What type of pump is commonly featured in most pressure lubrication systems of 4-stroke engines?

In most pressure lubrication systems of four-stroke engines, the gerotor pump is widely used due to its efficiency and ability to maintain a consistent oil flow under varying engine loads and speeds. The gerotor design features an inner and outer gear, with the inner gear rotating within the outer gear, allowing for a compact construction that provides a positive displacement of oil.

This design is particularly effective for creating the necessary pressure to circulate oil throughout the engine, ensuring that all moving parts receive adequate lubrication to prevent wear and maintain proper function. The simplicity of the gerotor pump also contributes to its reliability and durability, making it suitable for the demanding environment of a running engine.

Other pump types, while they may have specific applications in different systems, do not offer the same combination of compact size, ease of use, and effective pressure generation as the gerotor pump in pressure lubrication systems.