JP2009227000A - Grommet for back door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve working efficiency of passing a grommet inside a back door. <P>SOLUTION: The grommet 10 for the back door, locked into a body-side through-hole at one end and into a door through-hole at the other end, is integrally formed of rubber or elastomer. The grommet includes: a pair of large-diameter sleeve members 11, 12 at both longitudinal ends, which are internally fit into the body-side through-hole and the door through-hole, respectively; small-diameter sleeve members 13, 14 bending to follow the large-diameter sleeve members at both ends; and a bellows-like tubular member 15 running with crests and troughs alternately provided between the small-diameter sleeve members, with the crests on the bellows-like tubular member being larger in outside diameter than the small-diameter sleeve members, wherein the bending small-diameter sleeve member following the large-diameter sleeve member on the body side is provided with ribs 18 circumferentially projecting like crests longitudinally spaced on an outer surface serving as the circumferential side in the bending direction such that, when the grommet is passed through the back door between its inner and outer panels, the top 18a of the crest of each rib comes in point contact with the panel surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grommet for a back door of an automobile, and in particular, to improve the workability of the grommet when the grommet is pulled out to the vehicle body side through the back door.

  A door harness connected to an electrical component mounted on a back door of an automobile is bridged to the vehicle body side, and a grommet is attached to the wire harness routed on the vehicle body side for protecting the wire harness.

As this type of grommet, the present applicant has provided a grommet shown in FIGS. 6A and 6B in Japanese Patent Laid-Open No. 2001-32871 (Patent Document 1).
As shown in FIG. 6 (A), the grommet 1 is attached in advance to the vehicle body connection side of the door harness routed to the back door 2, and passes through a through hole provided in the vehicle body side end surface of the panel 2a of the back door 2. It is routed to a through hole provided in the end face of the vehicle body 3.
The grommet 1 is formed of rubber or elastomer and has large diameter portions 1a and 1b that are locked to the through holes at both ends as shown in FIG. 6B, and is bent with the large diameter portions 1a and 1b on both sides. It is made into the shape which followed the bellows cylinder part 1e via the cylinder parts 1c and 1d. That is, the large-diameter portions 1a and 1b on both sides with respect to the axial direction of the bellows tube portion 1e are bent in different directions via the bent tube portions 1c and 1d.
The grommet 1 of Patent Document 1 is provided with ribs 1f projecting on both sides in the length direction of the bellows tube portion 1e, and is provided to restrict the deformation direction when the bellows tube portion 1e is folded in two when the door is closed. Yes.

As shown in FIGS. 7A and 7B, the grommet 1 routed from the door 2 to the vehicle body 3 is passed through the opening 2b on the inner surface side of the panel 2a of the door 2 to the through hole 2c on the vehicle body side end surface. ing. The through space S of the grommet 1 in the frame 2a is very narrow, and the outer panel 2d is inclined. Therefore, when pulling in the direction of the arrow from the through hole 2c toward the vehicle body 3 side of the grommet 1, the outer peripheral surface of the bent cylindrical portion 1c between the large diameter portion 1a and the bellows cylindrical portion 1e contacts the inner surface of the outer panel 2d. To do. Since the grommet 1 is made of rubber or elastomer, the slipperiness is poor, and when it comes into contact, there is a problem that the grommet 1 is caught and the workability of the grommet 1 is very poor.

  None of the grommets conventionally provided including the grommets of Patent Document 1 are provided with a measure for reducing the contact friction on the outer peripheral surface of the bent cylindrical portion. Therefore, it is desired to improve the threading workability of the grommet described above.

JP 2001-132871 A

  The present invention is intended to solve the above problem, and even if the grommet that spans between the back door and the vehicle body comes into contact with the inner surface of the back door when passing through the back door, the contact friction can be reduced. The goal is to achieve a smooth grommet threading operation.

In order to solve the above-mentioned problems, the present invention provides an exterior covering a wire harness routed to a back door of an automobile on the side of the vehicle body, penetrates a space between panels of the back door, and passes through a through hole on the door side. A back door grommet that is pulled out to the side, the front end is locked to the through hole on the vehicle body side, and the other end is locked to the through hole on the door side,
A pair of large-diameter cylinder parts, which are integrally formed of rubber or elastomer, and are fitted into the through-holes on the vehicle body side and the through-holes on the door side, are provided at both ends in the length direction. The small-diameter cylindrical portion bent at the portion is continuous, and the bellows-cylindrical tube portion in which peaks and valleys are alternately provided between the small-diameter cylindrical portions is continuously provided. It is larger than the outer diameter of the small diameter cylinder part,
The bent small-diameter cylindrical portion that is continuous with the large-diameter cylindrical portion on the vehicle body side is provided with ribs that protrude in a mountain shape in the circumferential direction at intervals in the length direction on the outer surface that is the outer peripheral side in the bending direction. A grommet for a back door is provided, wherein the peak-shaped apex portion of the rib is brought into point contact with the panel when passing between the inner and outer panels of the back door.

As described above, the grommet of the present invention has a chevron-shaped rib in the circumferential direction at intervals in the longitudinal direction on the outer circumferential side of the bent small-diameter cylindrical portion that is continuous with the large-diameter cylindrical portion on the vehicle body side. Provided. In other words, the ribs are not continuous in the length direction along the bending direction of the bent portion, and are provided in the circumferential direction on the outer peripheral side with a gap in the length direction.
When the ribs are continued in the length direction along the bending direction, the tips of the ribs R are in line contact with the inner surface of the door as shown in FIG. When the rib R in the length direction is provided, the contact friction is reduced as compared with the case where the outer peripheral surface of the bent portion 1c of the grommet 1 directly contacts the inner surface of the inclined panel 2d. If the apex portion is in contact with the inner surface of the panel, point contact will occur and contact friction can be greatly reduced, allowing the grommet to pass smoothly. .

The bent small-diameter cylindrical portion continuous with the large-diameter cylindrical portion on the vehicle body side is bent at an angle of less than 90 degrees and 30 degrees or more with respect to the axial direction of the large-diameter cylindrical portion. The ribs are provided with an interval of 30 mm in the length direction.
The protruding height of the rib is 0.5 mm to 2 mm, and the height of the rib is equal to or less than the height of the peak portion of the bellows portion.

  The protruding height of the rib is set lower than the height of the peak portion of the bellows tube portion because the insertion space for the grommet in the back door is a space so as not to deform the bellows tube portion. When the rib is projected through the space, if the rib protrudes from the peak portion of the bellows tube portion, the rib comes into contact with the inner surface of the panel during the threading operation, and the threading workability is deteriorated.

Moreover, it is preferable that each rib protruded into the mountain shape has an inclined surface on the side of the large-diameter cylindrical portion that is the insertion side.
In this way, when the rib insertion side is inclined, the rib can be brought into contact with the inner surface of the panel smoothly, and the rib can be caught on the inner surface of the panel so as not to become insertion resistance.

  As described above, the grommet according to the present invention protrudes in the shape of a mountain in the circumferential direction with an interval in the length direction on the outer peripheral side of the bent small-diameter cylindrical portion that contacts the inner surface of the inclined outer panel of the back door. When the back door is made to penetrate between the inner and outer panels, the rib-shaped apex of the rib is point-contacted with the inner surface of the panel before the inner surface of the inclined outer panel of the small-diameter cylindrical portion comes into contact. Therefore, the workability of the grommet between the inner and outer panels of the back door can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The wire harness grommet 10 shown in FIG. 1 of the present invention is applied to the vehicle body 3 of the wire harness W / H routed to the back door 2 of the automobile in the same manner as in FIGS. 6 (A) and 7 (A). Exterior on the bridge side. The grommet 10 passes through the insertion space S between the inner and outer panels 20, 21 of the back door 2, is pulled out to the vehicle body 3 side through a through hole 22 provided in an end surface facing the vehicle body 3, and the tip is passed through the vehicle body side. The other end is locked to the through hole 22 while being locked to the hole.

  The grommet 10 is integrally formed of an elastic material made of rubber or elastomer. As shown in FIG. 1, the grommet 10 includes a pair of large-diameter cylindrical portions 11 and 12 that are fitted into the inner peripheral surfaces of the through hole 22 on the door side and the through hole of the vehicle body 3 at both ends in the length direction. The bellows cylinder part 15 which the small diameter cylinder parts 13 and 14 bent to the large diameter cylinder parts 11 and 12 of these both ends continues, and the crest part 15a and the trough part 15b were alternately provided between the small diameter cylinder parts 13 and 14. Are provided continuously.

The outer diameter of the peak portion 15a of the bellows tube portion 15 is larger than the outer diameters of the small diameter tube portions 13 and 14.
The bent small-diameter cylindrical portion 13 continuous to the large-diameter cylindrical portion 11 on the vehicle body 3 side is bent at an angle of less than 90 degrees and 30 degrees or more with respect to the axial direction of the large-diameter cylindrical portion 11.

  The bent small-diameter cylindrical portion 13 that is continuous with the large-diameter cylindrical portion 11 has a mountain shape in the circumferential direction X that is perpendicular to the length direction with an interval in the length direction Y on the outer surface that is the outer peripheral side in the bending direction. The rib 18 which protrudes in is provided. That is, these ribs 18 having a mountain shape are inclined toward the center from both ends in the circumferential direction in the semicircular portion on the upper surface side in the figure, and the most projecting apex portion 18a is positioned at the center on the upper surface side. ing.

The rib 18 is provided at a bent portion between the continuous end with the large-diameter cylindrical portion 11 and the connecting end with the bellows cylindrical portion 15 with an interval of 10 mm to 30 mm in the length direction Y. In the present embodiment, three ribs 18-1, 18-2, 18-3 are provided at an interval of 11 mm.
The height of the most projecting apex portion 18a of these ribs 18 is 0.5 mm to 2 mm, and is 1 mm in this embodiment. The height of the apex portion 18a is equal to or less than the height of the peak portion 15a of the bellows cylinder portion 15, that is, the diameter of the small diameter cylinder portion 13 including the apex portion of the rib 18 is equal to or less than the diameter of the peak portion 15a.

  Further, as shown in FIGS. 1 and 2, each rib 18 has a side surface on the large-diameter cylindrical portion 11 side as an insertion side as an inclined surface 18 b.

As shown in FIG. 3, a tape winding for fixing the wire harness W / H from an inner peripheral portion continuous with the small diameter cylindrical portion 13 is provided on the large diameter cylindrical portion 11 on the attachment side of the grommet 10 to the vehicle body 3. A tongue lip 16 is protruded, a seal lip 11b is provided at the tip of the enlarged diameter portion 11a of the large diameter cylindrical portion 11, and a resin inner 17 is fitted in the enlarged diameter portion 13a. A locking step portion 17 b is provided at the tip of the folded portion 17 a of the resin inner 17, and the locking step portion 17 b is locked to the inner peripheral edge of the through hole 30 on the vehicle body 3 side and locked to the through hole 30. .
The large-diameter cylindrical portion 12 fitted in the through hole 22 of the back door 2 is provided with a locking groove 12 a on the outer peripheral surface thereof and is configured to be locked to the inner periphery of the through hole 22.

  The wire harness W / H routed in the back door 2 is passed through the grommet 10 having the above-described shape, and the wire harness W / H protruding from the large-diameter cylindrical portion 11 of the grommet 10 is wound around the tape winding tongue piece 16 with the tape 31. The wire harness W / H and the grommet 10 are fixed.

  The wire harness W / H to which the grommet 10 is attached penetrates the insertion space S between the inner and outer panels 20 and 21 of the back door 2 and opposes the vehicle body 3 as in the conventional example shown in FIG. After pulling out toward the vehicle body 3 through the hole 22 and locking the large-diameter cylindrical portion 13 in the through-hole 30 on the vehicle-body 3 side, the large-diameter cylindrical portion 11 is fitted into the through-hole 22 on the back door 2 side, and the resin inner 17 is locked.

As shown in FIGS. 4A and 4B, the insertion space S sandwiched between the inner panel 20 and the outer panel 21 of the back door 2 is inclined toward the end surface 26 in which the outer panel 21 is provided with a through hole 22. is doing.
Therefore, as described in FIG. 7B of the prior art, when pulling out the grommet 10 from the through hole 22 in the direction of the arrow, the outer peripheral side (in the drawing, The upper surface side is in contact with the inner surface of the outer panel 21.

In the grommet 10 of the present invention, as described above, the ribs 18 protrude from the outer peripheral surface of the small-diameter cylindrical portion 13, so that the most protruding apex portion 18a of each rib 18 is formed as shown in FIG. It is possible to prevent the outer peripheral surface of the small diameter cylindrical portion 13 from coming into direct contact with the inner surface of the outer panel 21. In addition, the ribs 18 are not provided extending in the length direction X direction of the small-diameter cylindrical portion 13 but are provided at intervals in the orthogonal circumferential direction Y. Therefore, the apex portion 18 a of the rib 18 is pulled by the grommet 10. Accordingly, only point contact is made with the inner surface of the outer panel 21.
In addition, since each rib 18 has an inclined surface 18b on the side surface on the large-diameter cylindrical portion 11 side that is the insertion side, the rib 18 contacts smoothly without generating a catch when contacting the inner surface of the outer panel 21. Can be made.
As a result, the contact friction between the grommet 10 and the outer frame 21 is greatly reduced, and it is possible to prevent the grommet 10 from being caught by this contact and deteriorating the workability of the grommet 10.

The present invention is not limited to the above-described embodiment, and the rib 18 has a shape in which the inclined surface 18b on the insertion side is provided in a triangular shape in a plan view as shown in FIG. May be. Further, as shown in FIG. 5 (B), the chevron provided in the circumferential direction is bent in the insertion direction, or as shown in FIG. 5 (C), the inclined surface 18b is formed in the apex part 18a of the chevron. May be provided. Even in the case of these shapes, the rib 18 can be used as a mark in the insertion direction.
5A, 5 </ b> B, and 5 </ b> C, the apex portion 18 a is projected most so as to make point contact with the inner surface of the inclined outer panel of the back door.

It is a perspective view of the grommet of an embodiment. The rib of a grommet is shown, (A) is the figure seen from the circumferential direction, (B) is the BB sectional drawing of (A). It is sectional drawing by the vehicle body latching side of a grommet. The state which has inserted the grommet in the insertion space of a back door is shown, (A) is a perspective view, (B) is sectional drawing. (A)-(C) are top views which show the modification of a rib. A prior art example is shown, (A) is a perspective view of the state which attached the grommet between the back door and the vehicle body, (B) is a top view of the grommet. (A) (B) is drawing which shows the problem at the time of inserting a grommet in a back door. It is drawing which shows the problem at the time of providing a rib in a length direction.

Explanation of symbols

2 Back door 3 Car body 10 Grommet 11, 12 Large diameter tube portion 13, 14 Bent small diameter tube portion 15 Bellows tube portion 18 Rib 18a Vertex portion 18b Inclined surface 21 Back door outer panel 22 Back door through hole 30 On the vehicle body side Through hole W / H Wire harness

Claims (3)

The wire harness routed to the back door of the automobile is sheathed on the side of the vehicle that extends to the vehicle body, penetrates the space between the panels of the back door, pulls out to the vehicle side through the through hole on the door side, and the tip penetrates to the vehicle side A grommet for a back door that locks in the hole and locks the other end in the through hole on the door side,
A pair of large-diameter cylinder parts, which are integrally formed of rubber or elastomer, and are fitted into the through-holes on the vehicle body side and the through-holes on the door side, are provided at both ends in the length direction. The small-diameter cylindrical portion bent at the portion is continuous, and the bellows-cylindrical tube portion in which peaks and valleys are alternately provided between the small-diameter cylindrical portions is continuously provided. It is larger than the outer diameter of the small diameter cylinder part,
The bent small-diameter cylindrical portion that is continuous with the large-diameter cylindrical portion on the vehicle body side is provided with ribs that protrude in a mountain shape in the circumferential direction at intervals in the length direction on the outer surface that is the outer peripheral side in the bending direction. The back door grommet is characterized in that when the back door is penetrated between the inner and outer panels, the peak-shaped apex of the rib is brought into point contact with the panel.   The bent small-diameter cylindrical portion continuous with the large-diameter cylindrical portion on the vehicle body side is bent at an angle of less than 90 degrees and 30 degrees or more with respect to the axial direction of the large-diameter cylindrical portion, and the small-diameter cylindrical portion has a diameter of 10 mm to 30 mm. The rib is provided with a gap in the length direction, and the protruding height of the rib is 0.5 mm to 2 mm, and the height of the rib is equal to or less than the height of the peak portion of the bellows portion. Grommet for back door as described in.   The backdoor grommet according to claim 1 or 2, wherein the chevron-shaped rib in each circumferential direction has an inclined surface on a side surface on the large-diameter cylindrical portion side serving as an insertion side.

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