Hollow output shaft servo motor

Abstract

The invention belongs to the technical field of servo motors, and particularly relates to a hollow output shaft servo motor which comprises a motor shell, a power mechanism is arranged in the motor shell, the power mechanism is in transmission connection with a main shaft, the main shaft is hollow, the main shaft is in transmission connection with an output shaft, the output shaft is rotationally connected to one end of the motor shell, and the output shaft and the main shaft are coaxially arranged. A speed reducing mechanism is arranged between the output shaft and the main shaft, a driving mechanism is arranged on the main shaft, the driving mechanism is electrically connected with the power mechanism, a brake mechanism is arranged on the main shaft, and the speed reducing mechanism, the driving mechanism and the brake mechanism are all arranged in the motor shell. According to the invention, the main shaft is hollow, the requirements of some special equipment for hollow wiring or installation of other parts can be met, and meanwhile, the speed reducing mechanism, the driving mechanism and the brake mechanism are all integrated in the motor shell, so that the construction time is saved on one hand, and on the other hand, the integration degree of the motor is improved, and the size is reduced.

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 be solid, which cannot meet the requirements of some special equipment for hollow wiring or installation of other components, and 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 use 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 driving mechanism is arranged on the main shaft, the driving mechanism is electrically connected to the power mechanism, a braking mechanism is arranged on the main shaft, and the reduction mechanism, the driving mechanism and the braking 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 rear cover which are sequentially connected from top to bottom, and the output shaft holder, the cycloid gear holder, the outer shell, the drive plate mounting seat and the rear cover are fixedly connected.

[0008] Preferably, an installation cavity is circumferentially formed at one end of the outer housing, and the installation cavity is coaxially arranged with the outer housing. The power mechanism includes a stator, which is circumferentially fixed on the inner side wall of the installation cavity and is coaxially arranged with the installation cavity. A rotor is coaxially arranged outside the stator, and the stator and the rotor are magnetically connected. The rotor is circumferentially fixed on the inner side wall of the rotor mounting bracket, and the rotor mounting bracket is located in the installation cavity and is coaxially arranged with the rotor. The main shaft coaxially passes through the rotor mounting bracket and rotates synchronously with the rotor mounting bracket.

[0009] Preferably, the reduction mechanism includes a cycloid gear circumferentially fixed at the inner edge of the cycloid gear cage. The cycloid gear is coaxially arranged with the cycloid gear cage and the main shaft. A cycloid gear plate is arranged at the inner edge of the cycloid gear. The outer edge of the cycloid gear plate meshes with the inner edge of the cycloid gear. An eccentric sleeve is sleeved outside the main shaft, and the eccentric sleeve rotates with the main shaft. The eccentric sleeve is arranged at the inner edge of the cycloid gear plate, and the cycloid gear plate is in transmission connection with the output shaft.

[0010] Preferably, a plurality of first pin shaft holes are circumferentially and equidistantly formed in the cycloid gear plate. The axis of the first pin shaft hole is parallel to the axis of the cycloid gear plate. A connecting pin is inserted into 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 in contact with the inner wall of the first pin shaft hole. The top end of the connecting pin penetrates out of the first pin shaft hole and into a second pin shaft hole formed in the output shaft. A plurality of the second pin shaft holes are circumferentially and equidistantly arranged, and the second pin shaft hole is fixedly connected with the connecting pin.

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

[0012] Preferably, the braking mechanism includes a brake coil fixed on the driving plate mounting seat. A brake caliper is arranged on the brake coil. A brake pad is coaxially fixed on the main shaft, and the brake pad is arranged corresponding to the brake caliper.

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

[0014] Preferably, a second bearing is arranged between the output shaft and the output shaft cage, and a third bearing is arranged 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 hollow, which can meet the requirements of some special equipment for hollow wire routing or installing other components. At the same time, the reduction mechanism, the drive mechanism, and the brake mechanism are all integrated inside the motor housing. On the one hand, it is no longer necessary to assemble the reducer, the driver, and the servo motor before use, saving construction time. On the other hand, the present invention has a high degree of integration and a small volume, and can be used in servo motor application scenarios with a small installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

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

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

[0020] Figure 3 is the bottom view of the reduction mechanism in the present invention;

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

[0022] Among them, 1, main shaft; 2, output shaft; 3, cycloid gear piece; 4, cycloid gear; 5, connecting pin; 6, stator; 7, rotor; 8, code disc; 9, code reader; 10, eccentric sleeve; 11, drive plate; 12, brake pad; 13, first bearing; 14, second bearing; 15, third bearing; 16, output shaft cage; 17, cycloid gear cage; 18, housing; 19, drive plate mounting seat; 20, rear cover; 21, rotor mounting bracket; 22, brake coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Referring to Figures 1 to 4 , the present invention discloses a hollow output shaft servo motor, including: a motor housing, a power mechanism is arranged inside the motor housing, the power mechanism is drivingly connected to a main shaft 1, the main shaft 1 is hollow, the main shaft 1 is drivingly connected to an output shaft 2, the output shaft 2 is rotatably connected to one end of the motor housing, the output shaft 2 is coaxially arranged with the main shaft 1, a speed reduction mechanism is arranged between the output shaft 2 and the main shaft 1, a driving mechanism is arranged on the main shaft 1, the driving mechanism is electrically connected to the power mechanism, a braking mechanism is arranged on the main shaft 1, and the speed reduction mechanism, the driving mechanism, and the braking mechanism are 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, the main shaft 1 drives the output shaft 2 to rotate, and a speed reduction mechanism is arranged between the output shaft 2 and the main shaft 1. The speed reduction mechanism is integrated inside the motor housing, and no external reducer is required. The main shaft 1 can be braked in time through the braking mechanism.

[0027] In the present invention, the main shaft 1 is hollow, which can meet the requirements of some special equipment for hollow wire routing or installing other components. At the same time, the speed reduction mechanism, the driving mechanism, and the braking mechanism are all integrated inside the motor housing. On the one hand, it is not necessary to assemble the reducer, the driver, and the servo motor before use, saving construction time. On the other hand, the present invention has a high degree of integration and a small volume, and can be used in servo motor application scenarios with a small installation space.

[0028] As a further optimized solution, the motor housing includes an output shaft retainer 16, a cycloidal gear retainer 17, a housing body 18, a drive board mounting seat 19, and a rear cover 20 that are sequentially connected from top to bottom. The output shaft retainer 16, the cycloidal gear retainer 17, the housing body 18, the drive board mounting seat 19, and the rear cover 20 are fixedly connected.

[0029] As a further optimized solution, an installation cavity is circumferentially formed at one end of the housing body 18. The installation cavity is coaxially arranged with the housing body 18. The power mechanism includes a stator 6, and the stator 6 is circumferentially fixed on the inner side wall of the installation cavity. The stator 6 is coaxially arranged with the installation cavity. A rotor 7 is coaxially arranged outside the stator 6. The stator 6 and the rotor 7 are magnetically connected. The rotor 7 is circumferentially fixed on the inner side wall of the rotor mounting bracket 21. The rotor mounting bracket 21 is located inside the installation cavity. The rotor mounting bracket 21 is coaxially arranged with the rotor 7. The main shaft 1 coaxially passes through the rotor mounting bracket 21 and rotates synchronously with the rotor mounting bracket 21.

[0030] The outer shell 18 plays an integral bearing role, the stator 6 is fixedly connected to the inner wall of the mounting cavity of the outer shell 18, and the rotor mounting bracket 21 is rotatably connected to the inner edge of the outer shell 18 through the first bearing 13, so that the rotation is smoother; when working, the rotor 7 rotates to drive the rotor mounting bracket 21 to rotate, and the rotor mounting bracket 21 drives the main shaft 1 to rotate.

[0031] A further optimized solution is provided, in which the reduction mechanism includes a cycloidal gear 4 circumferentially fixed to the inner edge of the cycloidal gear holder 17; the cycloidal gear 4 is coaxially arranged with the cycloidal gear holder 17 and the main shaft 1; a cycloidal gear piece 3 is arranged at the inner edge of the cycloidal gear 4; the outer edge of the cycloidal gear piece 3 is meshed with the inner edge of the cycloidal 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 cycloidal gear piece 3; and the cycloidal gear piece 3 is transmission-connected to the output shaft 2.

[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, 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 mesh 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 rotation speed of the output shaft 2 can be reduced and the torque output can be increased, ensuring the stability and accuracy of power transmission.

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

[0035] According to a further optimized solution, the driving mechanism includes a driving plate 11 fixedly connected to a 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 a 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] For a further optimized solution, the braking mechanism includes a braking coil 22 fixedly connected to the driving plate mounting seat 19. A brake caliper is provided on the braking coil 22. A brake pad 12 is coaxially and fixedly connected to the main shaft 1, and the brake pad 12 is arranged corresponding to the brake caliper.

[0038] The braking coil 22 drives the brake caliper to move, and the brake caliper makes frictional contact with the brake pad 12, so that the main shaft 1 is braked to a stop.

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

[0040] For a further optimized solution, a second bearing 14 is provided between the output shaft 2 and the output shaft cage 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 orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present invention.

[0042] The embodiments described above are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A hollow output shaft servo motor, characterized in that, Comprising: A motor housing, within which a power mechanism is provided. The power mechanism is drivingly connected to a main shaft (1). The main shaft (1) is hollow. The main shaft (1) is drivingly connected to an output shaft (2). The output shaft (2) is rotatably connected to one end of the motor housing. The output shaft (2) is coaxially arranged with the main shaft (1). A speed 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 braking mechanism is provided on the main shaft (1). The speed reduction mechanism, the driving mechanism, and the braking mechanism are all arranged within the motor housing.

2. The hollow output shaft servo motor according to claim 1, wherein: The motor housing includes an output shaft holder (16), a cycloidal gear holder (17), a housing body (18), a drive plate mounting seat (19), and a rear cover (20) that are sequentially connected from top to bottom. The output shaft holder (16), the cycloidal gear holder (17), the housing body (18), the drive plate mounting seat (19), and the rear cover (20) are fixedly connected to each other.

3. The hollow output shaft servo motor according to claim 2, characterized in that: An installation cavity is circumferentially formed at one end of the housing body (18). The installation cavity is coaxially arranged with the housing body (18). The power mechanism includes a stator (6). The stator (6) is circumferentially fixed to the inner sidewall of the installation cavity. The stator (6) is coaxially arranged with the installation cavity. A rotor (7) is coaxially arranged outside the stator (6). The stator (6) and the rotor (7) are magnetically connected. The rotor (7) is circumferentially fixed to the inner sidewall of a rotor mounting bracket (21). The rotor mounting bracket (21) is located within the installation cavity. The rotor mounting bracket (21) is coaxially arranged with the rotor (7). The main shaft (1) coaxially passes through the rotor mounting bracket (21) and rotates synchronously with the rotor mounting bracket (21).

4. The hollow output shaft servo motor according to claim 2, wherein: The speed reduction mechanism includes a cycloidal gear (4) circumferentially fixed to the inner edge of the cycloidal gear holder (17). The cycloidal gear (4) is coaxially arranged with the cycloidal gear holder (17) and the main shaft (1). A cycloidal gear plate (3) is provided at the inner edge of the cycloidal gear (4). The outer edge of the cycloidal gear plate (3) meshes with the inner edge of the cycloidal gear (4). An eccentric sleeve (10) is sleeved outside 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 cycloidal gear plate (3). The cycloidal gear plate (3) is drivingly connected to the output shaft (2).

5. A hollow output shaft servo motor according to claim 4, characterized in that: A plurality of first pin shaft holes are circumferentially and equally spaced on the cycloid gear piece (3). The axes of the first pin shaft holes are arranged parallel to the axis of the cycloid gear piece (3). A connecting pin (5) is inserted into 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 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 is inserted into a second pin shaft hole. The second pin shaft hole is formed in the output shaft (2). The plurality of second pin shaft holes are circumferentially and equally spaced. The second pin shaft hole is fixedly connected to the connecting pin (5).

6. The hollow output shaft servo motor according to claim 3, wherein: 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). The code disk (8) of the code reader (9) is fixedly connected to the main shaft (1) in the same group.

7. The hollow output shaft servo motor according to claim 2, wherein: The braking mechanism includes a brake coil (22) fixedly connected to the driving plate mounting seat (19). A brake caliper is arranged on the brake coil (22). A brake pad (12) is coaxially and fixedly connected to the main shaft (1). The brake pad (12) is arranged corresponding to the brake caliper.

8. The hollow output shaft servo motor according to claim 3, characterized in that: A first bearing (13) is arranged between the rotor mounting bracket (21) and the outer housing (18).

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

Images