JP2003032855A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet for attaining easy and complete movement adjustment of a cable retaining tubular part to a wire harness after inserting the wire harness in the cable retaining tubular part without degrading waterproofing capability. SOLUTION: This grommet 10 includes the cable retaining tubular part 11 inserted with the wire harness 7, and the inner wall 11a of the cable retaining tubular part 11 annularly protruded with a plurality of expanding sections 12, 13 respectively. The inside diameter of the expanding section 12 on the front end side of the cable retaining tubular part 11 is formed so as to become smaller than that of the expanding section 13 on the base end 11c side of the cable retaining tubular part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is attached to a mounting hole or the like formed in a vehicle panel of an automobile and holds a wire harness (electric wire bundle) and which has excellent waterproofness.

[0002]

2. Description of the Related Art As this type of grommet, there is one shown in FIGS. As shown in FIG. 3, this grommet 1 has a cylindrical electric wire holding tubular portion 2 through which a wire harness 7 is inserted, and a substantially conical tubular shaped inclined portion 4 from the base end of the electric wire holding tubular portion 2. The large-diameter cylindrical portion 5 is integrally formed and has a fitting groove 5a that is fitted into the mounting hole 9 of the vehicle panel 8. As shown in FIG. 4, a plurality of lip portions (bulging portions) having the same inner diameter D are provided on the inner wall 2a of the wire holding tubular portion 2.
3 are integrally formed in a ring shape. The inner diameter D of each lip portion 3 is the outer diameter (diameter) of the wire harness 7.
It is set to be slightly smaller than R (D <
R).

When the wire harness 7 is inserted into the electric wire holding cylinder portion 2 of the grommet 1 and held, the wire harness 7 shown in FIG.
The diameter expander 6 shown in is used. The diameter expander 6 has, for example, four diameter expansion rods 6 a that are inserted into the electric wire holding cylinder 2. By moving each of the diameter expanding rods 6a in the direction of separating, the diameter of the electric wire holding tubular portion 2 is expanded, and after inserting the wire harness 7 into the expanded diameter of the electric wire holding tubular portion 2, 6a is moved in the approaching direction and pulled out. As a result, the electric wire holding tubular portion 2 elastically returns to be reduced in diameter, and the plurality of lip portions 3 are brought into close contact with the outer periphery of the wire harness 7 to ensure waterproofness.

A technique relating to this grommet 1 is disclosed in Japanese Patent Laid-Open No. 8-107620.

[0005]

However, in the above-mentioned conventional grommet 1, the wire harness 7 is inserted into the electric wire holding cylinder portion 2 through the diameter expanding rod 6a of the diameter expanding machine 6, and the electric wire holding cylinder portion 2 is inserted. After pulling out the diameter-expanding rod 6a of the diameter-expanding machine 6 from the inside, in order to align the grommet 1 with the regular position with respect to the wire harness 7, the electric wire holding tubular portion 2 of the grommet 1 is adjusted to the regular position of the wire harness 7. When moving to the position, since the inner diameters D of the plurality of lip portions 3 are all the same diameter, the tightening of each lip portion 3 becomes strong and the movement adjustment work is difficult. In particular, the outer diameter R of the wire harness 7 varies greatly depending on the vehicle grade and vehicle type.
The larger the diameter of the wire harness 7, the stronger the tightening of the plurality of lip portions 3, and the more difficult the work of adjusting the movement of the wire holding tubular portion 2 of the grommet 1 with respect to the wire harness 7.

[0006] Therefore, the present invention has been made to solve the above-mentioned problems, and the electric wire holding cylinder portion for the wire harness after the wire harness is inserted into the electric wire holding cylinder portion without lowering the waterproof property. An object of the present invention is to provide a grommet capable of easily and surely performing the movement adjustment work of.

[0007]

According to a first aspect of the present invention, there is provided an electric wire holding tubular portion through which a wire harness is inserted, and a plurality of bulging portions are formed in an annular shape on an inner wall of the electric wire holding tubular portion. In the grommet, the inner diameter of the bulging portion on the distal end side of the electric wire holding tubular portion and the inner diameter of the bulging portion on the proximal end side of the electric wire holding tubular portion are formed to be different.

In this grommet, when the wire holding tubular portion is moved with respect to the wire harness after the wire harness is inserted into the wire holding tubular portion and the grommet is aligned to the proper position, the respective bulges of the wire harness are expanded. Since a strong portion and a weak portion are generated in the tightening of the portion, the electric wire holding tubular portion of the grommet is easily and surely moved with respect to the wire harness to align the grommet. Also,
The bulging portions having different inner diameters ensure close contact between the electric wire holding tubular portion and the wire harness, and the entry of water between the electric wire holding tubular portion and the wire harness is reliably prevented.

A second aspect of the present invention is the grommet according to the first aspect, wherein the distal end side of the electric wire holding tubular portion is formed into a substantially conical tubular shape, and the proximal end side of the electric wire holding tubular portion is cylindrical. And the inner diameter of the bulging portion on the distal end side is smaller than the inner diameter of the bulging portion on the base end side.

In this grommet, when the wire holding tubular portion of the grommet is moved and adjusted with respect to the wire harness after the wire harness is inserted into the electric wire holding tubular portion, the wire is tightly tightened. From the bulging part on the tip side of the substantially conical tubular shape of the holding tubular part to the direction of the bulging part on the cylindrical proximal end side of the wire holding tubular part where the tightening is weak, the wire holding tubular part of the wire harness is simple and secure. Move to. In particular,
Even when the outer diameter of the wire harness is large, the work of adjusting the movement of the grommet with respect to the wire harness after the wire harness has been inserted into the electric wire holding tubular portion is easily performed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a grommet according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the grommet.

As shown in FIG. 1, the grommet 10 includes an electric wire holding tubular portion 11 through which the wire harness 7 is inserted, and a base portion 11c of the electric wire holding tubular portion 11 and a substantially conical tubular inclined portion 14. Vehicle panel (attached body) 8 formed integrally
And a large diameter cylindrical portion 15 having a fitting groove (fitting portion) 15a fitted into the mounting hole 9 of the electric wire holding tubular portion 1
1, the inclined portion 14 and the large-diameter cylindrical portion 15 are integrally formed of a soft material such as rubber.

As shown in FIGS. 1 and 2, the electric wire holding cylinder portion 11 has a substantially conical cylinder shape (trumpet shape) from the tip 11b to the center side.
And the base end 11c is formed in a cylindrical shape from the center side of the electric wire holding tubular portion 11. The inner wall 11a of the electric wire holding tubular portion 11 on the side of the substantially conical tubular tip 11b is
A pair of lip parts (bulging parts) 12, 12 having the same inner diameter D1
Are formed integrally with each other in an annular shape. Further, a pair of lip portions (bulging portions) 13, which have the same inner diameter D2, are formed on the inner wall 11a of the wire holding tubular portion 11 on the side of the cylindrical base end 11c.
13 are formed integrally with each other in an annular shape.

The inner diameter D1 of each lip portion 12 of the electric wire holding tubular portion 11 on the side of the substantially conical tubular tip 11b is equal to the inner diameter D2 of each lip portion 13 of the electrical wire holding tubular portion 11 on the cylindrical base end 11c side. It is formed to be smaller (D1 <D
2). Further, the inner diameter D2 of each lip portion 13 on the cylindrical base end 11c side of the wire holding tubular portion 11 is set to be slightly smaller than the outer diameter (diameter) R of the wire harness 7 (D2 <R ). Specifically, each lip portion 12 on the side of the substantially conical tubular tip 11b of the wire holding tubular portion 11 is set to an inner diameter having a tightening force of 5 to 20% with respect to the minimum wire diameter of the wire harness 7 used. Has been done. Further, each of the lip portions 13 on the cylindrical base end 11c side of the electric wire holding tubular portion 11 is set to an inner diameter equal to or smaller than the minimum electric wire diameter of the wire harness 7 to be used, and an adhesive tape is provided on the outer periphery of the electric wire holding tubular portion 11. Two
The wire holding cylinder portion 11 is prevented from becoming wrinkled (uneven) when 0 is wound.

Further, as shown in FIG. 2, the wire holding tubular portion 1
1, a pair of lip portions 12 on the side of the substantially conical cylindrical tip 11b,
The height dimension H of the inner lip portion 12 out of 12 is higher (longer) than the remaining outer lip portion 12 and each lip portion 13 on the cylindrical base end 11c side of the electric wire holding tubular portion 11. . The outer lip portion 1 of the pair of lip portions 12, 12 on the side of the substantially conical tubular tip 11b of the wire holding tubular portion 11 is provided.
2 height dimension and cylindrical base end 11c of the electric wire holding tubular portion 11
The heights of the respective lip portions 13 on the side are substantially the same. An annular tape stop portion 11d is integrally formed on the outer wall of the electric wire holding cylinder portion 11 on the tip end 11b side.

According to the grommet 10 of the above embodiment,
The distal end 11b side of the electric wire holding tubular portion 11 is formed into a substantially conical tubular shape, and the base end 11c side of the electric wire holding tubular portion 11 is formed into a cylindrical shape, and the pair of lip portions 12 of the inner wall 11a on the distal end 11b side is formed. Since the inner diameter D1 of 12 is smaller than the inner diameter D2 of the pair of lip portions 13, 13 of the inner wall 11a on the base end 11c side, the diameter expanding rod 6a of the diameter expanding machine 6 shown in FIG.
After inserting the wire harness 7 into the electric wire holding tubular portion 11 via the
When the electric wire holding tubular portion 11 of No. 1 is moved and adjusted to align the grommet 10 with the regular position, the electric wire holding tubular portion 11 of the grommet 10 is moved in the direction of the arrow X in FIG. 2 (the electric wire holding tubular portion 11 having a strong tightening force). A pair of lip portions 12 on the side of the tip 11b having a substantially conical tubular shape, and a pair of lip portions 13 on the side of the cylindrical base end 11c of the wire holding tubular portion 11 having a weak tightening force.
The direction of the grommet 10 can be smoothly adjusted by moving the grommet 10 in the direction (13)) easily and surely.

At this time, the height dimension H of the inner lip portion 12 of the pair of lip portions 12, 12 on the side of the substantially conical tubular tip 11b of the electric wire holding tubular portion 11 is the remaining lip portion 12 and the electric wire. Since it is higher than each lip portion 13 on the cylindrical base end 11c side of the holding tubular portion 11, the inner lip portion 12
Due to the elastic deformation, the movement adjustment work of the electric wire holding cylinder portion 11 of the grommet 10 with respect to the wire harness 7 can be performed extremely smoothly and easily. In particular, even if the outer diameter of the wire harness 7 becomes large due to a change in vehicle grade or vehicle type, etc., the grommet 10 for the wire harness 7 after the wire harness 7 is inserted into the wire holding tubular portion 11 is inserted.
It is possible to easily and surely perform the movement adjustment work of the electric wire holding tubular portion 11.

Further, after aligning the grommet 10 with the regular position of the wire harness 7, the grommet 10
By winding the adhesive tape 20 around the outer circumference of the electric wire holding cylinder portion 11 and further tightening the same, the lip portions 12 and 13 having different inner diameters are surely brought into close contact with the wire harness 7. As a result, the gap between the inner wall 11a of the electric wire holding tubular portion 11 and the outer periphery of the wire harness and 7 is reliably sealed by the lip portions 12 and 13, and water is reliably prevented from entering the electric wire holding tubular portion 11. be able to. In this state, grommet 10
Is mounted in the mounting hole 9 of the vehicle panel 8.

According to the above-described embodiment, a pair of lip portions having the same inner diameter are integrally formed in an annular shape on the inner wall of the electric wire holding cylinder portion on the tip side of the substantially conical cylinder, and the electric wire holding cylinder portion is formed integrally. The inner wall of the base end of the cylindrical shape is the same as the inner diameter of the lip portion of the distal end side and a pair of lip portions having a larger diameter than the inner diameter of the lip portion of the distal end side are described as integrally projecting in an annular shape. It is also possible to integrally project three or more lip portions having a sealing function on the inner wall on the end side.

[0021]

As described above, according to the first aspect of the invention, the inner diameter of the bulging portion on the tip side of the electric wire holding tubular portion and the inner diameter of the bulging portion on the proximal end side of the electric wire holding tubular portion are Since the wire harness is formed differently, when the wire holding tubular portion is moved with respect to the wire harness after the wire harness is inserted into the wire holding tubular portion and the grommet is aligned to the proper position, each expansion for the wire harness is performed. It is possible to generate a strong portion and a weak portion for tightening the protruding portion, and it is possible to easily and surely move the electric wire holding tubular portion of the grommet with respect to the wire harness, and to easily align the grommet.

According to the second aspect of the present invention, the tip end side of the electric wire holding tubular portion is formed into a substantially conical tubular shape, and the base end side of the electric wire holding tubular portion is formed into a cylindrical shape so that the tip end side bulges out. Since the inner diameter of the portion is formed to be smaller than the inner diameter of the bulging portion on the proximal end side, after inserting the wire harness into the wire holding tubular portion, the wire holding tubular portion of the grommet is moved and adjusted with respect to the wire harness. When aligning the grommet to the proper position with the grommet, place the wire holding tube of the grommet from the bulging part on the tip side of the substantially conical tubular shape The position of the grommet can be smoothly adjusted by simply and surely moving it in the direction of the bulging portion side of the cylindrical base end side. In particular, even when the outer diameter of the wire harness is large, it is possible to easily perform the movement adjustment work of the grommet with respect to the wire harness after the wire harness is inserted into the wire holding tubular portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a grommet according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the grommet.

FIG. 3 is a sectional view of a grommet of a conventional example.

FIG. 4 is an enlarged cross-sectional view of a main part of the grommet of the conventional example.

FIG. 5 is an explanatory diagram when the wire harness of the grommet of the conventional example is inserted.

[Explanation of symbols]

7 wire harness 10 Grommet 11 Electric wire holding cylinder 11a inner wall 11b tip 11c base end 12,12 A pair of lip parts (bulging parts) D1 inner diameter 13,13 A pair of lip parts (bulging parts) D2 inner diameter

Claims (2)

[Claims] 1. A grommet having an electric wire holding tubular portion through which a wire harness is inserted, and a plurality of bulging portions annularly protrudingly formed on an inner wall of the electric wire holding tubular portion. The grommet is characterized in that the inner diameter of the bulging portion of the wire is different from the inner diameter of the bulging portion on the base end side of the wire holding tubular portion. 2. The grommet according to claim 1, wherein the distal end side of the electric wire holding tubular portion is formed into a substantially conical tubular shape, and the proximal end side of the electric wire holding tubular portion is formed into a cylindrical shape, A grommet characterized in that the inner diameter of the bulging portion on the tip end side is smaller than the inner diameter of the bulging portion on the base end side.