JPH0525943Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of the structure of a sub-tank that is provided inside a fuel tank of an automobile and supplies fuel to a feed pump to an engine.

Therefore, this invention is a fuel tank that stores the fuel necessary for driving a car, and a sub-tank forms a part of the bottom of the fuel tank as a bottom area inside the fuel tank, and a vertical wall is formed on the bottom of the sub-tank to form a bottom edge. A communication passage is formed around the sub-tank by forming a series of spirals in sequence along the lines, and the proximal end of the communication passage connects to the bottom of the fuel tank, while the terminal end is connected to the inside of the sub-tank to form a communication passage around the sub-tank. This invention relates to a fuel tank structure for an automobile having a fuel tank structure, and in particular, a communication passage formed in the sub-tank from the communication portion at the base end is formed by the inner wall and outer wall of the sub-tank, and at least the inner wall of the inner wall and the outer wall is connected. This invention relates to an automobile fuel tank structure in which a buttful plate is attached over a part of the width of the passage.

<Prior art> Generally, automobiles are equipped with a fuel tank,
Although it can be used with fuel loaded, even if there is a small amount of remaining fuel, it can be used in the same way as when the tank is full, and the fuel level in the fuel tank may become uneven due to tilting of the vehicle body due to turning etc. Due to the change in surface, it is not possible to supply enough fuel to the fuel pump, which hangs down from the top of the fuel tank and is fixed, so a sub-tank is installed inside the fuel tank,
The fuel pump is connected to a tank that prevents the entire amount of fuel from moving, ensuring that there is sufficient fuel available for suction, and ensuring the behavior of the vehicle when turning.

As the species sub-tank, for example,
As disclosed in No. 142221 (Utility Model Publication No. 3-40657), a labyrinth-like passage is formed in the frame by a spiral partition wall, and the passage has a communication part connected to an effective storage part in the sub-tank. The partition wall that narrows and forms the passage is sloped in the height direction and abuts against the partition wall through a notch, and the amount of fuel flowing out is controlled until the car body finally completes the slope. On the other hand, when inflowing, the upper edge of the vertical wall is slanted so that the fuel overflows from the upper edge, making it difficult for fuel to flow out into the sub-tank, but making it easy for fuel to flow into the sub-tank. There is.

<Problems to be solved by the invention> However, the above-mentioned conventional sub-tank structure is effective in meeting the purpose of making it easy for fuel to enter and preventing it from flowing out. In the above-mentioned conventional mode, the height of the surface is related to the height of the extra thickness of the notch from the bottom surface.

In a sub-tank with an open top, if the partition wall is tilted so that fuel can overflow, the liquid level of residual fuel at the center of the tank will be the one with the smaller longitudinal cross-sectional area, that is, the one with the smaller swing span will be the liquid level. Considering that it is advantageous in terms of height, in the conventional sub-tank, the effective storage portion within the frame excluding the communication path inside the sub-tank is substantially used.

For the above-mentioned reasons, the conventional sub-tank has the disadvantage that the bottom area of the communication portion is bulky, and the liquid level height is reduced due to the nature of the communication function.

The purpose of this invention is to solve the technical problem of the fuel pump supply amount in the fuel tank of an automobile based on the above-mentioned conventional technology, and to Although the sub-tank installed to supply fuel is in communication with the bottom of the fuel tank, a small amount of residual fuel is locally uneven when the vehicle body is tilted, and the fuel stagnates around the fuel pump, causing suction. The sub-tank of the fuel tank structure is designed to ensure a sufficient amount of fuel to ensure stable driving of the vehicle.The structure not only allows fuel to easily enter the sub-tank but prevents it from flowing out. An excellent vehicle that supplies fuel to the fuel pump by maintaining the liquid level as high as possible, avoids engine stall of the vehicle, and allows the sub-tank to be made compact, benefiting the field of application of fuel processing technology in the automotive industry. The aim is to provide a fuel tank for this purpose.

<Means/effects for solving the problems> In accordance with the above-mentioned purpose, the structure of this device, which is based on the scope of the above-mentioned utility model registration claims, is to solve the above-mentioned problems, by installing a fuel tank at the bottom of the fuel tank. The sub-tank has a vertical wall that stands up from the bottom of the sub-tank, which effectively functions as a so-called separator, while at the same time, the communication part that communicates with the bottom of the fuel tank is formed by an open opening formed by the spiral frame of the vertical wall. This allows the sub-tank to supply fuel to the fuel pump while suppressing the movement of the entire amount of fuel within the fuel tank during driving conditions such as when the vehicle is turning when a small amount of fuel is loaded. However, among the communication paths formed by the inner and outer walls of the sub-tank formed by the spiral framing of the vertical wall, on the side where the vehicle body slopes, at least the inner wall of the sub-tank is lower than the bottom of the sub-tank. By attaching an extended buttful plate to suppress spilled fuel and increase the effective liquid level, fuel can be stored and secured in the area defined as a sub-tank to supply the required fuel to the fuel pump. This was achieved by taking technical measures to achieve this goal.

<Example> Next, an example of this invention will be described below based on the drawings. Incidentally, although the vehicle body tilts from left to right, the description will be given assuming that the vehicle body is tilted in one direction as an example.

In the embodiment shown in FIGS. 1 to 3, reference numeral 1 denotes a flat-bottomed fuel tank, which is a normal mode built into an automobile, and a sub-tank 2 installed at the center of the vehicle body on the internal bottom surface of the fuel tank 1.
It is a container-shaped resin part molded separately from the sub-tank 2, and as shown in Fig. 1, a standing wall 4 on the bottom surface 3 of the set area has a predetermined height and a substantially rectangular shape, and the sub-tank 2 is spaced at predetermined intervals. It is formed in a spiral shape inward, and the spiral standing wall 4 has an inner wall 5 and an outer wall 6 on three sides.
forming an inner wall 5' of the two opposing sides, and
The outer wall 6' is formed in a descending state toward both ends of the vertical wall 4.

Further, a communication path 3' is formed between the inner wall 5 and the outer wall 6, and its base end 7 and terminal end 8 serve as communication sections, and the base end 7 is opened at the bottom of the fuel tank 1, and the terminal end 8 is connected to the sub-tank 2. It is open at the bottom.

The communication passage 3' is provided with a buttful plate 9 on the inner wall 5'' on the side that is inclined together with the vehicle body in the fuel tank 1 near the base end 7 over a predetermined length so as not to close the entire width of the separation interval of the communication passage 3'. It is provided at a predetermined height.

As shown in FIG. 2, if the vertical plate 9 is at the height of the horizontal line a connecting the upper edge 10 of the standing wall 4 of the sub-tank 2 in the most inclined state of the automobile and the opposing bottom edge 11 of the sub-tank 2. Since the slope of the vehicle body is released, fuel 12 flows into the sub tank 2 from the communication part of the fuel tank 1, that is, from the base end 7.
It is not a hindrance to this.

In the above configuration, when the height of the fuel liquid in the fuel tank 1 drops to an extent below the height of the vertical wall 4 of the sub-tank 2, the sub-tank follows the fuel tank 1 when the vehicle body is turning, etc. 2 is inclined, and the fuel 12 in the sub-tank 2 flows out from the sub-tank upper edge 10 and the communication passage 3' to the outside, that is, to the fuel tank 1.

The liquid level of the fuel 12 in the final state that has flowed out is equal to the horizontal line b shown in FIG. Stabilize.

This liquid level height appears higher than the liquid level height in the prior art in the same state shown by the broken line in FIG. 2 because the buffer plate 9 dams up the fuel 12 flowing out through the communication path 3'. .

Thus, the fuel 12 is also retained in the communication passage 3', and the liquid level can be kept high, allowing the entire sub-tank 2 to function effectively.

Note that when the vehicle body is tilted in the opposite direction to the mode described in the above-described embodiment, the liquid level will reach the final state where it overflows the inner wall 5, so the height of the inner wall 5 will be a factor.

In this case, if the height and side length of the inner wall 5 are determined by design modification, and the sub-tank 2 is appropriately offset from the center of the vehicle body and installed inside the fuel tank,
The same amount of fuel is stored in the sub-tank 2 when the vehicle body is tilted to the left or right.

Furthermore, when the fuel 12 in the fuel tank 1 flows into the sub-tank 2, the outer wall 6' of the base end 7, that is, the communication part, is formed into a slope shape, so that it overflows from the upper edge of the outer wall 6'. The structure is easy to enter.

It goes without saying that the embodiment of this invention is not limited to the first embodiment described above; for example, the buttful plate 9 may be attached at any position on the inner wall 5'' on the inclined side of the communication path 3', When attached near the terminal end 8, although the fuel content in the sub-tank 2 decreases, the liquid level remains the same as in the above-mentioned embodiment, and the effect remains the same. The fuel flowing out from the sub-tank is difficult to flow out due to the resistance of the buttful plates 9, 9, etc., while the fuel flowing into the sub-tank 2 is placed in alternate positions. The height is such that unless the fuel in the fuel tank 1 is extremely small, it will not be obstructed and will easily flow into the fuel tank 1, and of course there is no change in its operation and effect.

<Effects of the invention> As described above, according to this invention, the sub-tank installed in the fuel tank of an automobile determines the fuel liquid level when the vehicle body is tilted by using the area occupied by the sub-tank on the bottom of the fuel tank. is possible,
The liquid level is higher than that of the conventional sub-tank, and the fuel pump can be supplied with fuel, and when the fuel tank contains a small amount of fuel, the sub-tank's function works effectively, and when the car is turning, etc. An excellent effect is achieved in that fuel can be supplied to the fuel pump even while the vehicle is in a running state with an incline and the vehicle continues in that position.

Furthermore, the sub-tank prevents the inability to supply fuel to the fuel pump when the fuel in the fuel tank becomes rippled due to a sudden start of the car, etc., and a so-called separator is installed inside the fuel tank. There is no need to provide one, and this provides an excellent effect in that there is no disadvantage in the number of parts for the fuel tank itself or in the assembly process.

In addition, the sub-tank can be easily molded and provided at low cost when produced as a resin part, or if the vertical wall and the full plate are molded directly onto the fuel tank, which is also made of resin, the sub-tank can be integrated into the fuel tank. There is also an effect due to the feature of this invention that it is possible to form a carbon fiber, and in this case, the weight can be reduced, which has an excellent effect of contributing to the fuel efficiency of the automobile.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams of one embodiment. Figure 1 is a perspective view of the sub-tank, Figure 2 is a sectional view of Figure 1 when tilted, and Figure 3 is a schematic partial cross-section of the fuel tank. FIG. 4 is a perspective view, and FIG. 4 is a front view of a sub-tank in another embodiment. 1...Fuel tank, 3...Bottom, 4...
Standing wall, 2... sub tank, 7, 8... communication section,
3'...Communication path, 5...Inner wall, 6...Outer wall, 9...
...Batsuful board.

Claims (1)

[Scope of utility model registration request] In an automobile fuel tank structure in which a sub-tank having a series of vertical walls on the bottom surface sharing the same bottom surface inside the fuel tank has a communication part connected to the bottom of the fuel tank, the fuel tank is connected to the sub-tank from the communication part into the sub-tank. A fuel tank structure for an automobile, characterized in that at least the inner wall and outer wall of the sub-tank are provided with a buttful plate in the communication passage through a facing vertical wall.