阅读说明：本技术 一种注塑薄型步进电机及用于该电机的转轴结构 (Injection molding thin stepping motor and rotating shaft structure used for same ) 是由 彭光明 王磊明 伍旺贤 甘建军 李彪 于 2019-09-17 设计创作，主要内容包括：本发明涉及一种注塑薄型步进电机及用于该电机的转轴结构,该结构包括转轴铁芯档,该转轴铁芯档包括镂空形成T型台阶,该T型台阶设有前端镂空段和后端镂空段,所述波形垫圈设在后法兰轴承与后端镂空段之间；所述前端镂空段在所述转轴上形成用于替代轴套的转轴台阶,所述T型台阶的外圆高度与上转子铁芯、磁钢和下转子铁芯三者高度之和L5相等。与现有技术相比,本发明具有提高了电机性能、降低了成本等优点。(The invention relates to an injection molding thin stepping motor and a rotating shaft structure used for the same, wherein the structure comprises a rotating shaft iron core gear, the rotating shaft iron core gear comprises a hollow T-shaped step, the T-shaped step is provided with a front hollow section and a rear hollow section, and a wave washer is arranged between a rear flange bearing and the rear hollow section; the front-end hollow section forms a rotating shaft step for replacing a shaft sleeve on the rotating shaft, and the height of the excircle of the T-shaped step is equal to the sum L5 of the heights of the upper rotor iron core, the magnetic steel and the lower rotor iron core. Compared with the prior art, the invention has the advantages of improving the performance of the motor, reducing the cost and the like.)

1. An injection molding thin stepping motor comprises

The stator comprises an injection molding stator component (1), wherein the injection molding stator component (1) comprises a lower injection molding end (2), an upper injection molding end (14) and a stator iron core (15);

the rotor comprises a lower rotor iron core (4), an upper rotor iron core (11), magnetic steel (12) and a rotating shaft (9), wherein the magnetic steel (12) is arranged between the upper rotor iron core (11) and the lower rotor iron core (4);

the front end cover (13) and the rear end cover (3), wherein the outer rings of the front end cover (13) and the rear end cover (3) are pressed into the inner ring of the injection molding stator assembly (1) through interference fit;

the front flange bearing (10) and the rear flange bearing (5), the outer ring of the front flange bearing (10) is matched with the inner ring of the front end cover (13), the outer ring of the rear flange bearing (5) is matched with the inner ring of the rear end cover (3), and the inner rings of the front flange bearing (10) and the rear flange bearing (5) are respectively matched with the outer ring of the rotating shaft (9);

a wave washer (6);

the novel bearing is characterized in that the rotating shaft (9) is provided with a rotating shaft iron core gear (7), the rotating shaft iron core gear (7) comprises a hollow T-shaped step (16), the T-shaped step (16) is provided with a front hollow section (17) and a rear hollow section (18), and the wave washer (6) is arranged between the rear flange bearing (5) and the rear hollow section (18).

2. An injection molded thin stepping motor as claimed in claim 1, wherein the hollow diameter of the rear hollow section (18) is larger than the flange outer diameter of the rear flange bearing (5).

3. An injection molded thin stepping motor as claimed in claim 1, wherein the hollow of the rear hollow section (18) is a wave washer (6) with a required height L4.

4. An injection molded thin stepping motor as claimed in claim 1, wherein the hollow outer diameter of the front hollow section (17) is larger than the flange outer diameter of the front flange bearing (10).

5. An injection molded thin stepping motor as claimed in claim 1, wherein the front hollow section (17) forms a shaft step (19) on the shaft (9) instead of the shaft sleeve (8).

6. An injection molding thin type stepping motor as claimed in claim 5, wherein the hollow inner diameter of the front end hollow section (17) is the outer diameter of the shaft sleeve (8).

7. An injection molding thin type stepping motor as claimed in claim 5, wherein the hollow depth of the front end hollow section (17) is L3 of the height of the shaft sleeve (8).

8. An injection molding thin type stepping motor as claimed in claim 1, wherein the height of the outer circle of the T-shaped step (16) is equal to the sum L5 of the heights of the upper rotor core (10), the magnetic steel (11) and the lower rotor core (3).

9. A rotating shaft structure for an injection molding thin stepping motor according to claim 1, characterized by comprising a rotating shaft iron core rail (7), wherein the rotating shaft iron core rail (7) comprises a hollow-out T-shaped step (16), the T-shaped step (16) is provided with a front hollow-out section (17) and a rear hollow-out section (18), and the wave washer (6) is arranged between the rear flange bearing (5) and the rear hollow-out section (18);

front end fretwork section (17) are in form pivot step (19) that are used for replacing axle sleeve (8) on pivot (9), the excircle height of T type step (16) equals with the sum L5 of going up rotor core (10), magnet steel (11) and rotor core (3) three height down.

Technical Field

The invention relates to a stepping motor, in particular to an injection molding thin stepping motor and a rotating shaft structure for the same.

Background

As shown in fig. 1, a conventional injection molding thin type stepping motor includes:

the stator, the stator contains injection molding stator module 1, stator module 1 contains the lower floor and moulds plastics end 2, upper strata and mould plastics end 14 and stator core 15.

The rotor, the rotor contains rotor core 4 down, last rotor core 11, magnet steel 12 and pivot 9. The magnetic steel 12 is arranged between the upper rotor core 11 and the lower rotor core 4, and the upper rotor core 11 and the inner ring of the lower rotor core 4 are pressed on the iron core gear 7 to which the rotating shaft 9 belongs through interference fit.

In addition, the stepping motor also comprises a front end cover 13, a rear end cover 3, a flange bearing 10, a rear flange bearing 5, a shaft sleeve 8 and a wave washer 6. The front end cover 13 and the outer ring of the rear end cover 3 are pressed into the inner ring of the injection molding stator assembly 1 through interference fit. The front flange bearing 10 and the rear flange bearing 5 are matched with the front end cover 13 and the rear end cover 3, and the front flange bearing 10 and the rear flange bearing 5 are matched with the rotating shaft 9. The shaft sleeve 8 is arranged between the rear flange bearing 5 and the rotating shaft iron core rail 7 to which the rotating shaft 9 belongs. The wave washer 6 is arranged between the rear flange bearing 5 and a rotating shaft iron core rail 7 to which the rotating shaft 9 belongs.

The height of the injection molding stator assembly 1 is defined as L, the height of a rotating shaft iron core rail 7 to which the rotating shaft 9 belongs is defined as L1, the heights of the front flange bearing 10 and the rear flange bearing 5 are defined as L2, the height of the shaft sleeve 8 is defined as L3, the required height of the wave washer 6 is defined as L4, and the heights of the upper rotor iron core 11, the lower rotor iron core 4 and the magnetic steel 12 are defined as L5.

Theoretically, the height L of the injection molding stator assembly 1 is not less than or equal to (the height L2 of the front flange bearing 10 + the required height L4 of the wave washer 6 + the height of the upper rotor core 11, the magnetic steel 12, the lower rotor core 4, the height L5+ the shaft sleeve thickness L3+ the height L2 of the rear flange bearing 5). In some cases, if the height L of the injection-molded stator assembly 1 is 8mm, and the motor performance is guaranteed to be unchanged (i.e., L5 is 4 mm), and the height L2 of the front flange bearing 5 and the rear flange bearing 10 is 2.5mm (the thinnest flange bearing in the market) is unchanged, the height L of the injection-molded stator assembly 1, the height L2 of the front flange bearing 10, the height L2 of the upper rotor core 11, the magnetic steel 12, the lower rotor core 4L 5, and the height L2 of the rear flange bearing 5 are-1 mm, and the motor has no space for placing the wave washer 6 and the shaft sleeve 8. In this case, in order to ensure that there is enough axial space required for placing the shaft sleeve 8 and the wave washer 6, the shaft core rail 7 to which the shaft sleeve belongs is added on the rotating shaft 9, and the axial height L1 of the shaft core rail 7 is less than L5. And the upper rotor core 10 and the inner ring of the lower rotor core 3 are pressed on the rotating shaft core gear 7 to which the rotating shaft 9 belongs through interference fit.

Since the height L1 of the rotary shaft iron core rail 7 is less than L5, there is a risk that the binding force between the rotary shaft step 7 and the upper rotor iron core 10 and the lower rotor iron core 3 is insufficient and the rotor iron core falls off when the motor is in operation.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide an injection molded thin type stepping motor and a rotating shaft structure for the motor.

The purpose of the invention can be realized by the following technical scheme:

an injection molding thin stepping motor comprises

The stator comprises an injection molding stator component, and the injection molding stator component comprises a lower injection molding end, an upper injection molding end and a stator core;

the rotor comprises a lower rotor core, an upper rotor core, magnetic steel and a rotating shaft, wherein the magnetic steel is arranged between the upper rotor core and the lower rotor core;

the front end cover and the rear end cover are pressed into the inner ring of the injection molding stator component through interference fit;

the front flange bearing outer ring is matched with the front end cover inner ring, and the rear flange bearing outer ring is matched with the rear end cover inner ring; the front flange bearing, the rear flange bearing and the inner ring are matched with the outer ring of the rotating shaft;

a wave washer;

the rotating shaft is provided with a rotating shaft iron core baffle, the rotating shaft iron core baffle comprises a hollow T-shaped step, the T-shaped step is provided with a front end hollow section and a rear end hollow section, and the wave washer is arranged between the rear flange bearing and the rear end hollow section.

Preferably, the hollow diameter of the rear end hollow section is larger than the flange outer diameter of the rear flange bearing.

Preferably, the hollow of the rear hollow section is a height L4 required by the wave washer.

Preferably, the hollowed-out outer diameter of the front end hollowed-out section is larger than the outer diameter of the flange of the front flange bearing.

Preferably, the front hollow section forms a rotating shaft step for replacing a shaft sleeve on the rotating shaft

Preferably, the hollow inner diameter of the front hollow section is the outer diameter of the shaft sleeve.

Preferably, the hollow depth of the front hollow section is the height L3 of the shaft sleeve.

Preferably, the height of the outer circle of the T-shaped step is equal to the sum L5 of the heights of the upper rotor core, the magnetic steel and the lower rotor core.

A rotating shaft structure for the injection molding thin stepping motor of claim 1 comprises a rotating shaft iron core gear, wherein the rotating shaft iron core gear comprises a hollow T-shaped step, the T-shaped step is provided with a front hollow section and a rear hollow section, and the wave washer is arranged between a rear flange bearing and the rear hollow section;

the front-end hollow section forms a rotating shaft step for replacing a shaft sleeve on the rotating shaft, and the height of the excircle of the T-shaped step is equal to the sum L5 of the heights of the upper rotor iron core, the magnetic steel and the lower rotor iron core.

Compared with the prior art, the invention has the following advantages:

1) the motor performance is improved, the T-shaped steps are adopted to replace the original rotating shaft iron core gear to which the rotating shaft belongs, the height of the outer circle of the steps can be effectively guaranteed to be equal to the sum of the heights of the upper rotor iron core, the magnetic steel and the lower rotor iron core, and the binding force between the steps and the upper rotor iron core and the lower rotor iron core can be guaranteed.

2) The cost is reduced, and the step of the rotating shaft on the rotating shaft replaces the shaft sleeve, so that the use of the shaft sleeve is eliminated.

Drawings

FIG. 1 is a schematic structural diagram of a conventional injection molded thin stepping motor;

FIG. 2 is a partially enlarged schematic view of FIG. 1;

FIG. 3 is a schematic structural diagram of an injection molded thin stepping motor according to the present invention;

FIG. 4 is a partially enlarged schematic view of FIG. 3;

wherein, 1 is an injection molding stator component, 2 is a lower layer injection molding end, 3 is a rear end cover, 4 is a lower rotor iron core, 5 is a rear flange bearing, 6 is a wave washer, 7 is a rotating shaft iron core gear, 8 is a shaft sleeve, 9 is a rotating shaft, 10 is a front flange bearing, 11 is an upper rotor iron core, 12 is magnetic steel, 13 is a front end cover, 14 is an upper layer injection molding end, and 15 is a stator iron core;

l is the height of an injection molding stator component, L1 is the height of a rotating shaft iron core block, L2 is the height of a flange bearing, L3 is the height of a shaft sleeve, L4 is the height required by a wave washer, L5 is the sum of the heights of an upper rotor iron core, a lower rotor iron core and magnetic steel;

16 is a T-shaped step, 17 is a front hollow section, 18 is a rear hollow section, and 19 is a rotating shaft step.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

As shown in FIG. 3, an injection molded thin type stepping motor comprises

The stator comprises an injection molding stator component 1, wherein the injection molding stator component 1 comprises a lower injection molding end 2, an upper injection molding end 14 and a stator core 15;

the rotor comprises a lower rotor iron core 4, an upper rotor iron core 11, magnetic steel 12 and a rotating shaft 9, wherein the magnetic steel 12 is arranged between the upper rotor iron core 11 and the lower rotor iron core 4;

the front end cover 13 and the rear end cover 3 are pressed into the inner ring of the injection molding stator assembly 1 through interference fit;

the front flange bearing 10 and the rear flange bearing 5, the outer ring of the front flange bearing 10 is matched with the inner ring of the front end cover 13, the outer ring of the rear flange bearing 5 is matched with the inner ring of the rear end cover 3, and the inner rings of the front flange bearing 10 and the rear flange bearing 5 are matched with the outer ring of the rotating shaft 9;

a wave washer 6;

the rotating shaft 9 is provided with a rotating shaft iron core rail 7, the rotating shaft iron core rail 7 comprises a T-shaped step 16 formed by hollowing out, the T-shaped step 16 is provided with a front hollow section 17 and a rear hollow section 18, and the wave washer 6 is arranged between the rear flange bearing 5 and the rear hollow section 18.

The hollow diameter of the rear end hollow section 18 is larger than the flange outer diameter of the rear flange bearing 5. The hollow of the rear hollow section 18 is a height L4 required by the wave washer 6.

The hollow-out outer diameter of the front end hollow-out section 17 is larger than the flange outer diameter of the front flange bearing 10. The front hollow section 17 forms a rotating shaft step 19 for replacing the shaft sleeve 8 on the rotating shaft 9, and the use of the shaft sleeve is eliminated. The hollow inner diameter of the front end hollow section 17 is the outer diameter of the shaft sleeve 8. The hollow depth of the front hollow section 17 is the height L3 of the shaft sleeve 8.

The T-shaped step 16 has the advantage that the height of the outer circle of the T-shaped step 16 is equal to the sum L5 of the heights of the upper rotor core 10, the magnetic steel 11 and the lower rotor core 3, so that the binding force between the T-shaped step 16 and the upper rotor core 10 and the lower rotor core 3 can be ensured.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.