KR920007768B1 - Valve - Google Patents

Abstract

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Description

valve

1 is a cross-sectional view showing a valve of a first embodiment of the present invention.

2 is a cross-sectional view of a fuel cap in which the valve of the first embodiment is used.

3 is a sectional view of a fuel cap in which the valve of the second embodiment is used.

4 is a sectional view showing the valve of the second embodiment;

5 is a plan view with the upper cover of the fuel cap used in the valve of the second embodiment removed.

6 is a sectional view of a fuel cap in which the valve of the third embodiment is used.

Fig. 7 is a sectional view showing the valve of the third embodiment.

8 is a cross-sectional view showing a conventional valve.

9 is a sectional view of a fuel cap in which a conventional valve is used.

* Explanation of symbols for main parts of the drawings

2a, 22a, 28, 38: sealing part 2a: cap body lid part

22a: cap body step portion 28, 38: valve plate

6, 26, 32a: holding member 6, 26: valve holding plate

32: cap body lid portion 7, 17, 27, 37: valve

7b, 17b, 27b, 27c, 37b: rib portion 17d, 27d, 27e, 27d: weight loss

7h, 17h, 27h, 27i, 37h: top

The present invention relates to a valve used in a valve attachment cap such as a fuel cap of an automobile.

The valves used in conventional fuel caps are shown in Figs. 8 and 9 (see Japanese Patent Application Laid-Open No. 60-116974).

The valve 7 is made of a rubber-like elastic material such as rubber or thermoplastic elastomer, and has a disk shape. The valve 7 protrudes downward from the center thereof, and the assembling hole 6a of the valve holding plate 6, which is a holding member of the valve 7, is provided. The projection 7C which flattens the front-end | tip attached to is formed.

Moreover, the lip | rip part 7b which protrudes upward was formed around the outer periphery end whole of an upper surface. The lip portion 7b is formed around the flow path hole 2b with the lower surface of the corner around the flow path hole 2b opened in the center of the ceiling portion 2a of the cap body 2 facing the valve holding plate 6 as a sealed portion. At the corners, the coil spring (5) holds the lower end of the spring retaining plate (4) to prevent undercut near the lower inner peripheral surface of the cap body (2), and the upper end of the coil spring (5) abuts the lower surface of the valve holding plate (6) The plate 6 is pushed upward together with the valve 7.

In addition, the periphery of the valve 7 is formed thinly by cutting the lower side, and when the valve 7 is attached to the valve retaining plate 6, a gap is provided between the valve retaining plates 6, and the thin portion is The connection part with the thick part near the center was made into the point, and was bent in the axial direction of the valve 7.

3 is an upper lid fitted over the cap body 2, and 10 is a filler neck of the fuel tank.

In use, the fuel cap 1 is lowered together with the valve holding plate 6 against the pushing force of the coil spring 5 when the fuel tank is in a negative pressure state which is equal to or higher than a predetermined value. Since the lip portion 7b is separated from the lower surface of the cap body ceiling portion 2a around the flow path hole 2b to open the flow path hole 2b, air flows into the fuel tank via the flow path hole 2b, It was to relieve the negative pressure.

In the conventional valve 7, since the annular lip 7b protrudes around the entire outer circumferential end of the upper surface, the portion where the lip 7b is formed is thicker than the portion continuous to the lip 7b.

And in this type of valve 7 shaping | molding, for example, when shape | molding and installing a gate below 7 C of central protrusions, a rubber-like elastic material will hold | maintain the inside of a mold cavity from the holding | maintenance part 7a from the lip part 7b. Since the lip portion 7b is thick, the filling pressure of the rubber-like elastic material decreases rapidly at the lip portion 7b, and there is a fear of meat retention. When the air stayed, the surface precision (smooth ±± μm) required for the top 7h of the lip portion 7b pressed against the sealed portion could not be secured in view of the valve opening sensitivity and the sealing characteristic, resulting in a defective product.

SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a valve which prevents the occurrence of air retention at the lip at the time of forming the valve body, thereby obtaining the surface precision required at the top of the lip, and reducing the incidence of defective products. .

A valve body according to the present invention is held by a holding member, and is formed of a rubber-like elastic material, and has a lip portion which protrudes in an annular shape on an upper surface or a lower surface thereof and presses the top to a predetermined sealing portion, wherein the top surface of the lip portion The above-mentioned problem is solved by forming the annular fattening part at the position in the annular width in which the lip part is formed in the lower surface or upper surface which touches the side.

The valve according to the present invention has a configuration in which an annular fat portion is formed at a position within the annular width where the lip portion is formed on the lower surface or the upper surface of the annular lip portion that reaches the top rear surface side, so that the thickness of the lip portion is thinner than the conventional one.

Therefore, since the filling pressure of the rubber-like elastic material filled in the mold cavity when the valve is formed does not drop rapidly at the lip portion, it is possible to prevent the air retention from occurring at the lip portion. And the surface precision requested | required at the top of a lip part becomes easy to be acquired, and the incidence rate of the defective article of a valve body can be reduced.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same member as before.

The valve 17 of the first embodiment shown in Figs. 1 and 2 is disposed in a fuel cap 11 as in the prior art, and is formed in a disk shape from a rubber-like elastic material such as rubber or thermoplastic elastomer, Protrusions 17C as shown above are provided.

Moreover, the annular lip | rip part 17b which protrudes upward is formed in the whole circumference | surroundings of the upper end of the upper surface of the valve 17. As shown in FIG. The lip portion 17b protrudes into a substantially triangular shape, its top 17b protrudes into a substantially triangular shape, and its top portion 17b is a flow path in the cam body ceiling portion 2a which is a sealed portion. It is pressed against the lower surface of the periphery of the hole 2b. In addition, the top 17h is pressed against the lower surface of the periphery of the flow path hole 2b in the cam body ceiling portion 2a serving as a sealed portion. Moreover, the shape which is almost similar to the shape of the lip part 17b just below the top part 17h in the annular width in which the lip part 17b is formed in the lower surface extended to the back surface side of the top part 17h (almost). The fat part 17b of a triangular shape) is formed. The fat part 17d of this 1st Example is a magnitude | size which becomes the thickness of the part which continues the lip part 17b the thickness of the lip part 17b. Therefore, when the valve 17 of the first embodiment is similarly molded, the filling pressure of the rubber-like elastic material filled in the mold cavity is maintained to be substantially constant without sudden drop, thereby preventing the formation of an air reservoir in the lip portion 17b. Can be. In view of the valve opening sensitivity and the sealing property, the surface precision (smoothness, about ± 5 μm) required for the top 17h of the lip portion 17b is easily obtained, and the incidence of defective products of the valve 17 can be reduced. Furthermore, the product cost can be reduced.

Moreover, the thin part is formed in the periphery of the valve 17 like a conventional thing. Moreover, the recessed part 17f is formed around the whole lip part 17b vicinity of the upper surface of the valve 17, and that part becomes a bending support point of the lip part 17b.

Then, the valve 17 is assembled and held on the valve holding plate 6 serving as the holding member via the protrusion 17C, and assembled together in the cap body 2 together with the coil spring 5 or the spring holding plate 4. In the case where the fuel cap 11 is fastened to the filler neck portion 10 of the fuel tank and used, the valve body 17 and the lip portion 17b are normally closed cap caps due to the convenience of the coil spring 5. It presses against the lower surface around the flow path hole 2b in the lid part 2a, and closes the flow path hole 2b. At that time, the rib 17b is a lip portion because two portions of the thin portion around the valve 17 and the connection portion between the thick portion in the center and the portion where the recessed portion 17f on the upper surface of the valve body 17 are formed are bent support points. The error of the wrinkle precision of the cap main body lid part 2a of the sealing part of 17b can be absorbed, and the precision management of the lid part 2a can be made easy.

That is, when the inside of the fuel tank is at a predetermined negative pressure state, the valve 170 is lowered together with the valve holding plate 6 against the biasing force of the coil spring 5, and the flow path hole 2b of the cap body lid portion 2a is provided. The lip part 17b falls from the surrounding lower surface, and the said flow path hole 2b is opened, and air flows into a fuel tank through the flow path hole 2b, and the negative pressure in a fuel tank is eliminated.

In addition, although the valve 17 which operates at the negative pressure was demonstrated in the 1st Example, like the 2nd Example shown in FIG. 3, FIG. 4, the valve 27 which operates at the positive pressure and the negative pressure is applied to this invention. You may apply.

The valve 27 of the second embodiment is formed in a substantially disk shape with the same material as the valve 17 of the first embodiment, the flow path hole 27g is provided in the center, and the upper surface of the valve holding plate 26 is a retaining member. To adhere to and maintain.

Moreover, the annular outer lip part 27b and inner peripheral lip part 27c which protrude below are formed in the circumference | surrounding of the outer peripheral end of the valve 27, and the whole inner peripheral end, respectively. The outer circumferential and inner circumferential lip portions 27b and 27c protrude in a substantially triangular shape, and the portion where the outer circumferential lip portion 27b is sealed is a stepped portion 22a protruding from the inner circumferential surface of the cap body 22 and the inner lip portion 27c is closed. The site | part is the valve board 28 which biases upwards through the coil spring 25B from the spring sheet 22b below the step part 22a. In addition, in the upper surface of the valve 27 which contacts the back side of the tops 27h and 27i of the outer and inner lips 27b and 27c, the position in the annular width where the outer and inner lips 27b and 27c are formed, namely, the top (27h, 27i) A semi-circular outer circumference (27d), the inner circumference so that the thickness of the outer rim (27b) and the inner rim (27c) immediately above the same as the thickness of the portion continuous to each of the lip (27b, 27c) Since the portions 27e are formed respectively, the same effects as in the first embodiment are obtained.

That is, the operating mode at the positive pressure and the negative pressure of the fuel cap 21 will be described. When the fuel tank is in a normal state, the valve holding plate (with the valve 27) against the biasing force of the coil spring 25A will be described. 26 rises, the outer lip portion 27b of the valve 27 falls from the cap main step portion 2a, and a gap is formed therein so that fluid such as air in the fuel tank flows through the flow path hole of the spring sheet 22b. 22c) between the elastic finger 22e formed on the flange portion 22d above the cap body 22 and the upper lid 23 via the flow path hole 29a of the spring sheet plate 29 (see FIG. 6). ) Is released into the atmosphere, and the static pressure in the fuel tank is released. The elastic finger 22e cooperates with a plurality of protrusions 23a protruding from the lower surface of the upper lid 23 to regulate the physical torque of the fuel cap 21.

In the case where the fuel tank is under negative pressure, the valve spring 28 descends against the biasing force of the coil spring 25B, and the inner circumferential lip portion 27C of the valve 27 falls from the valve plate 28. As a gap is generated, fluid such as air passes through the flow path hole 29a of the spring sheet plate 29 and the flow path hole 26b of the valve retaining plate 26 between the elastic finger 22e and the upper cover 23. The negative pressure in the fuel tank is released.

Next, the valve 37 of the third embodiment shown in FIGS. 6 and 7 will be described.

The valve 37 of this third embodiment is formed substantially in an umbrella shape with the same material as the valve 17 of the first embodiment, and is held by the lid portion 32a of the cap body 32.

The valve 37 is fitted into and retained in the assembly hole 32b protruding from the center of the lid portion 32a, which is a lubricating member, and a flow path hole 37g is provided in the center thereof.

Moreover, it is formed in the lip | bulb part 37b which protrudes below (inner side) around the whole outer peripheral end of the lower surface of the valve 37. As shown in FIG. The lip part 37b protrudes in a substantially triangular shape, and the site | part which the lip part 37b seals is a valve plate 38 of a substantially hemispherical shape. The valve plate 38 is conveniently disposed upward by the coil spring 35 against the cap body 32 lid portion 32A holding the valve 37. Moreover, the coil spring 35 is hold | maintained at the lower end in the spring holding plate 32 by which the underkit is prevented by the some rib 32c protruded in the inner periphery of the cap main body 32. As shown in FIG.

Moreover, on the valve 37 upper surface which contacted the back surface side of the top 37h of the lip part 37B, the thickness of the lip part 37b is continuous with the lip part 37b at the position in the annular width where the lip part 37b is formed. Since the approximately semi-circular fattening part 37d is formed so that it may become substantially equal to the thickness of a part, the valve 37 may be comprised like this with the effect similar to 1st Embodiment.

Further, in the valve 37 of the third embodiment, an annular recess 37f is formed near the upper surface inlet portion 37b, and the crimp accuracy of the valve plate 38, which is the closed portion of the lip portion 37b, is defined as the bending point. An error can be absorbed and the precision management of the valve plate 38 can be made easy.

That is, when the operating state of the fuel cap 31 of the third embodiment is described, the valve plate 38 is lowered against the biasing force of the coil spring 35 when the inside of the fuel tank becomes the negative pressure state of the predetermined binarity, and the valve ( The valve plate 38 falls from the lip portion 37b of the 37 and is opened in the flow path hole 37g of the valve 37 to solve the negative pressure in the fuel tank via the flow path hole 37g.

Claims (1)

A valve having a lip portion held by an organic member and formed of a rubber-like elastic material, protruding substantially annularly on an upper surface or a lower surface, and press-fitting a top to a predetermined sealing portion, wherein the lower surface or upper surface of the lip portion touches the top rear surface side. A valve, characterized in that the annular fat belly portion is formed at a position within the annular width where the lip portion is formed.

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