Assembly method of external rotor motor

Abstract

The invention discloses an assembling method of an external rotor motor, which comprises the following steps of: firstly, processing a main shaft body with the length of L1, and respectively reserving extrusion forming sections at the positions of a stator blocking part and a lower bearing blocking part of the main shaft body; then the upper part of the main shaft body is extruded by a pier pressing die, so that the extrusion forming section at the position of the stator blocking part protrudes outwards to form the stator blocking part which is integrally formed with the main shaft body; then the lower portion of the main shaft body is extruded through an upsetting die, so that the extrusion forming section at the position of the lower bearing blocking part protrudes outwards, the lower bearing blocking part integrally formed with the main shaft body is formed, the length of the upset main shaft body is L2, L2 is the required standard length, L2 is smaller than L1, and L1 is larger than L2; therefore, the external rotor motor assembled by adopting the assembling method has the characteristics of stable and reliable structure and few assembling steps.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an assembly method for an outer rotor motor.

Background Art

[0002] At present, a snap ring or other blocking structures are usually adopted for the main shaft of a motor to prevent components such as a stator assembly and a bearing from axially moving upward or downward along the main shaft. However, since the snap ring supports the stator assembly and the bearing for a long time, it is easy for the snap ring to become loose or deformed, affecting the stability of the stator assembly, the bearing and the main shaft, resulting in structural instability and insecurity problems between the stator assembly, the bearing and the main shaft; in addition, there are also problems of many assembly steps and poor structural stability.

[0003] In addition, for the above structure using a snap ring, an installation groove for installing the snap ring needs to be provided on the main shaft, that is, it is necessary to ensure that the assembly requirements of the installation groove and the snap ring are relatively high, which has the characteristics of high production and processing difficulty and difficult assembly.

[0004] Therefore, the present invention is studied and proposed in view of the above problems.

Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an assembly method for an outer rotor motor. The outer rotor motor assembled by using this assembly method has the characteristics of stable and reliable structure and few assembly steps.

[0006] The present invention is realized by the following technical solutions:

[0007] A main shaft of an outer rotor motor includes a main shaft body 1. The main shaft body 1 successively has an upper bearing installation section 11, an upper bearing blocking section 12, a stator installation section 13, a stator blocking section 14, a lower bearing blocking section 15 and a lower bearing installation section 16 from top to bottom. The stator blocking section 14 and the lower bearing blocking section 15 are spaced apart, and an interval section 17 is formed therebetween;

[0008] The upper bearing installation section 11 is used for installing an upper bearing 111;

[0009] The upper bearing blocking section 12 is used for installing a snap ring 121 to block and limit the axial downward movement of the upper bearing 111;

[0010] The stator installation section 13 is used for fixedly installing and connecting with a stator assembly 2;

[0011] The stator blocking section 14 is integrally formed with the main shaft body 1 by being extruded outward by a mold during the upsetting process of the main shaft body 1. The stator blocking section 14 is used for blocking and limiting the axial downward movement of the stator assembly 2;

[0012] The lower bearing installation section 16 is used for installing the lower bearing 161;

[0013] The lower bearing blocking portion 15 is integrally formed with the main shaft body 1 by being extruded outward by a mold during the upsetting process of the main shaft body 1, and the lower bearing blocking portion 15 is used to block and limit the upward axial movement of the lower bearing 161.

[0014] As described above for an outer-rotor motor main shaft, the main shaft body 1 is provided with an extrusion forming section 18 at the position of the stator blocking portion 14 for facilitating the outward protrusion to form the stator blocking portion 14, and the main shaft body 1 is provided with an extrusion forming section 18 at the position of the lower bearing blocking portion 15 for facilitating the outward protrusion to form the lower bearing blocking portion 15.

[0015] As described above for an outer-rotor motor main shaft, the upper bearing installation section 11 has an interference fit with the inner ring of the upper bearing 111, and the lower bearing installation section 16 has an interference fit with the inner ring of the lower bearing 161.

[0016] As described above for an outer-rotor motor main shaft, the outer wall of the stator installation section 13 is provided with a plurality of stator installation stripes 131 arranged at circumferential intervals, and the stator assembly 2 is in interference fit with the stator installation section 13 through the stator installation stripes 131.

[0017] As described above for an outer-rotor motor main shaft, the upper bearing blocking portion 12 and the stator installation section 13 are spaced apart to form a spacing section 17.

[0018] As described above for an outer-rotor motor main shaft, the main shaft body 1 is provided with a hollow setting.

[0019] An outer-rotor motor of the present invention includes a stator assembly 2, a rotor assembly 3, and an outer-rotor motor main shaft as described above. The stator assembly 2 is fixedly installed on the stator installation section 13, and the lower end of the stator assembly 2 is in blocking cooperation with the stator blocking portion 14. The lower bearing installation section 16 is installed with a lower bearing 161, the upper end of the inner ring of the lower bearing 161 is in blocking cooperation with the lower bearing blocking portion 15. The upper bearing installation section 11 is installed with an upper bearing 111, the lower end of the inner ring of the upper bearing 111 is in blocking cooperation with a snap ring 121 installed on the upper bearing blocking portion 12, and the upper and lower parts of the rotor assembly 3 are fixedly connected to the outer rings of the upper bearing 111 and the lower bearing 161 respectively.

[0020] As described above for an outer-rotor motor, the rotor assembly 3 includes an upper rotor housing 31 connected to the outer ring of the upper bearing 111 and a lower rotor housing 32 connected to the outer ring of the lower bearing 161, and the upper rotor housing 31 and the lower rotor housing 32 are detachably connected.

[0021] The present invention also provides an assembly method for an outer rotor motor. The outer rotor motor includes a stator assembly 2, a rotor assembly 3, and a main shaft body 1. The main shaft body 1 successively has an upper bearing mounting section 11, an upper bearing blocking portion 12, a stator mounting section 13, a stator blocking portion 14, a lower bearing blocking portion 15, and a lower bearing mounting section 16 from top to bottom. The stator blocking portion 14 and the lower bearing blocking portion 15 are spaced apart, and an interval section 17 is formed therebetween. At the position of the stator blocking portion 14 on the main shaft body 1, there is an extrusion forming section 18 that facilitates outward protrusion to form the stator blocking portion 14. At the position of the lower bearing blocking portion 15 on the main shaft body 1, there is an extrusion forming section 18 that facilitates outward protrusion to form the lower bearing blocking portion 15.

[0022] The upper bearing mounting section 11 is used for mounting an upper bearing 111.

[0023] The upper bearing blocking portion 12 is used for mounting a snap ring 121 to block and limit the axial downward movement of the upper bearing 111.

[0024] The stator mounting section 13 is used for fixedly mounting and connecting with the stator assembly 2.

[0025] The stator blocking portion 14 is integrally formed with the main shaft body 1 by outward protrusion through die extrusion during the upsetting process of the main shaft body 1. The stator blocking portion 14 is used to block and limit the axial downward movement of the stator assembly 2.

[0026] The lower bearing mounting section 16 is used for mounting a lower bearing 161.

[0027] The lower bearing blocking portion 15 is integrally formed with the main shaft body 1 by outward protrusion through die extrusion during the upsetting process of the main shaft body 1. The lower bearing blocking portion 15 is used to block and limit the axial upward movement of the lower bearing 161.

[0028] The assembly method includes the following steps:

[0029] S1. Machine a main shaft body 1 with a length of L1, so that extrusion forming sections 18 are respectively reserved at the positions of the stator blocking portion 14 and the lower bearing blocking portion 15 of the main shaft body 1.

[0030] S2. Extrude the upper part of the main shaft body 1 through an upsetting die so that the extrusion forming section 18 at the position of the stator blocking portion 14 protrudes outward to form a stator blocking portion 14 integrally formed with the main shaft body 1. Then, extrude the lower part of the main shaft body 1 through the upsetting die so that the extrusion forming section 18 at the position of the lower bearing blocking portion 15 protrudes outward to form a lower bearing blocking portion 15 integrally formed with the main shaft body 1, making the length of the upset main shaft body 1 be L2, where L2 is the required standard length and L2 < L1.

[0031] S3. Sheath the stator assembly 2 from top to bottom on the stator mounting section 13 so that the lower end of the stator assembly 2 is in blocking cooperation with the stator blocking portion 14. Sheath the lower bearing 161 from bottom to top on the lower bearing mounting section 16 so that the upper end of the inner ring of the lower bearing 161 is in blocking cooperation with the lower bearing blocking portion 15. Then, snap the circlip 121 onto the upper bearing blocking portion 12. After that, sheath the upper bearing 111 from top to bottom on the upper bearing mounting section 11 so that the lower end of the inner ring of the upper bearing 111 is in blocking cooperation with the circlip 121. Finally, connect the stator assembly 2 to the outer rings of both the lower bearing 161 and the upper bearing 111.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. In the present invention, the stator blocking portion is integrally formed with the main shaft body by extrusion through a mold during the upsetting process of the main shaft body, and the lower bearing blocking portion is integrally formed with the main shaft body by extrusion through a mold during the upsetting process of the main shaft body. This can effectively prevent the stator assembly from moving downward relative to the main shaft body and the lower bearing from moving upward relative to the main shaft body, making the connection between the stator assembly, the lower bearing and the main shaft body more firm and reliable and the structure more stable. It can also effectively improve production efficiency and structural strength. In addition, the stator blocking portion and the lower bearing blocking portion are spaced apart, and there is a spaced section between them, which can facilitate the installation of the stator assembly and prevent interference between the stator assembly and the lower bearing, thus affecting the performance of the motor.

[0034] 2. For the convenience of upsetting and forming, the main shaft body has an extrusion forming section.

[0035] 3. The present invention replaces the structure of using a circlip for blocking in the prior art with the stator blocking portion and the lower bearing blocking portion, featuring a stable structure and fewer assembly steps.

[0036] 4. The outer rotor motor assembled by the assembly method of the present invention features a stable and reliable structure and high assembly efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following further elaborates on the specific embodiments of the present invention in conjunction with the drawings, where:

[0038] Figure 1 is a three-dimensional structure diagram of the motor in the present invention.

[0039] Figure 2 is a sectional structure diagram of the motor in the present invention.

[0040] Figure 3 is a three-dimensional structure diagram of the main shaft in the present invention.

[0041] Figure 4 is a sectional structure diagram of the main shaft in the present invention.

[0042] Figure 5 For Figure 4 The enlarged schematic diagram of A in

[0043] Figure 6 This is a schematic cross-sectional structure diagram when the stator blocking portion and the lower bearing blocking portion are not pressed out on the main shaft in the present invention.

[0044] Figure 7 This is a schematic cross-sectional structure diagram of the assembly jig for assembling the stator assembly and the main shaft in the present invention.

Specific Embodiment

[0045] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0046] As Figures 1-7 shown, a main shaft of an outer-rotor motor according to the present invention includes a main shaft body 1, and the main shaft body 1 sequentially has an upper bearing installation section 11, an upper bearing blocking section 12, a stator installation section 13, a stator blocking section 14, a lower bearing blocking section 15, and a lower bearing installation section 16 from top to bottom. The stator blocking section 14 and the lower bearing blocking section 15 are spaced apart, and an interval section 17 is formed therebetween;

[0047] The upper bearing installation section 11 is used for installing the upper bearing 111;

[0048] The upper bearing blocking section 12 is used for installing a snap ring 121 to block and limit the axial downward movement of the upper bearing 111;

[0049] The stator installation section 13 is used for fixedly installing and connecting with the stator assembly 2;

[0050] The stator blocking section 14 is integrally formed with the main shaft body 1 by being extruded outward by a mold during the pressing process of the main shaft body 1, and the stator blocking section 14 is used for blocking and limiting the axial downward movement of the stator assembly 2;

[0051] The lower bearing installation section 16 is used for installing the lower bearing 161;

[0052] The lower bearing blocking portion 15 is integrally formed with the main shaft body 1 by being extruded outward by a mold during the upsetting process of the main shaft body 1. The lower bearing blocking portion 15 is used to block and limit the upward axial movement of the lower bearing 161. In the present invention, the stator blocking portion is integrally formed with the main shaft body by being extruded outward by a mold during the upsetting process, and the lower bearing blocking portion is integrally formed with the main shaft body by being extruded outward by a mold during the upsetting process, which can effectively prevent the stator assembly from moving downward relative to the main shaft body and the lower bearing from moving upward relative to the main shaft body, making the connection between the stator assembly, the lower bearing and the main shaft body more firm and reliable and the structure more stable, and can also effectively improve the production efficiency and structural strength; in addition, the stator blocking portion and the lower bearing blocking portion are arranged at intervals, and an interval section is formed therebetween, which can facilitate the installation of the stator assembly and avoid interference between the stator assembly and the lower bearing, thus affecting the motor performance.

[0053] As Figure 6 shown, for the convenience of upsetting and forming, the main shaft body 1 is provided with an extrusion forming section 18 at the position of the stator blocking portion 14 to facilitate the outward protrusion and forming of the stator blocking portion 14, and the main shaft body 1 is provided with an extrusion forming section 18 at the position of the lower bearing blocking portion 15 to facilitate the outward protrusion and forming of the lower bearing blocking portion 15.

[0054] The upper bearing installation section 11 is in interference fit with the inner ring of the upper bearing 111, and the lower bearing installation section 16 is in interference fit with the inner ring of the lower bearing 161, which can ensure that the bearing does not loosen due to vibration or impact during operation, improve stability, and at the same time improve the bearing capacity of the bearing. In addition, it can also reduce the vibration and noise of the bearing during operation and improve the mechanical precision.

[0055] The outer wall of the stator installation section 13 is provided with a plurality of stator installation stripes 131 arranged at circumferential intervals. The stator assembly 2 is in interference fit with the stator installation section 13 through the stator installation stripes 131, which can improve the reliability and stability of the connection structure and reduce the number of components.

[0056] As Figures 2-4 shown, the upper bearing blocking portion 12 and the stator installation section 13 are arranged at intervals to form an interval section 17, which can facilitate the installation of the stator assembly and avoid interference between the stator assembly and the upper bearing, thus affecting the motor performance.

[0057] In order to reduce the weight of the main shaft body, lower the production cost and facilitate wiring, the main shaft body 1 is provided with a hollow structure.

[0058] As Figures 1-6As shown in the figure, an outer-rotor motor of the present invention includes a stator assembly 2, a rotor assembly 3, and an outer-rotor motor main shaft as described above. The stator assembly 2 is fixedly installed on the stator installation section 13, and the lower end of the stator assembly 2 is in blocking cooperation with the stator blocking portion 14. The lower bearing installation section 16 is installed with a lower bearing 161, and the upper end of the inner ring of the lower bearing 161 is in blocking cooperation with the lower bearing blocking portion 15. The upper bearing installation section 11 is installed with an upper bearing 111, and the lower end of the inner ring of the upper bearing 111 is in blocking cooperation with a snap ring 121 installed on the upper bearing blocking portion 12. The upper and lower parts of the rotor assembly 3 are fixedly connected to the outer rings of the upper bearing 111 and the lower bearing 161 respectively. The outer-rotor motor of the present invention has the characteristics of stable and reliable structure and high assembly efficiency.

[0059] For convenient disassembly and assembly, the rotor assembly 3 includes an upper rotor housing 31 connected to the outer ring of the upper bearing 111 and a lower rotor housing 32 connected to the outer ring of the lower bearing 161, and the upper rotor housing 31 and the lower rotor housing 32 are detachably connected.

[0060] As Figure 7 shown in the figure, the stator assembly 2 is positioned in the positioning recess at the upper end of the assembly jig. Then, the main shaft body is passed through the stator hole of the stator assembly 2. Finally, a pushing member such as an assembly cylinder presses the main shaft body until the stator installation section of the main shaft body is in interference fit with the stator hole.

[0061] An assembly method of an outer-rotor motor of the present invention, the outer-rotor motor includes a stator assembly 2, a rotor assembly 3, and a main shaft body 1. The main shaft body 1 sequentially has an upper bearing installation section 11, an upper bearing blocking portion 12, a stator installation section 13, a stator blocking portion 14, a lower bearing blocking portion 15, and a lower bearing installation section 16 from top to bottom. The stator blocking portion 14 and the lower bearing blocking portion 15 are spaced apart, and an interval section 17 is formed therebetween. The main shaft body 1 is provided with an extrusion forming section 18 at the position of the stator blocking portion 14 to facilitate the outward protrusion to form the stator blocking portion 14, and the main shaft body 1 is provided with an extrusion forming section 18 at the position of the lower bearing blocking portion 15 to facilitate the outward protrusion to form the lower bearing blocking portion 15;

[0062] The upper bearing installation section 11 is used for installing the upper bearing 111;

[0063] The upper bearing blocking portion 12 is used for installing a snap ring 121 to block and limit the axial downward movement of the upper bearing 111;

[0064] The stator installation section 13 is used for fixedly installing and connecting with the stator assembly 2;

[0065] The stator blocking portion 14 is integrally formed with the main shaft body 1 by outward protrusion through die extrusion during the upsetting process of the main shaft body 1, and the stator blocking portion 14 is used to block and limit the axial downward movement of the stator assembly 2;

[0066] The lower bearing mounting section 16 is used to mount the lower bearing 161;

[0067] The lower bearing blocking portion 15 is integrally formed with the main shaft body 1 by outward protrusion through die extrusion during the upsetting process of the main shaft body 1, and the lower bearing blocking portion 15 is used to block and limit the axial upward movement of the lower bearing 161;

[0068] The assembly method includes the following steps:

[0069] S1. Machine the main shaft body 1 with a length of L1, so that extrusion forming sections 18 are respectively reserved at the positions of the stator blocking portion 14 and the lower bearing blocking portion 15 of the main shaft body 1;

[0070] S2. Extrude the upper part of the main shaft body 1 through an upsetting die so that the extrusion forming section 18 at the position of the stator blocking portion 14 protrudes outward to form the stator blocking portion 14 integrally formed with the main shaft body 1. Then, extrude the lower part of the main shaft body 1 through the upsetting die so that the extrusion forming section 18 at the position of the lower bearing blocking portion 15 protrudes outward to form the lower bearing blocking portion 15 integrally formed with the main shaft body 1, so that the length of the upset main shaft body 1 is L2, L2 is the required standard length, and L2 < L1;

[0071] S3. Sleeve the stator assembly 2 from top to bottom on the stator mounting section 13 so that the lower end of the stator assembly 2 is in blocking cooperation with the stator blocking portion 14, sleeve the lower bearing 161 from bottom to top on the lower bearing mounting section 16 so that the upper end of the inner ring of the lower bearing 161 is in blocking cooperation with the lower bearing blocking portion 15. Then, snap the snap ring 121 onto the upper bearing blocking portion 12, and then sleeve the upper bearing 111 from top to bottom on the upper bearing mounting section 11 so that the lower end of the inner ring of the upper bearing 111 is in blocking cooperation with the snap ring 121. Finally, connect the stator assembly 2 to the outer rings of both the lower bearing 161 and the upper bearing 111. The outer rotor motor assembled by the assembly method of the present invention has the characteristics of stable and reliable structure and high assembly efficiency.

Claims

1. An assembly method for an outer rotor motor, the outer rotor motor comprising a stator assembly (2), a rotor assembly (3) and a main shaft body (1), the main shaft body (1) comprising, from top to bottom, an upper bearing mounting section (11), an upper bearing blocking portion (12), a stator mounting section (13), a stator blocking portion (14), a lower bearing blocking portion (15) and a lower bearing mounting section (16), the stator blocking portion (14) and the lower bearing blocking portion (15) being arranged at intervals, and a spacing section (17) being formed therebetween, the main shaft body (1) being provided with an extrusion molding section (18) at the position of the stator blocking portion (14) for convexly protruding outwards to form the stator blocking portion (14), and the main shaft body (1) being provided with an extrusion molding section (18) at the position of the lower bearing blocking portion (15) for convexly protruding outwards to form the lower bearing blocking portion (15); The upper bearing mounting section (11) is used for mounting an upper bearing (111); The upper bearing blocking portion (12) is used to install a retaining spring (121) to block and limit the axial downward movement of the upper bearing (111); The stator mounting section (13) is used for fixedly mounting and connecting with the stator assembly (2); The stator blocking portion (14) is formed integrally with the main shaft body (1) by being protruded outwardly by a mold during the pressing process of the main shaft body (1), and the stator blocking portion (14) is used to block and limit the stator assembly (2) from moving downward in the axial direction; The lower bearing mounting section (16) is used to mount the lower bearing (161); The lower bearing blocking portion (15) is formed integrally with the main shaft body (1) by being protruded outwardly by a mold during the pressing process of the main shaft body (1), and the lower bearing blocking portion (15) is used to block and limit the axial upward movement of the lower bearing (161); Features The assembly method comprises the following steps: S1, processing a main shaft body (1) with a length of L1, so that an extrusion molding section (18) is reserved at the position of the stator blocking portion (14) and the lower bearing blocking portion (15) of the main shaft body (1); S2, extruding the upper part of the main shaft body (1) through a pier pressing die so that the extrusion forming section (18) at the position of the stator blocking section (14) protrudes outwards to form a stator blocking section (14) formed integrally with the main shaft body (1), and then extruding the lower part of the main shaft body (1) through a pier pressing die so that the extrusion forming section (18) at the position of the lower bearing blocking section (15) protrudes outwards to form a lower bearing blocking section (15) formed integrally with the main shaft body (1), so that the length of the main shaft body (1) after pier pressing is L2, L2 is the required standard length, and L2<L1; S3, sleeve the stator assembly (2) from top to bottom on the stator mounting section (13) so that the lower end of the stator assembly (2) is blocked and matched with the stator blocking portion (14), sleeve the lower bearing (161) from bottom to top on the lower bearing mounting section (16) so that the upper end of the inner ring of the lower bearing (161) is blocked and matched with the lower bearing blocking portion (15), then snap the retaining spring (121) onto the upper bearing blocking portion (12), then sleeve the upper bearing (111) from top to bottom on the upper bearing mounting section (11) so that the lower end of the inner ring of the upper bearing (111) is blocked and matched with the retaining spring (121), and finally connect the stator assembly (2) to the outer rings of the lower bearing (161) and the upper bearing (111).

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