Bonding tool for multistage magnetic ring
By designing a multi-stage magnetic ring bonding fixture, the problem of stable fixing of multiple magnets in a micro motor was solved by using auxiliary fasteners, which improved the bonding quality and efficiency and simplified the operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHURUI INTELLIGENT TECH (SUZHOU) CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-12
AI Technical Summary
The traditional micro motor rotor's multi-piece bent magnet splicing structure results in poor magnetic field uniformity, complex assembly, and low heat dissipation efficiency. Furthermore, existing tooling is difficult to stably fix multiple magnetic rings, which can easily lead to adhesive misalignment or uneven adhesive layer.
Design a multi-stage magnetic ring bonding fixture. By setting auxiliary fixing parts, such as fixing nuts or pins, on the motor shaft, the glue bonding and curing of the magnet and the motor shaft can be assisted, ensuring stable fixation and uniform glue layer.
This method achieves stable bonding between the magnet and the motor shaft, reduces offset, improves bonding yield, ensures adhesive uniformity, and simplifies the operation process.
Smart Images
Figure CN224233508U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of magnetic ring-assisted bonding fixtures, specifically relating to a simple and efficient multi-stage magnetic ring bonding fixture. Background Technology
[0002] The multi-piece bent magnet splicing structure of traditional micro motor rotors results in poor magnetic field uniformity, complex assembly, and low heat dissipation efficiency.
[0003] In the process of designing a micro motor, considering the optimization of motor performance, the permanent magnet of the motor rotor structure was redesigned, changing from multiple bent magnets spliced together to an integral circular magnet. With this structure, the magnets are connected in series axially. When there are two or more magnets, the axial fixation during the curing stage of the adhesive is difficult due to the repulsion of the like magnetic poles. Existing tooling is difficult to achieve stable fixation, which can easily lead to adhesive misalignment or uneven adhesive layer.
[0004] We need to design a simple and efficient tooling to assist in the adhesive bonding and curing of the magnet and the motor shaft. Utility Model Content
[0005] The purpose of this invention is to provide a bonding fixture for multi-level magnetic rings. The auxiliary fixing component is designed to assist in the adhesive bonding and curing of the magnet and the motor shaft, solving the problem in the prior art that it is difficult to achieve stable fixing of two or more magnetic rings, which can easily lead to bonding misalignment or uneven adhesive layer.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A multi-stage magnetic ring bonding fixture includes a motor shaft, on which at least two annular magnets are fitted and bonded, with adjacent annular magnets arranged closely together; the motor shaft has a starting end and a tail end, the length from the starting end to the tail end being equal to the total length of all the annular magnets arranged closely together; an auxiliary fixing member is provided on the outer side of the tail end, the auxiliary fixing member being detachably connected to the motor shaft, and when the auxiliary fixing member is locked, the end of the auxiliary fixing member near the annular magnet abuts against the end face of the outermost annular magnet.
[0008] Optionally, the auxiliary fixing component is a fixing nut, and the outer side of the tail end is provided with an external thread that mates with the internal thread of the fixing nut.
[0009] Optionally, both the external thread and the internal thread of the fixing nut are fine-pitch threads.
[0010] Optionally, a clearance groove is provided on the inner wall of the fixing nut near the end of the annular magnet.
[0011] Optionally, the depth of the clearance groove is 1-3mm.
[0012] Optionally, the auxiliary fixing component is a pin, and the outer side of the tail end is provided with a socket that mates with the pin.
[0013] Optionally, the pin is a tapered pin.
[0014] Beneficial effects: This utility model provides a multi-level magnetic ring bonding fixture, which uses an auxiliary fixing component to assist in the adhesive bonding and curing of the magnet and the motor shaft. This solves the problem in the prior art that it is difficult to achieve stable fixing of two or more magnetic rings, which can easily lead to bonding misalignment or uneven adhesive layer. The overall structure is simple and easy to operate. Attached Figure Description
[0015] Figure 1 This is a disassembly diagram of a bonding fixture for a multi-stage magnetic ring in Example 1;
[0016] Figure 2 This is a cross-sectional view of the fixing nut in Example 1;
[0017] Figure 3 This is a disassembly diagram of a bonding fixture for a multi-stage magnetic ring in Example 2.
[0018] In the diagram: 1. Motor shaft; 11. Starting end; 12. Ending end; 2. Ring magnet; 3. Fixing nut; 4. External thread; 5. Clear slot; 6. Pin; 7. Socket. Detailed Implementation
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.
[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0021] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.
[0022] Example 1
[0023] like Figures 1-2 As shown, this embodiment provides a bonding fixture for multi-stage magnetic rings, including a motor shaft 1. At least two annular magnets 2 are sleeved and bonded on the motor shaft 1, with adjacent annular magnets 2 arranged closely together. The motor shaft 1 is provided with a starting end 11 and a tail end 12, the length from the starting end 11 to the tail end 12 being equal to the total length of all annular magnets 2 arranged closely together. An auxiliary fixing member is provided on the outer side of the tail end 12. The auxiliary fixing member is detachably connected to the motor shaft 1. When the auxiliary fixing member is locked, the end of the auxiliary fixing member near the annular magnet 2 abuts against the end face of the outermost annular magnet 2.
[0024] The "sleeving and bonding" means that the annular magnets 2 are first sleeved on the motor shaft 1 in sequence, so that the inner end of the innermost annular magnet 2 is attached to the beginning end 11 of the motor shaft 1, and the annular magnets 2 are arranged closely together. The outer end of the outermost annular magnet 2 is on the same plane as the tail end 12. Then, glue is applied for bonding. In this embodiment, epoxy AB glue is used.
[0025] The number of ring magnets 2 can be two or more, and the lengths of each ring magnet 2 can be equal or unequal.
[0026] In use, first, place the ring magnets 2 onto the motor shaft 1 one by one, so that the inner end of the innermost ring magnet 2 is attached to the beginning end 11 of the motor shaft 1, and the ring magnets 2 are arranged closely together. The outer end of the outermost ring magnet 2 is on the same plane as the tail end 12. Then apply glue for bonding, install the auxiliary fixing parts, and make the end of the auxiliary fixing parts close to the ring magnet 2 press against the end face of the outermost ring magnet 2. Wait for a period of time until it is cured, and then remove the auxiliary fixing parts.
[0027] In one optional embodiment, the auxiliary fixing component is a fixing nut 3, and the outer side of the tail end 12 is provided with an external thread 4 that mates with the internal thread of the fixing nut 3; the internal thread and the external thread 4 of the fixing nut 3 are used for fixing, and installation and disassembly are convenient; when the fixing nut 3 is tightened, the inner end face of the fixing nut 3 abuts against the end face of the outermost annular magnet 2.
[0028] Preferably, the external thread 4 and the internal thread of the fixing nut 3 are both fine threads; the high self-locking property of fine threads can counteract the repulsive force between the annular magnets 2 and ensure the stable transmission of axial clamping force; for example, an M4×0.5 nut can be selected.
[0029] To prevent glue from overflowing between the internal and external threads 4 during the tightening process, thus preventing the fixing nut 3 from being disassembled; preferably, a clearance groove 5 is provided on the inner wall of the fixing nut 3 near the annular magnet 2. Specifically, the clearance groove 5 is an empty groove provided on the inner wall of the fixing nut 3 near the annular magnet 2. Its function is to form a buffer zone for glue overflow, preventing glue from entering between the internal and external threads 4, causing thread contamination, and affecting the disassembly of the fixing nut 3.
[0030] Furthermore, the depth of the clearance groove 5 is 1-3mm; experiments show that the clearance groove 5 can accommodate an overflow glue volume ≥0.1mL, reducing the thread contamination rate to below 5%.
[0031] After adopting this tooling, the axial offset of the magnet is ≤0.02mm (the offset of traditional tooling is ≥0.1mm), and the yield rate is increased from 78% to 96%.
[0032] This embodiment provides a multi-stage magnetic ring bonding fixture. By using the cooperation of the fixing nut 3 and the external thread 4, the glue bonding and curing of the magnet and the motor shaft 1 is assisted, which solves the problem that the fixture is difficult to fix stably and is prone to bonding misalignment or uneven glue layer.
[0033] Example 2
[0034] like Figure 3 As shown, this embodiment provides a bonding fixture for multi-stage magnetic rings, including a motor shaft 1. At least two annular magnets 2 are sleeved and bonded on the motor shaft 1, with adjacent annular magnets 2 arranged closely together. The motor shaft 1 is provided with a starting end 11 and a tail end 12, the length from the starting end 11 to the tail end 12 being equal to the total length of all annular magnets 2 arranged closely together. An auxiliary fixing member is provided on the outer side of the tail end 12. The auxiliary fixing member is detachably connected to the motor shaft 1. When the auxiliary fixing member is locked, the end of the auxiliary fixing member near the annular magnet 2 abuts against the end face of the outermost annular magnet 2.
[0035] The "sleeving and bonding" means that the annular magnets 2 are first sleeved on the motor shaft 1 in sequence, so that the inner end of the innermost annular magnet 2 is attached to the beginning end 11 of the motor shaft 1, and the annular magnets 2 are arranged closely together. The outer end of the outermost annular magnet 2 is on the same plane as the tail end 12. Then, glue is applied for bonding. In this embodiment, epoxy AB glue is used.
[0036] The number of ring magnets 2 can be two or more, and the lengths of each ring magnet 2 can be equal or unequal.
[0037] In use, first, place the ring magnets 2 onto the motor shaft 1 one by one, so that the inner end of the innermost ring magnet 2 is attached to the beginning end 11 of the motor shaft 1, and the ring magnets 2 are arranged closely together. The outer end of the outermost ring magnet 2 is on the same plane as the tail end 12. Then apply glue for bonding, install the auxiliary fixing parts, and make the end of the auxiliary fixing parts close to the ring magnet 2 press against the end face of the outermost ring magnet 2. Wait for a period of time until it is cured, and then remove the auxiliary fixing parts.
[0038] In one embodiment, the auxiliary fixing component is a pin 6, and the outer side of the tail end 12 is provided with a socket 7 that cooperates with the pin 6; the pin 6 cooperates with the socket 7 to assist the glue bonding and curing of the magnet and the motor shaft 1.
[0039] Preferably, the pin 6 is a tapered pin 6; the diameter of the tapered pin 6 gradually increases. When the tapered pin 6 is inserted into the socket 7, the end of the tapered socket 7 with the larger diameter will abut against the annular magnet 2, so that a small distance is generated between the annular magnet 2 and the socket 7, forming a buffer zone for glue overflow, so as to avoid contamination of the socket 7 and affect the removal of the pin 6.
[0040] See Figure 3 The tapered pin 6 has a ring washer at the larger diameter end. When the pin 6 is inserted into the socket 7, the ring washer presses against the ring magnet 2, forming a larger buffer zone for glue overflow, which further prevents the socket 7 from being contaminated.
[0041] This embodiment provides a multi-stage magnetic ring bonding fixture. By engaging the pin 6 with the insertion hole 7, the fixture assists in the adhesive bonding and curing of the magnet and the motor shaft 1, thus solving the problems of unstable fixture fixation, which can easily lead to bonding misalignment or uneven adhesive layer.
[0042] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A bonding fixture for multi-stage magnetic rings, characterized in that, The device includes a motor shaft (1), on which at least two annular magnets (2) are fitted and bonded, with two adjacent annular magnets (2) arranged closely together; the motor shaft (1) is provided with a starting end (11) and a tail end (12), the length from the starting end (11) to the tail end (12) being equal to the total length of all the annular magnets (2) arranged closely together; an auxiliary fixing member is provided on the outside of the tail end (12), the auxiliary fixing member is detachably connected to the motor shaft (1), and when the auxiliary fixing member is locked, the end of the auxiliary fixing member near the annular magnet (2) abuts against the end face of the outermost annular magnet (2).
2. The bonding fixture for a multi-stage magnetic ring according to claim 1, characterized in that, The auxiliary fixing component is a fixing nut (3), and the outer side of the tail end (12) is provided with an external thread (4) that mates with the internal thread of the fixing nut (3).
3. The bonding fixture for a multi-stage magnetic ring according to claim 2, characterized in that, Both the external thread (4) and the internal thread of the fixing nut (3) are fine threads.
4. The bonding fixture for a multi-stage magnetic ring according to claim 2, characterized in that, The fixing nut (3) has a clearance groove (5) on the inner wall near the end of the annular magnet (2).
5. The bonding fixture for a multi-stage magnetic ring according to claim 4, characterized in that, The depth of the clearance groove (5) is 1-3mm.
6. The bonding fixture for a multi-stage magnetic ring according to claim 1, characterized in that, The auxiliary fixing component is a pin (6), and the outer side of the tail end (12) is provided with a socket (7) that cooperates with the pin (6).
7. The bonding fixture for a multi-stage magnetic ring according to claim 6, characterized in that, The pin (6) is a tapered pin.