CN1763408A - Welding joint of fuel tank - Google Patents
Welding joint of fuel tank Download PDFInfo
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- CN1763408A CN1763408A CN 200510109535 CN200510109535A CN1763408A CN 1763408 A CN1763408 A CN 1763408A CN 200510109535 CN200510109535 CN 200510109535 CN 200510109535 A CN200510109535 A CN 200510109535A CN 1763408 A CN1763408 A CN 1763408A
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Abstract
A welding joint has a cylindrical portion being a connection portion and an annular fusion-welded portion disposed at a base end part of the cylindrical portion, the fusion-welded portion being configured to be thermal fusion welded to a resin-made fuel tank. At least parts of the fusion-welded portion and the cylindrical portion are integrally molded by employing a resinous alloy material in which a modified high-density polyethylene obtained by introducing a functional group of high affinity to a hydroxyl group of ethylene-vinylalcohol copolymer is alloyed with the ethylene-vinylalcohol copolymer singly or together with high-density polyethylene.
Description
Technical field
The present invention relates to a kind of being used for is connected to the resin system joint of resin fuel tank with pipe arrangement with pipe or connector, more specifically, relate to a kind of by melting welding to the resin system fusion splice of fuel tank with the formation joint.
Background technique
Be installed in fuel tank on the automobile is provided with the joint that is used to connect pipe integratedly, the fuel that is used for injecting from inlet imports fuel tank connector etc.
Here, under the situation of the pipe that for example fuel is imported fuel tank from inlet, adopted rubber tubulation (rubber hose) so far.Yet, consider environmental protection in recent years, fuel is strictly controlled to outside infiltration by this flexible pipe.Therefore, adopted the rubber/plastics composite pipe as pipe arrangement with pipe, wherein rubber hose further comprise the resin blocking layer, the rubber tube of making by fluorine rubber or the pitch tube that only is formed from a resin with anti-fuel permeability.
So far, adopted for example conduct of the linkage structure shown in Figure 12 A and Figure 12 B to be used for the linkage structure of this pipe of fuel tank.
With reference to figure 12A, reference character 200 expression resin fuel tanks, reference character 202 representation classes are similar to resinous fusion splice.Fusion splice 202 is integrated into fuel tank 200 by thermofussion welding.
The fuel that reference character 208 expressions are used for injecting from inlet imports the pitch tube of fuel tank 200.Shown in Figure 12 B, pitch tube 208 is provided with bellows portion 210 to provide flexible.
With reference to figure 12B and Figure 13, reference character 212 expression quick connectors, pitch tube 208 is connected to fusion splice 202 by it.
Threaded coupling portion 218 is assembled to fix the portion of this pitch tube by pressure for mated condition beyond the pitch tube 208 thereon.This threaded coupling portion 218 is formed on the outer surface of (coming-off) portion that has Drop-proof, and this anti-shedding part has axially that a plurality of circular protrusions 232 and its cross section separated by a distance is flexuose.In addition, the interior all sides in threaded coupling portion 218 keep a plurality of O-rings (seal ring).
On the other hand, socket shape stopper holding part 230 is provided with groove 236 that is circular arc and the part annulus 238 that is corresponding circular arc.
By this linkage structure, the end of pitch tube 208 is forced in the threaded coupling portion 218 that ground pressure is assembled to connector body 214, thereby is fixed.
In the case, the end of pitch tube 208 because pressure is assembled in the threaded coupling portion 218, therefore is out of shape with its diameter is extended, shown in Figure 12 B, thereby makes the radially tensioning of threaded coupling portion 218 at connector body 214 by strong tension force.
Because this tension force and the interlocking that is arranged on the circular protrusion 232 of threaded coupling portion 218, the end of pitch tube 208 is fixed to connector body 214.
Under this occasion, the stopper 216 that keeps by connector body 214 by flange part 206 with its diameter extended and resiliently deformable.When flange part 206 had arrived engagement grooves 244, stopper 216 is resiliently deformable once more with its reduced, and flange part 206 and engagement grooves 244 become jointing state thus.
Simultaneously, cylindrical portion 204 is arranged in part with respect to the distal side of flange part 206 and becomes O-ring 234 on all sides that are coupled to connector body 214, sets up thus to seal between cylindrical portion 204 and connector body portion 214.
Simultaneously, different with above-mentioned linkage structure, imagine direct cooperation and connected pitch tube 208 on the cylindrical portion 204 of fusion splice 202, and need not to insert quick connector.
In any case by melting welding and with resin system fusion splice and resin fuel tank is integrated when constituting, problem as described below is intrinsic at the joint of pipe.
So far, HDPE (high density polyethylene (HDPE)) resin has been used as the cladding material of fuel tank.Therefore, require and fusible this fuel tank that is welded to of the incorporate fusion splice of fuel tank.
In view of the above, for melting welding, comprise that the whole fusion splice of cylindrical portion constitutes by the HDPE resin that adopts same material.Yet although the HDPE resin has the good melting welding performance with fuel tank, it also demonstrates anti-fuel permeability deficiency, thereby the problem that fuel oozes out from fusion splice takes place.
As another problem, HDPE anti-sagging nature deficiency, therefore when this HDPE bore from pipe arrangement with pipe as the strong tension force of pitch tube, it trended towards plastic deformation and permanent strain, and the Drop-proof power of worry pipe or sealability in time passing and reduce.
Be connected at quick connector under the situation that is connected of the HDPE system fusion splice that is formed with flange part and flange part and stopper (joining portion) joint of quick connector, the hypodynamic problem of Drop-proof also occurs.
For solving the problem of anti-fuel permeability, JP-A-2002-254938 discloses a kind of fusion splice, but its by along its radially stacked have with the first portion of the heat sealability of fuel tank with by the second portion that the resin material with anti-fuel permeability (barrier properties) is made constitute.
Figure 14 shows the example of this fusion splice.
With reference to Figure 14, reference character 246 expression resin fuel tanks, it is by will be by outer 246a and the internal layer 246b that adopts the HDPE resin to make, and by the blocking layer 246c that good EVOH (ethylene-vinyl alcohol copolymer) resin of the anti-fuel permeability of employing the is made formation that is stacked.
Reference character 248 is represented melting welding and is integrated into the resin system fusion splice of fuel tank 246.This fusion splice 248 comprises as the cylindrical portion 252 of pipe 258 joint (auxiliary section) with in the fusion-welded portion 250 of this fusion splice base end part, and it makes fusion-welded portion 250 be fixed to fuel tank 246 by thermofussion welding.
Cylindrical portion 252 comprises skin 254 and the internal layer 256 by adopting the different resins material to make.More specifically, outer 254 by adopting the resin material identical with the material of fusion-welded portion 250 to make, and internal layer 256 is made by adopting barrier material such as PA (polyamide) resin, and this barrier material has the more excellent anti-fuel permeability of resin material than outer 254.
Incidentally, reference character 260 expression hose clips, it clamps pipe 258 under mated condition.
In the fusion splice 248 of this kind structure, when but the skin in the cylindrical portion 252 254 and fusion-welded portion 250 are made by the HDPE resin of the same material that fuel tank 246 is had the height heat sealability, this HDPE resin demonstrates not enough anti-fuel permeability (therefore, the internal layer of cylindrical portion 252 is made by the barrier material in the fusion splice shown in Figure 14 248).Therefore, even can guarantee anti-fuel permeability, also we can say by the fusion-welded portion 250 that adopts the HDPE resin to make to be in " naked state ", so the problem that the fuel in the fuel tank 246 ooze out by fusion-welded portion 250 is intrinsic for cylindrical portion 252.
In addition, in the fusion splice 248 of structure shown in Figure 14, internal layer 256 and skin 254 and fusion-welded portion 250 are general Unitarily molded by the double color injection mould-forming.When fusion splice 248 is made of multiple material in this way, exist moulding technology to increase and the therefore cost intrinsic problem of corresponding rising inevitably.
For head it off has been made the present invention.
Incidentally, JP-A-2002-241546 is a prior art.
JP-A-2002-241546 discloses the technology with polyolefin alloyization with EVOH (ethylene-vinyl alcohol copolymer).
Summary of the invention
The present invention as its background, and will provide a kind of fuel that can solve smoothly to ooze out the fusion splice of problem from fusion-welded portion as its purpose with above-mentioned situation.
Another purpose is that mouldability by improving fusion-welded portion in the fusion splice and cylindrical portion is to reduce cost.
Another purpose is by improving the anti-sagging nature of pipe anti-shedding part again, stop Drop-proof power in time passing and reduce.
A purpose is to prevent that the fuel in the fuel tank from oozing out through the opening and the skin of fuel tank again.
According to a first aspect of the invention, provide a kind of fusion splice, it comprises: cylindrical portion, and it is as joint; With annular fusion-welded portion, it is arranged in the cylindrical portion base end part, and this fusion-welded portion is constructed to thermofussion welding to resin fuel tank; Wherein, to small part fusion-welded portion and cylindrical portion by adopting resin alloy material monolithic molding, in this resin alloy material, the modification high-density polyethylene that will obtain by the functional group that introduces the hydroxyl high-affinity of ethylene-vinyl alcohol copolymer with ethylene-vinyl alcohol copolymer separately or with the high density polyethylene (HDPE) alloyage.
According to a second aspect of the invention, fusion-welded portion and cylindrical portion constitute by adopting single resin alloy material monolithic.
According to a third aspect of the invention we, fusion-welded portion constitutes by the first portion that adopts the resin alloy material with first portion Unitarily molded second portion, but this second portion adopts and is different from the material of first portion and has resin with the heat sealability of fuel tank, and this first portion and second portion all by melting welding to fuel tank.
According to a forth aspect of the invention, second portion constitutes by adopting the resin alloy material, and is higher than ratio in first portion in the ratio of second portion middle-high density polyethylene/vinyl-ethenol copolymer.
According to a fifth aspect of the invention, fusion splice further comprises anti-shedding part, it is arranged on the cylindrical portion outer surface, preventing that being connected member autogenous welding joint comes off, and comprises that the skin of anti-shedding part constitutes by adopting the good high-intensity resin of anti-sagging nature.
According to a sixth aspect of the invention, but fusion splice further comprises the height blocking layer, and it adopts anti-fuel permeability to be better than the resin of resin alloy material, and it is as the internal layer setting of cylindrical portion.
According to a seventh aspect of the invention, fusion-welded portion is centered on the end face of the opening melting welding of fuel tank to fuel tank, this fuel tank has the mesosphere of being made by ethylene-vinyl alcohol copolymer.
According to an eighth aspect of the invention, fusion splice further comprises extension part, its opening by fuel tank and cylindrical portion are on the contrary to the fuel tank inner projection, it is connected to the resin system sleeve pipe (casing) that is configured in the fuel tank by melting welding, and it adopts the resin that is better than the resin alloy material with the melting welding performance of this sleeve pipe.
As mentioned above, according to the present invention, to small part fusion-welded portion and cylindrical portion by adopting resin alloy material monolithic molding, in this resin alloy material, the modification HDPE (high density polyethylene (HDPE)) that will obtain by the functional group that introduces the hydroxyl high-affinity of EVOH (ethylene-vinyl alcohol copolymer) with EVOH separately or with the HDPE alloyage of not having this functional group.
Known so far EVOH is the material with excellent gas barrier properties.Wherein with the resin alloy material of this modification HDPE and this EVOH alloyage, because contained HDPE in this alloy material, but have good heat sealability with fuel tank, and it also has the high anti-fuel permeability based on EVOH.Therefore, according to the present invention, fuel can successfully solve from the infiltration problem of fusion-welded portion to the outside, keeps the favourable melting welding intensity of fusion-welded portion simultaneously.
In addition, in the present invention, pass through to adopt resin alloy to constitute as the cylindrical portion of pipe auxiliary section, therefore also can solve fuel at least in part from the problem of cylindrical portion to exosmosis to small part.
According to a second aspect of the invention, fusion-welded portion and cylindrical portion can constitute by adopting the resin alloy material monolithic.
Like this, fusion-welded portion and cylindrical portion can be passed through to adopt single resin alloy effective constitution, thereby molding processing quantity can reduce under the situation of these parts of molding, and mouldability is favourable, and can reduce required cost.
According to a third aspect of the invention we, but fusion-welded portion is by the first portion that adopts the resin alloy material and adopt the second portion that is different from the resin alloy material and has with the resin of the heat sealability of fuel tank to constitute, and this first portion and second portion all by melting welding to fuel tank.
Like this, adopt the melting welding of the first portion of resin alloy material to strengthen, thereby can effectively improve melting welding intensity by the melting welding of second portion.
In the case, second portion is also by adopting the resin alloy material to constitute, and this second portion also can constitute (the 4th part of the present invention) by the different resins alloy material that HDPE/EVOH ratio wherein is higher than the ratio in the resin alloy material that constitutes first portion.In the case, the melting welding intensity of second portion is higher than the melting welding intensity of first portion, and this melting welding intensity can effectively strengthen.
In addition, in the case, also give the good anti-fuel of second portion and ooze out performance.
Incidentally, the part of cylindrical portion also can be by adopting the resin and the first portion that constitute second portion Unitarily molded.
Like this, the contact area between the resin material of the alloy material of formation first portion and formation second portion increases, and can improve the interface adhesion strength between these two-part.
According to a fifth aspect of the invention, the outer surface of cylindrical portion is provided with anti-shedding part, its interior perimeter surface that is connected member by nipping prevents to be connected member and comes off, and comprises that the skin of anti-shedding part can constitute by adopting good high-intensity resin of anti-sag performance such as PA (polyamide) resin.
Like this, even mated condition pressure assembles and is connected under the situation of cylindrical portion beyond the pitch tube quilt that hardened resin is made, can solve anti-shedding part and suffer permanent strain to cause Drop-proof power to be passed in time and the problem that reduces, and can keep high Drop-proof power for a long time.
According to a sixth aspect of the invention, but the height blocking layer that can adopt anti-fuel permeability to be higher than the resin of resin alloy material is set to the internal layer of cylindrical portion.
Like this, can further improve the anti-fuel permeability of whole fusion splice.
According to a seventh aspect of the invention, with fusion-welded portion melting welding to the end face that limits the fuel tank opening.Like this, also can solve the problem that the fuel gas in the fuel tank oozes out by this opening and skin.
According to an eighth aspect of the invention, fusion splice further comprises extension part, its by fuel tank opening and cylindrical portion on the contrary to the fuel tank inner projection, it is connected to the resin system sleeve pipe that is configured in the fuel tank by melting welding, but and its adopt the resin that is better than the resin alloy material with the heat sealability of this sleeve pipe.Like this, obtain sleeve pipe easily melting welding and with the incorporate advantage of fusion splice.
Description of drawings
Fig. 1 illustrates the schematic representation of fusion splice according to an embodiment of the invention;
Fig. 2 A and Fig. 2 B are the perspective view that the substantial section among Fig. 1 is shown;
Fig. 3 is the schematic representation that the state of fusion splice before melting welding among Fig. 1 is shown;
Fig. 4 A to Fig. 4 C is the explanatory drawing that the resin alloy material characteristics that adopts among this embodiment who contrasts with comparative example is shown;
Fig. 5 A is the schematic representation that another embodiment of the present invention is shown;
Fig. 5 B is the schematic representation that yet another embodiment of the invention is shown;
Fig. 6 A is the schematic representation that yet another embodiment of the invention is shown;
Fig. 6 B is the schematic representation that yet another embodiment of the invention is shown;
Fig. 7 is the schematic representation that further embodiment of this invention is shown;
Fig. 8 is the schematic representation that the further embodiment of the present invention is shown;
Fig. 9 A illustrates the present invention's schematic representation of a further embodiment again;
Fig. 9 B illustrates the present invention's schematic representation of a further embodiment again;
Figure 10 is the schematic representation that another further embodiment of the present invention is shown;
Figure 11 is the schematic representation that another further embodiment of the present invention is shown;
Figure 12 A and Figure 12 B are the explanatory schematic representation that the pitch tube of the traditional Placement that is used for fuel tank is shown;
Figure 13 is the schematic representation that the independent degradable member of the linkage structure among Figure 12 is shown; And
Figure 14 is the schematic representation that traditional fusion splice example is shown.
Embodiment
Now, will describe embodiments of the invention in conjunction with the accompanying drawings in detail.
Referring to Fig. 1 and 3, reference character 10 expression resin fuel tanks.Here, fuel tank 10 forms the stacked structure that the internal layer 10b that made by outer 10a, HDPE resin and thin barrier layer (mesosphere) 10c form.
Here, blocking layer 10c makes by adopting the good EVOH resin of anti-fuel permeability.
Mated condition is assembled on the cylindrical portion 16 by pressure beyond the pipe 14, and it is connected with fuel tank 10 by this fusion splice 12.
The outer surface of cylindrical portion 16 is provided with anti-shedding part 22, and it is flexuose that this anti-shedding part 22 has axial a plurality of circular protrusions 20 and its sectional shape separated by a distance.In addition, annular recess 24 is formed on the distal side of cylindrical portion 16, and sealing elasticity O-ring 26 remains in the annular recess 24.
This O-ring 26 plays the effect of setting up sealing between the interior perimeter surface of the outer surface of cylindrical portion 16 and pipe 14.
In addition, anti-shedding part 22, each circular protrusion 20 interlock that limits acute angle with far-end enter the mode of managing 14 internal surfaces, play preventing to manage 14 effects that come off.
The outer surface of cylindrical portion 16 is also locating to be formed with ring-type lug 28 with anti-shedding part 22 position adjacent (in the adjacent position of bottom end side).
The far-end of ring-type lug 28 butt pipes 14, and play the effect of the assembling amount of regulating this pipe.
Equally shown in Fig. 2 A and 2B, fusion-welded portion 18 comprise the plate-like flange part 30 of extending from cylindrical portion 16 outward radials and from the excircle end portion of flange part 30 to the sagging ring-type dip portion 32 of fuel tank.At the end face of dip portion 32, the circumference edge portion of the opening 34 of fusion-welded portion 18 in fuel tank 10 particularly, is integrated into fuel tank 10 at outer 10a place by thermofussion welding.
In the present embodiment, all cylindrical portion 16 in the fusion splice 12, fusion-welded portion 18 and extension part 36 constitute by adopting single resin alloy material.Particularly, the mode of production of resin alloy material is here: will introduce the modification HDPE (high density polyethylene (HDPE)) that the hydroxyl of EVOH (ethylene-vinyl alcohol copolymer) is had the functional group of high-affinity, with EVOH separately or with common HDPE alloyage.
Known so far EVOH is the material with good capacity for air resistance.The resin alloy material of modification HDPE and this EVOH alloyage wherein because of HDPE contained in this alloy material, have the remarkable melting welding performance with fuel tank 10, and it also has the high anti-fuel permeability (barrier properties) based on EVOH.Therefore, according to present embodiment, fuel can successfully solve from the infiltration problem of fusion-welded portion 18 to the outside, keeps melting welding intensity good between fusion-welded portion 18 and the fuel tank 10 simultaneously.
In addition, in the present embodiment, all fusion-welded portion 18, cylindrical portion 16 and extension part 36 constitute by adopting single resin alloy material, so under the situation of these parts of molding, molding processing quantity can be little, and mouldable performance is good, and can reduce required cost.
And in the present embodiment, cylindrical portion 16 constitutes by adopting the good resin alloy material of anti-fuel permeability itself, so can prevent smoothly that fuel is from cylindrical portion 16 infiltrations.
Here, different with common HDPE, with modification HDPE as with the material of EVOH alloyage, this is for underlying cause:
Conventional H DPE lacks the compatibility with EVOH.Therefore, when only planning to be used for conventional H DPE with the EVOH alloyage, because the non-compatibility between them, under they partly were confined to state among the HDPE, EVOH became big block.
Fig. 4 C is illustrated in this state under the close copy pattern.
In the figure, alphabetical A represents the EVOH bulk, and letter b is represented HDPE matrix (Fig. 4 A and Fig. 4 B are the specification of a model figure under the HDPE situation excessive with respect to EVOH) here.
In the case, although the anti-fuel permeability of EVOH itself is good, its bulk A is separated from each other and is confined within the matrix B of HDPE, thus fuel gas easily between the bulk A of EVOH by and ooze out.
This situation is attributable to EVOH and the HDPE fact for the combination of mutually insoluble material, even like this when this two kinds of resins during by physical mixed, they also cause to be separated and to form hangs down the compatibility interface.
As a result, the material that is mixed (material of institute's fusion) becomes the state that wherein comprises as being the EVOH bulk of foreign material.Under this state, blending material intensity step-down, and being easy at the interface between two kinds of resins comes off.
On the contrary, in the present embodiment, with introduce therein hydroxyl with EVOH have chemical reactivity (mainly being hydrogen bonding and covalent bonding) functional group modification HDPE resin as with the material of EVOH alloyage.Shown in the specification of a model figure of Fig. 4 A, EVOH becomes fritter " a " and is evenly dispersed in the HDPE matrix (under the situation of sea-island structure, wherein HDPE forms the sea and EVOH forms the island) and is melted in together state to set up EVOH and HDPE.Therefore, even when fuel gas will permeate, it collides the EVOH piece " a " within the resin alloy material and can not easily penetrate this resin alloy material.As a result, the resin alloy material in the present embodiment has high anti-fuel permeability (barrier properties).
EVOH so becomes small piece " a " and the reason that is evenly dispersed within the HDPE everywhere is, because based on the modification of introducing functional group, HDPE finally demonstrates the high-affinity with EVOH.
And the resin alloy material of wherein EVOH shown in Fig. 4 A and modification HDPE alloyage because EVOH disperses with fritter " a ", has improved the impact resistance and the intensity of material simultaneously.
Here, modification group, the example of promptly introducing the functional group among the HDPE are carboxyl, carbonic ester-acid anhydrides residue, epoxy group, acrylate-based, methacrylate based, vinyl acetate ester group and amino.
In addition, melting welding intensity can strengthen by the ratio that improves HDPE, and anti-fuel permeability can strengthen by the ratio that improves EVOH.The two arbitrary can processing of melting welding intensity and anti-fuel permeability by adjusting ratio after this manner.For this ratio, according to weight, the ratio of EVOH/ modification HDPE is set at 80/20-15/85, preferred 60/40-20/80.
In addition, described HDPE above and formed the sea, and EVOH forms the island, EVOH forms the sea but this resin alloy material also can be configured to wherein on the contrary, and HDPE forms the sea-island structure on island.
Further, owing in mixed, do not comprise any phase solvent, so the anti-fuel permeability of this resin alloy material is good.Yet,, also phase solvent, mineral filler etc. can be blended in this resin alloy material if need.In the case, when excessive interpolation phase solvent, the degree of crystallinity of body material reduces, to improve fuel infiltration performance (reduction barrier properties), so will guarantee therein to add phase solvent within the required barrier properties scope.
In addition, except that modification HDPE separately with EVOH formation alloy, conventional H DPE and modification HDPE also can form alloy with EVOH.
Incidentally, the form that exists of EVOH can be piece a-1 within the matrix B of HDPE, and it is shaped as flat, and along being orientated with the equidirectional shown in Fig. 4 B.In the case, further strengthened anti-fuel permeability.
Fig. 5 A illustrates another embodiment of the present invention.
Present embodiment is: fusion-welded portion 18 comprises the 18-1 of first portion by adopting the resin alloy material identical with the material of cylindrical portion 16 to make, and in addition, be formed on the second portion 18-2 on the outer layer side of the 18-1 of this first portion, and the 18-1 of first portion and second portion 18-2 all melting welding to resin fuel tank 10.
Here, second portion 18-2 is Unitarily molded by double color injection mould-forming and other parts.
Here, second portion 18-2 can adopt melting welding intensity to be higher than the material of the 18-1 of first portion.
In the case, with the 18-1 of first portion similarly, second portion 18-2 can adopt the resin alloy material of being made up of modification HDPE and EVOH.
Yet in the case, in the resin alloy material in second portion 18-2, the ratio of HDPE/EVOH is set at the ratio that is higher than in the 18-1 of first portion.
In the present embodiment, second portion 18-2 in the fusion-welded portion 18 adopts its melting welding intensity to be higher than the resin material of melting welding intensity among the 18-1 of first portion, thereby the melting welding of the 18-1 of first portion can strengthen by the melting welding of second portion 18-2, and can more effectively strengthen melting welding intensity.
In addition, the HDPE/EVOH ratio that is used for second portion 18-2 and this resin alloy material at the resin alloy material of being made up of modification HDPE and EVOH is higher than under the situation of the 18-1 of first portion, except that improving melting welding intensity, can also improve the anti-fuel permeability of fusion-welded portion 18.
Fig. 5 B illustrates an embodiment again.
The example of present embodiment is: wherein the second portion 18-2 in the fusion-welded portion 18 directly extends to cylindrical portion 16 sides, and form cylindrical portion 16 outer field second portion 16-2 by with fusion-welded portion 18 in second portion 18-2 identical materials constitute by double color injection mould-forming integral body.
Incidentally, the far-end of second portion 16-2 no show cylindrical portion 16, and this second portion 16-2 and the 16-1 of first portion limit the annular recess 24 that wherein keeps O-ring 26.
Yet this second portion 16-2 can be configured to have the length that is enough to reach cylindrical portion 16 far-ends.
In the present embodiment, between entire first portion 18-1,16-1 and whole second portion 18-2, the 16-2, promptly the area of contact between the different materials increases, and brings the advantage that strengthens the interface adhesion strength between first portion and the second portion.
Fig. 6 A illustrates an embodiment again.Present embodiment is: the part skin in the cylindrical portion 16 constitutes by the PA resin that employing has good anti-sagging nature, and this part is as the second portion 16-3 in the cylindrical portion 16, and anti-shedding part 22 is formed on second portion 16-3.
Here, second portion 16-3 is circular, and it is imbedded the state molding in the corresponding circular depression 38 that is formed among the 16-1 of first portion.
Incidentally, second portion 16-3 can be configured to have the length that is enough to reach cylindrical portion 16 far-ends, shown in Fig. 6 B.
In these embodiments, even by adopt pitch tube that hardened resin makes as pipe 14 by the pressure assembling and beyond mated condition be connected under the situation on the cylindrical portion 16, anti-shedding part 22 can not take place especially yet suffer permanent strain, the problem that causes Drop-proof power to be passed in time and reduce, and acquisition can keep the advantage of high Drop-proof power for a long time.
Fig. 7 illustrates the further embodiment of the present invention.
The example of present embodiment is: wherein the internal layer in the cylindrical portion 16 constitutes second portion 16-2 by adopting the PA resin that not only anti-sagging nature is good but also anti-fuel permeability is good.
In other words, equally in the present embodiment, cylindrical portion 16 constitutes by forming the outer field 16-1 of first portion and forming the stacked structure that the second portion 16-2 of internal layer forms.
Incidentally, the identical point of present embodiment and the foregoing description is: second portion 16-2 and the 16-1 of first portion are Unitarily molded by the double color injection mould-forming.
In addition, in the present embodiment, plate-like flange part 40 with from the sagging downwards dip portion 42 of the outer peripheral portion of flange part 40 by adopting the identical Unitarily molded bottom end side of PA resin to second portion 16-2, and they are integrally bonded to the internal surface of the fusion-welded portion of making by employing resin alloy material 18.
Yet, flange part 40 and dip portion 42 not by melting welding to fuel tank 10, therefore do not constitute fusion-welded portion 18.
Dip portion 42 is with respect to the far-end of the dip portion in the fusion-welded portion 18 32, has in the figure the upwards far-end of indentation, and limits the slit of being scheduled between the far-end of dip portion 42 and fuel tank 10.
In the present embodiment, the fuel gas in the fuel tank 10 can be by fusion splice 12 and the place of oozing out, and is restricted to the micro gap between the far-end of the fuel tank 10 of the outer circumference portion office of the flange part 40 that second portion 16-2 forms and dip portion 42.And in the present embodiment, fusion-welded portion 18 itself has anti-fuel permeability.Therefore, can more effectively suppress the infiltration of fuel by fusion-welded portion 18.
In addition, in the present embodiment, cylindrical portion 16 has the internal layer that the PA resin constitutes, but this PA resin good height barrier material that is anti-fuel permeability.Therefore, also can more effectively suppress the infiltration of fuel from cylindrical portion 16.
In passing, in the embodiment of Fig. 7, but second portion 16-2 can adopt the height barrier material that is different from the PA resin.
Fig. 8 illustrates further embodiment of the present invention.
The example of present embodiment is: wherein second portion 16-2 constitutes by adopting the good PA resin of anti-sagging nature and anti-fuel permeability, the internal layer that is essentially the cylindrical portion 16 of lower half portion among the figure is made of second portion 16-2 with the whole distal side that is essentially the cylindrical portion 16 of upper half part, and in this second portion 16-2 anti-shedding part 22 is set.
In the present embodiment, second portion 16-2 can further improve the anti-fuel permeability in the cylindrical portion 16, and can improve the anti-sagging nature of anti-shedding part 22 simultaneously, reduces thereby can more advantageously prevent to manage 14 Drop-proof power.
Fig. 9 A and 9B illustrate further again embodiment of the present invention.
Example shown in Fig. 9 A is: in the embodiment in figure 1, the blocking layer 10c of the outer 10a of the HDPE resin in fuel tank 10 and internal layer 10b and EVOH resin in the figure, circumference edge portion place at opening 34 is bent upwards respectively, so the end face of layer 10a, 10b and 10c upwards exposes, so that fusion-welded portion 18 (under the state before the melting welding) thermofussion welding is to this end face.
In addition, example shown in Fig. 9 B is: in the embodiment of Fig. 5 B, the circumferential edge portions office of outer 10a, internal layer 10b and the opening 34 of blocking layer 10c in fuel tank 10 is bent upwards similarly, so the end face of these layers upwards exposes, so that fusion-welded portion 18 (under the state before the melting welding) thermofussion welding is to this end face.
Like this, also can solve the problem that the fuel gas in the fuel tank 10 oozes out through opening 34 and outer 10a.
More specifically, in the various embodiments described above, can prevent that fuel from itself oozing out from fusion-welded portion 18, but still worry that the fuel gas in the fuel tank 10 oozes out through fuel tank 10 outer 10a own from opening 34.On the contrary, according to the embodiment shown in Fig. 9 A and the 9B, but head it off also.
Figure 10 illustrates further embodiment of the present invention.
The example of present embodiment is: wherein, in the embodiment shown in fig. 1, the end face separately of outer 10a in the fuel tank 10, internal layer 10b and blocking layer 10c is exposed to the circumferential surface place of opening 34, and extension part 36 is as second fusion-welded portion 46, so that the outer surface melting welding of fusion-welded portion 46 is to the circumferential surface of the opening 34 of fuel tank 10, the end face of promptly outer 10a, internal layer 10b and blocking layer 10c.
Equally, present embodiment can solve the problem that opening 34 and the outer 10a of fuel gas by fuel tank 10 in the fuel tank 10 oozes out.
Figure 11 illustrates another further embodiment of the present invention.
Present embodiment is: tubular joint 48 is Unitarily molded in advance by the double color injection mould-forming with fusion-welded portion 18 and cylindrical portion 16, this tubular joint 48 is in the opening 34 of fuel tank 10, with cylindrical portion 16 on the contrary to fuel tank 10 inner processes, and be connected to the cylindrical portion 50 that is configured in resin systems such as the valve sleeve pipe in the fuel tank 10 by melting welding; And the cylindrical portion 50 of sleeve pipe is connected to tubular joint 48 by melting welding.
Usually, sleeve pipe is made by adopting the PA resin, and correspondingly the PA resin can be suitably as the material of joint 48.Yet, can also adopt modification HDPE resin as previously mentioned.
Like this, and to being arranged with by adopting the tubular extension part 36 that the resin alloy material makes and the cylindrical portion 50 direct melting welding of sleeve pipe to compare to the situation of extension part 36, melting welding intensity can strengthen more.
Incidentally, the resin material of preparation joint 48 can be chosen suitably according to the resin material performance of the cylindrical portion 50 that is used to prepare sleeve pipe etc.
In a word, but but the melting welding performance of the resin material of the cylindrical portion 50 of sleeve pipe is better than being used to preparing the melting welding performance of the resin alloy material of fusion-welded portion 18, and cylindrical portion 16 is used for joint 48.
Although describe embodiments of the invention in the above in detail, the invention is not restricted to the explanation here, and in the scope that does not depart from the object of the invention, can carry out the change of each side the present invention.
Claims (16)
1. fusion splice, it comprises:
Cylindrical portion, it is as joint; With
The annular fusion-welded portion, it is arranged in the base end part of described cylindrical portion, and described fusion-welded portion is constructed to thermofussion welding to resin fuel tank;
Wherein, to the described fusion-welded portion of small part and described cylindrical portion by adopting resin alloy material monolithic molding, in described resin alloy material, by modification high-density polyethylene and the described ethylene-vinyl alcohol copolymer alloyage of introducing to functional group's acquisition of the hydroxyl high-affinity of ethylene-vinyl alcohol copolymer.
2. fusion splice according to claim 1, wherein, described fusion-welded portion and described cylindrical portion are constituted by integral body by adopting single resin alloy material.
3. fusion splice according to claim 1, wherein, described fusion-welded portion constitutes by the first portion that adopts described resin alloy material with described first portion Unitarily molded second portion, but described second portion adopts the described material that is different from described first portion and has the resin of heat sealability with described fuel tank, and described first portion and described second portion all melting welding to described fuel tank.
4. fusion splice according to claim 3, wherein, described second portion constitutes by adopting described resin alloy material, and is higher than ratio in described first portion in the ratio of described second portion middle-high density polyethylene/vinyl-ethenol copolymer.
5. fusion splice according to claim 1, further comprise anti-shedding part, it is arranged on the outer surface of described cylindrical portion, preventing that being connected member comes off from described fusion splice, and comprises that the skin of described anti-shedding part constitutes by adopting the good high-intensity resin of anti-sagging nature.
6. fusion splice according to claim 1, but further comprise the height blocking layer, it adopts anti-fuel permeability to be better than the resin of described resin alloy material, but and described blocking layer be set to the internal layer of described cylindrical portion.
7. fusion splice according to claim 1, wherein, described fusion-welded portion centers on the opening of described fuel tank by the end face of melting welding to described fuel tank, and described fuel tank has the mesosphere of being made by ethylene-vinyl alcohol copolymer.
8. fusion splice according to claim 1, further comprise extension part, its opening by described fuel tank and described cylindrical portion are on the contrary to described fuel tank inner projection, be connected with resin system sleeve pipe in being configured in described fuel tank by melting welding, but and adopt the resin that the heat sealability of described sleeve pipe is better than described resin alloy material.
9. fusion splice, it comprises:
Cylindrical portion, it is as joint; With
The annular fusion-welded portion, it is arranged in the base end part of described cylindrical portion, and described fusion-welded portion is constructed to thermofussion welding to resin fuel tank;
Wherein, to the described fusion-welded portion of small part and described cylindrical portion by adopting resin alloy material monolithic molding, in described resin alloy material, modification high-density polyethylene that obtains by the functional group that introduces the hydroxyl high-affinity of ethylene-vinyl alcohol copolymer and high density polyethylene (HDPE) together with described ethylene-vinyl alcohol copolymer alloyage.
10. fusion splice according to claim 9, wherein, described fusion-welded portion and described cylindrical portion are constituted by integral body by adopting single resin alloy material.
11. fusion splice according to claim 9, wherein, described fusion-welded portion constitutes by the first portion that adopts described resin alloy material with first portion Unitarily molded second portion, but described second portion adopts the described material that is different from described first portion and has the resin of heat sealability with described fuel tank, and described first portion and described second portion all melting welding to fuel tank.
12. fusion splice according to claim 11, wherein, described second portion constitutes by adopting described resin alloy material, and is higher than ratio in described first portion in the ratio of described second portion middle-high density polyethylene/vinyl-ethenol copolymer.
13. fusion splice according to claim 9, further comprise anti-shedding part, it is arranged on the outer surface of described cylindrical portion, preventing that being connected member comes off from described fusion splice, and comprise that the skin of described anti-shedding part constitutes by adopting the good high-intensity resin of anti-sagging nature.
14. fusion splice according to claim 9, but further comprise the height blocking layer, and it adopts anti-fuel permeability to be better than the resin of described resin alloy material, and is set to the internal layer of described cylindrical portion.
15. fusion splice according to claim 9, wherein, described fusion-welded portion centers on the end face of the opening melting welding of described fuel tank to described fuel tank, and described fuel tank has the mesosphere of being made by ethylene-vinyl alcohol copolymer.
16. fusion splice according to claim 9, further comprise extension part, its opening by described fuel tank and described cylindrical portion are on the contrary to described fuel tank inner projection, be connected with resin system sleeve pipe in being configured in described fuel tank by melting welding, but and adopt the resin that the heat sealability of described sleeve pipe is better than described resin alloy material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004308957 | 2004-10-22 | ||
| JP2004308957 | 2004-10-22 | ||
| JP2005192915 | 2005-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1763408A true CN1763408A (en) | 2006-04-26 |
Family
ID=36747676
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510109535 Pending CN1763408A (en) | 2004-10-22 | 2005-10-21 | Welding joint of fuel tank |
| CNB2005101095334A Expired - Fee Related CN100394095C (en) | 2004-10-22 | 2005-10-21 | Welding joint of fuel tank |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101095334A Expired - Fee Related CN100394095C (en) | 2004-10-22 | 2005-10-21 | Welding joint of fuel tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1763408A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5378991B2 (en) * | 2006-05-12 | 2013-12-25 | ビーエフエム テクノロジー リミティド | Cuffed connection system for ducts and tubular members |
| DE102008036538A1 (en) * | 2008-08-06 | 2010-04-22 | Kautex Textron Gmbh & Co Kg | Motor vehicle fuel tank |
| JP6070440B2 (en) * | 2013-02-15 | 2017-02-01 | 豊田合成株式会社 | Lubrication device |
| CN103227448B (en) * | 2013-03-26 | 2016-01-20 | 上海捷锦电力新材料有限公司 | A kind of waterproofing type prefabricated cable straight coupling |
| EP3124305A1 (en) * | 2015-07-31 | 2017-02-01 | Plastic Omnium Advanced Innovation and Research | A liquid vehicle tank comprising fastened component |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5139043A (en) * | 1990-08-24 | 1992-08-18 | Ford Motor Company | Weldable vapor vent valve |
| ES2282092T3 (en) * | 1999-03-04 | 2007-10-16 | Kuraray Co., Ltd. | FUEL TANK. |
| JP2001287269A (en) * | 2000-04-07 | 2001-10-16 | Kyosan Denki Kk | Bonding structure of resin part |
| JP3914733B2 (en) * | 2000-11-02 | 2007-05-16 | 株式会社ニフコ | Fuel tank connector |
| JP2002241546A (en) * | 2001-02-22 | 2002-08-28 | Toray Ind Inc | Member for fuel treatment |
| JP4026322B2 (en) * | 2001-03-01 | 2007-12-26 | 豊田合成株式会社 | Manufacturing method of welded joint for fuel tank |
| JP4134779B2 (en) * | 2003-03-25 | 2008-08-20 | 豊田合成株式会社 | Fittings and fuel shut-off valves |
-
2005
- 2005-10-21 CN CN 200510109535 patent/CN1763408A/en active Pending
- 2005-10-21 CN CNB2005101095334A patent/CN100394095C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1763407A (en) | 2006-04-26 |
| CN100394095C (en) | 2008-06-11 |
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