JPS59143723A - Fuel tank of car - Google Patents

Abstract

PURPOSE:To fully take advantage of tank capacity in filling fuel therein by installing a float valve in its hanging attitude on the bottom of an internal connection pipe. CONSTITUTION:An internal connection pipe 40, which connects together upper chambers 21 and 31 partitioned into right and left halves by a recessed part 15, is provided in a tank 10, and a one-way float valve 50 is installed in its hanging attitude on the bottom of the internal connection pipe 40. Since, no fuel remains in the passage of the U-tube 40, which connects together the partitioned upper chambers 21 and 31, ensuring the full connecting function the air in the upper space 31 of a chamber 30 located innermost beyond the recessed part 15 (viewing from an inlet port 2) can be discharged without any obstracles into the upper space 21 of a nearby chamber 20 through the U-tube 40 even if fuel is supplied further. Accordingly, air can be vented smoothly, ensuring fuel supply up to the top of both upper chambers 21 and 31.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel tank disposed below a floor panel of an automobile and having a recess formed transversely in its upper portion for accommodating necessary installation members of the vehicle. This invention relates to a fuel tank for an automobile that is designed to smoothly vent air and fill the tank with fuel.

The fuel tank of an automobile is disposed at the rear of the vehicle body and below the floor panel, and conventionally, as shown in FIG. A recess 217 is formed in the recess 217, and in the recess 217, vehicle body constituent members such as a vehicle body frame, or installation members such as operating members for a propulsion shaft and a rear wheel steering system are disposed.

Therefore, the lower part of the fuel tank 210 is divided into left and right reservoirs 222 and 232 by the plate 218 forming the recess 217.

An inlet 202 is provided in the side panel 201 on either the left or right side of the vehicle body, and the inlet 202 and the fuel tank 2 are connected to each other.
An injection pipe 203 is connected to one side of the fuel tank 10, and an outside air communication pipe 204 is connected to the injection port 202 and the upper wall 211 of the fuel tank 210 in parallel with the injection pipe 203.

By the way, the plate portion 218 forming the recess 217 has r,
I) The lower part of the fuel tank 210 has left and right reservoirs 222.2.
Since the fuel supply pipe to the engine (not shown) is connected to one of the reservoirs, if the remaining fuel level becomes lower than the plate part 218, each part is divided into 32 parts. The remaining capacity levels of the reservoirs 222 and 232 will be different.

Therefore, in the past, in order to equalize the remaining amount level in both reservoirs 222 and 232, the communication pipe 219 was connected to the recess 217.
It was necessary to take measures such as constructing the bridge below the roof.

In order to solve this problem, the present applicant, on the same date as the filing of this patent, formed a transverse recess in the upper part of the fuel tank, and installed vehicle body components such as the vehicle body frame, or the propulsion shaft and the rear in the recess. A patent application has been filed for a fuel tank for an automobile, which is characterized by being installed through an arrangement member such as an operating member of a wheel steering system, and which does not require consideration to equalize the remaining fuel level as in the past. It has been submitted.

That is, as shown in FIG. 5, an injection pipe 103 is connected to an injection port 102 provided on one side of the fuel tank 110 and on either the left or right side channel 101 of the vehicle body. An outside air communication pipe 104 is connected to one side of the upper wall 111 of the fuel tank 110 and the injection port 102 in parallel.

The lower wall 112 of such a fuel tank 110 does not have a recess like the conventional one, but a recess 115 is formed transversely in the front-rear direction at approximately the left and right center of the upper wall 111. This recess 1
Vehicle body constituent members such as a vehicle body frame, or installation members such as operating members for a propulsion shaft and a rear wheel steering system are disposed within the vehicle body frame 15.

Since the recess 115 for arranging the necessary installation members is formed in the upper part of the fuel tank 110, there is no recess in the lower part as in the conventional case. There is no need to apply.

By the way, as described above, the upper wall 111 of the fuel tank 110
By forming the recess 115 in the fuel tank 110, the upper part of the fuel tank 110 is divided into left and right chambers 121 and 131 by the reverse plate part 116 forming the recess 115.

However, one of the chambers 121 has the above-mentioned through-out air communication pipe 1.
04 is attached to the tank, but unless there is one in the other chamber 131, when fuel is injected from the inlet 102 as shown in FIG. As a result, the lower end of the inverted plate portion 116 is first filled. If the injection is continued further, only one chamber 121 equipped with the outside air communication pipe 104 will be filled with fuel, and air will be trapped in the other chamber 131 where the outside air communication pipe is not installed. Since there is no source for the trapped air, it is not possible to fill this volume with fuel.

In order to solve this problem, it is necessary to communicate the two chambers 12L and 1319, and it is conceivable to construct a communication pipe above the recess 115 with this in mind. Therefore, constructing a communication pipe outside the fuel tank 110 in this way is not only difficult in terms of space, but also difficult and complicated in terms of assembly, and the connection between the communication pipe and the compartments 121 and 131. Problems such as concerns regarding the durability of each connection portion arise.

Therefore, the reality is that if possible, it is desirable not to construct a communicating pipe externally.

Therefore, an internal communication pipe (hereinafter referred to as a U-shaped pipe) 140 having a U-shaped front view as shown in FIG.
Both ends 141 and 142 of the U-shaped tube 1400 are connected to the upper chamber 1, respectively.
21. The corresponding 0 is placed in the tank 110 facing the upper part of 131.
It is conceivable to arrange a double tube 140.

However, in reality, the liquid level of the fuel in the tank 110 fluctuates up and down due to vibrations and rocking of the fuel tank 110 while the vehicle is running etc. Fuel gradually enters the pipe 140 and blocks the pipe line, so that it no longer functions as a communicating pipe.

If fuel is injected in such a state, the fuel will only fill up to the upper wall 111 of one of the upper chambers 121 equipped with an outside air communication pipe as described above, and the inside of the other upper chamber 131 without an outside air communication pipe will be filled with fuel. This results in air being trapped.

The present invention has been made in order to solve the above-mentioned disadvantages, and its object is to provide a fuel tank having a recess formed transversely in the upper part for arranging necessary installation members of a vehicle.
The fuel that has entered into the internal communication pipe that communicates the upper chamber divided into four parts is drained into the tank, and while air is smoothly vented from the upper chamber where there is no outside air communication pipe, the upper chamber is also filled with fuel. Therefore, it is an object of the present invention to provide a fuel tank for an automobile, which can be filled with fuel by fully utilizing the internal volume of the tank.

In order to achieve such an object, the present invention has a recess formed transversely in the upper part for arranging necessary installation members of the vehicle.
In a fuel tank in which a fuel injection pipe and an outside air communication pipe are arranged side by side and connected to one of the upper chambers in the tank divided by the recess, the internal communication pipe is placed along the recess so as to straddle the recess from below. Both ends of the communication pipe are opened above each upper chamber, and the internal communication pipe is installed in the tank, and a one-way float valve is attached hanging from the lowest part of the internal communication pipe to connect the internal communication pipe. The gist is that the fuel that has entered the pipe is drained into the tank, and the fuel in the tank is prevented from flowing back into the internal communication pipe to ensure the function of the communication pipe.

A preferred embodiment of the present invention will be described in detail below with reference to FIGS. 1-4. FIG. 1 is a longitudinal front (back) view of a fuel tank according to the present invention, and FIG. 2 is a longitudinal front (rear) view showing an enlarged internal communication pipe and float valve portion.

Although not shown, the fuel tank 10 is disposed at the rear of the vehicle body, below the floor panel, as is known, and is attached to the vehicle body frame.
It is equipped with a mound.

The fuel tank 10 is extended with a sufficient width in the width direction of the vehicle body in order to increase the internal capacity, and is provided near one side of the fuel tank 10 and on the side panel 1 on either the left or right side of the vehicle body. An injection pipe 3 is connected to the injection port 2, and an outside air communication pipe 4 is connected to the injection port 2 and to one side of the upper wall 11 of the fuel tank 10 in parallel with the injection pipe 3.

The lower wall 12 of the fuel tank 10 is not formed with a conventional recess, but a recess 15 is formed transversely in the front-rear direction at approximately the left and right center of the upper wall 11.

In the present invention, an internal communication pipe 40 is provided in the tank 10 that communicates the upper chambers 21 and 31 divided into left and right sides by the recess 15, and a one-way connection is provided at the lowest part of the internal communication pipe 40. A float valve 50 was attached hanging down.

In other words, an internal communication pipe that forms a U-shape from the front (hereinafter referred to as a U-shaped pipe)
40 along the inverse plate part 16 forming the recessed part 15 from below, and both ends 41.4 of the U-shaped tube 40.
2 above the upper chambers 21 and 31, respectively, and the tank 10
The U-shaped tube 40 is disposed inside. In this case, the U-shaped tube 40
The lowest part 43, which is cut at the center in the length direction, remains very close to the bottom of the reverse plate part 16, and the stay 6L 62 has both ends 41, 42 fixed to both side walls of the husband reverse plate part 16. The U-shaped tube 40 is thus disposed around the reverse plate portion 16.

Further, a drain port 44 is opened downward in the lowest part 43 of the U-shaped tube 40, and a small-capacity drain chamber 45 is formed hanging from the drain port 44.
A valve hole 51 is formed in the lower wall of.

A valve chamber 52 is further formed hanging below the drain chamber 45 including the pulp hole 51, and a through hole 53 is formed in the peripheral side wall of the valve chamber 52, and a through hole 54 is also formed in the lower wall. are formed respectively, and a float ball 55 is accommodated in the valve chamber 52. This float ball 55 is accommodated so as to be able to float up and down within the valve chamber 52, and its diameter is much larger than the diameter of the pulp hole 51.

Thus, a one-way float valve 50 is suspended from the lowest part 43 of the U-shaped pipe 40.The inverted plate part 1 forming the recess 15 formed in the upper part of the fuel tank 10
A U-shaped tube 40 is arranged in the tank around 6, and a float 50 is formed hanging from the lowest part 43 of the U-shaped tube 40. As the fuel is poured in, the liquid level rises and the float ball 55 that constitutes the float valve 50 floats up inside the valve chamber 52 until it closes the valve hole 51.
A conduit inside the U-shaped pipe 40 is a drain port 44 and a drain chamber 4.
5. Because the pallet 7' hole 51 and the through hole 53 on the peripheral side wall of the valve chamber 52 communicate with each other, the liquid level fluctuates up and down in the tank during fuel injection, resulting in droplets forming a U-shape. tube 4
Even if fuel gets into the tank, it can be drained into the tank.

Therefore, fuel does not accumulate in the U-shaped pipe 40 that communicates the divided upper chambers 21.31 with each other, and the communication function is sufficiently ensured. The air in the upper chamber 31 of the room 30 at the back of the recess 15 is discharged through the U-shaped tube 40 without any hindrance into the upper chamber 21 of the room 20 at the front, and is thus smoothly discharged. The rain upper chamber 21.31 is reliably filled with fuel while removing air. In this case, even if droplets enter the U-shaped pipe 40 before the fuel reaches full capacity, the drain chamber 45 is interposed above the float valve 50 as in the embodiment, It can be seen that the pipeline is secured.

On the other hand, after the vehicle is fully loaded with fuel, as the vehicle runs, fuel enters the U-shaped tube 40 due to the lifting and shaking of the liquid level. The fuel accumulates and forces the pipe to close, but as the fuel continues to travel, the fuel is consumed, and when the liquid level drops to 9, the float ball 55 separates from the valve hole 51 and descends into the pipe and drain chamber 45. The fuel is in the valve hole 51 and the pulp chamber 5.
It is discharged into the tank 10 through the through holes 53 in the two circumferential side walls.

Therefore, the state returns to the state where the conduit in the U-shaped tube 40 is secured again, and if fuel is replenished from this state, the inner upper chamber 31 is also filled with fuel in the same manner as described above.

The through hole 54 formed in the lower wall of the valve chamber 52 is for starting the floating behavior of the float ball 55.

By the way, in the embodiment, the drain chamber 45 is interposed between the lowest part 43 of the U-shaped pipe 40 and the float valve 50 that is formed to hang down from this, but it is not necessarily necessary to provide the drain chamber 45, and such a drain If the chamber 45 is provided, its capacity should be determined with a certain amount of allowance in mind.Furthermore, the float valve 50 is not limited to the structure of the embodiment, and may have any structure to achieve the intended purpose. Of course, this can be achieved.

As is clear from the above description, according to the present invention, in a fuel tank in which a recessed portion for arranging necessary installation members of a vehicle is formed transversely in the upper portion, the upper chambers divided by the recessed portions are communicated with each other. An internal communication pipe is disposed so as to straddle the circumference of the recess from below, and furthermore, at the lowest part of the internal communication pipe,
A hanging float valve is attached to drain the fuel that has entered the internal communication pipe into the tank and prevent the backflow of fuel from the inside of the tank to the pipe, making it possible to smoothly vent air from the upper chamber where the outside air communication pipe is not attached. The upper chamber can also be filled with fuel while the fuel is being carried out, so that the internal volume of the tank can be fully utilized to fill the fuel.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, and FIG. 1 is a cross-sectional (rear) view of a fuel tank according to the present invention.
Fig. 2 is a longitudinal front (rear) view showing an enlarged view of the internal communication pipe and the float valve, Figs. 3 and 4 are explanatory views of each operation showing the fuel filling process, and Figs. 5 to 7. 5 shows the fuel tank which is the front part of the present invention, FIG. 5 is a vertical front (rear) view showing its basic configuration, FIG. 6 is an explanatory view of the same operation, and FIG. 7 shows only the internal communication pipe. FIG. 8 is a vertical front (rear) view showing a conventional fuel tank, which is arranged and cut into only essential parts, and also explains the function.

Claims (1)

[Claims] A fuel tank disposed below the floor/main panel of an automobile, which is a recess for arranging body components such as the body frame, or installation members such as propulsion shafts and operating members of the rear wheel steering system. In a fuel tank in which a fuel injection pipe and an outside air communication pipe are arranged side by side in one of the upper chambers of the tank divided by the recesses, the upper chamber is divided by the recesses. An internal communication pipe with each end opened above the upper chamber of the tank is arranged in the tank so as to straddle the recess from below, and the lowest part of the internal communication pipe is connected to the 1. A fuel tank for an automobile, characterized in that a float pulp is attached hanging down to drain fuel that has entered an internal communication pipe into the tank and prevent the fuel in the tank from flowing back into the internal communication pipe.