Electromagnetic relay

Abstract

The present invention provides a sealed electromagnetic relay that does not have poor sealing. The electromagnetic relay (2) comprises: a housing (4); a cover (6); an adhesive member (38) disposed between a side portion (26) of the housing (4) and an inner surface (36a) of the cover (6) to fix the housing (4) and the cover (6); and a protrusion (34) formed on at least one of the side portion (26) and the inner surface (36a), wherein the adhesive member (38) fills a gap (40) between the side portion (26) and the inner surface (36a).

Description

Technical Field

[0001] The present invention relates to an electromagnetic relay, and in particular to a sealed electromagnetic relay whose interior is sealed by an adhesive component. Background Art

[0002] Electromagnetic relays that open and close contacts using electromagnets are widely known. Patent Document 1 discloses an electromagnetic relay in which an adhesive is applied to a gap between a housing that accommodates a component and a cover to seal the interior.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Utility Model Application Laid-Open No. 61-119237 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In a sealed electromagnetic relay, the box-shaped cover is a thin-walled molded part made of resin. The thin-walled cover sometimes warps, so the gap between the outer shell and the cover is uneven, and the gap between the outer shell and the cover may become smaller depending on the position.

[0008] When the gap between the housing and the cover becomes smaller, the adhesive cannot flow sufficiently into the gap, which may cause poor sealing of the electromagnetic relay.

[0009] Solutions for solving problems

[0010] The electromagnetic relay of the present invention comprises: a housing; a cover; an adhesive member interposed between the side of the housing and the inner surface of the cover to fix the housing and the cover; and a protrusion formed on at least one of the side and the inner surface, the adhesive member filling the gap between the side and the inner surface.

[0011] Effects of the Invention

[0012] According to the present invention, it is possible to provide a sealed electromagnetic relay in which sealing failure does not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view of the electromagnetic relay in the first embodiment.

[0014] Figure 2 It is an exploded perspective view of the electromagnetic relay in the first embodiment.

[0015] Figure 3 It is a perspective view of the electromagnetic relay with the cover removed in the first embodiment.

[0016] Figure 4It is a perspective view of the housing in the first embodiment.

[0017] Figure 5 It is a side view of the housing in the first embodiment.

[0018] Figure 6 It is a bottom view of the electromagnetic relay in the first embodiment.

[0019] Figure 7 It is an enlarged bottom view of the protrusion in the first embodiment.

[0020] Figure 8 It is an enlarged bottom view of a modification of the protrusion in the first embodiment.

[0021] Fig. 9 It is an enlarged bottom view of a modification of the protrusion in the first embodiment.

[0022] Fig.10 It is an enlarged perspective view of the protrusion in the first embodiment.

[0023] Fig.11 It is an enlarged perspective view of a modified example of the protrusion in the first embodiment.

[0024] Fig.12 It is an enlarged perspective view of a modified example of the protrusion in the first embodiment.

[0025] Fig.13 It is a bottom view of the electromagnetic relay in the second embodiment.

[0026] Fig.14 It is an enlarged bottom view of the electromagnetic relay in the second embodiment.

[0027] Fig.15 It is a perspective view of a housing including a first recessed portion in the second embodiment.

[0028] Fig.16 It is a perspective view of the housing showing a modified example of the first recessed portion in the second embodiment.

[0029] Fig.17 It is a perspective view of a housing showing a modified example including a first recessed portion and a second recessed portion in the second embodiment.

[0030] Description of Reference Numerals

[0031] 2, 42: electromagnetic relay; 4, 46: housing; 6, 44: cover; 26, 52: side; 34: protrusion; 38, 60: bonding member; 40, 58: gap; 36, 48: open end; 36a, 48a: inner surface; 56: first recess; 64: second recess. DETAILED DESCRIPTION

[0032] Hereinafter, an electromagnetic relay in an embodiment will be described with reference to the drawings. The electromagnetic relay in this embodiment includes a case and a cover, and an adhesive is applied to a gap between the case and the cover to seal the inside.

[0033] Figure 1 It is a perspective view of the electromagnetic relay 2 in the first embodiment. Figure 2 2 is an exploded perspective view of the electromagnetic relay 2. The electromagnetic relay 2 includes a case 4 in which components are assembled, and a box-shaped cover 6 surrounding the case 4. For example, the case 4 and the cover 6 are molded products containing resin.

[0034] The components assembled in the housing 4 include: a plurality of contact springs, an electromagnet, a hinge spring 8, an armature 10 and a buckle 12. The contact spring includes: a movable contact spring 14 having terminals 14a and 14b; a disconnecting fixed contact spring 16 having terminals 16a and 16b; and a closing fixed contact spring 18 having terminals 18a and 18b. The electromagnet includes: a coil assembly 20, a yoke 22 and an iron core 24. The coil assembly 20 includes: terminals 20a and 20b, a coil 20c and a coil frame 20d for winding the coil 20c.

[0035] The electromagnetic relay 2 excites the electromagnet by applying a voltage between the terminal 20a and the terminal 20b. The armature 10 is attracted to the iron core 24 by the excitation of the electromagnet. The buckle 12 is linked with the armature 10, and as the armature 10 is attracted to the iron core 24, the movable contact spring 14 is moved, so that the movable contact spring 14 contacts the closing fixed contact spring 18. In the state where the electromagnet is not excited, the movable contact spring 14 contacts the opening fixed contact spring 16. The hinge spring 8 is assembled to the armature 10 and the yoke 22, and elastically applies force to the armature 10 in the direction away from the iron core 24.

[0036] The electromagnetic relay 2 opens and closes the contacts by the above structure. The above structure is an example, and any components and principles can be adopted. For example, the contact spring on the disconnection side can also be omitted.

[0037] use Figure 3 , Figure 4 as well as Figure 5 The housing 4 will be described. Figure 3 This is a three-dimensional view of the electromagnetic relay with the cover removed. Figure 4 It is a perspective view of the housing 4 . Figure 5 It is a side view of the housing 4.

[0038] like Figure 4 As shown, the housing 4 includes: a pair of side portions 26 and 28, a bottom portion 30 and a top portion 32. The side portion 26 includes: surfaces 26a, 26b, 26c, a recess 26d and an opening 26e. Figure 5As shown, the base 30 includes a surface 30a and a protrusion 30b.

[0039] The side portion 26 has a protrusion 34 formed on a surface 26a formed at a position closest to the bottom 30. The protrusion 34 may be formed in any number. The side portion 26 may not include the recess 26d and the opening 26e. In addition, the side portion 26 may be formed as a single surface. It should be noted that the side portion 28 has the same structure as the side portion 26.

[0040] Next, the cover body 6 will be described. Figure 2 As shown, the cover 6 has a pair of side portions 6 a and 6 b , a pair of side portions 6 c and 6 d , and a top portion 6 e , and is open below the electromagnetic relay 2 as shown in the figure.

[0041] Figure 6 2 is a bottom view of the electromagnetic relay 2. The cover 6 has a rectangular outline, and its lower end is an open end 36. It should be noted that, Figure 6 In the embodiment, due to the occurrence of warping (described later), the outline of the cover body 6 is deformed from a rectangular shape to a shape including a curve. The cover body 6 also has an inner surface 36a. The inner surface 36a faces the surface 26a of the housing 4.

[0042] The cover body 6 is formed, for example, as a thin-walled resin member having a thickness of less than 1 mm. Figure 6 As shown, the warping occurs in such a manner that the portions near the center of each side near the opening end 36 bend inward after molding.

[0043] If the same raw materials and molding conditions are used for comparison, the degree of warping depends on the thickness and side length of the cover body 6. For example, the greater the thickness of the cover body 6, the lower the degree of warping. In addition, the shorter the side length of the cover body 6, the lower the degree of warping. Figure 6 In the embodiment, among the side portions 6a and 6b and the side portions 6c and 6d of the cover body 6, the warping of the side portions 6c and 6d having the shorter length is smaller.

[0044] Adhesive member 38 is disposed, for example, by coating, on the lower surface side of electromagnetic relay 2. Adhesive member 38 is made of, for example, an adhesive agent having epoxy resin as a main component, and contains a main agent and a curing agent.

[0045] Figure 6 In FIG. 3 , the shaded portion represents the bonding member 38. Figure 6 As shown, adhesive member 38 is applied to surface 30a of housing 4 and gap 40 between housing 4 and cover 6. When adhesive member 38 is formed by applying a liquid adhesive, the adhesive applied to surface 30a flows into gap 40 before curing.

[0046] The adhesive member 38 is not applied to the protrusion 30b of the housing 4. The protrusion 30b can ensure sufficient adhesive strength for the adhesive member 38 to fix the housing 4 and the cover 6 to each other, and can reduce the amount of adhesive member 38, thereby reducing the cost of the electromagnetic relay 2.

[0047] Figure 7 Is Figure 6 1 is an enlarged view of a region A surrounded by a dotted line. The region A shows the vicinity of the center of the warpage of the side portion 6 a of the cover body 6 in an enlarged manner.

[0048] The protrusion 34 is provided at a position opposite to the inner surface 36a near the center of the warping of the side portion 6a, and contacts the inner surface 36a through the top end. The protrusion 34 contacts the inner surface 36a, thereby pressing the central portion of the inner surface 36a that is bent inwardly outward. The protrusion 34 presses the inner surface 36a outward, thereby correcting the warping of the open end 36 at least partially, and ensuring the gap 40 in the entire open end 36.

[0049] The housing 4 has the protrusion 34, thereby ensuring the gap 40 throughout the opening end 36, so that a sufficient amount of the adhesive member 38 can be applied continuously between the surface 26a and the inner surface 36a of the housing 4. In addition, in the case where the adhesive member 38 includes an adhesive containing a main agent and a curing agent, by ensuring a continuous gap 40 throughout the opening end 36, the main agent and the curing agent can be prevented from separating (seeping out), and the adhesive can be properly cured. For example, it is preferred that the narrowest part of the gap 40 has a size of about 0.1 mm, and in this case, it is also preferred that the height of the protrusion 34 is also about 0.1 mm.

[0050] The protrusion 34 may be formed at any position on the side portion 26 of the housing 4 that contacts and presses the side portion 6a of the cover 6. For example, the protrusion 34 may be formed at any position on the surfaces 26a and 26c. In addition, when the side portion 26 is formed as a single surface, the protrusion 34 may be formed at any position on the surface.

[0051] The protrusion 34 may also be formed on the side portion 28 of the housing 4. In addition, the protrusion 34 may be formed at any position that contacts and presses the side portion 6c or 6d.

[0052] like Figure 8 As shown, the protrusion 34 may also be formed on the cover body 6. The protrusion 34 is formed on the inner surface 36a, contacts and presses the surface 26a facing thereto, and ensures a gap 40 in the entire opening end 36.

[0053] like Fig. 9As shown, the protrusions 34 may be formed on both the inner surface 36a and the surface 26a. For example, the protrusions 34 may be formed in an alternating arrangement on the cover body 6 side and the shell 4 side. By forming the protrusions 34 on both the shell 4 and the cover body 6, the contact area between the shell 4 and the cover body 6 and the adhesive member 38 is increased, so the adhesive strength between the adhesive member 38 and the shell 4 and the cover body 6 can be improved.

[0054] The protrusion 34 is formed into a cone shape, for example, Fig.10 Alternatively, it may be formed in a quadrangular column shape from the lower end to the upper end of the surface of the housing 4 or the cover 6. Fig.11 , as an example, a quadrangular column-shaped protrusion 34 having a trapezoidal bottom surface is shown from the lower end to the upper end of the surface 26a of the housing 4. When the housing 4 or the cover 6 is a resin part, it is easy to injection mold by forming it into a tapered shape.

[0055] In addition, the protrusion 34 may also be formed as follows Fig.12 The spherical segment shape shown. The spherical segment shape includes a hemispherical shape. By forming a shape without corners such as a spherical segment shape, the protrusion 34 is not easily cut when it contacts the housing 4 or the cover 6. Therefore, it is possible to suppress the chips generated by cutting from entering the housing 4.

[0056] use Figures 13 to 17 Next, the electromagnetic relay 42 in the second embodiment will be described. The same structure, function and effect as those of the electromagnetic relay 2 will not be described repeatedly.

[0057] Fig.13 4 is a bottom view of the electromagnetic relay 42. The electromagnetic relay 42 has a cover 44 and a housing 46. The cover 44 has side portions 44a and 44b, side portions 44c and 44d, and an inner surface 48a.

[0058] Fig.14 yes Fig.13 FIG. 4 is an enlarged view of a region B surrounded by a dotted line. The region B shows the vicinity of the center of the warpage of the side portion 44 a in an enlarged manner. Fig.15 FIG. 4 is a perspective view of the housing 46 in which the coil assembly 50 is assembled. Fig.15 As shown, housing 46 has sides 52 and 54. Side 52 has face 52a and face 52b.

[0059] A first recess 56 is formed on the surface 52a of the housing 46 near the center of the warping of the cover 44. One end of the first recess 56 opens toward the opening end 48. An arbitrary number of first recesses 56 are formed. Fig.15 The first recessed portion 56 shown in FIG. 5 is formed to be open at the lower end and the upper end of the surface 52 a of the housing 46 .

[0060] The side portion 52 may be formed as a single surface. In the case where the side portion 52 is formed as a single surface, the first recessed portion 56 may be formed to open at the lower end and the upper end of the side portion 52 .

[0061] Fig.16 It is a perspective view of the housing 46 showing a modified example of the first recessed portion 56 . Fig.16 The first recessed portion 56 shown in FIG. 5 is open at the lower end of the surface 52 a and is formed in a cubic shape.

[0062] The function and effect of the first recess 56 will be described. Fig.13 As shown, the width of the gap 58 between the cover body 44 and the housing 46 becomes smaller near the center of the warping of the cover body 44. However, the housing 46 has a first recess 56, and the adhesive member 60 can be applied to the first recess 56, thereby, a sufficient amount of the adhesive member 60 can be applied between the surface 52a and the inner surface 48a without interruption.

[0063] Furthermore, for example, when the adhesive member 60 is formed of an adhesive containing a main agent and a curing agent, the adhesive member 60 can be prevented from seeping out and the adhesive can be cured appropriately by flowing into the first recess 56 near the center of the warping of the cover 44 .

[0064] exist Fig.13 In the embodiment, the protrusion 62 is formed by the first recess 56. The contact area between the housing 46 and the adhesive member 60 can be increased by the protrusion 62, and the adhesive strength can be improved. It should be noted that the depth of the first recess 56 and the height of the protrusion 62 are assumed to be, for example, about 1 mm.

[0065] In addition, depending on the degree of warping of the cover body 44, the side portion 44a may come into contact with the protrusion 62. In this case, by supporting the side portion 44a in contact with the protrusion 62, the warping of the side portion 44a can be reduced.

[0066] Fig.17 It is a perspective view showing a modified example of the electromagnetic relay 42 . Fig.17 The housing 46 shown in FIG. 4 has not only the first recess 56 but also the second recess 64 . The first recess 56 and the second recess 64 are formed on the surface 52 a of the housing 46 and communicate with each other at one end of the first recess 56 .

[0067] The second recess 64 is formed at a position away from the opening end 48 of the cover body 44 relative to the first recess 56. The second recess 64 may be open at both ends of the surface 52a. Alternatively, the second recess 64 may be formed without opening at both ends of the surface 52a and only open at the cover body 44 side.

[0068] The first recess 56 and the second recess 64 are filled with the adhesive member 60. By filling not only the first recess 56 but also the second recess 64 with the adhesive member 60, the adhesive strength can be further improved.

[0069] It should be noted that the first recess 56 and the second recess 64 may be in any shape that can be filled with the adhesive member 60. For example, the first recess 56 and the second recess 64 may be formed in a tapered shape or in a curved shape.

[0070] The first recess 56 and the second recess 64 are filled with the adhesive member 60 and may be formed at any position of the housing 46 where the adhesive strength is to be increased. For example, the recess may be formed in the side portion 54 of the housing 46 .

[0071] The first recess 56 and the second recess 64 may also be formed in the cover body 44. When the recess is formed in the side portion 44a of the cover body 44, the first recess 56 is open on the side of the opening end 48, and the second recess 64 is connected to one end of the first recess 56 and is formed at a position away from the opening end 48 relative to the first recess 56.

[0072] Alternatively, the first recess 56 may be formed in the housing 46, and the second recess 64 may be formed in the cover 44. In this case, the first recess 56 and the second recess 64 are connected by contact between the cover 44 and the housing 46. When the cover 44 and the housing 46 are resin parts, the first recess 56 and the second recess 64 are provided in different parts, respectively, thereby facilitating respective injection molding.

[0073] The above-mentioned embodiments can be combined appropriately. In addition, in the above-mentioned respective figures, the same reference numerals are given to the same or corresponding parts. It should be noted that the above-mentioned embodiments are for illustration only and do not limit the invention.

Claims

1. An electromagnetic relay, comprising: case; Cover body; an adhesive member, interposed between the side of the shell and the inner surface of the cover body, fixing the shell and the cover body; and a protrusion formed on at least one of the side portion and the inner surface, wherein the protrusion forms a gap between the side portion and a central portion of the inner surface of the cover body where the warping occurs, The adhesive member fills a gap between the side portion and the inner surface.

2. An electromagnetic relay, comprising: case; Cover body; an adhesive member, interposed between the side of the shell and the inner surface of the cover body, fixing the shell and the cover body; and A first recessed portion is formed on either the side portion or the inner surface, one end of which is open toward the open end of the cover body, and the first recessed portion forms a gap between the side portion and a central portion of the inner surface of the cover body that has warped. The adhesive member fills a gap between the side portion and the inner surface.

3. The electromagnetic relay according to claim 2, comprising: A second recessed portion is formed at a position away from the opening end of either the side portion or the inner surface and communicates with the first recessed portion. The adhesive member is filled in the first recess and the second recess.

Images