JP2007131086A - Grounding unit for vehicle, and grounding method for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grounding unit for vehicle which can contribute to a reduction in the kinds of parts. <P>SOLUTION: This grounding unit 30 for vehicle grounds an instrument 10 having a conductive housing 11 to a car body 2. By the grounding unit 30 for vehicle, a conductive member 31 which is attached to a wire harness 20 is fixed to the housing 11 of the instrument 10 by a first fixing member 32, and at the same time, is fixed by a second fixing member 33 to the car body 2. Therefore, the housing 11 of the instrument 10 can be grounded to the car body 2 through the conductive member 31 which is attached to the wire harness 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicular grounding unit and a vehicular grounding method, and more particularly to a vehicular grounding unit and a vehicular grounding method for grounding an electric device mounted on the vehicle to a vehicle body.

  In vehicles, electromagnetic waves are generated from the electric motor when the driving current changes suddenly, such as when switching the motor driving current for an electric motor used in an engine, rear wheel steering device, etc., or when switching the driving current in pulse width modulation (PWM) control. In this case, if the housing is not completely grounded, or if the housing cannot be shielded by the capacity of the housing or the like, the housing becomes an antenna and noise is generated.

When noise is generated, there is a problem that the radio is mounted on the vehicle and it may be difficult to hear the radio. In order to solve this problem, in Cited Document 1, the housing containing the electric motor is grounded to the vehicle body, so that the housing is grounded to a conductive large-capacity object called the vehicle body, and the electric motor is shielded by the housing. As a result, the mixing of noise into the radio mounted on the vehicle has been reduced.
JP 11-59472 A

  However, although the housing and the vehicle body described above were grounded using a grounding member such as a short conductive wire (cable bond) rich in elasticity, the arrangement of the engine and transmission differs depending on the type of vehicle. It was necessary to use a unique grounding member. For this reason, since it is difficult to make common grounding parts, the types of grounding parts tend to increase, and it has been difficult to reduce costs. Such a problem is a problem that also occurs in devices such as an engine, a battery, and a transmission that are mounted on a vehicle and have a housing made of a conductive member and are grounded to the vehicle body.

  Therefore, in view of the above-described problems, an object of the present invention is to provide a vehicular grounding unit and a vehicular grounding method that can contribute to reducing the types of components.

  In order to solve the above-mentioned problems, the vehicle grounding unit according to the present invention is a grounding unit for a vehicle that grounds a device having a conductive housing to the vehicle body, and extends between the device and the vehicle body. A conductive member attached to the wired wiring harness, a conductive first fixing member that fixes the conductive member to the housing, and a conductive second member that fixes the conductive member to the vehicle body. And a fixing member.

  According to the vehicle grounding unit of the present invention described in claim 1, the conductive member attached to the wire harness is fixed to the housing of the device by the first fixing member, and is attached to the vehicle body by the second fixing member. Since it is fixed, the device is grounded to the vehicle body via the conductive member attached to the wire harness.

  According to a second aspect of the present invention, there is provided the vehicle grounding unit according to the first aspect, wherein at least one of the first fixing member and the second fixing member includes the conductive member. It has an electroconductive fixing | fixed part fixed to the said wire harness, and an electroconductive attachment part which attaches this fixing | fixed part to the said housing or the said vehicle body detachably.

  According to the vehicle grounding unit of the present invention described in claim 2, when at least one of the first fixing member or the second fixing member fixes the conductive member to the wire harness by the fixing portion, the fixing portion is attached. By being attached to the part, it is fixed to the housing or the vehicle body.

  According to a third aspect of the present invention, there is provided a vehicle grounding unit according to the first or second aspect, wherein the conductive member has a bellows-shaped cylindrical portion, and the inside of the cylindrical portion is formed. The wire harness is inserted.

  According to the vehicle grounding unit of the present invention described in claim 3, the conductive member is attached to the wire harness inserted into the cylindrical portion. The conductive member is fixed to the housing by the first fixing member and to the vehicle body by the second fixing member.

  The vehicle grounding method according to claim 4, which is made according to the present invention to solve the above-mentioned problem, is a vehicle grounding method for grounding a device having a conductive housing to a vehicle body, and extends between the device and the vehicle body. A conductive member is attached to the wired wiring harness, and the conductive member is fixed to the housing of the device with a conductive first fixing member, and is fixed to the vehicle body with a conductive second fixing member. It is characterized by that.

  According to the vehicle grounding method of the present invention as set forth in claim 4, when the conductive member is attached to the wire harness, the conductive member is fixed to the housing of the device by the first fixing member, and is attached to the vehicle body by the second fixing member. Since it is fixed, the device can be grounded to the vehicle body by the conductive member attached to the wire harness.

  As described above, according to the first or fourth aspect of the present invention, the conductive member is attached to the wire harness routed between the vehicle body and the device, and the conductive member is made conductive first. Since the fixing member is fixed to the housing of the device and the conductive second fixing member is fixed to the vehicle body, the housing can be grounded to the vehicle body via the conductive member attached to the wire harness. . Therefore, since it is not necessary to facilitate multiple types of grounding members according to the vehicle type, grounding location, etc., it is possible to reduce the types of parts and the number of parts in producing multiple types of vehicles, Can be shared, which can contribute to a reduction in production costs.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, at least one of the first fixing member or the second fixing member is a conductive fixing that fixes the conductive member to the wire harness. And a conductive attachment part that is detachably attached to the housing or the vehicle body, so that the conductive member can be fixed to the housing or the vehicle body simply by attaching the fixation part to the attachment part. Therefore, grounding work or the like is unnecessary, and the number of assembling steps can be reduced.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the conductive member is provided with the bellows-like tube portion, and the wire harness is inserted into the tube portion. Therefore, it is possible to prevent the occurrence of defects such as the surface of the wire harness being polished and damaged by the conductive member. In addition, since the wire harness can be protected, the attachment position of the conductive member with respect to the wire harness can be given a degree of freedom, which can contribute to a reduction in design man-hours and the like.

  Hereinafter, an embodiment of a vehicle grounding unit according to the present invention will be described with reference to the drawings of FIGS. Here, FIG. 1 is a schematic view for explaining an example of a schematic configuration when the vehicle grounding unit according to the present invention is used in a vehicle, and FIG. 2 is a perspective view showing an appearance of the vehicle grounding unit of FIG. FIG. 3 is an enlarged partial cross-sectional view when the vehicle ground unit of FIG. 2 is attached to the housing.

  1 to 3, a vehicle 1 includes a plurality of devices 10 such as an engine 10A, a transmission 10B, and a battery 10C that are well-known, and a wire harness 20 that is connected to these devices 10 and is routed in the vehicle 1. The vehicle grounding unit 30 according to the present invention for grounding these devices 10 to the vehicle body 2 of the vehicle 1 is provided. As is well known, the vehicle body 2 is a portion that forms the outer surface other than the prime mover and the wheels, and is formed of a conductive metal member.

  Each device 10 of the engine 10A, the transmission 10B, and the battery 10C has a housing 11 made of a conductive member such as metal. In addition, about the housing 11, all or one part is formed with the electroconductive material.

  The wire harness 20 has a plurality of electric wires 21 and connectors (not shown) attached to the ends of the electric wires, etc., and the device 10 is controlled by electric power from a power source or a computer. It conveys signals. The electric wire includes a conductive core wire and a covering portion made of an insulating synthetic resin that covers the core wire.

  The vehicle ground unit 30 includes a conductive member 31 attached to a wire harness routed between the device 10 and the vehicle body 2, and a conductive member that fixes the conductive member 31 to the housing 11 of the device 10. And a conductive second fixing member 33 that fixes the conductive member 31 to the vehicle body 2.

  The conductive member 31 is formed of a conductive linear material such as a metal wire in a net shape around the wire harness 20. The attachment range of the conductive member 31 to the wire harness 20 is set to be slightly longer than the distance between the fixed positions from the housing 11 to the vehicle body 2 of the device 10. About formation of the electroconductive member 31, it can be set as various different forms, such as winding in the predetermined range of the wire harness 20 previously, and winding after wiring with respect to the vehicle 1 of the wire harness 20.

  Each of the first fixing member 32 and the second fixing member 33 includes a conductive fixing portion 34 that fixes the conductive member 31 to the wire harness 20, and the fixing portion 34 is attached to and detached from the housing 11 or the vehicle body 2. And a conductive attachment portion 35 to be freely attached.

  The fixing part 34 includes a ring-shaped first ring part 34A through which the wire harness 20 is inserted, a ring-shaped second ring part 34B having an inner diameter slightly larger than the outer diameter of the first ring part 34A, and a second ring. It has a base part 34C provided continuously with the part 34B, and an insertion hole 34D provided in the base part 34C and into which the mounting part 35 is inserted.

  The attachment portion 35 includes an abutment portion 35A that is fixed to the housing 11 or the vehicle body 2 with a screw 36 and an attachment piece 35B that is erected from the contact portion 35A. is doing. The contact portion 35A and the attachment piece 35B are formed by bending a conductive metal plate into a substantially L shape, and the width of the contact portion 35A is wider than the width of the attachment piece 35B.

  A hole (not shown) through which the screw 36 passes is formed in the center of the contact portion 35A, and the screw 36 passing through the hole is attached to the vehicle body 2 or the housing 11 so as to overlap the vehicle body 2 or the housing 11. Thus, the attachment portion 35 is fixed to the vehicle body 2 or the housing 11. Note that the attachment portion 35 can be formed in various different forms such as being formed integrally with the vehicle body 2 or the housing 11 in advance or being welded. In particular, by forming the mounting portion 35 integrally with the vehicle body 2 or the housing 11 in advance, the mounting work of the mounting portion 35 becomes unnecessary, which can contribute to a reduction in assembly man-hours.

  Further, a well-known ball plunger is provided on the inner surface of the insertion hole 34D, and the fixing portion 34 is prevented from coming off by being fitted into a recess provided in the mounting piece 35B inserted into the insertion hole 34D. It has become.

  Next, an example of attaching the vehicle grounding unit 30 to the vehicle 1 will be described. When the ring-shaped protection member 37 made of an elastic member or the like is attached to a predetermined position of the wire harness 20, the first ring portion 34 </ b> A is attached on the protection member 37. In addition, the predetermined position in this best form has shown a pair of position corresponding to the said attaching part 35 on the wire harness 20. FIG.

  When the conductive member 31 covers the wire harness 20 so as to cover the first ring portions 34A of both the first fixing member 32 and the second fixing member 33, the second ring portions 34B are fitted to the first ring portions 34A. Thus, the conductive member 31 is sandwiched between the first ring portion 34A and the second ring portion 34B, and the conductive member 31, the first fixing member 32, and the second fixing member 33 are electrically connected. The Then, both end portions of the conductive member 31 are folded back so as to cover a part of the respective surfaces of the first fixing member 32 or the second fixing member 33.

  When the wire harness 20 is routed in the vehicle 1, the attachment piece 35B of the attachment portion 35 provided in the housing 11 of the device 10 is moved in the direction of the arrow X in FIG. As a result, the conductive member 31 and the wire harness 20 are fixed to the housing 11. Similarly, the attachment piece 35B of the attachment portion 35 provided in the vehicle body 2 is moved in the direction of arrow X in FIG. 2 and inserted into the insertion hole 34D of the fixing portion 34, whereby the conductive member 31 is attached to the vehicle body 2. And the wire harness 20 is fixed.

  Thereby, electromagnetic waves, static electricity, etc. generated from the housing 11 are generated in the housing 11, the mounting portion 35 and the fixing portion 34 of the first fixing member 32, the conductive member 31, the fixing portion 34 and the mounting portion 35 of the second fixing member 33, It is absorbed by the grounding path L shown in FIG. And in this best form, the assembly | attachment operation | work mentioned above is performed with respect to each of engine 10A, transmission 10B, and battery 10C.

  According to the vehicle grounding unit 30 described above, the conductive member 31 is attached to the wire harness 20 routed between the vehicle body 2 and the device 10, and the conductive member 31 is connected to the conductive first fixing member. 32 is fixed to the housing 11 of the device 10 and fixed to the vehicle body by the conductive second fixing member 33, the housing 11 is attached to the vehicle body 2 via the conductive member 31 attached to the wire harness 20. Can be grounded. Therefore, since it is not necessary to facilitate a plurality of types of grounding members according to the vehicle type, the grounding location, etc., the types of components and the number of components can be reduced in producing a plurality of types of vehicles 1, Since parts can be shared, it can contribute to the reduction of production costs.

  The first fixing member 32 and the second fixing member 33 include a conductive fixing portion 34 that fixes the conductive member 31 to the wire harness 20, and a conductive member that detachably attaches the fixing portion 34 to the housing 11 or the vehicle body 2. Since the conductive member 31 can be fixed to the housing 11 or the vehicle body 2 simply by mounting the fixing portion 34 to the mounting portion 35, the grounding work or the like can be performed. This eliminates the need for assembly work.

  In the above-described best mode, the conductive member 31 is formed of a conductive linear material in a net shape. However, the present invention is not limited to this, and may be variously different. it can.

  For example, the conductive member 31 may be provided with a bellows-like tube portion, and the wire harness 20 may be inserted into the tube portion. A known grommet is made conductive, and the grommet is fixed in a state where it is electrically connected to the housing 11 and the vehicle body 2 by the first fixing member 32 and the second fixing member 33 as described above. That is, a conductive grommet can be used as the conductive member 31.

  In this way, it is possible to prevent the occurrence of problems such as the surface of the wire harness 20 being polished and damaged by the conductive member 31. In addition, since the wire harness 21 can be protected, the attachment position of the conductive member with respect to the wire harness can be given a degree of freedom, which can contribute to a reduction in design man-hours and the like.

  Moreover, a conductive core wire can be formed on the surface of the wire harness 20, or a guide can be formed on the surface of a well-known resin grommet to provide an electric wire or a conductive core wire. Even if the conductive member is configured in this way, the best of the above-described method can be obtained by fixing the first fixing member 32 and the second fixing member 33 to the electric wire or the conductive core wire while being electrically connected. The same effect as the form can be obtained.

  In the above-described best mode, the case where the first fixing member 32 and the second fixing member 33 are fixed to the vehicle body 2 or the housing 11 by mounting the fixing portion 34 and the mounting portion 35 has been described. If the member 31 can be fixed in a state where the first fixing member 32 and the second fixing member 33 are electrically connected, for example, the conductive member 31 may be sandwiched by a pair of abutting pieces, and various forms may be adopted. it can.

  Furthermore, if the vehicle grounding unit described above is a device having a conductive housing, the above-described effects can also be obtained for devices such as a switch device mounted on a vehicle door. And when using for a switch apparatus, the grounding unit 30 for vehicles is provided so that a door and the vehicle body 2 may be straddled, and the housing of apparatuses, such as a switch apparatus provided in the door, is grounded to the vehicle body 2. FIG.

It is a schematic diagram for demonstrating an example of schematic structure when the ground unit for vehicles which concerns on this invention is used for a vehicle. It is a perspective view which shows the external appearance of the vehicle ground unit of FIG. FIG. 3 is an enlarged partial cross-sectional view when the vehicle ground unit of FIG. 2 is attached to a housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car body 10 Apparatus 11 Housing 20 Wire harness 30 Grounding unit 31 for vehicles 31 Conductive member 32 1st fixing member 33 2nd fixing member 34 Fixing part 35 Attachment part

Claims (4)

A vehicle grounding unit for grounding a device having a conductive housing to a vehicle body,
A conductive member attached to a wire harness routed between the device and the vehicle body;
A conductive first fixing member for fixing the conductive member to the housing;
A conductive second fixing member for fixing the conductive member to the vehicle body;
A vehicle grounding unit characterized by comprising:   At least one of the first fixing member or the second fixing member includes a conductive fixing portion that fixes the conductive member to the wire harness, and a conductive member that removably attaches the fixing portion to the housing or the vehicle body. And a vehicle grounding unit.   The vehicle grounding unit according to claim 1 or 2, wherein the conductive member has a bellows-like cylindrical portion, and the wire harness is inserted through the cylindrical portion. A vehicle grounding method for grounding a device having a conductive housing to a vehicle body,
A conductive member is attached to a wire harness routed between the device and the vehicle body, the conductive member is fixed to the housing of the device with a conductive first fixing member, and the conductive material is conductive to the vehicle body. The grounding method for vehicles characterized by fixing with the 2nd fixing member of this.

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