Supply NTN bearing 30309D

Bearing () is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body to reduce the friction coefficient (r) during its movement and ensure its rotation accuracy (r).
d= According to the different friction properties of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings, their radial size, vibration and noise are larger and the price is higher.
d= Rolling bearings generally consist of four parts: outer ring, inner ring, rolling elements and cage. Strictly speaking, they consist of six major parts: outer ring, inner ring, rolling elements, cage, seal and lubricating oil. Simply put, as long as it has an outer ring, an inner ring, and rolling elements, it can be defined as a rolling bearing. Rolling bearings are divided into two categories: ball bearings and roller bearings according to the shape of the rolling elements.