Electromagnetic shield member and wire harness

An electromagnetic shield member that includes a pressing mechanism with: a cylinder provided on one of a bottom wall of the groove and an opposing wall of the cover opposing the bottom wall of the groove; a piston provided so as to be capable of reciprocal movement in the cylinder; a spring that is provided in the cylinder, and is configured to bias the piston toward one end of the cylinder; and a piston rod that is coupled to the piston, protrudes from the one end of the cylinder, and has a leading end configured to press the electrical wire.

BACKGROUND

The present disclosure relates to an electromagnetic shield member and a wire harness.

Conventionally, for example, a wire harness applied to a vehicle such as an electric car is provided with a plurality of electrical wires and an electromagnetic shield member that has conductive properties and electromagnetically shields the electrical wires by individually covering the electrical wires (e.g., see JP 2005-44607A). The electromagnetic shield member disclosed in JP 2005-44607A includes a shielding protector that has groove-shaped housing portions in which electrical wires can be individually housed, and a cover that seals off the groove-shaped housing portions. The electrical wires are electromagnetically shielded due to the outer circumferential surfaces of the electrical wires being covered by the shielding protector and the cover.

SUMMARY

In a wire harness provided with a conventional electromagnetic shield member, including the electromagnetic shield member disclosed in JP 2005-44607A, heat is generated due to an electrical current flowing through the electrical wires. There is a concern of electrical wires floating from the inner surface of the electromagnetic shield member due to the electrical wires thermally expanding. The inventors of the present disclosure realized that, as a result, the contact surface area between the electrical wires and the electromagnetic shield member is reduced, the efficiency of heat conduction from the electrical wires to the electromagnetic shield member is reduced, and the dissipation of heat from the electrical wires via the electromagnetic shield member deteriorates.

An exemplary aspect of the disclosure provides an electromagnetic shield member and a wire harness that can suppress floating of electrical wires from an inner surface of the electromagnetic shield member.

An electromagnetic shield member according to an exemplary aspect includes: a case that includes a groove in which an electrical wire is to be individually housed; a cover configured to be attached to the case and cover the groove; and a pressing mechanism that is provided on one of the case and the cover, and is configured to press the electrical wire toward other of the case and the cover, wherein the pressing mechanism includes: a cylinder provided on one of a bottom wall of the groove and an opposing wall of the cover opposing the bottom wall of the groove; a piston provided so as to be capable of reciprocal movement in the cylinder; a spring that is provided in the cylinder, and is configured to bias the piston toward one end of the cylinder; and a piston rod that is coupled to the piston, protrudes from the one end of the cylinder, and has a leading end configured to press the electrical wire.

With this configuration, the leading end of the piston rod of the pressing mechanism provided on one of the case and the cover presses the electrical wire toward the other one of the case and the cover. Accordingly, floating of the electrical wire from the inner surface of the electromagnetic shield member can be suppressed.

Also, if a configuration is employed in which, for example, an electrical wire is pressed against a bottom wall or the like of a groove using a band member, there is a concern that the band member will bite into the electrical wire due to thermal expansion or vibration of the electrical wire.

In this respect, with the above configuration, displacement caused by thermal expansion or vibration of the electrical wire is absorbed by the spring. Accordingly, the above-described issues can be kept from occurring.

In several examples of the present disclosure, the pressing mechanism includes a grip that is provided at the leading end of the piston rod and is configured to grip the electrical wire, and the piston is configured to pivot in a circumferential direction centered around an axis of the cylinder, inside the cylinder.

With this configuration, the leading end of the piston rod is provided with the grip that grips the electrical wire. The piston to which the piston rod is coupled is provided so as to be able to pivot in the circumferential direction centered around the axis of the cylinder. Thus, the portion of the electrical wire sandwiched by the grip can pivot in the above circumferential direction. Accordingly, when excess length is generated in the electrical wire due to thermal expansion, due to the piston pivoting, the electrical wire can curve while remaining pressed against the bottom wall of the case or the opposing wall of the cover. Thus, even if excess length is generated in the electrical wire, floating of the electrical wire can be suppressed.

In several examples of the present disclosure, the electromagnetic shield member further includes a first protrusion and a second protrusion configured to respectively restrict rotation of the piston to one side and another side in the circumferential direction of the piston, wherein: the groove includes a plurality of grooves and the pressing mechanism includes a plurality of pressing mechanisms that are provided spaced apart from each other in an extending direction of the plurality of grooves of the case, and a first pressing mechanism out of two of the plurality of pressing mechanisms that are adjacent in the extending direction is provided in a state where rotation of the piston thereof to the one side is restricted by the first protrusion, and a second pressing mechanism out of the two of the plurality of pressing mechanisms is provided in a state where rotation of the piston thereof to the another side is restricted by the second protrusion.

With this configuration, the pistons of the two pressing mechanisms that are adjacent in the extending direction of each groove are only allowed to rotate in opposite directions. Thus, in the case where excess length is generated in an electrical wire due to thermal expansion, the portion of the electrical wire located between the two corresponding pressing mechanisms is unlikely to curve so as to bulge to the one side in the width direction of the grooves, and is more likely to curve to the other side in the width direction of the grooves.

Here, in the case where, for example, a heat source or the like is present on one side in the width direction of the electromagnetic shield member, curving of the electrical wires in the grooves toward the one side is not favorable as heat is more likely to be generated in the electrical wires.

Thus, if the two above-described pressing mechanisms are arranged such that the portion of the corresponding electrical wire located between the pressing mechanisms is made less likely to curve toward the above-described one side, the electrical wires in the groove portions can be kept from curving toward the heat source.

In several examples of the present disclosure, the grip is provided with a pair of arms, and the pair of arms are provided such that the distance between leading ends thereof can be changed.

With this configuration, the distance between the leading ends of the pair of arms constituting the grip can be changed. Thus, various types of electrical wires of varying sizes can be gripped.

Also, wire harness for achieving the aforementioned object, the wire harness including: the electrical wire; and the electromagnetic shield member, wherein the pressing mechanism is provided on one of the case and the cover, and presses the electrical wire toward the other of the case and the cover.

With this configuration, operations and effects similar to those of any one of the above-described electromagnetic shield members can be realized.

With the present disclosure, floating of electrical wires from an inner surface of the electromagnetic shield member can be suppressed.

DETAILED DESCRIPTION OF EMBODIMENTS

An embodiment of an electromagnetic shield member and a wire harness will be described below with reference toFIGS.1to7. Note that, in the accompanying drawings, some of the components may be exaggerated or simplified for the sake of convenience of description. The dimensional ratios of the components may also be different from the actual dimensional ratios thereof.

The wire harness according to the present embodiment is routed along a path including under the floor of a vehicle such as a hybrid car or electric vehicle, for example, and electrically connects devices to each other.

As shown inFIGS.1and2, the wire harness is provided with two electrical wires10arranged in parallel, and a conductive electromagnetic shield member20that covers the electrical wires10.

Each electrical wire10includes a conductive core wire and an insulating coating that covers the outer circumferential surface of the core wire.

The electromagnetic shield member20is provided with a case30that has groove portions30aand30b(grooves) into which the electrical wires10are individually housed, a cover40that is attached to the case30and covers the groove portions30a30b, and a plurality of (four in the present embodiment) pressing mechanisms50that are provided on the cover40and press the electrical wires10. The case30and the cover40are made of a metal material such as an aluminum alloy.

Note that, in the following, the direction in which the groove portions30aand30bextend is defined as an extending direction L, and the direction that is orthogonal to the extending direction L and is the direction in which the groove portions30aand30bare arranged in parallel is defined as a width direction W.

As shown inFIG.2, the case30has a bottom wall31that extends along the extending direction L and a plurality of side walls32. As shown in the example inFIG.2, the case30has three side walls32that respectively protrude from the two ends of the bottom wall31in the width direction W and a central portion in the width direction W. The side walls32each extend along the entirety of the bottom wall31in the extending direction L.

The groove portions30aand30bare each formed by the bottom wall31and a pair of side walls32that are adjacent in the width direction W. In the present embodiment, the groove portion30aand the groove portion30bshare the side wall32located at the center portion in the width direction W.

The case30has a pair of L-shaped brackets35respectively joined to the outer faces of the side walls32at the two ends of the case30in the width direction W. Each bracket35has a joining portion36joined to one end in the extending direction L of the corresponding side wall32, and an attachment portion37that is bent from the one end in the extending direction L of the joining portion36. Each attachment portion37is provided with an attachment hole38that extends therethrough in the extending direction L. Note that each attachment portion37is flush with the one end in the extending direction L of the corresponding side wall32.

As shown inFIG.2, the cover40has an opposing wall41that extends along the extending direction L and opposes the bottom wall31of the case30, and two side walls42that protrude from the two ends in the width direction W of the opposing wall41. The side walls42each extend along the entirety of the opposing wall41in the extending direction L.

As shown inFIGS.1and4, the side walls32at the two ends of the case30in the width direction W are covered from the outer side in the width direction W by the side walls42of the cover40.

As shown inFIG.2, the cover40has a pair of L-shaped brackets45respectively joined to the outer faces of the side walls42at the two ends of the cover40in the width direction W. Each bracket45has a joining portion46joined to one end in the extending direction L of the corresponding side wall42, and an attachment portion47that is bent from the one end in the extending direction L of the joining portion46. Each attachment portion47is provided with an attachment hole48that extends therethrough in the extending direction L.

Here, escape portions49for preventing interference with the joining portions36of the bracket35of the case30when the cover40is attached to the case30, are formed by cutting out portions at the one end in the extending direction L of the side walls42. The joining portion46of each bracket45covers the corresponding escape portion49from the outer side in the width direction W.

By overlapping the brackets35of the case30and the brackets45of the cover40in the extending direction L, and screwing nuts101onto bolts100passed through the attachment holes38of the brackets35and the attachment holes48of the brackets45, the cover40is fixed to the case30.

As shown inFIGS.3and4, the pressing mechanism50includes a cylinder60provided on the inner face of the opposing wall41of the cover40, a disc-shaped piston70provided so as to be able to reciprocally move in the cylinder60, and a column-shaped piston rod71that is coupled to the piston70. The leading end portion of the piston rod71protrudes from one end (lower end inFIGS.3and4) of the cylinder60. A coil spring80serving as a biasing member that biases the piston70toward the above-described one end of the cylinder60is provided in the cylinder60. Note thatFIG.3shows the pressing mechanism50in a state where it is housed with the electrical wire10in the electromagnetic shield member20, that is, a state where the coil spring80is elastically compressed.

The cylinder60has a cylindrical peripheral wall62and a top wall61and a bottom wall63respectively provided at the ends of the peripheral wall62. The inner portion of the cylinder60is formed by the peripheral wall62, the top wall61, and the bottom wall63, and is formed as a columnar housing space in which the piston70is housed. Note that the cylinder60is made of a resin material. Also, while omitted from the drawings, the cylinder60is formed by a pair of halved bodies that each have a semi cylindrical shape and engage with each other.

In the following, a circumferential direction centered around the axis of the cylinder60is simply referred to as a circumferential direction C.

The cylinder60is attached to the cover40by fitting the upper end portion of the cylinder60, including the top wall61, into a fitting hole (not shown) provided in the opposing wall41of the cover40, for example.

The central portion of the bottom wall63of the cylinder60is provided with an insertion hole64into which the piston rod71is inserted.

The leading end portion of the piston rod71is provided with a columnar pressing portion73that has a larger diameter than the piston rod71. In the present embodiment, the electrical wire10is pressed toward the bottom wall31of the case30by the pressing portion73.

The pressing portion73of the piston rod71is provided with a pair of arm portions90(arms) serving as a grip portion that grips the electrical wire10. The arm portions90are provided such that the distance between the two leading end portions thereof can be changed through elastic deformation.

The lower end portion of the cylinder60including the bottom wall63is provided with a cut-out portion65formed by cutting out a portion of both the peripheral wall62and the bottom wall63. The outside and inside of the cylinder60are brought into communication with each other via the cut-out portion65. The angle formed by an end surface65aon one side in the circumferential direction C of the cut-out portion65and an end surface65bon the other side in the circumferential direction C is 90°.

The outer diameter of the piston70is slightly smaller than the inner diameter of the cylinder60. Also, the outer diameter of the piston rod71is slightly smaller than the diameter of the insertion hole64in the bottom wall63of the cylinder60. The piston70, the piston rod71, the pressing portion73, and the arm portions90are formed integrally using a resin material.

Based on the description above, the piston70is provided so as to be able to pivot in the circumferential direction C inside the cylinder60.

A rectangular plate-shaped protruding ridge72is provided on the outer circumferential surface of the piston rod71. The cross-sectional shape in the protruding direction of the protruding ridge72is a rectangle that is elongated in an up-down direction. The protruding ridge72is provided at a position of the piston rod71that corresponds to the cut-out portion65of the cylinder60, and protrudes outward past the outer circumferential surface of the peripheral wall62of the cylinder60.

As shown inFIG.5(a), as a result of the protruding ridge72abutting against the end surface65aof the cut-out portion65from the one side in the circumferential direction C accompanying rotation of the piston70, the piston70is kept from rotating to the other side in the circumferential direction C. Below, the position of the piston70in the circumferential direction C at this time is referred to as a “first position”.

As shown inFIG.5(b), the piston70at the first position is allowed to rotate toward the one side in the circumferential direction C.

Similarly, as a result of the protruding ridge72abutting against the end surface65bof the cut-out portion65from the other side in the circumferential direction C accompanying rotation of the piston70, the piston70is kept from rotating to the one side in the circumferential direction C. Below, the position of the piston70in the circumferential direction C at this time is referred to as a “second position”.

The piston70at the second position is allowed to rotate toward the other side in the circumferential direction C.

Based on the description above, the piston70is provided so as to be able to pivot between the first position and the second position, inside the cylinder60.

In the present embodiment, the protruding ridge72of the piston rod71and the end surface65aof the cut-out portion65of the cylinder60constitute a first restricting portion51(first protrusion) that restricts rotation of the piston70to the other side in the circumferential direction C. Similarly, the protruding ridge72of the piston rod71and the end surface65bof the cut-out portion65of the cylinder60constitute a second restricting portion52(second protrusion) that restricts rotation of the piston70to the one side in the circumferential direction C.

As shown inFIG.6, in the present embodiment, two pressing mechanisms50are arranged adjacent to each other in the extending direction L in each of the groove portions30aand30b. Of the two pressing mechanisms50in each of the groove portions30aand30b, the pressing mechanism50on one side in the extending direction L (left side inFIG.6) is attached to the cover40so that the piston70is located at the first position, and the pressing mechanism50on the other side in the extending direction L (right side inFIG.6) is attached to the cover40so that the piston70is located at the second position. Note that the leading end surfaces of the protruding ridges72of the piston rods71of the two pressing mechanisms50in each groove portion30aand30boppose each other in the extending direction L.

Below, for ease of description, the pressing mechanism50attached to the cover40so that the position of the piston70is at the first position is referred to as a “pressing mechanism50A”, and the pressing mechanism50attached to the cover40so that the position of the piston70is at the second position is referred to as a “pressing mechanism50B”.

As described above, the pistons70of the pressing mechanisms50A and50B are allowed to rotate to the side that is opposite to the side to which rotation is restricted in the circumferential direction C. For this reason, the two pressing mechanisms50A and50B in each of the groove portions30aand30bare only allowed to rotate in opposite directions in the circumferential direction C.

Operations of the present embodiment will be described below.

As shown inFIG.6, in a state where an electrical wire10is disposed extending along the extending direction L in each of the groove portions30aand30b, the positions of the pistons70of the pressing mechanism50A and the pressing mechanism50B are respectively the first position and the second position. The electrical wires10are pressed toward the bottom wall31of the case30by the pressing portions73of the pressing mechanisms50A and50B (referred to as “Operation 1” below).

The pressing portion73of each of the piston rods71is provided with the pair of arm portions90that grip the electrical wire10. The piston70, to which the piston71is coupled, is provided so as to be able to pivot in the circumferential direction C inside the cylinder60. Thus, the portion of each electrical wire10sandwiched between a pair of arm portions90can pivot in the circumferential direction C. Accordingly, when excess length is generated in the electrical wires10due to thermal expansion, due to the pistons70pivoting, the electrical wires10can curve so as to bulge in the width direction W while remaining pressed against the bottom wall31of case30(referred to as “Operation 2” below).

For this reason, the two pressing mechanisms50A and50B are only allowed to rotate in opposite directions in the circumferential direction C. Thus, as shown inFIG.7, the portion of each electrical wire10located between the corresponding pressing mechanisms50A and50B is unlikely to curve so as to bulge to the one side in the width direction W (lower side inFIG.7), and is more likely to curve to the other side in the width direction W (upper side inFIG.7) than toward the aforementioned one side (referred to as “Operation 3” below).

Effects of the present embodiment will be described below.

(1) An electromagnetic shield member20including: a case30that has groove portions30aand30binto which two electrical wires10are individually housed, respectively; a cover40that is attached to the case30and covers the groove portions30aand30b; and pressing mechanisms50that are provided on the cover40, and press the electrical wires10toward a bottom wall31of the case30. Each of the pressing mechanisms50includes: a cylinder60provided on an opposing wall41of the cover40; a piston70provided so as to be capable of reciprocal movement in the cylinder60; and a coil spring80provided in the cylinder60as a biasing member that biases the piston70toward one end of the cylinder60. Also, each pressing mechanism50includes a piston rod71that is coupled to the piston70, protrudes from the one end of the cylinder60, and has a leading end portion that presses an electrical wire10.

With this configuration, the above-described Operation 1 is realized, and thus floating of the electrical wires10from an inner surface of the electromagnetic shield member20can be suppressed.

Also, if a configuration is employed in which, for example, an electrical wire10is pressed against the bottom wall31or the like of the case30using a band member, there is a possibility that the band member will bite into the electrical wire10due to thermal expansion or vibration of the electrical wire10.

In this respect, with the above configuration, displacement caused by thermal expansion or vibration of the electrical wire10is absorbed by the coil spring80. Accordingly, the above-described issues can be kept from occurring.

(2) Each pressing mechanism50is provided with a pair of arm portions90that are provided at a leading end portion of the piston rod71and serve as a grip portion that grips the corresponding electrical wire10, and the piston70is provided so as to be able to pivot in a circumferential direction C centered around the axis of the cylinder60, inside the cylinder60.

With this configuration, the above-described Operation 2 is realized, and thus even if excess length is generated in the electrical wire10, floating of the electrical wire10can be suppressed.

(3) The electromagnetic shield member20is provided with a first restricting portion51and a second restricting portion52that respectively restrict rotation of the piston70to one side and another side in the circumferential direction C of the piston70. Two pressing mechanisms50are provided spaced apart from each other in an extending direction L of each of the groove portions30aand30bof the case30. Out of these two pressing mechanisms50, one pressing mechanism50(50A) is attached to the cover40in a state where rotation of the corresponding piston70to the one side is restricted by the first restricting portion51, and the other pressing mechanism50(50B) is attached to the cover40in a state where rotation of the corresponding piston70to the other side is restricted by the second restricting portion52.

With this configuration, the above-described Operation 3 can be realized.

Here, in the case where, for example, a heat source or the like is present on one side in the width direction W of the electromagnetic shield member20, curving of the electrical wires10in the groove portions30aand30btoward the above-mentioned one side is not favorable as heat is more likely to be generated in the electrical wires10.

Thus, if the two above-described pressing mechanisms50are arranged such that the portion of the corresponding electrical wire10located between the pressing mechanisms50is made less likely to curve toward the above-described one side, the electrical wires10in the groove portions30aand30bcan be kept from curving toward the heat source.

(4) A pair of arm portions90are provided so that the distance between leading end portions thereof can be changed.

With this configuration, the distance between the leading end portions of the pair of arm portions90can be changed, and thus various types of electrical wires of varying sizes can be gripped.

(5) A wire harness is provided with two electrical wires10and the electromagnetic shield member20. The pressing mechanisms50are provided on the cover40, and press the electrical wires10toward the bottom wall31of the case30.

With this configuration, effects according to the above-described Effects (1) to (4) can be realized.

The following changes can be made to the present embodiment. The present embodiment and the following variations can be combined and implemented as long as there no technical contradiction.In the present embodiment, the pressing mechanism50A and the pressing mechanism50B are arranged in this order from the one side in the extending direction L, in each of the groove portions30aand30b, but as shown inFIG.8, the pressing mechanism50A and the pressing mechanism50B may be arranged in this order from the other side of the extending direction L in the one groove portion30a(the groove portion30aon the lower side inFIG.8), for example. In this case, the directions in which the electrical wires10in the groove portions30aand30bare likely to curve in the width direction W are opposite directions. Accordingly, a portion of one electrical wire10between the pressing mechanism50A and the pressing mechanism50B can be kept from approaching the corresponding portion of the adjacent electrical wire10, in the width direction W. Thus, heat can be kept from accumulating in the electromagnetic shield member20due to the electrical wires10approaching each other.The present disclosure can also be applied to a wire harness that has one electrical wire10or three or more electrical wires10.The pair of arm portions90may be biased by a biasing member such as a spring so that the leading end portions thereof approach each other. In this case, the distance between the leading end portions of the arm portion90can be changed by separating the leading end portions against the biasing force of the above biasing member.The pair of arm portions90may be provided such that the distance between the leading end portions thereof cannot be changed.In each of the pressing mechanisms30aand30b, only one pressing mechanism50can also be provided in the extending direction L, and three or more pressing mechanisms50can also be provided.

The cut-out portion65may also be formed by only cutting out a portion of the bottom wall63of the cylinder60, and may also be formed by only cutting out a portion of the peripheral wall62.In a state where each electrical wire10is curved in advance to the one side or the other side in the width direction W, the pressing mechanisms50A and50B may be arranged in the groove portions30aand30bsuch that this state is maintained.Each of the pressing mechanisms50A and50B can be arranged rotated 180° in the circumferential direction C so that the directions in which the protruding ridges72protrude are the opposite of those in the present embodiment.As illustrated with the second variation shown inFIGS.9(a) and9(b), the first restricting portion51(second restricting portion52) is not limited to being constituted by the protruding ridge72of the piston rod71and the end surface65a(end surface65b) of the cut-out portion65of the cylinder60. As another example, a first restricting portion151(second restricting portion152) may be constituted by a protruding ridge172provided on an inner circumferential surface of a through-hole164in a bottom wall163of a cylinder160and a cut-out portion165formed in the outer circumferential surface of a piston rod171. In this case as well, an effect according to the above-described Effect (3) can be realized. Note that configurations in the second variation that are the same as those of the above-described embodiment are given the same reference numerals, and corresponding configurations are given reference numerals to which100has been added to omit redundant description.The first restricting portion51and the second restricting portion52can be omitted. In this case as well, an effect according to the above-described Effect (2) can be realized.A semi-cylindrical grip portion can be provided at the leading end portion of the piston rod71instead of the pair of arm portions90. In this case as well, the piston rod71can press the electrical wire10via the above-described grip portion.The above-described grip portion can also be omitted. In this case as well, an effect according to the above-described Effect (1) can be realized.The pressing portion73can also be omitted. In this case, the leading end portion of the piston rod71may directly press the electrical wire10.

The piston70may also be provided so as to be unable to pivot in the circumferential direction C inside the cylinder60.Each of the pressing mechanisms50may be provided on the bottom wall31of the case30. In this case, each electrical wire10is pressed toward the opposing wall41of the cover40.The electromagnetic shield member20is not limited to being made of an aluminum alloy. As another example, the electromagnetic shield member20may be made of stainless steel or the like.The cross-sectional shape of a plane of the electrical wire10orthogonal to the extending direction L may be any cross-sectional shape such as a semi-circle or a polygonal shape.

The present disclosure encompasses the following implementation examples. The reference numerals of the representative components in the representative embodiment are provided not for limitation but for assistance in understanding.

One or more implementation examples of this disclosure is directed to an electromagnetic shield member (20) configured to electromagnetically shield an electrical wire (10), the electromagnetic shield member (20) including:

a housing chamber (30a) that has a first length and is configured to house a predetermined length portion of the electrical wire (10), the housing chamber (30a) having a bottom surface that has the first length and is configured to support the predetermined length portion of the electrical wire (10) from below, and a ceiling surface that opposes the bottom surface; and

an elastic pressing mechanism (50) that is arranged on the ceiling surface of the housing chamber (30a) and elastically presses the electrical wire (10) toward the bottom surface so as to prevent floating of the predetermined length portion of the electrical wire (10) from the bottom surface.

In one or more implementation examples of this disclosure, the elastic pressing mechanism (50) can include a pivoting element (73,90) that pivots in a predetermined pivotable direction accompanying extension of the predetermined length portion of the electrical wire (10).

In one or more implementation examples of this disclosure, the elastic pressing mechanism (50) including the pivoting element (73,90) can be configured such that the predetermined length portion of the electrical wire (10) is allowed to undergo in-plane deformation on the bottom surface, and the predetermined length portion of the electrical wire (10) is prohibited from undergoing out-of-plane deformation relative to the bottom surface.

In one or more implementation examples of this disclosure, the elastic pressing mechanism (50) including the pivoting element (73,90) can be configured such that when the predetermined length portion of the electrical wire (10) extends, due to thermal extension of the electrical wire (10), to a second length longer than the first length, the entire length of the predetermined length portion of the electrical wire (10) that has the second length is constantly in contact with the bottom surface.

In one or more implementation examples of this disclosure, the predetermined pivotable direction of the pivoting element (73,90) can be determined such that the predetermined length portion of the electrical wire (10) undergoes in-plane curving on the bottom surface.

In one or more implementation examples of this disclosure, the pivoting element (73,90) can have a pivotable degree range.

In one or more implementation examples of this disclosure, the predetermined length portion of the electrical wire (10) housed in the housing chamber (30a) can have a first position and a second position that is spaced apart from the first position in a longitudinal direction of the electrical wire (10),

there are a plurality of the elastic pressing mechanisms (50) that respectively elastically press the electrical wire (10) at the first position and the second position of the electrical wire (10), and

there are a plurality of pivoting elements (73,90) that respectively correspond to the first position and the second position of the electrical wire (10).

In one or more implementation examples of this disclosure, the plurality of pivoting elements (73,90) can be configured such that they independently limit an in-plane curving direction of the electrical wire (10) at the first position and an in-plane curving direction of the electrical wire (10) at the second position.

In one or more implementation examples of this disclosure, the housing chamber (30a) can be formed by a groove (31,32) that has an opening end for drawing out the electrical wire (10) in the longitudinal direction (L), and a metal cover (40) configured to cover the groove (31,32) and not cover the opening end, and

the groove (31,32) can be configured such that the predetermined length portion of the electrical wire (10) can be inserted into the groove (31,32) from a radial direction or a lateral direction of the electrical wire (10).

In one or more implementation examples of this disclosure, the electrical wire (10) can have a first cross-sectional shape (a circular shape, for example), and the housing chamber (30a) can have a second cross-sectional shape (a rectangle, for example) that is different from the first cross-sectional shape.

In one or more implementation examples of this disclosure, the electrical wire (10) can be a power line.

In one or more implementation examples of this disclosure, the housing chamber (30a) can be one of a plurality of housing chambers (30a,30b) configured to respectively house a plurality of the electrical wires (10).

It will be apparent to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the technical concept of the present disclosure. Some of the components described in the embodiment (or one or more aspects thereof) may be omitted, or some of the components may be combined, for example. The scope of the present disclosure is intended to be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.