Electric slip ring mounting mechanism and motor rotor

Abstract

The utility model relates to the technical field of motors, in particular to an electric slip ring mounting mechanism and a motor rotor, which comprise a rotating shaft, a rotor assembly, an electric slip ring and an encoder, the rotating shaft comprises a first connecting end, a fixed connecting end, a second connecting end and an output connecting end which are arranged in sequence, and the encoder is arranged at the first connecting end. The rotor assembly is arranged at the fixed connecting end, the electric slip ring is arranged at the second connecting end, one end of the output connecting end is connected with the second connecting end, and the other end of the output connecting end penetrates through the electric slip ring and extends out of the electric slip ring. According to the utility model, the electric slip ring can be combined with the sensor, so that the motion state of the rotating part can be accurately monitored and controlled. The rotor assembly is arranged at the fixed connecting end, and the electric slip ring is arranged at the second connecting end, so that the space is saved, and the structure is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a slip ring installation mechanism and a motor rotor. Background Art

[0002] A brushless motor is a type of motor, also known as a brushless DC motor or an electronic speed control motor. Compared with traditional brushed DC motors, brushless motors do not require the use of brushes and slip rings for commutation, so they have higher efficiency, longer lifespan, and lower maintenance requirements. The working principle of a brushless motor is to use an electronic controller to achieve timely switching of the current, thereby driving the rotation of the motor rotor. It usually consists of a stator and a rotor. The stator contains several coils that generate a rotating magnetic field through the switching of the current. The rotor is equipped with permanent magnets or magnets and rotates under the action of the rotating magnetic field.

[0003] The slip ring on a motor is a device used to transmit electrical energy or signals, usually used in situations where rotating components require continuous power supply or data transmission. The slip ring mainly functions in equipment where rotating components need continuous power supply. It can transfer electrical energy from the fixed part to the rotating component through a rotating contactor to ensure the normal operation of the rotating component. Typical applications include wind turbines, rotating lamps, rotating platforms, etc. The existing installation structure of the motor slip ring is relatively complex, and there are deficiencies in the monitoring and control of the motion state of the rotating component during use. Therefore, new improvements need to be made to the existing slip ring installation structure. Summary of the Utility Model

[0004] To solve the above problems, the utility model can combine the slip ring with a sensor to achieve precise monitoring and control of the motion state of the rotating component. A slip ring installation mechanism and a motor rotor that save space and simplify the structure are adopted by setting the rotor assembly at the fixed connection end and the slip ring at the second connection end.

[0005] The technical solution adopted by the utility model is: a slip ring installation mechanism, including a rotating shaft, a rotor assembly, a slip ring, and an encoder. The rotating shaft includes a first connection end, a fixed connection end, a second connection end, and an output connection end arranged in sequence. The encoder is arranged at the first connection end, the rotor assembly is arranged at the fixed connection end, the slip ring is arranged at the second connection end, one end of the output connection end is connected to the second connection end, and the other end passes through the slip ring and extends to the outside of the slip ring.

[0006] A further improvement to the above solution is that the outer diameter dimension of the fixed connection end is larger than the outer diameter dimensions of the first connection end and the second connection end.

[0007] A further improvement to the above solution is that the first connection end is rotatably connected to the electric slip ring, the fixed connection end is fixedly connected to the rotor assembly, and the second connection end is rotatably connected to the encoder.

[0008] A further improvement to the above solution is that the rotor assembly includes a rotor bracket, a first magnetic pole element, and a second magnetic pole element; the rotor bracket includes an upper end portion and a lower end portion, a plurality of first magnetic pole grooves are provided on the outer periphery of the upper end portion, a plurality of second magnetic pole grooves are provided on the outer periphery of the lower end portion, the first magnetic pole element is disposed on the first magnetic pole groove, and the second magnetic pole element is disposed on the second magnetic pole groove.

[0009] A further improvement to the above solution is that an angle a is formed between the vertical line of the axis of the rotating shaft and the first magnetic pole element, and an angle b is formed between the center line of the vertical line of the axis of the rotating shaft and the center line of the second magnetic pole element, and the angle a is greater than or less than the angle b.

[0010] A further improvement to the above solution is that a fixed mating hole is provided at the axis of the rotor bracket, and the fixed connection end is used for fixedly connecting to the fixed mating hole.

[0011] A further improvement to the above solution is that a first pin hole is provided in the upper end portion, a second pin hole is provided in the lower end portion, the first pin hole and the second pin hole are coaxially arranged, and a fixed shaft pin connection is provided between the first pin hole and the second pin hole.

[0012] A further improvement to the above solution is that a first positioning stop is provided at intervals between two adjacent first magnetic pole grooves, and two adjacent first positioning stops are used for fixing the end face of the first magnetic pole element.

[0013] A further improvement to the above solution is that a second positioning stop is provided at intervals between two adjacent second magnetic pole grooves, and two adjacent second positioning stops are used for fixing the end face of the second magnetic pole element.

[0014] A further improvement to the above solution is that the first positioning stop and the second positioning stop are arranged staggeredly.

[0015] A further improvement to the above solution is that a first arc surface is provided on the outer periphery of the first magnetic pole element; a second arc surface is provided on the outer periphery of the second magnetic pole element; the outer diameter dimensions of the first arc surface and the second arc surface are the same.

[0016] A motor rotor includes the above-mentioned slip ring mounting mechanism. The motor rotor includes a first end cover and a second end cover. The first connection end passes through the first end cover, and the second connection end passes through the second end cover. The encoder is provided with a first connection piece, and the first connection piece is connected to the first end cover. The slip ring is provided with a second connection piece, and the second connection piece is connected to the second end cover. Both the first end cover and the second end cover are provided with bearings for rotatably connecting with the rotating shaft.

[0017] The beneficial effects of the present utility model are as follows:

[0018] Compared with the installation of the existing motor slip ring, the present utility model installs the slip ring on one end of the rotating shaft, saving space and being beneficial to wiring. By arranging the encoder at the first connection end of the rotating shaft, it is possible to realize real-time monitoring and feedback of parameters such as the position and speed of the rotating component, improving the control accuracy and stability of the system. Such a design can combine the slip ring with the sensor to achieve precise monitoring and control of the motion state of the rotating component. Adopting the method of setting the rotor assembly at the fixed connection end and the slip ring at the second connection end saves space and simplifies the structure. This layout makes the overall structure more compact, which is beneficial to realizing the power supply and data transmission of the rotating component in a limited space. The output connection end passes through the slip ring and extends to the outside of the slip ring, which can reduce the influence of the connection component when the slip ring rotates, reduce the wear between components, and improve the reliability and stability of the system. The present utility model fully considers factors such as the combination of the sensor and the slip ring, structural compactness, reliability, flexibility, and transmission efficiency, providing an efficient and stable solution for the power supply and data transmission of the rotating component.

[0019] The motor rotor adopting the above-mentioned slip ring installation mechanism can make the position of the sensor consistent with the rotation axis of the rotor by connecting the encoder with a first connecting piece to the first end cover and connecting the slip ring with a second connecting piece to the second end cover, thereby achieving more accurate and stable monitoring of the motion state of the rotating component, improving the control accuracy and reliability of the system. Both the first end cover and the second end cover are provided with bearings for rotatably connecting with the rotating shaft, making the structure of the entire motor rotor more compact and stable. This design can effectively support the rotational motion of the rotor, reduce vibration and noise, and improve the working stability and service life of the equipment. The integration design of the slip ring installation mechanism and the motor rotor enables a closer combination of power supply and data transmission. Such a design helps to simplify the layout of the entire system and improve the efficiency of power transmission and signal transmission. The combined use of the motor rotor solution reflects multiple technical effects such as optimized sensor position, compact and stable structure, and integration of power supply and data transmission, providing a high-performance overall solution for the power supply and data transmission of the rotating component. The utility model fully considers multiple key factors such as sensor position, compact and stable structure, and integration of power supply and data transmission, providing an efficient and stable overall solution for the power supply and data transmission of the rotating component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the slip ring installation mechanism of the present utility model;

[0021] Figure 2 is Figure 1 an exploded schematic diagram of the slip ring installation mechanism in

[0022] Figure 3 is Figure 1 a front view schematic diagram of the slip ring installation mechanism in

[0023] Figure 4 is Figure 3 a sectional view taken along A-A in

[0024] Figure 5 is Figure 1 a structural schematic diagram of the rotor assembly of the slip ring installation mechanism in

[0025] Figure 6 is Figure 1 a front view schematic diagram of the rotor assembly in

[0026] Description of the reference numerals in the drawings: rotating shaft 1, first connection end 11, fixed connection end 12, second connection end 13, output connection end 14, rotor assembly 2, rotor bracket 21, upper end portion 211, first magnetic pole slot 2111, first pin hole 2112, first positioning rib 2113, lower end portion 212, second magnetic pole slot 2121, second pin hole 2122, second positioning rib 2123, fixed mating hole 213, fixed shaft pin 214, first magnetic pole element 22, first arc surface 221, second magnetic pole element 23, second arc surface 231, electric slip ring 3, second connection piece 31, encoder 4, first connection piece 41, first end cover 5, second end cover 6. Detailed implementation

[0027] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Such as Figures 1 to 6As shown, in an embodiment of the present utility model, it relates to an installation mechanism for an electric slip ring, including a rotating shaft 1, a rotor assembly 2, an electric slip ring 3, and an encoder 4. The rotating shaft 1 includes a first connection end 11, a fixed connection end 12, a second connection end 13, and an output connection end 14 arranged in sequence. The encoder 4 is arranged at the first connection end 11, the rotor assembly 2 is arranged at the fixed connection end 12, the electric slip ring 3 is arranged at the second connection end 13. One end of the output connection end 14 is connected to the second connection end 13, and the other end passes through the electric slip ring 3 and extends to the outside of the electric slip ring 3. In this embodiment, the electric slip ring 3 is installed at one end of the rotating shaft 1, saving space and being beneficial for wiring. By arranging the encoder 4 at the first connection end 11 of the rotating shaft 1, parameters such as the position and speed of the rotating component can be monitored and fed back in real time, improving the control accuracy and stability of the system. Such a design enables the electric slip ring 3 to be combined with the sensor to achieve precise monitoring and control of the motion state of the rotating component. By adopting the method of arranging the rotor assembly 2 at the fixed connection end 12 and the electric slip ring 3 at the second connection end 13, space is saved and the structure is simplified. This layout makes the overall structure more compact, being beneficial for realizing the power supply and data transmission of the rotating component in a limited space. The output connection end 14 passes through the electric slip ring 3 and extends to the outside of the electric slip ring 3, which can reduce the influence on the connection component when the electric slip ring 3 rotates, reduce the wear between components, and improve the reliability and stability of the system. This embodiment fully considers factors such as the combination of the sensor and the electric slip ring 3, structural compactness, reliability, flexibility, and transmission efficiency, providing an efficient and stable solution for the power supply and data transmission of the rotating component.

[0030] The outer diameter dimension of the fixed connection end 12 is larger than the outer diameter dimensions of the first connection end 11 and the second connection end 13. In this embodiment, the size of the fixed connection end 12 is larger, facilitating the assembly of the rotor assembly 2. Moreover, a guiding inclined surface is arranged at the position of the fixed connection end 12 facing the first connection end 11, facilitating the assembly of the structure.

[0031] The first connection end 11 is rotatably connected to the electric slip ring 3, the fixed connection end 12 is fixedly connected to the rotor assembly 2, and the second connection end 13 is rotatably connected to the encoder 4. In this embodiment, by rotatably connecting the second connection end 13 to the encoder 4, a tight combination between the encoder 4 and the rotating component is achieved, so that the motion state of the rotating component can be accurately monitored, and the control precision and stability of the system are improved. The first connection end 11 is rotatably connected to the electric slip ring 3, and the fixed connection end 12 is fixedly connected to the rotor assembly 2. Such a design separates the power transmission from the data transmission, avoids mutual interference, and improves the reliability of the system. The rotatable connection between the first connection end 11 and the electric slip ring 3 and the fixed connection between the fixed connection end 12 and the rotor assembly 2 make the whole structure more stable, and at the same time, it is beneficial to reduce wear and extend the service life of the equipment. Rotatably connecting the first connection end 11 to the electric slip ring 3 and the second connection end 13 to the encoder 4 helps to optimize the layout of the sensors, ensures a stable connection between the sensors and the rotating component, and can accurately obtain the parameter information of the rotating component.

[0032] Refer to Figures 5 to 6As shown, the rotor assembly 2 includes a rotor bracket 21, a first magnetic pole element 22, and a second magnetic pole element 23; the rotor bracket 21 includes an upper end portion 211 and a lower end portion 212. A plurality of first magnetic pole grooves 2111 are provided on the outer periphery of the upper end portion 211, and a plurality of second magnetic pole grooves 2121 are provided on the outer periphery of the lower end portion 212. The first magnetic pole element 22 is disposed in the first magnetic pole grooves 2111, and the second magnetic pole element 23 is disposed in the second magnetic pole grooves 2121. Specifically, an angle a is formed between the vertical center line of the rotating shaft 1 and the first magnetic pole element 22, and an angle b is formed between the center line of the vertical center line of the rotating shaft 1 and the center line of the second magnetic pole element 23, and the angle a is greater than or less than the angle b. In this embodiment, a double inclined pole design is adopted. Specifically, by reasonably setting components such as the rotor bracket 21, the magnetic pole elements, and the magnetic pole grooves, the magnetic force transmission is made more stable and efficient. By utilizing the difference between the angle a and the angle b, the force transmission in different directions can be achieved, thereby improving the transmission efficiency. By adjusting the magnitude relationship between the angle a and the angle b, the direction of the force transmission can be precisely controlled, realizing the precise control of the magnetic force transmission process. This precise control helps to adapt to diverse working requirements, improving the flexibility and applicability of the device. Since the design of the double inclined pole mechanism can improve the transmission efficiency, the energy consumption can be reduced during actual operation, and the noise level during mechanical transmission is also reduced, enhancing the overall working environment and efficiency. The design of the double inclined pole mechanism adopts a relatively simplified structure, reducing the friction and wear between components, enhancing the overall stability and reliability, and reducing the maintenance cost and failure rate. In this embodiment, through reasonable structural design and magnetic force transmission principle, multiple technical effects such as the improvement of the transmission efficiency, the precise control of the force transmission direction, the reduction of energy consumption and noise, and the improvement of the structural stability are achieved, having broad application prospects and market potential.

[0033] A fixed mating hole 213 is provided at the center of the rotor bracket 21, and the fixed connection end 12 is used for fixedly connecting to the fixed mating hole 213. In this embodiment, through the design of the fixed connection portion and the fixed mating hole 213, the connection stability between the rotor bracket 21 and the rotating shaft 1 can be enhanced, reducing the risk of loosening caused by vibration or external forces, thereby improving the operating stability of the entire mechanism. The stable connection structure helps to reduce the relative displacement between components, thereby improving the accuracy and reliability of the transmission device, enabling the double inclined pole mechanism to more accurately achieve force transmission and control.

[0034] The upper end portion 211 is provided with a first pin hole 2112, the lower end portion 212 is provided with a second pin hole 2122, the first pin hole 2112 and the second pin hole 2122 are coaxially arranged, and a fixed shaft pin 214 is arranged between the first pin hole 2112 and the second pin hole 2122 for connection. In this embodiment, the upper end portion 211 and the lower end portion 212 are two independent parts. By connecting the pin holes of the upper and lower end portions 212 through the fixed shaft pin 214, the overall structural stability of the rotor bracket 21 can be enhanced, deformation or loosening caused by stress can be reduced, and the operating stability of the entire mechanism can be improved. The coaxial arrangement of the pin holes and the connection through the fixed shaft pin 214 can ensure that the positions and axes of the upper and lower end portions 212 are consistent, thereby improving the assembly accuracy of the mechanism, facilitating the more accurate matching of the magnetic pole element and the rotating shaft 1, and improving the accuracy and reliability of the transmission device. It is also convenient for the misaligned installation and fixation of the first magnetic pole groove 2111 and the second magnetic pole groove 2121, and the structure remains fixed after installation. The stable connection structure helps to reduce vibration and noise caused by relative displacement of components, and improves the overall operating smoothness and working environment.

[0035] A first positioning stop 2113 is arranged at intervals between two adjacent first magnetic pole grooves 2111, and two adjacent first positioning stops 2113 are used for fixing the end face of the first magnetic pole element 22; specifically, a second positioning stop 2123 is arranged at intervals between two adjacent second magnetic pole grooves 2121, and two adjacent second positioning stops 2123 are used for fixing the end face of the second magnetic pole element 23; the first positioning stop 2113 and the second positioning stop 2123 are arranged staggeredly. In this embodiment, by arranging the first positioning stop 2113 and the second positioning stop 2123, the end faces of the first magnetic pole element 22 and the second magnetic pole element 23 can be effectively fixed and positioned, improving the installation accuracy and stability of the magnetic pole element, and facilitating the ensuring of the uniformity of the magnetic field and the transmission accuracy. The precise positioning stop design helps to reduce the distortion and leakage of the magnetic field, ensure the correct position of the magnetic pole element on the rotor bracket 21, and thus improve the magnetic field control accuracy and stability of the entire mechanism. The setting of the positioning stop helps to reduce the risk of displacement and loosening of the magnetic pole element during operation. The staggered arrangement of the positioning stops helps to balance the action of the magnetic force, reduce the unbalanced force generated by the non-uniform magnetic field on the rotor bracket 21, and optimize the dynamic balance performance of the mechanism.

[0036] The outer periphery of the first magnetic pole element 22 is provided with a first arc surface 221; the outer periphery of the second magnetic pole element 23 is provided with a second arc surface 231; the outer diameter dimensions of the first arc surface 221 and the second arc surface 231 are the same. In this embodiment, the outer peripheries of the first magnetic pole element 22 and the second magnetic pole element 23 are provided with arc surfaces of the same size. This design is beneficial to ensuring the uniformity and symmetry of the magnetic field, improving the magnetic field control accuracy. Since the outer peripheries of the first magnetic pole element 22 and the second magnetic pole element 23 are provided with arc surfaces of the same size, the magnetic resistance can be reduced, the magnetic circuit can be improved, and thus the transmission efficiency is increased. The arc surface design helps to reduce the non-uniformity of the magnetic field, reduce the loss of magnetic energy, and improve the energy utilization rate of the system.

[0037] A motor rotor includes the above-mentioned slip ring 3 mounting mechanism. The motor rotor includes a first end cover 5 and a second end cover 6. The first connection end 11 passes through the first end cover 5, and the second connection end 13 passes through the second end cover 6. The encoder 4 is provided with a first connection piece 41, and the first connection piece 41 is connected to the first end cover 5. The slip ring 3 is provided with a second connection piece 31, and the second connection piece 31 is connected to the second end cover 6; both the first end cover 5 and the second end cover 6 are provided with bearings and are rotatably connected to the rotating shaft 1. For the motor rotor adopting the above-mentioned slip ring 3 mounting mechanism, by connecting the first connection piece 41 provided on the encoder 4 to the first end cover 5, and connecting the second connection piece 31 provided on the slip ring 3 to the second end cover 6, it can be ensured that the position of the sensor is consistent with the axis line of the rotating shaft 1 of the rotor, thereby realizing more accurate and stable monitoring of the motion state of the rotating component, and improving the control accuracy and reliability of the system. Both the first end cover 5 and the second end cover 6 are provided with bearings and are rotatably connected to the rotating shaft 1, making the structure of the entire motor rotor more compact and stable. This design can effectively support the rotational motion of the rotor, reduce vibration and noise, and improve the working stability and service life of the equipment. The integrated design of the slip ring 3 mounting mechanism and the motor rotor enables a closer combination of power supply and data transmission. Such a design helps to simplify the layout of the entire system and improve the efficiency of power transmission and signal transmission. The combined use of the motor rotor solutions reflects multiple technical effects such as optimized sensor position, compact and stable structure, and integrated power supply and data transmission, providing a high-performance overall solution for the power supply and data transmission of the rotating component. This embodiment fully considers multiple key factors such as sensor position, compact and stable structure, and integrated power supply and data transmission, providing an efficient and stable overall solution for the power supply and data transmission of the rotating component.

[0038] The above embodiments only illustrate several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. An electric slip ring mounting mechanism, characterized in that: It includes a rotating shaft, a rotor assembly, a slip ring and an encoder. The rotating shaft includes a first connection end, a fixed connection end, a second connection end and an output connection end arranged in sequence. The encoder is arranged at the first connection end, the rotor assembly is arranged at the fixed connection end, the slip ring is arranged at the second connection end, one end of the output connection end is connected to the second connection end, and the other end passes through the slip ring and extends to the outside of the slip ring.

2. The electric slip ring mounting mechanism according to claim 1, characterized in that: The outer diameter dimension of the fixed connection end is larger than the outer diameter dimensions of the first connection end and the second connection end.

3. The electric slip ring mounting mechanism according to claim 1, wherein: The first connection end is rotationally connected to the slip ring, the fixed connection end is fixedly connected to the rotor assembly, and the second connection end is rotationally connected to the encoder.

4. The electric slip ring mounting mechanism according to claim 1, characterized in that: The rotor assembly includes a rotor bracket, a first magnetic pole element and a second magnetic pole element; the rotor bracket includes an upper end portion and a lower end portion. A plurality of first magnetic pole grooves are arranged on the outer periphery of the upper end portion, and a plurality of second magnetic pole grooves are arranged on the outer periphery of the lower end portion. The first magnetic pole element is arranged on the first magnetic pole grooves, and the second magnetic pole element is arranged on the second magnetic pole grooves.

5. The electric slip ring mounting mechanism according to claim 4, characterized in that: An angle a is formed between the vertical line of the axis of the rotating shaft and the first magnetic pole element, and an angle b is formed between the center line of the vertical line of the axis of the rotating shaft and the center line of the second magnetic pole element. The angle a is greater than or less than the angle b.

6. The electric slip ring mounting mechanism according to claim 5, characterized in that: A fixed fitting hole is arranged at the axis center of the rotor bracket, and the fixed connection end is used for fixedly connecting the fixed fitting hole.

7. The electric slip ring mounting mechanism according to claim 5, characterized in that: The upper end portion is provided with a first pin hole, the lower end portion is provided with a second pin hole, the first pin hole and the second pin hole are coaxially arranged, and a fixed shaft pin connection is arranged between the first pin hole and the second pin hole.

8. The electric slip ring mounting mechanism according to claim 5, characterized in that: A first positioning stop strip is arranged at intervals between two adjacent first magnetic pole grooves, and two adjacent first positioning stop strips are used for fixing the end face of the first magnetic pole element; A second positioning stop strip is arranged at intervals between two adjacent second magnetic pole grooves, and two adjacent second positioning stop strips are used for fixing the end face of the second magnetic pole element; The first positioning stop strip and the second positioning stop strip are arranged staggeredly.

9. The electric slip ring mounting mechanism according to claim 5, characterized in that: A first arc surface is arranged on the outer periphery of the first magnetic pole element; a second arc surface is arranged on the outer periphery of the second magnetic pole element; the outer diameter dimensions of the first arc surface and the second arc surface are the same.

10. A motor rotor, characterized in that: It includes the slip ring installation mechanism according to any one of claims 1 to 9. The motor rotor includes a first end cover and a second end cover. The first connection end passes through the first end cover, the second connection end passes through the second end cover. The encoder is provided with a first connection piece, and the first connection piece is connected to the first end cover. The slip ring is provided with a second connection piece, and the second connection piece is connected to the second end cover; both the first end cover and the second end cover are provided with bearings for rotationally connecting with the rotating shaft.

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