KR950004306B1 - Feul tank - Google Patents

Abstract

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Description

Resin Fuel Tank

1 is a sectional view showing the main parts of a first embodiment (a) and a second embodiment (b) of a resin fuel tank according to the present invention.

2 is a sectional view showing the main parts of a third embodiment (a) and a fourth embodiment (b) of the copper tank;

3 is an overall side view of a scooter motorcycle including a resin fuel tank according to the present invention;

4 is a side view of a couple of motorcycles showing a portion where the resin fuel tank of FIG. 3 is mounted.

5 is a top view of a resin fuel tank according to an embodiment of the present invention;

6 is a side view of the resin fuel tank of FIG.

7 is a cross-sectional view taken along line VII-VII of FIG. 5,

8 is a cross-sectional view taken along the line VII-VII of FIG. 5,

9 is an enlarged plan view of the resin fuel tank installation portion of the motorcycle;

10 is a side view of the resin fuel tank installation portion of FIG.

11 is a cross-sectional view taken along the line XI-XI of FIG.

12 is an exploded perspective view of the resin fuel tank installation portion,

FIG. 13 is an explanatory diagram for explaining blow molding of a fuel tank in a receiver; FIG.

14 is an external view of the tank in the state removed from the mold,

15 is a side view of the fuel tank mounting stay portion made of resin;

16 is a plan view of the mounting stay portion of the resin fuel tank of FIG.

FIG. 17 is a sectional view taken along line XVII-XVII of FIG. 16 showing a state when forming a mounting stay with a mold;

FIG. 18 is a sectional view like FIG. 17 showing another embodiment.

* Explanation of cold protection symbols in the main parts of the drawings

1: resin fuel tank 2: front wheel

3: front fork 4: hedopipe

5: handle 6: body frame

7: downpipe 8: frame pipe

9: rear wheel 10: swing unit

11 body cover 12 seat

13: Floor 14: Mounting Stay

15: cross pipe 16: mounting part

17 bolt 18 bolt insertion hole,

19: rubber part 20: washer member

21: nut 22: mountain rubber

23 plate member 24 recessed portion

25: elastic part 26: band-shaped part

27: hole 28: bolt

29: floor plate 30: parison

31: extrusion mold 32: mold

33: mold surface 34: sealing portion

35: recess 36: recess

37: block portion 38: stenosis

39: concave groove 52a: container body

53, 54, 55: welding member 52c, 52h: valley part

53c, 54a: flange 52e: convex

54: convex portion 52j: barrier layer

The present invention relates to a resin fuel tank which prevents the storage of fuel from permeating by a barrier layer formed in the wall, in particular, a rigidity of the mounting stay with respect to the resin fuel tank and especially the vehicle body frame to secure the bonding strength of the resin welding member. It relates to a resin fuel tank to be secured.

As a method of manufacturing a resin fuel tank, a pipe or parison of tubular shape or bag shape is trapped in a mold under heating, and compressed air is blown into the mold to expand and cool the mold cavity. There is a blow molding method to be molded to fit.

When blow molding the container body of a resin fuel tank, a technique of preventing the permeation of the stored fuel from the container body wall by forming a barrier layer in the container body wall by attaching nylon or the like in a layered form with an adhesive (e.g., For example, Japanese Patent Laid-Open No. 63-242722 and the like are generally known.

However, the welding fusion of the welding member and the barrier layer in the container body wall is poor. In the case where a welding member formed of the same resin as the base of the tank and the like is welded to the base, the welding strength is lowered when the barrier layer is exposed to the adhesive surface. In addition, when welding the welding member to the thin gas wall, there is a problem that the joining quality is deteriorated because the gas wall is bent due to the pressing force and the joining surface does not touch.

In the case of blow molding method, the mounting stay of the fuel tank forms protrusions on which the wall portions overlap each other on the outside of the parison, and clamps the protrusions with a pair of molds to squeeze the overlapping wall portions integrally, and compresses the inside of the parison. It is formed by blowing air and blowing it into a predetermined shape.

In the case of integrally molding the mounting stay in the tank body of the fuel tank manufactured by blow molding, for example, Japanese Patent Application Laid-Open No. 58-81823, As shown in the figure, V-shaped grooves are formed in the inside of the portion to easily be notched, thereby limiting the rigidity of the mounting stay portion.

In order to solve the above problems, the welding member formed of the same resin as the container body is welded and welded along the barrier layer with the edge of the container wall as the joining surface, and the pressure at the time of welding is formed by bending the container body wall near the joining surface. The bend part which supports is arrange | positioned and joined.

Since the barrier layer in the container body wall is formed parallel to the joint surface, the barrier layer is not interposed between the welding member and the container body wall, and the folded surface is melted and integrated to secure the joint strength, and is placed close to the joint surface. The bends are welded and joined in a state where the front face of the joining surface abuts while supporting the pressing force during melting.

In the present invention, the mounting stay of the resin fuel tank is molded integrally with the tank molding body, and at the same time as the portion adjacent to the tank gas of the mounting stay, the inside of the molten resin tank gas in the mounting stay. By expansion molding to form a reinforcing part of the container body.

In the expansion molding, the constriction portion of the mold is pressed into a portion adjacent to the fuel tank container body of the mounting stay, so that the molten resin material is returned to the tank container, whereby the container body is moved inwardly. Notch-shaped concave grooves, which are formed on the inner surface of the tank gas and are expanded, are eliminated.

An embodiment of the present invention will be described below based on the drawings.

FIG. 3 is an overall side view of a scooter type motorcycle having a resin fuel tank 1 according to the present invention. The front shaft 3 supporting the front wheel 2 is movably supported by the head pipe 4 and is steered by the upper handle 5. The body frame 6 constituting the skeleton of the vehicle body has one down pipe 7 extending downwardly from the head pipe 4 and branched from the lower end of the down pipe 7 to the left and right to a substantially horizontal direction. It consists of a pair of left and right frame pipes 8 extending rearward, each frame pipe 8 facing upward from the rear, and then extending upward of the rear wheels 9 rearward. The rear wheel 9 is rotatably mounted to the frame pipe 8 via the switching unit 10 in an upward direction.

The body frame 6 is covered by the body cover 11, and the sheet 12 is mounted on the rear upper portion. The front of the sheet 12 is a low floor 13, and a fuel tank 1 is supported by the frame pipe 8 at the lower part of the floor 13.

With reference to FIG. 4, the structure of the vicinity of the fuel tank 1 is further demonstrated in detail. The two-wheel scooter 5l has a resin fuel tank 1 between the floor plate 51a and the undercover 51b of the scaffold portion, and the pipe 4 is discharged from the outlet port 54 via the pump 42 to the rear. Is connected to the carburetor 43 and reaches the engine 45 together with the air from the air cleaner 44. The resin fuel rank 1 is fixed to the frame pipe 8 constituting the vehicle body frame via the brackets 51d and 51d.

5 and 6, the resin fuel tank 1 is welded and welded to the container body 52a made of a high density polyethylene and the opening of the container body 52a, so that the resin body tank 52a is made of the same resin as that of the container body 52a. It consists of a dye inlet 53 with a welding member made of a molding agent, a fuel outlet 54, a liquid level gauge 55 and the like.

In order to prevent the permeation of fuel to the container body 52a, nylon and the like are adhered together with an adhesive to perform blow molding, and a barrier layer is formed in the wall of the container body. The periphery of the molded container body 52a forms a mounting flange or mounting stay 52b.

The fuel inlet 53 is provided in the opening portion 52d in which the bent portion 52c forming the stage is disposed in the vicinity of the fuel inlet 53, and the female screw 53a is formed in the cylindrical body with the flange. A welding member made of a resin molded body is formed. This welding member fits the cylindrical part 53b into the opening 52d of the container body 52a, and welds the flange part 53c to the container body wall surface around the container body 52a. The inlet lid (not shown) is screwed onto the screw portion 53a. The hole 53d is an air discharge port.

As shown in detail in FIG. 8, the fuel outlet 54 may be formed of a resin molded body in which an opening 52f having a bent portion 52c disposed in the vicinity thereof may be provided, and forms an L-shaped cylinder with a flange. It forms a welding member. The utilization welding member is inserted into the opening 52 of the container body 52a, and the flange portion 54a is welded to the container body wall surface around the opening 52f of the container body 52a. The lower end of the cylinder 544b faces the recess 52g at the bottom of the tank 1, and the upper part of the body 54b is turned off in parallel to the upper surface of the container body 52a to connect a fuel pipe (not shown) to form an inverted L. do.

The liquid level gauge 55 is mounted to a flange-shaped welding member 55a welded around the opening 52i located in the recess 52h formed in the upper surface of the base 52a of FIG. The liquid level gauge 55 has a float 55b that rises and falls in accordance with the position of the liquid level, and displays the amount of fuel storage in the tank by an indicator of a meda panel, not shown, corresponding to the position of the float 55b.

In FIG. 1, the welding members 53 and 54 are welded on the container body wall which forms the shaping surface of the container body 52a. Bond. The barrier layer 51j in the wall of the container body is formed in a layered form parallel to the wall of the container body by nylon or the like bonded when the container 52a is blow molded, and prevents the storage fuel from penetrating the container body wall.

In the vicinity of the junction between the container body 52a, the welding members 53, and 54, a bent portion 52c having rigidity capable of supporting the pressing force during welding is disposed. The shape of the bent portion is composed of a peripheral wall of the end of the container body 52a of the same drawing plane A, a bent part independent of the drawing drawing B, and the like.

Convex portions 52e and 54c are formed in advance in an annular shape at the joint portion where the wall 멱 of the container body 52a and the welding members 53 and 54 abut. The annular convex portions 52e and 54c increase the pressure on the top surface of the convex portion due to the welding pressure, thereby facilitating welding and at the same time serving as a seal function. The annular block portions 52e and 54c of the joining portion are formed concentrically in one or each of the regions where the joining of the container body 52a abuts or the joining flanges 53c and 54a on the welding member side. You may also

The blow molding process of the container body is performed by extruder adhering molten high density polyethylene, modified nylon and adhesive to push the brand body into the mold from the ring-shaped dark outlet through the mold, and at the same time, the anozzle passes from the bottom or side of the mold. Air is blown into the center of the brand body forming a shape, and the normal brand body is inflated by the pressure of the air, and molding is performed by a mold.

In the thus formed container body, modified nylon is formed in a layer shape in a direction extruded from the extruder, that is, parallel to the surface of the container body, and the layered nylon forms a barrier layer that prevents fuel permeation.

The molded container body is formed by forming a hole at a predetermined position in the embodiments (A) and (B) of FIG. 1, and then heating the surface joint of the container body and the welding member by a hot plate at a predetermined temperature for a predetermined time. The welding member is fusion bonded because of pressure and time.

In addition, as shown in Fig. 2A, after welding the welding member 53f to the surface of the container body 52a, the cooling and hole formation of the inner welding burr 52k are simultaneously cut and processed. , The container body 52a of the same figure B is bent outwardly and spaced in the outer periphery of the curved part 52c, and the welding member 53g is welded to receive the welding burr 52k at the interval. .

Table 1 shows a comparison of welded joint strength.

The following results were obtained by comparing the bonding strength of the resin fuel tank containing no barrier layer in the bonding combination when the end surface of the A member was welded on the side surface of the B member as a reference.

Table 1

The first configuration of AB is a high-density polyethylene (HDPE) -free barrier layer, the second configuration is welded from the side of the member including the barrier layer, and the barrier layer is formed of a member including the barrier layer on one side. Comparing the third constitution welded in the cross section perpendicular to the barrier layer of the member including the hot plate, the hot plate melting conditions are 200 ° C. and 60 seconds (indicated by * in the table). It can be seen that a certain strength is obtained with respect to.

According to this result, it is estimated that the 3rd structure aggregated in the direction orthogonal to a barrier layer is influenced by the barrier layer exposed by the bonding surface. In addition, in the second configuration, when the hot plate melting condition is set to a high temperature for a long time, a decrease in the bonding strength is found, which is presumed to be due to the same phenomenon as the second case as a result of the barrier layer being exposed to the joint surface as the melting proceeds.

In addition, the member including the barrier layer is formed by forming a barrier layer parallel to the member side surface, and the direction of the barrier layer is visually confirmed by cutting the bonded sample and dyeing the nylon part exposed on the cut surface.

Next, when the resin fuel tank including the barrier layer is formed by using the blow molding method, the mounting stay can be integrally formed in the tank gas according to the present invention.

Prior to the description of the process for the integrated molding method, the structure and operation of the mounting stay will be described.

9 is an enlarged plan view of a fuel tank installation portion of the scooter type motorcycle, and FIG. 10 is a side view thereof. 11 shows a cross section taken along VI-VI, and FIG. 12 shows an exploded view of each part.

The mounting stay 14 is integrally protruded from the center of the rear end face of the fuel tank 1, and the mounting stay 14 is fixed to the cross pipe 15 connecting the left and right frame pipes 8. Is mounted on the bolt 17. That is, the bolt 17 which inserted the bolt 17 through the rubber part piece 19 and the washer member 20 in the bolt insertion hole 18 of the mounting stay 14, and penetrated the mounting part piece 16 by the tip part 17 of the bolt 17 The mounting stay 14 is fixed to the mounting part piece 16 by screwing the nut 21 into the screw.

In this way, the rear end of the fuel tank 1 fixed to the mounting portion 16 through the mounting stay 14, that is, the vehicle body frame, is mounted on the left and right sides of the front surface of the front surface of the mounting pipe 22 on the left and right frame pipes 8, respectively. (See FIG. 11) and mounted on the framepipe (8).

Plate members 23 are respectively protruded and fixed to the frame pipes 8 on the left and right sides along the longitudinal direction of the frame pipes 8. These plate members 23 are bent from the top to the outside to form a flat top surface 23a.

On the other hand, an elliptical concave portion 24 long in the longitudinal direction of the fuel tank 1 is formed in the center near the front surface of the upper surface of the fuel tank 1, and the elastic portion piece made of rubber or the like on the concave portion 24 ( The upper part 25 protrudes from the recessed part 24, and is fitted. In addition, a band-shaped piece 26 made of metal such as steel extends from the upper surface of the fuel tank 1 in the left-right direction at a position in the upper direction of the concave portion 24, and the tip portion of the small diameter portion of the elastic portion 25 has a small diameter. Is fitted in the hole 27 of the strip | belt-shaped piece 26. As shown in FIG.

Both ends of the strip-shaped piece 26 are bent downward along both sides of the fuel tank 1, and the lower end is a flat flange portion 26a. The upper surface 23a of the plate member 23 of the flange portion 26a is integrally fastened by the bolt 28. At this time, the elastic part piece 25 is pressed by the strip | belt-shaped part piece 26, and is compressed. Therefore, the force tightened and tightened by the bolt 28 is transmitted to the fuel tank 1 through the belt-shaped piece 26 and the elastic piece 25, and the lumped fuel tank 1 passes through the mount rubber 22. It is pressed against the frame pipe 9 and fixed to the frame pipe 8.

Since the strip | belt-shaped piece 26 has sufficient rigidity with metal, it also serves as the stay member which supports the floorplate 29 which forms the said floor 13 (FIG. 10). In other words, since the floor plate support stay can be used as the fuel tank fixing member, the number of parts is reduced. The floor plate 29 is formed in the strip | belt-shaped part 26 through the rib 29a which protruded on the back surface, as shown in FIG.

In this way, the fuel tank 1 is fixed by the screw 17 to the mounting part piece 16 by the bolt 17, and the front end part is frame pipe 8 from the upper direction by the strip | belt-shaped piece 26. It is firmly fixed to a predetermined position on the body frame by pressing it firmly). However, since there is only one screw fixing position for the body frame, it is not necessary to make the manufacturing precision of the fuel tank 1 particularly high for mounting. In addition, the rear end portion of the fuel tank 1 during the dimensional conversion of the tank after mounting can slide back and forth relatively with the strip-shaped piece 26, so that the dimensional change can be easily absorbed. Moreover, since the strip piece 26 has sufficient rigidity, the fuel tank 1 is reliably pressed by the frame pipe 8 by the strip piece 26 to obtain a reliable fixing to the body frame. .

The fuel tank 1 is manufactured by blow molding, for example, as shown in FIG. 30 forms a tubular shape from the extrusion mold 31 as a parison, and is extruded in the hot melt state. The parison 30 is sandwiched by molds 32a and 32b on both sides and cut to a predetermined length, and the openings at the front end and the rear end in the extrusion direction are deflected at opposite mold portions as indicated by broken lines in the drawing. It is sealed by compressing and pressing, and the compressed air is expanded by blowing compressed air therein, so that the parison 30 is along the mold surfaces 33a and 33b of the molds 32a and 32b. The fuel tank 1 of the same shape is molded.

Among the flat sealing portions 34a and 34b (13 and 14 degrees) formed at the ends before and after the parison 30, the sealing portion 34a forms a protruding length from the main body portion, and this portion is formed into a mold ( The mounting stay 14 is formed by molding into 32a) and 32b). In the figure, the long encapsulation 34 is formed at the rear end of the parison 30 in the extrusion direction. Since the mounting stay 14 is installed at the rear end of the fuel tank 1 as described above, in this case, the parison 30 is identical to the front and rear of the parison extrusion direction and the front and rear of the fuel tank 1 mounted on the vehicle body. The encapsulation portion 34 may be formed at the front end portion of the extrusion direction, and the fuel tank 1 may be mounted on the vehicle body with the mounting stay molded therefrom.

The encapsulation part 34a removes the remaining protruding part (the oblique part of FIG. 4) by cutting after forming the mounting stay 14, and similarly, the encapsulation part 34b also removes the remaining protruding part (the oblique part of Fig. 4). Remove by cutting. However, as described above, only one of the sealing portions 34a and 34b of the parison 30 open end (34a in this example) is molded into the mounting stay 14, so that the material yield is also improved. Incidentally, in the case where the mounting stay 14 is installed at a place originating around the parison 30, after forming the protrusions (burrs) that are stretched in the front and rear directions by inserting these parts into a mold so that the pipe walls overlap each other in double, Since the required part of this rupture part is shape | molded to the mounting stay 14, and the other part must be divided, the data yield will fall. FIG. 11 is a side view showing the rear end portion of the blow molded fuel tank 1 as described above, and FIG. 16 is a coplanar surface in which the mounting stay 14 protrudes from the tank container 52a. The bolt insertion hole 18 is formed in the mounting stay 14, and recesses 35a and 35b are formed on the upper and lower surfaces of the proximal end adjacent to the container body 52a.

The bolt insertion hole 18 and the concave portions 35a and 35b are formed when the encapsulation portion 34 is molded into the molds 32a and 32b to form the mounting stay 14. For example, as shown in FIG. 7, a recess 36 for forming the mounting stay 14 is provided on a fitting surface between the mold 32b and the mold 32a, and the recess 36 is provided. The convex part 37 for forming the bolt insertion hole 18 is formed in the center of this.

In the portions corresponding to the base ends adjacent to the molds 32a and 32b in the future stay 14, the constriction portions 38a and 38b protruding from each other in the concave portion 36 are formed. The concave portions 35a and 35b are formed by the narrowing portions 38a and 38b. The surface where the constriction part 38a, 38b opposes each other becomes an inclined surface which spreads toward the tank container 52a at the angle (theta) as shown.

When the mounting stay 14 is molded into the molds 32a and 32b, the recessed part 35 is narrowed by the narrowing 38a and 38b. Moreover, since the constriction parts 38a and 38b form the inclined surface which has the angle (theta) which spread toward the tank container 52a as mentioned above, the resin material of the said part is extruded toward the container body 52a. However, since the mounting stay 14 is formed by overlapping and sealing the pipe walls of the open end of the parison 30, the shape of the joint portion of the pipe wall on the portion of the container body 52a is merely 17. As shown by the dotted lines in the figure, the notched recesses 39 remain. However, when the molds 32a and 32b having the constriction portions 38a and 38b are used, the recesses 39 are expanded into the tank by the resin material extruded toward the container body 52a as described above. Since the defect 39 is reduced, the fuel tank 1 which has a smooth inner surface throughout is obtained.

As shown in FIG. 18, the dam-shaped narrowing part 38c as shown in only one metal mold | die may be formed.

Although the present invention has been described with respect to the fuel tank mounted on the floor of the scooter-type motorcycle, the present invention is not limited to this, and can be widely applied to a general vehicle.

As described above, since the resin fuel tank according to the present invention is welded to the joint surface parallel to the layer of the burr in the container body wall, the barrier layer is not interposed between the welding member and the container body wall. The surface is melted and the bonding strength is secured, and the bent portion disposed in the vicinity of the bonding surface supports the pressing force during welding and the contact of the entire surface of the bonding surface is secured, thereby improving the bonding quality.

Therefore, the outlet part of the resin fuel tank made to prevent the permeation of fuel by the barrier layer can be later attached by the welding member. As a result, in accordance with the fuel permeation effect, there is an effect such as reduced weight of the container body, multi-model response, and mold cost reduction by using a common mold.

According to the method of the present invention, the tank wall rigidity of the mounting stay forming portion can also be increased.

Claims (3)

In the fuel tank made of a resin, a barrier layer such as nylon is formed in the wall of the tank to prevent fuel permeation, and at the same time, a welding member formed of a resin that is the same as the container body of the tank is formed on the wall of the container body along the barrier layer. A resin fuel tank, wherein the surface is welded and welded to the joint surface. 2. The resin fuel tank according to claim 1, wherein the container body wall is formed to bend the vicinity of the joining surface of the container body wall to which the welding member is to be fusion-bonded to support the pressing force during welding. The method of claim 1, wherein the mounting stay is molded integrally with the tank forming body, and the molten resin in the mounting stay is expanded into the tank body at a position corresponding to a portion adjacent to the tank gas of the mounting stay. A resin fuel tank comprising a reinforcing portion of a container body.