An assembling device and assembling process suitable for micro motor rotating shaft and magnetic yoke

Abstract

The application relates to an assembling device and assembling process suitable for assembling a rotating shaft and a magnetic yoke of a micro motor, and belongs to the technical field of motor assembling, which comprises a rotating shaft tool for installing the rotating shaft and a magnetic yoke tool for installing the magnetic yoke, the rotating shaft tool is provided with an installation surface, a containing space and a suction accessory, the installation surface can be attached to the shaft shoulder side wall of the rotating shaft, the suction accessory can suck and fix the rotating shaft on the rotating shaft tool, and the shaft shoulder side wall of the rotating shaft is attached to the installation surface and the end of the rotating shaft is inserted into the containing space. The application has the effects of avoiding damage to the surface of the rotating shaft and improving the assembling precision of the rotating shaft.

Description

Technical Field

[0001] This application relates to the field of motor assembly technology, and in particular to an assembly device and assembly process suitable for the shaft and yoke of a micro motor. Background Technology

[0002] In micro motors, the shaft and yoke are the core components of the rotor system. The shaft is the "skeleton" and "power link" of the motor rotor. Its core functions are to transmit torque, support rotor components, and ensure concentricity during operation. The yoke is a key component of the magnetic circuit on the rotor side of the motor. Its core functions are to guide the magnetic field, reduce magnetic resistance, fix magnetic source components, and serve as the core medium for "electromagnetic coupling." The two complement each other and work together, directly determining the power transmission efficiency, magnetic circuit performance, and operational stability of the motor.

[0003] During the assembly process of the shaft and the yoke, an assembly fixture is required to insert the shaft into the yoke. Existing assembly fixtures, such as... Figure 1 The rotating shaft 1 is clamped by a three-jaw chuck 7, and then the three-jaw chuck 7 is moved by a hydraulic component. The jaws of the three-jaw chuck 7 press against the shoulder 12 of the rotating shaft 1, inserting the rotating shaft 1 into the magnetic yoke, thus completing the assembly of the rotating shaft 1 and the magnetic yoke. However, in the existing assembly fixtures, when the jaws of the three-jaw chuck clamp the rotating shaft, there is a gap between the jaws and the shoulder. This causes the jaws to slip on the surface of the rotating shaft during the insertion of the rotating shaft into the magnetic yoke, causing damage to the surface of the rotating shaft and thus reducing the assembly accuracy of the rotating shaft. Summary of the Invention

[0004] To improve construction safety during the construction process, this application provides an assembly device and assembly process suitable for micro motor shafts and magnetic yokes.

[0005] The technical solution provided in this application for an assembly device and assembly process suitable for micro motor shafts and yokes is as follows:

[0006] An assembly device for a micro motor shaft and yoke includes a shaft fixture for mounting the shaft and a yoke fixture for mounting the yoke. The shaft fixture has a mounting surface, a receiving space, and an adsorption component. The mounting surface can fit against the shoulder sidewall of the shaft. The adsorption component adsorbs and fixes the shaft onto the shaft fixture, so that the shoulder sidewall of the shaft fits against the mounting surface and the end of the shaft is inserted into the receiving space.

[0007] By adopting the above technical solution, during the installation of the rotating shaft and the rotating shaft tooling, the end of the rotating shaft is inserted into the receiving space, the shoulder sidewall of the rotating shaft is attached to the mounting surface, and the adsorption component adsorbs and fixes the shoulder to the mounting surface, thus completing the installation of the rotating shaft and the rotating shaft tooling. Due to the attachment between the mounting surface and the shoulder, the rotating shaft tooling and the rotating shaft remain stationary during the process of being inserted into the magnetic yoke under axial force, thereby avoiding damage to the surface of the rotating shaft and improving the assembly accuracy of the rotating shaft.

[0008] Preferably, the rotating shaft tooling has a limiting keyway, and the first positioning key axially arranged on the rotating shaft can be inserted into the limiting keyway to limit the circumferential rotation of the rotating shaft itself.

[0009] By adopting the above technical solution, during the assembly process of the rotating shaft and the magnetic yoke, the insertion of the first positioning key into the limiting keyway can prevent the rotating shaft from rotating circumferentially, ensuring the accurate relative position of the rotating shaft and the magnetic yoke, and further improving the assembly precision and stability.

[0010] Preferably, the rotating shaft fixture is provided with a positioning pin, and the magnetic yoke fixture is provided with a positioning groove that cooperates with the positioning pin. The positioning pin can be inserted into the positioning groove to guide the rotating shaft into the magnetic yoke.

[0011] By adopting the above technical solution, during the process of inserting the rotating shaft into the magnetic yoke, the positioning pin and the positioning groove cooperate to provide accurate guidance for the insertion of the rotating shaft into the magnetic yoke, so that the rotating shaft can be inserted into the magnetic yoke more accurately, thereby improving the accuracy and efficiency of assembly.

[0012] Preferably, the magnetic yoke fixture has a mounting groove for placing the magnetic yoke, and the mounting groove has a positioning keyway. The second positioning key on the magnetic yoke can be inserted into the positioning keyway to restrict the circumferential rotation of the magnetic yoke.

[0013] By adopting the above technical solution, the magnetic yoke is placed in the mounting slot of the magnetic yoke fixture, and the second positioning key on the magnetic yoke is inserted into the positioning keyway of the mounting slot, which can effectively prevent the magnetic yoke from rotating circumferentially during the assembly process and ensure the accurate relative position of the magnetic yoke and the rotating shaft.

[0014] Preferably, it also includes a drive assembly, which is connected to the rotating shaft tooling via a buffer compression assembly, and the drive assembly can drive the rotating shaft to insert the magnetic yoke through the buffer compression assembly.

[0015] By adopting the above technical solution, the drive assembly and the rotating shaft tooling are connected by a buffer extrusion assembly, which can buffer the driving force of the drive assembly and avoid damage to the rotating shaft or magnetic yoke caused by excessive driving force. At the same time, it can make the rotating shaft smoothly inserted into the magnetic yoke, thereby improving the stability and reliability of the assembly.

[0016] Preferably, the buffer compression assembly includes a mounting part, in which a pressure chamber is formed. A piston is mounted on the mounting part and slides within the pressure chamber. The piston is slidably sealed to the side wall of the pressure chamber by a first sealing ring. A piston rod is fixedly mounted on the piston. The piston rod is slidably sealed to the mounting part by a second sealing ring. The piston rod slides out of the mounting part and is fixedly connected to the rotating shaft fixture. The piston divides the pressure chamber into a first chamber and a second chamber. The mounting part can drive the piston to compress the gas in the second chamber and can apply an axial assembly force to the rotating shaft.

[0017] By adopting the above technical solution, the piston of the buffer extrusion assembly slides in the pneumatic chamber and is sealed by the first and second sealing rings. The piston divides the pneumatic chamber into a first chamber and a second chamber. The mounting part drives the piston to compress the gas in the second chamber, which can provide a more stable and adjustable axial assembly force for the shaft during assembly, reduce the impact force during the assembly process, and further ensure the assembly quality and accuracy of the shaft.

[0018] Preferably, the rotating shaft tooling is equipped with a first pressure sensor, and the detection end of the first pressure sensor is located inside the second cavity.

[0019] By adopting the above technical solution, the first pressure sensor can monitor the pressure in the second cavity in real time, providing data support for judging the axial assembly force on the shaft. Furthermore, the pressure reading of the first pressure sensor can more intuitively and timely judge the assembly status of the shaft and the yoke.

[0020] Preferably, the mounting part is provided with a gas channel, the first cavity and the second cavity are connected through the gas channel, a gas valve is connected in series on the gas channel, the gas valve can control the opening and closing of the gas channel, and a second pressure sensor is provided on the mounting part, the detection end of the second pressure sensor is located in the first cavity.

[0021] By adopting the above technical solution, the gas valve can control the opening and closing of the gas passage between the first chamber and the second chamber, which facilitates the adjustment of the gas pressure in the two chambers. At the same time, the second pressure sensor can monitor the pressure in the first chamber in real time, enabling the operator to adjust the assembly process according to pressure changes, thereby improving the controllability and accuracy of the assembly.

[0022] Preferably, the mounting part is provided with a linear drive mechanism, which can abut against the piston rod and drive the piston rod to reset.

[0023] By adopting the above technical solution, after assembly, the piston rod can be driven to reset by the linear drive mechanism abutting against the piston rod, which in turn drives the rotating shaft tooling to reset, facilitating the next assembly operation of the rotating shaft and magnetic yoke, and improving the ease of use and work efficiency of the assembly device.

[0024] An assembly process suitable for micro motor shafts and yokes includes the following steps: S1 The yoke is installed on a yoke fixture, and the shaft is fixed to the mounting surface by an adsorption component, completing the installation of the shaft and the shaft fixture; S2 The shaft and the yoke are aligned, and the locating pin and the locating groove are aligned. The shaft is driven to insert into the yoke and the locating pin is inserted into the locating groove by a drive assembly; S3 The drive assembly continues to push the mounting part towards the yoke, so that the pressure difference ΔP between the first cavity and the second cavity increases to ΔPg, and at this time the piston rod is subjected to an axial thrust Fg, inserting the shaft into the yoke; S4 The shaft is disengaged from the shaft fixture, and the piston rod is driven to reset by a linear drive mechanism, and the piston rod drives the shaft fixture to reset.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The mounting surface fits against the shoulder sidewall, and the adsorption component adsorbs and fixes the rotating shaft. When the rotating shaft is inserted into the magnetic yoke under axial force, the rotating shaft tooling and the rotating shaft remain relatively stationary, avoiding damage to the rotating shaft surface and improving assembly accuracy.

[0027] 2. The limiting keyway cooperates with the first positioning key to prevent the shaft from rotating circumferentially and ensure assembly accuracy;

[0028] 3. Insert the locating pin into the locating slot to guide the rotating shaft to accurately insert into the magnetic yoke, thereby improving assembly accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a three-jaw chuck clamping a rotating shaft in the prior art.

[0030] Figure 2 This is a schematic diagram of the structure of an assembly device for a micro motor shaft and yoke according to an embodiment of this application.

[0031] Figure 3 It is an exploded view showing the installation of the shaft and shaft tooling.

[0032] Figure 4 This is a schematic diagram of the installation of the magnetic yoke and the magnetic yoke fixture.

[0033] Figure 5 This is a top view of the assembly of the rotating shaft tooling and the magnetic yoke tooling.

[0034] Figure 6 It is along Figure 5 A cross-sectional view along line AA in the middle.

[0035] Figure 7 yes Figure 2 Enlarged view of section B in the middle.

[0036] Figure 8It is a top view showing the connection between the mounting section and the rotating shaft tooling.

[0037] Figure 9 It is along Figure 8 A cross-sectional view of the CC line.

[0038] Figure 10 It is along Figure 8 A cross-sectional view of the DD line.

[0039] Explanation of reference numerals in the attached drawings: 1. Rotating shaft; 11. Mating section; 12. Shoulder; 13. First locating key; 2. Magnetic yoke; 21. Second locating key; 3. Rotating shaft fixture; 31. Connecting groove; 32. Mounting surface; 33. Accommodating space; 34. Limiting keyway; 35. Adsorption component; 351. Locating pin; 4. Magnetic yoke fixture; 41. Mounting groove; 42. Locating keyway; 43. Accommodating groove; 44. Locating groove; 5. Drive assembly; 51. Linear hydraulic cylinder; 6. Buffer squeeze Pressure assembly; 61. Mounting part; 62. Air pressure chamber; 621. First chamber; 6211. Main chamber; 6212. Auxiliary chamber; 622. Second chamber; 63. Piston; 64. First sealing ring; 65. Piston rod; 66. Second sealing ring; 671. First pressure sensor; 672. Second pressure sensor; 68. Connecting pipe; 681. Gas passage; 69. Air valve; 7. Three-jaw chuck; 8. Linear drive mechanism; 81. Support plate; 82. Guide rod. Detailed Implementation

[0040] The following will be combined with the appendix Figures 2-10 The technical solutions in the embodiments of the present invention are further described in detail below. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Those skilled in the art can certainly combine the embodiments of the present invention to obtain other embodiments without creative effort, which are also within the protection scope of the present invention.

[0041] This application mainly adopts a scheme of using a rotating shaft tool 3 to adsorb and fix the rotating shaft 1, position and guide it, and buffer the assembly, which achieves the effect of avoiding damage to the surface of the rotating shaft 1 and improving the assembly accuracy. The following is a further detailed description of this application.

[0042] This application discloses an assembly device suitable for micro motor shafts and yokes.

[0043] Reference Figure 2 An assembly device suitable for micro motor shafts and yokes includes a shaft fixture 3, a yoke fixture 4, a drive assembly 5, and a buffer compression assembly 6. The yoke fixture 4 is fixed to the frame by bolts. In this embodiment, the drive assembly 5 is a linear hydraulic cylinder 51. The piston rod 65 of the linear hydraulic cylinder 51 is connected to the shaft fixture 3 through the buffer compression assembly 6. The shaft fixture 3 and the yoke fixture 4 are arranged horizontally opposite each other.

[0044] Reference Figure 3 , Figure 4 The rotating shaft 1 includes a mating section 11, a shoulder 12, and a first positioning key 13. When the rotating shaft 1 is inserted into the magnetic yoke 2, the mating section 11 on the rotating shaft 1 is adapted to the magnetic yoke 2. The first positioning key 13 is disposed on the shoulder 12 of the rotating shaft 1. There are several first positioning keys 13, each of which is arranged along the axial direction of the rotating shaft 1, and the several first positioning keys 13 are evenly spaced along the circumference of the rotating shaft 1. A plurality of second positioning keys 21 are integrally formed on the outer wall of the magnetic yoke 2. Each second positioning key 21 is arranged along the axial direction of the magnetic yoke 2, and the multiple second positioning keys 21 are evenly arranged along the circumference of the magnetic yoke 2.

[0045] Reference Figure 4 , Figure 5 and Figure 6 The magnetic yoke fixture 4 has a mounting groove 41 at its center, which is opposite to the rotating shaft fixture 3. The mounting groove 41 is adapted to the magnetic yoke 2. The side wall of the mounting groove 41 has a positioning keyway 42 that corresponds one-to-one with the second positioning key 21. The positioning keyway 42 is adapted to the second positioning key 21. When the magnetic yoke 2 is inserted into the mounting groove 41, the second positioning key 21 is inserted into the positioning keyway 42, which can effectively prevent the magnetic yoke 2 from rotating circumferentially during assembly and ensure the accurate relative position of the magnetic yoke 2 and the rotating shaft 1. Since the rotating shaft 1 and the magnetic yoke 2 are assembled by a heat-fitting + spline interference fit, the magnetic yoke 2 needs to be heated to 150-300°C on the magnetic yoke fixture 4. Therefore, the heated magnetic yoke 2 and the mounting groove 41 are connected by an interference fit, so that the magnetic yoke 2 can be installed and fixed on the magnetic yoke fixture 4. The magnetic yoke fixture 4 has a receiving groove 43 that communicates with the mounting groove 41. The receiving groove 43 is used to receive the part of the rotating shaft 1 that passes through the magnetic yoke 2.

[0046] Reference Figure 3 , Figure 5 and Figure 6The rotating shaft fixture 3 has a connecting groove 31 opposite to the mounting groove 41. The mounting groove 41 is adapted to the shaft shoulder 12. The bottom wall of the connecting groove 31 forms a mounting surface 32. A receiving space 33 is provided on the bottom wall of the connecting groove 31. The receiving space 33 is used to accommodate the part of the rotating shaft 1 that passes through the mounting groove 41, and there is a gap between the receiving space 33 and the rotating shaft 1. A limiting keyway 34 corresponding to the first positioning key 13 is provided on the side wall of the connecting groove 31. The limiting keyway 34 is adapted to the first positioning key 13. An adsorption member 35 is fixedly provided in the receiving space 33 of the rotating shaft fixture 3. In this embodiment, the adsorption member 35 is an electromagnet. There is a certain gap between the adsorption member 35 and the end of the rotating shaft 1 inserted into the receiving space 33, which ensures that the adsorption member 35 adsorbs and fixes the rotating shaft 1, and avoids contact between the adsorption member 35 and the rotating shaft 1. When installing the rotating shaft 1, the adsorption component 35 is used to adsorb and fix the rotating shaft 1 so that the side wall of the shaft shoulder 12 fits with the mounting surface 32 and the end is inserted into the receiving space 33. When the rotating shaft 1 is inserted into the magnetic yoke 2 under axial force, the rotating shaft tooling 3 and the rotating shaft 1 remain relatively stationary, avoiding damage to the surface of the rotating shaft 1 and improving the assembly accuracy.

[0047] Reference Figure 6 Two positioning pins 351 are fixedly provided on the rotating shaft fixture 3, and the two positioning pins 351 are set towards the magnetic yoke fixture 4. The magnetic yoke 2 has positioning grooves 44 that correspond one-to-one with the positioning pins 351. The positioning grooves 44 are adapted to the positioning pins 351. When the rotating shaft 1 is assembled into the magnetic yoke 2, the positioning pins 351 are inserted into the positioning grooves 44 and slide in the positioning grooves 44 to guide the assembly path of the rotating shaft 1 and the magnetic yoke 2, so that the rotating shaft 1 can be inserted into the magnetic yoke 2 more accurately, thereby improving the accuracy and efficiency of the assembly.

[0048] Reference Figure 7 , Figure 8 In this embodiment, the buffer compression assembly 6 includes a mounting part 61, which is a cylindrical structure and is fixedly connected to the piston rod 65 of the linear hydraulic cylinder 51.

[0049] Reference Figure 8 , Figure 9The mounting part 61 has an internal air pressure chamber 62, and a piston 63 is slidably mounted within the air pressure chamber 62. The piston 63 divides the air pressure chamber 62 into a first chamber 621 near the magnetic yoke 2 and a second chamber 622. A first sealing ring 64 is fixedly fitted onto the piston 63, and the piston 63 is slidably and sealingly connected to the cavity wall of the air pressure chamber 62 through the first sealing ring 64 to ensure the sealing between the first chamber 621 and the second chamber 622. A piston rod 65 is fixedly connected to one side of the first chamber 621, and the piston rod 65 passes through the first chamber 621 and exits the mounting part 61, and is fixedly connected to the rotating shaft fixture 3. A second sealing ring 66 is fixedly embedded in the side wall of the through hole of the mounting part 61 that mates with the piston rod 65. The second sealing ring 66 slidably abuts against the piston rod 65 to achieve a sliding seal between the piston rod 65 and the mounting part 61. By setting the air pressure chamber 62 as a closed structure, the thrust applied by the gas to the piston rod 65 is the pressure difference between the first chamber 621 and the second chamber 622. This makes the distance that the piston rod 65 slides to reach the required axial thrust smaller, reducing the wear of the first sealing ring 64 and improving the service life of the first sealing ring 64.

[0050] A first pressure sensor 671 and a second pressure sensor 672 are fixedly installed on the mounting part 61. The detection end of the first pressure sensor 671 is inserted into the second cavity 622 to detect the gas pressure in the second cavity 622. The detection end of the second pressure sensor 672 is inserted into the first cavity 621 to detect the gas pressure in the first cavity 621.

[0051] Reference Figure 9 , Figure 10 The first cavity 621 includes a main cavity 6211 and an auxiliary cavity 6212. The main cavity 6211 and the second cavity 622 are located on both sides of the piston 63. The auxiliary cavity 6212 is located outside the pressure chamber 62 and is arranged in a minor arc along the circumference of the mounting part 61. By setting the auxiliary cavity 6212, the volume of the original main cavity 621 is increased, so that the volume change of the first cavity 621 during the movement of the piston 63 is reduced as a proportion of the overall volume of the first cavity 621. This reduces the impact of excessive pressure changes in the first cavity 621 on the second sealing ring 66 and improves the sealing effect of the second sealing ring 66.

[0052] A connecting pipe 68 is fixedly installed on the mounting part 61. One end of the connecting pipe 68 is connected to the first cavity 621, and the other end is connected to the second cavity 622. A gas channel 681 is formed inside the connecting pipe 68. A gas valve 69, which is a solenoid valve, is connected in series with the connecting pipe 68 to control the opening and closing of the gas channel 681. The first pressure sensor 671 and the second pressure sensor 672 are connected to the central processing unit (CPU) to transmit the pressure information collected by the sensors to the CPU. The CPU processes the collected pressure information and outputs control signals to the gas valve 69 and the alarm device to control the opening and closing of the gas valve 69 and the alarm device circuit.

[0053] The volume of the space in the first chamber 621 is V1 and the pressure is P1. The volume of the second chamber 622 is V2 and the pressure is P2. The pressure difference between the first chamber 621 and the second chamber 622 is ΔP. ​​The axial thrust applied to the piston rod 65 is F, which can be obtained from ΔP and the area of ​​the piston 63. The axial thrust required for the interference fit between the rotating shaft 1 mating section 11 and the magnetic yoke 2 is Fg. The pressure difference between the first chamber 621 and the second chamber 622 corresponding to Fg is ΔPg. The maximum allowable axial thrust applied by the piston rod 65 to the rotating shaft 1 is set to Fmax. The pressure difference between the first chamber 621 and the second chamber 622 corresponding to Fmax is ΔPmax. The premise for the gas valve 69 to control the opening of the gas channel 681 is: P1>P2.

[0054] When the mating section 11 of the driving shaft 1 of the linear hydraulic cylinder 51 begins to contact the magnetic yoke 2, P1=P2, ΔP=0, and the air valve 69 is in the closed state.

[0055] The linear hydraulic cylinder 51 drives the rotating shaft 1 to continue inserting the magnetic yoke 2. P1 decreases, P2 increases, ΔP>0, and the air valve 69 remains closed. When ΔP increases to ΔPg, the piston rod 65 applies an axial thrust Fg to the rotating shaft 1, causing the mating section 11 of the rotating shaft 1 to insert. This gradually increases the axial thrust F of the rotating shaft 1 from 0 to Fg, resulting in a "flexible contact" between the rotating shaft 1 and the magnetic yoke 2, preventing the magnetic yoke 2 from being squeezed and deformed due to a sudden increase in axial thrust. At the same time, the gradually increasing thrust causes the stress between the rotating shaft 1 and the magnetic yoke 2 to accumulate slowly, which can be "buffered" by the elastic deformation of the material, ensuring that the stress always remains within the elastic range.

[0056] When jamming occurs between the magnetic yoke 2 and the rotating shaft 1 due to machining errors or alignment errors, the piston 63 will move again, causing P1 to decrease further and P2 to increase further, until ΔP increases to ΔPmax. At this time, the central processing unit outputs a control signal to control the alarm device to issue a warning message, and immediately stop the machine to clean or correct it, so as to avoid forcibly applying force and damaging the accuracy of the mating surface.

[0057] Reference Figure 7The mounting part 61 is provided with a support plate 81 along its circumference. The back of the rotating shaft tooling 3 is fixedly provided with guide rods 82 located on both sides of the piston rod 65. Each guide rod 82 is provided along the axial direction of the mounting part 61. The guide rods 82 correspond one-to-one with the support plates 81. Each guide rod 82 slides through the corresponding support plate 81 to guide the sliding of the rotating shaft tooling 3.

[0058] A linear drive mechanism 8 is fixedly provided on the linear hydraulic cylinder 51. In this embodiment, the linear drive mechanism 8 includes, but is not limited to, one of a linear air cylinder, a linear hydraulic cylinder, and a linear motor, preferably a linear air cylinder. The cylinder body of the linear air cylinder is fixedly connected to the piston rod of the linear hydraulic cylinder 51. The piston rod of the linear air cylinder is positioned opposite to the end of the guide rod 82. After the rotating shaft 1 and the magnetic yoke 2 are assembled, the rotating shaft fixture 3 is disengaged from the rotating shaft 1, and the linear hydraulic cylinder 51 retracts. Under the action of the pressure difference between the first chamber 621 and the second chamber 622 and the push of the linear air cylinder, the rotating shaft fixture 3 is reset.

[0059] Because gas leakage is inevitable between the first sealing ring 64 and the cavity wall of the air pressure chamber 62, when the piston 63 resets, P1>P2. At this time, the central controller controls the air valve 69 to be open, so that the gas passage 681 is in the conducting state. At this time, P1=P2, and the air valve 69 is closed, reducing the length that the piston 63 moves when it reaches Fg, reducing the wear of the first sealing ring 64, and thus improving the service life of the first sealing ring 64.

[0060] The implementation principle of the assembly device for a micro motor shaft and yoke according to an embodiment of this application is as follows: During the installation of the shaft 1 and the shaft fixture 3, the end of the shaft 1 is inserted into the receiving space 33, the side wall of the shaft shoulder 12 of the shaft 1 is attached to the mounting surface 32, and the adsorption component 35 adsorbs and fixes the shaft shoulder 12 to the mounting surface 32, thus completing the installation of the shaft 1 and the shaft fixture 3. Due to the attachment between the mounting surface 32 and the shaft shoulder 12, the shaft fixture 3 and the shaft 1 remain stationary during the process of the shaft 1 being inserted into the yoke 2 under axial force, thereby avoiding damage to the surface of the shaft 1 and improving the assembly accuracy of the shaft 1.

[0061] This application also discloses an assembly process suitable for micro motor shafts and yokes. Using the above-mentioned assembly device for micro motor shafts and yokes, the process further includes the following steps:

[0062] S1 installs the magnetic yoke 2 on the magnetic yoke fixture 4 and heats the magnetic yoke 2. The heated magnetic yoke fixture 4 is then fixed. The rotating shaft 1 is inserted into the connecting groove 31 and fixed to the mounting surface 32 by adsorption through the adsorption component 35, thus completing the installation of the rotating shaft 1 and the rotating shaft fixture 3.

[0063] S2 aligns the rotating shaft 1 with the magnetic yoke 2 and the positioning pin 351 with the positioning groove 44. The linear hydraulic cylinder 51 drives the mating section 11 of the rotating shaft 1 to contact the magnetic yoke 2, and the positioning pin 351 is inserted into the positioning groove 44.

[0064] S3 linear hydraulic cylinder 51 drives the rotating shaft 1 to continue inserting the magnetic yoke 2. P1 decreases, P2 increases, ΔP>0, and the air valve 69 remains closed. When ΔP increases to ΔPg, the axial thrust applied by the piston rod 65 to the rotating shaft 1 is Fg, which causes the mating section 11 of the rotating shaft 1 to insert into the magnetic yoke 2, completing the assembly of the rotating shaft 1 and the magnetic yoke 2.

[0065] S4 disengages the rotating shaft 1 from the rotating shaft fixture 3, the linear hydraulic cylinder 51 retracts, and the linear air cylinder pushes the rotating shaft fixture 3 to reset.

[0066] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An assembly device for a micro motor rotor shaft and a magnetic yoke, characterized in that: The application relates to a rotating shaft tool (3) and a magnetic yoke tool (4) for installing a rotating shaft (1) and a magnetic yoke (2), wherein the rotating shaft tool (3) is provided with an installation surface (32) capable of abutting a shaft shoulder (12) side wall of the rotating shaft (1), a containing space (33) and a suction accessory (35) for sucking and fixing the rotating shaft (1) on the rotating shaft tool (3) and making the shaft shoulder (12) side wall of the rotating shaft (1) abut the installation surface (32) and the end of the rotating shaft (1) inserted into the containing space (33). The rotating shaft tool (3) is provided with a positioning pin (351), and the magnetic yoke tool (4) is provided with a positioning groove (44) matched with the positioning pin (351), the positioning pin (351) can be inserted into the positioning groove (44) to guide the rotating shaft (1) to be inserted into the magnetic yoke (2). The application further comprises a driving assembly (5) connected with the rotating shaft tool (3) through a buffer extrusion assembly (6), and the driving assembly (5) can drive the rotating shaft (1) to be inserted into the magnetic yoke (2) through the buffer extrusion assembly (6). The buffer extrusion assembly (6) comprises an installation part (61) provided with a gas pressure cavity (62) therein, a piston (63) slidingly connected with the gas pressure cavity (62) and fixedly arranged on the installation part (61), a piston rod (65) fixedly arranged on the piston (63) and slidingly connected with the installation part (61) through a second sealing ring (66), and the piston rod (65) is slidingly arranged out of the installation part (61) and fixedly connected with the rotating shaft tool (3), the piston (63) divides the gas pressure cavity (62) into a first cavity (621) and a second cavity (622), the installation part (61) can drive the piston (63) to compress the gas in the second cavity (622) and apply an axial assembly force to the rotating shaft (1).

2. The assembly device for micro motor shaft and yoke according to claim 1, wherein: The rotating shaft tool (3) is provided with a limiting key groove (34), and a first positioning key (13) arranged in the axial direction of the rotating shaft (1) can be inserted into the limiting key groove (34) to limit the circumferential rotation of the rotating shaft (1).

3. The assembly device for micro motor shaft and yoke according to claim 1, wherein: The magnetic yoke tool (4) is provided with an installation groove (41) for placing the magnetic yoke (2), and the installation groove (41) is provided with a positioning key groove (42), a second positioning key (21) on the magnetic yoke (2) can be inserted into the positioning key groove (42) to limit the circumferential rotation of the magnetic yoke (2).

4. The assembly device for micro motor shaft and yoke according to claim 1, wherein: The rotating shaft tool (3) is provided with a first pressure sensor (671), and the detection end of the first pressure sensor (671) is located in the second cavity (622).

5. The assembly device for micro motor shaft and yoke according to claim 1, wherein: The mounting portion (61) is provided with a gas passage (681), the first cavity (621) and the second cavity (622) are communicated through the gas passage (681), the gas passage (681) is provided with a gas valve (69) in series, the gas valve (69) can control the on-off of the gas passage (681), and the mounting portion (61) is provided with a second pressure sensor (672), and the detection end of the second pressure sensor (672) is located in the first cavity (621).

6. The assembly device for micro motor shaft and yoke according to claim 1, wherein: The mounting portion (61) is provided with a linear driving mechanism (8), the linear driving mechanism (8) can abut against the piston rod (65) and drive the piston rod (65) to reset.

7. A process for assembling a rotor shaft and a magnetic yoke for a micromotor using the assembly device of claim 6, characterized in that: The method comprises the following steps: S1, the magnetic yoke (2) is installed on the magnetic yoke tooling (4), the rotating shaft (1) is fixed on the mounting surface (32) by the suction accessory (35), and the installation of the rotating shaft (1) and the rotating shaft tooling (3) is completed; S2, the rotating shaft (1) is aligned with the magnetic yoke (2), the positioning pin (351) is aligned with the positioning groove (44), the rotating shaft (1) is inserted into the magnetic yoke (2) by driving the driving assembly (5), and the positioning pin (351) is inserted into the positioning groove (44); S3, the driving assembly (5) continues to push the mounting portion (61) to move towards the magnetic yoke (2), so that the pressure difference ΔP between the first cavity (621) and the second cavity (622) increases to ΔPg, and at this time, the piston rod (65) is subjected to an axial thrust Fg, the rotating shaft (1) is inserted and installed into the magnetic yoke (2); S4, the rotating shaft (1) is separated from the rotating shaft tooling (3), the piston rod (65) is driven to reset by the linear driving mechanism (8), and the rotating shaft tooling (3) is reset by the piston rod (65).

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