Final answer:
Ring oiled sleeve bearings are common in pumps and motors for their capability to self-lubricate and reduce friction between rotating shafts and stationary parts.
Step-by-step explanation:
The type of bearing that is quite common on pump and motor bearings is the ring oiled sleeve bearing. Sleeve bearings, also known as bushings, are simple bearings used to reduce friction between rotating shafts and stationary support members. In pumps and motors, a ring oiled sleeve bearing consists of a rotating ring that dips into a reservoir of lubricant. As the ring rotates, it carries lubricant onto the shaft, which then spreads across the surface of the bearing to reduce wear and friction. This self-contained oiling method is effective and widely used in various industrial applications.