JPH09320371A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause wires to slide move against the extending, retracting, and bending of a grommet so as to prevent the bending and deflection of the wires and suppress disconnection and breakage by providing a large number of projections and depressions on the inner periphery face of the grommet touching a linear body in a grommet protecting the linear body laid therethrough. SOLUTION: An uneven face 14 equipped with a large number of fine projections and depressions is formed on the inner periphery face of a curve portion 13b provided in the vicinity of the door panel side fixing portion 12 of a grommet 1 holding a wire harness laid through from the fixing side opening portion of a vehicle main body or the like to the moving side opening portion of a door portion or the like. The wire harness is fixed at a vehicle body panel side fixing portion 11, and the door panel side fixing portion 12 side is set to be a free end. Against the extending, retracting, and bending of the grommet with the opening and closing of a door portion, the wire harness can freely moves by sliding in the wire harness laying direction owing to the uneven face so as to suppress deflection to suppress the disconnection of the wire harness and the breakage of the grommet at a moving portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for holding a linear body, and more particularly to holding and protecting a wire harness which is routed through from a fixed side opening of a vehicle body or the like to a movable side opening of a door or the like. Regarding the grommet.

[0002]

2. Description of the Related Art In recent years, wiring routes for vehicle wire harnesses have become complicated and diversified as electrical and electronic devices have been mounted on vehicles, and prevent contact between peripheral parts and the wire harness. Harness protector for
Wire harness holding parts such as grommets, which are used when a panel of a vehicle body is routed through, are often used.

In particular, for a wire harness having a path from an engine room to a driver's seat, a vehicle body to a side door part or a rear hatchback door part (trunk), etc. through an opening provided in a vehicle body panel, A grommet having a substantially conical shape or a bellows is used for holding the cable path, preventing contact with the panel of the vehicle body, and waterproofing the wire harness (preventing exposure).

FIG. 2 shows an example of a conventional grommet with bellows installed between the vehicle body and the door portion. FIG.
2A is an outline drawing, and FIG. 2B is A- in FIG. 2A.
It is a figure which shows the A cross section. In FIG. 2, 1 is a grommet, 11 is a vehicle body panel side fixed portion fitted and fixed to an opening of a fixed side panel (hereinafter referred to as a vehicle body panel) of a vehicle body or the like, and 12 is a movable side panel such as a door. A door panel side fixing portion 13 fitted and fixed to an opening (hereinafter referred to as a door panel), 13 is a flexible bellows portion provided between the fixing portions 11 and 12. The vehicle body panel side fixing portion 11 is provided with a wire harness holding portion 11a for tightly fixing a wire harness (not shown) and a locking portion 11b for fitting and fixing in an opening portion of the vehicle body panel. Further, the door panel side fixing portion 12 is provided with a locking portion 12b for fitting and fixing in the opening portion of the door panel.

FIG. 3 shows a state in which the grommet having such a structure is assembled to a vehicle body panel and a door panel and a state in which a door portion is opened and closed. In FIG. 3, 21 is a vehicle body panel and 22 is a door panel. As shown in FIGS. 3A and 3B, the grommet 1 bends in the bellows portion 13 and expands and contracts by opening and closing the door portion. A synthetic rubber having a high elasticity is usually used for such a grommet 1, and the watertightness (fitting fixing property) to the opening of the panel,
Expandability and flexibility are enhanced. Hereinafter, unless otherwise specified, the material of the grommet 1 is synthetic rubber.

[0006]

[Problems to be Solved by the Invention] The above-mentioned grommet 1
Fig. 4 shows a state in which the wire harness is routed through
Shown in The vehicle body panel side fixing portion 11 is fitted and fixed to the opening of the vehicle body panel 21, and the wire harness 14 that is pierced and routed in the wire harness holding portion 11a provided in the vehicle body panel side fixing portion 11 has the tape material 15 It is fixed tightly by The wire harness 14 is not fixed on the door panel side fixing portion 12 side, and the wire harness 14 is configured to be freely slidably movable with respect to expansion and contraction and bending of the bellows portion 13 associated with the opening / closing operation of the door portion.

Since the grommet 1 is made of synthetic rubber as described above, a large frictional resistance is generated between the bellows portion 13 and the wire harness 14 with respect to expansion and contraction and bending of the bellows portion 13. It adheres closely to the inner peripheral surface of the curved portion 13b provided in the vicinity. Therefore, in a state where the overall length of the grommet 1 is shortened such as when the door is closed, the wire harness 14 has the wire harness holding portion 11a of the vehicle body panel side fixing portion 11 and the door panel side fixing portion 1a.
Both ends are fixed to the curved portion 13b on the second side, and the bending of the wire harness 14 pushes and bends the flexible bellows portion 13 to form a bent portion 13a.

When the grommet 1 is repeatedly expanded and contracted and bent as the door is opened and closed, the wires forming the wire harness are broken due to bending fatigue, and the bent part 13a of the grommet 13 becomes a peripheral member. There are problems such as contact, abrasion, and damage. Conventionally, in the movable part as described above, a special electric wire having excellent flexibility has been used to prevent disconnection of the wire harness. Using such a special wire makes it easier for wire harness manufacturers to improve quality, but not only increases man-hours in parts management, but also significantly increases costs. It was.

An object of the present invention is to prevent the wire harness (electric wire) routed through the grommet from easily moving during opening / closing operation of the door portion to suppress the bending of the electric wire inside the grommet and the bending of the grommet. , To provide a grommet capable of preventing disconnection and damage.

[0010]

In order to achieve the above object, the present invention according to claim 1 provides a fixed side fixed portion and a movable side member, which are fitted and fixed in a predetermined opening of the fixed side member. A flexible part is provided between the movable side fixed parts fitted and fixed to the opening of the fixed side, the movable side fixed part, and the linear body penetrating through the flexible part through the fixed side. In a grommet that holds the linear body in close contact with either the fixed portion or the movable side fixed portion, in contact with the linear body during expansion and contraction or bending operation of the grommet caused by the movement of the movable side member. The inner peripheral surface of the grommet is provided with a large number of concavo-convex shapes.

That is, according to the present invention, in a grommet with bellows, one of the wire harnesses penetratingly arranged is a fixed end and the other is a free end, and the grommet inner peripheral surface with which the wire harness comes into contact when the grommet expands or contracts. It is characterized in that a surface shape for reducing frictional resistance, for example, unevenness is provided. Therefore, according to the configuration of the present invention, since the contact surface with the wire routed through can be reduced by the uneven surface provided on the inner peripheral surface of the grommet, the movable member can be moved, for example, opened and closed. The electric wire can be easily slid and moved in response to the expansion and contraction and bending of the grommet, and the bending of the electric wire can be suppressed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. FIG. 1 is a diagram showing an embodiment of the grommet of the present invention. The description of the configuration equivalent to the grommet shown in FIG. 2 is omitted. In FIG. 1, a curved portion 13b is provided near the door panel side fixed portion 12 (movable side fixed portion) of the grommet 1, and an uneven surface 14 having a large number of fine unevenness is formed on the inner peripheral surface thereof.

In the grommet 1 having such a structure,
As shown in FIG. 4, the wire harness holding portion 11a provided on the vehicle body panel side fixed portion 11 (fixed side fixed portion) fixes the wire harness 14 (the linear body) with a tape, and the other end of the door panel side fixed portion. By setting the 12 side as a free end, the wire harness 14 freely slides in the wiring direction with respect to expansion and contraction and bending of the grommet 1 due to opening and closing of the door portion, so that the bending of the wire harness 13 is suppressed, and the bellows are provided. Generation of the bent portion 13a in the portion 13 (flexible portion) is suppressed.

That is, the present invention is characterized in that a surface shape for reducing frictional resistance with an electric wire forming a wire harness is formed on an inner peripheral surface of a grommet,
In the present embodiment, the uneven surface 14 is shown as an example, but the present invention is not limited to this, and various forms such as a surface shape by graining, a wavy shape, a ridge shape, an island shape, and the like are conceivable.

Although the curved portion 13b in the vicinity of the door panel side fixing portion 12 is shown as the area for forming the uneven surface, the present invention is characterized by reducing the frictional resistance between the electric wire and the grommet inner peripheral surface. Therefore, by forming an uneven surface on the entire inner peripheral surface of the grommet to which the electric wires that are pierced and routed in close contact with the expansion and contraction and bending of the grommet are in contact, the electric wire can be effectively slid and moved. Needless to say.

[0016]

As described above, according to the grommet of the present invention, when the grommet expands or contracts due to the opening / closing operation of the door panel, an uneven surface is formed on the inner peripheral surface that comes into close contact with the wire routed through. By forming it, the contact area can be reduced and the frictional resistance can be reduced, so that the electric wire can be freely slid and moved, and the electric wire and the grommet can be prevented from bending. Therefore, it is possible to suppress disconnection of the wire harness and damage to the grommet in the movable portion without using an expensive special electric wire as in the conventional case.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a grommet according to the present invention.

FIG. 2 is a diagram showing an example of a conventional grommet.

FIG. 3 is a view showing an assembled state and operation of a conventional grommet.

FIG. 4 is a diagram illustrating a problem of a conventional grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 11 Body panel side fixed part (fixed side fixed part) 11a Wire harness holding parts 11b, 12b Locking part 12 Door panel side fixed part (movable side fixed part) 13 Bellows part (flexible part) 13a Bending part 13b Curve part 14 uneven surface 15 tape material 21 vehicle body panel (fixed side member) 22 door panel (movable side member)

Claims (1)

[Claims] 1. A flexible section is provided between a fixed side fixed section fitted and fixed in a predetermined opening of a fixed side member and a movable side fixed section fitted and fixed in a predetermined opening of a movable side member. , The fixed side and the movable side fixed part, the linear body penetratingly routed through the flexible part is closely held by either the fixed side fixed part or the movable side fixed part, and the linear body In the grommet that protects the grommet, a large number of uneven shapes are provided on the inner peripheral surface of the grommet that comes into contact with the linear body when the grommet expands and contracts due to the movement of the movable side member.