Motor floating bearing seat structure and motor thereof
By adding conductive bearings and elastic conductive connectors at the end of the motor shaft, the electric corrosion and NVH problems of motor bearings are solved, and more precise preload control is achieved, improving the operating stability of the motor.
Patent Information
- Application Number
- CN202421094673.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-16
AI Technical Summary
Due to the electric corrosion of the bearings and axial squirming caused by shaft voltage, the preloading force of the existing motors is inaccurate, resulting in poor preloading effect.
Add conductive bearings to the end of the motor shaft, provide preloading force by elastic conductive connectors instead of the corrugated washer, and current is deducted through the conductive mounting bracket to avoid electrical corrosion and improve preload control accuracy.
It effectively prevents electric corrosion of bearings, improves the control accuracy of bearing preload, and improves the NVH problem of motors.
Smart Images
Figure CN222282936U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a motor floating bearing seat structure and a motor thereof. Background Art
[0002] Due to the existence of shaft voltage in existing motors, the current can break through the grease (oil film) inside the bearing, generate electric shock on the contact surface of the bearing steel ball, damage the bearing groove, and thus cause electrical corrosion of the bearing.
[0003] In addition, due to the axial clearance of the bearing itself, the rotor will inevitably produce axial movement, causing motor NVH problems. The conventional solution is to use a corrugated washer to apply a preload to the bearing to reduce the amount of rotor movement. However, since the dimensional chain of the space in which the corrugated washer is located is too long and the tolerance is too large, the working height of the corrugated washer deviates too much from the theoretical working height. At the same time, there are errors in the elastic coefficient, thickness, inner and outer diameter dimensions of the corrugated washer material itself, resulting in a large deviation between the actual preload and the theoretical preload, thereby failing to achieve the preset preload effect, and then causing motor NVH problems or bearing eccentric wear problems. Summary of the invention
[0004] In order to solve the above problems, the first purpose of the utility model is to provide a motor floating bearing seat structure, by adding a conductive bearing at the rear end of the motor shaft, a spring is set outside the conductive bearing for pre-tightening, and the axial tension of the spring replaces the pre-tightening force of the corrugated washer on the working bearing, thereby improving the pre-tightening effect. At the same time, the shaft voltage on the motor shaft is led out through the conductive bearing, thereby avoiding electrical corrosion of the working bearing due to the shaft current; the second purpose of the utility model is to provide a motor having the above-mentioned motor floating bearing seat structure.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0006] A motor floating bearing seat structure comprises a motor shaft and a rear end cover, wherein the rear end cover is fixedly covered on the outer side of the end of the motor shaft; it is characterized in that a conductive bearing is sleeved on the end of the motor shaft, a bearing seat is sleeved on the outer side of the conductive bearing, a conductive mounting bracket is fixedly connected inside the rear end cover, the conductive mounting bracket is located axially outside the bearing seat, the rear end cover is grounded through a conductor, and a plurality of elastic conductive connecting parts are pre-tightened and connected between the conductive mounting bracket and the bearing seat.
[0007] Preferably, the plurality of elastic conductive connecting members are regularly connected circumferentially between the conductive mounting bracket and the bearing seat.
[0008] Preferably, an assembly groove is constructed on the inner side of the rear end cover at the outer side of the end of the motor shaft, and a plurality of screw columns are extended upward on the side wall of the assembly groove. The conductive mounting bracket is annular and fits on the upper ends of the plurality of screw columns. A plurality of bolt holes are correspondingly provided on the conductive mounting bracket and the screw columns, wherein positioning pins are inserted into the plurality of bolt holes to position the conductive mounting bracket on the screw columns.
[0009] Preferably, bolts are screwed into a plurality of bolt holes to fix the conductive mounting bracket to the screw column.
[0010] Preferably, the inner wall of the conductive mounting bracket extends inwardly corresponding to the bolt hole to form a first flange, and the bottom of the side wall of the bearing seat extends outwardly to form a second flange corresponding to the first flange, and the first flange and the second flange are respectively provided with a first connecting hole and a second connecting hole, and the elastic conductive connecting member is hooked between the corresponding first connecting hole and the second connecting hole.
[0011] Preferably, the elastic conductive connecting member is a spring.
[0012] Preferably, a shaft retaining ring is fitted and clamped at the end of the motor shaft on the axial outer side of the conductive bearing.
[0013] Preferably, the conductive bearing is interference fit with the motor shaft.
[0014] Preferably, the conductive bearing is interference fit with the bearing seat.
[0015] A motor, characterized by comprising any one of the motor floating bearing seat structures described above.
[0016] The utility model adopts the above technical solution, a conductive bearing is sleeved at the end of the motor shaft, a bearing seat is sleeved on the outer side of the conductive bearing, a conductive mounting bracket is provided on the axial outer side of the bearing seat, a plurality of elastic conductive connectors are provided for pre-tightening connection between the conductive mounting bracket and the bearing seat, the conductive mounting bracket is fixedly connected and arranged in the rear end cover, and the rear end cover is grounded, so that the current on the motor shaft can be quickly discharged through the conductive bearing, the bearing seat, the elastic conductive connector, the conductive mounting bracket to the rear end cover in sequence, which can effectively prevent the working bearing from generating electrical corrosion. In addition, a plurality of elastic conductive connectors replace the corrugated washers to pre-tighten the working bearing, so that the bearing seat is floatingly arranged in the rear end cover, which improves the control accuracy of the bearing pre-tightening force, thereby achieving a better control effect on the axial movement of the rotor, and thus improving the NVH problem of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a motor.
[0018] Figure 2It is a schematic diagram of the assembly between the bearing seat, spring and conductive mounting bracket.
[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the conductive mounting bracket.
[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the bearing seat.
[0021] Figure 5 Schematic diagram of the assembly slot layout.
[0022] Figure 6 A schematic diagram of the cross-sectional structure of the motor. DETAILED DESCRIPTION
[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.
[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Embodiment 1:
[0028] like Figures 2~6 A motor floating bearing seat structure shown in the figure includes a motor shaft 1 and a rear end cover 2, and the rear end cover 2 is fixedly covered on the outer side of the end of the motor shaft 1; the end of the motor shaft 1 is sleeved with a conductive bearing 5, and the outer side of the conductive bearing 5 is sleeved with a bearing seat 6, and a conductive mounting bracket 7 is fixedly connected inside the rear end cover 2, and the conductive mounting bracket 7 is located axially outside the bearing seat 6, the rear end cover 2 is grounded through a conductor, and a plurality of elastic conductive connecting parts are pre-tightened and connected between the conductive mounting bracket 7 and the bearing seat 6.
[0029] In the above technical solution, a conductive bearing 5 is sleeved at the end of the motor shaft 1, a bearing seat 6 is sleeved on the outer side of the conductive bearing 5, a conductive mounting bracket 7 is provided on the axial outer side of the bearing seat 6, a plurality of elastic conductive connecting pieces are pre-tightened and connected between the conductive mounting bracket 7 and the bearing seat 6, the conductive mounting bracket 7 is fixedly connected and arranged in the rear end cover, and the rear end cover is grounded.
[0030] Therefore, the current on the motor shaft can be quickly discharged to the rear end cover through the conductive bearing, the bearing seat, the elastic conductive connector, and the conductive mounting bracket in sequence, which can effectively prevent the working bearing 100 from generating electrical corrosion.
[0031] In addition, multiple elastic conductive connectors replace the wave washers to pre-tighten the working bearing 100, so that the bearing seat is floatingly arranged in the rear end cover.
[0032] Furthermore, the plurality of elastic conductive connectors are connected regularly in the circumferential direction between the conductive mounting bracket 7 and the bearing seat 6. In this technical solution, the plurality of elastic conductive connectors are regularly arranged in the circumferential direction, so that the axial tension in all directions of the bearing seat is relatively uniform, the floating stability of the bearing seat is maintained, and the pre-tightening effect of the elastic conductive connector is improved.
[0033] Furthermore, the inner side of the rear end cover 2 is formed with an assembly groove 8 outside the end of the motor shaft 1, and a plurality of screw columns 9 are extended upward on the side wall of the assembly groove 8. The conductive mounting bracket 7 is annular and fits the upper ends of the plurality of screw columns 9. The conductive mounting bracket 7 and the screw columns 9 are provided with a plurality of bolt holes 10 correspondingly, wherein positioning pins are inserted into the plurality of bolt holes 10 to position the conductive mounting bracket 7 on the screw columns 9. In this technical solution, an assembly groove is formed in the rear end cover, and a conductive mounting bracket is positioned on the assembly groove, so that current can flow out of the rear end cover through the conductive mounting bracket to the assembly groove, and the positioning pin can preliminarily position the conductive mounting bracket on the assembly groove for subsequent assembly.
[0034] Furthermore, bolts are screwed into a plurality of bolt holes 10 to fix the conductive mounting bracket 7 on the screw column 9. In this technical solution, after the conductive mounting bracket and the assembly slot are initially positioned, the conductive mounting bracket is fastened to the assembly slot by bolts, so that the conductive mounting bracket and the assembly slot are fully abutted to facilitate the flow of current.
[0035] Furthermore, the inner wall of the conductive mounting bracket 7 extends inwardly corresponding to the bolt hole 10 to form a first flange 11, and the bottom of the side wall of the bearing seat 6 extends outwardly to form a second flange 12 corresponding to the first flange 11. The first flange 11 and the second flange 12 are respectively provided with a first connection hole 13 and a second connection hole 14, and the elastic conductive connector is hooked between the corresponding first connection hole 13 and the second connection hole 14. In this technical solution, the formation of the first flange and the second flange facilitates the connection of the elastic conductive connector (spring) while maintaining the structural strength of the conductive mounting bracket and the bearing seat.
[0036] Furthermore, the elastic conductive connector is a spring 15. In this technical solution, specifically, the bearing seat and the mounting bracket are connected by four circumferentially regularly arranged springs so that the bearing seat floats in the rear end cover, and the four springs generate axial tension to replace the preload force of the corrugated washer on the working bearing 100. Because the axial length of the spring is much larger than the axial length of the corrugated washer, the axial dimension chain error accounts for a relatively small proportion compared to the axial length of the spring (the axial length of the spring is generally greater than 10mm, while the error of the axial dimension chain is generally in the order of 0.1mm~0.3mm), so the axial dimension chain error has a very limited effect on the preload fluctuation of the spring, which in turn improves the control accuracy of the bearing preload, thereby achieving a better control effect on the axial movement of the rotor, thereby improving the NVH problem of the motor.
[0037] Furthermore, the end of the motor shaft 1 is fitted with a shaft retaining ring 16 on the axial outer side of the conductive bearing 5. In this technical solution, the shaft retaining ring prevents the conductive bearing from axially moving.
[0038] Furthermore, the conductive bearing 5 is interference fit with the motor shaft 1 .
[0039] Furthermore, the conductive bearing 5 and the bearing seat 6 are interference fit. Embodiment 2:
[0040] A motor includes a motor floating bearing seat structure in the first embodiment.
[0041] In this specific embodiment, in view of the electrical corrosion of the existing motor bearings and the motor NVH problem caused by the axial movement of the rotor, the above scheme adds a conductive bearing at the end of the motor shaft. The grease of the conductive bearing adopts conductive grease to make it have conductive properties. The inner ring of the conductive bearing is interference fit with the motor shaft, the outer ring of the conductive bearing is interference fit with the bearing seat, the conductive mounting bracket is connected and installed in the rear end cover, the bearing seat and the conductive mounting bracket are axially misaligned, and the bearing seat and the mounting bracket are connected by four springs arranged regularly in the circumferential direction so that the bearing seat floats in the rear end cover. The four springs generate axial tension to replace the preload force of the wave washer on the working bearing 100. Because the axial length of the spring is much larger than the axial length of the wave washer, the axial dimension chain error accounts for a small proportion compared with the axial length of the spring (the axial length of the spring is generally greater than 10mm, while the error of the axial dimension chain is generally in the order of 0.1mm~0.3mm), so the axial dimension chain error has a very limited effect on the fluctuation of the preload force of the spring, which improves the control accuracy of the bearing preload force in disguised form, thereby achieving a better control effect on the axial movement of the rotor, thereby improving the NVH problem of the motor.
[0042] In addition, the shaft current is conducted to the outer ring through the conductive bearing inner ring, then to the spring through the bearing seat, and then to the rear end cover through the conductive mounting bracket. Finally, the shaft current is led to the earth through the grounding of the rear end cover, thereby avoiding electrical corrosion of the working bearing due to the shaft current.
[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.
Claims
1. A motor floating bearing seat structure, comprising a motor shaft (1) and a rear end cover (2), wherein the rear end cover (2) is fixedly covered on the outer side of the end of the motor shaft (1); characterized in that: A conductive bearing (5) is sleeved at the end of the motor shaft (1), a bearing seat (6) is sleeved on the outer side of the conductive bearing (5), a conductive mounting bracket (7) is fixedly connected inside the rear end cover (2), the conductive mounting bracket (7) is located axially outside the bearing seat (6), the rear end cover (2) is grounded via a conductor, and a plurality of elastic conductive connecting pieces are pre-tightened and connected between the conductive mounting bracket (7) and the bearing seat (6).
2. The motor floating bearing seat structure according to claim 1, characterized in that: The plurality of elastic conductive connecting members are regularly connected in the circumferential direction between the conductive mounting bracket (7) and the bearing seat (6).
3. The motor floating bearing seat structure according to claim 1, characterized in that: An assembly groove (8) is constructed on the inner side of the rear end cover (2) at the outer side of the end of the motor shaft (1), and a plurality of screw columns (9) are provided on the side wall of the assembly groove (8) extending upward. The conductive mounting bracket (7) is annular and fits on the upper ends of the plurality of screw columns (9). A plurality of bolt holes (10) are correspondingly provided on the conductive mounting bracket (7) and the screw columns (9), wherein positioning pins are inserted into the plurality of bolt holes (10) to position the conductive mounting bracket (7) on the screw columns (9).
4. The motor floating bearing seat structure according to claim 3, characterized in that: Bolts are screwed into a plurality of bolt holes (10) to fix the conductive mounting bracket (7) on the screw column (9).
5. The motor floating bearing seat structure according to claim 4, characterized in that: The inner wall of the conductive mounting bracket (7) extends inwardly corresponding to the bolt hole (10) to form a first flange (11), and the bottom of the side wall of the bearing seat (6) extends outwardly to form a second flange (12) corresponding to the first flange (11), and the first flange (11) and the second flange (12) are respectively provided with a first connecting hole (13) and a second connecting hole (14), and the elastic conductive connecting member is hooked between the corresponding first connecting hole (13) and the second connecting hole (14).
6. The motor floating bearing seat structure according to claim 1, characterized in that: The elastic conductive connecting piece is a spring (15).
7. The motor floating bearing seat structure according to claim 1, characterized in that: The end of the motor shaft (1) is fitted and clamped with a shaft retaining ring (16) on the axial outer side of the conductive bearing (5).
8. The motor floating bearing seat structure according to claim 7, characterized in that: The conductive bearing (5) and the motor shaft (1) are interference fit.
9. The motor floating bearing seat structure according to claim 8, characterized in that: The conductive bearing (5) and the bearing seat (6) are interference fit.
10. A motor, characterized in that: It comprises a motor floating bearing seat structure as described in any one of claims 1 to 9.