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The oil pump is used to force pressurized oil to the various parts of
the engine.
Gear and rotary pumps are the most common types of pumps. The gear
pump consists of a driven spur gear and a driving gear that is
attached to a shaft driven by the camshaft. The two gears are the
same size and fit snugly in the pump body. Oil is carried from the
inlet to the delivery side of the pump by the opposite teeth of both
gears. Here it is forced into the delivery pipe. It can't flow back,
because the space between the meshing gear teeth is too tight.
The rotary pump is driven by the camshaft. The inner rotor is shaped
like a cross with rounded points that fit into the star shape of the
outer rotor. The inner rotor is driven by a shaft turned by the
camshaft. When it turns, its rounded points "walk" around the star
shaped outer rotor and force the oil out to the delivery pipe.
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