JPH08500B2 - Automotive fuel tank vapor discharge device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automotive fuel tank, and more particularly to a vapor discharge device for a fuel tank made of a resin material.

2. Description of the Related Art In a fuel tank for automobiles, it is generated in the vapor discharge tube so that the internal pressure of the tank rises due to the generation of vapor, which hinders the fuel supply and the tank body is not deformed. The vapor is taken out of the tank main body and guided to the canister, and the canister is supplied to the intake passage of the engine together with the purge air for processing. This will be described with reference to FIG. 4. Reference numeral 11 denotes a blow-molded tank main body having a resin material, and a bulging portion 12 is formed on one side thereof. On the upper wall of the bulging portion 12, a recess 13 is bulged toward the inside of the bulging portion 12. Communication holes 14a and 14b are formed in the bottom wall and the peripheral wall of the recess 13 and the recess 1 is formed.
The opening of 3 is closed by a lid 16 integrally formed with a vapor pipe 17 to form a separator chamber 15. According to this conventional apparatus, the vapor generated in the upper space S of the tank body 11 flows into the separator chamber 15 through the communication holes 14a and 14b, and the vapor flowing into the separator chamber 15 is connected to the vapor pipe 17 and the vapor pipe 17. Then, it is removed from the tank main body through a vapor lead-out tube 18 which communicates with a canister (not shown) and is processed. In addition, the fuel sways due to sudden vehicle start, sudden braking, cornering, etc., and the communication holes 14a,
Even if the fuel flows into the separator chamber 15 from 14b (the diameters of the communication holes 14a and 14b are relatively small, and the fuel inflow amount is regulated to some extent by the orifice effect), the communication hole 14a is restored if the vehicle posture returns to the normal state. As a result, the fuel that has flowed into the separator chamber 15 is returned to the inside of the tank body 11, and the fuel is prevented from flowing out of the tank body. This similar structure is shown, for example, in Japanese Utility Model Publication No. 59-57218.

Problems to be Solved by the Invention When the vehicle is parked on a slope and the upper space S in the tank body 1
When a long time elapses in a state of being divided into two as shown by the chain line in FIG. 4, the upper space S is sealed on the side opposite to the side where the bulging portion 12 of the tank body 11 is formed. Is not discharged, the desired effect is not obtained, and when refueling is performed in this state, refueling is performed in the upper space S on the side opposite to the side on which the bulging portion 12 is formed. However, there is a problem that the effective capacity of the tank is substantially narrowed.

Therefore, the present invention smoothly discharges the generated vapor even when the upper space in the tank body is divided into a bulging portion forming the separator chamber and a portion opposite to the bulging portion forming side. A vapor discharge device for a vehicle fuel tank is provided.

Means for Solving the Problems A bulge is formed on one upper side of the upper wall of the tank body made of a resin material, and a recess is formed substantially horizontally from the rising wall of the bulge into the bulge. Bulging molding is performed, a communication hole is provided on the upper wall of the recess, and the opening of the recess is closed with a lid to form a separator chamber. On the other hand, a lead-out vapor pipe for leading out the vapor in the separator chamber to the outside is provided in the lid. In addition to being connected for communication, the position of the lid corresponding to the bottom of the separator chamber and the upper space in the tank body opposite to the side where the bulging portion is formed are communicated via the outside of the tank body to generate the upper space. An introduction-side vapor pipe for introducing the vapor into the separator chamber was connected.

Action When the tank body is in a horizontal state parallel to the liquid level in the tank and there is a space in the upper part of the tank body, the vapor generated in this upper space is the communication hole of the separator chamber and the introduction side vapor pipe. To the outside of the tank body via the outlet side vapor pipe.

When the vehicle is parked on a sloping ground and the upper space in the tank body is divided into the bulging portion side and the side opposite to the bulging portion forming side, the vapor generating upper space on the bulging portion side is a communication hole. Further, while flowing into the separator chamber, the vapor generated in the upper space on the side opposite to the bulging portion forming side flows into the separator chamber through the introducing vapor pipe, and is discharged from the separator chamber to the outside of the tank main body via the outlet vapor pipe. It

Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3, reference numeral 1 denotes a blow-molded tank body having a resin material, and a bulging portion 2 is formed on the upper wall of the tank body 1. In the bulging portion 2, a recess 3 is bulged substantially horizontally from the rising wall of the bulging portion 2 toward the bulging portion 2. A communication hole 4 is formed in the upper wall of the recess 3 and the opening of the recess 3 is provided with a lid 6.
To form the separator chamber 5. The lid 6 is integrally formed with a lead-out vapor pipe 7 that communicates with the upper portion of the separator chamber 5 and leads the vapor in the separator chamber 5 to the outside, specifically to a canister (not shown).
Further, at the bottom of the lid 6, the bottom of the separator chamber 5 and the upper space S on the opposite side of the tank body 1 from the side where the bulging portion 2 is formed are communicated with each other via the outside of the tank body 1, An introduction side vapor pipe 8 for introducing the generated vapor in the upper space S into the separator chamber 5 is integrally formed. The tank body 1
Recesses on the vapor pipe and the lid
9 and 10 are formed to receive the vapor pipes 8 and 7 and the lid 6 on the inlet side and the outlet side in the recesses 9 and 10,
The vapor pipes 8 and 7 can be protected.

According to the apparatus of the above-described embodiment, when the tank body 1 is in the horizontal state parallel to the liquid level in the tank and a space is entirely formed in the upper portion of the tank body 1, the space is generated in the upper space S. The vapor thus made flows into the separator chamber 5 through the communication hole 4 of the separator chamber 5 and the introduction-side vapor pipe 8, and is drawn out of the tank body 1 via the discharge-side vapor pipe 7.

The vehicle is parked on a slope and the upper space S in the tank body 1
Shows the bulging portion 2 side and the bulging portion 2 as shown by the chain line in FIG.
When divided into the forming side and the opposite side, the vapor generated in the upper space S on the bulging portion 2 side flows into the separator chamber 5 through the communication hole 4 of the separator chamber 5, while the bulging portion 2 forming side is formed. The generated vapor in the upper space S on the opposite side flows into the separator chamber 5 through the introduction-side vapor pipe 8, and even in this case, the generated vapor is smoothly removed from the tank body 1 without staying in the tank body 1. It is possible to refuel smoothly. Even if the fuel in the tank moves due to the sudden start, sudden braking, or cornering of the vehicle and the fuel flows into the separator chamber 5 through the communication hole 4 and the introduction-side vapor pipe 8, the introduction-side vapor pipe will return if the vehicle returns to its normal state. The fuel flowing into the separator chamber 5 from 8 is returned to the tank body 1.

Here, in particular, since the introduction-side vapor pipe 8 communicates with the bottom of the separator chamber 5 outside the tank main body 1 and the upper space on the side opposite to the bulge forming side of the tank main body 1, the tank main body 1 is made of a resin material. Even if blow molding is performed integrally, the introduction-side vapor pipe 8 can be easily piped.
Further, the outlet side vapor pipe 7 is also connected to the inlet side vapor pipe 8.
Since it does not have to be integrally formed with the lid 6 and placed in the tank body 1, the overall piping work can be reduced. Further, by arranging the lid 6, the lead-out vapor pipe 7 and the lead-in vapor pipe 8 in the recesses 10 and 9 as in this embodiment, each vapor pipe interferes with other vehicle-mounted parts and is damaged. There is an advantage that the tank main body 1 can be mounted on the vehicle by the belt clamp means.

EFFECTS OF THE INVENTION As described above, according to the present invention, the upper space in the tank body made of the resin material is divided into the bulging portion side on one side and the side opposite to the bulging portion forming side. Even in such a case, the vapor generated in the upper space on the side opposite to the side where the bulging portion is formed can be smoothly drawn out of the tank main body through the separator chamber and the outlet vapor pipe by the introduction vapor pipe. The intended purpose can be achieved. And
In particular, the outlet side vapor pipe is arranged outside the tank body, and both the outlet side vapor pipe and the inlet side vapor pipe can be attached to the lid that closes the concave portion and can be piped without penetrating the inside of the tank body. Even if it is integrally blow-molded together with the recess for forming the separator chamber, the piping work can be easily performed, and it has a great practical effect that it can greatly contribute to cost reduction.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a separator chamber portion, FIG. 3 is an external perspective view of the same, and FIG. 4 is a sectional explanatory view showing a conventional device. is there. 1 ... Tank body, 2 ... Bulging portion, 3 ... Recessed portion, 4 ...
Communication hole, 5 ... Separator chamber, 6 ... Lid, 7 ... Outgoing vapor pipe, 8 ... Introducing vapor pipe, S ...
Upper space.

Claims (1)

[Claims] 1. A bulging portion is formed on one side upper part of an upper wall of a tank body made of a resin material, and a recess is bulged substantially horizontally from a rising wall of the bulging portion toward the inside of the bulging portion. ,
A communication hole is provided on the upper wall of the recess, and the opening of the recess is closed by a lid to form a separator chamber, while a lead-out vapor pipe for leading out the vapor in the separator chamber to the outside is connected to the lid. A position corresponding to the bottom of the separator chamber of the lid and an upper space on the opposite side of the bulging portion forming side in the tank main body communicate with each other via the outside of the tank main body, and a vapor generated in the upper space is connected to the separator chamber. A vapor discharge device for a fuel tank for an automobile, characterized in that a vapor pipe for introduction is connected.