Planetary gear reduction motor

Abstract

The utility model provides a kind of planetary gear reduction motor, including motor, still including the reduction component being connected with motor;Motor shaft of motor is processed with sun gear, planetary carrier is rotatably connected with planetary gear, and planetary gear is engagedly connected with sun gear and gear ring;First ladder is provided on the outer wall of planetary carrier, first bearing is installed at first ladder, first recess is opened in the inner wall of output flange cover, the inner wall of gear ring is provided with second recess, after output flange cover is connected with gear ring, first bearing is located in first installation groove.The utility model in the present application cancels the radial force received by planetary gear by first bearing, effectively avoids that planetary gear bears additional radial load.Through the radial force risk of offsetting planetary gear, the vibration and noise caused by uneven stress can be greatly reduced, the overall reliability of the system is effectively improved, and the failure probability caused by component wear is reduced.

Description

Technical Field

[0001] This utility model relates to the field of planetary geared motor technology, and in particular to a planetary geared motor. Background Technology

[0002] Planetary geared motors are a widely used industrial product that can reduce motor speed while increasing output torque. Especially in the field of microelectromechanical systems, miniature planetary geared motors, with their compact structure and high transmission precision, have become key components in precision instruments, medical devices, small robots, and other equipment.

[0003] Chinese patent application CN202010138531.2 discloses a fully sealed lubricated planetary geared motor, comprising a motor, a housing, various gears, multiple sealing rings, and an output shaft. One side of the motor's output end is connected to a motor mounting plate via motor screws. The motor mounting plate is connected to one side of the housing via housing screws. A first-stage planetary gear is connected to the outer side of the motor gears. A planetary carrier gear is located on one side of the first-stage planetary gear. An internal helical gear is located on the outer side of the first-stage planetary gear. The gear on the inner side of the internal helical gear is connected to a second-stage planetary gear. The output end of the output shaft extends through the housing. In the aforementioned patent, the output shaft is mounted inside the housing via two bearings to ensure high-precision rotational movement of the output shaft under bearing support.

[0004] However, the aforementioned patent still has problems. The two bearings do not contact the gear ring, so when the output shaft is subjected to radial force, the planetary gears need to bear the radial force. For micro geared motors with compact size and extremely high precision requirements, this will not only accelerate the wear of the planetary gears and reduce transmission efficiency, but may also affect the overall operational stability and service life, making it difficult to meet the stringent requirements of precision equipment for micro transmission components. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a planetary gear reducer motor that can counteract the radial force borne by the planetary gears.

[0006] This utility model is implemented as follows:

[0007] In the first aspect, this utility model provides a planetary gear reducer motor, which includes a motor and a reduction gear component connected to the motor;

[0008] The reduction gear includes a planetary carrier, an output shaft, an output flange cover, a gear ring, and a locking screw. The output flange cover is connected to the gear ring, and the locking screw passes through the output flange cover and the gear ring to connect to the motor.

[0009] The planetary carrier and the output shaft are integrally formed. The planetary carrier is located inside the output flange cover. One end of the output shaft extends to the outside of the output flange cover. The motor shaft of the motor is machined with a sun gear. The planetary carrier is rotatably connected to several planet gears. The planet gears are meshed with the sun gear and the ring gear.

[0010] The outer wall of the planetary carrier is provided with a first step, and a first bearing is installed at the first step. The inner wall of the output flange cover is provided with a first groove, and the inner wall of the gear ring is provided with a second groove. After the output flange cover is connected to the gear ring, the first groove and the second groove form a first mounting groove that matches the first bearing. The outer ring of the first bearing is located in the first mounting groove.

[0011] Furthermore, the planetary carrier and the output shaft have a second step at their junction, a second bearing is installed at the second step, and a second mounting groove is provided on the inner wall of the output flange cover, with the outer ring of the second bearing located in the second mounting groove.

[0012] Furthermore, the motor shaft is mounted on the motor housing via a third bearing, and the area enclosed by the gear ring, the first bearing, and the third bearing is filled with lubricating grease. Both the third bearing and the first bearing are double-sealed bearings.

[0013] Furthermore, a number of locating pins are installed on the side of the output flange cover facing the gear ring, and the locating pins are connected to the gear ring.

[0014] Furthermore, a baffle is provided between the gear ring and the motor housing.

[0015] The advantages of this utility model are:

[0016] 1. In this application, a first groove and a second groove are respectively formed on the inner walls of the output flange cover and the gear ring. The first bearing is installed in the first mounting groove formed by the first groove and the second groove, thereby forming a stable radial force bearing path. Compared with the disadvantage of the planetary gear having to bear the radial force in the prior art, this structure can directly offset the radial force on the planetary gear by the outer ring of the first bearing, effectively avoiding the planetary gear bearing additional radial load. By offsetting the risk of radial force on the planetary gear, vibration and noise caused by uneven force can be greatly reduced, effectively improving the overall reliability of the system and reducing the probability of failure caused by component wear.

[0017] 2. This utility model, through the integrated design of the planetary carrier and output shaft, combined with the ingenious installation layout of the bearing, gear ring, and output flange cover, achieves efficient radial force bearing without significantly increasing the motor size, fully meeting the requirements of micro-electromechanical systems for a compact structure. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of a specific embodiment of a planetary gear reducer motor according to the present invention.

[0020] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle.

[0021] Figure 3 This is a schematic diagram of the connection structure between the planetary carrier and the output shaft in this utility model.

[0022] Figure 4 This is a schematic diagram of the output flange cover structure in this utility model.

[0023] Explanation of the labels in the diagram:

[0024] 1. Motor; 2. Planetary carrier; 21. First step; 3. Output shaft; 4. Output flange cover; 41. First groove; 42. Second mounting groove; 5. Gear ring; 51. Second groove; 6. Locking screw; 7. Planetary gear; 8. First bearing; 9. Second step; 10. Second bearing; 11. Motor shaft; 12. Third bearing; 13. Locating pin; 14. Baffle. Detailed Implementation

[0025] Please see Figures 1 to 4 This utility model provides a planetary gear reducer motor, including a motor 1, which is a permanent magnet brushless motor 1, and also includes a reduction component connected to the motor 1;

[0026] The reduction gear includes a planetary carrier 2, an output shaft 3, an output flange cover 4, a gear ring 5, and a locking screw 6. The output flange cover 4 is connected to the gear ring 5, and the locking screw 6 passes through the output flange cover 4 and the gear ring 5 and is connected to the motor 1.

[0027] The gear ring 5 has 105 teeth, the sun gear has 15 teeth, the module is 0.4, and the single-group transmission ratio is 8. This configuration satisfies the rated output torque and maximizes the input torque brought by the permanent magnet motor 1.

[0028] The planetary carrier 2 and the output shaft 3 are integrally formed. The planetary carrier 2 is located inside the output flange cover 4. One end of the output shaft 3 extends to the outside of the output flange cover 4. The motor shaft 11 of the motor 1 is machined with a sun gear. The permanent magnet brushless motor shaft 11 directly uses gear hobbing instead of a sun gear, so that there is no need to install another sun gear on the motor shaft 11, which greatly reduces the transmission space. The planetary carrier 2 is rotatably connected to several planet gears 7. The planet gears 7 are meshed with the sun gear and the gear ring 5.

[0029] The planetary carrier 2 has a first step 21 on its outer wall, and a first bearing 8 is installed at the first step 21. The output flange cover 4 has a first groove 41 on its inner wall, and the gear ring 5 has a second groove 51 on its inner wall. After the output flange cover 4 is connected to the gear ring 5, the first groove 41 and the second groove 51 form a first mounting groove that matches the first bearing 8. The outer ring of the first bearing 8 is located within the first mounting groove, and the two end faces of the first bearing 8 abut against the side walls of the first groove 41 and the second groove 51, respectively. By having the first bearing 8 directly and tightly adhere to the gear ring 5, all radial forces borne by the planetary gears 7 are offset, while minimizing space and making the structure more compact. The first bearing 8 is designated as 61807-2RS.

[0030] For the tooth profiles of the gear ring 5, the sun gear, and the sun gear machined on the motor shaft 11, modified involute or cycloidal tooth profiles are adopted, which can effectively reduce the impact and sliding friction during gear meshing and improve transmission efficiency. At the same time, the materials of the gears, sun gear, and motor shaft 11 can be optimized by using high-strength, low-friction alloy steel and heat-treating it to improve the hardness and wear resistance of the gears, and reduce wear and noise.

[0031] Specifically, the planetary carrier 2 and the output shaft 3 have a second step 9 at their junction, and a second bearing 10 is installed at the second step 9. A second mounting groove 42 is provided on the inner wall of the output flange cover 4, and the outer ring of the second bearing 10 is located within the second mounting groove 42. The second bearing 10 is the same as the first bearing 8 and the third bearing 12, all being double-sealed bearings. The second bearing 10 is a single-row deep groove ball bearing 16004-2RS.

[0032] Specifically, the motor shaft 11 is mounted on the housing of the motor 1 via a third bearing 12. The area enclosed by the gear ring 5, the first bearing 8, and the third bearing 12 is filled with lubricating grease. Both the third bearing 12 and the first bearing 8 are double-sealed bearings. The third bearing 12 is designated as 608-2SR.

[0033] The meshing between the gear ring 5, the sun gear, and the sun gear machined on the motor shaft 11 requires lubrication with grease. In existing technology, oil seals are typically used to prevent grease leakage, thus preventing grease from penetrating into the motor 1 or leaking to the outside of the reduction gear. However, using oil seals increases the damping of the reduction gear. Using two double-sealed bearings reduces the damping caused by the oil seals, significantly improving transmission efficiency.

[0034] Specifically, a number of positioning pins 13 are installed on the side of the output flange cover 4 facing the gear ring 5, and the positioning pins 13 are connected to the gear ring 5.

[0035] Specifically, a baffle 14 is also provided between the gear ring 5 and the housing of the motor 1. The size of the baffle 14 matches the inner diameter of the gear, and the baffle 14 is used to isolate the planetary gear 7 from the motor 1.

[0036] The advantages of this utility model are as follows: 1. In this application, a first groove 41 and a second groove 51 are respectively provided on the inner walls of the output flange cover 4 and the gear ring 5. The first bearing 8 is installed in the first mounting groove formed by the first groove 41 and the second groove 51, thereby forming a stable radial force bearing path. Compared with the disadvantage of the planetary gear 7 bearing the radial force in the prior art, this structure can directly offset the radial force on the planetary gear 7 by the outer ring of the first bearing 8, effectively avoiding the planetary gear 7 bearing additional radial load. By offsetting the radial force risk of the planetary gear 7, the vibration and noise caused by uneven force can be greatly reduced, effectively improving the overall reliability of the system and reducing the probability of failure caused by component wear. 2. This utility model, through the integrated design of the planetary carrier 2 and the output shaft 3, combined with the ingenious installation layout of the bearing, gear ring 5, and output flange cover 4, achieves efficient radial force bearing without significantly increasing the volume of the motor 1, fully meeting the requirements of micro-electromechanical systems for compact structure.

[0037] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A planetary gear reducer motor, comprising a motor, characterized in that: It also includes a speed reduction component connected to the motor; The reduction gear includes a planetary carrier, an output shaft, an output flange cover, a gear ring, and a locking screw. The output flange cover is connected to the gear ring, and the locking screw passes through the output flange cover and the gear ring to connect to the motor. The planetary carrier and the output shaft are integrally formed. The planetary carrier is located inside the output flange cover. One end of the output shaft extends to the outside of the output flange cover. The motor shaft of the motor is machined with a sun gear. The planetary carrier is rotatably connected to several planet gears. The planet gears are meshed with the sun gear and the ring gear. The outer wall of the planetary carrier is provided with a first step, and a first bearing is installed at the first step. The inner wall of the output flange cover is provided with a first groove, and the inner wall of the gear ring is provided with a second groove. After the output flange cover is connected to the gear ring, the first groove and the second groove form a first mounting groove that matches the first bearing. The outer ring of the first bearing is located in the first mounting groove.

2. The planetary gear reducer motor as described in claim 1, characterized in that: The planetary carrier and the output shaft have a second step at their junction, and a second bearing is installed at the second step. The inner wall of the output flange cover has a second mounting groove, and the outer ring of the second bearing is located in the second mounting groove.

3. A planetary gear reducer motor as described in claim 2, characterized in that: The motor shaft is mounted on the motor housing via a third bearing. The area enclosed by the gear ring, the first bearing, and the third bearing is filled with lubricating grease. Both the third bearing and the first bearing are double-sealed bearings.

4. A planetary gear reducer motor as described in claim 1, characterized in that: The output flange cover has several locating pins installed on the side facing the gear ring, and the locating pins are connected to the gear ring.

5. A planetary gear reducer motor as described in claim 1, characterized in that: A baffle is also provided between the gear ring and the motor housing.

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