JP2016082119A - Filter case and noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To house a plurality of types of ferrite cores having different external diameter in adhesion state.SOLUTION: A filter case A for housing ferrite cores 50L, 50S, combining a pair of core structures 51L, 51S so as to interpose conducting paths 60L, 60S includes a first case structure 10, a second case structure 20 constituting a housing space 17 for housing the ferrite core 50S when combined with a first case structure 10, a plurality of first locking parts 31 formed in the first case structure 10, and formed to be arranged in the combination direction, and a second locking part 44 formed in the second case structure 20, and locks the first case structure 10 and second case structure 20 in combination state, by locking selectively to any one of the plurality of first locking parts 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a filter case and a noise filter.

  Patent Document 1 discloses a noise filter including a ferrite core that surrounds a conductive path and a cylindrical filter case that houses the ferrite core. The ferrite core is configured by combining a pair of core components, and the filter case is configured by combining a pair of case components. The case structure is formed with an elastic pressing piece that presses the core structure radially inward. With this elastic pressing piece, the pair of core components are brought into close contact with each other to ensure good filter performance.

JP 2014-110343 A

  Since the elastic pressing piece is a form in which a part of the case structure is cut and raised, there is a restriction on the amount of elastic deflection in the radial direction. Therefore, it was not possible to cope with a plurality of types of ferrite cores having different outer diameters.

  This invention is completed based on the above situations, Comprising: It aims at accommodating the multiple types of ferrite core from which an outer diameter differs in close_contact | adherence state.

The filter case of the first invention is
A filter case containing a ferrite core in a form in which a pair of core structural bodies are combined so as to sandwich a conductive path,
A first case structure;
A second case structure that forms an accommodation space for accommodating the ferrite core by being combined with the first case structure;
A plurality of first locking portions formed in the first case structure and arranged in the coalescing direction;
The first case structure and the second case are formed in the second case structure and selectively locked with any one of the plurality of first locking parts. It has a feature in that it includes a second locking portion that locks the structural body in the combined state.

The noise filter of the second invention is
It is a form in which a pair of core structural bodies are combined, and a ferrite core that is inserted so as to sandwich a conductive path between the pair of core structural bodies,
A filter case for accommodating the ferrite core, wherein the first case structure and the second case structure are combined.
A plurality of first locking portions formed in the first case structure and arranged in the coalescing direction;
The first case structure and the second case are formed in the second case structure and selectively locked with any one of the plurality of first locking parts. It has a feature in that it includes a second locking portion that locks the structural body in the combined state.

  According to 1st invention and 2nd invention, if the 1st latching part which a 2nd latching part latches among several 1st latching parts is changed, a 1st case structure and a 2nd case structure Since the positional relationship at the time of completion of uniting of the bodies changes, a pair of core components can be held in close contact with each other with respect to a plurality of types of ferrite cores having different outer diameters.

The front view of the noise filter comprised by attaching the comparatively small diameter ferrite core to the filter case of Example 1 XX sectional view of FIG. XX line equivalent sectional view of a noise filter configured by attaching a ferrite core having a larger outer diameter than FIGS. 1 and 2 to the filter case

(1) The filter case of the first invention and the noise filter of the second invention are such that at least one of the first case structure and the second case structure is an axis parallel to the conductive path. May be provided with a plurality of pressing portions that press the outer periphery of the ferrite core by being relatively displaced.
According to this configuration, a radially inward pressing force can be applied from the filter case to a plurality of circumferentially spaced locations on the outer periphery of the ferrite core regardless of the outer diameter dimension of the ferrite core.

(2) In the filter case of the first invention and the noise filter of the second invention, in (1), the pressing portion may be capable of elastic bending.
Since the plurality of first locking portions are arranged so as to be spaced apart from each other, a gap is formed between the inner peripheral surface of the case structural body and the outer peripheral surface of the ferrite core when the case structural bodies are combined. I am concerned that it will occur. However, both core constituents can be securely brought into close contact with each other by elastically bending the pressing portion and elastically contacting the outer peripheral surface of the ferrite core.

(3) In the filter case of the first invention and the noise filter of the second invention, in (1) or (2), the plurality of pressing portions may be connected via a hinge that can be elastically bent.
Since the plurality of first locking portions are arranged so as to be spaced apart from each other, a gap is formed between the inner peripheral surface of the case structural body and the outer peripheral surface of the ferrite core when the case structural bodies are combined. I am concerned that it will occur. However, since the pressing portion can be elastically brought into contact with the outer peripheral surface of the ferrite core by elastically bending the hinge, both core components can be reliably brought into close contact with each other.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS. The filter case A of the first embodiment constitutes noise filters Fa and Fb by assembling two types of ferrite cores 50L and 50S having different outer diameters. The ferrite cores 50L and 50S constituting the noise filters Fa and Fb surround the conductive paths 60L and 60S, thereby removing noise in the conductive paths 60L and 60S. In the following description, regarding the front and rear direction, the right side in FIGS. Moreover, regarding the up and down directions, the directions appearing in FIGS. 1 to 3 are defined as the upper side and the lower side as they are.

  The filter case A is molded as a single component made of synthetic resin, and has a form in which the first case structure 10 and the second case structure 20 are connected by the main hinge 18 so as to be relatively displaceable. The first case component 10 has a substantially semicircular arc shape as a whole, and the inside of the first case component 10 is a first accommodating recess 11. The second case structure 20 also has a substantially semicircular arc shape as a whole, and the inside of the second case structure 20 is a second housing recess 21. The filter case A is formed by a mold (not shown) in a form in which the first housing recess 11 and the second housing recess 21 are largely opened to the outside. When the two case components are combined using the main hinge 18 as a fulcrum, the filter case A becomes a substantially cylindrical shape, and the housing space 17 is formed by the housing recesses 11 and 21 inside the filter case A.

  The first case structural body 10 includes a first peripheral wall portion 12 and a pair of left and right first restriction wall portions 15. The first peripheral wall portion 12 includes a front first pressing portion 13F (a pressing portion recited in the claims), a central first pressing portion 13C (a pressing portion recited in the claims), and a rear first pressing portion 13R (invoicing). And a pressing portion described in the item). These pressing portions 13F, 13C, and 13R are all plate-shaped, and are relatively displaced by the first sub hinge 14 (hinge described in claims) so as to be aligned in the circumferential direction and using the first sub hinge 14 as a fulcrum. Linked to get. The first pressing portions 13F, 13C, 13R adjacent in the circumferential direction can be relatively displaced around an axis parallel to the axis of the conductive paths 60L, 60S described later while elastically deforming the first sub hinge 14. ing.

  The first restricting wall portion 15 extends from the left and right edges of the first pressing portions 13F, 13C, and 13R inward in the radial direction (so as to face the first accommodating recess 11), respectively. It is comprised by the plate-shaped control part 16. FIG. The first restricting wall 15 restricts the ferrite cores 50L and 50S (core constituent bodies 51L and 51S) accommodated in the first accommodating recess 11 from separating in the left-right direction (the axial direction of the conductive paths 60L and 60S). To do.

  The second case configuration body 20 includes a second peripheral wall portion 22 and a pair of left and right second restriction wall portions 25. The second peripheral wall portion 22 includes a front second pressing portion 23F (the pressing portion described in the claims), a central second pressing portion 23C (the pressing portion described in the claims), and a rear second pressing portion 23R (the charging). And a pressing portion described in the item). These pressing portions 23F, 23C, and 23R are all plate-shaped, and are relatively displaced by the second sub hinge 24 (hinge described in claims) so as to be aligned in the circumferential direction and using the second sub hinge 24 as a fulcrum. Linked to get. The second pressing portions 23F, 23C, and 23R adjacent in the circumferential direction can be relatively displaced around an axis parallel to the axis of the conductive paths 60L and 60S described later while elastically deforming the second sub hinge 24. ing.

  The second restriction wall portion 25 extends from the left and right end edges of each of the second pressing portions 23F, 23C, and 23R inwardly in the radial direction (so as to face the second accommodating recess 21). It is comprised by the plate-shaped control part 26. FIG. The second restriction wall portion 25 restricts the ferrite cores 50L and 50S (core structural bodies 51L and 51S) housed in the second housing recess 21 from separating in the left-right direction (the axial direction of the conductive paths 60L and 60S). To do.

  Since the rigidity of the first sub-hinge 14 and the second sub-hinge 24 is set to be higher than that of the main hinge 18, when the first case component 10 and the second case component 20 are combined, the main hinge 18. Is greatly elastically bent, but the sub hinges 14 and 24 are hardly deformed. Therefore, in the process of combining the first case component 10 and the second case component 20, both the first case component 10 and the second case component 20 maintain a substantially semicircular arc shape.

  The filter case A is formed with a pair of left and right first lock portions 30 and a pair of left and right second lock portions 40 as means for locking the first case structure 10 and the second case structure 20 in a combined state. Has been. In the following description, the “merging direction” refers to the direction in which the first lock portion 30 and the second lock portion 40 are relatively displaced at the end of the process in which the case structural bodies 10 and 20 are merged (the vertical direction in FIG. 2). ).

  The first lock part 30 is formed integrally with the first case structure 10. The 1st lock part 30 is the form extended in the cantilever direction from the front edge of the front 1st press part 13F to the uniting direction (circumferential direction). A plurality of first locking portions 31 having a groove shape are formed on the outer surface of the first lock portion 30 at a constant pitch along the uniting direction. Each of the first locking portions 31 includes a first locking surface 32 that is substantially perpendicular to the uniting direction (the direction in which the first locking units 31 are arranged), and a first guide surface that is inclined with respect to the uniting direction. 33.

  The second lock portion 40 includes a pair of left and right side wall portions 41 protruding from the outer surface of the front side second pressing portion 23F, a receiving portion 42 configured to connect protruding end edges of both side wall portions 41, and both side wall portions 41 The protection part 43 of the form which connects protrusion end edges is comprised. On the inner surface (the surface facing the front second pressing portion 23F) of the receiving portion 42, two second locking portions 44 having a protruding shape are formed side by side in the uniting direction. Each of the second locking portions 44 has a second locking surface 45 that is substantially perpendicular to the coalescing direction and a second guide surface 46 that is inclined with respect to the coalescing direction. The pitch of the two second locking portions 44 is the same as the pitch of the plurality of first locking portions 31. The protection part 43 is arranged at a position opposite to the first case component 10 with the second locking part 44 in between in the uniting direction.

  As shown in FIG. 2, the ferrite core 50 </ b> S having a small outer diameter is formed in an annular shape by combining a pair of core components 51 </ b> S having a semicircular arc shape. The pair of core structural bodies 51S are parts having the same shape and the same dimensions. In a state in which both core constituent bodies 51S are combined, a circular cross-sectional insertion hole 52S penetrating in the left-right direction is formed in the ferrite core 50S. A conductive path 60S having a large outer diameter is passed through the insertion hole 52S. The conductive path 60S is a wire harness or the like in which one electric wire, a plurality of electric wires are bundled, and has a circular cross section. By surrounding the conductive path 60S with the pair of core structural bodies 51S, the noise of the conductive path 60S is removed.

  As shown in FIG. 3, the ferrite core 50 </ b> L having a large outer diameter is formed in an annular shape by combining a pair of core constituting bodies 51 </ b> L having a semicircular arc shape. The pair of core structural bodies 51L are parts having the same shape and the same dimensions. In a state in which both core components 51L are combined, a circular cross-sectional insertion hole 52L that penetrates in the left-right direction is formed in the ferrite core 50L. A conductive path 60L having a large outer diameter is passed through the insertion hole 52L. The conductive path 60L is a wire harness or the like in which one electric wire, a plurality of electric wires are bundled, and has a circular cross section. By surrounding the conductive path 60L with the pair of core components 51L, the noise of the conductive path 60L is removed.

  The ferrite cores 50L and 50S are accommodated in the accommodating space 17 of the filter case A. The dimensions of the ferrite cores 50L, 50S in the axial direction (left-right direction) are substantially the same as the distance between the pair of regulating wall portions 15, 25. Therefore, there is no possibility that the ferrite cores 50L and 50S accommodated in the accommodation space 17 are detached in the left-right direction. Further, in a state in which the filter case A is combined, the projecting end edges of the plurality of first plate-like restriction portions 16 constituting the first restriction wall portion 15 and the plurality of second plate shapes constituting the second restriction wall portion 25. The protruding end edge of the restricting portion 26 is arranged along a circle that is substantially concentric with the insertion holes 52L and 52S. Since the protruding end edges of these plate-like restricting portions 16 and 26 are located radially outward from the outer periphery of the conductive paths 60L and 60S, the restricting wall portions 15 and 25 interfere with the conductive paths 60L and 60S. There is no fear.

  Next, the operation of assembling the noise filter Fa and attaching it to the conductive path 60S will be described. First, the 1st case structure 10 and the 2nd case structure 20 are opened, and it is set as the direction which the accommodation recessed parts 11 and 21 open upwards. In this state, the core structure 51S is accommodated in each of the accommodating recesses 11 and 21, respectively. At this time, locking means may be formed on the inner peripheral surfaces of the case structural bodies 10 and 20 and the outer peripheral surface of the core structural body 51S to prevent them from being detached. Then, the narrower conductive path 60S is set in the core structure 51S of the second case structure 20.

  When the core structure 51S and the conductive path 60S are set in the filter case A, the first case structure 10 and the second case structure 20 are combined while the main hinge 18 is deformed. At this time, the second case structure 20 in which the conductive path 60S is set does not change the direction, and the first case structure 10 is reversed. In the final stage of the coalescence process, the extended end portion of the first lock portion 30 is inserted between the outer peripheral surface of the front second pressing portion 23F and the receiving portion 42 of the second lock portion 40. In the process of inserting the first lock portion 30, the ratchet groove-shaped first locking portion 31 and the claw-shaped second locking portion 44 interfere with each other such that the guide surfaces 33 and 46 are in sliding contact with each other.

  When both case components 10 and 20 are brought close to each other until both core components 51S come into close contact with each other, the combination of both case components 10 and 20 is completed to form the filter case A, and both core components 51S. As a result, the ferrite core 50S is formed, and the assembly work of the noise filter Fa is completed. At the same time as the assembly of the noise filter Fa is completed, the work of attaching the noise filter Fa to the conductive path 60S is also completed.

  In a state where the assembly of the noise filter Fa is completed, any one of the plurality of first locking portions 31 arranged in the uniting direction is locked with the second locking portion 44. That is, the projecting second locking portion 44 is fitted into the groove-shaped first locking portion 31, and the first locking surface 32 and the second locking surface 45 abut on the uniting direction. By this abutment action, both case components 10 and 20 are locked in a state in which relative displacement in the separating direction is restricted. As a result, the ferrite core 50S is held in a state in which both core components 51S are in close contact.

  Further, the assembly of the noise filter Fb using the ferrite core 50L having a large outer diameter and the attachment of the thicker conductive path 60L can be performed in the same manner as described above. In the filter case A of the first embodiment, not only the two types of ferrite cores 50L and 50S having different outer diameters but also other ferrite cores having outer diameters different from the ferrite cores 50L and 50S can be attached. The noise filter Fa shown in FIGS. 1 and 2 is obtained by attaching a ferrite core 50S having a relatively small outer diameter to the filter case A, and the noise filter Fb shown in FIG. 3 has a relatively large outer diameter (see FIG. A ferrite core 50L (which is larger than the ferrite core 50S shown in FIGS. 1 and 2) is attached to the filter case A.

  2 and 3, in the noise filter Fa in which the ferrite core 50S having a relatively small diameter is accommodated in the filter case A, the first lock portion 30 is deeply extended to the base end portion (upper end portion in FIGS. 1 and 2). The first locking portion 31 on the base end side (upper side) of the plurality of first locking portions 31 is locked with the second locking portion 44. Moreover, the front-end | tip part (lower end part in FIG. 1, 2) of the 1st lock part 30 is accommodated between the outer periphery of the front side 2nd press part 23F, and the protection part 43, and is protected from interference of a foreign material. And the distance of the up-down direction (merging direction) of both case structure 10 and 20 is also small.

  On the other hand, in the noise filter Fb in which the relatively large-diameter ferrite core 50L is accommodated in the filter case A, the fitting depth of the first lock portion 30 with respect to the second lock portion 40 is shallow, and the first lock portion 30 has its tip portion. And the second lock portion 40 is fitted. That is, the first locking portion 31 on the distal end side (lower side) of the plurality of first locking portions 31 is locked with the second locking portion 44. And the distance of the up-down direction (merging direction) of both case structure 10 and 20 is large.

  In the process of locking the first locking portion 31 and the second locking portion 44 until the filter case A is locked in the combined state, the sub hinges 14 and 24 and the pressing portions 13F, 13C, 13R, 23F, 23C, 23R is elastically bent slightly. Then, due to the elastic restoring force of the sub hinges 14 and 24 and the pressing portions 13F, 13C, 13R, 23F, 23C, and 23R, the inner peripheral surface of the first peripheral wall portion 12 and the inner peripheral surface of the second peripheral wall portion 22 become the ferrite core 50L. , 50S is pressed radially inward. As a result, the core structural bodies 51L and the core structural bodies 51S are securely adhered to each other, and the filter performance of the ferrite cores 50L and 50S is improved.

  The filter case A of the first embodiment is a form in which a pair of core structural bodies 51L or a pair of core structural bodies 51S are combined, and two types of ferrite cores 50L and 50S having different outer diameters are selectively in close contact with each other. It is for housing. The filter case A includes a first case structure 10 and a second case structure 20 that is combined with the first case structure 10 to form the accommodation space 17 for accommodating the ferrite cores 50L and 50S. Yes. The first case structure 10 is formed with a plurality of first locking portions 31 formed so as to be aligned in the coalescing direction, and the second case structure 20 has any one of the plurality of first locking portions 31. By selectively locking with the first locking portion 31, a second locking portion 44 that locks both case components 10 and 20 in the combined state is formed.

  According to this structure, when the 1st latching | locking part 31 which the 2nd latching | locking part 44 latches among the some 1st latching | locking parts 31 is changed, the 1st case structure 10 and the 2nd case structure 20 of FIG. Since the positional relationship at the time of completion of the combination is changed, a pair of core constituent bodies 51L or a pair of core constituent bodies 51S are used as the two case constituent bodies 10 and 20 for two types of ferrite cores 50L and 50S having different outer diameters. Can be sandwiched and adhered.

  Further, the first case structure 10 and the second case structure 20 include a plurality of pressing portions 13F, 13C, 13R, 23F, 23C, and 23R that can be relatively displaced with an axis parallel to the conductive paths 60L and 60S as a fulcrum. Configured. According to this configuration, regardless of the outer diameter dimensions of the ferrite cores 50L and 50S, the radially inward push from the filter case A is applied to a plurality of circumferentially spaced locations on the outer periphery of the ferrite cores 50L and 50S. Pressure can be applied.

  Further, since the first locking surfaces 32 of the plurality of first locking portions 31 are arranged so as to be spaced apart from each other, when the case structural bodies 10 and 20 are combined, the case structural bodies 10 and 20 are combined. There is a concern that a gap may be formed between the inner peripheral surface of the ferrite core and the outer peripheral surfaces of the ferrite cores 50L and 50S. However, since the pressing portions 13F, 13C, 13R, 23F, 23C, and 23R can be elastically bent, the pressing portions 13F, 13C, 13R, 23F, 23C, and 23R are elastically bent to thereby press the pressing portion 13F. , 13C, 13R, 23F, 23C, 23R can be elastically brought into contact with the outer peripheral surfaces of the ferrite cores 50L, 50S. In addition, since the plurality of pressing portions 13F, 13C, 13R, 23F, 23C, and 23R are connected via the sub-hinges 14 and 24 that can be elastically bent, the pressing portions 13F can also be formed by elastically bending the sub-hinges 14 and 24. , 13C, 13R, 23F, 23C, 23R can be elastically brought into contact with the outer peripheral surfaces of the ferrite cores 50L, 50S. Therefore, both the core constituent bodies 51L and the core constituent bodies 51S can be reliably brought into close contact with each other.

<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 Example 1 described above, there is one insertion hole formed in the ferrite core, but the present invention can also be applied to a case where a plurality of insertion holes are formed in one ferrite core.
(2) In the first embodiment, the filter case is a single part in which the first case structure and the second case structure are connected by a hinge. However, the first case structure and the second case structure are separate. It may be a part.
(3) In the first embodiment, the first locking portion and the second locking portion are formed only on the front side of the first case structural body and the second case structural body. The stop portion may be formed only on the rear side of the first case structure and the second case structure, or may be formed on both front and rear sides of the first case structure and the second case structure.
(4) In the first embodiment, both the first case structure and the second case structure are composed of a plurality of pressing portions that can be relatively displaced about an axis parallel to the conductive path. One or both of the structural body and the second case structural body may be a highly rigid arc-shaped member that is not easily deformed.
(5) In the first embodiment, the pressing portion has a flat plate shape, but the pressing portion may have a curved plate shape, a bent plate shape, an arm shape, or the like. Moreover, the area | region which contact | abuts to the outer peripheral surface of a ferrite core among press parts is not restricted to plate shape, A protrusion shape may be sufficient.
(6) In the first embodiment, the first locking portion is formed on the outer surface of the first lock portion, and the second locking portion is formed on the inner surface of the second lock portion. It may be formed on the inner surface of the lock portion, and the second locking portion may be formed on the outer surface of the second lock portion.
(7) In the first embodiment, the pressing portion can be elastically bent. However, the pressing portion may not be elastically bent.
(8) In the first embodiment, the plurality of pressing portions are connected via hinges that can be elastically bent. However, each pressing portion may be a separate component, and the pressing portions may be connected with pins or the like.
(9) In the first embodiment, the two second locking portions are formed side by side in the uniting direction, but the number of the second locking portions may be one or three or more.

A ... Filter case Fa, Fb ... Noise filter 10 ... First case structure 13C ... Central first pressing part (pressing part)
13F ... Front side first pressing part (pressing part)
13R: Rear first pressing portion (pressing portion)
14, 24 ... Sub hinge (hinge)
17 ... Accommodating space 20 ... Second case structure 23C ... Central second pressing part (pressing part)
23F ... Front side second pressing part (pressing part)
23R: Rear second pressing portion (pressing portion)
31 ... 1st latching | locking part 44 ... 2nd latching | locking part 50L, 50S ... Ferrite core 51L, 51S ... Core structure 60L, 60S ... Conductive path

Claims (5)

A filter case containing a ferrite core in a form in which a pair of core structural bodies are combined so as to sandwich a conductive path,
A first case structure;
A second case structure that forms an accommodation space for accommodating the ferrite core by being combined with the first case structure;
A plurality of first locking portions formed in the first case structure and arranged in the coalescing direction;
The first case structure and the second case are formed in the second case structure and selectively locked with any one of the plurality of first locking parts. A filter case, comprising: a second locking portion that locks the structural body in a combined state.   A plurality of pressings for pressing the outer periphery of the ferrite core by relative displacement of at least one of the first case structure and the second case structure with an axis parallel to the conductive path as a fulcrum. The filter case according to claim 1, comprising a portion.   The filter case according to claim 2, wherein the pressing portion can be elastically bent.   The filter case according to claim 2 or 3, wherein the plurality of pressing portions are connected via hinges that can be elastically bent. It is a form in which a pair of core structural bodies are combined, and a ferrite core that is inserted so as to sandwich a conductive path between the pair of core structural bodies,
A filter case for accommodating the ferrite core, wherein the first case structure and the second case structure are combined.
A plurality of first locking portions formed in the first case structure and arranged in the coalescing direction;
The first case structure and the second case are formed in the second case structure and selectively locked with any one of the plurality of first locking parts. A noise filter, comprising: a second locking portion that locks the structural body in a combined state.

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