JP2529293Y2 - Evaporation fuel emission control system during refueling in fuel tank - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for suppressing the release of fuel vapor from the fuel supply port to the atmosphere when fuel is supplied to a fuel tank of a vehicle or the like.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional apparatus for suppressing the evaporation of fuel vapor into the atmosphere during refueling of a fuel tank. In this conventional apparatus, an outer peripheral portion of an annular rubber seal packing 03 having a through hole 04 through which an oil supply pipe 029 of a refueling gun G is inserted is baked on a metal reinforcing ring 09, and the reinforcing ring 09 is similarly metallized. The outer ring case 010 and the like are welded, and a shutter valve 07 is attached to a bracket 018.
When the fuel injector 29 is inserted into the fuel filler port 02, the shutter valve 07 is opened at the tip to start refueling, and at the same time, the lip part 05 of the seal packing 03 adheres to the outer periphery thereof, thereby suppressing the release of evaporated fuel to the atmosphere. It is supposed to be.

[0003]

However, in the prior art, a metal reinforcing ring or the like is directly baked on a rubber seal packing, and another outer ring case or the like is welded to the reinforcing ring. During baking and welding, baking heat and welding heat are transmitted to the rubber seal packing, and the seal packing deteriorates and deforms due to the heat, thereby impairing the sealing action and shortening the service life.

The present invention has been made in view of the above circumstances, and is intended to solve the above-mentioned problems by preventing the seal packing from being deteriorated or deformed by heat .
It is an object of the present invention to provide an apparatus for suppressing atmospheric emission of evaporated fuel at the time of refueling in a fuel tank, which has very good workability and a simple structure.

[0005]

[ MEANS FOR SOLVING THE PROBLEMS]
According to the invention of claim 1, when refueling by inserting the lubrication pipe of the lubrication gun into the lubrication port at the end of the lubrication pipe connected to the fuel tank ,
Suppress the release of evaporated fuel from the filler port to the atmosphere
For suppressing the emission of evaporated fuel into the atmosphere during refueling in a fuel tank , the through-hole through which the lubrication pipe can be inserted.
And a synthetic resin holder assembly fixed to the filler port
Shutter valve for opening and closing the inner open end of the through hole
And to seat the shutter valve in the closed position.
An annular valve packing made of elastic material and its valve packing
Seal the through hole and the lubrication pipe closer to the outside than the kin.
An annular seal packing made of an elastic material for
The holder assembly forms an annular space between the inner peripheral surface of the fuel filler port.
The hollow cylindrical intermediate holder to be formed and the intermediate holder
The outer end is integrally connected to the outer end and
And the inner end of the intermediate holder
Consisting of a ring-shaped inner holder and
The seal packing includes the outer holder and the intermediate holder.
A first annular holding portion sandwiched between the valve package and the valve package.
The kin is sandwiched between the inner holder and the intermediate holder.
Second annular holding portions are formed integrally with each other,
An evaporative fuel return pipe is opened on the inner peripheral surface of the filler port facing the space.
You. According to the invention of claim 2, before the invention of claim 1,
In addition to the features described above, the shutter valve may be mounted on the inner holder.
Supported by

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional side view of an oil supply pipe provided with the present invention, FIG. 2 is an end view along line 2-2 of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view taken along line 3-3 in FIG. 1, and FIG. 4 is a longitudinal sectional side view of the fuel supply pipe when a fuel supply gun is inserted into the fuel supply pipe.

In FIGS. 1 to 3, a lubrication pipe 29 of a lubrication gun G is provided in a lubrication port 2 at an outer end of a lubrication pipe 1 made of a metal plate such as a steel plate which communicates with a fuel tank (not shown). (Fig. 4)
It has a through hole 8a through which it can be inserted,
Synthesized resin holder assembly 8 and inner opening of through hole 8a
Shutter valve 7 for opening and closing the end and its shutter
An annular valve pack for seating the valve 7 in the closed position
Kin 16 and the valve packing 16 on the outer side in front
An annular seal capable of sealing between the through hole 8a and the lubrication pipe 29.
And a packing 3 are provided.

The seal packing 3 is for sealing the gap between them when the oil supply pipe 29 of the oil supply gun G is inserted into the oil supply port 2 in a fluid-tight manner, and is annularly formed of oil-resistant rubber material. A through hole 4 for inserting the lubrication pipe 29 is opened at a central portion thereof, and a lip portion 5 which can be in close contact with the outer peripheral surface of the lubrication pipe 29 is integrally formed on an inner peripheral edge thereof. . A first annular holding portion 6 made of an outward flange is integrally formed on the outer periphery of the seal packing 3, and this annular holding portion 6 is connected to a holder as described later.
It is attached to the filler port 2 via the combination 8.

[0010] The holder assembly 8 is provided with
Hollow cylindrical intermediate holder 1 forming an annular space s between
0 and the outer end of the intermediate holder 10
A disk-shaped annular outer holder 9 whose peripheral portion is attached to the filler port 2
And a board integrally welded to the inner end of the intermediate holder 10
And an annular inner holder 14,
9, 10, and 14 are all made of hard synthetic resin materials.
You. That is, the outer holder 9 and the intermediate holder 10, their <br/> abutting welding surface f _1, f ₂ each other is constructed by welding together,
During the welding, the first annular holding portion 6 of the seal packing 3 is integrally held between the abutment welding surfaces f ₁ and f ₂ . The outer side surface of the outer holder 9 is reinforced by a metal reinforcing plate 12, and is eccentric to one side from the center thereof so that the refueling gun G
The through hole 13 that can be inserted into the lubrication pipe 29 is opened.

On the other hand , the inner peripheral portion of the inner holder 14 is integrally welded to the inner end of the intermediate holder 10. At the eccentric position of the inner holder 14 , the inner open end of the through hole 8a is formed.
The valve hole 15 into which the lubrication pipe 29 can be inserted is opened, and is formed integrally with the outer peripheral portion of the valve packing 16 between the outer surface of the inner holder 14 and the inner end surface of the intermediate holder 10.
The second annular clamping portion 16a of the outward are pinched together. The valve packing 16 has an inner peripheral
Lip 1 to the shutter valve 7 there is seated
7 are integrally formed.

[0012] On the inner surface of the inner holder 14, the bracket 18 is fastened, the inner formate via the bracket 18
The shutter valve 7 for opening and closing the valve hole 15 is rotatably supported on the holder 14 via a valve shaft 19.
A valve spring 21 made of a torsion spring is wrapped around 9 to urge the shutter valve 7 to the closed position.

The outer peripheral portion of the outer holder 9 is
And O between the cap receiver 22 which is crimped to the end thereof.
They are sandwiched together via the ring 23 and 24, also the outer peripheral surface of the inner ho <br/> holder 14 is closely fitted to the inner circumferential surface of the fuel supply port 2. Further, a protruding piece 25 protruding from the outer end of the inner holder 14 is engaged with a detent piece 26 welded to the inner peripheral surface of the fuel filler 2. C is a fuel cap covered by the cap receiver 22.

The oil supply pipe 1 is provided with the inner holder 14 (valve).
Downstream and upstream of the hole 15), and the fuel vapor inlet tube 27 leading to the respective fuel tanks (not shown), the canister (evaporated fuel return pipe 28 leading to the not shown) is connected, back in particular fuel vapor The tube 28 faces the annular space s.
Directly on the inner peripheral surface of the fuel supply port 2 that are open.

Next, the operation of this embodiment will be described.

In order to inject fuel into the fuel tank, FIG.
When the lubrication pipe 29 is inserted into the lubrication port 2 of the lubrication pipe 1 as shown in (1), its tip pushes up the shutter valve 7 to open it, and the fuel from the refueling gun G can be supplied to the fuel tank through the lubrication pipe 1. .

At the time of refueling, the lip portion 5 of the seal packing 3 comes into close contact with the outer peripheral surface of the lubrication pipe 29, thereby suppressing the release of fuel vapor from the fuel tank to the atmosphere.

The seal packing 3 and the valve
Since the packing 16 is not overheated by the high-temperature welding heat at the time of assembling to the holder assembly 8, it is possible to surely suppress the release of the fuel vapor into the atmosphere without being altered or deformed. Not only can the seal packing 3 and the valve packing 16 be extended in service life.

Further, seal packing 3, valve packing 1
6 and shutter valve 7
A small set of evaporative fuel emission control devices integrated into a single package
Can it be handled as a three-dimensional (assembly)
Work to assemble them into the filler port 2 is extremely efficient.
It can be performed precisely.

The seal packing 3 and the valve packing 16 may be formed of another elastic material, for example, a soft synthetic resin material.

[0021]

[Effect of the Invention] As described above, according to the present invention, the seal
The outer holder and the holder of the synthetic resin holder
And intermediate holder, and valve packing
Are the inner holder and the intermediate holder in the holder combination.
Since they are sandwiched between each other, the seal packing and
The lube packing is prevented from being deteriorated or deformed by heat at the time of assembling, and its sealing function can be effectively held for a long period of time and its life can be extended.

In addition, the seal packing and the valve
CKIN puts them together in a holder assembly
A small assembly of the evaporative emission control system (assembly
They can be handled as
Work can be performed efficiently and accurately.
The positioning of both packings is also facilitated. Further holder coupling
Form an annular space between the body (inner holder) and the inner peripheral surface of the filler port
And open the evaporative fuel return pipe directly there.
The space is used as an annular evaporative fuel return passage
It is possible to reduce the evaporative fuel return pipe
Out design flexibility increases.

According to the invention of the second aspect, the shutter
A small assembly of the evaporative emission control device
(Assembly) because it can be incorporated into it
To work more efficiently on their filler holes.
Before the assembly work to the filler port
Positioning of the lube and valve packing relative to each other
Can be performed accurately in advance.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an oil supply pipe provided with the device of the present invention.

FIG. 2 is an end view taken along line 2-2 of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a longitudinal sectional side view of the oil supply pipe when the oil supply gun is inserted into the oil supply pipe.

FIG. 5 is a longitudinal sectional side view of a conventional oil supply pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Oil supply pipe 2 Oil filler 3 Seal packing 6 First annular holding portion 8 Holder combination 8a Through hole 9 Outer holder 10 Intermediate holder 14 Inner holder 15 Valve hole 16 as inner opening end of through hole 16 Valve packing 16a Second annular holding Part 28 evaporated fuel return pipe 29 lubrication pipe G lubrication gun s annular space

Claims (2)

(57) [Scope of request for utility model registration] An oil supply pipe (29) of an oil supply gun (G) is inserted into an oil supply port (2) at an end of an oil supply pipe (1) connected to a fuel tank.
When refueling, the fuel from the fuel port (2)
A device for suppressing evaporation of fuel vapor into the atmosphere at the time of refueling in a fuel tank, the device having a through hole (8a) through which the lubrication pipe (29) can be inserted.
Of synthetic resin holder fixed to filler port (2)
(8) and the inner open end (15) of the through hole (8a).
Shutter valve (7) for opening and closing, and its shutter
From elastic material to seat the valve (7) in the closed position
Annular valve packing (16) and its valve packing
The through hole (8a) and the lubrication are located further outward than the pin (16).
An annular shell made of an elastic material for sealing between pipes (29)
And a holder packing (3), and the holder combination (8) is provided between the oil filler (2) and the inner peripheral surface.
Hollow cylindrical intermediate holder forming an annular space (s)
(10) and the outer end of the intermediate holder (10).
A ring-shaped unit that is connected and has an outer periphery attached to the filler port (2)
An outer holder (9) and an inner end of the intermediate holder (10)
A ring-shaped inner holder (14) integrally connected to the
The seal packing (3) includes the outer holder (9).
And a first annular clamping portion clamped between the intermediate holder (10)
(6) The valve packing (16) includes
Sandwiched between the inner holder (14) and the intermediate holder (10)
Are formed integrally with each other.
Is, evaporation in the fuel supply port (2) inner peripheral surface facing the annular space (s)
An apparatus for suppressing evaporation of fuel vapor into the atmosphere during refueling in a fuel tank, characterized in that a fuel return pipe (28) is opened . (2) The shutter valve (7) is connected to the inner
2. The support according to claim 1, wherein the support is supported by a rudder.
Emission of fuel vapor into the fuel tank during refueling
Suppression device.