JP2002152949A - Grommet and wiring harness with grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable cut-off treatment, even if a wiring harness is branched from a part near a grommet-attaching position. SOLUTION: This grommet has a first small diameter cylindrical part, through which a wiring harness is tightly fitted and inserted, an expanded diameter cylindrical part continuous with the first small diameter cylindrical part, and a body-engaging recessed part formed on the outer circumferential surface of the expanded diameter cylindrical part. A closing part is formed on the large diameter side of the expanded diameter cylindrical part, and a second small diameter cylindrical part is formed continuously with the center of the closing part. The first small diameter cylindrical part, the expanded diameter cylindrical part, and the second small diameter cylindrical part are formed continuously to each other, on a common axis and one of the first small diameter cylindrical part, and the second small diameter cylindrical part is used as a cut-off part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet and a wire harness with a grommet to be mounted on a wire harness inserted into a through hole of a vehicle body panel or the like. In a grommet of a type to be filled, even if a branch point of a wire harness is close to a grommet mounting position, a water stopping process can be performed.

[0002]

2. Description of the Related Art Grommets are used for wiring, harnessing, waterproofing, soundproofing, and the like when wiring a vehicle wiring harness from an engine room to a room. The wire harness is inserted through the grommet, passes through the through hole of the vehicle body panel that separates the engine room and the room, and the grommet is attached to the through hole to seal the through hole.

As shown in FIG. 5, a grommet 51 is made of a molded article of rubber or an elastomer, and has a small-diameter cylindrical portion 52 through which a wire harness W / H is inserted in close contact, and a continuous portion at one end of the small-diameter cylindrical portion 52. A diameter-enlarging cylinder 53 having a vehicle body locking recess 53a that extends outward to expand the diameter and locks to the vehicle body panel P on the outer peripheral surface is provided. In the grommet, a waterproof agent is injected into the small-diameter cylindrical portion 52 so as to fill the gap between the electric wire groups of the wire harness and the electric wires and the inner peripheral surface of the cylindrical portion in order to enhance the waterproof performance.

[0004]

However, when the branch point Q of the wire harness W / H is close to the water stop portion as shown in FIG. Branch point Q from the center of the water stop shown by the oblique line
Is less than 100 mm, it is determined that water stoppage treatment is not permitted according to practical standards. Therefore, it is necessary to separate the branch position of the wire harness from the grommet, and there is a problem that it is not possible to branch near the position protruding from the grommet.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and has as its object to provide a water stopping process in a grommet even when a branch point of a wire harness is close.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first small-diameter tube portion into which a wire harness is closely fitted and inserted, and a large-diameter tube portion continuous with the first small-diameter tube portion. ,
A vehicle body locking recess is provided on the outer peripheral surface of the enlarged diameter cylinder portion, a closing portion is provided on a large diameter end side of the enlarged diameter cylinder portion, and a second small diameter cylinder portion is continuous from the center of the closed portion, A grommet characterized in that one small-diameter tube portion, a large-diameter portion, and a second small-diameter tube portion are coaxially continuous and one of the first small-diameter tube portion and the second small-diameter tube portion is used as a water-stop portion. are doing.

In the grommet of the present invention described above, the first and second small-diameter cylindrical portions are made of rubber or elastomer, and are formed between one side in the axial direction and the other side in the axial direction with respect to the vehicle body locking concave portion of the large-diameter cylindrical portion. It is provided on both, and one of them can be a water stop section. Therefore, when the branch point of the wire harness is close to the branch point of the wire harness, the small-diameter cylindrical portion farther from the branch point of the wire harness is used as a water stop portion, so that the distance between the branch point of the wire harness and the water stop portion is equal to or larger than the standard It can be. As described above, when the branch point of the wire harness is close to the branch point of the wire harness, the grommet is made easy to use by selectively setting the water stop portion in the small-diameter cylindrical portion far from the branch point of the wire harness. Can be.

In the grommet, the enlarged-diameter cylinder has a double-cylinder structure of an inner cylinder and an outer cylinder, a space for sound insulation is provided inside, and the vehicle body engaging recess is provided in the outer cylinder of the enlarged-diameter cylinder. Alternatively, the inner cylinder may be continuous between the first small-diameter cylindrical portion and the second small-diameter cylindrical portion, and the inner cylinder and the outer cylinder may be continuous via the distal-side closed portion of the enlarged-diameter cylindrical portion. With the above configuration, a grommet for sound insulation can be obtained.

Further, a small-diameter pipe portion for inserting a cable or a hose may be protruded from the outer cylinder of the large-diameter cylinder portion on the side of the first small-diameter cylinder portion. The distal end of the small-diameter tube is closed, and when a hood opener cable or the like such as a hose for a washer is inserted, the closed portion is cut to allow insertion.

Further, in the present invention, a wire harness is inserted through the grommet, and one of the first small-diameter tubular portion and the second small-diameter tubular portion, which is a water-stop portion, is provided with the water-stop portion. The distance between the center of the portion and the branch position of the wire harness extending from the tip of the small-diameter cylindrical portion is greater than or equal to a set dimension,
The other side, which is not the water stop portion, provides a grommet-equipped wire harness having a size equal to or less than the set dimension.

In the above-described wire harness with grommets, the distance between the branch point of the wire harness and the water stopping portion can be set to a reference set size (100 mm) or more, and the branch point of the wire harness is opposite to the water stopping portion. On the side, it can be branched near the position coming out of the grommet.

In the water stopping process, the wire group of the wire harness through which the grommet is passed is filled with a water stopping agent in advance, and in this state, the wire is passed through the grommet and the water stopped portion is subjected to the first water stopping process.
The small-diameter tube portion or the second small-diameter tube portion is internally fitted, and is fixed to the small-diameter tube portion by tape winding.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a grommet according to an embodiment of the present invention. As shown in FIG. 2, the grommet 1 has a body panel P that separates an engine room and a room when a wire harness W / H is inserted therethrough. It is a waterproof type that is mounted in a through hole and that fills the grommet 1 with a waterproofing agent.

The grommet 1 of the present embodiment is a molded product of rubber or an elastomer, and as shown in FIGS. 1 to 3, a first small-diameter tube portion 2 and a large-diameter tube connected to the first small-diameter tube portion 2. A cylinder portion 3 is provided with a vehicle body locking recess 4 on the outer peripheral surface of the enlarged diameter cylinder portion 3, a closing portion 3 a is provided on a large diameter end side of the enlarged diameter cylinder portion 3, and a second small diameter is provided from the center of the closing portion 3 a The cylindrical portion 5 is continuous.

The enlarged-diameter cylinder portion 3 has a double cylinder structure of an inner cylinder 6 and an outer cylinder 7, a sound-insulating gap 8 is provided inside, and the outer cylinder 7 is provided with the vehicle body locking recess 4. . The outer cylinder 7 is formed by folding back from the tip of the inner cylinder 6 and the folded portion is the closing portion 3a. The inner cylinder 6 is continuous between the first small-diameter cylinder part 2 and the second small-diameter cylinder part 5, and the small-diameter cylinder part (2, 6, 5) through which the wire harness is inserted.
Are provided along the central axis of the grommet 1.

The first small-diameter cylindrical portion 2 and the second small-diameter cylindrical portion 5 on both sides have cuts 2a, 5a formed at the front end openings, and annular ribs 2b are formed on the inner peripheral surface at positions inside the cuts. , 5b.

In the grommet 1, the first small-diameter cylindrical portion 2 and the second small-diameter cylindrical portion 5 are provided on both the one axial side and the other axial side with respect to the vehicle body engaging recess 4 of the large-diameter cylindrical portion 3. When the branch point of the wire harness W / H is close, a small-diameter cylindrical portion farther from the branch point of the wire harness is selected as a water stop portion.

That is, the wire group of the wire harness is filled with a waterproofing agent at a predetermined position in advance to stop the water between the lines, and in this state, the first small-diameter cylindrical portion 2, the inner cylinder 6, and the (2) Insert the wire harness W / H into the small-diameter cylindrical portion 5. At that time,
The water stop area where the water has been stopped beforehand is defined as a wire harness W / H.
Of the first small-diameter tube portion 2 or the inside of the second small-diameter tube portion 5 set in relation to the branch position. Next, the tip of the small-diameter cylindrical portion on which the inter-line water-stop portion is fitted and the wire harness are fixedly wound around the tape T1. At the time of this tape winding, the annular rib 2b or 5b is pressed against the electric wire group to improve the sealing property.

That is, as shown in FIG. 2, the branch point Q1 of the wire harness W / H is close to the first small-diameter cylindrical portion 2 on the grommet 1, and the branch point Q1 is located at 10 degrees from the center of the first small-diameter cylindrical portion 2.
If it is 0 mm or less, the inter-line water stop portion S indicated by a point in the figure is fitted inside the second small diameter tube portion 5 side, and the second small diameter tube portion 5 is used as a water stop portion. As described above, by using the second small-diameter cylindrical portion 5 side as the water stopping portion, a branch point can be provided on the first small-diameter cylindrical portion 2 side at a position outside the distal end opening of the cylindrical portion 2. On the first small-diameter cylinder portion 2 side, it is necessary to close the opening end between the outer cylinder 7 and the inner cylinder 6 of the large-diameter cylinder section 3 to seal the gap 8,
The tape T2 is wound.

On the other hand, as shown in FIG. 3, a branch point Q2 of the wire harness W / H is close to the second small-diameter cylinder portion 5 on the grommet 1, and the branch point Q2 is located 10 degrees from the center of the second small-diameter cylinder portion 5.
If it is 0 mm or less, the inter-line water blocking portion S
To make the first small-diameter cylindrical portion 2 a water-stop portion. As described above, by making the first small-diameter cylindrical portion 2 side a water stop portion,
On the side of the second small-diameter cylindrical portion 5, a branch point can be provided at a position outside the distal end opening of the cylindrical portion 5. When the wire harness and the grommet are tape-wound on the first small-diameter tube portion 2 side as described above, the tape T1 'is moved from the position where the open ends of the outer tube 7 and the inner tube 6 of the large-diameter tube portion 3 are closed. Is wound.

The grommet of the present invention is not limited to the above embodiment. As shown in FIG. 4, a cable or a hose for inserting a cable or a hose into the pair of first small-diameter cylinders 2 is provided on the outer cylinder 7 of the large-diameter cylinder 3. A small-diameter tube portion 20 is provided in a protruding manner. The distal ends of these small-diameter pipe sections 20 are cut off when a hood opener cable or washer hose is inserted so that the cable or the hose penetrates.

Further, although not shown, the enlarged diameter cylindrical portion does not necessarily have to be a double cylindrical shape composed of an inner cylinder and an outer cylinder, and is provided only with a cylindrical portion having a vehicle body locking recess on the outer peripheral surface.
The first and second small diameter cylindrical portions need not be continuous with the inner cylinder.

[0023]

As is apparent from the above description, according to the grommet according to the present invention, the first small-diameter cylindrical portion and the second small-diameter cylindrical portion are provided on both sides of the large-diameter cylindrical portion provided with the vehicle body locking concave portion. Is established,
Either one can be selected as the water stopping portion, so that the small diameter cylindrical portion on the opposite side to the branching position can be used as the water stopping portion according to the branching form of the wire harness through which the grommet passes. As a result, the branch point of the wire harness can be provided at a position protruding from the grommet on the side opposite to the water stop side.

[Brief description of the drawings]

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

FIG. 2 is a front view showing an example of a water stop position of the grommet.

FIG. 3 is a front view showing another example of the water stop position of the grommet.

FIG. 4 is a cross-sectional view showing another embodiment.

FIG. 5 is a cross-sectional view of a conventional grommet.

FIG. 6 is a view showing a problem of a conventional grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 1st small-diameter cylinder part 3 Large-diameter cylinder part 4 Car body locking concave part 5 2nd small-diameter cylinder part 6 Inner cylinder 7 Outer cylinder W / H Wire harness P Body panel T Tape Q1, Q2 Junction point S of wire harness Water stop section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01B 7/00 301 H01B 17/58 C 17/58 H02G 3/04 J H02G 3/04 F16L 5/02 A 3/38 H02G 3/28 FF term (reference) 3J040 AA01 AA13 BA01 EA01 EA16 FA05 HA15 5G309 AA09 5G333 AA07 AA09 AA11 AA13 AB16 AB22 AB28 BA01 CB19 CC04 DA03 EB08 5G357 DA02 DA10 DB03 DC12 DD05 DD08 A08 DC05

Claims (5)

[Claims] A first small-diameter tubular portion into which a wire harness is closely fitted and inserted; a large-diameter tubular portion continuous with the first small-diameter tubular portion;
A vehicle body locking recess is provided on the outer peripheral surface of the enlarged diameter cylinder portion, a closing portion is provided on the large diameter end side of the enlarged diameter cylinder portion, and a second small diameter cylinder portion is continued from the center of the closed portion. A grommet, characterized in that one small-diameter tube portion, a large-diameter portion, and a second small-diameter tube portion are coaxially connected to each other, and one of the first small-diameter tube portion and the second small-diameter tube portion is used as a water stop portion. 2. The enlarged-diameter cylinder portion has a double cylinder structure of an inner cylinder and an outer cylinder, a space for sound insulation is provided inside, and the vehicle body locking recess is provided in the outer cylinder of the enlarged-diameter cylinder portion, and 2. The method according to claim 1, wherein the inner cylinder is continuous between the first small-diameter cylinder portion and the second small-diameter cylinder portion, and the inner cylinder and the outer cylinder are communicated with each other via a front end-side closing portion of the large-diameter cylinder portion. Grommet described. 3. The grommet according to claim 2, wherein a small-diameter pipe portion for inserting a cable or a hose projects from the outer cylinder of the large-diameter cylinder portion toward the first small-diameter cylinder portion. 4. A grommet according to claim 1, wherein a wire harness is inserted through the grommet, wherein one of the first small-diameter cylindrical portion and the second small-diameter cylindrical portion is stopped. On the side where the water section is provided, the distance between the center of the water stop section and the branch position of the wire harness extending from the tip of the small-diameter tubular section is equal to or larger than a set dimension, and the other side that is not the water stop section is the above-described side. Wire harness with grommet that is less than the set dimensions. 5. The wire harness with a grommet according to claim 2, wherein the set dimension is 100 mm.