Electric driving device

Abstract

The utility model provides an electric driving device, and belongs to the technical field of devices for converting rotary motion into reciprocating motion. The electric driving device comprises a shell, a lead screw telescopic assembly, a motor and a control device for controlling the motor to work are arranged in the shell, the output end of the motor is connected with a speed reducer or / and the tail of the motor is provided with a brake, and the output end of the motor or the speed reducer is in transmission connection with a lead screw in the lead screw telescopic assembly through a gear transmission mechanism. The rotating axis of the lead screw extends in the longitudinal direction, the speed reducer or / and the brake and the motor are arranged in the longitudinal direction, the control device, the lead screw and the motor are arranged in parallel, and the control device is located on the transverse side of the lead screw, so that compared with the mode that the control device is arranged on the longitudinal side of the motor, the longitudinal size of the shell can be reduced, and the length of the lead screw is shortened; and the operation stability of the lead screw and the service life of the electric driving device are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a device for controlling mechanical energy which is connected to a motor in structure, in particular to a device for converting rotary motion into reciprocating motion. BACKGROUND

[0002] The electric driving device (i.e. electric push rod) is a kind of electric power driving device for converting the rotary motion of motor into the linear reciprocating motion of push rod, and is widely applied in many fields. The Chinese utility model patent with the authorization announcement number CN213367560U discloses an electric push rod, which comprises a shell, a motor, a screw rod telescopic assembly, a push rod and a controller. The shell has a first chamber and a second chamber side by side and a third chamber located at the longitudinal end of the first chamber and the second chamber. The motor and the controller are in the first chamber. The screw rod telescopic assembly is in the second chamber, which comprises a screw rod and a nut sleeve. The push rod is movably installed on the shell and connected with the nut sleeve. The output end of the motor is in transmission cooperation with one end of the screw rod through a gear transmission structure, and the gear transmission structure is located in the third chamber. In addition, the tail of the motor is provided with a first magnet, and the controller is provided with a magnetic encoder. The magnetic encoder detects the motion state of the motor through the first magnet and feeds back to the controller, so that the controller can judge the telescopic distance and telescopic speed of the push rod.

[0003] The motor, the controller and the encoder of the above-mentioned electric push rod are all arranged in the first chamber, and the motor is generally provided with a driver. In actual application, the driver and the controller can be integrally arranged or separately arranged (the driver and the controller can be regarded as a controller). However, no matter which arrangement mode is adopted, the space in the first chamber needs to be occupied. In addition, in actual application, in order to achieve the effect of speed reduction and torque increase, a speed reducer needs to be connected to the output end of the motor, and a brake needs to be installed at the tail of the motor to realize reliable self-locking when the motor stops working. If these devices such as speed reducer and / or brake are added, the first chamber needs to have a larger longitudinal space, which not only leads to the fact that the longitudinal size of the shell is relatively large, but also affects the stroke of the push rod. The length of the push rod and the screw rod needs to be lengthened. Since the screw rod is only rotatably installed at one end in the shell and the other end is overhanging, the length of the screw rod will affect its stability. The axial force received by the push rod will be transmitted to the screw rod, which will cause the deformation of the screw rod and affect the service life of the electric push rod. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an electric driving device to solve the problems that the longitudinal size of the shell is relatively large and the length of the screw rod is relatively long after adding a speed reducer and / or brake in the prior art, which affects the service life.

[0005] To achieve the above object, the electric driving device adopts the following technical scheme:

[0006] The electric driving device comprises a shell, a screw telescopic assembly, a motor and a control device arranged in the shell, the output end of the motor is connected with a speed reducer, the tail of the motor is provided with a brake, the output end of the motor or the speed reducer is connected with a screw in the screw telescopic assembly through a gear transmission mechanism, the rotation axis of the screw extends in the longitudinal direction, the speed reducer and the brake are arranged in the longitudinal direction of the motor, the control device, the screw and the motor are arranged side by side, and the control device is arranged on the transverse side of the screw.

[0007] The beneficial effects of the above technical scheme are that the utility model belongs to the invention and creation of element relationship change, mainly changes the arrangement position of the control device, the output end of the motor is connected with the speed reducer or the tail of the motor is provided with the brake, the speed reducer and the brake are arranged in the longitudinal direction of the motor, which has increased the occupation of the longitudinal space, on this basis, the utility model arranges the control device, the screw and the motor side by side, and the control device is arranged on the transverse side of the screw, compared with the control device arranged on the longitudinal side of the motor, the longitudinal size of the shell can be reduced, and then the length of the screw is shortened, the stability of the screw operation and the service life of the electric driving device are ensured.

[0008] Further, the shell comprises a cylindrical shell body and first and second end covers which are detachably mounted at two ends of the shell body, a fixed plate is arranged in the shell body, the shell body, the fixed plate and the first end cover enclose a first chamber, the shell body, the fixed plate and the second end cover enclose a second chamber, the gear transmission mechanism is located in the first chamber, the motor, the control device and the screw telescopic assembly are located in the second chamber, and the output end of the motor or the speed reducer and one end of the screw respectively extend into the first chamber through the fixed plate and are matched with the gear transmission mechanism.

[0009] Further, the first and second end covers respectively have annular flanges inserted into the shell body, end face sealing rings are respectively arranged between the end faces of the first and second end covers and the end faces of the shell body, and peripheral surface sealing rings are respectively arranged between the annular flanges of the first and second end covers and the inner walls of the shell body.

[0010] Further, the second end cover is provided with an inner boss extending towards the second chamber, the screw telescopic assembly comprises a nut sleeve connected with the screw, a push rod penetrating the inner boss and the second end cover is connected to the nut sleeve, and a sealing ring and a wear-resistant ring matched with the outer peripheral surface of the push rod are arranged on the perforated hole wall of the inner boss.

[0011] Further, at least one of the sealing ring and the wear-resistant ring is provided with two or more than two, and the sealing ring and the wear-resistant ring are arranged in the axial direction.

[0012] Further, the second end cover is provided with a dustproof ring matched with the outer circumferential surface of the push rod on the perforated hole wall.

[0013] Further, the electric driving device further comprises a detecting device for detecting the humidity in the second chamber.

[0014] Further, the fixing plate is provided with an annular boss extending towards the second chamber, the inner hole of the annular boss comprises a large-diameter hole, a small-diameter hole and a large-diameter hole arranged in sequence along the axial direction, two bearings are respectively installed in the two large-diameter holes, the lead screw comprises a screw rod segment located in the second chamber and a light rod segment passing through the inner rings of the two bearings and being in interference assembly with the inner rings, an axial shoulder or an axial ring is arranged between the screw rod segment and the light rod segment, the axial shoulder or the axial ring abuts against the end surface of the inner ring of one of the bearings, and the part of the lead screw extending into the first chamber is provided with a lock nut abutting against the end surface of the inner ring of the other bearing.

[0015] Further, the lead screw is located at the center of the shell, and the control device and the motor are respectively located on the two radial sides of the lead screw.

[0016] Further, the output end of the motor is connected with a speed reducer, and the tail part of the motor is provided with a brake and an encoder, and the brake and the encoder are connected with the control device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the electric driving device embodiment of the utility model;

[0018] Figure 2 is Figure 1 is a local enlarged view of the connecting part between the first end cover and the shell;

[0019] Figure 3 is a hardware structure schematic view of the driver in the electric driving device embodiment of the utility model;

[0020] Figure 4 is a control principle diagram of the electric driving device embodiment of the utility model.

[0021] In the diagram: 1. Housing; 1-1. Fixing plate; 1-2. Annular boss; 2. First end cover; 2-1. Annular flange; 3. Second end cover; 3-1. Inner boss; 4. Lead screw; 4-1. Screw section; 4-2. Polished section; 4-3. Collar; 5. Nut sleeve; 6. Push rod; 7. Motor; 8. Reducer; 9. Brake; 10. Encoder; 11. Driver; 12. First bearing; 13. Second bearing; 14. Locking nut; 15. Drive gear; 16. Intermediate gear; 17. Driven gear; 18. Intermediate shaft; 19. Gear bearing; 20. Contact plate; 21. First limit switch; 22. Second limit switch; 23. Wear ring; 24. Sealing ring; 25. Dustproof ring; 26. End face sealing ring; 27. Circumferential sealing ring; 100. First chamber; 200. Second chamber. Detailed Implementation

[0022] In view of the technical problems existing in the prior art, the basic concept of this utility model is to change the internal layout of the electric drive device so that the control device is arranged in parallel with the motor and the lead screw, and the control device is located on the lateral side of the lead screw, thereby reducing the vertical space occupied by the control device, controlling the vertical dimension of the housing, and avoiding the lead screw being too long and affecting stability.

[0023] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0024] Example 1 of the electric drive device in this utility model:

[0025] like Figure 1 As shown, the electric drive device includes a housing, which comprises a cylindrical housing 1 and a first end cover 2 and a second end cover 3 detachably mounted at both ends of the housing 1. Specifically, the detachable mounting method is a screw connection, where screws pass through the end covers and connect to threaded holes on the end faces of the housing 1. Simultaneously, combined with... Figure 2 As shown, the first end cap 2 and the second end cap 3 each have an annular flange 2-1 inserted into the housing 1. An end face sealing ring 26 is provided between the end face of the first end cap 2 and the end face of the housing 1, and a peripheral sealing ring 27 is provided between the annular flange 2-1 of the first end cap 2 and the inner wall of the housing 1. The use of double sealing rings can ensure the sealing of both ends of the housing. The end face sealing ring 26 can isolate liquid water, and the peripheral sealing ring 27 can isolate water vapor, effectively achieving the long-term watertight performance of the electric drive device.

[0026] like Figure 1As shown, the housing 1 is provided with a fixed plate 1-1, which can be integrally connected with the housing 1 or fixed by separate welding, so as to ensure that the fixed plate 1-1 can separate the inner cavity of the housing 1 into two chambers, wherein the housing 1, the fixed plate 1-1 and the first end cover 2 form a first chamber 100, and the housing 1, the fixed plate 1-1 and the second end cover 3 form a second chamber 200. The first chamber 100 is provided with a gear transmission mechanism, which includes a driving gear 15, an intermediate gear 16 and a driven gear 17 which are sequentially engaged.

[0027] The second chamber 200 is provided with a screw telescopic assembly, a motor 7, a speed reducer 8, a brake 9, an encoder 10 and a driver 11, wherein the motor 7 is a direct-current brushless motor, the speed reducer 8 is connected to the output end of the motor 7 and is used to realize speed reduction and torque increase. The speed reducer 8 is fixed on the fixed plate 1-1, and the output end of the speed reducer 8 is in transmission connection with the lead screw 4 in the screw telescopic assembly through the gear transmission mechanism, specifically, the output end of the speed reducer 8 extends into the first chamber 100 through the fixed plate 1-1, and the driving gear 15 is installed on the output end of the speed reducer 8. The brake 9 and the encoder 10 are arranged at the tail of the motor 7, and the speed reducer 8, the motor 7, the brake 9 and the encoder 10 are sequentially arranged along the longitudinal direction, wherein the brake 9 is used to realize reliable self-locking when the motor stops working, and the encoder 10 is used to monitor the running angle of the motor.

[0028] The rotation axis of the lead screw 4 extends along the longitudinal direction, and the screw telescopic assembly further includes a nut sleeve 5 which is connected with the lead screw 4 in cooperation, the second end cover 3 is provided with an inner boss 3-1 which extends into the second chamber 200, the nut sleeve 5 is connected with a push rod 6 which penetrates the inner boss 3-1 and the second end cover 3, the perforated hole wall of the inner boss 3-1 is provided with a sealing ring 24 and a wear-resistant ring 23 which cooperate with the outer peripheral surface of the push rod 6, and the sealing ring 24 and the wear-resistant ring 23 are respectively provided with two rows, and the sealing ring 24 and the wear-resistant ring 23 are arranged in axial staggered manner. At the same time, the perforated hole wall of the second end cover 3 is provided with a dustproof ring 25 which cooperates with the outer peripheral surface of the push rod 6, and a combined sealing structure is adopted to ensure that the push rod 6 can reciprocate while maintaining good water-tightness, so as to prevent the internal components from being dampened and invalid.

[0029] The fixed plate 1-1 is provided with an annular boss 1-2 which extends into the second chamber 200, the inner hole of the annular boss 1-2 includes large-diameter holes and small-diameter holes which are sequentially arranged along the axial direction, two bearings are respectively installed in the two large-diameter holes, and the two bearings are respectively a first bearing 12 and a second bearing 13, and the outer rings of the two bearings are in interference fit with the hole walls of the large-diameter holes.

[0030] The screw rod 4 comprises a screw rod segment 4-1 located in the second cavity 200 and a light rod segment 4-2 passing through the inner rings of the two bearings and being assembled with the inner rings in an interference fit, and a shaft ring 4-3 is arranged between the screw rod segment 4-1 and the light rod segment 4-2, and the shaft ring 4-3 abuts against the end face of the inner ring of the second bearing 13. The part of the screw rod 4 extending into the first cavity 100 is provided with a lock nut 14 abutting against the end face of the inner ring of the first bearing 12, so that the screw rod 4 is stably mounted on the two bearings, the ability of the screw rod 4 to bear axial load is improved, and in turn the operation stability can be improved. Since the lock nut 14 is connected to the screw rod 4, the part of the screw rod 4 extending into the first cavity 100 comprises a threaded segment and a light shaft segment, the outer diameter of the threaded segment is smaller than the outer diameter of the light rod segment 4-2, and the outer diameter of the light shaft segment is smaller than the outer diameter of the threaded segment, so that the light rod segment 4-2 can pass through the inner rings of the two bearings, and the lock nut 14 can be mounted on the threaded segment.

[0031] The driven gear 17 is mounted on the light shaft segment of the screw rod 4, the intermediate shaft 18 is rotatably mounted in the first cavity 100 through a gear bearing 19, and the intermediate gear 16 is mounted on the intermediate shaft 18. When the motor 7 works, the reducer 8 drives the driving gear 15 to rotate, the driving gear 15 drives the driven gear 17 to rotate through the intermediate gear 16, and the screw rod 4 rotates synchronously with the driven gear 17, so that the nut sleeve 5 moves linearly along the screw rod segment 4-1 of the screw rod 4. At the same time, the nut sleeve 5 is provided with a touch plate 20, the first limit switch 21 and the second limit switch 22 are fixedly arranged in the second cavity 200, and when the nut sleeve 5 moves to the limit position, the touch plate 20 can trigger the two limit switches to realize automatic power-off of the motor.

[0032] The motor 7, the brake 9, the encoder 10, the first limit switch 21 and the second limit switch 22 are connected with the driver 11, the driver 11 is fixed on the fixed plate 1-1, and the driver 11 is used as a control device for controlling the motor 7 to work, the driver 11 and the controller are designed in an integrated manner to realize functions such as receiving host computer instructions for self-checking, regulating and controlling the electric driving device, and feeding back demand information. The driver 11, the screw rod 4 and the motor 7 are arranged side by side, and the driver 11 is located on the transverse side of the screw rod 4. Specifically, the screw rod 4 is located at the center of the shell 1, the driver 11 and the motor 7 are respectively located on the radial two sides of the screw rod 4, the push rod 6 is arranged at the center of the second end cover 3, and the space in the shell 1 is fully utilized. Compared with the prior art in which the control device is arranged on the longitudinal side of the motor, the longitudinal size of the shell can be reduced, the length of the screw rod can be shortened, the stability of the screw rod in operation and the service life of the electric driving device can be ensured.

[0033] In addition, a micro temperature and humidity sensor is arranged on the circuit board of the driver 11, which serves as a detection device for detecting the temperature and humidity in the second chamber, and can monitor the temperature and humidity of the internal environment of the electric drive device.

[0034] As shown in Figure 3 The hardware structure of the driver 11 includes a microprocessor, a power supply circuit, a direct-current brushless motor drive inverter circuit (referred to as an inverter circuit), a current sampling circuit, an overcurrent protection circuit, a Hall switch circuit, an encoder interface circuit, a CAN bus driving circuit, a power-off brake interface circuit, a limit switch interface circuit, a temperature and humidity acquisition circuit, etc., and can realize self-checking function, state information monitoring function, overvoltage and overcurrent self-protection function, etc.

[0035] The working mechanism of the electric drive device is as follows:

[0036] As shown in Figure 1 and Figure 4 After the electric drive device is assembled, the driver 11 performs self-checking according to the instructions of the upper computer, judges whether the electric drive device is working normally by reading the feedback signals of the motor Hall element, the encoder 10 and the power supply voltage, and judges whether the internal environment of the shell 1 can continue to work by reading the feedback values of the micro temperature and humidity sensor through the temperature and humidity acquisition circuit. When working, after the driver 11 receives the adjustment command through the CAN bus, the absolute position value of the encoder 10 is read and compared with the target position, the rotation direction and rotation angle of the motor 7 are determined according to the comparison result, and the best rotating speed of the motor 7 is determined according to the moving distance. Then, the driver 11 applies power to the brake 9, the brake function of the brake 9 is closed, and the driver 11 starts the motor 7, the motor 7 starts to rotate and accelerate, the software reads the state of the Hall switch, calculates the speed and acceleration of the motor 7 according to the change of the Hall switch, and forms a speed closed-loop control mode by the driver 11 and the motor 7. Under the adjustment of the speed control loop, the rotating speed of the motor 7 reaches the set rotating speed and continues to rotate. The motor 7 controls the movement of the push rod 6 through the speed reducer 8, the gear transmission mechanism and the screw extension assembly, the encoder 10 calculates the displacement of the push rod 6 in real time and feeds back to the driver 11, the driver 11 judges the distance from the target position according to the feedback value of the encoder 10. When approaching the target position, the driver 11 controls the motor 7 to slow down, the motor 7 continues to run at a relatively low speed, and when reaching the target position, the motor 7 is turned off, the power supply of the brake 9 is turned off, the motor 7 is locked, and the adjustment process is completed.

[0037] In summary, the electric drive device of this utility model has self-diagnosis, rapid repair and long-term watertight functions, and is particularly suitable for use in underwater equipment. After a certain number of years of use, the sealing ring can be replaced while other components can continue to be used, providing a rapid guarantee function.

[0038] In other embodiments of the electric drive device: if necessary, an encoder may not be required, or other devices may be used to replace the function of the encoder, such as position sensors, speed sensors, etc.

[0039] In other embodiments of the electric drive device: if necessary, a brake may not be provided, and only a reducer is added at the motor output end; of course, in other embodiments, a reducer may not be provided, and only a brake is added at the tail end of the motor.

[0040] In other embodiments of the electric drive device: the driver and controller may not be an integrated design, but rather separate designs, although both are located on the lateral side of the lead screw.

[0041] In other embodiments of the electric drive device: when the driver and controller are integrated into a single design, the controller, motor and lead screw can be arranged in a triangular configuration.

[0042] In other embodiments of the electric drive device, the collar between the lead screw section and the guide rod section can also be replaced with a shoulder, with the same function.

[0043] In other embodiments of the electric drive device: the part of the lead screw that extends into the first chamber may not need to be fitted with a locking nut. In this case, the lead screw only includes a screw section and a polished section. The polished section passes through two bearings and is interference-fitted with the inner ring of the bearings. At the same time, the driven gear is also mounted on the polished section. Of course, a shoulder or collar can still be provided between the screw section and the polished section to stop with the inner ring of the bearings. In this case, it is not necessary to provide two bearings; only one bearing is required. In this case, the inner hole of the annular boss is a hole of equal diameter.

[0044] In other embodiments of the electric drive device: the temperature and humidity sensor can replace the humidity sensor that only detects humidity; of course, in other embodiments, the detection device may not be provided.

[0045] In other embodiments of the electric drive device: the dustproof ring may no longer be provided on the perforation wall of the second end cover, and the seal can be achieved solely by the sealing ring and wear-resistant ring on the perforation wall of the inner boss.

[0046] In other embodiments of the electric drive device: two sealing rings and one wear-resistant ring, or one sealing ring and two wear-resistant rings, with the sealing rings and wear-resistant rings still arranged alternately along the axial direction. Of course, in other embodiments, one sealing ring and one wear-resistant ring can also be provided.

[0047] In other embodiments of the electric drive device: the inner boss may not be provided on the second end cover. In this case, both the sealing ring and the wear-resistant ring are provided on the wall of the through hole of the second end cover. The plate thickness of the second end cover is required to be sufficient. Of course, only the sealing ring can be provided, and the wear-resistant ring is not provided, so as to ensure the basic sealing function.

[0048] In other embodiments of the electric drive device: the first end cover and the second end cover may not include the annular flange inserted into the housing, in which case end face sealing rings are provided only between the end faces of the first end cover and the second end cover and the end face of the housing.

[0049] In other embodiments of the electric drive device: when no reducer is provided, the output end of the motor extends through the fixed plate into the first chamber and is equipped with a drive gear.

[0050] In other embodiments of the electric drive device: the gear transmission mechanism includes only a driving gear and a driven gear that mesh with each other, and no intermediate gear is provided.

[0051] In other embodiments of the electric drive device: the fixing plate may no longer be provided inside the housing, and there is only one chamber inside the housing. In this case, some brackets can be fixed separately inside the housing to realize the installation of the motor, reducer, driver and lead screw.

[0052] In other embodiments of the electric drive device: when there is no fixed plate inside the housing and there is only one chamber, a sealing plate can be integrally provided at one end of the housing, and only an end cap needs to be installed at the other end of the housing.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An electric drive device, characterized by comprising: The housing comprises a housing, a screw telescopic assembly, a motor and a control device for controlling the motor, the output end of the motor is connected with a speed reducer, or / and the tail of the motor is provided with a brake, the output end of the motor or the speed reducer is connected with the screw of the screw telescopic assembly through a gear transmission mechanism, the rotation axis of the screw extends along the longitudinal direction, the speed reducer and / or the brake are arranged along the longitudinal direction of the motor, the control device, the screw and the motor are arranged side by side, and the control device is located on the transverse side of the screw.

2. The electric drive device according to claim 1, characterized by The housing comprises a cylindrical shell and first and second end covers which are detachably mounted at both ends of the shell, a fixed plate is arranged in the shell, the shell, the fixed plate and the first end cover form a first chamber, the shell, the fixed plate and the second end cover form a second chamber, the gear transmission mechanism is located in the first chamber, the motor, the control device and the screw telescopic assembly are located in the second chamber, and the output end of the motor or the speed reducer and one end of the screw respectively extend into the first chamber through the fixed plate and are matched with the gear transmission mechanism.

3. The electric drive device according to claim 2, characterized by The first and second end covers respectively have annular flanges which are inserted into the shell, end face sealing rings are respectively arranged between the end faces of the first and second end covers and the end faces of the shell, and peripheral surface sealing rings are respectively arranged between the annular flanges of the first and second end covers and the inner walls of the shell.

4. An electric drive arrangement according to claim 2 or 3, characterized in that The second end cover is provided with an inner boss which extends into the second chamber, the screw telescopic assembly comprises a nut sleeve which is matched with the screw, a push rod which penetrates the inner boss and the second end cover is connected to the nut sleeve, and a sealing ring and a wear-resistant ring which are matched with the outer peripheral surface of the push rod are arranged on the hole wall of the through hole of the inner boss.

5. The electric drive device according to claim 4, characterized by At least one of the sealing ring and the wear-resistant ring is provided with two or more than two, and the sealing ring and the wear-resistant ring are arranged in an axial staggered manner.

6. The electric drive device according to claim 4, characterized by A dustproof ring which is matched with the outer peripheral surface of the push rod is arranged on the hole wall of the through hole of the second end cover.

7. An electric drive arrangement according to claim 2 or 3, characterised in that The electric driving device further comprises a detection device for detecting the humidity in the second chamber.

8. An electric drive arrangement according to claim 2 or 3, characterized in that The fixed plate is provided with an annular boss which extends into the second chamber, the inner hole of the annular boss comprises a large-diameter hole, a small-diameter hole and a large-diameter hole which are arranged in sequence along the axial direction, two bearings are respectively arranged in the two large-diameter holes, the screw comprises a screw rod segment located in the second chamber and a light rod segment which penetrates the inner rings of the two bearings and is in interference assembly with the inner rings, an axial shoulder or an axial ring is arranged between the screw rod segment and the light rod segment, the axial shoulder or the axial ring abuts against the end face of the inner ring of one of the bearings, and the part of the screw which extends into the first chamber is provided with a lock nut which abuts against the end face of the inner ring of the other bearing.

9. An electric drive arrangement according to claim 2 or 3, characterised in that, The screw is located at the center of the shell, and the control device and the motor are respectively located on the two radial sides of the screw.

10. The electric drive device according to any one of claims 1 to 3, characterized by The output end of the motor is connected with a speed reducer, and the tail of the motor is provided with a brake and an encoder, and the brake and the encoder are connected with the control device.

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