JP2015167154A - noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform connection of a capacitor without depending on welding.SOLUTION: A noise filter 10 includes: a core made of a ring-shaped magnetic material enclosing an electric wire; an inductor 14 which is made of a metal wire and arranged so as to be submerged in the core; a capacitor 25 having a form in which a lead wire 27 is led out from a capacitor body 26; and an elastic contact piece 23 which is provided at least at one end out of the end of the inductor 14 and the end of the lead wire 27 and capable of coming in elastic contact with the other end.

Description

  The present invention relates to a noise filter.

  Patent Document 1 discloses a noise filter including a ring-shaped magnetic core surrounding a main wiring and a resonance circuit. The resonance circuit includes a resonance wiring hidden in the magnetic core and capacitors connected to both ends of the resonance wiring.

JP 2012-0195504 A

  As a general capacitor, a capacitor in which a pair of lead wires are led out from a capacitor body is known. As a means for connecting the capacitor and the resonance wiring, a method of fixing the resonance wiring and the lead wire by welding is general. However, when connecting by welding, there is a concern that heat during welding adversely affects the capacitor.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to enable connection of capacitors without depending on welding.

The noise filter of the present invention is
A core made of a ring-shaped magnetic material surrounding the electric wire;
An inductor made of a metal wire and arranged to be hidden in the core;
A capacitor in a form in which a lead wire is led out from the capacitor body;
It is characterized in that an elastic contact piece provided at at least one of the end of the inductor and the end of the lead wire and elastically contactable with the other end is provided.

  If the elastic contact piece provided at at least one of the end portion of the inductor and the end portion of the lead wire is brought into elastic contact with the other end portion, the inductor and the lead wire are connected. According to this invention, the capacitor can be connected without welding.

Partially cutaway front view showing a state in which the noise filter of Example 1 is attached to a wire harness Top view showing the noise filter attached to the wire harness and the cover removed from the positioning part Right side view showing the noise filter attached to the wire harness Partial expanded sectional view in the XX line of FIG.

  (1) The noise filter of the present invention may include a positioning portion that can position the inductor and the capacitor in a connected state. According to this configuration, since the inductor and the capacitor are positioned in the connected state by the positioning unit, it is possible to prevent the connected inductor and the lead wire from being detached.

  (2) In the noise filter according to (1), the noise filter may include a holding member that holds the core, and the positioning portion may be provided on the holding member. According to this configuration, the connected inductor and capacitor can be positioned with respect to the core.

<Example 1>
Embodiment 1 of the present invention will be described below with reference to FIGS. In the following description, the directions shown in FIGS. 1 and 3 are defined as upper and lower as they are in the vertical direction. For the left and right directions, the directions shown in FIGS. 1 and 2 are defined as right and left as they are.

  The noise filter 10 of the first embodiment removes noise by being attached to a wire harness 50 configured by bundling three electric wires 51 side by side in parallel. The noise filter 10 includes a core 11, an inductor 14 that constitutes the filter circuit 13, a capacitor 25 that also constitutes the filter circuit 13, and a holding member 30 that holds the core 11 and the capacitor 25.

  The core 11 is made of a magnetic material such as iron and has an oval shape surrounding the three electric wires 51 as shown in FIG. The core 11 is configured by combining a pair of vertically symmetric half-divided magnetic bodies 12 divided along the major axis direction of an ellipse. The core 11 surrounds the three electric wires 51, thereby exhibiting a function as a filter for removing noise of the electric wires 51.

  The filter circuit 13 is configured by connecting one inductor 14 made of a conductive (metal) wire, one capacitor 25, and a pair of front and rear connection terminals 20 in a loop shape. The filter circuit 13 is attached to the core 11 so as to be hidden at the right end thereof. The inductor 14 is disposed so as to correspond to the inner peripheral surface of the core 11 and both front and rear surfaces, and the capacitor 25 is disposed on the outer peripheral surface side of the core 11. The filter circuit 13 attached to the core 11 exhibits a function as a filter that removes noise of the electric wire 51.

  The inductor 14 is formed by bending a wire. That is, the inductor 14 includes a long and thin linear base portion 15 extending in the front-rear direction and a pair of front and rear linear side portions 16 extending in the right direction from both front and rear ends of the linear base portion 15. . The cross-sectional shape of the inductor 14 is a true circle. As shown in FIG. 4, the distal end portion (right end portion) of the left and right linear side portions 16 of the inductor 14 is a small diameter fitting portion 17 having a small diameter concentrically. The base end portion (left end portion) of the connection terminal 20 is fixed to the fitting portion. A large-diameter fitting portion 18 having a large diameter concentrically is formed in a region of the linear side portion 16 on the left side (the linear base portion 15 side) of the fitting portion.

  The connection terminal 20 is formed by bending a metal plate material punched into a predetermined shape. As shown in FIG. 4, the proximal end side region (left end side region) of the connection terminal 20 is formed with a fixing portion 21 having a circular cross section in which the axis line is arranged concentrically with the linear side portion 16. The fixing portion 21 is externally fitted to the small-diameter fitting portion 17 of the inductor 14 and coupled so as not to be easily detached by means such as staking or welding. Accordingly, the pair of front and rear connection terminals 20 are fixed to the front end portions (front end portions) of the pair of front and rear linear side portions 16 of the inductor 14 so as to be conductive. In the distal end side region (right end side region) of the connection terminal 20, a rectangular tube-shaped connection portion 22 is formed in which the axis is arranged concentrically with the linear side portion 16 and the tubular portion. A pair of upper and lower elastic contact pieces 23 bent into a valley shape and a mountain shape are accommodated in the connection portion 22 so as to face each other.

  The capacitor 25 as a whole is configured to include a cylindrical capacitor body 26 whose axis is directed in the front-rear direction, and a pair of front and rear lead wires 27 led out from both front and rear end faces of the capacitor body 26. The lead wire 27 is bent in a substantially L shape in plan view, and extends to the left from the proximal end lead portion 28 extending forward or rearward from the capacitor body 26 and the extending end of the proximal end lead portion 28. The connecting lead portion 29 extends in a cantilever manner.

  The connecting lead portion 29 is arranged concentrically with the linear side portion 16 and is inserted into the connecting portion 22 from the right side. The connecting lead portion 29 inserted into the connecting portion 22 is elastically sandwiched between a pair of upper and lower elastic contact pieces 23. Due to the elasticity of the pair of upper and lower elastic contact pieces 23, the connection terminal 20 and the lead wire 27 are connected so as to be conductive. Thereby, the inductor 14 and the capacitor | condenser 25 are connected so that conduction | electrical_connection is possible via the connection terminal 20, and the loop-shaped filter circuit 13 connected over the perimeter is comprised.

  The holding member 30 is made of a synthetic resin material (insulating material) and includes a core housing portion 31 and a positioning portion 40. The core housing portion 31 is configured by combining a pair of upper and lower half members 32 and 33. The core housing portion 31 has an oval shape that matches the shape of the core 11. Each of the upper and lower halved members 32 and 33 is formed with a core accommodating space 34 for individually accommodating the halved magnetic body 12. The core housing space 34 is opened to the inner peripheral surface of the core housing portion 31 (the surface facing the wire harness 50).

  The upper half member 32 is formed with a combination locking piece 35 that protrudes outward in the left-right direction from the left and right ends of the outer peripheral surface thereof. The downward projecting end portion of the uniting locking piece 35 can be elastically bent in the left-right direction. The lower half member 33 is formed with a pair of plate-like support portions 36 that project horizontally outward from the left and right ends of the outer peripheral surface thereof. The union support portion 36 is formed with a union locking hole 37 in a form penetrating in the vertical direction. When the upper half member 32 and the lower half member 33 are vertically combined, the combined locking piece 35 is locked in the combined locking hole 37, so that the upper and lower half members 32, 33 are combined. The core accommodating part 31 is configured by being locked in the state.

  The upper half member 32 is integrally formed with a positioning portion 40 that protrudes rightward from the right end portion on the outer surface thereof. The positioning portion 40 includes a substrate portion 41 and a peripheral wall portion 42 that rises from the upper surface of the substrate portion 41 along the outer peripheral edge thereof. The peripheral wall portion 42 is arranged along the front and rear side edges and the right edge of the substrate portion 41. A plurality of lock projections 43 are formed on the outer surface of the peripheral wall portion 42 so as to be appropriately dispersed in the horizontal direction.

  As shown in FIG. 4, a pair of front and rear inductor positioning recesses 44 each having an arc shape with the axis line substantially in the left-right direction is formed in the region inside the peripheral wall portion 42 on the upper surface of the substrate portion 41. . The inductor positioning recess 44 is located near both the front and rear edges of the board portion 41 and at a position near the left end of the board portion 41. The inductor positioning recess 44 is fitted so that the lower end side region of the large-diameter fitting portion 18 is placed thereon. By this fitting action, the inductor 14 is positioned in a state where relative displacement in the front-rear direction and the left-right direction is restricted with respect to the positioning portion 40 (upper half member 32). In the state where the large-diameter fitting portion 18 is placed in the inductor positioning recess 44, the connection terminal 20 is placed on the upper surface of the substrate portion 41.

  Further, a capacitor positioning recess 45 is formed in a region inside the upper surface of the substrate portion 41 with respect to the peripheral wall portion 42. The capacitor positioning recess 45 is disposed near the right edge portion of the substrate portion 41. The capacitor positioning recess 45 has an arcuate shape with the axis line in the front-rear direction. The capacitor positioning recess 45 is fitted so that the lower end side region of the capacitor body 26 of the capacitor 25 is placed. By this fitting action, the capacitor 25 is positioned in a state where relative displacement in the front-rear direction and the left-right direction is restricted with respect to the positioning portion 40 (upper half member 32).

  A cover 46 is assembled to the positioning unit 40. The cover 46 includes a top plate portion 47 that covers substantially the entire positioning portion 40, and a side wall portion 48 that extends downward from both the front and rear edge portions and the right edge portion of the top plate portion 47. Lock holes 49 are formed at a plurality of locations corresponding to the lock protrusions 43 in the side wall 48. In the state in which the cover 46 is assembled to the positioning portion 40, the lock projection 43 and the lock hole 49 are locked to be locked in the assembled state, and the top plate portion 47 has a large diameter with the substrate portion 41. The fitting portion 18, the connection terminal 20, and the capacitor body 26 are sandwiched up and down. As a result, the inductor 14, the connection terminal 20, and the capacitor 25 are positioned in a state where relative displacement in the vertical direction is restricted with respect to the positioning portion 40.

  Next, the assembly process of the noise filter 10 will be described. When assembling, first, the half magnetic body 12 is accommodated in the core accommodating space 34 of the pair of half members 32 and 33 in the separated state in the core accommodating portion 31. On the other hand, in the filter circuit 13, the pair of connection terminals 20 are fixed to the inductor 14, and the capacitor 25 is removed from the inductor 14 (connection terminal 20). Then, the inductor 14 is made to approach the upper half member 32 from below, and the linear base portion 15 is made to approach the right end portion of the upper half member 32 and the inner circumference of the half magnetic body 12. In addition, the pair of linear side portions 16 are disposed so as to face both the front and rear outer surfaces of the upper half member 32, and the pair of front and rear connection terminals 20 are disposed above the positioning portion 40.

  With the inductor 14 and the connection terminal 20 temporarily assembled to the upper half member 32 and the positioning portion 40 in this way, the connection lead portions 29 of the pair of lead wires 27 of the capacitor 25 are connected to the pair of connection terminals 20. Insert it from the right. Then, each connection lead portion 29 is elastically sandwiched between the pair of upper and lower elastic contact pieces 23, and the inductor 14 and the capacitor 25 are connected via the connection terminal 20. At the same time, a loop-like filter circuit 13 is configured. Thereafter, the large-diameter fitting portion 18 is fitted into the inductor positioning recess 44, the capacitor body 26 is fitted into the capacitor positioning recess 45, and the filter circuit 13 is placed on the positioning portion 40. To do. Thereafter, the cover 46 is assembled to the positioning portion 40.

  Also, before and after the assembly process of the cover 46, the upper and lower halved members 32 and 33 are united so as to sandwich the wire harness 50, and both of them are engaged by the engagement of the combination locking piece 35 and the combination locking hole 37. The half members 32 and 33 are locked in the combined state. Thereby, a pair of half magnetic bodies 12 are united in the shape of an oval ring in the state which encloses the wire harness 50 (three electric wires 51) collectively, and the core 11 is comprised. Thus, the assembly of the noise filter 10 and the attachment to the wire harness 50 are completed.

  When the noise filter 10 is attached to the wire harness 50, the capacitor 25 is positioned on the outer peripheral side of the core 11. Therefore, when the noise filter 10 receives vibration, the capacitor 25 collides with the outer periphery of the core 11. There is concern about damage. However, since the capacitor 25 is accommodated in the positioning space formed by the synthetic resin positioning portion 40 and the cover 46, there is no possibility of directly colliding with the core 11. Moreover, the capacitor | condenser 25 is protected from the interference of the foreign material from the outside by being accommodated in positioning space. Therefore, there is no possibility that the capacitor 25 is damaged.

  As described above, the noise filter 10 according to the first embodiment includes the core 11 made of a ring-shaped magnetic material surrounding the electric wire 51, the inductor 14 made of a metal wire, and arranged so as to be hidden in the core 11, and the capacitor. Capacitor 25 in a form in which lead wire 27 is led out from main body 26, and provided at at least one end portion (linear side portion 16) among the end portion of inductor 14 and the end portion of lead wire 27, and the other end portion An elastic contact piece 23 capable of elastic contact with the (connecting lead portion 29) is provided. According to this configuration, if the elastic contact piece 23 provided at the end of the inductor 14 is brought into elastic contact with the end of the lead wire 27, the inductor 14 and the lead wire 27 are connected. Therefore, according to the first embodiment, the capacitor 25 and the inductor 14 can be connected without welding.

  Moreover, the noise filter 10 of the first embodiment includes a positioning unit 40 that can position the inductor 14 and the capacitor 25 in a connected state. According to this configuration, since the inductor 14 and the capacitor 25 are positioned in the connected state by the positioning unit 40, it is possible to prevent the connected inductor 14 and the lead wire 27 from being detached. Further, the noise filter 10 includes a holding member 30 that holds the core 11, and a positioning portion 40 is provided on the holding member 30. According to this configuration, the connected inductor 14 and capacitor 25 can be positioned with respect to the core 11.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the elastic contact piece is provided only on the inductor side. However, the elastic contact piece may be provided only on the lead wire side or on both the inductor and the lead wire.
(2) In the above-described embodiment, the positioning portion is not displaced relative to the holding member. However, the positioning portion can be displaced relative to the holding member, and the relative displacement can be achieved by a separate locking means or the like. You may make it regulate.
(3) In the first embodiment, the core is formed by combining a pair of half-split magnetic bodies, but the core may be a single component connected over the entire circumference. In this case, the holding member may be a single component or may be composed of a pair of half members.
(4) In the first embodiment, the pair of half members are separate parts, but the pair of half members may be a single part connected by a hinge.
(5) In the first embodiment, the inductor may be coiled around the core a plurality of times.
(6) In the said Example 1, although the three electric wires which comprise a wire harness are arrange | positioned in parallel, the three electric wires may be bundled up in a pile shape.
(7) In Example 1 described above, the wire harness is composed of three electric wires, but the number of electric wires constituting the wire harness may be two or less, or four or more.

DESCRIPTION OF SYMBOLS 10 ... Noise filter 11 ... Core 14 ... Inductor 23 ... Elastic contact piece 25 ... Capacitor 26 ... Capacitor main body 27 ... Lead wire 30 ... Holding member 40 ... Positioning part 51 ... Electric wire

Claims (3)

A core made of a ring-shaped magnetic material surrounding the electric wire;
An inductor made of a metal wire and arranged to be hidden in the core;
A capacitor in a form in which a lead wire is led out from the capacitor body;
A noise filter comprising: an elastic contact piece provided at at least one of the end of the inductor and the end of the lead wire and capable of elastically contacting the other end .   The noise filter according to claim 1, further comprising a positioning portion capable of positioning the inductor and the capacitor in a connected state. A holding member for holding the core;
The noise filter according to claim 2, wherein the positioning portion is provided on the holding member.

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