JPH11288630A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve shielding performance by arranging the side surface of a lead wire inserting hole in a bellows shape, and arranging the outer peripheral projecting part on the radial directional outer peripheral surface of a void formed between a lead wire and the side surface of the lead wire inserting hole in a lead wire-inserted state. SOLUTION: A grommet 1 prevents an entrance of foreign matter to the inside by bringing an inner peripheral part (the abutting parts 6) of a lead wire inserting hole 3 arranged in the grommet 1 into close contact with the outer periphery of a lead wire 2. The grommet 1 is installed on a solenoid by performing molding after inserting the lead wire 2. The side surface of the lead wire inserting hole 3 is arranged in a bellows shape, and when the lead wire 2 is inserted, the abutting parts 6 of plural places abut to the lead wire 2 by leaving a space to the side surface of the lead wire inserting hole 3 to form a sealed void 7, so that the outer peripheral projecting part 5 is arranged on the radial directional outer peripheral surface 4 of the prescribed void 7. Therefore, pressure of the sealed void 7 is increased, and adhesion of this part can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet used for sealing, for example, a lead-out portion of various electronic components (solenoids and the like).

[0002]

2. Description of the Related Art Conventionally, this type of grommet is used for sealing a lead wire take-out portion of various electronic parts and the like.

[0003] As an example, a case in which a lead wire take-out portion of a solenoid is sealed will be described with reference to FIGS.

[0004] The solenoid and the grommet attached to the solenoid are used even in an environment where the temperature changes drastically, such as in an engine room of an automobile, and where dust, rainwater, muddy water, oil and the like are apt to be applied. is there.

As shown in the figure, the grommet 101 is configured such that a part of the inner periphery of the lead wire insertion hole 103 provided in the grommet 101 (the tightening margin 104 in FIG. 7 or the contact portion 106 in FIG. The close contact prevents foreign matter from entering the inside.

The grommet 101 used for a molded coil or the like is connected to the grommet 101 by a lead wire 1.
02, and then molded,
It was attached to the solenoid.

[0007]

However, in the conventional example described above, the outer peripheral surface 105 has no interference, and is supported and fixed from the outer peripheral surface 105 by a mold resin material. Unevenness in the tightening of the lead wire 102 is caused, the sealing performance is deteriorated, water or the like enters the solenoid, and the insulation between the positive and negative electrodes and the insulation between the coil and the case are not performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a grommet having good sealing properties.

[0009]

According to the present invention, there is provided an elastic member made of an elastic member which has a lead wire insertion hole for inserting a lead wire and is attached to a mating member by molding. In the grommet, a side surface of the lead wire insertion hole is provided in a bellows shape, and in a state where the lead wire is inserted, an outer circumferential protrusion is formed on a radial outer circumferential surface of a gap formed between the lead wire and the side surface of the lead wire insertion hole. A part is provided.

Therefore, when the grommet in which the lead wire is inserted into the lead wire insertion hole is molded, the outer peripheral surface is pressed against the mold resin material, and the pressure in the sealed space is maintained at a high pressure.

As a result, the pressure of the air gap is increased
The outer peripheral convex portion of the outer peripheral surface can be constantly pressed against the mold resin material.

In a grommet made of an elastic member having a plurality of lead wire insertion holes into which lead wires are inserted and attached to a mating member by molding, a long hole penetrating a central portion between the lead wire insertion holes. Is provided.

Therefore, when the grommet in which the lead wire is inserted into the lead wire insertion hole is molded, the molding resin enters the long hole, and each of the lead wire insertion holes can be pressed.

Thus, the lead wire insertion hole can stably and uniformly press all directions of the outer periphery of the lead wire.

[0015]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The material, shape, relative arrangement, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

The grommet according to the embodiment of the present invention is used for sealing a lead wire lead-out portion of various electronic components and the like. As an example, a case where a lead wire lead-out portion of a solenoid is sealed will be described. I do.

(First Embodiment) FIG. 1 shows a grommet according to a first embodiment, and FIG. 2 is an enlarged view of a grommet according to the first embodiment in which a lead wire is inserted. FIG. 3 shows the grommet mounted on a solenoid.

As shown in the figure, the grommet 1 is configured such that a part of the inner periphery (abutting portion 6) of the lead wire insertion hole 3 provided in the grommet 1 is brought into close contact with the outer periphery of the lead wire 2 so that foreign matter is prevented from entering inside. Prevents intrusion.

Here, the grommet 1 used for the molded coil and the like is formed by molding the grommet 1 after the lead wire 2 is inserted through the grommet 1 to thereby form the solenoid 8.
Attached to.

The grommet 1 has a lead wire insertion hole 3 for inserting the lead wire 2 into the internal electrode of the solenoid 8 from the outside.
It is provided through. The outer peripheral surface 4 is provided with an outer peripheral convex portion 5.

The side surface of the lead wire insertion hole 3 is provided in a bellows shape, and when the lead wire 2 is inserted, a plurality of contact portions 6 are provided on the side surface of the lead wire insertion hole 3 at intervals. 2, a sealed gap 7 is formed, and an outer circumferential projection 5 is provided on a radially outer circumferential surface 4 of the predetermined gap 7.

The grommet is placed in an engine room of a car and is exposed to a high temperature. Therefore, the most suitable material is fluorine rubber having excellent heat resistance. Also, hydrogenated acrylonitrile butadiene rubber (HNBR), which has lower heat resistance but is less expensive than fluororubber, is used. In addition, when used in other environments where the operating temperature is low,
Acrylonitrile butadiene rubber (NB)
It is sufficient to use R) and chlorobrene rubber (CR).

The operation and effect of the above configuration will be described below.

The grommet 1 having the lead wire 2 inserted through the lead wire insertion hole 3 is mounted on a solenoid 8 and molded. By this molding, the outer peripheral surface 4 of the grommet 1 is pressed by the mold resin material, and the pressure in the sealed gap 7 is maintained at a high pressure.

As a result, the high pressure of the gap 7 constantly presses the outer peripheral convex portion 5 against the molding resin material, and the adhesion between the outer peripheral surface 4 and the molding resin material is improved, and the sealing is performed. The performance is improved.

(Second Embodiment) As in the first embodiment, the grommet is attached to the solenoid by molding. Here, the description of the same configuration as that of the first embodiment is omitted.

FIG. 4 shows a grommet according to a second embodiment, FIG. 5 shows a state after molding of the grommet according to the second embodiment, and FIG. 6 shows a grommet according to the second embodiment. An example of another grommet is shown.

The grommet 1 has a lead wire insertion hole 3 through which the lead wire 2 is inserted from the outside into the internal electrode of the solenoid. Further, the outer peripheral surface 4 is provided with an elongated hole 9 that penetrates a central portion between the lead wire insertion holes 3 so that the molding resin material 10 can enter therein.

The lead wire insertion hole 3 is provided in a bellows shape. When the lead wire 2 is inserted, a contact portion 6 provided on the side surface of the lead wire insertion hole 3 at a plurality of intervals is provided. A long hole 9 is provided corresponding to the outer periphery of the lead wire which comes into contact with the contact member 2 and is provided with the contact portion 6.

In this embodiment, the lead wire insertion holes 3 are provided in a bellows shape, but it is sufficient that the outer circumference of each lead wire 2 can be pressed together with the elongated hole 9.

As shown in FIG. 6, after inserting each lead wire 2 into the lead wire insertion hole 3, the grommet 1 is provided with a fixing portion 11 for fixing the grommet 1 to a bobbin (not shown). After fixing the grommet 1 to the bobbin, the grommet 1 is attached to the bobbin, and the outer periphery of each lead wire 2 is pressed by the molding resin material of the elongated hole 9 and the fixing portion 11 is fixed by the bobbin. It may be configured to receive and press.

The operation and effect of the above configuration will be described below.

The grommet 1 having the lead wire 2 inserted into the lead wire insertion hole 3 is mounted on a solenoid 8 and molded. As a result of this molding, the molding resin material 10 also enters the elongated holes 9 of the outer peripheral surface 4 of the grommet 1 and presses the respective lead wire insertion holes 3. Can be pressed stably and uniformly, and the sealing property is improved.

When the grommet according to the first embodiment is provided with the elongated hole 9 and the outer peripheral convex portion 5 provided in the elongated hole 9, all directions of the outer periphery of each lead wire 2 are formed by molding. It is possible to stably and evenly press, and not only the effect of the present embodiment is obtained at the outer periphery of the lead wire 2 abutting on the abutment portion 6, but also the high pressure of the gap 7 is constantly increased. Is pressed against the mold resin material, the adhesion between the outer peripheral surface 4 and the mold resin material 10 is improved, and the sealing property is improved.

[0035]

According to the present invention, the side face of the lead wire insertion hole is provided in a bellows shape, and in the state where the lead wire is inserted, the radial direction of the gap formed between the lead wire and the side face of the lead wire insertion hole is improved. By providing the outer peripheral convex portion on the outer peripheral surface, the pressure of the sealed gap is maintained in a high pressure state, so the high pressure of the void is constantly, and the outer convex portion of the outer peripheral surface is molded resin. By pressing against the material, the adhesion between the outer peripheral surface and the mold resin material is improved, and the sealing property is improved.

By providing a long hole that penetrates the central portion between the lead wire insertion holes, when the grommet with the lead wire inserted through the lead wire insertion hole is molded, the molding resin material enters the long hole. Since each lead wire insertion hole is pressed, the lead wire insertion hole can stably and uniformly press the outer periphery of the lead wire in all directions, thereby improving the sealing performance.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view illustrating a grommet according to a first embodiment, and FIG. 1B is a front view illustrating a grommet.

FIG. 2 is an enlarged sectional view showing the grommet according to the first embodiment.

FIG. 3A is a front view showing a solenoid equipped with a grommet according to the first embodiment, and FIG.
FIG. 2 is a sectional view showing a solenoid.

FIG. 4A is a cross-sectional view illustrating a grommet according to a second embodiment, and FIG. 4B is a front view illustrating the grommet.

FIG. 5A is a top view showing a state after molding of a grommet according to a second embodiment; FIG.
FIG. 5B is a sectional view taken along the line AA of FIG.
FIG. 5C is a sectional view taken along line BB of FIG.

FIG. 6A is a cross-sectional view showing another example of a grommet according to the second embodiment, and FIG. 6B is a left side view showing the grommet.

FIG. 7A is a sectional view showing a grommet of a conventional example, and FIG. 7B is a front view showing the grommet.

FIG. 8A is a cross-sectional view illustrating a grommet of a conventional example, and FIG. 8B is a front view illustrating the grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 Lead wire 3 Lead wire insertion hole 4 Outer peripheral surface 5 Outer peripheral convex part 6 Contact part 7 Void 8 Solenoid 9 Elongated hole 10 Mold resin material 11 Fixed part

Claims (2)

[Claims] 1. A grommet made of an elastic member having a lead wire insertion hole for inserting a lead wire and attached to a mating member by molding, wherein a side surface of the lead wire insertion hole is provided in a bellows shape. A grommet characterized in that an outer peripheral convex portion is provided on a radially outer peripheral surface of a gap formed between a lead wire and a side surface of the lead wire insertion hole in a state where the wire is inserted. 2. A grommet made of an elastic member having a plurality of lead wire insertion holes into which lead wires are inserted and attached to a mating member by molding, penetrating a central portion between the lead wire insertion holes. A grommet characterized by having an elongated hole.