風機主軸是連接風機風翅與風機底座的重要部件，風機主軸是中空的，風機主軸的材質是不銹鋼的，內孔加工比較困難，對風機主軸的加工設備是深孔鉆鏜床，根據(jù)風機主軸的特性，深孔鉆鏜床要加高床頭。風力發(fā)電機的主軸既有徑向偏移，又有軸向偏移。實際上，主軸的軸向偏移直接傳遞到齒輪箱的輸入軸。除非對調心滾子軸承的徑向游隙，軸向游隙控制以及行星輪的定位做特別處理，否則軸向的偏移會對齒輪箱里行星架支撐軸承產(chǎn)生不利的影響。

主軸的軸向偏移取決于系統(tǒng)的剛性和固定端軸承的內部游隙。在固定端使用預緊的雙列圓錐滾子軸承后，主軸右端的軸向偏移幾乎比使用調心滾子軸承時減少4倍。減小軸向偏移可以減小軸向擠壓齒輪箱輸入軸的風險，這非常重要。

在一端固定、一端浮動的軸承布置情況下，固定端軸承（雙列圓錐滾子軸承或調心滾子軸承）同時承受徑向力和軸向力，而浮動端軸承（圓柱滾子軸承或調心滾子軸承）只承受徑向力。因為軸向力作用方向是從轉子端指向齒輪箱端的，因此不管是使用雙列圓錐滾子軸承還是使用調心滾子軸承，只有靠近齒輪箱一端的一列滾子承受所有的軸向力。

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The main shaft of the fan is an important part connecting the fan wing and the fan base. The main shaft of the fan is hollow. The material of the main shaft of the fan is stainless steel. The machining of the inner hole is difficult. The processing equipment for the main shaft of the fan is a deep hole drilling and boring machine. Characteristics, deep hole drilling and boring machine to increase the bed. The main shaft of a wind turbine has both a radial offset and an axial offset. In fact, the axial offset of the spindle is transmitted directly to the input shaft of the gearbox. Unless the radial clearance of the spherical roller bearing, the axial clearance control and the positioning of the planet gear are specially treated, the axial offset will adversely affect the planet carrier support bearing in the gearbox.

The axial offset of the spindle depends on the rigidity of the system and the internal clearance of the fixed end bearing. When a pre-tightened double row tapered roller bearing is used at the fixed end, the axial offset at the right end of the spindle is almost four times less than when using a spherical roller bearing. Reducing the axial offset reduces the risk of axially squeezing the input shaft of the gearbox, which is very important.

In the case of a bearing arrangement with one end fixed and one end floating, the fixed end bearing (double row tapered roller bearing or spherical roller bearing) is subjected to both radial and axial forces, while the floating end bearing (cylindrical roller bearing or tune) Heart roller bearings) only withstand radial forces. Since the axial force is directed from the rotor end to the gearbox end, whether a double row tapered roller bearing or a spherical roller bearing is used, only one row of rollers near one end of the gearbox is subjected to all axial forces.