JP2012095030A - On-vehicle noise suppression filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a mounting structure and a grounding structure for an on-vehicle noise suppression filter.SOLUTION: The on-vehicle noise suppression filter includes: a harness 12 connected to an on-vehicle apparatus; a magnetic material pipe 14 having a through hole through which the harness 12 is passed; a conductive pipe 16 having a through hole through which the harness 12 is passed; a conductive plate 18 conductively connecting the conductive pipe 16 to a grounding conductive plate disposed on a vehicle body; and an armor member 20 having a column formed along the conductive plate 18 and supporting the harness 12, the magnetic pipe 14 and the conductive pipe 16 on the grounding conductive plate.

Description

  The present invention relates to a vehicle-mounted noise suppression filter, and relates to a noise suppression filter provided on a conductor wire connected to a vehicle-mounted device.

  Vehicles such as passenger cars, trucks, and buses are equipped with on-vehicle equipment such as radios, televisions, car navigation systems, and audio equipment. A vehicle-mounted device is connected with a harness in which a conductor wire is covered with an insulator in order to deliver signals and supply power.

  The harness connected to the on-vehicle equipment may generate noise due to the operation of other electrical equipment. For example, in a hybrid vehicle, an electric vehicle, or the like, noise may occur in the harness based on the operation of a switching circuit that controls power supplied to the vehicle drive motor. Further, noise may occur in the harness based on the operation of the digital device provided in the vehicle. Noise generated in the harness connected to the on-vehicle equipment affects the operation performance of the on-vehicle equipment.

  Patent Documents 1 to 7 describe techniques for reducing noise generated in conductor wires. Patent Documents 1 and 2 describe a technique for reducing noise of a conductor wire by using a magnetic body around the conductor wire. Patent Documents 3 to 6 describe an LC filter in which a magnetic body is provided around a conductor wire and a capacitor is provided between the conductor wire and a ground conductor. Patent Document 7 describes a feedthrough capacitor formed of a cylindrical conductor, and an LC filter using a coiled thin wire provided inside the feedthrough capacitor.

Japanese Utility Model Publication No. 8-972 JP 2000-331836 A JP 62-208705 A Japanese Utility Model Publication No. 2-79618 JP-A-4-369910 Japanese Examined Patent Publication No. 6-91406 Japanese Patent Laid-Open No. 7-73935

  When fixing a filter as described in Patent Documents 1 to 7 to a vehicle body, it may be necessary to separately add a fixing member. Further, depending on the configuration of the filter, wiring for grounding may be complicated.

  An object of the present invention is to simplify the mounting structure and grounding structure of a vehicle-mounted noise suppression filter.

  The present invention includes a conductor wire connected to a vehicle-mounted device, a magnetic member provided with a through-hole, through which the conductor wire passes, a conductive member provided with a through-hole, and through which the conductor wire passes, A grounding member for conductively connecting a grounding conductor plate of a vehicle body and the conductive member, and a support post formed along the grounding member, the conductor wire, the magnetic member, and the conductive member being grounded And a support member supported on the conductor plate.

  In the vehicle-mounted noise suppression filter according to the present invention, preferably, the support member has a housing portion that houses the magnetic member and the conductive member, and the support column covers the ground member. The housing portion is supported on the ground conductor plate.

  In the vehicle-mounted noise suppression filter according to the present invention, preferably, the support member is provided at a tip end portion of the support column on the ground conductor plate side, and a clip portion that forms a wedge shape with the support column, and the support column. And a fixed plate that sandwiches the ground conductor plate between the clip portion and the plate surface.

  ADVANTAGE OF THE INVENTION According to this invention, the attachment structure and grounding structure of a vehicle-mounted noise suppression filter can be simplified.

It is a perspective view of a vehicle-mounted noise suppression filter whose exterior member is indicated by a broken line. It is sectional drawing at the time of cut | disconnecting the vehicle-mounted noise suppression filter so that it may pass along the center axis | shaft of a harness. It is sectional drawing perpendicular | vertical with respect to the extending | stretching direction of a harness. It is a perspective view of the noise suppression filter for vehicle mounting. It is a figure which shows the equivalent circuit of the noise suppression filter for vehicle mounting. It is a figure which shows the noise suppression filter for vehicle mounting fixed to the earthing conductor board with the volt | bolt and the nut.

  FIG. 1 is a perspective view of a vehicle-mounted noise suppression filter 10 according to an embodiment of the present invention. In this figure, the exterior member 20 is indicated by a broken line. FIG. 2 is a cross-sectional view when the vehicle-mounted noise suppression filter 10 is cut in the vertical direction of FIG. 1 so as to pass through the central axis of the harness 12.

  The on-vehicle noise suppression filter 10 includes a harness 12, a magnetic pipe 14 through which the harness 12 penetrates, a conductive pipe 16 through which the harness 12 penetrates, and a conductive pipe 16 electrically connected to a ground conductor plate 26 provided on the vehicle body. And an exterior member 20 that covers these components. The exterior member 20 also has a function as a support member that supports these components on the ground conductor plate 26.

  The harness 12 includes a conductor wire 22 and an insulator 24 that covers the conductor wire 22. The conductor wire 22 may be a bundle of a plurality of core wires. Further, a dielectric such as rubber or plastic resin can be used for the insulator 24 covering the conductor wire 22. One end or both ends of the harness 12 is connected to a vehicle-mounted device such as a radio, a television, a car navigation system, or an audio device.

  The magnetic pipe 14 is a magnetic member in which a through hole is provided in a soft magnetic material such as ferrite. The conductive pipe 16 is a conductive member in which a through hole is provided in a conductor such as iron, copper, or aluminum. These are formed in a pipe shape, that is, in a cylindrical shape, but may be formed in a rectangular parallelepiped having a through hole or other three-dimensional shape. The magnetic material pipe 14 and the conductive pipe 16 are arranged so that one end of each through hole faces each other, and the harness 12 is arranged so that the harness 12 can be inserted from one through hole to the other through hole.

  FIG. 2 shows a configuration in which a gap is provided between the inner wall of the through hole of the magnetic pipe 14 and the insulator 24 of the harness 12, but the inner wall of the through hole of the magnetic pipe 14 and the harness 12 are shown. The insulator 24 may be in close contact. 2 shows a configuration in which the inner wall of the through hole of the conductive pipe 16 and the insulator 24 of the harness 12 are in close contact, the inner wall of the through hole of the conductive pipe 16 and the insulator of the harness 12 are shown. There may be a gap between the two.

  FIG. 3 is a cross-sectional view taken along the line AB of FIG. The conductive plate 18 is a belt-like ground member that conductively connects the conductive pipe 16 to the ground conductor plate 26. The conductive plate 18 extends in the vertical direction, and the upper end is joined to the side surface of the conductive pipe 16. Two conductive contact pieces 28 protrude from the lower end of the conductive plate 18 in a direction perpendicular to the plate surface of the conductive plate 18 and away from each other. The lower surface of each conductive contact piece 28 is in conductive contact with the upper surface of the ground conductor plate 26. The ground conductor plate 26 may be separated from the vehicle body and attached to the vehicle body, or may be a part of the vehicle body.

  FIG. 4 shows a perspective view of the vehicle-mounted noise suppression filter 10 when the exterior member 20 is shown by a solid line. As shown in FIGS. 2 and 4, the exterior member 20 extends along the magnetic body accommodating portion 30 that accommodates the magnetic pipe 14, the conductor accommodating portion 32 that accommodates the conductive pipe 16, and the conductive plate 18. A support 34, a clip portion 36 provided at the tip of the support 34, and a fixing plate 38 that sandwiches the ground conductor plate 26 between the clip portion 36 and the clip portion 36.

  The magnetic body accommodating portion 30, the conductor accommodating portion 32, the support column 34, the clip portion 36, and the fixing plate 38 are formed of a resin such as rubber or plastic. For example, when a thermoplastic resin is used as the material of the exterior member 20, the exterior member 20 is formed by molding the magnetic pipe 14, the conductive pipe 16, and the conductive plate 18 with a resin softened by heating. May be.

  The magnetic substance accommodating part 30 and the electric conductor accommodating part 32 form a cylindrical shape along the outer surfaces of the magnetic substance pipe 14 and the conductive pipe 16, respectively. A column 34 extends downward from the side surface of the conductor housing portion 32. The support post 34 covers the conductive plate 18. Thus, instead of the structure in which the support 34 covers the conductive plate 18, the conductive plate 18 may be fixed to the side surface of the support 34.

  The clip portion 36 is formed in a quadrangular pyramid shape and forms a wedge shape together with the support column 34. In addition to the quadrangular pyramid shape, the clip portion 36 may be formed in a general polygonal pyramid shape, a conical shape, or the like. For example, the clip portion 36 is formed at the tip of the support post 34 after the support post 34 is passed through the mounting hole 40 provided in the ground conductor plate 26. Alternatively, the clip portion 36 may be formed in a size that can penetrate the attachment hole 40 using a resilient material, and the clip portion 36 may be penetrated through the attachment hole 40. The clip portion 36 is located on the lower surface side of the ground conductor plate 26, and has a plate surface perpendicular to the extending direction of the support column 34, and the fixed conductor 38 located on the upper surface side of the ground conductor plate 26. Between. As a result, the pillar 34 is fixed to the ground conductor plate 26, and the magnetic body accommodating portion 30 and the conductor accommodating portion 32 are supported on the ground conductor plate 26 via the pillar 34. In addition, a force that is pressed against the ground conductor plate 26 acts on the conductive contact piece 28 due to the crimping force by the clip portion 36 and the fixing plate 38. This ensures that the conductive plate 18 is in conductive contact with the ground conductor plate 26.

  The magnetic pipe 14 increases the flux linkage with respect to the current flowing through the harness 12. That is, an inductor is formed in the magnetic pipe 14 and the harness 12. Further, the conductive pipe 16 increases the ground capacitance of the harness 12. That is, the conductive pipe 16 and the harness 12 are formed with a capacitor inserted between the conductor wire 22 and the ground conductor plate 26. Therefore, the equivalent circuit of the on-vehicle noise suppression filter 10 is an LC filter circuit including an inductor 42 and a capacitor 44 as shown in FIG. The inductor 42 is connected in series to the conductor wire 22, and the capacitor 44 is shunt connected between the conductor wire 22 and the ground conductor plate 26.

  The inductance value of the inductor 42 is adjusted by changing the shape, size, magnetic permeability, etc. of the magnetic material pipe 14. The capacitance of the capacitor 44 is adjusted by changing the shape and size of the conductive pipe 16 and the dielectric constant of the insulator 24 of the harness 12.

  According to such a configuration, the noise input from one end of the harness 12 is output from the other end after being suppressed by the vehicle-mounted noise suppression filter 10.

  According to the vehicle-mounted noise suppression filter 10 according to the present embodiment, the components are housed together in the exterior member 20 and are fixed on the ground conductor plate 26 of the vehicle body. Further, the conductive pipe 16 forming the capacitor is conductively connected to the ground conductor plate 26 together with the fixing of the vehicle-mounted noise suppression filter 10 by the conductive plate 18 extending along the pillar 34. Thereby, the mounting structure and grounding structure of the on-vehicle noise suppression filter 10 can be simplified.

  The vehicle-mounted noise suppression filter 10 may be configured to fix the fixing plate 38 to the ground conductor plate 26 with bolts 46 and nuts 48 as shown in FIG. In this case, the mounting hole 40 may not be provided in the ground conductor plate 26. Further, the clip portion 36 may not be provided at the tip of the column 34.

  DESCRIPTION OF SYMBOLS 10 Noise suppression filter for vehicle mounting, 12 Harness, 14 Magnetic pipe, 16 Conductive pipe, 18 Conductive plate, 20 Exterior member, 22 Conductor wire, 24 Insulator, 26 Ground conductor plate, 28 Conductive contact piece, 30 Magnetic Body housing part, 32 Conductor housing part, 34 strut, 36 clip part, 38 fixing plate, 40 mounting hole, 42 inductor, 44 capacitor, 46 bolt, 48 nut.

Claims (3)

A conductor wire connected to the on-vehicle equipment;
A magnetic member provided with a through hole and through which the conductor wire passes;
A conductive member provided with a through hole and through which the conductor wire passes;
A grounding member that conductively connects the grounding conductor plate of the vehicle body and the conductive member;
A support member having a support formed along the ground member, and supporting the conductor wire, the magnetic member, and the conductive member on the ground conductor plate;
A vehicle-mounted noise suppression filter comprising: The on-vehicle noise suppression filter according to claim 1,
The support member has an accommodating portion for accommodating the magnetic member and the conductive member,
The vehicle-mounted noise suppression filter, wherein the column covers the ground member and supports the housing portion on the ground conductor plate. In the vehicle-mounted noise suppression filter according to claim 1 or 2,
The support member is
A clip portion that is provided at a tip portion of the support column on the ground conductor plate side and has a wedge shape with the support column;
A fixing plate having a plate surface perpendicular to the extending direction of the support column and sandwiching the ground conductor plate between the clip portion;
A vehicle-mounted noise suppression filter comprising:

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