RV speed reduction structure with high input precision

Abstract

The utility model provides an RV speed reduction structure with high input precision, which relates to the technical field of speed reduction devices and comprises a pin wheel housing, an output shaft, an output end cover, two cycloidal gears, at least two eccentric shafts arranged in a circumferential array, an input shaft and roller pins. The end, close to the output end cover, of the input shaft is provided with an input gear. The end of the eccentric shaft is provided with a planet gear meshed with the input gear. The end, away from the input gear, of the input shaft is connected with a connecting shaft coaxially arranged with the input shaft, and the motor is installed on the connecting shaft through screws. Supporting bearings are arranged between the outer wall of the input shaft and an inner hole of the output shaft and an inner hole of the output end cover respectively, or two supporting bearings are arranged between the outer wall of the input shaft and the inner hole of the output end cover, and a first deviation rectifying structure or a second deviation rectifying structure is arranged between the connecting shaft and the input shaft. According to the utility model, the stability and coaxiality of installation and connection of the input shaft and the motor can be improved, rapid installation of the input shaft and the motor is facilitated, the positioning precision and the input precision are improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of speed reduction device technology, and in particular to an RV speed reduction structure with high input accuracy. Background Technology

[0002] In existing RV reducers, the input shaft is directly connected to the motor. When the motor is large and heavy, and the input shaft is long, the end of the input shaft furthest from the motor may tilt upwards. This makes it difficult to align the input gear with the planetary gears, hindering installation and potentially damaging the input gear teeth. Furthermore, runout occurs during the connection between the input shaft and the motor, resulting in coaxiality and perpendicularity errors between the motor and the reducer body, between the input shaft and the motor, and between the reducer body and the RV reducer. These accumulated errors from multiple stages lead to significant meshing errors between the planetary gears and the input gear, causing problems such as excessive noise, unstable transmission, abnormal sounds, and vibration during operation. This negatively impacts the reducer's lifespan and operational accuracy. Utility Model Content

[0003] The purpose of this invention is to provide an RV reduction structure with high input accuracy, which can improve the stability and coaxiality of the installation connection between the input shaft and the motor, facilitate the quick installation of the input shaft and the motor, improve positioning accuracy and input accuracy, and extend the service life of the motor.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A high-input-precision RV reduction structure includes a pin gear housing, an output shaft, an output end cover, two cycloidal wheels, at least two eccentric shafts arranged in a circumferential array, and an input shaft. The two cycloidal wheels are mounted on two cams on the eccentric shafts, and the cycloidal wheels and the pin gear housing are engaged by needle rollers. An input gear is provided at the end of the input shaft near the output end cover, and a planetary gear that meshes with the input gear is provided at the end of the eccentric shaft. A connecting shaft coaxially arranged with the input gear is connected to the end of the input shaft away from the input gear, and a motor is mounted on the connecting shaft by screws. A support bearing is provided between the outer wall of the input shaft and the inner hole of the output shaft and the inner hole of the output end cover, or two support bearings are provided between the outer wall of the input shaft and the inner hole of the output end cover. A first correction structure or a second correction structure is provided between the connecting shaft and the input shaft.

[0006] By adopting the above technical solution, a support bearing is set between the input shaft, the output shaft, and the output end cover, or two support bearings are set between the input shaft and the output shaft cover. A first or second correction structure is set between the connecting shaft where the motor is installed and the input shaft. The support bearings support the input shaft to prevent it from tilting. The first or second correction structure corrects the misalignment, improving the coaxiality of the input shaft and the motor. Furthermore, no positioning or machining of positioning stops is required between the motor and the RV reducer. The motor shaft is simply inserted into the connecting shaft and positioned with the inner end face of the connecting shaft. This facilitates the rapid installation of the motor and the RV reducer with high coaxiality and good overall installation position. The meshing backlash between the input gear and the planetary gears is small, effectively improving positioning accuracy and transmission accuracy, reducing noise, vibration, and abnormal sounds, and improving the smoothness and service life of the transmission.

[0007] Furthermore, the first correction structure includes a splined shaft coaxially arranged with the input shaft, the inner hole of the splined shaft and the outer wall of the input shaft are engaged by spline teeth, and the splined shaft is detachably mounted on the end of the connecting shaft near the input shaft by screws; a mounting ring coaxial with the splined shaft is provided between the splined shaft and the connecting shaft, a first adjusting diaphragm ring coaxial with the mounting ring and the end of the connecting shaft is provided between the mounting ring and the splined shaft, and a second adjusting diaphragm ring coaxial with the mounting ring and the splined shaft.

[0008] By adopting the above technical solution, the first and second adjusting diaphragm rings are elastic bodies. When the connecting shaft, input shaft, and splined teeth between the splined shaft and input shaft are subjected to axial and radial forces, the first and second adjusting diaphragm rings can undergo a certain elastic deformation, thereby overcoming the coaxiality error between the connecting shaft and input shaft, reducing the requirements for the installation perpendicularity between the body and the RV reducer and the motor, compensating for the position loss when the position of the motor and the body is very poor, and will not affect the splined meshing between the splined shaft and the input shaft, thus ensuring the positioning accuracy of the motor and the RV reducer.

[0009] Furthermore, the first adjusting membrane ring has four first clearance holes arranged in a circumferential array along its axial direction, and the connecting shaft is provided with two first threaded holes and two first countersunk holes. The two first threaded holes are arranged symmetrically at 180°, and the two first countersunk holes are arranged symmetrically at 180°. The two first threaded holes and the two first countersunk holes are arranged in a circumferential array and spaced apart. The two first threaded holes and the two first countersunk holes are also connected to the four first clearance holes one by one and are coaxially arranged.

[0010] The mounting ring is provided with two second threaded holes and two second countersunk holes that pass through it along its axial direction. The two second threaded holes correspond one-to-one with the two first countersunk holes and are coaxially connected through the corresponding first clearance holes. The two second countersunk holes correspond one-to-one with the two first threaded holes and are coaxially connected through the corresponding first clearance holes.

[0011] The connecting shaft is provided with a first boss corresponding to two first threaded holes, and the mounting ring is provided with a second boss corresponding to two second threaded holes on its end face near the connecting shaft; a first screw is installed in the corresponding first threaded hole, first clearance hole and second countersunk hole, the nut of the first screw is sunk into the second countersunk hole, and the side of the first adjusting diaphragm ring near the connecting shaft is in contact with the two first bosses; a second screw is installed in the corresponding second threaded hole, first clearance hole and first countersunk hole, the nut of the second screw is sunk into the first countersunk hole, and the side of the first adjusting diaphragm ring near the mounting ring is in contact with the two second bosses.

[0012] By adopting the above technical solution, the first adjusting diaphragm ring is installed between the connecting shaft and the mounting ring using the first screw and the second screw. Both end faces of the first adjusting diaphragm ring and the corresponding connecting shaft and mounting ring are supported and contacted at two points via the first boss and the second boss. This ensures that the first adjusting diaphragm ring, the connecting shaft, and the mounting ring have a certain degree of rigidity, while also allowing the first adjusting diaphragm ring to deform to overcome errors when subjected to forces in various directions. The first screw and the second screw are respectively recessed into the corresponding second countersunk hole and first countersunk hole to prevent the nuts from protruding and affecting the end face contact between the first adjusting diaphragm ring and the connecting shaft and the mounting ring, thus ensuring the normal working effect of the first adjusting diaphragm ring.

[0013] Furthermore, the second adjusting diaphragm ring has four second clearance holes arranged in a circumferential array along its axial direction, and the spline shaft is provided with two third threaded holes and two third countersunk holes. The two third threaded holes are arranged symmetrically at 180°, and the two third countersunk holes are arranged symmetrically at 180°. The two third threaded holes and the two third countersunk holes are arranged in a circumferential array and spaced apart. The two third threaded holes and the two third countersunk holes are also connected to the four second clearance holes one by one and are coaxially arranged.

[0014] The mounting ring is provided with two fourth threaded holes and two fourth countersunk holes that pass through it along its axial direction. The two fourth threaded holes correspond one-to-one with the two third countersunk holes and are coaxially connected through corresponding second clearance holes. The two fourth countersunk holes correspond one-to-one with the two third threaded holes and are coaxially connected through corresponding second clearance holes. The two second threaded holes, two fourth threaded holes, two second countersunk holes, and two fourth countersunk holes on the mounting ring are arranged in a circumferential array, and the fourth threaded holes and fourth countersunk holes are respectively located between adjacent second threaded holes and second countersunk holes.

[0015] The splined shaft is provided with a third boss corresponding to the two third threaded holes, and the mounting ring is provided with a fourth boss corresponding to the two fourth threaded holes on its end face near the splined shaft; a third screw is installed in the corresponding third threaded hole, the second clearance hole and the fourth countersunk hole, the nut of the third screw is recessed into the fourth countersunk hole, and the side of the second adjusting diaphragm ring near the splined shaft contacts the two third bosses; a fourth screw is installed in the corresponding fourth threaded hole, the second clearance hole and the third countersunk hole, the nut of the fourth screw is recessed into the third countersunk hole, and the side of the second adjusting diaphragm ring near the mounting ring contacts the two fourth bosses.

[0016] By adopting the above technical solution, the second adjusting diaphragm ring is installed between the splined shaft and the mounting ring using the third and fourth screws. The two end faces of the second adjusting diaphragm ring and the corresponding splined shaft and mounting ring are supported and contacted at two points by the third and fourth bosses, respectively. This ensures that the second adjusting diaphragm ring, splined shaft, and mounting ring have a certain degree of rigidity while also allowing the second adjusting diaphragm ring to deform under forces in various directions to overcome errors. Specifically, the two second threaded holes, two fourth threaded holes, two second countersunk holes, and two fourth countersunk holes on the mounting ring are arranged in a circumferential array, with the fourth threaded holes and fourth countersunk holes located between adjacent second threaded holes and second countersunk holes. This staggered arrangement of the eight holes avoids interference. Furthermore, the screws of the third and fourth screws are recessed into the corresponding fourth and third countersunk holes, respectively, preventing the nuts from protruding and affecting the end face contact between the second adjusting diaphragm ring, splined shaft, and mounting ring, thus ensuring the normal working effect of the second adjusting diaphragm ring.

[0017] Furthermore, both the first and second adjusting membrane rings include a plurality of elastic membranes arranged in an array along their axial direction, and the sidewalls of adjacent elastic membranes are in contact with each other.

[0018] By adopting the above technical solution, both the first and second adjusting diaphragm rings are composed of a combination of several elastic diaphragms along their bearing array. The number of elastic diaphragms in the first and second adjusting diaphragm rings can be adjusted according to actual usage requirements to ensure the working effect of the first and second adjusting diaphragm rings and effectively improve the applicability.

[0019] Furthermore, the second correction structure includes spherical spline teeth disposed between the inner hole of the connecting shaft and the outer wall of the input shaft. The tooth profile and direction of the spherical spline teeth are both convex and modified, and they are close to point contact when meshing.

[0020] By adopting the above technical solution, spherical splines with uniformly convex tooth profiles and directions are used to achieve tooth meshing between the connecting shaft and the input shaft. This allows the spherical splines to achieve small-angle rotational freedom in multiple directions along the axial axis, while also transmitting rotational torque. This ensures the coaxiality of the connecting shaft and the input shaft, while avoiding the radial force affecting the internal bearings of the motor caused by poor motor rotational accuracy and performance in existing technologies. This guarantees the motor's working efficiency and service life, and reduces motor vibration.

[0021] Furthermore, the supporting bearing is one of a deep groove ball bearing, an angular contact ball bearing, a tapered roller bearing, or a cylindrical roller bearing.

[0022] By adopting the above technical solution, the type of support bearing can be selected according to actual usage requirements, ensuring its working effect while reducing the impact of the support bearing on the outer diameter of the RV reducer and reducing costs.

[0023] In summary, this utility model has the following beneficial effects:

[0024] 1. In this utility model, a support bearing is set between the input shaft, the output shaft, and the output end cover, or two support bearings are set between the input shaft and the output shaft cover. The support bearings support the input shaft to prevent it from tilting. The first or second correction structure is used for correction, which improves the coaxiality of the input shaft and the motor. The motor and the RV reducer do not need to be positioned or have a positioning stop machined. The motor shaft is simply inserted into the connecting shaft and positioned with the inner end face of the connecting shaft. This facilitates the quick installation of the motor and the RV reducer with high coaxiality and good overall installation position. The meshing backlash between the input gear and the planetary gear is small, which effectively improves the positioning accuracy and transmission accuracy, reduces noise, vibration, and abnormal noise, and improves the smoothness and service life of the transmission.

[0025] 2. The first correction structure in this utility model includes a splined shaft, a mounting ring, a first adjusting diaphragm ring, and a second adjusting diaphragm ring. When the connecting shaft, the input shaft, and the splined teeth between the splined shaft and the input shaft are subjected to axial and radial forces, the first adjusting diaphragm ring and the second adjusting diaphragm ring can undergo a certain elastic deformation, thereby overcoming the coaxiality error between the connecting shaft and the input shaft, reducing the requirements for the installation perpendicularity between the body and the RV reducer and the motor, compensating for the position loss when the position of the motor and the body is very poor, and will not affect the splined teeth meshing between the splined shaft and the input shaft, thus ensuring the positioning accuracy of the motor and the RV reducer.

[0026] 3. The second correction structure in this utility model includes spherical splines with a uniformly drum-shaped tooth profile and tooth direction. These spherical splines along the axis of rotation allow for small-angle rotational freedom in multiple directions and can also transmit rotational torque. This ensures the coaxiality of the connecting shaft and the input shaft while avoiding the radial force affecting the internal bearings of the motor caused by poor motor rotational accuracy and performance in existing technologies. This ensures the motor's working efficiency and service life, and reduces motor vibration. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a high-input-precision RV reduction structure, used to show that the first correction structure and the support bearing are respectively set between the input shaft, the output shaft and the output end cover;

[0028] Figure 2 This is a schematic diagram of the overall structure of a high-input-precision RV reduction structure, which shows that the second correction structure and the support bearing are both located between the input shaft and the output end cover.

[0029] Figure 3 This is an exploded structural diagram of the first correction structure in a high-input-precision RV deceleration structure;

[0030] Figure 4 This is a schematic diagram of the first adjusting diaphragm ring in a high-input-precision RV deceleration structure;

[0031] Figure 5 This is a schematic diagram of the connecting shaft in a high-input-precision RV reduction structure;

[0032] Figure 6 This is a schematic diagram of the mounting ring in a high-input-precision RV reduction structure;

[0033] Figure 7 This is a schematic diagram of the second adjusting diaphragm ring in a high-input-precision RV deceleration structure;

[0034] Figure 8 This is a schematic diagram of the spline shaft in a high-input-precision RV reduction structure;

[0035] Figure 9 This is a schematic diagram of the modification of the second correction structure in a high input accuracy RV deceleration structure, where (a) is the left tooth surface tooth profile drum shape modification, (b) is the right tooth surface tooth profile drum shape modification, (c) is the left tooth surface tooth direction drum shape modification, and (d) is the right tooth surface tooth direction drum shape modification.

[0036] In the diagram, 01 is the needle housing; 011 is the needle roller; 02 is the output shaft; 03 is the output end cover; 04 is the cycloidal wheel; 05 is the eccentric shaft; 051 is the planetary gear; 06 is the input shaft; 061 is the input gear; 062 is the support bearing; 07 is the first correction structure; 08 is the second correction structure; 1 is the connecting shaft; 11 is the first threaded hole; 12 is the first countersunk hole; 13 is the first boss; 14 is the first screw; 2 is the mounting ring; 21 is the second screw. 21. Pits; 22. Second countersunk hole; 23. Second boss; 24. Second screw; 25. Fourth threaded hole; 26. Fourth countersunk hole; 27. Fourth boss; 28. Fourth screw; 3. Splined shaft; 31. Third threaded hole; 32. Third countersunk hole; 33. Third boss; 34. Third screw; 4. First adjusting diaphragm ring; 41. First clearance hole; 5. Second adjusting diaphragm ring; 51. Second clearance hole; 6. Elastic diaphragm; 7. Spherical spline teeth. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0038] A high-input-precision RV reduction structure, such as Figure 1 or Figure 2 As shown, its RV basic structure and working principle are the same as those in the prior art, including a needle-tooth housing 01, an output shaft 02, an output end cover 03, two cycloidal wheels 04, at least two eccentric shafts 05 arranged in a circular array, and an input shaft 06. The two cycloidal wheels 04 are mounted on two cams of the eccentric shafts 05, and the cycloidal wheels 04 and the needle-tooth housing 01 are engaged by needle rollers 011. An input gear 061 is provided at one end of the input shaft 06 near the output end cover 03, and a planetary gear 051 that meshes with the input gear 061 is provided at the end of the eccentric shaft 05. When the motor drives the input shaft 06 to rotate, a two-stage reduction transmission is achieved through the meshing of the input gear 061 with the planetary gear 051 and the meshing of the needle rollers 011 between the cycloidal wheels 04 and the needle-tooth housing 01.

[0039] The difference is, such as Figure 1 and Figure 2As shown, a connecting shaft 1, coaxially arranged with the input shaft 06, is connected to the end of the input shaft 06 furthest from the input gear 061. The motor is mounted on the connecting shaft 1 with screws. To improve the coaxiality of the input shaft 06 and the connecting shaft 1, i.e., to improve the positioning accuracy of the motor and the input shaft 06, a support bearing 062 is provided between the outer wall of the input shaft 06 and the inner hole of the output shaft 02 and the inner hole of the output end cover 03, respectively. Alternatively, two support bearings 062 are provided between the outer wall of the input shaft 06 and the inner hole of the output end cover 03. A first correction structure 07 or a second correction structure 08 is provided between the connecting shaft 1 and the input shaft 06. The support bearing 062 is one of a deep groove ball bearing, an angular contact ball bearing, a tapered roller bearing, or a cylindrical roller bearing, which can be selected according to actual usage requirements. Similarly, only one of the first correction structure 07 and the second correction structure 08 needs to be selected based on actual usage requirements.

[0040] like Figure 1 and Figure 2 As shown, the input shaft 06 is supported by the support bearing 062 to prevent it from tilting. The first correction structure 07 or the second correction structure 08 is used for correction, improving the coaxiality of the input shaft 06 and the motor. No positioning or machining of positioning stops is required between the motor and the RV reducer. The motor shaft is simply inserted into the connecting shaft 1 and positioned with the inner end face of the connecting shaft 1. This facilitates quick installation of the motor and the RV reducer with high coaxiality and good overall installation position. The meshing backlash between the input gear 061 and the planetary gear 051 is small, effectively improving positioning accuracy and transmission accuracy, reducing noise, vibration, and abnormal sounds, and improving the smoothness and service life of the transmission.

[0041] Specifically, such as Figure 1 and Figure 3 As shown, the first correction structure 07 includes a splined shaft 3 coaxially arranged with the input shaft 06. The inner hole of the splined shaft 3 and the outer wall of the input shaft 06 are engaged by spline teeth. The splined shaft 3 is detachably mounted on the end of the connecting shaft 1 near the input shaft 06 by screws. A mounting ring 2, coaxial with the splined shaft 3, is provided between the splined shaft 3 and the connecting shaft 1. A first adjusting diaphragm ring 4, coaxial with the mounting ring 2, is provided between the mounting ring 2 and the end of the connecting shaft 1. A second adjusting diaphragm ring 5, coaxial with the mounting ring 2 and the splined shaft 3, is provided between the mounting ring 2 and the splined shaft 3. Wherein, as... Figure 4 and Figure 7 As shown, both the first adjusting membrane ring 4 and the second adjusting membrane ring 5 include a plurality of elastic diaphragms 6 arranged in an array along their axial direction, and the sidewalls of adjacent elastic diaphragms 6 are in contact with each other.

[0042] like Figure 1 and Figure 3As shown, the first adjusting diaphragm ring 4 and the second adjusting diaphragm ring 5 are elastic bodies. When the connecting shaft 1, the input shaft 06, and the spline teeth between the spline shaft 3 and the input shaft 06 are subjected to axial and radial forces, the first adjusting diaphragm ring 4 and the second adjusting diaphragm ring 5 can undergo a certain elastic deformation, thereby overcoming the coaxiality error between the connecting shaft 1 and the input shaft 06, reducing the requirements for the installation perpendicularity between the body and the RV reducer and the motor, compensating for the position loss when the position of the motor and the body is very poor, and will not affect the spline meshing between the spline shaft 3 and the input shaft 06, thus ensuring the positioning accuracy of the motor and the RV reducer.

[0043] like Figure 4 , Figure 5 and Figure 6 As shown, to facilitate the installation of the first adjusting membrane ring 4, four first clearance holes 41 are arranged circumferentially on the first adjusting membrane ring 4, passing through it along its axial direction. The connecting shaft 1 has two first threaded holes 11 and two first countersunk holes 12. The two first threaded holes 11 and the two first countersunk holes 12 are arranged 180° symmetrically. The two first threaded holes 11 and the two first countersunk holes 12 are arranged circumferentially and spaced apart. The two first threaded holes 11 and the two first countersunk holes 12 are also coaxially connected to the four first clearance holes 41. The mounting ring 2 has two second threaded holes 21 and two second countersunk holes 22, passing through it along its axial direction. The two second threaded holes 21 correspond to the two first countersunk holes 12 and are coaxially connected through the corresponding first clearance holes 41. The two second countersunk holes 22 correspond to the two first threaded holes 11 and are coaxially connected through the corresponding first clearance holes 41.

[0044] like Figures 3 to 6 As shown, a first boss 13 corresponding to two first threaded holes 11 is provided on the connecting shaft 1, and a second boss 23 corresponding to two second threaded holes 21 is provided on the end face of the mounting ring 2 near the connecting shaft 1. A first screw 14 is installed in the corresponding first threaded hole 11, first clearance hole 41 and second countersunk hole 22. The nut of the first screw 14 is recessed into the second countersunk hole 22, and the side of the first adjusting diaphragm ring 4 near the connecting shaft 1 contacts the two first bosses 13. A second screw 24 is installed in the corresponding second threaded hole 21, first clearance hole 41 and first countersunk hole 12. The nut of the second screw 24 is recessed into the first countersunk hole 12, and the side of the first adjusting diaphragm ring 4 near the mounting ring 2 contacts the two second bosses 23.

[0045] like Figures 3 to 6As shown, the first adjusting diaphragm ring 4 is installed between the connecting shaft 1 and the mounting ring 2 using the first screw 14 and the second screw 24. The two end faces of the first adjusting diaphragm ring 4 and the corresponding connecting shaft 1 and mounting ring 2 are supported and contacted by the first boss 13 and the second boss 23. This ensures that the first adjusting diaphragm ring 4, the connecting shaft 1 and the mounting ring 2 have a certain rigidity and that the first adjusting diaphragm ring 4 can deform to a certain extent when subjected to forces in various directions to overcome errors.

[0046] like Figure 7 and Figure 8 As shown, in order to realize the installation of the second adjusting diaphragm ring 5, there are four second clearance holes 51 arranged in a circumferential array on the second adjusting diaphragm ring 5, which pass through it along its axial direction. There are two third threaded holes 31 and two third countersunk holes 32 on the spline shaft 3. The two third threaded holes 31 are arranged symmetrically at 180°, and the two third countersunk holes 32 are arranged symmetrically at 180°. The two third threaded holes 31 and the two third countersunk holes 32 are arranged in a circumferential array and are spaced apart. The two third threaded holes 31 and the two third countersunk holes 32 are also connected to the four second clearance holes 51 one by one and are coaxially arranged.

[0047] like Figures 6 to 8 As shown, the mounting ring 2 has two fourth threaded holes 25 and two fourth countersunk holes 26 that pass through it along its axial direction. The two fourth threaded holes 25 correspond one-to-one with the two third countersunk holes 32 and are coaxially connected through the corresponding second clearance holes 51. The two fourth countersunk holes 26 correspond one-to-one with the two third threaded holes 31 and are coaxially connected through the corresponding second clearance holes 51. The two second threaded holes 21, two fourth threaded holes 25, two second countersunk holes 22, and two fourth countersunk holes 26 on the mounting ring 2 are arranged in a circumferential array, and the fourth threaded holes 25 and fourth countersunk holes 26 are located between adjacent second threaded holes 21 and second countersunk holes 22, respectively. In this way, the eight holes on the mounting ring 2 are staggered to avoid interference.

[0048] like Figure 3 , Figures 6 to 8 As shown, a third boss 33 corresponding to the two third threaded holes 31 is provided on the splined shaft 3, and a fourth boss 27 corresponding to the two fourth threaded holes 25 is provided on the end face of the mounting ring 2 near the splined shaft 3. A third screw 34 is installed in the corresponding third threaded hole 31, the second clearance hole 51, and the fourth countersunk hole 26. The nut of the third screw 34 is recessed into the fourth countersunk hole 26, and the side of the second adjusting diaphragm ring 5 near the splined shaft 3 contacts the two third bosses 33. A fourth screw 28 is installed in the corresponding fourth threaded hole 25, the second clearance hole 51, and the third countersunk hole 32. The nut of the fourth screw 28 is recessed into the third countersunk hole 32, and the side of the second adjusting diaphragm ring 5 near the mounting ring 2 contacts the two fourth bosses 27.

[0049] Similarly, as Figure 3 , Figures 6 to 8 As shown, the second adjusting diaphragm ring 5 is installed between the spline shaft 3 and the mounting ring 2 using the third screw 34 and the fourth screw 28. The two end faces of the second adjusting diaphragm ring 5 and the corresponding spline shaft 3 and mounting ring 2 are supported and contacted at two points by the third boss 33 and the fourth boss 27, so that the second adjusting diaphragm ring 5, the spline shaft 3 and the mounting ring 2 have a certain rigidity and ensure that the second adjusting diaphragm ring 5 can produce a certain deformation when subjected to forces in various directions to overcome errors.

[0050] In this embodiment, as Figure 2 and Figure 9 As shown, the second correction structure 08 includes spherical spline teeth 7 disposed between the inner hole of the connecting shaft 1 and the outer wall of the input shaft 06. The tooth profile and tooth direction of the spherical spline teeth 7 are as shown in the figure. Figure 9 The tooth profile is modified into a drum shape, and the meshing operation is close to point contact. The tooth meshing between the connecting shaft 1 and the input shaft 06 is achieved using spherical spline teeth 7 with a uniformly drum-shaped tooth profile and tooth direction. This allows the spherical spline teeth 7 to achieve small-angle rotational freedom in multiple directions along the axial axis, and also transmits rotational torque. This ensures the coaxiality of the connecting shaft 1 and the input shaft 06 while avoiding the radial force affecting the internal bearings of the motor caused by poor motor rotational accuracy and performance in existing technologies, thus ensuring motor efficiency and service life, and reducing motor vibration.

[0051] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A high-input-precision RV reduction structure, comprising a needle gear housing (01), an output shaft (02), an output end cover (03), two cycloidal wheels (04), at least two eccentric shafts (05) arranged in a circular array, and an input shaft (06), wherein the two cycloidal wheels (04) are mounted on two cams of the eccentric shafts (05), and the cycloidal wheels (04) and the needle gear housing (01) are meshed by needle rollers (011); an input gear (061) is provided at one end of the input shaft (06) near the output end cover (03), and a planetary gear (051) meshing with the input gear (061) is provided at the end of the eccentric shaft (05); characterized in that: The input shaft (06) is connected to a connecting shaft (1) coaxially with the input gear (061) at one end. The motor is mounted on the connecting shaft (1) by screws. A support bearing (062) is provided between the outer wall of the input shaft (06) and the inner hole of the output shaft (02) and the inner hole of the output end cover (03), or two support bearings (062) are provided between the outer wall of the input shaft (06) and the inner hole of the output end cover (03). A first correction structure (07) or a second correction structure (08) is provided between the connecting shaft (1) and the input shaft (06).

2. The high input accuracy RV reduction structure according to claim 1, characterized in that: The first correction structure (07) includes a spline shaft (3) coaxially arranged with the input shaft (06). The inner hole of the spline shaft (3) and the outer wall of the input shaft (06) are engaged by spline teeth. The spline shaft (3) is detachably installed on the end of the connecting shaft (1) near the input shaft (06) by screws. A mounting ring (2) coaxial with the spline shaft (3) and the connecting shaft (1) is provided. A first adjusting membrane ring (4) coaxial with the mounting ring (2) and the end of the connecting shaft (1) is provided. A second adjusting membrane ring (5) coaxial with the mounting ring (2) and the spline shaft (3) is provided.

3. The high input accuracy RV reduction structure according to claim 2, characterized in that: The first adjusting membrane ring (4) has four first clearance holes (41) arranged in a circumferential array along its axial direction. The connecting shaft (1) is provided with two first threaded holes (11) and two first countersunk holes (12). The two first threaded holes (11) are arranged symmetrically at 180°. The two first countersunk holes (12) are arranged symmetrically at 180°. The two first threaded holes (11) and the two first countersunk holes (12) are arranged in a circumferential array and spaced apart. The two first threaded holes (11) and the two first countersunk holes (12) are also connected to the four first clearance holes (41) one by one and are coaxially arranged. The mounting ring (2) is provided with two second threaded holes (21) and two second countersunk holes (22) that pass through it along its axial direction. The two second threaded holes (21) correspond one-to-one with the two first countersunk holes (12) and are coaxially connected through the corresponding first clearance holes (41). The two second countersunk holes (22) correspond one-to-one with the two first threaded holes (11) and are coaxially connected through the corresponding first clearance holes (41). The connecting shaft (1) is provided with a first boss (13) corresponding to two first threaded holes (11), and the mounting ring (2) is provided with a second boss (23) corresponding to two second threaded holes (21) on the end face near the connecting shaft (1); a first screw (14) is installed in the corresponding first threaded hole (11), first clearance hole (41) and second countersunk hole (22), the nut of the first screw (14) is sunk into the second countersunk hole (22), and the side of the first adjusting diaphragm ring (4) near the connecting shaft (1) is in contact with the two first bosses (13); a second screw (24) is installed in the corresponding second threaded hole (21), first clearance hole (41) and first countersunk hole (12), the nut of the second screw (24) is sunk into the first countersunk hole (12), and the side of the first adjusting diaphragm ring (4) near the mounting ring (2) is in contact with the two second bosses (23).

4. The high input accuracy RV reduction structure according to claim 3, characterized in that: The second adjusting membrane ring (5) has four second clearance holes (51) arranged in a circumferential array along its axial direction. The spline shaft (3) is provided with two third threaded holes (31) and two third countersunk holes (32). The two third threaded holes (31) are arranged symmetrically at 180°. The two third countersunk holes (32) are arranged symmetrically at 180°. The two third threaded holes (31) and the two third countersunk holes (32) are arranged in a circumferential array and spaced apart. The two third threaded holes (31) and the two third countersunk holes (32) are also connected to the four second clearance holes (51) one by one and are coaxially arranged. The mounting ring (2) is provided with two fourth threaded holes (25) and two fourth countersunk holes (26) that pass through it along its axial direction. The two fourth threaded holes (25) correspond one-to-one with the two third countersunk holes (32) and are coaxially connected through the corresponding second clearance holes (51). The two fourth countersunk holes (26) correspond one-to-one with the two third threaded holes (31) and are coaxially connected through the corresponding second clearance holes (51). The two second threaded holes (21), two fourth threaded holes (25), two second countersunk holes (22), and two fourth countersunk holes (26) on the mounting ring (2) are arranged in a circumferential array, and the fourth threaded holes (25) and fourth countersunk holes (26) are respectively located between adjacent second threaded holes (21) and second countersunk holes (22). The spline shaft (3) is provided with a third boss (33) corresponding to the two third threaded holes (31). The mounting ring (2) is provided with a fourth boss (27) corresponding to the two fourth threaded holes (25) on the end face near the spline shaft (3). A third screw (34) is installed in the corresponding third threaded hole (31), second clearance hole (51) and fourth countersunk hole (26). The nut of the third screw (34) is sunk into the fourth countersunk hole (26), and the side of the second adjusting diaphragm ring (5) near the spline shaft (3) is in contact with the two third bosses (33). A fourth screw (28) is installed in the corresponding fourth threaded hole (25), second clearance hole (51) and third countersunk hole (32). The nut of the fourth screw (28) is sunk into the third countersunk hole (32), and the side of the second adjusting diaphragm ring (5) near the mounting ring (2) is in contact with the two fourth bosses (27).

5. The RV reduction structure with high input accuracy according to claim 2, characterized in that: The first adjusting membrane ring (4) and the second adjusting membrane ring (5) each include a plurality of elastic membranes (6) arranged in an array along their axial direction, and the sidewalls of adjacent elastic membranes (6) are in contact with each other.

6. The RV reduction structure with high input accuracy according to claim 1, characterized in that: The second correction structure (08) includes a spherical spline tooth (7) disposed between the inner hole of the connecting shaft (1) and the outer wall of the input shaft (06). The tooth shape and tooth direction of the spherical spline tooth (7) are both convex and modified, and they are close to point contact when meshing.

7. The RV reduction structure with high input accuracy according to claim 1, characterized in that: The support bearing (062) is one of a deep groove ball bearing, an angular contact ball bearing, a tapered roller bearing, or a cylindrical roller bearing.

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