JP3813779B2 - Grommet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grommet, and more particularly to a grommet that can reliably and easily penetrate and hold a long member such as a wire harness with respect to a mounting plate such as a vehicle body panel.
[0002]
[Prior art]
For example, in Japanese Patent Laid-Open No. 8-212857, a small-diameter cylindrical portion (first cylindrical portion) that grips a wire harness and a hole formed in the vehicle body panel in order to arrange the wire harness so as to penetrate the vehicle body panel of an automobile. A large-diameter cylindrical portion (second cylindrical portion) that can be fitted into the mounting hole, a tapered cylindrical portion (connecting portion) that connects the small-diameter cylindrical portion and the large-diameter cylindrical portion, and an outer peripheral surface of the large-diameter cylindrical portion The grommet provided with the groove part and presser piece (hook part) which were provided in this way is shown. In the same publication, a pressing piece that uses a tongue piece that extends radially from the outer peripheral surface of the large-diameter cylindrical portion is shown.
According to this grommet, the periphery of the presser piece is tapered by turning over (inverted) so that the inner peripheral surface of the large-diameter cylindrical portion faces outward, and the tip of the presser piece is inserted into the mounting hole. Then, by pulling the small-diameter cylindrical portion into the mounting hole and returning the large-diameter cylindrical portion to the initial shape, the groove portion of the large-diameter cylindrical portion can be engaged with the edge of the mounting hole of the panel, and the wire harness is connected to the vehicle body panel. Can be securely passed through.
[0003]
[Problems to be solved by the invention]
By the way, the said Unexamined-Japanese-Patent No. 8-212857 shows what uses the annular member which has a flat surface as a taper cylinder part which connects a small diameter cylinder part and a large diameter cylinder part. When the tip of the presser piece is inserted into the mounting hole and the small-diameter cylindrical portion is pulled into the mounting hole, that is, when the large-diameter cylindrical portion is returned from the inverted state to the initial shape, the tapered cylindrical portion is pushed in the circumferential direction. It is deformed to be shrunk or so that one part is compressed in the circumferential direction and the other part is stretched in the circumferential direction.
In order to start such a deformation | transformation of a taper cylinder part by drawing in a small diameter cylinder part in an attachment hole, strong drawing-in force or insertion force was required. Therefore, in order to reduce the burden on the operator, there has been a demand for an improvement that can return the large-diameter cylindrical portion to the initial shape even with a small insertion force.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a grommet that can be easily and surely attached to a mounting plate such as a panel with a small insertion force.
[0005]
[Means for Solving the Problems]
The object of the present invention is achieved by the following configurations (1) and (2).
Configuration (1): In order to penetrate and hold the long member in the mounting hole formed in the mounting plate, the first cylindrical portion through which the long member can be inserted and the outer peripheral surface of the first cylindrical portion are provided. A second cylindrical portion connected via an annular connecting portion; a groove portion provided along an outer peripheral surface of the second cylindrical portion; and the groove portion and the connecting portion on the outer peripheral surface of the second cylindrical portion. A tip portion of the flange portion is inserted into the mounting hole by turning the second cylindrical portion upside down so that the inner peripheral surface faces outward, and then the second cylindrical portion. Is a grommet that allows the first cylindrical portion to be inserted into the mounting hole by restoring the initial shape, and that the groove portion is fitted to the opening edge of the mounting hole, and is formed on the inner peripheral surface of the connecting portion. When the second cylindrical portion is restored to the initial shape, the connecting portion is deformed radially outward. A grommet characterized by being provided with a recess for urging it.
Configuration (2): A configuration in which a plurality of flanges are provided so as to extend radially from the second cylindrical portion, and the recesses are provided at locations corresponding to the gaps between the flanges (1) ) Grommet described in the above.
[0006]
Here, the form of the concave portion is not limited, and may be a concave groove or the like extending in the axial direction (of the wire harness) of the connecting portion. The portion of the connecting portion where the concave portion is provided may be thin, that is, the concave portion may have a notch shape in a sectional view. Moreover, the location where the recessed part of the connection part was provided may become a substantially uniform thickness with the other location of a connection part, ie, a recessed part may be concave shape in cross-sectional view. The recess may be slit-shaped.
[0007]
The first cylindrical portion only needs to have an inner diameter corresponding to the outer diameter of a long member such as a wire harness, and may have a slightly smaller inner diameter so that the long member is press-fitted. . Note that the first cylindrical portion does not need to have the same inner diameter dimension or outer diameter dimension along the axial direction, and may be, for example, a stepped cylindrical shape or a tapered shape.
And the connection part should just protrude in the radial direction from the arbitrary positions in the outer peripheral surface of a 1st cylindrical part, and should be continuing in the circumferential direction, for example, may be substantially cone shape or substantially truncated cone shape.
[0008]
On the other hand, the 2nd cylindrical part should just have the outer diameter size corresponding to the hole diameter size of an attachment hole, and the base end part should just be connected to the connection part.
Therefore, the first cylindrical portion and the second cylindrical portion may be arranged in a nested manner, for example. The first cylindrical portion, the connecting portion, and the second connecting portion may be integrally formed of a synthetic resin having an appropriate elastic force and water resistance. It may be.
[0009]
According to the grommet of the configuration (1), when returning the second cylindrical portion from the inverted state to the initial shape, and when turning the second cylindrical portion from the initial shape, the connection is made from the location where the concave portion of the connecting portion is provided. The deformation is easily started so as to be compressed in the circumferential direction of the portion. Therefore, this grommet can be mounted on a mounting plate such as a panel with a small insertion force, and the second cylindrical portion can be easily reversed prior to mounting, thereby reducing the burden on the operator when mounting the grommet.
[0010]
Moreover, according to the grommet of the configuration (2), since the recess is provided at a position corresponding to the space between the flanges provided in the second cylindrical portion on the inner peripheral surface of the connection portion, the recess is provided. It is possible to efficiently reduce the tensile strength of the connecting portion at the spot, and the deformation that allows the connecting portion to be compressed in the circumferential direction is more easily started from the spot where the concave portion is provided. Therefore, the burden on the operator when wearing the grommet is further reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, FIG. 3 is a sectional view taken along line YY1 in FIG. 2, and FIGS. It is YY sectional drawing in FIG. 2 which shows a procedure.
As shown in FIG. 3, the grommet 10 is provided with a wire harness in a mounting hole 12 provided in the vehicle body panel 11 in order to arrange a wire harness (not shown) so as to penetrate the vehicle body panel 11 of the automobile. It can be fitted in a state where it is inserted and held. The mounting hole 12 has a circular shape, and a flange 13 having a predetermined height is formed along the opening edge.
[0012]
As shown in FIGS. 1 to 3, the grommet 10 includes a first cylindrical portion 21 through which a wire harness can be inserted, an annular connecting portion 23 provided on the outer peripheral surface of the first cylindrical portion 21, and a connecting portion 23. A second cylindrical portion 22 coaxially connected to the first cylindrical portion, a groove portion 24 provided along the outer peripheral surface of the second cylindrical portion 22, and a radially provided outer peripheral surface of the second cylindrical portion 22. A plurality of flange portions 25 and a plurality of guide portions 26 provided on the outer peripheral surface of the first cylindrical portion 21 are provided. In the grommet 10, a first cylindrical portion 21, a connecting portion 23, a second cylindrical portion 22, a flange portion 25, and a guide portion 26 are integrally formed of a synthetic resin having an appropriate elastic force and water resistance.
[0013]
As shown in FIG. 3, the first cylindrical portion 21 has a stepped shape in which a small diameter portion 27 and a large diameter portion 28 are continuously provided along the same axis.
The small diameter portion 27 has an inner diameter dimension corresponding to the outer diameter dimension of the wire harness, and a plurality of annular ribs 27A are provided along the inner peripheral surface. When the wire harness is press-fitted, the small-diameter portion 27 is in close contact with the outer peripheral surface of the wire harness while the ribs 27A are elastically deformed, thereby holding the wire harness while maintaining airtightness.
[0014]
On the other hand, the large-diameter portion 28 has an inner diameter larger than the inner diameter of the small-diameter portion 27, and a plurality of annular ribs 28A are provided along the inner peripheral surface.
After the wire harness is press-fitted into the small-diameter portion 27, the large-diameter portion 28 is configured to hold the wire harness while maintaining airtightness by filling and solidifying a predetermined filler.
[0015]
The connecting portion 23 has a substantially conical shape that expands from the boundary portion between the small diameter portion 27 and the large diameter portion 28 described above toward the open end side of the small diameter portion 27.
The second cylindrical portion 22 has an outer diameter corresponding to the opening size of the mounting hole 12 and has an inner diameter larger than the outer diameter of the small diameter portion 27 and is connected to the connection portion 23. . Accordingly, the second cylindrical portion 22 is disposed substantially in a nested manner with respect to the small diameter portion 27 so as to accommodate the small diameter portion 27 at a predetermined interval in the radial direction. And the recessed part 30 is provided in the inner peripheral surface of the connection part 23 at predetermined intervals in the circumferential direction. The recess 30 will be described later.
[0016]
The groove portion 24 has a substantially U-shaped cross section into which the flange 13 of the mounting hole 12 can be fitted, and is continuously formed on the second cylindrical portion 22 along the circumferential direction orthogonal to the axis of the second cylindrical portion 22. Has been.
The flange portion 25 is adjacent to the groove portion 24, has a predetermined thickness along the axis of the second cylindrical portion 22, and is formed in a plate shape having a predetermined width along a circumferential direction orthogonal to the axis. The second cylindrical portion 22 protrudes at a predetermined interval in the circumferential direction. As shown in FIG. 2, here, the four flange portions 25 are provided at intervals of 90 degrees around the axis of the first cylindrical portion 21.
[0017]
The guide portion 26 is formed in a plate shape having a predetermined width along the axis of the first cylindrical portion 21 and having a predetermined thickness along a circumferential direction orthogonal to the axis, and has a predetermined width in the circumferential direction. It protrudes on the first cylindrical portion 21 with an interval. Here, four guide portions 26 are provided at intervals of 90 degrees around the axis of the first cylindrical portion 21. In addition, these guide parts 26 were provided in the 2nd cylindrical part 22 in the outer peripheral surface of the 1st cylindrical part 21 so that each collar part 25 mentioned above may not interfere when the 2nd cylindrical part 22 is turned over. It is provided in the location corresponding between the collar parts 25.
[0018]
As shown in FIG. 1, a concave portion 30 is provided on the inner peripheral surface of the connection portion 23. Here, the concave portion 30 is formed in a substantially groove shape extending along the axial direction of the first cylindrical portion 21. Here, the recess 30 is formed so that the depth of the groove decreases toward the boundary between the large diameter portion 28 and the small diameter portion 27 of the first cylindrical portion 21. However, the shape of the recess is not limited to this, and for example, the groove width or the groove width and the groove depth may be reduced toward the boundary between the large diameter portion 28 and the small diameter portion 27.
[0019]
As shown in FIG. 2, here, four concave portions 30 are on the connection portion 23 in the same phase as the guide portion 26 around the axis of the first cylindrical portion 21, in other words, the extending direction of each guide portion 26. Are provided at intervals of 90 degrees on the extended line drawn on the line.
[0020]
As shown in FIG. 3, the thickness of the connection portion 23 at the location where the recess 30 is provided is thinner than the thickness at other locations, that is, the recess 30 is a predetermined location on the inner peripheral surface of the connection portion 30. It is formed by notching.
[0021]
Next, a procedure for arranging a wire harness using such a grommet 10 will be described. 4 to 6 show a YY cross section in FIG.
First, a wire harness (not shown) is inserted through the first cylindrical portion 21 of the grommet 10, and the large diameter portion 28 is filled with a predetermined filler and solidified.
[0022]
Then, as shown in FIG. 4, the second cylindrical portion 22 is turned over so that the inner peripheral surface faces outward with the vicinity of the connecting portion 23 as a fulcrum with respect to the first cylindrical portion 21, and the flange 13 of the mounting hole 12 is The grommet 10 is disposed so as to be covered by the second cylindrical portion 22. At this time, the grommet 10 is guided by the projecting tip of the guide portion 26 being inscribed in the mounting hole 12, whereby the first cylindrical portion 21 is reliably arranged on the same axis with respect to the mounting hole 12.
[0023]
Thereafter, the second cylindrical portion 22 is pulled by pulling a wire harness (not shown) from the vehicle body panel 11 toward the left in the drawing in a state where the open end portion of the second cylindrical portion 22 is in contact with the vehicle body panel 11. The large diameter portion 28 of the first cylindrical portion 21 is inserted into the mounting hole 12 while being deformed so as to restore the initial shape.
[0024]
Next, as shown in FIG. 5, when the wire harness is further pulled toward the left in the figure, the open end of the second cylindrical portion 22 is in contact with the vehicle body panel 11. The deformation is started so that the inner peripheral surface which is the outer peripheral surface is reversed. At this time, the connecting portion 23 is deformed so as to be compressed in the circumferential direction. However, since the tensile strength at the portion where the concave portion 30 shown in FIGS. The deformation of 23 is easily started from the place where the recess 30 is provided. That is, the portion of the connecting portion 23 where the recess 30 is provided is deformed outward in the radial direction in the initial shape of the connecting portion.
At this time, each flange 25 is inscribed in the mounting hole 12.
[0025]
Then, as shown in FIG. 6, when the wire harness is further pulled toward the left in the figure, each flange 25 slides on the opening edge of the mounting hole 12, and the second cylindrical portion 22 is opened. It deforms so as to expand toward the end.
[0026]
When the wire harness is further pulled toward the left in the drawing, the second cylindrical portion 22 is restored to the initial shape as shown in FIG. 3, and the flange 13 of the vehicle body panel 11 is fitted into the groove of the second cylindrical portion 22. Combined.
[0027]
According to the grommet 10 described above, when returning the second cylindrical portion 22 from the inverted state to the initial shape, and when turning the second cylindrical portion 22 from the initial shape, from the location where the concave portion 30 of the connecting portion 23 is provided, The deformation that can be compressed in the circumferential direction of the connecting portion 23 is easily started. In addition, since the recessed part 30 is provided in the location corresponding to between the collar parts 25 provided in the 2nd cylindrical part 22 in the internal peripheral surface of the connection part 23, the connection part 23 in the location in which the recessed part 30 was provided. The tensile strength of is efficiently reduced. Therefore, the grommet 10 can be mounted on the vehicle body panel 11 with a small insertion force, and the second cylindrical portion 22 can be easily reversed prior to mounting, so that the mountability is very good.
[0028]
In addition, this invention is not limited to embodiment mentioned above, The material and shapes, such as a 1st cylindrical part, a connection part, a 2nd cylindrical part, a groove part, a collar part, a guide part, which were illustrated in the above-mentioned embodiment. , Dimensions, forms, numbers, arrangement locations, and the like are arbitrary as long as the object of the present invention can be achieved, and are not limited.
[0029]
【The invention's effect】
As described above, the grommet of the present invention is provided with a recess on the inner peripheral surface of the connecting portion that facilitates deformation of the connecting portion in the circumferential direction when the second cylindrical portion is restored to the initial shape. .
Therefore, when returning the second cylindrical portion from the inverted state to the initial shape and when turning the second cylindrical portion from the initial shape, the second cylindrical portion is compressed in the circumferential direction of the connecting portion from the location where the concave portion of the connecting portion is provided. Since such deformation is easily started, it can be mounted on a mounting plate such as a panel even with a small insertion force, and the second cylindrical part can be easily reversed prior to mounting, so that the mounting property is good.
Moreover, if the recessed part is provided in the location corresponding to between the collar parts provided in the 2nd cylindrical part in the internal peripheral surface of a connection part, the tensile strength of the connection part in the location in which the recessed part was provided is efficient. It can be reduced well and the wearability is further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line XX in FIG.
3 is a cross-sectional view taken along line YY1 in FIG.
FIG. 4 is a diagram illustrating a grommet attachment procedure.
FIG. 5 is a diagram illustrating a grommet attachment procedure.
FIG. 6 is a diagram illustrating a grommet attachment procedure.
[Explanation of symbols]
10 Grommet 11 Body panel (mounting plate)
12 mounting hole 21 first cylindrical portion 22 second cylindrical portion 23 connecting portion 24 groove portion 25 flange portion 30 concave portion

Claims (2)

In order to penetrate and hold the long member in the mounting hole formed in the mounting plate, a first cylindrical portion through which the long member can be inserted, and an annular connecting portion provided on the outer peripheral surface of the first cylindrical portion A second cylindrical portion connected via the groove, a groove provided along the outer peripheral surface of the second cylindrical portion, and provided between the groove and the connecting portion on the outer peripheral surface of the second cylindrical portion. And has a buttock
By turning the second cylindrical part so that the inner peripheral surface faces outward, the tip of the flange is inserted into the mounting hole, and then the second cylindrical part is restored to the initial shape, thereby restoring the first cylinder. A grommet for inserting a part into the mounting hole and fitting the groove into an opening edge of the mounting hole,
The grommet is characterized in that a concave portion is provided on an inner peripheral surface of the connection portion for urging the connection portion to be deformed radially outward when the second cylindrical portion is restored to an initial shape. 2. The grommet according to claim 1, wherein a plurality of the flange portions are provided so as to extend radially from the second cylindrical portion, and the concave portion is provided at a position corresponding to the space between the flange portions.

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