Wire harness

Abstract

To provide a wire harness enabling suppression of damage of an electric wire member due to torsion caused by opening / closing of an opening / closing body.SOLUTION: A wire harness includes a grommet 20 and an electric wire member 30 passed through the grommet 20. The grommet 20 holds the electric wire member 30 so that when the twist angle θ of the electric wire member 30 is a positive value when the opening / closing body is at the fully opened position, the twist angle θ becomes 0 degrees when an opening / closing body is at an intermediate position between the fully opened position and a fully closed position, and the twist angle θ becomes a negative value when the opening / closing body is at the fully closed position.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a wire harness. [Background technology]

[0002] For example, a vehicle wire harness described in Patent Document 1 includes an electric wire member routed between the vehicle body side and an opening / closing body side such as a door, and a grommet through which the electric wire member is passed. The grommet is disposed between the vehicle body and the opening / closing body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-111258 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described wire harness, twisting may occur in the electric wire members when the opening / closing body is opened or closed. An object of the present disclosure is to provide a wire harness that can suppress damage to electric wire members due to twisting that occurs when an opening / closing body is opened or closed. [Means for solving the problem]

[0005] The wire harness of the present disclosure is a wire harness that is attached to an attachment target and includes a fixed portion and an opening / closing body that is opened and closed relative to the fixed portion between a fully open position and a fully closed position, and includes an electric wire member that is arranged between the fixed portion and the opening / closing body, and the electric wire member is routed between the fixed portion and the opening / closing body, and enters the interior of the fixed portion through a through hole formed in the mounting surface of the fixed portion, and enters the interior of the opening / closing body through a through hole formed in the mounting surface of the opening / closing body, and the electric wire member is fixed to the through hole of the fixed portion so that when the twist angle of the electric wire member is a positive value when the opening / closing body is in the fully open position, the twist angle is 0 degrees when the opening / closing body is in an intermediate position between the fully open position and the fully closed position, and the twist angle is a negative value when the opening / closing body is in the fully closed position. [Effects of the Invention]

[0006] The wire harness of the present disclosure exhibits the effect of being able to suppress damage to the electric wire members due to twisting that occurs when the opening / closing body is opened or closed. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing a mounting target to which a wire harness is attached. [Figure 2] FIG. 2 is a plan view of the wire harness according to the embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a schematic perspective view for explaining the movement of the wire harness accompanying the opening and closing of the opening and closing body. [Figure 5] FIG. 5 is an explanatory diagram for explaining twisting of the electric wire member caused by opening and closing of the opening and closing body. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. The wire harness of the present disclosure includes: [1] A wire harness to be attached to an object to be attached, the wire harness having a fixed portion and an opening / closing body that opens and closes relative to the fixed portion between a fully open position and a fully closed position, the wire harness comprising: a grommet arranged between the fixed portion and the opening / closing body; and an electric wire member passed through the grommet, the grommet having a fixed side end fixed to the fixed portion and a movable side end fixed to the opening / closing body, the electric wire member being routed between the fixed portion and the opening / closing body while passing through the inside of the grommet, the grommet holding the electric wire member such that, when the twist angle of the electric wire member when the opening / closing body is in the fully open position is a positive value, the twist angle is 0 degrees when the opening / closing body is in an intermediate position between the fully open position and the fully closed position, and the twist angle is a negative value when the opening / closing body is in the fully closed position.

[0009] According to this configuration, when the opening / closing body is in the intermediate position, the wire member is in a neutral state without twist. The wire member can be configured to twist in opposite directions between the fully open position and the fully closed position. Therefore, compared to a configuration in which the wire member is configured to be in a neutral state when the opening / closing body is in the fully open position or the fully closed position, it is possible to reduce the amount of twist in the wire member that occurs when the opening / closing body is opened or closed. As a result, it is possible to prevent damage to the wire member due to twisting that occurs when the opening / closing body is opened or closed.

[0010] [2] In the above [1], the absolute value of the torsion angle when the opening / closing body is in the fully open position may be equal to the absolute value of the torsion angle when the opening / closing body is in the fully closed position.

[0011] This configuration makes it possible to make the amount of twist in the electric wire member equal between the fully open position and the fully closed position, thereby minimizing the amount of twist in the electric wire member that occurs when the opening / closing body is opened or closed.

[0012] [3] In the above [1] or [2], the intermediate position may be a position that is midway between the fully open position and the fully closed position. This configuration makes it possible to make the amount of twist in the electric wire member equal between the fully open position and the fully closed position, thereby minimizing the amount of twist in the electric wire member that occurs when the opening / closing body is opened or closed.

[0013] [4] In any of [1] to [3] above, when a first imaginary line is a line connecting the center of the movable side end and the center of the fixed side end when the opening / closing body is in the fully open position, a second imaginary line is a line connecting the center of the movable side end and the center of the fixed side end when the opening / closing body is in the fully closed position, and a third imaginary line is a line connecting the center of the movable side end and the center of the fixed side end when the opening / closing body is in the intermediate position, the third imaginary line may be set at a position that bisects the angle formed by the first imaginary line and the second imaginary line.

[0014] This configuration makes it possible to make the amount of twist in the electric wire member equal between the fully open position and the fully closed position, thereby minimizing the amount of twist in the electric wire member that occurs when the opening / closing body is opened or closed.

[0015] [5] In any one of the above [1] to [4], the electric wire member may include a braided member. According to this configuration, the wire member includes a braided member that is easily damaged by twisting, and therefore, it is possible to obtain a more significant damage suppression effect by keeping the amount of twisting of the wire member small.

[0016] [Details of the embodiments of the present disclosure] Specific examples of wire harnesses according to the present disclosure will be described below with reference to the drawings. In each drawing, some of the components may be exaggerated or simplified for ease of explanation. The dimensional ratios of each part may differ from one drawing to another. Note that the term "cylindrical" used in the description of this specification includes not only those having a continuous peripheral wall formed around the entire circumference, but also those formed by combining multiple parts and those having a notch in a circumferential direction, such as a C-shape. The term "cylindrical" also includes circular, elliptical, and polygonal shapes with pointed or rounded corners.

[0017] As shown in FIG. 1 , a wire harness 10 of this embodiment is attached to an attachment target 11. The attachment target 11 includes a fixed portion 12 and an opening / closing body 13 supported by the fixed portion 12. The opening / closing body 13 is configured to be openable and closable relative to the fixed portion 12 between a fully open position Po and a fully closed position Pc. The attachment target 11 is, for example, a vehicle. The fixed portion 12 is, for example, a vehicle body. The opening / closing body 13 is, for example, a back door, a side door, a sliding door, an opening / closing body of a sunroof device, a side mirror, a room mirror, or the like of the vehicle.

[0018] The opening / closing body 13 is connected to the fixed portion 12 via, for example, a hinge shaft 14. The opening / closing body 13 is configured to be rotatable between a fully open position Po and a fully closed position Pc with the hinge shaft 14 as a rotation axis.

[0019] (Configuration of wire harness 10) The wire harness 10 includes a grommet 20 and an electric wire member 30. The grommet 20 is made of a flexible material. For example, rubber, elastomer, or the like can be used as the material for forming the grommet 20.

[0020] The grommet 20 is provided between the fixed part 12 and the opening / closing body 13. The grommet 20 is provided, for example, near the hinge shaft 14. The grommet 20 has a cylindrical shape as a whole. An electric wire member 30 is passed through the grommet 20. The electric wire member 30 is routed between the fixed part 12 and the opening / closing body 13 while passing through the inside of the grommet 20. One end of the electric wire member 30 is connected to a device (not shown) provided in the opening / closing body 13.

[0021] As shown in Fig. 5, the electric wire member 30 is, for example, an LVDS cable having an electric wire 31 and a braided member 32 covering the outer periphery of the electric wire 31. The electric wire 31 is a single electric wire having a core wire and an insulating coating, or a bundle of multiple electric wires. The braided member 32 is formed, for example, by braiding multiple metal wires. The braided member 32 magnetically shields the electric wire 31.

[0022] (Grommet 20 configuration) 2 and 3, the grommet 20 has a fixed end portion 21, a movable end portion 22, and an intermediate portion 23. The fixed end portion 21 is provided at one end of the grommet 20 in the longitudinal direction. The movable end portion 22 is provided at the other end of the grommet 20 in the longitudinal direction. The intermediate portion 23 is a portion that connects the fixed end portion 21 and the movable end portion 22. Each of the fixed end portion 21 and the movable end portion 22 extends radially from the intermediate portion 23, for example, in a flange-like shape. The electric wire member 30 passes through the fixed end portion 21, the intermediate portion 23, and the movable end portion 22 of the grommet 20.

[0023] 3, the grommet 20 has a fixing piece 24 to which the electric wire member 30 is fixed. The fixing piece 24 is provided, for example, at the fixed-side end portion 21. The electric wire member 30 is fixed to the fixing piece 24 by, for example, an adhesive tape 25.

[0024] The intermediate portion 23 has a bellows portion 26 in at least a portion in the longitudinal direction. The bellows portion 26 has a bellows shape in which the diameters alternate between large and small in the longitudinal direction. That is, the bellows portion 26 has a structure in which large diameter portions 26a and small diameter portions 26b are alternately provided in a series along the longitudinal direction. Note that, for the sake of convenience, the detailed shape of the bellows portion 26 is not shown in FIG. 4.

[0025] 4, the fixed end portion 21 is fixed to the mounting surface 12a of the fixed portion 12. The movable end portion 22 is fixed to the mounting surface 13a of the opening / closing body 13. As shown in FIG. 3, the fixed end portion 21 includes a lip portion 21a that is in close contact with the mounting surface 12a. The lip portion 21a is annular. The lip portion 21a is in close contact with the mounting surface 12a at a position that surrounds a through-hole (not shown) formed in the mounting surface 12a. This allows the lip portion 21a to seal the through-hole. Note that a center C1 of the fixed end portion 21, which will be described later, coincides with the center of the annular lip portion 21a. The electric wire member 30 enters the interior of the fixed part 12 through the through-hole in the mounting surface 12a.

[0026] The movable end portion 22 has a lip portion 22a that fits tightly against the mounting surface 13a. The lip portion 22a is annular. The lip portion 22a fits tightly against the mounting surface 13a at a position that surrounds a through-hole (not shown) formed in the mounting surface 13a. This allows the lip portion 22a to seal the through-hole. Note that a center C2 of the movable end portion 22, which will be described later, coincides with the center of the annular lip portion 22a. The electric wire member 30 enters the interior of the opening / closing body 13 through the through-hole in the mounting surface 13a.

[0027] (Regarding twisting caused by opening and closing the opening / closing body 13) 4, the mounting surface 13a of the opening / closing body 13 and the movable end portion 22 of the grommet 20 are displaced as the opening / closing body 13 is opened or closed. The movable end portion 22 is displaced relative to the fixed end portion 21, which does not displace when the opening / closing body 13 is opened or closed, causing a twist in the middle portion 23 of the grommet 20 and the electric wire member 30 inside the grommet 20. The "twist" of the grommet 20 and the electric wire member 30 refers to deformation when rotated in a plane perpendicular to the longitudinal direction.

[0028] 3, in the electric wire member 30, a portion located inside the fixed end portion 21 of the grommet 20 is referred to as a first portion 30a, and a portion located inside the movable end portion 22 is referred to as a second portion 30b. In the following description, the twist angle θ of the electric wire member 30 refers to the angle of twist of the second portion 30b with respect to the first portion 30a.

[0029] As shown in Fig. 5, when the opening-closing body 13 is in an intermediate position Pm between the fully open position Po and the fully closed position Pc, the twist angle θ of the electric wire member 30 is 0°. That is, at the intermediate position Pm, no twist occurs in the electric wire member 30. When the opening-closing body 13 is in the fully open position Po, the twist angle θ is a positive value, and when the opening-closing body 13 is in the fully closed position Pc, the twist angle θ is a negative value. That is, the second portion 30b of the electric wire member 30 is twisted in opposite directions at the fully open position Po and the fully closed position Pc.

[0030] As shown in FIG. 4, the center C2 of the movable end portion 22 when the opening-closing body 13 is in the fully open position Po is referred to as the open center C2a. The center C2 of the movable end portion 22 when the opening-closing body 13 is in the fully closed position Pc is referred to as the closed center C2b. The center C2 of the movable end portion 22 when the opening-closing body 13 is in the intermediate position Pm is referred to as the intermediate center C2c. The line connecting the center C1 of the fixed end portion 21 and the open center C2a of the movable end portion 22 is referred to as the first imaginary line L1. The line connecting the center C1 of the fixed end portion 21 and the closed center C2b of the movable end portion 22 is referred to as the second imaginary line L2. The first imaginary line L1 and the second imaginary line L2 are set to be equal in length. That is, a triangle with the center C1 of the fixed end portion 21, the open center C2a, and the closed center C2b as its vertices forms an isosceles triangle.

[0031] Here, for example, the intermediate position Pm of the opening-closing body 13 is a position that is centered between the fully open position Po and the fully closed position Pc. That is, the amount of movement of the opening-closing body 13 from the intermediate position Pm to the fully open position Po is equal to the amount of movement from the intermediate position Pm to the fully closed position Pc. Therefore, when a line connecting the center C1 of the fixed-side end portion 21 and the intermediate center C2c of the movable-side end portion 22 is defined as a third imaginary line L3, the third imaginary line L3 bisects the angle θ1 formed by the first imaginary line L1 and the second imaginary line L2. As a result, the absolute value |α| of the torsion angle θ when the opening-closing body 13 is in the fully open position Po is equal to the absolute value |α| of the torsion angle θ when the opening-closing body 13 is in the fully closed position Pc. That is, the electric wire member 30 is twisted by the same amount at the fully open position Po and the fully closed position Pc.

[0032] As shown in Figure 3, the central axis L4 of the fixed end 21 of the grommet 20 is perpendicular to the seating surface 21b of the fixed end 21 and passes through the center C1 of the fixed end 21. The angle formed between the central axis L4 and an axis CL along the length direction of the intermediate portion 23 is defined as a first turret angle θ2. The central axis L5 of the movable end 22 is perpendicular to the seating surface 22b of the movable end 22 and passes through the center C2 of the movable end 22. The angle formed between the axis CL of the intermediate portion 23 and the central axis L5 is defined as a second turret angle θ3.

[0033] 2 is the angle of the fixed end 21 relative to the axis CL. The rotation angle θ4 is the angle in the rotation direction around the central axis L4 of the fixed end 21. The movable end 22 also has a rotation angle similar to the rotation angle θ4.

[0034] The first turret angle θ2 of the fixed-side end portion 21, the rotation angle θ4 of the fixed-side end portion 21, the second turret angle θ3 of the movable-side end portion 22, and the rotation angle of the movable-side end portion 22 are set so that the intermediate portion 23 does not interfere with the fixed portion 12 and the opening / closing body 13 when assembled to the attachment object 11. Furthermore, the first turret angle θ2 of the fixed-side end portion 21, the rotation angle θ4 of the fixed-side end portion 21, the second turret angle θ3 of the movable-side end portion 22, and the rotation angle of the movable-side end portion 22 are set so that the intermediate portion 23 does not interfere with the electric wire member 30 when the opening / closing body 13 is opened or closed, and stress does not concentrate locally on the electric wire member 30.

[0035] The effects of this embodiment will be described. (1) The grommet 20 holds the wire member 30 so that the twist angle θ is 0 degrees when the opening-closing body 13 is at an intermediate position Pm between the fully open position Po and the fully closed position Pc. According to this configuration, the wire member 30 is in a neutral state with no twist when the opening-closing body 13 is at the intermediate position Pm. The wire member 30 can be configured to twist in opposite directions between the fully open position Po and the fully closed position Pc. Therefore, compared to a configuration in which the wire member 30 is configured to be in a neutral state when the opening-closing body 13 is at the fully open position Po or the fully closed position Pc, it is possible to minimize the amount of twist of the wire member 30 that occurs when the opening-closing body 13 is opened or closed. As a result, damage to the wire member 30 due to twisting that occurs when the opening-closing body 13 is opened or closed can be reduced.

[0036] (2) The absolute value of the twist angle θ when the opening-closing body 13 is in the fully open position Po is equal to the absolute value of the twist angle θ when the opening-closing body 13 is in the fully closed position Pc. With this configuration, it is possible to make the amount of twist of the electric wire member 30 equal between the fully open position Po and the fully closed position Pc. Therefore, it is possible to minimize the amount of twist of the electric wire member 30 that occurs when the opening-closing body 13 is opened or closed.

[0037] (3) The intermediate position Pm is a position that is midway between the fully open position Po and the fully closed position Pc. With this configuration, it is possible to make the amount of twist of the electric wire member 30 equal between the fully open position Po and the fully closed position Pc. Therefore, it is possible to minimize the amount of twist of the electric wire member 30 that occurs when the opening / closing body 13 is opened or closed.

[0038] (4) A first imaginary line L1 is a line connecting the center C2 of the movable end 22 and the center C1 of the fixed end 21 when the opening-closing body 13 is in the fully open position Po. A second imaginary line L2 is a line connecting the center C2 of the movable end 22 and the center C1 of the fixed end 21 when the opening-closing body 13 is in the fully closed position Pc. A third imaginary line L3 is a line connecting the center C2 of the movable end 22 and the center C1 of the fixed end 21 when the opening-closing body 13 is in the intermediate position Pm. The third imaginary line L3 is set at a position that bisects the angle θ1 formed by the first imaginary line L1 and the second imaginary line L2. This configuration makes it possible to make the amount of twist of the electric wire member 30 equal at the fully open position Po and the fully closed position Pc. Therefore, it is possible to minimize the amount of twist of the electric wire member 30 caused by opening and closing the opening-closing body 13.

[0039] (5) The electric wire member 30 includes the braided member 32, which is easily damaged by twisting. Therefore, it is possible to obtain a more significant damage suppression effect by minimizing the amount of twisting of the electric wire member 30. Furthermore, the electric wire member 30 includes a braided wire included in the LVDS cable of the electric wire 31. Similar to the braided member 32, the braided wire is also easily damaged by twisting, so it is possible to obtain a more significant damage suppression effect.

[0040] (Example of change) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0041] The third imaginary line L3 may be set at a position that does not bisect the angle θ1 formed by the first imaginary line L1 and the second imaginary line L2. The intermediate position Pm does not have to be the center position between the fully open position Po and the fully closed position Pc.

[0042] The absolute value of the twist angle θ when the opening-closing body 13 is in the fully open position Po and the absolute value of the twist angle θ when the opening-closing body 13 is in the fully closed position Pc do not have to be equal. Note that the smaller the difference between the absolute value of the twist angle θ when the opening-closing body 13 is in the fully open position Po and the absolute value of the twist angle θ when the opening-closing body 13 is in the fully closed position Pc, the smaller the amount of twist of the electric wire member 30 that accompanies the opening and closing of the opening-closing body 13.

[0043] The first imaginary straight line L1 and the second imaginary straight line L2 may be set to different lengths. Note that the smaller the difference between the lengths of the first imaginary straight line L1 and the second imaginary straight line L2, the smaller the amount of bending of the intermediate portion 23 and the electric wire member 30 when the opening / closing body 13 is opened or closed.

[0044] The electric wire member 30 may be fixed to the fixing piece 24 by, for example, a cable tie. The fixed piece 24 may be provided only on the movable end 22, or on both the fixed end 21 and the movable end 22.

[0045] The electric wire member 30 may be configured to include a plurality of electric wires 31, or may be configured to include the electric wire 31 and one or more other electric wires. The electric wire member 30 is not limited to an LVDS cable having an electric wire 31 and a braided member 32. For example, the core of the electric wire 31 may be made of a braided member formed by weaving together a plurality of metal wires. In this case, since the core of the electric wire 31 is made of a braided member that is easily damaged by twisting, it is possible to obtain a more significant damage suppression effect by keeping the amount of twisting of the electric wire member 30 small.

[0046] The embodiments and modifications disclosed herein are illustrative in all respects, and the present invention is not limited to these examples. That is, the scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0047] 10 Wire harness 11 Mounting target 12 Fixed part 12a Mounting surface 13 Opening and closing body 13a Mounting surface 14 Hinge axis 20 Grommets 21 Fixed side end 21a Lip 21b seat 22 Movable end 22a Lip 22b seat 23 Middle section 24 Fixed piece 25 adhesive tape 26 Bellows 26a Large diameter section 26b Small diameter section 30 Electrical wiring components 30a 1st part 30b 2nd part 31 Electric wire 32 Braided material θ Twist angle θ1 angle θ2 1st battery angle θ3 2nd battery angle θ4 rotation angle C1 Center of fixed end C2 Center of the movable end C2a center when open C2b Center when closed C2c intermediate time center CL axis L1 First virtual line L2 Second virtual line L3 Third virtual line L4 center axis L5 center axis PC fully closed position Pm intermediate position Po fully open position

Claims

1. A wire harness to be attached to an attachment object, the wire harness comprising a fixed portion and an opening / closing body that is opened and closed relative to the fixed portion between a fully open position and a fully closed position, an electric wire member disposed between the fixing portion and the opening / closing body; the electric wire member is routed between the fixed portion and the opening / closing body, enters the interior of the fixed portion through a through hole formed in an attachment surface of the fixed portion, and enters the interior of the opening / closing body through a through hole formed in an attachment surface of the opening / closing body, the electric wire member is fixed to the through hole of the fixing part so that, when the opening-closing body is at the fully open position, the twist angle of the electric wire member is a positive value, the twist angle of the electric wire member is 0 degrees when the opening-closing body is at an intermediate position between the fully open position and the fully closed position, and the twist angle of the electric wire member is a negative value when the opening-closing body is at the fully closed position. Wire harness.

2. the absolute value of the torsion angle when the opening / closing body is in the fully open position is equal to the absolute value of the torsion angle when the opening / closing body is in the fully closed position; The wire harness according to claim 1 .

3. The intermediate position is a position that is midway between the fully open position and the fully closed position. The wire harness according to claim 1 .

4. a grommet disposed between the fixing portion and the opening / closing body; The grommet has a fixed end portion fixed to the fixing portion and a movable end portion fixed to the opening / closing body, The electric wire member is passed through the grommet, a straight line connecting the center of the movable side end portion and the center of the fixed side end portion when the opening / closing body is in the fully open position is defined as a first virtual straight line; a straight line connecting the center of the movable side end portion and the center of the fixed side end portion when the opening / closing body is in the fully closed position is defined as a second virtual straight line; When the line connecting the center of the movable side end portion and the center of the fixed side end portion when the opening / closing body is in the intermediate position is defined as a third virtual line, The third virtual line is set at a position that bisects the angle formed by the first virtual line and the second virtual line. The wire harness according to claim 1 .

5. The wire member includes a braided member. The wire harness according to claim 1 .

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