JPH06231643A - Grommet - Google Patents

Abstract

PURPOSE:To obtain a grommet which can be inserted to a panel easily and can be removed hardly, by installing an elastic member expanding to the peripheral direction to a wire to insert, and housing it to the housing of the main body, while holding the panel between the elastic member and a flange. CONSTITUTION:In order to install a grommet 1, at first, the cutting of an elastic member 9 is opened, a wire 3 is inserted, and it is fixed with an adhesive tape or the like at the engaging part 27. The wire 3 is inserted into a through hole 23 from the opening at the flange 19 side of the grommet main body 7, and an inserting member 29 is housed in a housing 25. Under such a condition, the main body 7 is inserted to the through hole 5a of a panel 5 from the inserting member 13 side, and pulled out. A swelling 17 is bent together with the inserting member 29 to the inner side, and a groove 15 is fitted to the hole 5a, and at the same time, the panel 5 is held by the member 9 and the flange 19 so as to fix the grommet 1. After that, the movement of the grommet 1 in the axial direction is blocked by the inserting member 29 of the member 9 and the flange 19, and the grommet 1 is hardly removed from the through hole 5a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring grommet (hereinafter referred to as a grommet) which can be easily mounted on a vehicle panel or the like.

[0002]

2. Description of the Related Art As conventional grommets of this type, for example, Japanese Utility Model Laid-Open No. 52-121699 and Japanese Utility Model Laid-Open No. 3-74.
There is one described in Japanese Patent No. 124.

A grommet 101 shown in FIG. 9 described in Japanese Utility Model Laid-Open No. 52-121699 has a ring portion 107 formed of an elastic rubber material or the like and fitted in a mounting hole 105 of a panel 103. A flange portion 109 is provided inside the panel 103 of the ring portion 107 (lower side in the figure), and a bulging portion 111 is provided outside the panel 103. The bulging portion 111 is formed into a curved surface shape that gently bulges in the outer diameter direction following the ring portion 107.
11 is provided with a cover portion 113, and the cover portion 11
3 is provided with a constriction 117 through which the wire harness 115 is inserted.

When mounting the grommet 101 in the mounting hole 105 of the panel 103, first the grommet 101 is fitted to the wire harness 115 and fixed by the narrowing portion 117,
In order to compress the flange portion 109 in the diameter reducing direction and push it into the hole from the outside of the mounting hole 105 so that the flange portion 109 can completely pass through the mounting hole 105, the bulging portion 111 is also temporarily reduced in the diameter reducing direction. It is compressed and pushed into the mounting hole 105, and then the grommet 101 is pulled back again to the position where the ring portion 107 fits into the mounting hole 105 of the panel 103. As a result, the flange 109 is attached to the mounting hole 10
The bulging portion 111 is attached to the mounting hole 105 by the restoring force of the bulging portion 111 which is in contact with the inner side of the bulge 5 and is compressed in the diameter reducing direction.
The grommet 101 is fitted and fixed to the mounting hole 105 at the outer side of the.

A grommet 121 shown in FIGS. 10 and 11 described in Japanese Utility Model Laid-Open No. 3-74124 is a grommet body 123 made of an elastic rubber material or the like.
And a spacer ring 125 formed of a flexible member such as synthetic resin.

The grommet body 123 has a panel fitting portion 127 on the large diameter side and a wire harness insertion portion 129 on the small diameter side.
And is formed into a substantially cup shape. An annular spacer ring fitting groove 131 is formed in the panel fitting portion 127 in a direction orthogonal to the vehicle panel 130, and an annular lip-shaped protrusion 13 is provided outside the spacer ring fitting groove 131.
3 is provided upright from the flange portion 135.

On the other hand, on the outer periphery of the spacer ring 125, the spacer ring fitting groove 13 of the grommet body 123 is formed.
A pressing fitting portion 137 having a triangular cross section with respect to 1 is formed, and a slit 139 is provided on a part of the circumference so that the spacer ring 125 can be opened in the circumferential direction from the slit 139.

When mounting the grommet 121 in the mounting hole 130a of the panel 130, first, the grommet main body 12
3 is inserted into the mounting hole 129a from the direction of arrow a. At this time, the lip-shaped projecting piece 133 is inserted into the spacer ring fitting groove 131.
Since it bends inside, it can be inserted easily.

Next, the slit 13 of the spacing 125 is divided.
9 is opened, the wire harness 141 is inserted into the spacer ring 125, and the spacer ring 125 is fitted into the spacer ring fitting groove 131 in the arrow b direction. At this time, since the spacer ring 125 bends the lip-shaped protrusion 133 outward, that is, in the direction of the arrow C, the lip-shaped protrusion 133 holds the panel 130 with the flange 135, and exerts a large fixing force. To do.

[0010]

However, the grommet 101 shown in FIG. 9 has the mounting hole 105 of the panel 103.
Insertion stroke Sa, that is, the bulging portion 11 when inserting into
Since the axial length of 1 is small, the ring portion 1
Although it has an advantage that insertion workability for inserting 07 is good, on the other hand, in the state where the grommet 101 is fitted and fixed in the mounting hole 105, the flange portion 1 is attached to the wire harness 115.
There is a problem that the grommet 101 is easily detached from the mounting hole 105 when a tensile force in the 09 direction (arrow D direction in FIG. 9) is applied. That is, when the tensile force in the direction of the flange portion 109 acts on the wire harness 115, the same force in the same direction also acts on the grommet 101, and the tensile force causes the bulging portion 111 to bend toward the inner diameter side. As a result, the grommet 101 may come out of the mounting hole 105.

On the other hand, the mounting hole 105 of the panel 103
It is conceivable to increase the wall thickness of the bulging portion 111 to increase the rigidity in order to give a fixing force to the. However, in this case, a large insertion force is required when the grommet 101 is fitted into the mounting hole 105. However, there was a problem that the insertion workability deteriorates.

The grommet 121 shown in FIGS. 10 and 11 exerts a great fixing force when the spacer ring 125 is fitted in the spacer ring fitting groove 131 of the grommet body 123, and therefore acts on the grommet 121. There is an advantage that a sufficient fixing force can be obtained with respect to the axial force, and the grommet 121 is hard to come off from the mounting hole 130a. However, the mounting hole 1 of the panel 130
When the grommet 121 is attached to the 30a, the grommet body 1 is in a state before the spacer ring 125 is fitted into the spacer ring fitting groove 131 of the grommet body 123.
There is a possibility that 23 may easily come off from the mounting hole 130a, and further, the step of fitting the spacer ring 125 in the grommet insertion work increases, so that the work becomes complicated.

The present invention has been made in view of the above problems, and an object thereof is to provide a grommet which has a good insertability into a through hole of a panel and is hard to come off.

[0014]

In order to solve the above problems, the present invention provides a grommet body having an insertion hole through which an electric wire is inserted, and a bulge portion formed by bulging on the outer periphery of the grommet body. In a grommet provided with a flange portion protruding from the grommet body and a groove portion formed between the flange portion and the bulging portion and fitted into a through hole of a panel, the inside of the bulging portion In addition, the accommodating portion that is recessed in the outer peripheral direction from the bottom surface of the groove portion is provided in communication with the insertion hole, and an elastic member that is accommodated in the accommodating portion and expands in the outer peripheral direction toward the groove portion is attached to the electric wire, It is characterized in that the panel is held by an elastic member and the flange portion.

[0015]

When the grommet is attached to the through hole of the panel, first, the electric wire is inserted into the elastic member and the elastic member is attached to the electric wire. Then, this is inserted into the insertion hole of the grommet main body, and the elastic member is accommodated in the accommodating portion from the small diameter side.

In this state, when the grommet body is fitted into the through hole from the bulging portion side and pulled toward the bulging portion, the bulging portion bends toward the inner diameter side and the elastic member in the accommodating portion also moves toward the inner diameter side. It is bent and fitted into the through hole. Further, the elastic member has a shape that expands in the outer peripheral direction toward the groove portion side, so that the insertability is good. When the groove is fitted to a position corresponding to the through hole, the grommet is fitted and fixed in the through hole of the panel due to the restoring force of the bulging portion that has been bent toward the inner diameter side and the elastic member.

That is, the grommet can be easily inserted into the through hole of the panel.

On the other hand, when the grommet is fitted and fixed in the through hole of the panel and a force is applied to the electric wire in the direction of the flange portion, the large diameter side of the elastic member that expands toward the groove portion in the outer peripheral direction is the grommet body. Bends to the outer diameter side in the housing portion of the, and prevents the grommet from moving toward the flange portion.

Further, with respect to the force acting on the electric wire in the direction of the bulging portion, the flange portion prevents the grommet from moving in the direction of the bulging portion.

Therefore, a sufficient fixing force can be obtained with respect to the axial force acting on the grommet, and the grommet is less likely to come off the through hole.

[0021]

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

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

As shown in FIG. 1, the grommet 1 has a grommet body 7 into which a wire (wire harness) 3 is inserted and which is fitted into a through hole 5a of the panel 5, and the wire 3
And an elastic member 9 which is attached to the grommet body 7 and is fitted into the grommet body 7.

The grommet body 7 is made of an elastic rubber material or the like, and is formed in a substantially cup shape having a panel fitting portion 11 on the large diameter side and an electric wire insertion portion 13 on the small diameter side as shown in FIG. And the panel 5 on the outer periphery of the panel fitting portion 11.
The groove portion 15 fitted into the through hole 5a is provided.
A bulging portion 17 is provided on the electric wire insertion portion 13 side of the groove portion 15, and a flange portion 19 is provided on the opposite side.

The bulging portion 17 is formed to have a curved surface that bulges gently in the outer diameter direction following the groove portion 15. The bulging portion 17 is followed by the cup portion 21, and further the cup portion 21 and the electric wire 3. An electric wire insertion portion 13 having an insertion hole 23 through which is inserted is provided.

Inside the bulging portion 17, an accommodating portion 25 expanding toward the groove portion 15 is formed so as to communicate with the insertion hole 23.

On the other hand, the elastic member 9 is made of a flexible material such as synthetic resin, and as shown in FIGS. 3 to 6, the electric wire engaging portion 27 on the small diameter side and the outer peripheral direction of the electric wire engaging portion 27. It is formed in a trumpet shape having a large-diameter-side fitting portion 29 that expands to. A slit 31 is provided on a part of the circumference of the elastic member 9, and the elastic member 9 can be opened in the circumferential direction by the slit 31. In addition, multiple locations on the circumference (3 locations in the figure)
A cutout 33 is provided in the cutout 33 and the cutout 31 and the cutout 33 allow the fitting portion 29 to easily bend toward the inner diameter side and the outer diameter side.

When mounting the grommet 1 in the through hole 5a of the panel 5, first, as shown in FIG. 7, the slit 31 of the elastic member 9 is opened to insert the electric wire 3 into the elastic member 9 to engage the electric wire. After being fixed to the electric wire 3 with the adhesive tape 35 or the like at the portion 27, the electric wire engaging portion 27 side is inserted into the insertion hole 23 from the opening of the grommet body 7 on the flange 19 side. As a result, the fitting portion 29 of the elastic member 9 is fitted into the housing portion 25 of the grommet body 7. Thereby, the elastic member 9
The insertion hole 23 is accommodated in the accommodation portion 25 in a state where the insertion hole 23 is expanded in the outer peripheral direction from the one end opening 23 a side toward the groove portion 15 side (flange portion 19 side).

Then, in this state, the grommet body 7 is fitted into the through hole 5a of the panel 5 from the electric wire insertion portion 13 side and the electric wire insertion portion 13 is pulled. As a result, the bulging portion 17 bends toward the inner diameter side, and the fitting portion 29 of the elastic member 9 in the accommodating portion 25 also fits inside the bending through hole 5a. At this time, the elastic member 9 is inserted into the through hole 5a from the electric wire engaging portion 13 side, which is the small diameter side, and the fitting portion 29 is easily bent to the inner diameter side, so that the insertability is good.

The groove portion 15 of the panel fitting portion 11 has the through hole 5a.
When it is fitted to a position corresponding to, the groove 15 is fitted into the through hole 5a of the panel 5 by the restoring force of the bulging portion 17 and the fitting portion 29 that have been bent toward the inner diameter side due to the fitting.
As shown in FIG. 1, the grommet 1 holds the panel 5 with the elastic member 9 and the flange portion 19 interposed therebetween.
Is fitted and fixed in the through hole 5a.

Therefore, the grommet 1 can be easily inserted into the through hole 5a of the panel 5, and the insertion workability can be improved.

On the other hand, the grommet 1 is attached to the through hole 5 of the panel 5.
When a tensile force in the direction of the flange portion 19 (direction of arrow e) acts on the electric wire 3 in a state of being fitted and fixed to a, that is, when a tensile force in the direction of arrow e acts on the grommet body 7, as shown in FIG. The fitting portion 29 of the elastic member 9 is easily bent to the outer diameter side within the accommodation portion 25 of the grommet main body 7. As a result, the fitting portion 29 of the elastic member 9 prevents the grommet 1 from moving toward the flange portion 19.

Further, the bulging portion 17 acting on the grommet 1
With respect to the pulling force in the direction (counter arrow e direction), the flange portion 19 prevents the grommet 1 from moving toward the bulging portion 17.

Therefore, a sufficient fixing force can be obtained with respect to the axial force acting on the grommet 1, and the grommet 1 becomes difficult to come off from the through hole 5a of the panel 5.

[0035]

As is apparent from the above description, according to the present invention, it is possible to obtain a grommet which has a good insertability into the through hole of the panel and is hard to come off.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing the grommet main body of FIG.

FIG. 3 is a perspective view showing an elastic member of FIG.

FIG. 4 is a front view showing the elastic member of FIG.

5 is a side view showing the elastic member of FIG. 1. FIG.

6 is a plan view showing the elastic member of FIG. 1. FIG.

FIG. 7 is a perspective view showing an assembled state of the grommet of FIG.

FIG. 8 is a cross-sectional view showing the action of the grommet of FIG.

FIG. 9 is a cross-sectional view showing a grommet according to a conventional example.

FIG. 10 is a sectional view showing a grommet according to another conventional example.

11 is a front view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 3 Electric wire 5 Panel 5a Through hole 7 Grommet main body 9 Elastic member 11 Panel fitting part 13 Electric wire insertion part 15 Groove part 17 Bulging part 19 Flange part 23 Insertion hole 25 Accommodating part 27 Electric wire engaging part 29 Fitting part 31 Cutting

Claims (1)

[Claims] 1. A grommet body having an insertion hole through which an electric wire is inserted, a bulging portion formed by bulging on the outer periphery of the grommet body, a flange portion protruding from the grommet body, and this flange. In a grommet provided with a groove portion formed between the bulging portion and the bulging portion and fitted into a through hole of the panel, a housing portion is provided inside the bulging portion and extends in the outer peripheral direction toward the groove portion. At the same time, an elastic member that is accommodated in the accommodating portion and expands in the outer peripheral direction toward the groove portion side is attached to the electric wire, and the panel is held by the elastic member and the flange portion.