The two rows of double row tapered roller bearings are simultaneously carried because:
1. Tapered roller bearings are pre-tightened, eliminating internal clearance
2. The pre-tightening increases the rigidity of the radial and axial directions, thereby reducing the deformation during operation. In the case of low-speed operation, the optimized load-bearing area applied to the wind power generator has a real benefit.
At low speeds, the rollers lose their adhesion and rolling speed when they exit the load zone, so they are pushed by the cage. When the rollers re-enter the load zone, they regain traction and rolling speed under load, and slide. Peeling off spots may occur. This slippage and spalling can further cause large areas of wear of the raceways and rollers at those points. At the same time, this will also have an adverse effect on the formation of oil film in the bearing zone.
In addition, this sliding and flaking causes a large raceway/roller secondary skin shear stress. This tensile stress, combined with tensile ring stress, residual heat treatment stress, and rolling contact stress, can cause premature axial crack formation. Even if there is enough oil film or extreme pressure additive to prevent metal and metal contact, the sliding of the roller can bring about the same large tensile stress.
The problems caused by speed, slip, slip and spalling are even worse in the case of grease lubrication. This is because the grease is more viscous and can impede rolling motion outside the load zone.
Figure 7: Load bearing area of ​​spherical roller bearings
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