A motor structure with centrifugal brake and electromagnetic brake

Abstract

This application relates to the technical field of motor structures, and in particular to a motor structure with a centrifugal brake and an electromagnetic brake, comprising a motor body, a rear cover, and a drive shaft. The rear cover seals the rear side of the motor body, and the drive shaft passes through the center of the motor body. A mounting shell is installed on the outer side of the rear cover, and a connecting shell is provided on the side of the mounting shell away from the rear cover. A mounting cavity is formed between the mounting shell and the connecting shell. One end of the drive shaft moves through the side wall of the mounting shell and the side wall of the connecting shell, respectively. A centrifugal brake is installed on the outer wall of the drive shaft and is located in the mounting cavity. An electromagnetic brake is installed on the end of the connecting shell away from the mounting shell. A first oil seal is installed on the end of the mounting shell near the drive shaft, and a second oil seal is installed on the end of the connecting shell near the drive shaft, which can improve the sealing performance between the centrifugal brake and the electromagnetic brake.

Description

Technical Field

[0001] This application relates to the technical field of motor structures, and in particular to a motor structure with a centrifugal brake and an electromagnetic brake. Background Technology

[0002] Electric cylinders convert the rotary motion of a motor into linear motion, and transform the precise speed control, rotational speed control, and torque control of the motor into precise speed control, precise position control, and precise thrust control; thus achieving a new series of high-precision linear motion products.

[0003] The motor includes a drive shaft, on the outer wall of which are mounted an electromagnetic brake and a centrifugal brake. When the friction disc of the electromagnetic brake is released, the rotor of the centrifugal brake, under the action of centrifugal force, limits the rotational speed of the drive shaft to a predetermined speed range, thus playing a safety role.

[0004] Currently, an outer shell is often added to the outside of the motor's rear cover, forming an installation space between the outer shell and the rear cover. The drive shaft extends into the installation space, and the centrifugal brake and electromagnetic brake are respectively installed on the outer wall of the drive shaft. The centrifugal brake and electromagnetic brake are located within the installation space. The main principle of the centrifugal brake is that a spring pulls a centrifugal block with friction. When the centrifugal force of the falling rotation exceeds the spring tension, the centrifugal block will be thrown out and rub against the inner wall of the outer shell. At this time, kinetic energy is converted into internal energy, producing a deceleration effect. When the centrifugal block rubs against the inner wall of the outer shell, it is easy to generate powder. Since the sealing between the centrifugal brake and the electromagnetic brake is weak, when the powder enters the interior of the electromagnetic brake, it will affect the use of the electromagnetic brake. Summary of the Invention

[0005] To improve the sealing between the centrifugal brake and the electromagnetic brake, this application provides a motor structure with both a centrifugal brake and an electromagnetic brake.

[0006] This application provides a motor structure with a centrifugal brake and an electromagnetic brake, which adopts the following technical solution:

[0007] A motor structure with a centrifugal brake and an electromagnetic brake includes a motor body, a rear cover, and a drive shaft. The rear cover seals the rear side of the motor body, and the drive shaft passes through the center of the motor body. A mounting shell is installed on the outer side of the rear cover, and a connecting shell is provided on the side of the mounting shell away from the rear cover. An installation cavity is formed between the mounting shell and the connecting shell. One end of the drive shaft moves through the side wall of the mounting shell and the side wall of the connecting shell, respectively. A centrifugal brake is installed on the outer wall of the drive shaft and is located in the installation cavity. An electromagnetic brake is installed on the end of the connecting shell away from the mounting shell. A first oil seal is installed on the end of the mounting shell near the drive shaft, and a second oil seal is installed on the end of the connecting shell near the drive shaft.

[0008] By adopting the above technical solution, physical isolation can be achieved under the action of the first oil seal and the second oil seal. When the drive shaft is stationary, the oil seal achieves static sealing through the tight fit between the outer edge and the cavity, preventing lubricating oil leakage. When the drive shaft starts to rotate, a dynamic lubricating medium film will be formed between the sealing lip and the surface of the drive shaft. This film can not only effectively prevent lubricating oil leakage, but also reduce friction and extend the service life of the oil seal. The first oil seal reduces the intrusion of dust generated by the centrifugal brake into the bearing, thereby reducing the wear or jamming of the bearing. The second oil seal can improve the sealing between the centrifugal brake and the electromagnetic brake, reduce the entry of dust generated by the centrifugal brake into the electromagnetic brake, and thus reduce the impact of dust on the use of the electromagnetic brake.

[0009] Preferably, a sealing groove is provided on the side of the rear cover near the mounting shell, and a first sealing ring is installed inside the rear cover. The first sealing ring is located in the sealing groove, and one side of the first sealing ring abuts against the side wall of the mounting shell.

[0010] By adopting the above technical solution, the sealing performance between the rear cover and the mounting shell can be improved under the action of the first sealing ring, reducing the possibility of external impurities or water entering the interior through the gap between the mounting shell and the rear cover.

[0011] Preferably, an abutment plate is fixed on the side of the mounting shell near the rear cover shell, and the outer wall of the abutment plate abuts against the inner ring of the rear cover shell.

[0012] By adopting the above technical solution, the outer wall of the abutment plate abuts against the inner ring of the rear cover. Under the action of the abutment plate, the contact area between the abutment plate and the rear cover can be increased, thereby further improving the connection stability between the mounting shell and the rear cover.

[0013] Preferably, the connecting shell has a mounting groove on the side near the mounting shell, the mounting groove is arranged around the circumference of the connecting shell, and a second sealing ring is installed inside the connecting shell. The second sealing ring is located in the mounting groove, and one side of the second sealing ring abuts against one side of the mounting shell.

[0014] By adopting the above technical solution, the sealing performance between the mounting shell and the connecting shell can be improved under the action of the second sealing ring, reducing the possibility of external impurities or water entering the interior through the gap between the mounting shell and the connecting shell.

[0015] Preferably, a bearing is fitted on the outer wall of the drive shaft, and the outer wall of the bearing is installed on the inner wall of the rear cover, with the bearing located on the inner side of the rear cover.

[0016] By adopting the above technical solution, under the action of the bearing, sliding friction is converted into rolling friction. By separating the contact surfaces between the rear cover and the drive shaft during the rolling process, the bearing significantly reduces friction and wear. Rolling friction is less than sliding friction, thereby improving mechanical efficiency.

[0017] Preferably, a receiving cavity is formed between the side wall of the mounting housing and the rear cover housing, and an encoder is installed on the side of the rear cover housing near the mounting housing, with the encoder located inside the receiving cavity.

[0018] By adopting the above technical solution, the encoder is located in the receiving cavity, and the first oil seal improves the sealing between the mounting shell and the rear cover shell, thereby reducing the amount of powder generated by the centrifugal brake entering the receiving cavity and thus reducing the impact on the use of the encoder.

[0019] Preferably, the electromagnetic brake housing has an assembly groove on the side near the connecting shell, the assembly groove is arranged around the circumference of the electromagnetic brake housing, and a third sealing ring is installed on the side wall of the electromagnetic brake housing. The third sealing ring is located in the assembly groove, and one side of the third sealing ring abuts against one side of the connecting shell.

[0020] By adopting the above technical solution, the sealing performance between the electromagnetic brake housing and the connecting shell can be improved under the action of the third sealing ring, reducing the possibility of external impurities or water entering the interior through the gap between the electromagnetic brake housing and the connecting shell.

[0021] Preferably, the mounting shell and the rear cover shell are detachably connected, and the mounting shell and the connecting shell are detachably connected.

[0022] By adopting the above technical solution, the mounting shell and the rear cover shell are detachably connected, and the mounting shell and the connecting shell are detachably connected, which can improve the ease of disassembly and assembly between the mounting shell and the rear cover shell, and between the mounting shell and the connecting shell, thus facilitating the subsequent maintenance of the centrifugal brake and the electromagnetic brake.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Physical isolation can be achieved through the action of the first and second oil seals. When the drive shaft is stationary, the oil seal achieves static sealing through the tight fit between the outer edge and the cavity, preventing lubricating oil leakage. When the drive shaft starts to rotate, a dynamic lubricating medium film is formed between the sealing lip and the surface of the drive shaft. This film can not only effectively prevent lubricating oil leakage, but also reduce friction and extend the service life of the oil seal. The first oil seal reduces the intrusion of dust generated by the centrifugal brake into the bearing, thereby reducing bearing wear or seizure. The second oil seal can improve the sealing between the centrifugal brake and the electromagnetic brake, reducing the entry of dust generated by the centrifugal brake into the electromagnetic brake, thereby reducing the impact of dust on the use of the electromagnetic brake.

[0025] 2. Under the action of the first sealing ring, the sealing performance between the rear cover and the mounting shell can be improved, reducing the possibility of external impurities or water entering the interior through the gap between the mounting shell and the rear cover. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0027] Figure 2 This is a partial cross-sectional view of an embodiment of this application.

[0028] Figure 3 yes Figure 2 A magnified view of A in the middle.

[0029] Explanation of reference numerals in the attached drawings: 11. Motor body; 12. Rear cover; 13. Drive shaft; 14. Bearing; 15. Encoder; 2. Mounting housing; 21. Abutment plate; 31. First sealing ring; 32. Second sealing ring; 33. Third sealing ring; 4. Connecting housing; 5. Centrifugal brake; 61. First oil seal; 62. Second oil seal; 7. Electromagnetic brake. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a motor structure with a centrifugal brake and an electromagnetic brake.

[0032] Reference Figure 1 and Figure 2 A motor structure with a centrifugal brake and an electromagnetic brake includes a motor, which includes a motor body 11, a rear cover 12 and a drive shaft 13. The rear cover 12 is fixed to one side of the motor body 11 by bolts and seals the rear side of the motor body 11. The drive shaft 13 passes through the center of the motor body 11. A bearing 14 is sleeved on the outer wall of the drive shaft 13. The outer wall of the bearing 14 is installed on the inner wall of the rear cover 12. The bearing 14 is located on the inner side of the rear cover 12. One end of the drive shaft 13 extends out of the side wall of the rear cover 12.

[0033] A mounting shell 2 is provided on the outer side of the rear cover 12. The side wall of the mounting shell 2 abuts against the side wall of the rear cover 12. The outer side of the mounting shell 2 and the outer side of the rear cover 12 are fixed by bolts. A sealing groove is provided on the side of the rear cover 12 near the mounting shell 2. The sealing groove is arranged around the circumference of the rear cover 12. A first sealing ring 31 is installed inside the rear cover 12. The first sealing ring 31 is located in the sealing groove. One side of the first sealing ring 31 abuts against the side wall of the mounting shell 2. Under the action of the first sealing ring 31, the sealing performance between the rear cover 12 and the mounting shell 2 can be improved, reducing the possibility of external impurities or water entering the interior through the gap between the mounting shell 2 and the rear cover 12.

[0034] Reference Figure 1 and Figure 2An abutment plate 21 is fixed on the side of the mounting shell 2 near the rear cover shell 12. The abutment plate 21 is arranged around the circumference of the mounting shell 2. The outer wall of the abutment plate 21 abuts against the inner ring of the rear cover shell 12. Under the action of the abutment plate 21, the contact area between the mounting shell 2 and the rear cover shell 12 can be increased, thereby further improving the connection stability between the mounting shell 2 and the rear cover shell 12.

[0035] A connecting shell 4 is provided on the side of the mounting shell 2 away from the rear cover shell 12. The outer side of the mounting shell 2 and the outer side of the connecting shell 4 are fixed together by bolts. One side of the mounting shell 2 is adapted to be inserted into one side of the connecting shell 4, and one side of the mounting shell 2 abuts against one side of the connecting shell 4. The inner ring of the mounting shell 2 abuts against the outer wall of the connecting shell 4. Correspondingly, a mounting groove is provided on the side of the connecting shell 4 near the mounting shell 2. The mounting groove is arranged around the circumference of the connecting shell 4. A second sealing ring 32 is installed inside the connecting shell 4. The second sealing ring 32 is located in the mounting groove. One side of the second sealing ring 32 abuts against one side of the mounting shell 2. Under the action of the second sealing ring 32, the sealing performance between the mounting shell 2 and the connecting shell 4 can be improved, reducing the possibility of external impurities or water entering the interior through the gap between the mounting shell 2 and the connecting shell 4.

[0036] Reference Figure 2 and Figure 3 An installation cavity is formed between the mounting shell 2 and the connecting shell 4. One end of the drive shaft 13 moves through the side wall of the mounting shell 2 and the side wall of the connecting shell 4 respectively. A centrifugal brake 5 is installed on the outer wall of the drive shaft 13 and is located in the installation cavity. A stabilizing groove is provided on the side wall of the mounting shell 2 near the drive shaft 13. The stabilizing groove is arranged around the circumference of the mounting shell 2 and is located on the side of the mounting groove near the rear cover shell 12. A first oil seal 61 is installed on the side of the mounting shell 2 near the rear cover shell 12 and is located in the stabilizing groove. Correspondingly, a connecting groove is provided on the side of the connecting shell 4 near the drive shaft 13 and is located on the side of the connecting shell 4 near the centrifugal brake 5. The connecting groove is arranged around the circumference of the connecting shell 4. A second oil seal 62 is installed on the side of the connecting shell 4 near the centrifugal brake 5 and is located in the connecting groove. An electromagnetic brake 7 is installed on the end of the connecting shell 4 away from the mounting shell 2.

[0037] An assembly groove is provided on the side of the electromagnetic brake 7 housing near the connecting shell 4. The assembly groove is arranged around the circumference of the electromagnetic brake 7 housing. A third sealing ring 33 is installed on the side wall of the electromagnetic brake 7 housing. The third sealing ring 33 is located in the assembly groove. One side of the third sealing ring 33 abuts against one side of the connecting shell 4. Under the action of the third sealing ring 33, the sealing performance between the electromagnetic brake 7 housing and the connecting shell 4 can be improved, reducing the possibility of external impurities or water entering the interior through the gap between the electromagnetic brake 7 housing and the connecting shell 4.

[0038] Under the action of the first oil seal 61 and the second oil seal 62, physical isolation can be achieved. When the drive shaft 13 is stationary, the oil seal achieves static sealing through the tight fit between the outer edge and the cavity, preventing lubricating oil leakage. When the drive shaft 13 starts to rotate, a dynamic lubricating medium film will be formed between the sealing lip and the surface of the drive shaft 13. This film can not only effectively prevent lubricating oil leakage, but also reduce friction and extend the service life of the oil seal. The first oil seal 61 reduces the intrusion of dust generated by the centrifugal brake 5 into the bearing 14, thereby reducing the wear or jamming of the bearing 14. The second oil seal 62 can improve the sealing between the centrifugal brake 5 and the electromagnetic brake 7, reduce the entry of dust generated by the centrifugal brake 5 into the electromagnetic brake 7, thereby reducing the impact of dust on the use of the electromagnetic brake 7.

[0039] Reference Figure 2 A receiving cavity is formed between the side wall of the mounting housing 2 and the rear cover housing 12. An encoder 15 is installed on the side of the rear cover housing 12 near the mounting housing 2. The encoder 15 is located in the receiving cavity. The first oil seal 61 improves the sealing between the mounting housing 2 and the rear cover housing 12, thereby reducing the amount of powder generated by the centrifugal brake 5 entering the receiving cavity, and thus reducing the impact on the use of the encoder 15.

[0040] The above are all preferred embodiments of this application. These embodiments are merely explanations of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor structure with a centrifugal brake and an electromagnetic brake, characterized in that, The device includes a motor body (11), a rear cover (12), and a drive shaft (13). The rear cover (12) seals the rear side of the motor body (11). The drive shaft (13) passes through the center of the motor body (11). A mounting shell (2) is installed on the outer side of the rear cover (12). A connecting shell (4) is provided on the side of the mounting shell (2) away from the rear cover (12). An installation cavity is formed between the mounting shell (2) and the connecting shell (4). One end of the drive shaft (13) moves through the side wall of the mounting shell (2) and the side wall of the connecting shell (4). A centrifugal brake (5) is installed on the outer wall of the drive shaft (13). The centrifugal brake (5) is located in the installation cavity. An electromagnetic brake (7) is installed on the end of the connecting shell (4) away from the mounting shell (2). A first oil seal (61) is installed on the end of the mounting shell (2) near the drive shaft (13). A second oil seal (62) is installed on the end of the connecting shell (4) near the drive shaft (13).

2. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, A sealing groove is provided on the side of the rear cover (12) near the mounting shell (2). A first sealing ring (31) is installed inside the rear cover (12). The first sealing ring (31) is located in the sealing groove, and one side of the first sealing ring (31) abuts against the side wall of the mounting shell (2).

3. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, The mounting shell (2) has an abutment plate (21) fixed on the side near the rear cover shell (12), and the outer wall of the abutment plate (21) abuts against the inner ring of the rear cover shell (12).

4. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, The connecting shell (4) has an installation groove on the side near the mounting shell (2). The installation groove is arranged around the connecting shell (4). A second sealing ring (32) is installed inside the connecting shell (4). The second sealing ring (32) is located in the installation groove, and one side of the second sealing ring (32) abuts against one side of the mounting shell (2).

5. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, The outer wall of the drive shaft (13) is fitted with a bearing (14), the outer wall of the bearing (14) is installed on the inner wall of the rear cover (12), and the bearing (14) is located on the inner side of the rear cover (12).

6. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, A receiving cavity is formed between the side wall of the mounting housing (2) and the rear cover housing (12). An encoder (15) is installed on the side of the rear cover housing (12) near the mounting housing (2). The encoder (15) is located in the receiving cavity.

7. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, An assembly groove is provided on the side of the electromagnetic brake (7) housing near the connecting shell (4). The assembly groove is arranged around the electromagnetic brake (7) housing. A third sealing ring (33) is installed on the side wall of the electromagnetic brake (7) housing. The third sealing ring (33) is located in the assembly groove. One side of the third sealing ring (33) abuts against one side of the connecting shell (4).

8. The motor structure with centrifugal brake and electromagnetic brake according to claim 1, characterized in that, The mounting shell (2) and the rear cover shell (12) are detachably connected, and the mounting shell (2) and the connecting shell (4) are detachably connected.

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