JPH0428566B2 - - Google Patents

Description

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

The fuel tank of an automobile is located at the rear of the vehicle body and below the floor panel. Conventionally, as shown in FIG. A recess 317 is formed, and in the recess 317, 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 inside the fuel tank 310 is a recess 317.
The left and right reservoirs 322,
It will be divided into 332 parts.

In addition, the side panel 301 on either the left or right side of the vehicle body
An injection port 302 is provided in the fuel tank 310, and an injection pipe 303 is provided on one side of the injection port 302 and the fuel tank 310.
is connected to the injection pipe 303, and the injection port 3 is connected to the injection pipe 303.
An outside air communication pipe 304 is connected to the upper wall 311 of the fuel tank 310 and the fuel tank 310 .

By the way, the embankment 318 forming the recess 317
Therefore, the lower part of the fuel tank 310 is divided into left and right reservoirs 3.
Since the fuel is divided into 22 and 332 parts, if the remaining fuel level becomes lower than the bank part 318, the fuel supply pipe to the engine (not shown) is connected to one of the reservoir parts. Respective reservoirs 322, 332
The remaining capacity level will be different.

Therefore, in the past, both reservoirs 322, 3
In order to make the remaining amount level of 32 uniform, the communication pipe 31
9 had to be constructed below the recess 317.

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. Patent application for a fuel tank for an automobile, which is characterized by being disposed 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. has been submitted.

That is, as shown in FIG. 3, an injection pipe 203 is connected to an injection port 202 provided on one side of the fuel tank 210 and on either the left or right side panel 201 of the vehicle body.
is connected to one side of the upper wall 211 of the fuel tank 210 and in parallel with the injection pipe 203.
2 is connected to an outside air communication pipe 204.

The lower wall 212 of such a fuel tank 210 does not have a concave portion as in the conventional case, but a concave portion 215 is formed transversely in the front-rear direction at approximately the left-right center of the upper wall 211. In this recess 215, vehicle body constituent members such as the vehicle body frame, or installation members such as operating members for the propulsion shaft and rear wheel steering system are arranged.

A recess 21 for arranging necessary arrangement members.
5 is formed in the upper part of the fuel tank 210, there is no recess in the lower part as in the conventional case, and therefore there is no need to take measures to equalize the level of remaining fuel.

By the way, if the recess 215 is formed in the upper wall 211 of the fuel tank 210 as described above, the recess 21
The fuel tank 21 is
The upper part of 0 is divided into left and right chambers 221 and 231.

However, although the outside air communication pipe 204 is attached to one chamber 221 as described above, the other chamber 23
1 does not have this, so when fuel is injected from the injection port 202 as shown in FIG. It is filled.
If the injection is continued further, only one chamber 221 equipped with the outside air communication pipe 204 will be filled with fuel, and air will be trapped in the other chamber 231 where the outside air communication pipe is not installed. Since there is no source of air, it is not possible to fill this volume with fuel.

To solve this problem, both chambers 221 and 23
It is necessary to connect the recess 2 with the recess 2 in mind.
It is conceivable to install a communication pipe above the fuel tank 210, but since the above-mentioned necessary installation members are provided in the recess 215, installing the communication pipe outside the fuel tank 210 in this way does not take up much space. In addition to the above difficulties, other problems arise, such as assembly difficulties and complications, and concerns about the durability of the respective connection parts between the communication pipe and both chambers 221 and 231.

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

The present invention has been made in view of the above circumstances.
The purpose of this is to vent air from the upper chamber divided by the recess, which does not have an outside air communication pipe, in a fuel tank that has a recess crosswise formed in the upper part for installing necessary parts of the vehicle body. The upper chamber is also filled with fuel in a smooth manner, so that the internal volume of the tank is fully utilized to fill the fuel,
Moreover, it is an object of the present invention to provide a fuel tank for an automobile that achieves the above without attaching a communication pipe to the outside of the tank.

In order to solve the above problems and achieve the object, the present invention is a fuel tank disposed below the floor panel of an automobile, which is connected to a vehicle body component such as a vehicle body frame, or a propulsion shaft and a rear wheel steering system. A recess is formed transversely in the upper part for arranging installation members such as operating members, and a fuel injection pipe and an outside air communication pipe are arranged side by side in one of the upper chambers in the tank divided by the recess. In the fuel tank connected to the fuel tank, an internal pipe connected to the fuel injection pipe is installed horizontally inside the tank, and the tip of the internal pipe is extended below the other upper chamber divided by the recess, and A separator is formed hanging into the tank from the lower part of the recess to define two chambers within the tank, and the separator has a throttle passage that connects both chambers downward with a flow path area smaller than the internal pipe. furthermore, one end of the ventilation pipe faces the ceiling of the upper room where the outside air communication pipe is not attached, and the other end of the ventilation pipe passes through the separator and faces the other room. shall be.

Embodiments of the present invention will be described below based on FIGS. 1 and 2.

The fuel tank 110 is disposed in the rear part of the vehicle body (not shown), below the floor panel, as is known, and is mounted on the vehicle body frame.

The fuel tank 110 extends to a sufficient width in the width direction of the vehicle body in order to increase its internal capacity. An injection pipe 103 is connected to an injection port 102 provided in the injection port 102 . Also, a fuel tank 110 is installed in parallel with the injection pipe 103.
On one side of the upper wall 111 and on the injection port 102,
An outside air communication pipe 104 is connected.

The lower wall 112 of such a fuel tank 110 is not formed with a concave portion as in the conventional case, but a concave portion 115 is formed approximately in the left and right center of the upper wall 111 in the front-rear direction.
are formed cross-sectionally.

In the present invention, the internal pipe 140 is extended into the fuel tank 110, and the separator 141
so as to define left and right rooms 120 and 130,
Furthermore, a ventilation pipe 143 was connected to the upper part of the upper room 131 of the back room 130 and the front room 120.

That is, the separator 141 hangs down from the reverse embankment 116 forming the recess 115, a passage 142 is formed between the lower part of the separator 141 and the lower wall 112, and the interior of the fuel tank 110 is divided into left and right chambers 120 and 130 by the separator 141. are doing.

Then, one end of the internal pipe 140 is connected to the injection pipe 103, and the internal pipe 140 is installed laterally in the lower part of the fuel tank 110, and the other end is connected to the separator 141.
The lower part of the opening is penetrated into the inner room 130.

Reverse embankment part 1 of the upper chamber 131 of the further back chamber 130
One end of the ventilation pipe 143 is opened and exposed to the ceiling near the separator 16, and the other end of the ventilation pipe 143 is connected to the ceiling near the separator 1.
It penetrates through the upper part of 41 and opens into the room 120 in front.

The inside of the fuel tank 110 is divided into left and right chambers 120 and 130 by the separator 141 with the concave portion 115 as a boundary, except for the lower part near the lower wall 112, and an internal pipe 1 connected to the injection pipe 103 is defined.
40 through the separator 141 to the back room 13
0, and then the upper room 1 of the inner room 130.
31 and the front room 120 are communicated with each other by the ventilation pipe 143 that passes through the separator 141. Therefore, the fuel injected from the injection port 102 passes through the injection pipe 103 and the internal pipe 140, and first flows into the back room 130. At this time, fuel also flows into the room 120 in front according to the area of the passage 142 formed below the separator 141.

The fuel flowing into the inner chamber 130 is first filled into the chamber 130 with a certain flow force due to the inflow velocity and the water head difference, while the separator 14
1, the area of the passage 142 below the passage 142 is smaller than the flow passage area of the inner tube 140 and has been constricted in advance.
The flow rate of the fuel flowing into the front room 120 through 2 is restricted, so that the fuel is first filled into the back room 130.

In this way, the air in the inner chamber 130 corresponding to the amount of fuel that is first filled into the inner chamber 130 is passed through the ventilation pipe 14 which has one end opened in the ceiling of the upper chamber 131.
3, the air is discharged into the front room 120, and while air is smoothly vented in this way, it is discharged into the back room 130.
The upper chamber 131 is filled with fuel.
First, the fuel is reliably filled up to the inside. Thereafter, the fuel flowing into the back room 130 flows through the passage 142 into the front room 120 with increasing force, filling the upper wall 111 with fuel and completing the injection.
At this time, of course, the upper room 121 of the room 120 in the foreground
The air inside is discharged to the outside of the tank through the outside air communication pipe 104, and the tank 110 is reliably filled with fuel.

That is, the separator 141 and the passage 142 control the fuel flow rate from the back room 130 to the front room 120, and the liquid level up to the upper wall 111 of the back room 130 and the liquid level in the front room 120 are adjusted. It can be seen that consideration has been given to ensuring the difference ΔH and at the same time eliminating the resistance caused by the rise in the fuel level when the air discharged from the inner upper chamber 131 is moved by the ventilation pipe 143.

In this way, fuel can be filled into the volume of the upper chamber 131 at the back where no outside air communication pipe is attached, and the tank can be filled with fuel by fully utilizing the volume inside the tank.

In the embodiment, the lower part of the separator 141 and the lower wall 1
A passage 142 was formed between the separators 1 and 1.
41 hangs down to the lower wall 112 and the separator 14
Of course, the passage 142 may be formed in the first part.

As is clear from the above description, according to the present invention,
In a fuel tank that has a recess formed transversely in the upper part for arranging the necessary parts of the vehicle body, the upper chamber, which is divided by the recess and which does not have an outside air communication pipe, can be smoothly vented. Since the inside of the tank has a structure that allows fuel to be filled indoors, it is possible to fully utilize the internal volume of the tank to fill it with fuel without having to attach a communication pipe to the outside of the tank.

[Brief explanation of drawings]

Fig. 1 is a longitudinal front (rear) view of a fuel tank according to the present invention, Fig. 2 is an explanatory view of the same operation, and Fig. 3 is a longitudinal front (rear) view showing the fuel tank that is the premise of the present invention.
FIG. 4 is a top view, FIG. 4 is an explanatory view of the same operation, and FIG. 5 is a vertical sectional front (rear) view showing a conventional fuel tank. In the drawing, 103 is a fuel injection pipe, 104 is an outside air communication pipe, 110 is a fuel tank, 111 is its upper wall, 115 is a recess, 120 and 130 are rooms, and 12
1,131 is an upper chamber, 140 is an internal pipe, 141 is a separator, 142 is a throttle passage, and 143 is a ventilation pipe.

Claims (1)

[Scope of Claims] 1. A fuel tank disposed below the floor panel of a motor vehicle, which is a fuel tank disposed below the floor panel of an automobile, and which is used for the arrangement of vehicle body structural members such as a vehicle body frame, or disposed members such as propulsion shafts and operating members of a rear wheel steering system. In a fuel tank, 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, and the tank has a recess formed transversely in the upper part for An internal pipe connected to the fuel injection pipe is horizontally installed in the tank, and the tip of the internal pipe is extended below the other upper chamber divided by the recess, and a separator is inserted into the tank from the bottom of the recess. The inside of the tank is defined into two rooms by forming a hanging part,
In addition, a throttle passage is formed in the separator to communicate the two chambers downwardly with a flow path area smaller than that of the internal pipe, and one end of the ventilation pipe is connected to the ceiling of the upper chamber where the outside air communication pipe is not attached. A fuel tank for an automobile, characterized in that the other end of the vent pipe passes through the separator and faces the other chamber.