JPH04106014U - vehicle fuel tank - Google Patents

Abstract

(57) [Summary] [Structure] The flange 21 on the lower tank shell 2 side is made to overhang the flange 31 on the upper tank shell 3 side,
After the upper tank shell 3 and the lower tank shell 2 are joined by seam welding, the overhanging part of the flange 21 and the flange 41 provided on the outer plate 4 are joined by seam welding or the like to provide an airtight heat insulating layer A. . [Effect] Out of the two tank shells, at least the outer surface of the lower tank shell 2 on the side that comes into contact with the outside air is covered with an outer plate to form an airtight insulation layer, so there is no risk of corrosion of the tank shell. A heat insulating layer can be formed space-efficiently.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a vehicle fuel tank constructed by joining two tank shells. Ru.

0002

[Conventional technology]

Conventionally, in order to suppress pressure changes inside the fuel tank due to changes in outside temperature, fuel At least the part of the outer surface of the water tank that comes into contact with the outside air is covered with a piece of glass wool, etc. After applying thermal material or mounting the fuel tank on the vehicle body, remove the parts that come into contact with the outside air. Cover with a separately made cover to form a heat insulating layer between the cover and the fuel tank. It is known to do.

0003

[Problem that the idea aims to solve]

Among the conventional methods mentioned above, there are also methods in which the fuel tank is covered with a heat insulating material such as glass wool. If so, there is a problem that the fuel tank will corrode due to the insulating material being infiltrated by rainwater, etc. There is a problem. In addition, if the fuel tank is covered with a separately made cover, the cover A drainage port must be provided to drain rainwater etc. that enters between the bar and the fuel tank. The air inside the insulation layer is ventilated through the drainage port, which reduces the insulation properties and causes In addition, the fuel tank and cover are fixed separately to the vehicle body. There is a risk of interference, and the distance between the cover and fuel tank is required to avoid such interference. There is a problem that more space must be secured, resulting in lower space efficiency.

0004 Therefore, in view of the above problems, the present invention has been developed to prevent the fuel tank from corroding and The purpose is to provide a vehicle fuel tank with excellent insulation and space efficiency. .

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention consists of two tank shells joined together. Place the tank shell side facing the vehicle body and attach it to the vehicle fuel tank mounted on the vehicle body. the outer surface of at least the other tank shell that is in contact with the outside air. It is fixed at the joint of each tank shell above, and there is an airtight gap between the tank shell and the outer plate. It is characterized by having a heat insulating space formed therein.

[0006]

[Effect]

Of the tank shells that form the fuel tank, at least those that come into contact with the outside air when mounted on a vehicle The insulation formed between the outer skin and the tank shell covered by the side tank shell. The layer provides insulation against the outside air. In addition, since the heat insulating layer is airtight, the inside of the heat insulating layer Since the outer panel is directly fixed to the fuel tank, it prevents rainwater from entering the fuel tank, creating a heat-insulating layer. The thickness can be minimized.

[0007]

【Example】

In Fig. 1, 1 is a fuel tank mounted on the underside of the vehicle body 11; In the case of the example, a lower tank shell 2 and an upper tank shell 3 are installed at the respective peripheral edges. The girder flanges 21 and 31 are butted together, and the flanges 21 and 31 are joined by seam welding, etc. 31 are mutually joined to constitute the fuel tank 1. The fuel tank 1 is as described above. In particular, since it is mounted on the underside of the vehicle body 11, the outer surface of the upper tank shell 3 is similar to the vehicle body 1. 1, and contact with the outside air is restricted, but the outer surface of the lower tank shell 11 is exposed to the outside and is always in contact with the outside air, so if the outside air temperature is high, the outside air heat is transferred to the interior of the fuel tank 1 via the lower tank shell 2. There Then, as shown in Fig. 2, the outer surface of the lower tank shell 2 is covered with an outer plate 4, and the lower tank shell 2 is A heat insulating layer A was formed between the tank shell 2 and the outer panel 4. In addition, in the case of this example, Connect the flange 21 on the lower tank shell 2 side to the flange 31 on the upper tank shell 3 side. After joining the upper tank shell 3 and lower tank shell 2, The overhanging part of the flange 21 and the flange 41 provided on the outer plate 4 are also seam welded. etc., to provide an airtight heat insulating layer A. In addition to the above configuration, the configuration shown in Figure 3 is also available. In particular, when joining the lower tank shell 2 and the upper tank shell 3, the outer panel 4 is By bonding, the heat insulating layer A may be formed by omitting one bonding step.

[0008] By the way, in order to further improve the heat insulation properties of the fuel tank 1, the upper tank shell is It is desirable that the side of the vehicle body 3 also have a heat insulating structure that blocks heat transfer from the vehicle body 11 and the like. There Then, as shown in FIG. 4, the outer surface of the upper tank shell 3 is covered with an outer plate 5, and the upper tank By forming an airtight heat insulating layer B between the shell 3 and the outer panel 5, The tank shell 3 side can also have a heat insulating structure. In any of the above embodiments, Since the plate is directly joined to the fuel tank 1, there is no risk of interference between the tank shell and the outer plate. This allows the insulation layer to be reduced to the minimum thickness required, improving space efficiency. It will be done.

[0009] The embodiments of the present invention have been explained in detail above, and the present invention has been registered as a utility model. limited only to what is stated in the claims and not limited to specific embodiments; It is not something that will be done.

0010

[Effect of the idea]

As is clear from the above explanation, according to the present invention, there are two At least the side of the tank shell that comes into contact with the outside air is covered with an outer plate. It forms an airtight insulation layer, so there is no risk of tank shell corrosion. A thermal layer can be formed space-efficiently.

[Brief explanation of drawings]

[Figure 1] Diagram showing how the fuel tank is mounted on the vehicle body

[Fig. 2] Cross-sectional view of the fuel tank according to the first embodiment

[Figure 3] Cross-sectional view of a fuel tank according to the second embodiment

[Figure 4] Cross-sectional view of a fuel tank according to the third embodiment

[Explanation of symbols]

1 Fuel tank 2 Lower tank shell 3 Upper tank shell 4/5 Outer panels A/B Heat insulation layer

Claims (1)

[Scope of utility model registration request] [Claim 1] Consisting of two tank shells joined together,
In a vehicle fuel tank mounted on a vehicle body with one tank shell side facing the vehicle body, the outer plate covering the outer surface of at least the other tank shell that comes into contact with the outside air is fixed at the joint of each tank shell. A fuel tank for a vehicle, characterized in that an airtight heat insulating space is formed between the tank shell and the outer panel.