JP3293550B2 - Grommet - Google Patents

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 wire harness routed to an automobile and is mounted in a through hole of a vehicle body panel. In a device provided with a through-hole through which a linear body such as a washer hose penetrates, the shape in the vicinity of the through-hole is improved to improve the mounting of the grommet on a vehicle body panel.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, when a wire harness W / H is routed continuously to an engine room X and a room Y of an automobile, a body panel 1 that separates the engine room and the room is provided. A through hole 1a is provided, and a grommet 2 made of rubber or elastomer is provided in the wire harness W / H.
And the grommet 2 is inserted into the through hole 1a of the vehicle body panel to achieve waterproofing, dustproofing, and the like. The grommet 2
A small-diameter cylindrical portion 2a that is brought into close contact with the wire harness W / H and a large-diameter cylindrical portion 2b that continues from one end of the small-diameter cylindrical portion 2a; Is recessed.

When a wire 3 such as a hood open wire or a washer hose is passed through the engine room X and the room Y and wired, the grommet 2 is used.
There is a case where an insertion hole 2d is provided in the enlarged diameter cylindrical portion 2b, and the linear body 3 penetrates the insertion hole 2d.

The grommet 2 shown in FIG. 5 and FIG.
A closing wall 2e is provided at the tip of the enlarged diameter cylindrical portion 2b, and the closing wall 2e is provided.
The wire body penetrates the wire harness W / H by projecting further from the center of the wire body and penetrates the wire harness W / H, and the wire body 2g for the wire body protrudes from the closing wall 2e to pass through the insertion hole 2d. 3 protrudes through the insertion tube portion 2g.

The grommet 2 has a wire harness W / H.
And when the linear body 3 is mounted and inserted through the through hole 1a of the vehicle body panel 1, as shown in FIG. Through the through-hole 1a, and when the enlarged-diameter tube portion 2b hits the through-hole 1a, pulls strongly with the enlarged-diameter tube portion 2b,
The enlarged diameter cylindrical portion 2b is bent to pass through the through hole 1a. The grommet 2 with the vehicle body locking groove 2c fitted to the periphery of the through hole 1a
Is stopped, and the grommet 2 is inserted into the vehicle body panel 1.

[0006]

When the linear body 3 is passed through the grommet 2, the insertion work becomes easier as the insertion hole 2d is larger. Therefore, as shown in FIGS. 5 and 6, an insertion hole 2d is provided which is largely cut from the distal end of the small-diameter cylindrical portion 2a to the enlarged-diameter cylindrical portion 2b, and as shown by an arrow in FIG. From the side, the linear body 3 is expanded with the expanded cylindrical portion 2b of the grommet 2.
And then project from the insertion tube 2g.

However, the above-described large insertion hole 2d
Is provided, a rib 2h is protruded from a portion of the insertion hole 2d that is continuous with the peripheral edge portion 2d-1 of the insertion hole 2d in order to maintain strength.
As shown in FIG. 7, when the grommet 2 is attached to the through-hole 1a and the operator pulls the grommet 2 by holding the both sides of the enlarged-diameter tube 2b after the small-diameter tube 2a has taken the through-hole 1a, the rib In addition to the presence of 2e, the enlarged diameter cylindrical portion 2b is flattened, and the arc-shaped tip peripheral edge portion 2d-1 of the insertion hole 2d cut into the enlarged diameter cylindrical portion 2b projects outward as shown in FIG. ,
A step L is generated. As described above, when the step L occurs on the outer peripheral surface of the enlarged-diameter cylindrical portion 2b, when the insertion operation into the through hole 1a is performed,
The arc-shaped tip peripheral edge portion 2d-1 is hooked on the peripheral edge of the through hole 1a. Therefore, as long as the hook is not removed, even if the small-diameter cylindrical portion 2a is pulled with a strong force, the grommet 2 will only crack. As described above, there has been a problem that the work of attaching the grommet to the vehicle body panel is extremely deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and the peripheral edge of an insertion hole for a linear body such as a bonnet open wire or a washer hose provided on a grommet is provided when the grommet is attached to a through hole of a vehicle body panel. It is an object of the present invention to make it possible to perform a mounting operation smoothly without being caught.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first small-diameter cylindrical portion integrally formed of rubber or an elastomer, and through which a wire harness is brought into close contact with the first small-diameter cylindrical portion. A diameter-enlarging tube portion that expands in a conical shape from one end, a closing portion on the other end side of the diameter-enlarging tube portion, and a second small-diameter tube portion that protrudes from a peripheral edge of a center hole of the closing portion. A grommet having a body engaging groove recessed on the outer periphery of the large diameter side of the diameter cylinder portion, and the first small diameter cylinder portion is pulled from the indoor side in a state where a wire harness is penetrated through the grommet, thereby forming a body panel of the automobile. An insertion hole for inserting a wire such as a wire or a tube from the first small-diameter cylindrical portion to the large-diameter side in the enlarged-diameter cylindrical portion; Is formed by cutting in the axial direction, and both ends of the insertion hole in the axial direction are formed. Provide a build-up guide portion that gradually increases in thickness from the small-diameter cylindrical portion side to the tip circular arc portion along the outer peripheral surface of the enlarged-diameter cylindrical portion at the maximum thickness portion at the tip of the build-up guide portion. When the vehicle body panel is inserted into the through hole, the overlaying guide portion is set so as to slide on the periphery of the through hole, and a hole is provided in the closing portion at a position corresponding to the insertion hole. The grommet is characterized in that an insertion tube portion protrudes from a peripheral edge of the grommet, and the linear body inserted through the insertion hole is drawn out through the insertion tube portion.

[0010] As described above, if a padding portion is provided at the periphery of the insertion hole through which a linear body such as a bonnet open wire or a washer hose is passed, an operator grips and pulls both sides of the enlarged-diameter tube portion. Sometimes, the enlarged diameter cylindrical portion is flattened and the arc-shaped distal end of the insertion hole projects, but since the build-up guide portion is continuous from both sides of the projected arc-shaped distal end, a step is formed in the enlarged diameter cylindrical portion. Do not generate. As a result, after passing through the through-hole of the vehicle body panel from the tip of the small-diameter cylindrical portion, when gripping the enlarged-diameter cylindrical portion and pulling the grommet, the overlaid portion slides in contact with the periphery of the through-hole of the vehicle body panel, The grommet can be smoothly attached to the vehicle body panel without being caught by a step as in the related art.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a grommet 10 according to an embodiment of the present invention. The grommet 10 is integrally formed of rubber or elastomer. The grommet 10 is
First small-diameter cylindrical portion 1 through which a wire harness is brought into close contact and penetrates
1, a large-diameter cylindrical portion 12 that expands conically from one end 11a of the first small-diameter cylindrical portion 11, a closing portion 13 on the other end side of the large-diameter cylindrical portion 12, and a central hole of the closing portion 13. Is provided with a second small-diameter cylindrical portion 14 protruding from the peripheral edge of. A vehicle body locking groove 15 is formed in a ring shape on the outer periphery of the large-diameter cylinder portion 12 on the large diameter side.

An insertion hole 1 for inserting a bonnet open wire 20 (hereinafter abbreviated as a wire) from the other end 11b of the first small-diameter cylindrical portion 11 to the large-diameter cylindrical portion 12.
6 is formed by cutting in the axial direction (the direction of arrow L in the figure). The insertion hole 16 is continuous with one end 11a of the first small-diameter cylindrical portion from both sides 16b and 16c in the circumferential direction of the circular arc portion 16a located at the enlarged-diameter cylindrical portion 12 along both peripheral edges 16d and 16e in the axial direction. To the side, build-up guide portions 17A and 17B (shown by oblique lines in the drawing) which become gradually thinner are provided.

As described above, the overlay guide portions 17A, 17
B has a thickness gradually increasing from the first small-diameter cylindrical portion 11 side, and is made to protrude so as to maximize the thickness of the distal end portion continuous with the distal end arc portion 16a and to be continuous on both circumferential sides of the distal end arc portion 16a. I have. Also, as shown in FIG. 1 and FIG.
6d and 16e are gradually thickened and projected from the circumferential direction. That is, the build-up guide portions 17A and 17B also protrude from the outer peripheral surface of the enlarged-diameter cylindrical portion 12 without generating a step.

The grommet 10 has a large-diameter cylindrical portion 12 and a rib 1 at a portion continuous with the circular arc portion 16a at the tip of the insertion hole 16.
2h is provided. Further, a hole is provided in the closing portion 13 at a position corresponding to the insertion hole 16, and the insertion cylindrical portion 19 is formed from the periphery of the hole.
The wire 20 inserted through the insertion hole 16 is passed through the insertion tube portion 19 and then drawn out.

The grommet 10 has a first small-diameter tube portion 11, an enlarged-diameter tube portion 12, and a second small-diameter tube 1 similar to the conventional example.
The wire harness W / H is made to penetrate through the continuous axial hollow portion of No. 4 and the tips of the first and second small-diameter cylindrical portions 11 and 14 are wound around the wire harness W / H with tapes 21 and 22 and fixed. Next, the wire 20 is inserted into the insertion hole 16, and is penetrated from the enlarged-diameter tube portion 12 through the insertion tube portion 19. Since the insertion hole 16 through which the wire 20 passes is located on the room Y side as shown in FIG. 4, there is no need to provide waterproofing. Therefore, the insertion hole 16 is not covered by wrapping tape or the like around the insertion hole. It is in a state of being left.

As shown in FIG. 4, the grommet 10 to which the wire harness W / H and the wire 20 are attached is pulled by the worker holding the wire harness W / H from the room Y side, and the vehicle body panel 1 is pulled out of the engine room X. The first small-diameter cylindrical portion 12 is passed through the through hole 1a. In this state, the room Y
The operator grasps the first small-diameter tube portion 12 on the side and strongly pulls the grommet 10 toward the room Y side.

At this time, as in the conventional case, the enlarged diameter cylindrical portion 12 is flattened and protrudes outward so that the arc-shaped portion 16a at the distal end of the insertion hole 16 is pushed out. However, since the build-up guide portions 17A and 17B are continuous on both sides in the circumferential direction of the protruding tip arc portion 16a, the step which has conventionally occurred does not occur, and the build-up guide portion is higher than the tip arc portion 16a. 17A and 17B smoothly continue to a continuous end 11a with the first small-diameter cylindrical portion 11.

When the operator grips the first small-diameter tube portion 11 from the room Y and pulls the grommet 10, the large-diameter tube portion 12 bends and passes while the outer peripheral surface slides against the peripheral edge of the through hole 1a. However, at that time, the overlay guide portions 17A, 17
B slides on the periphery of the through hole 1a. Since the tips of the built-up guide portions 17A and 17B are continuous with the tip circular arc portion 16a which is pushed out of the insertion hole 16 and protrudes outward, the penetrating smoothly expands the cylindrical portion 12 without being caught by the protruding distal arc portion 16a. It can be passed through the hole 1a.

The vehicle body engaging groove 15 of the enlarged diameter cylindrical portion 12 is
a, the enlarged diameter cylindrical portion 12 returns to its original shape, and the grommet 10 is held in a state where the vehicle body locking groove 15 is locked in the through hole 1a.
Is fixed to the vehicle body panel 1.

[0021]

As is apparent from the above description, according to the present invention, there is provided a wall on both sides in the axial direction of an insertion hole for penetrating a bonnet open wire or a washer hose provided in the enlarged-diameter cylindrical portion of the grommet. Because the protruding guide part is protruded, when gripping and pulling the enlarged diameter cylindrical part,
Even if the tip arc portion of the insertion hole is flat and protrudes outward,
The build-up guide portion does not continuously generate a step at the tip arc portion. Therefore, it is possible to solve the problem that the step was caught on the periphery of the through hole of the vehicle body panel and the grommet could not be easily passed through the through hole, which occurred conventionally.
The grommet can be attached to the through hole of the body panel with low pulling force.

[Brief description of the drawings]

FIG. 1 is a perspective view of a grommet of the present invention.

FIG. 2 is a sectional view taken along line II of FIG.

FIG. 3 is a front view of the grommet of FIG.

FIGS. 4A and 4B are views showing a mounting state of the grommet in a through hole of a vehicle body panel.

FIG. 5 is a perspective view showing a conventional grommet.

FIG. 6 is a front view showing a state where a conventional grommet is inserted into a through hole of a vehicle body panel.

FIG. 7 is a view showing a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body panel 1a Through-hole 10 Grommet 11 1st small diameter cylindrical part 12 Large diameter cylindrical part 13 Closed part 14 2nd small diameter cylindrical part 15 Body locking groove 16 Insertion hole 16a Tip arc part 17A, 17B Overlay guide part 20 Bonnet open wire

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 3/22 B60R 16/02 F16L 5/02 H01B 17/58

Claims (1)

(57) [Claims] 1. One-piece molding from rubber or elastomer
And the first small diameter for allowing the wire harness to come into close contact and penetrate
A cylindrical portion, and a conical expansion from one end of the first small-diameter cylindrical portion.
A diameter cylindrical portion, a closing portion on the other end side of the enlarged diameter cylindrical portion,
A second small-diameter cylindrical portion protruding from the periphery of the center hole;
Of the cylindrical partLarge diameter sideGrommets with recessed body locking grooves on the outer circumference
Consisting of a wire harness penetrated through the grommet.
In this state, pull the first small-diameter cylinder from the indoor side to automatically
Lock the above-mentioned body locking groove into the through hole of the car body panel and take it out.
A wire extending from the first small-diameter tube portion side to the large-diameter side portion on the large-diameter tube portion.
Alternatively, insert a through hole for inserting a linear body such as a tube.Axial direction
ToCut and formed,At both ends in the axial direction of the insertion hole
Along the small-diameter tube section to the tip arc section
An overlaid guide portion is provided, and the tip of the overlaid guide portion is provided.
In the maximum thickness part, the step between the outer peripheral surface of
When the vehicle body panel is inserted into the through hole,
Set so that the fillet guide part slides in, A hole is provided in the closing portion at a position corresponding to the insertion hole,
An insertion cylinder is projected from the periphery of the hole, and inserted through the insertion hole.
Configuration in which the above-mentioned linear body is drawn out through the insertion cylinder
And A grommet characterized by that.