Rotating assembly and motor having the same

Abstract

The present application provides a rotating assembly and a motor having the same, including a shock-absorbing rotor and a rotating shaft. The shock-absorbing rotor includes a shock-absorbing structure; the rotating shaft is in contact with the shock-absorbing structure, and the rotating shaft can drive the shock-absorbing structure to rotate. According to the rotating assembly and the motor having the same of the present application, it is possible to prevent the shock-absorbing structure from cracking during rotation.

Description

Technical Field

[0001] This application belongs to the technical field of motors, and particularly relates to a rotating assembly and a motor having the same. Background Art

[0002] Currently, in order to reduce the vibration of a motor under load, a damping rotor is usually adopted. The damping rotor structure in the prior art generally divides the iron core into an inner iron core and an outer iron core, fills damping rubber between the inner and outer iron cores, and the inner iron core is provided with convex portions that cooperate with the damping rubber. When the motor operates under load, the torque is transmitted to the damping rubber through the inner iron core, and the stress is the greatest at the convex portions, which will cause the extrusion deformation amount at the cooperation between the damping rubber and the convex portions of the inner iron core to be too large. Under long-term high-torque operation, the damping rubber may even crack, resulting in unreliable cooperation between the inner and outer iron cores and relative displacement, which instead increases the vibration and noise of the motor. Moreover, the traditional damping rotor is prone to degumming when subjected to axial force.

[0003] Therefore, how to provide a rotating assembly and a motor having the same that can prevent the damping structure from cracking during rotation has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a rotating assembly and a motor having the same that can prevent the damping structure from cracking during rotation.

[0005] To solve the above problems, this application provides a rotating assembly, including:

[0006] A damping rotor, the damping rotor includes a damping structure;

[0007] And a rotating shaft, the rotating shaft is in contact with the damping structure, and the rotating shaft can drive the damping structure to rotate.

[0008] Further, the damping rotor has a shaft hole, the rotating shaft is arranged in the shaft hole; the damping structure includes a contact area, the contact area is located in the shaft hole, and the rotating shaft and the contact area form a circumferential limit, so that the rotating shaft can drive the contact area to rotate.

[0009] Further, the shaft hole includes an iron core section and a damping section arranged in sequence along the axial direction of the rotating shaft; the damping rotor further includes an inner iron core, and an iron core hole is arranged on the inner iron core, and the iron core hole forms the iron core section, and the rotating shaft and the inner iron core form a circumferential limit in the iron core section; the contact area has an annular surface extending circumferentially around the rotating shaft, and the annular surface forms the damping section, and the rotating shaft and the contact area form a circumferential limit in the damping section.

[0010] Further, the inner iron core includes a first inner iron core and a second inner iron core, the first inner iron core and the second inner iron core are arranged in sequence along the axial direction of the rotating shaft, and the contact area is located between the first inner iron core and the second inner iron core.

[0011] Further, an annular boss extending circumferentially around the rotating shaft is provided on the rotating shaft. The inner iron core is disposed on one axial side of the annular boss, and the annular boss and the contact area form a circumferential limit.

[0012] Further, the damping rotor further includes an outer iron core, and the damping structure further includes a damping area; the damping area is disposed between the outer iron core and the inner iron core. A first protrusion is provided on the outer peripheral wall of the inner iron core, and a first groove adapted to the first protrusion is provided on the inner peripheral wall of the damping area.

[0013] Further, the outer iron core includes a plurality of iron core portions arranged circumferentially around the rotating shaft, and a magnet groove is formed between two adjacent iron core portions; the iron core portions include a first iron core portion and a second iron core portion arranged alternately. A radial limiting member is provided on the inner circumferential side of the first iron core portion, and the radial limiting member extends to both circumferential sides of the first iron core portion.

[0014] Further, the first protrusion and the radial limiting member are arranged offset in the circumferential direction of the rotating shaft.

[0015] Further, the damping structure further includes two connecting portions and a damping column. The two connecting portions are respectively connected to the two axial ends of the damping area. The damping column extends from one axial end of the damping area to the other end, and the damping column is connected to both connecting portions; an axially extending filling hole is provided on the outer iron core, and the damping column is disposed in the filling hole.

[0016] According to another aspect of the present application, a motor is provided, including a rotating assembly, and the rotating assembly is the above-mentioned rotating assembly.

[0017] For the rotating assembly provided by the present application and the motor having the same, during the rotation of the rotating shaft in the present application, the rotating shaft can directly drive the damping structure to rotate, thereby preventing the excessive extrusion deformation at the joint between the damping structure and the inner iron core, and preventing the problem of cracking of the damping structure and the phenomenon of degumming of the damping structure during long-term high-torque operation. The present application can prevent the damping structure from cracking during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic installation structure diagram of the rotating assembly according to an embodiment of the present application;

[0019] Figure 2 is a cross-sectional view of the rotating assembly according to an embodiment of the present application;

[0020] Figure 3 is a schematic installation structure diagram of the outer iron core and the inner iron core according to an embodiment of the present application;

[0021] Figure 4 is a schematic structure diagram of the damping structure according to an embodiment of the present application;

[0022] Figure 5Top view of the rotating component according to an embodiment of the present application;

[0023] Figure 6 Structural schematic diagram of the rotating component according to an embodiment of the present application.

[0024] The reference numerals are shown as:

[0025] 1, damping rotor; 11, damping structure; 111, first groove; 112, connecting portion; 113, damping column; 114, second protrusion; 115, third groove; 116, damping structure positioning hole; 12, inner iron core; 121, first inner iron core; 122, second inner iron core; 123, first protrusion; 124, inner iron core positioning hole; 13, outer iron core; 131, first iron core portion; 1311, radial limiting member; 132, second iron core portion; 133, filling hole; 134, outer iron core positioning hole; 14, shaft hole; 141, iron core section; 142, damping section; 2, rotating shaft; 21, annular boss; 211, second groove; 3, injection molded part; 31, injection molded cylinder; 32, third protrusion; 33, injection molded positioning hole; 4, permanent magnet. Detailed implementation manners

[0026] Referring to Figure 1-6 As shown, a rotating component includes a damping rotor 1 and a rotating shaft 2. The damping rotor 1 includes a damping structure 11. The rotating shaft 2 is in contact with the damping structure 11, and the rotating shaft 2 can drive the damping structure 11 to rotate. During the rotation of the rotating shaft 2, the rotating shaft 2 can directly drive the damping structure 11 to rotate, thereby preventing the excessive extrusion deformation at the mating portion of the damping structure 11 and the inner iron core 12. Under long-term high-torque operation, the problem of cracking of the damping structure 11 can be avoided, and the phenomenon of debonding of the damping structure 11 can also be prevented. The damping structure 11 is made of damping rubber. The damping rubber material can be selected from one of ethylene propylene diene monomer (EPDM), silicone rubber, and neoprene. The present application can solve the problems of excessive extrusion deformation and cracking of the damping rubber of the damping rotor 1; reduce magnetic leakage and increase the power density of the motor; enhance the tangential and axial strength of the damping rotor 1; and reduce the rotor material cost.

[0027] The present application also discloses some embodiments. The damping rotor 1 has a shaft hole 14, and the rotating shaft 2 is arranged in the shaft hole 14. The damping structure 11 includes a contact area, and the contact area is located in the shaft hole 14. The rotating shaft 2 forms a circumferential limit with the contact area, so that the rotating shaft 2 can drive the contact area to rotate. During the rotation of the rotating shaft 2, the rotating shaft 2 can directly drive the damping structure 11 to rotate, thereby preventing the excessive extrusion deformation at the mating portion of the damping structure 11 and the inner iron core 12. Under long-term high-torque operation, the problem of cracking of the damping structure 11 can be avoided, and the phenomenon of debonding of the damping structure 11 can also be prevented.

[0028] The present application also discloses some embodiments. The shaft hole 14 includes a core section 141 and a shock-absorbing section 142 that are sequentially arranged in the axial direction of the rotating shaft 2; the shock-absorbing rotor 1 further includes an inner core 12, and a core hole is provided on the inner core 12, and the core hole forms the core section 141. The rotating shaft 2 and the inner core 12 are circumferentially limited in the core section 141; that is, the rotating shaft 2 and the core section 14 are circumferentially limited to each other, and the two will not generate relative movement in the circumferential direction. When the rotating shaft 2 rotates, it can drive the inner core 12 to rotate. The contact area has an annular surface extending circumferentially around the rotating shaft 2, and the annular surface forms the shock-absorbing section 142. The rotating shaft 2 and the contact area are circumferentially limited in the shock-absorbing section 142. That is, a part of the inner wall of the shaft hole 14 is formed by the inner core 12, and a part is formed by the shock-absorbing structure 11. Then, a part of the rotating shaft 2 is in direct contact with the inner core 12 to drive the inner core 12 to rotate, and a part of the rotating shaft 2 is in contact with the contact area of the shock-absorbing structure 11 and drives the shock-absorbing structure 11 to rotate. It can not only effectively drive the core to rotate, but also reduce the problem of large deformation at the joint between the shock-absorbing structure 11 and the inner core 12, solve the problem of cracking of the shock-absorbing structure 11, and prevent the phenomenon of degumming of the shock-absorbing structure 11; it is equivalent to using the shock-absorbing structure 11 to replace a part of the inner core 12 of the rotor. The material cost of the shock-absorbing rubber is lower than that of the silicon steel sheet of the same volume, so the cost of the rotor is reduced. Holes can also be opened on the inner core 12, and the contact area extends from the hole to the inner circumferential side of the inner core 12, contacts the rotating shaft 2, and is driven to rotate by the rotating shaft.

[0029] The present application also discloses some embodiments. The inner core 12 includes a first inner core 121 and a second inner core 122. The first inner core 121 and the second inner core 122 are sequentially arranged in the axial direction of the rotating shaft 2, and the contact area is located between the first inner core 121 and the second inner core 122. That is, the inner core 12 of the shock-absorbing rotor 1 adopts a layered structure and is divided into two layers. That is, a layer of shock-absorbing structure 11, that is, the contact area, is filled between the two inner cores 12. Filling the shock-absorbing structure 11 between the two inner cores 12 can reduce the torsional force of the first protrusion 123 on the inner circumferential side of the first groove 111 of the shock-absorbing structure 11. The shock-absorbing structure 11 is also filled between the two inner cores 12. The axial thickness of the contact area can be set to 30% - 50% of the axial height of the outer core 13. Three to six second protrusions 114 are arranged at the inner circle of the contact area, and the second protrusions 114 cooperate with the same number of second grooves 211 on the rotating shaft 2. This can make the shock-absorbing structure 11 directly cooperate with the rotating shaft 2, so that a part of the torsional force directly acts on the shock-absorbing structure 11, reduce the stress concentration of the first protrusion 123 on the first groove 111, and prevent the shock-absorbing structure 11 from cracking due to excessive stress. The second groove 211 is a flat groove. The present application uses shock-absorbing glue to replace a part of the inner core 12. The material cost of the shock-absorbing glue is lower than that of the iron core material of the same volume, so the material cost of the rotor is reduced; at the same time, subtracting a part of the inner core 12, that is, reducing the path of magnetic leakage, so the power density of the motor is also increased.

[0030] The rotating component of the present application further includes an injection molded part 3, and the injection molded part 3 can be made of PBT or PA66 material, and an appropriate amount of glass fiber is added to the material to increase the strength; a third protrusion 32 is provided on the injection molded part 3, and the number of the third protrusions 32 is half of the number of the iron core parts. The third protrusion 32 is arranged between the adjacent first iron core part 131 and the second iron core part 132, that is, the position of the third protrusion 32 corresponds to the position of the radial limiting part 1311. The third protrusion 32 cooperates with the third groove 115 on the damping structure 11 to ensure that the damping structure 11 and the injection molded part 3 rotate synchronously. The radius of the third protrusion 32 is 0.5 - 1.5 mm less than the radius of the first protrusion 123. Since both of them are made of hard materials and the material between them is an elastic material, this can increase the tangential strength of the rotor and prevent excessive tangential displacement. In order to prevent the third groove 115 on the damping structure 11 from being deformed and stressed due to the torsional force of the third protrusion 32, a damping column 113 is filled in the filling hole 133 of the outer iron core 13 to enhance the overall strength of the damping rotor 1. The injection molded part 3 further includes an injection molded cylinder 31.

[0031] The present application also discloses some embodiments. An annular boss 21 extending circumferentially around the rotating shaft 2 is provided on the rotating shaft 2, and the inner iron core 12 is arranged on one axial side of the annular boss 21. The annular boss 21 forms a circumferential limit with the contact area, that is, the shaft is designed as a stepped shaft to ensure the shaft entry dimensions of the two inner iron cores 12. The first inner iron core 121 is arranged on the first axial side of the annular boss 21, and the second inner iron core 122 is arranged on the second axial side of the annular boss 21. Contact areas are provided at corresponding positions of the annular boss 21. The inner iron core 12 of the damping rotor 1 adopts a layered structure, and a layer of damping rubber is filled between the inner iron cores 12. A second protrusion 114 is provided at the inner circle of this layer of damping rubber, and a flat groove, that is, a second groove 211, is provided on the shaft and directly cooperates with the second protrusion 114, so that a part of the torsional force directly drives the damping rubber to rotate. This can reduce the extrusion of the inner iron core 12 on the damping rubber, thereby reducing the stress on the damping rubber and preventing the damping rubber from cracking. At the same time, both end faces of this layer of damping rubber and the damping rubber can increase the axial strength of the rotor and prevent the phenomenon of glue separation.

[0032] The present application also discloses some embodiments. The damping rotor 1 further includes an outer iron core 13, and the damping structure 11 further includes a damping area; the damping area is arranged between the outer iron core 13 and the inner iron core 12. A first protrusion 123 is provided on the outer peripheral wall of the inner iron core 12, and a first groove 111 adapted to the first protrusion 123 is provided on the inner peripheral wall of the damping area. The cooperation between the first protrusion 123 and the first groove 111 can ensure that the inner iron core 12 and the damping structure 11 rotate synchronously.

[0033] The present application also discloses some embodiments, the outer core 13 includes a plurality of core parts arranged circumferentially around the rotating shaft 2, and a magnetic steel groove is formed between two adjacent core parts; the core parts include a first core part 131 and a second core part 132 arranged alternately, and a radial stopper 1311 is provided on the inner circumference of the first core part 131, and the radial stopper 1311 extends to both circumferential sides of the first core part 131. The cross section of the radial stopper 1311 is triangular, half of the core parts are provided with axial stoppers to form the first core part 131, and the other half of the core parts are not provided with radial stoppers 1311 to form the second core part 132, and the first core part 131 and the second core part 132 are placed at intervals, which can play the role of limiting the magnetic steel 4 and preventing this part of the outer core 13 from detaching. The radial limiting member 1311 can limit the magnetic steel 4 and also enhance the structural strength of the outer core 13. The number of the first protrusions 123 on the inner core 12 is half of that on the core part.

[0034] The present application also discloses some embodiments, in which the first protrusion 123 and the radial stopper 1311 are staggered in the circumferential direction of the rotating shaft 2. The radial stopper 1311 of the outer core 13 is staggered with the first protrusion of the inner core 12, so that the distance between the inner and outer cores 13 is increased. Since a part of the inner core 12 is reduced, the leakage magnetic flux is reduced, thereby increasing the power density of the motor. The first protrusion 123 is staggered with the radial stopper 1311, that is, the first protrusion 123 is aligned with the second core part 132 without the first protrusion. This position can ensure that the distance between the outer core 13 and the inner core 12 is large enough, reducing the leakage magnetic flux generated by the magnetic flux lines passing through the inner core 12, thereby increasing the power density of the motor.

[0035] The present application also discloses some embodiments, the shock absorbing structure 11 also includes two connecting parts 112 and a shock absorbing column 113, the two connecting parts 112 are respectively connected to the axial ends of the shock absorbing zone, the shock absorbing column 113 extends from one axial end of the shock absorbing zone to the other end, and the shock absorbing column 113 is connected to both connecting parts 112; the outer iron core 13 is provided with an axially extending filling hole 133, and the shock absorbing column 113 is arranged in the filling hole 133. The outer iron core 13 is provided with a square hole to form the filling hole 133, which is used for positioning during injection molding and plastic coating to prevent the block-type outer iron core 13 from having a low concentricity problem. The outer iron core 13 is also provided with an outer iron core positioning hole 134, which is a round hole. Plastic coating is injected into the positioning hole of the outer iron core 13 to enhance the strength of the rotor and prevent the block-type outer iron core 13 from being damaged by excessive centrifugal force and causing displacement or even detachment of the plastic coating. This layer of shock-absorbing columns 113 and the two end surfaces of the connecting portion 112 together play a role in enhancing the axial strength of the rotor, preventing the shock-absorbing structure 11 and the inner iron core 12 from axial displacement or debonding. The filling hole 133 is a square hole.

[0036] The production process of the vibration-absorbing rotating assembly of this application is as follows:

[0037] ①Stack the outer iron core 13 and the inner iron core 12: The iron core is formed by laminating punching sheets through snap points. The punching sheets are 0.5 mm silicon steel sheets;

[0038] ②Position the outer iron core 13 and the permanent magnet 4: The outer iron core 13 is positioned tangentially and radially by the filling holes 133; The injection molding positioning holes 33 are for the axial positioning of the outer iron core 13, and the permanent magnet 4 is positioned by the position of the outer iron core 13 and the radial limiting member 1311;

[0039] ③Inject plastic to encapsulate;

[0040] ④Press the inner iron core 12 into the rotating shaft 2: The rotating shaft 2 is designed as a stepped shaft. The height of the annular boss 21 is the interval height between the first inner iron core 121 and the second inner iron core 122, that is, the annular boss 21 ensures the shaft insertion dimensions of the first inner iron core 121 and the second inner iron core 122, and the inner iron core positioning hole 124 ensures the alignment of the two inner iron cores 12;

[0041] ⑤Position the inner iron core 12 and the outer iron core 13: The tangential and radial positioning of the inner iron core 12 is completed by the inner iron core 12 positioning hole and the rotating shaft 2, and the axial positioning is completed by the shock absorption structure 11 positioning hole. The inner iron core 12 positioning hole is aligned with one of the shock absorption structure positioning holes 116 and has a smaller outer diameter, which can complete the positioning of the inner iron core 12 in all directions at the same time. The outer iron core 13 (at this time, the outer iron core 13 has been injection molded with the magnetic tile as a whole) is positioned by the injection molding positioning hole 33 left when injecting plastic to encapsulate;

[0042] ⑥Inject the shock absorption structure 11. The fourth process can be carried out simultaneously with the first to third processes.

[0043] According to an embodiment of the present application, a motor is provided, including a rotating assembly, and the rotating assembly is the above-mentioned rotating assembly.

[0044] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0045] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A rotating assembly, characterized in that, it comprises: a damping rotor (1), the damping rotor (1) comprising a damping structure (11); and a rotating shaft (2), the rotating shaft (2) being in contact with the damping structure (11), and the rotating shaft (2) being capable of driving the damping structure (11) to rotate; the damping rotor (1) has a shaft hole (14), the rotating shaft (2) being disposed within the shaft hole (14); the damping structure (11) comprises a contact area, the contact area being located within the shaft hole (14), the rotating shaft (2) and the contact area forming a circumferential limit such that the rotating shaft (2) can drive the contact area to rotate; the shaft hole (14) comprises a core section (141) and a damping section (142) arranged in sequence in the axial direction of the rotating shaft (2); the damping rotor (1) further comprises an inner core (12), the inner core (12) being provided with a core hole, the core hole forming the core section (141), the rotating shaft (2) and the inner core (12) forming a circumferential limit in the core section (141); the contact area has an annular surface extending circumferentially around the rotating shaft (2), the annular surface forming the damping section (142), the rotating shaft (2) and the contact area forming a circumferential limit in the damping section (142).

2. The rotating assembly according to claim 1, characterized in that, the inner core (12) comprises a first inner core (121) and a second inner core (122), the first inner core (121) and the second inner core (122) being arranged in sequence in the axial direction of the rotating shaft (2), the contact area being located between the first inner core (121) and the second inner core (122).

3. The rotating assembly according to claim 1, characterized in that, the rotating shaft (2) is provided with an annular boss (21) extending circumferentially around the rotating shaft (2), the inner core (12) being disposed on one axial side of the annular boss (21), the annular boss (21) and the contact area forming a circumferential limit.

4. The rotating assembly according to claim 1, characterized in that, the damping rotor (1) further comprises an outer core (13), the damping structure (11) further comprises a damping area; the damping area is disposed between the outer core (13) and the inner core (12), a first protrusion (123) is provided on the outer peripheral wall of the inner core (12), and a first groove (111) adapted to the first protrusion (123) is provided on the inner peripheral wall of the damping area.

5. The rotating assembly according to claim 4, characterized in that, the outer core (13) comprises a plurality of core portions arranged circumferentially around the rotating shaft (2), a magnet (4) slot is formed between adjacent two of the core portions; the core portions comprise a first core portion (131) and a second core portion (132) arranged alternately, a radial limiting member (1311) is provided on the inner circumferential side of the first core portion (131), and the radial limiting member (1311) extends towards the circumferential two sides of the first core portion (131).

6. The rotating assembly according to claim 5, wherein, the first protrusion (123) and the radial limiting member (1311) are arranged offset in the circumferential direction of the rotating shaft (2).

7. The rotating assembly according to claim 4, wherein, the damping structure (11) further includes two connecting portions (112) and a damping column (113). The two connecting portions (112) are respectively connected to the axial two ends of the damping area. The damping column (113) extends from one axial end of the damping area to the other end, and the damping column (113) is connected to both of the two connecting portions (112); an axially extending filling hole (133) is provided on the outer iron core (13), and the damping column (113) is arranged in the filling hole (133).

8. A motor, comprising a rotating assembly, wherein, the rotating assembly is the rotating assembly according to any one of claims 1-7.

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