An ultra-compact power split detachable wind turbine main drive system

Abstract

The present invention relates to an ultra-compact, power-splitting, detachable wind turbine main drive system, comprising a primary planetary gear train, a secondary planetary gear train, a supporting main structure, a generator, and a hub. The hub is supported on the supporting main structure via a main shaft bearing, the right side of the hub connected to a primary planetary carrier, which is connected to an input system. The primary planetary carrier is floatingly connected to a secondary ring gear via a floating spline sleeve, and the secondary ring gear is disposed on the secondary planetary carrier. The hub simultaneously drives the primary planetary carrier and the secondary ring gear, with the primary planetary carrier rotating the primary planetary gears, and the secondary ring gear rotating the secondary planetary gears, thereby achieving power splitting. The present invention significantly reduces the overall size of the wind turbine transmission chain, achieves high power density, is compact in structure, lightweight, and low in cost, and each level of components can be independently detached, making maintenance and replacement easy and cost-effective.

Description

Technical Field

[0001] The present invention relates to the field of mechanical transmission technology, and in particular to an ultra-compact power split detachable wind power main transmission system for use in a wind power non-direct drive transmission system. Background Art

[0002] A common non-direct drive wind turbine transmission system is composed of components such as a gearbox, a main shaft, main shaft bearings, a bearing seat, a locking plate and a coupling. The wind wheel is connected to the gearbox through the main shaft. The main shaft is supported on the nacelle floor by one or two main shaft bearings and bearing seats. The main function of the main shaft is to support the entire wind wheel and withstand the bending moment of the wind turbine; the main function of the gearbox is to achieve speed matching between the wind wheel and the generator, and to transfer the energy captured by the wind wheel to the generator. The overall size of this transmission chain is long, wide and heavy.

[0003] Gearboxes in traditional transmission chains typically employ a primary planetary gear + secondary parallel gear structure, or a secondary planetary gear + primary parallel gear structure. The low-speed gears in the gearbox must bear all the torque of the wind turbine, resulting in heavy loads and a high transmission ratio. Under the same torque input, the gears experience high bending moment stress and Hertzian contact stress. However, the allowable load capacity of gear materials is limited. Therefore, to maintain contact and bending safety margins, the low-speed ring gear in traditional transmission chains has a larger diameter and is therefore heavier overall.

[0004] As a relatively integral component, the gearbox needs to be replaced and repaired as a whole when a planetary-level failure occurs, especially when the fragile planetary-level structure fails. The aerial lifting and replacement involved is costly and very difficult to disassemble, requiring the use of additional large-scale lifting equipment and tooling. The on-site maintenance work is large, the replacement is difficult, and the maintenance cost is high. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an ultra-compact power-split detachable wind turbine main transmission system, which uses the main shaft bearing to support the hub system, and the first-level planetary carrier is directly connected to the hub, which greatly reduces the overall size of the transmission chain. The first-level planetary carrier is connected to the second-level ring gear through a floating connecting sleeve, with high power density, light weight and low cost; the transmission components of each level of the transmission system can be relatively independent and can be easily disassembled in the wind turbine cabin; the disassembled components are light in weight, easy to repair and replace, and reduce maintenance costs; the ring gear structure is simplified, the process and manufacturing difficulty are reduced, the planetary carrier bearings are saved, and the production cost is reduced.

[0006] The objective of the present invention is achieved as follows: it includes a primary planetary gear train, a secondary planetary gear train, a supporting main structure, a generator and a hub, the primary planetary gear train includes a primary ring gear, a primary planet carrier and a primary sun gear, the secondary planetary gear train includes a secondary ring gear, a secondary planet carrier and a secondary sun gear; the hub is supported on the supporting main structure through a main shaft bearing, the right side of the hub is connected to the primary planet carrier, and the left end of the primary planet carrier is connected to the hub through a flange; the primary planet carrier is floatingly connected to the secondary ring gear through a floating spline sleeve, and the secondary ring gear is arranged on the secondary planet carrier, the hub drives the primary planet carrier and the secondary ring gear at the same time, the primary planet carrier drives the primary planet gear to rotate, and the secondary ring gear drives the secondary planet gear to rotate, thereby realizing power diversion.

[0007] Furthermore, the primary ring gear is connected to the secondary sun gear through a first adapter sleeve, the secondary ring gear drives the secondary sun gear to rotate, and the secondary sun gear drives the primary ring gear to rotate through the first adapter sleeve, and the rotation of the primary ring gear and the primary planetary carrier jointly drives the primary sun gear to rotate.

[0008] Furthermore, the primary sun gear directly drives the generator.

[0009] Furthermore, the first-stage sun gear drives a three-stage planetary gear train.

[0010] Furthermore, the three-stage planetary gear train includes a three-stage planetary carrier, a three-stage sun gear and a three-stage ring gear; the three-stage planetary gear train is supported on the right side of the second-stage planetary carrier through the three-stage planetary carrier bearing, and the three-stage ring gear is fixed to the second-stage planetary carrier through the first flange; the three-stage planetary carrier is connected to the first-stage sun gear.

[0011] Furthermore, the housing of the generator is connected to the third-stage ring gear through a second flange; the rotation of the first-stage sun gear drives the rotation of the third-stage planet carrier.

[0012] Furthermore, the three-stage planetary gear train drives a generator or a four-stage transmission.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The hub of the present invention is supported on the supporting main structure through the main shaft bearing, supporting the hub system, and the right side of the hub is connected to the first planet carrier in the first planetary stage assembly; a spline flange is provided on the outside of the first planet carrier; the second planet carrier in the second planetary stage assembly is connected to the supporting main structure, and the second inner ring gear is supported on the second planet carrier through a four-point contact ball bearing pair, and a spline is provided on the outside of the second inner ring gear, and the second ring gear is connected to the first planet carrier through a floating spline sleeve; the wind wheel directly drives the first planet carrier to rotate; the first planet carrier drives the first planet gear to rotate, and at the same time, the first planet carrier drives the second inner ring gear to rotate through the floating spline sleeve; the second ring gear drives the second planet gear to rotate, and the second planet gear drives the second sun gear to rotate, and the second sun gear is connected to the first ring gear through a connecting sleeve; through the meshing motion of the first planetary stage, the input power of the first ring gear and the second sun gear is finally output as a whole to the first sun gear, and the first sun gear can directly drive the generator or drive the third stage transmission. The first-stage planetary frame and the second-stage ring gear jointly bear the torque from the wind wheel, greatly reducing the load on the single-stage gear; under the condition of the same input torque, the planetary ring gear can be made smaller and the overall weight lighter; at the same time, large-sized components such as locking plates, end covers, torque arms, and elastic supports are eliminated, and the length and width of the entire transmission chain are greatly reduced, further reducing the weight of the entire transmission system, reducing costs, and achieving greater overall power within the current height and width restrictions for road transportation.

[0015] (2) The first-stage planetary carrier and the second-stage ring gear of the present invention are connected by a floating spline sleeve. The spline has the angular, radial and axial complementary functions. The misalignment between the first-stage planetary carrier shaft system and the second-stage planetary carrier shaft system caused by the structural deformation of the system is isolated from the influence of the wind wheel bending moment fluctuation on the second-stage meshing smoothness, and at the same time, the influence of machining errors can be reduced.

[0016] (3) The inner surface of the secondary gear ring of the present invention is provided with two angular contact ball raceway surfaces, and two contact ball bearing inner rings are fixed on the secondary planetary carrier. By pre-tightening the bearings, the rotation center of the secondary gear ring is made concentric with the secondary planetary carrier, eliminating and reducing the influence of the gravity of the secondary gear ring on the uneven meshing of the secondary planetary gear system, greatly improving the load distribution between the planetary gears of the secondary planetary gear system; the secondary planetary carrier is connected to the main support structure through a flange, greatly improving the rigidity and strength of the main structure. The multi-stage transmission of the present invention is relatively independent and detachable. After a single stage fails, it can be easily disassembled, removed and replaced without the need for additional large-scale lifting equipment and tooling, greatly reducing the amount of engineering work required for aerial maintenance and replacement of the wind power transmission system, and can easily realize the independent replacement of failed planetary gear systems at all levels, greatly reducing the cost of maintenance and replacement and the power loss caused by the shutdown of the entire machine due to maintenance and replacement.

[0017] (4) The supporting main structure of the present invention adopts a cylindrical nacelle system, which is composed of two cylinders intersecting vertically and horizontally at a certain angle. This type of nacelle structure is simple in form, which can greatly reduce the number of components of the nacelle system, save the processing time of components and the assembly time of the fan nacelle system. In addition, multiple support positions are set in the nacelle cylinder that is connected to the hub to support the main shaft and the planetary carrier, greatly improving the rigidity and strength of the entire nacelle system, and assuming the housing function of the gearbox, greatly reducing the weight of the entire nacelle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of Example 1 of the present invention.

[0019] Figure 2 Schematic cross-section of the planetary gear train of Example 1.

[0020] Figure 3 This is a schematic structural diagram of Example 2 of the present invention.

[0021] Figure 4 This is a cross-sectional schematic diagram of the three-stage planetary gear train of Example 2.

[0022] in:

[0023] First-stage planetary gear train 1, first-stage ring gear 1.1, first-stage planet carrier 1.2, first-stage sun gear 1.3, second-stage planetary gear train 2, second-stage ring gear 2.1, second-stage ring gear left bearing 2.2, second-stage planet carrier 2.3, second-stage sun gear 2.4, second-stage ring gear right bearing 2.5, main support structure 3, generator 4, adapter sleeve 5, floating spline sleeve 6, main shaft bearing 7, wheel hub 8, first flange 9, third-stage planetary gear train 10, second flange 11, third-stage planet carrier bearing 12. DETAILED DESCRIPTION

[0024] Example 1:

[0025] See also Figure 1-2 The present invention relates to an ultra-compact power split detachable wind power main transmission system, which includes a primary planetary gear train 1, a secondary planetary gear train 2, a supporting main structure 3, a generator 4 and a hub 8.

[0026] The first-stage planetary gear train 1 includes a first-stage ring gear 1.1, a first-stage planetary carrier assembly and a first-stage sun gear 1.3; the second-stage planetary gear train 2 includes a second-stage ring gear 2.1, a second-stage ring gear left bearing 2.2, a second-stage planetary carrier assembly, a second-stage sun gear 2.4 and a second-stage ring gear right bearing 2.5; the first-stage planetary carrier assembly includes a first-stage planetary carrier 1.2, a first-stage planetary wheel, a planetary wheel bearing and a planetary pin shaft; the second-stage planetary carrier assembly includes a second-stage planetary carrier 2.3, a second-stage planetary wheel, a planetary wheel bearing and a planetary pin shaft.

[0027] The hub 8 is supported on the supporting main structure 3 through the main shaft bearing 7. The right side of the hub 8 is connected to the primary planet carrier 1.2. The left end of the primary planet carrier 1.2 is connected to the input system through a flange.

[0028] The primary planet carrier 1.2 is provided with a spline flange, and the secondary ring gear 2.1 is provided with a spline. The primary planet carrier 1.2 is floatingly connected to the secondary ring gear 2.1 through a floating spline sleeve 6. The secondary ring gear 2.1 is set on the secondary planet carrier 2.3 through the secondary ring gear left bearing 2.2 and the secondary ring gear right bearing 2.5. The secondary planetary gear train 2 is connected to the supporting main structure 3 through the secondary planet carrier 2.3.

[0029] A flange connection adapter sleeve 5 is provided on the right side of the primary ring gear 1.1. The primary ring gear 1.1 is connected to the secondary sun gear 2.4 through the adapter sleeve 5. The secondary ring gear 2.1 drives the secondary sun gear 2.4 to rotate through the meshing movement of the planetary gear system. The secondary sun gear 2.4 drives the primary ring gear 1.1 to rotate through the adapter sleeve 5. The rotation of the primary ring gear 1.1 and the primary planet carrier 1.2 jointly drives the primary sun gear 1.3 to rotate through the meshing of the primary planetary gear system 1.

[0030] The hub 8 directly drives the primary planet carrier 1.2 to rotate; the primary planet carrier 1.2 drives the primary planetary gears to rotate, and at the same time, the primary planet carrier 1.2 drives the secondary ring gear 2.1 to rotate through the floating spline sleeve 6; the secondary ring gear 2.1 drives the secondary planetary gears to rotate, and the secondary planetary gears drive the secondary sun gear 2.4 to rotate, and the secondary sun gear 2.4 is connected to the primary ring gear 1.1 through the adapter sleeve 5; through the meshing movement of the primary planetary stages, the input power of the primary ring gear 1.1 and the secondary sun gear 2.4 is finally output as a whole to the primary sun gear 1.3, and the primary sun gear 1.3 directly drives the generator 4, realizing power diversion.

[0031] The supporting main structure 3 includes a cylindrical cabin shell and a lower cylinder. One end of the lower cylinder intersects and communicates with the side wall of the cylindrical cabin shell. The cross-sections of the cylindrical cabin shell and the lower cylinder are T-shaped. The cylindrical cabin shell is docked with the hub of the wind turbine. Three support frames are arranged inside the cylindrical cabin shell to support the main shaft and the planetary carrier, greatly improving the rigidity and strength of the entire cabin system, and assuming the housing function of the gearbox, reducing the weight of the entire cabin. The lower cylinder is mainly connected to the yaw system, tower and other components of the wind turbine.

[0032] Working principle:

[0033] The hub system of the present invention is supported on the supporting main structure through a main shaft bearing, which supports the hub system. The right side of the hub is connected to the first-stage planet carrier in the first-stage planetary stage assembly; a spline flange is provided on the outside of the first-stage planet carrier; the second-stage planet carrier in the second-stage planetary stage assembly is connected to the supporting main structure, and the second-stage inner ring gear is supported on the second-stage planet carrier through a four-point contact ball bearing pair. The second-stage inner ring gear is provided with splines on the outside, and the second-stage ring gear is connected to the first-stage planet carrier through a floating spline sleeve; the wind wheel directly drives the first-stage planet carrier to rotate; the first-stage planet carrier drives the first-stage planet gears to rotate, and at the same time, the first-stage planet carrier drives the second-stage inner ring gear to rotate through the floating spline sleeve; the second-stage ring gear drives the second-stage planet gears to rotate, and the second-stage planet gears drive the second-stage sun gear to rotate, and the second-stage planet gears drive the second-stage sun gear to rotate, and the second-stage sun gear is connected to the first-stage ring gear through a connecting sleeve; through the meshing motion of the first planetary stage, the input power of the first ring gear and the second sun gear is ultimately output as a whole to the first-stage sun gear, and the first-stage sun gear can directly drive the generator or drive the third-stage transmission. The first-stage planetary frame and the second-stage ring gear jointly bear the torque from the wind wheel, greatly reducing the load on the single-stage gear. Under the same input torque, the planetary ring gear can be made smaller and lighter overall. At the same time, large-sized components such as locking plates, end covers, torque arms, and elastic supports are eliminated, which also greatly reduces the length and width of the entire transmission chain, further reducing the weight of the entire transmission system, reducing costs, and achieving greater overall power within the current height and width restrictions for highway transportation.

[0034] Example 2:

[0035] See also Figure 3-4 The present invention relates to an ultra-compact power split detachable wind power main transmission system, which is different from Example 1 in that the first-stage sun gear 1.3 drives the three-stage planetary gear train 10, and the three-stage planetary gear train 10 drives the generator 4 or drives the four-stage transmission. The high-speed shaft of the four-stage transmission is connected to the generator 4 to drive the generator 4 to generate electricity.

[0036] The three-stage planetary gear train 10 includes a three-stage planet carrier 10.1, a three-stage sun gear 10.2, and a three-stage ring gear 10.3. The three-stage planetary gear train 10 is supported on the right side of the second-stage planet carrier 2.3 via a three-stage planet carrier bearing 12. The three-stage ring gear 10.3 is fixed to the second-stage planet carrier 2.3 via a first flange 9. The three-stage planet carrier 10.1 is connected to the first-stage sun gear 1.3, and the third-stage sun gear 10.2 is connected to the input shaft of the generator 4.

[0037] The housing of the generator 4 is connected to the third-stage ring gear 10.3 via a second flange 11; the rotation of the first-stage sun gear 1.3 drives the third-stage planet carrier 10.1 to rotate, and the sun gear is driven by the meshing operation of the planetary gears.

[0038] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. An ultra-compact power split detachable wind turbine main drive system, characterized by: It comprises a primary planetary gear train (1), a secondary planetary gear train (2), a supporting main structure (3), a generator (4) and a hub (8), wherein the primary planetary gear train (1) comprises a primary ring gear (1.1), a primary planet carrier (1.2) and a primary sun gear (1.3), and the secondary planetary gear train (2) comprises a secondary ring gear (2.1), a secondary planet carrier (2.3) and a secondary sun gear (2.4); the hub (8) is supported on the supporting main structure (3) through a main shaft bearing (7), and the right side of the hub (8) is in contact with the primary planetary gear train. The first planet carrier (1.2) is connected to the planet carrier (1.2), the left end of the first planet carrier (1.2) is connected to the hub (8) via a flange; the first planet carrier (1.2) is floatingly connected to the second ring gear (2.1) via a floating spline sleeve (6), the second ring gear (2.1) is arranged on the second planet carrier (2.3), the hub (8) drives the first planet carrier (1.2) and the second ring gear (2.1) simultaneously, the first planet carrier (1.2) drives the first planet gear to rotate, and the second ring gear (2.1) drives the second planet gear to rotate, thereby realizing power splitting; The primary ring gear (1.1) is connected to the secondary sun gear (2.4) via an adapter sleeve (5); the secondary ring gear (2.1) drives the secondary sun gear (2.4) to rotate via the secondary planetary gear; the secondary sun gear (2.4) drives the primary ring gear (1.1) to rotate via the adapter sleeve (5); the rotation of the primary ring gear (1.1) and the primary planetary carrier (1.2) jointly drives the primary sun gear (1.3) to rotate; The supporting main structure (3) comprises a cylindrical cabin shell and a lower cylinder, one end of the lower cylinder intersects and communicates with the side wall of the cylindrical cabin shell, and the cross-sections of the cylindrical cabin shell and the lower cylinder are T-shaped structures.

2. The ultra-compact power split detachable wind turbine main transmission system according to claim 1, characterized in that: The primary sun wheel (1.3) directly drives the generator (4).

3. The ultra-compact power split detachable wind turbine main transmission system according to claim 1, characterized in that: The first-stage sun gear (1.3) drives the third-stage planetary gear train (10).

4. The ultra-compact power split detachable wind turbine main transmission system according to claim 3, characterized in that: The three-stage planetary gear train (10) comprises a three-stage planetary carrier (10.1), a three-stage sun gear (10.2) and a three-stage ring gear (10.3); the three-stage planetary gear train (10) is supported on the right side of the second-stage planetary carrier (2.3) via a three-stage planetary carrier bearing (12); the three-stage ring gear (10.3) is fixed to the second-stage planetary carrier (2.3) via a first flange (9); and the three-stage planetary carrier (10.1) is connected to the first-stage sun gear (1.3).

5. The ultra-compact power split detachable wind turbine main transmission system according to claim 4, characterized in that: The housing of the generator (4) is connected to the third-stage ring gear (10.3) via a second flange (11); the rotation of the first-stage sun gear (1.3) drives the third-stage planet carrier (10.1) to rotate.

6. The ultra-compact power split detachable wind turbine main transmission system according to claim 3, characterized in that: The three-stage planetary gear train (10) drives a generator (4) or a four-stage transmission.

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