CN215221926U - Assembly structure of annular magnet and plastic guide sleeve - Google Patents
Assembly structure of annular magnet and plastic guide sleeve Download PDFInfo
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- CN215221926U CN215221926U CN202022855619.4U CN202022855619U CN215221926U CN 215221926 U CN215221926 U CN 215221926U CN 202022855619 U CN202022855619 U CN 202022855619U CN 215221926 U CN215221926 U CN 215221926U
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- guide sleeve
- plastic guide
- salient pole
- motor shaft
- ring
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Abstract
The utility model discloses an assembly structure of a ring-shaped magnet and a plastic guide sleeve, which comprises a ring-shaped magnet, a plastic guide sleeve and a motor shaft, wherein the plastic guide sleeve is sleeved on the motor shaft in an interference manner, the front end surface of the plastic guide sleeve is provided with a ring-shaped cavity, the front end surface of the plastic guide sleeve is coaxially provided with a sleeve section, the ring-shaped magnet is sleeved on the sleeve section, the ring-shaped cavity contains a main body of the ring-shaped magnet, the side wall of the ring-shaped cavity is provided with a plurality of mounting grooves in a penetrating manner, the number of the mounting grooves is 2N, n is an integer, the mounting grooves are uniformly distributed along the circumferential direction of the plastic guide sleeve, correspondingly, 2N salient pole structures are arranged on the outer edge of the annular magnet and matched with one mounting groove, the salient pole structures are in interference fit with the mounting grooves, the width of each salient pole structure is A mm, the outer diameter of the plastic guide sleeve is B mm, A is less than B, and A is more than or equal to B/3. The width of the salient pole structure is set so that the salient pole structure has enough bending strength to avoid the breakage.
Description
Technical Field
The utility model relates to a motor shaft detection area especially relates to an assembly structure of annular magnet and plastics uide bushing.
Background
The ring magnet is a component mounted on the shaft of a motor and used to send signals to the hall element to measure the motor speed and determine the rotor position and direction of rotation.
The prior annular magnet is generally combined with a plastic guide sleeve and pressed and fastened on a motor shaft, and the common methods comprise the following steps:
the method comprises the following steps: the annular magnet and the plastic guide sleeve are in interference fit with the mounting groove through a salient pole structure, and the plastic guide sleeve is pressed into the motor shaft in an interference fit manner to achieve the fastening purpose;
the second method comprises the following steps: the annular magnet is used as an insert and is integrally injected with the plastic guide sleeve to be pressed into the motor shaft in an interference manner;
the third method comprises the following steps: the annular magnet is arranged in the plastic guide sleeve, and the plastic guide sleeve is pressed into the motor shaft in an interference manner.
In practical production, the above methods have the following defects respectively:
the method comprises the following steps: the width of the salient pole structure is small, and the root of the salient pole structure is easy to break in the process of pressing the salient pole structure into the mounting groove (realizing interference fit);
the second method comprises the following steps: the process of the injection molding of the annular magnet as the insert and the plastic guide sleeve is complex and has high cost;
the third method comprises the following steps: the abnormal conditions such as neglected loading and damage are not easy to observe.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide an assembly structure of annular magnet and plastic guide sleeve, which can optimize the process of assembling the annular magnet on the shaft of the motor, and has lower cost.
The purpose of the utility model is realized by adopting the following technical scheme:
an assembly structure of a ring-shaped magnet and a plastic guide sleeve comprises the ring-shaped magnet, the plastic guide sleeve and a motor shaft, wherein the plastic guide sleeve is sleeved on the motor shaft in an interference manner, a ring-shaped cavity is arranged on the front end face of the plastic guide sleeve, a sleeve section is coaxially arranged on the front end face of the plastic guide sleeve, the ring-shaped magnet is sleeved on the sleeve section, the ring-shaped cavity contains a main body of the ring-shaped magnet, a plurality of installation grooves are penetratingly arranged on the side wall of the ring-shaped cavity, the number of the installation grooves is 2N, N is an integer, the installation grooves are uniformly distributed along the circumferential direction of the plastic guide sleeve, correspondingly, 2N salient pole structures are arranged on the outer edge of the ring-shaped magnet, each salient pole structure is matched with one installation groove, the salient pole structures are matched with the interference installation grooves in an interference manner, and the width of the salient pole structures is A millimeter, the outer diameter of the plastic guide sleeve is B millimeters, wherein A is less than B, and A is more than or equal to B/3.
Specifically, the mounting groove and the salient pole structure each extend in a radial direction.
Specifically, the diameter of the motor shaft is E millimeters, and the outer diameter of the sleeve section is F millimeters, wherein E is less than F and less than B.
Specifically, a plurality of ribs are punched on the outer wall of the motor shaft, and the plurality of ribs are embedded into the inner wall of the plastic guide sleeve so as to realize that the plastic guide sleeve is sleeved on the motor shaft in an interference manner.
Specifically, the ribs extend in the axial direction, and the ribs are uniformly distributed in the circumferential direction.
Specifically, the axial length of rib is C millimeter, the circumference length of plastics uide bushing is D millimeter, wherein, C < D.
Specifically, the ribs radially exceed the outer wall of the motor shaft by 0.02mm-0.1 mm.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses annular magnet does with the assembly process of the assembly structure of plastics uide bushing:
firstly, punching ribs on a motor shaft, pressing a commutator (not shown) into a preset position of the motor shaft, then assembling the annular magnet and the plastic guide sleeve in place as required (the salient pole structure is in interference fit with the mounting groove), and finally pressing an assembly of the annular magnet and the plastic guide sleeve into the motor shaft after the ribs are punched (the plastic guide sleeve is in interference fit with the motor shaft), so that the plastic guide sleeve and the motor shaft are fixedly connected.
The width of the salient pole structure is A mm, the outer diameter of the plastic guide sleeve is B mm, A is less than B, A is more than or equal to B/3, the width of the salient pole structure is enough, when the salient pole structure is pressed into the mounting groove, the salient pole structure can bear bending stress, and the width of the salient pole structure enables the salient pole structure to have enough bending strength, so that breakage is avoided.
Drawings
Fig. 1 is a side view of the assembly structure of the ring magnet and the plastic guide sleeve of the present invention;
FIG. 2 is a half-sectional view of the assembly structure of the ring magnet and the plastic guide sleeve of the present invention;
FIG. 3 is a ring magnet provided with four salient pole structures;
FIG. 4 is a ring magnet provided with six salient pole structures;
FIG. 5 is a ring magnet provided with two salient pole structures;
fig. 6 shows another size of ring magnet provided with two salient pole structures.
In the figure: 1. a plastic guide sleeve; 11. a sleeve segment; 2. ribs; 3. a ring magnet; 31. a salient pole structure; 4. a motor shaft.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Referring to fig. 1 to 2, an assembly structure of a ring magnet and a plastic guide sleeve comprises a ring magnet 3, a plastic guide sleeve 1 and a motor shaft 4, wherein the plastic guide sleeve 1 is sleeved on the motor shaft 4 in an interference manner. The front end face of the plastic guide sleeve 1 is provided with an annular cavity, and the front end face of the plastic guide sleeve 1 is coaxially provided with a sleeve section 11. The sleeve section 11 is located to the cover of annular magnet 3, and annular cavity holds annular magnet 3's main part. The lateral wall of cyclic annular cavity is equipped with a plurality of mounting grooves with running through, and the quantity of mounting groove is 2N, and wherein N is the integer. The mounting grooves are uniformly distributed along the circumferential direction of the plastic guide sleeve 1, and accordingly, the outer edge of the ring magnet 3 is provided with 2N salient pole structures 31, each salient pole structure 31 being matched to one mounting groove. The ring magnet 3 shown in fig. 3 and 4 is fitted into four mounting grooves and six mounting grooves, respectively. The salient pole structures 31 are in interference fit with the mounting grooves, the width of each salient pole structure 31 is A mm, the outer diameter of each plastic guide sleeve 1 is B mm, A is less than B, A is more than or equal to B/3, and two annular magnets 3 with different widths of the salient pole structures 31 are shown in FIGS. 5 and 6.
Specifically, the mounting groove and the salient pole structure 31 each extend in the radial direction.
Specifically, the diameter of the motor shaft 4 is E mm, and the outer diameter of the sleeve segment 11 is F mm, where E < F < B.
Specifically, a plurality of ribs 2 are punched on the outer wall of the motor shaft 4, and the plurality of ribs 2 are embedded into the inner wall of the plastic guide sleeve 1 so as to realize that the plastic guide sleeve 1 is sleeved on the motor shaft 4 in an interference manner.
Specifically, the ribs 2 extend in the axial direction, and the ribs 2 are uniformly distributed in the circumferential direction.
Specifically, the axial length of the rib 2 is C mm, and the circumferential length of the plastic guide sleeve 1 is D mm, wherein C is less than D.
Specifically, the ribs 2 radially exceed the outer wall of the motor shaft 4 by 0.02mm to 0.1 mm.
The utility model discloses annular magnet does with the assembly process of the assembly structure of plastics uide bushing:
firstly, punching ribs 2 on a motor shaft 4, pressing a commutator (not shown) into a preset position of the motor shaft 4, then assembling the annular magnet 3 and the plastic guide sleeve 1 in place according to requirements (the salient pole structure 31 is in interference fit with the mounting groove), and finally pressing an assembly body of the annular magnet 3 and the plastic guide sleeve 1 into the motor shaft 4 after the ribs 2 (so that the plastic guide sleeve 1 is in interference fit with the motor shaft 4), and fixedly connecting the plastic guide sleeve 1 and the motor shaft 4.
The width of the salient pole structure 31 is A mm, the outer diameter of the plastic guide sleeve 1 is B mm, A is less than B, A is more than or equal to B/3, the width of the salient pole structure 31 is enough, when the salient pole structure 31 is pressed into the mounting groove, the salient pole structure 31 can bear bending stress, and the width of the salient pole structure 31 is set to enable the salient pole structure 31 to have enough bending strength and avoid breaking.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (7)
1. The utility model provides an assembly structure of annular magnet and plastics uide bushing which characterized in that: the motor shaft is sleeved with the plastic guide sleeve in an interference manner, an annular cavity is arranged on the front end face of the plastic guide sleeve, a sleeve section is coaxially arranged on the front end face of the plastic guide sleeve, the annular magnet is sleeved on the sleeve section, the annular cavity contains a main body of the annular magnet, a plurality of mounting grooves are penetratingly arranged on the side wall of the annular cavity, the number of the mounting grooves is 2N, N is an integer, the mounting grooves are uniformly distributed along the circumferential direction of the plastic guide sleeve, correspondingly, 2N salient pole structures are arranged on the outer edge of the annular magnet, each salient pole structure is matched with one mounting groove, the salient pole structures are in interference fit with the mounting grooves, the width of each salient pole structure is A millimeter, and the outer diameter of the plastic guide sleeve is B millimeter, wherein A is less than B, and A is more than or equal to B/3.
2. The assembly structure of a ring magnet and a plastic guide sleeve according to claim 1, wherein: the mounting groove and the salient pole structure extend in the radial direction.
3. The assembly structure of a ring magnet and a plastic guide sleeve according to claim 1, wherein: the diameter of the motor shaft is E mm, the outer diameter of the sleeve section is F mm, wherein E is more than F and less than B.
4. The assembly structure of a ring magnet and a plastic guide sleeve according to claim 1, wherein: the motor shaft is characterized in that a plurality of ribs are punched on the outer wall of the motor shaft and embedded into the inner wall of the plastic guide sleeve, so that the plastic guide sleeve is sleeved on the motor shaft in an interference manner.
5. The assembly structure of a ring magnet and a plastic guide sleeve according to claim 4, wherein: the ribs extend along the axial direction and are uniformly distributed along the circumferential direction.
6. The structure of assembling a ring magnet and a plastic guide bush according to claim 5, wherein: the axial length of rib is C millimeter, the circumference length of plastics uide bushing is D millimeter, wherein, C < D.
7. The structure of assembling a ring magnet and a plastic guide bush according to claim 5, wherein: the ribs radially exceed the outer wall of the motor shaft by 0.02mm-0.1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022855619.4U CN215221926U (en) | 2020-12-01 | 2020-12-01 | Assembly structure of annular magnet and plastic guide sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022855619.4U CN215221926U (en) | 2020-12-01 | 2020-12-01 | Assembly structure of annular magnet and plastic guide sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215221926U true CN215221926U (en) | 2021-12-17 |
Family
ID=79417129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022855619.4U Active CN215221926U (en) | 2020-12-01 | 2020-12-01 | Assembly structure of annular magnet and plastic guide sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215221926U (en) |
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2020
- 2020-12-01 CN CN202022855619.4U patent/CN215221926U/en active Active
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