JP7204628B2 - wire harness structure - Google Patents

Description

The present invention relates to wire harness structures.

2. Description of the Related Art A vehicle is equipped with many electric parts, and wire harnesses are used to connect each electric part to a control device, a power source, and the like. 2. Description of the Related Art When a wire harness is used in a vehicle, the wire harness is shielded in order to block noise generated from the wire harness. Also, a pair of conductors forming a wire harness may be arranged in a positional relationship such that magnetic fields generated when current flows cancel each other out. Further, for example, in the vehicle circuit body disclosed in Patent Document 1, noise propagating through the power cable is removed by arranging a dielectric between the power cable and the earth cable.

JP 2018-181732 A

2. Description of the Related Art In hybrid vehicles, electric vehicles, and the like, rotating electric machines such as motors and motor generators are used for driving the vehicle and regenerating electric power. In some hybrid vehicles, an integrated starter generator (ISG) having the functions of a starter (starting device) and an alternator (charging device) is used as a rotating electric machine. In a rotating electrical machine, power is switched to rise and fall by PWM (Pulse Width Modulation) control or the like. Therefore, in the wire harness connected from the power supply to the rotating electric machine, current fluctuations such as pulsating current (ripple current) and alternating current occur.

A wire harness connected from a power source to a rotating electric machine is sometimes arranged below a floor panel as a body panel. Then, it was found that the following problem occurs when the wire harness and the floor panel face each other at positions close to each other. In other words, the magnetic field generated around the wire harness due to fluctuations in the current flowing through the wire harness generates eddy currents in the floor panel, and the Lorentz force (electromagnetic force) acts on the floor panel, causing the floor panel to vibrate. A problem of generating abnormal noise was found. Therefore, when using the wire harness, further measures are required to suppress the generation of abnormal noise in the body panel including the floor panel.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and is intended to provide a wire harness structure that suppresses the vibration of the body panel due to the magnetic field generated in the wire harness and suppresses the generation of abnormal noise in the body panel. It is a thing.

One aspect of the present invention is
a body panel that constitutes a vehicle;
a wire harness arranged facing the body panel;
It has a width larger than the outer diameter of the wire harness, is arranged in a space between the body panel and the wire harness, and shields a magnetic field generated in the wire harness so that eddy currents are not generated in the body panel. and a shield made of a soft magnetic material that makes it difficult for the wire harness structure.
It is in.

In the wire harness structure, a shield made of a soft magnetic material is arranged in a space between the body panel and the wire harness. The shield makes it difficult for the magnetic field generated in the wire harness to reach the body panel, and makes it difficult for eddy currents to occur in the body panel. Due to the placement of the shield, even when a magnetic field is generated around the wire harness due to fluctuations in the current flowing through the wire harness, magnetic flux due to this magnetic field will pass through the shield. This suppresses the generation of eddy currents and Lorentz force in the body panel.

Therefore, according to the wire harness structure, the vibration of the body panel due to the magnetic field generated in the wire harness is suppressed, and the generation of abnormal noise in the body panel is suppressed.

1 is a perspective view of a vehicle provided with a wire harness structure according to a first embodiment; FIG. FIG. 2 is an explanatory diagram showing the wire harness structure according to the first embodiment. FIG. 3 is a cross-sectional view showing a portion provided with a shield of the wire harness structure according to the first embodiment; FIG. 4 is a cross-sectional view showing a portion of the wire harness structure provided with a supporting body according to the first embodiment. 5 is a cross-sectional view showing a portion provided with a shield of another wire harness structure according to the first embodiment; FIG. 6 is a cross-sectional view showing a portion provided with a shield of another wire harness structure according to the first embodiment; FIG. FIG. 7 is an explanatory diagram showing eddy currents generated in the floor panel by the magnetic field of the wire harness when the shield is not used according to the first embodiment. FIG. 8 is a cross-sectional view showing a portion of the wire harness structure provided with the vibration absorbing shield according to the second embodiment. FIG. 9 is a cross-sectional view showing a portion of the wire harness structure provided with a harness support according to the second embodiment. FIG. 10 is a cross-sectional view showing another wire harness structure according to the second embodiment.

A preferred embodiment of the wire harness structure described above will be described with reference to the drawings.
<Embodiment 1>
As shown in FIGS. 1 and 2, the wire harness structure 1 of the present embodiment includes a floor panel 2 as a body panel constituting a vehicle 6, a wire harness 3 arranged to face the floor panel 2, and a floor panel. 2 and the wire harness 3, and includes a shield 4 made of a soft magnetic material. As shown in FIG. 3, the shield 4 has a width larger than the outer diameter of the wire harness 3, shields the magnetic field M generated in the wire harness 3, and makes it difficult for eddy currents to occur in the floor panel 2. It is.

Below, the wire harness structure 1 of this embodiment is explained in detail.
(Floor panel 2)
As shown in FIG. 1 , the body panel on which the wire harness 3 of the present embodiment is arranged to face is the floor panel 2 forming the floor of the interior of the vehicle 6 . In the figure, reference numeral 65 denotes the seat of the vehicle 6, and reference numeral 66 denotes the instrument panel in front of the vehicle 6. As shown in FIG. The wire harness 3 is arranged so close to the floor panel 2 that a magnetic field M generated when a pulsating current (ripple current), an alternating current, or the like flows through the wire harness 3 reaches the floor panel 2 .

As shown in FIG. 3, the shortest distance between the wire harness 3 and the floor panel 2 can be 1 to 3 times the diameter of the wire harness 3 . The wire harness 3 may be arranged facing a body panel other than the floor panel 2 . The floor panel 2 is made of a metal material (soft magnetic material) such as a steel plate for automobiles.

(Wire harness 3)
As shown in FIG. 1, the wire harness 3 of this embodiment is for connecting an ISG (Integrated Starter Generator) 61 used in a hybrid vehicle to a battery pack 62 as a power supply. The ISG 61 constitutes a rotating electric machine having the functions of a starter (starting device) and an alternator (charging device). As shown in FIGS. 2 to 4, the wire harness 3 has a conductive conductor portion 31 made of a copper material or the like, and an insulating covering portion 32 covering the conductor portion 31. As shown in FIG.

As shown in FIG. 1, the wire harness 3 is for electrically connecting a battery pack 62 arranged below the floor panel 2 of the vehicle 6 and an ISG 61 arranged in the front engine room of the vehicle 6. used for The wire harness 3 is used as a power supply wiring 301 from the battery pack 62 to the ISG 61 , and part of the power supply wiring 301 is arranged below the floor panel 2 so as to face the lower surface of the floor panel 2 . A ground wiring 302 from the ISG 61 to the battery pack 62 is formed by another wire harness 35 and the floor panel 2 .

(Shield 4)
As shown in FIGS. 3 and 4, the shield 4 of this embodiment is formed in a plate shape, and its plate surface is arranged to face the floor panel 2 . The plate surface of the shield 4 means the surface of the shield 4 with the largest surface area. The shield 4 absorbs the magnetic field M generated by the wire harness 3 when the magnetic flux due to the magnetic field M generated in the wire harness 3 passes through.

The shield 4 is arranged at a position where the entire width of the wire harness 3 is contained within the width of the shield 4 when the outer shape of the wire harness 3 is vertically projected onto the floor panel 2 . The thickness of the shield 4 can be appropriately set according to the strength of the magnetic field M generated in the wire harness 3 . Forming the shield 4 in a plate shape facilitates formation of the shield 4 .

The shield 4 is formed in an elongated shape to match the elongated wire harness 3 . The wire harness 3 is arranged so as to face the central portion of the shield 4 in the width direction. The shield 4 is formed to have a width 1.5 to 5 times the diameter of the wire harness 3 so as to shield the magnetic field M generated in the wire harness 3 and prevent the magnetic field M from reaching the floor panel 2 . The shield 4 is arranged to face the lower surface of the floor panel 2 at a position away from the lower surface of the floor panel 2 .

The shield 4 can be arranged over the entire portion of the wire harness 3 facing the floor panel 2 . Also, the shield 4 can be arranged only at a portion where the wire harness 3 and the floor panel 2 are opposed to each other within a predetermined interval or less.

The soft magnetic material forming the shield 4 is also called a soft magnetic material, and has properties of low coercive force and high magnetic permeability. In other words, the soft magnetic material has the property of being magnetized under the influence of the magnetic field (magnetic field) M and demagnetized when the influence of the magnetic field M disappears. The shield 4 can be made of, for example, a soft magnetic material containing iron, silicon, ferrite, or the like.

(Support 5)
As shown in FIGS. 3 and 4 , the wire harness structure 1 further includes a support 5 made of a non-magnetic material that supports the wire harness 3 and shield 4 on the floor panel 2 . As shown in FIG. 4, part of the support 5 is attached to the floor panel 2, and the remainder of the support 5 forms a gap S1 with the floor panel 2, as shown in FIG. are placed. By using the support 5, it becomes easier to support the wiring harness 3 and the shield 4 on the floor panel 2. FIG.

The support 5 of this embodiment is made of a resin material and has a tubular shape through which the wire harness 3 and the shield 4 are inserted. The support 5 can be made of various thermoplastic resins. The support 5 of this embodiment is formed in a rectangular tubular shape having a square cross section.

As shown in FIG. 4, a portion of the support 5 is formed by a mounting portion 51 provided on a portion of the support 5 in the longitudinal direction. The attachment portion 51 is attached to the floor panel 2 so as to protrude toward the floor panel 2 from a portion of the support 5 . A plurality of mounting portions 51 are formed separately at appropriate locations in the longitudinal direction of the support 5 . The remaining portion of the support 5 in this embodiment refers to the portion of the support 5 where the mounting portion 51 is not formed.

As shown in FIG. 3 , the shield 4 is held inside the wall portion of the support 5 in the shape of a rectangular tube facing the floor panel 2 . The support 5 can be formed in various shapes to cover the shield 4 . The wire harness 3 is inserted through a hollow space 50 formed inside the support 5 in which the shield 4 is arranged. The wire harness 3 utilizes the support 5 as a guide for determining the wiring direction L, and the wiring position is determined by being inserted into the space 50 of the support 5 . Since the shield 4 is inserted inside the support 5, even if the shield 4 absorbs the magnetic field M of the wire harness 3 and the shield 4 vibrates, the abnormal noise generated by the vibration of the shield 4 is suppressed by the support 5. can be absorbed by

(Another shield 4)
As shown in FIG. 5, the shield 4 is formed with a main shield 41 whose plate surface faces the floor panel 2 and perpendicular to the main shield 41 at both ends of the main shield 41. A pair of sub-shielding portions 42 located on both sides of the wire harness 3 may also be used. In this case, the wire harness 3 can be surrounded from the side facing the floor panel 2 by the shield 4, and the magnetic field M generated from the wire harness 3 can be made more difficult to reach the floor panel 2.

Moreover, the wire harness 3 connected to the ISG 61 and another wire harness connected to another electric device may be inserted inside the cylindrical support 5 . Moreover, the wire harness 3 connected to ISG61 is good also as what gathered multiple wires. The shield 4 can shield the magnetic field M generated in the multiple wire harnesses 3 .

Moreover, as shown in FIG. 6, the support 5 can also be formed in a cylindrical shape. In this case, the shield 4 can be formed in an arc shape along the inner surface of the support 5 . An arc-shaped shield 4 is arranged on the side of the support 5 facing the floor panel 2 . The arcuate shield 4 can be formed in an arcuate shape having an angle of half the circumference (180°) or more.

(Effect)
FIG. 7 shows the wire harness 3 arranged on the floor panel 2 when the shield 4 of this embodiment is not arranged. When a ripple current or the like is generated in the wire harness 3, a magnetic field M is generated around the arrangement direction of the wire harness 3 (center axis direction). When the magnetic flux of the magnetic field M penetrates the floor panel 2, an eddy current E is generated in the floor panel 2 so as to cause a current C2 to flow in the opposite direction to the current C1 flowing in the wire harness 3. .

Further, a Lorentz force acts in a direction perpendicular to the floor panel 2 due to the magnetic field M generated in the wire harness 3 . The current C1 flowing through the wire harness 3 fluctuates as a ripple current, which changes the Lorentz force acting on the floor panel 2, causing the floor panel 2 to vibrate in its thickness direction and generate abnormal noise.

As shown in FIG. 3 , in the wire harness structure 1 of this embodiment, a shield 4 made of a soft magnetic material is arranged in the space between the floor panel 2 and the wire harness 3 . The shield 4 makes it difficult for the magnetic field M generated in the wire harness 3 to reach the floor panel 2 and makes it difficult for eddy currents to occur in the floor panel 2 . Due to the arrangement of the shield 4, even when a magnetic field M is generated around the wire harness 3 due to fluctuations in the current C1 flowing through the wire harness 3, the magnetic flux generated by the magnetic field M passes through the shield 4. . This suppresses the generation of eddy currents and Lorentz force in the floor panel 2 .

Therefore, according to the wire harness structure 1 of the present embodiment, the vibration of the floor panel 2 due to the magnetic field M generated in the wire harness 3 is suppressed, and the floor panel 2 is suppressed from generating abnormal noise.

<Embodiment 2>
In the wire harness structure 1 of this embodiment, as shown in FIG. 8, the structure of the support 5 that supports the shield 4 on the floor panel 2 is different from that of the first embodiment. A wire harness structure 1 of this embodiment includes a vibration absorbing support 5A made of a non-magnetic material instead of the support 5 in the first embodiment.

The vibration-absorbing support 5A supports the shield 4 on the floor panel 2 and absorbs the vibration generated in the shield 4 by receiving the magnetic field M generated in the wire harness 3. As shown in FIG. Magnetic flux generated by the magnetic field M generated in the wire harness 3 passes through the shield 4, thereby generating an eddy current, and the shield 4 tends to vibrate due to the Lorentz force R that accompanies the eddy current. Therefore, when the shield 4 is attached to the floor panel 2 without intervening a space, it is necessary to devise a way to prevent the vibration generated in the shield 4 from being transmitted to the floor panel 2 .

The vibration-absorbing support 5A of this embodiment is attached to the floor panel 2, and is made of a rubber material as an elastic body in order to prevent the vibration generated in the shield 4 from being transmitted to the floor panel 2. there is Also, the vibration absorbing support 5A is sandwiched between the floor panel 2 and the shield 4. As shown in FIG. The thickness of the vibration absorbing support 5A can be determined according to the magnitude of the magnetic field M generated in the wire harness 3. As shown in FIG.

The wire harness 3 is arranged to face the shield 4 with a gap S2 between the wire harness 3 and the shield 4 . As shown in FIG. 9, the wire harness structure 1 of this embodiment includes a harness support 5B for supporting the wire harness 3 on the floor panel 2 in addition to the vibration absorbing support 5A. The harness support 5B is made of thermoplastic resin or the like. The harness support 5B has a portion that supports the wire harness 3 and a portion that is attached to the floor panel 2 . The gap between the wire harness 3 and the shield 4 is maintained at a predetermined gap by the harness support 5B.

The shield 4 and the vibration absorbing support 5A can be formed in various shapes. The shield 4 can be configured by combining a plurality of divided portions of the shield 4 . The vibration absorbing support 5A can be formed in various shapes according to the shape of the shield 4. As shown in FIG.

As shown in FIG. 10 , the shield 4 can be configured by a plurality of shield divided portions 43 divided in a direction parallel to the arrangement direction of the wire harness 3 . The arrangement direction of the wire harness 3 refers to the direction in which the wire harness 3 extends in a long shape. The plurality of shield dividing parts 43 are arranged in a direction parallel to the arrangement direction of the wire harness 3 .

A plurality of support recesses 52 for supporting the respective shield divisions 43 can be formed in the vibration absorbing support 5A. The support recesses 52 are formed between a plurality of ribs (protrusions) 53 provided on the side facing the wire harness 3 in the vibration absorbing support 5A. The plurality of shield dividing portions 43 are arranged in the support recesses 52 and are held in the support recesses 52 of the vibration absorbing support 5A at predetermined intervals.

In this case, the flow of the eddy current E that attempts to pass in the direction parallel to the arrangement direction around the magnetic flux of the magnetic field M generated around the wire harness 3 is divided by the plurality of shield dividing portions 43 . As a result, the magnetic field M generated by the wire harness 3 can be absorbed by the plurality of shield divisions 43 , and the eddy current E is less likely to occur in the plurality of shield divisions 43 . As a result, the Lorentz force is less likely to act on each shield dividing portion 43, and the entire shield 4 can be made more difficult to vibrate.

It should be noted that the plurality of shield dividing portions 43 can also be applied to the shield 4 of the first embodiment. In this case, the supporting body 3 can be formed with supporting recesses for supporting the respective shield dividing parts 43 .

Other configurations, effects, and the like in the wire harness structure 1 of this embodiment are the same as those of the first embodiment. Also, in this embodiment, the constituent elements indicated by the same reference numerals as those in the first embodiment are the same as those in the first embodiment.

The present invention is not limited to only each embodiment, and further different embodiments can be configured without departing from the scope of the invention. In addition, the present invention includes various modifications, modifications within the equivalent range, and the like. Further, the technical idea of the present invention also includes combinations, forms, and the like of various constituent elements assumed from the present invention.

1 wire harness structure 2 floor panel (body panel)
3 wire harness 4 shield 5 support 6 vehicle

Claims (8)

a body panel (2) constituting a vehicle (6);
a wire harness (3) arranged facing the body panel;
having a width larger than the outer diameter of the wire harness, disposed in a space between the body panel and the wire harness, shielding a magnetic field (M) generated in the wire harness, and attached to the body panel A wire harness structure (1) comprising a shield (4) made of a soft magnetic material that makes it difficult for eddy currents to occur. further comprising a support (5) made of a non-magnetic material that supports the wire harness and the shield to the body panel;
2. The wire harness according to claim 1, wherein a part of said support is attached to said body panel and the remaining part of said support is arranged with a gap (S1) between said support and said body panel. Structure. The support is made of a resin material and has a cylindrical shape through which the wire harness and the shield are inserted,
3. The wire harness structure according to claim 2, wherein a part of said support is constituted by a mounting part (51) provided on a part of said support in the longitudinal direction. A vibration absorbing support (5A) that supports the shield on the body panel, receives the magnetic field generated in the wire harness and absorbs vibration generated in the shield, and is made of a non-magnetic material,
The wire harness structure of claim 1, wherein said vibration absorbing support is attached to said body panel. 5. The wire harness structure according to claim 4, wherein said vibration absorbing support is made of a rubber material and sandwiched between said body panel and said shield. The wire harness structure according to any one of claims 1 to 5, wherein the shield has a plate shape with a plate surface facing the body panel. The shield includes a main shield portion (41) whose plate surface faces the body panel, and both ends of the main shield portion which are orthogonal to the main shield portion, and are formed on both sides of the wire harness. The wire harness structure according to any one of claims 1 to 5, further comprising a pair of sub-shielding portions (42) located at . 6. The shield according to any one of claims 1 to 5, wherein the shield is composed of a plurality of shield divided parts (43) divided in a direction parallel to the arrangement direction (L) of the wire harness. wire harness structure.

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