JP2002186153A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can be easily and surely inserted and fitted into a through hole of a panel only by drawing an electric wire, and moreover can be used even where a space on the drawing side of the electric wire is small. SOLUTION: This is a grommet G1 provided with a large-diameter cylindrical part 1, having a fitting part 1a to the circumferential brim of a through hole of a panel; a small-diameter cylindrical part 2 into which the electric wire W to be made to penetrate through the through hole of the panel is inserted; and a screening wall 3 which close a space between this small-diameter part 2 and large-diameter part 1, by causing its internal circumferential end 3a to be continuous with the tip 2a of this small-diameter part 2, and causing its external circumferential end to be continuous with the large-diameter part 1. On a side closer to the tip than the tape wound part 10 of the small-diameter part 2, an annular protrusion 12 as a stopper for preventing the small-diameter part 2 from being reversed and creeping off the internal circumferential end 3a of the screening wall 3, by causing the small-diameter part 2 to thrust against the screening wall 3, when the small-diameter part 2 is drawn in its tip direction along with the electric wire W, is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for closing a gap between an electric wire and a panel when the electric wire is passed through a panel through hole.

[0002]

2. Description of the Related Art As a grommet of this kind, Japanese Utility Model Laid-Open No. 63
Japanese Unexamined Patent Publication No. 2327 is known. FIG.
Shows a structure in which a panel through portion of an electric wire (wire harness) W is closed using a grommet G11 similar to that described in the publication.

The grommet G11 includes a large-diameter cylindrical portion 1 having a fitting groove (fitting portion) 1a on the outer periphery of the through hole Pa of the panel P and an electric wire W passing through the panel through hole Pa.
Is provided with a small-diameter cylindrical portion 2 that passes through the inside thereof, and a shielding wall 3 that connects the large-diameter cylindrical portion 1 and the small-diameter cylindrical portion 2. When the grommet G11 is fitted into the panel through hole Pa, the electric wire W The wire W and the grommet G11 are fixed by projecting the tip of the small-diameter cylindrical portion 2 to the pulling side and winding the tape T around the tip.

The grommet G11 is inserted into the panel through hole Pa.
When the electric wire W is pulled in the direction of the arrow A and the force is transmitted to the grommet G11, the fitting groove 1a of the large-diameter cylindrical portion 1 is fitted to the peripheral edge of the panel through-hole Pa.

However, in the case of the grommet G11, since the tape winding portion 10 is on the pulling side of the electric wire W, the dimension X from the panel P to the bent portion of the electric wire W is large, and when the grommet G11 is mounted on a vehicle, the peripheral space becomes small. If it is small, there is a problem that it is likely to interfere with other parts.

Therefore, in order to reduce the dimension X from the panel P to the bent portion of the electric wire W, as shown in FIG. 6, a grommet G12 having a tape winding portion 10 provided on the side opposite to the pulling side of the electric wire W is provided. It is considered.

FIGS. 7A to 7C show a procedure for fitting the grommet G12 into a panel through hole (not shown).

First, the structure of the grommet G12 will be described in detail. The grommet G12 has a thick large-diameter cylindrical portion 1 having a fitting groove 1a with respect to the periphery of the panel through-hole, and an electric wire W passing through the panel through-hole. A small-diameter cylindrical portion 2 through which the inner peripheral end 3 is attached
a is continuous, and the outer peripheral end 3b is continuous with the distal end side of the large-diameter tubular portion 1 to provide a shielding wall 3 that blocks the space between the small-diameter tubular portion 2 and the large-diameter tubular portion 1.

The rear end 2b of the small-diameter cylindrical portion 2 extends to the side opposite to the side on which the electric wire W is pulled when the grommet G12 is fitted into the panel through hole. The grommet G12 can be fixed to the electric wire W by winding the tape T from the outer periphery around the portion 10.

When the conventional grommet G12 is used, first, as shown in FIG. 7A, an electric wire W is passed through the small-diameter cylindrical portion 2, and then a tape T is wound around the outer periphery of the tape winding portion 10.
To fix the small-diameter cylindrical portion 2 to the electric wire W. next,
In this state, pass the end of the electric wire W through the panel through hole, and
Is pulled in the direction of arrow A (the end direction of the small-diameter cylindrical portion 2), and the fitting groove 1a of the large-diameter cylindrical portion 1 of the grommet G12 is fitted into the panel through hole.

[0011]

However, the electric wire W is connected to A
When the grommet G12 is fitted into the panel through-hole while being pulled in the direction, as shown in FIG. 7B, the thin small-diameter cylindrical portion 2 pulled in the distal direction together with the electric wire W is made flexible by itself. In the worst case, the inner peripheral end 3a of the shielding wall 3 is turned over,
As shown in (c), the tape T is peeled off from the small-diameter tube portion 2 due to the small-diameter tube portion 2 completely coming out to the opposite side of the shielding wall 3, and the grommet G12 and the electric wire W are released. As a result, there is a possibility that the grommet G12 cannot be easily and securely fitted into the panel through hole.

In consideration of the above circumstances, the present invention can be easily and securely fitted into a panel through-hole only by pulling an electric wire, and can be used even in a place where the space on the pulling side of the electric wire is not large. It is intended to provide a grommet that can be used.

[0013]

According to the first aspect of the present invention, there is provided a large-diameter cylindrical portion having a fitting portion to a peripheral edge of a panel through-hole, and a small-diameter cylindrical portion through which an electric wire passing through the panel through-hole passes. A grommet provided with a shielding wall that closes a space between the small-diameter tube portion and the large-diameter tube portion because the inner peripheral end is continuous with the distal end of the small-diameter tube portion and the outer peripheral end is continuous with the large-diameter tube portion. At
A stopper for preventing the small-diameter tube portion from sneaking through the inner peripheral end of the shielding wall while being turned upside down when the small-diameter tube portion, together with the electric wire, is abutted against the shielding wall when pulled in the distal direction. Is provided.

According to the grommet of the present invention, the small-diameter tubular portion is fitted in the panel through hole by pulling the small-diameter tubular portion together with the electric wire toward the front end thereof. In addition, since the stopper provided on the small-diameter cylindrical portion abuts on the shielding wall, it is possible to prevent the small-diameter cylindrical portion from being turned over and slipping through the inner peripheral end of the shielding wall. In other words, the stopper abuts against the shielding wall, so that the pulling force applied to the electric wire is reliably transmitted from the shielding wall to the large-diameter cylindrical portion, and as a result, the grommet can be fitted simply by pulling the electric wire. It can be done easily and reliably.

[0015] Also, by the stopper hitting the shielding wall,
When the tape is wound, unnecessary force is not applied to that part, and the small-diameter cylindrical part does not slip through while turning over on the opposite side of the shielding wall, so the tape does not peel off from the small-diameter cylindrical part, The fixed state of the wire and the grommet can be reliably maintained.

The grommet can be used even when there is no space on the pulling side because the small-diameter cylindrical portion does not protrude on the pulling side of the electric wire.

According to a second aspect of the present invention, there is provided the grommet according to the first aspect, wherein a tape winding portion is provided at a rear end of the small-diameter cylindrical portion so that a tape is wound around the outer circumference together with the electric wire to be fixed to the electric wire. An annular projection is provided on the outer periphery of the small-diameter cylindrical portion on the tip side of the tape winding portion as the stopper.

When using the grommet of the present invention,
First, after passing the electric wire through the small-diameter cylindrical portion, a tape is wound around the outer periphery of the tape winding portion, and the small-diameter cylindrical portion is fixed to the electric wire. Next, in this state, the grommet is fitted into the panel through-hole while pulling the electric wire toward the distal end of the small-diameter cylindrical portion. At this time, the small-diameter cylindrical portion pulled in the distal direction together with the electric wire tries to sneak in while turning over the inner peripheral end of the shielding wall, but the annular convex portion (stopper) provided on the outer periphery on the distal end side of the tape winding portion ) Abuts against the shielding wall, thereby preventing the small-diameter cylindrical portion from slipping over (ie, turning over) further, and preventing the small-diameter cylindrical portion from completely slipping into the opposite side of the shielding wall. . As a result, peeling of the tape can be prevented, and the grommet and the electric wire can be reliably fixed.

The annular projection provided as a stopper has
Since it hits the entire circumference of the shielding wall in a well-balanced manner, the pulling force applied to the electric wire can be transmitted to the large-diameter cylindrical portion through the annular convex portion and the shielding wall in a well-balanced manner, and the grommet fits into the panel through hole. Wearing work can be performed smoothly.

According to a third aspect of the present invention, there is provided the grommet according to the first aspect, wherein a diameter of the small-diameter cylinder is larger (larger) than that of the small-diameter cylinder at the rear end of the small-diameter cylinder. A cup portion for filling a water-stopping material for filling a gap between electric wires passing through the portion is provided.

When using the grommet of the present invention,
First, after passing the electric wire through the small-diameter tube, the molten water-stopping material is filled into the filling cup portion, the water-stopping material is spread over the gap between the wires, and the hardened water-stopping material is used to fill the gap between the wires. . Then, after penetrating the end of the grommet-equipped wire in this state through the panel through-hole, the grommet is fitted into the panel through-hole while pulling the wire in the direction of the tip of the small-diameter cylindrical portion.
At this time, the small-diameter cylindrical portion pulled in the distal direction together with the electric wire tries to sneak in while turning over the inner peripheral end of the shielding wall, but the filling cup portion having a larger diameter than the small-diameter cylindrical portion is attached to the shielding wall. By abutting, it is possible to prevent the small-diameter cylindrical portion from going under (ie, turned over).

[0022] As the filling cup abuts on the shielding wall, the pulling force applied to the electric wire is reliably transmitted from the shielding wall to the large-diameter cylindrical portion. As a result, the grommet is fitted. The work can be performed reliably and easily only by pulling the electric wire. In particular, since the portion that fulfills the stopper function is the cup portion for filling the water-stopping material, it can be useful when the gap between the electric wires is securely sealed.

Further, since the filling cup abuts on the shielding wall, the small-diameter cylindrical portion no longer turns over, so that an unnecessary force such as peeling off the waterproof material filling the gap between the electric wires is applied. Therefore, reliable sealing performance can be maintained.

Further, this grommet has a water-stopping material filling cup on the side opposite to the pulling side of the electric wire, and a small-diameter cylindrical portion does not protrude on the pulling side of the electric wire, so that there is no space on the pulling side. Can also be used.

[0025]

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

FIG. 1 is a cross-sectional view showing the structure of the grommet G1 of the first embodiment, and FIGS. 2A and 2B are explanatory views of the operation when the grommet G1 is fitted into a panel through hole.

The grommet G1 is provided with a thick large-diameter cylindrical portion 1 having a fitting groove (fitting portion) 1a for a peripheral edge of a panel through hole (not shown), and is coaxially arranged inside the large-diameter cylindrical portion 1. And a thin-walled small-diameter tubular portion 2 through which an electric wire (wire harness) W penetrating through the panel through-hole passes, an inner peripheral end 3a is continuous with a tip 2a of the small-diameter tubular portion 2, and an outer peripheral end 3b
Is provided with a shielding wall 3 which is continuous with the distal end side of the large-diameter cylindrical portion 1 to close a space between the small-diameter cylindrical portion 2 and the large-diameter cylindrical portion 1. The shielding wall 3 is formed in a conical wall shape whose diameter is reduced toward the rear end 2 b of the small-diameter cylindrical portion 2.

The rear end 2b of the small-diameter cylindrical portion 2 extends to the side opposite to the side on which the electric wire W is pulled when the grommet G1 is fitted into a panel through hole (not shown). The grommet G1 is fixed to the electric wire W by winding the tape T around the outer periphery of the portion 10. When the small-diameter cylindrical portion 2 is pulled toward the distal end of the small-diameter cylindrical portion 2 together with the electric wire W on the outer periphery of the small-diameter cylindrical portion 2 closer to the distal end side than the tape winding portion 10, the small-diameter cylindrical portion 2 is brought into contact with the shielding wall 3. An annular convex portion 12 as a stopper for preventing the shield wall 3 from slipping through the inner peripheral end 3a of the shielding wall 3 while being turned upside down.
Is provided.

When holding the electric wire W by using the grommet G1, first, as shown in FIG. 2A, the electric wire W is passed through the small-diameter cylindrical portion 2, and then the tape W is wound around the outer periphery of the tape winding portion 10. T is wound to fix the small-diameter cylindrical portion 2 to the electric wire. Next, while pulling the electric wire W in the direction of the arrow A in that state,
The grommet G1 is fitted into the panel through hole.

At this time, the arrow A in FIG.
As shown in FIG. 2B, the small-diameter cylindrical portion 2 which is pulled in the direction tries to pass through the inner peripheral end 3a of the shielding wall 3 while turning over the inner peripheral end 3a. When the annular convex portion (stopper) 12 provided on the bottom wall abuts against the shielding wall 3, it is possible to further prevent the small-diameter cylindrical portion 2 from slipping under (ie, turning over), and the small-diameter cylindrical portion 2 is completely covered with the shielding wall 3. Can be prevented from escaping to the opposite side.
As a result, peeling of the tape T can be prevented,
The grommet G1 and the electric wire W can be securely fixed.

Further, since the annular convex portion 12 abuts on the shielding wall 3, the tensile force applied to the electric wire W is transmitted from the shielding wall 3 to the large-diameter cylindrical portion 1 without fail. The fitting operation can be easily and reliably performed only by pulling the electric wire W. Especially in that case,
Since the annular projection 12 provided as a stopper strikes the entire circumference of the shielding wall 3 in a well-balanced manner, the tensile force applied to the electric wire W is applied to the large-diameter cylinder via the annular projection 12 and the shielding wall 3. It can be transmitted to the portion 1 in a well-balanced manner, and the work of fitting the grommet G1 into the panel through hole can be performed smoothly.

In the grommet G1, the small-diameter cylindrical portion 2 does not protrude on the pulling side of the electric wire W. That is, since the tape winding portion 10 is provided on the side opposite to the pulling side of the electric wire W, It can also be used when there is no space in it.

Next, a second embodiment of the present invention will be described.

FIG. 3 is a sectional view showing the structure of the grommet G2 of the second embodiment, and FIGS. 4A and 4B are explanatory views of the operation when the grommet G2 is fitted into a panel through hole.

The grommet G2 is different from the grommet G1 of the first embodiment in that the grommet G2 has a rear end 2b
Instead of providing the tape winding portion 10 as in the first embodiment, the tape winding portion 10 is made larger in diameter (larger diameter) than the small-diameter cylindrical portion 2 and fills the gap of the electric wire W passed through the small-diameter cylindrical portion 2. Is provided so as to function as a stopper for preventing the small-diameter cylindrical portion 2 from slipping out of the small-diameter cylindrical portion 2 described above. Other points are the same as in the first embodiment, and a detailed description will be omitted.

When the grommet G2 is used, first, an electric wire is passed through the small-diameter cylindrical portion 2, and then the water-stopping material S in a molten state is used.
Is filled in the filling cup portion 22, the water-stopping material S is spread over the gap between the electric wires W, and the hardened water-stopping material S fills the gap between the electric wires W.

Then, after the tip of the wire W with the grommet G2 in this state is made to penetrate through the panel through hole, FIG.
As shown in (2), the grommet G2 is fitted into the panel through-hole while pulling the electric wire W in the direction of the arrow A of the small-diameter cylindrical portion 2.

At this time, the small-diameter cylindrical portion 2 pulled in the direction of the arrow A together with the electric wire W tries to pass through the inner peripheral end 3a of the shielding wall 3 while turning over, as shown in FIG. In addition, since the filling cup portion 22 having a diameter larger than that of the small-diameter cylindrical portion 2 abuts on the shielding wall 3, it is possible to prevent the small-diameter cylindrical portion 2 from slipping over (ie, turning over).

As described above, the filling cup portion 22 serves as the shielding wall 3
, The tensile force applied to the electric wire W is reliably transmitted from the shielding wall 3 to the large-diameter cylindrical portion 1.
Therefore, the work of fitting the grommet G2 can be performed reliably and easily only by pulling the electric wire W. In addition, since the portion that performs the stopper function is the cup portion 22 for filling the water stopping material S, the gap between the electric wires W can be reliably sealed.

Further, since the filling cup portion 22 abuts against the shielding wall 3, the small-diameter cylindrical portion 2 is no longer turned over, so that the water-stopping material S filling the gap of the electric wire W is peeled off. Unnecessary force is not applied, and reliable sealing performance can be maintained.

The grommet G2 has a cup portion 22 for filling the water-stopping material S on the side opposite to the pulling side of the electric wire W, and the small-diameter cylindrical portion 2 does not protrude on the pulling side of the electric wire W. Can be used even if there is no space on the side.

[0042]

As described above, according to the first aspect of the present invention, the provision of the stopper in the small-diameter cylindrical portion ensures that the tensile force applied to the electric wire is transmitted from the shielding wall to the large-diameter cylindrical portion. The grommet fitting operation can be performed easily and reliably. Further, since the small-diameter cylindrical portion does not protrude on the pulling side of the electric wire, it is useful when there is no space on the pulling side of the electric wire. In addition, the presence of the stopper prevents the small-diameter tubular portion from being sneaked through while turning over on the opposite side of the shielding wall when the wire is pulled. , The tape does not come off from the small diameter cylinder,
The fixed state of the wire and the grommet can be reliably maintained.

According to the second aspect of the present invention, the annular convex portion provided on the outer periphery of the small-diameter cylindrical portion as a stopper hits the sound insulating wall, thereby preventing the small-diameter cylindrical portion from slipping through the inner peripheral end of the sound insulating wall. Can be prevented, and the grommet and the electric wire can be securely fixed. In addition, since the annular convex portion strikes the entire circumference of the shielding wall in a well-balanced manner, the tensile force applied to the electric wire can be transmitted to the large-diameter cylindrical portion in a well-balanced manner, and the work of fitting the grommet into the panel through hole can be performed smoothly. Can be done.

According to the third aspect of the present invention, since the water-stopping material filling cup portion provided at the rear end of the small-diameter cylindrical portion prevents the small-diameter cylindrical portion from slipping through the inner peripheral end of the sound insulating wall, the electric wire can be used. The applied pulling force can be reliably transmitted from the shielding wall to the large-diameter cylindrical portion, and the work of fitting the grommet can be performed reliably and simply by pulling the electric wire. In particular, since the portion that fulfills the stopper function is the cup portion for filling the water-stopping material, it is useful for securely sealing the gap between the electric wires.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a grommet according to a first embodiment of the present invention.

FIGS. 2 (a) and 2 (b) are operation explanatory diagrams when the grommet of the first embodiment is fitted into a panel through-hole.

FIG. 3 is a cross-sectional view illustrating a configuration of a grommet according to a second embodiment of the present invention.

FIGS. 4A and 4B are explanatory diagrams of an operation when the grommet according to the second embodiment is fitted into a panel through-hole.

FIG. 5 is a diagram showing a state in which a panel penetrating portion of an electric wire W is closed using a conventional grommet.

FIG. 6 is a view showing a state in which a panel through portion of an electric wire W is closed using another conventional grommet.

FIGS. 7 (a) to 7 (c) are views showing a procedure for fitting the grommet of FIG. 6 into a panel through hole.

[Explanation of symbols]

 G1, G2 Grommet 1 Large-diameter cylindrical part 1a Fitting groove (fitting part) 2 Small-diameter cylindrical part 2a Tip 2b Rear end 3 Shielding wall 3a Inner peripheral end 3b Outer peripheral end 10 Tape winding part 12 Annular convex part (stopper) 22 Stop Water material filling cup (stopper) S Waterproof material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 3/38 H02G 3/28 FF Term (Reference) 3J040 AA01 AA13 BA01 EA01 EA16 EA22 FA05 HA15 5G333 AA09 AB16 AB27 AB29 CB20 EA02 5G357 DA02 DB03 DC12 DD01 DD05 5G363 AA01 AA16 BA02 CA05 CB08 DC02

Claims (3)

[Claims] 1. A large-diameter cylindrical portion having a fitting portion to a peripheral edge of a panel through-hole, a small-diameter cylindrical portion through which an electric wire penetrating through the panel through-hole passes, and an inner peripheral end provided at an end of the small-diameter cylindrical portion. Are continuous, and the outer peripheral end is continuous with the large-diameter cylindrical portion.In a grommet provided with a shielding wall that blocks a space between the small-diameter cylindrical portion and the large-diameter cylindrical portion, the small-diameter cylindrical portion includes an electric wire. A stopper is provided to prevent the small-diameter cylindrical portion from slipping through the inner peripheral end of the shielding wall by abutting on the shielding wall when the small-diameter cylindrical portion is pulled in the distal direction, thereby turning the small-diameter cylindrical portion upside down. And grommet. 2. The grommet according to claim 1, wherein a tape winding portion fixed to the electric wire is provided at a rear end of the small-diameter cylindrical portion by winding a tape around an outer periphery together with the electric wire, and the stopper serves as the stopper. A grommet characterized in that an annular convex portion is provided on the outer periphery of a small-diameter cylindrical portion on the tip side of a tape winding portion. 3. The grommet according to claim 1, wherein at a rear end of the small-diameter cylindrical portion, the stopper has a gap larger than that of the small-diameter cylindrical portion and an electric wire passing through the small-diameter cylindrical portion. A grommet characterized by providing a cup portion for filling a water-stopping material for filling.