JP2009241809A - Vehicular earth wiring structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and lightweight structure capable of effectively simplifying wiring on an earth side, in the so-called non-body earth type wiring structure which connects a standard electric potential member of an auxiliary machine to a negative electrode terminal. <P>SOLUTION: The vehicular earth wiring structure is disposed in a vehicle, and equipped with a thin and long trunk line 1 including a conductor electrically connected to the negative electrode 12 of the battery 11. At a middle portion in a longitudinal direction of the trunk line 1, a plurality of earth point portions 6 is provided to which an earth wire 7 of the auxiliary machine can be mounted. The trunk line 1 includes an electric wire 21, and the earth point portions 6 are disposed on an earth plate 5 which is a plate-shaped metallic member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ground wiring structure for a vehicle, and more particularly to a so-called non-body ground type ground wiring structure in which a reference potential wiring of an auxiliary device is electrically connected to a negative electrode terminal of a battery without passing through a vehicle body.

As shown in Patent Document 1, an automobile earth circuit has a configuration in which an earth current of an electrical component (hereinafter referred to as an auxiliary machine) of the automobile flows through a metal panel of the vehicle body to a negative terminal of the battery. A lot has been done. In this body grounding type wiring structure, since the ground terminal of the auxiliary machine may be connected to the vehicle body, the connection from the battery to the auxiliary machine may be configured so that the wire harness of the power line is routed only from the positive electrode side. .
JP 2000-134791 A

On the other hand, Patent Document 2 points out and avoids the problem that in a body ground type wiring structure as shown in Patent Document 1, when the power supply line and the body come into contact, a short circuit is formed and an overcurrent flows. Therefore, a body earth abolition type (non-body earth type) wiring structure has been proposed. This wiring structure is a structure in which the ground of each auxiliary machine is returned to the negative electrode side of the battery by the ground wire without dropping to the body, and the negative electrode side of the battery is maintained in an insulated state from the body.
JP 2001-287604 A

  Also, in so-called sports cars, non-metallic bodies are sometimes used for weight reduction due to the importance of athletic performance. In this case, if the ground terminal side of the auxiliary machine is connected to the body as in a general automobile, the electrical resistance of the body is high, so that the operation of the electrical component may become unstable or not function due to a voltage drop. Therefore, in such a non-metal body vehicle, it is necessary to adopt the non-body earth type configuration as described above.

  In this non-body earth type, it is necessary to route the ground wire vertically and horizontally inside the vehicle, and the wiring becomes complicated. In Patent Document 2, a considerably thick harness crosses the engine room at the front part of the vehicle where the power supply to the auxiliary equipment is concentrated, and the wiring work of the harness around the engine is complicated and difficult. The problem that the weight of the harness itself becomes heavy is pointed out. Patent Document 2 discloses a structure that uses an engine housing for ground wiring and a terminal block that can connect a ground wire and an auxiliary device in order to simplify wiring work of the wiring structure and reduce the weight of the harness. Has proposed.

  However, the configuration of Patent Document 2 also has a structure in which the ground-side electric wire is routed in the same manner as the power supply side, and it is inevitable that the ground wire is routed in a complicated route in the vehicle. Therefore, the configuration of Patent Document 2 has been required to be improved from the viewpoint of further simplifying the wiring of the ground wire.

  The present invention has been made in view of the above circumstances, and its main object is to provide a compact and lightweight configuration in a so-called non-body ground type wiring structure while simplifying the wiring of the ground wire. There is.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to an aspect of the present invention, in the vehicle ground wiring structure for electrically connecting the reference potential member of the auxiliary machine or the ground wire drawn from the reference potential member to the negative terminal of the battery without passing through the vehicle body, The following configurations are provided. That is, this vehicle ground wiring structure includes a long and narrow trunk line arranged in the vehicle, and a plurality of earth point parts arranged in the middle in the longitudinal direction of the trunk line. The trunk line includes a conductor that is electrically connected to the negative terminal of the battery. The ground point portion is configured so that the reference potential member or the ground wire can be attached.

  As a result, as the ground wiring structure, the trunk line is routed only to the main part of the vehicle (or the route that can be easily routed), and each auxiliary machine is connected to the ground point part located in the middle of the trunk line. It becomes possible to adopt a layout. For this reason, in the non-body earth type vehicle, the wiring on the earth side can be greatly simplified, and the auxiliary machine earth wire can be connected with almost the same degree of freedom as the body earth type.

  The vehicle ground wiring structure preferably has the following configuration. That is, the trunk line includes an electric wire. The ground point portion is disposed on a metal member formed in a plate shape or a block shape.

  Thereby, the potential reference member or the ground wire can be reliably connected to the trunk line via the metal member. Further, since the metal member is formed in a plate shape or a block shape, it is possible to directly install an auxiliary machine on the metal member. Accordingly, it is possible to further simplify the wiring on the ground side and to expect the effect of cooling the auxiliary machine by the metal member.

  In the above-mentioned vehicle ground wiring structure, it is preferable that a strip portion is formed in the middle in the longitudinal direction of the electric wire, and the plate-like metal member is attached to the strip portion.

  Thereby, it is possible to provide the earth point portion at an arbitrary position in the midway portion in the longitudinal direction of the main line with a simple configuration. Moreover, since it can arrange | position continuously, without interrupting the conductor of an electric wire in the said earth | ground point part, the earth circuit excellent in connection reliability can be provided.

  In the vehicle ground wiring structure, the trunk line is preferably configured by connecting ends of a plurality of electric wires with the metal member.

  As a result, the metal member becomes a part of the main line, so that space saving can be realized, and a main line which is often configured to have a large diameter can be saved, and the main line can be costly. This can contribute to cost reduction.

  The vehicle ground wiring structure preferably has the following configuration. That is, the plate-shaped metal member includes an elongated connection portion for attaching the reference potential member of the auxiliary machine or the ground wire. This connection part is arrange | positioned so that the longitudinal direction may follow the axial direction of the conductor of the said electric wire.

  This makes it easy to reduce the size of the metal member particularly in the direction perpendicular to the axial direction of the conductor. In addition, since the connecting portion is arranged in parallel with the conductor of the electric wire, even if the electric wire (main line) is routed in a narrow space, the work of connecting the ground wire or the like from the auxiliary machine is easily performed. be able to.

  In the vehicle ground wiring structure, the metal member preferably includes a heat pipe or a fin.

  Thereby, even if heat is generated due to the concentrated current flowing at the earth point portion, the heat can be easily radiated by the heat pipe or the fin. In addition, by installing an auxiliary machine that generates a large amount of heat directly on a metal member, the auxiliary machine itself can be cooled.

  In the above-described vehicle ground wiring structure, the conductor of the trunk line is a bus bar, and a plurality of ground point portions are preferably arranged on the bus bar.

  Thereby, it becomes possible to connect the ground wire or the like from the auxiliary machine to an arbitrary ground point among the plurality of ground point portions installed on the bus bar. Therefore, the ground side wiring can be effectively simplified. Further, since the bus bar can easily form the earth point portion at an arbitrary position, a wiring layout in which a large number of earth point portions are formed and the auxiliary machines are connected in a distributed manner can be easily realized.

  In the vehicle ground wiring structure, it is preferable that a connection terminal for connecting the reference potential member of the auxiliary machine or the ground wire is disposed at the ground point portion.

  As a result, it is possible to easily connect the ground wire or the like from the auxiliary machine to the ground point without using a jig or a tool. Further, since the connection work is easy, it is possible to reliably prevent a ground failure due to a work mistake.

  In the vehicle ground wiring structure, a screw hole is preferably formed in the ground point portion.

  As a result, the work of connecting the ground wire to the ground point portion can be carried out by substantially the same work as that performed in the conventional body earth type. Further, since a screw hole structure for easy mounting and dismounting of parts is formed in the ground point portion, it is possible to easily cope with a configuration change such as mounting or replacing an optional auxiliary machine.

  In the vehicle ground wiring structure, it is preferable that the ground point portion is covered with a waterproof cover.

  Thereby, since it can avoid that water splashes on an earth point part, corrosion of the conductor etc. of a trunk line can be prevented. Further, even when a dissimilar metal joint having a large potential difference is formed at the earth point, so-called dissimilar metal contact corrosion can be prevented in advance.

  Next, embodiments of the invention will be described. FIG. 1 is a diagram conceptually showing a vehicle ground wiring structure according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a configuration around the ground point portion in the first embodiment.

  FIG. 1 conceptually shows a vehicle ground wiring structure according to a first embodiment of the present invention. As shown in FIG. 1, the wiring structure of the present embodiment includes an elongated trunk line 1 disposed in a vehicle body 10 along a path passing through a main part of the vehicle, and a plurality of ground plates disposed on the trunk line 1. (Metal member) 5. Although three ground plates 5 are arranged in FIG. 1, this number can be arbitrarily changed.

  A battery 11 is disposed at one end of the trunk line 1. The battery 11 is installed at an appropriate position (for example, an engine room) of the vehicle body 10. The trunk line 1 includes a conductor, and one end of the conductor is electrically connected to a negative electrode terminal 12 included in the battery 11.

  Of the three earth plates 5, two earth plates 5 are arranged in the middle in the longitudinal direction of the trunk line 1, and the remaining one earth plate 5 is one end in the longitudinal direction of the trunk line 1 (the side opposite to the battery 11). At the end). Each earth plate 5 is formed with an earth point portion 6, and the end portion of the earth wire 7 drawn from a reference potential member of an auxiliary machine (not shown) is fixed at the earth point portion 6. As a result, the reference potential member of the auxiliary machine is electrically connected to the negative terminal 12 of the battery 11 via the ground line 7 and the trunk line 1.

  With the above configuration, for example, the trunk line 1 is arranged along an appropriate route passing through the vicinity of the concentrated arrangement place of the auxiliary machine, and the earthing point from the auxiliary machine is provided at the earth point part 6 provided in the middle part of the trunk line 1. By connecting the wire 7 or the like, the ground side wiring can be simplified effectively, which can contribute to the reduction in cost and weight of the vehicle.

  As for the position of the earth plate 5 (and the earth point portion 6), it can be arbitrarily set as long as it is a midway position in the longitudinal direction of the trunk line 1, but from the viewpoint of shortening the earth wire 7 drawn from the auxiliary machine, It is preferable to adopt a layout in which a large number of auxiliary machines are arranged near a part where the auxiliary machines are concentrated. In addition, it is preferable to place the ground plate 5 (the ground point portion 6) in a portion where a relatively wide space can be secured around the main line 1 in terms of facilitating connection work of the ground wire 7 and the like.

  Next, specific configurations of the ground plate 5 and the ground point portion 6 will be described with reference to FIG. In FIG. 2, the trunk line 1 is composed of a single electric wire 21, and a plurality of strip portions 22 are formed on the middle portion of the electric wire 21 in the longitudinal direction by stripping the insulation coating to a predetermined length. And in this strip part 22, the earth plate 51 is attached to the exposed part of the conductor 23 of the electric wire 21. FIG.

  The earth plate 51 is formed by punching a metal plate having conductivity into a substantially U shape. Specifically, the ground plate 51 includes a main line connection part 31 and an auxiliary machine connection part (connection part) 32 arranged so as to be parallel to the axial direction of the electric wire 21, and the main line connection part 31 and the auxiliary machine connection. The connection part 33 which connects the one ends of the part 32 is comprised integrally.

  A caulking portion 35 is integrally formed at the end of the main line connecting portion 31. The crimping portion 35 is crimped to the conductor 23 exposed in the strip portion 22, so that the earth plate 51 is fixed to the electric wire 21.

  Further, a caulking portion 36 is also formed integrally with the auxiliary machine connecting portion 32, and the caulking portion 36 is pressure-bonded to the concentrated joint portion 8 of the ground wire 7. The concentrated joint portion 8 is configured by bundling a plurality of the ground wires 7 and joining the conductors of the ground wires 7 at one end thereof with, for example, ultrasonic waves.

  The longitudinal direction of the ground wire 7 is arranged so as to substantially coincide with the longitudinal direction of the accessory connection portion 32. That is, the ground wire 7 is connected to the auxiliary machine connecting portion 32 so as to be substantially along the axial direction of the electric wire 21. With this configuration, it is possible to reduce the size of the ground plate 51 particularly in the direction perpendicular to the axial direction of the electric wire 21 and to easily connect the ground wire 7 even when a large work space cannot be secured around the ground plate 51. Can be done.

  Note that the attachment of the ground plate 51 to the conductor 23 can be performed by welding or bolt fixing, for example, instead of being crimped by the caulking portion 35. Similarly, the attachment of the ground wire 7 to the ground plate 51 can be performed by, for example, welding or bolt fixing instead of the crimping by the caulking portion 36.

  As described above, in the vehicle ground wiring structure of the present embodiment, the ground wire 7 drawn from the reference potential member of the auxiliary machine is electrically connected to the negative terminal 12 of the battery 11 without passing through the vehicle body 10. Is configured to do. And this wiring structure is provided with the trunk line 1 arrange | positioned at a vehicle, and the some earthing point part 6 arrange | positioned in the longitudinal direction middle part of this trunk line 1. FIG. The trunk line 1 includes a conductor (conductor 23 of the electric wire 21) that is electrically connected to the negative electrode terminal 12 of the battery 11. The ground point portion 6 is configured so that a ground wire 7 from an auxiliary machine can be attached.

  With this configuration, the main line 1 is arranged only in an important part of the vehicle (or arranged along a route that can be easily routed), and each auxiliary machine has an earth point part arranged in the middle part of the main line 1 Thus, a ground wiring structure having a layout in which the ground wire 7 is connected to 6 can be realized. For this reason, in the non-body earth type vehicle, the ground side wiring can be greatly simplified, and the auxiliary machine earth wire 7 can be connected with the same degree of freedom as the body earth type. Therefore, the configuration of the present embodiment is particularly suitable for a sports car or the like that has a non-metallic body and is strongly required to be lightweight.

  Further, in the vehicle ground wiring structure of the present embodiment, the trunk line 1 includes an electric wire 21, and the ground point portion 6 is disposed on a ground plate 51 formed in a plate shape.

  With this configuration, the ground wire 7 can be reliably connected to the trunk line 1 via the ground plate 51.

  Further, in the vehicle ground wiring structure of the present embodiment, a strip portion 22 is formed in the middle in the longitudinal direction of the electric wire 21, and the ground plate 51 is attached to the strip portion 22.

  With this configuration, the earth point portion 6 can be formed at an arbitrary position in the midway portion in the longitudinal direction of the main line 1 with a simple configuration. Moreover, since the electric wire 21 is only stripped off at the earth point portion 6 and the continuity of the conductor 23 is maintained, an earth circuit having excellent connection reliability as a whole can be provided.

  Further, in the vehicle ground wiring structure of the present embodiment, the ground plate 51 includes an elongated auxiliary machine connection portion 32 for attaching the ground wire 7 of the auxiliary machine. The auxiliary machine connecting portion 32 is arranged such that its longitudinal direction is along the axial direction of the conductor 23 of the electric wire 21.

  With this configuration, it is possible to prevent the ground plate 51 from protruding greatly in a direction perpendicular to the axial direction of the conductor 23, and the size can be easily reduced. In addition, since the auxiliary machine connecting portion 32 is arranged in parallel with the conductor 23 of the electric wire 21, even when the electric wire 21 (main line 1) is routed in a narrow space, the work of connecting the ground wire 7 etc. from the auxiliary machine Can be easily performed.

  However, the above-described ground plate and ground point portion can be configured as in the second to ninth embodiments described below. In the following description, the same or similar members as those in the first embodiment described above may be denoted by the same reference numerals in the drawings, and the description thereof may be omitted.

  In the configuration of the second embodiment shown in FIG. 3, a male joint connector 41 is integrally formed on the ground plate 52 attached to the strip portion 22 of the electric wire 21. Specifically, the ground plate 52 connects the ends of the main line connection part 31 and the connector support part 38 and the main line connection part 31 and the connector support part 38 arranged so as to be parallel to the axial direction of the electric wire 21. The connecting portion 33 to be connected is integrally provided.

  The distal end portion of the connector support portion 38 is appropriately bent and forms a branch portion, and a four-pole connection terminal (connection portion) 45 is formed at the branch portion. A resin connector housing 46 is integrally formed with the connector support portion 38 so as to cover the periphery of the connection terminal 45.

  The four connection terminals 45 are elongated so that the longitudinal direction thereof is substantially along the axial direction of the conductor 23 of the electric wire 21. The male joint connector 41 is configured to be attached by inserting a female joint connector 42 connected to the ground wire 7 from the auxiliary machine in the axial direction of the conductor 23 of the electric wire 21.

  As described above, in the ground wiring structure for a vehicle according to the present embodiment, the connection terminal 45 for connecting the ground wire 7 drawn from the auxiliary machine is disposed on the ground point portion 6 (ground plate 52). Yes.

  Thereby, the earth wire 7 etc. from an auxiliary machine can be simply connected to the earth point part 6 without using a jig | tool and a tool. Further, since the connection work is easy, it is possible to reliably prevent a ground failure due to a work mistake.

  In the third embodiment shown in FIG. 4, the earth plate 53 is formed in a substantially linear shape, and the joint connector 41 is disposed in the vicinity of the electric wire 21. In short, the present embodiment is configured such that the connector support portion of the second embodiment described above is formed in the main line connection portion 31. In the configuration of FIG. 4, the connecting portion 33 provided in the configuration of FIG. 3 can be omitted, and further miniaturization and space saving can be realized.

  Further, as in the fourth embodiment shown in FIG. 5, the ground plate 54 is formed in a substantially L shape so that the main line connection portion 31 and the connector support portion 38 are vertically connected, and the longitudinal direction of the connection terminal 45 Can be arranged so as to be substantially perpendicular to the axial direction of the conductor 23 of the electric wire 21.

  4 and 5, the female joint connector is not shown, but the female joint connector 42 shown in FIG. 3 can also be connected in these configurations.

  In the fifth embodiment shown in FIG. 6, the electric wire 21 is divided in the middle in the longitudinal direction, and a metal ground plate 55 is interposed therebetween. In other words, the trunk line 1 of the present embodiment is configured by connecting the ends of the plurality of electric wires 21 by the ground plate 55. The ground plate 55 is formed in an elongated rectangular shape, and is arranged so that the longitudinal direction thereof coincides with the longitudinal direction of the electric wire 21.

  A penetrating wire connection hole 25 is formed at one end and the other end of the ground plate 55 in the longitudinal direction. A female screw is formed in the electric wire connection hole 25, and an electric wire terminal 26 fixed to the end of the electric wire 21 is attached by a fixing screw 27. In addition, as the electric wire terminal 26, a well-known LA terminal can be used, for example.

  A plurality of ground holes 28 are formed at positions near the center of the ground plate 55 in the longitudinal direction. A female screw is formed in the ground hole 28 as in the case of the wire connection hole 25, and a ground terminal connected to a ground wire (not shown) can be attached via a ground bolt (not shown). In addition to a general ground terminal, a known concentrated ground joint connector can be attached to the ground hole 28.

  In this configuration, one electric wire cannot be arranged over the entire longitudinal direction of the trunk line 1 as in the first to fourth embodiments described above, but the ground plate 55 can be freely installed in the middle part of the trunk line 1. Even when the space is small, a layout in which the ground plate 55 is installed near the auxiliary machine is possible. Moreover, the electric wire used for the trunk line 1 for earthing has to be thick so that a large current can flow, and the cost is often higher than electric wires for other uses. If the ground plate 55 is arranged in this way, the length of the electric wire can be shortened accordingly, and the cost can be effectively reduced. In particular, the ground plate 55 is formed in an elongated shape, the longitudinal direction of the ground plate 55 is aligned with the longitudinal direction of the electric wire 21, and the end of the electric wire 21 is connected to the end of the ground plate 55. While maintaining, the electric wire 21 can be shortened effectively.

  Further, since the screw plate type ground hole 28 is formed in the ground plate 55, it is not necessary to connect the ground wire from the auxiliary machine by a special method. Wiring work can be performed like a wiring structure. Therefore, the difficulty of wiring work can be reduced.

  As described above, in the ground wiring structure for a vehicle according to the present embodiment, the trunk line 1 is configured by connecting ends of the plurality of electric wires 21 by the ground plate 55.

  With this configuration, since the earth plate 55 becomes a part of the trunk line 1, space saving can be realized, and the cable 21 for the trunk line 1 having a large wire diameter and high cost can be saved, and the weight and the cost can be reduced. It can contribute to the conversion.

  In the present embodiment, the ground point portion 6 is formed with a ground hole 28 in which a female screw is formed.

  With this configuration, the ground wire can be connected to the ground point portion 6 by the same work as the connection work performed in the conventional body ground type. In addition, since the screw-type ground hole 28 can be easily mounted and removed, it is possible to easily cope with a change in configuration such as mounting or replacing an optional auxiliary machine. .

  The ground plate 56 of the sixth embodiment shown in FIG. 7 does not have the ground hole 28 as in the above-described fifth embodiment, and instead has a configuration in which a male joint connector 41 is attached to the ground plate 56. Yes. More specifically, the base end portion of the plate-like connecting member 34 is fixed to the surface on one side in the thickness direction of the earth plate 56 by welding. And the front-end | tip part of this connection member 34 is bend | folded suitably, and a branch part is formed, and the 4-pole connection terminal (connection part) 45 is comprised in this branch part. Further, a connector housing 46 made of resin is integrally formed with the connection member 34 so as to cover the periphery of the connection terminal 45.

  With this configuration, the weight of the ground plate 56 can be reduced, and the work of connecting the auxiliary machine ground wire with the ground bolt can be omitted, so the number of assembling work can be reduced.

  In the seventh embodiment shown in FIG. 8, crimping portions 37 are integrally formed at both ends of a ground plate 57 that is formed in an elongated and substantially rectangular shape. Then, the insulating coating is stripped off at an appropriate length at the end of the electric wire 21, and the exposed conductor 23 is crimped by the caulking portion 37. Thereby, the electric wire 21 is fixed to the ground plate 57, and the conductor 23 and the ground plate 57 are electrically connected. In the configuration of the seventh embodiment, the wire terminals 26 and the fixing screws 27 of the fifth and sixth embodiments can be omitted, so that the weight can be reduced and the number of parts and the number of assembly steps can be further reduced. .

  In the eighth embodiment shown in FIG. 9, a waterproof cover 48 made of synthetic resin is provided so as to cover the ground plate 58. This waterproof cover 48 is configured in a split shape, and a seal portion (not shown) is provided on the joint surface of each waterproof cover 48. By bonding the half-divided waterproof covers 48 to each other, the ground plate 58 (the ground point portion 6) can be covered and protected from moisture intrusion.

  In this configuration, since the battery 11 connected to one end of the trunk line 1 is arranged in the engine room as described above, when water is applied to the electric wire 21, the end of the electric wire covering of the electric wire 21 is caused by a temperature difference from the engine room. There is a possibility that water is sucked into the inside from the part and the inner conductor is corroded. In this respect, by covering the ground plate 58 with the waterproof cover 48 as in the present embodiment in a place where water may be splashed, corrosion of the electric wire 21 due to water suction can be avoided. In recent years, aluminum is sometimes used for the conductors of electric wires to reduce the weight. However, due to the waterproofing effect, aluminum and copper having a large potential difference between the ground plate 58 and the electric wires 21 or the connection portion of the earth wires. Thus, the so-called contact corrosion of different metals can be prevented.

  As described above, in the vehicle ground wiring structure of the present embodiment, the ground point portion 6 (ground plate 58) is covered with the waterproof cover 48.

  With this configuration, it is possible to prevent the ground point portion 6 from being splashed with water, so that corrosion of the conductor 23 of the electric wire 21 constituting the trunk line 1 can be prevented. In addition, it is possible to prevent the contact corrosion of dissimilar metals when the ground point portion 6 has, for example, a joint portion of aluminum and copper.

  In the ninth embodiment shown in FIG. 10, an engine control unit (ECU) 49 as an auxiliary machine is installed on one surface of the ground plate 59. Thus, by directly installing the ECU 49 on the ground plate 59, the casing (reference potential member) of the ECU 49 is electrically connected to the ground plate 59. Further, the heat generated by the ECU 49 can be effectively dissipated through the ground plate 59, and damage to the equipment can be prevented by this heat dissipating effect.

  Further, in the present embodiment, the ground plate 59 is provided so as to embed the heat pipe 47 therein, and the fin 50 is attached to the surface on one side in the thickness direction, so that a further excellent heat dissipation effect is realized. ing. In addition, since it is possible to prevent a sudden temperature change from occurring in a portion where the casing of the ECU 49, the ground wire, and the wire 21 are connected to the ground plate 59, the reliability of electrical connection can be greatly improved.

  As described above, in the vehicle ground wiring structure according to the present embodiment, the ground plate 59 includes the heat pipe 47 and the fins 50.

  With this configuration, even if heat is generated due to the concentrated current flowing in the earth point portion 6, heat can be easily radiated by the heat pipe 47 and the fin 50. Further, by directly installing the ECU 49 as an auxiliary machine that generates a large amount of heat on the ground plate 59, the ECU 49 itself can be cooled.

  In the wiring structure of the tenth embodiment shown in FIG. 11, a bus bar 61 as a conductor of the trunk line 1 is installed in the vehicle body 10. The bus bar 61 is formed in an elongated shape, and has a configuration in which a plurality of ground point portions 6 are provided at appropriate intervals in the middle in the longitudinal direction.

  The earth point unit 6 is configured to be able to connect the earth wire 7 from the auxiliary machine. In addition, a connection line 62 made of an electric wire drawn from the negative terminal 12 of the battery 11 is connected to the ground point portion 6 at an appropriate position. Thereby, the bus bar 61 is electrically connected to the negative electrode terminal 12 of the battery 11.

  As a specific configuration of the earth point portion 6, for example, it is conceivable to form the screw-in type earth hole 28 as described in the fifth embodiment in the bus bar 61. As a result, as in the above-described embodiment, it is possible to obtain ground from an arbitrary place near the auxiliary machine.

  As described above, in the vehicle ground wiring structure of the present embodiment, the conductor of the trunk line 1 is constituted by the bus bar 61, and a plurality of earth point portions 6 are arranged on the bus bar 61.

  With this configuration, the ground wire 7 from the auxiliary machine can be connected to an arbitrary ground point among the plurality of ground point portions 6 installed on the bus bar 61. Therefore, the ground side wiring can be effectively simplified. Further, the bus bar 61 can easily form the ground point portion 6 by forming the ground hole at an arbitrary position, for example, so that the wiring layout is such that a large number of ground point portions 6 are formed to connect the auxiliary machines in a distributed manner. Can also be realized easily.

  The preferred embodiments of the present invention have been described above, but the above configuration can be modified as follows, for example.

  The position (position of the earth plate 5) and the number of arrangement of the earth point portion 6 on the main line 1 can be appropriately changed according to circumstances. Further, it is only necessary that a plurality of earth point portions 6 are formed in the middle in the longitudinal direction of the main line 1, and it does not matter whether the earth plate 5 is arranged at the end of the main line 1 as shown in FIG. 1.

  The shapes of the ground plates 51 to 59 shown in FIGS. 2 to 10 can be changed as appropriate, and can be configured in a block shape, for example, instead of a plate shape.

  For example, instead of the joint connector 41 shown in FIG. 3, it is possible to change to a configuration in which the ground plate includes connector terminals, tab terminals, and the like having a simple shape.

  In the ground plate 59 of FIG. 10, either the heat pipe 47 or the fin 50 can be omitted.

  The vehicle ground wiring structure of the above embodiment can be applied not only to a so-called sports car but also to other types of vehicles as long as it has a non-body ground wiring structure.

The figure which shows notionally the ground wiring structure for vehicles of 1st Embodiment of this invention. The perspective view which shows the structure of the earth point part periphery in 1st Embodiment. The perspective view which shows the structure of the earth point part periphery in 2nd Embodiment. The perspective view which shows the structure of the earth point part periphery in 3rd Embodiment. The perspective view which shows the structure of the earth point part periphery in 4th Embodiment. The perspective view which shows the structure of the earth point part periphery in 5th Embodiment. The perspective view which shows the structure of the earth point part periphery in 6th Embodiment. The perspective view which shows the structure of the earth point part periphery in 7th Embodiment. The perspective view which shows the structure of the earth point part periphery in 8th Embodiment. The perspective view which shows the structure of the earth point part periphery in 9th Embodiment. The figure which shows notionally the earth wiring structure for vehicles of 10th Embodiment.

Explanation of symbols

1 Trunk line 5 Ground plate (metal member)
6 Ground point portion 7 Ground wire 10 Vehicle body 11 Battery 12 Negative electrode terminal 21 Electric wire 22 Strip portion 23 Conductor 28 Ground hole (screw hole)
32 Auxiliary equipment connection (connection)
45 Connection terminal (connection part)
47 Heat pipe 48 Waterproof cover 50 Fin 51-59 Earth plate (metal member)
61 Bus bar (conductor)

Claims (10)

In the vehicle ground wiring structure for electrically connecting the reference potential member of the auxiliary machine or the ground wire drawn from the reference potential member to the negative terminal of the battery without passing through the vehicle body,
An elongated trunk comprising a conductor disposed in the vehicle and electrically connected to the negative terminal of the battery;
A plurality of ground point portions that are arranged in the longitudinal direction of the trunk line and to which the reference potential member or the ground wire can be attached;
A ground wiring structure for a vehicle, comprising: The vehicle ground wiring structure according to claim 1,
The trunk line includes an electric wire,
A ground wiring structure for a vehicle, wherein the ground point portion is disposed on a metal member formed in a plate shape or a block shape. The vehicle ground wiring structure according to claim 2,
A strip portion is formed in the middle in the longitudinal direction of the electric wire,
A ground wiring structure for a vehicle, wherein the strip-shaped metal member is attached to the strip portion. The vehicle ground wiring structure according to claim 2,
The trunk wire is constituted by connecting ends of a plurality of electric wires by the metal member, and the ground wiring structure for vehicles. The vehicle ground wiring structure according to any one of claims 2 to 4,
The plate-shaped metal member includes an elongated connection part for attaching the reference potential member of the auxiliary machine or the ground wire,
The connecting portion is arranged so that the longitudinal direction thereof is along the axial direction of the conductor of the electric wire. A vehicle ground wiring structure according to any one of claims 2 to 5,
The ground wiring structure for a vehicle, wherein the metal member includes a heat pipe or a fin. The vehicle ground wiring structure according to claim 1,
The trunk wiring conductor is a bus bar, and a plurality of ground point portions are disposed on the bus bar. The vehicle ground wiring structure according to any one of claims 1 to 7,
A ground wiring structure for a vehicle, wherein a connection terminal for connecting the reference potential member of the auxiliary machine or the ground wire is arranged at the ground point portion. The vehicle ground wiring structure according to any one of claims 1 to 8,
A ground wiring structure for a vehicle, wherein a screw hole is formed in the ground point portion. The vehicle ground wiring structure according to any one of claims 1 to 9,
A ground wiring structure for a vehicle, wherein the ground point portion is covered with a waterproof cover.

Images