JPH0134700Y2 - - Google Patents

Description

[Detailed description of the invention] A sub-tank is fixed to the inner bottom of the main tank, and a fuel supply pump is installed inside the sub-tank.
Alternatively, a liquid fuel tank for a vehicle with one end of the fuel transfer pipe exposed is a device that facilitates resumption of fuel supply when the vehicle is stopped on a slope without knowing that it is running out of fuel. It has come to be used as.

In this device, a tube with one end opened in the sub-tank protrudes into the main tank and the other end opened into the main tank, and when the vehicle is stopped on a slope, the tube opens in the sub-tank or the main tank. One of the openings is above the fuel level to prevent the fuel in the sub tank from leaking into the main tank. However, a small amount of water gets mixed into the liquid fuel that is refilled into the main tank from the time it is shipped from the refinery until it reaches the final consumer, and due to the difference in specific gravity, it accumulates at the bottom of the main tank. When refueling is repeated several times, a scattered film of water about 1 mm in height forms at the bottom of the main tank. Of course, this water film can be drained out through the drain hole, but if you neglect to drain it, water that gets into the tube, fuel supply pump, fuel transfer pipe, etc. may freeze while the vehicle is stopped, especially in cold regions. Interfere with fuel supply.

In order to prevent such accidents in cold regions, water accumulated at the bottom of the main tank a is prevented from entering the opening d of the main tank a of the tube c that communicates the main tank a and the sub-tank b fixed to the inner bottom of the tube. It is necessary to take measures to For this reason, as shown in FIG.
However, in this case, it is necessary to attach the support e to the outside of the molded surface of the sub-tank b by spot welding, which not only complicates the mounting structure but also makes it difficult to prevent rust from spot welding. Since the film disappears due to heat, it has the disadvantage of rusting when it comes into contact with water, and its durability deteriorates.

The present invention eliminates drawbacks such as welding of the support and rusting, and also simplifies the flow of the water film accumulated and scattered in the main tank into the tube and sub-tank when the vehicle turns, etc., where the flow is dramatic. The purpose is to prevent this with a structure that is

An embodiment of the present invention will be described with reference to FIGS. 1 connects the lower body 2 and upper body 3 to flange parts 2a, 3
A sub-tank 4 is fixed to the central part of the inner bottom of the main tank welded by step a, and a fuel supply pump 5 is provided in the sub-tank 4, or the end of the fuel transfer pipe 5 is opened.

Reference numeral 6 denotes a tube that is passed through the sub-tank 4 and has one end 7 opened at the bottom of the sub-tank 4, and the other end 8 of the tube 6 that protrudes into the main tank 1 is connected to the outer wall 4a of the sub-tank 4. In contrast, a small interval S is placed between them.

The actual size of the small gap S is determined by measuring the gap that prevents water from flowing into the sub-tank 4 from the tube 6 due to the difference between the surface tension of the water film and the surface tension of the fuel when the vehicle turns.

As exemplified above, the present invention has a configuration in which the opening at the other end 8 of the tube that communicates the inside of the sub-tank 4 with the inner bottom of the main tank 1 is placed in correspondence with the outer wall 4a of the sub-tank 4 at a small distance S. When the water film accumulated and scattered on the inner bottom of the main tank 1 undergoes a dramatic flow phenomenon when the vehicle turns, etc., the surface tension increases relatively due to the above-mentioned small interval S, causing water to flow into the tube 6. The tube 6 or the tube 6 is prevented from flowing into the sub-tank 4 through the tube, and the fuel having a low surface tension is prevented from flowing into the sub-tank 4 through the tube.
In other words, the small gap S prevents water from flowing into the sub-tank 4 due to the difference in surface tension of the fuel, which prevents engine trouble due to water-filled fuel supply and prevents rust. This has the effect of being able to be prevented by a simple configuration that does not cause it to occur.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view of a sub-tank device with a conventional structure in which a support e is welded, Figs. 2 and 3 show the present invention, Fig. 2 is a longitudinal sectional side view of the center, and Fig. 3 is a transverse plan view. 1 → Main tank, 4 → Sub tank, 4a → Outer wall,
6 → tube, 7 → one end, 8 → other end, S → spacing.

Claims (1)

[Scope of utility model registration request] In a liquid fuel tank in which a sub-tank 4 is fixed to the inner bottom of the main tank 1 and an end of a fuel supply pump or a fuel transfer pipe is provided inside the sub-tank 4, one end 7 is opened into the sub-tank 4. A tube 6 is protruded into the main tank 1, and the other end 8 of the tube is opposed to the outer wall 4a of the sub-tank 4 with a small distance S therebetween, so that the tube 6 is scattered at the inner bottom of the main tank 1 together with the fuel when the vehicle turns. When the water film flows, the surface tension is relatively increased by the small interval S, and the water film is prevented from flowing into the sub-tank 4 through the tube 6 due to the difference in surface tension between the fuel and water. A sub-tank device.