Seesaw-type armature assembly and electromagnetic relay

Abstract

The seesaw-type armature assembly includes a first armature and a plastic part. The first armature has a first end, a middle part, and a second end, and the plastic part is coated on the middle part of the first armature. The middle part of the first armature has opposing first and second surfaces, one of which is provided with a rough surface structure to increase the contact area between the first armature and the plastic part and strengthen the bonding force between the first armature and the plastic part. The plastic part is provided with a plastic swing arm, which extends from the end of the plastic part in a direction away from the middle part of the first armature and is inclined in the thickness direction of the first armature.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese patent applications bearing application numbers 202320370436.4 and 202320370388.9, filed on March 2, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of relays, and more particularly to see-saw armature assemblies and electromagnetic relays. [Background technology]

[0003] A relay is an electronic control element that has a control system (also called input circuit) and a controlled system (also called output circuit). It is usually used in automatic control circuits and is actually an "automatic switch" that controls large currents with small currents. Therefore, in the circuit, it plays roles such as automatic adjustment, safety protection, and conversion circuit.

[0004] The armature is an important component of an electromagnetic relay, and the armature works in conjunction with the magnetic circuit of the electromagnetic relay to operate the movable spring in the contact portion of the electromagnetic relay, thereby bringing the movable contact and fixed contact into contact or separating them.

[0005] The armature assembly of a conventional electromagnetic relay includes an armature, a plastic part, and a plastic swing arm. The plastic part is coated onto a portion of the armature through an injection molding process, and the plastic part and the armature form an integrated assembly. The plastic swing arm is also molded during the injection molding process and becomes part of the plastic part. However, due to different shrinkage rates between the iron part (armature) and the plastic part, the bonding strength between them decreases after high-temperature baking, making it impossible to integrate the armature and the plastic part. Summary of the Invention

[0006] An object of the present disclosure is to overcome the drawbacks of the prior art and provide a seesaw type armature assembly and an electromagnetic relay that enhances the bonding force between the armature and the plastic part by adding a rough surface structure to the surface of the armature.

[0007] According to one aspect of the present disclosure, a see-saw armature assembly includes: a first armature including, in order along its length, a first end, a middle portion, and a second end, and a plastic part coated on the middle portion of the first armature; an intermediate portion of the first armature having a first surface and a second surface facing each other, and a rough surface structure is provided on one of the first surface and the second surface, thereby increasing a contact area between the first armature and the plastic part and strengthening a bonding force between the first armature and the plastic part; The plastic part is provided with at least one plastic swing arm, which extends from at least one of both ends of the plastic part along the length of the first armature in a direction away from the middle of the first armature and is inclined in the thickness direction of the first armature.

[0008] According to one embodiment of the present disclosure, a portion of the plastic part that contacts the rough surface structure is a joint, and the plastic swing arm is connected to the joint.

[0009] According to one embodiment of the present disclosure, the rough surface structure is a mesh structure.

[0010] According to one embodiment of the present disclosure, there are two plastic swing arms, and the two plastic swing arms are arranged at opposite ends of the plastic part.

[0011] According to one embodiment of the present disclosure, 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 that fills the first through hole.

[0012] According to one embodiment of the present disclosure, the first through hole has an inverted T-shaped cross section.

[0013] According to one embodiment of the present disclosure, an extension piece is provided at the first end and / or second end of the first armature, and the extension piece is bent and extended in a direction away from the intermediate portion and embedded in the corresponding plastic swing arm, thereby improving the bonding strength between the root portion of the plastic swing arm and the first armature and preventing the plastic swing arm from separating from the first armature when force is applied.

[0014] According to one embodiment of the present disclosure, the extension piece of the first armature is embedded in the corresponding plastic swing arm during injection molding of the plastic part.

[0015] According to one embodiment of the present disclosure, the width of the extension piece is smaller than the width of the first armature, and the thickness of the extension piece is smaller than the thickness of the first armature.

[0016] According to one embodiment of the present disclosure, the shape of the width of the extension piece matches the shape of the corresponding portion of the plastic swing arm.

[0017] According to one embodiment of the present disclosure, the armature assembly further includes the second armature, the second armature is parallel to the first armature, the plastic part simultaneously covers a middle portion of the first armature and a middle portion of the second armature, and one surface of the middle portion of the second armature is provided with a rough surface structure, which increases the contact area between the second armature and the plastic part and strengthens the bonding force between the second armature and the plastic part.

[0018] According to one embodiment of the present disclosure, the second armature is provided with at least one through hole passing through its thickness, and the plastic part has a filling structure for filling the through hole.

[0019] According to another aspect of the present disclosure, an electromagnetic relay includes a see-saw armature assembly as described herein.

[0020] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0021] 1. In the present disclosure, a roughened surface structure, such as a mesh structure, is provided on the surface of the middle portion of the first armature. The structure of the present disclosure increases the contact area between the first armature and the plastic part by providing a roughened surface structure, such as a mesh structure, on the surface of the first armature, thereby strengthening the bonding force between the first armature and the plastic part. Because the roughened surface structure is located on the surface that comes into contact with the plastic part, it is guaranteed that it will not affect the surface contact between the permanent magnet and the first armature, nor will it affect the magnetic conduction effect.

[0022] 2. In the present disclosure, the middle portion of the first armature is further provided with at least one first through hole penetrating the thickness thereof, and the plastic part has a filling structure that fills the first through hole. This structure of the present disclosure can prevent separation between the first armature and the plastic part through the filling structure, and can further strengthen the bonding force between the first armature and the plastic part.

[0023] 3. In the present disclosure, the end of the first armature is further provided with an extension piece that is bent outward and extends, and the extension piece is embedded in the corresponding plastic swing arm. This structure of the present disclosure, on the one hand, allows the force arm of the plastic swing arm to be shortened, and because the force arm is shorter, the plastic swing arm is less likely to deform under the same force value. On the other hand, because the plastic swing arm envelops the extension piece of the first armature, the adhesive area is increased, and because both sides of the extension piece are bonded to the plastic swing arm, the bonding force between the plastic part and the first armature is improved, and the bonding strength between the base of the plastic swing arm and the first armature can be improved. This prevents the plastic swing arm and the first armature from separating from each other when the plastic swing arm is subjected to force. At the same time, this structure is easy to mold; for example, the extension piece is embedded in the plastic part, so it does not affect the magnetic contact (pole faces) between the armature and the yoke.

[0024] 4. In the present disclosure, the width shape of the extension piece matches the outer shape of the corresponding portion of the plastic swing arm. This structure of the present disclosure improves the bonding strength between the first armature and the plastic swing arm, and further prevents the plastic swing arm and the first armature from separating from each other when force is applied to the plastic swing arm.

[0025] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of preferred embodiments with reference to the accompanying drawings. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is a top view of a first armature of an embodiment of a see-saw armature assembly of the present disclosure. [Figure 2] FIG. 10 is a bottom view of a second armature of an embodiment of a see-saw armature assembly of the present disclosure. [Figure 3] 1 is a schematic diagram of a first armature, a second armature, and a permanent magnet cooperating in an embodiment of a see-saw armature assembly of the present disclosure; FIG. [Figure 4] FIG. 1 is a front view of an embodiment of a see-saw armature assembly of the present disclosure. [Figure 5] FIG. 1 is a top view of an example see-saw armature assembly of the present disclosure. [Figure 6] FIG. 1 is a cross-sectional view of an embodiment of a see-saw armature assembly of the present disclosure. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. [Figure 8] 1 is a partial structural schematic diagram of an embodiment of an electromagnetic relay of the present disclosure. [Figure 9] FIG. 2 is a front view of a first armature of an embodiment of an armature assembly of the present disclosure. [Figure 10] FIG. 10 is an enlarged schematic view of part A in FIG. 9. [Figure 11] FIG. 2 is a top view of a first armature of an embodiment of an armature assembly of the present disclosure. [Figure 12] FIG. 2 is a schematic diagram of the three-dimensional structure of a first armature of an embodiment of an armature assembly of the present disclosure. [Figure 13] FIG. 10 is a front view of a second armature of an embodiment of the armature assembly of the present disclosure. [Figure 14] FIG. 14 is an enlarged schematic view of part B in FIG. [Figure 15] FIG. 10 is a bottom view of a second armature of an embodiment of an armature assembly of the present disclosure. [Figure 16] FIG. 10 is a schematic diagram of the three-dimensional structure of a second armature of an embodiment of the armature assembly of the present disclosure. [Figure 17] FIG. 1 is a front view of an embodiment of an armature assembly of the present disclosure. [Figure 18] FIG. 1 is a bottom view of an example armature assembly of the present disclosure. [Figure 19] 1 is a schematic diagram of a three-dimensional structure of an embodiment of an armature assembly of the present disclosure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in various forms and should not be construed as limited to the embodiments described herein. Although relative terms such as "above" and "below" are used herein to describe the relative relationship of one component to another component shown in the drawings, these terms are used herein merely for convenience, e.g., based on the orientation of the example shown in the drawings. It is understood that if the device shown in the drawings is inverted and turned upside down, the component described as "above" would become the component "below." Other relative terms, such as "top" and "bottom," have similar meanings. When a structure is "above" another structure, it can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

[0028] The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements / components / etc. The terms "comprise" and "have" are open-ended and mean that other elements / components / etc. may be present in addition to the listed elements / components / etc. The terms "first," "second," etc. are used as indicative terms only and do not limit the number of their objects.

[0029] As shown in FIGS. 1 to 8, the seesaw-type armature assembly of the present disclosure includes a first armature 1 and a plastic part 2.

[0030] The first armature 1 includes, in order along its length direction L, a first end portion 16, an intermediate portion 15, and a second end portion 17. The intermediate portion 15 of the first armature 1 has opposing first and second surfaces.

[0031] The plastic part 2 encloses therein an intermediate portion 15 of the first armature 1 , and a first end portion 16 and a second end portion 17 of the first armature 1 are exposed from said plastic part 2 .

[0032] The plastic part 2 has two plastic swing arms 21 connected to both ends of the plastic part 2, respectively. The arrangement direction of the two plastic swing arms 21 coincides with the length direction L of the first armature 1. The two plastic swing arms 21 extend from both ends of the plastic part 2 in a direction away from the middle portion 15 of the first armature 1 and are inclined in the thickness direction of the first armature 1. Here, the thickness direction of the first armature 1 is perpendicular to the length direction and width direction. One surface of the middle portion of the first armature 1, for example the first surface, is provided with a rough surface structure, which increases the contact area between the first armature and the plastic part, thereby strengthening the bonding force between the first armature and the plastic part.

[0033] In some other embodiments, the plastic part 2 may have only one plastic swing arm 21 , and the plastic swing arm 21 may be connected to one end of the plastic part 2 .

[0034] In this embodiment, the rough surface structure is a mesh structure 11 formed on the surface of the first armature 1. Of course, the rough surface structure is not limited to a mesh structure, and may be any other structure that can increase the surface roughness of the middle part of the first armature 1, such as a corrugated structure.

[0035] In this embodiment, the rough surface structure 11 is disposed on the surface that comes into contact with the plastic part 2. Because the rough surface structure is disposed on the surface that comes into contact with the plastic part, it is ensured that it does not affect the surface contact between the permanent magnet and the armature, and does not affect the magnetic conduction effect.

[0036] In this embodiment, at least one first through hole 12 is further provided in the middle portion of the first armature 1, penetrating the thickness direction thereof. Specifically, the number of the first through holes 12 is two, and the cross section of the first through holes 12 is inverted T-shaped. The plastic part 2 has a filling structure, which can be completely filled in the first through hole 12.

[0037] In this embodiment, an extension piece 13 bent outward is provided at the end of the first armature 1, and the extension piece 13 is embedded in the corresponding plastic swing arm 21, thereby improving the bonding strength between the root of the plastic swing arm 21 and the first armature 1 and preventing the plastic swing arm 21 and the first armature 1 from separating from each other when force is applied to the plastic swing arm 21.

[0038] In this embodiment, the extension piece 13 of the first armature 1 is embedded in the plastic swing arm 21 during injection molding of the plastic part 2. Of course, it is also possible to embed the extension piece 13 of the first armature 1 in the plastic swing arm 21 when assembling the first armature 1 and the plastic part 2.

[0039] In this embodiment, the width of the extension piece 13 is smaller than the width W of the main body of the first armature 1. When the width of the plastic swing arm 21 is also set smaller than the width of the main body of the first armature 1, the width of the extension piece 13 must also be set smaller than the width of the plastic swing arm 21, so that the extension piece 13 can be embedded in the plastic swing arm 21 during injection molding of the plastic part 2. The thickness of the extension piece 13 is smaller than the thickness of the main body of the first armature 1.

[0040] In this embodiment, the width of the extension piece 13 is the same as the width of the corresponding portion of the plastic swing arm 21 .

[0041] In this embodiment, the extension piece 13 is further provided with a second through hole 131 that penetrates through its thickness. The plastic part 2 has a filling structure that is completely filled in the second through hole 131.

[0042] 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 the middle portion of the second armature 3. The plastic part 2 simultaneously covers the middle portion 15 of the first armature 1 and the middle portion of the second armature 3, and the plastic part 2 completely encases the permanent magnet 4 within the plastic part 2. The roughened surface structure is provided on the surface of the first armature 1 away from the second armature 3, i.e., the first surface. The roughened surface structure is also provided on the surface of the middle portion of the second armature 3 away from the first armature 1, thereby increasing the contact area between the first armature 1 and the second armature 3 and the plastic part, thereby strengthening the bonding force between the first armature 1 and the second armature 3 and the plastic part.

[0043] In this embodiment, the rough surface 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 that contacts the plastic part 2. At least one third through hole 32 is further provided in the middle of the second armature 3, penetrating through the thickness direction thereof. Specifically, the number of the third through holes 32 may be two, and the cross section of the third through holes 32 may be in an inverted T-shape. The plastic part has a filling structure that can completely fill the third through holes 32.

[0044] The electromagnetic relay of the present disclosure includes the seesaw-type armature assembly as described above, a fixed spring 51, a fixed contact 52, a movable contactor 61, a movable contact 62, a movable spring pull-out piece 63, a magnetic circuit unit 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 into an I-shaped integrated part via a plastic part 2, and the yoke 71 of the magnetic circuit unit 7 is fitted into openings on both sides of the I-shaped structure of the armature assembly. The fixed contact 52 is fixed to one end of the fixed spring 51, and the other end of the fixed spring 51 typically extends outside the relay housing as a pull-out portion. The movable contact 62 is fixed to one end of the movable contactor 61, the other end of which is fixed to one end of the movable spring pull-out piece 63, the other end of which extends outside the relay housing as a pull-out portion, and the movable contact 62 and the fixed contact 52 are in a cooperating position. The armature assembly cooperates with one end of the push card 8 via the plastic swing arm 21, and the other end of the push card 8 cooperates with the movable contactor 61.

[0045] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, a roughened surface structure, such as a mesh structure 11, is provided on the surface of the middle part of the first armature 1. Such a structure of the present disclosure increases the contact area between the first armature 1 and the plastic part 2 by the roughened surface structure of the armature surface, such as the mesh structure 11, thereby strengthening the bonding force between the first armature and the plastic part.

[0046] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, at least one first through hole 12 is further provided in an intermediate portion of the first armature 1, penetrating through the thickness direction thereof, and the cross section of the first through hole 12 may be inverted T-shaped. The plastic part has a filling structure that completely fills the first through hole 12. Such a structure of the present disclosure can prevent separation between the first armature and the plastic part through the armature's through hole, and can further strengthen the bonding force between the first armature and the plastic part.

[0047] In the seesaw-type armature assembly and electromagnetic relay disclosed herein, a bent extension piece 13 is provided at the end of the first armature 1, and the extension piece 13 is embedded in the corresponding plastic swing arm 21. This structure disclosed herein, on the one hand, shortens the force arm of the plastic swing arm, making the plastic swing arm less susceptible to deformation under the same force. On the other hand, the plastic swing arm envelops the extension piece of the first armature, increasing the bonding area. Because both sides of the extension piece are bonded to the plastic swing arm, the bonding strength between the plastic part and the first armature is improved, and the bonding strength between the root of the plastic swing arm and the first armature is also improved, preventing the plastic swing arm and the first armature from separating from each other when the plastic swing arm is subjected to force. At the same time, this structure is easy to mold, and because it is embedded in a plastic part, for example, it does not affect the magnetic contact (pole faces) between the armature and the yoke.

[0048] In the seesaw-type armature assembly and electromagnetic relay of the present disclosure, the width shape of the extension piece 13 matches the shape of the corresponding portion of the plastic swing arm 21. This structure of the present disclosure improves the bonding strength between the end of the first armature and the plastic swing arm, and further prevents the plastic swing arm and the first armature from separating from each other when force is applied to the plastic swing arm.

[0049] In addition, in conventional armature assemblies, the armature is fitted with a mold insert. During injection molding, the thickness tolerance of the armature material is ±0.1 mm, so gaps of 0.1 mm or more occur where the armature fits with the mold insert. In these locations, the injection molding pressure causes the molten plastic to pass through these gaps and flow out to the periphery of the mold, resulting in flash.

[0050] The present disclosure further provides an armature assembly and an electromagnetic relay in which the armature at the mating location with the mold insert is locally thinned to adjust tolerances, thereby reducing the possibility of flash during injection molding and enhancing the bonding strength between the armature and the plastic part.

[0051] According to one aspect of the present disclosure, the armature assembly comprises: a first armature including, in longitudinal order, a first end, an intermediate portion, and a second end; a plastic part coated on a middle portion of the first armature; The plastic part is provided with at least one plastic swing arm, the plastic swing arm extending from an end of the plastic part in a direction away from a middle portion of the first armature along a length direction of the first armature and inclined in a thickness direction of the first armature; The first and second ends of the first armature are provided with mold insert fitting portions, and the thickness of the mold insert fitting portions is thinner than the thickness of the main body of the first armature.

[0052] According to one embodiment of the present disclosure, the mold insert fitting location is adjacent to a middle portion of the first armature.

[0053] According to one embodiment of the present disclosure, the first end and the second end of the first armature have a thin-walled structure at the mold insert fitting location.

[0054] According to one embodiment of the present disclosure, the first end and second end of the first armature have opposing first and second surfaces, respectively, and the thin-walled structure is formed by removing a portion of material from the first surface or the second surface along a thickness direction of the first armature.

[0055] According to one embodiment of the present disclosure, the thin-walled structures are disposed on both sides along the width direction of the first surface or the second surface of the first armature.

[0056] According to one embodiment of the present disclosure, the plastic part is provided with two plastic swing arms, and the plastic swing arms extend from both ends of the plastic part along the length direction of the first armature in a direction away from the middle portion of the first armature and are inclined in the thickness direction of the first armature. The first end and second end of the first armature are provided with extension pieces, respectively, which are bent and extended in a direction away from the middle portion and embedded in the corresponding plastic swing arms.

[0057] According to one embodiment of the present disclosure, the armature assembly further includes a second armature, the second armature is parallel to the first armature, the plastic part simultaneously covers a middle portion of the first armature and a middle portion of the second armature, and a thickness of a mold insert fitting portion at both ends of the second armature is smaller than a thickness of the main body of the second armature.

[0058] According to one embodiment of the present disclosure, the mold insert fitting portions at both ends of the second armature have a thin-walled structure.

[0059] According to one embodiment of the present disclosure, the thin-walled structure of the second armature is formed by removing a portion of material from a surface of the second armature facing away from the first armature.

[0060] According to one embodiment of the present disclosure, each thin-walled structure of the second armature is located near a middle portion of the second armature and extends across the entire width of the second armature.

[0061] According to another aspect of the present disclosure, an electromagnetic relay includes an armature assembly as described herein.

[0062] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0063] 1. In the present disclosure, the connection points between the first armature and the plastic part are used as mold insert fitting points, and the thickness of the mold insert fitting points is made thinner than the thickness of the first armature body. This structure in the present disclosure allows the armature to be locally thinned at the fitting points between the armature and the insert, controlling the tolerance to 0.04, effectively improving the problem of flash and strengthening the connection strength between the armature and the plastic part.

[0064] 2. In the present disclosure, the plastic part is provided with a plastic swing arm, which extends from the end of the plastic part in a direction away from the middle of the first armature and is inclined in the thickness direction of the first armature. Both ends of the first armature are bent outward to form extension pieces, which are embedded in the corresponding plastic swing arm. This structure of the present disclosure, on the one hand, allows the force arm of the plastic swing arm to be shortened, and because the force arm is short, the plastic swing arm is less likely to deform under the same force value. On the other hand, because the plastic swing arm encloses the extension piece of the first armature, the bonding area is increased, and because both sides of the extension piece are bonded to the plastic swing arm, the bonding force between the plastic part and the first armature is improved, and the bonding strength between the base of the plastic swing arm and the first armature can be improved. This prevents the plastic swing arm and the first armature from separating from each other when the plastic swing arm is subjected to force. At the same time, the structure is easy to mold, for example, the extension piece is embedded in the plastic part and does not affect the magnetic contact (pole face) between the armature and the yoke.

[0065] 9 to 19, the armature assembly of the present disclosure includes a first armature 1 and a plastic part 2.

[0066] The first armature 1 includes, in order along its length direction L, a first end portion 16, an intermediate portion 15, and a second end portion 17. The intermediate portion 15 of the first armature 1 has opposing first and second surfaces.

[0067] The plastic part 2 encloses therein an intermediate portion 15 of the first armature 1 , and a first end portion 16 and a second end portion 17 of the first armature 1 are exposed from the plastic part 2 .

[0068] The plastic part 2 has two plastic swing arms 21 connected to both ends thereof. The arrangement direction of the two plastic swing arms 21 coincides with the length direction L of the first armature 1. The two plastic swing arms 21 extend from both ends of the plastic part 2 in directions away from the middle part 15 of the first armature 1, and are inclined in the thickness direction of the first armature 1. The thickness direction of the first armature 1 is perpendicular to the length direction and width direction.

[0069] Mold insert fitting points are provided at the first end 16 and second end 17 of the first armature 1 where they are joined to the plastic part 2, and the mold insert fitting points are adjacent to the middle part 15 of the first armature. The thickness of the mold insert fitting points is smaller than the thickness T of the main body of the first armature 1.

[0070] In this embodiment, the first end 16 and the second end 17 of the first armature 1 have a single-sided thin-walled structure 10 at the mold insert mating position, and the thin-walled structure is formed, for example, by removing a portion of material from the first or second face of the first armature 1 along the thickness direction of the first armature.

[0071] In this embodiment, the plastic part 2 has two plastic swing arms 21. The two plastic swing arms 21 extend from both ends of the plastic part 2 along the length direction of the first armature 1 in a direction away from the middle portion 15 of the first armature 1 and are inclined in the thickness direction of the first armature 1. The first armature 1 further has extension pieces 13 bent outward from both ends, and the extension pieces 13 are embedded in the corresponding plastic swing arms 21. Specifically, the extension pieces 13 of the first armature 1 are embedded in the plastic swing arms 21 when the plastic part 2 is injection molded. Of course, the extension pieces 13 of the first armature 1 can also be embedded in the plastic swing arms 21 when the first armature 1 and the plastic part 2 are assembled. The single-sided thin-walled structure 10 of the first armature 1 is disposed on one surface in the thickness direction of the first armature 1, for example, on the first surface.

[0072] In this embodiment, as shown in FIG. 11, the single-sided thin-walled structures 10 at both ends of the first armature 1 are disposed on both sides of the first armature 1 in the width direction.

[0073] 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 covers the first armature 1 and the middle part of the second armature 3. The thickness of the mold insert fitting portions at both ends of the second armature 3 is thinner than the thickness of the main body of the second armature 3.

[0074] In this embodiment, the mold insert fitting portions at both ends of the second armature 3 are similar to the one-sided thin-walled structure 30 of the mold insert fitting portion of the first armature 1 .

[0075] In this embodiment, the single-sided thin structure 30 of the second armature 3 is disposed on the surface opposite to the surface of the single-sided thin structure 10 of the first armature 1. Specifically, as shown in Fig. 17 , the single-sided thin structure 10 of the first armature 1 faces upward, and the single-sided thin structure 30 of the second armature 3 faces downward.

[0076] In this embodiment, the single-sided thin-walled structures 30 of the second armature 3 are each disposed near the middle of the second armature 3 and extend over the entire width.

[0077] The electromagnetic relay of the present disclosure includes the armature assembly described in the above embodiments.

[0078] In the armature assembly and electromagnetic relay of the present disclosure, mold insert fitting portions are provided at both ends of the first armature 1 at the joining portions with the plastic part 2, and the thickness of the mold insert fitting portions at both ends of the first armature 1 is thinner than the thickness of the main body of the first armature 1. With this structure of the present disclosure, the armature is locally thinned at the joining portions between the armature and the insert, controlling the tolerance to 0.04, effectively improving the problem of flash and strengthening the joining strength between the armature and the plastic part.

[0079] In the armature assembly and electromagnetic relay of the present disclosure, a plastic swing arm 21 is provided on the plastic part 2, and the plastic swing arm 21 extends from an end of the plastic part 2 in a direction away from the middle part 15 of the first armature 1 and is inclined in the thickness direction of the first armature 1. Both ends of the first armature 1 further have extension pieces 13 bent outward, and the extension pieces 13 are embedded in the corresponding plastic swing arms 21. On the one hand, this structure of the present disclosure can shorten the force arm of the plastic swing arm 21, and because the force arm is short, the plastic swing arm 21 is less likely to deform under the same force value conditions. On the other hand, because the plastic swing arm 21 encases the extension piece 13 of the first armature 1, the bonding area is increased and both sides of the extension piece are bonded to the plastic swing arm, which improves the bonding force between the plastic part 2 and the first armature 1 and the bonding strength between the root of the plastic swing arm 21 and the first armature 1, making it possible to prevent the plastic swing arm 21 and the first armature 1 from separating from each other when force is applied to the plastic swing arm 21. At the same time, this structure is easy to mold and, for example, the extension piece 13 is embedded in the plastic part 2 and does not affect the magnetic contact (pole faces) between the armature and yoke.

[0080] It should be understood that the present disclosure is not limited in its application to the precise construction and arrangement of components described herein. The present disclosure may have other embodiments and may be realized and carried out in various ways. Such variations and modifications are within the scope of the present disclosure. The present disclosure as disclosed and defined herein should be understood to cover all alternative combinations of two or more individual features described or illustrated in the text and / or drawings. All of these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described herein represent the best modes known for carrying out the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. a first armature including, in longitudinal order, a first end, an intermediate portion, and a second end; a plastic part coated on a middle portion of the first armature; an intermediate portion of the first armature having a first surface and a second surface facing each other, and a rough surface structure is provided on one of the first surface and the second surface, thereby increasing a contact area between the first armature and the plastic part and strengthening a bonding force between the first armature and the plastic part; The plastic part is provided with at least one plastic swing arm, which extends from at least one of both ends of the plastic part along the length of the first armature in a direction away from the middle portion of the first armature and is inclined in the thickness direction of the first armature. A seesaw type armature assembly comprising:

2. a portion of the plastic part that contacts the rough surface structure is a joint portion; The plastic swing arm is connected to the coupling portion.

2. The seesaw armature assembly of claim 1.

3. The rough surface structure is a mesh structure.

2. The seesaw armature assembly of claim 1.

4. two of said plastic swing arms, The two plastic swing arms are disposed at opposite ends of the plastic part.

2. The seesaw armature assembly of claim 1.

5. The intermediate portion of the first armature is further provided with at least one first through hole extending through the thickness thereof; The plastic part has a filling structure that fills the first through hole.

2. The seesaw armature assembly of claim 1.

6. The cross section of the first through hole is inverted T-shaped.

6. The seesaw armature assembly of claim 5.

7. an extension piece is provided at the first end and / or the second end of the first armature; The extension piece is bent and extended in a direction away from the middle portion and is embedded in the corresponding plastic swing arm, thereby improving the bonding strength between the root portion of the plastic swing arm and the first armature and preventing the plastic swing arm from separating from the first armature when force is applied.

2. The seesaw armature assembly of claim 1.

8. The extension piece of the first armature is embedded in the corresponding plastic swing arm during injection molding of the plastic part.

8. The see-saw armature assembly of claim 7.

9. The width of the extension piece is smaller than the width of the first armature, and the thickness of the extension piece is smaller than the thickness of the first armature.

9. The see-saw armature assembly of claim 8.

10. The width of the extension piece matches the shape of the corresponding part of the plastic swing arm.

10. The see-saw armature assembly of claim 9.

11. the seesaw armature assembly further includes a second armature; the second armature is parallel to the first armature, and the plastic part simultaneously covers a middle portion of the first armature and a middle portion of the second armature; A surface of the middle portion of the second armature is provided with a rough surface structure to increase the contact area between the second armature and the plastic part and strengthen the bonding force between the second armature and the plastic part.

2. The seesaw armature assembly of claim 1.

12. the second armature is provided with at least one through hole extending through its thickness; The plastic part has a filling structure for filling the through hole.

12. The see-saw armature assembly of claim 11.

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

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