CN116266724A - Shaft end connecting structure capable of preventing bearing from being electrically corroded and motor - Google Patents
Shaft end connecting structure capable of preventing bearing from being electrically corroded and motor Download PDFInfo
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- CN116266724A CN116266724A CN202111544915.5A CN202111544915A CN116266724A CN 116266724 A CN116266724 A CN 116266724A CN 202111544915 A CN202111544915 A CN 202111544915A CN 116266724 A CN116266724 A CN 116266724A
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Abstract
The invention discloses a shaft end connection structure for preventing bearing electric corrosion and a motor, the structure comprises an end cover, a rotating shaft, a bearing, a conductive connection assembly and a grounding fixing part, wherein the end part of the rotating shaft is provided with an installation shaft extending outwards along an axis, an inner ring of the conductive bearing is fixedly matched with the periphery of the installation shaft, the diameter of the conductive bearing is smaller than that of the bearing, the conductive connection assembly comprises an outer sleeve piece and inner inserts, the outer sleeve piece is arranged on the grounding fixing part, the embedded ends of the inner inserts are positioned in the sleeved ends of the outer sleeve piece, the non-embedded ends are fixedly connected with the outer ring of the conductive bearing, at least two inner inserts are uniformly arranged along the circumferential direction of the conductive bearing, and the embedded ends of the inner inserts are provided with elastic pieces for limiting the elasticity of the inner inserts between the conductive bearing and the sleeved ends. The structure can prevent the bearing from electric corrosion, is little influenced by axial and radial play of the rotor, and has high reliability and convenient disassembly and assembly. The motor of the present invention has the above-mentioned shaft end connection structure and thus also has the above-mentioned advantages.
Description
Technical Field
The invention belongs to the technical field of driving motors, and particularly relates to a shaft end connecting structure for preventing bearing electric corrosion and a motor.
Background
At present, a motor system of a passenger car adopts a PWM frequency conversion system to control the operation of a motor. The common mode voltage in the PWM frequency conversion system acts on the motor winding, a common mode current path is formed through a coupling capacitor in the motor, and the shaft current is a part of the common mode current. The excessive shaft current can cause bearing electric corrosion, and when the bearing voltage between the inner raceway and the outer raceway of the bearing is raised to a certain degree, the bearing voltage exceeds the threshold voltage of a lubricating oil film, and a breakdown discharge phenomenon can be generated. The short-circuit current generated by discharge can generate huge heat in a short time, so that metal near a breakdown point is molten, the running condition of a motor bearing can be poorer and worse, the service life of the bearing is shortened, and the reliable running of the motor can be endangered by long-term shaft current. And as the voltage of the direct current bus increases, the shaft voltage also increases, and the probability of bearing electric corrosion of the motor bearing also increases.
A currently common solution to this problem is to use brushes, through which the shaft current passes without passing through bearings. However, brushes are prone to wear and require periodic replacement, which is difficult. In addition, the insulating bearing is adopted to prevent shaft current from being generated by discharging between the inner ring and the outer ring of the bearing, but the insulating bearing has high cost and is not suitable for popularization. The motor rotor is also provided with a conductive small bearing and a conductive elastic sheet. The conductive small bearing is arranged in the shaft hole of the motor rotor, the outer ring of the conductive small bearing is abutted against the inner wall of the shaft hole, meanwhile, a conductive elastic sheet is pressed on the inner ring of the conductive small bearing, and the other end of the conductive elastic sheet is grounded, so that shaft current on the motor rotor can be conducted and discharged through the conductive small bearing and the conductive elastic sheet, and the current leaked to the main bearing is reduced, and the electric corrosion of the main bearing caused by the shaft current is avoided. In the scheme, the inner ring of the small conductive bearing is stressed on one side, and the reliability of the bearing is problematic when the bearing is operated for a long time. Thus, it remains a need to seek simple and effective solutions to prevent bearing galvanic corrosion of a load bearing during a life cycle.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the shaft end connecting structure capable of preventing bearing electric corrosion and the motor, which are simple in structure, low in cost and convenient to assemble, disassemble and maintain.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a prevent axle head connection structure of bearing electric corrosion, includes end cover, pivot, load bearing, conductive connection subassembly and ground connection fixed part, the pivot is fixed through load bearing on the end cover, the tip of pivot has along the outside installation axle that extends of axis, conductive bearing's inner circle with the periphery fixed fit of installation axle, conductive bearing's diameter is less than load bearing's diameter, conductive connection subassembly includes overcoat piece and inserts, the overcoat piece is installed on the ground connection fixed part, the embedded end of inserts is located the cup joint end of overcoat piece, non-embedded end with conductive bearing's outer lane fastening connection, the inserts has two at least, and follows conductive bearing's circumference evenly arranges, each the embedded end of inserts is equipped with the elastic component, is used for with the insert elasticity limit is located conductive bearing with between the cup joint end of overcoat piece.
The shaft end connecting structure for preventing bearing electric corrosion is preferable, the sleeved end of the outer sleeve is provided with a closing-in structure, the inner insert is provided with a sliding part and a limiting part, the sliding part is arranged in the closing-in structure in a penetrating mode, and the limiting part is used for preventing the inner insert from being pulled out from the closing-in structure.
The shaft end connecting structure for preventing bearing electric corrosion is preferable, the closing-in structure comprises a closing-in shoulder and a closing-in neck, the periphery of the sliding part is attached to the inner periphery of the closing-in neck, and the periphery of the limiting part is attached to the inner periphery of the closing-in shoulder.
In the shaft end connecting structure for preventing bearing from electric corrosion, preferably, the external sleeve is a sleeve, an external thread is arranged on the periphery of a non-sleeved end of the sleeve, and a screw hole matched with the external thread is formed in the grounding fixing part; or, the external sleeve is a sleeve, the inner periphery of the non-sleeved end of the sleeve is provided with an internal thread, the grounding fixing part is provided with a first boss, and the outer periphery of the first boss is provided with an external thread matched with the internal thread.
According to the shaft end connecting structure for preventing bearing electric corrosion, preferably, the outer sleeve piece is the mounting disc, at least two closing-in structures are arranged on the end face of the mounting disc in a central symmetry mode, and each closing-in structure is provided with the embedded piece and the elastic piece which are matched with the closing-in structure.
The shaft end connecting structure for preventing bearing electric corrosion is characterized in that preferably, the center of the end face of the sleeved end of the mounting plate is provided with a first mounting groove which is concave inwards, the grounding fixing part is provided with a second mounting groove, the center of the second mounting groove is provided with a second boss, the non-sleeved end of the mounting plate is embedded into the second mounting groove, and the bottom of the first mounting groove is bonded with the second boss and fastened through a screw.
In the shaft end connecting structure for preventing bearing electric corrosion, preferably, the non-embedded end of the embedded piece is abutted against the end face of the outer ring of the conductive bearing.
In the shaft end connecting structure for preventing bearing from being corroded electrically, preferably, the embedded end of the embedded piece is provided with a groove for installing the elastic piece.
In the shaft end connecting structure for preventing bearing from being corroded electrically, preferably, the elastic piece is a spring.
In the shaft end connecting structure for preventing bearing from being electrically corroded, preferably, the elastic piece is located between the embedded end of the embedded piece and the grounding fixing portion.
In the shaft end connecting structure for preventing bearing from being electrically corroded, preferably, a gasket is arranged between the elastic piece and the grounding fixing part.
In the shaft end connection structure for preventing bearing from being corroded electrically, preferably, the grounding fixing portion is a junction box cover plate, and the junction box cover plate is fixed on the outer side of the end cover and forms a closed conductive bearing chamber with the end cover.
The invention also provides a motor, which comprises the shaft end connecting structure for preventing bearing electric corrosion, wherein the end cover comprises a front end cover and a rear end cover, the front end of the rotating shaft extends out of the front end cover, the grounding fixing part is fixed on the outer side of the front end cover, and the shaft end structure is positioned between the front end of the rotating shaft and the grounding fixing part.
The motor is characterized in that the end cover comprises a front end cover and a rear end cover, the rear end of the rotating shaft extends out of the rear end cover, the grounding fixing part is fixed on the outer side of the rear end cover, and the shaft end structure is located between the rear end of the rotating shaft and the grounding fixing part.
The motor is realized in another mode that the end cover comprises a front end cover and a rear end cover, the front end of the rotating shaft extends out of the front end cover, the rear end of the rotating shaft extends out of the rear end cover, the two grounding fixing parts are respectively arranged on the outer sides of the front end cover and the rear end cover, the two shaft end structures are respectively arranged at the front end and the rear end of the rotating shaft.
Explanation of related terms in the present invention:
dc bus voltage: the voltage for supplying the electric drive system to the battery in the whole vehicle.
And (3) bearing: to carry radial and axial loads of the motor, bearings for supporting the rotor of the motor are provided.
Compared with the prior art, the invention has the advantages that:
(1) The shaft end connecting structure adopts the conductive connecting component to directly guide the shaft current on the rotor to the ground from the end part of the rotating shaft, so that the bearing can be effectively prevented from being electrically corroded, the structure and the performance of the bearing are not influenced by the axial and radial movement of the rotor in the running process of the motor, and the scheme robustness is good. The outer ring of the conductive bearing is subjected to axial force of more than two inserts which are uniformly arranged, so that the conductive bearing is uniformly stressed, and as the embedded end of the insert is provided with the elastic piece, the insert applies certain axial pretightening force to the conductive bearing by adjusting the rigidity of the elastic piece, and the conductive bearing is not completely stressed rigidly, so that in the running process of the motor, even if the conductive bearing axially moves, the conductive bearing can be always in good contact with the insert. And the nested structure makes the inner insert have radial holding force from the outer sleeve member, and can overcome the influence caused by radial shaking of the conductive bearing in the running process of the motor.
The invention adopts the mode that the elastic nested component is contacted with the outer ring of the conductive bearing for the first time, conducts flow guiding on shaft current, has even stress on the conductive bearing, has simple structure, less number of parts, high reliability and lower cost, is very convenient to install and disassemble and is convenient for later maintenance.
(2) The motor provided by the invention has the advantages of the shaft end connecting structure because the shaft end connecting structure is arranged, and the shaft end connecting structure can effectively avoid the electric corrosion of the bearing, so that the running stability of the motor can be improved, and the service life of the motor can be prolonged.
Drawings
FIG. 1 is a schematic view showing the structure of the shaft end connection for preventing bearing galvanic corrosion according to embodiment 1 of the invention.
Fig. 2 is an exploded perspective view of the conductive connection assembly according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of the motor structure of embodiment 1 of the present invention.
FIG. 4 is a schematic view of the structure of the shaft end connection of the embodiment 2 of the present invention for preventing the bearing from being corroded electrically.
Fig. 5 is a schematic structural diagram of a conductive connection assembly according to embodiment 2 of the present invention.
Fig. 6 is an exploded perspective view of the conductive connection assembly of embodiment 2 of the present invention.
Fig. 7 is a schematic diagram of the motor structure of embodiment 2 of the present invention.
Legend description:
1. an end cap; 11. a front end cover; 12. a rear end cover; 13. a housing; 14. a stator; 15. a rotor; 2. a rotating shaft; 21. a mounting shaft; 3. a load bearing; 31. a front load bearing; 32. a rear load bearing; 4. a conductive bearing; 5. a conductive connection assembly; 50. a closing-in structure; 501. a closing shoulder; 502. closing up the neck; 51. an outer sleeve; 511. a first mounting groove; 52. an insert; 521. a sliding part; 522. a limit part; 6. an elastic member; 7. a grounding fixing part; 71. a second mounting groove; 711. a second boss; 8. a gasket.
Detailed Description
The invention is described in further detail below with reference to specific examples and figures of the specification.
Example 1:
fig. 1 to 3 show an embodiment of the shaft end connection structure for preventing bearing galvanic corrosion according to the present invention, which comprises an end cap 1, a rotating shaft 2, a carrying bearing 3, a conductive bearing 4, a conductive connection assembly and a grounding fixing portion 7, wherein the rotating shaft 2 is fixed on the end cap 1 through the carrying bearing 3, the end portion of the rotating shaft 2 is provided with a mounting shaft 21 extending outwards along the axis, the inner ring of the conductive bearing 4 is fixedly matched with the mounting shaft 21, the diameter of the conductive bearing 4 is smaller than that of the carrying bearing 3, the conductive connection assembly 5 comprises an outer sleeve 51 and an inner insert 52, the outer sleeve 51 is mounted on the grounding fixing portion 7, the embedded end of the inner insert 52 is positioned in the sleeved end of the outer sleeve 51, the non-embedded end is fixedly connected with the outer ring of the conductive bearing 4, at least two inner inserts 52 are uniformly arranged along the circumferential direction of the conductive bearing 4, and the embedded end of each inner insert 52 is provided with an elastic member 6 for elastically limiting the inner insert 52 between the conductive bearing 4 and the sleeved end of the outer sleeve 51.
The motor is used as a specific application example, the motor comprises a shell 13, a stator 14, a rotor 15, a rotating shaft 2 and an end cover 1, the end cover 1 comprises a front end cover 11 and a rear end cover 12, the front end cover 11 and the rear end cover 12 are respectively fixed on the shell 13, two ends of the rotating shaft 2 are respectively arranged on the front end cover 11 and the rear end cover 12 through two bearing bearings 3, the rotor 15 is fixed on the rotating shaft 2, the stator 14 is arranged on the periphery of the rotor 15, and a shaft end connecting structure for preventing bearing galvanic corrosion is arranged at the end part of the rotating shaft 2.
In the running process of the motor, the conductive bearing 4, the front bearing 31 and the rear bearing 32 are all arranged on the rotor 15 and are an equipotential body; the stator 14, the casing 13, the front end cover 11, the rear end cover 12, the grounding fixing part 7, the conductive connecting assembly 5 and the elastic member 6 are connected with each other to be another equipotential body, and the motor housing, i.e. the casing 13, is grounded, and the potential is zero. Thus, the potential of the conductive bearing 4, the front carrier bearing 31, the rear carrier bearing 32 to ground is equal, i.e. the shaft voltages are equal. Since the conductive bearing 4 has a smaller diameter than the front carrier bearing 31 and the rear carrier bearing 32, the conductive bearing 4 is more susceptible to discharge, i.e. shaft current, at the same shaft voltage. Shaft current passes through the conductive bearing 4 to the conductive connecting component 5, then passes through the conductive connecting component 5 to the grounding fixing part 7, and finally to the ground; when the discharge occurs in the conductive bearing 4, the discharge does not occur in the front bearing 31 and the rear bearing 32, thereby protecting the front bearing and the rear bearing from the occurrence of bearing galvanic corrosion.
The inner inserts 52 with conductivity are in contact with the outer ring of the conductive bearing 4 in the axial direction, and the inner inserts 52 apply a certain axial pretightening force to the conductive bearing 4 by adjusting the rigidity of the elastic members, so that the inner inserts 52 can be in good contact with the inner inserts 52 all the time even if the conductive bearing 4 has axial movement in the running process of the motor, and the inner inserts 52 and the corresponding elastic members 6 are at least two groups and are uniformly arranged to be in contact with the outer ring of the conductive bearing 4, so that the stress of the conductive bearing 4 is uniform. And the nested structure enables the inner insert 52 to have radial holding force from the outer sleeve 51, so that the influence caused by radial shaking of the conductive bearing 4 in the running process of the motor can be overcome.
In this embodiment, the sleeve end of the outer sleeve 51 has a closing structure 50, the inner insert 52 has a sliding portion 521 and a limiting portion 522, the sliding portion 521 is disposed in the closing structure 50, and the limiting portion 522 is used for preventing the inner insert 52 from being pulled out from the closing structure 50. The fit of the closing-in structure 50 and the limiting portion 522 can reduce the volume of the insert 52 to reduce the weight and ensure the firmness and stability of the assembly.
In this embodiment, the necking structure 50 includes a necking shoulder 501 and a necking neck 502, the outer periphery of the sliding portion 521 is attached to the inner periphery of the necking neck 502, and the outer periphery of the limiting portion 522 is attached to the inner periphery of the necking shoulder 501. The radial holding force applied by the insert 52 can be enhanced, which is beneficial to resisting the influence caused by radial shaking of the conductive bearing 4 in the motor operation process.
As shown in fig. 2, the necking structure 50 of the present embodiment is in a shape of a short neck funnel, the insert 52 is in a shape of a long neck funnel, the long neck funnel is stacked in the short neck funnel, and the long neck (i.e. the sliding portion 521) of the long neck funnel passes through the short neck (i.e. the necking neck 502) of the short neck funnel.
In this embodiment, the external sleeve 51 is a sleeve, the non-sleeved end of the sleeve is designed with an external thread structure, and a threaded hole capable of being matched with the external thread structure is formed in the grounding fixing portion 7, so that the sleeve is detachably mounted on the grounding fixing portion 7, the number of parts is small, and the disassembly and assembly are convenient.
In this embodiment, the non-embedded end of the insert 52 abuts against the end face of the outer ring of the conductive bearing 4, so that the assembly and disassembly are facilitated. Because the radial runout of the rotating shaft is limited by the radial clearance of the bearing, the radial runout is generally within 0.1mm, and the good contact between the inner insert and the conductive bearing can be ensured as long as the abutting position of the inner insert is more than 0.2mm from the width of the inner ring and the width of the outer ring of the end face of the conductive bearing, so that stable grounding is realized.
In this embodiment, the embedded end of the insert 52 is provided with a recess for mounting the elastic member 6, which is advantageous for accurate and rapid positioning and mounting of the elastic member. Of course, when the diameter of the elastic member 6 is equal to the inner diameter of the outer sleeve member 51, the insertion end of the inner insert 52 can be well fitted with the elastic member 6 without a groove.
In this embodiment, the elastic member 6 is located between the insertion end of the insert 52 and the ground fixing portion 7. In other embodiments, the elastic member 6 may be mounted on the bottom end of the outer sleeve 51 or on an internally disposed mounting member, depending on the actual length of the elastic member 6 desired.
In this embodiment, the elastic member 6 is a spring, and a spacer 8 is disposed between the spring and the grounding fixing portion 7, so that the spring is pressed on the spacer 8, and the spring is stressed stably and does not incline.
In this embodiment, the grounding fixing portion 7 is a junction box cover plate, and the junction box cover plate is fixed on the outer side of the end cover 1, and forms a closed conductive bearing chamber with the end cover 1, so that the space is independent, and when the junction box cover plate is installed and removed, the junction box cover plate is only required to be removed, and the junction box cover plate is simple in structure and quite convenient to detach and install.
In the shaft end connecting structure for preventing bearing electric corrosion of the embodiment, during installation, the inner ring of the conductive bearing 4 is in interference fit with the outer periphery of the installation shaft 21 extending out of the rear end cover 12, the conductive bearing 4 is a deep groove ball bearing with dust covers on two sides, the conductive inner insert 52 is assembled in the outer sleeve 51, the limiting part 522 of the inner insert 52 is attached to the closing shoulder 501, the sliding part 521 is attached to the closing neck 502 and penetrates through the closing neck 502, the spring is assembled at the embedded end of the inner insert 52, the non-sleeved end of the outer sleeve 51 is screwed onto the junction box cover plate, and finally the junction box cover plate is fixed on the rear end cover 12 through screws.
As shown in fig. 3, the motor comprises the shaft end connecting structure for preventing bearing electric corrosion in the embodiment, the end cover 1 comprises a front end cover 11 and a rear end cover 12, the rear end of the rotating shaft 2 extends out of the rear end cover 12, a junction box cover plate is fixed on the outer side of the rear end cover 12, and the shaft end structure is positioned between the rear end of the rotating shaft 2 and the junction box cover plate.
The motor has the advantages of the shaft end connecting structure because the shaft end connecting structure for preventing bearing electric corrosion is arranged, and the shaft end connecting structure can effectively prevent bearing electric corrosion of the bearing 3, so that the running stability and the service life of the motor are improved.
In other embodiments, the shaft end connection structure for preventing bearing galvanic corrosion may also be disposed at the front end of the rotating shaft 2, specifically, the front end of the rotating shaft 2 extends out of the front end cover 11, the junction box cover plate is fixed on the outer side of the front end cover 11, and the shaft end connection structure is located between the front end of the rotating shaft 2 and the junction box cover plate.
In other embodiments, shaft end connection structures for preventing bearing galvanic corrosion can be arranged at the front end and the rear end of the rotating shaft 2 at the same time.
Example 2:
fig. 4 to 7 show an embodiment of the shaft end connection structure for preventing bearing galvanic corrosion according to the present invention, which comprises an end cap 1, a rotating shaft 2, a carrying bearing 3, a conductive bearing 4, a conductive connection assembly 5 and a grounding fixing portion 7, wherein the rotating shaft 2 is fixed on the end cap 1 through the carrying bearing 3, the end portion of the rotating shaft 2 is provided with a mounting shaft 21 extending outwards along the axis, the inner ring of the conductive bearing 4 is fixedly matched with the mounting shaft 21, the diameter of the conductive bearing 4 is smaller than that of the carrying bearing 3, the conductive connection assembly 5 comprises an outer sleeve 51 and an inner insert 52, the outer sleeve 51 is mounted on the grounding fixing portion 7, the embedded end of the inner insert 52 is positioned in the sleeved end of the outer sleeve 51, the non-embedded end is fixedly connected with the outer ring of the conductive bearing 4, at least two inner inserts 52 are uniformly arranged along the circumferential direction of the conductive bearing 4, and the embedded end of each inner insert 52 is provided with an elastic member 6 for elastically limiting the inner insert 52 between the sleeved ends of the conductive bearing 4 and the outer sleeve 51.
The motor is used as a specific application example, the motor comprises a shell 13, a stator 14, a rotor 15, a rotating shaft 2 and an end cover 1, the end cover 1 comprises a front end cover 11 and a rear end cover 12, the front end cover 11 and the rear end cover 12 are respectively fixed on the shell 13, two ends of the rotating shaft 2 are respectively arranged on the front end cover 11 and the rear end cover 12 through two bearing bearings 3, the rotor 15 is fixed on the rotating shaft 2, the stator 14 is arranged on the periphery of the rotor 15, and a shaft end connecting structure for preventing bearing galvanic corrosion is arranged at the end part of the rotating shaft 2.
In the running process of the motor, the conductive bearing 4, the front bearing 31 and the rear bearing 32 are all arranged on the rotor 15 and are an equipotential body; the stator 14, the housing 13, the front end cover 11, the rear end cover 12, the ground fixing part 7, the nesting component 5 and the elastic element 6 are connected with each other to be another equipotential body, and the motor housing, i.e. the housing 13, is grounded, and the potential is zero. Thus, the potential of the conductive bearing 4, the front carrier bearing 31, the rear carrier bearing 32 to ground is equal, i.e. the shaft voltages are equal. Since the conductive bearing 4 has a smaller diameter than the front carrier bearing 31 and the rear carrier bearing 32, the conductive bearing 4 is more susceptible to discharge, i.e. shaft current, at the same shaft voltage. The shaft current passes through the conductive bearing 4 to the conductive connecting component, then passes through the conductive connecting component to the grounding fixing part 7, and finally reaches the ground; when the discharge occurs in the conductive bearing 4, the discharge does not occur in the front bearing 31 and the rear bearing 32, thereby protecting the front bearing and the rear bearing from the occurrence of bearing galvanic corrosion.
The inner inserts 52 with conductivity are in contact with the outer ring of the conductive bearing 4 in the axial direction, and the inner inserts 52 apply a certain axial pretightening force to the conductive bearing 4 by adjusting the rigidity of the elastic members, so that the inner inserts 52 can be in good contact with the inner inserts 52 all the time even if the conductive bearing 4 has axial movement in the running process of the motor, and the inner inserts 52 and the corresponding elastic members 6 are at least two groups and are uniformly arranged to be in contact with the outer ring of the conductive bearing 4, so that the stress of the conductive bearing 4 is uniform.
In this embodiment, the sleeve end of the outer sleeve 51 has a closing structure 50, the inner insert 52 has a sliding portion 521 and a limiting portion 522, the sliding portion 521 is disposed in the closing structure 50, and the limiting portion 522 is used for preventing the inner insert 52 from being pulled out from the closing structure 50. The fit of the closing-in structure 50 and the limiting portion 522 can reduce the volume of the insert 52 to reduce the weight and ensure the firmness of assembly.
In this embodiment, the necking structure 50 includes a necking shoulder 501 and a necking neck 502, the outer periphery of the sliding portion 521 is attached to the inner periphery of the necking neck 502, and the outer periphery of the limiting portion 522 is attached to the inner periphery of the necking shoulder 501. The radial forces to which the insert 52 is subjected are thereby reinforced, which is advantageous for resisting the effects of radial play of the conductive bearing 4 during operation of the motor.
As shown in fig. 4, 5 and 6, in this embodiment, the outer sleeve 51 is a mounting disc, and at least two closing structures 50 are symmetrically arranged on the end surface of the sleeved end of the mounting disc in a central manner, and each closing structure 50 is provided with an insert 52 and an elastic member 6 matched with the closing structure.
In this embodiment, the center of the end face of the sleeved end of the mounting plate is provided with a first mounting groove 511 recessed inwards, the grounding fixing portion 7 is provided with a second mounting groove 71, the center of the second mounting groove 71 is provided with a second boss 711, the non-sleeved end of the mounting plate is embedded into the second mounting groove 71, and the bottom of the first mounting groove 511 is attached to the second boss 711 and fastened by a screw.
In this embodiment, the non-embedded end of the insert 52 abuts against the end face of the outer ring of the conductive bearing 4.
In this embodiment, the embedded end of the insert 52 is provided with a recess for mounting the elastic member 6, which is advantageous for accurate and rapid positioning and mounting of the elastic member.
In this embodiment, the elastic member 6 is located between the insertion end of the insert 52 and the ground fixing portion 7.
In this embodiment, the grounding fixing portion 7 is a junction box cover plate, and the junction box cover plate is fixed on the outer side of the end cover 1, and forms a closed conductive bearing chamber with the end cover 1, so that the space is independent, and when the junction box cover plate is installed and removed, the junction box cover plate is only required to be removed, and the junction box cover plate is simple in structure and quite convenient to detach and install.
In the shaft end connecting structure for preventing bearing electric corrosion of this embodiment, during installation, the inner ring of the conductive bearing 4 is in interference fit with the outer periphery of the installation shaft 21 extending out of the rear end cover 12, the conductive bearing 4 is a deep groove ball bearing with dust covers on two sides, the conductive inner insert 52 is assembled in the outer sleeve, the limiting part 522 of the inner insert 52 is attached to the closing shoulder 501, the sliding part 521 is attached to the closing neck 502 and penetrates through the closing neck 502, the spring is assembled at the embedded end of the inner insert 52, the outer sleeve 51, namely the non-sleeved end of the installation disc, is embedded into the second installation groove 71, and the bottom of the first installation groove 511 is attached to the second boss 711 in the second installation groove 71 and fastened by a screw. Finally, the terminal box cover plate is fixed on the rear end cover 12 through screws.
As shown in fig. 7, the motor comprises the shaft end connecting structure for preventing bearing electric corrosion in the embodiment, the end cover 1 comprises a front end cover 11 and a rear end cover 12, the rear end of the rotating shaft 2 extends out of the rear end cover 12, a junction box cover plate is fixed on the outer side of the rear end cover 12, and the shaft end structure is positioned between the rear end of the rotating shaft 2 and the junction box cover plate.
The motor has the advantages of the shaft end connecting structure because the shaft end connecting structure for preventing bearing electric corrosion is arranged, and the shaft end connecting structure can effectively prevent bearing electric corrosion of the bearing 3, so that the running stability and the service life of the motor are improved.
In other embodiments, the shaft end connection structure for preventing bearing galvanic corrosion may also be disposed at the front end of the rotating shaft 2, specifically, the front end of the rotating shaft 2 extends out of the front end cover 11, the junction box cover plate is fixed on the outer side of the front end cover 11, and the shaft end connection structure is located between the front end of the rotating shaft 2 and the junction box cover plate.
In other embodiments, shaft end connection structures for preventing bearing galvanic corrosion can be arranged at the front end and the rear end of the rotating shaft 2 at the same time.
The above is only a preferred embodiment of the present invention, the scope of the present invention is not limited to the above examples, and the technical features of the above-described embodiments of the present invention may be combined with each other as long as they do not collide with each other, and all technical solutions belonging to the concept of the present invention are within the scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. An anti-bearing electric corrosion shaft end connecting structure is characterized in that: including end cover (1), pivot (2), load bearing (3), electrically conductive bearing (4), electrically conductive coupling assembling (5) and ground connection fixed part (7), pivot (2) are fixed through load bearing (3) on end cover (1), the tip of pivot (2) has along the outside installation axle (21) of extension of axis, the inner circle of electrically conductive bearing (4) with the periphery fixed fit of installation axle (21), the diameter of electrically conductive bearing (4) is less than the diameter of load bearing (3), electrically conductive coupling assembling (5) include overcoat piece (51) and inserts (52), overcoat piece (51) are installed on ground connection fixed part (7), the embedded end of inserts (52) is located in the cup joint end of overcoat piece (51), non-embedded end with the outer lane fastening connection of electrically conductive bearing (4), inserts (52) have two at least, and follow electrically conductive bearing (4) circumference fixed fit, each inserts (52) are equipped with the diameter of bearing (3), each inserts (52) are equipped with elasticity end (6) and are used for with elasticity end (52) between the overcoat piece (4).
2. The shaft end connecting structure for preventing bearing galvanic corrosion according to claim 1, wherein: the sleeve joint end of the outer sleeve piece (51) is provided with a closing-in structure (50), the inner insert piece (52) is provided with a sliding part (521) and a limiting part (522), the sliding part (521) is arranged in the closing-in structure (50) in a penetrating mode, and the limiting part (522) is used for preventing the inner insert piece (52) from being pulled out from the closing-in structure (50) outwards.
3. The shaft end connecting structure for preventing bearing galvanic corrosion according to claim 2, wherein: the closing-in structure (50) comprises a closing-in shoulder (501) and a closing-in neck (502), wherein the outer periphery of the sliding part (521) is attached to the inner periphery of the closing-in neck (502), and the outer periphery of the limiting part (522) is attached to the inner periphery of the closing-in shoulder (501).
4. A shaft end connecting structure for preventing bearing galvanic corrosion according to claim 3, wherein: the sleeve piece (51) is a sleeve, an external thread is arranged on the periphery of the non-sleeved end of the sleeve, and a screw hole matched with the external thread is formed in the grounding fixing part (7); or, the jacket piece (51) is a sleeve, an internal thread is arranged on the inner periphery of the non-sleeved end of the sleeve, a first boss is arranged on the grounding fixing part (7), and an external thread matched with the internal thread is arranged on the outer periphery of the first boss.
5. A shaft end connecting structure for preventing bearing galvanic corrosion according to claim 3, wherein: the outer sleeve member (51) is a mounting disc, at least two closing-in structures (50) are arranged on the end face of the mounting disc in a central symmetry mode, and each closing-in structure (50) is provided with an embedded member (52) and an elastic member (6) which are matched with the closing-in structure.
6. The shaft end connecting structure for preventing bearing galvanic corrosion according to claim 5, wherein: the end face center of the sleeved end of the mounting plate is provided with a first mounting groove (511) recessed inwards, a second mounting groove (71) is formed in the grounding fixing portion (7), a second boss (711) is arranged in the center of the second mounting groove (71), the non-sleeved end of the mounting plate is embedded into the second mounting groove (71), and the bottom of the first mounting groove (511) is attached to the second boss (711) and fastened through a screw.
7. The shaft end connecting structure for preventing bearing electric corrosion according to any one of claims 1 to 6, wherein: the non-embedded end of the embedded piece (52) is abutted against the end face of the outer ring of the conductive bearing (4).
8. The shaft end connecting structure for preventing bearing electric corrosion according to any one of claims 1 to 6, wherein: the embedded end of the embedded piece (52) is provided with a groove for installing the elastic piece (6);
and/or the elastic piece (6) is a spring.
9. The shaft end connecting structure for preventing bearing electric corrosion according to any one of claims 1 to 6, wherein: the elastic piece (6) is positioned between the embedded end of the embedded piece (52) and the grounding fixing part (7);
and/or the grounding fixing part (7) is a junction box cover plate, and the junction box cover plate is fixed on the outer side of the end cover (1) and forms a closed conductive bearing chamber with the end cover (1).
10. An electric motor, characterized by comprising the shaft end connection structure for preventing bearing electric corrosion according to any one of claims 1 to 9, wherein the end cover (1) comprises a front end cover (11) and a rear end cover (12), the front end of the rotating shaft (2) extends out of the front end cover (11), the grounding fixing part (7) is fixed on the outer side of the front end cover (11), and the shaft end connection structure is positioned between the front end of the rotating shaft (2) and the grounding fixing part (7);
and/or, the end cover (1) comprises a front end cover (11) and a rear end cover (12), the rear end of the rotating shaft (2) extends out of the rear end cover (12), the grounding fixing part (7) is fixed on the outer side of the rear end cover (12), and the shaft end connecting structure is positioned between the rear end of the rotating shaft (2) and the grounding fixing part (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111544915.5A CN116266724A (en) | 2021-12-16 | 2021-12-16 | Shaft end connecting structure capable of preventing bearing from being electrically corroded and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111544915.5A CN116266724A (en) | 2021-12-16 | 2021-12-16 | Shaft end connecting structure capable of preventing bearing from being electrically corroded and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116266724A true CN116266724A (en) | 2023-06-20 |
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ID=86743265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111544915.5A Pending CN116266724A (en) | 2021-12-16 | 2021-12-16 | Shaft end connecting structure capable of preventing bearing from being electrically corroded and motor |
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| Country | Link |
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| CN (1) | CN116266724A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117411249A (en) * | 2023-10-26 | 2024-01-16 | 浙江大学先进电气装备创新中心 | Electric excitation motor capable of avoiding overcurrent damage by utilizing conductive bearing |
-
2021
- 2021-12-16 CN CN202111544915.5A patent/CN116266724A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117411249A (en) * | 2023-10-26 | 2024-01-16 | 浙江大学先进电气装备创新中心 | Electric excitation motor capable of avoiding overcurrent damage by utilizing conductive bearing |
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