阅读说明：本技术 一种注塑薄型步进电机以及用于该电机的连接件结构 (Injection molding thin stepping motor and connecting piece structure for same ) 是由 伍旺贤 彭光明 王磊明 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以及用于该电机的连接件结构,包括安装在转轴上的连接件,该连接件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；所述前端镂空段在连接件上形成用于替代轴套的台阶,所述连接件外圆高度与上转子铁芯,磁钢,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 connecting piece structure for the motor, which comprises a connecting piece arranged on a rotating shaft, wherein the connecting piece is provided with a front hollow section and a rear hollow section; the front-end hollow section forms a step for replacing a shaft sleeve on the connecting piece, and the height of the outer circle of the connecting piece 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 molded thin stepping motor, comprising:

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 matched with the outer ring of the rotating shaft (9);

a wave washer (6);

the motor is characterized by further comprising a connecting piece (16) arranged on the rotating shaft (9), wherein the connecting piece (16) is provided with a front-end hollow section (17) and a rear-end hollow section (18), and the wave washer (6) is arranged between the rear flange bearing (5) and the rear-end hollow section (18).

2. An injection molded thin stepping motor as claimed in claim 1, wherein said connecting member (16) is press fitted to said rotary shaft (9) by interference fit.

3. 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).

4. 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.

5. 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).

6. An injection molded thin stepping motor as claimed in claim 1, wherein the front hollow section (17) forms a step (19) on the connecting member (16) instead of the bushing (8).

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

8. An injection molding thin type stepping motor as claimed in claim 6, wherein the hollow depth of the front end hollow section (17) is L3 of the height of the shaft sleeve (8).

9. An injection molding thin type stepping motor as claimed in claim 1, wherein the height of the outer circle of the connecting piece (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).

10. A connecting piece structure for an injection molding thin stepping motor according to claim 1, characterized by comprising a connecting piece (16) arranged on a rotating shaft (9), wherein the connecting piece (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);

front end fretwork section (17) form the step that is used for replacing axle sleeve (8) on connecting piece (16), connecting piece (16) excircle height equals with last rotor core (10), magnet steel (11), the sum L5 of lower rotor core (3) three height.

Technical Field

The present disclosure relates to stepping motors, and particularly to an injection molded thin stepping motor and a connecting member 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, and the upper strata is moulded plastics end 14, stator core 15.

The rotor, the rotor contains rotor core 4 down, goes up rotor core 11, magnet steel 12, 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 rotating shaft core gear 7 to which the rotating shaft 9 belongs through interference fit.

The bearing further comprises a front end cover 13, a rear end cover 3, a front 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 greater 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 and 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 (the height of the upper rotor core 11, the height of the magnetic steel 12, and the height L5 of the lower rotor core 4 are unchanged, i.e., 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 height L12 of the magnetic steel 12, the total height L5 of the lower rotor core 4, and the height L2 of the rear flange bearing 5 are 1mm, 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 rotating shaft 9 is added with the rotating shaft iron core rail 7 to which the rotating shaft iron core rail 7 belongs, and the axial height L1 of the rotating shaft iron core rail 7 is less than the sum L5 of the heights of the upper rotor iron core 10, the magnetic steel 11 and the lower rotor iron core 3. 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 rotating shaft iron core gear 7 is less than the sum L5 of the heights of the upper rotor iron core 10, the magnetic steel 11 and the lower rotor iron core 3, the binding force between the rotating shaft iron core gear 7 and the upper rotor iron core 10 and the lower rotor iron core 3 is insufficient, and the risk that the rotor iron core falls off during the operation of the motor exists.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned disadvantages of the prior art and to provide an injection molded thin type stepping motor and a connecting member structure for the motor.

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

an injection molded thin stepper motor comprising:

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 motor further comprises a connecting piece arranged on the rotating shaft, the connecting piece 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 connecting member is press-fitted to the rotary shaft by interference fit.

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 step on the connecting piece for replacing the shaft sleeve.

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 connecting piece is equal to the sum L5 of the heights of the upper rotor iron core, the magnetic steel and the lower rotor iron core.

A connecting piece structure for the injection molding thin stepping motor comprises a connecting piece arranged on a rotating shaft, wherein the connecting piece is provided with a front hollow section and a rear hollow section, and a wave-shaped gasket is arranged between a rear flange bearing and the rear hollow section;

the front-end hollow section forms a step for replacing a shaft sleeve on the connecting piece, and the height of the outer circle of the connecting piece 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 connecting piece is adopted to replace the original rotating shaft iron core gear to which the rotating shaft belongs, the height of the outer circle of the connecting piece 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 connecting piece and the upper rotor iron core and between the connecting piece and the lower rotor iron core can be guaranteed.

2. The cost is reduced, and the step that the connecting piece belongs to has replaced the axle sleeve, has cancelled the use of axle sleeve.

Drawings

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

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic structural view of the present invention;

fig. 4 is a schematic structural view of the connector of the present invention.

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 connecting piece, 17 is a front hollow section, 18 is a rear hollow section, and 19 is a 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 motor further comprises a connecting piece 16 arranged on the rotating shaft 9, the connecting piece 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 connecting member 16 is press-fitted to the rotary shaft 9 by interference fit. 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 end cutout 17 forms a step on the connecting element 16 in place of the bushing 8. 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 connecting piece 16 has the advantage that the height of the outer circle of the connecting piece 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. The coupling force between the coupling member 16 and the upper and lower rotor cores 10 and 3 can be secured.

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.