Electrically driven oscillating cylinder

Abstract

The utility model relates to the technical field of oscillating cylinders, in particular to an electric drive oscillating cylinder which comprises a shell, and meshing teeth are arranged on the inner side wall of the shell; the output screw is coaxially and rotationally connected to one end of the shell; the electric driving mechanism comprises a driving shaft, and the electric driving mechanism is used for driving the output screw to rotate; and the transmission mechanism is arranged between the driving shaft and the output screw rod, the transmission mechanism comprises a plurality of driving gears and a plurality of transmission gears, the transmission gears are meshed between the inner side wall of the shell and the driving gears, and the transmission gears and the driving gears are matched with each other to be used for achieving speed reduction transmission between the output screw rod and the driving shaft. The driving shaft and the output screw are designed in a split mode, and the transmission mechanism is arranged between the driving shaft and the output screw, so that the number of outer teeth of the middle sun gear is reduced, the reduction ratio of the transmission mechanism can be increased, and under the condition that the motor performance is the same, the torque output by the swing cylinder is increased.

Description

Technical Field

[0001] The present application relates to the technical field of swing cylinders, and in particular to an electrically driven swing cylinder. Background Art

[0002] With the acceleration of the electrification process in the construction machinery industry, aerial work vehicles, as a common type of construction machinery, currently use conventional swing cylinders, which are driven hydraulically, for the left and right swinging of their working baskets.

[0003] The hydraulically driven swing cylinder has the problems of unstable oil pressure and slow response speed in practical application. Therefore, a solution of replacing the hydraulic drive with electric drive is proposed to drive the swing cylinder.

[0004] The existing electric-driven swing cylinder combines a motor structure and a gear reduction transmission structure to control the rotation of the output shaft. The output shaft passes through the reduction transmission structure and is connected to the motor structure. A central through hole passing through the output shaft is opened on the output shaft to connect the working basket. However, since this structure requires a through hole to be opened on the output shaft, the outer diameter of the output shaft is large, and the diameter of the gear connected to the output shaft is also large, which results in a smaller reduction ratio of the gear reduction transmission structure. When the motor performance is the same, the torque output by the swing cylinder is reduced. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the output torque of the existing electric swing cylinder is relatively small.

[0006] To this end, the utility model provides an electrically driven swing cylinder.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] An electrically driven swing cylinder, comprising:

[0009] A shell, wherein the inner wall of the shell is provided with teeth;

[0010] An output screw rod, the output screw rod being coaxially rotatably connected to one end of the housing;

[0011] An electric drive mechanism, the electric drive mechanism comprising a drive shaft, and the electric drive mechanism is used to drive the output screw to rotate;

[0012] A transmission mechanism is arranged between the drive shaft and the output screw, and the transmission mechanism includes multiple driving gears and multiple transmission gears. The transmission gears are meshed between the inner wall of the shell and the drive gears, and the transmission gears and the drive gears cooperate with each other to realize the reduction transmission between the output screw and the drive shaft.

[0013] By adopting the above technical solution, the drive shaft and the output screw are separately arranged, so that the output screw does not need to pass through the transmission mechanism, and the output screw is driven to rotate by the step-by-step transmission of the drive shaft and the drive gear. Therefore, except for the drive gear directly connected to the output screw, the output screw does not need to pass through other drive gears, so that the diameters of other drive gears except the drive gear directly connected to the output screw can be reduced, and the number of external teeth of the middle drive gear is reduced, thereby increasing the reduction ratio of the transmission mechanism. Under the condition of the same motor performance, the torque output by the swing cylinder will increase.

[0014] Furthermore, the transmission mechanism includes multiple transmission groups, and one or more transmission gears and a driving gear form a transmission group; along the direction from the driving shaft to the output screw, the multiple transmission groups are sequentially recorded as the first transmission group, the n-1th transmission group, and the nth transmission group, and a fixing pin is arranged between the transmission gear and the driving gear in the same transmission group.

[0015] Furthermore, in the same transmission group, the transmission gear is located on the side of the driving gear close to the electric drive mechanism; the transmission gear in the first transmission group is meshed between the driving shaft and the inner wall of the shell, the driving gear in the nth transmission group is connected to the output screw, and the transmission gear in the nth transmission group is meshed between the driving gear in the n-1th transmission group and the inner wall of the shell.

[0016] Furthermore, a connecting column is coaxially connected to a side of the driving gear away from the electric drive mechanism, and the connecting column is provided with teeth for meshing with the transmission gear.

[0017] Furthermore, a fixing hole and a plurality of auxiliary holes are arranged on the end surface of the output screw away from the interior of the shell, the fixing hole is arranged coaxially with the output screw, and the plurality of auxiliary holes are axially arranged around the fixing hole.

[0018] Furthermore, a partition is provided in the shell, a through opening is provided on the partition, the partition divides the interior of the shell into a driving chamber and a transmission chamber, the electric drive mechanism is provided in the driving chamber, the transmission mechanism is provided in the transmission chamber, and the drive shaft passes through the partition.

[0019] Furthermore, the electric drive mechanism also includes a stator assembly and a rotor assembly, wherein the rotor assembly is coaxially fixedly connected to the drive shaft, the stator assembly is fixedly connected in the housing, and the stator assembly is sleeved outside the rotor assembly.

[0020] Furthermore, the electric drive mechanism also includes a brake, which is arranged in the driving cavity, located on a side of the rotor assembly away from the partition, and connected to the driving shaft.

[0021] Furthermore, a first limiting ring is connected to the open end close to the driving cavity, and a second limiting ring is connected to the open end of the shell close to the transmission cavity.

[0022] Furthermore, installation steps are provided on the inner side walls at both ends of the shell, and the first limiting ring and the second limiting ring are both clamped on the installation steps.

[0023] Furthermore, a mounting groove is provided on the end surface of the first limiting ring away from the driving cavity, the mounting groove is arranged in a ring shape, a thread is provided on the side wall of the mounting groove close to the axis of the first limiting ring, an end cover is provided in the mounting groove, the end cover is arranged in a ring shape, a locking nut is threadedly connected on the middle part of the first limiting ring, and the locking nut abuts against the end cover on one side close to the inside of the shell to lock the end cover in the mounting groove.

[0024] Furthermore, a brake is provided in the driving cavity, and the brake is connected to the driving shaft.

[0025] The beneficial effect of the utility model is that the drive shaft and the output screw are separately arranged, so that the output screw does not need to pass through the transmission mechanism. Except for the driving gear connected to the output screw, the output screw does not need to pass through other driving gears, so that the diameter of other driving gears except the driving gear connected to the output screw can be reduced, and the number of external teeth of the intermediate driving gear is reduced, thereby increasing the reduction ratio of the transmission mechanism. Under the condition of the same motor performance, the torque output by the swing cylinder will increase.

[0026] By arranging a fixing hole and an auxiliary hole on the end face of the output screw rod to connect the working basket, the working basket is connected to the output shaft by bolts, which improves the stability of the installation, improves the safety of the swing cylinder when in use, and realizes secondary protection of the working basket connection.

[0027] The electric drive mechanism is used in conjunction with the brake to achieve rapid response of the swing cylinder to the swing and stop actions. In a sudden emergency, the brake can be used to perform emergency braking on the swing cylinder to achieve a self-locking function at any position. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a schematic diagram of the overall structure of the electrically driven swing cylinder in the utility model.

[0030] Figure 2 It is a structural schematic diagram of the transmission mechanism in the utility model.

[0031] In the figure: 1. shell; 10. partition; 11. opening; 12. drive cavity; 13. transmission cavity; 14. first limiting ring; 15. second limiting ring; 16. end cover; 17. mounting groove; 18. mounting step; 19. locking nut; 2. output screw; 20. fixing hole; 21. auxiliary hole; 3. electric drive mechanism; 30. stator assembly; 31. rotor assembly; 32. drive shaft; 33. brake; 4. transmission mechanism; 40. first drive gear; 41. first transmission gear; 42. second drive gear; 43. second transmission gear; 44. third drive gear; 45. third transmission gear; 46. fixing pin; 47. connecting column; 5. lifting ear. DETAILED DESCRIPTION

[0032] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0033] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference Figure 1 and Figure 2 An electrically driven swing cylinder comprises a housing 1, an output screw 2, an electric drive mechanism 3 and a transmission mechanism 4. The housing 1 is connected to a lifting lug 5 for mounting the electrically driven swing cylinder via a rib plate.

[0036] Both ends of the shell 1 are set to be openings, a partition 10 is set in the shell 1, and a through hole 11 is set on the partition 10. The partition 10 divides the interior of the shell 1 into a driving chamber 12 and a transmission chamber 13. The electric drive mechanism 3 is set in the driving chamber 12, the transmission mechanism 4 is set in the transmission chamber 13, the output screw 2 is connected to the transmission mechanism 4, and teeth are set on the inner wall of the shell 1, and the teeth are set on the inner wall of the transmission chamber 13.

[0037] The output screw 2 is coaxially connected to one end of the shell, the electric drive mechanism includes a drive shaft 32, the drive shaft 32 is coaxially connected to the shell 1, the transmission mechanism 4 is arranged between the drive shaft 32 and the output screw 2, the transmission mechanism 4 includes multiple drive gears and multiple transmission gears, the multiple drive gears are coaxially arranged in the shell, the drive shaft 32 is meshed with the transmission gear arranged near the drive shaft 32, the output screw 2 is coaxially connected to the drive gear arranged near the output screw 2, among which, the output sun gear is connected to the output screw 2, and the rest are intermediate sun gears, and the transmission gears and the drive gears cooperate with each other to realize the reduction transmission between the output screw and the drive shaft.

[0038] The drive shaft 32 and the output screw 2 are separately arranged, so that the output screw 2 does not need to pass through the transmission mechanism 4, and the output screw 2 is driven to rotate by the step-by-step transmission of the drive shaft 32 and the drive gear. Therefore, except for the drive gear directly connected to the output screw 2, the output screw 2 does not need to pass through other drive gears, so that the diameters of other drive gears except the drive gear directly connected to the output screw 2 can be reduced, and the number of external teeth of the intermediate sun gear can be reduced, thereby increasing the reduction ratio of the transmission mechanism. Under the condition of the same motor performance, the torque output by the swing cylinder will increase.

[0039] Specifically, the electric drive mechanism 3 also includes a stator assembly 30 and a rotor assembly 31. The stator assembly 30, the rotor assembly 31 and the drive shaft 32 together form a frameless motor. The drive shaft 32 passes through the through opening 11 and is rotatably connected to the partition 10 through a bearing. The rotor assembly 31 is coaxially fixedly connected to the drive shaft 32. The rotor assembly 31 and the drive shaft 32 can be fixed by an adhesive. The stator assembly 30 is fixed in the housing 1 by an adhesive. The stator assembly 30 is located in the driving cavity 12 near the partition 10, and the stator assembly 30 is sleeved outside the rotor assembly 31. The housing 1 is also connected to a brake 33, which is arranged in the driving cavity 12. The brake 33 is located on the side of the rotor assembly 31 away from the partition 10. The brake 33 is connected to the drive shaft 32. The driver can be an electromagnetic clutch or other brake 33 that can achieve braking.

[0040] The inner side walls at both ends of the housing 1 are provided with mounting steps 18, and the housing 1 is fixedly connected with a first limiting ring 14, which is covered on the open end of the housing 1 close to the drive chamber 12, and the edge of the first limiting ring 14 is clamped on the mounting step 18, and the drive shaft 32 is rotatably connected with the first limiting ring 14 through a bearing. A mounting groove 17 is provided on the end surface of the first limiting ring 14 away from the drive chamber 12, and the mounting groove 17 is arranged in an annular shape, and a thread is arranged on the side wall of the mounting groove 17 close to the axis of the first limiting ring 14, so that a threaded column coaxially arranged with the first limiting ring 14 is formed on the side of the first limiting ring 14 away from the drive chamber 12, and an end cover 16 is arranged in an annular shape, and a limiting step is arranged on the inner circle of the end cover 16, and a locking nut 19 is threadedly connected to the threaded column, and the locking nut 19 is abutted against the limiting step on the side of the locking nut 19 close to the inside of the housing 1 to lock the end cover 16 in the mounting groove 17.

[0041] The transmission mechanism 4 is arranged in the transmission cavity 13. The transmission mechanism 4 includes multiple transmission groups. The multiple transmission groups are arranged along the axial direction of the shell 1. Each transmission group includes one or more transmission gears, a driving gear and a fixing pin 46 adapted to the transmission gear. The number of the fixing pins 46 is consistent with the number of the transmission gears. Along the direction from the driving shaft 32 to the output screw 2, the multiple transmission groups are sequentially recorded as the first transmission group, the n-1th transmission group, and the nth transmission group. The driving gear is located on the side of the transmission gear away from the electric drive mechanism 3. The fixing pin 46 is coaxially connected to the transmission gear for rotation. The side of the driving gear away from the electric drive mechanism 3 is coaxially connected with a connecting column 47, and the connecting column 47 is provided with meshing teeth. In the same transmission group, the transmission gear is located on the side of the driving gear close to the electric drive mechanism 3; the transmission gear in the first transmission group is meshed between the driving shaft 32 and the inner side wall of the shell 1, the driving gear in the nth transmission group is connected to the output screw 2, and the transmission gear in the nth transmission group is meshed between the connecting column 47 on the driving gear in the n-1th transmission group and the inner side wall of the shell 1.

[0042] Specifically, taking the present embodiment as an example, in the present embodiment, three transmission groups are arranged, that is, n is 3. From the driving chamber 12 toward the transmission chamber 13, the three transmission groups are respectively the first transmission group, the second transmission group and the third transmission group. The first transmission group includes a first transmission gear 41 and a first driving gear 40. The second transmission group includes a second transmission gear 43 and a second driving gear 42. The third transmission group includes a third transmission gear 45 and a third driving gear 44.

[0043] The drive shaft 32 extends through the through opening 11 to the outer circle of one end of the transmission cavity 13, and meshing teeth are arranged. The first transmission gear 41 is located between the drive shaft 32 and the housing 1, and the first transmission gear 41 is meshed with the meshing teeth on the drive shaft 32 and the meshing teeth on the inner wall of the transmission cavity 13. The first drive gear 40 is located on the side of the first transmission gear 41 away from the electric drive mechanism 3; the second transmission gear 43 is located between the housing 1 and the connecting column 47 on the first drive gear 40, and the second transmission gear 43 is meshed with the meshing teeth on the connecting column 47 on the first drive gear 40 and the meshing teeth on the inner wall of the transmission cavity 13, and the second drive gear 42 is located on the side of the second transmission gear 43 away from the electric drive mechanism 3; the third transmission gear 45 is located between the housing 1 and the second drive gear 40. The third transmission gear 45 is meshed with the teeth on the connecting column 47 on the second driving gear 42 and the teeth on the inner wall of the transmission cavity 13. The third driving gear 44 is located on the side of the third transmission gear 45 away from the electric drive mechanism 3. The third driving gear 44 is the output sun gear. The output sun gear and the connecting column 47 on the output sun gear are coaxially provided with connecting holes. The connecting hole on the output sun gear and the connecting hole on the connecting column 47 on the output sun gear are coaxially arranged and interconnected. One end of the output screw 2 is inserted into the connecting hole and fixedly connected to the output sun gear. In order to prevent the output screw 2 from axially jumping, the output sun gear and the output screw 2 gear connection are connected using a shaft retaining ring.

[0044] The driving shaft 32 rotates, and the driving shaft 32 drives the first transmission gear 41 to rotate. The first transmission gear 41 rotates around the fixed pin 46 between the first transmission gear 41 and the first drive gear 40, and drives the first drive gear 40 to rotate around the axis of the shell 1 in the shell 1 through the fixed shaft. The first drive gear 40 drives the second transmission gear 43 to rotate, the second transmission gear 43 rotates around the fixed pin 46 thereon and drives the second drive gear 42 to rotate through the fixed pin 46. The second drive gear 42 drives the third transmission gear 45 to rotate, the third transmission gear 45 rotates around the fixed pin 46 thereon and drives the third drive gear 44 to rotate through the fixed pin 46, thereby driving the output screw 2 to rotate. The first drive gear 40 and the second drive gear 42 are intermediate sun gears, and the third drive gear 44 is connected to the output screw 2 as the output sun gear. The output screw 2 is only connected to the output sun gear. Compared with the prior art, the output shaft structure running through the entire transmission mechanism 4 is eliminated, and the intermediate through hole is eliminated, so that the diameter of the first drive gear 40 and the second drive gear 42 can be reduced compared with the output sun gear, and the number of external teeth of the first drive gear 40 and the second drive gear 42 is reduced, thereby increasing the speed ratio of the planetary reducer. Under the condition of the same motor performance, the torque output by the swing cylinder will increase.

[0045] A second limiting ring 15 is fixedly connected to the shell 1, and the second limiting ring 15 cover is arranged on the open end of the shell 1 close to the transmission chamber 13. The edge portion of the second limiting ring 15 is clamped on the mounting step 18. The connecting column 47 on the output sun gear extends into the inner ring of the second limiting ring 15, and is rotationally connected to the second limiting ring 15 through a bearing. The output screw 2 is rotationally connected to the second limiting ring 15 and the shell 1.

[0046] A fixing hole 20 and a plurality of auxiliary holes 21 are provided on the end surface of the output screw 2 away from the transmission mechanism 4. The fixing hole 20 is coaxially arranged with the output screw 2, and the plurality of auxiliary holes 21 are axially arranged around the fixing hole 20. The end cover 16 is also provided with a plurality of auxiliary holes 21. The plurality of auxiliary holes 21 are axially arranged on the end surface of the end cover 16 away from the electric drive mechanism 3. The fixing hole 20 and the auxiliary hole 21 are both threaded holes.

[0047] To summarize, the present application sets the drive shaft 32 and the output screw 2 separately, so that the output screw 2 does not need to pass through the transmission mechanism. The output screw 2 is connected to the output sun gear, and the output screw 2 does not need to pass through the intermediate sun gear (the first drive gear 40, the second drive gear 42), so that the diameter of the drive shaft 32 and the intermediate sun gear can be reduced compared to the output sun gear, and the number of external teeth of the first drive gear 40 and the second drive gear 42 is reduced, thereby increasing the speed ratio of the planetary reducer. Under the condition of the same motor performance, the torque output by the swing cylinder will increase.

[0048] By setting a fixing hole 20 and an auxiliary hole 21 on the end face of the output screw rod 2 to connect the working basket, the working basket is connected to the output shaft by bolts, which improves the stability of the installation, improves the safety of the swing cylinder when in use, and realizes secondary protection of the working basket connection.

[0049] The electric drive mechanism 3 is used in conjunction with the brake 33 to achieve rapid response of the swing cylinder to the swing and stop actions. In a sudden emergency, the brake 33 can be used to perform emergency braking on the swing cylinder to achieve a self-locking function at any position.

[0050] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An electrically driven swing cylinder, characterized in that: include, A housing (1), wherein teeth are arranged on the inner wall of the housing (1); An output screw (2), the output screw (2) being coaxially rotatably connected to one end of the housing (1); An electric drive mechanism (3), the electric drive mechanism (3) comprising a drive shaft (32), the electric drive mechanism (3) being used to drive the output screw (2) to rotate; A transmission mechanism (4), the transmission mechanism (4) being arranged between the drive shaft (32) and the output screw (2), the transmission mechanism (4) comprising a plurality of drive gears and a plurality of transmission gears, the transmission gears being meshed between the inner wall of the housing (1) and the drive gears, the transmission gears and the drive gears cooperating with each other to realize a reduction transmission between the output screw (2) and the drive shaft (32).

2. The electrically driven swing cylinder according to claim 1, characterized in that: The transmission mechanism (4) comprises a plurality of transmission groups, wherein one or more transmission gears and a driving gear form a transmission group; along the direction from the driving shaft (32) to the output screw (2), the plurality of transmission groups are sequentially recorded as a first transmission group, an n-1th transmission group, and an nth transmission group, and a fixing pin (46) is provided between the transmission gear and the driving gear in the same transmission group.

3. The electrically driven swing cylinder according to claim 2, characterized in that: In the same transmission group, the transmission gear is located on a side of the driving gear close to the electric drive mechanism (3); the transmission gear in the first transmission group is meshed between the driving shaft (32) and the inner wall of the housing (1); the driving gear in the nth transmission group is connected to the output screw (2); and the transmission gear in the nth transmission group is meshed between the driving gear in the n-1th transmission group and the inner wall of the housing (1).

4. The electrically driven swing cylinder according to claim 3, characterized in that: A connecting column (47) is coaxially connected to the side of the driving gear away from the electric drive mechanism (3), and the connecting column (47) is provided with teeth for meshing with the transmission gear.

5. The electrically driven swing cylinder according to claim 1, characterized in that: A fixing hole (20) and a plurality of auxiliary holes (21) are arranged on the end surface of the output screw rod (2) away from the interior of the housing (1); the fixing hole (20) is arranged coaxially with the output screw rod (2); and the plurality of auxiliary holes (21) are axially arranged around the fixing hole (20).

6. The electrically driven swing cylinder according to claim 2, characterized in that: A partition (10) is arranged inside the shell (1), and a through opening (11) is arranged on the partition (10). The partition (10) divides the interior of the shell (1) into a drive chamber (12) and a transmission chamber (13). The electric drive mechanism (3) is arranged in the drive chamber (12), and the transmission mechanism (4) is arranged in the transmission chamber (13). The drive shaft (32) passes through the partition (10).

7. The electrically driven swing cylinder according to claim 6, characterized in that: The electric drive mechanism (3) further comprises a stator assembly (30) and a rotor assembly (31); the rotor assembly (31) is coaxially fixedly connected to the drive shaft (32); the stator assembly (30) is fixedly connected in the housing (1); and the stator assembly (30) is sleeved outside the rotor assembly (31).

8. The electrically driven swing cylinder according to claim 7, characterized in that: The electric drive mechanism (3) further comprises a brake (33), wherein the brake (33) is arranged in the drive cavity (12), the brake (33) is located on a side of the rotor assembly (31) away from the partition (10), and the brake (33) is connected to the drive shaft (32).

9. The electrically driven swing cylinder according to claim 6, characterized in that: A first limiting ring (14) is connected to the open end of the shell (1) close to the driving chamber (12), and a second limiting ring (15) is connected to the open end of the shell (1) close to the transmission chamber (13).

10. The electrically driven swing cylinder according to claim 9, characterized in that: The inner side walls at both ends of the housing (1) are provided with mounting steps (18), and the first limiting ring (14) and the second limiting ring (15) are both clamped on the mounting steps (18).

11. The electrically driven swing cylinder according to claim 10, characterized in that: A mounting groove (17) is arranged on the end surface of the first limiting ring (14) away from the driving chamber (12); the mounting groove (17) is arranged in an annular shape; a thread is arranged on the side wall of the mounting groove (17) close to the axis of the first limiting ring (14); an end cover (16) is arranged in the mounting groove (17); the end cover (16) is arranged in an annular shape; a locking nut (19) is threadedly connected to the middle part of the first limiting ring (14); a side of the locking nut (19) close to the inside of the shell (1) abuts against the end cover (16) to lock the end cover (16) in the mounting groove (17).

12. The electrically driven swing cylinder according to claim 7, characterized in that: A brake (33) is arranged in the driving chamber (12), and the brake (33) is connected to the driving shaft (32).

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