Noise filter

Abstract

The invention provides a noise filter which can electrically connect a shield layer of a shield cable with a grounding part and can stably maintain the electrical connection state. The noise filter includes a magnetic core, a ground member, and a housing. The housing has a first housing part and a second housing part. The ground member is in contact with the ground portion through the second contact portion. The second housing part is provided with a pressing part, and the pressing part is in contact with the shield cable when the second housing part is assembled on the first housing part and presses the shield cable towards the grounding part. When the shield cable is pressed by the pressing portion, the shield cable presses the grounding member toward the grounding portion.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a noise filter. BACKGROUND

[0002] A noise filter attached to a shielded cable is known (for example, refer to Patent Literature 1 described below). The noise filter described in Patent Literature 1 described below is provided with a split-shaped magnetic core and a support housing made of an electrically conductive resin or to which an electrically conductive foil is attached. If such a noise filter is used, the magnetic core can be disposed inside a shield structure composed of a shield braid possessed by the shielded cable and the support housing.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. H6-310340 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, only the technology of disposing the magnetic core inside the shield structure is disclosed in Patent Literature 1 described above. Therefore, the technology of electrically connecting the shield structure as described above to a portion having a ground potential (hereinafter, also referred to as a ground portion) is not disclosed at all in Patent Literature 1 described above.

[0008] In this regard, for example, if the support housing in Patent Literature 1 described above is brought into contact with the ground portion located in the vicinity of the support housing, the two can be electrically connected. However, it is not clear whether or not the state in which the support housing and the ground portion are in proper contact can be maintained only by bringing the support housing into contact with the ground portion. In particular, in the case where the noise filter is disposed in an environment in which vibration is generated, the state of contact between the support housing and the ground portion becomes unstable with vibration of the noise filter, and it is difficult to stably maintain the electrical connection.

[0009] In one aspect of the present disclosure, it is desirable to provide a noise filter that can electrically connect a shield layer possessed by a shielded cable to a ground portion and can stably maintain the state of electrical connection.

[0010] SOLUTION TO PROBLEM

[0011] (1) One aspect of the present disclosure is a noise filter attached to a shielded cable, the noise filter including a magnetic core, a grounding member, and a housing. The magnetic core has first and second divided cores each composed of a magnetic material, and is a cylindrical magnetic body formed by combining the first and second divided cores. The grounding member is composed of an electrically conductive material, has first and second contact portions, and contacts an exposed portion that exposes a shield layer of the shielded cable on an outer peripheral side via the first contact portion. Further, the grounding member contacts a grounding portion having a ground potential via the second contact portion, thereby electrically connecting the shield layer and the grounding portion. The housing has a first housing member and a second housing member configured to be fitted to the first housing member, the first divided core and the grounding member are fitted to the first housing member, and the second divided core is fitted to the second housing member. When the second housing member is fitted to the first housing member in a state where the shielded cable is disposed between the first and second housing members, the shielded cable is disposed so as to pass through the housing, and the first and second divided cores are disposed at positions that surround an outer periphery of the shielded cable to form the magnetic core, and the grounding member is configured to contact the exposed portion via the first contact portion. The noise filter is configured such that a pressing portion is provided to the second housing member, the pressing portion contacts the shielded cable when the second housing member is fitted to the first housing member to press the shielded cable toward the grounding portion, and the shielded cable presses the grounding member toward the grounding portion when the shielded cable is pressed by the pressing portion, thereby increasing a contact pressure of the second contact portion and the grounding portion as compared with a case where the pressing portion is not provided.

[0012] According to the noise filter configured in this way, when the second housing member is fitted to the first housing member in a state where the shielded cable is disposed between the first and second housing members, the shielded cable is disposed so as to pass through the housing. At this time, the first and second divided cores are disposed at positions that surround an outer periphery of the shielded cable to form the magnetic core. Therefore, even without performing an operation of inserting one end of the shielded cable into an inner periphery of the magnetic core, the magnetic core can be attached to the outer periphery of the shielded cable. Therefore, for example, for a shielded cable for which wiring has been completed, the magnetic core can be attached afterward.

[0013] Further, when the second housing member is fitted to the first housing member, the grounding member contacts the exposed portion that exposes the shield layer of the shielded cable on the outer peripheral side via the first contact portion. Further, the grounding member contacts the grounding portion via the second contact portion. Therefore, the shield layer and the grounding portion can be electrically connected via the grounding member, and the potential of the shield layer and the ground potential can be made the same potential.

[0014] Further, when the second housing member is assembled to the first housing member, the pressing portion contacts the shielded cable and presses the shielded cable toward the grounding portion. At this time, the shielded cable pressed by the pressing portion presses the grounding member toward the grounding portion. Therefore, the contact pressure of the second contact portion with the grounding portion becomes higher than in a case where the same pressing portion is not provided. Therefore, the electrically connected state of the second contact portion with the grounding portion can be stably maintained compared to the case where the same pressing portion is not provided.

[0015] (2) In one aspect of the present disclosure, the first contact portion can be configured by an elastic clamping piece that elastically deforms with contact with the exposed portion and clamps the exposed portion by an elastic force generated by the elastic deformation.

[0016] According to the noise filter configured in this way, the first contact portion is configured by the elastic clamping piece as described above. Therefore, the elastic clamping piece elastically deforms with contact with the exposed portion and clamps the exposed portion by an elastic force generated by the elastic deformation. Therefore, the contact pressure of the first contact portion with the exposed portion becomes higher than in a case where the first contact portion does not elastically deform, and the electrically connected state of the first contact portion with the exposed portion can be stably maintained.

[0017] (3) In one aspect of the present disclosure, the second contact portion can be configured by an elastic pressing piece that elastically deforms with contact with the grounding portion and presses the grounding portion by an elastic force generated by the elastic deformation.

[0018] According to the noise filter configured in this way, the second contact portion is configured by the elastic pressing piece as described above. Therefore, the elastic pressing piece elastically deforms with contact with the grounding portion and presses the grounding portion by an elastic force generated by the elastic deformation. Therefore, the contact pressure of the second contact portion with the grounding portion becomes higher than in a case where the second contact portion does not elastically deform, and the electrically connected state of the second contact portion with the grounding portion can be stably maintained.

[0019] (4) In one aspect of the present disclosure, the magnetic core and the grounding member can be disposed at positions adjacent in the axial direction of the shielded cable. The first housing member can have two through holes through which the shaft portions of the mounting bolts pass when the first housing member is assembled to the mounting target portion. The through directions of the two through holes can be the same direction, and the two through holes can be formed at positions having rotational symmetry such that the positions of the two through holes are exchangeable with each other by rotating the housing by 180 degrees about a plane orthogonal to the through directions. The passage through which the shielded cable passes in the housing can be formed at a position having rotational symmetry such that the positions of the center axes of the passage before and after the rotation do not change when the housing is rotated by 180 degrees in such a manner that the positions of the two through holes are exchanged.

[0020] According to the noise filter configured in this way, by rotating the housing by 180 degrees along a surface orthogonal to the penetration direction of the through holes, the positions of the two through holes can be exchanged. At this time, the position with respect to the center axis of the passage through which the shielded cable penetrates can be maintained at a position that does not change before and after the rotation. The magnetic body core and the ground member are disposed at positions adjacent in the axial direction of the shielded cable, so the positions of the magnetic body core and the ground member are exchanged with each other before and after the above-mentioned rotation. Therefore, if the noise filter is rotated by 180 degrees, the positions of the magnetic body core and the ground member can be exchanged even without changing the positions of the bolts for mounting and the position of the shielded cable.

[0021] (5) In one aspect of the present disclosure, the housing can be provided with a bite portion that bites into the shielded cable from the outer peripheral side when the second housing part is fitted to the first housing part after the shielded cable is disposed at the position of the passage, whereby relative displacement of the shielded cable with respect to the housing can be suppressed. The bite portions can be provided at positions on the side opposite the ground member side across the magnetic body core, between the magnetic body core and the ground member, and on the side opposite the magnetic body core side across the ground member, respectively.

[0022] According to the noise filter configured in this way, the bite portions bite into the shielded cable from the outer peripheral side, whereby relative displacement of the shielded cable with respect to the housing can be suppressed. Furthermore, the bite portions are provided at positions on the side opposite the ground member side across the magnetic body core, between the magnetic body core and the ground member, and on the side opposite the magnetic body core side across the ground member, respectively. Therefore, displacement of the shielded cable can be suppressed on the magnetic body core side and the ground member side, respectively. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A is a perspective view of the noise filter in a state in which the housing is closed. Figure 1 B is a perspective view of the noise filter in a state in which the housing is open.

[0024] Figure 2 A is a plan view of the noise filter. Figure 2 B is a left side view of the noise filter. Figure 2 C is a front view of the noise filter. Figure 2 D is a right side view of the noise filter. Figure 2 E is a rear view of the noise filter. Figure 2 F is a bottom view of the noise filter.

[0025] Figure 3 A is a perspective view of the noise filter in a state in which the housing is closed. Figure 3 B is a perspective view of the noise filter in a state in which the housing is open.

[0026] Figure 4 A is a front view of a noise filter in a state of being attached to a shielded cable. Figure 4 B is Figure 4 A is a sectional view of a cutaway portion indicated by the IVB-IVB line.

[0027] Figure 5 A is a perspective view of a grounding member. Figure 5 B is Figure 4 A is a sectional view of a cutaway portion indicated by the VB-VB line.

[0028] Figure 6 A is a plan view of a case in an open state. Figure 6 B is a perspective view of a case in an open state.

[0029] Explanation of Reference Numerals

[0030] 1: noise filter; 3: magnetic core; 3A: first divided core; 3B: second divided core; 5: grounding member; 5A: first contact portion; 5B: second contact portion; 7: case; 7A: first case part; 7B: second case part; 7C: hinge portion; 11: first engagement portion; 12: second engagement portion; 13: fixed portion; 15: through-hole; 21: claw portion; 23: groove portion; 25: spring portion; 27: catch portion; 29: mounting hole; 31: pressing portion; 33: passage; 35: bite-in portion. DETAILED DESCRIPTION

[0031] Next, exemplary embodiments will be described with respect to the above-described noise filter.

[0032] [Configuration of Noise Filter]

[0033] As shown in Figure 1 A, Figure 1 B, Figure 2 A, Figure 2 B, Figure 2 C, Figure 2 D, Figure 2 E, Figure 2 F and Figure 4 B, the noise filter 1 includes a magnetic core 3, a grounding member 5, and a case 7. As shown in Figure 3 A, Figure 3 B and Figure 4 A, the noise filter 1 is attached to a shielded cable 91.

[0034] As shown in Figure 1 B and Figure 3 B, the magnetic core 3 includes a first divided core 3A and a second divided core 3B. The first divided core 3A and the second divided core 3B are each made of a magnetic material (e.g., ferrite). As shown inFigure 4 As shown in Figure B, the magnetic core 3 is a cylindrical magnetic body formed by combining the first segmented core 3A and the second segmented core 3B. More specifically, the first segmented core 3A and the second segmented core 3B are formed by combining a cylindrical object with a central axis C2 (see reference). Figure 2 The imaginary plane (A, etc.) is divided into two semi-cylindrical objects. These are combined to form a cylindrical magnetic core 3. It should be noted that when a shielded cable 91 is provided, the central axis C2 is a straight line along the longitudinal direction of the shielded cable 91, through which the center of the shielded cable 91 passes.

[0035] like Figure 1 A, Figure 1 B. Figure 3 A, Figure 3 B. Figure 5 A and Figure 5 As shown in Figure B, the grounding member 5 has a first contact portion 5A and a second contact portion 5B. The grounding member 5 is made of a conductive material (in this embodiment, a copper alloy). Figure 5 As shown in Figure B, the shielded cable 91 illustrated in this embodiment consists of four signal lines 93 bundled together, with a shielding layer 95 covering its outer periphery, and then a sheath 97 covering its outer periphery. It should be noted that the first contact portion 5A and the second contact portion 5B are electrically connected to each other.

[0036] like Figure 3 B and Figure 5 As shown in Figure B, the shielded cable 91 has an exposed portion 95A, which exposes the shielding layer 95 on its outer periphery by partially peeling off the sheath 97. The grounding member 5 contacts the exposed portion 95A of the shielding layer 95 via a first contact portion 5A. Furthermore, as... Figure 5 As shown in Figure B, the grounding member 5 contacts the grounding portion 99, which has a grounding potential, via the second contact portion 5B. Thus, the grounding member 5 electrically connects the shielding layer 95 to the grounding portion 99. It should be noted that the grounding portion 99 is at least a part (e.g., the mounting target portion described later) of a conductive component disposed outside the noise filter 1.

[0037] like Figure 5 As shown in Figure B, the first contact portion 5A is configured as an elastic clamping piece that clamps the exposed portion 95A of the shielding layer 95 from both sides in the front-rear direction as shown in the figure. In the unloaded state, this elastic clamping piece has a gap shape narrower than the diameter of the exposed portion 95A of the shielding layer 95. When the exposed portion 95A of the shielding layer 95 is inserted into this gap, the elastic clamping piece elastically deforms in the direction of widening gap upon contact with the exposed portion 95A, using the elastic force generated by this elastic deformation to clamp the exposed portion 95A.

[0038] like Figure 5As shown in FIG. 5B, the second contact portion 5B is configured as an elastic presser that presses the ground portion 99 downward in the drawing. The elastic presser is elastically deformed with contact with the ground portion 99, and presses the ground portion 99 using the elastic force generated with the elastic deformation.

[0039] The housing 7 has a first housing member 7A and a second housing member 7B. In the case of the present embodiment, as shown in Figure 1 A, Figure 1 B, Figure 2 E, Figure 3 A, Figure 3 B, Figure 4 B and Figure 5 B, the first housing member 7A and the second housing member 7B are configured to be openable and closable by being connected via three hinge portions 7C. As shown in Figure 4 A and Figure 4 B, three first engagement portions 11 are provided in the first housing member 7A, and three second engagement portions 12 are provided in the second housing member 7B.

[0040] When the first housing member 7A and the second housing member 7B are closed as shown in Figure 1 A, the three first engagement portions 11 and the corresponding three second engagement portions 12 are engaged with each other one-to-one, and the state in which the first housing member 7A and the second housing member 7B are closed is maintained. When the engagement of the three first engagement portions 11 and the three second engagement portions 12 is released, the first housing member 7A and the second housing member 7B can be opened as shown in Figure 1 B.

[0041] In the case of the present embodiment, the first housing member 7A and the second housing member 7B are integrally molded with the hinge portions 7C by a resin material (for example, polyamide). However, in order to configure the structure of the openable and closable housing 7, it is sufficient that the second housing member 7B is configured to be detachable with respect to the first housing member 7A. Therefore, whether or not the above-described hinge portions 7C are provided is arbitrary.

[0042] For example, instead of the hinge portions 7C, an engagement mechanism equivalent to the above-described first engagement portions 11 and the second engagement portions 12 can be provided, whereby the second housing member 7B can be detachable with respect to the first housing member 7A. That is, if the second housing member 7B is configured to be attachable to the first housing member 7A, the first housing member 7A and the second housing member 7B can be an integrally molded product connected via the hinge portions 7C, or can be separate resin molded products not connected.

[0043] The first housing member 7A is configured to be attachable to a mounting target portion. In the case of the present embodiment, the mounting target portion is the above-described ground portion 99 (refer to Figure 5B), for example, a frame, a panel, a chassis, or the like made of metal can be used. In the case of the present embodiment, as shown in Figure 1 A, Figure 2 A and Figure 2 F, two fixing portions 13 are provided in the first housing member 7A. Through holes 15 are formed in each of the fixing portions 13.

[0044] When the first housing member 7A is assembled to the mounting target portion, for example, a nut (i.e., a threaded hole) is formed in advance in the mounting target portion. Then, the shaft portion of a bolt (e.g., a hexagonal bolt) is passed through the through hole 15 of the fixing portion 13, and the bolt is screwed with the nut formed in the mounting target portion, and if the bolt is tightened, the first housing member 7A can be fixed to the mounting target portion.

[0045] Alternatively, for example, a bolt (i.e., a threaded shaft) is erected in advance in the mounting target portion. Then, the first housing member 7A is arranged in the mounting target portion in such a manner that the bolt is passed through the through hole 15 of the fixing portion 13, and a nut (e.g., a hexagonal nut) is screwed with the bolt, and if the nut is tightened, the first housing member 7A can be fixed to the mounting target portion.

[0046] As shown in Figure 1 B and Figure 3 B, the first divided core 3A and the grounding member 5 are assembled to the first housing member 7A.

[0047] As shown in Figure 6 A and Figure 6 B, three claw portions 21 are formed in the first housing member 7A, and these claw portions 21 are engaged with the groove portions 23 of the first divided core 3A as shown in Figure 4 B, whereby the first divided core 3A is assembled to the first housing member 7A. Further, as shown in Figure 2 F and Figure 4 B, two spring portions 25 are provided in the first housing member 7A. These two spring portions 25 are elastically deformed in contact with the first divided core 3A, and the first divided core 3A is urged upward in Figure 4 B by the elastic force generated by the elastic deformation.

[0048] As shown in Figure 1 B and Figure 3 B, the second divided core 3B is assembled to the second housing member 7B. As shown in Figure 6 A and Figure 6 B, three claw portions 21 are formed in the second housing member 7B, and these claw portions 21 are engaged with the groove portions 23 of the second divided core 3B as shown in Figure 4 B, whereby the second divided core 3B is assembled to the second housing member 7B. Further, as shown in Figure 2 A and Figure 4As shown in Figs. 3B and 4B, two spring portions 25 are provided in the second housing member 7B. These two spring portions 25 are elastically deformed in contact with the second divided core 3B, and the second divided core 3B is pressed toward the first divided core 3A by the elastic force generated by the elastic deformation. Figure 4 The lower force in Fig. 3B.

[0049] With these configurations, the first divided core 3A and the second divided core 3B are pressed in the direction in which the contact pressure toward each other is increased, and the magnetic characteristics of the magnetic core 3 are improved.

[0050] As shown in Figs. 3B and 4B, the first divided core 3A and the second divided core 3B are pressed in the direction in which the contact pressure toward each other is increased, and the magnetic characteristics of the magnetic core 3 are improved. Figure 5 B and Figure 6 As shown in Figs. 3A and 4A, a snap portion 27 is provided in the first housing member 7A. This snap portion 27 is inserted into the mounting hole 29 (see Figs. 3B and 4B) of the ground member 5, and thus the ground member 5 is fitted to the first housing member 7A. Figure 5 A and Figure 5 B), and thus the ground member 5 is fitted to the first housing member 7A.

[0051] As shown in Figs. 3B and 4B, the first divided core 3A and the second divided core 3B are pressed in the direction in which the contact pressure toward each other is increased, and the magnetic characteristics of the magnetic core 3 are improved. Figure 3 B, the noise filter 1 is attached to the outer periphery of the shielded cable 91. Figure 3 A, the noise filter 1 is attached to the outer periphery of the shielded cable 91.

[0052] When the second housing member 7B is fitted to the first housing member 7A, the shielded cable 91 is disposed at a position of the through housing 7 as shown in Figs. 3A and 4A. Further, as shown in Figs. 3B and 4B, the first divided core 3A and the second divided core 3B are disposed at positions surrounding the outer periphery of the shielded cable 91 to constitute the magnetic core 3. Further, as shown in Figs. 3B and 4B, the ground member 5 is in contact with the exposed portion 95A of the shield layer 95 through the first contact portion 5A. The magnetic core 3 and the ground member 5 are disposed at positions adjacent to each other in the axial direction of the shielded cable 91. Figure 3 A, the noise filter 1 is attached to the outer periphery of the shielded cable 91. Figure 4 B, the noise filter 1 is attached to the outer periphery of the shielded cable 91. Figure 5 B, the noise filter 1 is attached to the outer periphery of the shielded cable 91.

[0053] Further, in the case of the present embodiment, when the first housing member 7A is fitted to the mounting target portion, the ground member 5 is in contact with the ground portion 99 through the second contact portion 5B as shown in Figs. 3B and 4B. In the case of the present embodiment, the mounting target portion itself functions as the ground portion 99. However, it is also possible to configure such that a part of the mounting target portion functions as the ground portion 99. Figure 5 As shown in Figs. 3B and 4B, the first divided core 3A and the second divided core 3B are pressed in the direction in which the contact pressure toward each other is increased, and the magnetic characteristics of the magnetic core 3 are improved.

[0054] As shown in Figs. 3B and 4B, the first divided core 3A and the second divided core 3B are pressed in the direction in which the contact pressure toward each other is increased, and the magnetic characteristics of the magnetic core 3 are improved. Figure 1 B, the noise filter 1 is attached to the outer periphery of the shielded cable 91. Figure 3 B, the noise filter 1 is attached to the outer periphery of the shielded cable 91. Figure 5 B, the noise filter 1 is attached to the outer periphery of the shielded cable 91. Figure 5As shown in FIG. 9B, when the second housing part 7B is fitted to the first housing part 7A, the pressing part 31 contacts the shielded cable 91 and presses the shielded cable 91 toward the grounding part 99. When the shielded cable 91 is pressed by the pressing part 31, the shielded cable 91 presses the grounding member 5 toward the grounding part 99. Therefore, when such a pressing part 31 is provided, the contact pressure of the second contact part 5B with the grounding part 99 becomes higher than in the case where the pressing part 31 is not provided.

[0055] Further, the shielded cable 91 is sandwiched between the pressing part 31 and the grounding member 5 when the shielded cable 91 is arranged in the passage 33 (see Figure 2 B and Figure 2 D) of the through housing 7. Thus, the shielded cable 91 is arranged straight in the position of the central axis C2 of the passage 33 as shown in Figure 2 A, Figure 2 C, Figure 2 E and Figure 2 F between the pressing part 31 and the grounding member 5. Therefore, unlike in the case where a configuration corresponding to the pressing part 31 is not present, even if the shielded cable 91 is subjected to an elastic force from the first contact part 5A, the shielded cable 91 can be inhibited from being deflected in the upward direction in the drawing at the position where the elastic force is applied. Therefore, the application of an excessive load to the shielded cable 91 due to the generation of such deflection can be prevented.

[0056] The two through holes 15 provided in the first housing part 7A are formed in positions having rotational symmetry in which the positions of the through holes 15 can be exchanged with each other by rotating the housing 7 by 180 degrees in a plane orthogonal to the through direction (the upward and downward directions in the drawing). More specifically, the two through holes 15 have rotational symmetry in which the positions of the through holes 15 are exchanged with each other when the housing 7 is rotated by 180 degrees about the axis C1 as shown in Figure 2 B, Figure 2 C, Figure 2 D and Figure 2 E. That is, the positions having rotational symmetry mean a plurality of positions on the same circumference with the axis (here, C1) as the center.

[0057] The passages 33 (see Figure 2 B and Figure 2 D) through which the shielded cable 91 passes in the housing 7 are formed in positions having rotational symmetry in which the positions of the central axes C2 of the passages 33 do not change before and after the housing 7 is rotated by 180 degrees in such a manner that the positions of the two through holes 15 are exchanged with each other. Figure 2 A, Figure 2 C, Figure 2 E and Figure 2 F.

[0058] Therefore, even if the housing 7 is rotated 180 degrees with the axis C1 as the center of rotation to exchange the positions of the two through holes 15, the noise filter 1 can be fitted to the mounting target site without changing the positions of the mounting bolts and the positions of the shielded cable 91. Therefore, if the noise filter 1 is rotated 180 degrees, the positions of the magnetic body core 3 and the grounding member 5 can be exchanged without changing the positions of the mounting bolts and the positions of the shielded cable 91.

[0059] As shown in Figure 6 A and Figure 6 B, the housing 7 is provided with a bite portion 35. When the second housing part 7B is fitted to the first housing part 7A after the shielded cable 91 is arranged at a position that becomes the passage 33 (refer to Figure 2 B and Figure 2 D), the bite portion 35 bites into the shielded cable 91 from the outer peripheral side. Thereby, the bite portion 35 suppresses the relative displacement of the shielded cable 91 with respect to the housing 7.

[0060] In the case of the present embodiment, as shown in Figure 6 A and Figure 6 B, the bite portion 35 is provided at a position on the side opposite the grounding member 5 side across the magnetic body core 3, a position between the magnetic body core 3 and the grounding member 5, and a position on the side opposite the magnetic body core 3 side across the grounding member 5, respectively. If the bite portion 35 is provided at such positions, the displacement of the shielded cable 91 can be suppressed on the magnetic body core 3 side and the grounding member 5 side, respectively.

[0061] [Effects]

[0062] According to the noise filter 1 configured in the above-described manner, when the second housing part 7B is fitted to the first housing part 7A in a state in which the shielded cable 91 is arranged between the first housing part 7A and the second housing part 7B, the shielded cable 91 is arranged at a position that passes through the housing 7. At this time, the first divided core 3A and the second divided core 3B are arranged at positions that surround the outer periphery of the shielded cable 91 to configure the magnetic body core 3. Therefore, even if the work of inserting one end of the shielded cable 91 into the inner periphery of the magnetic body core 3 is not performed, the magnetic body core 3 can be attached to the outer periphery of the shielded cable 91. Therefore, for example, for a shielded cable 91 for which wiring has been completed, the magnetic body core 3 can be attached afterward.

[0063] Further, when the second housing part 7B is fitted to the first housing part 7A, the grounding member 5 comes into contact with the exposed portion 95A that exposes the shield layer 95 possessed by the shielded cable 91 on the outer peripheral side through the first contact portion 5A. Further, the grounding member 5 comes into contact with the grounding portion 99 through the second contact portion 5B. Therefore, the shield layer 95 and the grounding portion 99 can be electrically connected via the grounding member 5, and the potential of the shield layer 95 and the ground potential can be made the same potential.

[0064] Further, when the second housing member 7B is fitted to the first housing member 7A, the pressing portion 31 contacts the shielded cable 91 and presses the shielded cable 91 toward the ground portion 99. At this time, the shielded cable 91 pressed by the pressing portion 31 presses the ground member 5 toward the mounting target portion. Therefore, the contact pressure of the second contact portion 5B with the ground portion 99 becomes higher than in the case where the same pressing portion 31 is not provided. Thus, the electrically connected state of the second contact portion 5B with the ground portion 99 can be stably maintained.

[0065] Further, in the case of the present embodiment, the first contact portion 5A is configured as the elastic clamping piece as described above. Therefore, the contact pressure of the first contact portion 5A with the exposed portion 95A becomes higher than in the case where the first contact portion 5A does not elastically deform, and the electrically connected state of the first contact portion 5A with the exposed portion 95A can be stably maintained.

[0066] Further, in the case of the present embodiment, the second contact portion 5B is configured as the elastic pressing piece as described above. Therefore, the contact pressure of the second contact portion 5B with the ground portion 99 becomes higher than in the case where the second contact portion 5B does not elastically deform, and the electrically connected state of the second contact portion 5B with the ground portion 99 can be stably maintained.

[0067] Further, in the case of the present embodiment, if the noise filter 1 is rotated by 180 degrees, the positions of the magnetic core 3 and the ground member 5 can be exchanged even without changing the positions of the mounting bolts and the shielded cable 91.

[0068] Further, in the case of the present embodiment, the bite-in portion 35 is provided at the position as described above, and thus the displacement of the shielded cable 91 can be suppressed on both the magnetic core 3 side and the ground member 5 side.

[0069] [Other Embodiments]

[0070] The above describes exemplary embodiments of the noise filter 1, but the above-described embodiments are merely exemplified as one aspect of the present disclosure. That is, the present disclosure is not limited to the above-described exemplary embodiments, and can be implemented in various ways without departing from the technical idea of the present disclosure.

[0071] For example, in the above-described embodiments, the elastic pressing piece configuring the second contact portion 5B is of a shape extending toward the obliquely lower front and the obliquely lower rear in the drawing, but the elastic pressing piece can be of a shape extending toward the obliquely lower left and the obliquely lower right in the drawing.

[0072] Further, in the above-described embodiment, one of the magnetic core 3 and the ground member 5 is provided in the housing 7, but two or more of the magnetic core 3 and the ground member 5 can be provided. In this case, the order of arrangement of the magnetic core 3 and the ground member 5 can be any order.

[0073] Further, in the above-described embodiment, the magnetic core 3 is described as a magnetic body in a cylindrical shape, but a magnetic body in a shape other than a cylindrical shape can be observed Figure 4 B, it is to be noted that the cylindrical shape in the present specification is not limited to a strict cylindrical shape, and the shield cable 91 can have a shape that can pass through the inner periphery of the magnetic core 3. For example, in the case of the above-described embodiment, as shown in Figure 4 B, the outer periphery of the magnetic core 3 includes a portion formed of a curved surface, a portion formed of a flat surface, and a portion in which the groove portion 23 is formed, and the like. Such a shape of the magnetic core 3 also corresponds to one example of the cylindrical shape in the present specification.

[0074] That is, in the magnetic core 3 in the cylindrical shape in the present specification, the shape of the outer peripheral surface and the inner peripheral surface is not limited to a specific shape. Therefore, the shape of the outer peripheral surface and the inner peripheral surface of the magnetic core 3 can be any one of the following shapes: a shape in which the cross-sectional shape perpendicular to the axial direction of the magnetic core 3 is circular, a shape in which the cross-sectional shape is a polygonal shape such as a quadrangular shape or a hexagonal shape, and a shape in which the cross-sectional shape is different from a circular shape or a polygonal shape.

[0075] Further, the first divided core 3A and the second divided core 3B of the above-described embodiment are configured to have the same shape, but the first divided core 3A and the second divided core 3B can have different shapes. For example, the magnetic core can be configured to have a square cylindrical shape in which the cross-sectional shape perpendicular to the axial direction is substantially quadrangular, and in this case, it can be configured such that three sides of the substantially quadrangular shape are formed of the first divided core and one side of the substantially quadrangular shape is formed of the second divided core.

[0076] Further, in the above-described embodiment, an example in which the mounting target portion of the first housing part 7A functions as the ground portion 99 is shown, but the mounting target portion of the first housing part 7A and the ground portion 99 can be separate. For example, in the above-described embodiment, the two fixing portions 13 are configured to have a shape in which the mounting target portion is assumed to exist on the lower side in the drawing of the noise filter 1, but it can be configured to have a shape in which the mounting target portion is assumed to exist on the front side in the drawing or the rear side in the drawing. In this case, a metal part (for example, a metal bracket) or the like that functions as the ground portion 99 can be arranged on the lower side in the drawing of the noise filter 1 separately from the mounting target portion.

[0077] Note that a plurality of functions realized by one constitutional element exemplified in the above-described embodiments can be realized by a plurality of constitutional elements. Also, one function realized by one constitutional element exemplified in the above-described embodiments can be realized by a plurality of constitutional elements. Also, a plurality of functions realized by a plurality of constitutional elements exemplified in the above-described embodiments can be realized by one constitutional element. Also, one function realized by a plurality of constitutional elements exemplified in the above-described embodiments can be realized by one constitutional element. Also, a part of the constitution exemplified in the above-described embodiments can be omitted.

[0078] [Technical idea disclosed in the present specification]

[0079] [Item 1]

[0080] A noise filter in which

[0081] The noise filter is configured to be attached to a shielded cable having a shield layer, and has an exposed portion configured to expose the shield layer on an outer peripheral side,

[0082] The noise filter has:

[0083] a magnetic core having a first divided core and a second divided core each composed of a magnetic material, the magnetic core being a cylindrical magnetic body composed of the first divided core and the second divided core combined;

[0084] a grounding member composed of an electrically conductive material, having a first contact portion and a second contact portion, the first contact portion being in contact with the exposed portion of the shielded cable, and the second contact portion being in contact with a grounding portion having a ground potential, thereby electrically connecting the shield layer and the grounding portion; and

[0085] a housing having a first housing part and a second housing part, the second housing part being configured to be fitted to the first housing part, the first divided core and the grounding member being fitted to the first housing part, and the second divided core being fitted to the second housing part,

[0086] when the second housing part is fitted to the first housing part in a state where the shielded cable is disposed between the first housing part and the second housing part, the shielded cable is disposed so as to pass through the housing, and the first divided core and the second divided core are disposed so as to surround an outer periphery of the shielded cable to constitute the magnetic core, and the grounding member is configured to be in contact with the exposed portion via the first contact portion,

[0087] The second housing member is provided with a pressing portion configured to contact the shielded cable and press the shielded cable toward the grounding portion when the second housing member is assembled to the first housing member,

[0088] The noise filter is configured such that, when the shielded cable is pressed by the pressing portion, the shielded cable presses the grounding member toward the grounding portion, and thus the contact pressure of the second contact portion with the grounding portion is higher than in a case where the pressing portion is not provided.

[0089] [Item 2]

[0090] The noise filter according to Item 1, wherein

[0091] The first contact portion is configured by an elastic clamping piece that elastically deforms in contact with the exposed portion and clamps the exposed portion by an elastic force generated by the elastic deformation.

[0092] [Item 3]

[0093] The noise filter according to Item 1 or 2, wherein

[0094] The second contact portion is configured by an elastic pressing piece that elastically deforms in contact with the grounding portion and presses the grounding portion by an elastic force generated by the elastic deformation.

[0095] [Item 4]

[0096] The noise filter according to any one of Items 1 to 3, wherein

[0097] The magnetic core and the grounding member are disposed at positions adjacent in an axial direction of the shielded cable,

[0098] The first housing member has two through holes through which a shaft portion of a mounting bolt passes when the first housing member is assembled to a mounting target portion,

[0099] The through directions of the two through holes are the same direction, and the two through holes are formed at positions having rotational symmetry such that the positions of the two through holes are exchangeable with each other by rotating the housing by 180 degrees about a plane orthogonal to the through directions,

[0100] The passage through which the shielded cable passes in the housing is formed at a position having rotational symmetry such that the position of a central axis of the passage does not change before and after the rotation when the housing is rotated by 180 degrees in such a manner that the positions of the two through holes are exchanged.

[0101] [Item 5]

[0102] The noise filter according to item 4, wherein

[0103] A bite portion is provided in the housing, and when the second housing part is fitted to the first housing part after the shielded cable is arranged at a position that becomes the passage, the bite portion bites into the shielded cable from the outer peripheral side, thereby suppressing relative displacement of the shielded cable with respect to the housing,

[0104] The bite portions are provided at positions on the side opposite to the ground member side across the magnetic body core, between the magnetic body core and the ground member, and on the side opposite to the magnetic body core side across the ground member, respectively.

Claims

1. A noise filter, wherein, The noise filter is configured to be mounted on a shielded cable, the shielded cable having a shielding layer and an exposed portion configured to expose the shielding layer on its outer periphery. The noise filter has the following features: A magnetic core having a first segmented core and a second segmented core respectively made of magnetic material, the magnetic core being a cylindrical magnetic body formed by combining the first segmented core and the second segmented core; A grounding member, which is made of conductive material, has a first contact portion and a second contact portion. The first contact portion contacts the exposed portion of the shielded cable, and the second contact portion contacts a grounding portion having a grounding potential, thereby electrically connecting the shielding layer to the grounding portion. and The housing has a first housing part and a second housing part, the second housing part being configured to be assembled to the first housing part. The first housing part is fitted with the first dividing core and the grounding member, and the second housing part is fitted with the second dividing core. When the second housing part is assembled to the first housing part with the shielded cable positioned between the first housing part and the second housing part, the shielded cable is configured to penetrate the housing, and the first and second segmented cores are configured to surround the outer periphery of the shielded cable to form the magnetic core, and the grounding member is configured to contact the exposed portion through the first contact portion. The second housing component has a pressing part, which is configured to contact the shielded cable and press the shielded cable toward the grounding part when the second housing component is assembled to the first housing component. The noise filter is configured such that when the shielded cable is pressed by the pressing part, the shielded cable presses the grounding member toward the grounding part, thereby increasing the contact pressure between the second contact part and the grounding part compared to the case where the pressing part is not provided.

2. The noise filter according to claim 1, wherein, The first contact portion is composed of an elastic clamping piece, which elastically deforms upon contact with the exposed portion, and clamps the exposed portion by the elastic force generated by the elastic deformation.

3. The noise filter according to claim 1 or 2, wherein, The second contact portion is composed of an elastic pressing piece, which elastically deforms upon contact with the grounding portion, and presses the grounding portion by the elastic force generated by the elastic deformation.

4. The noise filter according to claim 1 or 2, wherein, The magnetic core and the grounding member are positioned adjacent to each other in the axial direction of the shielded cable. The first housing part has two through holes through which the shaft portion of the mounting bolt passes when the first housing part is assembled to the mounting object. The two through holes are oriented in the same direction and are formed in a rotationally symmetrical position where their positions can be interchanged by rotating the housing 180 degrees along a plane orthogonal to the through direction. The passageway through which the shielded cable passes in the housing is formed in a rotationally symmetrical position where the position of the central axis of the passageway remains unchanged before and after the housing is rotated 180 degrees in such a manner as to interchange the positions of the two through holes.

5. The noise filter according to claim 4, wherein, When the second housing part is assembled to the first housing part after the shielded cable is positioned at the location that forms the passage, the biting part engages with the shielded cable from the outer peripheral side, thereby suppressing relative displacement of the shielded cable relative to the housing. The biting portions are respectively located at a position opposite to the grounding member side, a position between the magnetic core and the grounding member, and a position opposite to the magnetic core side, separated by the grounding member.

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