JPS60229823A - Fuel tank for vehicle - Google Patents

Abstract

PURPOSE:To provide a fuel tank which may be easily formed and fabricated at a low cost while having a high strength and a high quality in sealing, by incorporating an air breed pipe connected at its lower end with a tank body and at its upper end with a fuel filler pipe, integrally with the filler pipe. CONSTITUTION:A fuel filler pipe 2 is connected at its one end to one side of a tank body 1 of a fuel tank T, and at its the end to a fuel supply section. An air- breed pipe 3 is connected at its lower end with the tank body 1 and at its upper end with the fuel filler pipe 2. The tank body 1, the fuel filler pipe 2 and the air-breed pipe 3 are integrally incorporated with each other by blow-molding. Therefore, the facility of fabrication of the tank is satisfactory, and no coupling is required. Accordingly, the tank may have a perfect sealability and is stable its strength so that the practical use and reliability of the tank is sufficient.

Description

[Detailed Description of the Invention] a. TECHNICAL FIELD This invention relates to fuel tanks for vehicles, particularly to resin fuel tanks.

b. Conventional technology Conventional fuel tanks for vehicles are made of steel! ! ! The tank body was formed by forming the O-tsuba shell and the lower shell into a hollow shape and joining them, and the oil supply pipe and the air vent pipe were connected to the tank body through joints, respectively.

However, since the material is iron, it is bulky and has poor manufacturability, so there is a desire for a resin fuel tank, and various molding methods have been considered and proposed, but none of them are effective in terms of cost or quality. However, the reality is that it has not yet reached the level of practical use. The above-mentioned tank is described in detail in Sankaido Edition Automotive Engineering Zenyo, Volume 73, ``Passenger Car Bodies.''

C. Purpose This invention was made in view of the conventional situation,
The purpose of the present invention is to provide a practical vehicle fuel tank that is excellent in terms of cost and quality such as strength and sealing performance, and has good formability. The main body, an oil supply pipe connected to the main body, and an air vent pipe whose lower end is connected to the tank body at the upper end to the oil supply trap are integrally formed by blow molding.

e. In FIG. 1 of the embodiment, / is the tank body 1.21 of the fuel tank T.
i The oil supply pipe connected to one side of this tank body and the other end connected to the oil supply part (not shown), 3, the lower end is connected to the tank body/ic
The tank body, the oil filling pipe, and the air vent pipe 3 are integrally molded by blow molding of VC resin. This fuel tank T is formed by two molds as shown in FIG. One mold y and the other mold! With the end surfaces ga and ja overlapped and in contact with each other, mold both molds! The tank T is integrally molded by feeding resin into the interior to form a resin layer on the entire inner walls of both molds g and t, and then separating the drawing molds a and t from their end faces. Therefore, the tank body/.

Lubricating pipe 3VC and air venting pipe 3VC are each mold parting line AI
+ At + AI will be formed.

Here, the mold parting line A1 of the tank body is formed along the diagonal line of the side surface on the drawing, and a part of this parting line A is
fi is set at the highest position H or a position near it when the tank T is attached to the vehicle, and the mold parting line All at this position and the mold parting line A of the air vent pipe 3,
With the lower end A31? VC so that they are continuous, and then connect the mold parting line A of the oil supply pipe to the mold parting line A of the tank body,
Continuing with other parts A and 2, and air vent-f
The upper end A and tK of the mold parting line A3 of No. 13 are continuous.

With this configuration, the tank body, oil supply pipe λ, and air vent pipe 3 are integrally formed by blow molding. ! It has good construction properties, eliminates the need for joints, has perfect sealing performance, and is stable in strength, making it possible to obtain a fuel tank with sufficient practicality and reliability.

Moreover, part A11 of the mold parting line A of the tank body/
is set near the highest position of the tank T when it is installed in the vehicle, and the mold parting line A3 of the pressure air vent pipe is continuous here, so the number of full-filled passengers of the tank T is determined by the tank body / You can secure the tank to its full capacity (the full tank position is determined by the height of the connection of the air vent pipe to the tank body),
The positive effect on vehicle performance of being able to sufficiently secure the actual valley: yellow of Tank T is significant.

Another embodiment is shown in Fig. In the same figure, explanations that overlap with those in Figure 1 will be omitted, and only the different parts will be explained: the mold parting line A of the tank body.

is formed from the top surface to the side surface in the drawing, and the part All near the highest A of the tank T in the vehicle mounted state in this division A4 is continuous with the lower end A31 of the mold parting line A3 of the air vent pipe 3. I try to let them do it. Mold parting line A for oil supply pipe! extends to the other part A□ of the mold dividing line A of the tank body/, and is a trap so as to be continuous with the upper end Ayo of the mold dividing line #A3 of the air vent pipe 3. In addition, as shown by the imaginary line in FIG. 5, it is also possible to form a 5IC air vent pipe A. Further, FIG. 5 shows another practical example. In the same figure, the mold parting line A of the tank body is formed as a VC along the front diagonal line in the drawing, and part of this parting line A is
ll is set near the highest position of the tank T when it is mounted on the vehicle, and this separation line width and the lower end Asl of the mold parting line A of the air vent pipe 3 are made continuous. The mold parting line A of the oil filler pipe is also continuous with the parting line All at the highest position of the tank T when it is mounted on the vehicle, along with the air vent pipe 3. Figure Z.

The embodiment shown in FIG. 5 exhibits exactly the same effect as the practical example shown in FIG. 2, so the details will be omitted.

f. Effects According to this explanation, the fuel tank is moldable (can be manufactured at low cost, has excellent quality such as strength and sealing performance), and is extremely useful in practice.

[Brief explanation of the drawing]

Fig. 1 is a sketch of a fuel tank according to an embodiment of the present invention, Fig. 2 is a schematic bottom view showing the main parts of the mold of the tank shown in Fig. 7;
FIG. 3 is a sectional view of FIG. 1, and FIG. 9. FIG. 5 is a sketch showing other embodiments. T...Fuel tank, /...Tank body, -...Lubrication pipe, 3...Air vent pipe, G, Ri...Mold, A...
・・Outside the mold of the tank body 1'JIJ fj XAt・・
・Mold dividing line of oil supply pipe, As...air vent 1? mold parting line. Agent Patent Attorney Motosho Ishido 1st case 2nd case Sominato Gsu 5th crime

Claims (2)

[Claims] (1) Tank body and oil supply pipe connected to the body, -F
A fuel tank for a vehicle, which is integrally blow-molded with an air vent pipe whose end is connected to the tank body and whose upper end is connected to the oil supply pipe. (2) The fuel tank is molded using two molds, and a part of the mold parting line of the tank body is set at the highest position when installed on the vehicle or at a position near it, and the parting line at that position and the air vent The mold parting line of the oil supply pipe is made to be continuous with the mold parting line of the pipe, and the mold parting line of the oil supply pipe is made to be continuous with the mold parting line of the air vent pipe at another part of the mold parting line of the tank body. A billing tank characterized by: