JPS6330709Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cap for a fuel tank of a vehicle, and particularly to a cap for a fuel tank that can prevent leakage of fuel within the tank in the event of a vehicle collision.

[Conventional technology]

Conventional fuel tank caps that can prevent fuel from leaking in the tank in the event of a vehicle collision consist of a cap body that is screwed onto a fillet neck and a lid that is integrally formed with the cap body. A cap that has a fragile part such as a cutout groove in the joint between the cap body and the lid, or a cap that is made by fitting the cap body and the lid, and the cap body at the fitting part of both.
Some caps are equipped with a similar fragile part, and in these caps, when an external force exceeding a certain level is applied to the lid, the fragile part breaks and only the lid comes off, leaving only the cap body in the fillet of the tank. This makes it possible to prevent fuel leakage (for example, Japanese Patent Application Laid-Open No. 55-55950, Japanese Utility Model Publication No. 57-18288).

[Problem that the invention attempts to solve]

However, in these conventional caps, in the event of a collision, these fragile parts do not necessarily break and only the cap body remains, and there is a risk that the cap body may also be damaged and fuel may leak. .

[Purpose of invention]

This idea was created in view of the above problems.
When attaching the cap to the fillet neck, it is possible to control the tightening torque, and in the event of a vehicle collision, only the cover body can be easily removed, leaving only the cap body on the fillet neck of the tank. It is an object of the present invention to provide a fuel tank cap that can prevent fuel leakage.

[Means for solving the problem]

The fuel tank cap according to the present invention includes a cylindrical portion having a threaded portion on the outer peripheral surface and a valve mechanism inside, and a flange integrally formed at the upper end of the cylindrical portion with a diameter larger than the outer diameter of the cylindrical portion. a cap body which is screwed onto the fillet neck of the fuel tank; and a cap body which covers the cap body and is removably attached to the cap body; a lid that separates from the cap body when an external force is applied; a lid that is attached to a jaw of the cap body that is formed to protrude radially outward due to the diameter expansion, and seals between the fillet neck and the cap body; In a fuel tank cap made of an elastic sealing material, the cap body has a plurality of recesses or protrusions on the inner wall thereof, each having an inclined edge surface in the direction of tightening rotation of the lid and the direction of removal of the lid. The lid body is provided with a sleeve that hangs concentrically downward from the lower surface of the lid body and has a plurality of slits that are open at the lower end. Protrusions or recesses that engage with the provided recesses or protrusions and have a shape corresponding to these recesses or protrusions are provided, and by the action of these recesses, protrusions, and slits, tightening torque can be controlled and external force greater than a predetermined amount can be applied. This made it possible for the lid to be removed.

[Effect of invention]

With this invention, it is possible to control the torque when attached to the fillet neck, and if an external force exceeding a predetermined level is applied to the lid in the event of an accident, the sleeve of the lid is easily deformed by the slit, so that the concave and convex portions are separated. When the cap is disengaged, only the lid can be easily removed, leaving the cap body securely in the fillet neck of the tank.

In particular, the front edge of the cap main body's recesses or protrusions, and the lid sleeve's protrusions or recesses that engage with these recesses or protrusions, are not only in the tightening rotation direction, but also in the lid removal direction. Since the side edge is also formed with an inclined edge surface, not only the tightening torque is controlled during tightening rotation, but also the detachment of the lid when an external force exceeding a predetermined level is applied to the lid is controlled by the engaged recess. This easily occurs due to the slippage of the sloped edges of the side edges of the convex portion and the convex portion.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of a fuel tank cap according to the present invention.

As shown in FIG. 1, the cap main body A includes a cylindrical portion 1 having a threaded portion 2 on the outer peripheral surface and an arbitrary valve mechanism (not shown) inside, and a cylindrical portion 1 at the upper end of the cylindrical portion 1. It consists of a short cylindrical flange part 3 integrally formed with a diameter larger than the outer diameter of the flange part 3.

This cap body A is connected to the threaded portion 2.
The threaded portion of the fillet neck 12 is screwed together to engage the fillet neck 12.

On the upper inner wall of the cap body A, six house-shaped recesses 5 as shown in FIG. 3 are provided at equal intervals. The recess 5 is formed such that a triangular edge 5a corresponding to a house-shaped roof faces in a tightening direction a (FIG. 5) of the lid B, which will be described later. Further, the recess 5 has an edge in which the triangular edge 5a and the side edge 5b corresponding to the house-shaped wall are inclined toward the bottom surface of the recess 5, as shown in FIGS. 2 and 3. It is a sloped surface,
Further, the rear edge portion 5c corresponding to the floor portion of the house shape is a vertical surface that hangs down toward the bottom surface of the recessed portion 5.

Cylindrical portion 1 and flange portion 3 of this cap body A
is made of synthetic resin and is usually integrally molded by injection molding.

On the other hand, as shown in FIG. 1, the lid body B which is detachably attached to the cap body A is
a top plate 6 consisting of a disk-shaped portion covering the top plate and an annular side wall hanging downward from the outer periphery of the top plate 6; a handle portion 7 integrally formed on the upper surface of the top plate 6;
It consists of a sleeve 10 which is integrally and concentrically formed at a position corresponding to the inner wall of the cylindrical portion of the cap body A on the lower surface thereof and which hangs downward.

Furthermore, this sleeve 10 has an equal number of house-shaped protrusions 8 on its outer wall, which engage with the recesses 5 of the cap body A, at equal intervals at positions corresponding to the recesses 5, and between these protrusions. It has a slit 9 which is open at the lower end.

That is, the house-shaped convex part 8 has a similar shape to the concave part 5, as shown in FIGS. The sleeve 10 has a triangular edge 8a and a side edge 8b having an inclined surface, and a rear edge 8c having a vertical surface standing vertically from the sleeve 10.

This lid body B is also made of the same synthetic resin as the cap body A, and is usually integrally molded by injection molding.

A rubber O-ring 11 is interposed in the cap body A as an elastic sealing material in order to seal between the filler neck 12 and the cap body A when the filler neck 12 is tightened.

This O-ring 11 is formed so as to protrude radially outward due to the enlarged diameter of a flange portion 3 formed at the upper end of the cylindrical portion 1 of the cap body A with a diameter larger than the outer diameter of the cylindrical portion 1. The cap body A is attached to the jaw portion 4 of the cap body A, and is designed to seal between the fillet neck 12 and the cap body A.

A fuel tank cap having such a structure is constructed by connecting the cap body A and the lid B by pressing the sleeve 10 of the lid B against the inner wall of the cap body A and engaging the uneven portions 5 and 8 formed on the two. After that, remove O-ring 1
1 and screwed onto the fillet neck 12 as shown in FIG.

Next, the function of this cap will be explained.

Holding the handle part 7 of the lid body B, remove the cap.
The O-ring 11 is screwed into the fillet neck 12 until it abuts the upper edge of the fillet neck 12. During this screwing, the rotational torque accompanying the twisting of the cap is extremely small, so the rotational force of the lid B is directly applied to the cap body A via the uneven portions 5 and 8.
The rotational force is generated, and the cap is screwed into the fillet neck 12 as a unit.

Even after the O-ring 11 contacts the upper edge of the fillet neck 12, when the cap is further twisted, the uneven portions 5 and 8 of the cap body A and the lid body B are rotated.
is resisting the frictional force on the inclined edge surfaces of the respective triangular edges 5a, 8a, the cap is
The O-ring 11 is screwed into the fillet neck 12 while being compressed and deformed. By compressing the O-ring 11, the cap body A and filler neck 12 are reliably sealed.

Further, when the cap is twisted, the uneven portions 5 and 8 cannot resist the frictional force, and only the lid B rotates idly. That is, when a tightening torque exceeding a predetermined value is applied to the lid B, the slit 9 of the lid B is deformed, and the triangular edges 5 of the uneven parts 5 and 8 are deformed.
Since slippage occurs on the sloped edges of a and 8a, the cover B
The convex portion 8 projects from the concave portion 5 of the cap body A and rotates. This prevents a torque exceeding a predetermined value from being applied to the cap, so that the cap body A always seals the filler neck 12 with a predetermined tightening force via the O-ring 11, and also seals the cap body A and the lid. Even if both body B are made of synthetic resin, they will not be damaged by over-tightening. Further, the O-ring 11 will not be damaged due to excessive tightening.

When removing the cap, grasp the handle member 7 of the lid B and twist it counterclockwise.
The rotational force at this time is such that when the cap body A and the lid body B rotate counterclockwise, the vertical rear edges 5c and 8c of the uneven parts 5 and 8 collide with each other. The rotational force of the lid body B directly becomes the rotational force of the cap body A, and the cap can be removed as one piece.

By the way, if a car in which the fuel tank cap according to the present invention is attached to the filler neck 12 of the fuel tank encounters a collision and an external force of more than a predetermined level is applied to the lid body B, the uneven parts 5 and 8 will be formed on the rear trailing edge of the fuel tank. 5c, 8
The parts other than c, that is, the triangular edges 5a, 8a and the side edges 5b, 8b, are all sloped edges, so they easily slide against such external forces and the slit of the sleeve 10 of the lid B By reducing the diameter of 9, the engagement relationship between the two can be easily released. That is, when the lid body B receives the above external force, the uneven parts 5 and 8 are displaced and the sleeve 1
The sloped edge surface of the side edge 8b of the convex portion 8 provided at the cap body A is easily removed from the sloped edge surface of the corresponding portion of the concave portion 5 of the cap body A. Therefore, only the lid body B can be removed without causing any damage to the cap body A, and the cap body A can be securely left in the filler neck 12 without leaking fuel.

In the fuel tank cap configured as described above, an edge consisting of side edges 5b and 8b is located at a position in the recess 5 of the cap body A and the protrusion 8 of the lid B in the attachment/detachment direction of the lid B. Since the sloped surface is formed, it is not only easy to remove the cap due to the sliding action on the sloped surface of the upper side edges 5b and 8b in the drawing when the above-mentioned abnormal external force is applied, but also it is easy to remove the lid B when assembling the cap. When attaching to the cap body A, attach the lid body B.
The convex portion gradually rides on the inner circumferential surface of the cap body A from the sloped edge of the lower side edges 5b and 8b in the drawing, making it easy to attach the lid B to the cap body A. become.

In addition, the lower side edges 5b and 8 in this drawing mentioned above
Since the effect of the sloped edge surface of b is not the purpose of the present invention, the lower side edges 5b, 8b do not necessarily have to be sloped surfaces, but if this portion is an edge, Since the tightening torque value based on the edge slope of the leading edge may be incorrect, the upper and lower side edges are usually made to have symmetrical edge slopes.

7 to 9 show recesses formed in the cap body according to another embodiment of the present invention. In this embodiment, the recess 15 has a dome shape and is used to tighten the lid. An edge inclined surface 17 is formed at a position corresponding to the rotation direction and the lid attachment/detachment direction.

In the fuel tank cap constructed as described above, substantially the same effects as in the embodiment shown in FIG. 1 can be obtained.

10 and 11 show a recess formed in a cap body according to still another embodiment of the present invention. In this embodiment, the recess 19 has a hexagonal shape, and the recess 19 is hexagonal in shape. An edge inclined surface 21 is formed at a position corresponding to the mounting rotation direction and the lid removal direction.

In the fuel tank cap constructed as described above, substantially the same effects as in the embodiment shown in FIG. 1 can be obtained.

12 and 13 show a recess formed in the cap body of another embodiment of the present invention,
In this embodiment, the recess 23 has a rectangular shape, and an edge inclined surface 25 is formed at a position corresponding to the direction of tightening rotation of the lid and the direction of attachment and detachment of the lid.

In the fuel tank cap constructed as described above, substantially the same effects as in the embodiment shown in FIG. 1 can be obtained.

Needless to say, the lid B is provided with a convex portion having a shape corresponding to the concave portion of the cap body A of these embodiments.

[Effect of idea]

As mentioned above, in the present invention, since the lid body and the cap body are assembled by engaging with each other through the concave and convex portions,
It is easy to handle, and even if a collision occurs,
Even if a large force is applied to the cap, only the lid body can be surely removed, and the cap body can be left as it is in the fillet without any damage, thereby reliably preventing leakage of fuel in the tank.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing one embodiment of a fuel tank cap according to the present invention, FIG. 2 is a plan view of the cap body, and FIG. 3 is a sectional view of the cap body.
Figure 4 is a sectional view of the lid, Figure 5 is a bottom view of the lid,
FIG. 6 is a cross-sectional view of main parts showing a state in which the lid is removed, FIG. 7 is a front view showing a recess formed in the cap body of another embodiment of the present invention, and FIG.
9 is a sectional view taken along line - in FIG. 7, FIG. 10 is a front view showing a recess formed in the cap body of still another embodiment of the present invention, and FIG. 11 is a sectional view taken along line - in FIG. 10 is a sectional view taken along line XI-XI, FIG. 12 is a front view showing a recess formed in the cap body of another embodiment of the present invention, and FIG. 13 is a sectional view taken along line - in FIG. 12. It is a diagram. A...Cap body, 1...Cylinder part, 2...Threaded part, 3...Flange part, 4...Jaw part, 5, 15,
19, 23... Concave portion, 5a, 8a... Triangular edge, 5b, 8b... Side edge, 5c, 8c... Rear edge, B... Lid, 8... Convex portion, 9... slit,
10...Sleeve, 11...O-ring (elastic sealing material), 12...Filanet, 17, 21,
25...Edge slope surface.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical part that has a threaded part on its outer circumferential surface and a valve mechanism inside, and a flange part integrally formed at the upper end of this cylindrical part with a diameter larger than the outside diameter of the cylindrical part. A cap body that is screwed onto the cap body; covers the cap body, is detachably attached to the cap body, and rotates idly when a tightening torque of a predetermined level or more is applied, and detaches from the cap body when an external force of a predetermined level or higher is applied. a lid body; for a fuel tank, comprising an elastic sealing material attached to a jaw portion of the cap body formed to protrude radially outward due to the enlarged diameter, and sealing between the fillet neck and the cap body; In the cap, the cap body is provided with a plurality of recesses or protrusions on the inner wall thereof, each having an inclined edge surface in the direction of tightening rotation of the lid body and the direction of removal of the lid body, A sleeve is provided having a plurality of slits that hang concentrically downward from the cap and are open at the lower end, and the outer wall of the sleeve engages with a recess or a protrusion provided on the inner wall of the cap body. , protrusions or recesses of a shape corresponding to these recesses or protrusions are provided, and the action of these recesses, protrusions, and slits enables tightening torque control and detachment of the lid when an external force exceeding a predetermined value is applied. A fuel tank cap characterized by: