JP3383854B2 - gasket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket which is fitted in a mounting hole formed in a container and into which a member to be mounted is press-fitted to be used as an interposition member for mounting the member to be mounted in the container.

Here, an example will be described in which the fuel cutoff valve (attached member) is attached to the valve attaching hole of the fuel tank (container), but the present invention is not limited to this.

The upper and lower sides of the gasket are based on when they are fitted into the horizontal mounting holes formed on the upper surface of the container, but when the gasket is fitted into the mounting holes formed on the side and lower surfaces of the container, Naturally, the vertical positional relationship changes.

[0004]

2. Description of the Related Art As a gasket of the above type, there is, for example, the one having the following structure in Japanese Utility Model Laid-Open No. 60-112767 (see FIG. 1).

The gasket 11 is fitted in a valve mounting hole 15 formed in the fuel tank 13, and a fuel cutoff valve (hereinafter simply referred to as "valve") 17 is press-fitted inside the gasket 11 so that the valve 17 is filled with fuel. Tank 13
Used as an inclusion to attach to.

The basic structure of the gasket 11 is a cylindrical portion 21 fitted into a gasket fitting groove 19 formed in the outer peripheral portion of the valve 17, that is, a valve case 18, and formed on the outer periphery of the cylindrical portion 21. In addition, the upper lip portion 23 and the lower lip portion 25 that sandwich the mounting hole peripheral portion 14 are provided.

Then, the valve 17 is normally attached through the gasket 11 by inserting the gasket 11 into the valve attachment hole 15 and then press-fitting the valve case 18. At this time, the inner periphery of the gasket 11 is in pressure contact with the outer periphery of the valve case 18, so that the groove bottom portion of the sandwiching groove 26 formed by the upper lip portion 23 and the lower lip portion 25 is in pressure contact with the mounting hole peripheral portion 14. This seals between the valve 17 and the peripheral portion 14 of the mounting hole. In the figure, 2
7 is a float, 29 is a movable piece, and 30 is a stop flange when the valve case is press-fitted.

[0008]

At this time, in the case of the gasket having the above construction, the press-fitting load of the valve case is small,
Moreover, there is a requirement for bivalent (ambivalent) physical properties that the pull-out load is large.

When mounting the valve, it is necessary to consider the sheet metal press tolerance of the valve mounting hole and the cumulative tolerance such as the valve case / gasket molding tolerance.

For this reason, it is difficult to satisfy the above physical property requirements, and a float valve device (fuel cut-off valve) having a valve case drop-off prevention mechanism having the following structure that does not require consideration of the withdrawal load has been proposed.

"A mounting member for a float valve case which is moved up and down in response to a shake of a vehicle body or the like to open and close a breathing passage, and extends radially outward from the float valve case to be fixed to a fixed system of the vehicle body or the like. Is integrally formed, and a claw portion which is fitted into the fixing system to regulate the drop is formed on the mounting member. "However, an extra member for forming the drop prevention mechanism is formed. It requires man-hours and makes it difficult to robotize valve mounting.

In view of the above, the present invention makes it possible to increase the pull-out load without increasing the press-fitting load of the member to be attached, and thus to reduce the necessity of attaching a fall-out preventing mechanism for the member to be attached. The purpose is to provide.

[0013]

The gasket of the present invention comprises:
The above problem is solved by the following configuration.

A gasket which is fitted into a mounting hole formed in a container and into which a member to be mounted is press-fitted, and which is used as an interposition member for mounting the member to be mounted in a container, the gasket being mounted on the outer peripheral portion of the member to be mounted. A tubular part that fits in the formed gasket fitting groove, and a gasket that has an upper lip part and a lower lip part that are formed on the outer periphery of the tubular part and that sandwich the peripheral edge of the mounting hole. The inner peripheral portion of the lower end of the is notched, and an engaging recess is formed so as to be fitted and engaged with the lower step of the gasket fitting groove.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. The same parts as those in the above-described example are designated by the same reference numerals, and the description thereof will be omitted in whole or in part.

(1) The gasket 111 of this embodiment has a tubular portion 121 fitted to the gasket fitting groove 19 formed in the outer peripheral portion of the valve 17, that is, the valve case 18, and the tubular portion 121. It has a prerequisite structure including an upper lip portion 123 and a lower lip portion 125 that are formed on the outer periphery and sandwich the attachment hole peripheral portion 14.

This gasket is usually made of synthetic rubber having good oil resistance such as NBR and manufactured by injection molding or transfer molding.

(2) In this embodiment, the inner peripheral portion of the lower end of the tubular portion 121 is cut out, and the engaging concave portion 122 is formed so as to be fitted and engaged with the lower step portion 20 of the gasket fitting groove 19. Has been formed.

Due to the existence of the engaging recess 122, when a load in the pulling direction is applied to the valve case 18, the horizontal step 124 of the engaging recess 122 engages with the lower step 20 of the gasket fitting groove 19. Then, the force to rotate the gasket 111 upward with the mounting hole peripheral portion 14 as a fulcrum, that is,
Although a reversing moment is generated, the inner peripheral surface (vertical surface) of the engaging recess 122 abuts the outer peripheral surface of the lower step portion 20 of the gasket fitting groove 19 to prevent the reversing moment. Therefore, the pull-out load of the valve case increases.

Further, the valve case 18 is attached to the gasket 11
A feeling of fitting (fitting feeling) at the time of press fitting into 1 is obtained, which contributes to improvement of fitting workability.

The height and depth of the engaging recess 122 are usually 2 to 5 mm, respectively. That is, the engaging recess 1
The gap between the inner peripheral surface (vertical surface) of 22 and the outer peripheral surface of the lower step portion 20 of the gasket fitting groove 19 is preferably as small as possible without impairing the fitting property, and is usually 1 mm. Within If it exceeds 1 mm, it becomes difficult to exert the above-mentioned reversal moment blocking effect.

Further, in this embodiment, the height position of the outer peripheral lower end 125a of the lower lip portion 125 is the same as or higher than the notch height position of the engaging recess 122, that is, the height position of the horizontal step portion 124. It is in the down position. With this configuration, the lower portion of the tubular portion 121 becomes relatively thick, and the valve case 18
When a force in the pulling direction acts on the gasket 111 and a reversal moment is generated in the gasket 111, the inner peripheral surface (vertical surface) of the engaging recess 122 is applied to the outer peripheral surface of the lower step portion 20 of the gasket fitting groove 19 with a larger force. The contact can be expected, the blocking force of the reversal moment increases, and the increase in the withdrawal load of the valve case 18 can be more reliably ensured.

In the illustrated example, the height h of the tubular portion 121 of the gasket is formed larger than the height H of the gasket fitting groove 19 of the valve case 18 in order to secure the lower wall thickness of the tubular portion. However, the reverse, that is, H may be formed larger than h.

In the illustrated example, the lower lip portion 125 is inclined from the outer peripheral lower end 125a toward the lower end of the cylindrical portion 121, but may be horizontal.

(3) The usage of the gasket of this embodiment is as follows.
This is similar to the case of the conventional example described above.

[0026]

The operation and effect of the invention The gasket of the present invention has the following operation and effect due to the above-mentioned constitution.

(1) A member to be attached is formed by notching the inner peripheral portion of the lower end of the tubular portion of the gasket and forming an engaging recess so as to be fitted and engaged with the lower step of the gasket fitting groove. When removing (attempting to remove) the (valve, etc.) from the gasket fitted in the container (fuel tank, etc.), the gasket rotates upward with the peripheral edge of the mounting hole as a fulcrum, that is, an inversion moment is generated. However, the inner peripheral surface (vertical surface) of the engaging recess
Comes into contact with the outer peripheral surface of the lower step portion of the gasket fitting groove to prevent the reversal moment. Therefore, the detachment load of the attached member increases.

On the other hand, the press-fitting load of the member to be attached to the gasket is almost unchanged because the inner diameter of the tubular portion of the gasket is not changed.

Further, the lower step of the gasket fitting groove fits into the engaging recess when the member to be mounted is press-fitted, the fit feeling (fitting feeling) is increased, and the workability of mounting the mounted member is improved. Be improved.

(2) Further, as described in claim 2, since the outer peripheral lower end height position of the lower lip portion is the same as or lower than the step height position of the engaging concave portion, The lower side of the groove is relatively thick, and it can be expected that the inner peripheral surface (vertical surface) of the engaging recess will come into contact with the outer peripheral surface of the lower step portion of the gasket fitting groove with a greater force, preventing the reversal moment. The force increases, and the increase in the withdrawal load of the valve case can be more reliably ensured.

(3) By the way, the gasket of this embodiment having the dimensions shown in FIG. 4 is installed in the fuel tank mounting hole (inner diameter φ41.2 m).
After fitting in (m), a valve case (fitting groove: height 12 mm x outer diameter 31.4 mm) was press-fitted, and the drop load of the valve case was measured. On the other hand, in FIG. 4, on the other hand, the pull-out load was measured under the same conditions for the conventional gasket (comparative example) in which the lower hatch portion of the gasket was removed.

In the comparative example, it was 469 N, whereas in this example, it was 594 N, and the pull-out load increased by 27%.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional gasket mounting mode.

FIG. 2 is a partial cross-sectional view of a mounting state of the gasket of this embodiment (omitted in the case)

FIG. 3 is an explanatory view of the action when the pulling force acts on the valve case in FIG.

[Fig. 4] Dimensional cross-sectional view of gasket used for pull-out load test

[Explanation of symbols]

11,111 gasket 13 Fuel tank (container) 14 Mounting hole periphery 15 (Valve) mounting hole 17 Fuel cutoff valve (attached member) 19 Gasket fitting groove 20 Lower step of gasket fitting groove 21, 121 Gasket tubular part 122 engagement recess 124 Horizontal step of engaging recess 23, 123 Upper lip 25, 125 lower lip

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Fujita 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (56) References (JP, U) Actual development Sho 53-101974 (JP, U) Actual development Sho 60-77754 (JP, U) Actual development Sho 61-57268 (JP, U) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) F16J 15/10

Claims (2)

(57) [Claims] 1. A gasket which is fitted into a mounting hole formed in a container and into which a member to be mounted is press-fitted, and which is used as an inclusion for mounting the member to be mounted to the container, the member being mounted. In a gasket having a tubular portion fitted in a gasket fitting groove formed on the outer peripheral portion of the, and an upper lip portion and a lower lip portion formed on the outer periphery of the tubular portion for holding the peripheral edge portion of the mounting hole. , the tubular lower end inner circumferential portion of the shaped portion is notched in engagement recesses formed, the omission direction load of the mounted member by the action of an
When the horizontal step portion of the engaging recess is fitted and engaged with the lower step portion of the gasket fitting groove, the inner peripheral surface of the engaging recess is
A gasket configured to come into contact with an outer peripheral surface of a lower step portion of the gasket fitting groove . 2. The outer peripheral lower end height position of the lower lip portion is the same as or lower than the notch height position of the engaging recessed portion according to claim 1, and the lower side portion of the tubular portion is phase
Gasket characterized that you have been paired to thick.