Deceleration permanent magnet synchronous motor

Abstract

The utility model provides a deceleration permanent magnet synchronous motor, which comprises a shell, a rotor positioned in the shell, a speed reducer connected with the shell and an output shaft arranged between the shell and the speed reducer, and is characterized in that the output shaft comprises a driving part, a transmission part and an extension part which are connected in sequence, the driving part is positioned in the shell and connected with the rotor, and the transmission part is positioned in the shell and connected with the extension part; when the transmission part is located in the speed reducer and meshed with a worm gear in the speed reducer, the extending part penetrates out of the outer side of the speed reducer. In the assembling process, after the transmission part of the output shaft is assembled into the speed reducer and meshed with the worm gear, the extension part abuts against the external tool, and when a rotor and other components are assembled, the output shaft transmits the downward pressure borne by the output shaft to the extension part, so that the extension part transmits the downward pressure borne by the extension part to the external tool; and the internal bearing and the worm gear are prevented from being subjected to downward pressure, so that the bearing and the worm gear are effectively prevented from being damaged when the whole machine is assembled.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a deceleration permanent magnet synchronous motor. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets to provide excitation, making the motor structure simpler and reducing processing and assembly costs. They also eliminate collector rings and brushes that are prone to problems, improving the reliability of motor operation. Because they do not require excitation current and have no excitation loss, they improve the efficiency and power density of the motor. When they are working, they are often used with a worm gear reducer to obtain greater output torque and self-locking characteristics.

[0003] For example, the Chinese patent "CN220190616U" discloses "a kind of deceleration permanent magnet synchronous motor", which uses a common shaft as both the motor shaft and the worm to replace the existing connection structure, thereby avoiding the efficiency reduction caused by the connection structure and improving the heat dissipation efficiency of the permanent magnet synchronous motor. However, during the initial assembly of the above motor, it was found that when the common shaft was assembled into the reducer, the pressure was mainly borne by the bearings and the worm gear. When the rotor and other components were subsequently assembled, the downward pressure would be directly transmitted to the bearings and the worm gear through the common shaft, which could easily cause damage to the bearings and the worm gear, indirectly increasing the cost. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a reduction permanent magnet synchronous motor, which solves the problem in the prior art that when assembling components such as the rotor, the downward pressure applied will be directly transmitted to the bearings and the worm gear through the common shaft, which may easily cause damage to the bearings and the worm gear, and indirectly increase the cost.

[0005] According to the embodiment of the utility model, the utility model adopts the following technical solution:

[0006] A reduction permanent magnet synchronous motor comprises a housing, a rotor located in the housing, a reducer connected to the housing and an output shaft arranged between the housing and the reducer, wherein the output shaft comprises a driving portion, a transmission portion and an extension portion which are connected in sequence, the driving portion is located in the housing and connected to the rotor, the transmission portion is located in the reducer, and when the transmission portion is engaged with a worm gear in the reducer, the extension portion passes through the outside of the reducer.

[0007] Preferably, an adjustment block for adjusting the rotation of the output shaft is fixedly provided at the end of the extension portion.

[0008] Preferably, the adjusting block is a nut.

[0009] Preferably, the driving part is provided with splines corresponding to the rotor.

[0010] Preferably, a flange that is buckled on the reducer is provided at the end of the shell, and both the flange and the reducer are provided with a plurality of mounting holes for bolts to penetrate.

[0011] Preferably, the flange extends outwardly along the axis of the axial hole of the housing to form a sealing portion for mounting a sealing member.

[0012] Preferably, an annular protrusion is provided at one end of the sealing portion close to the inner side of the shell.

[0013] Preferably, an oil seal is provided between the extension portion and the reducer.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the present solution, the output shaft includes a driving portion connected to the rotor, a transmission portion meshing with the worm gear in the reducer, and an extension portion extending out of the reducer. When working, the driving portion rotates to cause the transmission portion to rotate in the reducer, thereby driving the worm gear in the reducer to achieve normal operation. During assembly, when the transmission portion of the output shaft is assembled into the reducer and meshed with the worm gear, the extension portion is abutted against the external tooling. When assembling the rotor and other components, the output shaft transfers the downward pressure it is subjected to to the extension portion, thereby transferring the downward pressure it is subjected to to the external tooling, and the internal bearings and worm gear will not be subjected to downward pressure, thereby effectively preventing damage to the bearings and worm gear during assembly of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the planar structure of an embodiment of the utility model.

[0017] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the reducer in the embodiment of the utility model.

[0018] Figure 3 It is a bottom view structural schematic diagram of the shell in the embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of the structure of the reducer in the embodiment of the utility model when viewed from above.

[0020] In the above drawings: 1. housing; 11. flange; 12. mounting hole; 13. sealing part; 14. annular protrusion; 2. reducer; 3. output shaft; 31. driving part; 32. transmission part; 33. extension part; 34. adjustment block; 35. spline; 4. rotor; 5. oil seal. DETAILED DESCRIPTION

[0021] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1 and Figure 2 As shown, an embodiment of the utility model proposes a reduction permanent magnet synchronous motor, including a shell 1, a rotor 4 located in the shell 1, a reducer 2 connected to the shell 1 and an output shaft 3 arranged between the shell 1 and the reducer 2, the output shaft 3 includes a driving part 31, a transmission part 32 and an extension part 33 connected in sequence, the driving part 31 is located in the shell 1 and connected to the rotor 4, the transmission part 32 is located in the reducer 2, and when engaged with the worm gear in the reducer 2, the extension part 33 passes through the outside of the reducer 2.

[0023] In an embodiment of the utility model, the output shaft 3 includes a driving portion 31 connected to the rotor 4, a transmission portion 32 meshing with the worm gear in the reducer 2, and an extension portion 33 extending out of the reducer 2. When working, the driving portion 31 rotates to make the transmission portion 32 rotate in the reducer 2, thereby driving the worm gear in the reducer 2 to achieve normal operation.

[0024] Secondly, during assembly, the reducer 2 is installed at the bottom and the housing 1 is installed at the top. When the transmission part 32 of the output shaft 3 is assembled into the reducer 2 and meshed with the worm gear, the end of the output shaft 3 (i.e., the extension part 33) at this time extends out of the outside of the reducer 2, and can be abutted against the external tooling to be supported by the external tooling. When assembling components such as the rotor 4, the output shaft 3 transfers the downward pressure it is subjected to to the extension part 33, and the extension part 33 transfers the downward pressure it is subjected to to the external tooling, and the internal bearings and worm gears are not subjected to downward pressure, thereby effectively preventing damage to the bearings and worm gears during assembly of the entire machine and making the entire assembly process more stable.

[0025] Specifically, Figure 1 As shown, an adjustment block 34 for adjusting the rotation of the output shaft 3 is fixedly provided at the end of the extension portion 33. After a power outage, the adjustment block 34 can be clamped by a wrench or other tool, and the adjustment block 34 can be rotated to drive the entire output shaft 3 to rotate, so that the output shaft 3 can be driven to reset after a power outage, which is convenient for use. In order to more conveniently adjust the output shaft 3, the adjustment block 34 is a nut, which can be operated not only with a wrench, but also with a matching nut sleeve, which is more labor-saving and more stable.

[0026] Specifically, Figure 1 As shown, the driving part 31 is provided with a spline 35 corresponding to the rotor 4. When the rotor 4 is installed, the fixed hole of the rotor 4 is sleeved on the driving part 31, and the rotor 4 is continuously pressed down, so that the spline 35 of the driving part 31 squeezes the fixed hole of the rotor 4 to form a groove adapted to the spline 35, which can increase the friction between the rotor 4 and the driving part 31 and effectively improve the transmission efficiency between the two.

[0027] Based on the above scheme, if Figure 3 As shown, the end of the housing 1 is provided with a flange 11 that is buckled with the reducer 2, and the flange 11 and the reducer 2 are both provided with a plurality of mounting holes 12 for bolts to penetrate. With the action of the flange 11, it is convenient to quickly position and assemble the housing 1 on the reducer 2, and the use of one flange 11 can avoid the problem of reduced concentricity of the two flanges 11.

[0028] Specifically, the flange 11 extends outward along the axis of the shaft hole of the housing 1 to form a sealing portion 13 for installing a sealing member. In order to improve the sealing performance, a sealing member needs to be installed at the position of the sealing portion 13 to improve the sealing performance between the output shaft 3 and the housing 1. The sealing member can be an oil seal. Figure 3 As shown, an annular protrusion 14 is provided at one end of the sealing portion 13 close to the inner side of the housing 1. The lubricating oil in the reducer 2 has a certain pressure during operation. In order to prevent the seal from being displaced due to pressure, the seal can be blocked by the annular protrusion 14, so that the seal always abuts against the annular protrusion 14 without displacement, thereby ensuring the sealing performance.

[0029] Specifically, an oil seal 5 is provided between the extension portion 33 and the reducer 2 . Since the extension portion 33 protrudes to the outside of the reducer 2 , the oil seal 5 can improve the sealing performance between the extension portion 33 and the reducer 2 .

[0030] In summary, by improving the structure of the output shaft 3 itself, the driving part 31 of the output shaft 3 and the rotor 4 are used as the driving source, and the driving part 31 has a spline 35 for increasing friction to ensure transmission efficiency, and the extension part 33 of the output shaft 3 extends out of the reducer 2. During the overall assembly, the extension part 33 can be used as a support point. When the output shaft 3 is subjected to force, the force can be transmitted to the support point, so that the bearings and worm gears in the reducer 2 are not subjected to force, thereby ensuring that the bearings and worm gears will not be damaged during the assembly process, thereby ensuring the normal assembly progress.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A reduction permanent magnet synchronous motor, comprising a housing (1), a rotor (4) located in the housing (1), a reducer (2) connected to the housing (1), and an output shaft (3) arranged between the housing (1) and the reducer (2), characterized in that: The output shaft (3) comprises a driving portion (31), a transmission portion (32) and an extension portion (33) which are connected in sequence; the driving portion (31) is located in the housing (1) and is connected to the rotor (4); the transmission portion (32) is located in the reducer (2), and when the transmission portion (32) is meshed with a worm wheel in the reducer (2), the extension portion (33) passes through the outside of the reducer (2).

2. A deceleration permanent magnet synchronous motor according to claim 1, characterized in that: An adjustment block (34) for adjusting the rotation of the output shaft (3) is fixedly provided at the end of the extension portion (33).

3. A deceleration permanent magnet synchronous motor according to claim 2, characterized in that: The adjusting block (34) is a nut.

4. A deceleration permanent magnet synchronous motor according to claim 1, characterized in that: The driving portion (31) is provided with a spline (35) corresponding to the rotor (4).

5. The deceleration permanent magnet synchronous motor according to claim 1, characterized in that: The end of the housing (1) is provided with a flange (11) which is buckled with the reducer (2), and the flange (11) and the reducer (2) are both provided with a plurality of mounting holes (12) for bolts to penetrate.

6. A reduction permanent magnet synchronous motor according to claim 5, characterized in that: The flange (11) extends outwardly along the axis of the shaft hole of the housing (1) to form a sealing portion (13) for mounting a sealing member.

7. A reduction permanent magnet synchronous motor according to claim 6, characterized in that: An annular protrusion (14) is provided at one end of the sealing portion (13) close to the inner side of the housing (1).

8. The reduction permanent magnet synchronous motor according to claim 1, characterized in that: An oil seal (5) is provided between the extension portion (33) and the reducer (2).

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