CN111564926A - Motor rotating shaft and motor with same - Google Patents
Motor rotating shaft and motor with same Download PDFInfo
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- CN111564926A CN111564926A CN201910114054.3A CN201910114054A CN111564926A CN 111564926 A CN111564926 A CN 111564926A CN 201910114054 A CN201910114054 A CN 201910114054A CN 111564926 A CN111564926 A CN 111564926A
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- bearing
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- rotating shaft
- motor shaft
- surface portions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
Abstract
The invention discloses a motor rotating shaft and a motor with the same, wherein the motor rotating shaft is provided with a bearing mounting position for sleeving a bearing, the peripheral surface of the bearing mounting position comprises at least three matching surface parts and at least one recessed surface part, each matching surface part is positioned on the same cylindrical surface, at least one recessed surface part is arranged between every two adjacent matching surface parts, and each recessed surface part is positioned on the inner side of the cylindrical surface. The motor rotating shaft disclosed by the invention is simple in structure and low in operation noise.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to a motor rotating shaft and a motor with the same.
Background
In the related art, a motor in a washing machine generally drives a drum of the washing machine to rotate through belt transmission, so as to complete washing processes such as rinsing, spin-drying and the like; however, the washing machine may generate noise with a frequency 2 times of the motor frequency in the operation process, that is, the washing machine generates vibration noise with a frequency 2 times of the motor frequency, so that the user experience is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the motor rotating shaft which effectively reduces noise in the operation process.
The invention also provides a motor with the motor rotating shaft.
According to the motor rotating shaft provided by the embodiment of the first aspect of the invention, the motor rotating shaft is provided with the bearing installation position for sleeving the bearing, the outer peripheral surface of the bearing installation position comprises at least three matching surface parts and at least one recessed surface part, each matching surface part is positioned on the same cylindrical surface, at least one recessed surface part is arranged between every two adjacent matching surface parts, and each recessed surface part is positioned on the inner side of the cylindrical surface.
According to the motor rotating shaft provided by the embodiment of the invention, by arranging the bearing mounting position, when the motor rotating shaft is applied to a motor, the bearing mounting position forces the inner peripheral wall of the bearing to generate micro-deformation tending to the shape of the bearing mounting position, so that the operation noise of the motor rotating shaft applied to electric appliances such as a washing machine is reduced, and the sound quality of the motor is improved.
According to some embodiments of the invention, the number of the fitting surface portions and the number of the recessed surface portions are the same and the fitting surface portions and the recessed surface portions are alternately arranged so that one recessed surface portion is provided between every two adjacent fitting surface portions.
According to some embodiments of the present invention, a length of the fitting surface portion is equal to a length of the bearing mounting portion or/and a length of the recessed surface portion is equal to a length of the bearing mounting portion in an axial direction of the motor rotating shaft.
According to some embodiments of the invention, the recessed face portion is a flat surface, or a curved surface, or a combination of a flat surface and a curved surface.
According to some embodiments of the invention, a central angle a of each of the mating face portions1Are all equal.
According to some embodiments of the invention, the angle a between each two adjacent mating surface portions2Are all equal.
According to some embodiments of the invention, a central angle a of each of the mating face portions1Are all equal, and the included angle a between every two adjacent matching surface parts2Are all equal to each other, and a1＝a2。
According to some embodiments of the invention, the motor shaft has a pulley mounting location for sleeving a pulley.
According to some embodiments of the invention, the bearing mounting positions are plural, and the plural bearing mounting positions are spaced apart in a length direction of the motor rotating shaft.
According to a second aspect embodiment of the invention, an electric machine comprises: a motor shaft according to the embodiment of the first aspect of the present invention; and the bearing is sleeved on the bearing mounting position, the matching surface is in interference fit with the bearing, and the sunken surface is in clearance fit with the bearing.
According to the motor provided by the embodiment of the invention, by adopting the motor rotating shaft, the operation noise of the motor is reduced, the sound quality of the motor is improved, and the motor has good product performance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of a motor shaft according to one embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the bearing mounting location and bearing assembly shown in FIG. 1;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 5 is an enlarged view of section C circled in FIG. 1;
FIG. 6 is an enlarged view of section D circled in FIG. 1;
fig. 7 is a sectional view of a motor shaft according to another embodiment of the present invention;
FIG. 8 is a schematic view of the bearing mounting location and bearing assembly of FIG. 7;
fig. 9 is a sectional view of a rotating shaft of a motor according to still another embodiment of the present invention;
fig. 10 is a sectional view of a motor shaft according to still another embodiment of the present invention;
FIG. 11 is a schematic view of a portion of a motor according to one embodiment of the present invention;
FIG. 12 is another partial schematic view of the motor shown in FIG. 11;
fig. 13 is a cross-sectional view of a motor according to yet another embodiment of the present invention;
fig. 14 is a side view of the motor shown in fig. 13.
Reference numerals:
a motor 100,
A motor rotating shaft 1, a cylindrical surface 10a, a central axis 10b of the motor rotating shaft,
A belt pulley mounting position 12, a knurl 121,
A shaft shoulder 14, a tool withdrawal groove 15, a magnetic part installation position 16, a fixing hole 160,
A bearing 2, an inner peripheral wall 20, an inner ring 21, an outer ring 22, rolling elements 23,
A belt pulley 4, a commutator 5, a dust-proof washer 6, a magnetic member 7, a fastener 71, a stator 8,
A first case 91 and a second case 92.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In view of the technical problems in the related art, the inventor of the present invention has found through research and analysis that the 2-times rotational frequency vibration noise is generated during the operation of the washing machine because the bearing inner ring is deformed elliptically, and the elliptically-shaped deformation is amplified under the action of the electromagnetic force of the stator and the rotor, the force applied by the driven member such as a pulley, and the like, thereby causing the vibration noise of the washing machine at the frequency. However, due to the limitation of the manufacturing process, the bearing inner ring inevitably has an out-of-round phenomenon, and detection shows that most of the bearing inner rings are elliptical, and the bearing is matched with the motor rotating shaft to easily cause vibration noise with the frequency 2 times of the motor rotating frequency, and the motor rotating shaft is subjected to external force, so that the vibration noise with the frequency 2 times is more obvious. Aiming at the reasons, the inventor improves the motor rotating shaft to obtain the technical scheme of the invention.
A motor shaft 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, fig. 2, and fig. 7-fig. 10, according to the motor shaft 1 of the embodiment of the present invention, the motor shaft 1 has a bearing installation location 11 for sleeving the bearing 2, and the bearing 2 can be installed on the bearing installation location 11 to support the motor shaft 1, so as to realize the rotation of the motor shaft 1; bearing installation position 11's outer peripheral face includes cooperation face 111 and sunken face 112, cooperation face 111 is at least three and every cooperation face 111 all is located same face 10a, a plurality of cooperation faces 111 can set up along motor shaft 1's circumference interval, be equipped with at least one sunken face 112 between every two adjacent cooperation faces 111, be equipped with one or more sunken face 112 between every two adjacent cooperation faces 111 promptly, then sunken face 112 is at least three, every sunken face 112 all is located the inboard of face 10 a.
When the bearing 2 is mounted on the motor rotating shaft 1, each of the fitting surface portions 111 is in contact fit with the inner circumferential wall 20 of the bearing 2, for example, each of the fitting surface portions 111 may be in interference fit with the bearing 2, and since the recessed surface portion 112 is located inside the cylindrical surface 10a corresponding to the plurality of fitting surface portions 111, each of the recessed surface portions 112 is spaced apart from the inner circumferential wall 20 of the bearing 2 except for an end portion connected to the fitting surface portion 111. Because the inner peripheral wall 20 of the bearing 2 is matched with the bearing installation position 11, the bearing installation position 11 forces the inner peripheral wall 20 of the bearing 2 to deform slightly, so that the shape of the deformed inner peripheral wall 20 of the bearing 2 tends to be similar to the shape of the bearing installation position 11, for example, the bearing 2 is a rolling bearing 2, the inner ring 21 of the bearing 2 deforms slightly, so that the shape of the deformed inner ring 21 tends to be similar to the shape of the bearing installation position 11, and when the motor rotating shaft 1 is applied to an electrical appliance such as a washing machine and the electrical appliance generates 2 times of frequency conversion vibration noise due to the elliptical deformation of the inner peripheral wall 20 of the bearing 2 caused by factors such as manufacturing process, assembly relation with the motor rotating shaft 1 and the like, the 2 times of frequency conversion vibration noise in the operation process of the electrical appliance such as the washing machine; and because the inner peripheral wall 20 of the bearing 2 is prevented from generating elliptical deformation, 2 times of frequency conversion vibration generated when the motor rotating shaft 1 is applied to an electric appliance such as a washing machine can be forcibly converted into 3 times of frequency conversion vibration or other times of frequency conversion vibration, so that the vibration frequency of the motor rotating shaft 1 in the rotating process is increased, and the energy of the generated vibration is basically ensured to be unchanged, thereby reducing the vibration amplitude of the motor rotating shaft 1 and ensuring the noise reduction effect.
The 2-time frequency conversion vibration noise can be understood as noise with the frequency 2 times of the frequency of the motor, the 2-time frequency conversion vibration can be understood as vibration with the frequency 2 times of the frequency of the motor, the 3-time frequency conversion vibration can be understood as vibration with the frequency 3 times of the frequency of the motor, and the like. The motor frequency can be understood as the rotational frequency of the motor shaft 1.
When the motor shaft 1 is applied to the motor 100, the rotor 3 is connected with the motor shaft 1 to synchronously rotate with the motor shaft 1, the stator 8 can be sleeved in the rotor 3 and also can be sleeved outside the rotor 3, and the elliptical deformation of the inner peripheral wall 20 of the bearing 2 is forcibly prevented by the motor shaft 1, so that the nonuniformity of an air gap between the rotor 3 and the stator 8 caused by the elliptical deformation of the inner peripheral wall 20 of the bearing 2 is avoided, the low-frequency electromagnetic noise of the motor 100 is reduced, the vibration of the motor 100 is reduced, and the vibration noise of the motor 100 is reduced.
The number of the bearing installation positions 11 can be one or more; when the number of the bearing installation positions 11 is plural, the plural bearing installation positions 11 may be arranged at intervals along the axial direction of the motor rotating shaft 1, but is not limited thereto; when the bearing mounting positions 11 are plural, the structures of the plural bearing mounting positions 11 may be the same or may not be completely the same, that is, the shapes of the outer peripheral surfaces of the plural bearing mounting positions 11 may be the same or may not be completely the same, and the outer peripheral surface of at least one of the plural bearing mounting positions 11 includes the fitting surface portion 111 and the recessed surface portion 112. In the axial direction of the motor rotating shaft 1, the length of the bearing installation position 11 can be specifically set according to actual requirements. In the description of the present invention, "a plurality" means two or more.
Here, the direction "inside" refers to a direction close to the central axis 10b of the motor shaft.
According to the motor rotating shaft 1 of the embodiment of the invention, by arranging the bearing installation position 11, the outer peripheral surface of the bearing installation position 11 comprises the recessed surface part 112 and at least three matching surface parts 111, each matching surface part 111 is positioned on the same cylindrical surface 10a, and the recessed surface part 112 is positioned on the inner side of the cylindrical surface 10a, so that when the motor rotating shaft 1 is applied to the motor 100, the bearing 2 is installed on the bearing installation position 11, the bearing installation position 11 forces the inner peripheral wall 20 of the bearing 2 to generate micro-deformation which tends to the shape of the bearing installation position 11, and 2-time rotation frequency vibration noise generated when the motor rotating shaft 1 is applied to an electric appliance such as a washing machine due to elliptical deformation of the inner peripheral wall 20 of the bearing 2 is avoided, so that the operation noise is reduced, the sound quality of the motor 100 is.
Furthermore, the inventor found through research and analysis that when the number of the fitting surface portions 111 of the outer peripheral surface of the bearing mounting site 11 is two, the technical problem existing in the related art cannot be solved, that is, when the number of the fitting surface portions 111 of the outer peripheral surface of the bearing mounting site 11 is two, instead of three or more, the bearing mounting site 11 is fitted with the bearing 2, and the high 2-times rotational frequency vibration noise still exists when the motor rotating shaft 1 is applied to an electric appliance such as a washing machine.
It can be understood that, when one recessed surface portion 112 is provided between two adjacent mating surface portions 111, both circumferential ends of the recessed surface portion 112 are respectively connected to the two mating surface portions 111; when a plurality of recessed surface portions 112 are provided between two adjacent mating surface portions 111, the plurality of recessed surface portions 112 may be sequentially connected in the circumferential direction of the motor rotating shaft 1, and both ends in the circumferential direction of the plurality of recessed surface portions 112 are respectively connected to the two mating surface portions 111.
Optionally, because a plurality of cooperation face portions 111 all are located same face 10a, every cooperation face portion 111 all forms the arc surface and the radius that a plurality of cooperation face portions 111 correspond the arc surface equals, motor shaft 1 is in the course of working, a plurality of cooperation face portions 111 can adopt lathe machining, thereby easily guarantee the precision of a plurality of cooperation face portions 111 of bearing installation position 11, and easily guarantee the requirement of the axiality between a plurality of cooperation face portions 111, guarantee that a plurality of cooperation face portions 111 are located same face 10 a. Of course, the plurality of fitting surface portions 111 may be processed in other manners without being limited thereto.
In addition, since each recessed surface portion 112 is located inside the cylindrical surface 10a, the plurality of recessed surface portions 112 may be non-machined surfaces or surfaces to be machined, which are reserved in the casting process, in the machining process of the motor rotating shaft 1, that is, after the casting process is completed, the recessed surface portions 112 may not be machined or may be machined in the subsequent machining process. Therefore, the processing requirements of the concave surface part 112 are reduced, the processing procedure of the motor rotating shaft 1 is simplified, and the processing efficiency of the motor rotating shaft 1 is improved.
In some embodiments of the present invention, the number of the fitting surface portions 111 is the same as that of the recessed surface portions 112, and the plurality of fitting surface portions 111 and the plurality of recessed surface portions 112 are alternately arranged, so that one recessed surface portion 112 is provided between every two adjacent fitting surface portions 111, and one fitting surface portion 111 is provided between every two adjacent recessed surface portions 112, thereby simplifying the structure of the bearing mounting location 11 and facilitating the processing of the bearing mounting location 11. For example, in the example of fig. 2, the fitting surface portions 111 and the recessed surface portions 112 may be four, respectively, the four fitting surface portions 111 and the four recessed surface portions 112 are alternately arranged in the circumferential direction of the motor rotation shaft 1, one recessed surface portion 112 is provided between every two adjacent fitting surface portions 111, and one fitting surface portion 111 is provided between every two adjacent recessed surface portions 112. For another example, in the examples of fig. 7, 9, and 10, the fitting surface portions 111 and the recessed surface portions 112 may be three, respectively, the three fitting surface portions 111 and the three recessed surface portions 112 are alternately arranged in the circumferential direction of the motor rotation shaft 1, one recessed surface portion 112 is provided between every two adjacent fitting surface portions 111, and one fitting surface portion 111 is provided between every two adjacent recessed surface portions 112.
It is understood that the fitting surface portion 111 and the recessed surface portion 112 may be provided as five or more, respectively.
Of course, the number of the matching surface portions 111 and the number of the recessed surface portions 112 may also be different, for example, the number of the recessed surface portions 112 may be larger than the number of the matching surface portions 111, and in this case, one or more recessed surface portions 112 may be provided between two adjacent matching surface portions 111.
Specifically, in the axial direction of the motor rotating shaft 1, the length of the fitting surface portion 111 is equal to the length of the bearing mounting position 11, or/and the length of the recessed surface portion 112 is equal to the length of the bearing mounting position 11. Therefore, on the premise of ensuring that 2 times of frequency conversion vibration noise generated when the motor rotating shaft 1 is applied to an electric appliance such as a washing machine is reduced, the bearing mounting position 11 has good design flexibility, so that a proper processing mode can be selected according to the specific structure of the bearing mounting position 11.
In some optional embodiments of the present invention, in the axial direction of the motor rotating shaft 1, the length of the fitting surface portion 111 is equal to the length of the bearing mounting location 11, and at this time, in the axial direction of the motor rotating shaft 1, the length of the recessed surface portion 112 may be equal to or may not be equal to the length of the bearing mounting location 11, for example, the length of the recessed surface portion 112 may be smaller than the length of the bearing mounting location 11.
In other alternative embodiments of the present invention, the length of the recessed surface portion 112 is equal to the length of the bearing mounting location 11 in the axial direction of the motor rotating shaft 1, and at this time, the length of the matching surface portion 111 may be equal to or different from the length of the bearing mounting location 11 in the axial direction of the motor rotating shaft 1, for example, the length of the matching surface portion 111 may be smaller than the length of the bearing mounting location 11.
In still other alternative embodiments of the present invention, as shown in fig. 1, in the axial direction of the motor rotating shaft 1, the length of the fitting surface portion 111 is equal to the length of the bearing mounting location 11, and the length of the recessed surface portion 112 is equal to the length of the bearing mounting location 11, at this time, the structure of the bearing mounting location 11 is relatively regular and easy to implement, and it is effectively ensured that the bearing mounting location 11 can force the inner peripheral wall 20 of the bearing 2 to deform slightly, so that the shape of the inner peripheral wall 20 of the bearing 2 tends to the bearing mounting location 11.
Alternatively, the recessed face portion 112 is a flat surface, or a curved surface, or a combination of a flat surface and a curved surface, that is, the entire recessed face portion 112 is formed as a flat surface, or the entire recessed face portion 112 is formed as a curved surface, or a part of the recessed face portion 112 is formed as a flat surface and another part is formed as a curved surface. Therefore, the concave surface portion 112 has good design flexibility, so that the specific structure of the bearing mounting position 11 can be set according to actual requirements, processing modes and the like, and actual application can be better met.
For example, in the example of fig. 2 and 7, the plurality of recessed face portions 112 are each formed as a plane, so that the recessed face portions 112 are simple in structure and easy to process; for another example, in the example of fig. 9, the plurality of recessed surface portions 112 are each formed as a curved surface, ensuring design flexibility of the structure of the recessed surface portions 112. The curved surface can be a cambered surface (including a circular arc surface and an elliptic cambered surface), a paraboloid, a wavy surface and the like.
It is understood that the shapes of the plurality of recessed face portions 112 may or may not all be the same; for example, in the example of fig. 10, at least one of the plurality of recessed surface portions 112 is formed as a flat surface, and the rest are formed as a curved surface.
In some embodiments of the invention, as shown in fig. 2, 7, 9 and 10, the central angle a of each mating face portion 1111The equal to each other to the atress of a plurality of cooperation face portions 111 is balanced, guarantees the atress equilibrium of bearing installation position 11, has promoted the use reliability of bearing installation position 11. For example, a1May be 45 °, or 60 °, or 70 °, etc.
Wherein the central angle a of the fitting surface portion 1111May refer to an angle formed by the projection of the central axis of the cylindrical surface 10a (i.e., the central axis 100b of the motor shaft) on the cross section of the bearing installation site 11, and the radius of the projection of the two circumferential ends of the fitting surface 111.
Of course, the central angle a of the plurality of fitting surface portions 1111It is also possible that at least one of the mating surfaces 111 is not completely equal, that is, at least one of the mating surfacesCentral angle a of portion 1111Central angle a with the remaining fitting surface portion 1111Unequal, thereby reducing the processing requirement of the bearing installation position 11 to a certain extent, simplifying the processing procedure of the bearing installation position 11 and facilitating the processing of the bearing installation position 11.
Specifically, as shown in fig. 2, 7, 9, and 10, the included angle a between each adjacent two of the fitting surface portions 1112Are all equal, and at this time, the plurality of matching surface portions 111 can be arranged at even intervals along the circumferential direction of the motor rotating shaft 1. Wherein, when a recessed surface portion 112 is provided between two adjacent matching surface portions 111, two circumferential ends of the recessed surface portion 112 are respectively connected with the two matching surface portions 111, and an included angle a between two adjacent matching surface portions 1112Can be an angle formed by the projected radiuses of the two circumferential ends of the concave surface part 112 on the cross section of the bearing installation position 11 by taking the projection of the central axis of the cylindrical surface 10a as the center of a circle; when a plurality of recessed surface portions 112 are formed between two adjacent mating surface portions 111, the recessed surface portions 112 may be sequentially connected, two circumferential ends of the recessed surface portions 112 are respectively connected to the two mating surface portions 111, and an included angle a between two adjacent mating surface portions 1112May refer to an angle formed by the projected radii of the two circumferential ends of the plurality of recessed surface portions 112 on the cross section of the bearing installation site 11, with the projection of the central axis of the cylindrical surface 10a as the center of the circle.
Of course, the angle a between two adjacent mating surface portions 1112It is also possible that the angles a formed between each adjacent two of the mating face portions 111 are not all equal, that is, the angles a2In and at least one included angle a2At an angle a with respect to the rest2Unequal, thereby reducing the processing requirement of the bearing mounting position 11 to a certain extent, simplifying the processing procedure of the bearing mounting position 11 and facilitating the processing of the bearing mounting position 11.
In some embodiments of the invention, the central angle a of each mating face portion 1111Are all equal, and the included angle a between every two adjacent matching surface parts 1112Are all equal to each other, and a1＝a2. Therefore, the cross section area of the bearing mounting position 11 is convenient to ensure to be larger, so that the strength, the rigidity and the like of the bearing mounting position 11 are ensured, and the bearing mounting position is convenient to useThe bearing mounting position 11 has good use reliability.
It will be appreciated that when the central angle a of each mating face portion 111 is defined1Equal included angle a between every two adjacent matching surface parts 1112Are all equal, a1Can also be reacted with a2Not equal; for example, when the fitting surface portion 111 and the recessed surface portion 112 are three, respectively, a1＝70°、a250 °, or a1＝50°、a270 °, for example, when the fitting surface portion 111 and the recessed surface portion 112 are four, respectively, a1＝60°、a230 °, or a1＝40°、a2But is not limited to 50 °.
Further, when the central angle a of each fitting face portion 1111When they are equal, the included angle a between two adjacent matching surface parts 1112May not be completely equal; for example, when the fitting surface portion 111 and the recessed surface portion 112 are three, respectively, a1Are both 70 degrees, and the included angle a between two adjacent matching surface parts 1112May be 40 °, 50 °, 60 °, respectively, and further, for example, a when the fitting face portion 111 and the recessed face portion 112 are four, respectively1Are all 60 degrees, and the included angle a between two adjacent matching surface parts 1112Can be respectively 20 degrees, 30 degrees and 40 degrees; but is not limited thereto. When the central angle a of the plurality of fitting surface parts 1111When the two surfaces are not completely equal, the included angle a between two adjacent matching surface parts 1112May or may not be all equal; for example, when the fitting surface portions 111 and the recessed surface portions 112 are three, respectively, the central angles a of the three fitting surface portions 1111Can be respectively 60 degrees, 70 degrees and 80 degrees, and the included angle a between every two adjacent matching surface parts 1112May be both 50 °, and for example, when the fitting face portion 111 and the recessed face portion 112 are three, respectively, the central angles a of the three fitting face portions 1111Can be respectively 40 degrees, 50 degrees and 60 degrees, and the included angle a between two adjacent matching surface parts 1112Can be both 50 degrees, 80 degrees and 80 degrees; but is not limited thereto.
Specifically, in the example of fig. 1 and 11-13, the motor shaft 1 has a pulley mounting position 12 for sleeving the pulley 4, and the pulley 4 can be mounted on the pulley mounting position 12 to be driven by the motor shaft 1 to rotate; a spiral groove is formed on the peripheral surface of the belt pulley 4, when the motor rotating shaft 1 drives the belt pulley 4 to rotate, the belt pulley 4 is matched with a tensioned conveying belt, the conveying belt exerts acting force on the motor rotating shaft 1 through the belt pulley 4, so that the motor rotating shaft 1 is bent, and at the moment, if the motor rotating shaft 1 still adopts the structure in the traditional technology, 2 times of frequency conversion vibration noise is more remarkable when the motor rotating shaft 1 is applied to an electric appliance such as a washing machine; in the present application, the outer peripheral surface of the bearing installation site 11 is configured to include the fitting surface portion 111 and the recessed surface portion 112, so as to avoid the elliptical deformation of the inner peripheral wall 20 of the bearing 2, and reduce the 2-fold rotational frequency vibration noise when the motor shaft 1 is applied to an electrical appliance such as a washing machine.
Optionally, as shown in fig. 1 and fig. 11, a knurl 121 is formed on an outer circumferential surface of the pulley mounting location 12, the pulley 4 may be formed substantially in a cylindrical structure, the pulley 4 is sleeved on the pulley mounting location 12 so as to enable an inner circumferential wall of the pulley 4 to be matched with the knurl 121, thereby achieving a tight fit between the pulley 4 and the motor rotating shaft 1, limiting a relative movement between the pulley 4 and the motor rotating shaft 1 along a circumferential direction of the motor rotating shaft 1, and ensuring that the pulley 4 and the motor rotating shaft 1 rotate synchronously. Of course, the synchronism of the pulley 4 and the rotation of the motor shaft 1 can be achieved by other means, but is not limited thereto.
In some embodiments of the present invention, the number of the bearing installation sites 11 is multiple, and the multiple bearing installation sites 11 are spaced apart in the length direction of the motor rotating shaft 1, so that when the motor rotating shaft 1 is applied to the motor 100, the motor rotating shaft 1 can be stably supported by the fewer bearings 2, so as to reduce the cost of the motor 100, and meanwhile, the number of the bearing installation sites 11 can be correspondingly set to be smaller, so as to reduce the processing cost of the motor rotating shaft 1.
For example, in the example of fig. 1 and 11-13, there are two bearing mounting locations 11, two bearing mounting locations 11 are spaced apart along the axial direction of the motor rotating shaft 1, and each bearing mounting location 11 may be provided with one bearing 2. It is understood that the number of the bearing mounting positions 11 may be three or more.
Of course, when the bearing installation site 11 is plural, at least two of the plural bearing installation sites 11 may be disposed at non-intervals, that is, at least two of the plural bearing installation sites 11 may be disposed next to each other, and the bearing 2 may also support the motor shaft 1 when being installed at the bearing installation site 11.
The motor 100 according to the embodiment of the second aspect of the present invention includes a motor shaft 1 and a bearing 2, and the motor shaft 1 is the motor shaft 1 according to the embodiment of the first aspect of the present invention.
Specifically, as shown in fig. 11 to 14, the bearing 2 is sleeved on the bearing installation site 11, the fitting surface 111 is in interference fit with the bearing 2, the recessed surface 112 is in clearance fit with the bearing 2, and the bearing installation site 11 forces the inner circumferential wall 20 of the bearing 2 to deform slightly, so that the shape of the inner circumferential wall 20 of the deformed bearing 2 tends to be similar to the shape of the bearing installation site 11, thereby avoiding the inner circumferential wall 20 of the bearing 2 from deforming in an elliptical shape, and reducing the 2-fold frequency-conversion vibration noise when the motor rotating shaft 1 is applied to an electrical appliance such as a washing machine.
According to the motor 100 provided by the embodiment of the invention, by adopting the motor rotating shaft 1, the operation noise of the motor 100 is reduced, the sound quality of the motor 100 is improved, and the motor 100 has good product performance; when the motor 100 is applied to an electric appliance such as a washing machine, the motor 100 may drive the drum of the washing machine to rotate, thereby effectively reducing the operation noise of the washing machine and improving the use experience effect of a user.
In the operation process of the motor 100, the rotor 3 is subjected to an acting force due to the matching of the rotor 3 and the stator 8, and the rotor 3 transmits the acting force to the motor rotating shaft 1 to bend the motor rotating shaft 1, so that 2 times of frequency conversion vibration noise is generated in the operation process of the motor 100; in the application, the outer peripheral surface of the bearing mounting position 11 is set to include the matching surface portion 111 and the recessed surface portion 112, so that the inner peripheral wall 20 of the bearing 2 is prevented from elliptical deformation, and 2 times of frequency conversion vibration noise in the rotating process of the motor rotating shaft 1 is reduced.
In some embodiments of the present invention, as shown in fig. 1, 11-13, the motor 100 may be an internal rotor motor (the rotor 3 is sleeved in the stator 8), the motor shaft 1 has a rotor mounting location 13 for sleeving the rotor 3, and the rotor 3 may be mounted at the rotor mounting location 13 to rotate synchronously with the motor shaft 1; can be formed with arris groove 131 on the outer peripheral face of rotor installation position 13, arris groove 131 sets up along motor shaft 1's circumference interval for a plurality of and a plurality of arris grooves 131, and 3 covers of rotor are established on rotor installation position 13 so that the internal perisporium and the cooperation of arris groove 131 of rotor 3, realize rotor 3 and motor shaft 1's tight fit, and the relative motion of circumference along motor shaft 1 of restriction rotor 3 and motor shaft 1 guarantees 3 synchronous rotations of rotor motor shaft 1.
Of course, the motor 100 may also be an external rotor motor (the rotor 3 is sleeved outside the stator 8); the synchronous rotation between the rotor 3 and the motor shaft 1 can also be realized by other means, but is not limited thereto.
In the example of fig. 4, the plurality of rib grooves 131 are uniformly spaced along the circumferential direction of the motor shaft 1, each rib groove 131 may include a rib groove protrusion 1311 and a rib groove recess 1312, which are disposed next to each other, the rib groove protrusion 1311 may be formed by protruding a part of the outer circumferential surface of the rotor mounting location 13 outward, and the rib groove recess 1312 may be formed by recessing a part of the outer circumferential surface of the rotor mounting location 13 inward, which ensures a tight fit between the rotor 3 and the motor shaft 1.
Optionally, as shown in fig. 1, 5, 6, 11 and 12, the motor shaft 1 has a shoulder 14 thereon, and the shoulder 14 is located at the end of the bearing mounting location 11 for limiting the axial movement of the bearing 2 and facilitating the machining of the bearing mounting location 11. The shaft shoulder 14 may be a shaft shoulder 14 with a relief groove 15, and both axial ends of the relief groove 15 form fillet transition respectively to reduce stress concentration of the motor rotating shaft 1. Of course, the shaft 1 may also be formed without a shoulder 14 (e.g., as shown in fig. 13).
Further, as shown in fig. 1, 11-13, the motor shaft 1 has a magnetic member mounting location 16 for sleeving the magnetic member 7, the magnetic member 7 can be mounted on the magnetic member mounting location 16 to rotate synchronously with the motor shaft 1, the magnetic member 7 can generate a magnetic field, and the magnetic member 7 can cooperate with a hall sensor of the motor 100 to obtain the rotation speed of the motor shaft 1. The magnetic member 7 may be formed as a magnetic ring, but is not limited thereto.
Alternatively, in the example of fig. 1, 11-13, the magnetic member mounting location 16 may be located at an end of the motor shaft 1, a fixing hole 160 is formed on an end surface of the motor shaft 1, at least a portion of the magnetic member 7 may be sleeved on the magnetic member mounting location 16, and a fastening member 71 is inserted into the fixing hole 160 to fixedly mount the magnetic member 7 on the magnetic member mounting location 16.
Specifically, as shown in fig. 11 to 13, the rotor 3 may adopt a winding excitation form, the rotor 3 includes a rotor core 31 and a rotor winding 32, the rotor core 31 includes a plurality of silicon steel sheets stacked in an axial direction of the motor rotating shaft 1, a plurality of rotor teeth are formed on the rotor core 31, a rotor slot is defined between two adjacent rotor teeth, and the rotor winding 32 is wound on the plurality of rotor teeth in a certain winding manner; the rotor slots penetrate through the outer circumferential surface of the rotor core 31 to form openings 311, noise reduction members 310 are provided at the openings 311, and the noise reduction members 310 are fitted to the openings 311 to restrict the rotor windings 32 from being separated from the rotor slots through the openings 311 to cause loosening of the rotor windings 32, while preventing the rotor 3 from generating aerodynamic noise during high-speed rotation.
The opening 311 may penetrate through both ends of the rotor core 31 in the axial direction of the motor rotation shaft 1, and the extending direction of the opening 311 may be parallel to the axial direction of the motor rotation shaft 1 or may be inclined with respect to the axial direction of the motor rotation shaft 1.
Of course, the rotor 3 may also take the form of permanent magnet excitation, for example, the rotor 3 includes a rotor core 31 and permanent magnets.
Further, as shown in fig. 11-13, an insulating member 33 is disposed at one axial end of the rotor core 31, the insulating member 33 is tightly fitted with the motor shaft 1 to rotate synchronously with the motor shaft 1, and the insulating member 33 can be fitted with the rotor winding 32 to accommodate the end of the rotor winding 32 for insulation and accommodation; the commutator 5 is arranged at the other axial end of the rotor core 31, and the rotor winding 32 is connected with the commutator 5 in a matching manner through a groove structure of the commutator 5, so that the rotor winding 32 is ensured to be supplied with power through the commutator 5.
In the example of fig. 12 and 13, the commutator 5 is disposed adjacent to the bearing 2, and a dust-proof gasket 6 is disposed between the commutator 5 and the bearing 2, the dust-proof gasket 6 can abut against the bearing 2, and since the commutator 5 is equipped with a brush (or called carbon brush), the dust-proof gasket 6 can prevent carbon powder generated during the operation of the brush from flying into the bearing 2 to affect the normal operation of the bearing 2, thereby playing a role of dust prevention.
A motor shaft 1 according to an embodiment of the present invention will be described in detail in four specific embodiments with reference to fig. 1 to 10. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
Example one
In the present embodiment, as shown in fig. 1-6, the motor shaft 1 has two bearing mounting locations 11, a pulley mounting location 12, a rotor mounting location 14 and a magnetic member mounting location 16. Two bearing installation positions 11 are respectively used for sleeving the bearing 2, a belt pulley installation position 12 is used for sleeving the belt pulley 4, a rotor installation position 14 is used for installing the rotor 3, and a magnetic part installation position 16 is used for installing the magnetic part 7.
The two bearing mounting positions 11 are arranged at intervals along the axial direction of the motor rotating shaft 1, the belt pulley mounting position 12 is positioned at one axial end of the motor rotating shaft 1, the belt pulley mounting position 12 is positioned at one side, far away from the other side, of one of the two bearing mounting positions 11, and a central hole is formed at one end of the bearing of the motor rotating shaft 1, so that the motor rotating shaft 1 can be positioned in the machining process; knurling 121 is formed on the outer peripheral surface of the belt pulley mounting position 12 so as to realize tight fit of the belt pulley mounting position 12 and the belt pulley 4; the rotor installation position 14 is located between the two bearing installation positions 11, a plurality of edge grooves 131 are formed in the outer peripheral surface of the rotor installation position 14, and the edge grooves 131 are uniformly arranged at intervals along the circumferential direction of the motor rotating shaft 1 so as to realize the tight fit between the rotor installation position 14 and the rotor 3; the magnetic member mounting position 16 is located at the other axial end of the motor rotating shaft 1, the magnetic member mounting position 16 is located at a side of the other one of the two bearing mounting positions 11 away from the one, the magnetic member 7 can be fixedly mounted on the magnetic member mounting position 16 through a fastening member 71, and the fastening member 71 can be a screw.
Specifically, the outer peripheral surface of each bearing mounting position 11 includes four fitting surface portions 111 and four recessed surface portions 112, the four fitting surface portions 111 and the four recessed surface portions 112 are alternately arranged along the circumferential direction of the motor rotating shaft 1, so that one recessed surface portion 112 is provided between every two adjacent fitting surface portions 11, one fitting surface portion 111 is provided between every two adjacent recessed surface portions 112, the four fitting surface portions 111 are all located on the same cylindrical surface 10a, and the four recessed surface portions 112 are all located on the inner side of the cylindrical surface 10 a; in the axial direction of the motor shaft 1, the length of the fitting surface portion 111 is equal to the length of the corresponding bearing mounting position 11, and the length of the recessed surface portion 112 is equal to the length of the corresponding bearing mounting position 11. Wherein each recessed face portion 112 is formed as a plane.
The bearing 2 is a metal part, and the bearing 2 is a rolling bearing (such as a ball bearing), the bearing 2 includes an annular inner ring 21, an annular outer ring 22 and rolling bodies 23 located between the inner ring 21 and the outer ring 22, the rolling bodies 23 may be formed into a spherical structure, the inner ring 21 is disposed in the outer ring 22 at intervals, and the inner ring 21 is rotatable relative to the outer ring 22 through the rolling bodies 23; when the bearing 2 is mounted on the bearing mounting position 11, the four fitting surface portions 111 are in interference fit with the inner ring 21 of the bearing 2, and the four recessed surface portions 112 are all arranged at intervals with the inner peripheral wall 20 of the bearing 2, and the bearing mounting position 11 forces the inner ring 21 of the bearing 2 to deform slightly, so that the shape of the deformed inner ring 21 tends to be similar to that of the bearing mounting position 11, for example, the inner ring 21 can deform slightly in a "polygon" (e.g., quadrilateral) shape, and 2-time rotation frequency vibration noise caused when the motor rotating shaft 1 is applied to an electric appliance such as a washing machine due to elliptical deformation of the inner ring 21 of the bearing 2 is avoided, thereby reducing the operation noise of the motor rotating shaft.
Specifically, as shown in fig. 2, the central angle a of each fitting surface portion 1111Are all equal, and the included angle a between every two adjacent matching surface parts 1112Are all equal to each other, and a1＝a2(ii) a In other words, the central angles a of the four fitting surface parts 1111Are all 45 degrees, and the included angle a between every two adjacent matching surface parts 1112Are all 45 degrees.
As shown in fig. 1, 5 and 6, the motor shaft 1 has a shoulder 14 thereon, and the shoulder 14 is located at an end of the bearing mounting location 11 for limiting axial movement of the bearing 2 and facilitating machining of the bearing mounting location 11. Wherein, the shaft shoulder 14 is a shaft shoulder 14 with a tool withdrawal groove 15, and two axial ends of the tool withdrawal groove 15 respectively form fillet transition.
The motor rotating shaft 1 provided by the embodiment of the invention has the advantages of simple structure and convenience in implementation, and meanwhile, when the motor rotating shaft 1 is applied to the motor 100, the running noise of the motor 100 can be effectively reduced, the product performance of the motor 100 is improved, and the motor 100 has good working performance.
Example two
As shown in fig. 7 to 8, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the outer peripheral surface of the bearing mounting position 11 comprises three matching surface parts 111 and three sunken surface parts 112, the three matching surface parts 111 and the three sunken surface parts 112 are alternately arranged along the circumferential direction of the motor rotating shaft 1, and the central angles a of the three matching surface parts 1111Are all 60 degrees, and the included angle a between every two adjacent matching surface parts 1112Are all 60 degrees.
When the bearing installation position 11 is installed in cooperation with the bearing 2, the bearing installation position 11 forces the inner ring 21 of the bearing 2 to generate triangular micro-deformation, so that 2-time rotation frequency vibration noise caused by elliptical deformation of the inner ring 21 of the bearing 2 when the motor rotating shaft 1 is applied to the motor 100 or an electric appliance is avoided, and the operation noise of the motor 100 and the electric appliance is reduced.
EXAMPLE III
As shown in fig. 9, the present embodiment has substantially the same structure as the second embodiment, wherein the same reference numerals are used for the same components, except that: the three recessed surface portions 112 are each formed as a curved surface.
Example four
As shown in fig. 10, the present embodiment has substantially the same structure as the second embodiment, wherein the same reference numerals are used for the same components, except that: one of the three recessed surface portions 112 is formed as a flat surface, and the other two are formed as curved surfaces.
The motor 100 according to an embodiment of the present invention is described in detail in a specific embodiment with reference to fig. 11 to 12. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
Example one
In the present embodiment, as shown in fig. 11 and 12, the motor 100 includes a housing, a motor shaft 1, two bearings 2, a rotor 3, and a stator 8. Wherein, the motor shaft 1 is the motor shaft 1 shown in fig. 1-6.
Specifically, the housing comprises a first housing 91 and a second housing 92, the first housing 91 and the second housing 92 are connected in a buckling manner along the axial direction of the motor rotating shaft 1, the motor rotating shaft 1 penetrates through the housing, the belt pulley mounting position 12 on the motor rotating shaft 1 extends out of the housing, and two bearings 2 are respectively arranged on the first housing 91 and the second housing 92 to support the motor rotating shaft 1; the rotor 3 is installed in rotor installation position 13, and stator 8 cover establish with rotor 3 outside in order to cooperate with rotor 3.
According to the motor 100 of the embodiment of the invention, by adopting the motor rotating shaft 1, the operation noise of the motor 100 is effectively reduced, and the sound quality of the motor 100 is improved.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "length," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the figures, merely to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a motor shaft, its characterized in that, motor shaft is last to have the bearing installation position that is used for the cover to establish the bearing, the outer peripheral face of bearing installation position is including cooperation face and sunken face, cooperation face is at least three and every cooperation face all is located same face of cylinder, every adjacent two be equipped with at least one between the cooperation face sunken face, every sunken face all is located the inboard of face of cylinder.
2. The motor shaft according to claim 1, wherein the number of the fitting surface portions and the number of the recessed surface portions are the same and the fitting surface portions and the recessed surface portions are alternately arranged so that one recessed surface portion is provided between every two adjacent fitting surface portions.
3. The motor shaft according to claim 1, wherein the length of the fitting surface portion is equal to the length of the bearing mounting portion or/and the length of the recessed surface portion is equal to the length of the bearing mounting portion in the axial direction of the motor shaft.
4. The motor shaft as claimed in claim 1, wherein the recessed surface portion is a flat surface, a curved surface, or a combination of a flat surface and a curved surface.
5. The motor shaft as claimed in claim 1, wherein each of the fitting surface portions has a central angle a1Are all equal.
6. The motor shaft according to claim 1, wherein an angle a between each two adjacent fitting surface portions2Are all equal.
7. The motor shaft as claimed in claim 1, wherein each of the fitting surface portions has a central angle a1Are all equal, and the included angle a between every two adjacent matching surface parts2Are all equal to each other, and a1＝a2。
8. The motor rotating shaft according to claim 1, wherein the motor rotating shaft has a belt pulley mounting position for sleeving a belt pulley.
9. A motor shaft according to any one of claims 1 to 8, wherein the bearing mounting locations are plural, and the plural bearing mounting locations are spaced apart in a length direction of the motor shaft.
10. An electric machine, comprising:
a motor shaft according to any one of claims 1-9; and
the bearing sleeve is arranged on the bearing installation position, the matching surface is in interference fit with the bearing, and the sunken surface is in clearance fit with the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910114054.3A CN111564926A (en) | 2019-02-14 | 2019-02-14 | Motor rotating shaft and motor with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910114054.3A CN111564926A (en) | 2019-02-14 | 2019-02-14 | Motor rotating shaft and motor with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111564926A true CN111564926A (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910114054.3A Pending CN111564926A (en) | 2019-02-14 | 2019-02-14 | Motor rotating shaft and motor with same |
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| Country | Link |
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| CN (1) | CN111564926A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0925935A (en) * | 1995-07-14 | 1997-01-28 | Ntn Corp | Sintered oil containing bearing and manufacture thereof |
| JP2007116887A (en) * | 2005-09-21 | 2007-05-10 | Pooraito Kk | Shaft for motor |
| US20080037918A1 (en) * | 2004-01-14 | 2008-02-14 | Yukitaka Hayakawa | Hydrodynamic Bearing Device |
| CN101255892A (en) * | 2001-11-13 | 2008-09-03 | Ntn株式会社 | Fluid lubricated bearing device |
| CN101294601A (en) * | 2007-04-25 | 2008-10-29 | 富准精密工业(深圳)有限公司 | Hydrodynamic bearing structure and cooling fan using the same |
| CN105134642A (en) * | 2015-08-24 | 2015-12-09 | 联想(北京)有限公司 | Bearing, fan and rotating device |
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2019
- 2019-02-14 CN CN201910114054.3A patent/CN111564926A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0925935A (en) * | 1995-07-14 | 1997-01-28 | Ntn Corp | Sintered oil containing bearing and manufacture thereof |
| CN101255892A (en) * | 2001-11-13 | 2008-09-03 | Ntn株式会社 | Fluid lubricated bearing device |
| US20080037918A1 (en) * | 2004-01-14 | 2008-02-14 | Yukitaka Hayakawa | Hydrodynamic Bearing Device |
| JP2007116887A (en) * | 2005-09-21 | 2007-05-10 | Pooraito Kk | Shaft for motor |
| CN101294601A (en) * | 2007-04-25 | 2008-10-29 | 富准精密工业(深圳)有限公司 | Hydrodynamic bearing structure and cooling fan using the same |
| CN105134642A (en) * | 2015-08-24 | 2015-12-09 | 联想(北京)有限公司 | Bearing, fan and rotating device |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200821 |
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| RJ01 | Rejection of invention patent application after publication |