An assembling jig and method for an outer rotor frameless torque motor

Abstract

The application provides an assembling jig and assembling method of an outer rotor frameless torque motor, and relates to the field of motor disassembly and assembly. The assembling jig is used for assembling an outer rotor and a stator of an outer rotor frameless torque motor, and comprises a press fitting shell, a guide sleeve, a fixing member, a cover plate and an assembling member. The press fitting shell is used for positioning and containing the outer rotor. The guide sleeve is fixed on a sun gear of the outer rotor through the fixing member. The cover plate is installed on a planet carrier. The cover plate is provided with a threaded matching hole. The assembling member is provided with a thread on the outer periphery. The assembling member is inserted into the matching hole and contained in the guide sleeve. The assembling progress is controlled by rotating the assembling member, so that the collision and friction between the stator and the rotor caused by the magnetic field force in the assembling process are avoided, and other components are prevented from being damaged. The structure is simple and convenient to use. For motors of different sizes, only part of the components need to be replaced to adapt to different sizes. In the motor research and design stage, the research and development cycle of the frameless outer rotor motor is shortened.

Description

Technical Field

[0001] This invention relates to the field of motor assembly and disassembly, and in particular to an assembly fixture and assembly method for an external rotor frameless torque motor. Background Technology

[0002] With the continuous development of robotics and related fields, the demand for non-standard external rotor frameless torque motors in their drive components is increasing. An indispensable part of motor assembly after design and manufacturing is the motor assembly process. The main challenge in motor assembly lies in overcoming the effects of magnetic forces and ensuring coaxial assembly between the stator and rotor.

[0003] Currently, traditional assembly methods for frameless torque motors are primarily used in mass production equipment and assembly line operations. However, in the design process of some external rotor frameless torque motors, multiple iterative structural modifications are often required to meet design requirements. During these iterative optimization processes, using traditional motor assembly methods and equipment is not only costly and involves large equipment volumes, but also, due to the use of mass production equipment, it cannot adequately adapt to the dimensions and specifications of other motors. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this application provides an assembly fixture and assembly method for an external rotor frameless torque motor.

[0005] This application provides an assembly fixture for assembling the outer rotor of an external rotor frameless torque motor with the stator. The fixture includes a press-fit housing, a guide sleeve, a fixing member, a cover plate, and an assembly component. The press-fit housing is used to position and accommodate the outer rotor. The guide sleeve is fixed to the sun gear of the outer rotor by the fixing member and is located on the side of the outer rotor away from the press-fit housing. The cover plate is mounted on the planetary carrier of the stator and is located on the side of the stator away from the outer rotor. The cover plate has a threaded mating hole. The outer periphery of the assembly component is threaded, and the assembly component passes through the mating hole and is accommodated within the guide sleeve.

[0006] In one possible implementation, the press-fit housing is provided with a receiving groove for accommodating the outer rotor and the stator, the opening shape of the receiving groove matching the stator.

[0007] In one possible implementation, the bottom wall of the receiving groove is provided with a positioning hole for positioning the outer rotor contained in the receiving groove.

[0008] In one possible implementation, the bottom wall of the receiving groove is also provided with a cable outlet hole.

[0009] In one possible implementation, the guide sleeve has a guide groove that is clearance-fitted with the assembly, and the bottom wall of the guide groove has a fixing hole, through which the fixing member is disposed in the sun gear.

[0010] In one possible implementation, the assembly includes a driving part and a mating part, the driving part being connected to the mating part, the outer periphery of the mating part being threaded, and the mating part being inserted into the guide groove through the mating hole.

[0011] In one possible implementation, the fastener includes a head and a fixing part, the head being connected to the fixing part, the fixing part being disposed in the sun gear through the fixing hole, and the head abutting against the bottom wall of the guide groove.

[0012] In one possible implementation, the bottom wall of the guide groove is further provided with a clearance groove, and the fixing hole is provided on the bottom wall of the clearance groove, the clearance groove being used to accommodate the head.

[0013] In one possible implementation, the cover plate includes a connecting portion and a through portion, the connecting portion being connected to the through portion, the connecting portion being connected to the output end face of the stator, and the through portion having the mating hole.

[0014] This application also provides:

[0015] An assembly method for an external rotor frameless torque motor includes the following steps:

[0016] The guide sleeve is fixed to the sun gear on the outer rotor by a fastener;

[0017] Place the outer rotor inside the press-fit housing;

[0018] Install the cover plate onto the stator;

[0019] The assembly is passed through the mating hole on the cover plate and inserted into the guide sleeve;

[0020] Rotate the assembly to slowly press the stator into the press-fit housing;

[0021] Rotate the stator to insert the outer rotor into the stator;

[0022] Unscrew the assembly.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The assembly fixture provided in this application positions the outer rotor by pressing the outer shell. The assembly component passes through the cover plate and is accommodated in the guide sleeve, thereby positioning the housing on the cover plate and ensuring the coaxiality between the stator and rotor. Rotating the assembly component slowly presses the housing into the press-fitted outer shell, thus controlling the assembly progress through the rotation of the assembly component. This avoids structural impact deformation caused by the stator and rotor freely attracting each other due to magnetic force during the assembly process, preventing collisions and friction between the stator and rotor, and also preventing damage to other components. The structure is simple and easy to use. For motors of different sizes and specifications, only some parts need to be replaced for adaptation. Under the premise of low cost, high assembly efficiency is achieved, shortening the development cycle of frameless external rotor motors in the motor R&D and design stage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This invention provides a schematic diagram of the structure of an assembly fixture according to an embodiment of the present application.

[0027] Figure 2 It shows Figure 1 A partially disassembled structural diagram of the assembly fixture;

[0028] Figure 3 It shows Figure 2 Another structural schematic diagram of the assembly fixture;

[0029] Figure 4 It shows Figure 1 A cross-sectional view of the assembly fixture during the assembly of an external rotor frameless torque motor.

[0030] Explanation of key component symbols:

[0031] 100-Assembly fixture; 10-Pressure fitting housing; 11-Receiving groove; 12-Positioning hole; 13-Cable outlet hole; 20-Guide sleeve; 21-Guide groove; 22-Fixing hole; 23-Allowing groove; 30-Fixing component; 31-Head; 32-Fixing part; 40-Cover plate; 41-Connecting part; 42-Through part; 421-Matching hole; 43-Gap; 50-Assembly component; 51-Drive part; 52-Matching part; 200-Outer rotor frameless torque motor; 201-Outer rotor; 202-Housing; 203-Stator; 204-Planetary carrier; 205-Sun gear; 206-Planetary gear. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] Example 1

[0038] Please see Figure 1 One embodiment of this application provides an assembly fixture 100 for assembling an external rotor frameless torque motor 200. The assembly fixture 100 has a simple structure, low cost, small size, and is easy to use, improving the assembly efficiency of the external rotor frameless torque motor 200. It can adapt to frameless torque motors of different sizes and specifications by only replacing some components, thereby shortening the design and development cycle of the external rotor frameless torque motor.

[0039] Please also refer to Figure 2 and Figure 3 The frameless torque motor 200 with an external rotor includes an external rotor 201 and a housing 202. A stator 203 and a planetary carrier 204 are housed in the housing 202. A sun gear 205 is located at the center of the external rotor 201. Planetary gears 206 are located in the planetary carrier 204. The assembly fixture 100 is used to mount the external rotor 201 onto the stator 203 in the housing 202, and to engage the sun gear 205 on the external rotor 201 with the planetary gears 206 in the planetary carrier 204.

[0040] Please see Figure 2 The assembly fixture 100 includes a press-fit outer shell 10, a guide sleeve 20, a fixing member 30, a cover plate 40, and an assembly component 50. The press-fit outer shell 10 is used to position and accommodate the outer rotor 201. The guide sleeve 20 is fixed to the sun gear 205 of the outer rotor 201 by the fixing member 30 and is located on the side of the outer rotor 201 away from the press-fit outer shell 10. The cover plate 40 is mounted on the housing 202 and is located on the side of the housing 202 away from the outer rotor 201. The assembly component 50 passes through the cover plate 40 and the housing 202 and is accommodated within the guide sleeve 20.

[0041] Please see Figure 4 In use, the assembly 50 is inserted into the guide sleeve 20 by passing the assembly 50 through the housing 202. Then, the assembly 50 is rotated so that the housing 202 is slowly pressed into the press-fit housing 10 with the cooperation of the assembly 50 and the cover plate 40. Finally, the housing 202 is rotated so that the outer rotor 201 is installed into the housing 202, and at the same time, the sun gear 205 is engaged into the planet gear 206, thus completing the assembly of the frameless torque motor 200 with an outer rotor.

[0042] Specifically, the press-fit outer casing 10 is provided with a receiving groove 11. The receiving groove 11 is used to accommodate the outer rotor 201 and the housing 202. The opening shape of the receiving groove 11 matches the housing 202 so that when the housing 202 is pressed into the receiving groove 11, the inner wall of the receiving groove 11 can be clearance-fitted with the outer wall of the housing 202, thereby ensuring the direction of the housing 202 when pressed in and preventing interference between the housing 202 and the outer rotor 201 in the receiving groove 11.

[0043] The bottom wall of the receiving groove 11 is provided with a positioning hole 12. The positioning hole 12 is used to position the outer rotor 201 contained in the receiving groove 11, thereby preventing it from shifting and causing the outer rotor 201 to collide with the housing 202 during the assembly process.

[0044] The positioning hole 12 is a hole or groove with a circular opening.

[0045] In some embodiments, the opening side of the positioning hole 12 is further provided with a guide slope, which is used to guide the outer rotor 201 placed in the receiving groove 11, thereby positioning the outer rotor 201 in the positioning hole 12.

[0046] The bottom wall of the receiving groove 11 is also provided with a wire outlet hole 13. The wire outlet hole 13 is used to lead out the wires of the frameless torque motor 200, thereby preventing the wires from getting tangled and interfering with other components during assembly, which would affect the smooth progress of assembly.

[0047] The guide sleeve 20 is cylindrical. The guide sleeve 20 is provided with a guide groove 21. The guide groove 21 is used to cooperate with the assembly 50 to guide the insertion direction of the assembly 50, so that the housing 202 connected to the assembly 50 is assembled along the moving direction of the assembly 50.

[0048] The bottom wall of the guide groove 21 is provided with a fixing hole 22. The fixing member 30 passes through the fixing hole 22 and is disposed in the sun gear 205 to fix the guide sleeve 20 to the sun gear 205.

[0049] The fixing member 30 includes a head 31 and a fixing part 32. The head 31 is connected to the fixing part 32. The fixing part 32 passes through the fixing hole 22 and is disposed in the sun gear 205. The head 31 abuts against the bottom wall of the guide groove 21, thereby fixing the guide sleeve 20 to the sun gear 205 by the fixing member 30.

[0050] Please see Figure 4In some embodiments, the bottom wall of the guide groove 21 is further provided with a clearance groove 23. The fixing hole 22 is provided on the bottom wall of the clearance groove 23. The clearance groove 23 is used to accommodate the head 31 of the fixing member 30 to avoid the fixing member 30 from colliding with the assembly 50 inserted into the guide groove 21.

[0051] Specifically, the depth of the clearance groove 23 is greater than or equal to the height of the head 31.

[0052] In some embodiments, the fastener 30 is an internal hexagon head screw, which facilitates applying force to the head 31 to fix the fastener 30 to the sun gear 205. However, it is not limited to this.

[0053] In some embodiments, the end face of the sun gear 205 is provided with a threaded hole to engage with the thread on the outer periphery of the fixing part 32 of the fixing member 30, thereby fixing the fixing part 32 onto the sun gear 205.

[0054] The cover plate 40 includes a connecting portion 41 and a through portion 42. The connecting portion 41 is connected to the through portion 42. The connecting portion 41 is connected to the output end face of the housing 202. The through portion 42 is provided with a mating hole 421. The opening of the mating hole 421 is opposite to the opening of the guide groove 21. The mating hole 421 is used for the assembly 50 to pass through, and is provided in the guide groove 21. The mating hole 421 is also used to mate with the assembly 50, so that the assembly 50 can drive the cover plate 40 to move.

[0055] In some embodiments, the connecting portion 41 is connected to the planetary carrier 204 in the housing 202. However, it is not limited to this; the connecting portion 41 may also be directly connected to the housing 202.

[0056] In some embodiments, the connecting part 41 is connected to the output end face of the housing 202 by bolts.

[0057] The assembly 50 includes a driving part 51 and a mating part 52. The driving part 51 is connected to the mating part 52. The mating part 52 is inserted into the guide groove 21 through the mating hole 421.

[0058] The outer periphery of the mating part 52 is threaded, and the mating hole 421 is a threaded hole, thereby threadedly engaging with the mating part 52. The inner wall of the guide groove 21 is unthreaded and has a clearance fit with the large diameter thread of the outer periphery of the mating part 52, thereby allowing the mating part 52 to rotate freely in the guide groove 21 and guiding the mating part 52 to the direction of movement of the housing 202 through the guide groove 21.

[0059] Rotate the assembly 50 so that the mating part 52 is fully screwed into the mating hole 421 and inserted into the guide groove 21, abutting against the bottom wall of the guide groove 21; continue to rotate the assembly 50 so that the mating part 52 engages with the mating hole 421, and slowly press the housing 202 into the press-fit housing 10 under the drive of the cover plate 40; finally, when the sun gear 205 is about to abut against the planet gear 206, rotate the housing 202 so that the planet gear 206 rotates to avoid the sun gear 205, and continue to press the housing 202 into the press-fit housing 10 so that the outer rotor 201 is installed into the housing 202, and at the same time, the sun gear 205 is engaged and installed into the planet gear 206, completing the assembly of the frameless torque motor 200.

[0060] like Figure 4 As shown, the cover plate 40 has a notch 43 on the side away from the through part 42 to avoid the guide sleeve 20. When the stator 203 slowly descends to the assembly position, the guide sleeve 20 will extend and enter the notch 43, thereby preventing the guide sleeve 20 from colliding with the cover plate 40. The assembly fixture 100 provided in this application positions the outer rotor 201 through the press-fit housing 10. The assembly component 50 passes through the cover plate 40 and is accommodated in the guide sleeve 20, so that the housing 202 on the cover plate 40 is positioned, thereby ensuring the coaxiality between the stator and the rotor. Rotating the assembly component 50 causes the housing 202 to be slowly pressed into the press-fit housing 10. Thus, the assembly progress can be controlled by rotating the assembly component 50, avoiding structural impact deformation caused by the free attraction of the stator and rotor due to the magnetic force during the assembly process, avoiding collisions and friction, and preventing damage to other components. The structure is simple and easy to use. For motors of different sizes and specifications, only some parts need to be replaced to adapt. Under the premise of low cost, high assembly efficiency is achieved, shortening the research and development cycle of frameless outer rotor motors.

[0061] Example 2

[0062] Please also refer to Figures 1 to 4 This application also provides an assembly method for an external rotor frameless torque motor using the above-described assembly fixture 100, for assembling an external rotor frameless torque motor 200. The assembly method includes the following steps:

[0063] Step S101: Fix the guide sleeve 20 to the sun gear 205 on the outer rotor 201 by means of the fastener 30.

[0064] Specifically, the fixing part 32 of the fixing member 30 is passed through the fixing hole 22 of the guide sleeve 20 and placed in the sun gear 205, so that the head 31 of the fixing member 30 abuts against the bottom wall of the relief groove 23, thereby fixing the guide sleeve 20 to the sun gear 205 by the fixing member 30.

[0065] Step S102: Place the outer rotor 201 inside the press-fit housing 10.

[0066] Specifically, the outer rotor 201 is accommodated and positioned in the receiving groove 11 of the press-fit housing 10 through the positioning hole 12.

[0067] Step S103: Install the cover plate 40 on the output end face of the housing 202.

[0068] Specifically, the connecting part 41 of the cover plate 40 is installed on the housing 202 or the planetary carrier 204 in the housing 202, and the cover plate 40 is located on the side of the housing 202 away from the outer rotor 201.

[0069] Step S104: Pass the assembly 50 through the mating hole 421 on the cover plate 40 and insert it into the guide sleeve 20.

[0070] Specifically, the mating part 52 of the assembly 50 is rotated through the mating hole 421 of the cover plate 40 and inserted into the guide groove 21 of the guide sleeve 20, abutting against the bottom wall of the guide groove 21.

[0071] Step S105: Rotate the assembly 50 to slowly press the housing 202 into the press-fit housing 10.

[0072] Specifically, the housing 202 is fixed by hand, and then the assembly 50 is rotated so that the mating part 52 engages with the mating hole 421, slowly pressing the housing 202 into the press-fit outer shell 10 under the action of the cover plate 40. Since the inner wall of the press-fit outer shell 10 and the outer wall of the housing 202 have a clearance fit, when the upper surface of the housing 202 descends to the upper surface of the press-fit outer shell 10, the clearance fit between the housing 202 and the cylindrical surface of the press-fit outer shell 10 ensures that there is no interference between the stator 203 and the outer rotor 201 positioned within the housing 202, guaranteeing their coaxiality. At this time, the magnetic force between the stator 203 and the outer rotor 201 is not significant and will not affect the assembly.

[0073] Step S106: Rotate the housing 202 to install the outer rotor 201 into the housing 202.

[0074] Specifically, as the assembly 50 continues to rotate, the magnetic force begins to increase, and the sun gear 205 gradually approaches the planet gear 206. When the housing 202 descends to the point where the sun gear 205 is about to abut the planet gear 206, the housing 202 is rotated, causing the planet gear 206 to rotate and avoid the sun gear 205. The assembly 50 continues to rotate, pressing the housing 202 into the press-fit housing 10, so that the outer rotor 201 is installed into the housing 202, and at the same time, the sun gear 205 is engaged and installed into the planet gear 206.

[0075] Step S107: Slowly unscrew assembly 50 to complete the assembly of the external rotor frameless torque motor 200.

[0076] Specifically, the assembly 50 is rotated in the reverse direction to detach it. Then, the cover plate 40 is detached from the housing 202. After the fixing member 30 is unscrewed from the sun gear 205, the guide sleeve 20 is taken out. Finally, the outer rotor frameless torque motor 200 is taken out from the press-fit housing 10 to complete the assembly of the outer rotor frameless torque motor 200.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An assembly fixture for assembling the outer rotor and stator of an external rotor frameless torque motor, characterized in that, The assembly includes a press-fit housing, a guide sleeve, a fixing component, a cover plate, and an assembly. The press-fit housing is used to position and accommodate the outer rotor. The guide sleeve is fixed to the sun gear of the outer rotor by the fixing component and is located on the side of the outer rotor away from the press-fit housing. The cover plate is mounted on the planetary carrier of the stator and is located on the side of the stator away from the outer rotor. The cover plate has a threaded mating hole. The outer periphery of the assembly is threaded. The assembly passes through the mating hole and is accommodated in the guide sleeve. The guide sleeve is provided with a guide groove, which is clearance-fitted with the assembly. The bottom wall of the guide groove is provided with a fixing hole, and the fixing member passes through the fixing hole and is disposed in the sun gear. The fastener includes a head and a fixing part. The head is connected to the fixing part. The fixing part passes through the fixing hole and is disposed in the sun gear. The head abuts against the bottom wall of the guide groove. The bottom wall of the guide groove is also provided with a clearance groove, and the fixing hole is provided on the bottom wall of the clearance groove. The clearance groove is used to accommodate the head.

2. The assembly fixture according to claim 1, characterized in that, The press-fit housing is provided with a receiving groove for accommodating the outer rotor and the stator, and the opening shape of the receiving groove matches the stator.

3. The assembly fixture according to claim 2, characterized in that, The bottom wall of the receiving groove is provided with a positioning hole, which is used to position the outer rotor contained in the receiving groove.

4. The assembly fixture according to claim 2, characterized in that, The bottom wall of the receiving tank is also provided with a cable outlet hole.

5. The assembly fixture according to claim 1, characterized in that, The assembly includes a driving part and a mating part. The driving part is connected to the mating part. The outer periphery of the mating part is provided with threads. The mating part passes through the mating hole and is inserted into the guide groove.

6. The assembly fixture according to claim 1, characterized in that, The cover plate includes a connecting part and a through part. The connecting part is connected to the through part and is connected to the output end face of the stator. The through part is provided with the mating hole.

7. A method for assembling an external rotor frameless torque motor, characterized in that, Includes the following steps: The guide sleeve is fixed to the sun gear on the outer rotor by a fastener; Place the outer rotor inside the press-fit housing; Install the cover plate onto the stator; The assembly is passed through the mating hole on the cover plate and inserted into the guide sleeve; Rotate the assembly to slowly press the stator into the press-fit housing; Rotate the stator to insert the outer rotor into the stator; Unscrew the assembly.

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