Gear motor

Abstract

The invention relates to the technical field of transmission devices, and discloses a speed reduction motor which comprises a box body, a first-stage inner gear ring, a second-stage inner gear ring, a first-stage NGW planetary speed reduction mechanism and a second-stage small-tooth-difference planetary speed reduction mechanism are arranged in the box body, and the first-stage NGW planetary speed reduction mechanism comprises a first-stage sun gear, a first-stage planet gear, a first-stage planet carrier and a first-stage inner gear ring. The second-stage small-tooth-difference planetary reduction mechanism comprises a second-stage eccentric shaft, at least two second-stage outer gears, a second-stage pin shaft disc and a second-stage inner gear ring, each eccentric shaft section of the second-stage eccentric shaft is rotationally connected with one second-stage outer gear, one end of the box body is connected with a motor, and the other end of the box body is connected with an end cover in a plugging mode. An output shaft of the motor is in coaxial transmission connection with the first-stage sun gear, the first-stage planet carrier is connected with the second-stage eccentric shaft, and an output shaft section of the second-stage pin shaft disc penetrates through the end cover and is partially exposed out of the end cover. The total reduction ratio can reach 600 or even higher, the bearing capacity is high, the structure is simple and compact, and the occupied space is small.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices, and more specifically to a reduction motor. Background Art

[0002] A reduction motor generally refers to an integrated body of a reducer and a motor. The reduction motor has the advantages of simplified design and space saving, so it is widely used in the steel industry and the machinery industry. However, in high temperature and strong radiation conditions, the service life of the existing reduction motor will be greatly shortened, especially the reducer part, so it needs to be frequently repaired or replaced, which is very inconvenient under such conditions. Therefore, a reduction motor that can withstand high temperatures and radiation is needed. In addition, the reduction ratios of existing reduction motors are very small and cannot meet the requirements of use. In some scenarios, the reduction motor is not only required to be resistant to high temperatures and radiation, but also required to have a large speed ratio and compact structure. Summary of the invention

[0003] The present invention provides a reduction motor to overcome the above-mentioned deficiencies in the prior art. The present invention achieves the above-mentioned purpose through the following technical solutions.

[0004] A reduction motor comprises a cylindrical housing with two ends open, a primary inner gear ring and a secondary inner gear ring coaxially fixedly arranged in the housing, a primary NGW planetary reduction mechanism and a secondary small-tooth-difference planetary reduction mechanism arranged in the housing, wherein the primary NGW planetary reduction mechanism comprises a primary sun gear, a primary planetary gear, a primary planetary carrier and the primary inner gear ring, the secondary small-tooth-difference planetary reduction mechanism comprises a secondary eccentric shaft, at least two secondary external gears, a secondary pin shaft plate and the secondary inner gear ring, each eccentric shaft section of the secondary eccentric shaft is rotatably connected to a secondary external gear, and the structural form of the primary NGW planetary reduction mechanism is that the primary inner gear ring is fixed, the primary sun gear is input, and the primary planetary gear is rotated. The structure of the secondary small-tooth-difference planetary reduction mechanism is that the secondary internal gear ring is fixed, the secondary eccentric shaft is input, and the secondary pin shaft disk is output, and all the secondary external gears jointly drive the secondary pin shaft disk to rotate, and the primary internal gear ring, the primary sun gear, the primary planetary gear, the secondary internal gear ring and the secondary external gear are all made of stainless steel; one end of the box body is connected to a motor, and the motor blocks the open end of the box body, and the other end of the box body is connected and blocked with an end cover, the output shaft of the motor is coaxially connected to the primary sun gear, the primary planetary carrier is connected to the secondary eccentric shaft, and the axis of the primary planetary carrier is coaxial with the rotation axis of the secondary eccentric shaft, and the output shaft section of the secondary pin shaft disk passes through the end cover and is partially exposed on the end cover.

[0005] The two-stage small-tooth-difference planetary reduction mechanism in this scheme adopts at least two two-stage external gears arranged in parallel, and the number of eccentric shaft sections on the two-stage eccentric shaft is the same as the number of two-stage external gears, so that this scheme can ensure that the scheme has sufficient load-bearing capacity. The number of two-stage external gears should not be too many, usually two to four. The one-stage inner ring, the one-stage sun gear, the one-stage planetary gear, the two-stage inner ring and the two-stage external gear in this scheme are all made of stainless steel, so that the reduction mechanism part of the reduction motor has the advantages of high temperature resistance and radiation resistance. Combined with the high temperature resistance and radiation resistance motor, the reduction motor can run well for a long time under high temperature and strong radiation conditions, greatly reducing the number of repairs and replacements, reducing maintenance costs, and the use of stainless steel for the above parts can greatly improve the load capacity of the reduction motor. The reduction mechanism in the reduction motor of this scheme is composed of a common planetary gear train and a planetary gear train with a small tooth difference. The common planetary gear train realizes a primary speed reduction, and the planetary gear train with a small tooth difference realizes a secondary speed reduction, so that the total reduction ratio can reach 600 or even higher. In addition, this scheme is coaxial input and output, with a simple and compact structure, small space occupation, and convenient design and selection.

[0006] As a further improved structural form, each of the above-mentioned secondary external gears is evenly provided with at least five through holes for driving around its axis, and the through holes on adjacent secondary external gears correspond eccentrically one by one. The secondary pin shaft disk includes an output disk shaft, a free disk shaft, a round shaft pin and a sleeve. The output disk shaft and the free disk shaft are coaxially connected by a plurality of round shaft pins. The number of round shaft pins is the same as the number of through holes on each secondary external gear. All round shaft pins are evenly arranged around the axis of the output disk shaft. A plurality of sleeves are sleeved on the outside of each round shaft pin. The number of sleeves on the outside of each round shaft pin is the same as the number of secondary external gears. Each round shaft pin and the sleeve thereon pass through the eccentrically corresponding through holes on the secondary external gear one by one. The sleeve on the outside of each round shaft pin is respectively opposite to the secondary external gear. The number of through holes on the secondary external gear should not be too many, and is determined according to the diameter of the secondary external gear, and is usually five to ten. The sleeve can rotate relative to the round shaft pin. The sleeve is preferably made of wear-resistant material, and a sleeve on the outside of each round shaft pin corresponds to a secondary external gear, which can greatly reduce friction loss and also reduce the noise of the reduction motor.

[0007] As a further improved structural form, the primary inner gear ring, the secondary inner gear ring and the housing are integrated. This structural form makes the structure of the reduction motor more compact, and the integrated housing can ensure better sealing while ensuring strength.

[0008] As a further improved structural form, the end of the output shaft of the above-mentioned motor is provided with an internal spline blind hole, and a first wear-resistant block is embedded at the bottom of the internal spline blind hole of the output shaft of the motor. One end of the first-stage sun gear that is connected to the motor transmission is the connecting end of the first-stage sun gear, and the other end of the first-stage sun gear is the free end of the first-stage sun gear. The connecting end of the first-stage sun gear is provided with a coaxial external spline, and the external spline of the first-stage sun gear cooperates with the internal spline blind hole spline of the output shaft of the motor. The connecting end of the first-stage sun gear is coaxially provided with a ball top for abutting the first wear-resistant block, and the free end of the first-stage sun gear is coaxially provided with a ball top for abutting The first planet carrier has a spherical top on the inner wall, and the end of the first planet carrier away from the motor is the output end of the first planet carrier. The output end of the first planet carrier is provided with a coaxial internal spline blind hole. The bottom of the internal spline blind hole of the first planet carrier is embedded with a second wear-resistant block. The end of the second eccentric shaft close to the motor is the connecting end of the second eccentric shaft. The connecting end of the second eccentric shaft is provided with an external spline coaxial with the rotation axis of the second eccentric shaft. The external spline of the second eccentric shaft cooperates with the internal spline blind hole spline of the first planet carrier. The connecting end of the second eccentric shaft is provided with a spherical top coaxial with the rotation axis of the second eccentric shaft and used to abut the second wear-resistant block. In this structural form, the output shaft of the motor and the first sun gear, as well as the first planet carrier and the second eccentric shaft are connected by spline matching transmission, which has a simple structure, convenient assembly, more firm connection, and more reliable transmission. In this structural form, the first sun gear, the first planet carrier and the second eccentric shaft all have a certain degree of floating, especially the first sun gear and the first planet carrier have a larger floating. If there is a plane end contact between the primary sun gear and the output shaft of the motor and the primary planet carrier, and / or there is a plane end contact between the secondary eccentric shaft and the primary planet carrier, a large friction will be generated at the contact plane, which will cause the output shaft of the motor, the primary sun gear, the primary planet carrier and the secondary eccentric shaft to wear faster on the one hand, and on the other hand, it will cause the reduction motor to make a large noise. This structural form provides wear-resistant blocks and ball tops, and these frictions occur between the wear-resistant blocks and the ball tops. On the one hand, it can reduce the wear rate of the aforementioned corresponding parts and play a protective role, and on the other hand, it can effectively reduce the noise of the reduction motor.

[0009] Compared with the prior art, the present invention mainly has the following beneficial effects: the two-stage small-tooth-difference planetary reduction mechanism adopts at least two two-stage external gears arranged in parallel, which ensures that the present invention has sufficient load-bearing capacity. The first-stage inner gear ring, the first-stage sun gear, the first-stage planetary gear, the second-stage inner gear ring and the second-stage external gear are all made of stainless steel, which can ensure that the reduction mechanism part of the reduction motor has the advantages of high temperature resistance and radiation resistance. With the motor that is resistant to high temperature and radiation, the reduction motor can run well and for a long time under high temperature and strong radiation conditions, greatly reducing the number of repairs and replacements, and reducing maintenance costs. Moreover, the use of stainless steel for the above parts can greatly improve the load capacity of the reduction motor. The reduction mechanism in the reduction motor is composed of a common planetary gear train and a planetary gear train with a small tooth difference. The common planetary gear train realizes a primary speed reduction, and the planetary gear train with a small tooth difference realizes a secondary speed reduction, so that the total reduction ratio can reach 600 or even higher. The present invention is coaxial input and output, simple and compact in structure, small in space, easy to design and select, easy to process and assemble, firmly connected, reliable in transmission, and low in noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present invention.

[0011] Figure 2 for Figure 1 A partial enlarged view of point M in the middle.

[0012] Figure 3 for Figure 1 A local enlarged view of point N in the middle.

[0013] Figure 4 It is a schematic diagram of the cross-sectional structure of the box body in the embodiment of the present invention.

[0014] Figure 5 It is a schematic diagram of the three-dimensional structure of the secondary pin disk in an embodiment of the present invention. Implementation

[0015] The present invention is further described below in conjunction with the accompanying drawings. The accompanying drawings are only used for exemplary description and cannot be understood as limiting the present invention. In order to more concisely describe the present embodiment, some parts that are well known to those skilled in the art but not related to the main content of the present invention will be omitted in the accompanying drawings or descriptions. In addition, for the convenience of description, some parts in the accompanying drawings will be omitted, enlarged or reduced, but they do not represent the size or entire structure of the actual product.

[0016] Examples, such as Figure 1 and Figure 4As shown, a reduction motor includes a housing 1 with open ends and a cylindrical main structure, and a first-stage NGW planetary reduction mechanism and a second-stage small-tooth difference planetary reduction mechanism are arranged in the housing. A first-stage inner ring gear 11 and a second-stage inner ring gear 12 are coaxially arranged in the housing 1, and the first-stage inner ring gear 11, the second-stage inner ring gear 12 and the housing 1 are integrated. The first-stage NGW planetary reduction mechanism includes a first-stage sun gear 2, a first-stage planetary gear 3, a first-stage planetary carrier 4 and a first-stage inner ring gear 11. The second-stage small-tooth difference planetary reduction mechanism includes a second-stage eccentric shaft 5, two second-stage external gears 6, a second-stage pin shaft disc 7 and a second-stage inner ring gear 12. Among them, the housing 1, the first-stage sun gear 2, the first-stage planetary gear 3 and the second-stage external gear 6 are all made of stainless steel. A high-temperature and radiation-resistant motor 8 is connected to one end of the housing 1, and the motor 8 blocks the opening of the housing 1 at this end. An end cover 9 is connected to the other end of the housing 1, and the end cover 9 blocks the opening of the housing 1 at this end.

[0017] The structure of the first-stage NGW planetary reduction mechanism is that the first-stage inner gear ring is fixed, the first-stage sun gear is input, and the first-stage planet carrier is output. Specifically, the first-stage planetary gear 3 is rotatably connected to the first-stage planet carrier 4 through a bearing. In this embodiment, the first-stage planet carrier 4 is rotatably connected to three first-stage planetary gears 3, and the three first-stage planetary gears 3 are all meshed with the first-stage sun gear 2 externally, and the three first-stage planetary gears 3 are all meshed with the first-stage inner gear ring 11 internally. The first-stage sun gear 2 is coaxially connected to the output shaft of the motor 8.

[0018] The structural form of the two-stage small-tooth-difference planetary reduction mechanism is that the two-stage internal gear ring is fixed, the two-stage eccentric shaft is input, and the two-stage pin shaft disk is output. Specifically, two eccentric shaft sections are arranged on the secondary eccentric shaft 5, and the axes of the two eccentric shaft sections are evenly arranged around the rotation axis of the secondary eccentric shaft 5. Each eccentric shaft section is rotatably connected to a secondary external gear 6 through a bearing, and the two secondary external gears 6 are meshed with the secondary internal gear ring 12. In other embodiments, three or four eccentric shaft sections can also be evenly arranged on the secondary eccentric shaft around the rotation axis of the secondary eccentric shaft, and then three or four secondary external gears are connected accordingly. Each secondary external gear is generally evenly arranged with five to ten through holes for driving around its axis. In this embodiment, eight through holes are evenly arranged on each secondary external gear 6, and the through holes on the two secondary external gears 6 correspond eccentrically one by one.

[0019] like Figure 5 and Figure 1As shown, the secondary pin shaft disk 7 includes an output disk shaft 71, a free disk shaft 72, a round shaft pin 73 and a sleeve 74. The output disk shaft 71 and the free disk shaft 72 are connected by eight round shaft pins 73, and the eight round shaft pins 73 are evenly arranged around the axis of the output disk shaft 71. Two sleeves 74 are sleeved on the outside of each round shaft pin 73, and each round shaft pin 73 and the sleeve 74 thereon pass through the eccentrically corresponding through holes on the secondary external gear 6 together, and a sleeve 74 on the outside of each round shaft pin 73 is opposite to a secondary external gear 6. The sleeve 74 in this embodiment is made of wear-resistant material, and the sleeve 74 can rotate relative to the round shaft pin 73, which can greatly reduce the friction loss of the round shaft pin 73 and the secondary external gear 6, extend the service life of the round shaft pin 73 and the secondary external gear 6, help extend the service life of the reduction motor, and also reduce the noise of the reduction motor.

[0020] like Figure 5 , Figure 1 and Figure 4 As shown, the output disc shaft 71 includes a coaxial integrated output end connecting disc 711 and an output shaft segment 712, the output shaft segment 712 is rotatably connected to the end cover 9 through a bearing, and a portion of the output shaft segment 712 is exposed from the end cover 9 for connecting a load. The free disc shaft 72 includes a coaxial integrated free end connecting disc 721 and a support shaft segment 722, and a bearing seat wall 13 is integrally provided between the primary inner gear ring 11 and the secondary inner gear ring 12 in the housing 1, and the support shaft segment 722 is rotatably supported on the bearing seat wall 13 through a bearing.

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the end of the output shaft of the motor 8 is provided with an internal spline blind hole, and the first wear-resistant block 81 is embedded at the bottom of the internal spline blind hole of the output shaft of the motor 8. One end of the primary sun gear 2 that is transmission-connected to the motor 8 is the connecting end of the primary sun gear 2, and the other end of the primary sun gear 2 is the free end of the primary sun gear 2. The connecting end of the primary sun gear 2 is provided with a coaxial external spline, and the external spline of the primary sun gear 2 cooperates with the internal spline blind hole spline of the output shaft of the motor 8. The connecting end of the primary sun gear 2 is coaxially provided with a first ball top 21 for abutting the first wear-resistant block 81, and the free end of the primary sun gear 2 is coaxially provided with a second ball top 22 for abutting the inner wall of the primary planetary carrier 4.

[0022] The end of the primary planetary carrier 4 away from the motor 8 is the output end of the primary planetary carrier 4. The output end of the primary planetary carrier 4 is provided with a coaxial internal spline blind hole. The second wear-resistant block 41 is embedded at the bottom of the internal spline blind hole of the primary planetary carrier 4. The end of the secondary eccentric shaft 5 close to the motor 8 is the connecting end of the secondary eccentric shaft 5, and the end of the secondary eccentric shaft 5 away from the motor 8 is the free end of the secondary eccentric shaft 5. The connecting end of the secondary eccentric shaft 5 is provided with an external spline coaxial with the rotation axis of the secondary eccentric shaft 5. The secondary eccentric shaft 5 passes through the free disk shaft 72, and the external spline of the secondary eccentric shaft 5 cooperates with the internal spline blind hole spline of the primary planetary carrier 4. The connecting end of the secondary eccentric shaft 5 is provided with a third ball top 51 coaxial with the rotation axis of the secondary eccentric shaft 5 and used to abut the second wear-resistant block 41.

[0023] The transmission process of the reduction motor of this embodiment is that the output shaft of the motor 8 drives the primary sun gear 2 to rotate, the primary sun gear 2 drives the three primary planetary gears 3 to rotate and then drives the primary planetary carrier 4 to rotate, the primary planetary carrier 4 drives the secondary eccentric shaft 5 to rotate, the secondary eccentric shaft 5 drives the two secondary external gears 6 to rotate eccentrically, and then the two secondary external gears 6 jointly drive the secondary pin shaft disk 7 to rotate by pressing against the sleeve 74 and the round shaft pin 73.

[0024] The two-stage small-tooth-difference planetary reduction mechanism in this embodiment adopts two two-stage external gears 6 arranged in parallel to ensure that this embodiment has sufficient load-bearing capacity. The first-stage inner gear ring 11, the first-stage sun gear 2, the first-stage planetary gear 3, the second-stage inner gear ring 12 and the second-stage external gear 6 are all made of stainless steel, which can ensure that the reduction mechanism part of the reduction motor has the advantages of high temperature resistance and radiation resistance. With the high temperature resistance and radiation resistance motor 8, the reduction motor can run well and for a long time under high temperature and strong radiation conditions, greatly reducing the number of repairs and replacements, reducing maintenance costs, and the use of stainless steel for the above parts can greatly improve the load capacity of the reduction motor. The reduction mechanism in the reduction motor of this embodiment is composed of a common planetary gear train and a planetary gear train with a small tooth difference. The common planetary gear train realizes a primary speed reduction, and the planetary gear train with a small tooth difference realizes a secondary speed reduction, so that the total reduction ratio can reach 600 or even higher. This embodiment adopts an integrated housing 1 to make the structure of the reduction motor more compact, while ensuring strength and ensuring better sealing. In this embodiment, the output shaft of the motor 8 and the first-stage sun gear 2, as well as the first-stage planetary carrier 4 and the second-stage eccentric shaft 5 are connected by spline matching, which has a simple structure, convenient assembly, more firm connection, and more reliable transmission. In this embodiment, wear-resistant blocks and ball tops are set, so that the first-stage sun gear 2 and the output shaft of the motor 8 and the first-stage planetary carrier 4, as well as the second-stage eccentric shaft 5 and the first-stage planetary carrier 4 can contact each other through the wear-resistant blocks and the ball tops, so that friction occurs between the wear-resistant blocks and the ball tops, which can reduce the wear rate of the aforementioned corresponding parts on the one hand and play a protective role, and can effectively reduce the noise of the reduction motor on the other hand. In addition, this embodiment has coaxial input and output, simple and compact structure, small space occupation, easy design and selection, easy processing and assembly, firm connection, reliable transmission, and low noise.

[0025] The above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using the design concept of the present invention fall within the protection scope of the present invention.

Claims

1. A reduction motor, characterized in that: It comprises a cylindrical case with open ends, in which a coaxial primary inner gear ring and a secondary inner gear ring are fixedly arranged, and a primary NGW planetary reduction mechanism and a secondary small-tooth-difference planetary reduction mechanism are arranged in the case, wherein the primary NGW planetary reduction mechanism comprises a primary sun gear, a primary planetary gear, a primary planetary carrier and the primary inner gear ring, and the secondary small-tooth-difference planetary reduction mechanism comprises a secondary eccentric shaft, at least two secondary external gears, a secondary pin shaft plate and the secondary inner gear ring, and each eccentric shaft section of the secondary eccentric shaft is rotatably connected to a secondary external gear, and the structural form of the primary NGW planetary reduction mechanism is that the primary inner gear ring is fixed, the primary sun gear is input, and the primary planetary carrier is output, The structure of the two-stage small-tooth-difference planetary reduction mechanism is that the two-stage internal gear ring is fixed, the two-stage eccentric shaft is input, and the two-stage pin shaft disk is output, and all the two-stage external gears jointly drive the two-stage pin shaft disk to rotate, and the one-stage internal gear ring, the one-stage sun gear, the one-stage planetary gear, the two-stage internal gear ring and the two-stage external gear are all made of stainless steel; one end of the housing is connected to a motor, and the motor blocks the open end of the housing, and the other end of the housing is connected and blocked with an end cover, the output shaft of the motor is coaxially connected to the one-stage sun gear, the one-stage planetary carrier is connected to the two-stage eccentric shaft, and the axis of the one-stage planetary carrier is coaxial with the rotation axis of the two-stage eccentric shaft, and the output shaft section of the two-stage pin shaft disk passes through the end cover and is partially exposed on the end cover.

2. The reduction motor according to claim 1, characterized in that: Each of the secondary external gears is evenly provided with at least five through holes for driving around its axis, and the through holes on adjacent secondary external gears correspond eccentrically to each other. The secondary pin shaft disk includes an output disk shaft, a free disk shaft, a round shaft pin and a sleeve. The output disk shaft and the free disk shaft are coaxially connected by a plurality of round shaft pins. The number of the round shaft pins is the same as the number of the through holes on each secondary external gear. All the round shaft pins are evenly arranged around the axis of the output disk shaft. A plurality of sleeves are sleeved on the outside of each round shaft pin. The number of the sleeves on the outside of each round shaft pin is the same as the number of the secondary external gears. Each round shaft pin and the sleeve thereon pass through the eccentrically corresponding through holes on the secondary external gears together, and the sleeves on the outside of each round shaft pin are respectively opposite to the secondary external gears.

3. The reduction motor according to claim 1, characterized in that: The primary inner gear ring, the secondary inner gear ring and the housing are integrated.

4. The reduction motor according to claim 1, characterized in that: The end of the output shaft of the motor is provided with an internal spline blind hole, and a first wear-resistant block is embedded at the bottom of the internal spline blind hole of the output shaft of the motor. One end of the first-stage sun gear that is connected to the motor transmission is the connecting end of the first-stage sun gear, and the other end of the first-stage sun gear is the free end of the first-stage sun gear. The connecting end of the first-stage sun gear is provided with a coaxial external spline, and the external spline of the first-stage sun gear cooperates with the internal spline blind hole spline of the output shaft of the motor. The connecting end of the first-stage sun gear is coaxially provided with a ball top for abutting the first wear-resistant block, and the free end of the first-stage sun gear is coaxially provided with an inner wall of the first-stage planetary carrier. The first planetary carrier has a ball top, an end away from the motor on the first planetary carrier is the output end of the first planetary carrier, the output end of the first planetary carrier is provided with a coaxial internal spline blind hole, the bottom of the internal spline blind hole of the first planetary carrier is embedded with a second wear-resistant block, the end of the secondary eccentric shaft close to the motor is the connecting end of the secondary eccentric shaft, the connecting end of the secondary eccentric shaft is provided with an external spline coaxial with the rotation axis of the secondary eccentric shaft, the external spline of the secondary eccentric shaft cooperates with the internal spline blind hole spline of the first planetary carrier, and the connecting end of the secondary eccentric shaft is provided with a ball top coaxial with the rotation axis of the secondary eccentric shaft and used to abut the second wear-resistant block.

Images