Planetary gear mechanism and gear box
By setting an oil reservoir on the outside of the planetary gear shaft hole and increasing the number of secondary planetary gear sets, the problem of lubricating oil evaporation in the planetary gearbox was solved, thereby improving the lubrication effect and extending the service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG YIZUAN TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-06-05
AI Technical Summary
When planetary gears rotate at high speed in a planetary gearbox, the lubricating oil evaporates, leading to a decrease in lubrication effect, increased friction and temperature, and affecting service life.
Multiple oil reservoirs are installed on the outside of the planetary gear shaft hole to store lubricant, increasing the number of secondary planetary gear sets, and oil baffles and oil caps are installed at the arc groove to reduce lubricant leakage.
By supplementing lubrication with lubricant, friction and heat are reduced, extending the service life of the planetary gearbox, reducing oil leakage, and improving lubrication performance.
Smart Images
Figure CN224326638U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gearbox technology, and more specifically, to a planetary gear mechanism and a gearbox. Background Technology
[0002] Inside the planetary gearbox, planetary gears are mounted on the shaft of the planet carrier. The planetary gears can rotate on the shaft. At the same time, the outer teeth of the planetary gears mesh with the central gear and the outer internal gear ring. When the planetary gearbox is working, the planetary gears rotate at high speed on the shaft. The friction between the planetary gears and the shaft causes the lubricating oil on the planetary gears to evaporate, reducing the lubrication effect. This leads to the planetary gears not running smoothly and reduces their service life.
[0003] Therefore, a new solution is needed to address the above problems. Utility Model Content
[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a planetary gear mechanism and gearbox.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A planetary gear mechanism includes a housing and a first-stage planetary gearbox, a second-stage planetary gearbox, and a third-stage planetary gearbox installed within the housing. The first-stage planetary gearbox includes a first-stage planetary carrier and three sets of first-stage planetary gears. The three sets of first-stage planetary gears are circumferentially disposed on the upper surface of the first-stage planetary carrier and rotatably connected to three sets of first-stage gear shafts on the upper surface of the first-stage planetary carrier. The second-stage planetary gearbox includes a second-stage planetary carrier and five sets of second-stage planetary gears. The five sets of second-stage planetary gears are circumferentially disposed on the upper surface of the second-stage planetary carrier and rotatably connected to five sets of second-stage gear shafts on the upper surface of the second-stage planetary carrier. The third-stage planetary gearbox includes a third-stage planetary carrier and three sets of third-stage planetary gears. The three sets of third-stage planetary gears are circumferentially disposed on the upper surface of the third-stage planetary carrier and rotatably connected to three sets of third-stage gear shafts on the upper surface of the third-stage planetary carrier. Each of the first-stage, second-stage, and third-stage planetary gears has a vertically formed shaft hole in its center. Multiple oil reservoirs are vertically formed circumferentially on the outer side of each shaft hole, and the oil reservoirs communicate with the shaft hole.
[0007] Furthermore, the first-stage planetary transmission also includes a first-stage internal gear ring and a first-stage central gear; the second-stage planetary transmission also includes a second-stage internal gear ring and a second-stage central gear; and the third-stage planetary transmission also includes a third-stage internal gear ring. Three sets of the first-stage planetary gears are located within the first-stage internal gear ring and mesh with it. The first-stage central gear is located on the lower surface of the first-stage planetary carrier. The first-stage central gear and the first-stage planetary carrier are integrated and coaxially arranged. The first-stage central gear simultaneously meshes with five sets of second-stage planetary gears. The first-stage planetary carrier, the five sets of second-stage planetary gears, and the first-stage central gear are all located within the second-stage internal gear ring. By moving the second-stage internal gear ring along its axial direction, the second-stage internal gear ring switches between simultaneously meshing with the first-stage planetary carrier and the second-stage planetary gears and meshing with the second-stage planetary gears individually. The second-stage central gear is located on the lower surface of the second-stage planetary carrier. The second-stage central gear and the second-stage planetary carrier are integrated and coaxially arranged. The second-stage central gear simultaneously meshes with three sets of third-stage planetary gears. The three sets of third-stage planetary gears are located within the third-stage internal gear ring and mesh with it. The third-stage planetary carrier portion is located within the third-stage internal gear ring.
[0008] Furthermore, the primary internal gear ring is equipped with a motor gear, which simultaneously meshes with three sets of primary planetary gears.
[0009] Furthermore, the motor gear has 13 teeth, the first-stage planetary gear has 15 teeth, the first-stage internal gear ring has 44 teeth, the first-stage center gear has 15 teeth, the second-stage internal gear ring has 40 teeth, the second-stage planetary gear has 12 teeth, the second-stage center gear has 13 teeth, the third-stage internal gear ring has 44 teeth, and the third-stage planetary gear has 15 teeth.
[0010] Furthermore, the housing is symmetrically provided with arc-shaped grooves on both sides, and the housing is rotatably connected with a U-shaped lever. The two free ends of the lever pass through the arc-shaped grooves and are engaged with the grooves on the outer surface of the secondary internal gear ring.
[0011] Furthermore, the arc-shaped groove cover is provided with an oil baffle, and an oil baffle cap is installed on the oil baffle.
[0012] This utility model also provides a gearbox, including an output shaft, a connecting block, and the aforementioned planetary gear mechanism. The connecting block is installed at one end of the output shaft, and a slot is provided on the upper surface of the connecting block. A locking block is provided on the lower surface of the third-stage planetary carrier. The locking block is integrated with the third-stage planetary carrier and is engaged with the slot.
[0013] The beneficial effects of this utility model are:
[0014] 1. In this invention, multiple oil storage grooves are provided on the outer side of the shaft holes of each planetary gear. These grooves store lubricant. During gearbox operation, the lubricant in contact with the gear shaft is replenished onto the gear shaft, lubricating the rotation of the planetary gears, reducing friction between the planetary gears and the gear shaft, thereby reducing wear and heat generated by friction, lowering the maximum operating temperature of the planetary gearbox, and improving its service life. Furthermore, the multiple vertically arranged oil storage grooves increase the amount of lubricant stored and ensure that the contact surfaces between the gear shaft and the planetary gears are coated with lubricant, improving the lubrication effect.
[0015] 2. In this utility model, by increasing the number of secondary planetary gears from three to five, the stress on each secondary planetary gear during use is reduced, thereby preventing the secondary planetary gears from breaking.
[0016] 3. In this utility model, by setting an oil baffle and an oil baffle cover at the arc groove, the leakage of lubricant through the arc groove can be avoided or reduced, thereby improving the oil leakage phenomenon of the gearbox. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of one structure of the planetary gear mechanism in this embodiment;
[0018] Figure 2 This is a cross-sectional view of the planetary gear mechanism in this embodiment;
[0019] Figure 3 This is a schematic diagram of one structure of the first-stage planetary gearbox in this embodiment;
[0020] Figure 4 This is a schematic diagram of one structure of the first-stage planetary gear in this embodiment;
[0021] Figure 5 This is a schematic diagram of one structure of the primary planetary carrier in this embodiment;
[0022] Figure 6 This is a schematic diagram of one structure of the arc-shaped groove in this embodiment;
[0023] Figure 7 This is a schematic diagram of one structure of the lever in this embodiment;
[0024] Figure 8 This is a schematic diagram of a two-stage planetary gearbox in this embodiment;
[0025] Figure 9 This is a schematic diagram of one structure of the second-stage planetary gear in this embodiment;
[0026] Figure 10 This is a schematic diagram of one structure of the secondary planetary carrier in this embodiment;
[0027] Figure 11 This is a schematic diagram of a connection structure between the secondary internal gear ring and the baffle in this embodiment;
[0028] Figure 12 This is a schematic diagram of a three-stage planetary gearbox in this embodiment;
[0029] Figure 13 This is a schematic diagram of one structure of the three-stage planetary carrier in this embodiment;
[0030] Figure 14 This is a schematic diagram of a connection structure between the connecting block and the output shaft in this embodiment.
[0031] Reference numerals: 1. Housing; 101. Mounting post; 2. First-stage planetary gearbox; 21. First-stage planetary carrier; 22. First-stage planetary gear; 22. Shaft hole; 221. Oil reservoir; 222. First-stage gear shaft; 23. First-stage internal gear ring; 24. First-stage center gear; 25. Second-stage planetary gearbox; 31. Second-stage planetary carrier; 32. Second-stage planetary gear; 33. Second-stage gear shaft; 34. Second-stage internal gear ring; 341. Limiting block; 35. Second-stage center gear; 4. Third-stage planetary gearbox; 41. Third-stage planetary carrier; 411. Locking block; 42. Third-stage planetary gear; 43. Third-stage gear shaft; 44. Third-stage internal gear ring; 5. Motor gear; 6. Arc groove; 7. Lever; 701. Ring; 8. Groove; 9. Oil baffle; 10. Oil cover; 11. Output shaft; 12. Connecting block; 121. Slot; 13. Baffle; 131. Limiting groove. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] Example: A planetary gear mechanism, such as Figures 1-13As shown, the system includes a housing 1 and a first-stage planetary transmission 2, a second-stage planetary transmission 3, and a third-stage planetary transmission 4, which are installed inside the housing 1 and coaxially arranged. The first-stage planetary transmission 2 includes a first-stage planet carrier 21 and three sets of first-stage planetary gears 22. The three sets of first-stage planetary gears 22 are circumferentially arranged on the upper surface of the first-stage planet carrier 21 and are rotatably connected to three sets of first-stage gear shafts 23 on the upper surface of the first-stage planet carrier 21. The second-stage planetary transmission 3 is located below the first-stage planetary transmission 2. The second-stage planetary transmission 3 includes a second-stage planet carrier 31 and five sets of second-stage planetary gears 32. The five sets of second-stage planetary gears 32 are circumferentially arranged on the upper surface of the second-stage planet carrier 31 and are rotatably connected to five sets of second-stage gear shafts 33 on the upper surface of the second-stage planet carrier 31. The third-stage planetary transmission 4 is located below the second-stage planetary transmission 3. The third-stage planetary transmission 4 includes a third-stage planet carrier 41 and three sets of third-stage planetary gears 42. The three sets of third-stage planetary gears 42 are circumferentially arranged on the upper surface of the third-stage planet carrier 41 and are rotatably connected to three sets of third-stage gear shafts 43 on the upper surface of the third-stage planet carrier 41.
[0034] When the gearbox is in low speed, it mainly relies on the secondary planetary gear 32 for transmission. By increasing the number of secondary planetary gears 32 from three to five, the stress on each secondary planetary gear 32 during use is reduced, thereby preventing the secondary planetary gear 32 from breaking.
[0035] Furthermore, such as Figure 4 and Figure 9 As shown, the first-stage planetary gear 22, the second-stage planetary gear 32, and the third-stage planetary gear 42 all have vertically formed shaft holes 221 in their middle sections, which are adapted to their corresponding gear shafts. Specifically, the first-stage planetary gear 22 is mounted on the first-stage gear shaft 23 through the shaft holes 221 and can rotate at high speed on the first-stage gear shaft 23; the second-stage planetary gear 32 is mounted on the second-stage gear shaft 33 through the shaft holes 221 and can rotate at high speed on the second-stage gear shaft 33; and the third-stage planetary gear 42 is mounted on the third-stage gear shaft 43 through the shaft holes 221 and can rotate at high speed on the third-stage gear shaft 43. Multiple oil storage grooves 222 are vertically formed circumferentially on the outer sides of the shaft holes 221 of the first-stage planetary gear 22, the second-stage planetary gear 32, and the third-stage planetary gear 42, and these oil storage grooves 222 are connected to the shaft holes 221.
[0036] By providing multiple oil reservoirs 222 on the outer side of the shaft hole 221, before installing each planetary gear on its corresponding planetary carrier, a solid lubricant is first applied to the oil reservoir 222. Then, the planetary gear is installed on the gear shaft of the planetary carrier. During the operation of the planetary gearbox, the lubricant in contact with the gear shaft liquefies at high temperature and replenishes the gear shaft, thus lubricating the rotation of the planetary gear, reducing the friction between the planetary gear and the gear shaft, thereby reducing wear and heat generated by friction, lowering the maximum operating temperature of the planetary gearbox, and improving the service life of the planetary gearbox.
[0037] By setting multiple oil storage tanks 222 vertically, the amount of lubricant stored can be increased, and the contact surfaces of the gear shaft and planetary gears can be coated with lubricant, thus improving the lubrication effect. The lubricant is solid at room temperature and liquid at high temperature.
[0038] Furthermore, the first-stage planetary transmission 2 also includes a first-stage internal gear ring 24 and a first-stage central gear 25; the second-stage planetary transmission 3 also includes a second-stage internal gear ring 34 and a second-stage central gear 35; and the third-stage planetary transmission 4 also includes a third-stage internal gear ring 44. Three sets of first-stage planetary gears 22 are located within the first-stage internal gear ring 24 and mesh with it. The first-stage central gear 25 is located on the lower surface of the first-stage planetary carrier 21. The first-stage central gear 25 and the first-stage planetary carrier 21 are integrated and coaxially arranged. The first-stage central gear 25 is located within the area enclosed by five sets of second-stage planetary gears 32 and simultaneously meshes with all five sets of second-stage planetary gears 32. The first-stage planetary carrier 21, the five sets of second-stage planetary gears 32, and the first-stage... The central gears 25 are all located within the secondary internal gear ring 34. By moving the secondary internal gear ring 34 along its axial direction, the secondary internal gear ring 34 switches between simultaneously meshing with the primary planet carrier 21 and the secondary planet gear 32 and meshing with the secondary planet gear 32 alone. The secondary central gear 35 is located on the lower surface of the secondary planet carrier 31. The secondary central gear 35 and the secondary planet carrier 31 are integrated and coaxially arranged. The secondary central gear 35 is located within the area enclosed by three sets of tertiary planet gears 42 and simultaneously meshes with the three sets of tertiary planet gears 42. The three sets of tertiary planet gears 42 are located within the tertiary internal gear ring 44 and respectively mesh with the tertiary internal gear ring 44. The tertiary planet carrier 41 is partially located within the tertiary internal gear ring 44.
[0039] When the planetary gear mechanism is running, the gearbox switches between low-speed and high-speed output by changing the axial position of the secondary internal gear ring 34. That is, when the secondary internal gear ring 34 is simultaneously meshing with the primary planet carrier 21 and the secondary planetary gear 32, the gearbox outputs at high speed. When the secondary internal gear ring 34 moves downward along its axial direction, the secondary internal gear ring 34 disengages from the primary planet carrier 21 and remains meshed with the secondary planetary gear 32, and the gearbox outputs at low speed.
[0040] As a preferred option, such as Figure 2 and Figure 11 As shown, a baffle 13 is provided below the secondary planetary carrier 31 to limit the downward stroke of the secondary internal gear ring 34. When the lower end of the secondary internal gear ring 34 abuts against the upper surface of the baffle 13, the limiting block 341 located at the bottom of the secondary internal gear ring 34 inserts into the limiting groove 131 located on the upper surface of the baffle 13. The limiting groove 131 and the limiting block 341 cooperate to limit the movement of the secondary internal gear ring 34. It should be noted that the length of the limiting groove 131 is greater than the length of the limiting block 341 to ensure that the limiting block 341 can be inserted into the limiting groove 131.
[0041] Furthermore, such as Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, the housing 1 has symmetrical arc-shaped grooves 6 on both sides. The housing 1 is rotatably connected to a U-shaped lever 7. The two free ends of the lever 7 pass through the arc-shaped grooves 6 and are engaged with the grooves 8 on the outer surface of the secondary internal gear ring 34. By setting the lever 7, the secondary internal gear ring 34 is driven to move up and down by moving the lever 7, so as to switch between simultaneously meshing the primary planetary carrier 21 and the secondary planetary gear 32 and meshing the secondary planetary gear 32 alone.
[0042] Preferably, mounting posts 101 are provided on both sides of the housing 1 corresponding to the arc-shaped grooves 6. The two free ends of the lever 7 are provided with rings 701 that are adapted to the mounting posts 101. The lever 7 is connected to the housing 1 through the rings 701 sleeved on the mounting posts 101. The rings 701 can rotate on the mounting posts 101, that is, the lever 7 can rotate around the mounting posts 101 as the axis, and the rotation of the lever 7 drives the secondary internal gear ring 34 to move up and down.
[0043] Furthermore, since arc-shaped grooves 6 connected to the inner cavity of the housing 1 are provided on both sides of the housing 1, the lubricant will leak out from the arc-shaped grooves 6 when the planetary gear mechanism is running; in order to avoid or reduce the leakage of lubricant outward through the arc-shaped grooves 6, an oil baffle 9 is provided at the arc-shaped grooves 6, the oil baffle 9 covers the arc-shaped grooves 6, and an oil baffle cap 10 is installed on the oil baffle 9.
[0044] Furthermore, a motor gear 5 is provided inside the first-stage internal gear ring 24. The motor gear 5 is located within the area enclosed by the three sets of first-stage planetary gears 22, and the motor gear 5 simultaneously meshes with the three sets of first-stage planetary gears 22. In use, the motor gear 5 is connected to the output shaft 11 of the motor, and the motor gear 5 drives the first-stage planetary gears 22 to rotate, thereby driving the first-stage planetary carrier 21 to rotate.
[0045] Furthermore, the motor gear 5 has 13 teeth, the first-stage planetary gear 22 has 15 teeth, the first-stage internal gear ring 24 has 44 teeth, the first-stage center gear 25 has 15 teeth, the second-stage internal gear ring 34 has 40 teeth, the second-stage planetary gear 32 has 12 teeth, the second-stage center gear 35 has 13 teeth, the third-stage internal gear ring 44 has 44 teeth, and the third-stage planetary gear 42 has 15 teeth. By limiting the number of teeth on each gear and the internal gear ring, the gearbox has a speed ratio of 1:70.49 in the low-speed gear and a speed ratio of 1:19.2 in the high-speed gear, which increases the output force of the gearbox and improves efficiency under high torque.
[0046] This embodiment also provides a gearbox, such as Figure 1 , Figure 2 , Figure 13 and Figure 14 As shown, the assembly includes an output shaft 11, a connecting block 12, and the aforementioned planetary gear mechanism. The connecting block 12 is mounted on one end of the output shaft 11. A slot 121 is formed on the upper surface of the connecting block 12, and a locking block 411 is formed on the lower surface of the third-stage planetary carrier 41. The locking block 411 is integrated with the third-stage planetary carrier 41 and engages with the slot 121, thus fixing the third-stage planetary carrier 41 to the connecting block 12. When the third-stage planetary carrier 41 rotates, the engaging action of the locking block 411 and the slot 121 drives the connecting block 12 to rotate, and the rotation of the connecting block 12 drives the output shaft 11 to rotate.
[0047] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A planetary gear mechanism, comprising a housing (1), and a first-stage planetary gearbox (2), a second-stage planetary gearbox (3), and a third-stage planetary gearbox (4) mounted within the housing (1), characterized in that, The first-stage planetary gearbox (2) includes a first-stage planetary carrier (21) and three sets of first-stage planetary gears (22). The three sets of first-stage planetary gears (22) are circumferentially arranged on the upper surface of the first-stage planetary carrier (21) and are rotatably connected to three sets of first-stage gear shafts (23) on the upper surface of the first-stage planetary carrier (21). The second-stage planetary gearbox (3) includes a second-stage planetary carrier (31) and five sets of second-stage planetary gears (32). The five sets of second-stage planetary gears (32) are circumferentially arranged on the upper surface of the second-stage planetary carrier (31) and are rotatably connected to five sets of second-stage gear shafts (33) on the upper surface of the second-stage planetary carrier (31). The three-stage planetary transmission (4) includes a three-stage planetary carrier (41) and three sets of three-stage planetary gears (42). The three sets of three-stage planetary gears (42) are circumferentially arranged on the upper surface of the three-stage planetary carrier (41) and are rotatably connected to three sets of three-stage gear shafts (43) on the upper surface of the three-stage planetary carrier (41). The middle of the first-stage planetary gear (22), the second-stage planetary gear (32) and the third-stage planetary gear (42) are all vertically provided with shaft holes (221). Multiple oil storage grooves (222) are vertically provided on the outer circumferential side of the shaft holes (221). The oil storage grooves (222) are connected to the shaft holes (221).
2. The planetary gear mechanism according to claim 1, characterized in that, The first-stage planetary gearbox (2) further includes a first-stage internal gear ring (24) and a first-stage center gear (25). The second-stage planetary gearbox (3) further includes a second-stage internal gear ring (34) and a second-stage center gear (35). The third-stage planetary gearbox (4) further includes a third-stage internal gear ring (44). Three sets of first-stage planetary gears (22) are located inside the first-stage internal gear ring (24) and mesh with the first-stage internal gear ring (24) respectively. The first-stage center gear (25) is located on the lower surface of the first-stage planetary carrier (21). The first-stage center gear (25) and the first-stage planetary carrier (21) are integrated and coaxially arranged. The first-stage center gear (25) simultaneously meshes with five sets of second-stage planetary gears (32). The first-stage planetary carrier (21), the five sets of second-stage planetary gears (32), and The primary center gear (25) is located within the secondary internal gear ring (34). By moving the secondary internal gear ring (34) along its axial direction, the secondary internal gear ring (34) switches between simultaneously meshing with the primary planet carrier (21) and the secondary planet gear (32) and meshing with the secondary planet gear (32) alone. The secondary center gear (35) is located on the lower surface of the secondary planet carrier (31). The secondary center gear (35) and the secondary planet carrier (31) are connected as one unit and coaxially arranged. The secondary center gear (35) simultaneously meshes with three sets of tertiary planet gears (42). The three sets of tertiary planet gears (42) are located within the tertiary internal gear ring (44) and mesh with the tertiary internal gear ring (44) respectively. The tertiary planet carrier (41) is partially located within the tertiary internal gear ring (44).
3. A planetary gear mechanism according to claim 2, characterized in that, The primary internal gear ring (24) is equipped with a motor gear (5), which simultaneously meshes with three sets of primary planetary gears (22).
4. A planetary gear mechanism according to claim 3, characterized in that, The motor gear (5) has 13 teeth, the first-stage planetary gear (22) has 15 teeth, the first-stage internal gear ring (24) has 44 teeth, the first-stage center gear (25) has 15 teeth, the second-stage internal gear ring (34) has 40 teeth, the second-stage planetary gear (32) has 12 teeth, the second-stage center gear (35) has 13 teeth, the third-stage internal gear ring (44) has 44 teeth, and the third-stage planetary gear (42) has 15 teeth.
5. A planetary gear mechanism according to claim 2, characterized in that, The housing (1) has symmetrical arc grooves (6) on both sides. The housing (1) is rotatably connected to a U-shaped lever (7). The two free ends of the lever (7) pass through the arc grooves (6) and are engaged in the grooves (8) on the outer surface of the secondary internal gear ring (34).
6. A planetary gear mechanism according to claim 5, characterized in that, The arc-shaped groove (6) is covered with an oil baffle (9), and an oil baffle cap (10) is installed on the oil baffle (9).
7. A gearbox, characterized in that, The device includes an output shaft (11), a connecting block (12), and a planetary gear mechanism as described in any one of claims 1-6. The connecting block (12) is installed at one end of the output shaft (11). A slot (121) is provided on the upper surface of the connecting block (12). A locking block (411) is provided on the lower surface of the third-stage planetary carrier (41). The locking block (411) is integrated with the third-stage planetary carrier (41) and is engaged in the slot (121).