JP2017174507A - Coil bobbin, coil device, and electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce loosening of a conductor winding.SOLUTION: A coil bobbin 1 comprises a first cylinder 11, a second cylinder 12, and a protrusion 15. The first cylinder 11 has a first outer peripheral surface 111 which is provided around the axis, and around which a conductor is wound. The second cylinder 12 has a second outer peripheral surface 121 which is provided around the axis so as to have an outer diameter greater than that of the first outer peripheral surface 111, and around which the conductor is wound. The second cylinder 12 is provided along the axial direction so as to be continuous with the first cylinder 11. The protrusion 15 protrudes from at least part of a boundary, on the second outer peripheral surface 121, between the first cylinder 11 and the second cylinder 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coil bobbin, a coil device, and an electromagnetic relay.

  Conventionally, various coil bobbins used for electromagnetic relays are known (see, for example, Patent Document 1).

  In the electromagnetic relay described in Patent Document 1, a coil is formed by winding a conducting wire around a cylindrical tube portion of a coil bobbin.

  The cylindrical portion of the coil bobbin described in Patent Document 1 includes a large-diameter portion that faces the bush in the circumferential direction, and a small-diameter portion that faces the movable iron core and the fixed core in the circumferential direction and has a smaller outer diameter than the large-diameter portion. It is configured. Since the bush is disposed in the space between the cap and the large-diameter portion of the coil bobbin, the dead space generated between the cap and the cylindrical portion of the coil bobbin disappears, and the cap and the cylindrical portion of the coil bobbin can be brought into close contact with each other. . As a result, the outer diameter of the cylindrical portion of the coil bobbin is reduced at the small diameter portion, and the space of the conducting wire can be increased to improve the magnetic efficiency of the electromagnet.

JP 2006-310249 A (see paragraph 0028 and FIG. 3)

  However, in the conventional coil bobbin described in Patent Document 1, since the bobbin terminal is provided on the flange portion on the large-diameter portion side, the outer diameter of the outer peripheral surface is reduced from the large diameter portion where the outer diameter of the outer peripheral surface is large to the small diameter. The lead wire begins to wind toward the part. In this case, there is a high possibility that the lead wire will be collapsed at the start of winding. For this reason, disconnection of the conducting wire, damage to the coating, or the like may occur, or the winding efficiency may decrease.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a coil bobbin, a coil device, and an electromagnetic relay that can reduce the occurrence of the collapse of a conductive wire.

  The coil bobbin which concerns on 1 aspect of this invention is provided with a 1st cylinder part, a 2nd cylinder part, and a protrusion part. The first cylindrical portion has a first outer peripheral surface that is provided around an axis and around which a conducting wire is wound. The second cylindrical portion has a second outer peripheral surface provided around the shaft so that the outer diameter is larger than that of the first outer peripheral surface and around which the conductive wire is wound. The second tube portion is provided continuously to the first tube portion along the axial direction. The protruding portion protrudes from at least a part of a boundary between the first cylindrical portion and the second cylindrical portion in the second outer peripheral surface.

  In this coil bobbin, it is preferable that the height of the protruding portion from the second outer peripheral surface is an integral multiple of the outer diameter of the conducting wire.

  In this coil bobbin, it is preferable that the tip of the protruding portion has a semicircular shape in cross section including the axial direction and the protruding direction of the protruding portion.

  In this coil bobbin, it is preferable that the second outer peripheral surface has at least one region where the protrusion is not provided at the boundary.

  In this coil bobbin, it is preferable that a plurality of the regions where the protrusions are not provided are provided.

  In this coil bobbin, the thickness of the protruding portion in the axial direction is preferably an integral multiple of the outer diameter of the conducting wire.

  The coil apparatus which concerns on 1 aspect of this invention is equipped with the said coil bobbin and the said conducting wire.

  An electromagnetic relay according to an aspect of the present invention includes the coil device and a contact device. The contact device contacts and separates the fixed contact and the movable contact by energizing the conducting wire.

  The coil bobbin which concerns on 1 aspect of this invention is provided with the protrusion part which protrudes from at least one part of the boundary of a 1st cylinder part and a 2nd cylinder part among 2nd outer peripheral surfaces. Thereby, even if it is a case where a conducting wire begins to be wound from the 2nd outer peripheral surface with a large outer diameter, generation | occurrence | production of winding collapse of a conducting wire can be reduced.

  A coil device and an electromagnetic relay according to one embodiment of the present invention include a coil bobbin provided with a protruding portion. Thereby, even if it is a case where a conducting wire begins to be wound from the 2nd outer peripheral surface side with a large outer diameter, generation | occurrence | production of winding collapse of a conducting wire can be reduced.

FIG. 1 is an external perspective view of a coil bobbin according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a main part B of the coil bobbin. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an external perspective view of a coil bobbin according to Embodiment 2 of the present invention. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is an external perspective view of the electromagnetic relay according to the third embodiment of the present invention. 7 is a cross-sectional view taken along the line DD of FIG. FIG. 8 is an exploded perspective view of the electromagnetic relay.

  Hereinafter, the details of the coil bobbin and the coil device according to the first and second embodiments and the electromagnetic relay according to the third embodiment will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the coil bobbin 1 according to the first embodiment includes a first cylinder portion 11, a second cylinder portion 12, a first flange portion 13, a second flange portion 14, and a protruding portion. (Rib) 15. The coil bobbin 1 is formed of an insulating material having electrical insulation properties such as resin. In the coil bobbin 1, a conducting wire is wound as a winding 2 (see FIG. 8) around the first cylindrical portion 11 and the second cylindrical portion 12 between the first flange portion 13 and the second flange portion 14. Yes. The coil bobbin 1 is used for an electromagnetic relay 4 as shown in FIG. 6, for example.

  The 1st cylinder part 11 has a cylinder shape. More specifically, the 1st cylinder part 11 has a substantially cylindrical shape. The first cylinder portion 11 has a first outer peripheral surface 111 provided around the axis. A conducting wire is wound around the first outer peripheral surface 111 as the winding 2 (see FIG. 8). The 1st cylinder part 11 has the 1st through-hole 112 along the axial direction. An iron core (a fixed iron core or a movable iron core) is inserted into the first through hole 112.

  The 2nd cylinder part 12 has a cylinder shape. More specifically, the second cylinder portion 12 has a substantially cylindrical shape. The second cylindrical portion 12 is provided continuously to the first cylindrical portion 11 along the axial direction of the first cylindrical portion 11 and the second cylindrical portion 12. The 2nd cylinder part 12 has the 2nd outer peripheral surface 121 provided around the axis. A conducting wire is wound around the second outer peripheral surface 121 as the winding 2. The 2nd cylinder part 12 has the 2nd through-hole 122 (refer FIG. 3) along the axial direction. An iron core (a fixed iron core or a movable iron core) is inserted into the second through hole 122.

  The outer diameter D2 of the second outer peripheral surface 121 in the second cylindrical portion 12 is larger than the outer diameter D1 of the first outer peripheral surface 111 in the first cylindrical portion 11. Further, the inner diameter of the second outer peripheral surface 121 in the second cylindrical portion 12 is larger than the inner diameter of the first outer peripheral surface 111 in the first cylindrical portion 11.

  The first flange 13 has a second end opposite to the first end (the lower end in FIG. 1) connected to the second cylinder 12 among both ends of the first cylinder 11 in the axial direction. 1 is provided at the upper end of FIG. The first flange 13 has a substantially rectangular plate shape when viewed from the axial direction. The first flange 13 has a recess 131 around the first through hole 112. The 1st collar part 13 is provided with the protrusion part 132 which protrudes in an axial direction. The protrusion 132 has a pair of grooves 133 formed along the axial direction. A pair of lead wires 32 passes through the pair of grooves 133.

  The second flange portion 14 has a second end (on the opposite side to the first end (the upper end in FIG. 1) connected to the first tube portion 11 of the both ends of the second tube portion 12 in the axial direction). 1 is provided at the lower end of FIG. The second collar portion 14 has a substantially rectangular plate shape when viewed from the axial direction.

  The protruding portion 15 protrudes from at least a part of the boundary between the first cylindrical portion 11 and the second cylindrical portion 12 in the second outer peripheral surface 121. More specifically, the projecting portion 15 projects from at least a part of the boundary of the second outer peripheral surface 121 in a second direction orthogonal to the first direction that is the axial direction. Note that the second direction is not limited to a direction orthogonal to the first direction. The second direction may be a direction that intersects at least the first direction.

  By the way, as shown in FIG. 2, the height H1 from the 2nd outer peripheral surface 121 of the protrusion part 15 is the same as the outer diameter of the conducting wire as the coil | winding 2 (1 times the outer diameter of a conducting wire). The height H1 is not limited to being the same as the outer diameter of the conducting wire. The height H1 is preferably an integer multiple of the outer diameter of the conducting wire. The height H1 may be twice the outer diameter of the conducting wire, for example.

  The tip of the protrusion 15 has a semicircular shape in cross section including the axial direction and the protrusion direction of the protrusion 15.

  Further, as shown in FIGS. 2 and 3, the second outer peripheral surface 121 has at least one region where the protruding portion 15 is not provided at the boundary between the first cylindrical portion 11 and the second cylindrical portion 12. It has as a notch 123. The notch 123 is formed to pass the conductor when the conductor as the winding 2 is moved from the second outer peripheral surface 121 to the first outer peripheral surface 111. The notch 123 is not an essential configuration. The boundary of the second outer peripheral surface 121 is not limited to having the notch 123. That is, the protrusion 15 may be provided on the entire circumference of the boundary.

  Further, as shown in FIG. 2, the thickness T1 of the protruding portion 15 in the axial direction of the second cylindrical portion 12 is the same as the outer diameter of the conducting wire as the winding 2 (one times the outer diameter of the conducting wire). Is preferred. In addition, thickness T1 is not limited to being the same as the outer diameter of conducting wire. The thickness T1 is preferably an integral multiple of the outer diameter of the conducting wire. The thickness T1 may be, for example, twice the outer diameter of the conducting wire.

  Next, the coil device 3 according to the present embodiment will be described.

  As shown in FIG. 1, the coil device 3 includes a coil bobbin 1, a winding 2 (see FIG. 8), a pair of bobbin terminals 31, and a pair of lead wires 32 (see FIG. 8).

  The pair of bobbin terminals 31 is provided on the second flange 14 of the coil bobbin 1. Each bobbin terminal 31 is formed of a conductive material such as copper. The pair of lead wires 32 are connected to the pair of bobbin terminals 31. The pair of lead wires 32 correspond to the pair of bobbin terminals 31 one to one. Each lead wire 32 is connected to the corresponding bobbin terminal 31 by solder or the like. In the coil device 3 according to the present embodiment, the pair of ends of the winding 2 are connected to the pair of bobbin terminals 31. A pair of end portions of the winding 2 are connected to a pair of lead wires 32 via a pair of bobbin terminals 31.

  Since the pair of bobbin terminals 31 are provided on the second flange portion 14 of the coil bobbin 1, the conducting wire as the winding 2 is wound from the second outer peripheral surface 121 of the second cylindrical portion 12 in the coil bobbin 1. start. Thereafter, the conductive wire moves from the second outer peripheral surface 121 to the first outer peripheral surface 111 and is wound around the first outer peripheral surface 111. Subsequently, the conductive wire is wound from the first outer peripheral surface 111 toward the second outer peripheral surface 121. Thereafter, the conductive wire is wound around the first outer peripheral surface 111 and the second outer peripheral surface 121 several times by reciprocating between the first outer peripheral surface 111 and the second outer peripheral surface 121.

  The coil bobbin 1 according to the present embodiment described above includes the protruding portion 15 protruding from at least a part of the boundary between the first cylindrical portion 11 and the second cylindrical portion 12 in the second outer peripheral surface 121. Thereby, even if it is a case where a conducting wire begins to be wound from the 2nd outer peripheral surface 121 with a large outer diameter, generation | occurrence | production of winding collapse of a conducting wire can be reduced.

  According to the coil bobbin 1 which concerns on this embodiment, a conducting wire can be wound uniformly by making height H1 of the protrusion part 15 into the integral multiple of the outer diameter of conducting wire (winding 2).

  According to the coil bobbin 1 which concerns on this embodiment, the cross-sectional shape of the front-end | tip of the protrusion part 15 is semicircle shape. Thereby, since the cross-sectional shape of the front-end | tip of the protrusion part 15 becomes substantially the same shape as a conducting wire, a conducting wire can be uniformly wound through the part in which the protrusion part 15 is provided.

  According to the coil bobbin 1 according to the present embodiment, the second outer peripheral surface 121 has a region where the protruding portion 15 is not provided. Thereby, the conducting wire can be transferred from the second outer peripheral surface 121 to the first outer peripheral surface 111 through the region where the protruding portion 15 is not provided.

  According to the coil bobbin 1 according to the present embodiment, the conductive wire can be tightly wound around the second outer peripheral surface 121 when the thickness of the protruding portion 15 is an integral multiple of the outer diameter of the conductive wire (winding 2).

  The coil device 3 according to this embodiment includes a coil bobbin 1 provided with a protrusion 15. Thereby, even if it is a case where a conducting wire begins to be wound from the 2nd outer peripheral surface 121 with a large outer diameter, generation | occurrence | production of winding collapse of a conducting wire can be reduced.

  The electromagnetic relay in which the coil bobbin 1 according to this embodiment is used may be a plunger type electromagnetic relay or an electromagnetic relay other than the plunger type electromagnetic relay. The electromagnetic relay may be, for example, a hinge type electromagnetic relay.

(Embodiment 2)
As shown in FIG. 4, the coil bobbin 1 according to the second embodiment is different from the coil bobbin 1 according to the first embodiment in that a plurality of regions where the protrusions 15 are not provided are provided. In addition, about the component similar to the coil bobbin 1 which concerns on Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the present embodiment, a plurality of (three in FIGS. 4 and 5) cutouts 123 are provided in the second outer peripheral surface 121 of the second cylindrical portion 12 as regions where the protruding portions 15 are not provided. . As shown in FIG. 5, the plurality of regions (notches 123) are provided at equal intervals (120 ° intervals in the example of FIG. 5) on the second outer peripheral surface 121 when viewed from the axial direction. . In addition, the area | region where the protrusion part 15 is not provided is not limited to three. There may be two regions where the protrusions 15 are not provided, or four or more regions. In addition, description is abbreviate | omitted about the function similar to the 2nd cylinder part 12 (refer FIG. 1) of Embodiment 1. FIG.

  According to the coil bobbin 1 which concerns on this embodiment demonstrated above, the area | region where the protrusion part 15 is not provided is provided with two or more. Thereby, a conducting wire can be moved to the 1st outer peripheral surface 111 from the 2nd outer peripheral surface 121 in a desired position. As the number of the above regions increases, workability can be improved.

  The electromagnetic relay in which the coil bobbin 1 according to this embodiment is used may be a plunger type electromagnetic relay or an electromagnetic relay other than the plunger type electromagnetic relay. The electromagnetic relay may be, for example, a hinge type electromagnetic relay.

(Embodiment 3)
As shown in FIGS. 6 to 8, the electromagnetic relay 4 according to the third embodiment includes a contact device 5, a driving device 6, and a hollow box type housing 7. The housing 7 accommodates the contact device 5 and the drive device 6. The electromagnetic relay 4 according to the present embodiment is used for an electric vehicle or the like.

  The contact device 5 contacts and separates the pair of fixed contacts 511 and the pair of movable contacts 521 by energizing the conducting wire (winding 2). The contact device 5 includes a pair of fixed terminals 51, a movable contact 52, a contact pressure spring 53, a movable shaft 55, a case 56, a connecting body 57, and an insulating member 58.

  Each of the pair of fixed terminals 51 is formed in a substantially cylindrical shape by a conductive material such as copper. A fixed contact 511 is provided at the lower end of each fixed terminal 51. Each fixed terminal 51 is provided by being inserted through the through hole 561 of the case 56, and is fixed in a state where the upper end protrudes from the upper surface of the case 56.

  The pair of fixed contacts 511 are formed integrally with the pair of fixed terminals 51. Each fixed contact 511 may be separate from the fixed terminal 51 and may be fixed to the lower end of the fixed terminal 51.

  The movable contact 52 contacts and separates from the pair of fixed contacts 511. The movable contact 52 is formed in a flat plate shape that is long in the left-right direction (left-right direction in FIG. 7) using a conductive material such as copper. The movable contact 52 has a pair of movable contacts 521 on the left and right ends of the upper surface. That is, the pair of movable contacts 521 are both end portions of the movable contact 52 in the left-right direction. The pair of movable contacts 521 are formed at positions facing the pair of fixed contacts 511 with a predetermined interval.

  The contact pressure spring 53 is formed of a coil spring, and is disposed between the movable contact 52 and a fixed iron core 61 (described later) with the expansion / contraction direction directed in the vertical direction (vertical direction in FIG. 7).

  The movable shaft 55 moves in the axial direction (vertical direction in FIG. 7) so that the movable contact 52 is in contact with and separated from the pair of fixed contacts 511. The movable shaft 55 is formed in a substantially round bar shape that is long in the vertical direction. A movable iron core 62 of the driving device 6 is connected to the lower end of the movable shaft 55. The movable shaft 55 is fixed to the movable iron core 62 in a state where the movable shaft 55 is inserted through the through hole 611 of the fixed iron core 61, the return spring 64 and the through hole 621 of the movable iron core 62.

  The case 56 is formed in a hollow box shape whose lower surface is opened from a heat resistant material such as ceramic. Two through holes 561 are formed on the upper surface of the case 56 so as to be aligned in the left-right direction.

  The connecting body 57 has a first end joined to the periphery of the opening of the case 56 by brazing. And the 2nd end of the connection body 57 is joined to the 1st yoke plate 631 among the yokes 63 of the drive device 6 by brazing.

  The insulating member 58 includes a bottom surface portion 581 and a protruding portion 582. The insulating member 58 is formed in an approximately hollow rectangular parallelepiped shape having an upper surface opened from an electrically insulating insulating material such as ceramic or synthetic resin, and the upper end side of the outer peripheral wall contacts the inner surface of the peripheral wall of the case 56. As a result, the insulating member 58 insulates the arc generated between the pair of fixed contacts 511 and the pair of movable contacts 521 from the joint between the case 56 and the coupling body 57 at the opening of the case 56.

  The contact block 41 is configured by the contact device 5, the fixed iron core 61, the movable iron core 62, the return spring 64, the cylindrical member 65, and the first yoke plate 631 of the yoke 63.

  Next, details of the driving device 6 will be described.

  The drive device 6 includes a coil device 3 (coil bobbin 1, winding 2), a fixed iron core 61, a movable iron core 62, a yoke 63, a return spring 64, a cylindrical member 65, and a bush 66. . The drive device 6 is an electromagnet device, and drives the movable shaft 55 so that the movable contact 52 (the pair of movable contacts 521) is in contact with and separated from the pair of fixed contacts 511.

  The fixed iron core 61 is formed in a substantially cylindrical shape by a magnetic material, and is disposed and fixed in the coil bobbin 1. More specifically, the fixed iron core 61 is provided in the cylindrical member 65.

  The movable iron core 62 is formed in a substantially cylindrical shape by a magnetic material, and is disposed in the coil bobbin 1 so as to face the fixed iron core 61 in the axial direction. More specifically, the movable iron core 62 is provided in the cylindrical member 65. The movable iron core 62 is fixed to the movable shaft 55 and moves up and down in response to energization of the winding 2. More specifically, when the winding 2 is energized, the movable iron core 62 moves upward. On the other hand, when the energization to the winding 2 is interrupted, the movable iron core 62 moves downward.

  The yoke 63 includes a first yoke plate 631, a second yoke plate 632, and a pair of third yoke plates 633. The first yoke plate 631 is formed in a substantially rectangular plate shape, and is provided on the upper end side of the coil bobbin 1. An insertion hole 634 is formed substantially at the center on the upper surface side of the first yoke plate 631. The upper end portion of the fixed iron core 61 is inserted through the insertion hole 634. The second yoke plate 632 is provided on the lower end side of the coil bobbin 1. The pair of third yoke plates 633 are provided to extend from the left and right ends of the second yoke plate 632 to the first yoke plate 631 side. That is, the second yoke plate 632 and the pair of third yoke plates 633 are integrally formed.

  The return spring 64 is inserted into the through hole 611 of the fixed iron core 61. The return spring 64 is provided in a compressed state between the insulating member 58 and the movable iron core 62, and elastically biases the movable iron core 62 downward.

  The cylindrical member 65 is formed in a bottomed cylindrical shape, and is accommodated in the first cylindrical portion 11 and the second cylindrical portion 12 of the coil bobbin 1. A flange 651 is formed at the upper end of the cylindrical member 65. The flange portion 651 is located between the first flange portion 13 of the coil bobbin 1 and the first yoke plate 631. Here, the movable iron core 62 is provided on the lower end side in the cylindrical portion 652 of the cylindrical member 65. Further, a fixed iron core 61 is provided in the cylindrical portion 652.

  The bush 66 is formed in a cylindrical shape from a magnetic material. The bush 66 is fitted into a gap formed between the inner peripheral surface on the lower end side (second cylindrical portion 11) of the coil bobbin 1 and the outer peripheral surface of the cylindrical member 65. The bush 66 forms a magnetic circuit together with the first to third yoke plates 631 to 633, the fixed iron core 61, and the movable iron core 62.

  Next, details of the housing 7 will be described.

  The housing 7 is formed in a substantially rectangular box shape by using a resin or the like, and includes a hollow box-type housing main body 71 having an open upper surface and a hollow box-type cover 72 covering the opening of the housing main body 71. Yes.

  As shown in FIG. 6, the housing body 71 is provided with a pair of protrusions 711 in which insertion holes 712 used for fixing the electromagnetic relay 4 to the mounting surface by screwing are formed at the front ends of the left and right side walls. Yes.

  The cover 72 is formed in a hollow box shape whose bottom surface is open. On the upper surface portion 721 of the cover 72, a partition portion 722 is formed that divides the upper surface portion 721 into left and right parts. A pair of insertion holes 723 into which the fixed terminals 51 are inserted are formed in the upper surface portion 721 divided into two by the partition portion 722.

  In addition, a cushion rubber 74 having an insertion hole 741 through which the fixed terminal 51 is inserted is interposed between the case 56 and the cover 72.

  In the electromagnetic relay 4 configured as described above, the movable iron core 62 slides downward due to the urging force of the return spring 64, and the movable shaft 55 also moves downward accordingly. Thereby, the movable contact 52 moves downward. Therefore, in the initial state, the pair of movable contacts 521 are separated from the pair of fixed contacts 511.

  When the winding 2 is energized and the movable iron core 62 is attracted by the fixed iron core 61 and slides upward, the movable shaft 55 connected to the movable iron core 62 also moves upward in conjunction with it. As a result, the movable contact 52 also moves upward. And a pair of movable contact 521 contact | abuts to a pair of fixed contact 511, and between the contacts is conducted.

  Further, when energization of the winding 2 is turned off, the movable iron core 62 slides downward by the urging force of the return spring 64, and the movable shaft 55 moves downward accordingly. Thereby, since the movable contact 52 also moves downward, the pair of fixed contacts 511 and the pair of movable contacts 521 are separated from each other.

  In addition, the electromagnetic relay 4 which concerns on this embodiment may be electromagnetic relays other than a plunger type electromagnetic relay. The electromagnetic relay 4 may be, for example, a hinge type electromagnetic relay.

  Further, in the contact device 5 of the electromagnetic relay 4 according to the present embodiment, the pair of movable contacts 521 are a part of the movable contact 52 and the base of the movable contact 52 (the pair of movable contacts among the movable contacts 52). And a portion excluding the contact point 521). However, as a modification of the present embodiment, the pair of movable contacts may be provided separately from the base of the movable contact 52. In the case of this modification, the pair of movable contacts are fixed to the base of the movable contact 52. Also in the contact device 5 according to this modification, a pair of movable contacts provided separately from the base of the movable contact 52 moves integrally with the base of the movable contact 52 by the movement of the movable shaft 55, The movable contact is brought into and out of contact with the pair of fixed contacts 511.

  The electromagnetic relay 4 according to this embodiment described above includes the coil bobbin 1 provided with the protruding portion 15. Thereby, even if it is a case where a conducting wire begins to be wound from the 2nd outer peripheral surface 121 with a large outer diameter, generation | occurrence | production of winding collapse of a conducting wire can be reduced.

DESCRIPTION OF SYMBOLS 1 Coil bobbin 11 1st cylinder part 111 1st outer peripheral surface 12 2nd cylinder part 121 2nd outer peripheral surface 123 Notch (area | region where the protrusion part is not provided)
15 Protruding part 2 Winding (conductor)
3 Coil Device 4 Electromagnetic Relay 5 Contact Device 511 Fixed Contact 521 Movable Contact H1 Height T1 Thickness

Claims (8)

A first cylindrical portion having a first outer peripheral surface provided around the axis and wound with a conducting wire;
The second outer peripheral surface is provided around the shaft so that the outer diameter is larger than that of the first outer peripheral surface, and the conductive wire is wound around the second outer peripheral surface. The second cylindrical surface extends along the axial direction. A second cylindrical portion provided;
A coil bobbin comprising: a protruding portion protruding from at least a part of a boundary between the first cylindrical portion and the second cylindrical portion in the second outer peripheral surface.   The coil bobbin according to claim 1, wherein a height of the protruding portion from the second outer peripheral surface is an integral multiple of an outer diameter of the conducting wire.   3. The coil bobbin according to claim 1, wherein the tip of the protruding portion has a semicircular shape in cross section including the axial direction and the protruding direction of the protruding portion.   The coil bobbin according to any one of claims 1 to 3, wherein the second outer peripheral surface has at least one region where the protrusion is not provided at the boundary.   The coil bobbin according to claim 4, wherein a plurality of the areas where the protrusions are not provided are provided.   The coil bobbin according to any one of claims 1 to 5, wherein a thickness of the protruding portion in the axial direction is an integral multiple of an outer diameter of the conducting wire. The coil bobbin according to any one of claims 1 to 6,
A coil device comprising: the conducting wire. A coil device according to claim 7;
An electromagnetic relay comprising: a contact device that contacts and separates the fixed contact and the movable contact by energizing the conducting wire.

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