CN115441612A - Rotor assembly and motor - Google Patents

Abstract

The invention belongs to the technical field of motors and discloses a rotor assembly and a motor, wherein the rotor assembly comprises a connecting assembly, the connecting assembly comprises a pull rod, a nut and a first retaining ring, the pull rod comprises a head part, a screw rod section and a shaft end which are sequentially connected, the head part is abutted against one end, far away from a rotor iron core, of a first end cover so as to realize axial limiting of the first end cover, the nut is in threaded connection with the screw rod section and is abutted against one end, close to a second end cover, of the rotor iron core so as to realize axial limiting of the rotor iron core, the first end cover and the rotor iron core are fixed in the axial direction, and pretightening force can be conveniently controlled. On the basis through the nut fastening, still set up first fender ring, first fender ring and axle head interference fit and keep away from rotor core's one end butt with the second end cover to realize the axial fixity between first end cover, rotor core and the second end cover, in addition, the in-process of assembly can not damage rotor core, and when the rotor subassembly rotated at a high speed, first fender ring was difficult for droing.

Description

Rotor assembly and motor

Technical Field

The invention relates to the technical field of motors, in particular to a rotor assembly and a motor.

Background

In traditional motor, rotor core passes through bolted connection with balanced end plate usually to realize the axial fixity between rotor core and the balanced end plate, for example prior art provides one kind and adopts the long screw rod in order to realize the front end plate, the axial fixity's between iron core and the rear end plate structure, specifically passes front end plate, iron core and rear end plate for the long screw rod in proper order, and wears out from the rear end plate, and the part of wearing out cooperates with the nut, screws the nut and can realize axial fixity. However, the problem is that when the rotor rotates at a high speed, the nut is easy to loosen and even fall off, so that the connection between the rotor core and the balance end plate fails. And if the screw rod and the nut are directly replaced by the shaft and the baffle ring in interference fit, although the baffle ring is not easy to fall off when the rotor rotates at a high speed, the rotor core can be crushed in the press mounting process, and the pretightening force between the rotor core and the balance end plate is not easy to control.

Disclosure of Invention

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 a rotor rotates at a high speed, a nut is easily loosened or even dropped off, and if the nut is directly replaced by a shaft and a retainer ring, the pretightening force is not easily controlled.

In order to achieve the purpose, the invention adopts the following technical scheme:

the rotor assembly comprises a rotating shaft, and a first end cover, a rotor core and a second end cover which are sleeved on the rotating shaft and sequentially abutted along the axial direction of the rotating shaft, wherein the rotor core can drive the rotating shaft to rotate;

still include coupling assembling, coupling assembling includes:

the pull rod comprises a head part, a screw rod section and a shaft end which are sequentially connected, and the head part is abutted against one end of the first end cover, which is far away from the rotor core;

the nut is in threaded connection with the screw rod section and is abutted with one end, close to the second end cover, of the rotor iron core;

and the first retaining ring is in interference fit with the shaft end and is abutted against one end, far away from the rotor core, of the second end cover.

As a preferable aspect of the rotor assembly, the second end cap has a first receiving groove, and the nut is located in the first receiving groove.

As the preferable scheme of the rotor assembly, the connecting assembly is provided with a plurality of connecting assemblies, and the plurality of connecting assemblies are arranged at intervals along the circumferential direction of the rotating shaft.

As the preferred scheme of rotor subassembly, the protruding backstop that is equipped with of periphery wall of pivot, coupling assembling still includes the second and keeps off the ring, the second keep off the ring with pivot interference fit, first end cover rotor core and the second end cover all set up in the backstop with between the second fender ring, the backstop with one of them of second fender ring with first end cover is followed the axial butt of pivot, another with the second end cover is followed the axial butt of pivot.

As a preferred embodiment of the rotor assembly, the second end cap has a second receiving groove, and the second retainer is located in the second receiving groove and abuts against a bottom wall of the second receiving groove.

As a preferable scheme of the rotor assembly, the first end cap has a third receiving groove, and the stop block is located in the third receiving groove and abuts against a bottom wall of the third receiving groove.

As a preferable scheme of the rotor assembly, the rotating shaft has an output shaft mounting groove, the output shaft mounting groove is used for mounting the output shaft of the motor, and the rotating shaft can drive the output shaft to rotate synchronously.

As a preferable scheme of the rotor assembly, the outer diameters of the first end cover, the rotor core and the second end cover are equal.

As a preferable scheme of the rotor assembly, the rotor core is in interference fit with the rotating shaft.

According to another aspect of the present invention, there is provided an electric machine comprising the rotor assembly described above.

The invention has the beneficial effects that:

the invention provides a rotor assembly, which comprises a rotating shaft, a first end cover, a rotor core and a second end cover, wherein the rotor core can drive the rotating shaft to rotate, so that an output shaft of a motor can be driven to rotate, and a basic motor driving function is realized. In addition, still include coupling assembling, coupling assembling includes the pull rod, nut and first fender ring, the pull rod is including the head that connects gradually, screw rod section and axle head, the one end butt of rotor core is kept away from to head and first end cover, it is spacing to realize the axial of first end cover, nut threaded connection is in the screw rod section and be close to the one end butt of second end cover with rotor core, it is spacing to realize rotor core's axial, so that first end cover and rotor core follow axial fixity, and be convenient for control pretightning force through threaded connection. On the basis of fastening through the nut, still set up first fender ring, first fender ring and axle head interference fit keep away from rotor core's one end butt with the second end cover, thereby realize first end cover, axial fixity between rotor core and the second end cover, in addition, accomplish through first fender ring and axle head interference fit's mode and be connected, and first fender ring butt in the second end cover, the in-process of assembly can not damage rotor core, and adopt interference fit, when the rotor subassembly rotates at a high speed, first fender ring is difficult for taking place to drop, connect stably.

The invention also provides a motor which comprises the rotor assembly, when the rotor assembly rotates at a high speed, the first baffle ring is not easy to fall off, the connection is stable, and the pretightening force between the first end cover and the rotor core is convenient to control, so that the integral connection structure of the motor is stable, and the reliability is high.

Drawings

FIG. 1 is a schematic view of a rotor assembly in an embodiment of the present invention;

fig. 2 is an exploded view of a rotor assembly in an embodiment of the present invention.

In the figure:

1. a rotating shaft; 11. a stop block; 12. an output shaft mounting groove; 121. an internal spline.

2. A first end cap; 21. a third accommodating groove;

3. a rotor core;

4. a second end cap; 41. a first accommodating groove; 42. a second accommodating groove;

5. a pull rod; 51. a head portion; 52. a screw section; 53. a shaft end;

6. a nut;

7. a first retainer ring;

8. a second retainer ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

The prior art provides an adopt the long screw rod in order to realize the axial fixity's between front end plate, iron core and the back end plate structure, specifically for the long screw rod passes front end plate, iron core and back end plate in proper order to wear out from the back end plate, the part of wearing out cooperates with the nut, screws the nut and can realize axial fixity. However, the problem is that when the rotor rotates at a high speed, the nut is easy to loosen and even fall off, so that the connection between the rotor core and the balance end plate fails. And if the screw rod and the nut are directly replaced by the shaft and the baffle ring in interference fit, although the baffle ring is not easy to fall off when the rotor rotates at a high speed, the rotor core can be crushed in the press mounting process, and the pretightening force between the rotor core and the balance end plate is not easy to control.

To above-mentioned problem, this embodiment provides the rotor subassembly to when solving among the prior art rotor high-speed rotation, lead to the nut not hard up to drop even easily, and if direct more changes the axle and keeps off the ring, then the problem of difficult control pretightning force can be used to motor technical field.

Referring to fig. 1-2, the rotor subassembly includes that pivot 1 and cover are located pivot 1 and along the first end cover 2 of pivot 1's axial butt in proper order, rotor core 3 and second end cover 4, rotor core 3 can drive pivot 1 and rotate, specifically speaking, the rotor subassembly is as a part of motor, rotor core 3 of rotor subassembly can rotate for the stator of motor to drive pivot 1 and rotate, pivot 1 is used for driving the output shaft rotation of motor, in order to realize basic motor drive function. Specifically, the motor further includes a stator for driving the rotor core 3 to rotate. The rotating shaft 1 is used for connecting an output shaft of a motor and outputting torque. Alternatively, the rotor core 3 is assembled from a plurality of segmented cores for ease of manufacture, and may be integrally formed.

With continued reference to fig. 1-2, the rotor assembly further includes a coupling assembly comprising: the pull rod 5, the nut 6 and the first baffle ring 7, the pull rod 5 comprises a head 51, a screw rod section 52 and a shaft end 53 which are connected in sequence, the head 51 is abutted to one end, away from the rotor core 3, of the first end cover 2, and the pull rod 5 penetrates through the first end cover 2, the rotor core 3 and the second end cover 4 in sequence. Nut 6 threaded connection is in screw rod section 52 and the one end butt that is close to second end cover 4 with rotor core 3 to it is spacing to realize rotor core 3's axial, so that first end cover 2 is fixed along the axial with rotor core 3, and is convenient for control the pretightning force through threaded connection. In addition, rotor core 3 is fixed through pull rod 5 and first end cover 2, compares in adopting welded mode fixed rotor core 3, can avoid causing the dielectric breakdown between rotor core 3 owing to the welding, increases eddy current loss between rotor core 3.

Continuing to refer to fig. 1-2, on the basis of fastening through nut 6, still set up first fender ring 7, first fender ring 7 keeps off the one end butt of rotor core 3 with axle head 53 interference fit and keeping away from with second end cover 4, thereby realize first end cover 2, axial fixity between rotor core 3 and the second end cover 4, in addition, accomplish through first fender ring 7 and axle head 53 interference fit's mode and be connected, and first fender ring 7 butt in second end cover 4, rotor core 3 can not damaged in the in-process of assembly, and adopt interference fit, when the rotor subassembly rotates at a high speed, first fender ring 7 is difficult for taking place to drop, connect stably.

Optionally, an elastic washer is disposed between the nut 6 and the rotor core 3 to avoid the nut 6 from loosening when the rotor assembly rotates at a high speed as much as possible. Or two nuts 6 are arranged, the two nuts 6 are abutted, and one nut 6 is abutted with the rotor core 3, so that self-locking is realized.

With continued reference to fig. 1-2, the second end cap 4 has a first receiving groove 41, and the nut 6 is located in the first receiving groove 41 to reduce the space occupied by the nut 6, so that the appearance of the entire rotor assembly is neat, and at the same time, the nut 6 is protected to prevent the nut 6 from falling off.

With continued reference to fig. 1-2, the connection assemblies are provided in plurality, and the connection assemblies are arranged at intervals along the circumferential direction of the rotating shaft 1 to improve the stability of axial spacing among the first end cover 2, the rotor core 3 and the second end cover 4.

With continued reference to fig. 1-2, in order to axially limit the first end cover 2, the rotor core 3, the second end cover 4, and the connecting assembly from the rotating shaft 1, the rotor assembly of the present embodiment adopts the following structure. The protruding backstop piece 11 that is equipped with of periphery wall of pivot 1, coupling assembling still include second fender ring 8, second fender ring 8 and 1 interference fit of pivot, and first end cover 2, rotor core 3 and second end cover 4 all set up between backstop piece 11 and second fender ring 8, and backstop piece 11 and one of them of second fender ring 8 and first end cover 2 along the axial butt of pivot 1, another and second end cover 4 along the axial butt of pivot 1. The axial spacing among the first end cover 2, the rotor core 3, the second end cover 4 and the rotating shaft 1 is completed through the stop block 11 and the second baffle ring 8.

With reference to fig. 1-2, the second end cap 4 has a second receiving groove 42, the second baffle ring 8 is located in the second receiving groove 42 and abuts against the bottom wall of the second receiving groove 42, and the second receiving groove 42 is disposed to save the space occupied by the second baffle ring 8, so that the appearance of the entire rotor assembly is neat.

With continued reference to fig. 1-2, similarly, the first end cap 2 has a third receiving groove 21, and the stop block 11 is located in the third receiving groove 21 and abuts against the bottom wall of the third receiving groove 21, so as to save the space occupied by the stop block 11 by providing the third receiving groove 21, and make the appearance of the entire rotor assembly neat.

With continued reference to fig. 1-2, the rotating shaft 1 has an output shaft mounting groove 12, the output shaft mounting groove 12 is used for mounting an output shaft of the motor, and the rotating shaft 1 can drive the output shaft to rotate synchronously. Specifically, the inner wall of the output shaft mounting groove 12 is provided with an internal spline 121, and the output shaft is connected with the rotating shaft 1 through the internal spline 121 and can synchronously rotate under the driving of the rotating shaft 1. In addition, the connection can be performed through a coupler or by welding.

With continued reference to fig. 1-2, the outer diameters of the first end cap 2, the rotor core 3, and the second end cap 4 are equal. Thereby make the cross-section of first end cover 2 and second end cover 4 the same with rotor core 3's cross sectional shape and size homogeneous phase, can laminate with rotor core 3's both ends better to guarantee that rotor core 3 can steadily rotate, strengthen the guard action to rotor core 3 simultaneously.

With reference to fig. 1-2, in the structure of this embodiment, the first end cover 2, the rotor core 3, and the second end cover 4 are kept relatively fixed by the pull rod 5, the nut 6, and the first retaining ring 7, and the rotor core 3 drives the rotating shaft 1 to rotate synchronously by interference fit of the second retaining ring 8 with the rotating shaft 1, but the transmission may be unstable due to the influence of the looseness of the nut 6, the first retaining ring 7, or the second retaining ring 8, and in order to ensure that the rotor core 3 can drive the rotating shaft 1 to rotate, the rotor core 3 is in interference fit with the rotating shaft 1. Optionally, the first end cap 2 and the second end cap 4 are also in interference fit with the rotating shaft 1.

This embodiment still provides the motor, including above-mentioned rotor subassembly, in addition, the motor still includes stator and output shaft, and rotor core 3 of rotor subassembly can rotate for the stator of motor to accessible stator drive rotor core 3 rotates, and drives pivot 1 and rotate, and then the output shaft that drives the motor by pivot 1 rotates, in order to realize the motor drive function. When this rotor subassembly rotates at a high speed, first fender ring 7 is difficult for taking place to drop, connects stably, and is convenient for control the pretightning force between first end cover 2 and the rotor core 3 to the overall connection structure who makes the motor is stable, and the reliability is high.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The rotor assembly comprises 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 sequentially abutted along the axial direction of the rotating shaft (1), wherein the rotor core (3) can drive the rotating shaft (1) to rotate;

characterized in that still includes coupling assembling, coupling assembling includes:

the pull rod (5) comprises a head part (51), a screw rod section (52) and a shaft end (53) which are sequentially connected, and the head part (51) is abutted against one end, far away from the rotor core (3), of the first end cover (2);

the nut (6) is in threaded connection with the screw rod section (52) and is abutted against one end, close to the second end cover (4), of the rotor iron core (3);

and the first retaining ring (7) is in interference fit with the shaft end (53) and is abutted against one end, far away from the rotor core (3), of the second end cover (4).

2. The rotor assembly according to claim 1, wherein the second end cap (4) has a first receiving slot (41), the nut (6) being located within the first receiving slot (41).

3. The rotor assembly according to claim 1, wherein the connecting assembly is provided in plurality, and the plurality of connecting assemblies are arranged at intervals in a circumferential direction of the rotating shaft (1).

4. A rotor assembly as claimed in any one of claims 1 to 3, wherein the outer circumferential wall of the rotating shaft (1) is provided with a protruding stop block (11), the connecting assembly further comprises a second stop ring (8), the second stop ring (8) is in interference fit with the rotating shaft (1), the first end cap (2), the rotor core (3) and the second end cap (4) are all disposed 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 cap (2) along the axial direction of the rotating shaft (1), and the other abuts against the second end cap (4) along the axial direction of the rotating shaft (1).

5. The rotor assembly according to claim 4, wherein the second end cap (4) has a second receiving groove (42), the second baffle ring (8) being located within the second receiving groove (42) and abutting against a bottom wall of the second receiving groove (42).

6. The rotor assembly according to claim 4, wherein the first end cap (2) has a third receiving groove (21), the stop block (11) being located within the third receiving groove (21) and abutting against a bottom wall of the third receiving groove (21).

7. The rotor assembly according to any one of claims 1 to 3, wherein the rotating shaft (1) has an output shaft mounting groove (12), the output shaft mounting groove (12) is used for mounting an output shaft of a motor, and the rotating shaft (1) can drive the output shaft to rotate synchronously.

8. A rotor assembly according to any one of claims 1-3, wherein the outer diameters of the first end cap (2), the rotor core (3) and the second end cap (4) are equal.

9. A rotor assembly according to any one of claims 1-3, wherein the rotor core (3) is interference fitted with the rotating shaft (1).

10. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 9.

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