JP2019198136A - Grommet - Google Patents

Abstract

To provide a grommet capable of easily bending wires passing through respective cylinder parts so that they follow a vehicle body panel.SOLUTION: A grommet 10 comprises: a large diameter cylinder part 11 assembled to a vehicle body panel 8; a small diameter cylinder part 18 through which a wire 9 such as a wire harness pass; and an intermediate cylinder part 15 which has flexibility and connects between the large diameter cylinder part 11 and the small diameter cylinder part 18. Scooped releasing parts 12 and 13 are arranged in a portion facing a region in a bending direction X of the small diameter cylinder part 18 on a front face 11a-side of the large diameter cylinder part 11 and a portion facing a region opposite to a region in a bending direction X of the small diameter cylinder part 18 on a rear face 11b-side of the large diameter cylinder part 11. The wires 9 are made flexible to sides of the respective releasing parts 12 and 13 disposed on both of the front and rear faces 11a and 11b of the large diameter cylinder part 11.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a grommet that is attached to a body panel of an automobile or the like and allows an electric wire such as a wire harness to be inserted therein.

  As this type of grommet, for example, those described in Patent Documents 1 to 4 are known.

  The grommet described in Patent Literature 1 is provided with a slack portion capable of absorbing the extension of the bent portion at the base portion of the small diameter cylindrical portion corresponding to the region opposite to the bending direction of the small diameter cylindrical portion through which the wire harness is inserted. When a harness (small diameter cylinder) is bent and routed at a substantially right angle along the body panel on the engine room side, the slack part is inflated outward so that the small diameter cylinder can be bent at a substantially right angle. ing.

  In addition, the grommet described in Patent Document 2 is provided with a bellows portion on the panel mounting portion continuous side of the cylindrical wire harness insertion portion, and a thin portion is provided at a portion facing the bellows portion in the radial direction, The wire harness insertion portion can be bent so as to be in a parallel state.

  In addition, the grommet described in Patent Document 3 is configured so that the wire harness is disposed along the panel on the outer peripheral surface of the intermediate portion between the large-diameter cylindrical portion fitted into the hole of the panel and the small-diameter cylindrical portion penetrating and holding the wire harness. A rib-like annular thick portion that acts as a bending point when bent is provided to block the bending force associated with the bending of the wire harness at the bending point.

  Furthermore, the grommet described in Patent Document 4 can be provided with a bellows portion as a flexible portion that can be bent at the base of a small-diameter cylindrical portion through which an electric wire is inserted, and the small-diameter cylindrical portion into which the electric wire has been inserted can be tilted in a desired direction. I am doing so.

  Furthermore, the grommet described in Patent Document 5 is provided with folds on the side surface of the enlarged diameter cylindrical portion between the cylindrical portion through which the wire bundle is inserted and the connector fitting portion that holds the connector inside, and the cylindrical portion is It absorbs tensile stress by opening the fold when folded.

JP 2001-251737 A JP 7-21863 A JP-A-7-14442 JP 2001-160329 A JP 2006-339116 A

  In the conventional grommet, when the wire harness is passed through the vehicle body, the grommet is attached to the vehicle body panel via the grommet, but the length of the bellows portion or the like provided in the small diameter cylindrical portion of the grommet is uniform in all directions. Since it is assumed that the harness is routed straight, when the wire harness is bent along the vehicle body panel after passing through the small-diameter cylinder, the length of the bellows provided in the small-diameter cylinder It is difficult to bend the wire harness along the vehicle body panel due to the shortage of the length or the large diameter cylindrical portion as the base portion of the grommet and the bent wire harness interfering with each other.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a grommet that can easily bend an electric wire penetrating each tubular portion along a vehicle body panel.

  The present invention is a grommet, which has a large-diameter cylindrical portion assembled to a vehicle body panel, a small-diameter cylindrical portion through which an electric wire penetrates, and has flexibility, and the large-diameter cylindrical portion and the small-diameter cylindrical portion are arranged in series. An intermediate tube portion, and a portion facing the bending direction region of the small diameter tube portion on the surface side of the large diameter tube portion and a bending direction region of the small diameter tube portion on the back surface side of the large diameter tube portion Of the portion facing the opposite side region, at least the portion on the back surface side of the large-diameter cylindrical portion is provided with a beaten relief portion.

  According to the present invention, the electric wire penetrating the large-diameter cylindrical portion, the intermediate cylindrical portion, and the small-diameter cylindrical portion can be easily bent along the vehicle body panel by the relief portion provided in the large-diameter cylindrical portion.

It is a top view which shows the grommet of one Embodiment of this invention. It is a bottom view of the grommet. It is sectional drawing at the time of the wire harness production of the said grommet. It is sectional drawing at the time of the vehicle assembly | attachment of the said grommet. It is sectional drawing of the grommet of the comparative example at the time of the said vehicle assembly | attachment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 is a plan view showing a grommet according to an embodiment of the present invention, FIG. 2 is a bottom view of the grommet, FIG. 3 is a cross-sectional view of the grommet when the wire harness is produced, and FIG. 4 is a cross-section of the grommet when the vehicle is assembled. FIG. 5 and FIG. 5 are cross-sectional views of comparative grommets when the vehicle is assembled.

  As shown in FIGS. 1 to 3, the grommet 10 has a small diameter through which a large diameter cylindrical portion 11 assembled around the through hole 8 a of the vehicle body panel 8 and a wire harness (electric wire) 9 in which a plurality of electric wires are bundled. It has a cylindrical portion 18 and an intermediate cylindrical portion 15 having flexibility and connecting the large-diameter cylindrical portion 11 and the small-diameter cylindrical portion 18, and is integrally formed of a rubber material or an elastomer resin material. .

  As shown in FIG.1 and FIG.3, the large diameter cylinder part 11 is formed in the thick annular | circular shape, and in the part facing the area | region of the bending direction X of the small diameter cylinder part 18 at the surface 11a side, An escape portion 12 is formed in a conical concave shape. Further, as shown in FIGS. 2 and 3, a portion facing the region opposite to the region in the bending direction X of the small-diameter cylindrical portion 18 on the back surface 11 b side of the large-diameter cylindrical portion 11 is engraved in a conical concave shape. A relief part 13 is formed. That is, as shown in FIG. 4, at the positions 180 degrees apart from the front and back surfaces 11a and 11b of the large-diameter cylindrical portion 11 as the base portion, the relief portions 12 and 13 that are rolled into a conical concave shape are respectively provided. The wire harness 9 is formed so that it can be bent to the side of the relief portions 12 and 13 of the front and back surfaces 11a and 11b of the large-diameter cylindrical portion 11, respectively.

  Furthermore, as shown in FIGS. 1-4, the metal-made annular plate-shaped attachment board 14 is insert-molded in the outer peripheral part side of the large diameter cylinder part 11. As shown in FIG. A pair of tongue pieces 14a and 14a are formed at a position 180 degrees away from the mounting plate 14. A round hole 14b and an elliptical hole 14c through which a shank portion of a bolt (not shown) is inserted are formed in the center of the pair of tongue pieces 14a and 14a. The shank portion is inserted into the holes 14b and 14c of the pair of tongue pieces 14a and 14a of the mounting plate 14 with the surface 11a of the large-diameter cylindrical portion 11 applied around the through hole 8a of the vehicle body panel 8. The large-diameter cylinder portion 11 can be assembled around the through-hole 8a of the vehicle body panel 8 by bolting through a bolt and a nut (not shown) screwed into the thread portion of the shank portion.

  As shown in FIGS. 3 and 4, the intermediate cylindrical portion 15 is formed in a flexible diameter-expanding cylindrical shape, and the expansion and contraction is small in the portion corresponding to the region in the bending direction X of the small-diameter cylindrical portion 18. A bellows-like small expansion / contraction part 16 is formed, and a bellows-like large expansion / contraction part 17 having a large expansion / contraction is formed in a portion corresponding to a region opposite to the bending direction X of the small-diameter cylindrical part 18. That is, the height (length) of the bellows portion of the large stretchable portion 17 located on the opposite side to the direction in which the wire harness 9 of the flexible intermediate cylinder portion 15 is to be bent is desired to bend the wire harness 9. It is higher (longer) than the height of the bellows part of the small stretchable part 16 located in the direction part.

  As shown in FIG. 3, the small-diameter cylindrical portion 18 is formed in an elongated cylindrical shape coaxially connected to the large-diameter cylindrical portion 11 via the intermediate cylindrical portion 15, and a wire harness is provided on the inner peripheral surface side thereof. A plurality of lip portions 19 for sealing and holding 9 without gaps are integrally formed.

  FIG. 5 shows a comparative grommet 1 when the vehicle is assembled. In the grommet 1 of this comparative example, there are no relief portions on the front and back surfaces of the large-diameter cylindrical portion 2 as a base portion assembled to the vehicle body panel 8, and the large-diameter cylindrical portion 2 and the wire harness 9 penetrate therethrough. The bellows portion 4 is provided uniformly in all directions in the flexible intermediate tube portion 3 located in the middle of the small-diameter tube portion 5. 3 to 5, the symbol A indicates the room, and the symbol B indicates the outdoor.

  According to the grommet 10 of the embodiment described above, as shown in FIG. 3, when the wire harness 9 is produced, the cylindrical portions of the large diameter cylindrical portion 11, the intermediate cylindrical portion 15 and the small diameter cylindrical portion 18 of the grommet 10 from the room A side. The wire harness 9 penetrating through is produced so as to be assembled vertically to the vehicle body panel (vehicle) 8.

  As shown in FIG. 4, when assembling to the vehicle, the wire harness 9 that penetrates the large-diameter cylindrical portion 11, the intermediate cylindrical portion 15, and the small-diameter cylindrical portion 18 of the grommet 10 is attached to the vehicle body panel 8. As shown in FIG. 5, in the case of the grommet 1 of the comparative example, the bellows portion 4 is uniformly provided in all directions in the intermediate cylinder portion 3 and has the same length as shown in FIG. It is difficult to tilt the tube portion 5 diagonally. Further, if the small diameter cylindrical portion 5 of the grommet 1 is forcibly pulled so as to bring the wire harness 9 penetrating the grommet 1 closer to the vehicle body panel 8, the bellows portion 4 of the grommet 1 may be cut.

  On the other hand, in the grommet 10 of the present embodiment, when the wire harness 9 is pulled after being assembled to the vehicle, the large telescopic portion 16 of the intermediate cylinder portion 15 and the large stretchable portion 16 are aligned with the routing route of the wire harness 9. Since the expansion / contraction part 17 expands and contracts, when the wire harness 9 penetrating the grommet 10 is made parallel to the vehicle body panel 8, the small diameter cylindrical part 18 that is a water stop part of the grommet 10 is assembled to the vehicle without deformation. It is done. Moreover, even if the large expansion / contraction part 17 of the intermediate cylinder part 15 extends, the small diameter cylinder part 18 does not break.

  In addition, since the wire harness 9 is attached to the vehicle in only one direction, the wiring path of the wire harness 9 is also determined, and the front and back surfaces 11a of the large-diameter cylindrical portion 11 are matched to the wiring path of the wire harness 9. , 11b are formed with relief portions 12 and 13 each having a conical concave shape, so that the large-diameter cylindrical portion 11 as the base portion is not obstructed, and the wire harness 9 is connected to the indoor A side and the outdoor B side. It can be easily assembled to the vehicle so as to be parallel to the vehicle body panel 8 on both sides. Thereby, it becomes possible to wire the wire harness 9 easily and reliably in a very small gap (space) inside the automobile.

  Furthermore, since the interference between the wire harness 9 and the grommet 10 can be reduced, wear of the grommet 10 can be prevented. Moreover, since the escape portions 12 and 13 that are rolled into a conical concave surface are formed on the front and back surfaces 11a and 11b of the large-diameter cylindrical portion 11 of the grommet 10, the wiring route of the wire harness 9 is easily understood. It becomes easy to assemble the wire harness 9 to the vehicle.

  In addition, according to the said embodiment, although the grommet which the wire harness which bundled several electric wires penetrated was demonstrated, the electric wire which penetrates a grommet is not restricted to a wire harness, and electric wires, such as one large diameter electric wire, are penetrated. May be. Also, the grommet's large-diameter cylindrical part is bolted to the body panel, but an annular concave locking groove is formed on the outer peripheral side of the large-diameter cylindrical part, and the large-diameter cylindrical part is formed in the through hole of the body panel. You may make it assemble | attach by inserting the latching groove | channel.

8 Body panel 9 Wire harness (electric wire)
DESCRIPTION OF SYMBOLS 10 Grommet 11 Large diameter cylinder part 11a Front surface 11b Back surface 12 Beaten relief part 13 Beated relief part 15 Intermediate cylinder part 16 Small expansion part 17 Large expansion part 18 Small diameter cylinder part X Bending direction of small diameter cylinder part

Claims (3)

A large-diameter cylinder part assembled to the vehicle body panel;
A small-diameter cylindrical portion through which the electric wire penetrates,
An intermediate tube portion having flexibility and connecting the large-diameter tube portion and the small-diameter tube portion;
With
A portion facing a region in the bending direction of the small-diameter cylindrical portion on the surface side of the large-diameter cylindrical portion, and a portion facing a region opposite to the region in the bending direction of the small-diameter cylindrical portion on the back side of the large-diameter cylindrical portion A grommet characterized in that a squeezed relief portion is provided at least on the back side of the large-diameter cylindrical portion. The grommet according to claim 1,
The intermediate tube portion corresponding to the region opposite to the bending direction of the small diameter cylindrical portion is provided in the intermediate tube portion corresponding to the bending direction region of the small diameter cylindrical portion. A grommet characterized by providing a large stretchable part in the part. The grommet according to claim 1 or 2, wherein
A wire harness in which a plurality of electric wires are bundled as the electric wires,
A portion facing the bending direction region of the small diameter cylindrical portion on the surface side of the large diameter cylindrical portion and a portion facing the region opposite to the bending direction region of the small diameter cylindrical portion on the back surface side of the large diameter cylindrical portion. The grommet is characterized in that a squeezed relief portion is provided, and the wire harness is bent to each relief portion side provided on both sides of the front and back surfaces of the large-diameter cylindrical portion.

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