JPH0528087Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a fuel filler cap for automobiles, etc., which has a function of adjusting the internal and external pressure of the tank.

<Prior Art> A typical structural example of a fuel filler cap is one in which the cap body consists of an outer cap on the operation side and an inner cap inserted into the fuel filler cap, as seen in Japanese Patent Publication No. 52-45924. Then, a vent hole is provided inside the inner cap, a valve seat is used around the vent hole, and a positive pressure valve or negative pressure valve with a structure in which a gasket is resiliently supported by a coil spring, etc. is provided on either the front or back side of the vent hole to control the tank internal pressure. The structure was designed to equalize the external pressure.

<Problems to be solved by the invention> Products equipped with such a seal usually have a complex structure that includes a seal holder, a coil spring, a spring holder, etc., are not easy to manufacture, and have variations in valve characteristics. The problem was that it was easy to cause problems and breakdowns.

There have also been attempts to provide this function using rubber alone, but due to the nature of the material, there was a problem in that the properties could not be maintained for a long period of time.

<Means for Solving the Problems> Therefore, the inventors of the present invention have developed a gasket holding portion 2 that holds the gasket in the center of the valve body 1, and a ventilation hole portion 3 that is intermittently provided closer to the outer periphery than the gasket holding portion 2. , a spring acting part 4 that exists between the vent holes of the vent part 3 and exhibits spring properties to open and close the valve when a set pressure is reached, and 5 groups of elastic pieces with cutouts on the outer periphery that are press-fitted or engaged into the cap main body. The problems of the conventional method were solved by creating a disc-shaped elastic plate consisting of the following.

<Function> Since the valve body of the oil filler cap having such a structure is an integral part, it can be installed in the cap body with one touch, and the gasket holding portion 2 inside the gasket holding portion 2 holds the gasket at the center. The spring acting portion 4 exhibits spring properties to open and close the valve when the set pressure is reached, and a group of 5 elastic pieces having notches on the outer periphery are press-fitted or engaged with the cap body to stably hold the cap body within the cap body.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a central vertical sectional view of an automobile fuel filler cap 3, and FIG. 2 is a sectional view taken along line AA in FIG. 1. It is. FIG. 3 is a perspective view of the valve body.

The fuel filler cap shown in this example is of the positive pressure valve type. The cap body consists of an outer cap 10 on the operation side and an inner cap 11 that is screwed into the fuel filler port.
It consists of. These are integrally engaged with each other. The inside of the inner cap 11 is hollow, and a partition wall 18 is provided approximately in the middle thereof, and the valve seat 12 is located on the upper surface of the partition wall 18.
A filter 13 is provided at the inlet of 1. A certain part of the valve seat 12 is narrower than other parts of the vent hole 1.
It has become 4. A rubber or plastic gasket 6 that can cover the entire ventilation hole 14 is circular and has a retaining protrusion in the middle.

The disc-shaped valve body 1, which is a feature of the present invention, holds such a gasket 6. The valve body 1 is made of a material with moderate springiness such as steel, and as shown in FIG.
There is a gasket holding part 2 that is opened to hold the gas, a ventilation hole part 3 consisting of a large number of ventilation holes 7 that are intermittently drilled closer to the outer periphery, and a ventilation hole part 3 that exists between the ventilation holes 7, It consists of a spring acting part 4 that exhibits spring properties to open and close the valve, and a plurality of elastic pieces 5 with cutouts on the outer periphery that are press-fitted or engaged into the cap body.

Because of this structure, when the internal pressure of the tank becomes higher than the predetermined pressure compared to the external pressure, the spring acting part 4 of the valve body 1 moves to the valve opening side (the upper side indicated by the two-dot chain line in Fig. 1). As a result, a gap is created between the valve seat 12 and the packing 6, which acts to lower the internal pressure.

In order to firmly hold the valve body 1 inside, a locking groove 15 is formed on the wall surface of the cavity of the inner cap.
(It may be continuous or intermittent on the circumference) or a locking protrusion may be provided. Further, in order to prevent the valve body 1 from being inserted too much, the stopper portion 16 may be formed by stepping the vicinity of the outer periphery of the valve seat 12.

FIG. 4 shows a second embodiment of the present invention, which is of a negative pressure valve type. The cap body has almost the same structure as the previous example. The structures of the valve body 1 and the gasket 6 are almost the same as in the previous example, but their mounting positions are on the opposite side of the vent hole 14. That is, valve seat 1
2 and the stopper portion 16 are provided on the opposite side compared to the previous example, and the valve body 1 and the gasket 6 are brought into close contact therewith. Because of this structure, when the internal pressure of the tank becomes lower than the predetermined pressure compared to the external pressure,
The spring acting portion 4 of the valve body 1 deforms toward the valve opening side (downward in the drawing), creating a gap between the valve seat 12 and the packing 6, thereby increasing the internal pressure.

FIG. 5 shows a positive/negative valve type according to the third embodiment.
In this example, a gasket 6 having a vent hole 17 in the center is held by a valve body 1a against a valve seat 12a similar to that shown in FIG. On the other hand, the valve body 1b is held on the opposite side of the valve seat 12a, that is, on the opposite side of the partition wall 18 as in the example shown in FIG.
Although this valve body 1b does not have a gasket holding part with a hole in the center to hold the gasket 6 as in the past, the structure of the other parts is the same, and the flat part that protrudes upward becomes the valve seat 12b. He has received Patsukin 6.

Because of this structure, when the internal pressure of the tank becomes higher than a predetermined pressure compared to the external pressure, the spring acting part 4 of the valve body 1a deforms toward the valve opening side, and the valve seat 12 and the packing 6 are connected to each other. A gap is created between them, which acts to lower the internal pressure. Conversely, when the internal pressure of the tank becomes lower than the predetermined pressure compared to the external pressure, the spring acting part 4 of the valve body 1b deforms toward the valve opening side (downward in the drawing).
A gap is created between the valve seat 12b and the packing 6, and the internal pressure can be increased.

<Effects of the invention> The fuel filler cap of the invention has the structure as described above.
Conventional packing holder, coil spring, and spring holder.
Because the parts are integrated into one, there are fewer variations in the product that were previously likely to occur due to valve opening pressure, flow characteristics, and manufacturing tolerances of each part due to the large number of parts, and the number of parts is reduced. Assembling is easy and reliable as there is little friction. Furthermore, by making the cap more compact, the cap can be made thinner, making it easier to incorporate the key and rollover valve. Due to the simplified structure, there are fewer failures and the characteristics can be maintained for a long time. Of course, it is also possible to reduce manufacturing costs.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of the present invention, with Figure 1 being a longitudinal sectional view at the center of an automobile fuel filler cap, and Figure 2 being a sectional view taken along line A-A in Figure 1. be. FIG. 3 is a perspective view of the valve body. 4 and 5 are longitudinal sectional views of other embodiments. DESCRIPTION OF SYMBOLS 1...Valve body, 2...Packing holding part, 3...Vent hole part, 4...Spring action part, 5...Elastic piece, 6...
...Packskin, 7...Vent hole, 10...Outer cap, 11...Inner cap, 12...Valve seat, 13...Filter, 14...Vent hole, 15
... Locking groove, 16 ... Stopper part, 17 ... Ventilation hole, 18 ... Partition wall.

Claims (1)

[Scope of utility model registration request] A fuel filler cap has a structure in which a ventilation hole is provided inside and a positive pressure valve or a negative pressure valve is provided in the ventilation hole to equalize the internal pressure of the tank with the external pressure. A vent hole section 3 is provided intermittently in the cap body, a spring acting section 4 is present between the vent holes of the vent section 3, and exhibits spring properties to open and close the valve when the set pressure is reached, and a spring acting section 4 is press-fitted or inserted into the cap body. A fuel filler cap for an automobile, etc., characterized in that it is provided with a disk-shaped valve body 1 consisting of a group of five elastic pieces having notched outer peripheries that engage with each other.