Rotor assembly and motor

Abstract

The present invention belongs to the field of motor technology and discloses a rotor assembly and a motor. The rotor assembly includes a connecting assembly, which includes a pull rod, a nut, and a first retaining ring. The pull rod includes a head, a screw segment, and a shaft end connected in sequence. The head abuts against an end of the first end cover away from the rotor core to achieve axial limitation of the first end cover. The nut is threadedly connected to the screw segment and abuts against an end of the rotor core close to the second end cover to achieve axial limitation of the rotor core, so that the first end cover and the rotor core are axially fixed and the preload force is easily controlled. On the basis of fastening by the nut, a first retaining ring is also provided. The first retaining ring is interference-fitted with the shaft end and abuts against an end of the second end cover away from the rotor core, thereby achieving axial fixation between the first end cover, the rotor core, and the second end cover. In addition, the rotor core will not be damaged during assembly, and the first retaining ring is not easy to fall off when the rotor assembly rotates at high speed.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor assembly and a motor. Background Art

[0002] In a traditional motor, the rotor core is usually connected to the balance end plate by bolts to achieve axial fixation between the rotor core and the balance end plate. For example, the prior art provides a structure that uses a long screw to achieve axial fixation between the front end plate, the core, and the rear end plate. Specifically, the long screw passes through the front end plate, the core, and the rear end plate in sequence, and then passes out from the rear end plate. The protruding part cooperates with the nut, and the axial fixation can be achieved by tightening the nut. However, there is a problem that when the rotor rotates at high speed, it is easy for the nut to loosen or even fall off, causing the connection between the rotor core and the balance end plate to fail. If the screw and nut are directly replaced with an interference fit shaft and retaining ring, although the retaining ring is not easy to fall off when the rotor rotates at high speed, it may damage the rotor core during the press-fitting process, and it is difficult to control the preload force between the rotor core and the balance end plate. Summary of the Invention

[0003] According to one aspect of the present invention, the present invention provides a rotor assembly to solve the problem in the prior art that when the rotor rotates at high speed, the nut is easily loosened or even falls off, and if it is directly replaced with a shaft and a retaining ring, it is difficult to control the preload force.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The rotor assembly includes a rotating shaft and a first end cover, a rotor core, and a second end cover which are sleeved on the rotating shaft and abutted in sequence along the axial direction of the rotating shaft. The rotor core can drive the rotating shaft to rotate.

[0006] Also included is a connection assembly, the connection assembly comprising:

[0007] A pull rod comprising a head, a screw segment and a shaft end connected in sequence, wherein the head abuts against an end of the first end cover away from the rotor core;

[0008] a nut, threadedly connected to the screw segment and abutting against an end of the rotor core close to the second end cover;

[0009] The first retaining ring is interference-fitted with the shaft end and abuts against an end of the second end cover away from the rotor core.

[0010] As a preferred solution of the rotor assembly, the second end cover has a first accommodating groove, and the nut is located in the first accommodating groove.

[0011] As a preferred solution of the rotor assembly, a plurality of the connecting assemblies are provided, and the plurality of connecting assemblies are spaced apart along the circumferential direction of the rotating shaft.

[0012] As a preferred solution of the rotor assembly, a stop block is protruding from the outer peripheral wall of the rotating shaft, and the connecting assembly also includes a second stop ring, which is interference fit with the rotating shaft, and the first end cover, the rotor core and the second end cover are all arranged between the stop block and the second stop ring, and one of the stop block and the second stop ring abuts against the first end cover along the axial direction of the rotating shaft, and the other abuts against the second end cover along the axial direction of the rotating shaft.

[0013] As a preferred solution of the rotor assembly, the second end cover has a second accommodating groove, and the second retaining ring is located in the second accommodating groove and abuts against the bottom wall of the second accommodating groove.

[0014] As a preferred solution of the rotor assembly, the first end cover has a third accommodating groove, the stop block is located in the third accommodating groove and abuts against the bottom wall of the third accommodating groove.

[0015] As a preferred solution of the rotor assembly, the rotating shaft has an output shaft mounting groove, the output shaft mounting groove is used to mount the output shaft of the motor, and the rotating shaft can drive the output shaft to rotate synchronously.

[0016] As a preferred solution of the rotor assembly, the outer diameters of the first end cover, the rotor core and the second end cover are equal.

[0017] As a preferred solution of the rotor assembly, the rotor core and the rotating shaft are interference fit.

[0018] According to another aspect of the present invention, a motor is provided, comprising the above-mentioned rotor assembly.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a rotor assembly, which includes a rotating shaft, a first end cover, a rotor core, and a second end cover. The rotor core can drive the rotating shaft to rotate, thereby driving the output shaft of the motor to rotate to achieve basic motor driving functions. In addition, it also includes a connecting assembly, which includes a pull rod, a nut, and a first retaining ring. The pull rod includes a head, a screw segment, and a shaft end connected in sequence. The head abuts against an end of the first end cover away from the rotor core to achieve axial limitation of the first end cover. The nut is threadedly connected to the screw segment and abuts against an end of the rotor core near the second end cover to achieve axial limitation of the rotor core, so that the first end cover and the rotor core are fixed axially, and the preload force is easily controlled by the threaded connection. On the basis of fastening with a nut, a first retaining ring is also provided. The first retaining ring is interference fit with the shaft end and abuts against the end of the second end cover away from the rotor core, thereby realizing axial fixation between the first end cover, the rotor core and the second end cover. In addition, the connection is completed by the interference fit between the first retaining ring and the shaft end, and the first retaining ring abuts against the second end cover. The rotor core will not be damaged during the assembly process, and the interference fit is adopted. When the rotor assembly rotates at high speed, the first retaining ring is not easy to fall off, and the connection is stable.

[0021] The present invention also provides a motor, including the above-mentioned rotor assembly. When the rotor assembly rotates at high speed, the first retaining ring is not easy to fall off, the connection is stable, and it is easy to control the preload force between the first end cover and the rotor core, thereby making the overall connection structure of the motor stable and highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a rotor assembly in an embodiment of the present invention;

[0023] Figure 2 FIG. 4 is an exploded view of a rotor assembly according to an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Rotating shaft; 11. Stop block; 12. Output shaft mounting groove; 121. Internal spline.

[0026] 2. First end cover; 21. Third receiving groove;

[0027] 3. Rotor core;

[0028] 4. Second end cover; 41. First receiving groove; 42. Second receiving groove;

[0029] 5. Tie rod; 51. Head; 52. Screw segment; 53. Shaft end;

[0030] 6. Nut;

[0031] 7. First retaining ring;

[0032] 8. Second retaining ring. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] The prior art provides a structure that uses a long screw to achieve axial fixation between the front end plate, the iron core, and the rear end plate. Specifically, the long screw passes through the front end plate, the iron core, and the rear end plate in sequence, and then comes out from the rear end plate. The protruding part cooperates with a nut, and the axial fixation can be achieved by tightening the nut. However, there is a problem that when the rotor rotates at high speed, it is easy for the nut to loosen or even fall off, causing the connection between the rotor core and the balance end plate to fail. If the screw and nut are directly replaced with a shaft and retaining ring with an interference fit, although the retaining ring is not easy to fall off when the rotor rotates at high speed, it may damage the rotor core during the press-fitting process, and it is difficult to control the preload force between the rotor core and the balance end plate.

[0038] In response to the above problems, this embodiment provides a rotor assembly to solve the problem in the prior art that when the rotor rotates at high speed, the nut is easily loosened or even falls off, and if it is directly replaced with a shaft and a retaining ring, it is difficult to control the preload force. It can be used in the field of motor technology.

[0039] Reference Figure 1-Figure 2 The rotor assembly includes a rotating shaft 1 and a first end cover 2, a rotor core 3 and a second end cover 4 which are sleeved on the rotating shaft 1 and abutted in sequence along the axial direction of the rotating shaft 1. The rotor core 3 can drive the rotating shaft 1 to rotate. Specifically, the rotor assembly is a part of the motor. The rotor core 3 of the rotor assembly can rotate relative to the stator of the motor and drive the rotating shaft 1 to rotate. The rotating shaft 1 is used to drive the output shaft of the motor to rotate to achieve the basic motor driving function. Specifically, the motor also includes a stator, which is used to drive the rotor core 3 to rotate. The rotating shaft 1 is used to connect the output shaft of the motor to output torque. Optionally, the rotor core 3 is assembled from a plurality of segmented cores for ease of manufacturing, or it can be formed in one piece.

[0040] Continue to refer to Figure 1-Figure 2 The rotor assembly also includes a connecting assembly, which includes: a pull rod 5, a nut 6 and a first retaining ring 7. The pull rod 5 includes a head 51, a screw segment 52 and a shaft end 53 connected in sequence. The head 51 abuts against the end of the first end cover 2 away from the rotor core 3. The pull rod 5 passes through the first end cover 2, the rotor core 3 and the second end cover 4 in sequence. The nut 6 is threadedly connected to the screw segment 52 and abuts against the end of the rotor core 3 close to the second end cover 4 to achieve axial limitation of the rotor core 3, so that the first end cover 2 and the rotor core 3 are axially fixed, and the threaded connection facilitates the control of the preload force. In addition, the rotor core 3 is fixed to the first end cover 2 by the pull rod 5. Compared with fixing the rotor core 3 by welding, it can avoid insulation damage between the rotor cores 3 caused by welding and increase eddy current loss between the rotor cores 3.

[0041] Continue to refer to Figure 1-Figure 2On the basis of being fastened by the nut 6, a first retaining ring 7 is also provided. The first retaining ring 7 is interference fit with the shaft end 53 and abuts against the end of the second end cover 4 away from the rotor core 3, thereby realizing axial fixation between the first end cover 2, the rotor core 3 and the second end cover 4. In addition, the connection is completed by the interference fit of the first retaining ring 7 and the shaft end 53, and the first retaining ring 7 abuts against the second end cover 4. The rotor core 3 will not be damaged during the assembly process, and the interference fit is adopted. When the rotor assembly rotates at high speed, the first retaining ring 7 is not easy to fall off, and the connection is stable.

[0042] Optionally, an elastic washer is provided between the nut 6 and the rotor core 3 to prevent the nut 6 from loosening when the rotor assembly rotates at high speed. Alternatively, two nuts 6 are provided, the two nuts 6 abut against each other, and one of the nuts 6 abuts against the rotor core 3 to achieve self-locking.

[0043] Continue to refer to Figure 1-Figure 2 The second end cover 4 has a first accommodating groove 41, and the nut 6 is located in the first accommodating groove 41 to reduce the space occupied by the nut 6, making the appearance of the entire rotor assembly neat, and at the same time protecting the nut 6 and preventing the nut 6 from falling off.

[0044] Continue to refer to Figure 1-Figure 2 There are multiple connecting components, and the multiple connecting components are spaced apart along the circumferential direction of the rotating shaft 1 to improve the stability of the axial limit between the first end cover 2, the rotor core 3 and the second end cover 4.

[0045] Continue to refer to Figure 1-Figure 2 In order to achieve axial positioning between the first end cover 2, the rotor core 3, the second end cover 4, and the connecting assembly and the rotating shaft 1, the rotor assembly of this embodiment adopts the following structure. A stop block 11 is protruding from the outer peripheral wall of the rotating shaft 1. The connecting assembly also includes a second retaining ring 8. The second retaining ring 8 is interference-fitted with the rotating shaft 1. The first end cover 2, the rotor core 3, and the second end cover 4 are all arranged between the stop block 11 and the second retaining ring 8. One of the stop block 11 and the second retaining ring 8 abuts against the first end cover 2 along the axial direction of the rotating shaft 1, and the other abuts against the second end cover 4 along the axial direction of the rotating shaft 1. The axial positioning between the first end cover 2, the rotor core 3, the second end cover 4, and the rotating shaft 1 is achieved by the stop block 11 and the second retaining ring 8.

[0046] Continue to refer to Figure 1-Figure 2 The second end cover 4 has a second accommodating groove 42, the second retaining ring 8 is located in the second accommodating groove 42 and abuts against the bottom wall of the second accommodating groove 42. By setting the second accommodating groove 42, the space occupied by the second retaining ring 8 is saved, making the appearance of the entire rotor assembly neat.

[0047] Continue to refer to Figure 1-Figure 2Similarly, the first end cover 2 has a third accommodating groove 21, the stop block 11 is located in the third accommodating groove 21 and abuts against the bottom wall of the third accommodating groove 21. By setting the third accommodating groove 21, the space occupied by the stop block 11 is saved, and the appearance of the entire rotor assembly is neat.

[0048] Continue to refer to Figure 1-Figure 2 The rotating shaft 1 has an output shaft mounting groove 12 for mounting the motor's output shaft. The rotating shaft 1 is capable of driving the output shaft in synchronous rotation. Specifically, the inner wall of the output shaft mounting groove 12 is provided with an internal spline 121. The output shaft is connected to the rotating shaft 1 via the internal spline 121 and can rotate synchronously with the rotating shaft 1. Alternatively, the connection can be made using a coupling or welding.

[0049] Continue to refer to Figure 1-Figure 2 The outer diameters of the first end cap 2, the rotor core 3, and the second end cap 4 are equal. This ensures that the cross-sections of the first end cap 2 and the second end cap 4 are identical in shape and size to the cross-section of the rotor core 3, enabling them to better fit the ends of the rotor core 3, ensuring smooth rotation of the rotor core 3 while also enhancing protection for the rotor core 3.

[0050] Continue to refer to Figure 1-Figure 2 In the structure of this embodiment, the first end cover 2, the rotor core 3, and the second end cover 4 are relatively fixed by the tie rod 5, the nut 6, and the first retaining ring 7. The second retaining ring 8 is interference-fitted with the rotating shaft 1 to enable the rotor core 3 to drive the rotating shaft 1 to rotate synchronously. However, the rotor core 3 may be affected by loosening of the nut 6, the first retaining ring 7, or the second retaining ring 8, resulting in unstable transmission. To ensure that the rotor core 3 can drive the rotating shaft 1 to rotate, the rotor core 3 and the rotating shaft 1 are interference-fitted. Optionally, the first end cover 2 and the second end cover 4 are also interference-fitted with the rotating shaft 1.

[0051] This embodiment also provides a motor comprising the aforementioned rotor assembly. Furthermore, the motor further comprises a stator and an output shaft. The rotor core 3 of the rotor assembly is capable of rotating relative to the stator of the motor, thereby driving the rotor core 3 to rotate via the stator, thereby driving the rotating shaft 1 to rotate. The rotating shaft 1 then drives the output shaft of the motor to rotate, thereby achieving the motor drive function. When the rotor assembly rotates at high speeds, the first retaining ring 7 is less likely to fall off, providing a stable connection and facilitating control of the preload force between the first end cap 2 and the rotor core 3. This ensures a stable and highly reliable overall connection structure for the motor.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A rotor assembly comprising a rotating shaft (1), a first end cover (2) sleeved on the rotating shaft (1) and abutting against the rotating shaft (1) in sequence along the axial direction of the rotating shaft (1), a rotor core (3), and a second end cover (4), wherein the rotor core (3) can drive the rotating shaft (1) to rotate; It is characterized by: Also included is a connection assembly, the connection assembly comprising: A pull rod (5) comprising a head (51), a screw segment (52) and a shaft end (53) connected in sequence, wherein the head (51) abuts against an end of the first end cover (2) away from the rotor core (3); a nut (6) threadedly connected to the screw segment (52) and abutting against one end of the rotor core (3) close to the second end cover (4); a first retaining ring (7) which is interference-fitted with the shaft end (53) and abuts against an end of the second end cover (4) away from the rotor core (3); The second end cover (4) has a first accommodating groove (41), and the nut (6) is located in the first accommodating groove (41).

2. The rotor assembly according to claim 1, wherein: There are multiple connecting assemblies, and the multiple connecting assemblies are spaced apart along the circumferential direction of the rotating shaft (1).

3. The rotor assembly according to claim 1 or 2, characterized in that: A stop block (11) is protruded from the outer peripheral wall of the rotating shaft (1), and the connecting assembly further comprises a second stop ring (8), the second stop ring (8) is interference fit with the rotating shaft (1), the first end cover (2), the rotor core (3) and the second end cover (4) are all arranged between the stop block (11) and the second stop ring (8), one of the stop block (11) and the second stop ring (8) abuts against the first end cover (2) along the axial direction of the rotating shaft (1), and the other abuts against the second end cover (4) along the axial direction of the rotating shaft (1).

4. The rotor assembly according to claim 3, wherein: The second end cover (4) has a second accommodating groove (42), and the second retaining ring (8) is located in the second accommodating groove (42) and abuts against the bottom wall of the second accommodating groove (42).

5. The rotor assembly according to claim 3, wherein: The first end cover (2) has a third accommodating groove (21), and the stop block (11) is located in the third accommodating groove (21) and abuts against the bottom wall of the third accommodating groove (21).

6. The rotor assembly according to claim 1 or 2, characterized in that: The rotating shaft (1) has an output shaft mounting groove (12), the output shaft mounting groove (12) is used to mount the output shaft of the motor, and the rotating shaft (1) can drive the output shaft to rotate synchronously.

7. The rotor assembly according to claim 1 or 2, characterized in that: The outer diameters of the first end cover (2), the rotor core (3) and the second end cover (4) are equal.

8. The rotor assembly according to claim 1 or 2, characterized in that: The rotor core (3) and the rotating shaft (1) are interference fit.

9. The motor is characterized in that The invention comprises a rotor assembly according to any one of claims 1 to 8.

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