Conducting ring and oil-cooled motor
By using a conductive ring composed of a fixed ring and a rotating ring in the oil-cooled motor, and setting up a concave and convex and convex fitting portion therebetween, the problem of high oil resistance and cost of the conductive ring in the oil-cooled system is solved, and reliable conductive connection and long life are achieved.
Patent Information
- Application Number
- CN202411899157.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-04-25
AI Technical Summary
In oil-cooled motors, conductive rings need to have both good conductivity and oil resistance, but the prior art is costly and unstable when improving material performance, or the structure is complex and prone to failure.
The conductive ring composed of a fixed ring and a rotating ring is adopted. The fixed ring is fixed in the oil-cooled motor housing. The rotating ring rotates synchronously with the rotating shaft. By setting up a concave and convex fitting portion between the rotating ring and the fixed ring, multiple bent gaps are formed to hinder the flow of oil and maintain conductive connection.
The reliable conductive connection and oil-proof performance of the conductive ring are realized, which avoids oil affecting the operation of the conductive ring, reduces structural costs, and increases the life and reliability of the conductive ring.
Smart Images
Figure CN119891645A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of oil-cooled electric drive, and in particular to a conductive ring and an oil-cooled motor. Background Art
[0002] In oil-cooled motors, shaft current is usually generated because the shaft voltage of the motor exceeds the voltage that the oil film of the bearing grease can withstand, causing the oil film to be broken down, thereby forming a closed loop along the base, end cover, bearing and shaft. The current in this closed loop is the shaft current. The existence of shaft current will damage the bearings, shorten their service life, and may affect the performance and stability of the motor.
[0003] Conductive rings are effective devices for eliminating shaft currents and are widely used due to their high reliability, easy installation and low cost. However, with the development of the new energy industry, high-voltage, oil-cooled electric drive systems have become the general trend of electric drive development. As the system voltage continues to increase, more serious shaft current problems will arise, especially in oil-cooled systems. The thermal conductivity and electrical conductivity of the oil will affect the performance of the conductive ring. During the flow of oil, it is very easy to form an oil film attached to the metal surface, affecting the flow of shaft current, and may cause hazards such as bearing electrical corrosion.
[0004] Therefore, in addition to reliable electrical conductivity, the conductive ring also needs to be oil-proof. Most of the existing conductive rings are integrated with aluminum rings and conductive fiber bundles. In the oil cooling system, most of them use the method of improving the chemical stability of the conductive ring material to reduce the possibility of oil corrosion on the conductive ring, but this method will increase a lot of costs in the process of improving material performance, and there is still instability after the improvement, and there is a risk that the conductive ring cannot pierce the oil film or the conductive ring is affected by oil impurities; another method is to install a conductive ring and then install a skeleton oil seal, but this structure is more expensive, and the oil seal will rub against the shaft, which has the risk of failure. Summary of the invention
[0005] The purpose of the embodiments of the present application is to provide a conductive ring and an oil-cooled motor, which can effectively control the structural cost while achieving the oil-proof performance of the conductive ring.
[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:
[0007] In a first aspect, the present application provides a conductive ring, comprising: a fixed ring, used to be fixed in a housing of an oil-cooled motor, wherein the middle portion of the fixed ring has an axial hole adapted to a rotating shaft of the oil-cooled motor, the rotating shaft passes through the fixed ring and the two are electrically connected, and the axial hole is coaxially provided with a first inner cavity on a first axial side; and
[0008] A rotating ring, disposed in the first inner cavity and configured to rotate synchronously with the rotating shaft of the oil-cooled motor relative to the fixed ring;
[0009] There is at least one concave-convex matching portion between the outer circumferential surface of the rotating ring and the fixed ring, so that the gap between the fixed ring and the rotating ring forms multiple bends along the radial direction.
[0010] In some modified embodiments of the first aspect of the present application, a plurality of conductive fiber bundles are provided on the second side of the axial hole opposite to the first side in the axial direction, and the plurality of conductive fiber bundles are circumferentially spaced, and one end of the conductive fiber bundle is connected to the fixing ring, and the other end is used to contact the circumferential surface of the rotating shaft, so that the fixing ring and the rotating shaft are electrically conductive.
[0011] In some modified embodiments of the first aspect of the present application, a second inner cavity is coaxially opened on the second side of the axial hole, the multiple conductive fiber bundles are located in the second inner cavity, and the other end of the conductive fiber bundle extends into the interior of the axial hole.
[0012] In some modified implementations of the first aspect of the present application,
[0013] The outer peripheral surface of the rotating ring is provided with a plurality of annular protrusions, the plurality of annular protrusions are distributed at intervals along the axial direction of the rotating ring, and each of the annular protrusions circumferentially surrounds the rotating ring;
[0014] The cavity wall of the first inner cavity of the fixing ring is provided with an annular groove corresponding to and matching the plurality of annular protrusions;
[0015] The annular protrusion cooperates with the annular groove to form the concave-convex matching portion.
[0016] In some modified implementations of the first aspect of the present application,
[0017] The radial dimensions of the plurality of annular protrusions are equal; or,
[0018] The radial sizes of the plurality of annular protrusions gradually increase in a direction from the first side of the fixing ring to a second side opposite thereto in the axial direction.
[0019] In some modified embodiments of the first aspect of the present application, the annular protrusion includes: a first surface, a second surface and an arc surface, the first surface and the second surface are respectively connected to the outer circumferential surface of the rotating ring, and the arc surface is connected between the first surface and the second surface and is coaxial with the outer circumferential surface of the rotating ring.
[0020] In some modified implementations of the first aspect of the present application, the first surface is parallel to the second surface.
[0021] In some modified implementations of the first aspect of the present application, the angles formed by the first surface, the second surface and the arc surface are respectively less than 90 degrees.
[0022] In some modified implementations of the first aspect of the present application, the width of the gap between the fixed ring and the rotating ring is 0.2-0.3 mm.
[0023] A second aspect of the present application provides an oil-cooled motor, the oil-cooled motor comprising: a housing and a rotating shaft; and the above-mentioned conductive ring, which is arranged in the housing;
[0024] Wherein, the first side of the fixing ring of the conductive ring is a side close to the oil cooling space inside the shell.
[0025] Compared with the prior art, the conductive ring and the oil-cooled motor provided by the present application are composed of a fixed ring and a rotating ring. The fixed ring is fixed in the outer shell of the oil-cooled motor. The rotating ring is installed in the first inner cavity of the first side of the fixed ring, and the rotating ring and the rotating shaft can be connected to realize synchronous rotation of the rotating ring and the rotating shaft relative to the fixed ring; by providing at least one concave-convex matching portion between the outer circumferential surface of the rotating ring and the cavity wall of the first inner cavity of the fixed ring, so that the gap between the fixed ring and the rotating ring forms multiple bends in the radial direction, so that when the oil flows into the gap between the fixed ring and the rotating ring, the bends formed by the concave-convex matching portions can hinder the flow rate of the oil, and at the same time, the friction generated by the viscosity of the oil and the friction generated by the gap can be used to further slow down the flow rate of the oil and reduce the flow rate, so that the oil can finally not pass through the gap, thereby providing a closed space for the second side away from the oil, so that the fixed ring and the rotating shaft always maintain a reliable conductive connection, realize the conduction of the shaft current, ensure that it is not affected by the oil, and further increase the cost, and will not generate friction with the rotating shaft, greatly increasing the life and reliability of the conductive ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:
[0027] Figure 1 The schematic diagram of the structure of the conductive ring provided by the embodiment of the present invention is schematically shown;
[0028] Figure 2 The schematic diagram of the structure of the conductive ring provided by the embodiment of the present invention is schematically shown at another angle;
[0029] Figure 3 The structure diagram of the fixing ring of the conductive ring provided by the embodiment of the present invention is schematically shown;
[0030] Figure 4 The structure diagram of the rotating ring of the conductive ring provided by the embodiment of the present invention is schematically shown;
[0031] Figure 5 The cross-sectional structure diagram of the conductive ring provided by the embodiment of the present invention is schematically shown;
[0032] Description of Figure Numbers:
[0033] 1. Fixed ring; 101. First inner cavity; 102. Second inner cavity; 103. Annular groove; 2. Rotating ring; 21. Annular protrusion; 3. Conductive fiber bundle; 4. Rotating shaft; 5. Shell. DETAILED DESCRIPTION
[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.
[0036] Shaft current is the key factor causing electrical corrosion of bearings. How to control shaft current is the key to preventing electrical corrosion of bearings, and the conductive ring is an effective device to eliminate shaft current. In the oil cooling system, the conductive ring needs not only reliable electrical conductivity but also oil resistance to resist the influence of thermal conductivity and electrical conductivity of oil on the performance of the conductive ring.
[0037] Most of the existing conductive rings are integrations of aluminum rings and conductive fiber bundles. In order to meet the conductive and oil-proof properties of the conductive rings, at present, most of the methods used are to improve the chemical stability of the conductive ring material to reduce the possibility of oil corrosion on the conductive ring. However, this method will increase a lot of costs in the process of improving material performance, and there is still instability after the improvement, and there is a risk that the conductive ring cannot pierce the oil film or the conductive ring is affected by oil impurities. Another method is to install a skeleton oil seal on the basis of installing the conductive ring, but this structure is more expensive, and the skeleton oil seal will produce friction with the rotating shaft, and there is a risk of failure.
[0038] Embodiment 1
[0039] Reference Figure 1 -Attached Figure 5In order to solve the above problems, a first embodiment of the present invention proposes a conductive ring, which comprises: a fixed ring 1, which is used to be fixed in a housing 5 of an oil-cooled motor, wherein the middle part of the fixed ring 1 has an axial hole adapted to the rotating shaft 4 of the oil-cooled motor, the rotating shaft 4 passes through the fixed ring 1 and the two are electrically conductive, and the axial hole coaxially opens a first inner cavity 101 on the first side of the axial direction; and a rotating ring 2, which is arranged in the first inner cavity 101 and is used to rotate synchronously with the rotating shaft 4 of the oil-cooled motor relative to the fixed ring 1; wherein, the outer circumferential surface of the rotating ring 2 and the fixed ring 1 have at least one concave-convex matching portion, so that the gap between the fixed ring 1 and the rotating ring 2 forms multiple bends in the radial direction.
[0040] Specifically, the conductive ring provided in this embodiment is applied to an oil-cooled motor, and the conductive ring is mainly composed of a fixed ring 1 and a rotating ring 2, wherein the fixed ring 1 is fixed in the housing of the oil-cooled motor, and can be specifically located on the outside of the bearing, and the middle part of the fixed ring 1 has an axial hole adapted to the rotating shaft 4 of the oil-cooled motor, and the rotating shaft 4 can pass through the axial hole of the fixed ring 1, and the rotating shaft 4 and the fixed ring 1 maintain electrical conduction; in order to achieve the installation of the rotating ring 2, a first inner cavity 101 is opened on the first side of the axial hole of the fixed ring 1, and the first inner cavity 101 is an annular cavity that is coaxial with the axial hole and can surround the rotating shaft 4, and the first inner cavity 101 is adapted to the rotating ring 2 so that the rotating ring 2 can be installed in the first inner cavity 101, and through the connection between the rotating ring 2 and the rotating shaft 4, the rotating ring 2 and the rotating shaft 4 can be synchronously rotated relative to the fixed ring 1.
[0041] In order to make the conductive ring have good oil-proof performance, the first side of the shaft hole in the axial direction can be a side close to the oil cooling space of the shell 5, that is, a side close to the oil, and the second side of the fixed ring 1 opposite to the first side in the axial direction always maintains a conductive relationship with the rotating shaft 4, and further, at least one concave-convex matching portion is provided between the outer peripheral surface of the rotating ring 2 and the wall of the first inner cavity 101 of the fixed ring 1, that is, the matching is carried out through the concave-convex structure, and the relative rotation of the rotating ring 2 and the fixed ring 1 is not affected, so that the gap between the fixed ring 1 and the rotating ring 2 forms multiple bends in the radial direction, as shown in the attached Figure 5 As shown, such an arrangement, compared with the gap between the fixed ring 1 and the rotating ring 2 extending in a straight line, can hinder the flow rate of the oil through the bend formed by the concave-convex matching part when the oil flows into the gap between the fixed ring 1 and the rotating ring 2. At the same time, the friction generated by the viscosity of the oil and the friction generated by the gap can further slow down the flow rate of the oil, reduce the flow rate, and finally make it impossible for the oil to pass through the gap, thereby providing a closed space for the second side away from the oil, so that the fixed ring 1 and the rotating shaft 4 always maintain a reliable conductive connection, realize the conduction of the shaft current, and ensure that it is not affected by the oil.
[0042] Among them, since there is a gap between the fixed ring 1 and the rotating ring 2, the friction between the two can be reduced, and in order to prevent the oil from flowing from the gap to the second side of the fixed ring 1, the width of the gap can be limited. For example, the width of the gap between the fixed ring 1 and the rotating ring 2 can be set to 0.2-0.3mm. In this way, it can not only play a role in hindering and limiting the flow of oil together with the concave and convex matching parts, but also will not cause friction between the fixed ring 1 and the rotating ring 2, which can improve the reliability of the conductive ring.
[0043] According to the above, an embodiment of the present invention proposes a conductive ring, which is composed of a fixed ring 1 and a rotating ring 2. The fixed ring 1 is fixed in the housing of the oil-cooled motor. The rotating ring 2 is installed in the first inner cavity 101 of the fixed ring 1 on the first side, and the rotating ring 2 is connected to the rotating shaft 4 so that the rotating ring 2 and the rotating shaft 4 can be synchronously rotated relative to the fixed ring 1; at least one concave-convex matching portion is provided between the outer circumferential surface of the rotating ring 2 and the cavity wall of the first inner cavity 101 of the fixed ring 1, so that the gap between the fixed ring 1 and the rotating ring 2 forms multiple bends in the radial direction, so that the oil can be moved in the direction of the rotating ring 2. When the oil flows in the gap between the fixed ring 1 and the rotating ring 2, the bend formed by the concave-convex matching part can hinder the flow rate of the oil. At the same time, the friction generated by the viscosity of the oil and the friction generated by the gap can further slow down the flow rate of the oil and reduce the flow rate, ultimately making it impossible for the oil to pass through the gap, thereby providing a closed space for the second side away from the oil, so that the fixed ring 1 and the rotating shaft 4 always maintain a reliable conductive connection, realize the conduction of the shaft current, ensure that it is not affected by the oil, and further increase the cost. It will not generate friction with the rotating shaft 4, greatly increasing the life and reliability of the conductive ring.
[0044] For further information, see Attachment Figure 1 and attached Figure 2 In a specific implementation, a plurality of conductive fiber bundles 3 are provided on the second side of the axial hole opposite to the first side in the axial direction. The plurality of conductive fiber bundles 3 are circumferentially spaced, and one end of the conductive fiber bundle 3 is connected to the fixing ring 1, and the other end is used to contact the circumferential surface of the rotating shaft 4, so that the fixing ring 1 and the rotating shaft 4 are electrically conductive.
[0045] Specifically, in order to achieve a reliable conductive connection between the fixed ring 1 and the rotating shaft 4, in the technical solution adopted by the present invention, a plurality of conductive fiber bundles 3 can be arranged on the second side of the axial hole of the fixed ring 1 opposite to the first side in the axial direction. The plurality of conductive fiber bundles 3 can be spaced and evenly distributed along the circumference of the axial hole. One end of each conductive fiber is connected to the fixed ring 1, and the other end always maintains a contact relationship with the circumferential surface of the rotating shaft 4, thereby achieving a reliable conductive connection between the fixed ring 1 and the rotating shaft 4; when the rotating shaft 4 rotates and accumulates excess charge, the end of the conductive fiber bundle 3 in contact with the rotating shaft 4 can connect the excess charge from the fixed ring 1 to the housing 5 of the oil-cooled motor, and lead it to the ground.
[0046] The conductive fiber bundle 3 may be metal conductive fiber, or may be carbon conductive fiber, etc. The material of the conductive fiber bundle 3 may be selected according to the application environment of the oil-cooled motor, and is not specifically limited here.
[0047] For further information, see Attachment Figure 1 To Attachment Figure 3 In a specific implementation, a second inner cavity 102 is coaxially opened on the second side of the axial hole, the plurality of conductive fiber bundles 3 are located in the second inner cavity 102, and the other end of the conductive fiber bundle extends into the interior of the axial hole.
[0048] Specifically, in order to improve the reliability of the contact between the conductive fiber bundle 3 and the rotating shaft 4, in the technical solution adopted by the present invention, a second inner cavity 102 can be coaxially opened on the second side of the axial hole, and the second cavity is arranged around the rotating shaft 4. The diameter of the second cavity can be set to be smaller than the diameter of the first cavity. Multiple conductive fiber bundles 3 are located in the second inner cavity 102, one end of the conductive fiber bundle 3 can be fixed to multiple fixing holes opened in the second cavity, and the other end can be extended to a position inserted into the axial hole. The setting of the second inner cavity 102 can allow the conductive fiber bundle 3 to have a certain movable space, and the conductive fiber bundle 3 can maintain a conductive relationship of full contact with the rotating shaft 4 when inserted into the axial hole.
[0049] Among them, refer to the attached Figure 5 The part of the axial hole of the fixed ring 1 located between the first inner cavity 101 and the second inner cavity 102 can maintain a certain gap with the rotating shaft 4, and the width of the gap can be equal to the width of the gap between the fixed ring 1 and the rotating ring 2 to avoid friction between the fixed ring 1 and the rotating shaft 4.
[0050] For further information, see Attachment Figure 3 -Attached Figure 5 In a specific implementation, a plurality of annular protrusions 21 are provided on the outer peripheral surface of the rotating ring 2, and the plurality of annular protrusions 21 are distributed at intervals along the axial direction of the rotating ring 2, and each of the annular protrusions 21 circumferentially surrounds the rotating ring 2; the cavity wall of the first inner cavity 101 of the fixed ring 1 is provided with annular grooves 103 corresponding to and adapted to the plurality of annular protrusions 21; the annular protrusions 21 cooperate with the annular grooves 103 to form the concave-convex matching portion.
[0051] Specifically, in order to cooperate with the rotating ring 2 and the fixed ring 1 through the concave-convex matching portion, in the technical solution adopted by the present invention, a plurality of annular protrusions 21 can be arranged on the outer circumferential surface of the rotating ring 2, and the number of the annular protrusions 21 can be set to 2-4, but not limited to this, the annular protrusions 21 are distributed at intervals along the axial direction of the rotating ring 2, and the spacing between any two adjacent annular protrusions 21 can be set equal, each of the annular protrusions 21 circumferentially surrounds the rotating ring 2 and is coaxial with the rotating ring 2; in coordination therewith, annular grooves 103 equal to the number of the annular protrusions 21 and corresponding one to one can be arranged on the cavity wall of the first inner cavity 101 of the fixed ring 1, and the annular grooves 103 are adapted to the annular protrusions 21 so that the annular protrusions 21 can be embedded in the annular grooves 103 to form the above-mentioned concave-convex matching portion.
[0052] The radial dimensions of each annular protrusion 21 can be set to be equal, as shown in the attached figure. Figure 5 As shown; or in order to further improve the oil resistance of the conductive ring, in the direction from the first side of the fixed ring 1 to the second side opposite thereto in the axial direction, the radial size of the annular protrusion 21 can be set to gradually increase, so that in the process of the oil flowing to the second side, the flow resistance can gradually increase, that is, the flow velocity also gradually decreases, and finally the oil cannot pass through the gap between the fixed ring 1 and the rotating ring 2.
[0053] For further information, see Attachment Figure 4 In a specific implementation, the annular protrusion 21 at least includes: a first surface, a second surface and an arc surface, the first surface and the second surface are respectively connected to the outer circumferential surface of the rotating ring 2, and the arc surface is connected between the first surface and the second surface and is coaxial with the outer circumferential surface of the rotating ring 2.
[0054] Specifically, there are many ways to set the specific shape of the annular protrusion 21, and the number of bends formed by different settings is also different. In the technical solution adopted by the present invention, the annular protrusion 21 includes: a first surface, a second surface and an arc surface. The first surface and the second surface are respectively connected to the outer peripheral surface of the rotating ring 2, and are respectively located on both sides of the arc surface in the axial direction. The arc surface is connected between the first surface and the second surface and is coaxial with the outer peripheral surface of the rotating ring 2. The cross-sectional shape of the annular protrusion 21 formed in this way is a quadrilateral. Each annular protrusion 21 can make the gap between the fixed ring 1 and the rotating ring 2 form four bends along the radial direction, which can effectively play an oil-blocking effect.
[0055] Among them, as attached Figure 4 As shown, the first surface is parallel to the second surface, so that the first surface and the second surface respectively form a 90-degree bend with the arc surface and the outer peripheral surface of the rotating ring 2, which can provide greater resistance to the flow of oil; or the angles formed by the first surface and the second surface and the arc surface are respectively less than 90 degrees, which can also provide greater resistance to the flow of oil.
[0056] Embodiment 2
[0057] Embodiment 2 of the present invention proposes an oil-cooled motor, which includes: a housing 5 and a rotating shaft 4; and a conductive ring as described above, which is arranged in the housing 5; wherein the first side of the fixing ring 1 of the conductive ring is a side close to the oil cooling space inside the housing 5.
[0058] Specifically, the oil-cooled motor provided in this embodiment adopts the above-mentioned conductive ring, the fixed ring 1 of the conductive ring is relatively fixed to the shell 5, and can be fixed to the outside of the bearing, the rotating ring 2 of the conductive ring is installed in the first inner cavity 101 of the fixed ring 1 on the first side, and can rotate synchronously with the rotating shaft 4 relative to the fixed ring 1; by providing at least one concave-convex matching portion between the outer circumferential surface of the rotating ring 2 and the cavity wall of the first inner cavity 101 of the fixed ring 1, so that the gap between the fixed ring 1 and the rotating ring 2 forms multiple bends in the radial direction, so that when the oil flows into the gap between the fixed ring 1 and the rotating ring 2, the flow rate of the oil can be hindered by the bends formed by the concave-convex matching portions, and at the same time, the friction generated by the viscosity of the oil and the friction generated by the gap can be used to further slow down the flow rate of the oil and reduce the flow rate, so that the oil can finally be unable to pass through the gap, thereby providing a closed space for the second side away from the oil, so that the fixed ring 1 and the rotating shaft 4 always maintain a reliable conductive connection, realize the conduction of the shaft current, and avoid the bearing from being affected by the shaft current corrosion.
[0059] It should be noted that in the description of this specification, the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as a limitation on the present invention; the terms "connect", "install", "fixed", etc. should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0060] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. 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 present invention. 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.
[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.
Claims
1. A conductive ring, characterized in that: include: A fixing ring (1) is used to be fixed in a housing (5) of an oil-cooled motor, wherein the fixing ring (1) has an axial hole in the middle thereof adapted to a rotating shaft (4) of the oil-cooled motor, the rotating shaft (4) passes through the fixing ring (1) and the two are electrically connected, and the axial hole is coaxially provided with a first inner cavity (101) on a first axial side; and A rotating ring (2) is arranged in the first inner cavity (101) and is used to rotate synchronously with the rotating shaft (4) of the oil-cooled motor relative to the fixed ring (1); There is at least one concave-convex matching portion between the outer circumferential surface of the rotating ring (2) and the fixed ring (1), so that the gap between the fixed ring (1) and the rotating ring (2) forms multiple bends in the radial direction.
2. The conductive ring according to claim 1, characterized in that: A plurality of conductive fiber bundles (3) are arranged on a second side of the axial hole opposite to the first side in the axial direction. The plurality of conductive fiber bundles (3) are circumferentially spaced and one end of the conductive fiber bundle (3) is connected to the fixing ring (1), and the other end is used to contact the circumferential surface of the rotating shaft (4), so that the fixing ring (1) and the rotating shaft (4) are electrically conductive.
3. The conductive ring according to claim 2, characterized in that: A second inner cavity (102) is coaxially opened on the second side of the axial hole, the plurality of conductive fiber bundles (3) are located in the second inner cavity (102), and the other end of the conductive fiber bundle extends into the interior of the axial hole.
4. The conductive ring according to claim 1, characterized in that: The outer peripheral surface of the rotating ring (2) is provided with a plurality of annular protrusions (21), the plurality of annular protrusions (21) are distributed at intervals along the axial direction of the rotating ring (2), and each of the annular protrusions (21) circumferentially surrounds the rotating ring (2); The cavity wall of the first inner cavity (101) of the fixing ring (1) is provided with an annular groove (103) corresponding to and matching the plurality of annular protrusions (21); The annular protrusion (21) cooperates with the annular groove (103) to form the concave-convex matching portion.
5. The conductive ring according to claim 4, characterized in that: The radial dimensions of the plurality of annular protrusions (21) are equal; or, In a direction from the first side of the fixing ring (1) to a second side opposite thereto in the axial direction, radial dimensions of the plurality of annular protrusions (21) gradually increase.
6. The conductive ring according to claim 4, characterized in that: The annular protrusion (21) comprises: a first surface, a second surface and an arc surface, the first surface and the second surface are respectively connected to the outer peripheral surface of the rotating ring (2), and the arc surface is connected between the first surface and the second surface and is coaxial with the outer peripheral surface of the rotating ring (2).
7. The conductive ring according to claim 6, characterized in that: The first surface is parallel to the second surface.
8. The conductive ring according to claim 6, characterized in that: An included angle formed by the first surface, the second surface and the arc surface is less than 90 degrees respectively.
9. The conductive ring according to claim 1, characterized in that: The width of the gap between the fixed ring (1) and the rotating ring (2) is 0.2-0.3 mm.
10. An oil-cooled motor, characterized in that: include: A housing (5) and a rotating shaft (4); and The conductive ring as claimed in any one of claims 1 to 9, arranged in the housing (5); in, The first side of the fixing ring (1) of the conductive ring is a side close to the oil cooling space inside the shell (5).