Wind power main shaft adopts TIMKEN tapered roller bearing

The wind power main shaft is a transmission shaft that connects the wind wheel and the gear box, and is an important component for transmitting power. The performance of the main shaft has an important impact on the reliability and safety of the wind turbine. The TIMKEN tapered roller bearings used in the spindle support structure are becoming increasingly irreplaceable. There are three options for selection analysis, as follows:
1, TIMKEN double row tapered roller bearing + cylindrical roller bearing:
The more common combination of this type of solution is the NU/NNU cylindrical roller bearing plus double inner ring tapered roller bearing, and sometimes the NJ cylindrical roller bearing. Double-row tapered roller bearings generally do not distribute the load between the two rows of rollers. The force subjected to the external axial force is much larger, and the fatigue life is correspondingly much smaller. The appropriate reduction of the clearance can be To some extent, this situation is avoided. The taper angle of the TIMKEN tapered roller bearing used in this solution is generally small because the reduction of the taper angle in the same size can improve the radial load carrying capacity of the bearing. The span of the spindle support structure with this solution is equal to the distance between the floating end and the fixed end bearing.
2. Two TIMKEN single row tapered roller bearings:
Two single row tapered roller bearings are generally in a back-to-back arrangement, in which the length of the spindle is shorter than the first option and is therefore lower in cost from the first solution. In the selection design, it is generally recommended that the shaft hole adopt a large interference fit. If the spindle used is a hollow shaft, the interference should be appropriately adjusted according to the stress of the circumferential ring. It must be ensured that there is sufficient friction between the shaft and the inner ring and between the bearing housing and the outer ring to prevent relative movement.
Such a scheme is highly economical and has been widely used in foreign countries, but it is not widely used in China. The important reason is that many designers are worried that it is difficult to adjust the clearance after using this TIMKEN bearing. But as long as you have the right skills, you can overcome them.
3, TIMKEN super large double row tapered roller bearing program:
The biggest feature of this kind of solution is that the main shaft is very short. In order to improve the anti-overturning torque, the radial diameter of the bearing is very large and the taper angle is also very large. This solution effectively shortens the length of the main shaft, but the cost of the bearing itself is very high. The influence of the clamping force and the rigidity of the entire system must be taken into consideration when determining the bearing clearance. In order to improve performance, we generally recommend that the bearing work within the negative clearance range.
Different from the two solutions mentioned above, this solution often integrates many other components such as seals into the bearing. Therefore, in addition to the normal bearing fatigue life and stress calculation, it is necessary to lower the shaft under extreme conditions. The evaluation is performed at various locations, especially at the sealing location. In many cases, the bearing housing or the main shaft of this solution is replaced by bolts, which on the one hand makes the structure more compact, on the other hand completely eliminates the possibility of running the ring, but the bearing is analyzed to take into account the bolt for the bearing. Impact.https://www.supplyforever.com/

Bearing selection

The types, types and sizes of rolling bearings are varied.

In order for the mechanical device to perform as expected, it is essential to select the most suitable bearing.

In order to select a bearing, it is necessary to analyze a number of factors, to conduct research from various angles, and to evaluate the procedures for selecting a bearing. There are no special specifications, but the general order is as follows:

(1) Master the conditions of use of mechanical devices and bearings, etc.

(2) Clear requirements for bearings

(3) Type of selected bearing

(4) Selected bearing configuration

(5) Selected bearing size

(6) Selected bearing specifications

(7) How to install the selected bearing.

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