What type of load is grease primarily used to lubricate at low to moderate shaft speeds?

Grease is primarily used to lubricate heavy loads at low to moderate shaft speeds due to its ability to provide a thick, protective film between moving parts. Heavy loads create significant pressure on bearing surfaces, and grease's viscosity allows it to maintain a lubricating film under these conditions, preventing wear and reducing friction. Grease is formulated to adhere to surfaces, which is particularly beneficial in applications where lubrication retention is crucial, such as in heavy machinery where loads may fluctuate.

In contrast, other types of loads, such as radial or thrust loads, may require different lubrication strategies or types of lubricants, like oil or specialized lubricants better suited for high-speed applications. While grease can be used in those situations, it is not the primary choice due to its distinct characteristics and the specific demands of varying load types. Understanding these distinctions is key to applying lubrication effectively in mechanical systems.