CN211239492U - A connection structure of rotor assembly and shaft center - Google Patents

Abstract

The utility model relates to the field of electromechanical technology, in particular to a connecting structure of a rotor assembly and an axle center, which comprises the axle center, the rotor assembly and a key, wherein the axle center is provided with a first shaft shoulder, the first shaft shoulder is provided with a first groove, the key is partially embedded into the first groove, and the rest part is embedded into a second groove of the rotor assembly, so that the rotor assembly and the axle center rotate synchronously; the first groove and/or the second groove may block radial movement of the key. The rotor assembly or the groove at the first shaft shoulder is processed into the built-in invisible key groove, so that the key can be prevented from loosening and separating due to the action of centrifugal force in the high-speed running process; meanwhile, the shaft system is convenient to disassemble and assemble and keys are easy to replace; the novel connecting structure is favorable for guaranteeing the verticality and the planeness of the contact end face of the novel connecting structure, and realizes the precision machining of each part so as to meet the overall high-precision requirement of a shaft system, thereby realizing the technical effects of low vibration, small bearing heating, long service life and high safety of the whole shaft system in a high-speed rotating process.

Description

A connection structure of rotor assembly and shaft center

technical field

The utility model relates to the field of electromechanical technology, in particular to a connection structure between a rotor assembly and a shaft center.

Background technique

At present, some motors adopt the rotor sleeve transition structure, which is realized by fixing the magnetic steel on the rotor sleeve, and then fixing the rotor sleeve on the shaft center by key connection. The patent document "A Permanent Magnet Synchronous Motor Rotor Assembly and Its Manufacturing Method" discloses a method of realizing the synchronous rotation of the rotor and the rotating shaft by means of key connection. However, there is often a certain gap between the key and the shaft center, the key and the rotor sleeve in the above connection method, which leads to the distortion of the magnetic circuit and greatly reduces the stability and accuracy of the motor operation. The method needs to open a slender keyway on the shaft, which will weaken the mechanical strength of the shaft to a certain extent, and the processing of the slender keyway brings complicated processing technology and high cost, and the connection structure is complicated and the disassembly is extremely difficult. Convenience and versatility are poor;

The other is to process the convex teeth on the rotor sleeve and the concave teeth on the shaft center, and the two cooperate with each other to realize the synchronous rotation of the rotor and the rotating shaft. This method avoids the key connection, and the processing and installation are more convenient. The rotor sleeve has axially protruding convex teeth, which cannot guarantee the flatness and verticality of the contact surface between the rotor sleeve and the shaft center, and the rotor cannot be accurately positioned during the high-speed operation of the motor; and after repeated disassembly, the convex teeth are easily deformed , the accuracy is reduced, and the contact position is prone to stress concentration and easy damage.

Utility model content

In order to solve the problems in the motor mentioned in the above-mentioned background art, in order to realize the synchronous rotation of the rotor assembly and the rotating shaft, the existing connection method of the rotor assembly and the shaft center easily leads to the weakening of the mechanical strength of the shaft center, inconvenient disassembly and assembly, or the rotor is easily deformed and damaged. The utility model provides a novel connection structure between a rotor assembly and a shaft center, which includes a shaft center, a rotor assembly and a key, the shaft center is provided with a first shaft shoulder, and the rotor assembly abuts against the first shaft shoulder, so The first shoulder is provided with a first groove, the key part is embedded in the first groove, and the remaining part is embedded in the second groove of the rotor assembly, so that the rotor assembly and the shaft center rotate synchronously; the The first groove and/or the second groove may block radial movement of the key.

On the basis of the above structure, further, the rotor assembly includes a rotor sleeve and a magnetic steel, the second groove is located on the rotor sleeve, and the magnetic steel surface is attached to the rotor sleeve.

On the basis of the above structure, further, one end of the rotor sleeve close to the first shaft shoulder is provided with a second shaft shoulder, and the second shaft shoulder is used to limit the displacement of the magnetic steel in the direction of the first shaft shoulder. The two grooves are located on the inner side of the rotor sleeve.

On the basis of the above structure, further, the opening of the first groove is located at the outer side surface and the end surface of the first shaft shoulder.

On the basis of the above structure, further, a gimbal ring is fixed on the rotor sleeve, and the magnetic steel surface is attached between the second shaft shoulder and the gimbal ring.

On the basis of the above structure, further, the number of the first groove and the second groove is 4.

On the basis of the above structure, further, the key is a flat key.

On the basis of the above structure, further, one end of the rotor sleeve away from the first shaft shoulder is fixed to the shaft center by a fastener.

On the basis of the above structure, further, the fastener includes a bearing and a lock nut, the inner ring of the bearing fits with one end of the rotor sleeve, and the lock nut is used to lock the bearing.

The utility model provides a connection structure between the rotor assembly and the shaft center. The key connection is realized by arranging key grooves at the shoulders of the rotor assembly and the shaft center respectively; The invisible keyway can prevent the loosening and detachment of the key due to centrifugal force during high-speed operation; at the same time, it can realize the quick disassembly and assembly of the shaft system and the simple replacement of the key; this new connection structure is conducive to ensuring the first shaft shoulder and the rotor assembly. The perpendicularity and flatness of the contacting end faces of the two realize the precision machining of each component to meet the overall high-precision requirements of the shafting, so as to realize the whole shafting in the process of high-speed rotation, low vibration, low bearing heating, long life, and safety. High technical effect.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work.

1 is a schematic cross-sectional view of a connection structure between a rotor assembly and a shaft center provided by the utility;

Fig. 2 is the structural representation of the shaft;

Fig. 3 is the structural representation of rotor sleeve;

Figure 4 is a schematic diagram of the structure of the key.

Reference number:

100 Shaft 110 First shoulder 111 First groove

200 Rotor sleeve 210 Second shoulder 211 Second groove

220 balance ring 230 magnet steel 240 carbon fiber sleeve

250 disassembly position 300 key 410 bearing

420 lock nut

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention The novel and simplified description does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and similar words do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, optical connections, and the like, whether direct or indirect.

According to the relevant definition of cylinder, the two circular surfaces of the cylinder are called the bottom surface, and the rotating surface is called the side surface. Therefore, the end surface mentioned in this utility model refers to the bottom surface, and the outer surface of the first shoulder refers to the rotating surface where the first shoulder is located outside. , the inner side of the rotor sleeve refers to the rotating surface inside the hollow hole of the rotor sleeve.

The present invention provides a novel connection structure between the rotor assembly and the shaft center, which includes the shaft center 100, the rotor assembly and the key 300. The shaft center 100 is provided with a first shaft shoulder 110, and the rotor assembly abuts against the first shaft. The shaft shoulder 110, the first shaft shoulder 110 is provided with a first groove 111, the key 300 is partially embedded in the first groove 111, and the rest is embedded in the second groove 211 of the rotor assembly, so that the The rotor assembly and the shaft 100 are connected to each other and rotate synchronously; the first groove 111 and/or the second groove 211 can block the radial movement of the key 300 .

In specific implementation, as shown in FIG. 1 , FIG. 2 and FIG. 3 , a connection structure between the rotor assembly and the shaft center includes the shaft center 100 , the rotor assembly and the key 300 .

It should be noted that the rotor assembly of the present invention has various forms, and several common structures in the prior art are listed here, but are not limited to the ones described here. For example, the publication number is CN208806673U, the publication date is April 30, 2019, and the title is "Motor Rotor Positioning Structure and Motor". In the motor rotor structure, the baffle plate and the rotor in the publication constitute the rotor assembly of the present utility model. , the second groove can be set on the baffle plate of the publication;

For example, the publication number is CN203278443U, the publication date is November 06, 2013, and the title is "a fixed structure of a rotor and a rotating shaft". In the rotor structure of the motor, the first rotor pressing plate, the rotor and the second rotor in the publication The pressure plate constitutes the rotor assembly of the present invention, and the second groove may be provided in the first rotor pressure plate of the disclosure. As mentioned in the following specific examples;

The rotor assembly in the embodiment provided by the present invention is composed of a rotor sleeve 200, a plurality of magnetic steels 230 attached to the rotor sleeve 200, and other components; as shown in FIG. 1, the rotor assembly includes a rotor sleeve 200 and a magnetic steel. 230, the magnetic steel 230 is attached to the rotor sleeve 200; several magnetic steels 230 are brushed with glue and then pasted to the outer surface of the rotor sleeve 200 to ensure that the gap between each magnetic steel 230 is uniform.

Specifically, the shaft center 100 is provided with a first shoulder 110 to limit the axial displacement of the rotor assembly, the first shoulder 110 is provided with a first groove 111, and the key 300 is divided into two parts in the axial direction, one of which is divided into two parts. It is embedded in the first groove 111, and the rest is embedded in the second groove 211 of the rotor assembly, so that the rotor assembly rotates synchronously with the shaft center 100; that is, the rotor assembly is axially assembled with the shaft center 100 through the key 300, wherein the key 300 starts from To transmit torque, it can be ensured that both the rotor assembly and the shaft center 100 rotate synchronously.

The first groove 111 and/or the second groove 211 can block the radial movement of the key 300, that is, by machining the second groove 211 and/or the first groove 111 as a built-in invisible key groove, that is, at least one key groove is outside There is no opening on the side, so that after the shaft 100 is connected with the rotor assembly through the key 300, the key 300 can be partially or completely hidden.

As shown in FIG. 3 , the end of the rotor sleeve 200 near the first shoulder 110 is provided with a second shoulder 210 , and the magnetic steel 230 near the second shoulder 210 abuts against the second shoulder 210 for limiting The magnetic steel 230 is displaced in the direction of the first shaft shoulder 110, and the second groove 211 is located on the inner side of the rotor sleeve 200, and just corresponds to the position of the second shaft shoulder 210, that is, the second groove 211 is the inner side of the rotor sleeve 200. The end surface of the rotor sleeve 200 close to the first shaft shoulder 110 is recessed inwardly.

As shown in FIG. 2 , the opening of the first groove 111 in this embodiment is located at the outer side surface and the end surface of the first shaft shoulder 110 , that is, the first groove 111 is a part of the outer side surface and the end face of the first shaft shoulder 110 inward. Depression is formed.

After installation, the part of the key 300 embedded in the second groove 211 is hidden inside the rotor sleeve 200, and the part of the key 300 embedded in the first groove 111 is exposed outside. Since the second groove 211 is a built-in invisible keyway, The rotor assembly and the shaft center 100 can be prevented from loosening and disengaging the keys 300 due to centrifugal force.

As shown in FIG. 2 and FIG. 3 , the numbers of the first grooves 111 and the second grooves 211 in this embodiment are both four, and they are evenly distributed.

During high-speed operation, the connection structure between the rotor assembly and the shaft center 100 can prevent the key 300 from loosening and disengaging due to centrifugal force between the rotor assembly and the shaft center 100; meanwhile, it is beneficial to ensure the verticality and flatness of the contact end face. To achieve the precision machining of each component to meet the overall high-precision requirements of the shaft system, so as to achieve the technical effects of low vibration, low bearing heat, long life and high safety during the high-speed rotation of the entire shaft system;

The utility model provides a novel connection structure between the rotor assembly and the shaft center. The key connection is realized by arranging key grooves at the shoulders of the rotor assembly and the shaft center; the grooves at the rotor assembly or the shaft shoulder are processed into The built-in invisible keyway can prevent the key from loosening and detaching due to centrifugal force during high-speed operation; at the same time, it can realize the quick disassembly and assembly of the shaft system and the simple replacement of the key; this new connection structure is easy to ensure the safety of the parts itself through a simple process High-precision requirements, so as to ensure the stability and reliability of the entire shaft system in high-speed operation.

Preferably, a part of the key 300 is embedded in the second groove 211 for interference fit with the rotor assembly, that is, the key 300 is fixed in the second groove 211 of the rotor assembly with a certain amount of interference. 300, just pull out the rotor assembly.

Preferably, a gimbal ring 220 is fixed on the rotor sleeve 200 , and the magnetic steel 230 is surface-affixed between the second shaft shoulder 210 and the gimbal ring 220 .

In specific implementation, as shown in FIG. 1 , a gimbal ring 220 is fixed on the rotor sleeve 200 . Specifically, the gimbal ring 220 is heat-fitted to the rotor sleeve 200 after heating, and the gimbal ring 220 can limit the axial displacement of the magnetic steel 230 . At the same time, the balance of the rotor can be adjusted to improve the balance accuracy; the magnetic steel 230 is attached to the rotor sleeve 200 between the second shaft shoulder 210 and the balance ring 220, and the magnetic steel 230 at both ends are respectively connected to the second shaft shoulder 210 and the balance ring. 220 against.

Preferably, the surface of the magnetic steel 230 is also covered with a carbon fiber sleeve 240 .

During specific implementation, as shown in FIG. 1 , the surface of the magnetic steel 230 is also covered with a carbon fiber sleeve 240, and the carbon fiber sleeve 240 is used to fix the magnetic steel 230 to prevent the magnetic steel 230 from falling off during high-speed operation; meanwhile, the existing magnetic steel 230 is avoided. The outer protective layer is thick or prone to eddy current loss.

Preferably, the key 300 is a flat key.

In specific implementation, as shown in FIG. 4 , the key 300 is a flat key with arc-shaped ends. During operation, the torque is transmitted by the mutual extrusion of the key and the keyway, which has good centering performance and is easy to assemble and disassemble.

Preferably, one end of the rotor sleeve 200 away from the first shaft shoulder 110 is fixed on the shaft center 100 by a fastener.

In specific implementation, as shown in FIGS. 1 and 3 , the end of the rotor sleeve 200 away from the first shaft shoulder 110 is fixed on the shaft center 100 by a fastener. Specifically, the fastener includes a bearing 410 and a lock nut 420 . The inner ring of the bearing 410 is in contact with one end of the rotor sleeve 200 , and the disassembly of the bearing 410 can be completed through the disassembly position 250 . The locking nut 420 fixes the rotor sleeve 200 between the first shaft shoulder 110 and the bearing 410 by locking the bearing 410 . on the axis 100.

Although terms such as shaft, rotor sleeve, key, shoulder, bearing, groove, gimbal, locknut, magnet, carbon fiber sleeve, etc. are used more in this paper, the possibility of using other terms is not excluded. . These terms are used only to more conveniently describe and explain the essence of the present invention; it is contrary to the spirit of the present invention to interpret them as any kind of additional limitations.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the present utility model Scope of technical solutions.

Claims (10)

1. The connecting structure of the rotor assembly and the shaft center is characterized by comprising the shaft center (100), the rotor assembly and a key (300), wherein the shaft center (100) is provided with a first shaft shoulder (110), the rotor assembly abuts against the first shaft shoulder (110), the first shaft shoulder (110) is provided with a first groove (111), part of the key (300) is embedded into the first groove (111), and the rest part of the key is embedded into a second groove (211) of the rotor assembly, so that the rotor assembly and the shaft center (100) synchronously rotate; the first recess (111) and/or the second recess (211) may block the key (300) from moving radially.

2. A connection structure of a rotor assembly to a hub as claimed in claim 1, wherein: the rotor assembly comprises a rotor sleeve (200) and magnetic steel (230), the second groove (211) is located in the rotor sleeve (200), and the magnetic steel (230) is attached to the rotor sleeve (200).

3. A connection structure of a rotor assembly to a hub as claimed in claim 2, wherein: one end of the rotor sleeve (200) close to the first shaft shoulder (110) is provided with a second shaft shoulder (210), the second shaft shoulder (210) is used for limiting the displacement of the magnetic steel (230) towards the first shaft shoulder (110), and the second groove (211) is located on the inner side face of the rotor sleeve (200).

4. A connection structure of a rotor assembly to a hub as claimed in claim 1 or 3, wherein: the opening of the first groove (111) is located at the outer side face and the end face of the first shoulder (110).

5. A connection structure of a rotor assembly to a hub as claimed in claim 3, wherein: and a balance ring (220) is fixed on the rotor sleeve (200), and the magnetic steel (230) is attached between the second shaft shoulder (210) and the balance ring (220).

6. A connection structure of a rotor assembly to a hub as claimed in claim 5, wherein: and a carbon fiber sleeve (240) is sleeved outside the magnetic steel (230).

7. A connection structure of a rotor assembly to a hub as claimed in claim 1, wherein: the number of the first grooves (111) and the number of the second grooves (211) are both 4.

8. A connection structure of a rotor assembly to a hub as claimed in claim 1, wherein: the key (300) is a flat key.

9. A connection structure of a rotor assembly to a hub as claimed in claim 2, wherein: one end of the rotor sleeve (200) far away from the first shaft shoulder (110) is fixed on the shaft center (100) through a fastener.

10. A connection structure of a rotor assembly to a hub as claimed in claim 9, wherein: the fastener includes bearing (410) and lock nut (420), bearing (410) inner circle with rotor cover one end laminating, lock nut (420) are used for locking bearing (410).

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