JP3517053B2 - Wire harness slack absorbing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slack absorbing device for a wire harness, which is mainly used for absorbing a slack in a wire harness that connects a door of an automobile and a vehicle body.

[0002]

2. Description of the Related Art A wire harness is connected to an automobile door from the vehicle body side through a hinge portion of the door. In this case, an appropriate extra wiring length is provided in the connecting portion between the door side wire harness and the vehicle body side wire harness so as not to hinder the opening and closing of the door.

If this extra wiring length is left as it is, it will be loosened and hinder the opening / closing of the door, or it will be damaged by the opening / closing operation of the door. Therefore, conventionally, a grommet provided for waterproofing is used. The extra wiring length is accommodated inside and protected.

FIG. 4 shows an example described in Japanese Utility Model Publication No. 6-45869. In this example, one end 3a of the grommet 3 is fitted and fixed to an insertion hole provided in the front end wall 4 of the door 1, the wire harness 2 extended to the vehicle body side is surrounded by the grommet 3, and the other end 3b of the grommet 3 is fixed. It is fitted and fixed to the through hole on the vehicle body side.

There is also a device in which a device for absorbing extra connection length is provided at the exit of a wire harness for a door. Japanese Utility Model Laid-Open No. 5-64004 discloses several such examples. FIG. 5 shows an example thereof. The absorbing device 11 in (a) is a part of the door harness formed into an accordion shape, and the absorbing device 12 in (b) is a part of the door harness formed into a roll shape.

[0006]

By the way, when the wire harness between the door and the vehicle body is prevented from being loosened by the grommet as in the prior art, the work of fitting the grommet is difficult and the wiring work is extremely difficult. It was time-consuming. Further, when the absorber 11 formed in the accordion shape as shown in FIG. 5A is used, the conductor has to be bent, so that there is a problem in using it in a portion that is repeatedly bent. . Further, when the absorbing device 12 formed into a roll shape as shown in FIG. 5B is used, there is a problem in shape processing and shape retention, and there is a problem in long-term use.

In consideration of the above circumstances, the present invention can facilitate wiring work of a connecting portion between a door side wire harness and a vehicle body side wire harness without using a grommet, and has a simple structure for a long period of time. An object of the present invention is to provide a slack absorber for a wire harness that can withstand the use of a wire.

[0008]

According to a first aspect of the present invention, there is provided a substantially cylindrical case having a pair of outlets formed at opposing positions of a peripheral wall, and a disc rotatably housed inside the case. ,
A flat harness, which has a pair of rollers erected on a disc, is wound around the pair of rollers by being curved into an S shape in the longitudinal direction of the flat harness inside the case, and a flat wire extending from each roller. It is characterized in that both ends of the harness are led out from the respective outlets.

According to the first aspect of the present invention, when a tensile force is applied to both ends of the flat harness led out of the case, the flat harness wound around the pair of rollers in the S-shape inside the case is rotated to the disc. Acts, the disk rotates,
The flat harness is delivered to the outside without greatly degrading the shape of a certain S-shape. When the pulling force disappears, the flat harness tends to return to its original shape due to the curl of the flat harness inside the case, and the disc is rotated via the roller. Therefore, the flat harness inside the case is wound up without breaking the S-shape, and the flat harness fed out is taken inside the case. Therefore, the looseness of the flat harness outside the case is absorbed. Further, by winding the pair of rollers in an S-shape, the curved portion of the flat harness moves on the rollers, so that the stress due to the bending is dispersed without concentration and the occurrence of wire breakage is prevented.

According to a second aspect of the invention, there is provided a slack absorbing device for a wire harness according to the first aspect, which is disposed between a door side wire harness of an automobile and a vehicle body side wire harness and is led out from each of the outlets. Both ends of the flat harness are electrically connected to the door side wire harness and the vehicle body side wire harness, respectively.

According to the second aspect of the present invention, when the door is opened, the distance between the vehicle body side wire harness and the door side wire harness extends, and when the door is closed, the distance between the vehicle body side wire harness and the door side wire harness decreases. The expansion and contraction of the space can be absorbed by the flat harness wound in the S shape around the roller inside the case.

[0012]

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

FIG. 1 is a slack absorbing device 2 according to an embodiment of the present invention.
It is a schematic perspective view of the installation state of 0. This slack absorbing device 2
0 is disposed between the vehicle body 35 of the automobile and the opposing wall surface of the hinge portion of the door 36, and has a substantially cylindrical case 21 including a case body 22 and a lid 23.

FIG. 2A is an exploded perspective view of the case 21 and its internal elements. The case body 22 has a bottom wall 22a.
And a peripheral wall 22b having a substantially cylindrical shape, and the upper surface is open. The lid 23 closes the upper surface of the case body 22,
The case body 22 and the lid 23 are provided with a lock protrusion 41 and a lock recess 42 as shown in detail in FIG. 2B, and the lid 23 and the case body 22 can be mutually locked with the lid 23 closed. It is like this.

A pair of vertically elongated slot-shaped outlets 24, 25 are formed at the opposite positions of the peripheral wall 22b of the case body 22. A disc 27 is rotatably housed inside the case body 22. As shown in FIG. 2C, the circular plate 27 is mounted on the bottom plate 22a of the case body 22 via the convex portion 27a protruding from the lower surface so that it can rotate along the inner peripheral surface of the peripheral wall 22b. It has become. Further, grease 50 or the like is applied to the sliding portion of the disc 27 to facilitate rotation.

The disk 27 has a pair of pins 28, 28.
The discs 27 are projected upward in parallel at a position facing each other with the center of rotation of the disc 27 interposed therebetween. These pins 28,
A roller 29 having a central hole 29a is rotatably fitted in each of 28. Then, as shown in FIG. 1, the flat harness 30 is wound around the pair of rollers 29, 29 by being curved into an S shape in the longitudinal direction of the flat harness 30 inside itself, and each roller 29,
Both ends 30a of the flat harness 30 extending from 29,
30b are led out from the outlets 24 and 25, respectively.

In this case, the flat harness 30 is configured as a part of the wire harness on the door 36 side, and a part of the portion extending outside the door 36 is accommodated in the case 21 and extends from the case 21. Connector 3
A wire harness (not shown) on the vehicle body side is connected via 7. The flat harness (also referred to as "flat cable") 30 is a unit in which conductors arranged in parallel are sandwiched by insulating sheets from the front and back sides and integrated, and has a waterproof property, and stands substantially vertically. It is arranged in a posture.

Next, the operation will be described.

As shown in FIG. 3A, the door 36 is closed (P1) and opened (P2). In the state where the door 36 is closed, the space between the vehicle body side wire harness and the door side wire harness is shortened, so that the state shown in FIG. 3B is obtained. That is, since almost no tensile force acts on the flat harness 30, the flat harness 30 maintains its initial form due to the winding tendency of the flat harness 30 inside the case 21.

When the door 36 is opened from this state, the space between the vehicle body side wire harness and the door side wire harness is extended, and the state is as shown in FIG. 3 (c). That is,
A tensile force as indicated by an arrow acts on both ends 30a, 30b of the flat harness 30, and the tensile force causes a rotational force to act on the disc 27 via the pair of rollers 29, 29 inside the case 21, so that the disc 27 is As the flat harness 30 rotates, the flat harness 30 is delivered to the outside without greatly degrading the shape of the constant S-shape. Therefore, by extending the extra length of the flat harness 30, the door 36 can be opened so that an excessive force does not act on the wire harness.

When the door 36 is closed from this state,
Since the flat harness 30 has no tension,
Due to the curl of the flat harness 30 inside the case 21, as shown in FIG. 3B, the flat harness 30 tries to return to its original form, and the disc 27 is rotated via the roller 29. In this way, the flat harness 30 inside the case 21 is wound up without losing the S-shape, and thus the flat harness 3 is fed out.
0 is taken into the case 21, and the slack of the flat harness 30 outside the case 21 is absorbed.

As described above, when the vehicle side wire harness and the door side wire harness are connected by using the device 20, the flat harness 30 itself is waterproof and the slack of the flat harness 30 is Since it is absorbed by the internal mechanism, it is possible to eliminate the grommet conventionally provided for ensuring waterproofness and preventing loosening.

Further, in the inside of the case 21, by using the two rollers 29, 29, the flat harness 30 can be wound and unwound without breaking the S-shape. The shape of the harness 30 can be kept constant for a long period of time,
Performance degradation can be minimized. Also, for example, in the case of a conventional roll shape, considering the pulling force,
Although it is necessary to prepare a harness of a considerably long length, in the case of this device 20, since the excess length is absorbed by the rollers 29, 29, it is not necessary to take a long length, and the bending rate is set to a large value. It can be done and processing becomes easy.

In the above embodiment, the slack absorbing device 2
Although 0 is arranged between the door 36 and the vehicle body 35, it may be installed inside the frame of the door 36.

[0025]

As described above, according to the first aspect of the invention, the flat harness having waterproofness is used as the wire harness, and the slack of the flat harness is absorbed by the mechanism inside the case. Therefore, the grommet provided for ensuring waterproofness and preventing loosening can be eliminated. Therefore, the wiring work can be simplified by the labor saving work of fitting the grommet. In addition, since the flat harness is wound inside the case without breaking the S-shape by using two rollers, the shape of the flat harness can be kept constant for a long period of time. Performance degradation can be minimized.

According to the second aspect of the present invention, the slack of the wire harness between the door of the automobile and the vehicle body can be absorbed by the flat harness wound in the S-shape on the roller inside the case. Therefore, the grommet provided at the hinge portion of the door can be eliminated, and the wiring work at that portion can be facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a slack absorber for a wire harness according to an embodiment of the present invention with a lid removed.

2A and 2B show a main configuration of a slack absorbing device for a wire harness according to an embodiment of the present invention, FIG. 2A is an exploded perspective view of a case and internal parts thereof, and FIG. An enlarged perspective view, (c) is a cross-sectional view showing the relationship between the lower surface of the outer peripheral portion of the disc and the inner bottom portion of the case body.

3A and 3B are operation explanatory views of the slack absorbing device for the wire harness according to the embodiment of the present invention, FIG. 3A is a partial plan view of the vehicle for explaining an opening / closing operation of an automobile door, and FIG. FIG. 6C is a plan view showing a state of internal elements of the slack absorbing device when the door is open, and FIG. 7C is a plan view showing a state of internal elements of the slack absorbing device when the door is opened.

FIG. 4 is a perspective view showing a conventional wire harness structure of a door portion of an automobile.

FIG. 5 is a perspective view showing an example of a conventional slack absorbing device, in which (a) is an accordion-shaped device and (b) is a roll-shaped device.

[Explanation of symbols]

20 Slack absorber 21 cases 22b peripheral wall 24,25 outlet 27 discs 29 Laura 30 flat harness 30a, 30b ends 35 car body 36 doors

Continuation of front page (51) Int.Cl. ⁷ identification code FI H05K 7/00 H05K 7/00 B (56) Reference JP-A-7-218733 (JP, A) Actual development Sho 62-64911 (JP, U ) Actually open 62-96209 (JP, U) Actually flat 6-29185 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01B 7/06 B60R 16/02 620 H01B 7 / 00 301 H02G 3/04 H05K 7/00

Claims (2)

(57) [Claims] 1. A substantially cylindrical case having a pair of outlets formed at opposed positions of a peripheral wall, a disc rotatably housed in the case, and a pair of rollers erected on the disc. And a flat harness that is wound around the pair of rollers by being curved into an S shape in the longitudinal direction of the flat harness inside the case, and both ends of the flat harness extending from the rollers are respectively separated from the outlets. A slack absorbing device for a wire harness, which is drawn out to the outside. 2. The slack absorbing device for a wire harness according to claim 1, wherein the flat harness is arranged between a door side wire harness of an automobile and a vehicle body side wire harness and is drawn out from each of the outlets. A slack absorbing device for a wire harness, wherein both ends are electrically connected to the door side wire harness and the vehicle body side wire harness, respectively.