JPH0958280A - Fuel tank - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent intrusion of water or sand which causes corrosion from the inside of a lid which closes an opening of a tank body,
It is to provide a durable fuel tank with high rust prevention effect. An annular seal packing (21) is provided around an opening (3) provided on a wall surface (2) of a tank body (1), and a disc-shaped lid (25) that closes the opening (3) via the seal packing (21). In this fuel tank, the lid 25 has a bent edge portion 27 that is formed by bending the outer periphery of the central portion formed flat to the seal packing side, and the seal packing 21 includes the lid 25. An annular thick portion 22 interposed between the central portion of the fuel tank 1 and the outer peripheral edge of the opening 3 of the tank body 1, and a wall surface 3 of the fuel tank formed on the outer peripheral edge of the annular thick portion 22.
And an annular thin portion 23 that is in close contact with the annular thin portion 23 of the lid 25, and a portion of the flat portion 26 of the lid 25 is closely adhered to the annular thick portion 22 of the seal packing 21.
Is characterized by contact with.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fuel tank for an automobile.

[0002]

2. Description of the Related Art As shown in FIGS. 5 to 7, a fuel tank containing gasoline or the like is provided with an opening 3 on a wall surface 2 of a tank body 1 made of metal plated with lead and tin. The opening 3 is closed by a lid 4 which is disc-shaped and is galvanized. A fuel pump 5 and a gauge assembly 6 are mounted on the lid body 4, and a fuel pipe 7 and a return pipe 8 are provided so as to penetrate therethrough.

From the opening 3 to the fuel pump 5
By inserting the gauge assembly 6 into the tank body 1 and closing the opening 3 with the lid 4, the fuel pump 5 and the gauge assembly 6 can be mounted, and at the same time, the fuel pipe 7 and the return pipe 8 are connected. It has become so.

By the way, the wall 2 and the lid 4 of the tank body 1
It is necessary to keep air-tightness between the tank and
A bracket 10 is spot-welded to the wall surface 2 of the tank body 1 located on the outer periphery of the protruding bank 9. And
Heads 11a of a plurality of bolts 11 are fixed between the wall surface 2 and the bracket 10, and screw portions 11b of the bolts 11 are projected upward.

An annular seal packing 12 is provided on the upper surface of the bracket 10, and the lid 4 is provided through the seal packing 12. Therefore, the seal packing 12 and the lid 4 are provided with a plurality of bolt holes 12a and 4a through which the bolt 11 penetrates.
The nut 13 is screwed into the threaded portion 11 b of the above, and the lid 4 is fixed to the tank body 1 through the seal packing 12 by tightening the nut 13. A reference numeral 14 is a positioning pin projecting from the seal packing 12 and is inserted into the positioning hole 15 of the lid 4.

Further, the lid 4 is formed to have a diameter larger than the outer diameter of the seal packing 12, and the outer peripheral edge of the lid 4 projects outward from the seal packing 12, and the projecting portion 16 is slanted downward. It has been folded.

[0007]

However, the conventional fuel tank constructed as described above has a structure in which the seal packing 12 is not in contact with the inner end of the lid 4, that is, the inside of the protrusion 16. In the area where corrosion is severe due to invasion of water or sand, rust progresses from the inside of the lid body 4, and depending on the corrosion situation, rust may occur at the contact portion between the seal packing 12 and the inside of the lid body 4. .

The present invention has been made in view of the above circumstances, and its purpose is to prevent intrusion of water or sand, which causes corrosion, from the inside of the lid that closes the opening.
It is to provide a fuel tank having a high rust prevention effect.

[0009]

In order to achieve the above-mentioned object, the present invention provides a tank main body and an annular ring arranged around an opening provided in a wall surface of the tank main body. In a fuel tank comprising a seal packing, a disk-shaped lid that closes the opening through the seal packing, and a tightening member that fixes the lid to the tank body, the lid is flat. There is a bent edge portion that is formed by bending the outer periphery of the formed central portion toward the seal packing side over the entire circumference, and the seal packing is the outer peripheral edge of the central portion of the lid and the opening of the tank body. An annular thick portion interposed between the annular thick portion and an annular thin portion that is formed on an outer peripheral edge of the annular thick portion and is in close contact with the wall surface of the fuel tank. Part closely adheres to the annular thick part of the seal packing, and The Kyokuen portion, characterized in that in contact with the annular thin portion of the seal packing.

Corrosion is caused by the double seal structure in which the flat portion of the lid and the thick portion of the seal packing are in close contact with each other and the bent edge portion of the lid and the annular thin portion of the seal packing are in contact with each other. This is to prevent the entry of water and sand.

According to a second aspect of the present invention, the bent edge portion of the lid body is formed in an arc shape at an end portion in contact with the seal packing. According to a third aspect of the present invention, the tightening member includes a bolt and a nut, and a head of the bolt is fixed to the tank body by a bracket.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show the first embodiment, and an annular seal packing 21 is placed on the upper surface of the bracket 10 fixed to the tank body 1.
This seal packing 21 is made of a rubber material and has an opening 3
The inner peripheral side located on the side is formed into an annular thick portion 22, and the outer peripheral edge of the annular thick portion 22 is formed into an annular thin portion 23. The annular thin portion 23 is thinly formed by forming a step on the upper surface of the seal packing 21, the thickness thereof is about ½ of the annular thick portion 22, and the width thereof is substantially the same as that of the annular thick portion 22. It is formed to about 1/2.

The lower surface of the seal packing 21 is formed into a flat surface so as to come into close contact with the upper surface of the bracket 10. Furthermore, the annular thick portion 2 of the seal packing 21
A plurality of bolt holes 24 through which the bolt 11 penetrates are formed in the hole 2.

The lid 25 that closes the opening 3 of the tank body 1 is disk-shaped, and a flat edge 26 is provided with a bent edge portion 27 that is bent obliquely downward. . Further, the end portion of the bent edge portion 27 is formed into an arc shape by R processing. A plurality of bolt holes (not shown) corresponding to the bolt holes 24 of the seal packing 21 are formed on the outer peripheral portion of the flat portion 26 of the lid 25. The positioning pin 14 of the seal packing 21 is the lid 2
5 is inserted into the positioning hole 15 and temporarily fixed to the inside of the lid 25, a part of the flat portion 26 of the lid 25 is in close contact with the annular thick portion 22 of the seal packing 21, and the bent edge portion 27 is annular. It is in contact with the thin portion 23.

Therefore, when the opening 3 of the tank body 1 is closed, the bolt hole of the lid 25 and the bolt hole 24 of the seal packing 21 are fitted to the bolt 11, and the bolt 1
The screw part 11 b of No. 1 is projected from the upper surface of the lid 25. Then, the nut 13 is screwed into the threaded portion 11b, and the nut 13
Is tightened with a tool, the lid 25 is fixed to the bracket 10 via the seal packing 21, and the opening 3 is closed by the lid 25.

In this case, a part of the flat portion 26 of the lid 25 is in close contact with the annular thick portion 22 of the seal packing 21, and the bent edge portion 27 on the outer periphery is in contact with the annular thin portion 23 of the seal packing 21. The bent edge portion 27 bites into the annular thin portion 23 and is doubly sealed so that water and sand do not enter from the outer peripheral edge portion of the lid body 25, and rust can be prevented from occurring. . Further, since the end portion of the bent edge portion 27 is formed into an arc shape by the R processing, the surface of the seal packing is not damaged.

FIG. 4 shows a second embodiment in which the bracket 10 is eliminated and the bolt 11 is directly fixed to the tank body 1. That is, the wall surface 2 of the tank body 1
A bolt hole (not shown) is provided in the bolt hole, the bolt 11 is inserted into the bolt hole from the inside of the tank body 1, and the head 11a of the bolt 11 is welded to the wall surface 2. The seal packing 21 and the lid 25 are The same effect can be obtained by configuring the same as the first embodiment.

[0018]

As described above, according to the first aspect of the present invention, water or sand that causes corrosion is prevented from entering from the inside of the lid that closes the opening of the tank body by the double seal structure. It is possible to provide a durable fuel tank that can be prevented and has a high rust preventive effect.

According to the second aspect, the seal packing is not damaged by the bent edge portion of the lid, and the durability is obtained. According to claim 3, the lid body can be firmly tightened, and the lid body can be freely attached and detached,
Maintenance and inspection of gauges is also easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a fixing portion of a lid body according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing an enlarged portion A of FIG.

FIG. 3 is a perspective view of the seal packing of the same embodiment.

FIG. 4 is a vertical sectional side view of a fixing portion of a lid body according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a conventional fuel tank.

FIG. 6 is a perspective view of a conventional fuel pump, gauge assembly, and seal packing attached to a lid.

FIG. 7 is a vertical sectional side view of a fixing portion of a conventional lid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tank main body 2 ... Wall surface 3 ... Opening 11 ... Bolt 13 ... Nut 21 ... Seal packing 22 ... Annular thick part 23 ... Annular thin part 25 ... Lid 26 ... Flat part 27 ... Bend edge

Claims (3)

[Claims] 1. A tank main body, an annular seal packing disposed around an opening provided on a wall surface of the tank main body, and a disk-shaped lid for closing the opening via the seal packing. In a fuel tank comprising a body and a fastening member for fixing the lid body to the tank body, the lid body is formed by bending a flat central portion of an outer periphery to the seal packing side over the entire circumference. The seal packing has an annular thick portion interposed between the central portion of the lid and the outer peripheral edge of the opening of the tank body, and the outer peripheral edge of the annular thick portion. And a thin annular portion which is formed in close contact with the wall surface of the fuel tank, and a portion of the flat portion of the lid is closely attached to the thick annular portion of the seal packing, and a bent edge portion of the outer periphery is formed. A fuel characterized by being in contact with the thin annular portion of the seal packing. Charge tank. 2. The fuel tank according to claim 1, wherein a bent edge portion of the lid body is formed in an arc shape at an end portion in contact with the seal packing. 3. The fuel tank according to claim 1, wherein the tightening member includes a bolt and a nut, and a head of the bolt is fixed to the tank body by a bracket.