Connection structure between movable contact and base and electromagnetic relay
The connection structure for a movable contact and base in electromagnetic relays addresses positioning accuracy and clamp reliability issues by using a thin-walled and stepped design, ensuring precise fitting and alignment while maintaining electrical and thermal performance.
Patent Information
- Application Number
- JP2025549432
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-03-02
- Filing Date
- 2024-02-22
- Publication Date
- 2026-02-19
AI Technical Summary
Conventional connection structures between a movable contact and a base in magnetic retention relays suffer from variations in material thickness, leading to excessive loosening or overtightening, compromising positioning accuracy and clamp reliability.
A connection structure featuring a movable contactor pull-out piece with a thin-walled structure and a positioning rib, along with a step structure and inclined surface, to ensure precise fitting and alignment, reducing material thickness variations and improving clamp reliability.
The proposed structure enhances positioning accuracy and clamp reliability by minimizing material thickness variations, maintaining current carrying and heat dissipation effects, and facilitating easier assembly with reduced shavings.
Smart Images
Figure 2026505910000001_ABST
Abstract
Description
[Technical Field]
[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This disclosure claims priority to Chinese Patent Application No. 202310192972.4, filed on Mar. 2, 2023, the entire contents of which are incorporated herein by reference.
[0002] The present disclosure relates to the field of relay technology, and more particularly to a connection structure between a movable contact and a base, and an electromagnetic relay. [Background technology]
[0003] A magnetic retention relay generally consists of a magnetic circuit system, a contact system, a push mechanism, and a base. The magnetic circuit system generally consists of two essentially symmetrical magnetic circuits, including a fixed magnetic conductor part, a movable magnetic conductor part, and a coil. The contact system includes a movable contact part and a fixed contact part, and the push mechanism mainly includes a push card. When a positive pulse voltage is applied to the relay coil, the magnetic circuit system operates, and the push card pushes the movable contact part, bringing the movable contact of the movable contact part into contact with the fixed contact of the fixed contact part, thereby operating the relay. When a reverse pulse voltage is applied to the coil, the magnetic circuit system operates, and the push card pushes the movable contact part, separating the movable contact of the movable contact part from the fixed contact of the fixed contact part, thereby resetting the relay.
[0004] In a conventional connection structure between a movable contact and a base of a magnetic retention relay, when the movable contact is fitted into the slot of the base, a rib on the base serves as a positioning reference surface and abuts against the first end of the movable contact lead piece. A protrusion is provided on the other side of the slot, along the thickness of the movable contact lead piece, and the movable contact lead piece is tightly fitted into the slot of the base via this protrusion. This structure avoids cumulative tolerances caused by multiple parts and improves the positioning accuracy of the movable contact lead piece. However, due to variations in the thickness of metal parts, this structure can cause excessive loosening or overtightening in actual use, making it impossible to guarantee positioning accuracy. Summary of the Invention
[0005] The present disclosure aims to overcome the drawbacks of the prior art and provide a movable contactor-base connection structure and an electromagnetic relay, which provide a thin-walled structure at the position where the movable contactor pull-out piece needs to be positioned, thereby reducing variations in the material thickness of the movable contactor pull-out piece, improving clamp reliability, and ultimately improving the positioning accuracy of the movable contactor pull-out piece. According to one aspect of the present disclosure, there is provided a connection structure for a movable contactor and a base, the movable contactor comprising a movable contact piece and a movable contactor pull-out piece, a first end of the movable contact piece being connected to a movable contact, a second end of the movable contact piece being fixedly connected to the first end of the movable contactor pull-out piece, the movable contact piece and the movable contactor pull-out piece forming a V-shape, the second end of the movable contactor pull-out piece being set as a pull-out connection part, the base being provided with a slot, the first end of the movable contactor pull-out piece being provided with a thin-walled structure extending outward, the thin-walled structure being fitted into the slot of the base, the slot of the base being provided with a positioning rib, the positioning rib abutting one side of the thin-walled structure, the side being the side of the movable contactor pull-out piece facing the movable contact piece, the thin-walled structure can reduce variations in material thickness of the movable contactor pull-out piece and improve clamp reliability.
[0006] According to one embodiment of the present disclosure, the movable contactor pull-out piece and the thin-walled structure each have an upper surface and a lower surface, the movable contactor pull-out piece is connected to the lower surface of the movable contactor pull-out piece, the upper surface of the thin-walled structure and the upper surface of the movable contactor pull-out piece are flush with each other, and the lower surface of the thin-walled structure is higher than the lower surface of the movable contactor pull-out piece.
[0007] According to one embodiment of the present disclosure, the slot of the base is provided with a protrusion for an interference fit, and the protrusion and the positioning rib are respectively disposed on two opposite sides of the slot.
[0008] According to one embodiment of the present disclosure, a step structure is further provided at the first end of the movable contactor pull-out piece, and the step structure and the thin-walled structure are respectively arranged on both sides of the connection portion between the movable contactor pull-out piece and the movable contactor pull-out piece, and the second end of the movable contactor abuts against the step structure.
[0009] According to an embodiment of the present disclosure, the step structure includes an upper step and a lower step, and the heights of the upper step and the lower step are the same. According to an embodiment of the present disclosure, the insertion portion of the slot of the base is further provided with an inclined surface for guiding the insertion of the movable contact pull-out piece.
[0010] According to one embodiment of the present disclosure, the movable contact pull-out piece is bent into a substantially L-shape.
[0011] According to one embodiment of the present disclosure, the movable contact piece has a U-shaped portion, which is located between the connection position of the movable contact piece and the movable contactor pull-out piece and the fixed position of the movable contact of the movable contact piece, and the opening of the U-shaped portion faces the movable contactor pull-out piece.
[0012] According to one embodiment of the present disclosure, the movable contact piece is formed by stacking a plurality of spring pieces.
[0013] According to another aspect of the present disclosure, an electromagnetic relay includes the connection structure of the movable contact and the base described herein.
[0014] Compared with the prior art, the beneficial effects of the present disclosure are as follows:
[0015] 1. In the present disclosure, the first end of the movable contactor pull-out piece is fitted into a slot in the base at the outer end of the connection portion with the second end of the movable contactor pull-out piece, and a positioning rib is provided in the slot in the base, and the positioning rib abuts against one side of the outer end of the first end of the movable contactor pull-out piece, which side faces the movable contactor pull-out piece of the movable contactor pull-out piece. The outer end of the first end of the movable contactor pull-out piece is provided with a thin-walled structure extending outward, which reduces variations in the material thickness of the movable contactor pull-out piece and improves the reliability of the clamp. With this structure of the present disclosure, the movable contactor pull-out piece and the base are fitted together via the slot and the positioning rib provided in the slot, and by thinning the local locations where the movable contactor pull-out piece needs to be positioned, it is possible to reduce variations in the material thickness of the movable contactor pull-out piece and improve the reliability of the clamp. Furthermore, the thin-walled structure does not have a movable contact piece, so the current does not pass through the thin-walled structure but flows directly from the connection between the movable contact piece and the movable contact lead piece. This arrangement only thins localized locations, eliminating the need to thin the entire movable contact lead piece 12. This ensures the material thickness of the movable contact lead piece itself, without affecting the current carrying effect or heat dissipation effect, and further reduces variation, improving the mating accuracy between the base and lead piece.
[0016] 2. Furthermore, in the present disclosure, a step structure is further provided at the first end of the movable contact piece, and the second end of the movable contact piece abuts against the step structure. This structure of the present disclosure allows the movable contact piece to perform a fan-shaped movement with the step structure as a fulcrum when moving up and down. Without the step structure, the fulcrum would move as the fan-shaped movement occurs, which could change the reaction force of the movable contact piece. With the step structure, the fulcrum is fixed and does not change. With the step, the moving fulcrum of the movable contact piece is fixed and the dispersion of the reaction force of the movable contact piece is small, so the force with which the reaction force of the movable contact piece is transmitted to the end of the movable contact piece is relatively uniform, further improving the positioning accuracy of the base and the movable contact piece.
[0017] 3. Furthermore, in the present disclosure, an inclined surface is further provided at the insertion portion of the slot of the base. With this structure of the present disclosure, the movable contact is automatically aligned during pre-assembly, making assembly easier and effectively preventing the generation of shavings. [Brief explanation of the drawings]
[0018] The above and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. [Figure 1] FIG. 1 is a front view of a movable contactor pull-out piece in an embodiment of a connection structure of a movable contactor and a base according to the present disclosure. [Figure 2] FIG. 2 is an enlarged schematic view of A in FIG. [Figure 3] FIG. 3 is a front view of the movable contactor pull-out piece and the movable contact piece in the embodiment of the connection structure of the movable contactor and the base according to the present disclosure when they are connected. [Figure 4] FIG. 4 is an enlarged schematic view of B in FIG. [Figure 5] FIG. 5 is a schematic diagram showing a partial structure of an electromagnetic relay according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is an enlarged schematic view of C in FIG. DETAILED DESCRIPTION OF THE INVENTION
[0019] 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 "above" would become the component located "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.
[0020] 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.
[0021] As shown in Fig. 3, the connection structure between a movable contactor and a base disclosed in the present disclosure comprises a movable contactor 1 and a base 2. The movable contactor comprises a movable contact piece 11 and a movable contactor pull-out piece 12, and a first end of the movable contact piece 11 (the right end of the movable contact piece 11 in Fig. 3) is connected to a movable contact 13, and a second end of the movable contact piece 11 (the left end of the movable contact piece 11 in Fig. 3) and a first end of the movable contactor pull-out piece 12 (the left end of the movable contactor pull-out piece 12 in Fig. 3) are fixedly connected, and the movable contactor pull-out piece 12 and the movable contactor pull-out piece 11 are connected to form a V-shape. The second end of the movable contactor pull-out piece 12 is referred to as a pull-out connection part 121.
[0022] As shown in Figures 5 and 6, a slot 21 is provided in the base 2, and the first end of the movable contactor pull-out piece 12 is fitted into the slot 21 of the base 2. A positioning rib 211 is provided in the slot 21 of the base 2, and the positioning rib 211 abuts against the outer surface of the first end of the movable contactor pull-out piece 12, i.e., the surface of the movable contactor pull-out piece 12 facing the movable contactor pull-out piece 11. A thin-walled structure 122 extending outward is provided at the first end of the movable contactor pull-out piece 12, and the thin-walled structure 122 reduces variations in the material thickness of the movable contactor pull-out piece and improves the reliability of the clamp.
[0023] The movable contactor pull-out piece 12 and the thin-walled structure 122 each have an upper surface and a lower surface, and the movable contactor pull-out piece 11 is connected to the lower surface of the movable contactor pull-out piece 12. The upper surface of the thin-walled structure 122 and the upper surface of the movable contactor pull-out piece 12 are flush with each other, and the lower surface of the thin-walled structure 122 is higher than the lower surface of the movable contactor pull-out piece 12.
[0024] 6, in this embodiment, the slot 21 of the base 2 is provided with a protrusion 212 for tight fitting, and the protrusion 212 and the positioning rib 211 are arranged on two opposing side surfaces of the slot 21, i.e., on both sides of the thin-walled structure 122 of the movable contact pull-out piece 12. The thin-walled structure 122 is inserted into the slot 21 and is clamped and fixed by the protrusion 212 and the positioning rib 211.
[0025] 4, in this embodiment, a step structure 123 is further provided at the first end of the movable contactor pull-out piece 12, and the step structure 123 and the thin-walled structure 122 are respectively arranged on both sides of the connection portion between the movable contactor pull-out piece 12 and the movable contact piece 11. The second end of the movable contact piece 11 abuts against the step structure 123.
[0026] In this embodiment, the step structure 123 includes an upper step and a lower step, and the heights of the upper step and the lower step are the same.
[0027] As shown in Figure 6, in this embodiment, an inclined surface is further provided at the insertion portion of the slot 21 of the base 2, that is, the positioning rib 211 and the protrusion 212 are respectively provided with inclined surfaces 2111 and 2121 that guide the insertion of the movable contact pull-out piece.
[0028] 1 to 4, in this embodiment, the movable contactor pull-out piece 12 is bent into a substantially L-shape between a first end and a second end. A connecting protrusion 124 is also provided at the first end of the movable contactor pull-out piece 12, and the connecting protrusion 124 is disposed between the stepped structure 123 and the thin-walled structure 122. The second end of the movable contactor pull-out piece 11 and the connecting protrusion 124 of the movable contactor pull-out piece 12 are fixedly connected by caulking.
[0029] As shown in Figure 3, in this embodiment, the movable contact piece 11 has a U-shaped portion 113, which is located between the connection position of the movable contact piece 11 and the movable contactor pull-out piece 12 and the fixed position of the movable contact 13, and the opening of the U-shaped portion 113 faces the movable contactor pull-out piece 12.
[0030] As shown in FIG. 4, in this embodiment, the movable contact piece 11 is formed by stacking a plurality of spring pieces.
[0031] The electromagnetic relay disclosed in this disclosure includes the movable contact and base connection structure described in the above embodiment. It also includes a fixed contact 31, a fixed contact 32, a magnetic circuit portion 4, a push card 5, and an armature assembly 6. The first armature, the second armature, and the permanent magnet of the armature assembly 6 are combined into an I-shaped integrated part via a plastic part. The yoke 41 of the magnetic circuit portion 4 fits into openings on both sides of the I-shaped structure of the armature assembly 6. The fixed contact 32 is fixed to a first end of the fixed contact 31, and the second end of the fixed contact 31 typically extends outside the relay housing as a drawn-out portion. The second end of the movable contact lead piece 12 also extends outside the relay housing as a drawn-out portion, and the movable contact 13 and the fixed contact 32 are in corresponding positions. The armature assembly 6 is mated with a first end of the push card 5 via a plastic push arm 61 , and the second end of the push card 5 is mated with the movable contact piece 11 .
[0032] In the movable contactor-base connection structure and electromagnetic relay disclosed herein, the first end of the movable contactor pull-out piece 12 is fitted into a slot 21 in the base 2 at the connection portion with the second end of the movable contactor pull-out piece 11, and a positioning rib 211 is provided in the slot 21 in the base 2, which abuts against one side of the first end of the movable contactor pull-out piece 12, the side facing the movable contactor pull-out piece 11 of the movable contactor pull-out piece 12. The first end of the movable contactor pull-out piece 12 is provided with a thin-walled structure 122 extending outward, which reduces variations in the material thickness of the movable contactor pull-out piece and improves clamping reliability. With this structure disclosed herein, the movable contactor pull-out piece is fitted into the base via the slot and the positioning rib, and local locations where the movable contactor pull-out piece needs to be positioned are made thinner, thereby reducing variations in the material thickness of the movable contactor pull-out piece and improving clamping reliability. Furthermore, because the extended thin-walled structures are arranged alternately with the movable contact pieces, the current does not pass through the thin-walled structures but flows directly from the connection between the movable contact piece and the movable contact lead piece. This arrangement makes the thickness thin only in localized locations, eliminating the need to thin the entire movable contact lead piece 12, ensuring the material thickness of the movable contact lead piece itself, without affecting the current carrying effect or heat dissipation effect, and further reducing variation, thereby improving the mating accuracy between the base and the movable contact lead piece.
[0033] The present disclosure discloses a connection structure between a movable contact and a base, and an electromagnetic relay. A step structure 123 is further provided at the first end of the movable contact lead piece 12, with the upper and lower steps of the step structure 123 having the same height, and the second end of the movable contact piece 11 abutting against the step structure 123. This structure of the present disclosure allows the movable contact piece to perform a fan-shaped movement with the step structure as a fulcrum when moving up and down. Without the step structure, the fulcrum would move with the fan-shaped movement, potentially changing the reaction force of the movable contact piece. With the step structure, the fulcrum is fixed and does not change. With the step, the moving fulcrum of the movable contact piece is fixed, and the dispersion of the reaction force of the movable contact piece is small, so the force of the reaction force of the movable contact piece is transmitted to the end of the movable contact lead piece relatively uniformly, further improving the positioning accuracy of the base and the movable contact lead piece.
[0034] The connection structure between the movable contact and the base and the electromagnetic relay disclosed in the present disclosure further include an inclined surface at the insertion portion of the slot 21 of the base 2. This structure of the present disclosure allows the movable contact to be automatically aligned during pre-assembly, making assembly easier and effectively preventing the generation of shavings.
[0035] 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. The foregoing 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 several 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 connection structure between a movable contact and a base, The movable contactor comprises a movable contact piece and a movable contact lead piece, a first end of the movable contact piece is connected to a movable contact, a second end of the movable contact piece and the first end of the movable contact lead piece are fixedly connected, the movable contact piece and the movable contact lead piece form a V-shape, the second end of the movable contact lead piece is set as a lead connection part, and a slot is provided in the base; a first end of the movable contact lead piece is provided with a thin-walled structure extending outward, the thin-walled structure is fitted into the slot of the base, the slot of the base is provided with a positioning rib, the positioning rib abuts against one side of the thin-walled structure, the side being a side of the movable contact lead piece facing the movable contact piece; This thin-walled structure reduces variations in the material thickness of the movable contact lead piece, improving the reliability of the clamp. A connection structure between a movable contact and a base.
2. The movable contact lead piece and the thin-walled structure each have an upper surface and a lower surface, the movable contact piece is connected to the lower surface of the movable contact lead piece, the upper surface of the thin-walled structure and the upper surface of the movable contact lead piece are flush with each other, and the lower surface of the thin-walled structure is higher than the lower surface of the movable contact lead piece.
2. The connection structure of a movable contact and a base according to claim 1.
3. The slot of the base is provided with a protrusion for a tight fit, and the protrusion and the positioning rib are respectively disposed on two opposing sides of the slot.
2. The connection structure of a movable contact and a base according to claim 1.
4. A step structure is further provided at the first end of the movable contactor pull-out piece, and the step structure and the thin-walled structure are respectively arranged on both sides of the connection portion between the movable contactor pull-out piece and the movable contactor pull-out piece, and the second end of the movable contactor abuts against the step structure.
2. The connection structure of a movable contact and a base according to claim 1.
5. The step structure has an upper step and a lower step, and the heights of the upper step and the lower step are the same.
5. The connection structure of a movable contact and a base according to claim 4.
6. The insertion portion of the slot of the base is further provided with an inclined surface for guiding the insertion of the movable contact lead piece.
4. The connection structure of a movable contact and a base according to claim 1.
7. The movable contact lead piece is bent into a substantially L-shape.
2. The connection structure of a movable contact and a base according to claim 1.
8. The movable contact piece has a U-shaped portion, which is located between a connection position of the movable contact piece and the movable contact lead piece and a fixed position of the movable contact of the movable contact piece, and an opening of the U-shaped portion faces the movable contact lead piece.
2. The connection structure of a movable contact and a base according to claim 1.
9. The movable contact piece is formed by stacking a plurality of spring pieces.
9. The connection structure of a movable contact and a base according to claim 8.
10. A movable contactor and a base connection structure according to any one of claims 1 to 9 is provided. Electromagnetic relay characterized by: