JPH0767949B2 - Fuel tank cap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank cap , and more particularly to a cap for closing an oil filler port of a fuel tank of an automobile.

[0002]

The cap for closing the filler opening of the Related Art Fuel tank of an automobile, in order to pressure in the fuel tank is prevented from or or depressurized <br/> rises, those having the air vent mechanism is there.

As a conventional cap of this kind, for example, the inner lid that will be fitted to the inside of the outer lid, a bottomed cylinder fitted in the open end of the fuel supply pipe which is provided continuously to the fuel tank Fitting portion, a bottomed cylindrical fitting portion that is fitted into the opening end portion of the fuel supply pipe, an annular groove-shaped receiving portion that receives the opening edge portion of the fuel supply pipe, and the fuel supply pipe when mounted. of the shall and an outer peripheral flange portion positioned outwardly, and bored venting hole in the bottom wall portion and the outer peripheral flange portion of the fitting portion, and these venting holes, the outer lid and the inner lid by the gap between the, there is formed a passage for venting.

[0004]

However, in the case of the simple structure as described above, the fuel may leak together with the vaporized gas from the gas vent hole formed in the bottom wall portion. To solve this problem, the portion of the gas release openings of the bottom wall, the pressure difference between the inside and outside of the cap there is provided a valve which opens when equal to or greater than a predetermined, high cost.

[0005] The present invention aims to provide a fuel tank cap which prevents the never solution the above problems, the fuel leaks from <br/> fuel tank.

[0006]

In order to achieve the above object, the present invention provides a fuel supply cylinder provided on the upper surface of a fuel tank.
Attach the cap that closes the top opening to the inner lid, the intermediate lid, and the outer lid.
The inner lid is attached to the upper end opening of the fuel supply cylinder.
Fits in a cylindrical shape with a bottom and has a gas vent hole.
At the upper end of the joint, outward facing the upper opening edge of the fuel supply cylinder
Equipped with an annular flange and an outward flange on the outside
The middle lid closes the upper end of the inner lid and
Has a communication hole, and the outer lid is fitted to the inner lid and cannot be removed.
And when fitted, line up between the upper surface of the intermediate lid and
So that a gas vent passage is formed between it and the side surface of the inner lid.
And the opposite surfaces of the intermediate and outer lids
By providing a large number of ring-shaped concave and convex portions
To communicate with the gas vent passage, allowing gas to pass but
Fuel is provided with a meandering passage that does not easily pass through.
It has a feature .

[0007]

[Function] Only the vaporized gas flows out of the fuel cap through the meandering passage, and the liquid fuel flows in the meandering passage.
Since it almost never passes through the tank and returns to the inside of the tank, the risk of fuel leakage is extremely small.

[0008]

EXAMPLES Next, an embodiment of the present invention will be described with reference to the drawings. In the opening (1a) on the upper surface of the fuel tank (1), a fuel is provided through an annular sealing material (2) made of synthetic resin or the like having excellent fuel resistance and excellent adhesion. The supply tube (3) is screwed
It is fixed by (4).

[0009] Cap for closing the upper end opening portion of the fuel supply pipe (3) (5), since the inner lid (6) and the intermediate cap (14) and outer lid (7)
Has become .

When the cap (5) is attached to the inner lid (6),
To the upper end of the bottomed cylindrical fitting portion which enter fitted to the upper end opening portion of the fuel supply pipe (3) (6a), the upper end opening edge of the fuel supply pipe (3) Weight
An outward annular flange coupling (6b) provided further annular off
Outside of the lunge (6b) , projects outside the fuel supply tube (3)
Together, also providing the outer countercurrent flange (6c) in which the outer end is downwardly curved
Of.

When the inner lid (6) is covered with the outer lid (7) , the outer lid (7)
Annular ridge provided on the inner side surface of (7a) (7b), said outward flange (6c)
And engaging the outer end lower edge of the inner lid (6) is in a so that the retained on the outer lid (7) in the.

[0012] engaging portion bottom wall (6a) (6a ') in the outer direction brim and (6c) are approximately equally spaced vent holes in the circumferential direction (8) (8') is its
Three holes are drilled each . These vent holes (8)
(8 ') , the inner lid (6) and the outer lid (7) , top and side surfaces
The gap (9) between them forms a gas vent passage (A).

Between the flange (6b) of the inner lid (6) and the outer lid (7)
Close the upper end of the inner lid (6) and place a communication hole (8 ") in place.
The opened intermediate lid (14) is installed. Communication hole (8 ") is in front
The gas vent holes (8) and (8 ') are made to communicate with each other.

As shown in FIG. 2, on the lower surface of the inner lid (6),
Three rectangular engaging piece outer end projecting from the bottom wall of the inner lid (6) (6a ') (10) is, at approximately 120 ° intervals, are secured by screws (11).

[0015] These engaging piece (10), the fuel supply tube (3)
Outward provided at equal intervals on the inner peripheral edge of the inward folding part (3a) at the upper end
After fitted simultaneously notches (12), rotating the entire cap (5), the locking piece (10) is engaging the lower edge of the inward bent portion of the fuel supply pipe (3) (3a) The cap (5) is the fuel supply tube.
It is attached to the open end of (3).

The flange (6b) and the upper end of the fuel supply tube (3)
An annular packing (13) is provided between the inward bent part (3a) and
Secure the seal when the cap (5) is closed.
ing.

The outer peripheral portion of the lower surface of the top wall of the outer lid (7) and the intermediate lid (1
On the outer periphery of the upper surface of 4), there are many rings that bite into each other.
-Shaped uneven parts (15) (16) are provided respectively, and these eating
Due to the concavo-convex portions (15) and (16) , a radial meandering passage (A ') is formed in a part of the gas vent passage (A).
ing. The vertical and radial width of this meandering passage (A ')
Is small so that gas can pass but fuel cannot pass easily.
Has been.

[0018] Thus, Ri by the projection and the depression (15) (16), the air and vaporized gas, can you to move the serpentine passage (A ') in towards the outside, the movement of the liquid fuel Be blocked.
Therefore , there is almost no risk of fuel leakage.
The meandering passage (A ') is the entire surface of the outer lid (7) and the intermediate plate (14) .
It may be provided over . It is also possible as spiral.

[0019]

EFFECTS OF THE INVENTION By providing the above-described serpentine passage having a narrow width , which forms a part of the passage for venting gas, in the gap between the outer lid and the flange of the inner lid, vaporization is achieved. only the gas is moved toward the outside of the fuel cap, liquid fuel, you can not move towards the outside, considerably reducing of the risk of fuel leakage
Can not Rukoto.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a bottom view taken along the line II-II.

[Explanation of symbols]

(1) Fuel tank (1a) Opening (2) Sealing material (3) Fuel supply tube (3a) Inward bent part (4) Screw (5) Cap (6) Inner lid (6a) Fitting part (6a ' ) a bottom wall (6b) flanges (6c) outside toward flange (7) outer lid (7a) in the side face (7b) protruding (8) (8 ') the gas release openings (8 ") hole (9) a gap ( 10) Locking piece (11) Screw (12) Notch (13) Annular packing (14) Intermediate lid (15) (16) Concavo-convex part (15a) (16b) Convex part (15b) (16a) Recessed part (A) Gas vent passage (A ') meandering passage (B) gap

Claims (1)

[Claims] 1. A fuel supply cylinder provided on an upper surface of a fuel tank.
Attach the cap that closes the top opening to the inner lid, the intermediate lid, and the outer lid.
The inner lid can be fitted into the upper opening of the fuel supply cylinder.
In addition, at the top of the bottomed cylindrical fitting part that has a gas vent hole,
An outwardly facing annular flange that overlaps with the upper opening edge of the feed tube
The outer lid is provided with an outward flange, and the intermediate lid closes the upper end of the inner lid and has a communication hole at a proper position.
The outer lid can be fitted into the inner lid in a non-removable manner, and
When mated, between the upper surface of the intermediate lid and the side surface of the inner lid
A degassing passage is formed between them.
On the opposite surfaces of the middle lid and the outer lid,
By providing a number of annular irregularities,
It communicates with the passage, allowing gas but liquid fuel to pass easily.
Fuel tank characterized by having a serpentine passage
Cap for ku.