JPH06231642A - Grommet - Google Patents

Abstract

PURPOSE:To obtain a grommet for wiring which can be inserted easily and removed hardly, by providing a thick part and a recess part at the inner side of an elastic swelling formed on the outer periphery of a main body, and permitting the bending of the elastic swelling to the inner side to the inserting force to a panel, while suppressing it to the reverse inserting force. CONSTITUTION:When a grommet is installed to a panel, a wire inserting part 7 to which a wire harness 3 is inserted is grasped and pulled from the lower side to the upper side to the through hole of the panel. The outer diameter taper part 19 of an elastic swelling 9 is pressed by the peripheral edge of the through hole, a thick part 21 is separated from an inner wall 15a, a recess part 23 is expanded, and the swelling 9 can be bent to the inner diameter side easily. When a groove 15 is fitted to the through hole, the swelling 9 is restored and fixed to the panel. Even though a reverse inserting force in the reverse direction is operated to the swelling 9 after that, the recess part 23 is narrowed, and the thick part 21 is abutted to the inner wall 15a, so as to suppress the bending of the swelling 9 to the inner diameter side. The movement of the grommet 1 can be blocked, consequently.

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 Conventional grommets of this type include, for example, Japanese Utility Model Publication No. 52-121699 and Japanese Utility Model Publication No. 63-1.
There is one such as that described in Japanese Patent No. 3355.

A grommet 101 shown in FIG. 6 described in Japanese Utility Model Laid-Open No. 52-121699 has a ring portion 107 which is formed of an elastic rubber material or the like and fits into 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 1 is provided outside the panel 103 of the ring portion 107.
11 is provided. The bulging portion 111 is the ring portion 10.
7 is formed into a curved surface shape that gently bulges in the outer diameter direction, a swelling portion 111 is provided with a cover portion 113, and a cover portion 113 is provided with a narrowing portion 117 into which the wire harness 115 is inserted. Has been.

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 109 fits into the mounting hole 105 of the panel 103. As a result, the flange 109 is attached to the mounting hole 10
5 is in contact with the inner side of the bulge 5, and the restoring force of the bulging portion 111 that has been compressed in the diameter reducing direction causes the bulging portion 111 to attach to the mounting hole 10.
5, the grommet 101 is attached to the outside of the mounting hole 105.
Is fitted and fixed to.

The grommet 121 shown in FIG. 7 described in Japanese Utility Model Laid-Open No. 63-13355 is made of an elastic rubber material or the like, and has a panel through hole 1 in a vehicle panel 123.
And a tubular body portion 131 having a support hole 129 through which the wire harness 127 is inserted.
The elastic fitting portion 135 is bent back from the end portion of the first body 1 to the outside in the radial direction of the tubular body portion 131 via the bent portion 133 having a substantially U-shaped cross section.

The elastic fitting portion 135 has a panel through hole 12
5, the concave groove 137 provided on the outer circumference so as to be fitted to the edge 125a, and the taper outer surface portion 139 whose diameter decreases from the portion where the concave groove 137 is provided toward the bent portion 133.
And an annular inward projection 141 provided on the inner circumference, and a portion where the annular inward projection 141 is formed from the panel through hole 125.
And a flange 143 extending outward in the radial direction.

On the other hand, on the outer periphery of the cylindrical body 131, a portion of the cylindrical body 131 which is contracted from the annular inward projection 141 in the direction of the bent portion 133 overlaps the annular inward projection 141 in the axial direction of the cylindrical body 131. Formed annular outward protrusion 145
Is equipped with.

When the grommet 121 is mounted in the panel through hole 125, the grommet 121 is first attached to the panel through hole 12.
Push in 5. When the grommet 121 is pushed in, the tapered outer surface portion 139 slides on the inner peripheral surface 125b of the panel through hole 125, and the elastic fitting portion 135 is compressed in the diameter reducing direction according to the fitting amount. When the concave groove 137 is fitted into the panel through hole 125 to a position corresponding to the edge 125a of the panel through hole 125, the concave groove 137 is compressed by the restoring force of the elastic fitting portion 135 which is compressed in the diameter reducing direction. The edge 137 and the edge 125 a of the panel through hole 125 are engaged with each other. As a result, the grommet 121 is fitted and fixed in the panel through hole 125.

[0009]

However, the grommet 101 shown in FIG. 6 has the mounting hole 105 of the panel 103.
Since the insertion stroke Sa at the time of fitting into the mounting hole 105, that is, the length in the axial direction of the bulging portion 111 is small, it has an advantage that the workability of inserting the ring portion 107 into the mounting hole 105 is good. When the pulling force is applied to the wire harness 115 in the direction of the flange portion 109 (the direction of arrow a in FIG. 6) in a state where the wire harness 115 is fitted and fixed, there were. That is, when a tensile force in the direction of the flange portion 109 acts on the wire harness 115, a tensile force of the same magnitude in the same direction also acts on the grommet 101, and this tensile force causes the bulging portion 1 to move.
There is a possibility that the grommet 101 may be bent out of the mounting hole 105 due to the bending of the grommet 11 toward the inner diameter side.

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.

In the grommet 121 shown in FIG. 7, a pulling force in the direction of the flange 143 (direction of arrow b in FIG. 7) acts on the grommet 121 via the wire harness 127 in a state of being fitted and fixed in the panel through hole 125. At this time, the annular outward projection 145 engages with and presses the annular inward projection 141, and the annular inward projection 141 is pressed,
The elastic fitting portion 135 is expanded outward in the radial direction of the panel through hole 125, and the concave groove 137 is attached to the inner peripheral surface 125b of the panel through hole 125.

Therefore, the grommet 121 is attached to the panel 12
3 has the advantage that it is firmly held against 3 and does not easily come off from the panel through hole 125, but on the other hand, the insertion stroke Sb when inserting into the panel through hole 125 of the panel 123, that is, the axial length of the elastic bulging portion 135. Is larger than the insertion stroke Sa of the grommet 101 shown in FIG. 6 (Sa <
Therefore, there is a problem that a large insertion force is required when fitting the grommet 121 into the panel through hole 125, and the insertion workability is poor.

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 which is difficult to be removed from the panel after being attached.

[0014]

SUMMARY OF THE INVENTION 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 hollow elastic body formed by bulging on the outer periphery of the grommet body. A bulging portion, a flange portion protruding from one end side of the elastic bulging portion, and a groove portion formed between the flange portion and the elastic bulging portion and fitted into a through hole of the panel. In the grommet which is inserted into the through hole from the elastic bulging portion side and attached to the panel,
A thick portion is provided inside the elastic bulge portion, and the thick portion has
A recess is provided to allow the elastic bulging portion to bend inward due to the insertion force and to suppress the elastic bulging portion to bend inward due to a counter insertion force.

[0015]

When the grommet is attached to the through hole of the panel, the grommet is inserted into the through hole from the elastic bulging portion side and then pulled in the inserting direction. When the grommet is pulled in the insertion direction, an insertion force acts on the elastic bulging portion, and the inner diameter side of the elastic bulging portion tries to enter the through hole of the panel. At this time,
Since the concave portion allows the elastic bulging portion to bend toward the inner diameter side, the elastic bulging portion is easily fitted to the inner diameter side into the bending through hole.

When the groove portion of the elastic bulging portion is inserted until it corresponds to the inner peripheral surface of the through hole, the grommet is fitted into the through hole of the panel by the restoring force of the elastic bulging portion that has been bent toward the inner diameter side. Fixed together.

That is, the grommet can be easily attached to the panel with a small insertion force.

On the other hand, when the wire harness tries to move in the direction of the flange with the grommet fitted and fixed in the through hole of the panel, an anti-insertion force acts on the elastic bulging portion, so that the inner diameter side of the elastic bulging portion is displaced. It moves in the insertion direction and tries to enter the insertion hole. However, when the anti-insertion force acts on the elastic bulging portion, the inward bulging of the elastic bulging portion is suppressed by the recess, so that the grommet is prevented from moving in the anti-inserting direction.

Further, when a force in the inserting direction acts on the wire harness in this state, the flange portion prevents the grommet from moving toward the elastic bulging portion.

That is, a sufficient fixing force can be obtained against the axial force acting on the grommet, and the grommet is unlikely to come off from 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 main body 1 is formed of an elastic rubber material or the like, and has a cylindrical wire insertion portion 7 having an insertion hole 5 into which a wire harness (electric wire) 3 is inserted, and this wire insertion portion. The hollow elastic bulging portion 9 is formed by bulging from the peripheral surface of the intermediate portion of the portion 7.

The elastic bulging portion 9 is formed from a groove portion 15 provided on the outer periphery so as to fit into a through hole 13 narrowed in the vehicle panel 11 by burring or the like, and from a portion where the groove portion 15 is provided. The through hole 13 is provided with a flange portion 17 projecting outward in the radial direction, and a tapered outer surface portion 19 whose diameter is reduced from the portion where the groove portion 15 is provided toward the upper surface of the elastic bulging portion 9. The outer diameter of the flange portion 17 is larger than that of the tapered outer surface portion 19.

A thick portion 21 is provided inside the tapered outer surface portion 19 of the elastic bulge portion 9. An annular recess 23 is formed in the thick portion 21 along the inner wall 15a of the groove 15 in substantially the same direction as the insertion hole 5.

When attaching the grommet 1 to the through hole 13 of the panel 11, as shown in FIG. 2, the grommet 1 is inserted into the through hole 13 of the panel 11 from the elastic bulging portion 9 side, and the wire harness 3 is inserted. The electric wire insertion part 7 is pulled in the insertion direction (direction of arrow C in FIG. 2). Wire insertion part 7
When is pulled in the insertion direction, an insertion force acts on the elastic bulging portion 9, and as shown in FIG.
The inner diameter portion 9a of the elastic bulging portion 9 is pulled in the insertion direction and tries to enter the through hole 13 in a state of being located at the peripheral edge of the. Therefore, the thick portion 21 is separated from the inner wall 15a of the groove portion 15, the concave portion 23 is expanded, and the elastic bulging portion 9 is easily bent toward the inner diameter side. Then, the tapered outer surface portion 19 of the elastic bulging portion 9 slides on the inner peripheral surface 13 a of the through hole 13 and is easily fitted into the through hole 13.

When the groove portion 15 of the elastic bulging portion 9 is fitted to a position corresponding to the inner peripheral surface 13a of the through hole 13, due to the restoring force of the elastic bulging portion 9 which is bent toward the inner diameter side with the fitting. , The groove 15 is fitted into the through hole 13 of the panel 11,
As shown in FIG. 3, the grimmet 1 is attached to the through hole 13 of the panel 11.

Therefore, the grommet 1 can be easily inserted into the through hole 13 of the panel 11 with a small insertion force, and the insertion workability can be improved.

On the other hand, when the grommet 1 is fitted and fixed in the through hole 13 of the panel 11 and a tensile force in the direction opposite to the insertion direction (arrow D direction) acts on the wire harness 3 as shown in FIG. The anti-insertion force acts on the projecting portion 9, and the inner diameter portion 9 a of the elastic bulging portion 9 tries to enter the through hole 13.
However, when such an anti-insertion force acts on the elastic bulging portion 9, the concave portion 23 is narrowed, the thick portion 21 abuts the inner wall 15a of the groove portion 15, and the thick portion 21 causes the inner diameter of the elastic bulging portion 9 to increase. Since the bending to the side is suppressed, the grommet 1 is prevented from moving in the opposite insertion direction.

Further, with respect to the pulling force acting on the grommet 1 after mounting in the insertion direction (counter arrow D direction), the flange portion 17 prevents the grommet 1 from moving toward the elastic bulging portion 9.

Therefore, a sufficient fixing force can be obtained against the axial force acting on the grommet 1, and the panel 11
Since it is difficult to disengage from the through hole 13, it is possible to obtain a more reliable mounting state.

FIG. 5 shows another embodiment of the present invention. The same components as those in the above embodiment are designated by the same reference numerals,
A duplicate description will be omitted.

In the grommet 25 in this embodiment, the elastic bulging portion 9 is formed by bulging from the peripheral surface 9b of the lower end portion of the wire insertion portion 27.

According to this embodiment, the same effect as that of the above embodiment can be obtained, and the material can be further saved.

[0035]

As described above, according to the grommet of the present invention, the grommet can be easily fitted into the through hole of the panel, and the workability of mounting is improved. Further, after mounting, it is difficult for the panel to come off from the panel, and a more reliable mounting state can be obtained.

[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 a state in which the grommet of FIG. 1 is being attached.

FIG. 3 is a cross-sectional view showing a state after mounting the grommet of FIG.

FIG. 4 is a cross-sectional view showing the action of the grommet of FIG.

FIG. 5 is a sectional view showing a modified example of the present invention.

FIG. 6 is a cross-sectional view showing a grommet according to a conventional example.

FIG. 7 is a cross-sectional view showing a grommet according to another conventional example.

[Explanation of symbols]

 1 Grommet Main Body 3 Wire Harness (Electric Wire) 5 Insertion Hole 7 Electric Wire Insertion Section 9 Elastic Swelling Section 11 Panel 13 Through Hole 15 Groove 17 Flange 21 Thick Section 23 Recess

Claims (1)

[Claims] 1. A grommet body having an insertion hole through which an electric wire is inserted, a hollow elastic bulge formed by bulging on an outer periphery of the grommet body, and a protrusion on one end side of the elastic bulge portion. A flange portion provided and a groove portion formed between the flange portion and the elastic bulging portion and fitted into the through hole of the panel, and inserted into the through hole from the elastic bulging portion side. In the grommet attached to the panel, a thick portion is provided inside the elastic bulging portion, and the thick portion has
A grommet provided with a recess that allows the elastic bulging portion to bend inward due to the insertion force and suppresses the elastic bulging portion to bend inward due to a counter-insertion force.