What is a pitch bearing?

The pitch bearing is a kind of rolling bearing. The ball ball is installed in the middle of the inner
steel ring and the outer steel ring, and can bear a large load. Also called ball bearing. The
purpose of pitch bearings is to determine the relative position of two parts (usually the shaft and
the bearing seat) and ensure their free rotation, while transmitting the load between them. At
high speeds (eg in gyro ball bearings), this use can be expanded to include free rotation with little
wear in the bearings. In order to achieve this state, an adhesive fluid film called an elastic
hydrodynamic lubrication film can be used to separate the two parts of the bearing. Denhard
(1 966) pointed out that the elasticity can be maintained not only when the bearing bears the load
on the shaft, but also when the bearing is preloaded so that the positioning accuracy and stability
of the shaft do not exceed 1 microinch or 1 nanoinch Hydrodynamic lubricating film