CN211287975U - Double-main-bearing transmission device and arrangement structure of double-fed wind turbine generator - Google Patents

Abstract

The utility model discloses a double main bearing transmission device and an arrangement structure of a double-fed wind turbine generator, which comprises a main shaft, wherein one end of the main shaft is connected with a hub, the other end of the main shaft is connected with a gear box, a front main bearing assembly and a rear main bearing assembly are sequentially arranged on the outer side of the main shaft from the hub to the direction of the gear box, the front main bearing assembly comprises a front main bearing and a front main bearing seat, and the rear main bearing assembly comprises a rear main bearing and a rear; the front main bearing assembly and the rear main bearing assembly are arranged in a clearance mode; at least one end wall of the front main bearing seat is provided with a front oil collecting tray and a front oil discharge pipe, and at least one end wall of the rear main bearing seat is provided with a rear oil collecting tray and a rear oil discharge pipe; the diameter of a main shaft cylindrical surface where the front main bearing assembly is located is larger than that of a main shaft cylindrical surface where the rear main bearing assembly is located, and a conical surface is arranged on a main shaft between the front main bearing assembly and the rear main bearing assembly; the rear end of the rear main bearing assembly is provided with a locking piece. The utility model has the advantages of improve the gear box and bear the load, convenient assembling dispels the heat soon.

Description

Double-main-bearing transmission device and arrangement structure of double-fed wind turbine generator

Technical Field

The utility model relates to a wind turbine generator system bearing transmission equipment technical field especially relates to a two base bearing transmission of double-fed wind turbine generator system and arrangement structure.

Background

The double-fed asynchronous wind driven generator is the most widely applied wind driven generator at present and consists of a wound-rotor asynchronous generator with a stator winding directly connected with a fixed-frequency three-phase power grid and a bidirectional back-to-back IGBT voltage source converter arranged on a rotor winding. In the double-fed wind generating set, a main shaft assembly is a core component for connecting a gear box and a hub, the performance of the main shaft assembly directly influences the running reliability of a fan, and the main bearing is ensured to work normally. The existing wind generating set and the double-fed wind generating set with a single main bearing have poor integral rigidity, complex gear box loading and more faults.

The prior art dual main bearings typically employ electrically insulated deep groove ball bearings and cylindrical roller bearings to withstand radial and axial forces. For example, the chinese patent document entitled "a bearing structure of a doubly-fed wind turbine" with an authorization publication number of CN203352353U and an authorization publication date of 2013, 12 and 18 discloses a bearing structure of a doubly-fed wind turbine having a large bearing capacity, a good protection performance, and no oil leakage, which includes a rolling bearing, a bearing housing, a bearing inner cover, a bearing outer cover, a pre-tightening mechanism, a positioning and sealing mechanism, and a waste oil collecting mechanism. The inner ring of the rolling bearing is fixedly sleeved on the rotating shaft of the generator; the bearing sleeve is sleeved on the outer ring of the rolling bearing through a bush; the bearing inner cover is fixed on the inner side surface of the bearing sleeve, and a labyrinth groove is arranged on the inner circular surface of the bearing inner cover; the bearing outer cover is fixed on the outer side surface of the bearing sleeve; the pre-tightening force mechanism comprises a compression spring which is arranged in a blind hole of the outer cover of the bearing and is propped against the outer side surface of the outer ring of the rolling bearing; the positioning sealing mechanism comprises an oil thrower disc, a stop washer, a fastening nut, a labyrinth ring and an elastic retainer ring which are arranged on the outer side of the rolling bearing in sequence; the waste oil collecting mechanism comprises an oil discharging box and an oil guiding pipe, the oil discharging box is fixed on an oil outlet of the outer bearing cover, and the oil guiding pipe is connected to the oil discharging box and guided out of a machine base of the generator. The bearing sleeve is sleeved on the outer rings of the common deep groove ball bearing and the cylindrical roller bearing through a bushing. The disadvantages are that: 1. the deep groove ball bearing and the cylindrical roller bearing are fixed on the same bearing sleeve, the bearing sleeve needs to bear radial force and axial force at the same time, and the stress of the deep groove ball bearing and the cylindrical roller bearing can interfere with each other to influence the service life of a main shaft transmission and the service life of the bearing and a gear box; 2. waste oil between the deep groove ball bearing and the cylindrical roller bearing is difficult to discharge, the heat dissipation performance between the bearings is easily affected, high-temperature faults are caused, and the service life of the bearings is affected.

Therefore, it is necessary to design a double-main-bearing transmission device and an arrangement structure of the large double-fed wind turbine generator, which can increase the system rigidity and improve the load of a gear box.

Disclosure of Invention

The utility model discloses it is poor to overcome the whole rigidity of double-fed wind turbine generator system among the prior art, and the gear box bears the load complicacy, causes the not enough of double-fed wind turbine generator system main shaft drive damage easily, provides a double-fed wind turbine generator system two main bearing transmission and arrangement structure, can bear the radial force and the axial force of main shaft transmission through the bearing of difference, improves the gear box and bears the load condition, extension transmission's life.

The utility model discloses a second of the utility model purpose can assist the waste oil fat of dispersion on the oil catch tray, makes the oil catch tray can collect more grease, promotes the waste oil fat of high temperature and flows, strengthens the radiating effect.

In order to achieve the above purpose, the present invention adopts the following technical solution.

A double main bearing transmission device of a double-fed wind turbine generator comprises a main shaft, wherein one end of the main shaft is connected with a hub, the other end of the main shaft is connected with a gear box, a front main bearing assembly and a rear main bearing assembly are sequentially arranged on the outer side of the main shaft from the hub to the gear box, the front main bearing assembly comprises a front main bearing and a front main bearing seat, and the rear main bearing assembly comprises a rear main bearing and a rear main bearing seat; the front main bearing assembly and the rear main bearing assembly are arranged in a clearance mode; at least one end wall of the front main bearing seat is provided with a front oil collecting tray and a front oil discharge pipe which can extend out of the front oil collecting tray, and at least one end wall of the rear main bearing seat is provided with a rear oil collecting tray and a rear oil discharge pipe which can extend out of the rear oil collecting tray; the diameter of a main shaft cylindrical surface where the front main bearing assembly is located is larger than that of a main shaft cylindrical surface where the rear main bearing assembly is located, and a transitional conical surface is arranged on a main shaft between the front main bearing assembly and the rear main bearing assembly; the rear end of the rear main bearing assembly is provided with a locking member capable of blocking the rear main bearing assembly.

The diameter of the main shaft where the front main bearing assembly is located is larger than that of the main shaft where the rear main bearing assembly is located, so that the center of gravity of the main shaft moves forwards, the distance between the center of gravity of the main shaft and the front main bearing assembly is reduced, the front main bearing can intensively bear radial pressure caused by the main shaft, the reliability of separate bearing of radial force and axial force is improved, and the running stability of a transmission device is improved; the minimum radial dimension of the front main bearing assembly is larger than that of the rear main bearing assembly, so that the front main bearing assembly and the rear main bearing assembly can be conveniently installed on the main shaft, and the assembly efficiency is improved; meanwhile, the front main bearing assembly has larger radial size and larger pressure distribution surface of the inner bearing, and can assist in improving the stability of the front main bearing assembly; the locking piece can lock the rear bearing assembly, limit the axial displacement of the rear bearing assembly and improve the transmission stability of the main shaft; the front oil discharge pipe and the rear oil discharge pipe respectively discharge high-temperature waste oil caused by bearing abrasion, and the waste oil is gathered and flows in the oil collecting tray, so that the stability of bearing movement is guaranteed, and the heat dissipation inside the bearing is facilitated.

Preferably, a plurality of spoilers are arranged in the front oil collecting tray and the rear oil collecting tray at equal intervals, the outer ends of the spoilers are opposite to the main shaft, and a separation gap is arranged between each spoiler and the main shaft. When the main shaft rotates, wind pressure is generated on the side surface of the main shaft to drive the outer end of the spoiler to vibrate, and the high-temperature waste oil is disturbed by the spoiler, so that the heat dissipation of the high-temperature waste oil discharged from the bearing seat is accelerated; the oil can be separated in an auxiliary manner, and the oil at the oil discharge pipe opening in the oil collecting tray is prevented from being accumulated and overflowing; the isolation joint can prevent the turbulence strips from rubbing with the main shaft, can ensure the reliability of the disturbance of the main shaft rotation to the turbulence strips, and can prevent waste grease from flowing to the side face of the main shaft through the turbulence plates.

Preferably, the spoiler is arranged along the radial direction of the oil collecting tray, and a fixing plate connected with the inner side of the front oil collecting tray or the inner side of the rear oil collecting tray is arranged on the spoiler. The spoiler is convenient to install.

Preferably, the spoiler comprises a connecting rod fixed in the front oil collecting tray or the rear oil collecting tray and a plurality of disturbance strips positioned at the outer end of the connecting rod; a backflow cover which is covered outside the connecting rod is arranged between the connecting rod and the disturbance strip. The disturbance strips respond to the change of the wind pressure outside the main shaft, so that the wind pressure can be dispersed, and the overlarge vibration amplitude of the spoiler is prevented; the backflow cover blocks the connecting rod, waste oil and fat can be prevented from flowing to the side face of the main shaft along the spoiler, and cleanliness in the engine room is guaranteed.

Preferably, the locking piece is a locking nut, the main shaft is provided with a thread matched with the locking nut, and the rear end of the thread of the main shaft is provided with an inwards concave arc groove. The locking part is convenient to install, and the locking effect of the locking part is reliable.

Preferably, the front main bearing and the rear main bearing both adopt double-row spherical self-aligning roller bearings, and the clearance of the front main bearing is larger than that of the rear main bearing. The front bearing bears radial force, the rear bearing bears axial force, the main shaft can be better supported, and the support stability is high.

Preferably, the main shaft is provided with a through hole along the length direction thereof. The heat dissipation performance of the main shaft is improved, the overall quality of the main shaft is reduced, and the service life of the transmission device is prolonged.

An arrangement structure based on the double-main-bearing transmission device of the double-fed wind turbine generator comprises a tower barrel, a cabin arranged at the top of the tower barrel, a hub and blades arranged on the hub, wherein the hub is positioned at the front end of the cabin, and a generator, a gear box and a main shaft assembly are sequentially arranged in the cabin from back to front; characterized in that the spindle assembly comprises the transmission device of any one of the above.

The utility model discloses an useful part lies in: the radial force and the axial force transmitted by the main shaft can be borne by different bearings, the loading condition of the gear box is improved, and the service life of the transmission device is prolonged; the heat dissipation of the high-temperature waste grease discharged from the bearing seat can be accelerated; the oil can be separated in an auxiliary manner, and the oil at the oil discharge pipe opening in the oil collecting tray is prevented from being accumulated and overflowing; the transmission device outside the main shaft is convenient to assemble and high in assembly efficiency.

Drawings

Fig. 1 is a schematic structural diagram of the wind turbine generator of the present invention.

Fig. 2 is a schematic structural diagram of the spindle assembly and the gear box of the present invention.

Fig. 3 is a cross-sectional view of the transmission of the present invention.

Fig. 4 is an enlarged view at a in fig. 3.

Fig. 5 is an enlarged view at B in fig. 3.

Fig. 6 is a schematic structural view of a single front bearing seal pressing plate used in the present invention.

Fig. 7 is a schematic view of the cooperation between the front oil collecting tray and the main shaft of the present invention.

Fig. 8 is an enlarged schematic view at C in fig. 7.

In the figure: 1. a nacelle; 2. a generator; 3. a gear case;

a spindle assembly 4;

41. a front main bearing assembly; 411. a front main bearing block; 412. a rear end cap A; 413. a front bearing seal pressure plate; 414. a front bearing seal ring; 415. a rear retainer ring A; 416. a front retainer ring A; 417. a front end cover A; 418. a front main bearing;

43. a rear main bearing assembly; 431. a rear main bearing seat; 432. a rear end cover B; 433. a rear bearing seal pressure plate; 434. a rear bearing seal ring; 435. a rear retainer ring B; 436. a front retainer ring B; 437. a front end cover B; 438. locking the nut; 439. a rear main bearing;

42. a main shaft; 421. a through hole;

441. an oil discharge pipe; 442. a front oil collecting tray; 444, a rear oil collecting pan;

45. a spoiler; 451. a connecting plate; 452. disturbance strips; 46. a flow-back cover; 47. a fixing plate; 471. supporting a set square;

5. a blade; 6. a hub; 7. a tower drum.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

Example (c);

in fig. 1 to 8, a double main bearing transmission device of a doubly-fed wind turbine generator comprises a main shaft 42, wherein a through hole 421 is formed in the main shaft 42 along the length direction of the main shaft, and the through hole 421 can accelerate heat dissipation of the main shaft 42 and complete light-weight design of the main shaft 42. One end of the main shaft 42 is connected with the hub 6, the blades 5 are arranged on the hub 6, the other end of the main shaft 42 is connected with the gear box 3, and a front main bearing assembly 41 and a rear main bearing assembly 43 are sequentially arranged on the outer side of the main shaft 42 from the hub 6 to the gear box 3. Front main bearing assembly 41 and rear main bearing assembly 43 are disposed in clearance; the diameter of the cylindrical surface of main shaft 42 where front main bearing assembly 41 is located is larger than the diameter of the cylindrical surface of main shaft 42 where rear main bearing assembly 43 is located, and main shaft 42 between front main bearing assembly 41 and rear main bearing assembly 43 is provided with a transitional conical surface. The front main bearing assembly 41 comprises a front main bearing 418 and a front main bearing seat 411, a front step part matched with the front main bearing 418 is arranged on the side surface of the main shaft 42, a front retaining ring A416 and a rear retaining ring A415 are respectively arranged at the front end and the rear end of the front main bearing 418, and a shaft shoulder matched with the front step part is arranged on the front retaining ring A416; a front end cover A417 and a rear end cover A412 are respectively arranged at the front end and the rear end of the front main bearing seat 411, a front bearing sealing ring 414 is arranged between the front retaining ring A416 and the front end cover A417, a front bearing sealing ring 414 is also arranged between the rear retaining ring A415 and the rear end cover A412, and a front bearing sealing pressing plate 413 capable of pressing the front bearing sealing ring 414 is respectively fixedly arranged outside the front end cover A417 and the rear end cover A412.

Rear main bearing assembly 43 includes a rear main bearing 439 and a rear main bearing housing 431; a rear step part matched with the rear main bearing 439 is arranged on the side surface of the main shaft 42, a front retainer ring B436 and a rear retainer ring B435 are respectively arranged at the front end and the rear end of the rear main bearing 439, and a shaft shoulder matched with the rear step part is arranged on the front end ring B; a front end cover B437 and a rear end cover B432 are respectively arranged at the front end and the rear end of the rear main bearing seat 431, a rear bearing sealing ring 434 is arranged between the front retaining ring B436 and the front end cover B437, a rear bearing sealing ring 434 is also arranged between the rear retaining ring B435 and the rear end cover B432, and a rear bearing sealing pressing plate 433 capable of pressing the rear bearing sealing ring 434 is respectively fixedly arranged outside the front end cover B437 and the rear end cover B432. The front bearing sealing pressure plate 413 and the rear bearing sealing pressure plate 433 are both of a segmented structure. Fig. 6 is a schematic diagram showing the structure of a front bearing sealing pressure plate 413 or a rear bearing sealing pressure plate 433 which is divided into four segments, each segment occupying a central angle of 90 degrees. The side surfaces of the front bearing sealing pressing plate 413 and the rear bearing sealing pressing plate 433 are respectively provided with screw mounting holes at uniform intervals, the front bearing sealing pressing plate 413 and the rear end cover A412 are fixed through screws, and the rear bearing sealing pressing plate 433 and the rear end cover B432 are fixed through screws. The front main bearing 418 and the rear main bearing 439 both adopt double-row spherical self-aligning roller bearings, and the clearance of the front main bearing 418 is larger than that of the rear main bearing 439. A front oil collecting tray 442 and a front oil drain pipe 441 capable of extending out of the front oil collecting tray 442 are provided on a rear side end wall of the front main bearing housing 411, and a rear oil collecting tray 444 and a rear oil drain pipe 441 capable of extending out of the rear oil collecting tray 444 are provided on a rear side end wall of the rear main bearing housing 431. Three spoilers 45 are respectively arranged in the front oil collecting tray 442 and the rear oil collecting tray 444 at equal intervals, and the outer ends of the spoilers 45 in the front oil collecting tray 442 are opposite to the main shaft 42; since the spoiler 45 is opposed to the lock nut 438 in the rear oil pan, the separation slit is located between the outer end of the spoiler 45 and the lock nut 438. A separation slit is arranged between the spoiler 45 and the main shaft 42. The spoiler 45 is arranged along the radial direction of the oil collecting tray, and the fixing plate 47 connected with the inner side of the front oil collecting tray 442 or the rear oil collecting tray 444 is arranged on the spoiler 45. The spoiler 45 comprises a connecting rod 451 fixed in the front oil collecting tray 442 or the rear oil collecting tray 444 and a plurality of disturbance strips 452 positioned at the outer ends of the connecting rod 451; a return cover 46 covering the outside of the connecting rod 451 is arranged between the connecting rod 451 and the disturbance strip 452. The return shroud 46 is hemispherical in shape, and the axis of the return shroud 46 coincides with the longitudinal axis of the spoiler 45. The spoiler 45 can be made of high-temperature-resistant rubber materials, so that the radial vertical state of the spoiler 45 is reliable, the flexibility of the spoiler 45 can be guaranteed, and the spoiler 45 can vibrate and disturb high-temperature waste oil in the oil collecting tray conveniently. The width of the spoiler 45 is half of the width of the oil collecting tray, so that the grease can flow conveniently.

The fixing plate 47 is connected with the inner wall of the oil collecting tray through screws. A supporting triangle 471 is arranged between the two sides of the spoiler 45 and the fixing plate 47, and a locking member capable of blocking the rear main bearing assembly 43 is arranged at the rear end of the rear main bearing assembly 43. The locking piece is a locking nut 438, a thread matched with the locking nut 438 is arranged on the main shaft 42, and an inwards concave arc groove is formed in the rear end of the thread of the main shaft 42. The retaining member can also use a compression expansion sleeve, the side surface of the main shaft 42 is compressed by the compression expansion sleeve, and compared with the locking nut 438, the compression expansion sleeve is adopted without arranging threads on the main shaft 42, so that the strength of the main shaft 42 is favorable for being good.

When the main shaft assembly is assembled, the main shaft 42 is hoisted, and the large end of the main shaft 42 is downwards placed on the chassis; the front spindle 42 assembly is then installed: firstly, sleeving a front bearing sealing ring 414 into a main shaft 42, heating a front retaining ring A416 to T1 ℃, then quickly sleeving the front retaining ring A416 into the main shaft 42, dropping the front retaining ring A416 to a front step part of the shaft body of the main shaft 42, hoisting a front end cover A417 to be placed on a supporting block of the front retaining ring A416, quickly sleeving the heated front main bearing 418 into the main shaft 42, dropping an inner ring of the main shaft 42 onto the front retaining ring A416, leveling inner and outer rings of a front main bearing 418, quickly sleeving a heated front main bearing seat 411 into the front main bearing 418, dropping the front main bearing seat 411 onto an outer ring of the front main bearing 418, cooling the front main bearing seat 411, a front bearing sealing ring 414, a front end cover A417 and a front bearing sealing pressure plate 413 are installed, the front main bearing 418 is then filled with oil grease, the rear end cap a412 and rear retainer a415 are installed, a front bearing sealing ring 414 is arranged between the rear end cover A412 and the rear retainer ring A415, a front bearing sealing pressing plate 413 is fixed through screws, and the front bearing sealing pressing plate 413 and the rear end cover press the front bearing sealing ring 414; the rear main bearing assembly 43 is then installed: firstly, sleeving a rear bearing seal ring 434 into a main shaft 42, heating a front retaining ring B436 to T1 ℃, then quickly sleeving the front retaining ring B436 into the main shaft 42, enabling the front retaining ring B436 to fall to a rear step part of a shaft body of the main shaft 42, hoisting a front end cover B437 to be placed on a supporting block of the front retaining ring B436, quickly sleeving a heated rear main bearing 439 into the main shaft 42, enabling an inner ring of the main shaft 42 to fall on the front retaining ring B436, leveling inner and outer rings of the rear main bearing 439, quickly sleeving a heated rear main bearing seat 431 into the rear main bearing 439, enabling the rear main bearing seat 431 to fall on an outer ring of the rear main bearing 439, cooling the rear main bearing seat 431, a rear bearing sealing ring 434, a front end cover B437 and a rear bearing sealing pressure plate 433 are arranged, the rear main bearing 439 is then filled with oil grease, the rear end cap B432 and the rear retainer B435 are installed, a rear bearing seal ring 434 is arranged between the rear end cover B432 and the rear retainer ring B435, a rear bearing seal pressing plate 433 is fixed through screws, and the rear bearing seal pressing plate 433 and the rear end cover B432 tightly press the rear bearing seal ring 434;

and finally, installing a locking piece: after the installation, a locking nut 438 or a compression expansion sleeve is installed on the rear side of the rear retainer ring B435, and the installation is finished.

The front oil collecting tray 442 with the spoiler 45 pre-installed is attached to the side surface of the front main shaft bearing 411, a fixing plane attached to the front main shaft bearing 411 is arranged on the side surface of the front oil collecting tray 442, and the fixing plane and the front main shaft bearing 411 are fixed through screws.

The rear oil collecting disc 444 with the spoiler 45 pre-installed is fixedly connected into the rear main bearing seat 431 through screws, a fixing plane attached to the rear main bearing seat 431 is arranged on the outer side of the rear oil collecting disc 444, and the fixing plane and the rear main shaft 42 seat are fixed through screws.

The embodiment of the utility model also provides an arrangement structure based on above-mentioned double main bearing transmission pivot of double-fed wind turbine generator system, including a tower section of thick bamboo 7, install cabin 1, wheel hub 6 and the blade 5 of installing on wheel hub 6 at the tower section of thick bamboo top, wheel hub 6 is located the front end of cabin 1, is equipped with generator 2, gear box 3 and main shaft assembly 4 from the back forward in cabin 1 in proper order; the spindle assembly 4 includes a transmission as described in any one of the above. The radial force and the axial force transmitted by the main shaft can be borne by different bearings, the loading condition of the gear box 3 is improved, and the service life of the transmission device is prolonged.

Claims (8)

1. A double main bearing transmission device of a double-fed wind turbine generator comprises a main shaft, wherein one end of the main shaft is connected with a hub, the other end of the main shaft is connected with a gear box, a front main bearing assembly and a rear main bearing assembly are sequentially arranged on the outer side of the main shaft from the hub to the gear box, the front main bearing assembly comprises a front main bearing and a front main bearing seat, and the rear main bearing assembly comprises a rear main bearing and a rear main bearing seat; the front main bearing assembly and the rear main bearing assembly are arranged in a clearance mode; at least one end wall of the front main bearing seat is provided with a front oil collecting tray and a front oil discharge pipe which can extend out of the front oil collecting tray, and at least one end wall of the rear main bearing seat is provided with a rear oil collecting tray and a rear oil discharge pipe which can extend out of the rear oil collecting tray; the diameter of a main shaft cylindrical surface where the front main bearing assembly is located is larger than that of a main shaft cylindrical surface where the rear main bearing assembly is located, and a transitional conical surface is arranged on a main shaft between the front main bearing assembly and the rear main bearing assembly; the rear end of the rear main bearing assembly is provided with a locking member capable of blocking the rear main bearing assembly.

2. The transmission device of claim 1, wherein a plurality of spoilers are respectively arranged in the front oil collecting tray and the rear oil collecting tray at equal intervals, the outer ends of the spoilers are opposite to the main shaft, and an isolation gap is arranged between each spoiler and the main shaft.

3. The double main bearing transmission device of the doubly-fed wind turbine generator as claimed in claim 2, wherein the spoiler is arranged along the radial direction of the oil collecting tray, and the spoiler is provided with a fixing plate connected with the inner side of the front oil collecting tray or the inner side of the rear oil collecting tray.

4. The double-main-bearing transmission device of the doubly-fed wind turbine generator set as claimed in claim 2 or 3, wherein the spoiler comprises a connecting rod fixed in the front oil collecting tray or the rear oil collecting tray and a plurality of disturbance bars positioned at the outer end of the connecting rod; a backflow cover which is covered outside the connecting rod is arranged between the connecting rod and the disturbance strip.

5. The double-main-bearing transmission device of the doubly-fed wind turbine generator set as claimed in claim 1, wherein the locking member is a locking nut, the main shaft is provided with a thread matching with the locking nut, and the main shaft is provided with an inward concave arc groove at the rear end of the thread.

6. The double-main-bearing transmission device of the double-fed wind turbine generator set according to claim 1, wherein the front main bearing and the rear main bearing both adopt double-row spherical self-aligning roller bearings, and the clearance of the front main bearing is larger than that of the rear main bearing.

7. The transmission device for the double main bearings of the doubly-fed wind turbine generator set as claimed in claim 1, wherein a through hole is formed in the main shaft along the length direction of the main shaft.

8. An arrangement structure of a double-fed wind turbine generator double main bearing transmission device based on any one of the claims 1 to 7 comprises a tower, a nacelle mounted on the top of the tower, a hub and blades mounted on the hub, wherein the hub is located at the front end of the nacelle, and a generator, a gearbox and a main shaft assembly are sequentially arranged in the nacelle from back to front; characterised in that the spindle assembly includes a transmission as claimed in any one of claims 1 to 7.

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