CN113431843A

CN113431843A - Bearing structure and motor

Info

Publication number: CN113431843A
Application number: CN202110791167.4A
Authority: CN
Inventors: 苏向鑫; 余俊宏; 师少平; 伍光祥; 漆凌君
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2021-09-24
Anticipated expiration: 2041-07-13
Also published as: CN113431843B

Abstract

The application provides a bearing structure and a motor. The bearing structure comprises a bearing outer ring (1), a bearing inner ring (2), a rolling body (3) and a conductive structure, wherein the bearing outer ring (1) is sleeved outside the bearing inner ring (2), the rolling body (3) rolls in a roller path formed by the bearing outer ring (1) and the bearing inner ring (2), and the conductive structure is arranged between the bearing outer ring (1) and the bearing inner ring (2) and is in conductive connection with the bearing inner ring (2) and the bearing outer ring (1). According to the bearing structure, the potential difference of the inner ring and the outer ring of the bearing can be effectively eliminated, and the electric corrosion prevention capability of the bearing is ensured.

Description

Bearing structure and motor

Technical Field

The application relates to the technical field of bearings, in particular to a bearing structure and a motor.

Background

When the motor rotating shaft runs in the motor with an alternating magnetic field, electromotive force is formed on the rotating shaft. The electromotive force on the rotating shaft needs to form a loop through the conductor, and the motor bearing plays the role of the conductor in the loop.

When the motor rotating shaft runs, because lubricating oil needs to be used in the motor bearing, insulating oil films can be generated among the bearing inner ring, the bearing outer ring and the rolling body, and the charge on the motor rotating shaft is accumulated. Sufficient charge accumulation enables a large enough potential difference to be formed between an inner ring and an outer ring of the motor bearing, the large enough potential difference induces spark discharge between the roller path and the rolling body to break down an insulating oil film, the oil film is burnt, local melting and concave-convex are formed on the surface of the roller path, wavy abrasion is formed, and finally the service life of the bearing is shortened.

The prior art discloses a bearing for preventing electric corrosion, which comprises a bearing body, a bearing seat and an insulated annular bushing, wherein a bearing chamber for accommodating the annular bushing is arranged in the bearing seat, and the annular bushing is positioned in the bearing chamber and is tightly connected with the bearing seat; the bearing body is positioned in the annular bushing and is in tight fit connection with the annular bushing. The annular bush is inlayed in the bearing chamber through die-casting or the mode of interference connection, even as an organic whole with the bearing chamber, and the bearing body is installed in the annular bush, and from this, insulating annular bush ring is around the outer a week of bearing, has completely cut off the contact of bearing with the bearing frame to form the electric current and open circuit, thoroughly solved bearing galvanic corrosion, effectively prolonged bearing life, and structure and preparation simple process easily large-scale production and application.

However, although the bearing structure can insulate the bearing from the bearing chamber, when the shaft voltage is continuously accumulated to be far higher than the maximum voltage which can be borne by the bearing, the bearing capacitance is broken down, and the shaft current still forms current through the bearing balls, namely the current between the inner ring and the outer ring to cause bearing corrosion, so that the problem of bearing electrical corrosion is not solved substantially.

Disclosure of Invention

Therefore, the technical problem to be solved by the application is to provide a bearing structure and a motor, which can effectively eliminate the potential difference between the inner ring and the outer ring of the bearing and ensure the electric corrosion prevention capability of the bearing.

In order to solve the above problem, the present application provides a bearing structure, including bearing inner race, rolling element and conducting structure, the bearing inner race cover is established outside the bearing inner race, and the rolling element rolls in the raceway that bearing inner race and bearing outer race formed, and conducting structure sets up between bearing inner race and bearing outer race to form the conductive connection to bearing inner race and bearing outer race.

Preferably, the conductive structure can move along the radial direction relative to the bearing inner ring and the bearing outer ring, and the conductive structure can receive a driving force for driving the conductive structure to move towards the bearing outer ring when the bearing inner ring rotates, so that the conductive structure can be used for electrically connecting the bearing inner ring and the bearing outer ring all the time.

Preferably, the periphery of the bearing inner ring is provided with a mounting seat, the mounting seat comprises a guide structure, and the conductive structure is arranged on the mounting seat and can move along the guide of the guide structure.

Preferably, the mount pad still includes the lug, and the lug is connected on the bearing inner race, and guide structure sets up on the lug, and electrically conductive structure passes through guide structure and can set up on the lug with sliding, and guide structure forms the direction spacing to electrically conductive structure.

Preferably, the cross section of the guide structure is T-shaped, the bottom edge of the guide structure is connected to the projection, the guide structure extends along the radial direction of the bearing inner ring, the conductive structure is a conductive sheet, a guide groove is formed in the conductive sheet, the radial length of the guide groove is larger than that of the guide structure, the guide groove is in clearance fit with the bottom edge, and when the bearing inner ring rotates, the conductive sheet can be in conductive contact with the bearing outer ring under the action of centrifugal force.

Preferably, the outer circumference of the bearing inner ring is provided with a conductive groove, and part of the conductive sheet is positioned in the conductive groove.

Preferably, the mount pad includes the lug, and guide structure is including setting up the sliding tray on the lug, and electrically conductive structure includes elastic component and thimble, and the thimble can set up in the sliding tray with sliding, and the elastic component setting is between thimble and sliding tray to with the bottom butt of thimble and sliding tray, the other end butt of thimble is on the bearing outer race.

Preferably, the sliding groove is provided with a sliding limiting part at the opening, and the thimble is provided with a stop flange which forms limiting fit with the sliding limiting part.

Preferably, the number of the conductive structures is multiple, and the multiple conductive structures are uniformly distributed along the circumferential direction of the bearing inner ring.

According to another aspect of the present application, there is provided an electric machine comprising a bearing structure as described above.

The application provides a bearing structure, including bearing inner race, rolling element and conducting structure, the bearing inner race cover is established outside the bearing inner race, and the rolling element rolls in the raceway that bearing inner race and bearing inner race formed, and conducting structure sets up between bearing inner race and bearing inner race to form the electrically conductive connection to bearing inner race and bearing outer race. This bearing structure is direct to be connected through electrically conductive structure with electrically conductive between bearing inner race and the bearing outer race, can be so that bearing inner race and bearing outer race be in the connected state constantly, can guarantee constantly that bearing inner race and bearing outer race electric potential equal, through this kind of connected mode, the electric current will not circulate through the bearing ball to can furthest reach the purpose of preventing the galvanic corrosion, consequently can effectively eliminate the bearing inner race potential difference, guarantee that the bearing prevents the galvanic corrosion ability.

Drawings

FIG. 1 is an exploded view of a bearing structure according to an embodiment of the present application;

FIG. 2 is a cross-sectional structural view of a bearing structure of an embodiment of the present application;

FIG. 3 is a perspective view of a bearing inner race of a bearing structure according to an embodiment of the present application;

FIG. 4 is an exploded view of a bearing structure according to an embodiment of the present application;

FIG. 5 is a schematic structural view of a bearing structure according to an embodiment of the present application;

fig. 6 is a sectional structural view of a bearing structure according to an embodiment of the present application.

The reference numerals are represented as:

1. a bearing outer race; 2. a bearing inner race; 3. a rolling body; 4. a mounting seat; 5. a guide structure; 6. a bump; 7. a conductive sheet; 8. a guide groove; 9. a conductive slot; 10. a sliding groove; 11. an elastic member; 12. a thimble; 13. a slide limit part; 14. a stop flange; 15. a dust cover; 16. a cage.

Detailed Description

Referring to fig. 1 to 6 in combination, according to an embodiment of the present application, a bearing structure includes a bearing outer ring 1, a bearing inner ring 2, a rolling element 3, and a conductive structure, where the bearing outer ring 1 is sleeved outside the bearing inner ring 2, the rolling element 3 rolls in a raceway formed by the bearing outer ring 1 and the bearing inner ring 2, and the conductive structure is disposed between the bearing outer ring 1 and the bearing inner ring 2 and forms a conductive connection between the bearing inner ring 2 and the bearing outer ring 1.

This bearing structure is direct to be connected with electrically conductive between bearing inner race 2 and the bearing outer race 1 through electrically conductive structure, can make bearing inner race 2 and bearing outer race 1 be in the connected state constantly, can guarantee constantly that bearing inner race 2 and bearing outer race 1 electric potential equal, through this kind of connected mode, the electric current will not circulate through the bearing ball to can furthest reach the mesh of preventing the galvanic corrosion, consequently can effectively eliminate the bearing inner and outer lane potential difference, guarantee that the bearing prevents the galvanic corrosion ability.

Bearing structure still includes holder 16 and shield 15, bearing inner race 1 and bearing housing hole adaptation are motionless, bearing inner race 2 is fixed epaxial, and rotate along with the axle, rolling element 3 rolls in the inner and outer lane raceway, holder 16 evenly separates rolling element 3 along bearing inner race 2's circumference, make rolling element 3 can follow circumference evenly distributed, shield 15 branch establishes at bearing inner race 1's both ends, can shelter from bearing inner race 1 and bearing inner race 2 between the raceway formation, prevent that foreign matter from entering into in the raceway, influence the service environment in the raceway, reduce the life of raceway and rolling element 3.

In one embodiment, the conductive structure is capable of moving in a radial direction relative to the bearing inner ring 2 and the bearing outer ring 1, and the conductive structure is capable of receiving a driving force for driving the conductive structure to move towards the bearing outer ring 1 when the bearing inner ring 2 rotates, so that the conductive structure is always conductively connected with the bearing inner ring 2 and the bearing outer ring 1.

In this embodiment, the conductive structure can move along the radial direction relative to the bearing inner ring 2 and the bearing outer ring 1, and can be connected with the bearing inner ring 2 and the bearing outer ring 1 all the time under the action of the driving force, so that the wear loss of the conductive structure can be automatically compensated under the action of the driving force, the conductive connection between the bearing inner ring 2 and the bearing outer ring 1 can be realized all the time by the conductive structure, and the anti-galvanic corrosion capability is effective for a long time.

Preferably, the conductive structure is in point contact with the bearing outer ring 1, so that the abrasion between the conductive structure and the bearing outer ring 1 can be reduced to the minimum, and the service life of the bearing structure is longer.

The bearing with the electrocorrosion preventing structure is suitable for various motors only by replacing the bearing in the related technology, and is good in universality; meanwhile, various procedures (such as sticking a conductive adhesive tape and installing various conductive pieces on the motor body) in the production process of the motor can be reduced, a series of uncertain factors caused by installing other conductive pieces on the motor body can be avoided, the production reject ratio is greatly reduced, the production efficiency and the quality are greatly improved, and the market competitiveness is improved.

In one embodiment, the outer circumference of the bearing inner ring 2 is provided with a mounting seat 4, the mounting seat 4 comprises a guide structure 5, and the conductive structure is arranged on the mounting seat 4 and can move along the guide of the guide structure 5. The guide structure 5 can guide the motion of the conductive structure, can ensure the accuracy of the motion direction of the conductive structure, can also ensure the effective contact of the conductive structure with the bearing inner ring 2 and the bearing outer ring 1, and can ensure that the bearing inner ring 2 and the bearing outer ring 1 can be always kept conductive.

In one embodiment, the mounting seat 4 further includes a bump 6, the bump 6 is connected to the bearing inner ring 2, the guiding structure 5 is disposed on the bump 6, the conductive structure is slidably disposed on the bump 6 through the guiding structure 5, and the guiding structure 5 forms a guiding limit for the conductive structure. In this embodiment, the mounting seat 4 can play the role of installing the conductive structure, and can play the role of guiding the motion of the conductive structure, so that the conductive structure can move along the radial direction all the time, smoothly reach the inner peripheral wall of the bearing outer ring 1, and realize conductive contact with the bearing outer ring 1.

In one embodiment, the cross section of the guide structure 5 is T-shaped, the bottom edge of the guide structure 5 is connected to the bump 6, the guide structure 5 extends along the radial direction of the bearing inner ring 2, the conductive structure is a conductive sheet 7, a guide groove 8 is arranged on the conductive sheet 7, the radial length of the guide groove 8 is greater than that of the guide structure 5, the guide groove 8 is in clearance fit with the bottom edge, and when the bearing inner ring 2 rotates, the conductive sheet 7 can be in conductive contact with the bearing outer ring 1 under the action of centrifugal force.

In this embodiment, the bottom edge of the guiding structure 5 is connected to the bump 6, and the top edge is parallel to the connecting surface of the bump 6, so that a limiting effect can be formed on the conductive sheet 7 located between the top edge and the bump 6, the conductive sheet 7 is prevented from sliding off from the guiding structure 5, and the stability and reliability of the conductive structure on the bump 6 are ensured.

The conducting strip 7 forms clearance fit with the bottom edge through the guide groove 8, and the radial extension structure of the bottom edge limits the sliding of the conducting strip 7, so that the conducting strip 7 can slide along the radial direction, more effectively reach the inner periphery of the bearing outer ring 1, and form conductive contact with the bearing outer ring 1. The radial length of the guide groove 8 is greater than that of the guide structure 5, so that the conducting strip 7 can be ensured to have enough movement space, and can still form effective contact with the bearing outer ring 1 under the condition of abrasion.

In one embodiment, the outer circumference of the bearing inner ring 2 is provided with the conductive groove 9, a part of the conductive sheet 7 is located in the conductive groove 9, the conductive groove 9 is mainly used for limiting the movement range of the conductive sheet 7, and ensuring that the conductive sheet 7 has enough movement space in the radial direction, and further ensuring that the conductive sheet 7 has enough contact area with the bearing inner ring 2, thereby forming good conductive performance.

When the motor works, the current generated by the rotating shaft is transmitted to the bearing inner ring 2, and the current of the bearing inner ring 2 can be directly transmitted to the bearing outer ring 1 and the end cover through the conducting strip 7, so that the potential balance of the inner ring and the outer ring can be balanced, the shaft voltage between the inner ring and the outer ring of the bearing can not be generated, the current can not be generated between the rolling body 3 and the inner ring and the outer ring of the bearing, and the service life and the performance of the bearing are greatly prolonged. The rolling elements 3 are balls, for example.

In one embodiment, the mounting seat 4 includes a protrusion 6, the guiding structure 5 includes a sliding groove 10 disposed on the protrusion 6, the conductive structure includes an elastic element 11 and a thimble 12, the thimble 12 is slidably disposed in the sliding groove 10, the elastic element 11 is disposed between the thimble 12 and the sliding groove 10 and abuts against the bottom of the thimble 12 and the sliding groove 10, and the other end of the thimble 12 abuts against the bearing outer ring 1.

In the present embodiment, the bearing outer ring 1 is electrically connected to the bearing inner ring 2 through the elastic element 11 and the ejector pin 12, and in the motor operating state, the rotating shaft and the bearing inner ring 2, the elastic element 11, the ejector pin 12, the bearing outer ring 1 and the end cover will also be in an electrically connected state.

In one embodiment, the sliding groove 10 is provided with a sliding limiting portion 13 at the opening, and the thimble 12 is provided with a stop flange 14 forming a limiting fit with the sliding limiting portion 13. In this embodiment, a baffle is disposed at an opening of the sliding groove 10, an opening through which the thimble 12 passes is formed in the baffle, and the diameter of the opening is smaller than that of the stopping flange 14, so that the stopping flange 14 can be limited by the baffle, the thimble 12 is effectively prevented from popping out of the sliding groove 10 under the action of the elastic element 11, and the structural stability and reliability of the elastic assembly formed by the elastic element 11 and the thimble 12 are improved. The baffle can be fixedly connected with the lug 6 through bolts, and can also be directly welded at the opening of the sliding groove 10 of the lug 6.

In one embodiment, the conductive structure is a plurality of conductive structures, and the plurality of conductive structures are uniformly arranged along the circumferential direction of the bearing inner ring 2.

The bearing structure can automatically adjust the positions of the conducting strips and the thimble to compensate the abrasion loss under the action of centrifugal force or spring elasticity, electrically connect the inner ring and the outer ring of the bearing constantly, conduct the inner ring and the outer ring of the bearing through the conducting structure, further electrically connecting the rotating shaft, the inner ring and the outer ring of the bearing and the end cover, ensuring the potential balance of the inner ring and the outer ring of the bearing, thereby avoiding the generation of shaft voltage between the inner ring and the outer ring of the bearing, and the electric corrosion of the bearing is caused by that the shaft voltage generated between the inner ring and the outer ring of the bearing is larger than the maximum voltage which can be borne by the bearing capacitor, the bearing capacitor is broken down, and simultaneously the shaft current breakdown path is finer, therefore, a large current is generated at the breakdown point, the bearing structure avoids the generation of large current density at the breakdown point, and large amount of heat generated by instant release of the current is avoided, so that pits and corrosion caused by melting of the breakdown point of the ball and the surface of the raceway are avoided. Compared with the structure for preventing the electric corrosion in the bearing in the related technology, the structure has longer service life and better noise.

According to an embodiment of the application, the motor comprises a bearing structure, which is the bearing structure described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The utility model provides a bearing structure, its characterized in that, includes bearing inner race (1), bearing inner race (2), rolling element (3) and conductive structure, bearing inner race (1) cover is established outside bearing inner race (2), rolling element (3) are in bearing inner race (1) with roll in the raceway that bearing inner race (2) formed, conductive structure sets up bearing inner race (1) with between bearing inner race (2), and it is right bearing inner race (2) with bearing inner race (1) forms the conductive connection.

2. The bearing arrangement according to claim 1, characterized in that the electrically conductive structure is movable in radial direction with respect to the inner bearing ring (2) and the outer bearing ring (1), the electrically conductive structure being subject to a driving force for driving the electrically conductive structure to the outer bearing ring (1) when the inner bearing ring (2) rotates, such that the electrically conductive structure is always conductively connecting the inner bearing ring (2) and the outer bearing ring (1).

3. A bearing arrangement according to claim 2, characterized in that the outer circumference of the bearing inner ring (2) is provided with a mounting seat (4), the mounting seat (4) comprising a guiding structure (5), the electrically conductive structure being arranged on the mounting seat (4) and being movable in the direction of the guiding structure (5).

4. A bearing arrangement according to claim 3, characterized in that the mounting seat (4) further comprises a projection (6), the projection (6) being connected to the inner bearing ring (2), the guiding structure (5) being arranged on the projection (6), the conducting structure being slidably arranged on the projection (6) via the guiding structure (5), the guiding structure (5) forming a guiding stop for the conducting structure.

5. The bearing structure of claim 4, wherein the cross section of the guide structure (5) is T-shaped, the bottom edge of the guide structure (5) is connected to the bump (6), the guide structure (5) extends along the radial direction of the bearing inner ring (2), the conductive structure is a conductive sheet (7), a guide groove (8) is arranged on the conductive sheet (7), the radial length of the guide groove (8) is greater than that of the guide structure (5), the guide groove (8) is in clearance fit with the bottom edge, and when the bearing inner ring (2) rotates, the conductive sheet (7) can be in conductive contact with the bearing outer ring (1) under the action of centrifugal force.

6. A bearing arrangement according to claim 5, characterized in that the outer circumference of the bearing inner ring (2) is provided with electrically conductive grooves (9), and that parts of the electrically conductive strips (7) are located in the electrically conductive grooves (9).

7. The bearing structure according to claim 3, wherein the mounting seat (4) comprises a projection (6), the guiding structure (5) comprises a sliding groove (10) provided on the projection (6), the conductive structure comprises an elastic member (11) and an ejector pin (12), the ejector pin (12) is slidably provided in the sliding groove (10), the elastic member (11) is provided between the ejector pin (12) and the sliding groove (10) and abuts against the ejector pin (12) and the bottom of the sliding groove (10), and the other end of the ejector pin (12) abuts against the outer bearing ring (1).

8. The bearing structure according to claim 7, wherein the sliding groove (10) is provided with a sliding limiting part (13) at the opening, and the thimble (12) is provided with a stop flange (14) which forms a limiting fit with the sliding limiting part (13).

9. The bearing arrangement according to any one of claims 1 to 8, characterized in that the electrically conductive structure is plural and is evenly arranged in the circumferential direction of the inner bearing ring (2).

10. An electrical machine comprising a bearing arrangement, characterized in that the bearing arrangement is as claimed in any one of claims 1 to 9.