Variable-tooth-thickness self-clearance-eliminating planetary reducer
By designing a tooth-changing thick teeth and an automatic pushing mechanism in a planetary reducer, the transmission error problem caused by meshing gap is solved, and higher transmission accuracy is achieved.
Patent Information
- Application Number
- CN202420173205.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-22
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-22
AI Technical Summary
Planetary reducers have transmission errors due to gear design errors, manufacturing errors and assembly errors, which limit their application in high-precision equipment.
Design a planetary reducer with a variable tooth thickness and self-clearing gap. By setting a variable tooth thickness with gradually changing axial thickness on the inner ring, planetary wheel and sun gear, it is equipped with an automatic pushing mechanism, including axial thrust spring and plane thrust bearings , automatically eliminates the meshing gap between the planetary wheel, the inner ring gear and the sun gear.
Effectively reduce or even eliminate the transmission error of the planetary reducer, improve the transmission accuracy, and ensure stable performance on high-precision equipment.
Smart Images
Figure CN222163414U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of reducers, in particular to a planetary reducer. Background Art
[0002] The main function of the reducer is to match the speed and transmit torque between the prime mover and the actuator. There are many types of reducers, and planetary reducers are one of them. The planetary reducer includes a ring gear, a sun gear, and a planetary gear meshing with the gear and the sun gear. The planetary gear is set on the planetary carrier. The power can be transmitted to the sun gear through the input shaft. After being decelerated by the planetary gear mechanism, the power is output by the planetary carrier. The planetary reducer has the characteristics of small structural size, large output torque, large speed ratio, high efficiency, safe and reliable performance. However, due to the influence of factors such as gear design error, manufacturing error, and assembly error, there is a gap between the planetary gear and the ring gear, and between the planetary gear and the sun gear of the planetary reducer. The existence of the gap will cause the planetary reducer to have a transmission error. The existence of the transmission error will cause the actual output angle of the reducer to be unequal to the theoretical output angle, which will hinder the application of the planetary reducer in high-precision equipment.
[0003] Traditional methods for reducing the transmission error of planetary reducers include: improving gear size accuracy, reducing tooth thickness tolerance, reducing gear meshing clearance, etc. However, these traditional methods cannot completely eliminate the gear meshing clearance, and as the tooth surface wears during use, the gear meshing clearance will gradually increase, and the gear meshing clearance cannot be automatically eliminated, causing the transmission error of the planetary reducer to gradually increase. Utility Model Content
[0004] In view of this, the purpose of the utility model is to provide a variable tooth thickness self-clearing planetary reducer to solve the technical problem of automatically eliminating the gap between the planetary gear and the ring gear, and the planetary gear and the sun gear of the planetary reducer, and improving the transmission accuracy of the planetary reducer.
[0005] The utility model discloses a variable tooth thickness self-clearing planetary reducer, comprising an inner gear ring, a sun gear and a planet carrier, wherein the planet carrier is provided with a planetary gear shaft, and the planetary gear is provided on the planetary gear shaft, and the planetary gear is meshed with the inner gear ring and the sun gear respectively;
[0006] The teeth of the inner gear ring, planetary gear and sun gear are all variable thickness teeth whose axial thickness gradually changes from one end to the other end. The small ends of the teeth on the planetary gear are respectively matched with the large ends of the teeth on the inner gear ring and the sun gear, and the large ends of the teeth on the planetary gear are respectively matched with the small ends of the teeth on the inner gear ring and the sun gear;
[0007] The variable tooth thickness self-clearing planetary reducer also includes a first clearing mechanism that automatically pushes the planetary gear to move axially toward the inner gear ring to eliminate the meshing gap between the planetary gear and the inner gear ring;
[0008] The variable tooth thickness self-backlash eliminating planetary reducer also includes a second backlash eliminating mechanism that automatically pushes the sun wheel to move axially toward the planet wheel to eliminate the meshing clearance between the sun wheel and the planet wheel.
[0009] Furthermore, the first backlash elimination mechanism comprises an axial thrust spring and a planar thrust bearing which are passed through the planetary gear shaft, and the planar thrust bearing is located between the end face of the planetary gear and the axial thrust spring.
[0010] Furthermore, the axial thrust spring passing through the planetary gear shaft is a disc spring.
[0011] Furthermore, the first backlash elimination mechanism also includes a gasket arranged between the end of the axial thrust spring and the planet carrier.
[0012] Furthermore, the first backlash eliminating mechanism also includes a pre-tightening screw arranged on the planet carrier for adjusting the position of the gasket.
[0013] Furthermore, the second clearance eliminating mechanism includes a rolling bearing connecting the sun gear and the planet carrier, a spring seat arranged on the planet carrier, and an axial thrust spring arranged between the spring seat and the rolling bearing to apply thrust to the outer ring of the rolling bearing.
[0014] Furthermore, the axial thrust spring is arranged between the spring seat and the rolling bearing to apply thrust to the outer ring of the rolling bearing.
[0015] Furthermore, the spring seat is a retaining ring or a nut.
[0016] Furthermore, the variable thickness teeth of the inner gear ring, sun gear and planetary gear are straight teeth or helical teeth.
[0017] Beneficial effects of the utility model:
[0018] The utility model discloses a variable tooth thickness self-eliminating backlash planetary reducer, wherein the teeth of the inner gear ring, the planetary gear and the sun gear are all variable tooth thickness teeth, and the planetary gear is automatically pushed to move toward the inner gear ring by a first backlash eliminating mechanism, and the sun gear is automatically pushed to move toward the planetary gear by a second backlash eliminating mechanism, thereby automatically eliminating the meshing clearance between the inner gear ring and the planetary gear and the meshing clearance between the sun gear and the planetary gear, thereby greatly reducing or even eliminating the transmission error of the planetary reducer, and improving the transmission accuracy of the planetary reducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the structure of a variable tooth thickness self-eliminating backlash planetary reducer.
[0020] Figure 2 It is a schematic diagram of another implementation structure of a variable tooth thickness self-clearing planetary reducer.
[0021] Figure 3Schematic diagram of the matching of the teeth on the planetary gear and the teeth on the inner ring gear. DETAILED DESCRIPTION
[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0023] like Figure 1 and Figure 2 As shown, the variable tooth thickness self-clearing planetary reducer of this embodiment includes an inner gear ring 1, a sun gear 2 and a planet carrier 3, on which a planetary gear shaft 4 is arranged, on which a planetary gear 5 is arranged, and the planetary gears are meshed with the inner gear ring and the sun gear respectively. In this embodiment, the sun gear 2 is composed of a rotating shaft connecting section 201 and a gear section 202. Of course, in different implementations, the rotating shaft connecting section 201 and the gear section 202 are also made into one piece.
[0024] In this embodiment, the teeth of the inner gear ring, planetary gear and sun gear are all variable thickness teeth whose axial thickness gradually changes from one end to the other. Figure 3 As shown, the small ends of the teeth on the planetary gears are matched with the large ends of the teeth on the inner gear ring and the sun gear, respectively, and the large ends of the teeth on the planetary gears are matched with the small ends of the teeth on the inner gear ring and the sun gear, respectively. In a specific implementation, the variable tooth thickness teeth of the inner gear ring, the planetary gear and the sun gear can be straight teeth or helical teeth.
[0025] The variable tooth thickness self-clearing backlash planetary reducer also includes a first backlash eliminating mechanism that automatically pushes the planetary wheel to move axially toward the inner gear ring to eliminate the meshing gap between the planetary wheel and the inner gear ring.
[0026] The variable tooth thickness self-backlash eliminating planetary reducer also includes a second backlash eliminating mechanism that automatically pushes the sun wheel to move axially toward the planet wheel to eliminate the meshing clearance between the sun wheel and the planet wheel.
[0027] In this embodiment, the first clearance elimination mechanism includes an axial thrust spring 6 and a plane thrust bearing 7 that are passed through the planetary gear shaft, and the plane thrust bearing is located between the end face of the planetary gear and the axial thrust spring. In this embodiment, the axial thrust spring 6 is a disc spring. Of course, in different embodiments, the axial thrust spring 6 can also be in other forms such as a wave spring. By applying an axial thrust to the planetary gear 5 using the axial thrust spring 6, the planetary gear 5 can be moved axially, so that the tooth surfaces on both sides of each tooth on the planetary gear 5 are in contact with the teeth on the inner gear ring 1 at the same time, so that the meshing clearance between the planetary gear 5 and the inner gear ring 1 can be automatically eliminated; even if friction and wear occur on the teeth on the planetary gear 5 and the inner gear ring 1 during operation, since the planetary gear 5 can automatically move axially under the push of the first clearance elimination mechanism, the meshing clearance caused by friction and wear can still be automatically eliminated.
[0028] In this embodiment, the second clearance eliminating mechanism includes a rolling bearing 8 connecting the sun gear and the planet carrier, a spring seat 9 arranged on the planet carrier, and an axial thrust spring 10 arranged between the spring seat and the rolling bearing to apply thrust to the outer ring of the rolling bearing 8. In this embodiment, the axial thrust spring 10 arranged between the spring seat and the rolling bearing to apply thrust to the outer ring of the rolling bearing is a disc spring, and of course, other forms such as wave springs can also be used in different embodiments. The spring seat 9 described in this embodiment is a retaining ring, and of course, other forms such as nuts can be used in different embodiments. The axial thrust spring 10 applies thrust to the outer ring of the rolling bearing 8, so that the sun gear 2 can move axially by using the axial thrust spring 10, so that the tooth surfaces on both sides of each tooth on the sun gear 2 are in contact with the teeth on the planet gear 5 at the same time, so that the meshing clearance between the sun gear 2 and the planet gear 5 can be automatically eliminated; even if friction wear occurs on the teeth on the sun gear 2 and the planet gear 5 during operation, since the sun gear 2 can automatically move axially under the push of the second clearance eliminating mechanism, the meshing clearance caused by friction wear can still be automatically eliminated.
[0029] As an improvement to the above embodiment, the first backlash elimination mechanism further includes a gasket 11 disposed between the end of the axial thrust spring 6 and the planet carrier. By selecting gaskets of different thicknesses, the installation height of the axial thrust spring 6 can be adjusted, thereby adjusting the axial thrust of the axial thrust spring 6 on the planet gear 5.
[0030] As an improvement to the above embodiment, the first backlash elimination mechanism further comprises a pre-tightening screw 12 arranged on the planet carrier for adjusting the position of the gasket 11. By adjusting the installation position of the gasket 11 by the pre-tightening screw, the axial thrust of the axial thrust spring 6 on the planetary gear 5 can be adjusted.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A variable tooth thickness self-backlash planetary reducer, comprising an inner ring gear, a sun gear, and a planet carrier, wherein the planet carrier is provided with a planetary gear shaft, and the planetary gears are provided on the planetary gear shaft, and the planetary gears are meshed with the inner ring gear and the sun gear, respectively, and characterized in that: The teeth of the inner ring gear, planetary gears and sun gear are all variable thickness teeth with axial thickness gradually changing from one end to the other. The small ends of the teeth on the planetary gears are respectively matched with the large ends of the teeth on the inner ring gear and the sun gear, and the large ends of the teeth on the planetary gears are respectively matched with the small ends of the teeth on the inner ring gear and the sun gear. The variable tooth thickness self-clearing planetary reducer also includes a first clearing mechanism that automatically pushes the planetary gear to move axially toward the inner gear ring to eliminate the meshing gap between the planetary gear and the inner gear ring; The variable tooth thickness self-backlash eliminating planetary reducer further comprises a second backlash eliminating mechanism which automatically pushes the sun gear to move axially toward the planet gear to eliminate the meshing clearance between the sun gear and the planet gear.
2. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 1, characterized in that: The first backlash eliminating mechanism includes an axial thrust spring and a planar thrust bearing passing through the planetary gear shaft, and the planar thrust bearing is located between the end face of the planetary gear and the axial thrust spring.
3. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 2, characterized in that: The axial thrust spring passing through the planetary gear shaft is a disc spring.
4. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 2, characterized in that: The first anti-backlash mechanism further includes a washer arranged between the end of the axial thrust spring and the planet carrier.
5. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 4, characterized in that: The first backlash eliminating mechanism further includes a pre-tightening screw provided on the planet carrier for adjusting the position of the gasket.
6. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 1, characterized in that: The second backlash eliminating mechanism includes a rolling bearing connecting the sun gear and the planet carrier, a spring seat arranged on the planet carrier, and an axial thrust spring arranged between the spring seat and the rolling bearing to apply thrust to the outer ring of the rolling bearing.
7. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 6, characterized in that: The axial thrust spring provided between the spring seat and the rolling bearing and applying thrust to the outer ring of the rolling bearing is a disc spring.
8. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 6, characterized in that: The spring seat is a retaining ring or a nut.
9. The variable tooth thickness self-backlash eliminating planetary reducer according to claim 1, characterized in that: The variable tooth thickness teeth of the inner gear ring, sun gear and planetary gear are straight teeth or helical teeth.