Motor with integrated double-shaft structure

Abstract

The utility model discloses a motor with an integrated double-shaft structure, which comprises a fixed shaft, an output shaft, a stator assembly, a rotor assembly and a motor lower cover, one end of the fixed shaft is rotatably connected with the motor lower cover in a sealing installation manner, and the other end of the fixed shaft is coaxially and rotatably connected with the output shaft in an installation manner; the stator assembly is fixedly mounted on the periphery of the fixed shaft between the two ends of the fixed shaft; the rotor assembly is located on the periphery of the stator assembly, the upper end of the rotor assembly is fixedly and hermetically connected with the output shaft, and the lower end of the rotor assembly is fixedly and hermetically connected with the motor lower cover. According to the utility model, the structure which is simple, high in sealing performance and easy to assemble is adopted, the functions of an output connection mode of the outer rotor and an output mode of the motor shaft of the inner rotor are simultaneously realized, the performance of high power density and low cost is realized, and the practical application range of the motor is effectively expanded.

Description

Technical Field

[0001] The utility model belongs to the field of drive motors for industrial applications, and in particular relates to a motor with an integrated dual-shaft structure. Background Art

[0002] As drive motors continue to expand into more areas of our lives and work in response to the demands of modern society for market automation and efficient operations, there are increasing demands for higher, more reasonable, more cost-effective, more widely applicable, and more energy-efficient application, fixing, and output methods for drive motors.

[0003] At present, conventional drive motors mainly include outer rotor motors and inner rotor motors. Among them, outer rotor motors usually use independent shells to connect the output or output shaft output, and inner rotor motors use output shaft output. Outer rotor motors need to realize relative rotation of rotor and stator components, and cannot realize the fully sealed state of the motor. If the fully sealed state of the motor needs to be realized, the motor needs to adopt a double shell structure, which leads to disadvantages such as high cost, large size, and complicated structure. Although the inner rotor motor can realize the fully sealed state of the motor, the inner rotor motor coil occupies more external radial dimensions, and the driving diameter is smaller under the same installation diameter space, which leads to application defects such as low power under the same radial installation space conditions.

[0004] Therefore, the applicant hopes to seek technical solutions to improve the above technical problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an integrated dual-shaft structure motor, which adopts a simple, highly sealed and easy-to-assemble structure, and has the functions of an outer rotor output connection method and an inner rotor motor shaft output method, with high power density and low cost, effectively expanding the practical application range of the motor.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] An integrated dual-shaft motor includes a fixed shaft, an output shaft, a stator assembly, a rotor assembly, and a motor lower cover, wherein:

[0008] One end of the fixed shaft is rotatably and hermetically connected to the motor lower cover, and the other end is coaxially and rotatably connected to the output shaft.

[0009] The stator assembly is fixedly mounted on the outer periphery of the fixed shaft between the two ends of the fixed shaft;

[0010] The rotor assembly is located on the outer periphery of the stator assembly, and the upper end of the rotor assembly is fixedly and sealedly connected to the output shaft, and the lower end of the rotor assembly is fixedly and sealedly connected to the motor lower cover.

[0011] Preferably, the motor lower cover is in the shape of a disc, wherein the central portion of the motor lower cover is provided with a first step hole and a second step hole spaced apart in an upper and lower direction, the upper end portion of the motor lower cover is provided with a flange for mounting with the rotor assembly, and the outer periphery of the motor lower cover is provided with a plurality of fastening mounting holes.

[0012] Preferably, a fixed shaft bearing is installed in the first step hole, wherein the fixed shaft bearing is correspondingly sleeved on the outer periphery of the fixed shaft, so as to achieve a rotatable installation effect between the fixed shaft and the lower cover of the motor; a sealing ring is fixedly installed in the second step hole, and the inner lip of the sealing ring is sleeved on the outer periphery of the fixed shaft, so as to achieve a sealing installation effect between the fixed shaft and the lower cover of the motor.

[0013] Preferably, the second step hole is closer to the outer end of the motor lower cover than the first step hole, wherein the aperture of the second step hole is smaller than the aperture of the first step hole.

[0014] Preferably, the rotor assembly includes a rotor housing and a plurality of magnets, and each of the magnets is fixedly arranged on the inner wall of the rotor housing; wherein the upper end of the rotor housing is fixedly and sealedly connected to the output shaft, and the lower end of the rotor housing is fixedly and sealedly connected to the lower cover of the motor.

[0015] Preferably, the inner wall end face of the rotor housing is sealed and sleeved with the flange of the motor lower cover, and the lower end of the rotor housing is provided with a flange surface, which is matched with the outer periphery of the motor lower cover, and the two are fixedly installed by a number of fasteners.

[0016] Preferably, the output shaft is correspondingly sleeved with the upper end portion of the rotor housing, wherein a recessed hole is provided at the end portion of the output shaft near the stator assembly, and an output shaft bearing is installed in the recessed hole, and the output shaft bearing is correspondingly sleeved on the outer periphery of the fixed shaft to achieve a rotatable mounting effect between the output shaft and the fixed shaft.

[0017] Preferably, the sleeve joint between the output shaft and the rotor housing is stepped, wherein the interface portion of the sleeve joint is fixedly sealed by welding.

[0018] Preferably, the rotor housing is formed by integrally processing an iron plate or a steel plate.

[0019] Preferably, the outer end of the output shaft is fixedly connected to the external rotating member, and the outer end of the fixed shaft is fixedly mounted on the flange fixing plate, wherein the interior of the fixed shaft is provided with a wire outlet hole for routing the motor wire harness.

[0020] The present invention proposes a motor solution with an integrated dual-axis structure, avoiding the use of the shell or independent shaft output method of the traditional outer rotor motor, reducing the risk of insufficient sealing of the traditional outer rotor motor. First, one end of the fixed shaft is rotatably and sealedly installed with the lower cover of the motor, and the other end is rotatably and coaxially connected to the output shaft. At the same time, by fixing and sealing the lower cover of the motor, the rotor assembly and the output shaft as one, during the operation of the motor being powered on, the output shaft of the motor has a sealed rotation effect relative to the fixed shaft. The present application adopts a simple, highly sealed and easy-to-assemble structure, and has the functions of the output connection method of the outer rotor and the output method of the inner rotor motor shaft. It has high power density and low cost, and effectively expands the practical application range of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the motor structure of an integrated dual-axis structure under a specific embodiment of the utility model;

[0022] Figure 2 yes Figure 1 sectional view of

[0023] Figure 3 yes Figure 1 A top view of

[0024] Figure 4 It will Figure 1 Schematic diagram of the structure after rotation at a certain angle;

[0025] Figure 5 yes Figure 1 A schematic structural diagram of the middle motor lower cover 16;

[0026] Figure 6 yes Figure 1 Schematic diagram of the assembly structure of the middle output shaft 12 and the rotor housing 14a. DETAILED DESCRIPTION

[0027] An embodiment of the present utility model discloses an electric motor with an integrated dual-shaft structure, comprising a fixed shaft, an output shaft, a stator assembly, a rotor assembly and a motor lower cover, wherein one end of the fixed shaft is rotatably and sealingly mounted in connection with the motor lower cover, and the other end thereof is rotatably and coaxially mounted in connection with the output shaft; the stator assembly is fixedly mounted on the outer periphery of the fixed shaft located between the two ends of the fixed shaft; the rotor assembly is located on the outer periphery of the stator assembly, and the upper end of the rotor assembly is fixedly and sealingly connected to the output shaft, and the lower end of the rotor assembly is fixedly and sealingly connected to the motor lower cover.

[0028] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, an integrated dual-shaft motor 1 (preferably an outer rotor permanent magnet motor) includes a fixed shaft 11, an output shaft 12, a stator assembly 13, a rotor assembly 14 and a motor lower cover 16, wherein one end 111 of the fixed shaft 11 is rotatably and sealedly mounted to the motor lower cover 16, and the other end 112 thereof is rotatably and coaxially mounted to the output shaft 12; the stator assembly 13 is fixedly mounted on the outer periphery of the fixed shaft located between the two ends of the fixed shaft 11; the rotor assembly 14 is located on the outer periphery of the stator assembly 13, and the upper end of the rotor assembly 14 is fixedly and sealedly connected to the output shaft, and the lower end of the rotor assembly 14 is fixedly and sealedly connected to the motor lower cover 16.

[0030] Preferably, in order to further facilitate the sealing installation effect, in the present embodiment, the motor lower cover 16 adopts a disc structure 16a in the shape of a disc, and the central part of the disc structure 16a is respectively provided with a first step hole 161 and a second step hole 162 at intervals in the upper and lower parts, and the upper end part of the disc structure 16a is provided with a circle of flange 163 (the flange 163 is used for installation and cooperation with the rotor assembly 14), and the outer periphery of the disc structure 16a is provided with 8-18 fastening mounting holes; specifically preferably, in the present embodiment, the fastening mounting holes are specifically bolt holes 164, wherein the number of bolt holes 164 is 12.

[0031] Preferably, in this embodiment, a fixed shaft bearing 17 is installed in the first step hole 161, and the fixed shaft bearing 17 is correspondingly sleeved on the outer periphery of the fixed shaft 11, for achieving a rotatable installation effect between the fixed shaft 11 and the motor lower cover 16; a sealing ring 18 is fixedly installed in the second step hole 162, and the inner lip of the sealing ring 18 is sleeved on the outer periphery of the fixed shaft 11, for achieving a sealing installation effect between the fixed shaft 11 and the motor lower cover 16, for blocking external foreign matter from entering the internal space of the motor 1, and effectively improving the overall sealing of the motor 1; in order to further facilitate an efficient sealing installation effect, it is further preferred that in this embodiment, the second step hole 162 is closer to the outer end of the motor lower cover 16 relative to the first step hole 161, wherein the aperture of the second step hole 162 is smaller than the aperture of the first step hole 161.

[0032] Preferably, in this embodiment, the rotor assembly 14 includes a rotor housing 14a and a plurality of magnets 15 (specifically permanent magnets), each of which is fixedly mounted on the inner wall of the rotor housing 14a by bonding. The magnetic field of the magnet 15 interacts with the magnetic field generated by the energized coil of the stator assembly 13 to achieve rotation of the rotor assembly 14; wherein the upper end of the rotor housing 14a is fixedly and sealedly connected to the output shaft 12, and the lower end of the rotor housing 14a is fixedly and sealedly connected to the motor lower cover 16.

[0033] Further preferably, in this embodiment, the inner wall end face 14a1 of the rotor housing 14a corresponds to the flange 163 of the motor lower cover 16 in a sealing sleeve fit, which can effectively improve the installation and positioning accuracy of the motor lower cover 16 and the rotor housing 14a, while enhancing the sealing effect of the motor 1. The flange surface of the rotor housing 14a corresponds to the outer periphery of the motor lower cover 16, and is provided with a number of bolt holes 14a2 corresponding to the outer periphery of the motor lower cover 16. The rotor housing 14a and the motor lower cover 16 are fixedly installed by a number of bolts (not shown in the figure).

[0034] Preferably, in the present embodiment, the output shaft 12 is correspondingly sleeved with the upper end portion of the rotor housing 14a, wherein a recessed hole 121 is provided at the end portion of the output shaft near the stator assembly 13, and an output shaft bearing 19 is installed in the recessed hole 121, and the output shaft bearing 19 is correspondingly sleeved on the outer periphery of the fixed shaft 11, for achieving a rotatable installation effect between the output shaft 12 and the fixed shaft 11; further preferably, in the present embodiment, the sleeved fitting between the output shaft 12 and the rotor housing 14a is stepped, wherein an interface portion 122 at the sleeved fitting is fixedly sealed by welding; further preferably, in the present embodiment, in order to improve the production efficiency of the output shaft 12 and reduce the manufacturing cost, the output shaft 12 is preferably made of one-piece forging; in order to improve the installation connection strength between the output shaft 12 and the rotor housing 14a, synchronous welding is also performed at the lower end portion 123 where the output shaft 12 and the rotor housing 14a are sleeved; further preferably, in the present embodiment, the welding of the output shaft 12 and the rotor housing 14a adopts full-circle welding.

[0035] Preferably, in this embodiment, the rotor housing 14a is an integral part obtained by processing and forming an iron plate or a steel plate, and is preferably made by stretching using a press and a mold. Further preferably, the iron plate or the steel plate is a cold-rolled plate with a thickness of 2.5-6 mm. Even more preferably, in order to improve the rigidity of the rotor housing 14a, a plurality of arc-shaped recessed grooves 14a3 and (or) circular recessed countersunk holes 14a4 are provided on the basin-shaped bottom surface of the rotor housing 14a.

[0036] Preferably, in this embodiment, the outer end of the output shaft 12 is fixedly connected to the external rotating part and locked with a nut 21, and the outer end of the fixed shaft 11 is fixedly mounted on the flange fixing plate 20 and locked with a nut 21. In order to further ensure the sealing connection effect, in this embodiment, a wire outlet hole 113 for routing the motor wiring harness is provided at the center of the fixed shaft 11.

[0037] This embodiment proposes a motor solution with an integrated dual-axis structure, avoiding the use of the shell or independent shaft output method of the traditional outer rotor motor, reducing the risk of insufficient sealing of the traditional outer rotor motor. First, one end of the fixed shaft 11 is rotatably and sealedly mounted with the motor lower cover 16, and the other end thereof is coaxially and rotatably mounted with the output shaft 12. At the same time, by fixing and sealing the motor lower cover 16, the rotor assembly 14 and the output shaft 12 as a whole, when the motor 1 is powered on and running, the output shaft 12 of the motor 1 has a sealed rotation effect relative to the fixed shaft 11. This embodiment adopts a simple, highly sealed and easy-to-assemble structure, and has the functions of the outer rotor output connection method and the inner rotor motor shaft output method. It has high power density and low cost, and effectively expands the actual application range of the motor.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An integrated dual-axis motor, characterized in that: It includes a fixed shaft, an output shaft, a stator assembly, a rotor assembly and a motor lower cover, wherein: One end of the fixed shaft is rotatably and hermetically connected to the motor lower cover, and the other end is coaxially and rotatably connected to the output shaft. The stator assembly is fixedly mounted on the outer periphery of the fixed shaft between the two ends of the fixed shaft; The rotor assembly is located on the outer periphery of the stator assembly, and the upper end of the rotor assembly is fixedly and sealedly connected to the output shaft, and the lower end of the rotor assembly is fixedly and sealedly connected to the motor lower cover.

2. The motor with an integrated dual-axis structure according to claim 1, characterized in that: The motor lower cover is in the shape of a disc, wherein a first step hole and a second step hole are respectively provided at the center of the motor lower cover and are spaced apart in an upper and lower direction. A flange is provided at the upper end of the motor lower cover for mounting with the rotor assembly, and a plurality of fastening mounting holes are provided at the outer periphery of the motor lower cover.

3. The motor with an integrated dual-axis structure according to claim 2, characterized in that: A fixed shaft bearing is installed in the first step hole, wherein the fixed shaft bearing is correspondingly sleeved on the outer circumference of the fixed shaft, so as to achieve a rotatable installation effect between the fixed shaft and the lower cover of the motor; a sealing ring is fixedly installed in the second step hole, and the inner lip of the sealing ring is sleeved on the outer circumference of the fixed shaft, so as to achieve a sealing installation effect between the fixed shaft and the lower cover of the motor.

4. The motor with an integrated dual-shaft structure according to claim 3, characterized in that: The second stepped hole is closer to the outer end of the motor lower cover than the first stepped hole, wherein the aperture of the second stepped hole is smaller than the aperture of the first stepped hole.

5. The motor with an integrated dual-shaft structure according to claim 1, characterized in that: The rotor assembly includes a rotor housing and a plurality of magnets, each of which is fixedly arranged on the inner wall of the rotor housing; wherein the upper end of the rotor housing is fixedly and sealedly connected to the output shaft, and the lower end of the rotor housing is fixedly and sealedly connected to the lower cover of the motor.

6. The motor with an integrated dual-shaft structure according to claim 5, characterized in that: The inner wall end surface of the rotor housing is sealed and sleeved with the flange of the motor lower cover, and the lower end of the rotor housing is provided with a flange surface, which is matched with the outer periphery of the motor lower cover, and the two are fixedly installed by a number of fasteners.

7. The motor with an integrated dual-shaft structure according to claim 5, characterized in that: The output shaft is correspondingly sleeved with the upper end of the rotor housing, wherein a concave hole is provided at the end of the output shaft near the stator assembly, and an output shaft bearing is installed in the concave hole. The output shaft bearing is correspondingly sleeved on the outer periphery of the fixed shaft to achieve a rotatable installation effect between the output shaft and the fixed shaft.

8. The motor with an integrated dual-shaft structure according to claim 7, characterized in that: The sleeve joint between the output shaft and the rotor housing is stepped, wherein the interface portion of the sleeve joint is fixedly sealed by welding.

9. The motor with an integrated dual-shaft structure according to claim 5, characterized in that: The rotor housing is formed by integrally processing an iron plate or a steel plate.

10. The motor with an integrated dual-shaft structure according to claim 1, characterized in that: The outer end of the output shaft is fixedly connected to the external rotating member, and the outer end of the fixed shaft is fixedly mounted on the flange fixing plate, wherein the interior of the fixed shaft is provided with a wire outlet hole for routing the motor wire harness.

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