment as shown in FIG. 10.
- Referring to FIG. 1, there is illustrated an opening structure of a fuel tank according to an embodiment of the present invention, a part of which is sectioned and enlarged in FIG. 2. According to the present embodiment, a
fuel tank wall 1 is formed with a plastic member having a plurality of layers through blow molding, and anopening portion 1 h is formed integrally with thefuel tank wall 1. A method for producing it will be explained later. - As shown in FIGS. 1 and 2, in the vicinity of the
opening portion 1 h, there are formed acylindrical portion 1 e which is extended from theopening portion 1 h outward of thefuel tank wall 1, and an overlappingportion 1 d which is extended from an end of thecylindrical portion 1 e to enlarge the diameter of theopening portion 1 h and bent at abent portion 1 b to form an outer surface parallel with an opening end surface Sh of theopening portion 1 h. And, at least a portion of the overlappingportion 1 d is compressed in a direction perpendicular to the opening end surface Sh of theopening portion 1 h, to form a compressedportion 1 c. In FIG. 1, hatching to the plastic member constituting thefuel tank wall 1 is omitted to show the structure clearly. - As illustrated in FIG. 2, the plastic member constituting the
fuel tank wall 1 is the one with multiple layers, that includes an outer layer Po and an inner layer Pi, both of which are formed by the strength holding member, and an intermediate layer B which is formed with the barrier material and disposed between them, to be bound together by adhesive plastics. As for the strength holding member employed in the present embodiment, ultra high polymeric (high density) polyethylene is used. As for the barrier material, EVOH (i.e., plastic with ethylene and vinyl-alcohol co-polymerized) is used, for example. According to the present invention, however, the materials are not limited to those as described above, but may be employed any materials which can protect the fuel of gasoline or the like from being passed, to provide effective gas-barrier property. - According to the present embodiment, the
bent portion 1 b is bent inward (toward the opening) as shown in FIG. 2, so that even if the fuel passed through the inner layer Pi, it could be blocked by the intermediate layer B at thebent portion 1 b, effectively. And, thecompressed portion 1 c is formed to provide an annular groove, where the thickness of the outer layer Po is formed relatively thin, comparing with the thickness at thecylindrical portion 1 e. Thus, the thickness of the outer layer Po is formed to be thin at thecompressed portion 1 c, so that the passage has been made narrow, thereby to provide a resistance when the fuel is introduced from an openingend surface 1 p. On the contrary, according to the opening structure without thecompressed portion 1 c formed therein, the opening end surface (corresponding to “1 p” in FIG. 2) of the plastic member with multiple layers can be directly communicated with the outer space. Therefore, even in the case where a seal member (not shown) was disposed between acover member 4 and anannular fixing member 5, the fuel might pass through the outer layer Po. Theoretically, some fuel might be introduced from the openingend surface 1 p to pass through the thin portion of thecompressed portion 1 c, and reach thebent portion 1 b, according to the present embodiment, but the amount of fuel is so small as to be substantially negligible. - Furthermore, an
annular member 2 is placed to surround theopening portion 1 h, and fixed to the same with its inner side abutting on the outer side surface of thecylindrical portion 1 e, and with its top end surface abutting on the lower surface of the overlappingportion 1 d. Theannular member 2 is made of plastic, with a c-shaped cross section opened to the outside in a radial direction, and formed as shown in FIGS. 3 and 4. That is, arecess 2 r is formed around its outer periphery, and opposite end surfaces in its axial direction are formed to be parallel with each other. As shown in FIG. 4, theannular member 2 is formed with a threadedportion 2 s, on its outer side surface at its upper portion. And, as shown in FIG. 3, theannular member 2 is formed with a plurality ofcommunication holes 2 c opened in the axial direction, around its whole periphery. Theannular member 2 is placed so as to surround theopening portion 1 h, and abut on thecylindrical portion 1 e and the overlappingportion 1 d, so that it is bound with the outer layer Po in a body. In other words, when theannular member 2 is formed, the plastic material is introduced into the communication holes 2 c, so that theannular member 2 is secured to thecylindrical portion 1 e not to rotate relative thereto. The outer layer Po is extended to cover a portion of the outer peripheral end of theannular member 2, to form an engagingportion 1 f. - The
opening portion 1 h as constituted above has the compressedportion 1 c to provide an annular groove, which receives a sealingmember 3 made of rubber or the like as shown in FIG. 1. Therefore, after thecover member 4 is placed on the sealingmember 3, the fixingmember 5 having a threaded portion inside thereof is mounted on thecover member 4, and engaged with the threadedportion 2 s of theannular member 2. Consequently, thecover member 4 is tightly fixed to the upper surface of the overlappingportion 1 d through the sealingmember 3. When the fixingmember 5 is screwed, theannular member 2 is not rotated, because theannular member 2 is secured to thecylindrical portion 1 e not to rotate relative thereto. According to the present embodiment, portions through which the fuel in the tank may be communicated with the outside of the tank, are only the portions where the sealingmember 3 abuts on thecover member 4 and overlappingportion 1 d, and the portion where the outer layer Po out of the multiple layers was formed relatively thin, when thecompressed portion 1 c was formed. As a result, the fuel is effectively prevented from passing through the opening portion of thefuel tank wall 1. Particularly, a good sealing property can be ensured, because a profile irregularity has been improved to provide a smooth surface on the bottom surface of thecompressed portion 1 c. - FIGS. 5 and 6 illustrate an example of a process for producing the fuel tank having the opening structure as described above. At the outset, according to a forming process as shown in FIG. 5, placed between dies D1 and D2 is a multi-layer parison PT made of the plastic member with multiple layers. As shown by two-dot chain lines in FIG. 5, the die D1 is supported to move perpendicularly to the die D2. The dies D1 and D2 are formed insides thereof with a protrusion D1 p and a recess D2 r, respectively. The protrusion D1 p is formed to provide the
compressed portion 1 c as shown in FIG. 2, and the recess D2 r is formed to receive theannular member 2. Furthermore, a spacer SP is disposed to move back and forth perpendicularly to the axis of the die D1 (i.e., the axis of theopening portion 1 h). The spacer SP is adapted to hold theannular member 2 within therecess 2 r of theannular member 2 in a pressing process. And, the spacer SP is adapted to move perpendicularly to the axis of the die D1 in accordance with a movement of the die D1. Also, it is so arranged that the air pressure or hydraulic pressure is supplied into the multi-layer parison PT through a conduit (not shown). - Accordingly, with the air pressure or hydraulic pressure introduced into the multi-layer parison PT, the die D1 is moved relative to the die D2 toward the
annular member 2. Simultaneously, in accordance with the movement of the die D1, the spacer SP is moved in the direction perpendicular to the axis of the die D1, and held in therecess 2 r of theannular member 2. As a result, the multi-layer parison PT is bulged outwardly as shown in FIG. 5, while the portion abutting on theannular member 2 is restricted from being bulged outwardly to form thecylindrical portion 1 e. Furthermore, thebent portion 1 b and the overlappingportion 1 d are formed accurately, as shown in FIG. 6. Also, the overlapping portion id is compressed by the protrusion D1 p of the die D1 to form thecompressed portion 1 c. At the same time, formed is acover portion 1 gas shown in FIG. 6, which will be removed later. - FIG. 7 illustrates the opening structure of the fuel tank according to another embodiment of the present invention, wherein all of the overlapping
portion 1 d is compressed to form the overlappingportion 1 d as a whole into the compressed portion. According to this embodiment, therefore, the profile irregularity of the outer surface (upper surface in FIG. 7) of the overlapping portion id is improved to provide a smooth surface, so that a good sealing property can be obtained. Furthermore, if the profile irregularity of the lower surface of thecover member 4 is proper, a good sealing property can be obtained without any sealing member. - FIG. 8 illustrates the opening structure of the fuel tank according to a further embodiment of the present invention, wherein the
annular member 2 is formed on its upper surface with aprotrusion 2 t, so that when the overlappingportion 1 d is compressed, acompressed portion 1 cu is formed on its lower surface. According to this embodiment, thickness of the outer layer Po is made thinner at the compressed portion 1cu to narrow the passage, whereby the resistance is applied to the fuel when introduced from the openingend surface 1 p. Also, the profile irregularity of the outer surface (upper surface in FIG. 8) of the overlappingportion 1 d above thecompressed portion 1 cu is improved to provide a smooth surface, so that a good sealing property can be obtained. - FIG. 9 illustrates the opening structure of the fuel tank further modified to the embodiment as shown in FIG. 8, wherein the
cover portion 1 g remained after the forming process can be removed easily. When compressed, acompressed portion 1 ci is formed on the overlappingportion 1 d at the inner side of theopening portion 1 h in its radial direction. By applying shearing force onto the thincompressed portion 1 ci, he coverportion 1 g can be removed easily. - Next will be explained about a yet further embodiment of the present invention with reference to FIGS.10-16, wherein the outermost end of the intermediate layer B is positioned at the
compressed portion 1 c. In FIGS. 10-16, the elements which are substantially the same as those shown in FIGS. 1-9 are designated by the same reference numerals as the numerals in FIGS. 1-9. Referring to FIGS. 10-13, the fundamental structure of the present embodiment is substantially the same as that shown in FIGS. 1 and 2, except for the position of the outermost end of the intermediate layer B, and the configurations of fuel tank wall 11 (and elements thereof), annular member 12 (and elements thereof) and annular fixingmember 15, which are equivalent to those described originally, and designated by corresponding reference numerals with ten (10) preceding them. - As shown in FIGS. 10 and 11, the outermost end of the intermediate layer B is positioned at a
compressed portion 11 c. And, a liftedwall portion 11 k is formed to extend from abent portion 11 b in parallel with the side surface of acylindrical portion 11 e. Consequently, an annular groove is formed on the compressedportion 11 c inside of the liftedwall portion 11 k. On the contrary, as shown in FIG. 12, a step which is formed when thewall 11 is compressed, without forming the liftedwall portion 11 k, may serve as thecompressed portion 11 c to open outward. Theannular member 12 is placed to surround theopening portion 11 h made of the plastic member forming thefuel tank wall 11, and fixed to the same. Theannular member 12 is made of plastic, with its inner side abutting on the outer side surface of thecylindrical portion 11 e, and with its upper end surface abutting on the lower surface of the overlappingportion 11 d. And, theannular member 12 is formed at its inside with astep portion 12 d to abut on thebent portion 11 b (and the liftedwall portion 11 k as shown in FIG. 11 in this embodiment). Theannular member 12 is formed at its outside with a threadedportion 12 s, and formed with arecess 12 r on one end surface in its axial direction (i.e., lower end surface as shown in FIG. 11). - With respect to the opening
portion 11 h as constituted above, the compressedportion 11 c provides an annular groove, which receives the sealingmember 3 as shown in FIG. 11. Therefore, after thecover member 4 is placed on the sealingmember 3, the annular fixingmember 15 having a threaded portion inside thereof is mounted on thecover member 4, and engaged with the threadedportion 12 s of theannular member 12. Consequently, thecover member 4 is tightly fixed to the upper surface of the compressedportion 11 c through the sealingmember 3. According to the present embodiment, portions through which the fuel in the tank may be communicated with the outside of the tank, are only the portions where the sealingmember 3 abuts on thecover member 4 andcompressed portion 11 c, and the portion where the outer layer Po out of the multiple layers was formed relatively thin, when the compressedportion 11 c was formed, and particularly, the outermost end of the intermediate layer B is positioned at acompressed portion 11 c, so that a passage is formed narrow. As a result, the fuel is effectively prevented from passing through the opening portion of thefuel tank 11. Additionally, a good sealing property can be ensured, because a profile irregularity has been improved to provide a smooth surface on the bottom surface of the compressedportion 11 c. - FIG. 14 illustrates dies for use in producing the fuel tank having the opening structure as shown in FIGS. 10 and 11, and FIGS. 15 and 16 illustrate an example of the process for producing it. In the following description, structural elements of dies equivalent to those described originally are designated by corresponding reference numerals with (o) following them. As shown in FIG. 14, a die D1 o is supported to move vertically, while a die D2 o is supported to move horizontally. The dies D1 o and D2 o are formed insides thereof with a protrusion D1 po and a recess D2 ro, respectively. The protrusion D1 po is formed to provide the compressed
portion 11 c as shown in FIG. 11, and the recess D2 ro is formed to receive the threadedportion 12 s of theannular member 12. In FIG. 14, the formed or finished openingportion 11 h of thefuel tank wall 11 is shown. - In a forming process as shown in FIG. 15, after the
annular member 12 is placed between the dies D1 o and D2 o, the multi-layer parison PT made of the plastic member with multiple layers (three layers in this embodiment). And, it is so arranged that the air pressure or hydraulic pressure is supplied into the multi-layer parison PT. Accordingly, with the air pressure or hydraulic pressure introduced into the multi-layer parison PT, the die D1 o is moved relative to the die D2 o toward theannular member 12 as indicated by a blank arrow in FIG. 15. As a result, the multi-layer parison PT is bulged outwardly as shown in FIG. 15, while the portion abutting on theannular member 12 is restricted from being bulged outwardly to form thecylindrical portion 11 e. Furthermore, the bent portion llb and the overlappingportion 11 d are formed accurately, as shown in FIG. 16. Also, the overlappingportion 11 d is compressed by the protrusion D1 po of the die D1 o to form the compressedportion 11 c and the liftedwall portion 11 k. At the same time, formed is acover portion 11 g as shown in FIG. 16, which will be removed later. - It should be apparent to one skilled in the art that the above-described embodiments are merely illustrative of but a few of the many possible specific embodiments of the present invention. Numerous and various other arrangements can be readily devised by those skilled in the art without departing from the spirit and scope of the invention as defined in the following claims.
Claims (18)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-237980 | 2000-08-07 | ||
JP2000237980A JP4593742B2 (en) | 2000-08-07 | 2000-08-07 | FUEL TANK OPENING STRUCTURE AND METHOD FOR PRODUCING FUEL TANK HAVING THE OPENING STRUCTURE |
JP2001153250A JP4593826B2 (en) | 2001-05-22 | 2001-05-22 | FUEL TANK OPENING STRUCTURE AND METHOD FOR PRODUCING FUEL TANK HAVING THE OPENING STRUCTURE |
JP2001-153250 | 2001-05-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020017527A1 true US20020017527A1 (en) | 2002-02-14 |
Family
ID=26597454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/921,599 Abandoned US20020017527A1 (en) | 2000-08-07 | 2001-08-06 | Opening structure of a fuel tank |
Country Status (2)
Country | Link |
---|---|
US (1) | US20020017527A1 (en) |
EP (1) | EP1179444A3 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6698613B2 (en) | 2001-08-09 | 2004-03-02 | Fts Co., Ltd. | Opening structure of a fuel tank |
US20070062841A1 (en) * | 2002-12-06 | 2007-03-22 | Kazuhiro Nakamura | Cover body mounting structure of resin container |
US20070181582A1 (en) * | 2004-03-04 | 2007-08-09 | Inergy Automotive Systems | System for fastening two components, method of fastening by means of this fastening system, and fuel system |
CN100352740C (en) * | 2002-12-06 | 2007-12-05 | 八千代工业株式会社 | Cover body mounting structure of resin container |
US20080252020A1 (en) * | 2007-04-12 | 2008-10-16 | Ti Group Automotive Systems, L.L.C. | Ring seal with axially-opposed radially-offset seal beads |
US20090058015A1 (en) * | 2007-08-29 | 2009-03-05 | Ti Group Automotive Systems, L.L.C. | Ring seal having sealing lobes |
US20090127805A1 (en) * | 2007-11-20 | 2009-05-21 | Eaton Corporation | Assembly for Sealing a Component and Method |
US20090256317A1 (en) * | 2008-04-14 | 2009-10-15 | Ti Group Automotive Systems, L.L.C. | Cover for fuel system component and method of making |
US20100109260A1 (en) * | 2008-10-31 | 2010-05-06 | Ti Group Automotive Systems, L.L.C. | Ring seal with insert |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6860398B2 (en) * | 2000-11-30 | 2005-03-01 | Visteon Global Technologies, Inc. | Low permeation fittings, low permeation containers utilizing same, and methods for forming same |
FR2869842B1 (en) * | 2004-05-07 | 2007-07-06 | Inergy Automotive Systems Res | DEVICE FOR FASTENING A COMPONENT TO A HOLLOW BODY, FASTENING METHOD THEREOF, FUEL TANK |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6183509U (en) | 1984-11-07 | 1986-06-02 | ||
JPH047925U (en) | 1990-05-10 | 1992-01-24 | ||
JP2906701B2 (en) | 1991-03-15 | 1999-06-21 | 日産自動車株式会社 | Fuel unit mounting structure to resin fuel tank |
US5330068A (en) * | 1993-07-06 | 1994-07-19 | Ford Motor Company | Fuel tank closure assembly |
DE19627395A1 (en) * | 1996-07-06 | 1998-01-15 | Kautex Werke Gmbh | Fuel tank |
JP3417282B2 (en) * | 1998-01-13 | 2003-06-16 | トヨタ自動車株式会社 | Hollow resin container |
-
2001
- 2001-08-06 US US09/921,599 patent/US20020017527A1/en not_active Abandoned
- 2001-08-06 EP EP01118977A patent/EP1179444A3/en not_active Withdrawn
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6698613B2 (en) | 2001-08-09 | 2004-03-02 | Fts Co., Ltd. | Opening structure of a fuel tank |
US20070062841A1 (en) * | 2002-12-06 | 2007-03-22 | Kazuhiro Nakamura | Cover body mounting structure of resin container |
CN100352740C (en) * | 2002-12-06 | 2007-12-05 | 八千代工业株式会社 | Cover body mounting structure of resin container |
US20070181582A1 (en) * | 2004-03-04 | 2007-08-09 | Inergy Automotive Systems | System for fastening two components, method of fastening by means of this fastening system, and fuel system |
US7854434B2 (en) | 2007-04-12 | 2010-12-21 | Ti Group Automotive Systems, L.L.C. | Ring seal with axially-opposed radially-offset seal beads |
US20080252020A1 (en) * | 2007-04-12 | 2008-10-16 | Ti Group Automotive Systems, L.L.C. | Ring seal with axially-opposed radially-offset seal beads |
US20090058015A1 (en) * | 2007-08-29 | 2009-03-05 | Ti Group Automotive Systems, L.L.C. | Ring seal having sealing lobes |
US7975870B2 (en) | 2007-08-29 | 2011-07-12 | Ti Group Automotive Systems, L.L.C. | Ring seal having sealing lobes |
US20090127805A1 (en) * | 2007-11-20 | 2009-05-21 | Eaton Corporation | Assembly for Sealing a Component and Method |
US20090256317A1 (en) * | 2008-04-14 | 2009-10-15 | Ti Group Automotive Systems, L.L.C. | Cover for fuel system component and method of making |
US8910815B2 (en) * | 2008-04-14 | 2014-12-16 | Ti Group Automotive Systems, L.L.C. | Cover for fuel system component and method of making |
US20100109260A1 (en) * | 2008-10-31 | 2010-05-06 | Ti Group Automotive Systems, L.L.C. | Ring seal with insert |
US8419021B2 (en) | 2008-10-31 | 2013-04-16 | Ti Group Automotive Systems, L.L.C. | Ring seal with insert |
Also Published As
Publication number | Publication date |
---|---|
EP1179444A3 (en) | 2005-07-27 |
EP1179444A2 (en) | 2002-02-13 |
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