CN116979741A - Motor bearing inner cover and motor - Google Patents
Motor bearing inner cover and motor Download PDFInfo
- Publication number
- CN116979741A CN116979741A CN202310444248.6A CN202310444248A CN116979741A CN 116979741 A CN116979741 A CN 116979741A CN 202310444248 A CN202310444248 A CN 202310444248A CN 116979741 A CN116979741 A CN 116979741A
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- China
- Prior art keywords
- boss
- bearing inner
- disk body
- inner cover
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000005381 potential energy Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention relates to a motor bearing inner cover and a motor, wherein the bearing inner cover comprises a disk body, a through hole is formed in the middle of the disk body, a plurality of bolt holes are formed in the edge of the disk body along the circumferential direction, an annular boss is arranged on one side of the disk body along the outer circumference of the through hole, the outer surface of the boss is parallel to the outer surface of the same side of the disk body, the outer surface of the boss protrudes out of the outer surface of the same side of the disk body, one end, close to the through hole, of the boss is connected with the disk body into a whole, and one end, far away from the through hole, of the boss is suspended and an open groove is formed between the boss and the outer surface of the same side of the disk body. The bearing inner cover designed by the invention can ensure that the bearing inner cover is always in surface contact with the bearing after the bolt pretightening force is applied, so that the problem of stress concentration in the prior art is avoided, the service life of materials is effectively prolonged, and the reliability of the motor is improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor bearing inner cover and a motor.
Background
The inside bearing inner cup of motor is used for fixed bearing, in order to avoid the bearing to take place axial rocking, and one side of bearing inner cup orientation bearing is equipped with the boss generally, makes the surface of boss closely laminate with the bearing during the installation, passes through bolt and casing fixed connection at the edge of bearing inner cup. Because the boss surface on the current bearing inner cover is parallel with the faying surface of bearing each other, when the bolt of fixed bearing inner cover does not exert the pretightning force, the boss surface of bearing inner cover is the face contact with the bearing contact surface this moment, and after the pretightning force was exerted to the bolt on the bearing inner cover, the boss surface of bearing inner cover changes into the line contact with the bearing, can lead to the line contact region to take place stress concentration phenomenon from this, takes place the risk of material inefficacy easily.
Disclosure of Invention
The invention improves the structure of the prior bearing inner cover, and the following designs of two different structures are provided, so that the problem of stress concentration in the contact area between the bearing inner cover and the bearing after the bolt pretightening force is applied is avoided.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the motor bearing inner cover comprises a disc body, wherein a through hole is formed in the middle of the disc body, a plurality of bolt holes are formed in the edge of the disc body along the circumferential direction, an annular boss is arranged on one side of the disc body along the outer circumference of the through hole, the outer surface of the boss is parallel to the outer surface of the same side of the disc body, and the outer surface of the boss protrudes out of the outer surface of the same side of the disc body; one end of the boss, which is close to the through hole, is connected with the tray body into a whole, and an open groove is formed between the boss, which is far away from the through hole, and the outer surface of the same side of the tray body.
Further, the depth dimension of the open groove is set as A, the contact width dimension of the surface where the bearing attaching boss is located is set as D, and A is 40% -60% of D.
Further, a is 50% of D.
Further, the height dimension of the boss is set as C, the width dimension of the open groove is set as B, and B is 25% -50% of C.
Further, C is more than or equal to 4mm.
Further, the B is 1mm to 5mm.
The invention also discloses a motor, which comprises a shell, a bearing and the bearing inner cover, wherein the outer surface of the boss of the bearing inner cover is attached to the bearing, and the bearing inner cover is fixedly connected with the shell through bolts.
The utility model provides a motor bearing inner cup, includes the disk body, and the through-hole is seted up at the middle part of disk body, and a plurality of bolt holes are seted up along circumferencial direction to the edge of disk body, and one side of disk body sets up annular boss along the outer circumference of through-hole, and the surface of boss exceeds in the surface of disk body homonymy, and the surface of boss inclines for the surface of disk body homonymy, and the incline direction is towards the edge direction of disk body.
The invention also discloses a motor, which comprises a shell, a bearing and the bearing inner cover with the inclined-plane boss, wherein the boss inclined plane of the bearing inner cover is attached to the bearing, and the bearing inner cover is fixedly connected with the shell through a bolt.
The bearing inner cover designed by the invention can ensure that the bearing inner cover is always in surface contact with the bearing after the bolt pretightening force is applied, so that the problem of stress concentration in the prior art is avoided, the service life of materials is effectively prolonged, and the reliability of the motor is improved.
Drawings
Fig. 1 is a schematic view showing a structure in which an inner bearing cover faces an outside of a motor in a first embodiment;
fig. 2 is a schematic view showing a structure of the bearing inner cover facing the inside of the motor in the first embodiment;
FIG. 3 is a longitudinal cross-sectional view of an inner bearing cover according to a first embodiment;
FIG. 4 is an enlarged partial view of the cross-sectional view of FIG. 3;
FIG. 5 is a schematic view showing a partial assembly of the bearing inner cover on the motor according to the first embodiment;
FIG. 6 is a diagram showing the design dimensions of the bearing inner cover and the bearing in the attached state according to the first embodiment;
fig. 7 is a longitudinal partial sectional view of the bearing inner cover in the second embodiment.
Reference numerals illustrate:
1. a tray body; 2. a boss; 3. bolt holes; 4. an open groove; 5. a bearing inner cover; 6. a bearing; 7. a housing; 8. a bolt; 9. inclined boss.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1, 2 and 5, an inner cover of a motor bearing in the prior art comprises a disc body 1, a through hole for a rotating shaft to pass through is formed in the middle of the disc body 1, a plurality of bolt holes 3 are formed in a circle of edge of the disc body 1 along the circumferential direction, an annular boss 2 protruding out of the outer surface of the same side of the disc body 1 is arranged on one side of the disc body 1, and the boss 2 is arranged along the outer circumference of the through hole. The side provided with the boss 2 is the side where the inner cover of the bearing is attached to the bearing 6, and the outer surface of the boss 2 is usually attached to the bearing in the prior art, so that the outer surface of the boss on the inner cover of the bearing in the prior art is parallel to the outer surface of the same side of the disc body 1. Because the bearing inner cover needs to be fixedly connected with the shell 7 through the bolt 8, once the pretightening force is applied to the bolt 8, the boss 2 of the bearing inner cover presses the side face of the bearing 6, and the contact face of the boss 2 of the bearing inner cover generates inclined deformation under the reaction force, so that the original bearing inner cover and the bearing 6 are changed into a line contact form from surface contact, the stress concentration of the area where the boss 2 of the bearing inner cover is in line contact is concentrated, and the material failure is easy to be caused after long-term use, thereby influencing the reliability of a motor.
The present embodiment is designed to solve the above-mentioned problems by improving the structure of the inner cover of the existing bearing, and two structural improvements are given below.
Embodiment one: in this embodiment, an open groove 4 is formed on the boss 2 of the bearing inner cover, as shown in fig. 3 and 3, one end of the boss 2 close to the through hole is connected with the disc body 1 into a whole, one end of the boss 2 far away from the through hole is suspended, a gap is left between the suspended end and the outer surface of the same side of the disc body 1, and the open groove 4 is formed at the gap. Due to the existence of the open groove 4, after the bolt pretightening force is applied, the suspended end of the boss 2 of the bearing inner cover deforms to store elastic potential energy, and the boss 2 is extruded to one side of the bearing 6 under the action of the elastic potential energy, so that the boss 2 and the side surface of the bearing 6 always keep in a surface contact mode, and the problem of stress concentration is avoided. In addition, in the long-term use process of the motor, the bolt is easy to fatigue and creep loosening, and particularly, once the bolt 8 for fixing the inner cover of the bearing is loosened, the axial shaking amount of the bearing 6 is increased, so that the service life of the motor is reduced. In this embodiment, the elastic potential energy is reserved due to the open groove 4, so that the bearing inner cover releases the elastic potential energy even if the bolt 8 is slightly loosened, and the bearing 6 is always kept in a fixed state, so that the reliability of the motor is improved.
Specifically, in designing the relevant dimensions of the open groove 4, referring to the dimension labeling illustration given in fig. 6, let the depth dimension of the open groove 4 be a, let the contact width dimension of the face where the bearing 6 is attached to the boss 2 be D, let the height dimension of the boss 2 be C, and let the width dimension of the open groove 4 be B. The dimension A is preferably 40 to 60% of the dimension D, and preferably A is 50% of the dimension D. If the dimension A is too deep, although the fit degree with the matched pair is better, the suspended end of the boss 2 is stressed too much to generate permanent deformation, and the resilience capacity is lost; if dimension a is too shallow, the ability to conform to the mating pair by deformation is lost. Regarding the design of the dimension B, considering the processing capability, the dimension B is preferably 25% -50% of the dimension C, and particularly, regarding the condition that the height dimension C of the boss 2 is more than or equal to 4mm, the dimension B is preferably 1-5 mm.
With the bearing inner cover according to the first embodiment, as shown in fig. 5, fig. 5 is a simplified diagram of partial assembly, in which the rotating shaft is omitted, only half of the structures of the bearing inner cover 5, the bearing 6 and the housing 7 located at the upper part of the rotating shaft are shown, the outer surface of the boss 2 of the bearing inner cover 5 is attached to the side surface of the bearing 6, and the bearing inner cover 5 is fixedly connected with the housing 7 after a pre-tightening force is applied to the bearing inner cover through the bolt 8.
Embodiment two: as shown in fig. 7, the bearing inner cover in this embodiment is a bevel boss 9, and the outer surface of the bevel boss 9 is not parallel to the outer surface of the same side of the disc body 1, but has a certain inclination with respect to the outer surface of the same side of the disc body 1, and the inclination direction is toward the edge direction of the disc body 1, i.e. one end of the bevel boss 9 close to the through hole is higher than one end far from the through hole. The plane of the outer surface of the inclined boss 9 presents an inclined angle a with the plane of the outer surface of the same side of the disc body 1, the inclined angle a mainly considers factors such as the thickness of the disc body 1, the pre-tightening force applied by the bolt 8, the specific structure of the bearing inner cover and the like, and the deformation of the bearing inner cover in a locked state can be calculated by means of finite elements, so that the inclination angle to be processed is determined. By adopting the design scheme of the inclined boss 9 provided by the embodiment, the stress concentration of the bolt 8 after the pretightening force is applied can be avoided, and when the pretightening force is not applied, the outer surface of the inclined boss 9 is in line contact with the side surface of the bearing 6, but the inclined boss is changed into surface contact once the pretightening force is applied, and the situation is just opposite to the situation of the bearing inner cover in the prior art.
The motor assembly is performed by using the bearing inner cover provided in the second embodiment, the inclined surface of the inclined surface boss 9 of the bearing inner cover is attached to the bearing 6, and the bearing inner cover is fixedly connected with the housing 7 through the bolt 8.
Although the bearing inner cover with two different structures is provided, the solution of the second embodiment has higher requirements on the processing precision of the inclination angle of the inclined boss 9, and the bearing inner cover in the second embodiment also has no elastic potential energy storage capability, and once the bolt 8 loosens, the bearing inner cover cannot fully fix the bearing 6. The scheme provided by the first embodiment can reduce the machining precision requirement of the contact surface of the boss 2 of the bearing inner cover, can completely use the deformation of the suspended end of the boss 2 to make up the defect of the machining precision, and can tightly press the bearing inner cover to the bearing 6 by releasing elastic potential energy under the condition that the bolt 8 is slightly loosened, thereby avoiding the bearing 6 from shaking axially.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a motor bearing inner cup which characterized in that: including the disk body, the through-hole is seted up at the middle part of disk body, and a plurality of bolt holes are seted up along the circumferencial direction to the edge of disk body, and the one side of disk body sets up annular boss along the outer circumference of through-hole, and the surface of boss is parallel with the surface of disk body homonymy, and the surface of boss salient in the surface of disk body homonymy, and the one end that the boss is close to the through-hole links as an organic wholely with the disk body, and the boss is kept away from the unsettled and forms open recess with between the surface of disk body homonymy of one end of through-hole.
2. A motor bearing inner cap according to claim 1, wherein: the depth dimension of the open groove is set as A, the contact width dimension of the surface where the bearing joint boss is located is set as D, and the A is 40% -60% of the D.
3. A motor bearing inner cap according to claim 2, wherein: the A is 50% of the D.
4. A motor bearing inner cap according to claim 1, wherein: the height dimension of the boss is C, the width dimension of the open groove is B, and B is 25% -50% of C.
5. The motor bearing inner cap of claim 4, wherein: the C is more than or equal to 4mm.
6. The motor bearing inner cap of claim 4, wherein: the length of the B is 1 mm-5 mm.
7. An electric motor, characterized in that: the bearing inner cover comprises a shell, a bearing and the bearing inner cover according to any one of claims 1-6, wherein the outer surface of a boss of the bearing inner cover is attached to the bearing, and the bearing inner cover is fixedly connected with the shell through bolts.
8. The utility model provides a motor bearing inner cup which characterized in that: including the disk body, the through-hole is seted up at the middle part of disk body, and a plurality of bolt holes are seted up along the circumferencial direction to the edge of disk body, and one side of disk body sets up annular boss along the outer circumference of through-hole, and the surface of boss stands proud of the surface of disk body homonymy, and the surface of boss inclines for the surface of disk body homonymy, and the incline direction is towards the edge direction of disk body.
9. An electric motor, characterized in that: the bearing inner cover comprises a shell, a bearing and the bearing inner cover as claimed in claim 8, wherein the boss inclined surface of the bearing inner cover is attached to the bearing, and the bearing inner cover is fixedly connected with the shell through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310444248.6A CN116979741A (en) | 2023-04-24 | 2023-04-24 | Motor bearing inner cover and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310444248.6A CN116979741A (en) | 2023-04-24 | 2023-04-24 | Motor bearing inner cover and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116979741A true CN116979741A (en) | 2023-10-31 |
Family
ID=88478495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310444248.6A Pending CN116979741A (en) | 2023-04-24 | 2023-04-24 | Motor bearing inner cover and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116979741A (en) |
-
2023
- 2023-04-24 CN CN202310444248.6A patent/CN116979741A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xu Pengshuai Inventor after: Fu Wenlong Inventor after: Feng Chaojie Inventor after: Liu Wei Inventor after: Zhou Lixin Inventor after: Fan Guowei Inventor before: Xu Pengshuai Inventor before: Fu Wenlong Inventor before: Feng Chaojie Inventor before: Liu Wei Inventor before: Zhou Lixin |
|
| CB03 | Change of inventor or designer information | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |