CN218514205U - High-speed motor bearing pre-pressure structure - Google Patents

Abstract

The utility model discloses a high-speed motor bearing pre-pressure structure, which comprises a stator component, a rotor component, an impeller and a motor shell; the motor is characterized by further comprising two bearings, wherein the two bearings are arranged in the motor through a bearing mounting structure, a stopping part is designed on the bearing mounting structure close to one end of the impeller, and the stopping part is abutted against the outer ring of the bearing close to one end of the impeller; a space for arranging a pre-pressure piece is reserved in the bearing mounting structure far away from one end of the impeller; the motor further comprises a pre-pressure piece which is arranged in the space and is propped against the outer ring of the bearing at one end far away from the impeller. The utility model discloses a change the position and the mounting means of pre-pressure spare, adjusted bearing axial internal clearance promptly, can guarantee again that the pre-pressure of bearing makes its atress balanced, avoid producing the abnormal sound, prolonged the life of bearing and whole motor simultaneously.

Description

High-speed motor bearing pre-pressure structure

Technical Field

The utility model relates to a high-speed motor field, especially small-size or miniature high-speed motor, especially be applicable to the small-size or miniature high-speed brushless motor inner bearing precompression structure of hair-dryer.

Background

High speed blowers are currently being pursued by more and more consumers, and thus the demand for high speed motors, which are the power part of high speed blowers, is also increasing. The high speed motor for hair dryer not only needs to realize the purpose of micro, high speed and low noise, but also needs to continuously discuss how to realize the stability and prolong the service life of the motor under high rotating speed.

The structure of the high-speed motor mainly comprises a stator assembly, a rotor assembly and bearings, and under the condition that the rotating speed exceeds 5 ten thousand rpm, the requirements on the bearings are high, and small precise bearings are required, so that high concentricity is required when the two bearings are installed; in order to realize the high concentricity of the bearings, the high-speed motor is designed and processed into a single cantilever structure, namely two bearings are arranged on one side of a rotor magnet, as shown in the Chinese utility model patent application with the application number of 201611140022.3 shown in figure 1, a bearing assembly 23 (comprising a pair of bearings 25b and 25 b) is fixed on one side of a magnet 22, and the structure is favorable for ensuring that the two bearings can complete high-precision positioning and installation at one time and ensure the concentric installation of the two bearings; however, new problems are also brought about: between the pair of bearings 25b, a spring 26 (or washer) for preloading (i.e., pre-pressing) the outer rings of the bearings 25b, 25b is included. As shown in fig. 2, the spring 26 provides forces in both directions L1 and L2, in order to adjust the axial play of the bearing 25a and the bearing 25b, such that the ball of the bearing 25a rubs against the a1 surface and the ball of the bearing 25b rubs against the b1 surface; however, since the high speed of the high speed motor generates a large amount of heat, an impeller 24 is required to be disposed at one side of the motor to drive air to flow rapidly to dissipate heat of the motor. In this case, a force in the direction L3 is generated when the impeller rotates, so that the bearing 25a on the side away from the impeller receives a large preload, and the bearing 25b loses the preload as the balls of the bearing 25a are worn, thereby generating noise or causing a new failure or shortening the life of the motor.

In the existing structure, besides the design that the bearing is disposed on one side of the rotor magnet in the above-mentioned "single cantilever" structure, there is also a design that the bearing is arranged on two sides of the rotor magnet, and meanwhile, in order to provide pre-pressure for the bearing, a pre-pressure spring or a washer is disposed on the outer sides of the two bearings, as shown in the application of the chinese utility model with the application number of 201911219908.0 in fig. 3, the first bearing 90 and the second bearing 110 are disposed on two sides of the motor rotor 40, and the first wave washer 130 and the second wave washer 140 are disposed on the outer sides of the first bearing 90 and the second bearing 110 respectively to provide pre-pressure for the bearing, wherein the first bearing 90 is disposed on one side close to the impeller 20. In operation, the impeller rotates to generate a force in the direction L3, the spacer 140 on the side away from the impeller applies a force in the direction L2, and the spacer 130 on the side close to the impeller applies a force L1 in the direction opposite to L3. Or as shown in fig. 4, the chinese patent application No. 202120281410.3, two bearings 33 are respectively located at two sides of the magnetic ring 38 (i.e. the rotor magnet), and further two metal rings 39 are arranged between the two bearings and the magnetic ring 38 to provide pre-pressure for the bearings; the same two rings provide a pair of oppositely directed forces L1, L2, while the impeller 30 rotates to produce a force in the direction L3.

In all of the above-mentioned structures, because of the existence of unbalanced force opposite to the force generated when the impeller rotates in the pre-pressure applied on both sides of the bearing, the long-time high-speed operation of the motor can cause the accelerated ball abrasion of the two bearings due to the unbalanced pre-pressure, and further generate abnormal sound or faults.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-speed motor bearing precompression structure to avoid the problem mentioned in the above-mentioned background art, make two bearings can keep steady balanced precompression at full life cycle, and then avoid producing the abnormal sound, further improve the life of bearing and whole motor.

The utility model discloses the technical scheme who adopts as follows: a high-speed motor bearing pre-pressure structure comprises a stator assembly, a rotor assembly, an impeller and a motor shell; the motor is characterized by further comprising two bearings, wherein the two bearings are arranged in the motor through a bearing mounting structure, a stopping part is designed on the bearing mounting structure close to one end of the impeller, and the stopping part is abutted against the outer ring of the bearing close to one end of the impeller; a space for arranging a pre-pressure piece is reserved in the bearing mounting structure far away from one end of the impeller; the motor further comprises a prepressing part which is arranged in the space, and the prepressing part is propped against the outer ring of the bearing at one end far away from the impeller.

Wherein the bearing mounting structure is a bearing mount or an aperture or hole defined in an inner wall of the motor housing.

The stopping part is in a step shape with a convex part, and the convex part is abutted against an outer ring of the outer end face of the bearing.

Wherein the pre-pressure piece is a pre-pressure spring.

One end of the pre-pressure spring is positioned on an outer ring of the outer end face of the bearing, and the other end of the pre-pressure spring is positioned through a clamping structure.

Wherein the pre-pressure piece is a pre-pressure washer.

Wherein, the pre-pressure washer is propped against the outer ring of the outer end face of the bearing.

A high-speed motor bearing pre-pressure structure comprises a stator assembly, a rotor assembly, an impeller and a motor shell; the motor is characterized by further comprising two bearing mounting seats, wherein the bearing mounting seat close to one end of the impeller is designed to be step-shaped; the height of the bearing mounting seat far away from one end of the impeller is greater than that of the bearing so as to reserve a space for arranging a pre-pressure piece; bearings are respectively arranged in the two bearing mounting seats; the motor further comprises a pre-pressure washer and a pre-pressure spring, wherein the pre-pressure washer is arranged in the bearing mounting seat close to one end of the impeller, and the pre-pressure spring is arranged in the space.

The pre-pressure washer is abutted against an outer ring of the outer end face of the bearing, one end of the pre-pressure spring is positioned on the outer ring of the outer end face of the bearing, and the pre-pressure of the pre-pressure spring is larger than that of the pre-pressure washer.

The motor casing is of a cylindrical structure with an air duct.

The motor casing is divided into a first casing and a second casing in the length direction, the two casings are combined to form a cylindrical structure whole with an air duct, and the two bearing mounting bases and the first casing or the second casing are integrally formed.

The motor casing is a cylindrical structure main body with a mounting hole formed in the wall surface and an air duct, and the mounting hole is sealed through a mounting window matched with the mounting hole to form a complete cylindrical structure; wherein the two bearing mounting seats and the tubular structure main body are integrally formed.

The utility model discloses a high-speed motor bearing pre-pressure structure, its advantage and efficiency lie in: the utility model discloses a change the position and the mounting means of pre-pressure spare, adjusted bearing axial internal clearance promptly, can guarantee again that the pre-pressure of bearing makes its atress balanced, avoids producing the abnormal sound, has prolonged the life of bearing and whole motor simultaneously.

Drawings

FIG. 1 is a schematic structural diagram of prior art 1

FIG. 2 is a schematic diagram of the stress of the prior art 1

FIG. 3 is a schematic diagram of the structure and stress of the prior art 2

FIG. 4 is a schematic diagram of the structure and stress of the prior art 3

FIG. 5 is a schematic structural diagram of embodiment 1 of the present invention

FIG. 6 is a schematic view of a partial structure of embodiment 1 of the present invention

FIG. 7 is a schematic view of the stress of embodiment 1 of the present invention

Fig. 8 is a schematic structural diagram of embodiment 4 of the present invention

Fig. 9 is a schematic structural diagram of embodiment 5 of the present invention

The numbers in the figures are as follows:

11-stator assembly 12-rotor assembly

121-rotor magnet 122-shaft

13- impeller 14a, 14 b-bearing mount

15-Motor casing 151-first casing

152-second shell 153-reinforcing flow guide ribs

16- space 17a, 17 b-bearing

18-precompression spring 19-retainer ring for hole

N-inner wall

130' -wave washer 141-precompression spring

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

Example 1

As shown in fig. 5 and 6, the utility model provides a high-speed motor bearing pre-pressure structure, which can be especially applied to a high-speed electric hair drier, comprising a stator assembly 11, a rotor assembly 12, an impeller 13 and a motor shell 15; the stator component at least comprises a stator and a coil; the rotor assembly includes at least a rotor magnet 121 and a shaft 122; the motor further comprises two bearing mounting seats 14a and 14b which are respectively arranged at two ends of a rotor magnet 121 of a motor rotor assembly; the specific type and assembly process of conventional parts of the high-speed motor of the hair dryer can be selected and adjusted according to the needs, and the details are not repeated herein.

In this embodiment, the motor casing 15 is divided into two parts in the length direction, specifically, a first casing 151 and a second casing 152, the two parts are combined to form a cylindrical structure with an air duct, the cylindrical structure has an inner wall and an outer wall, and reinforcing flow guide ribs 153 are uniformly distributed between the two walls, so that the two parts have the inner wall and the outer wall to form the air duct, and the first casing and the second casing are also respectively of a structure with the inner wall and the outer wall; the bearing mounting seats 14a and 14b and the first shell are integrally formed, and the two bearings 17a and 17b are respectively arranged in the two bearing mounting seats; the rotor magnet 121 and the stator assembly of the rotor assembly are disposed in the cavity between the two bearing mounts.

In this embodiment, the bearing mount 14a near one end of the impeller 13 is designed to be step-shaped; the height of the bearing mounting seat 14b far away from one end of the impeller 13 is greater than that of the bearing so as to reserve a space 16 for arranging a pre-pressure piece; the motor further comprises a pre-pressure member, in this embodiment a pre-pressure spring 18, arranged in said space 16, one end of the pre-pressure spring 18 being positioned at the outer ring of the outer end surface of the bearing 17b and the other end being positioned by a hole retainer 19. It will be appreciated that the pre-stress member may also be a pre-stress washer, acting against the outer race of the bearing to provide pre-stress to the bearing.

As shown in fig. 7, since the inner ring of the bearing is tightly connected with the shaft, the above embodiment provides a pre-pressure L1' to the bearing through the pre-pressure spring 18 to adjust the axial play of the bearing; when L1' acts on the outer ring of the bearing 17b, the balls of the bearing 17b run along the a1' surface ball grooves, the play of the bearing 17b is adjusted, and the balls are in close contact with the a1' surface of the bearing; therefore, the pre-pressure L1 'is transmitted to the bearing 17a (on the side close to the impeller) by the shaft 122, the bearing 17b (on the side far from the impeller), and the rotor magnet 121, and at this time, due to the step-shaped structure design in the bearing mounting seat 14a on the side close to the impeller, the convex portion of the step is abutted against the outer ring of the outer end face of the bearing 17a so as not to move, and the balls of the bearing 17a run along the ball grooves of the b1' face of the bearing, thereby adjusting the axial play of the bearing 17 a. Meanwhile, the impeller 13 generates a force in the direction of L3' when rotating, and the direction of the force in the direction of L3' is the same as the direction of the pre-pressure L1', so that the pre-pressure of the bearings 17a and 17b can be well ensured, and the problems in the background art are solved.

Example 2

As another structure of the present invention, the pre-pressure member may be a pre-pressure washer.

Example 3

As another structure of the present invention, the difference between the present invention and embodiments 1 and 2 is that the motor casing may be a cylindrical main body with a mounting hole on a wall surface and an air duct, and the mounting hole is sealed by a mounting window matching with the mounting hole to form a complete cylindrical structure; the cylindrical structure is provided with an inner wall surface and an outer wall surface, and reinforcing flow guide ribs are uniformly distributed between the two wall surfaces. The inner part of the cylindrical shell corresponding to the mounting hole is a cavity capable of containing a stator assembly and a rotor assembly of the motor; the two bearing mounting seats and the cylindrical structure main body are integrally formed.

Example 4

As shown in fig. 8, as another structural form of the present invention, a high-speed motor bearing pre-pressure structure, especially applicable to a high-speed electric hair dryer, can include a stator assembly, a rotor assembly, an impeller and a motor casing; the stator assembly at least comprises a stator and a coil (which are conventional parts of a high-speed motor and are not specifically shown in the figure); the rotor assembly includes at least a rotor magnet and a shaft; the specific type and assembly process of conventional parts of the high-speed motor of the hair dryer can be selected and adjusted according to the needs, and the details are not repeated herein.

In this embodiment, the inner wall N of the motor defines a hole for supporting a rotor assembly, the rotor assembly includes a rotor magnet 121, and two bearings 17a and 17b located on the same side of the rotor magnet 121, and the two bearings are located in the hole defined by the inner wall N, wherein an outer end surface of the bearing 17a close to the impeller side abuts against a bearing mounting structure (which may be a bearing mounting seat or a stopper portion provided on the inner wall N of the inner wall of the motor, as shown in fig. 8), an outer end surface of the bearing 17b far from the impeller side provides a pre-pressure by providing a pre-pressure spring 18, and the pre-pressure spring is further located by a hole retaining ring 19 or other retaining structures.

Example 5

As shown in fig. 9, as another structural form of the present invention, a high-speed motor bearing pre-pressure structure, especially applicable to a high-speed electric hair dryer, can include a stator assembly, a rotor assembly, an impeller and a motor casing; the stator assembly at least comprises a stator and a coil (which are conventional parts of a high-speed motor and are not specifically shown in the figure); the rotor assembly includes at least a rotor magnet and a shaft; the specific type and assembly process of conventional parts of the high-speed motor of the hair dryer can be selected and adjusted according to the needs, and the details are not repeated herein.

The difference from embodiment 1 is that the two bearing mounting seats of the motor are not integrally formed, and the two bearings and the mounting structures thereof can be respectively and independently arranged at corresponding positions of the motor shell or the end cover, which is realized by persons in the related art according to needs. In this embodiment, pre-pressure members are disposed between the outer end face of each bearing and the mounting structure thereof, and are characterized in that the pre-pressure member in the bearing mounting structure far away from one end of the impeller is a pre-pressure spring 141, the pre-pressure member in the bearing mounting structure near one end of the impeller is a pre-pressure washer, and in this embodiment, the pre-pressure spring 141 and the wave washer 130 'both abut against the outer ring of the corresponding bearing, and the pre-pressure of the pre-pressure spring 141 is much greater than the pre-pressure of the wave washer 130', so that the direction of the difference between the two is the same as the direction of the force generated by the rotation of the impeller.

It should be noted that the high-speed motor bearing pre-pressure structure provided by the utility model can be applied to the related fields of electric hair dryers, bladeless fans, negative pressure dust collectors, hand dryers, bathroom drying, and the like; the directional phrases referred to in this application, for example: up, down, left, right, front, rear, inner, outer, lateral, etc., are simply directions with reference to the drawings. Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. Also, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the invention. However, without these technical details and with numerous changes and modifications of the above-described embodiments, it is possible to make and implement the invention without departing from the scope of protection defined by the claims of the present invention.

Claims (10)

1. A high-speed motor bearing pre-pressure structure comprises a stator assembly, a rotor assembly, an impeller and a motor shell; the motor is characterized by further comprising two bearings, wherein the two bearings are arranged in the motor through a bearing mounting structure, a stopping part is designed on the bearing mounting structure close to one end of the impeller and abuts against the outer ring of the bearing close to one end of the impeller, and a space for arranging a pre-pressure part is reserved in the bearing mounting structure far away from one end of the impeller; the motor further comprises a pre-pressure piece which is arranged in the space and is propped against the outer ring of the bearing at one end far away from the impeller.

2. The high-speed motor bearing pre-stress structure of claim 1, wherein: wherein the bearing mounting structure is a bearing mount or an aperture or hole defined in an inner wall of the motor housing.

3. The high-speed motor bearing pre-stress structure of claim 1, wherein: the stopping part is in a step shape with a convex part, and the convex part is abutted against an outer ring of the outer end face of the bearing.

4. The high-speed motor bearing pre-stress structure of claim 1, wherein: the pre-pressure piece is a pre-pressure spring.

5. The high-speed motor bearing pre-stress structure of claim 4, wherein: one end of the pre-pressure spring is positioned on the outer ring of the outer end face of the bearing, and the other end of the pre-pressure spring is positioned through a clamping structure.

6. The high-speed motor bearing pre-stress structure of claim 1, wherein: the pre-pressure member is a pre-pressure washer.

7. A high-speed motor bearing pre-stress structure according to any one of claims 1 to 6, characterized in that: the motor casing is a tubular structure with an air duct.

8. A high-speed motor bearing pre-stress structure according to any one of claims 1 to 6, characterized in that: the motor casing divide into first casing and second casing two parts in length direction, be a tubular structure whole that has the wind channel after two parts casing combination, wherein two bearing mounting structure and this first casing or second casing integrated into one piece.

9. A high-speed motor bearing pre-stress structure according to any one of claims 1 to 6, characterized in that: the motor casing is a cylindrical structure main body with a mounting hole formed in the wall surface and an air duct, and the mounting hole is sealed through a mounting window matched with the mounting hole to form a complete cylindrical structure; wherein the two bearing mounting structures and the cylindrical structure main body are integrally formed.

10. A high-speed motor bearing pre-pressure structure comprises a stator assembly, a rotor assembly, an impeller and a motor shell; the motor is characterized by further comprising two bearing mounting structures, wherein a stopping part is designed on the bearing mounting structure close to one end of the impeller; a space for arranging a pre-pressure piece is reserved in the bearing mounting structure far away from one end of the impeller; bearings are respectively arranged in the two bearing mounting structures; the motor further comprises a pre-pressure washer and a pre-pressure spring, the pre-pressure washer is arranged in the bearing mounting structure close to one end of the impeller and abuts against the outer ring of the bearing, the pre-pressure spring is arranged in the space and abuts against the outer ring of the bearing, and the pre-pressure of the pre-pressure spring is greater than the pre-pressure of the pre-pressure washer.

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