JPH1038149A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet having excellent sealing performance. SOLUTION: A grommet 1 is mounted on an attaching hole 3 formed on an attaching member 2. A cylindrical base part 4 and a side plate part 5 for blocking one cylindrical end side of the base part 4 are formed. A circumferential groove 6 to be mounted on the attaching hole 3 of the attaching member 2 is formed on the outer periphery of the base part 1. Moreover, an through hole 13 is formed on the side plate part 5 so as to be axially eccentric from the circumferential groove 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is preferably used for sealingly penetrating a tube, a harness, a protective tube and the like from inside a cover member for covering an electromagnetic valve and the like.

[0002]

2. Description of the Related Art A conventional grommet is disclosed in
As shown in Japanese Patent Publication No. 50286, a cylindrical body having a flange at one end, an outer peripheral surface is formed substantially straight, and the inner diameter of the through-hole is formed at the end where the flange is formed. It is formed to have substantially the same outer dimensions as the tube to be inserted, and has a smaller diameter at the opposite end than the tube.

The grommet is used by being attached to a mounting hole provided in a cover member, and a tube is inserted into the through hole. As a result, the gap between the mounting hole of the cover member and the tube is sealed by the grommet, and the tube is hermetically penetrated from inside the cover member.

That is, the through hole of the grommet is formed in a tapered shape, and the inner diameter of the through hole is smaller than the outer dimension of the tube at the end opposite to the end where the flange is formed. Therefore, when the grommet is attached to the mounting hole of the cover member and the tube is inserted into the through-hole, the inner diameter of the through-hole increases at the end opposite to the end at which the flange is formed, and The outer periphery is brought into close contact with the inner diameter of the mounting hole of the cover member. As a result, the space between the through hole of the grommet and the tube and the space between the outer periphery of the grommet and the mounting hole are sealed.

[0005]

However, in the conventional example, the through hole of the grommet is formed in a tapered shape, and the inner diameter of the through hole is formed at the end opposite to the end at which the flange is formed. By making the diameter smaller than the outer dimensions of the tube and inserting the tube into the through hole, the sealing action by the grommet is enhanced.

Accordingly, the sealing action depends on the outer dimensions of the tube, and if the dimensional difference between the tube and the through hole is increased, the sealing action is enhanced, but the work of inserting the tube into the through hole becomes difficult. There is a fear.

Further, since the through hole of the grommet is tapered, a uniform sealing action cannot be obtained in the entire axial direction of the grommet, and as a result, a sufficient sealing action may not be obtained.

[0008] The present invention has been devised in view of such a conventional situation, and has an object to provide a grommet having excellent sealing performance.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a grommet to be mounted in a mounting hole formed in a mounting member for mounting a grommet, wherein the grommet has a cylindrical base and a cylindrical one end of the base. A side plate portion formed so as to close the peripheral portion, a peripheral groove formed on the outer periphery of the base portion and attached to a mounting hole of the mounting member, and formed on the side plate portion so as to be offset from the peripheral groove in the axial direction. And a through hole provided.

According to a second aspect of the present invention, in the configuration of the first aspect, the bottom surface of the circumferential groove has the same dimension in the axial direction as the bottom surface of the peripheral groove matches the inner diameter shape of the mounting hole of the mounting member. Alternatively, it is configured to have a tapered shape.

The invention according to claim 3 is the same as the structure of the invention according to claim 1, except that a circumferential ridge is formed on the bottom surface of the circumferential groove.

The invention according to a fourth aspect of the present invention is the same as the first aspect of the invention, except that a handle is formed on the side plate portion.

The grommet having such a configuration is used in such a manner that a circumferential groove is mounted in a mounting hole of a mounting member, and a tube, a harness, a protection tube and the like are inserted into the through hole. That is, the grommet is a device used in a place where a tube, a harness, a protection tube, and the like penetrates through the mounting member, and various types of tubes, harnesses, protection tubes, and the like, which are not particularly limited, can be applied to the present invention.

At this time, since the through hole is formed not to have a tapered shape but to be deviated in the axial direction from the circumferential groove formed in the base portion, an insertion operation when inserting a tube or the like into this through hole is performed. It becomes easy, and since the outer dimensions of the peripheral groove are not changed by inserting the tube or the like, and the interference between the inner surface of the mounting hole and the bottom surface of the peripheral groove does not change, an excellent sealing action is obtained. It can be obtained stably.

Further, in the invention according to claim 2, since the bottom surface of the circumferential groove of the grommet is formed in a shape that matches the inner surface shape of the mounting hole, the inner surface of the mounting hole and the bottom surface of the circumferential groove are formed. The interference is uniform over the entire area in the axial direction, and an excellent sealing action is exhibited.

According to the third aspect of the present invention, the circumferential projections serve to further enhance the sealing action.

Further, in the invention described in claim 4, the handle facilitates the work of mounting the grommet in the mounting hole.

Accordingly, a grommet having excellent sealing performance can be obtained.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a grommet showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a grommet. The grommet 1 is made of a rubber material or a synthetic resin material. You.

The grommet 1 has a cylindrical base 4 and a cylindrical one end of the base 4, in this embodiment a side plate 5 formed so as to close the right end in FIG.
have.

On the outer periphery of the base 4, the mounting member 2
A peripheral groove 6 to be attached to the mounting hole 3 is formed. The bottom surface 7 of the peripheral groove 6 is formed in the same dimension or tapered shape in the axial direction in conformity with the inner surface shape of the mounting hole 3. That is, the mounting hole 3 is machined into an inner surface shape having the same dimension in the axial direction, and when applied to the mounting hole 3, the bottom surface 7 of the circumferential groove 6 matches the inner surface shape of the mounting hole 3. They are formed in the same dimension in the axial direction. On the other hand, the mounting hole 3
Is formed by casting, the inner surface of the mounting hole 3 is formed into a tapered shape by forming a so-called draft angle. Therefore, when the mounting hole 3 is applied to the mounting hole 3 having the tapered inner surface, the peripheral groove 6 is formed. Is formed in a tapered shape that matches the tapered inner surface shape of the mounting hole 3. by this,
The interference between the inner surface of the mounting hole 3 and the bottom surface 7 of the circumferential groove 6 becomes uniform in the entire axial direction, and exhibits an excellent sealing effect.

On the bottom surface of the circumferential groove 6, a circumferential ridge 8 is formed as shown in FIG. The protrusion 8 is formed in two lines in this embodiment,
Contacting the inner peripheral surface of the mounting hole 3 with a predetermined interference,
The sealing action between the inner surface of the mounting hole 3 and the bottom surface 7 of the circumferential groove 6 is further strengthened.

The flanges 11 and 12 forming the side surfaces 9 and 10 of the peripheral groove 6 are in contact with the side surfaces of the mounting member 2 near the peripheral edge of the mounting hole 3, respectively, and the grommet 1 mounted on the mounting hole 3 by the peripheral groove 6 is provided. And prevents sealing, and exerts a sealing effect.

Reference numeral 13 denotes a through hole formed in the side plate portion 5,
A tube 14 such as a harness can be inserted into the through hole 13. The through hole 13 is formed in the peripheral groove 6 formed in the base 4.
1 in this embodiment, and FIG.
Is formed at a position deviated to the right. More specifically, the through hole 13 is provided with a projection 15 extending diagonally downward and rightward on the side plate portion 5, and formed through the projection 15.

Counterbore portions 16 and 17 are formed at both ends of the opening of the through hole 13. The counterbore 16, 17 facilitate the insertion of the tube 14 and, in particular, the counterbore 1
7 prevents the intrusion of muddy water or the like through the through hole 13 by forming the obliquely downward flange 18. In addition, the inner surface of the through hole 13 has two circumferential ridges 1.
9, the inner surface of the through hole 13 and the tube 14
Enhances the sealing action between.

Reference numeral 20 denotes a handle formed to protrude from the side plate portion 5, and this handle 20 corresponds to FIG.
And the grommet 1 is attached to the mounting member 2
Mounting work when mounting in the mounting hole 3 is easy.

The work of mounting the grommet 1 in the mounting hole 3 is performed as follows. That is, grommet 1 is
A tube 14 such as a harness of an electromagnetic valve is inserted into the through hole 13 by being located inside (on the left side in FIG. 1) an attaching member 2 such as a cover member that covers an electromagnetic valve and the like (not shown). In this case, the tube 14 is inserted from the side where the counterbore 16 is formed. Next, make the grommet 1 face the mounting hole 3,
The end of the tube 14, the protrusion 15, and the handle 20 inserted into the through hole 13 are outside the mounting member 2 (right side in FIG. 1).
Position. In this state, the circumferential groove 6 is inside the mounting member 2 (left side in FIG. 1) because the flange 12 is formed. Next, the grommet 11 is pulled to the outside of the mounting member 2 (the right side in FIG. 1) using the handle 20, and the circumferential groove 6 is mounted in the mounting hole 3. In this case,
The mounting operation can be performed easily by the handle 20, and the flange 11 functions as a stopper, so that the peripheral groove 6 is correctly mounted in the mounting hole 3.

As a result, the through-hole 13 is formed not to have a tapered shape but to be deviated in the axial direction from the circumferential groove 6 formed in the base 4, so that the tube 14 such as a harness is inserted into the through-hole 13. The insertion work at the time of insertion becomes easy, and the outer dimension of the peripheral groove 6 changes by inserting the tube 14, so that the interference between the inner surface of the mounting hole 3 and the bottom surface 7 of the peripheral groove 6 changes. Therefore, an excellent sealing action can be stably obtained.

Since the bottom surface 7 of the circumferential groove 6 of the grommet 11 is formed in a shape that matches the inner surface shape of the mounting hole 3, the interference between the inner surface of the mounting hole 3 and the bottom surface 7 of the circumferential groove 6 is provided. Is uniform over the entire area in the axial direction, and exhibits excellent sealing action.

Therefore, a grommet having excellent sealing performance can be obtained.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the spirit of the invention.
For example, the tube 14 may be inserted into the through hole 13 after attaching the grommet 11 to the attachment hole 3.

[0033]

As described in detail above, according to the present invention, a grommet having excellent sealing performance can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a grommet showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a circumferential groove of a grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 Mounting member 3 Mounting hole 4 Base 5 Side plate 6 Peripheral groove 13 Through hole

Claims (4)

[Claims] 1. A grommet to be mounted in a mounting hole formed in a mounting member for mounting a grommet, a cylindrical base, a side plate formed so as to close one cylindrical end of the base, and the base. A peripheral groove formed in the outer periphery of the mounting member and mounted in the mounting hole of the mounting member; and a through hole formed in the side plate portion so as to be deviated in the axial direction from the peripheral groove. Grommet to do. 2. The grommet according to claim 1, wherein a bottom surface of the peripheral groove is formed to have the same dimension or a tapered shape in an axial direction so as to match an inner surface shape of a mounting hole of the mounting member. 3. The grommet according to claim 1, wherein a circumferential ridge is formed on a bottom surface of the circumferential groove. 4. The grommet according to claim 1, wherein a handle is formed on the side plate portion.