What is the purpose of a bearing housing?

A bearing housing serves to support the bearing and secure its outer ring, allowing only the inner ring to rotate while the outer ring remains stationary-maintaining alignment with the direction of transmission (such as in a motor) and ensuring balance. Conceptually, the bearing housing represents an assembly of the bearing and the casing, designed for ease of use. This configuration facilitates better fitment, offers greater convenience, and reduces manufacturing costs. As for its shape, there are many varieties; typically, it takes the form of a housing or casing designed to accommodate the bearing.