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The oil pump's main job is to provide engine oil to the bearings, pistons, and camshaft under pressure. This lubricates these systems, allows larger fluid bearings to be used, and aids in engine cooling.

There are three basic types of oil pumps:

1.Twin gear pumps

           Twin gear pumps (also known as external pumps) are located within the gear oil pan on the bottom of the engine and use a pair of intermeshing gears to pump oil. One gear is driven by a shaft, while the first gear is driven by the second gear. The pump is usually driven by a shaft linked to the crankshaft, camshaft, or lubricant distributor shaft. As a result, the pump spins at half the speed of the engine. Pump gears revolve in a clockwise and counter clockwise motion. This catches hydraulic oil between the gear teeth and transfers it around the outside of each gear from the pickup tube entry to the pump outlet.

2.Rotor Pumps

In rotor pumps, an inner gear circulates within an outer rotor (also known as "gerotor" pumps). The inner gear has one fewer lobe than the outer rotor. The outer rotor is likewise slightly off-centre in relation to the inner gear, causing it to spin at around 80% of the inner gear's speed. This causes a bellows-like pumping action, sucking oil from the input port and pushing it out the output port.

3.Front engine cover oil pumps

Front engine cover oil pumps (also known as internal/external pumps) are usually located in the front engine cover. This is a rotor pump with an inner driving gear and an outer rotor, but the inner industrial gear lubricants is connected to the crankshaft directly. The direct drive method eliminates the need for a separate pump drive shaft. This pump creates more pressure at idle than a camshaft or distributor-driven pump because it revolves at the same speed as the engine (which only turns at half engine speed).

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