Electromagnetic noise countermeasure member

Abstract

Provided is an electromagnetic noise countermeasure member that can reduce resonance of a noise countermeasure member even when vibration occurs at a mounting portion of the noise countermeasure member. An electromagnetic noise countermeasure member (1) that is mounted to a prescribed portion by a mounting member (60) and is secured by a securing member (63) that constitutes the mounting member, the electromagnetic noise countermeasure member including: a magnetic core for surrounding a periphery of an electric wire; and a holding member (10, 50) for holding the magnetic core to an inner surface thereof, the securing member being made of metal, an insertion opening (22) for inserting the securing member being formed in the holding member, and an elastic member (30) being mounted, the elastic member securing the securing member that is inserted into the insertion opening and being elastically deformed by vibration of the securing member.

Description

TECHNICAL FIELD

[0001] The technology disclosed in this application relates to an electromagnetic noise countermeasure member for reducing electromagnetic noise propagating in an electric wire. BACKGROUND

[0002] In the past, as such an electromagnetic noise countermeasure member, an electromagnetic noise countermeasure member having a magnetic core, a case housing the magnetic core, a support member receiving portion provided to the case, a gap formed in the support member receiving portion, and a support member inserted into the gap, in which when the support member is inserted into the gap, a detent portion is engaged with a through hole of the support member (Patent Literature 1) has been known.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2017-103307 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a vehicle such as an automobile, since there are many electric wires, it is an important problem in preventing misoperation of the vehicle to reduce electromagnetic noise propagating in the electric wires or electromagnetic noise radiating from the electric wires. Furthermore, in the process of introducing an automatic driving technology of the vehicle, misoperation of the vehicle is a matter of life and death, and thus electromagnetic noise countermeasures become an especially important problem.

[0008] Further, in a vehicle such as an automobile, various vibrations such as vibrations of an engine, a motor, vibrations from a road surface, and the like occur. Therefore, it is presumed that when the vibrations are transmitted to the electromagnetic noise countermeasure member, the amplitude of the vibrations of the electromagnetic noise countermeasure member becomes large, and it can cause some influence on the electromagnetic noise countermeasure member.

[0009] Therefore, the present inventors have developed a technology of reducing the amplitude of vibrations of the electromagnetic noise countermeasure member by fixing a holding member (a case) holding a magnetic core to a vehicle body with a mounting member (Patent Literature 1).

[0010] However, the present inventors have found a new problem through later research. That is, it is presumed that even if the holding member is fixed to the vehicle body with the mounting member, the vibrations of the vehicle body are transmitted to the holding member via the mounting member, and the holding member resonates, and thus it can cause breakage such as a defect, a crack, and the like of the magnetic core. In particular, it is presumed that in a structure in which the magnetic core is constituted by making magnetic core parts abut against each other, breakage such as a defect, a crack, and the like of the magnetic core is easily caused by vibrations.

[0011] Therefore, the technology disclosed in the present application is created to solve the above problems, and aims to provide an electromagnetic noise countermeasure member that can reduce resonance of a holding member even when a mounting portion of the holding member that holds a magnetic core vibrates.

[0012] Technical Solution

[0013] To achieve the above object, the electromagnetic noise countermeasure member of the technology disclosed in the present application is mounted to a prescribed portion by a mounting member, and is clamped by a clamping member that constitutes the mounting member, characterized in that the electromagnetic noise countermeasure member has: a magnetic core that surrounds a periphery of an electric wire; and a holding member that holds the magnetic core to an inner surface thereof, the clamping member is made of metal, an insertion hole for inserting the clamping member is formed in the holding member, and an elastic member is mounted, the elastic member clamps the clamping member that is inserted into the insertion hole, and is elastically deformed by vibration of the clamping member.

[0014] When the prescribed portion where the electromagnetic noise countermeasure member is mounted vibrates, the vibration is transmitted to the clamping member of the mounting member. However, the clamping member is clamped by the elastic member, the elastic member is elastically deformed by the vibration of the clamping member, and thus the vibration energy of the clamping member is absorbed by the elastic member, and thus resonance of the holding member can be reduced.

[0015] Further, since the natural vibration frequency of the elastic member is smaller than that of the clamping member made of metal, the vibration energy of the clamping member can be absorbed by the elastic member, and thus resonance of the holding member can be reduced.

[0016] Further, the electromagnetic noise countermeasure member of the technology disclosed in the present application is characterized in that a clamping hole is formed in the clamping member, and a clamping body is provided in the elastic member, the clamping body clamps the clamping hole of the clamping member that is inserted into the insertion hole, the clamping member that is inserted into the insertion hole and on which the clamping body clamps is in a state of being pressed by the elastic member.

[0017] The clamping member that is inserted into the insertion hole and on which the clamping body clamps is in a state of being pressed by the elastic member, and thus the elastic member is elastically deformed by the vibration of the clamping member, and thus the vibration energy of the clamping member is absorbed, and thus resonance of the holding member can be reduced.

[0018] Further, when the clamping member of the mounting member is inserted into the insertion hole of the holding member, the clamping body of the elastic member clamps the clamping hole of the clamping member, and thus the clamping member can be prevented from coming out of the insertion hole.

[0019] Further, the electromagnetic noise countermeasure member of the technology disclosed in the present application is characterized in that the clamping member that is inserted into the insertion hole maintains a state in which the clamping body clamps the clamping hole and can vibrate.

[0020] The locking member inserted into the insertion port can maintain the state in which the locking body of the elastic member is locked in the locking hole even if it vibrates, so it can prevent the locking member from being pulled out of the insertion port due to vibration.

[0021] Further, the electromagnetic noise countermeasure member of the technology disclosed in the present application is characterized in that the locking member is formed in a plate shape, the insertion port is formed between the first wall and the second wall facing each other, the first protruding portion capable of abutting against the first surface of the locking member inserted into the insertion port is formed protruding from the first wall toward the insertion port, the second protruding portion capable of abutting against the second surface of the locking member on the opposite side of the first surface is formed protruding from the second wall toward the insertion port, and the distance between the tip ends of the first protruding portion and the second protruding portion is longer than the plate thickness of the locking member.

[0022] The distance between the tip ends of the first protruding portion and the second protruding portion is longer than the plate thickness of the locking member, so the locking member can be displaced between the tip ends of the first protruding portion and the second protruding portion.

[0023] Therefore, the amplitude of vibration generated by the locking member becomes large, and in correspondence therewith, the vibration energy transmitted to the elastic member becomes small, so the resonance of the holding member can be further reduced.

[0024] Further, the locking member can be inserted into the insertion port in the state of abutting against the first protruding portion or the second protruding portion, so compared with the structure in which the protruding portion is not formed, the contact resistance of the locking member can be reduced, so the force required for insertion can be reduced.

[0025] Advantageous Effects

[0026] According to the electromagnetic noise countermeasure member of the technology disclosed in the present application, it is possible to provide an electromagnetic noise countermeasure member in which the resonance of the holding member can be reduced even if the installation portion of the holding member that holds the magnetic body core vibrates.

[0027] Other features and advantages of the present application will become apparent from the following description taken in conjunction with the accompanying drawings. It is noted that, in the drawings, like or similar components are marked with the same reference numerals. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

[0029] Figure 1 is a front perspective view of an electromagnetic noise countermeasure member of an embodiment of the present application.

[0030] Figure 2A is a rear view of the electromagnetic noise countermeasure member shown in Figure 1

[0031] ​Figure 2B is Figure 1 a front view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0032] Figure 3 is Figure 1 a left side view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0033] Figure 4A is Figure 1 a rear view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0034] Figure 4B is Figure 1 a rear view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0035] Figure 5A is Figure 4A a rear view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0036] Figure 5B is Figure 4A a top view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0037] Figure 6A is Figure 4A a right side view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0038] Figure 6B is Figure 4A a left side view of the electromagnetic noise countermeasure member shown in FIG. 1.

[0039] Figure 7A is Figure 4B an enlarged view of the portion shown by symbol A in FIG. 1.

[0040] Figure 7B is Figure 7A a B-B line sectional view of FIG. 1.

[0041] Figure 7C is Figure 7A a C-C line sectional view of FIG. 1.

[0042] Figure 8A is a graph showing a vibration test result.

[0043] Figure 8B is a graph showing a vibration test result.

[0044] Figure 8C is a graph showing a vibration test result.

[0045] Figure 9A is a graph showing a vibration test result.

[0046] Figure 9BThis is an explanatory diagram showing the direction of vibration in a vibration test. Detailed Implementation

[0047] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments are not limited to the invention as claimed, and that not all combinations of features described in the embodiments are necessarily necessary for the invention. Two or more features from the plurality of features described in the embodiments may be combined arbitrarily. Furthermore, the same or identical components are labeled with the same reference numerals, and repeated descriptions are omitted.

[0048] The electromagnetic noise countermeasure components of the present invention will be described with reference to the accompanying drawings.

[0049] [Main Structure]

[0050] like Figure 1 As shown, the electromagnetic noise countermeasure component 1 of this embodiment includes: a first magnetic core part 40; a second magnetic core part 41; a first holding member 10 for holding the first magnetic core part 40 on its inner surface; and a second holding member 50 for holding the second magnetic core part 41 on its inner surface. A magnetic core surrounding the wire (not shown) is formed by bringing the first magnetic core part 40 and the second magnetic core part 41 into contact with each other. The first magnetic core part 40 and the second magnetic core part 41 are each formed as a semi-cylindrical shape, cut from a cylinder along its central axis, and an annular magnetic core is formed by bringing them into contact with each other. In this embodiment, the longitudinal cross-sectional shape of the wire is circular.

[0051] Furthermore, the first retaining member 10 and the second retaining member 50 are configured to surround the wire and are capable of engaging with each other. Figure 5A and Figure 6B As shown, the first retaining member 10 has a male locking portion 11 on its left side, and the second retaining member 50 has a female locking portion 51 on its left side for locking the male locking portion 11. When the first retaining member 10 and the second retaining member 50 are joined together, the male locking portion 11 can be locked onto the female locking portion 51 to maintain the joined state of the first retaining member 10 and the second retaining member 50. The electromagnetic noise countermeasure member 1 is constructed by the joining of the first retaining member 10 and the second retaining member 50, and a through hole 3 for inserting a wire is formed in the front-rear direction. In this embodiment, the first retaining member 10 and the second retaining member 50 are both made of synthetic resin.

[0052] [Structure of mounting components]

[0053] like Figure 2BAs shown, a mounting member 60 for mounting an electromagnetic noise countermeasure member 1 to a designated location includes: a fixing member 61 for fixing the mounting member 60 to the designated location; and a locking member 63 for locking the mounting member 60 to the electromagnetic noise countermeasure member 1. The fixing member 61 and the locking member 63 are each formed in a plate shape. The fixing member 61 and the locking member 63 are arranged in a position where the plate surfaces are orthogonal to each other. A locking hole 65 is formed through the locking member 63 in the vertical direction. In this embodiment, the locking hole 65 is formed as a rectangle in plan view. A bend 62 is formed between the fixing member 61 and the locking member 63. Stepped portions 64 are formed on the left and right sides near the bend 62 in the locking member 63. The width of the stepped portions 64 on the left and right sides of the locking member 63 is smaller than that of the fixing member 61. The fixing member 61 is fixed to the designated location, such as a vehicle body, by welding or bonding. Furthermore, when the fixing member 61 has a through-hole for bolt insertion, it is fixed to a designated location by bolts. In this embodiment, the mounting member 60 is made of metal such as iron, stainless steel, or aluminum.

[0054] [Clocking Structure]

[0055] Next, the locking structure for locking the mounting member 63 to the electromagnetic noise countermeasure member 1 will be described.

[0056] like Figure 1 As shown, the electromagnetic noise countermeasure member 1 includes a locking structure 20 for locking the locking member 63 of the mounting member 60. The locking structure 20 includes a housing 21 formed on the upper part of the electromagnetic noise countermeasure member 1. The housing 21 includes an upper wall 23 and a lower wall 24 facing each other in the vertical direction. The upper wall 23 is concave when viewed from the rear, and includes: a rear wall 23a extending in the left-right direction; a right wall 23b extending forward from the right end of the rear wall 23a; and a left wall 23c extending forward from the left end of the rear wall 23a. The right wall 23b and the left wall 23c also extend downward from the rear wall 23a and are facing each other. The rear wall 23a joins the upper rear portions of the facing right wall 23b and left wall 23c. The upper wall 23 is an example of the first wall of the present invention, and the lower wall 24 is an example of the second wall of the present invention.

[0057] like Figure 4A , Figure 4B As shown, an insertion port 22 for inserting the locking member 63 is formed through the upper wall 23 and the lower wall 24 in the front-to-back direction. Figure 4A , Figure 4B as well as Figure 7AAs shown, a first upper guide 25 is formed to protrude from a lower surface of a right wall 23b constituting the upper wall 23 toward the insertion port 22, and a second upper guide 26 is formed to protrude from a lower surface of a left wall 23c constituting the upper wall 23 toward the insertion port 22. The first upper guide 25 and the second upper guide 26 each extend in the front-rear direction. In the present embodiment, the longitudinal cross-sectional shape of each of the first upper guide 25 and the second upper guide 26 is formed in a circular arc shape bulging downward. That is, the first upper guide 25 and the second upper guide 26 are each formed in a semicircular cylindrical shape. The first upper guide 25 and the second upper guide 26 are configured to be able to abut against upper surfaces of the locking members 63 inserted into the insertion port 22, respectively. Hereinafter, in the case where the common contents of the first upper guide 25 and the second upper guide 26 are described, the upper guides are sometimes referred to simply as upper guide. The first upper guide 25 and the second upper guide 26 are one example of the first protruding portion of the present application.

[0058] Further, in the lower wall 24, a first lower guide 27 is formed to protrude from a position substantially opposite the first upper guide 25 toward the insertion port 22, and a second lower guide 28 is formed to protrude from a position substantially opposite the second upper guide 26 toward the insertion port 22. A first lower guide protruding portion 27a is formed to protrude from an upper end of the first lower guide 27, and a second lower guide protruding portion 28a is formed to protrude from an upper end of the second lower guide 28. The first lower guide 27 and the second lower guide 28 each have a shape of a rib extending in the front-rear direction, and are parallel to the first upper guide 25 and the second upper guide 26, respectively. In the present embodiment, the longitudinal cross-sectional shape of each of the first lower guide protruding portion 27a and the second lower guide protruding portion 28a is formed in a circular arc shape bulging upward. That is, the first lower guide protruding portion 27a and the second lower guide protruding portion 28a are each formed in a semicircular cylindrical shape.

[0059] The first lower guide protruding portion 27a and the second lower guide protruding portion 28a are configured to be able to abut against lower surfaces of the locking members 63 inserted into the insertion port 22, respectively. Hereinafter, in the case where the common contents of the first lower guide 27 and the second lower guide 28 are described, the lower guides are sometimes referred to simply as lower guide. Further, in the case where the common contents of the first lower guide protruding portion 27a and the second lower guide protruding portion 28a are described, the lower guide protruding portions are sometimes referred to simply as lower guide protruding portion. The first lower guide 27 having the first lower guide protruding portion 27a and the second lower guide 28 having the second lower guide protruding portion 28a are one example of the second protruding portion of the present application.

[0060] As described above, the longitudinal cross-sectional shape of each of the first upper guide 25 and the second upper guide 26 is formed in a circular arc shape bulging downward, and the longitudinal cross-sectional shape of each of the first lower guide protrusion 27a and the second lower guide protrusion 28a is formed in a circular arc shape bulging upward, so that the contact resistance of the upper surface and the lower surface of the locking member 63 becomes small when the locking member 63 is inserted from the insertion port 22, and thus the force required for inserting the locking member 63 can be reduced. In other words, the locking member 63 can be easily and smoothly inserted into the insertion port 22. The upper surface of the locking member 63 is one example of the first surface of the present application, and the lower surface of the locking member 63 is one example of the second surface of the present application.

[0061] As Figure 7B shown, the elastic member 30 is provided in the housing 21 above the insertion port 22. The elastic member 30 has a fixed portion 31, a bent portion 32, a force applying portion 33, and a locking body 34. The fixed portion 31 is formed in a rectangular plate shape in plan view, and is fixed to the inside of the rear wall 23a constituting the upper wall 23. The force applying portion 33 is formed in an oblong shape long in the front-rear direction in plan view, and extends forward of the fixed portion 31. The force applying portion 33 is opposed to the fixed portion 31, and the lower surface of the force applying portion 33 forms an inclined surface slightly inclined forward. The force applying portion 33 has a first force applying portion 33a formed in the front and a second force applying portion 33b formed in the rear. The bent portion 32 is joined between the respective rear ends of the fixed portion 31 and the force applying portion 33. The force applying portion 33 is elastic, and is elastically deformable in the up-down direction.

[0062] The locking body 34 is formed on the lower surface of the force applying portion 33 downward from between the first force applying portion 33a and the second force applying portion 33b. The locking body 34 has an inclined surface 34a and a locking surface 34b. The inclined surface 34a is inclined obliquely forward from the lower surface of the force applying portion 33, and the locking surface 34b is hung down from the lower surface of the force applying portion 33. In the present embodiment, the locking body 34 is formed in the substantially center in the front-rear direction in the lower surface of the force applying portion 33. Further, the elastic member 30 is formed of synthetic resin.

[0063] In the case of locking the mounting member 60 to the electromagnetic noise countermeasure member 1, the locking member 63 of the mounting member 60 is inserted into the insertion port 22 from the rear of the electromagnetic noise countermeasure member 1. When the locking member 63 is inserted into the insertion port 22, the front end 63a of the locking member 63 comes into abutment with the inclined surface 34a of the locking body 34. Then, when the insertion of the locking member 63 is advanced, the locking body 34 is pressed by the front end 63a of the locking member 63, the force applying portion 33 is elastically deformed upward, and the locking body 34 is displaced upward. Then, when the front end 65a of the locking hole 65 of the locking member 63 comes into abutment with the locking surface 34b of the locking body 34, the locking member 63 is locked to the electromagnetic noise countermeasure member 1. Figure 2B Figure 2B ​) over the top end of the locking body 34, the force applying portion 33 is elastically deformed downward, the locking body 34 is displaced downward, and the locking body 34 is locked in the locking hole 65. Thus, as shown in FIG. 7, the lower surface of the first force applying portion 33a of the force applying portion 33 is in a state of abutting against the portion of the locking member 63 which is forward of the locking hole 65 and applying a force to the locking member 63 downward. Figure 3

[0064] Thus, the state in which the locking surface 34b of the locking body 34 is locked to the front end 65a of the locking hole 65 is maintained, and thus it is difficult to pull out the locking member 63 in the insertion direction. Moreover, the locking member 63 which is inserted into the insertion port 22 is applied with a force by the force applying portion 33 of the elastic member 30 downward, and thus can vibrate up and down while the state in which the locking body 34 is locked to the locking hole 65 is maintained, and thus it is possible to prevent the locking member 63 from being pulled out of the insertion port 22 due to vibration.

[0065] Moreover, each of the stepped portions 64 of the mounting member 60 is locked to each of the rear ends of each of the side walls 21a, 21a which are positioned left and right of the insertion port 22 in the housing 21. Figure 2B Figure 2A Thus, it is possible to make all stress applied to the locking member 63 in the insertion direction not affect the locking body 34.

[0066] Moreover, as shown in FIG. 8, the force applying portion 33 of the elastic member 30 is exposed from the space surrounded by the rear wall 23a, the right wall 23b, and the left wall 23c, and thus by using a tool to pull up the front end of the force applying portion 33 upward, it is possible to release the state in which the force applying portion 33 is locked to the locking member 63 and to pull out the locking member 63 from the insertion port 22 rearward. Figure 1 Figure 2A

[0067] [Characteristics]

[0068] The distance H between the top end of the second upper guide 26 and the top end of the second lower guide protruding portion 28a, and the distance H between the top end of the first upper guide 25 and the top end of the first lower guide protruding portion 27a are respectively longer than the plate thickness D of the locking member 63. Figure 7A Figure 2B Hereinafter, the distance H will be referred to as a guide-to-guide distance. Thus, the locking member 63 which is inserted into the insertion port 22 can form a gap between the upper guide and the lower guide. In other words, the locking member 63 which is inserted into the insertion port 22 can be displaced up and down between the upper guide and the lower guide. When the locking member 63 which is inserted into the insertion port 22 is displaced up and down, the force applying portion 33 of the elastic member 30 which applies a force to the locking member 63 is elastically deformed up and down.

[0069] ​​​​​Therefore, when the portion of the mounting member 60 in which the fixing member 61 is fixed vibrates, the vibration is transmitted to the locking member 63, and the locking member 63 vibrates up and down, but since the urging portion 33 of the elastic member 30 that urges the locking member 63 is elastically deformed up and down due to the vibration, the vibration energy of the locking member 63 is absorbed by the elastic member 30, and thus the resonance of the electromagnetic noise countermeasure member 1 in which the elastic member 30 is fixed can be reduced.

[0070] [Vibration Test]

[0071] The present inventors conducted a vibration test for confirming the effect of the present application. Hereinafter, the contents of the vibration test and the test results will be described.

[0072] 1. Test Conditions

[0073] Standard: JIS D1601-1995

[0074] Standard Name: Method of Vibration Test for Automotive Parts

[0075] Classification of Vibration Conditions: 1 kind (mainly for automobiles) A kind (a case where vibration is small since mounted on a body or a spring of a suspension device)

[0076] 2. Test Contents

[0077] (1) Resonance Point Detection Test Method

[0078] Frequency (vibration frequency): 5 to 400 Hz, Period (5 to 400 Hz): 10 min / reciprocation, Acceleration: 30 m / s 2 , Excitation direction: X-axis direction, Y-axis direction, and Z-axis direction.

[0079] (2) The relationship between the mounting posture of the electromagnetic noise countermeasure member mounted on the vibration test machine and the vibration direction (XYZ) is shown in Figure 9B .

[0080] (3) The ratio of the guide distance H to the plate thickness D of the locking member 63 was set as (H / D)%, and three kinds of electromagnetic noise countermeasure members were produced, in which (H / D)% was -11.2%, (H / D)% was -1.9%, and (H / D)% was +2.8%. Vibration tests were conducted on each of them according to the test conditions and test contents described above. The electromagnetic noise countermeasure member in which (H / D)% was +2.8% corresponds to the electromagnetic noise countermeasure member 1 of the above-described embodiment. In addition, the electromagnetic noise countermeasure member in which (H / D)% was negative indicates an electromagnetic noise countermeasure member in which the plate thickness D of the locking member 63 is longer than the guide distance H, and thus the front end 63a of the locking member is bent when the locking member 63 is inserted into the insertion port 22. Figure 2B) in the upper and lower guide protrusions Figure 7A ) are inserted at the same time. That is, the electromagnetic noise countermeasure member showing -11.2% has a higher height of the upper and lower guide protrusions than the electromagnetic noise countermeasure member showing -1.9%.

[0081] [Results of Experiment]

[0082] Figure 8A 、 Figure 8B 、 Figure 8C is a graph showing the results of the experiment in which each electromagnetic noise countermeasure member was excited in the X, Y, and Z axial directions, Figure 8A shows the results of the experiment in which each electromagnetic noise countermeasure member was excited in the X axial direction, Figure 8B shows the results of the experiment in which each electromagnetic noise countermeasure member was excited in the Y axial direction, Figure 8C shows the results of the experiment in which each electromagnetic noise countermeasure member was excited in the Z axial direction. As Figures 8A-8C indicated, each electromagnetic noise countermeasure member had several resonance points during the period in which the vibration frequency varied from 20 Hz to 400 Hz. Among them, a graph in which the maximum acceleration at the time of resonance was aggregated is shown in Figure 9A .

[0083] [Conclusion]

[0084] From the graph shown in Figure 8A 、 Figure 8B 、 Figure 8C and the chart shown in Figure 9A , it is understood that the electromagnetic noise countermeasure member showing (H / D)% of +2.8% has smaller acceleration than the other electromagnetic noise countermeasure members (-11.2%, -1.9%) in terms of the maximum acceleration of the electromagnetic noise countermeasure member at the time of resonance.

[0085] That is, it is understood that the electromagnetic noise countermeasure member showing (H / D)% of +2.8% can reduce resonance compared to the other electromagnetic noise countermeasure members (-11.2%, -1.9%) in the case where the mounting member 60 to which the electromagnetic noise countermeasure member is mounted vibrates.

[0086] The present inventors have made the following conjecture about the main factor that brought about the above results.

[0087] In the electromagnetic noise countermeasure member showing (H / D)% of +2.8%, when the locking member 63 inserted into the insertion port 22 is locked to the locking body 34 of the elastic member 30, the locking member 63 can be displaced up and down by vibration, and thus the amplitude of the vibration transmitted to the locking member 63 becomes large. Therefore, it is conjectured that the force applying portion 33 of the elastic member 30 that applies force to the locking member 63 is elastically deformed up and down by vibration, and thus the vibration energy of the locking member 63 is absorbed by the elastic member 30, and thus resonance of the electromagnetic noise countermeasure member becomes small.

[0088] Further, it is presumed that since the natural vibration frequency of the elastic member 30 is smaller than that of the metal-made locking member 63, the vibration energy of the locking member 63 is absorbed by the elastic member 30, and thus the resonance of the electromagnetic noise countermeasure member is reduced.

[0089] On the other hand, in the electromagnetic noise countermeasure member in which (H / D)% is negative, when the locking member 63 inserted into the insertion port 22 is locked to the locking body 34 of the elastic member 30, the locking member 63 is in a state of being in close contact with the upper guide and the lower guide. Therefore, it is presumed that since the locking member 63 cannot be displaced up and down, the urging portion 33 of the elastic member 30 also cannot be elastically deformed, and the elastic member 30 cannot absorb the vibration energy of the locking member 63, and thus the resonance of the electromagnetic noise countermeasure member is increased.

[0090] [Effects of Embodiments]

[0091] (1) According to the electromagnetic noise countermeasure member 1 of the above-described embodiment, the locking member 63 of the mounting member 60 is locked by the elastic member 30, and the elastic member 30 is elastically deformed by the vibration of the locking member 63, and thus the vibration energy of the locking member 63 is absorbed by the elastic member 30, and thus the resonance of the electromagnetic noise countermeasure member 1 is reduced.

[0092] Further, since the natural vibration frequency of the elastic member 30 is smaller than that of the metal-made locking member 63, the vibration energy of the locking member 63 is absorbed by the elastic member 30, and thus the resonance of the electromagnetic noise countermeasure member 1 is reduced.

[0093] (2) Moreover, according to the electromagnetic noise countermeasure member 1 of the above-described embodiment, the locking member 63 inserted into the insertion port 22 and locked to the locking hole 65 of the locking body 34 is in a state of being urged by the elastic member 30, and thus the elastic member 30 is elastically deformed by the vibration of the locking member 63, and thus the vibration energy of the locking member 63 is absorbed, and thus the resonance of the electromagnetic noise countermeasure member 1 is reduced.

[0094] Further, when the locking member 63 of the mounting member 60 is inserted into the insertion port 22, the locking body 34 of the elastic member 30 is locked to the locking hole 65 of the locking member 63, and thus the locking member 63 can be prevented from being pulled out of the insertion port 22.

[0095] (3) Moreover, according to the electromagnetic noise countermeasure member 1 of the above-described embodiment, the locking member 63 inserted into the insertion port 22 can maintain the state in which the locking body 34 of the elastic member 30 is locked to the locking hole 65 even if the locking member 63 vibrates, and thus the locking member 63 can be prevented from being pulled out of the insertion port 22 due to the vibration.

[0096] (4) Moreover, according to the electromagnetic noise countermeasure member 1 of the above-described embodiment, the distance H between the guides is longer than the plate thickness D of the locking member 63, and thus the locking member 63 is able to displace between the respective tips of the upper guide and the lower guide.

[0097] Therefore, as the amplitude of vibration generated by the locking member 63 becomes larger, the elastic deformation amount of the elastic member 30 becomes larger in correspondence therewith, and the vibration energy absorbed becomes larger, and thus resonance of the electromagnetic noise countermeasure member 1 can be further reduced.

[0098] Furthermore, the locking member 63 can be inserted into the insertion opening 22 in a state in which the upper guide and the lower guide abut, and thus compared to a structure in which the upper guide and the lower guide are not protrusively formed, the contact resistance of the locking member 63 can be reduced, and thus the force required for insertion can be reduced.

[0099] [Other Embodiments]

[0100] (1) (H / D) % is +2.8% as one example, and if the state in which the locking member 63 is able to be locked to the elastic member 30 even if vibrating is maintained, then the positive value can be further increased.

[0101] (2) If the state in which the locking member 63 is able to be locked to the elastic member 30 even if vibrating is maintained, and the locking member 63 is able to displace up and down, and furthermore the state in which the elastic member 30 exerts force to the locking member 63 is maintained, then it can also be a structure in which one or both of the upper guide and the lower guide are not provided.

[0102] (3) It can also be a structure in which the elastic member 30 is provided to the lower wall 24 below the insertion opening 22, and the locking body 34 protrudes from the lower wall 24 toward the insertion opening 22.

[0103] (4) The elastic member 30 can also be formed of metal. Furthermore, the portion of the force exerting portion 33 that abuts against the locking member 63 can also be formed of rubber. Furthermore, the locking body 34 can also be formed of rubber.

[0104] (5) It can also be a structure in which the force exerting portion 33 having the locking body 34 is provided singularly, and a plate spring, a coil spring, rubber, or the like elastic member is provided between the force exerting portion 33 and the wall above it. In this case, a plurality of elastic members can also be provided in front and back.

[0105] (6) An elastic body such as a spring or rubber can also be interposed between the fixed portion 31 and the force exerting portion 33. It can also be a structure in which the rear wall 23a extends to the vicinity of the front end of the force exerting portion 33, and an elastic body such as a spring or rubber is interposed between the rear wall 23a and the force exerting portion 33.

[0106] The invention is not limited to the above-described embodiments, and various modifications / changes can be made within the scope of the gist of the invention.

[0107] This application claims priority based on Japanese Patent Application No. 2020-061774 filed on March 31, 2020, the contents of which are incorporated herein by reference in its entirety.

[0108] BRIEF DESCRIPTION OF DRAWINGS

[0109] 1 electromagnetic noise countermeasure member

[0110] 10 first holding member

[0111] 20 locking structure portion

[0112] 21 housing

[0113] 22 insertion opening

[0114] 23 upper wall

[0115] 24 lower wall

[0116] 25 first upper guide

[0117] 26 second upper guide

[0118] 27 first lower guide

[0119] 27a first lower guide protrusion portion

[0120] 28 second lower guide

[0121] 28a second lower guide protrusion portion

[0122] 30 elastic member

[0123] 33 urging portion

[0124] 34 locking body

[0125] 40 first magnetic core member

[0126] 41 second magnetic core member

[0127] 50 second holding member

[0128] 60 mounting member

[0129] 61 fixing member

[0130] 63 locking member

[0131] 65 locking hole

Claims

1. An electromagnetic noise countermeasure member which is installed at a prescribed portion by an installation member, is caught by a catching member constituting the installation member, characterized in that, The electromagnetic noise countermeasure member is provided with: a magnetic core for surrounding a periphery of an electric wire; and a holding member for holding the magnetic core to an inner surface of itself, the locking member is formed in a plate shape of a metal, and a stepped portion is formed at both end portions thereof, an insertion opening for inserting the locking member is formed in the holding member, and an elastic member is installed, the elastic member locking the locking member inserted into the insertion opening and elastically deforming by vibration of the locking member, the insertion opening is formed by a first wall and a second wall which are opposed to each other, and a third wall and a fourth wall which are opposed to each other, the third wall and the fourth wall intersecting the first wall and the second wall, a first protruding portion capable of abutting against a first surface of the locking member inserted into the insertion opening is formed protruding from the first wall toward the insertion opening, a second protruding portion capable of abutting against a second surface of the locking member inserted into the insertion opening which is opposite to the first surface is formed protruding from the second wall toward the insertion opening, a distance between tips of the first protruding portion and the second protruding portion is longer than a plate thickness of the locking member, the third wall and the fourth wall each lock the stepped portion of the locking member inserted into the insertion opening in a manner that the locking member is vertically displaced.

2. The electromagnetic noise countermeasure member according to claim 1, wherein a locking hole is formed in the locking member, a locking body is provided in the elastic member, the locking body being locked to the locking hole of the locking member inserted into the insertion opening, the locking member inserted into the insertion opening and the locking body being locked to the locking hole is in a state of being forced by the elastic member.

3. The electromagnetic noise countermeasure member according to claim 2, wherein the locking member inserted into the insertion opening maintains a state that the locking body is locked to the locking hole and is capable of vibrating.

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