JP2006131154A - Grommet, and wire harness arrangement structure using grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grommet to protect a wire harness of an automobile which can be mounted even in a narrow space and follow sufficient expansion/contraction and bend. <P>SOLUTION: The grommet 50 constitutes a diaphragm part 58 consisting of a large diameter cylindrical part, a thin-walled connection cylindrical part and a small diameter cylindrical part. In the diaphragm part 58, the thin-walled connection cylindrical part is in a returned state, and inserted in the large diameter cylindrical part. When the tension is applied, the thin-walled connection cylindrical part is drawn outside from the large diameter cylindrical part. When the bend is applied, the thin-walled connection part can follow the bend. The grommet 50 is housed over a tip of a wire harness 40 which is arranged on a door and drawn to the body side, a hard tube to allow the wire harness to pass through is connected to the grommet, and the hard tube is slidably stored in a guide member in the door. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a grommet that is externally mounted on a wire harness that is routed in an automobile and is inserted and locked into a through-hole of a panel or the like, and a wire harness routing structure that uses the grommet.

  In the wire harness that spans between the body and door of an automobile, a grommet made of rubber or elastomer is externally attached to the part through which the through hole formed in the body and the door is inserted, and the grommet is attached to the periphery of the through hole. It is fitted and fixed to protect the wire harness, waterproof and dustproof.

As shown in FIG. 8, the wire harness routed between the vehicle body and the side door is connected to the body 3 side through the through-hole 1b drilled in the vehicle body side end surface of the inner panel 1a of the door 1. Harness) W / H is covered with grommet G, and is connected to a wire harness routed in the body 3 through a through hole 3a formed in the body 3. Conventionally, the wire harness is routed above or below the hinge H that connects the door and the vehicle body, so the through-hole 1b on the door side is formed outside the weather strip 2 on the outdoor side. Therefore, the wire harness is provided with a grommet, and the grommet is fitted into the through hole 1b to be waterproof, thereby preventing water from entering the room when the door is closed.
As described above, since the wire harness is routed above or below the hinge between the vehicle body and the door, only the wire harness is bent and twisted when the door is opened and closed, and the wire harness does not expand and contract. The grommet G has a shape as long as it can follow the bending and twisting of the wire harness when the door is opened and closed, and the grommet is not required to have a telescopic function.

  As this type of grommet, a grommet 4 shown in FIG. 9 is conventionally provided in Japanese Patent Laid-Open No. 2000-217229 (Patent Document 1). The grommet 4 is provided with large-diameter cylindrical portions 4b and 4c attached to the through holes of the door and the body at both ends of the bellows-shaped cylindrical portion 4a. 4e is provided. The large-diameter cylindrical portions 4b and 4c are thick at the portions where the vehicle body locking grooves 4d and 4e are provided, and the large-diameter portions 4f and 4g are thin in consideration of workability for insertion into the through holes. When bending or twisting is applied, the grommet itself can follow to some extent.

However, in the case of the wire harness wiring structure shown in FIG. 8, it is very difficult to penetrate the wire harness W / H through the through hole 1b on the door side. Many proposals have been made to route to the side.
For example, the present applicant has previously provided a wire harness wiring structure shown in FIG. 10 in Japanese Patent Laid-Open No. 10-934 (Patent Document 2). In this wire harness routing structure, since the wire harness is pulled out from the interior surface side of the inner panel 1a of the door 1 and routed to the vehicle body side, it is not necessary to pass through a through-hole and the routing work is facilitated. However, since the position of the wiring harness is shifted to the indoor side of the hinge coupling position between the body and the door, it is necessary to expand and contract the wiring harness when the door is opened and closed.
Therefore, in patent document 2, while providing the substantially triangular space 1c in the indoor side surface of the inner panel 1a of the door 1, the wire harness W / H is provided with an extra length portion that can follow the opening and closing of the door. Is housed in the space 1c and pulled out from the outlet of the space 1c to the body side.
With the above configuration, when the door is opened, the wire harness is pulled out of the space 1c. When the door is closed, the extra length of the wire harness is accommodated in the space 1c, and the wire harness is interlocked with the opening / closing operation of the door. Can be followed.

As described above, when it is necessary to extend and retract the wire harness when the door is opened and closed by shifting the position where the door and body are bridged from the hinge position, in the grommet 4 shown in FIG. It is impossible to follow the expansion and contraction operation of the wire harness only by having the necessary expansion and contraction function. In order to cope with expansion and contraction using only the bellows-like tube portion, it is necessary to increase the length of the bellows-like tube portion. In this case, there is a problem that it cannot be accommodated in the narrow gap when the door is closed. Automobiles have structural limitations on space, and in particular, the space between the door and the vehicle body is often narrow. Therefore, there is a demand for a grommet that can be installed in a narrow space and that can sufficiently accommodate bending and expansion / contraction.
When wiring the wire harness from the weather strip to the outdoor side, a waterproof function is required for the wire harness penetrating portion on the door side, but the wiring harness is routed from the weather strip to the vehicle body side from the indoor side. In this case, since the waterproof function is performed by the weather strip when the door is closed, the waterproof function is not so required for the grommet on the door side.
Therefore, unlike the grommet 4 shown in FIG. 9, it is not necessary to insert and seal it in the through hole on the door side, and it is only necessary to attach the grommet in the sealed state to the through hole on the vehicle body side. Then, only the grommet becomes long, and the above-mentioned problem on the space cannot be solved.

Furthermore, in the case of the configuration shown in FIG. 10, the wire harness drawn from the grommet is weak in rigidity because it only converges the wire group and winds with tape, and it is reliably pulled into the space 1c when the door is closed. There is a fear that you can not.
JP 2000-217229 A Japanese Patent Laid-Open No. 10-934

The present invention has been made in view of the above problems, and firstly, in a grommet used by being mounted on an automobile wire harness, a grommet that can be attached to a narrow gap and can flexibly cope with expansion / contraction / bending of the wire harness. The issue is to provide.
Secondly, when a wire harness routed from an opening / closing member such as a door to the vehicle body is routed without passing through, the wire harness can reliably follow the opening / closing operation of the opening / closing member and follow the opening / closing operation of the opening / closing member. Thus, it is an object to prevent damage to the wire harness that expands and contracts and to suppress the generation of abnormal noise.

In order to solve the above-mentioned problems, the present invention is firstly a grommet that is integrally formed from rubber or elastomer, and is externally attached to a wire harness routed in an automobile and inserted and locked into a through-hole of a panel,
From the front end to the other end on the panel locking side, the maximum outer diameter cylindrical portion provided with a vehicle body locking portion on the outer peripheral surface, a large diameter cylindrical portion that is more compact than the maximum outer diameter cylindrical portion, a thin connecting cylindrical portion, and a small diameter cylindrical portion And a pressing cylinder part that is enlarged from the small-diameter cylindrical part and thickened continuously,
The large-diameter cylindrical part, the thin-walled cylindrical part, and the small-diameter cylindrical part constitute a diaphragm part, and the diaphragm part is inserted into the large-diameter cylindrical part with the thin-walled cylindrical part turned up and inserted. When the tensile force of the wire harness is applied, the thin connecting tube portion is pulled out from the large diameter tube portion, and when the wire harness is bent, the thin connecting tube portion extends and follows the bending. The grommet which is made up is provided.

In the grommet having the above-described configuration, the diaphragm portion is provided, and in the original form, the thin connecting tube portion is folded and inserted into the large-diameter tube portion, so that the grommet is shortened while the grommet is pulled in the axial direction. At this time, the thin connecting tube portion is pulled out from the large diameter tube portion, and the grommet itself can be extended by the length of the thin connecting tube portion. That is, it has an expansion / contraction function that has not been imparted to conventional grommets, and when the wire harness is expanded / contracted, the grommets can smoothly follow the expansion / contraction operation.
On the other hand, when a force in the compression direction is applied from the extended state, the thin-walled connecting cylinder portion is pressed and contracted more than the original shape, and can be easily accommodated in the narrow gap.
And the thin connection cylinder part of the said diaphragm part can bend and twist not only expansion-contraction, but can follow the bending of the left-right direction of a wire harness. Therefore, the thin-walled connecting portion only needs to be thin on at least the left and right sides in the circumferential direction, and the upper and lower sides are not necessarily thin.

  Further, the grommet is provided with a maximum outer diameter cylindrical portion which is inserted into the through hole at one end and provided with a vehicle body locking groove to be locked at the periphery thereof, but is inserted into the through hole at the other end side. In addition, since the pressing cylinder portion that is pressed to the periphery of the through hole is provided, the length of the grommet itself can be greatly reduced as compared with the grommet shown in FIG. 8, and it is particularly necessary to accommodate in a narrow space. It is suitable when there is. And the operation | work which latches the said pressing cylinder part to a through-hole can be made unnecessary, and the wiring workability | operativity of the wire harness which coat | covers this grommet can be simplified.

Secondly, the grommet is externally fitted to a wire harness, a hard tube is externally fitted to the wire harness drawn from the pressing cylinder portion of the grommet, and the distal end of the hard tube is connected to the pressing cylinder. And locking the other end of the hard tube to the wire harness,
The wire harness to which the hard tube and the grommet are attached is bridged between an automobile body and an opening / closing member hinged to the body, and the hard tube is slidably accommodated in a guide member provided on the opening / closing member. In addition, while pulling out from the opening provided in the guide member to the body side, the pressing cylinder portion of the grommet is pressed against the peripheral edge of the opening or the protruding member from the guide member when the opening / closing member is closed. A wiring structure for a wire harness that is configured to be stopped is provided.

In the wire harness routing structure of the second invention, the grommet of the first invention is externally mounted on a wire harness that spans between a body and an opening / closing member such as a door, and the grommet is bent and twisted and expanded and contracted. By providing, it is possible to smoothly follow the bending and twisting and expansion / contraction operation of the wire harness during the opening / closing operation of the opening / closing member.
Moreover, the bending and twisting operation of the wire harness can be followed by the bending and twisting function of the grommet, and the expansion and contraction operation of the wire harness can be followed by the expansion and contraction function of the grommet. Therefore, when the wire harness pulled out from the pressing tube portion of the grommet should slide smoothly without causing slack or bending torsion when sliding due to the expansion / contraction operation, the rigid tube is attached to the grommet. It is attached continuously to the pressing cylinder.

Specifically, as described above, the hard tube is slidably accommodated in a guide member provided in an opening / closing member such as a door, and can be pulled out from the opening provided in the guide member to the body side, When the opening / closing member is opened, the thin connecting tube portion is pulled out by the diaphragm portion of the grommet, and the grommet itself can be extended to follow the wire harness. On the other hand, at the time of the closing operation, the thin-walled connecting cylinder part returns to its original shape and is bent, so that the grommet itself contracts and is comfortably accommodated in a narrow space between the body and the opening / closing member, and the pressing cylinder part is a guide member It is pressed against the peripheral edge of the opening to restrict movement and also functions to close the opening.
And, at the time of following operation of the wire harness at the time of opening and closing, since the wire harness is passed through the straight hard tube and fixed to the hard tube, the wire harness is straightened without causing slack with the hard tube. The wire harness can be made to follow the opening / closing operation of the opening / closing member with certainty. Moreover, since the wire harness is protected by the hard tube during the follow-up operation of the wire harness, it can be prevented that the wire harness droops between the body and the opening / closing member or is inadvertently damaged.

The above-described wiring structure of the wire harness can be most preferably applied to a wiring structure of a wire harness that is bridged between a side door to which a large number of electrical components are attached and the vehicle body.
That is, the opening / closing member is a side door, and a protector serving as the guide member is attached to the inner side surface of the inner panel of the side door, and the wire harness is provided with an extra length portion and the protector is provided for absorbing extra length. Set up a space,
The hard tube is slidably drawn out from the opening of the protector, is passed over the interior side of the weather strip from the indoor side to the body side, and when the side door is closed, the pressing tube portion of the grommet is positioned at the periphery of the opening of the protector. The structure is configured to restrict the pulling of the wire harness toward the side door by being pressed.

As described above, when the present invention is applied to the structure in which the door harness routed to the side door is routed on the vehicle body side, the door harness is routed on the indoor side rather than the weather strip. The operation of inserting the through hole provided in the end face of the wire harness becomes unnecessary, and the wiring workability of the wire harness can be greatly improved.
In addition, the grommet fixed to the tip of the hard tube is not allowed to penetrate into the opening of the protector, and the grommet is stopped at the opening position when the surplus length of the wire harness is pulled into the surplus length absorption space. The amount of pull-in can be regulated. Moreover, in order to absorb the movement of the opening / closing member in the rotational direction, a gap must be provided between the hard tube and the guide portion. However, the pressing tube portion of the grommet is brought into contact with and pressed against the opening periphery of the protector. Thus, the hard tube is fixed together with the grommet, and it is possible to prevent the hard tube from resonating with the body vibration and generating abnormal noise.

The tip of the hard tube and the grommet are fixed by fitting a ring on the tip of the hard tube or by projecting a flange, and inserting the tip of the hard tube into the grommet. It is preferable to fix by pushing the ring or flange into the groove. In addition, the other end of the hard tube and the wire harness are preferably fixed by projecting a tape-wrapped tongue piece on the other end of the hard tube and fixing the tongue piece, the wire harness, and the tape.
However, the fixing of the hard tube, the grommet, and the wire harness is not limited to the above configuration, and other appropriate means may be adopted.

  As described above, according to the present invention, in the grommet that is sheathed on the wire harness and at least one end is inserted and locked into the through hole of the panel, the diaphragm portion of the grommet can reliably cope with expansion and contraction and bending. Can be installed in narrow gaps.

In particular, when the grommet is packaged between a side door and a vehicle body and on a wire harness that is routed indoors from the weather strip, it can follow both expansion and contraction and bending torsion of the wire harness.
In addition, a hard tube is connected to the grommet, and a wire harness is inserted through the hard tube so as to enter and exit the opening / closing member, so that the excess length of the guide portion on the opening / closing member side can be accommodated without causing the wire harness to loosen. The extra length of the wire harness can be securely and smoothly accommodated and pulled out in the work space. And the resistance at the time of operation | movement of this wire harness can also be reduced, and noise generation can also be reduced.
As described above, the grommet of the present invention is used in the wiring structure of the wire harness, can smoothly follow the expansion and contraction and bending of the wire harness, has no sense of incongruity such as operability and abnormal noise, and is resistant to water, durability, and assembly. It is possible to realize a wire harness wiring structure that is also excellent in attachment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
In the embodiment, a wire harness (door harness) 40 routed to the side door 10 (hereinafter abbreviated as the door 10) is routed to the body 20 of the vehicle body.
1A and 1B show a state in which the door 10 is opened, and FIGS. 2A and 2B show a state in which the door 10 is closed.

  In the door 10, an outer panel 12 and an inner panel 11 are joined, and a protector 70 made of a resin molded product is fixed to a position on the interior side of the inner panel 11 and on the body side, and a door trim (not shown) is provided. It is attached. The door 10 has a body-side end surface of the inner panel 11 coupled to the body 20 by a hinge 21, and the door 10 is rotatably connected with the hinge 21 as a fulcrum.

The wire harness 40 is routed inside the inner panel 11, and a connector (not shown) connected to the terminal is connected to required electrical components. After passing through the inside of the protector 70, the wire harness 40 is pulled out from the interior side of the weather strip 13 on the body side end surface of the inner panel 11, and a grommet 50 is externally fitted to the tip, and the grommet 50 is attached to the body 20 The hole 22 is inserted and locked. A hard tube 60 made of a resin molded product is continuously covered with the grommet 50 over the wire harness 40, and the hard tube 60 is accommodated in a through hole 77a of the protector 70 so as to be freely accessible.
As will be described later, the wire harness 40 is provided with a surplus length portion 40a, and the surplus length portion 40a is housed in a surplus length absorbing space 72 provided in the protector 70 so as to be freely drawn out. While the extra length portion of 40 is pulled out from the protector 70, it is returned to the extra length absorption space 72 when the door is closed.

The grommet 50 has the shape shown in FIG. 3, FIG. 3 (A) is a side view seen from the door side, (B) is a cross-sectional view of the original length of the free length, and (C) is a cross-section with the door opened. FIG.
The grommet 50 is integrally formed from an elastic material such as rubber or elastomer, and has a cylindrical shape that allows the wire harness to pass therethrough.
A maximum outer cylindrical portion 51 having an oval shape is provided at one end in the axial direction, and a vehicle body locking groove 52 is provided in the outer peripheral surface thereof. In the vehicle body locking groove 52, the side wall 52c at the distal end on the insertion side of the both side walls 52b and 52c of the groove bottom surface 52a is an inclined wall, and the insertion force to the mounting hole 22 of the body 20 is reduced.

  The reason why the maximum outer cylindrical portion 51 is oval is to insert a substantially rectangular parallelepiped connector (not shown) attached to the most distal end portion of the wire harness 40 into the attachment hole 22 of the body. In the present embodiment, the large-diameter cylindrical portion 53 having a perfect circular shape is continuous with the elliptical maximum outer cylindrical portion 51 at an eccentric position. This is because if the large-diameter cylindrical portion 53 is continued at a concentric position, the mounting hole 22 needs to be shifted upward, but the position of the mounting hole 22 that can be drilled on the body 20 side is restricted. The

The large-diameter cylindrical portion 53 is connected to the small-diameter cylindrical portion 55 via a thin connecting cylindrical portion 54, and a pressing cylindrical portion 56 is provided at the tip of the small-diameter cylindrical portion 55. The large-diameter cylindrical portion 53, the thin-walled cylindrical portion 54, and the small-diameter cylindrical portion 55 form a diaphragm portion 58 that can change the length in the axial direction.
The thin-walled connecting tube portion 54 is shaped in advance so as to wrap around the inside of the large-diameter tube portion 53 in a bent state, and is connected to the small-diameter tube portion 55. When the small-diameter tube portion 55 is pulled, the thin-wall connecting tube portion 54 When it is pulled out and the tensile force applied to the small-diameter cylindrical portion 55 is released, it returns to its original shape and wraps around the large-diameter cylindrical portion 53.
That is, the grommet 50 can be expanded and contracted by a certain dimension in the axial direction by the diaphragm 58, shortened when the door is closed, and fits in a narrow gap between the door 10 and the body 20, and when the door 10 is opened, the wire harness 40 is pulled. It stretches according to force and absorbs movement in the bending direction.

  A hard tube locking groove 57 is provided inside the pressing tube portion 56, and a flange 62 of the hard tube 60 is fitted into the hard tube locking groove 57. The pressing cylinder portion 56 has an outer diameter that cannot be passed through the through hole 77a of the protector 70, and is pressed against the closed wall 77 on the periphery of the through hole 77a when the door is closed to be fixed. As a result, even if there is play between the hard tube 60 and the protector 70, resonance is caused by body vibration or the like so that no abnormal noise is generated.

As shown in FIGS. 1 (A) and 2 (A), the protector 70 has a shallow, substantially triangular shape, and a guide peripheral wall 75 projects from each side of the bottom wall portion 73, and an upper side peripheral wall 75a is linear. In addition, the side peripheral wall 75b on the front end side that is disposed with the upper peripheral wall 75a and the linear slide space 79 being opened is gently curved downward. The other side peripheral wall 75c has a shape that is gently curved so as to be close to the side peripheral wall 75b.
An entrance opening 71 is provided at the tip of the slide space 79, and a lower end opening between the pair of side peripheral walls 75 b and 75 c is used as a drawer opening 76 to the inside of the door. The large volume portion applied to the above is used as the extra length absorption space 72. The extra length absorbing space 72 is a gently curved space having a large radius toward the corners of the upper side peripheral wall 75a and the side peripheral wall 75c.
By making the guide portion formed by the protector 70 into the shape described above, the wire harness 40 is guided linearly in the sliding space 79, while the wire harness 40 is prevented from being bent sharply in the surplus length absorbing space 72, and the stress is reduced. We avoid concentrating on specific places.

A closing wall 77 is provided between the upper side peripheral wall 75 a and the side side peripheral wall 75 b on the inner side of the entrance opening 71 at the tip of the slide space 79, and a through hole 77 a is provided in the closing wall 77.
In addition, a pair of flange portions 76A are projected from the outer surface on the front end side where the opening 71 is provided, and a flange portion 76B is projected from the outer surface of the corner portion, and these flange portions 76A and 76B are formed on the inner panel 11. Screwed.

  As shown in FIG. 4, the hard tube 60 is formed of a hard resin that is not easily bent, and a flange 62 is provided at one end of a cylindrical main body portion 61, and is fitted into the grommet 50. The flange 62 may be provided by integral molding, or a separate ring may be fitted and fixed instead of the flange 62. A tape winding tongue piece 63 projects from the other end, and the tape T is wound around and fixed to the tape winding tongue piece 63 and the wire harness 40. In addition, although the hard tube 60 has a cylindrical shape, positioning in the rotational direction can also be performed by using a square tube.

  The wire harness 40 is passed through the hard tube 60 and fixed to the grommet 50 in a state of being fixed with the tape T, and the distal end of the hard tube 60 is fitted and fixed to the pressing cylinder portion 56. In this state, the hard tube 60 is slidably accommodated in the slide space 79 of the protector 70. A required dimension of the wire harness 40 extending from the portion fixed by the hard tube 60 and the tape T is defined as an extra length portion 40a, and the extra length portion 40a is accommodated in an extra length absorbing space 72 of the protector 70, As shown in FIG. 5, the end portion of the long portion 40 a is locked by a band-type clamp 82 in a locking hole 78 provided at the position of the drawer opening 76 of the protector 70. At that time, a gap C is formed between the locking step portion 82e of the clamp 82 and the locking hole 78 to lock the wire harness 40 so that the wire harness 40 can be bent.

Further, as shown in FIG. 6, a protective material 41 is wound and fixed to the extra length portion 40 a of the wire harness drawn from the hard tube 60 with a tape T. The protective material 41 is a resin molded product having smoothness, and has a shape in which a stepped convex portion 42 is provided at the center of a rectangular substrate 41a and ribs 44 are provided at both ends.
The protective material 41 slidably abuts the stepped protrusion 42 on the inner surface of the upper peripheral wall 75a of the protector 70 so that the wire harness 40 does not directly contact the inner surface of the protector and protects the wire harness 40 from wear. The movement of the wire harness 40 can be performed smoothly.

Next, the operation of the wire harness 40 that accompanies the opening and closing of the door in the wiring harness wiring structure having the above-described configuration will be described.
When the door 10 shown in FIG. 2 is closed and the door 10 shown in FIG. 1 is opened, the thin connecting tube portion 54 of the grommet 50 is bent along with the rotation of the door 10 so that the door 10 is routed. The bent wire harness 40 is followed.
Moreover, since the rotation fulcrum of the door 10 and the wiring position of the wire harness 40 are shifted when the door 10 is opened, the wire harness 40 needs to be extended to follow. As shown in FIG. 2 with the door closed, the surplus length portion 40a of the wire harness 40 is accommodated in the surplus length accommodating space 72 by being curved along the corner side. From this state, following the opening operation of the door 10, the hard tube 60 moves to the left in the figure in the slide space 79, and the hard tube 60 moves to the body 20 side through the through-hole 77 a and the entrance / exit opening 71. The extra length portion 40a in the extra length absorption space 72 is drawn close to the side peripheral wall 75b and drawn from the curved state to the inclined state, and the state shown in FIG. It becomes.

When the door 10 is closed from the door open state shown in FIG. 1, the opening operation is reversed and the wire harness 40 is pushed into the protector 70 together with the hard tube 60, and the extra length 40 a of the wire harness 40 is extra. It is drawn in and accommodated in the long portion absorption space 72 so as to bend along the corner portion.
The hard tube 60 is pulled into the protector 70, and the grommet 50 is also moved to the protector 70 side in conjunction with the hard tube 60, and stops at a position where the pressing cylinder portion 56 of the grommet 50 contacts the closing wall 77. In this state, the door 10 is completely closed.

As described above, when the door 10 is opened and closed, the diaphragm portion is provided in the grommet 50 to provide the expansion and contraction and bending torsion functions. Therefore, the operation of the wire harness 40 can be smoothly followed.
And since the wire harness 40 which goes in and out of the through-hole 77a of the protector 70 is in the state protected by the hard tube 60, it does not slidably contact with the inner surface of the through-hole 77a, and enters and exits smoothly together with the hard tube 60, and a sudden door There is no risk of breakage when opening and closing. And compared with the case where only a wire harness is used, the wire harness is not loosened between the door 10 and the body 20 and is stretched while maintaining a straight state, and is sandwiched between the door 10 and the body 20. Absent.
Further, since the grommet 50 fixed to the tip of the hard tube 60 is not allowed to pass through the through hole 77a of the protector 70, the grommet 50 is stopped at the position of the through hole 77a of the protector 50 when the door is closed, and the amount of wire harness 40 drawn in is regulated. it can. In order to absorb the movement of the door 10 in the rotational direction, a space is provided between the hard tube 60 and the through hole 77a, but the grommet 50 is brought into contact with and pressed against the closing wall 77 of the protector 70. The hard tube 60 is also fixed together with the grommet 50, and it is possible to prevent the hard tube 60 from resonating with the body vibration and generating abnormal noise.

FIG. 7 shows a modification of the embodiment of the present invention.
In this modification, the pressing cylinder portion 56 of the grommet 50 is different from that of the above-described embodiment, and has a rectangular shape instead of a circular shape. The rigid tube locking groove 57 inside the pressing tube portion 56 is also provided in a quadrangular annular shape along the inner peripheral surface of the pressing tube portion 56. Therefore, the hard tube (not shown) fitted in the hard tube locking groove 57 is also a cylinder having a square cross section.

According to the above configuration, when the grommet 50 is shortened when the door is closed, the inner peripheral surface of the maximum outer cylinder portion 51 and the inner peripheral surface of the thin connecting cylinder portion 54 are indicated by T1 in FIG. The pressing cylinder 56 is held at a position indicated by T2 on the outer peripheral surface of the thin connecting cylinder 54. Therefore, the distal end of the hard tube 60 fitted in the hard tube locking groove 57 of the pressing tube portion 56 does not push into the body 20 beyond the attachment hole 22 of the body. Thereby, it is possible to prevent the grommet 50 from dropping from the mounting hole 22 which can be caused by opening the door while the hard tube 60 is pushed into the body 20. Further, when an impact is applied due to a road gap or the like during traveling, it is possible to prevent the peripheral edge of the through hole 77a from coming into contact with the hard tube 60 to generate abnormal noise.
In addition, while the thin connecting cylinder portion 54 has an annular shape, the pressing cylinder portion 56 has a quadrangular annular shape and has different outer peripheral shapes, so that the outer periphery of the thin connecting cylinder portion 54 is as described above. When the pressing cylinder portion 56 is clamped by the surface, the entire circumference is not in close contact, but the outer peripheral surface is in close contact with each other to provide an appropriate clamping force. Therefore, when the door is opened, the pressing cylinder part 56 is released from the sandwiching of the thin connecting cylinder part 54, and the grommet 50 can be brought into an extended state. As a result, when the door is opened, the grommet 50 is pulled out of the mounting hole 22 by being pulled to the door side together with the pressing cylinder part 56 in a state where the thin connecting cylinder part 54 is in close contact with the pressing cylinder part 56. Can be prevented.
In addition, since another structure and an effect are the same as that of the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The embodiment described above relates to a grommet used for wiring a wire harness that is bridged between a side door and a vehicle body of an automobile, but is not limited to a side door, and a vehicle body and a back door, a trunk lid and a body, In addition, it can also be suitably used for a wire harness spanned over an engine room or body.

The state which opened the side door of 1st Embodiment is shown, (A) is the side view seen from the room inner side, (B) is sectional drawing. The closed state of the side door is shown, (A) is a side view seen from the room side, and (B) is a sectional view. FIG. 5A is a side view of the grommet as viewed from the door side, FIG. 5B is a cross-sectional view taken along the line AA, and FIG. It is a perspective view of a hard tube. It is sectional drawing of a clamp. It is a perspective view which shows the state which attached the protective material to the wire harness. The grommet of a modification is shown, (A) is the side view seen from the door side, (B) is BB sectional drawing. It is a perspective view which shows the conventional wire harness wiring structure between a door and a vehicle body. It is drawing which shows the conventional grommet. It is a perspective view which shows the other conventional wire harness wiring structure between a door and a vehicle body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Side door 11 Inner panel 13 Weather strip 20 Body 21 Hinge 40 Wire harness 50 Grommet 58 Diaphragm part 70 Protector 72 Extra space absorption space 79 Slide space 82 Clamp

Claims (3)

A grommet that is integrally molded from rubber or elastomer, is externally mounted on a wire harness routed in an automobile, and is inserted and locked into a through-hole of the panel,
From the front end to the other end on the panel locking side, the maximum outer diameter cylindrical portion provided with a vehicle body locking portion on the outer peripheral surface, a large diameter cylindrical portion that is more compact than the maximum outer diameter cylindrical portion, a thin connecting cylindrical portion, and a small diameter cylindrical portion And a pressing cylinder part that is enlarged from the small-diameter cylindrical part and thickened continuously,
The large-diameter cylindrical part, the thin-walled cylindrical part, and the small-diameter cylindrical part constitute a diaphragm part, and the diaphragm part is inserted into the large-diameter cylindrical part in the folded state as the thin-walled cylindrical part,
When the tensile force of the inserted wire harness is loaded, the thin connecting tube portion is pulled out from the large diameter tube portion, and when the wire harness is bent, the thin connecting tube portion is bent. Grommet characterized by that. The grommet according to claim 1 is externally fitted to a wire harness, a hard tube is externally fitted to the wire harness pulled out from the pushing cylinder part of the grommet, and the distal end of the hard tube is inserted into the pushing cylinder part. And fix the other end of the hard tube to the wire harness,
The wire harness attached with the hard tube and the grommet is bridged between the body of the automobile and the opening / closing member hinged to the body,
The hard tube is slidably accommodated in a guide member provided on the opening / closing member, and can be pulled out from the opening provided in the guide member toward the body side, while the grommet is pushed when the opening / closing member is closed. A wiring structure of a wire harness in which the cylindrical portion is configured to be stopped by being pressed against a peripheral edge of the opening or a protruding member from the guide member. The opening / closing member is a side door, and a protector serving as the guide member is attached to the interior side surface of the inner panel of the side door. The wire harness is provided with an extra length portion and an extra length absorbing space is provided in the protector. Set up
The hard tube is slidably drawn out from the opening of the protector, is passed over the interior side of the weather strip from the indoor side to the body side, and when the side door is closed, the pressing tube portion of the grommet is positioned at the periphery of the opening of the protector. The wiring structure of the wire harness according to claim 2, wherein the wiring harness is configured to be pressed to restrict pulling of the wire harness toward the side door.

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