JP2019186492A - Noise prevention resistor - Google Patents

Abstract

To provide an anti-noise resistor capable of preventing breakage during mounting while reducing a variation in outer diameters of cap terminals and securing electrical contact.SOLUTION: A noise prevention resistor 10 has a configuration in which, at both ends of a cylindrical resistor 2, cap terminals 3a, 3b having cylindrical shapes with openings 4a, 4b at both ends are mounted. By making the cap terminals 3a, 3b cylindrical, lengths of the cap terminals in an axial direction can be secured long and stable conduction can be secured between a side surface portion and an external connection terminal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a noise prevention resistor mounted on an ignition plug of an internal combustion engine such as an engine.

  An engine ignition device such as a gasoline engine vehicle is ignited by flowing a high-voltage current through an ignition plug (spark plug) to discharge the spark plug and sparking a compressed mixed gas of gasoline and air in a cylinder. Since this discharge requires a voltage of 10 kV or more, the gasoline engine vehicle includes an ignition coil that boosts the battery voltage.

  The ignition coil is connected to a primary coil and a secondary coil housed in an insulating case, a core (iron core) around which these coils are wound, a coil body made of an IC chip for controlling ignition, and a spark plug. And a spring (connecting terminal on the spark plug side), a cylindrical insulating case for housing the spring, and the like.

  In such an engine ignition device, in order to suppress high-frequency noise (noise) generated at the time of engine ignition, for example, a noise prevention resistor is disposed in a tower portion between the coil body portion and the spring, and the noise prevention resistor is interposed therebetween. The coil body and the spark plug are electrically connected.

  For example, in the internal combustion engine ignition device disclosed in Patent Document 1, one end of a noise prevention resistor housed in a high voltage tower is electrically connected to a high voltage connection terminal, and the other end is electrically connected to an ignition plug. In order to obtain a secure connection, it is connected to a spring biased toward the high voltage connection terminal.

  In the ignition device for an internal combustion engine of Patent Document 1, a plug boot is inserted into a plug hole of the engine, and an ignition plug is inserted at the tip of the plug boot. As a result, the noise preventing resistor is brought into surface contact with the high-voltage connection terminal by the elastic force of the reduced spring, and the high-voltage connection terminal and the spark plug are electrically connected via the spring.

  In the ignition device for an internal combustion engine for an automobile described in Patent Document 2, a holding clip for holding a resistor is accommodated in a cylindrical flange of a high voltage tower, and one end of the resistor is connected to a coil body. The other end of the coil spring is connected to one end of a coil spring on the spark plug side.

  In Patent Document 2, the resistor is mounted on the base until the first conductive terminal (cap terminal) reaches the other side of the taper portion while the resistor is aligned with the longitudinal axis of the holding clip. Discloses a technique for connecting to a retaining clip by pushing toward.

JP 2006-324515 A JP 2013-234651 A

  In the resistor mounting method in Patent Documents 1 and 2 described above, high voltage connection terminals or holding clips and springs are brought into contact with the bottom surfaces of the electrodes (cap terminals) of the noise prevention resistors to ensure conduction. . However, the cap terminal of the noise prevention resistor may be slightly distorted due to dimensional variation during molding or due to processing during mounting on the resistance element. In that case, there is a possibility that the contact with the high-voltage output terminal or the spring may become unstable, thereby causing a conduction failure.

  Furthermore, when the ignition coil is assembled, and inserted into the engine, the spring is compressed, so that a large compression load is applied to the noise prevention resistor inside the high-voltage tower. At that time, if the noise prevention resistor is not arranged linearly along the axial direction of the ignition coil due to distortion of the cap terminal or the like, the noise prevention resistor may be damaged or the cap terminal and the resistance element may be There is a problem that conduction becomes unstable by applying a load larger than the bonding strength.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to realize reliable conduction inside an ignition coil of an internal combustion engine or the like, and to make noise compatible with various mounting structures. It is to provide a prevention resistor.

  In order to achieve the above object, the present invention provides a noise prevention resistor comprising a pair of cap terminals attached to both ends of a columnar resistor, wherein at least one cap terminal of the pair of cap terminals has both ends. It is characterized by having a cylindrical shape with an opening.

  For example, one of the pair of cap terminals is the cylindrical cap terminal, and the other is a cap terminal having a bottomed cylindrical shape having a bottom surface, a side surface, and an opening. For example, the cylindrical cap terminal has an extended portion in which a part of the side surface protrudes outward in the circumferential direction, and a flat portion continuous with the extended portion. Further, for example, the cylindrical cap terminal has an extended portion in which the diameter of the cap terminal increases from the substantially axial central portion of the side surface toward the opening. Further, for example, the end of the resistor is inserted in a range of approximately one third to one third of the axial length of the cap terminal. For example, the resistor is a winding resistor formed by winding a resistance wire around the outer periphery of a core material formed by bundling fibrous insulators.

  According to the present invention, by improving the accuracy of the cap terminal diameter of the noise prevention resistor, the load applied to the resistor is reduced during mounting to prevent damage, and at the same time, the cap terminal, the high-voltage output terminal, and the spring It is possible to prevent poor conduction.

FIG. 1A is an external perspective view of a part of the noise prevention resistor according to the embodiment of the present invention, FIG. 1B is a sectional view of the resistor, and FIG. 1C is a cap. It is a connection detailed drawing of a terminal and a resistive element end. It is a figure which shows the noise prevention resistor which crimped the side part of the cap terminal. It is a figure which shows the noise prevention resistor which made the opening part of the cap terminal and the end surface of a resistance element the same plane. It is a figure which shows the example of a shape of the cap terminal in the noise prevention resistor which concerns on the example of this Embodiment. It is a figure which shows the example which provided the expansion part in the cap terminal in the noise prevention resistor which concerns on the example of this Embodiment. It is a figure which shows the example of the mounting structure in the engine ignition device of the noise prevention resistor which concerns on the example of this Embodiment. It is a figure which shows the other example of the mounting structure in the engine ignition device of the noise prevention resistor which concerns on the example of this embodiment. It is a figure which shows the mounting structure by the side of the spark plug in the engine ignition device of the noise prevention resistor which concerns on the example of this Embodiment. It is a flowchart which shows the manufacturing process of the noise prevention resistor which concerns on the example of this embodiment in time series. It is the external appearance perspective view and sectional drawing of the noise prevention resistor which concern on a modification.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A is an external perspective view showing a part of a noise prevention resistor (hereinafter also simply referred to as a resistor) according to the present embodiment. FIG.1 (b) is sectional drawing which cut | disconnected the resistor along the XX 'arrow sight line of Fig.1 (a).

  The resistor 10 according to the present embodiment is a resistance in which a resistance wire 7 is wound around an outer periphery of a rod-like (columnar) core material 5 formed by bundling fibers made of an insulator such as a glass insulator such as glass. An element (also referred to as a resistor) 2 and cap terminals 3 a and 3 b attached to both ends of the resistance element 2 and electrically connected to the end of the resistance wire 7 are provided.

  The resistor 10 is a noise prevention resistor that functions as a noise filter that is mounted on, for example, an engine ignition device and that effectively suppresses radiation noise such as ignition noise that is generated when the engine is ignited. Therefore, for example, a winding resistance element in which a resistance wire such as Ni-Cr is wound around a core material, a ceramic resistance element in which a powder of tin oxide, antimony oxide or the like is formed into a cylindrical shape, or a metal plating film such as electroless Ni A resistor having a cap terminal attached to a trimmed metal film resistor element or the like can be used.

  The resistance wire 7 wound around the outer periphery of the core material 5 is, for example, a metal wire such as a nickel / iron (Ni-Fe) wire, a nickel (Ni) wire, or a chromium (Cr) wire, depending on the resistance value of the resistor. To select. Here, the resistance wire 7 having a wire diameter of about several tens of μm (for example, 50 to 60 μm) is wound around the core material 5 at a narrow pitch. In addition, a metal wire may be used as it is as the resistance wire 7, or a coated conductor in which a resin coating is formed on the surface of the metal wire may be used.

  For the core material 5, for example, a core material formed by bundling a large number of fibers made of an insulator such as glass, ferrite, resin, or alumina is used. A glass fiber bundle is suitable from the viewpoint of cost and high heat resistance. The glass fiber bundle is a bundle obtained by combining a plurality of glass fibers, and one fiber diameter is several μm to several tens μm. Therefore, if it is conveyed in a long state before cutting, it will bend without maintaining the shape of the core material. For example, glass fiber is impregnated with epoxy resin, silicone resin, etc. and heated and cured to maintain the shape. .

  When the resistor is mounted on the engine ignition device, since the cap terminal is electrically connected to the ignition coil main body, it is necessary to have at least a cylindrical shape. Therefore, the cap terminals 3a and 3b of the resistor 10 according to the present embodiment include an opening 4c for mounting on the end of the resistance element 2 and an ignition coil main body as shown in FIG. It is formed in a cylindrical shape having drawn-out end portions and openings 4a and 4b that secure connection within the cap terminal.

  The cap terminals 3a and 3b are made of a conductive metal such as iron or stainless steel, for example, and the surfaces thereof are plated with copper or nickel, and have a cylindrical shape. From the viewpoint of stability of connection to an ignition coil main body or the like, which will be described later, and ease of processing, it is preferably a cylindrical shape, but the cross-sectional shape may be a square shape. The cap terminals 3a and 3b are manufactured by cutting such a metal long pipe to a predetermined length, or by cutting and bending such a metal plate material to a predetermined length.

  In the resistor 10 according to the present embodiment, the connection between the cap terminals 3a and 3b and the resistance element 2 is provided with a certain depth (contact area), thereby ensuring mutual connection. Specifically, as shown in FIG. 1B, the axial length A of the cap terminals 3a and 3b is the same as the dimension B of the portion where the cap terminals 3a and 3b are attached to the resistance element 2. Or it forms so that it may become longer than the dimension B (A> = B).

  By setting the cap terminals 3a and 3b to the above dimensions, the axial length dimension (A) can be secured longer than that of the conventional noise prevention resistor, and the side surfaces of the cap terminals and the external connection terminals are stable. Continuity can be secured. In addition, since the cap terminals 3a and 3b have a cylindrical shape having no bottom surface portion, as shown in FIG. 2, when the side surface portion of the cap terminal is caulked and fixed to the resistance element, the cap terminal is not deformed. A wide (uncaulked area) can be secured.

  That is, in the noise prevention resistor 20 shown in FIG. 2, the above-described caulking can secure the conduction between the cap terminals 3a and 3b and the resistance wire 7 and prevent the cap terminal from being pulled out. Deformation (distortion) due to caulking is less likely to occur in a portion (for example, the uncaulked regions S1 and S2) that is to be electrically connected to a connection terminal or the like.

  As a result, the resistor 20 shown in FIG. 2 has distortion due to caulking by ensuring the areas S1 and S2 that are not caulked even if the caulking traces 6 are present on the side surfaces of the cap terminals 3a and 3b. Since it becomes difficult, the dispersion | variation in the outer diameter dimension (D) of a cap terminal can be reduced. Therefore, the cap terminal can be brought into close contact with the inner wall (projection) of the high-voltage tower.

  In addition, depending on the mounting structure of the resistor on the ignition coil main body, a structure in which the resistor element is in contact with the entire length of the cap terminal in the axial direction may be used. For example, like the noise prevention resistor 30 shown in FIG. 3, the openings 4 c and 4 d of the cap terminals 3 c and 3 d and the end face of the resistance element 2 are the same with A = B in the resistor shown in FIG. You may make it become a plane.

  On the other hand, from the standpoint that there is an individual difference (dimensional tolerance) in the axial length dimension of the side surface portion of the cap terminal, in order to ensure a sufficient contact area between the side surface portion of the cap terminal and the external connection terminal, It is desirable that A> B. In particular, since the connection of the cap terminal on the inner wall is possible by the structure of the ignition coil, the attachment range (B) of the cap terminal to the resistance element is, for example, from one third of the length dimension (A) of the cap terminal. It is desirable to be about two thirds or about 50 to 60%.

  Next, the shape of the cap terminal of the noise prevention resistor according to the present embodiment will be described. FIG. 4 shows an example of a cap terminal having a cylindrical shape as a whole and an H-shaped cross section. A cap terminal 23a shown in FIG. 4A is provided on the inner wall side of the cylindrical cap terminal, and a partition wall 25 that blocks the cylindrical hollow portion is provided at a substantially central portion in the axial direction. Moreover, the cap terminal 33a shown in FIG.4 (b) is the example which provided the projection part 35 in the circumferential direction in the approximate center part of the axial direction of the inner wall side of a cap terminal.

  The cap terminal 23a shown in FIG. 4A can prevent the insertion depth of the cap terminal from varying because the partition 25 serves as a stopper when the end of the resistance element 2 is inserted into the opening 24c and the cap terminal is mounted. . Thereby, the axial length A of the cap terminal shown in FIG. 1B and the dimension B of the portion where the cap terminal is attached to the resistance element can be reliably defined.

  Similarly, the cap terminal 33a shown in FIG. 4B can prevent the protrusion 35 from serving as a stopper and variations in the insertion depth of the cap terminal into the resistance element.

  FIG. 5 shows an example in which the extended portion is provided on the cap terminal. Here, the extended portion is a portion in which a part of the cap terminal protrudes in the circumferential direction. The cap terminal 43a in FIG. 5 (a) is a shape in which a part of the side surface of the cap terminal on the opening 44c side is expanded so as to extend substantially linearly toward the opening 44c and gradually outward. The extended portion 55a. The tip of the extended portion 55a is a continuous flat portion.

  The cap terminal 43b shown in FIG. 5B has an extended portion 55b in which the substantially central portion in the axial direction of the side surface of the cap terminal protrudes outward in the circumferential direction. The circumferential top portion 57 of the extended portion 55b of the cap terminal 43b is at the same position as the end portion 42 of the resistance element 2 in the axial direction.

  The cap terminal 43c in FIG. 5C has an extended portion 55c whose side surface is curved outward in the circumferential direction from the substantially central portion in the axial direction toward the opening 54c. Further, the side surface of the cap terminal 43c toward the opening 54a also has a shape curved outward in the circumferential direction, like the extended portion 55c. Therefore, in the cap terminal 43c, the position where the side surface is most narrowed down in the circumferential direction (the position where the inner diameter is minimum) and the end 52 in the axial direction of the resistance element 2 are the same position. In addition, the front-end | tip part of the expansion part 55c is a continuous flat part.

  The cap terminal 43d shown in FIG. 5 (d) is the axial center of a portion that gradually extends outward substantially linearly toward the opening 44c on the side surface on the opening 44c side of the cap terminal 43a in FIG. 5 (a). The extended portion 55d is made thicker. The tip of the extended portion 55d is a continuous flat portion.

  The expansion portions 55a to 55d provided on the cap terminals shown in FIGS. 5A to 5D are filled in an insulating case that accommodates a booster coil or the like when a resistor is press fitted into the high pressure tower portion of the engine ignition device. Functions to prevent the resin from flowing into the high-pressure tower, functions as a spring stopper to electrically connect the high-voltage output terminal and the spark plug, positioning the resistor when press-fitted into the high-pressure tower, etc. Have

  The diameter of the extended portions 55a to 55d is the maximum diameter at the cap terminal, and may be, for example, the same as or slightly larger than the inner wall of the high-pressure tower portion. Note that not only the diameters of the extended portions 55a to 55d but also the positions and heights of the cap terminals can be arbitrarily changed depending on the structure of the high-voltage tower portion on which the noise prevention resistor is mounted. Furthermore, the length dimension of the side surface portion of the cap terminal can be arbitrarily changed depending on the structure of the high-voltage tower portion.

  Next, a mounting structure in the engine ignition device of the noise preventing resistor according to the present embodiment will be briefly described. FIG. 6 shows a simplified mounting structure in the case where there is no fixture such as a high-voltage output terminal for connecting the ignition coil main body and the noise prevention resistor. 6A shows a mounting structure when a resistor having a cap terminal having the shape shown in FIG. 1 is used, and FIG. 6B shows a resistor having a cap terminal having the shape shown in FIG. 4A. It is a mounting structure using a container.

  As described above, in the case of the resistor using the cap terminal having the extended portions 55a to 55d shown in FIG. 5, leakage of the resin resin filled in the case of the coil main body portion and the high voltage tower portion can be prevented. In the resistor mounting structure shown in FIG. 6, the resin to be filled enters the periphery of the resistors 10 and 40. At that time, conduction between the resistor arranged in the high voltage tower and the external connection terminal 61 electrically connected to the coil main body can be ensured by bringing the external connection terminal 61 into contact with the inner walls of the cap terminals 3a and 23a. .

  On the other hand, when there is a fixture such as a high voltage output terminal for connecting the ignition coil main body and the noise prevention resistor, as shown in FIG. 7A, the end of the cap terminal 3a (the edge 64 of the opening 4a). Is brought into contact with the high-voltage output terminal 63. Alternatively, as shown in FIG. 7B, electrical connection can be ensured by bringing the side surface portion 66 of the cap terminal 3a into contact with a fixture 65 such as a holding clip or a conductive cap.

  FIG. 8 shows a mounting structure (partial cross section) on the spark plug side in the engine ignition device of the noise prevention resistor according to the present embodiment. The opposite side of the noise prevention resistor from the coil body is electrically connected to the spark plug. For example, in the example shown in FIG. 8A, the side surface of the cap terminal 3a and the spring 71 come into contact with each other to ensure the connection with the spark plug. In the example shown in FIG. 8B, the connection with the spark plug is ensured by the conductive cap 75 in contact with the side surface of the cap terminal 3a.

  In FIGS. 8A and 8B, the connection with the spark plug can also be secured by bringing the end (edge) of the cap terminal 3a into contact with the spring 71, the conductive cap 75, and the like. In addition to the above, in the example shown in FIG. 8C, for example, conduction is ensured by bringing the upper portion of the spring 73 into contact with the inner wall 67 of the cap terminal 3a.

  In the noise prevention resistor according to the present embodiment, since the cap terminal has a cylindrical shape, there are few variations and distortions in the outer dimensions, so that it can be seen from the mounting structure shown in FIGS. In terms of securing electrical and mechanical contact with the member, the reliability is improved as compared with a resistor having a conventional structure. Moreover, said mounting structure can be arbitrarily combined according to the design of an ignition coil.

  Next, a manufacturing method of the noise prevention resistor according to the present embodiment will be described. FIG. 9 is a flowchart showing the manufacturing process of the noise prevention resistor according to the present embodiment in time series. In step S11 of FIG. 9, the core material of the resistor is formed. Here, for example, glass fibers having a fiber diameter of about several μm are bundled, impregnated with epoxy resin or silicone resin, and formed into a long rod shape to form a core material. In step S13, a resistance wire such as a nickel / iron (Ni—Fe) wire, a nickel (Ni) wire, a chromium (Cr) wire, or a nickel / chromium (Ni—Cr) wire is provided on the outer peripheral surface of the core material. Wind continuously at a pitch. The resistance value of the resistor is adjusted according to the type of wire and the winding pitch.

  In step S15, for example, an epoxy resin or a silicon resin is applied and coated on the outer peripheral surface of the core material wound and dried and cured by winding a resistance wire. Since the resin coating is intended to fix the resistance wire, the resin coat to be formed may be thick enough to hide the resistance wire. Thereafter, the coated resin coat is cured.

  In step S17, the resistance wire is wound as described above, and the long core material coated with the resin is cut into a predetermined dimension together with the resistance wire by a cutter or the like. In this way, individual pieces of winding resistance elements (resistors) are produced.

  In step S19, cap terminals are attached to both ends of the winding resistance element. For example, the end of the winding resistance element is mechanically pushed in the axial direction from the opening of the cap terminal and temporarily fixed, and then the portion of the side surface of the cap terminal that overlaps the end of the resistance element is By pressing and deforming (caulking), the resistance wire and the cap terminal are electrically connected.

  At this time, the winding resistance element is pushed down to approximately two-thirds to one-third of the length of the cap terminal. The resistance wire is cut at the same time when the glass fiber is cut into individual pieces, and the end thereof is accommodated in the cap terminal and fixed by caulking. Note that the cap terminal may be fitted (fitted) by being pressed into both ends of the winding resistance element.

  In step S21, at least the resistance wire and the opening of the cap terminal are covered by immersing the winding resistor manufactured in the above-described process in a tank filled with, for example, urethane resin, epoxy resin, or the like, and drying and curing. A protective film is formed. In addition, as a formation method of a protective film, you may apply | coat by a brush etc. or may spray. Moreover, you may form a protective film as needed. In step S23, inspections such as an appearance image inspection and resistance value measurement of the resistor manufactured through the above-described steps are performed.

  Note that the method for curing the resin or the like in the above step S15 or the like may be any of curing at room temperature, heat curing (for example, 100 to 200 ° C.), or curing by ultraviolet irradiation. From the viewpoint of shortening the drying time, the protective film resin formed on the entire outer surface of the resistor may be limited to a quick-drying urethane resin.

  As described above, the noise prevention resistor according to the present embodiment has a configuration in which a cap terminal having a cylindrical shape with both ends opened is attached to both ends of a substantially columnar resistor. By making the cap terminal cylindrical, it is possible to ensure a long length in the axial direction of the cap terminal, and it is possible to ensure stable conduction between the side surface portion and the external connection terminal. In addition, it is possible to cope with various mounting structures, such as inserting the external connection terminal from the opening of the cap terminal and bringing the tip of the external connection terminal into contact with the inner wall of the cap terminal to achieve conduction.

  Since the cap terminal is cylindrical, when the side surface of the cap terminal is caulked and fixed to the resistance element, a wide area not caulking can be secured, and deformation (distortion) due to caulking occurs in that area. This makes it difficult to reduce variations in the outer diameter of the cap terminal.

  Furthermore, when a pair of cylindrical cap terminals are attached to both ends of the resistor, it is possible to mount the resistor in either direction without being conscious of the ignition coil main body side and the spark plug side. This makes it possible to improve the workability when the resistor is attached.

  In addition, by providing an extension part on the cap terminal, even when a large compression load is applied to the noise prevention resistor inside the high-voltage tower by compressing the spring when assembling the ignition coil or inserting it into the engine, Most of the compressive load is applied to the expanded portion. For this reason, the expansion portion functions as a cushioning material during press-fitting and the like, and the load and impact force on the resistance element generated during press-fitting and the like are reduced as compared with the conventional one, and the resistance element is not easily damaged or poorly connected. .

  Furthermore, the presence of the expansion portion cancels individual differences that occur in the inner diameter of the cylindrical portion of the high-pressure tower portion, thereby avoiding poor connection. Moreover, it becomes stronger with respect to a compressive load by providing the extended part with the continuous flat part.

  The present invention is not limited to the embodiment described above, and various modifications are possible. Although the cylindrical cap terminals are attached to both ends of the noise prevention resistor 10 in the above-described embodiment, the present invention is not limited to this. For example, FIG. 10A is an external perspective view of a noise prevention resistor 90 according to a modification. FIG.10 (b) is sectional drawing which cut | disconnected the resistor 90 along the YY 'arrow line | wire of Fig.10 (a).

  In the resistor 90 shown in FIG. 10, a cylindrical cap terminal 91 is attached only at one end, and a (bottomed) cap terminal 93 having a bottom surface is attached at the other end. Thereby, the resistor simplified according to the mounting structure can be provided.

  Further, in the noise prevention resistor shown in FIG. 1, the axial length A and the cap terminals 3 a and 3 b are attached to the resistance element 2 in both the cap terminals 3 a and 3 b attached to both ends of the resistance element 2. Although it formed so that the dimension B of a part might become A> = B, it is not limited to this. For example, in each of the cap terminals 3a and 3b, the axial length A and the dimension B of the resistance element mounting portion may be different.

2 resistance elements (resistors)
3a-3d, 23a, 33a, 43c, 93 Cap terminals 4a-4d, 24a, 44c, 54a Opening 5 Core material 6 Caulking trace 7 Resistance wire 10, 20, 30, 40, 90 Noise prevention resistor 25 Bulkhead 35 Protrusion Parts 55a to 55d Expansion part 57 Circumferential top 61 External connection terminal 63 High voltage output terminal 65 Mounting tool 71, 73 Spring 75 Conductive cap S1, S2

Claims (6)

A noise prevention resistor comprising a pair of cap terminals on both ends of a columnar resistor,
At least one cap terminal of the pair of cap terminals has a cylindrical shape having openings at both ends, and the noise preventing resistor. 2. One of the pair of cap terminals is the cylindrical cap terminal, and the other is a cap terminal having a bottomed cylindrical shape having a bottom surface, a side surface, and an opening. Anti-noise resistor as described. 3. The noise prevention according to claim 1, wherein the cylindrical cap terminal includes an extended portion in which a part of a side surface projects outward in a circumferential direction, and a flat portion continuous with the extended portion. Resistor. 3. The noise prevention according to claim 1, wherein the cylindrical cap terminal has an extended portion in which a diameter of the cap terminal increases from a substantially axial center portion of a side surface toward the opening. Resistor. The end of the resistor is inserted in a range of approximately one-third to one-third of the axial length of the cap terminal. An anti-noise resistor as described in 1. 6. The resistor according to claim 1, wherein the resistor is a winding resistor formed by winding a resistance wire around an outer periphery of a core material formed by bundling fibrous insulators. An anti-noise resistor as described in 1.