JPH0137292B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a gasoline tank for an automobile.

<Problems to be Solved by the Invention> Conventionally, automobile gasoline tanks have had both the tank body and the inlet pipe made of metal, which required many steps to form and increased weight. There was a problem.

Therefore, attempts have been made to make these products molded from synthetic resin to simplify the process and make them lighter, but synthetic resin products generate static electricity, and no effective means have been established to remove it. , there is a problem that it has not been put into practical use yet. The present invention attempts to solve such problems.

<Structure of the Invention> The present invention provides a gasoline tank body made of synthetic resin, which is formed by attaching one end of a half freely extending ground wire to a pre-formed wave blocking plate and sandwiching the wave blocking plate inside, and a gasoline tank body made of metal. One end of the other half of the freely extending ground wire is attached to the base of the fuel tank, and the base is inserted into one end of the pipe body, and a synthetic resin inlet pipe is hollow-molded and formed in the gasoline tank body. A method for manufacturing a gasoline tank for an automobile, characterized in that the mouth part and the non-base end of the inlet pipe are connected with a flexible tube such as a rubber hose, and the freely extending ends of both the ground wires are connected. It is in.

<Example> Examples will be described below based on the drawings.

As shown in FIG. 1, the gasoline tank body 3 made of synthetic resin is hollow-molded while supporting a separately molded wave breaking plate 1 at a predetermined position. Wave removal plate 1 is viewed from above W
A retaining ring portion C is provided at the tip of a support rod B that is fixed to the outer surface of one wing and extends,
This retaining ring portion C is supported by fitting it into the protruding cylindrical portion at the upper end of the vertically movable body 8. One end of one and a half ground wires 2 is attached to one wing surface of the wave blocking plate 1, and the other end of the ground wire 2 is freely extended to form an air blowout provided upward in the upper groove of the vertical moving body 8. It is wound around a narrow tube 8'. 9 is a die for feeding out the parison 10, and 7 and 7' are split molds for molding. After the wave blocking plate 1 is moved upwardly and positioned at a predetermined position between the opening and closing split molds 7 and 7' by the upward movement of the vertical moving body 8, the parison 10 is fed out from the die 9 and lowered, and the parison 10 closes the wave blocking plate 1. At the point where the lower end of the parison 10 is located below the split molds 7 and 7', the parison 10 is stopped feeding out, the split mold 77' is closed, and air is injected from the narrow blowing tube 8' to open the tank body 3. Hollow mold. The wave blocking plate 1 is welded and inserted in a horizontally suspended state inside the formed tank body 3, and the support wheel C portion is exposed and the opening is closed.
form C′. The inlet pipe 5 made of synthetic resin has a main body pipe 12 and a thin gas venting pipe main body 11 which is connected to the main body pipe 12 by fixing one end to the side surface of the outer end of the pipe 12.
A metal cap 4 is inserted into the outer end of the main body pipe 12, and the main body pipe 12 is integrally hollow-molded at the same time.

The cap 4 is inserted into the vertical movable body 8 as shown in Fig. 3.
The outer end of the cap 4 is fitted upside down into the groove at the upper end, and the top is closed by fitting the split pieces 14, 14', and the upper end is inserted into the groove at a predetermined position between the opening and closing split molds 13, 13'. move it and position it. One end of the other half of the ground wire 2' is fixed to the inner end of the base cylinder part 4' of the base 4,
The other end is freely extended and is wound and fitted into the narrow blowing tube 8' in the groove. Note that 17 is the ground wire 2'
This is a weight attached to the winding end of the ground wire 2' in order to make it easier to take out the wound portion later. Also 1
8 is a base 4 to promote welding with the parison.
This is a ring made of synthetic resin that is fitted onto the intermediate outer surface of the base cylinder. The inner surfaces of the open/close split molds 13, 13' are connected to the main body pipe 12, the gas vent pipe 11, and the connecting member 1.
1' are integrally molded in a state where they are connected at a predetermined position, and are hollow-molded using the same molding procedure as the tank body 3. Base 4
is tightly inserted into one end of the molded pipe main body 12, and the ground wire 2' is passed into the main body pipe 12 from the inner end of the fixed base cylinder part 4'.

Hollow-molded tank body 3 and inlet pipe 5
By connecting the freely extending ends of the ground wires 2 and 2' outside the tank, and connecting the tank body 3 and the main body pipe 12 and the gas vent pipe 11 with a rubber hose 6, a gasoline tank for an automobile is constructed. It is.

FIG. 5 shows an example in which a large burr is created when the inlet pipe 11 is hollow-molded. The present invention is directed to the split pieces 14, 14' shown in FIG.
is placed on the cap 4 to close the upwardly opened recess of the cap 4, and the inner vertical edges 14a of the split pieces 14, 14' act as a cut between the split molds 13, 13'. This means that the occurrence of burrs is kept as small as possible.

<Effects of the Invention> As described above, according to the present invention, an automobile gasoline tank can be obtained by blow molding synthetic resin, so that the process can be significantly simplified and the weight can be reduced. In addition, the problem of static electricity caused by synthetic resin is eliminated because the ground wire attached to the wave blocking plate connected to the tank body is connected to the metal cap, and is dissipated from the cap through the vehicle body, making it non-hazardous. This has the effect of being Incidentally, when a ground wire is attached to the vehicle body, it is also possible to connect the above-mentioned ground wire to the ground wire through a base to dissipate static electricity.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinally sectional front view showing the gasoline tank molding mold in an open state; Fig. 2 is a partially sectional front view showing the injection port pipe molding mold in an open state; Fig. 3 is an enlarged sectional view of the cap part, Fig. 4 is a partial perspective view of the split piece, Fig. 5 is a sectional view of the cap part where burrs appear, Fig. 6 is an overall front view of the automobile gasoline tank, Figure 7 is the same plan view, 1 is the wave blocking plate, 2 and 2' are the ground wires, 3 is the gasoline tank body, 4 is the base, 5 is the inlet pipe,
6 is a rubber hose, 7 and 7' are split molds for forming the gasoline tank body, 8 is a supporting member that moves up and down, 9
10 is a die, 10 is a parison, 11 is a gas vent pipe, 12 is a main body pipe, 13 and 13' are open/close split molds for forming the inlet pipe, 14' is a splitting piece, and 15 is a recess with an open top surface.

Claims (1)

[Claims] 1. A gasoline tank body made of synthetic resin, which is made by attaching one end of a freely extending ground wire to a pre-formed wave blocking plate and inserting the wave blocking plate inside;
and a synthetic resin inlet pipe made by attaching one end of the other half of the freely extending ground wire to a metal cap and inserting the cap into one end of the pipe body. A gasoline tank for an automobile, characterized in that a flexible tube such as a rubber hose connects the formed opening and the non-base end of the inlet pipe, and connects the freely extending ends of both the ground wires. manufacturing method.