Double-motor tandem type heavy-load electric cylinder

Abstract

The utility model relates to the technical field of heavy-load electric cylinders, in particular to a double-motor tandem type heavy-load electric cylinder. According to the technical scheme, the hydraulic cylinder comprises a cylinder barrel, a piston rod installed in the cylinder barrel in a sliding mode, a lead screw rotationally installed in the cylinder barrel and in threaded connection with the piston rod, and a first motor assembly and a second motor assembly which are installed on one side of the cylinder barrel and are connected in series. The double motors are connected in series, output torque and power are superposed under the condition that radial space is not increased, power performance of the electric cylinder is improved, and the electric cylinder has better load capacity. And under the same output requirement, a motor with a smaller size can be selected for the electric cylinder, the radial space is reduced, the overall structure is more compact, and the space utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty electric cylinder technology, and in particular to a dual-motor series heavy-duty electric cylinder. Background Technology

[0002] Flight simulators and ship simulators need to be able to simulate six degrees of freedom of motion in space, and are characterized by high precision and large load capacity. As the driving component, the linear actuator is the core of the simulator. Therefore, the simulator has extremely high requirements for the performance of the linear actuator, including driving force, operating speed (single cylinder speed can reach 700mm / s), response speed, control precision, stability, and reliability.

[0003] Currently, the linear actuators used in flight simulators and ship simulators mainly take the following three forms:

[0004] The first type is the pneumatic-electric integrated cylinder, which uses both electric and pneumatic power sources. This type of cylinder uses a single motor as the core drive element and can be further subdivided into two main categories based on the motor's drive method: reciprocating and linear. In the reciprocating type, the motor is mounted on the side of the cylinder body and transmits power to the cylinder via a synchronous pulley; in the linear type, the motor and cylinder are directly connected in series via a coupling. Regardless of whether it is a linear or reciprocating type, the cylinder body is filled with compressed air as an auxiliary power source.

[0005] Secondly, the electric cylinder is used as the power source, and the pneumatic cylinder is used as the auxiliary support. The electric cylinders selected in this system are mostly single-motor linear electric cylinders. The motor is placed at the tail of the cylinder body and connected to the main body of the electric cylinder through a coupling. The electric cylinders used meet the speed requirements, but the single cylinder load capacity is limited.

[0006] Third, the hydraulic cylinder is used as the power source, and a servo hydraulic cylinder is selected, which has a wide load coverage range. Summary of the Invention

[0007] The purpose of this invention is to address the problems existing in the background technology by proposing a dual-motor series heavy-duty electric cylinder.

[0008] The technical solution of this utility model: A dual-motor series heavy-duty electric cylinder, comprising a cylinder barrel, a piston rod slidably installed in the cylinder barrel, a lead screw rotatably installed in the cylinder barrel and threadedly connected to the piston rod, and further comprising:

[0009] A first motor assembly and a second motor assembly are installed on one side of the cylinder and connected in series. The first motor assembly includes a first motor stator fixedly installed on one side of the cylinder, and a first motor rotor rotatably installed inside the first motor stator. The second motor assembly includes a second motor stator, and a second motor rotor rotatably installed inside the second motor stator. The first motor rotor and the second motor rotor are fixedly connected to a lead screw.

[0010] Optionally, a motor front end cover is fixedly installed on one side of the cylinder. Multiple pull rods are fixedly installed on the motor front end cover. A motor rear end cover is fixedly installed at one end of each pull rod, and a connecting end cover is fixedly installed in the middle of each pull rod. The first motor stator is fixedly installed between the motor rear end cover and the connecting end cover, and the second motor stator is fixedly installed between the motor front end cover and the connecting end cover. A nut is threaded onto one end of each pull rod, and the nut abuts against one end of the motor front end cover.

[0011] Optionally, a first encoder is fixedly installed on the shaft end of the lead screw, the first encoder is fixedly connected to the rear end cover of the motor, a ball bearing is fixedly installed on the rear end cover of the motor, the inner ring of the ball bearing is fixedly connected to the lead screw, a first retaining ring is installed on the right side of the ball bearing, and a lock nut is threaded onto the lead screw.

[0012] Optionally, the left side of the first motor rotor is fixedly connected to a locking nut, and a first sleeve and a second sleeve are fixedly installed on both sides of the connecting end cover. The right side of the first motor rotor is close to the second sleeve and is axially fixedly connected to the second sleeve.

[0013] Optionally, the left side of the second motor rotor is close to the first sleeve, and the right side of the second motor rotor is axially fixed to the front end cover of the motor by a second retaining ring.

[0014] Optionally, a set of double-row angular contact ball bearings is fixedly installed inside the connecting end cover, the inner ring of the double-row angular contact ball bearings is fixedly connected to the lead screw, and a second encoder is fixedly installed on the connecting end cover, the second encoder being fixedly connected to the lead screw.

[0015] Optionally, two sets of tapered roller bearings are fixedly installed on the front end cover of the motor, and the inner ring of one of the tapered roller bearings is axially fastened to the front end cover of the motor by a second retaining ring.

[0016] Optionally, a bushing is fixedly installed inside the front end cover of the motor. One side of the bushing abuts against the inner ring of the tapered roller bearing, and the other side of the bushing is positioned with the lead screw through a shoulder.

[0017] Optionally, a bearing end cover is fixedly installed on the right side of the motor front end cover.

[0018] Optionally, a junction box is fixedly installed on the upper end face of the second motor assembly, and the second motor assembly is connected to the piston rod by a first screw.

[0019] Optionally, a lower ear plug assembly is fixedly installed on the rear end cover of the motor, a cylinder head assembly is installed on one side of the cylinder, and an upper ear plug assembly is fixedly installed on the piston rod.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] By employing dual motors in series, the output torque and power are superimposed without increasing the radial space, improving the power performance of the electric cylinder and giving it a better load capacity. Under the same output requirements, the electric cylinder in this invention patent can use a smaller motor, reducing the radial space and making the overall structure more compact, thus improving space utilization.

[0022] Compared to a single-motor electric cylinder driven by pure electricity, the electric cylinder in this invention uses a first motor assembly and a second motor connected in series. In the event of a failure of one motor, the other motor can still work, which improves the reliability and stability of the electric cylinder and enhances the fault tolerance of the system to a certain extent.

[0023] Compared to a single-motor electric cylinder driven by pure electricity, the electric cylinder in this invention patent uses a first motor assembly and a second motor assembly connected in series. By controlling the two motors simultaneously, the motor speed can be adjusted more precisely, thereby achieving better motion control.

[0024] Compared to pneumatic-electric integrated electric cylinders, the first and second motor assemblies in this invention are directly connected to the lead screw, eliminating the need for additional transmission components. This results in a more compact overall structure while ensuring high power output, and reduces additional friction and losses.

[0025] Compared to pneumatic-electric integrated electric cylinders, the motor used in this invention patent adopts a direct-drive method, which enables the encoder to directly and effectively feedback the displacement of the lead screw, thereby achieving efficient and stable linear motion.

[0026] Compared to hydraulic cylinders, this invention can achieve more precise position control under the same load-bearing capacity. Since there is no hydraulic oil, maintenance is relatively simple. Moreover, while hydraulic cylinders require the hydraulic pump to keep running even when not in use, this invention only consumes electrical energy when in operation, making it more energy-efficient than hydraulic cylinders. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an electric cylinder.

[0028] Figure 2 A schematic diagram of the structure of the lower earpiece;

[0029] Figure 3 This is a structural schematic diagram of the motor connection diagram;

[0030] Figure 4 This is a schematic diagram showing the connection between the motor assembly and the cylinder.

[0031] Figure 5 Diagram showing the connection between the motor assembly and the piston rod;

[0032] Figure 6 This is a schematic diagram of the motor assembly.

[0033] Reference numerals: 1. Lower earpiece assembly; 2. First motor assembly; 3. Second motor assembly; 4. Junction box; 5. Cylinder; 6. Piston rod; 7. Cylinder head assembly; 8. Upper earpiece assembly; 9. Lower earpiece; 10. Hinge shaft; 11. Second screw; 12. Third screw; 13. Connecting end cover; 14. Pull rod; 15. Bolt; 16. First screw; 17. Motor rear end cover; 18. Ball bearing; 19. First retaining ring; 20. Locking nut; 21. First motor rotor; 22. First motor stator; 23. Double row angular contact ball bearing; 24. First sleeve; 25. Second motor rotor; 26. Second motor stator; 27. Motor front end cover; 28. Nut; 29. ​​Bushing; 30. Bearing end cover; 31. Tapered roller bearing; 32. Second retaining ring; 33. Second encoder; 34. Second sleeve; 35. Lead screw; 36. First encoder. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Examples, such as Figures 1 to 6 As shown, the present invention proposes a dual-motor series heavy-duty electric cylinder, which includes a cylinder 5, a piston rod 6 slidably installed in the cylinder 5, and a lead screw 35 rotatably installed in the cylinder 5 and threadedly connected to the piston rod 6. When the lead screw 35 rotates, it can drive the piston rod 6 to move.

[0036] This embodiment also includes a first motor assembly 2 and a second motor assembly 3 installed on one side of the cylinder 5 and connected in series. The first motor assembly 2 includes a first motor stator 22 fixedly installed on one side of the cylinder 5, and a first motor rotor 21 rotatably installed inside the first motor stator 22. The second motor assembly 3 includes a second motor stator 26, and a second motor rotor 25 rotatably installed inside the second motor stator 26. The first motor rotor 21 and the second motor rotor 25 are fixedly connected to a lead screw 35. When the first motor rotor 21 and the second motor rotor 25 rotate, they can drive the lead screw 35 to rotate, and the rotating lead screw 35 will drive the piston rod 6 to move.

[0037] The first motor stator 22 is installed between the rear end cover 17 and the connecting end cover 13, and the second motor stator 26 is installed between the connecting end cover 13 and the front end cover 27. The pull rod 14 passes through the connecting end cover 13 and the rear end cover 17 of the motor from the side of the front end cover 27, and is fastened on the front end cover 27 by the nut 28, so as to realize the series connection of the first motor assembly 2 and the second motor assembly.

[0038] The first encoder 36 is installed on the shaft end of the lead screw 35. The inner ring of the ball bearing 18 mates with the lead screw 35, and the outer ring of the ball bearing 18 mates with the rear end cover 17 of the motor. The first retaining ring 19 is located on the right side of the ball bearing 18, close to the inner ring of the bearing. A shim can be used to adjust the clearance between the first retaining ring 19 and the ball bearing 18. The locking nut 20 is installed on the lead screw 35 to provide a directional preload for each component installed on the lead screw 35 and to adjust the bearing installation clearance.

[0039] The first motor rotor 21 is installed inside the first motor stator 22. The left side of the first motor rotor 21 is engaged with the locking nut 20, and the right side is close to the second sleeve 34, and is axially fixed.

[0040] The second motor rotor 25 is installed inside the second motor stator 26. The left side of the second motor rotor 25 is close to the first sleeve 24, and the right side is axially fixed by the second retaining ring 32.

[0041] The connecting end cover 13 is equipped with a set of double row angular contact ball bearings 23. The inner ring of the double row angular contact ball bearing 23 is engaged with the lead screw 35. The left and right sides of the inner ring of the double row angular contact ball bearing 23 are respectively close to the second sleeve 34 and the second encoder 33. Shims can be used to adjust the gap between the second sleeve 34 and the double row angular contact ball bearing 23.

[0042] The front cover 27 of the motor is equipped with two sets of tapered roller bearings 31. The two sets of tapered roller bearings 31 are arranged back to back. The inner ring of the left tapered roller bearing 31 is axially fastened by the second retaining ring 32. The gap between the second retaining ring 32 and the tapered roller bearing 31 can be adjusted by using shims. The axial force borne by the lead screw 35 is directly applied to the front cover 27 of the motor through the tapered roller bearing 31.

[0043] The left side of the bushing 29 abuts against the inner ring of the tapered roller bearing 31, while the right side is axially positioned by the shoulder of the lead screw 35. A bearing end cover 30 is installed on the right side of the motor front cover 27. The bearing end cover 30 prevents external impurities from entering the motor and also prevents lubricating oil leakage.

[0044] A junction box 4 is fixedly installed on the upper end face of the second motor assembly 3, and the second motor assembly 3 is connected to the piston rod 6 by the first screw 16. A lower ear plug assembly 1 is fixedly installed on the rear end cover 17 of the motor, a cylinder head assembly 7 is installed on one side of the cylinder 5, and an upper ear plug assembly 8 is fixedly installed on the piston rod 6.

[0045] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A double-motor tandem type heavy load electric cylinder comprising a cylinder tube (5), a piston rod (6) slidingly installed in the cylinder tube (5), and a screw rod (35) rotatably installed in the cylinder tube (5) and threadedly connected with the piston rod (6), characterized in that, Also include: The first motor assembly (2) and the second motor assembly (3) are installed on one side of the cylinder (5) and are connected in series, the first motor assembly (2) includes a first motor stator (22) fixedly installed on one side of the cylinder (5), a first motor rotor (21) is rotatably installed in the first motor stator (22), the second motor assembly (3) includes a second motor stator (26), a second motor rotor (25) is rotatably installed in the second motor stator (26), the first motor rotor (21) and the second motor rotor (25) are fixedly connected with the lead screw (35).

2. The dual-motor series type heavy duty electric cylinder according to claim 1, characterized by One side of the cylinder (5) is fixedly installed with a motor front end cover (27), a plurality of pull rods (14) are fixedly installed on the motor front end cover (27), one end of the pull rod (14) is fixedly installed with a motor rear end cover (17), the middle part of the pull rod (14) is fixedly installed with a connecting end cover (13), the first motor stator (22) is fixedly installed between the motor rear end cover (17) and the connecting end cover (13), the second motor stator (26) is fixedly installed between the motor front end cover (27) and the connecting end cover (13), one end of the pull rod (14) is threadedly connected with a nut (28), the nut (28) abuts against one end of the motor front end cover (27).

3. A dual-motor series type heavy duty electric cylinder according to claim 2, characterized by The shaft end of the lead screw (35) is fixedly installed with a first encoder (36), the first encoder (36) is fixedly connected with the motor rear end cover (17), the motor rear end cover (17) is fixedly installed with a ball bearing (18), the inner ring of the ball bearing (18) is fixedly connected with the lead screw (35), the right side of the ball bearing (18) is installed with a first stop ring (19), the lead screw (35) is threadedly connected with a locking nut (20).

4. The dual-motor series type heavy duty electric cylinder according to claim 3, characterized by The left side of the first motor rotor (21) is fixedly connected with the locking nut (20), the two sides of the connecting end cover (13) are fixedly installed with a first sleeve (24) and a second sleeve (34), the right side of the first motor rotor (21) abuts against and is axially fixedly connected with the second sleeve (34), the left side of the second motor rotor (25) is close to the first sleeve (24), the right side of the second motor rotor (25) is axially fixed with the motor front end cover (27) through a second stop ring (32).

5. A dual-motor series type heavy duty electric cylinder according to claim 4, wherein A set of double-row angular contact ball bearings (23) are fixedly installed in the connecting end cover (13), the inner ring of the double-row angular contact ball bearing (23) is fixedly connected with the lead screw (35), a second encoder (33) is fixedly installed on the connecting end cover (13), the second encoder (33) is fixedly connected with the lead screw (35).

6. A dual-motor series type heavy duty electric cylinder according to claim 5, wherein Two sets of tapered roller bearings (31) are fixedly installed on the motor front end cover (27), the inner ring of one of the tapered roller bearings (31) is axially fastened with the motor front end cover (27) through a second stop ring (32).

7. A dual-motor series type heavy duty electric cylinder according to claim 6, wherein The motor front end cover (27) is fixedly installed with a shaft sleeve (29), one side of the shaft sleeve (29) abuts against the inner ring of the tapered roller bearing (31), and the other side of the shaft sleeve (29) is positioned with the screw rod (35) through a shaft shoulder.

8. A dual-motor series type heavy duty electric cylinder according to claim 7, characterized by The right side of the motor front end cover (27) is fixedly installed with a bearing end cover (30).

9. A dual-motor series type heavy duty electric cylinder according to claim 8, wherein The upper end face of the second motor assembly (3) is fixedly installed with a junction box (4), and the second motor assembly (3) is connected with the piston rod (6) through a first screw (16).

10. The dual-motor series type heavy duty electric cylinder according to claim 9, characterized by The motor rear end cover (17) is fixedly installed with a lower earplug assembly (1), one side of the cylinder barrel (5) is installed with a cylinder head assembly (7), and the piston rod (6) is fixedly installed with an upper earplug assembly (8).

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