JP2005001560A - Wire harness rooting structure between vehicle body and opening/closing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the bending resistance when opening/closing an opening/closing member of a wire harness rooted between a vehicle body and the opening/closing member. <P>SOLUTION: A wire harness 20 rooted between a vehicle body and an opening/closing member along a link mechanism 10 to connect the opening/closing member in a turnably opening/closing manner with respect to the vehicle body forms a return part 35 when the opening/closing member is in a fully closed state, and is supported by the link mechanism 10 toward the return part 35 with the angle α of 35-45° in the core direction at both ends of the return part 35. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a harness routing structure that electrically connects an opening / closing member such as a trunk lid of an automobile and the like to a vehicle body, and in particular, can improve the bending resistance of the harness when the opening / closing member is opened / closed. The present invention relates to a harness wiring structure between a vehicle body and an opening / closing member.
[0002]
[Prior art]
Conventionally, in order to electrically connect a vehicle body such as an automobile and an opening / closing member such as a back door or a trunk lid that moves relative to the vehicle body, a harness has been routed between the two. Yes. For example, a four-bar linkage mechanism is formed by the back door, the vehicle body, and the first and second links (arms) that connect the back door and the vehicle body, and the vehicle body side is located near one end of the second link. An opening is provided, a door side opening is provided in the back door in the vicinity of the other end, and a harness is inserted and routed through the main body side opening and the door side opening along the second link. A harness wiring structure in which a door is electrically connected is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Utility Model Registration No. 2574485 (page 2-3, Fig. 1)
[0004]
[Problems to be solved by the invention]
However, in the harness routing structure described in Patent Document 1, the harness routed along the second link when the back door is closed is folded back approximately 180 ° in the vicinity of the main body side opening. If the back door is opened and closed repeatedly, excessive bending stress will be applied to the bent part, and the harness may be disconnected internally or the bending resistance of the harness may be impaired. is there.
[0005]
The present invention has been made in view of such problems, and a vehicle body and an opening / closing member capable of improving the bending resistance when opening / closing the opening / closing member of a harness routed between the vehicle body and the opening / closing member. It aims at providing the harness wiring structure between.
[0006]
[Means for Solving the Problems]
In the harness routing structure between the vehicle body and the opening / closing member according to the present invention, the harness is routed between the vehicle body and the opening / closing member along a link mechanism that connects the opening / closing member to the vehicle body so that the opening / closing member can be rotated and opened. A harness routing structure, wherein the harness forms a folded portion when the opening and closing member is in a fully closed state, and the angle of the core line direction at both ends of the folded portion is 35 ° to 45 °. It is supported by the link mechanism so as to open toward.
[0007]
According to this invention, when the opening / closing member is in the fully closed state, the harness that forms the folded portion opens in the link mechanism so that the angle in the core line direction at both ends of the folded portion is 35 ° to 45 ° and opens toward the folded portion. Since it is supported, the folded portion of the harness is in a state of maintaining a curvature equal to or higher than a predetermined curvature even in the fully closed state. For this reason, even if the opening / closing operation of the opening / closing member is repeated, an excessive bending stress is not applied to the folded portion, and a problem that the harness is disconnected inside can be prevented. Thereby, it becomes possible to improve the bending resistance when opening and closing the opening and closing member of the harness routed between the opening and closing member and the vehicle body.
[0008]
As the link mechanism, for example, a first link fixed to the vehicle body, a second link fixed to the opening / closing member, a third link connecting the first and second links on one side, and the first and second links When a four-bar linkage mechanism is used that includes a fourth link that connects the first link to the other link and a plurality of connection pins that rotatably connect the first to fourth links, It is routed along the third link so that the first link and the third link are supported by the harness clips. For example, a grommet is fixed to the opening / closing member, and the harness routed along the first and third links is preferably routed inside the grommet. The end of the grommet on the link mechanism side extends in a direction toward the harness clip of the third link when the opening / closing member is fully open, and the harness clip of the third link is connected to the end of the grommet when the opening / closing member is fully open. What is necessary is just to make it support the said harness so that the angle of the core wire of the harness with respect to the extending direction may be opened toward the folded portion at 35 ° to 45 °. If the harness is routed in a non-fixed state inside the grommet, the restraint on the harness is reduced at the time of bending, and the bending stress is reduced, so that the bending resistance is further improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
1 and 2 are side views of a harness routing portion for explaining a harness routing structure between a trunk lid and a vehicle body according to an embodiment of the present invention. FIG. Reference numeral 2 denotes a case where the trunk lid is fully opened.
A vehicle body and a trunk lid (not shown) are connected via a four-bar linkage mechanism 10. The four-bar link mechanism 10 includes a first link 11 fixed to a vehicle body, a second link 12 fixed to a trunk lid as an opening / closing member, and the first and second links 11 and 12 on one side. A third link 13 to be connected, a fourth link 14 for connecting the first and second links 11 and 12 on the other side, and a connecting pin 15 for rotatably connecting the first link 11 to the fourth link 14. To 18. When the trunk lid is in the fully closed state, the four-joint link mechanism 10 makes the first link 11 and the second link 12 substantially parallel as shown in FIG. 1, and when the trunk lid is in the fully open state. As shown in FIG. 2, the trunk lid is supported so as to be capable of rotating and opening with respect to the vehicle body so that the second link 12 is in an approximately 90 ° state with respect to the first link 11.
[0010]
A wire harness 20 is routed along the first link 11 and the third link 13 of the four-joint link mechanism 10. The wire harness 20 is accommodated in a non-fixed state in a corrugated tube 21 as a protective member at least at a portion routed along the four-joint link mechanism 10. The wire harness 20 is supported on the first link 11 by the clips 22 and 23 via the corrugated tube 21, and is further supported by the clip 24 on the end of the third link 13 on the second link 12 side. Further, a grommet 30 is attached to a trunk lid (not shown) at a position slightly in front of the second link 12 in FIGS. The end 31 on the four-joint link mechanism 10 side of the grommet 30 extends in the direction toward the clip 24 of the third link 13 in the fully open state shown in FIG. 2 along the trunk lid. The wire harness 20 is routed so as to pass through the grommet 30 in an unfixed state.
[0011]
As shown in FIG. 1, in the fully closed state of the trunk lid, the wire harness 20 forms a folded portion 35, and the angle in the core direction at both ends of the folded portion 35, that is, the direction in which the end portion 31 of the grommet 30 extends. Is supported by the clip 24 so that the angle of the core wire of the wire harness 20 in the clip 24 opens toward the folded portion 35 with α. Thereby, the curvature radius R of the folding | returning part 35 is kept more than predetermined value. The radius of curvature R is 5.6 mm or more, and the angle α is in the range of 35 ° to 45 °. The reason will be described below.
[0012]
Figure 3 shows a high-speed switching test using an average wire harness, and the number of switchings at which the voltage drop of the wiring harness began to increase (becomes broken) was plotted on the vertical axis as the “number of fluctuations”. 6 is a graph in which the radius of curvature R of the wire harness is taken on the horizontal axis. The conventional average number of fluctuations was 41,000, and the curvature radius R at that time was 5.6 mm. In order for the number of fluctuations to exceed this, the radius of curvature R needs to be 5.6 mm or more.
[0013]
FIG. 4 is a graph showing the relationship between the angle α and the radius of curvature R in FIG. In order to obtain the curvature radius R = 5.6 mm, it was necessary to set the angle α to 35 °. If the angle α is further increased, the radius of curvature R increases. However, if the angle α is too large, the degree of bending of the wire harness 20 near the clip 24 becomes abrupt, and the probability that the wire harness 20 interferes with other members. Will also increase. Therefore, in consideration of these, it is desirable to set the angle α to 35 ° to 45 °.
[0014]
As described above, according to the wiring structure of the wire harness of the present embodiment, since the radius of curvature R of the folded portion 35 of the wire harness 20 can be increased, the bending resistance can be greatly improved.
Further, since the wire harness 20 is housed in a non-fixed state with respect to the corrugated tube 21 and the grommet 30, it can be freely moved during bending, and no additional bending stress is applied. Flexibility can be improved.
[0015]
In addition, this invention is not limited to embodiment mentioned above. In the above embodiment, the trunk lid is taken as an example of the opening / closing member, but the present invention can also be applied to a harness routing structure between another opening / closing member such as a back door or a side door and the vehicle body. In the above-described embodiment, the four-bar linkage mechanism is taken as an example of the link mechanism, but the present invention can also be applied to a harness routing structure along another link mechanism.
[0016]
【The invention's effect】
As described above, according to the present invention, when the opening / closing member is in the fully closed state, the harness that forms the folded portion has an angle in the core line direction at both ends of the folded portion of 35 ° to 45 ° toward the folded portion. Since it is supported by the link mechanism so as to open, the folded portion of the harness maintains a curvature that is equal to or greater than a predetermined curvature even in the fully closed state, and excessive bending stress is applied to the folded portion even when the opening / closing operation of the opening / closing member is repeated. It is not added, and the trouble that the harness is disconnected inside can be prevented. Thereby, the bending resistance at the time of opening / closing of the opening / closing member of the harness routed between the opening / closing member and the vehicle body can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a harness routing portion in a fully closed state of a trunk lid according to an embodiment of the present invention.
FIG. 2 is a side view of a harness wiring portion in a fully open state of the trunk lid according to the embodiment of the present invention.
FIG. 3 is a graph showing the relationship between the radius of curvature R of the folded portion of the harness and the number of opening / closing (number of fluctuations) at which the disconnection of the harness is started.
FIG. 4 is a graph showing the relationship between the radius of curvature R of the folded portion of the harness and the angle α at both ends of the folded portion.
[Explanation of Symbols] 10 ... 4 link mechanism, 11 ... 1st link, 12 ... 2nd link, 13 ... 3rd link, 14 ... 4th link, 15-18 ... connecting pin, 20 ... wire harness, 21 ... Corrugated tube, 22-24 ... clip, 30 ... grommet, 35 ... folded portion.

Claims (3)

A harness routing structure in which a harness is routed between the vehicle body and the opening / closing member along a link mechanism that connects the opening / closing member to the vehicle body so that the opening / closing member can be rotated and opened.
The harness is supported by the link mechanism so as to form a folded portion when the opening / closing member is in a fully closed state, and to open toward the folded portion when the core wire direction at both ends of the folded portion is 35 ° to 45 °. A harness routing structure between the vehicle body and the opening / closing member. The link mechanism includes a first link fixed to the vehicle body, a second link fixed to the opening / closing member, a third link connecting the first and second links on one side, and the first link And a fourth link for connecting the second link on the other side, and a plurality of connecting pins for rotatably connecting the first to fourth links,
The harness is routed along the first link and the third link and supported by the harness clip on the first link and the third link, respectively.
A grommet is fixed to the opening / closing member, and a harness routed along the first and third links is routed inside the grommet,
An end of the grommet on the link mechanism side extends in a direction toward the harness clip of the third link when the opening / closing member is in a fully open state,
The harness clip of the third link is configured such that the angle of the core wire of the harness with respect to the extending direction of the end portion of the grommet is 35 ° to 45 ° and opens toward the folded portion when the opening / closing member is in a fully closed state. The harness wiring structure between the vehicle body and the opening / closing member according to claim 1, wherein the harness is supported. 3. The harness routing structure between the vehicle body and the opening / closing member according to claim 2, wherein the harness is routed in an unfixed state inside the grommet.

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