JPS6234874A - Cap device for fuel tank of motorcycle, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cap device for a fuel tank of a motorcycle or the like.

(Prior Art) Conventionally, the fuel tank cap of a motorcycle is as shown in FIG.
52), and use the bayonet claw (52) # to tighten the cap (
51) on the lower edge of the injection port, and then press the key cylinder (
53), open the lid (50) and insert the key.

Configured to lock. A check valve is provided that operates to suck in air when the inside of the tank becomes negative pressure, and this valve (55) was provided below the key cylinder (53).

(Problems to be Solved by the Invention) In the above-described conventional technology, a valve including a valve body is provided below the key cylinder.

The hanging protrusion of the cap into the tank becomes large.

The fuel level (F) in the tank needs to be lower than this because it is necessary to ensure the breathing function of the valve, and if the tank has a constant external shape, it will be smaller by the protruding fuel volume.

The present invention has been made to solve the above problems, and its purpose is to make it possible to increase the tank volume and fuel storage capacity without changing the tank external shape. To provide a cap device for a fuel tank of a motorcycle, etc., which can be immediately installed on an existing tank by simply changing the cap without making any changes.

(Means for solving the problem) A means for solving the above problem is to engage the key with a key cylinder that fits into the cap of the fuel tank and has a locking claw in the center. In a fuel tank cap that is operated to engage and disengage and is equipped with a check valve for breathing, a check valve is provided around the key cylinder portion to allow communication between an internal air chamber and the inside of the tank as necessary. That's true.

(Effects of the above means) According to the above means, since the check valve is disposed around the key cylinder portion, the drooping protrusion into the tank is reduced, and the fuel level can be raised.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a side view of a motorcycle (1), and to explain its outline, the front fork (5) that supports the front wheel (4) via the head tube (3) at the front end of the frame (2) can be freely steered. (8) is the handle, and the frame (2)
) The engine (7) is mounted on the front lower part, the fuel tank (8) is mounted on the upper part, and the rear fork (lO) that supports the rear wheel (9) is installed from the rear lower part of the frame (2). A seat rail (11) is attached to a seat rail (201) which is movably pivoted and extends rearward from the frame (2), and (12) in Figure 1 is a fairing.

Fig. 2 is a vertical side view of the cap, and Fig. 3 is a plan view of the cap body. In Fig. 2, (82) is a recess formed in the middle part of the upper piece (81) of the tank (8). (83
) is joined to a cylindrical cap (85), and a hole (84) is formed in the bottom (83) by the upper circumference of the cylindrical piece (86) of the cap (85).
An inner cylindrical piece (88) with a shorter height dimension is suspended from the inner diameter part of the embankment piece (87) which is bent radially inward from the cylindrical piece (86). is injected into the tank (8) from the inner diameter part of the inner cylinder piece (88).

The cap (20) has a cylindrical body (2 ri) that fits with the inner cylindrical piece (88), a flange part (22) is integrally provided on the upper part of this, and a bottom part is provided in the center of the main body (21). A closed key cylinder (23) is provided, and the key cylinder (23) is opened by opening the lid (25) provided in the center of the lid piece (24) on the flange part (22), and the key is inserted to open the main body. The claw (21) protrudes below the inner cylinder piece (88) mentioned above.
B), and remove the cap (20) from the base (85).
It is possible to remove it from the

A concave part (22a) is provided on the flange part (22), and a seal rubber (27) is placed on top of the concave part (22a), and the cover piece (20) is closed from above, and the circle of the key cylinder (23) of the main body (21) is closed. An air chamber (
28) is formed. Such an air chamber (28)
A passage (29) is formed by an upwardly recessed portion provided at the bottom of the seal rubber (27), and communicates the air chamber (28) with the outside air. A main chamber (28a) smaller in height than the main chamber (28a) is installed vertically in a part of the air chamber (28) in parallel with the key cylinder (23), and a large diameter step (28b) is provided at the lower end of the main chamber (28a). A valve body (30) having an H-shaped longitudinal section is fitted therein, an orifice (31) is provided around the horizontally installed partition wall (30a) of the body (30), and a check valve is installed under the orifice. , for example, to face the umbrella valve (32). The valve (32) has a stem (32a
) is supported by the painting wall (30a), and the umbrella part (32b)
is located under the orifice (31) and is normally closed, and both pieces (33) having a through hole (33a) are attached to the lower part of the valve body (30), and the lower end of the body (30) is approximately the same height as the bottom (23a) of the key cylinder (23).

In the above, normally the valve (32) is closed and the inside of the tank (8) is insulated from the atmosphere as shown in Figure 2, but when the inside of the tank (8) becomes free, the umbrella part (32b) moves inside. It bends and deforms to introduce atmospheric air into the tank using the orifice (31), and when the pressure is balanced, it returns to its original state to close the orifice (31) and seal the inside of the tank (8).

Incidentally, the valve (32) including the valve body (31) is approximately at the same height as the bottom (32a) of the key cylinder (23) and does not protrude downward.

Although the embodiment shows a fuel tank for a motorcycle, it can be used for fuel tanks for motorcycles and other fuel tanks.

(Effects of the Invention) As is clear from the above, according to the present invention, in the fuel tank of a motorcycle or the like, the pulp part of the cap does not protrude below the key cylinder part, and therefore the fuel in the tank The liquid level can be raised, and therefore a larger amount of liquid can be stored in a tank with the same internal volume, and the actual internal volume of the tank can be increased without increasing the external dimensions of the tank. This can be done without changing the tank.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a motorcycle, Fig. 2 is a vertical sectional view of the cap, Fig. 3 is a plan view of the cap body, and Fig. 4 is a conventional example. FIG. 2 is a diagram similar to FIG. In the drawing, (8) is the fuel tank, (85) is the cap, and (20) is the fuel tank.
) is the cap, (23) is the key cylinder, (2B)
is a nail. (28) is an air chamber, and (32) is a check valve.

Claims (1)

[Claims] In a fuel tank cap that is engaged and detached by a key engagement with a key cylinder that fits into the cap of the fuel tank and has a locking claw in the center, and is equipped with a check valve for breathing, the key 1. A cap device for a fuel tank of a motorcycle, etc., characterized in that a check valve is provided in the periphery of a cylinder to allow communication between an internal air chamber and the inside of the tank as necessary.