A bearing installation structure and motor thereof

Abstract

The utility model relates to a bearing installation structure and a motor thereof, including an end cover, a bearing chamber constructed on the end cover, an insert adapted to be embedded on the bearing chamber, an assembly groove for matching the bearing installation constructed on the insert; a wave spring is provided at the bottom of the assembly groove at the periphery of the through hole, the wave crest of the wave spring abuts against the inner end face of the bearing so as to form an axial gap between the wave spring and the bearing, a connecting hole is axially opened at the bottom of the assembly groove between the through hole and the wave spring, a conductive column is fixedly provided on the connecting hole, a plurality of conductive wires extending into the axial gap are integrated on the conductive column, and the plurality of conductive wires abut against the inner end face of the bearing. In the above scheme, the conductive column integrated with flexible wear-resistant conductive wires is installed at the bottom of the assembly groove, the conductive wires extend into the axial gap and abut against the inner end face of the bearing, which effectively solves the problem of electrochemical corrosion of the bearing, reduces the axial installation size of the motor, and saves costs.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a bearing installation structure and a motor thereof. Background Art

[0002] When the rotor assembly in the motor of new energy vehicles rotates at high speed, induced current and electric potential are generated. Before conductive measures are taken, there will be electrochemical corrosion problems of bearings in the circuit loop system.

[0003] At present, in order to solve the problem of electrochemical corrosion of bearings, optimization measures such as double insulation "front / rear ceramic ball bearings", front conduction and rear insulation "front deep groove ball bearing + conductive brush / conductive oil seal + rear ceramic ball bearing" are adopted. These measures may have problems: first, the parts cost of ceramic ball bearings and brushes is relatively high; second, the installation space of the brush causes the axial dimension L to be lengthened, resulting in increased cost of the shaft and housing.

[0004] In addition, after the wave spring & end cover are combined in the new energy vehicle motor, the "wave spring & end cover combination" is installed as a reverse blind installation and inverted on the rotor assembly. Under extreme working conditions, if the axial movement of the motor is abnormal or too large, the wave spring will be flattened and cause plastic deformation and be unable to rebound, resulting in failure of the preload function.

[0005] In the motor of new energy vehicles, the hole clearance of the bearing and the active end insert is matched, and there is some wave spring rotation in the bearing running circle failure mode, which accelerates the wear of the wave spring and the bearing chamber insert. Summary of the invention

[0006] In order to solve the above problems, the first purpose of the utility model is to provide a bearing mounting structure, which can solve the problem of electrochemical corrosion of the bearing and reduce the installation volume of the motor shaft and the housing; and can also prevent the wave spring from being compressed and unable to rebound; in addition, it can also prevent the wave spring from rotating and avoiding its wear; the second purpose of the utility model is to provide a motor having the above-mentioned bearing mounting structure.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A bearing mounting structure comprises an end cover, on which a bearing chamber is constructed, and is characterized in that: an insert is adapted to be embedded in the bearing chamber, an assembly groove for matching the bearing installation is constructed on the insert, and a through hole matching the motor shaft is provided at the bottom of the assembly groove; a wave spring is provided at the bottom of the assembly groove at the periphery of the through hole, and the wave crest of the wave spring abuts against the inner end surface of the bearing to form an axial gap between the wave spring and the bearing, a connecting hole is axially provided at the bottom of the assembly groove between the through hole and the wave spring, a conductive column is fixedly provided on the connecting hole, and a plurality of conductive wires extending into the axial gap are integrated on the conductive column, and the plurality of conductive wires abut against the inner end surface of the bearing.

[0009] In the above technical solution, an insert is installed in the bearing chamber, and the bearing and the wave spring are installed in the assembly groove of the insert. Based on the structural characteristics of the wave spring, an axial gap is formed between the inner end face of the bearing and the wave spring, and a conductive column integrated with a flexible wear-resistant conductive wire is installed at the bottom of the assembly groove. The conductive wire extends into the axial gap and abuts against the inner end face of the bearing. Therefore, the current can be led out along the motor shaft, bearing, conductive wire, conductive column, insert to the end cover in sequence, thereby effectively solving the problem of electrochemical corrosion of the bearing, and the structure is simple and the cost is low. In addition, unlike the existing brushes installed outside the bearing chamber, which leads to the lengthening of the axial dimension L and the increase in the cost of the shaft and the housing, the above solution installs the integrated conductive column and conductive wire in the bearing chamber, which can effectively reduce the axial installation size of the motor, improve space utilization, and save costs. It should be noted here that the insert is made of steel material with good conductivity.

[0010] Preferably, there are multiple connection holes regularly arranged in the circumferential direction, and there are multiple conductive columns correspondingly arranged, and the conductive wires on the multiple conductive columns abut against the inner end surface of the bearing. In this technical solution, there are multiple connection holes evenly distributed corresponding to the multiple conductive columns, and the conductive wires on each conductive column abut against the inner end surface of the bearing, which can effectively lead out the current on the bearing. It should be noted here that there are six conductive columns in this case, and the number of their arrangement can be calculated and confirmed according to the size of the induced current and the bearing area of ​​the conductive cylinder.

[0011] Preferably, the connection hole is a threaded hole, an internal thread is provided in the threaded hole, and an external thread matching the internal thread is provided at the lower part of the conductive column. In this technical solution, the connection hole is a threaded hole, and the outside of the conductive column has an external thread matching the internal thread, which improves the connection strength between the conductive column and the connection hole and greatly improves the assembly stability of the conductive column and the insert.

[0012] Preferably, the bottom of the assembly groove extends axially between the connecting hole and the wave spring to form a plurality of bosses, and the height of the bosses is greater than the thickness of the wave spring. In this technical solution, a boss of a certain height is set at the bottom of the assembly groove. In some extreme working conditions, the boss can abut against the inner end face of the bearing to prevent the wave spring from being axially flattened and entering the plastic deformation range and being unable to rebound, resulting in its failure. It should be noted here that the height of the boss can refer to JB / T13296 and the stress limit calculation test height.

[0013] Preferably, the boss is arc-shaped, and multiple bosses are regularly arranged circumferentially and adapted to multiple wave crests of the wave spring. In this technical solution, the boss is arc-shaped, and each boss corresponds to a wave crest. When the wave crest is abnormally flattened, it contacts the inner ring of the bearing, transmits the motor shaft shoulder with the inner ring, improves the force contact surface between the boss and the bearing, and protects the wave spring wave and the bearing. It should be noted here that the width of the boss is XφD, and the size is designed with reference to the size of the inner ring of the bearing.

[0014] Preferably, a bayonet is formed between adjacent bosses, a trough is formed between adjacent wave crests on the wave spring, and the trough extends toward the axis to form a flange, and the flange is in the bayonet. In this technical solution, the flange on the wave spring cooperates with the bayonet to effectively prevent the wave spring from rotating, play a limiting role, and prevent the risk of wear of the wave spring due to the rotation of the bearing ring, thereby optimizing the problem and reducing the D-FMEA failure mode severity S score.

[0015] A motor comprises a bearing mounting structure as described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the side structure of a bearing mounting structure.

[0017] Figure 2 for Figure 1 AA cross-section diagram

[0018] Figure 3 It is a three-dimensional structural schematic diagram of a bearing mounting structure.

[0019] Figure 4 Schematic diagram of the layout of the bearing chamber on the end cover.

[0020] Figure 5 It is the assembly diagram of insert and bearing chamber.

[0021] Figure 6 It is a schematic diagram of the assembly of the insert, wave spring and conductive column.

[0022] Figure 7 A schematic diagram of the three-dimensional structure of the insert.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the wave spring.

[0024] Fig. 9 Schematic diagram of the assembly of conductive pillars and conductive wires. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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:

[0030] like Figures 1 to 9 A bearing mounting structure shown in the figure comprises an end cover 1, a bearing chamber 2 is constructed on the end cover 1, an insert 3 is adapted to be embedded in the bearing chamber 2, an assembly groove 5 for fitting the bearing 4 is constructed on the insert 3, a through hole 7 for fitting with the motor shaft 6 is provided at the bottom of the assembly groove 5; a wave spring 8 is provided at the bottom of the assembly groove 5 on the periphery of the through hole 7, a wave crest 100 of the wave spring 8 abuts against the inner end surface of the bearing 4 so as to form an axial gap between the wave spring 8 and the bearing 4, a connecting hole 9 is axially provided at the bottom of the assembly groove 5 between the through hole 7 and the wave spring 8, a conductive column 10 is fixedly provided on the connecting hole 9, a plurality of conductive wires 11 extending into the axial gap are integrated on the conductive column 10, and the plurality of conductive wires 11 abut against the inner end surface of the bearing 4.

[0031] In the above technical solution, an insert is installed in the bearing chamber, and the bearing and the wave spring are installed in the assembly groove of the insert. Based on the structural characteristics of the wave spring, an axial gap is formed between the inner end surface of the bearing and the wave spring. A conductive column with integrated flexible wear-resistant conductive wire is installed at the bottom of the assembly groove, and the conductive wire extends into the axial gap and abuts against the inner end surface of the bearing. Therefore, Figure 2 As shown, the current can be led out along the motor shaft, bearing, conductive wire, conductive column, insert to the end cover in sequence, thereby effectively solving the problem of electrochemical corrosion of the bearing, and the structure is simple and the cost is low. In addition, unlike the existing brush installation outside the bearing chamber, which leads to the lengthening of the axial dimension L and the increase in the cost of the shaft and housing, the above solution installs the integrated conductive column and conductive wire in the bearing chamber, which can effectively reduce the axial installation size of the motor, improve space utilization, and save costs. It should be noted here that the insert is made of steel material with good conductivity.

[0032] Furthermore, there are a plurality of connection holes 9 regularly arranged in the circumferential direction, and a plurality of conductive posts 10 are correspondingly arranged, and the conductive wires 11 on the plurality of conductive posts 10 abut against the inner end surface of the bearing 4. In this technical solution, the connection holes are evenly distributed with a plurality of corresponding conductive posts, and the conductive wires on each conductive post abut against the inner end surface of the bearing, which can effectively lead out the current on the bearing. It should be noted here that in this case, six conductive posts are arranged, and the number of arranged posts can be calculated and confirmed according to the size of the induced current and the bearing area of ​​the conductive cylinder.

[0033] Furthermore, the connection hole 9 is a threaded hole, and an internal thread 12 is provided in the threaded hole, and an external thread 13 matching with the internal thread 12 is provided at the lower part of the conductive column 10. In this technical solution, the connection hole is a threaded hole, and the outside of the conductive column has an external thread matching with the internal thread 12, which improves the connection strength between the conductive column and the connection hole and greatly improves the assembly stability of the conductive column and the insert.

[0034] Furthermore, the bottom of the assembly groove 5 axially extends between the connecting hole 9 and the wave spring 8 to form a plurality of bosses 14, and the height of the bosses 14 is greater than the thickness of the wave spring 8. In this technical solution, a boss of a certain height is set at the bottom of the assembly groove. In some extreme working conditions, the boss can abut against the inner end face of the bearing to prevent the wave spring from being axially flattened and entering the plastic deformation range and being unable to rebound, resulting in its failure. It should be noted here that the height of the boss can refer to JB / T13296 and the stress limit calculation test height.

[0035] Furthermore, the boss 14 is arc-shaped, and multiple bosses 14 are regularly arranged in the circumferential direction and are adapted to correspond to multiple wave crest sections 101 of the wave spring 8. In this technical solution, the boss is arc-shaped, and each boss corresponds to a wave crest section. When the wave crest section is abnormally flattened, it contacts the inner ring of the bearing, transmits the motor shaft shoulder with the inner ring, improves the force contact surface between the boss and the bearing, and protects the wave spring wave and the bearing. It should be noted here that the width of the boss is XφD, and the size is designed with reference to the size of the inner ring of the bearing.

[0036] Furthermore, a bayonet 15 is formed between adjacent bosses 14, a trough 200 is formed between adjacent peak sections 101 on the wave spring 8, and the trough 200 extends toward the axis to form a flange 16, and the flange 16 is located in the bayonet 15. In this technical solution, the flange on the wave spring cooperates with the bayonet to effectively prevent the wave spring from rotating, play a limiting role, and prevent the risk of wear of the wave spring due to the rotation of the bearing ring, thereby optimizing the problem and reducing the D-FMEA failure mode severity S score. Embodiment 2:

[0037] A motor includes a bearing mounting structure in the first embodiment.

[0038] In this specific embodiment, in order to solve the existing problem of electrochemical corrosion of bearings, the cost of parts such as brushes is high, and the axial dimension L is lengthened due to the installation space of the brushes, which leads to the increase in the cost of the shaft and the housing, the above scheme effectively solves the problem of electrochemical corrosion of bearings by installing an insert in the bearing chamber, installing a conductive column and a conductive wire at the bottom of the insert, and the conductive wire cooperates with the inner end face of the bearing, thereby effectively reducing the axial installation size of the motor, improving space utilization, and saving costs. In addition, a boss is provided at the bottom of the assembly groove of the insert to effectively prevent the wave spring from being flattened and causing plastic deformation and being unable to rebound, resulting in the failure of the preload function. In addition, a bayonet fit limiter is provided between the flange and the adjacent boss on the wave spring to prevent the wave spring from rotating with the rotation, thereby accelerating the wear of the wave spring and the bearing chamber insert.

[0039] 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.

[0040] 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 bearing mounting structure, comprising an end cover (1), a bearing chamber (2) being constructed on the end cover (1), characterized in that: The bearing chamber (2) is provided with an insert (3) adapted to be embedded therein, the insert (3) being provided with an assembly groove (5) for fitting the bearing (4), the bottom of the assembly groove (5) being provided with a through hole (7) for fitting with the motor shaft (6); a wave spring (8) being provided at the bottom of the assembly groove (5) on the periphery of the through hole (7), the wave crest (100) of the wave spring (8) abutting against the inner end surface of the bearing (4) so ​​as to form an axial gap between the wave spring (8) and the bearing (4), the bottom of the assembly groove (5) being provided with a connecting hole (9) axially between the through hole (7) and the wave spring (8), a conductive column (10) being fixedly provided on the connecting hole (9), a plurality of conductive wires (11) being integrated on the conductive column (10) and extending into the axial gap, the plurality of conductive wires (11) abutting against the inner end surface of the bearing (4).

2. A bearing mounting structure according to claim 1, characterized in that: A plurality of the connection holes (9) are regularly arranged in the circumferential direction, and a plurality of conductive pillars (10) are correspondingly provided, and the conductive wires (11) on the plurality of conductive pillars (10) abut against the inner end surface of the bearing (4).

3. A bearing mounting structure according to claim 1, characterized in that: The connection hole (9) is a threaded hole, an internal thread (12) is provided in the threaded hole, and an external thread (13) matching the internal thread (12) is provided at the lower part of the conductive column (10).

4. A bearing mounting structure according to claim 1, characterized in that: The bottom of the assembly groove (5) extends axially between the connection hole (9) and the wave spring (8) to form a plurality of bosses (14), wherein the height of the bosses (14) is greater than the thickness of the wave spring (8).

5. A bearing mounting structure according to claim 4, characterized in that: The boss (14) is arc-shaped, and a plurality of bosses (14) are regularly arranged in the circumferential direction and are adaptively matched with a plurality of wave peak sections (101) of the wave spring (8).

6. A bearing mounting structure according to claim 5, characterized in that: A bayonet (15) is formed between adjacent bosses (14), a trough (200) is formed between adjacent wave crest sections (101) on the wave spring (8), and the trough (200) extends toward the axis to form a flange (16), and the flange (16) is located in the bayonet (15).

7. A motor, characterized in that: It comprises a bearing mounting structure as described in any one of claims 1 to 6.

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