JPH1012355A - Rain cover for plug cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and certainly present water entry into a plug hole from an air evacuation pore. SOLUTION: A protrusion portion 38 is formed at a top end of an engagement portion 31. An air evacuation pore 36 formed on this protrusion portion 38 penetrates the engagement portion 31 along an axial line of a plug hole 2. Thus, the inside and outside of the plug hole 2 are communicated with each other via the air evacuation pore 36. An thin eve portion 34b having its flexibility extending upwardly of an outside opening 36a of the air evacuation pore 36 is inclined more downwardly than a radial direction outside of the axial line of the plug hole and extends. Therefore, if a rain cover 30 for a plug cap is subjected to water with a high pressure from a side of a head portion 34, the plate-shaped eve portion 34b is deformed so as to cover the outside opening 36a of the air evacuation pore 36 as a valve. Hence, even if the rain cover 30 for the plug cap is subjected to water with a high pressure by means of high-pressure car washing or the like, direct water entry or water entry due to detouring to the air evacuation pore 36 can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug cap rain cover which is attached to a plug hole formed in an engine head of an automobile engine or the like to prevent water droplets from entering the plug hole.

[0002]

2. Description of the Related Art A conventional rain cover for a plug cap is disclosed, for example, in Japanese Utility Model Laid-Open No. 7-25597. As shown in FIG. 11, the rain cover 3 is attached to an upper part of a plug cap body 4 housed in a plug hole 2 formed in the engine head 1 so as to close an opening edge of the plug hole 2. It is configured. That is, the rain cover 3 includes a substantially cylindrical fitting portion 31 and a head portion 34 integrally connected to an upper side of the fitting portion 31.
When inserted so as to fit into the upper part of the plug hole 2, the outer periphery thereof is in close contact with the inner surface of the upper end portion of the plug hole 2, and the inside and outside of the plug hole 2 are hermetically sealed. In the rain cover 3, an air vent hole 36 is formed from the fitting portion 31 to the head portion 34. The air vent hole 36 allows the inner space of the plug hole 2 to communicate with the outside air in a state where the fitting portion 31 is fitted in the plug hole 2 in an airtight manner, and the sealed plug hole 2
It serves to discharge the heated air inside the plug hole 2. A projecting portion 32 extending horizontally from the head portion 34 is opposed to an upper portion of the opening outside the air vent hole 36 in order to prevent water droplets from entering the plug hole 2 from the outside opening of the air vent hole 36. It is provided.

[0003]

However, in the rain cover 3 as shown in FIG. 11, the protrusion 32 and the air vent hole 3 are not provided.
6, the rain cover 3 cannot be effectively prevented from entering the air vent hole 36 when the rain cover 3 is wet with high pressure. There is a problem that the waterproofing of the mounting hole 2 cannot be sufficiently achieved.

Accordingly, the present invention provides a plug cap rain cover which can easily and reliably prevent water from entering the plug hole from the air vent hole even when high pressure water is applied. With the goal.

[0005]

In order to solve the above problems, a rain cover for a plug cap according to the first aspect of the present invention has a substantially cylindrical shape which is removably and airtightly fitted into a plug hole formed in an engine head. And a head portion that is integrally connected to the upper side of the fitting portion and pulls out the ignition cable inserted through the fitting portion to the outside of the engine head, from the fitting portion to the head portion. A plug cover rain cover formed and provided with an air vent hole for communicating the space inside the plug hole with the outside air in a state where the fitting portion is fitted in the plug hole in an airtight manner; A thin and flexible eaves portion is extended from the head portion so as to cover an upper portion of the opening communicating with the head portion.

In the rain cover for a plug cap according to a second aspect of the present invention, the eave portion extends downward in a radially outward direction with respect to an axis of the fitting portion.

According to a third aspect of the present invention, the eave portion extends substantially horizontally outward in the radial direction with respect to the axis of the fitting portion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

<< 1st Embodiment >> Hereinafter, the rain cover for plug caps of 1st Embodiment which concerns on this invention is demonstrated in detail, referring FIGS. 1-5.

As shown in FIGS. 1 to 5, the plug cap rain cover 30 of the first embodiment is formed of an elastic material, and fits over the plug hole 2 formed in the engine head 1. Substantially cylindrical fitting portion 31
And a head portion 34 for integrally pulling out the ignition cable 21 connected to the upper side of the fitting portion 31 and extending from the ignition plug attached to the bottom of the plug hole 2 to the outside of the engine head 1 through the fitting portion 31. And

As shown in FIG. 3, which is a cross-sectional view taken along the line AA of FIG. 1, a hole 31a extending in the axial direction is formed at the center of the fitting portion 31, and the hole 31a is formed in the hole 31a. The upper end of the plug cap body is fitted. The fitting portion 31 has an annular seal portion 31b
Are formed so as to bulge outward, and the sealing portion 31b
Presses against the inner surface of the upper end of the plug hole 2 to hermetically seal the inside of the plug hole 2.

Further, an annular skirt portion 33 is formed around an upper end portion of the fitting portion 31 and near a head portion 34. As shown in FIG. 4, when the fitting portion 31 is fitted to the upper part of the plug hole 2, the skirt portion 33 forms the annular flange portion 11 projecting above the opening edge of the plug hole 2. Cover from above, plug hole 2
More complete sealing.

The head part 34 has a hole 31 of the fitting part 31.
a cable guide hole 34a communicating with the ignition cable 21 is inserted into the fitting portion 31 through the plug body.
Is drawn out of the plug hole 2 via the cable guide hole 34a.

The fitting portion 31 is located at the side of the head portion 34.
A protrusion 38 extending upward from the upper end of the fitting portion 31 is integrally formed.
One air vent 36 (FIG. 4) extending parallel to the axial direction is formed. The air vent hole 36 is used to allow the space inside the plug hole 2 to communicate with the outside air when the fitting portion 31 is fitted to the upper end of the plug hole 2 in an airtight manner. It has a role of discharging the expanded air to the outside air side.

The air vent hole 3 is located above the protrusion 38.
An eaves portion 34b covering the outer opening 36a of the sixth from above is integrally formed so as to extend from the head portion 34.
The eaves portion 34 b is inclined downward toward the outside in the radial direction with respect to the axis of the fitting portion 31. Further, the eaves portion 34b is thin and flexible, and when the rain cover 30 is wet with high pressure from the head portion 34 side, the eaves portion 34b is deformed as shown by a dashed line in FIG. , Eaves part 3
The tip of 4b is configured to move downward and behave like a valve almost in close contact with the outer opening 36a of the air vent hole 36.

Since the rain cover 30 of this embodiment is configured as described above, even if high pressure water is applied to the rain cover 30 by a high-pressure car wash or the like, the eaves portion 3 is not covered.
The outer opening 36a of the air vent hole 36 is covered by the deformation of the air vent hole 36, so that water can be effectively prevented from entering the air vent hole 36 directly or by wraparound.
Can be easily and reliably achieved waterproofing. Thereby, it is possible to effectively prevent the engine from malfunctioning due to water entering the plug hole 2. At this time, the eaves portion 34b
Is inclined downward with respect to the radial outside, not only when the plug cap rain cover 30 is wet from the upper side along the axis of the plug hole 2, but also substantially perpendicular to the axis of the plug hole 2. Even when water is applied from the lateral direction, it is possible to effectively prevent water from entering the plug hole 2.

Second Embodiment A plug cover rain cover according to a second embodiment of the present invention will be described below with reference to FIGS. The plug cap rain cover according to the second embodiment is a modification of the plug cap rain cover according to the first embodiment.

As is clear from the plan and side views shown in FIGS. 6 and 7, the plug cap rain cover 130 of the second embodiment is compared with the plug cap rain cover 30 of the first embodiment. The difference is that the eave portion 134b is not provided with an inclination.

FIG. 8 is a sectional view taken along the line BB of FIG.
The eaves portion 134b is shown enlarged. As shown, the eaves 134b extend substantially horizontally outward in the radial direction with respect to the axis of the cylindrical fitting portion 31. Therefore, when the rain cover 30 is wet with high water pressure from the upper side, the thin and flexible eaves portion 134b is deformed so as to bend downward and the outer opening 34 of the air vent hole 36 is formed like a valve. (See the dashed line in FIG. 9). Therefore, the rain cover 30
Even when high-pressure water is splashed by a high-pressure car wash or the like, it is possible to effectively prevent water from directly or sneaking into the air vent hole 36 and easily and reliably achieve waterproofing of the plug hole. .

Third Embodiment A plug cover rain cover according to a third embodiment of the present invention will be described below with reference to FIG.

The plug cap rain cover 230 of the third embodiment is a modification of the plug cap rain cover of the first embodiment, and is different from the plug cap rain cover 2 of the first embodiment.
30, the root portion of the eaves portion 234b, that is, the head portion 34
A groove 80 is provided in the vicinity of the connection between the ridge and the eaves 234b. Such a groove portion 80 may be provided only on the lower surface of the root portion of the eaves portion 234b as shown in FIG. 10A, and as shown in FIG. May be provided on the upper and lower surfaces of the root portion of. In this manner, by providing the groove 80 at the root of the eaves 234b, the eaves 234b can be easily bent at the root, and the reliability of the waterproofing of the plug hole can be increased.

[0021]

As described above, according to the plug cap rain cover of the first aspect, the thin and flexible eaves cover the upper side of the opening of the air vent hole on the side communicating with the outside air. Since the portion extends from the head portion, when the plug cap rain cover receives high-pressure water of a predetermined value or more from the head portion side, the flexible eaves portion is deformed to release air. The opening outside the plug hole of the hole can be covered, water can be effectively prevented from entering from the air vent hole, and the waterproofing of the plug hole can be easily and reliably achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a plug cap rain cover of a first embodiment.

FIG. 2 is a side view of the rain cover of FIG. 1;

FIG. 3 is a view AA of the rain cover for the plug cap of FIG. 1;
It is arrow sectional drawing.

FIG. 4 is a BB of the rain cover for the plug cap of FIG. 1;
FIG.

FIG. 5 is a diagram illustrating deformation of an eaves portion.

FIG. 6 is a plan view showing a plug cap rain cover of a second embodiment.

FIG. 7 is a side view of the plug cap rain cover of FIG. 5;

FIG. 8 is a BB of the plug cap rain cover of FIG. 5;
FIG.

FIG. 9 is a diagram illustrating deformation of an eaves portion.

FIG. 10 is a plan view illustrating a main part of a plug cap rain cover according to a third embodiment.

FIG. 11 is a view for explaining the structure of a conventional plug cap rain cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine head 2 Plug hole 21 Ignition cable 30 Rain cover for plug cap 31 Fitting part 34 Head part 34b Eave part 36 Air vent hole

Claims (3)

[Claims] 1. A substantially cylindrical fitting portion which is removably and airtightly fitted into a plug hole formed in an engine head, and said fitting portion is integrally connected to an upper side of the fitting portion. A head portion for pulling out the ignition cable inserted through the joint portion out of the engine head, and a head portion formed from the fitting portion to the head portion, wherein the fitting portion is fitted in the plug hole in an airtight manner. In a plug cap rain cover provided with an air vent hole communicating the space inside the plug hole and the outside air, a thin and flexible eave portion so as to cover above an opening of the air vent hole on the side communicating with the outside air. And a plug cover extending from the head portion. 2. The plug cap rain cover according to claim 1, wherein the eave portion extends downward in a radially outward direction with respect to an axis of the fitting portion. 3. The plug cap rain cover according to claim 1, wherein the eaves portion extends substantially horizontally outward in a radial direction with respect to an axis of the fitting portion.