JP2563604Y2 - Fuel tank cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for a fuel tank of a general-purpose engine or the like.

[0002]

2. Description of the Related Art The cap of a fuel tank of a conventional general-purpose engine is generally formed of metal. Specifically, a cap-shaped main body has an outer portion, an inner portion having a hanging portion fitted to a refueling port, and refueling. It comprises a spring seat which engages with the catch portion of the mouth, a spring which biases the spring seat, and a sealing material such as rubber packing.

[0003]

The above-mentioned conventional fuel tank cap has a large number of parts, and it is necessary to join each part by welding or the like, and to incorporate a spring and a spring seat in the inner part. The number of man-hours is large, the production is troublesome and complicated. As a result, there are disadvantages such as an increase in the cost of the cap. In addition, since rubber packing is interposed in the metal, the compatibility between the materials is poor, and the packing swells and sticks to the bottom of the cap by pressing the cap oil cap and closing the cap. However, there is also a problem that it is difficult to separate the packing when exchanging the packing.

On the other hand, in general-purpose engines and the like, attempts have been made to mold the fuel tank with a synthetic resin to facilitate the manufacture of the fuel tank, reduce costs, and the like, and have been put to practical use.
Conventionally, the cap of the fuel tank made of synthetic resin is of a screw tightening type. Therefore, unlike the above-mentioned conventional general fitting and half-turn locking type, the cap is rotated several times in a screw type and rotated. It is necessary to tighten and lock with force, it is difficult to work, and there are inconveniences such as a large friction torque of opening rotation of the cap when the packing swells and when the packing dries, etc. It is disadvantageous.

The present invention has been made in order to solve the above-mentioned problems. The object of the present invention is to easily attach / detach, firmly and securely locked, and to engage the inner peripheral portion of the fuel filler port with a spring seat. Provided is a fuel tank cap of the formula, in which the cap of the fuel tank is formed of a synthetic resin to greatly reduce the number of parts of the cap, simplify the production as much as possible, and prevent swelling of the sealing material. It is in.

[0006]

Means for solving the above problems are as follows: a grip portion provided with irregularities on the outer periphery of the inverted dish-shaped main body; a fitting portion which is integrally hung on the lower surface of the main body; A hanging support portion provided inside the fitting portion of the main body and integrally formed with the main body, a concave portion provided on a part of the lower surface of the main body, and a sealing member interposed on the lower surface of the main body. A breather portion formed between the main body and the fitting portion, the spring portion locking the base portion to the support portion, and removably locking the front portion to the catch portion of the fuel filler port of the fuel tank which is fixed. And a cap for a fuel tank formed by integrally molding a cap member formed of each part of the support portion with a synthetic resin. Further, the fitting portion which is integrally hung on the lower surface of the main body is a broken circle, and the inner supporting portion is provided at the center of the main body inside the receiving portion of the cylindrical spring seat base and the receiving portion. A cap portion which is suspended and has a columnar portion that locks and locks a locking portion provided at the center of the base of the spring seat, and includes a main body, a fitting portion, a receiving portion, and a support portion including a columnar portion. The fuel tank cap is formed by integrally molding each part with a synthetic resin, and further, the outer peripheral end of the seal member and the end of the seal member set recess on the lower surface of the main body are brought into contact with each other.

[0007]

According to the above means, the cap is fitted into the filler port of the fuel tank, rotated and engaged with the catch part of the filler port by the spring seat, thereby closing the filler port, and the cap can be easily inserted and removed. The friction torque at the time of insertion and removal is also small,
No large force is required for insertion / removal operation, and since it is composed of three members, a cap member, a seal member, and a spring seat integrated with each part of synthetic resin, the number of parts is necessary, and the minimum is sufficient.
A seal member may be interposed on the lower surface of the cap member, and the spring seat may be locked by caulking or the like, so that the structure and production are simple.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a bottom view of the cap of the fuel tank according to the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. FIG.

FIG. 4 is a front view showing an example of a general-purpose engine. The engine 1 is provided with a crankcase 3 on a mounting base 2, and a cylinder block 4 is provided obliquely. , And a cylinder block 5, a head cover 6, and the like are provided on the cylinder block 4.
A box-shaped muffler 7 is disposed on the oblique cylinder head 5, and a fuel supply device such as a carburetor is omitted in the figure.

An output section 8 is provided at the back of the crankcase 3 in the drawing.
Are provided, and an output shaft (not shown) is provided so as to protrude toward the rear surface in the figure, and stays 9 are erected on the crankcase 3.
The fuel tank 10 is supported by the stays 9... The tank 10 is formed of, for example, a press-formed product made of a steel plate material, and is joined to a lower half 11 and an upper half 12 by an intermediate flange 13. A circular opening-shaped refueling section 14 is provided on the section 12,
A circular oil supply port constituting the oil supply section 14 is closed by a cap 20 so as to be detachable. Reference numeral 15 indicated by a broken line in FIG. 4 denotes a crankshaft, 16 denotes a piston, 17 denotes a supply / exhaust valve, and 18 denotes a valve drive mechanism such as a valve rocker arm, a push rod, a drive cam and the like.

The details of the cap 20 are shown in FIGS. 1 to 3. The cap 20 is made up of a cap member 21, a sealing material such as rubber packing, and a spring in which a catch portion of a fuel filler and a tip end engage. Consists of sheets. The cap member 21 is made of synthetic resin and is integrally formed with each part. The main body 22 of the cap member 21 has a disc-shaped concave portion 23 with a large diameter on the lower surface, and is formed in an inverted dish shape. On the outer periphery of the main body 22, concave and convex portions 24 are formed so as to be convenient for fitting and rotating the cap 20 in the filler port, and in the embodiment, the middle portion of the upper surface of the main body 21 is flat. It is formed one step higher.

At the center of the main body 22, a columnar column 25 is formed.
Are suspended and installed integrally, and the columnar portion 25 has a large hanging length. Around the columnar portion 25, a cylindrical receiving portion 26 having a shorter height than that of the cylindrical receiving portion 26 is integrally hung down from the main body and installed, and a fitting portion 27 for a missing fuel tank filler port is provided outside the cylindrical receiving portion 26. It is drooped and installed together. The receiving portion 26 and the fitting portion 27 have the same height, and the lower portion of the columnar portion 25 extends downward from these.

The outer periphery of the receiving portion 26 of the main body 22 is
1 and 3, a groove 29 forming a breather passage is formed in a part of the lower surface of the concave portion 23. As shown in FIGS. The groove 29 communicates with and connects to a part of the deep recess 28.

A sealing member 30 is mounted on the lower surface of the main body 22 of the cap member 21 described above. The seal member 30 has a ring shape having a width in the radial direction and is made of rubber or the like. The seal member 30 has an annular concave portion 32 around the central hole portion 31 and a flat flange portion 33 at the peripheral portion. A breather hole 34 is formed in a part of the annular recess.

The above-mentioned sealing member 30 is provided with a hole 3 at the center.
1 fits elastically around the intermediate portion of the receiving portion 26, and the flange portion 33 has a thick upper half portion fitted into a circular set concave portion 23-1 formed inside the concave portion 23 of the main body 22. The outer end 23-2 of the set recess 23-1 and the outer end 33-1 of the flange 33 are brought into contact with each other. Groove 29 and flange 33
A breather passage 35 is formed between a part of the upper surface and the upper surface. A breather chamber 36 is formed between the annular recess 32 of the seal member 30 and the deep recess 28, and a breather chamber 36 is formed.
And the breather passage 25 are communicated and connected. Furthermore,
The breather chamber 36 communicates with the inside of the fuel tank via a breather hole 34 formed in the annular concave portion 32 of the seal member 30,
When the tank is closed by the cap 20, the inside of the tank is communicated with the outside air.

The seal member 30 has notches 37 between the annular recess 32 and the flange 33, and each piece of the fitting portion 27 is fitted in the notches 37.

After setting the seal member 30 as described above,
The spring seat 40 is mounted. Spring seat 4
Reference numeral 0 denotes a base 41 which is horizontally long when viewed from the bottom and whose middle part bulges in a symmetrical direction in a plane, and connecting parts 42 and 4 which extend right and left from the base.
2. Equipped with locking portions 43, 43 at both left and right ends, the base portion 41 is low and flat in side view, the connecting portions 42, 42 are symmetrically inclined upward and outward, and the locking portions 43, 43 are flat. .

The central base portion 41 has a radially
Are formed on the inner periphery of the mounting hole 45. The mounting hole 45 is set to have an inner diameter smaller than that of the columnar portion 25, and is lightly press-fitted from below the columnar portion 25 and fitted. The inner periphery of the mounting hole 45 is deformed downward and outward by the notch portions 44..., Bites into the periphery of the columnar portion 25, is combined, locked, and supported. At this time, the portion near the outer periphery of the base 41 abuts on the lower end of the receiving portion 26 and is positioned. The bases of the locking portions 43 support the lower surface of the annular concave portion 32 of the seal member 30 near the outer periphery from below, and prevent the lower portion from dropping downward. The tip extends in the outer diameter direction from the gap.

In the above, the cap 20 is fitted to the fuel filler port of the fuel tank via the fitting part 27, and the locking parts 43, 43 of the spring seat 40 are inserted into the fuel filler opening from the lacking part of the fuel filler port. The catch engages with the mouth and the cap 20
Is rotated, so that the catch portion and the locking portions 43 and 4 are rotated.
The cap 20 is tightened by the elastic engagement of 3, and the flange portion 33 of the seal member 30 is crimped to the upper end of the fuel filler. Therefore, it functions similarly to this kind of metal cap.

[0020]

[Effect of the invention] As is clear from the above, according to the invention,
In the cap of the fuel tank, which is fitted to the filler port, the elastic action of the spring seat and the catch part of the filler port, the cap is detachably attached to the filler port, and all parts of the cap member are integrally formed of synthetic resin, This is a structure with a seal member attached and a spring seat attached, so the number of parts is enough for three points, and the attachment of the seal member is inserted from below, and the assembly of the spring seat is lightly pressed into the columnar part. good. Therefore, the number of parts is greatly reduced compared to this type of conventional cap, and a minimum of different functions and materials is sufficient.
In addition, assembling of each part is extremely easy, manufacturing is extremely simple, and a cap of this kind can be obtained at a very low cost together with a drastic reduction in the number of parts.

Next, since the cap is made of a synthetic resin and is not of a screw type as in the prior art, it is easy to insert into and remove from the oil filler, and since the cap member is made of a synthetic resin, the compatibility with the rubber sealing material is good. It is also possible to avoid a situation in which the cap member and the seal member are irremovably coupled due to swelling of the seal member,
Furthermore, since the outer peripheral end of the seal member and the concave end of the cap body are brought into contact with each other, swelling can be prevented, and a structure in which the above-described cap member is joined with a plurality of components as in the related art is adopted. However, since it is an integrally molded product of a synthetic resin, there are many effects such as an improved sealing effect.

[Brief description of the drawings]

FIG. 1 is a bottom view of a fuel tank cap according to the present invention.

FIG. 2 is a cross-sectional view of the fuel tank cap of FIG. 1 taken along line 2-2.

FIG. 3 is a sectional view of a main part taken along line 3-3 in FIG. 2;

FIG. 4 is an external view of a general-purpose engine including a fuel tank.

[Description of Signs] 10: fuel tank, 14: refueling unit, 20: cap, 21: cap member, 22: main body, 23-1
... set concave part, 23-2 ... seal member contact end of set concave part, 25 ... columnar part, 26 ... receiving part, 27 ... fitting part, 30 ... seal member, 33-1 seal member end part, 40 ... spring Seat, 43 ... locking part.

Claims (3)

(57) [Scope of request for utility model registration] 1. A grip portion provided with irregularities on the outer periphery of an inverted dish-shaped main body, a fitting portion which is integrally hung on a lower surface of the main body, and provided inside a fitting portion of the main body and integrated with the main body. A suspended portion, a breather portion formed between a concave portion provided on a part of the lower surface of the main body, and a seal member interposed on the lower surface of the main body, and a base portion locked and stopped by the support portion. A spring seat for detachably engaging the tip of the fuel tank with a catch portion at a filler port of the fuel tank, and a cap member comprising the main body, the fitting portion, and the support portion integrally formed of synthetic resin. A cap for a fuel tank, comprising: 2. The fitting part which is suspended from the lower surface of the main body is formed in a partially circular shape, and the inner supporting part is provided with a receiving part of a cylindrical spring seat base and a main body inside the receiving part. It comprises a columnar portion that is suspended at the center and locks and locks the locking portion provided at the central portion of the base of the spring seat, and includes a main body, a fitting portion, a receiving portion, and a support portion including a columnar portion. 2. The fuel tank cap according to claim 1, wherein each of said cap members is integrally formed of a synthetic resin. 3. The fuel tank cap according to claim 1, wherein an outer peripheral end of the seal member and an end of a seal member set concave portion on a lower surface of the main body are brought into contact with each other.