Noise filter and noise reduction unit

Patent metadata

Field	Value
Publication number	US-10707628-B2
Application number	US-201815947093-A
Country	US
Kind code	B2
Filing date	Apr 6, 2018
Priority date	Apr 17, 2017
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A noise filter including a conductor and an annular core. The conductor has a wound portion. The annular core is formed of a magnetic material and passes through the wound portion. The annular core is formed of a pair of split cores that are assembled together with joining surfaces on both ends to be joined to each other. At least one of a recess portion and a projection portion that engage with each other is formed on the joining surfaces of the split cores which are joined to each other.

First claim

What is claimed is:

1. A noise filter comprising:
at least one conductor including a wound portion; and
an annular core formed of a magnetic material,
wherein the annular core includes a first split core and a second split core,
wherein only one of the first split core and the second split core passes through the at least one conductor including the wound portion, and wherein the other of the first split core and the second split core does not pass through any wound portion of any conductor,
wherein the first split core includes a first joining surface at one end, in a first direction, a second joining surface at the other end, in the first direction, and a first body portion disposed between the first joining surface and the second joining surface in the first direction,
wherein the second split core includes a third joining surface at the one end, in the first direction, a fourth joining surface at the other end, in the first direction, and a second body portion disposed between the third joining surface and the fourth joining surface in the first direction,
wherein the first body portion and the second body portion form a space therebetween in a second direction perpendicular to the first direction, the wound portion being wound around at least one of the first body portion and the second body portion,
wherein the first split core and the second split core are assembled together by joining the first joining surface and the third joining surface to each other and joining the second joining surface and the fourth joining surface to each other, the first joining surface facing the third joining surface in the second direction when assembled,
wherein the first joining surface includes one of a plurality of recess portions and a plurality of projection portions and the third joining surface includes the other of the plurality of recess portions and the plurality of projection portions, and the one of the plurality of recess portions and the plurality of projection portions of the first joining surface and the other of the plurality of recess portions and the plurality of projection portions of the third joining surface engage with each other with the projection portions being configured for insertion into the recess portions in the second direction, and
wherein the second joining surface includes one of a plurality of recess portions and a plurality of projection portions and the fourth joining surface includes the other of the plurality of recess portions and the plurality of projection portions, and the one of the plurality of recess portions and the plurality of projection portions of the second joining surface and the other of the plurality of recess portions and the plurality of projection portions of the fourth joining surface engage with each other with the projection portions being configured for insertion into the recess portions in the second direction.

2. The noise filter according to claim 1 , wherein the one of the recess portion and the projection portion of the first joining surface includes one of a hole and a protrusion, respectively, and
wherein the other of the recess portion and the projection portion of the third joining surface includes the other of the hole and the protrusion, respectively, that engages with the one of the hole and the protrusion.

3. The noise filter according to claim 1 ,
wherein the recess portion has a tapered shape that becomes gradually narrower toward a bottom portion, and the projection portion has a tapered shape that becomes gradually narrower in a protruding direction.

4. The noise filter according to claim 1 , wherein the first joining surface and the third joining surface are adhered and fixed to each other by a magnetic adhesive member.

5. The noise filter according to claim 1 , wherein the first joining surface includes the projection portion and the third joining surface includes the recess portion, and
wherein the projection portion of the first joining surface extends, in a direction away from the first joining surface, beyond an uppermost surface of the third joining surface forming a boundary of the recess portion of the third joining surface.

6. A noise reduction unit comprising a housing in which the noise filter according to claim 1 is accommodated, wherein an electric wire of a wire harness routed into the housing is electrically connected to the at least one conductor.

7. The noise reduction unit of claim 6 , wherein a terminal of the at least one conductor is secured to the housing in the second direction.

8. A noise filter comprising:
a plurality of conductors, each of the conductors including a wound portion; and
an annular core formed of a magnetic material,
wherein the annular core passes through the wound portion in a first direction,
wherein the annular core includes a first split core and a second split core,
wherein the first split core includes a first joining surface at one end, in the first direction, and a second joining surface at the other end, in the first direction,
wherein the second split core includes a third joining surface at the one end, in the first direction, and a fourth joining surface at the other end, in the first direction,
wherein the first split core and the second split core are assembled together by joining the first joining surface and the third joining surface to each other and joining the second joining surface and the fourth joining surface to each other,
wherein the first joining surface includes one of a plurality of recess portions and a plurality of projection portions and the third joining surface includes the other of the plurality of recess portions and the plurality of projection portions, and the one of the plurality of recess portions and the plurality of projection portions of the first joining surface and the other of the plurality of recess portions and the plurality of projection portions of the third joining surface engage with each other with the projection portions being configured for insertion into the recess portions,
wherein the second joining surface includes one of a plurality of recess portions and a plurality of projection portions and the fourth joining surface includes the other of the plurality of recess portions and the plurality of projection portions, and the one of the plurality of recess portions and the plurality of projection portions of the second joining surface and the other of the plurality of recess portions and the plurality of projection portions of the fourth joining surface engage with each other with the projection portions being configured for insertion into the recess portions, and
wherein at least one of the first split core and the second split core has a linear shape,
wherein the plurality of conductors are aligned and spaced apart in the first direction, while only one of the at least one of the first split core and the second split core having the linear shape passes through the wound portions of the plurality of conductors, and
wherein the other of the first split core and second split core does not pass through any wound portion of any conductor.

9. A noise filter comprising:
at least one conductor including a wound portion; and
an annular core formed of a magnetic material,
wherein the annular core includes a first split core and a second split core,
wherein only one of the first split core and the second split core passes through the at least one conductor including the wound portion, and wherein the other of the first split core and the second split core does not pass through any wound portion of any conductor,
wherein the first split core includes a first joining surface at one end, in the first direction, a second joining surface at the other end, in t

Assignees

• Yazaki Corp

Inventors

• Iizuka Hayato
• Kayo Kazuma

Classifications

• H01F27/027 Primary

  specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards · CPC title

• H01F2017/065

  Core mounted around conductor to absorb noise, e.g. EMI filter · CPC title

• H01F27/022

  Encapsulation · CPC title

• H01F17/041

  Means for preventing rotation or displacement of the core · CPC title

• H01F17/062

  Toroidal core with turns of coil around it · CPC title