Rocking armature assembly and electromagnetic relay

Abstract

A rocking armature assembly, comprising a first armature and a plastic part. The first armature comprises a fist end portion, a middle portion and a second end portion, and the plastic covers the middle portion of the first armature, the middle portion of the fisrt armature has a first surface and a second surface opposite each other, and a rough structure is provided on one of the surfaces, such that the contact area of the first armature and the plastic part is increased, thereby enhancing the adhesion between the first armature and the plastic part, the plastic pat is provided with a plastic swing extends through an end portion of the plastic part in a direction away from the middle portion of the first armature, and inclines in the thickness direction of the first armature.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] The present disclosure claims priority to Chinese Patent Application No. 202320370436.4 and 202320370388.9 filed on March 2, 2023, the disclosures of which are hereby incorporated by reference in their entirety.TECHNICAL FIELD

[0002] The present disclosure relates to the field of a relay, and particularly to a seesaw-type armature assembly and an electromagnetic relay.BACKGROUND

[0003] A relay is an electronic control device having a control system (also called an input circuit) and a controlled system (also called an output circuit). It is generally used in automatic-control circuits and essentially functions as an "automatic switch" that uses a small current to control a larger current. Thus, it performs functions such as automatic regulation, safety protection, and switching in a circuit.

[0004] An armature is an important component of an electromagnetic relay. Through cooperation between the armature and a magnetic-circuit portion of the electromagnetic relay, the armature can drive a moving spring of the contact portion of the electromagnetic relay, thereby achieving closure or separation of moving and static contacts.

[0005] In one armature assembly of an electromagnetic relay in the prior art, an armature, a plastic part and a plastic swing arm are included. By means of an injection-molding process, the plastic part encases a portion of the armature so that the plastic part and the armature form an integral assembly; the plastic swing arm is also formed during injection molding and constitutes part of the plastic part. However, because shrinkage rates of the iron piece (i.e., the armature) and the plastic part are not identical, bonding force between the two decreases after high-temperature baking, resulting in the armature and the plastic part not being able to be bonded into a single body.SUMMARY

[0006] An objective of the present disclosure is to overcome the deficiencies of the prior art and thus to provide a seesaw-type armature assembly and an electromagnetic relay. By adding a rough structure on a surface of the armature, the bonding force between the armature and the plastic part can be enhanced.

[0007] According to one aspect of the present disclosure, a seesaw-type armature assembly includes: a first armature, including a first end portion, a middle portion, and a second end portion in sequence along a length direction; a plastic part encasing the middle portion of the first armature; in which the middle portion of the first armature has a first surface and a second surface opposite to each other, and one of the first surface and the second surface is provided with a rough structure to increase a contact area between the first armature and the plastic part so as to enhance bonding force between the first armature and the plastic part; in which the plastic part is provided with at least one plastic swing arm, along the length direction of the first armature, the plastic swing arm extends to a direction away from the middle portion of the first armature from at least one of two ends of the plastic part, and is inclined to a thickness direction of the first armature.

[0008] In one embodiment, a portion of the plastic part in contact with the rough structure is a bonding portion, and the plastic swing arm is connected to the bonding portion.

[0009] In one embodiment, the rough structure is a mesh structure.

[0010] In one embodiment, the seesaw-type armature assembly includes two plastic swing arms disposed correspondingly at both ends of the plastic part.

[0011] In one embodiment, the middle portion of the first armature is further provided with at least one first through-hole penetrating its thickness, and the plastic part has a filling structure filling the first through-hole.

[0012] In one embodiment, a cross-section of the first through-hole is an inverted-T shape.

[0013] In one embodiment, the first end portion and / or the second end portion of the first armature is provided with an extension tab, and the extension tab extends and is bent to a direction away from the middle portion and embedded in a corresponding plastic swing arm to increase bonding strength between a root of the plastic swing arm and the first armature, so as to prevent the plastic swing arm being forced from detaching from the first armature.

[0014] In one embodiment, the extension tab of the first armature is embedded in the corresponding plastic swing arm when the plastic part is injection molded.

[0015] In one embodiment, a width of the extension tab is smaller than a width of the first armature, and a thickness of the extension tab is smaller than a thickness of the first armature.

[0016] In one embodiment, a width profile of the extension tab is consistent with a contour shape of a corresponding position of the plastic swing arm.

[0017] In one embodiment, the armature assembly further includes a second armature parallel to the first armature, the plastic part simultaneously encasing the middle portion of the first armature and a middle portion of the second armature; one surface of the middle portion of the second armature is provided with a rough structure to increase a contact area between the second armature and the plastic part so as to enhance bonding force between the second armature and the plastic part.

[0018] In one embodiment, the second armature is provided with at least one through-hole penetrating its thickness, and the plastic part has a filling structure filling the through-hole.

[0019] According to another aspect of the present disclosure, an electromagnetic relay includes the seesaw-type armature assembly according to the present disclosure.

[0020] Compared with the prior art, the present disclosure provides following advantages: 1. In the present disclosure, a surface of the middle portion of the first armature is provided with a rough structure, such as a mesh structure. Such configuration can increase the contact area between the first armature and the plastic part through the rough structure, thereby enhancing bonding force between the first armature and the plastic part. Positioning the rough structure on the surface in contact with the plastic part does not affect surface contact between a permanent magnet and the first armature, thereby ensuring that magnetic conduction performance remains unaffected. 2. In the present disclosure, the middle portion of the first armature is further provided with at least one first through-hole penetrating its thickness; the plastic part has a filling structure that fills the first through-hole. Such configuration can achieve an anti-detachment function between the first armature and the plastic part via the filling structure, further enhancing the bonding force between the first armature and the plastic part. 3. In the present disclosure, an end portion of the first armature is additionally provided with an extension tab that is bent and extended outward; the extension tab is embedded in the corresponding plastic swing arm. Such configuration, on the one hand, can shorten a force arm of the plastic swing arm; with a shorter force arm, the plastic swing arm is less prone to be deformed under the same force value; on the other hand, the plastic swing arm encloses the extension tab of the first armature, to increase a bonding area where both surfaces of the extension tab are adhered to the plastic swing arm, so as to improve the bonding force between the plastic part and the first armature, enhance the bonding strength between a root of the plastic swing arm and the first armature, and prevent mutual detachment of the plastic swing arm and the first armature when the plastic swing arm is subjected to force. Meanwhile, the structure is simply formed; for example, the extension tab is embedded in the plastic part, which does not affect magnetic contact (magnetic pole faces) between the armature and the yoke. 4. In the present disclosure, the width profile of the extension tab is consistent with the contour shape of the corresponding position of the plastic swing arm. Such configuration further can increase the bonding strength between the first armature and the plastic swing arm, to further prevent mutual detachment between the plastic swing arm and the first armature when the plastic swing arm is subjected to force.

[0021] The preferred embodiments will be illustrated with reference to the accompanying drawings. The above and other objectives, features, and advantages of the present disclosure will be more apparent.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a top view of a first armature of an embodiment of the seesaw-type armature assembly according to the present disclosure. FIG. 2 is a bottom view of a second armature of an embodiment of the seesaw-type armature assembly according to the present disclosure. FIG. 3 is a schematic view showing cooperation of the first armature, the second armature, and a permanent magnet in an embodiment of the seesaw-type armature assembly according to the present disclosure. FIG. 4 is a front view of an embodiment of the seesaw-type armature assembly according to the present disclosure. FIG. 5 is a top view of an embodiment of the seesaw-type armature assembly according to the present disclosure. FIG. 6 is a cross-sectional view of an embodiment of the seesaw-type armature assembly according to the present disclosure. FIG. 7 is a cross-sectional view taken along line A-A in FIG. 6. FIG. 8 is a schematic view showing a partial structure of an embodiment of the electromagnetic relay according to the present disclosure. FIG. 9 is a front view of the first armature of an embodiment of the armature assembly according to the present disclosure. FIG. 10 is an enlarged view of portion A in FIG. 9. FIG. 11 is a top view of the first armature of an embodiment of the armature assembly according to the present disclosure. FIG. 12 is a perspective schematic view of the first armature of an embodiment of the armature assembly according to the present disclosure. FIG. 13 is a front view of the second armature of an embodiment of the armature assembly according to the present disclosure. FIG. 14 is an enlarged view of portion B in FIG. 13. FIG. 15 is a bottom view of the second armature of an embodiment of the armature assembly according to the present disclosure. FIG. 16 is a perspective schematic view of the second armature of an embodiment of the armature assembly according to the present disclosure. FIG. 17 is a front view of an embodiment of the armature assembly according to the present disclosure. FIG. 18 is a bottom view of an embodiment of the armature assembly according to the present disclosure. FIG. 19 is a perspective schematic view of an embodiment of the armature assembly according to the present disclosure. DETAILED DESCRIPTION

[0023] Now, the exemplary implementations will be described more completely with reference to the accompanying drawings. However, the exemplary implementations can be implemented in various forms and should not be construed as limiting the implementations as set forth herein. Although terms having opposite meanings such as "up" and "down" are used herein to describe the relationship of one component relative to another component, such terms are used herein only for the sake of convenience, for example, "in the direction illustrated in the figure". It can be understood that if a device denoted in the drawings is turned upside down, a component described as "above" something will become a component described as "under" something. When a structure is described as "above" another structure, it probably means that the structure is integrally formed on another structure, or, the structure is "directly" disposed on another structure, or, the structure is "indirectly" disposed on another structure through an additional structure.

[0024] Words such as "one", "an / a", "the" and "said" are used herein to indicate the presence of one or more elements / component parts / and others. Terms "including", and "having" have an inclusive meaning which means that there may be additional elements / component parts / and others in addition to the listed elements / component parts / and others. Terms "first", "second", "third" and "fourth" are used herein only as markers, and they do not limit the number of objects modified after them.

[0025] Referring to FIGS. 1 to 8, a seesaw-type armature assembly according to the present disclosure includes a first armature 1 and a plastic part 2.

[0026] The first armature 1 includes, in sequence along its length direction L, a first end portion 16, a middle portion 15, and a second end portion 17. The middle portion 15 of the first armature 1 has a first surface and a second surface opposite to each other.

[0027] The plastic part 2 encases the middle portion 15 of the first armature 1. The first end portion 16 and the second end portion 17 of the first armature 1 are exposed outside the plastic part 2.

[0028] The plastic part 2 has two plastic swing arms 21 respectively connected to the two ends of the plastic part 2. An arrangement direction of the two plastic swing arms 21 is coincident with the length direction L of the first armature 1. The two plastic swing arms 21 respectively extend from the two ends of the plastic part 2 away from the middle portion 15 of the first armature 1 and are inclined toward a thickness direction of the first armature 1, and the thickness direction is perpendicular to both the length direction and the width direction. One surface (e.g., the first surface) of the middle portion 15 of the first armature 1 is provided with a rough structure, to increase a contact area between the first armature 1 and the plastic part 2 so as to enhance the bonding force therebetween.

[0029] In some alternative embodiments, the plastic part 2 may have only one plastic swing arm 21, which is connected to one end of the plastic part 2.

[0030] In this embodiment, the rough structure is a mesh structure 11 formed on the surface of the first armature 1. Certainly, the rough structure is not limited to a mesh structure and may be any other structure capable of increasing the surface roughness of the middle portion 15 of the first armature 1, such as a wavy structure.

[0031] In this embodiment, the rough structure 11 is provided on a surface that contacts the plastic part 2. Positioning the rough structure on the surface that contacts the plastic part 2 does not affect the surface contact between the permanent magnet and the armature, to ensure that the magnetic conduction performance remains unaffected.

[0032] In this embodiment, the middle portion 15 of the first armature 1 is further provided with at least one first through-hole 12 penetrated in the thickness direction. Specifically, the number of first through-holes 12 is two, and the cross-section of each first through-hole 12 is in an inverted-T shape. The plastic part 2 has a filling structure that completely fills the first through-hole 12.

[0033] In this embodiment, an end portion of the first armature 1 is provided with an outward-bent extension tab 13 that is embedded in the corresponding plastic swing arm 21, thereby increasing bonding strength between a root of the plastic swing arm 21 and the first armature 1 and preventing mutual detachment of the plastic swing arm 21 and the first armature 1 when the plastic swing arm 21 is subjected to force.

[0034] In this embodiment, the extension tab 13 of the first armature 1 is embedded in the plastic swing arm 21 during injection molding of the plastic part 2. Certainly, the extension tab 13 of the first armature 1 may alternatively be embedded in the plastic swing arm 21 during assembly of the first armature 1 and the plastic part 2.

[0035] In this embodiment, a width of the extension tab 13 is less than a width W of a body of the first armature 1. When a width of the plastic swing arm 21 is also set to be less than the width W of the body of the first armature 1, the width of the extension tab 13 is likewise set to be less than the width of the plastic swing arm 21, thereby ensuring that the extension tab 13 can be embedded in the plastic swing arm 21 during injection molding of the plastic part 2. Thickness of the extension tab 13 is less than the thickness of the main body of the first armature 1.

[0036] In this embodiment, a width profile of the extension tab 13 is consistent with a contour shape of a corresponding position of the plastic swing arm 21.

[0037] In this embodiment, the extension tab 13 is further provided with a second through-hole 131 penetrated in the thickness direction. The plastic part 2 has a filling structure that completely fills the second through-hole 131.

[0038] As shown in FIGS. 2 to 4, in this embodiment, the armature assembly further includes a second armature 3 and a permanent magnet 4. The second armature 3 is parallel to the first armature 1, and the permanent magnet 4 is sandwiched between the middle portion of the first armature 1 and a middle portion of the second armature 3. The plastic part 2 simultaneously encases the middle portion 15 of the first armature 1 and the middle portion of the second armature 3, and completely encloses the permanent magnet 4 within the plastic part 2. A surface (i.e., the first surface) of the first armature 1 away from the second armature 3 is provided with a rough structure. A surface of the middle portion of the second armature 3 away from the first armature 1 is also provided with a rough structure. Thus, the contact area among the first armature 1, the second armature 3 and the plastic part can be increased, and the bonding force among the first armature 1, the second armature 3 and the plastic part can be enhanced.

[0039] In this embodiment, the rough structure is a mesh structure 31 formed on the surface of the second armature 3. The mesh structure 31 is provided on the surface of the second armature 3 in contact with the plastic part 2. The middle portion of the second armature 3 is further provided with at least one third through-hole 32 penetrated in the thickness direction. Specifically, the number of the third through-holes 32 is two, the cross-section of each third through-hole 32 is in an inverted-T shape. The plastic part has a filling structure that completely fills the third through-hole 32.

[0040] An electromagnetic relay according to the present disclosure includes the above-described seesaw-type armature assembly, a static spring 51, a static contact 52, a moving contact spring 61, a moving contact 62, a moving spring leading-out tab 63, a magnetic circuit portion 7 and a push card 8. The first armature 1, the second armature 3 and the permanent magnet 4 of the armature assembly are combined by the plastic part 2 into an I-shaped integral member. A yoke 71 of the magnetic circuit portion 7 is fitted into openings on both sides of the I-shaped structure of the armature assembly. The static contact 52 has one end that is secured to the static spring 51, and the other end that usually projects outside the relay housing as a leading-out portion. The moving contact spring 61 has one end that is fixed with the moving contact 62, and the other end is fixed to one end of the moving spring leading-out tab 63; the other end of the moving spring leading-out tab 63 used as a leading-out portion protrudes outside the relay housing. The moving contact 62 is configured to be cooperated with the static contact 52. The armature assembly is cooperated with one end of the push card 8 through the plastic swing arm 21, and the other end of the push card 8 is cooperated with the moving contact spring 61.

[0041] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, the surface of the middle portion of the first armature 1 is provided with a rough structure, such as the mesh structure 11. Through this rough structure, the contact area between the first armature 1 and the plastic part 2 may be increased, so that the bonding force between the first armature and the plastic part will be enhanced.

[0042] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, the middle portion of the first armature 1 is further provided with at least one first through-hole 12 penetrated in the thickness direction. The through-hole 12 has an inverted-T shaped cross section. The plastic part has a filling structure that completely fills the first through-hole 12. Such configuration of the present disclosure may provide an anti-detachment function between the first armature and the plastic part, so as to enhance the bonding force between the first armature and the plastic part

[0043] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, an end portion of the first armature 1 is provided with a bent extension tab 13 that is embedded in the corresponding plastic swing arm 21. Such structure of the present disclosure, on the one hand, can shorten the force arm of the plastic swing arm, with a shorter force arm, the plastic swing arm is less likely to be deformed under the same force value; on the other hand, the plastic swing arm encloses the extension tabs 13, to increase the bonding area (both faces of the extension tabs are adhered to the plastic swing arm), so as to improve the bonding force between the plastic part and the first armature, increase the bonding strength between the root of the plastic swing arm and the first armature, and prevent mutual detachment when the plastic swing arm is subjected to force. At the same time, the structure is simply formed, for example, the extension tabs are embedded in the plastic part without affecting magnetic contact (magnetic pole faces) between the armature and the yoke.

[0044] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, a width profile of the extension tab 13 is consistent with a contour shape of the corresponding position of the plastic swing arm 21. This configuration further increases the bonding strength between the end portion of the first armature and the plastic swing arm, thereby preventing mutual detachment when the plastic swing arm is subjected to force.

[0045] In addition, in existing armature assemblies, the armature is cooperated with mold inserts. During injection molding, since a thickness tolerance of the armature is ±0.1 mm, a gap of 0.1 mm or more may be formed between the armature and one of the mold inserts. Under injection pressure, molten plastic may flow through these gaps to a periphery of the mold to form a flash.

[0046] The present disclosure further provides an armature assembly and an electromagnetic relay, in which the armature is locally thinned at the positions cooperating with mold inserts to adjust the tolerance, thereby reducing the possibility of flash formation during injection molding and enhancing the bonding strength between the armature and the plastic part.

[0047] According to one aspect of the present disclosure, an armature assembly includes: a first armature including a first end portion, a middle portion, and a second end portion in sequence along its length direction; a plastic part encasing the middle portion of the first armature; in which the plastic part is provided with at least one plastic swing arm, along the length direction of the first armature, the plastic swing arm extends from an end of the plastic part away from the middle portion of the first armature and is inclined toward the thickness direction of the first armature; in which the first end portion and the second end portion of the first armature are provided with mold-insert mating part, which has a thickness less than a thickness of the body of the first armature.

[0048] According to one embodiment of the present disclosure, the mold-insert mating part is close to the middle portion of the first armature.

[0049] According to one embodiment of the present disclosure, the first end portion and the second end portion of the first armature have thinned structures at the mold-insert mating parts.

[0050] According to one embodiment of the present disclosure, the first end portion and the second end portion of the first armature respectively have first and second surfaces opposite to each other, and the thinned structure is formed by removing part of the material from the first surface or the second surface along the thickness direction of the first armature.

[0051] According to one embodiment of the present disclosure, the thinned structures are located on both sides of the first surface or the second surface along the width direction of the first armature.

[0052] According to one embodiment of the present disclosure, the plastic part is provided with two plastic swing arms, which along the length direction of the first armature, extend from the two ends of the plastic part away from the middle portion of the first armature and are inclined toward the thickness direction of the first armature. The first end portion and the second end portion of the first armature are respectively provided with an extension tab, which is bent and extends to a direction away from the middle portion, and embedded in the corresponding plastic swing arm.

[0053] According to one embodiment of the present disclosure, the armature assembly further includes a second armature parallel to the first armature, the plastic part simultaneously encases the middle portion of the first armature and the middle portion of the second armature; the thickness of the mold-insert mating parts at the two ends of the second armature is less than the thickness of the body of the second armature.

[0054] According to one embodiment of the present disclosure, the mold-insert mating parts at the two ends of the second armature are thinned structures.

[0055] According to one embodiment of the present disclosure, the thinned structures of the second armature are formed by removing part of the material from a surface of the second armature away from the first armature.

[0056] According to one embodiment of the present disclosure, the thinned structures of the second armature are close to the middle portion of the second armature and extend across the entire width of the second armature.

[0057] According to another aspect of the present disclosure, an electromagnetic relay includes the armature assembly described above.

[0058] Compared with the prior art, the present disclosure provides the following advantages: 1. In the present disclosure, a mold-insert mating part is provided at a junction between the two ends of the first armature and the plastic part, and a thickness of the mold-insert mating part is less than the thickness of the body of the first armature. Such structure of the present disclosure can locally thin the armature where the armature is cooperated with the mold inserts, and control the tolerance within 0.04, effectively improve the formation of flash, and enhance the bonding strength between the armature and the plastic part. 2. In the present disclosure, the plastic part is provided with plastic swing arms that extend from the ends of the plastic part away from the middle portion of the first armature and are inclined toward the thickness direction of the first armature. Extension tabs bent outward are respectively provided at the two ends of the first armature and embedded in the corresponding plastic swing arms. Such structure of the present disclosure, on the one hand, can shorten the force arm of the plastic swing arm, with a shorter force arm, the plastic swing arm is less likely to be deformed under the same force value; on the other hand, the plastic swing arm encloses the extension tabs of the first armature, to increase the bonding area (both faces of the extension tabs are adhered to the plastic swing arm), so as to improve the bonding force between the plastic part and the first armature, increase the bonding strength between the root of the plastic swing arm and the first armature, and prevent mutual detachment between the plastic swing arm and the first armature when the plastic swing arm is subjected to force. At the same time, the structure is simply formed, for example, the extension tabs are embedded in the plastic part without affecting magnetic contact (magnetic pole faces) between the armature and the yoke.

[0059] Referring to FIGS. 9 to 19, an armature assembly according to the present disclosure includes a first armature 1 and a plastic part 2.

[0060] The first armature 1 includes a first end portion 16, a middle portion 15, and a second end portion 17 in sequence along its length direction L. The middle portion 15 of the first armature 1 has a first surface and a second surface opposite to each other.

[0061] The plastic part 2 encases the middle portion 15 of the first armature 1; the first end portion 16 and the second end portion 17 of the first armature 1 are exposed outside the plastic part 2.

[0062] The plastic part 2 has two plastic swing arms 21 respectively connected to the two ends of the plastic part 2. An arrangement direction of the two plastic swing arms 21 is aligned with the length direction L of the first armature 1. The two plastic swing arms 21 respectively extend from the two ends of the plastic part 2 away from the middle portion 15 of the first armature 1 and are inclined toward the thickness direction of the first armature 1, and the thickness direction is perpendicular to both the length direction and the width direction.

[0063] A mold-insert mating part is provided at a junction between the first end portion 16 and the second end portion 17 of the first armature 1 and the plastic part 2; the mold-insert mating part is close to the middle portion 15 of the first armature 1. The thickness of the mold-insert mating part is less than the thickness T of the main body of the first armature 1.

[0064] In this embodiment, the first end portion 16 and the second end portion 17 of the first armature 1 have single-side thinned structures 10 at the mold-insert mating part; for example, each thinned structure is formed by removing part of the material from the first surface or the second surface along the thickness direction of the first armature.

[0065] In this embodiment, the plastic part 2 has two plastic swing arms 21. Along the length direction of the first armature 1, the two plastic swing arms 21 extend from the two ends of the plastic part 2 away from the middle portion 15 of the first armature 1 and are inclined toward the thickness direction of the first armature 1. Extension tabs 13 bent outward are respectively provided at the two ends of the first armature 1 and are embedded in the corresponding plastic swing arms 21. Specifically, the extension tabs 13 of the first armature 1 may be embedded in the plastic swing arms 21 during injection molding of the plastic part 2. Alternatively, the extension tabs 13 may be embedded in the plastic swing arms 21 during assembly of the first armature 1 and the plastic part 2. The single-side thinned structure 10 of the first armature 1 is located on one surface (i.e., the first surface) along the thickness direction of the first armature 1.

[0066] In this embodiment, the single-side thinned structures 10 at the two ends of the first armature 1 are respectively located on both sides along the width of the first armature 1, as shown in FIG. 11.

[0067] In this embodiment, the armature assembly further includes a second armature 3, which is parallel to the first armature 1. The plastic part 2 simultaneously encases the middle portions of both the first armature 1 and the second armature 3. The thickness of the mold-insert mating parts at the two ends of the second armature 3 is less than the thickness of the main body of the second armature 3.

[0068] In this embodiment, the mold-insert mating parts at the two ends of the second armature 3 are single-side thinned structures 30 similar to the mold-insert mating parts of the first armature 1.

[0069] In this embodiment, the single-side thinned structures 30 of the second armature 3 are located on a surface opposite to the surface on which the single-side thinned structures 10 of the first armature 1 are located. Specifically, as shown in FIG. 17, the single-side thinned structures 10 of the first armature 1 face upward while the single-side thinned structures 30 of the second armature 3 face downward.

[0070] In this embodiment, the single-side thinned structures 30 of the second armature 3 are respectively located close to the middle portion of the second armature 3 and extend across the entire width thereof.

[0071] An electromagnetic relay according to the present disclosure includes the armature assembly described in the above embodiments.

[0072] In the armature assembly and electromagnetic relay of the present disclosure, mold-insert mating parts are provided at the junctions between the two ends of the first armature 1 and the plastic part 2. The thickness of the mold-insert mating parts is less than the thickness of the main body of the first armature 1. Such structure of the present disclosure can locally thin the armature where the armature is cooperated with the mold inserts, and control the tolerance within 0.04, effectively improve the formation of flash, and enhance the bonding strength between the armature and the plastic part.

[0073] In the armature assembly and electromagnetic relay of the present disclosure, the plastic part 2 is provided with plastic swing arms 21 that extend toward the direction away from the middle portion 15 of the first armature 1 from the ends of the plastic part 2 and are inclined toward the thickness direction of the first armature 1. The extension tabs 13 bent outward are respectively provided at the two ends of the first armature 1 and are embedded in the corresponding plastic swing arms 21. Such structure of the present disclosure, on the one hand, can shorten the force arm of the plastic swing arm 21, with a shorter force arm, the plastic swing arm 21 is less likely to be deformed under the same force value; on the other hand, the plastic swing arm 21 encloses the extension tabs 13 of the first armature 1, to increase the bonding area (both faces of the extension tabs are adhered to the plastic swing arm), so as to improve the bonding force between the plastic part 2 and the first armature 1, increase the bonding strength between the root of the plastic swing arm 21 and the first armature 1, and prevent mutual detachment between the plastic swing arm 21 and the first armature 1 when the plastic swing arm 21 is subjected to force. At the same time, the structure is simply formed, for example, the extension tabs 13 are embedded in the plastic part 2 without affecting magnetic contact (magnetic pole faces) between the armature and the yoke.

[0074] It should be understood that the application of the present disclosure is not limit to the detailed structure and arrangement of components provided in this specification. The present disclosure can have other embodiments, and can be implemented and carried out in various ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It should be understood that the disclosure disclosed and defined in this specification may extend to all alternative combinations of two or more individual features that are apparent or mentioned in the text and / or drawings. All of the different combinations form various alternative aspects of the present disclosure. Embodiments described in this specification illustrate the best modes known for carrying out the present disclosure, and will allow those skilled in the art to utilize the present disclosure.

Claims

1. A seesaw-type armature assembly, comprising: a first armature, comprising a first end portion, a middle portion, and a second end portion in sequence along a length direction; a plastic part encasing the middle portion of the first armature; wherein the middle portion of the first armature has a first surface and a second surface opposite to each other, and one of the first surface and the second surface is provided with a rough structure to increase a contact area between the first armature and the plastic part so as to enhance bonding force between the first armature and the plastic part; wherein the plastic part is provided with at least one plastic swing arm, along the length direction of the first armature, the plastic swing arm extends to a direction away from the middle portion of the first armature from at least one of two ends of the plastic part, and is inclined to a thickness direction of the first armature.

2. The seesaw-type armature assembly according to claim 1, wherein a portion of the plastic part in contact with the rough structure is a bonding portion, and the plastic swing arm is connected to the bonding portion.

3. The seesaw-type armature assembly according to claim 1, wherein the rough structure is a mesh structure.

4. The seesaw-type armature assembly according to claim 1, comprising two plastic swing arms correspondingly disposed at both ends of the plastic part.

5. The seesaw-type armature assembly according to claim 1, wherein the middle portion of the first armature is further provided with at least one first through-hole penetrating its thickness, and the plastic part has a filling structure filling the first through-hole.

6. The seesaw-type armature assembly according to claim 5, wherein a cross-section of the first through-hole is an inverted-T shape.

7. The seesaw-type armature assembly according to claim 1, wherein an extension tab is provided on the first end portion and / or the second end portion of the first armature, and the extension tab extends and is bent to a direction away from the middle portion and embedded in a corresponding plastic swing arm to increase bonding strength between a root of the plastic swing arm and the first armature, so as to prevent the plastic swing arm being forced from detaching from the first armature.

8. The seesaw-type armature assembly according to claim 7, wherein the extension tab of the first armature is embedded in corresponding plastic swing arm when the plastic part is injection molded.

9. The seesaw-type armature assembly according to claim 8, wherein a width of the extension tab is smaller than a width of the first armature, and a thickness of the extension tab is smaller than a thickness of the first armature.

10. The seesaw-type armature assembly according to claim 9, wherein a width profile of the extension tab is consistent with a contour shape of a corresponding position of the plastic swing arm.

11. The seesaw-type armature assembly according to claim 1, wherein the armature assembly further comprises a second armature parallel to the first armature, the plastic part simultaneously encasing the middle portion of the first armature and a middle portion of the second armature; one surface of the middle portion of the second armature is provided with a rough structure to increase a contact area between the second armature and the plastic part so as to enhance bonding force between the second armature and the plastic part.

12. The seesaw-type armature assembly according to claim 11, wherein the second armature is provided with at least one through-hole penetrating its thickness, and the plastic part has a filling structure filling the through-hole.

13. An electromagnetic relay, comprising the seesaw-type armature assembly according to any one of claims 1-12.

Images