JP7227036B2 - Grommet - Google Patents

Description

The present invention relates to grommets.

For example, a wire harness that is routed between a vehicle body and a door of a vehicle such as an automobile is passed through a flexible grommet so as to be protected and waterproofed.

The grommet includes a small-diameter tubular portion through which the wire harness is inserted, an enlarged-diameter tubular portion extending outward from the small-diameter tubular portion and extending in the axial direction of the small-diameter tubular portion, and an inner peripheral surface of the enlarged-diameter tubular portion. and an auxiliary cylindrical portion extending axially from the closed surface portion and through which the wire harness is inserted, the closed surface portion extending in the circumferential direction. Some have bellows portions in which portions and troughs are alternately provided (see, for example, Patent Document 1). In this grommet, the bellows portion is provided on the closed surface portion that supports the auxiliary cylindrical portion through which the wire harness is passed, so that the grommet can flexibly follow the pull-out direction of the wire harness.

JP 2017-10638 A

By the way, when there is a structure or the like in the vicinity of the point at which the wire harness is pulled out, the routing route of the wire harness becomes a route that bends sharply. In this case, the auxiliary tubular portion through which the wire harness is inserted also needs to be sharply bent, but it is difficult to follow the sudden bending of the auxiliary tubular portion by forming the bellows portion on the closed surface portion.

In the grommet described in Patent Literature 1, since the closed surface portion is provided with slits along the radial direction, the bellows portion is easily deformed and it is believed that it can follow sudden bending to some extent. However, in this grommet, since the slit is formed over the portion where the bellows portion is formed in the closed surface portion, the closed surface portion becomes loose due to the sudden bending of the wire harness, and the auxiliary tubular portion hangs down, which makes it difficult to support the wire harness. It becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to enable the wire harness to follow the bending of the wire harness satisfactorily regardless of the pulled-out state, and to stably support the wire harness. To provide a possible grommet.

In order to achieve the above object, a grommet according to the present invention is characterized by the following (1) to (4).
(1) A grommet comprising an exterior cylindrical portion through which a wire harness is inserted and a panel attachment portion attached to a panel,
The panel mounting part is
a recessed hood that is fitted into a mounting hole formed in the panel and assembled to the panel;
a planar portion provided so as to cover one surface side of the receptacle;
a harness support portion having a pair of support pieces extending in a direction opposite to the hood portion along a peripheral surface of the wire harness drawn out from the planar portion and fixed to the wire harness;
with
The planar portion is
an opening that is formed at the base of the harness support portion and bulges in a direction orthogonal to the arrangement of the support pieces so as to connect to the gap between the support pieces through which the wire harness is passed;
a bellows portion composed of ridges and troughs formed alternately in a radial direction in a circumferential direction so as to surround the harness support portion and the opening;
has
The peaks and valleys formed alternately in the radial direction of the planar portion exist only on the outer peripheral side of the opening.
A grommet characterized by:
(2) The opening is
a large-diameter portion formed on the harness support portion side;
a small-diameter portion having a radius of curvature smaller than that of the large-diameter portion, the small-diameter portion being formed continuously from a part of the peripheral edge of the large-diameter portion;
The grommet according to (1), characterized by comprising:
(3) a reinforcing rib is formed on the edge of the opening;
The grommet according to (1) or (2), wherein the reinforcing rib is connected to the support piece.
(4) Any one of (1) to (3), wherein the panel mounting portion has an outer shape that is long in a direction perpendicular to the bending direction of the wire harness that is pulled out in a front view. grommet as described.

According to the grommet having the above configuration (1), the bellows portion of the planar portion expands and contracts, so that the grommet can follow the bending of the wire harness supported by the harness support portion. Therefore, deformation of the outer shape of the panel mounting portion can be suppressed, and good sealing performance in the mounting hole of the panel can be ensured.
In particular, even if the wire harness to be pulled out is bent sharply and routed, since the opening is provided at the base of the harness supporting portion, the planar portion is smoothly elastically deformed to follow the bending. be able to. Moreover, since the bellows portion is provided so as to surround the outer periphery of the harness supporting portion and the opening, the planar portion is given appropriate rigidity and is elastically deformed without slack, compared to the case where slits are formed over the bellows portion. be able to. As a result, the harness supporting portion can follow bending of the wire harness while maintaining a good supporting state of the wire harness.
According to the grommet having the configuration (2), the large-diameter portion enhances the flexibility of the bellows portion to ensure good flexibility of the planar portion. Elastic deformation can be suppressed, and loosening of the planar portion due to sudden bending of the wire harness can be suppressed.
According to the grommet having the above configuration (3), the reinforcing ribs connected to the support pieces are formed at the edge of the opening to reinforce the root portion of the harness support portion, thereby increasing the rigidity and improving the rigidity of the planar portion. Looseness can be further suppressed.
According to the grommet having the configuration of (4) above, the bellows portion can have a large elongation, and can follow the bending of the wire harness satisfactorily.

ADVANTAGE OF THE INVENTION According to this invention, the grommet which can be made to follow the bending of a wire harness satisfactorily regardless of a pulled-out state, and can support a wire harness stably moreover can be provided.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following detailed description of the invention (hereinafter referred to as "embodiment") with reference to the accompanying drawings. .

FIG. 1 is a perspective view of a grommet according to this embodiment. 2A and 2B are views showing the grommet according to the present embodiment, FIG. 2A being a side view and FIG. 2B being a front view. 3A and 3B are views showing the grommet according to the present embodiment, FIG. 3A is a cross-sectional view along AA in FIG. 2B, and FIG. It is a cross-sectional view. 4A and 4B are diagrams showing the mounted state of the grommet, FIG. 4A being a side view and FIG. 4B being a front view. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4(b) showing the mounting state of the grommet.

Hereinafter, examples of embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a grommet according to this embodiment. 2A and 2B are views showing the grommet according to the present embodiment, FIG. 2A being a side view and FIG. 2B being a front view. 3A and 3B are views showing the grommet according to the present embodiment, FIG. 3A is a cross-sectional view along AA in FIG. 2B, and FIG. It is a sectional view.

As shown in FIGS. 1 to 3, the grommet 10 according to the present embodiment is attached to a wire harness W consisting of a wire bundle in which a plurality of wires are bundled, and is integrally molded from an elastic material such as rubber or elastomer. It is

The grommet 10 includes a panel mounting portion 11 and an outer tubular portion 12 , and the outer tubular portion 12 is formed integrally with the panel mounting portion 11 . The outer tubular portion 12 is formed in a tubular shape and is connected to the panel mounting portion 11 . A wire harness W is inserted through the exterior tubular portion 12 , and the outer peripheral side of the wire harness W is covered and protected by the exterior tubular portion 12 . The outer tubular portion 12 is formed in a bellows shape and is extendable in the axial direction.

The grommet 10 is assembled to the panel P by fitting the panel mounting portion 11 into a mounting hole Pa formed in the panel P of the body or door of a vehicle such as an automobile, for example. The mounting hole Pa of the panel P is formed in an elliptical shape, and the panel mounting portion 11 fitted in the mounting hole Pa is also formed in an elliptical shape when viewed from the front.

The panel mounting portion 11 of the grommet 10 includes a hood portion 21 , a planar portion 22 and a harness support portion 23 .

The hood portion 21 is formed in a concave shape having a peripheral wall portion 24 and a bottom wall portion 25 , and the outer tubular portion 12 is connected to the bottom wall portion 25 . The peripheral wall portion 24 is formed with an annular base portion 26 projecting to the outer peripheral side, and an engaging groove portion 27 is formed at the root of the base portion 26 on the bottom wall portion 25 side. By fitting the panel mounting portion 11 into the mounting hole Pa of the panel P, the edge of the mounting hole Pa of the panel P is engaged with the engaging groove portion 27 . Thereby, the grommet 10 is attached to the panel P while ensuring the sealing performance.

The planar portion 22 is provided on the side of the peripheral wall portion 24 of the hood portion 21 opposite to the bottom wall portion 25 . As a result, the hood portion 21 formed in a concave shape is covered with the planar portion 22 on one side opposite to the bottom wall portion 25 and closed.

The harness support portion 23 is provided at the center position of the planar portion 22 . The harness support portion 23 has a pair of support pieces 31 . These support pieces 31 are connected to the planar portion 22 and extend on the opposite side of the hood portion 21 to the exterior tubular portion 12 . These support pieces 31 are arranged with a gap G between them, and are formed in an arcuate cross-sectional view in which the opposing sides thereof are recessed.

A wire harness W, which is passed through the exterior tubular portion 12 and pulled out from the panel mounting portion 11 , is passed through the harness support portion 23 through a gap G between the support pieces 31 . In the harness support portion 23, the tape T is wound around the wire harness W together with the support piece 31, thereby fixing the wire harness W to the harness support portion 23 and supporting it. The wire harness W supported by the harness support portion 23 can be bent in the width direction of the panel mounting portion 11 and routed. That is, the grommet 10 has an elongated outer shape in which the panel mounting portion 11 is elongated in a direction orthogonal to the bending direction of the wire harness W in a front view.

The planar portion 22 is formed in the shape of a thin film. The planar portion 22 has an opening 41 and a bellows portion 45 .

The openings 41 are formed on both sides of the harness support portion 23 so as to connect to the gaps G between the support pieces 31 of the harness support portion 23 . The opening 41 is formed at the root portion of the support piece 31 in the planar portion 22 so as to bulge in a direction orthogonal to the arrangement of the support piece 31 . The opening 41 has a large diameter portion 42 and a small diameter portion 43 . The small diameter portion 43 has a smaller radius of curvature than the large diameter portion 42 . The large-diameter portion 42 is formed on the support piece 31 side, and the small-diameter portion 43 is formed continuously with a portion of the peripheral edge of the large-diameter portion 42 at the intermediate position of each support piece 31 . A reinforcing rib 44 projecting in the extending direction of the harness support portion 23 is formed at the edge of the opening 41 having the large diameter portion 42 and the small diameter portion 43 . The reinforcing rib 44 is connected to each support piece 31 of the harness support portion 23 .

The bellows portion 45 has a peak portion 46 and a valley portion 47 . In a cross-sectional view, the peaks 46 protrude toward the surface of the planar portion 22 in the extending direction of the harness supporting portion 23 , and the valleys 47 extend in the planar portion 22 opposite to the extending direction of the harness supporting portion 23 . It is recessed to the back side of the side. These peaks 46 and valleys 47 are formed in the circumferential direction. The bellows portion 45 is formed so as to surround the harness support portion 23 provided at the central position of the planar portion 22 and the outer periphery of the opening portion 41 .

Next, a case of installing the grommet 10 according to this embodiment will be described.
First, the wire harness W is attached with the grommet 10 . Specifically, the wire harness W is inserted through the outer tubular portion 12 of the grommet 10 . Then, the wire harness W is pulled out from the gap G between the support pieces 31 of the harness support portion 23 provided on the planar portion 22 of the panel mounting portion 11, and the tape T is attached to the pulled out wire harness W together with the support piece 31. , and the wire harness W is fixed to the harness support portion 23 .

Next, the outer tubular portion 12 is inserted into the mounting hole Pa of the panel P, the panel mounting portion 11 of the grommet 10 is fitted into the mounting hole Pa, and the edge of the mounting hole Pa is engaged with the engaging groove portion 27 . The grommet 10 is thereby assembled to the panel P. After assembling the grommet 10 to the panel P, the wire harness W pulled out from the panel mounting portion 11 of the grommet 10 is routed along a preset route.

4A and 4B are diagrams showing the mounted state of the grommet, FIG. 4A being a side view and FIG. 4B being a front view. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4(b) showing the mounting state of the grommet.

For example, when wiring the wire harness W pulled out from the panel mounting portion 11 of the grommet 10 inside the door of a vehicle, etc., there is glass or the like in the vicinity of the pull-out portion of the wire harness W with respect to the panel mounting portion 11 of the grommet 10. A structure may be placed.

In such a case, as shown in FIGS. 4(a), 4(b) and 5, the wire harness W pulled out from the panel mounting portion 11 of the grommet 10 is sharply bent so as not to interfere with the structure S. There is a need to. When the wire harness W pulled out from the panel mounting portion 11 of the grommet 10 is sharply bent in this manner, the harness support portion 23 fixed to the wire harness W is strongly pulled by the support piece 31 on the outside of the bend, and the wire harness W is bent. is strongly compressed. Then, the planar portion 22 of the panel mounting portion 11 is elastically deformed by the tension and compression of the support piece 31 . Specifically, on the outside of the bend, the peaks 46 and the valleys 47 of the bellows portion 45 are stretched and the planar portion 22 is pulled forward. In addition, inside the bend, the peaks 46 and the valleys 47 of the bellows portion 45 are compressed to press against each other, and the planar portion 22 is pushed.

Thus, in the grommet 10 according to the present embodiment, the bellows portion 45 of the planar portion 22 expands and contracts, so that the bending of the wire harness W supported by the harness support portion 23 can be followed. Therefore, deformation of the outer shape of the panel mounting portion 11 can be suppressed, and good sealing performance in the mounting hole Pa of the panel P can be ensured.

In particular, even when the wire harness W to be pulled out is bent sharply and routed, the opening 41 is provided at the base of the harness support portion 23, so that the planar portion 22 is smoothly elastically deformed. It can follow bending. Moreover, since the bellows portion 45 is provided so as to surround the outer periphery of the harness support portion 23 and the opening portion 41, the planar portion 22 is provided with appropriate rigidity and is looser than a slit formed over the bellows portion. It can be elastically deformed without As a result, the harness supporting portion 23 can follow the bending of the wire harness W while maintaining a good supporting state of the wire harness W.

Further, the opening 41 has a smaller radius of curvature than the large-diameter portion 42 formed on the harness support portion 23 side and is formed continuously with a part of the periphery of the large-diameter portion 42 . and a small diameter portion 43 . Therefore, the large-diameter portion 42 enhances the flexibility of the bellows portion 45 to ensure good flexibility of the planar portion 22, and the small-diameter portion 43 suppresses excessive elastic deformation of the planar portion 22. Loosening of the planar portion 22 due to sudden bending of the wire harness W can be suppressed.

In addition, since the reinforcing ribs 44 connected to the supporting pieces 31 of the harness supporting portion 23 are formed at the edge of the opening 41, the base portion of the harness supporting portion 23 is reinforced to increase the rigidity, thereby increasing the rigidity of the planar portion. 22 can be further suppressed.

In addition, the panel mounting portion 11 has an elongated outer shape elongated in a direction perpendicular to the bending direction of the wire harness W to be pulled out in a front view. Therefore, the extension margin of the bellows portion 45 can be increased, and the bending of the wire harness W can be well followed.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.

Here, the features of the embodiment of the grommet according to the present invention described above are briefly summarized in [1] to [4] below and listed.
[1] A grommet (10) comprising an exterior tubular portion (12) through which a wire harness (W) is inserted and a panel mounting portion (11) mounted on a panel (P),
The panel mounting part (11)
a recessed hood portion (21) that is fitted into a mounting hole (Pa) formed in the panel (P) and assembled to the panel (P);
a planar portion (22) provided to cover one surface side of the hood portion (21);
A pair of support pieces extending to the side opposite to the hood portion (21) along the peripheral surface of the wire harness (W) pulled out from the planar portion (22) and fixed to the wire harness (W). a harness support (23) having (31);
with
The planar portion (22) is
perpendicular to the arrangement of the support pieces (31) so as to be connected to the gap (G) between the support pieces (31) formed at the root portion of the harness support portion (23) and through which the wire harness (W) is passed; an opening (41) that bulges in the direction of
A bellows portion (45) comprising peaks (46) and valleys (47) formed alternately in the radial direction along the circumference so as to surround the harness support portion (23) and the opening (41). and,
A grommet comprising:
[2] The opening (41) is
a large diameter portion (42) formed on the harness support portion (23) side;
a small diameter portion (43) having a radius of curvature smaller than that of the large diameter portion (42) and formed continuously from a portion of the periphery of the large diameter portion (42);
The grommet according to [1], characterized by having:
[3] A reinforcing rib (44) is formed on the edge of the opening (41),
The grommet according to [1] or [2], wherein the reinforcing rib (44) is connected to the support piece (31).
[4] From [1] to [3], the panel mounting portion (11) has an outer shape that is long in a direction perpendicular to the bending direction of the wire harness (W) that is pulled out in a front view. ] The grommet according to any one of .

10: Grommet 11: Panel mounting portion 12: Exterior cylinder portion 21: Hood portion 22: Planar portion 23: Harness support portion 31: Support piece 41: Opening portion 42: Large diameter portion 43: Small diameter portion 44: Reinforcement rib 45: Accordion portion 46: Mountain portion 47: Valley portion G: Gap P: Panel Pa: Mounting hole W: Wire harness

Claims (4)

A grommet comprising an exterior tubular portion through which a wire harness is inserted and a panel mounting portion mounted on a panel,
The panel mounting part is
a recessed hood that is fitted into a mounting hole formed in the panel and assembled to the panel;
a planar portion provided so as to cover one surface side of the receptacle;
a harness support portion having a pair of support pieces extending in a direction opposite to the hood portion along a peripheral surface of the wire harness drawn out from the planar portion and fixed to the wire harness;
with
The planar portion is
an opening that is formed at the base of the harness support portion and bulges in a direction orthogonal to the arrangement of the support pieces so as to connect to the gap between the support pieces through which the wire harness is passed;
a bellows portion composed of ridges and troughs formed alternately in a radial direction in a circumferential direction so as to surround the harness support portion and the opening;
has
The peaks and valleys formed alternately in the radial direction of the planar portion exist only on the outer peripheral side of the opening.
A grommet characterized by: The opening is
a large-diameter portion formed on the harness support portion side;
a small-diameter portion having a radius of curvature smaller than that of the large-diameter portion, the small-diameter portion being formed continuously from a part of the peripheral edge of the large-diameter portion;
The grommet of claim 1, comprising: A reinforcing rib is formed on the edge of the opening,
The grommet according to claim 1 or 2, wherein the reinforcing rib is connected to the support piece. The grommet according to any one of claims 1 to 3, wherein the panel mounting portion has an outer shape elongated in a direction orthogonal to a bending direction of the wire harness to be pulled out in a front view.

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