Load test tool for harmonic flexible gear

Abstract

The utility model discloses a load testing tool for a harmonic flexible gear, which relates to the technical field of flexible gear testing and comprises a load connecting assembly, a harmonic flexible gear assembly and a cam transmission assembly. The harmonic flexible gear assembly comprises a flexible gear connected to one side of the load connecting assembly, a crossed roller bearing and a rigid gear, wherein the outer circumference of the flexible gear is sleeved with the crossed roller bearing and the rigid gear, and the flexible gear is in meshing transmission connection with the rigid gear. The cam transmission assembly comprises a servo motor with one end located in the flexible gear, a cam arranged on an output shaft of the servo motor in a sleeving mode and a flexible bearing arranged on the outer circumference of the cam in a sleeving mode, and the outer ring of the flexible bearing is suitable for being rotationally supported on the inner circumference of the flexible gear. A motor connecting flange is further connected between the servo motor and the rigid wheel in a sleeved mode so that the rigid wheel can be fixedly connected to a shell of the servo motor. According to the utility model, by optimizing the structure, the flexible gear output torque of the cap-type harmonic speed reducer is realized, and the load capacity and the impact resistance of the speed reducer can be conveniently tested.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission, in particular to a load testing tool for a harmonic flexible wheel. Background Art

[0002] Hat-type harmonic reducer is a kind of reduction device widely used in the field of mechanical transmission. The performance and quality of hat-type harmonic reducer have an important influence on the operation stability and reliability of mechanical equipment. Therefore, in the production process, load testing of hat-type harmonic reducer is an indispensable link.

[0003] In the prior art, due to the unique structure of the hat-type harmonic reducer, in the output load test of the hat-type harmonic reducer flexspline, the flexspline end of the hat-type harmonic reducer is inconvenient to install, and various performance indicators of the reducer cannot be detected. Utility Model Content

[0004] The main purpose of the utility model is to provide a load testing tool for a harmonic flexspline, aiming to solve the technical problems that the flexspline end of the existing harmonic reducer is inconvenient to install and various performance indicators of the reducer cannot be detected.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a load test tool for a harmonic flexible pulley, comprising:

[0006] Load connection components;

[0007] A harmonic flexwheel assembly comprises a flexwheel connected to one side of the load connection assembly, and a cross roller bearing and a rigid wheel sleeved on the outer circumference of the flexwheel, wherein the outer teeth of the flexwheel are meshed and transmission-connected with the inner teeth of the rigid wheel;

[0008] A cam transmission assembly, comprising a servo motor with one end located in the flexible wheel, a cam sleeved on the output shaft of the servo motor, and a flexible bearing sleeved on the outer circumference of the cam, wherein the outer ring of the flexible bearing is suitable for rotatably supporting on the inner circumference of the flexible wheel, and the center line of the output shaft of the servo motor coincides with the center axis of the flexible wheel;

[0009] A motor connecting flange is sleeved and connected between the servo motor and the rigid wheel, so that the rigid wheel is fixedly connected to the housing of the servo motor.

[0010] Optionally, the cam transmission assembly also includes a cam baffle connected to the cam and the output shaft of the servo motor, the first outer stop of the cam is suitable for being inserted into the first inner stop of the cam baffle, and the cam baffle and the output shaft of the servo motor are fixedly connected via a first connecting member, and the cam baffle and the cam are fixedly connected via a plurality of second connecting members evenly distributed in annular shapes.

[0011] Optionally, the load connection assembly includes a load connection flange connected to the side of the flexible wheel away from the cam transmission assembly and a load swing arm connected to the load connection flange on the side of the flexible wheel away from the load swing arm, a second outer stop is provided on the side of the load connection flange close to the load swing arm, and a first through hole is provided on the load swing arm opposite to the second outer stop, and the second outer stop of the load connection flange is suitable for being inserted into the first through hole of the load swing arm.

[0012] Optionally, the harmonic flexwheel assembly further includes a first locking member horizontally connected between the flexible bearing, the flexwheel and the load connection flange, and a second locking member horizontally connected between the flexwheel and the flexible bearing.

[0013] Optionally, the flexible wheel comprises a flange section and a barrel section coaxially connected in sequence, the flange section has an outer diameter equal to that of the cross roller bearing, and the sum of the lengths between the cross roller bearing and the rigid wheel is equal to the length of the barrel section.

[0014] Optionally, a second inner stop is further provided on one side of the flange section of the load connection flange close to the flexible wheel, the flange section is suitable for being inserted into the second inner stop, and the second inner stop extends to the outer circumference of the cross roller bearing.

[0015] Optionally, the rigid wheel comprises an integrally connected rigid wheel body and a boss, the rigid wheel body is provided with a first internal tooth, the cylinder section is provided with a first external tooth meshing with the first internal tooth near the first internal tooth, and the boss is suitable for being inserted into the inner hole of the cross roller bearing.

[0016] Optionally, a third inner stop is provided on a side of the motor connection flange close to the rigid wheel, and the rigid wheel is suitable for being inserted into the third inner stop.

[0017] Optionally, the motor connecting flange is fixedly connected via an L bracket, a third outer stop is provided on a side of the motor connecting flange away from the rigid wheel, and the third outer stop is suitable for being inserted into an inner hole of the motor connecting flange.

[0018] Optionally, the rigid wheel and the cross roller bearing are fixedly connected via a plurality of evenly distributed third locking members.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0020] In the technical scheme of the utility model, a load test tool for a harmonic flexible wheel is composed of a load connection component, a harmonic flexible wheel component and a cam transmission component, wherein the load connection component is used as a load loaded on the output end of the harmonic flexible wheel component to test the load and life of the reducer; the harmonic flexible wheel component is composed of a flexible wheel, a cross roller bearing and a rigid wheel, one side of the flexible wheel is connected and fixed by the load connection component, a cross roller bearing and a rigid wheel are sleeved on the outer circumference of the flexible wheel, and the outer teeth of the flexible wheel are meshed and connected with the inner teeth of the rigid wheel to realize harmonic flexible wheel transmission; the cam transmission component is composed of a servo motor, a cam and a flexible bearing, one end of the servo motor is located in the flexible wheel, the cam is sleeved on the output shaft of the servo motor, the flexible bearing is sleeved on the outer circumference of the cam, the outer ring of the flexible bearing is suitable for rotation support on the inner circumference of the flexible wheel, and the center line of the output shaft of the servo motor coincides with the center axis of the flexible wheel. It adopts two-stage transmission, and through the coordinated transmission between the cam transmission component and the harmonic flexible wheel component, the load connection component is connected to the flexible wheel and the cross roller bearing, the rigid wheel is connected to the cross roller bearing, and the rigid wheel is connected to the motor connection flange, so as to achieve the coaxiality between the reducer and the test fixture. By referring to the actual working conditions and optimizing the structure, the fixture is more convenient and quick, the assembly coaxiality is high, and the test is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the internal cross-sectional structure of an embodiment of a load testing tool for a harmonic flexible pulley provided in an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the harmonic flexible wheel assembly provided in the embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the cam transmission assembly provided in an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the structure of the load connection assembly provided in an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1- Load connection components;

[0028] 11- load swing arm; 111- first through hole; 12- load connection flange; 121- second inner stop; 122- second outer stop;

[0029] 2- Harmonic flexwheel assembly;

[0030] 21-flexible wheel; 211-flange section; 212-cylinder section; 2121-first external tooth;

[0031] 22- Cross roller bearing;

[0032] 23-rigid wheel; 231-rigid wheel body; 2311-first inner tooth; 232-boss;

[0033] 24-first connecting member; 25-second connecting member;

[0034] 3- Cam transmission assembly;

[0035] 31-servo motor; 311-motor connection flange; 3111-third inner stop; 3112-third outer stop; 312-L bracket;

[0036] 32- cam; 321- first outer stop;

[0037] 33- cam baffle; 331- first inner stop;

[0038] 34-Flexible bearing;

[0039] 4-first locking piece; 5-second locking piece; 6-third locking piece. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0043] In the prior art, the load test fixture for harmonic flexible wheels cannot achieve higher bending moment and torque than the traditional load test fixture for harmonic flexible wheels, and the traditional load test fixture structure for harmonic flexible wheels is a primary structure, and the speed ratio is basically below 200. Since the input and output are coaxial, there are very high installation requirements during the installation process; for requirements for speed ratios above 200, high torque, and high bending moment, traditional reducers cannot meet these requirements.

[0044] In order to solve the above technical problems, the utility model provides a load test tool for a harmonic flexible pulley. Figure 1-4 The figure shows an embodiment of a load test tool for a harmonic flexible wheel provided by the utility model. The load test tool for a harmonic flexible wheel comprises a load connection component 1, a harmonic flexible wheel component 2 and a cam transmission component 3, wherein:

[0045] The load connection component 1 is used to realize the load test of the harmonic flexible wheel component 2; the harmonic flexible wheel component 2 includes a flexible wheel 21, a cross roller bearing 22 and a rigid wheel 23, the flexible wheel 21 is connected to one side of the load connection component 1, the cross roller bearing 22 and the rigid wheel 23 are sleeved on the outer circumference of the flexible wheel 21, and the outer teeth of the flexible wheel 21 are meshed and connected with the inner teeth of the rigid wheel 23; the cam transmission component 3 includes a servo motor 31 with one end located in the flexible wheel 21, a cam 32 sleeved on the output shaft of the servo motor 31 and a flexible bearing 34 sleeved on the outer circumference of the cam 32, the outer ring of the flexible bearing 34 is suitable for rotation support on the inner circumference of the flexible wheel 21, and the center line of the output shaft of the servo motor 31 coincides with the center axis of the flexible wheel 21; a motor connection flange 311 is also sleeved and connected between the servo motor 31 and the rigid wheel 23, so that the rigid wheel 23 is fixedly connected to the outer shell of the servo motor 31.

[0046] See also Figure 1 As shown, in a specific scheme of the present utility model, the load testing tool for the harmonic flexible wheel is composed of a load connection component 1, a harmonic flexible wheel component 2 and a cam transmission component 3, wherein the load connection component 1 is used as a load loaded on the output end of the harmonic flexible wheel component 2 to test the load and life of the reducer.

[0047] The harmonic flexwheel assembly 2 is composed of a flexwheel 21, a cross roller bearing 22 and a rigid wheel 23. One side of the flexwheel 21 is connected and fixed by a load connection assembly 1. The cross roller bearing 22 and the rigid wheel 23 are sleeved on the outer circumference of the flexwheel 21, and the outer teeth of the flexwheel 21 are meshed and connected with the inner teeth of the rigid wheel 23 to realize harmonic flexwheel transmission.

[0048] The cam transmission assembly 3 is composed of a servo motor 31, a cam 32 and a flexible bearing 34. One end of the servo motor 31 is located in the flexible wheel 21. The cam 32 is sleeved on the output shaft of the servo motor 31. The flexible bearing 34 is sleeved on the outer circumference of the cam 32. The outer ring of the flexible bearing 34 is suitable for rotation support on the inner circumference of the flexible wheel 21, and the center line of the output shaft of the servo motor 31 coincides with the center axis of the flexible wheel 21.

[0049] Therefore, this embodiment adopts a two-stage transmission, and through the coordinated transmission between the cam transmission component 3 and the harmonic flexible wheel component 2, the load connection component 1 is connected to the flexible wheel 21 and the cross roller bearing 22, the rigid wheel 23 is connected to the cross roller bearing 22, and the rigid wheel 23 is further connected to the motor connection flange 311, so as to achieve the coaxiality between the reducer and the test fixture. By referring to the actual working conditions, the structure is optimized to make the fixture more convenient and quick; it is characterized by easy installation, high assembly coaxiality, and accurate testing.

[0050] At the same time, the harmonic flexible wheel assembly 2 has the characteristics of small friction coefficient, low noise, low vibration and good stability. Therefore, by setting the meshing connection between the flexible wheel 21 and the rigid wheel 23, the load test tooling for the harmonic flexible wheel can operate more smoothly and stably, and the noise can be further reduced.

[0051] It should be particularly noted that the cross roller bearing 22 has good rotation accuracy, is easy to install, can withstand large axial and radial loads, can greatly save installation space, and ensures high coaxiality between the reducer and the test fixture.

[0052] Furthermore, the cam transmission assembly 3 also includes a cam baffle 33 connected to the cam 32 and the output shaft of the servo motor 31, the first outer stop 321 of the cam 32 is suitable for being inserted into the first inner stop 331 of the cam baffle 33, and the cam baffle 33 and the output shaft of the servo motor 31 are fixedly connected via a first connecting member 24, and the cam baffle 33 and the cam 32 are fixedly connected via a plurality of annularly evenly distributed second connecting members 25.

[0053] Specifically, see Figure 3As shown, in the specific scheme of the utility model, the cam 32 in this embodiment is installed on the output shaft of the servo motor 31 through a key connection. In order to avoid the shaking of the cam 32 during the rotation process, a first outer stop 321 is provided at the outer end of the cam 32, and the end face of the first outer stop 321 is flush with the output shaft of the servo motor 31. A first inner stop 331 is provided on one side of the cam baffle 33. The first outer stop 321 is inserted into the first inner stop 331 to achieve radial positioning of the cam 32, and is locked and fixed by the first connecting piece 24 at the center position of the end, and is evenly connected and fixed by the second connecting piece 25 in an annular manner, to ensure that the cam 32 will not have axial movement in the axial direction of the output shaft, thereby improving the movement stability of the load test tooling for the harmonic flexible wheel.

[0054] Furthermore, the load connection assembly 1 includes a load connection flange 12 connected to the side of the flexible wheel 21 away from the cam transmission assembly 3 and a load swing arm 11 connected to the side of the load connection flange 12 away from the flexible wheel 21. A second outer stop 122 is provided on the side of the load connection flange 12 close to the load swing arm 11, and a first through hole 111 is provided at the load swing arm 11 opposite to the second outer stop 122. The second outer stop 122 of the load connection flange 12 is suitable for being inserted into the first through hole 111 of the load swing arm 11.

[0055] Specifically, see Figure 4 As shown, in a specific solution of the present utility model, the load connection assembly 1 is composed of a load connection flange 12 and a load swing arm 11, wherein the load connection flange 12 is used to connect and install the flexible wheel 21, and one side of the load connection flange 12 is matched and positioned with the first through hole 111 of the load swing arm 11 through a second outer stop 122 provided.

[0056] Furthermore, the harmonic flexwheel assembly 2 further includes a first locking member 4 horizontally connected between the cross roller bearing 22 , the flexwheel 21 and the load connection flange 12 , and a second locking member 5 horizontally connected between the flexwheel 21 and the flexible bearing 34 .

[0057] Specifically, see Figure 1 As shown, in the specific scheme of the utility model, in order to realize the fixed connection between the load connection flange 12, the flexible wheel 21 and the cross roller bearing 22, a plurality of evenly distributed first locking members 4 are arranged along the right end face of the cross roller bearing 22 parallel to the central axis of the flexible wheel 21, and the cross roller bearing 22, the flexible wheel 21 and the load connection flange 12 are completely locked by the first locking members 4.

[0058] Furthermore, the flexible wheel 21 includes a flange section 211 and a cylinder section 212 which are coaxially connected in sequence. The outer diameter of the flange section 211 is equal to that of the cross roller bearing 22 , and the sum of the lengths between the cross roller bearing 22 and the rigid wheel 23 is equal to the length of the cylinder section 212 .

[0059] Specifically, see Figure 2 As shown, in the specific solution of the utility model, the flexible wheel 21 is integrally formed by a flange section 211 and a cylinder section 212. By setting reasonable dimensions, the rigid wheel 23 and the flexible wheel 21 are fully engaged, and the axis can be limited to each other.

[0060] Furthermore, a second inner stop 121 is provided on one side of the flange section 211 of the load connection flange 12 close to the flexible wheel 21 . The flange section 211 is suitable for being inserted into the second inner stop 121 , and the second inner stop 121 extends to the outer circumference of the cross roller bearing 22 .

[0061] Specifically, see Figure 4 As shown, in a specific solution of the present utility model, the simultaneous connection with the load swing arm 11 and the flexible wheel 21 is achieved through the inner and outer stoppers of the load connecting flange 12 .

[0062] Furthermore, the rigid wheel 23 includes an integrally connected rigid wheel body 231 and a boss 232, the rigid wheel body 231 is provided with a first inner tooth 2311, the barrel section 212 is provided with a first outer tooth 2121 meshing with the first inner tooth 2311 near the first inner tooth 2311, and the boss 232 is suitable for being inserted into the inner hole of the cross roller bearing 22.

[0063] Specifically, see Figure 2 As shown, in the specific scheme of the utility model, the rigid wheel 23 is composed of an integrally connected rigid wheel body 231 and a boss 232, and is inserted into the inner hole of the cross roller bearing 22 through the boss 232 to achieve radial positioning and ensure that the first outer teeth 2121 of the barrel section 212 are fully meshed with the first inner teeth 2311.

[0064] Furthermore, a third inner stop 3111 is provided on the side of the motor connecting flange 311 close to the rigid wheel 23, and the rigid wheel 23 is suitable for being inserted into the third inner stop 3111. In this embodiment, the right end face of the rigid wheel 23 is limited and fixed by the third inner stop 3111.

[0065] Furthermore, the motor connecting flange 311 is fixedly connected via an L bracket 312 , and a third outer stop 3112 is provided on the side of the motor connecting flange 311 away from the rigid wheel 23 , and the third outer stop 3112 is suitable for being inserted into the inner hole of the motor connecting flange 311 .

[0066] See also Figure 2 As shown, the rigid wheel 23 and the cross roller bearing 22 are fixedly connected via a plurality of evenly distributed third locking members 6 .

[0067] In the load test fixture for harmonic flexible pulleys of the present invention, the load connecting flange 12 is connected to the flexible pulley 21 and the cross roller bearing 22, the rigid pulley 23 is connected to the cross roller bearing 22, and the rigid pulley 23 is further connected to the motor connecting flange 311, thereby achieving coaxiality between the reducer and the test fixture.

[0068] The test fixture has a reasonable structure and can realize the output torque of the flexible wheel 21 in the cap-type harmonic reducer, and can conveniently test the load capacity and impact resistance of the reducer.

[0069] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A load test tool for a harmonic flexible pulley, characterized in that: include: Load connection assembly (1); A harmonic flexwheel assembly (2) comprises a flexwheel (21) connected to one side of the load connection assembly (1), and a cross roller bearing (22) and a rigid wheel (23) sleeved on the outer circumference of the flexwheel (21), wherein the external teeth of the flexwheel (21) are meshed and transmission-connected with the internal teeth of the rigid wheel (23); A cam transmission assembly (3) comprises a servo motor (31) with one end located inside the flexible wheel (21), a cam (32) sleeved on the output shaft of the servo motor (31), and a flexible bearing (34) sleeved on the outer circumference of the cam (32), wherein the outer ring of the flexible bearing (34) is suitable for being rotatably supported on the inner circumference of the flexible wheel (21), and the center line of the output shaft of the servo motor (31) coincides with the center axis of the flexible wheel (21); A motor connection flange (311) is sleeved and connected between the servo motor (31) and the rigid wheel (23), so that the rigid wheel (23) is fixedly connected to the outer shell of the servo motor (31).

2. The load testing tool for harmonic flexible pulley according to claim 1, characterized in that: The cam transmission assembly (3) further comprises a cam baffle (33) connected to the cam (32) and the output shaft of the servo motor (31); the first outer stop (321) of the cam (32) is suitable for being inserted into the first inner stop (331) of the cam baffle (33); the cam baffle (33) and the output shaft of the servo motor (31) are fixedly connected via a first connecting member (24); and the cam baffle (33) and the cam (32) are fixedly connected via a plurality of second connecting members (25) evenly distributed in an annular shape.

3. The load testing tool for harmonic flexible pulley according to claim 2, characterized in that: The load connection assembly (1) comprises a load connection flange (12) connected to a side of the flexible wheel (21) away from the cam transmission assembly (3) and a load swing arm (11) connected to a side of the load connection flange (12) away from the flexible wheel (21); a second outer stop (122) is provided on a side of the load connection flange (12) close to the load swing arm (11); a first through hole (111) is provided on the load swing arm (11) facing the second outer stop (122); and the second outer stop (122) of the load connection flange (12) is suitable for being inserted into the first through hole (111) of the load swing arm (11).

4. The load testing tool for harmonic flexible pulley according to claim 3, characterized in that: The harmonic flexwheel assembly (2) further comprises a first locking member (4) horizontally connected between the cross roller bearing (22), the flexwheel (21) and the load connection flange (12), and a second locking member (5) horizontally connected between the flexwheel (21) and the flexible bearing (34).

5. The load testing tool for harmonic flexible pulley according to claim 4, characterized in that: The flexible wheel (21) comprises a flange section (211) and a barrel section (212) which are coaxially connected in sequence, the outer diameter of the flange section (211) is equal to the outer diameter of the cross roller bearing (22), and the sum of the lengths between the cross roller bearing (22) and the rigid wheel (23) is equal to the length of the barrel section (212).

6. The load testing tool for harmonic flexible pulley according to claim 5, characterized in that: A second inner stop (121) is also provided on one side of the load connection flange (12) close to the flange section (211) of the flexible wheel (21), the flange section (211) is suitable for being inserted into the second inner stop (121), and the second inner stop (121) extends to the outer circumference of the cross roller bearing (22).

7. The load testing tool for harmonic flexible pulley according to claim 6, characterized in that: The rigid wheel (23) comprises an integrally connected rigid wheel body (231) and a boss (232); the rigid wheel body (231) is provided with a first internal tooth (2311); the barrel section (212) is provided with a first external tooth (2121) meshing with the first internal tooth (2311) near the first internal tooth (2311); and the boss (232) is suitable for being inserted into the inner hole of the cross roller bearing (22).

8. The load testing tool for harmonic flexible pulley according to claim 7, characterized in that: A third inner stop (3111) is provided on one side of the motor connection flange (311) close to the rigid wheel (23), and the rigid wheel (23) is suitable for being inserted into the third inner stop (3111).

9. The load testing tool for harmonic flexible pulley according to claim 8, characterized in that: The motor connection flange (311) is fixedly connected via an L bracket (312), and a third outer stop (3112) is provided on a side of the motor connection flange (311) away from the rigid wheel (23), and the third outer stop (3112) is suitable for being inserted into the inner hole of the motor connection flange (311).

10. The load testing tool for a harmonic flexible pulley according to any one of claims 1 to 9, characterized in that: The rigid wheel (23) and the cross roller bearing (22) are fixedly connected via a plurality of evenly distributed third locking members (6).

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