Double-sun gear compound planetary array adapted to high-power planetary gear mechanism

Abstract

The application discloses a double-sun-wheel composite planetary array suitable for a high-power planetary gear mechanism, which comprises a control member CI, a large gear ring, a long planetary gear, a long planetary gear shaft, a planetary gear frame, a large sun wheel, a steel sheet, a friction plate, a brake support, a small sun wheel, a needle roller bearing I, a short planetary gear shaft, a needle roller bearing II, a short planetary gear, a main shaft, a connecting spline, a connecting bearing, a control member BI and a control member BII. The application has great progress significance for improving the power density of the planetary gear mechanism and reducing the volume of the planetary gear mechanism. The patent is suitable for high-power hydraulic machines and has important significance for the design and development of the planetary gear mechanism of the hydraulic machines.

Description

Technical Field

[0001] This invention belongs to the field of planetary transmission mechanism technology, and relates to a double sun gear composite planetary gear set adapted to high-power planetary transmission mechanism. It is mainly applied in the field of planetary transmission mechanism technology of hydraulic mechanical integrated transmission device. The planetary transmission mechanism of hydraulic mechanical integrated rotation device is the core component for realizing high-speed tracked mobility. Background Technology

[0002] Planetary transmission mechanisms are core components for high-speed tracked vehicles, enabling straight-line driving and acceleration. The planetary gear train is a crucial part of the planetary transmission mechanism, primarily responsible for power output. Planetary gear trains can be divided into simple planetary gear trains and compound planetary gear trains. The basic characteristic of a compound planetary gear train is that it consists of two rows of simple planetary gears sharing a common set of planetary gears and a planet carrier. Furthermore, the total number of sun gears and ring gears must be at least three, meaning the train has at least four central components. Compared to simple planetary gear transmission systems, compound planetary gear transmission systems are more compact, have a higher torque-to-mass ratio, more power transmission paths, and a wider range of transmission ratios. This invention designs a double-sun gear compound planetary gear train suitable for high-power hydraulic machinery. This compound gear train can effectively improve the power density of the integrated transmission device in hydraulic machinery, which is of great significance for improving the mobility of high-speed tracked vehicles. Summary of the Invention

[0003] (I) Purpose of the Invention

[0004] The purpose of this invention is to provide a double sun gear composite planetary gear set adapted to high-power planetary transmission mechanisms, so as to enable the hydraulic-mechanical integrated transmission device to transmit a large load in a limited space and improve the power density of the hydraulic-mechanical integrated transmission device.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, the present invention provides a double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism, comprising: an operating component CI1, a large gear ring 2, a long planetary gear 3, a long planetary gear shaft 6, a planetary gear frame 7, a large sun gear 8, steel plates 10, friction plates 11, a brake bracket 12, a small sun gear 13, a needle roller bearing 14, a short planetary gear shaft 15, a needle roller bearing 16, a short planetary gear 17, a main shaft 20, a connecting spline 21, a connecting bearing 22, an operating component BI 23, and an operating component BII. 24; The oil pump and control valve are used to fill and release oil into the control components CI1, BI23, and BII24, thereby enabling the engagement and disengagement of the steel plate 10 and the friction plate 11. When the steel plate 10 and the friction plate 11 are engaged, they connect with the outer hub, thus achieving braking of the components; the external spline of the large gear ring 2 is connected to the friction plate 11, and the internal gear is connected to the long planetary gear 3; two needle roller bearings 14 are installed between the long planetary gear 3 and the long planetary gear shaft 6, and one needle roller bearing 16 is installed between the short planetary gear 17 and the short planetary gear shaft 15; the long planetary gear 3, The long planetary gear shaft 6 forms a structural component that is mounted on the planetary gear frame 7, and the short planetary gears 17 and short planetary gear shafts 15 form structural components that are mounted on the planetary gear frame 7. The brake bracket 12 connects the operating component BI23 to the small sun gear 13. The connecting spline 21 is connected to the main shaft 20 through a spline fit. The main shaft 20 is equipped with rolling bearings to support the large sun gear 8. The small sun gear 13 is supported by the main shaft 20 and connected through rolling bearings. There is a connecting bearing between the large sun gear 8 and the planetary gear frame 7, and a connecting bearing is also installed between the main shaft 20 and the small sun gear 13.

[0007] Among them, the control components CI1, BI23 and BII24 are all hydraulic control devices and are all connected to the outer hub, which is a fixed structural component.

[0008] The large gear ring 2 is a thin-walled annular structure with an external spline internal gear structure, which is processed by internal and external gear grinding.

[0009] The long planetary gear 3 and the short planetary gear 17 each have a right friction-reducing pad 18 and a left friction-reducing pad 19 at both ends. The friction-reducing pads are made of copper rod QA110-3-1.5 aluminum bronze.

[0010] Among them, locking bolt 4 is used to lock the long planetary gear shaft 6 and the planetary gear frame 7 together; oil plug 1 5 is used to seal the lubrication oil passage of the long planetary gear shaft 6, and oil plug 2 9 is used to seal the lubrication oil passage of the planetary gear frame 7; the short planetary gear shaft 15 and the planetary gear frame 7 adopt an interference fit, and the short planetary gear shaft 15 is directly pressed into the planetary gear frame 7 during installation.

[0011] The small sun gear 13 has 29 teeth, the large sun gear 8 has 38 teeth, the short planet gear 17 has 21 teeth, the long planet gear 3 has 22 teeth, and the large gear ring 2 has 82 teeth. The module of the small sun gear 13, the large sun gear 8, the short planet gear 17, and the long planet gear 3 is 4, and the clearance coefficient C* = 0.35.

[0012] The composite planetary gear set is lubricated by splash lubrication. The lubricating oil is used to lubricate the needle roller bearing 14 in the long planetary gear 3 and the needle roller bearing 16 in the short planetary gear 17. The lubricating oil is injected from the sun gear 8, one path goes along the planetary gear frame 7 into the needle roller bearing 14 in the long planetary gear 3, and the other path is injected into the needle roller bearing 16 in the short planetary gear 17.

[0013] When the compound planetary gear set is in operation, with the large sun gear 8 as the input shaft and the main shaft 20 as the output shaft, operating oil is injected into the clutch CI, but not into the brakes BI and BII. The operating oil pressure is 1.8-2.2 MPa. The clutch CI brakes the large ring gear, the large sun gear 8 meshes with the long planet gear 3, the long planet gear 3 meshes with the short planet gear 17, and the planet gear frame 7 is connected to the main shaft 20 as the output. Under this operating condition, the transmission ratio is:

[0014]

[0015]

[0016] When the large sun gear 8 is loaded as the input shaft, lubricating oil is injected into the large sun gear 8 and sprayed into the planet gear frame 7 through the large sun gear 8. The lubricating oil further enters the long planet gear shaft 6, which has inclined, axial and radial lubricating oil openings. The lubricating oil enters the needle roller bearing 14 in the long planet gear shaft 6 and the long planet gear 3 for lubrication. At the same time, the lubricating oil is thrown out through the gap between the bearing and the gear.

[0017] When the compound planetary gear set is in operation, when brake BI is injected with operating oil, clutch CIBII is not injected with operating oil, and the operating oil pressure is 1.8-2.2 MPa, brake BI brakes the planetary gear frame 7. At this time, the gear train becomes a fixed-axis gear train, with the large sun gear 8 meshing with the long planet gear 3, the long planet gear 3 meshing with the short planet gear 17, and the short planet gear 17 meshing with the small sun gear 13 as output. The transmission ratio at this time is:

[0018]

[0019] When the compound planetary gear set is in operation, the brake BII is injected with operating oil, while the clutch CIBI is not injected with operating oil. The operating oil pressure is 1.8-2.2 MPa. The brake BII brakes the small sun gear 13. At this time, the large sun gear 8 meshes with the long planet gear 3, and the long planet gear 3 meshes with the short planet gear 17. The short planet gear 17 meshes with the output. The transmission ratio at this time is:

[0020]

[0021]

[0022]

[0023] (III) Beneficial Effects

[0024] The aforementioned technical solution, featuring a double-sun gear composite planetary gear set adapted for high-power planetary transmission mechanisms, represents a significant advancement in improving the power density and reducing the size of planetary transmission mechanisms. This patent is applicable to high-power hydraulic machinery and is of great importance to the design and development of planetary transmission mechanisms for hydraulic machinery. Attached Figure Description

[0025] Figure 1 This is a design drawing of a double sun gear composite planetary array according to an embodiment of the present invention.

[0026] Figure 2 This is a diagram of the lubrication system of a double sun gear composite planetary gear structure according to an embodiment of the present invention.

[0027] In the diagram: 1. Control component CI, 2. Large gear ring, 3. Long planetary gear, 4. Locking bolt, 5. Oil plug one, 6. Long planetary gear shaft, 7. Planetary gear frame, 8. Large sun gear, 9. Oil plug two, 10. Steel plate, 11. Friction plate, 12. Brake bracket, 13. Small sun gear, 14. Needle roller bearing one, 15. Short planetary gear shaft, 16. Needle roller bearing two, 17. Short planetary gear, 18. Right anti-friction pad, 19. Left anti-friction pad, 20. Main shaft, 21. Connecting spline, 22. Connecting bearing, 23. Control component BI, 24. Control component BII. Detailed Implementation

[0028] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0029] This embodiment, applicable to high-power planetary transmission mechanisms, utilizes a double-sun gear composite planetary gear set comprising two sun gears, a ring gear, a long planet gear, and a short planet gear, totaling five central rotating components. This embodiment achieves the functions and effects of two simple planetary gear sets with a single composite planetary gear set, significantly saving space in the transmission mechanism and increasing power density.

[0030] Reference Figure 1 As shown, the composite planetary gear set in this embodiment includes an operating component CI1, a large gear ring 2, a long planetary gear 3, a locking bolt 4, an oil plug 1 5, a long planetary gear shaft 6, a planetary gear frame 7, a large sun gear 8, an oil plug 2 9, a steel plate 10, a friction plate 11, a brake bracket 12, a small sun gear 13, a needle roller bearing 14, a short planetary gear shaft 15, a needle roller bearing 2 16, a short planetary gear 17, a right friction damper 18, a left friction damper 19, a main shaft 20, a connecting spline 21, a connecting bearing 22, an operating component BI 23, and an operating component BII 24. Except for standard parts such as bearings, bolts, and friction dampers, the rest are all forged steel structures.

[0031] Control components CI1, BI23, and BII24 are all hydraulic control devices and are all connected to the outer hub. The outer hub is a fixed structural component. The oil pump and control valve are used to fill and release oil into control components CI1, BI23, and BII24, thereby enabling the steel plate 10 and friction plate 11 to engage and disengage. When the steel plate 10 and friction plate 11 are engaged, they can connect with the outer hub, thereby enabling the braking of the components. For example, when control component CI1 is filled with oil, it will brake the large gear ring 2, that is, the speed of the large gear ring 2 is 0.

[0032] The large gear ring 2 is an external spline internal gear structure. The external spline is connected to the friction plate 11, and the internal gear is connected to the long planetary gear 3. The large gear ring 2 is a thin-walled circular ring structure, which is processed by internal and external gear grinding.

[0033] Two needle roller bearings 14 are installed between the long planetary gear 3 and the long planetary gear shaft 6, and one needle roller bearing 16 is installed between the short planetary gear 17 and the short planetary gear shaft 15. The needle roller bearings 14 and 16 mainly function to roll between the corresponding planetary gears and planetary gear shafts to achieve power transmission. Both ends of the long planetary gear 3 and the short planetary gear 17 have a right anti-friction pad 18 and a left anti-friction pad 19. To improve the wear resistance of the anti-friction pads, the material of the anti-friction pads is copper rod QA110-3-1.5 aluminum bronze.

[0034] The structural components formed by the long planetary gear 3, the long planetary gear shaft 6, the right friction-reducing pad 18, and the left friction-reducing pad 19 are installed on the planetary gear frame 7 and locked with locking bolts 4. The short planetary gear 17, the short planetary gear shaft 15, and the friction-reducing pads at both ends of the short planetary gear 17 are also installed on the planetary gear frame 7. The short planetary gear shaft 15 and the planetary gear frame 7 are interference fit. During installation, the short planetary gear shaft 15 is directly pressed into the planetary gear frame 7.

[0035] Locking bolt 4 secures the long planetary gear shaft 6 to the planetary gear frame 7. Oil plug 5 seals the lubrication passages of the long planetary gear shaft 6. Oil plug 9 seals the lubrication passages of the planetary gear frame 7 to achieve lubrication of the needle roller bearing 14.

[0036] The brake bracket 12 connects the control element BI23 to the small sun gear 13. The connecting spline 21 is connected to the main shaft 20 via a spline fit. The main shaft 20 is equipped with rolling bearings to support the large sun gear 8. The small sun gear 13 is also supported by the main shaft 20 and is connected via rolling bearings.

[0037] There is a connecting bearing 22 between the large sun gear 8 and the planetary gear frame 7. The main shaft 20 and the small sun gear 13 are also equipped with connecting bearings 22. The connecting bearings mainly serve to support the structure so as to realize the mutual rotation between the components.

[0038] The small sun gear 13 has 29 teeth, the large sun gear 8 has 38 teeth, the short planet gear 17 has 21 teeth, the long planet gear 3 has 22 teeth, and the large ring gear 2 has 82 teeth. The module of the small sun gear 13, the large sun gear 8, the short planet gear 17, and the long planet gear 3 is 4, and the clearance coefficient C* = 0.35.

[0039] In this embodiment, the composite planetary gear set uses splash lubrication. The composite planetary gear set lubrication system is described below. Figure 2 Lubricating oil is supplied to the needle roller bearing 14 in the long planetary gear 3 and the needle roller bearing 16 in the short planetary gear 17. The lubricating oil is injected from the sun gear 8, one path goes along the planetary gear frame 7 into the needle roller bearing 14 in the long planetary gear 3, and the other path goes into the needle roller bearing 16 in the short planetary gear 17.

[0040] This embodiment of the composite planetary set has the following three operating modes:

[0041] 1. Reference Figure 1 In the first operating mode, when the large sun gear 8 is the input shaft and the main shaft 20 is the output shaft, when the clutch CI is injected with operating oil, but the brakes BI and BII are not injected with operating oil, and the operating oil pressure is 1.8-2.2 MPa, the clutch CI brakes the large ring gear, the large sun gear 8 meshes with the long planet gear 3, the long planet gear 3 meshes with the short planet gear 17, and the planet gear frame 7 is connected to the main shaft 20 as the output. Under this condition, the transmission ratio is:

[0042]

[0043]

[0044] 2. When the large sun gear 8 is loaded as the input shaft, lubrication is required; otherwise, the entire system will burn out quickly. When lubricating oil is injected into the large sun gear 8, it is sprayed into the planetary gear frame 7 through the large sun gear 8 and further enters the long planetary gear shaft 6. The long planetary gear shaft 6 has inclined, axial, and radial lubricating oil. This lubricating oil can enter the needle roller bearings 14 in the long planetary gear shaft 6 and the long planetary gear 3 to lubricate the needle roller bearings. At the same time, the lubricating oil is thrown out through the gap between the bearing and the gear.

[0045] 3. There is a connecting bearing 22 between the large sun gear 8 and the planetary gear frame 7. The main shaft 20 and the small sun gear 13 are also equipped with connecting bearings 22. The connecting bearings mainly serve to support the structure so as to realize the mutual rotation between the components.

[0046] 4. In the second working mode, when brake BI is injected with control fluid but clutch CIBII is not, and the control fluid pressure is 1.8-2.2 MPa, brake BI brakes the planetary gear frame 7. At this time, the gear train becomes a fixed-axis gear train, with the large sun gear 8 meshing with the long planet gear 3, the long planet gear 3 meshing with the short planet gear 17, and the short planet gear 17 meshing with the small sun gear 13 as the output. The transmission ratio at this time is:

[0047]

[0048] 5. In the third operating mode, when brake BII is injected with control fluid but clutch CIBI is not, and the control fluid pressure is 1.8-2.2 MPa, brake BII engages the small sun gear 13. At this time, the large sun gear 8 meshes with the long planet gear 3, and the long planet gear 3 meshes with the short planet gear 17. The short planet gear 17 engages as the output. The transmission ratio at this time is:

[0049]

[0050]

[0051]

[0052] 6. By using this composite planetary gear set and controlling it with a clutch and brake, three power transmission methods can be achieved, realizing the functions of two simple planetary gear sets.

[0053] As can be seen from the above technical solution, the present invention has the following significant features:

[0054] 1. This composite planetary gear set consists of one gear ring, two sun gears and one planet carrier, achieving the function of two simple planetary gear sets while saving nearly one-third of the space.

[0055] 2. This composite planetary gear set reduces one gear ring, making the structure more compact and reducing volume and weight. At the same time, this solution has six operating modes through different inputs and outputs.

[0056] 3. The mass of the transmission mechanism has been reduced, which has significantly increased the power density of the transmission device.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism, characterized in that, include: The components are: control component CI (1), large gear ring (2), long planetary gear (3), long planetary gear shaft (6), planetary gear frame (7), large sun gear (8), steel plate (10), friction plate (11), brake bracket (12), small sun gear (13), needle roller bearing 1 (14), short planetary gear shaft (15), needle roller bearing 2 (16), short planetary gear (17), main shaft (20), connecting spline (21), connecting bearing 22, control component BI (23), and control component BII (24). Oil pumps and control valves are used to fill and drain control component CI (1), control component BI (23), and control component BII (24), enabling the steel plate (10) and friction plate (11) to engage and disengage. When the steel plate (10) and friction plate (11) engage, they connect with the outer hub, thus achieving braking of the components. The external spline of the large gear ring (2) connects to the friction plate (11), and the internal gear connects to the long planetary gear (8). 3) Connection; Two needle roller bearings (14) are installed between the long planetary gear (3) and the long planetary gear shaft (6), and a needle roller bearing (16) is installed between the short planetary gear (17) and the short planetary gear shaft (15); The structural component formed by the long planetary gear (3) and the long planetary gear shaft (6) is installed on the planetary gear frame (7), and the structural component formed by the short planetary gear (17) and the short planetary gear shaft (15) is installed on the planetary gear frame (7); The brake bracket (12) connects the operating component BI (23) to the small sun gear (13), and the connecting spline (21) is connected to the main shaft (20) through spline fit. Rolling bearings are installed on the main shaft (20) to support the large sun gear (8), and the small sun gear (13) is supported by the main shaft (20) and connected through rolling bearings; There is a connecting bearing between the large sun gear (8) and the planetary gear frame (7), and a connecting bearing is also installed between the main shaft (20) and the small sun gear (13); Use locking bolts (4) to lock the long planetary gear shaft (6) and the planetary gear frame (7) together; use oil plug one (5) to seal the lubrication passage of the long planetary gear shaft (6), and use oil plug two (9) to seal the lubrication passage of the planetary gear frame (7); the short planetary gear shaft (15) and the planetary gear frame (7) are interference fit, and the short planetary gear shaft (15) is directly pressed into the planetary gear frame (7) during installation; The composite planetary gear set is lubricated by splash lubrication. The lubricating oil is used to lubricate the needle roller bearing 1 (14) in the long planetary gear (3) and the needle roller bearing 2 (16) in the short planetary gear (17). The lubricating oil is injected from the sun gear (8), one path goes along the planetary gear frame (7) into the needle roller bearing 1 (14) in the long planetary gear (3), and the other path is injected into the needle roller bearing 2 (16) in the short planetary gear (17).

2. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 1, characterized in that, The control components CI (1), BI (23) and BII (24) are all hydraulic control devices and are all connected to the outer hub, which is a fixed structural component.

3. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 2, characterized in that, The large gear ring (2) is a thin-walled annular structure with an external spline internal gear structure, which is processed by internal and external gear grinding.

4. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 3, characterized in that, Both ends of the long planetary gear (3) and the short planetary gear (17) have a right friction-reducing pad (18) and a left friction-reducing pad (19), and the friction-reducing pad is made of copper rod QA110-3-1.5 aluminum bronze.

5. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 4, characterized in that, The small sun gear (13) has 29 teeth, the large sun gear (8) has 38 teeth, the short planet gear (17) has 21 teeth, the long planet gear (3) has 22 teeth, and the large gear ring (2) has 82 teeth; the modules of the small sun gear (13), the large sun gear (8), the short planet gear (17), and the long planet gear (3) are all 4, and the clearance coefficient C* = 0.

35.

6. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 5, characterized in that, When the composite planetary gear set is in operation, with the large sun gear (8) as the input shaft and the main shaft (20) as the output shaft, when the clutch CI injects operating oil, the brakes BI and BII do not inject operating oil, and the operating oil pressure is 1.8-2.2 MPa, the clutch CI brakes the large ring gear, the large sun gear (8) meshes with the long planet gear (3), the long planet gear (3) meshes with the short planet gear (17), and the planet gear frame (7) is connected to the main shaft (20) as the output. Under this operating condition, the transmission ratio is: （1） （2） When the large sun gear (8) is loaded as the input shaft, lubricating oil is injected into the large sun gear (8) and sprayed into the planet gear frame (7) through the large sun gear (8), and further enters the long planet gear shaft (6). The long planet gear shaft (6) has inclined, axial and radial lubricating oil. The lubricating oil enters the needle roller bearing (14) in the long planet gear shaft (6) and the long planet gear (3) for lubrication, and at the same time, the lubricating oil is thrown out through the gap between the bearing and the gear.

7. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 6, characterized in that, When the composite planetary gear set is in operation, when brake BI is injected with operating oil, clutch CI and brake BII are not injected with operating oil. The operating oil pressure is 1.8-2.2 MPa. Brake BI brakes the planetary gear frame (7). At this time, the gear train becomes a fixed-axis gear train, with the large sun gear (8) meshing with the long planet gear (3), the long planet gear (3) meshing with the short planet gear (17), and the short planet gear (17) meshing with the small sun gear (13) as output. The transmission ratio at this time is: （3）。 8. The double-sun gear composite planetary gear set adapted to a high-power planetary transmission mechanism as described in claim 7, characterized in that, When the composite planetary gear set is in operation, brake BII is injected with operating oil, while clutch CI and brake BII are not injected with operating oil. The operating oil pressure is 1.8-2.2 MPa. Brake BII brakes the small sun gear (13). At this time, the large sun gear (8) meshes with the long planet gear (3), the long planet gear (3) meshes with the short planet gear (17), and the short planet gear (17) meshes with the main shaft (20) as output. The transmission ratio at this time is: （4） （5） （6）。

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