JP2006009850A - Shutter valve mounting structure for resin tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter valve mounting structure for a resin tank fitted to a resin tank by welding to reduce the permeation of a fuel, dispensing with insert molding, and enabling a shutter valve for metal tank to be diverted. <P>SOLUTION: This shutter valve mounting structure for the resin tank comprises a cylindrical mounting part 20 formed of a resin material weldable to the resin tank 40, forming a connection pipe part welded from the outside of the resin tank 40 and connected to an external pipe, and having a peripheral step part 25 formed on the external pipe side end part inner periphery thereof, an inner tube 30 formed of a reinforced resin material or a metal material having a fuel permeability resistance higher than that of the cylindrical mounting part 20, having, at one end, a flange part 32 engaged with the step part 25, inserted into the cylindrical mounting part 20, and fixed by caulking the cylindrical mounting part 20 in the engaged state of the flange part 32 with the step part 25, and a shutter valve 10 mounted at the end part of the inner tube 30 installed in a fuel tank. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin tank shutter valve mounting structure that is attached to a resin tank of an automobile or the like, reduces fuel permeation, does not require insert molding, and can be used as a metal tank shutter valve.

  A fuel tank of an automobile or the like is formed of a metal material such as Fe or a resin material. Various components are attached to the fuel tank, and a fuel supply pipe is attached as a member for supplying fuel into the fuel tank. The fuel is filled in the fuel tank from a fuel supply port provided on the side wall of the vehicle body through a fuel supply pipe connected to the fuel supply port and a fuel supply pipe connected to the fuel supply pipe. In the case of a metal tank, the fuel supply pipe is made of a metal material and is attached to the fuel tank by a joining method such as welding. In addition, a shutter valve (hereinafter referred to as a shutter valve) for preventing fuel backflow is attached to the outlet of the fuel supply pipe in order to prevent blowback due to fuel backflow.

  As a shutter valve for such a metal tank, in Patent Document 1 below, an annular step portion is formed on the inner surface of one opening portion, and the opening portion is on the outer side to prevent a back flow. A cylindrical case to be attached, and a valve body which is swingably attached to the opening of the case and whose outer periphery fits into the stepped portion when swinging to an inner closing position, thereby closing the case. And an inner peripheral surface of the edge of the opening in the case is in sliding contact with the outer peripheral surface of the valve body that swings inward, and this is in the closed position. A backflow prevention valve (shutter valve) is disclosed which has a conical inclined surface with a diameter decreasing toward the inside of the case.

  On the other hand, the resin tank is generally made of a resin having a multilayer structure whose outer side is made of polyethylene, and an attachment hole is formed on the upper wall thereof. It is attached by welding.

As this attachment part, the following Patent Document 2 has a welding end that is thermally welded to the wall surface of the fuel tank, a connection passage that connects the inside and outside of the fuel tank, and a tube body that connects the hose. A weld joint for a fuel tank comprising a joint body and a barrier layer formed on the surface of the joint body, wherein the joint body is formed of a first resin material having weldability on the wall surface of the fuel tank, The barrier layer is formed of a second resin material that has adhesive reactivity with the first resin material and has better fuel permeation resistance than the first resin material, and is formed so as to extend beyond the tip of the tube body. There is disclosed a weld joint for a fuel tank characterized by having a terminal portion.
Japanese Utility Model Publication No. 5-90062 JP 2002-254938 A

  The weld joint for a fuel tank disclosed in Patent Document 2 includes a joint body made of a first resin material having weldability on the wall surface of the fuel tank, and a barrier made of a second resin material having better fuel permeation resistance than the first resin material. The layers are manufactured by insert molding. However, such insert molding has many steps for supplying insert parts (in the case of Patent Document 2, a barrier layer), and a dedicated molding machine may be required, so that the manufacturing cost tends to be high. There was a problem.

  Further, the backflow prevention valve (shutter valve) of Patent Document 1 is not clearly shown, but is assumed to be attached to a metal tank, and is attached to the end of a metal fuel supply pipe attached to the metal tank. It has been. Since this fuel supply pipe is made of metal, it cannot be attached to the resin tank as it is, and as a result, the shutter valve of Patent Document 1 cannot be attached to the resin tank.

  Accordingly, an object of the present invention is to attach to a resin tank of an automobile or the like by welding, reduce fuel permeation, eliminate the need for insert molding, and divert a metal tank shutter valve as a resin tank shutter valve. Another object of the present invention is to provide a shutter valve mounting structure for a resin tank.

  In order to achieve the above object, a first aspect of the present invention is a connection pipe portion made of a resin material that can be welded to a resin tank, welded from the outside to the periphery of the mounting hole of the resin tank, and connected to external piping. Is it formed from a cylindrical mounting part in which a circumferential step is formed on the inner periphery of the end of the external pipe side, and a reinforced resin material having better fuel permeation resistance than the resin material of the cylindrical mounting part? Alternatively, the cylindrical attachment is made of a metal material, has a flange portion that engages with the stepped portion at one end, is inserted into the cylindrical mounting portion, and the flange portion is engaged with the stepped portion. A shutter valve mounting structure for a resin tank, comprising: an inner cylinder fixed by caulking a portion; and a shutter valve attached to an end portion disposed in the fuel tank of the inner cylinder. It is to provide.

  According to the first aspect, when the inner cylinder is inserted into the inner periphery of the cylindrical mounting portion, the flange portion at the end of the inner cylinder engages with the circumferential step portion at the inner periphery of the end of the cylindrical mounting portion. In this state, when the end of the cylindrical attachment portion is crimped, the inner cylinder is attached to the cylindrical attachment portion. In this way, just by inserting the inner cylinder into the inner periphery of the cylindrical mounting part and caulking the end of the cylindrical mounting part, the inner cylinder can be firmly and easily removed from the cylindrical mounting part. Can be installed.

  And since the said cylindrical attachment part is formed with the material which can be welded to a resin tank, it can be attached to the periphery of the attachment hole of a resin tank by welding. In this way, the inner cylinder and the cylindrical mounting part are formed separately, and the inner cylinder is attached to the cylindrical mounting part in a later process, so there is no need to insert-mold the inner cylinder and simplify the manufacturing process. Therefore, there is no need for a dedicated molding machine or the like, and the manufacturing cost can be reduced.

  Furthermore, since the inner cylinder is formed of a reinforced resin material having excellent fuel permeation resistance or a metal material that does not allow fuel vapor to permeate, the permeation of fuel vapor can be effectively reduced. Further, the inner cylinder is made of the above-described material and has high rigidity. For this reason, even if the outer periphery of the end of the cylindrical mounting portion arranged outside the resin tank is covered with the end of a fuel supply pipe or the like and the outer periphery is tightened with a hose band or the like, it is reinforced with a highly rigid inner cylinder. Therefore, the cylindrical mounting portion and the inner cylinder are not damaged by the tightening force of the hose band or the like, and the fuel supply pipe and the like can be firmly attached to the cylindrical mounting portion.

  Since the metal tank shutter valve as shown in Patent Document 1 can be attached to the end portion of the inner cylinder disposed in the fuel tank, the metal tank shutter valve is used for the resin tank. It can be used as a shutter valve, making it possible to share parts and reduce manufacturing costs.

  According to a second aspect of the present invention, in the first aspect, an annular rib is formed on at least one of an inner circumference of the cylindrical mounting portion or an outer circumference of the inner cylinder. There is provided a shutter valve mounting structure for a resin tank that is disposed inside a tightening fixing means for tightening an external pipe connected to a cylindrical mounting portion.

  According to the second aspect of the present invention, the annular rib formed on at least one of the inner periphery of the cylindrical mounting portion or the outer periphery of the inner tube has a pressing force by an external pipe connected to the cylindrical mounting portion, The external pressure of both the fastening force by the fastening fixing means that tightens the external piping comes into pressure contact with the inner circumference of the cylindrical mounting portion or the outer circumference of the inner cylinder, so that the sealing performance between the cylindrical mounting portion and the inner cylinder is improved, The fuel vapor permeability can be further reduced.

  According to the shutter valve mounting structure for a resin tank of the present invention, the inner cylinder is removed from the cylindrical mounting portion by simply inserting the inner cylinder into the inner periphery of the cylindrical mounting portion and caulking the end of the cylindrical mounting portion. It can be securely and easily attached without coming off, and it is not necessary to insert-mold the inner cylinder, so that the manufacturing cost can be reduced. In addition, since the inner cylinder is made of a reinforced resin material or metal material with excellent fuel permeation resistance, it effectively reduces the permeation of fuel vapor and has high rigidity. Even if the outer periphery of the cylindrical attachment portion is tightened, external piping can be attached without damaging the cylindrical attachment portion or the inner cylinder. Furthermore, since the conventional metal tank shutter valve can be attached to the end of the inner cylinder disposed in the fuel tank by simply inserting it, the parts can be made common and the manufacturing cost can be reduced.

  Hereinafter, with reference to FIGS. 1-5, one Embodiment of the shutter valve attachment structure for resin tanks of this invention is described.

  In FIG. 1, 10 is a shutter valve. Referring also to FIG. 2, the shutter valve 10 includes a cylindrical valve body 11, a valve body 12 fitted to the outlet 11 a of the valve body 11, and a biasing direction in which the valve body 12 is always closed. And a spring 13 that performs the same.

  A hinge portion 11b made of a cylindrical member having a C-shaped cross section is formed on the periphery of the outlet 11a of the valve body 11. On both sides of the hinge portion 11b, spring locking portions 11c and 11c are projected. Further, the insertion port on the side opposite to the outlet 11a has a tapered peripheral edge so that an inner cylinder 30 described later can be easily inserted.

  Further, a substantially C-shaped notch 11d is formed on the opposite side of the hinge portion 11b at the approximate center of the peripheral wall of the valve body 11. An engaging projection 11e is provided on the inner side of the notch 11d and on the inner periphery of the valve body 11. The engaging protrusion 11e has a slope that gradually decreases toward the insertion port, and is not caught by the inner cylinder 30 when the inner cylinder 30 is inserted.

  When the inner cylinder is inserted into the shutter valve 10, the engagement protrusion 11 e is pressed against the outer periphery of the inner cylinder 30 and naturally bends radially outward. When the engagement protrusion 11 e is positioned in the engagement hole 34 of the inner cylinder 30, the original shape is obtained. Then, the shutter valve 10 is fixed to the inner cylinder 30. Further, the engaging protrusion 11 e is also positioned when the shutter valve 10 is attached to the inner cylinder 30.

  The valve body 12 has a substantially disk shape, and a support shaft 12a is formed on the periphery thereof. Then, the valve body 12 is rotatably mounted on the hinge portion 11b by fitting the support shaft 12a into the recess of the hinge portion 11b.

  Such valve body 11 and valve body 12 are formed of a resin such as polyacetal or polyamide.

  The spring 13 is formed by connecting two coil portions 13a and 13a, and further has L-shaped portions 13b and 13b extending from end portions of the coil portions 13a and 31a.

  Then, the two coil portions 13a and 13a are fitted on both sides of the support shaft 12a, and the L-shaped portions 13b and 13b are locked to the spring locking portions 11b and 11b, so that the valve body 12 is elastically attached in the closing direction. It has come to force.

  The shutter valve 10 described above is attached to a fuel supply pipe joined to a metal tank, and has the same structure as that generally used as a metal tank shutter valve.

  FIG. 3 shows a cylindrical mounting portion 20, which is connected to a flange portion 21 welded to the periphery of the mounting hole of the resin tank and an external pipe such as a fuel supply pipe. Connecting pipe portion 22. An annular convex portion 23 is formed on the outer periphery of the distal end portion of the connecting pipe portion 22 and serves as a retainer when an external pipe is attached. As will be described later, tightening fixing means such as a hose band is attached to the outer periphery of the external pipe connected to the connecting pipe portion 22, and the external pipe is tightened by the tightening fixing means. It will be.

  In addition, a diameter-expanded portion 24 having a slightly larger diameter is formed on the inner periphery of the distal end portion of the connecting pipe portion 22, and a step portion 25 is formed in the back thereof. The flange portion 32 of the inner cylinder 30 is engaged with the step portion 25.

  As a material of this cylindrical attachment part 20, it is formed with the material which can be welded to a resin tank, for example, olefin resin, such as polyethylene.

  FIG. 4 shows an inner cylinder 30 that is inserted into the inner periphery of the cylindrical mounting portion 20. As the material of the inner cylinder 30, a fuel-permeable resin material that does not easily transmit fuel vapor, such as polyacetal or polyamide, is used, and glass fiber, calcium silicate, or the like is contained as a reinforcing material. ing. Or you may form with metal materials, such as a Fe-type alloy.

  Thus, since the inner cylinder 30 is formed of a reinforced resin material having excellent fuel permeation resistance or a metal material that does not allow fuel vapor to permeate, the inner cylinder 30 is attached when attached to the attachment hole of the resin tank. The permeation of fuel vapor from the part can be effectively prevented. Moreover, since the inner cylinder 30 is formed of the above-mentioned material, the rigidity is high. Therefore, even when the outer periphery of the end of the cylindrical mounting portion 20 disposed outside the resin tank is covered with the end of a fuel supply pipe or the like and the outer periphery is tightened with a hose band or the like, the highly rigid inner cylinder 30 Since it is reinforced, the cylindrical mounting portion 20 and the inner cylinder 30 are not damaged by the tightening force of the hose band or the like, and the fuel supply pipe or the like can be firmly attached to the cylindrical mounting portion 20.

  The above-described inner cylinder 30 has a cylindrical inner cylinder main body 31, and a flange portion 32 protruding in the radial direction is formed on the periphery of the base end portion of the inner cylinder main body 31. The flange portion 32 is formed to have a diameter slightly smaller than the inner diameter of the enlarged diameter portion 24 of the cylindrical mounting portion 20 and larger than the inner diameter of the step portion 25.

  Further, when the inner cylinder 30 is formed of the resin material described above, an annular rib 33 is formed on the outer periphery of the inner cylinder 30 in the middle of the axial direction (see FIG. 4, partially enlarged view). . In the case of this embodiment, two annular ribs 33 are formed on the outer periphery of the inner cylinder 30 with a predetermined interval.

  On the other hand, when the inner cylinder 30 is made of a metal material, it is difficult to form the annular rib 33 on the inner cylinder body 31 because of the manufacturing method. It is preferable to form a rib. In addition, when the inner cylinder 30 is a resin material, you may form an annular rib in the inner periphery of the cylindrical attachment part 20. FIG.

  In this way, the annular rib 33 is formed on at least one of the inner periphery of the cylindrical mounting portion 20 or the outer periphery of the inner tube 30, so that the annular tube 33 is inserted into the cylindrical mounting portion 20. The ribs seal the inner circumference of the cylindrical mounting portion 20 and the gap between the outer circumference of the inner cylinder 30 and reduce the fuel vapor permeability.

  Further, the annular rib 33 is formed so as to be inside the tightening fixing means for tightening the external pipe connected to the cylindrical mounting portion 20 when the inner cylinder 30 is mounted to the cylindrical mounting portion 20. Is preferred. By forming in this way, the annular rib 33 is formed by the external pressure of both the pressing force by the external piping connected to the outer periphery of the cylindrical mounting portion 20 and the tightening force by the tightening fixing means for tightening the external piping. Since it comes in pressure contact with the inner periphery of the cylindrical attachment portion 22 or the outer periphery of the inner cylinder 30, the sealing property between the cylindrical attachment portion 20 and the inner cylinder 30 can be improved, and the fuel vapor permeability can be further reduced.

  When the inner cylinder 30 is formed of a resin material, an annular recess may be provided on the outer periphery of the inner cylinder 30, and an O-ring or the like may be attached to the recess to ensure sealing performance.

  In addition, an engagement hole 34 is formed at a predetermined position near the tip of the inner cylinder main body 31 and is large enough to engage with an engagement protrusion 11 e provided on the shutter valve 10. Therefore, when the end portion of the inner cylinder 30 is inserted into the inner periphery of the shutter valve 10, the engagement protrusion 11 e is pressed against the outer periphery of the inner cylinder 30 and naturally bends radially outward to be positioned in the engagement hole 34 of the inner cylinder 30. Then, since the original shape is elastically restored and engaged with the engagement hole 34, the shutter valve 10 can be attached to the inner cylinder 20 with one touch.

  Each of the above members will be assembled as follows.

  First, the inner cylinder 30 is inserted into the inner periphery of the cylindrical mounting portion 20 from above. Then, the flange part 32 of the inner cylinder 30 engages with the step part 25 of the cylindrical attachment part 20, and the inner cylinder 30 is positioned. In this state, the end of the cylindrical mounting portion 20, that is, the tip of the connecting tube portion 22, is melted by, for example, hot plate welding, high frequency welding, ultrasonic welding, and further crimped, thereby The inner cylinder 30 can be attached to the shape attachment portion 20. Thus, the inner cylinder 30 is inserted into the inner periphery of the cylindrical mounting portion 20 and the end of the cylindrical mounting portion 20 is simply caulked, and the inner cylinder 30 is securely removed without being detached from the cylindrical mounting portion 20. And can be easily installed.

  Moreover, since the inner cylinder 30 and the cylindrical attachment part 20 were separately molded and the inner cylinder 30 was attached to the cylindrical attachment part 20 in a later process, there is no need to insert-mold the inner cylinder 30 and the manufacturing process The manufacturing cost can be reduced because there is no need for a dedicated molding machine or the like.

  When the inner cylinder 30 is attached to the cylindrical attachment portion 20, the distal end portion of the inner cylinder 30 is inserted into the insertion port of the shutter valve 10. Then, the engagement protrusion 11 e of the shutter valve 10 is engaged with the engagement hole 34, and the shutter valve 10 can be attached to the inner cylinder 30. In this way, the shutter valve 10 can be easily attached to the inner cylinder 30 with a single touch, and the engagement protrusion 11e and the engagement hole 34 can be positioned when attaching to the inner cylinder 30. Installed accurately. Moreover, since the shutter valve used conventionally can be diverted and can be mounted as it is as the shutter valve 10 for the resin tank, it is possible to reduce the manufacturing cost by using common parts.

  When the shutter valve 10 is attached to the inner cylinder 30, the inner cylinder 30 is inserted into the attachment hole 41 of the resin tank 40 from the shutter valve 10 side as shown in FIG. Next, the shutter valve 10 is hermetically attached to the resin tank 40 by welding the flange portion 21 of the cylindrical attachment portion 20 to the peripheral edge portion of the attachment hole 41.

  For example, a fuel supply pipe 42 is inserted from the outside into the outer periphery of the connecting pipe portion 22 of the cylindrical mounting portion 20 arranged outside the resin tank 40, and a hose band 43 is attached to the outer periphery of the fuel supply pipe 42. Thus, the fuel supply pipe 42 can be connected by tightening to the outer periphery of the connection pipe portion 22.

  At this time, since the inner cylinder 30 is formed of a reinforced resin material or metal material having high rigidity, the cylindrical mounting portion 20 and the inner cylinder 30 are not damaged by the tightening force of the hose band 43, and fuel is supplied. The tube 42 can be firmly attached to the cylindrical attachment portion 20.

  In addition, the inner cylinder 30 is formed of a reinforced resin material having excellent fuel permeation resistance or a metal material that does not allow fuel vapor to permeate. In addition, the inner cylinder 30 or the inner cylinder 30 is formed. Since the annular rib 33 is formed on at least one of the outer circumferences of the cylinders, the gap between the inner circumference of the cylindrical mounting portion 20 and the outer circumference of the inner cylinder 30 is sealed, thereby effectively preventing the permeation of fuel vapor. can do.

  Further, in the case of this embodiment, the annular rib 33 is formed so as to be inside the fastening fixing means such as the hose band 43 for fastening the fuel supply pipe 42 which is an external pipe connected to the cylindrical mounting portion 20. (See FIG. 5). Therefore, the annular rib 33 is formed by the cylindrical mounting portion 20 by the external pressure of both the pressing force by the fuel supply pipe 42 connected to the outer periphery of the cylindrical mounting portion 20 and the tightening force by the hose band 43 that tightens the fuel supply pipe 42. Since it comes into pressure contact with the inner periphery of 22 or the outer periphery of the inner cylinder 30, the sealing property between the cylindrical mounting portion 20 and the inner cylinder 30 can be improved, and the permeability of the fuel vapor can be further reduced.

  When fuel is supplied from a fuel supply port (not shown), and fuel is supplied into a fuel supply pipe 42 connected to the fuel supply port, the fuel passes through the inner cylinder 30 and the valve body of the shutter valve 10 by the pressure. 12 is opened against the urging force of the spring 13 and supplied into the resin tank 40. Further, when the supply of fuel is stopped, the valve body 12 is closed by the urging force of the spring 13, and the fuel in the resin tank 40 is prevented from being blown back due to backflow.

  The present invention is attached to a resin tank of an automobile or the like by welding, reduces fuel permeation, does not require insert molding, and can be used as a shutter valve for a resin tank. It can be used as a shutter valve mounting structure for a resin tank.

It is a disassembled perspective view which shows one Embodiment of the attachment structure of the shutter valve for resin tanks of this invention. The shutter valve for resin tanks used for the attachment structure of the shutter valve for resin tanks is shown, (a) is sectional drawing along CC line, (b) is a perspective view. It is sectional drawing which followed the AA arrow line in FIG. 1 of the cylindrical attachment part used for the attachment structure of the shutter valve for resin tanks. It is sectional drawing along the BB arrow line in FIG. 1 of an inner cylinder used for the attachment structure of the shutter valve for resin tanks. It is sectional drawing which shows the state which attached the shutter valve for resin tanks to the resin tank by the attachment structure of the shutter valve for resin tanks.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shutter valve 20 Cylindrical attachment part 22 Connection pipe part 25 Step part 30 Inner cylinder 32 Flange part 33 Annular rib 40 Resin tank 41 Attachment hole 42 Fuel supply pipe (external piping)
43 Hose band (tightening means)

Claims (2)

It is made of a resin material that can be welded to the resin tank, and is welded from the outside to the periphery of the mounting hole of the resin tank to form a connecting pipe portion to which an external pipe is connected. A cylindrical mounting portion formed with a portion;
The cylindrical mounting portion is formed of a reinforced resin material that is more excellent in fuel permeation resistance than the resin material, or is formed of a metal material, and has a flange portion that engages with the stepped portion at one end. An inner cylinder that is inserted into a cylindrical mounting portion and fixed by caulking the cylindrical mounting portion with the flange portion engaged with the stepped portion,
A shutter valve mounting structure for a resin tank, comprising: a shutter valve mounted on an end portion disposed in the fuel tank of the inner cylinder. An annular rib is formed on at least one of the inner periphery of the cylindrical mounting portion or the outer periphery of the inner cylinder, and the annular rib is tightened to tighten external piping connected to the cylindrical mounting portion. 2. The shutter valve mounting structure for a resin tank according to claim 1, which is disposed inside the fixing means.

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