Overrunning clutch, driving device and driving method

Abstract

The invention provides an overrun clutch, a driving device and a driving method.The overrun clutch comprises a driving disc, a retainer, an outer ring, an elastic assembly and a driving assembly; a plurality of working surfaces are circumferentially arrayed on the outer wall of the driving disc, and a group of rollers are placed on each group of working surfaces; the retainer is arranged on the driving disc in a sleeving manner, and accommodating positions for placing each group of rollers are arranged on the retainer; the outer ring is coaxially arranged on the peripheral side of the driving disc; the rollers are contacted with the outer ring on the side of the working surface and separated from the outer ring in the middle of the working surface; the elastic assembly is connected between the driving disc and the retainer to drive the rollers to be kept in the middle of the working surface; the driving assembly acts on the retainer and can block the retainer when the inner ring rotates, so that the driving disc and the retainer are staggered; compared with a traditional overrunning clutch, the overrunning clutch is light in weight, the driving device is integrated with the overrunning clutch, working reliability is high, and the overrunning clutch can be used for driving aircraft sliding tires.

Description

Technical Field

[0001] The present invention relates to the field of mechanical transmission, and more particularly, to an overrunning clutch, a driving device, and a driving method. Background Art

[0002] In an overrunning clutch, rollers and a cage are arranged between a driving disk and an outer ring. The function of the cage is to change the position of the rollers on the working surface of the driving disk so that the rollers can contact the outer ring at some times. Among them, the state in which the outer ring and the driving disk are connected by the rollers and move synchronously is called the engaged state of the overrunning clutch, and the state in which the outer ring and the rollers are out of contact is called the overrunning state of the overrunning clutch.

[0003] Referring to a two-way overrunning clutch relay device disclosed in Patent CN103089847B, the specific implementation manner in paragraph

[0030] introduces that the change of the above two states in a traditional overrunning clutch depends on the speed difference between the outer ring and the driving disk (which it calls the star wheel). That is, when the speed of the outer ring is greater than the speed of the driving disk, the rollers are located in the middle of the working surface, and the clutch is in the overrunning state; in the load state, the outer ring generates a static friction force on the cage (which it calls the middle ring). At this time, the speed of the driving disk started is greater than the speeds of the outer ring and the cage, and the cage and the driving disk generate a misaligned rotation, causing the position of the rollers to change, and then the clutch enters the engaged state. The speed difference between the cage and the driving disk needs to use the friction force generated by the external load on the cage to block. The clutch may fail when entering the engaged state without load, and the reliability is low, and the use scenario is limited.

[0004] To solve the above problems, the cage structures of some overrunning clutches are relatively large in size or use high-density materials to increase the mass and inertia of the cage, so as to generate a suitable misaligned rotation between the cage and the driving disk when the driving disk rotates. Although the structure of such an overrunning clutch can achieve the function of the engaged state, the structure is heavy and is prone to failure in environments such as high and low temperatures, impacts, and vibrations, and its reliability is low.

[0005] In view of this, it is necessary to improve the above-mentioned overrunning clutch. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the background art and provide an overrunning clutch, a driving device, and a driving method.

[0007] The embodiments of the present invention are realized through the following technical solutions:

[0008] In a first aspect, the present invention provides an overrunning clutch, including:

[0009] A driving disk, on the outer wall of which a plurality of working surfaces are circumferentially arranged in an array, and a set of rollers are placed on each set of the working surfaces;

[0010] A cage is sleeved on the driving disk, and accommodation positions for placing each group of the rollers are arranged on the cage; by the misaligned rotation of the driving disk and the cage, the positions of the rollers on the working surface are variable;

[0011] An outer ring is coaxially arranged on the outer peripheral side of the driving disk; the rollers are in contact with the outer ring when at the side of the working surface, and are separated from the outer ring when at the middle of the working surface;

[0012] An elastic component is connected between the driving disk and the cage to drive the rollers to stay at the middle of the working surface; and

[0013] A driving component acts on the cage and can generate a block on the cage when the driving disk rotates, so that the driving disk and the cage are misaligned.

[0014] In a more optimal solution, a plurality of convex portions are arranged on the outer wall of the driving disk; the elastic component includes springs arranged on both sides of each group of the convex portions;

[0015] The springs abut between the convex portions and the cage to drive the cage to push the rollers to stay at the middle of the working surface.

[0016] In a more optimal solution, the driving component includes:

[0017] A first friction member;

[0018] A second friction member is connected to the cage through an elastic element to drive the second friction member to separate from the first friction member; and

[0019] An electromagnetic component is arranged on the same side of the first friction member to adsorb the second friction member to make the second friction member contact with the first friction member.

[0020] In a more optimal solution, an inner ring coaxially arranged in the outer ring is further included, and the driving disk is rotatably sleeved on the inner ring; the electromagnetic component and the first friction member are both arranged on the inner ring.

[0021] In a second aspect, the present invention further provides a driving device, including a motor, a speed reducer and the overrunning clutch as described above, wherein the motor is connected to the input end of the speed reducer, and the driving disk is connected to the output end of the speed reducer.

[0022] In a more optimal solution, the motor includes a rotor and a stator;

[0023] The rotor is rotatably sleeved on the inner ring, the stator is arranged on the outer peripheral side of the rotor, and the stator is fixed on the inner ring; the input end of the speed reducer is connected to the rotor.

[0024] In a more optimal solution, the speed reducer is a planetary gear speed reducer with few teeth difference, a cycloidal pinwheel speed reducer or a harmonic gear speed reducer.

[0025] In a more optimal solution, the speed reducer includes a ring gear and a planetary gear;

[0026] The inner circumferential surface of the ring gear is a toothed surface, and the ring gear is fixedly arranged on the stator;

[0027] An eccentric outer circle is arranged on the rotor, the planetary gear is sleeved on the eccentric outer circle, and the planetary gear and the ring gear are meshed to form a pair of planetary gear pairs with few teeth difference;

[0028] Among the planetary gear and the driving disc, a plurality of pin shafts are arranged around the axis of any one of them, and the other one is provided with through holes corresponding to the plurality of pin shafts one by one around its axial direction, so that the planetary gear and the driving disc form a parallelogram output mechanism through the pin shafts.

[0029] In a more optimal solution, the inner ring has opposite first end and second end in the axial direction;

[0030] Wherein, a first blocking part is arranged on the outer side wall of the first end of the inner ring, and the stator has a second blocking part that is closed and connected to the second end of the inner ring; the outer ring is rotatably sleeved on the first blocking part and the second blocking part;

[0031] A chamber is formed between the inner ring and the outer ring, and both axial ends of the chamber are closed by the first blocking part and the second blocking part; the motor, the speed reducer and the overrunning clutch are all located in the chamber.

[0032] In a third aspect, the present invention also provides a driving method for the driving device as described above:

[0033] Before the motor drives the outer ring to rotate, first make the first friction part contact with the second friction part through the electromagnetic component, so that the roller moves to the side of the working surface through the cage, and the inner ring and the outer ring are connected as a combined state through the roller;

[0034] When the outer ring rotates freely, the electromagnetic component does not work, and the inner ring and the outer ring are in an overrunning state of being disengaged from contact.

[0035] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0036] In the overrunning clutch of the present invention, the driving disc can drive the rotation of the outer ring in both forward and reverse directions; at the same time, when the overrunning clutch changes from the overrunning state to the engaged state, the driving component acts on the cage to cause the misaligned rotation of the cage and the driving disc. Therefore, the cage and the rollers do not need to be made of high-density materials, reducing the structural weight of the overrunning clutch;

[0037] In the driving device of the present invention, a motor, a reducer and the aforementioned overrunning clutch are integrated. Due to the reduced weight of the aforementioned overrunning clutch and the use of the driving component to cause the misaligned rotation of the cage and the driving disc, compared with the traditional overrunning clutch, the overrunning clutch and the driving device of the present invention have higher working reliability under environments such as high and low temperatures, impact loads, and vibrations;

[0038] The driving device of the present invention can be used in the driving occasion of the taxiing tire of the aircraft; when the aircraft is on the ground, the overrunning clutch is in the engaged state by means of the electromagnetic component, and the driving, reverse and steering actions of the aircraft can be driven by the driving device of the present invention; when the aircraft lands and touches the ground, the overrunning clutch is in the overrunning state to avoid the outer ring driving the motor reversely through the overrunning clutch and the reducer, thereby avoiding damage to the motor due to becoming a generator. Brief Description of the Drawings

[0039] Figure 1 is the assembly schematic of the overrunning clutch in the driving device in the embodiment of the present invention Figure 1 ;

[0040] Figure 2 is the front view of the overrunning clutch in the embodiment of the present invention;

[0041] Figure 3 is Figure 1 the enlarged view of part A in

[0042] Figure 4 is the perspective view of the cage in the embodiment of the present invention;

[0043] Figure 5 is the front view of the reducer in the embodiment of the present invention;

[0044] Figure 6 is the perspective view of the planetary gear in the embodiment of the present invention;

[0045] Figure 7 is the perspective view of the driving disc in the embodiment of the present invention;

[0046] Figure 8 is the assembly schematic of the overrunning clutch in the driving device in the embodiment of the present invention Figure 2 ;

[0047] Figure 9 is the perspective view of the driving device in the embodiment of the present invention;

[0048] Icon: 1 - overrunning clutch, 10 - driving disc, 100 - working surface, 101 - protrusion, 11 - outer ring, 12 - cage, 120 - accommodating position, 121 - placing groove, 122 - acting part, 13 - elastic component, 14 - driving component, 140 - electromagnetic component, 141 - first friction part, 142 - second friction part, 143 - elastic element, 15 - roller, 16 - inner ring, 160 - first blocking part, 17 - driven disc, 170 - through hole, 2 - motor, 20 - stator, 21 - rotor, 210 - eccentric outer circle, 22 - housing, 220 - second blocking part, 23 - encoder, 3 - reducer, 30 - gear ring, 31 - planet gear, 32 - pin shaft. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein usually can be arranged and designed in various different configurations.

[0050] The embodiments of the present invention provide an overrunning clutch 1. Refer to Figures 1 to 4 , the overrunning clutch 1 includes main functional parts such as a driving disc 10, an outer ring 11, a cage 12, an elastic component 13, an electromagnetic component 14, and a plurality of rollers 15.

[0051] Among them, refer to Figure 2 , the inner ring of the driving disc 10 is annular, and a plurality of working surfaces 100 are circumferentially arrayed on the outer ring 10 of the driving disc 10, and a set of rollers 15 can be placed on each set of working surfaces 100.

[0052] The outer ring 11 is sleeved outside the driving disc 10. Refer to Figure 2 , when the roller 15 is located in the middle of the working surface 100, there is a certain gap between the roller 15 and the inner wall of the outer ring 11. When the roller 15 moves to both sides of the working surface 100, the roller 15 can simultaneously contact the inner wall of the outer ring 11 and the working surface 100.

[0053] For the design of the working surface 100, it can adopt the planes shown in Figure 2 and Figure 7 , or it can also be an arc surface. When the working surface 100 is an arc surface, the middle of the arc surface is sunken, and both sides extend towards the outer ring 100.

[0054] Among them, Figure 2 and Figure 7 show that the driving disc 10 has eight working surfaces 100, and all eight working surfaces are planes.

[0055] In addition, a cage 12 is also installed between the outer ring 11 and the driving disk 10. Referring to Figure 4 , a plurality of receiving positions 120 equal in number to the number of rollers 15 are arranged in a circumferential array on the cage. A set of rollers 15 can be placed in each receiving position 120. Referring to Figure 2 , one side of the roller 15 close to the axis direction of the driving disk 10 is limited by the working surface 100, one side of the roller 15 far from the axis direction of the driving disk 10 is limited by the outer ring 11, and both sides of the roller 15 in the rotation direction around the axis of the driving disk 10 are limited by the receiving positions 120. When the cage 12 and the driving disk 10 are misaligned due to differential rotation, the roller 15 can be pushed from the middle of the working surface 10 to the side of the working surface 10. At this time, the roller 15 contacts both the outer ring 11 and the driving disk 10 simultaneously.

[0056] In the overrunning clutch 1, when the roller 15 contacts both the driving disk 10 and the outer ring 11 simultaneously, the torque of the driving disk 10 can be transmitted to the outer ring 11 through the roller 15. Therefore, the state in which the roller 15 makes the driving disk 10 and the outer ring 11 rotate synchronously is the engaged state of the overrunning clutch; and the state in which the roller 15 moves to the middle of the working surface 100 so that the outer ring 11 has no driving relationship with the driving disk 10 is the overrunning state of the overrunning clutch 1.

[0057] Referring to Figure 2 , an elastic component 13 is further provided between the driving disk 10 and the cage 12. The elastic component 13 uses its own elastic force to drive the roller 15 to remain in the middle of the working surface 100, so that the overrunning clutch 1 is in the overrunning state.

[0058] Exemplarily, referring to Figure 7 , a set of convex portions 101 is arranged between every two adjacent working surfaces 100 on the driving disk 10. Referring to Figure 2 , the elastic component 13 includes springs arranged on both sides of each set of convex portions 101. Through the relative action of the springs on both sides of each set of convex portions 101, a certain shape is maintained between the cage 12 and the driving disk 10, just making the roller 15 located in the middle of the working surface 100.

[0059] Preferably, a placement groove 121 for placing the elastic component 13 and the convex portion 101 is further provided on the cage 12. The groove width of the placement groove 121 is slightly larger than the width of the convex portion 101, so as to restrict the maximum misalignment rotation angle between the cage 12 and the driving disk 10; when the misalignment rotation between the cage 12 and the driving disk 10 reaches the maximum angle, the overrunning clutch 1 can be in the engaged state.

[0060] To improve the reliability of the operation of the overrunning clutch 1 when changing from the overrunning state to the engaged state, in the embodiment of the present invention, through the action of the aforementioned driving component 14 on the cage 12, when the driving disk 10 rotates, due to the blocking effect formed by the frictional force generated by the driving component 14 on the cage 12, the driving disk 10 and the cage 12 are misaligned, so that the rollers 15 can accurately move to the side of the working surface 100, and the overrunning clutch 1 enters the engaged state.

[0061] Therefore, it is easy to understand that in order to achieve the above functions, the driving component 14 can directly act on the end surface of the cage 12 along the direction parallel to the axis of the driving disk 10. Therefore, the driving component 14 can be various mechanisms capable of realizing linear motion, such as piston cylinders, gas springs and other devices.

[0062] Exemplarily, referring to Figure 3 , in one embodiment, the driving component 14 includes an electromagnetic component 140, a first friction member 141 and a second friction member 142.

[0063] Among them, the second friction member 142 is connected to the cage 12 through an elastic element 143. Under the action of the elastic element 143, the second friction member 142 is pushed to move away from the first friction member 141, so that the second friction member 142 can be separated from the first friction member 141.

[0064] The electromagnetic component 140 is arranged on the same side of the first friction member 141, and its function is to adsorb the second friction member 142, so that the second friction member 142 overcomes the elastic force of the elastic element 143 and contacts the first friction member 141.

[0065] Exemplarily, the elastic element 143 can adopt a spring washer.

[0066] Therefore, before or when the driving disk 10 rotates, the first friction member 141 and the second friction member 142 are brought into contact through the action of the electromagnetic component 140, so as to produce a blocking effect on the cage 12, enabling the overrunning clutch 1 to smoothly enter the engaged state.

[0067] In the product structure of the overrunning clutch 1, there is also an inner ring 16 coaxially arranged inside the outer ring 11, and the driving disk 10 is rotatably sleeved on the inner ring 16. The electromagnetic component 140 and the first friction member 141 are both arranged on the inner ring 16.

[0068] Referring to Figures 5 to 9 , in addition, in the embodiment of the present invention, a driving device is also provided, which includes a motor 2, a reducer 3 and the aforementioned overrunning clutch 1. Among them, the motor 2 is connected to the input end of the reducer 3, and the driving disk 10 is connected to the output end of the reducer 3. By integrating the aforementioned overrunning clutch 1, motor 2 and reducer 3 in the driving device, the integration and miniaturization of the driving device are facilitated, and the use scenarios of the driving device are expanded.

[0069] Exemplarily, in one embodiment, the motor 2 is a servo motor, which can be used in occasions where precise control of the output form of the driving device is required. Among them, the servo motor includes a stator 20, a rotor 21 and an encoder 23.

[0070] Among them, the rotor 21 is rotatably sleeved on the inner ring 16, the stator 20 is arranged on the outer peripheral side of the rotor 21, the stator 20 is fixed together with the housing 22 of the motor, and the encoder 23 precisely controls the rotation amount of the rotor 21 through a closed-loop control system.

[0071] Refer to Figure 8 , the stator 21 and the housing 22 are fixed on the inner ring 16, the input end of the speed reducer 3 is connected to the rotor 21, the output end of the speed reducer 3 is connected to the driving disc 10 in the overrunning clutch 1, and finally the outer ring 11 is used as the output structure of the entire driving device.

[0072] For the speed reducer 3, it is easy to understand that it can adopt a planetary gear speed reducer with few teeth difference or a cycloid gear speed reducer or a harmonic gear speed reducer, and the above speed reducer structures can all be arranged outside the inner ring 16.

[0073] Exemplarily, in one embodiment, refer to Figures 5 to 7 , the speed reducer 3 includes a gear ring 30 and a planetary gear 3.

[0074] Among them, the inner ring surface of the gear ring 30 is a toothed surface, the gear ring 30 is fixed on the stator 20 by screws, one end of the rotor 21 extends into the gear 30, an eccentric outer circle 210 is provided on the rotor 21, the planetary gear 31 is sleeved on the eccentric outer circle 210, and when the rotor 21 rotates, the planetary gear 31 meshes with the gear ring 30 to form a pair of planetary gear pairs with few teeth difference, which can make the planetary gear 31 rotate at a reduced speed while maintaining partial meshing with the gear ring 30.

[0075] That is, the action transmission between the speed reducer 3 and the overrunning clutch 1 depends on the planetary gear 31 and the driving disc 10. Among the planetary gear 31 and the driving disc 10, a plurality of pin shafts 32 are arranged around the axis of any one of them, and the other one is provided with through holes corresponding to the plurality of pin shafts 32 around its own axis, so that the planetary gear 31 and the driving disc 10 form a parallelogram output mechanism through the pin shafts.

[0076] Refer to Figure 6 and Figure 7, for example, in one embodiment, a plurality of pin shafts 32 are disposed around the planetary gear 31, and a driven disk 17 is fixedly installed at the end of the driving disk 10 by screws. Through holes 170 are provided on the driven disk 17 for the foregoing plurality of pin shafts 32 to be inserted therein one by one, and the inner diameter of the through holes 170 is much larger than the diameter of the pin shafts 32. The purpose is to adapt to a certain degree of radial displacement generated by the pin shafts 32 during the synchronous rotation of the planetary gear 31 driving the driving disk 10.

[0077] Referring to Figure 8 , it is defined that the inner ring 16 has opposite first and second ends in the axial direction. Then, a first blocking portion 160 is provided on the outer side wall of the first end of the inner ring 16, and a second blocking portion 220 that is closed and connected to the second end of the inner ring 16 is provided on the structure formed by the stator 20 and the housing 22. The outer ring 11 is rotatably sleeved on the first blocking portion 160 and the second blocking portion 220 to form a cavity between the inner ring 16 and the outer ring 11, and both axial ends of the cavity are closed by the first blocking portion 160 and the second blocking portion 220.

[0078] Among them, the electromagnetic component 140 in the driving component 14 is embedded in the first blocking portion 160.

[0079] The foregoing overrunning clutch 1, motor 2, and reducer 3 are all located in the cavity, so that the overall outer contour of the driving device is as Figure 9 shown, and the entire driving device is wrapped between the inner ring 16 and the outer ring 11.

[0080] In addition, an embodiment of the present invention also provides a driving method for the driving device as described above, that is:

[0081] Before the motor 2 drives the outer ring 11 to rotate through the reducer 3, first make the first friction member 141 contact the second friction member 142 through the electromagnetic component 140, so that the roller 15 moves to the side of the working surface 100 by the misalignment of the cage 12 relative to the driving disk 10, and the inner ring 16 and the outer ring 11 are connected in a combined state through the roller 15.

[0082] When the outer ring 11 rotates freely, the electromagnetic component does not work, and the inner ring 16 and the outer ring 11 are in an overrunning state of being disengaged from contact. At this time, the free rotation of the outer ring 11 will not transmit power to the driving disk 10, thereby avoiding the overrunning clutch 1 transmitting power reversely to the motor 2 through the reducer 3 and preventing the motor 2 from being damaged due to being in a generator state.

[0083] , for example, in one embodiment, about 0.2 s before the motor 2 is powered on, the electromagnetic component 140 is powered on through the control of the upper computer, and the electromagnetic component 140 attracts the second friction member 142 to contact the first friction member 141;

[0084] Then, power is supplied to the motor 2. At this time, since the electromagnetic component 140 causes a resistance torque on the cage 12, the cage 12 is misaligned with the driving disk 10, and the roller 15 moves toward the side of the working surface 100, so that the overrunning clutch 1 smoothly enters the engaged state.

[0085] When about 0.2 s has passed after the power is supplied to the motor 2, the electromagnetic component 140 is controlled to cut off the power. At this time, the second friction member 142 is separated from the first friction member 141 due to the action of the elastic element 143; the elastic assembly 13 attempts to push the roller 15 back to the middle position of the working surface 100. However, at this time, the frictional resistance received by the roller 15 is much greater than the elastic force of the elastic assembly 13. Therefore, the driving disk 10, the roller 15, and the outer ring 11 will always be in contact, and the rotational movement of the motor 2 will drive the rotation of the outer ring 11.

[0086] The above driving device can be applied to the taxiing tires of an aircraft. That is, the inner ring 16 is arranged in the main shaft of the tire, and the tire is mounted on the outer ring 11; when the aircraft is on the ground, the jet engine does not need to be started, and the power supply can be directly used for energy supply. The driving device of the present application directly drives the tire to realize actions such as the forward movement, backward movement, and turning of the aircraft.

[0087] When the aircraft just touches the ground during landing, the tire will be driven to rotate under the action of the ground friction force. At this time, the overrunning clutch 1 is in the overrunning state, and the rotational movement of the outer ring 11 is idling, which will not affect the structures such as the motor 2 and the speed reducer 3 inside the driving device.

[0088] As is well known to those skilled in the art, in the above overrunning clutch 1, motor 2, and speed reducer 3, a certain number of bearings need to be provided for each rotary moving part to achieve smooth rotation and reduce wear. To make the technical key points of the present invention clearer and more distinct, the installation positions and forms of the bearings are not described herein. After reading the solution of the present application, those skilled in the art can set and flexibly adjust them as needed.

[0089] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Overrunning clutch, characterized in that: include: The active disk has a plurality of working surfaces arranged in a circumferential array on its outer wall, and a group of rollers is placed on each group of the working surfaces; A retainer is sleeved on the active disk, and the retainer is provided with a receiving position for placing each group of the rollers; the position of the rollers on the working surface can be changed by the offset rotation of the active disk and the retainer; An outer ring is coaxially arranged on the outer peripheral side of the active disk; the roller contacts the outer ring when it is at the side of the working surface, and is separated from the outer ring when it is in the middle of the working surface; an elastic component, connected between the active disk and the retaining frame, driving the roller to remain in the middle of the working surface; and The driving assembly acts on the retaining frame and can block the retaining frame when the active disk rotates, so that the active disk and the retaining frame are misaligned.

2. The overrunning clutch according to claim 1, characterized in that: A plurality of protrusions are provided on the outer wall of the active disk; the elastic component comprises springs provided on both sides of each group of the protrusions; The spring abuts between the protrusion and the retaining frame to drive the retaining frame to push the roller to be retained in the middle of the working surface.

3. The overrunning clutch according to claim 1 or 2, characterized in that: The drive assembly comprises: a first friction member; a second friction member connected to the retaining frame via an elastic element, so as to drive the second friction member to separate from the first friction member; and The electromagnetic component is arranged on the same side of the first friction member and is used for adsorbing the second friction member so that the second friction member contacts the first friction member.

4. The overrunning clutch according to claim 3, characterized in that: It also includes an inner ring coaxially arranged inside the outer ring, the active disk is rotatably sleeved on the inner ring; the electromagnetic assembly and the first friction member are both arranged on the inner ring.

5. A driving device, characterized in that: It comprises a motor, a reducer and the overrunning clutch as claimed in claim 4, wherein the motor is connected to the input end of the reducer, and the active disk is connected to the output end of the reducer.

6. The driving device according to claim 5, characterized in that: The motor comprises a rotor and a stator; The rotor is rotatably sleeved on the inner ring, the stator is arranged on the outer circumference of the rotor, and the stator is fixed on the inner ring; the input end of the reducer is connected to the rotor.

7. The driving device according to claim 6, characterized in that: The reducer is a small-tooth-difference reducer, a cycloidal wheel reducer or a harmonic gear reducer.

8. The driving device according to claim 7, characterized in that: The reducer comprises a ring gear and a planetary gear; The inner ring surface of the gear ring is a toothed surface, and the gear ring is fixed on the stator; The rotor is provided with an eccentric outer circle, the planetary gear is sleeved on the eccentric outer circle, and the planetary gear is meshed with the gear ring to form a pair of small tooth difference gear pairs; Among the planetary gear and the driving disk, any one of them is provided with a plurality of pins around its own axis, and the other is provided with through holes corresponding to the plurality of pins one by one around its own axial direction, so that the planetary gear and the driving disk form a parallelogram output mechanism through the pins.

9. The driving device according to claim 6, characterized in that: The inner ring has a first end and a second end opposite to each other in the axial direction; a first sealing portion is provided on the outer side wall of the first end of the inner ring, and a second sealing portion is provided on the stator to seal and connect to the second end of the inner ring; the outer ring is rotatably sleeved on the first sealing portion and the second sealing portion; A chamber is formed between the inner ring and the outer ring, and the two axial ends of the chamber are closed by the first blocking portion and the second blocking portion; the motor, the reducer and the overrunning clutch are all located in the chamber.

10. The driving method of the driving device according to any one of claims 5 to 9, characterized in that: Before the motor drives the outer ring to rotate, the first friction member is first brought into contact with the second friction member through the electromagnetic assembly, so that the roller is moved to the side of the working surface through the retaining frame, so that the inner ring and the outer ring are connected to a combined state through the roller; When the outer ring rotates freely, the electromagnetic assembly does not work, and the inner ring and the outer ring are in a disengaged overrunning state.

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