A hollow shaft servo motor

Abstract

The present invention belongs to the technical field of servo motors, and in particular relates to a hollow shaft servo motor, comprising: a motor housing, a power mechanism provided in the motor housing, the power mechanism being transmission-connected to a main shaft, the main shaft being hollow, the main shaft being transmission-connected to an output shaft, the output shaft being rotationally connected to one end of the motor housing, the output shaft being coaxially provided with the main shaft, a reduction mechanism being provided between the output shaft and the main shaft, a drive mechanism being provided on the main shaft, the drive mechanism being electrically connected to the power mechanism, a brake mechanism being provided on the main shaft, the reduction mechanism, the drive mechanism, and the brake mechanism being all provided in the motor housing. In the present invention, the main shaft is hollow, which can meet the requirements of some special equipment for hollow wiring or installation of other components. At the same time, the reduction mechanism, the drive mechanism, and the brake mechanism are all integrated inside the motor housing, which, on the one hand, saves construction time, and on the other hand, improves the integration of the present invention and reduces its volume.

Description

Technical Field

[0001] The invention belongs to the technical field of servo motors, and in particular relates to a hollow shaft servo motor. Background Art

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device.

[0003] In the prior art, the output shaft of the servo motor is usually set to a solid setting, which cannot meet the requirements of some special equipment for hollow wiring or installation of other components. In addition, the servo motor often needs to be used in conjunction with a reducer and a driver. Before the servo motor is used, the reducer, driver and servo motor need to be assembled, which increases the usage time. For this reason, a hollow shaft servo motor is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a hollow shaft servo motor to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A hollow shaft servo motor comprises: a motor housing, a power mechanism is arranged in the motor housing, the power mechanism is transmission-connected to a main shaft, the main shaft is hollow, the main shaft is transmission-connected to an output shaft, the output shaft is rotationally connected to one end of the motor housing, the output shaft is coaxially arranged with the main shaft, a reduction mechanism is arranged between the output shaft and the main shaft, a drive mechanism is arranged on the main shaft, the drive mechanism is electrically connected to the power mechanism, a brake mechanism is arranged on the main shaft, and the reduction mechanism, the drive mechanism and the brake mechanism are all arranged in the motor housing.

[0007] Preferably, the motor housing includes an output shaft holder, a cycloid gear holder, an outer shell, a drive plate mounting seat, and a back cover connected in sequence from top to bottom, and the output shaft holder, the cycloid gear holder, the outer shell, the drive plate mounting seat and the back cover are fixedly connected.

[0008] Preferably, a mounting cavity is circumferentially opened at one end of the outer shell, and the mounting cavity is coaxially arranged with the outer shell. The power mechanism includes a stator, and the stator is circumferentially fixed to the inner side wall of the mounting cavity. The stator and the mounting cavity are coaxially arranged. A rotor is coaxially arranged on the outside of the stator. The stator and the rotor are magnetically connected. The rotor is circumferentially fixed to the inner side wall of the rotor mounting bracket. The rotor mounting bracket is located in the mounting cavity. The rotor mounting bracket is coaxially arranged with the rotor. The main shaft is coaxially inserted into the rotor mounting bracket and rotates synchronously with the rotor mounting bracket.

[0009] Preferably, the reduction mechanism includes a cycloidal gear circumferentially fixed to the inner edge of the cycloidal gear holder, the cycloidal gear is coaxially arranged with the cycloidal gear holder and the main shaft, a cycloidal gear plate is provided at the inner edge of the cycloidal gear, the outer edge of the cycloidal gear plate is meshed with the inner edge of the cycloidal gear, an eccentric sleeve is provided on the outer side of the main shaft, the eccentric sleeve rotates with the main shaft, the eccentric sleeve is provided at the inner edge of the cycloidal gear plate, and the cycloidal gear plate is connected to the output shaft in a transmission manner.

[0010] Preferably, a plurality of first pin shaft holes are circumferentially evenly spaced on the cycloid gear plate, the axis of the first pin shaft hole is arranged parallel to the axis of the cycloid gear plate, a connecting pin is passed through the first pin shaft hole, the inner diameter of the first pin shaft hole is larger than the outer diameter of the connecting pin, the connecting pin is contacted with the inner wall of the first pin shaft hole, the top end of the connecting pin passes through the first pin shaft hole and passes into the second pin shaft hole, the second pin shaft hole is opened on the output shaft, a plurality of second pin shaft holes are circumferentially evenly spaced, and the second pin shaft hole is fixedly connected to the connecting pin.

[0011] Preferably, the driving mechanism includes a driving plate fixedly connected to the driving plate mounting seat, the driving plate is electrically connected to the rotor, the driving plate is electrically connected to an external power supply, the driving plate is electrically connected to a code reader, and the code disk of the code reader is fixedly connected to the main shaft in the same group.

[0012] Preferably, the brake mechanism includes a brake coil fixedly connected to the drive plate mounting seat, a brake caliper is provided on the brake coil, a brake pad is coaxially fixed to the main shaft, and the brake pad is provided corresponding to the brake caliper.

[0013] Preferably, a first bearing is provided between the rotor mounting bracket and the outer shell.

[0014] Preferably, a second bearing is provided between the output shaft and the output shaft holder, and a third bearing is provided between the output shaft and the main shaft.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects:

[0016] In the present invention, the main shaft is hollowed out to meet the needs of some special equipment for hollow wiring or installation of other components. At the same time, the reduction mechanism, drive mechanism and brake mechanism are all integrated inside the motor housing. On the one hand, there is no need to assemble the reducer, driver and servo motor before use, which saves construction time. On the other hand, the present invention has high integration and small size, and can be used in servo motor application scenarios with smaller installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0018] Figure 1 It is the front view of the present invention;

[0019] Figure 2 Schematic diagram of the internal structure of the present invention;

[0020] Figure 3 It is a bottom view of the speed reduction mechanism of the present invention;

[0021] Figure 4 Schematic diagram of the overall structure of the speed reduction mechanism in the present invention;

[0022] Among them, 1. Main shaft; 2. Output shaft; 3. Cycloid gear plate; 4. Cycloid gear; 5. Connecting pin; 6. Stator; 7. Rotor; 8. Code disk; 9. Code reader; 10. Eccentric sleeve; 11. Drive plate; 12. Brake pad; 13. First bearing; 14. Second bearing; 15. Third bearing; 16. Output shaft holder; 17. Cycloid gear holder; 18. Outer shell; 19. Drive plate mounting seat; 20. Back cover; 21. Rotor mounting bracket; 22. Brake coil. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figures 1 to 4 The present invention discloses a hollow shaft servo motor, comprising: a motor housing, a power mechanism arranged inside the motor housing, the power mechanism being transmission-connected to a main shaft 1, the main shaft 1 being hollow, the main shaft 1 being transmission-connected to an output shaft 2, the output shaft 2 being rotationally connected to one end of the motor housing, the output shaft 2 being coaxially arranged with the main shaft 1, a reduction mechanism being arranged between the output shaft 2 and the main shaft 1, a driving mechanism being arranged on the main shaft 1, the driving mechanism being electrically connected to the power mechanism, a brake mechanism being arranged on the main shaft 1, and the reduction mechanism, the driving mechanism and the brake mechanism being all arranged inside the motor housing.

[0026] The driving mechanism controls the movement of the power mechanism and collects the position signal of the main shaft 1. The power mechanism drives the main shaft 1 to rotate, and the main shaft 1 drives the output shaft 2 to rotate. A reduction mechanism is provided between the output shaft 2 and the main shaft 1. The reduction mechanism is integrated into the motor housing, and an external reducer is not required. The main shaft 1 can be stopped in time through the brake mechanism.

[0027] In the present invention, the main shaft 1 is hollow, which can meet the needs of some special equipment for hollow wiring or installation of other components. At the same time, the reduction mechanism, drive mechanism and brake mechanism are all integrated inside the motor housing. On the one hand, there is no need to assemble the reducer, driver and servo motor before use, which saves construction time. On the other hand, the present invention has high integration and small size, and can be used in servo motor application scenarios with smaller installation space.

[0028] A further optimized solution is that the motor housing includes an output shaft holder 16, a cycloid gear holder 17, an outer shell 18, a drive plate mounting seat 19, and a back cover 20 connected in sequence from top to bottom, and the output shaft holder 16, the cycloid gear holder 17, the outer shell 18, the drive plate mounting seat 19 and the back cover 20 are fixedly connected.

[0029] A further optimized solution is provided, in which a mounting cavity is circumferentially opened at one end of the outer shell 18, and the mounting cavity is coaxially arranged with the outer shell 18. The power mechanism includes a stator 6, which is circumferentially fixed to the inner side wall of the mounting cavity. The stator 6 is coaxially arranged with the mounting cavity. A rotor 7 is coaxially arranged on the outer side of the stator 6. The stator 6 and the rotor 7 are magnetically connected. The rotor 7 is circumferentially fixed to the inner side wall of the rotor mounting bracket 21. The rotor mounting bracket 21 is located in the mounting cavity. The rotor mounting bracket 21 is coaxially arranged with the rotor 7. The main shaft 1 is coaxially passed through the rotor mounting bracket 21 and rotates synchronously with the rotor mounting bracket 21.

[0030] The outer shell 18 plays an integral load-bearing role. The stator 6 is fixed to the inner side wall of the mounting cavity of the outer shell 18. The rotor mounting bracket 21 is rotatably connected to the inner edge of the outer shell 18 through the first bearing 13, which makes the rotation smoother. During operation, the rotation of the rotor 7 drives the rotor mounting bracket 21 to rotate, and the rotor mounting bracket 21 drives the main shaft 1 to rotate.

[0031] To further optimize the solution, the reduction mechanism includes a cycloid gear 4 circumferentially fixed to the inner edge of the cycloid gear holder 17. The cycloid gear 4 is coaxially arranged with the cycloid gear holder 17 and the main shaft 1. A cycloid gear piece 3 is provided at the inner edge of the cycloid gear 4. The outer edge of the cycloid gear piece 3 is meshed with the inner edge of the cycloid gear 4. An eccentric sleeve 10 is provided on the outer side of the main shaft 1. The eccentric sleeve 10 rotates with the main shaft 1. The eccentric sleeve 10 is arranged at the inner edge of the cycloid gear piece 3, and the cycloid gear piece 3 is connected to the output shaft 2 in transmission.

[0032] A further optimized solution is that a plurality of first pin shaft holes are circumferentially evenly spaced on the cycloid gear plate 3, the axis of the first pin shaft hole is arranged parallel to the axis of the cycloid gear plate 3, a connecting pin 5 is passed through the first pin shaft hole, the inner diameter of the first pin shaft hole is larger than the outer diameter of the connecting pin 5, the connecting pin 5 is arranged in contact with the inner wall of the first pin shaft hole, the top end of the connecting pin 5 passes through the first pin shaft hole and passes into the second pin shaft hole, the second pin shaft hole is opened on the output shaft 2, and a plurality of second pin shaft holes are circumferentially evenly spaced, and the second pin shaft hole is fixedly connected to the connecting pin 5.

[0033] The rotation of the main shaft 1 drives the eccentric sleeve 10 to rotate, and the eccentric sleeve 10 drives the position of the cycloid gear piece 3 to continuously shift. At this time, the teeth on the outer edge of the cycloid gear piece 3 engage with the inner edge of the cycloid gear 4, thereby realizing the rotation of the cycloid gear piece 3. The rotation of the cycloid gear piece 3 drives the connecting pin 5 to move, and then drives the output shaft 2 to rotate. Through the setting of the cycloid gear piece 3 and the cycloid gear 4, the speed of the output shaft 2 can be reduced and the torque output can be increased, ensuring the smoothness and accuracy of power transmission.

[0034] The provision of the second bearing 14 and the third bearing 15 allows the output shaft 2 to rotate more smoothly.

[0035] A further optimized solution is that the driving mechanism includes a driving plate 11 fixedly connected to the driving plate mounting base 19, the driving plate 11 is electrically connected to the rotor 7, the driving plate 11 is electrically connected to the external power supply, the driving plate 11 is electrically connected to the code reader 9, and the code disk 8 of the code reader 9 is fixedly connected to the main shaft 1 in the same group.

[0036] The main shaft 1 drives the code disk 8 to rotate, and the code reader 9 reads the rotation information of the code disk 8 and transmits the signal to the driving board 11. The driving board 11 controls the magnitude and direction of the current to realize the control of the servo motor.

[0037] According to a further optimization scheme, the brake mechanism includes a brake coil 22 fixedly connected to the drive plate mounting seat 19, a brake caliper is provided on the brake coil 22, and a brake pad 12 is coaxially fixed to the main shaft 1, and the brake pad 12 is provided corresponding to the brake caliper.

[0038] The brake coil 22 drives the brake caliper to move, and the brake caliper and the brake pad 12 are in friction contact, thereby stopping the main shaft 1.

[0039] In a further optimized solution, a first bearing 13 is provided between the rotor mounting bracket 21 and the outer shell 18 .

[0040] According to a further optimized solution, a second bearing 14 is provided between the output shaft 2 and the output shaft retainer 16 , and a third bearing 15 is provided between the output shaft 2 and the main shaft 1 .

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 invention.

[0042] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A hollow shaft servo motor, characterized in that: include: A motor housing, wherein a power mechanism is provided in the motor housing, the power mechanism is connected to a main shaft (1) in a transmission manner, the main shaft (1) is hollow, the main shaft (1) is connected to an output shaft (2) in a transmission manner, the output shaft (2) is rotatably connected to one end of the motor housing, the output shaft (2) is coaxially provided with the main shaft (1), a reduction mechanism is provided between the output shaft (2) and the main shaft (1), a driving mechanism is provided on the main shaft (1), the driving mechanism is electrically connected to the power mechanism, a brake mechanism is provided on the main shaft (1), and the reduction mechanism, the driving mechanism and the brake mechanism are all provided in the motor housing; The motor housing comprises an output shaft holder (16), a cycloid gear holder (17), an outer shell (18), a drive plate mounting seat (19), and a rear cover (20) which are sequentially connected from top to bottom, wherein the output shaft holder (16), the cycloid gear holder (17), the outer shell (18), the drive plate mounting seat (19), and the rear cover (20) are fixedly connected; A mounting cavity is circumferentially formed at one end of the outer shell (18), and the mounting cavity is coaxially arranged with the outer shell (18). The power mechanism includes a stator (6), and the stator (6) is circumferentially fixed to the inner side wall of the mounting cavity. The stator (6) and the mounting cavity are coaxially arranged. A rotor (7) is coaxially arranged on the outer side of the stator (6). The stator (6) and the rotor (7) are magnetically connected. The rotor (7) is circumferentially fixed to the inner side wall of a rotor mounting bracket (21). The rotor mounting bracket (21) is located in the mounting cavity. The rotor mounting bracket (21) and the rotor (7) are coaxially arranged. The main shaft (1) is coaxially passed through the rotor mounting bracket (21) and rotates synchronously with the rotor mounting bracket (21). The speed reduction mechanism comprises a cycloid gear (4) circumferentially fixed to the inner edge of the cycloid gear holder (17), the cycloid gear (4) is coaxially arranged with the cycloid gear holder (17) and the main shaft (1), a cycloid gear plate (3) is arranged at the inner edge of the cycloid gear (4), the outer edge of the cycloid gear plate (3) is meshed with the inner edge of the cycloid gear (4), an eccentric sleeve (10) is provided on the outer side of the main shaft (1), the eccentric sleeve (10) rotates with the main shaft (1), the eccentric sleeve (10) is arranged at the inner edge of the cycloid gear plate (3), and the cycloid gear plate (3) is transmission-connected to the output shaft (2); The cycloid gear plate (3) is provided with a plurality of first pin shaft holes at equal intervals in the circumferential direction, the axis of the first pin shaft hole is arranged parallel to the axis of the cycloid gear plate (3), a connecting pin (5) is passed through the first pin shaft hole, the inner diameter of the first pin shaft hole is larger than the outer diameter of the connecting pin (5), the connecting pin (5) is contacted with the inner wall of the first pin shaft hole, the top end of the connecting pin (5) passes through the first pin shaft hole and passes through the second pin shaft hole, the second pin shaft hole is provided on the output shaft (2), the plurality of second pin shaft holes are arranged at equal intervals in the circumferential direction, and the second pin shaft hole is fixedly connected to the connecting pin (5); The driving mechanism includes a driving plate (11) fixedly connected to the driving plate mounting seat (19), the driving plate (11) is electrically connected to the rotor (7), the driving plate (11) is electrically connected to an external power supply, the driving plate (11) is electrically connected to a code reader (9), and the code disk (8) of the code reader (9) is fixedly connected to the main shaft (1) in the same group; The brake mechanism comprises a brake coil (22) fixedly connected to the drive plate mounting seat (19), a brake caliper is provided on the brake coil (22), a brake pad (12) is coaxially fixedly connected to the main shaft (1), and the brake pad (12) is provided corresponding to the brake caliper.

2. The hollow shaft servo motor according to claim 1, characterized in that: A first bearing (13) is provided between the rotor mounting bracket (21) and the outer shell (18).

3. The hollow shaft servo motor according to claim 1, characterized in that: A second bearing (14) is provided between the output shaft (2) and the output shaft retainer (16), and a third bearing (15) is provided between the output shaft (2) and the main shaft (1).

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