JPS5842278Y2 - fuel tank cap - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel tank cap installed on a motorcycle or the like, and in particular to a cap equipped with a backing that is crimped onto a seal protrusion surrounding a fuel filler port on the top surface of a fuel tank. It is an object of the present invention to obtain a simple and effective configuration that always effectively protects the protrusion from contamination by dust, muddy water, etc., and allows the backing to cooperate with the seal protrusion to always exhibit a reliable sealing function. purpose.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. T indicates a fuel tank, and the upper plate thereof has a short cylindrical portion 2 defining a fuel filler port 1, and an annular seal protrusion surrounding the fuel filler port 1. 3 is formed, and the cap C of the present invention is attached to the fuel filler port 1.

The main body 4 of the cap C is composed of a bottomed cylindrical plug portion 5 that is fitted into the fuel filler port 1, and a flange portion 6 that protrudes radially from the upper end of the plug portion and faces the seal protrusion 3. The stopper 5 is provided with a locking rod 8 which projects outward through a guide window 7 formed in the side wall thereof and is movable up and down, and a coil spring 9 is installed between the locking rod 8 and the bottom of the plug 5. will be reduced.

The locking rod 8 constitutes a well-known bayonet joint that cooperates with a locking groove (not shown) provided in the short cylindrical portion 2.

An annular backing 10 is attached to the lower surface of the flange 6 by adhesive or the like.

The cap body 4 is provided with an elastic dust-proof boot 11 that contacts the upper surface of the fuel tank T, and the boot is attached to the side U.
It has a circular cross-section and is shaped like a tire as a whole, and surrounds the seal protrusion 3 of the fuel tank T to shield the crimped portion between the protrusion 3 and the backing 10 from the outside. Lower lip edge 11 in contact with the upper surface of the tank T
a is reinforced by embedding a nylon cord or other annular tensile wire 12 therein.

In the example shown in FIG. 1, the boot 11 has an annular Fj13 on the inner circumference.
A mounting portion 13 having a thickness of 1.a is connected to the upper edge, and the lower bent edge 6a of the outer periphery of the flange 6 is fitted into the annular groove 13a of the mounting portion 13, and in the example shown in FIG. integrally formed therewith to extend.

In both cases shown in FIGS. 1 and 2, when the cap C is attached, the elastic force of the spring 9 pulls the flange 6 downward through the plug 5. The backing 10 is pressed onto the seal protrusion 3, and the fuel filler port 1 is closed.

On the other hand, the dustproof boot 11 presses the lower edge 11a of the lip against the upper surface of the fuel tank T by its own elasticity, thereby preventing dust, muddy water, etc. from being sprinkled on the fuel tank T.
1 and prevent contamination of the seal protrusion 3 and the backing 10.

As described above, according to the present invention, the cap body 4 attached to the fuel filler port 1 surrounded by the annular seal protrusion 3 on the upper surface of the fuel tank T is provided with the backing 10 that is crimped onto the seal protrusion 3. In this cap, the cap body 4 is provided with an annular elastic dustproof boot 11 having a horizontal U-shape in cross section, which surrounds the seal protrusion 3 and shields the crimped portion between the protrusion 3 and the backing 10 from the outside. The upper edge of the boot 11 is attached integrally, the lower edge 11a of the boot 11 is tangential to the upper surface of the fuel tank T due to the elasticity of the boot 11, and the tensile wire 12 is embedded in the lower edge 11a of the boot 11. The lower end edge 11a of the boot 11 can always be strongly pushed down onto the upper surface of the fuel tank by the elastic force of the boot 11 itself, and the lower end edge 11a of the boot 11 is uniformly and firmly reinforced in the circumferential direction by the tensile wire 12. This prevents partial deformation and expansion/contraction of the boot lower edge 11a, thereby effectively preventing external dust, muddy water, etc. from entering the boot 11 through the contact area between the boot lower edge 11a and the upper surface of the tank T. Therefore, the seal protrusion 3 can be protected from dust, muddy water, etc. and kept clean at all times, and the sealing function of the backing 10 that attaches properly to the seal protrusion 3 can be maintained well at all times. obtain.

Further, since the upper edge of the boot 11 is integrally attached to the cap body 4, the lower edge 11a is properly attached to the upper surface of the tank T at the same time as the attachment of the cap body 4 to the fuel filler port 1. However, the cap operation will not be complicated.

Moreover, even if the mounting position of the cap body 4 relative to the fuel filler port 1 is slightly displaced due to manufacturing errors of various parts, the displacement can be easily absorbed by the elastic deformation of the boot 11 having a U-shaped cross section. The lower end edge 11a of the boot can always be accurately brought into pressure contact with the upper surface of the tank T without being affected by displacement.

Moreover, since the boot 11 hardly expands the lower edge 11a in the radial direction during its elastic deformation,
Although the tensile wire 12 is buried in the lower end @11a, it will not be forcibly pulled.

[Brief explanation of drawings]

The drawings show an embodiment of the cap according to the present invention, and FIG. 1 is a vertical sectional view of the first embodiment with the right half omitted, and FIG. 2 is a similar sectional view of the second embodiment. C...Cap, T...Fuel tank, 1
...Fuel filler port, 3...Seal protrusion, 4...
... Cap body, 10 ... Backing,
11...Dust-proof boots, 11a...Lower edge, 12...Tensile wire rod.

Claims (1)

[Scope of utility model registration request] The seal protrusion 3 is attached to the cap body 4 attached to the fuel filler port 1 surrounded by the annular seal protrusion 3 on the upper surface of the fuel tank T.
In the cap provided with a backing 10 that is crimped to the cap body 4, the cap body 4 has a transverse cross section that surrounds the seal protrusion 3 and shields the crimped portion between the protrusion 3 and the backing 10 from the outside. U-shaped annular elastic dustproof boots 1
The upper end edge 1 of this boot 11 is attached integrally, and the lower end edge 1 of this boot 11 is attached.
1a is pressed against the upper surface of the fuel tank T by the elasticity of the boot 11, and a tensile wire 12 is embedded in the lower edge 11a of the boot 11.