High-speed planetary transmission mechanism

Abstract

The invention belongs to the technical field of large-speed-ratio and high-power application, and particularly relates to a high-speed planetary transmission mechanism which comprises a box body, a low-speed shaft and a high-speed shaft which rotate through an axis are arranged at the two ends of the box body respectively, and a planetary transmission assembly connected with the low-speed shaft and the high-speed shaft is arranged in the box body. The planetary transmission assembly comprises a first planet wheel and a second planet wheel which are in duplex connection, the first planet wheel is installed on the periphery of the second planet wheel in an interference fit mode, and a first transmission mechanism and a second transmission mechanism which are used for power connection are arranged between the two ends of the second planet wheel and the ends of the low-speed shaft and the high-speed shaft respectively. According to the high-speed planetary transmission mechanism, the first planet gear and the second planet gear which are in duplex connection are arranged, the speed increasing ratio of the high-speed planetary transmission mechanism can be increased, a high-speed shaft can reach a higher rotating speed, the diameter of the thin-wall inner gear ring can be reduced, the linear speed of the floating thin-wall inner gear ring can be reduced, and vibration and running noise can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of high speed ratio and high power applications, and particularly relates to a high speed planetary transmission mechanism. Background Art

[0002] Most of the current planetary transmission mechanisms use rolling bearings. Constrained by the rotational speed and load-bearing capacity of the rolling bearings themselves, the current traditional planetary transmission mechanisms can no longer meet the industry requirements of high rotational speed and high power.

[0003] Technical Difficulties to be Solved

[0004] (1) Equal load design: Poor equal load of the planetary structure will cause uneven load on the gears and bearings, resulting in their damage.

[0005] (2) Vibration and noise problems caused by high linear velocity operation of the floating sun gear and thin-walled internal gear ring, and vibration and noise problems caused by the crosstalk of the planetary gears.

[0006] (3) Ordinary bearings can no longer meet its high speed and high power operation.

[0007] (4) Lubrication problem of the high rotational speed operation of the sun gear and the internal gear sleeve.

[0008] (5) General lubrication flow rate can no longer meet the lubrication and heat dissipation requirements of the bearings, nor can it meet the meshing lubrication and heat dissipation of the gears, and the heat dissipation of the gear windage heat.

[0009] (6) The series oil passage cannot meet the demand for large flow of lubricating oil in the high speed planetary transmission mechanism.

[0010] (7) High rotational speed and large flow rate of the sliding bearings are likely to cause the risk of oil leakage in the high speed planetary transmission mechanism.

[0011] (8) Synchronization problem after the flow division of the double-connected gear planetary gear 1 and planetary gear 2. Summary of the Invention

[0012] The purpose of the present invention is to provide a high speed planetary transmission mechanism to solve the problems raised in the above background art.

[0013] To achieve the above purpose, the present invention provides the following technical solution: A high speed planetary transmission mechanism, comprising: a box body, both ends of the box body are respectively provided with a low speed shaft and a high speed shaft that rotate through the axis, a planetary transmission assembly for connecting the low speed shaft and the high speed shaft is provided in the box body, the planetary transmission assembly includes a double-connected first planetary gear and second planetary gear, the first planetary gear is installed on the outer periphery of the second planetary gear by interference fit, the second planetary gear is rotatably installed in the box body, and a first transmission mechanism and a second transmission mechanism for power connection are respectively provided between both ends of the second planetary gear and the ends of the low speed shaft and the high speed shaft.

[0014] Preferably, a planet carrier is fixed in the box body by a pin. At both ends of the second planet gear, a first planet gear radial thrust bearing and a second planet gear radial thrust bearing installed on the planet carrier are respectively provided. A sealing pressing plate is further provided on the planet carrier. A oil distributor for lubricating and supplying oil to the low-speed shaft and the high-speed shaft in parallel is provided between the sealing pressing plate and the planet carrier. A oil supply channel for oil supply is provided at the top of the oil distributor.

[0015] Preferably, the box body sequentially includes an upper box body and a lower box body from top to bottom. Low-speed seals and high-speed seals for rotating lubrication of the low-speed shaft and the high-speed shaft are respectively provided between both ends of the upper box body and the lower box body. A front box body is covered outside the high-speed seal. One end of the high-speed shaft extends to the outside of the front box body. High-speed bearing oil pipe systems are connected between both the low-speed seal and the high-speed seal and the oil distributor.

[0016] Preferably, the first transmission mechanism includes a sun gear and an internal gear sleeve. The sun gear is arranged on the axis line between the upper box body and the lower box body. The internal gear sleeve is meshingly installed between the high-speed shaft and the sun gear. The sun gear meshes with the first planet gear. A third oil injection pipe communicated with the oil distributor is further installed on the planet carrier. The third oil injection pipe is used for injecting oil for lubrication at the meshing part between the first planet gear and the sun gear.

[0017] Preferably, a first oil injection pipe communicated with the oil distributor is further provided on the planet carrier. A shaft hole for the first oil injection pipe to pass through is penetrated on the axis line of the sun gear. And one end of the first oil injection pipe extends to the meshing part between the sun gear, the internal gear sleeve and the high-speed shaft.

[0018] Preferably, the teeth of the sun gear are herringbone-shaped.

[0019] Preferably, the second transmission mechanism includes a toothed connecting plate and an internal gear ring. The toothed connecting plate is installed on the low-speed shaft and is arranged inside the upper box body and the lower box body. The internal gear ring is shunt-driven between the toothed connecting plate and the second planet gear. A second oil injection pipe communicated with the oil distributor is further installed on the planet carrier. One end of the second oil injection pipe is used for injecting oil for lubrication at the meshing part between the internal gear ring and the second planet gear.

[0020] Preferably, a through hole extending to the oil distributor is axially penetrated on the second planet gear. A sealing cover for blocking the through hole is provided at one end of the second planet gear departing from the separator. The through hole is used for supplying oil to the end faces of the first planet gear radial thrust bearing and the second planet gear radial thrust bearing.

[0021] Preferably, a first low-speed bearing and a second low-speed bearing are successively arranged from outside to inside in the low-speed seal, and one end of the low-speed shaft penetrates and is arranged between the first low-speed bearing and the second low-speed bearing.

[0022] Preferably, a first high-speed bearing and a second high-speed bearing are successively arranged from outside to inside in the high-speed seal, and one end of the high-speed shaft penetrates and is arranged between the first low-speed bearing and the second high-speed bearing.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention is provided with a double-connected first planet gear and second planet gear, which can not only expand the speed increase ratio of the high-speed planetary transmission mechanism, so that the high-speed shaft reaches a higher speed, but also reduce the diameter of the thin-walled internal gear ring, reduce the linear speed of the floating thin-walled internal gear ring, and reduce vibration and running noise.

[0025] (2) The present invention is provided with an oil distributor, and an independent parallel lubricating oil passage is adopted to meet the demand for a large flow of lubricating oil of the high-speed planetary transmission mechanism. A large ring groove is machined on the planet carrier and sealed with a sealing pressing plate to form an oil distributor. An oil inlet is opened at the top and communicates with the ring groove for oil inlet. The ring groove can function as an oil storage and an oil distributor to realize a parallel oil passage.

[0026] (3) The present invention is provided with a low-speed seal and a high-speed seal. The high-speed seal and the low-speed seal of the high-speed shaft and the low-speed shaft both adopt a mechanical seal with a small gap and oil blocking in both the axial and radial directions, so as to solve the oil leakage risk during the operation of the high-speed planetary transmission mechanism.

[0027] (4) The present invention is provided with a herringbone sun gear. The sun gear adopts a herringbone tooth form, which can not only meet the floating requirement of the sun gear, but also utilize the automatic centering function of the herringbone tooth to reduce the influence on vibration and noise after high-speed rotation.

[0028] (5) The present invention is provided with a first planet gear radial thrust bearing and a second planet gear radial thrust bearing. The planet carrier is fixed on the box body, and both ends of the planet gear are positioned by thrust bearings. The fixed-axis transmission method is adopted to eliminate the vibration and noise problems caused by the crosstalk of the planet gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the present invention;

[0030] Figure 2 is a perspective view of the sun gear and the first oil injection pipe of the present invention;

[0031] Figure 3 is a partial perspective view of the second oil injection pipe, the third oil injection pipe and the planet carrier of the present invention;

[0032] In the figure: 1. Low-speed shaft; 2. First low-speed bearing; 3. Tooth type connecting plate; 4. Sealing cover; 5. Internal gear ring; 6. Upper box body; 7. First planetary gear radial thrust bearing; 8. First planetary gear; 9. Planet carrier; 10. Second planetary gear radial thrust bearing; 11. Second planetary gear; 12. Sealing pressing plate; 13. High-speed bearing oil inlet pipe system; 14. High-speed shaft; 15. High-speed seal; 16. First high-speed bearing; 17. Second high-speed bearing; 18. Front box body; 19. Internal gear sleeve; 20. Sun gear; 21. Low-speed seal; 22. Second low-speed bearing; 23. First oil injection pipe; 24. Second oil injection pipe; 25. Third oil injection pipe; 26. Lower box body. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Refer to Figure 1 As shown, a high-speed planetary transmission mechanism provided by the present invention includes: a box body, a low-speed shaft 1 and a high-speed shaft 14 that rotate coaxially are respectively arranged at both ends of the box body, and a planetary transmission assembly for connecting the low-speed shaft 1 and the high-speed shaft 14 is arranged in the box body. The planetary transmission assembly includes a double-connected first planetary gear 8 and a second planetary gear 11. The first planetary gear 8 is installed on the outer periphery of the second planetary gear 11 by interference fit. The second planetary gear 11 is rotatably installed in the box body. A first transmission mechanism and a second transmission mechanism for power connection are respectively arranged between the two ends of the second planetary gear 11 and the ends of the low-speed shaft 1 and the high-speed shaft 14.

[0035] Combined with Figure 1 As shown, the first transmission mechanism includes a sun gear 20 and an internal gear sleeve 19. The sun gear 20 is arranged on the axis between the upper box body 6 and the lower box body 26. The internal gear sleeve 19 is meshingly installed between the high-speed shaft 14 and the sun gear 20. The sun gear 20 meshes with the first planetary gear 8.

[0036] Combined with Figure 1 As shown, the second transmission mechanism includes a tooth type connecting plate 3 and an internal gear ring 5. The tooth type connecting plate 3 is installed on the low-speed shaft 1, and the tooth type connecting plate 3 is arranged inside the upper box body 6 and the lower box body 26. The internal gear ring 5 is installed between the tooth type connecting plate 3 and the second planetary gear 11 in a split drive manner.

[0037] As described above, when using the box body, low-speed shaft 1, high-speed shaft 14 and planetary transmission assembly provided by the present invention, the appropriate thickness of the thin-walled internal gear ring 5 not only meets the torque transmission capacity, but also realizes the radial and axial double floating of the thin-walled internal gear ring 5 due to torsional deformation during operation. The sun gear 20 is separated from the high-speed shaft 14 and connected through the internal gear sleeve 19. The external gear drum repaired in cooperation with the internal gear sleeve 19 can realize the radial and axial double floating of the sun gear 20 to solve the equal load problem of gear shunt.

[0038] Further, in order to reduce the vibration of the sun gear 20 after high-speed rotation, refer to Figure 2 As shown, the teeth of the sun gear 20 are in a herringbone shape. The position of the sun gear 20 can be positioned through the herringbone teeth.

[0039] Further, in order to facilitate the rotational installation of the low-speed shaft 1 in the low-speed seal 21, refer to Figure 1 As shown, a first low-speed bearing 2 and a second low-speed bearing 22 are sequentially arranged from the outside to the inside in the low-speed seal 21, and one end of the low-speed shaft 1 penetrates and is arranged between the first low-speed bearing 2 and the second low-speed bearing 22.

[0040] Further, in order to facilitate the rotational installation of the high-speed shaft 14 in the high-speed seal 15, refer to Figure 1 As shown, a first high-speed bearing 16 and a second high-speed bearing 17 are sequentially arranged from the outside to the inside in the high-speed seal 15, and one end of the high-speed shaft 14 penetrates and is arranged between the first low-speed bearing 2 and the second high-speed bearing 17.

[0041] In summary, all bearings adopt sliding bearings, and the sliding bearings are customized bearings for high rotational speed and high power. Each bearing can be designed according to the set working conditions of the high-speed planetary transmission mechanism to meet the high rotational speed and high power operation of the high-speed planetary transmission mechanism.

[0042] In the present invention, as shown in combination with Figure 3 In the box body of this embodiment, the planetary carrier 9 is fixed by a pin. Radial thrust bearings 7 of the first planetary gear 8 and radial thrust bearings 10 of the second planetary gear 11 are respectively arranged at both ends of the second planetary gear 11 and are installed on the planetary carrier 9. A sealing pressing plate 12 is further arranged on the planetary carrier 9. An oil distributor for lubricating and supplying oil to the low-speed shaft 1 and the high-speed shaft 14 in parallel is arranged between the sealing pressing plate 12 and the planetary carrier 9. An oil supply channel for supplying oil is arranged at the top of the oil distributor.

[0043] Combined with Figure 1As shown, the box body successively includes an upper box body 6 and a lower box body 26 from top to bottom. Low-speed seals 21 and high-speed seals 15 for the rotation lubrication of the low-speed shaft 1 and the high-speed shaft 14 are respectively arranged between the two ends of the upper box body 6 and the lower box body 26. A front box body 18 is provided outside the high-speed seal 15. One end of the high-speed shaft 14 extends to the outside of the front box body 18. High-speed bearing inlet pipe systems 13 are connected between both the low-speed seal 21 and the high-speed seal 15 and the oil distributor.

[0044] As described above, when using the oil distributor provided by the present invention, after opening a through hole in the second planet gear 11, it communicates with the oil distributor for oil inlet. The tail of the radial thrust bearing 7 of the first planet gear 8 is sealed with a sealing cover 4 to avoid lubricating oil leakage. Both the radial thrust bearing 7 of the first planet gear 8 and the radial thrust bearing 10 of the second planet gear 11 adopt the method of end face oil inlet and oil discharge at the thrust bearing, that is, a stable oil film of the sliding bearing is established, and the lubricating oil quantity required for the radial and thrust of the sliding bearing is also ensured. When lubricating the bearing by radially opening a hole in the second planet gear 11, due to the rotation of the planet gear, the flow direction and flow rate of the lubricating oil are unstable, resulting in the problem of unstable oil film, and the stability during high-speed operation of the bearing is also improved.

[0045] Threads are drilled in the sealing pressing plate 12, and the high-speed bearing inlet pipe system 13 is installed. The high-speed bearing inlet pipe system 13 is then installed on the bearing seat of the front box body 18 to independently supply oil from the upper end of the stationary bearing seat, providing the required large amount of lubricating oil for the first high-speed bearing 16 and the second high-speed bearing 17, and also avoiding the instability of lubricating oil flow and oil film caused by the lubricating oil entering from the rotating part, as well as the risks of instability and oil shortage during high-speed operation of the bearing.

[0046] Further, in order to facilitate lubrication of the meshing part between the first planet gear 8 and the sun gear 20, referring to Figure 1 and Figure 3 As shown, a third spray oil pipe 25 communicating with the oil distributor is also installed on the planet carrier 9. The third spray oil pipe 25 is used for spray lubrication of the meshing part between the first planet gear 8 and the sun gear 20.

[0047] Further, in order to facilitate lubrication of the meshing part between the sun gear 20, the internal gear sleeve 19 and the high-speed shaft 14, referring to Figure 1-2As shown, a first oil spray pipe 23 communicating with the oil distributor is further provided on the planet carrier 9. A shaft hole for the first oil spray pipe 23 to pass through is penetrated on the axis of the sun gear 20, and one end of the first oil spray pipe 23 extends to the meshing part between the sun gear 20, the internal gear sleeve 19 and the high-speed shaft 14. An independent oil passage is machined on the reinforcing rib plate of the planet carrier 9 and communicated with the oil distributor, and an oil passage is machined on the low-speed shaft 1 and communicated with the independent oil passage to meet the high-flow requirements of the sliding bearings of the first low-speed bearing 2 and the second low-speed bearing 22. The first oil spray pipe 23 at the tail end of the low-speed shaft 1 passes through the central hole of the sun gear 20 to spray the meshing part of the sun gear 20, the high-speed shaft 14 and the internal gear sleeve 19, so as to meet the lubrication and cooling required for high-speed and high-power meshing.

[0048] Further, in order to facilitate the lubrication of the meshing part between the internal gear ring 5 and the second planet gear 11, referring to Figure 1 and Figure 3 As shown, a second oil spray pipe 24 communicating with the oil distributor is further installed on the planet carrier 9. One end of the second oil spray pipe 24 is used for oil spraying lubrication of the meshing part between the internal gear ring 5 and the second planet gear 11.

[0049] Further, in order to facilitate the end surface oil supply to the radial thrust bearing 7 of the first planet gear 8 and the radial thrust bearing 10 of the second planet gear 11, referring to Figure 1 As shown, a through hole extending to the oil distributor is axially penetrated on the second planet gear 11. A sealing cover 4 for blocking the through hole is provided at one end of the second planet gear 11 away from the separator. The through hole is used for end surface oil supply to the radial thrust bearing 7 of the first planet gear 8 and the radial thrust bearing 10 of the second planet gear 11.

[0050] In summary, an independent oil passage is machined on the additional reinforcing rib plate of the planet carrier 9 and communicated with the oil distributor. The second oil spray pipe 24 and the third oil spray pipe 25 are respectively installed to separately lubricate the meshing of the internal gear ring 5 and the second planet gear 11, and the meshing of the first planet gear 8 and the sun gear 20, so as to meet the lubrication and cooling required for high-speed and high-power meshing.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-speed planetary transmission mechanism, characterized in that: include: A housing, wherein two ends of the housing are respectively provided with a low-speed shaft (1) and a high-speed shaft (14) which rotate about the axis, and a planetary transmission assembly connecting the low-speed shaft (1) and the high-speed shaft (14) is provided in the housing, and the planetary transmission assembly comprises a first double planetary gear (8) and a second planetary gear (11), wherein the first planetary gear (8) is installed on the outer periphery of the second planetary gear (11) by interference fit, and the second planetary gear (11) is rotatably installed in the housing, and a first transmission mechanism and a second transmission mechanism for power connection are respectively provided between the two ends of the second planetary gear (11) and the ends of the low-speed shaft (1) and the high-speed shaft (14).

2. A high-speed planetary transmission mechanism according to claim 1, characterized in that: A planet carrier (9) is fixed in the housing by pins, and a first planetary gear radial thrust bearing (7) and a second planetary gear radial thrust bearing (10) mounted on the planet carrier (9) are respectively provided at both ends of the second planetary gear (11), and a sealing pressure plate (12) is also provided on the planetary gear (9), and an oil separator connected in parallel between the sealing pressure plate (12) and the planetary gear (9) for lubricating and supplying oil to the low-speed shaft (1) and the high-speed shaft (14) is provided, and an oil supply channel for supplying oil is provided on the top of the oil separator.

3. A high-speed planetary transmission mechanism according to claim 2, characterized in that: The housing comprises an upper housing (6) and a lower housing (26) from top to bottom. A low-speed seal (21) and a high-speed seal (15) for rotational lubrication of a low-speed shaft (1) and a high-speed shaft (14) are respectively arranged between the two ends of the upper housing (6) and the lower housing (26). The outer cover of the high-speed seal (15) is provided with a front housing (18). One end of the high-speed shaft (14) extends to the outside of the front housing (18). A high-speed bearing oil inlet pipe system (13) is connected between the low-speed seal (21) and the high-speed seal (15) and the oil separator.

4. A high-speed planetary transmission mechanism according to claim 2, characterized in that: The first transmission mechanism comprises a sun gear (20) and an inner gear sleeve (19), wherein the sun gear (20) is arranged on the axis line between the upper housing (6) and the lower housing (26), the inner gear sleeve (19) is meshingly mounted between the high-speed shaft (14) and the sun gear (20), the sun gear (20) is meshingly mounted with the first planetary gear (8), and a third oil injection pipe (25) connected to the oil distributor is also mounted on the planetary carrier (9), and the third oil injection pipe (25) is used for oil injection lubrication at the meshing point between the first planetary gear (8) and the sun gear (20).

5. A high-speed planetary transmission mechanism according to claim 4, characterized in that: The planet carrier (9) is also provided with a first oil injection pipe (23) connected to the oil distributor, and an axial hole for the first oil injection pipe (23) to pass through the axis of the sun gear (20), and one end of the first oil injection pipe (23) extends to the meshing position between the sun gear (20), the inner gear sleeve (19) and the high-speed shaft (14).

6. A high-speed planetary transmission mechanism according to claim 4, characterized in that: The teeth of the sun gear (20) are in a herringbone shape.

7. A high-speed planetary transmission mechanism according to claim 2, characterized in that: The second transmission mechanism comprises a geared connecting plate (3) and an inner gear ring (5); the geared connecting plate (3) is mounted on the low-speed shaft (1), and the geared connecting plate (3) is arranged on the inner side of the upper housing (6) and the lower housing (26); the inner gear ring (5) is installed between the geared connecting plate (3) and the second planetary gear (11) in a split-flow driving manner; a second oil injection pipe (24) connected to an oil distributor is also installed on the planetary carrier (9); one end of the second oil injection pipe (24) is used for oil injection lubrication at the meshing point between the inner gear ring (5) and the second planetary gear (11).

8. A high-speed planetary transmission mechanism according to claim 2, characterized in that: A through hole extending into the oil separator is axially penetrated through the second planetary gear (11); a sealing cover (4) for sealing the through hole is provided at one end of the second planetary gear (11) facing away from the separator; the through hole is used for end surface oil supply to the first planetary gear radial thrust bearing (7) and the second planetary gear radial thrust bearing (10).

9. A high-speed planetary transmission mechanism according to claim 3, characterized in that: The low-speed seal (21) is provided with a first low-speed bearing (2) and a second low-speed bearing (22) in sequence from the outside to the inside, and one end of the low-speed shaft (1) is arranged between the first low-speed bearing (2) and the second low-speed bearing (22).

10. A high-speed planetary transmission mechanism according to claim 3, characterized in that: The high-speed seal (15) is provided with a first high-speed bearing (16) and a second high-speed bearing (17) in sequence from the outside to the inside, and one end of the high-speed shaft (14) is arranged between the first low-speed bearing (2) and the second high-speed bearing (17).

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