Iron core and yoke assembly, electromagnetic assembly and relay

Abstract

An iron core and yoke assembly, an electromagnetic assembly and a relay, the iron core and yoke assembly comprises an iron core and a yoke, the yoke is provided with a through assembly hole, one end, opposite to the yoke, of the iron core in the axial direction is provided with an assembly part, and the radial size of the tail end of the assembly part in the axial direction is set to be smaller than the radial size of the root end of the assembly part in the axial direction. The tail end of the assembling part is inserted into the assembling hole in the axial direction to be riveted with the assembling hole, and the root end of the assembling part is in interference fit with the assembling hole. According to the utility model, the interference fit is adopted to reduce or even eliminate the gap at the matching part of the yoke and the iron core, so that the gap of a magnetic loop is reduced or eliminated, and the magnetic attraction force is further improved.

Description

Technical Field

[0001] This utility model relates to the field of relays, and in particular to an iron core and yoke assembly, an electromagnetic assembly, and a relay. Background Technology

[0002] The existing iron core and yoke are fixed by riveting, see [link to relevant documentation]. Figure 7 and Figure 8 An assembly part 2 is provided at the tail of the iron core 1. The assembly part 2 is a cylindrical structure, and an assembly hole 4 is provided on the yoke 3. To facilitate the insertion of the iron core 1 and reduce the difficulty of production, a chamfer 5 is provided at the end of the assembly hole 4. The assembly part 2 is inserted into the assembly hole 4 and then riveted to fix it. Due to the presence of the chamfer 5, the iron core 1 and the chamfer of the assembly hole 5 cannot fit completely, resulting in a gap, which is unqualified in metallography. The presence of the gap will increase the gap in the magnetic circuit of the electromagnetic component, affecting the relay's attraction force and leading to a higher operating voltage. Utility Model Content

[0003] The main purpose of this invention is to overcome the defect of gaps in the existing riveting of iron core and yoke. It proposes an iron core and yoke assembly, electromagnetic assembly and relay, which adopts an interference fit to reduce or even eliminate the gap at the joint between the yoke and iron core, thereby reducing or eliminating the gap in the magnetic circuit and thus improving the magnetic attraction force.

[0004] The present invention adopts the following technical solution:

[0005] A core and yoke assembly includes a core and a yoke. The yoke has a through mounting hole. The core has a mounting portion at one end opposite the yoke in the axial direction. The radial dimension of the end of the mounting portion in the axial direction is set to be smaller than the radial dimension of the root end of the mounting portion in the axial direction. The end of the mounting portion is inserted into the mounting hole in the axial direction for riveting. The root end of the mounting portion is interference-fitted with the mounting hole.

[0006] Furthermore, the radial dimension of the assembly part is set to gradually decrease from the root end to the end end, the inner wall of the assembly hole opposite to the root end is interference-fitted with the assembly part, and the inner wall of the assembly hole near the end end is clearance-fitted with the assembly part to facilitate riveting.

[0007] Furthermore, the inner diameter of the assembly hole is set to be the same along the axial direction of the iron core.

[0008] Furthermore, the axial dimension of the assembly part is larger than the axial dimension of the assembly hole so that the end of the assembly part passes through the assembly hole.

[0009] Furthermore, a radially extending limiting surface is provided at the root end of the assembly part of the iron core, and the limiting surface is opposite to or in contact with the corresponding end face of the yoke.

[0010] An electromagnetic component includes a coil assembly, the coil assembly having a coil frame and a coil, the coil being wound on the coil frame, and the coil frame having an axially penetrating through hole; characterized in that it further includes the aforementioned iron core and yoke assembly, the through hole on the coil frame being coaxially arranged with the mounting hole of the yoke, and the iron core passing through the through hole axially and being fixed relative to the coil frame.

[0011] Furthermore, the yoke is divided into a first yoke and a second yoke. The first yoke is provided with mounting holes, and the second yoke is located on one side of the first yoke and extends along the core axis to form an accommodating space with the first yoke. The coil group is located in the accommodating space.

[0012] Furthermore, a radially extending limiting part is provided at the end of the iron core away from the assembly part in the axial direction; radially extending baffles are provided at both ends of the coil frame in the axial direction of the through hole, with the baffles near the assembly part closely attached to the corresponding end face of the yoke, and the baffles away from the assembly part closely attached to the corresponding end face of the limiting part.

[0013] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0014] 1. The component of this utility model reduces or even eliminates the gap between the assembly part and the assembly hole through interference fit, thereby ensuring metallographic conformity and avoiding increasing the gap in the magnetic circuit. When applied to a relay, it can also ensure the stability of the relay's suction force.

[0015] 2. In the component of this utility model, the radial dimension of the assembly part is set to gradually decrease from the root end to the end end, which facilitates insertion into the assembly hole. The inner wall of the assembly hole opposite to the root end is interference-fitted with the assembly part, and the inner wall of the assembly hole near the end end is clearance-fitted with the assembly part to facilitate riveting. This ensures that the inner wall of the assembly hole and the assembly part are interference-fitted, ensuring a stable and reliable connection.

[0016] 3. In the components of this utility model, the inner diameter of the assembly hole is set to be the same along the axial direction of the iron core, without the need for chamfering; the axial dimension of the assembly part is larger than the axial dimension of the assembly hole so that the end of the assembly part passes through the assembly hole, and the iron core is provided with a radially extending limiting surface at the root end of the assembly part. The limiting surface is opposite to or in contact with the corresponding end face of the yoke, ensuring accurate and reliable installation. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present utility model;

[0018] Figure 2 for Figure 1 Side view;

[0019] Figure 3 This is a diagram showing the fit between the iron core and the yoke;

[0020] Figure 4 This is a diagram of the iron core structure;

[0021] Figure 5 Structural diagram of the electromagnetic component of this utility model;

[0022] Figure 6 for Figure 5 A sectional view;

[0023] Figure 7 For the existing iron core structure diagram;

[0024] Figure 8 Diagram of the existing yoke structure;

[0025] in:

[0026] 10. Iron core; 11. Assembly part; 12. Limiting surface; 13. End; 14. Root end; 15. Limiting part; 20. Yoke; 21. Assembly hole; 22. First yoke; 23. Second yoke; 30. Coil group; 31. Coil; 32. Coil frame; 33. Through hole; 34. Baffle. Detailed Implementation

[0027] The present invention will be further described below through specific embodiments.

[0028] See Figures 1 to 4 A core and yoke assembly includes a core 10 and a yoke 20. The yoke 20 has a through mounting hole 21. A mounting portion 11 is provided axially at one end of the core 10 opposite the yoke 20. The radial dimensions of the two ends of the mounting portion 11 in the axial direction are different, and the radial dimension of the end 13 of the mounting portion 11 in the axial direction is smaller than the radial dimension of the root end 14 of the mounting portion 11. The end 13 of the mounting portion 11 is inserted axially into the mounting hole 21 and is fixed by riveting, for example, with a flat riveting operation. The root end 14 of the mounting portion 11 is interference-fitted with the mounting hole 21, thereby reducing or even eliminating the gap between the mounting hole 21 and the mounting portion 11.

[0029] The assembly part 11 is configured with a variable diameter structure, meaning its radial dimension gradually decreases from the root end 14 to the end end 13. The inner wall of the assembly hole 21 opposite to the root end 14 is interference-fitted with the assembly part 11, allowing for a seamless fit without extrusion deformation. The inner wall of the assembly hole 21 near the end end 13 is clearance-fitted with the assembly part 11. After riveting, the end end 13 deforms to achieve an interference fit, thus eliminating the gap between them and ensuring a seamless fit between the inner wall of the assembly hole 21 and the assembly part 11.

[0030] In this embodiment, the inner diameter of the mounting hole 21 is set to be the same along the axial direction of the iron core 10, that is, neither end of the mounting hole 21 is chamfered, to avoid gaps after riveting with the mounting part 11. The axial dimension of the mounting part 11 is larger than the axial dimension of the mounting hole 21 so that the end 13 of the mounting part 11 passes through the mounting hole 21, that is, the end 13 of the mounting part 11 is inserted from one side of the mounting hole 21 and then exits from the other side of the mounting hole 21, which facilitates the riveting operation.

[0031] In this utility model, the radial dimension of the main body of the iron core 10 is greater than the radial dimension of the assembly part 11. That is, the iron core 10 is provided with a radially extending limiting surface 12 at the root end 14 of the assembly part 11. After the assembly part 11 is riveted to the assembly hole 21, the limiting surface 12 is opposite to or in contact with the corresponding end face of the yoke 20.

[0032] Based on this, see Figure 5 and Figure 6 This utility model also proposes an electromagnetic component, including a coil assembly 30 and the aforementioned iron core and yoke assembly. The coil assembly 30 is provided with a coil frame 32 and a coil 31. The coil frame 32 is provided with an axially penetrating through hole 33. Radially extending baffles 34 are provided at both ends of the coil frame 32 in the axial direction of the through hole 33. The coil 31 is wound around the outer periphery of the coil frame 32 and located between the two baffles 34. The iron core 10 passes through the through hole 33 axially and is fixed relative to the coil frame 32. The mounting part 11 of the iron core 10 is located outside the through hole 33.

[0033] The yoke 20 is a one-piece structure, consisting of a first yoke 22 and a second yoke 23. The first yoke 22 has an assembly hole 21, and the second yoke 23 is located on one side of the first yoke 22 and bent relative to it. The second yoke 23 extends axially along the core 10 and forms a receiving space with the first yoke 22, within which the coil assembly 30 is located. The coil frame 32 is laterally arranged within the receiving space of the yoke 20, and the through hole 33 on the coil frame 32 is coaxially arranged with the assembly hole 21 on the first yoke 22, allowing the assembly part 11 of the core 10 to be inserted into the assembly hole 21.

[0034] In this embodiment, a radially extending limiting portion 15 is provided at the end of the iron core 10 away from the assembly portion 11 in the axial direction. On the coil frame 32, the baffle 34 near the assembly portion 11 is in close contact with the end face of the first yoke 22 opposite to the coil frame 32, and the baffle 34 away from the assembly portion 11 is in close contact with the end face of the limiting portion 15 opposite to the coil 31.

[0035] Based on this, the present invention also proposes a relay, which includes the aforementioned electromagnetic component and other necessary components of a relay.

[0036] In the iron core and yoke assembly, electromagnetic assembly and relay of this utility model, the gap between the assembly part 11 and the assembly hole 21 is reduced or even eliminated by the interference fit, so that the metallographic condition is qualified, and the gap of the magnetic circuit is avoided, thus ensuring the stability of the relay's suction force.

[0037] The terms "first" and "second" used in this utility model are merely for ease of description and to distinguish different components with the same name, and do not indicate a sequential or primary / secondary relationship.

[0038] In the description of this utility model, the orientation or positional relationship indicated by terms such as "up", "down", "left", "right", "front" and "back" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model.

[0039] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0040] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A core and yoke assembly, comprising a core and a yoke, wherein the yoke has a through mounting hole, and the core has an mounting portion axially opposite one end of the yoke, characterized in that: The radial dimension of the end of the assembly part in the axial direction is set to be smaller than the radial dimension of the root end of the assembly part in the axial direction. The end of the assembly part is inserted into the assembly hole in the axial direction for riveting. The root end of the assembly part is interference-fitted with the assembly hole.

2. The core and yoke assembly as described in claim 1, characterized in that, The radial dimension of the assembly part is set to gradually decrease from the root end to the end end. The inner wall of the assembly hole opposite to the root end is interference-fitted with the assembly part. The inner wall of the assembly hole near the end end is clearance-fitted with the assembly part to facilitate riveting.

3. The core and yoke assembly as described in claim 1, characterized in that, The inner diameter of the assembly hole is set to be the same along the axial direction of the iron core.

4. The core and yoke assembly as described in claim 1, characterized in that, The axial dimension of the assembly part is greater than the axial dimension of the assembly hole so that the end of the assembly part passes through the assembly hole.

5. The core and yoke assembly as described in claim 1, characterized in that, The iron core has a radially extending limiting surface at the root end of the assembly part, and the limiting surface is opposite to or in contact with the corresponding end face of the yoke.

6. An electromagnetic component, comprising a coil assembly, the coil assembly having a coil frame and a coil, the coil being wound on the coil frame, the coil frame having an axially penetrating through hole; characterized in that, It also includes a core and yoke assembly according to any one of claims 1 to 5, wherein the through hole on the coil frame is coaxially arranged with the mounting hole of the yoke, and the core passes through the through hole axially and is fixed relative to the coil frame.

7. An electromagnetic component as described in claim 6, characterized in that, The yoke is divided into a first yoke and a second yoke. The first yoke is provided with the mounting hole. The second yoke is located on one side of the first yoke and extends along the axial direction of the iron core, forming an accommodating space with the first yoke. The coil group is located within the accommodating space.

8. An electromagnetic component as described in claim 6, characterized in that, The iron core has a radially extending limiting portion at the end away from the assembly part in the axial direction; the coil frame has radially extending baffles at both ends in the axial direction of the through hole, the baffles near the assembly part are in close contact with the corresponding end face of the yoke, and the baffles away from the assembly part are in close contact with the corresponding end face of the limiting portion.

9. A relay, characterized in that, The electromagnetic component includes any one of claims 6 to 8.

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