JP6148031B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet that is fitted into a hole formed in a casing of a device.

  Usually, an electric device such as a power conditioner has an electric wire or a bundle of electric wires for the supply and demand of electric power and the transmission and reception of signals. An insertion hole for inserting these electric wires is formed in the housing of the electric device. A grommet having a hole (see Patent Document 1) is provided in the insertion hole to avoid damage to the coating of the electric wire due to direct contact between the rigid casing and the electric wire, and the electric wire is inserted into the casing through the grommet. It is common to let it pass through.

Japanese Patent Laid-Open No. 06-233435

  In a type of electrical equipment that is installed at a fixed position such as a power conditioner, since the position through which the electric wire is inserted varies depending on the installation location, the insertion holes are formed at various positions of the housing. In such an electric device, it is necessary to allow an electric wire to pass through some of the insertion holes, but it is necessary to seal other insertion holes for waterproofing and dustproofing.

  It is conceivable to seal the insertion hole by fitting a sealing grommet having a film for sealing the insertion hole into the insertion hole to be sealed. However, it is cumbersome to manage different types of grommets and use them separately for each insertion hole.

  In order to avoid complication of proper use of different types of grommets, it is common to use sealing grommets as grommets for inserting electric wires. For example, a part of the sealing grommet can be cut and the electric wire can be inserted through the cut to be used for inserting the electric wire. However, when the electric wire is inserted into the notch, the sealing performance is reduced due to the difference between the notch and the shape of the electric wire. Therefore, an extra process such as caulking is required.

  Therefore, the object of the present invention made in view of such circumstances is applicable to any use of sealing an insertion hole and inserting an electric wire, and provides a grommet that suppresses a reduction in sealing performance at the time of inserting the electric wire. There is to do.

In order to solve the above-mentioned problems, the grommet according to the first aspect is
A grommet attached to an insertion hole formed in the housing of the device,
A sealing portion for sealing the insertion hole;
A protrusion formed on the first surface of the sealing portion, having elasticity, hollow inside, and sealing the insertion hole together with the sealing portion ;
Arranging the plurality of protrusions on the first surface;
The protrusion has a large-diameter portion and a plurality of small-diameter portions having a diameter smaller than that of the large-diameter portion, and the plurality of small-diameter portions are formed on a distal end side in the protrusion direction of the large-diameter portion To do.
The grommet according to the second viewpoint is
A grommet attached to an insertion hole formed in the housing of the device,
A sealing portion for sealing the insertion hole;
A protrusion formed on the first surface of the sealing portion, having elasticity, hollow inside, and sealing the insertion hole together with the sealing portion;
A plurality of the protrusions are disposed on the first surface.
The plurality of protrusions are arranged along concentric circles on the first surface.
It is characterized by this.

In the grommet according to the third aspect ,
The protrusion preferably has a diameter that changes in the protrusion direction.

In the grommet according to the fourth aspect,
It is preferred that the diameter of the protruding portion becomes thinner as the toward the collision force direction of the distal end.

In the grommet according to the fifth aspect ,
It is preferable that a cross section along a plane perpendicular to the protrusion direction of the protrusion is circular.

In the grommet according to the sixth aspect ,
It is preferable that the protrusion has a tapered shape at least partially.

In the grommet according to the seventh aspect,
It is preferable that the projecting portion having a larger diameter is disposed toward the center on the first surface.

In the grommet according to the eighth aspect,
It is preferable that the projecting portion having a longer projecting direction is disposed toward the center on the first surface.

In the grommet according to the ninth aspect,
The shape of the protrusion disposed on the center side of the first surface is at least from the tip of the protrusion to the tip of the protrusion disposed on the outer edge side of the first surface from the protrusion. A tapered shape is preferred.

  According to the grommet according to the present invention configured as described above, it can be applied to both the sealing of the insertion hole and the insertion of the electric wire, and can suppress the reduction of the sealing performance at the time of the insertion of the electric wire. .

1 is an external view of a grommet according to a first embodiment of the present invention. It is sectional drawing along the plane which passes along the central axis of the grommet of FIG. It is an external view which shows the state which cut | disconnected the projection part of the grommet of FIG. It is an external view which shows the state which inserted the electric wire with a large diameter in the grommet of FIG. It is an external view which shows the state which penetrated the thin diameter electric wire to the grommet of FIG. It is an external view of the grommet of 2nd Embodiment. It is an external view of the grommet of 3rd Embodiment. It is an external view of the grommet of 4th Embodiment. It is an external view of the grommet of 5th Embodiment. FIG. 10 is a layout view of protrusions when the grommet of FIG. 9 is viewed from the tip side in the protrusion direction. It is an external view of the grommet of 6th Embodiment. It is the schematic diagram which looked at the grommet from the side in order to demonstrate the shape of the projection part in the modification of the grommet of 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the grommet which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is an external view of a grommet according to this embodiment.

  The grommet 10 is integrally formed of an elastic body and has a ring part 11, a sealing part 12, and a protruding part 13.

  The ring portion 11 is annular and has a concave shape on the outer surface side in a cross section along a plane passing through the central axis cx (see FIG. 2). The grommet 10 can be fixed to the insertion hole by fitting the ring portion 11 into the insertion hole of the housing of the electric device.

  The sealing portion 12 is formed in a film shape at one end of the ring portion 11 in the direction of the central axis cx. The sealing part 12 seals the inner cavity of the ring part 11 together with the protrusion 13 described later. That is, the sealing part 12 seals the insertion hole together with the protrusion 13 when the grommet 10 is fixed to the insertion hole.

  The protruding portion 13 is formed so as to protrude from the sealing portion 12 along a protruding direction parallel to the central axis cx. The protrusion 13 has a hollow cylindrical shape, and the outer edge and the inner edge of a cross section along a plane perpendicular to the protrusion direction are circular. Further, the protrusion 13 is sealed at the tip, and seals the lumen of the ring portion 11 together with the sealing portion 12.

  As described above, according to the grommet of the first embodiment, the protruding portion 13 that seals the insertion hole together with the sealing portion 12 is formed. Therefore, as described below, it is possible to improve the sealing performance during insertion in a common grommet that can be applied to both insertion holes that require the insertion of electric wires and unnecessary insertion holes. is there.

  As described above, insertion holes are formed at various positions in the housing of the electric device. In the insertion hole that requires the insertion of the electric wire, the projection 13 of the grommet 10 is cut along a plane substantially perpendicular to the projection direction, thereby forming a cylindrical shape that penetrates the grommet 10 as shown in FIG. An opening 14 is formed. When the electric wire 15 thicker than the inner diameter of the protruding portion 13 is inserted (see FIG. 4), the inner surface of the protruding portion 13 and the electric wire 15 are brought into close contact with each other by elastic deformation, and high sealing performance is provided between the grommet 10 and the electric wire 15. . Further, when the electric wire 15 thinner than the inner diameter of the protruding portion 13 is inserted (see FIG. 5), the inner surface of the protruding portion 13 and the electric wire 15 are in close contact with each other by binding the outer periphery of the protruding portion 13 with the binding body 16. A high sealing property is provided between the grommet 10 and the electric wire 15. On the other hand, in the insertion hole that does not require the insertion of the electric wire 15, the insertion hole can be sealed by fitting the grommet 10 into the insertion hole without cutting the protrusion 13.

  Moreover, according to the grommet of 1st Embodiment, since the cross section of the projection part 13 is circular, the sealing performance with the electric wire 15 which is normal that a cross section is circular can be improved further.

  Next, a second embodiment of the present invention will be described. In the second embodiment, the shape of the protrusion is different from that of the first embodiment. The second embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  As shown in FIG. 6, in the second embodiment, the grommet 100 is integrally formed of an elastic body and has a ring part 11, a sealing part 12, and a protruding part 130, as in the first embodiment. . The configurations and functions of the ring portion 11 and the sealing portion 12 are the same as those in the first embodiment.

  Similar to the first embodiment, the projecting portion 130 is formed so as to protrude from the sealing portion 12, has a hollow cylindrical shape inside, and has a sealed tip, and together with the sealing portion 12, the annular portion 11. Seal the lumen. Unlike the first embodiment, the protrusion 130 has a first cylindrical portion 130a, a second cylindrical portion 130b, and a third cylindrical portion 130c. The third cylindrical portion 130c, the second cylindrical portion 130b, the third cylindrical portion 130c, the first cylindrical portion 130a, and the third cylindrical portion 130c are directed from the sealing portion 12 side along the protrusion direction toward the tip. Are continuous so as to have a coaxial axis. The inner diameter of the first cylindrical portion 130a is the shortest, and the third cylindrical portion 130c is the longest.

  As described above, the grommet according to the second embodiment also has the protruding portion 130 that seals the insertion hole together with the sealing portion 12 as in the first embodiment. In a common grommet applicable to any unnecessary insertion hole, it is possible to improve the sealing performance at the time of insertion by a simple process. Moreover, also with the grommet of 2nd Embodiment, since the cross section of the projection part 130 is circular similarly to 1st Embodiment, the sealing performance with the electric wire 15 can further be improved.

  Furthermore, according to the grommet of the second embodiment, the diameter of the protrusion 130 changes along the protrusion direction. Therefore, it is possible to further improve the sealing performance by cutting the projection 130 at a portion having an inner diameter close to the outer diameter of the inserted wire 15 and bringing the wire 15 into close contact with the cut portion. For example, when inserting a thin wire 15, the protrusion 130 may be cut in the first cylindrical portion 130 a, and when inserting a thick wire 15, a third portion from the sealing portion 12 may be used. What is necessary is just to cut | disconnect the cylindrical part 130c, and what is necessary is just to cut | disconnect the projection part 130 in the 2nd cylindrical part 130b, when inserting the electric wire 15 about the diameter.

  Next, a third embodiment of the present invention will be described. In the third embodiment, the shape of the protrusion is different from that of the first embodiment. The third embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  As shown in FIG. 7, in the third embodiment, the grommet 101 is integrally formed of an elastic body and has a ring portion 11, a sealing portion 12, and a protruding portion 131, as in the first embodiment. . The configurations and functions of the ring portion 11 and the sealing portion 12 are the same as those in the first embodiment.

  Similar to the first embodiment, the protruding portion 131 is formed so as to protrude from the sealing portion 12, is hollow inside, has a sealed tip, and together with the sealing portion 12, the lumen of the ring portion 11. Seal. Unlike the first embodiment, the protruding portion 131 is formed in a truncated cone shape having a small diameter toward the tip in the protruding direction. The shape of the protrusion 131 may be formed in a tapered shape such as a conical shape having a small diameter in the distal direction.

  As described above, the grommet according to the third embodiment also has the protrusion 131 that seals the insertion hole together with the sealing portion 12 as in the first embodiment. In a common grommet applicable to any unnecessary insertion hole, it is possible to improve the sealing performance at the time of insertion by a simple process. Moreover, also with the grommet of 3rd Embodiment, since the cross section of the projection part 131 is circular similarly to 1st Embodiment, the sealing performance with the electric wire 15 can further be improved. Also, the grommet according to the third embodiment can further improve the sealing performance because the diameter of the protrusion 131 changes along the protrusion direction.

  Furthermore, according to the grommet of the third embodiment, since the protrusion 131 is tapered (conical frustum shape), the diameter of the protrusion 131 changes continuously. Therefore, the inner diameter of the protrusion 131 can be adjusted more finely than the diameter of the electric wire 15 as compared with the second embodiment. Therefore, the sealing performance between the protrusion 131 and the electric wire 15 can be further improved.

  Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the number of protrusions is different from that in the first embodiment. The fourth embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  As shown in FIG. 8, in the fourth embodiment, the grommet 102 is integrally formed of an elastic body and has a ring part 11, a sealing part 12, and a protruding part 132, as in the first embodiment. . The configurations and functions of the ring portion 11 and the sealing portion 12 are the same as those in the first embodiment.

  Similar to the first embodiment, the projecting portion 132 is formed so as to protrude from the sealing portion 12, the inside is hollow, the tip is sealed, and the lumen of the annular portion 11 is sealed together with the sealing portion 12. Seal. Further, the protruding portion 132 has, for example, a cylindrical shape as in the first embodiment or a truncated cone shape as in the third embodiment. Unlike the first embodiment, the plurality of protrusions 132 are arranged on the first surface 12 s forming the sealing portion 12.

  As described above, the grommet according to the fourth embodiment also has the protruding portion 132 that seals the insertion hole together with the sealing portion 12, as in the first embodiment. In a common grommet applicable to any unnecessary insertion hole, it is possible to improve the sealing performance at the time of insertion by a simple process. Moreover, also with the grommet of 4th Embodiment, since the cross section of the projection part 132 is circular similarly to 1st Embodiment, the sealing performance with the electric wire 15 can further be improved.

  Furthermore, according to the grommet of the fourth embodiment, since the plurality of protrusions 132 are provided, even when the plurality of electric wires 15 are inserted through the grommet 102, the complicated steps are increased as described below. It is possible to suppress a decrease in sealing performance. Generally, a wire bundle in which a plurality of wires 15 are bundled through a single grommet may be inserted. In such a case, a gap is generated between the electric wire 15 and the electric wire 15 and the sealing performance of the grommet is lowered. The process of filling the caulking material in the gap can suppress a decrease in sealing performance, but is complicated. On the other hand, according to the grommet of this embodiment, since the generation | occurrence | production of the clearance gap between the electric wires 15 can be prevented by inserting the one electric wire 15 in the one projection part 132, the fall of a sealing performance is suppressed without a complicated process. Is possible.

  Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, the number and shape of the protrusions are different from those in the first embodiment. The fifth embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  As shown in FIG. 9, in the fifth embodiment, the grommet 103 is integrally formed of an elastic body and has a ring portion 11, a sealing portion 12, and a protruding portion 133, as in the first embodiment. . The configurations and functions of the ring portion 11 and the sealing portion 12 are the same as those in the first embodiment.

  Similar to the first embodiment, the protruding portion 133 is formed so as to protrude from the sealing portion 12, the inside is hollow, the tip is sealed, and the lumen of the ring portion 11 is sealed together with the sealing portion 12. Seal. Further, the protrusion 133 is, for example, a cylindrical shape as in the first embodiment, or a truncated cone shape as in the third embodiment. Unlike the first embodiment, the plurality of protrusions 133 are arranged on the first surface 12 s constituting the sealing portion 12. The plurality of protrusions 133 are arranged along concentric circles on the first surface 12s as shown in FIG. The outer diameter and inner diameter of the protrusion 133 increase as the protrusion 133 is arranged from the outer edge of the first surface 12s toward the center. Further, the length of the protruding portion 133 in the protruding direction becomes longer as the protruding portion 133 is arranged from the outer edge of the first surface 12s toward the center (see FIG. 9).

  As described above, the grommet according to the fifth embodiment also has the projection 133 that seals the insertion hole together with the sealing portion 12 as in the first embodiment. In a common grommet applicable to any unnecessary insertion hole, it is possible to improve the sealing performance at the time of insertion by a simple process. Moreover, also with the grommet of 5th Embodiment, since the cross section of the projection part 133 is circular similarly to 1st Embodiment, the sealing performance with the electric wire 15 can further be improved. Moreover, since the grommet of the fifth embodiment also has a plurality of protrusions 133 as in the fourth embodiment, the number of complicated steps is increased even when the plurality of electric wires 15 are inserted through the grommet 103. It is possible to suppress a decrease in sealing performance.

  Furthermore, according to the grommet of the fifth embodiment, since the protrusions 133 with various diameters are provided, the sealing performance can be further improved for the electric wires 15 with various outer diameters. Moreover, since the diameter of the protrusion 133 becomes thicker toward the center, it is possible to arrange a large-diameter electric wire 15 that is heavy and has low flexibility in the central portion of the grommet 103, and further improve the sealing performance. Is possible.

  Further, according to the grommet of the fifth embodiment, the length along the protruding direction of the protruding portion 133 becomes longer from the outer edge on the first surface 12s toward the center, so that the protruding portion 133 from the surroundings can be used. The protrusion 133 from the center can be cut without breaking.

  Further, according to the grommet of the fifth embodiment, since the protrusions 133 are arranged along concentric circles, efficient arrangement is possible.

  Next, a sixth embodiment of the present invention will be described. In the sixth embodiment, the number and shape of the protrusions are different from those in the first embodiment. The sixth embodiment will be described below with a focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same structure as 1st Embodiment.

  As shown in FIG. 11, in the sixth embodiment, the grommet 104 is integrally formed of an elastic body and has the ring part 11, the sealing part 12, and the protruding part 134, as in the first embodiment. . The configurations and functions of the ring portion 11 and the sealing portion 12 are the same as those in the first embodiment.

  Similar to the first embodiment, the protruding portion 134 is formed so as to protrude from the sealing portion 12, is hollow inside, has a sealed tip, and together with the sealing portion 12, the lumen of the ring portion 11. Seal. Unlike the first embodiment, the plurality of protrusions 134 are disposed on the first surface 12 s constituting the sealing portion 12. Each protrusion 134 has a fourth cylindrical portion 134a, a fifth cylindrical portion (small diameter portion) 134b, and a sixth cylindrical portion (large diameter portion) 134c. The fourth cylindrical portion 134a, the fifth cylindrical portion 134b, and the sixth cylindrical portion 134c are, for example, cylindrical, and the fourth cylindrical portion 134a, the fifth cylindrical portion 134b, and the sixth cylindrical portion. The diameter increases in the order of 134c. A plurality of fifth cylindrical portions 134b are formed on the distal end side in the protruding direction of the sixth cylindrical portion 134c. A plurality of fourth cylindrical portions 134a are formed on the distal end side in the protruding direction of the fifth cylindrical portion 134b.

  As described above, the grommet according to the sixth embodiment also has the insertion hole as well as the sealing portion 12 and the projection 134 as in the first embodiment. In a common grommet applicable to any of the insertion holes, it is possible to improve the sealing performance at the time of insertion by a simple process. Moreover, also with the grommet of 6th Embodiment, since the cross section of the projection part 134 is circular similarly to 1st Embodiment, the sealing performance with the electric wire 15 can further be improved. Also, the grommet of the sixth embodiment has a plurality of protrusions 134 as in the fourth embodiment, and therefore increases the number of complicated steps even when inserting the plurality of electric wires 15 through the grommet 104. It is possible to suppress a decrease in sealing performance.

  Furthermore, according to the grommet of the sixth embodiment, since the protruding portion 134 has the fourth cylindrical portion 134a, the fifth cylindrical portion 134b, and the sixth cylindrical portion 134c having different diameters, various outer diameters can be obtained. The sealing performance can be further improved with respect to the electric wire 15. Further, in the grommet of the sixth embodiment, the diameter of the protrusion 134 can be partially increased compared to the grommet of the fifth embodiment, and the thicker electric wire 15 can be inserted.

  Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

  For example, in the fourth and fifth embodiments, the protrusions 132 and 133 are cylindrical and frustoconical, and in the sixth embodiment, the fourth cylindrical part 134a and the fifth cylindrical part of the protrusion 134 are provided. Although 134b and the 6th cylindrical part 134c are cylindrical, it is not limited to such a shape. For example, the site | part by the side of the sealing part 12 of the protrusion parts 132, 133, 134 in the protrusion direction may be cylindrical, and the part on the tip side may be a truncated cone shape or a cone shape. In particular, in the fifth embodiment, as shown in FIG. 12, in the protrusion 133 on the center side of the first surface 12 s, between the tip of the protrusion 133 and the tip of the protrusion 133 on the outer edge side. It is conceivable to deform the part into a tapered shape like a truncated cone. According to such a configuration, after selecting the projection 133 having an inner diameter close to the outer diameter of the electric wire 15 to be inserted in the cylindrical portion, the cutting position of the tapered portion is adjusted by adjusting the cutting position of the tapered portion. It is possible to make the inner diameter of the surface closer to the outer diameter of the electric wire 15. Therefore, the sealing performance can be further improved.

10, 100, 101, 102, 103, 104 Grommet 11 Ring portion 12 Sealing portion 12s First surface 13, 130, 131, 132, 133, 134 Protruding portion 130a, 130b, 130c First cylindrical portion, second Cylindrical part, third cylindrical part 134a, 134b, 134c Fourth cylindrical part, fifth cylindrical part, sixth cylindrical part 14 Opening 15 Electric wire 16 Bundled body cx Central axis

Claims (9)

A grommet attached to an insertion hole formed in the housing of the device,
A sealing portion for sealing the insertion hole;
A protrusion formed on the first surface of the sealing portion, having elasticity, hollow inside, and sealing the insertion hole together with the sealing portion;
Arranging the plurality of protrusions on the first surface;
The protrusion has a large-diameter portion and a plurality of small-diameter portions having a diameter smaller than that of the large-diameter portion, and the plurality of small-diameter portions are formed on a distal end side in the protrusion direction of the large-diameter portion Grommet to do. A grommet attached to an insertion hole formed in the housing of the device,
A sealing portion for sealing the insertion hole;
A protrusion formed on the first surface of the sealing portion, having elasticity, hollow inside, and sealing the insertion hole together with the sealing portion;
A plurality of the protrusions are arranged on the first surface, and the plurality of protrusions are arranged along concentric circles on the first surface.   3. The grommet according to claim 1, wherein a diameter of the projecting portion changes in a projecting direction. 4. A grommet according to any one of claims 1 to 3, the grommet, characterized in that the diameter of the protruding portion becomes thinner as the toward the tip of the collision force direction.   The grommet according to any one of claims 1 to 4, wherein a cross section along a plane perpendicular to the protruding direction of the protruding portion is circular.   The grommet according to claim 5, wherein the protrusion has a tapered shape at least partially.   The grommet according to any one of claims 1 to 6, wherein the protruding portion having a larger diameter is arranged toward the center on the first surface.   The grommet according to any one of claims 1 to 7, wherein the protruding portion having a longer protruding direction is disposed toward the center on the first surface.   9. The grommet according to claim 8, wherein the shape of the protrusion disposed on the center side of the first surface is arranged at least on the outer edge side of the first surface from the protrusion from the tip of the protrusion. A grommet characterized by being tapered from the tip of the projected portion.

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