JP5918994B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet mounted in a grommet mounting hole for arranging a wire harness.

  For example, when a wire harness is routed through a hole in a vehicle body panel, a grommet is used to protect the electric wire around the vehicle body panel, waterproof the hole, and prevent dust (see Patent Documents 1 and 2). One conventional example of such a grommet is shown in FIG.

  In FIG. 5, the grommet 50 is formed from a rubber material. The grommet 50 includes an electric wire penetrating portion 52 having an electric wire insertion hole 54 and two vehicle body engaging portions 60 provided on the outer periphery of the electric wire penetrating portion 52 with a space therebetween. Each vehicle body engaging portion 60 is engaged with a grommet mounting hole 71 of the vehicle body panel 70.

  By the way, an electric wire (not shown) is passed through the wire insertion hole 54 of the grommet 50 using a pipe (not shown). That is, the outer diameter is slightly smaller than the inner diameter of the electric wire insertion hole 54 and the electric wire is passed through the pipe having a small frictional resistance, and the pipe through which the electric wire is passed is passed through the electric wire insertion hole 54. After completely passing the pipe through the electric wire insertion hole 54, only the pipe is extracted from the electric wire insertion hole 54. Thus, the electric wire can be passed through the electric wire insertion hole 54.

JP 2011-131617 A JP 2009-296738

  However, in the conventional grommet 50, when the pipe is inserted into the electric wire insertion hole 54, since the outer peripheral surface of the pipe is in surface contact with the inner peripheral surface of the electric wire insertion hole 54, a large frictional resistance is received. There was a very bad problem. The longer the electric wire insertion hole 54, the greater the frictional resistance acting on the pipe, resulting in poor workability. In the worst case, the grommet may be damaged.

  Then, this invention is made | formed in order to solve the above-mentioned subject, and it aims at providing the grommet with a good electric wire insertion workability | operativity.

The present invention is a grommet including a wire penetration portion having a wire insertion hole through which an electric wire is inserted, and a vehicle body engagement portion provided on an outer periphery of the wire penetration portion and engaged with a grommet mounting hole of a vehicle body. And the inner peripheral surface of the said electric wire penetration hole is a grommet characterized by being formed in the embossed surface.

  It is preferable that waterproof ribs protrude from the end of the wire insertion hole along the circumferential direction.

  According to the present invention, when a pipe through which an electric wire is passed is inserted into the electric wire insertion hole, the contact area between the pipe and the electric wire penetrating portion is reduced as compared with the conventional example, and the frictional resistance can be reduced. Therefore, the electric wire insertion work is good.

The 1st reference example of this invention is shown, (a) Front view of a grommet, (b) is a side view of a grommet, (c) is the sectional view on the AA line of (a), (d) is (c). It is a B section enlarged view. It is a perspective view which shows the 1st reference example of this invention and demonstrates the process of inserting a pipe into the electric wire penetration hole of an electric wire penetration part. The 2nd reference example of this invention is shown, (a) Front view of a grommet, (b) is a side view of a grommet, (c) is CC sectional view taken on the line of (a), (d) is (c). It is a D section enlarged view. 1 shows an embodiment of the present invention, (a) a front view of the grommet, (b) a side view of the grommet, (c) a sectional view taken along line EE of (a), and (d) an F of (c). FIG. A conventional example is shown, (a) a front view of the grommet, (b) a side view of the grommet, (c) a sectional view taken along the line GG of (a), and (d) an enlarged view of the H portion of (c). is there.

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

(First Reference Example )
1A to 1D show a first reference example of the present invention. 1A to 1D, the grommet 1A is made of, for example, a rubber material. The grommet 1 </ b> A includes a cylindrical wire penetration portion 2 and a vehicle body engagement portion 10 provided integrally at two locations of the wire penetration portion 2.

  Each vehicle body engagement portion 10 is integrally provided on the outer peripheral side of the wire penetration portion 2. One side of each vehicle body engaging portion 10 is formed with a tapered surface 11 that is inclined from the inner peripheral side toward the outer peripheral side. Engaging grooves 12 are formed on the outer periphery of each vehicle body engaging portion 10 over the entire circumference. The peripheral edge of the grommet mounting hole 21 of each vehicle body panel 20 enters the engagement groove 12 and is engaged with the vehicle body panel 20. The inner peripheral side of the grommet mounting hole 21 and the outer peripheral side of each vehicle body engaging portion 10 are in close contact over the entire periphery. This prevents water, dust and the like from entering and exiting through the grommet mounting hole 21.

  Two bellows portions 3 are formed at positions between the two vehicle body engaging portions 10 of the wire penetration portion 2. When the distance between two vehicle body panels 20 (for example, one is a vehicle body panel and the other is a door panel) is relatively changed, the grommet 1A can follow the expansion and contraction of the bellows part 3. A circular wire insertion hole 4 is formed inside the wire penetration portion 2. Four ribs 5 project from the inner peripheral surface of the wire insertion hole 4 along the wire insertion direction L substantially over the entire length. The four ribs 5 are arranged at equally spaced positions in the circumferential direction.

  Next, the wire insertion work of the grommet 1A will be described. First, an electric wire (not shown) is passed through the pipe 22 having low frictional resistance and high rigidity. Next, as shown in FIG. 2, the pipe 22 through which the electric wire is passed is passed through the electric wire insertion hole 4 of the electric wire penetration portion 2. After passing the pipe 22 through the electric wire insertion hole 4, only the pipe 22 is extracted from the electric wire insertion hole 4 while leaving the electric wire. Thus, the electric wire can be passed through the electric wire insertion hole 4.

  In the process of inserting the pipe 22 into the electric wire insertion hole 4, the outer peripheral surface of the pipe 22 comes into contact (substantially line contact) with the rib 5 of the electric wire insertion hole 4, and the contact between the pipe 22 and the electric wire penetrating portion 2 as compared with the conventional example. Since the area is small, the pipe 22 can be inserted with a small frictional resistance. Even in the process of pulling out only the pipe 22 from the wire insertion hole 4, the pipe 22 can be pulled out with a small frictional resistance for the same reason. Therefore, the wire insertion workability is good.

(Second reference example )
3A to 3D show a second reference example of the present invention. Grommet 1B of the second reference example, as compared to that of the first ginseng Reference Example, the ribs 5 of the inner peripheral surface of the wire insertion hole 4 is not provided on the end portion of the wire insertion hole 4. And, at the end of the electric wire insertion hole 4 where the rib 5 is not provided, one waterproof rib 6 is provided to project over the entire circumference along the circumferential direction.

Since other configurations are the same as those in the first reference example , the same components are denoted by the same reference numerals and description thereof is omitted.

In the second reference example , the wire insertion workability is good for the same reason as in the first reference example .

  At the end of the wire insertion hole 4, a waterproof rib 6 is projected along the circumferential direction. Therefore, intrusion of water, dust and the like from the wire insertion hole 4 can be prevented as much as possible.

( One embodiment)
4A to 4D show an embodiment of the present invention. Grommet 1C of this embodiment is different from that of the first reference example differs from the following points. That is, the rib 5 is not projected on the inner peripheral surface of the wire insertion hole 4. Instead, the inner peripheral surface of the electric wire insertion hole 4 is subjected to a texture process and is formed on the textured surface. The uneven shape of the texture processing is preferably a shape that can minimize the contact area with the pipe.

Since other configurations are the same as those in the first reference example , the same components are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, in the process of inserting the pipe into the wire insertion hole 4, in contact with the inner peripheral surface outer circumferential surface of the pipe is embossed in the electric wire insertion hole 4, pipe and wire insertion portion 2 as compared to the conventional example Since the contact area between them is small, the pipe can be inserted with a small frictional resistance. Even in the process of pulling out only the pipe from the wire insertion hole 4, the pipe can be pulled out with a small frictional resistance for the same reason. Therefore, the wire insertion workability is good.

As in the second reference example , one end of the waterproof rib 6 may protrude from the end of the wire insertion hole 4 along the circumferential direction.

(Modification)
In the first reference example , ribs 5 project from the inner peripheral surface of the wire insertion hole 4, and in one embodiment, the inner peripheral surface of the wire insertion hole 4 is a textured surface. Ribs 5 may be provided on the inner peripheral surface, and the inner peripheral surface may be a textured surface.

In the first and second reference examples , four ribs 5 project from the inner peripheral surface of the wire insertion hole 4, but may be one, two, three, or five or more. There may be. The rib is straight but may be curved (spiral).

In the second reference example , one waterproof rib 6 protrudes from the end of the wire insertion hole 4, but a plurality of (two, three, etc.) may be used.

1A, 1B Grommet 2 Electric wire penetration part 4 Electric wire insertion hole 5 Rib 6 Waterproofing rib 10 Car body engaging part 20 Car body panel (vehicle body)
21 Grommet mounting hole

Claims (3)

A grommet provided with a wire penetration portion having a wire insertion hole through which an electric wire is inserted, and a vehicle body engagement portion provided on the outer periphery of the wire penetration portion and engaged with a grommet mounting hole of a vehicle body,
The grommet characterized in that an inner peripheral surface of the wire insertion hole is formed on a textured surface . The grommet according to claim 1,
  A grommet characterized in that a rib protrudes from the inner peripheral surface of the electric wire insertion hole along the electric wire insertion direction. The grommet according to claim 1 or claim 2,
A grommet characterized in that a waterproof rib protrudes from the end of the wire insertion hole along the circumferential direction.

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