JP5127048B2 - Wire harness surplus length absorption structure - Google Patents

Description

  The present invention relates to a surplus length absorbing structure for a wire harness configured by arranging a wire harness along a protector provided on a link for driving a luggage door of an automobile, for example.

  FIG. 3 shows one form of a conventional wire harness wiring structure (see Patent Document 1).

  In this structure, a wire harness (a plurality of electric wires) 21 is routed along two cage-like protectors 22 and 23 made of synthetic resin, which are rotatable members, and the protectors 22 and 23 are connected to each other. The wire harness 21 is bent freely in the opening and closing direction as shown by the arrows together with the protectors 22 and 23 around 24.

  That is, the wire harness 21 is inserted into both protectors, the wire harness 21 is fixed to one protector 23 with a tape winding 25, and a clip 26 for locking and rotating is projected from the other protector 22, and the clip 26 is The harness portion 21a, which is locked in the instrument panel (not shown) of the automobile, led out from one protector 23 to the outside, is connected to the meter unit (not shown) by a connector, and led out from the other protector 22 to the outside. The harness portion 21b is connected and fixed to the vehicle-side wire harness, and both the protectors 22 and 23 can be bent together with the wire harness 21 from the hinge 24 in the closing direction while the meter unit is assembled in the instrument panel.

  4 (a) and 4 (b) show another form of a conventional wire harness routing structure.

  In this structure, a wire harness (a plurality of electric wires) 7 is routed along metal links 1 and 2 that are two rotatable members, and shaft portions 8 and 9 connecting both links 1 and 2 are connected. The wire harness 7 can be bent in the opening and closing direction together with the two links 1 and 2 with the center at the center.

  That is, a synthetic resin rectangular cylindrical protector 14 is fixed along the first link 1, the wire harness 7 is inserted into the protector 14, and the wire harness 7 is tape-wrapped at both end portions 14 a and 14 b of the protector 14. 27, the harness fixing portion 13 is fixedly provided on the base 4 which is pivotally connected to the base end of the first link 1 by the shaft portion 9, and the harness portion 7 B led out from one end of the protector 14 is attached to the harness. The harness portion 7A fixed to the fixing portion 13 and led out from the other end of the protector 14 is clamped to the second link side (the member 15 (not shown connected to the second link 2 instead of the second link 2)). The wire harness 7 can be bent freely at both ends of the protector 14 as the two links 1 and 2 are opened and closed.

  The base end of the third link 3 is pivotally supported by the base (fourth link) 4 so as to be substantially parallel to the first link 1, and the tip ends of the first and third links 1, 3 are the first ones. A four-link mechanism is constituted by the links 1 to 4 that are pivotally supported by the base of the second link 2. A luggage door (not shown) is connected to the second link 2.

One harness portion 7B led out from the protector 14 is connected to a wire harness (not shown) on the vehicle body side through the harness fixing portion 13, and the other harness portion 7A is routed to the luggage door to be supplemented on the luggage door side. Supply power to the machine. 4A shows the fully closed state of the luggage door (or links 1 and 2), and FIG. 4B shows the fully opened state of the luggage door (or links 1 and 2). The luggage door is openably and closably provided at the front portion of the trunk room so as to accommodate an openable / closable roof (not shown) in a trunk room (not shown) at the rear of the automobile, for example. It is driven by means (not shown).
Japanese Unexamined Patent Publication No. 2000-209732 (FIGS. 2 to 4)

  However, in the conventional wiring harness routing structure of FIG. 4, the protector 14 (wire harness 7) is disposed above the shaft portions 8 and 9 at both ends of the first link 1 due to the mounting space. Therefore, when the link in FIG. 4A is fully closed, the harness fixing portion 12 on the second link side approaches the first link 1 so that the circle in FIG. With respect to the ideal harness shape 7a shown, the bent portion 7D of the wire harness 7 protrudes long in the extending direction of the first link 1, and this protruding portion (extra length portion) 7D interferes with other parts, or the protruding portion 7D. In this case, since the wire harness 7 is bent to a small diameter, there is a concern that the durability of the wire harness 7 may be deteriorated by repeated opening and closing operations of the link.

  4B, when the harness fixing portion 14b of the protector 14 of the first link 1 approaches the harness fixing portion 13 on the base side, the protector 14, the harness fixing portion 13 on the base side, Between the ideal harness shape 7b indicated by a chain line in the circle in FIG. 4B, the wire harness portion 7B is not slanted and is bent loosely downward, and this bent portion (extra length portion) ) There was a concern that 7B could interfere with other parts. Further, when the shape of the protector 14 is increased in order to avoid such interference, there is a concern that the protector 14 may interfere with other parts.

  In the present invention, in view of the above points, even when the protector is arranged above the shafts on both sides of the first link, the extra length of the wire harness does not occur at both ends of the protector when the link is opened and closed. It is an object of the present invention to provide a surplus length absorbing structure for a wire harness that can eliminate the concern about interference between the surplus length portion and other components and a decrease in durability of the wire harness.

In order to achieve the above object, a surplus length absorbing structure for a wire harness according to claim 1 of the present invention includes a first link that is pivotally supported by a base at a shaft portion, and the first link. A second link that is pivotally supported at the distal end side of the link by the shaft portion and opens at an acute angle with respect to the first link, and the second link from the center of each shaft portion . a harness protector disposed on said first link is offset in the opening direction, the wire harness which is slidably inserted into the harness protector, fixed base side of the harness fixing one of the wire harness And a second link side harness fixing part that fixes the other of the wire harness, and when the first and second links are closed, the base side harness fixing from the base end of the harness protector The length of the harness part to the part is long The length of the harness portion from the tip of the harness protector to the harness fixing portion on the second link side is defined to be short, and the first link rotates in the direction of the offset while the first link rotates. When the first and second links are opened, the length of the harness portion from the base end of the harness protector to the harness fixing portion on the base side is defined to be short, and the second link is extended from the tip of the harness protector. The length of the harness part to the harness fixing part on the side is defined to be long .

  With the above configuration, when the base is fixed to the vehicle body, which is a fixed structure, and the luggage door, which is a movable structure, is connected to the second link, the link is fully opened when the link shifts from fully closed to fully open. In other words, the first link pivots forward and the second link pivots rearward so that the opening angle of both links is large and the protector end and the harness fixing part on the base side As the distance between them is shortened, the extra length of the harness between one end of the protector and the harness fixing part on the base side enters the protector and slides in the protector while being absorbed. Derived from the end to the outside, the harness part between the other end of the protector and the harness fixing part on the second link side is lengthened, and between the other end of the protector and the harness fixing part on the second link side Distance It corresponds to an increase of.

  In addition, when the link shifts from fully open to fully closed, when the link is fully closed, that is, the first link and the second link rotate downward, and the opening angle of both links is small, As the distance between the other end of the protector and the harness fixing portion on the second link side is shortened, the extra harness portion between the other end of the protector and the harness fixing portion on the second link side is reduced. It slides in the protector while entering the protector and absorbed, and is led out from one end of the protector, and the harness part between the protector one end and the harness fixing part on the base side is lengthened, and one end of the protector This corresponds to an increase in the distance between the base and the harness fixing part on the base side.

  According to the first aspect of the present invention, even when the protector is arranged offset from the center of the shaft portion due to the mounting space, the harness surplus length between the protector and the harness fixing portion on the base side when the link is fully opened. Is absorbed, so that the conventional wire harness slack and the associated interference and damage concerns are eliminated, and when the link is fully closed, the harness extra length between the protector and the harness fixing part on the second link side is reduced. Absorption eliminates the concern of durability deterioration due to the protrusion of the bent part of the conventional wire harness and the accompanying interference, damage, and increased bending stress, as well as the protection of the wire harness by a hard protector. Power supply reliability is improved.

  1 to 2 show an embodiment of a surplus length absorbing structure for a wire harness according to the present invention.

  In this structure in which the wire harness is routed to the link for opening and closing the luggage door of the automobile in the conventional example of FIG. 4, the wire harness 7 is not fixed to the protector (harness protector) 6 disposed on the first link 1. The harness surplus length generated on one end side of the protector 6 when the link is opened and closed is released to the other end side of the protector 6, and the harness surplus length generated on the other end side of the protector 6 is It escapes to one end side of the protector 6 and smoothly absorbs the extra length.

  In FIG. 1, the same components as those in FIG. In FIG. 1, for the sake of convenience, the state when the link is fully opened and fully closed is shown at the same time. The wire harness 7 is formed by tape-wrapping a plurality of electric wires or covering them with a flexible protective tube or the like. The protector 6 is disposed so as to be offset upward from the centers of the shaft portions 8 and 9 at the front and rear ends of the first link 1.

  The protector 6 is formed in the shape of a rectangular cylinder using a synthetic resin as a material. The protector 6 does not have a harness fixing part on both sides, and includes a cover 6a that can be opened and closed and locked up and down and a protector body 6b. The protector is smoothly straight or almost straight without being caught. The bottom wall of the protector 6 is fixed to the upper surface of the first link 1 by a fixing means (not shown) such as a clip.

  The first link 1 is formed in an inverted L-shaped longitudinal section, the bottom wall of the protector 6 is fixed to the inclined upper wall (upper plate portion) 1a, and the longitudinal side walls (side plate portions) 1b are arranged at both longitudinal ends. Shaft portions 8 and 9 are provided, the shaft portion 9 on the proximal end side is rotatably supported on the rear half side of the vertical plate-like base 4, and the proximal end of the second link 2 is supported on the shaft portion 8 on the distal end side. The upper portion of the extension portion 5 on the side is rotatably supported. The extension 5 is a short link fixed to the second link 2 and is integrated with the second link 2. The second link 2 is also formed in an inverted L-shaped longitudinal section.

  The clamp that is the harness fixing portion 12 is connected to the vertical side plate portion 2 b of the second link 2 via a member 15 such as a bracket and moves integrally with the second link 2. The clamp 12 of this example includes a locking claw (clip) 12a inserted and locked in the hole of the member 15, and a band 12b wound and fixed on the upper portion 7a (7a ') of the wire harness 7. ing.

  The tip of the third link 3 is rotatably supported by the shaft portion 10 on the lower portion of the extension portion 5 of the second link 2, and the third link 3 is substantially parallel to the lower side of the first link 1. The base end of the third link 3 is rotatably supported on the front half side of the base 4 by the shaft portion 11. The third link 3 is formed in a longitudinal section L shape. A harness fixing portion 13 is fixed to the upper rear end of the base 4, and a lower portion 7 b (7 b ′) of the wire harness 7 is fixed to the harness fixing portion 13. The harness fixing portion 13 also serves as a fixed-side protector that inserts and protects the wire harness 7. In the present embodiment, the front-rear directionality is for convenience of explanation.

  When the link is fully closed in FIG. 1 (the lower diagram in FIG. 1), the first link 1 and the protector 6 are inclined forward and at a small angle, and the second link 2 intersects the first link 1. By tilting at a small angle substantially horizontally or slightly rearward together with the upper harness fixing part 12, the upper end 6c of the protector 6 is moved upward (second link) as compared to when the link is fully opened (upper view in FIG. 1). The vertical distance to the harness fixing portion 12 on the side) is shortened, and at the same time, the distance from the lower end 6d of the protector 6 to the harness fixing portion 13 on the lower side (base side) is increased.

  Accordingly, as shown in the lower (left) figure of FIG. 2, the length of the bent harness portion 7a ′ from the upper end 6c of the protector 6 to the upper harness fixing portion 12 is shortened, and the remaining is shortened. As shown by the hatching of the chain line, the harness portion 7b ′ from the lower end 6d of the protector 6 to the lower harness fixing portion 13 is slid downward in the protector 6 as indicated by the chain line hatching. It is absorbed by 'and increases the length of the lower harness portion 7b'.

  This eliminates a large forward protrusion of the bent harness portion 7A from the upper end of the protector 14 to the upper harness fixing portion 12 in FIG. 4 (a), and the harness portion 7a ′ (FIG. 2) and other components are eliminated. The harness portion 7a ′ is smoothly bent with a large radius, the bending stress of the bent portion 7d (FIG. 2) is reduced, and the durability of the wire harness 7 is improved.

  In addition, when the link of FIG. 1 is fully opened (upper view of FIG. 1), the first link 1 rotates forward with the protector 6 at a large angle, and the second link 2 moves with the upper harness fixing portion 12. By rotating the back up at a large angle, the distance from the lower end 6d of the protector 6 to the lower (base side) harness fixing portion 13 is larger than that when the link is fully closed (the lower side in FIG. 1). At the same time, the vertical distance from the upper end 6c of the protector 6 to the upper (second link side) harness fixing portion 12 is increased.

  Accordingly, the length of the substantially straight harness portion 7b from the lower end 6d of the protector 6 to the lower harness fixing portion 13 is shortened as shown in the upper (right) diagram of FIG. The harness portion (extra length portion) 7c slides upward in the protector as shown by the hatching of the chain line, and is absorbed by the harness portion 7a from the upper end 6c of the protector 6 to the upper harness fixing portion 12, and the upper portion The length of the harness portion 7a is increased.

  As a result, loosening of the harness portion 7B from the protector 14 to the lower harness fixing portion 13 in FIG. 4B in the prior art is prevented, and the concern about interference between the harness portion 7b (FIG. 2) and other parts is eliminated. Is done. Moreover, tension | pulling of the harness part 7a from the protector 6 to the upper harness fixing | fixed part 12 is prevented, and durability of the wire harness 7 increases.

  The middle diagram of FIG. 2 shows a state in the middle of opening and closing the link. The length of the harness portion 7b ″ from the lower end 6d of the protector 6 to the lower harness fixing portion 13 is the length of the harness portion 7b when fully opened. The length of the harness portion 7a ″ from the upper end 6c of the protector 6 to the upper harness fixing portion 12 is intermediate between the length and the length of the harness portion 7b ′ when fully closed. And the length of the harness portion 7a 'when fully closed. And the harness extra length part 7c '' is accommodated in the range of the length of the protector 7 substantially.

  Thus, according to the said embodiment, the protector 6 is arrange | positioned on the upper surface of the 1st link 1 on the relationship of attachment space, and the wire harness 7 passes the center of each axial part 8 and 9 of the 1st link 1. FIG. Even in such a state, the surplus length of the wire harness 7 that accompanies the opening and closing of the link can be absorbed smoothly to prevent interference of the wire harness 7 and to improve the bending durability of the wire harness 7.

  The harness surplus length absorbing structure described above can be applied not only to a luggage door of an automobile but also to various movable structures using a similar four-link mechanism. In this case, the vehicle body or the like that fixes the base 4 is referred to as a fixed structure. Moreover, it is also possible to apply the said harness surplus length absorption structure to the mechanism opened and closed using at least the 1st and 2nd links 1 and 2 instead of four links.

It is a front view which shows one Embodiment of the surplus length absorption structure of the wire harness which concerns on this invention in both the full open state and the fully closed state of a link. It is explanatory drawing which shows the effect | action of the wire harness which slides along a protector similarly with opening and closing of a link. It is a top view which shows one form of the wiring structure of the conventional wire harness. Another form of the conventional wiring structure of the wire harness is shown, (a) is a front view when the link is fully closed (inside circle is an explanatory diagram), (b) is a front view when the link is fully opened (inside the circle is an explanatory diagram) ).

Explanation of symbols

1 First link 2 Second link 4 Base 6 Protector (harness protector)
7 Wire harness 8, 9 Shaft part 12, 13 Harness fixing part

Claims (1)

A first link whose base end side is rotatably supported by the base at the shaft portion, and the base end side is rotatably supported by the shaft portion at the front end side of the first link. a second link that opens in an acute angle with respect to the harness protector disposed on said first link by the central offset in the opening direction of said second link of the shaft portions, in the harness protector comprising a slidably inserted through a wire harness, and the harness fixing portion of the base side with a fixed one of the wire harness, and a harness fixing portion of the second link-side fixed the other of the wire harness,
When the first and second links are closed, the length of the harness portion from the base end of the harness protector to the harness fixing portion on the base side is defined to be long, and from the tip of the harness protector to the second end When the length of the harness portion to the harness fixing portion on the link side is defined to be short, and the first and second links are opened while the first link rotates in the offset direction, the harness protector The length of the harness portion from the base end of the harness to the harness fixing portion on the base side is defined to be short, and the length of the harness portion from the tip of the harness protector to the harness fixing portion on the second link side is long A surplus length absorption structure of a wire harness characterized by being defined .

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