Why is a gear type oil pump used more commonly than a plunger type in diesel engines?
Gear type offers continuous and reliable flow
A gear-type oil pump has two meshing gears that trap oil between their teeth and the housing and carry it around continuously.
This gives a steady, pulsation-free flow at a nearly constant rate over a wide speed range, which is exactly what an engine lubrication system needs.
A plunger (reciprocating) pump delivers oil in pulses and is more complex for this duty, so it is less commonly used for the main oil pump.
Hence, the gear type is preferred because it offers continuous and reliable flow.
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