JP2017118621A - Grommet and wire with grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flexibility of a grommet.SOLUTION: A grommet 100 is formed in a cylindrical shape that allows a wire 9 to be inserted, and includes a cornice part 1 in which a large diameter part 2 and a small diameter part 3 are alternately connected in an extended direction of the grommet 100, and can be bent and deformed. A width in the extended direction of the grommet 100 of a concave vent part 41 as a part of the large diameter that is formed in a convex shape in bent becomes larger at a first position 21 in a peripheral direction of the grommet 100 than a second position 22 on the side opposite to the first position 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a grommet for protecting an electric wire and an electric wire with a grommet.

  For example, as shown in Patent Document 1, a wire harness may be inserted into a grommet including bellows portions in which large diameter portions and small diameter portions are alternately formed along the extending direction.

JP 2014-204530 A

  However, in the example shown in Patent Document 1, when trying to bend the grommet, the grommet may be difficult to bend due to contact between adjacent large diameter portions in the extending direction of the grommet.

  An object of this invention is to improve the flexibility of a grommet.

  The grommet according to the first aspect is formed in a cylindrical shape through which an electric wire can be inserted, and includes a bellows portion that can be bent and deformed by alternately connecting a large diameter portion and a small diameter portion in the extending direction. The convex curved portion, which is a curved portion, is formed such that the width in the extending direction is larger at the first position in the circumferential direction than at the second position opposite to the first position. .

  The grommet which concerns on a 2nd aspect is one aspect | mode of the grommet which concerns on a 1st aspect, Comprising: As it goes to said 2nd position from said 1st position along the said circumferential direction, the said extension direction of the said convex curved part The width at is gradually reduced.

  The grommet according to the third aspect is one aspect of the grommet according to the first aspect or the second aspect, and passes through the first position and the second position, and is seen in a cross section along the extending direction. The curvature of the convex curved portion at the first position is smaller than the curvature of the convex curved portion at the second position.

  The grommet according to the fourth aspect is one aspect of the grommet according to any one of the first aspect to the third aspect, passes through the first position and the second position, and extends along the extending direction. When viewed in a cross section, a concave valley portion that forms the small diameter portion is formed in a V shape at the second position.

  The electric wire with a grommet which concerns on a 5th aspect is provided with the grommet which concerns on any one of a 1st aspect to a 4th aspect, and the electric wire penetrated by the said grommet.

  In each of the above aspects, the width in the extending direction of the convex curved portion that is a convex curved portion at the first position in the circumferential direction of the large diameter portion is the second position on the opposite side to the first position. It is formed so as to be larger than the width in the extending direction of the convex curved portion. In this case, when the grommet is bent with the second position side as the inner side in the bending direction, it is possible to prevent the adjacent convex curved portions from contacting each other in the extending direction, thereby improving the bendability of the grommet.

  In the 2nd mode, it forms so that the width in the extending direction of a convex curved part may become small gradually as it goes to the 2nd position from the 1st position along the peripheral direction. In this case, it becomes easier to bend the grommet with the second position side as the inner side in the bending direction. That is, it is possible to obtain a grommet that is easily bent in a specific direction (the second position side is inward).

  In the third aspect, the curvature of the convex curved portion at the first position is equal to that of the convex curved portion at the second position when viewed in a cross section passing through the first position and the second position and extending in the extending direction. It is smaller than the curvature. In this case, when the grommets are bent, the convex curved portions of the large-diameter portions adjacent in the extending direction of the grommets on the second position side are more difficult to contact.

  In the fourth aspect, a concave valley portion forming a small diameter portion is formed in a V shape at the second position when viewed in a cross section along the extending direction through the first position and the second position. . In this case, when the grommet is bent with the second position side as the inner side in the bending direction, it is deformed so that the concave valley at the second position side is folded. For this reason, it becomes deformable so that the convex curved parts adjacent in the extending direction of the grommet on the second position side are closer to each other. This makes it easier to bend the grommet with the second position side as the inner side in the bending direction.

  Also in the fifth aspect, when the grommet is bent with the second position side as the inner side in the bending direction, it is possible to prevent the adjacent convex curved portions in the extending direction from contacting each other, and the flexibility of the grommet is improved. .

It is a perspective view of the grommet concerning an embodiment. It is a side view of the grommet concerning an embodiment. It is sectional drawing of the grommet which concerns on embodiment. It is sectional drawing of the grommet which concerns on embodiment. It is a partial expanded sectional view of the grommet concerning an embodiment. It is a partial expanded sectional view of the grommet concerning an embodiment.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

<Embodiment>
The grommet 100 and the electric wire 101 with the grommet according to the embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the grommet 100. FIG. 2 is a side view of the grommet 100. In FIG. 2, the electric wire 9 inserted through the grommet 100 is drawn with a virtual line (two-dot chain line). 3 and 4 are cross-sectional views of the grommet 100, respectively. FIG. 3 is a cross section cut along a cutting line along the extending direction of the grommet 100. FIG. 4 is a cross section cut along a cutting line orthogonal to the extending direction of the grommet 100. 5 and 6 are enlarged views of a part of FIG. 5 and 6 are partially enlarged sectional views of the grommet 100. FIG.

  As shown in FIG. 1, the grommet 100 is formed in a cylindrical shape through which the electric wire 9 can be inserted. The grommet 100 includes a bellows portion 1 that can be bent and deformed by alternately connecting the large diameter portion 2 and the small diameter portion 3 in the extending direction.

  Moreover, in this embodiment, the grommet 100 is further provided with the attaching part 5 provided in the both sides of the bellows part 1, respectively. The attachment portion 5 is a portion for attaching the grommet 100 to the counterpart member. Here, the attachment portion 5 is formed with a recess along the circumferential direction that can be attached to the inner peripheral edge portion of the through hole of the counterpart member. In this case, the grommet 100 is attached to the counterpart member by fitting the attachment portion 5 into a through hole formed in the plate-like counterpart member. As the plate-like mating member, for example, a metal panel constituting a vehicle body can be considered. The grommet 100 is attached to the mating member for the purpose of protecting the electric wire inserted through the through hole from the inner edge of the through hole and waterproofing.

  Further, the grommet 100 may be a rubber member that can be bent and expanded / contracted at the bellows portion 1, for example.

  The bellows portion 1 of the grommet 100 will be described. As described above, the bellows portion 1 includes the large diameter portion 2 and the small diameter portion 3. The large diameter portion 2 is a portion having a relatively large diameter in the bellows portion 1, and the small diameter portion 3 is a portion having a relatively small diameter in the bellows portion 1.

  The bellows portion 1 will be described more specifically. Here, the bellows portion 1 includes a convex curved portion 41, a concave valley portion (hereinafter, concave valley portion 42), and an intermediate portion 43 that connects the convex curved portion 41 and the concave valley portion 42.

  As shown in FIGS. 3, 5, and 6, the convex curved portion 41 includes a portion having the largest diameter, that is, a portion that includes the portion that protrudes to the outermost peripheral side of the grommet 100 and is bent. is there. That is, the convex curved portion 41 includes only a portion bent so as to be convex toward the outer peripheral side. For example, the convex curved portion 41 may be a portion that is curved so as to be convex toward the outer peripheral side or a portion that is sharply bent toward the outer peripheral side (inverted V-shaped portion). Further, the convex curved portion 41 constitutes part or all of the large diameter portion 2.

  And in this embodiment, the width | variety in the extending direction of the grommet 100 of the convex curved part 41 in the several position in the circumferential direction of the grommet 100 differs. Here, two predetermined positions in the circumferential direction of the grommet 100 are defined as a first position 21 and a second position 22. As shown in FIG. 4, the second position 22 is a position opposite to the first position 21.

  In the grommet 100, the width in the extending direction of the convex curved portion 41 of the large diameter portion 2 is the first position 21 in the circumferential direction of the grommet 100 than the second position 22 on the opposite side to the first position 21. Is also formed to be large. That is, the convex curved portion 41 at the second position 22 opposite to the first position 21 has a width in the extending direction of the convex curved portion 41 at the first position 21 in the circumferential direction of the large diameter portion 2. It is formed to be larger than the width in the extending direction. In this case, when the grommet 100 is bent with the second position 22 side as the inner side of bending, the convex curved portions 41 adjacent in the extending direction of the grommet 100 are difficult to contact each other. For this reason, it becomes possible to bend the grommet 100 more.

  Here, the width of the convex curved portion 41 is the largest at the first position 21, and the width of the convex curved portion 41 is the smallest at the second position 22.

  Further, as shown in FIGS. 2 and 3, the width of the convex curved portion 41 in the extending direction of the grommet 100 as it goes from the first position 21 to the second position 22 along the circumferential direction of the grommet 100. Is formed to gradually become smaller. This case has the following advantages. That is, as another example, when the area of the convex curved portion 41 is relatively small in the circumferential direction of the grommet 100 and the area of the convex curved portion 41 is relatively small, the grommet Can be easily bent in various directions. On the other hand, in the present embodiment, the convex curved portion 41 is formed so that the width in the extending direction of the grommet 100 gradually decreases as it goes from the first position 21 to the second position 22 along the circumferential direction of the grommet 100. Therefore, the grommet 100 is particularly easy to bend with the second position 22 side as the inner side in the bending direction. That is, the grommet 100 is easily bent in a specific direction.

  Here, the curvature of the convex curved portion 41 at the first position 21 is the second position when viewed in a cross section passing through the first position 21 and the second position 22 and along the extending direction of the grommet 100. 22 is smaller than the curvature of the convex curved portion 41. That is, at the first position 21, the convex curved portion 41 protrudes to the outer peripheral side while being relatively gently curved. On the other hand, at the second position 22, the convex curved portion 41 protrudes to the outer peripheral side while curving relatively abruptly. In this case, when the grommet 100 is bent, the convex curved portions 41 adjacent to each other in the extending direction of the grommet 100 are less likely to contact each other on the second position 22 side. This is because, on the second position 22 side, the interval between the convex curved portions 41 adjacent in the extending direction of the grommet 100 can be increased.

  Next, the concave valley portion 42 will be described. As shown in FIGS. 3, 5, and 6, the concave valley portion 42 includes a portion having the smallest diameter, that is, a portion that is recessed in the innermost side of the grommet 100. The concave valley portion 42 forms part or all of the small diameter portion 3.

  Further, here, as shown in FIG. 6, a concave valley that forms the small diameter portion 3 at the second position 22 as viewed in a cross section passing through the first position 21 and the second position 22 and extending in the extending direction. The part 42 is formed in a V shape. That is, the concave valley portion 42 at the second position 22 is formed to be concave while being sharply curved as compared to the concave valley portion 42 at the first position 21. As seen from the cross section, at the first position 21, the concave valley portion 42 is formed to be concave while being curved relatively gently. In this case, when the grommet 100 is bent with the second position 22 side as the inner side in the bending direction, the concave valley portions 42 on the second position 22 side are folded so that the adjacent convex curved portions 41 are adjacent to each other. Deform in the approaching direction. For this reason, it becomes easier to bend the grommet 100 with the second position 22 side as the inner side in the bending direction. In addition, it is preferable that the concave valley part 42 is formed in the 2nd position 22 so that two linear parts may form the angle and may be dented.

  From the above, the convex curved portion 41 is a portion that passes through the first position 21 and the second position 22 and is convex while being curved toward the outer peripheral side when viewed in a cross section along the extending direction of the grommet 100. On the other hand, the concave valley portion 42 is a portion that passes through the first position 21 and the second position 22 and is convex on the inner peripheral side (concave on the outer peripheral side) when viewed in a cross section along the extending direction of the grommet 100. is there. The convex curved portion 41 and the concave valley portion 42 are connected via an intermediate portion 43.

  That is, the intermediate portion 43 is a portion that is provided between the convex curved portion 41 and the concave valley portion 42 in the extending direction of the grommet 100 and connects the two. For this reason, the intermediate part 43 does not include the largest diameter part and the smallest diameter part of the bellows part 1. The intermediate part 43 constitutes a part of the large diameter part 2, a part of the small diameter part 3, or a part of the large diameter part 2 and the small diameter part 3.

  Here, the width of the intermediate portion 43 in the extending direction of the grommet 100 at a plurality of positions in the circumferential direction of the grommet 100 is different. That is, as shown in FIGS. 2, 3, 5, and 6, the width of the intermediate portion 43 at the first position 21 is formed to be smaller than the width of the intermediate portion 43 at the second position 22. .

  Further, here, the width in the extending direction of the intermediate portion 43 is gradually increased as it goes from the first position 21 to the second position 22 along the circumferential direction of the grommet 100. Here, although the width | variety in each position differs in the circumferential direction of the grommet 100 here, the intermediate part 43 is formed over the perimeter. However, there may be a case where the intermediate portion 43 is not formed in only a part of the grommet 100 in the circumferential direction. For example, the case where the intermediate part 43 is formed in the area | region except the 1st position 21 in the circumferential direction of the grommet 100 is also considered. That is, it may be considered that the intermediate portion 43 is not formed at the first position 21 and the convex curved portion 41 and the concave valley portion 42 are directly connected.

  Next, the electric wire 101 with grommet will be described. As illustrated in FIG. 2, the grommet-equipped electric wire 101 includes a grommet 100 and an electric wire 9 inserted through the grommet 100. It is conceivable that the electric wire 9 is an insulated wire including a core wire and an insulating coating covering the periphery of the core wire, for example. Further, one or a plurality of electric wires 9 are inserted through the grommet 100.

<Effect>
As described above, in the present embodiment, the width in the extending direction of the convex curved portion 41 that is the convex bent portion of the large diameter portion 2 is the first position 21 in the circumferential direction of the grommet 100 at the first position 21. It is formed to be larger than the second position 22 on the opposite side to the one position 21. In this case, when the grommet 100 is bent with the second position 22 side as the inner side in the bending direction, it is possible to prevent the adjacent convex curved portions 41 from contacting each other in the extending direction, and the bendability of the grommet 100 is improved. improves.

  Moreover, in this embodiment, it forms so that the width | variety in the extending direction of the convex curved part 41 may become small gradually as it goes to the 2nd position 22 from the 1st position 21 along the circumferential direction. In this case, it becomes easier to bend the grommet 100 with the second position 22 side in the bending direction. That is, it is possible to obtain the grommet 100 that is easily bent in a specific direction (the second position 22 side inward).

  Moreover, in this embodiment, the curvature of the convex curved part 41 in the 1st position 21 sees in the cross section which passes along the 1st position 21 and the 2nd position 22, and extends in the 2nd position 22. It is smaller than the curvature of the convex curved portion 41 at. In this case, when the grommet 100 is bent, the convex curved portions 41 of the large-diameter portion 2 adjacent to each other in the extending direction of the grommet 100 on the second position 22 side are more difficult to contact each other.

  Moreover, in this embodiment, the concave valley part 42 which comprises the small diameter part 3 in the 2nd position 22 sees in the cross section which passes along the 1st position 21 and the 2nd position 22, and extends, and is V-shaped. It is formed in a shape. In this case, when the grommet 100 is bent with the second position 22 side as the inner side in the bending direction, the concave valley portion 42 on the second position 22 side is deformed so as to be folded. For this reason, it becomes deformable so that the convex curved parts 41 adjacent in the extending direction of the grommet 100 on the second position 22 side are closer to each other. This makes it easier to bend the grommet 100 with the second position 22 side as the inner side in the bending direction.

<Application example>
It is also conceivable that a portion having a constant width in the extending direction of the grommet of the convex curved portion is formed in a partial section from the first position to the second position.

  Moreover, the case where the width | variety in the extending direction of the grommet of a convex-shaped curved part is the largest at the 1st position, and the case where it is the smallest at positions other than a 2nd position is also considered.

  The grommets and electric wires with grommets according to the present invention can be freely combined within the scope of the invention described in each claim, or the embodiments and application examples can be appropriately combined. It is also possible to configure by deforming or omitting a part.

DESCRIPTION OF SYMBOLS 1 Bellows part 100 Grommet 101 Electric wire with a grommet 2 Large diameter part 21 First position 22 Second position 3 Small diameter part 41 Convex curved part 42 Concave trough part 9 Electric wire

Claims (5)

It is formed in a cylindrical shape that can be inserted with electric wires,
Including a bellows portion in which the large-diameter portion and the small-diameter portion are alternately and continuously bent in the extending direction,
The width in the extending direction of the convex curved portion which is a convex bent portion of the large diameter portion is larger at the first position in the circumferential direction than at the second position on the opposite side to the first position. Grommet that is formed to be. The grommet according to claim 1,
The grommet formed so that the width in the extending direction of the convex curved portion gradually decreases as it goes from the first position to the second position along the circumferential direction. The grommet according to claim 1 or 2, wherein
The curvature of the convex curved portion at the first position is the convex curvature at the second position when viewed in a cross section passing through the first position and the second position and along the extending direction. Grommet smaller than the curvature of the part. The grommet according to any one of claims 1 to 3, wherein
A concave valley portion that forms the small diameter portion is formed in a V shape in the second position when viewed in a cross section passing through the first position and the second position and extending in the extending direction. , Grommet. The grommet according to any one of claims 1 to 4,
An electric wire with a grommet, comprising: an electric wire inserted through the grommet.

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