JPH06692Y2 - Plug tube casket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Purpose of the Invention [Industrial field of application] The present invention relates to a plug tube gasket, and more particularly to a seal ring abutting around the inner opening of a through hole formed in a cylinder head cover. A plug tube gasket in which a plurality of beads are formed on the contact surface of the outer seal portion and the sealing area of the outer seal portion with respect to the cylinder head cover is secured even when the distance between the plug tube and the cylinder head cover changes. It is a thing.

[Prior Art] Conventionally, as a plug tube gasket of this type, a through hole 21 formed in a cylinder head cover 20 like a plug tube gasket 10 shown in FIGS. 3 and 4 (a) and (b), for example. It has been proposed that the contact surface of the outer seal portion 11A of the seal ring 11 is brought into contact with the periphery 22 of the inner opening.

[Problems to be Solved] However, in the conventional plug tube gasket 10 , since the contact surface of the outer seal portion 11A of the seal ring 11 is formed by a smooth surface, () the cylinder head cover 20 is an end surface of the plug tube 30 . When it is brought too close to, the outer seal portion 11A of the seal ring 11 is excessively pressed, and the contact area (that is, the seal area) with respect to the cylinder head cover 20 is, for example, the fourth.
There is a drawback that it is significantly reduced from "C" in FIG. 4 (a) to "D" in FIG. 4 (b). As a result, with respect to the inner opening periphery 22 of the through-hole 21 formed in the cylinder head cover 20 , There is a drawback in that the seal between the cylinder head cover 20 and the plug tube 30 cannot be ensured due to damage or loss that occurs during manufacturing.

Therefore, the present invention provides a plug tube gasket in which a plurality of beads are formed on the contact surface of the outer seal portion of the seal ring in order to eliminate these drawbacks.

(2) Configuration of the Invention [Means for Solving the Problem] The means for solving the problem provided by the present invention is, “The inner seal portion abutting on the outer peripheral surface of the distal end portion of the plug tube and the penetrating hole formed on the cylinder head cover. In a plug tube gasket that has an outer seal portion that abuts around the inner opening of the hole, and that secures a seal between the cylinder head cover and the plug tube, abuts the outer seal portion that abuts the cylinder head cover. A plurality of beads are formed on the surface, and the sealing area of the outer sealing portion with respect to the cylinder head cover is secured even when the distance between the end surface of the plug tube and the cylinder head cover changes. Gasket "[Operation] The plug tube gasket according to the present invention is the outer periphery of the tip of the plug tube. A plug tube that secures a seal between the cylinder head cover and the plug tube, and an outer seal portion that abuts around the inner opening of a through hole formed in the cylinder head cover. In the gasket, a plurality of beads are formed on the contact surface of the outer seal part that contacts the cylinder head cover, and even when the distance between the end surface of the plug tube and the cylinder head cover changes, the outer seal for the cylinder head cover Since the seal area of the cylinder head cover is secured, even if the distance between the () plug tube and the cylinder head cover is changed, it has the effect of ensuring a sufficient seal area for the cylinder head cover. () Assembly error between plug tube and cylinder head cover An action to eliminate the seal errors due to accompanying position deviation.

[Embodiment] Next, the plug tube gasket according to the present invention will be specifically described with reference to its preferred embodiments. However, the embodiments described below are described for facilitating or facilitating the understanding of the present invention, and not for limiting the present invention. In other words, each member disclosed in the embodiments described below includes all design changes and equivalent replacements within the spirit and technical scope of the present invention.

FIG. 1 is a sectional view showing an embodiment of a plug tube gasket according to the present invention.

FIG. 2 (a) is a cross-sectional view for explaining the operation of the embodiment of FIG. 1, and shows the center line XX of the through hole 21 of the cylinder head cover 20 and the center line YY of the plug tube 30. 2A and 2B do not match, and the distance between the inner opening periphery 22 of the through hole 21 formed in the cylinder head cover 20 and the end surface of the plug tube 30 is in a suitable state.

FIG. 2B is another sectional view for explaining the operation of the embodiment shown in FIG. 1, and is a through hole 21 of the cylinder head cover 20.
The center line X-X of the plug tube 30 and the center line Y-Y of the plug tube 30 do not match, and the inner periphery 22 of the through hole 21 formed in the cylinder head cover 20 and the plug tube.
It shows a case where the distance from the end face of 30 is reduced as compared with the optimum distance in FIG. 2 (a).

First, referring to FIGS. 1 and 2 (a) and (b), an embodiment of a plug tube gasket according to the present invention will be described.
The configuration will be described in detail. 10 is a plug tube gasket according to the present invention, the outer peripheral surface of the outer seal portion 11A and the plug tube 30 abut against the inner opening periphery 22 of the through-hole 21 formed in the cylinder head cover 20 A cylindrical seal ring 11 having inner seal portions 11B to be abutted at both ends and formed of an appropriate elastic material (eg, rubber), and a seal ring surrounding the inner seal portion 11B. It has a tubular reinforcing ring 12 disposed inside 11 and formed of an appropriate material such as metal.

The reinforcing ring 12 is curved so that one end thereof is exposed to the inner peripheral surface of the seal ring 11, and the reinforcing ring 12 is arranged so that the opening periphery of the exposed one end is brought into contact with the end surface of the plug tube 30. There is.

A plurality of beads 11a are formed on the outer seal portion 11A of the seal ring 11 so as to extend in the circumferential direction with respect to a surface (also referred to as “contact surface”) that contacts the cylinder head cover 20 . Further, in the inner seal portion 11B of the seal ring 11, at least one bead 11b is formed so as to extend in the circumferential direction in order to ensure a seal with the outer peripheral surface of the plug tube 30 .

Further, referring to FIGS. 1 and 2 (a) and (b), an embodiment of a plug tube gasket according to the present invention will be described.
The operation will be described in detail.

The plug tube gasket 10 according to the present invention is first installed on the end portion of the plug tube 30 . That is, the inner seal portion 11B is arranged so as to contact the outer peripheral surface of the plug tube 30 .

After that, the cylinder head cover 20 is attached to the cylinder head (not shown), so that the inner opening periphery 22 of the through hole 21 becomes the outer seal portion 11A of the seal ring 11.
Is abutted against.

When the cylinder head cover 20 is located at a suitable distance from the end surface of the plug tube 30 , the outer seal portion
Several beads 11a formed at the tip of 11A are in contact with the inner surface of the cylinder head cover 20 to secure a sufficient seal width and thus a seal area A (second).
(See Figure (a)). On the other hand, when the cylinder head cover 20 is brought close to the end surface of the plug tube 30 , some beads 11a formed in the middle portion of the outer seal portion 11A are brought into contact with the inner surface of the cylinder head cover 20. As a result, a sufficient seal width and thus a seal area B (A) are still secured (see FIG. 2 (b)).

Therefore, according to the plug tube gasket 10 of the present invention , even if the distance between the plug tube 30 and the cylinder head cover 20 changes, the sealing area of the outer seal portion 11A with respect to the cylinder head cover 20 can be sufficiently secured.

(3) Effect of the Invention As is apparent from the above, the plug tube gasket according to the present invention has the inner seal portion that abuts the outer peripheral surface of the tip end of the plug tube and the inner opening periphery of the through hole formed in the cylinder head cover. A plug tube gasket that secures a seal between the cylinder head cover and the plug tube, and a plurality of outer seal parts that contact the cylinder head cover. Since the bead is formed, the sealing area of the outer seal portion with respect to the cylinder head cover is secured even when the distance between the end surface of the plug tube and the cylinder head cover changes. Even if the distance between the cylinder head cover and the Has the effect of the sealing area can be sufficiently ensured that has the effect of turn () can be solved sealing errors caused by the accompanying position deviation such as assembling error between the plug tube and the cylinder head cover.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a plug tube gasket according to the present invention, FIGS. 2 (a) and 2 (b) are sectional views for explaining the operation of the embodiment of FIG. 1, and FIG. 4 (a) and 4 (b) are cross-sectional views for explaining the operation of the conventional example of FIG. 10 …… Plug tube gasket 11 …… Seal ring 11A …… Outer seal part 11a …… Bead 11B …… Inner seal part 11b …… Bead 12 …… Reinforcement ring 20 …… Cylinder head cover 21 …… Through hole 22 …… Inside Around opening 30 …… Plug tube

Claims (1)

[Scope of utility model registration request] 1. A cylinder head cover, comprising an inner seal portion abutting on an outer peripheral surface of a tip portion of a plug tube and an outer seal portion abutting around an inner opening of a through hole formed in a cylinder head cover. In the plug tube gasket that secures the seal with the plug tube, a plurality of beads are formed on the contact surface of the outer seal portion that contacts the cylinder head cover, and between the end surface of the plug tube and the cylinder head cover. A plug tube gasket characterized in that the sealing area of the outer sealing portion with respect to the cylinder head cover is secured even when the distance changes.