Rotor assembly and motor

Abstract

The utility model discloses a rotor assembly and a motor. The rotor assembly comprises a rotor shaft; the locking ring is sleeved on the rotor shaft; the connecting piece comprises a first key and a second key; wherein the first key is embedded in the outer surface of the rotor shaft, and the second key is embedded in the inner surface of the lock ring; the first key comprises a first slope, the second key comprises a second slope, and the first slope and the second slope have the same gradient; the second inclined surface and the first inclined surface are oppositely arranged in the radial direction of the locking ring, and part of the second inclined surface and part of the first inclined surface abut against each other; and the first inclined surface and the second inclined surface are in a downhill shape along the direction of pressing the locking ring into the rotor shaft. The locking ring locking device has a locking ring locking function, and can reduce the magnitude of interference between the locking ring and the rotor shaft, thereby reducing the press-fitting torque for mounting the locking ring, and lowering the requirements on equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, in particular to a rotor assembly and motor. BACKGROUND

[0002] The motor is an electromagnetic device for realizing electric energy conversion or transmission according to electromagnetic induction law, and the motor is composed of a rotor and a stator, the rotor includes a plurality of laminations, and the laminations support a central hub and a plurality of magnets. The existing lamination is fixed to the rotor shaft in a manner of mostly adopting a lock ring, the lock ring is a part for locking the lamination and the end cover in the rotor assembly, and is usually locked by interference fit or connected by a bolt, however, the interference fit locking is installed by cold pressing process, and has the ability to resist the pushing force of the lamination, and is high in interference amount and processing error. SUMMARY

[0003] The utility model discloses a rotor assembly and motor, have the function of lock ring anti-loose, and can reduce the interference amount between the lock ring and the rotor shaft, thereby reducing the pressing torque of the lock ring installation, and reducing the requirement to the equipment.

[0004] To solve the above technical problems, the embodiment of the utility model discloses a kind of rotor assemblies, comprising: rotor shaft;Lock ring, it is set to the rotor shaft;Connecting piece, including first key and second key;Wherein, the first key is embedded in the outer surface of the rotor shaft, and the second key is embedded in the inner surface of the lock ring;The first key includes first slope, and the second key includes second slope, and the first slope and the second slope are same in gradient;The second slope and the first slope are oppositely arranged along the radial direction of the lock ring, and part of the second slope and the first slope is abutted;In the direction of the lock ring pressure into the rotor shaft, the first slope and the second slope are all downhill.

[0005] The first key is embedded on the outer surface of the rotor shaft, the second key is embedded on the inner surface of the lock ring, and the lock ring is sleeved on the rotor shaft, and the second slope and a part of the first slope are in contact and abutment. In the direction of pressing the lock ring into the rotor shaft, the first slope and the second slope are both downhill, and in the loosening direction of the lock ring, the first slope and the second slope are uphill. When the lock ring moves in the loosening direction, the second key embedded on the lock ring moves, the second slope moves uphill on the first slope, at this time, the overall thickness of the first key and the second key overlapping together becomes thicker, and the space formed between the lock ring and the rotor shaft for accommodating the second key and the first key does not change in size, so the first key and the second key are squeezed more and more tightly, the interference between them increases, and the lock ring is difficult to move in the loosening direction, thereby effectively preventing the lock ring from loosening and falling off.

[0006] In summary, the connecting piece of the embodiment has a lock ring anti-loosening function, can prevent the pre-tightening force from decaying due to the deformation of the laminated sheet, and can reduce the interference between the lock ring and the rotor shaft compared with the interference fit locking mode in the prior art, thereby reducing the press-fitting torque of the lock ring installation and the requirements on the equipment.

[0007] According to another specific embodiment of the present application, the slope of the first slope and the second slope ranges from 1:90 to 1:120.

[0008] According to another specific embodiment of the present application, the slope of the first slope and the second slope is 1:100.

[0009] According to another specific embodiment of the present application, the rotor assembly includes two groups of the connecting pieces, each group of the connecting pieces includes the first key and the second key, and the two groups of the connecting pieces are arranged at an interval of 120° to 130° along the circumference of the lock ring.

[0010] According to the above technical solution, the two groups of connecting pieces are arranged at an interval of 120° to 130°, which can enhance the strength and reliability of the lock ring locking.

[0011] According to another specific embodiment of the present application, the rotor shaft includes a mounting portion and an extension portion connected together, the radial dimension of the mounting portion is greater than the radial dimension of the extension portion, and the lock ring is sleeved on the mounting portion; a first groove is formed in the outer surface of the mounting portion, the first groove extends to a certain distance along the axial direction of the rotor shaft from the end of the mounting portion, and the first key is embedded in the first groove; a second groove is formed in the inner surface of the lock ring along the axial direction thereof, and the second key is embedded in the second groove.

[0012] According to another specific embodiment of the present application, the groove walls of the first groove and the second groove are both flat.

[0013] According to another specific embodiment of the present application, the first key is in interference fit with the first slot.

[0014] According to the above technical solution, the first key is in interference fit with the first slot, thereby ensuring the relative fixation of the position of the first key to facilitate the interaction with the second key.

[0015] According to another specific embodiment of the present application, the second key is in interference fit with the second slot.

[0016] According to the above technical solution, the second key is in interference fit with the second slot, thereby facilitating the synchronous movement of the second key driven by the movement of the lock ring.

[0017] According to another specific embodiment of the present application, the rotor assembly further comprises: a rotor lamination set comprising a plurality of laminations, the plurality of laminations being arranged in stack along the axial direction thereof, the rotor lamination set being sleeved on the rotor shaft; two end covers being sleeved on the rotor shaft, and the two end covers being respectively located at the two axial ends of the rotor lamination set; the rotor shaft further comprising a shaft shoulder, along the axial direction of the rotor shaft, the two end covers being located between the shaft shoulder and the lock ring, and the shaft shoulder and the lock ring pressing the two end covers and the rotor lamination set located between the two end covers.

[0018] The embodiment of the present application further discloses a motor based on the rotor assembly in any of the above embodiments, comprising: the above rotor assembly. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A perspective view of the rotor assembly of the embodiment of the present application is shown Figure 1 ;

[0020] Figure 2 A sectional view of the rotor assembly of the embodiment of the present application is shown

[0021] Figure 3 A partial enlarged view of the A area of the embodiment of the present application is shown Figure 2

[0022] Figure 4 An exploded view of a set of connecting members of the embodiment of the present application is shown

[0023] Figure 5 A perspective view of the rotor shaft of the embodiment of the present application is shown

[0024] Figure 6 A perspective view of the lock ring of the embodiment of the present application is shown

[0025] Figure 7 A schematic view of the cooperation of the connecting member with the lock ring and the rotor shaft of the embodiment of the present application is shown ​

[0026] Figure 8 A three-dimensional view of a rotor assembly of the present application is shown Figure 2 . DETAILED DESCRIPTION

[0027] The above description merely represents the embodiment of the present application. The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. Although the present application is described in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of describing the present application in combination with the embodiments is to cover other alternatives or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] In the description of the present embodiments, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] The terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present embodiments, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiments can be understood according to the specific circumstances.

[0032] In order to make the purpose, technical scheme and advantages of the utility model clearer, the embodiments of the utility model will be described in further detail below with reference to the drawings.

[0033] Reference Figure 1 The embodiments of the present application provide a motor, which comprises a rotor assembly 1, the rotor assembly 1 comprising a rotor shaft 2, two end covers 3, a rotor lamination set 4, a lock ring 5 and a connecting piece 6. Wherein, the two end covers 3, the lock ring 5 and the laminations 40 of the rotor lamination set 4 are all sleeved on the rotor shaft 2, and the two end covers 3 are respectively located at the two ends of the rotor lamination set 4 in the axial direction Z. The rotor shaft 2 comprises a shaft shoulder 20, and along the axial direction Z of the rotor shaft 2, the two end covers 3 are located between the shaft shoulder 20 and the lock ring 5, the shaft shoulder 20 and the lock ring 5 press the two end covers 3 and the laminations 40 located between the two end covers 3. And the connecting piece 6 is used for locking the lock ring 5 on the rotor shaft 2, so as to avoid the lock ring 5 from loosening on the rotor shaft 2, which causes the end cover 3 and the rotor lamination set 4 to be unable to be locked on the rotor shaft 2, thereby affecting the normal work of the motor.

[0034] The specific structure of the connecting piece 6 will be described in detail below with reference to the drawings.

[0035] Specifically, as shown in Figures 2 to 4 The connecting piece 6 comprises a first key 61 and a second key 62; wherein the first key 61 is embedded on the outer surface of the rotor shaft 2, and the second key 62 is embedded on the inner surface of the lock ring 5.

[0036] As shown in Figure 3 And Figure 5 In the embodiment, the rotor shaft 2 comprises a mounting portion 22 and an extension portion 23 connected with each other, wherein the radial dimension of the mounting portion 22 is greater than that of the extension portion 23, and the mounting portion 22 is used for mounting the rotor lamination set 4, the end cover 3 and the lock ring 5. The lock ring 5 is sleeved on the mounting portion 22, and the outer surface of the mounting portion 22 is provided with a first groove 21, the first groove 21 extends from the end of the mounting portion 22 to a certain distance along the axial direction Z of the rotor shaft 2, so as to facilitate the embedding of the first key 61 into the first groove 21 from the end of the mounting portion 22 (i.e. the opening of the first groove 21), and the first key 61 is in interference fit with the first groove 21, thereby ensuring the relative fixation of the position of the first key 61, so as to interact with the second key 62.

[0037] Exemplarily, the first groove 21 is a rectangular recess formed by concavely setting a certain distance on the outer surface of the rotor shaft 2 along the radial direction of the rotor shaft 2, and for the convenience of processing, the groove wall (including the groove bottom wall and the groove side wall) of the first groove 21 is all a plane. Those skilled in the art can understand that in other embodiments, the groove bottom wall and the groove side wall of the first groove 21 can also be provided in other shapes, such as circular arc shape, etc.

[0038] Correspondingly, as shown in Figure 3 AndFigure 6 As shown, the inner surface of the locking ring 5 is provided with a second slot 50 along the axial direction Z of the locking ring 5, so as to facilitate the second key 62 to slide into the locking ring 5 along the axial direction Z of the locking ring 5, and be embedded in the second slot 50, and the second key 62 is in interference fit with the second slot 50, so as to facilitate the locking ring 5 to move and drive the second key 62 to move synchronously.

[0039] Exemplarily, the second slot 50 is a rectangular groove formed by concavely setting the inner surface of the locking ring 5 along the radial direction X at a certain distance. In order to facilitate processing, the slot wall (including the slot bottom wall and the slot side wall) of the second slot 50 is a plane. Those skilled in the art can understand that in other embodiments, the slot bottom wall and the slot side wall of the second slot 50 can also be provided in other shapes, such as circular arc shape, etc.

[0040] As shown in Figure 4 and Figure 5 , the first key 61 includes a first inclined surface 610, and the second key 62 includes a second inclined surface 620, and the first inclined surface 610 and the second inclined surface 620 have the same slope; the second inclined surface 620 and the first inclined surface 610 are oppositely and parallelly arranged along the radial direction X of the locking ring 5, and a part of the second inclined surface 620 and the first inclined surface 610 abut. Exemplarily, the first key 61 includes a first plane 611, the first plane 611 and the first inclined surface 610 are oppositely arranged, and the first plane 611 abuts the slot bottom wall of the first slot 21. Correspondingly, the second key 62 includes a second plane 621, the second plane 621 and the second inclined surface 620 are oppositely arranged, and the second plane 621 abuts the slot bottom wall of the second slot 50.

[0041] As shown in Figure 2 , Figure 3 and Figure 7 , along the direction in which the locking ring 5 is pressed into the rotor shaft 2 (indicated by direction M in Figure 7 ), the first inclined surface 610 and the second inclined surface 620 are both downwardly sloped. Exemplarily, the cross section of the first key 61 and the second key 62 are both trapezoidal.

[0042] It is easy to understand that the direction in which the locking ring 5 is pressed into the rotor shaft 2 (indicated by direction M in Figure 7 ) is the direction in which the locking ring 5 is locked, and vice versa, that is, the direction in which the locking ring 5 is loosened (indicated by direction N in Figure 7 ) is the reverse direction. That is, along the direction in which the locking ring 5 is loosened (indicated by direction N in Figure 7As shown in the N direction, the first inclined plane 610 and the second inclined plane 620 are uphill. When the locking ring 5 moves along its loosening direction, the second key 62 embedded in the locking ring 5 moves accordingly. The second inclined plane 620 moves uphill on the first inclined plane 610. At this time, the overall thickness of the first key 61 and the second key 62 overlapping together increases, while the size of the space formed between the locking ring 5 and the rotor shaft 2 to accommodate the second key 62 and the first key 61 remains unchanged. As a result, the first key 61 and the second key 62 are squeezed tighter and tighter, and the interference between them increases, making it difficult for the locking ring 5 to move along its loosening direction. This effectively prevents the locking ring 5 from loosening and falling off, thus avoiding affecting the position of the end cover 3 and the rotor lamination group 4.

[0043] Using the above technical solution, the first key 61 is embedded in the outer surface of the rotor shaft 2, and the second key 62 is embedded in the inner surface of the locking ring 5. The locking ring 5 is sleeved on the rotor shaft 2, and a portion of the second inclined surface 620 and the first inclined surface 610 with the same slope are attached and abutted together. Along the direction in which the locking ring 5 is pressed into the rotor shaft 2 ( Figure 7 As shown in the M direction), both the first inclined plane 610 and the second inclined plane 620 are downward slopes, so along the loosening direction of the locking ring 5 ( Figure 7 As shown in the N direction, the first inclined plane 610 and the second inclined plane 620 are uphill. When the locking ring 5 moves along its loosening direction, the second key 62 embedded in the locking ring 5 moves accordingly. The second inclined plane 620 moves uphill on the first inclined plane 610. At this time, the overall thickness of the first key 61 and the second key 62 overlapping together increases, while the size of the space formed between the locking ring 5 and the rotor shaft 2 to accommodate the second key 62 and the first key 61 remains unchanged. As a result, the first key 61 and the second key 62 are squeezed tighter and tighter, and the interference between them increases, making it difficult for the locking ring 5 to move along its loosening direction. This effectively prevents the locking ring 5 from loosening and falling off, thus avoiding affecting the position of the end cover 3 and the rotor lamination group 4.

[0044] In summary, the connector 6 in this embodiment has a locking ring 5 anti-loosening function, which can prevent the preload from decreasing due to the deformation of the rotor lamination group 4. Compared with the interference fit locking method in the existing embodiment, it can reduce the interference between the locking ring 5 and the rotor shaft 2, thereby reducing the pressing torque of the locking ring 5 and reducing the requirements on the equipment.

[0045] In some possible implementations, such as Figure 1 , Figure 4 and Figure 8As shown, the rotor assembly 1 comprises two groups of connectors 6, each group of connectors 6 comprising a first key 61 and a second key 62, and the two groups of connectors 6 are arranged at an interval of 120° to 130° along the circumferential direction R of the lock ring 5. In the embodiment, the two groups of connectors 6 are arranged at an interval of 120°, which can enhance the strength and reliability of the locking of the lock ring 5. Those skilled in the art can understand that, in other embodiments, the two groups of connectors 6 can also be arranged at an interval of 125°, 130°, etc.

[0046] Further, the slope of the first slope 610 of the first key 61 and the second slope 620 of the second key 62 of each group of connectors 6 in the embodiment is 1:100, that is, the connector 6 in the embodiment is a tangential key.

[0047] Those skilled in the art can understand that, in other embodiments, the connector 6 can also be composed of two other groups of keys, for example, keys having the same structure as the tangential key but different slopes of the first slope 610 and the second slope 620. The slope of the first slope 610 and the second slope 620 can also be 1:90, 1:110, 1:120, etc. Further, the two groups of keys can also be arranged at an interval of 180° in the circumferential direction.

[0048] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple deductions or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. A rotor assembly characterized by, The rotor assembly comprises: a rotor shaft; a lock ring sleeved on the rotor shaft; a connecting piece comprising a first key and a second key; wherein the first key is embedded on the outer surface of the rotor shaft, and the second key is embedded on the inner surface of the lock ring; the first key comprises a first inclined surface, and the second key comprises a second inclined surface, the first inclined surface and the second inclined surface have the same slope; the second inclined surface and the first inclined surface are oppositely arranged along the radial direction of the lock ring, and a part of the second inclined surface and the first inclined surface abut each other; in the direction of pressing the rotor shaft along the lock ring, the first inclined surface and the second inclined surface are both downwardly inclined.

2. The rotor assembly of claim 1, wherein, The slope of the first inclined surface and the second inclined surface ranges from 1:90 to 1:

120.

3. The rotor assembly of claim 2, wherein, The slope of the first inclined surface and the second inclined surface is 1:

100.

4. The rotor assembly of claim 3, wherein, The rotor assembly comprises two groups of connecting pieces, each group of connecting pieces comprises the first key and the second key, and the two groups of connecting pieces are arranged at an interval of 120° to 130° along the circumferential direction of the lock ring.

5. The rotor assembly of claim 1, wherein The rotor shaft comprises a mounting portion and an extension portion connected thereto, the radial dimension of the mounting portion is greater than that of the extension portion, and the lock ring is sleeved on the mounting portion; a first groove is formed on the outer surface of the mounting portion, the first groove extends from the end of the mounting portion to a certain distance along the axial direction of the rotor shaft, and the first key is embedded in the first groove; a second groove is formed on the inner surface of the lock ring along the axial direction thereof, and the second key is embedded in the second groove.

6. The rotor assembly of claim 5, wherein The groove walls of the first groove and the second groove are both flat surfaces.

7. The rotor assembly of claim 6, wherein The first key and the first groove are in interference fit.

8. The rotor assembly of claim 6, wherein, The second key and the second groove are in interference fit.

9. The rotor assembly of claim 1, wherein, Further comprising: a rotor lamination stack comprising a plurality of laminations, the plurality of laminations are arranged in a stacked manner along the axial direction thereof, and the rotor lamination stack is sleeved on the rotor shaft; two end covers sleeved on the rotor shaft, and the two end covers are respectively located at the two ends of the rotor lamination stack in the axial direction; the rotor shaft further comprises a shoulder, along the axial direction of the rotor shaft, the two end covers are located between the shoulder and the lock ring, and the shoulder and the lock ring press the two end covers and the rotor lamination stack located between the two end covers.

10. An electric machine characterized by The rotor assembly comprises: any one of claims 1 to 9.

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