JPH0927226A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which secures appropriate waterproofness for a panel hole that varies in burring height and which can secure a good insertion property for the panel hole. SOLUTION: This grommet 1 comprises a harness support cylinder 6 provided on the outer surface of a disk-shaped base 4 and coaxial with the grommet 1 to support the wire harness 5 in a watertight manner; a grommet main body 2 made of a soft elastic material, located on the inner peripheral surface of the base 2 and coaxial with the grommet 1, and having an annular groove 8 and an appropriate number of waterproof sealing parts 10; and a lock member 3 made of a hard elastic material, having a ring-plate-shaped flange 24 that fits into the annular groove 8, and having a plurality of locking claws 26 provided at the upper end of a circumferential wall 25 erected on the bore part of the flange 24, the locking claws 26 being locked with the burring end 17 of a panel hole 16. The waterproof sealing part 10 comprises a ringlike-cross- section connecting wall 11 hanging down onto the front end face of the base 4 and a circular-cross-section ring part 12 provided integral with the connecting wall 11. A plurality of reinforcing ribs 13 are provided between the inside surface of the waterproof sealing part 10 and the front end face of the base 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for sealing a panel hole provided in a panel or the like, and more particularly to a grommet provided with a waterproof seal portion for contacting a panel surface near the panel hole and ensuring sealing performance. .

[0002]

2. Description of the Related Art Conventionally, various grommets to be mounted in panel holes of vehicle body panels of automobiles are known to have a two-part structure as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-63914. ing. As shown in FIG. 8, the conventional grommet 51 is composed of a grommet main body 52 and a lock member 53. More specifically, a grommet body 52 made of a soft elastic material such as rubber is provided with a disk-shaped substrate 54, and a harness support cylinder 6 for watertightly supporting the wire harness 5 on the rear surface of the substrate 54 via the bellows portion 7. Are installed coaxially.

An annular groove 58 is formed on the inner peripheral surface of the substrate 54.
And a lip-shaped outer ring side waterproof seal portion 55 and an inner ring side waterproof seal portion 56 are coaxially provided on the front end surface of the grommet body 52. Further, on the rear surface of the substrate 54, a plurality of concave pressing portions 9 for mounting the grommet 51 in the panel hole 16 of the panel 15 are provided.

Next, the lock member 53 made of a hard elastic material such as hard resin is provided with a ring-plate-shaped flange 24 fitted in the annular groove 58, and an upright position from the inner diameter portion of the flange 24 toward the front side. The provided cylindrical peripheral wall 25 is integrally provided. Further, the panel hole 1 is provided at the inner end of the peripheral wall 25.
6, a plurality of locking claws 2 locked to the burring tip 17
6 is provided facing outward. At the rear end of the locking claw 26, a stopper 27 is provided upright rearward so as not to move outward from the burring tip 17 of the panel hole 16. The number of the locking claws 26 and the grommet main body 52
The numbers of the pressing portions 9 on the side are provided so as to match.

In assembling the grommet 51 having the above structure, the flange 24 of the lock member 53 is fitted into the annular groove 58 of the grommet body 52 from the front. At this time, the grommet 51 is assembled by fitting the pressing portion 9 so as to match the locking claw 26 when viewed from the rear. Next, when the pressing portion 9 is pushed from behind the panel hole 16 of the panel 15 and the grommet 51 is pushed in, the locking claw 26 once bends to the axial center side and then outwardly as shown in FIG. It expands and is locked to the burring tip 17. At this time, since the stopper 27 is caught on the axial center side of the panel hole 16, the rear end of the locking claw 26 is located at the burring tip 1.
It does not deviate from 7.

[0006]

However, in the above-mentioned conventional grommet 51, the burring height H of the panel hole 16 varies as shown in FIG. 9, and the effective deflection range of the waterproof seal portions 55 and 56 is large. Lap amount A as
Is limited. Therefore, as shown in FIG. 10, when the burring height H becomes high, the panel 15 is hit too strongly to reduce the waterproof capability, and the waterproof seal parts 55, 5 are also provided.
Since 6 is pressed against the front end surface of the substrate 4, there is a problem that the insertion force W of the grommet 51 into the panel hole 16 becomes excessive. Further, as shown in FIG. 11, when the burring height H of the panel hole 16 is low, not only the waterproof function of the waterproof seal parts 55, 56 is deteriorated but also the waterproof seal parts 55, 5 are inserted at the time of insertion.
There is a problem that the sealing property cannot be secured due to the curling of No. 6 and the like.

The object of the present invention has been made in view of the above-mentioned problems, and a suitable waterproof property is secured for a panel hole having variations in burring height, and a good insertion into the panel hole. It is to provide a grommet that can secure the property.

[0008]

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 provide an annular ring on the inner peripheral surface of the substrate coaxially. A grommet body made of a soft elastic material having a groove and an appropriate number of waterproof seals, and a ring plate-shaped flange that fits in the annular groove, and the front end of the peripheral wall that is erected on the inner diameter of the flange. In a grommet including a lock member made of a hard elastic material having a plurality of locking claws that are locked to the burring tip of the panel hole, the at least one waterproof seal part hangs down from the front end face of the substrate. This can be achieved by a grommet characterized in that it is composed of a connection wall having a ring-shaped cross section provided and a ring portion having a circular cross section that is integrally provided at the front end of the connection wall.

Further, the above object can be achieved by the center position of the cross section of the ring portion of the waterproof seal portion being set outside the connection wall.

The above object can be achieved by providing a plurality of reinforcing ribs between the waterproof seal portion and the front end surface of the substrate.

Further, the above object can be achieved by providing a waterproof seal portion having a ring portion having a circular cross section and a lip-shaped waterproof seal portion on the front end face of the substrate coaxially.

[0012]

[Operation] In the grommet having the above-mentioned configuration according to the present invention, at least one waterproof seal portion is provided integrally with the connecting wall having a ring-shaped cross section which is vertically provided on the front end surface of the substrate, and the front end of the connecting wall. And a ring portion having a circular cross section. Therefore, when the grommet is pressed against the panel hole, the ring portion having a circular cross section of the waterproof seal portion makes line contact with the panel surface, so that the sealability can be secured. Further, the contact state does not change even if the waterproof seal portion is wound inside during the insertion work into the panel hole. Therefore, even if there is variation in the burring height of the panel holes, the contact state with the panel surface is always a line contact, so that uniform waterproofness can be ensured. Further, since the circular cross-section ring portion rotates during the insertion work into the panel hole, the insertion can be performed with a low insertion force, and the work efficiency can be improved.

Further, since the center position of the cross section of the ring portion of the waterproof seal portion is set outside the connecting wall, the ring portion having a circular cross section always rotates outward when the grommet is inserted into the panel hole. It will be. Therefore, the grommet can be reliably inserted with a low insertion force, so that the reliability of the grommet can be further improved together with the improvement of the working efficiency.

Further, since a plurality of reinforcing ribs are provided between the waterproof seal portion and the front end surface of the substrate, when the grommet is inserted into the panel hole, the buckling position of the front end of the connecting wall is stabilized and at the same time. The ring portion having a circular cross section rotates to enhance the contact force with the panel. Therefore, since the waterproofness of the grommet is improved, the reliability of the grommet can be further improved.

Further, since the waterproof seal portion having the ring portion having a circular cross section and the lip-shaped waterproof seal portion are provided on the front end face of the substrate coaxially, the wrap amount is large and the waterproof seal portion is wound inside. In addition to ensuring waterproofness, a lip-like waterproof seal portion that can secure waterproofness with a small contact force but a small amount of wrap complements each other, so that a more reliable grommet can be obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the grommet of the present invention will be described in detail below with reference to FIGS. FIG.
Is a cross-sectional view showing an embodiment of the grommet of the present invention, FIG. 2 is a partially enlarged cross-sectional view around the waterproof seal portion in FIG. 1,
3 and 4 are explanatory views of the operation in FIG. 2, and FIG. 5 is FIG.
A partially enlarged cross-sectional view showing a modification of the waterproof seal portion in FIG.
6 and 7 are partial cross-sectional views showing the deformation of the waterproof seal portion in FIG.

As shown in FIG. 1, the grommet 1 is composed of a grommet body 2 and a lock member 3. More specifically, the grommet body 2 made of a soft elastic material such as rubber has a disk-shaped substrate 4, and a harness support cylinder 6 that watertightly supports the wire harness 5 on the rear surface of the substrate 4 via the bellows portion 7. It is provided on the same axis. Further, an annular groove 8 is coaxially provided on the inner peripheral surface of the substrate 4, and one waterproof seal portion 10 is provided on the front end surface of the grommet body 2.

The waterproof seal portion 10 is an O-ring-shaped waterproof seal portion in which a ring-shaped ring portion 12 is provided at the front end of a connecting wall 11 having a ring-shaped cross section which is vertically provided on the front end surface of the substrate 4. Is. Further, an appropriate number of reinforcing ribs 13 are provided between the inner side surface of the waterproof seal portion and the front end surface of the substrate 4. Further, the outer surface of the substrate 4 is provided with a plurality of concave pressing portions 9 for mounting the grommet 1 in the panel holes 16 of the panel 15.

The lock member 3 made of a hard elastic material such as hard resin has a ring-plate-shaped flange 24 fitted in the annular groove 8 and a cylindrical peripheral wall 25 extending forward from the inner diameter of the flange 24. It is erected. Also, this peripheral wall 25
The front end of the panel hole 16 is provided with a plurality of locking claws 26 that are locked to the burring tip 17 of the panel hole 16, and the rear end of the panel hole 16 deviates outward from the burring tip 17 of the panel hole 16. A stopper 27 is erected so as not to do so. The number of the locking claws 26 is provided so as to match the number of the pressing portions 9.

In the grommet of the present embodiment having the above-described structure, first, the flange 24 of the lock member 3 is fitted into the annular groove 8 of the grommet main body 2 from the front to be integrally assembled. Then, as shown in FIG. 2, the grommet 1 is pressed by pressing the pressing portion 9 into the panel hole 16,
The locking claw 26 rides over the burring tip 17 and is locked in the panel hole 16. At this time, the ring portion 12 having a circular cross section is in line contact with the surface of the panel 15 in the vicinity of the panel hole 16 to ensure the waterproof property.

Further, even if the burring height H varies, the waterproof seal portion 10 has the lip portion 12 having a circular cross section, so that the panel 15 can be surely brought into line contact with the panel 15 and the connecting wall 11 is buckled and reinforced. The deformation of the ribs 13 appropriately presses the surface of the panel 15, so that the waterproof property does not deteriorate.

Further, when the burring height H is high as shown in FIG. 3, the amount of pushing of the grommet 1 when the grommet 1 is inserted into the panel hole 15 becomes large. However, since the connecting wall 11 is thin, the insertion force W can be small even if the reinforcing ribs 13 are provided discontinuously. At this time, the root portion of the lip portion 12 having a circular cross section and the connection wall 11 is buckled, and the reinforcing rib 13 is expanded so that the lip portion 12 is displaced on the surface of the panel 15 in the outward direction. To do. Therefore, since the insertion can be performed with a lower insertion force, the work efficiency can be improved without hindering the work.

Further, as shown in FIG. 4, when the grommet 1 is inserted into the panel hole 16, the lip portion 1 having a circular cross section is formed.
Even if 2 is pushed inward and turned into a rolled state, the lip portion 12 is always in line contact with the surface of the panel 15.
Therefore, the waterproofness can be surely ensured, and a highly reliable grommet can be obtained.

Further, as shown in FIG. 5, the waterproof seal portion 1
The center position of the ring portion 12 having a circular cross section of 0 is the connecting wall 11
It is set to be offset by a distance B outward from the outer wall surface.
Therefore, when the grommet 1 is pressed against the panel 15, the ring portion 12 having a circular cross section is always displaced outwardly, so that the waterproof seal portion 10 is pressed against the surface of the panel 15 with a suitable pressing force together with the deformation of the reinforcing rib 13. To be done. Therefore, since the waterproof property is surely ensured, the grommet having higher reliability can be obtained.

In addition, as shown in FIG. 6, if an O-ring-shaped waterproof seal portion 10b is provided on the inner ring side in addition to the O-ring-shaped waterproof seal portion 10a on the outer ring side, it should be avoided. Even if one of the waterproof seal parts rolls up due to a foreign substance being caught in the other, the other waterproof seal part retains the waterproof function, so that a more reliable grommet can be obtained. The waterproof seal portion has an advantage that the degree of freedom in design is large because the contact pressure with the surface of the panel 15 can be adjusted by the thickness of the connection wall 11 and the number of the reinforcing ribs 13, for example.

Further, as shown in FIG. 7, as a waterproof seal portion, a lip-shaped waterproof seal portion 14 is provided on the outer ring side and an O-ring shaped waterproof seal portion 10 is provided on the inner ring side. In this case, the O-ring-shaped waterproof seal portion 10 has a large wrap amount and can ensure a waterproof function even when it is wound inward, and a lip-shaped waterproof seal portion 10 having a small lap amount and a waterproof function with a low contact force. By complementing the advantages of the waterproof seal portion 14 with each other, a more reliable grommet can be obtained.

The present invention is not limited to the above-described embodiment, but can be implemented in other modes by making appropriate changes. For example, in the present embodiment, the auxiliary rib 13 is provided only on the inside of the O-ring-shaped waterproof seal portion 10, but it may also be provided on the outside. In this case, even if the ring portion 12 having a circular cross section is rolled inward, an appropriate contact pressure can be applied to the surface of the panel 15 to improve the waterproof function.

[0028]

As described above, according to the grommet of the present invention, at least one waterproof seal portion is integrally formed at the front end of the connection wall and the connection wall having a ring-shaped cross section which is vertically provided on the front end surface of the substrate. And a ring portion having a circular cross section. Therefore, during insertion work into the panel hole, the ring part with a circular cross section is rotated and displaced outwardly, so even if there is variation in the burring height of the panel hole, there is always line contact with the panel surface. Thus, the waterproofness of the waterproof seal portion can be reliably ensured, and the insertion work can be performed with a low insertion force to improve the work efficiency.

Further, since the center position of the cross section of the ring portion of the waterproof seal portion is set to the outside of the connecting wall, the ring portion having the circular cross section always rotates outward when the grommet is inserted into the panel hole. Displace as you do. Therefore, it is possible to obtain a grommet with high workability and reliability in combination with reliable insertion with low insertion force.

Further, since a plurality of reinforcing ribs are provided between the waterproof seal portion and the front end surface of the substrate, when the grommet is inserted into the panel hole, the connection wall and the ring portion having a circular cross section are connected. The buckling position can be set on the part.
Therefore, it is possible to stabilize the displacement movement of the ring portion having a circular cross-section, and when the ring portion having a circular cross-section is displaced, the contact force with the panel surface is strengthened, so that the waterproof property can be improved. . Therefore, a more reliable grommet can be obtained.

Furthermore, a waterproof seal portion having a ring portion having a circular cross section and a lip-shaped waterproof seal portion are provided coaxially on the front end surface of the substrate. Therefore, the advantages of the O-ring-shaped waterproof seal portion that can secure the waterproof function even when the wrap amount is large and the lip-shaped waterproof seal portion that can secure the waterproof function with a low contact force even if the wrap amount is small are provided. Since the advantages complement each other, a more reliable grommet can be obtained.

[Brief description of drawings]

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

FIG. 2 is a partially enlarged cross-sectional view around the waterproof seal portion in FIG.

FIG. 3 is an operation explanatory diagram when the burring height in FIG. 1 is high.

FIG. 4 is an operation explanatory view showing a case where the ring portion in FIG. 1 is rolled inward.

FIG. 5 is a partially enlarged cross-sectional view showing a modified example of the waterproof seal portion.

FIG. 6 is a partial cross-sectional view showing another modified example of the waterproof seal portion.

FIG. 7 is a partial sectional view showing still another modified example of the waterproof seal portion.

FIG. 8 is an assembly diagram showing an example of a conventional grommet.

FIG. 9 is a partially enlarged cross-sectional view around the waterproof seal portion in FIG.

FIG. 10 is an operation explanatory view of FIG. 9.

FIG. 11 is a diagram for explaining another operation in FIG. 9.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 Grommet main body 3 Lock member 4 Board 5 Wire harness 6 Harness support cylinder 8 Annular groove 10 O-ring shaped waterproof seal part 11 Connection wall 12 Ring-shaped ring part 13 Reinforcing rib 14 Lip shaped waterproof seal part 16 Panel hole 17 Burring tip 24 Flange 25 Circumferential wall 26 Locking claw 27 Stopper A Lapping amount H Burring height W Inserting force

Claims (4)

[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
The inner peripheral surface of the substrate has a grommet main body made of a soft elastic material coaxially with an annular groove and an appropriate number of waterproof seal portions, and a ring plate-shaped flange that fits into the annular groove, A grommet composed of a lock member made of a hard elastic material, in which a plurality of locking claws that are locked to the burring tips of the panel holes are provided at the front end of the peripheral wall erected on the inner diameter of the flange, One of the waterproof seal portions is composed of a connecting wall having a ring-shaped cross section that is vertically provided on the front end surface of the substrate, and a ring portion having a circular cross section that is integrally provided at the front end of the connecting wall. Is a grommet. 2. The grommet according to claim 1, wherein the cross-sectional center position of the ring portion of the waterproof seal portion is set outside the connection wall. 3. The grommet according to claim 1, wherein a plurality of reinforcing ribs are provided between the waterproof seal portion and the front end surface of the substrate. 4. The waterproof seal portion having the ring portion having the circular cross section and the lip-shaped waterproof seal portion are provided coaxially on the front end surface of the substrate.
Grommet described.