JPH08198161A - Inlet device for plastic fuel tanks for small vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] The force to insert and remove the fuel cap from the fuel inlet is small, and the durability of the seal is improved.
(EN) Provided is a resin fuel tank inlet port device for a small vehicle, which does not require replacement of a fuel cap even if a filler is extended to prevent overfilling of gasoline. [Constitution] The filler 14 is made of metal, and the upper portion 1
4A and the lower portion 14B are welded and integrated, and the upper end portion 14a of the upper portion 14A has the upper end portion 1 of the injection port 18.
8a, the filler upper end 14a has a tip 14c that bends inward downward from the bent portion 14b and extends downwardly from the bent portion 14b.
It will be at an intermediate position in the axial direction of. In addition, the fuel cap 2
2, the cap packing 26 is provided at a position facing the filler bent portion 14b in a state where the injection port 18 is closed, and the shaft is provided at a position where the lock claw 20 is engaged with the downwardly directed tip portion 14c. The lower end of the portion 22a is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for a resin fuel tank for a small vehicle, which is provided in an inlet portion of a resin fuel tank of a motorcycle.

[0002]

2. Description of the Related Art Conventionally, there is a motorcycle equipped with a resin fuel tank. FIG. 5 shows the structure of the fuel inlet of this type of fuel tank. The fuel inlet is closed by a push-type fuel cap h. As shown in FIG. 5, the fuel injection port has a cylindrical opening for b standing up from the tank body a, and a cylindrical filler pressing cap body c for covering the outer peripheral surface of the rising opening b and having the inner peripheral surface screwed. And a tubular resin-made filler (filler pipe) d fitted in close contact with the inner peripheral surface of the rising opening b. A flange c1 extending toward the central axis is formed at the upper end of the filler pressing cap body c, and the upper end surface b1 of the rising opening b and the flange c1 of the cap body c face each other along the central axis o. ing. Further, a flange d1 extending in the radial direction is formed on the upper end of the filler d, and the flange d1 is formed between the upper end surface b1 of the rising opening b and the cap body c flange c1 via an inlet side packing e. It is sandwiched between. Further, an annular groove f is formed on the inner peripheral surface of the rising opening b, and the packing g composed of an O-ring or the like housed in the groove f allows the inner peripheral surface of the rising opening b and the outer periphery of the filler d to be filled. The space between the face and the surface is sealed. That is,
Due to the seal between the rising opening b and the filler d,
The packings e and g are provided and are pressed and sealed by the packing e. The pressing force of the pressing seal is generated by screw-fitting the tank rising opening b and the filler pressing cap body c.

Further, the fuel cap h for closing the fuel inlet is provided so as to overlap the cylindrical portion h1 inserted into the filler d and the upper end of the cylindrical portion h1, and a grip portion which spreads like an umbrella. With h2, the whole has a mushroom shape. Further, a lock claw j is provided at the lower end of the cylindrical portion h1 so as to be biased in the axial radial direction, and when the fuel cap h is inserted and attached, the lock claw j is retracted in the retracted state. It enters while sliding on the inner peripheral surface of d, protrudes outward at the lower end surface of the filler d, and engages with the lower end surface. On the other hand, when removing the fuel cap h, the lock bar installed in the fuel cap h is operated with a key to retract the lock claw j toward the center. A seal packing i formed of an O-ring or the like is attached to the groove h11 on the outer peripheral surface of the cylindrical portion h1, and when the cap h is attached to the fuel injection port, the seal packing i seals the fuel cap h. The lock claw is hooked on the lower end surface portion of the filler d by rotating, and the cap h is fixed to the fuel injection port.

[0004]

However, in the conventional fuel inlet having the above-mentioned structure, the seal packing i formed by an O-ring or the like is provided between the fuel cap h fitted therein and the inner peripheral surface portion of the filler d. Since the seal packing i slides on the inner peripheral surface of the filler d when the fuel cap h is inserted into and removed from the fuel injection port, the friction resistance is large, and therefore,
A large pushing force and a pulling force are required when the fuel cap h is inserted into and removed from the fuel inlet. Further, since the seal packing i slides on the inner peripheral surface of the filler d each time the fuel cap h is opened or closed, the durability may be lowered. Further, in order to prevent the fuel tank from being overfilled with fuel such as gasoline, if the filler d is extended downward, the lock bar for operating the lock claw j of the fuel cap h must be extended, and Since the fuel cap must be replaced with another one, there are various problems in that it is disadvantageous in terms of cost and weight.

The present invention has been made in order to solve the above-mentioned conventional problems and requires only a small force for inserting and removing the fuel cap into and from the fuel inlet, thereby improving the durability of the seal and gasoline. It is an object of the present invention to provide a resin fuel tank inlet port device for a small vehicle that does not require replacement of the fuel cap even if the filler is extended to prevent overfilling.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 has the following constitution. That is, the invention of claim 1 is such that a filler is inserted into a rising opening portion of a resin fuel tank for a small vehicle which rises in a cylindrical shape, and the filler is fixed to the rising opening portion by a filler pressing cap body. In an inlet device comprising an assembly type inlet and a fuel cap that engages the filler with a lock claw to close the inlet, the filler is made of metal, and the filler upper end is the filler. The filler is extended above the inlet, the filler upper end is bent inward from the bent portion, and the downwardly directed tip is at an intermediate position in the axial direction of the filler. A seal member is provided at a position facing the filler bent portion in a state where the seal member is closed, and
It is an inlet device for a resin fuel tank for a small-sized vehicle, wherein the lock claw is provided at a position to be engaged with the tip end portion directed downward.

[0007]

According to the invention of claim 1, the upper end of the filler is extended above the injection port, and the upper end of the filler is bent downward from the bent portion and directed downward. A seal member is provided at a position where the tip portion is located at an intermediate position in the axial direction of the filler, the fuel cap is opposed to the filler bent portion in a state where the fuel inlet is closed, and the lock claw is directed downward. Since the seal member is provided at the position where it engages with the tip portion, when the fuel cap is inserted into the inlet, the seal member comes into contact with the bent portion of the filler, and the lock claw engages with the tip portion in this state. Therefore, the fuel cap is fixed to the inlet and the seal is secured.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 are explanatory views of a resin fuel tank inlet device for a motorcycle according to an embodiment of the present invention, FIG. 1 is an explanatory view of a motorcycle, and FIG. 2 is an inlet device of the embodiment. Explanatory drawing, FIG. 3 is an assembly explanatory view of the apparatus, FIG.
FIG. 8 is an explanatory diagram of a modified example of the embodiment.

In the injection port device of the embodiment, as shown in FIG. 2, a filler 14 is inserted into a rising port 12 that stands up in a cylindrical shape in a resin fuel tank 10.
Reference numeral 4 is an assembly type injection port 18 fixed to the rising port portion 12 by a filler pressing cap body 16, and a fuel cap 22 that engages with the filler 14 by a lock claw 20 to close the injection port 18. It is a thing. In addition to the fuel tank 10, the rising opening 12, and the filler pressing cap body 16, the packing 2 between the filler 14 and the rising opening 12 and the filler pressing cap body 16 is provided.
4a and 24b have substantially the same names as those shown in FIG. 5, so only different parts will be described.

The filler 14 is made of metal, preferably
The upper portion 14A and the lower portion 14B, which are made of iron, and each of which has two substantially cylindrical shapes, are welded and integrated. The lower portion 14B has a shape similar to that of the filler d shown in FIG. 5, except that the thickness is different, and the packings 24a and 24b have appropriate sizes and are the same as the packings e and g. It is provided. The lower portion of the upper portion 14A is fitted on the inner peripheral surface of the upper portion of the lower portion 14B, and the overlapped portion is welded and the upper portion is fixed to the lower portion to be integrated. An upper end portion 14a of the upper portion 14A extends above an upper end portion 18a of the inlet 18 (corresponding to an upper end portion of the filler pressing cap body 16), and the filler upper end portion 14a extends downward from the bent portion 14b. The tip portion 14c that bends inwardly toward and faces downward is at an intermediate position in the axial direction of the filler 14. The bent portion 14b has an annular shape when viewed from above and has a shape along a plane.

The fuel cap 22 has a shaft portion 22a extending in the axial direction, and a grip portion 2 provided at the upper end of the shaft portion 22a and having an umbrella-like (or dish-like) peripheral edge that hangs downward.
2b and. The fuel cap 22 is provided with a flat plate annular cap packing (sealing member) 26 on the lower surface of the grip portion 22b at a position facing the filler bent portion 14b in a state where the filling port 18 is closed, and the lock claw 20 is provided. Is provided at the lower end portion of the shaft portion 22a at a position where it engages with the tip portion 14c directed downward. The lower end of the shaft portion 22a is at least the tip portion 14c.
It suffices that the lock claw 20 extends downward by a length corresponding to the length.

According to the embodiment, the sealing structure for the inlet 18 of the fuel cap 22 is such that the cap packing 26 on the lower surface of the fuel cap 22 abuts on the upper end portion 14a (upper end of the bent portion 14c) and seals in the vertical direction. It is a structure that does. Therefore, only by pushing the fuel cap 22 into the inlet 18, a reliable and stable sealing property can be provided. Further, when the fuel cap 22 is opened and closed, the cap packing 26 does not slide on the inner peripheral surface of the filler 14 and the cap packing 26 only comes into close contact with the upper end portion 14a, so that there is no frictional resistance. Therefore, when the fuel cap 22 is inserted into or removed from the fuel inlet 18, the pushing and pulling force is small. Further, since the cap packing 26 does not slide on the inner peripheral surface of the filler 14 every time the fuel cap 22 is opened and closed, the durability is improved.

Further, in order to prevent the fuel tank 22 from being overfilled with fuel such as gasoline, when the filler 14 is to be extended downward, only the lower portion 14B is extended downward and the upper portion 14A of the filler 14 is left as it is. be able to. Accordingly, it is not necessary to change the position of the lock claw 20 of the fuel cap 22, so that the original fuel cap 22 can be used. Therefore, it is not necessary to extend the lock bar, and it is not necessary to replace the fuel cap 22 with another one. Therefore, it is advantageous in terms of cost and weight. Further, by appropriately extending the filler 14, it is possible to easily secure the space volume and prevent the fuel from being overfilled in the tank.

The present invention is not limited to the above embodiment,
The structure of the modification of FIG. 4 can be taken. That is, in the modified example, as shown in FIG. 4, the filler 28 is composed of an upper portion 28A and a lower portion 28B, and is the same as the above embodiment except for the upper portion 28A. The lower end of the upper portion 28A is a flange 28A1 that spreads outward in a brim shape. The flange 28A1 vertically overlaps the flange 28B1 of the lower portion, and the flanges 28A1 and 28B1 are fixed by welding. It is something. Welded flange 28A
1, 28B1 are sandwiched between the rising opening portion 12 and the filler pressing cap body 16 via the packing 24a. In the above-mentioned embodiment, since the weld portion of the filler is open to the outside, it is necessary to weld in a relatively wide range in order to maintain airtightness, but according to this modification, the upper portion 2 of the filler 28 is
Since the welded portion between 8A and the lower portion 28B enters into the packing 24a, airtightness can be reliably maintained even if the welded width of this welded portion is narrower than that of the embodiment. The small vehicle is not limited to a motorcycle, and the present invention can be applied to a small vehicle such as a small three-wheel vehicle or a small four-wheel vehicle having a resin fuel talc.

[0015]

As described above, according to the present invention, the seal structure for the inlet of the fuel cap is a structure in which the seal member on the lower surface of the fuel cap abuts the upper end portion and seals in the vertical direction. Therefore, a reliable and stable sealing property can be provided only by pushing the fuel cap into the inlet. Further, when the fuel cap is opened and closed, the seal member does not slide on the inner peripheral surface of the filler and the seal member only comes into close contact with the upper end portion, so that there is no frictional resistance. Therefore, the force of pushing and pulling the fuel cap when inserting and removing the fuel cap is small.

Further, the sealing member does not slide on the inner peripheral surface of the filler each time the fuel cap is opened and closed, and the durability is improved. Further, in order to prevent the fuel tank from being overfilled with fuel such as gasoline, when the filler is to be extended downward, the upper portion of the filler can be left as it is and it is necessary to change the position of the lock claw of the fuel cap. Since it is not present, the original fuel cap can be used. Therefore, it is not necessary to extend the lock bar, and it is not necessary to replace the fuel cap with another one. Therefore, it is advantageous in terms of cost and weight. Further, by appropriately extending the filler, it is possible to easily secure a space volume and prevent overfilling of the fuel in the tank.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a motorcycle according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional explanatory view of the resin fuel tank inlet device according to the embodiment.

FIG. 3 is an assembly explanatory diagram of the apparatus of FIG.

FIG. 4 is a vertical cross-sectional explanatory view of a modified example of the embodiment.

FIG. 5 is a vertical cross-sectional explanatory view of a conventional fuel tank inlet structure.

[Explanation of symbols]

 10 Fuel Tank 12 Start-up Port 14, 28 Filler 14A, 28A Filler Upper Part 14B, 28B Filler Lower Part 14a Filler Upper End 14b Bent Part 14c Tip 16 Filler Holding Cap Body 18 Pouring Port 20 Lock Claw 22 Fuel Cap 26 Cap packing

[Procedure amendment]

[Submission date] February 7, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

However, in the conventional fuel inlet having the above-mentioned structure, the seal packing i formed by an O-ring or the like is provided between the fuel cap h fitted therein and the inner peripheral surface portion of the filler d. Since the seal packing i slides on the inner peripheral surface of the filler d when the fuel cap h is inserted into and removed from the fuel injection port, the friction resistance is large, and therefore,
A large pushing force and a pulling force are required when the fuel cap h is inserted into and removed from the fuel inlet. Further, in order to prevent the fuel tank from being overfilled with fuel such as gasoline, if the filler d is extended downward, the lock bar for operating the lock claw j of the fuel cap h must be extended, and Since the fuel cap must be replaced with another one, there are various problems in that it is disadvantageous in terms of cost and weight.

Claims (1)

[Claims] 1. An assembling type in which a filler is inserted in a rising opening portion that stands up in a cylindrical shape of a resin fuel tank for a small vehicle, and the filler is fixed to the rising opening portion by a filler pressing cap body. In an inlet device comprising an inlet and a fuel cap that is engaged with the filler by a locking claw to close the inlet, the filler is made of metal, and the filler upper end is located above the inlet. The upper end of the filler is bent downward from the bent portion and the tip end directed downward is located at an intermediate position in the axial direction of the filler, and the fuel cap has the inlet closed. With a seal member is provided at a position facing the filler bent portion,
Further, the resin fuel tank inlet port device for a small vehicle is characterized in that the lock claw is provided at a position where the lock claw is engaged with the downwardly directed tip portion.