A compact semi-direct drive wind turbine gearbox power split transmission structure

Abstract

The present invention discloses a compact semi-direct drive wind power gearbox power split transmission structure, including a main bearing and a hub side and a generator side planetary gear train adopting a single double-row flange main bearing structure, the planetary carriers of the two planetary gear trains are fixedly integrated with the inner ring of the main bearing to form a double-linked planetary carrier, the input power is transmitted from the double-linked planetary carrier to the respective planetary gear transmission systems, the inner gear ring on the generator side is fixedly integrated with the outer ring of the main bearing, the gearbox housing and the generator housing, the generator side sun gear is connected to the hub side inner gear ring, and the hub side sun gear is connected to the generator; the planetary carrier input power of the generator side planetary gear train is transmitted to the hub side inner gear ring through its planetary gear and the generator side sun gear, and is synthesized with the planetary gear power of the hub side planetary gear train, and the hub side sun gear transmits the power to the generator. The present invention integrates the medium-speed gearbox with the main shaft bearing, and the gearbox adopts a two-stage power split differential + flexible pin structure to make the structure more compact.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power gearbox transmission, and in particular to a compact semi-direct drive wind power gearbox power split transmission structure. Background Art

[0002] It is well known in the industry that the traditional transmission system of wind turbines mainly uses a long main shaft and a high-speed gearbox. This structure is more commonly used below the 3MW platform, but the axial dimension of the entire traditional system is very long, the radial and axial dimensions of the gearbox are also large, and the high-speed stage of the gearbox has more faults. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies and shortcomings of the prior art, and propose a compact semi-direct drive wind power gearbox power split transmission structure. For the high-power compact semi-direct drive traditional system, the medium-speed gearbox is integrated with the main shaft bearing, and the gearbox adopts a two-stage power split differential + flexible pin structure, providing a solution for the semi-direct drive wind power gearbox transmission structure. At the same time, the power of the wind turbine generator set can be applied between 2.5MW and 15MW, and the gearbox power split differential two-stage can be extended to three or four stages.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a compact semi-direct drive wind power gearbox power split transmission structure, including a main bearing with a single double-row flange main bearing structure and a two-stage planetary gear train; the main bearing is built into the gearbox to withstand the force and bending moment load transmitted by the wind wheel and reduce the impact of the alternating load on the gearbox; the two-stage planetary gear train includes a hub-side planetary gear train close to the hub side and a generator-side planetary gear train close to the generator side, the planet carrier of the hub-side planetary gear train and the planet carrier of the generator-side planetary gear train are bolted together through the inner ring of the main bearing to form a double-connected planet carrier, and the planet carrier of the hub-side planetary gear train is connected to the hub, The input power is transmitted from the double planetary carrier to the respective planetary gear transmission systems; the generator-side inner gear ring of the generator-side planetary gear system is fixedly connected with the outer ring of the main bearing, the gear box body and the outer shell of the generator by bolts, the generator-side sun gear of the generator-side planetary gear system is connected with the hub-side inner gear ring of the hub-side planetary gear system by a connecting plate, and the hub-side sun gear of the hub-side planetary gear system is connected to the generator; the input power of the planetary carrier of the generator-side planetary gear system is transmitted to the hub-side inner gear ring through its planetary gears and the generator-side sun gear, and is combined with the planetary gear power of the hub-side planetary gear system, and transmitted to the hub-side sun gear, and finally the hub-side sun gear transmits the power to the generator.

[0005] Furthermore, each planetary gear adopts a flexible pin structure for load balancing, and the flexible pin structure consists of a flexible pin shaft and a pin sleeve. The flexible pin shaft has an interference fit with the planetary carrier, and the pin sleeve has an interference fit with the flexible pin shaft, and supports the planetary bearings and planetary gears. When two tangential forces from the inner ring gear and the sun gear are applied to the planetary gear, the angular deflection caused by the bending of the flexible pin shaft on the planetary carrier can be offset by the angular deflection caused by the bending of the pin sleeve from the other end of the flexible pin shaft in the opposite direction, so that each planetary gear floats in parallel, and the load is evenly distributed between each planetary gear.

[0006] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0007] 1. This transmission structure does not use a long main shaft, but a single double-row flange main bearing structure, which greatly reduces the axial size of the transmission chain.

[0008] 2. It adopts two-stage power split differential and medium-speed transmission. The gearbox has one less parallel shaft transmission than the high-speed transmission, which reduces the axial size of the gearbox and is particularly suitable for high-power wind turbines.

[0009] 3. The flexible pin structure is used to make the planetary gear float and load evenly, making the load of the multi-planetary gear system more uniform, the transmission more stable, and effectively improving the service life. The axial size is further reduced and the structure is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the power split transmission structure of the compact semi-direct drive wind turbine gearbox of this embodiment. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with specific embodiments.

[0012] See also Figure 1As shown, the compact semi-direct drive wind turbine gearbox power split transmission structure provided in this embodiment includes a main bearing with a single double-row flange main bearing structure and a two-stage planetary gear train, wherein the main bearing is built into the gearbox to withstand loads such as force and bending moment transmitted from the wind wheel to reduce the impact of alternating loads on the gearbox, the two-stage planetary gear train includes a hub-side planetary gear train close to the hub side and a generator-side planetary gear train close to the generator side, the planet carrier 5 of the hub-side planetary gear train and the planet carrier 9 of the generator-side planetary gear train are bolted together through the inner ring 6 of the main bearing to form a double-coupled planetary carrier, the planet carrier 5 of the hub-side planetary gear train is connected to the hub, and the power input by the wind turbine blades is transmitted from the double-coupled planetary carrier The power is transmitted to their respective planetary gear transmission systems, the generator-side inner gear ring 12 of the generator-side planetary gear system is fixedly connected with the outer ring 7 of the main bearing, the gear box body 11 and the generator housing 13 by bolts, the generator-side sun gear 17 of the generator-side planetary gear system is connected with the hub-side inner gear ring 8 of the hub-side planetary gear system by a connecting plate 10, the hub-side sun gear 1 of the hub-side planetary gear system is connected to the generator, and the planetary carrier input power of the generator-side planetary gear system is transmitted to the hub-side inner gear ring 8 through its planetary gear 14 and the generator-side sun gear 17, and is combined with the power of the planetary gear 2 of the hub-side planetary gear system, and transmitted to the hub-side sun gear 1, and finally the hub-side sun gear 1 transmits the power to the generator.

[0013] In addition, the planetary wheels 2 and 14 both use a flexible pin structure for load balancing. The flexible pin structure of the planetary wheel 2 is composed of a flexible pin shaft 3 and a pin sleeve 4, and the flexible pin structure of the planetary wheel 14 is composed of a flexible pin shaft 16 and a pin sleeve 15. The flexible pin shafts 3 and 16 are interference fit with their respective planetary carriers, and the pin sleeves 4 and 15 are interference fit with their respective flexible pin shafts, and support the planetary bearings and planetary wheels. When the two tangential forces of the inner ring gear and the sun gear are applied to the planetary wheels, the angular deflection caused by the bending of the flexible pin shaft on the planetary carrier can be offset by the angular deflection caused by the bending of the pin sleeve from the other end of the flexible pin shaft in the opposite direction, so that each planetary wheel floats in parallel, and the load is evenly distributed between each planetary wheel. At the same time, the flexible pin structure further reduces the axial dimension, making the transmission system more compact.

[0014] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A compact semi-direct drive wind turbine gearbox power split transmission structure, characterized in that: It includes a main bearing with a single double-row flange main bearing structure and a two-stage planetary gear train; the main bearing is built into the gear box to withstand the force and bending moment load transmitted by the wind wheel and reduce the impact of the alternating load on the gear box; the two-stage planetary gear train includes a hub-side planetary gear train close to the hub side and a generator-side planetary gear train close to the generator side, the planet carrier of the hub-side planetary gear train and the planet carrier of the generator-side planetary gear train are bolted together through the inner ring of the main bearing to form a double-linked planet carrier, the planet carrier of the hub-side planetary gear train is connected to the hub, and the input power is transmitted from the double-linked planet carrier to the respective planetary gear trains In the power system; the generator side inner gear ring of the generator side planetary gear train is fixedly connected with the outer ring of the main bearing, the gear box body and the outer shell of the generator by bolts, the generator side sun gear of the generator side planetary gear train is connected with the hub side inner gear ring of the hub side planetary gear train by a connecting plate, and the hub side sun gear of the hub side planetary gear train is connected to the generator; the planet carrier input power of the generator side planetary gear train is transmitted to the hub side inner gear ring through its planetary gears and the generator side sun gear, is combined with the planetary gear power of the hub side planetary gear train, and is transmitted to the hub side sun gear, and finally the hub side sun gear transmits the power to the generator.

2. A compact semi-direct drive wind turbine gearbox power split transmission structure according to claim 1, characterized in that: Each planetary gear adopts a flexible pin structure for load balancing. The flexible pin structure consists of a flexible pin shaft and a pin sleeve. The flexible pin shaft has an interference fit with the planetary carrier. The pin sleeve has an interference fit with the flexible pin shaft and supports the planetary bearings and planetary gears. When two tangential forces from the inner ring and the sun gear are applied to the planetary gear, the angular deflection caused by the bending of the flexible pin shaft on the planetary carrier can be offset by the angular deflection caused by the bending of the pin sleeve from the other end of the flexible pin shaft in the opposite direction, so that each planetary gear floats in parallel, thereby evenly distributing the load between each planetary gear.

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