A coreless motor capable of reducing vibration

Abstract

The present invention discloses a coreless motor capable of reducing vibration. It includes a motor body and a motor housing. An anti-vibration cup is provided inside the motor housing. The motor body is installed inside the anti-vibration cup. The material of the anti-vibration cup is a flexible material. A buffer cavity is provided inside the anti-vibration cup. The buffer cavity is located outside the motor body. A number of first buffer springs are installed inside the buffer cavity. One end of the first buffer spring is fixed on the side wall of the buffer cavity close to the motor body, and the other end of the first buffer spring is fixed on the side wall of the buffer cavity close to the motor housing. A cover plate is provided on the motor housing. The cover plate is installed at the opening of the anti-vibration cup. A buffer pressing device matching the motor body is provided on the cover plate. The beneficial effect of the present invention is that it can effectively prevent the vibration generated during the operation of the motor body from being transmitted to the external motor housing, thereby achieving the effect of reducing vibration.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a cup-shaped hollow motor capable of reducing vibration. Background Art

[0002] The cup-shaped hollow motor belongs to a DC permanent magnet servo and control motor, and can also be classified as a micro-specialty motor. The cup-shaped hollow motor has prominent energy-saving characteristics, sensitive and convenient control characteristics, and stable operating characteristics, and its technological advancement is very obvious. As a high-efficiency energy conversion device, it represents the development direction of motors in many fields.

[0003] Chinese Patent Publication No.: CN112202260A, Publication Date: January 8, 2021, discloses a cup-shaped hollow motor, including a rotor, a stator, and a PCB board. A winding is provided inside the stator. The tap of the winding directly extends through the PCB board as a wiring terminal, or each tap of the winding and the corresponding wiring terminal are welded together in the welding holes of the PCB board; the PCB board is provided with through holes for the taps to pass through; the through holes are kidney-shaped holes; the number of the through holes is set according to needs, preferably 3; the welding holes are kidney-shaped holes; the number of the welding holes is set according to needs, preferably 3; the winding is a thick wire self-adhesive wire winding. The disadvantage of this patent is that the vibration generated during the operation of the cup-shaped hollow motor will be directly transmitted to the external structure, causing vibration of the external structure. During the operation of this cup-shaped hollow motor, its main body will generate a certain amplitude of vibration. When this cup-shaped hollow motor is applied to devices such as electric toothbrushes, the vibration generated will be transmitted to the external structure, which will affect the final use experience.

[0004] In summary, there is a need for a cup-shaped hollow motor that can reduce vibration at present. Summary of the Invention

[0005] The present invention is to overcome the deficiency that during the operation of the cup-shaped hollow motor in the prior art, its main body will generate a certain amplitude of vibration, and when this cup-shaped hollow motor is applied to devices such as electric toothbrushes, the vibration generated will be transmitted to the external structure, which will affect the final use experience, and provides a cup-shaped hollow motor capable of reducing vibration.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A coreless motor capable of reducing vibration, comprising a motor body and a motor housing. An anti-vibration cup is provided inside the motor housing. The motor body is installed inside the anti-vibration cup. The material of the anti-vibration cup is a flexible material. A buffer cavity is provided inside the anti-vibration cup. The buffer cavity is located outside the motor body. A number of first buffer springs are installed inside the buffer cavity. One end of the first buffer spring is fixed on the side wall of the buffer cavity close to the motor body, and the other end of the first buffer spring is fixed on the side wall of the buffer cavity close to the motor housing. A cover plate is provided on the motor housing. The cover plate is installed at the opening of the anti-vibration cup. A buffer pressing device matching the motor body is provided on the cover plate.

[0008] The vibration generated during the operation of the motor body is buffered by the anti-vibration cup and the first buffer springs inside it, effectively preventing the vibration generated during the operation of the motor body from being transmitted to the external motor housing, thus achieving the effect of reducing vibration. Among them, the cover plate plays a role in installing and fixing the anti-vibration cup and the motor body inside the motor housing. The cover plate presses the motor body tightly inside the motor housing through the buffer pressing device to fix it, improving the fixing effect of the motor body inside the motor housing.

[0009] Preferably, a number of first heat dissipation through holes are provided on the side wall and the bottom surface of the anti-vibration cup. Corresponding second heat dissipation through holes are provided on the side wall and the bottom surface of the motor housing. The heat generated during the operation of the motor body can be discharged from the motor housing through the first heat dissipation through holes and the second heat dissipation through holes in sequence, improving the heat dissipation effect of the motor body and extending its service life.

[0010] Preferably, a number of heat dissipation grooves are provided on the inner wall and the inner bottom surface of the motor housing. The second heat dissipation through holes are located on the bottom surface of the heat dissipation grooves. Through the design of the heat dissipation grooves, the contact area between the inner wall of the motor housing and the anti-vibration cup can be reduced, enabling the heat during the operation of the motor body to circulate better, and further improving the heat dissipation effect of the motor body.

[0011] Preferably, a buffer liquid is provided inside the buffer cavity. A buffer liquid injection and discharge port is provided on the side wall of the buffer cavity. Through the design of the buffer liquid, on the one hand, it can further buffer the vibration generated during the operation of the motor body, and on the other hand, it can also offset part of the elastic force when the first buffer spring rebounds, further improving the vibration reduction effect.

[0012] Preferably, the motor housing and the cover plate are connected by threads. The buffer pressing device includes a fixed block fixed on the cover plate. The fixed block is disposed on the side of the cover plate facing the motor body. The fixed block is located inside the opening of the damping cup. A pressing column is provided on the fixed block. One end of the pressing column is installed on the fixed block and is movably connected thereto. The other end of the pressing column faces the motor body and a pressing plate is fixed thereon. The pressing plate and the fixed block are connected by a second buffer spring. The pressing plate on the pressing column presses on the motor body under the elastic force of the second buffer spring, thereby fixing the motor body inside the damping cup. Moreover, the vibration generated when the motor body works can also be buffered by the second buffer spring, which not only improves the stability of the motor body inside the motor housing but also enhances the damping effect.

[0013] Preferably, a fixed block cavity is provided inside the fixed block. Damping liquid is provided in the fixed block cavity. A pressing column through hole matching the pressing column is provided on the side wall of one side of the fixed block cavity. One end of the pressing column passes through the pressing column through hole and is hermetically and slidably connected to the fixed block cavity. A top block matching one end of the pressing column is fixed on the side wall of one side of the fixed block cavity. A damping sliding plate is provided on the side wall of the pressing column. The damping sliding plate is disposed inside the fixed block cavity and is slidably connected thereto. A damping through hole is provided on the damping sliding plate. When the pressing column and the damping sliding plate vibrate synchronously with the vibration generated when the motor body works, the damping force formed by the friction between the hole wall of the damping through hole and the damping liquid and the internal friction between the damping liquid molecules not only plays a role in further damping and buffering the vibration transmitted from the motor body to the pressing column, but also can offset part of the elastic force when the second buffer spring rebounds, further increasing the stability of the motor body inside the motor housing and further enhancing the damping effect.

[0014] Preferably, a cover plate through hole is provided on the cover plate. A turntable is provided inside the cover plate through hole. The turntable is rotatably connected to the cover plate. A turntable through hole is provided on the turntable. A rotating shaft is provided on the motor body. The rotating shaft is located inside the turntable through hole. A number of pressing rods are also provided in the turntable through hole. The pressing rods are annularly distributed outside the rotating shaft. One end of the pressing rod is installed on the inner wall of the turntable through hole and is rotatably connected thereto. A pressing block is provided at the other end of the pressing rod. One side of the pressing block is disposed on the side wall of the rotating shaft and is in damping contact therewith. Heat dissipation fins are provided on the other side of the pressing block. The pressing rods on the turntable press the pressing blocks on the side wall of the rotating shaft. When the rotating shaft rotates, the turntable will be driven to rotate with the rotating shaft under the friction force between the pressing block and the side wall of the rotating shaft. At this time, the heat dissipation fins on all the pressing blocks also rotate with the rotating shaft, forming a heat dissipation fan to perform air cooling on the motor body inside the motor housing, further improving the heat dissipation effect.

[0015] Preferably, a first pressure rod mounting groove matching one end of the pressure rod is provided on the inner wall of the turntable through hole. One end of the pressure rod is placed in the first pressure rod mounting groove. A torsion spring is connected between one end of the pressure rod and the inner wall of the first pressure rod mounting groove. A second pressure rod mounting groove matching the other end of the pressure rod is provided on the pressure block. A fixing pin is provided in the second pressure rod mounting groove. A fixing pin through hole matching the fixing pin is provided at the other end of the pressure rod. The other end of the pressure rod is installed in the second pressure rod mounting groove through the cooperation of the fixing pin through hole and the fixing pin and is rotatably connected thereto. One end of the pressure rod is installed in the first pressure rod mounting groove through a torsion spring. On the one hand, the pressure block on the pressure rod can be tightly pressed against the side wall of the rotating shaft. On the other hand, direct contact between the pressure rod and the turntable can be avoided, effectively preventing the vibration of the rotating shaft from being transmitted to the cover plate and further improving the vibration damping effect.

[0016] Preferably, a friction layer is provided on the pressure block, and the friction layer is located on the surface of the pressure block in contact with the rotating shaft. Through the design of the friction layer on the pressure block, the friction effect between the pressure block and the rotating shaft is improved, the situation of slipping between the pressure block and the rotating shaft can be avoided, and a good heat dissipation effect of the radiator fan (composed of radiator blades) is ensured.

[0017] Preferably, an annular flange is provided on the outer side wall of the turntable, and a flange mounting groove matching the annular flange is provided on the inner side wall of the cover plate through hole. The turntable is installed on the inner side of the cover plate through hole through the cooperation of the annular flange and the flange mounting groove and is rotatably connected thereto. Through the design of the annular flange and the flange mounting groove, the installation of the turntable in the cover plate through hole is facilitated, and at the same time, it plays a role of guiding and limiting the rotation of the turntable in the cover plate through hole.

[0018] The beneficial effects of the present invention are as follows: The vibration generated when the motor body works can be effectively avoided from being transmitted to the external motor housing, thereby achieving the effect of reducing vibration; the fixing effect of the motor body in the motor housing is improved; the heat dissipation effect of the motor body is improved, and the service life is increased; the stability of the motor body inside the motor housing is increased. Description of the Drawings

[0019] Figure 1 is a front view of the present invention;

[0020] Figure 2 is a top view of the present invention;

[0021] Figure 3 is Figure 2 a cross-sectional view taken along line B-B in

[0022] Figure 4 is Figure 1 a cross-sectional view taken along line A-A in

[0023] Figure 5 isFigure 3 Enlarged view at position C in the figure;

[0024] Figure 6 is Figure 3 Enlarged view at position D in the figure;

[0025] Figure 7 is the structural schematic diagram of the cover plate in the natural state.

[0026] In the figure: 1. Motor body, 2. Motor housing, 3. Vibration damping cup, 4. Buffer cavity, 5. First buffer spring, 6. Cover plate, 7. First heat dissipation through hole, 8. Second heat dissipation through hole, 9. Heat discharge groove, 10. Buffer liquid, 11. Fixed block, 12. Pressing column, 13. Pressing plate, 14. Second buffer spring, 15. Cavity of the fixed block, 16. Damping liquid, 17. Through hole of the pressing column, 18. Top block, 19. Damping slide plate, 20. Damping through hole, 21. Through hole of the cover plate, 22. Turntable, 23. Through hole of the turntable, 24. Rotating shaft, 25. Pressing rod, 26. Pressing block, 27. Heat dissipation fin, 28. First mounting groove of the pressing rod, 29. Coil spring, 30. Second mounting groove of the pressing rod, 31. Fixed pin, 32. Through hole of the fixed pin, 33. Friction layer, 34. Annular flange, 35. Mounting groove of the flange, 36. First limiting plate, 37. Second limiting plate, 38. Buffer liquid injection and discharge port. Embodiment

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] As Figure 1 and Figure 4 、 Figure 2 and Figure 3 In the embodiments described above, a hollow cup motor capable of reducing vibration includes a motor body 1 and a motor housing 2. A vibration damping cup 3 is provided inside the motor housing 2, and the motor body 1 is installed inside the vibration damping cup 3. The material of the vibration damping cup 3 is a flexible material (rubber). A buffer cavity 4 is provided inside the vibration damping cup 3. The buffer cavity 4 is located outside the motor body 1. A number of first buffer springs 5 are installed inside the buffer cavity 4. One end of the first buffer spring 5 is fixed on the side wall of the buffer cavity 4 close to the motor body 1, and the other end of the first buffer spring 5 is fixed on the side wall of the buffer cavity 4 close to the motor housing 2. A cover plate 6 is provided on the motor housing 2, and the cover plate 6 is installed at the opening of the vibration damping cup 3. A buffer pressing device matching the motor body 1 is provided on the cover plate 6.

[0029] A number of first heat dissipation through holes 7 are provided on the side wall and the bottom surface of the vibration damping cup 3, and corresponding second heat dissipation through holes 8 are provided on the side wall and the bottom surface of the motor housing 2.

[0030] On the inner wall and the inner bottom surface of the motor housing 2, there are several heat dissipation grooves 9, and the second heat dissipation through hole 8 is located on the bottom surface of the heat dissipation groove 9.

[0031] Inside the buffer cavity 4, there is buffer liquid 10 (water), and on the side wall of the buffer cavity 4, there is a buffer liquid injection and discharge port 38.

[0032] As Figure 3 and Figure 5 shown, the motor housing 2 and the cover plate 6 are in threaded connection. The buffer pressing device includes a fixed block 11 fixed on the cover plate 6. The fixed block 11 is placed on the side of the cover plate 6 facing the motor body 1. The fixed block 11 is located inside the opening of the damping cup 3. On the fixed block 11, there is a pressure column 12. One end of the pressure column 12 is installed on the fixed block 11 and is movably connected to it. The other end of the pressure column 12 faces the motor body 1 and a pressure plate 13 is fixed on it. Between the pressure plate 13 and the fixed block 11, there is a second buffer spring 14 connected.

[0033] Inside the fixed block 11, there is a fixed block cavity 15. Inside the fixed block cavity 15, there is damping liquid 16. On one side wall of the fixed block cavity 15, there is a pressure column through hole 17 matching the pressure column 12. One end of the pressure column 12 passes through the pressure column through hole 17 and is placed inside the fixed block cavity 15 and is in sealed sliding connection with it. On one side wall of the fixed block cavity 15, there is a top block 18 (rubber) matching one end of the pressure column 12 fixed. On the side wall of the pressure column 12, there is a damping slide plate 19. The damping slide plate 19 is placed inside the fixed block cavity 15 and is in sliding connection with it. On the damping slide plate 19, there is a damping through hole 20.

[0034] As Figure 3 and Figure 6 shown, on the cover plate 6, there is a cover plate through hole 21. Inside the cover plate through hole 21, there is a turntable 22. The turntable 22 is rotatably connected to the cover plate 6. On the turntable 22, there is a turntable through hole 23. On the motor body 1, there is a rotating shaft 24. The rotating shaft 24 is located inside the turntable through hole 23. Inside the turntable through hole 23, there are also several pressure rods 25. The pressure rods 25 are annularly distributed outside the rotating shaft 24. One end of the pressure rod 25 is installed on the inner wall of the turntable through hole 23 and is rotatably connected to it. The other end of the pressure rod 25 is provided with a pressure block 26. One side of the pressure block 26 is placed on the side wall of the rotating shaft 24 and the two are in damping contact. On the other side of the pressure block 26, there are heat dissipation fins 27.

[0035] On the inner wall of the through hole 23 of the turntable, there is a first press rod mounting groove 28 that matches one end of the press rod 25. One end of the press rod 25 is placed in the first press rod mounting groove 28. A coil spring 29 is connected between one end of the press rod 25 and the inner wall of the first press rod mounting groove 28. On the pressing block 26, there is a second press rod mounting groove 30 that matches the other end of the press rod 25. A fixing pin 31 is provided in the second press rod mounting groove 30. The other end of the press rod 25 is provided with a fixing pin through hole 32 that matches the fixing pin 31. The other end of the press rod 25 is installed in the second press rod mounting groove 30 through the cooperation of the fixing pin through hole 32 and the fixing pin 31 and is rotatably connected thereto.

[0036] On the first press rod mounting groove 28, there is a first limiting plate 36 that matches one end of the press rod 25. On the second press rod mounting groove 30, there is a second limiting plate 37 that matches the other end of the press rod 25. In the natural state, the first limiting plate 36 is located below one end of the press rod 25 for resisting the press rod 25, and the second limiting plate 37 is located below the other end of the press rod 25 for resisting the pressing block 26.

[0037] The pressing block 26 is provided with a friction layer 33 (rubber), and the friction layer 33 is located on the surface of the pressing block 26 that contacts the rotating shaft 24.

[0038] On the outer side wall of the turntable 22, there is an annular flange 34. On the inner side wall of the cover plate through hole 21, there is a flange mounting groove 35 that matches the annular flange 34. The turntable 22 is installed on the inner side of the cover plate through hole 21 through the cooperation of the annular flange 34 and the flange mounting groove 35 and is rotatably connected thereto. To enable the turntable 22 to rotate smoothly with the rotating shaft 24, it can be known that lubricating oil is applied to the contact surface between the flange mounting groove 35 and the annular flange 34.

[0039] The shape of the cover plate when the motor body is not installed in the motor housing is as Figure 7 shown.

[0040] Working principle: When the motor body 1 generates vibration during operation, through the material characteristics of the damping cup 3 (rubber) and the cooperation of the first buffer spring 5 and the buffer liquid 10 in the buffer cavity 4, the vibration can be buffered, effectively preventing the vibration generated during the operation of the motor body 1 from being transmitted to the external motor housing 2. The buffer liquid 10 can, on the one hand, further buffer the vibration generated during the operation of the motor body 1, and on the other hand, can also offset part of the elastic force when the first buffer spring 5 rebounds.

[0041] The pressing plate 13 on the pressing column 12 presses on the motor body 1 under the elastic force of the second buffer spring 14, thereby fixing the motor body 1 inside the damping cup 3. Moreover, the vibration generated when the motor body 1 operates can also be buffered by the second buffer spring 14. When the pressing column 12 and the damping slide plate 19 vibrate synchronously with the vibration generated when the motor body 1 operates, the damping force formed by the friction between the hole wall of the damping through hole 20 and the damping liquid 16 and the internal friction between the damping liquid molecules not only further damps and buffers the vibration transmitted from the motor body 1 to the pressing column 12, but also can offset part of the elastic force when the second buffer spring 14 rebounds.

[0042] The pressing rod 25 on the turntable 22 presses the pressing block 26 against the side wall of the rotating shaft 24. When the rotating shaft 24 rotates, under the action of the frictional force between the pressing block 26 and the side wall of the rotating shaft 24, it will drive the turntable 22 to rotate together with the rotating shaft 24. At this time, the heat dissipation fins 27 on all the pressing blocks 26 also rotate together with the rotating shaft 24, forming a heat dissipation fan to conduct air-cooled heat dissipation on the motor body 1 inside the motor housing 2, and discharging the heat generated when the motor body 1 operates out of the motor housing 2 through the first heat dissipation through hole 7 and the second heat dissipation through hole 8 in sequence. One end of the pressing rod 25 is installed in the first pressing rod installation groove 28 through a coil spring 29. On the one hand, it can tightly press the pressing block 26 on the pressing rod 25 against the side wall of the rotating shaft 24, and on the other hand, it can avoid the direct contact between the pressing rod 25 and the turntable 22, preventing the vibration of the rotating shaft 24 from being transmitted to the cover plate 6.

Claims

1. A coreless motor capable of reducing vibration, characterized in that, It includes a motor body (1) and a motor housing (2). Inside the motor housing (2), there is a damping cup (3). The motor body (1) is installed inside the damping cup (3). The material of the damping cup (3) is a flexible material. Inside the damping cup (3), there is a buffer cavity (4). The buffer cavity (4) is located outside the motor body (1). Inside the buffer cavity (4), several first buffer springs (5) are installed. One end of the first buffer spring (5) is fixed on the side wall of the buffer cavity (4) close to the motor body (1), and the other end of the first buffer spring (5) is fixed on the side wall of the buffer cavity (4) close to the motor housing (2). On the motor housing (2), there is a cover plate (6). The cover plate (6) is installed at the opening of the damping cup (3). On the cover plate (6), there is a buffer pressing device matching the motor body (1). On the side wall and the bottom surface of the damping cup (3), there are several first heat dissipation through holes (7). On the side wall and the bottom surface of the motor housing (2), there are second heat dissipation through holes (8) corresponding to the first heat dissipation through holes (7). On the cover plate (6), there is a cover plate through hole (21). Inside the cover plate through hole (21), there is a turntable (22). The turntable (22) is rotatably connected to the cover plate (6). On the turntable (22), there is a turntable through hole (23). On the motor body (1), there is a rotating shaft (24). The rotating shaft (24) is located inside the turntable through hole (23). Inside the turntable through hole (23), there are also several pressure rods (25). The pressure rods (25) are annularly distributed outside the rotating shaft (24). One end of the pressure rod (25) is installed on the inner wall of the turntable through hole (23) and is rotatably connected thereto. The other end of the pressure rod (25) is provided with a pressure block (26). One side of the pressure block (26) is placed on the side wall of the rotating shaft (24) and is in damping contact therewith. On the other side of the pressure block (26), there are heat dissipation fins (27).

2. The hollow cup motor capable of reducing vibration according to claim 1, characterized in that, On the inner wall and the inner bottom surface of the motor housing (2), there are several heat dissipation grooves (9). The second heat dissipation through holes (8) are located on the bottom surfaces of the heat dissipation grooves (9).

3. The hollow cup motor capable of reducing vibration according to claim 1, characterized in that, Inside the buffer cavity (4), there is buffer liquid (10). On the side wall of the buffer cavity (4), there is a buffer liquid injection and discharge port (38).

4. A coreless motor capable of reducing vibration according to claim 1, characterized in that The motor housing (2) and the cover plate (6) are threadedly connected. The buffer pressing device includes a fixed block (11) fixed on the cover plate (6). The fixed block (11) is placed on the side of the cover plate (6) facing the motor body (1). The fixed block (11) is located inside the opening of the damping cup (3). On the fixed block (11), there is a pressure column (12). One end of the pressure column (12) is installed on the fixed block (11) and is movably connected thereto. The other end of the pressure column (12) faces the motor body (1) and a pressure plate (13) is fixed thereon. Between the pressure plate (13) and the fixed block (11), there is a second buffer spring (14) connecting them.

5. The hollow cup motor capable of reducing vibration according to claim 4, wherein The interior of the fixed block (11) is provided with a fixed block cavity (15). A damping liquid (16) is arranged in the fixed block cavity (15). A plunger through-hole (17) matching the plunger (12) is arranged on the side wall of one side of the fixed block cavity (15). One end of the plunger (12) passes through the plunger through-hole (17) and is placed in the fixed block cavity (15) and is in sealed sliding connection with it. A top block (18) matching one end of the plunger (12) is fixed on the side wall of one side of the fixed block cavity (15). A damping slide plate (19) is arranged on the side wall of the plunger (12). The damping slide plate (19) is placed in the fixed block cavity (15) and is in sliding connection with it. A damping through-hole (20) is arranged on the damping slide plate (19).

6. The hollow cup motor capable of reducing vibration according to claim 1, characterized in that, A first pressure rod mounting groove (28) matching one end of the pressure rod (25) is arranged on the inner wall of the turntable through-hole (23). One end of the pressure rod (25) is placed in the first pressure rod mounting groove (28). One end of the pressure rod (25) and the inner wall of the first pressure rod mounting groove (28) are connected by a coil spring (29). A second pressure rod mounting groove (30) matching the other end of the pressure rod (25) is arranged on the pressure block (26). A fixing pin (31) is arranged in the second pressure rod mounting groove (30). A fixing pin through-hole (32) matching the fixing pin (31) is arranged at the other end of the pressure rod (25). The other end of the pressure rod (25) is installed in the second pressure rod mounting groove (30) through the cooperation of the fixing pin through-hole (32) and the fixing pin (31) and is in rotational connection with it.

7. A coreless motor capable of reducing vibration according to claim 1, characterized in that, A friction layer (33) is arranged on the pressure block (26). The friction layer (33) is located on the surface of the pressure block (26) in contact with the rotating shaft (24).

8. A coreless motor capable of reducing vibration according to claim 1, characterized in that, An annular flange (34) is arranged on the outer side wall of the turntable (22). A flange mounting groove (35) matching the annular flange (34) is arranged on the inner side wall of the cover plate through-hole (21). The turntable (22) is installed on the inner side of the cover plate through-hole (21) through the cooperation of the annular flange (34) and the flange mounting groove (35) and is in rotational connection with it.

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