Anti-cracking injection molded ferrite magnetic ring structure

Abstract

The utility model discloses an anti -cracking's injection molding ferrite magnetic ring structure, including the axle body, the circumference of axle body is connected with the insert piece, the circumference of insert piece is connected with the magnetic ring body, and the inside of insert piece and magnetic ring body connection one end is equipped with the first emptying cavity, and one end of first emptying cavity is equipped with the cooperation cavity, and the inside diameter of first emptying cavity is greater than the inside diameter of cooperation cavity, and the inside of magnetic ring body is equipped with the second emptying cavity with first emptying cavity inside diameter equal. The utility model insert piece and the inside of magnetic ring body connection one end are equipped with the first emptying cavity, and the inside diameter of first emptying cavity is greater than the inside diameter of cooperation cavity, and the inside of magnetic ring body is equipped with the second emptying cavity with first emptying cavity inside diameter equal, can prevent the assembly force direct transmission to the magnetic ring body, avoids causing the magnetic ring body to crack.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic ring technology, specifically relating to a crack-resistant injection-molded ferrite magnetic ring structure. Background Technology

[0002] In the electromagnetic component manufacturing industry, it is not only necessary to ensure that the magnetic properties of the products meet customer requirements, but also to make the products have a variety of special shapes or structures to meet customer assembly needs. Shaft-hole mating is one of the most common and widely used assembly methods.

[0003] In existing technologies, to prevent slippage or detachment of the shaft-hole assembly during use, an interference fit is often used to force the shaft into the hole. However, this assembly method transmits the assembly force to the magnetic ring surrounding the hole, causing the magnetic ring to crack. Utility Model Content

[0004] The purpose of this invention is to provide a crack-resistant injection-molded ferrite magnetic ring structure to solve the problems mentioned in the background art. The crack-resistant injection-molded ferrite magnetic ring structure provided by this invention has the characteristics of both meeting the shaft hole assembly requirements and preventing cracking of the magnetic ring.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a crack-resistant injection-molded ferrite magnetic ring structure, comprising a shaft, an insert connected to the circumference of the shaft, a magnetic ring connected to the circumference of the insert, a first clearance cavity provided inside the end of the insert connected to the magnetic ring, a mating cavity provided at one end of the first clearance cavity, the inner diameter of the first clearance cavity being larger than the inner diameter of the mating cavity, and a second clearance cavity provided inside the magnetic ring with the same inner diameter as the first clearance cavity.

[0006] Furthermore, the inlay is made of metal.

[0007] To ensure that there is at least a clearance of 0.15 mm between the insert and the magnetic ring and the shaft, the inner diameter of the first clearance cavity is at least 0.3 mm larger than the inner diameter of the mating cavity.

[0008] To ensure both the connection strength between the insert and the magnetic ring and to prevent cracking due to the difference in their linear thermal expansion coefficients, a connecting cavity fitted onto the circumference of the insert is provided at one end of the second cavity. The height of the magnetic ring is greater than or equal to twice the depth of the connecting cavity.

[0009] To ensure the effective length of the interference fit section and thus avoid assembly slippage, the depth of the mating cavity is further greater than or equal to the sum of the depth of the connecting cavity and the distance from the end of the mating cavity to the end face of the magnetic ring.

[0010] To prevent the pressing force of the interference fit section from being transmitted to the magnetic ring body, which could cause the assembly to crack, the distance from the end of the mating cavity to the end face of the magnetic ring body is greater than or equal to one-third of the depth of the mating cavity.

[0011] To ensure the connection strength between the magnetic ring and the insert, a limiting groove is provided on the circumference of the connection end between the insert and the magnetic ring, and a limiting protrusion corresponding to the limiting groove is provided inside the connection cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The magnetic ring and the insert of this utility model are connected by injection molding. The magnetic ring is connected to the shaft by interference fit of the insert, which ensures that no slippage occurs after assembly.

[0014] 2. The insert of this utility model has a first cavity inside the end connected to the magnetic ring body. The inner diameter of the first cavity is larger than the inner diameter of the mating cavity. The magnetic ring body has a second cavity inside the first cavity with the same inner diameter as the first cavity. This can prevent the assembly force from being directly transmitted to the magnetic ring body and avoid cracking of the magnetic ring body.

[0015] 3. The inner diameter A of the first clearance cavity of this utility model is at least 0.3mm larger than the inner diameter B of the mating cavity, ensuring that there is at least 0.15mm clearance between the insert and the magnetic ring body and the shaft body.

[0016] 4. The height D of the magnetic ring body of this utility model is greater than or equal to twice the depth C of the connecting cavity, which can not only ensure the connection strength between the insert and the magnetic ring body, but also avoid cracking caused by the difference in the linear thermal expansion coefficient between the insert and the magnetic ring body.

[0017] 5. The depth E of the mating cavity in this utility model is greater than or equal to the sum of the depth C of the connecting cavity and the distance F from the end of the mating cavity to the end face of the magnetic ring, ensuring the effective length of the interference fit section and thus avoiding assembly slippage.

[0018] 6. In this invention, the distance F from the end of the mating cavity to the end face of the magnetic ring is greater than or equal to one-third of the depth E of the mating cavity, so as to avoid the assembly pressing force of the interference fit section being transmitted to the magnetic ring, which would cause the assembly to crack.

[0019] 7. The insert and the magnetic ring body of this utility model are provided with a limiting groove on the circumference of the connection end. The connecting cavity is provided with a limiting protrusion corresponding to the limiting groove. The connection strength between the magnetic ring body and the insert is ensured by the cooperation between the limiting protrusion and the limiting groove. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the insert of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the magnetic ring of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the shaft of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the insert and the magnetic ring body of this utility model.

[0025] In the figure: 1. Shaft; 2. Insert; 21. Limiting groove; 22. First clearance cavity; 23. Mating cavity; 3. Magnetic ring; 31. Second clearance cavity; 32. Connecting cavity; 33. Limiting protrusion. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] Please see Figures 1-5 This utility model provides the following technical solution: a crack-resistant injection-molded ferrite magnetic ring structure, including a shaft 1, an insert 2 connected to the circumference of the shaft 1, the insert 2 being made of metal, preferably a copper ring, a magnetic ring body 3 connected to the circumference of the insert 2, a first clearance cavity 22 being provided inside the end where the insert 2 is connected to the magnetic ring body 3, a mating cavity 23 being provided at one end of the first clearance cavity 22, the inner diameter A of the first clearance cavity 22 being larger than the inner diameter B of the mating cavity 23, a second clearance cavity 31 being provided inside the magnetic ring body 3 with the same inner diameter as the first clearance cavity 22, the insert 2 and the magnetic ring body 3 being connected by injection molding, the insert 2 and the shaft 1 being connected by interference fit, the outer diameter G of the shaft 1 and the inner diameter B of the mating cavity 23 following the shaft-hole interference fit principle, for example, B is 14H7 and G is 14s6.

[0029] By adopting the above technical solution, the magnetic ring 3 and the insert 2 of this utility model are connected by injection molding. The magnetic ring 3 is connected to the shaft 1 by the insert 2 through an interference fit, ensuring that no slippage occurs after assembly. The insert 2 and the magnetic ring 3 are connected at one end by a first cavity 22, the inner diameter of which is larger than the inner diameter of the mating cavity 23. The magnetic ring 3 is also provided with a second cavity 31 with the same inner diameter as the first cavity 22. This prevents the assembly force from being directly transmitted to the magnetic ring 3 and avoids cracking of the magnetic ring 3.

[0030] Specifically, the inner diameter A of the first cavity 22 is at least 0.3 mm larger than the inner diameter B of the mating cavity 23.

[0031] By adopting the above technical solution, it is ensured that there is at least a clearance of 0.15mm between the insert 2 and the magnetic ring 3 and the shaft 1.

[0032] Specifically, one end of the second cavity 31 is provided with a connecting cavity 32 fitted onto the circumference of the insert 2. The height D of the magnetic ring 3 is greater than or equal to twice the depth C of the connecting cavity 32.

[0033] By adopting the above technical solution, the connection strength between the insert 2 and the magnetic ring 3 can be guaranteed, and cracking caused by the difference in linear thermal expansion coefficient between the insert 2 and the magnetic ring 3 can be avoided.

[0034] Specifically, the depth E of the mating cavity 23 is greater than or equal to the sum of the depth C of the connecting cavity 32 and the distance F from the end of the mating cavity 23 to the end face of the magnetic ring 3.

[0035] By adopting the above technical solution, the effective length of the interference fit section is guaranteed, thereby avoiding assembly slippage.

[0036] Example 2

[0037] The difference between this embodiment and embodiment 1 is that, specifically, the distance F from the end of the mating cavity 23 to the end face of the magnetic ring 3 is greater than or equal to one-third of the depth E of the mating cavity 23.

[0038] By adopting the above technical solution, the assembly pressing force of the interference fit section is prevented from being transmitted to the magnetic ring 3, thus avoiding assembly cracking.

[0039] Example 3

[0040] The difference between this embodiment and embodiment 1 is that, specifically, a limiting groove 21 is provided on the circumference of the connection end between the insert 2 and the magnetic ring 3, and a limiting protrusion 33 corresponding to the limiting groove 21 is provided inside the connecting cavity 32.

[0041] By adopting the above technical solution, the connection strength between the magnetic ring 3 and the insert 2 is ensured by the cooperation between the limiting protrusion 33 and the limiting groove 21.

[0042] In summary, the magnetic ring 3 and the insert 2 of this invention are connected by injection molding. The magnetic ring 3 is connected to the shaft 1 through an interference fit between the insert 2 and the shaft 1, ensuring that no slippage occurs after assembly. The insert 2 and the magnetic ring 3 are connected at one end by a first clearance cavity 22, the inner diameter of which is larger than the inner diameter of the mating cavity 23. The magnetic ring 3 also has a second clearance cavity 31 with the same inner diameter as the first clearance cavity 22, preventing assembly force from being directly transmitted to the magnetic ring 3 and avoiding cracking. The inner diameter A of the first clearance cavity 22 is at least 0.3 mm larger than the inner diameter B of the mating cavity 23, ensuring a clearance of at least 0.15 mm between the insert 2, the magnetic ring 3, and the shaft 1. The height D of the magnetic ring 3 of this invention is greater than or equal to twice the depth C of the connecting cavity 32. This ensures the connection strength between the insert 2 and the magnetic ring 3 while preventing cracking due to the difference in linear thermal expansion coefficients between them. The depth E of the mating cavity 23 is greater than or equal to the sum of the depth C of the connecting cavity 32 and the distance F from the end of the mating cavity 23 to the end face of the magnetic ring 3, ensuring the effective length of the interference fit section and preventing assembly slippage. The distance F from the end of the mating cavity 23 to the end face of the magnetic ring 3 is greater than or equal to one-third of the depth E of the mating cavity 23, preventing the assembly pressing force of the interference fit section from being transmitted to the magnetic ring 3, thus preventing assembly cracking. A limiting groove 21 is provided on the circumference of the connection end between the insert 2 and the magnetic ring 3. A limiting protrusion 33 corresponding to the limiting groove 21 is provided inside the connecting cavity 32. The connection strength between the magnetic ring 3 and the insert 2 is ensured by the cooperation of the limiting protrusion 33 and the limiting groove 21.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crack-resistant injection-molded ferrite magnetic ring structure, characterized in that: It includes a shaft, an insert connected to the circumference of the shaft, a magnetic ring connected to the circumference of the insert, a first clearance cavity inside the end where the insert is connected to the magnetic ring, a mating cavity at one end of the first clearance cavity, the inner diameter of the first clearance cavity being larger than the inner diameter of the mating cavity, and a second clearance cavity inside the magnetic ring having the same inner diameter as the first clearance cavity.

2. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 1, characterized in that: The insert is made of metal.

3. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 1, characterized in that: The inner diameter of the first cavity is at least 0.3 mm larger than the inner diameter of the mating cavity.

4. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 1, characterized in that: One end of the second cavity is provided with a connecting cavity fitted on the circumference of the insert.

5. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 4, characterized in that: The height of the magnetic ring is greater than or equal to twice the depth of the connecting cavity.

6. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 4, characterized in that: The depth of the mating cavity is greater than or equal to the sum of the depth of the connecting cavity and the distance from the end of the mating cavity to the end face of the magnetic ring.

7. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 1, characterized in that: The distance from the end of the mating cavity to the end face of the magnetic ring is greater than or equal to one-third of the depth of the mating cavity.

8. The crack-resistant injection-molded ferrite magnetic ring structure according to claim 4, characterized in that: The insert has a limiting groove on the circumference of the connection end with the magnetic ring, and the inside of the connection cavity has a limiting protrusion corresponding to the limiting groove.

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