JPS63135670A - Valve element - Google Patents

Abstract

PURPOSE:To facilitate the accuracy management of a lip section and a seal part, by forming a thin wall part in an arm section in the vicinity of the lip section adapted to make into press-contact with the seal section. CONSTITUTION:A valve 17 is disposed on a hold part 6 so as to form a predetermined gap between an arm section 17a and a hold member 6. An arm section 17c has a thin wall part 17g in the vicinity of the lip section 17d. When the lip section 17d is made into press-contact with a seal section 2a, the lip section 17d is bend about at two points as fulcrums, that is, the connecting part between the lip section 17d and a holder part in the arm section 17c and the thin wall part 17g, and therefore errors in wavy accuracy may be adsorbed greatly. Accordingly, it is possible to facilitate the accuracy management or the lip section 17d and the seal section 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a valve body used in a valved cap such as an automobile fuel cap.

<Prior art> In the valve body used in the conventional fuel cap, the ninth
There was one shown in Fig.
(See Publication No. 4).

The valve body 7 is approximately disc-shaped and made of a rubber-like elastic material such as rubber or thermoplastic elastomer, and has an expanded tip that protrudes downward from the center and is assembled into the assembly hole 6a of the valve body holding plate 6. a holding portion 7a having a protrusion 7b extending therefrom;
It was provided with an arm portion 7c extending radially outward from the holding portion 7a parallel to the valve body holding plate 6, and a lip portion 7d projecting upward around the entire circumference of the tip end of the arm portion 7c.

The lip portion 7d uses the lower surface of the periphery of the flow passage hole 2b, which is bored in the center of the top plate portion 2a of the cap body 2 facing the valve body holding plate 6, as a sealing part, and a coil is attached to the periphery of the flow passage hole 2b. They were pressed together by the biasing force of the spring 5. Note that this coil spring 5 has its lower end held by a spring holding plate 4 that is undercut and fixed near the lower part of the inner circumferential surface of the cap body 2, and its upper end abutted against the lower surface of the valve body holding plate 6 to hold the holding plate. 6 is urged upward together with the valve body 7.

The valve body 7 has an arm portion so that a predetermined gap is formed between the back surface of the arm portion 7c and the valve body holding plate 6 when the lip portion 7d is not in pressure contact with the circumference of the flow passage hole 2b. 7
c An annular groove 7e was formed on the back surface. This annular groove 7e
Considering the surface accuracy (especially waviness accuracy) of the lower surface of the periphery of the flow passage hole 2b, the valve body holding plate 6, the lip portion 7d, etc. in the top plate portion 2a of the cap main body, the lip portion 7d is the same as the arm portion 7c.
It is provided so that it can easily bend in the axial direction of the valve body 7 using the connecting portion with the holding portion 7a side as a fulcrum to absorb errors in the accuracy of waviness of each portion.

In addition, 3 is a top lid fitted to the upper part of the cap main body 2, and 10
is the fuel tank filler neck.

During use, when the inside of the fuel tank is in a negative pressure state exceeding a predetermined level, the valve body 7 resists the biasing force of the coil spring 5 and the valve body holding plate 6
The channel hole 2b of the cap main body top plate 2a
Since the lip portion 7d separates from the lower surface of the periphery and opens the flow passage hole 2b, air flows into the fuel tank through the flow passage hole 2b, eliminating the negative pressure state within the fuel tank. .

<Problems to be Solved by the Invention> In the conventional valve body, an annular groove 7e is formed on the back surface of the arm portion 7C, and when the lip portion 7d is in non-pressure contact with the top plate portion 2a, the valve body is held between the back surface of the arm portion 7C and the valve body. A predetermined gap is formed between the lip portion 7d and the plate 6, and the lip portion 7d is easily bent in the axial direction of the valve body 7 using the connection portion with the holding portion 7a in the arm 7C as a fulcrum, and the lip portion 7d is easily bent in the axial direction of the valve body 7. Even if the waviness precision of the lower surface of the periphery of the flow passage hole 2b, the valve body holding plate 6, the lip portion 7d, etc. was not very sufficient, errors in these parts could be absorbed.

However, when operating the valve body 7 with a small pressure by using a coil spring 5 with a low spring constant, the arm portion 7
It is not enough to provide a predetermined gap on the back surface of the cap, and strict control is required for the waviness accuracy of the lip portion 7d and the top plate portion 2a of the cap main body, which is the sealing portion thereof.

This invention can solve the above-mentioned problems, and can further absorb errors in waviness accuracy, making it easier to control the accuracy of the lip of the valve body and its sealing area, and making it possible to operate under low pressure. It is also an object of the present invention to provide a valve body that can be easily handled.

<Means for Solving the Problems> The valve body according to the present invention includes an arm portion extending from a holding portion held by the holding member substantially parallel to the holding member, and an arm portion protruding from the tip of the arm portion and attached to the holding member. In the valve body, the valve body is provided with lip portions disposed opposite to each other and pressed against the sealing portion, and the arm portion is disposed with a predetermined gap with respect to the holding member,
The above-mentioned problem is solved by forming a thin portion in the arm portion near the lip portion.

<Operations and Effects of the Invention> In the valve body according to the present invention, the valve body is disposed with respect to the holding member such that there is a predetermined gap between the arm portion and the holding member, and the arm portion near the lip portion Since the lip portion has a thin wall portion, when the lip portion is pressed against the sealing portion, the lip portion bends about two points: the connecting portion with the holding portion in the arm portion and the thin wall portion. Compared to conventional valve bodies, since a thinner part is added to the bending fulcrum of the lip part, errors in the waviness accuracy of the lip part and its sealing part can be further absorbed.

Therefore, the valve body according to the present invention can absorb errors in waviness accuracy to a greater extent than conventional valve bodies, facilitate precision control of the lip portion and its sealing area, and can operate under low pressure. can be easily dealt with.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In addition, the same reference numerals are attached to the same members as in the conventional case.

The valve body 17 of the first embodiment shown in FIGS. 1 and 2 is disposed in the conventional fuel cap 11, and is approximately disc-shaped and made of a rubber-like elastic material such as rubber or thermoplastic elastomer. A holding portion 17a is provided at the center and has a protrusion 17b that protrudes downward and has a protrusion 17b with a bulging tip so as to be assembled into the assembly hole 6a of the substantially disc-shaped valve body holding plate 6. The valve body 17 also includes an arm portion 17c that extends radially outward from the holding portion 17a parallel to the valve body holding plate 6, and an arm portion 17c that protrudes downward from the entire circumference of the distal end of the arm portion 17c to hold the valve body of the cap body 2. An annular lip portion 17d is provided that seals the lower surface of the periphery of the channel hole 2b in the top plate portion 2a facing the plate 6. Furthermore, this valve body 17 is provided on the lower surface of the arm portion 17c so that when the valve body 17 is assembled to the valve body holding plate 6 via the holding portion 1a, the arm portion 17c and the valve body holding plate 6 are attached to each other. An annular groove 17e is provided so that a predetermined distance 11ih is provided between them.

In this valve body 17, a recess 17f is formed on the entire circumference near the lip portion 17d on the upper surface of the arm portion 17c, and a thin wall portion 17g is formed in an annular shape over the entire circumference near the lip portion 17d of the arm portion 17c.

The valve body 17 of the first embodiment is assembled and held on the valve body holding plate 6 via the holding part 17a, and is assembled into the cap body 2 together with the coil spring 5 and the spring holding plate 4. When used by tightening the filler neck 10 of a tank, normally the valve body 17 is
The lip portion 17d is pressed against the lower surface of the periphery of the channel hole 2b in the cap body top plate portion 2a, which is the sealing portion, by the biasing force of the coil spring 5, thereby closing the channel hole 2b. At that time, the lip portion 17d is connected to the arm portion 1.
The connection part with the holding part 17a in 7c and the arm part 1
Since the thin wall portion 17g of the lip portion 7c and the thin wall portion 17g serve as flexure fulcrums, it is easy to absorb errors in the waviness accuracy of the lip portion 17d and its sealing portion, the top plate portion 2a of the cap body. The effect is similar to that described in the column.

Incidentally, when the inside of the fuel tank becomes a negative pressure state higher than a predetermined value, the valve body 17 perforates the biasing force of the coil spring 5 and descends together with the valve body holding plate 6, thereby lowering the cap main body top plate portion 2a.
Since the lip portion 17d separates from the lower surface of the periphery of the flow passage hole 2b and opens the flow passage hole 2b, air flows into the fuel tank through the flow passage hole 2b, eliminating the negative pressure state in the fuel tank. It is something to do.

In the valve body 17 of the first embodiment, an annular groove 17e is provided on the lower surface of the arm portion 17c in order to provide a gap wh between the arm portion 17C and the valve body holding plate 6. However, as shown in FIG. 3, when the valve body holding plate 16 has an upwardly protruding convex portion 16b on the periphery of the assembly hole 16c into which the protrusion 17b of the valve body 17 is inserted, the annular groove 170 is Even if it is not provided, a predetermined distance ah can be provided between the arm portion 17c and the valve body holding plate 16,
The valve body 17 may be formed in this manner.

Further, in the first embodiment, the valve body 17 that operates when there is a negative pressure has been described, but as shown in the second embodiment shown in FIGS. may be applied.

The valve body 27 of the second embodiment is a substantially annular body made of the same material as the valve body 17 of the first embodiment, and includes a thick-walled cylindrical holding portion 27a extending in the vertical direction, and a cylindrical holding portion 27a extending from the upper and lower ends of the holding portion 27a. It is provided with arm portions 27b and 27c extending radially outward and inward, respectively, and an outer circumferential lip portion 27d and an inner circumferential lip portion 27e that protrude downward at the tips of each of the arm portions 27b and 27c. The valve body 27 is assembled and held by the valve body holding plate 26 by fitting the holding portion 27a into the stepped portion 26a of the substantially disc-shaped valve body holding plate 26.

Arm portions 27b and 27c in this valve body 27
are formed with annular grooves 27f and 27g so as to provide respective predetermined gaps with the valve body holding plate 26,
Further, annular recesses 27h and 27i are formed near the lip portions 27d and 27e at the tips, respectively, to form thin-walled portions 27j and 27k.

Note that the portion sealed by the outer circumferential lip portion 27d of the valve body 27 is a stepped portion 22a provided protruding from the inner circumferential surface of the cap body 22.
The portion sealed by the inner circumferential lip portion 27e is the valve plate 28 which is urged upward from the spring seat 22b below the step portion 22a via the coil spring 25B.

This valve body 27 is assembled and held by the valve body holding plate 26,
Inside the cap body 22, the fuel cap 21 is formed by sequentially assembling the coil spring 25B, the valve plate 28, the valve body holding plate 26 which has assembled and held the valve body 27, the coil spring 25A, the spring seat plate 29, etc. When used by tightening it to the specified filler neck 10, the arm part 2
Annular thin-walled portions 27j and 27k are provided near the lip portions 27d and 27e in 7b and 27c, respectively, and the first
The same effects as in the embodiment are achieved.

By the way, to describe the operation mode of the fuel cap 21 during positive pressure and negative pressure, when the inside of the fuel tank is under positive pressure, the valve body 2 resists the biasing force of the coil spring 25A.
7, the valve element holding plate 26 rises, and the outer circumferential lip part 27d of the valve element 27 separates from the cap main body stepped part 22a, creating a gap, which allows fluid such as air in the fuel tank to flow through the spring seat 22b. It flows out into the atmosphere from between the elastic finger 22e formed on the upper flange portion 22d of the cap body 22 and the upper i23 (see FIG. 6) through the passage hole 22c1 and the passage hole 29a of the spring seat plate 29. , the positive pressure inside the fuel tank is eliminated. Note that this elastic finger 22e is
The tightening torque of the fuel cap 21 is regulated in cooperation with the plurality of protrusions 23a protruding from the fuel cap 21.

In addition, when the inside of the fuel tank is under negative pressure, the coil spring 2
The valve plate 28 descends against the urging force of the valve body 2
7 is separated from the valve plate 28 and a gap is created there, allowing fluid such as air to flow from between the elastic finger 22e and the upper lid 23 to the spring seat plate 29.
Flow passage hole 29a5 of the valve body holding plate 26
Next, the valve body 37 of the third embodiment shown in FIGS. 7 and 8 will be explained.

The valve body 37 of this third embodiment is formed into a substantially umbrella shape from the same material as the valve body 17 of the first embodiment, and is held by the top plate portion 32a of the cap body 32.

The valve body 37 includes a holding part 37a that is fitted into an assembly hole 32b protruding from the center of the top plate part 32a and has a flow passage hole 37b in the center, and an arm part 37c that extends diagonally downward from the holding part 37a. and a lip portion 37d projecting inward around the entire circumference of the tip end of the arm portion 37c.

This lip portion 37. d has a valve plate 38 disposed facing the top plate part 32a of the cap body 32 holding the valve body 37 as a sealing part, and this valve plate 3
8 is formed to protrude upward in a hemispherical shape. This valve plate 38 is urged upward by a coil spring 35,
The lower end of the coil spring 35 is held by a spring holding plate 34 which is undercut and fixed by a plurality of ribs 32c protruding from the inner periphery of the cap body 32.

An annular recess 37f is formed in the arm portion 37c near the lip portion 37d, thereby forming a thin wall portion 37g.

Therefore, in this valve body 37, since the arm portion 37C extends obliquely downward from the holding portion 37a, the valve body 37
After the cap body 32 is attached to the top plate part 32a, which is a holding member, the lip part 37d of the arm part 37c is bent between the arm part 37c and the top plate part 32a, so that a tit h is formed during examination. Furthermore, an annular thin wall portion 37g is provided near the lip portion 37d, and the same effect as in the first embodiment is produced, and the valve body 37 may be configured in this manner. To explain how the fuel cap 31 operates, when the inside of the fuel tank reaches a negative pressure state exceeding a predetermined level, the valve plate 38 moves down against the biasing force of the coil spring 35, and the valve plate 38 moves from the lip portion 37d of the valve body 37 to the valve plate 38. 38 is separated and the flow passage hole 37b of the valve body 37 is opened, thereby eliminating the negative pressure state in the fuel tank via the flow passage hole 37b.

In addition, in the valve bodies 17, 27, and 37 of the first to third embodiments, in order to form the thin portions 17g, 27j, 27k, and 37g,
Although the arm parts 17c, 27b, 27c, and 37c are shown having recessed parts 17f, 27h, 27j, and 37f formed on the protruding side surfaces of the lip parts 17d, 27d, 27e, and 37d, it goes without saying that the arm parts 17c, 27b, and 27C・37C
The recess may be provided on the opposite side of the wafer, or the recess may be formed from both sides.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a valve body of a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a fuel cap in which the valve body of the first embodiment is used, and FIG. 4 is a sectional view of a fuel cap in which the valve body of the second embodiment is used, FIG. 5 is a sectional view of the valve body of the second embodiment, and FIG. 9 is a plan view of the fuel cap in which the valve body of the embodiment is used with the top cover removed; FIG. 7 is a sectional view of the fuel cap in which the valve body of the third embodiment is used;
FIG. 8 is a sectional view showing the valve body of the third embodiment. FIG. 9 is a cross-sectional view of a conventional valve body, and FIG. 10 is a cross-sectional view of a tube cap in which the conventional valve body is used. 2a, 22a, 28, 38... Seal part, 6, 16
・26・32... Holding member, 7.17.27.37.
... Valve body, 7a, 17a, 27a, 37a... Holding part, 7 c
・ 17 c ・ 27 b ・ 27 c ・ 37
c... Arm part, 7d, 17d, 27d-27e-37d... Lip part, 17g, 27j, 27k, 37g... Thin wall part. Patent application Toyoda Gosei Co., Ltd.

Claims (1)

[Claims] An arm portion extending substantially parallel to the holding member from a holding portion held by the holding member, and a lip portion protruding from the tip of the arm portion, disposed opposite to the holding member, and pressed against the sealing portion. A valve body comprising: a valve body in which the arm portion is disposed with a predetermined gap with respect to the holding member, wherein a thin wall portion is formed in the arm portion near the lip portion.