JPS586731Y2 - fuel tank cap - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a camp for a fuel tank that is attached to an inlet of a fuel tank such as an automobile gasoline tank.

FIG. 1 shows an example of a conventional fuel tank cap. The cap 1 has two claws formed by bending the lower end of an annular backing 3 and an inner cylinder 4 provided on the inner surface of a lid body 2 outward. 5 and 5 are attached to the fuel tank 8 by sandwiching the top and bottom of the cam wall 12 formed by changing the depth of the filler neck 7 that forms the tank's inlet 6, and the banking 3 is attached to the top surface of the filler neck 1. The tank 8 is kept airtight and liquid-tight by being crimped to the tank 8.

In the figure, reference numeral 9 denotes a ring-shaped leaf spring that brings the ring-shaped banking 3 into elastic contact with the top of the filler neck 1.

The intake valve device for introducing outside air and the like are not shown.

Since the tank 8 is completely sealed in this way,
When the outside temperature rises, such as during summer, the pressure inside the tank becomes higher than atmospheric pressure due to fuel evaporation.

In order to remove the camp 1 under this pressure condition, the handle 10
When the cap 1 is twisted by holding it and the claws 5, 5 are aligned with the notches 11, 11 of the filler neck 1 as shown in Figs. 2 and 3, the cap 1 may be blown off by the pressure inside the tank. At the same time, there was an inconvenience in that the fuel in the tank was blown out and scattered outside, giving rise to injuries to workers.

In order to eliminate this inconvenience, conventionally, as shown in FIG.
are provided in two stages with different phases, and the intermediate claws 5a, 5a
Even if the cap 1 matches the notches 11, 11, the claw 5b at the tip gets caught on the cam wall 12 of the filler neck 7, preventing the cap 1 from being blown off.

However, since a large gap was formed between the claw 5a and the notch 11, it was not possible to prevent fuel from scattering from there.

Furthermore, conventionally, as shown in FIG.
In some cases, the outer flange 2a is formed to be long so as to largely cover the outside of the cylindrical portion 7a of the filler neck 1 to prevent fuel from scattering. (Fig. 1) and gets in the way of wearing the camp.

For this reason, for example, if the filler neck 7 is formed high to make it easier to attach the cap 1, the cap 1 will protrude significantly outside the vehicle body, impairing its aesthetics, and this is inconvenient in that it cannot be applied to passenger cars where aesthetics are important.

The object of the present invention is to provide a fuel tank cap that has a simple structure and does not have the above-mentioned disadvantages.

The present invention will be described below with reference to embodiments shown in FIGS. 6 to 10.

In the present invention, the outer flange 2a of the lid body 2 is not formed long,
A guard cylinder 15 having a diameter that can be loosely fitted onto the cylinder part γa of the filler neck 1 and a length that can prevent the internal fuel from scattering is attached to the cap 1 so as to be vertically movable.

The illustrated guard tube 15 has a shape in which a tube portion 15a and an upper wheel plate 15b are connected, the cross section of the peripheral edge is inverted, and the upper wheel plate has an inner hole diameter smaller than the outer diameter of the annular leaf spring 9. 15
b is inserted between the lid body 2 and the annular leaf spring 9 and assembled so that the annular leaf spring 9 with a distance L (Fig. 2) between the two can freely move vertically within the range of its free size. It was installed on.

With this configuration, when attaching the cap 1 to the filler neck 1, the inner cylinder 4, claws 5a, and sb are connected to the inlet 6.
As it is pushed in, the lower end of the cylindrical portion 15a of the guard tube 15 first comes into contact with the banking 14 and stops (Fig. 6). From then on, only the camp 1 is pushed in while sliding on the guard tube 15, creating an airtight and liquid tight state. (Figure 7).

Therefore, the guard tube 15 does not get in the way at all during the operation of attaching the cap 1.

The operation for removing the cap 1 may be performed in the reverse order of the operation for attaching it.

At this time, due to the force with which the guard cylinder 15 largely covers the filler neck 7, the internal fuel that attempts to pass through between the cylinder 4 and the filler neck 7 and eject hits the inside of the guard cylinder 15 and scatters. will be prevented.

Further, in the illustrated embodiment, the inner cylinder 4 is provided with claws 5a and 5b in two stages.

As shown in FIG. 8, since the intermediate pawl 5a is formed by bending a part of the inner cylinder 4, a notch 16 is formed in the chain portion through which the internal fuel is scattered.

Although the presence of the guard cylinder 15 can prevent fuel from scattering, as shown in Figs. By forming a bulge 18.18 having the same outer diameter as the outer peripheral surface of the inner cylinder 4 and engaging with the notch 16, and closing the notches 16, 16, scattering of the internal fuel can be further prevented. Can be done.

It goes without saying that the guard tube 15 of the present invention will have the same effect even if it is installed in a camp that has only one level of claws as shown in FIG.

Further, the guard tube 15 may be provided on the outside of the lid body 2, and the guard tube 15 may be attached to the camp 1 so as to be vertically movable by selectively applying a well-known slide mechanism according to design conditions.

Note that the range in which the guard cylinder 15 can move vertically relative to the cap 1 is at least when the cap 1 is tightened to the filler neck, and when the cap 1 is slightly loosened and the banking 3 pressed against the upper end surface of the filler neck is at the pressure inside the tank. The lower end of the cylindrical portion 15a remains in contact with the upper surface of the banking 14 at all times between the state where it is no longer possible to prevent the cylindrical portion from escaping to the outside.

However, in order for the lower end of the cylindrical portion 15a to prevent fuel from ejecting, the portion that this lower end contacts does not need to be a backing, and may directly contact a part of the vehicle body.

As described above, the fuel tank cap of the present invention is constructed by attaching the guard tube so that it can move freely vertically, so it has a simple structure, can reliably prevent fuel from scattering, and the filler neck The guard tube does not get in the way when attaching or removing the cap, and if the guard tube is configured as shown in the figure, it can be easily attached by making a slight change to the conventional cap assembly order, making it highly versatile and cost-effective. It also has great practical effects, such as a lower floor.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional fuel tank cap, with Figure 1 being a longitudinal side view showing the state in which it is attached to a filler bolt, and Figure 2 being a longitudinal side view showing the state in which it has been turned to the removal position. Fig. 3 is a partial bottom view of Fig. 2, Fig. 4 is a view similar to Fig. 2 showing another example of the conventional example, and Fig. 5 is a view similar to Fig. 1 showing another example of the conventional example. , Fig. 6 and subsequent figures show one embodiment of the present invention, Fig. 6 is a view similar to Fig. 2, Fig. 7 is a view similar to Fig. 1, Fig. 8 is a perspective view of the inner cylinder, and Fig. 9. 10 is a bottom view of the notch portion of the inner cylinder, and FIG. 10 is a perspective view of the inner cover. 1: Fuel tank camp, 4: Inner cylinder, 5: Claw, 6: Inlet, 7: Filler neck, 8: Fuel tank 15: Guard cylinder, 16: Notch, 17: Inner cover.

Claims (1)

[Scope of utility model registration request] A guard cylinder separate from the lid 2 and interposed between the outer surface of the filler neck 7 forming the inlet 6 of the fuel tank 8 and the inner surface of the outer flange 2a of the lid 2 or outside the outer flange 2a. 15 to the outlet of the internal fuel that is about to be blown out of the tank due to the pressure inside the tank, and the lower end of the guard tube 15 is placed between the closed state and the state where the cap is loosened so that gasoline is blown out. The fuel tank camp is characterized in that the fuel tank cap is vertically movably supported by abutting against a backing 14 surrounding a filler neck or the vehicle body.