Magnet injection molding assembly, rotor assembly and motor

Abstract

The utility model provides a magnet injection molding assembly, a rotor assembly and a motor, comprising a magnet and a shaft body, the magnet is provided with a through channel, the magnet is sleeved on the shaft body and is connected with the shaft body through an injection molding member, two end surfaces of the magnet are both provided with a first sinking groove and a second sinking groove, and the first sinking groove and the second sinking groove are communicated with each other. The first sinking groove is an annular sinking groove which is arranged in the circumferential direction and has two closed sides; one end of the second sinking groove is communicated with the first sinking groove, and the other end of the second sinking groove is communicated with the through channel of the magnet; the depth of the first sinking groove is greater than that of the second sinking groove; the first sinking groove, the second sinking groove and the position between the magnet and the shaft body are filled with the injection molding part. Due to the fact that the first sinking groove is the annular sinking groove which is arranged in the circumferential direction and is closed on the two sides and matched with the second sinking groove according to the depth design requirement, when the magnet injection molding piece rotates, radial pulling force can be exerted on the magnet, the requirement for the higher rotating speed can be met, and meanwhile the risk that the magnet ring cracks and is thrown out when the motor rotates at a high speed can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of structural improvement of a magnet injection molding component, in particular to a magnet injection molding component, a rotor component and a motor. Background Art

[0002] The magnet injection molding assembly is an important component in the motor, mainly including a magnet and a shaft. The magnet is provided with a through channel. The magnet is sleeved on the shaft and connected through an injection molding part. When the motor is running, the magnet will rotate at high speed around its center line.

[0003] However, in the prior art solution, the plastic of the magnet injection molding assembly is in the inner hole of the magnet, and there is no radial pulling force on the magnet. When the motor is running at high speed for a long time, the magnet is likely to crack and be thrown out, causing the motor to get stuck. Utility Model Content

[0004] The purpose of the utility model is to provide a magnet injection molding assembly, a rotor assembly and a motor to solve the problem that the injection molding parts in the prior art magnet injection molding assembly have no radial pulling force on the magnet and there is a risk of magnet cracking. In the magnet injection molding assembly, the magnet is sleeved on the shaft and connected by the injection molding parts. The two end faces of the magnet are provided with a first sink groove and a second sink groove. The first sink groove is a circumferentially arranged annular sink groove with closed sides; one end of the second sink groove is connected to the first sink groove, and the other end is connected to the through channel of the magnet; the depth of the first sink groove is greater than the depth of the second sink groove; the injection molding parts are filled in the first sink groove, the second sink groove, and between the magnet and the shaft. Since the first sink groove is a circumferentially arranged annular sink groove with closed sides, and the depth design requirements between the first sink groove and the second sink groove are matched, when the magnet injection molding part rotates, it will give the magnet a radial pulling force, which can meet the requirements of higher speeds, and at the same time reduce the risk of the magnetic ring cracking and being thrown out when the motor runs at high speed.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A magnet injection molding component comprises a magnet and a shaft, wherein the magnet is provided with a through channel, the magnet is sleeved on the shaft and connected through an injection molding part, and both end surfaces of the magnet are provided with a first sink groove and a second sink groove.

[0007] The first sink groove is a circumferentially arranged annular sink groove with closed two sides; one end of the second sink groove is connected to the first sink groove, and the other end is connected to the through channel of the magnet; the depth of the first sink groove is greater than the depth of the second sink groove;

[0008] The injection molded part is filled in the first sink groove, the second sink groove, and between the magnet and the shaft.

[0009] The utility model provides a magnet injection molding component, including a magnet and a shaft body, wherein the magnet is provided with a through channel, the magnet is sleeved on the shaft body and connected through an injection molding part, and the two end faces of the magnet are provided with a first sink groove and a second sink groove, wherein the first sink groove is a circumferentially arranged annular sink groove with closed sides; one end of the second sink groove is connected to the first sink groove, and the other end is connected to the through channel of the magnet; the depth of the first sink groove is greater than the depth of the second sink groove; the injection molding part is filled in the first sink groove, the second sink groove, and between the magnet and the shaft body. Since the first sink groove is a circumferentially arranged annular sink groove with closed sides, and the depth design requirements are matched, when the magnet injection molding part rotates, it will give the magnet a radial pulling force, which can meet the requirements of higher speeds, and at the same time can reduce the risk of the magnetic ring cracking and being thrown out when the motor runs at high speed.

[0010] As a preferred solution of the present utility model, the magnet is an annular structure.

[0011] As a preferred solution of the utility model, the shaft body is a plastic gear, a steel shaft or a shaft sleeve.

[0012] As a preferred solution of the present utility model, the shaft body is a gear made of plastic material, and the injection molded part and the shaft body are an integrally formed structural part.

[0013] As a preferred solution of the utility model, it is characterized in that the first sink is a special-shaped notch component.

[0014] More preferably, the first sink is a U-shaped notch member or a V-shaped notch member.

[0015] As a preferred solution of the present invention, the second sink groove is an annular sink groove arranged circumferentially.

[0016] As a preferred solution of the utility model, the second sink groove includes a plurality of groove bodies arranged at intervals along the circumference. The second sink groove can not only provide a channel for the first sink groove during injection molding, but also prevent the injection molding body from self-rotation in subsequent use after the plastic injected into the second sink groove is solidified.

[0017] Another object of the present utility model is to provide a rotor assembly including the magnet injection molding assembly.

[0018] A rotor assembly comprises a motor shaft and the above-mentioned magnet injection molding assembly arranged on the motor shaft.

[0019] Another object of the present invention is to provide a motor including the rotor assembly.

[0020] A motor comprises a stator assembly and the above-mentioned rotor assembly, wherein the rotor assembly is arranged in a cavity of the stator assembly.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0022] 1. The utility model provides a magnet injection molding component, including a magnet and a shaft body, wherein the magnet is provided with a through channel, the magnet is sleeved on the shaft body and connected by an injection molding part, and the two end faces of the magnet are provided with a first sink groove and a second sink groove, wherein the first sink groove is a circumferentially arranged annular sink groove with closed sides; one end of the second sink groove is connected to the first sink groove, and the other end is connected to the through channel of the magnet; the depth of the first sink groove is greater than the depth of the second sink groove; the injection molding part is filled in the first sink groove, the second sink groove, and between the magnet and the shaft body. Since the first sink groove is a circumferentially arranged annular sink groove with closed sides, and the depth design requirements between the first sink groove and the second sink groove are matched, when the magnet injection molding part rotates, it will give the magnet a radial pulling force, which can meet the requirements of higher speeds, and at the same time reduce the risk of the magnetic ring cracking and being thrown out when the motor runs at high speed.

[0023] 2. The utility model also provides a rotor assembly and a motor including the magnet injection molding assembly of the present application, which has simple structural improvement, does not require complicated additional control components, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the end face structure of the magnet in Example 1.

[0025] Figure 2 This is a schematic cross-sectional structural diagram of the magnet injection molding assembly in Example 1.

[0026] Figure 3 for Figure 2 Side view of the injection molded assembly of the middle magnet.

[0027] Figure 4 Schematic diagram of the end face structure of the magnet in Example 2.

[0028] Figure 5 This is a schematic cross-sectional structural diagram of the magnet injection molding assembly in Example 2.

[0029] Figure 6 Schematic diagram of the end face structure of the magnet in Example 3.

[0030] Figure 7 This is a schematic cross-sectional structural diagram of the magnet injection molding assembly in Example 3.

[0031] Icons: 1-magnet; 11-through channel; 12-first trough; 13-second trough; 131-trough body; 2-shaft body; 3-injection molded part. DETAILED DESCRIPTION

[0032] The utility model is described in detail below in conjunction with the accompanying drawings.

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] Example 1

[0035] like Figure 1-3 As shown, a magnet injection molding component is provided, including a magnet 1 and a shaft 2, wherein the magnet 1 is provided with a through channel 11, the magnet 1 is sleeved on the shaft 2 and connected through an injection molding part 3, and both end faces of the magnet 1 are provided with a first groove 12 and a second groove 13, wherein the first groove 12 is a circumferentially arranged annular groove closed on both sides, and the first groove 12 is a U-shaped notch component.

[0036] The second groove 13 is a circumferentially arranged annular groove, one end of the second groove 13 is connected to the first groove 12, and the other end is connected to the through channel 11 of the magnet 1; the depth of the first groove 12 is greater than the depth of the second groove 13; the injection molded part 3 is filled in the first groove 12, the second groove 13, and between the magnet 1 and the shaft 2, the shaft 2 is a plastic gear, and the injection molded part 3 and the shaft are an integrally formed structural part.

[0037] A rotor assembly comprises a motor shaft and the above-mentioned magnet injection molding assembly arranged on the motor shaft.

[0038] A motor comprises a stator assembly and the above-mentioned rotor assembly, wherein the rotor assembly is arranged in a cavity of the stator assembly.

[0039] Example 2

[0040] like Figure 4-5 As shown, a magnet injection molding component is provided, including a magnet 1 and a shaft body 2, wherein the shaft body 2 is a steel shaft, the magnet 1 is provided with a through channel 11, the magnet 1 is sleeved on the shaft body 2 and connected through an injection molding part 3, and the two end faces of the magnet 1 are provided with a first groove 12 and a second groove 13, wherein the first groove 12 is a circumferentially arranged annular groove closed on both sides, and the first groove 12 is a U-shaped notch component.

[0041] The second groove 13 is a circumferentially arranged annular groove, one end of the second groove 13 is connected to the first groove 12, and the other end is connected to the through channel 11 of the magnet 1; the depth of the first groove 12 is greater than the depth of the second groove 13; the injection molded part 3 is filled in the first groove 12, the second groove 13, and between the magnet 1 and the shaft 2.

[0042] A rotor assembly comprises a motor shaft and the above-mentioned magnet injection molding assembly arranged on the motor shaft.

[0043] A motor comprises a stator assembly and the above-mentioned rotor assembly, wherein the rotor assembly is arranged in a cavity of the stator assembly.

[0044] Example 3

[0045] like Figure 6-7 As shown, a magnet injection molding component is provided, including a magnet 1 and a shaft body 2, wherein the shaft body 2 is a steel shaft, the magnet 1 is provided with a through channel 11, the magnet 1 is sleeved on the shaft body 2 and connected through an injection molding part 3, and the two end faces of the magnet 1 are provided with a first groove 12 and a second groove 13, wherein the first groove 12 is a circumferentially arranged annular groove closed on both sides; the first groove 12 is a V-shaped notch component.

[0046] The second groove 13 includes a plurality of groove bodies 131 arranged at intervals along the circumferential direction, one end of the groove body 131 is connected to the first groove 12, and the other end is connected to the through channel 11 of the magnet 1; the depth of the first groove 12 is greater than the depth of the second groove 13; the injection molded part 3 is filled in the first groove 12, the second groove 13, and between the magnet 1 and the shaft 2.

[0047] A rotor assembly comprises a motor shaft and the above-mentioned magnet injection molding assembly arranged on the motor shaft.

[0048] A motor comprises a stator assembly and the above-mentioned rotor assembly, wherein the rotor assembly is arranged in a cavity of the stator assembly.

[0049] In summary, in the magnet injection molding assembly provided by the utility model, the injection molded parts are filled in the first sink groove, the second sink groove, and between the magnet and the shaft. Since the first sink groove is a circumferentially arranged annular sink groove with closed sides, and the depth design requirements between the first sink groove and the second sink groove are matched, when the magnet injection molded part rotates, it will give the magnet a radial pulling force, which can meet the requirements of higher speeds and reduce the risk of the magnetic ring cracking and being thrown out when the motor runs at high speed. The rotor assembly and motor including the magnet injection molding assembly of the present application have simple structural improvements, do not require complicated additional control components, and are easy to promote and apply.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnet injection molding assembly, comprising a magnet and a shaft, wherein the magnet is provided with a through channel, the magnet is sleeved on the shaft and connected through an injection molding part, characterized in that: The two end surfaces of the magnet are both provided with a first recessed groove and a second recessed groove. The first sink groove is a circumferentially arranged annular sink groove with closed two sides; one end of the second sink groove is connected to the first sink groove, and the other end is connected to the through channel of the magnet; the depth of the first sink groove is greater than the depth of the second sink groove; The injection molded part is filled in the first sink groove, the second sink groove, and between the magnet and the shaft.

2. The magnet injection molding component according to claim 1, characterized in that: The magnet is an annular structure.

3. The magnet injection molding component according to claim 1, characterized in that: The shaft body is a plastic gear, a steel shaft or a shaft sleeve.

4. The magnet injection molding assembly according to claim 3, characterized in that: The shaft body is a gear made of plastic, and the injection molded part and the shaft body are an integrally formed structural part.

5. The magnet injection molding assembly according to claim 1, characterized in that: The first sink is a special-shaped notch component.

6. The magnet injection molding assembly according to claim 5, characterized in that: The first sink is a U-shaped notch member or a V-shaped notch member.

7. The magnet injection molding component according to any one of claims 1 to 6, characterized in that: The second sink groove is an annular sink groove arranged circumferentially.

8. The magnet injection molding component according to any one of claims 1 to 6, characterized in that: The second sink includes a plurality of sink bodies spaced apart along the circumferential direction.

9. A rotor assembly, characterized in that: It comprises a motor shaft, and a magnet injection molding assembly as claimed in any one of claims 1 to 8 arranged on the motor shaft.

10. A motor, characterized in that: The invention comprises a stator assembly and a rotor assembly as claimed in claim 9, wherein the rotor assembly is arranged in a cavity of the stator assembly.

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