Grounding device for motor shaft

Abstract

The invention discloses a grounding device for a motor shaft, and belongs to the technical field of grounding devices, the grounding device comprises a fixing ring and conductive fibers, the fixing ring comprises a pressing plate, a bottom plate and an annular shell, the pressing plate and the bottom plate are both arranged in the annular shell, the bottom plate is located on the side, away from the annular shell, of the pressing plate, and the conductive fibers are arranged in the annular shell. And the conductive fibers are arranged between the pressing plate and the bottom plate. According to the scheme, the conductive fibers can conveniently form a uniform and stable contact ring belt, and the grounding effect of the grounding device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of grounding devices, in particular to a grounding device for a motor shaft. BACKGROUND

[0002] With the acceleration of the process of modern industry and transportation electrification, high-power density and high-efficiency drive motors have become the core power source of many advanced equipment and systems. In order to meet the increasing requirements of performance and reliability of drive systems in various fields, modern motors generally need to operate continuously and stably under complex and severe working conditions such as high speed, high voltage, high frequency and high power density.

[0003] The motor mainly consists of a stator, a rotor, a motor shaft, a shell and a bearing. Among them, the bearing is fixed to the shell, the motor shaft rotates in cooperation with the bearing to realize the rotation relative to the shell, the rotor is installed on the motor shaft, and the stator is fixed to the shell. When the motor works, it mainly relies on the electromagnetic interaction between the stator and the rotor to drive the motor shaft to rotate. However, in this process, electromagnetic induction will generate induced voltage and current on the motor shaft. If the induced current is conducted to the bearing, it is easy to cause the problem of electrical corrosion of the bearing, leading to melting loss of the bearing, and even to the failure of locking, which seriously threatens the driving safety of electric vehicles.

[0004] There is currently a solution to grounding the motor shaft through a grounding device to block the induced current path. The grounding device mainly includes a fixed ring and conductive fibers arranged on the inner side of the fixed ring. Each conductive fiber is pressed and fixed to the fixed ring by a pin or a bolt. In use, the fixed ring is sleeved on the motor shaft, and the position of the fixed ring is fixed, so that the conductive fibers continuously tilt and press on the motor shaft during the rotation of the motor shaft to maintain electrical connection, thereby realizing the grounding of the motor shaft.

[0005] Although the above-mentioned method can realize the grounding of the motor shaft, the structure of relying on the pin or bolt to fix each conductive fiber seriously restricts the number of conductive fibers. The limitation of the number of conductive fibers caused by space competition makes the grounding channel redundant and less reliable, and it is difficult to form a uniform and stable contact ring belt, which further affects the grounding effect. SUMMARY

[0006] In order to facilitate the formation of a uniform and stable contact ring belt by the conductive fibers and ensure the grounding effect, the present application provides a grounding device for a motor shaft.

[0007] The grounding device for a motor shaft provided by the present application adopts the following technical scheme: The utility model provides an earth device for motor shaft, including fixed ring and conductive fiber, the fixed ring includes pressing plate, bottom plate and annular casing, the pressing plate and bottom plate are arranged in annular casing, the bottom plate is located the side of pressing plate away from annular casing, the conductive fiber is arranged between pressing plate and bottom plate.

[0008] Through the above technical scheme, the conductive fiber is clamped and installed between the pressing plate and the bottom plate, thereby facilitating the overall fixation of multiple conductive fibers, fundamentally avoiding the space competition and quantity limitation caused by the independent fixation of each conductive fiber by a pin or a bolt in the traditional scheme, facilitating the high-density and uniform distribution of a large number of conductive fibers in the circumferential direction of the fixed ring, improving the redundancy and reliability of the grounding channel, and further facilitating the conductive fiber to form a uniform and stable contact ring by leaning against the motor shaft, thereby ensuring the grounding effect.

[0009] Optionally, the pressing plate and the bottom plate are both annularly arranged, and the pressing plate and the bottom plate are fixed by bolts.

[0010] Through the above technical scheme, the conductive fiber is uniformly and stably pressed, and the fixing structure of the pressing plate is simple and easy to install.

[0011] Optionally, a plurality of installation grooves are formed on one side of the pressing plate facing the bottom plate and are uniformly distributed in the circumferential direction around the axis of the pressing plate, the installation grooves are used for placing the conductive fiber, and a plurality of installation protrusions corresponding to the installation grooves are fixedly arranged on one side of the bottom plate facing the pressing plate, and each installation protrusion is correspondingly and insertingly matched with each installation groove.

[0012] Through the above technical scheme, on the one hand, the positions of the pressing plate and the bottom plate are stably limited, ensuring that the pressing plate and the bottom plate are not easily dislocated in the circumferential and radial directions, and on the other hand, the uniform and stable pressing force on the conductive fiber is ensured, avoiding local loosening or excessive extrusion, so that the conductive fiber can be uniformly and densely arranged in the circumferential direction without interference, further improving the reliability of the contact ring formed by the conductive fiber.

[0013] Optionally, the pressing plate, the bottom plate, and the conductive fiber are uniformly distributed in multiple groups in the circumferential direction around the axis of the annular casing, each group of the pressing plate, the bottom plate, and the conductive fiber is an electrically conductive module, the pressing plate and the bottom plate of each group of the electrically conductive module are fixedly matched, and a movement assembly for driving each electrically conductive module to move towards or away from the axis of the annular casing is arranged in the annular casing.

[0014] Through the above technical scheme, the movement assembly is used to drive each electrically conductive module to move radially, the dynamic adjustment of the contact state between the conductive fiber and the motor shaft is realized, thereby facilitating the adaptation to motor shafts with different diameters and compensating for the wear of the conductive fiber, so that the conductive fiber and the motor shaft always maintain stable contact, thereby improving the service life.

[0015] Optionally, the movement assembly comprises a driving ring rotatably mounted on the annular housing, the driving ring is located on the side of the bottom plate far away from the pressing plate, a planar threaded tooth is fixedly arranged on the side of the driving ring facing the bottom plate, each of the bottom plates is provided with a driving groove on the side facing the driving ring, and a plurality of driving grooves are distributed along the radial direction of the annular housing.

[0016] By adopting the above technical scheme, when the force is applied to rotate the driving ring, the planar threaded tooth is in sliding fit with each driving groove, thereby driving each conductive module to move synchronously towards the direction close to or away from the axis of the annular housing, which is convenient and stable.

[0017] Optionally, the side of the driving ring far away from the conductive module is provided with a driven bevel gear uniformly distributed in the circumferential direction around the axis of the driving ring, the annular housing is provided with a driving bevel gear, the driving bevel gear is in meshing with the driven bevel gear, the driving bevel gear is coaxially fixedly connected with a driving rotating rod, and one end of the driving rotating rod penetrates out of the annular housing in the radial direction of the annular housing and is in rotational fit with the annular housing.

[0018] By adopting the above technical scheme, the cooperation of the driving bevel gear and the driven bevel gear realizes the conversion of the transmission direction, which provides great convenience for the operator to rotate the driving ring, so that the operator can realize the rotation of the driving ring by applying force to the rotating rod in the radial direction of the annular housing.

[0019] Optionally, the movement assembly comprises a movement sleeve, a movement guide and a movement elastic member, the movement sleeve is in threaded fit with the annular housing, the movement sleeve has a movement guide inclined surface, the movement guide inclined surface abuts against the side of each bottom plate facing the axis of the annular housing, the movement elastic member applies an elastic force to each conductive module to move towards the direction close to the axis of the annular housing, and the movement guide is used to guide the movement of the conductive module in the radial direction of the annular housing.

[0020] By adopting the above technical scheme, the force is applied to rotate the movement sleeve, so that the movement sleeve moves away from the annular housing, thereby causing each conductive module to move synchronously in the radial direction of the annular housing towards the direction close to the axis of the annular housing under the elastic force of the movement elastic member and the guiding effect of the movement guide, and the self-locking effect between the movement sleeve and the annular housing is conducive to fully ensuring the stability of the position of each conductive module after movement.

[0021] Optionally, the movement elastic member is selected to be a rubber ring or an annular spring, and the rubber ring or the annular spring is sleeved on the side of each conductive module far away from the axis of the annular housing.

[0022] By adopting the technical scheme, the rubber ring or the annular spring provides a uniform and continuous elastic pre-tightening force for the radial aggregation of all the conductive modules, which helps to ensure that the conductive fibers and the surface of the motor shaft always maintain stable and reliable contact pressure, while reducing the assembly complexity and cost caused by multiple independent springs, and the setting of the rubber ring or the annular spring helps to absorb the slight radial jump of the motor shaft, further improving the reliability of the grounding device.

[0023] Optionally, the outer circumferential surface of the bottom plate of each conductive module is provided with a containing clamping groove, and the rubber ring or the annular spring is located in the containing clamping groove of each bottom plate.

[0024] By adopting the technical scheme, the containing clamping groove is provided to further limit the rubber ring or the annular spring, so that the rubber ring or the annular spring is not easy to fall out during operation, which helps to further ensure the stability of the elastic force of the rubber ring or the annular spring.

[0025] Optionally, the movement guide piece is provided with a plurality of movement guide pieces corresponding to the conductive modules, each movement guide piece is fixedly arranged on the side of each conductive module away from the movement sleeve axis, and each movement guide piece is inserted into the movement elastic member.

[0026] By adopting the technical scheme, the movement guide piece is provided to limit and guide the elastic movement of the movement elastic member, which helps to ensure the stability of each conductive module when moving under the elastic force of the movement elastic member, and facilitates the stable installation between the conductive module and the movement elastic member.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application fundamentally avoids the space competition and quantity limitation caused by the independent fixation of each conductive fiber by means of pins or bolts in the traditional scheme, which facilitates the high-density and uniform arrangement of a large number of conductive fibers in the circumferential direction of the fixing ring, improves the redundancy and reliability of the grounding channel, and further facilitates the formation of a uniform and stable contact ring belt by the conductive fibers, thereby ensuring the grounding effect.

[0028] 2. The cooperation of the mounting protrusions and the mounting grooves stably limits the position of the pressing plate and the bottom plate, ensures that the pressing plate and the bottom plate are not easy to move in the circumferential and radial directions, and on the other hand, helps to ensure that the conductive fibers are uniformly and stably pressed, avoids local loosening or excessive extrusion, and enables the conductive fibers to be arranged circumferentially, uniformly, densely and without interference.

[0029] 3. By driving each conductive module to move radially, the dynamic adjustment of the contact state between the conductive fiber and the motor shaft is realized, so as to facilitate the adaptation to the motor shafts with different shaft diameters and compensate the wear of the conductive fiber, so that the conductive fiber and the motor shaft always maintain stable contact, and the service life is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the present application.

[0031] Figure 2 is an exploded schematic diagram of the overall structure of embodiment 1 of the present application.

[0032] Figure 3 is a schematic diagram of the overall structure of embodiment 2 of the present application.

[0033] Figure 4 is a schematic diagram of the internal structure of the annular housing in embodiment 2 of the present application.

[0034] Figure 5 is a schematic diagram of the internal structure of the annular housing in embodiment 2 of the present application from another perspective.

[0035] Figure 6 is a schematic diagram of the overall structure of embodiment 3 of the present application.

[0036] Figure 7 is a partial sectional view of the annular housing and the movement sleeve in embodiment 3 of the present application.

[0037] Figure 8 is a partial sectional view of the annular housing and the movement sleeve in embodiment 4 of the present application.

[0038] Figure 9 is a partial sectional view of the annular housing and the movement sleeve in embodiment 5 of the present application.

[0039] BRIEF DESCRIPTION OF DRAWINGS 1. fixing ring; 101, pressing plate; 102, bottom plate; 103, annular housing; 2, conductive fiber; 3, mounting groove; 4, mounting protrusion; 5, conductive module; 6, driving ring; 7, flat thread tooth; 8, driving groove; 9, driven bevel gear; 10, driving bevel gear; 11, driving rotating rod; 12, rotating handle; 13, movement sleeve; 14, movement guide slope; 15, driven slope; 16, annular spring; 17, accommodating clamping groove; 18, movement guide sheet; 19, conductive pressing part; 20, pressing sleeve; 201, sleeve pressing part; 21, movement movable groove. DETAILED DESCRIPTION

[0040] The following will be described in detail in combination with the accompanying Figures 1-9 The present application will be further described in detail. Embodiment 1

[0041] The motor shaft grounding device disclosed by the embodiments of the present application comprises a fixing ring 1 and a conductive fiber 2. Figure 1 and Figure 2 The fixing ring 1 comprises a pressing plate 101, a bottom plate 102 and a ring-shaped shell 103, the pressing plate 101 and the bottom plate 102 are arranged in the ring-shaped shell 103, the pressing plate 101 and the bottom plate 102 are arranged in a ring shape in the embodiments of the present application, the bottom plate 102 is located on the side of the pressing plate 101 away from the ring-shaped shell 103, and the bottom plate 102 is stably and fixedly installed on the pressing plate 101 by means of a bolt (not shown in the figure) penetrating the pressing plate 101 along the axis direction of the pressing plate 101 and screwing with itself. In the embodiments of the present application, the pressing plate 101, the bottom plate 102 and the ring-shaped shell 103 are all provided with a through hole 104 penetrating along the axis of the ring-shaped shell 103, so as to directly realize the fixation between the whole fixing ring 1 and the motor shell by means of the bolt penetrating the through hole 104, and when the ring-shaped shell 103 is fixed with the motor shell, the bottom plate 102 abuts against the motor shell, so as to synchronously ensure the stability of the position of the bottom plate 102.

[0042] Continuously referring to Figure 1 and Figure 2 Further, a plurality of installation grooves 3 uniformly distributed in the circumferential direction around the axis of the pressing plate 101 are formed on the side of the pressing plate 101 facing the bottom plate 102, the conductive fiber 2 is provided with a plurality of groups of installation grooves 3 one by one and is respectively installed in each installation groove 3, the bottom plate 102 is fixedly provided with an installation protrusion 4 corresponding to each installation groove 3 on the side of the bottom plate 102 facing the pressing plate 101, each installation protrusion 4 corresponds to each installation groove 3 and is inserted and connected, so as to play a stable limiting role on the conductive fiber 2 through the cooperation of the installation protrusion 4 and the installation groove 3, fully ensure the stability of the position of the conductive fiber 2 in the installation groove 3, facilitate the uniform, dense and non-interfering arrangement of the conductive fiber 2 in the circumferential direction, and the conductive fiber 2 is selected as a carbon fiber in the embodiments of the present application.

[0043] The implementation principle of the motor shaft grounding device in the embodiments of the present application is that the conductive fiber 2 is clamped and installed between the pressing plate 101 and the bottom plate 102, so as to facilitate the overall fixation of a plurality of conductive fibers 2, thereby fundamentally avoiding the space competition and quantity limitation problem caused by the independent fixation of each conductive fiber 2 by means of a pin or a bolt in the traditional scheme, facilitating the high-density and uniform arrangement of a large number of conductive fibers 2 in the circumferential direction of the fixing ring 1, improving the redundancy and reliability of the grounding channel, and further facilitating the conductive fiber 2 to form a uniform and stable contact ring belt, so as to ensure the grounding effect. Embodiment 2

[0044] Referring to Figure 3 and Figure 4The main difference between the embodiment and the embodiment 1 is that the structures of the pressing plate 101 and the bottom plate 102 are different, the cross sections of the pressing plate 101 and the bottom plate 102 are arc-shaped in the embodiment, the pressing plate 101, the bottom plate 102 and the conductive fiber 2 are uniformly distributed in multiple groups around the axis of the annular shell 103, each group of the pressing plate 101, the bottom plate 102 and the conductive fiber 2 is arranged as a conductive module 5, the active gap is arranged between the adjacent two groups of the conductive module 5, and the pressing plate 101 and the bottom plate 102 of each group of the conductive module 5 are stably fixed by the countersunk bolt arranged in the bottom plate 102 and threadedly matched with the pressing plate 101. In the embodiment, the mounting groove 3 and the mounting block 4 are arranged between the pressing plate 101 and the bottom plate 102, and the specific structure is not described here.

[0045] With reference to Figure 4 The annular shell 103 is provided with a movement assembly for driving each conductive module 5 to move towards or away from the axis direction of the annular shell 103, the movement assembly includes a driving ring 6 rotatably arranged on the annular shell 103, the driving ring 6 is located on the side of the bottom plate 102 away from the pressing plate 101, the side of the driving ring 6 facing the bottom plate 102 is fixedly provided with a plane thread tooth 7, and the side of each bottom plate 102 facing the driving ring 6 is provided with a driving groove 8, the driving groove 8 is distributed in multiple groups along the radial direction of the annular shell 103, and the plane thread tooth 7 is slidably matched with the driving groove 8 of each bottom plate 102, so that when the driving ring 6 rotates, the plane thread tooth 7 drives each conductive module 5 to synchronously move towards or away from the axis direction of the annular shell 103 due to the sliding fit with each driving groove 8.

[0046] With reference to Figure 3 and Figure 5 In order to facilitate the rotation of the driving ring 6, the side of the driving ring 6 away from the conductive module 5 is provided with a driven bevel gear 9 uniformly distributed around the axis thereof, the annular shell 103 is provided with a driving bevel gear 10, the driving bevel gear 10 is engaged with the driven bevel gear 9, the driving bevel gear 10 is coaxially fixedly connected with a driving rotating rod 11, one end of the driving rotating rod 11 penetrates out of the annular shell 103 along the radial direction of the annular shell 103 and is rotatably matched with the annular shell 103, and the end of the driving rotating rod 11 located outside the annular shell 103 is fixedly connected with a rotating handle 12, so as to facilitate the rotation of the driving rotating rod 11 and the driving bevel gear 10 by applying force. In the embodiment, the annular shell 103 can be fixed by additionally arranging an ear plate or other auxiliary devices, which is a conventional technical means in the field and is not the focus of improvement of the present application, and is not described here.

[0047] The embodiment of the application has the same implementation principle as that of the embodiment 1, and the main difference is that in the embodiment of the application, the driving ring 6 is rotated by using the rotating handle 12 to apply force, and then each conductive module 5 is driven to move radially, so that the dynamic adjustment of the contact state of the conductive fiber 2 and the motor shaft is realized, which is convenient for adapting to the motor shafts with different diameters and compensating for the wear of the conductive fiber 2, thereby being conducive to keeping the conductive fiber 2 in stable contact with the motor shaft at all times without replacing the conductive fiber 2, and improving the service life. Embodiment 3

[0048] With reference to Figure 6 and Figure 7 , the main difference between the embodiment of the application and the embodiment 2 is that the structure of the movement assembly is different, and in the embodiment of the application, the movement assembly includes a movement sleeve 13, a movement guide and a movement elastic member, wherein the movement sleeve 13 is located on the side of the bottom plate 102 away from the pressing plate 101 and is threadedly connected to the annular housing 103, and one end of the movement sleeve 13 is located outside the annular housing 103, so as to facilitate the operator to apply force to rotate the movement sleeve 13.

[0049] With reference to Figure 7 , one end of the movement sleeve 13 towards the bottom plate 102 has a movement guide inclined surface 14, and each bottom plate 102 has a driven inclined surface 15 on the side thereof towards the axis direction of the annular housing 103, that is, the movement guide inclined surface 14 is in contact with the driven inclined surface 15. The movement elastic member can be selected as a rubber ring or an annular spring 16, and in the embodiment of the application, the movement elastic member is specifically selected as the annular spring 16. The outer circumferential surface of each bottom plate 102 is provided with a receiving clamping groove 17, and the annular spring 16 is clamped and matched in the receiving clamping groove 17 of each bottom plate 102, so as to provide a uniform and stable radial inward aggregation elastic pre-tightening force for all conductive modules 5.

[0050] With reference to Figure 6 and Figure 7The movement guide piece includes movement guide pieces 18, and the movement guide pieces 18 are provided in a one-to-one correspondence with the conductive modules 5. Each movement guide piece 18 is fixedly arranged on a side of each conductive module 5 away from the axis of the movement sleeve 13, and each movement guide piece 18 is inserted into the annular spring 16. Specifically, in the embodiment of the application, each movement guide piece 18 is fixedly installed on the slot wall of the accommodating clamping groove 17 in each conductive module 5, so that the movement guide piece 18 plays a limiting and guiding role when the annular spring 16 is elastically moved, thereby facilitating the stability of each conductive module 5 when moving under the elastic force of the annular spring 16. At the same time, it is convenient to quickly realize the stable installation between the conductive module 5 and the annular spring 16. In the embodiment of the application, the annular shell 103 can also be fixed by the additionally provided ear plate or other auxiliary device. This fixing mode is a conventional technical means in the art, and is not the improvement focus of the application, and will not be described here.

[0051] The application also discloses a mounting process of the grounding device for the motor shaft, which includes the following steps: S1, the annular spring 16 is sleeved in the accommodating clamping groove 17 of each conductive module 5, and each movement guide piece 18 is inserted into the gap of the annular spring 16; S2, each conductive module 5 sleeved with the annular spring 16 is arranged at one end of the movement sleeve 13 provided with the movement guide slope 14, so that the movement guide slope 14 is in abutment with each driven slope 15; S3, then the annular shell 103 is sleeved on the movement sleeve 13 and the movement sleeve 13 is screwed, so as to realize the mounting of the grounding device for the motor shaft. The structure mounting mode is simple and convenient to operate, and after mounting, the dynamic adjustment of the contact state of the conductive fiber 2 and the motor shaft can be realized by screwing the movement sleeve 13 by force, which is convenient for adapting to motor shafts of different diameters and compensating for the wear of the conductive fiber 2, and is conducive to keeping each conductive fiber 2 in stable contact with the motor shaft without replacing the conductive fiber 2.

[0052] The embodiment of the application has the same implementation principle as that of the embodiment 1, and the main difference lies in that the movement sleeve 13 is rotated by force, so that the movement sleeve 13 moves away from the annular shell 103, so that each conductive module 5 moves along the radial direction of the annular shell 103 under the elastic force of the annular spring 16 and the guiding action of the movement guide piece 18, thereby realizing dynamic adjustment of the contact state of the conductive fiber 2 and the motor shaft, facilitating adaptation to motor shafts of different diameters and compensating for wear of the conductive fiber 2, and being conducive to maintaining stable contact between each conductive fiber 2 and the motor shaft without replacing the conductive fiber 2, thereby improving the service life. The self-locking effect of the threads between the movement sleeve 13 and the annular shell 103 in the embodiment of the application is conducive to fully ensuring the stability of the position of each conductive module 5 after movement, and the use of the rubber ring or the annular spring 16 helps to absorb slight radial jumping of the motor shaft, thereby facilitating further improvement of the reliability of the grounding device. Embodiment 4

[0053] With reference to Figure 8 The main difference between the embodiment of the application and the embodiment 3 lies in that the inner circumferential surface of the movement sleeve 13 is integrally fixedly connected with the annular conductive pressing part 19, the conductive pressing part 19 presses each conductive fiber 2 of each conductive module 5, so that each conductive fiber 2 is stably pressed obliquely on the motor shaft, thereby reducing the problem of interruption of the grounding loop caused by possible poor contact or insulation gap between the movement sleeve 13 and the conductive fiber 2. The embodiment of the application has the same implementation principle as that of the embodiment 3, and details are not repeated here. Embodiment 5

[0054] With reference to Figure 9 The main difference between the embodiment of the application and the embodiment 3 lies in that the inner circumferential surface of the movement sleeve 13 is threadedly connected with the pressing sleeve 20, each pressing sleeve 20 is integrally fixedly connected with the annular sleeve pressing part 201 near the end of the conductive fiber 2, the sleeve pressing part 201 presses each conductive fiber 2 of each conductive module 5, so that each conductive fiber 2 is stably pressed obliquely on the motor shaft, and at the same time, the degree of inclination of the conductive fiber 2 is adjusted by screwing the pressing sleeve 20, thereby reducing the problem of interruption of the grounding loop caused by possible poor contact or insulation gap between the movement sleeve 13 and the conductive fiber 2 during adjustment. The end of the movement sleeve 13 away from the annular shell 103 is provided with a movement slot 21, and the pressing sleeve 20 is located in the movement slot 21, so as to reasonably plan the installation space and effectively avoid the increase in the overall size of the device due to the increase in the number of parts, and facilitate force to rotate the pressing sleeve 20. The embodiment of the application has the same implementation principle as that of the embodiment 3, and details are not repeated here.

[0055] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A grounding device for a motor shaft, characterized in that: The device includes a fixing ring (1) and a conductive fiber (2). The fixing ring (1) includes a pressure plate (101), a base plate (102), and an annular shell (103). The pressure plate (101) and the base plate (102) are both disposed inside the annular shell (103). The base plate (102) is located on the side of the pressure plate (101) away from the annular shell (103). The conductive fiber (2) is disposed between the pressure plate (101) and the base plate (102).

2. The grounding device for a motor shaft according to claim 1, characterized in that: The pressure plate (101) and the base plate (102) are both arranged in a ring shape, and the pressure plate (101) and the base plate (102) are fixed by bolts.

3. A grounding device for a motor shaft according to claim 2, characterized in that: The pressure plate (101) has multiple mounting grooves (3) evenly distributed around its own axis on the side facing the base plate (102). The mounting grooves (3) are used to place the conductive fiber (2). The base plate (102) is fixedly provided with mounting protrusions (4) that correspond one-to-one with the mounting grooves (3) on the side facing the pressure plate (101). Each mounting protrusion (4) corresponds to and is inserted into each mounting groove (3).

4. A grounding device for a motor shaft according to claim 1, characterized in that: The pressure plate (101), the base plate (102), and the conductive fiber (2) are all evenly distributed in multiple groups around the axis of the annular shell (103). Each group of the pressure plate (101), the base plate (102), and the conductive fiber (2) is set as a conductive module (5). The pressure plate (101) and the base plate (102) of each group of conductive modules (5) are fixedly engaged. The annular shell (103) is provided with a motion component that drives each conductive module (5) to move toward or away from the axis of the annular shell (103).

5. A grounding device for a motor shaft according to claim 4, characterized in that: The motion assembly includes a drive ring (6) rotatably mounted on the annular housing (103). The drive ring (6) is located on the side of the base plate (102) away from the pressure plate (101). The drive ring (6) is fixedly provided with a planar threaded tooth (7) on the side facing the base plate (102). Each base plate (102) is provided with a drive groove (8) on the side facing the drive ring (6). Multiple drive grooves (8) are distributed along the radial direction of the annular housing (103). The planar threaded tooth (7) slides and engages with the drive groove (8) of each base plate (102).

6. A grounding device for a motor shaft according to claim 5, characterized in that: The drive ring (6) is provided with driven bevel teeth (9) evenly distributed around its own axis on the side away from the conductive module (5). The annular housing (103) is provided with an active bevel gear (10). The active bevel gear (10) meshes with the driven bevel teeth (9). The active bevel gear (10) is coaxially fixedly connected to an active rotating rod (11). One end of the active rotating rod (11) passes through the annular housing (103) in the radial direction and rotates with the annular housing (103).

7. A grounding device for a motor shaft according to claim 4, characterized in that: The motion assembly includes a motion sleeve (13), a motion guide, and a motion elastic member. The motion sleeve (13) is threaded into the annular housing (103). The motion sleeve (13) has a motion guide slope (14). The motion guide slope (14) abuts against the side of each base plate (102) facing the axis of the annular housing (103). The motion elastic member drives each conductive module (5) to move toward the axis of the annular housing (103). The motion guide is used to guide the movement of the guide module along the radial direction of the annular housing (103).

8. A grounding device for a motor shaft according to claim 7, characterized in that: The motion elastic element is selected as a rubber ring or a ring spring (16), and the rubber ring or ring spring (16) is sleeved on the side of each conductive module (5) away from the axis of the annular shell (103).

9. A grounding device for a motor shaft according to claim 8, characterized in that: Each conductive module (5) has a receiving slot (17) on the outer periphery of its base plate (102), and the rubber ring or annular spring (16) is located in the receiving slot (17) of each base plate (102).

10. A grounding device for a motor shaft according to claim 7, characterized in that: The motion guide includes a motion guide plate (18), and multiple motion guide plates (18) are provided in a one-to-one correspondence with the conductive module (5). Each motion guide plate (18) is fixedly disposed on the side of each conductive module (5) away from the axis of the motion sleeve (13), and each motion guide plate (18) is inserted into the motion elastic member.

Images