Motor shaft current elimination mechanism and motor
By installing insulated bearings and conductive rings on the motor shaft, the shaft current is directed to the gearbox housing, solving the problem of electro-corrosion caused by shaft current in the motor bearings, thus extending bearing life and improving motor stability.
Patent Information
- Application Number
- CN202422856584.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-21
AI Technical Summary
During motor operation, shaft current can cause bearing electro-corrosion, affecting bearing life and increasing maintenance costs.
An insulated bearing is installed on the motor shaft, and a conductive ring is connected between the front end of the motor shaft and the adapter shaft to guide the shaft current to the gearbox housing. The current is then transmitted to the gearbox housing through the conductive ring and the adapter shaft, thus preventing the shaft current from damaging the bearing.
It effectively eliminates shaft current, prevents bearing electro-corrosion, extends bearing service life, improves motor operation stability and reliability, and saves space and cost.
Smart Images
Figure CN223583991U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor manufacturing technical field, especially a kind of motor shaft current elimination mechanism and motor. BACKGROUND
[0002] New energy automobile in motor operation process, due to electromagnetic unbalance, power supply current harmonic, electrostatic effect, external power supply interference and so on reason can make motor stator and motor rotor between shaft voltage, shaft voltage forms loop through motor bearing, produces shaft current.If there is the existence of shaft current, it can lead to motor bearing inner and outer ring raceway leave electric corrosion line, not only lead to bearing temperature rise, and the operation noise of motor can increase, to reduce the service life of bearing and motor, increase the maintenance cost of entire motor.
[0003] Therefore, it is urgent to design a kind of motor shaft current elimination mechanism to reduce or eliminate shaft current, to guarantee the normal operation life of bearing and motor. UTILITY MODEL CONTENT
[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide a kind of motor shaft current elimination mechanism and motor, to solve the technical problem that motor bearing is affected by the service life of motor bearing due to the bearing electric corrosion caused by shaft current in prior art.
[0005] To achieve the above-mentioned purposes and other related purposes, the technical scheme of the utility model is as follows:
[0006] A kind of motor shaft current elimination mechanism, comprising:
[0007] Motor shaft, the front end of the motor shaft is rotatably connected with reduction box shell, the front end of the motor shaft is provided with installation cavity, the rear end of the motor shaft is provided with insulating bearing;
[0008] Adapter shaft, connected to the reduction box shell, and extend to the inside of the installation cavity;
[0009] Conductive ring, located in the installation cavity, and connected between the adapter shaft and the motor shaft, so that the shaft current on the motor shaft is transmitted to the reduction box shell through the conductive ring and adapter shaft.
[0010] Optionally, the conductive ring is fixedly provided on the adapter shaft, and the outer periphery of the conductive ring is in contact with the inner wall of the installation cavity of the motor shaft.
[0011] Optionally, the conductive ring comprises a ring body portion and a plurality of conductive brushes arranged on the ring body portion in the circumferential direction, the fixed end of the conductive brush is connected to the ring body portion, and the free end of the conductive brush extends outward along the radial direction of the ring body portion.
[0012] Optionally, the inner diameter of the ring body is in interference fit with the outer diameter of the adapter shaft, and the conductive brush is in abutment with the inner wall of the mounting cavity.
[0013] Optionally, the conductive brush is a bundle of conductive fibers.
[0014] Optionally, the adapter shaft is detachably connected with the reduction box shell, the reduction box shell is provided with a first connecting part on the side facing the adapter shaft, the adapter shaft is provided with a second connecting part, and the second connecting part is adapted to the first connecting part; or the adapter shaft is integrally formed with the reduction box shell.
[0015] Optionally, the oil guide plate is further provided, the oil guide plate is clamped in the mounting cavity and located at the rear end of the adapter shaft, the outer circumferential wall of the oil guide plate is in abutment with the inner wall of the mounting cavity, the oil guide plate is provided with a limiting hole, and the outer diameter of the rear end of the adapter shaft is adapted to the inner diameter of the limiting hole.
[0016] Optionally, the oil guide plate is provided in a planar structure; or the oil guide plate is provided with an annular flange in abutment with the inner wall of the mounting cavity, the annular flange extends towards the conductive ring or towards the end of the motor shaft, and the outer diameter of the annular flange is in interference fit with the inner diameter of the mounting cavity.
[0017] Optionally, the first support bearing and the second support bearing are further provided, the first support bearing is arranged between the front end of the motor shaft and the reduction box shell, and the second support bearing is sleeved on the motor shaft and located between the first support bearing and the insulating bearing.
[0018] Based on the same concept, the utility model also provides a motor, which comprises the motor shaft current elimination mechanism.
[0019] As described above, the motor shaft current elimination mechanism and the motor have the following beneficial effects:
[0020] By arranging the insulating bearing at the end of the motor shaft, the damage of the shaft current to the motor bearing can be prevented; by arranging the conductive ring connected with the adapter shaft and the motor shaft at the front end of the motor shaft, the shaft current on the motor shaft can be guided out, so that the bearing electric corrosion caused by the shaft current can be avoided, the motor bearing is protected from damage, and the service life of the bearing is increased.
[0021] Further, by arranging the oil guide plate, the deformation of the conductive ring caused by the impact of a large amount of lubricating oil can be avoided, and better shaft current conduction effect can be ensured. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 FIG. 1 is a structural schematic view of a motor shaft current elimination mechanism according to an embodiment of the utility model;
[0023] Figure 2 Structure diagram of the conductive ring according to an embodiment of the present application;
[0024] Figure 3 Structure diagram of the motor shaft current elimination mechanism according to another embodiment of the present application;
[0025] Figure 4 Structure diagram of the motor shaft current elimination mechanism according to still another embodiment of the present application.
[0026] Explanation of reference numerals
[0027] 1 - speed reducer box shell; 11 - first connecting part;
[0028] 2 - motor shaft; 21 - mounting cavity;
[0029] 3 - insulating bearing;
[0030] 4 - adapter shaft; 41 - second connecting part;
[0031] 5 - conductive ring; 51 - ring body part; 52 - conductive brush;
[0032] 6 - oil guide plate; 61 - limiting hole; 62 - annular flange;
[0033] 7 - first supporting bearing
[0034] 8 - second supporting bearing. DETAILED DESCRIPTION
[0035] The implementation manners of the present application are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. The present application can also be implemented or applied by different specific embodiments, and each detail in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.
[0036] It needs to be explained that the diagram provided in the embodiment only illustrates the basic concept of the utility model in a schematic manner, and only shows the components related to the utility model in the diagram, not drawn according to the component number, shape and size in actual implementation. The shape, number and proportion of each component in actual implementation can be changed at will, and the component layout form can be more complex. It is understood that the structure, proportion, size and the like shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the utility model. Therefore, it does not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the utility model can produce, should still fall within the scope covered by the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, not for limiting the scope of the utility model. The change or adjustment of relative relationship is also considered as the scope of the utility model.
[0037] In order to describe the utility model in detail, the motor shaft current elimination mechanism of the utility model will be described in detail as follows:
[0038] Please refer to Figure 1 The utility model provides a motor shaft current elimination mechanism, which comprises a motor shaft 2, an adapter shaft 4 and a conductive ring 5. The front end of the motor shaft 2 is rotatably connected to a reduction box shell 1. An installation cavity 21 is formed in the front end of the motor shaft 2. An insulating bearing 3 is arranged at the rear end of the motor shaft 2. The adapter shaft 4 is connected to the reduction box shell 1 and extends into the installation cavity 21. The conductive ring 5 is located in the installation cavity 21 and connected between the adapter shaft 4 and the motor shaft 2, so that the shaft current on the motor shaft 2 is transmitted to the reduction box shell 1 through the conductive ring 5 and the adapter shaft 4.
[0039] Specifically, the front end and the rear end of the motor shaft 2 are only for the convenience of showing one end and the other end of the motor shaft 2, and are not strictly limited to the front end and the rear end in the use process of the motor shaft 2. The insulating bearing 3 is sleeved on the rear end of the motor shaft 2, which can rely on the insulating bearing 3 to prevent the damage of shaft current to the motor side end bearing. The insulating bearing 3 can be in various forms, for example: ceramic ball bearing, insulating plating bearing, bearing chamber insulating bearing, bearing with ceramic coating on the inner / outer ring, or bearing with insulating treatment on the inner / outer ring, etc. The installation cavity 21 opened at the front end of the motor shaft 2 not only provides space for the installation of the conductive ring 5, but also ensures the stable connection between the conductive ring 5 and the motor shaft 2 and the adapter shaft 4. The adapter shaft 4 is connected to the reduction box shell 1 and extends into the installation cavity 21 of the motor shaft 2, which makes the conductive ring 5 be able to be conveniently connected between the motor shaft 2 and the adapter shaft 4. The setting of the adapter shaft 4 can ensure that the conductive ring 5 can stably transmit the shaft current to the reduction box shell 1, and at the same time will not interfere with the normal rotation of the motor shaft 2. The conductive ring 5 is arranged in the installation cavity 21 at the front end of the motor shaft 2, so as to discharge the shaft current on the motor shaft 2 to the reduction box shell 1 through the conductive ring 5 and the adapter shaft 4, thereby realizing the discharge of the shaft current on the motor shaft 2 and protecting the bearing from being damaged. By setting the insulating bearing 3 at the rear end of the motor shaft 2 to block the shaft current and setting the conductive ring 5 at the front end of the motor shaft 2 to discharge the shaft current, the "one block and one discharge" is realized, which ensures the effective elimination of the motor shaft 2 current, thereby preventing the damage of the shaft current to the motor and the connected components, avoiding the bearing electric corrosion caused by the shaft current, prolonging the service life of the bearing, and further improving the operation stability and reliability of the entire motor system; and, saving product space, strong assembly process, low cost, easy to maintain and check in daily operation.
[0040] In some embodiments, the conductive ring 5 is fixedly sleeved on the adapter shaft 4, and the outer periphery of the conductive ring 5 is in contact with the inner wall of the installation cavity 21 of the motor shaft 2. Specifically, the conductive ring 5 is fixedly sleeved on the adapter shaft 4 to ensure the stability and reliability of the conductive ring 5 during the operation of the motor, prevent loosening or falling off due to vibration or impact, and ensure good contact between the conductive ring 5 and the adapter shaft 4, thereby ensuring smooth transmission of the shaft current. The outer periphery of the conductive ring 5 is in contact with the inner wall of the installation cavity 21 of the motor shaft 2, which ensures the electrical contact between the conductive ring 5 and the motor shaft 2, so that the shaft current can be more effectively transmitted through the conductive ring 5. The contact between the conductive ring 5 and the inner wall of the installation cavity 21 ensures the transmission efficiency of the shaft current from the motor shaft 2 to the adapter shaft 4 and then to the reduction box shell 1.
[0041] Referring to Figure 2In the above embodiments, the conductive ring 5 includes a ring body part 51 and a plurality of conductive brushes 52 arranged circumferentially on the ring body part 51. The fixed end of the conductive brush 52 is connected to the ring body part 51, and the free end of the conductive brush 52 extends outward along the radial direction of the ring body part 51. Specifically, the ring body part 51 serves as the main structure of the conductive ring 5, providing stable support for the entire conductive ring 5. The plurality of conductive brushes 52 are evenly distributed along the circumference of the ring body part 51, allowing the conductive ring 5 to have a wider contact area in the radial direction, thereby improving the efficiency and stability of current transmission. The free end of the conductive brush 52 extends outward along the radial direction of the ring body part 51, allowing the conductive brush 52 to closely fit the inner wall of the mounting cavity 21 of the motor shaft 2, forming a better electrical contact. The free end of the conductive brush 52 has a certain elasticity and flexibility, which can adapt to the slight deformation or vibration of the motor shaft 2 during operation, ensuring that the conductive ring 5 and the motor shaft 2 always maintain good electrical contact, avoiding current transmission problems caused by poor contact.
[0042] It can be understood that the inner diameter of the ring body part 51 is in interference fit with the outer diameter of the adapter shaft 4, and the conductive brush 52 is in abutment with the inner wall of the mounting cavity 21. Among them, the inner diameter of the ring body part 51 is in interference fit with the outer diameter of the adapter shaft 4, which ensures that the ring body part 51 can tightly wrap around the adapter shaft 4 and is not easy to loosen or fall off, which helps to reduce displacement caused by vibration or impact, thereby ensuring the stability and reliability of the conductive ring 5 during motor operation. The conductive brush 52 is in abutment with the inner wall of the mounting cavity 21, enhancing the electrical contact between the conductive brush 52 and the inner wall of the mounting cavity 21. Through the elasticity and adaptability of the conductive brush 52, it can closely fit the inner wall of the mounting cavity 21, forming a continuous and stable electrical contact surface.
[0043] For example, the conductive brush 52 is a conductive fiber bundle. Specifically, the conductive fiber bundle can be, for example, a carbon fiber bundle, a metalized fiber bundle, etc., which is not limited here. The high conductivity of the conductive fiber bundle allows the shaft current to be smoothly transmitted to the ring body part 51 through the conductive brush 52. The carbon fiber bundle or metal fiber bundle has good wear resistance and durability, so that the conductive brush 52 is not easy to wear or damage during long-term use, thereby prolonging the service life of the conductive ring 5.
[0044] In some embodiments, the adapter shaft 4 is detachably connected to the reduction box housing 1, and the side of the reduction box housing 1 facing the adapter shaft 4 is provided with a first connecting part 11, and the adapter shaft 4 is provided with a second connecting part 41, and the second connecting part 41 is adapted to the first connecting part 11; or the adapter shaft 4 is integrally formed with the reduction box housing 1. Specifically, refer to Figure 1, the adapter shaft 4 is a separate component and is independently assembled on the reduction box shell 1. A first connecting portion 11 is arranged on the side of the reduction box shell 1 facing the adapter shaft 4, and a second connecting portion 41 is arranged at the front end of the adapter shaft 4. The second connecting portion 41 is inserted into the first connecting portion 11 to be connected, so that the adapter shaft 4 is connected with the reduction box shell 1. This design facilitates the installation, debugging, and subsequent maintenance and replacement of the adapter shaft 4, thereby reducing maintenance costs. Alternatively, referring to Figure 3 , the adapter shaft 4 is integrally formed with the reduction box shell 1, so that the overall structure is more reliable, the number of parts and assembly steps are reduced, the occupied space of the adapter shaft 4 is reduced, and the maintenance cost is reduced.
[0045] Referring to Figure 1 and Figure 3 , in the above embodiment, the motor shaft current elimination mechanism further comprises an oil guide plate 6, which is clamped in the mounting cavity 21 and located at the rear end of the adapter shaft 4. The outer peripheral side wall of the oil guide plate 6 abuts against the inner wall of the mounting cavity 21. The oil guide plate 6 has a limiting hole 61, and the outer diameter of the rear end of the adapter shaft 4 is adapted to the inner diameter of the limiting hole 61. Specifically, the oil guide plate 6 is clamped in the mounting cavity 21 and can rotate together with the motor shaft 2. The arrangement of the oil guide plate 6 can effectively limit the flow of lubricating oil, so that a large amount of lubricating oil can be prevented from entering the working area of the conductive ring 5, thereby achieving better conduction effect. That is, by arranging the oil guide plate 6, the flow of lubricating oil between the center of the reduction box shell 1 and the center of the motor shaft 2 can be prevented from being too large, so that the conductive ring 5 is not excessively impacted, thereby preventing the conductive ring 5 from being deformed too much and affecting the contact effect with the inner wall of the mounting cavity 21 of the motor shaft 2.
[0046] In the above embodiment, the oil guide plate 6 is arranged in a planar structure; or, an annular flange 62 abutting against the inner wall of the mounting cavity 21 is arranged on the oil guide plate 6. The annular flange 62 extends towards the conductive ring 5 or towards the end of the motor shaft 2, and the outer diameter of the annular flange 62 is in interference fit with the inner diameter of the mounting cavity 21. Specifically, as shown in Figure 1 or Figure 3 , the oil guide plate 6 is arranged in a planar structure, which simplifies the manufacturing process of the oil guide plate 6 and reduces production costs. As shown in Figure 4As shown, the oil guide plate 6 is provided with an annular flange 62 on the side facing the conductive ring 5, which abuts against the inner wall of the mounting cavity 21, or the oil guide plate 6 is provided with an annular flange 62 on the side facing the end of the motor shaft 2, which can facilitate increasing the contact area of the oil guide plate 6 and the inner wall of the mounting cavity 21. Since the outer diameter of the annular flange 62 is in interference fit with the inner diameter of the mounting cavity 21, the annular flange 62 can increase the stability of the oil guide plate 6 in the mounting cavity 21, preventing it from moving due to vibration or external force. When the oil guide plate 6 bears greater pressure, the annular flange 62 can disperse the pressure, reducing the deformation and damage of the oil guide plate 6 itself. The close contact of the annular flange 62 and the inner wall of the mounting cavity 21 can form an effective sealing barrier to prevent oil leakage.
[0047] It can be understood that the motor shaft current elimination mechanism further comprises a first support bearing 7 and a second support bearing 8, the first support bearing 7 is arranged between the front end of the motor shaft 2 and the reduction box shell 1, and the second support bearing 8 is sleeved on the motor shaft 2 and located between the first support bearing 7 and the insulating bearing 3. Specifically, the first support bearing 7 is used for supporting the front end of the motor shaft 2, so that the motor shaft 2 can be rotatably connected to the reduction box shell 1; the second support bearing 8 can be supported at the middle part of the motor shaft 2, and share the load generated by the motor shaft 2 during rotation with the first support bearing 7 and the insulating bearing 3, thereby enhancing the carrying capacity of the motor shaft 2.
[0048] Based on the same concept, the utility model also provides a motor which comprises the motor shaft current elimination mechanism.
[0049] In summary, the motor shaft current elimination mechanism and the motor provided by the utility model can prevent the damage of shaft current to the motor shaft bearing by arranging the insulating bearing 3 at the side end of the motor, can lead the shaft current on the motor shaft 2 out, thereby avoiding the bearing electric corrosion caused by the shaft current, protecting the motor shaft bearing from damage and increasing the service life of the bearing, further, by arranging the oil guide plate 6, the deformation of the conductive ring 5 caused by the impact of a large amount of lubricating oil can be avoided, and better shaft current conduction effect can be ensured.
[0050] The above embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.
Claims
1. A motor shaft current elimination mechanism, characterized in that, include: The motor shaft has a front end that is rotatably connected to the gearbox housing, a mounting cavity is provided at the front end of the motor shaft, and an insulated bearing is fitted at the rear end of the motor shaft. An adapter shaft is connected to the gearbox housing and extends into the interior of the mounting cavity; A conductive ring is located inside the mounting cavity and connected between the adapter shaft and the motor shaft, so that the shaft current on the motor shaft is transmitted to the gearbox housing through the conductive ring and the adapter shaft.
2. The motor shaft current elimination mechanism according to claim 1, characterized in that, The conductive ring is fixedly sleeved on the adapter shaft, and the outer circumference of the conductive ring is in contact with the inner wall of the mounting cavity of the motor shaft.
3. The motor shaft current elimination mechanism according to claim 2, characterized in that, The conductive ring includes a ring body and a plurality of conductive brushes arranged circumferentially on the ring body. The fixed ends of the conductive brushes are connected to the ring body, and the free ends of the conductive brushes extend radially outward along the ring body.
4. The motor shaft current elimination mechanism according to claim 3, characterized in that, The inner diameter of the ring body is interference-fitted with the outer diameter of the adapter shaft, and the conductive brush abuts against the inner wall of the mounting cavity.
5. The motor shaft current elimination mechanism according to claim 3 or 4, characterized in that, The conductive brush is a bundle of conductive fibers.
6. The motor shaft current elimination mechanism according to claim 1, characterized in that, The adapter shaft is detachably connected to the gearbox housing. The gearbox housing has a first connecting part on the side facing the adapter shaft, and the adapter shaft has a second connecting part that is adapted to the first connecting part; or, the adapter shaft and the gearbox housing are integrally formed.
7. The motor shaft current elimination mechanism according to claim 1, characterized in that, It also includes an oil guide plate, which is fitted into the mounting cavity and located at the rear end of the adapter shaft. The outer peripheral sidewall of the oil guide plate abuts against the inner wall of the mounting cavity. The oil guide plate has a limiting hole, and the outer diameter of the rear end of the adapter shaft is adapted to the inner diameter of the limiting hole.
8. The motor shaft current elimination mechanism according to claim 7, characterized in that, The oil guide plate is configured as a planar structure; or, the oil guide plate is provided with an annular flange that abuts against the inner wall of the mounting cavity, the annular flange extending toward the conductive ring or toward the end of the motor shaft, and the outer diameter of the annular flange is interference-fitted with the inner diameter of the mounting cavity.
9. The motor shaft current elimination mechanism according to claim 1, characterized in that, It also includes a first support bearing and a second support bearing. The first support bearing is disposed between the front end of the motor shaft and the gearbox housing, and the second support bearing is sleeved on the motor shaft and located between the first support bearing and the insulating bearing.
10. An electric motor, characterized in that, Includes the motor shaft current elimination mechanism as described in any one of claims 1-9.