CN209325000U - Power split planetary transmission structure of semi-direct drive wind power gearbox with offset gears on both sides - Google Patents

Abstract

The utility model discloses a semi-direct-drive wind-powered electricity generation gear box power split planetary transmission structure with offset gears on two sides, which comprises a hub side primary planetary gear train, a generator side secondary planetary gear train and a main bearing, wherein the main bearing is positioned between the hub side planetary gear and the generator side planetary gear, the inner ring of the main bearing is fixed, and the outer ring rotates and is connected with the hub side primary planetary gear and the hub into a whole by bolts; the gear box adopts a two-stage planetary differential power splitting structural form, input power is respectively input into respective planetary gear transmission from an inner gear ring of a hub side first-stage planetary gear train and a generator side second-stage planetary gear train, the input power ratio of the inner gear ring of the generator side second-stage planetary gear train and the generator side planetary gear train synthesize power, and the power is transmitted to the generator through a generator side second-stage sun gear. The utility model discloses change the position of former driving gear structure, adopt the power split form, for make full use of radial position space, can improve bearing capacity under same platform.

Description

Power split planetary transmission structure of semi-direct drive wind power gearbox with offset gears on both sides

technical field

The utility model relates to the technical field of wind power gear box transmission, in particular to a semi-direct drive wind power gear box power split planetary transmission structure with both sides of gears biased.

Background technique

As shown in Figure 1, it is a traditional compact semi-direct drive system for wind turbines. There are two stages of planetary transmission devices with a total ratio of about 25. The first stage of planetary transmission is located in the inner ring of the flange main bearing. The inner ring of the bearing rotates with the hub, the outer ring is fixed, and the outer ring is connected to the tower through the generator casing and elbow. When the flange main bearing is fixed, in the upgrading of products on the same platform, due to the limitation of the inner diameter of the flange main bearing, the improvement of the bearing capacity is restricted. In the figure, 01 is the flange main bearing, 02 is the primary planetary transmission, 03 is the secondary planetary transmission, 04 is the hub, 05 is the generator casing, 06 is the spline, and 07 is the output sun gear.

Utility model content

The purpose of this utility model is to overcome the deficiencies and shortcomings of the prior art, and propose a semi-direct drive wind power gearbox power split planetary transmission structure with offset gears on both sides, change the position of the original transmission gear structure, and adopt the power splitting form, Make full use of the radial position space and increase the bearing capacity under the same platform.

In order to achieve the above purpose, the technical solution provided by the utility model is: a semi-direct drive wind power gearbox with offset planetary transmission structure on both sides of the gear, including a hub-side primary planetary gear train on the hub side of the gearbox, The generator side secondary planetary gear train on the generator side of the gearbox and the main bearing adopting a single double-row flange main bearing structure, the main bearing is placed in the gearbox and located at the hub side of the primary planetary gear train Between the planetary wheel on the hub side and the planetary wheel on the generator side of the second-stage planetary gear train on the generator side, it is used to bear the force and bending moment load transmitted by the wind wheel and reduce the impact of alternating loads on the gearbox. The inner ring of the main bearing is fixed with the generator casing, and its outer ring rotates and is connected with the hub-side first-stage planetary carrier of the hub-side first-stage planetary gear train and the hub with bolts; the gearbox adopts two-stage planetary differential power In the split structure, the input power is input from the inner ring gear of the first-stage planetary gear train on the hub side and the second-stage planetary carrier on the generator side from the second-stage planetary gear train on the generator side respectively, and the input power of both is The ratios are different, the first-stage planetary carrier on the hub side is connected to the second-stage planetary carrier on the generator side through a spline shaft, the first-stage sun gear on the hub side of the first-stage planetary gear train on the hub side is connected to the second-stage planetary gear train on the generator side The inner ring gear connection of the first-stage planetary gear train on the hub side, the inner ring gear torque of the first-stage planetary gear train on the hub side passes through the planetary gears on the hub side, the first-stage sun gear on the hub side, and then is transmitted to the inner ring gear of the second-stage planetary gear train on the generator side. The generator side planetary gear synthesizes the power, and finally transmits the power to the generator through the generator side secondary sun gear of the generator side secondary planetary gear train.

Further, both the hub-side planetary gear and the generator-side planetary gear adopt a flexible pin structure to share the load, and the flexible pin structure is composed of a flexible pin shaft and a pin sleeve, and the flexible pin shaft interferes with the corresponding planet carrier Cooperate, the pin sleeve is interference fit with the flexible pin shaft, and supports the corresponding planetary bearings and planetary gears. When the two tangential forces of the ring gear and the sun gear are applied to the planetary gears, the The angular curvature caused by the bending of the flexible pin shaft can be offset by the angular winding 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 then the load is averaged between each planetary wheel distribute.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. A single double-row flange main bearing structure is adopted. The outer ring of the main bearing rotates and the inner ring is fixed, making the structure of the fan more compact.

2. The two-stage planetary differential power split structure is adopted, the gears are offset on both sides of the main bearing, the diameter of the two-stage planetary transmission gear is enlarged, and the power split is adopted at the same time, which improves the carrying capacity.

3. The two-stage planetary gear adopts a flexible pin structure, so that the planetary gear floats and loads evenly, so that the load of the multi-planetary gear system is more uniform, the transmission is more stable, and the service life is effectively improved.

4. Make full use of the radial position space of the gearbox, and effectively improve the power and carrying capacity under the same platform.

Description of drawings

Figure 1 is a schematic diagram of the transmission structure of a traditional semi-direct drive wind power gearbox.

Fig. 2 is a schematic diagram of the power split planetary transmission structure of the semi-direct drive wind power gearbox of the present invention.

Detailed ways

Below in conjunction with specific embodiment the utility model is further described.

Referring to Fig. 2, the semi-direct-drive wind power gearbox power split planetary transmission structure provided by this embodiment includes a hub-side primary planetary gear train located on the hub side of the gearbox, and a planetary gear train located on the gearbox hub side. The second-stage planetary gear train on the generator side and the main bearing 1 with a single double-row flange-type main bearing structure. The main bearing 1 is placed in the gearbox and located on the hub of the first-stage planetary gear train on the hub side. Between the side planetary gear 2 and the generator side planetary gear 3 of the second-stage planetary gear train on the generator side, it is used to bear loads such as force and bending moment transmitted by the wind wheel, and reduce the impact of alternating loads on the gearbox. Among them, The inner ring of the main bearing 1 is fixed together with the generator housing 4, and its outer ring rotates and is connected with the first-stage planet carrier 5 on the hub side of the first-stage planetary gear train on the hub side and the hub 6 with bolts, thus greatly utilizing The space is increased and the carrying capacity is improved; the gearbox adopts a two-stage planetary differential power splitting structure, and the input power is respectively from the inner ring gear 7 of the first-stage planetary gear train on the hub side and the generator side of the second-stage planetary gear train on the generator side. The secondary planetary carrier 8 is input into the respective planetary gear transmissions, and the input power ratios of the two are different. The primary planetary carrier 5 on the hub side is connected to the secondary planetary carrier 8 on the generator side through a spline shaft 9. The hub The hub-side first-stage sun gear 10 of the side-stage planetary gear train is connected to the inner ring gear 11 of the generator-side second-stage planetary gear train, and the torque of the inner ring gear 7 of the hub-side first-stage planetary gear train passes through the hub-side planetary gear. Wheel 2 and the first-stage sun gear 10 on the hub side are then transmitted to the inner ring gear 11 of the second-stage planetary gear train on the generator side, and the power is synthesized with the planetary gear 3 on the generator side, and finally the power is generated by the second-stage planetary gear train on the generator side The secondary sun gear 12 on the machine side transmits power to the generator. This structure allows the power of the hub 6 to be divided. The same power transmission can reduce the radial size of the gearbox, increase the power density of the gearbox, and ensure safety and reliability. improve.

In addition, both the hub-side planetary gear 2 and the generator-side planetary gear 3 adopt a flexible pin structure to share the load, and the flexible pin structure is composed of a flexible pin shaft 13 and a pin sleeve 14, and the flexible pin shaft 13 is corresponding to each The planet carrier interference fit, the pin sleeve 14 is interference fit with the flexible pin shaft 13, and supports the corresponding planetary bearings and planetary gears, when the two tangential forces of the ring gear and the sun gear are applied to the planetary gears When , the angular winding caused by the bending of the flexible pin shaft on the planet carrier can be offset by the angular winding caused by the bending of the pin bushing from the other end of the flexible pin shaft in the opposite direction, so that each planetary wheel floats in parallel, and then the load in Evenly distributed between each planetary wheel.

The implementation examples described above are only preferred embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model, so all changes made according to the shape and principle of the present utility model should be covered by the scope of the present utility model. within the scope of protection.

Claims (2)

1. The power split planetary transmission structure of the semi-direct drive wind power gearbox with offset gears on both sides, which is characterized in that it includes a first-stage planetary gear train on the hub side of the gearbox and a generator on the generator side of the gearbox. The second-stage planetary gear train on the hub side and the main bearing with a single double-row flange-type main bearing structure. Between the planetary wheels on the generator side of the stage planetary gear train, it is used to bear the force and bending moment load transmitted by the wind wheel, and reduce the impact of the alternating load on the gearbox, wherein the inner ring of the main bearing and the generator casing Fixed together, its outer ring rotates and is connected with the first-stage planetary carrier on the hub side of the first-stage planetary gear train on the hub side and the hub with bolts; the gearbox adopts a two-stage planetary differential power splitting structure, and the input power is respectively from the hub The inner ring gear of the first-stage planetary gear train on the side and the second-stage planet carrier on the generator side of the second-stage planetary gear train on the generator side are input into their respective planetary gear transmissions, and the input power ratios of the two are different. The first-stage planetary gear on the hub side The planetary carrier is connected to the second-stage planetary carrier on the generator side through a spline shaft, and the first-stage sun gear on the hub side of the first-stage planetary gear train on the hub side is connected to the inner ring gear of the second-stage planetary gear train on the generator side. The torque of the inner ring gear of the first-stage planetary gear train on the side is transmitted to the inner ring gear of the second-stage planetary gear train on the generator side through the planetary gear on the hub side and the first-stage sun gear on the hub side, and combines power with the planetary gear on the generator side. Finally, the power is transmitted to the generator through the generator-side secondary sun gear of the generator-side secondary planetary gear train. 2. The semi-direct-drive wind power gearbox power split planetary transmission structure with biased gears on both sides according to claim 1, characterized in that: both the hub-side planetary gear and the generator-side planetary gear adopt a flexible pin structure to balance The flexible pin structure is composed of flexible pin shafts and pin sleeves, the flexible pin shafts are interference fit with their corresponding planet carriers, and the pin sleeves are interference fit with the flexible pin shafts and support their corresponding planetary bearings And the planetary gear, when the two tangential forces of the ring gear and the sun gear are applied to the planetary gear, the angular rotation caused by the bending of the flexible pin shaft on the planet carrier can be reversed by the pin at the other end of the flexible pin shaft The angular rotation caused by the bending of the bushing cancels out, so that each planetary wheel floats in parallel, so that the load is evenly distributed between each planetary wheel.