JP5429347B2 - Vehicle electromagnetic shield structure - Google Patents

Description

  The present invention relates to an electromagnetic shield structure for a vehicle having an electric device such as a traveling motor such as an electric vehicle or a hybrid vehicle.

Vehicles that use electricity as a power source, such as electric vehicles and hybrid vehicles, are equipped with a motor for traveling. In a vehicle equipped with such a motor, DC power supplied from a traveling battery is converted into AC power by an inverter. In addition, electromagnetic shielding measures have been taken to shield electromagnetic waves generated from electric devices such as motors and inverters. Alternatively, electromagnetic shielding measures are also required to prevent external electromagnetic waves from reaching the control electric cable. For example, as a means for electromagnetically shielding a control cable connecting an inverter and a motor, a shielded cable in which a net-like shield member is embedded in an insulator covering a conductor of the cable is known. As means for electromagnetically shielding a cable without using a shielded cable, means such as passing a cable through a metal protective pipe has been proposed (for example, see Patent Document 1 below).
JP 2004-224156 A

  A cable having a detachable connector may be used to connect electrical devices such as a motor and an inverter. For example, a first electric cable connected to one electric device and a second electric cable connected to the other electric device are connected by a connector. If such a cable with a connector is used, electrical devices can be electrically separated as necessary. For example, when the motor or inverter is assembled to the vehicle body or when it is necessary to handle the motor or inverter alone for maintenance or inspection, the motor and the inverter can be made independent by separating the connectors.

  However, in the cable with the connector, when the shielded cable having a shield member embedded therein is used as the electromagnetic shielding means, the connector portion cannot be electromagnetically shielded even if the cable itself can be electromagnetically shielded. As a result, there is a problem that electromagnetic waves leak from the connector portion.

  On the other hand, in the electromagnetic shielding means of Patent Document 1, since the cable is accommodated in a specially-shaped metal protective pipe or the like, it lacks versatility, and the structure of the connecting portion between the protective pipe and the electric device is not good. There is a problem that the assembly becomes difficult and the cost becomes high, such as complexity.

  Accordingly, an object of the present invention is to provide an electromagnetic shielding structure for a vehicle that can sufficiently shield an electric cable having a connector with a simple structure.

  The present invention relates to a first electric device mounted on a vehicle, a second electric device mounted on the vehicle, and a cable insertion hole of the first electric device connected to the first electric device. The first electric cable drawn to the outside and the second electric device are connected to the second electric device. The first electric cable is drawn to the outside from the cable insertion hole of the second electric device and is attached to the first electric cable via a detachable connector. A second electric cable connected to the cable, and an electromagnetic shield member having a cylindrical portion formed by braiding a plurality of conductive wires, and covering the first and second electric cables and the connector A first pressing member that clamps one end of the electromagnetic shield member between the first electric device and a first pressing member that detachably fixes the first pressing member to the first electric device. 1 fixing member and the electromagnetic shielding member A second pressing member that sandwiches the other end between the second electric device and a second fixing member that detachably fixes the second pressing member to the second electric device. I have.

  The electromagnetic shielding member includes a first spreading portion that is detachably fixed to the first electric device by the first fixing member at the one end portion, and the second fixing portion at the other end portion. And a second spreading part that is detachably fixed to the second electric device by a member.

  The second electric cable includes a pair of cable elements, the cable elements branch in two directions in the vicinity of the cable insertion portion of the second electric device, and the second pressing member is interposed between the branched pair of cable elements. A metal fitting is disposed, and the second spreading portion of the electromagnetic shield member is sandwiched between the second pressing metal fitting and the second electric device.

  An example of the first electric device is an inverter. An example of the second electric device is a traveling motor arranged at a position lower than the inverter. The second pressing metal fitting is fixed to the vertical wall along the vertical direction of the motor by the second fixing member.

  According to the present invention, the outside of the entire length of the cable with the connector including the first and second electric cables can be covered with the electromagnetic shield member configured separately from the electric cable. The first spreading part formed at one end of the electromagnetic shield member and the second spreading part formed at the other end are respectively formed by a first pressing metal and a second pressing metal having a simple structure. It is sandwiched between each electric device and fixed. For this reason, the cable with a detachable connector can be sufficiently electromagnetically shielded using the electromagnetic shielding member and the pressing metal having a simple structure.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an electric vehicle which is an example of a vehicle 1. The vehicle 1 includes a vehicle body 10, a battery 11, an inverter 12 that is an example of a first electric device, and a motor 13 for traveling that is an example of a second electric device. The battery 11 and the inverter 12 are connected to each other by a power cable (not shown). The inverter 12 converts the DC power supplied from the battery 11 into AC power.

  As shown in FIG. 2, the inverter 12 and the motor 13 are electrically connected to each other by a power cable 14 and a control cable 15. The motor 13 is driven by frequency-controlled AC power supplied from the inverter 12 via the power cable 14. A metal conductor (not shown) is embedded in the power cable 14 as electromagnetic shielding means. That is, the power cable 14 is constituted by a shielded cable that is electromagnetically shielded. On the other hand, the control cable 15 is covered with an electromagnetic shield member 60. The electromagnetic shield member 60 will be described in detail later.

  The inverter 12 has a housing 20 made of a metal such as an aluminum alloy. As shown in FIGS. 2 and 3, the housing 20 includes a pair of side surfaces 21, 22, an end surface 23, an upper surface 24, and a bottom surface 25, and forms a sealed watertight structure. A cable insertion portion 30 is provided in the vicinity of the corner portion 26 where the end surface 23 and the bottom surface 25 intersect. The cable insertion part 30 includes a cable insertion hole 31 (shown in FIG. 3) through which the first electric cable 41 passes and a portion around the cable insertion hole 31 (a part of the housing 20). A hole 32 (shown in FIG. 3) into which the first fixing member 71 is inserted is formed in the bottom surface 25 of the housing 20.

  FIG. 4 shows a state before the electromagnetic shield member 60 is put on the control cable 15. The control cable 15 includes a first electric cable 41 connected to the inverter 12, a second electric cable 42 connected to the motor 13, and a connector 43 that connects these electric cables 41, 42. Yes. The connector 43 includes a plug 51 and a receptacle 52 that are detachable from each other.

  The first electric cable 41 is drawn out from the cable insertion portion 30 of the inverter 12 to the outside. The second electric cable 42 is drawn out from the cable insertion portion 90 of the motor 13 to the outside. In a state where the plug 51 and the receptacle 52 are fitted to each other, the first electric cable 41 and the second electric cable 42 are electrically connected. The thicknesses (outer dimensions) of the plug 51 and the receptacle 52 are larger than the outer diameters of the first electric cable 41 and the second electric cable 42. The first electric cable 41, the second electric cable 42, and the connector 43 are covered with an electromagnetic shield member 60.

  The electromagnetic shield member 60 includes a cylindrical portion 62 formed by braiding a plurality of strands 61 made of a conductive material into a tube shape, and first spreads formed at both ends 63 and 64 in the longitudinal direction of the electromagnetic shield member 60. A portion 65 and a second spreading portion 66 are included. The electromagnetic shield member 60 has flexibility, can be bent, and can be compressed or stretched in the longitudinal direction. It is also possible to expand the electromagnetic shield member 60 to some extent. The inner diameter of the cylindrical portion 62 is larger than the thickness (outer dimensions) of the plug 51 and the receptacle 52.

  The first expanding portion 65 is formed by expanding one end portion 63 of the electromagnetic shield member 60 so that the width is larger than that of the cylindrical portion 62. The second expanding portion 66 is formed by expanding the other end portion 64 of the electromagnetic shield member 60 so that the width is larger than that of the cylindrical portion 62.

  The first spreading portion 65 of the electromagnetic shield member 60 is fixed to the cable insertion portion 30 of the inverter 12 by the first presser fitting 70 and the first fixing member 71. The first pressing metal fitting 70 has a base 72 and a pair of pressing pieces 73 and 74. The base 72 is fixed to the bottom surface 25 of the inverter 12 from below by the first fixing member 71. An example of the first fixing member 71 is a bolt, but a fixing member other than the bolt may be used. The pair of pressing pieces 73 and 74 are bent in a direction that forms an angle θ with respect to the base portion 72 and extend in parallel to each other. A distance W <b> 1 (shown in FIG. 6) between the pressing pieces 73 and 74 is larger than the diameter of the first electric cable 41.

  As shown in FIG. 6, a pair of holes 75 are formed in the base portion 72. The distance between the holes 75 is the same as the distance between the holes 32 provided on the bottom surface 25 of the inverter 12. The first fixing member 71 is inserted into the hole 75.

  The first presser fitting 70 is made of a metal plate having a spring property, and an angle θ formed by the base 72 and the pressing pieces 73 and 74 is 90 in a free state before being fixed to the inverter 12 as shown in FIG. It is bent so as to be less than the degree. The angle formed between the end face 23 and the bottom face 25 of the inverter 12 is substantially a right angle (90 degrees). Therefore, in a state where the base 72 is fixed to the bottom surface 25 of the inverter 12 by the first fixing member 71, the pressing pieces 73 and 74 are indicated by a two-dot chain line in FIG. Elastic deformation from the initial position N to nearly 90 degrees. Due to the repulsive load of the pressing pieces 73 and 74, the pressing pieces 73 and 74 are biased toward the end surface 23 of the inverter 12.

  FIG. 3 is a perspective view of the inverter 12 as viewed from below. FIG. 5 is an enlarged side view showing a part of the inverter 12 and the electromagnetic shield member 60. A first spreading portion 65 of the electromagnetic shield member 60 is sandwiched between the first presser fitting 70 and the inverter 12. The first spreading portion 65 is flattened according to the shape of the cable insertion portion 30 by the first presser fitting 70. The base 72 of the first presser fitting 70 is detachably fixed to the bottom surface 25 of the inverter 12 by the first fixing member 71.

  That is, the first spreading portion 65 of the electromagnetic shield member 60 is deformed according to the shape of the corner portion 26 between the bottom surface 25 and the end surface 23 of the inverter 12 and is crushed by the first pressing metal fitting 70. Yes. The first spreading portion 65 is fixed to the casing 20 of the inverter 12 by the first fixing member 71, and almost the entire circumference of the first spreading portion 65 is in contact with the casing 20 of the inverter 12.

  The motor 13 includes a housing 80 made of a metal such as an aluminum alloy. The output shaft 81 of the motor 13 is coupled to a power transmission mechanism (not shown). A cable insertion portion 90 is provided at a lower portion of the vertical wall 82 along the vertical direction of the housing 80. The cable insertion portion 90 includes a cable insertion hole 91 through which the second electric cable 42 passes and a portion around the cable insertion hole 91 (a part of the housing 80). A hole 92 for screwing the second fixing member 101 is formed in the vertical wall 82.

  The motor 13 is controlled by a control signal supplied via the control cable 15. The motor 13 is disposed at a position lower than the inverter 12. The other end portion 64 of the electromagnetic shield member 60 is held by the cable insertion portion 90 of the motor 13 by the second presser fitting 100 and the second fixing member 101. An example of the second fixing member 101 is a bolt, but a fixing member other than the bolt may be used.

  FIG. 7 is a perspective view of the motor 13 as viewed from above. The second electric cable 42 is drawn out from the cable insertion portion 90 of the motor 13. The second electric cable 42 is covered with the electromagnetic shield member 60 described above. The second electric cable 42 includes a pair of cable elements 111 and 112. These cable elements 111 and 112 are bifurcated in the vicinity of the cable insertion portion 90. A second presser fitting 100 is disposed between the branched cable elements 111 and 112.

  A second spreading portion 66 of the electromagnetic shield member 60 is sandwiched between the second presser fitting 100 and the vertical wall 82 along the vertical direction of the motor 13. The second spreading portion 66 is deformed according to the shape of the cable insertion portion 90 of the motor 13 and is flattened. The second presser fitting 100 is fixed to a vertical wall 82 along the vertical direction of the motor 13 by a second fixing member 101.

  FIG. 8 shows the second presser fitting 100. The second presser fitting 100 is formed by forming a metal plate into a substantially triangular shape. The angle α of the corner portion 102 is approximately the same as the angle formed by the cable elements 111 and 112 in the cable insertion portion 90 of the motor 13. The second pressing metal fitting 100 is disposed between a pair of branched cable elements 111 and 112 and is detachably fixed to a vertical wall 82 along the vertical direction of the motor 13 by a second fixing member 101.

  The second pressing metal fitting 100 has a pressing surface in contact with the electromagnetic shield member 60. The pressing surface may be a smooth flat surface. For example, in order to make the second spreading portion 66 of the electromagnetic shielding member 60 difficult to slip, the pressing surface is formed as a rough surface having projections or depressions or by forming protrusions. It is preferable that the second spreading portion 66 is surely stopped.

The operation and effect of the electromagnetic shield structure provided with the electromagnetic shield member 60, the first pressing metal fitting 70, and the second pressing metal fitting 100 will be described below.
As shown in FIG. 4, when the plug 51 and the receptacle 52 of the connector 43 are separated, the longer one of the first electric cable 41 and the second electric cable 42, for example, the first electric cable 41 is electromagnetically shielded. Insert into member 60. In this case, the first electric cable 41 is inserted while the electromagnetic shield member 60 is contracted in the longitudinal direction. Then, the plug 51 of the connector 43 is exposed from the other end portion 64 of the electromagnetic shield member 60. After connecting the plug 51 to the receptacle 52, the other end 64 side of the electromagnetic shield member 60 is moved toward the motor 13.

  In this way, the first electric cable 41, the second electric cable 42, and the connector 43 can be covered with the electromagnetic shield member 60. Then, the first spreading portion 65 of the electromagnetic shield member 60 is fixed to the cable insertion portion 30 of the inverter 12 by the first pressing metal fitting 70 and the first fixing member 71. Further, the second spreading portion 66 of the electromagnetic shield member 60 is fixed to the cable insertion portion 90 of the motor 13 by the second pressing metal 100 and the second fixing member 101.

  When it becomes necessary to separate the inverter 12 and the motor 13 for maintenance inspection and repair, the second fixing member 101 and the second pressing metal fitting 100 are removed from the cable insertion portion 90 of the motor 13 contrary to the above. Then, by moving the other end 64 of the electromagnetic shield member 60 toward the inverter 12, the connector 43 is exposed and the plug 51 and the receptacle 52 are separated. Thus, the connector 43 can be attached and detached by moving the electromagnetic shield member 60 in the longitudinal direction.

  The electromagnetic shield member 60 can completely shield the entire length of the control cable 15 and the connector 43 from the cable insertion portion 30 of the inverter 12 to the cable insertion portion 90 of the motor 13. Further, the widened portions 65 and 66 formed at both end portions 63 and 64 of the electromagnetic shield member 60 can be deformed, and can be deformed according to the shapes of the cable insertion portion 30 of the inverter 12 and the cable insertion portion 90 of the motor 13. it can. Thereby, it can avoid that a leak arises in an electromagnetic shield in the cable insertion part 30 of the inverter 12. FIG. Further, it is possible to avoid leakage of the electromagnetic shield in the cable insertion portion 90 of the motor 13.

  Further, since the spread portions 65 and 66 are formed in the one end portion 63 and the other end portion 64 of the electromagnetic shield member 60, respectively, the spread portions 65 and 66 have a wide area with respect to the inverter 12 and the motor 13. Contact. For this reason, each edge part 63 and 64 of the electromagnetic shielding member 60 can carry out electromagnetic shielding stably.

  The first spreading portion 65 is fixed to the cable insertion portion 30 of the inverter 12 by the first presser fitting 70 and the first fixing member 71. For this reason, one end 63 of the electromagnetic shield member 60 can be reliably attached to the casing 20 of the inverter 12. The second spreading portion 66 is fixed to the cable insertion portion 90 of the motor 13 by the second pressing metal fitting 100 and the second fixing member 101. Since the second fixing member 101 is fixed to the cable insertion part 90 in a state where a part of the second extension part 66 penetrates in the thickness direction, the second extension part 66 is in relation to the cable insertion part 90. The movement can be prevented by the second fixing member 101. For this reason, the other end portion 64 of the electromagnetic shield member 60 can be securely attached to the motor 13.

In carrying out the present invention, it goes without saying that the structure and arrangement of the constituent elements of the invention including the control cable, the electromagnetic shield member, the first pressing metal fitting and the second pressing metal fitting can be changed as appropriate. The electromagnetic shield structure according to the present invention may be applied to an electric cable connected to an electric device other than an inverter or a motor.
The contents of the claims at the beginning of filing of the original patent application are added below.
[1] a first electric device mounted on a vehicle;
A second electrical device mounted on the vehicle;
A first electric cable connected to the first electric device and drawn out from a cable insertion hole of the first electric device;
A second electrical cable connected to the second electrical device, drawn out from a cable insertion hole of the second electrical device, and connected to the first electrical cable via a detachable connector;
An electromagnetic shield member having a cylindrical portion formed by braiding a plurality of conductive wires, and covering the first and second electric cables and the connector;
A first pressing metal fitting for sandwiching one end of the electromagnetic shielding member with the first electric device;
A first fixing member for removably fixing the first pressing metal fitting to the first electrical device;
A second pressing metal fitting for sandwiching the other end of the electromagnetic shield member with the second electric device;
A second fixing member for removably fixing the second pressing metal fitting to the second electric device;
An electromagnetic shielding structure for a vehicle, comprising:
[2] The electromagnetic shield member includes a first spreading portion that is detachably fixed to the first electric device by the first fixing member at the one end portion, and the first end portion at the other end portion. The vehicle electromagnetic shield structure according to [1], further comprising a second spreading portion that is detachably fixed to the second electric device by two fixing members.
[3] The first presser fitting is a pair of bases that are fixed to the first electrical device by the first fixing member, and a pair that is bent in a direction that forms an angle with respect to the bases and that extends in parallel with each other. And the base is attached to the electric device by the first fixing member in a state where the first spreading portion of the electromagnetic shielding member is sandwiched between the pressing piece and the electric device. The vehicle electromagnetic shield structure according to [2], wherein the vehicle electromagnetic shield structure is fixed.
[4] The first presser fitting is made of a metal plate having a spring property, and the base and the pressing piece are formed in a state before the first presser fixture is fixed to the first electric device. In a state where the angle is smaller than 90 degrees and the first pressing metal fitting is fixed to the first electric device, the electromagnetic shield member is placed between the pair of pressing pieces and the first electric device. The vehicle electromagnetic shield structure according to [3], wherein the first spreading portion is sandwiched.
[5] The second electric cable includes a pair of cable elements, the cable elements branch in two directions in the vicinity of the cable insertion portion of the second electric device, and the first electric cable is interposed between the branched pair of cable elements. [4], wherein two presser fittings are arranged, and the second spreading portion of the electromagnetic shielding member is sandwiched between the second presser fitting and the second electric device. Vehicle electromagnetic shield structure.
[6] The first electric device is an inverter, the second electric device is a traveling motor disposed at a position lower than the inverter, and the base portion of the first presser fitting is the It is fixed to the bottom surface of the inverter from the lower side of the inverter by the first fixing member, and the second pressing metal member is fixed to the vertical wall along the vertical direction of the motor by the second fixing member. The electromagnetic shielding structure for a vehicle according to [5], which is characterized.

The perspective view of the vehicle provided with the electromagnetic shielding member which shows one Embodiment of this invention. The perspective view of an inverter, a motor, etc. which are used for the vehicle shown in FIG. The perspective view which shows a part of said inverter and electric cable. The perspective view which shows the state before attaching an electromagnetic shielding member to the said electric cable. The side view of a part of said inverter and electric cable. The perspective view of the 1st pressing metal fitting. The perspective view of a part of said motor and electric cable. The perspective view of the 2nd pressing metal fitting.

12 ... Inverter (first electrical device)
13 ... motor (second electrical device)
DESCRIPTION OF SYMBOLS 30 ... Cable insertion part 41 ... 1st electric cable 42 ... 2nd electric cable 43 ... Connector 60 ... Electromagnetic shielding member 65 ... 1st spreading part 66 ... 2nd spreading part 70 ... 1st presser fitting 71 ... First fixing member 90 ... Cable insertion portion 100 ... Second presser fitting 101 ... Second fixing member

Claims (2)

A first electrical device mounted on the vehicle;
A second electrical device mounted on the vehicle;
A first electric cable connected to the first electric device and drawn out from a cable insertion hole of the first electric device;
A second electrical cable connected to the second electrical device, drawn out from a cable insertion hole of the second electrical device, and connected to the first electrical cable via a detachable connector;
An electromagnetic shield member having a cylindrical portion formed by braiding a plurality of conductive wires, and covering the first and second electric cables and the connector;
A first pressing metal fitting for sandwiching one end of the electromagnetic shielding member with the first electric device;
A first fixing member for removably fixing the first pressing metal fitting to the first electrical device;
A second pressing metal fitting for sandwiching the other end of the electromagnetic shield member with the second electric device;
A second fixing member for removably fixing the second pressing metal fitting to the second electric device;
With
The electromagnetic shielding member includes a first spreading portion that is detachably fixed to the first electric device by the first fixing member at the one end portion, and the second fixing portion at the other end portion. And a second spreading part that is detachably fixed to the second electric device by a member,
The second electric cable includes a pair of cable elements, the cable elements branch in two directions in the vicinity of the cable insertion portion of the second electric device, and the second pressing member is interposed between the branched pair of cable elements. An electromagnetic shielding structure for a vehicle, wherein a metal fitting is disposed, and the second spreading portion of the electromagnetic shielding member is sandwiched between the second pressing metal fitting and the second electric device.   The first electric device is an inverter, the second electric device is a traveling motor disposed at a position lower than the inverter, and the second pressing metal fitting extends in the vertical direction of the motor. The electromagnetic shield structure for a vehicle according to claim 1, wherein the vehicle is fixed to a vertical wall by the second fixing member.

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