JPH09301098A - Door grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent disconnection in an electric wire housed in a tube part by preventing the bending of the tube part in opening or closing a door. SOLUTION: A door grommet 29 of flexible material has at its both ends fixed parts 31 and 33 which are fixed to electric wire led out ports 15a and 17a respectively provided in a door panel 15 and a body panel 17 of an automobile, a tube part 35 connecting the fixed parts 31 and 33 together, and an electric wire insertion hole 37 inside the tube part 35. The thickness of the tube part 35 is made thicker in the vicinity of the fixed parts 31 and 33 at both ends and thinner in its center portion to have a higher rigidity at its both ends and a lower rigidity at its center. As a result of which, the bending of the tube part 35 at its both ends is prevented in opening or closing the door to have a gentle, uniform flexure in its overall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for a door used for protecting electric wires routed between a door portion of an automobile or the like and a vehicle body portion.

[0002]

2. Description of the Related Art In recent years, as shown in FIG. 5, the window glass 3 of a door 1 of an automobile has been increasing in number of vehicles that employ a so-called power window which is opened and closed by an electric mechanism. An electric wire (a wire harness) 9 for the switch 5 and the switch 7 is provided between the vehicle body 11 and the door 1, the vehicle body 11 and the wire harness 9 wired between them to be elastically deformable for waterproofing and dustproofing. A grommet 13 made of a flexible material is provided.

As shown in FIGS. 6 and 7, the grommet 13 includes fixing portions 19 and 21 fixed to the wire outlets 15a and 17a of the door side panel 15 and the vehicle body side panel 17, respectively, and both fixing portions. An electric wire insertion hole 27, into which the electric wire 25 is inserted, is formed. Fixed part 1
9 and 21 are larger in diameter than the cylindrical portion 23, and annular fitting grooves 19a and 21a are formed on the outer peripheral portions thereof, and the electric wire outlet 15 of the door side panel 15 is fitted into the fitting grooves 19a and 21a.
a and the electric wire outlets 17a of the vehicle body side panel 17 are fitted respectively.

FIG. 6 shows a state in which the door 1 is opened,
At this time, the door side panel 15 and the vehicle body side panel 17 are substantially parallel to each other, and the tubular portion 23 maintains a linear state. On the other hand, in FIG. 7, the door 1 is closed, and at this time, the door side panel 15 and the vehicle body side panel 17 form an angle of approximately 90 degrees with each other, and the tubular portion 23 is bent.

[0005]

SUMMARY OF THE INVENTION Here, the grommet 1
Since the cylindrical portion 23 of No. 3 has a uniform wall thickness over the entire length, when a bending force is applied to the cylindrical portion 23 when the door 1 is closed, as shown in FIG. The wire 25 is bent, and the electric wire 25 in the grommet 13 is also bent accordingly. By repeating such bending, the electric wire 25 in the grommet may be broken.

When the tubular portion 23 of the grommet 13 is bent, it depends on the positions of the vehicle body, the door, the hinge and the grommet, but generally, the fixed portions 19 and 2 of the tubular portion 23 are fixed.
The largest bending moment is generated at the connection with 1.

Therefore, an object of the present invention is to prevent bending of the tubular portion when the door is opened and closed to prevent breakage of the electric wire housed inside.

[0008]

In order to achieve the above-mentioned object, the present invention has a fixing portion at both ends fixed to electric wire outlets provided on a door side panel and a vehicle body side panel of an automobile, respectively. A grommet for a door, which is made of a flexible material in which parts are connected by a tubular part and has an electric wire insertion hole inside, wherein the rigidity of the tubular part is high near both ends and low near the central part. Is.

According to the above construction, since the rigidity of both ends of the tubular portion which receives a large bending moment when the door is opened and closed is high, the bending at this portion is avoided and the entire tubular portion becomes gentle and uniform.

Further, by making the wall thickness of the tubular portion thick near both ends and thin near the central portion, the rigidity of the tubular portion becomes high near both ends and becomes low near the central portion, whereby the tubular portion is opened and closed when the door is opened and closed. Bending around both ends of the part is avoided, and the entire tubular part has a gentle and uniform bend.

Further, by changing the wall thickness of the tubular portion so that it gradually becomes thinner from both ends formed thicker toward the central portion, the rigidity of the tubular portion also gradually changes from both ends toward the central portion. , The bending of the cylinder when opening and closing the door is made more uniform.

Further, even if a bellows is provided on the tubular portion and the height of the bellows is low near both ends and high near the central portion, the rigidity of the tubular portion is high near both ends and low near the central portion. As a result, it becomes possible to make the bending of the cylinder part when opening and closing the door gentle and uniform.

[0013]

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

FIG. 1 shows a grommet 29 for a door according to an embodiment of the present invention, which is the grommet 1 shown in FIG.
Door side panel 15 and vehicle body side panel 17 in the same state as 3
It shows the state that it is installed between and.

The door grommet 29 is made of a flexible material like the above-mentioned conventional grommet 13, and is fitted into the wire outlet 15a of the door side panel 15 and the wire outlet 17a of the vehicle body side panel 17, respectively. Fixing portions 31 and 33 into which mating grooves 31a and 33a are fitted and fixed, respectively.
And a tubular portion 35 between the two fixing portions 31 and 33, and an electric wire insertion hole 37 into which the electric wire 25 is inserted.
Are formed.

Further, here, the wall thickness of the tubular portion 35 is thickest in the vicinity of both ends, thinnest in the central portion, and gradually changed from the thickened ends toward the central portion. As a result, the rigidity of the tubular portion 35 is high near both ends and low near the center.

FIG. 1 shows a state in which the door 1 is opened. When the door 1 is closed from this state, the tubular portion 35 bends as shown in FIG. Here, the largest bending moment acts on the body-side panel 17 side end), but since this end has a large thickness and high rigidity, it does not bend and the tubular portion 3
5 has a gentle and uniform bend as a whole. Moreover,
Since the wall thickness of the tubular portion 35 is gradually changed and the rigidity thereof is also gradually changed, the bending of the entire tubular portion 35 is extremely gentle and uniform. As a result, the grommet 29
The electric wire 25 inserted therein also bends gently without bending, and even if the door 1 is repeatedly opened and closed, disconnection of the electric wire 25 is avoided.

FIG. 3 shows a grommet 39 according to another embodiment of the present invention. This grommet 39
Is configured such that the tubular portion 41 includes a thick portion 41a near both ends having a large thickness and a thin portion 41b near a central portion having a small thickness, whereby the rigidity of the tubular portion 41 is increased near both ends. ,
It is designed to be low near the center.

In the grommet 39 shown in FIG. 3 as well, since the rigidity near the ends of the tubular portion 41 on which the largest bending moment acts when the door 1 is opened and closed is high, bending near the ends of the tubular portion 41 is avoided. It is possible to prevent disconnection of the electric wire inserted into the electric wire insertion hole 37.

FIG. 4 shows a grommet 43 according to still another embodiment of the present invention. In this grommet 43, a bellows 47 is provided on the tubular portion 45, and the height h of the peak of the bellows 47 is low near both ends and high near the center. As a result, the rigidity of the vicinity of both ends of the tubular portion 45 is increased, bending of the tubular portion 45 when the door 1 is opened and closed is avoided, and disconnection of the electric wire inserted into the electric wire insertion hole 49 can be prevented in advance. .

It should be noted that the shape of the bellows 47 is changed such that the interval between the peaks in the bellows 47 in FIG. 4 described above, that is, the pitch is increased at the central portion where the height h is high and is decreased at both ends where the height h is low. By adjusting the rigidity difference between both ends and the central portion of the tubular portion 45, the bending of the entire tubular portion 45 can be made gentler and more uniform. The adjustment of such a difference in rigidity is performed by the tubular portion 3 even in the configurations of FIGS. 1 and 3.
It is possible by adjusting the wall thickness of 5,41.

[0022]

As described above, according to the present invention, since the rigidity of both ends of the cylindrical portion which receives a large bending moment when the door is opened and closed is increased, the bending at this portion is avoided, and the cylindrical portion is prevented. As a whole, a gentle and uniform bend can be obtained, and the breakage of the electric wire can be prevented.

Further, since the wall thickness of the tubular portion is thick near both ends and thin near the central portion, the rigidity of the tubular portion is high near both ends and low near the central portion, whereby the tubular portion is opened and closed when the door is opened and closed. It is possible to avoid bending near both ends of the wire, and to obtain a gentle and uniform bend as a whole of the tubular portion, so that disconnection of the electric wire can be prevented.

Further, since the thickness of the tubular portion is changed so as to gradually decrease from the thickened ends toward the central portion, the bending of the tubular portion when opening and closing the door is made gentler and more uniform. Can be made.

Further, since the bellows is provided in the tubular portion and the height of the bellows is low near both ends and high near the central portion, the bending of the tubular portion when the door is opened and closed is gentle and uniform. It becomes possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a door grommet showing an embodiment of the present invention in a mounted state.

FIG. 2 is an operation explanatory view showing a state in which the grommet of FIG. 1 is bent when the door is closed.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention with a door grommet attached.

FIG. 4 is a sectional view of a door grommet in a mounted state showing still another embodiment of the present invention.

FIG. 5 is an explanatory view showing how the door grommet is attached to an automobile.

FIG. 6 is a cross-sectional view of a conventional door grommet in a mounted state.

FIG. 7 is an operation explanatory view showing a state in which the grommet of FIG. 6 is bent when the door is closed.

[Explanation of symbols]

 15 Door side panel 17 Vehicle body side panel 15a, 17a Electric wire outlet 29, 39, 43 Grommet 31, 33 Fixed portion 35, 41, 45 Tube portion 37, 49 Electric wire insertion hole 47 Bellows

Claims (4)

[Claims] 1. Fixing parts at both ends are fixed to electric wire outlets provided on a door side panel and a vehicle body side panel of an automobile, respectively, and the fixing parts are connected to each other by a tubular part to form an electric wire insertion hole inside. A door grommet made of a flexible material, wherein the rigidity of the tubular portion is high near both ends and low near the center. 2. The door grommet according to claim 1, wherein the wall thickness of the tubular portion is thicker near both ends and thinner near the central portion. 3. The door grommet according to claim 2, wherein the wall thickness of the tubular portion is changed so as to gradually become thinner from both ends formed to be thicker toward a central portion. 4. The door grommet according to claim 1, wherein a bellows is provided on the tubular portion, and the height of the bellows is low near both ends and high near the central portion.