JP2017017977A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet capable of preventing (stopping water) moisture from entering between electric wires of a wire harness while realizing high sound insulation. SOLUTION: A large-diameter tubular portion 13 having a panel fixing portion, two tapered tubular connecting shielding walls 15 and 16 forming a sound insulating space S around a wire harness W, and an inner peripheral side of the connecting shielding wall. The inner cylinder portion 21 that is arranged and closely fitted to the outer circumference of the wire harness, the outer peripheral end 20a is connected to the large diameter cylinder portion 13, and the inner peripheral end 20b is connected to the inner cylinder portion 21, and the sound insulation space is divided in the axial direction. A water blocking portion 30 having a sound insulating wall 20 and having a gap between electric wires Wa of a wire harness to which the inner cylinder portion is closely fitted is sealed with a water blocking agent 31 is provided on the inner cylinder portion 21. [Selection diagram] Fig. 1

Description

  The present invention relates to a grommet attached to a panel penetration part of a wire harness.

  For example, when a wire harness (wire bundle) is routed through a vehicle body panel (dash panel, rear panel, etc.) that separates the interior of the vehicle from the exterior of the vehicle (engine room, trunk room, etc.) A grommet made of an elastic material such as rubber is attached between the through hole and the wire harness. By attaching the grommet in this way, the panel penetration part of the wire harness can be protected, and airtightness and quietness in the vehicle compartment can be secured.

  Recently, quietness in the passenger compartment has been strongly demanded, and grommets with improved sound insulation performance have been developed. As a grommet having improved sound insulation performance, a grommet having an air layer (air chamber) inside is known (see, for example, Patent Document 1).

  In this type of grommet, the internal air layer absorbs sound transmitted through the grommet, so that the sound insulation performance can be improved. In general, it is said that the sound insulation performance can be improved as the capacity of the air layer increases.

JP 2005-324613 A

  By the way, the grommet is often attached to a panel that partitions the interior of the vehicle interior from the exterior of the vehicle interior, but the exterior of the vehicle interior is often a wet environment. The grommet can prevent water from entering the vehicle interior from outside the vehicle compartment, which is a flooded environment, by closing the through hole of the panel. However, this point is not always sufficient.

  This invention is made | formed in view of the situation mentioned above, The objective can prevent the permeation of the water | moisture content transmitted between the electric wires of a wire harness (water stop), implement | achieving high sound insulation. To provide grommets.

In order to achieve the above-described object, the grommet according to the present invention is characterized by the following (1) to (11).
(1) A grommet that is fixed to a wire harness that is inserted through a through-hole of a panel, is fitted into the through-hole and is attached to the panel, and supports the wire harness on the panel,
A large-diameter cylindrical portion having a panel fixing portion fixed to the through hole;
Two small-diameter cylindrical portions that are arranged one by one on both sides in the axial direction of the large-diameter cylindrical portion, and are closely fitted to the outer periphery of the wire harness that is passed through the through hole;
Two connecting shielding walls that define an annular sound insulation space between the large-diameter cylindrical portion and each small-diameter cylindrical portion;
At least one small-diameter cylindrical portion of the two small-diameter cylindrical portions is provided with a water stop portion that prevents water from entering the sound insulation space from the outside via the small-diameter cylindrical portion.
(2) In the grommet configured as described in (1) above,
The said water stop part is comprised by the water stop agent which seals the clearance gap between the inner periphery of the said small diameter cylinder part, the electric wire of the said wire harness, and the electric wire, and the inner periphery of the said small diameter cylinder part.
(3) In the grommet configured as described in (1) or (2) above,
At least one small-diameter cylindrical portion of the two small-diameter cylindrical portions has a cylindrical portion extending downward between the connection shielding wall, and the water stop portion is configured by the cylindrical portion. Being.
(4) In the grommet configured as described in (3) above,
The said cylindrical part is formed in the bellows shape by which the several peak part and trough part over the circumferential direction were alternately formed in the axial direction.
(5) In the grommet having any one of the constitutions (1) to (4),
The small-diameter cylindrical portion is provided with a plurality of slit portions having slits whose inner peripheral side is opened at intervals in the circumferential direction.
(6) In the grommet configured as described in any of (1) to (5) above,
In the sound insulation space, an outer peripheral end is connected to an inner periphery of the large-diameter cylindrical portion or an inner periphery of the connection shielding wall at a position close thereto, and an inner peripheral end is in close contact with the outer periphery of the wire harness. A sound insulation wall that divides the sound insulation space in the axial direction is provided.
(7) A grommet that supports the wire harness on the panel by being fixed to the wire harness inserted into the through-hole of the panel, being fitted into the through-hole and being attached to the panel,
A large-diameter cylindrical portion having a panel fixing portion fixed to the through hole;
Extending from the large-diameter cylindrical portion to both sides in the axial direction, gradually decreasing in diameter as the distance from the large-diameter cylindrical portion is increased, and the inner peripheral end having the smaller diameter is disposed close to or in close contact with the outer periphery of the wire harness Two connected shielding walls defining a sound insulation space around the wire harness;
At least one end portion in the axial direction is inserted inside the inner peripheral end of the connection shielding wall, and an inner cylindrical portion that is closely fitted to the outer periphery of the wire harness;
Provided inside the sound insulation space, an outer peripheral end is connected to an inner periphery of the large-diameter cylindrical portion or an inner periphery of the connection shielding wall at a position close thereto, and an inner peripheral end is connected to the inner cylindrical portion. And having a sound insulation wall that partitions the sound insulation space in the axial direction,
The inner cylinder part is provided with a water-stop part in which a gap between the wires of the wire harness and the gap between the electric wire and the inner periphery of the inner cylinder part are sealed with a water-stopping agent. That.
(8) In the grommet configured as described in (7) above,
The inner cylinder portion extends continuously in the length of one half between both inner peripheral ends of the two connection shielding walls, and one end portion of the inner cylinder portion is on one side. It is inserted inside the inner peripheral end of the connection shielding wall, and the open end of the other end portion of the inner cylinder portion is open into the sound insulation space.
(9) In the grommet configured as described in (7) above,
The inner cylinder portion continuously extends over the entire length between both inner peripheral ends of the two connection shielding walls, and both end portions of the inner cylinder portion are located inside the inner peripheral ends of the connection shielding walls. Is inserted through.
(10) In the grommet having any one of the constitutions (7) to (9),
The said water stop part is arrange | positioned in the position near the noise generation side of the both sides of the said panel in an axial direction rather than the panel fixing | fixed part of the said large diameter cylinder part.
(11) A grommet that is fixed to a wire harness that is inserted through a through-hole of a panel, is fitted into the through-hole and is attached to the panel, and supports the wire harness on the panel,
A large-diameter cylindrical portion having a panel fixing portion fixed to the through hole;
Extending from the large-diameter cylindrical portion to both sides in the axial direction, gradually decreasing in diameter as the distance from the large-diameter cylindrical portion is increased, and the inner peripheral end having the smaller diameter is disposed close to or in close contact with the outer periphery of the wire harness Two connected shielding walls defining a sound insulation space around the wire harness;
At least one end portion in the axial direction is inserted inside the inner peripheral end of the connection shielding wall, and an inner cylindrical portion that is closely fitted to the outer periphery of the wire harness;
Provided inside the sound insulation space, an outer peripheral end is connected to an inner periphery of the large-diameter cylindrical portion or an inner periphery of the connection shielding wall at a position close thereto, and an inner peripheral end is connected to the inner cylindrical portion. A sound insulation wall that divides the sound insulation space in the axial direction,
An extension tube portion that extends downward and prevents water from entering from the outside is provided at an end portion of the inner tube portion that is inserted inside the inner peripheral end of the connection shielding wall.

According to the grommet having the configuration (1), it is possible to secure a sound insulation space (air layer) with a large capacity around the wire harness, so that sound insulation can be improved. Moreover, since the water stop part was provided in the small diameter cylindrical part, it is possible to prevent moisture from entering from the environment on one side of the panel to the environment on the other side through the gap between the wires of the wire harness. In addition, it is possible to prevent sound from entering through the gaps between the electric wires, thereby contributing to improvement in sound insulation.
According to the grommet having the configuration (2), a high water stop effect can be obtained by the water stop agent.
According to the grommet having the configuration (3), a water stop effect can be obtained without using a water stop agent.
According to the grommet having the configuration (4), the bellows-shaped cylindrical portion can be easily bent and extended downward.
According to the grommet having the configuration (5), when the internal mold is removed from the molded grommet, the slits of the respective slit portions are widened, so that the internal mold can be easily removed.
According to the grommet having the configuration (6), the sound insulation wall is provided in the sound insulation space, so that the two connection shielding walls and the sound insulation wall are transmitted and the panel proceeds from the environment on one side to the environment on the other side. The transmitted sound can be reduced and the sound insulation can be further enhanced.
According to the grommet having the configuration (7), it is possible to secure a sound insulation space (air layer) with a large capacity around the wire harness, so that sound insulation can be improved. In addition, since the sound insulation wall is provided inside the sound insulation space, it is possible to reduce the transmitted sound that is transmitted through the two connection shielding walls and the sound insulation wall and proceeds from the environment on one side of the panel to the environment on the other side. In addition, the sound insulation can be further enhanced. Moreover, since at least a part of the sound insulation space can be closed by closely contacting the inner cylinder portion and the inner peripheral end of the connection shielding wall, it is possible to further improve the sound insulation. Moreover, since the water stop part was provided in the inner cylinder part, it can prevent that a water | moisture content penetrate | invades from the environment of the one side of a panel through the clearance gap between the electric wires of a wire harness. In addition, it is possible to prevent sound from entering through the gaps between the electric wires, thereby contributing to improvement in sound insulation.
According to the grommet configured as described above (8), since the inner cylinder portion is extended from the middle in the axial direction to only one side, it is possible to improve the insertability of the wire harness when assembled to the wire harness.
According to the grommet having the configuration (9), since the inner cylinder portion extends from the middle in the axial direction to both sides, the adhesion between the wire harness and the inner cylinder portion can be improved.
According to the grommet having the configuration (10), a high water stop effect can be obtained by using an optimal amount of the water stop agent.
According to the grommet having the configuration (11), a water stop effect can be obtained without using a water stop agent.

  ADVANTAGE OF THE INVENTION According to this invention, the penetration | invasion of the water | moisture content transmitted between the electric wires of a wire harness can be prevented effectively (water stop), implement | achieving high sound insulation.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a sectional view of a grommet according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the relationship between the internal mold used for manufacturing the grommet and the grommet. FIG. 3 is a cross-sectional view of the grommet according to the second embodiment of the present invention. FIG. 4 is a cross-sectional view showing the relationship between the internal mold used for manufacturing the grommet and the grommet. FIG. 5 is a cross-sectional view of a grommet according to a third embodiment of the present invention. FIG. 6 is a cross-sectional view of the grommet in use. FIG. 7 is a schematic perspective view of a grommet according to a fourth embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of the grommet in use. FIG. 9 is a cross-sectional view showing the relationship between an internal mold used for manufacturing the grommet and the grommet. FIG. 10 is a front view of the grommet according to the fourth embodiment of the present invention. FIG. 11 is a rear view of the grommet according to the fourth embodiment of the present invention. FIG. 12 is a left side view of the grommet according to the fourth embodiment of the present invention. FIG. 13 is a right side view of the grommet according to the fourth embodiment of the present invention. FIG. 14 is a plan view of a grommet according to the fourth embodiment of the present invention. FIG. 15 is a bottom view of the grommet according to the fourth embodiment of the present invention. FIG. 16 is a perspective view of a grommet according to a fourth embodiment of the present invention. FIG. 17 is a cross-sectional view of a grommet according to a fourth embodiment of the present invention. FIG. 18 is a modified example of the fitting portion fitted into the through hole of the panel. FIG. 19 shows another modification of the fitting portion fitted in the through hole of the panel.

Specific embodiments relating to the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of the grommet of the first embodiment.
As shown in FIG. 1, the grommet 10 is integrally formed of an elastic material such as rubber or elastomer, and is fixed to a wire harness W that is inserted into the through hole Pa of the panel P, and is fitted into the through hole Pa. By attaching to the panel P, the wire harness W is supported on the panel P.

  The grommet 10 includes a large-diameter cylindrical portion 13 that is fitted in the through hole Pa of the panel P, two tapered cylindrical connecting shielding walls 15 and 16 that extend from the large-diameter cylindrical portion 13 to both sides in the axial direction, Provided along the direction intersecting the wire harness W on the inner periphery of the inner diameter portion of the large diameter cylindrical portion 13 and the inner cylinder portion 21 which is arranged on the inner periphery side of the connecting shielding walls 15 and 16 and closely fits to the outer periphery of the wire harness W. Sound insulation wall 20.

  The large-diameter cylindrical portion 13 includes an annular engagement groove 13a as a panel fixing portion that is fixed to the edge of the through hole Pa of the panel P on the outer periphery. The two tapered cylindrical connecting shielding walls 15 and 16 gradually become smaller in diameter as they move away from the large-diameter cylindrical portion 13, and have small-diameter cylindrical portions 11 and 12, respectively, at the inner peripheral ends that are reduced in diameter. The small diameter cylindrical portions 11 and 12 are portions that are arranged close to or in close contact with the outer periphery of the wire harness W. A sound insulation space S is formed around the wire harness W by the two tapered cylindrical connection shielding walls 15 and 16.

  The inner cylinder part 21 is inserted through the small diameter cylinder part 11 at the inner peripheral end of the connecting shielding wall 15 with an end part 21 a on one side in the axial direction (external side of the vehicle compartment such as the engine room). ing. As will be described later, the gap 25 may be closed with a tie band, a tape 40, or the like. The inner cylinder part 21 in this embodiment is continuous to the length of one half of the axial length between the inner peripheral ends (small diameter cylinder parts 11, 12) of the two tapered cylindrical connection shielding walls 15, 16. It is then extended. And, the opening end 22 of the end portion 21b (this end portion corresponds to the position of the panel P) opposite to the side inserted into the inside of the small diameter cylindrical portion 11 at the inner peripheral end of the connection shielding wall 15, The sound insulation space S is open.

  The sound insulating wall 20 is disposed inside the sound insulating space S, and the outer peripheral end 20 a is connected to the inner periphery of the large diameter cylindrical portion 13 and the inner peripheral end 20 b is connected to the inner cylindrical portion 21. Thereby, the sound insulation space S is divided into two sound insulation spaces S1 and S2 in the axial direction. The sound insulation wall 20 is formed as an annular corrugated wall. The corrugated wall is obtained by forming an annular wall plate into a concentric corrugated shape, and the corrugated shape is included in the corrugated shape. The sound insulation wall 20 is most preferably connected to a position corresponding to the inner peripheral panel P of the large-diameter cylindrical portion, but is connected to the inner periphery of the connection shielding walls 15 and 16 at positions close thereto. Also good.

  The grommet 10 is attached to the wire harness W as follows. That is, the wire harness W is passed through the inside of the inner tube portion 21 and the inside of one small diameter tube portion 12, and the one small diameter tube portion 12 is wound and fixed around the wire harness W with a tie band, tape 40 or the like. Further, the other small-diameter cylindrical portion 11 located outside the inner cylindrical portion 21 is wound and fixed on the wire harness W from above the inner cylindrical portion 21 with a tie band or tape 40. By doing so, the grommet 10 is fixed to the wire harness W.

  And before or after assembling the wire harness W to the grommet 10, the gap between the electric wires Wa of the wire harness W to which the inner cylinder portion 21 is closely fitted and the gap between the electric wires Wa and the inner periphery of the inner cylinder portion 21 may be used. By injecting and solidifying a water stop agent 31 such as silicon, a water stop portion 30 in which a gap between the electric wires Wa is sealed is provided inside the inner cylinder portion 21. With the configuration as described above, the large-diameter cylindrical portion 13 of the grommet 10 is fitted into the through hole Pa of the panel P, the engagement groove 13a is engaged with the edge of the through hole Pa, and the panel P is mounted. Thereby, the wire harness W can be supported by the panel P with a grommet. In this way, when the grommet 10 is fitted into the through hole Pa of the panel P, the through hole Pa is sealed with the grommet 10.

  The grommet 10 has a sound insulation space S inside, and further has a sound insulation wall 20 inside the sound insulation space S. Therefore, the noise transmitted from the engine room on the left side of the panel P to the vehicle interior on the right side of the panel P through the grommet 10 is transmitted by the two connection shielding walls 15 and 16, the sound insulation wall 20 and the sound insulation space S (S 1 and S 2). Can be reduced.

  In this case, since the sound insulation space (air layer) S having a large capacity can be secured around the wire harness W, the sound insulation can be improved. In particular, since the sound insulation wall 20 disposed inside the sound insulation space S has the outer peripheral end 20a and the inner peripheral end 20b coupled to the inner periphery of the large-diameter cylindrical portion 13 and the outer periphery of the inner cylindrical portion 21, respectively. Can be divided into two while keeping airtight. Therefore, leakage of transmitted sound between the divided sound insulation spaces S1 and S2 can be reliably prevented, and the soundproofing effect by the sound insulation wall 20 can be further enhanced.

  Further, since the sound insulating wall 20 is formed as an annular corrugated wall, the incident sound hitting the corrugated wall is reflected while being diffused. Therefore, the cancellation of the waves of the incident sound and the reflected sound becomes active and the sound insulation is improved. Moreover, since the sound insulation wall 20 is arrange | positioned in the panel fitting position of the center of the grommet 10 with which the transmitted sound always passes, reliable soundproof performance can be exhibited. Therefore, even if the thickness of the sound insulating wall 20 is not particularly increased, a high sound reduction effect by the sound insulating wall 20 can be obtained.

  In this grommet 10, the small diameter cylindrical portion 11 at the inner peripheral end of the connecting shielding wall 15 is fastened to the outer periphery of the inner cylindrical portion 21 with a tie band, tape 40, or the like. It is also possible to place them close to each other in a non-contact state. In such a case, the entry of external sound into the sound insulation space S can be reduced as much as possible. However, after passing the wire harness W through the inner cylinder part 21 as shown in the example, the small diameter cylinder part 11 and the inner cylinder part can be obtained by tightening the small diameter cylinder part 11 together with the inner cylinder part with a tie band or tape 40 or the like. Since the annular gap 25 between the two gaps 21 can be closed, the intrusion of sound from the gap can be blocked, and further improvement in soundproofing can be achieved.

  Moreover, since the water stop part 30 is provided in the inside of the inner cylinder part 21, it passes through the clearance gap between the electric wires Wa of the wire harness W, and the other side from the environment (for example, engine room) of the panel P is provided. It is possible to prevent moisture from entering the environment (for example, the passenger compartment). In addition, it is possible to prevent sound from entering through the gaps between the electric wires Wa, thereby contributing to improvement in sound insulation. In this case, the water stop portion 30 can be arranged at any position in the axial direction of the inner cylinder portion 21 to obtain a water stop effect, but as shown in the illustrated example, than the panel fixing portion of the large diameter cylinder portion 13, By disposing at a position close to the noise generating side (engine room side) on the left side in the drawing in both sides of the panel P in the axial direction, a high water stopping effect can be obtained by using the optimum amount of the water stopping agent 31.

  Moreover, according to the grommet 10 of this embodiment, since the inner cylinder part 21 is extended only to one side from the middle of the axial direction, the insertion property of the wire harness W at the time of assembling | attaching to the wire harness W can be improved.

  In addition, by filling the sound insulation space S (S1, S2) with a sound absorbing material, the transmitted sound can be further absorbed, and a higher soundproofing effect can be obtained.

Next, a method for manufacturing the grommet 10 will be described.
The grommet 10 is obtained as a molded product by injecting a molten material into a cavity in a mold and releasing the mold after the material is solidified. As the mold, an external mold for forming the shape of the outer peripheral surface of the grommet 10 and an internal mold for forming the shape of the inner peripheral surface are used.

FIG. 2 shows the relationship between the grommet 10 and the internal mold.
When manufacturing the grommet 10 of this embodiment, the internal metal mold | die which shape | molds the internal shape of the grommet 10 is divided into 2 in the axial direction on the sound insulation wall 20 as a boundary. A rod-shaped mold part TB2 that forms the inside of the inner cylinder part 21 is integrated with the main body part TB1 in the internal mold TB that is one split mold.

  Then, after the grommet 10 is molded, one of the two inner molds TA and TB is molded on one axial side (arrow A direction) relative to the molded grommet 10. Unplug. In addition, the other internal mold TB of the two divided internal molds TA and TB is punched out to the other side (arrow B direction) in the axial direction relative to the molded grommet 10. Thus, the grommet 10 as a molded product can be obtained. By extracting the internal molds TA and TB divided in this way from the grommet 10 in the opposite directions, the grommet 10 having an integrated structure including the sound insulating wall 20 can be easily formed.

  When releasing the internal molds TA and TB, if the air is blown between the grommet 10 and the internal molds TA and TB to expand the grommet 10, the internal molds TA and TB can be more easily removed from the grommet 10. Can be pulled out.

Next, the grommet of 2nd Embodiment is demonstrated.
FIG. 3 is a cross-sectional view of the grommet according to the second embodiment. In the grommet 10 of the first embodiment shown in FIG. 1, the inner cylinder portion 21 is formed to have a length that is half the total length of the grommet 10 in the axial direction. On the other hand, the grommet 110 according to the second embodiment continuously connects the inner cylinder portion 21 over the entire length between the inner peripheral ends (small-diameter cylinder portions 11 and 12) of the two tapered cylindrical connection shielding walls 15 and 16. And extended. Then, both end portions 21 a and 21 b of the inner cylindrical portion 21 are inserted inside the small diameter cylindrical portions 11 and 12 at the inner peripheral ends of the connection shielding walls 15 and 16 while maintaining an annular gap 25. Further, in order to relieve the assembly stress when fitted to the panel P, an annular curved portion 17 curved in an S shape is interposed between the connecting shielding wall 16 on the insertion side and the small diameter cylindrical portion 12. ing. Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  According to the grommet 110 of this 2nd Embodiment, the effect similar to the grommet 10 of 1st Embodiment can be acquired. In addition, in this grommet 110, since the inner cylinder part 21 extends from the middle in the axial direction (position of the panel fixing part) to both sides as well as the both sides, the adhesion between the wire harness W and the inner cylinder part 21 is increased. Can be improved.

  When manufacturing the grommet 110 according to the second embodiment, the following internal mold is used. FIG. 4 shows the relationship between the grommet 110 and the internal mold.

  When manufacturing the grommet 110 of 2nd Embodiment, the three internal metal mold | die which shape | molds the internal shape of the grommet 110 is used. That is, the internal mold that forms the sound insulation space S is divided into two in the axial direction with the sound insulation wall 20 as a boundary, and the first internal mold TA on one side in the axial direction and the second internal mold TB on the other side in the axial direction. Is used. Further, a third internal mold TC that molds the inner periphery of the inner cylinder portion 21 is used.

  After forming the grommet 110 using the first to third internal molds TA, TB, and TC, the first of the two divided internal molds TA and TB is used for die cutting. The internal mold TA is punched in one axial direction (arrow A direction) relative to the molded grommet 110. In addition, the second internal mold TB among the two internal molds TA and TB is die-cut to the other axial side (arrow B direction) relative to the molded grommet 110. Further, the third internal mold TC is die-cut to one side (arrow C direction) or the other side. Thus, the grommet 110 as a molded product can be obtained.

When the grommet 110 is manufactured in this way, the divided internal molds TA and TB can be relatively removed from the grommet 110 without the molded sound insulating wall 20 being in the way. Therefore, the grommet 110 having an integral structure including the sound insulating wall 20 can be easily formed.
Also in this case, when the inner molds TA, TB, and TC are released, if the air is blown between the grommet 110 and the inner molds TA, TB, and TC to expand the grommet 110, the grommet 110 can be more easily removed. The internal molds TA, TB, TC can be pulled out.

Next, the grommet of 3rd Embodiment is demonstrated.
FIG. 5 is a sectional view of the grommet according to the third embodiment, and FIG. 6 is a sectional view of the grommet in use.
As shown in FIG. 5, the grommet 210 according to the third embodiment is obtained by providing an extended cylinder portion 21 c at the end 21 a of the inner cylinder portion 21 of the grommet 10 according to the first embodiment shown in FIG. 1. That is, in the end portion 21a of the inner cylinder portion 21 inserted inside the inner peripheral end (small-diameter cylinder portion 11) of the connecting shielding wall 15 (the end portion facing the wet environment such as the engine room), FIG. As shown, an extended cylinder portion 21c that is bent downward and extends long in the use state to prevent water from entering from the outside is provided.

  Since the extended cylindrical portion 21c in such a manner that it hangs downward is provided so as to extend to the inner cylindrical portion 21, it is difficult for moisture to enter the extended cylindrical portion 21c due to a capillary phenomenon between the electric wires Wa. Thus, this portion corresponds to the water stop portion 60. In this case, since the water stop agent 31 is not used, the injection process of the water stop agent 31 can be omitted. Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  In the example shown in FIG. 5, the inner cylinder portion 21 extends to a length that is half the total length between both inner peripheral ends (small-diameter cylinder portions 11, 12) of the two connection shielding walls 15, 16. Although shown as a modified example of the case, as in the second embodiment, the inner cylindrical portion 21 extends over the entire length between the inner peripheral ends (small-diameter cylindrical portions 11, 12) of the two connecting shielding walls 15, 16. May extend.

Next, the grommet of 4th Embodiment is demonstrated.
FIG. 7 is a schematic perspective view of the grommet of the fourth embodiment, and FIG. 8 is a schematic cross-sectional view of the grommet in use.

  As shown in FIGS. 7 and 8, the grommet 310 of the fourth embodiment has a cylindrical portion 70. The cylindrical portion 70 is integrally provided between the inner peripheral end of the one connection shielding wall 15 and the small diameter cylindrical portion 11. The cylindrical portion 70 has a bellows shape in which a plurality of crest portions 71 and trough portions 72 extending in the circumferential direction are alternately formed in the axial direction, whereby the cylindrical portion 70 can be easily bent. ing. The cylindrical portion 70 has a length that can be bent so that the small-diameter cylindrical portion 11 at the end thereof easily faces downward, and has a length of, for example, 30 mm to 200 mm.

  The inner cylinder portion 21 extends to the other side in the axial direction (vehicle interior), and an end portion 21 a thereof is inserted inside the small-diameter cylinder portion 12 at the inner peripheral end of the connection shielding wall 16 while maintaining an annular gap 25. Has been. And the opening end 22 of the end portion 21b (this end portion corresponds to the position of the panel P) opposite to the side inserted into the inside of the small diameter cylindrical portion 12 at the inner peripheral end of the connection shielding wall 16 is The sound insulation space S is open.

  The sound insulation wall 20 is disposed inside the sound insulation space S, the outer peripheral end 20 a is connected to the inner periphery of the connection shielding wall 16 close to the large diameter cylindrical portion 13, and the inner peripheral end 20 b is connected to the inner cylindrical portion 21. Has been. The sound insulating wall 20 is formed in a flat plate shape, but may be formed as an annular corrugated wall. In this case, the corrugated shape is also included in the corrugated shape.

  Further, the grommet 310 has four slit portions 75 in the small diameter cylindrical portion 11 on the connection shielding wall 15 side, and similarly, four slit portions 76 are provided on the small diameter cylindrical portion 12 on the connection shielding wall 16 side. Have. The slit portions 75 and 76 are formed at equal intervals in the circumferential direction of the small-diameter cylindrical portions 11 and 12 and project outward in the radial direction. Slits SL are formed in the respective slit portions 75 and 76, and these slits SL are opened on the inner peripheral side. The grommet 310 is fixed to the wire harness W by tightening the small-diameter cylindrical portion 11 of the connecting shielding wall 15 and the small-diameter cylindrical portion 12 of the connecting shielding wall 16 together with the slit portions 75 and 76 with a tie band, tape 40, or the like. The

  In the grommet 310, the tubular part 70 is bent downward and extends long in the use state. Thereby, the cylindrical part 70 becomes the attitude | position in which the small diameter cylinder part 11 of the edge part (end part facing the to-be-watered environment, such as an engine room) hangs down, and between the electric wires Wa inside the small diameter cylinder part 11 Moisture does not easily enter due to a capillary phenomenon in the gap, and this portion corresponds to the water stop portion 80. In this case, since the water stop agent 31 is not used, the injection process of the water stop agent 31 can be omitted. In addition, you may fill the inside of the small diameter cylinder part 11 with the water stop agent 31, and in that case, the water stop effect is further improved. Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

FIG. 9 shows the relationship between the grommet 10 and the internal mold.
When manufacturing the grommet 310 of this embodiment, the internal metal mold | die which shape | molds the internal shape of the grommet 310 is divided into 2 in the axial direction on the sound insulation wall 20 as a boundary. A rod-shaped mold part TA2 that forms the inside of the inner cylinder part 21 is integrated with the main body part TA1 in the internal mold TA that is one split mold.

  Then, after the grommet 310 is molded, one of the two inner molds TA and TB is molded in one axial direction (arrow A direction) relative to the molded grommet 310. Unplug. Further, of the two internal molds TA and TB, the other internal mold TA is punched to the other axial side (arrow B direction) relative to the molded grommet 310. As described above, the grommet 310 as a molded product can be obtained. By extracting the inner molds TA and TB divided in this way from the grommet 310 in the opposite directions, it is possible to easily form the integral grommet 310 including the sound insulating wall 20.

  Further, when the internal dies TA and TB are extracted from the molded grommet 310, the slits SL of the slit portions 75 and 76 of the small diameter cylindrical portions 11 and 12 are widened, so that the internal dies TA and TB are easily extracted. be able to.

  When releasing the internal molds TA and TB, if the air is blown between the grommet 310 and the internal molds TA and TB to expand the grommet 310, the internal molds TA and TB can be more easily removed from the grommet 310. Can be pulled out.

  In addition, a front view, a rear view, a left side view, a right side view, a plan view, a bottom view, a perspective view, and a sectional view of the grommet 310 of this embodiment are shown in FIGS.

  The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like can be made as appropriate. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, in the above embodiment, the grommet provided with the inner cylinder portion 21 and the sound insulation wall 20 has been described, but the present invention can also be applied to a grommet in which the inner cylinder portion 21 is omitted. The grommet in that case has a large-diameter cylindrical portion and a connection shielding wall as in the first embodiment of FIG. 1, and has a small-diameter cylindrical portion at the inner peripheral ends of both the connection shielding walls. The gap between the wires of the wire harness and the gap between the wire and the inner circumference of the small-diameter cylindrical portion are sealed with a water-stopping agent in at least one small-diameter cylindrical portion of the two small-diameter cylindrical portions. Provide a stopped water stop. By comprising in this way, sound insulation and water stop can be given.

  In addition, the outer peripheral end is connected to the inner periphery of the connecting shield wall at or near the inner periphery of the large-diameter cylindrical portion, and the inner peripheral end is in close contact with the outer periphery of the wire harness. By providing a sound insulation wall that divides the space in the axial direction, the sound insulation can be further improved.

  Moreover, sound insulation can be further improved by changing the shape of the fitting part with the panel in the large diameter cylindrical part of the grommet. FIG. 18 is a modified example of the fitting portion fitted into the through hole of the panel. In the following description, for the sake of convenience, it is assumed that the connecting shielding wall 15 is located on the engine room side and the connecting shielding wall 16 is located on the vehicle compartment side. 16 may be the engine room side. In FIG. 18, the solid line indicating the shape of the grommet represents the shape of the grommet in a state where it is not fitted to the panel so that the shapes of the two lip portions described below can be easily understood.

The large-diameter cylindrical portion 13 of the grommet has an engine side wall 81 and a vehicle compartment side wall 82 that form an engagement groove 13a. The engine-side side wall 81 is formed with an engine-side lip portion 81 a that protrudes toward the vehicle compartment-side side wall 82, and the vehicle compartment-side side wall 82 protrudes toward the engine-side side wall 81. A lip portion 82a is formed.
When the grommet is fitted to the panel P, the panel P is pressed from the engine room side and the vehicle compartment side by the engine side lip portion 81a and the vehicle compartment side lip portion 82a, respectively. Thereby, the vibration of the panel P is suppressed and the transmitted sound which permeate | transmits the panel P can be reduced.

FIG. 19 shows another modification of the fitting portion fitted in the through hole of the panel. In this grommet, a lightening portion 83 is formed at the base of the engine side lip portion 81a.
As a result, the engine-side lip portion 81a is more likely to bend toward the engine room side than the case where the lightening portion 83 is not provided, and when the grommet is fitted into the panel P, the reaction of the engine-side lip portion 81a against the panel P occurs. The force is reduced, and the force required for assembly can be reduced.

  Furthermore, in either case of FIGS. 18 and 19, a silencer 85 formed of a sound insulating material may be attached to the periphery of the through hole formed in the panel P. In this case, since the outer peripheral edge of the engine-side lip portion 81a is located outside the inner peripheral edge of the silencer 85 in the radial direction of the grommet, that is, in the direction perpendicular to the axial direction, the sound insulation can be further enhanced. That is, as shown in FIGS. 18 and 19, the silencer 85 is not affixed and there is a portion where the panel P is exposed in a range of a predetermined length in the radial direction from the periphery of the through hole of the panel P. . By covering the exposed portion with the engine-side lip portion 81a, it is possible to reduce the transmitted sound from the space between the silencer 85 and the grommet to the passenger compartment side, and to improve the sound insulation.

Here, the features of the above-described grommets according to the present invention are summarized and listed in the following [1] to [11], respectively.
[1] The panel (P) is fixed to the wire harness (W) inserted through the through hole (Pa) of the panel (P), fitted into the through hole (Pa), and attached to the panel (P). P) Grommets (10, 110) for supporting the wire harness (W),
A large-diameter cylindrical portion (13) provided with a panel fixing portion (engagement groove 13a) fixed to the through hole (Pa);
Two small-diameter cylindrical portions (11, 12) that are arranged one on each side in the axial direction of the large-diameter cylindrical portion (13) and closely fit to the outer periphery of the wire harness (W) that passes through the through hole (Pa). )When,
Two connecting shielding walls (15, 16) defining an annular sound insulation space (S) between the large diameter cylindrical portion (13) and each small diameter cylindrical portion (11, 12);
Prevention of water intrusion into the sound insulation space (S) from at least one of the two small-diameter cylindrical portions (11, 12) through the small-diameter cylindrical portion (11) through the small-diameter cylindrical portion (11). A grommet (10, 110, 310) characterized in that a water stop (30, 80) is provided.
[2] The water stop portion (30) is a gap between the inner circumference of the small diameter cylindrical portion (11) and the electric wire of the wire harness (W) and a gap between the electric wire and the inner circumference of the small diameter cylindrical portion (11). The grommet (10, 110) according to [1], characterized in that the grommet is constituted by a water-stopping agent (31) for sealing.
[3] At least one small-diameter cylindrical portion (11) of the two small-diameter cylindrical portions (11, 12) includes a cylindrical portion (70) extending downward between the connection shielding wall (15). The grommet (310) according to [1] or [2], wherein the water stop portion (80) is configured by the cylindrical portion.
[4] The cylindrical portion (70) is formed in a bellows shape in which a plurality of crest portions (71) and trough portions (72) extending in the circumferential direction are alternately formed in the axial direction. The grommet (310) according to [3].
[5] The small-diameter cylindrical portions (11, 12) are provided with a plurality of slit portions (75, 76) having slits (SL) whose inner peripheral side is open at intervals in the circumferential direction. The grommet (310) according to any one of [1] to [4].
[6] Inside the sound insulation space (S), the outer peripheral end (20a) is connected to the inner periphery of the large diameter cylindrical portion (13) or the inner periphery of the connection shielding wall (15, 16) at a position close thereto. The sound insulation wall (20) for dividing the sound insulation space (S) in the axial direction is provided by the inner peripheral end (20b) being in close contact with the outer periphery of the wire harness (W). The grommet (10, 110, 310) according to any one of the above [1] to [5].
[7] The panel (P) is fixed to the wire harness (W) inserted through the through-hole (Pa) of the panel (P), fitted into the through-hole (Pa), and attached to the panel (P). P) Grommets (10, 110) for supporting the wire harness (W),
A large-diameter cylindrical portion (13) provided with a panel fixing portion (engagement groove 13a) fixed to the through hole (Pa);
The inner peripheral ends (small diameter cylindrical portions 11, 12) extending from the large diameter cylindrical portion (13) to both sides in the axial direction and gradually becoming smaller in diameter as the distance from the large diameter cylindrical portion (13) increases. Are arranged close to or in close contact with the outer periphery of the wire harness (W), and two connected shielding walls (15, 16) defining a sound insulation space (S) around the wire harness (W),
At least one end portion (21a, 21b) in the axial direction is inserted inside the inner peripheral end (small-diameter cylindrical portion 11, 12) of the connection shielding wall (15, 16), and on the outer periphery of the wire harness (W). An inner cylinder portion (21) to be closely fitted,
Provided inside the sound insulation space (S), the outer peripheral end (20a) is connected to the inner periphery of the large diameter cylindrical portion (13) or the inner periphery of the connection shielding wall (15, 16) at a position close thereto. A sound insulation wall (20) that divides the sound insulation space (S) in the axial direction by connecting the inner peripheral end (20b) to the inner tube portion (21);
A gap between the electric wires (Wa) of the wire harness (W) and the inner tube portion (21) and the inner tube portion (21) are fitted into the inner tube portion (21). A grommet (10, 110) characterized in that a water-stop portion (30) is provided in which a gap between the periphery and the periphery is sealed with a water-stop agent (31).
[8] The inner cylinder portion (21) continuously extends for the length of one half between the inner peripheral ends (small diameter cylinder portions 11, 12) of the two connection shielding walls (15, 16). The one end portion (21a) of the inner cylinder portion (21) is inserted inside the inner peripheral end (small diameter cylinder portion 11) of the one side connecting shielding wall (15), The grommet (10) according to the above [7], wherein the open end (22) of the other end (21b) of the cylindrical portion (21) is opened in the sound insulation space (S). .
[9] The inner cylinder portion (21) continuously extends over the entire length between both inner peripheral ends (small diameter cylinder portions 11, 12) of the two connection shielding walls (15, 16), Both end portions (21a, 21b) of the inner tube portion (21) are inserted into the inner peripheral ends (small diameter tube portions 11, 12) of the connection shielding walls (15, 16). The grommet (110) according to the above [7].
[10] The water stop portion (30) is closer to the noise generation side of both sides of the panel (P) in the axial direction than the panel fixing portion (engagement groove 13a) of the large diameter cylindrical portion (13). The grommet (10, 110) according to any one of [7] to [9], wherein the grommet (10, 110) is disposed at a close position.
[11] The panel (P) is fixed to the wire harness (W) inserted through the through hole (Pa) of the panel (P), fitted into the through hole (Pa), and attached to the panel (P). P) a grommet (210) for supporting the wire harness (W),
A large-diameter cylindrical portion (13) provided with a panel fixing portion (engagement groove 13a) fixed to the through hole (Pa);
The inner peripheral ends (small diameter cylindrical portions 11, 12) extending from the large diameter cylindrical portion (13) to both sides in the axial direction and gradually becoming smaller in diameter as the distance from the large diameter cylindrical portion (13) increases. Are arranged close to or in close contact with the outer periphery of the wire harness (W), and two connected shielding walls (15, 16) that define a sound insulation space (S) around the wire harness (W),
At least one end portion (21a, 21b) in the axial direction is inserted inside the inner peripheral end (small-diameter cylindrical portion 11, 12) of the connection shielding wall (15, 16), and on the outer periphery of the wire harness (W). An inner cylinder portion (21) to be closely fitted,
Provided inside the sound insulation space (S), the outer peripheral end (20a) is connected to the inner periphery of the large diameter cylindrical portion (13) or the inner periphery of the connection shielding wall (15, 16) at a position close thereto. A sound insulating wall (20) that divides the sound insulating space (S) in the axial direction by connecting the inner peripheral end (13b) to the inner cylindrical portion (21);
The end (21a) of the inner cylinder part (21) inserted inside the inner peripheral end (small diameter cylinder part 11) of the connection shielding wall (15) extends downward and allows water to enter from the outside. A grommet characterized in that an extension tube portion (20c) for preventing is provided.

10, 110, 210 Grommet 11, 12 Small diameter cylindrical part (inner peripheral end)
13 Large-diameter cylindrical part 13a Engaging groove (panel fixing part)
DESCRIPTION OF SYMBOLS 15,16 Connection shielding wall 20 Sound insulation wall 20a Outer peripheral end 20b Inner peripheral end 21 Inner cylinder part 21a, 21b End part 21c Extension cylinder part 22 Open end 30,60,80 Water stop part 31 Water stop agent 70 Cylindrical part 71 Mountain part 72 Valley part 75,76 Slit part S, S1, S2 Sound insulation space SL Slit P Panel Pa Through hole W Wire harness Wa Electric wire

Claims (11)

A grommet that supports the wire harness on the panel by being fixed to the wire harness inserted through the through-hole of the panel, fitted into the through-hole and attached to the panel,
A large-diameter cylindrical portion having a panel fixing portion fixed to the through hole;
Two small-diameter cylindrical portions that are arranged one by one on both sides in the axial direction of the large-diameter cylindrical portion, and are closely fitted to the outer periphery of the wire harness that is passed through the through hole;
Two connecting shielding walls that define an annular sound insulation space between the large-diameter cylindrical portion and each small-diameter cylindrical portion;
At least one small-diameter cylindrical portion of the two small-diameter cylindrical portions is provided with a water stop portion that prevents water from entering the sound insulation space from the outside via the small-diameter cylindrical portion. Grommet.   The water stop portion is constituted by a water stop agent that seals a gap between the inner circumference of the small diameter cylindrical portion and the wire of the wire harness and a gap between the electric wire and the inner circumference of the small diameter cylindrical portion. The grommet according to claim 1.   At least one small-diameter cylindrical portion of the two small-diameter cylindrical portions has a cylindrical portion extending downward between the connection shielding wall, and the water stop portion is configured by the cylindrical portion. The grommet according to claim 1 or 2, wherein the grommet is provided.   The grommet according to claim 3, wherein the cylindrical portion is formed in a bellows shape in which a plurality of crests and troughs extending in the circumferential direction are alternately formed in the axial direction.   The said small diameter cylinder part is provided with the some slit part which has the slit by which the inner peripheral side was open | released at intervals in the circumferential direction, The one of Claim 1 thru | or 4 characterized by the above-mentioned. Grommet.   In the sound insulation space, an outer peripheral end is connected to an inner periphery of the large-diameter cylindrical portion or an inner periphery of the connection shielding wall at a position close thereto, and an inner peripheral end is in close contact with the outer periphery of the wire harness. The grommet according to any one of claims 1 to 5, further comprising a sound insulation wall that divides the sound insulation space in the axial direction. A grommet that supports the wire harness on the panel by being fixed to the wire harness inserted through the through-hole of the panel, fitted into the through-hole and attached to the panel,
A large-diameter cylindrical portion having a panel fixing portion fixed to the through hole;
Extending from the large-diameter cylindrical portion to both sides in the axial direction, gradually decreasing in diameter as the distance from the large-diameter cylindrical portion is increased, and the inner peripheral end having the smaller diameter is disposed close to or in close contact with the outer periphery of the wire harness Two connected shielding walls defining a sound insulation space around the wire harness;
At least one end portion in the axial direction is inserted inside the inner peripheral end of the connection shielding wall, and an inner cylindrical portion that is closely fitted to the outer periphery of the wire harness;
Provided inside the sound insulation space, an outer peripheral end is connected to an inner periphery of the large-diameter cylindrical portion or an inner periphery of the connection shielding wall at a position close thereto, and an inner peripheral end is connected to the inner cylindrical portion. And having a sound insulation wall that partitions the sound insulation space in the axial direction,
The inner cylinder part is provided with a water-stop part in which a gap between the wires of the wire harness and the gap between the electric wire and the inner periphery of the inner cylinder part are sealed with a water-stopping agent. Grommet characterized by having.   The inner cylinder portion extends continuously in the length of one half between both inner peripheral ends of the two connection shielding walls, and one end portion of the inner cylinder portion is on one side. 8. The grommet according to claim 7, wherein the grommet is inserted into an inner peripheral end of the connection shielding wall, and an open end of the other end portion of the inner cylinder portion is opened in the sound insulation space. .   The inner cylinder portion continuously extends over the entire length between both inner peripheral ends of the two connection shielding walls, and both end portions of the inner cylinder portion are located inside the inner peripheral ends of the connection shielding walls. The grommet according to claim 7, wherein the grommet is inserted into the grommet.   The said water stop part is arrange | positioned in the position close | similar to the noise generation side of the both sides of the said panel in an axial direction rather than the panel fixing | fixed part of the said large diameter cylinder part. The grommet of any one of Claims. A grommet that supports the wire harness on the panel by being fixed to the wire harness inserted through the through-hole of the panel, fitted into the through-hole and attached to the panel,
A large-diameter cylindrical portion having a panel fixing portion fixed to the through hole;
Extending from the large-diameter cylindrical portion to both sides in the axial direction, gradually decreasing in diameter as the distance from the large-diameter cylindrical portion is increased, and the inner peripheral end having the smaller diameter is disposed close to or in close contact with the outer periphery of the wire harness Two connected shielding walls that define a sound insulation space around the wire harness;
At least one end portion in the axial direction is inserted inside the inner peripheral end of the connection shielding wall, and an inner cylindrical portion that is closely fitted to the outer periphery of the wire harness;
Provided inside the sound insulation space, an outer peripheral end is connected to an inner periphery of the large-diameter cylindrical portion or an inner periphery of the connection shielding wall at a position close thereto, and an inner peripheral end is connected to the inner cylindrical portion. A sound insulation wall that divides the sound insulation space in the axial direction,
An extension tube portion that extends downward and prevents water from entering from the outside is provided at an end portion of the inner tube portion that is inserted inside the inner peripheral end of the connection shielding wall. Grommet.

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