JPH08316658A - Grommet - Google Patents

Abstract

PURPOSE: To improve the reliability of a grommet and the mountability on a panel hole by permitting the locking claw of the grommet to be easily locked to the leading edge of the bar ring of the nonuniform panel hole, while ensuring the strength of the circumferential wall of the grommet. CONSTITUTION: On the lock member 3 of a grommet, a cylindrical circumferential wail 25 is provided inward from the inside diameter of a ring-shaped flange 24 to be locked inside the annular groove of the grommet main body. At the inner edge of the circumferential wall 25, a plurality of interlock claws to be locked to the leading edge of the bar ring of the panel hole are directed outward. At the leading edge of the locking claw 26, a double-step stopper 27 is arranged so as to prevent the locking claw 26 from deviating from the leading edge of the bar ring of the panel hole. The total width H1 of the double- step stopper 27 is wide, however, the width H2 at the center is narrow, and a long center stopper 28 and double stoppers 29 at both edges are provided. On the external side of the double stopper 29, an inclined guide plane 30 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention ensures that a grommet engaging claw for sealing a panel hole provided in a panel or the like is securely engaged with a burring tip portion of the panel hole, and a waterproof property is surely ensured. Regarding grommets that can.

[0002]

2. Description of the Related Art Conventionally, various grommets have been used in order to ensure protection and waterproof of a wire harness that is routed through a panel hole provided in a vehicle body of an automobile or the like. For example, as shown in FIG. 4, a conventional grommet 51
Is composed of the grommet body 2 and the lock member 53. That is, the grommet main body 2 made of a soft elastic material such as rubber has a disk-shaped substrate 4 and a harness support tube 6 for watertightly supporting the wire harness 5 on the outer surface of the substrate 4 coaxially via the bellows portion 7. It is provided.

Further, as shown in FIG. 5, an annular groove 8 is provided on the inner peripheral surface of the base plate 4, and a waterproof lip 9 on the outer ring side and an inner ring side on the front end surface of the grommet main body 2. The waterproof lip 10 is provided concentrically. Further, on the outer surface of the substrate 4, a plurality of concave pressing portions 11 for mounting the grommets 51 in the panel holes 16 of the panel 15 are provided. The number of pressing portions 11 is provided so as to match the number of locking claws 56 described later.

Next, the lock member 53 made of a hard elastic material such as hard resin is provided with a ring-shaped flange 54 that engages in the annular groove 8, and a cylindrical shape from the inner diameter of the flange 54 toward the inside. A peripheral wall 55 is erected. Further, a plurality (three in FIG. 4) of locking claws 56 that are locked to the burring tips 17 of the panel holes 16 are provided on the inner end of the peripheral wall 55.
Are provided facing outward. Also, this locking claw 5
On the outer surface of 6, the burring tip 1 of the panel hole 16
A stopper 57 is erected so as not to deviate from 7.

In the above structure, first, the lock member 53 is provided.
The flange 54 is fitted into the annular groove 8 of the grommet body 2 to assemble the grommet 51. At this time, the pressing portion 11 moves the locking claw 56 in the axial direction.
Is fitted to match. Next, when the grommet 51 is pushed in from the outside of the panel hole 16 by pushing the pressing portion 11 with a finger or the like, the locking claw 56 once bends to the axial center side, and then spreads outward to expand the burring tip. It is locked to the part 17. At this time, since the stopper 57 is caught on the inner peripheral surface of the panel hole 16, the locking claw 56 does not deviate from the burring tip portion 17.

[0006]

However, in the above-mentioned conventional grommet 51, as shown in FIG.
If the burring height B of 6 is low, the tip of the stopper 57 will be disengaged from the burring end, and the grommet 51 will be incompletely locked in the panel hole 16 and will deviate from the panel hole 16. There's a problem.

Further, when the burring height B of the panel hole 16 is low and the inner diameter of the burring tip 17 is small as shown in FIG. 7, the stopper 57 gets over the burring tip 17 and deviates to the outside. Therefore, not only the locking of the grommet 51 with the panel hole 16 becomes unstable, but also the waterproof lips 9 and 10 are lifted from the panel 15 and the contact pressure is lowered to deteriorate the waterproof property. is there.

To solve this problem, there has been proposed a grommet in which a stopper 57 is extended and an extension stopper 58 is added as shown in FIG. However, in this configuration, since the locking claw 56 interferes with the peripheral wall 55 when the locking claw 56 bends toward the axial center side, a large escape hole 59 must be provided in the peripheral wall 55. Therefore, when the strength of the peripheral wall 55 is reduced, or when the escape hole 59 reaches the flange 54, the lock member 53 cannot be sufficiently pressed even if the pressing portion 11 is pressed, so that there is a problem that work efficiency is reduced.

The object of the present invention has been made in view of the above-mentioned problems, and while securing the strength of the peripheral wall of the grommet, the locking claws of the grommet can be securely and easily engaged with the burring tips of the uneven panel holes. (EN) Provided is a grommet which can be stopped and can improve the reliability of the grommet and the mountability in a panel hole.

[0010]

SUMMARY OF THE INVENTION The above object of the present invention is to provide a harness support cylinder for watertightly supporting a wire harness on the outer surface of a disk-shaped substrate coaxially, and to form an annular groove on the inner peripheral surface of the substrate. A grommet body made of a soft elastic material having a waterproof lip, and a peripheral wall that is erected inwardly at the inner diameter portion of a ring-shaped flange that fits into the annular groove, and a plurality of engagement members are provided at the inner end portion of the peripheral wall. In a grommet composed of a locking member made of a hard elastic material provided with a stop claw facing outward, a convex two-step stopper is erected at the end of the locking claw and the tip of the stopper is provided. This can be achieved by a grommet characterized in that an escape hole is provided on the peripheral wall corresponding to the central stopper provided on the.

The above object can also be achieved by providing guide inclined surfaces on the outer surfaces of both shoulder stoppers provided on both sides of the central stopper.

[0012]

[Operation] In the grommet according to the present invention, a convex two-step stopper is provided upright at the end of the locking claw, and a clearance hole is formed on the peripheral wall corresponding to the central stopper provided at the tip of the stopper. Is provided. That is, a long center stopper is provided at the center tip of the locking claw, and a relatively small escape hole is provided on the peripheral wall corresponding to the center stopper.

Therefore, for example, the locking claws of the grommets are reliably locked to the burring tips of the panel holes corresponding to the panel holes in which the burring height of the panel holes and the inner diameter of the burring tips are not uniform. The waterproof lip is appropriately pressed against the panel surface to ensure waterproofness. Moreover, since it does not interfere with the peripheral wall, workability can be improved. Further, since the width of the central stopper at the tip of the locking claw is smaller than the total width of the two-step stopper, the escape hole can be made relatively small. Therefore, since the strength and rigidity of the peripheral wall of the lock member are secured, the grommet can be pressed against the panel hole with a sufficient force, and the workability can be further improved.

Further, since the guide inclined surfaces are provided on the outer surfaces of both shoulder stoppers provided on both sides of the central stopper, when the grommet is pressed into the panel hole, the elasticity of the waterproof lip at the burring tip end portion. Due to the force, the central stopper slides smoothly on both shoulder stoppers and the locking claws are locked at the proper positions in the panel holes. Therefore, the waterproof property is reliably ensured by the waterproof lip, and the mounting work can be further improved.

[0015]

EXAMPLES Examples of the grommet of the present invention will be described in detail below with reference to FIGS. 1 to 3. 1 is a sectional view showing an embodiment of the grommet of the present invention, FIG. 2 is a partial sectional view of the locking claw in FIG. 1, and FIG. 3 is a perspective view in FIG.
As shown in FIG. 1, the grommet 1 is composed of a grommet body 2 and a lock member 3. For more information,
A grommet main body 2 made of a soft elastic material such as rubber has a disc-shaped substrate 4, and a harness support cylinder 6 for water-tightly supporting a wire harness 5 is coaxially provided at the center of the substrate 4 via a bellows portion 7. It is provided in. Further, an annular groove 8 is provided on the inner peripheral surface of the substrate 4, and the grommet body 2
An outer ring side waterproof lip 9 and an inner ring side waterproof lip 10 are concentrically provided on the inner end surface of the. Further, on the outer surface of the substrate 4, a plurality of concave pressing portions 11 for mounting the grommet 1 in the panel hole 16 of the panel 15 are provided.

Next, the lock member 3 made of a hard elastic material such as hard resin has a ring-shaped flange 24 that engages in the annular groove 8, and a cylindrical shape inward from the inner diameter of the flange 24. A peripheral wall 25 is erected. Also, this peripheral wall 2
A plurality (three in this embodiment) of locking claws 26 that are locked to the burring tips 17 of the panel holes 16 are provided at the inner end of the member 5 toward the outside. The number of pressing portions 11 is provided so as to match the number of locking claws 26.

A two-step stopper 27 is provided upright on the tip of the locking claw 26 so that the locking claw 26 does not deviate from the burring tip 17 of the panel hole 16. As shown in FIG. 3, the two-stage stopper 27 is provided with a central stopper 28 having a wide overall width H1 but a narrow central portion 28 having a width H2, and both shoulder stoppers 29 provided at both ends thereof.

Further, a guide inclined surface 30 is provided on the outer side surface of each of the shoulder stoppers 29, and the burring tip portion 17 that abuts on the central stopper 28 when the grommet is attached is two.
When sliding down the step stopper 27, the shoulder stoppers 29 are prevented from catching on the shoulder stoppers 29 to cause an abnormal locking state.

When the grommet 1 is pressed into the panel hole 16, the locking claw 26 bends in the axial direction. At this time, since the clearance hole 31 corresponding to the central stopper 28 is provided in the peripheral wall 25, the central stopper 28 does not interfere with the peripheral wall 25. Further, since the inner diameter of the peripheral wall 25 is passed by the wire harness 5, connectors and the like, it is desirable to make it as close as possible to the inner diameter of the panel hole 16, but the position of the locking claw 26 is determined by the inner diameter of the panel hole 16. Therefore, in this embodiment, the peripheral wall 25 having the locking claws 26 is provided as the inner wall 32 which is partially close to the axial center side. Therefore, escape hole 3
1 is provided on the inner wall 32 which is a part of the peripheral wall 25.
Further, as shown in FIG. 2, portions of the flange 24 located outside the locking claws 26 and the two-step stoppers 27 are partially cut out for convenience of die cutting.

In the present embodiment having the above-mentioned structure, FIG.
As shown in FIG. 1, first, the grommet 1 assembled by fitting the flange 24 of the lock member 3 into the annular groove 8 of the grommet body 2 from the inside is pressed against the panel hole 16 by pressing the pressing portion 11. At this time, since the two-step stopper 27 is provided upright on the locking claw 26, even when the burring height of the panel hole 16 is low, the burring tip portion 17 is also provided.
Even if the inner diameter of the stud is small, the locking claw 26 is reliably locked to the burring tip 17. Therefore, the waterproof lips 9 and 10 on the outer ring side and the inner ring side are appropriately pressed against the panel 15, so that the waterproof function is ensured.

Further, since the inner wall 32, which is a part of the peripheral wall 25, is provided with the escape hole 31 corresponding to the central stopper 28, even if the locking claw 26 is provided with the two-step stopper 27, it interferes with the inner wall 32. It does not interfere with the installation work. Further, as shown in FIG. 3, the width H2 of the central stopper 28 at the tip of the locking claw 26 has a width of two steps.
Since it is smaller than the total width H1 of 7, the width H3 of the escape hole 31 can be set small. Therefore, the strength and rigidity of the lock member 3 are maintained, and the grommet 1 is pressed by the panel hole 16 with sufficient pressing force.
Since it can be pressed against, the work efficiency can be improved.

Further, since the guide inclined surface 30 is provided on the outer surface of both shoulder stoppers 29 in the two-step stopper 27, when the grommet 1 is pressed into the panel hole 16,
The burring tip portion 17 slides smoothly from the central stopper 28 to the shoulder stoppers 29 and is locked at the regular position of the locking claw 26. Therefore, the grommet 1 is surely and easily attached to the panel 15, and the waterproof lips 9 and 10 press the panel 15 with an ideal contact pressure, so that the waterproof property can be surely ensured.

[0023]

As described above, according to the grommet of the present invention, a convex two-step stopper is erected at the end of the locking claw and corresponds to the central stopper provided at the tip of the stopper. An escape hole is provided on the surrounding wall. That is, a long center stopper is provided at the center tip of the locking claw, and a relatively small escape hole is provided on the peripheral wall corresponding to the center stopper. Therefore, since the locking claws are reliably locked to the burring tips even when the burring height is low, the grommet can be securely and easily held on the panel.
It is possible to ensure waterproofness with the waterproof lip. Further, since the escape hole corresponding to the central stopper is provided in the peripheral wall and the strength and rigidity of the lock member are secured, the two-step stopper interferes with the peripheral wall even if the panel hole is pressed with sufficient pressing force. Therefore, the efficiency of the mounting work can be improved.

Further, since the guide inclined surfaces are provided on the outer surfaces of both shoulder stoppers provided on both sides of the central stopper, the panel can be held more reliably and easily, and the waterproof lips are provided by the waterproof lip. Can be reliably secured. Therefore, it is possible to improve the reliability of the grommet and further improve the efficiency of the mounting work.

[Brief description of drawings]

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

FIG. 2 is a partial sectional view of a locking claw in FIG.

FIG. 3 is a perspective view of FIG.

FIG. 4 is a front view showing an example of a conventional grommet.

5 is a partial cross-sectional view of the locking claw in FIG.

FIG. 6 is an explanatory diagram of the operation in FIG.

FIG. 7 is another operation explanatory view of FIG.

FIG. 8 is a partial perspective view in which a stopper is added to a conventional locking claw.

[Explanation of symbols]

 1 Grommet 2 Grommet main body 3 Lock member 4 Substrate 5 Wire harness 6 Harness support cylinder 8 Annular groove 9,10 Waterproof lip 16 Panel hole 17 Burring tip 24 Flange 25 Circumferential wall 26 Locking claw 27 Two-step stopper 28 Center stopper 29 Both Shoulder stopper 30 Guide slope 31 Escape hole 32 Inner wall

Claims (2)

[Claims] 1. A harness support cylinder for watertightly supporting a wire harness is provided coaxially on an outer surface of a disk-shaped substrate, and
A grommet body made of a soft elastic material having an annular groove and a waterproof lip on the inner peripheral surface of the substrate, and a peripheral wall erected inwardly on the inner diameter portion of a ring-shaped flange fitted in the annular groove. In the grommet 1 including a locking member made of a hard elastic material, provided on the inner end of the peripheral wall with a plurality of locking claws facing outward, the grommet 1 has a convex shape at the end of the locking claw. A grommet characterized in that a two-stage stopper is provided upright and an escape hole is provided on the peripheral wall corresponding to a central stopper provided at the tip of the stopper. 2. The grommet according to claim 1, wherein a guide inclined surface is provided on an outer surface of both shoulder stoppers provided on both sides of the central stopper.