JP2014116172A - Coil bobbin and electromagnetic relay having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil bobbin 80 capable of achieving further down-sizing, and an electromagnetic relay comprising the coil bobbin 80.SOLUTION: A coil bobbin 80 comprises: coil terminals 91,92,93 and 94 comprising tuck-up portions 91a,92a,93a and 94a of a winding of a coil; and a body 80a where the tuck-up portions 91a,92a,93a and 94a are arranged in a zigzag in a direction of the winding of the coil.

Description

  The present invention relates to a coil bobbin and an electromagnetic relay including the same.

  Conventionally, a structure in which four external connection terminals are mounted on a coil bobbin is known as a terminal structure of a wire relay (for example, see Patent Document 1). In the prior art described in Patent Document 1, external connection terminals are penetrated in the vertical direction of the coil bobbin by insert molding technology at four predetermined positions of the coil bobbin.

JP-A-3-254035

  However, according to the prior art described in Patent Document 1, the coil bobbin becomes larger each time the number of external connection terminals increases, so that there is a problem that the assembly parts become larger.

  FIG. 7 is a diagram for explaining a conventional problem. Here, a case where two layers of coils are wound around the coil bobbin 80 is illustrated. Four coil terminals 91, 92, 93, and 94 are inserted into the body 80a of the coil bobbin 80 at a predetermined interval, and the tip ends thereof are bent in a direction perpendicular to the coil winding direction and project from the body 80a. According to this conventional example, each time the number of coil terminals 91, 92, 93, 94 increases, the width W1 of the coil bobbin 80 increases, so that there is a problem that the assembly parts are increased in size.

  Accordingly, an object of the present invention is to obtain a coil bobbin that can be reduced in size and an electromagnetic relay including the same.

  The present invention is a coil bobbin comprising at least two coil terminals having a coiled curled portion, and a body in which the curled portions are arranged in a staggered manner in the coil winding direction. Features.

  In the present invention, the curled portion may protrude from the body in a direction perpendicular to the winding direction.

  In the present invention, the odd-numbered curled portions may be arranged on the same line in the winding direction.

  Moreover, in this invention, the said even-numbered said curl part may be arranged in the other same line of the said winding direction.

  In the present invention, the body may include a rib that prevents the coil terminal from rotating around the curled portion.

  The present invention is an electromagnetic relay comprising any one of the coil bobbins described above.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide a coil bobbin which can achieve size reduction and an electromagnetic relay provided with the same.

FIG. 1 is a front view in which the cover of the electromagnetic relay according to the first embodiment of the present invention is omitted. FIG. 2 is a front view showing an open state of the electromagnetic relay shown in FIG. FIG. 3 is a perspective view of the coil bobbin according to the first embodiment of the present invention. FIG. 4 is a top view of the coil bobbin shown in FIG. FIG. 5 is a partially enlarged view of the coil bobbin according to the first embodiment of the present invention. FIG. 6 is a partially enlarged view of a coil bobbin according to the second embodiment of the present invention. FIG. 7 is a diagram for explaining a conventional problem.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that similar components are included in the following embodiments. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

[First Embodiment]
The first embodiment of the present invention will be described below.

(Configuration of electromagnetic relay)
FIG. 1 is a front view in which the cover of the electromagnetic relay according to the first embodiment of the present invention is omitted. In this electromagnetic relay, the armature 2 connected to the movable contact 51 is rotationally driven by the magnetic force of the electromagnet 1 to bring the movable contact 51 into and out of contact with the fixed contact 52. Specifically, as shown in FIG. 1, an electromagnet 1, an armature 2 that is rotationally driven by the magnetic force of the electromagnet 1, and a housing 3 in which the electromagnet 1 and the armature 2 are housed and the electromagnet 1 is fixed are provided. . Hereinafter, the top, bottom, left, and right are based on FIG. 1, and the front side of FIG. 1 is called the front side. However, this direction is defined for convenience of explanation only, and does not necessarily match the direction in the actual use state.

  The housing 3 includes a body 31 having a housing recess 30 opened on the front surface and a cover (not shown) that is coupled to the front side of the body 31 and closes the housing recess 30. A support 4 that supports the armature 2 so as to be rotatable with respect to the housing 3 is fixed to the housing 3.

  The support 4 has a flat shape with the thickness direction directed in the front-rear direction, and the left and right ends are fixed to the body 31, respectively, and the support 4 protrudes forward from the center of the front surface of the fixed portion 41. And a cylindrical shaft portion 42 having the axial direction in the front-rear direction. As means for fixing the fixing portion 41 to the body 31, for example, well-known means such as fitting can be used. In the armature 2, a bearing hole 20 having a circular cross-section and having an inner diameter slightly larger than the outer diameter of the shaft portion 42 is provided through the front and rear. By inserting the shaft portion 42 into the bearing hole 20, the armature 2 is supported so as to be rotatable around the central axis of the shaft portion 42 with respect to the housing 3.

  The electromagnet 1 has a coil (not shown) fixed to the body 31 on the rear side of the fixing portion 41 with the axial direction facing the vertical direction, and a magnetic pole piece 11 made of a magnetic material and magnetized by the coil. The coil is wound around a coil bobbin (described later) made of an insulating material such as resin. The pole piece 11 has a main body portion (not shown) penetrating the coil up and down, and variable magnetic pole portions 11a projecting forward from both upper and lower end portions of the main body portion, and has a U-shape as a whole. ing. That is, each variable magnetic pole part 11a is excited to a polarity corresponding to the direction of energization of the coil, and the polarity differs between the variable magnetic pole parts 11a. The housing 3 holds a plurality (three in FIG. 1) of coil terminals 60 having one end electrically connected to the coil and the other end protruding to the left of the housing 3. Energize the coil. The electromagnetic relay shown in FIG. 1 is a so-called two-winding latching type, and the coil has a tap. One coil terminal 60 is electrically connected to each end of the coil and the tap.

  The armature 2 has one set of fixed magnetic pole portions 21a sandwiching the variable magnetic pole portion 11a from the left and right at both upper and lower ends. In each set of fixed magnetic pole portions 21a, the left fixed magnetic pole portion 21a and the right fixed magnetic pole portion 21a of the variable magnetic pole portion 11a are magnetized to have different polarities. Specifically, the armature 2 includes two permanent magnets 22 having N poles oriented in a common direction in the left-right direction and two armatures 21 made of a magnetic material inserted into the synthetic resin molded body 23. It has been molded. Each armature 21 has a flat rectangular parallelepiped shape, and one surface in the thickness direction is magnetically attached to one pole of each permanent magnet 22. That is, the upper and lower end portions of the armatures 21 that protrude above and below the permanent magnet 22 are the fixed magnetic pole portions 21a. When the coil of the electromagnet 1 is energized, one of the left and right fixed magnetic pole portions 21a of the variable magnetic pole portion 11a is attracted to the variable magnetic pole portion 11a on the side corresponding to the energization direction. Thereby, the armature 2 rotates with respect to the housing 3 in the direction according to the energization direction to the coil. Once the coil is energized, the position of the armature 2 (and the position of the movable contact 51 and the like linked thereto) is maintained (latching) by the magnetic force of the permanent magnet 22 until a current in the reverse direction is passed through the coil. )

  The housing 3 accommodates a movable contact 51 that is interlocked with the rotation of the armature 2 as described above, and a fixed contact 52 that is separated from the movable contact 51. The movable contact 51 and the fixed contact 52 are electrically connected to the terminal plates 61 and 62, respectively. That is, the electrical connection between the terminal boards 61 and 62 is turned on and off as the movable contact 51 and the fixed contact 52 are separated from each other. Each of the terminal plates 61 and 62 is made of a metal plate whose thickness direction is in the left-right direction, and is fixed to the housing 3 so that the upper end portion protrudes outside the housing 3. The movable contact 51 is electrically and mechanically connected to the terminal board 61 via the contact holder 7. The contact holding body 7 is formed by stacking a plurality of contact holding springs 71 made of plate springs that are vertically long as a whole in the thickness direction and joined to each other at an upper end portion and a lower end portion. The lower end portion of the contact holder 7 is fixed to the right surface of the terminal board 61, and the upper end portion of the contact holder 7 can be elastically deformed so as to be displaced left and right with respect to the lower end portion. The movable contact 51 is fixed to the upper end portion of the contact holder 7 so that it can be elastically displaced left and right relative to the housing 3 on the left side of the fixed contact 52.

  The armature 2 and the movable contact 51 are interlocked by a card 8 connected to the contact holder 7 and the armature 2. The card 8 as a whole has a flat shape with the thickness direction directed in the vertical direction, and is guided by the inner surface of the housing 3 so as to be parallel to the housing 3 so as to be movable in the lateral direction. The terminal board 61 connected to the movable contact 51 is shaped to avoid the path of the card 8 so as not to hinder the displacement of the card 8. The armature 2 and the card 8 are connected to each other by inserting an S-shaped connecting piece 24 connected to the armature 21 into the armature recess 81 of the card 8. Further, the connection between the contact holder 7 and the card 8 is achieved by inserting the upper end portion of the contact holder 7 into a contact holder recess (not shown) opened in the vertical direction and rearward of the card 8. Has been. A card ball contact portion 72 that is inclined so as to be separated from the other contact holding springs 71 and elastically contacts the rightward inner surface of the contact holding member recess is provided at the upper end portion of the left end contact holding spring 71.

  As shown in FIG. 1, when the armature 2 rotates clockwise to the limit of the movable range and the movable contact 51 contacts the fixed contact 52 (hereinafter referred to as “closed state”), the card ball contact portion 72. Due to this elastic deformation, contact pressure is generated between the movable contact 51 and the fixed contact 52. As shown in FIG. 2, when the armature 2 rotates counterclockwise to the limit of the movable range and the movable contact 51 is separated from the fixed contact 52 (hereinafter referred to as “open state”), the contact is maintained. The body 7 as a whole is elastically deformed so as to displace the upper end portion to the left relative to the lower end portion, and the spring force is directed to bring the movable contact 51 closer to the fixed contact 52. That is, as the amount of elastic deformation increases, the minimum value of current to be input to the coil of the electromagnet 1 for the transition to the closed state (hereinafter referred to as “minimum on-current”) decreases.

(Configuration of coil bobbin)
FIG. 3 is a perspective view of the coil bobbin 80 according to the first embodiment of the present invention. Here, a case where two layers of coils (not shown) are wound around the coil bobbin 80 is illustrated. Specifically, the lead wire on one side of the coil of the first layer is tangled to the curled portion 91a of the coil terminal 91, and the lead wire on the other side of the coil of the first layer is tangled to the curled portion 92a of the coil terminal 92. ing. Similarly, the lead wire on one side of the second-layer coil is tangled to the curled portion 93a of the coil terminal 93, and the lead wire on the other side of the second-layer coil is tangled to the curled portion 94a of the coil terminal 94. ing. When the coil is energized through the coil terminals 91, 92, 93, 94, magnetic flux is generated to switch the open / close states of the plurality of contacts of the electromagnetic relay.

  Here, as shown in FIG. 3, the curled portions 91a, 92a, 93a, 94a are arranged in a staggered manner in the coil winding direction. That is, adjacent parts of the curled portions 91a, 92a, 93a, 94a are alternately arranged in the coil winding direction. The distance between adjacent curled portions can be changed as appropriate. As is apparent from this figure, the width W2 of the coil bobbin 80 is smaller than the conventional example (width W1) shown in FIG. Even if the number of the coil terminals 91, 92, 93, 94 increases, the width W2 of the coil bobbin 80 is constant, so that the coil bobbin 80 can be downsized.

  FIG. 4 is a top view of the coil bobbin 80 shown in FIG. Here, in order to distinguish the individual curled portions 91a, 92a, 93a, and 94a, they are referred to as the n (1, 2, 3, 4,...) Th curled portion in order from the synthetic resin molded body 23. To do. In this case, it is desirable that the odd-numbered folds 91a and 93a are arranged on the same line L1 in the coil winding direction. In this way, the coil terminals 91 and 93 can be shared. Moreover, it is desirable that the even-numbered folds 92a and 94a are arranged in the same other line L2 in the coil winding direction. In this way, the coil terminals 92 and 94 can be shared. Note that the distance between the lines L1 and L2 can be changed as appropriate.

  As described above, in the present embodiment, the curled portions 91a, 92a, 93a, 94a of the coil terminals 91, 92, 93, 94 are arranged in a staggered manner in the coil winding direction. In this way, even if the number of coil terminals 91, 92, 93, 94 increases, the width W2 of the coil bobbin 80 is constant, so the coil bobbin 80 can be downsized.

  Specifically, the curled portions 91a, 92a, 93a, 94a of the coil terminals 91, 92, 93, 94 protrude from the body 80a in a direction perpendicular to the coil winding direction. The coil bobbin 80 according to the present embodiment is particularly effective when applied to such a configuration.

  Further, in the present embodiment, odd-numbered bent parts 91a and 93a are arranged on the same line L1 in the coil winding direction. In this way, the coil terminals 91 and 93 can be shared. There is also an effect that assembly becomes easy.

  In the present embodiment, the even-numbered bent portions 92a and 94a are arranged in the same line L2 in the coil winding direction. In this way, the coil terminals 92 and 94 can be shared. There is also an effect that assembly becomes easy.

[Second Embodiment]
By the way, as shown in FIG. 5, the force F1 may be applied to the coil terminals 91, 92, and 93, for example, in the coil winding direction. In such a case, the coil terminals 91, 92, and 93 may be rotated by the force F1. Therefore, in the present embodiment, the following configuration is adopted in order to prevent a problem that the coil terminals 91, 92, 93 rotate.

  FIG. 6 is a partially enlarged view of a coil bobbin 80 according to the second embodiment of the present invention. Here, the part in which the coil terminals 91, 92, 93 are arranged in the body 80a of the coil bobbin 80 is enlarged. Although the coil terminal 94 is not illustrated, it is needless to say that the coil terminal 94 may be provided.

  As shown in this figure, the body 80a of the coil bobbin 80 includes ribs 82 to 87 that prevent the coil terminals 91, 92, and 93 from rotating around the bent portions 91a, 92a, and 93a. Specifically, the lower part of the curled portion 91a (the side opposite to the tip of the coil terminal 91) is sandwiched between the ribs 82 and 83 from both sides. The same applies to the other coil terminals 92 and 93. In this way, since the coil terminals 91, 92, 93 are fixed by the ribs 82 to 87, even when the force F1 is applied to the coil terminals 91, 92, 93, the coil terminals 91, 92, 93 rotate. Problems can be prevented. Of course, the ribs 82 to 87 are not limited to the type sandwiched from both sides as long as the rotation of the coil terminals 91, 92, and 93 can be prevented.

  As described above, in the present embodiment, the ribs 82 to 87 that prevent the rotation of the coil terminals 91, 92, and 93 are provided around the bent portions 91 a, 92 a, and 93 a. In this way, since the coil terminals 91, 92, 93 are fixed by the ribs 82 to 87, even when the force F1 is applied to the coil terminals 91, 92, 93, the coil terminals 91, 92, 93 rotate. Problems can be prevented.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, in FIG. 3 and FIG. 4 and the like, the four coil terminals 91, 92, 93, and 94 have been described as an example, but the number of coil terminals may be at least two and is not particularly limited. Further, the coil bobbin 80, the coil terminals 91, 92, 93, 94, the curled portions 91a, 92a, 93a, 94a, the ribs 82 to 87, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate. Is possible.

80 Coil bobbin 80a Coil bobbin body 82 to 87 Rib 60, 91, 92, 93, 94 Coil terminal 91a, 92a, 93a, 94a Lage L1, L2 line

Claims (6)

A coil bobbin,
At least two coil terminals having tangles of coil windings;
A coil bobbin comprising: the body having a staggered arrangement in the coil winding direction.   The coil bobbin according to claim 1, wherein the curled portion protrudes from the body in a direction perpendicular to the winding direction.   3. The coil bobbin according to claim 1, wherein odd-numbered curled portions are arranged on the same line in the winding direction.   The coil bobbin according to any one of claims 1 to 3, wherein the even-numbered curled portions are arranged in another same line in the winding direction.   The coil bobbin according to any one of claims 1 to 4, wherein the body includes a rib that prevents rotation of the coil terminal around the curled portion.   An electromagnetic relay comprising the coil bobbin according to any one of claims 1 to 5.

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